CRT display device

A CRT display device, comprising:

• an electron gun having a cathode and first, second electrodes respectively including electron passing holes for drawing electrons from said cathode;
• and
• driving voltage generating means for generating a driving voltage for drawing electrons from said cathode,
• wherein a cathode voltage during cutoff ranges from 50 V to 80 V regarding a voltage of said first electrode as zero,
• following conditions among a diameter of said electron passing hole of said first electrode, a thickness of said first electrode at said electron passing hole, a diameter of said electron passing hole of said second electrode, a thickness of said second electrode at said electron passing hole and a distance between said first, second electrodes are satisfied:
• thickness of first electrode at electron passing hole/diameter of electron passing hole of first electrode≦0.23;
• distance between first, second electrodes/diameter of electron passing hole of second electrode≦0.53;
• and
• thickness of second electrode at electron passing hole/diameter of electron passing hole of second electrode≦0.87, and
• said driving voltage in an area having a gradation level lower than a predetermined gradation level is kept low in order to keep brightness in said area of said gradation level lower than said predetermined gradation level lower than real brightness of a first video signal to be inputted to said CRT display device.