Color cathode ray tube

Details Color cathode ray tube Color cathode ray tube

2006-12-12

2006-12-12

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Envelope

C313S479000, C220S00210A

Reexamination Certificate

active

07148615

ABSTRACT:
The present invention enhances the quality of displayed images by enhancing the uniformity of the total transmissivity over the whole surface of a panel having a wavelength selective absorption layer imparted with gradation thus reducing the color difference of the body color. A transmissivity ratio between a peripheral portion and a central portion of a panel formed of tinted glass which differs in wall thickness between the peripheral portion and the central portion of a screen before the surface treatment is set to a value not greater than 60%, and the body color of the panel is set such thatL*=30 to 40, a*=−8.5 to 1.5, b*=−5 to 5 at the center portion,L*=13.5 to 23.5, a*=−7.5 to 2.5, b*=−6.5 to 3.5 at the peripheral portion,where color difference is set to Δa*b*≦3, andthe film formed on the outer surface of the panel is constituted of a wavelength selective absorption layer and a conductive layer which is formed over the wavelength selective absorption layer.

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