| 摘要 |
PURPOSE:To obtain a well bisymmetrical convergence characteristic in the peripheral part of the screen, by inserting a phase correcting circuit in a luminance signal system to make phases of red, green, and blue drive signals coincident with one another in the signal input teminal of a color picture tube. CONSTITUTION:Color difference signals R-Y, G-Y, and B-Y are inputted to red, green, and blue drive circuits 11-13 respectively, and a luminance signal Y is inputted to these circuits 11-13 also. If the phase of the green drive signal is earlier than that of red and blue drive signals, the luminance signal Y to the green drive circuit 12 is inputted through a phase correcting circuit 14 constituting a delay circuit. Outputs of drive circuits 11-13 are sent to red, green, and blue cathodes KR, KG, and KB of a color picture tube 10 respectively. As the result, the phase of the green drive signal in the cathode KG is delayed to make phases of respective drive signals coincident with one another. |
