Circuit for driving liquid crystal panel

Details Circuit for driving liquid crystal panel Circuit for driving liquid crystal panel

1992-07-27

1993-10-05

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

358241, 345 98, 345208, G02F 1133, G09G 336

Patent

active

052510514

ABSTRACT:
A circuit for driving a liquid crystal panel includes an A/D converter for converting image data to digital data, a shift register for generating horizontal scanning signals, a capacitor group formed of capacitors the number of which corresponds to the number of bits of digital data, a selector for selecting none or at least one capacitor from among the capacitor group on the basis of horizontal scanning signals and digital data, a power-supply section for supplying an electric charge to each capacitor, first switch sections for charging an electric charge to selected capacitors only in every horizontal synchronization period, and second switch sections for connecting all capacitors to their corresponding signal electrodes S in every horizontal synchronization period. Even if the liquid crystal panel is formed into a large screen, neither is its parts mounting surface increased considerably, nor do the costs increase. In addition, a display having a high resolution can be realized with a simple construction.

REFERENCES:
patent: 4748515 (1988-05-01), Umezawa
patent: 4845482 (1989-07-01), Howard et al.

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