POLARIZED LIGHT SOURCE SYSTEM AND LIQUID CRYSTAL DISPLAY USING THE SAME
First Claim
1. A polarized light source system comprising:
- a light guide plate made of transparent material, and including a light incident surface, a light emitting surface and a bottom surface;
a light source positioned adjacent to the incident surface;
a lamp cover coating with a reflective film on an inner surface thereof adjacent to the light source;
a pair of prism plates with a plurality of micro-prisms substantially meshing with each other, apex angles of the micro-prisms being in the range from 125°
to 145°
; and
a quarter wave plate coated with a reflective film opposite to the bottom surface of the light guide plate.
1 Assignment
0 Petitions
Accused Products
Abstract
A polarized light source system (20) includes a light guide plate (22), a light source (24), a lamp cover (25), a quarter wave plate (23), an upward prism plate (26) and a downward prism plate (28). The light guide plate defines an optical inputting surface and an optical outputting surface interconnecting therewith. The light source and the lamp cover are stationed next to the optical inputting surface. The upward prism plate stationed next to the optical outputting surface defines a plurality of upward micro-prisms (262) on a surface opposite thereto. The downward prism plate stationed next to the upward prism plate includes a brightness enhancing film (284), and a plurality of downward micro-prisms (282) on a surface facing the upward prism plate. The upward and downward micro-prisms engaged with each other. The quarter wave plate includes a reflective film on a backing surface.
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Citations
13 Claims
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1. A polarized light source system comprising:
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a light guide plate made of transparent material, and including a light incident surface, a light emitting surface and a bottom surface;
a light source positioned adjacent to the incident surface;
a lamp cover coating with a reflective film on an inner surface thereof adjacent to the light source;
a pair of prism plates with a plurality of micro-prisms substantially meshing with each other, apex angles of the micro-prisms being in the range from 125°
to 145°
; and
a quarter wave plate coated with a reflective film opposite to the bottom surface of the light guide plate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A liquid crystal display comprising:
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a liquid crystal panel including a thin film transistor substrate, a color filter substrate, liquid molecules filled therebetween, and two polarizers respectively adjacent to the thin film transistor substrate and the color filter substrate, the polarizers having optical axes perpendicular to each other; and
a polarized light source system, including a light guide plate made of transparent material and which includes a light incident surface, a light emitting surface and a bottom surface, a light source positioned adjacent to the incident surface, a lamp cover coated with reflective film on an inner surface thereof adjacent to the light source, a pair of prism plates having a plurality of micro-prisms substantially meshing with each other, the micro-prisms having apex angles in the range from 125°
to 145°
, and a quarter wave plate coated with a reflective film opposite to the bottom surface of the light guide plate. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of making a liquid crystal display, comprising steps of:
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providing a light guide plate made of transparent material, said light guide plate defining a light incident surface, a light emitting surface and a bottom surface opposite to said light emitting surface;
positioning an non-polarized light source beside the light incident surface;
positioning a pair of prism plates with at least one of said pair being attached to the light emitting surface; and
positioning a quarter wave plate on the bottom surface with a reflective film opposite thereto;
whereinlight enters said pair of prism plates at a Brewster'"'"'s angle so as to achieve a combined refractive light being a nearly pure p-polarized one and a reflected light being an entirely s-polarized one, and wherein the reflected light further is converted to be p-polarized one by said quarter wave plate and further reenters the pair of prism plates to join said combined refractive light.
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Specification