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US 2013/0258707 A1Published application
Light guide plate, planar lighting device, and liquid crystal display device
AssigneeFUJIFILM Corporation
InventorOsamu IWASAKI
Life of this patent
Estimating the term…
Abstract
The light guide plate has at least two layers which are superposed on each other in the direction almost perpendicular to the light exit surface and contain the scattering particles at different particle concentrations, the scattering particles are polydisperse particles including a mixture of particles with different particle sizes, and the combined particle concentrations in each portion of the light guide plate is different by changing the thicknesses of the first layer and the second layer in the direction almost perpendicular to the exit surface.
Claims20
A light guide plate comprising:
- a rectangular light exit surface;
- at least one light incidence surface which is provided on at least one end side of said light exit surface and through which light traveling in a direction substantially parallel to said light exit surface enters;
- a rear surface on an opposite side from said light exit surface;
- and scattering particles dispersed in said light guide plate,
- wherein said scattering particles are polydisperse particles including a mixture of particles with different particle sizes,
- wherein said light guide plate includes two or more layers superposed on each other in a direction substantially perpendicular to said light exit surface and containing said scattering particles at different particle concentrations,
- wherein said two or more layers include at least, a first layer disposed on a side closer to said light exit surface and having a particle concentration Npo and a second layer disposed on a side closer to said rear surface than said first layer and having a particle concentration Npr, and Npo and Npr satisfy a relationship expressed by Npo<Npr,
- wherein a cross section in a direction perpendicular to said at least one light incidence surface extending from said at least one light incidence surface toward a central portion of said light exit surface has a concave shape toward a light exit surface side, and
- wherein a combined particle concentration in each portion of said light guide plate is changed by changing a thickness of said first layer and a thickness of said second layer in the direction substantially perpendicular to said light exit surface.
6 more elements
A light guide plate comprising:
- a rectangular light exit surface;
- at least one light incidence surface which is provided on at least one end side of said light exit surface and through which light traveling in a direction substantially parallel to said light exit surface enters;
- a rear surface provided on an opposite side from said light exit surface;
- and scattering particles dispersed in said light guide plate,
- wherein said scattering particles are polydisperse particles including a mixture of particles with different particle sizes,
- wherein said light guide plate includes two or more layers superposed on each other in a direction substantially perpendicular to said light exit surface and containing said scattering particles at different particle concentrations,
- wherein said two or more layers include at least, a first layer disposed on a side closer to said light exit surface and having a particle concentration Npo and a second layer disposed on a side closer to said rear surface than said first layer and having a particle concentration Npr, and Npo and Npr satisfy a relationship expressed by Npo<Npr, and
- wherein a thickness of said second layer once changes so as to decrease with increasing distance from said at least one light incidence surface and then continuously changes so as to increase.
5 more elements
Dependencies are inferred from the claim text.