Image signal processing apparatus and method and image display apparatus and method
US7218316B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 23, 2004 |
| Grant date | May 15, 2007 |
| Priority date | — |
| Expiry date | Oct 20, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To provide a bright, high-image-quality image display apparatus, in an overlap scanning mode in which two scan-wiring lines are selected simultaneously in each horizontal scanning period, high-frequency emphasis filtering is performed on a video signal so that a gain at a spatial frequency corresponding to ½ of a vertical critical resolution is within the range of 0 dB to +6 dB. It is even preferable that a gain of this high-frequency emphasis filtering at a spatial frequency corresponding to 7/10 of the vertical critical resolution be higher than or equal to +3 dB. For example, this high-frequency emphasis filtering can be implemented by a 3-tap FIR filter having filter coefficients (h1, h2, h3)=(−x/2, 1+x, −x/2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.