Display performance detection method and device, industrial computer and display performance detection system

Abstract

The application provides a display performance detection method and device, an industrial computer and a display performance detection system. The method comprises the following steps: a signal source provides an image signal for a to-be-detected display device, and the image signal is used for making the to-be-detected display device display a test picture card for detecting display performance; an image acquisition device is used to acquire an image of the to-be-detected display device when the to-be-detected display device displays the test picture card; display parameters are calculated according to the acquired image; the calculated display parameters are compared with standard parameters corresponding to the test picture card, and whether the display performance of the to-be-detected display device is normal is judged according to a comparison result. The application can realize automatic detection of batch products, improve detection efficiency, and ensure the accuracy and reliability of detection results.

Description

Technical Field

[0001] This invention relates to the field of image display technology, and in particular to a display performance testing method and apparatus, an industrial control computer, and a display performance testing system. Background Technology

[0002] The television industry has strict standards and specifications for the color gamut and color accuracy of its products. In order to meet industry standards, ensure product quality and stability, and provide users with a better viewing experience, the color gamut and color accuracy of television screens need to be tested during the quality inspection process on the television production line.

[0003] Currently, there are two commonly used methods for color gamut and color accuracy testing:

[0004] (1) Testing is conducted entirely by human eye: The television displays a standard color chart (a multi-color picture), and the observer judges whether there is obvious color deviation or whether a certain color cannot be displayed. That is, the color gamut and color accuracy of the television are evaluated by observing the colors of the test picture displayed on the television.

[0005] Manual testing is inefficient and can lead to fatigue over long hours, compromising accuracy and precision. Furthermore, individual evaluation criteria differ, and human sensory judgment is susceptible to subjective factors such as personal state and emotions, resulting in low reliability and stability of test results.

[0006] (2) Testing by manually operating specialized instruments such as spectrometers or colorimeters: Specialized instruments measure and calculate the colors displayed on the television to determine their coordinates in the color space. Due to the small measurement range of the instruments, it is necessary to switch the television signal to display different colors, or move the testing instrument to various color positions in a multi-color signal to achieve the detection of the color gamut and color accuracy of multiple colors.

[0007] This method requires the use of specialized measuring instruments and places high demands on the operators' skills. Furthermore, the testing process is cumbersome, requiring testers to hold the testing instruments and take multiple measurements on a television screen. The operation is tedious and time-consuming. In order to meet the pace requirements of the production line, it is impossible to test every product; only random sampling is possible. Summary of the Invention

[0008] The display performance testing method, apparatus, industrial computer, and display performance testing system provided by this invention can realize automated testing of batch products, improve testing efficiency, and at the same time ensure the accuracy and reliability of the test results.

[0009] In a first aspect, the present invention provides a display performance testing method, the method comprising:

[0010] The control signal source provides an image signal to the display device under test (DUT), which is used to make the DUT display a test chart to detect the display performance.

[0011] The image of the test display card is acquired using an image acquisition device;

[0012] Calculate display parameters based on the acquired image;

[0013] The calculated display parameters are compared with the standard parameters corresponding to the test chart, and the display performance of the display device under test is judged based on the comparison results.

[0014] Optionally, acquiring images of the display device under test displaying the test chart via an image acquisition device includes: acquiring images of the display device under test displaying the color gamut test chart and images of the display device under test displaying the color accuracy test chart, respectively;

[0015] The calculation of display parameters based on the acquired images includes: calculating the color space values ​​of each color patch in the displayed color gamut test chart based on the acquired image of the display device under test displaying the color gamut test chart; and calculating the three component values ​​of the CIELAB color space of each color patch in the displayed color accuracy test chart based on the acquired image of the display device under test displaying the color accuracy test chart.

[0016] Optionally, the calculated display parameters are compared with the standard parameters corresponding to the test chart, and the display performance of the display device under test is determined based on the comparison results, including:

[0017] The color space values ​​of each color block in the displayed color gamut test chart are compared with the preset standard values, and the number of color blocks whose color space values ​​differ from the preset standard values ​​by less than the allowable deviation value is counted.

[0018] For each color patch in the displayed color accuracy test chart, the three component values ​​of the CIELAB color space are respectively subtracted from the three component values ​​of the CIELAB color space of the reference color patch, and the color difference value of the color patch is calculated based on the difference value; the color difference value of the color accuracy test chart displayed by the display device under test is calculated based on the color difference value of each color patch.

[0019] The overall display error of the display device under test is calculated based on the number of color blocks whose color space value is less than the allowable deviation value and the color difference value of the color accuracy test chart displayed by the display device under test.

[0020] If the overall display error is less than or equal to the standard error, the display performance of the device under test is determined to be normal; otherwise, the display performance of the device under test is determined to be abnormal.

[0021] Optionally, the overall display error of the display device under test is calculated based on the number of color blocks whose color space value differs from the preset standard value by less than the allowable deviation value, and the color difference value of the color accuracy test chart displayed by the display device under test. This calculation includes multiplying the number of color blocks whose color space value differs from the preset standard value by less than the allowable deviation value by a first weight, multiplying the color difference value of the color accuracy test chart displayed by the display device under test by a second weight, and adding the two products together to obtain the overall display error of the display device under test.

[0022] Optionally, after comparing the calculated display parameters with the standard parameters corresponding to the test chart, and determining whether the display performance of the display device under test is normal based on the comparison results, the method further includes:

[0023] If the display performance of the device under test is determined to be normal, the device under test will be allowed to proceed; otherwise, a prompt indicating that the display performance of the device under test is abnormal will be issued.

[0024] In a second aspect, the present invention provides a display performance testing device, the device comprising:

[0025] The control unit is used to control the signal source to provide image signals to the display device under test. The image signals are used to make the display device under test display the test chart for detecting display performance.

[0026] The acquisition unit is used to acquire images of the test pattern card displayed on the display device under test through an image acquisition device;

[0027] The calculation unit is used to calculate display parameters based on the acquired image;

[0028] The judgment unit is used to compare the calculated display parameters with the standard parameters corresponding to the test chart, and to determine whether the display performance of the display device under test is normal based on the comparison results.

[0029] Optionally, the acquisition unit is used to acquire images of the display device under test when displaying the color gamut test chart and images of the display device under test when displaying the color accuracy test chart;

[0030] The calculation unit is used to calculate the color space values ​​of each color block in the displayed color gamut test chart based on the image obtained when the display device under test displays the color gamut test chart, and to calculate the three component values ​​of the CIELAB color space of each color block in the displayed color accuracy test chart based on the image obtained when the display device under test displays the color accuracy test chart.

[0031] Optionally, the judgment unit includes:

[0032] The color gamut comparison module is used to compare the color space values ​​of multiple color blocks in the displayed color gamut test chart with preset standard values, and count the number of color blocks whose color space values ​​are less than the allowable deviation value.

[0033] The color accuracy comparison module is used to calculate the color difference value of each color block in the displayed color accuracy test chart by subtracting the three component values ​​of the CIELAB color space from the three component values ​​of the CIELAB color space of the reference color block, and then calculating the color difference value of the color block based on the difference value; and to calculate the color difference value of the color accuracy test chart displayed by the display device under test based on the color difference value of each color block.

[0034] The calculation module is used to calculate the overall display error of the display device under test based on the number of color blocks whose color space value is less than the allowable deviation value and the color difference value of the color accuracy test chart displayed by the display device under test.

[0035] The judgment module is used to determine that the display performance of the display device under test is normal if the overall display error is less than or equal to the standard error; otherwise, it determines that the display performance of the display device under test is abnormal.

[0036] Thirdly, the present invention provides an industrial control computer, which includes:

[0037] At least one processor; and

[0038] A memory that is communicatively connected to at least one processor; wherein,

[0039] The memory stores instructions that can be executed by at least one processor, which enables the at least one processor to perform the above-described display performance testing method.

[0040] Fourthly, the present invention provides a display performance testing system, comprising: a signal source, an image acquisition device, and an industrial control computer; the signal source is connected to the display device under test and the industrial control computer; the image acquisition device is connected to the industrial control computer; wherein,

[0041] The signal source is used to receive instructions from the industrial control computer and provide image signals to the display device under test, so that the display device under test can display the test chart for detecting display performance.

[0042] Image acquisition equipment is used to acquire images of the display device under test when displaying the test chart and send them to the industrial control computer.

[0043] An industrial computer is used to perform the above-mentioned display performance testing method.

[0044] The display performance testing method, apparatus, industrial control computer, and display performance testing system provided in this invention evaluate the display performance of the display device under test based on the image of the test chart displayed on the display device. The image of the test chart displayed on the display device is automatically acquired by an image acquisition device, avoiding human observation, reducing manual intervention, and enabling automated testing of batch products, thus improving testing efficiency. The industrial control computer automatically calculates the display parameters based on the image of the test chart displayed on the display device under test, compares the calculated display parameters with the standard parameters corresponding to the test chart, and thus determines whether the display performance of the display device under test is normal, thereby ensuring the accuracy and reliability of the test results. Attached Figure Description

[0045] Figure 1 This is a flowchart of a performance testing method according to an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of a color gamut test chart provided in an embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the color accuracy test chart provided in an embodiment of the present invention;

[0048] Figure 4 This is a schematic diagram of the structure of a performance testing device according to an embodiment of the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] This invention provides a display performance testing method, such as... Figure 1 As shown, the method includes:

[0051] S11. The control signal source provides an image signal to the display device under test. The image signal is used to make the display device under test display a test chart for detecting display performance.

[0052] S12. Acquire the image of the test chart card displayed on the display device under test through the image acquisition device.

[0053] S13. Calculate the display parameters based on the acquired image.

[0054] S14. Compare the calculated display parameters with the standard parameters corresponding to the test chart, and determine whether the display performance of the display device under test is normal based on the comparison results.

[0055] The display performance testing method provided in this invention evaluates the display performance of the display device under test by using the image of a test chart displayed on the display device. This image is automatically acquired by an image acquisition device, avoiding human observation, reducing manual intervention, and enabling automated testing of batch products, thus improving testing efficiency. The industrial control computer automatically calculates display parameters based on the image of the test chart displayed on the display device, compares the calculated display parameters with the corresponding standard parameters of the test chart, and thus determines whether the display performance of the display device under test is normal, thereby ensuring the accuracy and reliability of the test results.

[0056] The display performance testing method of the present invention will be described in detail below with reference to specific embodiments.

[0057] In this embodiment, the display device is a television set, the image acquisition device is an industrial camera, and the display parameters include color gamut and color accuracy.

[0058] This embodiment is implemented through a system comprising the following components: a darkroom built on the production line, a television signal source, an industrial camera, an industrial remote control, an industrial computer, and other sensors for detecting the status of the television under test.

[0059] The main functions of each component are as follows:

[0060] Darkroom: Creates uniform testing conditions to reduce the influence of sunlight, fluorescent lights, or other lighting.

[0061] Television signal source: Connects the industrial control computer and the television under test, receives instructions from the industrial control computer, provides signals to the television under test, and enables the industrial control computer to send instructions to the television to display the image required for the test;

[0062] Industrial remote control: Connects to an industrial computer, receives commands from the industrial computer, and controls the status of the TV, such as switching the TV to a specified HDMI channel and setting TV image parameters such as brightness and contrast.

[0063] Industrial camera: Connects to the industrial control computer, acquires the image of the TV under test displaying the specified test chart, and sends it to the industrial control computer;

[0064] Industrial PC: Connects to TV signal source, industrial remote control, industrial camera, and sensors that detect the status of the TV under test. It is used to control various modules, process images, and calculate test results.

[0065] Sensors for detecting the status of the TV under test: to acquire the status of the TV under test, such as whether the fixture plate is in place, and whether the TV under test is on the fixture plate.

[0066] A docking device: a line connection device that enables connection between a wiring device fixed at a testing station and a wiring device located on a movable tooling plate on an assembly line.

[0067] The display performance testing method provided in this embodiment of the invention specifically includes the following steps:

[0068] Step S21: After the device completes initialization, the industrial control computer controls the signal source to provide image signals to the TV. The image signals are used to make the TV display the test chart for detecting display performance. The test chart is connected to the HDMI port of the TV through the docking device and displayed on the screen.

[0069] Specifically, the industrial control computer can control the signal source to sequentially provide the television with a first image signal for displaying a color gamut test chart for color gamut testing, and a second image signal for displaying a color accuracy test chart for color accuracy testing; the order of the first image signal and the second image signal can also be interchanged.

[0070] Step S22: The industrial control computer controls the industrial remote control to switch the TV to the HDMI channel connected to the signal cable, so that the TV displays the corresponding picture. Then, the brightness and contrast of the TV are adjusted to ensure that the TV is using the specified color parameters during the testing process.

[0071] Step S23: The industrial control computer acquires the image of the test chart card displayed on the television through the industrial camera.

[0072] Specifically, the industrial control computer sequentially acquires a first image of the TV display color gamut test chart and a second image of the TV display color accuracy test chart using an industrial camera; the order in which the first and second images are acquired can be interchanged.

[0073] Step S24: The industrial control computer preprocesses the image of the test chart card displayed on the television set, which is obtained through the industrial camera.

[0074] Specifically, the industrial control computer preprocesses the first and second images acquired sequentially by the industrial camera. The specific operations include:

[0075] (1) Use a threshold segmentation algorithm to extract the TV screen area and crop it.

[0076] (2) Perform distortion correction and vignetting compensation.

[0077] Distortion Correction: Due to the limitations of single-camera imaging, large-screen television images are prone to distortion. An image processing-based distortion correction method is employed, which calculates distortion coefficients based on the rectangular shape of the television image. Then, the distortion-corrected pixel coordinates are calculated for each pixel, and interpolation is used to complete the image correction.

[0078] Vignette compensation: After the camera captures an image, the brightness of the four corners is lower than that of the center. A vignetting compensation algorithm based on camera calibration is used to regenerate an image with uniform brightness by using compensation coefficients set for each coordinate point for the workstation environment and the camera.

[0079] (3) Use median filtering to denoise the image to improve the image clarity and reliability.

[0080] (4) Enhance the color of the image to improve the overall brightness and contrast of the image, so as to facilitate the extraction of the area of ​​each color block in the TV test chart image.

[0081] (5) Convert the image from RGB color space to HSV. The specific conversion formula is as follows:

[0082] V = max(R, G, B)

[0083] S=(V-min(R,G,B)) / V

[0084] H=60*(GB) / (V-min(R,G,B))(if V==R)

[0085] 60*(2+(BR) / (V-min(R,G,B)))(if V==G)

[0086] 60*(4+(RG) / (V-min(R,G,B)))(if V==B)

[0087] (6) The color map in the image is divided into several blocks by threshold segmentation and shape-based segmentation algorithms. The HSV weighted average value of each color block is calculated, and the weight of the edge region of the color block is reduced according to preset parameters.

[0088] Step S25: Perform color gamut calculation on the preprocessed first image.

[0089] like Figure 2 As shown, the color gamut test chart displayed on the TV is a customized chart based on the sRGB color space. Its display content is a circular arrangement of 168 color blocks, with each of the 24 common colors arranged from dark to light, consisting of 7 color blocks.

[0090] If the TV can display all the colors in the color gamut test chart normally, calculate the color space value of each of the 168 color blocks in the displayed color gamut test chart, compare the color space value of each of the 168 color blocks in the displayed color gamut test chart with the preset standard value, calculate the difference between the color space value and the preset standard value, and count the number of color blocks whose color space value is less than the allowable deviation value.

[0091] Step S26: Perform color accuracy calculation on the preprocessed second image.

[0092] like Figure 3 As shown, the color accuracy test chart displayed on the television set contains 12 colors, each divided into 5 levels from dark to light, totaling 60 circular color blocks.

[0093] The formula for converting RGB values ​​to the three components of the CIE XYZ color space is as follows:

[0094] X = 0.4124R + 0.3576G + 0.1805B

[0095] Y = 0.2126R + 0.7152G + 0.0722B

[0096] Z = 0.0193R + 0.1192G + 0.9505B

[0097] The formula for converting the three component values ​​of the CIE XYZ color space to the three component values ​​of the CIELAB color space is as follows:

[0098] L*=116(Y / Yn)^(1 / 3)-16

[0099] a*=500[(X / Xn)^(1 / 3)-(Y / Yn)^(1 / 3)]

[0100] b*=200[(Y / Yn)^(1 / 3)-(Z / Zn)^(1 / 3)]

[0101] Wherein, Yn is the luminance value of the reference white point, usually 100; Xn and Zn are the component values ​​of the CIE XYZ color space of the reference white point, and their calculation method is related to Yn.

[0102] The ΔE value between the test color patch and the reference color patch is calculated using the following formula:

[0103] △E=sqrt((△L*)^2+(△a*)^2+(△b*)^2)

[0104] Among them, △L*, △a*, and △b* are the differences between the test color patch and the reference color patch in the L*, a*, and b* components of the CIELAB color space, respectively.

[0105] For each of the 60 color patches in the test image, their ΔE values ​​are calculated, and then a weighted average is calculated as the color difference value of the second image displayed on the television. The weights are determined by external input parameters.

[0106] Step S27: Calculate the overall display error of the television based on the number of color blocks whose difference between the color space value obtained in step S25 and the preset standard value is less than the allowable deviation value, and the color difference value of the second image displayed by the television obtained in step S26.

[0107] Specifically, the number of color blocks whose color space value differs from the preset standard value by less than the allowable deviation value is multiplied by a first weight, and the color difference value of the color accuracy test chart displayed by the TV is multiplied by a second weight. The two products are then added together to obtain the overall display error of the TV.

[0108] Step S28: If the overall display error is less than or equal to the standard error, the display performance of the TV is determined to be normal; otherwise, the display performance of the TV is determined to be abnormal.

[0109] Furthermore, after step S28, the method may further include:

[0110] Step S29: If the display performance of the TV is determined to be normal, the TV is instructed to be released; otherwise, an audible and visual alarm indicating abnormal display performance of the TV is issued, and on-site personnel are called to handle the situation.

[0111] The display performance testing method provided in this invention uses a high-resolution industrial camera to replace human observation or manual operation, achieving automated testing, reducing manual intervention, and enabling the screening of good and defective products under general accuracy requirements (ΔE value 3-8). Color gamut and color accuracy can be completed in one go by taking a single image. The entire operation can be completed within 10 seconds, improving testing efficiency and meeting the needs of large-scale production. The industrial control computer can realize a unified testing and evaluation standard, avoiding subjective human judgment. The industrial control computer automatically calculates the display parameters based on the image of the test chart displayed on the display device under test, compares the calculated display parameters with the standard parameters corresponding to the test chart, and thus determines whether the display performance of the display device under test is normal, thereby ensuring the accuracy and reliability of the test results.

[0112] This invention also provides a display performance testing device, such as... Figure 4 As shown, the device includes:

[0113] Control unit 11 is used to control the signal source to provide image signals to the display device under test. The image signals are used to make the display device under test display a test chart for detecting display performance.

[0114] Acquisition unit 12 is used to acquire images of the test pattern card displayed by the display device under test through an image acquisition device;

[0115] Calculation unit 13 is used to calculate display parameters based on the acquired image;

[0116] The judgment unit 14 is used to compare the calculated display parameters with the standard parameters corresponding to the test chart, and to judge whether the display performance of the display device under test is normal based on the comparison result.

[0117] The display performance testing device provided in this invention evaluates the display performance of a display device under test by using the image of a test chart displayed on the device. This image is automatically acquired by an image acquisition device, avoiding human observation, reducing manual intervention, and enabling automated testing of batch products, thus improving testing efficiency. The industrial control computer automatically calculates display parameters based on the image of the test chart on the device under test, compares the calculated display parameters with the corresponding standard parameters of the test chart, and determines whether the display performance of the device under test is normal, thereby ensuring the accuracy and reliability of the test results.

[0118] Optionally, the acquisition unit 12 is used to acquire images of the display device under test when displaying the color gamut test chart and images of the display device under test when displaying the color accuracy test chart, respectively;

[0119] The calculation unit is used to calculate the color space values ​​of each color block in the displayed color gamut test chart based on the image obtained when the display device under test displays the color gamut test chart, and to calculate the three component values ​​of the CIELAB color space of each color block in the displayed color accuracy test chart based on the image obtained when the display device under test displays the color accuracy test chart.

[0120] Optionally, the judgment unit 14 includes:

[0121] The color gamut comparison module is used to compare the color space values ​​of multiple color blocks in the displayed color gamut test chart with preset standard values, and count the number of color blocks whose color space values ​​are less than the allowable deviation value.

[0122] The color accuracy comparison module is used to calculate the color difference value of each color block in the displayed color accuracy test chart by subtracting the three component values ​​of the CIELAB color space from the three component values ​​of the CIELAB color space of the reference color block, and then calculating the color difference value of the color block based on the difference value; and to calculate the color difference value of the color accuracy test chart displayed by the display device under test based on the color difference value of each color block.

[0123] The calculation module is used to calculate the overall display error of the display device under test based on the number of color blocks whose color space value is less than the allowable deviation value and the color difference value of the color accuracy test chart displayed by the display device under test.

[0124] The judgment module is used to determine that the display performance of the display device under test is normal if the overall display error is less than or equal to the standard error; otherwise, it determines that the display performance of the display device under test is abnormal.

[0125] Optionally, the calculation module is used to multiply the number of color blocks whose difference between the color space value and the preset standard value is less than the allowable deviation value by a first weight, multiply the color difference value of the color accuracy test chart displayed by the display device under test by a second weight, and add the two products to obtain the overall display error of the display device under test.

[0126] This invention also provides an industrial control computer, which includes:

[0127] At least one processor; and

[0128] A memory that is communicatively connected to at least one processor; wherein,

[0129] The memory stores instructions that can be executed by at least one processor, which enables the at least one processor to perform the above-described display performance testing method.

[0130] This invention also provides a display performance testing system, comprising: a signal source, an image acquisition device, and an industrial control computer. The signal source is connected to the display device under test and the industrial control computer, and the image acquisition device is connected to the industrial control computer.

[0131] The signal source is used to receive instructions from the industrial control computer and provide image signals to the display device under test, so that the display device under test can display the test chart for detecting display performance.

[0132] Image acquisition equipment is used to acquire images of the display device under test when displaying the test chart and send them to the industrial control computer.

[0133] An industrial computer is used to perform the above performance testing methods.

[0134] The display performance testing system provided in this invention evaluates the display performance of a display device under test by using the image of a test chart displayed on the device. This image is automatically acquired by an image acquisition device, avoiding human observation, reducing manual intervention, and enabling automated testing of batch products, thus improving testing efficiency. The industrial control computer automatically calculates display parameters based on the image of the test chart on the device under test, compares the calculated display parameters with the corresponding standard parameters of the test chart, and determines whether the display performance of the device under test is normal, thereby ensuring the accuracy and reliability of the test results.

[0135] Those skilled in the art will understand that all or part of the processes in the above method embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0136] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for testing display performance, characterized in that, The method includes: A control signal source provides an image signal to the display device under test. The image signal is used to enable the display device under test to display a test chart for detecting display performance. The test chart includes a color gamut test chart and a color accuracy test chart. The image of the test pattern card displayed on the display device under test is acquired using an image acquisition device. The display parameters are calculated based on the obtained image. The display parameters include the color space values ​​of each color block in the color gamut test chart and the three component values ​​of the CIELAB color space of each color block in the displayed color accuracy test chart. The calculated display parameters are compared with the standard parameters corresponding to the test chart, and the display performance of the display device under test is determined based on the comparison results. The step of comparing the calculated display parameters with the standard parameters corresponding to the test chart, and determining whether the display performance of the display device under test is normal based on the comparison result, includes: The color space values ​​of each color block in the displayed color gamut test chart are compared with the preset standard values, and the number of color blocks whose color space values ​​differ from the preset standard values ​​by less than the allowable deviation value is counted. For each color patch in the displayed color accuracy test chart, the three component values ​​of the CIELAB color space are respectively subtracted from the three component values ​​of the CIELAB color space of the reference color patch, and the color difference value of the color patch is calculated based on the difference value; the color difference value of the color accuracy test chart displayed by the display device under test is calculated based on the color difference value of each color patch. The overall display error of the display device under test is calculated based on the number of color blocks whose difference between the color space value and the preset standard value is less than the allowable deviation value, and the color difference value of the color accuracy test chart displayed by the display device under test. If the overall display error is less than or equal to the standard error, the display performance of the display device under test is determined to be normal; otherwise, the display performance of the display device under test is determined to be abnormal.

2. The method according to claim 1, characterized in that, The step of acquiring the image of the display device under test displaying the test chart through the image acquisition device includes: acquiring the image of the display device under test displaying the color gamut test chart and the image of the display device under test displaying the color accuracy test chart, respectively; The step of calculating display parameters based on the acquired image includes: calculating the color space values ​​of each color block in the displayed color gamut test chart based on the acquired image of the display device under test displaying the color gamut test chart; and calculating the three component values ​​of the CIELAB color space of each color block in the displayed color accuracy test chart based on the acquired image of the display device under test displaying the color accuracy test chart.

3. The method according to claim 1, characterized in that, The step of calculating the overall display error of the display device under test based on the number of color blocks whose difference between the color space value and the preset standard value is less than the allowable deviation value, and the color difference value of the color accuracy test chart displayed by the display device under test, includes: multiplying the number of color blocks whose difference between the color space value and the preset standard value is less than the allowable deviation value by a first weight, multiplying the color difference value of the color accuracy test chart displayed by the display device under test by a second weight, and adding the two products to obtain the overall display error of the display device under test.

4. The method according to any one of claims 1 to 3, characterized in that, After comparing the calculated display parameters with the standard parameters corresponding to the test chart, and determining whether the display performance of the display device under test is normal based on the comparison result, the method further includes: If the display performance of the device under test is determined to be normal, the device under test is allowed to proceed; otherwise, a prompt indicating that the display performance of the device under test is abnormal is issued.

5. A display performance testing device, characterized in that, The device includes: A control unit is used to control a signal source to provide an image signal to the display device under test. The image signal is used to enable the display device under test to display a test chart for detecting display performance. The test chart includes a color gamut test chart and a color accuracy test chart. The acquisition unit is used to acquire an image of the test pattern card displayed by the display device under test through an image acquisition device; The calculation unit is used to calculate display parameters based on the acquired image. The display parameters include the color space values ​​of each color patch in the color gamut test chart and the three component values ​​of the CIELAB color space of each color patch in the displayed color accuracy test chart. The judgment unit is used to compare the calculated display parameters with the standard parameters corresponding to the test chart, and to judge whether the display performance of the display device under test is normal based on the comparison result; The determination unit includes: The color gamut comparison module is used to compare the color space values ​​of multiple color blocks in the displayed color gamut test chart with preset standard values, and count the number of color blocks whose color space values ​​are less than the allowable deviation value. The color accuracy comparison module is used to calculate the color difference value of each color block in the displayed color accuracy test chart by subtracting the three component values ​​of the CIELAB color space from the three component values ​​of the CIELAB color space of the reference color block, and calculating the color difference value of the color block based on the difference value; and to calculate the color difference value of the color accuracy test chart displayed by the display device under test based on the color difference value of each color block. The calculation module is used to calculate the overall display error of the display device under test based on the number of color blocks whose difference between the color space value and the preset standard value is less than the allowable deviation value, and the color difference value of the color accuracy test chart displayed by the display device under test. The determination module is used to determine that the display performance of the display device under test is normal if the overall display error is less than or equal to the standard error, and otherwise determine that the display performance of the display device under test is abnormal.

6. The apparatus according to claim 5, characterized in that, The acquisition unit is used to acquire images of the display device under test when displaying the color gamut test chart and images when displaying the color accuracy test chart, respectively. The calculation unit is used to calculate the color space values ​​of each color block in the displayed color gamut test chart based on the image obtained when the display device under test displays the color gamut test chart, and to calculate the three component values ​​of the CIELAB color space of each color block in the displayed color accuracy test chart based on the image obtained when the display device under test displays the color accuracy test chart.

7. An industrial control computer, characterized in that, The industrial control computer includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 4.

8. A display performance testing system, characterized in that, The system includes: a signal source, an image acquisition device, and an industrial control computer. The signal source is used to connect to the display device under test and the industrial control computer. The image acquisition device is connected to the industrial control computer. The signal source is used to receive instructions from the industrial control computer and provide image signals to the display device under test, so that the display device under test can display a test chart for detecting display performance. The image acquisition device is used to acquire images of the test display card displayed by the display device under test and send them to the industrial control computer; The industrial control computer is used to execute the method according to any one of claims 1 to 4.

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