Television receiver on-screen alphanumeric display

Details Television receiver on-screen alphanumeric display Television receiver on-screen alphanumeric display

H - Electricity

04

N

350/3

H04N 9/16 (2006.01) H04N 5/45 (2006.01) H04N 9/64 (2006.01)

Patent

CA 1171956

-18 - RCA 76,194 ABSTRACT OF THE DISCLOSURE A color television receiver circuit arrangement is disclosed for facilitating the on-screen kinescope display of alphanumeric information. The receiver includes plural video output kinescope driver stages, a source of black-level reference bias voltage to which video signals amplified by the kinescope driver stages are normally referenced, and a source of control signals representative of the alphanumeric information. During picture intervals when alphanumeric information is to be displayed on a given area of the kinescope screen, the normal video signal and video driver outputs are blanked, and the control signal is employed to modify the kinescope driver black level reference bias voltage in a white level direction. The modified reference bias is sufficient to unblank the video driver outputs so that the kinescope is caused to conduct a white level signal corresponding to the alphanumeric information, which is then displayed by the kinescope.

390356

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