The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 02, 1996
Filed:
Apr. 14, 1995
Yoshiyuki Ishimaru, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
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.