EP0372568A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Projector
Assignee: Philips Components Kobe KK
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Filing: 1989-12-08
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Granted: —
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Expires: 2009-12-08
Abstract
Abstract In a projection device according to the present invention, light from a point light source unit (30) is reflected by a first reflecting mirror (21) to produce parallel rays, which are applied to a color active matrix liquid crystal display unit (22). The parallel rays having passed through the liquid crystal display unit (22) are converted by a second reflecting mirror (23) into a bundle of rays of a desired solid angle for projection onto a screen (13).
Inventors
- 👤 Shigeo Aoki
- 👤 Yasuhiro Ukai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 22:45
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/72; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3105; H04N9/3108; G; G03; G03B; G03B21/00; G03B21/14; G03B21/28; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/30; G09B9/32; G09B9/326; G09F; G09F19/00; G09F19/12; G09F19/18; H04N5/74; H04N9/3141
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A projection device comprising: a point light source means by which light containing desired wavelength components is emitted as light from a point light source which can be regarded as substantially a point; a reflecting collimator means which receives said light from said point light source means and reflects it as parallel rays; a color active matrix liquid crystal display means disposed in the optical path of said parallel rays from said reflecting collimator means and capable of displaying a desired color image with image signals; and a reflecting projection means which reflects and converts said parallel rays having passed through said color active matrix liquid crystal display means to a bundle of rays of a desired solid angle and projecting said bundle of rays onto a screen.
Claim 2
Dependent Claim
128 words
A projection device comprising: a point light source means by which light containing desired wavelength components is emitted as light from a point light source which can be regarded as substantially a point; a reflecting collimator means which receives said light from said point light source means and reflects it as parallel rays; a color active matrix liquid crystal display means disposed in the optical path of said parallel rays from said reflecting collimator means and capable of displaying a desired color image with image signals; and a reflecting projection means which reflects and converts said parallel rays having passed through said color active matrix liquid crystal display means to a bundle of rays of a desired solid angle and projecting said bundle of rays onto a screen.
Claim 3
Dependent Claim
75 words
The projection device of claim 1 wherein reflecting projection means includes a first reflecting mirror for reflecting, as a bundle of rays of a desired first solid angle, said parallel rays having passed through said color active matrix liquid crystal display means and a second reflecting mirror for reflecting said bundle of rays reflected by said first reflecting mirror as a bundle of rays of a desired second solid angle for projection onto said screen.
Claim 4
Dependent Claim
36 words
The projection device of claim 1 or 2 wherein said color active matrix liquid crystal display means includes color filters formed by an optical interference filter which permits the passage therethrough of said desired wavelength components.
Claim 5
Dependent Claim
27 words
The projection device of claim 1 or 2 wherein said point light source means includes a laser beam source which emits light containing said desired wavelength components.
References Cited (Backward Citations)
No citation records indexed.
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