Light guides and backlight systems incorporating light redirectors at varying densities
First Claim
Patent Images
1. A light guide comprising:
- a front surface, a rear surface, and at least one edge separating the front and rear surfaces;
a first light introduction position on one of the at least one edge;
a second light introduction position on at least one edge and spaced away from the first light introduction position;
a plurality of geometric light redirectors formed therein on one of the front surface and the rear surface of the light guide, wherein;
a front face of each geometric light redirector intersects with the one of the front surface and the rear surface along an intersection line;
the plurality of geometric light redirectors are configured to redirect light from at least one of the first and second light introduction positions toward the front surface;
the plurality of geometric light redirectors include a first group of geometric light redirectors, the intersection line of each geometric light redirector of the first group of light redirectors being substantially perpendicular to a line connecting a midpoint of the intersection line with the first light introduction position;
the plurality of geometric light redirectors include a second group of geometric light redirectors, the intersection line of each geometric light redirector of the second group of light redirectors being substantially perpendicular to a line connecting a midpoint of the intersection line with the second light introduction position; and
a first region of the light guide wherein the geometric light redirectors associated with the first group and the geometric light redirectors associated with the second group are intermixed such that a line connecting a midpoint of the intersection line of at least one geometric light redirector of the first group with the first light introduction position intersects a line connecting a midpoint of the intersection line of at least one geometric light redirector of the second group with the second light introduction position.
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Abstract
Light guides and backlight systems are disclosed that include one or more groups of geometric light redirectors whose arrangement and/or orientation across the surface of a light guide varies to improve light emission uniformity and to reduce visual artifacts.
507 Citations
20 Claims
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1. A light guide comprising:
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a front surface, a rear surface, and at least one edge separating the front and rear surfaces; a first light introduction position on one of the at least one edge; a second light introduction position on at least one edge and spaced away from the first light introduction position; a plurality of geometric light redirectors formed therein on one of the front surface and the rear surface of the light guide, wherein; a front face of each geometric light redirector intersects with the one of the front surface and the rear surface along an intersection line; the plurality of geometric light redirectors are configured to redirect light from at least one of the first and second light introduction positions toward the front surface; the plurality of geometric light redirectors include a first group of geometric light redirectors, the intersection line of each geometric light redirector of the first group of light redirectors being substantially perpendicular to a line connecting a midpoint of the intersection line with the first light introduction position; the plurality of geometric light redirectors include a second group of geometric light redirectors, the intersection line of each geometric light redirector of the second group of light redirectors being substantially perpendicular to a line connecting a midpoint of the intersection line with the second light introduction position; and a first region of the light guide wherein the geometric light redirectors associated with the first group and the geometric light redirectors associated with the second group are intermixed such that a line connecting a midpoint of the intersection line of at least one geometric light redirector of the first group with the first light introduction position intersects a line connecting a midpoint of the intersection line of at least one geometric light redirector of the second group with the second light introduction position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for manufacturing a light guide comprising:
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providing the light guide, the light guide including a front surface, a rear surface, and at least one edge separating the front and rear surfaces; forming a first light introduction position on one of the at least one edge; forming a second light introduction position on at least one edge and spaced away from the first light introduction position; and forming a plurality of geometric light redirectors on one of the front surface and the rear surface within the light guide, wherein; a front face of each geometric light redirector intersects with the one of the front surface and the rear surface along an intersection line; the plurality of geometric light redirectors are arranged to redirect light from at least one of the first and second light introduction positions toward the front surface; the plurality of geometric light redirectors include a first group of geometric light redirectors, the intersection line of each geometric light redirector of the first group of light redirectors being substantially perpendicular to a line connecting a midpoint of the intersection line with the first light introduction position; the plurality of geometric light redirectors include a second group of geometric light redirectors, the intersection line of each geometric light redirector of the second group of light redirectors being substantially perpendicular to a line connecting a midpoint of the intersection line with the second light introduction position; and forming a first region within the light guide wherein the geometric light redirectors associated with the first group and the geometric light redirectors associated with the second group are intermixed such that a line connecting a midpoint of the intersection line of at least one geometric light redirector of the first group with the first light introduction position intersects a line connecting a midpoint of the intersection line of at least one geometric light redirector of the second group with the second light introduction position. - View Dependent Claims (19, 20)
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Specification