CN115695690B - Automatic regulating method for television screen brightness - Google Patents
Automatic regulating method for television screen brightness Download PDFInfo
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- CN115695690B CN115695690B CN202211396033.3A CN202211396033A CN115695690B CN 115695690 B CN115695690 B CN 115695690B CN 202211396033 A CN202211396033 A CN 202211396033A CN 115695690 B CN115695690 B CN 115695690B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001105 regulatory effect Effects 0.000 title description 2
- 239000011324 bead Substances 0.000 claims abstract description 39
- 238000012545 processing Methods 0.000 claims abstract description 25
- 238000012360 testing method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004438 eyesight Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
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Abstract
The invention mainly relates to the field of intelligent home control. In order to solve the problems that the brightness of the electronic screen such as the current television screen and the like mainly depends on manual adjustment, can not be automatically and flexibly changed according to the ambient brightness and has complicated operation, the invention provides the method and the device for automatically adjusting the television screen brightness, the camera module is used for acquiring information data reflecting the ambient brightness, the data processing module is used for calculating the appropriate screen brightness under the ambient brightness, and the backlight control module is used for adjusting the PWM duty ratio of the control pins of the backlight beads so as to change the brightness of the backlight beads.
Description
Technical Field
The invention mainly relates to the technical field of intelligent home control, in particular to an automatic television screen brightness adjusting method.
Background
The household appliances with the image display function such as televisions and computers are taken as one of the most important household appliances for users, almost each household has one or more televisions or computers, at present, the brightness of the intelligent household screen with the image display function such as televisions is manually adjusted by means of a remote controller, but the brightness of the screen is inconvenient and complicated to operate by means of manual adjustment only along with the wider application environment range of the household appliances, and the adjustment precision is low, so that the power consumption of electronic equipment is extremely high, and the use experience of the users is influenced.
Along with the rapid development of television intelligence, a camera is used as an important peripheral of man-machine interaction to start to adapt to a television, and the current camera metering mode is various, wherein average metering is the most main metering mode, for example, a Nikon digital camera can divide a picture taken by a viewfinder into 256 areas, and the camera can automatically obtain an average scientific metering reading after comprehensively analyzing the picture in the viewfinder, so that exposure accuracy is ensured.
Disclosure of Invention
The invention aims to solve the technical problems that:
the electronic screen brightness control method solves the problems that the electronic screen brightness of the existing television screen and the like mainly depends on manual adjustment, cannot be automatically and flexibly changed according to the environment brightness, and is complex in operation.
The invention solves the technical problems by adopting the technical scheme that:
the invention provides a device for automatically adjusting the brightness of a television screen, which comprises a camera module, a data processing module and a backlight adjusting module;
The camera module is used for acquiring an environment image, acquiring brightness values of all areas, obtaining BV values corresponding to brightness of all areas, calculating an average BV value, and transmitting the average BV value to the data processing module;
The data processing module is used for acquiring the current ambient brightness according to the BV value and preparing a backlight adjusting module to adjust the brightness of the television backlight lamp beads;
The backlight adjusting module is used for adjusting the brightness of the screen backlight lamp beads according to the current ambient brightness and changing the screen brightness.
Further, the backlight adjusting module is used for adjusting the brightness of the backlight beads according to the PWM duty ratio of the control pins of the backlight beads controlled by the ambient brightness.
On the other hand, the invention also provides a television screen brightness automatic adjustment method based on the device, which comprises the following steps:
the camera module acquires an environment image, acquires the brightness of each area of the environment, obtains BV values corresponding to the brightness of each area and reflecting the brightness of the environment, and calculates an average BV value;
The data processing module acquires the brightness of the current environment according to the average BV value;
The backlight adjusting module adjusts the brightness of the backlight lamp beads according to the current ambient brightness, so that the brightness of the television screen is adjusted.
Further, the backlight adjusting module controls the brightness of the backlight beads by adjusting the PWM duty ratio of the control pins of the backlight beads, so that the screen achieves the brightness optimum for the current environment.
Further, before the backlight adjusting module adjusts the PWM duty ratio of the backlight bead control pin, the method further comprises the steps of determining the corresponding relation between the BV value and the ambient brightness, between the ambient brightness and the PWM duty ratio of the backlight bead control pin, and writing the relation into the data processing module.
Further, the method for determining the corresponding relation between the BV value and the ambient brightness comprises the following steps: setting light sources with different brightness in a darkroom, controlling the ambient brightness, obtaining BV values under different ambient brightness, drawing a corresponding relation curve of the ambient brightness and the BV values, and writing the corresponding relation curve into a data processing module;
The method for determining the corresponding relation between the ambient brightness and the PWM duty ratio of the backlight lamp bead control pin comprises the following steps: setting light sources with different brightness to control the ambient brightness in a darkroom, obtaining the optimum screen brightness of the different ambient brightness through multiple tests, recording the PWM duty ratio of a backlight lamp bead control pin under the optimum screen brightness, and drawing a relation curve of the ambient brightness and the PWM duty ratio of the backlight lamp bead control pin; and carrying out data processing on the relation curve to enable the ambient brightness to correspond to only one PWM value within a certain range, obtaining a final relation curve between the ambient brightness and the PWM duty ratio of the backlight lamp bead control pin, and writing the final relation curve into a data processing module.
Further, when the camera module collects an environment image, the image collection frame rate is 10 frames per second.
The invention has the beneficial effects that:
According to the automatic television screen brightness adjusting method, the camera module is used for collecting the environment images in real time, BV values of all areas in the collected images are measured through an average photometry method, the environment images are collected in real time, the most real brightness value of the current environment can be ensured to be obtained, and the final environment brightness adjusting accuracy rate can be improved; the brightness of the backlight beads can be adjusted by adjusting the PWM duty ratio of the control pins of the backlight beads, so that an optical sensor can be omitted, the manufacturing cost of equipment can be saved, the control precision of a television screen can be improved, the automatic adjustment of the brightness of the television screen can be realized, the complicated manual adjustment process is omitted, and the user experience is greatly improved.
Drawings
Fig. 1 is a flowchart of a method for automatically adjusting the brightness of a television screen according to the present invention.
Fig. 2 is a schematic diagram of the relationship between BV value and ambient brightness according to an embodiment of the invention.
FIG. 3 is a schematic diagram showing the relationship between the ambient brightness and the PWM value of the backlight bead control pin after data processing according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the automatic adjusting method for television screen brightness according to the present invention obtains information data reflecting the ambient light brightness through the camera module, calculates suitable screen brightness under the ambient brightness through the data processing module, and the backlight control module adjusts the PWM duty ratio of the control pins of the backlight beads, thereby changing the brightness of the backlight beads.
Examples
The camera module can divide the shot picture into a plurality of areas, independently measure light in each area, measure the luminance value of each area, calculate the average value of BV values corresponding to the luminance of each area, and take the average value of secondary BV values as the BV value of the environment picture captured by the whole camera.
Preferably, when the camera module collects an environmental image, the frame rate of the camera module is set to be 10 frames, and an excessively high frame rate occupies a higher memory and increases the data processing burden of the CPU; too low a frame rate does not have a way to achieve the effect of continuously capturing the real-time brightness of the environment and may even reduce the user experience.
The data processing module controls the backlight adjusting module to adjust the brightness of the backlight beads according to the relationship between the BV value and the ambient brightness and the relationship between the ambient brightness and the PWM duty ratio of the backlight bead control pins corresponding to the screen brightness which is most comfortable and has the best ornamental value for users;
The relationship determination method between BV value and ambient brightness is as follows:
Setting light sources with different brightness in a darkroom, acquiring BV value data under the light sources with different brightness, and drawing a BV value and environment brightness curve shown in figure 2 by taking the environment brightness as a horizontal axis and the BV value as a vertical axis because the light source brightness is the environment brightness which is measured in the darkroom; and write the corresponding relation between BV value and ambient brightness into the data processing module
The relation between the ambient brightness and the corresponding PWM duty ratio of the backlight bead control pin is determined in the following manner:
Obtaining screen brightness with different environment brightness which enables a user to feel the most comfortable and has the best ornamental effect through multiple experiments in advance, recording PWM duty ratio of a backlight lamp bead control pin under the next screen brightness, and drawing a relation curve between the environment brightness and the PWM duty ratio of the backlight lamp bead control pin as shown in figure 3; and storing the corresponding relation between the ambient brightness and the PWM duty ratio of the backlight lamp bead control pin into a data processing module.
Because the frame rate of the captured picture is set to be 10 frames, BV value is theoretically changed at all times, in order to avoid discomfort to the user caused by frequent change of screen brightness, a segmentation mode can be adopted, when the ambient brightness is within a certain range (namely when BV value is within a certain range), only one PWM value is corresponding to maintain the screen brightness unchanged within the brightness range, and vision damage to the user is prevented.
The camera processing module transmits the obtained BV average value to the data processing module through the USB interface.
The data processing module obtains an average BV value transmitted by the camera module, obtains the current ambient brightness according to the corresponding relation between the BV value and the ambient brightness, and obtains the PWM duty ratio of the control pins such as backlight corresponding to the screen brightness which is most comfortable for users under the current ambient brightness according to the PWM duty ratio relation between the ambient brightness and the backlight bead control pins.
The lower limit of the PWM duty ratio of the backlight lamp bead control pin is set to be 30 percent, so that overshoot is prevented, and the eyesight of a user is damaged.
The backlight adjusting module analyzes the command transmitted by the data processing module, so as to adjust the PWM duty ratio of the backlight control pin and change the brightness of the backlight lamp beads, thereby realizing the change of the screen brightness.
Claims (2)
1. The automatic television screen brightness adjusting method is applied to an automatic television screen brightness adjusting device comprising a camera module, a data processing module and a backlight adjusting module, and is characterized by comprising the following steps of:
The camera module acquires an environment image, acquires the brightness of each area of the environment, obtains BV values corresponding to the brightness of each area and reflecting the brightness, and calculates an average BV value;
Determining the corresponding relation between the BV value and the ambient brightness, between the ambient brightness and the PWM duty ratio of the backlight bead control pin, and writing the corresponding relation between the BV value and the ambient brightness, between the ambient brightness and the PWM duty ratio of the backlight bead control pin into a data processing module;
The method for determining the corresponding relation between the BV value and the ambient brightness comprises the following steps: setting light sources with different brightness in a darkroom, controlling the ambient brightness, acquiring BV values under different ambient brightness, drawing a corresponding relation curve of the ambient brightness and the BV values, and writing the corresponding relation curve of the ambient brightness and the BV values into a data processing module; the method for determining the corresponding relation between the ambient brightness and the PWM duty ratio of the backlight lamp bead control pin comprises the following steps: setting light sources with different brightness to control the ambient brightness in a darkroom, obtaining the optimum screen brightness of the different ambient brightness through multiple tests, recording the PWM duty ratio of a backlight lamp bead control pin under the optimum screen brightness, and drawing a relation curve of the ambient brightness and the PWM duty ratio of the backlight lamp bead control pin; performing data processing on a relation curve of the ambient brightness and the PWM duty ratio of the backlight bead control pin, enabling the ambient brightness to correspond to only one PWM value within a certain range, obtaining a final relation curve between the ambient brightness and the PWM duty ratio of the backlight bead control pin, and writing the final relation curve between the ambient brightness and the PWM duty ratio of the backlight bead control pin into a data processing module;
the data processing module acquires the brightness of the current environment according to the average BV value; the backlight adjusting module adjusts the brightness of the backlight beads according to the acquired current ambient brightness and adjusts the PWM duty ratio of the control pins of the backlight beads, so that the brightness of a television screen is adjusted.
2. The method according to claim 1, wherein the camera module captures an ambient image at a frame rate of 10 frames per second.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211396033.3A CN115695690B (en) | 2022-11-09 | 2022-11-09 | Automatic regulating method for television screen brightness |
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| CN202211396033.3A CN115695690B (en) | 2022-11-09 | 2022-11-09 | Automatic regulating method for television screen brightness |
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