Light guide plate having high utilization of light energy and backlight module adopting the same
First Claim
1. A light guide plate comprising:
- an incident surface;
an emission surface intersecting with the incident surface and substantially perpendicular to the incident surface; and
a bottom surface intersecting with the incident surface and opposite to the emission surface;
wherein the light guide plate is birefringent and has internal stresses/strains therein, an angle between a direction of a main one of the stresses/strains and the incident surface is bigger than 0 degree and smaller than 90 degrees.
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Accused Products
Abstract
A light guide plate includes an incident surface, an emission surface, and a bottom surface. The emission surface intersects with the incident surface and is substantially perpendicular to the incident surface. The bottom surface intersects with the incident surface and is opposite to the emission surface. The light guide plate is birefringent and has internal stresses/strains therein, causing the light guide plate to exhibit a light-polarizing phase delay. An angle between a direction of one of the main stresses/strains and the light incident surface is bigger than 0 degree and smaller than 90 degrees. A plurality of sub-wavelength gratings can be further formed on the emission surface of the light guide plate. A backlight module, adopting the above-mentioned light guide plate, further includes a corresponding light source positioned beside the incident surface of the light guide plate.
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Citations
16 Claims
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1. A light guide plate comprising:
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an incident surface;
an emission surface intersecting with the incident surface and substantially perpendicular to the incident surface; and
a bottom surface intersecting with the incident surface and opposite to the emission surface;
wherein the light guide plate is birefringent and has internal stresses/strains therein, an angle between a direction of a main one of the stresses/strains and the incident surface is bigger than 0 degree and smaller than 90 degrees. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A backlight module comprising:
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a light guide plate comprising;
an incident surface;
an emission surface intersecting with the incident surface and substantially perpendicular to the incident surface; and
a bottom surface intersecting with the incident surface and opposite to the emission surface;
at least one light source located beside the incident surface of the light guide plate;
a reflective plate positioned below the light guide plate; and
a polarizing beam splitter positioned upon the light guide plate;
wherein the light guide plate is birefringent and has internal stresses/strains therein, an angle between a direction of a main one of the main stresses/strains and the incident surface is bigger than 0 degree and smaller than 90 degrees. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification