Title:
LIGHTING DEVICE, AND ELECTRO-OPTICAL DEVICE AND ELECTRIC APPARATUS EQUIPPED WITH THE SAME AS FRONT LIGHT
Document Type and Number:
Japanese Patent JP3968907
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To suppress the deterioration of visibility and improve the performance of a planar light emitting body by controlling the leaking direction of leakage light from a surface of a light guide plate.
SOLUTION: The plate surface of the light guide plate 12 is provided with surface sections 12b-1 facing obliquely upward, and surface sections 12b-2 facing obliquely downward. Since the surface sections 12b-1, 12b-2, respectively, form the leakage light 12B-1, 12B-2 the azimuth components of which on the plate surface of the light guide plate 12 deviate from the main viewing direction F; the azimuth distribution of the leakage light 12B varies from that of conventional structures, and the peak azimuths of the leakage light are formed on both sides of the viewing direction F, respectively, and also both the peak strengths remarkably decrease.
Inventors:
Keishi Wada
Application Number:
JP6850099A
Publication Date:
August 29, 2007
Filing Date:
March 15, 1999
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
F21V8/00; G02B6/00; G02F1/1335; G02F1/13357; (IPC1-7): F21V8/00; G02B6/00; G02F1/13357
Domestic Patent References:
| JP11024586A | ||||
| JP8278413A |
Attorney, Agent or Firm:
Suzuki Kisaburo
Masahiko Ueyanagi
Osamu Suzawa
Masahiko Ueyanagi
Osamu Suzawa