Liquid crystal display device and driving method thereof

Abstract

The present invention provides a liquid crystal display device (1) capable of clearly viewing the boundary of an image even when a backlight (15) is flickered and the lighting interval is changed when displaying a moving image, and a driving method thereof. A liquid crystal display device (1) includes a liquid crystal panel (13) and a backlight (15) that irradiates light to the liquid crystal panel. One frame period includes a lighting time and a lighting time of the backlight (15). By changing the lighting time and Change the lighting interval of the backlight (15) according to the length of the extinguishing time to change the brightness. The liquid crystal display device (1) further includes an OS processing circuit (11) that controls the driving voltage applied to the liquid crystal panel (13) by setting the magnitude of the driving voltage applied to the liquid crystal panel (13) when gray scale transitions. The OS processing circuit (11) under the condition that the lighting time of the backlight (15) is different, and the grayscales before the transition and the grayscales after the transition are respectively the same, the backlight (15) The longer the lighting time is, the larger the magnitude of the driving voltage applied to the liquid crystal panel (13) when the gray scale changes is set.

Description

technical field [0001] The present invention relates to a liquid crystal display device whose brightness is changed by changing the lighting interval by flickering a backlight and its driving method. Background technique [0002] Currently, as a display device, an impulse type display device such as a CRT (cathode ray tube) and a hold type display device such as a liquid crystal display device are known. [0003] In an impulsive display device, focusing on each pixel, an on period in which an image is displayed and an off period in which an image is not displayed are alternately repeated. For example, in the case of displaying a moving image, since a blackout period is inserted when rewriting an image on one screen, an afterimage of a moving object does not appear to the human eye. Therefore, the background and the object can be clearly distinguished, and moving images can be viewed without a sense of incongruity. [0004] On the other hand, in a hold-type display device, ...

AI Technical Summary

Problems solved by technology

[0010] Therefore, in a liquid crystal display device whose driving time (writing time) per pixel is short, and whose screen has been increased in size or high in definition in recent years, there may be a problem that the alignment state of the liquid crystal molecules changes within the writing time. The change cannot keep up with the change of the applied voltage, and the desired display gray scale cannot be achieved

Images