Adoptive back-light adjusting system and method
A modulation and backlight technology, applied in optics, nonlinear optics, instruments, etc., can solve problems such as unstable image quality, uneven light emission, and display flickering of liquid crystal displays, so as to reduce temperature, save power, and extend service life Effect
Active Publication Date: 2009-04-29
AU OPTRONICS CORP
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Problems solved by technology
However, the traditional backlight adjustment often only considers factors such as the ambient light source, and ignores the above-mentioned problems. Therefore, the traditional adjustment method is likely to cause flickering phenomena on the LCD display, and cause uneven light emission on the LCD screen, making the image quality of the LCD display unstable.
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[0024] The present invention provides a backlight modulation system and a modulation method thereof. The brightness compensation signal is used to adaptively adjust the brightness of an image frame and the backlight control signal is used to adjust the light source brightness of a backlight module, so that the image presented by the image frame on a display device is maintained Consistency, and saves the power consumption of the display device, thereby reducing its working temperature and prolonging the service life of the display device. In addition, the backlight modulation system calculates the dark state ratio value of the pixels of the image frame to increase the contrast of the image frame to improve the picture quality of the display device. The backlight modulation system and the modulation method of the present invention are applicable to the backlight modules of liquid crystal displays (LCD) and liquid crystal televisions, or to display devices with backlight modules.
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An adaptive back light modulating system and the method include the brightness matching distribution device, the brightness compensation device, the image frame adjusting device, the back light controlling device and a back light module. The brightness matching distribution device can generate the brightness matching distribution value of every image frame. The brightness compensation device computes the dark ratio and the brightness index value of the image frame according to the brightness matching distribution value to generate the brightness compensation signal. The image frame adjusting device adjusts the brightness of the image frame according to the brightness compensation signal. The back light controlling device can renew the brightness index value according to the brightness index value and the brightness matching distribution to generate the back light controlling signal corresponding to the present image frame. The back controlling device adjust the back light of the back light module according to the back light controlling signal to make the brightness of the image frame match with the luminescent curve of the back light module.
Description
Technical field [0001] The invention relates to a modulation system and a modulation method thereof, in particular to an adaptive backlight modulation system and a modulation method thereof. Background technique [0002] Liquid crystal displays are generally divided into transmissive liquid crystal displays, reflective liquid crystal displays, and semi-transmissive / semi-reflective liquid crystal displays. The transmissive liquid crystal displays are equipped with a backlight module. The light source used in the backlight module can be roughly divided into cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp, CCFL), hot cathode fluorescent lamp, light-emitting diode or other electroluminescent device (Electro Luminescent Device, EL device). The mainstream is cold cathode fluorescent lamps (CCFL). [0003] Since the liquid crystal display is in the dark state (that is, the gray scale value is low), the light leakage effect is more significant. Moreover, with the growing dem...
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IPC IPC(8): G02F1/13357G09G3/34G02F1/1335
Inventor 周明忠谢曜任黎焕欣
Owner AU OPTRONICS CORP