CN116884338A - Active Micro LED gamma correction method and display control system - Google Patents
Active Micro LED gamma correction method and display control system 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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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
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- 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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- 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
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
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- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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- G—PHYSICS
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- 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
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Abstract
The embodiment of the invention discloses an active micro LED gamma correction method and a display control system. The method comprises the following steps: selecting a plurality of first gray scales in a signal to be displayed as a plurality of binding points for gamma correction, calculating the theoretical brightness of each binding point according to the gamma value expected to be met by a micro LED screen, and collecting the actual brightness of each binding point displayed in the screen; if the difference between the theoretical brightness and the actual brightness of any binding point is larger than the error threshold value corresponding to the binding point, adjusting a second gray-scale value which corresponds to the binding point in a gamma lookup table and is finally displayed on a screen; fitting a final gamma lookup table for screen display according to the adjusted gamma lookup table; the error threshold corresponding to each binding point is different along with the difference of sensitivity of human eyes to brightness change. The embodiment can improve the display quality.
Description
Technical Field
The embodiment of the invention relates to the technical field of Micro LED display, in particular to an active Micro LED gamma correction method and a display control system.
Background
Micro LED (Micro LightEmitting Diode ) display technology has higher brightness, higher luminous efficiency, and lower power consumption than existing AMOLED (Active-Matrix Organic LightEmitting Diode, active matrix organic light emitting diode) display technology.
However, the Micro LED display technology needs to be based on a TFT (thin film transistor) glass substrate, the threshold voltage and the carrier mobility of the TFT will deviate due to degradation in the preparation process, the driving current will deviate, and the Micro LED chip will have brightness difference, and the two will be superimposed together, so that the brightness of each level of display gray scale will be excessively uneven, and the display effect will be affected. In order to ensure that the gray scale of each level of Micro LED is excessively uniform, the display quality is improved, and gamma correction is required to be carried out on a display screen. However, there is no driving IC designed for Micro LEDs, and gamma correction cannot be performed accurately.
Disclosure of Invention
The embodiment of the invention provides an active Micro LED gamma correction method and a display control system, which can ensure that the gray scale of each level of Micro LED is excessively uniform and improve the display quality.
In a first aspect, an embodiment of the present invention provides an active Micro LED gamma correction method, including:
s110, selecting a plurality of first gray scales in the signal to be displayed as a plurality of binding points for gamma correction
S120, calculating theoretical brightness of each binding point according to gamma values expected to be met by the Micro LED screen, and collecting actual brightness of each binding point displayed in the screen;
s130, if the difference between the theoretical brightness and the actual brightness of any binding point is larger than the error threshold corresponding to the binding point, adjusting the second gray level which corresponds to the binding point in the gamma lookup table and is finally displayed on the screen;
s140, fitting a final gamma lookup table for screen display according to the adjusted gamma lookup table;
the error threshold corresponding to each binding point is different along with the difference of sensitivity of human eyes to brightness change.
In a second aspect, an embodiment of the present invention provides a display control system, including:
one or more processors;
a memory for storing one or more programs,
when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the active Micro LED gamma correction method described above.
In a third aspect, embodiments of the present invention provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the active Micro LED gamma correction method described above.
The embodiment of the invention provides an active Micro LED gamma correction method, which comprises the steps of selecting a plurality of first gray scales in a signal to be displayed as a plurality of binding points for gamma correction, and adjusting corresponding values of the binding points in a gamma lookup table by comparing theoretical brightness and actual brightness of each binding point; and according to the adjusted gamma lookup table, fitting the final gamma lookup table for screen display, ensuring that the gray scale of each level of Micro LED is excessively uniform, and improving the display quality. Particularly, the embodiment considers that the human eyes have different sensitivity to the brightness under different brightness conditions, sets different error thresholds for different gray scales, and provides more accurate reference for qualified correction; the light-emitting diode is particularly matched with the severe nonlinear light-emitting characteristic of a Micro-LED under the low-gray condition, so that the fine adjustment of a strong nonlinear region is realized, and the display quality is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a control Micro LED lighting provided by an embodiment of the present invention;
FIG. 2 is a flow chart of an active Micro LED gamma correction method provided by an embodiment of the invention;
FIG. 3 is a schematic diagram of a gamma curve before and after correction provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the invention, are within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices 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 "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The embodiment of the invention provides an active Micro LED gamma correction method. For the convenience of description of the method, the display principle of Micro LEDs is preferentially introduced. Fig. 1 is a schematic diagram of controlling light emission of Micro LEDs according to an embodiment of the present invention, where a display control system may be an electronic device, or may be an FPGA module, or may be formed by the electronic device and the FPGA module together.
In connection with fig. 1, the display principle of micro LEDs is as follows: first, the display control system receives a signal to be displayed, which may be an image signal, a video signal, or the like, wherein gray-scale information is represented by binary data of a specific number of bits, which is called a gray-scale number of bits. For example, 8-bit gray scale refers to gray scale information represented by 8-bit binary data, and 16-bit gray scale refers to gray scale information represented by 16-bit binary data. The gray level information in the signal to be displayed adopts the gray level number supported by the display signal source, which is usually 8 bits.
Then, the display control system performs gamma conversion on each gray level in the signal to be displayed to obtain another gray level which can be finally displayed in the Micro LED screen. The other gray level uses the number of gray level bits supported by the screen, for example 12 bits. For convenience of distinguishing and description, the number of gray scale bits supported by the display signal source is called a first gray scale bit, and correspondingly, the gray scale adopting the first gray scale bit is called a first gray scale; the number of gray scale bits supported by the Micro LED screen is called a second gray scale bit, and correspondingly, the gray scale adopting the second gray scale bit is called a second gray scale. The gamma conversion is a conversion from a first gray level to a second gray level.
And finally, driving the Micro LEDs to display according to the second gray scales corresponding to the signals to be displayed by the display control system. As shown in fig. 1, the display control system obtains a second gray level according to gamma conversion, so that the driving IC generates a corresponding PWM signal to drive the Micro LED to emit light.
Based on the above display principle, fig. 2 is a flowchart of an active Micro LED gamma correction method according to an embodiment of the present invention. The method is suitable for the situation of gamma correction on the active Micro LED screen display link, and is executed by the display control system. As shown in fig. 1, the method comprises the steps of:
s110, selecting a plurality of first gray scales in the signal to be displayed as a plurality of binding points of gamma correction.
The gray-scale information of the signal to be displayed is represented by an 8-bit binary number, i.e. the first gray-scale bit number is 8, and can be represented by 2 8 A first gray scale; m first gray scales can be selected from the gray scales to serve as gamma correction test points, which are also called binding points; wherein m is less than 2 8 Natural number of (a) is provided.
S120, calculating theoretical brightness of each binding point according to gamma values expected to be met by the screen, and collecting actual brightness of each binding point displayed in the screen.
Theoretical brightness refers to the brightness that a certain gray level is expected to be displayed in a screen; the actual brightness refers to the brightness that the gray scale actually appears in the screen. Wherein the ideal brightness is determined by the selected gamma value, and the ideal brightness satisfies the following formula:
Li＝(Lmax-Lmin)×(G/N) γ +Lmin(1)
wherein, G represents the second gray level, li represents the ideal brightness corresponding to the second gray level, γ is the gamma value that the screen is expected to satisfy, N represents the total number of stages of the second gray level, lmax represents the maximum brightness of the screen displayed at the highest second gray level, lmin represents the minimum brightness of the screen displayed at the lowest second gray level.
In practical applications, γ is usually selected to be between 2.7 and 3.0, and is required to be reduced under the condition of brighter ambient light, and is required to be improved under the condition of darker ambient light, so as to improve the comfort of human eyes. The purpose of the gamma correction is to make the normalized curve of the second gray level versus brightness satisfy the desired gamma value.
Optionally, when calculating the theoretical brightness, firstly, sending a signal to be displayed to the Micro LED for display, collecting brightness data by a brightness meter, and respectively measuring the maximum brightness Lmax and the minimum brightness Lmin of the screen. Then, determining a second gray level corresponding to each binding point according to a gamma lookup table acquired in advance; substituting the second gray level G corresponding to each binding point, the gamma value gamma expected to be met by the screen, and the maximum brightness Lmax and the minimum brightness Lmin into the formula (1), and calculating the theoretical brightness of each binding point. Meanwhile, the actual brightness of each binding point can be measured through the brightness meter.
S130, if the difference between the theoretical brightness and the actual brightness of any binding point is larger than the error threshold corresponding to the binding point, adjusting the second gray level, which corresponds to the binding point in the gamma lookup table and is finally displayed on the screen.
A gamma look-up table is one way to implement gamma conversion. The gamma lookup table is used for storing the corresponding relation between each first gray level and each second gray level, and can determine the gray level information which can be displayed in the screen at last by the first gray level to be displayed in a table lookup mode, so that the gamma conversion is completed. In the LED display based on the FPGA, the gamma lookup table can be loaded into the display control program through the FPGA program, so that uniform display is realized. The present embodiment implements gamma correction by adjusting the look-up table.
Specifically, comparing the gray scale target brightness value of each binding point with the actual measurement value, and if the difference between the ideal brightness and the actual brightness is smaller than the error threshold value, matching the brightness without adjustment; and if the difference between the theoretical brightness and the actual brightness is larger than a preset error threshold, adjusting the corresponding second gray level of each binding point in the gamma lookup table to correct the brightness. Further, if the theoretical brightness of any binding point is greater than the actual brightness, the corresponding second gray level of the binding point in the gamma lookup table is increased so as to increase the actual brightness; and if the theoretical brightness of any binding point is smaller than the actual brightness, reducing the corresponding second gray level of the binding point in the gamma lookup table so as to reduce the actual brightness.
Further, the error threshold may be set to a minimum relative brightness change value perceptible to the human eye. Considering that the sensitivity of human eyes to brightness variation is not constant, different error thresholds are set for binding points in each gray scale range. Specifically, at a specific luminance L, the minimum relative luminance change value Δs perceptible to the human eye is:
where L represents the current luminance, Δl represents the amount of luminance change that can be perceived by the human eye, and K represents a known coefficient. The value range of delta S is 5 per mill-2%, and the formula (2) shows that: when the current screen brightness is different, the value of deltas will be different. In the prior art, the value is usually taken as a fixed value, so that an accurate reference quantity is difficult to provide for gamma correction, and different error thresholds are set for different gray scales according to different sensitivity of human eyes to brightness under different brightness conditions.
In a specific embodiment, since the sensitivity of the human eye to the middle gray level variation is lower than that under the low gray and high gray conditions, the first gray level range representation can be divided into three sections of low gray, middle gray and high gray; and a larger error threshold value is configured for the middle gray interval, and a smaller error threshold value is configured for the low gray interval and the high gray interval. For example, under the condition that gamma=1 before gray scale expansion, dividing a 255 gray scale range into three sections, wherein a low gray scale section comprises 1-30 gray scales, a middle gray scale section comprises 31-199 gray scales, and a high gray scale section comprises 200-255 gray scales; the error threshold value of the binding between the middle gray interval is 2%, and the error threshold value of the binding between the low gray interval and the high gray interval is 1%.
Further, after the gamma lookup table is adjusted for one time aiming at any binding point, the new actual brightness displayed in the screen by the binding point can be continuously collected, the new actual brightness is continuously compared with the ideal brightness, and whether the brightness is consistent or not is checked; and if the difference between the theoretical brightness and the new actual brightness is still greater than the error threshold, returning to the operation of adjusting the gamma lookup table until the difference between the theoretical brightness and the final actual brightness is less than or equal to the error threshold, and ending the correction of the binding point.
And S140, fitting a final gamma lookup table for screen display according to the adjusted gamma lookup table.
After all the binding points are corrected, fitting a gray level compensation curve according to the adjusted second gray level corresponding to each binding point; and modifying the corresponding second gray level of the first gray level outside each binding point in the adjusted gamma lookup table according to the gray level compensation curve to obtain a final gamma lookup table. Therefore, correction of all first gray scales can be completed only by testing part of the first gray scales, test time and calculated amount are reduced, and gamma correction efficiency is improved. The gray-scale compensation curves before and after correction are shown in fig. 3, wherein the abscissa represents the value of the first gray scale, the ordinate represents the value of the second gray scale, and the gray-scale compensation curves show the corresponding relationship between the first gray scale and the second gray scale. It can be seen that the corrected gamma curve is smoother, and the abrupt brightness change can be reduced.
The embodiment provides an active Micro LED gamma correction method, which comprises the steps of selecting a plurality of first gray scales in a signal to be displayed as a plurality of binding points for gamma correction; the corresponding value of each binding point in the gamma lookup table is adjusted by comparing the theoretical brightness and the actual brightness of the binding point; and according to the adjusted gamma lookup table, fitting the final gamma lookup table for screen display, ensuring that the gray scale of each level of Micro LED is excessively uniform, and improving the display quality. Particularly, the embodiment considers that the human eyes have different sensitivity to the brightness under different brightness conditions, sets different error thresholds for different gray scales, and provides more accurate reference for qualified correction; the light-emitting diode is particularly matched with the severe nonlinear light-emitting characteristic of a Micro-LED under the low-gray condition, and fine adjustment of a strong nonlinear region is realized.
Further, for the signal to be displayed of the RGB three-color picture, the signal includes 4 color channels of R (red), G (green), B (blue) and W (white). In order to enhance the display effect, the gamma correction operations of S110 to S140 may be performed for the respective color channels, respectively.
In a specific embodiment, first, a signal to be displayed of a Micro LED is obtained, and a plurality of first gray scales in the signal to be displayed are selected as a plurality of binding points for gamma correction.
Then, for each channel data, the following operations are respectively executed:
s1, displaying data of a current channel in a Micro LED screen, and acquiring the maximum brightness and the minimum brightness of the screen; substituting the maximum brightness, the minimum measurement and the gamma value expected to be met by the Micro LED screen into the formula (1), calculating the theoretical brightness of each binding point under the current channel, and collecting the actual brightness of each binding point under the current channel displayed in the screen;
s2, comparing the theoretical brightness and the actual brightness of each binding point, and if the difference between the theoretical brightness and the actual brightness of any binding point is larger than the error threshold corresponding to the binding point, adjusting the second gray scale corresponding to the binding point in the gamma lookup table and finally displayed on the screen;
s3, fitting a final gamma lookup table according to the adjusted gamma lookup table.
In the above process, each channel corresponds to a set of maximum brightness and minimum measurement, a set of theoretical brightness and actual brightness of each binding point, and a final gamma lookup table; and the final gamma lookup tables of all channels are respectively used for Micro LED display of data of all channels.
Alternatively, the gamma correction of the R, G, B three channels is performed first, and then the gamma correction of the W channel is performed. Through gamma correction of the first three channels, the display deviation of the W channel is also greatly corrected; only a small amount of fine adjustment is required in the correction of the W channel to achieve the desired display effect.
Fig. 4 is a schematic structural diagram of a display control system according to an embodiment of the present invention, and as shown in fig. 4, the apparatus includes a processor 50, a memory 51, an input device 52 and an output device 53; the number of processors 50 in the device may be one or more, one processor 50 being taken as an example in fig. 4; the processor 50, the memory 51, the input means 52 and the output means 53 in the device may be connected by a bus or other means, in fig. 4 by way of example.
The memory 51 is used as a computer readable storage medium for storing software programs, computer executable programs and modules, such as program instructions/modules corresponding to the active Micro LED gamma correction method in the embodiment of the present invention. The processor 50 performs various functional applications of the device and data processing by running software programs, instructions and modules stored in the memory 51, i.e., implements the active Micro LED gamma correction method described above.
The memory 51 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for functions; the storage data area may store data created according to the use of the terminal, etc. In addition, memory 51 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, memory 51 may further include memory located remotely from processor 50, which may be connected to the device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input means 52 may be used to receive entered numeric or character information and to generate key signal inputs related to user settings and function control of the device. The output means 53 may comprise a display device such as a display screen.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the active Micro LED gamma correction method of any of the embodiments.
The computer storage media of embodiments of the invention may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing. Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.
Claims (10)
1. An active Micro LED gamma correction method, comprising:
s110, selecting a plurality of first gray scales in a signal to be displayed as a plurality of binding points for gamma correction;
s120, calculating theoretical brightness of each binding point according to gamma values expected to be met by the Micro LED screen, and collecting actual brightness of each binding point displayed in the screen;
s130, if the difference between the theoretical brightness and the actual brightness of any binding point is larger than the error threshold corresponding to the binding point, adjusting the second gray level which corresponds to the binding point in the gamma lookup table and is finally displayed on the screen;
s140, fitting a final gamma lookup table for screen display according to the adjusted gamma lookup table;
the error threshold corresponding to each binding point is different along with the difference of sensitivity of human eyes to brightness change.
2. The method of claim 1, wherein the first gray scale uses a first number of gray scale bits supported by a display signal source and the second gray scale uses a second number of gray scale bits supported by a screen.
3. The method of claim 1, wherein before adjusting the second gray level of the binding point in the gamma lookup table that is displayed on the screen finally if the difference between the theoretical brightness and the actual brightness of any binding point is greater than the error threshold corresponding to the binding point, further comprising:
dividing a first gray scale range into a low gray scale range, a middle gray scale range and a high gray scale range according to the sensitivity of human eyes to brightness change;
configuring a larger error threshold for the middle gray interval and configuring smaller error thresholds for the low gray interval and the high gray interval;
the error threshold is used for judging whether the theoretical brightness and the actual brightness of each binding point meet the error requirement.
4. The method of claim 1, wherein calculating the theoretical brightness of each binding point according to the gamma value expected to be satisfied by the screen comprises:
determining a second gray level corresponding to each binding point according to a gamma lookup table acquired in advance;
and calculating the theoretical brightness of each binding point according to the second gray level corresponding to each binding point and the gamma value expected to be met by the screen.
5. The method according to claim 1, wherein if the difference between the theoretical brightness and the actual brightness of any binding point is greater than the error threshold corresponding to the binding point, adjusting the second gray level corresponding to the binding point in the gamma lookup table and finally displayed on the screen includes:
if the theoretical brightness of any binding point is greater than the actual brightness, improving the corresponding second gray level of the binding point in the gamma lookup table;
and if the theoretical brightness of any binding point is smaller than the actual brightness, reducing the corresponding second gray level of the binding point in the gamma lookup table.
6. The method according to claim 1, wherein if the difference between the theoretical brightness and the actual brightness of any binding point is greater than the error threshold corresponding to the binding point, adjusting the second gray level corresponding to the binding point in the gamma lookup table and finally displayed on the screen includes:
if the difference between the theoretical brightness and the actual brightness of any binding point is larger than the error threshold value corresponding to the binding point, adjusting the second gray level which corresponds to the binding point in the gamma lookup table and is finally displayed on the screen;
collecting new actual brightness displayed by the binding point in a screen;
and if the difference between the theoretical brightness and the new actual brightness is greater than the error threshold, returning to the operation of adjusting the gamma lookup table until the difference between the theoretical brightness and the final actual brightness is less than or equal to the error threshold.
7. The method of claim 1, wherein fitting the final gamma look-up table for screen display based on the adjusted gamma look-up table comprises:
fitting a gray level compensation curve according to the adjusted second gray level corresponding to each binding point;
and modifying the corresponding second gray level of the first gray level outside each binding point in the adjusted gamma lookup table according to the gray level compensation curve to obtain a final gamma lookup table.
8. The method of claim 1, wherein the signal to be displayed comprises a plurality of color channels, and the gamma correction operations of S110-S140 are performed for each color channel.
9. A display control system, comprising:
one or more processors;
a memory for storing one or more programs,
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the active Micro LED gamma correction method of any of claims 1-8.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the active Micro LED gamma correction method according to any one of claims 1-8.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117809561A (en) * | 2024-01-04 | 2024-04-02 | 深圳市美矽微半导体股份有限公司 | White balance calibration method and device for LED display screen, electronic equipment and medium |
| WO2025123410A1 (en) * | 2023-12-12 | 2025-06-19 | 上海和辉光电股份有限公司 | Grayscale compensation method for display panel, apparatus and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025123410A1 (en) * | 2023-12-12 | 2025-06-19 | 上海和辉光电股份有限公司 | Grayscale compensation method for display panel, apparatus and system |
| CN117809561A (en) * | 2024-01-04 | 2024-04-02 | 深圳市美矽微半导体股份有限公司 | White balance calibration method and device for LED display screen, electronic equipment and medium |
| CN117809561B (en) * | 2024-01-04 | 2024-12-17 | 深圳市美矽微半导体股份有限公司 | White balance calibration method and device for LED display screen, electronic equipment and medium |
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