EP0181174A2
Expired / Lapsed
EP
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A matrix-addressed display device
Assignee: Toshiba Corp
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Filing: 1985-11-01
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Granted: —
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Expires: 2005-11-01
Abstract
Abstract The invention is directed to a matrix-addressed display device having a matrix-addressed display element such as a liquid crystal element. The device comprises a sampling frequency generator generating sampling frequency signals. By the sampling frequency signals, the serially input video signals are sampled, held and consequently converted serial to parallel. The sampling frequency generator is provided with means for stopping the sampling frequency signal in periods when serial-parallel conversion is not required.
Inventors
- 👤 Koichi C/O Patent Division Kasahara
- 👤 Akira C/O Patent Division Saito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 10:38
CPC Classifications
G; G09; G09F; G09F9/00; H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/127
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
71 words
A matrix-addressed display device comprising: a sampling frequency signal generator (71); means (72) for sampling a serially input video signal in acordance with the sampling frequency signal; means for holding the sampled signal and converting it from serial to parallel; and picture display means (1) utilizing the serial-parallel converted signal; characterised by means for suspending operation of said sampling frequency signal generator in periods wherein said serial-parallel conversion is not required.
Claim 2
Dependent Claim
71 words
A matrix-addressed display device comprising: a sampling frequency signal generator (71); means (72) for sampling a serially input video signal in acordance with the sampling frequency signal; means for holding the sampled signal and converting it from serial to parallel; and picture display means (1) utilizing the serial-parallel converted signal; characterised by means for suspending operation of said sampling frequency signal generator in periods wherein said serial-parallel conversion is not required.
Claim 3
Dependent Claim
27 words
A matrix-addressed display device according to claim 1, wherein said sampling frequency generator is provided with a gated oscillator employing a logic gate and performing free-running oscillation.
Claim 4
Dependent Claim
82 words
A matrix-addressed display device according to claim 2, wherein said sampling frequency generator comprises a horizontal counter, and said gated oscillator starts oscillation with a timing related to a horizontal synchronizing signal that is either contained in said input video signal or separately input, the output pulses produced by the oscillation being counted by said horizontal counter and oscillation being stopped at the time-point when a number of pulses related to the number of pixels in the horizontal direction has been output.
Claim 5
Dependent Claim
102 words
A matrix-addressed display device according to claim 3, wherein said sampling frequency generator comprises a vertical counter, and said gated oscillator starts oscillation with a timing related to said horizontal synchronizing signal and vertical synchronizing signal, either contained in said input video signal or separately input, and stops said oscillation, that was started with a timing related to said horizontal synchronizing signal, when a count, obtained by counting said horizontal synchronizing signal from this time-point by means of said vertical counter, has been reached that is related to the number of pixels in the vertical direction, the process being carried out repetitively.
References Cited (Backward Citations)
No citation records indexed.
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