U.S. patent application number 12/499073 was filed with the patent office on 2014-05-29 for ac led device and method for fabricating the same.
This patent application is currently assigned to INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE. The applicant listed for this patent is Ming-Te Lin. Invention is credited to Ming-Te Lin.
Application Number | 20140145215 12/499073 |
Document ID | / |
Family ID | 41504338 |
Filed Date | 2014-05-29 |
United States Patent
Application |
20140145215 |
Kind Code |
A9 |
Lin; Ming-Te |
May 29, 2014 |
AC LED device and method for fabricating the same
Abstract
An AC LED device and method for fabricating the same are
disclosed. An exemplary embodiment of the AC LED device includes at
least two separate AC LED unit chips, wherein each of the AC LED
unit chip includes a substrate having a first light emitting module
and a second light emitting module. Each of the first and second
light emitting modules includes a plurality of light emitting micro
diodes connected between a first conductive electrode and a second
conductive electrode, wherein the amount of light emitting micro
diodes emitting light during a positive half cycle of an AC charge
is equal to that during a negative half cycle of an AC charge. A
plurality of conductive wires is respectively and electrically
connected to the separate AC LED unit chips without passive
devices.
Inventors: |
Lin; Ming-Te; (Taipei
County, TW) |
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Applicant: |
Name |
City |
State |
Country |
Type |
Lin; Ming-Te |
Taipei County |
|
TW |
|
|
Assignee: |
INDUSTRIAL TECHNOLOGY RESEARCH
INSTITUTE
Hsinchu
TW
|
Prior
Publication: |
|
Document Identifier |
Publication Date |
|
US 20100006868 A1 |
January 14, 2010 |
|
|
Family ID: |
41504338 |
Appl. No.: |
12/499073 |
Filed: |
July 7, 2009 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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12021072 |
Jan 28, 2008 |
8503500 |
|
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12499073 |
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11245255 |
Oct 7, 2005 |
7474681 |
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12021072 |
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61078844 |
Jul 8, 2008 |
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Current U.S.
Class: |
257/88 ;
257/E21.499; 257/E33.056; 438/28 |
Current CPC
Class: |
H01L 25/0753 20130101;
F21K 9/00 20130101; H01L 2224/48091 20130101; H01L 2224/48137
20130101; Y02B 20/348 20130101; Y02B 20/30 20130101; H05B 45/40
20200101; Y02B 20/342 20130101; H01L 2224/48091 20130101; H01L
2924/00014 20130101 |
Class at
Publication: |
257/88 ; 438/28;
257/E33.056; 257/E21.499 |
International
Class: |
H01L 33/00 20060101
H01L033/00; H01L 21/50 20060101 H01L021/50 |
Foreign Application Data
Date |
Code |
Application Number |
May 13, 2005 |
TW |
094115514 |
Claims
1. An AC LED device, comprising: at least two separate AC LED unit
chips, wherein each of the AC LED unit chip comprises: a substrate
having a first light emitting module and a second light emitting
module, wherein each of the first and second light emitting modules
comprises a plurality of light emitting micro diodes connected
between a first conductive electrode and a second conductive
electrode, wherein the amount of light emitting micro diodes
emitting light during a positive half cycle of an AC charge is
equal to that during a negative half cycle of an AC charge; and a
plurality of conductive wires respectively and electrically
connected to the separate AC LED unit chips.
2. The AC LED device as claimed in claim 1, wherein the second
light emitting module has the same circuitry as the first light
emitting module.
3. The AC LED device as claimed in claim 1, wherein the AC LED unit
chips are not electrically connected to a passive device.
4. The AC LED device as claimed in claim 1, wherein the light
emitting micro diodes are series connected.
5. The AC LED device as claimed in claim 1, wherein the light
emitting micro diodes are parallel connected.
6. The AC LED device as claimed in claim 1, wherein the first and
second light emitting module of each of the AC LED unit chips are
series connected to form a first light emitting diode module chain
and a second light emitting diode module chain, respectively.
7. The AC LED device as claimed in claim 6, wherein the first and
second light emitting diodes module chains are parallel connected
between an alternating current power supply and a node.
8. The AC LED device as claimed in claim 1, wherein each of the
first and second light emitting modules further comprises two light
emitting units parallel connected, wherein one of the light
emitting units is composed of the light emitting micro diodes
coupled in a forward conduction direction from the first conductive
electrode to the second conductive electrode, another of the light
emitting units is composed of the light emitting micro diodes
coupled in a forward conduction direction from the second
conductive electrode to the first conductive electrode.
9. The AC LED device as claimed in claim 8, wherein the light
emitting micro diodes of the each light emitting unit are series
connected.
10. The AC LED device as claimed in claim 1, wherein each of the
first and second light emitting modules further comprises a
plurality of light emitting units, which are composed of at least
two light emitting micro diodes, series connected, wherein one of
the light emitting micro diodes of the each light emitting unit is
coupled in a forward conduction direction from the first conductive
electrode to the second conductive electrode, and another of the
light emitting micro diode of the each light emitting unit is
coupled in a forward conduction direction from the second
conductive electrode to the first conductive electrode.
11. The AC LED device as claimed in claim 1, wherein each of the
first and second light emitting modules further comprises one or
more bridge light emitting units, series connected, and a circuit
structure of the light emitting micro diodes of the each bridge
light emitting unit is arranged according to a bridge
rectifier.
12. The AC LED device as claimed in claim 1, wherein the AC LED
unit chips are series connected from an alternating current power
supply to a node, and the first and second light emitting modules
of the same AC LED unit chip are series connected.
13. The AC LED device as claimed in claim 12, wherein the first
light emitting module of one of the AC LED unit chips is series
connected to the second light emitting module of another of the AC
LED unit chips.
14. The AC LED device as claimed in claim 1, wherein the first and
second light emitting modules of the same AC LED unit chip share
the same first or second conductive electrode.
15. The AC LED device as claimed in claim 14, wherein the first and
second light emitting module of each of the AC LED unit chips are
series connected to form first and second light emitting diodes
module chains, respectively.
16. The AC LED device as claimed in claim 14, wherein the first and
second light emitting diodes module chains are parallel connected
between an alternating current power supply and a node.
17. The AC LED device as claimed in claim 14, wherein the first
light emitting module of one of the AC LED unit chips is series
connected to the second light emitting module of another of the AC
LED unit chips.
18. The AC LED device as claimed in claim 1, wherein the AC LED
device receives a predetermined voltage of 90Vrms, 100Vrms,
110Vrms, 132Vrms, 150Vrms, 162Vrms, 240Vrms or 264Vrms.
19. A method for fabricating an AC LED device, comprising:
fabricating the AC LED unit chips as claimed in claim 1; sorting
the AC LED unit chips by measuring their driving voltages;
selecting the sorted AC LED unit chips to compose an AC LED device
that receives a predetermined voltage; and connecting the selected
and sorted AC LED unit chips to each other by bonding conductive
wires to form an AC LED device that receives the predetermined
voltage.
20. The method for fabricating an AC LED device as claimed in claim
19 wherein the predetermined voltage comprises 90Vrms, 100Vrms,
110Vrms, 132Vrms, 150Vrms, 162Vrms, 240Vrms or 264Vrms.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional
Application No. 61/078,844 filed Jul. 8, 2008, the entirety of
which is incorporated by reference herein.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present disclosure relates to alternating current light
emitting diodes (AC LED) device, and more particularly, relates to
an AC LED device without passive devices.
[0004] 2. Description of the Related Art
[0005] Light emitting diodes (LED) devices have advantages such as
long lifespan and energy efficiency, when compared to other
illumination sources. However, conventional LED devices, driven by
direct current (DC), require an additional current transducer, to
transform alternating current (AC) from an AC power source to
direct current. Therefore, a conventional DC device has a larger
volume, a higher cost and poorer energy efficiency when compared to
a conventional AC LED device. However, conventional LEDs arranged
in an AC LED device have poor stability due to variations in
driving voltage to the LEDs. For example, if the LEDs of an AC LED
device have a small driving voltage, an over-current problem occurs
in the circuit while receiving the fixed AC power. Thus, generally,
an additional resistor device is coupled to the AC LED device to
adjust applied voltage thereto, which increases volume and
costs.
[0006] A novel AC LED device, minimizing driving voltage variations
therein and method for fabricating the same are desirable.
BRIEF SUMMARY OF INVENTION
[0007] An alternating current (AC) light emitting diodes (LED)
device and method for fabricating the same are provided. An
exemplary embodiment of the AC LED device comprises at least two
separate AC LED unit chips, wherein each of the AC LED unit chip
comprises a substrate having a first light emitting module and a
second light emitting module. Each of the first and second light
emitting modules comprises a plurality of light emitting micro
diodes connected between a first conductive electrode and a second
conductive electrode, wherein the amount of light emitting micro
diodes emitting light during a positive half cycle of an AC charge
is equal to that during a negative half cycle of an AC charge. A
plurality of conductive wires is respectively and electrically
connected to the separate AC LED unit chips without passive
devices.
[0008] Another exemplary embodiment of a method for fabricating an
AC LED device comprises: fabricating the light emitting unit chips;
sorting the light emitting unit chips by measuring their driving
voltages; selecting the sorted light emitting unit chips to compose
an AC LED device that receives a predetermined voltage; and
connecting the selected and sorted light emitting unit chips to
each other by bonding conductive wires to form an AC LED device
that receives the predetermined voltage.
[0009] A detailed description is given in the following embodiments
with reference to the accompanying drawings.
BRIEF DESCRIPTION OF DRAWINGS
[0010] The present disclosure can be more fully understood by
reading the subsequent detailed description and examples with
references made to the accompanying drawings, wherein:
[0011] FIG. 1 shows one exemplary embodiment of an AC LED device of
the present disclosure.
[0012] FIGS. 2a to 2b show circuitry designs of exemplary
embodiments of an AC LED unit chip of the present disclosure.
[0013] FIGS. 3a to 3c show circuitry designs of exemplary
embodiments of an AC LED unit chip of the present disclosure.
[0014] FIGS. 4a to 4c show other exemplary embodiments of an AC LED
device of the present disclosure.
[0015] FIG. 5 shows a circuitry design of one exemplary embodiment
of an AC LED unit chip as shown in FIGS. 4b and 4c.
[0016] FIG. 6 shows a process chart of fabricating one exemplary
embodiment of an AC LED device of the present disclosure.
DETAILED DESCRIPTION OF INVENTION
[0017] The following description is of a mode of carrying out the
present disclosure. This description is made for the purpose of
illustrating the general principles of the present disclosure and
should not be taken in a limiting sense. The scope of the present
disclosure is best determined by reference to the appended claims.
Wherever possible, the same reference numbers are used in the
drawings and the descriptions to refer the same or like parts.
[0018] Accordingly, some exemplary embodiments of an alternating
current (AC) light emitting diodes (LED) device are provided. FIG.
1 shows one exemplary embodiment of an AC LED device 500a of the
present disclosure. As shown in FIG. 1, the AC LED device 500a
comprises a plurality of separated AC LED unit chips 250, for
example, AC LED unit chips 252, 254, 256 and 258. In one
embodiment, the AC LED unit chips 252, 254, 256 and 258 may be the
same AC LED unit chip. The AC LED unit chip 252 comprises a
substrate 200 having two portions 202 and 204. The portion 202
comprises a first light emitting module 210, which is composed of a
plurality of light emitting micro diodes (not shown), electrically
connected between a first conductive electrode 206 and a second
conductive electrode 208. The portion 204 comprises a second light
emitting module 216, which is composed of a plurality of light
emitting micro diodes (not shown), electrically connected between a
third conductive electrode 212 and a fourth conductive electrode
214. In one embodiment, the first light emitting module 210 may
have the same circuitry as the second light emitting module 216. A
plurality of conductive wires 218a to 218j are used to electrically
connect the separated AC LED unit chips 250, a node 220 and an
alternating current (AC) power supply 222a to each other. As shown
in FIG. 1, two terminals of the conductive wire 218a are
electrically connected to the first conductive electrode 206 of the
AC LED unit chip 252 and the node 220, respectively. Two terminals
of the conductive wire 218b are electrically connected to the third
conductive electrode 212 of the AC LED unit chip 252 and the node
220, respectively. Two terminals of the conductive wire 218c are
electrically connected to the second conductive electrode 208 of
the AC LED unit chip 252 and the first conductive electrode 206 of
the adjacent AC LED unit chip 254, respectively. Two terminals of
the conductive wire 218d are electrically connected to the fourth
conductive electrode 214 of the AC LED unit chip 252 and the third
conductive electrode 212 of the adjacent AC LED unit chip 254,
respectively. Similarly, the conductive wire 218e is respectively
and electrically connected to the second conductive electrode 208
of the AC LED unit chip 254 and the first conductive electrode 206
of the adjacent AC LED unit chip 256. The conductive wire 218f is
respectively and electrically connected to the fourth conductive
electrode 214 of the AC LED unit chip 254 and the third conductive
electrode 212 of the adjacent AC LED unit chip 256. The conductive
wire 218g is respectively and electrically connected to the second
conductive electrode 208 of the AC LED unit chip 256 and the first
conductive electrode 206 of the adjacent AC LED unit chip 258. The
conductive wire 218h is respectively and electrically connected to
the fourth conductive electrode 214 of the AC LED unit chip 256 and
the third conductive electrode 212 of the adjacent AC LED unit chip
258. The conductive wire 218i is respectively and electrically
connected to the second conductive electrode 208 of the AC LED unit
chip 258 and the alternating current (AC) power supply 222a. The
conductive wire 218j is respectively and electrically connected to
the fourth conductive electrode 214 of the AC LED unit chip 258 and
the alternating current (AC) power supply 222a. Therefore, an LED
module chain formed by the first light emitting modules 210 of each
of the AC LED unit chips 250 series connected and another LED
module chain formed by the second light emitting modules 216 of
each of the AC LED unit chips 250, are, parallel connected between
the AC power supply 222a and the node 220, and form the AC LED
device 500a.
[0019] In one embodiment, the light emitting module of the AC LED
unit chip may have various circuitry designs to achieve
requirements for adjusting the amount of the light emitting micro
diodes that emit light during a positive half cycle of an AC
charge, so that they equal to the light emitting micro diodes that
emit light during a negative half cycle of an AC charge. FIGS. 2a
to 2b show circuitry designs of exemplary embodiments of an AC LED
unit chip of the present disclosure. FIG. 2a shows a circuitry
design of one embodiment of light emitting modules 210 and 216 of
an AC LED unit chip 250a of the present disclosure. The first light
emitting module 210 is electrically connected to the first
conductive electrode 206 and the second conductive electrode 208.
The first light emitting module 210 comprises two light emitting
units 210a and 210b, parallel connected, wherein the light emitting
unit 210a is composed of eight light emitting micro diodes 228, for
example, the light emitting micro diodes 228a to 228h, connected in
series. As shown in FIG. 2a, an anode of the light emitting micro
diodes 228a is electrically connected to the first conductive
electrode 206, a cathode of the light emitting micro diodes 228a is
electrically connected to an anode of the adjacent light emitting
micro diodes 228b, a cathode of the light emitting micro diodes
228b is electrically connected to an anode of the adjacent light
emitting micro diodes 228c, and so on . . . , and a cathode of the
light emitting micro diodes 228h is electrically connected to the
second conductive electrode 208. Thus, each light emitting micro
diodes 228 of the light emitting unit 210a is coupled in a forward
conduction direction from the first conductive electrode 206 to the
second conductive electrode 208. Similarly, the light emitting unit
210b is composed of eight light emitting micro diodes 228. Each
light emitting micro diodes 228 of the light emitting unit 210b is
coupled in a forward conduction direction from the second
conductive electrode 208 to the first conductive electrode 206.
[0020] As shown in FIG. 2a, the portion 204 of the AC LED unit chip
250a comprises a second light emitting module 216 electrically
connected the third conductive electrode 212 and a fourth
conductive electrode 214. The second light emitting module 216 may
have the same circuitry design as the light emitting modules 210.
The second light emitting module 216 comprises two light emitting
units 216a and 216b, parallel connected, wherein the light emitting
unit 216a is composed of eight light emitting micro diodes 228
connected in series. Each light emitting micro diodes 228 of the
light emitting unit 216a is coupled in a forward conduction
direction from the fourth conductive electrode 214 to the third
conductive electrode 212. Similar to the light emitting unit 216a,
the light emitting unit 216b is composed of eight light emitting
micro diodes 228 connected in series. Each light emitting micro
diodes 228 of the light emitting unit 216b is coupled in a forward
conduction direction from the third conductive electrode 212 to the
fourth conductive electrode 214.
[0021] The described circuitry design of the light emitting module
having two light emitting units allows the amount of light emitting
micro diodes emitting light during a positive half cycle of an AC
charge to equal to that during a negative half cycle of an AC
charge. For example, if the AC LED unit chip 250a is coupled to an
AC power supply, the light emitting module 210 allows the eight
light emitting micro diodes of the light emitting unit 210a to emit
light during a positive half cycle of an AC charge by the AC power
supply and allows the eight light emitting micro diodes of the
light emitting unit 210b to emit light during a negative half cycle
of an AC charge by the AC power supply.
[0022] Generally, a driving voltage of a light emitting micro diode
is about 5V. Therefore, a driving voltage of the light emitting
modules 210 or 216 composed of eight light emitting micro diodes is
about 40V. If the AC LED unit chips of the AC LED device 500a as
shown the FIG. 1 are composed of the four AC LED unit chips 250, a
driving voltage of each AC LED unit chips 250 is about 40V, and a
peak voltage (Vp) of the AC LED device 500a is about 160V.
Therefore, the AC power supply 222a has a root mean square voltage
(Vrms) of about 110V. Thus, a connection type of the AC LED device
500a may receive 110 Vrms by an AC power supply, and ten conductive
wires are needed.
[0023] In one embodiment, each light emitting module of each
portion of the AC LED unit chip 250a may have the same circuitry
design and the same amount of light emitting micro diodes.
Additionally, each light emitting unit of the same light emitting
module may have the same amount of light emitting micro diodes.
Alternatively, the amount of light emitting micro diodes of each
light emitting unit is according to design, but not limited to the
disclosure herein. For example, each light emitting unit of the AC
LED unit chip 250a may have five to twelve light emitting micro
diodes. Therefore, the light emitting module of the AC LED unit
chip 250a would allow for five to twelve of the light emitting
micro diodes to emit light during a positive half cycle of an AC
charge, and the same amount for a negative half cycle of an AC
charge. A driving voltage of the AC LED unit chip 250a is also
according to design, but not limited to the disclosure herein.
[0024] In another embodiment, the amount of light emitting units of
each light emitting module of the AC LED unit chip is not limited.
FIG. 2b shows a circuitry design of another embodiment of light
emitting modules 210 and 216 of an AC LED unit chip 250b of the
present disclosure. In one embodiment, a driving voltage of the
light emitting modules 210 or 216 of the AC LED unit chip 250b is
about 40V. Alternatively, a driving voltage of the light emitting
module of the AC LED unit chip 250b is according to design, but not
limited to the disclosure herein. The first light emitting module
210 is electrically connected to the first conductive electrode 206
and the second conductive electrode 208. The first light emitting
module 210 comprises eight light emitting units 210c to 210j series
connected. Each light emitting unit, for example, the light
emitting unit 210c, is composed of two light emitting micro diodes
230, for example, light emitting micro diodes 230a and 230b,
parallel connected. The light emitting micro diodes 230a of the
light emitting unit 210c is coupled in a forward conduction
direction from the first conductive electrode 206 to the second
conductive electrode 208, but the light emitting micro diodes 230b
of the light emitting unit 210c is coupled in a forward conduction
direction from the second conductive electrode 208 to the first
conductive electrode 206. In one embodiment, the eight light
emitting units 210c to 210j may have the same circuitry design.
[0025] As shown in FIG. 2b, the portion 204 of the AC LED unit chip
250b comprises a second light emitting module 216 electrically
connected to the third conductive electrode 212 and the fourth
conductive electrode 214. The second light emitting module 216 may
have the same circuitry design as the light emitting modules 210.
Also, the second light emitting module 216 comprises eight light
emitting units 216c to 216j series connected from the third
conductive electrode 212 to the fourth conductive electrode 214.
Each light emitting unit 216 is composed of two light emitting
micro diodes 230, parallel connected. One of the light emitting
micro diodes 230 of the light emitting units 216 is coupled in a
forward conduction direction from the third conductive electrode
212 to the fourth conductive electrode 214, but another one of the
light emitting micro diodes 230 of the same light emitting units
216 is coupled in a forward conduction direction from the fourth
conductive electrode 214 to the third conductive electrode 212. In
this embodiment, each light emitting module of each portion of the
AC LED unit chip 250b may have the same circuitry design and the
same amount of light emitting micro diodes. Each light emitting
unit of the same light emitting module may have the same amount of
light emitting micro diodes. and the amount of the light emitting
units of each portion of the AC LED unit chip 250b is according to
design, but not limited to the disclosure herein. For example, each
light emitting module of the AC LED unit chip 250b may have five to
twelve light emitting units. In this embodiment, the light emitting
module allows the amount of light emitting micro diodes to emit
light during a positive half cycle of an AC charge is equal to that
during a negative half cycle of an AC charge. For example, the
light emitting module would allow five to twelve of the light
emitting micro diodes to emit light during a positive half cycle of
an AC charge, and the same amount for a negative half cycle of an
AC charge. Additionally, the two light emitting micro diodes of one
light emitting unit may alternatively emit light during a positive
and a negative half cycle of an AC charge. For example, the light
emitting micro diodes 230a of the light emitting unit 210c may emit
light if the first conductive electrode 206 receives a positive
half cycle of an AC charge, and light emitting micro diodes 230b
may emit light if the first conductive electrode 206 receives a
negative half cycle of an AC charge.
[0026] FIGS. 3a to 3c show circuitry designs of exemplary
embodiments of an AC LED unit chip of the present disclosure. In
embodiments as shown in FIGS. 3a to 3c, a light emitting module may
be composed of one or more bridge light emitting units, wherein a
circuit structure of the light emitting micro diodes of each bridge
light emitting unit is arranged according to a bridge rectifier.
Also, a driving voltage of each light emitting module of each AC
LED unit chip as shown in FIGS. 3a to 3c is about 40V.
Alternatively, a driving voltage of each light emitting module of
each AC LED unit chip as shown in FIGS. 3a to 3c is according to
design, but not limited to the disclosure herein.
[0027] FIG. 3a shows a circuitry design of one embodiment of bridge
light emitting units 234a and 236a of light emitting modules 210
and 216 of an AC LED unit chip 250c of the present disclosure. The
first light emitting module 210 comprises only one bridge light
emitting unit 234a. The bridge light emitting unit 234a has a
circuit configuration in a bridge rectifier composed of a first
circuit C1, a second circuit C2, a third circuit C3, a fourth
circuit C4 and a fifth circuit C5. As shown in FIG. 3a, each of the
first circuit C1, the second circuit C2, the fourth circuit C4 and
the fifth circuit C5 comprises one light emitting micro diode 232.
The third circuit C3 comprises six light emitting micro diodes 232
series connected. Similarly, the bridge light emitting unit 236a of
the second light emitting module 216 may have the same circuitry
design as the bridge light emitting unit 234a of the light emitting
modules 210. The bridge light emitting unit 236a has a circuit
configuration in a bridge rectifier composed of a first circuit C1,
a second circuit C2, a third circuit C3, a fourth circuit C4 and a
fifth circuit C5. In the bridge light emitting unit 236a, each of
the first circuit C1, the second circuit C2, the fourth circuit C4
and the fifth circuit C5 comprises one light emitting micro diode
232, respectively. The third circuit C3 comprises six light
emitting micro diodes 232 series connected. The described circuitry
design of the bridge light emitting unit 234a or 236a allows the
amount of light emitting micro diodes emitting light during a
positive half cycle of an AC charge to equal to that during a
negative half cycle of an AC charge. For example, if the first
conductive electrode 206 and the second conductive electrode 208 of
the AC LED unit chip 250c are coupled to an AC power supply, the
light emitting module 210 allows the eight light emitting micro
diodes 232, which comprise one light emitting micro diode 232 of
the second circuit C2, six light emitting micro diodes 232 of the
third circuit C3 and one light emitting micro diode of the fourth
circuit C4, to emit light during a positive half cycle of an AC
charge by the AC power supply, and the light emitting module 210
allows the eight light emitting micro diodes, which comprise one
light emitting micro diode 232 of the fifth circuit C5, six light
emitting micro diodes 232 of the third circuit C3 and one light
emitting micro diode 232 of the first circuit C1, to emit light
during a negative half cycle of an AC charge by the AC power
supply. If the third conductive electrode 212 and the fourth
conductive electrode 214 of the AC LED unit chip 250c are coupled
to an AC power supply, the light emitting module 216 allows the
eight light emitting micro diodes 232, which comprise one light
emitting micro diode 232 of the second circuit C2, six light
emitting micro diodes 232 of the third circuit C3 and one light
emitting micro diode 232 of the fourth circuit C4, to emit light
during a positive half cycle of an AC charge by the AC power
supply, and the light emitting module 216 allows the eight light
emitting micro diodes 232, which comprise one light emitting micro
diode 232 of the fifth circuit C5, six light emitting micro diodes
232 of the third circuit C3 and one light emitting micro diode 232
of the first circuit C1, to emit light during a negative half cycle
of an AC charge by the AC power supply. Therefore, in the bridge
light emitting units 234a or 236a, the light emitting micro diodes
232 of the third circuit C3 may emit light during a positive or
negative half cycle of an AC charge. Additionally, the light
emitting micro diodes 232 of the first, second, fourth and fifth
circuits C1, C2, C4 and C5 may alternatively emit light during a
positive or negative half cycle of an AC charge.
[0028] Alternatively, the light emitting micro diodes of each
circuit of the bridge light emitting unit may have various designs,
which would only allow the amount of light emitting micro diodes
emitting light during a positive half cycle of an AC charge to
equal to that during a negative half cycle of an AC charge. FIG. 3b
shows a circuitry design of another embodiment of bridge light
emitting units 234b and 236b of light emitting modules 210 and 216
of an AC LED unit chip 250d of the present disclosure. As shown in
FIG. 3b, a first circuit C1, a second circuit C2, a fourth circuit
C4 and a fifth circuit C5 of the bridge light emitting units 234b
comprise three light emitting micro diodes 232 series connected,
respectively. A third circuit C3 comprises two light emitting micro
diodes 232 series connected. Similarly, the bridge light emitting
unit 236b of the second light emitting module 216 may have the same
circuitry design as the bridge light emitting unit 234b of the
light emitting modules 210. Therefore, the described circuitry
design of the bridge light emitting unit 234b of the light emitting
module 210 allows the eight light emitting micro diodes 232, which
comprise three light emitting micro diodes 232 of the second
circuit C2, two light emitting micro diodes 232 of the third
circuit C3 and three light emitting micro diodes 232 of the fourth
circuit C4, to emit light during a positive half cycle of an AC
charge, and the bridge light emitting unit 234b allows the eight
light emitting micro diodes 232, which comprise three light
emitting micro diodes 232 of the fifth circuit C5, two light
emitting micro diodes 232 of the third circuit C3 and three light
emitting micro diodes 232 of the first circuit C1, to emit light
during a negative half cycle of an AC charge.
[0029] Also, the described circuitry design of the bridge light
emitting unit 236b of the light emitting module 216 allows the
eight light emitting micro diodes 232, which comprise three light
emitting micro diodes 232 of the second circuit C2, two light
emitting micro diodes 232 of the third circuit C3 and three light
emitting micro diodes 232 of the fourth circuit C4, to emit light
during a positive half cycle of an AC charge, and the bridge light
emitting unit 236b of the light emitting module 216 allows the
eight light emitting micro diodes 232, which comprise three light
emitting micro diodes 232 of the fifth circuit C5, two light
emitting micro diodes 232 of the third circuit C3 and three light
emitting micro diodes 232 of the first circuit C1, to emit light
during a negative half cycle of an AC charge.
[0030] Also, in the bridge light emitting units 234b or 236b, the
light emitting micro diodes 232 of the third circuit C3 may emit
light during a positive or negative half cycle of an AC charge.
Additionally, the light emitting micro diodes 232 of the first,
second, fourth and fifth circuits C1, C2, C4 and C5 may
alternatively emit light during a positive or negative half cycle
of an AC charge.
[0031] In other embodiments, the light emitting module may be
composed of a plurality of the bridge light emitting units. FIG. 3c
shows a circuitry design of another embodiment of bridge light
emitting units 234c, 234d, 236c and 236d of light emitting modules
210 and 216 of an AC LED unit chip 250e of the present disclosure.
The first light emitting module 210 comprises two bridge light
emitting units 234c and 234d series connected from the first
conductive electrode 206 to the second conductive electrode 208.
Each of the bridge light emitting units 234c and 234d has a circuit
configuration in a bridge rectifier composed of a first circuit C1,
a second circuit C2, a third circuit C3, a fourth circuit C4 and a
fifth circuit C5. As shown in FIG. 3c, each of the first circuit
C1, the second circuit C2, the fourth circuit C4 and the fifth
circuit C5 comprises one light emitting micro diode 232. The third
circuit C3 comprises two light emitting micro diodes 232 series
connected. Similarly, the bridge light emitting units 236c and 236d
of the second light emitting module 216 may have the same circuitry
design as the bridge light emitting units 234c and 234d of the
light emitting modules 210. Therefore, the described circuitry
design of the light emitting module 210 comprising the bridge light
emitting units 234c and 234d allows the eight light emitting micro
diodes 232, which comprise one light emitting micro diode 232 of
the second circuit C2 of the bridge light emitting units 234c and
234d, two light emitting micro diodes 232 in the third circuit C3
of the bridge light emitting units 234c and 234d and one light
emitting micro diode 232 in the fourth circuit C4 of the bridge
light emitting units 234c and 234d, to emit light during a positive
half cycle of an AC charge, and the bridge light emitting units
234c and 234d allow the eight light emitting micro diodes 232,
which comprise one light emitting micro diode 232 of the fifth
circuit C5 of the bridge light emitting units 234c and 234d, two
light emitting micro diodes 232 of the third circuit C3 of the
bridge light emitting units 234c and 234d and one light emitting
micro diode 232 of the first circuit C1 of the bridge light
emitting units 234c and 234d, to emit light during a negative half
cycle of an AC charge.
[0032] Also, the described circuitry design of the light emitting
module 216 comprising the bridge light emitting units 236c and 236d
allows the eight light emitting micro diodes 232, which comprise
one light emitting micro diodes 232 of the second circuit C2 of the
bridge light emitting units 236c and 236d, two light emitting micro
diodes 232 in the third circuit C3 of the bridge light emitting
units 236c and 236d and one light emitting micro diodes 232 in the
fourth circuit C4 of the bridge light emitting units 236c and 236d,
to emit light during a positive half cycle of an AC charge, and the
bridge light emitting units 236c and 236d allows the eight light
emitting micro diodes 232, which comprise one light emitting micro
diodes 232 in the fifth circuit C5 of the bridge light emitting
units 236c and 236d, two light emitting micro diodes 232 in the
third circuit C3 of the bridge light emitting units 236c and 236d
and one light emitting micro diodes 232 in the first circuit C1 of
the bridge light emitting units 236c and 236d, to emit light during
a negative half cycle of an AC charge.
[0033] Also, in the bridge light emitting units 234c, 234d, 236c or
236d, the light emitting micro diodes 232 of the third circuit C3
may emit light during a positive or negative half cycle of an AC
charge. Additionally, the light emitting micro diodes 232 of the
first, second, fourth and fifth circuits C1, C2, C4 and C5 may
alternatively emit light during a positive or negative half cycle
of an AC charge.
[0034] The described circuitry design of the light emitting module
composed of one or more bridge light emitting units allows the
amount of light emitting micro diodes emitting light during a
positive half cycle of an AC charge to equal to that during a
negative half cycle of an AC charge. The amount of the bridge light
emitting units of each light emitting module is according to
design, but not limited to the disclosure herein. Also, the amount
of the light emitting micro diodes of each circuit of each bridge
light emitting unit is according to design, but not limited to the
disclosure herein. For example, each bridge light emitting unit of
the AC LED unit chip may allow five to twelve light emitting micro
diodes to emit light during a positive half cycle and a negative
half cycle of an AC charge, and all the light emitting micro diodes
in the third C3 of the bridge light emitting unit may emit light
during a positive and negative half cycles of an AC charge.
[0035] The described AC LED unit chips may have various connection
types to form an AC LED device, receiving different applied
voltages by an AC power supply. FIGS. 4a to 4c show other exemplary
embodiments of an AC LED device of the present disclosure. In one
embodiment, a driving voltage of each light emitting module of each
AC LED unit chip as shown in FIGS. 4a to 4c is about 40V.
Alternatively, a driving voltage of each light emitting module of
each AC LED unit chip as shown in FIGS. 4a to 4c is according to
design, but not limited to the disclosure herein. As shown in FIG.
4a, the AC LED device 500b comprises a plurality of separated AC
LED unit chips 250, for example, AC LED unit chips 252, 254, 256
and 258. In one embodiment, the AC LED unit chips 252, 254, 256 and
258 may be the same AC LED unit chip. The light emitting modules
210 and 216 of the light emitting unit chips 252, 254, 256 or 258
may have the same circuitry designs, which are shown in FIGS. 2a to
2b and 3a to 3c. A plurality of conductive wires are used to
electrically connect the light emitting unit chips 252, 254, 256 or
258, the node 220 and an AC power supply 222b to each other to form
the AC LED device 500b. As shown in FIG. 4a, a conductive wire 224a
is electrically connected to the node 220 and the first conductive
electrode 206 of the AC LED unit chip 252. Conductive wires 224b,
224d, 224f and 224h are respectively and electrically connected to
the second conductive electrodes 208 of the AC LED unit chips 252,
254, 256 and 258 and the fourth conductive electrodes 214 of the
same AC LED unit chips 252, 254, 256 and 258. Conductive wires
224c, 224e and 224g are respectively and electrically connected to
the third conductive electrodes 212 of the AC LED unit chips 252,
254 and 256 and the first conductive electrodes 206 of the adjacent
AC LED unit chips 254, 256 and 258. A conductive wire 224i is
electrically connected to the third conductive electrodes 212 of
the AC LED unit chip 258 and the AC power supply 222b. As shown in
FIG. 4a, the AC LED unit chips 252, 254, 256 and 258 are series
connected from the AC power supply 222b to the node 220 with the
light emitting modules 210 and 216 of each AC LED unit chips 252,
254, 256 and 258 series connected. Therefore, the AC LED device
500b is formed. As mentioned before, driving voltages of the light
emitting modules 210 and 216 of each AC LED unit chips 252, 254,
256 and 258 are about 40V, and a peak voltage (Vp) of the AC LED
device 500b is about 320V. Therefore, the AC power supply 222b may
have a root mean square voltage (Vrms) of about 220V. That is to
say, a connection type of the AC LED device 500b may receive
220Vrms of applied voltage by an AC power supply, and nine
conductive wires are needed.
[0036] FIG. 4b show a connection type of another exemplary
embodiment of an AC LED device 500c of the present disclosure. As
shown in FIG. 4b, the AC LED device 500c comprises a plurality of
separated AC LED unit chips 260, for example, AC LED unit chips
262, 264, 266 and 268. In one embodiment, the AC LED unit chips
262, 264, 266 and 268 may be the same AC LED unit chip. FIG. 5
shows a circuitry design of one exemplary embodiment of an AC LED
unit chip 262 as shown in FIGS. 4b and 4c. The light emitting
modules 310 and 316 of the light emitting unit chips 262 may have
the same circuitry designs as the light emitting modules 210 and
216 as shown in FIG. 3c. Alternatively, the light emitting modules
310 and 316 of the light emitting unit chips 262 may have the same
circuitry designs as the light emitting modules 210 and 216 as
shown in FIGS. 2a to 2b, 3a and 3b, but not limited to the
disclosure herein. As shown in FIG. 5, it is noted that the light
emitting modules 310 and 316 of the same light emitting unit chip
262 share the same conductive electrode 306. As shown in FIG. 4b,
the light emitting modules 310 and 316 of the same light emitting
unit chip, for example, the light emitting unit chip 262, share the
same conductive electrode, for example, the first conductive
electrode 306. Therefore, the node 220 is electrically connected to
the light emitting modules 310 and 316 by only one conductive wire
through the first conductive electrode 306 shared by the light
emitting modules 310 and 316. Thus, because the amount of
conductive wires is reduced, so may costs. Additionally, the light
emitting modules 310 and 316 of the light emitting unit chips 262,
264, 266 or 268 may have the same circuitry designs. A plurality of
conductive wires are used to electrically connect the light
emitting unit chips 262, 264, 266 or 268, the node 220 and an AC
power supply 222c to each other to form the AC LED device 500b. A
conductive wire 226a is respectively and electrically connected to
the node 220 and the first conductive electrode 306 of the AC LED
unit chip 262. Conductive wires 226b and 226e are respectively and
electrically connected to the second conductive electrodes 308 of
the AC LED unit chips 262 and 266 and third conductive electrodes
314 of the adjacent AC LED unit chips 264 and 268. Conductive wires
226c and 226f are respectively and electrically connected to third
conductive electrodes 314 of the AC LED unit chips 262 and 266 and
second conductive electrodes 308 of the adjacent AC LED unit chips
264 and 268. A conductive wire 226d is electrically connected to
the first conductive electrodes 306 of the AC LED unit chip 264 and
the adjacent AC LED unit chip 266. A conductive wire 226g is
electrically connected to the first conductive electrodes 306 of
the AC LED unit chip 268 and the AC power supply 222c. As shown in
FIG. 4b, an LED module chain is formed by connecting the light
emitting module 316 of the AC LED unit chip 262, the light emitting
module 310 of the AC LED unit chip 264, the light emitting module
316 of the AC LED unit chip 266 and the light emitting module 310
of the AC LED unit chip 268 in series. Another LED module chain is
formed by connecting the light emitting module 310 of the AC LED
unit chip 262, the light emitting module 316 of the AC LED unit
chip 264, the light emitting module 310 of the AC LED unit chip 266
and the light emitting module 316 of the AC LED unit chip 268 in
series. The described two LED module chains are, parallel connected
between the node 220 and the AC power supply 222b. Therefore, the
AC LED device 500c is formed. As mentioned before, driving voltages
of the light emitting modules 310 and 316 of each AC LED unit chips
262, 264, 266 and 268 are about 40V, and a peak voltage (Vp) of the
AC LED device 500c is about 160V. Therefore, the AC power supply
222c may have a root mean square voltage (Vrms) of about 110V. That
is to say, a connection type of the AC LED device 500c may receive
110Vrms applied voltage by an AC power supply, and seven conductive
wires are needed. When compared with the connection type of the AC
LED device 500a as shown in FIG. 1, the AC LED device 500c has less
conductive wires. Therefore, the AC LED device 500c may have a
lower fabricating cost than the AC LED device 500a.
[0037] FIG. 4c show a connection type of another exemplary
embodiment of an AC LED device 500d of the present disclosure.
Also, FIG. 5 shows a circuitry design of one exemplary embodiment
of an AC LED unit chip 262 as shown in FIGS. 4b and 4c. The light
emitting modules 310 and 316 of the light emitting unit chips 262
may have the same circuitry designs as the light emitting modules
210 and 216 as shown in FIG. 3c. Alternatively, the light emitting
modules 310 and 316 of the light emitting unit chips 262 may have
the same circuitry designs as the light emitting modules 210 and
216 as shown in FIGS. 2a to 2b, 3a and 3b, but not limited to the
disclosure herein. Similar to the AC LED device 500c, the light
emitting modules 310 and 316 of the same light emitting unit chips
262, 264, 266 or 268 share the same conductive electrode 306.
Therefore, the light emitting modules 310 and 316 of the same light
emitting unit chip, for example, the light emitting unit chip 262,
may be series connected without conductive wires. The cost of the
conductive wires may be reduced. A plurality of conductive wires
are used to electrically connect the light emitting unit chips 262,
264, 266 or 268, the node 220 and an AC power supply 222d to each
other to form the AC LED device 500d. As shown in FIG. 4c, a
conductive wire 228a is electrically connected to the node 220 and
the third conductive electrode 314 of the AC LED unit chip 262.
Conductive wires 228b, 228c and 228d are respectively and
electrically connected to the second conductive electrodes 308 of
the AC LED unit chips 262, 264 and 266 and the third conductive
electrodes 314 of the adjacent AC LED unit chips 264, 266 and 268.
A conductive wire 228e is electrically connected to the second
conductive electrodes 308 of the AC LED unit chip 268 and an AC
power supply 222d. Similar to the AC LED device 500b, the AC LED
unit chips 262, 264, 266 and 268 are series connected from the AC
power supply 222d to the node 220 with the light emitting modules
310 and 316 of each AC LED unit chips 262, 264, 266 and 268 series
connected. Therefore, the AC LED device 500d is formed. As
mentioned before, driving voltages of the light emitting modules
210 and 216 of each AC LED unit chips 252, 254, 256 and 258 are
about 40V, and a peak voltage (Vp) of the AC LED device 500d is
about 320V. Therefore, the AC power supply 222b may have a root
mean square voltage (Vrms) of about 220V. That is to say, a
connection type of the AC LED device 500d may receive 220Vrms
applied voltage by an AC power supply, and five conductive wires
are needed. When compared with the connection type of the AC LED
device 500b as shown in FIG. 4a, the AC LED device 500d has less
conductive wires. Therefore, the AC LED device 500d may have a
lower fabricating cost than the AC LED device 500b.
[0038] The described AC LED device connection types, as shown in
FIGS. 1, 4a to 4c, are formed by connecting each light emitting
module of each AC LED unit chips in a series or a parallel
connection. Alternatively, the amount of AC LED unit chips is
according to design to receive different root mean square applied
voltages, for example, 90Vrms, 100Vrms, 110Vrms, 132Vrms, 150Vrms,
162Vrms, 240Vrms or 264Vrms. Additionally, each light emitting
module of each AC LED unit chip may have various designs to have
different driving voltages. Therefore, the AC LED unit chip
composed of the light emitting modules may receive different
applied voltages.
[0039] FIG. 6 shows a process chart of fabricating one exemplary
embodiment of an AC LED device of the present disclosure. As shown
in step 1610, the step of fabricating the AC LED device comprises
fabricating the light emitting unit chips. As shown in step 1620,
the light emitting unit chips are sorted by measuring their driving
voltages. As shown in step 1630, the sorted light emitting unit
chips are selected to compose an AC LED device that receives a
predetermined voltage. As shown in step 1640, the selected and
sorted light emitting unit chips are connected to each other by
bonding conductive wires to form an AC LED device that receives a
predetermined voltage. For example, if the driving voltage levels
of the sorted light emitting unit chips comprise 36Vrms, 40Vrms and
44Vrms. an AC LED unit chip receiving 160Vrms driving voltage may
be composed by connecting two light emitting unit chips of 36Vrms
driving voltage and two light emitting unit chips of 44Vrms driving
voltage. In another embodiment, the AC LED unit chip receiving
160Vrms driving voltage may be composed by connecting one light
emitting unit chip of 36Vrms driving voltage, one light emitting
unit chip of 44Vrms driving voltage and two light emitting unit
chips of 40Vrms driving voltage. Alternatively, the AC LED unit
chip receiving 160Vrms driving voltage may be composed by
connecting four light emitting unit chips of 40Vrms driving
voltage, but not limited to the disclosure herein. When compared
with the conventional AC LED device, whereby all LEDs are arranged
in one chip to receive a specific voltage, one exemplary embodiment
of an AC LED device composed of one or more AC LED unit chips may
receive different applied voltages without requirement to change
circuitry designs. Additionally, exemplary embodiments of the AC
LED unit chips have smaller driving voltage variations. The AC LED
unit chips may be selected and sorted to compose an AC LED device,
whereby a predetermined voltage receives and no passive device to
adjust applied voltages is required.
[0040] While the present disclosure has been described by way of
example and in terms of the preferred embodiments, it is to be
understood that the present disclosure is not limited to the
disclosed embodiments. To the contrary, it is intended to cover
various modifications and similar arrangements (as would be
apparent to those skilled in the art). Therefore, the scope of the
appended claims should be accorded the broadest interpretation so
as to encompass all such modifications and similar
arrangements.
* * * * *