WO2023246043A1

WO2023246043A1 - Control circuit and display device

Info

Publication number: WO2023246043A1
Application number: PCT/CN2022/141076
Authority: WO
Inventors: 李德怀; 王惠奇; 康报虹
Original assignee: 惠科股份有限公司
Priority date: 2022-06-23
Filing date: 2022-12-22
Publication date: 2023-12-28
Also published as: CN115101020A; CN115101020B

Abstract

The present application provides a control circuit and a display device. The control circuit comprises a first switch; a first end of the first switch is used for receiving a turn-off voltage signal; a second end of the first switch is used for outputting the turn-off voltage signal when the first switch is turned on; the turn-off voltage signal is used for turning off an array substrate. The control circuit further comprises a regulation module (4); the regulation module (4) comprises a temperature measurement unit (401) and a regulation unit (402); and the regulation unit (402) is respectively connected to the temperature measurement unit (401) and the first switch. The temperature measurement unit (401) is used for measuring the temperature of the array substrate, and determining a compensation voltage according to the temperature of the array substrate; and the regulation unit (402) is used for regulating a voltage of the turn-off voltage signal according to the compensation voltage.

Description

Control circuit and display device

[Cross-reference to related applications]

This application claims priority from Chinese patent application CN202210719408.9 submitted on June 23, 2022, the entire content of which is incorporated herein by reference.

【Technical field】

The present application relates to the field of display technology, and in particular, to a control circuit and a display device.

【Background technique】

Liquid Crystal Display (LCD) will have afterimages when working for a long time. That is, when the LCD switches the displayed images, an afterimage of one frame of image will remain on the monitor. When the LCD residual image is severe, it will affect the LCD display effect.

[Content of the invention]

This application provides a control circuit and a display device that can reduce the risk of residual images in LCD under high temperature conditions.

In a first aspect, this application provides a control circuit applied to a display panel. The display panel includes an array substrate and a counter substrate arranged oppositely. The control circuit includes a first switch, and the first end of the first switch is used to receive a shutdown voltage. signal, the second end of the first switch is used to output a turn-off voltage signal when the first switch is turned on, and the turn-off voltage signal is used to turn off the array substrate. The control circuit also includes an adjustment module, and the adjustment module includes a temperature detection unit and an adjustment unit. unit and the adjustment unit are respectively connected with the temperature detection unit and the first switch. The temperature detection unit is used to detect the temperature of the array substrate and determine the compensation voltage according to the temperature of the array substrate. The adjustment unit is used to adjust the voltage of the turn-off voltage signal according to the compensation voltage.

In a second aspect, the present application also provides a display device, which includes any optional control circuit of the first aspect.

The control circuit provided by this application is provided with an adjustment module, which is connected to the first switch and can adjust the voltage of the shutdown voltage signal according to the temperature of the array substrate, so that at any temperature, the shutdown voltage signal input to the array substrate The voltage is the preset standard turn-off voltage at the corresponding temperature, thereby avoiding an increase in the leakage current of the TFTs in the TFT array substrate to a certain extent, thereby avoiding the phenomenon of LCD display afterimages due to an increase in leakage current under high temperatures.

The structure of the present application as well as its other purposes and beneficial effects will be described in detail in conjunction with the accompanying drawings to ensure that the description of the preferred embodiments is more obvious and understandable.

[Picture description]

In order to explain the technical solutions in the embodiments of the present application more clearly, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on these drawings without exerting any creative effort.

Figure 1 is a schematic structural diagram of a control circuit provided in Embodiment 1 of the present application;

Figure 2 is a schematic structural diagram 2 of the control circuit provided in Embodiment 1 of the present application;

Figure 3 is a schematic diagram of changes in leakage current provided by Embodiment 1 of the present application;

Figure 4 is a schematic structural diagram of the first temperature sensor module provided in Embodiment 1 of the present application;

Figure 5 is a schematic structural diagram 3 of the control circuit provided in Embodiment 1 of the present application;

Figure 6 is a schematic structural diagram 4 of the control circuit provided in Embodiment 1 of the present application;

Figure 7 is a schematic structural diagram 5 of the control circuit provided in Embodiment 1 of the present application;

Figure 8 is a schematic structural diagram 6 of the control circuit provided in Embodiment 1 of the present application;

FIG. 9 is a schematic structural diagram of a control circuit provided in Embodiment 1 of the present application.

【Detailed ways】

In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clear, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

It should be understood that the terms "length", "width", "top", "bottom", "front", "back", "left", "right", "vertical", "horizontal", "top" The orientations or positional relationships indicated by "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply the device referred to. Or elements must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations on the application.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise explicitly and specifically limited.

In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures and technologies are provided to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, and circuits are omitted so as not to obscure the description of the present application with unnecessary detail.

A liquid crystal display panel usually includes an array substrate, a counter substrate and a liquid crystal layer, where the liquid crystal layer is located between the array substrate and the counter substrate.

In the LCD, a control circuit (also called a TFT switch circuit) is usually provided to output the turn-on voltage (V gate high, VGH) and turn-off voltage (V gate low, VGL) to the array substrate to control the TFT. Turning on and off enables the LCD to switch images. Among them, VGH and VGL are the gate control voltages of the TFTs in the array substrate. VGH is generally a positive voltage of 13 to 20V (volts), which can turn on the gate of the TFT. VGL is generally a negative voltage of -7.3~-10V, which can turn off the gate of the TFT.

For example, as shown in Figure 1, it is a schematic diagram of a control circuit in an LCD, including a level translator 1, a first MOS transistor 2 and a second MOS transistor 3. Among them, the level converter 1 is connected to the gates of the first MOS transistor 2 and the second MOS transistor 3. After receiving the digital signal, the level converter 1 converts the digital signal into a data voltage and outputs it to the first MOS transistor 2 and the second MOS transistor. 3. The level converter 1 controls the on-off state of the first MOS transistor 2 and the second MOS transistor 3 through the output data voltage.

The source of the first MOS transistor 2 is used to receive the turn-on voltage (V gate high, VGH), and the drain is connected to the array substrate. The drain of the second MOS transistor 3 is used to receive the turn-off voltage (V gate low, VGL), and the source is connected to the array substrate. VGH and VGL can be output by corresponding voltage generation modules (for example, power integrated circuits (power IC)).

When the first MOS transistor 2 is turned on and the second MOS transistor 3 is turned off, for example, when the data voltage output by the level converter 1 is 3.3V, the first MOS transistor 2 is turned on and the second MOS transistor 3 is turned off. The control circuit outputs VGH to the array substrate through the first MOS transistor 2 to drive the TFT in the array substrate to turn on, thereby causing the LCD to display.

When the first MOS transistor 2 is turned off and the second MOS transistor 3 is turned on, for example, when the data voltage output by the level converter 1 is 0V, the first MOS transistor 2 is turned off and the second MOS transistor 3 is turned on. The control circuit outputs VGL to the array substrate through the second MOS transistor 3 to drive the TFT in the array substrate to turn off, so that the LCD does not display.

At present, LCD may have residual images when working for a long time. The reason is that the leakage current Ioff of the TFT increases at high temperatures, causing polarization of the liquid crystal, resulting in afterimages. By exploring and analyzing the reasons why the leakage current Ioff of the TFT increases, the applicant of this application discovered the relationship between the leakage current Ioff and VGL. That is, as the temperature increases, the turn-off voltage VGL of the TFT will drift. That is to say, compared with the turn-off voltage at normal temperature (assumed to be expressed as VGL1), the turn-off voltage VGL of the TFT at high temperature will Increase or decrease (that is, VGL is smaller than VGL1, or VGL is larger than VGL1). If the control circuit still controls the gate of the TFT to turn off through the output VGL1 under a high temperature state, the leakage current Ioff of the TFT will increase.

To this end, the present application provides a control circuit and a display device that can adjust the shutdown voltage according to the temperature of the array substrate to avoid an increase in leakage current to a certain extent, thereby avoiding to a certain extent problems caused by leakage current under high temperature conditions. There is an afterimage phenomenon in the LCD.

The following is an exemplary introduction to the control circuit and display device provided by this application with reference to the accompanying drawings.

Embodiment 1

The control circuit provided by the embodiment of the present application includes a first switch and an adjustment module. Wherein, the first switch is a switch used to control the array substrate to turn off, a first end of the first switch is used to receive a turn-off voltage signal, and a second end of the first switch is used to output the turn-off voltage signal when the first switch is turned on. A turn-off voltage signal is used to turn off the array substrate.

For example, the first switch may be the second MOS transistor 3 in the control circuit as shown in Figure 1. Correspondingly, the first terminal is the drain of the second MOS transistor 3, and the second terminal is the drain of the second MOS transistor 3. source. It can also be understood that the first switch can also be a P-type MOS transistor, a switching diode or other switching transistors. For this reason, this application does not impose specific limitations.

In the embodiment of the present application, the control circuit is provided with an adjustment module, which is connected to the first switch and can adjust the voltage of the shutdown voltage signal according to the temperature of the array substrate, so that at any temperature, the shutdown voltage input to the array substrate The voltage of the voltage signal is the preset standard turn-off voltage at the corresponding temperature, thereby avoiding an increase in the leakage current of the TFTs in the TFT array substrate to a certain extent, thereby avoiding the LCD display afterimage caused by the increase in leakage current at high temperatures. Phenomenon.

The adjustment module may include a temperature detection unit and an adjustment unit. The adjustment unit is connected to the temperature detection unit and the first switch respectively. The temperature detection unit 402 is used to detect the temperature of the array substrate and determine the compensation voltage according to the temperature of the array substrate. For example, the compensation voltage may be the difference between the shutdown voltage VGL1 at normal temperature and the preset standard shutdown voltage at the corresponding temperature. The adjustment unit can adjust the voltage of the turn-off voltage signal according to the compensation voltage.

The control circuit provided by this application will be exemplified below by taking the first switch being the second MOS transistor 3 as an example.

Assume that the standard shutdown voltage at the corresponding temperature is expressed as VGL, and the voltage of the shutdown voltage signal output by the voltage generation module is expressed as VGL1 (that is, the shutdown voltage at normal temperature). Among them, at normal temperature, VGL1 is equal to VGL. When the temperature of the array substrate increases, the VGL of the array substrate at this high temperature is not equal to VGL1.

In one example, the circuit diagram of the control circuit can be shown in Figure 2. The first input end 402a of the adjustment unit 402 in the adjustment module 4 is connected to the temperature detection unit 401, and the second input end 402b of the adjustment unit 402 is used to receive the switch. The output terminal 402c of the adjustment unit 402 is connected to the first terminal b. The adjustment unit 402 is specifically configured to adjust the voltage of the shutdown voltage signal received by the second input terminal 402b according to the compensation voltage. The shutdown voltage signal received by the second input terminal 402b is the shutdown voltage signal output by the voltage generating module, that is, the voltage of the shutdown voltage signal received by the second input terminal 402b is VGL1 at normal temperature.

In this example, the adjustment module 4 can be connected to the first terminal b of the first switch 3, and before the shutdown voltage signal is input to the first switch 3, the voltage of the shutdown voltage signal is adjusted, so that the first switch 3 receives The voltage of the turn-off voltage signal is the standard turn-off voltage VGL at the corresponding temperature, thereby enabling the first switch 3 to directly output the standard turn-off voltage VGL at the corresponding temperature to the array substrate in the on state.

Among them, the standard turn-off voltage VGL at the corresponding temperature can be obtained statistically in advance. For example, as shown in Figure 3, it is a graph showing the relationship between the gate control voltage of the TFT and the leakage current Ioff. Statistically, under different temperatures, the gate control voltage that minimizes the leakage current Ioff is the standard turn-off voltage VGL.

For example, it is assumed that at normal temperature (for example, 23° C.), the standard turn-off voltage of TFT is -7V (that is, VGL1 = -7V). When the temperature of the array substrate rises to 40°C, assuming that the preset standard shutdown voltage at this temperature is -8V (volt), the temperature detection unit 401 can output -1V as the compensation voltage according to the detected temperature, and the adjustment unit 402 can weight the compensation voltage -1V with VGL1 at normal temperature, that is -1-7=-8V, and then output the corresponding standard shutdown voltage -8V at 40°C to the array substrate to control the TFT shutdown. It avoids always controlling the array substrate to be turned off through VGL1, causing the leakage current Ioff to increase and causing afterimages.

The temperature detection unit 401 is used to detect the temperature of the array substrate and convert the detected temperature of the array substrate into a compensation voltage at this temperature. In one example, as shown in Figure 4, the temperature detection unit 401 may include a temperature sensor 4011 and a compensation module 4012. The temperature sensor 4011 is connected to the third input terminal 4013a of the compensation module 4012, and the fourth input terminal 4013b of the compensation module 4012 is used. In order to receive the shutdown voltage signal (that is, it can be connected to the voltage sending module for outputting the shutdown voltage signal, and the voltage of the shutdown voltage signal is VGL1 at this time), the output terminal 401a of the compensation module 4012 and the first input of the adjustment unit 402 Terminal 402a is connected.

In the embodiment of the present application, the temperature sensor 4011 is used to sense the ambient temperature (ie, the temperature of the array substrate), and convert the detected temperature of the control circuit into a high-precision voltage signal output. The compensation module 4012 is used to determine the compensation voltage VGL2 according to the high-precision voltage signal output by the temperature sensor 4011 and the voltage VGL1 of the turn-off voltage signal.

In this example, the temperature sensor 4011 can be set according to pre-statistical standard turn-off voltages at different temperatures, so that the temperature sensor 4011 can output a high-precision voltage signal according to the preset conversion relationship between temperature and voltage. It can be understood that the voltage of the high-precision voltage signal is the standard shutdown voltage VGL at the corresponding temperature.

In one example, as shown in Figure 4, the compensation module 4012 may include a comparator 4013 and a second switch 4014. One input terminal 4013a of the comparator 4013 is the third input terminal 4013a of the compensation module 4012. The other input terminal 4013a of the comparator 4013 is The input terminal 4013b is the fourth input terminal 4013b of the compensation module 4012. The output terminal of the comparator 4013 is connected to one terminal of the second switch 4014. The other terminal of the second switch 4014 is the output terminal 401a of the compensation module 4012.

The second switch may be a P-type transistor as shown in Figure 2, or other types of transistors, switching diodes, or resonant soft switches. This application does not limit this.

For example, assuming that at normal temperature (for example, 23° C.), the standard turn-off voltage VGL of the TFT is -7V (that is, VGL=VGL1=-7V). At 40°C, the corresponding standard shutdown voltage VGL is VGL3 = -8V. When the temperature sensor 4011 detects that the temperature of the array substrate rises to 40° C., the temperature sensor 4011 can output VGL3 according to the preset conversion relationship between temperature and voltage, and output VGL3 to the comparator 4013.

The comparator 4013 can compare the received VGL3 and VGL1 to determine the compensation voltage VGL2=VGL3-VGL1=-8+7=-1V. The comparator 4013 outputs the compensation voltage VGL2 to the second switch 4014.

Optionally, if the absolute value of the compensation voltage VGL2 is less than a preset threshold (for example, 0.1, 0.3, etc.), the comparator 4013 may not output the compensation voltage VGL2.

The second switch 4014 is turned on when receiving the compensation voltage VGL2, and outputs VGL2 to the adjustment unit 402.

In one example, the adjustment unit may include a first operational amplifier and a second operational amplifier. The non-inverting input terminal of the first operational amplifier is connected to the first temperature detection unit. The inverting input terminal of the first operational amplifier is connected to ground. The first operational amplifier The output terminal is connected to the inverting input terminal of the second operational amplifier, and the non-inverting input terminal of the second operational amplifier is used to receive the shutdown voltage VGL, that is, the non-inverting input terminal of the second operational amplifier is the second input terminal of the adjustment unit. The output terminal of the second operational amplifier is connected to the first terminal b of the MOS transistor, that is, the output terminal of the second operational amplifier is the output terminal of the adjustment unit.

Exemplarily, the circuit diagram of the adjustment unit 402 can be shown in Figure 4. The adjustment unit 402 specifically includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first operational amplifier A1 and a second operational amplifier. Amplifier A2. One end of the first resistor R1 is connected to ground, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the output terminal A1a of the first operational amplifier A1, and one end of the third resistor R3 is connected to the ground. The output terminal A1a of the first operational amplifier A1 is connected, the other end of the third resistor R3 is connected to the output terminal A2a of the second operational amplifier A2, and one end of the fourth resistor R4 is connected to the non-inverting input of the second operational amplifier A2 (as shown in Figure 3 Indicates that the "+" end of A2) is connected.

The "+" terminal of the first operational amplifier A1 is used to receive the compensation voltage output by the first temperature detection unit 401, amplify and calibrate the compensation voltage and then output it to the second operational amplifier A2.

Optionally, the first operational amplifier A1 may be a non-inverting operational amplifier. The non-inverting operational amplifier has strong stability, so that the compensation voltage received by the “+” terminal of the first operational amplifier A1 is amplified and calibrated and then output through the output terminal A1a.

The "-" terminal of the second operational amplifier A2 is used to receive the compensation voltage signal output by the first operational amplifier A1, and the "+" terminal is used to receive the shutdown voltage. The second operational amplifier A2 weights the compensation voltage with VGL1 (i.e., compensates The voltage is added to VGL1) and then output to the first terminal b of the first switch 3 to obtain the standard shutdown voltage at the corresponding temperature.

Optionally, the second operational amplifier A2 can be an integrated operational amplifier, which can realize the purpose of weighting the voltages received by the "-" terminal and the "+" terminal of the second operational amplifier A2 and then outputting them.

For example, assuming that at normal temperature (for example, 23° C.), the standard turn-off voltage VGL of the TFT is -7V (that is, VGL=VGL1=-7V). At 40°C, the corresponding standard shutdown voltage VGL is VGL3 = -8V. When the temperature sensor 4011 detects that the temperature of the array substrate rises to 40°C, the temperature detection unit 401 can output the compensation voltage VGL2 to the first operational amplifier A1, and the first operational amplifier A1 performs calibration processing on VGL2 and outputs it to the second operational amplifier. A2, the second operational amplifier A2 weights VGL2 and VGL1, that is, VGL3=VGL2+VGL1=-7+-1=-8V. In this way, the second operational amplifier A2 outputs VGL3 to the array substrate.

In one example, in order to enable the standard turn-off voltage VGL output by the adjustment unit 402 to be stably output to the first terminal b of the first switch, as shown in FIG. 6 , a first buffer A3 may be provided in the adjustment unit 402. The inverting input terminal of the buffer A3 (the "-" terminal of A3 as shown in Figure 6) is connected to the output terminal A1a of the second operational amplifier A2, and the output terminal A3a of the first buffer A3 is connected to the first terminal of the first switch 3. Connected to terminal b. Setting the first buffer A3 at the output terminal A1a of the second operational amplifier A2 can, to a certain extent, prevent the next-stage input (first switch 3 The signal loss occurs when the impedance of the first terminal b) is small.

It can be understood that in the embodiment of the present application, the adjustment module 4 can adjust the turn-off voltage signal input to the first terminal b of the first switch 3 as shown in Figure 2, and can also adjust the second terminal of the first switch 3. The shutdown voltage signal output from terminal c is adjusted.

For example, in another example, the circuit diagram of the control circuit can also be as shown in Figure 7. The first input terminal 402a of the adjustment unit 402 is connected to the temperature detection unit 401, and the second input terminal 402b of the adjustment unit 402 is connected to the second terminal c. connection, the output end of the adjustment unit 402 is connected to the array substrate, and the adjustment unit 402 is specifically configured to adjust the voltage of the turn-off voltage signal received by the second input end 402b according to the compensation voltage. The voltage of the turn-off voltage signal received by the adjustment unit 402 is VGL1 at normal temperature.

In this example, the adjustment module 4 can adjust the voltage of the turn-off voltage signal received by the first switch 3 so that the voltage of the turn-off voltage signal received by the first switch 3 is the standard turn-off voltage at the corresponding temperature. , and then the voltage output to the array substrate is the standard shutdown voltage VGL.

The specific structure of the temperature detection unit 401 can be referred to the structure shown in FIG. 5 above, and will not be described again here.

In one example, the adjustment unit includes a third operational amplifier and a fourth operational amplifier. The non-inverting input terminal of the third operational amplifier is connected to the temperature detection unit, the inverting input terminal of the third operational amplifier is connected to ground, the output terminal of the third operational amplifier is connected to the inverting input terminal of the fourth operational amplifier, and the non-inverting input terminal of the fourth operational amplifier is connected to the ground. The input terminal is the second input terminal of the adjustment unit, and the output terminal of the fourth operational amplifier is the output terminal of the adjustment unit.

Exemplarily, the circuit diagram of the adjustment unit 402 can be shown in Figure 8. The adjustment unit 402 also includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a third operational amplifier A4 and a fourth operational amplifier. Amplifier A5. One end of the first resistor R1 is connected to ground, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the output terminal A4a of the third operational amplifier A4, and one end of the third resistor R3 is connected to the ground. The output terminal A4a of the third operational amplifier A4 is connected, the other end of the third resistor R3 is connected to the output terminal A3a of the fourth operational amplifier A5, and one end of the fourth resistor R4 is connected to the non-inverting input terminal of the fourth operational amplifier A5 (as shown in Figure 8 The "+" terminal of A5 shown) is connected.

Among them, the "+" terminal of the third operational amplifier A4 is used to receive the compensation voltage output by the temperature detection unit 401, amplify and calibrate the compensation voltage and then output it to the fourth operational amplifier A5.

Optionally, the third operational amplifier A4 can be a non-inverting operational amplifier. The non-inverting operational amplifier has strong stability, so that the compensation voltage signal received by the “+” terminal of the third operational amplifier A4 is amplified and calibrated and then output through the output terminal A4a.

The "-" terminal of the fourth operational amplifier A5 is used to receive the compensation voltage signal output by the third operational amplifier A4, and the "+" terminal is used to receive the shutdown voltage signal output by the second terminal c of the first switch 5. The fourth operational amplifier A5 Amplifier A5 weights the compensation voltage and the turn-off voltage signal (that is, adds the compensation voltage signal and the turn-off voltage signal) and outputs it to the array substrate to obtain the standard turn-off voltage at the corresponding temperature.

Optionally, the fourth operational amplifier A5 can be an integrated operational amplifier, so that the voltages received by the "-" terminal and the "+" terminal of the fourth operational amplifier A5 can be weighted and output.

In one example, in order to enable the shutdown voltage VGL output by the adjustment unit 402 to be stably output to the array substrate, as shown in FIG. 9 , a second buffer A6 may be provided in the adjustment unit 402, and the inverting input of the second buffer A6 The terminal (the "-" terminal of A6 as shown in Figure 9) is connected to the output terminal A4a of the fourth operational amplifier A53, and the output terminal A6a of the second buffer A6 is connected to the array substrate. Setting the second buffer A6 after the output terminal A4a of the fourth operational amplifier A5 can, to a certain extent, prevent the input of the next stage (i.e. the array substrate) from being affected by the high impedance of the output (i.e. the output terminal of the fourth operational amplifier A5). ) Signal loss occurs when the impedance is small.

Embodiment 2

Embodiment 2 of the present application also provides a display device. The display device includes at least one control circuit as described in Embodiment 1.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application. scope.

Claims

A control circuit applied to a display panel. The display panel includes an array substrate and a counter substrate arranged oppositely. The control circuit includes a first switch. The first end of the first switch is used to receive a turn-off voltage signal. The second end of the first switch is used to output the turn-off voltage signal when the first switch is turned on, and the turn-off voltage signal is used to turn off the array substrate, wherein the control circuit further includes Adjustment module, the adjustment module includes a temperature detection unit and an adjustment unit, the adjustment unit is connected to the temperature detection unit and the first switch respectively;

The temperature detection unit is used to detect the temperature of the array substrate and determine the compensation voltage according to the temperature of the array substrate;

The adjustment unit is used to adjust the voltage of the turn-off voltage signal according to the compensation voltage.
The control circuit according to claim 1, wherein the first input end of the adjustment unit is connected to the temperature detection unit, the second input end of the adjustment unit is used to receive the shutdown voltage signal, and the The output end of the adjustment unit is connected to the first end, and the adjustment unit is specifically configured to adjust the voltage of the shutdown voltage signal received by the second input end according to the compensation voltage.
The control circuit according to claim 2, wherein the voltage of the shutdown voltage signal received by the second input terminal is a shutdown voltage under normal temperature.
The control circuit according to claim 1, wherein the adjustment module is connected to a first end of the first switch, and before the shutdown voltage signal is input to the first switch, the shutdown voltage signal is voltage to adjust.
The control circuit according to claim 2, wherein the adjustment unit includes a first operational amplifier and a second operational amplifier;

The non-inverting input terminal of the first operational amplifier is connected to the temperature detection unit, the inverting input terminal of the first operational amplifier is connected to ground, and the output terminal of the first operational amplifier is connected to the inverting terminal of the second operational amplifier. The input terminals are connected, the non-inverting input terminal of the second operational amplifier is the second input terminal of the adjustment unit, and the output terminal of the second operational amplifier is the output terminal of the adjustment unit.
The control circuit according to claim 5, wherein the adjustment unit further includes a first resistor, a second resistor, a third resistor and a fourth resistor;

One end of the first resistor is connected to ground, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to the output end of the first operational amplifier, and the second end of the second resistor is connected to the ground. One end of the three resistors is connected to the output end of the first operational amplifier, the other end of the third resistor is connected to the output end of the second operational amplifier, and one end of the fourth resistor is connected to the second operational amplifier. connected to the non-inverting input terminal.
The control circuit according to claim 6, wherein the non-inverting input terminal of the first operational amplifier is used to receive the compensation voltage output by the temperature detection unit, amplify and calibrate the compensation voltage and then output it to the third operational amplifier. Two operational amplifiers.
The control circuit according to claim 6, wherein the first operational amplifier is a non-inverting operational amplifier, and the second operational amplifier is an integrated operational amplifier.
The control circuit according to claim 5, wherein the adjustment unit further includes a first buffer, an inverting input terminal of the first buffer is connected to the output terminal of the second operational amplifier, and the first buffer The output terminal of the buffer is the output terminal of the adjustment unit.
The control circuit according to claim 1, wherein the first input end of the adjustment unit is connected to the temperature detection unit, the second input end of the adjustment unit is connected to the second end, and the adjustment unit The output end is used to be connected to the array substrate, and the adjustment unit is specifically used to adjust the voltage of the turn-off voltage signal received by the second input end according to the compensation voltage.
The control circuit according to claim 10, wherein the adjustment module adjusts the voltage of the turn-off voltage signal received by the first switch, so that the turn-off voltage received by the first switch The voltage of the signal is the standard shutdown voltage at the corresponding temperature.
The control circuit according to claim 1, wherein the adjustment unit includes a third operational amplifier and a fourth operational amplifier;

The non-inverting input terminal of the third operational amplifier is connected to the temperature detection unit, the inverting input terminal of the third operational amplifier is connected to ground, and the output terminal of the third operational amplifier is connected to the inverting terminal of the fourth operational amplifier. The input terminals are connected, the non-inverting input terminal of the fourth operational amplifier is the second input terminal of the adjustment unit, and the output terminal of the fourth operational amplifier is the output terminal of the adjustment unit.
The control circuit according to claim 12, wherein the non-inverting input terminal of the third operational amplifier is used to receive the compensation voltage output by the temperature detection unit, amplify and calibrate the compensation voltage and then output it to the third operational amplifier. Quad operational amplifiers.
The control circuit according to claim 13, wherein the third operational amplifier is a non-inverting operational amplifier, and the fourth operational amplifier is an integrated operational amplifier.
The control circuit according to claim 12, wherein the adjustment unit further includes a second buffer, an inverting input terminal of the second buffer is connected to the output terminal of the fourth operational amplifier, and the second buffer The output terminal of the buffer is the output terminal of the adjustment unit.
The control circuit according to claim 1, wherein the temperature detection unit includes a temperature sensor and a compensation module, the temperature sensor is connected to the third input terminal of the compensation module, and the fourth input terminal of the compensation module is In receiving the shutdown voltage signal, the output end of the compensation module is connected to the first input end of the adjustment unit;

The temperature sensor is used to convert the temperature of the control circuit into a voltage signal and output it to the compensation module, and the compensation module is used to determine the compensation voltage according to the voltage signal and the shutdown voltage signal.
The control circuit according to claim 16, wherein the compensation module includes a comparator and a second switch, one input terminal of the comparator is a third input terminal of the compensation module, and the other input terminal of the comparator is a third input terminal of the comparator. The input terminal is the fourth input terminal of the compensation module, the output terminal of the comparator is connected to one terminal of the second switch, and the other terminal of the second switch is the output terminal of the compensation module.
The control circuit according to claim 17, wherein the first switch is a transistor of metal-oxide-semiconductor structure; the second switch is a triode.
The control circuit of claim 18, wherein:

The first terminal of the first switch is the drain of the transistor of the metal-oxide-semiconductor structure, and the second terminal of the first switch is the source of the transistor of the metal-oxide-semiconductor structure;
A display device, wherein the display device includes a control circuit, the control circuit is applied to a display panel in the display device, the display panel includes an array substrate and a counter substrate arranged oppositely, the control circuit includes a first switch , the first end of the first switch is used to receive a turn-off voltage signal, and the second end of the first switch is used to output the turn-off voltage signal when the first switch is turned on. The voltage signal is used to turn off the array substrate, wherein the control circuit further includes an adjustment module, the adjustment module includes a temperature detection unit and an adjustment unit, the adjustment unit is connected to the temperature detection unit and the first switch connection;

The temperature detection unit is used to detect the temperature of the array substrate and determine the compensation voltage according to the temperature of the array substrate;

The adjustment unit is used to adjust the voltage of the turn-off voltage signal according to the compensation voltage.