Surface light source device and liquid crystal display

Details Surface light source device and liquid crystal display Surface light source device and liquid crystal display

2005-05-17

2005-05-17

Nguyen, Dung T. (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

C349S064000, C362S035000

Reexamination Certificate

active

06894740

ABSTRACT:
Provided are surface light source devices and LCDs having isotropic and wide viewing angles. A surface light source device for illuminating an LCD comprises a light guide plate hiving a back face provided with a great number of micro-reflectors. Light beams P1, P2representing an inner input light are inner-reflected by first and then second inner reflection faces or in inverse order, respectively to become a first and second inner output lights Q1and Q2which are non-parallel to each other, providing an emission having angular intensity characteristics showing two peaks. Peak splitting of the emission is dissolved by a light diffusion sheet disposed along an emission face of the light guide plate, causing an LCD panel to be illuminated by an isotropic and wide-view-angled illumination output light. The first and second inner reflection faces may be inclined oppositely and symmetrically to each other with respect to an imaginary reference plane that passes a valley bottom of a micro-reflector and extends perpendicularly to the emission face.

REFERENCES:
patent: 5961198 (1999-10-01), Hira et al.
patent: 6305811 (2001-10-01), Beeson et al.
patent: 6530671 (2003-03-01), Mori et al.

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