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, the outgoing surface being orthogonal to the incident surface; 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 and being orthogonal to the incident 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.
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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.
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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, the outgoing surface being orthogonal to the incident surface; 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 and being orthogonal to the incident 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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Primary Examiner(s)Green, Tracie Y
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Application NumberUS13/926,181Publication NumberTime in Patent Office504 DaysField of Search362/607, 362/609, 362/499, 349/62US Class Current362/626CPC Class CodesG02B 6/0038 Linear indentations or groo...G02B 6/0045 by shaping at least a porti...G02B 6/0068 Arrangements of plural sour...
