Planar light source, display device, portable terminal...

Details Planar light source, display device, portable terminal... Planar light source, display device, portable terminal...

2008-01-28

2009-12-08

Heyman, John (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

C349S062000, C349S065000

Reexamination Certificate

active

07630026

ABSTRACT:
A planar light source includes a large variable width of an irradiation angle of illumination light, a display device having a large variable width of an angle of field that uses the planar light source, a portable terminal device that uses the display device, and a ray direction switching element that is incorporated in the planar light source. A beam direction regulating element (a louver), which controls a direction of light, and a transparent and scattering switching element, which can switch the transparent state and the scattering state according to ON and OFF of an applied voltage, are provided between a backlight and a liquid crystal panel, whereby it is possible to increase a variable width of an irradiation angle of light in the planar light source and increase a variable width of an angle of field of the liquid crystal display device that uses the planar light source.

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State Intellectual Property Office of People's Republic of China, First Office Action, Feb. 9, 2007 (with English translation).
Japanese Office Action dated Sep. 9, 2008 with Partial English-Language Translation.

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