US 7,224,350 B2Granted

Video display apparatus and video display method

AssigneeSony Corporation

InventorsShigeru Takasu, Motosuke Irie

Life of this patent

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Abstract

An image display device well suited for a multi-scanning type monitor includes a video signal measurement circuit that detects a horizontal synchronization frequency fH and a vertical synchronization frequency fV from an input image signal that conforms to the GTF Standard. A main control portion calculates timing data relative to a waveform of the signal (21) using the frequencies fH and fV, calculates adjustment parameters for adjusting a size and a position using this timing data, and sets the adjustment parameters to deflection control circuits, so that an image of the image signal may be displayed well on a CRT. Since the timing data is calculated using the synchronization frequencies fH and fV of the input image signal, it is possible to save on a memory capacity without storing timing data that corresponds to a plurality of different kinds of image signals.

Claims2

Dependent claims

An image display device comprising:

image display means for displaying an image of an input image signal;
detection means for detecting a horizontal synchronization frequency and a vertical synchronization frequency of said input image signal;
storage means for storing predetermined adjustment parameters in cross-reference to respective pairs of frequencies, each pair of frequencies including a predetermined horizontal synchronization frequency and a predetermined vertical synchronization frequency;
decision means for determining whether the horizontal synchronization frequency and vertical synchronization frequency detected by said detection means matches one of said pairs of frequencies;
and
control means for controlling display of said image by said display means,
wherein when said decision means determines that the horizontal synchronization frequency and vertical synchronization frequency detected by said detection means matches one of said pairs of frequencies, said control means controls display of said image by said display means based on the predetermined adjustment parameter that is cross-referenced to said matching pair of frequencies, and
wherein when said decision means determines that the horizontal synchronization frequency and vertical synchronization frequency detected by said detection means does not match one of said pairs of frequencies, said control means calculates timing data relative to a waveform of said input image signal using the horizontal synchronization frequency and vertical synchronization frequency detected by said detection means, calculates an adjustment parameter based on the calculated timing data, and controls said display of said image by said display means based on the calculated adjustment parameter.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/479,333Filed 27 Jun 2002
Priority: JP 2001-19546527 Jun 2001
Published: US 2005/0140701 A130 Jun 2005
Granted: 29 May 2007
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H04N 3/27
By deflecting electron beam in cathode-ray tube , e.g. scanning corrections: circuits special to multi-standard receivers
H04N 3/223
Circuits for controlling dimensions, shape or centering of picture on screen: controlling dimensions
H04N 3/227
Circuits for controlling dimensions, shape or centering of picture on screen: centering
H04N
Pictorial communication