Invention Patent
- Patent Title: METHOD FOR DRIVING LCD AND APPARATUS FOR DRIVING LCD AND LCD APPARATUS
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Application No.: CA2065981Application Date: 1992-04-14
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Publication No.: CA2065981A1Publication Date: 1992-11-16
- Inventor: IKEZAKI MITSURU , SUZUKI SHUNJI , TAKANO HIDEO
- Applicant: IBM
- Assignee: IBM
- Current Assignee: IBM
- Priority: JP13866891 1991-05-15
- Main IPC: G02F1/133
- IPC: G02F1/133 ; G09G3/20 ; G09G3/36
Abstract:
JA9-91-007 METHOD FOR DRIVING LCD AND APPARATUS FOR DRIVING LCD AND LCD APPARATUS To provide a liquid crystal display apparatus that simultaneously satisfies both good contrast ratios and good gradation at large viewing angles. A liquid crystal display apparatus in normally-white mode in which gray scale displaying is obtained by providing different applied voltages corresponding to different gray scale levels, respectively, is characterized in that, in a curve showing the relation between an applied voltage and light transmittance ( V-T curve ) the lowest applied voltage is set so as to be shifted in the direction of a monotonously decreasing area of the V-T curve. By shifting the lowest applied voltage in the V-T curve in the direction of a monotonously decreasing area of the V-T curve, brightness or gradation is prevented from being inverted. A liquid crystal display apparatus in normally-white mode in which gray scale displaying is obtained by providing different applied voltages corresponding to different gray scale levels, respectively, characterized in that in a curve showing the relation between the an applied voltage and light transmittance (thereafter called V-T curve) the lowest applied voltage is set so as to be shifted in the direction of a monotonously decreasing area of the V-T curve. By shifting the lowest applied voltage in the V-T curve in the direction of a monotonously decreasing area of the V-T curve, brightness or gradation is prevented from being inverted.
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