Hold type image display system

Abstract

The present invention aims to prevent display luminance difference and burning with a line at which the polarity inversion switches when the order of inversion of black and video changes in the middle of the screen by a frame polarity inversion drive in a liquid crystal display device for performing black insertion drive. An enable signal (VOE) to each gate driver 5A to 5N is independently controlled, a start pulse (VSP) input to write a black signal is performed at an arbitrary timing within one frame period with respect to the gate driver 5A to insert a black image within one frame period, a write polarity of the video signal is inverted in frame cycle with the video display start pulse as a base point, and a write polarity of the black image signal is inverted in frame cycle with the black display start pulse as a base point.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from Japanese patent application No. 2007-086191, filed on Mar. 29, 2007, and Japanese patent application No. 2008-039352, filed on Feb. 20, 2008, the disclosure of which is incorporated herein in its entirety by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to image display devices and image display methods thereof, and image display programs, in particular, to a hold type image display system.[0004]2. Description of the Related Art[0005]A liquid crystal display (LCD) is being widely used since it is thin and does not occupy as much installation area compared to a CRT (Cathode Ray Tube) display. However, in the hold type display device such as LCD, an image is continued through a frame period as opposed to an impulse type display device such as CRT display, and thus a moving image tends to become unclear.[0006]In th...

AI Technical Summary

Benefits of technology

[0017]As an exemplary advantage according to the invention, the present invention can finely adjust the black image insertion rate with respect to one frame period while taking into consideration the balance between the merit of reducing the moving image blur and the demerit of lowering in luminance in the hold type display device, and display luminance difference and burning having a line at which the polarity inversion switches as a boundary caused by variation in field through of the display panel surface and variation in positive and negative of application voltage are prevented.

Problems solved by technology

However, in the hold type display device such as LCD, an image is continued through a frame period as opposed to an impulse type display device such as CRT display, and thus a moving image tends to become unclear.

However, in most liquid crystal display devices pseudo-driven in the impulse type display, a black signal and a video signal are alternately written to each pixel at a constant cycle, and thus only the black signal is written in one polarity and only the video signal is written in the other polarity if the cycle of inversion drive and the cycle of black insertion coincide, whereby the DC component is applied to the liquid crystal panel causing burning of the liquid crystal panel and degradation in lifetime.

However, in the display device of patent document 2 configured as shown in FIG. 18, since the black insertion drive of inserting the black image at a specific proportion within one frame is performed, to which pixel of the display screen the black signal is used differs depending on a black insertion rate, and the black signal is positioned in the middle of the display screen at the switching of the frames of the video signal, whereby it is difficult to form a sequence of inversion with the switching of the frames of the video signal as the base point.

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