CN114639342A - Display panel brightness control method and device, display equipment and electronic equipment - Google Patents
Display panel brightness control method and device, display equipment and electronic equipment 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]
- G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
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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
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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
- 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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- 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 disclosure relates to a brightness control method and device for a display panel, a display device and an electronic device, wherein the method comprises the following steps: determining the duty ratio of a dimming signal corresponding to a first display brightness value under the condition that the display panel starts a fingerprint identification mode; under the condition that the duty ratio of the dimming signal corresponding to the first display brightness value is smaller than a preset duty ratio, determining a compensated gray-scale value of each background pixel point in the display panel according to the difference value between the first display brightness value and the preset brightness value; and changing the gray scale value of each background pixel point into the compensated gray scale value. The brightness control method of the display panel can ensure that the brightness of the background picture displayed by the display panel before and after the fingerprint identification mode is started is kept unchanged, and further improves the display effect of the display panel.
Description
Technical Field
The present disclosure relates to the field of display panels, and in particular, to a brightness control method and apparatus for a display panel, a display device, and an electronic device.
Background
In the prior art, when the display panel adjusts the brightness of the display panel by using a PWM dimming signal (i.e., a pulse width modulation signal) dimming technique, if the fingerprint identification mode of the display panel is turned on under the condition that the duty ratio of the PWM dimming signal is less than 100%, the duty ratio of the PWM dimming signal is rapidly increased to 100%. However, when the duty ratio of the PWM dimming signal increases to 100%, the gamma dimming signal in the display panel is not changed, which is equivalent to that the gray level of each pixel point in the display panel for displaying the background picture is not changed, so that the overall brightness of the display panel increases, and the brightness of the background picture of the display panel changes before and after the fingerprint identification mode of the display panel is turned on, thereby reducing the display effect of the display panel.
In view of the above, it is desirable to provide a method for controlling brightness of a display panel to solve the problem of inconsistent brightness before and after the fingerprint recognition mode of the display panel is turned on.
Disclosure of Invention
In view of this, the present disclosure provides a method and an apparatus for controlling brightness of a display panel, a display device, and an electronic device.
According to an aspect of the present disclosure, there is provided a luminance control method of a display panel, the method including: under the condition that the display panel starts a fingerprint identification mode, determining the duty ratio of a dimming signal corresponding to a first display brightness value; the first display brightness value is a brightness value of the display panel before a fingerprint identification mode is started, and the dimming signal is a pulse width modulation dimming signal in the display panel; under the condition that the duty ratio of the dimming signal corresponding to the first display brightness value is smaller than a preset duty ratio, determining a compensated gray-scale value of each background pixel point in the display panel according to the difference value between the first display brightness value and the preset brightness value; the background pixel points are pixel points in a non-fingerprint identification area in the display panel; and changing the gray scale value of each background pixel point into the compensated gray scale value.
In a possible implementation manner, the compensated gray scale value of the background pixel is smaller than the original gray scale value of the background pixel, and the original gray scale value of the background pixel is the gray scale value of the background pixel when the display brightness of the display panel is the preset brightness value.
In a possible embodiment, before determining the duty ratio of the dimming signal corresponding to the first display brightness value when the display panel is in the fingerprint identification mode, the method further includes: determining a difference value between the current brightness value of the display panel and the preset brightness value according to the current brightness value of the display panel; determining gray scale voltage according to the difference value between the current brightness value and the preset brightness value; and correcting the current brightness value of the display panel to the preset brightness value according to the gray scale voltage.
In a possible implementation manner, the determining, according to a difference between the first display luminance value and a preset luminance value, a compensated gray scale value of each background pixel in the display panel includes: determining a compensation brightness value according to the difference value between the first display brightness value and the preset brightness value; determining a compensated gray-scale value of each background pixel point in the display panel according to the compensation brightness value and the dimming curve corresponding to the display panel; the dimming curve is used for representing a mapping relation between the brightness value and the gray-scale value.
In a possible implementation manner, the determining, according to a difference between the first display luminance value and a preset luminance value, a compensated gray scale value of each background pixel in the display panel includes: determining a compensation brightness value according to the difference value between the first display brightness value and the preset brightness value; determining a gray scale compensation coefficient of the background pixel point according to a compensation coefficient lookup table and the compensation brightness value; the compensation coefficient lookup table comprises a plurality of compensation coefficient lookup groups, each compensation coefficient lookup group comprises gray scale compensation coefficients with the same original gray scale value corresponding to a plurality of different compensation brightness values, and the original gray scale values in different compensation coefficient groups are different; determining a compensated gray scale value of the background pixel point according to the gray scale compensation coefficient of the background pixel point and the original gray scale value of the background pixel point; wherein the compensated gray scale value is positively correlated with the original gray scale value and the gray scale compensation coefficient.
In one possible embodiment, the method further comprises: respectively determining a plurality of different compensation brightness values and compensated gray scale values corresponding to the same original gray scale value to generate a compensation gray scale initial group; wherein the compensation gray scale initial group comprises a plurality of different compensated gray scale values; determining a compensation coefficient initial group according to the compensation gray scale initial group and the original gray scale value; the compensation coefficient initial group comprises a ratio of each compensated gray scale value in the compensation gray scale initial group to the original gray scale value; and generating a compensation coefficient search group corresponding to the original gray-scale value according to the compensation coefficient initial group.
In one possible embodiment, the method further comprises: and under the condition that the duty ratio of the dimming signal corresponding to the first display brightness value is equal to the preset duty ratio, maintaining the gray-scale value of each background pixel point in the display panel after the display panel starts a fingerprint identification mode.
In one possible embodiment, the preset duty cycle is 100%.
In a possible embodiment, the preset brightness value is a minimum brightness value of the display panel when a duty ratio of a pwm dimming signal in the display panel reaches 100%.
According to another aspect of the present disclosure, there is also provided a luminance control apparatus of a display panel, the apparatus including:
the original dimming signal determining module is configured to determine the duty ratio of a dimming signal corresponding to a first display brightness value under the condition that the display panel starts a fingerprint identification mode; the first display brightness value is a brightness value of the display panel before a fingerprint identification mode is started, and the dimming signal is a pulse width modulation dimming signal in the display panel; the compensation gray scale value determining module is configured to determine a compensated gray scale value of each background pixel point in the display panel according to a difference value between the first display brightness value and a preset brightness value under the condition that a duty ratio of a dimming signal corresponding to the first display brightness value is smaller than a preset duty ratio; the background pixel points are pixel points in a non-fingerprint identification area in the display panel; and the original gray-scale value changing module is configured to change the gray-scale value of each background pixel point into the compensated gray-scale value.
According to another aspect of the present disclosure, there is also provided a display apparatus including a plurality of display units and at least one brightness control device according to the foregoing.
In one possible embodiment, the display unit includes a display panel including at least one of a liquid crystal display panel, a micro-light emitting diode display panel, a mini-light emitting diode display panel, a quantum dot light emitting diode display panel, an organic light emitting diode display panel, a cathode ray tube display panel, a digital light processing display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, an electrowetting display panel, and a small pitch display panel.
According to another aspect of the present disclosure, there is also provided an electronic device including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to implement the method of any one of the preceding claims when executing the instructions stored by the memory.
According to another aspect of the present disclosure, there is also provided a non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the method of any one of the preceding.
According to the brightness control method of the display panel, under the condition that the fingerprint identification mode of the display panel is started, the gray-scale value of each pixel point (namely the background pixel point) in the background picture displayed by the display panel is adjusted, and the brightness change value of the display panel caused by the rise of the duty ratio of the PWM dimming signal is compensated, so that the display brightness of the background picture of the display panel before and after the fingerprint identification mode is started is kept unchanged, and the display effect of the display panel is further improved.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a flowchart of a brightness control method according to an embodiment of the disclosure.
Fig. 2 is a graph illustrating a relationship between a duty ratio of a dimming signal and a change of a brightness value according to an embodiment of the disclosure.
Fig. 3 is a flowchart of a brightness control method according to an embodiment of the disclosure.
Fig. 4 is a schematic diagram of a gamma dimming curve according to an embodiment of the disclosure.
Fig. 5 is a flowchart of a brightness control method according to an embodiment of the disclosure.
Fig. 6 is a schematic diagram of a compensation coefficient lookup table according to an embodiment of the disclosure.
Fig. 7 is a schematic structural diagram of a luminance control apparatus according to an embodiment of the disclosure.
Fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
To facilitate an understanding of the following, some terms and concepts are described herein as exemplary. In the field of brightness adjustment of display panels, a brightness value of a display panel may be determined according to a duty ratio of a PWM dimming signal (hereinafter, a dimming signal) and a gray scale value of each output pixel of the display panel (i.e., each pixel in an image displayed by the display panel), and a gray scale value of each output pixel may be determined according to a gray scale value of an input pixel (i.e., each pixel in an image input to the display panel). For example: if the gray level of the input pixel A is H1, the gray level H2 of the output pixel A' corresponding to the input pixel A can be determined according to the gray level H1. Wherein H1 is in positive correlation with H2. In other words, the larger the gray scale value of the input pixel is, the larger the gray scale value of the corresponding output pixel is.
Illustratively, the brightness value of the display panel is positively correlated with the duty ratio of the PWM dimming signal and the gray-scale value of the output pixel. The actual gray scale value of the output pixel point is controlled by the gray scale voltage corresponding to the pixel point, the gray scale voltage corresponding to the output pixel point is positively correlated with the gray scale value of the output pixel point, and optionally, the gray scale voltage is generated by a gray scale voltage generation circuit of a source electrode driving chip in the display panel. As can be seen from the dimming curve (as shown in fig. 4), the gray scale value of the pixel point is positively correlated with the corresponding brightness value, which is equivalent to that the gray scale voltage corresponding to the output pixel point is positively correlated with the brightness value. The horizontal axis of the dimming curve represents a gray scale value, the vertical axis represents a brightness value, and the dimming curve is used for representing the corresponding relation between the gray scale value and the brightness value.
In summary, the purpose of adjusting the brightness value of the display panel can be achieved by adjusting the duty ratio of the PWM dimming signal in the display panel and outputting the gray-scale voltage corresponding to the pixel point. Under the condition that the duty ratio of the PWM dimming signal in the display panel is fixed, the aim of adjusting the brightness value of the display panel can be achieved by adjusting the voltage value of the gray scale voltage corresponding to the output pixel point. Under the condition that the gray scale voltage corresponding to the output pixel point in the display panel is not changed, the purpose of adjusting the brightness value of the display panel can be realized by adjusting the duty ratio of the PWM dimming signal.
Referring to fig. 1, the present disclosure provides a brightness control method of a display panel, including: step S100-step S300.
In step S100, when the display panel starts the fingerprint identification mode, a duty ratio of the dimming signal corresponding to the first display brightness value is determined.
For example, the first display brightness value is a brightness value before the display panel starts the fingerprint identification mode, and the dimming signal is a pulse width modulation dimming signal (i.e., a PWM dimming signal) in the display panel. For example: before the display panel starts the fingerprint identification mode, the brightness value of the display panel is 255, the duty ratio of the pulse width modulation dimming signal at this time is 80%, the first display brightness value is 255, and the duty ratio of the corresponding dimming signal is 80%. In other words, the duty ratio of the dimming signal corresponding to the first display brightness value is the duty ratio of the pulse width modulation dimming signal (i.e., the PWM dimming signal) in the display panel before the display panel starts the fingerprint identification mode. The PWM dimming signal (i.e., the PWM dimming signal) is used to adjust a current brightness value of the display panel, and when a gray scale value of each pixel point (i.e., the background pixel point) of a background picture displayed by the display panel is not changed, a duty ratio of the PWM dimming signal is increased, the current brightness value of the display panel is also increased, and when the duty ratio of the PWM dimming signal is decreased, the current brightness value of the display panel is also decreased, that is, as described above, the current brightness value of the display panel is in positive correlation with the duty ratio of the PWM dimming signal.
In step S200, when the duty ratio of the dimming signal corresponding to the first display luminance value is smaller than the preset duty ratio, the compensated gray-scale value of each background pixel point in the display panel is determined according to the difference between the first display luminance value and the preset luminance value.
Illustratively, the background pixel is a pixel in a non-fingerprint identification area of the display panel. In other words, when the fingerprint recognition mode is turned on, the background pixel is a pixel for displaying a background image.
Illustratively, the preset duty cycle is 100%. The preset duty ratio may also be other values, and may be determined according to the actual condition of the display panel.
For example, referring to fig. 2, in a case that the preset duty ratio is 100%, in order to ensure that when the duty ratio of the PWM dimming signal (i.e. the PWM dimming signal) in the display panel reaches the preset duty ratio, a background image displayed by the display panel does not have color cast, etc., the preset brightness value is a minimum brightness value of the display panel when the duty ratio of the PWM dimming signal in the display panel reaches 100%. In other words, in the case that the maximum brightness value of the display panel is 2047, the preset brightness value may be the brightness value corresponding to the point a in fig. 2. Optionally, the preset brightness value may also be a brightness value larger than the brightness value corresponding to the point a, which is not limited in this disclosure.
Referring to fig. 3, in one possible implementation, step S200 includes: step S210-step S220.
In step S210, a compensation brightness value is determined according to a difference between the first display brightness value and a preset brightness value.
For example, the first display brightness value may be determined according to the brightness value of the display panel before the fingerprint recognition mode is turned on. The preset brightness value may be determined according to the brightness value when the display panel starts the fingerprint identification mode, or may be determined according to the selection rule of the preset brightness value in step 200, that is, the preset brightness value is the minimum brightness value of the display panel when the duty ratio of the pwm dimming signal in the display panel reaches 100%. The compensation brightness value is equal to the difference value between the preset brightness value and the first display brightness value.
For example, before the display panel starts the fingerprint recognition mode, the brightness value of the display panel is 245, and then the first display brightness value is 245. After the fingerprint identification mode is started, the brightness value of the display panel is 255, and then the preset brightness value is 255. Since the compensation brightness value is equal to the difference between the preset brightness value and the first display brightness value, the compensation brightness value is 10.
In step S220, a compensated gray scale value of each background pixel in the display panel is determined according to the compensation brightness value and the dimming curve corresponding to the display panel.
For example, according to the compensation brightness value calculated in step S210 and the dimming curve corresponding to the display panel, a compensated gray-scale value corresponding to the original gray-scale value (which is equivalent to the gray-scale value of the background pixel point when the brightness of the display panel is the preset brightness value) is determined. When the preset brightness value is known, the gray scale value corresponding to the preset brightness value can be determined according to the dimming curve as the original gray scale value, and the difference between the brightness value corresponding to the original gray scale value in the dimming curve and the brightness value corresponding to the compensated gray scale value in the dimming curve is equal to the compensation brightness value.
For example, referring to fig. 4, fig. 4 is a gamma dimming curve, wherein the horizontal axis represents gray scale values and the vertical axis represents brightness values. When the compensation brightness value is 10, if the original gray scale value of the background pixel is 54, the brightness value (i.e. 10) corresponding to the compensated gray scale value is determined according to the difference between the brightness value (i.e. 20) corresponding to the original gray scale value and the compensation brightness value (i.e. 10), and then the compensated gray scale value (i.e. 40) is determined according to the gamma dimming curve.
In one possible implementation, referring to fig. 5, step S200 further includes: step S240-step S260.
In step S240, a compensation brightness value is determined according to a difference between the first display brightness value and a preset brightness value.
Illustratively, the compensation brightness value is equal to a difference between the preset brightness value and the first display brightness value. For example: in the case that the first brightness value is 245 and the preset brightness value is 255, the compensation brightness value is 10.
In step S250, a gray-scale compensation coefficient of the background pixel point is determined according to the compensation coefficient lookup table and the compensation brightness value.
Illustratively, the compensation coefficient lookup table includes a plurality of compensation coefficient lookup groups, each of the compensation coefficient lookup groups includes gray scale compensation coefficients having the same original gray scale value and corresponding to a plurality of different compensation brightness values, and the original gray scale values in different compensation coefficient groups are different. For example: as shown in fig. 6, the compensation coefficient lookup table includes a compensation coefficient lookup group a, a compensation coefficient lookup group B, and a compensation coefficient lookup group C. Wherein, M1 to M3 are compensation brightness values, X1 to X9 are gray scale compensation coefficients, and the gray scale compensation coefficients can be values larger than 0 and smaller than 1. The compensation coefficient search group a includes gray compensation coefficients (i.e., X1 to X3) corresponding to the compensation luminance values M1 to M3, respectively, when the original gray value is D1. The compensation coefficient search group B includes gray compensation coefficients (i.e., X4 to X6) corresponding to the compensation luminance values M1 to M3, respectively, when the original gray value is D2. The compensation coefficient search group C includes gray compensation coefficients (i.e., X7 to X9) corresponding to the compensation luminance values M1 to M3, respectively, when the original gray value is D3.
Illustratively, the compensation coefficient lookup group in the compensation coefficient lookup table may be generated by a method comprising: and respectively determining a plurality of different compensation brightness values and compensated gray scale values corresponding to the same original gray scale value to generate a compensation gray scale initial group. The compensation gray scale initial group comprises a plurality of different compensated gray scale values. And determining the compensation coefficient initial group according to the compensation gray scale initial group and the original gray scale value. The compensation coefficient initial group comprises ratios of each compensated gray scale value in the compensation gray scale initial group to the original gray scale value. And generating a compensation coefficient search group corresponding to the original gray-scale value according to the compensation coefficient initial group.
For example, taking the generation process of the compensation coefficient search set a in fig. 6 as an example, when the compensation coefficient search set a includes the original gray-scale value D1, the compensation luminance values M1 to M3 respectively correspond to gray-scale compensation coefficients (i.e., X1 to X3). Under the condition that the original gray-scale value of the background pixel point is determined to be D1, a compensated gray-scale value N1 corresponding to the compensation brightness value M1 and a compensated gray-scale value N3 corresponding to the compensation brightness value M3 are determined, and a compensation gray-scale initial group is generated, wherein the compensation gray-scale initial group comprises N1 and N3. The ratio of each compensated gray scale value to the original gray scale value in the initial set of compensated gray scales, i.e., N1/M1 and N3/M1, is calculated to generate an initial set of compensation coefficients, which includes X1 (i.e., N1/M1) and X3 (i.e., N3/M1). According to the compensation coefficient initial group, when the compensation brightness value is M2, the gray scale compensation coefficient X2 (namely N2/M2) corresponding to the original gray scale value D1 is determined by a linear interpolation method, and then a complete compensation coefficient search group A is established.
In step S260, a compensated gray scale value of the background pixel is determined according to the gray scale compensation coefficient of the background pixel and the original gray scale value of the background pixel.
Illustratively, the compensated gray scale value is positively correlated with the original gray scale value and the gray scale compensation coefficient.
Illustratively, the compensated gray scale value is equal to the product of the original gray scale value and the gray scale compensation coefficient. For example: when the original gray scale value is D1 and the gray scale compensation factor is X1, the compensated gray scale value is equal to X1 × D1.
In step S300, the gray-scale value of each background pixel is changed to the compensated gray-scale value.
Illustratively, if the compensated gray scale value of the background pixel is 40, the gray scale value of the background pixel is 40 when the display panel starts the fingerprint identification mode.
In one possible implementation, the compensated gray scale value of the background pixel is smaller than the original gray scale value.
In the brightness control method of the display panel provided by the disclosure, since the compensated gray scale value of the background pixel point is smaller than the original gray scale value, it can be known from the dimming curve that the brightness value corresponding to the compensated gray scale value is also smaller than the brightness value corresponding to the original gray scale value, therefore, under the condition that the brightness value of the display panel is at the preset brightness value, the display panel can reduce the gray scale value of each pixel point (i.e., the background pixel point) in the background picture to the corresponding compensated gray scale value, and further reduce the brightness value of the display panel to the first display brightness value, so that the brightness value does not change before and after the display panel is started in the fingerprint identification mode, and further improve the display effect of the display panel.
In a possible embodiment, before determining the duty ratio of the dimming signal corresponding to the first display brightness value when the display panel is in the fingerprint identification mode, the brightness control method of the display panel further includes: and determining the difference value between the current brightness value of the display panel and a preset brightness value according to the current brightness value of the display panel. And determining the gray scale voltage according to the difference value between the current brightness value and the preset brightness value. And correcting the current brightness value of the display panel to be a preset brightness value according to the gray scale voltage.
Illustratively, under the condition that the display panel starts the fingerprint identification mode, the current brightness value of the display panel is 300, and the preset brightness value is 255, that is, the current brightness value of the display panel is greater than the preset brightness value, in order to ensure that the display problems such as color cast and the like do not occur in the display panel, the gray level value of each pixel point (that is, a background pixel point) in a background picture displayed by the display panel needs to be reduced, so that the brightness value of the background picture is reduced. According to the difference value between the current brightness value and the preset brightness value, namely 45, of the display panel, the current output voltage of the gray scale voltage generation circuit of the source driver chip in the display panel, namely the above gray scale voltage, is determined. And correcting the brightness of the display panel according to the gray scale voltage. The pixel array circuit in the display panel adjusts the gray scale value of the background pixel point according to the gray scale voltage, so as to achieve the purpose of fixing the current brightness value of the display panel on the preset brightness value (here, see the content in step S220 as well). The process of determining the current output voltage of the gray scale voltage generation circuit of the source driver chip in the display panel according to the difference may refer to related technologies, which are not described herein in detail in this disclosure.
Thereafter, steps S100 to S300 may be continued.
For example, in a case that the display panel turns on the fingerprint recognition mode, the current brightness value of the display panel is 250, and the preset brightness value is 255, that is, in a case that the current brightness value of the display panel is smaller than the preset brightness value. The brightness value of the display panel may also be fixed to the preset brightness value according to a difference between the current brightness value of the display panel and the preset brightness value, that is, 5. The steps herein are similar to the above (see the content in step S220, too), so that the present disclosure is not repeated herein.
According to the brightness control method of the display panel, under the condition that the fingerprint identification mode of the display panel is started, the gray-scale value of each pixel point (namely the background pixel point) in the background picture displayed by the display panel is adjusted, the brightness change value of the display panel caused by the rise of the duty ratio of the PWM dimming signal is compensated, so that the display brightness of the display panel before and after the fingerprint identification mode is started is kept unchanged, and the display effect of the display panel is improved.
In one possible implementation, the method for controlling the brightness of the display panel further includes: and under the condition that the duty ratio of the dimming signal corresponding to the first display brightness value is equal to the preset duty ratio, after the fingerprint identification mode of the display panel is started, maintaining the gray-scale value of each background pixel point in the display of the display panel.
For example, under the condition that the preset duty ratio is 100%, if the duty ratio corresponding to the first display brightness value has reached 100% before the fingerprint identification mode is started on the display panel, the gray-scale value of each background pixel point in the display of the display panel remains unchanged after the fingerprint identification mode is started on the display panel.
In one possible embodiment, referring to fig. 7, the present disclosure also provides a brightness control device 10 of a display panel, including: an original dimming signal determining module 11, a compensation gray-scale value determining module 12, and an original gray-scale value changing module 13.
Illustratively, the original dimming signal determination module 11 is configured to determine the duty ratio of the dimming signal corresponding to the first display brightness value when the display panel is turned on in the fingerprint identification mode. The first display brightness value is a brightness value of the display panel before the fingerprint identification mode is started, and the dimming signal is a pulse width modulation dimming signal in the display panel.
Illustratively, the compensation gray-scale value determining module 12 is configured to determine a compensated gray-scale value of each background pixel point in the display panel according to a difference between the first display brightness value and a preset brightness value when a duty ratio of the dimming signal corresponding to the first display brightness value is smaller than the preset duty ratio. The background pixel points are pixel points in a non-fingerprint identification area in the display panel.
Illustratively, the original gray-scale value modification module 13 is configured to modify the gray-scale value of each background pixel point to the compensated gray-scale value.
In a possible implementation manner, functions of the apparatus provided in the embodiment of the present disclosure or modules included in the apparatus may be used to execute the method described in the above method embodiment, and specific implementation thereof may refer to the description of the above method embodiment, and for brevity, details are not described here again.
The utility model provides a display panel's brightness control device, it can be under the display panel opens the condition of fingerprint identification mode, through the grey scale value of adjusting each background pixel in the display panel, compensate the display panel and rise the luminance variation value that produces because of the duty cycle of PWM light modulation signal to the realization guarantees that display panel keeps unchangeable at the display brightness who opens before and after the fingerprint identification mode, and then promotes display panel's display effect.
In a possible implementation manner, the present disclosure further provides a display apparatus including a plurality of display units and at least one brightness control device according to the foregoing description.
Illustratively, the display unit includes a display panel including at least one of a liquid crystal display panel, a micro-light emitting diode display panel, a mini-light emitting diode display panel, a quantum dot light emitting diode display panel, an organic light emitting diode display panel, a cathode ray tube display panel, a digital light processing display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, an electrowetting display panel, and a small pitch display panel.
In a possible embodiment, the present disclosure further provides a driving chip including the luminance controlling apparatus according to the foregoing.
Illustratively, the at least one reset signal internal to the chip includes, but is not limited to, at least one of a power-on reset signal, a software reset signal, an ESD reset signal, a watchdog reset signal, and an abnormal power-down reset signal.
It should be noted that the chip reset circuit provided in the embodiment of the present invention is not limited to be disposed only in the chip of the electronic device shown in fig. 8, and may be integrated in any chip having a reset function to implement the reset function of the internal circuit of the chip. The invention is not limited in this regard.
It is worth noting that the driving chip according to the embodiment of the present disclosure can be formed as a general driving chip, and can be suitable for display panels with different sub-pixel arrangements, so that the design cost and the manufacturing cost can be reduced.
Embodiments of the present disclosure also provide a computer-readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the above-described method (i.e., the brightness control method). The computer readable storage medium may be a volatile or non-volatile computer readable storage medium.
It is noted that the processor herein may be a single processor or a combination of multiple processing elements, for example, the processor may be a CPU or one or more integrated circuits configured to implement the above brightness control method.
In one possible implementation, the Processor may be a general purpose Processor, including but not limited to a Central Processing Unit (CPU), a Network Processor (NP), etc., a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein. Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (chips), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block or blocks.
An embodiment of the present disclosure further provides an electronic device, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to implement the above-described method when executing the memory-stored instructions.
For example, the electronic device in the present embodiment includes, but is not limited to, a desktop computer, a television, a mobile device with a large-sized screen, such as a mobile phone, a tablet computer, and other common electronic devices that require multiple chip-level connections to implement driving.
The electronic device may also be, for example, a User Equipment (UE), a mobile device, a User terminal, a handheld device, a computing device, or a vehicle-mounted device, and the like, and examples of some terminals include: a display, a Smart Phone or a portable device, a Mobile Phone (Mobile Phone), a tablet computer, a laptop computer, a palmtop computer, a Mobile Internet Device (MID), a wearable device, a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in Industrial Control (Industrial Control), a wireless terminal in unmanned driving (self), a wireless terminal in Remote Surgery (Remote medical Surgery), a wireless terminal in Smart Grid (Smart), a wireless terminal in Transportation Safety (Transportation Safety), a wireless terminal in Smart City (City), a wireless terminal in Smart Home (Smart Home), a wireless terminal in car networking, and the like. For example, the server may be a local server or a cloud server.
Embodiments of the present disclosure also provide a computer program product, which includes computer readable code or a non-volatile computer readable storage medium carrying computer readable code, when the computer readable code runs in a processor of an electronic device, the processor in the electronic device executes the above method.
Fig. 8 is a block diagram illustrating an electronic device 800 for a brightness control method of a display panel according to an exemplary embodiment. For example, the electronic device 800 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.
Referring to fig. 8, electronic device 800 may include one or more of the following components: a processing component 802, a memory 804, a power component 806, a multimedia component 808, an audio component 810, an input/output (I/O) interface 812, a sensor component 814, and a communication component 816.
The processing component 802 generally controls overall operation of the electronic device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.
The memory 804 is configured to store various types of data to support operations at the electronic device 800. Examples of such data include instructions for any application or method operating on the electronic device 800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
The power supply component 806 provides power to the various components of the electronic device 800. The power components 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the electronic device 800.
The multimedia component 808 includes a screen that provides an output interface between the electronic device 800 and a user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the electronic device 800 is in an operation mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.
The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the electronic device 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.
The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for the electronic device 800. For example, the sensor assembly 814 may detect an open/closed state of the electronic device 800, the relative positioning of components, such as a display and keypad of the electronic device 800, the sensor assembly 814 may also detect a change in the position of the electronic device 800 or a component of the electronic device 800, the presence or absence of user contact with the electronic device 800, orientation or acceleration/deceleration of the electronic device 800, and a change in the temperature of the electronic device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 816 is configured to facilitate wired or wireless communication between the electronic device 800 and other devices. The electronic device 800 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the electronic device 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic components for performing the above-described methods.
In an exemplary embodiment, a non-transitory computer-readable storage medium, such as the memory 804, is also provided that includes computer program instructions executable by the processor 820 of the electronic device 800 to perform the above-described methods.
The present disclosure may be systems, methods, and/or computer program products. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied thereon for causing a processor to implement various aspects of the present disclosure.
The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: 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), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or electrical signals transmitted through electrical wires.
The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.
The computer program instructions for carrying out operations of the present disclosure may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer-readable program instructions 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 type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the disclosure are implemented by personalizing an electronic circuit, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA), with state information of computer-readable program instructions, which can execute the computer-readable program instructions.
Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, electronic devices (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing electronic device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing electronic device, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing electronics, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing electronic device, or other apparatus to cause a series of operational steps to be performed on the computer, other programmable data processing electronic device, or other apparatus to produce a computer implemented process such that the instructions which execute on the computer, other programmable data processing electronic device, or other apparatus implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (14)
1. A method for controlling brightness of a display panel, the method comprising:
determining the duty ratio of a dimming signal corresponding to a first display brightness value under the condition that the display panel starts a fingerprint identification mode; the first display brightness value is a brightness value of the display panel before a fingerprint identification mode is started, and the dimming signal is a pulse width modulation dimming signal in the display panel;
under the condition that the duty ratio of the dimming signal corresponding to the first display brightness value is smaller than a preset duty ratio, determining a compensated gray-scale value of each background pixel point in the display panel according to the difference value between the first display brightness value and the preset brightness value; the background pixel points are pixel points in a non-fingerprint identification area in the display panel;
and changing the gray scale value of each background pixel point into the compensated gray scale value corresponding to the gray scale value.
2. The luminance control method of claim 1, wherein the compensated gray scale value of the background pixel is smaller than the original gray scale value of the background pixel, and the original gray scale value of the background pixel is the gray scale value of the background pixel when the display luminance of the display panel is the preset luminance value.
3. The method of claim 1, wherein before determining the duty cycle of the dimming signal corresponding to the first display brightness value when the display panel is in the fingerprint recognition mode, the method further comprises:
determining a difference value between the current brightness value of the display panel and the preset brightness value according to the current brightness value of the display panel;
determining gray scale voltage according to the difference value between the current brightness value and the preset brightness value;
and correcting the current brightness value of the display panel to the preset brightness value according to the gray scale voltage.
4. The method of claim 1, wherein determining the compensated gray scale value of each background pixel in the display panel according to the difference between the first display brightness value and a preset brightness value comprises:
determining a compensation brightness value according to the difference value between the first display brightness value and the preset brightness value;
determining a compensated gray-scale value of each background pixel point in the display panel according to the compensation brightness value and the dimming curve corresponding to the display panel; the dimming curve is used for representing a mapping relation between the brightness value and the gray-scale value.
5. The method of claim 1, wherein determining the compensated gray scale value of each background pixel in the display panel according to the difference between the first display brightness value and a preset brightness value comprises:
determining a compensation brightness value according to the difference value between the first display brightness value and the preset brightness value;
determining a gray scale compensation coefficient of the background pixel point according to a compensation coefficient lookup table and the compensation brightness value; the compensation coefficient lookup table comprises a plurality of compensation coefficient lookup groups, each compensation coefficient lookup group comprises gray scale compensation coefficients of which the same original gray scale value corresponds to a plurality of different compensation brightness values, and the original gray scale values in different compensation coefficient groups are different;
determining a compensated gray scale value of the background pixel point according to the gray scale compensation coefficient of the background pixel point and the original gray scale value of the background pixel point;
wherein the compensated gray scale value is positively correlated with the original gray scale value and the gray scale compensation coefficient.
6. The method of claim 5, further comprising:
respectively determining a plurality of different compensation brightness values and compensated gray scale values corresponding to the same original gray scale value to generate a compensation gray scale initial group; wherein the compensation gray scale initial group comprises a plurality of different compensated gray scale values;
determining a compensation coefficient initial group according to the compensation gray scale initial group and the original gray scale value; the compensation coefficient initial group comprises a ratio of each compensated gray scale value in the compensation gray scale initial group to the original gray scale value;
and generating a compensation coefficient searching set corresponding to the original gray-scale value according to the compensation coefficient initial set.
7. The method of claim 1, further comprising: and under the condition that the duty ratio of the dimming signal corresponding to the first display brightness value is equal to the preset duty ratio, after the display panel starts a fingerprint identification mode, keeping the gray-scale value of each background pixel point in the display panel.
8. The method of claim 1, wherein the preset duty cycle is 100%.
9. The method of claim 1, wherein the preset brightness value is a minimum brightness value of the display panel when a duty cycle of a PWM dimming signal in the display panel reaches 100%.
10. A luminance control apparatus of a display panel, the apparatus comprising:
the original dimming signal determination module is configured to determine a duty ratio of a dimming signal corresponding to a first display brightness value under the condition that the display panel is in the fingerprint identification mode; the first display brightness value is a brightness value of the display panel before a fingerprint identification mode is started, and the dimming signal is a pulse width modulation dimming signal in the display panel;
a compensation gray scale value determining module configured to determine a compensated gray scale value of each background pixel point in the display panel according to a difference between the first display brightness value and a preset brightness value when a duty ratio of a dimming signal corresponding to the first display brightness value is smaller than a preset duty ratio; the background pixel points are pixel points in a non-fingerprint identification area in the display panel;
and the original gray-scale value changing module is configured to change the gray-scale value of each background pixel point into the compensated gray-scale value.
11. A display apparatus comprising a plurality of display units and at least one brightness control device according to claim 10.
12. The display device of claim 11, wherein the display unit comprises a display panel comprising at least one of a liquid crystal display panel, a micro-light emitting diode display panel, a mini-light emitting diode display panel, a quantum dot light emitting diode display panel, an organic light emitting diode display panel, a cathode ray tube display panel, a digital light processing display panel, a field emission display panel, a plasma display panel, an electrophoretic display panel, an electrowetting display panel, and a small pitch display panel.
13. An electronic device, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to implement the method of any one of claims 1 to 9 when executing the memory-stored instructions.
14. A non-transitory computer readable storage medium having stored thereon computer program instructions, wherein the computer program instructions, when executed by a processor, implement the method of any one of claims 1 to 9.
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