Drive circuit for use with transmissive scattered liquid crystal display device
US5532712A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1994 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Aug 15, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G3/3692
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A drive circuit, for use with a transmissive scattered liquid crystal display device, prevents a residual image caused by a high speed display switching, while having a reduced size and fewer parts, thereby improving reliability. The drive circuit comprises a shift register (3a), a first gate for functioning as an AND circuit (2a), a second gate for functioning as an exclusive OR circuit (2b), and a switching device (7) with a higher withstand voltage than a logic signal. These constructional elements are formed within an IC. A logic signal for driving the liquid crystal display device is input to the second gate (2b). The output of the buffer (8) is connected to a totem pole drive circuit (10) for driving a common electrode (C) with a high voltage (HV) which is synchronized with the logic signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.