EP0436384A2
Expired / Lapsed
EP
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A driving circuit for a liquid crystal display apparatus
Assignee: Sharp Corp
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Filing: 1990-12-24
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Granted: —
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Expires: 2010-12-24
Abstract
Abstract In a driving circuit for a liquid crystal apparatus, a DC offset voltage the level of which changes depending upon the level of input video signals is applied input video signal. The DC voltage which appears in the liquid crystal and the level of which changes depending upon the level of input video signals can be completely compensated.
Inventors
- 👤 Ryuji Hashimoto
- 👤 Shigeaki Mizushima
- 👤 Eiichiro Nishimura
- 👤 Shigehiro Minezaki
- 👤 Toshio Takemoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 16:25
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3614; G09G3/3648; G09G2320/00; G09G2320/02; G09G2320/0204; G09G2320/0219; G09G2360/00; G09G2360/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
55 words
In a driving circuit for a liquid crystal display apparatus, said driving circuit comprises: offset means for generating an offset voltage, the level of said offset voltage corresponding the level of an input video signal; and adding means for adding said offset voltage to an output video signal output toward said liquid crystal display apparatus.
Claim 2
Dependent Claim
27 words
A driving circuit according to claim 1, wherein said driving circuit further comprises a polarity-inverting circuit, and said output video signal is output from said polarity-inverting circuit.
Claim 3
Dependent Claim
55 words
A driving circuit according to claim 1, wherein said offset means comprises: voltage detection means for detecting the level of the input video signal; voltage source for supplying different-level voltages; and selection means for selecting one of said different-level voltages as said offset voltage, in accordance with said detected level of the input video signal.
Claim 4
Dependent Claim
66 words
A driving circuit for driving a liquid crystal display device in accordance with an input video signal and including polarity inversion means (1) for converting the drive signals into A.C. form, characterised in that bias means (2) for introducing a D.C. offset into the drive signals is adapted to vary the magnitude of the D.C. offset in accordance with the level of the input video signal.
References Cited (Backward Citations)
No citation records indexed.
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