U.S. patent application number 11/931648 was filed with the patent office on 2008-08-28 for display device and driving method therefor.
Invention is credited to Jong-heon Han, Sung-il Lee, Seob Shin.
Application Number | 20080204392 11/931648 |
Document ID | / |
Family ID | 39715322 |
Filed Date | 2008-08-28 |
United States Patent
Application |
20080204392 |
Kind Code |
A1 |
Han; Jong-heon ; et
al. |
August 28, 2008 |
DISPLAY DEVICE AND DRIVING METHOD THEREFOR
Abstract
A display device, includes: a plurality of thin film transistors
which comprise a gate electrode, a source electrode and a drain
electrode; a plurality of pixel electrodes which are respectively
connected to the drain electrode of the thin film transistors; a
plurality of gate lines which are respectively disposed to the
opposite edge parts of the pixel electrodes in a lengthwise
direction of the pixel electrodes, and connected to the gate
electrode of the thin film transistors; and a plurality of data
lines which are respectively disposed to a single edge part of the
pixel electrodes in a widthwise direction of the pixel electrodes,
and connected to the source electrode of the thin film transistors,
a pair of pixel electrodes adjoining each other to interpose the
single data line therebetween, and a pair of thin film transistors
which are respectively connected to the pair of pixel electrodes
being connected with the same single data line.
Inventors: |
Han; Jong-heon;
(Hwaseong-si, KR) ; Shin; Seob; (Seoul, KR)
; Lee; Sung-il; (Namyangju-si, KR) |
Correspondence
Address: |
MACPHERSON KWOK CHEN & HEID LLP
2033 GATEWAY PLACE, SUITE 400
SAN JOSE
CA
95110
US
|
Family ID: |
39715322 |
Appl. No.: |
11/931648 |
Filed: |
October 31, 2007 |
Current U.S.
Class: |
345/92 ;
345/96 |
Current CPC
Class: |
G09G 3/3614 20130101;
G09G 2300/0426 20130101; G09G 3/3648 20130101; G09G 2310/0297
20130101; G09G 2300/0465 20130101 |
Class at
Publication: |
345/92 ;
345/96 |
International
Class: |
G09G 3/36 20060101
G09G003/36 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 28, 2007 |
KR |
10-2007-0020270 |
Claims
1. A display device, comprising: a plurality of thin film
transistors which comprise a gate electrode, a source electrode and
a drain electrode; a plurality of pixel electrodes which are
respectively connected to the drain electrode of the thin film
transistors; a plurality of gate lines which are respectively
disposed to the opposite edge parts of the pixel electrodes in a
lengthwise direction of the pixel electrodes, and connected to the
gate electrode of the thin film transistors; and a plurality of
data lines which are respectively disposed to a single edge part of
the pixel electrodes in a widthwise direction of the pixel
electrodes, and connected to the source electrode of the thin film
transistors, a pair of pixel electrodes adjoining each other to
interpose the single data line therebetween, and a pair of thin
film transistors which are respectively connected to the pair of
pixel electrodes being connected with the same single data
line.
2. The display device according to claim 1, wherein the pair of
thin film transistors which are connected to the single data line
are connected with the different gate line.
3. The display device according to claim 2, wherein the gate line
is disposed in a pair between the pixel electrodes arranged in the
widthwise direction, and the data line is alternately disposed
between the pixel electrodes arranged in the lengthwise
direction.
4. The display device according to claim 3, wherein the pair of
gate lines which are disposed between the pixel electrodes
respectively are applied with a gate signal in different directions
and wherein the display device further comprises an integrated
driving circuit chip which is connected with the data lines and a
shift register which is respectively connected with the gate lines
and the integrated driving circuit chip.
5. The display device according to claim 3, wherein the pair of
pixel electrodes which face each other to interpose the single data
line therebetween are applied with a data signal which has the same
polarity, and the pair of pixel electrodes are applied with the
data signal which has different polarities from another pair of
pixel electrodes vicinal in the lengthwise direction of the data
lines.
6. The display device according to claim 6, wherein the polarity of
the data signal which is applied from the single data line changes
per two pixel electrodes.
7. The display device according to claim 3, wherein the pair of
pixel electrodes which face each other to interpose the single data
line therebetween are applied with a data signal which has the same
polarity and wherein the data signal which has different polarities
is alternately applied to per three pixel electrodes in the
lengthwise direction of the data lines.
8. The display device according to claim 7, wherein the polarity of
the data signal which is applied from the single data line changes
per six pixel electrodes.
9. The display device according to claim 3, wherein the pair of
pixel electrodes which face each other to interpose the single data
line therebetween are applied with a data signal which has the same
polarity, and wherein all pixel electrodes which are connected with
the single data line are applied with the data signal which has the
same polarity.
10. The display device according to claim 3, wherein the pair of
pixel electrodes which face each other to interpose the single data
line therebetween are applied with the data signal which has
different polarities.
11. The display device according to claim 10, wherein the pixel
electrodes are applied with the data signal which has different
polarities from other pixel electrodes vicinal in the lengthwise
direction of the data lines, and wherein the polarity of the data
signal which is applied from the single data line changes per two
pixel electrodes from a second pixel electrode.
12. The display device according to claim 10, wherein the pixel
electrodes which are arranged in the lengthwise direction of the
data lines are applied with the data signal which has the same
polarity, and wherein the polarity of the data signal which is
applied from the single data line changes per one pixel
electrode.
13. A driving method of a display device which comprises a
plurality of pixel electrodes, a plurality of data lines which are
disposed to a single edge part which crosses a lengthwise direction
of the pixel electrodes, and a plurality of gate lines which are
respectively disposed to the opposite edge parts which parallel the
lengthwise direction of the pixel electrodes, the driving method
comprising: applying a driving voltage to the pixel electrodes
through the data lines by an inversion driving method.
14. The driving method of the display device according to claim 13,
wherein a pair of pixel electrodes which face each other to
interpose the single data line therebetween are applied with a data
signal which has the same polarity.
15. The driving method of the display device according to claim 14,
wherein the pair of pixel electrodes are applied with the data
signal which has different polarities from another pair of pixel
electrodes vicinal in the lengthwise direction of the data
lines.
16. The driving method of the display device according to claim 15,
wherein the polarity of the data signal which is applied through
the single data line changes per two pixel electrodes.
17. The driving method of the display device according to claim 14,
wherein the data signal which has different polarities is
alternately applied to per three pixel electrodes in the lengthwise
direction of the data lines.
18. The driving method of the display device according to claim 14,
wherein all pixel electrodes which are connected with the single
data line are applied with the data signal which has the same
polarity.
19. The driving method of the display device according to claim 13,
wherein the pair of pixel electrodes which face each other to
interpose the single data line therebetween are applied with the
data signal which has different polarities.
20. The driving method of the display device according to claim 24,
wherein the pixel electrodes are applied with the data signal which
has different polarities from other pixel electrodes vicinal in the
lengthwise direction of the data lines, and wherein the polarity of
the data signal which is applied through the single data line
changes per two pixel electrodes from a second pixel electrode.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority from Korean Patent
Application No. 10-2007-0020270, filed on Feb. 28, 2007 in the
Korean Intellectual Property Office, the disclosure of which is
incorporated herein by reference.
BACKGROUND OF INVENTION
[0002] 1. Field of Invention
[0003] This invention relates to display apparatus and, more
particularly, to simplifying the configuration and improving the
aperture ratio of the display.
[0004] 2. Description of the Related Art
[0005] A liquid crystal display (LCD) panel having a plurality of
thin film transistors, pixel electrodes, gate lines and data lines,
etc. formed in the display area of the display device. An
integrated driving circuit chip connected with the gate line, the
data line, etc. may be mounted in a non-display area of the or
formed integrally therewith as are various other circuits and a
thin film wiring, etc. IIn a conventional display device, the
presence of these components limits the ability to reduce the size
of the non-display area. In addition, many of the integrated
circuit driving chips are relatively expensive.
[0006] Also, in the conventional display device, the opaque data
lines and gate lines are extended to surround the pixel electrodes
thereby reducing the aperture ration.
SUMMARY OF THE INVENTION
[0007] In accordance with an aspect of the invention, the foregoing
problems can be obviated by providing a display device, including:
a plurality of thin film transistors each having a gate electrode,
a source electrode and a drain electrode; a plurality of pixel
electrodes respectively connected to the drain electrode of the
thin film transistors; a plurality of gate lines respectively
disposed lengthwise to the opposite edge parts of the pixel
electrodes and connected to the gate electrodes of the thin film
transistors; and a plurality of data lines respectively disposed
widthwise to a single edge part of the pixel electrodes and
connected to the source electrodes of the thin film transistors, a
single data line being interposed between a pair of adjoining pixel
electrodes, and a pair of thin film transistors respectively
connected to the pair of pixel electrodes that are connected with
the same single data line.
[0008] According to an aspect of the invention, the pair of thin
film transistors which are connected to the single data line are
connected with the different gate line.
[0009] According to an aspect of the invention, the gate line is
disposed in a pair between the pixel electrodes arranged in the
widthwise direction, and the data line is alternately disposed
between the pixel electrodes arranged in the lengthwise
direction.
[0010] According to an aspect of the invention, the pair of gate
lines which are disposed between the pixel electrodes respectively
are applied with a gate signal in different directions.
[0011] According to an aspect of the invention, the display device
further includes an integrated driving circuit chip which is
connected with the data lines, and a shift register which is
respectively connected with the gate lines and the integrated
driving circuit chip.
[0012] According to an aspect of the invention, the pair of pixel
electrodes which face each other to interpose the single data line
therebetween are applied with a data signal which has the same
polarity.
[0013] According to an aspect of the invention, the pair of pixel
electrodes are applied with the data signal which has different
polarities from another pair of pixel electrodes vicinal in the
lengthwise direction of the data lines.
[0014] According to an aspect of the invention, the polarity of the
data signal which is applied from the single data line changes per
two pixel electrodes.
[0015] According to an aspect of the invention, the data signal
which has different polarities is alternately applied to per three
pixel electrodes in the lengthwise direction of the data lines.
[0016] According to an aspect of the invention, the polarity of the
data signal which is applied from the single data line changes per
six pixel electrodes.
[0017] According to an aspect of the invention, all pixel
electrodes which are connected with the single data line are
applied with the data signal which has the same polarity.
[0018] According to an aspect of the invention, the pair of pixel
electrodes which face each other to interpose the single data line
therebetween are applied with the data signal which has different
polarities.
[0019] According to an aspect of the invention, the pixel
electrodes are applied with the data signal which has different
polarities from other pixel electrodes vicinal in the lengthwise
direction of the data lines.
[0020] According to an aspect of the invention, the polarity of the
data signal which is applied from the single data line changes per
two pixel electrodes from a second pixel electrode.
[0021] According to an aspect of the invention, the pixel
electrodes which are arranged in the lengthwise direction of the
data lines are applied with the data signal which has the same
polarity.
[0022] According to an aspect of the invention, the polarity of the
data signal which is applied from the single data line changes per
one pixel electrode.
[0023] The foregoing and/or other aspects of the present invention
can be achieved by providing a driving method of a display device
which includes a plurality of pixel electrodes, a plurality of data
lines which are disposed to a single edge part which crosses a
lengthwise direction of the pixel electrodes, and a plurality of
gate lines which are respectively disposed to the opposite edge
parts which parallel the lengthwise direction of the pixel
electrodes, the driving method including: applying a driving
voltage to the pixel electrodes through the data lines by an
inversion driving method.
[0024] According to an aspect of the invention, a pair of pixel
electrodes which face each other to interpose the single data line
therebetween are applied with a data signal which has the same
polarity.
[0025] According to an aspect of the invention, the pair of pixel
electrodes are applied with the data signal which has different
polarities from another pair of pixel electrodes vicinal in the
lengthwise direction of the data lines.
[0026] According to an aspect of the invention, the polarity of the
data signal which is applied through the single data line changes
per two pixel electrodes.
[0027] According to an aspect of the invention, the data signal
which has different polarities is alternately applied to per three
pixel electrodes in the lengthwise direction of the data lines.
[0028] According to an aspect of the invention, the polarity of the
data signal which is applied through the single data line changes
per six pixel electrodes.
[0029] According to an aspect of the invention, all pixel
electrodes which are connected with the single data line are
applied with the data signal which has the same polarity.
[0030] According to an aspect of the invention, the pair of pixel
electrodes which face each other to interpose the single data line
therebetween are applied with the data signal which has different
polarities.
[0031] According to an aspect of the invention, the pixel
electrodes are applied with the data signal which has different
polarities from other pixel electrodes vicinal in the lengthwise
direction of the data lines.
[0032] According to an aspect of the invention, the polarity of the
data signal which is applied through the single data line changes
per two pixel electrodes from a second pixel electrode.
[0033] According to an aspect of the invention, the pixel
electrodes which are arranged in the lengthwise direction of the
data lines are applied with the data signal which has the same
polarity.
[0034] According to an aspect of the invention, the polarity of the
data signal which is applied through the single data line changes
per one pixel electrode.
BRIEF DESCRIPTION OF THE DRAWINGS
[0035] The above and/or other aspects of the present invention will
become apparent and more readily appreciated from the following
description of the exemplary embodiments, taken in conjunction with
the accompanying drawings, in which:
[0036] FIG. 1 is a equivalent circuit diagram of a display device
according to a first exemplary embodiment of the present
invention;
[0037] FIG. 2 illustrates a data signal applied to the display
device in FIG. 1;
[0038] FIG. 3 is an arrangement diagram illustrating a part of the
display device in FIG. 1 centering on a first display
substrate;
[0039] FIG. 4 is a sectional view illustrating the display device
including the first display substrate in FIG. 1 taken along line
IV-IV;
[0040] FIG. 5 is a equivalent circuit diagram of a display device
according to a second exemplary embodiment of the present
invention;
[0041] FIG. 6 illustrates a data signal applied to the display
device in FIG. 5;
[0042] FIG. 7 is a equivalent circuit diagram of a display device
according to a third exemplary embodiment of the present
invention;
[0043] FIG. 8 illustrates a data signal applied to the display
device in FIG. 7;
[0044] FIG. 9 is a equivalent circuit diagram of a display device
according to a fourth exemplary embodiment of the present
invention;
[0045] FIG. 10 illustrates a data signal applied to the display
device in FIG. 9;
[0046] FIG. 11 is a equivalent circuit diagram of a display device
according to a fifth exemplary embodiment of the present invention;
and
[0047] FIG. 12 illustrates a data signal applied to the display
device in FIG. 11.
DETAILED DESCRIPTION
[0048] As shown in the accompanying drawings, a display device
using an amorphous silicon (a-Si) thin film transistor (TFT) formed
by a five mask process is exemplarily described. Alternatively, the
present invention may be applied to a display device of various
types.
[0049] As shown in FIG. 1, a display device 901 includes a first
display substrate 100, a second display substrate 200 adjoining the
first display substrate 100, and a liquid crystal layer 300 shown
in FIG. 4 disposed between the first display substrate 100 and the
second display substrate 200. The second display substrate 200 has
an area smaller than the first display substrate 100. Accordingly,
an edge of the first display substrate 100 is not overlaid by the
second display substrate 200, and other edges of the first display
substrate 100 are overlaid by the second display substrate 200.
Also, the display device 901 is divided into a display area D
formed with a pixel, and a non display area N around the display
area D. Here, the pixel refers to a minimum unit displaying an
image.
[0050] The display area D is formed to an area in which the first
display substrate 100 and the second display substrate 200 are
overlaid each other, and the non display area N is divided into a
first area N1 in which the display substrate 100 and the second
display substrate 200 are overlaid each other, and a second area N2
in which only the first display substrate 100 is disposed.
[0051] Also, the display device 901 further includes an integrated
driving circuit chip 500 mounted on the second area N2 in which
only the first display substrate 100 is disposed. That is, the
first display substrate 100 and the second display substrate 200
don't overlap each other in the second area N2.
[0052] The first display substrate 100 includes a plurality of thin
film transistors (TFT) 101 formed to the display area D, a
plurality of pixel electrodes 180, a plurality of gate lines 121, a
plurality of data lines 161, etc.
[0053] Also, the first display substrate 100 further includes a
thin film wiring 421, a shift register 410 and other circuit units
formed to the non display area N. The thin film wiring 421 connects
the integrated driving circuit chip 500 and the shift register 410
each other. The shift register 410 crosses an edge of the first
display substrate 100 mounted with the integrated driving circuit
chip 500, and is respectively formed to the opposite edges of the
first display substrate 100. The shift register 410 supplies a gate
signal received from the integrated driving circuit chip 500 to the
plurality of gate lines 121 in sequence.
[0054] The data line 161 and the gate line 121 are extended from
the display area D to the non display area N to be respectively
connected with the integrated driving circuit chip 500 and the
shift register 410.
[0055] The second display substrate 200 includes a light blocking
member 220 shown in FIG. 4 formed to the display area D, a color
filter 230 shown in FIG. 4, a common electrode 280 shown in FIG. 4,
etc. Here, the color filter 230 is disposed to correspond to the
pixel electrode 180. The color filter 230 includes the three
primary colors of red, green and blue alternately arranged in at
least one of a lengthwise direction (x-axis direction) and a
widthwise direction (y-axis direction) of the pixel electrode.
Also, the light blocking member 220, the common electrode 280, etc.
are formed to the non display area N together.
[0056] The thin film transistor 101 includes a gate electrode 124
shown in FIG. 3, a source electrode 165 shown in FIG. 3 and a drain
electrode 166 shown in FIG. 3. The pixel electrode 180 is connected
to the drain electrode 166 of the thin film transistor 101. The
gate line 121 is respectively disposed to the opposite edges of the
pixel electrode 180 in the lengthwise direction (x-axis direction)
of the pixel electrode 180, and is connected with the gate
electrode 124 of the thin film transistor 101. The data line 161 is
respectively disposed to only an edge of the pixel electrode 180 in
the widthwise direction (y-axis direction) of the pixel electrode
180, and is connected with the source electrode 165 of the thin
film transistor 101. That is, a pair of gate lines 121 are disposed
between the pixel electrodes 180 neighboring in the widthwise
direction (y-axis direction). A pair of pixel electrodes 180
neighboring in the lengthwise direction (x-axis direction) is
disposed between the neighboring data lines 161. Here, the length
of the pixel electrode 180 in the lengthwise direction is bigger
than the length thereof in the widthwise direction.
[0057] Here, the two gate lines 121 disposed between the pixel
electrodes 180 respectively transmit a gate signal in different
directions. That is, one of the two gate lines 121 disposed between
the pixel electrodes 180 is connected with the shift register 410
formed to a first edge of the first display substrate 100. Also,
the other of the two gate lines 121 disposed between the pixel
electrodes 180 is connected with the shift register 410 formed to a
second edge of the first display substrate 100 adjoining the first
edge.
[0058] Also, a pair of adjoining pixel electrodes 180 interpose a
single data line 161 therebetween. Here, a pair of thin film
transistors 101 respectively connected to the pair of pixel
electrodes 180 are connected with the same single data line 161.
Also, the pair of thin film transistors 101 connected to the single
data line 161 are connected with different gate lines 121.
[0059] With this configuration, the total number of the data line
161 can be reduced without deteriorating resolution of the display
device 901. Accordingly, the display device 901 can simplify the
configuration thereof, slim the appearance thereof, and improve
aperture ratio.
[0060] That is, in comparison with the pixel electrode 180, the
display device 901 can significantly reduce the total number of the
data line 161. In detail, since the data line 161 is disposed in
the lengthwise direction of the pixel electrode 180, the total
number of the data line 161 can be reduced in comparison with a
case in which the data line 161 is disposed in the widthwise
direction of the pixel electrode 180. Also, the data line 161 is
alternately disposed between the pixel electrodes 180 arranged in
the lengthwise direction (x-axis direction). Accordingly, the total
number of the data line 161 can be reduced by half in comparison
with a case in which the data line 161 is disposed between the
pixel electrodes 180 without omission.
[0061] On the other hand, since the gate line 121 is arranged in
the widthwise direction of the pixel electrode 180, the number of
the gate line 121 relatively increases in comparison with a case in
which the gate line 121 is arranged in the lengthwise direction of
the pixel electrode 180.
[0062] However, the gate signal transmitted through the gate line
121 is relatively simple in comparison with a data signal
transmitted through the data line 161. Accordingly, the total
number of the integrated driving circuit chip 500 necessary to
supply the data signal and the gate signal through the data line
161 and the gate line 121 can be reduced. Also, productivity of the
display device 901 can be improved by reducing use of the
integrated driving circuit chip 500 relatively expensive.
[0063] Also, since the gate line 121 receives the gate signal from
the shift register 410 respectively formed to the opposite edges of
the first display substrate 100, use of the integrated driving
circuit chip 500 for supplying the gate signal can be significantly
reduced.
[0064] Accordingly, in the display device 901, the ratio of the non
display area N compared with the display area D can be reduced.
Accordingly, the display device 901 can be further slimmed.
[0065] Also, as the number of the data line 161 is reduced, an area
occupied by the pixel electrode 180 can be widened, thereby
improving aperture ratio.
[0066] Hereinafter, a driving method of the display device 901
according to the first exemplary embodiment of the present
invention will be described centering on a data signal.
[0067] As shown in FIG. 1, a pair of pixel electrodes 180 adjoining
each other having a single data line 161 therebetween are supplied
with a data signal having different polarity from the same data
line. Also, the pixel electrode 180 is applied with the data signal
having different polarity from another pixel electrode 180 adjacent
in the lengthwise direction of the data line 161. Here, the data
signal includes a driving voltage applied to the pixel electrode
180 through the thin film transistor 101.
[0068] FIG. 2 illustrates the data signal applied through the data
line 161. S001 refers to the data signal applied through a first
data line 161, and S002 refers to the data signal applied through a
second data line 161.
[0069] As shown in FIG. 2, the polarity of the data signal applied
from the single data line 161 to a first pixel electrode 180 and a
second pixel electrode 180 is changed each other. Also, the
polarity is changed from the second pixel electrode 180 per two
pixel electrode 180. Accordingly, the display device 901 shown in
FIG. 1 seems to be driven by a 1dot inversion driving method, but
substantially, is driven like a 2dot inversion driving method.
[0070] With this driving method, the display device 901 can display
an image having the same resolution with substantially reducing the
number of the data line 161 by half.
[0071] Hereinafter, a configuration of the display device 901 will
be described in detail by referring to FIGS. 3 and 4. FIG. 3 is an
arrangement diagram illustrating a part of the display device 901
centering on the first display substrate 100. FIG. 4 is a sectional
view illustrating the display device 901 including the first
display substrate 100 in FIG. 3 taken along line IV-IV.
[0072] At first, the first display substrate 100 will be described
in detail.
[0073] A first substrate member 110 includes material such as
glass, quartz, ceramic, plastic, etc., and is formed to be
transparent.
[0074] A gate wiring including a plurality of gate lines 121, and a
plurality of gate electrodes 124 branched from the gate line 121 is
formed on the first substrate member 110. The gate wiring may
further include a plurality of first storage electrode lines (not
shown).
[0075] The gate wiring 121 and 124 is formed of metal such as Al,
Ag, Cr, Ti, Ta, Mo, etc., or an alloy including the above metals.
As shown in FIG. 2, the gate wiring 121 and 124 is provided as a
single layer. Alternatively, the gate wiring 121 and 124 may be
formed as multi layers including a metal layer of Cr, Mo, Ti, Ta
having a superior physical chemistry property, or an alloy
including the above metals, and a metal layer of Al series or Ag
series having a small specific resistance. Alternatively, the gate
wiring 121 and 124 may be formed of various metals or electrical
conductors, and may be preferably but not necessarily provided as
multi layers being capable of being patterned under the same
etching condition.
[0076] A gate insulating layer 130 is formed of silicon nitride
(SiNx), etc. on the gate wiring 121 and 124.
[0077] A data wiring including a plurality of data lines 161
crossing the gate line 121, a plurality of source electrodes 165
branched from the data line 161 so that at least a part thereof can
be overlaid with the gate electrode 124, and a plurality of drain
electrodes 166 distanced from the source electrode 165 so that at
least a part thereof can be overlaid with the gate electrode 124 is
formed over the gate insulating layer 130. Also, the data wiring
may further include a plurality of second storage electrode lines
(not shown).
[0078] The data wiring 161, 165 and 166 is formed of an electrical
conductive material such as chrome, molybdenum, aluminum, or an
alloy including the above metals, and may be provided as a single
layer or multi layers like the gate wiring 121 and 124.
[0079] A semiconductor layer 140 is formed to an area covering from
an upper part of the source electrode 165 over the gate electrode
124 to a lower part of the source electrode 165 and the drain
electrode 166. Here, the gate electrode 124, the source electrode
165 and the drain electrode 166 are employed for three electrodes
of the thin film transistor 101. The semiconductor layer 140
between the source electrode 165 and the drain electrode 166 is
employed for a channel area of the thin film transistor 101.
[0080] Here, as shown in FIG. 1, a pair of pixel electrodes 180
face to interpose a single data line 161 therebetween. Here, a pair
of thin film transistors 101, the drain electrodes 166 of which are
respectively connected to the pair of pixel electrodes 180 are
connected with the same single data line 161. Also, the gate
electrodes 124 of the pair of thin film transistors 101, the source
electrodes 165 of which are connected to the single data line 161
are connected with different gate lines 121.
[0081] Also, an ohmic contact 155 and 156 is formed between the
semiconductor layer 140 and the source electrode 165, and between
the semiconductor layer 140 and the drain electrode 165 to
respectively reduce a contact resistance. The ohmic contact 155 and
156 is formed of silicide or amorphous silicon doped with an n-type
impurity of high density, or the like.
[0082] On the data wiring 161, 165 and 166, a passivation layer 170
is formed of a low dielectric constant insulating material such as
a-Si:C:O, a-Si:O:F, etc., or an inorganic insulating material such
as silicon nitride, silicon oxide, etc. by mean of a plasma
enhanced vapor deposition (PECVD).
[0083] A plurality of pixel electrodes 180 are formed on the
passivation layer 170. The pixel electrode 180 includes a
transparent conductive material such as indium tin oxide (ITO),
indium zinc oxide (IZO) or the like. Also, the pixel electrode 180
may further include an opaque conductive material having a superior
light reflecting property such as aluminum, etc. according to the
type of a display panel.
[0084] Also, the passivation layer 170 includes a plurality of
contact holes 171 exposing a part of the drain electrode 166. The
pixel electrode 180 and the drain electrode 166 are electrically
connected through the contact hole 171.
[0085] Hereinafter, the second display substrate 200 will be
described in detail.
[0086] A second substrate member 210 includes material such as
glass, quartz, ceramic, plastic, etc. to be transparent like the
first substrate member 110.
[0087] The light blocking member 220 is formed on the second
substrate member 210. The light blocking member 220 includes an
opening part facing the pixel electrode 180 of the first display
substrate 100, and intercepts a light leaking between vicinal
pixels. The light blocking member 220 is formed to a position
corresponding to the thin film transistor 10 for blocking an
external light entering the semiconductor layer 140 of the thin
film transistor 10. The light blocking member 220 may be formed of
a photoresist organic material added with black pigment. Here, the
black pigment may employ carbon black, titanium oxide, etc. Also,
the light blocking member 220 may be formed of a metallic
material.
[0088] The color filter 230 having the three primary colors is
disposed in order over the second substrate member 210 formed with
the light blocking member 220. Here, the color filter 230 may have
at least one various color instead of the three primary colors. A
boundary of each color filter 230 is positioned over the light
blocking member 220. Alternatively, edge parts of the vicinal color
filters 230 may be overlaid to accomplish a function like the light
blocking member 220 blocking a leaking light. Here, the light
blocking member 220 may be omitted.
[0089] A planarization film 240 is formed over the light blocking
member 220 and the color filter 230. The planarization film 240 may
be omitted.
[0090] The common electrode 280 is formed over the planarization
film 240 to form an electric field together with the pixel
electrode 180. The common electrode 280 is formed of a transparent
conductive material such as ITO, IZO or the like.
[0091] With this configuration, the total number of the data line
161 can be relatively reduced with maintaining resolution of the
display apparatus 901. Accordingly, the configuration of the
display apparatus 901 can be simplified, the external appearance
thereof can be slimmed, and aperture ratio thereof can be
improved.
[0092] Hereinafter, a driving method of a display apparatus 902
according to a second exemplary embodiment of the present invention
will be described centering on a data signal by referring to FIGS.
5 and 6.
[0093] As shown in FIG. 5, a pair of pixel electrodes 180 adjoining
each other to interpose a single data line 161 therebetween are
applied with a data signal having the same polarity from the same
data line 161. The pair of pixel electrodes 180 are applied with
the data signal having different polarities from another pair of
pixel electrodes 180 adjacent in a lengthwise direction of the data
line 161.
[0094] FIG. 6 illustrates the data signal applied through the data
line 161. S001 refers to the data signal applied through a first
data line 161, and S002 refers to the data signal applied through a
second data line 161.
[0095] As shown in FIG. 6, the polarity of the data signal applied
from the single data line 161 is changed per two pixel electrode
180. That is, the display apparatus 902 is driven by a 2dot
inversion driving method.
[0096] With this driving method, the display device 902 can display
an image having the same resolution with substantially reducing the
number of the data line 161 by half.
[0097] Hereinafter, a driving method of a display apparatus 903
according to a third exemplary embodiment of the present invention
will be described centering on a data signal by referring to FIGS.
7 and 8.
[0098] As shown in FIG. 7, a pair of pixel electrodes 180 adjoining
each other to interpose a single data line 161 therebetween are
applied with a data signal having the same polarity from the same
data line 161. The data signal having different polarities is
alternately applied to per three pairs of pixel electrodes 180 in a
lengthwise direction of the data line 161.
[0099] FIG. 8 illustrates the data signal applied through the data
line 161. S001 refers to the data signal applied through a first
data line 161, and S002 refers to the data signal applied through a
second data line 161.
[0100] As shown in FIG. 8, the polarity of the data signal applied
from the single data line 161 is changed per six pixel electrode
180. That is, the display apparatus 903 is driven by a 6dot
inversion driving method.
[0101] With this driving method, the display device 903 can display
an image having the same resolution with substantially reducing the
number of the data line 161 by half.
[0102] Hereinafter, a driving method of a display apparatus 904
according to a fourth exemplary embodiment of the present invention
will be described centering on a data signal by referring to FIGS.
9 and 10.
[0103] As shown in FIG. 9, a pair of pixel electrodes 180 adjoining
each other to interpose a single data line 161 therebetween are
applied with a data signal having different polarities from the
same data line 161. Also, the pixel electrodes 180 arranged in a
lengthwise direction of the data line 161 are applied with the data
signal having the same polarity.
[0104] FIG. 10 illustrates the data signal applied through the data
line 161. S001 refers to the data signal applied through a first
data line 161, and S002 refers to the data signal applied through a
second data line 161.
[0105] As shown in FIG. 10, the polarity of the data signal applied
from the single data line 161 is changed per one pixel electrode
180. Accordingly, the display apparatus 904 shown in FIG. 9 seems
to be driven by a column inversion driving method, but
substantially, is driven like a 1dot inversion driving method.
[0106] With this driving method, the display device 904 can display
an image having the same resolution with substantially reducing the
number of the data line 161 by half.
[0107] Hereinafter, a driving method of a display apparatus 905
according to a fifth exemplary embodiment of the present invention
will be described centering on a data signal by referring to FIGS.
11 and 12.
[0108] As shown in FIG. 11, a pair of pixel electrodes 180
adjoining each other to interpose a single data line 161
therebetween are applied with a data signal having the same
polarity from the same data line 161. The pixel electrodes 180
arranged in a lengthwise direction of the data line 161 are applied
with the data signal having the same polarity.
[0109] FIG. 12 illustrates the data signal applied through the data
line 161. S001 refers to the data signal applied through a first
data line 161, and S002 refers to the data signal applied through a
second data line 161.
[0110] As shown in FIG. 12, all pixel electrodes 180 connected with
the single data line 161 are applied with the data signal having
the same polarity. Accordingly, the display apparatus 905 is driven
by a column inversion driving method.
[0111] With this driving method, the display device 905 can display
an image having the same resolution with substantially reducing the
number of the data line 161 by half.
[0112] In the several exemplary embodiments of the present
invention, a pair of pixel electrodes 180 adjoining each other to
interpose a single data line 161 therebetween may be more
preferably but not necessarily applied with a data signal having
the same polarity than a data signal having different polarities
from the same data line 161. If a polarity inversion period of the
data signal is excessively short, inferiority due to a signal delay
may happen.
[0113] As described above, the present invention provides a display
device relatively reducing the number of data lines with
maintaining resolution of the display device. Accordingly, the
configuration of the display device can be simplified, and aperture
ratio thereof can be improved.
[0114] That is, the display device can reduce the total number of
integrated driving circuit chips by significantly reducing the
number of the data lines in comparison with a pixel electrode.
Accordingly, productivity of the display device can be improved by
reducing a use of the integrated driving circuit chip relatively
expensive.
[0115] Also, the use of the integrated driving circuit chip can be
further minimized by transmitting a gate signal to a gate line by
using a shift register.
[0116] Also, ratio of a non display area compared with a display
area can be reduced. Accordingly, the display device can have an
external appearance further slimmed.
[0117] Also, an area occupied by a pixel electrode can be widened
as the number of a data line decreases. Accordingly, aperture ratio
of the display device can be improved.
[0118] Also, the present invention provides a driving method of the
display device.
[0119] Although a few exemplary embodiments of the present
invention have been shown and described, it will be appreciated by
those skilled in the art that changes may be made in these
exemplary embodiments without departing from the principles and
spirit of the invention, the scope of which is defined in the
appended claims and their equivalents.
* * * * *