Control method and control apparatus for liquid crystal display

Abstract

The image display apparatus of the invention applies a tone-based voltage, which corresponds to a tone value of image data at each of multiple pixels on a VA liquid crystal display, to the pixel for display of an image represented by the image data on the VA liquid crystal display. The tone-based voltage of each pixel is restricted, based on a transmittance-voltage characteristic of the pixel that differs by the position of the pixel on the plane of the VA liquid crystal display. This arrangement ensures application of adequate voltages according to the tone values of image data to the VA liquid crystal, thus enhancing the quality of images displayed on the VA liquid crystal display.

Description

technical field [0001] The present invention relates to the control of a liquid crystal panel, and in particular, to the control of a liquid crystal panel in which liquid crystal molecules enclosed between opposing substrates become oriented perpendicular to the substrates in a state where no voltage is applied. Light is blocked, and the orientation is changed to the side parallel to the substrate according to the applied voltage, thereby allowing light to pass through. Background technique [0002] Liquid crystals are classified and called according to the characteristics of their liquid crystal alignment, and liquid crystals with the above-mentioned liquid crystal alignment are called VA (Vertical Alignment: Vertical Alignment) liquid crystals. Since the VA liquid crystal does not cause so-called twist in the liquid crystal alignment caused by the application of voltage, it has a short response time and a large viewing angle (viewing angle), so it is being rapidly populari...

AI Technical Summary

Problems solved by technology

[0006] When a uniform limit is placed on the applied voltage in this way, it is impossible to apply a voltage exceeding the upper limit voltage or a voltage lower than the lower limit voltage. Therefore, it can be predicted that the luminance variation can be improved in any display part in the panel of the liquid crystal panel. However, it has been found that in Uniform improvement in luminance variation across panels

Moreover, since the voltage to be applied is uniformly limited, the brightness of the displayed image is limited to the limited voltage range, and there is a possibility that the brightness, dynamic range, etc. will be reduced.

Images