| 摘要 |
PURPOSE:To obtain a well bisymmetrical convergence characteristic in the peripheral part of the screen, by providing a phase correcting circuit between a drive circiut and the cathode terminal of a color picture tube to make phases of red, green, and blue drive signals coincident with one another. CONSTITUTION:Color difference signals R-Y, G-Y, and B-Y are inputted to red, green, and blue drive circuits 10-12, respectively and a luminance signal Y is inputted to these circuits 10-12 also. If the phase of the green drive signal is later than that of red and blue drive signals, the red drive circuit 10 and the blue drive circuit 12 are connected to a red cathode KR and a blue cathode KB of a color picture tube 13 but the green drive circuit 11 is connected to a green cathode KG through a phase compensating circuit 14. Thus, the green drive signal is delayed, and phases of respective color drive signals in cathodes KR- KB of the color picture tube 13 are made coincident with one another practically. |
