| 摘要 |
PROBLEM TO BE SOLVED: To average out the video balance of screen longitudinal and lateral directions. SOLUTION: In the CRT display system of a raster scanning system, a deflection changeover control circuit 4 and a deflection changeover circuit 5 for switching an electron beam deflection direction by 90 deg. are provided. Furthermore, a video signal input/output control circuit 1, provided with two frame memories 20 for storing the video information of one frame for calling the information of the horizontal direction of one frame from up to down for one of them and calling the information of the vertical direction of one frame from left to right for the other one, is provided, and the electron beam deflection direction is switched by each vertical cycle. |
