Surface light source device and adjusting method of chromaticity thereof
First Claim
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1. A surface light source device comprisinga light guide plate including a light incident surface and a light emitting surface, a light source part including a plurality of point light sources arranged on a light incident surface side of the light guide plate, wherein two of the point light sources of the light source part having chromaticity out of a center of an aimed chromaticity range in opposite hue directions are arranged adjacently.
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Accused Products
Abstract
In this surface light source device, light is incident from a plurality of point light sources 2 arranged on a one side end surface of a light guide plate 1, is reflected on a light reflecting surface 11 on a rear surface of the light guide plate 1, and is emitted from a front surface of the light guide plate 1. The point light sources 2 comprise white light emitting diode elements. Two white light emitting diode elements out of six of the white light emitting diode elements having chromaticity outermost from a center of an aimed chromaticity range in opposite hue directions are arranged in an approximately center of a group of the white diode elements.
117 Citations
12 Claims
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1. A surface light source device comprising
a light guide plate including a light incident surface and a light emitting surface, a light source part including a plurality of point light sources arranged on a light incident surface side of the light guide plate, wherein two of the point light sources of the light source part having chromaticity out of a center of an aimed chromaticity range in opposite hue directions are arranged adjacently.
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6. A surface light source device comprising
a light guide plate including a light incident surface and a light emitting surface, a light source part including a plurality of point light sources arranged on a light incident surface side of the light guide plate, wherein two of the point light sources of the light source part having chromaticity out of a center of an aimed chromaticity range in opposite hue directions are arranged adjacently, and wherein the light source part is provided with not less than four point light sources, and two to the point light sources having chromaticity out of the center of the aimed chromaticity range in the opposity hue directions are arranged in an approximately center of a group of the plurality of the point light sources.
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7. A surface light source device comprising
a light guide plate including a light incident surface and a light emitting surface, a light source part including a plurality of point light sources arranged of a light incident surface side of the light guide plate, two of the point light sources of the light source part having chromaticity out of a center of an aimed chromaticity range in opposite hue directions are arranged adjacently, and wherein the two of the point light sources have the chromaticity outermost from the center of the aimed chromaticity range in the opposite hue direction.
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9. An adjusting method of a surface light source device which light is incident from a plurality of point light sources arranged on a side of a light incident surface provided on a one side end surface of a light guide plate and is emitted from a light emitting surface on a front surface of the light guide plate, comprising
a process for arranging the plurality of the point light sources having chromaticity out of a center of an aimed chromaticity range in opposite hue directions adjacently, a process for providing measurement of light which is emitted from the point light source and further is emitted from the light guide plate and judging whether the light is in the aimed chromaticity range, and a process for arranging chromaticity correcting means corresponding to the emitted light in connection with an optical propagating path of the light guide plate when it is found from the measurement that the emitted light is not in the aimed chromaticity range.
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10. An adjusting method of a surface light source device which light is incident from a light source arranged on a side of a light incident surface provided on a one side end surface of a light guide plate, is reflected on a reflecting member arranged in proximity to a rear surface opposite to a front surface of the light guide plate, and is emitted as a plane-shaped light from the front surface of the light guide plate, comprising
a process for providing measurement of chromaticity difference from an aimed chromaticity range of light which is emitted from the light source and further emitted from the light guide plate, and a process for selecting a colored reflecting member for correcting the emitted light to be in the aimed chromaticity range as a reflecting member arranged in proximity of the rear surface of the light guide plate.
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11. An adjusting method of a surface light source device which light is incident from a plurality of point light sources arranged on a side of a light incident surface provided on a one side end surface of a light guide plate and is emitted from a light emitting surface on a front surface of the light guide plate, comprising
a process for arranging the plurality of the point light sources having chromaticity out of a center of an aimed chromaticity range in opposite hue directions adjacently, a process for providing measurement of light which is emitted from the point light source and further is emitted from the light guide plate and judging whether the light is in the aimed chromaticity range, and a process for arranging chromaticity correcting means corresponding to the emitted light in connection with an optical propagating path of the light guide plate when it is found from the measurement that the emitted light is not in the aimed chromaticity range, and wherein the point light sources and the light source comprises a group of the point light sources including not less than four white light emitting diode elements, and two of the white light emitting diode elements having chromaticity outermost from a center of the aimed chromaticity range in opposite hue directions are arranged in an approximately center of the group of the point light sources.
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12. An adjusting method of a surface light source device which light is incident from a plurality of point light sources arranged on a side of a light incident surface provided on a one side end surface of a light guide plate and is emitted from a light emitting surface on a front surface of the light guide plate, comprising
a process for arranging the plurality of the point light sources having chromaticity out of a center of an aimed chromaticity range in opposite hue directions adjacently, a process for providing measurement of light which is emitted from the point light source and further is emitted from the light guide plate and judging whether the light is in the aimed chromaticity range, and a process for arranging chromaticity correcting means corresponding to the emitted light in connection with an optical propagating path of the light guide plate when it is found from the measurement that the emitted light is not in the aimed chromaticity range, and wherein the chromaticity correcting means is a colored reflecting member provided on a rear surface opposite to the front surface of the light guide plate for emitting light.
Specification
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Current AssigneeCallahan Cellular LLC (Intellectual Ventures LLC)
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Original AssigneeSanyo Electric Company Limited (Panasonic Holdings Corporation)
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InventorsNishida, Nobuhito, Ochiiwa, Masashi, Kuwabara, Satoshi, Yamamura, Toru, Satou, Michiaki, Yamashita, Hiroshi
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Primary Examiner(s)O'Shea, Sandra
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Assistant Examiner(s)Sawhney, Hargobind S.
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Application NumberUS09/717,144Time in Patent Office790 DaysField of Search362/31, 362/800, 362/545, 362/231, 362/230, 362/330, 362/551, 257/594, 313/512, 345/82, 345/83, 345/102, 345/46US Class Current362/612CPC Class CodesF21Y 2105/00 Planar light sourcesF21Y 2115/10 Light-emitting diodes [LED]G02B 6/0048 with stepwise taperG02B 6/0068 Arrangements of plural sour...Y10S 362/812 Signs
