EP0597261A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
An illumination device and a liquid crystal display device
Assignee: AGC Inc
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Filing: 1993-10-08
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Granted: —
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Expires: 2013-10-08
Abstract
Abstract An illumination device for a direct viewing type display element (12) comprising a flat light guide (3); a light source (1) set such that light is incident on a side portion of said flat light guide (3); a polarized light separating sheet (6) set on a first side of a light emitting site of the flat light guide (3) 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 (5) disposed on a second side opposite to said light emitting site of the flat light guide (3) in parallel with the light emitting site.
Inventors
- 👤 Tomoki C/O Asahi Glass Company Ltd. Gunjima
- 👤 Yoshiharu C/O Ag Technology Co. Ltd. Ooi
- 👤 Masao c/o Asahi Glass Company LTD. Ozeki
- 👤 Hiroaki C/O Asahi Glass Company Ltd. Ito
- 👤 Hiroshi C/O Asahi Glass Company Ltd. Hasebe
- 👤 Tetsuro C/O Asahi Glass Company Ltd. Matsumoto
- 👤 Yutaka C/O Asahi Glass Company Ltd. Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 16:17
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0033; G02B6/0056; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; F; F21; F21V; F21V9/00; F21V9/14; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/13362; G02B6/0035; G02B6/0038; G02B6/005; G02B6/0053; G02B6/0055; G02F1/133528; G02F1/13355; G02F1/133615
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
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 first side of a light emitting site 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 site of the flat light guide in parallel with the light emitting site.
Claim 2
Dependent Claim
113 words
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 first side of a light emitting site 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 site of the flat light guide in parallel with the light emitting site.
Claim 3
Dependent Claim
47 words
The illumination device for a direct viewing type display element according to Claim 1, wherein the polarized light separating sheet is comprising a multi-layered structure wherein light transmitting media having a relatively large refractive index and light transmitting media having a relatively small refractive index are laminated.
Claim 4
Dependent Claim
51 words
The illumination device for a direct viewing type display element according to Claim 1, wherein the polarized light separating sheet comprises a transparent supportor and at least one dielectric thin film laminated on said transparent supportor having a thickness which is equal to or smaller than a wavelength of visible light.
Claim 5
Dependent Claim
32 words
The illumination device for a direct viewing type display element according to Claim 1, wherein the polarized light separating sheet comprises a plurality of laminated transparent polymer layers having different refractive indices.
Claim 6
Dependent Claim
66 words
A liquid crystal display device, wherein the illumination device according to Claim 1 is disposed on a rear side of a direct viewing type liquid crystal display element such that a principle polarization direction of emitted light from the illumination device substantially agrees with a direction of an optical axis of polarization of a polarizing sheet on a light-incident side of a liquid crystal display element.
Claim 7
Dependent Claim
59 words
The liquid crystal display device according to Claim 5 further comprising: a light deflecting means disposed between the polarized light separating sheet and the liquid crystal display element for deflecting a direction of a light ray maximizing a light intensity among light distributing directions to a direction substantially perpendicular to a display face of the liquid crystal display element.
Claim 8
Dependent Claim
36 words
The liquid crystal display device according to Claim 5, further comprising: a means for rotating polarization direction disposed between the illumination device and the liquid crystal display element for rotating the principle direction of emitted light.
Claim 9
Dependent Claim
126 words
An illumination device for a direct viewing type display device comprising: 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; component and a polarized light converting 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 at least a portion of said second polarized light component after converting said portion of the second polarized light component into the first polarized light component selectively with respect to a light ray substantially having a light direction maximizing a brightness thereof.
Claim 10
Dependent Claim
126 words
An illumination device for a direct viewing type display device comprising: 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; component and a polarized light converting 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 at least a portion of said second polarized light component after converting said portion of the second polarized light component into the first polarized light component selectively with respect to a light ray substantially having a light direction maximizing a brightness thereof.
References Cited (Backward Citations)
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