CN209947397U - Driving circuit of display panel and display device - Google Patents
Driving circuit of display panel and display device Download PDFInfo
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- CN209947397U CN209947397U CN201920868681.1U CN201920868681U CN209947397U CN 209947397 U CN209947397 U CN 209947397U CN 201920868681 U CN201920868681 U CN 201920868681U CN 209947397 U CN209947397 U CN 209947397U
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Abstract
The application discloses a drive circuit of a display panel and a display device. The driving circuit of the display panel comprises a voltage division detection circuit, a voltage comparison circuit, a reset signal generation circuit and a grid driving circuit; the detection end of the partial pressure detection circuit is connected with the output end of the system power supply, the output end of the partial pressure detection circuit is connected with the first input end of the voltage comparison circuit, a preset voltage signal is input into the second input end of the voltage comparison circuit, the output end of the voltage comparison circuit is connected with the input end of the reset signal generation circuit, the output end of the reset signal generation circuit is connected with the input end of the gate driving circuit, and a plurality of output ends of the gate driving circuit are connected with a plurality of gate lines arranged on the display panel in a one-to-one correspondence mode. According to the technical scheme, when the display device is shut down, residual charges in the pixels can be effectively released, and the reliability of the display device is improved.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a driving circuit of a display panel and a display device.
Background
After the display device enters the power-off state, because the pixels of the display panel have charges, the residual charges in the pixels can remain in the pixels until the next power-on, so that the display image of the display device can be displayed abnormally when the display device is powered on next time. To solve this problem, the power supply circuit in the display device outputs a reset signal to the gate driving circuit before the operating voltage drops to 0V, so that the gate driving circuit drives all the gate lines in the display panel according to the reset signal, thereby releasing the residual charges in the pixels.
The display device comprises a power supply circuit, a gate drive circuit and a display panel, wherein the power supply circuit receives an operating voltage signal provided by a system power supply, generates an opening voltage and a closing voltage according to the operating voltage signal, and outputs the opening voltage and the closing voltage to the gate drive circuit, so that the gate drive circuit can generate a pulse signal according to the opening voltage and the closing voltage, the pulse signal acts on a gate line, an active switch in the display panel can be completely opened, and residual charges in pixels are released.
However, when the display device is turned off, the operating voltage signal and the turn-on voltage outputted by the system power supply both decrease, and if the operating voltage signal decreases too low, the gate driving circuit cannot normally output the pulse signal to the gate line according to the reset signal, so that the residual charges in the pixels cannot be released, and the display device is abnormal in display.
SUMMERY OF THE UTILITY MODEL
The application provides a drive circuit of a display panel and a display device, aiming at solving the problem that residual charges in pixels of the display panel cannot be normally released due to too low reduction of operating voltage.
In order to achieve the above object, the present application provides a driving circuit of a display panel, the display panel is provided with a gate line and an active switch, the driving circuit of the display panel includes:
the detection end of the partial voltage detection circuit is connected with the output end of a system power supply, and the partial voltage detection circuit is configured to receive an operation voltage signal output by the system power supply and output the operation voltage signal after partial voltage;
a voltage comparison circuit, a first input end of which is connected with an output end of the voltage division detection circuit, a second input end of which inputs a preset voltage signal, and the voltage comparison circuit is configured to generate and output a low-level control signal when a value of the voltage signal input by the first input end is smaller than a value of the preset voltage signal input by the second input end;
a reset signal generating circuit, an input terminal of which is connected to an output terminal of the voltage comparing circuit, the reset signal generating circuit configured to generate and output a reset signal according to the low-level control signal; and
the input end of the grid driving circuit is connected with the output end of the reset signal generating circuit, and a plurality of output ends of the grid driving circuit are correspondingly connected with a plurality of grid lines arranged on the display panel one by one; the gate driving circuit is configured to receive the reset signal, generate a pulse signal according to the reset signal, and output the pulse signal to a gate line on the display panel to drive an active switch on the gate line to be turned on.
Optionally, the voltage division detection circuit includes a first resistor and a second resistor, a first end of the first resistor is a detection end of the voltage division detection circuit, a second end of the first resistor is an output end of the voltage division detection circuit, and is connected to a first end of the second resistor, and a second end of the second resistor is grounded.
Optionally, the resistance of the first resistor is 30 ohms, and the resistance of the second resistor is 10 ohms.
Optionally, the voltage comparison circuit includes a comparator, a non-inverting input terminal of the comparator is a first input terminal of the voltage comparison circuit, an inverting input terminal of the comparator is a second input terminal of the voltage comparison circuit, and an output terminal of the comparator is an output terminal of the voltage comparison circuit.
Optionally, the gate driving circuit includes a plurality of shift registers and a plurality of level shifters, the input ends of the plurality of shift registers are the input ends of the gate driving circuit, the output ends of the plurality of shift registers are connected to the input ends of the plurality of level shifters in a one-to-one correspondence, and the output ends of the plurality of level shifters are the output ends of the gate driving circuit.
Optionally, the driving circuit of the display panel further includes a core board, and the system power supply is disposed on the core board.
In order to achieve the above object, the present application further provides a driving circuit of a display panel, the display panel is provided with a gate line and an active switch, and the driving circuit of the display panel includes:
a voltage regulation circuit configured to provide a constant voltage signal;
the detection end of the partial voltage detection circuit is connected with the output end of a system power supply, and the partial voltage detection circuit is configured to receive an operation voltage signal output by the system power supply and output the operation voltage signal after partial voltage;
a voltage comparison circuit, a first input end of which is connected with an output end of the voltage division detection circuit, a second input end of which is connected with an output end of the voltage stabilizing circuit, the voltage comparison circuit being configured to generate and output a low-level control signal when a value of a voltage signal input by the first input end is smaller than a value of a constant voltage signal input by the second input end;
a reset signal generating circuit, an input terminal of which is connected to an output terminal of the voltage comparing circuit, the reset signal generating circuit configured to generate and output a reset signal according to the low-level control signal; and
the input end of the grid driving circuit is connected with the output end of the reset signal generating circuit, and a plurality of output ends of the grid driving circuit are correspondingly connected with a plurality of grid lines arranged on the display panel one by one; the gate driving circuit is configured to receive the reset signal, generate a pulse signal according to the reset signal, and output the pulse signal to a gate line on the display panel to drive an active switch on the gate line to be turned on.
To achieve the above object, the present application also provides a display device including the driving circuit of the display panel as described in any one of the above.
Optionally, the display device further includes a display panel.
Optionally, the display panel is provided with a gate line and an active switch, and a gate driving circuit of a driving circuit of the display panel is connected to the active switch through the gate line.
According to the technical scheme, the operating voltage signal output by the system power supply is divided by the voltage division detection circuit and then output to the voltage comparison circuit, when the display device enters a shutdown state, when the value of the voltage signal received by the first input end of the voltage comparison circuit is smaller than the value of the preset voltage signal input by the second input end of the voltage comparison circuit, the voltage comparison circuit outputs a low-level control signal to the reset signal generation circuit, the reset signal generation circuit generates a reset signal according to the received low-level control signal and outputs the reset signal to the gate drive circuit, so that the gate drive circuit can generate a pulse signal according to the received reset signal, the pulse signal acts on a gate line on the display panel, all active switches on the display panel can be turned on, and residual charges in pixels are released.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of a driving circuit of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a driving circuit of a display panel according to an embodiment of the present disclosure;
fig. 3 is a block diagram of an embodiment of the gate driving circuit in fig. 2.
The reference numbers illustrate:
| 10 | |
20 | Voltage |
| 30 | |
40 | Reset |
| 50 | |
60 | |
| 70 | Voltage stabilizing circuit | VCC | Operating voltage signal |
| R1 | A first resistor | D1 | Comparator with a comparator circuit |
| R2 | Second resistance | GND | Ground terminal |
| LDO | Voltage stabilizer | SR | Shift register |
| LS | Level shifter |
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
The application provides a driving circuit of a display panel.
Referring to fig. 1, the driving circuit of the display panel includes a divided voltage detecting circuit 20, a voltage comparing circuit 30, a reset signal generating circuit 40, and a gate driving circuit 50; the detection end of the voltage division detection circuit 20 is connected with the output end of the system power supply 10, the output end of the voltage division detection circuit 20 is connected with the first input end of the voltage comparison circuit 30, the second input end of the voltage comparison circuit 30 inputs a preset voltage signal, the output end of the voltage comparison circuit 30 is connected with the input end of the reset signal generation circuit 40, the output end of the reset signal generation circuit 40 is connected with the input end of the gate driving circuit 50, and the output ends of the gate driving circuit 50 are connected with a plurality of gate lines arranged on the display panel 60 in a one-to-one correspondence manner.
In this embodiment, the voltage division detection circuit 20 may be implemented by a sampling resistor voltage division detection circuit, which is not limited herein;
the voltage comparison circuit 30 may be implemented by a combination of a comparator, a hall sensor, and other circuits. Not limited herein;
the reset signal generating circuit 40 is configured to receive the low-level control signal output by the voltage comparing circuit 30, to generate and output a reset signal according to the low-level control signal;
the gate driving circuit 50, which may be a gate driver, is configured to receive the reset signal output by the reset signal generating circuit 40, so as to generate a pulse signal to act on the gate line on the display panel 60 according to the reset signal.
In the technical solution of this embodiment, when the display apparatus is turned off, the operating voltage signal VCC output by the system power supply 10 starts to decrease, for example, the operating voltage signal VCC output by the system power supply 10 starts to decrease from 12V. The voltage division detection circuit 20 detects an operating voltage signal VCC output by the system power supply 10, and divides the operating voltage signal VCC and outputs the divided operating voltage signal VCC to a first input terminal of the voltage comparison circuit 30, for example, when the operating voltage signal VCC is 12V, the operating voltage signal VCC is divided by the voltage division detection circuit 20, a voltage signal output to the first input terminal of the voltage comparison circuit 30 is 3V, a second input terminal of the voltage comparison circuit 30 receives a preset voltage signal, the preset voltage signal may be provided by an external circuit, such as a regulated power supply or a regulated power supply 70, and the preset voltage signal may be set to 2.5V. When the value of the voltage signal input by the first input terminal of the voltage comparison circuit 30 is smaller than the value of the preset voltage signal input by the second input terminal thereof, the voltage comparison circuit 30 generates a low-level control signal and outputs the low-level control signal to the reset signal generation circuit 40, and when receiving the low-level control signal output by the voltage comparison circuit 30, the reset signal generation circuit 40 generates a reset signal and outputs the reset signal to the gate driving circuit 50, so that the gate driving circuit 50 can generate a pulse signal according to the reset signal and apply the generated pulse signal to the gate lines on the display panel 60, thereby controlling all active switches on the display panel 60 to be turned on and releasing charges remaining in the pixels, wherein the active switches can be selected as thin film transistors. That is, according to the technical solution of the present application, the reset signal is not output when the operating voltage signal VCC output by the system power supply 10 drops to approximately 0V, but the reset signal is output when the value of the operating voltage signal VCC output by the system power supply 10 drops to a certain set voltage value, so that the gate driving circuit 50 can normally output the pulse signal, and it is ensured that all the residual charges in the pixels can be released, thereby improving the reliability of the display device.
In the technical scheme of the application, the operating voltage signal VCC output by the system power supply 10 is divided by the voltage division detection circuit 20 and then output to the voltage comparison circuit 30, when the display device enters a shutdown state, when the value of the voltage signal received by the first input terminal of the voltage comparison circuit 30 is smaller than the value of the preset voltage signal input by the second input terminal thereof, the voltage comparison circuit 30 outputs a low-level control signal to the reset signal generation circuit 40, the reset signal generation circuit 40 generates a reset signal according to the received low-level control signal and outputs the reset signal to the gate driving circuit 50, so that the gate driving circuit 50 can generate a pulse signal according to the received reset signal, and the pulse signal acts on the gate lines on the display panel 60, so that all the active switches on the display panel 60 can be turned on, and the residual charges in the pixels can be released.
In an embodiment, referring to fig. 2, the voltage division detecting circuit 20 includes a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is a detecting end of the voltage division detecting circuit 20, a second end of the first resistor R1 is an output end of the voltage division detecting circuit 20 and is connected to a first end of the second resistor R2, and a second end of the second resistor R2 is grounded.
That is, a first terminal of the first resistor R1 is connected to the output terminal of the system power supply 10, a second terminal of the first resistor R1 is connected to the first input terminal of the voltage comparator 30 and to a first terminal of the second resistor R2, and a second terminal of the second resistor R2 is grounded.
Specifically, the first resistor R1 and the second resistor R2 adopt series voltage division, and according to the principle of voltage division, the larger the ratio of the first resistor R1 to the second resistor R2 is, the larger the voltage divided across the first resistor R1 is. After the display device enters the shutdown state, the operating voltage signal VCC output by the system power supply 10 starts to decrease, the voltage signal divided by the operating voltage signal VCC through the first resistor R1 and the second resistor R2 also gradually decreases, and the divided voltage detection circuit 20 outputs the divided voltage signal to the voltage comparison circuit 30.
Optionally, the resistance of the first resistor R1 may be set to 30 ohms, the resistance of the second resistor R2 may be 10 ohms, and the resistances of the first resistor R1 and the second resistor R2 may also be set according to actual needs.
In one embodiment, referring to fig. 2, the voltage comparison circuit 30 includes a comparator D1, the non-inverting input terminal of the comparator D1 is the first input terminal of the voltage comparison circuit 30, the inverting input terminal of the comparator D1 is the second input terminal of the voltage comparison circuit 30, and the output terminal of the comparator D1 is the output terminal of the voltage comparison circuit 30.
That is, the non-inverting input terminal of the comparator D1 is connected to the output terminal of the voltage division detecting circuit 20, and the inverting input terminal of the comparator D1 receives a preset voltage signal, where the preset voltage signal can be provided by an external circuit, such as a regulated power supply or a voltage stabilizing circuit, and the present embodiment can obtain a corresponding preset voltage signal after stabilizing the voltage signal provided by the external circuit by the voltage stabilizer LDO.
Specifically, the non-inverting input terminal of the comparator D1 receives the divided voltage signal output by the voltage division detection circuit 20, and the inverting input terminal thereof receives the preset voltage signal provided by the external circuit. When the display device enters the power-off state, the operating voltage signal VCC provided by the system power supply 10 starts to decrease, the voltage signal transmitted to the non-inverting input terminal of the comparator D1 after being divided by the voltage division detection circuit 20 also starts to decrease, and when the voltage signal received by the non-inverting input terminal of the comparator D1 is greater than or equal to the preset voltage signal received by the inverting input terminal thereof, the comparator D1 outputs a high-level control signal to the reset signal generating circuit 40. When the voltage signal received by the non-inverting input terminal of the comparator D1 is less than the predetermined voltage signal received by the inverting input terminal thereof, the comparator D1 outputs a low-level control signal to the reset signal generating circuit 40.
In an embodiment, referring to fig. 3, the gate driving circuit 50 includes a plurality of shift registers SR and a plurality of level shifters LS, wherein input ends of the plurality of shift registers SR are input ends of the gate driving circuit 50, output ends of the plurality of shift registers SR are connected to input ends of the plurality of level shifters LS in a one-to-one correspondence, and output ends of the plurality of level shifters LS are output ends of the gate driving circuit 50.
The power input terminal of the gate driving circuit 50 is connected to the output terminal of the system power supply 10, the gate driving circuit 50 operates normally according to the operating voltage signal VCC provided by the system power supply 10, and when receiving the reset signal output by the reset signal generating circuit 40, the gate driving circuit 50 generates a plurality of pulse signals through the operation of the shift register SR and the level shifter LS therein, and outputs the plurality of pulse signals to the gate lines, thereby driving the active switches on the display panel 60 to be turned on.
The application also provides a display device, display device includes as above any display panel's drive circuit and display panel, be equipped with initiative switch and gate line on the display panel, display panel's drive circuit's gate drive circuit warp the gate line with initiative switch connects.
The detailed structure of the driving circuit of the display panel can refer to the above embodiments, and is not described herein again; it can be understood that, because the display device of the present application uses the driving circuit of the display panel, the embodiment of the display device of the present application includes all technical solutions of all embodiments of the driving circuit of the display panel, and the achieved technical effects are also completely the same, and are not described herein again.
In this embodiment, the display device may be a display device having a display panel, such as a television, a tablet computer, or a mobile phone. The display panel may be any one of: a liquid crystal display panel, an OLED display panel, a QLED display panel, a Twisted Nematic (TN) or Super Twisted Nematic (STN) type, an In-Plane Switching (IPS) type, a Vertical Alignment (VA) type, a curved panel, or other display panels.
The above description is only an alternative embodiment of the present application, and not intended to limit the scope of the present application, and all modifications and equivalents of the technical solutions that can be directly or indirectly applied to other related fields without departing from the spirit of the present application are intended to be included in the scope of the present application.
Claims (10)
1. The utility model provides a drive circuit of display panel, be equipped with gate line and active switch on the display panel, its characterized in that, display panel's drive circuit includes:
the detection end of the partial voltage detection circuit is connected with the output end of a system power supply, and the partial voltage detection circuit is configured to receive an operation voltage signal output by the system power supply and output the operation voltage signal after partial voltage;
a voltage comparison circuit, a first input end of which is connected with an output end of the voltage division detection circuit, a second input end of which inputs a preset voltage signal, and the voltage comparison circuit is configured to generate and output a low-level control signal when a value of the voltage signal input by the first input end is smaller than a value of the preset voltage signal input by the second input end;
a reset signal generating circuit, an input terminal of which is connected to an output terminal of the voltage comparing circuit, the reset signal generating circuit configured to generate and output a reset signal according to the low-level control signal; and
the input end of the grid driving circuit is connected with the output end of the reset signal generating circuit, and a plurality of output ends of the grid driving circuit are correspondingly connected with a plurality of grid lines arranged on the display panel one by one; the gate driving circuit is configured to receive the reset signal, generate a pulse signal according to the reset signal, and output the pulse signal to a gate line on the display panel to drive an active switch on the gate line to be turned on.
2. The driving circuit of claim 1, wherein the voltage division detection circuit comprises a first resistor and a second resistor, a first terminal of the first resistor is a detection terminal of the voltage division detection circuit, a second terminal of the first resistor is an output terminal of the voltage division detection circuit and is connected to a first terminal of the second resistor, and a second terminal of the second resistor is grounded.
3. The display panel driving circuit according to claim 2, wherein the first resistor has a resistance of 30 ohms and the second resistor has a resistance of 10 ohms.
4. The driving circuit of the display panel according to claim 1, wherein the voltage comparison circuit comprises a comparator, a non-inverting input terminal of the comparator is a first input terminal of the voltage comparison circuit, an inverting input terminal of the comparator is a second input terminal of the voltage comparison circuit, and an output terminal of the comparator is an output terminal of the voltage comparison circuit.
5. The driving circuit of a display panel according to any one of claims 1 to 4, wherein the gate driving circuit includes a plurality of shift registers and a plurality of level shifters, the input terminals of the plurality of shift registers are all the input terminals of the gate driving circuit, the output terminals of the plurality of shift registers are connected to the input terminals of the plurality of level shifters in a one-to-one correspondence, and the output terminals of the plurality of level shifters are the output terminals of the gate driving circuit.
6. The display panel driving circuit according to claim 1, wherein the display panel driving circuit further includes a core board, and the system power supply is provided on the core board.
7. The utility model provides a drive circuit of display panel, be equipped with gate line and active switch on the display panel, its characterized in that, display panel's drive circuit includes:
a voltage regulation circuit configured to provide a constant voltage signal;
the detection end of the partial voltage detection circuit is connected with the output end of a system power supply, and the partial voltage detection circuit is configured to receive an operation voltage signal output by the system power supply and output the operation voltage signal after partial voltage;
a voltage comparison circuit, a first input end of which is connected with an output end of the voltage division detection circuit, a second input end of which is connected with an output end of the voltage stabilizing circuit, the voltage comparison circuit being configured to generate and output a low-level control signal when a value of a voltage signal input by the first input end is smaller than a value of a constant voltage signal input by the second input end;
a reset signal generating circuit, an input terminal of which is connected to an output terminal of the voltage comparing circuit, the reset signal generating circuit configured to generate and output a reset signal according to the low-level control signal; and
the input end of the grid driving circuit is connected with the output end of the reset signal generating circuit, and a plurality of output ends of the grid driving circuit are correspondingly connected with a plurality of grid lines arranged on the display panel one by one; the gate driving circuit is configured to receive the reset signal, generate a pulse signal according to the reset signal, and output the pulse signal to a gate line on the display panel to drive an active switch on the gate line to be turned on.
8. A display device characterized by comprising the driving circuit of the display panel according to any one of claims 1 to 7.
9. The display device of claim 8, wherein the display device further comprises a display panel.
10. The display device as claimed in claim 9, wherein the display panel is provided with a gate line and an active switch, and a gate driving circuit of a driving circuit of the display panel is connected to the active switch through the gate line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920868681.1U CN209947397U (en) | 2019-06-06 | 2019-06-06 | Driving circuit of display panel and display device |
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| CN201920868681.1U CN209947397U (en) | 2019-06-06 | 2019-06-06 | Driving circuit of display panel and display device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112331120A (en) * | 2020-11-05 | 2021-02-05 | 北海惠科光电技术有限公司 | Array substrate row driving reset circuit and method and display device |
| CN113053275A (en) * | 2021-03-15 | 2021-06-29 | 京东方科技集团股份有限公司 | Display panel, detection method and compensation method thereof and display device |
| WO2023168762A1 (en) * | 2022-03-11 | 2023-09-14 | 深圳市华星光电半导体显示技术有限公司 | Display driving circuit, display driving device, and display driving method |
-
2019
- 2019-06-06 CN CN201920868681.1U patent/CN209947397U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112331120A (en) * | 2020-11-05 | 2021-02-05 | 北海惠科光电技术有限公司 | Array substrate row driving reset circuit and method and display device |
| CN113053275A (en) * | 2021-03-15 | 2021-06-29 | 京东方科技集团股份有限公司 | Display panel, detection method and compensation method thereof and display device |
| CN113053275B (en) * | 2021-03-15 | 2022-10-28 | 京东方科技集团股份有限公司 | Display panel, detection method and compensation method thereof and display device |
| WO2023168762A1 (en) * | 2022-03-11 | 2023-09-14 | 深圳市华星光电半导体显示技术有限公司 | Display driving circuit, display driving device, and display driving method |
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