Device and method for improving contrast value of display panel and image display system

Abstract

The invention relates to a device and a method for improving the contrast value of a display panel and an image display system. The device comprises a controller and an optical detector. The method comprises the following steps: providing a plurality of voltage values for the display panel, detecting a plurality of brightness values respectively generated by the display panel according to the voltage values, and selecting one voltage value corresponding to one extremum of the brightness values as the peak voltage of the display panel. The image display system is integrated with the display panel and a memory, wherein the peak voltage selected by the contrast-value improving method is memorized in the memory. The invention improves the contrast value of the display panel.

Description

technical field [0001] The invention relates to a contrast value improving device and method and an image display system, in particular to a contrast value improving device and method and an image display system applied to a display panel. Background technique [0002] In a dark room, the value obtained by dividing the measured brightness value of the all-white screen of the LCD monitor by the measured brightness value of the completely black screen is defined as the contrast ratio. Therefore, the brighter the white, the darker the black, the The higher the contrast value. And when the contrast value of the liquid crystal display is higher, the image quality presented is better. Therefore, improving the contrast value of the liquid crystal display is a direction that manufacturers are striving for. [0003] See figure 1 , which represents the change curve of the pixel voltage value applied to the liquid crystal display relative to the light transmittance. As shown in the ...

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Problems solved by technology

In other words, when the maximum value of the pixel voltage value (also known as the black voltage) is set at the reverse voltage (reverse voltage), the panel can obtain the best contrast value. However, because of the panel manufacturing process Variation will lead to different curves of pixel voltage value relative to light transmittance for each assembled liquid crystal panel, as shown in the figure, curve 1, curve 2 and curve 3, their inversion The voltage 1, reverse voltage 2 and reverse voltage 3 will be distributed in a voltage interval 10

In the existing methods, in order to avoid the phenomenon of "gray scale inversion", manufacturers will uniformly set the black voltage of liquid crystal panels with different characteristics at a fixed value at the lower boundary 101 of the inversion voltage range, so as to Get a larger error buffer space

But in this way, the panel just can't get its true best contrast value performance, and how to improve the above-mentioned many defects is the main purpose of the present invention.

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