G - Physics – 02 – F
Patent
G - Physics
02
F
G02F 1/13357 (2006.01) G02B 6/00 (2006.01)
Patent
CA 2520656
The present invention realizes the backlight apparatus which can generates the light with an angle spread or an angle less than 10 degrees FWHM, which can reduce a fabrication cost, and which can improve the efficiency of usage of the light from the light source. A backlight apparatus comprises: a wedge type light guide of a refractive index n1, having a top surface, a bottom surface and a side surface; a light source for directing light to said side surface of said wedge type light guide; a first light transmission layer of a refractive index n2, which is smaller than said refractive index n1, having a top surface and a bottom surface, wherein said top surface of said first light transmission layer is attached to said bottom surface of said wedge type light guide; and a plurality of prisms attached on said top surface of said light transmission layer for directing the incident light from said light transmission layer toward a light path along a direction of a normal line of said top surface of said light transmission layer.
Nishikai Akiko
Taira Yochi
Yamada Fumiaki
Au Optronics Corporation
Gowling Lafleur Henderson Llp
International Business Machines Corporation
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