Driving circuit for liquid crystal display device
US4746197A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1986 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | Jul 24, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/3614
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal display device comprises: a liquid crystal module including liquid crystal display panel having a plurality of liquid crystal picture elements arranged in a matrix form, and driving circuits for applying driving signals to signal electrodes and to scanning electrodes of the liquid crystal display panel, respectively; a control circuit for controlling operations of the liquid crystal module; and a means for inverting polarity of a voltage to be applied to a liquid crystal layer by generating a control signal M' having a period m.tau. which signal inverts the polarity of the voltage to be applied to the liquid crystal layer whenever a clock signal having a period .tau. is counted a predetermined number m/2. However, if a period of a frame frequency is n.tau. and an arbitrary integer is L, PA1 (1) m is set to be 2n/(2L-1), or PA1 (2) m is set to be n/L and the control signal M' is inverted per said frame period n.tau., or PA1 (3) m is set to satisfy L-1/2<n/m<L, or PA1 (4) m is set to satisfy L-1<n/m<L-1/2 and the control signal M' is inverted per the frame period n.tau.. Furthermore, if the least common multiple of 2n and m is H, values of m are set so that both H/(2…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.