Prism sheet and backlight unit employing the same
First Claim
1. A prism sheet comprising:
- a substrate which has a first incident surface, transmits light incident from the first incident surface and has at least one groove disposed inwardly in a surface of the substrate opposed to the first incident surface;
a refractive member provided in the groove and having a higher refractive index than a refractive index of the substrate; and
a prism arranged to face the refractive member, refract and transmit incident light, and having a lower refractive index than the refractive index of the refractive member,wherein the prism comprises,a second incident surface which faces the refractive member; and
a first exit surface and a second exit surface which are arranged to face each other at an angle; and
,wherein a light incident angle to the first exit surface or the second exit surface is smaller than a critical angle for total reflection regardless of an incident angle to the first incident surface.
2 Assignments
0 Petitions
Accused Products
Abstract
Provided is a prism sheet including a substrate transmitting incident light and having at least one groove inwardly formed in a surface of the substrate. A refractive member is provided in the groove and has a relatively higher refractive index than a refractive index of the substrate. A prism is arranged to face the refractive member, refract and transmit incident light, and has a relatively lower refractive index than the refractive index of the refractive member. A backlight unit is provided that includes at least one light source emitting light, along with a light guide panel that guides a procession of light emitted from the light source. The prism sheet includes at least one groove inwardly formed in a surface of the light guide panel. A refractive member is provided in the groove and a prism is arranged to face the refractive member.
26 Citations
26 Claims
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1. A prism sheet comprising:
- a substrate which has a first incident surface, transmits light incident from the first incident surface and has at least one groove disposed inwardly in a surface of the substrate opposed to the first incident surface;
a refractive member provided in the groove and having a higher refractive index than a refractive index of the substrate; and a prism arranged to face the refractive member, refract and transmit incident light, and having a lower refractive index than the refractive index of the refractive member, wherein the prism comprises, a second incident surface which faces the refractive member; and a first exit surface and a second exit surface which are arranged to face each other at an angle; and
,wherein a light incident angle to the first exit surface or the second exit surface is smaller than a critical angle for total reflection regardless of an incident angle to the first incident surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a substrate which has a first incident surface, transmits light incident from the first incident surface and has at least one groove disposed inwardly in a surface of the substrate opposed to the first incident surface;
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11. A prism sheet comprising:
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a substrate which has a first incident surface, transmits light incident from the first incident surface and has a plurality of grooves disposed inwardly in a surface of the substrate in an inverted triangular shape, and formed of acryl-based resin; a refractive member provided in each of the grooves, the refractive member including at least one of a cyclic olefin copolymer, polycarbonate, and polyetherimide having a higher refractive index than a refractive index of the substrate; and a prism arranged to face the refractive member, refract and transmit incident light, and formed of acryl-based resin having a lower refractive index than the refractive index of the refractive member, wherein the prism comprises, a second incident surface which faces the refractive member; and a first exit surface and a second exit surface which are arranged to face each other at an angle; and
,wherein a light incident angle to the first exit surface or the second exit surface is smaller than a critical angle for total reflection regardless of an incident angle to the first incident surface.
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12. A backlight unit comprising:
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at least one light source emitting light; a light guide panel guiding a procession of light emitted from the light source and incident on a side surface of the light guide panel, the light guide panel having a light exit surface through which the light exits; a reflective panel separated a predetermined distance from a surface opposite to the light exit surface of the light guide panel, the reflective panel reflects incident light toward the light exit surface; and a prism sheet which comprises, a substrate which has a first incident surface, transmits light incident from the first incident surface and has at least one groove disposed inwardly in a surface of the light guide panel opposed to the first incident surface; a refractive member provided in the at least one groove and having a higher refractive index than a refractive index of the light guide panel; and a prism arranged to face the refractive member, refract and transmit incident light, and having a relatively lower refractive index than the refractive index of the refractive member, wherein the prism comprises, a second incident surface which faces the refractive member; and a first exit surface and a second exit surface which are arranged to face each other at an angle; and
,wherein a light incident angle to the first exit surface or the second exit surface is smaller than a critical angle for total reflection regardless of an incident angle to the first incident surface. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A backlight unit comprising:
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at least one light source emitting light; a light guide panel which guides a procession of light emitted from the light source and incident on a side surface of the light guide panel, the light guide panel having a light exit surface through which the light exits; a reflective panel separated a predetermined distance from a surface opposite to the light exit surface of the light guide panel, the reflective panel reflects incident light toward the light exit surface; and a prism sheet disposed between the light guide panel and the reflective panel, which comprises, a substrate which has a first incident surface, transmits light incident from the first incident surface and has at least one groove inwardly formed in a surface of the substrate opposed to the first incident surface; a refractive member provided in the groove and having a higher refractive index than a refractive index of the substrate; and a prism arranged to face the refractive member, refract and transmit incident light, and having a lower refractive index than the refractive index of the refractive member, wherein the prism comprises, a second incident surface which faces the refractive member; and a first exit surface and a second exit surface which are arranged to face each other at an angle; and
,wherein a light incident angle to the first exit surface or the second exit surface is smaller than a critical angle for total reflection regardless of an incident angle to the first incident surface. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A backlight unit comprising:
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at least one light source emitting light; a light guide panel which guides a procession of light emitted from the light source and incident on a side surface of the light guide panel, the light guide panel having a light exit surface through which the light exits; a reflective panel separated a predetermined distance from a surface opposite to the light exit surface of the light guide panel, the reflective panel reflects incident light toward the light exit surface; a prism sheet which comprises, a substrate which has a first incident surface, transmits light incident from the first incident surface and has a plurality of grooves disposed inwardly in a surface of the light guide panel opposed to the first incident surface; a plurality of refractive members respectively provided in the grooves, having a higher refractive index than a refractive index of the light guide panel, and arranged such that the refractive index increases from a portion close to the light source to a portion located far from the light source; and a plurality of prisms arranged to face the refractive members, refract and transmit incident light, and has a relatively lower refractive index than the refractive index of the refractive member, the plurality of prisms comprising, a second incident surface which faces the plurality of refractive members; incident surfaces which face the refractive members; and first exit surfaces and second exit surfaces which are arranged to face each other at an angle; and a light incident angle to the first exit surfaces or the second exit surfaces is smaller than a critical angle for total reflection regardless of an incident angle to the first incident surface; a diffusive member formed of a plurality of beads distributed in the light guide panel which diffuses and transmits incident light; and a second prism sheet arranged between the light guide panel and the reflective panel and comprising a plurality of prisms which refracts and transmits incident light in a direction.
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Specification