Liquid crystal display device with improved convergence efficiency and converting reflector of the same
AssigneePioneer Electronic Corporation
InventorsMasami Nishida, Masataka Izawa, Kunimoto Tsuchiya
Life of this patent
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Abstract
A liquid crystal display device comprises a converging reflector, a liquid crystal panel, a condenser lens and a projection lens, wherein a correlation between these optical parts and structure of sizes of the optical parts is considered. Accordingly, a convergence efficiency of the device as whole system can be improved. A converging reflector comprises a light source and a reflecting mirror reflecting a light from the light source, wherein a curved plane shape of the mirror is offset radially to the same length as a radius of a light emitting tube of the light source. Accordingly, a convergence efficiency of the converging reflector can be improved.
Claims7
A liquid crystal display device comprising:
- a converging reflector provided with a linear light source positioned at a central axis of the converging reflector and a plane of reflection formed by a reflecting mirror of paraboloid of revolution;
- a liquid crystal panel for selectively passing a light reflected from the converging reflector;
- a condenser lens arranged between the converging reflector and the liquid crystal panel for transmitting a ray of the light from the converging reflector to the liquid crystal panel;
- and
- a projection lens for projecting the ray of the light from the liquid crystal panel on an irradiation plane,
- wherein a curvature of the paraboloid of the converging reflector is about 0.015.+-.0.0025 mm.sup.-1, a length of the linear light source is about 5 to 7 mm, an aperture of the converging reflector is about 100.+-.20 mm, and an effective display size of the liquid crystal panel is about 2.8 to 3.3 inches.
Dependencies are inferred from the claim text.