The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 1995
Filed:
Nov. 16, 1993
Hendrik Ten Pierick, Eindhoven, NL;
Jan G Prummel, Zierikzee, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
To improve the sharpness of (video) pictures to be displayed on a display screen of a display device, it is known to use scan velocity modulation. The drawback of scan velocity modulation is that an improvement of the (impression of) sharpness is obtained in given types of video signal/pictures only. By starting from the properties of the display tube when improving the (impression of) sharpness of the displayed picture, a much better improvement can be obtained. Information about the relevant display tube is applied to a correction circuit which also receives a video signal-dependent signal. With reference to these input signals, the correction circuit determines whether and how the video signal is to be corrected so as to obtain an ideal picture on the display screen. Reducing the contrast is a first step of restoring the resolution. Modulating the read clock of the video signal is a second step. Using scan velocity modulation is the last step. The correction circuit determines/computes one clock signal which is applied to a contrast control circuit, a clock modulator and a scan velocity modulator, respectively.