LIGHT GUIDE PLATE AND SURFACE LIGHT SOURCE DEVICE
First Claim
1. A light guide plate comprising:
- an incident surface on which light outputted from a plurality of point light sources is incident;
an outgoing surface from which light incident from the incident surface is outputted; and
a reflection-and-propagation surface at which the light incident from the incident surface is reflected so as to be propagated toward the outgoing surface, the reflection-and-propagation surface being opposed to the outgoing surface, whereina plurality of prism grooves extending parallel to the incident surface are formed in the reflection-and-propagation surface,a flat surface portion is formed in a propagation region of the outgoing surface adjacent to the incident surface, anda plurality of prism protrusions extending orthogonal to the incident surface are formed in a diffusion-and-propagation region of the outgoing surface adjacent to the propagation region, each of the prism protrusions including a protrusion having a curved portion at its upper end.
1 Assignment
0 Petitions
Accused Products
Abstract
A light guide plate includes an incident surface on which light outputted from point light sources is incident and an outgoing surface for outputting light incident from the incident surface, wherein a reflection-and-propagation surface for reflecting light toward the outgoing surface is formed in a back surface opposite to the outgoing surface. The outgoing surface is made up of a propagation region adjacent to the incident surface, a diffusion-and-propagation auxiliary region adjacent to the propagation region, and a diffusion-and-propagation region adjacent to the diffusion-and-propagation auxiliary region. Hot spots and bright/dark lines in vicinities of the incident surface are controlled primarily by curved portions of prism upper ends formed in the diffusion-and-propagation region, and viewing-angle characteristics of the light guide plate are controlled primarily by linear portions of the prisms.
6 Citations
8 Claims
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1. A light guide plate comprising:
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an incident surface on which light outputted from a plurality of point light sources is incident; an outgoing surface from which light incident from the incident surface is outputted; and a reflection-and-propagation surface at which the light incident from the incident surface is reflected so as to be propagated toward the outgoing surface, the reflection-and-propagation surface being opposed to the outgoing surface, wherein a plurality of prism grooves extending parallel to the incident surface are formed in the reflection-and-propagation surface, a flat surface portion is formed in a propagation region of the outgoing surface adjacent to the incident surface, and a plurality of prism protrusions extending orthogonal to the incident surface are formed in a diffusion-and-propagation region of the outgoing surface adjacent to the propagation region, each of the prism protrusions including a protrusion having a curved portion at its upper end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification
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- Resources
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Current AssigneePanasonic Corporation (Panasonic Holdings Corporation)
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Original AssigneePanasonic Corporation (Panasonic Holdings Corporation)
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InventorsKIKUCHI, Takanori, ITO, Masami, FUJITA, Masaru, KUSAKA, Yusuke
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current362/607
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CPC Class CodesG02B 6/0038 Linear indentations or groo...G02B 6/0045 by shaping at least a porti...G02B 6/0068 Arrangements of plural sour...
