Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1982-07-21
1983-12-20
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315387, 358 60, H01J 2956
Patent
active
044220200
ABSTRACT:
A system for correcting for vertical off-axis optical projection distortions in a projection television is disclosed. In a projection television wherein the image projection axis is obliquely disposed in the vertical direction relative to the projection screen axis, a system for correcting for video image distortion caused by this configuration involving modulating the vertical size input is disclosed. A vertical rate correction signal is developed from the vertical output circuit and provided in a feedback arrangement to a sawtooth wave signal generating circuit for regulating electron beam vertical sweep in a projection television CRT, or CRT's. By decreasing CRT electron beam vertical sweep rate across that portion of the projection screen where the video image is vertically stretched and increasing the vertical sweep rate for the vertically compressed portion of the video image, a linear, distortion-free image is presented on the projection screen.
REFERENCES:
patent: 3488554 (1970-01-01), Voige
patent: 3996611 (1976-12-01), Toone
patent: 4198591 (1980-04-01), Ohmori
Ankeny Donald
Lehnert Stanley E.
Blum Theodore M.
Zenith Radio Corporation
LandOfFree
Vertical image correction for projection TV does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vertical image correction for projection TV, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vertical image correction for projection TV will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-109605