CN111028806B - Gate drive circuit, liquid crystal panel, display device and aging method - Google Patents

Gate drive circuit, liquid crystal panel, display device and aging method Download PDF

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Publication number
CN111028806B
CN111028806B CN201911339681.3A CN201911339681A CN111028806B CN 111028806 B CN111028806 B CN 111028806B CN 201911339681 A CN201911339681 A CN 201911339681A CN 111028806 B CN111028806 B CN 111028806B
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circuit
resistor
voltage
resistance value
display device
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CN111028806A (en
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李文东
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Chengdu CEC Panda Display Technology Co Ltd
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Chengdu CEC Panda Display Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays

Abstract

The application provides a gate driving circuit, a liquid crystal panel, a display device and an aging method. The circuit includes: the first pin of the gate drive circuit is configured to receive an input voltage. The second pin of the gate driving circuit is configured to adjust the resistance value of the target resistor to be greater than a preset resistance value when receiving an instruction indicating that the display device starts to be aged, and adjust the resistance value of the target resistor to be equal to the preset resistance value after a preset time period. The third pin of the gate driving circuit is configured to output an output voltage corresponding to the target resistance through the input voltage based on the reference voltage whose amplitude is kept constant. When the resistance value of the target resistor is larger than the preset resistance value, the amplitude of the output voltage is larger than the amplitude of the starting voltage of a Thin Film Transistor (TFT) in the display device; when the resistance value of the target resistor is equal to the preset resistance value, the amplitude of the output voltage is equal to the amplitude of the turn-on voltage of the Thin Film Transistor (TFT) in the display device. Thereby, automatic burn-in of the display device is achieved.

Description

Gate drive circuit, liquid crystal panel, display device and aging method
Technical Field
The present disclosure relates to the field of liquid crystal display technologies, and in particular, to a gate driving circuit, a liquid crystal panel, a display device, and an aging method.
Background
Display devices, such as Thin Film Transistor-Liquid Crystal displays (TFT-LCDs), have the characteristics of light weight, flatness, low power consumption, no radiation, excellent Display quality, and the like, and are widely used in various occasions, such as homes, offices, vehicles, and the like. After the display device is created, the display device may be aged (aging) based on conditions more severe than normal display conditions in order to ensure the quality of the display device.
In a common aging method, a display device can be specially externally connected with a circuit board, the circuit board can provide a voltage 1 to a Thin Film Transistor (TFT) in the display device by setting a software code when the display device starts to age, and the amplitude of the voltage 1 is higher than the starting voltage (V) of the TFTGH) The amplitude of (c). Then, the circuit board is disconnected from the thin film transistor TFT, and a voltage 2 having a magnitude equal to that of the thin film transistor TFT is output from a gate driving circuit on a TCON board in the display deviceTurn-on voltage (V)GH) And then the whole aging process of the display device is completed by determining the display condition of the display device under the voltage 2.
However, the above aging method requires alternately switching the connection between the external circuit board and the TCON board and the TFT, which is inconvenient and troublesome, and cannot achieve automatic aging of the display device.
Disclosure of Invention
The application provides a gate driving circuit, a liquid crystal panel, a display device and an aging method, which aim to solve the problem that in the prior art, an external circuit board and a TCON board need to be alternately switched to be respectively connected with a Thin Film Transistor (TFT) and the automatic aging of the display device is not realized.
In a first aspect, the present application provides a gate driving circuit for burn-in, comprising:
a first pin of the gate drive circuit configured to receive an input voltage;
the second pin of the gate driving circuit is configured to adjust the resistance value of the target resistor to be larger than a preset resistance value when receiving an instruction indicating that the display device starts to be aged; after a preset time length, adjusting the resistance value of the target resistor to be equal to the preset resistance value;
a third pin of the gate driving circuit, configured to output an output voltage corresponding to a target resistance through the input voltage based on a reference voltage whose amplitude remains unchanged, the reference voltage being used for feeding back the amplitude of the output voltage;
when the resistance value of the target resistor is larger than the preset resistance value, the amplitude of the output voltage is larger than the amplitude of the starting voltage of a Thin Film Transistor (TFT) in the display device; and when the resistance value of the target resistor is equal to the preset resistance value, the amplitude of the output voltage is equal to the amplitude of the starting voltage of a Thin Film Transistor (TFT) in the display device.
Optionally, the gate driving circuit includes: the circuit comprises a switching circuit, a control circuit and a booster circuit;
the input end of the boost circuit is used for receiving input voltage, the first end of the switching circuit is connected with the output end of the boost circuit, the target resistor is arranged in the boost circuit and is connected with the output end of the boost circuit, the second end of the switching circuit is connected with the first end of the control circuit, the third end of the switching circuit is used for receiving instructions, and the second end of the control circuit is connected with the control end of the boost circuit;
the switching circuit is used for adjusting the resistance value of the target resistor to be larger than the preset resistance value when receiving an instruction for indicating that the display device is aged, and adjusting the resistance value of the target resistor to be equal to the preset resistance value after the preset time;
the switching circuit is further used for outputting the reference voltage with the constant amplitude to the control circuit from the moment of receiving an instruction for starting aging of the display device;
the control circuit is used for sending a switching signal to the boosting circuit based on the reference voltage;
and the booster circuit is used for storing energy through the input voltage according to the switching signal and outputting the output voltage corresponding to the target resistor.
Optionally, the switching circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a first transistor and a first circuit;
a first end of the first resistor is connected to an output end of the boost circuit, a second end of the first resistor is connected to a first end of the control circuit, a first end of the second resistor and a first end of the third resistor, respectively, and is configured to output the reference voltage to the control circuit, a second end of the third resistor is connected to a drain of the first transistor, an input end of the first circuit is configured to receive an instruction, an output end of the first circuit is connected to a gate of the first transistor, and a source of the first transistor and a second end of the second resistor are both grounded;
the first circuit is used for turning on the first transistor when receiving an instruction for starting aging of the display device; and after the preset time, cutting off the first transistor.
Optionally, the first transistor is an NMOS transistor or an NPN transistor.
Optionally, the boost circuit comprises: the circuit comprises an inductor, a second transistor, a diode, a first capacitor, a fourth resistor and a fifth resistor;
the first end of the inductor is used for receiving the input voltage, the second end of the inductor is connected with the drain of the second transistor and the anode of the diode respectively, the source of the second transistor is connected with the first end of the fourth resistor, the gate of the second transistor is connected with the second end of the control circuit and used for receiving the switching signal, the switching signal is used for switching on or switching off the second transistor, the cathode of the diode is connected with the first end of the first capacitor and the first end of the fifth resistor respectively, the second end of the fifth resistor is the output end of the boost circuit and used for outputting the output voltage to the display device, and the second end of the fourth resistor and the second end of the first capacitor are both grounded.
Optionally, the boost circuit further comprises: the second capacitor, the third capacitor, the fourth capacitor and the sixth resistor;
the first end of the second capacitor is connected with the first end of the inductor, the first end of the sixth resistor is connected with the second end of the inductor, the second end of the sixth resistor is connected with the first end of the third capacitor, the first end of the fourth capacitor is connected between the first end of the first capacitor and the first end of the fifth resistor, and the second end of the second capacitor, the second end of the third capacitor and the second end of the fourth capacitor are all grounded.
Optionally, the control circuit comprises: a seventh resistor, an eighth resistor and a second circuit;
the first end of the second circuit is connected to the second end of the switching circuit, and is configured to receive the reference voltage, the second end of the second circuit is connected to the first end of the seventh resistor, the second end of the seventh resistor is respectively connected to the first end of the eighth resistor and the control end of the voltage boost circuit, and is configured to send the switching signal to the voltage boost circuit, and the second end of the eighth resistor is grounded.
Optionally, the third terminal of the second circuit is connected to the source of the second transistor;
the second circuit is further configured to obtain an amplitude of a voltage corresponding to the fourth resistor; and determining whether the boost circuit is short-circuited according to the amplitude of the voltage.
Optionally, the magnitude of the turn-on voltage is 25V.
In a second aspect, the present application provides a liquid crystal panel comprising: a thin film transistor TFT and a gate driving circuit as in the first aspect and possible embodiments of the first aspect;
the gate driving circuit is connected with the gate of the thin film transistor TFT through a gate line and is used for controlling the thin film transistor TFT to be in an open state or a closed state.
In a third aspect, the present application provides a display device comprising: a housing, a backlight module and a liquid crystal panel as possible embodiments of the second aspect and the second aspect;
the backlight module and the liquid crystal panel are arranged in the shell, the backlight module is used for providing a light source for the liquid crystal panel, and the liquid crystal panel is used for displaying image pictures.
In a fourth aspect, the present application provides an aging method applied to the gate driving circuit as described in the first aspect and possible embodiments of the first aspect. The method comprises the following steps:
when an instruction indicating that the display device starts to be aged is received, adjusting the resistance value of the target resistor to be larger than a preset resistance value;
outputting an output voltage corresponding to the target resistance through an input voltage based on a reference voltage, wherein the amplitude of the output voltage is larger than that of a starting voltage of a Thin Film Transistor (TFT) in the display device; wherein the reference voltage is used for feeding back the amplitude of the output voltage;
after a preset time length, adjusting the resistance value of the target resistor to be equal to the preset resistance value;
and outputting an output voltage corresponding to the target resistance through the input voltage based on the reference voltage with the amplitude kept unchanged, wherein the amplitude of the output voltage is equal to the amplitude of the turn-on voltage of a Thin Film Transistor (TFT) in the display device.
Optionally, the method further comprises:
when an instruction indicating that the display device starts to display is received, adjusting the resistance value of the target resistor to be equal to the preset resistance value;
and outputting an output voltage corresponding to the target resistance through the input voltage based on the reference voltage.
The gate driving circuit, the liquid crystal panel, the display device and the aging method are provided, wherein the gate driving circuit is configured to receive an input voltage through a first pin of the gate driving circuit. And the second pin of the gate driving circuit is configured to adjust the resistance value of the target resistor to be greater than the preset resistance value when receiving an instruction indicating that the display device starts to be aged, and adjust the resistance value of the target resistor to be equal to the preset resistance value after a preset time period. A second pin of the gate drive circuit is configured to maintain a constant reference voltage based on the magnitude. And outputting the output voltage corresponding to the target resistance through the input voltage. When the resistance value of the target resistor is larger than the preset resistance value, the amplitude of the output voltage is larger than the amplitude of the starting voltage of the thin film transistor TFT; when the resistance value of the target resistor is equal to the preset resistance value, the amplitude of the output voltage is equal to the amplitude of the starting voltage of the thin film transistor TFT. In the application, based on the corresponding relation between the resistors and the voltage, when the display device starts to be aged by means of adjusting the resistance of the target resistor, the resistance of the target resistor is adjusted to be larger than the preset resistance, so that the grid electrode of the Thin Film Transistor (TFT) receives the voltage of which the amplitude is larger than the starting voltage of the Thin Film Transistor (TFT). After a period of time, the resistance value of the target resistor is adjusted to be equal to the preset resistance value, so that the grid electrode of the thin film transistor TFT receives a voltage with the amplitude value equal to the starting voltage of the thin film transistor TFT, and the aging process of the display device is completed. By doing so, not only need not to switch different circuit boards and realize display device's ageing, saved the cost of newly-increased circuit board, reduced display device's hardware cost, realized display device's ageing automatically, reduced the productivity loss that leads to because wrong switching operation, promoted display device's ageing efficiency, and except realizing display device's ageing automatically, can also satisfy display device's normal display demand.
Drawings
In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1a is a schematic structural diagram of a gate driving circuit according to an embodiment of the present disclosure;
fig. 1b is a schematic structural diagram of a gate driving circuit according to an embodiment of the present disclosure;
fig. 2 is a circuit connection diagram of a gate driving circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a liquid crystal panel according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a display device according to an embodiment of the present application;
fig. 5 is a schematic flowchart of an aging method according to an embodiment of the present application.
Detailed Description
To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application, and it is obvious that the described embodiments are some, but not all embodiments of the present application. 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.
In order to realize the aging of the display device, the application provides a gate drive circuit, a liquid crystal panel, a display device and an aging method, the resistance value of a target resistor can be adjusted based on the corresponding relation between the resistor and the voltage, and when the display device is aged, the resistance value of the target resistor can be adjusted to be larger than a preset resistance value, so that the gate of a Thin Film Transistor (TFT) receives an amplitude value larger than the starting voltage (V) of the TFTGH) The voltage of (c). After a period of time, the resistance value of the target resistor can be adjusted to be equal to the preset resistance value, so that the grid electrode of the Thin Film Transistor (TFT) receives the amplitude value equal to the starting voltage (V) of the Thin Film Transistor (TFT)GH) The aging process of the display device is automatically realized. By doing so, not only need not to switch different circuit boards and realize display device's ageing, saved the cost of newly-increased circuit board, reduced display device's hardware cost, realized display device's ageing automatically, reduced the productivity loss that leads to because wrong switching operation, promoted display device's ageing efficiency, and except realizing display device's ageing automatically, can also satisfy display device's normal display demand.
Next, the detailed structure of the gate driving circuit, the detailed structure of the liquid crystal panel, the detailed structure of the display device, and the implementation process of the aging method will be described in detail through specific embodiments.
Illustratively, the present application provides a gate driving circuit. Fig. 1a is a schematic structural diagram of a gate driving circuit according to an embodiment of the present disclosure. As shown in fig. 1a, the gate driving circuit 100 of the present application may have a first Pin1, a second Pin2, and a third Pin 3.
The first Pin1 of the gate driving circuit 100 is configured to receive an input voltage (V) from a display device or other devicesIN). Wherein the application is to the input voltage (V)IN) The specific size of (a) is not limited. For example, the input voltage (V)IN) Is 12V.
The second Pin2 of the gate driving circuit 100 is configured to receive an instruction from a display device or an operator. The instruction may indicate that the display device starts to be aged or normally displayed, and the specific interior of the instruction is not limited in the present application. And the instructions may take various forms of implementation, such as digital signals or analog signals.
The second Pin2 of the gate driving circuit 100 is further configured to adjust the resistance of the target resistor to be greater than the preset resistance when receiving an instruction indicating that the display device is to be aged, and to adjust the resistance of the target resistor to be equal to the preset resistance after a preset time period. In so doing, a correlation between the output voltage and the resistance value of the target resistor is established.
Wherein the predetermined resistance value is a turn-on voltage (V) of the TFTGH) The specific size of the preset resistance value is not limited by the corresponding resistance value. The turn-on voltage (V)GH) To turn on the voltage of the thin film transistor TFT, optionally, a turn-on voltage (V)GH) Is 25V. And the size of the preset duration is not limited by the application.
The third pin3 of the gate drive circuit 100 is configured to maintain a constant reference voltage (V) based on the amplitudeREF) By an input voltage (V)IN) Output voltage (V) corresponding to target resistanceOUT) Reference voltage (V)REF) For feeding back the output voltage (V)OUT) The amplitude of (c). Doing so, so that the output voltage (V)OUT) Will not be subjected to the reference voltage (V)REF) Is only associated with the resistance value of the target resistor to ensure the output voltage (V)OUT) Stability of (2).
Since the second Pin Pin2 of the gate driving circuit 100 can adjust the resistance of the target resistor, the third Pin Pin3 of the gate driving circuit 100 uses a reference voltage (V) with a constant amplitudeREF) As an output voltage (V)OUT) The reference of (1). Thus, the output voltage (V)OUT) Is associated with the resistance of the target resistor. Thus, when the resistance value of the target resistor is greater than the preset resistance value, the voltage (V) is outputOUT) Is greater than the turn-on voltage (V) of a Thin Film Transistor (TFT) in a display deviceGH) The amplitude of (c). When the resistance value of the target resistor is equal to the preset resistance value, outputting the voltage (V)OUT) Is equal to the turn-on voltage (V) of a Thin Film Transistor (TFT) in a display deviceGH) The amplitude of (c).
It should be noted that the Gate driving circuit 100 in the present application may be directly electrically connected to the Gate of the thin film transistor TFT through the Gate line, or may input an output voltage to a Gate Driver on Array (GOA) of the Array substrate, so that the GOA circuit may send a square wave signal to the Gate of the thin film transistor TFT200 through the Gate line, where the maximum amplitude of the square wave signal is the amplitude of the output voltage, so as to turn on or off the thin film transistor TFT 200.
The specific implementation form of the GOA circuit is not limited in the present application. The GOA circuit may be disposed in the gate driving circuit 100, or may be disposed independently, which is not limited in this application.
The gate driving circuit provided by the application is configured to receive an input voltage through a first pin of the gate driving circuit. And the second pin of the gate driving circuit is configured to adjust the resistance value of the target resistor to be greater than the preset resistance value when receiving an instruction indicating that the display device starts to be aged, and adjust the resistance value of the target resistor to be equal to the preset resistance value after a preset time period. A second pin of the gate drive circuit is configured to maintain a constant reference voltage based on the magnitude. And outputting the output voltage corresponding to the target resistance through the input voltage. When the resistance value of the target resistor is larger than the preset resistance value, the amplitude of the output voltage is larger than the amplitude of the starting voltage of the thin film transistor TFT; when the resistance value of the target resistor is equal to the preset resistance value, the amplitude of the output voltage is equal to the amplitude of the starting voltage of the thin film transistor TFT. In the application, based on the corresponding relation between the resistors and the voltage, when the display device starts to be aged by means of adjusting the resistance of the target resistor, the resistance of the target resistor is adjusted to be larger than the preset resistance, so that the grid electrode of the Thin Film Transistor (TFT) receives the voltage of which the amplitude is larger than the starting voltage of the Thin Film Transistor (TFT). After a period of time, the resistance value of the target resistor is adjusted to be equal to the preset resistance value, so that the grid electrode of the thin film transistor TFT receives a voltage with the amplitude value equal to the starting voltage of the thin film transistor TFT, and the aging process of the display device is completed. By doing so, not only need not to switch different circuit boards and realize display device's ageing, saved the cost of newly-increased circuit board, reduced display device's hardware cost, realized display device's ageing automatically, reduced the productivity loss that leads to because wrong switching operation, promoted display device's ageing efficiency, and except realizing display device's ageing automatically, can also satisfy display device's normal display demand.
On the basis of the embodiment shown in fig. 1a, as shown in fig. 1b, the gate driving circuit 100 of the present application may include: a switching circuit 1001, a control circuit 1002, and a booster circuit 1003.
IN this application, the input terminal IN of the voltage boost circuit 1003 is the first Pin1 of the gate driving circuit 100, the input terminal IN of the switching circuit 1001 is the second Pin2 of the gate driving circuit 100, and the output terminal OUT of the voltage boost circuit 1003 is the third Pin3 of the gate driving circuit 100. The switching circuit 1001 may receive an instruction from the display device at the start of aging of the display device, or receive an instruction in response to an operation by an operator. The specific content of the instruction can refer to the description content of the instruction in fig. 1a, and is not described herein again.
Based on the connection of the first terminal 1 of the switching circuit 1001 and the output terminal OUT of the voltage boost circuit 1003, and the target resistor is provided in the voltage boost circuit 1003, the target resistor is connected with the output terminal OUT of the voltage boost circuit 1003, so that the switching circuit 1001 can adjust the resistance value of the target resistor.
Therefore, when the switching circuit 1001 receives an instruction indicating that the display device starts to be aged, the switching circuit 1001 may adjust the resistance value of the target resistor to be greater than the preset resistance value, and after a preset duration, adjust the resistance value of the target resistor to be equal to the preset resistance value. In so doing, the output voltage has a correlation with the resistance value of the target resistance.
Based on the connection of the second terminal 2 of the switching circuit 1001 and the first terminal 1 of the control circuit 1002, the switching circuit 1001 can also output a reference voltage (V) whose amplitude is kept constant to the control circuit 1002 from the reception of an instruction indicating the start of aging of the display deviceREF) So that the output voltage (V) isOUT) Is not limited toWill be subject to a reference voltage (V)REF) Is only associated with the resistance value of the target resistor to ensure the output voltage (V)OUT) Stability of (2).
Based on the connection of the second terminal 2 of the control circuit 1002 and the control terminal CON of the boost circuit 1003, the control circuit 1002 may be according to the reference voltage (V)REF) The switching signal is sent to the booster circuit 1003. The switching signal is used to control the charging and discharging of the voltage boost circuit 1003. And the switching signal can be implemented in the form of a digital signal or an analog signal.
The input IN of the boost circuit 1003 may receive an input voltage (V) from a display device or other deviceIN). Further, when the voltage boost circuit 1003 receives the switching signal, the voltage boost circuit 1003 can not only pass the input voltage (V)IN) Storing energy, realizing charging process, and outputting output voltage (V) corresponding to target resistanceOUT) The output voltage (V)OUT) Is a voltage supplied to the gate electrode G of the thin film transistor TFT.
Based on the foregoing, the switching circuit 1001 can not only adjust the resistance of the target resistor, but also output a reference voltage (V) with a constant amplitude to the control circuit 1002REF) So that the control circuit 1002 adopts a reference voltage (V) with constant amplitudeREF) As an output voltage (V)OUT) The reference of (1). Thus, the output voltage (V)OUT) Is associated with the resistance of the target resistor.
When the resistance value of the target resistor is larger than the preset resistance value, outputting a voltage (V)OUT) Is greater than the turn-on voltage (V) of the thin film transistor TFTGH) The amplitude of (c). When the resistance value of the target resistor is equal to the preset resistance value, outputting the voltage (V)OUT) Is equal to the turn-on voltage (V) of the thin film transistor TFTGH) The amplitude of (c).
In a specific embodiment, it is assumed that the gate driving circuit 100 is directly connected to the gate G of the thin film transistor TFT. Then, upon receiving an instruction indicating that aging of the display device is started, the gate driving circuit 100 may transmit a voltage (V) having a magnitude greater than the turn-on voltage (V) of the thin film transistor TFT to the gate electrode G of the thin film transistor TFTGH) Is/are as followsOutput voltage (V)OUT). After a preset time period, the gate driving circuit 100 may transmit a voltage (V) having an amplitude equal to the turn-on voltage of the thin film transistor TFT to the gate G of the thin film transistor TFTGH) Output voltage (V)OUT) The aging of the display device is automatically realized without switching different circuit boards.
In addition, upon receiving an instruction indicating the start of display on the display device, the gate drive circuit 100 may transmit a voltage (V) having a magnitude equal to the turn-on voltage (V) of the thin film transistor TFT to the gate electrode G of the thin film transistor TFTGH) Output voltage (V)OUT) And the requirement of normal display of the display device is met.
The application provides a gate drive circuit receives the instruction through the switching circuit to the target resistance sets up in boost circuit and is connected with boost circuit's output. Based on the connection between the first end of the switching circuit and the output end of the boost circuit, when the switching circuit receives an instruction indicating that the display device starts to be aged, the resistance value of the target resistor can be adjusted to be larger than a preset resistance value, and after a preset duration, the resistance value of the target resistor is adjusted to be equal to the preset resistance value. The switching circuit may further output the reference voltage whose amplitude is kept constant to the control circuit from the reception of an instruction indicating the start of aging of the display device based on the connection of the second terminal of the switching circuit to the first terminal of the control circuit. Based on the connection of the second end of the control circuit and the control end of the boost circuit, the control circuit can send a switching signal to the boost circuit according to the reference voltage, so that the boost circuit can store energy through the received input voltage according to the switching signal and output the output voltage corresponding to the target electricity. When the resistance value of the target resistor is larger than the preset resistance value, the amplitude of the output voltage is larger than the amplitude of the starting voltage of the thin film transistor TFT; when the resistance value of the target resistor is equal to the preset resistance value, the amplitude of the output voltage is equal to the amplitude of the starting voltage of the thin film transistor TFT. In this application, with the help of the resistance of the target resistor connected with the output end of the booster circuit in the adjustment booster circuit, when the display device begins to age, the switching circuit can adjust the resistance of the target resistor to be greater than the preset resistance, so that the gate of the thin film transistor TFT receives the voltage of which the amplitude is greater than the starting voltage of the thin film transistor TFT. After a period of time, the switching circuit can adjust the resistance value of the target resistor to be equal to the preset resistance value, so that the grid electrode of the thin film transistor TFT receives a voltage with the amplitude value equal to the starting voltage of the thin film transistor TFT, and the automatic aging process of the display device is realized. By doing so, not only need not to switch different circuit boards and realize display device's ageing, saved the cost of newly-increased circuit board, reduced display device's hardware cost, also need not to rely on software code output voltage, realized display device's ageing automatically, reduced the productivity loss that leads to because the wrong switching operation, promoted display device's ageing efficiency, saved the cost of programming, and satisfied display device's normal display demand.
In addition to the embodiment shown in fig. 1b, a specific structure of the gate driving circuit 100 of the present application will be described in detail with reference to fig. 2.
In the present application, the switching circuit 1001 may include various implementation forms. Alternatively, as shown in fig. 2, the switching circuit 1001 may include: a first resistor R1, a second resistor R2, a third resistor R3, a first transistor Q1, and a first circuit 10011.
Wherein, a first end of the first resistor R1 is connected to the output terminal OUT of the voltage boost circuit 1003, a second end of the first resistor R1 is connected to the first end 1 of the control circuit 1002, the first end of the second resistor R2 and the first end of the third resistor R3, respectively, for outputting a reference voltage (V) to the control circuit 1002REF) The second terminal of the third resistor R3 is connected to the drain D of the first transistor Q1, the input terminal IN of the first circuit 10011 is used for receiving commands, that is, the input terminal IN of the first circuit 10011 is the third terminal of the switching circuit 1001, the output terminal OUT of the first circuit 10011 is connected to the gate G of the first transistor Q1, and the source S of the first transistor Q1 and the second terminal of the second resistor R2 are both grounded (here, the ground is relative to the input voltage (V)IN) Ground) of the vehicle.
When the first circuit 10011 receives an instruction indicating that aging of the display device is to be started, the first circuit 10011 may turn on the first transistor Q1 such that the second resistor R2 is connected in parallel with the third resistor R3, and the first resistor R1 is connected in series with the second resistor R2 and the third resistor R3 connected in parallel, thereby adjusting the target resistance to (1+ R1/(1/R2+ 1/R3)). After a preset time period, the first circuit 10011 may turn off the first transistor Q1, such that the third resistor R3 is disconnected, and the second resistor R2 is connected in series with the third resistor R3, thereby adjusting the target resistance to (1+ R1/R2).
Since the reference voltage (V) is set after a preset time period has elapsed since the reception of the instruction indicating the start of the aging of the display deviceREF) Is constant and (1+ R1/(1/R2+1/R3)) is greater than (1+ R1/R2), so that when the first circuit 10011 receives a command indicating the start of aging the display device, the output voltage V that can be output by the output terminal OUT of the voltage boost circuit 1003 isOUT＝VREF(1+ R1/(1/R2+ 1/R3)). After a preset time period, the output voltage that the output end OUT of the voltage boost circuit 1003 can output is VOUT＝VREF(1+ R1/R2), and VREF(1+ R1/(1/R2+1/R3)) is greater than VREF(1+ R1/R2) that enables automatic ageing of the display device.
The specific implementation form of the first transistor Q1 is not limited in the present application. Optionally, the first transistor Q1 is an NMOS transistor or an NPN transistor. For convenience of illustration, the first transistor Q1 is illustrated as an NMOS transistor in fig. 2. The first circuit 10011 may be formed by combining a plurality of components, or may also be an integrated chip, which is not limited in this application.
In this application, the boost circuit 1003 may include various implementations. Alternatively, as shown in fig. 2, the voltage boost circuit 1003 may include: the circuit comprises an inductor L, a second transistor Q2, a diode VD, a first capacitor C1, a fourth resistor R4 and a fifth resistor R5.
Wherein the first terminal of the inductor L is used for receiving an input voltage (V)IN) That is, the first terminal of the inductor L is the input terminal IN of the voltage boost circuit 1003, the second terminal of the inductor L is respectively connected to the drain D of the second transistor Q2 and the anode of the diode VD, the source S of the second transistor Q2 is connected to the first terminal of the fourth resistor R4, the gate of the second transistor Q2 is connected to the second terminal 2 of the control circuit 1002, forReceiving a switching signal for turning on or off the second transistor Q2, wherein a cathode of the diode VD is connected to a first terminal of the first capacitor C1 and a first terminal of the fifth resistor R5, respectively, and a second terminal of the fifth resistor R5 is an output terminal OUT of the voltage boost circuit 1003 for outputting an output voltage (V) to the display deviceOUT) The second terminal of the fourth resistor R4 and the second terminal of the first capacitor C1 are both grounded (here, the ground is relative to the input voltage (V)IN) Ground) of the vehicle.
Based on the above connection relationship, the boost circuit 1003 can adjust on/off of the second transistor Q2 under the action of the switching signal, so as to change the switching between the stored energy and the freewheeling of the inductor L. When the second transistor Q2 is turned on, the diode VD is turned off in the reverse direction, and the input voltage (V) is setIN) The inductor L, the second transistor Q2 and the fourth resistor R4 form a closed loop. At this time, the inductor L stores energy. When the second transistor Q2 is turned off, the diode VD is forward biased on and the input voltage (V)IN) The energy stored in the inductor L is simultaneously output to the first capacitor C1 through the second transistor Q2, and an output voltage (V) may be transmitted to the gate G of the thin film transistor TFT through the fifth resistor R5OUT)。
The specific implementation form of the first capacitor C1 is not limited in the present application. For ease of illustration, the first capacitor C1 is illustrated as two capacitors C11 and C12 connected in parallel.
With continued reference to fig. 2, the boost circuit 1003 may further include: a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a sixth resistor R6.
A first end of the second capacitor C2 is connected to the first end of the inductor L, a first end of the sixth resistor R6 is connected to the second end of the inductor L, a second end of the sixth resistor R6 is connected to the first end of the third capacitor C3, a first end of the fourth capacitor C4 is connected between the first end of the first capacitor C1 and the first end of the fifth resistor R5, and a second end of the second capacitor C2, a second end of the third capacitor C3, and a second end of the fourth capacitor C4 are all grounded (here, the ground is relative to the input voltage (V) VIN) Ground) of the vehicle.
In the present application, the second capacitor C2 may be used for dc filtering to ensure the input voltage (V)IN) Is straightAnd (6) galvanic current. The third capacitor C3 and the sixth resistor R6 are connected in series, and mainly function to absorb peak voltage, reduce interference, and provide a signal with a high signal-to-noise ratio for the next stage. The fourth capacitor C4 may each function as a filter.
The capacitance of the second capacitor C2, the capacitance of the third capacitor C3, the capacitance of the fourth capacitor C4, and the resistance of the sixth resistor R6 are not limited in this application.
In the present application, the control circuit 1002 may include various implementations. Alternatively, as shown in fig. 2, the control circuit 1002 may include: a seventh resistor R7, an eighth resistor R8, and a second circuit 10021.
The first terminal 1 of the second circuit 10021 is connected to the second terminal 2 of the switching circuit 1001 for receiving a reference voltage (V)REF) The second terminal 2 of the second circuit 10021 is connected to a first terminal of a seventh resistor R7, a second terminal of the seventh resistor R7 is connected to a first terminal of an eighth resistor R8 and a control terminal of the voltage boost circuit 1003, respectively, for transmitting a switching signal to the voltage boost circuit 1003, and a second terminal of the eighth resistor R8 is grounded (here, the ground is relative to the input voltage (V) to groundIN) Ground) of the vehicle.
In the present application, the second circuit 10021 can receive a reference voltage (V) from the switching circuit 1001REF) And based on a reference voltage (V)REF) And a switching signal is sent to the voltage boosting circuit 1003 through the seventh resistor R7 and the eighth resistor R8, so that the voltage boosting circuit 1003 can realize discharging and charging.
The second circuit 10021 may be formed by combining multiple components, or may also be an integrated chip, which is not limited in this application.
In addition, in order to prevent the voltage boosting circuit 1003 from short-circuiting, the third terminal 3 of the second circuit 10021 is optionally connected between the source S of the second transistor Q2 and the fourth resistor R4. Based on the connection relationship, the second circuit 10021 may obtain the magnitude of the voltage corresponding to the fourth resistor R4, and determine whether the voltage boost circuit 1003 is short-circuited according to the magnitude of the voltage.
When the magnitude of the voltage is greater than or equal to the preset magnitude, the second circuit 10021 may determine that the voltage boost circuit 1003 is not shorted. When the amplitude of the voltage is smaller than the preset amplitude, the second circuit 10021 may determine that the voltage boost circuit 1003 is short-circuited, and may stop transmitting the switching signal to the voltage boost circuit 1003.
The amplitude setting method and the circuit can set the size of the preset amplitude according to experience and circuit actual conditions.
In addition, the third terminal 3 of the second circuit 10021 may also detect whether the second transistor Q2 is in a turned-on state or a turned-off state, so that the second circuit 10021 may determine whether to transmit a switching signal or the like to the voltage boosting circuit 1003 or not based on the detection result.
Illustratively, the present application also provides a liquid crystal panel. Fig. 3 is a schematic structural diagram of a liquid crystal panel according to an embodiment of the present application. As shown in fig. 3, the liquid crystal panel 10 of the present application may include: a thin film transistor TFT200 and a gate driving circuit 100.
The gate driving circuit 100 is connected to the gate G of the thin film transistor TFT200 through a gate line, and is configured to control the thin film transistor TFT to be in an on state or an off state.
The liquid crystal panel 10 may include, but is not limited to, a polarizing plate, a color filter, a liquid crystal layer, a reflective layer, and the like, in addition to the thin film transistor TFT200 and the gate driving circuit 100. For convenience of explanation, the liquid crystal panel 10 in fig. 3 sequentially includes: a horizontal polarizing plate 10A, a color filter 10B, a liquid crystal layer 10C, a thin film transistor TFT200, a vertical polarizing plate 10D, a light guide plate 10E, and a Printed Circuit Board (PCB) 10F on which a gate driving circuit 100 is disposed for illustration.
The liquid crystal panel provided by the present application includes the gate driving circuit of the embodiment shown in fig. 1a, fig. 1b to fig. 2, and the content of the embodiment can be executed, and the specific implementation principle and technical effect thereof can be referred to the above embodiment, which is not described herein again.
The application also provides a display device. Fig. 4 is a schematic structural diagram of a display device according to an embodiment of the present application. As shown in fig. 4, the display device 1 of the present application may include: a housing 20, a backlight module 30 and a liquid crystal panel 10.
The backlight module 30 and the liquid crystal panel 10 are disposed in the housing 20, the backlight module 30 is used for providing light to the liquid crystal panel 10, and the liquid crystal panel 10 is used for displaying an image.
The display device 1 may include, but is not limited to, a liquid crystal television, a liquid crystal projector, or the like. For convenience of explanation, the display device 1 in fig. 4 is illustrated by taking a television as an example.
The display device provided by the present application includes the liquid crystal panel of the embodiment shown in fig. 3, and the liquid crystal panel includes the gate driving circuit of the embodiment shown in fig. 1a, fig. 1 b-fig. 2, and the content of the above embodiment can be executed, and the specific implementation principle and technical effect thereof can be referred to the above embodiment, which is not described herein again.
Illustratively, the present application also provides an aging method. Fig. 5 is a schematic flowchart of an aging method according to an embodiment of the present application. As shown in fig. 5, the aging method of the present application is applied to a gate driving circuit. The method can comprise the following steps:
s101, when an instruction indicating that the display device is aged is received, adjusting the resistance value of the target resistor to be larger than a preset resistance value.
S102, outputting an output voltage corresponding to a target resistor through an input voltage based on a reference voltage, wherein the amplitude of the output voltage is larger than that of a starting voltage of a Thin Film Transistor (TFT) in the display device; wherein the reference voltage is used for feeding back the amplitude of the output voltage.
S103, after the preset duration, adjusting the resistance value of the target resistor to be equal to the preset resistance value.
And S104, outputting an output voltage corresponding to the target resistance through an input voltage based on the reference voltage with the amplitude kept unchanged, wherein the amplitude of the output voltage is equal to the amplitude of the starting voltage of a Thin Film Transistor (TFT) in the display device.
Optionally, the aging method of the present application may further include: when an instruction indicating that the display device starts to be displayed is received, adjusting the resistance value of the target resistor to be equal to a preset resistance value; and outputting an output voltage corresponding to the target resistance through the input voltage based on the reference voltage.
The aging method provided by the present application is applied to the gate driving circuits of the embodiments shown in fig. 1a, fig. 1b and fig. 2, and the contents of the above embodiments can be executed, and specific implementation principles and technical effects thereof can be referred to the above embodiments, which are not described herein again.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (11)

1. A gate drive circuit, comprising:
a first pin of the gate drive circuit configured to receive an input voltage;
the second pin of the gate driving circuit is configured to adjust the resistance value of the target resistor to be larger than a preset resistance value when receiving an instruction indicating that the display device starts to be aged; after a preset time length, adjusting the resistance value of the target resistor to be equal to the preset resistance value;
a third pin of the gate driving circuit, configured to output an output voltage corresponding to a target resistance through the input voltage based on a reference voltage whose amplitude remains unchanged, the reference voltage being used for feeding back the amplitude of the output voltage;
when the resistance value of the target resistor is larger than the preset resistance value, the amplitude of the output voltage is larger than the amplitude of the starting voltage of a Thin Film Transistor (TFT) in the display device; when the resistance value of the target resistor is equal to the preset resistance value, the amplitude of the output voltage is equal to the amplitude of the starting voltage of a Thin Film Transistor (TFT) in the display device;
the gate driving circuit includes: the circuit comprises a switching circuit, a control circuit and a booster circuit;
the input end of the boost circuit is used for receiving input voltage, the first end of the switching circuit is connected with the output end of the boost circuit, the target resistor is arranged in the boost circuit and is connected with the output end of the boost circuit, the second end of the switching circuit is connected with the first end of the control circuit, the third end of the switching circuit is used for receiving instructions, and the second end of the control circuit is connected with the control end of the boost circuit;
the switching circuit is used for adjusting the resistance value of the target resistor to be larger than the preset resistance value when receiving an instruction for indicating that the display device is aged, and adjusting the resistance value of the target resistor to be equal to the preset resistance value after the preset time;
the switching circuit is further used for outputting the reference voltage with the constant amplitude to the control circuit from the moment of receiving an instruction for starting aging of the display device;
the control circuit is used for sending a switching signal to the boosting circuit based on the reference voltage;
and the booster circuit is used for storing energy through the input voltage according to the switching signal and outputting the output voltage corresponding to the target resistor.
2. The circuit of claim 1, wherein the switching circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a first transistor and a first circuit;
a first end of the first resistor is connected to an output end of the boost circuit, a second end of the first resistor is connected to a first end of the control circuit, a first end of the second resistor and a first end of the third resistor, respectively, and is configured to output the reference voltage to the control circuit, a second end of the third resistor is connected to a drain of the first transistor, an input end of the first circuit is configured to receive an instruction, an output end of the first circuit is connected to a gate of the first transistor, and a source of the first transistor and a second end of the second resistor are both grounded;
the first circuit is used for turning on the first transistor when receiving an instruction for starting aging of the display device; and after the preset time, cutting off the first transistor.
3. The circuit of claim 2, wherein the first transistor is an NMOS transistor or an NPN transistor.
4. The circuit of claim 1, wherein the boost circuit comprises: the circuit comprises an inductor, a second transistor, a diode, a first capacitor, a fourth resistor and a fifth resistor;
the first end of the inductor is used for receiving the input voltage, the second end of the inductor is connected with the drain of the second transistor and the anode of the diode respectively, the source of the second transistor is connected with the first end of the fourth resistor, the gate of the second transistor is connected with the second end of the control circuit and used for receiving the switching signal, the switching signal is used for switching on or switching off the second transistor, the cathode of the diode is connected with the first end of the first capacitor and the first end of the fifth resistor respectively, the second end of the fifth resistor is the output end of the boost circuit and used for outputting the output voltage to the display device, and the second end of the fourth resistor and the second end of the first capacitor are both grounded.
5. The circuit of claim 4, wherein the boost circuit further comprises: the second capacitor, the third capacitor, the fourth capacitor and the sixth resistor;
the first end of the second capacitor is connected with the first end of the inductor, the first end of the sixth resistor is connected with the second end of the inductor, the second end of the sixth resistor is connected with the first end of the third capacitor, the first end of the fourth capacitor is connected between the first end of the first capacitor and the first end of the fifth resistor, and the second end of the second capacitor, the second end of the third capacitor and the second end of the fourth capacitor are all grounded.
6. The circuit of claim 4, wherein the control circuit comprises: a seventh resistor, an eighth resistor and a second circuit;
the first end of the second circuit is connected to the second end of the switching circuit, and is configured to receive the reference voltage, the second end of the second circuit is connected to the first end of the seventh resistor, the second end of the seventh resistor is respectively connected to the first end of the eighth resistor and the control end of the voltage boost circuit, and is configured to send the switching signal to the voltage boost circuit, and the second end of the eighth resistor is grounded.
7. The circuit of claim 6, wherein a third terminal of the second circuit is connected to the source of the second transistor;
the second circuit is further configured to obtain an amplitude of a voltage corresponding to the fourth resistor; and determining whether the boost circuit is short-circuited according to the amplitude of the voltage.
8. A liquid crystal panel, comprising: a thin film transistor TFT and a gate driving circuit as claimed in any one of claims 1 to 7;
the gate driving circuit is connected with the gate of the thin film transistor TFT through a gate line and is used for controlling the thin film transistor TFT to be in an open state or a closed state.
9. A display device, comprising: a housing, a backlight module and a liquid crystal panel according to claim 8;
the backlight module and the liquid crystal panel are arranged in the shell, the backlight module is used for providing a light source for the liquid crystal panel, and the liquid crystal panel is used for displaying image pictures.
10. A burn-in method applied to the gate driver circuit according to any one of claims 1 to 7; the method comprises the following steps:
when an instruction indicating that the display device starts to be aged is received, adjusting the resistance value of the target resistor to be larger than a preset resistance value;
outputting an output voltage corresponding to the target resistance through an input voltage based on a reference voltage, wherein the amplitude of the output voltage is larger than that of a starting voltage of a Thin Film Transistor (TFT) in the display device; wherein the reference voltage is used for feeding back the amplitude of the output voltage;
after a preset time length, adjusting the resistance value of the target resistor to be equal to the preset resistance value;
and outputting an output voltage corresponding to the target resistance through the input voltage based on the reference voltage with the amplitude kept unchanged, wherein the amplitude of the output voltage is equal to the amplitude of the turn-on voltage of a Thin Film Transistor (TFT) in the display device.
11. The method of claim 10, further comprising:
when an instruction indicating that the display device starts to display is received, adjusting the resistance value of the target resistor to be equal to the preset resistance value;
and outputting an output voltage corresponding to the target resistance through the input voltage based on the reference voltage.
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