Liquid crystal television and a liquid crystal display control method

Abstract

When a video signal type detection section detects a video signal of the PAL method or the SECAM method (50Hz), it subjects the input image data to emphasis conversion processing with a smaller emphasis conversion degree than the NTSC method (60Hz), thereby improving the liquid crystal response speed, preventing generation of a video noise by excessive emphasis, and suppressing the image deterioration. As a result, it is possible to perform emphasis conversion for the input image data so as to compensate the optical response characteristic of the liquid crystal display panel and to prevent generation of a video noise by an excessive emphasis conversion for the image data of the PAL method or the SECAM method (50 Hz), thereby displaying a high-quality image.

Description

technical field [0001] The invention relates to a liquid crystal television using a liquid crystal display panel to display images, in particular to a liquid crystal television capable of improving the optical response characteristics of the liquid crystal display panel. Background technique [0002] In recent years, due to the reduction in weight and thickness of products such as personal computers and televisions, display devices have also been required to be lighter and thinner. In accordance with such requirements, liquid crystal display devices (LCD) that replace cathode ray tubes (CRT) have been developed. Such a flat panel display. [0003] LCD is a display device that applies an electric field to a liquid crystal layer with anisotropic dielectric constant injected between two substrates, adjusts the strength of the electric field, and adjusts the amount of light transmitted through the substrates to obtain a desired video signal. Such LCDs are representative product...

AI Technical Summary

Problems solved by technology

[0018] In the above-mentioned overshoot driving method, the gray level of the input image data is emphasized and converted to the direction of gray scale change, so that the liquid crystal display panel reaches the target gray scale determined by the input image data after a predetermined vertical display period. Brightness, even under the same conditions, input image data with different playback formats, when the vertical frequency (vertical display period) of the input image data is different, the grayscale brightness achieved by the liquid crystal after a vertical display period is also different, so it cannot to make the overshoot drive work correctly

[0019] For example, in the current TV broadcasting, there are NTSC system with a vertical frequency of 60Hz (525 scanning lines), PAL system and SECAM system with a vertical frequency of 50Hz (625 scanning lines), and TV signals for receiving these broadcasting systems have been developed. and can display a multi-standard TV set, but when the above-mentioned existing liquid crystal display device is used for such a multi-standard TV set, the overshoot drive cannot be made to work correctly, and the error of the inter-frame data is enlarged, resulting in Image noise that does not exist in the original input image data may degrade the image quality of the displayed image

Images