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EP0150991A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Video display apparatus

Assignee: Sony Corp
•
Filing: 1985-01-24
•
Granted: —
•
Expires: 2005-01-24
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Abstract

Abstract A video display apparatus includes a display device including a plurality of display cells (201 to 224, etc.) arranged in an X-Y matrix form, a video signal source (101 to 106) for supplying a digital video signal, a pulse width modulator (131 to 134, etc.) connected to the video signal source (101 to 106) for deriving a pulse width modulated signal corresponding to the brightness level of the digital video signal. The pulse width modulator (101 to 106) includes a counter (133) supplied with the digital video signal as a datum signal and a clock signal generator (501) for supplying a clock signal to the counter (133), and a signal supplying circuit (113) connected to the pulse width modulator (101 to 106) for supplying the pulse width modulated signal to the display device and reproducing a picture thereon. A control circuit (116) is connected to the clock signal generator (501) for changing the frequency of the clock signal supplied to the counter (133) to control the brightness of the picture reproduced on the display device.

Inventors

  • 👤 Yuji C/O Sony Corporation Watanabe
  • 👤 Yasuyuki C/O Sony Corporation Endoh

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 02:11
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/66; G; G09; G09G; G09G3/00; G09G3/20; G09G3/2007; G09G3/2014; G06; G06F; G06F3/00; G06F3/14; G06F3/1423; G06F3/1446; H04N3/00; H04N3/10; H04N3/12; H04N3/122; G09G5/00; G09G5/003; G09G5/006

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 176 words
A video display apparatus comprising: a display device including a plurality of display cells (201 to 224, etc.) arranged in an X-Y matrix form; a video signal source (101 to 106) for supplying a digital video signal; a pulse width modulator (131 to 134, etc.) connected to said video signal source (101 to 106) for deriving a pulse width modulated signal corresponding to the brightness level of said digital video signal, said pulse width modulator (131 to 134, etc.) including a counter (133) supplied with said digital video signal as a datum signal and a clock signal generator (501) for supplying a clock signal to said counter (133); and signal supplying means (113) connected to said pulse width modulator (131 to 134, etc.) for supplying said pulse width modulated signal to said display device and reproducing a picture thereon; characterized by: control means (116) connected to said clock signal generator (501) for changing the frequency of the clock signal supplied to the counter (133) to control the brightness of the picture reproduced on said display device.
Claim 2
Dependent Claim 176 words
A video display apparatus comprising: a display device including a plurality of display cells (201 to 224, etc.) arranged in an X-Y matrix form; a video signal source (101 to 106) for supplying a digital video signal; a pulse width modulator (131 to 134, etc.) connected to said video signal source (101 to 106) for deriving a pulse width modulated signal corresponding to the brightness level of said digital video signal, said pulse width modulator (131 to 134, etc.) including a counter (133) supplied with said digital video signal as a datum signal and a clock signal generator (501) for supplying a clock signal to said counter (133); and signal supplying means (113) connected to said pulse width modulator (131 to 134, etc.) for supplying said pulse width modulated signal to said display device and reproducing a picture thereon; characterized by: control means (116) connected to said clock signal generator (501) for changing the frequency of the clock signal supplied to the counter (133) to control the brightness of the picture reproduced on said display device.
Claim 3
Dependent Claim 70 words
A video display apparatus according to claim 1 wherein said control means (116) comprises a plurality of frequency dividers (502 to 505, 508, 509, 510 to 512) connected in cascade with said clock signal generator (501) and switching means (507) for selecting an output from one of said frequency dividers (502 to 505, 508, 509, 510 to 512) and supplying said output to said counter (133) as a clock signal.
Claim 4
Dependent Claim 19 words
A video display apparatus according to claim 1 wherein said counter (133) counts down the clock signal supplied thereto.
Claim 5
Dependent Claim 54 words
A video display apparatus acording to claim 3 wherein said pulse width modulator (131 to 134, etc.) further comprises latching means (506) for latching the digital video signal supplied from said video signal source (101 to 106), and means for supplying the latched video signal to said counter (133) as a preset datum thereof.
Claim 6
Dependent Claim 36 words
A video display apparatus according to claim 1 wherein said video signal source (101 to 106) comprises an analog to digital converter circuit (106) for converting an input analog video signal to a digital video signal.

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