Television – Video display – Projection device
Patent
1994-07-07
1996-09-24
Metjahic, Safet
Television
Video display
Projection device
348786, 348778, 313469, H04N 572, H04N 931
Patent
active
055595642
ABSTRACT:
A cathode ray tube apparatus for a projection TV system which improves the color purity of the luminescence in the cathode ray tube, reduces the chromatic aberration by the projection lens, enables the same type of projection lens to be mounted for all of the green, red and blue CRT apparatuses, and enables manufacturing costs to be slashed by such a common use of components. A light-absorbing agent is incorporated into the panel glass so that the transmittance having the light of wavelengths other than the main wavelength of the spectrum of luminescence of the phosphor of the CRT apparatus, is reduced below the transmittance of the light of the main wavelength. By incorporating this agent into the panel glass of a green CRT apparatus the average value of the transmittance of the light of the wavelength in the range of 500 nm to 560 nm becomes higher than the transmittance of the light of the wavelengths outside this range. Alternatively, by incorporating the agent into the panel glass of a red CRT apparatus the average value of the transmittance of the light of the wavelength in the range of 600 nm to 700 nm is increased as compared with the transmittance of the light of the wavelength in the range of 500 nm to 600 nm.
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Patent Abstract of 03-61903, Projector for Projection Television, Mar. 18, 1991.
Kananen Ronald P.
Metjahic Safet
Sony Corporation
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