CN115188346B - Brightness compensation method of display module and display module - Google Patents

Brightness compensation method of display module and display module Download PDF

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Publication number
CN115188346B
CN115188346B CN202210892210.0A CN202210892210A CN115188346B CN 115188346 B CN115188346 B CN 115188346B CN 202210892210 A CN202210892210 A CN 202210892210A CN 115188346 B CN115188346 B CN 115188346B
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area
compensation
brightness
display
compensation value
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CN115188346A (en
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张云
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Suzhou China Star Optoelectronics Technology Co Ltd
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Suzhou China Star Optoelectronics Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention provides a brightness compensation method of a display module and the display module; according to the method, the optimal compensation value can be determined according to the compensation brightness change of each area of the displayed picture under different compensation values of the display module, the optimal compensation value of the dark bands among the COFs corresponding to all COFs can be realized only by four picture collection at most, automatic determination of the compensation value is realized, the manual requirement is reduced, the limit that the dark bands among the COFs cannot be compensated on line is broken through, and the technical problem that the dark bands among the COFs of the existing display module cannot be compensated on line is solved.

Description

Brightness compensation method of display module and display module
Technical Field
The present invention relates to the field of display technologies, and in particular, to a brightness compensation method for a display module and a display module.
Background
The problem of dark bands between multiple COFs (Chip On films) is a problem that plagues TFT-LCD (Thin Film Transistor Liquid Crystal Display ) panels, and is caused by uneven charging rates due to the difference in Fan-out resistance in COFs.
Aiming at the problems, a professional technician is required to manually try to perform display compensation on the corresponding display subareas of each COF, and the mode depends on manual judgment and has low efficiency.
Therefore, improvement is needed to solve the technical problem that the dark bands between COFs of the conventional multi-COF display module cannot be compensated online.
Disclosure of Invention
The invention provides a brightness compensation method of a display module and the display module, which are used for solving the technical problem that dark bands between COFs of the existing display module cannot be compensated on line.
In order to solve the problems, the technical scheme provided by the invention is as follows:
the embodiment of the invention provides a brightness compensation method of a display module, which is applied to the display module, wherein the display module comprises a display panel and a plurality of flip-chip films electrically connected to the display panel, a display area of the display panel comprises a plurality of display subareas, and each flip-chip film drives the corresponding display subarea, and the method comprises the following steps:
s1, identifying a first area of a plurality of display subareas according to pictures of the display panel shot by a camera and acquiring initial compensation values of the first area, wherein the display subareas comprise the first area and a second area, and the initial brightness of the first area is smaller than that of the second area;
s2, performing first compensation on the display area according to a preset maximum compensation value;
s3, acquiring first compensation brightness of the first area and the second area according to the picture of the display panel after the first compensation shot by the camera, and judging whether to carry out subsequent compensation according to a comparison result of the first compensation brightness of the first area and the second area;
wherein S3 includes: s30, when the first compensation brightness of the first area is larger than the first compensation brightness of the second area, performing second compensation on the display area according to a second compensation value related to the maximum compensation value and the initial compensation value;
s4, acquiring second compensation brightness of the first area and the second area according to the picture of the display panel after the second compensation shot by the camera, and carrying out third compensation on the display area by a third compensation value according to a comparison result of the second compensation brightness of the first area and the second area;
s5, obtaining third compensation brightness of the first area and the second area according to the picture of the display panel after the third compensation shot by the camera, and determining a final compensation value according to a comparison result of the third compensation brightness of the first area and the second area and the initial brightness of the first area and the second area.
In the brightness compensation method of the display module provided by the embodiment of the invention, the second compensation value is an average value of the maximum compensation value and the initial compensation value.
In the brightness compensation method of the display module provided by the embodiment of the invention, the S4 includes:
s40, when the second compensation luminance of the first region is smaller than the second compensation luminance of the second region, the third compensation value is related to the second compensation value and the maximum compensation value.
In the brightness compensation method of the display module provided by the embodiment of the invention, the third compensation value is an average value of the second compensation value and the maximum compensation value.
In the brightness compensation method of the display module provided by the embodiment of the invention, the S4 includes:
s41, when the second compensation luminance of the first region is greater than the second compensation luminance of the second region, and luminance waveforms corresponding to the second compensation luminance of the first region and the second region are flatter than those corresponding to the first compensation luminance of the first region and the second region, the third compensation value is correlated with the second compensation value and the initial compensation value.
In the brightness compensation method of the display module provided by the embodiment of the invention, the third compensation value is an average value of the second compensation value and the initial compensation value.
In the brightness compensation method of the display module provided by the embodiment of the invention, the S5 includes:
and S50, when the brightness waveforms corresponding to the third compensation brightness of the first area and the second area are more gentle than the brightness waveforms corresponding to the initial brightness of the first area and the second area, the final compensation value is the third compensation value.
In the brightness compensation method of the display module provided by the embodiment of the invention, the S5 includes:
s51, when the luminance waveform corresponding to the third compensation luminance of the first region and the second region is steeper than the luminance waveform corresponding to the initial luminance of the first region and the second region, the final compensation value is: and compensating values corresponding to the flattest brightness waveforms in the brightness waveforms of the first area and the second area, wherein the initial compensating values, the maximum compensating values, the first compensating values and the second compensating values correspond to the flattest brightness waveforms.
In the brightness compensation method of the display module provided by the embodiment of the invention, the S3 further includes:
and S31, when the first compensation brightness of the first area is smaller than the first compensation brightness of the second area, and brightness waveforms corresponding to the first compensation brightness of the first area and the second area are flatter than brightness waveforms corresponding to the initial brightness of the first area and the second area, the maximum compensation value is taken as a final compensation value.
Further, the embodiment of the invention also provides a display module, which comprises a display panel and a plurality of flip chip films electrically connected to the display panel, wherein a display area of the display panel comprises a plurality of display subareas, and each flip chip film drives the corresponding display subarea; the flip chip film stores the final compensation value obtained by the method described above.
The beneficial effects of the invention are as follows: the invention provides a brightness compensation method of a display module and the display module; the brightness compensation method of the display module is applied to the display module, the display module comprises a display panel and a plurality of flip chip films electrically connected to the display panel, a display area of the display panel comprises a plurality of display subareas, and each flip chip film drives the corresponding display subarea, and the method comprises the following steps: s1, identifying a first area of a plurality of display subareas according to pictures of the display panel shot by a camera and acquiring initial compensation values of the first area, wherein the display subareas comprise the first area and a second area, and the initial brightness of the first area is smaller than that of the second area; s2, performing first compensation on the display area according to a preset maximum compensation value; s3, acquiring first compensation brightness of the first area and the second area according to the picture of the display panel after the first compensation shot by the camera, and judging whether to carry out subsequent compensation according to a comparison result of the first compensation brightness of the first area and the second area; wherein S3 includes: s30, when the first compensation brightness of the first area is larger than the first compensation brightness of the second area, performing second compensation on the display area according to a second compensation value related to the maximum compensation value and the initial compensation value; s4, acquiring second compensation brightness of the first area and the second area according to the picture of the display panel after the second compensation shot by the camera, and carrying out third compensation on the display area by a third compensation value according to a comparison result of the second compensation brightness of the first area and the second area; s5, obtaining third compensation brightness of the first area and the second area according to the picture of the display panel after the third compensation shot by the camera, and determining a final compensation value according to a comparison result of the third compensation brightness of the first area and the second area and the initial brightness of the first area and the second area. The embodiment of the invention provides a method for compensating the inter-COF dark bands of a multi-COF display module, which can determine an optimal compensation value according to the compensation brightness change of each area of a displayed picture of the display module under different compensation values, and can realize the optimal compensation value of the inter-COF dark bands corresponding to all COFs only by four picture collection at most, thereby realizing automatic determination of the compensation value, reducing the requirement on manpower, breaking through the limitation that the inter-COF dark bands cannot be compensated on line, and relieving the technical problem that the inter-COF dark bands of the existing display module cannot be compensated on line.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1a and fig. 1b are schematic structural diagrams of a display module according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a brightness compensation method according to an embodiment of the invention;
FIG. 3 is a schematic flow chart of a brightness compensation method according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a brightness compensation method according to an embodiment of the present invention;
fig. 5 to 8 are schematic image diagrams according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In this application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Aiming at the technical problem that the dark bands between COFs of the existing multi-COF display module cannot be compensated on line, the embodiment of the invention can be relieved.
An exemplary display module related to the present application will now be described with reference to fig. 1a and 1 b.
As shown in fig. 1a, the display module according to the present application includes a display panel 10 and a plurality of flip-chip films 20 electrically connected to the display panel 10, the display area AA of the display panel 10 includes a plurality of display sub-areas S, and each of the flip-chip films 20 drives the corresponding display sub-area S (fig. 6 shows that the display area includes 6 display sub-areas S).
As shown in fig. 1b, the Fan-out (Fan-out area) of each display sub-area S has a resistance difference between the signal lines, so that the charging rates of the sub-pixels in different columns are not uniform, and a dark band as shown in fig. 5 may appear: when one display sub-area S is written with the same gray scale voltage, a part of the area is bright (the area corresponds to the signal line with smaller resistance in the fan-out area, i.e. the second area S2 hereinafter), and the other area is dark (the area corresponds to the signal line with larger resistance in the fan-out area, i.e. the first area S1 hereinafter), and these dark bands need to be compensated to make the picture displayed by the display panel 10 as uniform as possible.
In order to solve the above-mentioned problems, the present application provides a brightness compensation method of a display module, specifically, the brightness compensation method of a display module provided by the present application is applied to a display module shown in fig. 1a, and as shown in fig. 2, the method includes the following steps:
s1, identifying a first area of a plurality of display subareas according to pictures of the display panel shot by a camera, and acquiring initial compensation values of the first area, wherein the display subareas comprise the first area and a second area, and the initial brightness of the first area is smaller than that of the second area.
In one embodiment, at time t1, the display module works with an initial compensation value to display a solid-color picture under a certain gray level, and the camera is used to shoot the picture displayed by the display panel, as shown in fig. 5, a dark band appears at this time, in fig. 5, different gray levels represent different brightnesses, a gray level of a certain region represents that the brightness of the corresponding region is high, and conversely, a gray level of a certain region represents that the brightness of the corresponding region is low. At this time, the plurality of display sub-areas S in fig. 6 corresponding to fig. 5 are divided into a first area S1 and a second area S2 according to the difference of the initial brightness, wherein the initial brightness of the first area is smaller than that of the second area.
Since the brightness is difficult to intuitively reflect the difference, other embodiments of the present application quantize the difference (convert the actual brightness value and the maximum brightness value to obtain gray-scale brightness, where the gray-scale brightness is any value between 0 and 255, or between 0 and 127, or between 0 and 511), to obtain a gray-scale-position change curve w shown in fig. 6, from the curve w, it can be intuitively seen that the brightness of the picture displayed by the display panel changes with the position (horizontal axis), and the brightness of the picture changes periodically and darkly, and the change curve of each display sub-area is also different.
S2, performing first compensation on the display area according to a preset maximum compensation value.
S3, acquiring first compensation brightness of the first area and the second area according to the picture of the display panel after the first compensation shot by the camera, and judging whether to carry out subsequent compensation according to a comparison result of the first compensation brightness of the first area and the second area.
In one embodiment, at time t2, each COF in the display module works with the maximum compensation value corresponding to the display sub-area, the solid-color picture is displayed, the picture displayed on the display panel is shot by using the camera, the first compensation brightness (the gray-scale brightness and other brightness values of each first area and each second area after the first compensation) of each first area and each second area is obtained, and then whether the subsequent compensation is performed is determined according to the comparison result of the first compensation brightness of each first area and each second area.
Wherein S3 includes: s30, when the first compensation brightness of the first area is larger than the first compensation brightness of the second area, performing second compensation on the display area according to a second compensation value related to the maximum compensation value and the initial compensation value; or, S31, when the first compensation luminance of the first region is smaller than the first compensation luminance of the second region, and a luminance waveform corresponding to the first compensation luminance of the first region and the second region is more gentle than a luminance waveform corresponding to the initial luminance of the first region and the second region, the maximum compensation value is taken as a final compensation value.
In one embodiment, the second compensation value is an average of the maximum compensation value and the initial compensation value. The embodiment can ensure better compensation effect while reducing the calculated amount.
In one embodiment, fig. 6 is taken in, and the picture acquired in step S2 (the picture at the time of t 2) is quantized to obtain a variation curve of the first compensation luminance root position, and the variation curve is compared with the curve shown in fig. 6 to obtain a comparison curve shown in fig. 7.
As shown in fig. 7, the curves of the first compensation luminance may appear as 3 curves shown in fig. 7: curve a, curve b, curve c; for a scene in which the display subarea of the curve a or the curve b appears, the first compensation brightness conforming to the first area is smaller than the first compensation brightness of the second area, and brightness waveforms corresponding to the first compensation brightness of the first area and the second area are more gentle than brightness waveforms corresponding to the initial brightness of the first area and the second area, directly executing step S31, and taking the maximum compensation value as a final compensation value; for the display subarea where the curve c appears, the step S30 is directly executed to conform to the scene that the first compensation brightness of the first area is greater than the first compensation brightness of the second area, and the display area is compensated for the second time according to the second compensation value related to the maximum compensation value and the initial compensation value.
S4, obtaining second compensation brightness of the first area and the second area according to the picture of the display panel after the second compensation shot by the camera, and carrying out third compensation on the display area by a third compensation value according to a comparison result of the second compensation brightness of the first area and the second area.
Wherein S4 includes: s40, when the second compensation luminance of the first region is less than the second compensation luminance of the second region, the third compensation value is related to the second compensation value and the maximum compensation value; or, S41, when the second compensation luminance of the first region is greater than the second compensation luminance of the second region, and luminance waveforms corresponding to the second compensation luminance of the first region and the second region are flatter than those corresponding to the first compensation luminance of the first region and the second region, the third compensation value is related to the second compensation value and the initial compensation value.
In one embodiment, in the scene corresponding to S40, the third compensation value is an average value of the second compensation value and the maximum compensation value; in the scenario corresponding to S41, the third compensation value is an average value of the second compensation value and the initial compensation value. Similarly, the embodiment can ensure a better compensation effect while reducing the calculation amount.
In one embodiment, at time t3, each COF in the display module works with a second compensation value corresponding to the display sub-area, the solid-color picture is displayed, the picture displayed on the display panel is shot by using the camera, and the second compensation brightness (the gray-scale brightness and the like of each first area and each second area after the second compensation) of each first area and each second area is obtained, and then the step is executed.
In one embodiment, fig. 7 is taken over, and the picture acquired in step S4 (the picture at the time t 3) is quantized to obtain a variation curve of the second compensation luminance root position, and the variation curve is compared with the curve shown in fig. 7 to obtain a comparison curve shown in fig. 8.
As shown in fig. 8, the second compensated luminance profile will appear from the 2 profiles shown in fig. 8: curve d and curve e; for the display subarea where the curve d appears, directly executing step S40, wherein the third compensation value is related to the second compensation value and the maximum compensation value, and performing third compensation on the display area by using the third compensation value, wherein the third compensation value corresponds to a scene that the second compensation brightness of the first area is smaller than the second compensation brightness of the second area; for the display subarea where the curve e appears, the second compensation brightness corresponding to the first area is greater than the second compensation brightness of the second area, and the brightness waveforms corresponding to the second compensation brightness of the first area and the second area are more gentle relative to the brightness waveforms corresponding to the first compensation brightness of the first area and the second area, step S41 is directly executed, and at this time, the third compensation value is related to the second compensation value and the initial compensation value, and the third compensation value is used for carrying out the third compensation according to the display area.
S5, obtaining third compensation brightness of the first area and the second area according to the picture of the display panel after the third compensation shot by the camera, and determining a final compensation value according to a comparison result of the third compensation brightness of the first area and the second area and the initial brightness of the first area and the second area.
Wherein S5 includes: s50, when the brightness waveforms corresponding to the third compensation brightness of the first area and the second area are more gentle than the brightness waveforms corresponding to the initial brightness of the first area and the second area, the final compensation value is the third compensation value; or, S51, when the luminance waveform corresponding to the third compensation luminance of the first region and the second region is steeper than the luminance waveform corresponding to the initial luminance of the first region and the second region, the final compensation value is: and the initial value, the maximum compensation value, and the compensation value corresponding to the flattest brightness waveform in the brightness waveforms of the first area and the second area corresponding to the first compensation value and the second compensation value.
In one embodiment, at time t4, each COF in the display module works with a third compensation value corresponding to the display sub-area, the solid-color picture is displayed, the picture displayed on the display panel is shot by using the camera, and the third compensation brightness (the gray-scale brightness and the like of each first area and each second area after the third compensation) of each first area and each second area is obtained, and then the step is executed.
In one embodiment, fig. 8 is taken, and the image collected in step S5 (the image at time t 4) is quantized to obtain a third compensation brightness and position variation curve (which is similar to the other curves described above, so that no schematic diagram is given, and reference may be made to the curves in the other drawings), and this is compared with the curves shown in fig. 8.
If the comparison result shows that: a luminance waveform corresponding to the third compensation luminance of the first region and the second region is gentler than a luminance waveform corresponding to the initial luminance of the first region and the second region, and at this time, step S50 is performed to determine the final compensation value as the third compensation value; alternatively, the luminance waveform corresponding to the third compensation luminance representing the first region and the second region is steeper than the luminance waveform corresponding to the initial luminance of the first region and the second region, and at this time, step S51 is performed, where the final compensation value is: the initial compensation value, the maximum compensation value, the first compensation value and the second compensation value correspond to the compensation value corresponding to the flattest brightness waveform in the brightness waveforms of the first area and the second area, and the result can be determined according to the visual comparison of curves in the several drawings.
In summary, the embodiment of the application provides a method for compensating the inter-COF dark bands of a multi-COF display module, which can determine an optimal compensation value according to the compensation brightness change of each area of a displayed picture of the display module under different compensation values, and can realize the optimal compensation value of the inter-COF dark bands corresponding to all COFs only by four picture collection at most, thereby realizing automatic determination of the compensation value, reducing the need of manpower, breaking through the limitation that the inter-COF dark bands cannot be compensated online, and relieving the technical problem that the inter-COF dark bands of the existing display module cannot be compensated online.
The embodiment shown in fig. 2 is described with the first and second regions of the display sub-regions as separate compensation regions, and now with the scenario in which the display sub-regions are compensated as a compensation whole.
As shown in fig. 3, in this scenario, the method is used for managing and burning compensation parameters of the display device; the display device comprises a display panel and at least two circuit boards electrically connected to the display panel, wherein the circuit boards are provided with driving chips, the display panel comprises at least two display areas, and the display areas correspond to the driving chips; the management method comprises the steps of managing and burning compensation parameters of the display device; the display device comprises a display panel and at least two circuit boards electrically connected to the display panel, wherein the circuit boards are provided with driving chips, the display panel comprises at least two display areas, and the display areas correspond to the driving chips; the method comprises the following steps:
s301, controlling each driving chip in the display device to display a detection pattern at a first moment based on an initial gray level compensation value of a corresponding display area.
S302, acquiring display contents of the display device at the first moment through a camera to obtain a first pattern, namely a picture shown in fig. 5, and carrying out quantization processing on the first pattern to obtain a first quantization pattern, namely a picture shown in fig. 6.
S303, controlling each driving chip in the display device to display the detection pattern at a second moment based on the maximum gray level compensation value of the corresponding display area.
S304, acquiring display contents of the display device at the second moment through the camera to obtain a second pattern, and carrying out quantization processing on the second pattern to obtain a second quantized pattern.
S305, determining the actual compensation value of each display area according to the comparison result of the first quantization pattern and the second quantization pattern.
S306, burning the actual compensation value of each display area to the corresponding driving chip of each display area.
In one embodiment, determining the actual compensation value of each display area according to the comparison result of the first quantization pattern and the second quantization pattern includes:
comparing the first gray level position curve (schematic diagram shown in fig. 6) of each display area in the first quantization pattern with the second gray level position curve (schematic diagram shown in fig. 7) of each display area in the second quantization pattern to obtain the relative position of the first curve of each display area;
determining a display area (namely, an area corresponding to a curve a and a curve b in fig. 7) of which the relative position of the first curve represents that the gray level position curve is not inverted as a first display area, and determining other display areas as a second display area (namely, an area corresponding to a curve c in fig. 7);
and determining the maximum gray-scale compensation value of each first display area as the actual compensation value of each first display area.
In one embodiment, the steps of the previous embodiment further comprise:
controlling a driving chip corresponding to each second display area in the display device to display the detection pattern at a third moment based on the first gray-scale compensation value of the corresponding display area; the first gray scale compensation value is determined according to the initial gray scale compensation value and the maximum gray scale compensation value;
acquiring display content of the display device at the third moment through the camera to obtain a third pattern, and carrying out quantization processing on the third pattern to obtain a third quantized pattern;
according to the comparison results of the first quantization pattern, the second quantization pattern and the third quantization pattern, a schematic diagram shown in fig. 8 is obtained, and a third display area and a fourth display area in each second display area are determined;
controlling the driving chips corresponding to the third display areas in the display device to display the detection patterns at a fourth time based on the second gray-scale compensation values of the corresponding display areas, and controlling the driving chips corresponding to the fourth display areas in the display device to display the detection patterns at a fourth time based on the third gray-scale compensation values of the corresponding display areas;
acquiring display content of the display device at the fourth moment through the camera to obtain a fourth pattern, and carrying out quantization processing on the fourth pattern to obtain a fourth quantized pattern;
and determining the actual compensation value of each second display area according to the comparison result of the first quantization pattern and the fourth quantization pattern.
In one embodiment, determining the third display area and the fourth display area in each of the second display areas according to the comparison result of the first quantization pattern, the second quantization pattern and the third quantization pattern includes:
comparing the first gray level position curve of each second display area in the first quantization pattern, the second gray level position curve of each second display area in the second quantization pattern and the third gray level position curve of each second display area in the third quantization pattern to obtain the relative position of the second curve of each second display area;
the second display area where the second curve relative position represents the third gray-scale position curve is close to the first gray-scale position curve (curve w) is determined as a third display area (an area corresponding to curve d in fig. 8), and the other second display areas are determined as fourth display areas (an area corresponding to curve e in fig. 8).
In one embodiment, the second gray scale compensation value is determined according to the first gray scale compensation value and the maximum gray scale compensation value, and the third gray scale compensation value is determined according to the first gray scale compensation value and the initial gray scale compensation value.
In one embodiment, determining the actual compensation value of each of the second display areas according to the comparison result of the first quantization pattern and the fourth quantization pattern includes:
comparing the waveform gentle parameters of the first gray level position curves of the second display areas in the first quantization patterns with the waveform gentle parameters of the fourth gray level position curves of the second display areas in the fourth quantization patterns to obtain waveform gentle comparison results; the waveform flattening parameters include flatness and the like;
determining the second display area, of which the waveform gentle comparison result represents that the fourth gray level position curve is flatter than the first gray level position curve, as a fifth display area, and determining the other second display areas as sixth display areas;
and determining the second gray-scale compensation value or the third gray-scale compensation value of each fifth display area at the fourth moment as an actual compensation value of each fifth display area.
In one embodiment, the steps of the previous embodiment further comprise:
determining a target quantization pattern with the most gentle waveform flattening parameters corresponding to each sixth display area from the first quantization pattern, the second quantization pattern, the third quantization pattern and the fourth quantization pattern according to the waveform flattening parameters of the first gray level position curve of each sixth display area in the first quantization pattern, the waveform flattening parameters of the second gray level position curve of each sixth display area in the second quantization pattern, the waveform flattening parameters of the third gray level position curve of each sixth display area in the third quantization pattern and the waveform flattening parameters of the fourth gray level position curve of each sixth display area in the fourth quantization pattern;
and determining the gray-scale compensation value corresponding to the target quantization pattern of each sixth display area as the actual compensation value of each sixth display area.
In one embodiment, the detection pattern comprises a plurality of patterns of different gray levels and/or different single colors including at least one of red, blue and green. The embodiment can complete the correction of the multi-gray scale interval of the multi-color sub-pixel.
In an embodiment, the present application further provides a management system for compensating parameters of a display device, which is configured to manage and record the compensating parameters of the display device; the display device comprises a display panel and at least two circuit boards electrically connected to the display panel, wherein the circuit boards are provided with driving chips, the display panel comprises at least two display areas, and the display areas correspond to the driving chips; the management system comprises a host and a camera, wherein the host comprises a control module, a processing module and a burning module, and the host comprises a computer, a camera and a camera, wherein the host comprises a camera, a camera and a camera, wherein the camera comprises a camera, a camera and a camera module, and the camera comprises a camera module, a camera module and a camera module, wherein the camera module comprises a camera module, a camera module and a camera module, and a:
the control module is used for controlling each driving chip in the display device to display detection patterns at a first moment based on initial gray-scale compensation values of corresponding display areas;
the processing module is used for acquiring the display content of the display device at the first moment to obtain a first pattern, and carrying out quantization processing on the first image to obtain a first quantized pattern;
the control module is also used for controlling each driving chip in the display device to display the detection pattern at a second moment based on the maximum gray level compensation value of the corresponding display area;
the processing module is also used for acquiring the display content of the display device at the second moment to obtain a second pattern, and carrying out quantization processing on the second image to obtain a second quantization pattern;
the processing module is further used for determining an actual compensation value of each display area according to the comparison result of the first quantization pattern and the second quantization pattern;
the burning module is used for burning the actual compensation value of each display area to the driving chip corresponding to each display area.
In an embodiment, the application further provides a display device, which includes a display panel and at least two circuit boards electrically connected to the display panel, the circuit boards are provided with a driving chip, the display panel includes at least two display areas, the display areas correspond to the driving chip, the driving chip stores an actual compensation value for compensating for a dark band between the circuit boards, and the actual compensation value is obtained by the method.
In one embodiment, the application further provides a display module, the display module includes a display panel and a plurality of flip chip films electrically connected to the display panel, a display area of the display panel includes a plurality of display sub-areas, and each of the flip chip films drives the corresponding display sub-area; the flip chip film stores the final compensation value obtained by the method described above.
The present application will be further described with reference to a scenario, as shown in fig. 4, in which the compensation method provided in the present application includes the following steps:
step1: the camera is used to take a heavy duty picture and identify the inter-COF dark band region as follows. And quantizing according to the picture result.
In this embodiment, each COF region has an initial compensation value, calculated as
After this step is performed, the initial picture shown in fig. 5 is obtained, and after quantization, the change curve shown in fig. 6 is obtained.
Step2: first compensation, writing upper limit value of corresponding area into control chip (Tcon) of COF, which is calculated asAnd shooting a heavy-duty picture by using a camera, identifying the dark band area between COFs, and quantifying according to a picture result.
After this step is performed, a change curve shown in fig. 7 is obtained. In fig. 7, curves a and b appear, indicating that this region has not been optimized further,namely the compensation value of the area; when curve c occurs, step3 compensation is required.
Step3: the second compensation, write the average value of the initial value and the upper limit value of the corresponding area into the Tcon, is calculated asPhotographing and quantifying data.
After this step is performed, the curves shown in fig. 8 are obtained, that is, only the curve d and the curve e appear after the second compensation, when the curve d appears, setp5 is performed, and when the curve e appears, shep4 is performed.
Step4: third compensation, writing initial value sum of corresponding region into TconMean of (1)
Step5: third time compensationWriting corresponding region into TconThe mean value of the value and the upper limit value (maximum compensation value) is +.>
Step6: the camera takes a picture, performs data quantization, and compares the data with the initial data.
The step is mainly to compare the initial waveform with the improved waveform, if the improved waveform is gentle, the optimal result in the compensation period is called as a parameter (namely, the actual compensation value) if the waveform is not gentle, and if the waveform is gentle, the numerical value used in the third compensation is used as the parameter.
As can be seen from the above embodiments:
the invention provides a brightness compensation method of a display module and the display module; the brightness compensation method of the display module is applied to the display module, the display module comprises a display panel and a plurality of flip chip films electrically connected to the display panel, a display area of the display panel comprises a plurality of display subareas, and each flip chip film drives the corresponding display subarea, and the method comprises the following steps: s1, identifying a first area of a plurality of display subareas according to pictures of the display panel shot by a camera and acquiring initial compensation values of the first area, wherein the display subareas comprise the first area and a second area, and the initial brightness of the first area is smaller than that of the second area; s2, performing first compensation on the display area according to a preset maximum compensation value; s3, acquiring first compensation brightness of the first area and the second area according to the picture of the display panel after the first compensation shot by the camera, and judging whether to carry out subsequent compensation according to a comparison result of the first compensation brightness of the first area and the second area; wherein S3 includes: s30, when the first compensation brightness of the first area is larger than the first compensation brightness of the second area, performing second compensation on the display area according to a second compensation value related to the maximum compensation value and the initial compensation value; s4, acquiring second compensation brightness of the first area and the second area according to the picture of the display panel after the second compensation shot by the camera, and carrying out third compensation on the display area by a third compensation value according to a comparison result of the second compensation brightness of the first area and the second area; s5, obtaining third compensation brightness of the first area and the second area according to the picture of the display panel after the third compensation shot by the camera, and determining a final compensation value according to a comparison result of the third compensation brightness of the first area and the second area and the initial brightness of the first area and the second area. The embodiment of the invention provides a method for compensating the inter-COF dark bands of a multi-COF display module, which can determine an optimal compensation value according to the compensation brightness change of each area of a displayed picture of the display module under different compensation values, and can realize the optimal compensation value of the inter-COF dark bands corresponding to all COFs only by four picture collection at most, thereby realizing automatic determination of the compensation value, reducing the requirement on manpower, breaking through the limitation that the inter-COF dark bands cannot be compensated on line, and relieving the technical problem that the inter-COF dark bands of the existing display module cannot be compensated on line.
In summary, although the present invention has been described in terms of the preferred embodiments, the preferred embodiments are not limited to the above embodiments, and various modifications and changes can be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention is defined by the appended claims.

Claims (8)

1. The utility model provides a luminance compensation method of display module assembly, is applied to the display module assembly, the display module assembly includes display panel and electric connection in a plurality of flip chip films of display panel, the display area of display panel includes a plurality of display subregions, every flip chip film drive corresponding display subregion, the method includes:
s1, identifying a first area of a plurality of display subareas according to pictures of the display panel shot by a camera and acquiring initial compensation values of the first area, wherein the display subareas comprise the first area and a second area, and the initial brightness of the first area is smaller than that of the second area;
s2, performing first compensation on the display area according to a preset maximum compensation value;
s3, acquiring first compensation brightness of the first area and the second area according to the picture of the display panel after the first compensation shot by the camera, and judging whether to carry out subsequent compensation according to a comparison result of the first compensation brightness of the first area and the second area;
wherein S3 includes: s30, when the first compensation brightness of the first area is larger than the first compensation brightness of the second area, performing second compensation on the display area according to a second compensation value related to the maximum compensation value and the initial compensation value;
s4, acquiring second compensation brightness of the first area and the second area according to the picture of the display panel after the second compensation shot by the camera, and carrying out third compensation on the display area by a third compensation value according to a comparison result of the second compensation brightness of the first area and the second area;
s5, obtaining third compensation brightness of the first area and the second area according to the picture of the display panel after the third compensation shot by the camera, and determining a final compensation value according to a comparison result of the third compensation brightness of the first area and the second area and the initial brightness of the first area and the second area;
wherein S5 includes:
s50, when the brightness waveforms corresponding to the third compensation brightness of the first area and the second area are more gentle than the brightness waveforms corresponding to the initial brightness of the first area and the second area, the final compensation value is the third compensation value;
or, S51, when the luminance waveform corresponding to the third compensation luminance of the first region and the second region is steeper than the luminance waveform corresponding to the initial luminance of the first region and the second region, the final compensation value is: and compensating values corresponding to the flattest brightness waveforms in the brightness waveforms of the first area and the second area, wherein the initial compensating values, the maximum compensating values, the second compensating values and the third compensating values correspond to the flattest brightness waveforms.
2. The method of claim 1, wherein the second compensation value is an average of the maximum compensation value and the initial compensation value.
3. The method according to claim 1, wherein S4 comprises:
s40, when the second compensation luminance of the first region is smaller than the second compensation luminance of the second region, the third compensation value is related to the second compensation value and the maximum compensation value.
4. A method according to claim 3, wherein the third compensation value is an average of the second compensation value and the maximum compensation value.
5. The method according to claim 1, wherein S4 comprises:
s41, when the second compensation luminance of the first region is greater than the second compensation luminance of the second region, and luminance waveforms corresponding to the second compensation luminance of the first region and the second region are flatter than those corresponding to the first compensation luminance of the first region and the second region, the third compensation value is correlated with the second compensation value and the initial compensation value.
6. The method of claim 5, wherein the third compensation value is an average of the second compensation value and the initial compensation value.
7. The method of claim 1, wherein S3 further comprises:
and S31, when the first compensation brightness of the first area is smaller than the first compensation brightness of the second area, and brightness waveforms corresponding to the first compensation brightness of the first area and the second area are flatter than brightness waveforms corresponding to the initial brightness of the first area and the second area, the maximum compensation value is taken as a final compensation value.
8. The display module is characterized by comprising a display panel and a plurality of flip chip films electrically connected to the display panel, wherein a display area of the display panel comprises a plurality of display subareas, and each flip chip film drives the corresponding display subarea; the flip chip film stores a final compensation value obtained by the method according to any one of claims 1 to 7.
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