Anti-static interference circuit, screen module, display panel and electronic equipment

Abstract

The utility model relates to an anti-static interference circuit, a screen module, a display panel and electronic equipment. The anti-static interference circuit is connected with a pixel circuit row in the display panel, the pixel circuit row comprises a plurality of pixel circuits arranged in the row direction, the anti-static interference circuit comprises a comparison circuit, and the input end of the comparison circuit is connected with a target voltage source and a reference voltage source; the comparison circuit is used for comparing target voltage output by the target voltage source with reference voltage output by the reference voltage source and then outputting a comparison signal, and the switch driving circuit is connected with the output end of the comparison circuit so as to output a control signal based on the comparison signal; and the switching circuit is arranged in the driving voltage input circuit, the driving voltage input circuit is connected with each pixel circuit in the pixel circuit row so as to input grid driving voltage to each pixel circuit, and the switching circuit is connected with the switching driving circuit so as to be switched on and switched off according to the control signal. By adopting the circuit, the screen shaking phenomenon can be avoided.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and particularly to an anti-static interference circuit, a screen module, a display panel, and an electronic device. Background Art

[0002] With the development of LCD (Liquid Crystal Display) technology, LCD screens have many advantages such as low energy consumption, good display effect, flexible size, and moderate price. Therefore, more and more vehicle manufacturers use LCD screens as the display devices for vehicles.

[0003] However, according to the image transmission principle of LCD screens, when an LCD screen is displaying normally, one frame of a picture is a single frame, and each frame is assigned a voltage from top to bottom in sequence for each row of row data signals. When a certain frame of image is interfered by static electricity, the voltage of the row data signal may fluctuate, resulting in an error in the row data signal. Therefore, a screen shaking phenomenon may occur. Screen shaking means that the screen picture shakes, such as the appearance of vertical white bars ghosting in the screen picture area, or local ghosting in a certain area, etc. Summary of the Utility Model

[0004] Based on this, in view of the above technical problems, it is necessary to provide an anti-static interference circuit, a screen module, a display panel, and an electronic device that can reduce the screen shaking phenomenon.

[0005] In a first aspect, the present application provides an anti-static interference circuit. The anti-static interference circuit is connected in series with a pixel circuit in a display panel. The pixel circuit series includes a plurality of pixel circuits arranged in a row direction. The anti-static interference circuit includes:

[0006] A comparison circuit, the input terminals of the comparison circuit are respectively connected to a target voltage source and a reference voltage source, so as to compare the target voltage output by the target voltage source and the reference voltage output by the reference voltage source and then output a comparison signal. The target voltage is the gate driving voltage input to the pixel circuit series, and the reference voltage is the gate reference voltage of the pixel circuit series in a normal state;

[0007] A switch driving circuit, the switch driving circuit is connected to the output terminal of the comparison circuit, so as to output a control signal based on the comparison signal;

[0008] A switch circuit, which is arranged in a driving voltage input circuit. The driving voltage input circuit is connected to each pixel circuit in the pixel circuit series to input a gate driving voltage to each pixel circuit. The switch circuit is connected to the switch driving circuit to conduct and cut off according to the control signal.

[0009] In one embodiment, the comparison circuit includes a first comparison circuit and a second comparison circuit;

[0010] The input terminals of the first comparison circuit are respectively connected to the target voltage source and the first reference voltage source, and the first reference voltage source outputs the first reference voltage; the input terminals of the second comparison circuit are respectively connected to the target voltage source and the second reference voltage source, and the second reference voltage source outputs the second reference voltage;

[0011] The output terminal of the first comparison circuit is connected to the first input terminal of the switch driving circuit, and the output terminal of the second comparison circuit is connected to the second input terminal of the switch driving circuit.

[0012] In one embodiment, the first comparison circuit includes a first conversion circuit and a first comparator;

[0013] The input terminals of the first conversion circuit are respectively connected to the target voltage source and the first reference voltage source to convert the target voltage and the first reference voltage into digital signals;

[0014] The input terminal of the first comparator is connected to the output terminal of the first conversion circuit to compare the digital signals after the conversion of the target voltage and the first reference voltage and then output a first comparison signal.

[0015] In one embodiment, the second comparison circuit includes a second conversion circuit and a second comparator;

[0016] The input terminals of the second conversion circuit are respectively connected to the target voltage source and the second reference voltage source to convert the target voltage and the second reference voltage into digital signals;

[0017] The input terminal of the second comparator is connected to the output terminal of the second conversion circuit to compare the digital signals after the conversion of the target voltage and the second reference voltage and then output a second comparison signal.

[0018] In one embodiment, the switch driving circuit is an OR circuit;

[0019] The OR circuit outputs a first control signal when the first comparison signal output by the first comparison circuit is at the first level or the second comparison signal is at the first level to control the switch circuit to conduct;

[0020] The OR circuit outputs a second control signal when the first comparison signal output by the first comparison circuit is at the second level and the second comparison signal is at the second level to control the switch circuit to turn off.

[0021] In one embodiment, the switch circuit includes a first switching transistor, and the control electrode of the first switching transistor is connected to the switch driving circuit.

[0022] In one embodiment, the driving voltage input circuit includes a driving voltage source and a first resistor. The driving voltage source is connected to the first resistor, the first resistor is connected to each pixel circuit, the first resistor is further connected to the first pole of the first switching transistor, and the second pole of the first switching transistor is grounded.

[0023] In one embodiment, the output terminal of the second comparator is connected to the switch driving circuit after being inverted.

[0024] In a second aspect, the present application also provides a screen module, which includes the anti-static interference circuit as described in any one of the above first aspects.

[0025] In a third aspect, the present application also provides a display panel, which includes the screen module as described in the above second aspect.

[0026] In a fourth aspect, the present application also provides an electronic device, which includes the display panel as described in the above third aspect.

[0027] For the above anti-static interference circuit, screen module, display panel and electronic device, the anti-static interference circuit is connected to the pixel circuit rows in the display panel. The pixel circuit rows include a plurality of pixel circuits arranged in the row direction. The anti-static interference circuit includes: a comparison circuit, the input terminals of the comparison circuit are respectively connected to a target voltage source and a reference voltage source to compare the target voltage output by the target voltage source and the reference voltage output by the reference voltage source and then output a comparison signal. The target voltage is the gate driving voltage input to the pixel circuit rows, and the reference voltage is the gate reference voltage of the pixel circuit rows in the normal state; a switch driving circuit, the switch driving circuit is connected to the output terminal of the comparison circuit to output a control signal based on the comparison signal; a switch circuit, which is arranged in the driving voltage input circuit. The driving voltage input circuit is connected to each pixel circuit in the pixel circuit rows to input the gate driving voltage to each pixel circuit. The switch circuit is connected to the switch driving circuit to conduct and cut off according to the control signal. In this way, the target voltage and the reference voltage are compared and then the comparison signal is output, and the control signal is output according to the comparison signal to control the conduction and cut-off of the switch circuit, so as to control whether the driving voltage input circuit inputs the gate driving voltage to each pixel circuit. It can be understood that when the target voltage is affected by static electricity, the driving voltage input circuit is controlled not to input the gate driving voltage to each pixel circuit, so as to avoid the static electricity from affecting each pixel circuit and avoid the occurrence of screen shaking phenomenon. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments of the present application or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a schematic structural diagram of the TFT transistors inside the screen module in one embodiment;

[0030] Figure 2 It is a schematic structural diagram of an anti-static interference circuit in an embodiment;

[0031] Figure 3 It is a schematic structural diagram of a comparison circuit in another embodiment;

[0032] Figure 4 It is a schematic structural diagram of an anti-static interference circuit in another embodiment;

[0033] Figure 5 It is a schematic structural diagram of an anti-static interference circuit in another embodiment;

[0034] Figure 6 It is a schematic structural diagram of an anti-static interference circuit in another embodiment;

[0035] Figure 7 It is a block diagram of the structure of an electronic device in an embodiment.

[0036] Description of main component numbers:

[0037] Anti-static interference circuit 100; Pixel circuit 200; Driving voltage input circuit 300;

[0038] Comparison circuit 10; Switch driving circuit 20; Switch circuit 30;

[0039] First comparison circuit 110; Second comparison circuit 120;

[0040] First conversion circuit 111; First comparator 112;

[0041] Second conversion circuit 121; Second comparator 122;

[0042] First switching transistor Q1; First circuit R1. Detailed implementation manners

[0043] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0045] It will be understood that the terms "first", "second", etc. used in the present application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of the present application, the first resistor may be referred to as the second resistor, and similarly, the second resistor may be referred to as the first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0046] It will be understood that for "connection" in the following embodiments, if there is an electrical signal or data transfer between the connected circuits, modules, units, etc., it should be understood as "electrical connection", "communication connection", etc.

[0047] It will be understood that "at least one" means one or more, and "a plurality" means two or more. "At least part of an element" means part or all of the element.

[0048] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the related listed items.

[0049] Currently, the screen shaking phenomena that occur when the LCD screen is interfered by static electricity include the following: (1) Jitter appears in a certain area of the LCD screen and can automatically recover after the interference is removed. (2) Fine horizontal white stripes appear at the bottom of the LCD screen and can automatically recover after the interference is removed. In order to prevent the screen shaking phenomenon from occurring when the LCD screen is interfered by static electricity, the video data transmission link of the LCD screen is analyzed. At present, most LCD screens cooperate with the vehicle head unit control system to achieve the transmission of video data, and the vehicle head unit control system controls the LCD screen to work through I2C transparent transmission.

[0050] The in-vehicle infotainment (IVI) control system is transmitted to the serializer through the CSI (Camera Serial Interface) protocol. The serializer transmits high-speed video signals to the deserializer on the LCD screen side through the forward channel according to a dedicated video link transmission protocol. Some control signals of the deserializer are transmitted to the serializer side through the reverse channel at the same time. Among them, the rate of the forward channel is generally 3 Gbps / 6 Gbps, while the reverse channel is generally 187 Mbps. Taking the TI deserializer as an example, the video link transmission protocol of the TI deserializer is FPD LINK III&IV (serial bus solution). After the SerDes (Serializer and Deserialize) differential signals are transmitted to the deserializer through the FPD_LINK protocol, the deserializer will output EDP (Embedded DisplayPort) signals to the TCON (Timing Controller) chip at the rear stage. After being converted by the TCON chip, LVDS (Low-Voltage Differential Signaling) differential signals are output, providing corresponding data and control signals for the rear stage of the screen specifically.

[0051] The LVDS differential signals converted by the TCON chip are transmitted to the source integrated circuit SOUICE IC and the gate integrated circuit GATE IC inside the screen module. The SOUICE IC and the GATE IC drive different magnitudes of polar voltages. The SOUICE IC drives the source voltage of the thin film transistor (TFT) inside the module, and the GATE IC drives the gate voltage of the TFT inside the module. By controlling the magnitudes of the gate voltage and the source voltage, the source and drain of the TFT are turned on and off. When the source voltages are different, the liquid crystal inside the TFT will deflect continuously, causing each pixel inside to present different gray levels and brightness, and finally realizing real-time imaging on the screen.

[0052] Therefore, the transmission process of the above video data is: IVI control system → serializer → video harness → deserializer → TCON → screen module (SOUICE IC and GATE IC) → screen body. Except for the video harness and the screen body, all the above parts are active devices. Since the video harness is generally shielded twisted pair, the probability of being affected by static electricity is relatively small, and the screen body itself is also passive, so the probability of being affected by static electricity is relatively small. Therefore, the screen jitter phenomenon caused by static interference may be a problem in other active modules.

[0053] To confirm which of the above modules is affected by electrostatic interference during video link transmission, the above modules are sequentially put into the BIST mode for confirmation. The BIST mode is a self-test mode in screen link debugging. When a certain module enters the BIST mode, a self-test screen will appear on the LCD screen, that is, by modifying the register values in the chip specification book, a fixed standard pattern or a polling switching screen can appear. For example, the standard Figure 1 generally refers to a fixed-color screen, such as a fixed red, fixed yellow, fixed green, etc. The polling switching screen means that the screen image sequentially displays pictures such as red → green → blue → white → black at a certain time period. Taking the appearance of the standard pattern as an example:

[0054] When a certain module enters the above BIST mode, only this module will normally perform video data stream transmission work, and the remaining modules will not work, only existing physical connections. After separately putting the serializer, deserializer, TCON chip, and screen module into the BIST mode and applying electrostatic interference, it is found that all modules will experience screen shaking when entering the BIST mode. Since the screen module is the last-stage module of the screen, if the serializer, deserializer, or TCON chip is affected by electrostatic interference resulting in screen shaking, then when separately entering the BIST mode of the screen module, the screen will not show screen shaking. Therefore, it can be determined that the screen shaking phenomenon is caused by the screen module being affected by electrostatic interference.

[0055] Analyze the display of the LCD screen. The pictures or graphics displayed on the LCD screen are essentially the filling of each pixel point. The entire screen is divided into horizontal and vertical directions. During the internal data transmission process of the screen module, first, a row of pixel points is filled completely. After filling a row, the next row of pixel points is filled, and so on. The filling order is: from left to right, from top to bottom. When all the pixel points on the entire LCD screen are filled, one frame of an image is displayed. Usually, an image is not a single color but an interaction of multiple colors. Therefore, the above pixel points themselves can display different color lights. Different color lights are achieved by continuously deflecting the liquid crystal voltage, controlled by the internal electric field, and combined with the characteristics of the polarizer to control the light of each pixel point. Each pixel point contains three TFT tubes, and the three TFT tubes respectively control the three primary colors of red R, green G, and blue B. By controlling the voltages of each polarity of the TFT tubes, the different deflections of the liquid crystal are further controlled. At a certain timing, the three pixel points of R\G\B will be superimposed into any displayed color.

[0056] The above-mentioned screen shaking phenomenon means that during the transmission of each frame of image, when an error occurs in the data of a certain row, after the entire pixel is filled, due to the existence of error data in this frame of image, the spliced image of this frame will show the screen shaking phenomenon in the human eye. That is, the brightness in some pixels has unexpected changes, and the internal liquid crystal deflection angle is incorrect, resulting in abnormal display of the image in a certain part, that is, screen shaking.

[0057] The deflection of the liquid crystal inside the LCD screen is achieved by controlling the different voltages applied across the liquid crystal. Generally, TFT transistors are used to control the deflection voltage of the liquid crystal, such as Figure 1 The figure shows a schematic diagram of the TFT transistors inside the screen module in the normal state. The gate G of the TFT is connected to the GATE IC of the screen, the source S of the TFT transistor is connected to the SOUICE IC of the screen, and the voltage between the drain D of the TFT and GND realizes the deflection of the liquid crystal. The magnitude of the drain voltage directly determines the different gray levels and brightness inside the pixel. Figure 1 Each MOS transistor in the figure represents a TFT transistor, and three TFT transistors form a pixel.

[0058] In view of this, to reduce the screen shaking phenomenon, the gate driving voltage input to each pixel circuit row is compared with the reference voltage, and then a comparison signal is output. According to the comparison signal, a control signal is output to control the conduction and cutoff of the switching circuit, so as to control whether the driving voltage input circuit inputs the gate driving voltage to each pixel circuit. It can be understood that when the target voltage is affected by static electricity, the driving voltage input circuit is controlled not to input the gate driving voltage to each pixel circuit, thereby avoiding the influence of static electricity on each pixel circuit and preventing the occurrence of the screen shaking phenomenon.

[0059] The embodiment of the present application provides an anti-static interference circuit 100, as Figure 2 shown. The anti-static interference circuit 100 is connected to the pixel circuit rows in the display panel. The pixel circuit rows include a plurality of pixel circuits 200 arranged along the row direction. The anti-static interference circuit 100 includes: a comparison circuit 10. The input terminals of the comparison circuit 10 are respectively connected to the target voltage source Vdec and the reference voltage source Vref to compare the target voltage output by the target voltage source Vdec and the reference voltage output by the reference voltage source Vref, and then output a comparison signal.

[0060] When the LCD screen involves multiple line transmissions, if the TFT transistors of the previous line are in the on state and the TFT transistors of the next line are in the off state under the specified timing. After being actually interfered by static electricity, if the TFT transistors of the next line are mis-conducted and remain in the on state, the data transmission of the previous line will continue to be maintained on this line at this time. After the pixel points are spliced, double images will appear up and down on the screen, that is, the screen shaking phenomenon. When the above-mentioned multiple lines are transmitted, the mis-conduction or mis-turn-off of the TFT transistors of each line is determined by the gate driving voltage of this line. Therefore, it is possible to judge whether there is static electricity interference by monitoring the gate driving voltage.

[0061] Among them, the target voltage is the gate driving voltage input to the pixel circuit row, and the reference voltage is the gate reference voltage of the pixel circuit row under normal conditions. The target voltage is also the actual GATE IC pin voltage, and the reference voltage is the gate reference voltage under normal conditions, which can include the voltage when conducting and the voltage when turning off. After comparing the target voltage with the reference voltage, a comparison signal is output. Optionally, it is judged whether the difference between the target voltage and the reference voltage is within a preset range. If so, it is determined that the target voltage is consistent with the reference voltage. If not, it is determined that the target voltage is inconsistent with the reference voltage, that is, the target voltage may be interfered by static electricity.

[0062] The switch driving circuit 20, the switch driving circuit 20 is connected to the output end of the comparison circuit 10 to output a control signal based on the comparison signal; the switch circuit 30 is arranged in the driving voltage input circuit 300, and the driving voltage input circuit 300 is connected to each pixel circuit 200 in the pixel circuit row to input the gate driving voltage to each pixel circuit 200. The switch circuit 30 is connected to the switch driving circuit 20 to conduct and turn off according to the control signal.

[0063] Among them, the driving voltage input circuit 300 is used to input the gate driving voltage to each pixel circuit 200. The switch driving circuit 20 outputs a control signal according to the comparison signal. Optionally, when the comparison signal indicates that the target voltage is consistent with the reference voltage, a control signal is output to control the switch circuit 30 to turn off. When the switch circuit 30 is turned off, the driving voltage input circuit 300 normally inputs the gate driving voltage to each pixel circuit 200. When the comparison signal indicates that the target voltage is inconsistent with the reference voltage, a control signal is output to control the switch circuit 30 to conduct. When the switch circuit 30 is conducting, the driving voltage input circuit 300 is grounded through the switch circuit 30 and does not input the gate driving voltage to each pixel circuit 200, that is, the transmission of this line is paused, thereby avoiding being interfered by static electricity.

[0064] In the above embodiments, the anti-static interference circuit is connected in series with the pixel circuits in the display panel. The pixel circuit series includes a plurality of pixel circuits arranged in the row direction. The anti-static interference circuit includes: a comparison circuit, the input terminals of the comparison circuit are respectively connected to the target voltage source Vdec and the reference voltage source Vref, so as to compare the target voltage output by the target voltage source Vdec and the reference voltage output by the reference voltage source Vref and then output a comparison signal. The target voltage is the gate driving voltage input to the pixel circuit series, and the reference voltage is the gate reference voltage of the pixel circuit series in the normal state; a switch driving circuit, the switch driving circuit is connected to the output terminal of the comparison circuit to output a control signal based on the comparison signal; a switch circuit, which is arranged in the driving voltage input circuit. The driving voltage input circuit is connected to each pixel circuit in the pixel circuit series to input the gate driving voltage to each pixel circuit. The switch circuit is connected to the switch driving circuit to conduct and cut off according to the control signal. In this way, the target voltage and the reference voltage are compared and then a comparison signal is output. The control signal is output according to the comparison signal to control the conduction and cut-off of the switch circuit, so as to control whether the driving voltage input circuit inputs the gate driving voltage to each pixel circuit. It can be understood that when the target voltage is affected by static electricity, the driving voltage input circuit is controlled not to input the gate driving voltage to each pixel circuit, thereby avoiding the static electricity from affecting each pixel circuit and avoiding the occurrence of screen shaking phenomenon.

[0065] In one embodiment, as Figure 3 shown, the comparison circuit 10 includes a first comparison circuit 110 and a second comparison circuit 120.

[0066] The input terminals of the first comparison circuit 110 are respectively connected to the target voltage source Vdec and the first reference voltage source Vref1, and the first reference voltage source Vref1 outputs the first reference voltage; the input terminals of the second comparison circuit 120 are respectively connected to the target voltage source Vdec and the second reference voltage source Vref2, and the second reference voltage source Vref2 outputs the second reference voltage; the output terminal of the first comparison circuit 110 is connected to the first input terminal of the switch driving circuit 20, and the output terminal of the second comparison circuit 120 is connected to the second input terminal of the switch driving circuit 20.

[0067] Among them, the first reference voltage is the gate reference voltage Vg = 15V when conducting in the normal state, and the second reference voltage is the gate reference voltage Vg = -15V when turning off in the normal state. In the conducting case, the first comparison circuit 110 compares the target voltage with the first reference voltage. Optionally, if the value of the target voltage Vdec < 0.8Vref (12V) or Vdec > 1.2Vref (18V), it indicates that the GATE IC pin of the gate drive voltage has been affected by electrostatic interference at this time. In the turning-off case, the second comparison circuit 120 compares the target voltage with the second reference voltage. Optionally, if the value of the target voltage Vdec > 0.8Vref (-12V) or Vdec < 1.2Vref (-18V), it indicates that the GATE IC pin of the gate drive voltage has been affected by electrostatic interference at this time.

[0068] The first comparison circuit 110 and the second comparison circuit 120 are connected to the switch drive circuit 20 and output the comparison signals to the switch drive circuit 20.

[0069] In the above embodiments, through the first comparison circuit and the second comparison circuit, the monitoring of the target voltage is realized, and it is possible to judge whether it is affected by electrostatic interference according to the target voltage.

[0070] Optionally, please continue to refer to Figure 3 As shown, the first comparison circuit 110 includes a first conversion circuit 111 and a first comparator 112; the input terminals of the first conversion circuit 111 are respectively connected to the target voltage source Vdec and the first reference voltage source Vref1 to convert the target voltage and the first reference voltage into digital signals; the input terminal of the first comparator 112 is connected to the output terminal of the first conversion circuit 111 to compare the digital signals after the conversion of the target voltage and the first reference voltage and then output a first comparison signal.

[0071] Optionally, please continue to refer to Figure 3 , the second comparison circuit 120 includes a second conversion circuit 121 and a second comparator 122; the input terminals of the second conversion circuit 121 are respectively connected to the target voltage source Vdec and the second reference voltage source Vref2 to convert the target voltage and the second reference voltage into digital signals; the input terminal of the second comparator 122 is connected to the output terminal of the second conversion circuit 121 to compare the digital signals after the conversion of the target voltage and the second reference voltage and then output a second comparison signal.

[0072] Optionally, the output terminal of the second comparator 122 is connected to the switch drive circuit 20 after being inverted.

[0073] Among them, the first conversion circuit 111 and the second conversion circuit 112 may include analog-to-digital conversion chips. The first conversion circuit 111 can convert the target voltage and the first reference voltage into digital signals and then output them to the first comparator 112. The second conversion circuit 112 can convert the target voltage and the second reference voltage into digital signals and then output them to the second comparator 122.

[0074] The first comparator 112 compares the digital signals converted from the target voltage and the first reference voltage and then outputs a first comparison signal. Optionally, when the target voltage is not affected by electrostatic interference, the first comparison signal can be a low level. When the target voltage is affected by electrostatic interference, the first comparison signal can be a high level. The second comparator 122 compares the digital signals converted from the target voltage and the second reference voltage and then outputs a second comparison signal. Optionally, when the target voltage is not affected by electrostatic interference, the second comparison signal can be a low level. When the target voltage is affected by electrostatic interference, the second comparison signal can be a high level.

[0075] In one embodiment, the switch driving circuit 20 is an OR circuit. The OR circuit outputs a first control signal to control the switch circuit 30 to conduct when the first comparison signal output by the first comparison circuit 110 is a first level or the second comparison signal is a first level. The OR circuit outputs a second control signal to control the switch circuit 30 to turn off when the first comparison signal output by the first comparison circuit 110 is a second level and the second comparison signal is a second level.

[0076] Among them, the switch driving circuit 20 can be an OR gate circuit. The output terminal of the OR circuit is connected to the switch circuit 30 to control the conduction and turn-off of the switch circuit 30. The input signals of the OR circuit are the first comparison signal and the second comparison signal. Optionally, the first level is a high level and the second level is a low level. When one of the first comparison signal and the second comparison signal is a high level, that is, the target voltage is affected by electrostatic interference, the switch driving circuit 20 outputs a high level to control the switch circuit 30 to conduct. When both the first comparison signal and the second comparison signal are low levels, that is, the target voltage is not affected by electrostatic interference, the switch driving circuit 20 outputs a low level to control the switch circuit 30 to turn off.

[0077] In one embodiment, as Figure 4 shown, the switch circuit 30 includes a first switch transistor Q1, and the control electrode of the first switch transistor Q1 is connected to the switch driving circuit 20.

[0078] The driving voltage input circuit 300 includes a driving voltage source Vref and a first resistor R1. The driving voltage source Vref is connected to the first resistor R1. The first resistor R1 is connected to each pixel circuit 200. The first resistor R1 is also connected to the first pole of the first switch transistor Q1, and the second pole of the first switch transistor Q1 is grounded.

[0079] Among them, the first switching transistor Q1 can be an NMOS transistor. When the target voltage is not affected by static electricity, the control signal output by the switching drive circuit 20 is at a low level, controlling the first switching transistor Q1 of the switching circuit 30 to turn off. The drive voltage source Vref of the drive voltage input circuit 300 is connected to each pixel circuit 200 through the resistor R1, providing a gate drive voltage for the TFT transistors of each pixel circuit 200. The TFT transistors are turned on, and the row transmission is carried out normally. When the target voltage is affected by static electricity, the control signal output by the switching drive circuit 20 is at a high level, controlling the first switching transistor Q1 of the switching circuit 30 to turn on. The drive voltage source Vref of the drive voltage input circuit 300 is grounded through the resistor R1 and the first switching transistor Q1. At this time, the TFT transistors of each pixel circuit 200 are not turned on, and the current row transmission is paused.

[0080] In the embodiment of the present application, as Figure 5 shown, it is a schematic structural diagram of the anti-static interference circuit 100. The first conversion circuit 111 is an analog-to-digital conversion chip ADC_1. The first reference voltage is the gate reference voltage Vref1 = 15V when the TFT transistor is turned on. After being converted by the first conversion circuit ADC_1, the D1 pin of the ADC_1 chip outputs a low-level digital signal "0". If the target voltage changes significantly, such as Vdec < 0.8Vref1 (12V) or Vdec > 1.2Vref1 (18V), that is, it is affected by static electricity. At this time, the D2 pin of the ADC_1 chip will output a high-level digital signal. If the actually detected voltage Vdec satisfies 0.8Vref1 ≤ Vdec ≤ 1.2Vref1, it indicates that the GATE IC pin is not affected by static electricity. At this time, the D2 pin of the ADC_1 chip outputs a low-level signal.

[0081] The second conversion circuit 121 is an analog-to-digital conversion chip ADC_2, and the second reference voltage is the gate reference voltage Vref2 = -15V when the TFT transistor is turned off. After being converted by the ADC_2 chip, the D1 pin of the ADC_2 chip outputs a low-level digital signal "0". If the value of the target voltage is Vdec > 0.8Vref2 (-12V) or Vdec < 1.2Vref2 (-18V), it indicates that the GATE IC pin has been affected by static electricity. At this time, the D2 pin of the second conversion circuit ADC_2 outputs a high level. Since the second reference voltage outputs a low level after being converted by the converter, if the actually detected voltage Vdec satisfies 0.8Vref2 ≤ Vdec ≤ 1.2Vref2, it indicates that the GATE IC pin is not affected by static electricity. At this time, the D2 pin of the ADC_2 chip outputs a low-level signal.

[0082] The digital level signals output by the above ADC_1 and ADC_2 are compared by the first comparator 112 and the second comparator 122. When the two ends of the comparator are at different electrical levels, the output of the comparator will trigger a high level, indicating that the GATE IC pin has been affected by electrostatic discharge. When the first comparator 112 or the second comparator 122 outputs a high level, the OR gate K1 of the switch driving circuit 20 outputs a high level. At this time, the gate voltage of the first switching transistor Q1 is at a high level, and the value of this high-level voltage Vg needs to be higher than 15V. As a result, the first switching transistor Q1 conducts, and the source voltage of Q1 will be directly pulled down. This point voltage is the gate voltage of the TFT transistors Q2, Q3, Q4, and Q5 of the first row of pixel circuits in the row transfer. At this time, since the Vgs of Q2, Q3, Q4, and Q5 is at a low level after being pulled down, the TFT transistors do not conduct, and the transfer of this row is paused.

[0083] When the two ends of the comparator are both at a low level, it indicates that the GATE IC pin has not been affected by electrostatic discharge. At this time, both the first comparator 112 and the second comparator 122 output a low level, the OR gate K1 of the switch driving circuit 20 outputs a low level, and the gate voltage of the first switching transistor Q1 is at a low level. The NMOS transistor Q1 does not conduct. At this time, the gate voltage of the subsequent TFT transistors Q2, Q3, Q4, and Q5 in the row transfer is Vref = 15V. At this time, Vg > Vs, and the row transfer proceeds normally.

[0084] In the above embodiment, when a mis-turn-off occurs during row transfer, the first switching transistor Q1 of the switch circuit is turned on by the first conversion circuit and the first comparator outputting a high level, thereby pulling down the gate voltage of the TFT transistors of the pixel circuit, ensuring that the TFT transistors of the pixel circuit are turned off, pausing the transfer of this row, and maintaining the previous row of images. When a mis-conduction occurs during row transfer, the first switching transistor Q1 of the switch circuit is not turned on by the second conversion circuit and the second comparator inverting and outputting a low level, and the TFT transistors in the pixel circuit of this row continue to be maintained in the off state. Therefore, no abnormal screen shaking phenomenon will occur in the actual image, meeting the electrostatic requirements.

[0085] In one embodiment, as Figure 6 shown, when multiple pixel circuits are in row transfer, by adding an anti-static interference circuit 100 to each row, the monitoring and control of the gate voltage are realized, and mis-conduction or mis-turn-off caused by electrostatic influence is avoided. The anti-static interference circuit 100 added to each row is as described in the above embodiment.

[0086] In the embodiments of the present application, a screen module is further provided, as Figure 7 shown, and this screen module includes the anti-static interference circuit as described in the above embodiment.

[0087] In the embodiments of the present application, a display panel is further provided, as Figure 7As shown, the display panel includes the screen module as described in the above embodiments.

[0088] In an embodiment of the present application, an electronic device is further provided, such as Figure 7 As shown, the electronic device includes the display panel as described in the above embodiments.

[0089] In the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", "ideal embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0090] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in the present application.

[0091] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. An anti-static interference circuit, characterized in that: The anti-static interference circuit is connected to a pixel circuit row in the display panel, the pixel circuit row includes a plurality of pixel circuits arranged along a row direction, and the anti-static interference circuit includes: a comparison circuit, wherein the input end of the comparison circuit is respectively connected to a target voltage source and a reference voltage source, so as to compare a target voltage output by the target voltage source with a reference voltage output by the reference voltage source and then output a comparison signal, wherein the target voltage is a gate driving voltage input to the pixel circuit row, and the reference voltage is a gate reference voltage of the pixel circuit row in a normal state; a switch driving circuit connected to an output terminal of the comparison circuit to output a control signal based on the comparison signal; The switch circuit is arranged in the driving voltage input circuit, the driving voltage input circuit is connected to each pixel circuit in the pixel circuit row to input the gate driving voltage to each pixel circuit, and the switch circuit is connected to the switch driving circuit to be turned on and off according to the control signal.

2. The anti-static interference circuit according to claim 1, characterized in that: The comparison circuit includes a first comparison circuit and a second comparison circuit; The input terminal of the first comparison circuit is connected to the target voltage source and a first reference voltage source respectively, and the first reference voltage source outputs a first reference voltage; The input terminal of the second comparison circuit is connected to the target voltage source and the second reference voltage source respectively, and the second reference voltage source outputs a second reference voltage; The output end of the first comparison circuit is connected to the first input end of the switch driving circuit, and the output end of the second comparison circuit is connected to the second input end of the switch driving circuit.

3. The anti-static interference circuit according to claim 2, characterized in that: The first comparison circuit includes a first conversion circuit and a first comparator; The input end of the first conversion circuit is connected to the target voltage source and the first reference voltage source respectively to convert the target voltage and the first reference voltage into digital signals; The input end of the first comparator is connected to the output end of the first conversion circuit to compare the target voltage with the digital signal converted from the first reference voltage and then output a first comparison signal.

4. The anti-static interference circuit according to claim 3, characterized in that: The second comparison circuit includes a second conversion circuit and a second comparator; The input end of the second conversion circuit is connected to the target voltage source and the second reference voltage source respectively to convert the target voltage and the second reference voltage into digital signals; The input end of the second comparator is connected to the output end of the second conversion circuit to compare the target voltage with the digital signal converted from the second reference voltage and output a second comparison signal.

5. The anti-static interference circuit according to claim 4, characterized in that: The switch driving circuit is an OR circuit; The OR circuit outputs a first control signal to control the switch circuit to be turned on when the first comparison signal output by the first comparison circuit is at a first level or the second comparison signal is at the first level; The OR circuit outputs a second control signal to control the switch circuit to be turned off when the first comparison signal output by the first comparison circuit is at the second level and the second comparison signal is at the second level.

6. The anti-static interference circuit according to claim 5, characterized in that: The switch circuit includes a first switch tube, and a control electrode of the first switch tube is connected to the switch driving circuit.

7. The anti-static interference circuit according to claim 6, characterized in that: The driving voltage input circuit includes a driving voltage source and a first resistor, the driving voltage source is connected to the first resistor, the first resistor is connected to each of the pixel circuits, the first resistor is also connected to the first electrode of the first switching tube, and the second electrode of the first switching tube is grounded.

8. The anti-static interference circuit according to claim 4, characterized in that: The output terminal of the second comparator is inverted and connected to the switch driving circuit.

9. A screen module, characterized in that: The screen module includes an anti-static interference circuit as described in any one of claims 1 to 8 above.

10. A display panel, characterized in that: The display panel comprises the screen module as claimed in claim 9.

11. An electronic device, characterized in that: The electronic device comprises the display panel as claimed in claim 10 above.

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