Corner supply type plane light source device

Details Corner supply type plane light source device Corner supply type plane light source device

1995-05-16

1996-06-18

Healy, Brian

Optical waveguides

Integrated optical circuit

385 88, 385 89, 385 39, 385129, 385130, 385901, 362 31, G02B 612, G02B 610, F21V 704

Patent

active

055287093

ABSTRACT:
A corner supply type plane light source device having a simple structure and capable of forming a uniform luminescent part with a small power consumption is disclosed. The corner supply type plane light source device comprises a flat-plate light-scattering light guide 1, diffusion reflective sheets 2, 4, and LEDs 3 disposed at corners. The light-scattering light guide 1 is composed of a material provided with a uniform scattering power, and the effective scattering irradiation parameter E and the correlation distance a satisfy the conditions of 9.ltoreq.E[cm.sup.-1 ].ltoreq.100 and 0.06.ltoreq.a[.mu.m].ltoreq.35. Turning on the LEDs 3, light is supplied from each corner. The LED radiation light having directivity immediately undergoes the scattering in the light-scattering light guide 1 and the propagation direction is expanded in the lateral and vertical directions, and also undergoes the internal reflection on the bottom 12 and sides 13, and diffusion reflection by the diffusion reflective sheets 2, 4. As a result, the light propagates throughout the entire light-scattering light guide 1. The light surpassing the critical conditions on the light exit surface 11 through this process is emitted from the light exit surface 11 to provide a light flux F. (Representative drawing) FIG. 4

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Front Page of WO 93/06509, including Abstract. (Apr./93).

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