U.S. patent application number 17/238673 was filed with the patent office on 2021-08-05 for organic light emitting display apparatus.
The applicant listed for this patent is Samsung Display Co., Ltd.. Invention is credited to Seungji CHA, SangMoo CHOI, ChulKyu KANG, WonKyu KWAK, Dongsun LEE.
Application Number | 20210242300 17/238673 |
Document ID | / |
Family ID | 1000005539453 |
Filed Date | 2021-08-05 |
United States Patent
Application |
20210242300 |
Kind Code |
A1 |
KWAK; WonKyu ; et
al. |
August 5, 2021 |
ORGANIC LIGHT EMITTING DISPLAY APPARATUS
Abstract
An organic light emitting display apparatus includes active
patterns arranged corresponding to a plurality of pixels, and
connected to each other along a first direction, a first
initialization power supply line to which a first initialization
voltage is applied, a second initialization power supply line to
which a second initialization voltage different from the first
initialization voltage is applied, an organic light emitting diode,
and an first transistor which apply the second initialization
voltage to a first electrode of the organic light emitting
diode.
Inventors: |
KWAK; WonKyu; (Seongnam-si,
KR) ; CHOI; SangMoo; (Yongin-si, KR) ; LEE;
Dongsun; (Hwaseong-si, KR) ; KANG; ChulKyu;
(Suwon-si, KR) ; CHA; Seungji; (Seoul,
KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Samsung Display Co., Ltd. |
Yongin-Si |
|
KR |
|
|
Family ID: |
1000005539453 |
Appl. No.: |
17/238673 |
Filed: |
April 23, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
16527608 |
Jul 31, 2019 |
10991788 |
|
|
17238673 |
|
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G09G 3/3275 20130101;
H01L 27/3276 20130101; H01L 27/3265 20130101 |
International
Class: |
H01L 27/32 20060101
H01L027/32 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 6, 2018 |
KR |
10-2018-0091513 |
Claims
1. An organic light emitting display apparatus, comprising: active
patterns arranged corresponding to a plurality of pixels, and
connected to each other along a first direction; a first
initialization power supply line to which a first initialization
voltage is applied; a second initialization power supply line to
which a second initialization voltage different from the first
initialization voltage is applied; an organic light emitting diode;
and a first transistor which apply the second initialization
voltage to a first electrode of the organic light emitting diode,
wherein the first transistor comprises a first_first transistor and
a first_second transistor, a first electrode of the first_first
transistor is electrically connected to a first electrode of the
first_second transistor, and a second electrode of the first_first
transistor is electrically connected to a second electrode of the
first_second transistor.
2. The organic light emitting display apparatus of claim 1, wherein
a second electrode of the first a second initialization signal is
applied to a gate electrode of the first_first transistor and a
gate electrode of the first_second transistor.
3. The organic light emitting display apparatus of claim 2, wherein
the first_first transistor and the first_second transistor are
disposed adjacent to each other.
4. The organic light emitting display apparatus of claim 3, wherein
the active patterns are physically connected to each other in a
pixel of the plurality of pixels, and the active patterns include a
channel region of the first_first transistor and a channel region
of the first_second organic transistor.
5. The organic light emitting display apparatus of claim 2, further
comprising: an initialization line which extends in the first
direction and to which a first initialization signal or a second
initialization signal is applied.
6. The organic light emitting display apparatus of claim 5, wherein
the first_first transistor and the first_second transistor overlap
the initialization line.
7. The organic light emitting display apparatus of claim 1, further
comprises: a second transistor which is electrically connected to a
first power source and the first electrode of the organic light
emitting diode, and applies a driving current corresponding to a
data signal to the organic light emitting diode; a capacitor
electrically connected between a gate electrode of the second
transistor and the first power source; and a third transistor which
applies the first initialization voltage to the gate electrode of
the second transistor and the capacitor in response to a first
initialization signal.
8. The organic light emitting display apparatus of claim 7, further
comprising: a data line extending in a second direction
intersecting with the first direction and to which the data signal
is applied; a fourth transistor electrically connected to a first
electrode of the second transistor and the data line; and a fifth
transistor electrically connected to the gate electrode of the
second transistor and a second electrode of the second
transistor.
9. The organic light emitting display apparatus of claim 1, wherein
the plurality of pixels is arranged in a matrix form in the first
direction and a second direction intersecting the first direction,
the active patterns of the plurality of pixels in the first
direction are connected to each other, and the active patterns of
the plurality of pixels in the second direction include portions
which are disconnected to each other.
10. The organic light emitting display apparatus of claim 9,
wherein the first transistor comprises a first_first transistor and
a first_second transistor, a source electrode of the first_first
transistor is electrically connected to a source electrode of the
first_second transistor, a drain electrode of the first_first
transistor is electrically connected to a drain electrode of the
first_second transistor, a second initialization signal is applied
to a gate electrode of the first_first transistor and a gate
electrode of the first_second transistor, and the first_first
transistor and the first_second transistor are arranged adjacent to
each other in the first direction.
11. An organic light emitting display apparatus, comprising: a
substrate; an active layer comprising active patterns disposed on
the substrate, and connected to each other corresponding to at
least two pixels; a first gate insulation layer disposed on the
substrate on which the active layer is disposed; a first gate layer
disposed on the first gate insulation layer; a second gate
insulation layer disposed on the first gate insulation layer on
which the first gate layer is disposed; a second gate layer
disposed on the second gate insulation layer; an interlayer
insulation layer disposed on the second gate insulation layer on
which the second gate layer is disposed; and a data layer disposed
directly on the interlayer insulation layer.
12. The organic light emitting display apparatus of claim 11,
wherein the first gate layer comprises an initialization line to
which a first initialization signal or a second initialization
signal is applied, a scan line to which a scan signal is applied,
and an emission control line to which an emission control signal is
applied.
13. The organic light emitting display apparatus of claim 12,
wherein the second gate layer comprises a first initialization
power supply line to which a first initialization voltage is
applied and a second initialization power supply line to which a
second initialization power voltage is applied.
14. The organic light emitting display apparatus of claim 13,
wherein the data layer comprises a data line to which a data signal
is applied, and a first power supply line to which a first power
voltage is applied.
15. The organic light emitting display apparatus of claim 14,
further comprising: first_first and first_second transistors, which
apply the second initialization voltage to a first electrode of the
organic light emitting diode in response to the second
initialization signal.
16. The organic light emitting display apparatus of claim 15,
further comprising: a second transistor which is electrically
connected to a first power source and the first electrode of the
organic light emitting diode, and applies a driving current
corresponding to a data signal to the organic light emitting diode;
a capacitor electrically connected between a gate electrode of the
second transistor and the first power source; and a third
transistor which applies the first initialization voltage to the
gate electrode of the second transistor and the capacitor in
response to a first initialization signal.
17. The organic light emitting display apparatus of claim 16,
wherein the data layer further comprises a connecting electrode,
and the connection electrode is connected to the second
initialization power supply line and the first_first and
first_second transistors.
18. The organic light emitting display apparatus of claim 15,
wherein the first first transistor and the first_second transistor
overlap the initialization line.
19. The organic light emitting display apparatus of claim 11,
wherein a plurality of pixels is arranged in a matrix form in a
first direction and a second direction intersecting the first
direction, the active patterns of the plurality of pixels in the
first direction are connected to each other, and the active
patterns of the plurality of pixels in the second direction include
portions which are disconnected to each other.
20. An organic light emitting display apparatus, comprising: an
organic light emitting diode; and first_first and first_second
transistors which apply an organic light emitting diode
initialization voltage to a first electrode of the organic light
emitting diode in response to an organic light emitting diode
initialization signal, and wherein first and second electrodes of
the first_first transistor are electrically connected to first and
second electrodes of the first_second transistor, respectively, and
a gate electrode of the first_first transistor is electrically
connected to a gate electrode of the first_second transistor.
Description
[0001] This application is a continuation of U.S. patent
application Ser. No. 16/527,608, filed on Jul. 31, 2019, which
claims priority to Korean Patent Application No. 10-2018-0091513,
filed on Aug. 6, 2018, and all the benefits accruing therefrom
under 35 U.S.C. .sctn. 119, the content of which in its entirety is
herein incorporated by reference.
BACKGROUND
1. Field
[0002] Exemplary embodiments of the invention relate to a display
apparatus. More particularly, exemplary embodiments of the
invention relate to an organic light emitting display
apparatus.
2. Description of the Related Art
[0003] An organic light emitting display apparatus displays an
image using an OLED ("OLED"). In the OLED, holes provided from an
anode and electrons provided from a cathode combine in a light
emitting layer between the anode electrode and the cathode
electrode to emit light.
[0004] The organic light emitting display apparatus includes a
plurality of pixels, and in order to improve display quality of the
organic light emitting display apparatus, various efforts have been
made to improve a structure of the pixel or a layout implementing
the pixel.
SUMMARY
[0005] One or more exemplary embodiment of the invention provides
an organic light emitting display apparatus capable of improving
display quality.
[0006] According to an exemplary embodiment of the invention, an
organic light emitting display apparatus includes active patterns
arranged corresponding to a plurality of pixels, and connected to
each other along a first direction, a first initialization power
supply line to which a first initialization voltage is applied, a
second initialization power supply line to which a second
initialization voltage different from the first initialization
voltage is applied, an organic light emitting diode, and an first
transistor which apply the second initialization voltage to a first
electrode of the organic light emitting diode.
[0007] In an exemplary embodiment, the first transistor may include
a first_first transistor and a first_second transistor. A first
electrode of the first_first transistor may be electrically
connected to a first electrode of the first_second transistor. A
second electrode of the first_first transistor may be electrically
connected to a second electrode of the first_second transistor. A
second initialization signal may be applied to a gate electrode of
the first_first transistor and a gate electrode of the first_second
transistor.
[0008] In an exemplary embodiment, the first_first transistor and
the first_second transistor may be disposed adjacent to each
other.
[0009] In an exemplary embodiment, the active patterns may be
physically connected to each other in a pixel of the plurality of
pixels. The active patterns may include a channel region of the
first_first transistor and a channel region of the first_second
organic transistor.
[0010] In an exemplary embodiment, the organic light emitting
display apparatus may further include an initialization line which
extends in the first direction and to which a first initialization
signal or a second initialization signal is applied.
[0011] In an exemplary embodiment, the first_first transistor and
the first_second transistor may overlap the initialization
line.
[0012] In an exemplary embodiment, the organic light emitting
display apparatus may further include a second transistor which is
electrically connected to a first power source and the first
electrode of the organic light emitting diode, and applies a
driving current corresponding to a data signal to the organic light
emitting diode, a capacitor electrically connected between a gate
electrode of the second transistor and the first power source, and
a third transistor which applies the first initialization voltage
to the gate electrode of the second transistor and the capacitor in
response to a first initialization signal.
[0013] In an exemplary embodiment, the organic light emitting
display apparatus may further include a data line extending in a
second direction intersecting with the first direction and to which
the data signal is applied, a fourth transistor electrically
connected to a first electrode of the second transistor and the
data line, and a fifth transistor electrically connected to the
gate electrode of the second transistor and a second electrode of
the second transistor.
[0014] In an exemplary embodiment, the plurality of pixels may be
arranged in a matrix form in the first direction and a second
direction intersecting the first direction. The active patterns of
the plurality of pixels in the first direction may be connected to
each other, and the active patterns of the plurality of pixels in
the second direction may include portions which are disconnected to
each other.
[0015] In an exemplary embodiment, the first transistor may further
include a first_first transistor and a first_second transistor. A
source electrode of the first_first transistor may be electrically
connected to a source electrode of the first_second transistor. A
drain electrode of the first_first transistor may be electrically
connected to a drain electrode of the first_second transistor. A
second initialization signal may be applied to a gate electrode of
the first_first transistor and a gate electrode of the first_second
transistor. The first_first transistor and the first_second
transistor may be arranged adjacent to each other in the first
direction.
[0016] According to an exemplary embodiment of the invention, an
organic light emitting display apparatus includes a substrate, an
active layer including active patterns disposed on the substrate,
and connected to each other corresponding to at least two pixels, a
first gate insulation layer disposed on the substrate on which the
active layer is dispose, a first gate layer disposed on the first
gate insulation layer, a second gate insulation layer disposed on
the first gate insulation layer on which the first gate layer is
disposed, a second gate layer disposed on the second gate
insulation layer, an interlayer insulation layer disposed on the
second gate insulation layer on which the second gate layer is
disposed, and a data layer disposed on the interlayer insulation
layer.
[0017] In an exemplary embodiment, the first gate layer may include
an initialization line to which a first initialization signal or a
second initialization signal is applied, a scan line to which a
scan signal is applied, and an emission control line to which an
emission control signal is applied.
[0018] In an exemplary embodiment, the second gate layer may
include a first initialization power supply line to which a first
initialization voltage is applied and a second initialization power
supply line to which a second initialization power voltage is
applied.
[0019] In an exemplary embodiment, the data layer may include a
data line to which a data signal is applied, and a first power
supply line to which a first power voltage is applied.
[0020] In an exemplary embodiment, the organic light emitting
display apparatus may further include first_first and first_second
transistors, which apply the second initialization voltage to a
first electrode of the organic light emitting diode in response to
the second initialization signal.
[0021] In an exemplary embodiment, the organic light emitting
display apparatus may further include a second transistor which is
electrically connected to a first power source and the first
electrode of the organic light emitting diode, and applies a
driving current corresponding to a data signal to the organic light
emitting diode, a capacitor electrically connected between a gate
electrode of the second transistor and the first power source, and
a third transistor which applies the first initialization voltage
to the gate electrode of the second transistor and the capacitor in
response to a first initialization signal.
[0022] In an exemplary embodiment, the data layer may further
include a connecting electrode. The connection electrode may be
connected to the second initialization power supply line and the
first_first and first_second transistors.
[0023] In an exemplary embodiment, the first_first transistor and
the first_second transistor may overlap the initialization
line.
[0024] In an exemplary embodiment, a plurality of pixels may be
arranged in a matrix form in a first direction and a second
direction intersecting the first direction. The active patterns of
the plurality of pixels in the first direction may be connected to
each other, and the active patterns of the plurality of pixels in
the second direction may include portions which are disconnected to
each other.
[0025] According to an exemplary embodiment of the invention, an
organic light emitting display apparatus includes an organic light
emitting diode, and first_first and first_second transistors which
apply an organic light emitting diode initialization voltage to a
first electrode of the organic light emitting diode in response to
an organic light emitting diode initialization signal. First and
second electrodes of the first_first transistor are electrically
connected to first and second electrodes of the first_second
transistor, respectively. A gate electrode of the first_first
transistor is electrically connected to a gate electrode of the
first_second transistor.
[0026] According to the exemplary embodiments of the invention, an
organic light emitting display apparatus includes active patterns
arranged corresponding to a plurality of pixels, and connected to
each other along a first direction, a first initialization power
supply line to which a first initialization voltage is applied, a
second initialization power supply line to which a second
initialization voltage different from the first initialization
voltage is applied, an OLED, and an OLED initialization transistor
which apply the second initialization voltage to an anode electrode
of the OLED.
[0027] Since the active patterns of the active layer are connected
corresponding to the plurality of pixels, static electricity is
dispersed even when the static electricity flows in during a
manufacturing process, use, or the like, and degree of the
characteristic change of the active pattern or the damage of the
active pattern is reduced, so that scattering of first to seventh-b
transistors which is included in the pixel may be reduced.
Accordingly, the display quality of the organic light emitting
display apparatus may be improved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The above and other features of the invention will become
more apparent by describing in detail exemplary embodiments thereof
with reference to the accompanying drawings, in which:
[0029] FIG. 1 is a block diagram illustrating an exemplary
embodiment of an organic light emitting display apparatus according
to the invention;
[0030] FIG. 2 is a circuit diagram illustrating an example of a
pixel included in the organic light emitting display apparatus of
FIG. 1;
[0031] FIG. 3 is a plan view illustrating a layout of the pixels of
the organic light emitting display apparatus of FIGS. 1 and 2;
[0032] FIG. 4A to 4D are plan views each showing an active layer, a
first gate layer, a second gate layer, and a data layer of the
organic light emitting display apparatus of FIG. 1;
[0033] FIG. 5 is a cross-sectional view of the organic light
emitting display apparatus of FIG. 3;
[0034] FIG. 6 is a block diagram illustrating an exemplary
embodiment of an electronic device;
[0035] FIG. 7A is a diagram illustrating an example in which the
electronic device of FIG. 6 is implemented as a television; and
[0036] FIG. 7B is a diagram illustrating an example in which the
electronic device of FIG. 6 is implemented as a smart phone.
DETAILED DESCRIPTION
[0037] Hereinafter, the invention will be explained in detail with
reference to the accompanying drawings.
[0038] It will be understood that when an element is referred to as
being "on" another element, it can be directly on the other element
or intervening elements may be present therebetween. In contrast,
when an element is referred to as being "directly on" another
element, there are no intervening elements present.
[0039] It will be understood that, although the terms "first,"
"second," "third" etc. may be used herein to describe various
elements, components, regions, layers and/or sections, these
elements, components, regions, layers and/or sections should not be
limited by these terms. These terms are only used to distinguish
one element, component, region, layer or section from another
element, component, region, layer or section. Thus, "a first
element," "component," "region," "layer" or "section" discussed
below could be termed a second element, component, region, layer or
section without departing from the teachings herein.
[0040] The terminology used herein is for the purpose of describing
particular embodiments only and is not intended to be limiting. As
used herein, the singular forms "a," "an," and "the" are intended
to include the plural forms, including "at least one," unless the
content clearly indicates otherwise. "Or" means "and/or." As used
herein, the term "and/or" includes any and all combinations of one
or more of the associated listed items. It will be further
understood that the terms "comprises" and/or "comprising," or
"includes" and/or "including" when used in this specification,
specify the presence of stated features, regions, integers, steps,
operations, elements, and/or components, but do not preclude the
presence or addition of one or more other features, regions,
integers, steps, operations, elements, components, and/or groups
thereof.
[0041] Furthermore, relative terms, such as "lower" or "bottom" and
"upper" or "top," may be used herein to describe one element's
relationship to another element as illustrated in the Figures. It
will be understood that relative terms are intended to encompass
different orientations of the device in addition to the orientation
depicted in the Figures. For example, if the device in one of the
figures is turned over, elements described as being on the "lower"
side of other elements would then be oriented on "upper" sides of
the other elements. The exemplary term "lower," can therefore,
encompasses both an orientation of "lower" and "upper," depending
on the particular orientation of the figure. Similarly, if the
device in one of the figures is turned over, elements described as
"below" or "beneath" other elements would then be oriented "above"
the other elements. The exemplary terms "below" or "beneath" can,
therefore, encompass both an orientation of above and below.
[0042] Spatially relative terms, such as "beneath," "below,"
"lower," "above," "upper" and the like, may be used herein for ease
of description to describe one element or feature's relationship to
another element(s) or feature(s) as illustrated in the figures. It
will be understood that the spatially relative terms are intended
to encompass different orientations of the device in use or
operation in addition to the orientation depicted in the figures.
For example, if the device in the figures is turned over, elements
described as "below" or "beneath" other elements or features would
then be oriented "above" the other elements or features. Thus, the
exemplary term "below" can encompass both an orientation of above
and below. The device may be otherwise oriented (rotated 90 degrees
or at other orientations) and the spatially relative descriptors
used herein interpreted accordingly.
[0043] "About" or "approximately" as used herein is inclusive of
the stated value and means within an acceptable range of deviation
for the particular value as determined by one of ordinary skill in
the art, considering the measurement in question and the error
associated with measurement of the particular quantity (i.e., the
limitations of the measurement system). For example, "about" can
mean within one or more standard deviations, or within .+-.30%,
20%, 10%, 5% of the stated value.
[0044] Unless otherwise defined, all terms (including technical and
scientific terms) used herein have the same meaning as commonly
understood by one of ordinary skill in the art to which this
disclosure belongs. It will be further understood that terms, such
as those defined in commonly used dictionaries, should be
interpreted as having a meaning that is consistent with their
meaning in the context of the relevant art and the present
disclosure, and will not be interpreted in an idealized or overly
formal sense unless expressly so defined herein.
[0045] Exemplary embodiments are described herein with reference to
cross section illustrations that are schematic illustrations of
idealized embodiments. As such, variations from the shapes of the
illustrations as a result, for example, of manufacturing techniques
and/or tolerances, are to be expected. Thus, embodiments described
herein should not be construed as limited to the particular shapes
of regions as illustrated herein but are to include deviations in
shapes that result, for example, from manufacturing. For example, a
region illustrated or described as flat may, typically, have rough
and/or nonlinear features. Moreover, sharp angles that are
illustrated may be rounded. Thus, the regions illustrated in the
figures are schematic in nature and their shapes are not intended
to illustrate the precise shape of a region and are not intended to
limit the scope of the present claims.
[0046] FIG. 1 is a block diagram illustrating an organic light
emitting display apparatus according to an exemplary embodiment of
the invention.
[0047] Referring to FIG. 1, the organic light emitting display
apparatus 1000 may include a display panel 100, a scan driver 200,
a data driver 300, an emission control driver 400, a power supply
450, and a controller 470.
[0048] The display panel 100 may include a pixel PX. In an
exemplary embodiment, the display panel 100 may include n*m pixels
PX, where n and m are natural numbers, because the pixels PX are
arranged at locations corresponding to crossing points of the scan
lines SL1 through SLn and the data lines DL1 through DLm, for
example.
[0049] The scan driver 200 may provide a scan signal to the pixel
PX via the scan lines SL1 through SLn based on a first control
signal CTL1.
[0050] The data driver 300 may provide a data signal to the pixel
PX via the data lines DL1 through DLm based on a second control
signal CTL2.
[0051] The emission control driver 400 may provide an emission
control signal to the pixel PX via the emission control lines EM1
through EMn based on a third control signal CTL3.
[0052] The power supply 450 may provide power sources such as a
first power source ELVDD, a second power source ELVSS, a first
initialization power source VINT1, a second initialization power
source VINT2, etc. A voltage level of the second power source ELVSS
may be lower than a voltage level of the first power source ELVDD.
The power supply 450 may provide a first power source ELVDD to a
first power terminal of the pixel PX and to selectively provide the
first power source ELVDD or the second power source ELVSS to a
second power terminal of the pixel PX. Here, the second power
terminal of the pixel PX may be connected to a cathode electrode of
an OLED. The first initialization power source VINT1 and the second
initialization power source VINT2 may have a voltage level between
the first power source ELVDD and the second power source ELVSS. The
voltage level of the first initialization power source VINT1 may be
higher than the voltage level of the second initialization power
source VINT2.
[0053] The controller 470 may control the scan driver 200, the data
driver 300, the emission control driver 400, and the power supply
450. The controller 470 may provide the first control signal CLT1
to the scan driver 200 to control the scan driver 200. The
controller 470 may provide the second control signal CLT2 to the
data driver 300 to control the data driver 300. The controller 470
may provide the third control signal CLT3 to the emission control
driver 400 to control the emission control driver 400. The
controller 470 may provide the fourth control signal CTL4 to the
power supply 450 to control the power supply 450.
[0054] FIG. 2 is a circuit diagram illustrating an example of a
pixel included in the organic light emitting display apparatus of
FIG. 1.
[0055] Referring to FIG. 2, the pixel PX may include a plurality of
transistors T1 through T7a and T7b and a driving capacitor C. In an
exemplary embodiment, the first transistor T1 may be connected
between the first power source ELVDD and an anode electrode of an
organic light emitting diode ("OLED") and may provide a driving
current corresponding to the data signal Vdata to the OLED, for
example. The second transistor T2 may be connected between the
first electrode of the first transistor T1 and the data line. The
third transistor T3 may be connected between the gate electrode and
the second electrode of the first transistor T1. The fourth
transistor T4 may be connected between a first initialization power
source VINT1 and the gate electrode of the first transistor T1. The
fifth transistor T5 may be connected between the first power source
ELVDD and the first electrode of the first transistor T1. The sixth
transistor T6 may be connected between the second electrode of the
first transistor T1 and the anode electrode of the OLED. The
seventh-a transistor T7a and a seventh-b transistor T7b may be
connected between a second initialization power source VINT2 and
the anode electrode of the OLED. The gate electrode of the first
transistor T1 may be connected to a first node N1 which is
connected to the driving capacitor C, third transistor T3 and the
fourth transistor T4.
[0056] Specifically, the fourth transistor T4 may apply a voltage
of the first initialization power source VINT1 to the driving
capacitor C and the gate electrode of the first transistor T1 in
response to a first initialization signal GI to reset the driving
capacitor C and the gate electrode of the first transistor T1 as
the first initialization power source VINT1. That is, the fourth
transistor T4 may be an initialization transistor.
[0057] The seventh-a and seventh-b transistors T7a and T7b may be
connected to a second initialization signal GB to reset the voltage
of the anode electrode of the OLED to the second initialization
voltage VINT2. The seventh-a and seventh-b transistors T7a and T7b
may apply the second initializing voltage VINT2 to the anode
electrode of the OLED in response to the second initialization
signal GB. That is, the seventh-a and seventh-b transistors T7a and
T7b may be first and second OLED initialization transistors,
respectively.
[0058] Here, the seventh-a and seventh-b transistors T7a and T7b
may be connected in parallel to each other. That is, a gate
electrode of the seventh-a transistor T7a and a gate electrode of
the seventh-b transistor-a T7b may be connected to each other, a
first electrode of the seventh-a transistor T7a and a first
electrode of the seventh-b transistor-a T7b may be connected to
each other, and a second electrode of the seventh-a transistor T7a
and a second electrode of the seventh-b transistor-a T7b may be
connected to each other.
[0059] The second transistor T2 may apply a data signal Vdata to
the first transistor T1 in response to a scan signal GW.
[0060] The third transistor T3 may compensate a threshold voltage
of the first transistor T1 in response to the scan signal GW by
connecting the gate electrode and the drain electrode of the first
transistor T1 (i.e., a diode connection of the first transistor
T1). Because the second transistor T2 and the third transistor T3
may receive the scan signal GW, the data signal Vdata may be
applied while the threshold voltage of the first transistor T1 is
compensated.
[0061] The first transistor T1 may provide the driving current
corresponding to the data signal Vdata to the OLED.
[0062] The sixth transistor T6 may be located between the second
electrode of the first transistor T1 and the anode electrode of the
OLED. The sixth transistor T6 may control light emission of the
OLED in response to an emission control signal EM.
[0063] Although the exemplary embodiments of FIG. 2 describe that
the pixel PX includes the first through seventh transistors T1
through T7b and the driving capacitor C, the pixel may be
implemented as a variety of structures.
[0064] FIG. 3 is a plan view illustrating a layout of the pixels of
the organic light emitting display apparatus of FIGS. 1 and 2. FIG.
4A to 4D are plan views each showing an active layer, a first gate
layer, a second gate layer, and a data layer of the organic light
emitting display apparatus of FIG. 1. FIG. 5 is a cross-sectional
view of the organic light emitting display apparatus of FIG. 3.
[0065] Referring to FIGS. 3, 4A, 4B, 4C, 4D and 5, the organic
light emitting display apparatus may include a substrate 100, a
buffer layer 110, an active layer, a first gate insulation layer
120, a first gate layer, a second gate insulation layer 130, a
second gate layer, a interlayer insulation layer 140, a data layer,
a via layer 150, a light emitting structure 160, a pixel defining
layer PDL, and a thin film encapsulation layer 190.
[0066] The substrate 100 including transparent or opaque insulation
materials may be provided. In an exemplary embodiment, the
substrate 100 may include a quartz substrate, a synthetic quartz
substrate, a calcium fluoride substrate, a fluoride-doped quartz
substrate, a soda lime glass substrate, a non-alkali glass
substrate etc., for example. In an alternative exemplary
embodiment, the substrate 100 may include a flexible transparent
material such as a flexible transparent resin substrate (e.g., a
polyimide substrate).
[0067] The buffer layer 110 may be disposed on the substrate 100.
The buffer layer 110 may prevent the diffusion of metal atoms
and/or impurities from the substrate 100 into the active layer. In
addition, the buffer layer 110 may control a rate of a heat
transfer in a crystallization process for forming the active
pattern, thereby obtaining substantially uniform the active
layer.
[0068] The active layer may be disposed on the buffer layer 110.
The active layer may include a plurality of active patterns. Each
of the active patterns may be arranged corresponding to the
plurality of pixels along the first direction D1 and may form one
wiring physically connected in the first direction D1. The active
patterns may be disconnected from each other in a second direction
D2 that intersects the first direction D1.
[0069] The active pattern may include amorphous silicon or
polycrystalline silicon. In exemplary embodiments, the active
pattern may include oxide of at least one substance including
indium (In), gallium (Ga), stannum (Sn), zirconium (Zr), vanadium
(V), hafnium (Hf), cadmium (Cd), germanium (Ge), chromium (Cr),
titanium (Ti), and zinc (Zn), for example. The active pattern ACT
may include a source region S and a drain region D doped with an
impurity, and a channel region C disposed between the source region
S and the drain region D of each of the 1, 2, 3, 4, 5, 6, 7a and 7b
transistors T1, T2, T3, T4, T5, T6, T7a and T7b. (refer to FIG.
5).
[0070] The first gate insulation layer 120 may be disposed on the
buffer layer 110 on which the active layer is disposed. The first
gate insulation layer 120 may be uniformly disposed on the buffer
layer 110 along a profile of the active layer. In an exemplary
embodiment, the first gate insulation layer 120 may include a
silicon compound, metal oxide, etc., for example.
[0071] The first gate layer may be disposed on the first gate
insulation layer 120. The first gate layer may include a first gate
electrode GE1 of the first transistor T1 (GE of the sixth
transistor T6 in FIG. 5), an initialization line GI/GB, a scan line
GW, and a light emission control line EM. In an exemplary
embodiment, the first gate layer may be provided using metal,
alloy, metal nitride, conductive metal oxide, transparent
conductive material, etc., for example.
[0072] The initialization line GI/GB may extend in the first
direction D1. A first initialization signal GI or a second
initialization signal GB may be applied to the initialization line
GI/GB.
[0073] The scan line GW may extend in the first direction D1. The
scan line GW may be disposed between the initialization line GI/GB
and the light emission control line EM. A scan signal GW may be
applied to the scan line GW.
[0074] The light emission control line EM may extend in the first
direction D1. The emission control signal EM may be applied to the
light emission control line EM.
[0075] The second gate insulation layer 130 may be disposed on the
first gate insulation layer 120 on which the first gate layer is
disposed. The second gate insulation layer 130 may be uniformly
disposed on the first gate insulation layer 120 along a profile of
the first gate layer. The second gate insulation layer 130 may
include a silicon compound, metal oxide, etc., for example.
[0076] The second gate layer may be disposed on the second gate
insulation layer 130. The second gate layer may include a first
initialization power supply line VINT1, a second initialization
power supply line VINT2, and a storage electrode CSTE. The second
gate layer may be provided using a metal, an alloy, a metal
nitride, a conductive metal oxide, a transparent conductive
material, or the like.
[0077] The first initialization power supply line VINT1 may extend
in the first direction D1. The first initialization voltage VINT1
may be applied to the first initialization power supply line
VINT1.
[0078] The second initialization power supply line VINT2 may extend
in the first direction D1. A second initialization power voltage
VINT2 may be applied to the second initialization power supply line
VINT2.
[0079] The storage electrode CSTE may be disposed to overlap with
the first gate electrode GE1 to form a driving capacitor C with the
first gate electrode GE1.
[0080] The interlayer insulation layer 140 may be disposed on the
second gate insulation layer 130 on which the second gate layer is
disposed. In an exemplary embodiment, the second gate insulation
layer 130 may have a relatively large thickness for sufficiently
covering the active pattern, so that the second gate insulation
layer 130 may have a substantially level surface, for example. In
an exemplary embodiment, the interlayer insulation layer 140 may be
uniformly disposed on the second gate insulation layer 130 along a
profile of the second gate layer. The interlayer insulation layer
140 may be provided using an organic or inorganic insulating
material. The interlayer insulation layer 140 may include a
plurality of layers.
[0081] The data layer may be disposed on the interlayer insulation
layer 140. The data layer may include ae data line Vdata, a first
power supply line ELVDD, a first connecting electrode CE1, a second
connecting electrode CE2, a third connecting electrode CE3, and a
via contact electrode VC.
[0082] The data line Vdata may extend in the second direction D2. A
data signal Vdata may be applied to the data line Vdata. The data
line Vdata may be electrically connected to the active layer
through contact holes defined through the interlayer insulation
layer 140, the second gate insulation layer 130, and the first gate
insulation layer 120.
[0083] The first power supply line ELVDD may extend in the second
direction D2. A first power source voltage ELVDD may be applied to
the first power source line ELVDD. The first power supply line
ELVDD may be electrically connected to the active layer and the
second gate electrode via contact holes defined through the
interlayer insulation layer 140, the second gate insulation layer
130, and the first gate insulation layer 120.
[0084] The first connecting electrode CE1 may be electrically
connected to the active layer and the second gate layer through
contact holes defined through the interlayer insulation layer 140,
the second gate insulation layer 130, and the first gate insulation
layer 120. Thus, the first connecting electrode CE1 may be
connected to the first initialization power supply line VINT1 and
the fourth transistor T4.
[0085] The second connecting electrode CE2 may be electrically
connected to the active layer and the second gate layer through
contact holes defined through the interlayer insulation layer 140,
the second gate insulation layer 130, and the first gate insulation
layer 120. Thus, the second connecting electrode CE2 may be
connected to the second initialization power supply line VINT2 and
the seventh-a and seventh-b transistors T7a and T7b.
[0086] The third connecting electrode CE3 may be electrically
connected to the active layer and the first gate layer through
contact holes defined through the interlayer insulation layer 140,
the second gate insulation layer 130, and the first gate insulation
layer 120. Thus, the third connecting electrode CE3 may be
connected to the first transistor T1 and the third transistor
T3.
[0087] The via contact electrode VC maybe electrically connected to
the active layer through contact holes defined through the
interlayer insulation layer 140, the second gate insulation layer
130, and the first gate insulation layer 120. That is, the via
contact electrode VC may be connected to the sixth transistor
T6.
[0088] The via layer 150 may be disposed on the interlayer
insulation layer 140 on which the data layer is disposed. The via
layer 150 may have a single-layered structure or a multi-layered
structure including at least two insulation films. The via layer
150 may be provided using an organic material. In an exemplary
embodiment, the via layer 150 may include photoresist, acryl-based
resin, polyimide-based resin, polyamide-based resin, siloxane-based
resin, etc., for example. In an exemplary embodiment, the via layer
150 may be provided using an inorganic material such as a silicon
compound, a metal, a metal oxide, or the like.
[0089] The light emitting structure 160 may include a first
electrode 161, an emission layer 162 and a second electrode
163.
[0090] The first electrode 161 may be disposed on the via layer
150. The first electrode 161 may include a reflective material or a
transmissive material in accordance with the emission type of the
display apparatus. In an exemplary embodiment, the first electrode
161 may be provided using aluminum, alloy including aluminum,
aluminum nitride, silver, alloy including silver, tungsten,
tungsten nitride, copper, alloy including copper, nickel, alloy
including nickel, chrome, chrome nitride, molybdenum, alloy
including molybdenum, titanium, titanium nitride, platinum,
tantalum, tantalum nitride, neodymium, scandium, strontium
ruthenium oxide, zinc oxide, indium tin oxide, tin oxide, indium
oxide, gallium oxide, indium zinc oxide, etc., for example. These
may be used alone or in a combination thereof. In exemplary
embodiments, the first electrode 161 may have a single layer
structure or a multi layer structure, which may include a metal
film, an alloy film, a metal nitride film, a conductive metal oxide
film and/or a transparent conductive film.
[0091] The pixel defining layer PDL may be disposed on the via
layer 150 on which the first electrode 161 is disposed. The pixel
defining layer PDL may be provided using an organic material. In an
exemplary embodiment, the pixel defining layer PDL may include
photoresist, acryl-based resin, polyimide-based resin,
polyamide-based resin, siloxane-based resin, etc., for example. In
exemplary embodiments, an opening which exposes the first electrode
161 may be defined by etching the pixel defining layer PDL. An
emitting area and a non-emitting area of the display apparatus may
be defined by the opening of the pixel defining layer PDL. In an
exemplary embodiment, a portion where the opening of the pixel
defining layer PDL is located may correspond to the emitting area,
and the non-emitting area may correspond to a portion adjacent to
the opening of the pixel defining layer PDL, for example.
[0092] The light emitting layer 162 may be disposed on the first
electrode 161 exposed through the opening of the pixel defining
layer PDL. In addition, the light emitting layer 162 may extend on
a sidewall of the opening of the pixel defining layer PDL. In
exemplary embodiments, the light emitting layer 182 may include an
organic light emitting layer ("EL"), a hole injection layer
("HIL"), a hole transfer layer ("HTL"), an electron transfer layer
("ETL"), an electron injection layer ("EIL"), etc. In exemplary
embodiments, except for the organic emission layer, the HIL, the
hole transport layer, the electron transport layer, and the
electron injection layer may be provided in common to correspond to
a plurality of pixels. In exemplary embodiments, a plurality of ELs
may be provided using light emitting materials for generating
different colors of light such as a red color of light, a green
color of light and a blue color of light in accordance with color
pixels of the display device. In exemplary embodiments, the EL of
the light emitting layer 162 may include a plurality of stacked
light emitting materials for generating a red color of light, a
green color of light and a blue color of light to thereby emitting
a white color of light. Here, elements of the light emitting layer
162 are commonly provided so as to correspond to a plurality of
pixels, and each pixel may be divided by a color filter layer.
[0093] The second electrode 163 may be disposed on the pixel
defining layer PDL and the light emitting layer 162. The second
electrode 163 may include a transmissive material or a reflective
material in accordance with the emission type of the display
device. In an exemplary embodiment, the second electrode 163 may be
provided using aluminum, alloy including aluminum, aluminum
nitride, silver, alloy including silver, tungsten, tungsten
nitride, copper, alloy including copper, nickel, alloy including
nickel, chrome, chrome nitride, molybdenum, alloy including
molybdenum, titanium, titanium nitride, platinum, tantalum,
tantalum nitride, neodymium, scandium, strontium ruthenium oxide,
zinc oxide, indium tin oxide, tin oxide, indium oxide, gallium
oxide, indium zinc oxide, etc., for example. These may be used
alone or in a combination thereof. In exemplary embodiments, the
second electrode 163 may also have a single layer structure or a
multi layer structure, which may include a metal film, an alloy
film, a metal nitride film, a conductive metal oxide film and/or a
transparent conductive film.
[0094] The thin film encapsulation layer 190 may be disposed on the
second electrode 163. The thin film encapsulation layer 190 may
prevent penetration of moisture and oxygen from outside. The thin
film encapsulation layer 190 may include a first inorganic layer,
an organic layer and a second inorganic layer. The first inorganic
layer, the organic layer, and the second inorganic layer may be
sequentially stacked on the second electrode 163.
[0095] Here, the thin film encapsulation layer 190 may include at
least one organic layer and at least one inorganic layer. The at
least one organic layer and the at least one inorganic layer may be
alternately stacked with each other. In the illustrated exemplary
embodiment, the thin film encapsulation layer 190 includes the
first and second inorganic layers and one organic layer
therebetween, but the invention is not limited thereto.
[0096] Here, the plurality of pixels may be arranged in a matrix in
a first direction D1 and a second direction D2 intersecting the
first direction D1. The seventh-a transistor T7a and the second
OLED initialization transistor which is the seventh-b transistor
T7b may be disposed adjacent to each other in the first direction
D1. In addition, the seventh-a transistor T7a and the seventh-b
transistor T7b may be disposed adjacent to each other in the first
direction D1 with respect to the fourth transistor of the adjacent
pixel in the second direction D2.
[0097] According to the illustrated exemplary embodiment, since the
active patterns of the active layer are connected corresponding to
the plurality of pixels, static electricity is dispersed even when
the static electricity flows in during a manufacturing process,
use, or the like, and degree of the characteristic change of the
active pattern or the damage of the active pattern is reduced, so
that scattering of the first to seventh-b transistors may be
reduced. Accordingly, the display quality of the organic light
emitting display apparatus may be improved.
[0098] FIG. 6 is a block diagram illustrating an electronic device
according to exemplary embodiments. FIG. 7A is a diagram
illustrating an example in which the electronic device of FIG. 6 is
implemented as a television. FIG. 7B is a diagram illustrating an
example in which the electronic device of FIG. 6 is implemented as
a smart phone.
[0099] Referring to FIGS. 6 through 7B, the electronic device 500
may include a processor 510, a memory device 520, a storage device
530, an input/output ("I/O") device 540, a power supply 550, and an
organic light emitting display apparatus 560. Here, the organic
light emitting display apparatus 560 may correspond to the display
apparatus 1000 of FIG. 1. In addition, the electronic device 500
may further include a plurality of ports for communicating with a
video card, a sound card, a memory card, a universal serial bus
("USB") device, other electronic devices, etc. In an exemplary
embodiment, as illustrated in FIG. 7A, the electronic device 500
may be implemented as a television. In another exemplary
embodiment, as illustrated in FIG. 7B, the electronic device 500
may be implemented as a smart phone. However, the electronic device
500 is not limited thereto. In an exemplary embodiment, the
electronic device 500 may be implemented as a cellular phone, a
video phone, a smart pad, a smart watch, a tablet personal computer
("PC"), a car navigation system, a computer monitor, a laptop, a
head disposed (e.g., mounted) display ("HMD"), etc., for
example.
[0100] The processor 510 may perform various computing functions.
In an exemplary embodiment, the processor 510 may be a
microprocessor, a central processing unit ("CPU"), an application
processor ("AP"), etc., for example. In an exemplary embodiment,
the processor 510 may be coupled to other components via an address
bus, a control bus, a data bus, etc., for example. Further, the
processor 510 may be coupled to an extended bus such as a
peripheral component interconnection ("PCI") bus. The memory device
520 may store data for operations of the electronic device 500. In
an exemplary embodiment, the memory device 520 may include at least
one non-volatile memory device such as an erasable programmable
read-only memory ("EPROM") device, an electrically erasable
programmable read-only memory ("EEPROM") device, a flash memory
device, a phase change random access memory ("PRAM") device, a
resistance random access memory ("RRAM") device, a nano floating
gate memory ("NFGM") device, a polymer random access memory
("PoRAM") device, a magnetic random access memory ("MRAM") device,
a ferroelectric random access memory ("FRAM") device, etc., and/or
at least one volatile memory device such as a dynamic random access
memory ("DRAM") device, a static random access memory ("SRAM")
device, a mobile DRAM device, etc., for example. In an exemplary
embodiment, the storage device 530 may include a solid state drive
("SSD") device, a hard disk drive ("HDD") device, a CD-ROM device,
etc., for example. In an exemplary embodiment, the I/O device 540
may include an input device such as a keyboard, a keypad, a mouse
device, a touchpad, a touch-screen, etc., and an output device such
as a printer, a speaker, etc. The power supply 550 may provide
power for operations of the electronic device 500.
[0101] The organic light emitting display apparatus 560 may be
coupled to other components via the buses or other communication
links. In exemplary embodiments, the organic light emitting display
apparatus 560 may be included in the I/O device 540. As described
above, the organic light emitting display apparatus 560 may include
active patterns arranged corresponding to a plurality of pixels,
and connected to each other along a first direction, a first
initialization power supply line to which a first initialization
voltage is applied, a second initialization power supply line to
which a second initialization voltage different from the first
initialization voltage is applied, an OLED, and an OLED
initialization transistor which apply the second initialization
voltage to an anode electrode of the OLED.
[0102] The invention may be applied to organic light emitting
display apparatus and various electronic devices including the
same. In an exemplary embodiment, the invention may be applied to a
mobile phone, a smart phone, a video phone, a smart pad, a smart
watch, a tablet PC, a car navigation system, a television, a
computer monitor, a notebook, a head mount display and the like,
for example.
[0103] The foregoing is illustrative of the invention and is not to
be construed as limiting thereof. Although exemplary embodiments of
the invention have been described, those skilled in the art will
readily appreciate that many modifications are possible in the
exemplary embodiments without materially departing from the novel
teachings and advantages of the invention. Accordingly, all such
modifications are intended to be included within the scope of the
invention as defined in the claims. In the claims,
means-plus-function clauses are intended to cover the structures
described herein as performing the recited function and not only
structural equivalents but also equivalent structures. Therefore,
it is to be understood that the foregoing is illustrative of the
invention and is not to be construed as limited to the specific
exemplary embodiments disclosed, and that modifications to the
disclosed exemplary embodiments, as well as other exemplary
embodiments, are intended to be included within the scope of the
appended claims. The invention is defined by the following claims,
with equivalents of the claims to be included therein.
* * * * *