CN117116201A - Display screen uniformity calibration method, calibration device and display device - Google Patents
Display screen uniformity calibration method, calibration device and display device Download PDFInfo
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
Abstract
The disclosure provides a calibration method, a calibration device and a display device for uniformity of a display screen, wherein the method is applied to a closed-loop structure and comprises the following steps: performing conversion processing on a preset single gray-scale image to generate a correction image, and driving a display screen to display the correction image; photographing the corrected image displayed by the display screen to obtain a picture meeting the preset exposure requirement; extracting the brightness of each lamp bead in the picture through a closed-loop structure, and identifying the average value of the brightness of all the lamp beads in the picture; and generating compensation data of the uniformity of the display screen based on the average value of the brightness of all the lamp beads in the picture and the brightness of each lamp bead, and compensating a preset single gray scale picture by using the compensation data. The method and the device generate the compensation data of the uniformity of the display screen, and achieve calibration of the compensation data of the uniformity of the display screen of the preset single gray level diagram; and the single gray scale image is compensated by the compensation data of the uniformity of the display screen, so that the problem that the display screen can not uniformly display images in the related technology is solved.
Description
Technical Field
The disclosure relates to the technical field of display screens, and in particular relates to a calibration method, a calibration device and a display device for uniformity of a display screen.
Background
Because of the reasons of semiconductor materials and processes, the display screen manufactured at present has the phenomenon of uneven screen display, the display screen cannot uniformly display pictures, and the display screens with different materials and different brightness can show uneven screen display with different degrees.
Aiming at the problem that the display screen in the related art can not uniformly display pictures, no effective technical solution is proposed at present.
Disclosure of Invention
The main purpose of the present disclosure is to provide a calibration method, calibration device and display device for uniformity of a display screen, so as to solve the problem that the display screen in the related art cannot uniformly display images.
In order to achieve the above object, a first aspect of the present disclosure provides a method for calibrating uniformity of a display screen, applied to a closed-loop structure, the method comprising:
s1: performing conversion processing on a preset single gray-scale image to generate a correction image, and driving a display screen to display the correction image;
s2: photographing the corrected image displayed by the display screen to obtain a picture meeting the preset exposure requirement;
s3: extracting the brightness of each lamp bead in the picture through a closed-loop structure, and identifying the average value of the brightness of all the lamp beads in the picture; and
s4: and generating compensation data of the uniformity of the display screen based on the average value of the brightness of all the lamp beads in the picture and the brightness of each lamp bead, and compensating a preset single gray scale picture by using the compensation data.
Optionally, after compensating the preset single gray-scale map with the compensation data, the method further includes:
step S1 to step S3 are executed again on the compensated single gray scale image to obtain the average value of the brightness of all the lamp beads and the brightness of each lamp bead in the compensated image which accords with the preset exposure requirement;
judging whether the difference value between the average value of the brightness of all the lamp beads in the compensation picture and the brightness of each lamp bead is within a preset range or not;
if the compensation data are within the preset range, obtaining optimal compensation data;
if the non-uniformity is within the preset range, repeating the step S4 and the step S1 to the step S3 based on the average value of the brightness of all the lamp beads in the compensation picture and the brightness of each lamp bead until the difference value is within the preset range, and obtaining the optimal compensation data.
Further, after obtaining the optimal compensation data, the method further comprises:
repeatedly executing the steps S1 to S4 on the single gray level graph with different gray levels from the preset single gray level graph until the optimal compensation data of the uniformity of the display screen under different gray levels is obtained;
the gray scale data of the preset single gray scale map corresponds to a preset range, the preset range is a unit value of compensation gray scale data, and optimal compensation data of uniformity of the display screen under different gray scales are different.
Optionally, performing transformation processing on a preset single gray-scale image to generate a corrected image, and driving a display screen to display the corrected image, including:
gamma conversion is carried out on the preset single gray level image, and the contrast of the preset single gray level image is adjusted to obtain a corrected image;
and driving a display screen to display the correction image through a lower computer, wherein the display screen is a Micro-LED display module.
Optionally, before photographing the corrected image displayed on the display screen, the method further includes:
and dynamically adjusting a shutter of the camera to enable the picture obtained by photographing after adjustment to meet the preset exposure requirement.
Optionally, extracting the brightness of each bead in the picture through the closed loop structure, and identifying the average value of the brightness of all the beads in the picture includes:
extracting the brightness of each lamp bead in the picture through an upper computer in a closed-loop structure, and generating a lamp bead brightness image;
carrying out display uniformity identification on the lamp bead brightness image to obtain a display gray-scale image;
and determining the average value of the brightness of all the lamp beads in the displayed gray-scale image.
Further, based on the average value of the brightness of all the lamp beads in the picture and the brightness of each lamp bead, generating compensation data of the uniformity of the display screen comprises:
determining a difference between the brightness and the average value of each lamp bead;
and generating compensation data of the uniformity of the display screen based on the magnitude relation between the difference value and the unit value of the compensation gray-scale data.
The second aspect of the disclosure provides a calibration device for uniformity of a display screen, the device adopts a closed-loop structure, the closed-loop structure comprises an upper computer, a lower computer, the display screen and a camera which are sequentially connected, and the camera is connected with the upper computer;
the upper computer is used for storing a plurality of single gray-scale images with different gray scales, selecting one Shan Huijie image from the single gray-scale images with different gray scales as a preset single gray-scale image, extracting the brightness of each lamp bead in the image fed back by the camera, identifying the average value of the brightness of all the lamp beads in the image, and generating compensation data of the uniformity of the display screen;
the lower computer is used for receiving the preset single-gray-scale image and the compensation data sent by the upper computer, compensating the preset single-gray-scale image by using the compensation data, performing conversion processing on the preset single-gray-scale image or the compensated single-gray-scale image, generating a correction image or a compensation correction image, and driving the display screen to display the correction image or the compensation correction image;
the camera is used for photographing the corrected image or the compensation corrected image displayed by the display screen, obtaining a picture or a compensation picture which meets the preset exposure requirement, and feeding back the picture or the compensation picture to the upper computer.
Optionally, the upper computer is further configured to:
extracting the brightness of each lamp bead in the compensation picture fed back by the camera, and identifying the average value of the brightness of all the lamp beads in the compensation picture;
judging whether the difference value between the average value of the brightness of all the lamp beads in the compensation picture and the average value of the brightness of each lamp bead and the brightness of all the lamp beads is within a preset range or not;
if the compensation data are within the preset range, obtaining optimal compensation data;
if the non-uniformity is within the preset range, the compensation data of the uniformity of the display screen are generated again based on the average value of the brightness of all the lamp beads in the compensation picture and the brightness of each lamp bead.
Further, the gray-scale data of the preset single gray-scale image corresponds to a preset range, the preset range is a unit value of compensation gray-scale data, and the optimal compensation data of the uniformity of the display screen under different gray scales are different.
Optionally, the display screen is a Micro-LED display module.
A third aspect of the present disclosure provides a display device including the calibration device for display screen uniformity provided in any one of the second aspects.
The calibration method for the uniformity of the display screen provided by the embodiment of the disclosure is applied to a closed-loop structure, the brightness of each lamp bead in the picture is extracted through the closed-loop structure, the average value of the brightness of all the lamp beads in the picture is identified, and the brightness of the lamp beads in the picture can be immediately extracted after the picture displayed by the display screen is shot by using the closed-loop structure, so that the display effect is fed back in real time;
based on the average value of the brightness of all the lamp beads in the picture and the brightness of each lamp bead, generating compensation data of the uniformity of the display screen, and calibrating the compensation data of the uniformity of the display screen of a preset single gray scale map; the compensation data is utilized to compensate the preset single gray scale image, the single gray scale image is compensated through the compensation data of the uniformity of the display screen, and the picture can be uniformly displayed on the display screen after compensation, so that the accuracy of the generated compensation data is reflected, the calibration effect of the compensation data is verified, and the calibration problem is solved; in addition, the uniformity of the display screen is compensated, so that the technical effect that the display screen uniformly displays pictures is realized, and the problem that the display screen cannot uniformly display pictures in the related art is solved.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the prior art, the drawings that are required in the detailed description or the prior art will be briefly described, it will be apparent that the drawings in the following description are only some embodiments of the present disclosure and that other drawings may be obtained from these drawings without inventive effort to those of ordinary skill in the art.
FIG. 1 is a flow chart of a method for calibrating uniformity of a display screen according to an embodiment of the disclosure;
fig. 2 is a schematic diagram of a calibration device for display screen uniformity according to an embodiment of the present disclosure.
Detailed Description
In order that those skilled in the art will better understand the present disclosure, a technical solution in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure, shall fall within the scope of the present disclosure.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present disclosure are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
In this disclosure, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.
It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Because of the reasons of semiconductor materials and processes, the display screen manufactured at present has the phenomenon of uneven screen display, the display screen cannot uniformly display pictures, the display screens with different materials and different brightness can show uneven screen display with different degrees, the pictures have different performances on different brightness, and the performances on the display screens with different materials are inconsistent. In this way, accurate uniformity compensation data of the display screen needs to be generated, so that a good compensation effect is obtained, and the display screen can uniformly display the picture when the picture is displayed.
The embodiment of the disclosure provides a method for calibrating uniformity of a display screen, which is applied to a closed-loop structure, wherein the closed-loop structure can comprise a plurality of devices, each device is sequentially connected to form a closed loop, for example, the closed-loop structure can comprise an upper computer, a lower computer, the display screen and a camera which are sequentially connected, and the camera is connected with the upper computer, as shown in fig. 1, the method comprises the following steps S1 to S4:
step S1: performing conversion processing on a preset single gray-scale image to generate a correction image, and driving a display screen to display the correction image; the preset single-gray-scale image is a single-gray-scale image of preset specific gray-scale data, and in order to adapt to a development environment, the preset single-gray-scale image can be subjected to transformation processing according to the same processing sequence as that of the chip; the display screen can be an LED display module, such as a Mini-LED display module and a Micro-LED display module. In implementation, each lamp bead in the Micro-LED display module is a pixel point or a single point.
In an alternative embodiment of the present disclosure, step S1 includes:
gamma conversion is carried out on the preset single gray level image, and the contrast of the preset single gray level image is adjusted to obtain a corrected image; gamma (gamma) conversion is carried out on a preset single gray level diagram, gamma which is adapted to a development environment is applied, so that a corrected image of the display screen displays the gamma characteristic of the standard, wherein the gamma is a parameter for representing the brightness response characteristic of the display screen;
and driving a display screen to display the correction image through a lower computer, wherein the display screen is a Micro-LED display module. Wherein, the lower computer can be an FPGA or a CPU.
Step S2: photographing the corrected image displayed by the display screen to obtain a picture meeting the preset exposure requirement; in order to obtain a high-resolution picture, a camera may be used to take a picture of a suitable exposure value.
In an alternative embodiment of the present disclosure, before step S2, the method further includes:
and adjusting a shutter of the camera to enable the picture obtained by photographing after adjustment to meet the preset exposure requirement. The shutter of the camera is adjusted, namely the exposure time of the camera is adjusted, the exposure time and the gain of the camera are recorded, the preset exposure requirement is that the exposure is not excessive and the exposure is not insufficient, the brightness of each lamp bead in the picture behind the shutter of the camera is adjusted to obtain a proper exposure value, and the display effect of the picture after photographing is ensured.
Step S3: extracting the brightness of each lamp bead in the picture through a closed-loop structure, and identifying the average value of the brightness of all the lamp beads in the picture; the brightness of each lamp bead in the picture refers to the brightness of the Micro-LED display module in the picture at the position of each LED lamp bead; the display effect is represented through the uniformity of the brightness of the lamp beads in the picture, and the closed-loop structure is utilized to immediately extract the brightness of the lamp beads in the picture after the picture displayed by the display screen is shot, so that the display effect is fed back in real time.
In an alternative embodiment of the present disclosure, step S3 includes:
extracting the brightness of each lamp bead in the picture through an upper computer in a closed-loop structure, and generating a lamp bead brightness image; wherein, the upper computer can be a PC or other processors;
carrying out display uniformity identification on the lamp bead brightness image to obtain a display gray-scale image;
and determining the average value of the brightness of all the lamp beads in the displayed gray-scale image.
In a preferred embodiment of the present disclosure, generating compensation data for uniformity of a display screen based on an average value of brightness of all beads in a picture and brightness of each bead includes:
determining the difference value between the brightness and the average value of each lamp bead according to the captured display gray-scale image and the average value of the brightness of all the lamp beads; representing the display effect by the difference value between the brightness of each lamp bead in the captured display gray-scale image and the average value of the brightness of all the lamp beads, and measuring the uniformity of the display screen;
and generating compensation data of the uniformity of the display screen based on the magnitude relation between the difference value and the unit value of the compensation gray-scale data.
The unit value of the compensation gray-scale data is an adjustable minimum value, and the unit value is a positive value; accurate compensation data of uniformity of the display screen is obtained by calculating the size relation between the difference value and the unit value, so that the picture compensated by the compensation data is uniformly displayed, and overcompensation or deficiency is avoided;
the compensation data of the uniformity of the display screen may be generated according to a plurality of modes, and in an optional implementation manner, the generation mode of the compensation data may be: subtracting the brightness of the lamp beads from the average value of the brightness of all the lamp beads to obtain a difference value; dividing the difference by the unit value to obtain a ratio; the ratio is kept in an integer according to a rounding method to obtain an approximate value, wherein the approximate value is compensation data corresponding to the lamp beads, and the positive and negative of the difference value corresponds to the positive and negative of the compensation data;
in an alternative embodiment, the generation mode of the compensation data may be: if the average value of the brightness of the lamp beads subtracted from the brightness of all the lamp beads is a positive number, and the positive number is more than half of the unit value, subtracting N unit values from the brightness of the lamp beads, so that the absolute value of the difference between the subtracted brightness of the lamp beads and the average value of the brightness of all the lamp beads is less than half of the unit value, namely the subtracted brightness of the lamp beads is closer to the average value of the brightness of the lamp beads, wherein N is a positive integer; if the average value of the brightness of the lamp beads subtracted from the brightness of all the lamp beads is a negative number, and the absolute value of the negative number is more than half of the unit value, adding N unit values to the gray-scale data, so that the absolute value of the difference between the added brightness of the lamp beads and the average value of the brightness of the lamp beads is less than half of the unit value, namely the added brightness of the lamp beads is closer to the average value of the brightness of the lamp beads; the compensation data is N unit values subtracted or added in the operation process, and the addition operation or the subtraction operation corresponds to the positive and negative of the compensation data.
Step S4: and generating compensation data of the uniformity of the display screen based on the average value of the brightness of all the lamp beads in the picture and the brightness of each lamp bead, and compensating a preset single gray scale picture by using the compensation data. And the calibration of the compensation data of the uniformity of the preset single gray-scale image display screen is realized.
In an alternative embodiment, in addition to the brightness of each bead in the picture and the average value of the brightness of all beads, the compensation data of the uniformity of the display screen needs to be generated by combining the preset single gray-scale map, the brightness of each bead in reality, the shutter and gain of the camera, and the like.
The single gray scale image is compensated through the compensation data of the uniformity of the display screen, and the picture can be uniformly displayed on the display screen after compensation, so that the accuracy of the generated compensation data is reflected, the calibration effect of the compensation data is verified, and the calibration problem is solved; in addition, the uniformity of the display screen is compensated, so that the technical effect that the display screen uniformly displays pictures is realized, and the problem that the display screen cannot uniformly display pictures in the related art is solved.
In an optional embodiment of the disclosure, after compensating the preset single gray-scale map with the compensation data in step S4, the method further includes:
step S1 to step S3 are executed again on the compensated single gray scale image to obtain the average value of the brightness of all the lamp beads and the brightness of each lamp bead in the compensated image which accords with the preset exposure requirement; judging the compensation effect through the fed-back compensation picture in order to verify whether the compensated single gray-scale picture can be uniformly displayed on the display screen;
judging whether the difference value between the brightness of each lamp bead in the compensation picture and the average value of the brightness of all the lamp beads is within a preset range or not; the preset range may be a unit value of the compensation gray-scale data, that is, a minimum value of the adjustment gray-scale data;
if the compensation data are within the preset range, obtaining optimal compensation data; the display is uniform, the display effect achieves the compensation effect, and accurate optimal compensation data of the uniformity of the display screen are obtained;
if the non-uniformity is within the preset range, repeating the step S4 and the step S1 to the step S3 based on the average value of the brightness of all the lamp beads in the compensation picture and the brightness of each lamp bead until the difference value is within the preset range, and obtaining the optimal compensation data. And displaying unevenly, wherein the display effect cannot reach the compensation effect, and repeatedly generating compensation data of the uniformity of the display screen until the display effect reaches the compensation effect.
In a preferred embodiment of the present disclosure, after obtaining the optimal compensation data, the method further comprises:
repeatedly executing the steps S1 to S4 on the single gray level graph with different gray levels from the preset single gray level graph until the optimal compensation data of the uniformity of the display screen under different gray levels is obtained; generating corresponding uniformity compensation data of the display screen according to single gray-scale graphs of different gray scales, and generating optimal compensation data under each gray scale;
the gray scale data of the preset single gray scale map corresponds to a preset range, the preset range is a unit value of compensation gray scale data, the unit values corresponding to different gray scales can be different or the same, and the optimal compensation data of the uniformity of the display screen under different gray scales are different. For different gray scales, the brightness difference of the lamp beads is larger, and corresponding unit values are different when each single gray scale image is compensated.
From the above description, it can be seen that the present disclosure achieves the following technical effects:
the method adopts a closed-loop feedback mode, applies compensation data after generating the uniformity compensation data of the display screen, obtains photographing feedback of the camera in real time, and adjusts the generated compensation data again according to the feedback effect until the uniformity compensation data of the display screen is optimal compensation data, obtains the uniformity compensation data of the display screen with accurate different gray scales, and realizes uniform display pictures.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
The embodiment of the disclosure also provides a calibration device for the uniformity of the display screen, which adopts a closed-loop structure, as shown in fig. 2, wherein the closed-loop structure comprises an upper computer, a lower computer, the display screen and a camera which are sequentially connected, and the camera is connected with the upper computer; the upper computer and the lower computer can be connected through Gigabit Ethernet (GE for short) or through USB;
the upper computer is used for storing a plurality of single gray-scale images with different gray scales, selecting one Shan Huijie image from the single gray-scale images with different gray scales as a preset single gray-scale image, extracting the brightness of each lamp bead in the image fed back by the camera, identifying the average value of the brightness of all the lamp beads in the image, and generating compensation data of the uniformity of the display screen;
specifically, the upper computer may be a PC or other processors, and is configured to extract the brightness of each bead in the picture, generate a bead brightness image, perform display uniformity identification on the bead brightness image, obtain a display gray-scale image, and determine an average value of brightness of all the beads in the display gray-scale image; the display effect is represented through the uniformity of the brightness of the lamp beads in the picture, and the closed-loop structure is utilized to feed back the lamp beads to the upper computer in real time after the camera shoots the picture displayed on the display screen, so that the brightness of the lamp beads in the picture is extracted, and the display effect is measured.
Further, the upper computer is used for determining the difference value between the brightness and the average value of each lamp bead according to the captured display gray-scale image and the average value of the brightness of all the lamp beads, and generating compensation data of the uniformity of the display screen based on the magnitude relation between the difference value and the unit numerical value of the compensation gray-scale data.
Representing the display effect by the difference value between the brightness of each lamp bead in the captured display gray-scale image and the average value of the brightness of all the lamp beads, and measuring the uniformity of the display screen; the unit value of the compensation gray-scale data is an adjustable minimum value, the unit value is a positive value, and accurate compensation data of uniformity of the display screen is obtained by calculating the size relation between the difference value and the unit value, so that a picture compensated by the compensation data is uniformly displayed, and overcompensation or deficiency is avoided; the generation mode of the compensation data of the uniformity of the display screen can be as follows:
the first generation mode is as follows: subtracting the brightness of the lamp beads from the average value of the brightness of all the lamp beads to obtain a difference value; dividing the difference by the unit value to obtain a ratio; the ratio is kept in an integer according to a rounding method to obtain an approximate value, wherein the approximate value is compensation data corresponding to the lamp beads, and the positive and negative of the difference value corresponds to the positive and negative of the compensation data; or alternatively
And a second generation mode: if the average value of the brightness of the lamp beads is a positive number, and the positive number is larger than half of the unit value, subtracting N unit values from the brightness of the lamp beads, so that the absolute value of the difference value between the brightness of the lamp beads after subtraction and the average value of the brightness of the lamp beads is smaller than half of the unit value, namely the brightness of the lamp beads after subtraction is closer to the average value of the brightness of the lamp beads, wherein N is a positive integer; if the average value of the brightness of the lamp beads is a negative number and the absolute value of the negative number is more than half of the unit value, adding N unit values to the brightness of the lamp beads, so that the absolute value of the difference between the added brightness of the lamp beads and the average value of the brightness of the lamp beads is less than half of the unit value, namely the added brightness of the lamp beads is closer to the average value of the brightness of the lamp beads; the compensation data is N unit values subtracted or added in the operation process, and the addition operation or the subtraction operation corresponds to the positive and negative of the compensation data.
The lower computer is used for receiving the preset single-gray-scale image and the compensation data sent by the upper computer, compensating the preset single-gray-scale image by using the compensation data, performing conversion processing on the preset single-gray-scale image or the compensated single-gray-scale image, generating a correction image or a compensation correction image, and driving the display screen to display the correction image or the compensation correction image;
specifically, the lower computer may be an FPGA or a CPU, and is configured to perform gamma conversion on a preset single-gray-scale image or a compensated single-gray-scale image, and adjust the contrast of the preset single-gray-scale image or the compensated single-gray-scale image to obtain a corrected image or a compensated corrected image;
the display screen is used for displaying the correction image or compensating the correction image;
the camera is used for photographing the corrected image or the compensation corrected image displayed by the display screen, obtaining a picture or a compensation picture which meets the preset exposure requirement, and feeding back the picture or the compensation picture to the upper computer.
In an optional embodiment of the disclosure, the upper computer is further configured to:
extracting the brightness of each lamp bead in the compensation picture fed back by the camera, and identifying the average value of the brightness of all the lamp beads in the compensation picture; in order to verify whether the compensated single gray-scale image can be uniformly displayed on the display screen, the upper computer judges the compensation effect through the fed-back compensation image;
judging whether the difference value between the average value of the brightness of all the lamp beads in the compensation picture and the brightness of each lamp bead is within a preset range or not; the preset range may be a unit value of the compensation gray-scale data, that is, a minimum value of the adjustment gray-scale data;
if the compensation data are within the preset range, obtaining optimal compensation data; the display is uniform, the display effect achieves the compensation effect, and accurate optimal compensation data of the uniformity of the display screen are obtained;
if the non-uniformity is within the preset range, generating compensation data of the uniformity of the display screen again based on the average value of the brightness of all the lamp beads in the compensation picture and the brightness of each lamp bead; the display is uneven, the display effect cannot reach the compensation effect, and compensation data of the uniformity of the display screen are generated again;
the gray scale data of the preset single gray scale map corresponds to a preset range, the preset range is a unit value of compensation gray scale data, the unit values corresponding to different gray scales can be different or the same, and the optimal compensation data of the uniformity of the display screen under different gray scales are different. Aiming at single gray-scale graphs of different gray scales, the upper computer respectively generates corresponding display screen uniformity compensation data, and generates optimal compensation data under each gray scale.
In an alternative embodiment of the present disclosure, the display screen is a Micro-LED display module.
The method adopts a closed loop feedback mode, applies compensation data after generating the uniformity compensation data of the display screen, obtains photographing feedback of the camera in real time, and adjusts the generated compensation data again according to the feedback effect until the uniformity compensation data of the display screen is optimal compensation data, so as to obtain the uniformity compensation data of the display screen with different gray scales accurately, and realize calibration of the uniformity compensation data of the display screen with a preset single gray scale map; the single gray-scale images with different gray scales are compensated by using the display screen uniformity compensation data with different gray scales, and the compensated single gray-scale images can be uniformly displayed on the display screen, so that the accuracy of the generated compensation data is reflected, the calibration effect of the compensation data is verified, and the calibration problem is solved; in addition, the uniformity of the display screen is compensated, so that the technical effect of uniformly displaying pictures on the display screen is achieved.
The embodiment of the disclosure also provides a display device, which comprises the calibration device for the uniformity of the display screen provided by any one of the above embodiments. The display device can be applied to flexible electronic equipment to realize technologies such as augmented reality, virtual reality, augmented reality, mixed reality and the like. The display device may be a projection portion of an electronic apparatus, such as a projector, head-up display, etc.; the display device can also be a display part of electronic equipment, and the electronic equipment can be any equipment with a display screen, such as a smart phone, a smart watch, a notebook computer, a tablet personal computer, a vehicle recorder, a navigator, a head-mounted equipment and the like.
Those skilled in the art will appreciate that implementing all or part of the above-described method embodiments may be accomplished by way of a computer program to instruct related hardware, and the program may be stored in a computer readable storage medium, which when executed may include the above-described method embodiment. The storage medium may be a magnetic disk, an optical disc, a Read-Only Memory (ROM), a random access Memory (RandomAccess Memory, RAM), a Flash Memory (FM), a hard disk (HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
Although embodiments of the present disclosure have been described with reference to the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the disclosure, and such modifications and variations fall within the scope as defined by the appended claims.
Claims (12)
1. A method for calibrating uniformity of a display screen, the method being applied to a closed-loop structure, the method comprising:
s1: performing conversion processing on a preset single gray-scale image to generate a correction image, and driving a display screen to display the correction image;
s2: photographing the corrected image displayed by the display screen to obtain a picture meeting the preset exposure requirement;
s3: extracting the brightness of each lamp bead in the picture through the closed-loop structure, and identifying the average value of the brightness of all the lamp beads in the picture; and
s4: and generating compensation data of uniformity of the display screen based on the average value of brightness of all the lamp beads in the picture and the brightness of each lamp bead, and compensating the preset single-gray-scale picture by using the compensation data.
2. The method of claim 1, wherein after compensating the preset single gray-scale map using the compensation data, the method further comprises:
step S1 to step S3 are executed again on the compensated single gray scale image to obtain the average value of the brightness of all the lamp beads and the brightness of each lamp bead in the compensated image which accords with the preset exposure requirement;
judging whether the difference value between the average value of the brightness of all the lamp beads in the compensation picture and the brightness of each lamp bead is within a preset range or not;
if the compensation data are within the preset range, obtaining optimal compensation data;
and if the non-uniformity is within the preset range, repeating the step S4 and the step S1 to the step S3 on the basis of the average value of the brightness of all the lamp beads in the compensation picture and the brightness of each lamp bead until the difference value is within the preset range, so as to obtain the optimal compensation data.
3. The method of claim 2, wherein after obtaining the optimal compensation data, the method further comprises:
repeatedly executing the steps S1 to S4 on the single gray level graph with different gray levels from the preset single gray level graph until the optimal compensation data of the uniformity of the display screen under different gray levels is obtained;
the gray scale data of the preset single gray scale map corresponds to the preset range, the preset range is a unit numerical value for compensating the gray scale data, and the optimal compensation data of the uniformity of the display screen under different gray scales are different.
4. The method according to claim 1, wherein the transforming the preset single gray-scale map to generate a corrected image and driving a display screen to display the corrected image comprises:
performing gamma conversion on a preset single gray-scale image, and adjusting the contrast of the preset single gray-scale image to obtain a corrected image;
and displaying the correction image by driving a display screen through a lower computer, wherein the display screen is a Micro-LED display module.
5. The method of claim 1, wherein prior to photographing the corrected image displayed by the display screen, the method further comprises:
and adjusting a shutter of the camera to enable the picture obtained by photographing after adjustment to meet the preset exposure requirement.
6. The method of claim 1, wherein the extracting the brightness of each bead in the picture through the closed loop structure, and identifying the average value of the brightness of all beads in the picture, comprises:
extracting the brightness of each lamp bead in the picture through an upper computer in the closed-loop structure to generate a lamp bead brightness image;
performing display uniformity identification on the lamp bead brightness image to obtain a display gray-scale image;
and determining the average value of the brightness of all the lamp beads in the display gray-scale image.
7. The method of claim 6, wherein generating compensation data for display uniformity based on an average of brightness of all beads in the picture and brightness of each bead comprises:
determining a difference between the brightness of each lamp bead and the average value;
and generating compensation data of the uniformity of the display screen based on the magnitude relation between the difference value and the unit value of the compensation gray scale data.
8. The device is characterized by adopting a closed-loop structure, wherein the closed-loop structure comprises an upper computer, a lower computer, a display screen and a camera which are sequentially connected, and the camera is connected with the upper computer;
the upper computer is used for storing a plurality of single gray-scale images with different gray scales, selecting one Shan Huijie image from the single gray-scale images with different gray scales as a preset single gray-scale image, extracting the brightness of each lamp bead in the image fed back by the camera, identifying the average value of the brightness of all the lamp beads in the image, and generating compensation data of the uniformity of the display screen;
the lower computer is used for receiving the preset single-gray-scale image and the compensation data sent by the upper computer, compensating the preset single-gray-scale image by using the compensation data, performing conversion processing on the preset single-gray-scale image or the compensated single-gray-scale image, generating a correction image or a compensation correction image, and driving the display screen to display the correction image or the compensation correction image;
the camera is used for photographing the corrected image or the compensation corrected image displayed by the display screen to obtain a picture or a compensation picture which meets the preset exposure requirement, and the picture or the compensation picture is fed back to the upper computer.
9. The apparatus of claim 8, wherein the host computer is further configured to:
extracting the brightness of each lamp bead in the compensation picture fed back by the camera, and identifying the average value of the brightness of all the lamp beads in the compensation picture;
judging whether the difference value between the average value of the brightness of all the lamp beads in the compensation picture and the brightness of each lamp bead is within a preset range or not;
if the compensation data are within the preset range, obtaining optimal compensation data;
and if the non-uniformity is within the preset range, generating compensation data of the uniformity of the display screen again based on the average value of the brightness of all the lamp beads in the compensation picture and the brightness of each lamp bead.
10. The apparatus of claim 9, wherein the gray-scale data of the preset single gray-scale map corresponds to the preset range, the preset range is a unit value for compensating the gray-scale data, and the optimal compensation data for uniformity of the display screen is different at different gray scales.
11. The device of claim 8, wherein the display screen is a Micro-LED display module.
12. A display device, characterized in that it comprises a calibration device for the uniformity of a display screen according to any one of claims 8 to 11.
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