Side emitting device, backlight unit using the same as light source and liquid crystal display employing the backlight unit
First Claim
1. A side emitting device comprising:
- a light-emitting device to emit light; and
a side emitter to change a path of at least a part of the light incident from the light-emitting device,wherein when a main direction of the light emitted from the emitting device is an upward direction, a direction opposite to the upward direction is a downward direction, and an axis perpendicular to the main direction is a horizontal axis, the side emitter comprising;
a first reflecting surface to reflect the light emitted from the light-emitting device in a first range of angles close to a central axis thereof;
a first refracting surface to refract the light reflected by the first reflecting surface obliquely downward with respect to the horizontal axis; and
a second refracting surface to refract the light emitted from the light-emitting device in a second range of angles complementary to the first range of angles.
1 Assignment
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Accused Products
Abstract
A side emitting device, a backlight unit using the same as a light source, and a liquid crystal display (LCD) employing the backlight unit. The side emitting device includes a light-emitting device to emit light, and a side emitter to change the path of at least part of the light emitted from the light-emitting device. The side emitter includes a first reflecting surface reflecting light emitted from the light-emitting device in a first range of angles close to a central axis, a first refracting surface refracting the light reflected by the first reflecting surface obliquely downward from the horizontal axis, and a second refracting surface refracting light emitted from the light-emitting device in a second range of angles complementary to the first range of angles. The backlight unit includes at least an array of side emitting devices, a reflection diffusion plate and a first transmission diffusion plate.
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Citations
52 Claims
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1. A side emitting device comprising:
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a light-emitting device to emit light; and a side emitter to change a path of at least a part of the light incident from the light-emitting device, wherein when a main direction of the light emitted from the emitting device is an upward direction, a direction opposite to the upward direction is a downward direction, and an axis perpendicular to the main direction is a horizontal axis, the side emitter comprising; a first reflecting surface to reflect the light emitted from the light-emitting device in a first range of angles close to a central axis thereof; a first refracting surface to refract the light reflected by the first reflecting surface obliquely downward with respect to the horizontal axis; and a second refracting surface to refract the light emitted from the light-emitting device in a second range of angles complementary to the first range of angles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 48, 49)
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12. A backlight unit comprising:
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an array of the side emitting devices arranged on a base plate, each side emitting device comprising; a light-emitting device to emit light; and a side emitter to change a path of at least a part of the light incident from the light-emitting device, wherein when a main direction of the light emitted from the emitting device is an upward direction, a direction opposite to the upward direction is a downward direction, and an axis perpendicular to the main direction is a horizontal axis, and the side emitter includes; a first reflecting surface to reflect the light emitted from the light-emitting device in a first range of angles close to a central axis; a first refracting surface to refract the light reflected by the first reflecting surface obliquely downward with respect to the horizontal axis, and a second refracting surface to refract the light emitted from the light-emitting device in a second range of angles outside of the first range of angles;
a reflection diffusion plate disposed under the side emitting devices, to diffuse and reflect the light incident from the side emitting device; anda first transmission diffusion plate disposed above the side emitting devices, to diffuse and transmit the incident light. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 50, 51, 52)
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27. A liquid crystal display comprising:
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a liquid crystal panel; and the backlight unit to emit light to the liquid crystal panel, the backlight unit comprising; an array of the side emitting devices arranged on a base plate, and each side emitting device includes; a light-emitting device to emit light, and a side emitter to change a path of at least a part of the light incident from the light-emitting device, wherein when a main direction of the light emitted from the emitting device is an upward direction, a direction opposite to the upward direction is a downward direction, and an axis perpendicular to the main direction is a horizontal axis, and the side emitter includes a first reflecting surface to reflect the light emitted from the light-emitting device in a first range of angles close to a central axis, a first refracting surface to refract the light reflected by the first reflecting surface obliquely downward with respect to the horizontal axis, and a second refracting surface to refract the light emitted from the light-emitting device in a second range of angles outside of the first range of angles, a reflection diffusion plate disposed under the side emitting devices, to diffuse and reflect the light incident from the side emitting device, and a first transmission diffusion plate disposed over the side emitting device, to diffuse and transmit incident light. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. An illumination controlling apparatus comprising:
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a base portion that contacts a light-emitting device to receive the emitted light therefrom; a first cone-shaped reflecting surface to reflect the light received within a first range of angles with respect to a central axis thereof; a first refracting surface to refract the light reflected by the first reflecting surface obliquely and back toward the light emitting device; and a second refracting surface to refract the light received within a second range of angles complementary to the first range of angles with respect to a central axis thereof. - View Dependent Claims (43, 44, 45)
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46. A method of redirecting light emitted by a Lambertian light source mounted on a base surface, wherein when a central axis is perpendicular to the base surface passing through the Lambertian light source, and an axis perpendicular to the central axis passing through the Lambertian light source is a horizontal axis, the method comprising:
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changing a path of at least a part of the light from the Lambertian light source emitted in a first range of angles close to the central axis; refracting the light with changed path obliquely with respect to the horizontal axis towards the Lambertian light source; and refracting a first portion of the light from the Lambertian light source emitted in a second range of angles complementary to the first range of angles obliquely with respect to the horizontal axis towards the Lambertian light source. - View Dependent Claims (47)
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Specification