Display screen color stripe severity assessment method and device

Abstract

The invention discloses a display screen color stripe severity assessment method and device. The method comprises the following steps: respectively selecting lamp beads at the closest distance on two sides of a splicing line of adjacent LED units, and marking the selected lamp beads as a target lamp bead set; lighting up lamp beads in the target lamp bead set, and testing the chromaticity of the target lamp bead set to obtain a first color value set; selecting lamp beads with the same arrangement as the target lamp bead set in the LED unit as a contrast lamp bead set; lighting the lamp beads in the contrast lamp bead set, and testing the chromaticity of the contrast lamp bead set to obtain a second color value set; performing color difference value calculation on the first color value set and the second color value set to obtain a total color difference value; and obtaining the severity of the color stripes according to the total color difference value. The severity of the color stripes at the splicing position of the display screen can be evaluated based on the total color difference value, manual evaluation is not needed, the labor cost is reduced, and the accuracy of evaluating the severity of the color stripes at the splicing position of the display screen is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display screen calibration, and in particular to a method and device for evaluating the severity of color stripes on a display screen. Background Art

[0002] The existing COB (chip-on-board) packaged LED display with small dot pitch is made of units of a certain size, so there may be differences at the joints. The optical path is destroyed due to the cutting of the optical packaging glue of the display unit at the joint gap and the edge of the joint, resulting in horizontal or vertical color bars at the joint, which are more obvious at larger angles.

[0003] The size of the splicing difference is usually evaluated subjectively by human observation, which has the problem of ununiform standards and low evaluation accuracy. At the same time, fixed and experienced evaluators are required to conduct the evaluation. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method and device for evaluating the severity of color stripes on a display screen, so as to improve the accuracy of evaluating the severity of color stripes at a splicing portion of a display screen.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A method for evaluating the severity of color stripes on a display screen, comprising:

[0007] Select the lamp beads with the closest distance on both sides of the adjacent LED unit splicing line and mark them as the target lamp bead set;

[0008] Lighting up the lamp beads in the target lamp bead set, and testing the chromaticity of the target lamp bead set to obtain a first color value set;

[0009] Selecting the lamp beads in the LED unit that have the same arrangement as the target lamp bead set as the control lamp bead set;

[0010] Lighting up the lamp beads in the reference lamp bead set, and testing the chromaticity of the reference lamp bead set to obtain a second color value set;

[0011] Calculate the color difference between the first color value set and the second color value set to obtain a total color difference value;

[0012] The severity of the color fringes is obtained according to the total color difference value.

[0013] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0014] A device for evaluating the severity of color stripes on a display screen comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, each step in the above-mentioned method for evaluating the severity of color stripes on a display screen is implemented.

[0015] The beneficial effects of the present invention are as follows: by selecting lamp beads on both sides of the adjacent LED unit splicing line as the target lamp bead set to be tested, and obtaining lamp beads with the same arrangement at the non-splicing line as the control lamp bead set, and performing chromaticity tests on the target lamp bead set and the control lamp bead set respectively, and calculating the color difference value based on the obtained first color value set and the second color value set, the severity of the color stripes at the splicing of the display screen can be evaluated based on the total color difference value, without the need for manual evaluation, thereby reducing labor costs and improving the accuracy of the evaluation of the severity of the color stripes at the splicing of the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flowchart of a method for evaluating the severity of color fringes on a display screen according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of a first arrangement of LED units in a method for evaluating the severity of color fringes on a display screen according to an embodiment of the present invention;

[0018] Figure 3 Schematic diagram of a second arrangement of LED units in a method for evaluating the severity of color fringes on a display screen according to an embodiment of the present invention;

[0019] Figure 4 Schematic diagram of a third arrangement of LED units in a method for evaluating the severity of color fringes on a display screen according to an embodiment of the present invention;

[0020] Figure 5 A schematic diagram of lighting up a lamp bead in a method for evaluating the severity of color stripes on a display screen according to an embodiment of the present invention;

[0021] Figure 6 A schematic diagram of a chromaticity test in a method for evaluating the severity of color fringes on a display screen according to an embodiment of the present invention;

[0022] Figure 7 Schematic diagram of the structure of a device for evaluating the severity of color fringes on a display screen according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0024] Please refer to Figure 1, a method for evaluating the severity of color stripes on a display screen, comprising:

[0025] Select the lamp beads with the closest distance on both sides of the adjacent LED unit splicing line and mark them as the target lamp bead set;

[0026] Lighting up the lamp beads in the target lamp bead set, and testing the chromaticity of the target lamp bead set to obtain a first color value set;

[0027] Selecting the lamp beads in the LED unit that have the same arrangement as the target lamp bead set as the control lamp bead set;

[0028] Lighting up the lamp beads in the reference lamp bead set, and testing the chromaticity of the reference lamp bead set to obtain a second color value set;

[0029] Calculate the color difference between the first color value set and the second color value set to obtain a total color difference value;

[0030] The severity of the color fringes is obtained according to the total color difference value.

[0031] From the above description, it can be seen that the beneficial effects of the present invention are: by selecting lamp beads on both sides of the adjacent LED unit splicing line as the target lamp bead set to be tested, and obtaining lamp beads with the same arrangement at the non-splicing line as the control lamp bead set, and performing chromaticity tests on the target lamp bead set and the control lamp bead set respectively, and calculating the color difference value based on the obtained first color value set and the second color value set, the severity of the color stripes at the splicing of the display screen can be evaluated based on the total color difference value, without the need for manual evaluation, reducing labor costs, and improving the accuracy of the evaluation of the severity of the color stripes at the splicing of the display screen.

[0032] Further, the testing of the chromaticity of the target lamp bead set includes:

[0033] The angle between the acquisition device and the target lamp bead set is adjusted in sequence at preset angle intervals, and the chromaticity of the target lamp bead set is tested at the target angle to obtain a first color value corresponding to each angle.

[0034] From the above description, it can be seen that by testing the chromaticity of the target lamp bead set at corresponding angles in sequence at preset angle intervals, that is, when evaluating the severity of color stripes, the evaluation can be based on the chromaticity of the target lamp bead set at each angle, thereby improving the accuracy of the evaluation.

[0035] Further, the adjusting the angle between the acquisition device and the target lamp bead set at preset angle intervals in sequence and testing the chromaticity of the target lamp bead set at the target angle includes:

[0036] Fix the COB box to be tested on a rotatable base frame, and place the center point of the target lamp bead collection directly opposite the light collecting tube;

[0037] The base frame is rotated sequentially at preset angle intervals to obtain a first color value corresponding to each angle.

[0038] From the above description, it can be known that by fixing the COB box to be tested on a rotatable base frame, the angle of the COB box to be tested can be changed by rotating the base frame, and only one light collecting tube is needed to achieve testing of all angles.

[0039] Further, lighting up the lamp beads in the target lamp bead set includes:

[0040] Determine the number of lamp beads to be tested in the target lamp bead set according to the size of the light collecting tube;

[0041] According to the number of lamp beads to be tested, a corresponding number of lamp beads are lit in turn in each round of testing.

[0042] From the above description, it can be seen that the number of lamp beads to be tested is determined by the size of the light collecting tube, and the corresponding lamp beads are lit to avoid the situation where the number of lamp beads to be tested exceeds the limit that the light collecting tube can test, resulting in some lamp beads being missed.

[0043] Further, the calculating the color difference value of the first color value set and the second color value set to obtain the total color difference value includes:

[0044] The color difference value corresponding to each angle is obtained according to the first color value set and the second color value set. The specific calculation method is as follows:

[0045]

[0046] Among them, △E i Indicates the color difference value corresponding to the i-th angle; u i 、v i represents the first color value at the i-th angle; u o i 、v o i represents the second color value at the i-th angle;

[0047] The mean square error is calculated based on the color difference values ​​corresponding to all angles to obtain the total color difference value.

[0048] From the above description, it can be seen that by calculating the difference between the first color value and the second color value at each angle, the total color difference value is obtained by performing mean square error calculation, that is, the larger the total color difference value, the larger the color difference deviation, thereby achieving an assessment of the severity of the color bar phenomenon.

[0049] Furthermore, the testing of the chromaticity of the target lamp bead set further includes:

[0050] The chromaticity of the target lamp bead set is tested in a dark room environment.

[0051] It can be seen from the above description that by testing the chromaticity of the target lamp bead set in a dark room environment, the influence of external ambient light on the test can be avoided and the test accuracy can be improved.

[0052] Furthermore, lighting up the lamp beads in the target lamp bead set further comprises:

[0053] All lamp beads other than the target lamp bead set are turned off.

[0054] From the above description, it can be seen that in the process of testing the chromaticity of the chromaticity target lamp bead set, all lamp beads other than the target lamp bead set are extinguished, so that the color bar data can be accurately collected without being affected by the light emission of other lamp beads on the data collector.

[0055] Furthermore, the target lamp bead set includes a horizontal arrangement in a straight line or a triangular arrangement.

[0056] From the above description, it can be seen that the target lamp bead set includes a horizontal arrangement of a straight line or a triangular arrangement, that is, the evaluation method can be applied to COB boxes with different lamp bead arrangements.

[0057] Another embodiment of the present invention provides a device for evaluating the severity of color stripes on a display screen, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps in the above-mentioned method for evaluating the severity of color stripes on a display screen when executing the computer program.

[0058] The method and device for evaluating the severity of color stripes on a display screen provided by the present invention can be applied to the display effect quality evaluation of a COB-packaged MICRO LED display screen, such as a COB-packaged LED display screen with a surface sealing process, and is used to evaluate the optical verification in the process development evaluation stage, which is related to the optical properties of the surface sealing and the optical properties of the joint (cut) after optical treatment, such as refraction, reflection and other properties. The following is an explanation through a specific implementation method:

[0059] Embodiment 1

[0060] Please refer to Figure 1 , a method for evaluating the severity of color stripes on a display screen, comprising:

[0061] S1. Select the closest lamp beads on both sides of the adjacent LED unit splicing line and mark them as the target lamp bead set; wherein the LED unit in this embodiment is the smallest splicing unit of the LED display screen; for example, the LED display screen is formed by splicing multiple display boxes, and a display box is formed by splicing multiple display modules, then the LED unit in this embodiment represents the display module; the splicing line is generated by splicing adjacent display modules. wherein the target lamp bead set includes a horizontal arrangement of a line or a triangle arrangement; such as Figure 2 As shown, the target lamp beads are arranged horizontally in a line, and the pixel points are arranged vertically in a line, that is, the red lamp beads, the green lamp beads and the blue lamp beads are arranged vertically in sequence; or Figure 3 As shown, the target lamp beads are also arranged in a line horizontally, but the pixel points are arranged in a line horizontally, that is, the red lamp beads, the green lamp beads and the blue lamp beads are arranged horizontally in sequence; or as Figure 4 As shown, the target lamp bead set is arranged in a triangular shape; in the embodiment of the present application, the arrangement of the LED unit lamp beads may also be other ways.

[0062] S2. Light up the lamp beads in the target lamp bead set, and test the chromaticity of the target lamp bead set to obtain a first color value set; specifically: adjust the angle between the acquisition device and the target lamp bead set at preset angle intervals, and test the chromaticity of the target lamp bead set at the target angle to obtain the first color value corresponding to each angle. In an optional implementation, the chromaticity of the target lamp bead set is tested in the following manner:

[0063] Please refer to Figure 5 as well as Figure 6 , fix the COB box to be tested on a rotatable base frame, and face the center point of the target lamp bead set to the light collecting tube; rotate the base frame in sequence at preset angle intervals to obtain the first color value corresponding to each angle. Among them, the test process needs to be carried out in a dark room environment in the laboratory. After determining the number of lamp beads to be tested in the target lamp bead set according to the size of the light collecting tube, the corresponding number of lamp beads are lit in sequence in each round of testing according to the number of lamp beads to be tested; that is, after several lit lamp beads optically mix light, they are transmitted through a certain distance to reach the light collector, and the light collector collects the light within the three-dimensional angle and then enters the photometric tester for light data testing; at the same time, turn off all other lamp beads outside the target lamp bead set. For example, use specific software to light up the wafers that will produce light influence at the splicing line, while other wafers are not lit, so as to accurately collect color bar data without being affected by the light emission of other wafers on the data collector. In a specific embodiment, the preset angle interval is set to 1°, and the first color values ​​corresponding to -90° to 90° are obtained in sequence and recorded as (u, v), and the first color value set is obtained as {u -90 , v -90 ;u -89 , v -89 ;......;u89 , v 89 ;u 90 , v 90}.

[0064] S3. Select the lamp beads in the LED unit that have the same arrangement as the target lamp bead set as the control lamp bead set; for example, if the target lamp bead set is arranged horizontally in a straight line, select the lamp beads that are arranged horizontally in a straight line at the non-splicing line as the control lamp bead set.

[0065] S4, lighting up the lamp beads in the reference lamp bead set, and testing the chromaticity of the reference lamp bead set to obtain a second color value set; that is, obtaining the second color value set in the same manner as in step S2, for example, obtaining the second color value set as {u 0 -90 , v 0 -90 ;u 0 -89 , v 0 -89 ;......;u 0 89 , v 0 89 ;u 0 90 , v 0 90}.

[0066] S5. Calculate the color difference between the first color value set and the second color value set to obtain a total color difference value. Specifically:

[0067] S51, obtaining a color difference value corresponding to each angle according to the first color value set and the second color value set;

[0068]

[0069] Among them, △E i Indicates the color difference value corresponding to the i-th angle; u i 、v i represents the first color value at the i-th angle; u o i 、v o i represents the second color value at the i-th angle;

[0070] Calculate the mean square error based on the color difference values ​​corresponding to all angles to obtain the total color difference value;

[0071]

[0072] S6. Obtain the severity of color fringes according to the total color difference value;

[0073] That is, the value of the total color difference △E represents the degree of deviation between the color bar and the non-color bar part. The larger the △E value, the greater the deviation, and the smaller the △E value, the smaller the deviation, thereby determining the severity of the color bar phenomenon.

[0074] Embodiment 2

[0075] Please refer to Figure 7 A device for evaluating the severity of color stripes on a display screen includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, each step in a method for evaluating the severity of color stripes on a display screen as described in Example 1 is implemented.

[0076] In summary, the present invention provides a method and device for evaluating the severity of color stripes on a display screen. By selecting lamp beads on both sides of a splicing line of adjacent LED units as a target lamp bead set to be tested, and obtaining lamp beads with the same arrangement at a non-splicing line as a control lamp bead set, the target lamp bead set and the control lamp bead set are respectively tested for chromaticity, and the color difference value is calculated based on the obtained first color value set and the second color value set, so that the severity of color stripes at the splicing of the display screen can be evaluated based on the total color difference value, without the need for manual evaluation, thus reducing labor costs and improving the accuracy of evaluating the severity of color stripes at the splicing of the display screen; and the method can be applicable to all pixel arrangement situations, and adapt to all situations where secondary optical packaging is performed on the surface of the light-emitting lamp beads.

[0077] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for evaluating the severity of color stripes on a display screen, characterized in that: include: Select the lamp beads with the closest distance on both sides of the adjacent LED unit splicing line and mark them as the target lamp bead set; Lighting up the lamp beads in the target lamp bead set, and testing the chromaticity of the target lamp bead set to obtain a first color value set; Selecting the lamp beads in the LED unit that have the same arrangement as the target lamp bead set as the control lamp bead set; Lighting up the lamp beads in the reference lamp bead set, and testing the chromaticity of the reference lamp bead set to obtain a second color value set; Calculate the color difference between the first color value set and the second color value set to obtain a total color difference value; The severity of the color fringes is obtained according to the total color difference value.

2. A method for evaluating the severity of color fringes on a display screen according to claim 1, characterized in that: The chromaticity of the target lamp bead set is tested as follows: The angle between the acquisition device and the target lamp bead set is adjusted in sequence at preset angle intervals, and the chromaticity of the target lamp bead set is tested at the target angle to obtain a first color value corresponding to each angle.

3. A method for evaluating the severity of color fringes on a display screen according to claim 2, characterized in that: The step of sequentially adjusting the angle between the acquisition device and the target lamp bead set at preset angle intervals and testing the chromaticity of the target lamp bead set at the target angle comprises: Fix the COB box to be tested on a rotatable base frame, and place the center point of the target lamp bead collection directly opposite the light collecting tube; The base frame is rotated sequentially at preset angle intervals to obtain a first color value corresponding to each angle.

4. A method for evaluating the severity of color fringes on a display screen according to claim 3, characterized in that: The step of lighting up the lamp beads in the target lamp bead set comprises: Determine the number of lamp beads to be tested in the target lamp bead set according to the size of the light collecting tube; According to the number of lamp beads to be tested, a corresponding number of lamp beads are lit in turn in each round of testing.

5. The method for evaluating the severity of color fringes on a display screen according to claim 2, characterized in that: The calculating the color difference between the first color value set and the second color value set to obtain a total color difference value comprises: Obtaining a color difference value corresponding to each angle according to the first color value set and the second color value set; The mean square error is calculated based on the color difference values ​​corresponding to all angles to obtain the total color difference value.

6. A method for evaluating the severity of color fringes on a display screen according to claim 5, characterized in that: The obtaining the color difference value corresponding to each angle according to the first color value set and the second color value set comprises: Among them, △E i Indicates the color difference value corresponding to the i-th angle; u i 、v i represents the first color value at the i-th angle; u o i 、v o i Represents the second color value at the i-th angle.

7. A method for evaluating the severity of color fringes on a display screen according to claim 2, characterized in that: The step of testing the chromaticity of the target lamp bead set further comprises: The chromaticity of the target lamp bead set is tested in a dark room environment.

8. The method for evaluating the severity of color fringes on a display screen according to claim 1, characterized in that: The step of lighting up the lamp beads in the target lamp bead set further comprises: All lamp beads other than the target lamp bead set are turned off.

9. The method for evaluating the severity of color fringes on a display screen according to claim 1, characterized in that: The target lamp bead set includes a horizontal arrangement of a line or a triangular arrangement.

10. A device for evaluating the severity of color stripes on a display screen, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, each step of the method for evaluating the severity of color fringes on a display screen as described in any one of claims 1 to 9 is implemented.

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