PRISM SHEET, BACK LIGHT UNIT USING THE PRISM SHEET, AND TRANSMISSIVE LIQUID CRYSTAL DISPLAY DEVICE

Title:

PRISM SHEET, BACK LIGHT UNIT USING THE PRISM SHEET, AND TRANSMISSIVE LIQUID CRYSTAL DISPLAY DEVICE

Document Type and Number:

WIPO Patent Application WO/2003/040784

Kind Code:

A1

Abstract:

A prism sheet, a back light unit using the prism sheet, and a transmissive liquid crystal display device. The prism sheet (10) converts the propagation direction of the light (L)incident with the intensity distribution of a predetermined angular range by means of reflection. A reflecting surface which is extended from a base part (12) to a top part (18a) of the sheet and performs total reflection of the light (L) comprises a higher−order surface (18) including at least a surface of small curvature and a surface separate from the surface of small curvature.

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Inventors:

KOHARA SAYURI (JP)
YAMADA FUMIAKI (JP)
NAKANO DAIJU (JP)

Application Number:

PCT/JP2002/011537

Publication Date:

May 15, 2003

Filing Date:

November 05, 2002

Export Citation:

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Assignee:

IBM (US)
KOHARA SAYURI (JP)
YAMADA FUMIAKI (JP)
NAKANO DAIJU (JP)

International Classes:

F21V8/00; G02B5/04; G02F1/1335; G02B6/00; G02F1/13357; (IPC1-7): G02B5/02; G02B5/04; G02F1/3357

Foreign References:

JPH10261309A	1998-09-29
JPH1138209A	1999-02-12
JPH07294709A	1995-11-10
JPH08254606A	1996-10-01
JPH095505A	1997-01-10

Other References: