Optics: image projectors – Polarizer or interference filter
Reexamination Certificate
2002-11-18
2004-04-27
Adams, Russell (Department: 2851)
Optics: image projectors
Polarizer or interference filter
C353S031000, C348S801000, C345S046000, C345S083000
Reexamination Certificate
active
06726329
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This continuation-in-part application is related to and claims the benefit of filing date of a Taiwan patent application which is entitled “Image Projection Device” and which was filed Dec. 21, 2001 as Application Ser. No. 90131751.
BACKGROUND
1. Field of the Invention
The invention relates to an image projection device and more particularly, to an image projection device with integrated photodiode light source.
2. Description of the Related Art
FIG. 1
is a schematic diagram of a typical image projector. As shown in
FIG. 1
, the typical projector includes a light source module
1
, an image module
2
and a projection module
3
, wherein module
1
further includes a plural-metal halogen lamp
1
a
, a lens array
1
b
an a PS (p-s polarized) converter
1
c.
As shown in
FIG. 1
, in the typical projector, module
1
can effectively convert an unpolarized light beam illuminated by the lamp
1
a
into a polarized light beam. However, the lamp's F/# limits the size of the light source module so that the entire size of the projector cannot be reduced. Additionally, the lamp in the typical projector consumes major power and generates heat that is a problem in development.
SUMMARY OF THE INVENTION
Accordingly, an object of the invention is to provide an image projection device with an integrated-photodiode light source that uses an integrated photodiode light source (having back-to-back symmetric configuration of photodiodes) as the device's light source. Additionally, a light control circuit is used to control light beam from the light source illuminating a reflector and then reflecting to a reflective display panel in order to reflect the light beam and generate an image. Thus, a projection module can project the image on a viewing plate. The display panel is preferably a liquid-crystal-on-silicon (LCOS) display.
The invention provides an image projection device with an integrated-photodiode light source, and includes a light source module, a polarizing beam splitter, a reflective display panel and a projection module, wherein the light source module uses a plurality of photodiodes as light sources and the display panel is preferably an LCOS display.
A characteristic of the invention is that the light source module includes at least one illuminating unit with a light source of random RGB photodiode arrangement on a circuit board.
Another characteristic of the invention is that the light source module includes a plurality of illuminating units, a polarizing beam splitter, a reflector and a wave-retardation (half-wave) plate.
Another characteristic of the invention is that the light source module includes a plurality of illuminating units, at least one prism and a polarizer, wherein each illuminating unit illuminates an unpolarized light beam and all unpolarized light beams are combined by the prism into a single unpolarized light beam.
Another characteristic of the invention is that the light source module includes a plurality of illuminating units and a photoguider, wherein the photoguider is formed of four reflection mirrors.
A further characteristic of the invention is that a light control circuit is used to control the light source module for the photodiode's illumination, thereby controlling projection quality.
A still further characteristic of the invention is that the photodiodes are symmetrically implemented on both sides of the circuit board 22 mm long, 8.5 mm wide and 0.8 mm thick. Additionally, the light source array is 11.461 mm long, 8.5 mm wide and 1.2 mm thick. In current technologies, each side of the polarizing beam splitters can be less than 13 mm, the LCOS display panel can be 12.5 mm, and the projection module can have a width of 15 mm and a length of 25 mm. As such, the invention can achieve the space requirements for the projection device.
An advantage of the invention is reduced volume and weight of the projection device.
Another advantage of the invention is reduced power consumption and heat generation for the projection device.
REFERENCES:
patent: 6183091 (2001-02-01), Johnson et al.
patent: 6407766 (2002-06-01), Ramanujan et al.
patent: 6614462 (2003-09-01), Donner et al.
patent: 6626540 (2003-09-01), Ouchi et al.
patent: 6646716 (2003-11-01), Ramanujan et al.
Cheng Hung Lung
Li Hsiao Yi
Liu He Chiang
Dalakis Michael
Delta Electronics , Inc.
Thomas Kayden Horstemeyer & Risley
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