LCD device, driving device and method

Abstract

The invention discloses a liquid crystal display device, a driving device and a driving method thereof. The liquid crystal display device comprises a display screen, a first substrate and a second substrate which are oppositely arranged, a first liquid crystal layer filled between the first substrate and the second substrate, a plurality of first pixels arranged in matrixes are formed on the second substrate; a backlight positioned behind the display screen for providing light source for the display screen, wherein, an adjusting screen is arranged between the display screen and the backlight and used for dynamically adjusting the intensity of the incident light of the display screen; the adjusting screen includes a third substrate and a fourth substrate which are oppositely arranged, a second liquid crystal layer filled between the third substrate and the fourth substrate, and a plurality of second pixels arranged in matrixes are formed on the fourth substrate; the position of the adjusting screen is aligned with the display screen, and the second pixels of the adjusting screen correspond to the first pixels of the display screen one to one. The adjusting screen in the liquid crystal display device of the invention can adjust the size of the incident light of the display screen in real time in the range of the pixel area according to the input signals of the display screen so as to improve the dynamic contrast of the display screen.

Description

Technical field [0001] The present invention relates to a liquid crystal display device, a driving device and a driving method thereof, and in particular to a liquid crystal display device capable of improving dynamic contrast, and a driving device and driving method thereof. Background technique [0002] Liquid crystal displays are currently one of the most widely used flat panel displays. Liquid crystal displays can use multiple optical parameters to characterize display performance, such as brightness, contrast, response speed, viewing angle, and so on. Among them, the contrast is an important optical parameter. The increase of the contrast can enhance the contrast effect of the picture, show a good sense of layering, and the improvement of the display effect is also obvious. [0003] There are two ways to improve the contrast: one is to increase the brightness of the white image, this method is easy to implement, but too high brightness will cause serious light leakage, image...

AI Technical Summary

Problems solved by technology

The lamp tube of CCFL is long, and one lamp tube corresponds to the brightness control of multiple display pixel areas, while LED is currently limited by packaging technology, heat dissipation technology and cost, and it is impossible to realize a backlight structure in which one LED corresponds to one sub-pixel

Therefore, the current dynamic backlight adjustment technology can only control the brightness of a certain area of ​​the backlight, which is prone to brightness crosstalk and affects the clarity and color reproduction capabilities.

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