Projection type display apparatus

Details Projection type display apparatus Projection type display apparatus

2007-12-25

2007-12-25

Lee, Michael H. (Department: 2622)

Television

Video display

Projection device

C348S778000, C348S744000, C348S655000

Reexamination Certificate

active

10914131

ABSTRACT:
In a projection type display apparatus including a blue CRT display apparatus with low luminous efficiency and low luminous efficiency, the present invention seeks to improve contrast while suppressing the fall in brightness for red, green, and blue color as a whole. In the projection type display apparatus, the images of three colors outputted from three monochrome CRT display apparatuses10R,10G,10B which respectively output monochromatic video signals of red, green, and blue color, are respectively projected on a screen unit14via a reflecting mirror12so as to synthesize a image of three colors and generate a color image. The brightness of the green CRT display apparatus which outputs the green image having the highest luminous efficiency is increased, while maintaining the brightness of the blue CRT display apparatus10B. Further, a light absorption means for tinting to reduce the increased green brightness is provided to balance the whole brightness of red, green, and blue. Contrast is improved by the light absorption means for tinting. Preferably, the red CRT display apparatus10R is treated similarly to the green CRT display apparatus10G.

REFERENCES:
patent: 5055922 (1991-10-01), Wessling
patent: 5181103 (1993-01-01), Aoyama
patent: 5559564 (1996-09-01), Nomura
patent: 5644360 (1997-07-01), Gurley et al.

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