LIGHT GUIDE PLATE
First Claim
Patent Images
1. A light guide plate comprising:
- a rectangular light exit surface;
a light incidence surface that is disposed on an end face of the light exit surface and on which light traveling in a direction substantially parallel to the light exit surface is incident;
a rear surface that is opposite to the light exit surface;
scattering particles that are dispersed therein; and
two layers that overlap each other in a direction perpendicular to the light exit surface,wherein the two layers are a first layer disposed on a light exit surface side and a second layer disposed on a rear surface side and having a higher particle concentration of the scattering particles than that of the first layer,wherein thicknesses of the two layers in the direction substantially perpendicular to the light exit surface vary in a direction perpendicular to the light incidence surface to change a combined particle concentration, andwherein when a thickness of the light guide plate in the direction perpendicular to the light exit surface is defined as Tlg and the thickness at a center of the second layer is defined as tcen, conditional expressions of 0.3 mm≦
Tlg≦
4 mm and 0.3≦
tcen/Tlg≦
1 are satisfied.
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Accused Products
Abstract
The light guide plate includes two layers having different particle concentrations, in which the thicknesses of the two layers are varied to change the combined particle concentration of the light guide plate, and conditional expressions of 0.3 mm≦Tlg≦4 mm and 0.3≦tcen/Tlg≦1 are satisfied when the thickness in the direction perpendicular to the light exit surface is defined as Tlg and the thickness at the center of the second layer is defined as Tcen. The light guide plate of the present invention can have a large and thin shape, can emit light having high light use efficiency and small luminance unevenness, can obtain a middle-high or bell-shaped brightness distribution and can be easily manufactured.
18 Citations
19 Claims
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1. A light guide plate comprising:
- a rectangular light exit surface;
a light incidence surface that is disposed on an end face of the light exit surface and on which light traveling in a direction substantially parallel to the light exit surface is incident;
a rear surface that is opposite to the light exit surface;
scattering particles that are dispersed therein; and
two layers that overlap each other in a direction perpendicular to the light exit surface,wherein the two layers are a first layer disposed on a light exit surface side and a second layer disposed on a rear surface side and having a higher particle concentration of the scattering particles than that of the first layer, wherein thicknesses of the two layers in the direction substantially perpendicular to the light exit surface vary in a direction perpendicular to the light incidence surface to change a combined particle concentration, and wherein when a thickness of the light guide plate in the direction perpendicular to the light exit surface is defined as Tlg and the thickness at a center of the second layer is defined as tcen, conditional expressions of 0.3 mm≦
Tlg≦
4 mm and 0.3≦
tcen/Tlg≦
1 are satisfied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- a rectangular light exit surface;
Specification
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- Resources
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Current AssigneeFujifilm Corporation (Fujifilm Holdings Corporation)
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Original AssigneeFujifilm Corporation (Fujifilm Holdings Corporation)
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InventorsIWASAKI, Osamu
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Application NumberUS14/217,754Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current362/621CPC Class CodesG02B 6/0016 Grooves, prisms, gratings, ...G02B 6/0041 provided in the bulk of the...G02B 6/0055 Reflecting element, sheet o...G02B 6/0061 to provide homogeneous ligh...G02B 6/0088 of the light guide or other...G02B 6/009 of the light source in the ...
