Liquid crystal cells – elements and systems – Particular structure – Particular illumination
Reexamination Certificate
2008-07-25
2011-10-18
Doan, Jennifer (Department: 2874)
Liquid crystal cells, elements and systems
Particular structure
Particular illumination
C349S056000, C349S061000, C349S063000, C349S064000
Reexamination Certificate
active
08040459
ABSTRACT:
A backlight (illuminating device) of the present invention is a tandem type backlight including a plurality of light-emitting units (11) including at least one point light source (5) and a light guide plate (7) for causing light from the at least one point light source to be diffused and surface-emitted. In each of the light-emitting units (11), a length X of a light guide area (9) is set so that an area, on a boundary surface between a light-emitting area (10) and the light guide area (9), of a cross-section of a light beam that is emitted from the at least one point light source (5) and is diffused in the light guide plate (7) is equal to or larger than an area of the boundary surface (interface). Moreover, a length X, in a length direction D1, of the light guide area is smaller than a length Y, in the length direction D1, of the light-emitting area, the length direction being a direction pointing from the at least one point light source (5) toward the light-emitting area (10). With this, it is possible to realize an illuminating device in which light from a light source can be more uniformly emitted, and an increase in thickness of the illuminating device can be suppressed.
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International Search Report for PCT/JP2008/063447, mailed Sep. 9, 2008.
Supplementary EP Search Report mailed Mar. 23, 2011 in EP application 08791691.2.
Ajichi Yuhsaku
Masuda Takeshi
Doan Jennifer
Nixon & Vanderhye P.C.
Sharp Kabushiki Kaisha
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