Projection TV set with parity error checking
A TV and projection technology, applied in the direction of using projection device image reproducer, cathode ray tube indicator, instrument, etc., can solve the problems of correction value corruption, unsatisfactory convergence correction, etc.
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[0021] FIG. 1 a shows a plan view from the front of a screen 1 of a television set according to the invention, on which images are projected from three monochrome picture tubes 2 , 3 and 4 . As shown, the kinescopes 2-4 are geometrically arranged differently. Therefore, the imaging errors appearing on the screen are different for each picture tube. These image errors are corrected by means of additional correction coils which are mounted in front of the actual deflection yoke, on the coil neck of the picture tube. For each picture tube 2-4, correction is performed both horizontally and vertically, that is to say there are a total of six correction coils with associated driver circuits in the television, each of which is activated by a converging circuit. The correction coils with associated circuitry are called convergence channels, so that the television has a total of six convergence channels.
[0022] Figure 1b Again showing the effect of the convergence correction in bl...
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