Combination overhead projector and electronic display device
AssigneeTexas Instruments Incorporated
InventorsLars A. Yoder, Frank J. Moizio, Michael T. Davis
Life of this patent
Estimating the term…
Abstract
A projection display that combines both overhead projector and electronic display functionality in a single projector. This invention provides a single comprehensive solution, which addresses both overhead projection display needs, as well as electronic projection display needs and further provides a new function that allows superimposed images from the two functions to be captured and stored for future projection through the electronic display function.
Claims38
A combination overhead projector and electronic display device, comprising:
- a white light source coupling light to the optics of said electronic display;
- light from said electronic display optics reflected off a first turning mirror in the optics path of said overhead projector, through a backlighted Fresnel lens located just below a transparency media surface in said overhead projector;
- light from said Fresnel lens directed to a condenser lens on to the surface of a second turning mirror located in the remote head of said overhead projector;
- and
- light reflected from said second turning mirror directed through a projection lens on to a display screen.
A combination overhead projector and electronic display, comprising:
- a white light source providing light to said projector, said light capable of being switched between a first and second light path by a switchable mirror;
- said switchable mirror being placed in a first position as a turning mirror to reflect light along said first light path;
- a first projection lens in said first light path coupling said light through a Fresnel lens located just below said overhead projection transparency surface, through a condensing lens located in said overhead projector's remote head, on to the surface of a second smaller turning mirror, through a second projection lens in said projection head, on to a display screen to produce a first image on said display screen;
- and
- said switchable mirror being placed in a second position to allow said light to be directed along said second light path into said electronic display optics, on to the surface of a spatial light modulator where it is modulated and passed through a second projection lens, on to said display screen to produce a second image on said display screen.
A combination overhead projector and electronic display, comprising:
- a white light source providing light to said projector, said light capable of being switched between a first and second light path by a switchable fiber optics bundle;
- said switchable fiber bundle being placed in a first position to reflect light along said first light path;
- a first projection lens in said first light path coupling said light through a Fresnel lens located just below the overhead projection transparency surface, through a condensing lens located in said overhead projector's remote head on to the surface of a second smaller turning mirror, through a second projection lens in said projection head, on to a display screen to produce a first image on said display screen;
- and
- said switchable fiber bundle being placed in a second position to allow said light to be directed along said second light path into said electronic display optics on to the surface of a spatial light modulator where it is modulated and passed through a second projection lens and on to said display screen.
Dependencies are inferred from the claim text.