Planar light source device and display device using the same
First Claim
Patent Images
1. A planar light source device comprising:
- a housing having an opening portion in an upper surface thereof;
a plurality of light source units, each including a light guiding rod arranged in the housing and at least one point light source disposed so as to oppose at least one end face of the light guiding rod and emit light to the one end face; and
a reflection plate disposed below the plurality of light source units in the housing and reflects light emitted from the light source units to the opening portion,wherein each of the light guiding rods has a light emission means for varying a light emission rate in accordance with a distance from the point light source to one end face thereof, the light emission means being an uneven surface whose roughness is varied in accordance with the distance.
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Accused Products
Abstract
In a planar light guiding device and a display device, plural light guiding rods are arranged in parallel to one another in a housing having an opening portion serving as a light emission face at the upper surface thereof, and a point light source (LED) 2 is disposed so as to oppose to at least one of both the end faces 1a of each light guiding rod through a space, thereby constituting a light source unit. These light source units are arranged in the metal housing to thereby form the planar light guiding device.
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Citations
15 Claims
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1. A planar light source device comprising:
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a housing having an opening portion in an upper surface thereof; a plurality of light source units, each including a light guiding rod arranged in the housing and at least one point light source disposed so as to oppose at least one end face of the light guiding rod and emit light to the one end face; and a reflection plate disposed below the plurality of light source units in the housing and reflects light emitted from the light source units to the opening portion, wherein each of the light guiding rods has a light emission means for varying a light emission rate in accordance with a distance from the point light source to one end face thereof, the light emission means being an uneven surface whose roughness is varied in accordance with the distance. - View Dependent Claims (2, 3, 4, 5)
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6. A planar light source device comprising:
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a housing having an opening portion in an upper surface thereof; a plurality of light source units, each including a light guiding rod arranged in the housing and at least one point light source disposed so as to oppose to at least one end face of the light guiding rod and emit light to the one end face; and a reflection plate which is disposed below the plurality of light source units in the housing and reflects light emitted from the light source units to the opening portion, wherein each of the light guiding rods is designed so that the sectional area thereof in the vertical direction to the longitudinal direction thereof is varied. - View Dependent Claims (7, 8, 9, 10)
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11. A planar light source device comprising:
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a housing having an opening portion in an upper surface thereof; a plurality of light source units, each including a light guiding rod arranged in the housing and at least one point light source disposed so as to oppose at least one end face of the light guiding rod and emit light to the one end face; and a reflection plate which is disposed below the plurality of light source units in the housing and reflects light emitted from the light source units to the opening portion, wherein each of the light guiding rods has a light emission means for varying a light emission rate in accordance with a distance from the point light source to the end face thereof, the light emission means is a prism array whose brightness distribution in a longitudinal direction of the light guiding rod is adjusted in accordance with the distance. - View Dependent Claims (12, 13, 14, 15)
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Specification