CN114038365B

CN114038365B - Display panel detection method, device, equipment and storage medium

Info

Publication number: CN114038365B
Application number: CN202111433353.7A
Authority: CN
Inventors: 叶纯; 杨钰婷; 汪中尚; 杨茜; 李光辉; 雷金波
Original assignee: Nanjing Boe Display Technology Co ltd; BOE Technology Group Co Ltd
Current assignee: Nanjing Boe Display Technology Co ltd; BOE Technology Group Co Ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2023-12-26
Anticipated expiration: 2041-11-29
Also published as: CN114038365A

Abstract

The embodiment of the application provides a detection method, device and equipment of a display panel and a storage medium. The detection method sequentially comprises a picture driving mode and a turn-off driving mode; the off driving mode includes: stopping sending the picture enable signal and the data signal to the pixel circuit in the display panel; transmitting a first control signal and a first driving signal to a pixel driving circuit in a display panel; the first control signal is used for controlling the pixel driving circuit to transmit the first driving signal to the pixel circuit so as to control the pixel circuit to be in a conducting state; the falling edge of the first control signal is later than the falling edge of the first driving signal. In the detection turn-off driving mode, the time that the pixel driving circuit and the pixel circuit are in the on state is prolonged respectively, so that residual charges in the display panel are released outwards, the liquid crystal polarization phenomenon caused by charge residues is reduced, the interference of the charge residues on judging detection results is reduced, and the detection accuracy is improved.

Description

Display panel detection method, device, equipment and storage medium

Technical Field

The present application relates to the field of display technologies, and in particular, to a method, an apparatus, a device, and a storage medium for detecting a display panel.

Background

The oxide material is suitable for manufacturing high-end TFT (Thin Film Transistor ) -LCD (Liquid Crystal Display, liquid crystal display) products due to the characteristics of high electron mobility, low leakage current and the like, and has advantages in small-size narrow-frame products.

However, due to the strict and inherent TFT characteristics of the oxide material, in the process of developing small-sized products, particularly small-sized products, the defect phenomenon of visible similar group glow points under a detection screen easily occurs during detection, thereby influencing the screen quality of the products and reducing the yield of the products.

Although group glow defects are detected in the electric signal waveform of the inspection screen, these screens are displayed normally in other normal screens, and the RA (Reliability) test result is also normal. Therefore, the existing detection method for the LCD product using the oxide material is easy to cause overdetermination of the detection result, resulting in sacrifice of the product yield.

Disclosure of Invention

Aiming at the defects of the existing mode, the application provides a detection method, a device, equipment and a storage medium of a display panel, which are used for solving the technical problem that the detection method for an LCD product adopting an oxide material is easy to cause overdetermination of a detection result in the prior art.

In a first aspect, an embodiment of the present application provides a method for detecting a display panel, including a picture driving mode and a shutdown driving mode in order; the off driving mode includes:

stopping sending the picture enable signal and the data signal to the pixel circuit in the display panel;

transmitting a first control signal and a first driving signal to a pixel driving circuit in a display panel; the first control signal is used for controlling the pixel driving circuit to transmit the first driving signal to the pixel circuit so as to control the pixel circuit to be in a conducting state; the falling edge of the first control signal is later than the falling edge of the first driving signal.

In one embodiment, the slope of the falling edge of the first control signal is less than the slope of the falling edge of the first drive signal.

In one embodiment, the off-driving mode further includes: after the falling edge interval of the first control signal sets a period, a second control signal is sent to the pixel driving circuit in the display panel to control the pixel driving circuit to be in a conductive state.

In one embodiment, the sustain time of the first drive signal is not less than a first set duration, the first set duration is not less than 10 microseconds and not more than 500 microseconds.

In one embodiment, the sustain time of the first control signal is longer than the sustain time of the first driving signal by a second set period of time, and the second set period of time is not less than 500 microseconds.

In one embodiment, the sustain time of the second control signal is not less than a third set duration, which is not less than 4 pulse widths.

In one embodiment, the first drive signal comprises: at least one of a clock control signal, a pull-down sustain-off signal, and an enable signal of a pull-down sustain unit.

In one embodiment, the off-driving mode further includes: and sending a grounding control signal to a discharger electrically connected with the display panel to control the discharger to be conducted and grounded.

In one embodiment, the picture driving mode sequentially includes: a first driving mode and a second driving mode;

the first driving mode includes: transmitting a first picture enable signal and a first data signal to a pixel circuit in a display panel; transmitting a third control signal and a second drive signal to a pixel drive circuit in the display panel; the third control signal is used for controlling the pixel driving circuit to transmit the second driving signal to the pixel circuit so as to control the pixel circuit to display the first picture according to the first picture enabling signal and the first data signal;

the second driving mode includes: transmitting a second picture enable signal and a second data signal to a pixel circuit in the display panel; transmitting a third control signal and a second drive signal to a pixel drive circuit in the display panel; the third control signal is used for controlling the pixel driving circuit to transmit the second driving signal to the pixel circuit so as to control the pixel circuit to display a second picture according to the second picture enabling signal and the second data signal;

wherein at least part of the first data signal and the second data signal are in opposite phase.

In a second aspect, an embodiment of the present application provides a detection apparatus for a display panel, including:

a picture enabling module for stopping transmission of a picture enabling signal to a pixel circuit in the display panel in the off driving mode;

a pixel driving module for transmitting a first control signal and a first driving signal to a pixel driving circuit in the display panel in an off driving mode; the first control signal is used for controlling the pixel driving circuit to transmit the first driving signal to the pixel circuit so as to control the pixel circuit to be in a conducting state; the falling edge of the first control signal is later than the falling edge of the first driving signal.

In a third aspect, embodiments of the present application provide a detection apparatus, including:

a processor electrically connected to the pixel circuits and the pixel driving circuits of the display panel, respectively;

and a memory electrically coupled to the processor and configured to store machine-readable instructions that, when executed by the processor, implement a method of detecting a display panel as set forth in the first aspect.

In one embodiment, the detection device further comprises: a discharger electrically connected with the processor;

the discharger is used for respectively grounding the pixel circuit and the pixel driving circuit of the display panel under the control of the processor.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium storing computer instructions that, when executed on a computer, implement a method for detecting a display panel as set forth in the first aspect.

The beneficial technical effects that technical scheme that this application embodiment provided brought include: in the detected turn-off driving mode, the time that the pixel driving circuit and the pixel circuit are in the on state is prolonged respectively, so that residual charges in the pixel driving circuit and the pixel circuit of the display panel are released outwards, the liquid crystal polarization phenomenon caused by charge residues is reduced, the interference of the charge residues on judging detection results is reduced, and the detection accuracy is improved.

The falling edge of the first control signal is later than the falling edge of the first driving signal, so that the pixel driving circuit can drive the pixel circuit to keep a conducting state before the pixel circuit fully releases residual charges, and the residual charges in the pixel driving circuit and the pixel circuit can be fully released.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic diagram of a structural frame of an electrical connection between a detection device and a display panel according to an embodiment of the present application;

FIG. 2 is a schematic structural frame diagram of another detecting device according to an embodiment of the present application;

fig. 3 is a flow chart of a method for detecting a display panel according to an embodiment of the present application;

fig. 4 is a flowchart of another method for detecting a display panel according to an embodiment of the present disclosure;

fig. 5 is a schematic structural frame diagram of a detection device according to an embodiment of the present application;

fig. 6 is a timing chart of a specific method for detecting a display panel according to an embodiment of the present application.

In the figure:

100-detecting equipment; 110-a processor; 120-memory; 130-discharger; 140-buses; 150-a transceiver; 160-an input unit; 170-an output unit;

200-detecting device; 210-a picture enabling module; 220-a pixel driving module; 230-a ground drive module;

300-a display panel; 310-pixel circuits; 320-pixel drive circuit.

Detailed Description

Examples of embodiments of the present application are illustrated in the accompanying drawings, in which like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. Further, if detailed description of the known technology is not necessary for the illustrated features of the present application, it will be omitted. The embodiments described below by referring to the drawings are exemplary only for the purpose of illustrating the present application and are not to be construed as limiting the present application.

It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.

Several terms which are referred to in this application are first introduced and explained:

and a pixel circuit: and a circuit for driving the display device to operate and displaying a display picture.

A pixel driving circuit: and a circuit for driving the pixel circuit to be turned on or off.

Picture enable signal and data signal: and the signal is used for driving the display device to display a display picture.

Control signal: a signal for driving the pixel driving circuit to be turned on or off.

Drive signal: and a signal for driving the pixel circuit to be turned on or off.

Ground control signal: and a signal for driving the discharger to open and close.

The inventors of the present application have studied and found that an oxide material has characteristics such as high electron mobility and low leakage current, and also has characteristics that are not stable enough, and charge residues are liable to be caused. Particularly, in the small-sized LCD products using oxide materials, static electricity is more easily introduced, and static electricity residues cause polarization of liquid crystals, so that false defects similar to group glow points are visible due to the static electricity residues in the detection process, the occurrence rate of the false defects is high, the excessive judgment on conventional defects is directly influenced, and the product yield is sacrificed. It is therefore necessary to reduce or even eliminate static electricity after detecting a picture using the origin lamp.

The application provides a detection method, a detection device, detection equipment and a storage medium for a display panel, and aims to solve the technical problems in the prior art.

The following describes the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems in detail with specific embodiments.

The embodiment of the application provides a detection device 100 of a display panel, and a schematic structural diagram of the detection device 100 is shown in fig. 1, including: a processor 110 and a memory 120.

The processor 110 is electrically connected to the pixel circuit 310 and the pixel driving circuit 320 of the display panel 300, respectively;

the memory 120 is electrically connected to the processor 110 and configured to store machine readable instructions that, when executed by the processor 110, implement any of the methods of detecting the display panel 300 as described below. The detection method will be described in detail below and will not be described in detail here.

In this embodiment, the processor 110 may respectively transmit related signals to the pixel circuit 310 and the pixel driving circuit 320 of the display panel 300 to implement a picture driving mode and an off driving mode in a detection state.

In the detected off driving mode, the time that the pixel driving circuit 320 and the pixel circuit 310 are in the on state is respectively prolonged, so that residual charges in the pixel driving circuit 320 and the pixel circuit 310 included in the display panel 300 are released outwards, the polarization phenomenon of liquid crystal caused by charge residues is reduced, the interference of the charge residues on the determination detection result is reduced, and the detection accuracy is improved.

Also, the falling edge of the first control signal is later than the falling edge of the first driving signal, which may facilitate that the pixel driving circuit 320 can drive the pixel circuit 310 to maintain the on state before the pixel circuit 310 sufficiently discharges the residual charge, so that the residual charge including in the pixel driving circuit 320 and in the pixel circuit 310 can be sufficiently discharged.

In some possible embodiments, the detection device 100 further comprises: a discharger 130 electrically connected to the processor 110; the discharger 130 is used to respectively ground the pixel circuit 310 and the pixel driving circuit 320 of the display panel 300 under the control of the processor 110.

In an alternative embodiment, the present application provides a detection apparatus 100, as shown in fig. 2, the detection apparatus 100 includes: a processor 110 and a memory 120. Wherein the processor 110 and the memory 120 are electrically coupled, such as via a bus 140.

The processor 110 may be a CPU (Central Processing Unit ), general purpose processor, DSP (Digital Signal Processor, data signal processor), ASIC (Application Specific Integrated Circuit ), FPGA (Field-Programmable Gate Array, field programmable gate array) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules, and circuits described in connection with this disclosure. The processor 110 may also be a combination that performs computing functions, such as including one or more microprocessors, a combination of a DSP and a microprocessor, or the like.

Bus 140 may include a path that communicates information between the components. Bus 140 may be a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus or an EISA (Extended Industry Standard Architecture ) bus, among others. The bus 140 may be classified into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 2, but not only one bus or one type of bus.

Memory 120 may be, but is not limited to, ROM (Read-Only Memory) or other type of static storage device that can store static information and instructions, RAM (random accessmemory ) or other type of dynamic storage device that can store information and instructions, EEPROM (Electrically Erasable Programmable Read OnlyMemory, electrically erasable programmable Read-Only Memory), CD-ROM (Compact Disc Read-Only Memory) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

Optionally, the detection device may also include a transceiver 150. The transceiver 150 may be used for the reception and transmission of signals. Transceiver 150 may allow the detecting device to communicate wirelessly or by wire with other devices to exchange data. It should be noted that, in practical application, the transceiver 150 is not limited to one.

Optionally, the detection device may further comprise an input unit 160. The input unit 160 may be used to receive input digital, character, image and/or sound information or to generate key signal inputs related to user settings of the detection device and function control. The input unit 160 may include, but is not limited to, one or more of a touch screen, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a track ball, a mouse, a joystick, a camera, a microphone, etc.

Optionally, the detection device may further comprise an output unit 170. The output unit 170 may be used to output or present information processed by the processor 110. The output unit 170 may include, but is not limited to, one or more of a display device, a speaker, a vibration device, and the like.

Optionally, the memory 120 is used for storing application program codes for executing the embodiments of the present application, and the execution is controlled by the processor 110. The processor 110 is configured to execute application program codes stored in the memory 120 to implement any of the detection methods for display panels provided in the embodiments of the present application.

Those skilled in the art will appreciate that the detection apparatus provided by the foregoing embodiments of the present application may be specially designed and manufactured for the required purposes, or may comprise known devices in a general purpose computer. These devices have computer programs stored therein that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., computer) readable medium or in any type of medium suitable for storing electronic instructions and coupled to a bus, respectively.

Based on the same inventive concept, the embodiment of the application provides a detection method of a display panel, which sequentially comprises a picture driving mode and a turn-off driving mode. The schematic flow chart of the off driving mode in the detection method is shown in fig. 3, and the method comprises the following steps S101-S102:

s101: the transmission of the picture enable signal and the data signal to the pixel circuits in the display panel is stopped.

S102: transmitting a first control signal and a first driving signal to a pixel driving circuit in a display panel; the first control signal is used for controlling the pixel driving circuit to transmit the first driving signal to the pixel circuit so as to control the pixel circuit to be in a conducting state; the falling edge of the first control signal is later than the falling edge of the first driving signal.

In this embodiment, through steps S101 and S102, the time that the pixel driving circuit and the pixel circuit are in the on state is prolonged, so that the residual charges in the pixel driving circuit and the pixel circuit of the display panel are released outwards, the polarization phenomenon of the liquid crystal caused by the residual charges is reduced, the interference of the residual charges on the determination detection result is reduced, and the detection accuracy is improved.

Based on the same inventive concept, the embodiment of the present application provides another method for detecting a display panel, in which a schematic flow chart of a turn-off driving mode is shown in fig. 4, and the method includes the following steps S201 to S204:

s201: the transmission of the picture enable signal and the data signal to the pixel circuits in the display panel is stopped.

In this step S201, the transmission of the picture enable signal and the data signal to the pixel circuit in the display panel may be stopped by the processor in the detection device to stop the output of the main power supply to the display panel.

S202: transmitting a first control signal and a first driving signal to a pixel driving circuit in a display panel; the first control signal is used for controlling the pixel driving circuit to transmit the first driving signal to the pixel circuit so as to control the pixel circuit to be in a conducting state; the falling edge of the first control signal is later than the falling edge of the first driving signal.

In this step S202, the release of the residual charge in the off-drive mode may be achieved by the processor in the detection device sending the first control signal and the first drive signal to the pixel drive circuit in the display panel.

In some possible embodiments, the slope of the falling edge of the first control signal is smaller than the slope of the falling edge of the first drive signal. To facilitate that the pixel driving circuit can drive the pixel circuit to remain in an on state before the pixel circuit sufficiently discharges the residual charge, so that the residual charge in the pixel driving circuit and in the pixel circuit can be sufficiently discharged.

In some possible embodiments, the first driving signal has a duration of not less than a first set duration, where the first set duration is not less than 10 microseconds and not more than 500 microseconds, so as to ensure that the pixel circuit has a sufficient on-time to sufficiently release the residual charges in the pixel circuit.

In some possible embodiments, the first control signal has a second set duration longer than the first control signal, where the second set duration is not less than 500 microseconds, so as to facilitate ensuring that the pixel driving circuit remains in the on state for a sufficient time after the pixel circuit sufficiently discharges the residual charge, and further sufficiently discharges the residual charge in the pixel driving circuit.

In some possible embodiments, the first drive signal comprises: at least one of a clock control signal, a pull-down sustain-off signal, and an enable signal of a pull-down sustain unit.

It will be appreciated that the first drive signal may also include other signals that may be used to drive the pixel circuits on and off, depending on the particular model of pixel drive circuit selected.

S203: after the falling edge interval of the first control signal sets a period, a second control signal is sent to the pixel driving circuit in the display panel to control the pixel driving circuit to be in a conductive state.

In this step S203, after the falling edge interval of the first control signal is set for a period, a second control signal may be sent to the pixel driving circuit in the display panel by the processor in the detection device to control the pixel driving circuit to be in an on state. Therefore, the pixel driving circuit can be controlled to realize compensation conduction, so that possible residual charges of all nodes in the pixel driving circuit can be fully released.

In some possible embodiments, the second control signal is maintained for a period of time greater than a third set period of time, which is not less than 4H microseconds, where H is a unit of control signal on-width (pulse width). The maintenance time of the second control signal is 4H microseconds, so that the electric charges possibly remained in each node in the pixel driving circuit can be fully released, and excessive time is not required, so that the whole detection efficiency is improved.

In one example, 1H may be made 6 microseconds, and the aforementioned 4H microseconds is 24 microseconds.

S204: and sending a grounding control signal to a discharger electrically connected with the display panel to control the discharger to be conducted and grounded.

In step S204, a processor in the detection device may send a ground control signal to a discharger electrically connected to the display panel, so as to control the discharger to be turned on and grounded, thereby facilitating outward release of residual charges in the pixel circuit and the pixel driving circuit of the display panel, reducing polarization of liquid crystal caused by the charges, reducing interference of the charges on the determination detection result, and improving detection accuracy.

Based on the detection method of any one of the display panels provided in the foregoing embodiments of the present application, in some possible implementations, the screen driving mode sequentially includes: a first drive mode and a second drive mode.

The first driving mode includes: transmitting a first picture enable signal and a first data signal to a pixel circuit in a display panel; transmitting a third control signal and a second drive signal to a pixel drive circuit in the display panel; the third control signal is used for controlling the pixel driving circuit to transmit the second driving signal to the pixel circuit so as to control the pixel circuit to display a first picture according to the first picture enabling signal and the first data signal;

wherein at least a portion of the first data signal is in phase opposition to the second data signal.

In this embodiment, the first driving mode and the second driving mode in the frame driving mode are respectively used for driving the display panel to perform frame detection, where at least part of phases of the first data signal and the second data signal are opposite, which is beneficial to reducing the polarization probability or the polarized degree of the liquid crystal molecules in the frame detection stage, and also reducing the polarization phenomenon of the liquid crystal caused by the residual charges, so as to reduce the interference of the residual charges on the determination detection result and improve the detection accuracy.

Based on the same inventive concept, an embodiment of the present application provides a detection apparatus 200 for a display panel, where a schematic structural frame of the detection apparatus 200 is shown in fig. 5, and includes: a picture enable module 210 and a pixel drive module 220.

The picture enable module 210 is configured to stop transmitting the picture enable signal and the data signal to the pixel circuit in the display panel in the off driving mode.

The pixel driving module 220 is configured to send a first control signal and a first driving signal to a pixel driving circuit in the display panel in an off driving mode; the first control signal is used for controlling the pixel driving circuit to transmit the first driving signal to the pixel circuit so as to control the pixel circuit to be in a conducting state; the falling edge of the first control signal is later than the falling edge of the first driving signal.

The detection device 200 for a display panel of the present embodiment may perform any of the detection methods for a display panel provided in the foregoing embodiments of the present application, and the implementation principle is similar, and will not be repeated here.

In some possible embodiments, the pixel driving module 220 is configured to send, in the off driving mode, after a falling edge interval of the first control signal sets a period, a second control signal to the pixel driving circuit in the display panel to control the pixel driving circuit to be in an on state.

In some possible embodiments, the detection device 200 further comprises: the ground drive module 230. The ground driving module 230 is used to transmit a ground control signal to the discharger electrically connected to the display panel in the off driving mode to control the discharger to be turned on and grounded.

In some possible implementations, the picture enable module 210 is further configured to send, in a first driving mode of the picture driving mode, a first picture enable signal and a first data signal to the pixel circuits in the display panel; transmitting a third control signal and a second drive signal to a pixel drive circuit in the display panel; the third control signal is used for controlling the pixel driving circuit to transmit the second driving signal to the pixel circuit so as to control the pixel circuit to display the first picture according to the first picture enabling signal and the first data signal.

In some possible implementations, the picture enable module 210 is further configured to send a second picture enable signal and a second data signal to the pixel circuits in the display panel in a second driving mode of the picture driving mode; transmitting a third control signal and a second drive signal to a pixel drive circuit in the display panel; the third control signal is used for controlling the pixel driving circuit to transmit the second driving signal to the pixel circuit so as to control the pixel circuit to display the second picture according to the second picture enabling signal and the second data signal. Wherein at least part of the first data signal and the second data signal are in opposite phase.

Based on the same inventive concept, embodiments of the present application provide a computer-readable storage medium for storing computer instructions that, when executed on a computer, implement a method for detecting any one of the display panels provided in the foregoing embodiments.

The embodiments of the present application provide various alternative embodiments of a computer readable storage medium suitable for use in any of the above methods for detecting a display panel. And will not be described in detail herein.

The technical solution described above in the present application will be described below with reference to a specific embodiment.

As shown in fig. 6, the detection method of the display panel includes: the first driving mode, the second driving mode, the off driving mode and the like. Wherein:

SW: is a switch switching signal, i.e., the ground control signal of the discharger, and Vsh is indicated as a high potential, typically about 30V (volts).

STV: the start enable signal of one frame, that is, the picture enable signal, vgh is indicated as a high potential, and is generally about 20 to 30V.

CK: the respective clock control signals Vgh of the pixel driving circuit (e.g., GOA circuit) section are expressed as high potential (generally about 20 to 30V).

TRST: the reset enable signal of one frame, i.e., the first control signal and the second control signal, vgh is represented as a high potential, typically about 20 to 30V.

VGL/LVGL: the pull-down maintaining off signal of the GOA circuit can be used as a driving signal of the pixel circuit; vgh is represented as a high potential, typically about 20 to 30V); vgm is denoted as a mid-potential, and the threshold voltage Vth for the clamping TFT is typically about 5V; vgl is represented as a low potential, typically about-10V.

VDDO/VDDE: the enable signals of the pull-down sustain units of one frame are generally alternately used, and Vgh, which can be a driving signal of the pixel circuit, is expressed as a high potential, and is generally about 20 to 30V.

VCOM: the common voltage signal displayed by the pixels in the panel is typically about 0V.

R/G/B: data signals displayed by pixels in the panel; vdh is high, typically about 0 to 10V); vdl is expressed as a low potential, and is generally about-10 to 0V.

The key signal hold time for each stage may be:

t1 > a fourth set period of time, the fourth set period of time being not more than 500 μs (microseconds);

t2> a fifth set period of time, which is not less than 100 μs and not more than 1000 μs;

t1 is more than t3 and less than t1+ for a fourth set time period;

t2 < t4< t2+ a fourth set period;

t5> a first set period of time, the first set period of time being not less than 10 μs and not more than 500 μs;

t6> t5+ a second set period of time, the second set period of time being not less than 500 μs;

t7 is TRST time, node charges in the GOA region are cleared, and t7 is longer than a third set time, wherein the third set time is more than or equal to 4Hμs. Wherein, the power down slope of TRST is slower than CK or VGL/LVGL.

By applying the embodiment of the application, at least the following beneficial effects can be realized:

1. in the detected turn-off driving mode, the time that the pixel driving circuit and the pixel circuit are in the on state is prolonged respectively, so that residual charges in the pixel driving circuit and the pixel circuit of the display panel are released outwards, the liquid crystal polarization phenomenon caused by charge residues is reduced, the interference of the charge residues on judging detection results is reduced, and the detection accuracy is improved.

2. The falling edge of the first control signal is later than the falling edge of the first drive signal, which can facilitate that the pixel drive circuit can drive the pixel circuit to maintain the on state before the pixel circuit sufficiently releases the residual charge, so that the residual charge in the pixel drive circuit and the pixel circuit can be sufficiently released.

3. The slope of the falling edge of the first control signal is smaller than the slope of the falling edge of the first drive signal. To facilitate that the pixel driving circuit can drive the pixel circuit to remain in an on state before the pixel circuit sufficiently discharges the residual charge, so that the residual charge in the pixel driving circuit and in the pixel circuit can be sufficiently discharged.

4. The maintaining time of the first driving signal is not less than the first set time length, so that the pixel circuit is guaranteed to have enough conduction time, and residual charges in the pixel circuit are fully released.

5. The first control signal has a second set duration longer than the first control signal, so that the pixel driving circuit is guaranteed to remain in a conducting state for a sufficient time after the pixel circuit fully releases residual charges, and the residual charges in the pixel driving circuit are fully released.

6. After the falling edge interval of the first control signal sets a period, a second control signal is sent to the pixel driving circuit in the display panel to control the pixel driving circuit to be in a conducting state, so that the pixel driving circuit can be controlled to realize compensation conduction, and possible residual charges of all nodes in the pixel driving circuit can be fully released.

7. The maintenance time of the second control signal is not less than 4H microseconds, so that the electric charges possibly remained in each node in the pixel driving circuit can be fully released, and excessive time is not required to be occupied, thereby being beneficial to improving the whole detection efficiency.

8. And a grounding control signal is sent to the discharger electrically connected with the display panel so as to control the discharger to be conducted and grounded, thereby being beneficial to outwards releasing residual charges in the pixel circuit and the pixel driving circuit of the display panel and reducing the liquid crystal polarization phenomenon caused by the charge residues, and further reducing the interference of the charge residues on the judgment detection result and improving the detection accuracy.

9. In the picture driving mode, the first driving mode and the second driving mode are respectively used for driving the display panel to carry out picture detection, wherein at least partial phases of the first data signal and the second data signal are opposite, so that the probability of polarization or the degree of polarization of liquid crystal molecules in the picture detection stage is reduced, the liquid crystal polarization phenomenon caused by charge residues can be reduced, the interference of the charge residues on the judging detection result is reduced, and the detection accuracy is improved.

Those of skill in the art will appreciate that the various operations, methods, steps in the flow, actions, schemes, and alternatives discussed in the present application may be alternated, altered, combined, or eliminated. Further, other steps, means, or steps in a process having various operations, methods, or procedures discussed in this application may be alternated, altered, rearranged, split, combined, or eliminated. Further, steps, measures, schemes in the prior art with various operations, methods, flows disclosed in the present application may also be alternated, altered, rearranged, decomposed, combined, or deleted.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.

It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.

The foregoing is only a partial embodiment of the present application, and it should be noted that, for a person skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A detection method of display panel, characterized by that, include picture drive mode and turn-off drive mode sequentially; the off-driving mode includes:

transmitting a first control signal and a first driving signal to a pixel driving circuit in the display panel; the first control signal is used for controlling the pixel driving circuit to transmit the first driving signal to the pixel circuit so as to control the pixel circuit to be in a conducting state; the falling edge of the first control signal is later than the falling edge of the first driving signal;

the off-driving mode further includes:

and after the falling edge interval of the first control signal is set for a period, sending a second control signal to a pixel driving circuit in the display panel so as to control the pixel driving circuit to be in a conducting state.

2. The detection method according to claim 1, wherein a gradient of a falling edge of the first control signal is smaller than a gradient of a falling edge of the first drive signal.

3. The detection method according to claim 1, wherein a sustain time of the first drive signal is not less than a first set period of time, the first set period of time being not less than 10 microseconds and not more than 500 microseconds;

and/or, the sustain time of the first control signal is longer than the sustain time of the first driving signal by a second set time length, and the second set time length is not less than 500 microseconds;

and/or the maintaining time of the second control signal is longer than a third set duration, and the third set duration is not shorter than 4 pulse widths.

4. The method of detection of claim 1, wherein the first drive signal comprises: at least one of a clock control signal, a pull-down sustain-off signal, and an enable signal of a pull-down sustain unit.

5. The detection method according to claim 1, wherein the off-drive mode further includes:

and sending a grounding control signal to a discharger electrically connected with the display panel so as to control the discharger to be conducted and grounded.

6. The detection method according to any one of claims 1 to 5, wherein the picture driving mode sequentially includes: a first driving mode and a second driving mode;

7. A display panel detection device, comprising:

a pixel driving module for transmitting a first control signal and a first driving signal to a pixel driving circuit in the display panel in a turn-off driving mode; the first control signal is used for controlling the pixel driving circuit to transmit the first driving signal to the pixel circuit so as to control the pixel circuit to be in a conducting state; the falling edge of the first control signal is later than the falling edge of the first driving signal;

the off-driving mode further includes:

8. A detection apparatus, characterized by comprising:

a memory electrically connected to the processor and configured to store machine readable instructions that, when executed by the processor, implement the method of detecting a display panel according to any one of claims 1-6.

9. The detection apparatus according to claim 8, characterized in that the detection apparatus further comprises: a discharger electrically connected to the processor;

10. A computer readable storage medium for storing computer instructions which, when run on a computer, implement a method of inspecting a display panel as claimed in any one of the preceding claims 1-6.