US Patent No: 5,038,139
Number of patents in Portfolio can not be more than 2000
Half tone display driving circuit for crystal matrix panel and half tone display method thereof
Stats
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Aug 6, 1991
Issued date -
Aug 18, 1989
filing date -
07/395,595
serial no -
Expired
status
Importance
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Abstract
In a half tone display driving circuit for a liquid crystal matrix panel, a pulse for half tone display is phase modulated so that pulse signals which are out of phase relative to each other are applied to adjacent columns of the liquid crystal matrix panel, or from the phase-modulated pulse a gray scale pulse (tone pulse) is prepared in which the frequency of occurrence of voltage edges is decreased. The dephased pulse signals or the gray scale pulse (tone pulse) is used to prevent a decrease in brightness of display when the liquid crystal matrix panel is driven for half tone display.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,795,239 Method of driving a display panel | 41 | 1986 | |
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| 4,775,891 Image display using liquid crystal display panel | 53 | 1985 | |
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| 4,748,510 Drive circuit for liquid crystal display device | 29 | 1987 | |
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| 4,743,096 Liquid crystal video display device having pulse-width modulated "ON" signal for gradation display | 77 | 1987 | |
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| 4,511,926 Scanning liquid crystal display cells | 43 | 1983 | |
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| 4,857,906 Complex waveform multiplexer for liquid crystal displays | 21 | 1987 | |
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| 4,779,083 Display control system | 46 | 1986 | |
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| 4,859,998 Apparatus and method for driving signal electrodes for liquid crystal display devices | 19 | 1988 | |