Method for detecting display panel, method for correcting display panel, and display device

Abstract

The application discloses a display panel detection method, a correction method and a display device. In the display panel, adjacent sub-pixel columns share a power supply line to receive a power supply voltage for lighting corresponding sub-pixels. A sub-pixel array of the display panel includes a plurality of repeating units arranged in a row direction. The number n of sub-pixel columns in each repeating unit is greater than or equal to a set threshold value. Each repeating unit includes at least a plurality of first sub-pixels corresponding to a first light-emitting color and a plurality of second sub-pixels corresponding to a second light-emitting color. The detection method includes obtaining a luminance change value of each test group; and determining whether there is luminance crosstalk according to the luminance change value of each test group. If the difference between the luminance change value corresponding to one of the test groups and the luminance change value of a preset number of test groups outside the test group exceeds a preset range, there is luminance crosstalk between each sub-pixel column that is lit in the test group.

Description

Technical Field

[0001] This invention relates to the field of displays, and in particular to a method for detecting and correcting a display panel, and a display device. Background Technology

[0002] Organic light-emitting diode (OLED) panels have many advantages, such as self-illumination, low driving voltage, high luminous efficiency, short response time, high clarity and contrast, near 180° viewing angle, wide operating temperature range, and the ability to achieve flexible display and large-area full-color display. They are widely recognized in the industry as the display devices with the greatest development potential.

[0003] To increase aperture ratio, adjacent columns of sub-pixels in display panels typically share a single power supply line. However, since the cross-sectional area of ​​the power supply line inside the screen is usually relatively small, a certain impedance is unavoidable. Adjacent sub-pixels share the voltage drop across the power supply line resistance, which may lead to luminance crosstalk between different color sub-pixels within a certain distance, affecting the independent emission of each column of sub-pixels. In practical applications, gamma calibration of display panels usually involves calibrating the luminance and color coordinates of grayscale images to ensure that the luminance and color coordinates of other colors conform to the specified color gamut based on the characteristics of independent emission. However, due to the aforementioned issues, color images may exhibit color casts after gamma calibration. Furthermore, many algorithms in driving OLED display panels are designed based on the independent emission of pixels. Therefore, a detection method, correction method, and display device for display panels are urgently needed to solve the above problems. Summary of the Invention

[0004] In view of the above problems, the purpose of this application is to provide a detection method, a correction method and a display device for a display panel, so as to improve the light emission independence of each sub-pixel.

[0005] According to one aspect of this application, a detection method for a display panel is provided, wherein adjacent sub-pixel columns in the display panel share a power supply line to receive a power supply voltage for illuminating the corresponding sub-pixels. The sub-pixel array of the display panel includes multiple repeating units arranged along a row direction. The number of sub-pixel columns in each repeating unit is greater than or equal to a set threshold n, and each repeating unit includes at least multiple first sub-pixels corresponding to a first emitting color and multiple second sub-pixels corresponding to a second emitting color. The detection method includes: obtaining a brightness change value for each test group; and determining whether brightness crosstalk exists based on the brightness change value of each test group. If the difference between the brightness change value corresponding to one of the multiple test groups and the brightness change values ​​of a preset number of test groups outside that test group all exceed a preset range, then brightness crosstalk exists between the illuminated sub-pixel columns in that test group. The step of obtaining the brightness change value for each test group includes: Under the first test pattern, each first sub-pixel in the k-th sub-pixel column of each of the M repeating units and each second sub-pixel in the i-th sub-pixel column of each of the repeating units are simultaneously illuminated to obtain a corresponding first brightness parameter, where i and k are unequal positive integers less than or equal to n, and i has different values ​​for different test groups, and M is a positive integer; under the second test pattern, each first sub-pixel in the k-th sub-pixel column of the M repeating units is illuminated and the remaining sub-pixels in each repeating unit are turned off to obtain a corresponding second brightness parameter; under the third test pattern, each second sub-pixel in the i-th sub-pixel column of the M preset number of repeating units is illuminated and the remaining sub-pixels in each repeating unit are turned off to obtain a corresponding third brightness parameter; and the brightness change value of the test group is obtained based on the difference between the sum of the second brightness parameter, the third brightness parameter and the first brightness parameter.

[0006] Optionally, the detection method includes the steps of repeatedly obtaining the brightness change value of each test group based on multiple color combinations of the first sub-pixel and the second sub-pixel, and determining whether brightness crosstalk exists.

[0007] Optionally, the display panel includes red sub-pixels, green sub-pixels, and blue sub-pixels, and each sub-pixel is arranged according to the RGBG arrangement. The various color combinations include a first combination and a second combination. In the first combination, the first sub-pixel is a green sub-pixel and the second sub-pixel is a blue sub-pixel; in the second combination, the first sub-pixel is a green sub-pixel and the second sub-pixel is a red sub-pixel.

[0008] Optionally, the minimum set threshold is 6.

[0009] Optionally, the method for displaying the first test pattern, the second test pattern, and the third test pattern includes displaying in separate regions on the same screen or displaying in separate frames on the same screen.

[0010] Optionally, the k-th sub-pixel column in each of the repeating units receives the power supply voltage first in the sub-pixel column containing each of the first sub-pixels in the repeating unit.

[0011] Optionally, the number of test groups is the same as the number of possible values ​​for i.

[0012] Optionally, the brightness parameters corresponding to each test pattern are obtained by measuring the brightness values ​​of each test pattern measurement point, wherein the relative positions of each test pattern measurement point and its corresponding test pattern are the same.

[0013] According to another aspect of this application, a method for correcting a display panel is provided, comprising: obtaining the position of a luminance crosstalk subpixel column using the display panel detection method as described in any of the preceding claims, wherein in each of the M repeating units lit under each first test pattern, each second subpixel lit in the i-th subpixel column has a first subpixel in the same row lit in the k-th subpixel column, where M, i, and k are all positive integers; obtaining correction parameters corresponding to any first subpixel and second subpixel in the same row of the luminance crosstalk subpixel column in any of the repeating units; and compensating the data voltage of the first subpixel and second subpixel in each row of the luminance crosstalk subpixel column according to the correction parameters.

[0014] Optionally, the correction method includes the steps of repeatedly obtaining the correction parameters and compensating the data voltage of the first sub-pixel and the second sub-pixel in each row based on multiple color combinations of the first sub-pixel and the second sub-pixel.

[0015] Optionally, the step of obtaining the correction parameter includes:

[0016] The data voltages of the first and second sub-pixels in each row of the luminance crosstalk sub-pixel column are compensated according to different gain parameters; and crosstalk is eliminated by detecting whether it is eliminated, and the gain parameter when crosstalk is eliminated is used as the correction parameter.

[0017] Optionally, the data voltages of the first and second sub-pixels in each row of the luminance crosstalk sub-pixel column are calculated according to the following formula.

[0018] Vout1 = Vin1 + Vin2 × gain

[0019] Vout2 = Vin2 + Vin1 × gain

[0020] Wherein, Vin1 represents the data voltage before the first sub-pixel compensation; Vout1 represents the data voltage after the first sub-pixel compensation; Vin2 represents the data voltage before the second sub-pixel compensation; Vout2 represents the data voltage after the second sub-pixel compensation; and gain represents the gain parameter.

[0021] According to a third aspect of this application, a display device is provided, comprising: a display module including a display panel and a driving circuit connected to the display panel, the display panel including sub-pixels arranged in an array, the driving circuit including a trimming module for compensating the data voltage of each of the sub-pixels according to a correction parameter; and a processor for performing a display panel detection method as described in any of the preceding claims to determine the position of a brightness crosstalk sub-pixel column, and outputting the corresponding correction parameter based on the position of the sub-pixel column to compensate the data voltage of each second sub-pixel at the position of the sub-pixel column and the first sub-pixel in the same row as the second sub-pixel.

[0022] According to the brightness crosstalk detection method, correction method and display device of the display panel provided in this application, the brightness change values ​​of each test group are compared to evaluate whether the pixel brightness of the display panel affects each other due to the voltage drop of the resistance of the local shared power supply line. The influence caused by the crosstalk is eliminated by compensating the driving voltage of the sub-pixel at the crosstalk position, thereby improving the light emission independence of each pixel, reducing the color shift caused by brightness crosstalk and improving the display quality. Attached Figure Description

[0023] The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0024] Figure 1 A schematic diagram showing the subpixel arrangement of an RGBG display panel;

[0025] Figure 2 A flowchart illustrating the display panel detection method according to an embodiment of this application is shown;

[0026] Figure 3 A schematic structural diagram of the repeating unit in an embodiment of this application is shown;

[0027] Figure 4 This diagram illustrates the process of obtaining brightness change values.

[0028] Figure 5 This diagram illustrates the display of the first display screen for each test group of the first color combination in this application;

[0029] Figure 6 This diagram illustrates the display of the second display screen for each test group of the first color combination in this application;

[0030] Figure 7 This diagram illustrates the display of the first display screen for each test group of the second color combination in this application;

[0031] Figure 8 This diagram illustrates the display of the second display screen for each test group of the second color combination in this application;

[0032] Figure 9 A schematic flowchart of the brightness crosstalk correction method according to an embodiment of this application is shown;

[0033] Figure 10 A schematic structural block diagram of a display device according to an embodiment of this application is shown. Detailed Implementation

[0034] Various embodiments of the invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0035] Furthermore, certain terms are used in this patent specification and claims to refer to specific components. Those skilled in the art will understand that manufacturers may use different names to refer to the same component. This patent specification and claims do not distinguish components based on differences in name, but rather on differences in function.

[0036] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” or “including,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0037] The display panel includes multiple sub-pixels arranged in an array. Each sub-pixel emits light of a preset color. The geometric arrangement of the sub-pixels allows the human eye to mix spatially multiplexed colors together, thereby achieving the effect of displaying colors. To extend the lifespan of the display panel, an RGBG sub-pixel arrangement is typically used to arrange the color sub-pixels. In the following description, a display panel using an RGBG sub-pixel arrangement is used as an example to specifically illustrate the detection method, correction method, and display device provided in this application. However, it should be understood that this application should not be limited thereto.

[0038] Figure 1 This diagram illustrates the subpixel arrangement of an RGBG display panel. Figure 1 As shown, the display panel 100 includes three types of sub-pixels: a red sub-pixel R corresponding to red light, a green sub-pixel G corresponding to green light, and a blue sub-pixel B corresponding to blue light. Each sub-pixel employs an RGBG arrangement (e.g., Pentile arrangement, diamond arrangement, and pearl arrangement) to improve the lifespan of the display panel. Further, as... Figure 1 As shown, odd-numbered column subpixels include red and blue subpixels arranged alternately along the column direction, while even-numbered column subpixels include only green subpixels. Furthermore, in this embodiment, adjacent odd-numbered and even-numbered column subpixels share a single power supply line.

[0039] Figure 2 This diagram illustrates a flowchart of a display panel detection method according to an embodiment of this application. Figure 2 As shown, the detection method implemented in this application includes the following steps S110 to S150:

[0040] Step S110: Select the first sub-pixel and the second sub-pixel;

[0041] In this step, adjacent first sub-pixels corresponding to the first emission color and second sub-pixels corresponding to the second emission color in the row direction are selected. The column of first sub-pixels containing the first sub-pixels and the column of second sub-pixels containing the second sub-pixels share a single power supply line. Various color combinations can be obtained by different selection schemes for the first and second sub-pixels.

[0042] In this embodiment, the subpixel arrangement corresponding to RGBG includes two color combinations of the first and second subpixels. In the first color combination, one of the first and second subpixels is a green subpixel, and the other is a blue subpixel; in the second combination, one of the first and second subpixels is a green subpixel, and the other is a red subpixel. In the following examples, a green pixel is used as the first subpixel; a red or blue subpixel is used as the second subpixel in different color combinations. The corresponding subpixel column containing the green subpixel is the first subpixel column (e.g., ...). Figure 1 (Even-numbered sub-pixels), the sub-pixel column containing the blue or red sub-pixel is the second sub-pixel column (e.g., ... Figure 1 (odd-numbered sub-pixels).

[0043] Step S120: Select repeating units according to the preset distance:

[0044] In this step, the display panel is divided into multiple repeating units along the row direction according to a preset distance, and each repeating unit includes at least multiple first sub-pixels and multiple second sub-pixels. The preset distance corresponds to the maximum number of sub-pixel columns where luminance crosstalk may occur. Furthermore, it should be understood that, in order to provide sufficient reference samples in subsequent judgments, the number of sub-pixel columns n in each repeating unit should be greater than or equal to a set threshold (n is a positive integer). In this embodiment, the sub-pixel arrangement corresponding to RGBG should satisfy a set threshold of at least 6, that is, the repeating unit 110 includes at least 3 first sub-pixel columns and 3 second sub-pixel columns.

[0045] Figure 3 A schematic structural diagram of the repeating unit in an embodiment of this application is shown. Figure 3 In the example shown, the display panel comprises 8 rows of subpixels. Furthermore, to balance the number of control samples and detection efficiency, in... Figure 3 In the repeating unit 110 shown, there are 8 columns of sub-pixels within a preset distance (i.e., 4 columns of first sub-pixels and 4 columns of second sub-pixels), and adjacent first sub-pixel columns and second sub-pixel columns share a power supply line L (sub-pixel columns C1 and C2 share power supply line L1, sub-pixel columns C3 and C4 share power supply line L2, sub-pixel columns C5 and C6 share power supply line L3, and sub-pixel columns C7 and C8 share power supply line L4).

[0046] Step S130: Obtain the brightness change value for each test group:

[0047] like Figure 4 As shown, the process for obtaining the brightness change value of each test group includes the following steps S131 to S134:

[0048] Step S131: Measure the first brightness parameter corresponding to the first test pattern;

[0049] In the first test pattern, each first sub-pixel in the k-th sub-pixel column of M repeating units (M is a positive integer) and each second sub-pixel in the i-th sub-pixel column of each repeating unit are illuminated. Here, i and k are unequal positive integers less than or equal to n (i and k are both positive integers). Different test groups correspond to different values ​​of i, and the number of test groups corresponding to the same first and second sub-pixel color combination is the same as the number of possible values ​​for i. In this embodiment, the M repeated units that are illuminated are arranged continuously on the display panel. In some other embodiments, the M repeated units that are illuminated can be arranged on the display panel at certain intervals. In some embodiments, in the same repeating unit, each second sub-pixel in the i-th sub-pixel column has a first sub-pixel in the k-th sub-pixel column that is illuminated in the same row as it. The brightness data corresponding to the first test pattern is recorded as the first brightness parameter L1. In some embodiments, the brightness data of the center point of the first test pattern is measured by an external measuring device as the first brightness parameter. In some other embodiments, the brightness data of other points can also be tested as the first brightness parameter. Furthermore, it should be understood that in some embodiments, the k-th sub-pixel column is the first to receive the power supply voltage in the sub-pixel column containing the first sub-pixel in each repeating unit.

[0050] Step S132: Measure the second brightness parameter corresponding to the second test pattern;

[0051] In the second test pattern, each first sub-pixel in the k-th sub-pixel column of the repeating unit (i.e., M repeating units) with the same number and arrangement (e.g., consecutive arrangement) as in step S131 is illuminated, and the remaining sub-pixels in each repeating unit are turned off. The brightness data corresponding to the second test pattern is denoted as the second brightness parameter L2. In some embodiments, the relative position of the second brightness parameter measurement point and the second test pattern is consistent with the relative position of the first brightness parameter measurement point and the first test pattern in the horizontal direction, for example, they can be mirror images (for example, the first brightness parameter measurement point can be set at the position corresponding to the q-th sub-pixel from left to right in the p-th row of the first test pattern, and the second brightness parameter measurement point can be set at the position corresponding to the q-th sub-pixel from right to left in the p-th row of the second test pattern. p and q are positive integers). In a preferred embodiment, the relative position of the second brightness parameter measurement point and the second test pattern is the same as the relative position of the first brightness parameter measurement point and the first test pattern, thereby minimizing the influence of other factors on the brightness.

[0052] Step S133: Measure the third brightness parameter corresponding to the third test pattern;

[0053] In the third test pattern, each second sub-pixel in the i-th sub-pixel column of the repeating units (M repeating units) with the same number and arrangement as in step S131 is illuminated, and the remaining sub-pixels in each repeating unit are turned off. The brightness data corresponding to the third test pattern is recorded as the third brightness parameter L3. In some embodiments, the relative position of the third brightness parameter measurement point and the third test pattern is consistent with the relative position of the first brightness parameter measurement point and the first test pattern in the horizontal direction. In a preferred embodiment, the relative position of the third brightness parameter measurement point and the third test pattern is the same as the relative position of the first brightness parameter measurement point and the first test pattern.

[0054] Step S134: Calculate the brightness change value based on the first, second, and third brightness parameters.

[0055] In this step, the brightness change value ΔL of the test group is calculated according to the following formula (1):

[0056] ΔL=L2+L3-L1(1)

[0057] Where L1, L2, and L3 represent the first brightness parameter, the second brightness parameter, and the third brightness parameter, respectively.

[0058] However, it should be understood that in step S130, the display panel can display the first, second, and third test patterns through display methods such as displaying in separate areas on the same screen or displaying in separate frames on the same screen.

[0059] In this embodiment, corresponding to such Figure 3 The repeating unit 110 shown includes four columns of second sub-pixel columns (e.g., ...). Figure 3 As shown in column C1, C3, C5, and C7 (subpixels), i has four different values. Therefore, each color combination of the first and second subpixels includes four test groups. Further, taking the simultaneous display of different areas on the same screen as an example, in this embodiment, the display panel is divided along the row direction into a first part 10 and a second part 20, and the number of repeating units 110 contained in the first part display panel 10 and the second part display panel 20 is the same. The display panel displays two display screens. In the first display screen, the first part display panel 10 displays the first test pattern, and the second part display panel 20 is black. In the second display screen, the first part display panel 10 displays the second test pattern, and the second part display panel 20 displays the third test pattern.

[0060] Specifically, taking the first color combination as an example (the green sub-pixel is the first sub-pixel, and the blue sub-pixel is the second sub-pixel). Figure 5 and Figure 6 The diagrams show the first and second display screens for different test groups.

[0061] See Figure 3 and Figure 5 Corresponding to the first display screen of the first color combination (the first sub-pixel is a green sub-pixel, and the second sub-pixel is a blue sub-pixel), in the first test group (arranged a in the diagram), the first part of the display panel 10 illuminates the blue sub-pixel B in column C1 and the green sub-pixel G in column C2 of each repeating unit, while the second part of the display panel 20 remains black; in the second test group (arranged b in the diagram), the first part of the display panel 10 illuminates the green sub-pixel G in column C2 and the blue sub-pixel B in column C3 of each repeating unit, while the second part of the display panel 20 remains black; in the third test group (arranged c in the diagram), the first part of the display panel 10 illuminates the green sub-pixel G in column C2 and the blue sub-pixel B in column C5 of each repeating unit, while the second part of the display panel 20 remains black; in the fourth test group (arranged d in the diagram), the first part of the display panel 10 illuminates the green sub-pixel G in column C2 and the blue sub-pixel B in column C7 of each repeating unit, while the second part of the display panel 20 remains black.

[0062] See Figure 3 and Figure 6 Corresponding to the second display screen of the first color combination (the first sub-pixel is a green sub-pixel, and the second sub-pixel is a blue sub-pixel), in the first test group (arrangement a in the diagram), the first part of the display panel 10 illuminates the green sub-pixel G in the C2 column of each repeating unit, and the second part of the display panel 20 illuminates the blue sub-pixel B in the C1 column of each repeating unit; in the second test group (arrangement b in the diagram), the first part of the display panel 10 illuminates the green sub-pixel G in the C2 column of each repeating unit, and the second part of the display panel 20 illuminates... In each repeating unit, the blue sub-pixel B in column C3 is illuminated; in the third test group (arranged as shown in diagram c), the first part of the display panel 10 illuminates the green sub-pixel G in column C2 of each repeating unit, and the second part of the display panel 20 illuminates the blue sub-pixel B in column C5 of each repeating unit; in the fourth test group (arranged as shown in diagram d), the first part of the display panel 10 illuminates the green sub-pixel G in column C2 of each repeating unit, and the second part of the display panel 20 illuminates the blue sub-pixel B in column C7 of each repeating unit.

[0063] The brightness data of the center point of all the repeated units illuminated under each test pattern was measured using a brightness testing device, and the brightness change value corresponding to each test group was further calculated, as shown in Table 1 below:

[0064] arrangement L1 L2 L3 ΔL = L2 + L3 - L1 a 170.3 159.8 12.58 2.08 b 159.6 158.6 12.49 11.49 c 170.5 158.9 12.56 0.96 d 170.3 159.4 12.44 1.54

[0065] Table 1

[0066] However, it should be understood that the display method of dividing the screen into regions should not be limited to this. For example, in some embodiments, in the first display screen, the first part of the display panel 10 displays the first test pattern, and the second part of the display panel 20 displays the second test pattern; in the second display screen, the first part of the display panel 10 is black, and the second part of the display panel 20 displays the third test pattern. In other embodiments, the display panel can be divided into three parts along the row direction: left, middle, and right. Each part includes the same number of repeating units. In this case, in the same display screen, the left part of the display panel displays the first test pattern, the middle part displays the second test pattern, and the right part displays the third test pattern, allowing for the simultaneous measurement of the first, second, and third brightness parameters.

[0067] Similarly, it should be understood that in the embodiment of simultaneous frame display, it is preferable to display the first, second, and third test patterns in the same display area of ​​the display panel.

[0068] Step S140: Determine whether there is luminance crosstalk based on the luminance change values ​​of each test group:

[0069] If the difference between the brightness change value corresponding to one of the multiple test groups corresponding to the same first sub-pixel and second sub-pixel and the brightness change value of a preset number of test groups outside the test group all exceed a preset range, then there is brightness crosstalk between the columns of lit sub-pixels in the test group.

[0070] In this embodiment, comparing the brightness change values ​​corresponding to the first color combination obtained in Table 1 above, the brightness change value corresponding to arrangement b is significantly different from the brightness change values ​​corresponding to arrangements a, c, and d. Therefore, there is brightness crosstalk between the first sub-pixel column and the second sub-pixel column corresponding to arrangement b.

[0071] Step S150: Determine if the detection is complete.

[0072] In this step, it is determined whether the detection of all color combinations of the first and second sub-pixels has been completed. If not, the combination of the first and second sub-pixels is changed and the above steps S110 to S140 are repeated until the detection of all color combinations is completed.

[0073] In this embodiment, the second color combination is changed (the first sub-pixel is a green sub-pixel and the second sub-pixel is a red sub-pixel) and steps S110 to S140 are repeated.

[0074] Figure 7 and Figure 8 The diagrams show the first and second display screens for different test groups corresponding to the second color combination.

[0075] See Figure 3 and Figure 7 Corresponding to the first display screen of the second color combination (the first sub-pixel is a green sub-pixel, and the second sub-pixel is a red sub-pixel), in the first test group (as shown in arrangement e), the first part of the display panel 10 illuminates the red sub-pixel R in column C1 and the green sub-pixel G in column C2 of each repeating unit, while the second part of the display panel 20 remains black; in the second test group (as shown in arrangement f), the first part of the display panel 10 illuminates the green sub-pixel G in column C2 and the red sub-pixel R in column C3 of each repeating unit, while the second part of the display panel 20 remains black; in the third test group (as shown in arrangement g), the first part of the display panel 10 illuminates the green sub-pixel G in column C2 and the red sub-pixel R in column C5 of each repeating unit, while the second part of the display panel 20 remains black; in the fourth test group (as shown in arrangement h), the first part of the display panel 10 illuminates the green sub-pixel G in column C2 and the red sub-pixel R in column C7 of each repeating unit, while the second part of the display panel 20 remains black.

[0076] See Figure 3 and Figure 8 Corresponding to the second display screen of the second color combination (the first sub-pixel is a green sub-pixel, and the second sub-pixel is a red sub-pixel), in the first test group (illustrated arrangement e), the first part of the display panel illuminates the green sub-pixel G in the C2 column of each repeating unit, and the second part of the display panel 20 illuminates the red sub-pixel R in the C1 column of each repeating unit; in the second test group (illustrated arrangement f), the first part of the display panel illuminates the green sub-pixel G in the C2 column of each repeating unit, and the second part of the display panel 20 illuminates the red sub-pixel R in the C3 column of each repeating unit; in the third test group (illustrated arrangement g), the first part of the display panel 10 illuminates the green sub-pixel G in the C2 column of each repeating unit, and the second part of the display panel 20 illuminates the red sub-pixel R in the C5 column of each repeating unit; in the fourth test group (illustrated arrangement h), the first part of the display panel 10 illuminates the green sub-pixel G in the C2 column of each repeating unit, and the second part of the display panel 20 illuminates the red sub-pixel R in the C4 column of each repeating unit.

[0077] The brightness data of the center point of all the repeated units illuminated under each test pattern was measured using a brightness testing device, and the brightness change value corresponding to each test group was further calculated, as shown in Table 2 below:

[0078] arrangement L1 L2 L3 ΔL = L2 + L3 - L1 e 210.4 160.1 53.87 3.57 f 208.8 160.4 54.07 5.67 g 210.8 160.4 53.94 3.54 h 210.9 160.4 54.2 3.7

[0079] Table 2

[0080] Comparing the brightness change values ​​corresponding to the second color combination obtained in Table 2 above, the brightness change value corresponding to arrangement f is significantly different from the brightness change values ​​corresponding to arrangements e, g, and h. Therefore, there is brightness crosstalk between the first sub-pixel column (the sub-pixel column where the green sub-pixel is located) and the second sub-pixel column (the sub-pixel column where the red sub-pixel is located) corresponding to arrangement f.

[0081] Furthermore, this application also provides a method for correcting brightness crosstalk in a display panel. Figure 9 A flowchart illustrating the modification method of this application is shown, as follows: Figure 9 As shown, the modification method of this application embodiment includes the following steps S210 to S250:

[0082] Step S210: Select the first sub-pixel and the second sub-pixel:

[0083] In this step, adjacent first sub-pixels corresponding to the first emission color and second sub-pixels corresponding to the second emission color in the row direction are selected. The column of first sub-pixels containing the first sub-pixels and the column of second sub-pixels containing the second sub-pixels share a single power supply line. Various color combinations can be obtained by different selection schemes for the first and second sub-pixels.

[0084] In this embodiment, the subpixel arrangement corresponding to RGBG includes two color combinations of the first and second subpixels. In the first color combination, one of the first and second subpixels is a green subpixel, and the other is a blue subpixel; in the second combination, one of the first and second subpixels is a green subpixel, and the other is a red subpixel. In the following examples, a green pixel is used as the first subpixel; a red or blue subpixel is used as the second subpixel in different color combinations. The corresponding subpixel column containing the green subpixel is the first subpixel column (e.g., ...). Figure 1 (Even-numbered sub-pixels), the sub-pixel column containing the blue or red sub-pixel is the second sub-pixel column (e.g., ... Figure 1 (odd-numbered sub-pixels).

[0085] Step S220: Obtain the position of the brightness crosstalk sub-pixel column.

[0086] In this step, the position of the brightness crosstalk sub-pixel column is obtained according to the detection method provided in the embodiment of this application, for example. It should be noted that, in order to facilitate subsequent compensation of data voltage, in the M repeating units lit up under each first test pattern, each second sub-pixel lit up in the i-th sub-pixel column in each repeating unit has a first sub-pixel in the same row lit up in the k-th sub-pixel column (M, i, and k are all positive integers).

[0087] Step S230: Obtain the correction parameters corresponding to the first and second sub-pixels of any row in any repeating unit that correspond to the brightness crosstalk sub-pixel column.

[0088] In this step, the data voltages corresponding to the first and second sub-pixels of the same sub-pixel row in any repeating unit, corresponding to the brightness crosstalk sub-pixel column (the first and second sub-pixels are both lit in their corresponding test groups), are obtained, and the data voltages of the first and second sub-pixels in each row are compensated according to the compensation formula. The compensation formula is as follows:

[0089] Vout1 = Vin1 + Vin2 × gain (2)

[0090] Vout2=Vin2+Vin1×gain(3)

[0091] Where Vin1 represents the data voltage before the first sub-pixel compensation; Vout1 represents the data voltage after the first sub-pixel compensation; Vin2 represents the data voltage before the second sub-pixel compensation; Vout2 represents the data voltage after the second sub-pixel compensation; and gain represents the gain parameter.

[0092] After compensating the data voltage, the detection method provided in this application is repeated to detect whether crosstalk has been eliminated, and the gain parameter when crosstalk is eliminated is used as the correction parameter corresponding to the first and second sub-pixels in the same row of the brightness crosstalk sub-pixel column.

[0093] In this embodiment, corresponding to the measurement results shown in Table (1), there is brightness crosstalk between the first sub-pixel column and the second sub-pixel column corresponding to arrangement b. Therefore, the data voltage of the first sub-pixel (green sub-pixel) and the second sub-pixel (blue sub-pixel) lit in the same row of the same repeating unit under arrangement b is obtained. The data voltage is processed by gain according to the compensation formula and the ΔL corresponding to each test group is repeatedly measured. The gain parameter when eliminating crosstalk is used as the correction parameter.

[0094] Table 3 shows the brightness data after gain compensation according to the gain formula provided in this application, as shown in Table 1.

[0095] arrangement L1 L2 L3 ΔL = L2 + L3 - L1 a 170.3 159.8 12.58 2.08 b 170.2 158.7 12.51 1.01 c 170.5 158.9 12.56 0.96 d 170.3 159.4 12.44 1.54

[0096] Table 3

[0097] Step S240: Compensate for the data voltage of the first and second sub-pixels in each row of the luminance crosstalk sub-pixel column according to the correction parameters:

[0098] In this step, the data voltage of the first and second sub-pixels in each row of the brightness crosstalk sub-pixel column is compensated according to the correction parameters obtained in step S230 and the compensation formulas as shown in equations (2) and (3) above.

[0099] Step S250: Determine if compensation is complete.

[0100] In this step, it is determined whether the compensation for all color combinations of the first and second sub-pixels has been completed. If not, the above steps S210 to S240 are repeated until the compensation is completed.

[0101] In this embodiment, steps S210 to S240 are repeated for the second color combination. Corresponding to the measurement results shown in Table (2), there is luminance crosstalk between the first sub-pixel column and the second sub-pixel column corresponding to arrangement f. Therefore, the data voltage of the first sub-pixel (green sub-pixel) and the second sub-pixel (red sub-pixel) lit in the same row of the same repeating unit under arrangement f is obtained. The data voltage is processed by gain according to the compensation formula, and the ΔL corresponding to each test group is repeatedly measured. The gain parameter when eliminating crosstalk is used as the correction parameter.

[0102] Table 4 shows the brightness data after gain compensation according to the gain formula provided in this application, as shown in Table 2.

[0103] arrangement L1 L2 L3 ΔL = L2 + L3 - L1 e 210.4 160.1 53.87 3.57 f 210.8 160.4 54.01 3.61 g 210.8 160.4 53.94 3.54 h 210.9 160.4 54.2 3.7

[0104] Table 4

[0105] According to the measurement results, the brightness crosstalk can be significantly corrected by correcting the data voltages of the first and second sub-pixels with crosstalk (i.e., the data voltages of the first and second sub-pixels corresponding to the first and second sub-pixels in the arrangements b and f) according to the above compensation formulas (2) and (3).

[0106] According to the display panel detection method and correction method provided in this application, the display panel is evaluated to determine whether there is mutual interference in pixel brightness caused by the voltage drop of the local shared power supply line resistance, and the influence caused by it is eliminated, thereby improving the light emission independence of each pixel, reducing the color shift phenomenon caused by brightness crosstalk, and improving display quality.

[0107] Furthermore, this application also provides a display device. Figure 10 A schematic structural block diagram of a display device according to an embodiment of this application is shown. Figure 10As shown, the display device includes a display module and a processor 300 connected in communication. The processor executes the display panel detection method provided in this application to determine the position of a brightness crosstalk sub-pixel column, and outputs corresponding correction parameters based on the position of the sub-pixel column to compensate for the data voltage of each second sub-pixel at that position and the first sub-pixel in the same row as the second sub-pixel. The display module includes a display panel 100 and a driving circuit 200. The display panel 100 includes a plurality of pixels P arranged in an array, each pixel including a plurality of sub-pixels (not shown in the figure), each sub-pixel emitting light of a preset color. The geometric arrangement of the sub-pixels allows the human eye to mix spatially multiplexed colors together, thereby achieving the effect of displaying colors. The driving circuit 200 includes a source driver 210, a gate driver 220, and a tuning module 230. The gate driver 220 is connected to the display panel 100 through multiple scan lines, providing scan voltage to each sub-pixel. The source driver 210 provides data voltage to each sub-pixel. The scanning voltage drives the sub-pixels in a time-division manner. For example, in some embodiments, any row of sub-pixels is lit up at the same time, and the row of sub-pixels receives the corresponding data voltage for display. Furthermore, the driving circuit 200 also includes a trimming module 230 connected between the source driver 210 and the display panel 100. The trimming module 230 receives correction parameters provided by the processor and compensates for the data voltage provided by the source driver 210 according to the corresponding gain formula. This corrects the mutual interference of pixel brightness caused by the voltage drop across the local shared power supply line resistor, improves the light emission independence of each sub-pixel, reduces color shift caused by brightness crosstalk, and improves display quality.

[0108] As described above, these embodiments of the present invention do not exhaustively describe all details, nor do they limit the invention to specific embodiments. Clearly, many modifications and variations can be made based on the above description. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to effectively utilize the invention and its modifications. The scope of protection of this invention should be determined by the scope defined in the claims of this invention.

Claims

1. A detection method for a display panel, wherein adjacent sub-pixel columns in the display panel share a power supply line to receive a power supply voltage for illuminating the corresponding sub-pixels, the sub-pixel array of the display panel includes a plurality of repeating units arranged along a row direction, the number of sub-pixel columns in each repeating unit is greater than or equal to a set threshold n, and each repeating unit includes at least a plurality of first sub-pixels corresponding to a first emitting color and a plurality of second sub-pixels corresponding to a second emitting color, wherein... The detection method includes: Obtain the brightness change value for each test group; and The presence of luminance crosstalk is determined based on the luminance change values ​​of each test group. If the difference between the luminance change value corresponding to one of the multiple test groups and the luminance change values ​​of a preset number of test groups outside that test group all exceed a preset range, then luminance crosstalk exists between the lit sub-pixel columns in that test group. The steps for obtaining the brightness change value for each test group include: Under the first test pattern, each first sub-pixel in the k-th sub-pixel column of each of the M repeating units and each second sub-pixel in the i-th sub-pixel column of each repeating unit are simultaneously lit to obtain the corresponding first brightness parameter, where i and k are unequal positive integers less than or equal to n, and i has different values ​​corresponding to different test groups, and M is a positive integer; Under the second test pattern, each of the first sub-pixels in the kth sub-pixel column of the M repeating units is lit up and the remaining sub-pixels in each repeating unit are turned off to obtain the corresponding second brightness parameter. Under the third test pattern, illuminate each of the second sub-pixels in the i-th sub-pixel column within the M preset number of repeating units and turn off the remaining sub-pixels within each repeating unit to obtain the corresponding third brightness parameter; and The brightness change value of the test group is obtained based on the difference between the sum of the second brightness parameter and the third brightness parameter and the first brightness parameter.

2. The detection method according to claim 1, wherein, The detection method includes the steps of repeatedly obtaining the brightness change value of each test group based on multiple color combinations of the first sub-pixel and the second sub-pixel, and determining whether brightness crosstalk exists.

3. The detection method according to claim 2, wherein, The display panel includes red sub-pixels, green sub-pixels, and blue sub-pixels, and each sub-pixel is arranged according to the RGBG arrangement. The various color combinations include a first combination and a second combination. In the first combination, the first sub-pixel is a green sub-pixel and the second sub-pixel is a blue sub-pixel; in the second combination, the first sub-pixel is a green sub-pixel and the second sub-pixel is a red sub-pixel.

4. The detection method according to claim 3, wherein, The minimum set threshold is 6.

5. The detection method according to claim 1, wherein, The methods for displaying the first test pattern, the second test pattern, and the third test pattern include simultaneous screen regional display and simultaneous screen frame display.

6. The detection method according to claim 1, wherein, The k-th sub-pixel column in each of the repeating units is the first to receive the power supply voltage in the sub-pixel column containing the first sub-pixel in the repeating unit.

7. The detection method according to claim 1, wherein, The number of test groups is the same as the number of possible values ​​for i.

8. The detection method according to claim 1, wherein, The brightness parameters corresponding to each test pattern are obtained by measuring the brightness values ​​of each test pattern measurement point, and the relative positions of each test pattern measurement point and its corresponding test pattern are the same.

9. A method for correcting a display panel, comprising: The detection method of the display panel according to any one of claims 1 to 8 obtains the position of the brightness crosstalk sub-pixel column, and in each of the M repeating units lit up under each first test pattern, each second sub-pixel lit up in the i-th sub-pixel column has a first sub-pixel in the same row lit up in the k-th sub-pixel column, where M, i, and k are all positive integers. Obtain the correction parameters corresponding to the first and second sub-pixels in the same row of the brightness crosstalk sub-pixel column in the repeating unit; The data voltage of the first and second sub-pixels in each row of the luminance crosstalk sub-pixel column is compensated according to the correction parameters.

10. The correction method according to claim 9, wherein, The correction method involves repeatedly obtaining the correction parameters and compensating the data voltage of the first sub-pixel and the second sub-pixel in each row based on multiple color combinations of the first sub-pixel and the second sub-pixel.

11. The correction method according to claim 10, wherein, The steps for obtaining the correction parameters include: Compensate the data voltage of the first and second sub-pixels in each row of the luminance crosstalk sub-pixel column according to different gain parameters; and Detect whether crosstalk has been eliminated, and use the gain parameter when crosstalk is eliminated as the correction parameter.

12. The correction method according to claim 11, wherein, The data voltages of the first and second sub-pixels in each row of the luminance crosstalk sub-pixel column are calculated according to the following formula. Vout1 = Vin1 + Vin2 × gain Vout2 = Vin2 + Vin1 × gain Wherein, Vin1 represents the data voltage before the first sub-pixel compensation; Vout1 represents the data voltage after the first sub-pixel compensation; Vin2 represents the data voltage before the second sub-pixel compensation; Vout2 represents the data voltage after the second sub-pixel compensation; and gain represents the gain parameter.

13. A display device, comprising: The display module includes a display panel and a driving circuit connected to the display panel. The display panel includes sub-pixels arranged in an array. The driving circuit includes a trimming module, which is used to compensate the data voltage of each sub-pixel according to a correction parameter. as well as A processor is configured to execute the display panel detection method according to any one of claims 1 to 8 to determine the position of a brightness crosstalk subpixel column, and output the corresponding correction parameter based on the position of the subpixel column to compensate for the data voltage of each second subpixel at the position of the subpixel column and the first subpixel in the same row as the second subpixel.

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