Surface light source for emitting light from two surfaces and double-sided display device using the same
First Claim
1. A display apparatus comprising:
- a flat backlight including a light source which emits light and a light guide plate having an end face facing the light source and two opposing surfaces, wherein the light from the light source is incident on the end face, and is partially guided in the light guide plate while being internally reflected by the two opposing surfaces, so as to partially emerge from the two opposing surfaces;
a first optical element, which is disposed on a side of a first one of the two opposing surfaces, and which partially transmits the light emerged from the first opposing surface toward a front side, and partially returns the light to a rear side;
a second optical element, which is disposed on a side of a second one of the two opposing surfaces, and which transmits at least a part of the light emerged from the second opposing surface;
a first liquid crystal display which has a front side and a back side and two polarizing plates disposed on the front side and the back side, respectively, and which is disposed on a side of the first optical element; and
a second liquid crystal display which has a front side and a back side and two polarizing plates disposed on the front side and the back side, respectively, and which is disposed on a side of the second optical element.
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Accused Products
Abstract
A surface light source device includes a light-emitting element which generates light, and a light guide plate which, causes light emitted from the light-emitting element to be incident from an end face, causes the light to be reflected between opposite plate surfaces to guide the light along the plate surfaces and make the light emerge from the plate surfaces, and transmits light incident from one plate surface toward the other plate surface. A first optical element is placed on one plate surface side of the light guide plate, transmits part of light emerging from one plate surface of the light guide plate toward a front side, and returns the remaining light to a rear side. A second optical element is placed on the other plate surface side and transmits at least part of light emerging from the other plate surface side.
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Citations
32 Claims
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1. A display apparatus comprising:
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a flat backlight including a light source which emits light and a light guide plate having an end face facing the light source and two opposing surfaces, wherein the light from the light source is incident on the end face, and is partially guided in the light guide plate while being internally reflected by the two opposing surfaces, so as to partially emerge from the two opposing surfaces; a first optical element, which is disposed on a side of a first one of the two opposing surfaces, and which partially transmits the light emerged from the first opposing surface toward a front side, and partially returns the light to a rear side; a second optical element, which is disposed on a side of a second one of the two opposing surfaces, and which transmits at least a part of the light emerged from the second opposing surface; a first liquid crystal display which has a front side and a back side and two polarizing plates disposed on the front side and the back side, respectively, and which is disposed on a side of the first optical element; and a second liquid crystal display which has a front side and a back side and two polarizing plates disposed on the front side and the back side, respectively, and which is disposed on a side of the second optical element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A display apparatus comprising:
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a flat backlight including a light source which emits light and a light guide plate having an end face facing the light source, a front surface, and a back surface opposed to the front surface, wherein the light from the light source is incident on the end face, and is partially guided in the light guide plate while being internally reflected by the front and back surfaces, so as to partially emerge from the front and back surfaces; a first optical element, which includes a polarizing/separatinq layer, and which is disposed on a side of the front surface of the light guide plate to partially transmit the light emerged from the front surface of the light guide plate toward an outside and to partially return the light to the light guide plate; a second optical element, which includes a polarizing/separating layer, and which is disposed on a side of the back surface of the light guide plate to partially transmit the light emerged from the back surface of the light guide plate toward an outside and to partially return the light to the light guide plate; a first liquid crystal display, which has a front side and a back side opposed to the front side and two polarizing plates disposed on the front side and the back side, respectively, and which is disposed on a side of the first optical element such that the back side faces the first optical element; and a second liquid crystal display, which has a front side and a back side opposed to the front side and two polarizing plates disposed on the front side and the back side, respectively, and which is disposed on a side of the second optical element such that the back side faces the second optical element. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A display apparatus comprising:
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a flat backlight including a light source which emits light and a light guide plate having an end face facing the light source, a front surface, and a back surface opposed to the front surface, wherein the light from the light source is incident on the end face, and is partially guided in the light guide plate while being internally reflected by the front and back surfaces, so as to partially emerge from the front and back surfaces; a first optical element, which has a transmission axis and reflection axis, and which is disposed on a side of the front surface of the light guide plate to partially transmit the light emerged from the front surface of the light guide plate toward an outside and to partially return the light to the light guide plate; a second optical element, which has a transmission axis and reflection axis, and which is disposed on a side of the back surface of the light guide plate to partially transmit the light emerged from the back surface of the light guide plate toward an outside and to partially return the light to the light guide plate; a first liquid crystal display, which has a front side and a back side opposed to the front side and two polarizing plates that include a transmission axis and are disposed on the front side and the back side of the first liquid crystal display, respectively, and which is disposed on a side of the first optical element such that the back side faces the first optical element; and a second liquid crystal display, which has a front side and a back side opposed to the front side and two polarizing plates that include a transmission, axis and are disposed on the front side and the back side of the second liquid crystal display, respectively, and which is disposed on a aide of the second optical element such that the back side faces the second optical element. - View Dependent Claims (29, 30, 31, 32)
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Specification