Liquid crystal drive device and liquid crystal panel driving method

Abstract

Abstract PURPOSE:To prevent picture quality from being deteriorated and to obtain a proper display image by comparing a signal voltage value to be impressed to liquid crystal with a prescribed voltage and restricting the signal voltage value in accordance with the compared result. CONSTITUTION:An input video signal voltage is adjusted to a prescribed amplitude Vb - Va an amplitude voltage adjusting means 1. A voltage level corresponding to a value most similar to black out of video signal levels is adjusted from the prescribed value Va to Vb by a DC level adjusting means 2. A contour emphasizing means 3 applies contour emphasizing processing to the adjusted signal, a comparing means 4 compares the video signal voltage with the prescribed voltage value Va and a signal level control means 5 restricts the signal voltage to a signal having DC level higher than the Va. A liquid crystal driving means 6 impresses the video signal voltage to a liquid crystal panel 7.

Inventors

• 👤 Mitsuru Odaka
• 👤 満 小高
• 👤 Tsutomu Muraji
• 👤 努 連

Bibliographic Details