A method for stabilizing high brightness of liquid crystal display backlight
A technology for stabilizing liquid crystals and brightness, applied to static indicators, light sources, instruments, etc., can solve the problems of optical parameters affecting the display effect of LCD screens, incomplete brightness of backlights, changes in luminous efficiency, etc., and achieve good quality display images , Backlight brightness reduction rate is low, the effect of low cost
Active Publication Date: 2016-08-17
中航华东光电有限公司
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However, with the addition of backlight, after the backlight works for a certain period of time or after the working temperature changes, the luminous efficiency will change accordingly, the brightness will attenuate, and the brightness of the LCD will change compared with the factory state, which will affect the display effect and optical parameters of the LCD screen; At the same time, due to individual differences in backlights and process errors, the brightness of each set of backlights at the same driving level is not completely consistent, which affects the display quality.
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[0021] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.
[0022] see figure 1 , figure 2 A method for stabilizing the high brightness of the backlight of a liquid crystal display provided in this embodiment comprises the following steps:
[0023] (1) Use the photosensitive sensor to collect the actual brightness of the backlight. The sampling circuit of the photosensitive sensor is as follows: figure 1 shown;
[0024] (2) Send the analog voltage collected by the photosensitive sensor to the single-chip microcomputer for A / D conversion to obtain a digital quantity, and the single-chip microcomputer filters the converted digital quantity to ensure that the sampled backl...
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The invention discloses a method for stabilizing the high brightness of the backlight of a liquid crystal display, comprising the following steps: (1) using a photosensitive sensor to collect the actual brightness of the backlight; (2) sending the analog voltage collected by the photosensitive sensor to a single chip microcomputer The A / D conversion obtains the digital quantity, and the single-chip microcomputer filters the converted digital quantity to obtain a stable actual brightness feedback value, which is transmitted to the upper computer of the liquid crystal display for display; (3) the single-chip microcomputer judges whether it is necessary to perform light Feedback compensation, when it is detected that the actual luminance feedback value is less than the theoretical luminance feedback value, light feedback compensation is performed, and the single-chip microcomputer automatically increases the brightness driving level of the backlight to keep the brightness of the backlight stable. Compared with the prior art, the present invention has the following advantages: the brightness of the backlight of the liquid crystal display can be adjusted independently in real time, so that the brightness of the backlight of the liquid crystal display can be kept stable and consistent for a long time during the long-term working process.
Description
technical field [0001] The invention relates to the technical field of brightness adjustment of liquid crystal displays, in particular to a method for stabilizing the high brightness of a backlight of a liquid crystal display. Background technique [0002] Liquid crystal display is a passive display and cannot emit light by itself. Due to the special structure of the liquid crystal display, the liquid crystal screen itself as the source of display information does not emit light, and the characteristics of local transmission and reflection are changed under the control of the electric field. The liquid crystal display will not produce self-luminous displays such as CRT, PDP, OLED, etc. Inevitable pixel aging, color drift during use, and aging of the backlight can all cause the brightness of the display to decay, and it can only be displayed by the light of the surrounding environment. Need to add backlight device, liquid crystal display just can have bright image display. ...
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IPC IPC(8): G09G3/34G09G3/36H05B37/02
Inventor 徐勇飞李斌黄荣园夏云奇王亮
Owner 中航华东光电有限公司