A display panel detection circuit and detection method, and a display device.

Abstract

This invention discloses a display panel detection circuit, detection method, and display device. In the display panel detection circuit, a pixel driving module stops outputting a first power supply to the first end of the light-emitting element during the panel detection stage. The panel detection stage sequentially includes a charging stage, a discharging stage, and a detection stage. A first storage module is connected in parallel with the light-emitting element. A detection control module connects a voltage writing module to the first end of the light-emitting element during the panel detection stage. The voltage writing module transmits a charging voltage to the first end of the light-emitting element during the charging stage and stops transmitting the charging voltage to the first end of the light-emitting element during the discharging and detection stages. The detection module outputs the residual voltage from the first end of the first storage module as a detection voltage to the controller during the detection stage. The technical solution provided by this invention can improve the detection capability of defective points in sub-pixels of the display panel.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display panel detection circuit and detection method, and a display device. Background Technology

[0002] OLED, or Organic Light-Emitting Diode, refers to the phenomenon where light-emitting materials emit light through carrier injection and recombination under the influence of an electric field. Compared to liquid crystal displays (LCDs), OLED displays are thinner and lighter, and offer better viewing angles and contrast, thus attracting widespread attention.

[0003] During the manufacturing process of organic light-emitting display panels, factors such as processes and impurities can cause some light-emitting elements to become defective or even dead pixels, resulting in bright spots and black spots. This not only affects the display effect of the panel but also shortens the lifespan of the light-emitting elements. Therefore, it is necessary to inspect the display panel for defects.

[0004] In existing technologies, when testing a display panel, the detection voltage is often input to the pixel driving circuit via data signals and scan signals. For example... Figure 1 As shown, Figure 1 This is a schematic diagram of a pixel driving circuit in the prior art. When the scan signal SCAN is enabled, the switch T1 is turned on, and the detection signal, as the data signal Vdata, is transmitted through the switch T1 to the control terminal of the power transistor T2, causing the power transistor T2 to turn on. A working current is then formed between the power supply signal PVDD, the light-emitting element OLED, and the power supply signal PVEE. Subsequently, the emission state of the light-emitting element OLED is used to determine whether the pixel is defective. However, this detection method cannot eliminate the influence of other components in the pixel driving circuit on the display state, resulting in low detection accuracy. Furthermore, with a large number of pixels on the entire panel, inspectors are prone to errors during inspection, leading to a low detection rate for defective pixels. Summary of the Invention

[0005] This invention provides a display panel detection circuit, detection method, and display device to improve the detection capability of defective points in sub-pixels of the display panel.

[0006] In a first aspect, embodiments of the present invention provide a display panel detection circuit, comprising: a pixel driving module, a first storage module, a detection control module, a voltage writing module, and a detection module;

[0007] The pixel driving module is connected to the first end of the light-emitting element and is used to stop outputting the first power supply to the first end of the light-emitting element during the panel detection stage; the panel detection stage includes a charging stage, a discharging stage and a detection stage in sequence; the first end of the first storage module is connected to the first end of the light-emitting element; the second end of the first storage module is connected to the second end of the light-emitting element; the detection control module is used to connect the voltage writing module to the first end of the light-emitting element during the panel detection stage;

[0008] The voltage writing module is connected to the detection and control module and is used to transmit the charging voltage to the first end of the light-emitting element during the charging phase, and to stop transmitting the charging voltage to the first end of the light-emitting element during the discharging phase and the detection phase.

[0009] The detection module is connected to the detection control module and is used to output the residual voltage output from the first terminal of the first storage module as the detection voltage to the controller during the detection phase.

[0010] As a preferred embodiment of the display panel, the display panel detection circuit may further include: an analog-to-digital conversion module; the analog-to-digital conversion module is connected to the detection module and is used to convert the detection voltage from an analog signal into a digital signal and transmit it to the controller.

[0011] As a preferred embodiment of the display panel, after the panel detection stage, the panel further includes a digital processing stage and a graphic display stage. The controller is used to acquire the defective light-emitting element with abnormal residual voltage during the digital processing stage. The controller is also used to control the pixel driving module to display an indicator graphic on the display panel to identify the defective light-emitting element during the graphic display stage. The detection control module is also used to disconnect the voltage writing module from the first end of the light-emitting element during the graphic display stage.

[0012] As a preferred embodiment of the display panel, the pixel driving module may include: a first switching transistor, a first driving transistor, and a first capacitor; the first switching transistor is used to connect a data signal line and the control terminal of the first driving transistor; the control terminal of the first switching transistor acquires a first control signal; the first driving transistor is used to connect a first power supply and a first terminal of the light-emitting element; the first terminal of the first capacitor is connected to the control terminal of the first driving transistor; the second terminal of the first capacitor is connected to the first terminal of the light-emitting element; during the panel detection stage, the first control signal is in an invalid level state.

[0013] As a preferred embodiment of the display panel, the first storage module may include: a second capacitor; a first end of the second capacitor is connected to a first end of the light-emitting element; and a second end of the second capacitor is connected to a second end of the light-emitting element.

[0014] As a preferred embodiment of the display panel, the detection control module may include: a second switching transistor; the second switching transistor is used to connect the first terminal of the light-emitting element and the voltage writing module; the control terminal of the second switching transistor acquires a second control signal; during the panel detection stage, the second control signal is in an active level state.

[0015] As a preferred embodiment of the display panel, the voltage writing module may include: a first switch; the first switch is connected to the detection control module and the charging voltage respectively; the first switch is closed during the charging phase and opened during the discharging phase and the detection phase.

[0016] As a preferred embodiment of the display panel, the detection module may include: a third capacitor; a first terminal of the third capacitor is connected to the detection control module; a second terminal of the third capacitor is connected to ground; and the first terminal of the third capacitor is connected to the output terminal of the detection module.

[0017] Secondly, embodiments of the present invention provide a display panel detection method, applicable to the display panel detection circuit provided in any embodiment of the present invention, the display panel detection method comprising:

[0018] During the panel detection phase, the pixel driving module stops outputting the first power supply to the first terminal of the light-emitting element, and the detection control module connects the voltage writing module to the first terminal of the light-emitting element. The panel detection phase sequentially includes a charging phase, a discharging phase, and a detection phase.

[0019] During the charging phase, the control voltage writing module transmits the charging voltage to the first terminal of the light-emitting element; the first storage module performs the charging operation.

[0020] During the discharge phase, the voltage writing module is controlled to stop transmitting the charging voltage to the first terminal of the light-emitting element; the first storage module performs a discharge operation through the light-emitting element.

[0021] During the detection phase, the control detection module outputs the residual voltage from the first terminal of the first storage module as the detection voltage to the controller.

[0022] Thirdly, embodiments of the present invention also provide a display device, including the display panel detection circuit provided in any embodiment of the present invention.

[0023] In this invention, the display panel detection circuit includes a panel detection stage, which further includes a charging stage, a discharging stage, and a detection stage. During the entire panel detection stage, the pixel driving module stops driving the light-emitting element. Instead, the detection control module connects the voltage writing module and the light-emitting element to provide the driving voltage for the light-emitting element with the charging voltage. It is important to note that the first storage module is connected in parallel with the light-emitting element. Therefore, during the charging stage, the voltage writing module transmits the charging voltage to the first storage module for charging; during the discharging stage, the first storage module discharges through the light-emitting element; and during the detection stage, the detection module acquires the residual voltage of the first storage module and transmits it to the controller, allowing the controller to judge the performance of the light-emitting element. Because the residual voltage of the first storage module is the conduction voltage of the light-emitting element, when the conduction voltage of the light-emitting element is within an unreasonable range, the light-emitting element is directly determined to be a defective element. This embodiment allows the controller to directly determine whether the light-emitting element is a defective or dead pixel, eliminating the need for detection using other data such as data signals. This effectively eliminates the influence of other devices in the pixel driving circuit on the detection results, improving the accuracy of defect detection. Furthermore, the present invention can directly locate defective light-emitting elements through the controller, thereby improving the efficiency of defect detection and enhancing the defect detection capability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a pixel driving circuit in the prior art;

[0025] Figure 2 This is a schematic diagram of a display panel detection circuit provided in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of another display panel detection circuit provided in an embodiment of the present invention;

[0027] Figure 4 This is a diagram illustrating the detection effect of defective light-emitting elements provided in an embodiment of the present invention.

[0028] Figure 5 for Figure 4 Enlarged view of a portion of region B in the middle area;

[0029] Figure 6 This is a schematic diagram of another display panel detection circuit provided in an embodiment of the present invention;

[0030] Figure 7 for Figure 6 Timing diagram of the detection circuit for the central display panel;

[0031] Figure 8 This is a flowchart illustrating a display panel detection method provided in an embodiment of the present invention.

[0032] Figure 9This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0034] The present invention will now be described in detail with reference to the accompanying drawings.

[0035] Figure 2 This is a schematic diagram of a display panel detection circuit provided in an embodiment of the present invention. Figure 2 As shown, the display panel detection circuit includes: a pixel driving module 11, a first storage module 12, a detection control module 13, a voltage writing module 14, and a detection module 15;

[0036] The pixel driving module 11 is connected to the first end of the light-emitting element D1 and is used to stop outputting the first power supply EVDD to the first end of the light-emitting element D1 during the panel detection stage. The panel detection stage includes a charging stage, a discharging stage and a detection stage in sequence. The first end of the first storage module 12 is connected to the first end of the light-emitting element D1. The second end of the first storage module 12 is connected to the second end of the light-emitting element D1. The detection control module 13 is used to connect the voltage writing module 14 to the first end of the light-emitting element D1 during the panel detection stage.

[0037] The voltage writing module 14 is connected to the detection control module 13 and is used to transmit the charging voltage to the first end of the light-emitting element D1 during the charging phase, and to stop transmitting the charging voltage to the first end of the light-emitting element D1 during the discharging phase and the detection phase.

[0038] The detection module 15 is connected to the detection control module 13 and is used to output the residual voltage output from the first terminal of the first storage module 12 as the detection voltage Sensing Line to the controller during the detection phase.

[0039] In this embodiment of the invention, the display panel detection circuit includes a panel detection stage, which further includes a charging stage, a discharging stage, and a detection stage. During the entire panel detection stage, the pixel driving module stops driving the light-emitting element, and the detection control module connects the voltage writing module and the light-emitting element to provide the driving voltage for the light-emitting element with the charging voltage. It should be noted that the first storage module is connected in parallel with the light-emitting element. Therefore, during the charging stage, the voltage writing module transmits the charging voltage to the first storage module for charging; during the discharging stage, the first storage module discharges through the light-emitting element; during the detection stage, the detection module can obtain the residual voltage of the first storage module and transmit it to the controller, allowing the controller to judge the performance of the light-emitting element. Because the residual voltage of the first storage module is the conduction voltage of the light-emitting element, when the conduction voltage of the light-emitting element is within an unreasonable range, the light-emitting element is directly determined to be a defective light-emitting element. This embodiment can directly obtain whether the light-emitting element is a defective or bad pixel through the controller, without needing to detect it through other data such as data signals, effectively eliminating the influence of other devices in the pixel driving circuit on the detection results and improving the accuracy of defect detection. Furthermore, the present invention can directly locate defective light-emitting elements through the controller, thereby improving the efficiency of defect detection and enhancing the defect detection capability.

[0040] The above is the core idea of ​​this invention. The technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0041] Continue to refer to Figure 2 In this embodiment, the display panel detection circuit for screening defective sub-pixels or bad pixels includes: a pixel driving module 11, a first storage module 12, a detection control module 13, a voltage writing module 14, and a detection module 15. These modules are mainly used to perform the panel detection stage. Specifically, the pixel driving module 11 does not output the first power supply EVDD to the light-emitting element D1 during the panel detection stage; that is, the pixel driving module 11 does not drive the light-emitting element D1 during the panel detection stage. The charging voltage that drives the light-emitting element D1 to emit light comes from the voltage writing module 14. The detection control module 13 can connect the first terminal of the light-emitting element D1 to the voltage writing module 14, and can also disconnect the first terminal of the light-emitting element D1 from the voltage writing module 14. In this embodiment, during the panel detection stage, the detection control module 13 needs to continuously connect the first terminal of the light-emitting element D1 to the voltage writing module 14. The panel detection stage sequentially includes a charging stage, a discharging stage, and a detection stage. It should be noted that the second terminal of the light-emitting element D1 can be connected to ground, or as... Figure 2As shown, a second power supply VSS is connected. The second power supply VSS is smaller than the first power supply EVDD.

[0042] During the charging phase, the voltage writing module 14 transmits the charging voltage to the first terminal of the light-emitting element D1 via the detection and control module 13. It should be noted that in this embodiment, the first storage module 12 is connected in parallel with the light-emitting element D1. Therefore, the charging voltage is also transmitted to the first terminal of the first storage module 12, thus charging the first storage module 12.

[0043] During the discharge phase, the voltage writing module 14 stops transmitting the charging voltage to the first terminal of the first storage module 12. At this time, the first storage module 12 can discharge through the light-emitting element D1, and the output voltage Vs of the first terminal of the first storage module 12 continues to decrease until the output voltage of the first terminal of the first storage module 12 reaches the threshold voltage of the light-emitting element D1. At this point, the output voltage Vs no longer decreases; this is referred to as the residual voltage in this embodiment. The detection module 15 is connected to the detection control module 13, and the detection module 15 transmits the aforementioned residual voltage to the controller (…). Figure 2 (Not shown in the image). In this embodiment, the controller can be the main controller on the main board of the display panel, or other controllers on the main board; this embodiment does not limit this. Due to the manufacturing process or impurities of the light-emitting element D1, the threshold voltage of different light-emitting elements D1 is different. This embodiment obtains the threshold voltage range of qualified light-emitting elements D1. When the residual voltage is not within the above threshold voltage range, it means that the current light-emitting element D1 is a defective light-emitting element. For example, the light-emitting element D1 is set with a preset threshold value. If the light-emitting element D1 is manufactured ideally, its threshold voltage is equal to or close to the preset threshold value. However, during the manufacturing process of the light-emitting element D1, there may be defects in the manufacturing process. When there are partial defects, the voltage value of the threshold voltage (residual voltage) is higher than the preset threshold value, and the more severe the defects, the higher the voltage value of the threshold voltage. For example, light-emitting elements with a threshold voltage higher than the preset threshold value can be classified as defective points or bad points. In this embodiment, the yield of the light-emitting element D1 itself is directly detected by the display panel detection circuit, which improves the detection efficiency and accuracy, and enhances the detection capability of defective points of the sub-pixels of the display panel.

[0044] Figure 3This is a schematic diagram of another display panel detection circuit provided in an embodiment of the present invention. Optionally, the display panel detection circuit may further include: an analog-to-digital conversion module 16; the analog-to-digital conversion module 16 is connected to the detection module 15 and is used to convert the detection voltage Sensing Line from an analog signal to a digital signal and transmit it to the controller. Because the controller is a microcontroller or other digital processor, in this embodiment, an analog-to-digital conversion module 16 can be formed between the detection module 15 and the controller, which facilitates the controller to analyze the above-mentioned detection voltage (residual voltage) and screen out sub-pixels with abnormal residual voltage, thereby improving the detection capability of defective sub-pixels.

[0045] Continue to refer to Figure 2 and Figure 3 Optionally, the display panel detection circuit may further include a digital processing stage and a graphic display stage; the controller is used to acquire the defective light-emitting element with abnormal residual voltage in the digital processing stage; the controller is also used to control the pixel driving module 11 to display an indicator graphic on the display panel to identify the defective light-emitting element in the graphic display stage; the detection control module 13 is also used to disconnect the voltage writing module 14 from the first terminal of the light-emitting element D1 in the graphic display stage.

[0046] In this embodiment, after the panel detection stage, a digital processing stage and a graphic display stage may be included. During the digital processing stage, the controller can filter out defective light-emitting elements D1 with abnormal residual voltage. Then, the graphic display stage is executed. In the graphic display stage, the controller controls the pixel driving module 11 to drive the light-emitting elements D1, causing the light-emitting elements D1 to form an indicator pattern to mark the defective light-emitting elements, such as... Figure 4 As shown, Figure 4 The image shows the detection effect of defective light-emitting elements provided in the embodiments of the present invention. Figure 4 As shown, the display panel marks area B of the faulty light-emitting element with a crosshair arrow, as... Figure 5 As shown, Figure 5 for Figure 4 A magnified view of area B in the middle section. The magnified view clearly shows the defective light-emitting elements. Inspectors can process these elements according to their needs. For example, if the defective element is severely missing, it can be directly removed as a dead pixel; if the defect is not severe, it can be retained as normal. This embodiment can select the correct dead pixels based on the magnified display area and user requirements, improving the detection efficiency of defective light-emitting elements. Furthermore, during the graphic display stage, since the pixel driving module 11 drives the light-emitting element D1, the detection control module 13 can directly control the voltage writing module 14 to disconnect the first terminal of the light-emitting element D1, preventing the charging voltage from affecting the display of defective light-emitting elements and improving the detection efficiency of sub-pixels.

[0047] Figure 6 This is a schematic diagram of another display panel detection circuit provided in an embodiment of the present invention. Figure 7 for Figure 6 The timing diagram of the display panel detection circuit is shown below. Optionally, the pixel driving module 11 may include: a first switch transistor T11, a first driving transistor TFT11, and a first capacitor C1; the first switch transistor T11 is used to connect the data signal line DT and the control terminal of the first driving transistor TFT11; the control terminal of the first switch transistor T11 acquires a first control signal SC; the first driving transistor TFT11 is used to connect the first power supply EVDD and the first terminal of the light-emitting element D1; the first terminal of the first capacitor C1 is connected to the control terminal of the first driving transistor TFT11; the second terminal of the first capacitor C1 is connected to the first terminal of the light-emitting element D1; during the panel detection stage, the first control signal SC is in an invalid level state. In this embodiment, the pixel driving module 11 includes a first switch transistor T11, a first driving transistor TFT11, and a first capacitor C1, which is roughly the same as the pixel driving circuit structure in the prior art. Therefore, in this embodiment, the display panel detection circuit can reuse the existing pixel driving circuit, and there is no need to set up a separate pixel driving module 11 on the display panel, reducing the number of components and making the overall structure of the display panel more streamlined. It is important to note that the data signal line DT can connect to the display panel controller to acquire data signals. During the panel detection phase, because the first switching transistor T11 is turned off, the controller does not need to send data signals to the data signal line DT. During the graphic display phase, the data signal line DT can acquire data signals and send them to the first switching transistor T11, so that the first driving transistor TFT11 is driven by the data signal, thereby driving the light-emitting element D1. By controlling the magnitude of the data signal, the grayscale of the light-emitting element D1 is controlled, so that the light-emitting elements D1 on the entire display panel display indicator graphics.

[0048] Continue to refer to Figure 6 and Figure 7 Optionally, the first storage module 12 may include: a second capacitor C2; the first end of the second capacitor C2 is connected to the first end of the light-emitting element D1; the second end of the second capacitor C2 is connected to the second end of the light-emitting element D1. For example... Figure 7As shown, in the charging phase S1, the charging voltage Vini charges the second capacitor C2, and the output voltage Vs at the first terminal of the second capacitor C2 gradually increases to Vini. In the discharging phase S2, the charging voltage Vini stops charging the second capacitor C2, and the output voltage Vs at the first terminal of the second capacitor C2 gradually decreases to the threshold voltage Vth of the light-emitting element D1. In this embodiment, the value of Vini is much larger than Vth. In the detection phase S3, because the detection module 15 is connected to the first terminal of the second capacitor C2 through the detection control module 13, the detection voltage is the output voltage Vs at the first terminal of the second capacitor C2. In the detection phase S3, the detection voltage is the residual voltage. The second capacitor C2 can directly obtain the threshold voltage Vth of the light-emitting element D1 through the charging and discharging process, which facilitates the controller to detect defective pixels.

[0049] Continue to refer to Figure 6 and Figure 7 Optionally, the detection control module 13 may include: a second switch T12; the second switch T12 is used to connect the first terminal of the light-emitting element D1 and the voltage writing module 14; the control terminal of the second switch T12 acquires the second control signal SE; during the panel detection stage, the second control signal SE is in an active level state.

[0050] Optionally, the voltage writing module 14 may include: a first switch SW_INI0; the first switch SW_INI0 is connected to the detection control module 13 and the charging voltage respectively; the first switch SW_INI0 is closed during the charging phase and open during the discharging and detection phases. Figure 7 As shown, if the first switch SW_INI0 is in the ON state, the signal SW_INI is in the active level state; if the first switch SW_INI0 is in the OFF state, the signal SW_INI is in the active level state.

[0051] Continue to refer to Figure 6 Optionally, the detection module 15 may include: a third capacitor C3; the first end of the third capacitor C3 is connected to the detection control module 13; the second end of the third capacitor C3 is connected to ground; and the first end of the third capacitor C3 is connected to the output terminal of the detection module 15. To further enhance the accuracy of the output detection voltage of the detection module 15, the third capacitor C3 can be set as a voltage regulator capacitor, thereby further improving the detection capability of defective points of the sub-pixels of the display panel.

[0052] Based on the same concept, embodiments of the present invention also provide a display panel detection method, applicable to the display panel detection circuit provided in any embodiment of the present invention. Figure 8 This is a flowchart illustrating a display panel detection method provided in an embodiment of the present invention, as shown below. Figure 8 As shown, the method in this embodiment includes the following steps:

[0053] Step S110: During the panel detection stage, control the pixel driving module to stop outputting the first power supply to the first end of the light-emitting element, and control the detection control module to connect the voltage writing module to the first end of the light-emitting element.

[0054] The panel testing stage includes the charging stage, the discharging stage, and the testing stage in sequence.

[0055] Step S120: During the charging phase, the control voltage writing module transmits the charging voltage to the first end of the light-emitting element; the first storage module performs the charging operation.

[0056] Step S130: During the discharge phase, the control voltage writing module stops transmitting charging voltage to the first end of the light-emitting element; the first storage module performs a discharge operation through the light-emitting element.

[0057] Step S140: During the detection phase, the control detection module outputs the residual voltage from the first terminal of the first storage module as the detection voltage to the controller.

[0058] In this embodiment of the invention, the display panel detection circuit includes a panel detection stage, which further includes a charging stage, a discharging stage, and a detection stage. During the entire panel detection stage, the pixel driving module stops driving the light-emitting element. Instead, the detection control module connects the voltage writing module and the light-emitting element to provide the driving voltage for the light-emitting element using the charging voltage. It is important to note that the first storage module is connected in parallel with the light-emitting element. During the charging stage, the voltage writing module transmits the charging voltage to the first storage module for charging; during the discharging stage, the first storage module discharges through the light-emitting element; during the detection stage, the detection module acquires the residual voltage of the first storage module and transmits it to the controller, allowing the controller to judge the performance of the light-emitting element. Because the residual voltage of the first storage module is the conduction voltage of the light-emitting element, when the conduction voltage of the light-emitting element is within an unreasonable range, the light-emitting element is directly determined to be a defective element. This embodiment allows the controller to directly determine whether the light-emitting element is a defective or bad pixel, eliminating the need for detection using other data such as data signals. This effectively eliminates the influence of other devices in the pixel driving circuit on the detection results, improving the accuracy of defect detection. Furthermore, the present invention can directly locate defective light-emitting elements through the controller, thereby improving the efficiency of defect detection and enhancing the defect detection capability.

[0059] This invention also provides a display device. Figure 9 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention, such as... Figure 9 As shown, the display device provided in this embodiment of the invention includes the display panel detection circuit 200 described in any embodiment of the invention. The display device can be as follows: Figure 9The mobile phone shown can also be a computer, television, smart wearable device, etc., and this embodiment does not make any special limitation on it.

[0060] It should be noted that the display device provided in the embodiments of the present invention has the technical features of the display panel detection circuit provided in any embodiment of the present invention, and has the beneficial effects of the corresponding technical features, which will not be repeated here.

[0061] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A display panel detection circuit, characterized in that, include: Pixel driving module, first storage module, detection control module, voltage writing module and detection module; The pixel driving module is connected to the first end of the light-emitting element and is used to stop outputting the first power supply to the first end of the light-emitting element during the panel detection stage; the panel detection stage includes a charging stage, a discharging stage and a detection stage in sequence; the first end of the first storage module is connected to the first end of the light-emitting element; the second end of the first storage module is connected to the second end of the light-emitting element. The detection control module is used to connect the voltage writing module to the first end of the light-emitting element during the panel detection stage. The voltage writing module is connected to the detection and control module and is used to transmit the charging voltage to the first end of the light-emitting element during the charging phase, and the first storage module performs the charging operation. And is used to stop transmitting the charging voltage to the first end of the light-emitting element during the discharge phase and the detection phase; and during the discharge phase, the first storage module performs a discharge operation through the light-emitting element; The detection module is connected to the detection control module and is used to output the residual voltage output from the first terminal of the first storage module as the detection voltage to the controller during the detection stage. When the residual voltage is not within the threshold voltage range, the current light-emitting element is determined to be a faulty light-emitting element.

2. The display panel detection circuit according to claim 1, characterized in that, Also includes: Analog-to-digital conversion module; The analog-to-digital conversion module is connected to the detection module and is used to convert the detection voltage from an analog signal to a digital signal and transmit it to the controller.

3. The display panel detection circuit according to claim 1, characterized in that, Following the panel detection stage, the system also includes a digital processing stage and a graphics display stage. The controller is used to acquire the faulty light-emitting element with the residual voltage abnormality during the digital processing stage; The controller is also used to control the pixel driving module to display an indicator graphic on the display panel to identify the defective light-emitting element during the graphic display stage; the detection control module is also used to disconnect the voltage writing module from the first end of the light-emitting element during the graphic display stage.

4. The display panel detection circuit according to claim 1, characterized in that, The pixel driving module includes: a first switching transistor, a first driving transistor, and a first capacitor; The first switching transistor is used to connect the data signal line and the control terminal of the first driving transistor; the control terminal of the first switching transistor acquires the first control signal; the first driving transistor is used to connect the first power supply and the first terminal of the light-emitting element; the first terminal of the first capacitor is connected to the control terminal of the first driving transistor; the second terminal of the first capacitor is connected to the first terminal of the light-emitting element. During the panel detection phase, the first control signal is in an invalid level state.

5. The display panel detection circuit according to claim 1, characterized in that, The first storage module includes: a second capacitor; The first terminal of the second capacitor is connected to the first terminal of the light-emitting element; the second terminal of the second capacitor is connected to the second terminal of the light-emitting element.

6. The display panel detection circuit according to claim 1, characterized in that, The detection and control module includes: a second switching transistor; The second switch is used to connect the first terminal of the light-emitting element and the voltage writing module; the control terminal of the second switch receives a second control signal; During the panel detection phase, the second control signal is in an active level state.

7. The display panel detection circuit according to claim 1, characterized in that, The voltage writing module includes: a first switch; The first switch is connected to the detection control module and the charging voltage respectively; the first switch is closed during the charging phase and opened during the discharging phase and the detection phase.

8. The display panel detection circuit according to claim 1, characterized in that, The detection module includes: a third capacitor; The first terminal of the third capacitor is connected to the detection and control module; the second terminal of the third capacitor is connected to ground; and the first terminal of the third capacitor is connected to the output terminal of the detection module.

9. A method for detecting a display panel, characterized in that, The display panel detection method, applicable to any one of claims 1-8, comprises: During the panel detection phase, the pixel driving module stops outputting the first power supply to the first terminal of the light-emitting element, and the detection control module connects the voltage writing module to the first terminal of the light-emitting element. The panel detection phase sequentially includes a charging phase, a discharging phase, and a detection phase. During the charging phase, the control voltage writing module transmits the charging voltage to the first terminal of the light-emitting element; the first storage module performs the charging operation. During the discharge phase, the voltage writing module is controlled to stop transmitting the charging voltage to the first terminal of the light-emitting element; the first storage module performs a discharge operation through the light-emitting element. During the detection phase, the control detection module outputs the residual voltage from the first terminal of the first storage module as the detection voltage to the controller. When the residual voltage is not within the threshold voltage range, the current light-emitting element is determined to be a faulty light-emitting element.

10. A display device, characterized in that, Includes the display panel detection circuit described in any one of claims 1-8.

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