Flat screen monochrome cathode-ray tube, with a diagonal measurement of the screen of 142 mm or more but not exceeding 190 mm, a luminescence of 300 lumen or more but not exceeding 2 000 lumen, a resolution of 0,06 mm or more but not exceeding 0,1 mm, phosphor types P1 or P22 or P53 or P55 or P56, an anode voltage of more than 34 kV, a focus voltage of more than 7 kV and a cathode current of 3 mA or more.
