Gray tone driving method for steady-state

Abstract

The invention supplies a bistable nematic LCD gray scale driving method that separates the image to at least one first section image, a second section image and a third section image. The method includes following steps: driving the first section image to drive bistable nematic LCD to a preset state; driving the second section image to write the gray scale image data into pixel; driving the third section image to return the effect voltage to zero and returning the corresponding stable state of corresponding image data. The image data would be updated without electric power. Thus, the power consumption would be decreased.

Description

technical field [0001] The invention relates to a gray-scale driving method of a bistable chiral nematic liquid crystal display; in particular, it relates to an active gray-scale driving method of a bistable chiral nematic liquid crystal display. Background technique [0002] The generally known bistable chiral nematic liquid crystal displays mostly use the multi-task driving method of passive matrix pixels to display the picture. Several different methods have been proposed, such as the dynamic driving method of US Patent No. 5,748,277 or the incremental driving method of US Patent No. 6,204,835. However, due to the limitation of the driving of the passive matrix, it is difficult to improve the resolution, dynamic picture, display quality and driving cost of the bistable chiral nematic liquid crystal display. [0003] Philips uses a dynamic driving method to drive an active matrix bistable pair of chiral nematic liquid crystal displays, which makes its pixel design very co...

AI Technical Summary

Problems solved by technology

However, based on the limitations of the passive matrix on the drive, it is difficult to improve the resolution, dynamic picture, display quality and driving cost of the bistable nematic liquid crystal display.

[0003] Philips uses a dynamic driving method to drive an active matrix bistable pair of chiral nematic liquid crystal displays, which makes its pixel design very complicated in order to achieve the special waveform of the dynamic driving method. According to Philips’ US Patent No. 6,703,995, its The pixel is designed with a 5T1C structure. In order to control the transistors of this structure, a lot of control signals are added. This design increases the cost of the driving system and complicates the pixel design, which may reduce the yield rate, and multiple transistors and capacitors make the aperture ratio of the pixel Reduced, affecting display quality

[0004] In addition, Toshiba's U.S. Patent No. 6,052,103 adopts a traditional design for the pixel structure of bistable nematic liquid crystals. During an addressing drive period, different states of driving voltage waveforms are written in the pixel electrodes. The transition time required for a state is much longer than the time required for charging the pixel electrode, which causes the driving time of the above method to be too long, especially when the resolution of the display is increased, the driving time is too long and the animation performance is lost. Even the quality of the page change screen deteriorates

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