CN112667188A - Display brightness control method, device, system, electronic terminal and readable storage medium - Google Patents
Display brightness control method, device, system, electronic terminal and readable storage medium Download PDFInfo
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- CN112667188A CN112667188A CN202011581393.1A CN202011581393A CN112667188A CN 112667188 A CN112667188 A CN 112667188A CN 202011581393 A CN202011581393 A CN 202011581393A CN 112667188 A CN112667188 A CN 112667188A
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Abstract
The invention discloses a display brightness control method, a device, a system, an electronic terminal and a readable storage medium, wherein the brightness control method comprises the following steps: step 1: acquiring brightness adjustment requirements of a display, wherein the brightness adjustment requirements at least comprise a brightness level and a corresponding brightness adjustable range; step 2: respectively acquiring duty ratios corresponding to the two measuring points under the condition of meeting a preset brightness error based on the brightness adjustable range; and step 3: generating a linear mapping relation table of the brightness level and the duty ratio based on the duty ratios corresponding to the two measuring points; and determining the duty ratio corresponding to the brightness level required by the display based on the linear mapping relation table. The duty ratio under each brightness can be rapidly determined based on the linear mapping relation table obtained by the invention, so that the brightness adjusting efficiency of the display is improved.
Description
Technical Field
The invention belongs to the technical field of displays, and particularly relates to a display brightness control method, device, system, electronic terminal and readable storage medium.
Background
The LCD brightness is composed of a backlight lamp group and a backlight driver, and after a PWM signal for controlling the brightness externally enters a backlight driver board circuit, the PWM signal with a corresponding period and a corresponding pulse width is output, so that the brightness of the display can be adjusted. The general display brightness level is adjustable from 1 to 100, and the corresponding brightness requirement is 0.2cd/m2-600cd/m2. I.e. the luminance level set by the user to level 1 corresponds to a luminance of 2cd/m2100 levels correspond to a luminance of 600cd/m2. Generally, the PWM frequency affects the fineness of the brightness, and the lower the frequency, the finer the brightness control. The duty ratio directly affects the brightness, so the corresponding relationship between the duty ratio and the brightness of the display needs to be tested.
Disclosure of Invention
The invention aims to provide a display brightness control method, a display brightness control device, a display brightness control system, an electronic terminal and a readable storage medium.
The invention provides a display brightness control method, which comprises the following steps:
step 1: acquiring brightness adjustment requirements of a display, wherein the brightness adjustment requirements at least comprise a brightness level and a corresponding brightness adjustable range;
step 2: respectively acquiring duty ratios corresponding to two measuring points meeting a preset brightness error based on the brightness adjustable range, wherein the two measuring points are two brightnesses selected from the brightness adjustable range;
and step 3: generating a linear mapping relation table of the brightness level and the duty ratio based on the duty ratios corresponding to the two measuring points;
and determining the duty ratio corresponding to the brightness level required by the display based on the linear mapping relation table.
It should be noted that, when the display brightness control method is applied to an electronic terminal, a linear mapping relation table is generated according to the contents of step 1 and step 3, and then the linear mapping relation table is transmitted to an image board of a display, so that in practical application, the image board determines a duty ratio corresponding to a brightness level required by the display based on the linear mapping relation table, and further outputs the corresponding duty ratio.
When the display brightness control method is applied to an image board, the display brightness control method receives a linear mapping relation table generated by an electronic terminal, determines the duty ratio corresponding to the brightness grade required by the display based on the linear mapping relation table, and further outputs the corresponding duty ratio. Wherein, the linear mapping relation table is obtained by the electronic terminal according to the modes of the steps 1 to 3.
Optionally, the two measuring points are the minimum brightness and the maximum brightness in the brightness adjustable range.
Optionally, when the brightness adjustment requirement includes a plurality of groups of brightness levels and brightness adjustable ranges corresponding to the brightness levels, duty ratios corresponding to two measuring points in each group of brightness adjustable ranges are obtained according to the step 2, linear mapping relations between each group of brightness levels and the duty ratios are respectively generated, and a linear mapping relation table of the whole brightness levels is obtained through combination. The invention carries out multi-group segmentation on the brightness levels and respectively processes the brightness levels, so that the obtained linear mapping relation table is more precise, more accords with the actual requirement and has smaller error.
Optionally, when the linear mapping table of brightness level and duty ratio of one display is adjusted and applied to a homogeneous display, the method further comprises:
based on the obtained linear mapping relation table, respectively searching the duty ratios corresponding to the two measuring points in the brightness adjustable range as central positions, and determining the duty ratios corresponding to the two measuring points of the current display under the condition of meeting a preset brightness error;
and searching the duty ratios of the two measuring points of the current display in a mode of increasing the duty ratio and decreasing the duty ratio when the duty ratio center points of the two measuring points are searched respectively.
Debugging to complete one displayAfter the software is solidified and is written into the same type of machine, the brightness error may be very large, which is often that the brightness is not consistent under the same current condition due to the difference of the hardware, so that the requirements of maximum and minimum brightness error control within 10% may not be met, especially for the low-brightness scene, such as the minimum brightness requirement of 0.2cd/m2The error accuracy requires 10%, then the brightness of the level must be controlled at 0.2cd/m2Plus or minus 0.02. Therefore, in the existing application, the corresponding relation between the duty ratio and the current display brightness is often required to be measured again, the efficiency is low, and the experience of practical application is influenced. The method selects the measuring point as the central position under the determined mapping relation, searches in a certain range, and can more quickly determine the mapping table adapted to the similar type display.
Optionally, the preset brightness error is that an absolute value of an error between the actual brightness and the theoretical brightness is minimum or an error is less than 10%.
Optionally, if an error between the actual brightness and the theoretical brightness of the display exceeds the preset brightness error range, the method further includes: and adjusting the duty ratio until the error between the actual brightness and the theoretical brightness of the display is within the preset brightness error range.
In a second aspect, the present invention provides an apparatus based on the foregoing method, including: the electronic terminal is in communication connection with the brightness tester, the electronic terminal is in communication connection with an image board of the display, the brightness tester measures the actual brightness of the display, and the electronic terminal outputs a linear mapping relation table of the brightness grade and the duty ratio to the image board.
In a third aspect, the present invention provides a system based on the foregoing method, including: the system comprises an electronic terminal, a brightness tester and a display;
the electronic terminal is in communication connection with the brightness tester, the electronic terminal is in communication connection with an image board of the display, the brightness tester measures the actual brightness of the display, and the electronic terminal outputs a linear mapping relation table of the brightness grade and the duty ratio to the image board.
In a fourth aspect, the present invention provides an electronic terminal, including a processor and a memory, where the memory stores a computer program, and the processor calls the computer program to execute: the method for controlling the brightness of the display comprises the following steps.
In a fifth aspect, the present invention provides a readable storage medium storing a computer program, the computer program being called by a processor to execute: the method for controlling the brightness of the display comprises the following steps.
Advantageous effects
1. The display brightness control method provided by the invention obtains the linear mapping relation table of the duty ratio and the brightness grade in a software mode, and further can quickly obtain the corresponding duty ratio under any brightness grade based on the linear mapping relation table, thereby realizing the high-efficiency regulation of the brightness.
2. In a further preferred scheme provided by the invention, based on the constructed linear mapping relation table, aiming at the conditions of brightness attenuation and the like of the display, the mapping table which is matched with the actual condition of the display can be more quickly adjusted and determined; particularly, when the method is applied to other displays of the same type, the linear mapping relation table can be quickly and efficiently corrected to adapt to other displays of the same type based on the adjusted linear mapping relation table.
Drawings
Fig. 1 is a schematic diagram of a system architecture for adjusting the brightness of a display according to embodiment 1 of the present invention.
Fig. 2 is a schematic flow chart of a PC and an image board on a display according to embodiment 2 of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1:
as shown in fig. 1, the system for adjusting the brightness of a display provided by the present invention comprises: PC, display and luminance tester. The PC and the brightness tester acquire the actual brightness value of the display through a USB communication connection mode, and the PC and the display are in communication connection through an RS232 mode so as to access an image board of the display and establish communication on the image board.
Based on the system architecture, the PC can acquire the real-time brightness of the display and control the duty ratio output by the image panel, so that the minimum brightness and the duty ratio corresponding to the maximum brightness in the brightness adjustable range are searched.
It should be noted that the connection between the PC and the luminance tester and the connection between the PC and the display in this embodiment are only one implementation, and the invention is not limited thereto. And the selected measuring points are the maximum brightness and the minimum brightness, and in other feasible modes, a linear mapping relation table can be obtained by randomly selecting two measuring points, wherein the larger the distance between the two measuring points is, the better the distance is theoretically.
Example 2:
on the basis of embodiment 1, the present embodiment requests a display luminance adjustment apparatus, which includes a PC and a luminance tester. The two are connected through USB. The PC is in communication connection with the display in an RS232 mode so as to access the image board of the display and establish communication with the image board.
Example 3:
the invention provides a method for controlling the brightness of a display, which comprises the following steps:
step 1: and acquiring the brightness adjustment requirement of the display, wherein the brightness adjustment requirement at least comprises a brightness level and a corresponding brightness adjustable range.
Wherein, if the user requires the OSD key brightness adjustable ability of the display to be 1-100 grade, the brightness adjustable range is 0.2-600cd/m2。
Step 2: respectively acquiring the duty ratios corresponding to the minimum brightness and the maximum brightness under the condition of meeting the preset brightness error based on the brightness adjustable range;
for 0.2cd/m2Sending command through serial port tool to control PWM duty ratio output of image plate, collecting actual brightness value of display under current duty ratio, and controlling display at theoretical brightness value of 0.2cd/m2By comparison, the adjustment was repeated in this way to obtain a value of 0.2cd/m2The point with the minimum error of the magnitude absolute value five is recordedDuty cycle.
For 600cd/m20.2 cd/m2Sending a command through a serial port tool to control the PWM duty ratio output of the image panel, collecting the actual brightness value of the display under the current duty ratio, and controlling the display to be in the theoretical brightness value of 600cd/m2And comparing, repeatedly adjusting to obtain a point with the minimum error of five absolute values, and recording the current duty ratio.
And step 3: generating a linear mapping relation table of the brightness level and the duty ratio based on the duty ratio corresponding to the minimum brightness and the maximum brightness;
and determining the duty ratio corresponding to the brightness level required by the display based on the linear mapping relation table. The linear mapping relation table is loaded into the image board, and when a user sets the brightness level, the PWM duty ratio can be quickly determined based on the linear mapping relation table, so that the requirements of customers are met.
Specifically, the program of the PC and the image board is shown in fig. 2, wherein the PC continuously adjusts the actual brightness of the display to obtain a linear mapping relation table, and transmits the linear mapping relation table to the image board, and the image board sets the PWM setting duty ratio in response to a serial port instruction of the PC.
It should be noted that, in this embodiment, the duty ratio is determined based on the minimum absolute value error; in other feasible embodiments, if the requirement of the preset brightness error is controlled within 10%, a duty ratio range is obtained for each of the two endpoints, and then any one brightness level in the linear mapping table corresponds to a duty ratio range, and further in practical application, a duty ratio is arbitrarily selected to be adjusted in the corresponding duty ratio range according to the required brightness level.
Example 4:
what is required in example 3 is the brightness level: 1-100 grade, and the adjustable range of brightness is 0.2-600cd/m2. In practical application, if the user requires the OSD key brightness adjustable capability of the display to be 1-100 levels, the brightness of 1-20 levels requires 0.2-5cd/m brightness2Adjustable, 21-100 requirements 5-600cd/m2Is adjustable. The brightness levels are divided into two groups: brightness levels of 1-20 and 21-100.
Then adjusted to 0.2, 5cd/m respectively in the manner described in the previous example 32Corresponding duty cycle, and 5, 600cd/m2A corresponding duty cycle; and then respectively carrying out linear mapping to obtain two groups of mapping relations, and finally combining to obtain a linear mapping relation table of the whole brightness grade range.
Example 5:
on the basis of embodiment 3, when the linear mapping relation table of the brightness level and the duty ratio of one display is adjusted and applied to the similar type display, fine adjustment can be performed based on the previously adjusted linear mapping relation table to obtain the linear mapping relation table adapted to the current display. The process is as follows:
based on the obtained linear mapping relation table, the minimum brightness of 0.2cd/m in the brightness adjustable range is utilized2And a maximum luminance of 600cd/m2Respectively searching corresponding duty ratios as central positions, and determining the minimum brightness of 0.2cd/m of the current display under the condition of meeting the preset brightness error2And a maximum luminance of 600cd/m2A corresponding duty cycle;
wherein the maximum luminance is 600cd/m2And minimum luminance of 0.2cd/m2When searching for the center point of duty ratio, searching for the minimum brightness of 0.2cd/m of the current display in the manner of increasing duty ratio and decreasing duty ratio2And a maximum luminance of 600cd/m2The duty cycle of (c).
It should be noted that the brightness levels and selectable brightness ranges set in all the foregoing embodiments are examples of corresponding embodiments, and other selectable ranges and levels are all the protection contents of the present invention under the technical idea of the present invention.
In addition, the present invention also provides an electronic terminal, comprising a processor and a memory, wherein the memory stores a computer program, and the processor calls the computer program to execute: the method for controlling the brightness of the display comprises the following steps.
Such as the PC described in fig. 1.
The invention provides a readable storage medium storing a computer program, the computer program being invoked by a processor to perform: the method for controlling the brightness of the display comprises the following steps.
For the specific implementation process of each step, please refer to the foregoing method, which is not described herein again.
It should be understood that in the embodiments of the present invention, the Processor may be a Central Processing Unit (CPU), and the Processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The memory may include both read-only memory and random access memory, and provides instructions and data to the processor. The portion of memory may also include non-volatile random access memory. For example, the memory may also store device type information.
The readable storage medium is a computer readable storage medium, which may be an internal storage unit of the controller according to any of the foregoing embodiments, for example, a hard disk or a memory of the controller. The readable storage medium may also be an external storage device of the controller, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the controller. Further, the readable storage medium may also include both an internal storage unit of the controller and an external storage device. The readable storage medium is used for storing the computer program and other programs and data required by the controller. The readable storage medium may also be used to temporarily store data that has been output or is to be output.
Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned readable storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
It should be emphasized that the examples described herein are illustrative and not restrictive, and thus the invention is not to be limited to the examples described herein, but rather to other embodiments that may be devised by those skilled in the art based on the teachings herein, and that various modifications, alterations, and substitutions are possible without departing from the spirit and scope of the present invention.
Claims (10)
1. A method for controlling the brightness of a display is characterized in that: the method comprises the following steps:
step 1: acquiring brightness adjustment requirements of a display, wherein the brightness adjustment requirements at least comprise a brightness level and a corresponding brightness adjustable range;
step 2: respectively acquiring duty ratios corresponding to two measuring points meeting a preset brightness error based on the brightness adjustable range, wherein the two measuring points are two brightnesses selected from the brightness adjustable range;
and step 3: generating a linear mapping relation table of the brightness level and the duty ratio based on the duty ratios corresponding to the two measuring points;
and determining the duty ratio corresponding to the brightness level required by the display based on the linear mapping relation table.
2. The method of claim 1, wherein: and the two measuring points are the minimum brightness and the maximum brightness in the brightness adjustable range.
3. The method of claim 1, wherein: and when the brightness adjustment requirement comprises a plurality of groups of brightness levels and brightness adjustable ranges corresponding to the brightness levels, acquiring duty ratios corresponding to two measuring points in each group of brightness adjustable ranges according to the mode of the step 2, respectively generating linear mapping relations between each group of brightness levels and the duty ratios, and combining to obtain a linear mapping relation table of the whole brightness levels.
4. The method of claim 1, wherein: when the linear mapping relation table of the brightness level and the duty ratio of one display is adjusted and applied to the same type display, the method further comprises the following steps:
based on the obtained linear mapping relation table, respectively searching the duty ratios corresponding to the two measuring points in the brightness adjustable range as central positions, and determining the duty ratios corresponding to the two measuring points of the current display under the condition of meeting a preset brightness error;
and searching the duty ratios of the two measuring points of the current display in a mode of increasing the duty ratio and decreasing the duty ratio when the duty ratio center points of the two measuring points are searched respectively.
5. The method of claim 1, wherein: the preset brightness error is that the absolute value of the error between the actual brightness and the theoretical brightness is minimum or the error is less than 10%.
6. The method of claim 1, wherein: if the error between the actual brightness and the theoretical brightness of the display exceeds the preset brightness error range, the method further comprises: and adjusting the duty ratio until the error between the actual brightness and the theoretical brightness of the display is within the preset brightness error range.
7. An apparatus based on the method of any one of claims 1-6, characterized in that: the method comprises the following steps: the electronic terminal is in communication connection with the brightness tester, the electronic terminal is in communication connection with an image board of the display, the brightness tester measures the actual brightness of the display, and the electronic terminal outputs a linear mapping relation table of the brightness grade and the duty ratio to the image board.
8. A system based on the method of any one of claims 1-6, characterized by: the method comprises the following steps: the system comprises an electronic terminal, a brightness tester and a display; the electronic terminal is in communication connection with the brightness tester, the electronic terminal is in communication connection with an image board of the display, the brightness tester measures the actual brightness of the display, and the electronic terminal outputs a linear mapping relation table of the brightness grade and the duty ratio to the image board.
9. An electronic terminal, characterized by: comprising a processor and a memory, the memory storing a computer program that the processor calls to perform: the process steps of any one of claims 1 to 6.
10. A readable storage medium, characterized by: a computer program is stored, which is invoked by a processor to perform: the process steps of any one of claims 1 to 6.
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