Chromatic aberration elimination method of display module and chromatic aberration elimination method of spliced screen

Abstract

At least one embodiment of the invention provides a color difference elimination method of a display module and a color difference elimination method of a spliced screen. The color difference elimination method comprises the following steps: acquiring brightness data and chroma data of the display module under a plurality of gray-scale values; extracting brightness data and chrominance data corresponding to the plurality of areas under the plurality of gray-scale values; calculating the color coordinate difference between the chromaticity data corresponding to the plurality of areas under the plurality of gray-scale values and the target color coordinate; calculating the brightness difference between the brightness data corresponding to the plurality of areas under the plurality of gray-scale values and the target brightness; calculating compensation data under each gray-scale value according to the color coordinate difference and the brightness difference; generating a first type of compensation result; converting the compensation result of the first type into a file of a second type, and storing the file of the second type in a display module to form chromatic aberration elimination data; and the display screen driving board reads the chromatic aberration elimination data and drives the display screen to display, and the chromatic aberration elimination method of the display module can realize the effect of eliminating non-uniform display brightness and non-uniform chromaticity of the display module.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a method for eliminating color difference of a display module and a method for eliminating color difference of a spliced ​​screen. Background Art

[0002] Large-size display devices, such as outdoor display screens, have been widely used in various video control centers, outdoor advertising and other fields. Since the size of a single display device is very small, outdoor display screens are generally composed of multiple relatively small-sized display units arranged together to display an overall picture. Moreover, since borderless or narrow-border displays can provide users with a more shocking visual experience, they have become the current display trend.

[0003] Each display module includes a frame. The width of the frame of each display module will directly affect the width of the seam of the spliced ​​screen formed after splicing, which will affect the brightness and chromaticity of the seam of the spliced ​​screen, causing the picture displayed on the entire outdoor display screen to be divided by the frame, resulting in discontinuous picture display, which in turn affects the overall display effect of the spliced ​​screen. Therefore, the spliced ​​screen has higher requirements for the brightness and chromaticity of the display module. Summary of the invention

[0004] At least one embodiment of the present disclosure provides a method for eliminating chromatic aberration of a display module and a method for eliminating chromatic aberration of a spliced ​​screen. The method for eliminating chromatic aberration of a display module and the method for eliminating chromatic aberration of a spliced ​​screen achieve the effect of eliminating uneven display brightness and uneven chromaticity of the display module by enabling the display module to perform grayscale compensation for red display images, green display images and blue display images in each pixel area or divided block on the driving terminals of the display screen under multiple different grayscales.

[0005] At least one embodiment of the present disclosure provides a method for eliminating color difference of a display module, and the method for eliminating color difference of a display module includes: collecting brightness data and chromaticity data of the display module at multiple grayscale values; extracting the brightness data and the chromaticity data corresponding to multiple regions at the multiple grayscale values; calculating the color coordinate difference between the chromaticity data corresponding to the multiple regions at the multiple grayscale values ​​and the target color coordinate; calculating the brightness difference between the brightness data corresponding to the multiple regions at the multiple grayscale values ​​and the target brightness; calculating compensation data at each grayscale value according to the color coordinate difference and the brightness difference; generating a first type of compensation result; converting the first type of compensation result into a second type of file, and storing it in the display module to form color difference elimination data; a display screen driver board reads the color difference elimination data, and drives the display screen for display.

[0006] For example, in a method for eliminating color difference of a display module provided by at least one embodiment of the present disclosure, after calculating the brightness difference between the brightness data corresponding to the multiple areas at the multiple grayscale values ​​and the target brightness, and before calculating the compensation data at each of the grayscale values ​​based on the color coordinate difference and the brightness difference, it also includes calculating the compensation data of the light-emitting diode driving board based on the color coordinate difference and the brightness difference.

[0007] For example, in a method for eliminating chromatic aberration of a display module provided in at least one embodiment of the present disclosure, the minimum brightness of the display module is used as the brightness target value of the display module; when the adjusted brightness of the display module is less than the set brightness target value, the driving current of the light-emitting diode driving board at the corresponding position is increased according to the difference between the adjusted brightness of the display module and the target value brightness, so as to serve as brightness compensation for the insufficient brightness area of ​​the display module.

[0008] For example, in a method for eliminating color difference of a display module provided by at least one embodiment of the present disclosure, when collecting the brightness data and the chromaticity data of the display module, the multiple grayscale values ​​include 44, 63, 127, 192 and 255, and the brightness data and the chromaticity data corresponding to the grayscale values ​​of 63, 127 and 255 are output.

[0009] For example, in a method for eliminating chromatic aberration of a display module provided in at least one embodiment of the present disclosure, the method for determining the target color coordinates includes: collecting the color coordinate distribution of sub-millimeter LED light panels of different batches; selecting the sub-millimeter LED light panels having a first color coordinate center value; collecting the color coordinate distribution of quantum dot film diffusers of different batches; selecting the quantum dot film diffuser having a second color coordinate center value; using the sub-millimeter LED light panel having the first color coordinate center value and the quantum dot film diffuser having the second color coordinate center value to form the display module, and testing the color coordinates at a first grayscale value as the target color coordinates of the display module.

[0010] For example, in a method for eliminating color difference of a display module provided in at least one embodiment of the present disclosure, the method for determining the target color coordinates includes: after collecting the color coordinates within the display module, using the color coordinate center value within 10% of the area located in the center of a single display module or the color coordinate center value of the entire area within the display module as the target color coordinates of the display module.

[0011] For example, in a method for eliminating color difference of a display module provided in at least one embodiment of the present disclosure, the method for determining the target color coordinates includes: setting the specified target color coordinates to the center value of the color coordinates of the display module adjusted by software.

[0012] For example, in a method for eliminating chromatic aberration of a display module provided in at least one embodiment of the present disclosure, the method for determining the target brightness includes: collecting the brightness distribution of sub-millimeter LED light boards of different batches, and selecting the sub-millimeter LED light board with the highest brightness; collecting the brightness distribution of quantum dot film diffuser plates of different batches, and selecting the quantum dot film diffuser plate with the highest brightness; using the sub-millimeter LED light board with the highest brightness and the quantum dot film diffuser plate with the highest brightness to form the display module, and testing 95% of the brightness of the display module when the grayscale value is 255 as the target brightness of the display module.

[0013] For example, in a method for eliminating chromatic aberration of a display module provided in at least one embodiment of the present disclosure, the method for determining the target brightness includes: collecting the brightness distribution of sub-millimeter LED light boards of different batches, and selecting the sub-millimeter LED light board with the brightness as the center value; collecting the brightness distribution of quantum dot film diffuser plates of different batches, and selecting the quantum dot film diffuser plate with the brightness as the center value; using the sub-millimeter LED light board with the brightness as the center value and the quantum dot film diffuser plate with the brightness as the center value to form the display module, and testing 95% of the brightness of the display module when the grayscale value is 255 as the target brightness of the display module.

[0014] For example, in a method for eliminating chromatic aberration of a display module provided in at least one embodiment of the present disclosure, the method for determining the target brightness includes: collecting the brightness distribution of sub-millimeter LED light boards of different batches, and selecting the sub-millimeter LED light board with the lowest brightness; collecting the brightness distribution of quantum dot film diffuser plates of different batches, and selecting the quantum dot film diffuser plate with the lowest brightness; using the sub-millimeter LED light board with the lowest brightness and the quantum dot film diffuser plate with the lowest brightness to form the display module for testing 95% of the brightness of the display module when the grayscale value is 255, as the target brightness of the display module.

[0015] For example, in a method for eliminating color difference of a display module provided by at least one embodiment of the present disclosure, the multiple areas include 480x270 block areas, and calculating the color coordinate difference between the chromaticity data corresponding to the multiple areas at the multiple grayscale values ​​and the target color coordinates includes separately calculating the color coordinate difference of each of the block areas at the multiple grayscale values; calculating the brightness difference between the brightness data corresponding to the multiple areas at the multiple grayscale values ​​and the target brightness includes separately calculating the brightness difference of each of the block areas at the multiple grayscale values.

[0016] For example, in a method for eliminating color difference of a display module provided in at least one embodiment of the present disclosure, each of the block areas corresponds to 1x1 pixels, 2x2 pixels, 4x4 pixels, 8x8 pixels or 16x16 pixels.

[0017] At least one embodiment of the present disclosure further provides a method for eliminating color difference of a spliced ​​screen, and the method for eliminating color difference of a spliced ​​screen includes: the method for eliminating color difference of a display module according to any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure.

[0019] Figure 1 It is a schematic diagram of the planar structure of a spliced ​​screen;

[0020] Figure 2 for Figure 1 The cross-sectional structure diagram of the display module included in the spliced ​​screen shown;

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of a quantum dot film diffuser;

[0022] Figure 4 A schematic cross-sectional structure diagram of a portion of a spliced ​​screen formed by splicing a first display module and a second display module;

[0023] Figure 5 This is a display screen diagram showing uneven brightness within a single display module;

[0024] Figure 6 A display screen diagram showing uneven brightness between adjacent display modules;

[0025] Figure 7 A flow chart of a method for eliminating color difference of a display module provided by at least one embodiment of the present disclosure;

[0026] Figure 8 A flowchart of another method for eliminating color difference of a display module provided for at least one embodiment of the present disclosure; and

[0027] Fig. 9 A diagram showing a display screen of a spliced ​​screen provided in at least one embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0029] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] Unless otherwise defined, the features such as "parallel", "perpendicular" and "same" used in the embodiments of the present invention include the situations of "parallel", "perpendicular", "same" in a strict sense, as well as the situations of "approximately parallel", "approximately perpendicular", "approximately the same", etc., which contain certain errors. For example, the above-mentioned "approximately" may mean that the difference of the compared objects is within 10% or 5% of the average value of the compared objects. When the number of a component or element is not specifically indicated in the following text of the embodiments of the present invention, it means that the component or element may be one or more, or may be understood as at least one. "At least one" refers to one or more, and "multiple" refers to at least two. The "same-layer arrangement" in the embodiments of the present invention refers to the relationship between multiple film layers formed by the same material after the same step (for example, a one-step patterning process). The "same layer" here does not always mean that the thickness of multiple film layers is the same or the height of multiple film layers in the cross-sectional view is the same.

[0031] Figure 1 It is a schematic diagram of the plane structure of a spliced ​​screen. Figure 2 for Figure 1 The spliced ​​screen shown in FIG. 1 includes a cross-sectional structural diagram of a display module, which is a liquid crystal display panel display module based on sub-millimeter light-emitting diodes as a backlight source, such as Figure 1 As shown, the spliced ​​screen 100 includes a plurality of display modules 200 which are sequentially connected in the row direction and the column direction. Figure 1 It is shown that the spliced ​​screen 100 is formed by splicing 9 display modules 200, but the number of display modules 200 included in the spliced ​​screen 100 is not limited thereto, and the spliced ​​screen 100 can also include other numbers of display modules 200, for example, 2, 4, 6, 12, etc. A plurality of display modules 200 are spliced ​​together, but there is a seam between any two adjacent display modules 200, and the presence of the seam will affect the display effect of the display module finally formed. For example, the display module 200 can be a liquid crystal display module, an organic light emitting diode (OLED) display module, or an electrophoretic display module. In the following embodiments, the display module 200 is a display module based on a liquid crystal display panel with sub-millimeter light emitting diodes as a backlight source as an example for explanation.

[0032] For example, Figure 2 As shown, the display module 200 includes a back panel 201, the overall structure of the back panel 201 is a bent structure, the first part 2011 of the back panel 201 is horizontally arranged, the second part 2012 of the back panel 201 supports the middle frame 202, a reflective film 203 is arranged on the first part 2011 of the back panel 201, a sub-millimeter light emitting diode 204 is arranged on the reflective film 203, a quantum dot film diffuser 205 is arranged on the side of the middle frame 202 away from the first part 2011 of the back panel 201, and a liquid crystal display panel 206 is arranged on the side of the quantum dot film diffuser 205 away from the first part 2011 of the back panel 201. The quantum dot film diffuser 205 and the liquid crystal display panel 206 are bonded by a first adhesive 207, a front frame 208 is provided on the side of the quantum dot film diffuser 205 and the liquid crystal display panel 206 and the side of the second portion 2012 of the back plate 201, and the top of the front frame 208 and the surface of the first portion 2011 of the liquid crystal display panel 206 away from the back plate 201 are bonded by a second adhesive 209. For example, Figure 2 As shown, since the edge of the supporting surface of the middle frame 202 for supporting the liquid crystal display panel 206 away from the center of the liquid crystal display panel 206 is less than or equal to 0.1 mm from the display area in the horizontal direction, when the components are offset during assembly in the process of preparing the display module, the supporting surface of the middle frame 202 for supporting the liquid crystal display panel 206 will enter the display area, so that the light emitted from the backlight source cannot enter this supporting surface area, which leads to the problem of edge pixels being blocked.

[0033] For example, sub-millimeter light emitting diodes 204 are usually used as the light source structure. Since the light emitted by the sub-millimeter light emitting diodes 204 has strong directionality, in order to make the light emitted by the sub-millimeter light emitting diodes 204 evenly mixed and form a uniform surface light source, it is necessary to set a diffusion plate above the sub-millimeter light emitting diodes 204. The diffusion plate is the quantum dot film diffusion plate 205, and it is necessary to keep a sufficient distance between the quantum dot film diffusion plate 205 and these sub-millimeter light emitting diodes 204. Therefore, the quantum dot film diffusion plate 205 needs to be set on the side of the first part 2011 of the middle frame 202 away from the back plate 201.

[0034] For example, a sub-millimeter light emitting diode that emits blue light is used as the sub-millimeter light emitting diode in the embodiment of the present disclosure. The wavelength of the chip included in the sub-millimeter light emitting diode that emits blue light is between 445 and 460 nm.

[0035] For example, the first part 2011 of the back plate 201 is a supporting structure for the sub-millimeter light-emitting diode 204 as a whole, and the sub-millimeter light-emitting diode 204 is attached to the first part 2011 of the back plate 201. The back plate 201 is fixed to the middle frame 202 by snapping or locking, and the material of the back plate 201 includes at least one of electrogalvanized steel sheet (SECC) and hot-dip galvanized steel sheet (SGCC). For example, the main function of the back plate 201 is to fix the sub-millimeter light-emitting diode, the middle frame, the reflective film and other components to support the strength of the entire display module.

[0036] For example, the main function of the middle frame 202 is to support the liquid crystal display panel 206 and the quantum dot film diffuser 205, and the supporting surface is used as the glue coating surface. The middle frame 202 can be made of aluminum material or plastic material, and is formed by extrusion molding or injection molding. The surface of the middle frame 202 through which light passes has a scattering effect on the light, that is, a scattering surface. There is a slope surface with a certain inclination angle between the scattering surface of the middle frame 202 and the first part 2011 of the back plate 201. The function of the slope surface is to scatter the light emitted by the sub-millimeter light emitting diode 204 at the edge position, that is, the light emitted by the sub-millimeter light emitting diode 204 at the edge position will be scattered after passing through the slope surface of the middle frame 202, so that this part of the light is easier to reach the display area of ​​the liquid crystal display panel 206, so as to reduce the phenomenon of dark frames.

[0037] For example, the quantum dot film diffuser 205 is a composite layer structure of a quantum dot film and a glass diffuser, that is, an integrated structure formed by a composite of a glass-based diffuser and a quantum dot film layer. Figure 3 A schematic diagram of the cross-sectional structure of a quantum dot film diffuser. Figure 2 and Figure 3As shown, the main structure of the quantum dot film diffuser 205 is an optical glass substrate 2051, which plays a role in supporting the overall film material structure. The back of the optical glass substrate 2051 is a shielding layer 2052, which is formed by ink printing technology. The main function of the shielding layer 2052 is to improve the shielding property, cover the light spot of the light source, and make the light emitted from the sub-millimeter light-emitting diode 204 more uniform. The front of the optical glass substrate 2051 is a quantum dot film 2053, that is, the quantum dot film 2053 and the optical glass substrate 2051 are bonded into an integrated structure by OCA optical glue; a layer of reflective polarizer 2054 is compounded on the quantum dot film 2053, and the reflective polarizer 2054 selectively reflects the polarized light of the backlight system so that it is not absorbed by the lower polarizer of the liquid crystal display panel 206, so as to improve the utilization rate of the full-viewing angle light, thereby increasing the display brightness of the display module by 30% to 40%.

[0038] For example, the first adhesive 207 and the second adhesive 209 may be transparent optical adhesive, which is a special adhesive for bonding transparent optical elements. The first adhesive 207 and the second adhesive 209 may also be thermosetting adhesive or ultraviolet curing adhesive, which is not limited in the embodiments of the present disclosure.

[0039] It should be noted that a light-shielding tape is also provided on the outside of the display module. The material of the light-shielding tape is black PET material. The main function of the light-shielding tape is to block the edge of the liquid crystal display panel and the light leaking from the backlight to prevent the display module from leaking light. At the same time, the light-shielding tape serves as an external surface and plays a role in aesthetics. The light-shielding tape is generally attached from the edge of the upper polarizer to the bottom of the side wall of the display module.

[0040] For example, the liquid crystal display panel 206 includes an upper glass substrate and a lower glass substrate, and a liquid crystal layer sandwiched between the upper glass substrate and the lower glass substrate.

[0041] Despite Figure 2 Not shown, the display module may also include a prism film. The prism film is an optical film material having a peak-shaped structure on its surface. The peak-shaped structure has the function of converging light and can improve the formal angular brightness of the display module, but will cause the large-angle brightness of the display module to decrease.

[0042] For example, Figure 4 A schematic cross-sectional structure diagram of a portion of a spliced ​​screen formed by splicing a first display module and a second display module, such as Figure 4As shown, the width of the seam is relatively large, and both the left and right sides of the seam are display areas. The first display module and the second display module both include a liquid crystal display panel 206, an upper polarizer 210 located on the side of the liquid crystal display panel 206 away from the middle frame 202, and a lower polarizer 211 located on the side of the liquid crystal display panel 206 close to the middle frame 202. The lower polarizer 211 and the quantum dot film diffuser 205 are connected by a first adhesive 207, and the middle frame 202 is connected to the quantum dot film diffuser 205 by a thermosetting adhesive 213. A light shielding tape 212 is provided on the outside of the display module, and the features of the light shielding tape 212 can be referred to the relevant description above.

[0043] The other structures included in the display module can refer to conventional designs, and the embodiments of the present disclosure are not limited to this.

[0044] For example, the sub-millimeter LED 204 has the problem of light source color difference. The characteristic of sub-millimeter LED backlight technology is that the number of sub-millimeter LEDs is large, reaching thousands to tens of thousands, and fine partition light control can be achieved, and the display quality of the display panel is better than that of ordinary LED backlight sources. However, due to the different chip wavelengths and luminous brightness of sub-millimeter LEDs, as well as the tolerance of the coating thickness of white oil on the lamp board in the manufacturing process, the tolerance of the amount of protective glue on the sub-millimeter LED, etc., there are differences in brightness and chromaticity at different positions of the sub-millimeter LED lamp board or between different sub-millimeter LED lamp boards, which in turn affects the consistency of brightness and chromaticity of the display screen of the display module. At present, it is necessary to distinguish different luminous colors and display brightness through the careful selection of different wavelengths of light emitted by sub-millimeter LEDs and different display brightnesses to reduce the differences in brightness and chromaticity, but the selection requires huge manpower costs and equipment investment, resulting in excessively high costs of lamp boards, and can only reduce but not completely avoid the differences in brightness and chromaticity of the lamp boards.

[0045] For example, the quantum dot diffusion plate has a film color difference problem. Due to the uneven coating of the quantum dot film during the production process, the quantum dots will have different excitation efficiencies after being excited by the sub-millimeter light-emitting diodes that emit blue light, which will produce differences in brightness and color, thus affecting the brightness and color consistency of the module screen. At present, the uneven coating of the quantum dot film layer cannot be avoided even through process optimization.

[0046] For example, currently there are still problems of dark frames and blocked edge pixels around a single display module. When multiple display modules are actually spliced ​​to form a spliced ​​screen, the width of the dark frame will double. That is, in the technical field of spliced ​​screens, the width of the border of a single display module will directly affect the width of the splicing seam of the spliced ​​screen formed after splicing, which in turn will affect the overall display effect of the spliced ​​screen. That is, in a spliced ​​screen of a liquid crystal display panel based on sub-millimeter light emitting diodes as a backlight source, there are problems of uneven display brightness and color within a single display module, as well as uneven display brightness and color between different display modules, which results in poor display effect of the spliced ​​screen and seriously affects the viewer experience. Therefore, the splicing screen has higher requirements for the width of the frame, that is, the display module forming the splicing screen needs to have a narrower frame, otherwise the middle frame will block the light and cause a dark frame, and the edge pixels will be blocked, causing the dark area at the edge to increase. The splicing of multiple display modules will cause the width of the dark frame to double, which will increase the dark area at the edge, resulting in uneven display brightness and color of the display screen, as well as a deterioration of the splicing effect. However, structural improvements to the splicing screen can only make the width of the splicing seam as small as possible.

[0047] For example, Figure 5 This is a display screen diagram showing uneven brightness within a single display module; Figure 6 This is a display screen diagram showing uneven brightness between adjacent display modules. Figure 5 It can be seen that there are obvious alternating light and dark stripes in the display image. Figure 6 It can be seen that there is an obvious dark frame in the middle between two adjacent display modules, and the display brightness of the display module on the left is different from that of the display module on the right.

[0048] Based on the above problems, the inventors of the present invention noticed that a color difference elimination algorithm can be designed, that is, by enabling the display module to perform grayscale compensation for the red display image, the green display image and the blue display image in each pixel area or divided block at multiple different grayscales for the driving terminals of the display screen, thereby achieving the effect of eliminating the uneven display brightness and the uneven chromaticity of the display module.

[0049] At least one embodiment of the present disclosure provides a method for eliminating color difference of a display module and a method for eliminating color difference of a spliced ​​screen. The method for eliminating color difference of a display module and the method for eliminating color difference of a spliced ​​screen achieve the effect of eliminating uneven display brightness and uneven chromaticity of the display module by making the display module compensate the grayscale of the red display picture, the green display picture and the blue display picture in each pixel area or divided block for the driving terminal of the display screen under multiple different grayscales, and by optimizing the number of pixel areas or divided blocks, optimizing the chromaticity target value and the setting method of the brightness target value, compensating the sub-millimeter light-emitting diode driving board, etc., to ensure the difference between the same display module and different display modules, and improve the module brightness reduction ratio, to ensure that the module brightness meets the product specifications. In addition, the embodiment of the present disclosure also solves the problem of uneven brightness and uneven chromaticity of the display module caused by large color difference when the sub-millimeter light-emitting diode and the quantum dot film forming the quantum dot light-emitting layer fluctuate, and reduces the high cost caused by the uneven brightness and uneven chromaticity of the sub-millimeter light-emitting diode, so that it has been widely used in the application scenarios of spliced ​​screens.

[0050] At least one embodiment of the present disclosure provides a method for eliminating color difference of a display module. Figure 7 A flowchart of a method for eliminating color difference of a display module provided in at least one embodiment of the present disclosure is shown in FIG. Figure 7 As shown, the method for eliminating color difference of the display module includes the following steps:

[0051] Step S101: collecting brightness data and chromaticity data of a display module at multiple grayscale values.

[0052] For example, an imaging meter may be used to collect brightness data and chromaticity data of a display module at each grayscale value. The brightness data and chromaticity data of a display module at each grayscale value may be directly and accurately read through the imaging meter.

[0053] For example, the human eye perceives the color and brightness of light of different wavelengths differently, and the imaging brightness / colorimeter included in the imaging meter needs to conform to the CIE visual function. When the brightness and colorimetry data provided by the imaging brightness / colorimeter can match the CIE visual function, the result is consistent with the perception of the human eye. For example, commonly used imaging brightness / colorimeter include CV2000, BV2000, LV2000, etc.

[0054] For example, when collecting the brightness data and chromaticity data of the display module, multiple grayscale values ​​include 44, 63, 127, 192 and 255, and the output grayscale values ​​are 63, 127 and 255 corresponding to the brightness data and chromaticity data. It should be noted that the grayscale value of the output data can be adjusted to other values ​​according to design requirements.

[0055] Step S102: extracting brightness data and chromaticity data corresponding to a plurality of regions at a plurality of grayscale values.

[0056] For example, taking the case where the brightness data and chromaticity data of the display module are collected when the grayscale value is 255, and the brightness data and chromaticity data corresponding to multiple regions when the grayscale value is 255 are extracted as an example, the method of collecting the brightness data and chromaticity data of the display module at other grayscale values ​​and extracting the brightness data and chromaticity data corresponding to multiple regions at the corresponding grayscale values ​​is similar.

[0057] For example, in one example, considering the color difference elimination effect and T-con IC processing capability, a 4x4 pixel block area can be used for adjustment, that is, when the resolution of the corresponding display screen is 1920x1080, there are a total of 480x270 pixel block areas, and each pixel block area separately calculates its color coordinates and brightness value. For example, calculating the color coordinate difference between the chromaticity data corresponding to multiple areas at multiple grayscale values ​​and the target color coordinates includes separately calculating the color coordinate difference of each block area at multiple grayscale values; calculating the brightness difference between the brightness data corresponding to multiple areas at multiple grayscale values ​​and the target brightness includes separately calculating the brightness difference of each block area at multiple grayscale values.

[0058] For example, in another example, the 4x4 pixel block area can be enlarged or reduced by combining the T-con processing capability and the actual effect of the display screen of the spliced ​​screen. For example, T-con has strong processing capability and extremely high requirements for the display quality of the spliced ​​screen. For example, 2x2 pixel block areas or even 1x1 pixel block areas can be used, but the chromaticity and brightness loss of color difference adjustment will increase, affecting production efficiency and brightness specifications. For example, in other examples, 8x8 pixel block areas or 16x16 pixel block areas can be set. On the basis of satisfying the color difference adjustment effect, the adjustment efficiency of the spliced ​​screen can be improved and the brightness loss of the spliced ​​screen can be reduced.

[0059] Step S103: calculating the color coordinate difference between the chromaticity data corresponding to the plurality of regions at the plurality of grayscale values ​​and the target color coordinate.

[0060] For example, to calculate the color coordinate difference between the chromaticity data corresponding to multiple regions under multiple grayscale values ​​and the target color coordinates, it is necessary to first set the target value of the chromaticity data of the display module. The method for setting the target value of the chromaticity data includes: collecting the color coordinate distribution of sub-millimeter light-emitting diode light panels of different batches, and selecting the sub-millimeter light-emitting diode light panels with the color coordinate center value; collecting the color coordinate distribution of quantum dot film diffusers of different batches, and selecting the quantum dot film diffuser with the color coordinate center value; using the sub-millimeter light-emitting diode light panel with the color coordinate center value and the quantum dot film diffuser with the color coordinate center value to form a display module, and testing the color coordinates at the grayscale value of 255 as the target value of the chromaticity of the display module.

[0061] For example, the color coordinate center value of the sub-millimeter light emitting diode light panel is a first color coordinate center value, and the color coordinate center value of the quantum dot film diffuser is a second color coordinate center value.

[0062] For example, the advantage of using the chromaticity center value of the display module as the target value is that the color coordinate values ​​of the display module with the maximum chromaticity value and the color coordinate values ​​of the display module with the minimum chromaticity value are both less different from the chromaticity center value, thereby avoiding the excessive difference between the target value and the color coordinate value of the display module with the maximum chromaticity value and the color coordinate value of the display module with the minimum chromaticity value. As the greater the difference between the color coordinate value and the target value, the greater the brightness loss of the spliced ​​screen after adjustment, which will cause the problem of excessive display brightness loss of the spliced ​​screen formed in the end, therefore, it is necessary to use the chromaticity center value of the display module as the target value to reduce the difference between the color coordinate value and the target value.

[0063] Then, the collected color coordinate values ​​of the display module are compared with the set target color coordinates to calculate the difference, and finally the grayscale compensation data is calculated based on the difference. Adjusting the color coordinate values ​​of the display module is the first priority, and the brightness of the spliced ​​screen needs to be adjusted after the color coordinate values ​​are adjusted.

[0064] For example, in one embodiment, when setting the color coordinate target value of the display module, if the customer has specified the color coordinate target value of the display module and the color coordinate target value is strictly controlled, for example, it is less than the accuracy of the software adjustment, then the color coordinate value specified by the customer needs to be set to the color coordinate center value of the display module adjusted by the software. The advantage of this solution is that the color coordinate center value has high accuracy and can be highly matched with the color coordinate value specified by the customer to meet customer needs. However, there may be situations where the brightness loss of some display modules is higher than the color coordinate target value of the display module that the customer has not specified. This solution is suitable for situations where the customer specifies the product color coordinate specifications and has high requirements for color coordinate accuracy.

[0065] For example, in another embodiment, when setting the color coordinate target value of the display module, the color coordinate target value can be decomposed into two steps: adjusting the color coordinates within a display module and adjusting the color coordinates between different display modules. The specific method is: after collecting the color coordinates within a display module, the color coordinate center value within the 10% area of ​​the center of a single display module is used as the color coordinate target value within the display module for adjustment; or the color coordinate center value of all regions within the display module is used as the color coordinate target value within the display module for adjustment. After the adjustment, the color coordinates within the display module are close to the same, eliminating the difference in color coordinates within the display module; all display modules are adjusted according to the given display module color coordinate target value. The advantage of this solution is that after two adjustments, the color coordinate accuracy of each area of ​​the display module is relatively high. This solution is suitable for situations where the color coordinate accuracy of different areas within the display module is required to be relatively high.

[0066] Step S104: calculating the brightness difference between the brightness data corresponding to the plurality of regions at the plurality of grayscale values ​​and the target brightness.

[0067] For example, collect the brightness distribution of sub-millimeter light-emitting diode light panels of different batches, and select the sub-millimeter light-emitting diode light panel with the maximum brightness; collect the brightness distribution of quantum dot film diffuser panels of different batches, and select the quantum dot film diffuser panel with the maximum brightness; test the brightness of the display module composed of the sub-millimeter light-emitting diode light panel with the maximum brightness and the quantum dot film diffuser panel with the maximum brightness at 95% under the condition of a grayscale value of 255, as the target value of the brightness of the display module. Since the brightness of the display module can only be reduced and not increased when the color difference is adjusted under the condition of a grayscale value of 255, the coefficient of brightness reduction of 95% should be preset. Since the display module in the embodiment of the present disclosure has high requirements for brightness and power, and the influence of the brightness of the display module on the color difference of the display screen is smaller than the influence of the chromaticity on the color difference of the display screen. Therefore, under the premise of satisfying the color difference of the display screen, the brightness target value of the display module is set to 95% of the maximum brightness value of the display module, that is, after adjusting the brightness of the display module, the maximum value of the brightness of the display module cannot be higher than this target setting value. This setting is conducive to minimizing the brightness loss of the display module in the process of adjusting the color difference of the display module.

[0068] For example, in another embodiment, when setting the target brightness value of the display module, the center brightness value of different display modules is used as the target brightness value. The specific setting method is: collect the brightness distribution of sub-millimeter LED light panels from different batches, and select the sub-millimeter LED light panel with the center brightness value; collect the brightness distribution of quantum dot film diffuser plates from different batches, and select the quantum dot film diffuser plate with the center brightness value; use the sub-millimeter LED light panel with the center brightness value and the quantum dot film diffuser plate with the center brightness value to form a display module, and test 95% of the brightness of the display module when the grayscale value is 255 as the target brightness of the display module. The advantage of this solution is to correct the display module with too high brightness, so that the brightness of the adjusted display module is within the range of the center value.

[0069] For example, in another embodiment, when setting the target brightness value of the display module, the lowest brightness value of different display modules is used as the target brightness value. The specific setting method is: collect the brightness distribution of sub-millimeter LED light panels from different batches, and select the sub-millimeter LED light panel with the lowest brightness; collect the brightness distribution of quantum dot film diffuser panels from different batches, and select the quantum dot film diffuser panel with the lowest brightness; use the sub-millimeter LED light panel with the lowest brightness and the quantum dot film diffuser panel with the lowest brightness to form a display module test. When the grayscale value is 255, 95% of the brightness of the display module is used as the target brightness of the display module. Compared with the solution that uses the brightness center value of different display modules as the target brightness value, this solution can further correct the brightness of the display module so that the brightness of all display modules after adjustment is within the range of the brightness of the lowest display module. The main advantage of this solution is that the brightness difference of all display modules is the lowest, and the display consistency of the spliced ​​screen formed by splicing multiple display modules is optimal.

[0070] For example, when the minimum brightness of the display module is used as the brightness target value of the display module, when the brightness of the adjusted display module is less than the set brightness target value, the driving current of the light-emitting diode driving board at the corresponding position is increased according to the difference between the brightness of the adjusted display module and the target value brightness, so as to serve as brightness compensation for the area where the display module has insufficient brightness.

[0071] Step S105: Calculating compensation data at each grayscale value according to the color coordinate difference and the brightness difference.

[0072] For example, the collected brightness data of the display module is compared with the set target brightness value to calculate the difference, and finally the grayscale compensation data is calculated based on the difference.

[0073] Step S106: Generate a first type of compensation result.

[0074] For example, the first type of compensation result is a csv file.

[0075] Step S107: converting the first type of compensation result into a second type of file, and storing it in the display module to form color difference elimination data.

[0076] For example, the second type of file is a bin file, that is, the csv file is converted into a bin file.

[0077] Step S108: the display screen driving board reads the color difference elimination data and drives the display screen to display.

[0078] For example, the display screen driver board is T-con.

[0079] For example, the method for eliminating color difference of the display module enables the display module to perform grayscale compensation for the red display picture, the green display picture and the blue display picture in each pixel area or divided block on the driving terminal of the display screen under multiple different grayscales, thereby achieving the effect of eliminating the uneven display brightness and the uneven chromaticity of the display module.

[0080] For example, at least one embodiment of the present disclosure also provides another method for eliminating color difference of a display module. Figure 8 A flowchart of another method for eliminating color difference of a display module provided in at least one embodiment of the present disclosure, such as Figure 8 As shown, the method for eliminating color difference of the display module includes the following steps:

[0081] Step S201: collecting brightness data and chromaticity data of a display module at multiple grayscale values.

[0082] For example, an imaging meter may be used to collect brightness data and chromaticity data of a display module at each grayscale value. The brightness data and chromaticity data of a display module at each grayscale value may be directly and accurately read through the imaging meter.

[0083] For example, the human eye perceives the color and brightness of light of different wavelengths differently, and the imaging brightness / colorimeter included in the imaging meter needs to conform to the CIE visual function. When the brightness and colorimetry data provided by the imaging brightness / colorimeter can match the CIE visual function, the result is consistent with the perception of the human eye. For example, commonly used imaging brightness / colorimeter include CV2000, BV2000, LV2000, etc.

[0084] For example, when collecting the brightness data and chromaticity data of the display module, multiple grayscale values ​​include 44, 63, 127, 192 and 255, and the output grayscale values ​​are 63, 127 and 255 corresponding to the brightness data and chromaticity data. It should be noted that the grayscale value of the output data can be adjusted to other values ​​according to design requirements.

[0085] Step S202: extracting brightness data and chromaticity data corresponding to a plurality of regions at a plurality of grayscale values.

[0086] For example, taking the case where the brightness data and chromaticity data of the display module are collected when the grayscale value is 255, and the brightness data and chromaticity data corresponding to multiple regions when the grayscale value is 255 are extracted as an example, the method of collecting the brightness data and chromaticity data of the display module at other grayscale values ​​and extracting the brightness data and chromaticity data corresponding to multiple regions at the corresponding grayscale values ​​is similar.

[0087] For example, in one example, considering the color difference elimination effect and T-con IC processing capability, a 4x4 pixel block area can be used for adjustment, that is, when the resolution of the corresponding display screen is 1920x1080, there are a total of 480x270 pixel block areas, and each pixel block area calculates its color coordinates and brightness value separately.

[0088] For example, in another example, the 4x4 pixel block area can be enlarged or reduced by combining the T-con processing capability and the actual effect of the display screen of the spliced ​​screen. For example, T-con has strong processing capability and extremely high requirements for the display quality of the spliced ​​screen. For example, 2x2 pixel block areas or even 1x1 pixel block areas can be used, but the chromaticity and brightness loss of color difference adjustment will increase, affecting production efficiency and brightness specifications. For example, in other examples, 8x8 pixel block areas or 16x16 pixel block areas can be set. On the basis of satisfying the color difference adjustment effect, the adjustment efficiency of the spliced ​​screen can be improved and the brightness loss of the spliced ​​screen can be reduced.

[0089] Step S203: Calculating the color coordinate differences between the chromaticity data corresponding to the plurality of regions at the plurality of grayscale values ​​and the target color coordinates.

[0090] For example, to calculate the color coordinate difference between the chromaticity data corresponding to multiple regions under multiple grayscale values ​​and the target color coordinates, it is necessary to first set the target value of the chromaticity data of the display module. The method for setting the target value of the chromaticity data includes: collecting the color coordinate distribution of sub-millimeter light-emitting diode light panels of different batches, and selecting the sub-millimeter light-emitting diode light panels with the color coordinate center value; collecting the color coordinate distribution of quantum dot film diffusers of different batches, and selecting the quantum dot film diffuser with the color coordinate center value; using the sub-millimeter light-emitting diode light panel with the color coordinate center value and the quantum dot film diffuser with the color coordinate center value to form a display module, and testing the color coordinates at the grayscale value of 255 as the target value of the chromaticity of the display module.

[0091] For example, the color coordinate center value of the sub-millimeter light emitting diode light panel is a first color coordinate center value, and the color coordinate center value of the quantum dot film diffuser is a second color coordinate center value.

[0092] For example, the advantage of using the chromaticity center value of the display module as the target value is that the color coordinate values ​​of the display module with the maximum chromaticity value and the color coordinate values ​​of the display module with the minimum chromaticity value are both less different from the chromaticity center value, thereby avoiding the excessive difference between the target value and the color coordinate value of the display module with the maximum chromaticity value and the color coordinate value of the display module with the minimum chromaticity value. As the greater the difference between the color coordinate value and the target value, the greater the brightness loss of the spliced ​​screen after adjustment, which will cause the problem of excessive display brightness loss of the spliced ​​screen formed in the end, therefore, it is necessary to use the chromaticity center value of the display module as the target value to reduce the difference between the color coordinate value and the target value.

[0093] Then, the collected color coordinate values ​​of the display module are compared with the set target color coordinates to calculate the difference, and finally the grayscale compensation data is calculated based on the difference. Adjusting the color coordinate values ​​of the display module is the first priority, and the brightness of the spliced ​​screen needs to be adjusted after the color coordinate values ​​are adjusted.

[0094] For example, in one embodiment, when setting the color coordinate target value of the display module, if the customer has specified the color coordinate target value of the display module and the color coordinate target value is strictly controlled, for example, it is less than the accuracy of the software adjustment, then the color coordinate value specified by the customer needs to be set to the color coordinate center value of the display module adjusted by the software. The advantage of this solution is that the color coordinate center value has high accuracy and can be highly matched with the color coordinate value specified by the customer to meet customer needs. However, there may be situations where the brightness loss of some display modules is higher than the color coordinate target value of the display module that the customer has not specified. This solution is suitable for situations where the customer specifies the product color coordinate specifications and has high requirements for color coordinate accuracy.

[0095] For example, in another embodiment, when setting the color coordinate target value of the display module, the color coordinate target value can be decomposed into two steps: adjusting the color coordinates within a display module and adjusting the color coordinates between different display modules. The specific method is: after collecting the color coordinates within a display module, the color coordinate center value within the 10% area of ​​the center of a single display module is used as the color coordinate target value within the display module for adjustment; or the color coordinate center value of all regions within the display module is used as the color coordinate target value within the display module for adjustment. After the adjustment, the color coordinates within the display module are close to the same, eliminating the difference in color coordinates within the display module; all display modules are adjusted according to the given display module color coordinate target value. The advantage of this solution is that after two adjustments, the color coordinate accuracy of each area of ​​the display module is relatively high. This solution is suitable for situations where the color coordinate accuracy of different areas within the display module is required to be relatively high.

[0096] Step S204: calculating the brightness difference between the brightness data corresponding to the plurality of regions at the plurality of grayscale values ​​and the target brightness.

[0097] For example, collect the brightness distribution of sub-millimeter light-emitting diode light panels of different batches, and select the sub-millimeter light-emitting diode light panel with the maximum brightness; collect the brightness distribution of quantum dot film diffuser panels of different batches, and select the quantum dot film diffuser panel with the maximum brightness; test the brightness of the display module composed of the sub-millimeter light-emitting diode light panel with the maximum brightness and the quantum dot film diffuser panel with the maximum brightness at 95% under the condition of a grayscale value of 255, as the target value of the brightness of the display module. Since the brightness of the display module can only be reduced and not increased when the color difference is adjusted under the condition of a grayscale value of 255, the coefficient of brightness reduction of 95% should be preset. Since the display module in the embodiment of the present disclosure has high requirements for brightness and power, and the influence of the brightness of the display module on the color difference of the display screen is smaller than the influence of the chromaticity on the color difference of the display screen. Therefore, under the premise of satisfying the color difference of the display screen, the brightness target value of the display module is set to 95% of the maximum brightness value of the display module, that is, after adjusting the brightness of the display module, the maximum value of the brightness of the display module cannot be higher than this target setting value. This setting is conducive to minimizing the brightness loss of the display module in the process of adjusting the color difference of the display module.

[0098] For example, in another embodiment, when setting the target brightness value of the display module, the center brightness value of different display modules is used as the target brightness value. The specific setting method is: collect the brightness distribution of sub-millimeter LED light panels from different batches, and select the sub-millimeter LED light panel with the center brightness value; collect the brightness distribution of quantum dot film diffuser plates from different batches, and select the quantum dot film diffuser plate with the center brightness value; use the sub-millimeter LED light panel with the center brightness value and the quantum dot film diffuser plate with the center brightness value to form a display module, and test 95% of the brightness of the display module when the grayscale value is 255 as the target brightness of the display module. The advantage of this solution is to correct the display module with too high brightness, so that the brightness of the adjusted display module is within the range of the center value.

[0099] For example, in another embodiment, when setting the target brightness value of the display module, the lowest brightness value of different display modules is used as the target brightness value. The specific setting method is: collect the brightness distribution of sub-millimeter LED light panels from different batches, and select the sub-millimeter LED light panel with the lowest brightness; collect the brightness distribution of quantum dot film diffuser panels from different batches, and select the quantum dot film diffuser panel with the lowest brightness; use the sub-millimeter LED light panel with the lowest brightness and the quantum dot film diffuser panel with the lowest brightness to form a display module test. When the grayscale value is 255, 95% of the brightness of the display module is used as the target brightness of the display module. Compared with using the brightness center value of different display modules as the target brightness value, this solution can further correct the brightness of the display module so that the brightness of all display modules after adjustment is within the range of the brightness of the lowest display module. The main advantage of this solution is that the brightness difference of all display modules is the lowest, and the display consistency of the spliced ​​screen formed by splicing multiple display modules is optimal.

[0100] For example, when the minimum brightness of the display module is used as the brightness target value of the display module, when the brightness of the adjusted display module is less than the set brightness target value, the driving current of the light-emitting diode driving board at the corresponding position is increased according to the difference between the brightness of the adjusted display module and the target value brightness, so as to serve as brightness compensation for the area where the display module has insufficient brightness.

[0101] Step S205: Calculating compensation data of the LED driving board according to the color coordinate difference and the brightness difference.

[0102] For example, the problem of insufficient brightness of the display module can be solved by using power compensation of sub-millimeter LED light panels. The specific setting method is: take the brightness specification of the display module as the brightness target value of the display module; if the brightness of the adjusted display module is less than the set brightness target value, then increase the driving current of the sub-millimeter LED light panel at the corresponding position according to the difference ratio between the adjusted brightness and the brightness target value, as brightness compensation for the insufficient brightness area of ​​the display module. The advantage of this solution is that the brightness and chromaticity between display modules can be adjusted and controlled within a smaller range. This embodiment is suitable for situations where the brightness and chromaticity differences between display modules are required to be small, and where the power fluctuation requirements between display modules are not strict.

[0103] Step S206: Calculating compensation data at each grayscale value according to the color coordinate difference and the brightness difference.

[0104] For example, the collected brightness data of the display module is compared with the set target brightness value to calculate the difference, and finally the grayscale compensation data is calculated based on the difference.

[0105] Step S207: Generate a first type of compensation result.

[0106] For example, the first type of compensation result is a csv file.

[0107] Step S208: converting the first type of compensation result into a second type of file, and storing it in the display module to form color difference elimination data.

[0108] For example, the second type of file is a bin file, that is, the csv file is converted into a bin file.

[0109] Step S209: the display screen driving board reads the color difference elimination data and drives the display screen to display.

[0110] For example, the display screen driver board is T-con.

[0111] For example, the method for eliminating color difference of the display module enables the display module to perform grayscale compensation for the red display picture, the green display picture and the blue display picture in each pixel area or divided block on the driving terminal of the display screen under multiple different grayscales, thereby achieving the effect of eliminating the uneven display brightness and the uneven chromaticity of the display module.

[0112] At least one embodiment of the present disclosure further provides a method for eliminating color difference of a spliced ​​screen, and the method for eliminating color difference of a spliced ​​screen includes: the method for eliminating color difference of a display module according to any of the above embodiments, and the method for eliminating color difference of a spliced ​​screen is not described in detail here.

[0113] For example, Fig. 9 A display screen diagram of a spliced ​​screen provided in at least one embodiment of the present disclosure, from Fig. 9 It can be seen from the figure that the brightness and chromaticity of the display screen of each display module included in the spliced ​​screen are uniform, that is, it is a display effect diagram after the color difference elimination method of the display module provided in the embodiment of the present disclosure is optimized.

[0114] For example, according to an embodiment of the present disclosure, the measured difference values ​​of brightness and chromaticity at 9 points on the spliced ​​screen are compared before and after the color difference adjustment. It can be seen that the color coordinate difference decreases from △x=5.6‰, △y=8.8‰ to △x=2.1‰, △y=2.5‰, and the brightness difference decreases from △Lv=8% to △Lv=3%. The uneven brightness and chromaticity of the display module have been effectively improved.

[0115] The color difference elimination method of the display module and the color difference elimination method of the spliced ​​screen provided by at least one embodiment of the present disclosure have the following beneficial technical effects: by enabling the display module to perform grayscale compensation for the red display picture, the green display picture and the blue display picture in each pixel area or divided block on the driving terminals of the display screen under multiple different grayscales, the effect of eliminating the uneven display brightness of the display module and eliminating the uneven chromaticity of the display module is achieved.

[0116] There are a few points to note:

[0117] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0118] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of layers or regions is enlarged or reduced, that is, these drawings are not drawn according to the actual scale.

[0119] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0120] The above description is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. The protection scope of the present disclosure shall be based on the protection scope of the claims.

Claims

1. A method for eliminating color difference of a display module, comprising: Collect brightness data and chromaticity data of the display module at multiple grayscale values; Extracting the brightness data and the chromaticity data corresponding to a plurality of regions at the plurality of grayscale values; Calculating the color coordinate difference between the chromaticity data corresponding to the multiple regions at the multiple grayscale values ​​and the target color coordinate; Calculating the brightness difference between the brightness data corresponding to the multiple regions at the multiple grayscale values ​​and the target brightness; Calculating compensation data at each of the grayscale values ​​according to the color coordinate difference and the brightness difference; Generate the first type of compensation results; Converting the first type of compensation result into a second type of file, and storing the second type of file in the display module to form color difference elimination data; The display screen driving board reads the color difference elimination data and drives the display screen to display.

2. The method for eliminating color difference of a display module according to claim 1, wherein: After calculating the brightness difference between the brightness data corresponding to the multiple areas at the multiple grayscale values ​​and the target brightness, and before calculating the compensation data at each grayscale value based on the color coordinate difference and the brightness difference, it also includes calculating the compensation data of the light-emitting diode driving board based on the color coordinate difference and the brightness difference.

3. The method for eliminating color difference of a display module according to claim 2, wherein: Taking the minimum brightness of the display module as the brightness target value of the display module; When the adjusted brightness of the display module is less than the set brightness target value, the driving current of the LED driving board at the corresponding position is increased according to the difference between the adjusted brightness of the display module and the target brightness value to serve as brightness compensation for the insufficient brightness area of ​​the display module.

4. The method for eliminating color difference of a display module according to any one of claims 1 to 3, wherein: When collecting the brightness data and the chromaticity data of the display module, the multiple grayscale values ​​include 44, 63, 127, 192 and 255, and the brightness data and the chromaticity data corresponding to the grayscale values ​​of 63, 127 and 255 are output.

5. The method for eliminating color difference of a display module according to claim 4, wherein: The method for determining the target color coordinates includes: Collect the color coordinate distribution of different batches of sub-millimeter LED light panels; Selecting the sub-millimeter light emitting diode light panel having a first color coordinate center value; Collect the color coordinate distribution of different batches of quantum dot film diffusers; Select the quantum dot film diffuser plate having a second color coordinate center value; The display module is composed of the sub-millimeter light emitting diode light panel having the first color coordinate center value and the quantum dot film diffuser having the second color coordinate center value, and the color coordinates at the first grayscale value are tested as the target color coordinates of the display module.

6. The method for eliminating color difference of a display module according to claim 4, wherein: The method for determining the target color coordinates includes: After the color coordinates in the display module are collected, the color coordinate center value within 10% of the area in the center of a single display module or the color coordinate center value of the entire area in the display module is used as the target color coordinate of the display module.

7. The method for eliminating color difference of a display module according to claim 4, wherein: The method for determining the target color coordinates includes: setting the designated target color coordinates as the center value of the color coordinates of the display module adjusted by software.

8. The method for eliminating color difference of a display module according to any one of claims 5 to 7, wherein: The method for determining the target brightness includes: Collect the brightness distribution of different batches of sub-millimeter light emitting diode light panels, and select the sub-millimeter light emitting diode light panel with the greatest brightness; Collecting the brightness distribution of quantum dot film diffuser plates from different batches, and selecting the quantum dot film diffuser plate with the greatest brightness; The display module is composed of the sub-millimeter light emitting diode light panel with the highest brightness and the quantum dot film diffuser with the highest brightness, and 95% of the brightness of the display module when the grayscale value is 255 is tested as the target brightness of the display module.

9. The method for eliminating color difference of a display module according to any one of claims 5 to 7, wherein: The method for determining the target brightness includes: Collect the brightness distribution of different batches of sub-millimeter LED light panels, and select the sub-millimeter LED light panel with the brightness as the center value; Collect the brightness distribution of quantum dot film diffuser plates from different batches, and select the quantum dot film diffuser plate with a brightness as a center value; The display module is composed of the sub-millimeter light emitting diode light panel with the brightness as the center value and the quantum dot film diffuser with the brightness as the center value, and 95% of the brightness of the display module when the grayscale value is 255 is tested as the target brightness of the display module.

10. The method for eliminating color difference of a display module according to any one of claims 5 to 7, wherein: The method for determining the target brightness includes: Collect the brightness distribution of different batches of sub-millimeter light emitting diode light panels, and select the sub-millimeter light emitting diode light panel with the lowest brightness; Collecting the brightness distribution of quantum dot film diffuser plates from different batches, and selecting the quantum dot film diffuser plate with the lowest brightness; The display module is composed of the sub-millimeter light emitting diode light panel with the lowest brightness and the quantum dot film diffuser with the lowest brightness to test 95% of the brightness of the display module when the grayscale value is 255, which is used as the target brightness of the display module.

11. The method for eliminating color difference of a display module according to any one of claims 1 to 3, wherein: The multiple regions include 480×270 block regions, and calculating the color coordinate difference between the chromaticity data corresponding to the multiple regions and the target color coordinate under the multiple grayscale values ​​includes separately calculating the color coordinate difference of each of the block regions under the multiple grayscale values; Calculating the brightness difference between the brightness data corresponding to the plurality of regions at the plurality of grayscale values ​​and the target brightness includes separately calculating the brightness difference of each of the block regions at the plurality of grayscale values.

12. The method for eliminating color difference of a display module according to claim 11, wherein: Each of the block areas corresponds to 1x1 pixels, 2x2 pixels, 4x4 pixels, 8x8 pixels or 16x16 pixels.

13. A method for eliminating color difference of a spliced ​​screen, comprising: A method for eliminating chromatic aberration of a display module according to any one of claims 1 to 12.

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