Cathode ray tube and apparatus and method of controlling brightness
AssigneeSony Corporation
InventorsSatoru Nakanishi, Yasunobu Kato, Masamichi Okada
Life of this patent
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Abstract
A control portion detects a level of video signals for each color when video signals are inputted from a frame memory to DSP circuits. Next, the control portion calculates an appropriate correction coefficient of each color to be used in modulation control of brightness, for every unit pixel or unit pixel array among a plurality of correction coefficients stored in its own memory in advance based on the detected signal level. The control portion instructs the DSP circuits to perform modulation of brightness by using the determined correction coefficient.
Claims13
A cathode ray tube for performing color image display by forming a single screen by joining a plurality of divided screens being formed by scanning of the plurality of electron beams by partially overlapping each other, comprising:
- a signal dividing means for dividing an inputted video signal into a video signal for the plurality of divided screens;
- a storage means for storing a plurality of correction coefficient for each color corresponding to a plurality of signal levels;
- a signal level detection means for detecting a signal level of an input video signal for each color;
- a calculating means for calculating an appropriate correction coefficient for each color to be used for modulation control of brightness among a plurality of correction coefficient stored in the storage means on the basis of the signal level detected by the signal level detection means;
- a brightness modulation means for performing control corresponding to a signal level on each of the plurality of video signals for a divided screen so that the sum total of brightness at the same pixel position in an overlapped region on the screen, scanned on the basis of the plurality of video signals for the divided screens, equals to brightness at the same pixel position on an original image by using a correction coefficient for each color calculated through the calculating means;
- and
- a plurality of electron guns for emitting a plurality of electron beams, which scans said plurality of divided screens based on a video signal where modulation control has been performed by said brightness modulation means.
An apparatus for controlling brightness for performing brightness control of an image displayed in an image display device, which forms a single screen by joining a plurality of divided screens by partially overlapping each other, wherein the apparatus for controlling brightness comprises:
- a signal level detection means for detecting a signal level of an inputted video signal for divided screen;
- a storage means for storing a plurality of correction coefficient corresponding to a plurality of signal levels;
- a calculating means for calculating an appropriate correction coefficient to be used for modulation control of brightness among a plurality of correction coefficient stored in the correction coefficient storage means;
- and
- a brightness modulation means for performing control corresponding to a signal level on each of the plurality of video signals for a divided screen so that the sum total of brightness at the same pixel position in an overlapped region on the screen, which is scanned on the basis of the plurality of video signals for the divided screen, equals to brightness at the same pixel position on an original image by using a correction coefficient for each color calculated through the calculating means.
A method for controlling brightness for performing brightness control of an image displayed in an image display device, which forms a single screen by joining a plurality of divided screens by partially overlapping each other, wherein the method for controlling brightness comprises steps of:
- detecting a signal level of an inputted video signal;
- storing a plurality of correction coefficients corresponding to a plurality of signal levels in a storage means;
- calculating an appropriate correction coefficient to be used for modulation control of brightness, among a plurality of correction coefficients stored in the storage means;
- and
- performing modulation control of brightness corresponding to a signal level on each of the plurality of video signals for a divided screen so that the sum total of brightness at the same pixel position in an overlapped region on the screen, which is scanned based on the plurality of video signals for the divided screens, equals to brightness at the same pixel position on an original image by using the calculated.
Dependencies are inferred from the claim text.