Display panel detection method, display device and central control circuit

Abstract

The present application provides a display panel detection method, a display device, and a central control circuit. The gate opening voltage VGH of the display panel is V1. The display panel detection method includes: electrically connecting the display panel to the central control circuit, where the central control circuit includes a power management circuit and a sensing circuit that are electrically connected to each other, and in response to the sensing circuit satisfying a preset condition, the power management circuit outputs a gate opening voltage VGH higher than V1 to the display panel; and making the sensing circuit satisfy the preset condition. Under the condition of keeping the operating temperature of the display panel at normal temperature, the present application forces the sensing circuit of a normal central control circuit to satisfy the preset condition by artificial means to perform an aging test, without the need for a dedicated test central control circuit, simplifying the process and reducing the production cost.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel detection method, a display device and a central control circuit. Background Art

[0002] A display panel, such as a liquid crystal display panel, includes multiple pixels, and each pixel has a specific service life. If some pixels are continuously displayed in high brightness, the corresponding pixel life will be exhausted prematurely, and the display brightness will decay prematurely, eventually leading to inconsistent brightness in different areas of the display panel. Therefore, before the display panel leaves the factory, it is usually necessary to use a special test center control board (CB) for aging testing, which makes the preparation process of the display panel complicated. Summary of the invention

[0003] The main technical problem solved by the present application is to provide a display panel detection method, a display device and a central control circuit, so as to solve the problem that the aging test cannot be performed after the central control board and the display panel are bound in the prior art.

[0004] In order to solve the above technical problems, the first technical solution provided by the present application is: to provide a detection method for a display panel, wherein the gate opening voltage VGH of the display panel is V 1 ,include:

[0005] The display panel is electrically connected to the central control circuit; the central control circuit includes a power management circuit and a sensing circuit electrically connected to each other, wherein, in response to the sensing circuit meeting a preset condition, the gate opening voltage VGH output by the power management circuit to the display panel is higher than V 1 ;

[0006] Make the sensing circuit meet the preset conditions.

[0007] The sensing circuit is a temperature sensing circuit, and the power management circuit is used to obtain a voltage VT at an input terminal of the temperature sensing circuit, wherein in response to the voltage VT at the input terminal of the temperature sensing circuit meeting a preset voltage threshold, the power management circuit outputs a gate opening voltage VGH higher than V 1 ;

[0008] The step of making the sensing circuit meet the preset conditions includes: under the condition of keeping the operating temperature of the display panel at normal temperature, inputting a voltage that meets the preset voltage threshold to the input end of the temperature sensing circuit under the condition of keeping the operating temperature of the display panel at normal temperature.

[0009] The temperature sensing circuit includes a thermistor, in response to a voltage VT at an input end of the temperature sensing circuit being less than or equal to a first preset voltage V a, the gate opening voltage VGH output by the power management circuit to the display panel is V 1 In response to the voltage VT at the input terminal of the temperature sensing circuit being greater than or equal to the second preset voltage V b , the gate opening voltage VGH output by the power management circuit to the display panel is V 2 , where V a <V b , V 2 >V 1 ; In response to the voltage VT at the input terminal of the temperature sensing circuit being at V a With V b The gate opening voltage VGH output by the power management circuit to the display panel is between V 1 With V 2 between;

[0010] The step of inputting a voltage satisfying a preset voltage threshold to the input terminal of the temperature sensing circuit comprises: inputting a voltage greater than or equal to V b voltage.

[0011] Input a voltage greater than or equal to V to the input terminal of the temperature sensing circuit. b The steps of measuring the voltage of the temperature sensing circuit include: short-circuiting the input terminal of the temperature sensing circuit and the VDD of the power management circuit, or inputting a voltage greater than or equal to V to the input terminal of the temperature sensing circuit through a test circuit outside the central control circuit. b voltage.

[0012] The sensing circuit is a temperature sensing circuit, wherein in response to the external temperature sensed by the temperature sensing circuit being lower than the first temperature threshold, the gate opening voltage VGH output by the power management circuit to the display panel is higher than V 1 ;

[0013] The step of making the sensing circuit meet the preset conditions includes: keeping the operating temperature of the display panel at normal temperature, and changing the ambient temperature of the temperature sensing circuit to below the first temperature threshold while keeping the operating temperature of the display panel at normal temperature.

[0014] In order to solve the above technical problems, the second technical solution provided by the present application is: to provide a central control circuit for a display panel, wherein the gate opening voltage VGH of the display panel is V 1 ; The central control circuit includes:

[0015] A power management circuit and a sensing circuit electrically connected to each other, wherein, in response to the sensing circuit meeting a preset condition, the power management circuit outputs a gate opening voltage VGH higher than V 1 ;in,

[0016] It also includes a first connecting terminal and a second connecting terminal that are spaced apart, the first connecting terminal is electrically connected to the power management circuit, the second connecting terminal is electrically connected to the input end of the temperature sensing circuit, and the first connecting terminal and the second connecting terminal are used to short-circuit when detecting the display panel so that the sensing circuit meets preset conditions.

[0017] Wherein, the sensing circuit is a temperature sensing circuit;

[0018] The power management circuit includes a voltage detection module and a gate voltage setting module connected to each other; the voltage detection module is electrically connected to the input end of the temperature sensing circuit and is used to detect the voltage VT of the input end of the temperature sensing circuit; the gate voltage setting module is used to output a voltage higher than V to the display panel in response to the voltage VT of the input end of the temperature sensing circuit meeting a preset voltage threshold. 1 The gate turn-on voltage VGH.

[0019] The temperature sensing circuit includes a thermistor, and the gate voltage setting module is used to: in response to the voltage VT at the input end of the temperature sensing circuit being less than or equal to the first preset voltage V a , output to the display panel is equal to V 1 In response to the voltage VT at the input terminal of the temperature sensing circuit being greater than or equal to the second preset voltage V b , output to the display panel is equal to V 2 The gate opening voltage VGH, where V a <V b , V 2 >V 1 ; In response to the voltage VT at the input terminal of the temperature sensing circuit being at V a With V b The output to the display panel is between V 1 With V 2 The gate turn-on voltage VGH between.

[0020] Wherein, the first connection terminal and the second connection terminal are gold fingers, which are used to short-circuit through the connector when detecting the display panel;

[0021] Or the first connecting terminal and the second connecting terminal are two ends of a switch, and are used to short-circuit by closing the switch when detecting the display panel.

[0022] In order to solve the above technical problems, the third technical solution provided in the present application is: to provide a display device, including a display panel and a central control circuit; wherein the central control circuit is the central control circuit described above.

[0023] Beneficial effects of the present application: Different from the prior art, the present application provides a display panel detection method, a display device and a central control circuit. The display panel detection method includes: electrically connecting the display panel to the central control circuit, wherein the central control circuit includes a power management circuit and a sensing circuit electrically connected to each other, and in response to the sensing circuit meeting a preset condition, the power management circuit outputs a gate opening voltage VGH higher than V 1 ; and make the sensing circuit meet the preset conditions. The present application artificially forces the sensing circuit of the normal central control circuit to meet the preset conditions to perform aging test while keeping the operating temperature of the display panel at room temperature. There is no need for a special test central control circuit, which simplifies the process and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 is a structural schematic diagram of an embodiment of a display device provided by the present application;

[0026] Figure 2 is a structural schematic diagram of an embodiment of a liquid crystal display device provided by the present application;

[0027] Figure 3 is a structural schematic diagram of the first embodiment of the central control circuit provided by the present application;

[0028] Figure 4 is a structural schematic diagram of a second embodiment of a central control circuit provided by the present application;

[0029] Figure 5 is a structural schematic diagram of a third embodiment of a central control circuit provided by the present application;

[0030] Figure 6 It is a schematic diagram of the detection method provided in this application.

[0031] Description of Figure Numbers:

[0032] 300-display device, 100-display panel, 200-central control board, 11-display area, 12 non-display area, 13-array substrate, 14-driving unit, 141 source driving unit, 142 gate driving unit, 15-control circuit board, 20-central control circuit, 21-power management circuit, 211-voltage detection module, 212-gate voltage setting module, 22-sensing circuit, 220-temperature sensing circuit, 23-constant current source, 30-first connecting terminal, 40-second connecting terminal, 50-gold finger, 60-switch. DETAILED DESCRIPTION

[0033] The scheme of the embodiment of the present application is described in detail below in conjunction with the drawings of the specification.

[0034] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] The terms "first", "second", "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the embodiments of this application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the steps or units listed, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] The inventor of the present application has found that when performing aging detection on the display panel, the gate opening voltage (Vgatehigh, VGH) of the array substrate is increased. For example, the VGH of the normal shipped product is 30V, and it must be 36V during the aging test, and then shipped after passing the test. In the prior art, the aging test is usually performed before the normal CB board is bound to the display panel, that is, the test CB (VGH is set to 36V) is used during the aging test, and the normal CB (VGH is set to 30V) is used during shipment. However, for models in which the control circuit board (X board, XB) and CB are bound together for shipment, this method requires first binding the test CB with the XB, then unbinding the test CB from the XB after the test, and finally binding the normal CB with the XB, resulting in a complicated preparation process.

[0039] Therefore, in order to solve the problems in the prior art, the embodiments of the present application provide a display panel detection method, a display device and a central control circuit. The display device provided by the embodiments of the present application is first described in detail below.

[0040] See also Figure 1 , Figure 1 It is a structural schematic diagram of an embodiment of a display device provided in the present application.

[0041] The display device 300 includes a display panel 100 and a central control board 200. The central control board 200 includes a central control circuit 20, and the central control circuit 20 controls the operation of the display panel 100. The display device 300 can be divided into a cathode ray tube (CRT) display device, a liquid crystal display (LCD) display device, a light emitting diode (LED) display device, a 3D display device, etc.

[0042] The display panel 100 has a display area 11 and a non-display area 12 surrounding the display area 11. The display area 11 is used to set structures such as pixels, drive circuits, data signal lines, and scan signal lines. The non-display area 12 is used to set structures such as scan circuits and test circuits.

[0043] In this embodiment, a liquid crystal display device is used as an example for description. Figure 2 , Figure 2It is a structural schematic diagram of an embodiment of a liquid crystal display device provided in the present application.

[0044] The display panel 100 includes an array substrate 13, a driving unit 14 and a control circuit board 15. The driving unit 14 is electrically connected to the array substrate 13 and the control circuit board 15 respectively. The array substrate 13 is used to display images. The driving unit 14 is used to apply voltage to the array substrate 13 to drive the array substrate 13 to display images. The control circuit board 15 is used to transmit data signals and control signals to the driving unit 14. Further, the display panel 100 also includes a color filter substrate (not shown) arranged opposite to the array substrate 13, and a liquid crystal layer (not shown) located between the array substrate 13 and the color filter substrate.

[0045] The array substrate 13 includes a base substrate (not shown), a pixel electrode (not shown), and a polarizing layer (not shown). The base substrate includes a thin film transistor array and wiring. The base substrate can be a glass substrate or a substrate of other materials. Both the top and bottom surfaces of the base substrate have wiring. The array substrate 13 can also include other functional layers, which are not limited here.

[0046] The driving unit 14 may be a chip-on-film. Each driving unit 14 includes a flexible circuit board (not shown) and a driving chip (not shown). The driving chip is electrically connected to the flexible circuit board, and is electrically connected to the wiring of the array substrate 13 and the control circuit board 15 through the flexible circuit board.

[0047] There are multiple driving units 14, and the multiple driving units 14 include multiple source driving units 141 and multiple gate driving units 142. The multiple source driving units 141 determine the data signal voltage value applied to the array substrate 13 based on the data signal transmitted by the received control circuit board 15. The multiple source driving units 141 are arranged on the first side of the array substrate 13 and connected to the array substrate 13 through the substrate wiring. Specifically, the multiple source driving units 141 are arranged at intervals along the lateral extension direction of the array substrate 13.

[0048] The plurality of gate drive units 142 control the switches of the thin film transistors on the array substrate 13 based on the control signals transmitted by the received control circuit board 15. In a specific embodiment, the gate drive unit 142 controls when the gate drive chip outputs based on the received control signal, that is, controls the output timing of the gate drive chip to scan each row of pixels. The plurality of gate drive units 142 are arranged on the second side and / or the third side adjacent to the first side of the array substrate 13, and are electrically connected to the array substrate 13 through the substrate wiring. The second side and the third side are arranged opposite to each other. Specifically, the plurality of gate drive units 142 are arranged at intervals along the vertical extension direction of the array substrate 13.

[0049] The control circuit board 15 may be a printed circuit board. There are multiple control circuit boards 15, and the multiple control circuit boards 15 are electrically connected to the central control board 200 and the driving unit 14 respectively to transmit data signals and control signals sent from the central control board 200 to the driving unit 14.

[0050] The central control board 200 is used to receive input signals from the system end and output data signals to the source driving unit 141 to control the voltage value applied to the array substrate 13 in the display panel 100 through the source driving unit 141; at the same time, it outputs a control signal to the gate driving unit 142 to control when the gate driving chip in the gate driving unit 142 outputs, that is, to control the output timing of the gate driving chip.

[0051] See also Figure 3 , Figure 3 It is a structural diagram of the first embodiment of the central control circuit provided by the present application.

[0052] The central control board 200 includes a central control circuit 20. The central control circuit 20 includes a power management circuit 21, a sensing circuit 22 and a constant current source 23. The power management circuit 21 is electrically connected to the sensing circuit 22. The power management circuit 21 is electrically connected to the driving unit 14, and is used to control the voltage value applied to the array substrate 13 and control the switch of the array substrate 13. The sensing circuit 22 is used to sense environmental factors and then adjust the resistance value of the sensing circuit 22. The constant current source 23 is connected to the input end of the sensing circuit 22 to deliver a constant current to the sensing circuit 22. The constant current source 23 is also electrically connected to the power management circuit 21.

[0053] In one embodiment, the sensing circuit 22 is a temperature sensing circuit 220, and the temperature sensing circuit 220 includes a thermistor R 0 The resistance of the temperature sensing circuit 220 increases with the thermistor R 0 The lower the ambient temperature of the temperature sensing circuit 220, the lower the thermistor R 0 Since the constant current source 23 inputs a constant current to the temperature sensing circuit 220, the voltage VT at the input end of the temperature sensing circuit 220 changes with the thermistor R 0 The lower the temperature, the greater the voltage VT at the input terminal of the temperature sensing circuit 220.

[0054] In one embodiment, the temperature sensing circuit 220 includes a thermistor R 0 and ordinary resistors. There is at least one ordinary resistor. Multiple ordinary resistors and thermistor R 0 Series and / or parallel. Single thermistor R 0 The precision of adjusting the resistor is not high, the thermistor R 0After being connected in series and / or in parallel with a common resistor, the resistance value of the sensing circuit 22 can be adjusted more finely. In a preferred embodiment, the common resistor includes a common resistor R 1 And the ordinary resistor R 2 , thermistor R 0 With ordinary resistor R 1 After connecting in parallel, add a common resistor R in series 2 , ordinary resistor R 1 And the ordinary resistor R 2 The resistance value of is not limited here and is designed according to actual needs. In this embodiment, the sensing circuit 22 is a temperature sensing circuit 220. In other embodiments, the sensing circuit 22 may be a light sensing circuit or a pressure sensing circuit.

[0055] The power management circuit 21 includes a voltage detection module 211 and a gate voltage setting module 212. The voltage detection module 211 is electrically connected to the gate voltage setting module 212, and the voltage detection module 211 is electrically connected to the input end of the sensing circuit 22. The voltage detection module 211 is used to detect the voltage VT at the input end of the sensing circuit 22, and the gate voltage setting module 212 obtains the voltage VT detected by the voltage detection module 211 and outputs the gate opening voltage VGH to the display panel 100. Among them, a preset voltage threshold is set in the gate voltage setting module 212, and the corresponding gate opening voltage VGH is output according to whether the voltage VT obtained by the gate voltage setting module 212 meets the preset voltage threshold. Among them, the preset voltage threshold is V a and V b .

[0056] In one embodiment, in response to the voltage VT at the input terminal of the sensing circuit 22 being less than or equal to the first preset voltage V a , the gate voltage setting module 212 outputs a voltage equal to V 1 The gate opening voltage VGH; the voltage VT at the input terminal of the sensing circuit 22 is greater than or equal to the second preset voltage V b , the gate voltage setting module 212 outputs a voltage equal to V 2 The gate opening voltage VGH, where V a <V b , V 2 >V 1 In response to the voltage VT at the input terminal of the sensing circuit 22 being between Va and Vb, the gate voltage setting module 212 outputs a voltage at V to the display panel 100. 1 With V 2 The voltage VT obtained by the gate voltage setting module 212 satisfies a voltage less than or equal to V aUnder the condition of , the display panel 100 works normally; at room temperature, the voltage VT obtained by the gate voltage setting module 212 is forced to satisfy a value greater than or equal to V b When the condition is met, the display panel 100 can perform aging detection. It should be understood that the detection circuit that changes the output voltage of the gate opening voltage VGH by changing the voltage VT at the input terminal of the sensing circuit 22 is also applicable to other circuits that need to change the gate opening voltage of the display panel 100 for detection.

[0057] In one embodiment, V a is 2V, V b is 3V, V 1 is 30V, V 2 The voltage VT at the input terminal of the sensing circuit 22 is greater than or equal to V b , that is, when the voltage VT is greater than or equal to 3V, the gate voltage setting module 212 outputs a gate opening voltage VGH equal to 36V to the display panel 100, and the aging detection of the display panel 100 can be performed. It should be understood that when performing the aging detection, it is necessary to keep the ambient temperature of the display panel 100 at room temperature, that is, to keep the ambient temperature of the display panel 100 to meet the room temperature condition, so as to force the voltage VT of the input terminal of the sensing circuit 22 to be greater than or equal to 3V. In other embodiments, V a 、V b 、V 1 and V 2 Other preset values ​​can be set according to actual needs.

[0058] In one embodiment, a first temperature threshold is set in the temperature sensing circuit 220. When the ambient temperature of the temperature sensing circuit 220 is equal to the first temperature threshold, the voltage VT at the input terminal of the temperature sensing circuit 220 is less than or equal to V a , V a is 2V, and the gate opening voltage VGH of the display panel 100 is V 1 , V 1 When the ambient temperature of the temperature sensing circuit 220 is lower than the first temperature threshold, the total resistance value of the temperature sensing circuit 220 increases, and the voltage VT at the input terminal of the temperature sensing circuit 220 is greater than V b , V b The gate voltage setting module 212 outputs a gate opening voltage VGH of 36 V to the display panel 100. When performing aging detection, the ambient temperature of the temperature sensing circuit 220 is lower than the first temperature threshold and the ambient temperature of the display panel 100 is kept at a normal temperature. For example, cold wind or ice cubes are used to force the temperature of the surrounding area of ​​the temperature sensing circuit 220 to drop below the first temperature threshold.

[0059] In other optional embodiments, when performing aging detection, a voltage greater than or equal to 3V can be directly input to the input end of the sensing circuit 22 through an external circuit, forcing the voltage VT obtained by the gate voltage setting module 212 to meet the condition of being greater than or equal to 3V, thereby outputting a gate opening voltage VGH equal to 36V to the display panel 100.

[0060] See also Figure 4 , Figure 4 It is a structural diagram of the second embodiment of the central control circuit provided in this application.

[0061] In one embodiment, the central control circuit 20 further includes a first connection terminal 30 and a second connection terminal 40 which are arranged at intervals. The first connection terminal 30 and the second connection terminal 40 are arranged at intervals, the first connection terminal 30 is electrically connected to the power management circuit 21 through a wiring, and the second connection terminal 40 is electrically connected to the input end of the sensing circuit 22 through a wiring. The power management circuit 21 also includes VDD, which is the operating voltage of the thin film transistor on the array substrate 13. In this embodiment, the voltage of VDD is always 3.3V. One end of the first connection terminal 30 connected to the power management circuit 21 is connected to VDD.

[0062] When the display panel 100 works normally, VDD is not connected to the sensing circuit 22 .

[0063] In one embodiment, the first connection terminal 30 and the second connection terminal 40 are gold fingers 50. The gold fingers 50 are arranged at the edge of the central control board 200. When the panel is detected, the first connection terminal 30 and the second connection terminal 40 are short-circuited through the connector on the central control board 200, so that the input end of the sensing circuit 22 and VDD are turned on, and the voltage VT of the input end of the sensing circuit 22 is equal to the voltage of VDD, that is, VT is equal to 3.3V; therefore, the voltage VT of the input end of the sensing circuit 22 is greater than 3V, and the gate voltage setting module 212 outputs a gate opening voltage VGH equal to 36V to the display panel 100, and the display panel 100 can perform aging detection. Since the central control board 200 usually has a connector (not shown) and a spare gold finger 50, this structure does not increase the cost of the central control board 200.

[0064] See also Figure 5 , Figure 5 It is a structural diagram of the third embodiment of the central control circuit provided in this application.

[0065] In one embodiment, the first connection terminal 30 and the second connection terminal 40 are two ends of a switch 60, and the switch 60 is disposed on the central control board 200. When the panel is detected, the switch 60 is closed to conduct the input end of the sensing circuit 22 and VDD, and the voltage VT of the input end of the sensing circuit 22 is the voltage of VDD, that is, VT is equal to 3.3V; therefore, the voltage VT of the input end of the sensing circuit 22 is greater than 3V, and the gate voltage setting module 212 outputs a gate opening voltage VGH equal to 36V to the display panel 100, and the display panel 100 can perform aging detection.

[0066] In other embodiments, a voltage greater than or equal to 3V can be directly input to the input end of the temperature sensing circuit 220 through a test circuit outside the central control circuit 20, so that the voltage VT at the input end of the sensing circuit 22 is greater than or equal to the preset voltage threshold V in the gate voltage setting module 212. b , V b The gate voltage setting module 212 outputs a gate-on voltage of 36V to the display panel 100.

[0067] The display device 300 provided in this embodiment makes the voltage VT of the input end of the sensing circuit 22 in the central control board 200 greater than or equal to 3V when performing aging detection after the central control board 200 is bound to the display panel 100, that is, the voltage VT of the input end of the sensing circuit 22 obtained by the gate voltage setting module 212 satisfies the preset voltage threshold, and then outputs a gate opening voltage VGH of 36V, so that aging detection can be performed without a special test central control circuit, simplifying the process and reducing production costs. In particular, for the centralized shipment after XB and CB are bound, shipment can be made after testing without unbinding, which greatly simplifies the process.

[0068] In combination with the display device 300 having the display panel 100 provided in the above embodiment, this embodiment further provides a detection method of the display panel 100, which is used to perform aging detection on the display panel 100. The detection method includes:

[0069] See also Figure 6 , Figure 6 It is a schematic diagram of the detection method provided in this application.

[0070] S1: The display panel is electrically connected to the central control circuit; the central control circuit includes a power management circuit and a sensing circuit electrically connected to each other, wherein, in response to the sensing circuit meeting a preset condition, the gate opening voltage VGH output by the power management circuit to the display panel is higher than V 1 .

[0071] S2: Make the sensing circuit meet the preset conditions.

[0072] In step S1, the gate opening voltage VGH of the display panel 100 is V 1 , the sensing circuit 22 is a temperature sensing circuit 220, and the power management circuit 21 is used to obtain the voltage VT of the input terminal of the temperature sensing circuit 220, wherein, in response to the voltage VT of the input terminal of the temperature sensing circuit 220 meeting the preset voltage threshold, the gate opening voltage VGH output by the power management circuit 21 to the display panel 100 is higher than V 1 .

[0073] In step S2, the step of making the sensing circuit 22 meet the preset condition includes: inputting a voltage that meets the preset voltage threshold to the input terminal of the temperature sensing circuit 220. It can be understood that in this step, the ambient temperature of the display panel 100 needs to be kept at a normal temperature condition, that is, the display panel 100 works at normal temperature.

[0074] In a specific embodiment, the temperature sensing circuit 220 includes a thermistor R0. In response to a voltage VT at an input terminal of the temperature sensing circuit 220 being less than or equal to V a , the gate opening voltage VGH output by the power management circuit 21 to the display panel 100 is V 1 In response to the voltage VT at the input terminal of the temperature sensing circuit 220 being greater than or equal to V b , the gate opening voltage VGH output by the power management circuit 21 to the display panel 100 is V 2 , and V 2 >V 1 In response to the voltage VT at the input terminal of the temperature sensing circuit 220 being at V a With V b The gate opening voltage VGH output by the power management circuit 21 to the display panel 100 is between V 1 With V 2 between.

[0075] The step of inputting a voltage satisfying a preset voltage threshold to the input terminal of the temperature sensing circuit 220 includes: inputting a voltage greater than or equal to V b voltage.

[0076] In one embodiment, V a is 2V, V b is 3V, V 1 is 30V, V 2 It is 36V.

[0077] The input terminal of the temperature sensing circuit 220 is input with a voltage greater than or equal to V bThe step of measuring the voltage includes: short-circuiting the input terminal of the temperature sensing circuit 220 and the VDD of the power management circuit 21, or inputting a voltage greater than or equal to 3V to the input terminal of the temperature sensing circuit 220 through a test circuit outside the central control circuit 20.

[0078] In one embodiment, the sensing circuit 22 is a temperature sensing circuit 220, wherein in response to the external temperature sensed by the temperature sensing circuit 220 being lower than the first temperature threshold, the gate opening voltage VGH output by the power management circuit 21 to the display panel 100 is higher than V 1 ;

[0079] The step of making the sensing circuit 22 meet the preset condition includes: changing the ambient temperature of the temperature sensing circuit 220 to be lower than the first temperature threshold and maintaining the ambient temperature of the display panel 100 at a normal temperature. It can be understood that if the ambient temperature of the temperature sensing circuit 220 is lower than the first temperature threshold due to the ambient temperature of the display panel 100 being lower than the first temperature threshold requiring temperature compensation, then the aging test cannot be performed on the display panel 100.

[0080] The display panel detection method provided in this embodiment, wherein the gate opening voltage VGH of the display panel is V 1 , including: electrically connecting the display panel to the central control circuit; the central control circuit includes a power management circuit and a temperature sensing circuit electrically connected to each other, wherein, in response to the temperature sensing circuit meeting a preset condition, the power management circuit will output a gate opening voltage VGH higher than V 1 The present application maintains the operating temperature of the display panel at room temperature by artificially forcing the temperature sensing circuit of the normal central control circuit to meet preset conditions for aging testing, without the need for a dedicated test central control circuit, thus simplifying the process and reducing production costs.

[0081] The above are only implementation methods of the present application, and are not intended to limit the patent protection scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for detecting a display panel, wherein: The gate opening voltage VGH of the display panel is V1, and the characteristics include: The display panel is electrically connected to a central control circuit; the central control circuit includes a power management circuit and a sensing circuit electrically connected to each other, wherein, in response to the sensing circuit meeting a preset condition, the gate opening voltage VGH output by the power management circuit to the display panel is higher than V1; Making the sensing circuit meet the preset condition; The preset conditions include: Under the condition that the operating temperature of the display panel is kept at normal temperature, a voltage satisfying a preset voltage threshold is input to the input end of the sensing circuit; or, Under the condition that the operating temperature of the display panel is kept at normal temperature, the ambient temperature of the sensing circuit is changed to be lower than a first temperature threshold.

2. The display panel detection method according to claim 1, characterized in that: The sensing circuit is a temperature sensing circuit, and the power management circuit is used to obtain a voltage VT at an input terminal of the temperature sensing circuit, wherein in response to the voltage VT at the input terminal of the temperature sensing circuit meeting the preset voltage threshold, the gate opening voltage VGH output by the power management circuit to the display panel is higher than V1; The step of making the sensing circuit meet the preset condition includes: inputting a voltage that meets the preset voltage threshold to the input end of the temperature sensing circuit under the condition that the operating temperature of the display panel is kept at a normal temperature.

3. The display panel detection method according to claim 2, characterized in that: The temperature sensing circuit includes a thermistor, in response to a voltage VT at an input end of the temperature sensing circuit being less than or equal to a first preset voltage V a , the gate opening voltage VGH output by the power management circuit to the display panel is V1; in response to the voltage VT at the input end of the temperature sensing circuit being greater than or equal to the second preset voltage V b , the gate opening voltage VGH output by the power management circuit to the display panel is V2, where V a <V b , V2>V1; in response to the voltage VT at the input terminal of the temperature sensing circuit being at V a With V b The gate opening voltage VGH output by the power management circuit to the display panel is between V1 and V2; The step of inputting a voltage satisfying the preset voltage threshold to the input terminal of the temperature sensing circuit comprises: inputting a voltage greater than or equal to V b voltage.

4. The display panel detection method according to claim 3, characterized in that: The input terminal of the temperature sensing circuit is input with a voltage greater than or equal to V b The step of measuring the voltage of the temperature sensing circuit comprises: short-circuiting the input terminal of the temperature sensing circuit and the VDD of the power management circuit, or inputting a voltage greater than or equal to V to the input terminal of the temperature sensing circuit through a test circuit other than the central control circuit. b voltage.

5. The display panel detection method according to claim 1, characterized in that: The sensing circuit is a temperature sensing circuit, wherein, in response to the external temperature sensed by the temperature sensing circuit being lower than the first temperature threshold, the gate opening voltage VGH output by the power management circuit to the display panel is higher than V1; The step of making the sensing circuit meet the preset condition includes: changing the ambient temperature of the temperature sensing circuit to be lower than the first temperature threshold while keeping the operating temperature of the display panel at a normal temperature.

6. A central control circuit for a display panel, wherein: The gate opening voltage VGH of the display panel is V1; The central control circuit comprises: A power management circuit and a sensing circuit electrically connected to each other, wherein, in response to the sensing circuit meeting a preset condition, the gate opening voltage VGH output by the power management circuit to the display panel is higher than V1; The device is characterized in that it further comprises a first connection terminal and a second connection terminal which are arranged at intervals, the first connection terminal is electrically connected to the power management circuit, the second connection terminal is electrically connected to the input end of the sensing circuit, and the first connection terminal and the second connection terminal are used to short-circuit when detecting the display panel, so that the sensing circuit meets the preset condition; The preset conditions include: Under the condition that the operating temperature of the display panel is kept at normal temperature, a voltage satisfying a preset voltage threshold is input to the input end of the sensing circuit; or, Under the condition that the operating temperature of the display panel is kept at normal temperature, the ambient temperature of the sensing circuit is changed to be lower than a first temperature threshold.

7. The central control circuit according to claim 6, characterized in that: The sensing circuit is a temperature sensing circuit; The power management circuit includes a voltage detection module and a gate voltage setting module which are interconnected; the voltage detection module is electrically connected to the input end of the temperature sensing circuit and is used to detect the voltage VT at the input end of the temperature sensing circuit; the gate voltage setting module is used to output a gate opening voltage VGH higher than V1 to the display panel in response to the voltage VT at the input end of the temperature sensing circuit satisfying a preset voltage threshold.

8. The central control circuit according to claim 7, characterized in that: The temperature sensing circuit includes a thermistor, The gate voltage setting module is used to: respond to the voltage VT of the input terminal of the temperature sensing circuit being less than or equal to the first preset voltage V a , outputting a gate opening voltage VGH equal to V1 to the display panel; in response to the voltage VT at the input end of the temperature sensing circuit being greater than or equal to the second preset voltage V b , outputs a gate opening voltage VGH equal to V2 to the display panel, where V a <V b , V2>V1; in response to the voltage VT at the input terminal of the temperature sensing circuit being at V a With V b A gate-on voltage VGH between V1 and V2 is output to the display panel.

9. The central control circuit according to claim 6, characterized in that: The first connection terminal and the second connection terminal are gold fingers, which are used to short-circuit through a connector when detecting the display panel; Or the first connecting terminal and the second connecting terminal are two ends of a switch, and are used to short-circuit by closing the switch when detecting the display panel.

10. A display device, comprising a display panel and a central control circuit; characterized in that: The central control circuit is the central control circuit described in any one of claims 6-9.

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