North American Philips Corporation

Stephen T Troemel

William F Guerinot

Ralph H Bradley, Jr

Larry D Johnson

Cuong V Luu

A circuit for horizontally displaying a first standard aspect-ratio television picture and a reduced-size second standard aspect-ratio television picture on a wide aspect-ratio television display includes a first and a second video signal supply and a circuit for selecting one of the video signals as the first standard aspect-ratio television picture and the other of the video signals as the second standard aspect-ratio television picture. The video signal for the first standard aspect-ratio television picture is then time compressed while the video signal for the second standard aspect-ratio television picture is initially sub-sampled to reduce the size of the resulting television picture and is then time compressed. These two compressed video signals are then selectively applied to the wide aspect-ratio television display so that the reduced-size second standard aspect-ratio television picture appears beside the first standard aspect-ratio television picture.

Picture out of picture feature for wide-screen display

A circuit for correcting raster distortion on a CRT display screen. Horizontal distortion is corrected by overscanning and providing complementary modification of the time delay and data rate at which digital video data is supplied to the CRT during each scanning line. The video data for a given scanning line is stored in a line store, read-out therefrom being controlled by a microprocessor programmed to determine the necessary time delay and data rate of such read-out. Vertical distortion, affecting scanning lines in the vicinity of the top and bottom of the raster, is corrected by storing in a multiline store the video data for all such scanning lines. The same or a further microprocessor is programmed to re-assign the video data for pixels on each of such lines to vertically corresponding pixels on others of the scanning lines, such re-assignments being complementary to the vertical distortion of the original scanning lines.

CRT raster distortion correction circuit

A wide screen television monitor capable of displaying standard width picture in which uneven 'Coulomb aging' is minimized. The television monitor includes circuitry for causing the standard width picture to cyclically traverse the width of the display screen of the television monitor in accordance with a prescribed function. The period of repetition of this movement is of such a duration that a casual observer of the television monitor is unaware of the movement of the picture.

Growing community of inventors

Jefferson City, TN, United States of America

Stephen T Troemel