LCD device including an illumination device having a polarized light separating sheet between a light guide and the display
First Claim
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1. An illumination device for a direct viewing type display element, comprising:
- a flat light guide;
a light source set such that light is incident on a side portion of said flat light guide;
a polarized light separating sheet set on a light emitting side of the flat light guide for transmitting a p polarized light component and reflecting at least a portion of an s polarized light component with respect to a light ray substantially having a predetermined direction of incidence; and
a light reflecting sheet disposed on another side opposite to and facing said light emitting side of the flat light guide in parallel with the emitting side, said light reflecting sheet converting said portion of s polarized light component reflected by said polarized light separating sheet into p polarized light and reflecting the converted p polarized light to said polarized light separating sheet for transmission of the converted p polarized light through said polarized light separating sheet in overlapping relationship with the p polarized light component.
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Abstract
An illumination device for a direct viewing type display element comprising a flat light guide; a light source set such that light is incident on a side portion of said flat light guide; a polarized light separating flat set on a first side of a light emitting side of the flat light guide for transmitting a p polarized light component and reflecting at least a portion of an s polarized light component with respect to a light ray substantially having a predetermined direction of incidence; and a light reflecting sheet disposed on a second side opposite to said light emitting side of the flat light guide in parallel with the light emitting site.
219 Citations
18 Claims
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1. An illumination device for a direct viewing type display element, comprising:
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a flat light guide; a light source set such that light is incident on a side portion of said flat light guide; a polarized light separating sheet set on a light emitting side of the flat light guide for transmitting a p polarized light component and reflecting at least a portion of an s polarized light component with respect to a light ray substantially having a predetermined direction of incidence; and a light reflecting sheet disposed on another side opposite to and facing said light emitting side of the flat light guide in parallel with the emitting side, said light reflecting sheet converting said portion of s polarized light component reflected by said polarized light separating sheet into p polarized light and reflecting the converted p polarized light to said polarized light separating sheet for transmission of the converted p polarized light through said polarized light separating sheet in overlapping relationship with the p polarized light component. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An illumination device for a direct viewing type display element, comprising:
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a flat light emitting means for emitting a diffused light including a first polarized light component having a first direction of polarization and a second polarized light component having a second direction of polarization perpendicular to the first direction of polarization; and a polarized light converting and emitting means disposed in an optical path of a light emitted from said flat light emitting means for emitting said first polarized light component and for emitting, in overlapping relationship with the emitted first polarized light component, at least a portion of said second polarized light component after selectively converting said portion of said second polarized light component into the first polarized light component.
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9. An illumination device for a direct viewing type display element, comprising:
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a flat light guide; a light source set such that light is incident on a side portion of said flat light guide; a polarized light separating sheet set on a light emitting side of the flat light guide for transmitting a p polarized light component and reflecting at least a portion of an s polarized light component with respect to light rays substantially having a predetermined direction of incidence; and a light reflecting sheet disposed on another side opposite to and facing said light emitting side of the flat light guide in parallel with the emitting side, said light reflecting sheet converting said portion of s polarized light component reflected by said polarized light separating sheet into p polarized light and reflecting the converted p polarized light to said polarized light separating sheet for transmission of the converted p polarized light through said polarized light separating sheet in overlapping relationship with the p polarized light component. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. An illumination device for a direct viewing type display element, comprising:
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a flat light guide; a light source set such that light is incident on a side portion of said flat light guide; a polarized light separating sheet set on a light emitting side of the flat light guide for transmitting a p polarized light component and reflecting at least a portion of an s polarized light component with respect to a light ray substantially having a predetermined direction of incidence; and a light reflecting sheet disposed on another side opposite to and facing said light emitting side of the flat light guide in parallel with the emitting side, wherein said polarized light separating sheet is planar and parallel to the light emitting side of the flat light guide and is set in proximity to the flat light guide in the light emitting direction.
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Specification