COLOR CRT DEVICE

PURPOSE:To reliably perform address detection by selecting the spacific red phosphor to the Eu density indicating a specific (x) value in the x-y chromaticity diagram of emission and arranging a filter cutting the light with a specific wavelength at the light receiving section. CONSTITUTION:The red phosphor of a color fluorescent screen is made of Y2O2S:Eu, and the Eu is selected to the density indicating an (x) value of 0.618- 0.641 in the x-y chromaticity diagram of emission of this red phosphor. The emission of the bright line spectrum of 6,265Angstrom having the persistence characteristic shown by Curve 1 is mainly used for visible images, and the emission of the bright line spectrum of D1 F1 having the short-persistence characteristic shown by Curve 2 is mainly used for the address detection via write-pen pickup by utilizing the difference in persistence characteristic. Accordingly, a filter cutting the emission of the bright line spectrum having the long-persistence characteristic, i.e., cutting the long wavelength of 5,800Angstrom or more, is arranged at the light receiving section via write-pen pickup receiving the address detection light.