Appearance Inspection Method and System Based on Mini LED Display

Abstract

This invention relates to the field of LED display technology, specifically a method and system for appearance inspection based on Mini LED displays. The method includes: sequentially extracting matrix pixels from a Mini LED pixel matrix; calculating the target phase shift of the matrix pixels based on pixel coordinates and unit phase shift; constructing a single-channel pixel trigonometric function based on the appearance inspection period, unit frame time, and target phase shift; performing pixel display control on the matrix pixels to obtain an appearance display video; constructing a single-channel pixel matrix sequence based on the appearance inspection frame order; superimposing the single-channel pixel matrix sequence with the same pixels to obtain an actual superimposed pixel matrix; determining whether the actual superimposed pixel matrix is ​​equal to the standard superimposed pixel matrix; if not, performing appearance inspection to identify abnormal pixels. This invention can improve the efficiency of appearance inspection of defective pixels.

Description

Technical Field

[0001] This invention relates to the field of LED display technology, and in particular to an appearance inspection method and system based on Mini LED displays. Background Technology

[0002] Against the backdrop of rapid development in display technology, Mini LED is widely used in high-end TVs, gaming monitors, and automotive displays due to its high brightness, high contrast, and precise local dimming capabilities. However, because of the high pixel density and complex driving process of Mini LED displays, pixel abnormalities (such as dead pixels, uneven brightness, and color shift) are prone to occur during production and use. These defects can significantly affect display quality and user experience.

[0003] In recent years, automated inspection technology based on image processing has gradually become a research hotspot. By analyzing the changes in the RGB values ​​of pixels in video frames, abnormal pixels can be identified and defect locations can be located. However, this method of abnormal pixel identification requires defect identification for every single pixel in every video frame, thus resulting in low detection efficiency. Summary of the Invention

[0004] This invention provides a method and system for appearance inspection based on Mini LED display, the main purpose of which is to improve the appearance inspection efficiency of defective pixels.

[0005] To achieve the above objectives, the present invention provides an appearance inspection method based on a Mini LED display, comprising:

[0006] The appearance inspection cycle and appearance inspection frame rate are received, and the unit frame time is calculated based on the appearance inspection frame rate, wherein the unit frame time refers to the display duration of a single video frame;

[0007] Obtain the Mini LED pixel matrix, extract the matrix pixels sequentially from the Mini LED pixel matrix, and identify the pixel coordinates of the matrix pixels;

[0008] The target phase shift of the matrix pixels is calculated based on the pixel coordinates and the preset unit phase shift.

[0009] The single-channel pixel trigonometric function of the matrix pixels is constructed based on the appearance detection period, unit frame time, and target phase shift.

[0010] The pixel display is controlled by the matrix pixels according to the single-channel pixel trigonometric function to obtain the appearance display video;

[0011] Extract the appearance detection frame sequence from the appearance display video according to the appearance detection cycle and unit frame time, and construct a single-channel pixel matrix sequence according to the appearance detection frame sequence;

[0012] The single-channel pixel matrix sequence is superimposed pixel by pixel to obtain the actual superimposed pixel matrix;

[0013] Determine whether the actual superimposed pixel matrix is ​​equal to the preset standard superimposed pixel matrix;

[0014] If the actual superimposed pixel matrix is ​​equal to the standard superimposed pixel matrix, then return to the steps of receiving the appearance detection period and appearance detection frame rate described above.

[0015] If the actual superimposed pixel matrix is ​​not equal to the standard superimposed pixel matrix, then appearance inspection is performed based on the actual superimposed pixel matrix and the standard superimposed pixel matrix to obtain abnormal pixels, thus completing the appearance inspection based on the Mini LED display.

[0016] Optionally, calculating the target phase shift of the matrix pixels based on the pixel coordinates and a preset unit phase shift includes:

[0017] Obtain the number of columns in the Mini LED pixel matrix;

[0018] Extract the row number and column number from the pixel coordinates;

[0019] Based on the number of columns, row numbers, and column numbers of the matrix, the number of phase shifts of the pixels in the matrix is ​​calculated using a pre-constructed formula for the number of phase shifts.

[0020] The target phase shift is calculated using the pre-constructed phase shift formula, the number of phase shifts, and the unit phase shift.

[0021] Optionally, the step of constructing the single-channel pixel trigonometric function of the matrix pixels based on the appearance detection period, unit frame time, and target phase shift includes:

[0022] Based on the appearance detection period, unit frame time, and target phase shift, the target amplitude is calculated using a pre-constructed amplitude formula, wherein the amplitude formula is as follows:

[0023]

[0024] in, Indicates the sign of the maximum value. Indicates the target amplitude. Indicates the amplitude parameter. Represents the sine function. Indicates the phase shift sequence number. When representing a unit frame, This represents the appearance inspection cycle, where k represents the number of video frames detected within the appearance inspection cycle. Represents pi (π). Indicates target phase shift;

[0025] The single-channel pixel trigonometric function is constructed based on the target amplitude, appearance detection period, and target phase shift.

[0026] Optionally, extracting the appearance detection frame sequence from the appearance display video based on the appearance detection period and unit frame time includes:

[0027] Based on the appearance detection cycle and unit frame time, the video frame extraction time is calculated using a pre-constructed video frame time formula, wherein the video frame time formula is as follows:

[0028]

[0029] in, This represents the extraction time of the j-th video frame;

[0030] Based on the video frame extraction time, appearance detection video frames are extracted from the appearance display video to obtain the appearance detection frame sequence.

[0031] Optionally, constructing a single-channel pixel matrix sequence based on the appearance detection frame order includes:

[0032] The video frames to be processed are extracted sequentially from the appearance detection frame sequence;

[0033] Determine the pixel coordinate matrix based on the Mini LED pixel matrix;

[0034] Based on each pixel coordinate in the pixel coordinate matrix, a single-channel pixel value is extracted from the video frame to be processed and detected to obtain a single-channel pixel value set.

[0035] Arrange the single-channel pixel value set according to the pixel coordinate matrix to obtain a single-channel pixel matrix;

[0036] The single-channel pixel matrices of each video frame to be processed are combined to obtain a single-channel pixel matrix sequence.

[0037] Optionally, the step of superimposing the single-channel pixel matrix sequence pixel by pixel to obtain the actual superimposed pixel matrix includes:

[0038] Pixel coordinates are extracted sequentially from the pixel coordinate matrix, and the actual single-channel pixel value sequence corresponding to the pixel coordinates is extracted from the single-channel pixel matrix sequence.

[0039] Using a pre-constructed actual pixel overlay formula, the actual overlay pixel value of the pixel coordinates is calculated based on the actual single-channel pixel value sequence.

[0040] The actual superimposed pixel values ​​are arranged according to the pixel coordinates to obtain the actual superimposed pixel matrix.

[0041] Optionally, before determining whether the actual superimposed pixel matrix is ​​equal to the preset standard superimposed pixel matrix, the method further includes:

[0042] The standard single-channel pixel value sequence for calculating pixel coordinates is obtained using the single-channel pixel trigonometric function.

[0043] Using a pre-constructed standard pixel overlay formula, the standard overlay pixel value of the pixel coordinates is calculated based on the standard single-channel pixel value sequence.

[0044] The standard superimposed pixel values ​​are arranged according to the pixel coordinates to obtain a standard superimposed pixel matrix.

[0045] Optionally, the step of performing appearance detection based on the actual superimposed pixel matrix and the standard superimposed pixel matrix to obtain appearance-detected abnormal pixels includes:

[0046] The actual superimposed pixel matrix and the standard superimposed pixel matrix are compared to obtain the coordinates of the differing pixels.

[0047] Identify the appearance detection abnormal pixels corresponding to the differential pixel coordinates in the Mini LED pixel matrix.

[0048] Optionally, after performing appearance detection based on the actual superimposed pixel matrix and the standard superimposed pixel matrix, the method further includes:

[0049] Extract the actual difference pixel value corresponding to the difference pixel coordinates from the actual superimposed pixel matrix;

[0050] Extract the standard difference pixel value corresponding to the difference pixel coordinate in the standard superimposed pixel matrix;

[0051] The detection anomaly evaluation value of the appearance detection anomaly pixel is calculated using a pre-constructed pixel detection evaluation formula based on the actual difference pixel value and the standard difference pixel value.

[0052] To achieve the above objectives, the present invention also provides an appearance inspection system based on a Mini LED display, comprising:

[0053] A single-channel pixel trigonometric function construction module is used to receive the appearance detection period and appearance detection frame rate, calculate the unit frame time based on the appearance detection frame rate, wherein the unit frame time refers to the display duration of a single video frame; obtain a MiniLED pixel matrix, extract matrix pixels sequentially from the MiniLED pixel matrix, and identify the pixel coordinates of the matrix pixels; calculate the target phase shift of the matrix pixels based on the pixel coordinates and a preset unit phase shift; and construct a single-channel pixel trigonometric function for the matrix pixels based on the appearance detection period, unit frame time, and target phase shift.

[0054] A single-channel pixel matrix sequence construction module is used to perform pixel display control on the matrix pixels according to the single-channel pixel trigonometric function to obtain an appearance display video; extract the appearance detection frame sequence from the appearance display video according to the appearance detection period and unit frame time, and construct a single-channel pixel matrix sequence according to the appearance detection frame sequence.

[0055] The actual superimposed pixel matrix calculation module is used to superimpose the single-channel pixel matrix sequence pixel by pixel to obtain the actual superimposed pixel matrix.

[0056] The appearance detection abnormal pixel identification module is used to determine whether the actual superimposed pixel matrix is ​​equal to the preset standard superimposed pixel matrix; if the actual superimposed pixel matrix is ​​equal to the standard superimposed pixel matrix, the steps of receiving the appearance detection period and appearance detection frame rate mentioned above are returned; if the actual superimposed pixel matrix is ​​not equal to the standard superimposed pixel matrix, appearance detection is performed based on the actual superimposed pixel matrix and the standard superimposed pixel matrix to obtain the appearance detection abnormal pixels.

[0057] To address the above problems, the present invention also provides an electronic device, the electronic device comprising:

[0058] A memory that stores at least one instruction; and a processor that executes the instructions stored in the memory to implement the aforementioned appearance detection method based on a Mini LED display.

[0059] To address the aforementioned problems, the present invention also provides a computer-readable storage medium storing at least one instruction, which is executed by a processor in an electronic device to implement the aforementioned appearance detection method based on a Mini LED display.

[0060] To address the problems described in the background art, this invention firstly requires constructing a single-channel pixel trigonometric function to achieve pixel display control of the matrix pixels. During the construction of this function, the appearance detection period and frame rate need to be received first, and the unit frame time is calculated based on the frame rate. Here, the unit frame time refers to the display duration of a single video frame. At this point, the Mini LED pixel matrix can be obtained. To achieve independent pixel display control of each matrix pixel in the Mini LED pixel matrix, the Mini LED pixel matrix is ​​first... Matrix pixels are extracted sequentially from the LED pixel matrix, and their pixel coordinates are identified. To prevent different matrix pixels from displaying the same pixel value at the same time, the target phase shift of the matrix pixels needs to be calculated based on the pixel coordinates and a preset unit phase shift. Then, a single-channel pixel trigonometric function is constructed based on the appearance detection period, unit frame time, and target phase shift. At this point, the pixel display can be adjusted based on the single-channel pixel trigonometric function to obtain the appearance display video. To improve the recognition efficiency of abnormal pixels in appearance detection, the abnormal pixels can be identified by superimposing the same pixels. Since the appearance detection frame sequence needs to be extracted frame by frame, the appearance detection frame sequence can be extracted from the appearance display video based on the appearance detection period and unit frame time. Then, a single-channel pixel matrix sequence is constructed based on the appearance detection frame sequence. At this point, the single-channel pixel matrix sequence can be superimposed with the same pixels to obtain the actual superimposed pixel matrix. By determining whether the actual superimposed pixel matrix is ​​equal to the preset standard superimposed pixel matrix, the Mini... If the actual superimposed pixel matrix is ​​equal to the standard superimposed pixel matrix, the display is considered normal, and the process returns to the steps of receiving the appearance inspection cycle and frame rate. If the actual superimposed pixel matrix is ​​not equal to the standard superimposed pixel matrix, then there are abnormal pixels. Appearance inspection can be performed based on the actual superimposed pixel matrix and the standard superimposed pixel matrix to identify the abnormal pixels. Therefore, this invention can improve the appearance inspection efficiency of defective pixels. Attached Figure Description

[0061] Figure 1 This is a flowchart illustrating an appearance inspection method based on a Mini LED display according to an embodiment of the present invention.

[0062] Figure 2 This is a functional block diagram of an appearance inspection system based on a Mini LED display provided in an embodiment of the present invention;

[0063] Figure 3 This is a schematic diagram of the structure of an electronic device that implements the appearance inspection method based on Mini LED display according to an embodiment of the present invention.

[0064] Explanation of reference numerals in the attached figures:

[0065] 10. Electronic device; 11. Processor; 12. Memory; 13. Bus.

[0066] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0067] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0068] This application provides an appearance inspection method based on a Mini LED display. The execution entity of the appearance inspection method based on a Mini LED display includes, but is not limited to, at least one of the following electronic devices that can be configured to execute the method provided in this application: a server, a terminal, etc. In other words, the appearance inspection method based on a Mini LED display can be executed by software or hardware installed on a terminal device or a server device, and the software can be a blockchain platform. The server includes, but is not limited to, a single server, a server cluster, a cloud server, or a cloud server cluster.

[0069] Reference Figure 1 The diagram shown is a flowchart illustrating an appearance inspection method based on a Mini LED display according to an embodiment of the present invention. In this embodiment, the appearance inspection method based on a Mini LED display includes:

[0070] S1. Receive the appearance detection cycle and appearance detection frame rate, and calculate the unit frame time based on the appearance detection frame rate, wherein the unit frame time refers to the display duration of a single video frame.

[0071] Explained, the appearance detection cycle refers to the period for detecting the display pixels of the Mini LED, for example: 2 hours. The appearance detection frame rate refers to the frequency at which the Mini LED display video frames are acquired, for example: 120Hz, indicating that 120 video frames are displayed per second. When the appearance detection frame rate is 120Hz, the unit frame time is... ms.

[0072] S2. Obtain the Mini LED pixel matrix, extract the matrix pixels sequentially from the Mini LED pixel matrix, and identify the pixel coordinates of the matrix pixels.

[0073] Explained, the Mini LED pixel matrix refers to a matrix array composed of pixels (i.e., Mini LED chips) of a Mini LED display. The matrix pixel refers to a pixel within the Mini LED pixel matrix. The pixel coordinates refer to the coordinates of the matrix pixel within the Mini LED pixel matrix. For example, if a Mini LED display has 2028 horizontal pixel rows and 1142 vertical pixel columns, then the matrix pixel could be the pixel in the 100th row and 100th column, with pixel coordinates of (100, 100).

[0074] S3. Calculate the target phase shift of the matrix pixels based on the pixel coordinates and the preset unit phase shift.

[0075] Furthermore, the unit phase shift refers to the phase difference between adjacent matrix pixels during the process of traversing the Mini LED pixel matrix in a left-to-right and top-to-bottom order, and the target phase shift refers to the phase offset value of the pixel value of the matrix pixel, as detailed in the following embodiments.

[0076] In this embodiment of the invention, calculating the target phase shift of the matrix pixels based on the pixel coordinates and a preset unit phase shift includes:

[0077] Obtain the number of columns in the Mini LED pixel matrix;

[0078] Extract the row number and column number from the pixel coordinates;

[0079] Based on the number of columns, row numbers, and column numbers of the matrix, the phase shift count of the matrix pixels is calculated using a pre-constructed phase shift count formula, wherein the phase shift count formula is as follows:

[0080]

[0081] in, Indicates the number of phase shifts. Indicates the number of columns in the matrix. Indicates the row number of the coordinates. Indicates the column number of the coordinates;

[0082] Based on the pre-constructed phase shift formula, the target phase shift is calculated using the phase shift number and the unit phase shift, wherein the phase shift formula is as follows:

[0083]

[0084] in, Indicates target phase shift, Indicates the remainder symbol. Indicates unit phase shift, It represents pi (π).

[0085] Understandably, when the number of columns in the matrix is ​​1142, the row number of the coordinate is 500, and the column number of the coordinate is 100, then the number of phase shifts is... =569957; When the number of columns in the matrix is ​​1142, the row number of the coordinate is 500, and the column number of the coordinate is 80, then the number of phase shifts is =569937.

[0086] Further, the number of matrix columns refers to the number of vertical pixel columns in the Mini LED pixel matrix, the coordinate row number refers to the row number in the pixel coordinates, and the coordinate column number refers to the column number in the pixel coordinates. For example, when the pixel coordinates are (100, 200), the coordinate row number is 100 and the coordinate column number is 200. The number of phase shifts refers to the number of phase shifts of the matrix pixel relative to the pixel in the first row and first column of the Mini LED pixel matrix.

[0087] For example, when the unit phase shift is When the phase shift count is 2000, the target phase shift is equal to When the unit phase shift is When the phase shift count is 2200, the target phase shift is equal to .

[0088] S4. Construct the single-channel pixel trigonometric function of the matrix pixels based on the appearance detection period, unit frame time, and target phase shift.

[0089] Explained, the single-channel pixel trigonometric function refers to the trigonometric function that controls the single-channel pixel value of the matrix pixel. Each matrix pixel in the Mini LED pixel matrix has three color channels: R, G, and B. For ease of calculation, in this embodiment of the invention, pixel control is performed on only one color channel (single channel). For example, when the single channel is the R channel, the pixel value of the matrix pixel can change from (100, 0, 0) to (200, 0, 0); when the single channel is the G channel, the pixel value of the matrix pixel can change from (0, 100, 0) to (0, 200, 0); and when the single channel is the B channel, the pixel value of the matrix pixel can change from (0, 0, 100) to (0, 0, 200). This embodiment of the invention controls the pixel value of the color channel based on the single-channel pixel trigonometric function.

[0090] In this embodiment of the invention, the step of constructing the single-channel pixel trigonometric function of the matrix pixels based on the appearance detection period, unit frame time, and target phase shift includes:

[0091] Based on the appearance detection period, unit frame time, and target phase shift, the target amplitude is calculated using a pre-constructed amplitude formula, wherein the amplitude formula is as follows:

[0092]

[0093] in, Indicates the sign of the maximum value. Indicates the target amplitude. Indicates the amplitude parameter. Represents the sine function. Indicates the phase shift sequence number. When representing a unit frame, This represents the appearance inspection cycle, and k represents the number of periodic inspection video frames within the appearance inspection cycle.

[0094] The single-channel pixel trigonometric function is constructed based on the target amplitude, appearance detection period, and target phase shift, wherein the single-channel pixel trigonometric function is as follows:

[0095]

[0096] in, Indicates the single-channel pixel value. Indicates time.

[0097] Understandably, the target amplitude refers to the amplitude of the single-channel pixel trigonometric function. Once the appearance detection period, unit frame time, and target phase shift are determined, the single-channel pixel values ​​corresponding to multiple unit frame times within the appearance detection period can be superimposed to obtain the superimposed pixel value of the single-channel pixel values ​​within the appearance detection period. Since the range of single-channel pixel values ​​is between 0 and 255, and the superimposed pixel value may exceed 255, causing pixel value overflow, it is necessary to use the amplitude formula to limit the superimposed pixel value to within 255, and then use the amplitude formula to solve for the maximum amplitude to obtain the target amplitude.

[0098] For example, when the target amplitude is 10, the appearance detection cycle is 60 minutes, and the target phase shift is... At that time, the single-channel pixel value is , Possible values , , , , Then we can obtain j single-channel pixel values, where This indicates the video frame extraction time, as detailed in the following example.

[0099] S5. Perform pixel display control on the matrix pixels according to the single-channel pixel trigonometric function to obtain the appearance display video.

[0100] Furthermore, the aforementioned appearance display video refers to the pixel value adjustment of the matrix pixels using the single-channel pixel trigonometric functions corresponding to each matrix pixel, thereby obtaining the display video. To mimic the daily working state of a Mini LED display screen, the target phase shift is used to differentiate the pixel values ​​of each matrix pixel, thereby improving the applicability of the test.

[0101] S6. Extract the appearance detection frame sequence from the appearance display video according to the appearance detection period and unit frame time, and construct a single-channel pixel matrix sequence according to the appearance detection frame sequence.

[0102] Further, the appearance detection frame sequence refers to the sequence of appearance detection video frames. The single-channel pixel matrix sequence refers to the sequence of single-channel pixel matrices constructed based on the pixel values ​​of each matrix pixel in the appearance detection video frames. The appearance detection video frames refer to the video frames extracted from the appearance display video for Mini LED pixel detection.

[0103] In this embodiment of the invention, extracting the appearance detection frame sequence from the appearance display video based on the appearance detection period and unit frame time includes:

[0104] Based on the appearance detection cycle and unit frame time, the video frame extraction time is calculated using a pre-constructed video frame time formula, wherein the video frame time formula is as follows:

[0105]

[0106] in, This represents the extraction time of the j-th video frame;

[0107] Based on the video frame extraction time, appearance detection video frames are extracted from the appearance display video to obtain the appearance detection frame sequence.

[0108] Explained, the video frame extraction time refers to the time taken to extract each appearance detection video frame in the appearance detection frame sequence.

[0109] For example, when the unit frame is When the display time is ms, the starting display time of the first appearance detection video frame is 0ms, the starting display time of the second appearance detection video frame is 8ms, and the starting display time of the third appearance detection video frame is 16ms. Therefore, the extraction time of the first appearance detection video frame can be 4ms, the extraction time of the second appearance detection video frame can be 12ms, and the extraction time of the third appearance detection video frame can be 20ms, that is, the extraction is performed in the middle of the display time of the appearance detection video frame.

[0110] In this embodiment of the invention, constructing a single-channel pixel matrix sequence based on the appearance detection frame sequence includes:

[0111] The video frames to be processed are extracted sequentially from the appearance detection frame sequence;

[0112] Determine the pixel coordinate matrix based on the Mini LED pixel matrix;

[0113] Based on each pixel coordinate in the pixel coordinate matrix, a single-channel pixel value is extracted from the video frame to be processed and detected to obtain a single-channel pixel value set.

[0114] Arrange the single-channel pixel value set according to the pixel coordinate matrix to obtain a single-channel pixel matrix;

[0115] The single-channel pixel matrices of each video frame to be processed are combined to obtain a single-channel pixel matrix sequence.

[0116] Explained, the "to-be-processed detection video frame" refers to the appearance detection video frame in the appearance detection frame sequence that is waiting to be converted into a single-channel pixel matrix. The "pixel coordinate matrix" refers to the matrix composed of each pixel in the appearance detection video frame. When the Mini LED display screen has 2028 horizontal pixel rows and 1142 vertical pixel columns, the single-channel pixel matrix also has 2028 matrix rows and 1142 matrix columns. The Mini LED pixel matrix of the Mini LED display screen corresponds to the single-channel pixel matrix.

[0117] S7. The single-channel pixel matrix sequence is superimposed with the same pixel to obtain the actual superimposed pixel matrix.

[0118] Explained, the term "pixel overlay" refers to the superposition of single-channel pixel values ​​from the same matrix. The term "actual overlay pixel matrix" refers to the actual pixel overlay matrix of each single-channel pixel matrix during pixel display adjustment within an appearance inspection cycle.

[0119] In this embodiment of the invention, the step of performing pixel-by-pixel superposition on the single-channel pixel matrix sequence to obtain the actual superimposed pixel matrix includes:

[0120] Pixel coordinates are extracted sequentially from the pixel coordinate matrix, and the actual single-channel pixel value sequence corresponding to the pixel coordinates is extracted from the single-channel pixel matrix sequence.

[0121] Using a pre-constructed actual pixel overlay formula, the actual overlay pixel value of the pixel coordinates is calculated based on the actual single-channel pixel value sequence, wherein the actual pixel overlay formula is as follows:

[0122]

[0123] in, Indicates the actual superimposed pixel value. This represents the actual single-channel pixel value of the pixel coordinates in the j-th appearance detection video frame;

[0124] The actual superimposed pixel values ​​are arranged according to the pixel coordinates to obtain the actual superimposed pixel matrix.

[0125] Explained, the actual single-channel pixel value sequence refers to the sequence of single-channel pixel values ​​corresponding to the extraction time of each video frame within the appearance detection period. The actual superimposed pixel value refers to the superimposed value of the actual single-channel pixel values ​​of the same matrix pixel within the appearance detection period.

[0126] For example, when the appearance detection period is 10 minutes and the unit frame time is 10 ms, the number of appearance detection video frames is: At this time, the actual superimposed pixel values ​​are the appearance detection video frame at 5ms, the appearance detection video frame at 10ms, and the appearance detection video frame at 15ms. , No. The appearance detection video frame is the sum of the actual single-channel pixel values ​​of the pixel coordinates.

[0127] S8. Determine whether the actual superimposed pixel matrix is ​​equal to the preset standard superimposed pixel matrix.

[0128] It should be understood that the standard overlay pixel matrix refers to the standardized pixel overlay matrix obtained after overlaying the same pixels under normal display conditions.

[0129] In this embodiment of the invention, before determining whether the actual superimposed pixel matrix is ​​equal to the preset standard superimposed pixel matrix, the method further includes:

[0130] Using the single-channel pixel trigonometric function, the standard single-channel pixel value sequence of pixel coordinates is calculated using the following formula:

[0131]

[0132] in, This represents the j-th standard single-channel pixel value at the pixel coordinate;

[0133] Using a pre-constructed standard pixel overlay formula, the standard overlay pixel value of the pixel coordinates is calculated based on the standard single-channel pixel value sequence, wherein the standard pixel overlay formula is as follows:

[0134]

[0135] in, Represents the standard overlay pixel values. The standard single-channel pixel value representing the pixel coordinates in the j-th appearance detection video frame;

[0136] The standard superimposed pixel values ​​are arranged according to the pixel coordinates to obtain a standard superimposed pixel matrix.

[0137] For example, when the target amplitude is 10, the appearance detection cycle is 10 minutes, and the target phase shift is... The extraction time for the first appearance detection video frame can be 4ms, the extraction time for the second appearance detection video frame can be 12ms, the extraction time for the third appearance detection video frame can be 20ms, and the extraction time for the fourth appearance detection video frame can be 28ms. Therefore, the pixel value of the first standard channel is... The second standard channel pixel value is The third standard channel pixel value is The fourth standard channel pixel value is .

[0138] Understandably, the standard single-channel pixel value sequence refers to the sequence of standard single-channel pixel values ​​corresponding to the extraction time of each video frame within the appearance inspection cycle under normal display conditions. The standard superimposed pixel value refers to the superimposed value of the standard single-channel pixel values ​​of the same matrix pixel within the appearance inspection cycle.

[0139] For example, when the first standard channel pixel value is The second standard channel pixel value is The third standard channel pixel value is The fourth standard channel pixel value is At that time, the first 4 standard single-channel pixel values ​​are superimposed as the standard superimposed pixel values, and so on.

[0140] If the actual superimposed pixel matrix is ​​equal to the standard superimposed pixel matrix, then return to the steps of receiving the appearance detection period and appearance detection frame rate described above.

[0141] Understandably, when the actual superimposed pixel matrix is ​​equal to the standard superimposed pixel matrix, it means that the Mini LED display meets the standard within the appearance detection cycle. Therefore, the next round of detection can continue. The appearance detection cycle can be adjusted, and then the steps of receiving the appearance detection cycle and appearance detection frame rate can be returned to above.

[0142] If the actual superimposed pixel matrix is ​​not equal to the standard superimposed pixel matrix, then execute S9, perform appearance detection based on the actual superimposed pixel matrix and the standard superimposed pixel matrix, obtain abnormal pixels, and complete the appearance detection based on MiniLED display.

[0143] Understandably, the abnormal pixel in appearance detection refers to a matrix pixel in the Mini LED pixel matrix that has abnormal display.

[0144] In this embodiment of the invention, the step of performing appearance detection based on the actual superimposed pixel matrix and the standard superimposed pixel matrix to obtain abnormal pixels includes:

[0145] The actual superimposed pixel matrix and the standard superimposed pixel matrix are compared to obtain the coordinates of the differing pixels.

[0146] Identify the appearance detection abnormal pixels corresponding to the differential pixel coordinates in the Mini LED pixel matrix.

[0147] Understandably, the difference pixel coordinates refer to the pixel coordinates corresponding to matrix pixels with different superimposed pixel values ​​in the actual superimposed pixel matrix and the standard superimposed pixel matrix.

[0148] In this embodiment of the invention, after performing appearance detection based on the actual superimposed pixel matrix and the standard superimposed pixel matrix, the method further includes:

[0149] Extract the actual difference pixel value corresponding to the difference pixel coordinates from the actual superimposed pixel matrix;

[0150] Extract the standard difference pixel value corresponding to the difference pixel coordinate in the standard superimposed pixel matrix;

[0151] The detection anomaly evaluation value of the appearance detection anomaly pixels is calculated using a pre-constructed pixel detection evaluation formula based on the actual difference pixel value and the standard difference pixel value, wherein the pixel detection evaluation formula is as follows:

[0152]

[0153] in, This indicates the anomaly assessment value. Indicates the actual difference in pixel values. This represents the standard difference pixel value, and the absolute value sign is indicated by the symbol.

[0154] Understandably, the actual difference pixel value refers to the actual superimposed pixel value corresponding to the difference pixel coordinates in the actual superimposed pixel matrix, and the standard difference pixel value refers to the standard superimposed pixel value corresponding to the difference pixel coordinates in the standard superimposed pixel matrix. The detection anomaly evaluation value refers to the evaluation value of the degree of anomaly of the appearance detection anomaly pixel; the larger the detection anomaly evaluation value, the more serious the fault of the appearance detection anomaly pixel.

[0155] To address the problems described in the background art, this invention firstly requires constructing a single-channel pixel trigonometric function to achieve pixel display control of the matrix pixels. During the construction of this function, the appearance detection period and frame rate need to be received first, and the unit frame time is calculated based on the frame rate. Here, the unit frame time refers to the display duration of a single video frame. At this point, the Mini LED pixel matrix can be obtained. To achieve independent pixel display control of each matrix pixel in the Mini LED pixel matrix, the Mini LED pixel matrix is ​​first... Matrix pixels are extracted sequentially from the LED pixel matrix, and their pixel coordinates are identified. To prevent different matrix pixels from displaying the same pixel value at the same time, the target phase shift of the matrix pixels needs to be calculated based on the pixel coordinates and a preset unit phase shift. Then, a single-channel pixel trigonometric function is constructed based on the appearance detection period, unit frame time, and target phase shift. At this point, the pixel display can be adjusted based on the single-channel pixel trigonometric function to obtain the appearance display video. To improve the recognition efficiency of abnormal pixels in appearance detection, the abnormal pixels can be identified by superimposing the same pixels. Since the appearance detection frame sequence needs to be extracted frame by frame, the appearance detection frame sequence can be extracted from the appearance display video based on the appearance detection period and unit frame time. Then, a single-channel pixel matrix sequence is constructed based on the appearance detection frame sequence. At this point, the single-channel pixel matrix sequence can be superimposed with the same pixels to obtain the actual superimposed pixel matrix. By determining whether the actual superimposed pixel matrix is ​​equal to the preset standard superimposed pixel matrix, the Mini... If the actual superimposed pixel matrix is ​​equal to the standard superimposed pixel matrix, the display is considered normal, and the process returns to the steps of receiving the appearance inspection cycle and frame rate. If the actual superimposed pixel matrix is ​​not equal to the standard superimposed pixel matrix, then there are abnormal pixels. Appearance inspection can be performed based on the actual superimposed pixel matrix and the standard superimposed pixel matrix to identify the abnormal pixels. Therefore, this invention can improve the appearance inspection efficiency of defective pixels.

[0156] like Figure 2The diagram shown is a functional block diagram of an appearance inspection system based on a Mini LED display provided in an embodiment of the present invention.

[0157] The Mini LED display-based appearance inspection system 100 of this invention can be installed in an electronic device. Depending on the functions implemented, the Mini LED display-based appearance inspection system 100 may include a single-channel pixel trigonometric function construction module 101, a single-channel pixel matrix sequence construction module 102, an actual superimposed pixel matrix calculation module 103, and an appearance inspection abnormal pixel recognition module 104. The module described in this invention can also be called a unit, referring to a series of computer program segments that can be executed by the processor of an electronic device and can perform a fixed function, stored in the memory of the electronic device.

[0158] The single-channel pixel trigonometric function construction module 101 is used to receive the appearance detection period and appearance detection frame rate, calculate the unit frame time based on the appearance detection frame rate, wherein the unit frame time refers to the display duration of a single video frame; obtain the Mini LED pixel matrix, extract matrix pixels sequentially from the Mini LED pixel matrix, and identify the pixel coordinates of the matrix pixels; calculate the target phase shift of the matrix pixels based on the pixel coordinates and a preset unit phase shift; and construct the single-channel pixel trigonometric function of the matrix pixels based on the appearance detection period, unit frame time, and target phase shift.

[0159] The single-channel pixel matrix sequence construction module 102 is used to perform pixel display control on the matrix pixels according to the single-channel pixel trigonometric function to obtain an appearance display video; extract the appearance detection frame sequence from the appearance display video according to the appearance detection period and unit frame time, and construct a single-channel pixel matrix sequence according to the appearance detection frame sequence.

[0160] The actual superimposed pixel matrix calculation module 103 is used to superimpose the single-channel pixel matrix sequence with the same pixel to obtain the actual superimposed pixel matrix.

[0161] The appearance detection abnormal pixel identification module 104 is used to determine whether the actual superimposed pixel matrix is ​​equal to the preset standard superimposed pixel matrix; if the actual superimposed pixel matrix is ​​equal to the standard superimposed pixel matrix, then return to the above steps of receiving the appearance detection period and appearance detection frame rate; if the actual superimposed pixel matrix is ​​not equal to the standard superimposed pixel matrix, then perform appearance detection based on the actual superimposed pixel matrix and the standard superimposed pixel matrix to obtain the appearance detection abnormal pixels.

[0162] In detail, the modules in the Mini LED display-based appearance inspection system 100 described in this embodiment of the invention employ the same methods as described above. Figure 1The same technical means are used in the appearance inspection method based on Mini LED display described above, and it can produce the same technical effect, so it will not be repeated here.

[0163] like Figure 3 The diagram shown is a structural schematic of an electronic device that implements an appearance inspection method based on a Mini LED display, according to an embodiment of the present invention.

[0164] The electronic device 1 may include a processor 10, a memory 11 and a bus 12, and may also include a computer program stored in the memory 11 and executable on the processor 10, such as a Mini LED display-based appearance inspection method program.

[0165] The memory 11 includes at least one type of readable storage medium, such as flash memory, portable hard drive, multimedia card, card-type memory (e.g., SD or DX memory), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory 11 can be an internal storage unit of the electronic device 1, such as a portable hard drive. In other embodiments, the memory 11 can be an external storage device of the electronic device 1, such as a plug-in portable hard drive, smart media card (SMC), secure digital card (SD), flash card, etc., equipped on the electronic device 1. Furthermore, the memory 11 includes both internal storage units and external storage devices of the electronic device 1. The memory 11 can be used not only to store application software and various types of data installed on the electronic device 1, such as the code of a Mini LED display appearance inspection method program, but also to temporarily store data that has been output or will be output.

[0166] In some embodiments, the processor 10 may be composed of integrated circuits, such as a single packaged integrated circuit or multiple integrated circuits with the same or different functions, including combinations of one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips. The processor 10 is the control unit of the electronic device, connecting various components of the entire electronic device through various interfaces and lines. It executes programs or modules stored in the memory 11 (e.g., a method for appearance detection based on Mini LED displays) and calls data stored in the memory 11 to perform various functions of the electronic device 1 and process data.

[0167] The bus 12 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus 12 can be divided into an address bus, a data bus, a control bus, etc. The bus 12 is configured to realize the connection and communication between the memory 11 and at least one processor 10, etc.

[0168] Figure 3 Only electronic devices with components are shown; it will be understood by those skilled in the art that... Figure 3 The structure shown does not constitute a limitation on the electronic device 1, and may include fewer or more components than shown, or combine certain components, or have different component arrangements.

[0169] For example, although not shown, the electronic device 1 may also include a power supply (such as a battery) to power the various components. Preferably, the power supply can be logically connected to the at least one processor 10 through a power management device, thereby enabling functions such as charging management, discharging management, and power consumption management. The power supply may also include one or more DC or AC power supplies, recharging devices, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components. The electronic device 1 may also include various sensors, Bluetooth modules, Wi-Fi modules, etc., which will not be described in detail here.

[0170] Furthermore, the electronic device 1 may also include a network interface. Optionally, the network interface may include a wired interface and / or a wireless interface (such as a Wi-Fi interface, a Bluetooth interface, etc.), which is typically used to establish communication connections between the electronic device 1 and other electronic devices.

[0171] Optionally, the electronic device 1 may further include a user interface, which may be a display, an input unit (such as a keyboard), and optionally, a standard wired interface or a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen, etc. The display may also be appropriately referred to as a screen or display unit, used to display information processed in the electronic device 1 and to display a visual user interface.

[0172] The appearance detection method program based on Mini LED display stored in the memory 11 of the electronic device 1 is a combination of multiple instructions, which, when run in the processor 10, can achieve the following:

[0173] The appearance inspection cycle and appearance inspection frame rate are received, and the unit frame time is calculated based on the appearance inspection frame rate, wherein the unit frame time refers to the display duration of a single video frame;

[0174] Obtain the Mini LED pixel matrix, extract the matrix pixels sequentially from the Mini LED pixel matrix, and identify the pixel coordinates of the matrix pixels;

[0175] The target phase shift of the matrix pixels is calculated based on the pixel coordinates and the preset unit phase shift.

[0176] The single-channel pixel trigonometric function of the matrix pixels is constructed based on the appearance detection period, unit frame time, and target phase shift.

[0177] The pixel display is controlled by the matrix pixels according to the single-channel pixel trigonometric function to obtain the appearance display video;

[0178] Extract the appearance detection frame sequence from the appearance display video according to the appearance detection cycle and unit frame time, and construct a single-channel pixel matrix sequence according to the appearance detection frame sequence;

[0179] The single-channel pixel matrix sequence is superimposed pixel by pixel to obtain the actual superimposed pixel matrix;

[0180] Determine whether the actual superimposed pixel matrix is ​​equal to the preset standard superimposed pixel matrix;

[0181] If the actual superimposed pixel matrix is ​​equal to the standard superimposed pixel matrix, then return to the steps of receiving the appearance detection period and appearance detection frame rate described above.

[0182] If the actual superimposed pixel matrix is ​​not equal to the standard superimposed pixel matrix, then appearance detection is performed based on the actual superimposed pixel matrix and the standard superimposed pixel matrix to obtain abnormal pixels and complete the appearance detection based on Mini LED display.

[0183] Specifically, the processor 10's implementation method for the above instructions can be found in [reference needed]. Figures 1 to 3 The descriptions of the relevant steps in the corresponding embodiments are not repeated here.

[0184] Furthermore, if the modules / units integrated in the electronic device 1 are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. The computer-readable storage medium can be volatile or non-volatile. For example, the computer-readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, or a read-only memory (ROM).

[0185] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor of an electronic device, can perform the following:

[0186] The appearance inspection cycle and appearance inspection frame rate are received, and the unit frame time is calculated based on the appearance inspection frame rate, wherein the unit frame time refers to the display duration of a single video frame;

[0187] Obtain the Mini LED pixel matrix, extract the matrix pixels sequentially from the Mini LED pixel matrix, and identify the pixel coordinates of the matrix pixels;

[0188] The target phase shift of the matrix pixels is calculated based on the pixel coordinates and the preset unit phase shift.

[0189] The single-channel pixel trigonometric function of the matrix pixels is constructed based on the appearance detection period, unit frame time, and target phase shift.

[0190] The pixel display is controlled by the matrix pixels according to the single-channel pixel trigonometric function to obtain the appearance display video;

[0191] Extract the appearance detection frame sequence from the appearance display video according to the appearance detection cycle and unit frame time, and construct a single-channel pixel matrix sequence according to the appearance detection frame sequence;

[0192] The single-channel pixel matrix sequence is superimposed pixel by pixel to obtain the actual superimposed pixel matrix;

[0193] Determine whether the actual superimposed pixel matrix is ​​equal to the preset standard superimposed pixel matrix;

[0194] If the actual superimposed pixel matrix is ​​equal to the standard superimposed pixel matrix, then return to the steps of receiving the appearance detection period and appearance detection frame rate described above.

[0195] If the actual superimposed pixel matrix is ​​not equal to the standard superimposed pixel matrix, then appearance detection is performed based on the actual superimposed pixel matrix and the standard superimposed pixel matrix to obtain abnormal pixels and complete the appearance detection based on Mini LED display.

[0196] In the embodiments provided by this invention, it should be understood that the disclosed devices, systems, and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative, and actual implementations may have other classification methods.

[0197] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0198] Furthermore, the functional modules in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in the form of hardware plus software functional modules.

[0199] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0200] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for appearance inspection based on Mini LED displays, characterized in that, The method includes: The appearance inspection cycle and appearance inspection frame rate are received, and the unit frame time is calculated based on the appearance inspection frame rate, wherein the unit frame time refers to the display duration of a single video frame; Obtain the Mini LED pixel matrix, extract the matrix pixels sequentially from the Mini LED pixel matrix, and identify the pixel coordinates of the matrix pixels; The target phase shift of the matrix pixels is calculated based on the pixel coordinates and the preset unit phase shift. The single-channel pixel trigonometric function of the matrix pixels is constructed based on the appearance detection period, unit frame time, and target phase shift. The pixel display is controlled by the matrix pixels according to the single-channel pixel trigonometric function to obtain the appearance display video; Extract the appearance detection frame sequence from the appearance display video according to the appearance detection cycle and unit frame time, and construct a single-channel pixel matrix sequence according to the appearance detection frame sequence; The single-channel pixel matrix sequence is superimposed pixel by pixel to obtain the actual superimposed pixel matrix; Determine whether the actual superimposed pixel matrix is ​​equal to the preset standard superimposed pixel matrix; If the actual superimposed pixel matrix is ​​equal to the standard superimposed pixel matrix, then return to the steps of receiving the appearance detection period and appearance detection frame rate described above. If the actual superimposed pixel matrix is ​​not equal to the standard superimposed pixel matrix, then appearance detection is performed based on the actual superimposed pixel matrix and the standard superimposed pixel matrix to obtain abnormal pixels and complete the appearance detection based on Mini LED display. The step of calculating the target phase shift of the matrix pixels based on the pixel coordinates and a preset unit phase shift includes: Obtain the number of columns in the Mini LED pixel matrix; Extract the row number and column number from the pixel coordinates; Based on the number of columns, row numbers, and column numbers of the matrix, the number of phase shifts of the pixels in the matrix is ​​calculated using a pre-constructed formula for the number of phase shifts. The target phase shift is calculated using the pre-constructed phase shift formula, the number of phase shifts, and the unit phase shift.

2. The appearance inspection method based on Mini LED display as described in claim 1, characterized in that, The step of constructing the single-channel pixel trigonometric function of the matrix pixels based on the appearance detection period, unit frame time, and target phase shift includes: Based on the appearance detection period, unit frame time, and target phase shift, the target amplitude is calculated using a pre-constructed amplitude formula, wherein the amplitude formula is as follows: in, Indicates the sign of the maximum value. Indicates the target amplitude. Indicates the amplitude parameter. Represents the sine function. Indicates the phase shift sequence number. When representing a unit frame, This represents the appearance inspection cycle, where k represents the number of video frames detected within the appearance inspection cycle. Represents pi (π). Indicates target phase shift; The single-channel pixel trigonometric function is constructed based on the target amplitude, appearance detection period, and target phase shift.

3. The appearance inspection method based on Mini LED display as described in claim 2, characterized in that, Extracting the appearance detection frame sequence from the appearance display video based on the appearance detection period and unit frame includes: Based on the appearance detection cycle and unit frame time, the video frame extraction time is calculated using a pre-constructed video frame time formula, wherein the video frame time formula is as follows: in, This represents the extraction time of the j-th video frame; Based on the video frame extraction time, appearance detection video frames are extracted from the appearance display video to obtain the appearance detection frame sequence.

4. The appearance inspection method based on Mini LED display as described in claim 3, characterized in that, The step of constructing a single-channel pixel matrix sequence based on the appearance detection frame sequence includes: The video frames to be processed are extracted sequentially from the appearance detection frame sequence; Determine the pixel coordinate matrix based on the Mini LED pixel matrix; Based on each pixel coordinate in the pixel coordinate matrix, a single-channel pixel value is extracted from the video frame to be processed and detected to obtain a single-channel pixel value set. Arrange the single-channel pixel value set according to the pixel coordinate matrix to obtain a single-channel pixel matrix; The single-channel pixel matrices of each video frame to be processed are combined to obtain a single-channel pixel matrix sequence.

5. The appearance inspection method based on Mini LED display as described in claim 4, characterized in that, The step of superimposing the single-channel pixel matrix sequence with the same pixel to obtain the actual superimposed pixel matrix includes: Pixel coordinates are extracted sequentially from the pixel coordinate matrix, and the actual single-channel pixel value sequence corresponding to the pixel coordinates is extracted from the single-channel pixel matrix sequence. Using a pre-constructed actual pixel overlay formula, the actual overlay pixel value of the pixel coordinates is calculated based on the actual single-channel pixel value sequence. The actual superimposed pixel values ​​are arranged according to the pixel coordinates to obtain the actual superimposed pixel matrix.

6. The appearance inspection method based on Mini LED display as described in claim 5, characterized in that, Before determining whether the actual superimposed pixel matrix is ​​equal to the preset standard superimposed pixel matrix, the method further includes: A standard single-channel pixel value sequence is calculated using the single-channel pixel trigonometric function; Using a pre-constructed standard pixel overlay formula, the standard overlay pixel value of the pixel coordinates is calculated based on the standard single-channel pixel value sequence. The standard superimposed pixel values ​​are arranged according to the pixel coordinates to obtain a standard superimposed pixel matrix.

7. The appearance inspection method based on Mini LED display as described in claim 6, characterized in that, The step of performing appearance detection based on the actual superimposed pixel matrix and the standard superimposed pixel matrix to obtain abnormal pixels includes: The actual superimposed pixel matrix and the standard superimposed pixel matrix are compared to obtain the coordinates of the differing pixels. Identify the appearance detection abnormal pixels corresponding to the differential pixel coordinates in the Mini LED pixel matrix.

8. The appearance inspection method based on Mini LED display as described in claim 7, characterized in that, After performing appearance detection based on the actual superimposed pixel matrix and the standard superimposed pixel matrix, the method further includes: Extract the actual difference pixel value corresponding to the difference pixel coordinates from the actual superimposed pixel matrix; Extract the standard difference pixel value corresponding to the difference pixel coordinate in the standard superimposed pixel matrix; The detection anomaly evaluation value of the appearance detection anomaly pixel is calculated using a pre-constructed pixel detection evaluation formula based on the actual difference pixel value and the standard difference pixel value.

9. An appearance inspection system based on Mini LED display, characterized in that... The system for implementing the appearance inspection method based on Mini LED display according to any one of claims 1-8 includes: A single-channel pixel trigonometric function construction module is used to receive the appearance detection period and appearance detection frame rate, calculate the unit frame time based on the appearance detection frame rate, wherein the unit frame time refers to the display duration of a single video frame; obtain a Mini LED pixel matrix, extract matrix pixels sequentially from the Mini LED pixel matrix, and identify the pixel coordinates of the matrix pixels; calculate the target phase shift of the matrix pixels based on the pixel coordinates and a preset unit phase shift; and construct a single-channel pixel trigonometric function for the matrix pixels based on the appearance detection period, unit frame time, and target phase shift. A single-channel pixel matrix sequence construction module is used to perform pixel display control on the matrix pixels according to the single-channel pixel trigonometric function to obtain an appearance display video; extract the appearance detection frame sequence from the appearance display video according to the appearance detection period and unit frame time, and construct a single-channel pixel matrix sequence according to the appearance detection frame sequence. The actual superimposed pixel matrix calculation module is used to superimpose the single-channel pixel matrix sequence pixel by pixel to obtain the actual superimposed pixel matrix. The appearance detection abnormal pixel identification module is used to determine whether the actual superimposed pixel matrix is ​​equal to the preset standard superimposed pixel matrix; if the actual superimposed pixel matrix is ​​equal to the standard superimposed pixel matrix, the steps of receiving the appearance detection period and appearance detection frame rate mentioned above are returned; if the actual superimposed pixel matrix is ​​not equal to the standard superimposed pixel matrix, appearance detection is performed based on the actual superimposed pixel matrix and the standard superimposed pixel matrix to obtain the appearance detection abnormal pixels.

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