Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2006-08-01
2006-08-01
Amari, Alessandro (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C362S617000, C349S065000
Reexamination Certificate
active
07085056
ABSTRACT:
A light guide plate (20) has a light incidence surface (221) for receiving light, a light emitting surface (223) for emitting light, and a bottom surface (222). The light emitting surface has a plurality of diffraction grating units. Each diffraction grating unit has a strong diffractive portion and a weak diffractive portion. In each diffraction grating unit, grating directions of the strong and weak diffractive portions are orthogonal to each other. Area ratios of the strong diffractive portions in the diffraction grating units progressively increase with increasing distance away from the light incidence surface. The grating directions of the strong diffractive portions may vary according to the locations of the diffraction grating units relative to a light source. These features improve the overall efficiency of utilization of light, and enable the light emitting surface to output highly uniform light.
REFERENCES:
patent: 5703667 (1997-12-01), Ochiai
patent: 6250767 (2001-06-01), Kusafuka et al.
patent: 6612720 (2003-09-01), Beadle
patent: 6879355 (2005-04-01), Kim
Chen Ga-Lane
Leu Charles
Yu Tai-Cherng
Amari Alessandro
Hon Hai Precision Industry Co. Ltd.
Morris Manning & Martin
Tingkang Xia, Esq. Tim
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