Focussing adjustment changeover circuit for projection tv...

Details Focussing adjustment changeover circuit for projection tv... Focussing adjustment changeover circuit for projection tv...

H - Electricity

04

N

350/98

H04N 5/74 (2006.01)

Patent

CA 1304815

ABSTRACT OF THE DISCLOSURE A focus adjustment changeover circuit for a projection display television receiver having red, green and blue-emission CRTs includes a changeover switch for selecting an operating mode in which a level of current is supplied to the static focus coil of the blue-emission CRT such as to precisely focus the electron beam of that CRT, so that projection lens focus adjustment for that CRT can be easily performed with a test pattern signal being projected, and an operating mode in which the current supplied to that static focus coil causes the electron beam of the blue CRT to be slightly defocused, so that white balance adjustment of the television receiver can be executed while a television picture is projected.

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