Liquid crystal cells – elements and systems – Particular structure – Particular illumination
Patent
1996-12-02
1998-03-03
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Particular illumination
362339, G02F 11335
Patent
active
057241082
ABSTRACT:
Between the liquid crystal display panel and the backlight is arranged a prism sheet whose upper surface forms a prism surface and lower surface forms a smooth surface. The cross section of the prism surface is scalene triangles. Each of the scalene triangles is so shaped that if its base angles are taken to be .theta.1 and .theta.2, the relationship of 25 degrees.ltoreq..theta.1<45 degrees and 45 degrees.ltoreq..theta.2<90 degrees hold and that the prism surface on the base angle .theta.1 side faces in the direction of a wider viewing angle characteristic of the liquid crystal display panel. In this construction, because the emitted light can be converged in an optimum range of viewing angle of the liquid crystal display panel, it is possible to increase the brightness of the backlight with the same power consumption as used in the conventional apparatus and to reduce power consumption of the backlight.
REFERENCES:
patent: 5408344 (1995-04-01), Takiguchi et al.
patent: 5414599 (1995-05-01), Kaneko et al.
patent: 5467417 (1995-11-01), Nakamura et al.
Hitachi , Ltd.
Miller Charles
Sikes William L.
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