CN114664267B - Voltage compensation method and device and display device - Google Patents
Voltage compensation method and 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
- G09G3/34—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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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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
- G09G2320/0271—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
- 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
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Abstract
The application provides a voltage compensation method, a voltage compensation device and a display device, which relate to the technical field of display and solve the problem of uneven display brightness caused by power consumption reduction, wherein the method comprises the steps of obtaining initial display data and theoretical display brightness values of the display device, and determining corresponding initial power supply voltage, initial gamma voltage and actual display brightness values; according to the actual display brightness value and the theoretical display brightness value, compensating the initial power supply voltage and the initial gamma voltage to obtain corresponding compensation power supply voltage and compensation gamma voltage; and inputting the compensation power supply voltage and the compensation gamma voltage into the display device to obtain the brightness with the same theoretical display brightness. According to the display device and the display method, the initial power supply voltage and the initial gamma voltage are compensated, the obtained compensation power supply voltage and the compensation gamma voltage are input to the display for displaying, so that brightness change in a display picture is effectively compensated, and the problem of uneven brightness caused by a display device is solved.
Description
Technical Field
The application relates to the technical field of display, in particular to a voltage compensation method and device and a display device.
Background
Digital power management integrated circuits (Digital PMIC) and Timing Controllers (TCON) are devices commonly used in liquid crystal display driving. The Digital power management integrated circuit (Digital PMIC) mainly comprises a Register, a Digital-to-analog converter (Digital to Analog Converter, DAC), a low dropout linear voltage regulator (low dropout regulator, GLDO) module and a gamma correction module. During application, data input by a data line SDA and a clock signal line SCL from an I2C bus are stored in a register, digital signals output by the register are converted into analog signals by a digital-to-analog converter, then the analog signals are input into a GLDO module and a gamma correction module, the GLDO module is a low-dropout linear voltage stabilizer for generating a gamma reference voltage Vref, the GLDO module generates the gamma reference voltage Vref according to the input analog signals and an analog voltage AVDD for gamma correction, then the GLDO module outputs a common gamma reference voltage Vref to the gamma correction module, and each circuit contained by the gamma correction module correspondingly outputs fourteen paths of gamma voltages Gam 1-Gam 14 respectively.
Because the current requirement on the energy consumption of the display is higher, the energy consumption of the display is reduced by dynamically adjusting the voltage, the display device is easy to cause the problem of uneven display brightness due to voltage adjustment, and the display effect is poor.
Disclosure of Invention
The voltage compensation method and device and the display device can effectively compensate brightness variation in a display picture and solve the problem of uneven brightness caused by reducing power consumption by adjusting voltage.
In one aspect, the present application provides a voltage compensation method, including:
acquiring initial display data of the display device and a theoretical display brightness value corresponding to the initial display data;
according to the initial display data, matching an initial power supply voltage and an initial gamma voltage corresponding to the initial display data;
determining an actual display brightness value corresponding to the display device according to the initial power supply voltage and the initial gamma voltage;
according to the actual display brightness value and the theoretical display brightness value, compensating the initial power supply voltage and the initial gamma voltage to obtain corresponding compensation power supply voltage and compensation gamma voltage;
and inputting the compensation power supply voltage and the compensation gamma voltage to a display device to obtain target display brightness, wherein the target display brightness is the same as the theoretical display brightness corresponding to the theoretical display brightness value.
In one possible implementation manner of the present application, the adjusting the initial power supply voltage and the initial gamma voltage according to the actual display brightness value and the theoretical display brightness value to obtain the compensated power supply voltage and the compensated gamma voltage includes:
determining a brightness value difference value according to the theoretical display brightness value and the actual display brightness value;
determining a voltage compensation coefficient according to the brightness value difference value;
and compensating the initial power supply voltage and the initial gamma voltage corresponding to the initial display data according to the voltage compensation coefficient to obtain the compensation power supply voltage and the compensation gamma voltage corresponding to the initial display data.
In one possible implementation manner of the present application, the voltage compensation coefficient includes a first voltage compensation coefficient and a second voltage compensation coefficient, and determining the voltage compensation coefficient according to the brightness value difference value includes:
comparing the brightness value difference value with a preset brightness difference threshold value to obtain a brightness difference comparison result;
and determining the second voltage compensation coefficient according to the brightness difference comparison result.
In one possible implementation manner of the present application, the determining the second voltage compensation coefficient according to the brightness difference comparison result includes:
the brightness difference comparison result comprises that the brightness value difference value is larger than or equal to the brightness difference threshold value and the brightness value difference value is smaller than the brightness difference threshold value;
when the brightness difference comparison result is that the brightness value difference value is larger than or equal to the brightness difference threshold value, determining that the second voltage compensation coefficient is a coefficient with the value smaller than or equal to 1;
and when the brightness difference comparison result is that the brightness value difference is smaller than the brightness difference threshold value, determining that the second voltage compensation coefficient is a coefficient with the value larger than 1.
In one possible implementation manner of the present application, the compensating, according to the voltage compensation coefficient, the initial power supply voltage and the initial gamma voltage corresponding to the initial display data to obtain the compensated power supply voltage and the compensated gamma voltage corresponding to the initial display data includes:
and compensating the initial power supply voltage and the first-stage initial gamma voltage of the initial gamma voltage according to the first voltage compensation coefficient to obtain the compensated power supply voltage and the first-stage compensated gamma voltage of the compensated gamma voltage.
In one possible implementation manner of the present application, the compensating, according to the voltage compensation coefficient, the initial power supply voltage and the initial gamma voltage corresponding to the initial display data to obtain the compensated power supply voltage and the compensated gamma voltage corresponding to the initial display data includes:
and compensating the second-stage initial gamma voltage to the fourteenth-stage initial gamma voltage of the initial gamma voltage according to the second voltage compensation coefficient to obtain a second-stage compensation gamma voltage and a fourteenth-stage compensation gamma voltage of the compensation gamma voltage.
In one possible implementation manner of the present application, the matching, according to the initial display data, an initial power supply voltage and an initial gamma voltage corresponding to the initial display data includes:
determining the gray scale duty ratio of the image in the initial display data according to the initial display data;
and determining an initial power supply voltage and an initial gamma voltage corresponding to the display data according to the image gray scale duty ratio.
In one possible implementation manner of the present application, the determining, according to the initial display data, an image gray scale duty ratio in the initial display data includes:
determining the number of images with the image gray-scale values of a preset target gray-scale value in the initial display data to obtain the number of target gray-scale images;
and calculating the duty ratio of the target gray-scale image quantity in the total image quantity of the initial display data to obtain the gray-scale duty ratio of the image.
In another aspect, the present application provides a voltage compensation device, the device comprising:
the input module is used for acquiring initial display data of the display device and theoretical display brightness values corresponding to the initial display data;
the matching module is used for matching the initial power supply voltage and the initial gamma voltage corresponding to the initial display data according to the initial display data;
the determining module is used for determining an actual display brightness value corresponding to the display device according to the initial power supply voltage and the initial gamma voltage;
the compensation module is used for adjusting the initial power supply voltage and the initial gamma voltage according to the actual display brightness value and the theoretical display brightness value to obtain the compensation power supply voltage and the compensation gamma voltage;
the display module is used for inputting the compensation power supply voltage and the compensation gamma voltage to a display device to obtain target display brightness, and the target display brightness is the same as the theoretical display brightness corresponding to the theoretical display brightness value;
the compensation module specifically comprises:
the brightness value difference value is determined according to the theoretical display brightness value and the actual display brightness value;
the voltage compensation coefficient is determined according to the brightness value difference value;
and the compensation module is used for compensating the initial power supply voltage and the initial gamma voltage corresponding to the initial display data according to the voltage compensation coefficient to obtain the compensation power supply voltage and the compensation gamma voltage corresponding to the initial display data.
The voltage compensation coefficient comprises a first voltage compensation coefficient and a second voltage compensation coefficient, and the compensation module is also specifically:
the brightness value difference value is compared with a preset brightness difference threshold value to obtain a brightness difference comparison result;
and determining the second voltage compensation coefficient according to the brightness difference comparison result.
The brightness difference comparison result comprises that the brightness value difference value is larger than or equal to the brightness difference threshold value and the brightness value difference value is smaller than the brightness difference threshold value;
the compensation module is also specifically:
when the brightness difference comparison result is that the brightness value difference is greater than or equal to the brightness difference threshold value, determining that the second voltage compensation coefficient is a coefficient with the value less than or equal to 1;
and determining that the second voltage compensation coefficient is a coefficient with a value greater than 1 when the brightness difference comparison result is that the brightness value difference is smaller than the brightness difference threshold value.
The compensation module is also specifically:
and the first-stage compensation gamma voltage is used for compensating the initial power supply voltage and the first-stage initial gamma voltage of the initial gamma voltage according to the first voltage compensation coefficient to obtain the compensation power supply voltage and the first-stage compensation gamma voltage of the compensation gamma voltage.
And the compensation module is used for compensating the second-stage initial gamma voltage to the fourteenth-stage initial gamma voltage of the initial gamma voltage according to the second voltage compensation coefficient to obtain the second-stage compensation gamma voltage and the fourteenth-stage compensation gamma voltage of the compensation gamma voltage.
The matching module specifically comprises:
the method comprises the steps of determining an image gray scale duty ratio in initial display data according to the initial display data;
and the display device is used for determining an initial power supply voltage and an initial gamma voltage corresponding to the display data according to the image gray scale duty ratio.
The matching module is also specifically:
the method comprises the steps of determining the number of images with the image gray scale value of a preset target gray scale value in initial display data to obtain the number of target gray scale images;
and the method is used for calculating the duty ratio of the target gray-scale image quantity in the total image quantity of the initial display data to obtain the gray-scale image duty ratio.
On the other hand, the application also provides a display device, and the display device adopts the voltage compensation method or the voltage compensation device.
After initial display data and initial power supply voltage and initial gamma voltage corresponding to the initial display data are obtained, the initial power supply voltage and the initial gamma voltage are input into a display device for display, whether the actual display brightness value and the theoretical display brightness value of actual display are the same or not is judged, when brightness values are different, the initial power supply voltage and the initial gamma voltage are compensated to obtain compensation power supply voltage and compensation gamma voltage, the obtained compensation power supply voltage and compensation gamma voltage are input into the display device, the target display brightness of the display at the moment is the same as the theoretical display brightness, so that brightness change in a display picture is effectively compensated, and the problem of uneven brightness due to the display device is solved.
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 described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow diagram of one embodiment of a voltage compensation method provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of an embodiment of a display driving module according to the present application;
FIG. 3 is a flow chart of one embodiment of a voltage compensation method provided in an embodiment of the present application;
FIG. 4 is a schematic diagram of voltage correspondence in a memory module according to an embodiment of the present disclosure;
FIG. 5 is a flow chart of one embodiment of a voltage compensation method provided in an embodiment of the present application;
fig. 6 is a schematic structural diagram of an embodiment of a voltage compensation device provided in an embodiment of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present invention, 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 "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 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.
The embodiment of the application provides a voltage compensation method, a voltage compensation device and a display device, and the voltage compensation method, the voltage compensation device and the display device are respectively described in detail below.
In this embodiment, because the current requirement on energy consumption of the display is high, the energy consumption of the display is reduced by dynamically adjusting the voltage, and the display device is easy to have a problem of uneven display brightness due to voltage adjustment, so that the display effect is poor. In order to solve the problem, the application firstly inputs various initial display data into the display device for display, then analyzes the actual display brightness change condition of the display device by combining the theoretical display brightness value corresponding to the initial display data, performs brightness compensation by compensating the initial power supply voltage and the initial gamma voltage input into the display device, and finally stores the compensated power supply voltage and the compensated gamma voltage obtained by compensation in the storage module. In the subsequent practical application process, the display data input to the display device is detected and analyzed, and the compensation power supply voltage and the compensation gamma voltage corresponding to the display data are called from the storage module in real time and input to the display device, so that the aim of compensating brightness is fulfilled.
Referring to fig. 1, a flow chart of an embodiment of a voltage compensation method according to an embodiment of the present application is shown, and the voltage compensation method includes the following steps 101 to 105:
101. initial display data of the display device and theoretical display brightness values corresponding to the initial display data are acquired.
In this embodiment, the display device may be a liquid crystal display (Liquid Crystal Display, LCD) or an organic light emitting diode display (Organic Light Emitting Diode, OLED), and the display device includes a display driving module, a display panel, and an external memory. In the application process, the initial display data of the next frame of display picture to be displayed is input to the display driving module through the external memory, the display driving module carries out detection analysis on the initial display data to obtain a theoretical display brightness value corresponding to the initial display data, and the theoretical display brightness value is the brightness value which the display device actually should display under ideal conditions after the initial display data is input to the display device.
102. According to the initial display data, an initial power supply voltage and an initial gamma voltage corresponding to the initial display data are matched.
As shown in fig. 2, the display driving module includes a timing controller TCON, a digital power management integrated circuit PMIC, and a display driving IC, and after the timing controller TCON obtains initial display data, the timing controller TCON analyzes the initial display data according to the initial display data, and outputs a corresponding initial display driving voltage to the display panel to drive the display panel to display, where the initial display driving voltage includes an initial power voltage AVDD and fourteen paths of initial gamma voltages Gam1 to Gam14.
103. And determining the actual display brightness value corresponding to the display device according to the initial power supply voltage and the initial gamma voltage.
The timing controller TCON calls an initial power supply voltage AVDD corresponding to the initial display data from the storage module, inputs the initial power supply voltage AVDD to the digital power management integrated circuit PMIC, and then the digital power management integrated circuit PMIC determines corresponding fourteen paths of initial gamma voltages Gam1 to Gam14, inputs the initial power supply voltage AVDD and the fourteen paths of initial gamma voltages Gam1 to Gam14 to the display device for display, and obtains an actual display brightness value of a corresponding display picture according to an actual display condition of the display device.
104. And compensating the initial power supply voltage and the initial gamma voltage according to the actual display brightness value and the theoretical display brightness value to obtain corresponding compensation power supply voltage and compensation gamma voltage.
If the actual display brightness and the theoretical display brightness have small differences, the initial power supply voltage and the initial gamma voltage are not required to be adjusted and compensated, and if the actual display brightness and the theoretical display brightness have differences, specific differences of display pictures are required to be confirmed according to the actual display brightness and the theoretical display brightness, the initial power supply voltage and the initial gamma voltage are compensated according to the specific differences, and the corresponding compensation power supply voltage and compensation gamma voltage are finally obtained.
105. And inputting the compensation power supply voltage and the compensation gamma voltage into the display device to obtain target display brightness, wherein the target display brightness is the same as the theoretical display brightness corresponding to the theoretical display brightness value.
After the compensation power supply voltage and the compensation gamma voltage corresponding to the initial display data are determined, the compensation power supply voltage and the compensation gamma voltage are input into the display device for verification to obtain target display brightness, and at the moment, the target display brightness of the display picture subjected to voltage compensation is the same as the theoretical display brightness corresponding to the theoretical display brightness value, so that the initial display driving voltage compensation and the brightness compensation of the display picture input into the display device are realized.
After initial display data and initial power supply voltage and initial gamma voltage corresponding to the initial display data are obtained, the initial power supply voltage and the initial gamma voltage are input into a display device for display, whether the actual display brightness value and the theoretical display brightness value of actual display are the same or not is judged, when brightness values are different, the initial power supply voltage and the initial gamma voltage are compensated to obtain compensation power supply voltage and compensation gamma voltage, the obtained compensation power supply voltage and compensation gamma voltage are input into the display device, the target display brightness of the display at the moment is the same as the theoretical display brightness, so that brightness change in a display picture is effectively compensated, and the problem of uneven brightness due to the display device is solved.
In another embodiment of the present application, as shown in fig. 3, according to an actual display brightness value and a theoretical display brightness value, an initial power supply voltage and an initial gamma voltage are adjusted to obtain a compensation power supply voltage and a compensation gamma voltage, which includes steps 201 to 203:
201. and determining a brightness value difference value according to the theoretical display brightness value and the actual display brightness value.
If the theoretical display brightness value obtained according to the initial display data is N i The actual display brightness value obtained according to the initial display data is M i Wherein i is the ith display partition of the display picture, N i Theoretical display luminance value for the ith display partition, M i Setting the difference value of the brightness value as K for the actual display brightness value of the ith display partition i The difference value of the brightness value obtained by calculation is K i ＝M i -N i . In this embodiment, the brightness value difference of each display partition is calculated by a preset algorithm, where the preset algorithm may be a linear interpolation method. Of course, in other embodiments, the preset algorithm may be other algorithms.
202. And determining a voltage compensation coefficient according to the brightness value difference value.
According to the difference between the brightness value and the theoretical display brightness, the difference between the actual display brightness and the theoretical display brightness can be judged, and then the voltage compensation coefficients of the corresponding initial power supply voltage and the initial gamma voltage are determined, so that accurate compensation is conveniently performed on the initial display driving voltage.
In this embodiment, determining the voltage compensation coefficient according to the luminance value difference value specifically includes:
and comparing the brightness value difference with a preset brightness difference threshold value to obtain a brightness difference comparison result.
The obtained brightness value difference value is compared with a brightness difference threshold value to obtain a brightness difference comparison result, and a specific difference between the current actual display brightness value and the theoretical display brightness value can be quantified through the brightness difference comparison result.
The brightness difference threshold can be set to any value, and can be obtained through model training iteration or manually set according to experience. In the present embodiment, the luminance difference threshold is set to 0, and when the luminance difference threshold is 0, the luminance difference comparison result includes that the luminance value difference is greater than or equal to the luminance difference threshold and the luminance value difference is smaller than the luminance difference threshold, specifically, when the luminance value difference K i (K i ＝M i -N i ) When the brightness difference threshold value is greater than or equal to 0, the actual display brightness value is M i Greater than or equal to the theoretical display brightness value N i Namely, the display brightness of the ith display partition of the display device is higher or moderate; when the brightness value is different from K i (K i ＝M i -N i ) When the brightness difference is smaller than the brightness difference threshold value 0, the actual display brightness value is M i Less than the theoretical display brightness value of N i I.e. the display brightness of the i-th display section of the display device is low.
In this embodiment, since the display brightness of the display device needs to be optimized on the basis of ensuring low power consumption display of the display device, the voltage compensation coefficient includes a first voltage compensation coefficient and a second voltage compensation coefficient, where the first voltage compensation coefficient is used to compensate the initial power supply voltage and the first-stage gamma voltage of the initial gamma voltage, the second voltage compensation coefficient is used to compensate the second-stage gamma voltage to the fourteenth-stage gamma voltage of the initial gamma voltage, that is, the first-stage gamma voltage of the initial power supply voltage and the first-stage gamma voltage of the initial gamma voltage are compensated by the first compensation coefficient, so as to achieve the purpose of low power consumption display of the display device, and the second-stage gamma voltage to the fourteenth-stage gamma voltage of the initial gamma voltage are compensated by the second compensation coefficient, so as to achieve fine adjustment of the second-stage gamma voltage to the fourteenth-stage gamma voltage of the initial gamma voltage, thereby achieving brightness compensation of the display device.
Therefore, in the present embodiment, determining the voltage compensation coefficient according to the luminance value difference value specifically includes:
and determining a second voltage compensation coefficient according to the brightness difference comparison result.
Specifically, when the brightness difference comparison result is that the brightness value difference is greater than or equal to the brightness difference threshold, the display brightness of the ith display partition of the display device is higher or the display brightness is moderate, and the second-level gamma voltage to the fourteenth-level gamma voltage input into the display device needs to be reduced or maintained, and then the second voltage compensation coefficient is determined to be a coefficient with the value less than or equal to 1;
when the brightness difference comparison result is that the brightness value difference is smaller than the brightness difference threshold value, the display brightness of the ith display partition of the display device is lower, the second-level gamma voltage to the fourteenth-level gamma voltage input into the display device is required to be increased, and the second voltage compensation coefficient is determined to be a coefficient with the value larger than 1.
203. And compensating the initial power supply voltage and the initial gamma voltage corresponding to the initial display data according to the voltage compensation coefficient to obtain a compensation power supply voltage and a compensation gamma voltage corresponding to the initial display data.
Compensating the initial power supply voltage and the initial gamma voltage corresponding to the initial display data according to the voltage compensation coefficient to obtain a compensation power supply voltage and a compensation gamma voltage corresponding to the initial display data, comprising:
and compensating the initial power supply voltage and the first-stage initial gamma voltage of the initial gamma voltage according to the first voltage compensation coefficient to obtain a compensated power supply voltage and a first-stage compensated gamma voltage of the compensated gamma voltage.
And compensating the second-stage initial gamma voltage to the fourteenth-stage initial gamma voltage of the initial gamma voltage according to the second voltage compensation coefficient to obtain a second-stage compensation gamma voltage and a fourteenth-stage compensation gamma voltage of the compensation gamma voltage.
In this embodiment, the initial power supply voltage AVDD and the first-stage initial gamma voltage GAM1 are multiplied by first voltage compensation coefficients respectively to obtain a compensated power supply voltage AVDD 'and a first-stage compensated gamma voltage GAM1', where the first voltage compensation coefficients are coefficients smaller than 1, that is, the corresponding compensation relationships between the initial power supply voltage and the first initial gamma voltage and the compensated power supply voltage and the first compensated initial gamma voltage are: the compensation power voltage AVDD '< the initial power voltage AVDD, the first-stage compensation gamma voltage GAM1' < G the first-stage initial gamma voltage GAM1;
multiplying the second-stage initial gamma voltages GAM2 to GAM14 by second-stage compensation coefficients to obtain second-stage compensation gamma voltages GAM2 'to GAM14', respectively, wherein the corresponding compensation relationships between the second-stage initial gamma voltages and the second-stage compensation gamma voltages to the fourteenth-stage compensation gamma voltages are as follows: the second to fourteenth compensation gamma voltages GAM2 'to GAM14' are adaptively trimmed based on the second to fourteenth initial gamma voltages GAM2 to GAM14, and the obtained corresponding gray scale brightness of the display panel is ensured to be unchanged.
The relationship between the initial power supply voltage AVDD and the initial gamma voltage GAM and the respective corresponding compensation power supply voltage AVDD 'and compensation gamma voltage GAM' is stored in the memory module, and the stored relationship is shown in fig. 4. In the actual compensation process, the corresponding compensation power supply voltage AVDD 'and compensation gamma voltage GAM' are called from the memory module through the timing controller TCON.
In another embodiment of the present application, as shown in fig. 5, according to initial display data, matching an initial power supply voltage and an initial gamma voltage corresponding to the initial display data includes the following steps 301 to 302:
301. and determining the gray scale duty ratio of the image in the initial display data according to the initial display data.
According to the initial display data, determining the gray scale duty ratio of the image in the initial display data specifically comprises the following steps:
determining the number of images with the image gray-scale values of a preset target gray-scale value in the initial display data to obtain the number of target gray-scale images;
specifically, after receiving initial display data of a next frame of display picture input by the external memory, the timing controller TCON performs detection analysis on the initial display data, and analyzes the number of images with different gray scales in the initial display data to determine the number of images with a preset target gray scale value in the initial display data, so as to obtain the number of target gray scale images. The preset target gray scale value may be set in the manual pre-display driving module.
For example, when the preset target gray-scale value is set to 233, the timing controller TCON analyzes that the number of gray-scales of 233 in the initial display data is 20, and the number of the obtained target gray-scales is 20, and the preset target gray-scale value may be a target gray-scale range formed by a plurality of gray-scales of different gray-scale values.
Calculating the duty ratio of the target gray-scale image quantity in the total image quantity of the initial display data to obtain the gray-scale duty ratio of the image;
for example, if the size of the frame image data is 100×100=10000 and the number of the obtained target gray levels is 20, the calculated image gray level ratio is 20/10000=0.2%.
302. According to the image gray scale duty ratio, an initial power supply voltage and an initial gamma voltage corresponding to the display data are determined.
The time sequence controller TCON analyzes the gray scale type of the initial display data according to the image gray scale duty ratio in the initial display data obtained through analysis, the gray scale type of the initial display data comprises low gray scale initial display data and high gray scale initial display data, and then an initial power supply voltage and an initial gamma voltage corresponding to the display data are determined according to the gray scale type.
Specifically, when the input of the input end of the time sequence controller TCON is determined to be low-gray-scale initial display data according to the gray scale duty ratio of the image, the time sequence controller TCON reads the corresponding low-voltage initial power supply voltage and writes the low-voltage initial power supply voltage into the digital power supply management integrated circuit PMIC through the detection and analysis function, and transmits the low-gray-scale initial display data, the low-voltage initial power supply voltage and the corresponding low-voltage initial gamma voltage group to the display driving IC;
and otherwise, when the input of the input end of the time sequence controller TCON is determined to be the high-gray-scale initial display data according to the gray scale duty ratio of the image, the time sequence controller TCON reads the corresponding high-voltage initial power supply voltage and writes the high-voltage initial power supply voltage into the digital power supply management integrated circuit PMIC through the detection and analysis function, and the high-gray-scale initial display data, the high-voltage initial power supply voltage and the high-voltage initial gamma voltage group are transmitted to the display driving IC.
In order to better implement the voltage compensation method in the embodiment of the present application, based on the voltage compensation method, a voltage compensation device is further provided in the embodiment of the present application, as shown in fig. 6, where the voltage compensation device 400 includes:
an input module 401, configured to obtain initial display data of the display device and a theoretical display luminance value corresponding to the initial display data;
a matching module 402, configured to match an initial power supply voltage and an initial gamma voltage corresponding to the initial display data according to the initial display data;
a determining module 403, configured to determine an actual display luminance value corresponding to the display device according to the initial power supply voltage and the initial gamma voltage;
the compensation module 404 is configured to adjust the initial power supply voltage and the initial gamma voltage according to the actual display brightness value and the theoretical display brightness value, so as to obtain the compensation power supply voltage and the compensation gamma voltage;
the display module 405 is configured to input the compensation power supply voltage and the compensation gamma voltage to a display device, so as to obtain a target display brightness, where the target display brightness is the same as the theoretical display brightness corresponding to the theoretical display brightness value;
the compensation module 404 specifically includes:
the brightness value difference value is determined according to the theoretical display brightness value and the actual display brightness value;
the voltage compensation coefficient is determined according to the brightness value difference value;
and the compensation module is used for compensating the initial power supply voltage and the initial gamma voltage corresponding to the initial display data according to the voltage compensation coefficient to obtain the compensation power supply voltage and the compensation gamma voltage corresponding to the initial display data.
The voltage compensation coefficient includes a first voltage compensation coefficient and a second voltage compensation coefficient, and the compensation module 404 is further specifically:
the brightness value difference value is compared with a preset brightness difference threshold value to obtain a brightness difference comparison result;
and determining the second voltage compensation coefficient according to the brightness difference comparison result.
The brightness difference comparison result comprises that the brightness value difference value is larger than or equal to the brightness difference threshold value and the brightness value difference value is smaller than the brightness difference threshold value;
the compensation module 404 is further specifically:
when the brightness difference comparison result is that the brightness value difference is greater than or equal to the brightness difference threshold value, determining that the second voltage compensation coefficient is a coefficient with the value less than or equal to 1;
and determining that the second voltage compensation coefficient is a coefficient with a value greater than 1 when the brightness difference comparison result is that the brightness value difference is smaller than the brightness difference threshold value.
The compensation module 404 is further specifically:
and the first-stage compensation gamma voltage is used for compensating the initial power supply voltage and the first-stage initial gamma voltage of the initial gamma voltage according to the first voltage compensation coefficient to obtain the compensation power supply voltage and the first-stage compensation gamma voltage of the compensation gamma voltage.
And the compensation module is used for compensating the second-stage initial gamma voltage to the fourteenth-stage initial gamma voltage of the initial gamma voltage according to the second voltage compensation coefficient to obtain the second-stage compensation gamma voltage and the fourteenth-stage compensation gamma voltage of the compensation gamma voltage.
The matching module 402 specifically includes:
the method comprises the steps of determining an image gray scale duty ratio in initial display data according to the initial display data;
and the display device is used for determining an initial power supply voltage and an initial gamma voltage corresponding to the display data according to the image gray scale duty ratio.
The matching module 402 further specifically includes:
the method comprises the steps of determining the number of images with the image gray scale value of a preset target gray scale value in initial display data to obtain the number of target gray scale images;
and the method is used for calculating the duty ratio of the target gray-scale image quantity in the total image quantity of the initial display data to obtain the gray-scale image duty ratio.
In another embodiment of the present application, the present application further provides a display device, where the display device uses a voltage compensation method or a voltage compensation apparatus.
The foregoing has described in detail a voltage compensation method, apparatus and display device provided in the embodiments of the present application, and specific examples have been applied herein to illustrate the principles and embodiments of the present invention, and the above description of the embodiments is only for aiding in understanding the method and core idea of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present invention, the present description should not be construed as limiting the present invention.
Claims (7)
1. A method of voltage compensation, comprising:
acquiring initial display data of a display device and a theoretical display brightness value corresponding to the initial display data;
according to the initial display data, matching an initial power supply voltage and an initial gamma voltage corresponding to the initial display data;
determining an actual display brightness value corresponding to the display device according to the initial power supply voltage and the initial gamma voltage;
determining a brightness value difference value according to the theoretical display brightness value and the actual display brightness value;
comparing the brightness value difference value with a preset brightness difference threshold value to obtain a brightness difference comparison result;
the brightness difference comparison result comprises that the brightness value difference value is larger than or equal to the brightness difference threshold value and the brightness value difference value is smaller than the brightness difference threshold value;
when the brightness difference comparison result is that the brightness value difference is larger than or equal to the brightness difference threshold value, determining that a second voltage compensation coefficient in the voltage compensation coefficients is a coefficient with the value smaller than or equal to 1, wherein the second voltage compensation coefficient is used for compensating second-stage gamma voltage to fourteenth-stage gamma voltage of the initial gamma voltage;
when the brightness difference comparison result is that the brightness value difference value is smaller than the brightness difference threshold value, determining that the second voltage compensation coefficient is a coefficient with a value larger than 1;
according to the voltage compensation coefficient, compensating an initial power supply voltage and an initial gamma voltage corresponding to the initial display data to obtain the compensation power supply voltage and the compensation gamma voltage corresponding to the initial display data; and inputting the compensation power supply voltage and the compensation gamma voltage to a display device to obtain target display brightness, wherein the target display brightness is the same as the theoretical display brightness corresponding to the theoretical display brightness value.
2. The voltage compensation method of claim 1, wherein the voltage compensation coefficient further comprises a first voltage compensation coefficient, and the compensating the initial power supply voltage and the initial gamma voltage corresponding to the initial display data according to the voltage compensation coefficient to obtain the compensated power supply voltage and the compensated gamma voltage corresponding to the initial display data comprises:
and compensating the initial power supply voltage and the first-stage initial gamma voltage of the initial gamma voltage according to the first voltage compensation coefficient to obtain the compensated power supply voltage and the first-stage compensated gamma voltage of the compensated gamma voltage.
3. The method of compensating for voltage according to claim 1, wherein compensating for an initial power supply voltage and an initial gamma voltage corresponding to the initial display data according to the voltage compensation coefficient to obtain the compensated power supply voltage and the compensated gamma voltage corresponding to the initial display data comprises:
and compensating the second-stage initial gamma voltage to the fourteenth-stage initial gamma voltage of the initial gamma voltage according to the second voltage compensation coefficient to obtain a second-stage compensation gamma voltage and a fourteenth-stage compensation gamma voltage of the compensation gamma voltage.
4. The voltage compensation method of claim 1, wherein the matching an initial power supply voltage and an initial gamma voltage corresponding to the initial display data according to the initial display data comprises:
determining the gray scale duty ratio of the image in the initial display data according to the initial display data;
and determining an initial power supply voltage and an initial gamma voltage corresponding to the display data according to the image gray scale duty ratio.
5. The method of voltage compensation according to claim 1, wherein said determining an image gray scale duty cycle in said initial display data from said initial display data comprises:
determining the number of images with the image gray-scale values of a preset target gray-scale value in the initial display data to obtain the number of target gray-scale images;
and calculating the duty ratio of the target gray-scale image quantity in the total image quantity of the initial display data to obtain the gray-scale duty ratio of the image.
6. A voltage compensation device, the device comprising:
the input module is used for acquiring initial display data of the display device and theoretical display brightness values corresponding to the initial display data;
the matching module is used for matching the initial power supply voltage and the initial gamma voltage corresponding to the initial display data according to the initial display data;
the determining module is used for determining an actual display brightness value corresponding to the display device according to the initial power supply voltage and the initial gamma voltage;
the compensation module is used for determining a brightness value difference value according to the theoretical display brightness value and the actual display brightness value;
the brightness value difference value is compared with a preset brightness difference threshold value to obtain a brightness difference comparison result;
the brightness difference comparison result comprises that the brightness value difference value is larger than or equal to the brightness difference threshold value and the brightness value difference value is smaller than the brightness difference threshold value;
when the brightness difference comparison result is that the brightness value difference is greater than or equal to the brightness difference threshold value, determining that a second voltage compensation coefficient in the voltage compensation coefficients is a coefficient with a value less than or equal to 1, wherein the second voltage compensation coefficient is used for compensating the second-stage gamma voltage to the fourteenth-stage gamma voltage of the initial gamma voltage;
when the brightness difference comparison result is that the brightness value difference is smaller than the brightness difference threshold value, determining that the second voltage compensation coefficient is a coefficient with a value larger than 1;
the compensation module is used for compensating the initial power supply voltage and the initial gamma voltage corresponding to the initial display data according to the voltage compensation coefficient to obtain the compensation power supply voltage and the compensation gamma voltage corresponding to the initial display data;
and the display module is used for inputting the compensation power supply voltage and the compensation gamma voltage to a display device to obtain target display brightness, wherein the target display brightness is the same as the theoretical display brightness corresponding to the theoretical display brightness value.
7. A display device, characterized in that the display device employs the voltage compensation method according to any one of claims 1 to 5 or the voltage compensation apparatus according to claim 6.
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