US4694349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal matrix display panel driver circuit
Assignee: Sharp Corp
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Filing: 1985-05-31
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Granted: 1987-09-15
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Expires: 2005-05-31
Abstract
Abstract A driver circuit for a matrix-type liquid crystal display panel capable of displaying pictures having the same number of scan lines as a conventional television set without using a frame memory, by applying the mean value of two video signals matching the 1-H advance and 1-H behind odd (even) numbered scan lines, where the video signal in the odd (even) field correctly matches the even (odd) numbered scan lines.
Inventors
- 👤 Makoto Takeda
- 👤 Kunihiko Yamamoto
- 👤 Nobuaki Matsubayashi
- 👤 Hiroshi Take
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:57
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3685; G09G3/3688; H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/127; G09G3/2007; G09G3/2011
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
162 words
A TV picture display unit comprising: a liquid crystal matrix display panel for displaying a picture from a plurality of television video signals corresponding to successive scan lines of a television picture frame; and driver circuit means for driving said matrix display panel with signals corresponding to said video signals, including, means for sampling video signals corresponding to alternate scan lines of said frame to provide successfully sampled signals, means for storing at least first and second successively sampled signals, means for forming a signal defining the mean value of said stored first and second successively sampled signals, and means for sequentially applying said stored first sampled signal, said mean value signal, and said stored second sampled signal to said matrix display panel corresponding to said successive scan lines of said television picture frame, said means for storing substituting each successively sampled signal for the oldest signal stored therein, said mean value signal corresponding to a scan line between successively sampled signals.
Claim 2
Dependent Claim
162 words
A TV picture display unit comprising: a liquid crystal matrix display panel for displaying a picture from a plurality of television video signals corresponding to successive scan lines of a television picture frame; and driver circuit means for driving said matrix display panel with signals corresponding to said video signals, including, means for sampling video signals corresponding to alternate scan lines of said frame to provide successfully sampled signals, means for storing at least first and second successively sampled signals, means for forming a signal defining the mean value of said stored first and second successively sampled signals, and means for sequentially applying said stored first sampled signal, said mean value signal, and said stored second sampled signal to said matrix display panel corresponding to said successive scan lines of said television picture frame, said means for storing substituting each successively sampled signal for the oldest signal stored therein, said mean value signal corresponding to a scan line between successively sampled signals.
Claim 3
Dependent Claim
36 words
The display unit of claim 1, wherein said means for storing and means for forming comprise a plurality of capacitors connected in parallel with each other and in circuit with an input for said video signals.
Claim 4
Dependent Claim
51 words
The display unit of claim 1, wherein said means for sampling samples even numbered scan line signals during a first period, and odd numbered scan line signals during a second period, said first and second periods each being equal to one-half the period of an entire frame of scan line signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-14 | 1991-03-16 | 1991-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-14 | 1995-03-16 | 1995-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-14 | 1999-03-16 | 1999-09-15 | $7700.00 | Window Closed / Lapsed |