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Backlight brightness regulating method

An adjustment method and technology of backlight brightness, which is applied in the field of ambient light sensing, can solve the problems of infrared light interference, affecting the automatic adjustment effect of backlight brightness, and the inability to automatically adjust the backlight brightness, so as to achieve the effect of improving reliability and safety

Inactive Publication Date: 2008-07-02
KONKA GROUP
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the brightness of the backlight cannot be automatically adjusted, and the filtering effect on the infrared light is not good; the interference of the infrared light is caused, which affects the automatic adjustment effect of the brightness of the backlight

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  • Backlight brightness regulating method

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Embodiment Construction

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The present invention utilizes two ADCs (analog / digital converters), wherein one is used for calculating the intensity of ambient light, which includes the intensity of infrared light, and the other is used for separately calculating the intensity of infrared light, and utilizes software algorithms to convert the intensity of ambient light into the intensity of infrared light. Infrared light filtering minimizes the influence of infrared light on ambient light.

[0029] As shown in FIG. 1 , the present invention provides a method for adjusting the brightness of a backlight, which includes the following steps.

[0030] A1. Preset the formula for calculating the actual visible light intensity by using the ratio of the infrared light intensity to the ambient light intensity, wherein the ambient light includes visible light and infrared light...

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Abstract

The invention discloses an adjusting method for backlight illumination, which comprises the following steps: A1. presetting a formula for computing the real visible light intensity by the ratio of infrared light intensity and environment light intensity, wherein the environment light comprises the visible light and the infrared light at the visible light regions; A2.inducing the environment light and the infrared light respectively, and computing the environment light intensity and the infrared light intensity; A3.computing the ratio; A4.computing the real visible light intensity according to the formula; and A5.controlling the duty cycle of pulse width modulation and adjusting the backlight illumination according to the real visible light intensity. The invention achieves the object of automatic adjustment of the backlight illumination, filtering the interfere of infrared light effectively, improving the reliability and safety of automatic adjustment of the backlight illumination, realizing the automatic adjustment of the illumination of liquid crystal screen in different illumination environments, and achieving the effect of energy saving.

Description

technical field [0001] The present invention relates to ambient light sensing technology, in particular to a method for adjusting the brightness of a backlight. Background technique [0002] At present, LCD TVs are popular in a large number, and the brightness of the backlight of many LCD TVs cannot be adjusted automatically, and some of them can be adjusted in brightness, but there are defects, for example, the filtering effect on infrared light is not good. Although infrared light is not visible light, the photosensitive device can receive infrared light. If the infrared light is not removed, the photosensitive device will calculate infrared light as visible light, which will affect the accuracy of sensing visible light, and finally affect the TV backlight. Accuracy of brightness adjustment. [0003] In order to filter infrared light, the prior art usually adopts the method of sticking a film on the device, which has inherent defects: the sticking film may be scratched, s...

Claims

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Application Information

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IPC IPC(8): G09G3/34G09G3/36G09G5/10G01J1/42G01J1/44
Inventor 梁恩志张晔
Owner KONKA GROUP
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