Patent ID: 6900830

Claim:
A CRT display device comprising: an on-screen display circuit for producing a display signal that is displayed on-screen on a CRT and supersposing said produced display signal on a video signal; a brightness restraining circuit for suppressing the brightness of CRT in a range below an upper limit value on the basis of an anode current of CRT; and a controller for controlling the operation of said on-screen display circuit and the operation of said brightness restraining circuit, and controlling a power supply to be turned on or off; wherein when a display signal having at least a 50 percent area ratio of higher brightness portion is a discharging display signal, said controller controls said on-screen display circuit to produce the discharging display signal, upon an instruction for turning off the power supply being given, and controls the power supply to be turned off in a state where the operation of said brightness restraining circuit to suppress the brightness is relieved or stopped.