Method and device automatically adjusting backlight luminance
A backlight brightness and automatic adjustment technology, applied in current supply devices, telephone communications, advanced technology, etc., can solve problems such as increased power consumption, sensing error of light intensity of photosensitive devices, flickering screen, etc., to improve visual experience and reduce power consumption. Consumption, improve the effect of adjustment accuracy
Active Publication Date: 2014-01-15
LEADCORE TECH
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[0006] But these two solutions both face the same problem: the photosensitive device itself has a certain error in sensing the light intensity, and the light environment where the user is located is also very different, so the sampled light intensity data will fluctuate within a certain range. Adjust the threshold of the backlight, and the sampling data just fluctuates near the threshold, the backlight will be adjusted continuously, causing the flickering phenomenon, which affects the user experience and increases power consumption
[0008] The number of levels to automatically adjust the backlight is less. Although increasing the number of levels can reduce power consumption, the probability of flickering will also increase accordingly.
[0009] In the case of unstable light, frequent adjustment of the backlight may occur
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[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.
[0043] see figure 1 and figure 2 , the invention provides a method for automatically adjusting the brightness of a backlight, the method comprising the steps of:
[0044] Step 1: Obtain the sampling data of the current light intensity.
[0045] In step 1, the central processing unit 10 controls the light sensor 13 to acquire light intensity sampling data. The value range of the sampling data is [0, 255]. The larger the value, the greater the light intensity.
[0046] Step 2, smoothing the sampled data.
[0047] In step 2, the volatility of the sampled data is reduced by smoothing the sampled data, that is, in a stable light intensity environment, there is little difference in the sampled data at different times, and the curvature of ...
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The invention discloses a method automatically adjusting backlight luminance and relates to the technical field of the embedded device screen backlight luminance adjustment. The method comprises the following steps: firstly, sampling the ambient light intensity and obtaining the sampling data; secondly, performing smoothing treatment to the sampling data; thirdly, in the light of the corresponding relationship between the light intensity and the sampling data, obtaining the corresponding present light intensity level in accordance with the sampling data; fourthly, in accordance with the corresponding relationship between the light intensity and the sampling data, determining the present backlight luminance; fifthly, adjusting the backlight luminance in accordance with the present backlight luminance. The invention further provides a device automatically adjusting backlight luminance. The invention is suitable for handheld embedded devices such as mobile phone, PDA, etc. The invention not only can raise the adjusting precision by increasing the automatic light adjusting levels, but also can improve the user experience and can reduce the power consumption. The screen will not flicker even under the continuous ambient light change.
Description
technical field [0001] The invention relates to the technical field of screen backlight brightness adjustment for embedded devices, in particular to a method and device for automatically adjusting backlight brightness. Background technique [0002] In embedded handheld devices, especially with the popularization of mobile 3G technology in China, more and more 3G mobile phones will be launched soon. 3G mobile phones are usually equipped with high-brightness and large-size display screens and support rich multimedia data services. These Both pose great challenges to the battery life of mobile phones. Among them, the backlight of the display screen consumes a lot of power. If the backlight of the display screen can be automatically adjusted according to the light environment of the user, it can effectively reduce power consumption and improve battery life. At the same time, a good automatic backlight adjustment function can bring more comfort to the user. visual experience. H...
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IPC IPC(8): H04M1/725H04M1/73H04M1/72454
CPCY02D30/70
Inventor 蒋慧军周婧
Owner LEADCORE TECH