Repair method and repair device for display panel

Abstract

A repair method of a display panel is provided. The method comprises the following steps: providing a display panel; acquiring position coordinates of bright spots in the display panel; according to the position coordinates of the bright spots, calculating pixel rows where pixels in the bright spots are located, and expanding the pixel rows obtained through calculation to obtain expanded pixel rows; and inputting aging signals to data lines in the display panel, so that effective signals in the aging signals are input to pixels in the expanded pixel rows only when the expanded pixel rows are scanned.

Description

Technical Field

[0001] The present invention relates to display technology, and in particular to a display panel repair method and repair device. Background Art

[0002] The complexity of OLED driving circuits results in a low yield rate. Among the many defects of OLED products, bright spot defects always account for the largest proportion.

[0003] When there are too many bright pixels, or the position coordinates of the bright pixels exceed the specifications required by the customer, the OLED product will be directly scrapped, resulting in a loss of yield. When there are fewer bright pixels, the bright spots can be repaired into dark spots by laser burning to improve the yield.

[0004] However, the current customer specifications are becoming more and more stringent, and customers do not accept dark spots. Therefore, laser burning can no longer meet customer requirements. Summary of the invention

[0005] On the one hand, the present disclosure provides a method for repairing a display panel, comprising: providing a display panel; obtaining the position coordinates of a bright spot in the display panel; calculating the pixel row where the pixels in the bright spot are located according to the position coordinates of the bright spot, and expanding the calculated pixel row to obtain an expanded pixel row; and inputting an aging signal to a data line in the display panel, so that only when the expanded pixel row is scanned, a valid signal in the aging signal is input to the pixels in the expanded pixel row.

[0006] Optionally, obtaining the position coordinates of the bright spot in the display panel includes: lighting up the display panel; taking a photo of the lit display panel; and performing image processing on the photo of the lit display panel to obtain the position coordinates of the bright spot.

[0007] Optionally, calculating the pixel row where the pixel in the bright spot is located according to the position coordinates of the bright spot includes: converting the position coordinates of the bright spot into the pixel row according to the following formula: Among them, T 亮点 is the pixel row where the pixel in the bright spot is located; N is the total number of pixel rows in the display panel; L 总 is the total length of the effective area of ​​the display panel along the direction of pixel row arrangement; Y1 is the coordinate of the bright spot in the extension direction of the data line.

[0008] Optionally, expanding the calculated pixel rows includes: expanding the calculated pixel rows forward and backward by a predetermined number of pixel rows respectively, so that the time for scanning all the expanded pixel rows reaches millisecond level.

[0009] Optionally, an aging signal is input to the data line in the display panel so that only when the extended pixel row is scanned, the valid signal in the aging signal is input to the pixel in the extended pixel row, including: loading a frame start signal and a clock signal to the gate drive circuit through a gate pad, so that the gate drive circuit outputs a scanning signal to the gate line row by row; and simultaneously loading the aging signal to the data line through a data pad, wherein the aging signal is a valid signal only when the extended pixel row is scanned.

[0010] Optionally, an aging signal is input to the data line in the display panel so that only when the extended pixel row is scanned, the valid signal in the aging signal is input to the pixel in the extended pixel row, including: loading a frame start signal and a clock signal to the gate drive circuit through a gate pad, so that the gate drive circuit outputs a scanning signal to the gate line row by row; transmitting a gate line selection signal to the selection transistor through the gate pad, so that only when the extended pixel row is scanned, the gate line selection signal is at a valid level; and simultaneously loading the aging signal to the data line through the data pad, wherein the aging signal is a valid signal during one frame of image.

[0011] Optionally, the method also includes: lighting up the display panel again and detecting whether there is a bright spot, and if the bright spot still exists, then: obtaining the position coordinates of the bright spot in the display panel again; calculating the pixel row where the pixel in the bright spot is located according to the position coordinates of the bright spot, and expanding the calculated pixel row to obtain an expanded pixel row; and inputting the aging signal to the data line in the display panel again, so that only when the expanded pixel row is scanned, the valid signal in the aging signal is input to the pixels in the expanded pixel row, wherein the level of the valid signal of the aging signal input again is greater than the level of the valid signal of the aging signal input last time.

[0012] Optionally, the level of the valid signal of the aging signal input again is 2V to 4V higher than the level of the valid signal of the aging signal input last time.

[0013] Optionally, the level of the valid signal of the aging signal input again is 3V higher than the level of the valid signal of the aging signal input last time.

[0014] On the other hand, the present disclosure provides a display panel repair device, comprising: an optical detection device, which is configured to obtain the position coordinates of a bright spot in the display panel; a calculation device, which is configured to calculate the pixel row where the pixels in the bright spot are located according to the position coordinates of the bright spot, and expand the calculated pixel row to obtain an expanded pixel row; and an aging device, which is configured to input an aging signal to the data line in the display panel, so that only when the expanded pixel row is scanned, the valid signal in the aging signal is input to the pixels in the expanded pixel row. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] According to various disclosed embodiments, the following drawings are examples only for illustration purposes and are not intended to limit the scope of the present invention.

[0016] Figure 1 A schematic diagram showing the structure of a display panel according to some embodiments of the present disclosure.

[0017] Figure 2 is a schematic diagram showing the structure of a gate driving circuit in some embodiments of the present disclosure.

[0018] Figure 3 Various signals in a method for repairing a display panel according to some embodiments of the present disclosure are shown.

[0019] Figure 4 This is a comparison chart of the TFT characteristic line curves before and after aging of the display panel.

[0020] Figure 5 is a schematic diagram illustrating a method for repairing a display panel according to some embodiments of the present disclosure.

[0021] Figure 6 is a schematic diagram illustrating a method for obtaining position coordinates of a bright spot in a display panel according to some embodiments of the present disclosure.

[0022] Figure 7 is a schematic diagram illustrating a method for determining an extended pixel row according to some embodiments of the present disclosure.

[0023] Figure 8 These are various signals in a method for repairing a display panel in some embodiments of the present disclosure.

[0024] Fig. 9 A schematic diagram showing the structure of a display panel according to some embodiments of the present disclosure.

[0025] Fig.10 These are various signals in a method for repairing a display panel in some embodiments of the present disclosure.

[0026] Fig.11 is a schematic diagram showing the structure of a display panel repair device according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0027] The present disclosure will now be described in more detail with reference to the following examples. It should be noted that the following description of some of the embodiments presented herein is for illustration and description purposes only. It is not intended to be exhaustive or limited to the precise form disclosed.

[0028] The reasons for bright spots in OLED devices include the following two aspects: on the one hand, particles or residues cause pixel switches to fail, and the pixels are always on when powered on, thus forming bright spots; on the other hand, the characteristics of some thin-film transistors (TFTs) cause characteristic tails to appear within the operating voltage range, thus forming bright spots. For bright spots caused by the second reason, the present disclosure provides a display panel repair method that substantially eliminates one or more problems caused by the limitations and shortcomings of the prior art.

[0029] Figure 1 Schematic diagram showing the structure of a display panel in some embodiments of the present disclosure. Figure 1 In some embodiments, the display panel includes N gate lines (e.g., G1, G2, G3, ..., GN) and M data lines (e.g., D1, D2, D3, ..., DM). In some embodiments, N and M are positive integers. In a specific example, N=480 and M=2400. In some embodiments, the display panel includes a plurality of sub-pixels Sp arranged in N rows and M columns. Each sub-pixel in the plurality of sub-pixels Sp is connected to one of the N gate lines and to one of the M data lines. In a specific example, sub-pixels in the same column have the same color. For example, red sub-pixels, green sub-pixels, and blue sub-pixels are alternately arranged in M ​​columns of sub-pixels. Figure 1 The display panel shown in has a resolution of M×N. The display panel includes a data pad DPD for transmitting data signals to M data lines. The display panel includes a gate drive circuit GOA, which is used to generate a gate signal output to N gate lines. The display panel also includes a gate pad GPD for transmitting a frame start signal STV and a clock signal CLK to the gate drive circuit GOA.

[0030] Figure 2 is a schematic diagram showing the structure of a gate driving circuit in some embodiments of the present disclosure. Figure 2 In some embodiments, the gate driving circuit includes N stages. Each of the N stages includes a corresponding scanning unit. Figure 2 As shown, the gate driving circuit includes a first scanning unit, a second scanning unit, a third scanning unit, a fourth scanning unit, ..., and an Nth scanning unit. The N scanning units are configured to provide N control signals (for example, gate scanning signals, reset control signals, or light emitting control signals) to N rows of sub-pixels. Figure 2In , N control signals are represented as Output1, Output2, Output3, Output4, ..., OutputN. The nth scanning unit is configured to receive a frame start signal STV or an output signal from an output terminal of a previous scanning unit (e.g., the (n-1)th scanning unit). Figure 2 In the embodiment, the first scanning unit is configured to receive the frame start signal STV as an input signal, the second scanning unit is configured to receive the output signal from the first scanning unit as an input signal Input2, the third scanning unit is configured to receive the output signal from the second scanning unit as an input signal Input3, the fourth scanning unit is configured to receive the output signal from the third scanning unit as an input signal Input4, and the Nth scanning unit is configured to receive the output signal from the (N-1)th scanning unit as an input signal InputN.

[0031] Reference Figure 2 , the nth scanning unit is configured to receive an output signal from a subsequent scanning unit (eg, the (n+1)th scanning unit) as a reset signal. Figure 2 In the embodiment, the first scanning unit is configured to receive the output signal from the second scanning unit as a reset signal Reset1, the second scanning unit is configured to receive the output signal from the third scanning unit as a reset signal Reset2, the third scanning unit is configured to receive the output signal from the fourth scanning unit as a reset signal Reset3, and the fourth scanning unit is configured to receive the output signal from the fifth scanning unit as a reset signal Reset4.

[0032] Figure 3 1 shows various signals in a method for repairing a display panel according to some embodiments of the present disclosure. Figure 1 and Figure 3 As shown, in some embodiments, the repair method of the display panel includes: loading a frame start signal STV, clock signals CLK1 and CLK2 to the gate driving circuit GOA through the gate pad GPD, and loading an aging signal VD to M data lines simultaneously through the data pad DPD. The effective level of the aging signal VD needs to be determined according to the process parameters of the display panel, for example, it is usually greater than 13V for a mobile phone panel and is usually greater than 17V for a tablet computer panel.

[0033] The aging of the display panel refers to the process of making the display panel work continuously or periodically for a long time before the display panel leaves the factory, so that various performance parameters of the display panel reach stability. As used in this article, the "aging signal" refers to the signal loaded during the aging process of the display panel. As used in this article, the "effective signal in the aging signal" is the signal that enables the display panel to actually work.

[0034] As used herein, a "gate pad" refers to a component in a display panel that connects a gate drive circuit GOA to an external integrated circuit (e.g., a flexible printed circuit). The "gate pad" is usually made of a metal film layer of a display panel and is exposed from the display panel to bind an external integrated circuit (e.g., a flexible printed circuit).

[0035] As used herein, a "data pad" refers to a component in a display panel that connects a data line to an external integrated circuit (e.g., a flexible printed circuit). The "data pad" is usually made of a metal film layer of the display panel and is exposed from the display panel to bind the external integrated circuit (e.g., a flexible printed circuit).

[0036] like Figure 1 As shown, the display panel includes a display area AA and a binding area BA, and the binding area BA is located on one side of the display area AA. The gate pad GPD and the data pad DPD are located in the binding area AA, and are connected to an external circuit through the gate pad GPD and the data pad DPD to input gate signals and data signals.

[0037] Figure 4 This is a comparison of the TFT characteristic curves before and after aging of the display panel. Figure 4 As shown in the dashed box Z1 in FIG. 1 , before the display panel is aged, the characteristic curves of some TFTs have a tail-lift phenomenon within the operating voltage range of 5V to 10V, thereby forming bright spots in the display panel. Figure 4 As shown, after the display panel is aged, the tailing phenomenon of the characteristic curve of the TFT is effectively eliminated. This is because when the aging signal is loaded, the large voltage applied improves the interface defects of the TFT, thereby improving the characteristic curve of the TFT.

[0038] However, if Figure 4 As shown in the dotted box Z2 in FIG. 1 , after the display panel is aged, the threshold voltage of the TFT may drift. Figure 4 As shown in FIG. 1 , after the display panel is aged, the characteristic curve of the TFT shifts positively. Figure 3 The electrical signal shown in the figure shows that the TFTs of all pixels in the entire display panel will undergo an aging process. Although this eliminates the tailing phenomenon of the characteristic curve of abnormal TFTs, it will aggravate the positive drift of the threshold voltage for TFTs whose characteristic curves already have a positive shift, thus forming new bright spots.

[0039] To this end, the present disclosure provides a display panel repair method, which substantially eliminates one or more problems caused by the limitations and disadvantages of the prior art. The method includes: providing a display panel; obtaining the position coordinates of a bright spot in the display panel; calculating the pixel row where the pixel in the bright spot is located according to the position coordinates of the bright spot, and expanding the calculated pixel row to obtain an expanded pixel row; and inputting an aging signal to a data line in the display panel, so that only when the expanded pixel row is scanned, the valid signal in the aging signal is input to the pixel in the expanded pixel row.

[0040] Figure 5 is a schematic diagram illustrating a method for repairing a display panel according to some embodiments of the present disclosure. Figure 5 As shown, in some embodiments, a method for repairing a display panel includes: providing a display panel; obtaining the position coordinates of a bright spot in the display panel; calculating the pixel row where the pixels in the bright spot are located according to the position coordinates of the bright spot; expanding the calculated pixel row to obtain an expanded pixel row; generating an expanded pixel row scanning signal and an aging signal; loading the expanded pixel row scanning signal and the aging signal into the display panel to age the display panel.

[0041] Figure 6 is a schematic diagram illustrating a method for obtaining the position coordinates of a bright spot in a display panel according to some embodiments of the present disclosure. Figure 6 In some embodiments, in order to obtain the position coordinates of the bright spot in the display panel in the effective display area AA, the display panel is first lit. Then, an optical detection device is used to take a photo of the lit display panel. The photo of the lit display panel is image processed to lock the position coordinates (X1, Y1) of the bright spot. Figure 6 As shown, the X direction is the width direction of the display panel, that is, the extension direction of the gate lines; the Y direction is the length direction of the display panel, that is, the extension direction of the data lines, that is, the arrangement direction of the pixel rows.

[0042] Figure 7 is a schematic diagram illustrating a method for determining an extended pixel row according to some embodiments of the present disclosure. Figure 7 In some embodiments, the method for determining the expanded pixel row includes: calculating the pixel row where the pixels in the bright spot are located according to the position coordinates of the bright spot, and expanding the calculated pixel row to obtain the expanded pixel row. Specifically, the position coordinates (X1, Y1) of the bright spot are converted into the pixel row through an algorithm, and the calculation method is as follows:

[0043]

[0044] Among them, T 亮点 is the pixel row where the pixel in the bright spot is located; N is the total number of pixel rows in the display panel, that is, the total number of gate lines; L总 is the total length of the effective area of ​​the display panel along the Y direction; Y1 is the coordinate of the bright spot in the Y direction.

[0045] However, the accuracy of the automatic optical detection device is not enough to ensure that the pixel row obtained by the above calculation is the real pixel row where the bright spot is located. Therefore, in some embodiments, the pixel row obtained by the above calculation needs to be expanded to obtain an expanded pixel row. The principle of the expansion method is as follows: the pixel row obtained by the above calculation is expanded forward and backward by a predetermined number of pixel rows respectively, so that the time to scan all the expanded pixel rows reaches the millisecond level.

[0046] The above method is described below by using a specific example.

[0047] Example 1: The product resolution is 1080×2412, the length of the product is 155.33 mm, the position coordinates of the pixels in the bright spot are (33.33, 36.44), and the scanning time of one frame of image is 8309.6 μs.

[0048] According to the above calculation formula, the pixel row where the pixel in the bright spot is located can be obtained:

[0049]

[0050] The calculated bright spot position occurs at row 565. Due to the accuracy of the device, the calculated pixel row is extended 100 rows forward and backward respectively (so that the time to scan all extended pixel rows reaches milliseconds) to determine the extended pixel row. That is, the aging signal will be applied to the pixels at rows 465 to 665 later.

[0051] Figure 8 are various signals in the display panel repair method according to some embodiments of the present disclosure. Figure 1 and Figure 8As shown, in some embodiments, the repair method of the display panel includes: loading a frame start signal STV, clock signals CLK1 and CLK2 to the gate drive circuit GOA through the gate pad GPD, and loading an aging signal VD to M data lines at the same time through the data pad DPD. Among them, only when the extended pixel row is scanned, the valid signal in the aging signal VD is input to the pixel in the extended pixel row. Specifically, the drive signal includes: a frame start signal STV, clock signals CLK1 and CLK2, etc. loaded to the gate drive circuit GOA; and an aging signal VD loaded to M data lines. Under the control of the frame start signal STV, clock signals CLK1 and CLK2, etc., the gate drive circuit GOA outputs scanning signals to the gate lines G1, G2, G3, ..., GN line by line. The aging signal VD is only at a high level when scanning to the extended pixel row, and is at a low level when scanning to other pixel rows. For example, the high level is usually greater than 13V for a mobile phone panel, and the high level is usually greater than 17V for a tablet computer panel. For example, the low level is 0V.

[0052] Through the above method, only the TFTs in the row where the bright spot pixel is located and the nearby pixel rows are aged, thereby achieving the purpose of eliminating the characteristic bright spots and reducing the probability of product burnout and new bright spots.

[0053] Fig. 9 Schematic diagram showing the structure of a display panel in some embodiments of the present disclosure. Fig. 9 In some embodiments, the display panel includes N gate lines (e.g., G1, G2, G3, ..., GN) and M data lines (e.g., D1, D2, D3, ..., DM). In some embodiments, N and M are positive integers. In a specific example, N=480 and M=2400. In some embodiments, the display panel includes a plurality of sub-pixels Sp arranged in N rows and M columns. Each sub-pixel in the plurality of sub-pixels Sp is connected to one of the N gate lines and to one of the M data lines. In a specific example, sub-pixels in the same column have the same color. For example, red sub-pixels, green sub-pixels, and blue sub-pixels are alternately arranged in M ​​columns of sub-pixels. Figure 1 The display panel shown in has a resolution of M×N. The display panel includes a data pad DPD for transmitting data signals to M data lines. The display panel includes a gate drive circuit GOA, which is used to generate a gate signal output to N gate lines. In addition, a gate transistor is respectively arranged between each gate line G1, G2, G3, ..., GN and the gate drive circuit GOA. The display panel also includes a gate pad GPD for transmitting a frame start signal STV and a clock signal CLK to the gate drive circuit GOA. In addition, the gate pad GPD is also used to transmit a gate line gating signal to each gating transistor.

[0054] Fig.10 are various signals in the display panel repair method according to some embodiments of the present disclosure. Fig. 9 and Fig.10 As shown, in some embodiments, the repair method of the display panel includes: loading a frame start signal STV, clock signals CLK1 and CLK2 to the gate drive circuit GOA through the gate pad GPD, and transmitting a gate line selection signal to each selection transistor; and simultaneously loading an aging signal VD to M data lines through the data pad DPD. Among them, only when the extended pixel row is scanned, the valid signal in the aging signal VD is input to the pixel in the extended pixel row. Specifically, the driving signal includes: a frame start signal STV, clock signals CLK1 and CLK2, etc. loaded to the gate drive circuit GOA; transmitting gate line selection signals GS1, GS2, ..., GST, ..., GSN to each selection transistor, wherein GST is a gate line selection signal corresponding to the extended pixel row; and an aging signal VD loaded to M data lines. Under the control of the frame start signal STV, clock signals CLK1 and CLK2, etc., the gate drive circuit GOA outputs scanning signals to the gate lines G1, G2, ..., GN row by row. The aging signal VD is at a high level during a frame of image and at a low level during the blanking stage. During a frame of image, the gate line selection signal is at a valid level only when scanning to the extended pixel row, and is at an invalid level when scanning to other pixel rows. In this way, under the joint control of the gate scanning signals G1, G2, ..., GN and the gate line selection signals GS1, GS2, ..., GST, ..., GSN, only when scanning to the extended pixel row, the valid signal in the aging signal is input to the pixels in the extended pixel row. For example, for a mobile phone panel, the high level in the aging signal VD is usually greater than 13V, and for a tablet computer panel, the high level in the aging signal VD is usually greater than 17V. For example, the low level in the aging signal VD is 0V.

[0055] Through the above method, only the TFTs in the row where the bright spot pixel is located and the nearby pixel rows are aged, thereby achieving the purpose of eliminating the characteristic bright spots and reducing the probability of product burnout and new bright spots.

[0056] In this way, a cycle of modifying the bright spot in the display panel is completed. Figure 5As shown, thereafter, the display panel is lit again, and it is detected whether there is a bright spot. If there is still a bright spot, the position coordinates of the bright spot in the display panel are obtained again; according to the position coordinates of the bright spot, the pixel row where the pixel in the bright spot is located is calculated; the calculated pixel row is expanded to obtain an expanded pixel row; then, an expanded pixel row scanning signal and an aging signal are generated; the expanded pixel row scanning signal and the aging signal are loaded into the display panel to age the display panel. It should be noted that in the latter cycle, the effective level of the aging signal will be increased. For example, in the latter cycle, the effective level of the aging signal is 2V to 4V higher than the effective level in the previous cycle, for example, 2V, 3V, or 4V higher.

[0057] Typically, two or three cycles will eliminate all bright spots in the display panel.

[0058] On the other hand, the present disclosure also provides a display panel repair device, including: an optical detection device, which is configured to obtain the position coordinates of a bright spot in the display panel; a computing device, which is configured to calculate the pixel row where the pixels in the bright spot are located according to the position coordinates of the bright spot, and expand the calculated pixel row to obtain an expanded pixel row; and an aging device, which is configured to input an aging signal to the data line in the display panel, so that only when the expanded pixel row is scanned, the valid signal in the aging signal is input to the pixels in the expanded pixel row.

[0059] Fig.11 Schematic diagram showing the structure of a display panel repair device according to some embodiments of the present disclosure. Fig.11 As shown, in some embodiments, the display panel repair device includes: an optical inspection device, a distributed file system / production execution system, a computing device, and an aging device.

[0060] Specifically, the optical inspection device is used to obtain the position coordinates of the bright spot in the display panel in the effective display area AA. In the actual repair process, the display panel is first lit. Then, the optical inspection device takes a photo of the lit display panel. The photo of the lit display panel is image processed to lock the position coordinates (X1, Y1) of the bright spot. For specific operations, refer to the following procedure to obtain the position coordinates of the bright spot in the display panel in the effective display area AA. Figure 6 .exist Figure 6 In the figure, the X direction is the width direction of the display panel, that is, the extension direction of the gate lines; the Y direction is the length direction of the display panel, that is, the extension direction of the data lines, that is, the arrangement direction of the pixel rows.

[0061] The obtained position coordinates (X1, Y1) can be uploaded to the distributed file system / production execution system. The distributed file system stores product determination information, and the production execution system stores product information.

[0062] The computing device is configured to calculate the pixel row where the pixel in the bright spot is located according to the position coordinates of the bright spot, and expand the calculated pixel row to obtain an expanded pixel row. Specifically, the computing device first calculates the pixel row where the pixel in the bright spot is located, and the calculation method is as follows:

[0063]

[0064] Among them, T 亮点 is the pixel row where the pixel in the bright spot is located; N is the total number of pixel rows in the display panel, that is, the total number of gate lines; L 总 is the total length of the effective area of ​​the display panel along the Y direction; Y1 is the coordinate of the bright spot in the Y direction.

[0065] Then, the computing device expands the calculated pixel rows to obtain expanded pixel rows. The expansion method principle is as follows: the calculated pixel rows are expanded forward and backward by a predetermined number of pixel rows respectively, so that the time to scan all expanded pixel rows reaches milliseconds. Calculate the pixel rows where the pixels in the bright spot are located, and expand the calculated pixel rows. For specific operations, please refer to Figure 7 .

[0066] The aging device is configured to input an aging signal to a data line in a display panel, so that only when an extended pixel row is scanned, a valid signal in the aging signal is input to a pixel in the extended pixel row. Specifically, the aging device includes a signal generator, which is configured to generate various signals for repairing bright spots in the display panel. For examples of various signals, please refer to Figure 8 and Fig.10 shown.

[0067] In some embodiments, the signal generator is a device independent of the aging device. Figure 8 As shown, the signals generated by the signal generator include: a frame start signal STV, clock signals CLK1 and CLK2, and an aging signal VD, wherein the aging signal VD is at a high level only when scanning to the extended pixel row, and at a low level when scanning to other pixel rows. For example, the high level is usually greater than 13V for a mobile phone panel, and the high level is usually greater than 17V for a tablet computer panel. For example, the low level is 0V.

[0068] Through the above method, only the TFTs in the row where the bright spot pixel is located and the nearby pixel rows are aged, thereby achieving the purpose of eliminating the characteristic bright spots and reducing the probability of product burnout and new bright spots.

[0069] like Fig.10As shown, the signals generated by the signal generator include: frame start signal STV, clock signals CLK1 and CLK2, gate line selection signals GS1, GS2, ..., GST, ..., GSN, and aging signal VD. During a frame of image, the aging signal VD is a valid signal. During a frame of image, the gate line selection signal is a valid level only when scanning to the extended pixel row, and the gate line selection signal is an invalid level when scanning to other pixel rows. For example, for a mobile phone panel, the high level in the aging signal VD is usually greater than 13V, and for a tablet computer panel, the high level in the aging signal VD is usually greater than 17V. For example, the low level in the aging signal VD is 0V.

[0070] Through the above method, only the TFTs in the row where the bright spot pixel is located and the nearby pixel rows are aged, thereby achieving the purpose of eliminating the characteristic bright spots and reducing the probability of product burnout and new bright spots.

[0071] In addition, if Fig.11 As shown, after the aging device ages the display panel, the display panel will be lit again, and the optical detection device will be used to detect whether there is a bright spot. If there is still a bright spot, the position coordinates of the bright spot in the display panel are obtained again by the optical detection device. Then, the pixel row where the pixel in the bright spot is located is calculated according to the position coordinates of the bright spot by the calculation device, and the calculated pixel row is expanded to obtain an expanded pixel row. Then, the aging device generates an expanded pixel row scanning signal and an aging signal; the expanded pixel row scanning signal and the aging signal are loaded into the display panel to age the display panel. It should be noted that in the subsequent cycle, the effective level of the aging signal will be increased. For example, in the subsequent cycle, the effective level of the aging signal is 2V to 4V higher than the effective level in the previous cycle, for example, 2V, 3V, or 4V higher.

[0072] For the purpose of illustration and description, the above description of the embodiments of the present invention has been given. It is not exhaustive, nor is it intended to limit the present invention to the precise form or exemplary embodiments disclosed. Therefore, the foregoing description should be considered illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described to explain the principles of the present invention and its best mode practical application, so that those skilled in the art can understand the various embodiments of the present invention and the various modifications suitable for the specific use or implementation under consideration. The scope of the present invention is intended to be defined by the appended claims and their equivalents, wherein all terms are meant to have the broadest reasonable meaning unless otherwise stated. Therefore, the term "the present invention" and the like do not necessarily limit the scope of the claims to a specific embodiment, and the reference to the exemplary embodiments of the present invention does not mean a limitation of the present invention, and such limitation should not be inferred. The present invention is limited only by the spirit and scope of the appended claims. In addition, these claims may involve the use of "first", "second", etc., followed by a noun or element. These terms should be understood as nomenclature, and should not be interpreted as limiting the number of elements modified by these nomenclatures, unless a specific number has been given. Any advantages and benefits described may not apply to all embodiments of the present invention. It should be understood that, without departing from the scope of the present invention defined by the appended claims, those skilled in the art may make changes to the described embodiments. In addition, the elements and assemblies in this disclosure are not intended to be contributed to the public, regardless of whether the element or assembly is clearly stated in the appended claims.

Claims

1. A method for repairing a display panel, comprising: providing a display panel; Obtaining the position coordinates of the bright spot in the display panel; Calculating the pixel row where the pixels in the bright spot are located according to the position coordinates of the bright spot, and expanding the calculated pixel row to obtain an expanded pixel row; as well as An aging signal is input to the data line in the display panel, so that only when the extended pixel row is scanned, a valid signal in the aging signal is input to the pixels in the extended pixel row.

2. The method according to claim 1, wherein: Obtaining the position coordinates of the bright spot in the display panel includes: lighting up the display panel; taking a photo of the illuminated display panel; and The photo of the display panel after lighting is subjected to image processing to obtain the position coordinates of the bright spot.

3. The method according to claim 1, wherein: Calculating the pixel row where the pixel in the bright spot is located according to the position coordinates of the bright spot includes: According to the following formula, the position coordinates of the bright spot are converted into the row where the pixel is located: Among them, T 亮点 is the pixel row where the pixel in the bright spot is located; N is the total number of pixel rows in the display panel; L 总 is the total length of the effective area of ​​the display panel along the direction in which the pixel rows are arranged; Y1 is the coordinate of the bright spot in the extension direction of the data line.

4. The method according to claim 1, wherein: Expand the calculated pixel rows to include: The calculated pixel rows are respectively extended forward and backward by a predetermined number of pixel rows, so that the time for scanning all the extended pixel rows reaches the millisecond level.

5. The method according to claim 1, wherein: Inputting an aging signal to a data line in the display panel so that only when the extended pixel row is scanned, a valid signal in the aging signal is input to a pixel in the extended pixel row, comprising: A frame start signal and a clock signal are loaded to the gate driving circuit through the gate pad, so that the gate driving circuit outputs a scanning signal to the gate line row by row; and an aging signal is simultaneously loaded to the data line through the data pad, wherein the aging signal is a valid signal only when scanning to the extended pixel row.

6. The method according to claim 1, wherein: Inputting an aging signal to a data line in the display panel so that only when the extended pixel row is scanned, a valid signal in the aging signal is input to a pixel in the extended pixel row, comprising: A frame start signal and a clock signal are loaded to a gate driving circuit through a gate pad, so that the gate driving circuit outputs a scanning signal to the gate line row by row; a gate line selection signal is transmitted to a selection transistor through the gate pad, so that the gate line selection signal is at a valid level only when scanning to an extended pixel row; and an aging signal is simultaneously loaded to the data line through a data pad, wherein the aging signal is a valid signal during one frame of an image.

7. The method according to claim 1, further comprising: Light up the display panel again and detect whether there is a bright spot. If there is still a bright spot, then: Obtaining the position coordinates of the bright spot in the display panel again; Calculating the pixel row where the pixels in the bright spot are located according to the position coordinates of the bright spot, and expanding the calculated pixel row to obtain an expanded pixel row; as well as Inputting an aging signal to the data line in the display panel again, so that only when the extended pixel row is scanned, the valid signal in the aging signal is input to the pixel in the extended pixel row, The level of the valid signal of the aging signal input again is greater than the level of the valid signal of the aging signal input last time.

8. The method according to claim 7, wherein: The level of the effective signal of the aging signal input again is 2V to 4V higher than the level of the effective signal of the aging signal input previously.

9. The method according to claim 8, wherein: The level of the valid signal of the aging signal input again is 3V higher than the level of the valid signal of the aging signal input previously.

10. A display panel repair device, comprising: An optical detection device configured to obtain position coordinates of bright spots in the display panel; A computing device configured to calculate the pixel row where the pixels in the bright spot are located according to the position coordinates of the bright spot, and to expand the calculated pixel row to obtain an expanded pixel row; as well as The aging device is configured to input an aging signal to the data line in the display panel, so that only when the extended pixel row is scanned, the valid signal in the aging signal is input to the pixels in the extended pixel row.

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