CN114038365A

CN114038365A - Display panel detection method, device, equipment and storage medium

Info

Publication number: CN114038365A
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: 2022-02-11
Anticipated expiration: 2041-11-29
Also published as: CN114038365B

Abstract

The embodiment of the application provides a display panel detection method, a display panel detection device, display panel detection equipment 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 transmitting 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. The embodiment of the application respectively prolongs the time that the pixel driving circuit and the pixel circuit are in the conducting state in the detected turn-off driving mode, so that residual charges in the display panel are released outwards, the liquid crystal polarization phenomenon caused by the residual charges is reduced, the interference of the residual charges on the judgment and detection result 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) products due to its 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, especially small-sized products, the defect of visible similar hot spots under the inspection screen is likely to occur during the inspection, thereby affecting the quality of the screen of the product and reducing the yield of the product.

Although the defective spot clusters are detected in the electric signal waveform of the inspection screen, the screens are normally displayed in other normal screens, and the results of RA (Reliability) tests are also normal. Therefore, the conventional detection method for the LCD product adopting the oxide material is easy to cause over-judgment of the detection result, so that the product yield is sacrificed.

Disclosure of Invention

The application provides a detection method, a device, equipment and a storage medium of a display panel aiming at the defects of the prior art, and aims to solve the technical problem that the detection method of an LCD product adopting an oxide material is easy to cause over judgment 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, which sequentially includes a picture driving mode and an off driving mode; the off driving mode includes:

stopping transmitting 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 drive mode further comprises: 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 to control the pixel driving circuit to be in a conducting state.

In one embodiment, the first driving signal is maintained for a time period not less than a first set time period, which is not less than 10 microseconds and not more than 500 microseconds.

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

In one embodiment, the second control signal has a sustain time not less than a third set time period 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 the pull-down sustain unit.

In one embodiment, the off drive mode further comprises: 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 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 driving signal to a pixel driving 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 driving signal to a pixel driving 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 a portion of the first data signal is in phase opposition to the second data signal.

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

the picture enabling module is used for stopping sending the picture enabling signal to the pixel circuit in the display panel under the drive mode of switching off;

the pixel driving module is used for sending 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.

In a third aspect, an embodiment of the present application provides a detection apparatus, including:

the processor is used for being electrically connected with the pixel circuit and the pixel driving circuit of the display panel respectively;

a memory, electrically connected to the processor, configured to store machine readable instructions, which when executed by the processor, implement the method for detecting a display panel as set forth in the first aspect.

In one embodiment, the detection apparatus 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, an embodiment of the present application provides a computer-readable storage medium for storing computer instructions, which, when executed on a computer, implement the method for detecting a display panel as set forth in the first aspect.

The beneficial technical effects brought by the technical scheme provided by the embodiment of the application comprise: in the detected turn-off driving mode, the time that the pixel driving circuit and the pixel circuit are in the conducting state is respectively prolonged, 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 the residual charges is reduced, the interference of the residual charges on the judgment detection result is reduced, and the detection accuracy is improved.

The falling edge of the first control signal is later than that 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 present 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 present 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 of which:

fig. 1 is a schematic view of a structural frame of a detection apparatus electrically connected to a display panel according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural framework diagram of another detection apparatus provided in the embodiments of the present application;

fig. 3 is a schematic flowchart illustrating a method for detecting a display panel according to an embodiment of the present disclosure;

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

fig. 5 is a schematic structural framework diagram of a detection apparatus according to an embodiment of the present disclosure;

fig. 6 is a timing diagram illustrating a specific method for detecting a display panel according to an embodiment of the present disclosure.

In the figure:

100-a detection device; 110-a processor; 120-a memory; 130-a discharger; 140-a bus; 150-a transceiver; 160-an input unit; 170-an output unit;

200-a detection device; 210-a picture enable module; 220-pixel driving module; 230-a ground drive module;

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

Detailed Description

Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

It will be understood by those within the art that, unless otherwise defined, 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. 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 the context clearly indicates otherwise. 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. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

The terms referred to in this application will first be introduced and explained:

a pixel circuit: and the circuit is used for driving the display device to work and displaying a display picture.

A pixel drive circuit: a circuit for driving opening and closing of the pixel circuit.

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

Control signals: a signal for driving the pixel driving circuit to open and close.

The driving signal: a signal for driving the pixel circuit to open and close.

A grounding control signal: 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 insufficiently stable characteristics, which easily causes charge residue. Particularly, in small-sized LCD products using oxide materials, static electricity is more easily introduced, and the static electricity residue causes polarization of liquid crystals, so that false defects like hot spots can be seen during the detection process due to the static electricity residue, the occurrence rate of the false defects is high, excessive determination of the conventional defects is directly affected, and the yield of the products is sacrificed. It is therefore necessary to reduce or even eliminate the static electricity after the inspection of the picture using the origin lamp.

The application provides a detection method, a detection device, a detection apparatus and a storage medium for a display panel, which aim to solve the above technical problems in the prior art.

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

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

The processor 110 is used for being electrically connected with 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, which when executed by the processor 110, implement any of the detection methods of the display panel 300 as described below. The detection method will be described in detail below, and will not be described herein.

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

In the off driving mode of detection, the time that the pixel driving circuit 320 and the pixel circuit 310 are in the on state is respectively prolonged, so that the residual charges in the pixel driving circuit 320 and the pixel circuit 310 of the display panel 300 are released outwards, the liquid crystal polarization phenomenon 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.

Moreover, the falling edge of the first control signal is later than the falling edge of the first driving signal, which is beneficial to the pixel driving circuit 320 to drive the pixel circuit 310 to keep the conducting state before the pixel circuit 310 releases the residual charges sufficiently, so that the residual charges in the pixel driving circuit 320 and the pixel circuit 310 can be released sufficiently.

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 ground the pixel circuit 310 and the pixel driving circuit 320 of the display panel 300, respectively, under the control of the processor 110.

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

The Processor 110 may be a CPU (Central Processing Unit), a general-purpose Processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor 110 may also be a combination of computing functions, e.g., comprising one or more microprocessors, a combination of a DSP and a microprocessor, or the like.

Bus 140 may include a path that transfers information between the above components. The bus 140 may be a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus 140 may be divided 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 it is not intended that there be only one bus or one type of bus.

The Memory 120 may be a ROM (Read-Only Memory) or other type of static storage device that can store static information and instructions, a RAM (random access Memory) or other type of dynamic storage device that can store information and instructions, an EEPROM (Electrically Erasable Programmable Read-Only Memory), a CD-ROM (Compact Disc Read-Only Memory) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), a magnetic disk storage medium or other magnetic storage device, 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, but is not limited to these.

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

Optionally, the detection device may further comprise an input unit 160. The input unit 160 may be used to receive input numeric, character, image and/or sound information or to generate key signal inputs related to user settings and function control of the sensing apparatus. 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 trackball, a mouse, a joystick, a camera, a microphone, and the like.

Optionally, the detection apparatus may further include 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 scheme of the present application, and is controlled by the processor 110 to execute. The processor 110 is configured to execute the application program codes stored in the memory 120 to implement any one of the detection methods for a display panel provided by the embodiments of the present application.

It will be appreciated by those skilled in the art that the detection apparatus provided in the foregoing embodiments of the present application may be specially designed and manufactured for the required purposes, or may comprise known apparatus found in general purpose computers. These devices have stored therein computer programs 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 respectively coupled to a bus.

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 includes the following steps S101 to 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 respectively prolonged, so that the 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 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, an embodiment of the present application provides another method for detecting a display panel, where a schematic flow diagram of a turn-off driving mode in the method is shown in fig. 4, and 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 discharging of the residual charges in the off driving mode may be realized by the processor in the detection device sending the first control signal and the first driving signal to the pixel driving circuit in the display panel.

In some possible embodiments, 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. So that the pixel driving circuit can drive the pixel circuit to keep a conducting state before the residual charge is sufficiently released by the pixel circuit, and the residual charge in the pixel driving circuit and the residual charge in the pixel circuit can be sufficiently released.

In some possible embodiments, the first driving signal is maintained for a time period not less than a first set time period, which 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 and thus to substantially release the residual charges in the pixel circuit.

In some possible embodiments, the first control signal has a holding time longer than that of the first driving signal by a second set time period, which is not less than 500 microseconds, so as to ensure that the pixel driving circuit remains in the on state for a sufficient time after the pixel circuit fully releases the residual charge, thereby fully releasing 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 the pull-down sustain unit.

It is understood that the first driving signal may also include other signals that can be used to drive the pixel circuits to open and close according to the specific type of the selected pixel driving circuit.

S203: 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 to control the pixel driving circuit to be in a conducting state.

In this step S203, a second control signal may be sent to the pixel driving circuit in the display panel by the processor in the detection device after the falling edge interval of the first control signal is set to a period to control the pixel driving circuit to be in a conducting state. Therefore, the pixel driving circuit can be controlled to realize compensation type conduction, and possible residual charges of each node in the pixel driving circuit can be fully released.

In some possible embodiments, the second control signal has a duration longer than a third set duration, which is not less than 4H microseconds, where H is a unit of the on-width (pulse width) of the control signal. The holding time of the second control signal is 4H microseconds, so that the electric charges possibly remaining at each node in the pixel driving circuit can be fully released, excessive time does not need to be occupied, and the whole detection efficiency is improved.

In one example, 1H can be 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 grounding control signal may be sent to the discharger electrically connected to the display panel through the processor in the detection device to control the conduction and grounding of the discharger, so as to facilitate the release of the residual charges in the pixel circuit and the pixel driving circuit of the display panel, and reduce the liquid crystal polarization phenomenon caused by the residual charges, thereby reducing the interference of the residual charges on the determination detection result and improving the detection accuracy.

Based on any one of the detection methods for a display panel provided by 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 second control signal and a third driving signal to a pixel driving 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 driving signal to a pixel driving 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.

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

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

The picture enable module 210 is configured to stop sending the picture enable signal and the data signal to the pixel circuits 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 display panel detection apparatus 200 of the present embodiment can perform any one of the display panel detection methods provided in the foregoing embodiments of the present application, and the implementation principles thereof are similar and will not be described herein again.

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

In some possible embodiments, the detection apparatus 200 further comprises: the driving module 230 is grounded. The ground driving module 230 is configured to send a ground control signal to a 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 embodiments, the picture enable module 210 is further configured to send a first picture enable signal and a first data signal to the pixel circuits in the display panel in a first driving mode of the picture driving modes; transmitting a third control signal and a second driving signal to a pixel driving 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 embodiments, 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 modes; transmitting a third control signal and a second driving signal to a pixel driving 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 a portion of the first data signal is in phase opposition to the second data signal.

Based on the same inventive concept, embodiments of the present application provide a computer-readable storage medium for storing computer instructions, which, when executed on a computer, implement any one of the detection methods for a display panel as provided in the foregoing embodiments.

The embodiment of the application provides various optional implementation modes of a computer-readable storage medium suitable for any one of the above display panel detection methods. 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 example.

A method for inspecting a display panel, as shown in fig. 6, includes: the first drive mode, the second drive mode, the off drive mode, and so on. Wherein:

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

STV: the start enable signal of one frame, i.e., the frame enable signal, Vgh is high and is generally about 20-30V.

CK: each clock control signal Vgh of the pixel driving circuit (e.g., GOA circuit) is represented as a high potential (generally about 20-30V).

TRST: the reset enable signal for one frame, i.e., the first control signal and the second control signal, Vgh represents a high potential, and is generally about 20 to 30V.

VGL/LVGL: the signal for keeping the GOA circuit being turned off by pulling down can be used as a driving signal of the pixel circuit; vgh represents a high potential, typically about 20-30V); vgm is expressed as a medium potential, a threshold voltage Vth for the card control TFT, and is generally about 5V; vgl is shown as a low potential, typically about-10V.

VDDO/VDDE: the enable signal of the pull-down holding unit for one frame is generally used alternately as a driving signal of the pixel circuit, and Vgh is a high potential, and is generally about 20 to 30V.

VCOM: the common voltage signal displayed by the pixels inside the panel is generally about 0V.

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

The critical signal hold times for each stage may be:

t1 > a fourth set duration, the fourth set duration being no greater than 500 μ s (microseconds);

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

t1 < t3 < t1+ a fourth set time period;

t2 < t4< t2+ a fourth set period;

t5> a first set time period, which is not less than 10 μ s and not more than 500 μ s;

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

t7 is TRST time, the node charges in the GOA region are cleared, t7> a third set time period, and the third set time period is more than or equal to 4H mu s. 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 conducting state is respectively prolonged, 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 the residual charges is reduced, the interference of the residual charges on the judgment detection result is reduced, and the detection accuracy is improved.

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

3. 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. So that the pixel driving circuit can drive the pixel circuit to keep a conducting state before the residual charge is sufficiently released by the pixel circuit, and the residual charge in the pixel driving circuit and the residual charge in the pixel circuit can be sufficiently released.

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

5. The maintaining time of the first control signal is longer than that of the first driving signal by a second set time length, so that the pixel driving circuit is ensured to be kept in a conducting state for a sufficient time after the residual charge is fully released by the pixel circuit, and the residual charge in the pixel driving circuit is fully released.

6. After the falling edge interval of the first control signal is set for a period, a second control signal is sent to a 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 holding time of the second control signal is not less than 4H microseconds, so that the electric charges possibly remaining at each node in the pixel driving circuit can be fully released, excessive time does not need to be occupied, and the whole detection efficiency is improved.

8. And sending a grounding control signal to a discharger electrically connected with the display panel to control the conduction and grounding of the discharger, so that residual charges in a pixel circuit and a pixel driving circuit of the display panel are released outwards, the liquid crystal polarization phenomenon caused by the residual charges is reduced, the interference of the residual charges on a judgment detection result is reduced, and the detection accuracy is improved.

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, which is beneficial to reducing the polarization probability or the polarization degree of liquid crystal molecules in the picture detection stage, and also can reduce the liquid crystal polarization phenomenon caused by charge residue, thereby reducing the interference of the charge residue on the judgment detection result and improving the detection accuracy.

Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.

In the description of the present application, it is to 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 those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any 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, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

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

Claims

1. The detection method of a display panel is characterized by comprising a picture drive mode and a turn-off drive mode in sequence; the off drive mode includes:

sending 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.

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

3. The detection method according to claim 1, wherein the off drive mode further comprises:

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 to control the pixel driving circuit to be in a conducting state.

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

and/or the maintaining time of the first control signal is longer than the maintaining 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 time length, and the third set time length is not less than 4 pulse widths.

5. The detection method according to 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 the pull-down sustain unit.

6. The detection method according to claim 1, wherein the off drive mode further comprises:

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.

7. The detection method according to any one of claims 1 to 6, wherein the picture driving mode comprises, in order: 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 driving signal to a pixel driving 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;

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 driving signal to a pixel driving 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;

8. An apparatus for inspecting a display panel, comprising:

9. A detection apparatus, comprising:

a memory, electrically connected to the processor, configured to store machine readable instructions, which when executed by the processor, implement a method of detecting a display panel according to any one of claims 1-7.

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

11. A computer-readable storage medium storing computer instructions for implementing a method for detecting a display panel according to any one of claims 1 to 7 when the computer instructions are run on a computer.