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US5214418A
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US
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Liquid crystal display device
Assignee: Mitsubishi Electric Corp
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Filing: 1989-09-05
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Granted: 1993-05-25
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Expires: 2009-09-05
Abstract
Abstract A liquid crystal display device for image display realizing clear and optimum image display by comprising a brightness detector for detecting brightness of image signal after digital conversion and a voltage dividing circuit for outputting the reference voltage in the level depending on the detected value in view of adjusting contrast of display screen by judging brightness of image signal and controlling the reference voltage.
Inventors
- 👤 Kenichiro Fukumura
- 👤 Kazuo Yoshioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:52
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/127; G09G2320/00; G09G2320/06; G09G2320/066; G09G3/3611; G09G3/3696
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A liquid crystal display device having a color demodulator for demodulating an input color image signal to three primary-color signals, an analog/digital converter for quantizing the color image signal demodulated by said color demodulator to a digital signal and a signal processing circuit for processing the quantized digital signal and supplying it to a driving circuit for image display, said liquid crystal display device comprising a brightness detector for detecting a brightness level of the image signal depending on a most significant bit output only, from said analog/digital converter through quantization, and a voltage dividing circuit for inputting a reference voltage of a level depending on a detected value of said brightness detector to said analog/digital converter for a specified period, and further comprising a capacitor for providing a reference voltage indicating brightness of a predetermined level when the brightness level of the image signal detected by said brightness detector is dark.
Claim 2
Dependent Claim
152 words
A liquid crystal display device having a color demodulator for demodulating an input color image signal to three primary-color signals, an analog/digital converter for quantizing the color image signal demodulated by said color demodulator to a digital signal and a signal processing circuit for processing the quantized digital signal and supplying it to a driving circuit for image display, said liquid crystal display device comprising a brightness detector for detecting a brightness level of the image signal depending on a most significant bit output only, from said analog/digital converter through quantization, and a voltage dividing circuit for inputting a reference voltage of a level depending on a detected value of said brightness detector to said analog/digital converter for a specified period, and further comprising a capacitor for providing a reference voltage indicating brightness of a predetermined level when the brightness level of the image signal detected by said brightness detector is dark.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |