US 6,547,398 B2Granted

Projection-type image display apparatus and method

AssigneeSamsung Electronics Co., Ltd.

InventorsKun-ho Cho, Seung-tae Jung, Jang-hoon Yoo, Chul-woo Lee

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Abstract

A projection-type image display apparatus having a structure adapted so that the efficiency of the use of light and resolving power thereof can be enhanced. The projection-type image display apparatus includes a light source; a color separation unit separating incident rays according to predetermined wavelengths, and directing the separated rays at different angles; a lens array dividing the rays separated by the color separation unit into predetermined pixels; a driving portion driving the lens array to change the proceeding paths of the color rays; a polarizing beam splitter changing a proceeding path of incident rays depending on a direction of polarization; a reflection-type display device producing a color image using the rays entering via the polarizing beam splitter, and reflecting the color image toward the polarizing beam splitter; and a projection lens unit magnifying and projecting an incident image onto a screen. In addition, the projection-type image display apparatus may comprise. Alternative designs include a transmission-type display device in place of the reflection-type display device and a deflector changing the proceeding paths of the individual color rays separated by the color separation unit instead of the driving portion.

Claims17

Dependent claims

A projection-type image display apparatus including:

a light source emitting light rays;
a color separation unit separating the rays incident thereon according to predetermined ranges of wavelengths, and directing the separated incident rays at angles different from each other;
a lens array dividing the rays separated by the color separation unit into predetermined pixel rays and converging the pixel rays individually;
a driving portion driving the lens array to change the proceeding paths of the separated rays incident on the lens array from the color separation unit;
a polarizing beam splitter changing a proceeding path of the converged pixel rays depending on a direction of polarization by passing first polarized rays of the incident pixel rays from the lens array, and reflecting second polarized rays of the incident pixel rays from the lens array;
a reflection-type display device having pixels producing at least one color image using the first and/or second polarized rays having passed through and/or having been reflected from the polarizing beam splitter, and reflecting the color image toward the polarizing beam splitter;
a lens unit, provided in the optical path between the lens array and the display device, converging and projecting the first and second polarized rays onto the display device, said lens unit comprising:
a first converging lens provided in an optical path between the lens array and the polarizing beam splitter, converging the pixel rays having passed through the lens array;
and
a second converging lens provided in an optical path between the polarizing beam splitter and the display device converging incident pixel rays from the beam splitter;
and
a projection lens unit magnifying and projecting the color image formed by the display device and through the polarizing beam splitter onto a screen.

9 more elements

A projection-type image display apparatus including:

a light source emitting light rays;
a color separation unit separating rays of light incident thereon according to predetermined ranges of wavelengths, and directing the separated rays at angles different from each other;
a first polarizing beam splitter reflecting first polarized rays incident thereon from the rays separated by the color separation unit to direct the first polarized rays toward a first path, and passing second polarized rays incident thereon from the rays separated by the color separation unit to direct the second polarized rays toward a second path;
first and second lens arrays provided in the first and second path, respectively, dividing the rays incident thereon separated by the color separation unit into predetermined pixel rays and converging the pixel rays individually;
first and second driving portions driving the first and second lens arrays to change the proceeding paths of the rays incident to the first and second lens arrays;
first and second transmission-type display devices selectively passing the respective rays incident thereon having passed through the first and second lens arrays to form respective color images;
a second polarizing beam splitter combining the color images formed by the first and second display devices and directing the combined color image to one path;
and
a projection lens unit magnifying and projecting the color image combined by the second polarizing beam splitter onto a screen to form a magnified color image on the screen.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/860,820Filed 21 May 2001
Priority: KR 2000-3533126 Jun 2000
Published: US 2002/0012103 A131 Jan 2002
Granted: 15 Apr 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G03B 21/005
Projectors or projection-type viewers; Accessories therefor: projectors using an electronic spatial light modulator but not peculiar thereto
H04N 9/3117
For displaying the colours sequentially, e.g. by using sequentially activated light sources: by using a sequential colour filter producing two or…
H04N 13/324
Image reproducers: colour aspects
H04N 13/337
Displays for viewing with the aid of special glasses or head-mounted displays [HMD]: using polarisation multiplexing