Semiconductor integrated circuit device
US5532718A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1995 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Apr 14, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/066
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A semiconductor integrated circuit device comprises a reference voltage generating circuit for transforming a power-supply voltage at multiple levels on the basis of a voltage specifying signal outputted from a CPU, a driving voltage generating circuit to which a reference voltage generated from the reference voltage generating circuit is given, and a liquid-crystal display control circuit for outputting a driving signal for driving a liquid-crystal display panel when the voltage generated from the driving voltage generating circuit is given. Since the device of the present invention can perform the contrast control based on the above voltage specifying signal, it becomes unnecessary to provide an additional contrast control circuit outside the device, unlike the conventional device. Moreover, with the constitution which enables an output voltage of the above reference voltage generating circuit to be provided to the outside, the device of the present invention becomes more versatile with respect to various products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.