A light guide apparatus, a backlight apparatus and a liquid...

G - Physics – 02 – F

Patent

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Details

G02F 1/13357 (2006.01) F21V 8/00 (2006.01) G02B 6/00 (2006.01) G02F 1/13 (2006.01) G02F 1/1335 (2006.01) G09F 9/00 (2006.01)

Patent

CA 2317820

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 light deflecting layer having a top surface attached to said bottom surface of said first light transmission layer for deflecting the incident light from said first light transmission layer toward said top surface of said wedge type light guide.

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