U.S. patent application number 15/749303 was filed with the patent office on 2019-05-30 for goa circuit, liquid crystal panel and display device.
The applicant listed for this patent is Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.. Invention is credited to Qiang GONG.
Application Number | 20190163001 15/749303 |
Document ID | / |
Family ID | 66632329 |
Filed Date | 2019-05-30 |
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United States Patent
Application |
20190163001 |
Kind Code |
A1 |
GONG; Qiang |
May 30, 2019 |
GOA CIRCUIT, LIQUID CRYSTAL PANEL AND DISPLAY DEVICE
Abstract
A GOA circuit comprises a plurality of GOA structural units
connected in cascade, and each GOA structural unit outputs a line
scanning signal to a corresponding one line of pixel units. An Nth
stage GOA structural unit comprises a forward-reverse scan control
module, a node signal control input module, an output control
module, a voltage-stabilizing module, a node Q pull-down module, a
node P pull-down module, a gate signal pull-down module, a GAS
signal function module and a self-lifting capacitor. A gate of a
first TFT of the voltage-stabilizing module receives a third GAS
signal, a source thereof is connected to the forward-reverse scan
control module and the node Q pull-down module, and a drain thereof
is connected to the first node. The third GAS signal is VGH signal
during the scan period of the touch panel, and is a VGL signal in a
suspending period of the touch panel.
Inventors: |
GONG; Qiang; (Wuhan, Hubei,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Wuhan China Star Optoelectronics Semiconductor Display Technology
Co., Ltd. |
Wuhan, Hubei |
|
CN |
|
|
Family ID: |
66632329 |
Appl. No.: |
15/749303 |
Filed: |
January 2, 2018 |
PCT Filed: |
January 2, 2018 |
PCT NO: |
PCT/CN2018/070020 |
371 Date: |
January 31, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G06F 3/0412 20130101;
G02F 1/13454 20130101; G09G 2310/08 20130101; G02F 1/13306
20130101; G09G 3/36 20130101; G06F 3/0416 20130101; G09G 2310/0264
20130101; H01L 27/1214 20130101; G09G 2310/0286 20130101; G02F
1/13338 20130101 |
International
Class: |
G02F 1/1333 20060101
G02F001/1333; H01L 27/12 20060101 H01L027/12; G02F 1/133 20060101
G02F001/133; G09G 3/36 20060101 G09G003/36; G06F 3/041 20060101
G06F003/041 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 28, 2017 |
CN |
201711217027.6 |
Claims
1. A GOA (Gate Driver on Array) circuit, comprising a plurality of
GOA structural units connected in cascade, wherein each one stage
of the GOA structural units outputs a line scanning signal to a
corresponding one line of pixel units within a display area of a
display panel in accordance with what is done by a Nth stage GOA
structural unit of the GOA structural units; wherein, the Nth stage
GOA structural unit comprises a forward-reverse scan control module
for controlling the GOA circuit to scan forwardly or inversely by
using a forward direct-current scan control signal and a reverse
direct-current scan control signal; a node signal control input
module for outputting a low-level potential in a non-working stage
of the GOA circuit; an output control module for controlling output
of a gate driving signal; a voltage-stabilizing module for
maintaining a potential of a first node; a node Q pull-down module
for pulling down the potential of the first node; a node P
pull-down module for pulling down a potential of a second node; a
gate signal pull-down module for pulling down a potential of a
current-stage gate driving signal and controlling output of the
current-stage gate driving signal during a scan period of a touch
panel; a GAS signal function module for turning on all gate driving
signals of the GOA circuit and controlling output of the
current-stage gate driving signal during the scan period of the
touch panel by using a first GAS signal and a second GAS signal;
and a self-lifting capacitor for a second lifting of the potential
of the first node, and N is a positive integer; wherein, the
voltage-stabilizing module comprises a first thin film transistor
(TFT), wherein a gate of the first TFT receives a third GAS signal,
a source of the first TFT is connected to both the forward-reverse
scan control module and the node Q pull-down module, and a drain of
the first TFT is connected to the first node; wherein the third GAS
signal is a signal with a constant high-level potential during the
scan period of the touch panel, and is a signal with a constant
low-level potential in a suspending period of the touch panel.
2. The GOA circuit according to claim 1, wherein the
forward-reverse scan control module comprises a second TFT and a
third TFT; wherein, a gate of the second TFT receives a
current-stage gate driving signal of a (N-2)th stage GOA structural
unit of the GOA structural units, a source of the second TFT
receives the forward direct-current scan control signal, and a
drain of the second TFT is connected to both the source of the
first TFT of the voltage-stabilizing module and a drain of the
third TFT; a gate of the third TFT receives a current-stage gate
driving signal of a (N+2)th stage GOA structural unit of the GOA
structural units, and a source of the third TFT receives the
reverse direct-current scan control signal.
3. The GOA circuit according to claim 2, wherein the node signal
control input module comprises a fourth TFT, a fifth TFT and a
sixth TFT; wherein, a gate of the fourth TFT receives the forward
direct-current scan control signal, a source of the fourth TFT
receives a current-stage clock signal of a (N+1)th stage GOA
structural unit of the GOA structural units, and a drain of the
fourth TFT is connected to a drain of the fifth TFT and a gate of
the sixth TFT; a gate of the fifth TFT receives the reverse
direct-current scan control signal, and a source of the fifth TFT
receives a current-stage clock signal of a (N-1)th stage GOA
structural unit of the GOA structural units; a source of the sixth
TFT receives the signal with the constant high-level potential, and
a drain of the sixth TFT is connected to the second node connected
to the node Q pull-down module, the node P pull-down module, the
gate signal pull-down module and the GAS signal function
module.
4. The GOA circuit according to claim 3, wherein the output control
module comprises a seventh TFT, and a gate of the seventh TFT is
connected to the first node, a source of the seventh TFT receives a
current-stage clock signal of the Nth stage GOA structural unit,
and a drain of the seventh TFT receives the current-stage gate
driving signal of the Nth stage GOA structural unit.
5. The GOA circuit according to claim 4, wherein the node Q
pull-down module comprises an eighth TFT, and a gate of the eighth
TFT is connected to the second node, a source of the eighth TFT
receives the signal with the constant low-level potential, and a
drain of the eighth TFT is connected to the source of the first TFT
of the voltage-stabilizing module and is connected to the first
node through the first TFT.
6. The GOA circuit according to claim 5, wherein the node P
pull-down module comprises a ninth TFT, and a gate of the ninth TFT
is connected to both the drains of the second TFT and the third TFT
of the forward-reverse scan control module, a source of the ninth
TFT receives the signal with the constant low-level potential, and
a drain of the ninth TFT is connected to the second node.
7. The GOA circuit according to claim 6, wherein the gate signal
pull-down module comprises a tenth TFT, and a gate of the tenth TFT
is connected to the second node, a source of the tenth TFT receives
the signal with the constant low-level potential, and a drain of
the tenth TFT receives the current-stage gate driving signal of the
Nth stage GOA structural unit.
8. The GOA circuit according to claim 7, wherein the GAS signal
function module comprises an eleventh TFT, a twelfth TFT and a
thirteenth TFT; wherein, a gate of the eleventh TFT receives the
first GAS signal, a source of the eleventh TFT receives the signal
with the constant low-level potential, and a drain of the eleventh
TFT is connected to the second node; a gate of the twelfth TFT
receives the first GAS signal and is short-connected to a source of
the twelfth TFT, and a drain of the twelfth TFT receives the
current-stage gate driving signal of the Nth stage GOA structural
unit; a gate of the thirteenth TFT receives the second GAS signal,
a source of the thirteenth TFT receives the signal with the
constant low-level potential, and a drain of the thirteenth TFT
receives the current-stage gate driving signal of the Nth stage GOA
structural unit.
9. A liquid crystal panel, comprising a GOA circuit comprising a
plurality of GOA structural units connected in cascade, wherein
each one stage of the GOA structural units outputs a line scanning
signal to a corresponding one line of pixel units within a display
area of a display panel in accordance with what is done by a Nth
stage GOA structural unit of the GOA structural units; wherein, the
Nth stage GOA structural unit comprises a forward-reverse scan
control module for controlling the GOA circuit to scan forwardly or
inversely by using a forward direct-current scan control signal and
a reverse direct-current scan control signal; a node signal control
input module for outputting a low-level potential in a non-working
stage of the GOA circuit; an output control module for controlling
output of a gate driving signal; a voltage-stabilizing module for
maintaining a potential of a first node; a node Q pull-down module
for pulling down the potential of the first node; a node P
pull-down module for pulling down a potential of a second node; a
gate signal pull-down module for pulling down a potential of a
current-stage gate driving signal and controlling output of the
current-stage gate driving signal during a scan period of a touch
panel; a GAS signal function module for turning on all gate driving
signals of the GOA circuit and controlling output of the
current-stage gate driving signal during the scan period of the
touch panel by using a first GAS signal and a second GAS signal;
and a self-lifting capacitor for a second lifting of the potential
of the first node, and N is a positive integer; wherein, the
voltage-stabilizing module comprises a first thin film transistor
(TFT), wherein a gate of the first TFT receives a third GAS signal,
a source of the first TFT is connected to both the forward-reverse
scan control module and the node Q pull-down module, and a drain of
the first TFT is connected to the first node; wherein the third GAS
signal is a signal with a constant high-level potential during the
scan period of the touch panel, and is a signal with a constant
low-level potential in a suspending period of the touch panel.
10. The liquid crystal panel according to claim 9, wherein the
forward-reverse scan control module comprises a second TFT and a
third TFT; wherein, a gate of the second TFT receives a
current-stage gate driving signal of a (N-2)th stage GOA structural
unit of the GOA structural units, a source of the second TFT
receives the forward direct-current scan control signal, and a
drain of the second TFT is connected to both the source of the
first TFT of the voltage-stabilizing module and a drain of the
third TFT; a gate of the third TFT receives a current-stage gate
driving signal of a (N+2)th stage GOA structural unit of the GOA
structural units, and a source of the third TFT receives the
reverse direct-current scan control signal.
11. The liquid crystal panel according to claim 10, wherein the
node signal control input module comprises a fourth TFT, a fifth
TFT and a sixth TFT; wherein, a gate of the fourth TFT receives the
forward direct-current scan control signal, a source of the fourth
TFT receives a current-stage clock signal of a (N+1)th stage GOA
structural unit of the GOA structural units, and a drain of the
fourth TFT is connected to a drain of the fifth TFT and a gate of
the sixth TFT; a gate of the fifth TFT receives the reverse
direct-current scan control signal, and a source of the fifth TFT
receives a current-stage clock signal of a (N-1)th stage GOA
structural unit of the GOA structural units; a source of the sixth
TFT receives the signal with the constant high-level potential, and
a drain of the sixth TFT is connected to the second node connected
to the node Q pull-down module, the node P pull-down module, the
gate signal pull-down module and the GAS signal function
module.
12. The liquid crystal panel according to claim 11, wherein the
output control module comprises a seventh TFT, and a gate of the
seventh TFT is connected to the first node, a source of the seventh
TFT receives a current-stage clock signal of the Nth stage GOA
structural unit, and a drain of the seventh TFT receives the
current-stage gate driving signal of the Nth stage GOA structural
unit.
13. The liquid crystal panel according to claim 12, wherein the
node Q pull-down module comprises an eighth TFT, and a gate of the
eighth TFT is connected to the second node, a source of the eighth
TFT receives the signal with the constant low-level potential, and
a drain of the eighth TFT is connected to the source of the first
TFT of the voltage-stabilizing module and is connected to the first
node through the first TFT.
14. The liquid crystal panel according to claim 13, wherein the
node P pull-down module comprises a ninth TFT, and a gate of the
ninth TFT is connected to both the drains of the second TFT and the
third TFT of the forward-reverse scan control module, a source of
the ninth TFT receives the signal with the constant low-level
potential, and a drain of the ninth TFT is connected to the second
node.
15. The liquid crystal panel according to claim 14, wherein the
gate signal pull-down module comprises a tenth TFT, and a gate of
the tenth TFT is connected to the second node, a source of the
tenth TFT receives the signal with the constant low-level
potential, and a drain of the tenth TFT receives the current-stage
gate driving signal of the Nth stage GOA structural unit.
16. The liquid crystal panel according to claim 15, wherein the GAS
signal function module comprises an eleventh TFT, a twelfth TFT and
a thirteenth TFT; wherein, a gate of the eleventh TFT receives the
first GAS signal, a source of the eleventh TFT receives the signal
with the constant low-level potential, and a drain of the eleventh
TFT is connected to the second node; a gate of the twelfth TFT
receives the first GAS signal and is short-connected to a source of
the twelfth TFT, and a drain of the twelfth TFT receives the
current-stage gate driving signal of the Nth stage GOA structural
unit; a gate of the thirteenth TFT receives the second GAS signal,
a source of the thirteenth TFT receives the signal with the
constant low-level potential, and a drain of the thirteenth TFT
receives the current-stage gate driving signal of the Nth stage GOA
structural unit.
17. A display device, comprising a liquid crystal panel comprising
a GOA circuit; wherein, the GOA circuit comprises a plurality of
GOA structural units connected in cascade, wherein each one stage
of the GOA structural units outputs a line scanning signal to a
corresponding one line of pixel units within a display area of a
display panel in accordance with what is done by a Nth stage GOA
structural unit of the GOA structural units; wherein, the Nth stage
GOA structural unit comprises a forward-reverse scan control module
for controlling the GOA circuit to scan forwardly or inversely by
using a forward direct-current scan control signal and a reverse
direct-current scan control signal; a node signal control input
module for outputting a low-level potential in a non-working stage
of the GOA circuit; an output control module for controlling output
of a gate driving signal; a voltage-stabilizing module for
maintaining a potential of a first node; a node Q pull-down module
for pulling down the potential of the first node; a node P
pull-down module for pulling down a potential of a second node; a
gate signal pull-down module for pulling down a potential of a
current-stage gate driving signal and controlling output of the
current-stage gate driving signal during a scan period of a touch
panel; a GAS signal function module for turning on all gate driving
signals of the GOA circuit and controlling output of the
current-stage gate driving signal during the scan period of the
touch panel by using a first GAS signal and a second GAS signal;
and a self-lifting capacitor for a second lifting of the potential
of the first node, and N is a positive integer; wherein, the
voltage-stabilizing module comprises a first thin film transistor
(TFT), wherein a gate of the first TFT receives a third GAS signal,
a source of the first TFT is connected to both the forward-reverse
scan control module and the node Q pull-down module, and a drain of
the first TFT is connected to the first node; wherein the third GAS
signal is a signal with a constant high-level potential during the
scan period of the touch panel, and is a signal with a constant
low-level potential in a suspending period of the touch panel.
18. The display device according to claim 17, wherein the
forward-reverse scan control module comprises a second TFT and a
third TFT; wherein, a gate of the second TFT receives a
current-stage gate driving signal of a (N-2)th stage GOA structural
unit of the GOA structural units, a source of the second TFT
receives the forward direct-current scan control signal, and a
drain of the second TFT is connected to both the source of the
first TFT of the voltage-stabilizing module and a drain of the
third TFT; a gate of the third TFT receives a current-stage gate
driving signal of a (N+2)th stage GOA structural unit of the GOA
structural units, and a source of the third TFT receives the
reverse direct-current scan control signal.
19. The display device according to claim 18, wherein the node
signal control input module comprises a fourth TFT, a fifth TFT and
a sixth TFT; wherein, a gate of the fourth TFT receives the forward
direct-current scan control signal, a source of the fourth TFT
receives a current-stage clock signal of a (N+1)th stage GOA
structural unit of the GOA structural units, and a drain of the
fourth TFT is connected to a drain of the fifth TFT and a gate of
the sixth TFT; a gate of the fifth TFT receives the reverse
direct-current scan control signal, and a source of the fifth TFT
receives a current-stage clock signal of a (N-1)th stage GOA
structural unit of the GOA structural units; a source of the sixth
TFT receives the signal with the constant high-level potential, and
a drain of the sixth TFT is connected to the second node connected
to the node Q pull-down module, the node P pull-down module, the
gate signal pull-down module and the GAS signal function
module.
20. The display device according to claim 19, wherein the output
control module comprises a seventh TFT, and a gate of the seventh
TFT is connected to the first node, a source of the seventh TFT
receives a current-stage clock signal of the Nth stage GOA
structural unit, and a drain of the seventh TFT receives the
current-stage gate driving signal of the Nth stage GOA structural
unit.
Description
RELATED APPLICATIONS
[0001] The present application is a National Phase of International
Application Number PCT/CN2018/070020, filed on Jan. 2, 2018, and
claims the priority of China Application No. 201711217027.6, filed
on Nov. 28, 2017.
FIELD OF THE DISCLOSURE
[0002] The disclosure relates to a liquid crystal display technical
field, and more particularly to a GOA (Gate Driver On Array)
circuit, liquid crystal panel and display device.
BACKGROUND
[0003] GOA technique drives scanning on a liquid crystal panel by
forming a gate line scan driving signal circuit on an array
substrate through the existed thin film transistor liquid crystal
display device array process. Compared with the conventional COF
(Chip On Flex/Film) technique, the GOA technique could greatly save
the manufacturing cost, save the bonging process of the COF on the
Gate side, and increase the producing performance. Therefore, GOA
is an important technique in the future development of the liquid
crystal panel.
[0004] Along with the development of the low temperature
polysilicon (LTPS) semiconductor transistors and due to the very
high carrier mobility of the LTPS semiconductors, corresponded
integrated peripheral circuits of the panel and researches relating
to the system on panel (SOP) techniques are focused by people and
are become reality step by step.
[0005] At present, due to the well-development of integrated
In-Cell Touch panel technology, it is widely used in high-end
mobile phones. In the integrated touch panels, since the display
refreshing time is separated, the panels usually perform touch
scanning within a keeping time (i.e., touch panel suspending time),
so that the working status of the GOA circuit of the panel is no
longer continuous. Therefore, a certain number of stages are
scanned continuously, the scan status is kept for a period of time
after the scan, and then another scan starts to continue to scan
the rest stages. However, when the GOA circuit is in the keeping
status, the problem of insufficient circuit maintenance capability
happens easily, so that the cascaded transmission of the GOA
circuit might fail and the display abnormality occurs.
[0006] Therefore, there is an urgent need for an improved GOA
circuit to overcome the problem of insufficient circuit maintenance
capability so that failure of cascaded transmission of the GOA
circuit could be reduced and the circuit could be more stable.
SUMMARY
[0007] The technique issue to be solved by the embodiments of the
present invention is to provide a GOA circuit, liquid crystal panel
and display device to overcome the problem of insufficient circuit
maintenance capability so that failure of cascaded transmission of
the GOA circuit could be reduced and the circuit could be more
stable.
[0008] In order to solve the technique issue mentioned above, one
embodiment of the present invention provides a GOA circuit. The GOA
circuit comprises a plurality of GOA structural units connected in
cascade, wherein each one stage of the GOA structural units outputs
a line scanning signal to a corresponding one line of pixel units
within a display area of a display panel in accordance with what is
done by a Nth stage GOA structural unit of the GOA structural
units; wherein, the Nth stage GOA structural unit comprises a
forward-reverse scan control module for controlling the GOA circuit
to scan forwardly or inversely by using a forward direct-current
scan control signal and a reverse direct-current scan control
signal; a node signal control input module for outputting a
low-level potential in a non-working stage of the GOA circuit; an
output control module for controlling output of a gate driving
signal; a voltage-stabilizing module for maintaining a potential of
a first node; a node Q pull-down module for pulling down the
potential of the first node; a node P pull-down module for pulling
down a potential of a second node; a gate signal pull-down module
for pulling down a potential of a current-stage gate driving signal
and controlling output of the current-stage gate driving signal
during a scan period of a touch panel; a GAS signal function module
for turning on all gate driving signals of the GOA circuit and
controlling output of the current-stage gate driving signal during
the scan period of the touch panel by using a first GAS signal and
a second GAS signal; and a self-lifting capacitor for a second
lifting of the potential of the first node, and N is a positive
integer; wherein,
[0009] the voltage-stabilizing module comprises a first thin film
transistor (TFT), wherein a gate of the first TFT receives a third
GAS signal, a source of the first TFT is connected to both the
forward-reverse scan control module and the node Q pull-down
module, and a drain of the first TFT is connected to the first
node; wherein the third GAS signal is a signal with a constant
high-level potential during the scan period of the touch panel, and
is a signal with a constant low-level potential in a suspending
period of the touch panel.
[0010] Wherein, the forward-reverse scan control module comprises a
second TFT and a third TFT; wherein,
[0011] a gate of the second TFT receives a current-stage gate
driving signal of a (N-2)th stage GOA structural unit of the GOA
structural units, a source of the second TFT receives the forward
direct-current scan control signal, and a drain of the second TFT
is connected to both the source of the first TFT of the
voltage-stabilizing module and a drain of the third TFT;
[0012] a gate of the third TFT receives a current-stage gate
driving signal of a (N+2)th stage GOA structural unit of the GOA
structural units, and a source of the third TFT receives the
reverse direct-current scan control signal.
[0013] Wherein, the node signal control input module comprises a
fourth TFT, a fifth TFT and a sixth TFT; wherein,
[0014] a gate of the fourth TFT receives the forward direct-current
scan control signal, a source of the fourth TFT receives a
current-stage clock signal of a (N+1)th stage GOA structural unit
of the GOA structural units, and a drain of the fourth TFT is
connected to a drain of the fifth TFT and a gate of the sixth
TFT;
[0015] a gate of the fifth TFT receives the reverse direct-current
scan control signal, and a source of the fifth TFT receives a
current-stage clock signal of a (N-1)th stage GOA structural unit
of the GOA structural units;
[0016] a source of the sixth TFT receives the signal with the
constant high-level potential, and a drain of the sixth TFT is
connected to the second node connected to the node Q pull-down
module, the node P pull-down module, the gate signal pull-down
module and the GAS signal function module.
[0017] Wherein, the output control module comprises a seventh TFT,
and a gate of the seventh TFT is connected to the first node, a
source of the seventh TFT receives a current-stage clock signal of
the Nth stage GOA structural unit, and a drain of the seventh TFT
receives the current-stage gate driving signal of the Nth stage GOA
structural unit.
[0018] Wherein, the node Q pull-down module comprises an eighth
TFT, and a gate of the eighth TFT is connected to the second node,
a source of the eighth TFT receives the signal with the constant
low-level potential, and a drain of the eighth TFT is connected to
the source of the first TFT of the voltage-stabilizing module and
is connected to the first node through the first TFT.
[0019] Wherein, the node P pull-down module comprises a ninth TFT,
and a gate of the ninth TFT is connected to both the drains of the
second TFT and the third TFT of the forward-reverse scan control
module, a source of the ninth TFT receives the signal with the
constant low-level potential, and a drain of the ninth TFT is
connected to the second node.
[0020] Wherein, the gate signal pull-down module comprises a tenth
TFT, and a gate of the tenth TFT is connected to the second node, a
source of the tenth TFT receives the signal with the constant
low-level potential, and a drain of the tenth TFT receives the
current-stage gate driving signal of the Nth stage GOA structural
unit.
[0021] Wherein, the GAS signal function module comprises an
eleventh TFT, a twelfth TFT and a thirteenth TFT; wherein,
[0022] a gate of the eleventh TFT receives the first GAS signal, a
source of the eleventh TFT receives the signal with the constant
low-level potential, and a drain of the eleventh TFT is connected
to the second node;
[0023] a gate of the twelfth TFT receives the first GAS signal and
is short-connected to a source of the twelfth TFT, and a drain of
the twelfth TFT receives the current-stage gate driving signal of
the Nth stage GOA structural unit;
[0024] a gate of the thirteenth TFT receives the second GAS signal,
a source of the thirteenth TFT receives the signal with the
constant low-level potential, and a drain of the thirteenth TFT
receives the current-stage gate driving signal of the Nth stage GOA
structural unit.
[0025] Correspondingly, one embodiment of the present invention
further provides a liquid crystal panel. The liquid crystal panel
comprises a GOA circuit. The GOA circuit comprises a plurality of
GOA structural units connected in cascade, wherein each one stage
of the GOA structural units outputs a line scanning signal to a
corresponding one line of pixel units within a display area of a
display panel in accordance with what is done by a Nth stage GOA
structural unit of the GOA structural units; wherein, the Nth stage
GOA structural unit comprises a forward-reverse scan control module
for controlling the GOA circuit to scan forwardly or inversely by
using a forward direct-current scan control signal and a reverse
direct-current scan control signal; a node signal control input
module for outputting a low-level potential in a non-working stage
of the GOA circuit; an output control module for controlling output
of a gate driving signal; a voltage-stabilizing module for
maintaining a potential of a first node; a node Q pull-down module
for pulling down the potential of the first node; a node P
pull-down module for pulling down a potential of a second node; a
gate signal pull-down module for pulling down a potential of a
current-stage gate driving signal and controlling output of the
current-stage gate driving signal during a scan period of a touch
panel; a GAS signal function module for turning on all gate driving
signals of the GOA circuit and controlling output of the
current-stage gate driving signal during the scan period of the
touch panel by using a first GAS signal and a second GAS signal;
and a self-lifting capacitor for a second lifting of the potential
of the first node, and N is a positive integer; wherein,
[0026] the voltage-stabilizing module comprises a first TFT,
wherein a gate of the first TFT receives a third GAS signal, a
source of the first TFT is connected to both the forward-reverse
scan control module and the node Q pull-down module, and a drain of
the first TFT is connected to the first node; wherein the third GAS
signal is a signal with a constant high-level potential during the
scan period of the touch panel, and is a signal with a constant
low-level potential in a suspending period of the touch panel.
[0027] Wherein, the forward-reverse scan control module comprises a
second TFT and a third TFT; wherein,
[0028] a gate of the second TFT receives a current-stage gate
driving signal of a (N-2)th stage GOA structural unit of the GOA
structural units, a source of the second TFT receives the forward
direct-current scan control signal, and a drain of the second TFT
is connected to both the source of the first TFT of the
voltage-stabilizing module and a drain of the third TFT;
[0029] a gate of the third TFT receives a current-stage gate
driving signal of a (N+2)th stage GOA structural unit of the GOA
structural units, and a source of the third TFT receives the
reverse direct-current scan control signal.
[0030] Wherein, the node signal control input module comprises a
fourth TFT, a fifth TFT and a sixth TFT; wherein,
[0031] a gate of the fourth TFT receives the forward direct-current
scan control signal, a source of the fourth TFT receives a
current-stage clock signal of a (N+1)th stage GOA structural unit
of the GOA structural units, and a drain of the fourth TFT is
connected to a drain of the fifth TFT and a gate of the sixth
TFT;
[0032] a gate of the fifth TFT receives the reverse direct-current
scan control signal, and a source of the fifth TFT receives a
current-stage clock signal of a (N-1)th stage GOA structural unit
of the GOA structural units;
[0033] a source of the sixth TFT receives the signal with the
constant high-level potential, and a drain of the sixth TFT is
connected to the second node connected to the node Q pull-down
module, the node P pull-down module, the gate signal pull-down
module and the GAS signal function module.
[0034] Wherein, the output control module comprises a seventh TFT,
and a gate of the seventh TFT is connected to the first node, a
source of the seventh TFT receives a current-stage clock signal of
the Nth stage GOA structural unit, and a drain of the seventh TFT
receives the current-stage gate driving signal of the Nth stage GOA
structural unit.
[0035] Wherein, the node Q pull-down module comprises an eighth
TFT, and a gate of the eighth TFT is connected to the second node,
a source of the eighth TFT receives the signal with the constant
low-level potential, and a drain of the eighth TFT is connected to
the source of the first TFT of the voltage-stabilizing module and
is connected to the first node through the first TFT.
[0036] Wherein, the node P pull-down module comprises a ninth TFT,
and a gate of the ninth TFT is connected to both the drains of the
second TFT and the third TFT of the forward-reverse scan control
module, a source of the ninth TFT receives the signal with the
constant low-level potential, and a drain of the ninth TFT is
connected to the second node.
[0037] Wherein, the gate signal pull-down module comprises a tenth
TFT, and a gate of the tenth TFT is connected to the second node, a
source of the tenth TFT receives the signal with the constant
low-level potential, and a drain of the tenth TFT receives the
current-stage gate driving signal of the Nth stage GOA structural
unit.
[0038] Wherein, the GAS signal function module comprises an
eleventh TFT, a twelfth TFT and a thirteenth TFT; wherein,
[0039] a gate of the eleventh TFT receives the first GAS signal, a
source of the eleventh TFT receives the signal with the constant
low-level potential, and a drain of the eleventh TFT is connected
to the second node;
[0040] a gate of the twelfth TFT receives the first GAS signal and
is short-connected to a source of the twelfth TFT, and a drain of
the twelfth TFT receives the current-stage gate driving signal of
the Nth stage GOA structural unit;
[0041] a gate of the thirteenth TFT receives the second GAS signal,
a source of the thirteenth TFT receives the signal with the
constant low-level potential, and a drain of the thirteenth TFT
receives the current-stage gate driving signal of the Nth stage GOA
structural unit.
[0042] Correspondingly, one embodiment of the present invention
further provides a display device. The display device comprises a
liquid crystal panel. The liquid crystal display panel comprises a
GOA circuit, wherein,
[0043] the GOA circuit comprises a plurality of GOA structural
units connected in cascade, wherein each one stage of the GOA
structural units outputs a line scanning signal to a corresponding
one line of pixel units within a display area of a display panel in
accordance with what is done by a Nth stage GOA structural unit of
the GOA structural units; wherein, the Nth stage GOA structural
unit comprises a forward-reverse scan control module for
controlling the GOA circuit to scan forwardly or inversely by using
a forward direct-current scan control signal and a reverse
direct-current scan control signal; a node signal control input
module for outputting a low-level potential in a non-working stage
of the GOA circuit; an output control module for controlling output
of a gate driving signal; a voltage-stabilizing module for
maintaining a potential of a first node; a node Q pull-down module
for pulling down the potential of the first node; a node P
pull-down module for pulling down a potential of a second node; a
gate signal pull-down module for pulling down a potential of a
current-stage gate driving signal and controlling output of the
current-stage gate driving signal during a scan period of a touch
panel; a GAS signal function module for turning on all gate driving
signals of the GOA circuit and controlling output of the
current-stage gate driving signal during the scan period of the
touch panel by using a first GAS signal and a second GAS signal;
and a self-lifting capacitor for a second lifting of the potential
of the first node, and N is a positive integer; wherein,
[0044] the voltage-stabilizing module comprises a first TFT,
wherein a gate of the first TFT receives a third GAS signal, a
source of the first TFT is connected to both the forward-reverse
scan control module and the node Q pull-down module, and a drain of
the first TFT is connected to the first node; wherein the third GAS
signal is a signal with a constant high-level potential during the
scan period of the touch panel, and is a signal with a constant
low-level potential in a suspending period of the touch panel.
[0045] Wherein, the forward-reverse scan control module comprises a
second TFT and a third TFT; wherein,
[0046] a gate of the second TFT receives a current-stage gate
driving signal of a (N-2)th stage GOA structural unit of the GOA
structural units, a source of the second TFT receives the forward
direct-current scan control signal, and a drain of the second TFT
is connected to both the source of the first TFT of the
voltage-stabilizing module and a drain of the third TFT;
[0047] a gate of the third TFT receives a current-stage gate
driving signal of a (N+2)th stage GOA structural unit of the GOA
structural units, and a source of the third TFT receives the
reverse direct-current scan control signal.
[0048] Wherein, the node signal control input module comprises a
fourth TFT, a fifth TFT and a sixth TFT; wherein,
[0049] a gate of the fourth TFT receives the forward direct-current
scan control signal, a source of the fourth TFT receives a
current-stage clock signal of a (N+1)th stage GOA structural unit
of the GOA structural units, and a drain of the fourth TFT is
connected to a drain of the fifth TFT and a gate of the sixth
TFT;
[0050] a gate of the fifth TFT receives the reverse direct-current
scan control signal, and a source of the fifth TFT receives a
current-stage clock signal of a (N-1)th stage GOA structural unit
of the GOA structural units;
[0051] a source of the sixth TFT receives the signal with the
constant high-level potential, and a drain of the sixth TFT is
connected to the second node connected to the node Q pull-down
module, the node P pull-down module, the gate signal pull-down
module and the GAS signal function module.
[0052] Wherein, the output control module comprises a seventh TFT,
and a gate of the seventh TFT is connected to the first node, a
source of the seventh TFT receives a current-stage clock signal of
the Nth stage GOA structural unit, and a drain of the seventh TFT
receives the current-stage gate driving signal of the Nth stage GOA
structural unit.
[0053] In the embodiments of the present invention, through setting
the signal, which is received by the gate of the first TFT of the
voltage-stabilizing module of each stage of the GOA structural
units in the GOA circuit, to be the third GAS signal which is at
the constant high-level potential VGH during the scan period of the
touch panel and at the constant low-level potential VGL during the
suspending period of the touch panel, the voltage-stabilizing
module is prevented from being turned on during the suspending
period of the touch panel and current leakage from the first node Q
to the constant low-level potential VGL through the node Q
pull-down module or from the first node Q to the low-level
potential of the corresponded direct-current scan control signal
through the forward-reverse scan control module could be stopped,
so that normally turning on the output control module and fully
turning on the next stage GOA structural unit after the suspending
period of the touch panel could be ensured. Therefore, the problem
of insufficient circuit maintenance capability could be overcome,
failure of cascaded transmission of the GOA circuit could be
reduced and the circuit could be more stable.
BRIEF DESCRIPTION OF THE DRAWINGS
[0054] In order to make the descriptions of the technique solutions
of the embodiments of the present invention or the existed
techniques, the drawings necessary for describing the embodiments
or the existed techniques are briefly introduced below. Obviously,
the drawings described below are only some embodiments of the
present invention, and, for those with ordinary skill in this
field, other drawings can be obtained from the drawings described
below without creative efforts.
[0055] FIG. 1 is a circuit diagram of one stage GOA structural unit
of the GOA circuit according to one embodiment of the present
invention.
[0056] FIG. 2 is a timing chart when one stage GOA structural unit
of the GOA circuit receives the signal with the constant high-level
potential VGH according to one embodiment of the present
invention.
[0057] FIG. 3 is a timing chart of one stage GOA structural unit of
the GOA circuit according to one embodiment of the present
invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
[0058] The embodiments of the present invention will be described
with reference to accompanying drawings as follows.
[0059] In the first embodiment of the present invention, a GOA
circuit is provided. The GOA circuit comprises a plurality of GOA
structural units connected in cascade, wherein each one stage of
the GOA structural units outputs a line scanning signal to a
corresponding one line of pixel units within a display area of a
display panel in accordance with what is done by a Nth stage GOA
structural unit of the GOA structural units. In order to simplify
the description, the Nth stage GOA structural unit is used as an
example for explanation, wherein N is a positive integer.
[0060] As shown in FIG. 1, the Nth stage GOA structural unit
comprises:
[0061] a forward-reverse scan control module 1 for controlling the
GOA circuit to scan forwardly or inversely by using a forward
direct-current scan control signal U2D and a reverse direct-current
scan control signal D2U;
[0062] a node signal control input module 2 for outputting a
low-level potential in a non-working stage of the GOA circuit;
[0063] an output control module 3 for controlling output of a gate
driving signal;
[0064] a voltage-stabilizing module 4 for maintaining a potential
of a first node Q(N);
[0065] a node Q pull-down module 5 for pulling down the potential
of the first node Q(N);
[0066] a node P pull-down module 6 for pulling down a potential of
a second node P(N);
[0067] a gate signal pull-down module 7 for pulling down a
potential of a current-stage gate driving signal G(N) and
controlling output of the current-stage gate driving signal G(N)
during a scan period of the touch panel;
[0068] a GAS signal function module 8 for turning on all gate
driving signals of the GOA circuit and controlling output of the
current-stage gate driving signal G(N) during the scan period of
the touch panel by using a first GAS signal GAS1 and a second GAS
signal GAS2; and
[0069] a self-lifting capacitor 9 for a second lifting of the
potential of the first node Q(N).
[0070] Wherein, the forward-reverse scan control module 1 comprises
a second thin film transistor (TFT) NT2 and a third TFT NT3. A gate
of the second TFT NT2 receives a current-stage gate driving signal
G(N-2) of a (N-2)th stage GOA structural unit of the GOA structural
units, a source of the second TFT NT2 receives the forward
direct-current scan control signal U2D, and a drain of the second
TFT NT2 is connected to both a source of a first TFT NT1 of the
voltage-stabilizing module 4 and a drain of the third TFT NT3. A
gate of the third TFT NT3 receives a current-stage gate driving
signal G(N+2) of a (N+2)th stage GOA structural unit of the GOA
structural units, and a source of the third TFT NT3 receives the
reverse direct-current scan control signal D2U.
[0071] Wherein, the node signal control input module 2 comprises a
fourth TFT NT4, a fifth TFT NT5 and a sixth TFT NT6. A gate of the
fourth TFT NT4 receives the forward direct-current scan control
signal U2D, a source of the fourth TFT NT4 receives a current-stage
clock signal CK(N+1) of a (N+1)th stage GOA structural unit of the
GOA structural units, and a drain of the fourth TFT NT4 is
connected to a drain of the fifth TFT NT5 and a gate of the sixth
TFT NT6. A gate of the fifth TFT NT5 receives the reverse
direct-current scan control signal D2U, and a source of the fifth
TFT NT5 receives a current-stage clock signal CK(N-1) of a (N-1)th
stage GOA structural unit of the GOA structural units. A source of
the sixth TFT NT6 receives the signal with the constant high-level
potential VGH, and a drain of the sixth TFT NT6 is connected to the
second node P(N) connected to the node Q pull-down module 5, the
node P pull-down module 6, the gate signal pull-down module 7 and
the GAS signal function module 8.
[0072] Wherein, the output control module 3 comprises a seventh TFT
NT7. A gate of the seventh TFT NT7 is connected to the first node
Q(N), a source of the seventh TFT NT7 receives a current-stage
clock signal CK(N) of the Nth stage GOA structural unit, and a
drain of the seventh TFT NT7 receives the current-stage gate
driving signal G(N) of the Nth stage GOA structural unit.
[0073] Wherein, the voltage-stabilizing module 4 comprises the
first TFT NT1. A gate of the first TFT NT1 receives a third GAS
signal GAS3, a source of the first TFT NT1 is connected to both the
forward-reverse scan control module 1 and the node Q pull-down
module 5, and a drain of the first TFT NT1 is connected to the
first node Q(N).
[0074] Wherein, the node Q pull-down module 5 comprises an eighth
TFT NT8. A gate of the eighth TFT NT8 is connected to the second
node P(N), a source of the eighth TFT NT8 receives the signal with
the constant low-level potential VGL, and a drain of the eighth TFT
NT8 is connected to the source of the first TFT NT1 of the
voltage-stabilizing module 4 and is connected to the first node
Q(N) through the first TFT NT1.
[0075] Wherein, the node P pull-down module 6 comprises a ninth TFT
NT9. A gate of the ninth TFT NT9 is connected to both the drains of
the second TFT NT2 and the third TFT NT3 of the forward-reverse
scan control module 1, a source of the ninth TFT NT9 receives the
signal with the constant low-level potential VGL, and a drain of
the ninth TFT NT9 is connected to the second node P(N).
[0076] Wherein, the gate signal pull-down module 7 comprises a
tenth TFT NT10. A gate of the tenth TFT NT10 is connected to the
second node P(N), a source of the tenth TFT NT10 receives the
signal with the constant low-level potential VGL, and a drain of
the tenth TFT NT10 receives the current-stage gate driving signal
G(N) of the Nth stage GOA structural unit.
[0077] Wherein, the GAS signal function module 8 comprises an
eleventh TFT NT11, a twelfth TFT NT12 and a thirteenth TFT NT13. A
gate of the eleventh TFT NT11 receives the first GAS signal GAS1, a
source of the eleventh TFT NT11 receives the signal with the
constant low-level potential VGL, and a drain of the eleventh TFT
NT11 is connected to the second node P(N). A gate of the twelfth
TFT NT12 receives the first GAS signal GAS1 and is short-connected
to a source of the twelfth TFT NT12, and a drain of the twelfth TFT
NT12 receives the current-stage gate driving signal G(N) of the Nth
stage GOA structural unit. A gate of the thirteenth TFT NT13
receives the second GAS signal GAS2, a source of the thirteenth TFT
NT13 receives the signal with the constant low-level potential VGL,
and a drain of the thirteenth TFT NT13 receives the current-stage
gate driving signal G(N) of the Nth stage GOA structural unit.
[0078] Wherein, the self-lifting capacitor 9 comprises a first
capacitor C1. One terminal of the first capacitor C1 receives the
signal with the constant low-level potential VGL, and another
terminal of the first capacitor C1 is connected to the source of
the first TFT NT1 of the voltage-stabilizing module 4 and connected
to the first node Q(N) through the first TFT NT1, so as to perform
second lifting of the potential of the first node Q(N).
[0079] It is found by the applicant that when the third GAS signal
GAS3 received by the gate of the first TFT NT1 of the
voltage-stabilizing module 4 is always kept being the signal with
the constant high-level voltage VGH, the gate of the first TFT NT1
of the voltage-stabilizing module 4 would be kept at high-level
potential and being turned on always once entering the suspending
period of the touch panel so that charges would leak from the first
node Q(N) to the constant low-level potential VGL through the
source of the first TFT NT1 and the seventh TFT NT7 of the node Q
pull-down module 5, or leak from the first node Q(N) to the forward
direct-current scan control signal U2D or reverse direct-current
scan control signal D2U at low-level potential through the source
of the first TFT NT1 and the forward-reverse scan control module 1.
Therefore, after the suspending period of the touch panel is
finished, the potential of the first node Q(N) is too low to fully
turn on the seventh TFT NT7 of the output control module 3 so that
abnormal occurs in the current stage GOA structural unit and a next
stage GOA structural unit next to the current stage GOA structural
unit cannot be fully turned on. Please refer to FIG. 2 for the
specific timing diagram. It is noted that, the potentials of the
forward direct-current scan control signal U2D and the reverse
direct-current scan control signal D2U are different at the same
time, and the current leakage path of the first node Q(N) is
determined in accordance with the scan direction of the
forward-reverse scan control module 1. For example, when the
forward-reverse scan control module 1 scans in forward direction,
the forward direct-current scan control signal U2D is at high-level
potential and the reverse direct-current scan control signal D2U is
at low-level potential so that the charges are leaked from the
first node Q(N) to the reverse direct-current scan control signal
D2U. Or, when the forward-reverse scan control module 1 scans in
reverse direction, the charges are leaked from the first node Q(N)
to the forward direct-current scan control signal U2D.
[0080] In order to overcome the problem of insufficient circuit
maintenance capability so as to reduce failure of cascaded
transmission of the GOA circuit and increase stability of the
circuit, the present invention adjusts the third GAS signal GAS3
received by the gate of the first TFT NT1 of the
voltage-stabilizing module 4 so that the third GAS signal GAS3 is
kept being the signal with the constant high-level potential VGH
during the scan period of the touch panel and being the signal with
the constant low-level potential VGL during the suspending period
of the touch panel. Therefore, the first TFT NT1 of the
voltage-stabilizing module 4 could be terminated during the
suspending period of the touch panel, and charge leakage from the
first node Q(N) could be prevented. Please refer to FIG. 3 for the
specific timing diagram.
[0081] In the first embodiment of the present invention, the TFT's
used in the GOA structural units are N-type TFT's, the signal with
the constant high-level potential VGH is set at 10V, and the signal
with the constant low-level potential VGL is set at -7V. The
potential of the forward direct-current scan control signal U2D is
10V when the forward direct-current scan control signal U2D is with
high-level potential, and the potential of the forward
direct-current scan control signal U2D is -7V when the forward
direct-current scan control signal U2D is with low-level potential.
Similarly, the potential of the reverse direct-current scan control
signal D2U is -7V when the reverse direct-current scan control
signal D2U is with low-level potential, and the potential of the
reverse direct-current scan control signal D2U is 10V when the
reverse direct-current scan control signal D2U is with high-level
potential.
[0082] Corresponding to the GOA circuit provided by the first
embodiment of the present invention, the second embodiment of the
present invention provides a liquid crystal panel comprising the
GOA circuit having structure and connecting relationship the same
as the GOA circuit provided by the first embodiment of the present
invention. The details could be referred to the related contents of
the first embodiment of the present invention and are nod described
again here.
[0083] Corresponding to the liquid crystal panel provided in the
second embodiment of the present invention, the third embodiment of
the present invention provides a display device comprising the
liquid crystal panel having structure and connecting relationship
the same as the liquid crystal panel provided by the second
embodiment of the present invention. The details could be referred
to the related contents of the second embodiment of the present
invention and are nod described again here.
[0084] The beneficial effects obtained through adopting the
embodiments of the present invention are as follows:
[0085] In the embodiments of the present invention, through setting
the signal, which is received by the gate of the first TFT of the
voltage-stabilizing module of each stage of the GOA structural
units in the GOA circuit, to be the third GAS signal which is at
the constant high-level potential VGH during the scan period of the
touch panel and at the constant low-level potential VGL during the
suspending period of the touch panel, the voltage-stabilizing
module is prevented from being turned on during the suspending
period of the touch panel and current leakage from the first node Q
to the constant low-level potential VGL through the node Q
pull-down module or from the first node Q to the low-level
potential of the corresponded direct-current scan control signal
through the forward-reverse scan control module could be stopped,
so that normally turning on the output control module and fully
turning on the next stage GOA structural unit after the suspending
period of the touch panel could be ensured. Therefore, the problem
of insufficient circuit maintenance capability could be overcome,
failure of cascaded transmission of the GOA circuit could be
reduced and the circuit could be more stable.
[0086] The foregoing contents are detailed description of the
disclosure in conjunction with specific embodiments and the scope
of the present invention should not be limited accordingly. For the
person skilled in the art of the disclosure, without departing from
the concept of the disclosure, simple deductions or substitutions
can be made and should be included in the protection scope of the
application.
* * * * *