To provide a light guide plate in which light utilization efficiency is high, light with less brightness unevenness can be emitted, and brighter distribution of light can be obtained in the vicinity of the center part compared with the peripheral part of the display screen.
The light guide plate has a rectangular light-emitting face, a light incident face to make the light incident that advances nearly in a parallel direction with the light-emitting face, a rear face on the opposite side to the light-emitting face, and scattered particles dispersed inside the interior. The light guide plate has two or more layers piled up in nearly a perpendicular direction to the light-emitting face with different particle concentrations of scattered particles. A first layer on the light-emitting face side in which particle concentration is Npo and a second layer in which particle concentration is Npr and positioned on the rear face side than the first layer are included, and a relation of Npo<Npr is satisfied. Cross-sectional shape in the perpendicular direction to the light incident face has a recessed shape on the light-emitting face side. The light guide plate is provided by making the synthesized particle concentration vary in the perpendicular direction to the light incident face of the light guide plate, by making the thickness vary in the nearly perpendicular direction to the light-emitting face in the first and the second layers of the light guide plate.
| JP2001110220A | 2001-04-20 | |||
| JP2009158201A | 2009-07-16 | |||
| JP2007171681A | 2007-07-05 | |||
| JP2004055327A | 2004-02-19 | |||
| JPH09211234A | 1997-08-15 |
Haruko Sanwa
Hideaki Ito
Fumio Mitsuhashi