Light guide plate, light source device equipped therewith and display device
First Claim
1. A light guide plate comprising:
- a light incidence portion having a light incidence surface on where light emitted from a point source of light falls;
a light reflection surface formed facing the light incidence surface to reflect light from the light incidence surface;
a light outgoing surface arranged between the light incidence surface and the light reflection surface, and having a circularly polarizing plate intimately adhered onto the surface thereof;
an opposing surface formed facing the light outgoing surface and in which there are alternately arranged first opposing surfaces for guiding the incident light to the light reflection surface with the light outgoing surface, and second opposing surfaces for emitting the light reflected by the light reflection surface through the light outgoing surface; and
side end surfaces arranged between the light incidence surface and the light reflection surface, and are formed at both ends of the light outgoing surface and of the opposing surface.
3 Assignments
0 Petitions
Accused Products
Abstract
A display device used for a display unit of portable electronic equipment, a light source device therefor and a light guide plate, suppressing dispersion in the brightness and featuring a high contrast and a good display quality. The constitution includes a light incidence surface on where light emitted from an LED falls, a light reflection surface formed facing the light incidence surface and reflects light from the light incidence surface, a light outgoing surface arranged between the light incidence surface and the light reflection surface, and has a circularly polarizing plate intimately adhered onto the surface thereof, and an opposing surface formed facing the light outgoing surface and in which there are alternately arranged first opposing surfaces for guiding the incident light to the light outgoing surface as well as to the light reflection surface, and second opposing surfaces for emitting the light reflected by the light reflection surface through the light outgoing surface.
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Citations
23 Claims
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1. A light guide plate comprising:
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a light incidence portion having a light incidence surface on where light emitted from a point source of light falls;
a light reflection surface formed facing the light incidence surface to reflect light from the light incidence surface;
a light outgoing surface arranged between the light incidence surface and the light reflection surface, and having a circularly polarizing plate intimately adhered onto the surface thereof;
an opposing surface formed facing the light outgoing surface and in which there are alternately arranged first opposing surfaces for guiding the incident light to the light reflection surface with the light outgoing surface, and second opposing surfaces for emitting the light reflected by the light reflection surface through the light outgoing surface; and
side end surfaces arranged between the light incidence surface and the light reflection surface, and are formed at both ends of the light outgoing surface and of the opposing surface. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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2. A light guide plate comprising:
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a light incidence portion having a light incidence surface on which light emitted from a point source of light falls;
a light reflection surface formed in a parabolic shape facing the light incidence surface with the position where the point source of light is arranged as a focal point, and reflects light from the light incidence surface;
a light outgoing surface arranged between the light incidence surface and the light reflection surface;
an opposing surface formed facing the light outgoing surface and in which there are alternately arranged first opposing surfaces for guiding the incident light to the light reflection surface with the light outgoing surface, and second opposing surfaces for emitting the light reflected by the light reflection surface through the light outgoing surface; and
side end surfaces arranged between the light incidence surface and the light reflection surface, and are formed at both ends of the light outgoing surface and of the opposing surface. - View Dependent Claims (3)
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13. A light source device comprising:
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a point source of light for emitting light; and
a light guide plate for guiding light;
wherein the light guide plate comprises a light incidence portion having a light incidence surface on where light emitted from the point source of light falls;
a light reflection surface formed facing the light incidence surface to reflect light from the light incidence surface;
a light outgoing surface arranged between the light incidence surface and the light reflection surface, and having a circularly polarizing plate intimately adhered onto the surface thereof;
an opposing surface formed facing the light outgoing surface and in which there are alternately arranged first opposing surfaces for guiding the incident light to the light reflection surface with the light outgoing surface, and second opposing surfaces for emitting the light reflected by the light reflection surface through the light outgoing surface; and
side end surfaces arranged between the light incidence surface and the light reflection surface, and are formed at both ends of the light outgoing surface and of the opposing surface.
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14. A light source device comprising:
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a plurality of point sources of light arranged maintaining a predetermined distance L to emit light;
a light-mixing region having a predetermined width D in a direction in which light travels to mix the rays of light emitted from the plurality of point sources of light; and
a planar light source region having a light outgoing surface for emitting the rays of light mixed in the light-mixing region. - View Dependent Claims (15, 16, 17, 18)
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19. A light source device comprising:
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a plurality of point sources of light arranged maintaining a predetermined distance to emit light;
a light incidence portion arranged neighboring the plurality of point sources of light and having a light incidence surface on where the light falls;
a light reflection surface formed facing the light incidence surface and reflects the light;
a light outgoing surface for emitting the light reflected by the light reflection surface; and
an opposing surface formed facing the light outgoing surface and in which there are alternately arranged first opposing surfaces to guide light incident on the light incidence surface to the light reflection surface, and second opposing surfaces for reflecting the light reflected by the light reflection surface so as to be emitted through the light outgoing surface.
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20. A light source device comprising:
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a plurality of linear sources of light for emitting light;
a light incidence portion arranged neighboring the plurality of linear sources of light and having a plurality of light incidence surfaces on where the light falls;
a light outgoing surface for emitting the light; and
an opposing surface formed facing the light outgoing surface and in which there are arranged first opposing surfaces for guiding light and second opposing surfaces for reflecting the light so as to be emitted through the light outgoing surface.
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21. A display device comprising:
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a display panel having pixels arranged like a matrix; and
a light source device for illuminating the display panel;
wherein the light source device comprises a point source of light for emitting light; and
a light guide plate for guiding light;
wherein the light guide plate comprises a light incidence portion having a light incidence surface on where light emitted from the point source of light falls;
a light reflection surface formed facing the light incidence surface to reflect light from the light incidence surface;
a light outgoing surface arranged between the light incidence surface and the light reflection surface, and having a circularly polarizing plate intimately adhered onto the surface thereof;
an opposing surface formed facing the light outgoing surface and in which there are alternately arranged first opposing surfaces for guiding the incident light to the light reflection surface with the light outgoing surface, and second opposing surfaces for emitting the light reflected by the light reflection surface through the light outgoing surface; and
side end surfaces arranged between the light incidence surface and the light reflection surface, and are formed at both ends of the light outgoing surface and of the opposing surface. - View Dependent Claims (22, 23)
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Specification