Television – Image signal processing circuitry specific to television – Display controlled by ambient light
Reexamination Certificate
1998-07-09
2001-05-08
Lee, Michael (Department: 2614)
Television
Image signal processing circuitry specific to television
Display controlled by ambient light
C348S603000, C348S604000, C348S607000, C348S227100
Reexamination Certificate
active
06229577
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to ambient light-dependent video-signal processing, and to a display apparatus featuring ambient light-dependent video-signal processing.
2. Description of the Related Art
PCT International Application No. WO-A-94/18,790 discloses an environment-dependent automatic luminance control for display screens, providing the possibility of automatically and continuously adjusting the luminance of the display screen to the average luminance in the user's field of view. The display screen is coupled to an external light sensor which can be placed individually anywhere in the room and is adjusted in such a way that the spatial angle covered roughly corresponds to the user's field of view. An electronic control built into the display or connectable thereto via an interface ensures that the brightness, contrast or background illumination of the display screen is adjusted so that the luminance of the display screen is in the best possible relationship with the average luminance in the field of view.
SUMMARY OF THE INVENTION
It is, inter alia, an object of the invention to provide a better ambient light-dependent video-signal processing. To this end, a first aspect of the invention provides an ambient light-dependent video-signal processing method comprising the steps of measuring an amount of ambient light to obtain a measured amount of ambient light; and processing a video signal in dependence upon said measured amount of ambient light; wherein said processing step includes the steps of substantially immediately processing said video signal when there is a large change in said measured amount of ambient light; and delaying processing said video signal until an occurrence of a scene change in said video signal when there is a small change in said measured amount of ambient light.
A second aspect of the invention provides an ambient light-dependent video-signal processing device comprising means for measuring an amount of ambient light to obtain a measured amount of ambient light; and means for processing a video signal in dependence upon said measured amount of ambient light; wherein said processing means includes means for substantially immediately processing said video signal when there is a large change in said measured amount of ambient light; and means for delaying processing said video signal until an occurrence of a scene change in said video signal when there is a small change in said measured amount of ambient light.
A third aspect of the invention provides a display apparatus comprising an ambient light-dependent video-signal processing device as described above; and a display device for displaying the video signal processed by the ambient light-dependent video-signal processing device.
In a method of ambient light-dependent video-signal processing in accordance with a primary aspect of the present invention, the method comprising the steps of measuring an amount of ambient light to obtain a measured amount of ambient light, and processing a video signal in dependence upon the measured amount of ambient light, the video signal is substantially immediately processed when there is a large change in the measured amount of ambient light, while the video signal is delayed being processed until an occurrence of a scene change in the video signal when there is a small change in the measured amount of ambient light.
It is to be noted that PCT International Application No. WO-A-90/06035 corresponding to U.S. Pat. No. 5,087,973, discloses a picture receiver controller in which data signals are subjected to an operation in such a way that a noise reduction control signal is outputted in conformity with a noise level introduced during transfer or storing, further comprising means for updating the noise reduction control signal in synchronism with a scene change of an input image, so that a smooth noise reduction control can be performed when a detected noise level is quantized and controlled synchronously with a detected scene changing state. This document does not teach that the video signal is substantially immediately processed when there is a large change in the measured amount of ambient light, while the video signal is delayed being processed until an occurrence of a scene change when there is a small change in the measured amount of ambient light.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
REFERENCES:
patent: 3165582 (1965-01-01), Korda
patent: 3814852 (1974-06-01), Mierzwinski
patent: 4181915 (1980-01-01), Lagoni
patent: 5087973 (1992-02-01), Kawahara
patent: 5532848 (1996-07-01), Beretta
patent: 5537071 (1996-07-01), Jaspers
patent: 5734746 (1998-03-01), Jaspers
patent: 5754682 (1998-05-01), Katoh
patent: 5757438 (1998-05-01), Yoon et al.
patent: 5831686 (1998-11-01), Beretta
patent: WO9006035 (1990-05-01), None
patent: WO9418790 (1994-08-01), None
Barth Paul J.
Nieuwenhuizen Michel W.
Desir Jean W.
Goodman Edward W.
Lee Michael
U.S. Philips Corporation
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