| 摘要 |
PCT No. PCT/JP79/00006 Sec. 371 Date Aug. 24, 1979 Sec. 102(e) Date Aug. 24, 1979 PCT Filed Jan. 11, 1979 PCT Pub. No. WO80/00518 PCT Pub. Date Mar. 20, 1980. It is demanded to make the convergence correction of color cathode ray tubes a high accuracy. The problems of the color mis-register on color cathode ray tubes cause a bottleneck in this demand. Instead of conventional convergence circuits based on passive elements (L, C, R etc.), the present invention realizes a high accuracy convergence circuit having active elements (transistors and the like) introduced thereinto. Namely, it is characterized in that, by comparing square signal voltages produced from an X and a Y deflecting signal voltage with some reference voltages, a picture surface of a cathode ray tube is partitioned into a central portion and a peripheral portion (the upper/lower and left/right ends,) and the individual portions can be separately adjusted.
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