US4942458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color liquid crystal display apparatus
Assignee: Citizen Watch Co Ltd
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Filing: 1990-02-20
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Granted: 1990-07-17
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Expires: 2010-02-20
Abstract
Abstract A color liquid crystal display apparatus includes a receiver, a color separation circuit, A/D converters, a liquid crystal panel, and an adjusting section. The receiver receives an external radio wave and outputs a video signal. The color separation circuit color-separates the video signal and outputs red, green, and blue video output signals. The A/D converters A/D-convert the red, green, and blue video output signals. The liquid crystal panel having a plurality of pixels formed therein displays an image on the basis of outputs from the A/D converters. The adjusting section can independently adjust at least one of low and high reference potentials used as references for A/D conversion by the A/D converters.
Inventors
- 👤 Akira Miyajima
- 👤 Atushi Shiraishi
- 👤 Yasuyuki Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:12
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/73; H04N9/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
144 words
An apparatus for adjusting color balance to match the characteristics of a color liquid crystal display comprising: a receiver for receiving an external radio wave and outputting a video signal; a color separation circuit for color-separating the video signal and outputting red, green, and blue video output signals; a separate A/D converter for A/D-converting each of the separate red, green, and blue video output signals and outputting separate red, green, and blue digital output signal; a liquid crystal panel, having a plurality of pixels formed therein, for displaying an image on the basis of the red, green, and blue digital output signals generated by each said A/D converter; and adjusting means which can independently adjust both the low and high reference potentials used as references for A/D conversion of each of the red, green, and blue video output signals by each said A/D converter.
Claim 2
Independent Claim
144 words
An apparatus for adjusting color balance to match the characteristics of a color liquid crystal display comprising: a receiver for receiving an external radio wave and outputting a video signal; a color separation circuit for color-separating the video signal and outputting red, green, and blue video output signals; a separate A/D converter for A/D-converting each of the separate red, green, and blue video output signals and outputting separate red, green, and blue digital output signal; a liquid crystal panel, having a plurality of pixels formed therein, for displaying an image on the basis of the red, green, and blue digital output signals generated by each said A/D converter; and adjusting means which can independently adjust both the low and high reference potentials used as references for A/D conversion of each of the red, green, and blue video output signals by each said A/D converter.
Claim 3
Dependent Claim
31 words
An apparatus according to claim 1, wherein said adjusting means is capable of continuously changing both of the reference potentials for each of the red, green, and blue video output signals.
Claim 4
Dependent Claim
24 words
An apparatus according to claim 2, wherein said adjustment means comprises a circuit including a separate variable resistor for each of the reference potentials.
Claim 5
Dependent Claim
21 words
An apparatus according to claim 1, wherein one of the high and low reference potentials of said A/D converter is constant.
Claim 6
Dependent Claim
33 words
An apparatus according to claim 1, wherein said liquid crystal panel forms said plurality of pixels for a matrix display by using a plurality of signal electrodes and a plurality of scanning electrodes.
References Cited (Backward Citations)
US4581654A
Cited
US4745461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |