Method, device and terminal for adjusting screen backlight brightness

A backlight brightness, screen technology, applied in the field of communication, can solve problems such as changes

Active Publication Date: 2014-12-24
HUAWEI DEVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then, in the case of the existing screen brightness gradient, the human eye may feel the change of the screen brightness in some scenes

Method used

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  • Method, device and terminal for adjusting screen backlight brightness
  • Method, device and terminal for adjusting screen backlight brightness
  • Method, device and terminal for adjusting screen backlight brightness

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0126] The first embodiment: the screen backlight brightness and ambient light brightness of the current frame are considered at the same time.

[0127] Let N=0.0167*200, M=0.0167*40, where 0.0167 is the time per frame at a frequency of 60 Hertz (HZ). It can be understood that when the frequency of the screen changes, the time of each frame also changes; and 200 and 40 are empirical coefficients, which can be a certain number between 10-1000 as the frequency and other parameters change, so we can get The iterative formula is:

[0128] For brightness boosting process: X n+1 =Min(X n +0.0167*200*X n / 255*L^(1 / 4), B), calculated once per frame, when X n+1 =B stop.

[0129] For the process of reducing brightness: X n+1 ’=Max(X n ’-0.0167*40*X n ’ / 255*L’^(1 / 4), B’), calculated once per frame, when X n+1 '=B' to stop.

[0130] Scenario 1: In the current indoor lighting environment, the brightness of the screen backlight is 80 at this time. If the brightness of the ambient ...

no. 2 approach

[0139] The second implementation manner: only the screen backlight brightness of the current frame is considered.

[0140] Assuming N=0.0167*200, M=0.0167*40, the iterative formula can be obtained as:

[0141] For brightness boosting process: X n+1 =Min(X n +0.0167*200*X n / 255, B), calculated once per frame, when X n+1 =B to stop.

[0142] For the process of reducing brightness: X n+1 ’=Max(X n ’-0.0167*40*X n ’ / 255, B’), calculated once per frame, when X n+1 '=B' to stop.

[0143] Scenario 1: In the current indoor lighting environment, the brightness of the screen backlight is 80 at this time. If the brightness of the ambient light is 10000lux outdoors, the brightness of the screen backlight will rise to 255. The gradual change process at this time (from the initial brightness of 80 to the target brightness of 255) is as follows Figure 7 As shown, it only takes 1.5 seconds to complete.

[0144]Only considering the screen backlight brightness of the current frame ...

no. 3 approach

[0152] The third implementation manner: only the brightness of the ambient light is considered.

[0153] Assuming N=0.0167*40, M=0.0167*10, the iterative formula can be obtained as:

[0154] For brightness boosting process: X n+1 =Min(X n +0.0167*200*L^(1 / 4), B), calculated once per frame, when X n+1 =B stop.

[0155] For the process of reducing brightness: X n+1 ’=Max(X n ’-0.0167*40*L’^(1 / 4), B’), calculated once per frame, when X n+1 '=B' to stop.

[0156] Scenario 1: In the current indoor lighting environment, the brightness of the screen backlight is 80 at this time. If the brightness of the ambient light is 10000lux outdoors, the brightness of the screen backlight will increase to 255. The gradual change process at this time (from the initial brightness of 80 to the target brightness of 255) is as follows Figure 11 As shown, it only takes 0.5 seconds to complete.

[0157] Since only the brightness of the environment is considered, the rising and falling speed o...

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Abstract

The invention relates to a method, device and terminal for adjusting screen backlight brightness. The method for adjusting the screen backlight brightness comprises the steps that an original value and a target value of the screen backlight brightness are determined; according to the brightness variable quantity when the screen backlight brightness of a current frame changes to the screen backlight brightness of the next frame, the screen backlight brightness of the next frame is adjusted until the screen backlight brightness is adjusted from the original value to the target value, wherein the brightness variable quantity when the screen backlight brightness of the current frame changes to the screen backlight brightness of the next frame is relevant to one or a combination of the following factors which are the screen backlight brightness of the current frame and the brightness of the environmental light. Accordingly, in the adjusting process of the screen backlight brightness, the screen backlight brightness and / or the environmental brightness are / is taken into consideration, so that changing of the screen backlight brightness is smoother, and eyes of people can not feel the changing of the screen backlight brightness.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a method and device for adjusting the brightness of a screen backlight and a terminal. Background technique [0002] In the electronics industry, backlighting is a form of lighting that is often used on liquid crystal displays. The liquid crystal display itself does not emit light, and a backlight source needs to be set behind the liquid crystal display, so the liquid crystal display uses the fine liquid crystal particles evenly arranged on the screen to "block" and "turn on" the light emitted by the backlight source to achieve restore the screen. Therefore, the brightness of the screen backlight will directly affect the brightness of the screen. [0003] At present, the brightness of the screen backlight of the mobile terminal can be automatically adjusted. For example, when the mobile phone automatically adjusts the brightness of the screen backlight, it usually adopts a g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G5/10G09G3/36
CPCG09G3/3406G09G2320/0653G09G2360/144
Inventor 杨泓
Owner HUAWEI DEVICE CO LTD
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