| 摘要 |
PROBLEM TO BE SOLVED: To reduce screen distortion which is caused by luminance change by providing a means which outputs a distortion correction control signal based on luminance change to a display screen. SOLUTION: In an anode voltage supply circuit 8, a beam current detection circuit 14 detects beam current that changes, accompanying luminance change on an image on a display. Also, a time constant circuit 15 of the circuit 8 receives an input of voltage VABL that is formed, accompanying the change of beam current which is detected the circuit 14, forms an anode voltage correction signal VEHC which is supplied to a power supply voltage control circuit 16 and a horizontal size control circuit 55 and outputs it. The correction of image distortion that corresponds to luminance change on a display screen is controlled by supplying the signal VEHC that is outputted from the circuit 15 to the circuits 16 and 55. |
