Driving method, driving circuit and display device of display panel

Abstract

The application provides a driving method, a driving circuit and a display device of a display panel. In the driving method of the display panel, a corresponding row scanning signal and a gray scale voltage are first output to a corresponding pixel unit row by row. When a non-target gray scale voltage is output to a target pixel unit, the anode voltage of a light emitting diode of the target pixel unit is detected or reset through a detection line. When a target gray scale voltage is output to the target pixel unit, the anode of the light emitting diode of the target pixel unit is switched to output a turn-off voltage. The voltage difference between the turn-off voltage and the cathode voltage of the light emitting diode is less than the threshold voltage of the light emitting diode, so that the light emitting diode of the target pixel unit is in a turn-off state when the target pixel unit displays a black picture, the target pixel unit is prevented from mis-emitting light due to lateral leakage of adjacent pixel units, and the lateral leakage phenomenon is improved.

Description

Technical Field

[0001] This invention belongs to the field of display panel technology, and particularly relates to a driving method, driving circuit and display device for a display panel. Background Technology

[0002] With the continuous iteration and upgrading of display technology, Organic Light-Emitting Diode (OLED) has become one of the mainstream technologies in the current display field due to its unique technological advantages, and has been widely used in various display terminals such as smartphones, tablets, laptops, televisions, and smart wearable devices. Compared with traditional Liquid Crystal Display (LCD) technology, OLED technology has significant advantages such as low power consumption, fast response speed, wide viewing angle, high resolution, wide temperature adaptability, flexible display capability, and lightweight finished product. These advantages have enabled OLED to occupy an important position in the high-end display market, and have also driven global display manufacturers to invest in the research and development and industrialization of OLED technology, further accelerating the maturity and popularization of OLED technology.

[0003] In the structural design of OLED display panels, the pixel unit is the core smallest unit for realizing image display. Its arrangement and driving architecture directly determine the display effect, power consumption level, and stability of the display panel. Currently, mainstream OLED display panels all use multiple pixel units arranged in an array. Each pixel unit typically includes a pixel driving unit and a light-emitting diode. In order to achieve full-color display, the pixel unit is usually divided into red pixel units, blue pixel units, and green pixel units. Through different combinations of the three primary colors and brightness adjustment, rich color display can be achieved.

[0004] In practical applications, existing OLED display panels still have a common and difficult-to-overcome technical problem in the industry, namely the lateral-leakage (LLC) phenomenon. This phenomenon seriously affects the display quality of OLED display panels and has become one of the key bottlenecks restricting the development of OLED technology towards higher resolution and higher image quality. It is also a common technical problem that the OLED industry urgently needs to solve.

[0005] In the stacked structure of OLED display panels, such as Figure 1As shown, the anodes of multiple pixel units are completely separate to receive the current output from their respective pixel driving units; while the hole transport layer and electron transport layer are shared by multiple pixel units, belonging to the common layer; the RGB organic light-emitting materials are set independently, while the cathode is shared by all pixel units, forming a stacked structure of "independent anode - common transport layer - common cathode". Among them, the hole transport layer, as a semiconductor material, has a certain degree of conductivity, which provides the material basis for the generation of lateral leakage current.

[0006] When an OLED display panel is working, if a pixel is emitting light, a high voltage is applied to its anode. Current is injected into the hole transport layer through the anode. Holes migrate in the hole transport layer and enter the green organic light-emitting material layer, where they recombine with electrons to emit light. However, because the hole transport layer is a common layer and has semiconductor properties, some holes do not migrate vertically to their own organic light-emitting material layer. Instead, they migrate laterally, moving downwards to adjacent pixel units (such as red and blue pixel units), causing adjacent pixel units to be falsely triggered to emit light.

[0007] Currently, industry solutions to the lateral leakage phenomenon in OLEDs mainly focus on two aspects: material improvement and device structure optimization. Regarding material improvement, some manufacturers are attempting to develop low-leakage hole transport layer materials. By optimizing the molecular structure of these materials, their lateral conductivity is reduced, thereby decreasing the lateral leakage current. However, the development of such materials is difficult and costly, and they cannot completely eliminate the lateral leakage phenomenon; they can only alleviate it to a certain extent, failing to fundamentally solve the problem, and may also affect the luminous efficiency and lifespan of the LEDs. Regarding device structure optimization, some solutions attempt to add isolation layers and optimize the layout of pixel units to reduce the lateral leakage paths between adjacent pixel units. However, this approach increases the complexity of the panel manufacturing process, raises production costs, and sacrifices the pixel density of the display panel, which is detrimental to the development of high-resolution display panels. Summary of the Invention

[0008] The purpose of this invention is to provide a driving method for a display panel, which aims to solve the problem of lateral leakage in traditional OLED display panels, which leads to false triggering of pixel units.

[0009] A first aspect of this invention provides a driving method for a display panel, the display panel including multiple rows of scan lines, multiple columns of data lines, multiple columns of detection lines, and multiple pixel units arranged in an array. Each pixel unit includes a pixel driving unit and a light-emitting diode (LED). The pixel unit is divided into red pixel units, blue pixel units, and green pixel units. The LEDs of the multiple pixel units are connected to a common cathode. The pixel driving unit is connected to the anode of the corresponding LED. Each pixel driving unit is connected to one scan line, one data line, and one detection line, respectively. The driving method for the display panel includes: Output the corresponding row scan signal and grayscale voltage to the corresponding pixel unit line by line; When outputting a non-target grayscale voltage to the target pixel unit, the anode voltage of the light-emitting diode of the target pixel unit is detected or reset through the detection line. The target pixel unit is one of the red pixel unit, blue pixel unit and green pixel unit, and the threshold voltage of the light-emitting diode of the target pixel unit is less than the threshold voltage of the light-emitting diode of the other two pixel units. When outputting the target grayscale voltage to the target pixel unit, the output shutdown voltage is switched to the detection line and transmitted to the anode of the light-emitting diode of the target pixel unit. The voltage difference between the shutdown voltage and the cathode voltage of the light-emitting diode is less than the threshold voltage of the corresponding light-emitting diode. The target grayscale voltage is the grayscale voltage corresponding to the pixel unit displaying a black image.

[0010] Optionally, the driving method for the display panel further includes: During line-by-line scanning and outputting the non-target grayscale voltage or the target grayscale voltage to the non-target pixel unit, the anode voltage of the light-emitting diode of the non-target pixel unit is detected or reset via the detection line.

[0011] Optionally, the turn-off voltage is less than the reset voltage when the light-emitting diode is reset.

[0012] Optionally, the pixel driving unit includes a first thin-film transistor, a second thin-film transistor, a third thin-film transistor, and a storage capacitor; The drain of the first thin-film transistor is connected to the data line; the source of the first thin-film transistor, the gate of the second thin-film transistor, and the first terminal of the storage capacitor are connected; the second terminal of the storage capacitor, the drain of the second thin-film transistor, and the positive voltage terminal are connected; the source of the second thin-film transistor, the drain of the third thin-film transistor, and the anode of the light-emitting diode are connected; the source of the third thin-film transistor is connected to the detection line; and the gates of the first thin-film transistor and the third thin-film transistor are connected to the scan line. The voltage difference between the target grayscale voltage and the turn-off voltage is less than the threshold voltage of the second thin-film transistor.

[0013] A second aspect of the present invention provides a driving circuit for a display panel, the display panel including multiple rows of scan lines, multiple columns of data lines, multiple columns of detection lines, and multiple pixel units arranged in an array. Each pixel unit includes a pixel driving unit and a light-emitting diode (LED). The pixel unit is divided into red pixel units, blue pixel units, and green pixel units. The LEDs of the multiple pixel units are connected to a common cathode. The pixel driving unit is connected to the anode of the corresponding LED. Each pixel driving unit is connected to one of the scan lines, one of the data lines, and one of the detection lines. The driving circuit of the display panel includes: A gate driving circuit is connected to multiple rows of data lines of the display panel. The gate driving circuit is used to output a controlled row scanning signal to scan the display panel row by row. The source driving circuit is connected to multiple rows of data lines of the display panel. The source driving circuit is used to output the corresponding target gray level voltage or non-target gray level voltage to the corresponding target pixel unit or non-target pixel unit in a controlled manner. Multiple mode switching circuits are respectively connected to the detection lines of multiple target pixel units. The mode switching circuits are used to detect or reset the anode voltage of the light-emitting diode of the target pixel unit according to the first control signal, or to output a shutdown voltage to the target pixel unit according to the second control signal. Multiple first detection and reset circuits are respectively connected to the detection lines of multiple non-target pixel units. The first detection and reset circuits are used to detect or reset the anode voltage of the light-emitting diode of the non-target pixel unit. A timing controller is connected to the gate driving circuit, the source driving circuit, and the mode switching circuit, respectively. The timing controller is used to output corresponding control signals to control the gate driving circuit, the source driving circuit, and the mode switching circuit to implement the display panel driving method described above.

[0014] Optionally, the mode switching circuit includes: The second detection and reset circuit is used to detect or reset the anode voltage of the light-emitting diode of the target pixel unit; Shutdown voltage output circuit, used to output shutdown voltage; A switching circuit is connected to the detection line corresponding to the target pixel unit, the second detection reset circuit, and the shutdown voltage output circuit, respectively. The switching circuit is used to connect the second detection reset circuit and the detection line corresponding to the target pixel unit according to the first control signal, or to switch the connection between the shutdown voltage output circuit and the detection line corresponding to the target pixel unit according to the second control signal.

[0015] Optionally, the shutdown voltage output circuit includes: A voltage selection circuit is connected to the timing controller. The voltage selection circuit is used to select and output a corresponding turn-off voltage according to the selection control signal of the timing controller. A voltage follower is connected between the switching circuit and the voltage selection circuit. The voltage follower is used to perform impedance transformation on the turn-off voltage output by the voltage selection circuit and then output it.

[0016] Optionally, the voltage selection circuit includes: Multiple voltage sources are used to output different levels of turn-off voltage. The selector switch is connected to multiple voltage sources and voltage followers respectively. The selector switch is used to switch the output of different shutdown voltages to the voltage followers according to the selection control signal.

[0017] A third aspect of the present invention provides a display device, including a display panel and a driving circuit for the display panel as described above, wherein the driving circuit for the display panel is connected to the display panel. The display panel includes multiple rows of scan lines, multiple columns of data lines, multiple columns of detection lines, and multiple pixel units arranged in an array. Each pixel unit includes a pixel driving unit and a light-emitting diode (LED). The pixel units are divided into red pixel units, blue pixel units, and green pixel units. The LEDs of multiple pixel units are connected to a common cathode. The pixel driving unit is connected to the anode of the corresponding LED. Each pixel driving unit is connected to one scan line, one data line, and one detection line.

[0018] Optionally, the pixel driving unit includes a first thin-film transistor, a second thin-film transistor, a third thin-film transistor, and a storage capacitor; The drain of the first thin-film transistor is connected to the data line; the source of the first thin-film transistor, the gate of the second thin-film transistor, and the first terminal of the storage capacitor are connected; the second terminal of the storage capacitor, the drain of the second thin-film transistor, and the positive voltage terminal are connected; the source of the second thin-film transistor, the drain of the third thin-film transistor, and the anode of the light-emitting diode are connected; the source of the third thin-film transistor is connected to the detection line; and the gates of the first thin-film transistor and the third thin-film transistor are connected to the scan line. The pixel driving unit further includes a voltage-regulating capacitor connected in parallel between the drain and source of the second thin-film transistor.

[0019] The beneficial effects of the present invention embodiments compared with the prior art are as follows: In the above-described display panel driving method, the corresponding row scanning signal and grayscale voltage are first output to the corresponding pixel unit line by line. When outputting a non-target grayscale to the target pixel unit, the anode voltage of the light-emitting diode of the target pixel unit is detected or reset by the detection line. When outputting the target grayscale voltage to the target pixel unit, the off voltage is switched to the anode of the light-emitting diode of the target pixel unit. The voltage difference between the off voltage and the cathode voltage of the light-emitting diode is less than the threshold voltage of the light-emitting diode, thereby ensuring that the light-emitting diode of the target pixel unit is in the off state when displaying a black screen, avoiding the target pixel unit from erroneously emitting light due to lateral leakage of adjacent pixel units, and improving the lateral leakage phenomenon. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the display panel provided in Embodiment 1 of the present invention; Figure 2 This is a circuit diagram of a pixel unit provided in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure of a pixel unit provided in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the current flow direction of the thin-film transistor effect provided in Embodiment 1 of the present invention; Figure 5 A waveform diagram of the thin-film transistor effect provided in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of wavelength and brightness provided in Embodiment 1 of the present invention; Figure 7 This is a flowchart illustrating the driving method for a display panel provided in Embodiment 1 of the present invention. Figure 8 This is a schematic diagram of the driving circuit and display device of the display panel provided in Embodiments 2 and 3 of the present invention; Figure 9This is a schematic diagram of the mode switching circuit provided in Embodiment 2 of the present invention; Figure 10 This is a circuit diagram of the mode switching circuit provided in Embodiment 2 of the present invention.

[0021] The figures in the diagram are labeled as follows: 100. Display panel; 200. Driving circuit for display panel; 210. Source driving circuit; 220. Gate driving circuit; 230. Mode switching circuit; 240. First detection and reset circuit; 250. Timing controller; 231. Second detection and reset circuit; 232. Shutdown voltage output circuit; 233. Switching circuit; 201. Voltage selection circuit; 21. Voltage source; 10. Pixel unit; 11. Pixel driving unit; S1, First data line; S2, Second data line; S3, Third data line; Sn-2, (n-2)th data line; Sn-1, (n-1)th data line; Sn, nth data line; G1, First scan line; G2, Second scan line; G3, Third scan line; G4, Fourth scan line; G5, Fifth scan line; Se1, First detection line; Se2, Second detection line; Se3, Third detection line; Sen-2, (n-2)th detection line; Sen-1, (n-1)th detection line; Sen, nth detection line; T1, First thin-film transistor; T2, Second thin-film transistor; T3, Third thin-film transistor; C1, Stabilizing capacitor; C2, Filter capacitor; Cst, Storage capacitor; OLED, Light-emitting diode; SW1, Single-pole double-throw switch; SW2, Selector switch; U1, Voltage follower; R, Red pixel unit; G, Green pixel unit; B, Blue pixel unit; ELVDD, positive voltage; ELVSS, cathode voltage; Voff, turn-off voltage. Detailed Implementation

[0022] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying 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 this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] Example 1 A first aspect of the present invention provides a driving method for a display panel 100.

[0025] Among them, the display panel 100 is suitable for OLED display technology, such as Figure 1 As shown, the display panel 100 includes multiple rows of scan lines, multiple columns of data lines, multiple columns of detection lines, and multiple pixel units 10 arranged in an array, constituting the display area of ​​the display panel 100. For example, the multiple columns of data lines include a first data line S1, a second data line S2, a third data line S3, a (n-2)th data line Sn-2, a (n-1)th data line Sn-1, and an nth data line Sn. The multiple rows of scan lines include a first scan line G1, a second scan line G2, a third scan line G3, a fourth scan line G4, and a fifth scan line G5, etc. The multiple columns of detection lines include a first detection line Se1, a second detection line Se2, a third detection line Se3, a (n-2)th detection line Sen-2, a (n-1)th detection line Sen-1, and an nth detection line Sen, etc.

[0026] like Figure 2 As shown, each pixel unit 10 includes a pixel driving unit 11 and a light-emitting diode (OLED). The pixel unit 10 is divided into a red pixel unit R, a blue pixel unit B, and a green pixel unit G. The three are arranged according to a preset rule to achieve full-color display. The light-emitting diodes (OLEDs) of multiple pixel units 10 are connected to a common cathode, that is, the cathodes of all light-emitting diodes (OLEDs) are connected to the cathode voltage terminal and receive a fixed cathode voltage ELVSS. The anode of the light-emitting diode (OLED) of each pixel unit 10 is connected to the output terminal of the corresponding pixel driving unit 11. The anode voltage is controlled by the pixel driving unit 11. Each pixel driving unit 11 is connected to a scan line, a data line, and a detection line.

[0027] The pixel driving unit 11 can adopt a corresponding nTmC architecture, such as a 7T1C or 3T1C architecture. In an optional embodiment, such as... Figure 2 As shown, the pixel driving unit 11 adopts a 3T1C architecture. The pixel driving unit 11 includes a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, and a storage capacitor Cst. The drain of the first thin-film transistor T1 is connected to the data line. The source of the first thin-film transistor T1, the gate of the second thin-film transistor T2, and the first terminal of the storage capacitor Cst are connected. The second terminal of the storage capacitor Cst, the drain of the second thin-film transistor T2, and the positive voltage terminal ELVDD are connected. The source of the second thin-film transistor T2, the drain of the third thin-film transistor T3, and the anode of the light-emitting diode OLED are connected. The source of the third thin-film transistor T3 is connected to the detection line. The gates of the first thin-film transistor T1 and the third thin-film transistor T3 are connected to the scan line. The first thin-film transistor T1 and the third thin-film transistor T3 receive the horizontal scanning signal transmitted by the scan line and turn on and off accordingly.

[0028] It should be noted that the pixel driving unit 11 is not limited to the 3T1C architecture. In other embodiments, other types of pixel driving architectures such as 4T1C and 5T1C can also be used. As long as the writing of grayscale voltage and the control and detection of anode voltage can be realized, they are all within the protection scope of this invention.

[0029] Multiple scan lines are arranged along the row direction. Each scan line corresponds to a row of pixel units 10 and is connected to the gate of the first thin-film transistor T1 and the gate of the third thin-film transistor T3 of all pixel units 10 in that row. The scan lines are used to transmit row scan signals, including row enable signals and row disable signals, to control the first thin-film transistor T1 and the third thin-film transistor T3 of the pixel unit 10 in that row to be turned on, thereby realizing row-by-row scanning addressing, ensuring that the grayscale voltage can be accurately written to the corresponding pixel unit 10, and at the same time realizing the detection and reset of the anode voltage.

[0030] Multiple data lines are arranged along the column direction. Each data line corresponds to a column of pixel units 10 and is connected to the drain of the first thin film transistor T1 of all pixel units 10 in that column. The data lines are used to transmit grayscale voltage signals. When the first thin film transistor T1 is turned on, the grayscale voltage is written into the storage capacitor Cst to control the conduction state of the second thin film transistor T2, thereby controlling the brightness of the light-emitting diode OLED.

[0031] Multiple detection lines are arranged along the column direction, with each detection line corresponding to a column of pixel units 10 and connected to the source of the third thin-film transistor T3 of all pixel units 10 in that column. When the non-target grayscale voltage is output, the detection lines can be used to detect or reset the anode voltage of the OLED of the pixel unit 10. When the target grayscale voltage is output, the detection lines can be used to output a turn-off voltage to the anode of the OLED of the target pixel unit, thereby achieving stable control of the anode voltage.

[0032] Among them, such as Figure 3 As shown, multiple pixel units 10 are connected with a common cathode, resulting in lateral leakage. To better understand the operating mechanism of lateral leakage, it can be compared with the thin-film transistor effect, such as... Figure 4 As shown, during lateral leakage, the common cathode corresponds to the gate of the thin-film transistor (TFT), the anode with applied high voltage corresponds to the source of the TFT, and the anode of the adjacent pixel unit 10 affected by leakage corresponds to the drain of the TFT; the hole transport layer corresponds to the channel of the TFT, and the laterally migrating holes correspond to the carriers in the channel. Assuming Igs represents the current from the gate to the source, Igd represents the current from the gate to the drain, Ids represents the current from the drain to the source, and Ichannel represents the channel current in the electric field, i.e., the lateral leakage current, the relationship between these currents is as follows: Is = Igs + Ichannel; Ig = Igs + Igd; Id= Igd Ichannel; Ids = Ichannel; Based on the above equations and the characteristics of the thin-film transistor effect, such as Figure 5 As shown, when the gate voltage increases, Ids increases, and Igd also increases due to the vertical leakage current. Therefore, the drain current Id needs to be determined by the difference between Igd and Ichannel: when the gate voltage increases from zero, Ids dominates; when the gate voltage continues to increase, Igd dominates. This characteristic makes the abnormal spectrum caused by lateral leakage particularly noticeable at low brightness, especially when a pixel unit 10 displays a black image. This pixel unit 10 should be in an off state, but due to the lateral leakage of adjacent pixel units 10, its anode voltage will be raised. If the voltage difference between the anode voltage and the cathode voltage ELVSS reaches its threshold voltage, it will cause the pixel unit 10 to be falsely triggered and lit, resulting in serious problems affecting display quality such as "grayish black image" and "dark field crosstalk". Figure 6 As shown, there are obvious abnormal spectra in the low-brightness areas, confirming the negative impact of lateral leakage on the display effect.

[0033] To improve the lateral leakage phenomenon, in this embodiment, as follows: Figure 7 As shown, the driving method for the display panel 100 includes: S10, output the corresponding row scan signal and grayscale voltage to the corresponding pixel unit 10 line by line.

[0034] In this embodiment, in order to achieve line-by-line addressing, the grayscale voltage is accurately written into the corresponding pixel unit 10 to control the light emission state of the pixel unit 10. The corresponding gate driving circuit 220 outputs row scanning signals to the scan lines line by line according to the control signal and a preset timing sequence. When a certain row of scan lines is high, the first thin-film transistors T1 and the third thin-film transistors T3 of all pixel units 10 in that row are turned on. At the same time, the source driving circuit 210 outputs grayscale voltage to the data lines of the corresponding column according to the corresponding control signal. The grayscale voltage is written into the storage capacitor Cst through the turned-on first thin-film transistor T1. The storage capacitor Cst holds the voltage signal and controls the conduction state of the second thin-film transistor T2: when the voltage across the storage capacitor Cst is greater than the threshold voltage of the second thin-film transistor T2, the second thin-film transistor T2 is turned on, and the current output from the positive voltage terminal ELVDD flows through the second thin-film transistor T2 to the anode of the light-emitting diode OLED. The light-emitting diode OLED emits light and outputs the corresponding brightness according to the grayscale voltage. When the voltage across the storage capacitor Cst is less than the threshold voltage of the second thin-film transistor T2, the second thin-film transistor T2 is turned off, and the light-emitting diode OLED is turned off.

[0035] It should be noted that the range of grayscale voltage is set according to the characteristics of the light-emitting diode OLED and the display requirements, and is usually 0~Vmax (Vmax is the maximum grayscale voltage). The target grayscale voltage is usually 0V or a low voltage close to 0V, and the non-target grayscale voltage is a voltage greater than the target grayscale voltage and less than or equal to Vmax. For example, when the display panel 100 includes grayscale values ​​from 0 to 255, when the grayscale value is 0, the grayscale voltage corresponding to the grayscale value is the target grayscale voltage, and the pixel unit 10 displays a black image. When the grayscale value is 255, the pixel unit 10 displays a white image. When the grayscale value is from 1 to 254, the pixel unit 10 displays the transition color between black and white.

[0036] S20. When outputting a non-target grayscale voltage to the target pixel unit, the anode voltage of the light-emitting diode (OLED) of the target pixel unit is detected or reset by the detection line. The target pixel unit is one of the red pixel unit, the blue pixel unit B, and the green pixel unit G, and the threshold voltage Vth1 of the light-emitting diode (OLED) of the target pixel unit is less than the threshold voltage Vth1 of the light-emitting diode (OLED) of the other two pixel units 10.

[0037] The target pixel unit refers to one of the red pixel unit R, the blue pixel unit B, and the green pixel unit G. The threshold voltage Vth1 of the light-emitting diode OLED of the target pixel unit is less than the threshold voltage Vth1 of the light-emitting diode OLED of the other two pixel units 10.

[0038] Based on the characteristics of existing OLED technology, the threshold voltage Vth1 of the light-emitting diode OLED of the red pixel unit R is usually the lowest. Correspondingly, in an optional embodiment, the target pixel unit is the red pixel unit R, and the non-target pixel units are the green pixel unit G and the blue pixel unit B. Of course, in other embodiments, if the threshold voltage Vth1 of the blue pixel unit B or the green pixel unit G is the lowest, it can also be used as the target pixel unit, and there is no limitation on this.

[0039] The target grayscale voltage refers to the grayscale voltage of the corresponding pixel unit 10 when displaying a black screen. At this time, the light-emitting diode (OLED) of the pixel unit 10 should be in an off state, and its brightness should be zero or close to zero.

[0040] Non-target grayscale voltage refers to the grayscale voltage when the corresponding pixel unit 10 displays a non-black screen, that is, in a normal light-emitting state, including grayscale of various brightness and color. At this time, the light-emitting diode OLED of the pixel unit 10 outputs light of corresponding brightness according to the magnitude of the grayscale voltage.

[0041] Reset voltage refers to the voltage applied to reset the anode of the OLED through the detection line when the non-target grayscale voltage is output. It is used to clear residual voltage on the anode and ensure the accuracy of the detection results and the uniformity of the display.

[0042] For non-black display states of target pixel units, a detection line is used to detect and reset the anode voltage, ensuring normal light emission and display uniformity of the target pixel unit. Specifically, when the target pixel unit needs to display a non-black image, the source drive circuit 210 outputs a non-target grayscale voltage to the data line. This voltage is written into the storage capacitor Cst through the conducting first thin-film transistor T1, controlling the second thin-film transistor T2 to conduct, causing the light-emitting diode (OLED) to emit light. At the same time, the anode voltage of the OLED is detected or reset through the detection line.

[0043] The purpose of detecting the anode voltage is to monitor the operating status of the OLED, obtain the actual value of the anode voltage, and then calculate the threshold voltage Vth2 of the second thin-film transistor T2. This provides a basis for subsequent voltage calibration, ensuring the stability of the driving current of the second thin-film transistor T2 and avoiding brightness unevenness caused by the drift of the threshold voltage Vth2. The purpose of resetting the anode voltage is to clear the residual anode voltage from the previous frame, ensuring that the grayscale voltage of the current frame can be accurately written, avoiding inter-frame interference, and improving the stability and uniformity of the display. The switching sequence of detection and reset can be adjusted according to requirements, such as resetting at the beginning of each frame scan and detecting during the scan, or flexibly switching according to display needs.

[0044] It should be noted that the threshold voltage Vth1 of the OLED light-emitting diode of the target pixel unit is the lowest, making it more susceptible to the influence of lateral leakage. Therefore, in the non-black display state, by monitoring the anode voltage in real time through the detection line, the voltage abnormality caused by lateral leakage can be detected in time, and the abnormality can be eliminated by the reset operation, ensuring the normal light emission of the target pixel unit. At the same time, it also lays a stable foundation for the shutdown voltage control in the subsequent black display state.

[0045] S30. When outputting the target grayscale voltage to the target pixel unit, switch the output shutdown voltage to the detection line and transmit it to the anode of the light-emitting diode OLED of the target pixel unit. The voltage difference between the shutdown voltage and the cathode voltage ELVSS of the light-emitting diode OLED is less than the threshold voltage Vth1 of the corresponding light-emitting diode OLED. The target grayscale voltage is the grayscale voltage of the corresponding pixel unit 10 that displays a black image.

[0046] The turn-off voltage refers to the voltage output to the anode of the light-emitting diode OLED of the target pixel unit through the detection line when the target pixel unit displays a black screen. Its core characteristic is that the voltage difference from the cathode voltage ELVSS of the light-emitting diode OLED is less than the threshold voltage Vth1 of the light-emitting diode OLED, ensuring that the light-emitting diode OLED will not be accidentally triggered to light up.

[0047] For the black display state of the target pixel unit, the turn-off voltage is output through the detection line to stabilize the anode voltage and avoid accidental light emission of the target pixel unit caused by lateral leakage of the adjacent pixel unit 10. Specifically, when the target pixel unit needs to display a black screen, the source driver circuit 210 outputs the target gray-scale voltage to the data line, and at the same time switches to the turn-off voltage output mode, and transfers the turn-off voltage to the anode of the light-emitting diode OLED through the detection line and the turned-on third thin-film transistor T3, so that the anode voltage is stabilized at the turn-off voltage level.

[0048] Among them, the voltage difference between the turn-off voltage and the cathode voltage ELVSS of the light-emitting diode OLED is less than the threshold voltage Vth1 of the light-emitting diode OLED, that is, Voff - ELVSS < Vth1, where Voff is the turn-off voltage. Since the light-emitting condition of the light-emitting diode OLED is that the voltage difference between the anode voltage and the cathode voltage ELVSS is greater than or equal to its threshold voltage Vth1, when this condition is met, regardless of whether there is lateral leakage in the adjacent pixel unit 10, the light-emitting diode OLED of the target pixel unit will not be accidentally triggered to light up, fundamentally solving the problem of accidental light emission of the black screen caused by lateral leakage.

[0049] Furthermore, the value of the turn-off voltage also needs to consider the turn-off state of the second thin-film transistor T2. In an optional embodiment, the voltage difference between the target gray-scale voltage and the turn-off voltage is less than the threshold voltage Vth2 of the second thin-film transistor T2, that is, Vdata - Voff < Vth2, ensuring that the second thin-film transistor T2 is in a completely turned-off state and avoiding the superposition of the off-state leakage current of the second thin-film transistor T2 and lateral leakage, further improving the stability of the anode voltage.

[0050] For example, assuming that the threshold voltage Vth1 of the light-emitting diode OLED of the target pixel unit is 2V and the cathode voltage ELVSS is -5V, the turn-off voltage needs to satisfy Voff - (-5V) < 2V, that is, Voff < -3V; if the threshold voltage Vth2 of the second thin-film transistor T2 is 1V and the target gray-scale voltage Vdata is 0V, then it needs to satisfy 0V - Voff < 1V, that is, Voff > -1V. Combining the above conditions, the value range of the turn-off voltage Voff is -1V < Voff < -3V, and specific values can be selected according to the actual application scenario, such as -2V, to ensure that both the condition that the light-emitting diode OLED does not emit light and the condition that the second thin-film transistor T2 is turned off are met.

[0051] In this step, since the third thin-film transistor T3 is in the conducting state under the control of the scanning signal, the turn-off voltage can be quickly transmitted to the anode of the light-emitting diode OLED through the detection line and the third thin-film transistor T3.

[0052] To further improve the suppression of lateral leakage current and stabilize the anode voltage of the light-emitting diode (OLED), in an optional embodiment, such as Figure 9 As shown, the pixel driving unit 11 also includes a voltage regulator capacitor C1, which is connected in parallel between the drain and source of the second thin film transistor T2. That is, the first end of the voltage regulator capacitor C1 is connected to the positive voltage terminal ELVDD, and the second end of the voltage regulator capacitor C1 is connected to the anode of the light-emitting diode OLED.

[0053] When the target pixel unit displays a black image, the second thin-film transistor T2 is in the off state. The off-state voltage is transmitted to the anode of the OLED through the detection line and the third thin-film transistor T3. At this time, the voltage regulator capacitor C1 is in the charging state, and the voltage across it is the difference between the positive voltage ELVDD and the off-state voltage. When there is lateral leakage in an adjacent sub-pixel, some holes will migrate to the hole transport layer of the target pixel unit, causing the anode voltage to tend to rise. At this time, the voltage regulator capacitor C1 will release its stored charge to offset the voltage rise caused by the lateral leakage, so that the anode voltage is stabilized at the off-state voltage level. This ensures that the voltage difference between the anode voltage and the cathode voltage ELVSS is always less than the threshold voltage Vth1 of the OLED, thus preventing the OLED from emitting light erroneously.

[0054] To further improve the display effect of the display panel 100 and ensure the normal operation of non-target pixel units, such as green pixel unit G and blue pixel unit B, in an optional embodiment, the driving method of the display panel 100 further includes: S40. During progressive scanning and outputting non-target grayscale voltage or target grayscale voltage to non-target pixel units, the anode voltage of the light-emitting diode (OLED) of the non-target pixel unit is detected or reset via the detection line.

[0055] In this embodiment, to achieve comprehensive monitoring and reset of all pixel units 10, and to avoid display problems caused by malfunctions or lateral leakage of non-target pixel units, the overall display uniformity of the display panel 100 is improved. Specifically, regardless of whether the non-target pixel unit is in a non-black display state or a black display state, the anode voltage of the light-emitting diode (OLED) of the non-target pixel unit is detected or reset through the detection line.

[0056] Among them, the threshold voltage Vth1 of the light-emitting diode OLED of the non-target pixel unit is relatively high and is less affected by lateral leakage. Therefore, in the black display state, there is no need to output a turn-off voltage through the detection line, and it can be turned off only through conventional gray-scale voltage control. However, by detecting the anode voltage of the non-target pixel unit through the detection line, abnormal operation of the non-target pixel unit can be detected in a timely manner, such as drift of the threshold voltage Vth2 of the second thin-film transistor T2, aging of the light-emitting diode OLED, etc., and the abnormality can be eliminated through a reset operation to ensure the normal light emission of the non-target pixel unit and avoid the influence of lateral leakage of the non-target pixel unit on adjacent target pixel units at the same time.

[0057] Furthermore, in order to improve the stability of the anode voltage in the black display state, avoid the interference of the reset voltage on the turn-off voltage, and ensure that the turn-off voltage can effectively suppress lateral leakage, in an optional embodiment, the turn-off voltage is less than the reset voltage when the light-emitting diode OLED is reset. When the non-target gray-scale voltage is output, the reset voltage applied when the detection line resets the anode of the light-emitting diode OLED is usually a fixed low voltage, and its purpose is to quickly clear the residual anode voltage and ensure the accuracy of the detection result. The turn-off voltage is used to stabilize the anode voltage in the black display state and needs to be maintained at a relatively low level. If the turn-off voltage is greater than or equal to the reset voltage, it may cause the anode voltage to be too high, unable to meet the condition of "Voff - ELVSS < Vth1", and then cause the light-emitting diode OLED to emit light erroneously.

[0058] For example, assume that the reset voltage = -3V, the threshold voltage Vth1 of the light-emitting diode OLED of the target pixel unit = 2V, and the cathode voltage ELVSSELVSS = -5V. If the turn-off voltage Voff = 3V, then Voff - ELVSS = 8V > 2V, and the light-emitting diode OLED will be triggered to emit light and the black display cannot be achieved; if the turn-off voltage Voff = 1V, then Voff - ELVSS = 6V > 2V, and the condition is still not met; if the turn-off voltage Voff = -2V, then Voff - ELVSS = 3V > 2V, and it still does not meet the requirement; if the turn-off voltage Voff = -4V, which is less than the reset voltage, then Voff - ELVSS = 1V < 2V, meeting the condition and enabling the black display. Therefore, designing the turn-off voltage to be less than the reset voltage can ensure that the turn-off voltage is at a relatively low level and meet the requirement of suppressing lateral leakage.

[0059] Furthermore, the value of the turn-off voltage can also be flexibly adjusted according to the actual application scenario. For example, when there is a voltage difference between the far end and the near end of the screen, the size of the turn-off voltage can be adjusted to ensure that the target pixel units in each area of the screen can be stably turned off in the black display state, thereby improving the overall display consistency of the display panel 100.

[0060] The following example illustrates the entire working process of the driving method, using a specific timing sequence. Assume the target pixel unit is the red pixel unit R, and the non-target pixel units are the green and blue pixel units B. At the beginning of the frame, the corresponding driving circuit is initialized, residual signals from the previous frame are cleared, and preparation is made to start scanning the new frame.

[0061] During the progressive scan phase, the gate drive circuit 220 outputs a high-level row scan signal to the scan line line by line, starting from the first line. When the nth row scan line is high, the first thin-film transistor T1 and the third thin-film transistor T3 of all pixel units 10 in the nth row are turned on.

[0062] During the grayscale voltage output and detection / reset phase, if a certain column of pixel unit 10 in the nth row is a red pixel unit R and a non-black image needs to be displayed, a non-target grayscale voltage is output to the data line of that column. The voltage is written to the storage capacitor Cst through the first thin-film transistor T1. At the same time, the anode voltage of the light-emitting diode OLED of the pixel unit 10 is detected through the detection line. If an abnormal voltage is detected, a reset operation is performed to clear the abnormal voltage, ensuring that the second thin-film transistor T2 is turned on normally, and the light-emitting diode OLED emits light at the preset brightness.

[0063] If pixel unit 10 in a certain column of row n is a red pixel unit R and a black image needs to be displayed, the target grayscale voltage is output to the data line of that column and written to the storage capacitor Cst through the first thin film transistor T1. At the same time, switch to the shutdown voltage output mode and transmit the shutdown voltage to the anode of the light-emitting diode OLED through the detection line and the third thin film transistor T3. The voltage difference between the anode voltage and the cathode voltage ELVSS is less than the threshold voltage Vth1 of the light-emitting diode OLED, and the voltage difference between the target grayscale voltage and the anode voltage is less than the threshold voltage Vth2 of the second thin film transistor T2. The second thin film transistor T2 is turned off, and the light-emitting diode OLED is turned off.

[0064] If a certain pixel unit 10 in the nth row is a green or blue pixel unit B, regardless of whether it displays a black or non-black image, the corresponding grayscale voltage is output to the data line of that column and written to the storage capacitor Cst through the first thin film transistor T1; at the same time, the OLED anode voltage of the pixel unit 10 is detected or reset through the detection line to ensure its normal operation and avoid abnormal light emission.

[0065] At the end of the frame phase, the scan is completed, and the timing controller 250 outputs a control signal to end the current frame scan and prepare for the next frame scan. This process is repeated to achieve continuous image display.

[0066] Through the aforementioned timing control, the driving method can achieve precise driving and monitoring of all pixel units 10, which not only specifically solves the lateral leakage problem of the target pixel unit, but also ensures the normal operation of non-target pixel units, thus comprehensively ensuring the display quality of the display panel 100.

[0067] The beneficial effects of the present invention embodiments compared with the prior art are as follows: In the above-described driving method of the display panel 100, the corresponding row scanning signal and gray level voltage are first output to the corresponding pixel unit 10 line by line. When outputting a non-target gray level to the target pixel unit, the anode voltage of the light-emitting diode OLED of the target pixel unit is detected or reset by the detection line. When outputting the target gray level voltage to the target pixel unit, the output shutdown voltage is switched to the anode of the light-emitting diode OLED of the target pixel unit. The voltage difference between the shutdown voltage and the cathode voltage ELVSS of the light-emitting diode OLED is less than the threshold voltage Vth1 of the light-emitting diode OLED, thereby ensuring that the light-emitting diode OLED of the target pixel unit is in the off state when the target pixel unit displays a black screen, avoiding the target pixel unit from erroneously emitting light due to lateral leakage of adjacent pixel units 10, and improving the lateral leakage phenomenon.

[0068] Example 2 Corresponding to the above-described display panel 100 and its driving method, such as Figure 8 As shown, a second aspect of the present invention provides a driving circuit 200 for a display panel, the driving circuit 200 for the display panel comprising: The gate driving circuit 220 is connected to the multi-row data lines of the display panel 100. The gate driving circuit 220 is used to control the output of row scanning signals to scan the display panel 100 line by line. The source drive circuit 210 is connected to the multiple rows of data lines of the display panel 100. The source drive circuit 210 is used to controllably output the corresponding target gray level voltage or non-target gray level voltage to the corresponding target pixel unit or non-target pixel unit. Multiple mode switching circuits 230 are respectively connected to the detection lines of multiple target pixel units. The mode switching circuits 230 are used to detect or reset the anode voltage of the light-emitting diode (OLED) of the target pixel unit according to the first control signal, or to output a shutdown voltage to the target pixel unit according to the second control signal. Multiple first detection and reset circuits 240 are respectively connected to the detection lines of multiple non-target pixel units. The first detection and reset circuits 240 are used to detect or reset the anode voltage of the light-emitting diode (OLED) of the non-target pixel unit. The timing controller 250 is connected to the gate drive circuit 220, the source drive circuit 210 and the mode switching circuit 230 respectively. The timing controller 250 is used to output corresponding control signals to control the gate drive circuit 220, the source drive circuit 210 and the mode switching circuit 230 to implement the above-mentioned driving method of the display panel 100.

[0069] In this embodiment, the gate driving circuit 220 is connected to multiple scan lines of the display panel 100. The gate driving circuit 220 outputs a row scanning signal under control, scanning the pixel units 10 of the display panel 100 line by line, and controlling the first thin-film transistor T1 and the third thin-film transistor T3 of the corresponding row pixel unit 10 to turn on and off, thereby realizing line-by-line addressing. The gate driving circuit 220 can adopt a shift register architecture in the prior art, such as the GOA (Gate On Array) architecture, integrating the gate driving circuit 220 on the substrate of the display panel 100, reducing the number of external chips, improving integration, and reducing costs; alternatively, an external gate driving chip can be used, which can be flexibly selected according to the size and resolution of the display panel 100.

[0070] The operating state of the gate drive circuit 220 is controlled by the timing controller 250. The timing controller 250 outputs gate control signals, such as scan clock signals, start signals, and reset signals, to control the gate drive circuit 220 to output high-level line scan signals line by line according to a preset timing sequence, ensuring the accuracy and synchronization of the scan.

[0071] The source driver circuit 210 is connected to multiple rows of data lines on the display panel 100. The source driver circuit 210 outputs a target grayscale voltage or a non-target grayscale voltage to the corresponding target pixel unit or non-target pixel unit, achieving precise writing of the grayscale voltage. The source driver circuit 210 typically includes a digital-to-analog converter module, a buffer module, and an output module. The digital-to-analog converter module converts the digital grayscale signal output by the timing controller 250 into an analog grayscale voltage. The buffer module buffers and amplifies the grayscale voltage, and the output module transmits the grayscale voltage to the corresponding row of data lines.

[0072] The operating state of the source drive circuit 210 is also controlled by the timing controller 250. The timing controller 250 outputs source control signals, such as data clock signals and latch signals, to control the source drive circuit 210 and the gate drive circuit 220 to work synchronously, so as to ensure that the gray level voltage can be accurately written into the storage capacitor Cst when the first thin film transistor T1 of the corresponding row pixel unit 10 is turned on.

[0073] Multiple mode switching circuits 230 are connected to the detection lines of multiple target pixel units respectively. That is, each detection line corresponding to a target pixel unit is connected to a mode switching circuit 230. The mode switching circuit 230 realizes the switching between two working modes according to the control signal output by the timing controller 250. It detects or resets the anode voltage of the light-emitting diode (OLED) of the target pixel unit according to the first control signal; or outputs a shutdown voltage to the anode of the light-emitting diode (OLED) of the target pixel unit according to the second control signal.

[0074] The first detection and reset circuit 240 is connected to the detection lines of multiple non-target pixel units respectively. That is, the detection lines corresponding to all non-target pixel units are connected to the first detection and reset circuit 240. Its core function is to detect or reset the anode voltage of the light-emitting diode OLED of the non-target pixel unit. Regardless of whether the non-target pixel unit is in a non-black display state or a black display state, the anode voltage can be monitored and reset to ensure the normal operation of the non-target pixel unit.

[0075] The structure of the first detection and reset circuit 240 can adopt the conventional detection and reset circuit in the prior art, including a detection module and a reset module. The detection module is used to collect the anode voltage signal and transmit it to the timing controller 250, and the reset module is used to output the reset voltage to clear the residual anode voltage. Its working state is controlled by the timing controller 250 and works synchronously with the gate drive circuit 220 and the source drive circuit 210.

[0076] The timing controller 250 is connected to the gate drive circuit 220, the source drive circuit 210, the multiple mode switching circuit 230 and the first detection and reset circuit 240 respectively. It is the control core of the entire display panel drive circuit 200. Its core function is to output corresponding control signals to control the coordinated work of each module and realize the drive method of the display panel 100 as described above.

[0077] The timing controller 250 mainly functions to generate gate control signals to control the gate drive circuit 220 to output line scan signals line by line; generate source control signals to control the source drive circuit 210 to output corresponding grayscale voltages; generate first control signals and second control signals to control the mode switching circuit 230 to switch operating modes and realize detection / reset or shutdown voltage output; generate detection / reset control signals to control the first detection / reset circuit 240 to detect and reset non-target pixel units; receive the anode voltage detection signals transmitted by the mode switching circuit 230 and the first detection / reset circuit 240, analyze and process them, and if an abnormality is found, output a calibration signal to adjust the grayscale voltage or shutdown voltage to ensure display quality.

[0078] The timing controller 250 can be a dedicated TCON chip or integrated into the source driver chip, depending on the integration requirements of the display panel's drive circuit 200. Its control logic can be implemented through hardware circuits or configured through software programs to ensure the flexibility and accuracy of control.

[0079] In this embodiment, the driving circuit 200 of the display panel can accurately execute the various control logics of the driving method through the synergistic effect of the above modules, realize differentiated driving and monitoring of target pixel units and non-target pixel units, and specifically solve the problem of lateral leakage.

[0080] The mode switching circuit 230 may include a corresponding detection unit and a voltage output unit. In an optional embodiment, such as... Figure 9 As shown, the mode switching circuit 230 includes: The second detection and reset circuit 231 is used to detect or reset the anode voltage of the light-emitting diode (OLED) of the target pixel unit; The shutdown voltage output circuit 232 is used to output the shutdown voltage; The switch switching circuit 233 is connected to the detection line corresponding to the target pixel unit, the second detection reset circuit 231, and the shutdown voltage output circuit 232, respectively. The switch switching circuit 233 is used to connect the second detection reset circuit 231 and the detection line corresponding to the target pixel unit according to the first control signal, or to switch the connection between the shutdown voltage output circuit 232 and the detection line corresponding to the target pixel unit according to the second control signal.

[0081] In this embodiment, the second detection and reset circuit 231 is used to detect or reset the anode voltage of the light-emitting diode (OLED) of the target pixel unit. Similar in structure to the first detection and reset circuit 240, it may include a detection module and a reset module. The detection module is used to collect the anode voltage signal of the light-emitting diode (OLED) of the target pixel unit, convert it into an electrical signal that can be recognized by the timing controller 250, and transmit it to the timing controller 250 for analysis and processing to determine whether the anode voltage is normal, and then adjust the control strategy. The detection module typically includes a voltage acquisition circuit, a signal amplification circuit, a filtering circuit, etc., to ensure that the acquired voltage signal is accurate and stable and to avoid interference.

[0082] The reset module is used to output a reset voltage. Under the control of the timing controller 250, it resets the anode of the light-emitting diode (OLED) of the target pixel unit, clears the residual voltage of the anode, and ensures the accurate writing of grayscale voltage and the accuracy of detection results. The reset module usually includes a reset voltage source and a buffer circuit. The magnitude of the reset voltage can be preset according to the characteristics of the light-emitting diode (OLED) and is greater than the turn-off voltage.

[0083] The shutdown voltage output circuit 232 is used to output a shutdown voltage. This shutdown voltage must satisfy the following conditions: the voltage difference between the shutdown voltage and the cathode voltage ELVSS of the light-emitting diode (OLED) is less than the threshold voltage Vth1 of the OLED, and less than the reset voltage.

[0084] The switch switching circuit 233 is connected to the detection line corresponding to the target pixel unit, the second detection reset circuit 231, and the shutdown voltage output circuit 232 respectively. Its core function is to switch between the detection reset circuit and the shutdown voltage output circuit 232 according to the control signal output by the timing controller 250.

[0085] When the timing controller 250 outputs the first control signal, the switch switching circuit 233 connects the second detection and reset circuit 231 and the detection line corresponding to the target pixel unit. At this time, the mode switching circuit 230 is in the detection / reset mode. The detection and reset circuit detects or resets the anode voltage of the light-emitting diode OLED of the target pixel unit through the detection line.

[0086] When the timing controller 250 outputs the second control signal, the switch switching circuit 233 switches the connection between the shutdown voltage output circuit 232 and the detection line corresponding to the target pixel unit. At this time, the mode switching circuit 230 is in the shutdown voltage output mode, and the shutdown voltage output circuit 232 transmits the shutdown voltage to the anode of the light-emitting diode OLED of the target pixel unit through the detection line.

[0087] The switching circuit 233 can be a single-pole double-throw switch SW1 or a transistor switching circuit, etc. The operating state of the switching circuit 233 is precisely controlled by the timing controller 250 and synchronized with the operating timing of the gate drive circuit 220 and the source drive circuit 210 to ensure the accuracy of the switching timing and the smooth execution of the drive logic.

[0088] For example, when the scan line of the target pixel unit is at a high level, the first thin-film transistor T1 and the third thin-film transistor T3 are turned on, and a non-black screen needs to be displayed, the timing controller 250 outputs a first control signal, and the switch switching circuit 233 connects the second detection and reset circuit 231 with the detection line. The second detection and reset circuit 231 detects or resets the anode voltage of the light-emitting diode OLED.

[0089] When a black screen is required, the timing controller 250 outputs a second control signal. The switch switching circuit 233 disconnects the second detection reset circuit 231 from the detection line, while simultaneously connecting the shutdown voltage output circuit 232 to the detection line. The shutdown voltage is rapidly transmitted to the anode of the OLED through the detection line and the third thin-film transistor T3, achieving stable control of the anode voltage. The switching response time of the switch switching circuit 233 matches the scanning timing to ensure synchronization with the conduction states of the first thin-film transistor T1 and the third thin-film transistor T3, avoiding signal conflicts or delays, thereby ensuring the display effect.

[0090] The voltage output shutdown circuit 232 can employ a corresponding voltage output unit and a buffer unit. In an optional embodiment, such as... Figure 10 As shown, the shutdown voltage output circuit 232 includes: The voltage selection circuit 201 is connected to the timing controller 250. The voltage selection circuit 201 is used to select the corresponding magnitude of the turn-off voltage according to the selection control signal of the timing controller 250. Voltage follower U1 is connected between switch switching circuit 233 and voltage selection circuit 201. Voltage follower U1 is used to perform impedance transformation on the turn-off voltage output by voltage selection circuit 201 and output it.

[0091] In this embodiment, the voltage selection circuit 201 can realize the selective output of the turn-off voltage, and the voltage follower U1 is used to buffer and amplify the turn-off voltage before outputting it to the switch switching circuit 233.

[0092] Among them, the voltage selection circuit 201 serves as the output source of the shutdown voltage. The voltage difference between its output shutdown voltage and the cathode voltage ELVSS of the light-emitting diode OLED is less than the threshold voltage Vth1 of the light-emitting diode OLED, and the shutdown voltage is less than the reset voltage. It also has stable voltage output characteristics to avoid abnormal anode voltage caused by voltage fluctuations. The voltage selection circuit 201 can select the corresponding size of the shutdown voltage according to the selection control signal to meet the display panel 100 with different structures and requirements. It can adjust the size of the shutdown voltage according to actual needs, thereby improving versatility and application scenarios.

[0093] The voltage follower U1 has the characteristics of high input impedance and low output impedance, which can realize buffer amplification of the turn-off voltage, improve the driving capability of the turn-off voltage, reduce the influence of line resistance on voltage, ensure that the turn-off voltage can be accurately and stably transmitted to the anode of the light-emitting diode OLED, and at the same time improve the output current capability to meet the requirements of anode voltage stability control.

[0094] Meanwhile, the shutdown voltage output circuit 232 can also be equipped with a filter capacitor C2. The first end of the filter capacitor C2 is connected to the output end of the voltage follower U1, and the second end of the filter capacitor C2 is grounded. The filter capacitor C2 is used to filter out high-frequency noise in the shutdown voltage, further improve the stability of the shutdown voltage, and avoid noise causing fluctuations in the anode voltage of the light-emitting diode OLED.

[0095] The voltage selection circuit 201 can be a corresponding voltage source 21 and a selection circuit. In an optional embodiment, such as... Figure 10 As shown, the voltage selection circuit 201 includes: Multiple voltage sources 21 are used to output turn-off voltages of different magnitudes respectively; Selector switch SW2 is connected to multiple voltage sources 21 and voltage follower U1 respectively. Selector switch SW2 is used to switch the output of different shutdown voltages to voltage follower U1 according to the selection control signal.

[0096] In this embodiment, different voltage sources 21 are used to output different levels of turn-off voltage. At the same time, multiple voltage sources 21 are connected to voltage follower U1 through a selection switch SW2. The selection switch SW2 includes multiple first terminals and a second terminal. The multiple first terminals are respectively connected to multiple voltage sources 21, and the second terminal of the selection switch SW2 is connected to the anode of voltage follower U1. When the selection switch SW2 receives different selection control signals, it switches between different voltage sources 21 and voltage follower U1, thereby selecting to output different levels of turn-off voltage to voltage follower U1.

[0097] Example 3 Corresponding to the display panel 100 and the driving circuit 200 of the display panel described above, a third aspect of the present invention provides a display device including a display panel 100 and a driving circuit 200 of the display panel. The specific structures of the driving circuit 200 of the display panel and the display panel 100 are as described in the above embodiments. Since this display device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The driving circuit 200 of the display panel is connected to the display panel 100.

[0098] The display device may also include other necessary auxiliary modules, such as power supply modules, control modules, interface modules, etc. The auxiliary modules work together to ensure the normal operation of the display device.

[0099] The power supply module is connected to the display panel 100 and the driving circuit respectively, providing the display panel 100 with working voltages such as positive voltage ELVDD and cathode voltage ELVSS, and providing the driving circuit with gate drive voltage, source drive voltage, turn-off voltage, and reset voltage, ensuring that each module works normally. The power supply module can use DC power supply, AC power adapter, etc., and has a stable voltage output function to avoid voltage fluctuations affecting the display effect.

[0100] The control module is connected to the timing controller 250 and is used to receive externally input image signals and transmit them to the timing controller 250. The timing controller 250 generates corresponding control signals according to the image signals to control the drive circuit and the display panel 100 to output corresponding images. The control module can also be used to receive user input operation commands and transmit them to the timing controller 250 to adjust the display parameters.

[0101] The interface module is used to connect the display device to external devices, receive external input image signals, control signals and power signals, such as HDMI interface, USB interface, DisplayPort interface, etc., to improve the versatility and expandability of the display device.

[0102] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A driving method for a display panel, the display panel comprising multiple rows of scan lines, multiple columns of data lines, multiple columns of detection lines, and multiple pixel units arranged in an array, characterized in that, The pixel unit includes a pixel driving unit and a light-emitting diode. The pixel unit is divided into a red pixel unit, a blue pixel unit and a green pixel unit. The light-emitting diodes of multiple pixel units are connected to a common cathode. The pixel driving unit is connected to the anode of the corresponding light-emitting diode. Each pixel driving unit is connected to a scan line, a data line and a detection line respectively. The driving method for the display panel includes: Output the corresponding row scan signal and grayscale voltage to the corresponding pixel unit line by line; When outputting a non-target grayscale voltage to the target pixel unit, the anode voltage of the light-emitting diode of the target pixel unit is detected or reset through the detection line. The target pixel unit is one of the red pixel unit, blue pixel unit and green pixel unit, and the threshold voltage of the light-emitting diode of the target pixel unit is less than the threshold voltage of the light-emitting diode of the other two pixel units. When outputting the target grayscale voltage to the target pixel unit, the output shutdown voltage is switched to the detection line and transmitted to the anode of the light-emitting diode of the target pixel unit. The voltage difference between the shutdown voltage and the cathode voltage of the light-emitting diode is less than the threshold voltage of the corresponding light-emitting diode. The target grayscale voltage is the grayscale voltage corresponding to the pixel unit displaying a black image.

2. The driving method for the display panel as described in claim 1, characterized in that, The driving method for the display panel further includes: During line-by-line scanning and outputting the non-target grayscale voltage or the target grayscale voltage to the non-target pixel unit, the anode voltage of the light-emitting diode of the non-target pixel unit is detected or reset via the detection line.

3. The driving method for the display panel as described in claim 1, characterized in that, The turn-off voltage is less than the reset voltage when the light-emitting diode is reset.

4. The driving method for the display panel as described in claim 1, characterized in that, The pixel driving unit includes a first thin-film transistor, a second thin-film transistor, a third thin-film transistor, and a storage capacitor; The drain of the first thin-film transistor is connected to the data line; the source of the first thin-film transistor, the gate of the second thin-film transistor, and the first terminal of the storage capacitor are connected; the second terminal of the storage capacitor, the drain of the second thin-film transistor, and the positive voltage terminal are connected; the source of the second thin-film transistor, the drain of the third thin-film transistor, and the anode of the light-emitting diode are connected; the source of the third thin-film transistor is connected to the detection line; and the gates of the first thin-film transistor and the third thin-film transistor are connected to the scan line. The voltage difference between the target grayscale voltage and the turn-off voltage is less than the threshold voltage of the second thin-film transistor.

5. A driving circuit for a display panel, the display panel comprising multiple rows of scan lines, multiple columns of data lines, multiple columns of detection lines, and multiple pixel units arranged in an array, characterized in that, The pixel unit includes a pixel driving unit and a light-emitting diode. The pixel unit is divided into a red pixel unit, a blue pixel unit and a green pixel unit. The light-emitting diodes of multiple pixel units are connected to a common cathode. The pixel driving unit is connected to the anode of the corresponding light-emitting diode. Each pixel driving unit is connected to a scan line, a data line and a detection line respectively. The driving circuit of the display panel includes: A gate driving circuit is connected to multiple rows of data lines of the display panel. The gate driving circuit is used to output a controlled row scanning signal to scan the display panel row by row. The source driving circuit is connected to multiple rows of data lines of the display panel. The source driving circuit is used to output the corresponding target gray level voltage or non-target gray level voltage to the corresponding target pixel unit or non-target pixel unit in a controlled manner. Multiple mode switching circuits are respectively connected to the detection lines of multiple target pixel units. The mode switching circuits are used to detect or reset the anode voltage of the light-emitting diode of the target pixel unit according to the first control signal, or to output a shutdown voltage to the target pixel unit according to the second control signal. Multiple first detection and reset circuits are respectively connected to the detection lines of multiple non-target pixel units. The first detection and reset circuits are used to detect or reset the anode voltage of the light-emitting diode of the non-target pixel unit. A timing controller is connected to the gate driving circuit, the source driving circuit, and the mode switching circuit, respectively. The timing controller is used to output corresponding control signals to control the gate driving circuit, the source driving circuit, and the mode switching circuit to implement the display panel driving method as described in any one of claims 1 to 4.

6. The driving circuit for the display panel as described in claim 5, characterized in that, The mode switching circuit includes: The second detection and reset circuit is used to detect or reset the anode voltage of the light-emitting diode of the target pixel unit; Shutdown voltage output circuit, used to output shutdown voltage; A switching circuit is connected to the detection line corresponding to the target pixel unit, the second detection reset circuit, and the shutdown voltage output circuit, respectively. The switching circuit is used to connect the second detection reset circuit and the detection line corresponding to the target pixel unit according to the first control signal, or to switch the connection between the shutdown voltage output circuit and the detection line corresponding to the target pixel unit according to the second control signal.

7. The driving circuit for the display panel as described in claim 6, characterized in that, The shutdown voltage output circuit includes: A voltage selection circuit is connected to the timing controller. The voltage selection circuit is used to select and output a corresponding turn-off voltage according to the selection control signal of the timing controller. A voltage follower is connected between the switching circuit and the voltage selection circuit. The voltage follower is used to perform impedance transformation on the turn-off voltage output by the voltage selection circuit and then output it.

8. The driving circuit for the display panel as described in claim 7, characterized in that, The voltage selection circuit includes: Multiple voltage sources are used to output different levels of turn-off voltage. The selector switch is connected to multiple voltage sources and voltage followers respectively. The selector switch is used to switch the output of different shutdown voltages to the voltage followers according to the selection control signal.

9. A display device, characterized in that, It includes a display panel and a driving circuit for the display panel as described in any one of claims 5 to 8, wherein the driving circuit for the display panel is connected to the display panel; The display panel includes multiple rows of scan lines, multiple columns of data lines, multiple columns of detection lines, and multiple pixel units arranged in an array. Each pixel unit includes a pixel driving unit and a light-emitting diode (LED). The pixel units are divided into red pixel units, blue pixel units, and green pixel units. The LEDs of multiple pixel units are connected to a common cathode. The pixel driving unit is connected to the anode of the corresponding LED. Each pixel driving unit is connected to one scan line, one data line, and one detection line.

10. The display device as claimed in claim 9, characterized in that, The pixel driving unit includes a first thin-film transistor, a second thin-film transistor, a third thin-film transistor, and a storage capacitor; The drain of the first thin-film transistor is connected to the data line; the source of the first thin-film transistor, the gate of the second thin-film transistor, and the first terminal of the storage capacitor are connected; the second terminal of the storage capacitor, the drain of the second thin-film transistor, and the positive voltage terminal are connected; the source of the second thin-film transistor, the drain of the third thin-film transistor, and the anode of the light-emitting diode are connected; the source of the third thin-film transistor is connected to the detection line; and the gates of the first thin-film transistor and the third thin-film transistor are connected to the scan line. The pixel driving unit further includes a voltage-regulating capacitor connected in parallel between the drain and source of the second thin-film transistor.

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