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Title:
LENS ARRANGING SHEET, SURFACE LIGHT SOURCE AND TRANSMISSION TYPE DISPLAY
Document Type and Number:
Japanese Patent JP3732251
Kind Code:
B2
Abstract:

PURPOSE: To provide a lens arranging sheet which is uniformly bright and improves the utilization efficiency of light for a back light to be used for a liquid crystal display device of a transmission type, etc., and a surface light source of an edge light type and transmission type display formed by using the same.
CONSTITUTION: This lens arranging sheet has lens arrangement 4 formed by one- or two- dimensionally arranging unit lens on the front surface side of a transparent base material 31. The rear surface side is provided with micro projection groups 2 arranged with many microprojections 21 which are prism-shaped and of which the lengths on the respective sides are above the wavelength of light source light and below 500μm to random two-dimensional distributions by rearrangement attained by adding random numbers to the regular grating point coordinates of two-dimensional gratings on the entire surface and correcting these coordinates. There is also the constitution in which the microprojections 21 are formed as rectangular parallelepipeds and the intersection lines where the flanks of the rectangular parallelepipeds and the horizontal plane of the lens arranging sheet intersect are non-parallel with the intersection lines where the plane of the unit lenses and the horizontal plate intersect. The surface light source has such lens arranging sheet. The transmission type display has such surface light source.


Inventors:
Toshikazu Nishio
Hisanori Ishida
Application Number:
JP14238695A
Publication Date:
January 05, 2006
Filing Date:
May 18, 1995
Export Citation:
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Assignee:
Dai Nippon Printing Co.,Ltd.
International Classes:
G02B3/00; G02B6/00; G02F1/1335; G02F1/13357; G09F9/00; (IPC1-7): G02B6/00; G02F1/1335; G09F9/00; G09F9/00
Domestic Patent References:
JP8075928A
JP6258641A
JP6324205A
JP8054517A
JP7151909A
JP6010901U
Attorney, Agent or Firm:
Satoshi Kanayama