PLANAR LIGHT SOURCE, DISPLAY DEVICE AND METHOD FOR MANUFACTURING THE SAME
First Claim
1. A planar light source comprising a plurality of light-emitting elements, wherein:
- each of the plurality of light-emitting elements is comprised of a combination of a semiconductor light-emitting element for emitting primary light and fluorescent substances for absorbing the primary light and emitting secondary light having a longer wavelength than the primary light, each of the plurality of light-emitting elements emitting combination light of the primary light and the secondary light,said each of the plurality of light-emitting elements, provided in at least a partial area of the planar light source, belongs to a first chromaticity group or a second chromaticity group on a basis of chromaticity of the combination light,(i) a difference between chromaticity of light-emitting elements belonging to the first chromaticity group and a target chromaticity and (ii) a difference between chromaticity of light-emitting elements belonging to the second chromaticity group and the target chromaticity are substantially equal and are away from the target chromaticity in directions reverse to each other, respectively, andthe light-emitting elements belonging to the first chromaticity group and the light-emitting elements belonging to the second chromaticity group are alternately provided, in said at least a partial area, in a longitudinal direction and a transverse direction, respectively.
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Accused Products
Abstract
Light-emitting elements are divided into chromaticity groups on the basis of their chromaticity. In a planar light source, light-emitting elements selected from two of the chromaticity groups are alternately provided in a longitudinal direction and in a transverse direction, respectively. The two chromaticity groups are substantially equally away from a target chromaticity in directions reverse to each other. Further, pairs of two of the light-emitting elements belonging to the two chromaticity groups which are separated from each other, are provided so that distances d2 at which two of the light-emitting elements in each of the pairs are provided are less than distances d1 at which the pairs are provided.
31 Citations
21 Claims
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1. A planar light source comprising a plurality of light-emitting elements, wherein:
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each of the plurality of light-emitting elements is comprised of a combination of a semiconductor light-emitting element for emitting primary light and fluorescent substances for absorbing the primary light and emitting secondary light having a longer wavelength than the primary light, each of the plurality of light-emitting elements emitting combination light of the primary light and the secondary light, said each of the plurality of light-emitting elements, provided in at least a partial area of the planar light source, belongs to a first chromaticity group or a second chromaticity group on a basis of chromaticity of the combination light, (i) a difference between chromaticity of light-emitting elements belonging to the first chromaticity group and a target chromaticity and (ii) a difference between chromaticity of light-emitting elements belonging to the second chromaticity group and the target chromaticity are substantially equal and are away from the target chromaticity in directions reverse to each other, respectively, and the light-emitting elements belonging to the first chromaticity group and the light-emitting elements belonging to the second chromaticity group are alternately provided, in said at least a partial area, in a longitudinal direction and a transverse direction, respectively. - View Dependent Claims (2, 7, 8, 9, 10, 12, 14, 16, 18)
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3. A planar light source comprising a plurality of light-emitting elements, wherein:
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each of the plurality of light-emitting elements is comprised of a combination of a semiconductor light-emitting element for emitting primary light and fluorescent substances for absorbing the primary light and emitting secondary light having a longer wavelength than the primary light, each of the plurality of light-emitting elements emitting combination light of the primary light and the secondary light, said each of the plurality of light-emitting elements, provided in at least a partial area of the planar light source, belongs to a first chromaticity group or a second chromaticity group on a basis of chromaticity of the combination light, (i) a difference between chromaticity of light-emitting elements belonging to the first chromaticity group and a target chromaticity and (ii) a difference between chromaticity of light-emitting elements belonging to the second chromaticity group and the target chromaticity are substantially equal and are away from the target chromaticity in directions reverse to each other, respectively, and pairs of two of the light-emitting elements belonging to the first and second chromaticity groups, respectively are provided, in said at least a partial area, so that intervals at which two of the light-emitting elements in each of the pairs are provided are less than 0.5 times as long as intervals at which the pairs are provided. - View Dependent Claims (4, 5, 6, 11, 13, 15, 17, 19)
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20. A method for manufacturing a planar light source, comprising the steps of:
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preparing a plurality of light-emitting elements, measuring light emitted from the light-emitting elements via red, green and blue filters, dividing the light-emitting elements into red, green and blue luminescence intensity groups, for each luminescence intensity group, based on differences between their luminescence intensity and target luminescence intensity, respectively, and alternately providing light-emitting elements selected from two of the plurality of luminescence intensity groups in a longitudinal direction and in a transverse direction, respectively, the light-emitting elements being selected in a manner such that differences between luminescence intensity of the light-emitting elements and the target luminescence intensity are substantially equal and are away from the target luminescence intensity in directions reverse to each other, respectively. - View Dependent Claims (21)
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Specification