Method and apparatus for correcting display panel

Abstract

The application discloses a display panel correction method and device, the method comprises the following steps: obtaining the brightness data of each area of the display panel; according to the brightness data of the target splicing area in each area, the brightness of the to-be-spliced area spliced with the target splicing area is corrected, and the brightness data of the to-be-spliced area is corrected to the corrected brightness data according to the ratio of the edge brightness data of the target splicing area and the to-be-spliced area. The method can significantly reduce the brightness unevenness between each area, the splicing line problem is significantly improved, the overall display uniformity of the display panel is improved, the spliced picture looks more smooth and uniform, especially the brightness uniformity and display effect of the large-size OLED display device are significantly improved, the user experience is improved, and the method has high practicability and market prospect.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a method and apparatus for calibrating a display panel. Background Technology

[0002] Compared to small-area display panels, large-size display panels face more challenges in the manufacturing and use process, such as:

[0003] Taking OLED display panels as an example, to ensure the quality and uniformity of the entire screen, defect compensation (Demura) processing is required before leaving the factory. However, due to the limited field of view of cameras, a zone compensation scheme is usually adopted. Specifically, the screen is divided into multiple areas, each area is lit up separately, and then brightness is captured using an industrial camera. Finally, De-mura compensation is achieved through algorithms. However, existing zone compensation schemes produce obvious splicing lines after De-mura, especially as the grayscale increases, the splicing lines become increasingly obvious, affecting the viewing experience.

[0004] Taking a large display panel composed of multiple small unit screens as an example, each unit screen is independently controlled by its own circuit and display components. It is difficult to ensure consistent brightness between multiple small unit screens, which will also form splicing lines and affect the viewing effect.

[0005] Therefore, large-size display panels are prone to uneven brightness between different areas, especially the brightness difference at the splicing point, which causes obvious visual demarcation and affects the overall effect of the display panel. Summary of the Invention

[0006] To address the aforementioned technical problem of uneven brightness between different areas of a display panel, the present invention aims to provide a method and apparatus for correcting a display panel that can effectively eliminate splicing lines and improve the overall display uniformity. 。

[0007] To achieve the above-mentioned objective, one embodiment of the present invention provides a method for calibrating a display panel, comprising the following steps:

[0008] Obtain the brightness data of each area of ​​the display panel;

[0009] Based on the brightness data of the target stitching area in each region, brightness correction is performed on the areas to be stitched to the target stitching area until the brightness correction of all areas to be stitched is completed. The areas to be stitched are stitched to the target stitching area along the stitching direction. The brightness correction includes:

[0010] The ratio of the edge brightness data of the target splicing area and the area to be spliced ​​to the edge brightness data of the adjacent sides is compared, and the brightness data of the area to be spliced ​​is corrected to the corrected brightness data according to the ratio.

[0011] As a further improvement to the present invention, the following steps are also included:

[0012] Each area of ​​the display panel is displayed using several target gray levels;

[0013] The display panel is calibrated at each of the target gray levels;

[0014] During each calibration process, acquiring brightness data for each area of ​​the display panel includes:

[0015] Each region acquires the brightness data at one of its target gray levels;

[0016] The brightness correction for all the areas to be stitched includes:

[0017] Brightness correction is performed on all the areas to be stitched at one of the target gray levels.

[0018] As a further improvement of the present invention, the step of comparing the ratio of the edge brightness data of the target splicing area and the area to be spliced ​​on their respective closest sides, and correcting the brightness data of the area to be spliced ​​to corrected brightness data based on the ratio, includes:

[0019] Along the same row or column parallel to the splicing direction, calculate the ratio of the edge brightness data of the target splicing area and the area to be spliced ​​on their respective closest sides for each row or column.

[0020] When at least some of the ratios of each row or column are not within the preset range, the brightness data of the area to be spliced ​​is corrected to new brightness data according to the ratio of each row or column, and then the new brightness data of the area to be spliced ​​is corrected to the corrected brightness data.

[0021] When all the ratios of each row or column are within a preset range, the brightness data of the area to be spliced ​​is corrected to the corrected brightness data.

[0022] As a further improvement of the present invention, the calculation of the ratio of the edge brightness data of the target splicing area and the area to be spliced ​​on their respective closest sides along the same row or column parallel to the splicing direction includes:

[0023] Calculate the target mean value of the edge brightness data of each row or column of the target splicing area that is close to the edge of the area to be spliced ​​and parallel to the splicing direction;

[0024] Calculate the average edge brightness data of each row or column of the area to be stitched, which is close to the edge of the target area and parallel to the stitching direction;

[0025] Along the same row or column parallel to the splicing direction, calculate the ratio of the target mean to the mean to be spliced ​​in each row or column.

[0026] As a further improvement of the present invention, the step of correcting the brightness data of the area to be stitched to new brightness data according to the ratio of each row or column includes:

[0027] The product of the ratio of each row or column and the brightness data of the same row or column in the area to be stitched is set as the new brightness data of that row or column.

[0028] As a further improvement of the present invention, the step of correcting the brightness data of the area to be stitched to the corrected brightness data includes:

[0029] Calculate the total target mean of the edge brightness data of the target stitching area;

[0030] Calculate the total average edge brightness data of the area to be stitched;

[0031] Calculate the overall ratio, which is the ratio of the overall target mean to the overall mean to be spliced;

[0032] The product of the total ratio and the brightness data of the area to be stitched is set as the corrected brightness data.

[0033] As a further improvement to the present invention, the following steps are also included:

[0034] After the correction of one of the areas to be spliced ​​is completed, the corrected area to be spliced ​​and the target splicing area to be spliced ​​together are spliced ​​together to form a new overall target splicing area or area to be spliced.

[0035] As a further improvement of the present invention, the step of obtaining brightness data for each area of ​​the display panel includes:

[0036] The brightness data of each area of ​​the display panel is obtained, and the brightness data is smoothed and filtered.

[0037] After the brightness correction of all the areas to be stitched is completed, the following steps are also included:

[0038] Smooth the preset range at the intersection of three or more regions.

[0039] As a further improvement of the present invention, after the brightness correction of all the areas to be stitched is completed, the following step is also included:

[0040] All the aforementioned areas are spliced ​​together to form a unified display panel;

[0041] The overall display panel is subjected to Demura processing;

[0042] The display panel is inspected, and if splicing lines are present, the brightness of each area of ​​the display panel is recalibrated.

[0043] To achieve one of the above-mentioned objectives, an embodiment of the present invention provides a calibration device for a display panel, comprising:

[0044] The acquisition module is used to acquire brightness data for each area of ​​the display panel;

[0045] The correction module is used to perform brightness correction on the areas to be stitched together with the target stitching area based on the brightness data of the target stitching area in each area, until the brightness correction of all the areas to be stitched is completed. The areas to be stitched are stitched together with the target stitching area along the stitching direction. The brightness correction includes: comparing the ratio of the edge brightness data of the target stitching area and the areas to be stitched to each other on their respective closest sides, and correcting the brightness data of the areas to be stitched to corrected brightness data according to the ratio.

[0046] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides a readable storage medium storing a computer program that, when executed by a processing module, can implement the steps in the above-described display panel calibration method.

[0047] Compared with existing technologies, the present invention has the following beneficial effects: the correction method for this display panel can effectively solve the problem of uneven brightness between different areas of a large-size display panel, which in turn leads to obvious splicing lines. By acquiring the brightness data of each area of ​​the display panel and comparing the ratio of the edge brightness data of the target splicing area and the area to be spliced ​​for correction, the uneven brightness between different areas can be significantly reduced, the splicing line problem is significantly improved, the overall display uniformity of the display panel is improved, and the spliced ​​image looks smoother and more uniform. In particular, it significantly improves the brightness uniformity and display effect of large-size OLED display devices, enhances the user experience, and has high practicality and market prospects. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of an imaging device according to an embodiment of the present invention capturing images of each area of ​​a display panel;

[0049] Figure 2 This is a flowchart of a calibration method for a display panel according to an embodiment of the present invention;

[0050] Figure 3 This is a schematic diagram of the splicing of the upper left and upper right regions according to an embodiment of the present invention;

[0051] Figure 4 This is a schematic diagram of the splicing of the lower left and lower right regions according to an embodiment of the present invention;

[0052] Figure 5 This is a schematic diagram of the splicing of the upper and lower regions according to an embodiment of the present invention;

[0053] Figure 6 This is a flowchart of a tilt correction method for the area to be spliced ​​according to an embodiment of the present invention;

[0054] Figure 7 This is a schematic diagram of an imaging device capturing a display panel according to an embodiment of the present invention;

[0055] Figure 8 This is a schematic diagram illustrating the difference in edge brightness distribution between the target splicing area and the area to be spliced, according to an embodiment of the present invention.

[0056] Figure 9 This is another schematic diagram illustrating the difference in edge brightness distribution between the target splicing area and the area to be spliced, according to an embodiment of the present invention;

[0057] Figure 10 This is a flowchart of a method for correcting a display panel at various target gray levels according to an embodiment of the present invention;

[0058] Figure 11 This is a schematic diagram of a display panel calibration device according to an embodiment of the present invention;

[0059] Among them, 10 is the display panel; 11 is the target splicing area; 12 is the area to be spliced; 13 is the edge side; 14 is the i-th row; 15 is the j-th column; 20 is the imaging device; 21 is the ideal posture; 22 is the actual posture; A1 is the upper left area; A2 is the upper right area; A3 is the lower left area; A4 is the lower right area; T1 is the row splicing direction; T2 is the column splicing direction. Detailed Implementation

[0060] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0061] One embodiment of the present invention provides a method and apparatus for correcting a display panel that can effectively eliminate splicing lines and improve the overall display uniformity of the display panel.

[0062] As described in the background section, the display panel in this embodiment is mainly for large-size display panels, such as large-size OLED (Organic Light Emitting Diode) display panels, or large-size micro-LED, large-size micro-OLED, etc., or large display panels composed of multiple small unit screens spliced ​​together, such as large panels composed of multiple small LCD / LED / QLED / mini-LED unit screens spliced ​​together. Taking large-size OLED display panels as an example, they have advantages such as self-illumination, wide viewing angle, high contrast, and fast response, and are widely used in various display devices such as televisions, mobile phones, and tablets.

[0063] Before performing the display panel calibration, you can first run:

[0064] Step S10: Display each area of ​​the display panel 10 with several target gray levels, and capture an image of each area using the imaging device 20.

[0065] Here, the screen is divided into multiple regions, for example, m×n regions, such as... Figure 1 As shown, m and n are both 2. The following explanation will use the simplest 2×2 as an example, which includes the upper left region A1, the upper right region A2, the lower left region A3, and the lower right region A4. If m and n are other values, they can be adjusted adaptively based on this method.

[0066] Each area is individually illuminated, and then an imaging device 20, such as an industrial camera, is used to capture the brightness of the area. During each capture, the content displayed in each area, the grayscale, the working distance, the lens focal length, and the camera pixel size are kept the same. The imaging device 20 is located at the center of each area and captures the image in a vertical position as much as possible to minimize the error caused by the industrial camera. Figure 1 The image was divided into four 2×2 regions, and each grayscale was captured four times by an imaging device with 20 pixels, providing accurate data support for subsequent brightness analysis and fitting. Other regions can also be divided into honeycomb, multi-ring, or other patterns.

[0067] Taking the OLED display panel 10 as an example, the four areas here can be virtual partitions. That is, the display panel 10 itself does not have boundaries between different areas. Instead, it is an artificial division of areas based on the shooting field of view and working distance of the imaging device 20 to meet the shooting requirements of a single partition.

[0068] Taking a large display panel 10 composed of multiple small unit screens as an example, the four areas here can also be four separate small unit screens. That is, the display panel 10 has real physical boundaries, and is divided into four areas according to these physical boundaries. Alternatively, the large display panel 10 composed of multiple small unit screens can also be divided into different zones using virtual partitions.

[0069] To ensure the uniformity of the display panel 10 under different brightness conditions, brightness correction needs to be performed at multiple target gray levels. Several target gray levels, such as L16, L32, L64, L128, L192, and L255, will be displayed for each area of ​​the display panel 10. At each target gray level, brightness data for each area will be acquired using an industrial camera to facilitate subsequent brightness correction.

[0070] By performing brightness correction on the display panel 10 at different target gray levels, the brightness uniformity at each gray level can be ensured, so that the display panel 10 can maintain a consistent brightness distribution under various brightness conditions, thereby improving the overall display effect and user experience. In particular, when displaying images at different gray levels, the brightness transition is more natural and consistent.

[0071] The specific number of target gray levels can be determined according to the specific needs of production; in extreme cases, there may only be one type of gray level.

[0072] The following is combined Figures 1-9 This invention describes a calibration method for a display panel 10 provided in an embodiment of the present invention. Although the present application provides method operation steps as shown in the following embodiments or flowcharts, the execution order of these steps is not limited to the execution order provided in the embodiments of the present application, based on conventional or non-creative labor, where there is no necessary causal relationship in the logically defined steps of the method.

[0073] Specifically, a calibration method for a display panel 10 in this embodiment is as follows: Figure 2 As shown, it includes the following steps:

[0074] Step S20: Obtain brightness data for each area of ​​the display panel 10;

[0075] Step S30: Determine whether the brightness correction of all the areas 12 to be spliced ​​has been completed;

[0076] If not, then step S40: Based on the brightness data of the target splicing area 11 in each area, perform brightness correction on the splicing area 12 to be spliced ​​with the target splicing area 11. The brightness correction includes: comparing the ratio of the edge brightness data of the target splicing area 11 and the splicing area 12 on their respective adjacent sides, and correcting the brightness data of the splicing area 12 to the corrected brightness data based on the ratio.

[0077] If so, wait for the brightness correction of splicing area 12 to be completed.

[0078] The area to be spliced ​​12 is spliced ​​with the target splicing area 11 along the splicing direction.

[0079] In step S10 above, images of each region have been captured by imaging device 20. In step S20, these images are acquired to obtain the brightness data of each region, which includes the brightness value of each pixel.

[0080] Next, a region is selected as the target stitching region 11, and the uncorrected region adjacent to the target stitching region 11 is selected as the region to be stitched 12. The target stitching region 11 can be a manually selected reference region or a region that has already been corrected, for example, in... Figure 3 In the middle, the upper left region A1 is designated as the target stitching region 11, and the upper right region A2 is designated as the region to be stitched 12; in Figure 4 In this context, the lower left region A3 is designated as the target stitching region 11, and the lower right region A4 is designated as the region to be stitched 12; the upper left region A1 and the lower left region A3 are manually selected reference regions. Figure 5 In this process, the upper region is designated as the target splicing region 11, and the lower region is designated as the region to be spliced ​​12. Here, the upper region is the region that has already been corrected.

[0081] Then, the edge brightness data of the target splicing area 11 and the area to be spliced ​​12 that are close to each other are obtained. Here, the edge sides 13 of the target splicing area 11 and the area to be spliced ​​12 that are close to each other are obtained. If the target splicing area 11 is on the left and the area to be spliced ​​12 is on the right, the right edge brightness data of the target splicing area 11 and the left edge brightness data of the area to be spliced ​​12 are obtained.

[0082] by Figure 3 For example, these are the right edge of the upper left region A1 and the left edge of the upper right region A2; Figure 4 For example, the right edge of the lower left region A3 and the left edge of the lower right region A4 are respectively; Figure 5 For example, the lower edge of the upper region and the upper edge of the lower region are respectively; the definition of edge side 13 can be a range of edges that are determined by humans, such as the range of 10 to 30 pixels close to the edge. Taking the edge side 13 of the upper left region A1 as an example, the area of ​​15 columns of pixels from right to left in the upper left region A1 on the right edge, and the edge side 13 of the upper region as an example, the area of ​​15 rows of pixels from bottom to top in the upper region on the lower edge. The edge brightness data is the brightness data of the pixels within this edge range.

[0083] Then, the ratio of the edge brightness data of the target stitching area 11 and the area to be stitched 12 on their closest sides is compared. Based on this ratio, the brightness data of the area to be stitched 12 is corrected to corrected brightness data. This ratio can be the ratio of pixel brightness in a row or column, or the ratio of pixel brightness within a region. The ratio k is calculated using the formula: k = edge brightness data of the target stitching area 11 / edge brightness data of the area to be stitched 12. Then, based on the calculated brightness ratio, the brightness data of the area to be stitched 12 is adjusted to match the brightness of the target stitching area 11.

[0084] Repeat the above steps until the brightness correction of all areas 12 to be stitched is completed.

[0085] By taking the above steps, the brightness data of each area of ​​the display panel 10 is obtained, and the ratio of the edge brightness data of the target splicing area 11 and the area to be spliced ​​12 is compared and corrected. This can effectively eliminate the brightness difference between the areas of the display panel 10, make the brightness distribution of the entire display panel 10 more uniform, eliminate splicing line problems, improve the overall display uniformity of the display panel 10, and make the spliced ​​picture look smoother and more uniform.

[0086] Furthermore, the calibration method for the display panel 10 also includes the following steps:

[0087] After the correction of the area to be spliced ​​12 is completed, the corrected area to be spliced ​​12 and the target splicing area 11 to be spliced ​​with it are spliced ​​together to form a new whole target splicing area 11 or area to be spliced ​​12.

[0088] Specifically, once the brightness data of a region 12 to be stitched is corrected, the region no longer exists alone. Instead, it can be combined with its adjacent target stitching region 11 as a new target stitching region 11 or region 12 to be stitched, and participate in the subsequent correction process.

[0089] like Figures 3-5 As shown, after the upper right region A2 is corrected, it can be spliced ​​together with the upper left region A1 to form a single upper region; after the lower right region A4 is corrected, it can be spliced ​​together with the lower left region A3 to form a single lower region; then the upper region becomes the new target splicing region 11, and the lower region becomes the new region to be spliced ​​12. The same principle applies when m and n are other numbers, such as 3×3.

[0090] After completing the brightness correction of the area to be spliced ​​12, the corrected area and the target splicing area 11 are spliced ​​together to form a new overall area to be spliced ​​12. This helps to ensure the continuity and consistency of the step-by-step correction and splicing process, effectively reduces the uneven brightness that may occur during the splicing process, improves the overall correction effect, and makes the final display panel 10 more uniform in brightness.

[0091] Further, step S40 is as follows: Figure 6 As shown, it specifically includes:

[0092] Step S41: Along the same row or column parallel to the splicing direction, calculate the ratio of the edge brightness data of the target splicing area 11 and the area to be spliced ​​12 on their respective adjacent sides in each row or column.

[0093] Step S42: Determine that the ratio of each row or column is within a preset range.

[0094] If not, that is, when at least some of the ratios of each row or column are not within the preset range, proceed with steps S43 and S44.

[0095] If so, that is, when all the ratios of each row or column are within the preset range, proceed to step S44.

[0096] Step S43: Correct the brightness data of the area 12 to be spliced ​​to new brightness data according to the ratio of each row or column.

[0097] Step S44: Correct the brightness data of the area 12 to be spliced ​​to the corrected brightness data.

[0098] The correction process in step S40 is explained in detail below. Step S40 includes two brightness corrections: tilt correction and overall correction. In step S41 to step S43, tilt correction is performed. The tilt correction effect is determined based on the tilt of the image. That is to say, if the image is not tilted, the image may not change at all, and no actual correction behavior occurs. After the tilt correction is completed, step S44 is performed for overall correction.

[0099] Tilt Correction

[0100] exist Figure 3 and Figure 4 The splicing direction in the image is the row splicing direction T1, and the pixels considered here are the pixels in the same row; Figure 5 The splicing direction in the text is column splicing direction T2, and the pixels considered here are those in the same column. Pixels in the same row or column parallel to the splicing direction are... Figure 3Taking the left - right splicing in [the figure] as an example, the direction parallel to the splicing direction is the left - right direction, that is, the row direction. At this time, the \(i\) - th row counted from top to bottom in the upper - left area \(A1\) and the \(i\) - th row counted from top to bottom in the upper - right area \(A2\) are the same row parallel to the splicing direction in the left - right splicing mode. Similarly, taking Figure 5 the up - down splicing in [the figure] as an example, the direction parallel to the splicing direction is the up - down direction, that is, the column direction. At this time, the \(j\) - th column counted from left to right in the upper area and the \(j\) - th column counted from left to right in the lower area are the same column parallel to the splicing direction in the up - down splicing mode.

[0101] Refer Figure 7 As shown, when the imaging device 20 photographs the display panel 10, ideally, the display panel 20 of the imaging device 20 is parallel to the display panel 10, or the imaging device 20 has the same posture when photographing each area. The ideal posture 21 is as Figure 7 shown. However, due to the existence of errors, it is difficult to ensure that the imaging device 20 has no deviation every time it takes a picture. So the possible actual posture 22 is as Figure 7 shown. There is a deviation between the actual posture 22 and the ideal posture 21. Between the different areas photographed correspondingly, there may be horizontal or vertical tilt distortion, and the subsequent Demura (defect compensation) processing of the image based on this distortion will bring obvious splicing lines.

[0102] In addition, if the large display panel 10 is composed of multiple small unit screens spliced together, there may also be a relative tilt between different unit screens, and this tilt error will also bring obvious splicing lines.

[0103] Therefore, the present invention eliminates the splicing line problem caused by the tilt of the imaging device 20 by judging whether the ratios of all the rows or columns are within a preset interval. Specifically, when performing brightness correction on the display panel 10, by calculating the ratio of the edge brightness data of the mutually - approaching sides of the target splicing area 11 and the to - be - spliced area 12 along the same row or the same column parallel to the splicing direction, the calculation of the ratio of the same row or the same column can reflect the change relationship of the respective edge brightness distributions.

[0104] When the edge brightness distributions of the target splicing area 11 and the to - be - spliced area 12 are different as Figure 8 shown, it means that when taking the target splicing area 11 as a reference, one side of the to - be - spliced area 12 is gradually tilted. At this time, that is: when at least part of the ratios of each row or each column are not within the preset interval, it indicates that there is a phenomenon of uneven brightness, and it is necessary to correct the brightness data of the to - be - spliced area 12. Figure 8 The left - to - right reflects the change of the ratio. For example, the ratio on the far left is 1, and the ratio gradually changes larger to the right. Taking Figure 3 the splicing of the upper - left area \(A1\) and the upper - right area \(A2\) as an example, if the ratio of each row is compared and shows Figure 8 The distribution of the data indicates that the upper right region A2 is tilted relative to the upper left region A1, requiring correction of the brightness data of the upper right region A2 to correct this tilt. At this point, based on the ratio of each row or column, the brightness data of the region to be stitched 12 is adjusted to new brightness data until all ratios of each row or column are within a preset range. In this case, during the subsequent step S44, the brightness data of the region to be stitched 12 is the adjusted new brightness data.

[0105] When all the ratios of each row or column are within a preset range, then as follows: Figure 9 As shown, this means that the difference in edge brightness distribution between the target splicing area 11 and the area to be spliced ​​12 is very small, with no tilt or a tilt so small as to be negligible, meaning that tilt correction is not required. The specific numerical range of the preset interval can be determined based on production data.

[0106] By calculating the ratio of the edge brightness data of each row or column of the target splicing area 11 to the area to be spliced ​​12 along the same row or column parallel to the splicing direction, and performing brightness correction based on the ratio, the problem caused by different tilts of the imaging device 20 can be overcome. This allows the subsequent correction to be carried out on the basis that there is no tilt in each area, further refining the brightness correction process, thereby more accurately adjusting the brightness of each row or column, ensuring the brightness uniformity of each row or column, reducing the brightness difference in local areas, and thus improving the overall display effect.

[0107] Further, step S41 includes:

[0108] Step S411: Calculate the target mean value p1 of the edge brightness data of each row or column of the target splicing area 11 that is close to the edge side 13 of the area to be spliced ​​12 and parallel to the splicing direction;

[0109] Step S412: Calculate the average edge brightness data p2 of each row or column of the area to be stitched 12 that is close to the edge 13 of the target stitching area 11 and parallel to the stitching direction;

[0110] Step S413: Along the same row or column parallel to the splicing direction, calculate the ratio k1 of the target mean to the mean to be spliced ​​in each row or column, k1 = p1 / p2.

[0111] by Figure 3Taking a row comparison and an edge pixel count of 15 as an example, the target mean p1 is the mean of the 15 pixels in one row of the edge side 13 of the target stitching region 11. The target mean of the entire edge side 13 of the target stitching region 11 can be a column vector of P1. The mean to be stitched p2 is the mean of the 15 pixels in one row of the edge side 13 of the region to be stitched. The mean to be stitched of the entire edge side 13 of the region to be stitched can be a column vector of P2. The ratio K1 of all rows is the column vector of the P1 / P2 ratio.

[0112] If we take Figure 5 Taking the comparison of the same column as an example, the comparison of the same row above is changed to the comparison of the same column, where P1, P2, and K1 are all row vectors.

[0113] By calculating the target mean and the mean value to be spliced ​​for each row or column of the edge side 13 of the target splicing area 11 and the area to be spliced ​​12, and using these mean values ​​to calculate the ratio of each row or column, the tilt of each row or column can be accurately determined, and the distribution pattern of the tilt can be obtained. This helps to eliminate splicing line problems caused by tilt, improve the brightness consistency at the splicing point, and ensure a smooth transition of the overall brightness of the display panel 10.

[0114] Further, step S43 includes:

[0115] The product of the ratio of each row or column and the brightness data of the same row or column in the area to be spliced ​​12 is set as the new brightness data of that row or column.

[0116] by Figure 3 or Figure 4 For example, when the upper right region A2 or the lower right region A4 is tilted, the brightness of the pixels in each row of the upper right region A2 or the lower right region A4 is multiplied by the ratio corresponding to that row. For example, the brightness of each pixel in the i-th row 14 is multiplied by the ratio ki in the column vector K1. Finally, the brightness of all pixels in the upper right region A2 or the lower right region A4 is updated to the brightness data after the tilt is corrected.

[0117] by Figure 5 For example, when the lower region is tilted, the brightness of each column of pixels in the lower region is multiplied by the ratio corresponding to that column. For example, the brightness of each pixel in column j is multiplied by the ratio kj in row vector K1. Finally, the brightness of all pixels in the lower region is updated to the brightness data after the tilt is corrected.

[0118] To ensure a smooth brightness transition for each row or column during brightness correction, the product of the ratio of each row or column and the brightness data of the corresponding row or column in the area to be stitched 12 is set as the new brightness data for that row or column. Specifically, the ratio of each row or column is first calculated, and then this ratio is multiplied by the brightness data of the corresponding row or column in the area to be stitched 12 to obtain the new brightness data. This row-by-row, column-by-column brightness correction method effectively avoids brightness jumps, ensures the smoothness and consistency of brightness transitions, and further improves the uniformity of the display effect.

[0119] By setting the product of the ratio of each row or column with the brightness data of the area to be stitched 12 as the new brightness data, the horizontal or vertical tilt can be corrected, making the brightness transition between the two areas smoother and avoiding obvious brightness jumps. This allows subsequent corrections to be made on the basis of all partitions being level, resulting in better correction effects.

[0120] Overall correction

[0121] The overall correction step S44 includes:

[0122] Step S441: Calculate the total target mean Q1 of the edge brightness data of the target stitching area 11.

[0123] Step S442: Calculate the total average value Q2 of the edge brightness data of the area to be stitched 12.

[0124] Step S443: Calculate the total ratio, which is the ratio KQ of the total target mean to the total mean to be spliced, i.e., KQ = Q1 / Q2.

[0125] Step S444: The product of the total ratio and the brightness data of the area to be spliced ​​12 is set as the corrected brightness data.

[0126] Having overcome the tilting issue as described above, by calculating the overall target mean Q1 and the overall mean of the area to be stitched Q2, the overall brightness consistency of the stitched area can be ensured. Figure 3 For example, if the number of edge pixels is 15 and there are a total of 100 rows, then the total target mean Q1 is the average brightness of 1500 pixels on the right edge of the upper left region A1, and the total mean to be stitched Q2 is the average brightness of 1500 pixels on the left edge of the upper right region A2. By calculating the total target mean and the total mean to be stitched of the edge brightness data of the target stitching region 11 and the region to be stitched 12, and using these total means to calculate the total ratio for overall brightness correction, the brightness consistency of the entire stitching region can be ensured.

[0127] This two-stage brightness correction method, namely tilt correction and overall correction, makes the overall display effect smoother, improves the brightness uniformity of the display panel 10, and reduces brightness differences.

[0128] In addition, in conjunction with the explanations of different target gray levels above, such as Figure 10 As shown, this embodiment can calibrate the display panel 10 at each of the target grayscale levels; during each calibration process, acquiring the brightness data of each area of ​​the display panel 10 includes:

[0129] Step S20': The brightness data of each region is acquired at one of the target gray levels;

[0130] The brightness correction for all the areas 12 to be stitched includes:

[0131] Step S40': Brightness correction is performed on all the areas 12 to be stitched at one of the target gray levels.

[0132] For the brightness data at each grayscale level, the calibration method described above for the display panel 10 is applied. The ratio of the edge brightness data of the target splicing area 11 to the area to be spliced ​​12 is compared, and brightness calibration is performed based on the ratio. After calibration at the current grayscale level, calibration is then applied to the next grayscale level. This independent calibration at each grayscale level ensures that the display panel 10 maintains a consistent brightness distribution under various brightness conditions, improving the overall display effect.

[0133] Further, acquiring the brightness data of each area of ​​the display panel 10 includes:

[0134] Brightness data for each area of ​​the display panel 10 is acquired, and the brightness data is then smoothed and filtered.

[0135] Here, smoothing filtering methods such as average filtering, Gaussian filtering, or mean filtering can be applied to reduce noise and fluctuations in the brightness data, improve the smoothness of brightness correction, and prevent abnormal bright or dark spots from raising or lowering the mean of the entire area, thus affecting subsequent Demura processing.

[0136] After the brightness correction of all the areas 12 to be stitched is completed, the following steps are also included:

[0137] Smooth the preset range at the intersection of three or more regions.

[0138] Generally speaking, with Figure 1The rectangular partitioning method shown involves smoothing the preset range at the intersection of the four regions. Within the preset range at the intersection, the average brightness of adjacent regions is calculated, and the brightness data is smoothed. Specific smoothing methods can include Gaussian filtering, median filtering, etc., to ensure a smooth brightness transition at the intersection points, avoiding uneven brightness and further improving the overall display effect of the display panel 10, thus preventing significant brightness differences at the intersection points.

[0139] Furthermore, after the brightness correction of all the areas 12 to be stitched is completed, the following steps are also included:

[0140] Display panel 10 that combines all the aforementioned areas into a whole;

[0141] The entire display panel 10 is subjected to Demura (defect compensation) processing;

[0142] The display panel 10 is inspected, and if splicing lines are present, the brightness of each area of ​​the display panel 10 is recalibrated.

[0143] After completing the brightness correction of all areas 12 to be spliced, all areas are spliced ​​into an overall display panel 10, and Demura processing and testing are performed to ensure that the splicing lines of the final display panel 10 are not obvious or even eliminated, thereby improving the overall display effect and quality, eliminating residual brightness unevenness, and ensuring that the display panel 10 can provide a consistent and high-quality display effect in various usage environments.

[0144] Compared with the prior art, this embodiment has the following beneficial effects:

[0145] (1) Eliminating or reducing splicing line problems. The correction method of this display panel 10 can effectively solve the problem of uneven brightness between different areas of a large-size display panel 10, which in turn causes obvious splicing lines. By obtaining the brightness data of each area of ​​the display panel 10 and comparing the ratio of the edge brightness data of the target splicing area 11 and the area to be spliced ​​12 for correction, the uneven brightness between different areas can be significantly reduced, the splicing line problem is significantly improved, the overall display uniformity of the display panel 10 is improved, and the spliced ​​picture looks smoother and more uniform. In particular, it significantly improves the brightness uniformity and display effect of large-size OLED display devices, enhances the user experience, and has high practicality and market prospects.

[0146] (2) Improve the accuracy of brightness correction. By calculating and correcting the brightness ratio row by row and column by column, the brightness correction process is refined, avoiding the impact of camera tilt and multi-unit display panel tilt. The ratio of brightness data at the edge of each area is calculated, and the brightness distribution law is determined through fitting analysis, thereby accurately correcting the tilt of each area. Subsequently, a unified brightness correction is performed. The distribution of the ratio of each row or column and the total ratio makes the brightness correction more detailed and accurate.

[0147] (3) Enhance the uniformity of the display effect. After brightness correction of all areas 12 to be spliced, smoothing processing at the intersections avoids fluctuations in brightness data at local points, improving the smoothness of brightness correction. Furthermore, after Demura processing, multiple corrections can be performed based on the detection results to further ensure the uniformity and consistency of the display effect.

[0148] In summary, this invention solves the splicing line problems generated during the partition compensation process of large-size OLED display devices and the splicing line problems generated by multi-unit screen splicing through an innovative two-stage brightness correction method, which significantly improves the display effect and user experience. At the same time, it provides a complete hardware and software implementation plan, which has high practicality and market prospects.

[0149] In one embodiment, a calibration device for a display panel is provided, such as... Figure 11 As shown. The calibration device for this display panel includes the following modules, and the specific functions of each module are as follows:

[0150] The acquisition module is used to acquire brightness data for each area of ​​the display panel;

[0151] The correction module is used to perform brightness correction on the areas to be stitched together with the target stitching area based on the brightness data of the target stitching area in each area, until the brightness correction of all the areas to be stitched is completed. The areas to be stitched are stitched together with the target stitching area along the stitching direction. The brightness correction includes: comparing the ratio of the edge brightness data of the target stitching area and the areas to be stitched to each other on their respective closest sides, and correcting the brightness data of the areas to be stitched to corrected brightness data according to the ratio.

[0152] The calibration device for the display panel can acquire the brightness data of the display panel and perform calibration based on the brightness data until the brightness calibration of all areas to be spliced ​​is completed.

[0153] It should be noted that for details not disclosed in the calibration device for the display panel in this embodiment of the invention, please refer to the details disclosed in the calibration method for the display panel in this embodiment of the invention.

[0154] Those skilled in the art will understand that the schematic diagram is merely an example of a calibration device for a display panel and does not constitute a limitation on the terminal device of the calibration device for a display panel. It may include more or fewer components than shown in the diagram, or combine certain components, or different components. For example, the calibration device for a display panel may also include input / output devices, network access devices, buses, etc.

[0155] The calibration device for the display panel may also include computing devices such as computers, laptops, PDAs, and cloud servers, as well as, but not limited to, a processing module, a storage module, and a computer program stored in the storage module and executable on the processing module, such as the display panel calibration method program described above. When the processing module executes the computer program, it implements the steps in the various display panel calibration method embodiments described above, for example... Figure 2 , 6 The steps shown in 10.

[0156] Furthermore, one embodiment of the present invention provides a readable storage medium storing a computer program, which, when executed by a processing module, can implement the steps in the above-described display panel calibration method, that is, implement the steps in any of the technical solutions of the above-described display panel calibration method.

[0157] If the module integrated into the calibration method for the display panel is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by the processing module, it can implement the steps of the various method embodiments described above.

[0158] The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium can include any entity or device capable of carrying the computer program code, recording media, U disks, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added to or subtracted according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electrical carrier signals and telecommunication signals.

[0159] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0160] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for calibrating a display panel, characterized in that, Includes the following steps: Obtain the brightness data of each area of ​​the display panel; Based on the brightness data of the target stitching area in each region, brightness correction is performed on the areas to be stitched to the target stitching area until the brightness correction of all areas to be stitched is completed. The areas to be stitched are stitched to the target stitching area along the stitching direction. The brightness correction includes: Along the same row or column parallel to the splicing direction, calculate the ratio of the edge brightness data of the target splicing area and the area to be spliced ​​on their respective closest sides for each row or column. When at least some of the ratios of each row or column are not within the preset range, the brightness data of the area to be spliced ​​is corrected to new brightness data according to the ratio of each row or column, and then the new brightness data of the area to be spliced ​​is corrected to corrected brightness data. When all the ratios of each row or column are within a preset range, the brightness data of the area to be spliced ​​is corrected to the corrected brightness data. The step of correcting the brightness data of the area to be stitched to the corrected brightness data includes: The product of the total ratio and the brightness data of the area to be stitched is set as the corrected brightness data, wherein the total ratio is the ratio of the total target mean of the brightness data of all pixels within the edge range of the target stitching area to the total mean of the brightness data of all pixels within the edge range of the area to be stitched.

2. The calibration method for a display panel according to claim 1, characterized in that, It also includes the following steps: Each area of ​​the display panel is displayed using several target gray levels; The display panel is calibrated at each of the target gray levels; During each calibration process, acquiring brightness data for each area of ​​the display panel includes: Each region acquires the brightness data at one of its target gray levels; The brightness correction for all the areas to be stitched includes: Brightness correction is performed on all the areas to be stitched at one of the target gray levels.

3. The calibration method for a display panel according to claim 1, characterized in that, The calculation of the ratio of edge brightness data of the target splicing area and the area to be spliced ​​on their closest sides along the same row or column parallel to the splicing direction includes: Calculate the target mean value of the edge brightness data of each row or column of the target splicing area that is close to the edge of the area to be spliced ​​and parallel to the splicing direction; Calculate the average edge brightness data of each row or column of the area to be stitched, which is close to the edge of the target area and parallel to the stitching direction; Along the same row or column parallel to the splicing direction, calculate the ratio of the target mean to the mean to be spliced ​​in each row or column.

4. The calibration method for a display panel according to claim 3, characterized in that, The step of correcting the brightness data of the area to be stitched to new brightness data based on the ratio of each row or column includes: The product of the ratio of each row or column and the brightness data of the same row or column in the area to be stitched is set as the new brightness data of that row or column.

5. The calibration method for a display panel according to claim 1, characterized in that, It also includes the following steps: After the correction of one of the areas to be spliced ​​is completed, the corrected area to be spliced ​​and the target splicing area to be spliced ​​together are spliced ​​together to form a new overall target splicing area or area to be spliced.

6. The calibration method for a display panel according to claim 1, characterized in that, The step of obtaining brightness data for each area of ​​the display panel includes: The brightness data of each area of ​​the display panel is obtained, and the brightness data is smoothed and filtered. After the brightness correction of all the areas to be stitched is completed, the following steps are also included: Smooth the preset range at the intersection of three or more regions.

7. The calibration method for a display panel according to claim 1, characterized in that, After the brightness correction of all the areas to be stitched is completed, the following steps are also included: All the aforementioned areas are spliced ​​together to form a unified display panel; The overall display panel is subjected to Demura processing; The display panel is inspected, and if splicing lines are present, the brightness of each area of ​​the display panel is recalibrated.

8. A calibration device for a display panel, characterized in that, include: The acquisition module is used to acquire brightness data for each area of ​​the display panel; A correction module is used to perform brightness correction on the areas to be stitched together with the target stitching area based on the brightness data of the target stitching area in each region, until the brightness correction of all the areas to be stitched is completed. The areas to be stitched are stitched together with the target stitching area along the stitching direction. The brightness correction includes: Along the same row or column parallel to the splicing direction, calculate the ratio of the edge brightness data of the target splicing area and the area to be spliced ​​on their respective closest sides for each row or column. When at least some of the ratios of each row or column are not within the preset range, the brightness data of the area to be spliced ​​is corrected to new brightness data according to the ratio of each row or column, and then the new brightness data of the area to be spliced ​​is corrected to corrected brightness data. When all the ratios of each row or column are within a preset range, the brightness data of the area to be spliced ​​is corrected to the corrected brightness data. The step of correcting the brightness data of the area to be stitched to the corrected brightness data includes: The product of the total ratio and the brightness data of the area to be stitched is set as the corrected brightness data, wherein the total ratio is the ratio of the total target mean of the brightness data of all pixels within the edge range of the target stitching area to the total mean of the brightness data of all pixels within the edge range of the area to be stitched.

9. A readable storage medium storing a computer program, characterized in that, When executed by the processing module, the computer program can perform the steps in the calibration method for the display panel as described in any one of claims 1 to 7.

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