Projection television device

Details Projection television device Projection television device

1996-02-08

1999-03-02

Lee, Michael

Television

Video display

Projection device

348806, 348778, 313463, 313467, 313 21, H04N 323, H04N 931

Patent

active

058778233

ABSTRACT:
A projection television device includes a projection cathode-ray tube for red (1a), a projection cathode-ray tube for green (1b) and a projection cathode-ray tube for blue (1c) which are provided with phosphor layers (5a, 5b and 5c), respectively, each having a thickness which varies continuously so that it may be thick at the center portion and may be thinner at the peripheral portion. Having the above configuration, the projection television device makes it possible to suppress the loss in resolution and luminance at the peripheral portion of the image projected on the screen, thereby ensuring uniform resolution and luminance of the image. Thus, it becomes possible to enhance the quality of the image produced on the screen.

REFERENCES:
patent: 3507551 (1970-04-01), Stetten
patent: 4142126 (1979-02-01), DuBois
patent: 4274110 (1981-06-01), Lehnert
patent: 4634926 (1987-01-01), Vriens et al.
patent: 4914510 (1990-04-01), Brennesholtz et al.
patent: 5065071 (1991-11-01), Donofrio et al.
patent: 5337093 (1994-08-01), Kaneko et al.
patent: 5559564 (1996-09-01), Nomura

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