Image system
Provided is an electronic image display and control system comprising in various embodiments a microdisplay video projector that projects a high quality color image from a non-CRT image source onto a diffused but transmissive optical projection screen that is optically coupled with and viewable through a biocular adapted to this purpose. Systems are disclosed that are adapted to be mechanically coupled with a user to prevent relative movement between the biocular and the user, for instance in tactical applications. Closed-loop control electronics are provided for automatically controlling the brightness and chromaticity of the image.
1. An electronic image display system comprising:
a microdisplay video projector that projects a color image from a non-CRT image source onto a diffused but transmissive optical projection screen that is optically coupled with and viewable through a biocular.
2. The electronic image display system of claim 1 , wherein the microdisplay video projector comprises:
a projector illumination source comprising:
a RGB LED lighting system;
circuitry that drives the RGB LED lighting system;
a condenser lens that processes light emanating from the RGB LED lighting system; and
a scattering screen that diffuses light provided by RGB LED lighting system.
3. The electronic image display system of claim 1 , wherein the microdisplay video projector comprises a projector illumination source and the following optical components that process light that has emanated from the projector illumination source:
a collection lens;
a pre-polarizer;
a polarizing beam splitter;
a quarter wave plate; and
a post-polarizer.
4. The electronic image display system of claim 1 , further comprising closed-loop control electronics that automatically control the brightness of the color image.
5. The electronic image display system of claim 1 , further comprising closed-loop control electronics that automatically control the chromaticity of the color image.
6. The electronic image display system of claim 1 , wherein the microdisplay video projector comprises:
an LCOS reflective microdisplay; and
electronic circuitry connected with and that drives the LCOS reflective microdisplay.
7. The electronic image display system of claim 1 , wherein the microdisplay video projector comprises:
a DMD reflective microdisplay; and
electronic circuitry connected with and that drives the DMD reflective microdisplay.
8. The electronic image display system of claim 1 , wherein the microdisplay video projector comprises:
an FLCOS reflective microdisplay; and
electronic circuitry connected with and that drives the FLCOS reflective microdisplay.
9. The electronic image display system of claim 1 , wherein the microdisplay video projector comprises a microdisplay comprising one or more transmissive light valves.
10. The electronic image display system of claim 1 , wherein the microdisplay video projector comprises an optical expansion and focusing cell that comprises a relay lens that projects an expanded and focused image on the diffused but transmissive optical projection screen.
11. The electronic image display system of claim 1 , wherein the diffused but transmissive optical projection screen is formed at least in part from PTFE.
12. The electronic image display system of claim 1 , wherein the diffused but transmissive optical projection screen is formed at least in part from acetal copolymer film.
13. The electronic image display system of claim 1 , wherein the diffused but transmissive optical projection screen is formed at least in part from polymer dispersed liquid crystal.
14. The electronic image display system of claim 1 , wherein the electronic image display system is adapted to mechanically couple the biocular with a user.
15. The electronic image display system of claim 14 , wherein the electronic image display system is adapted to mechanically couple the biocular with a user by comprising compliant material positioned between the biocular and the head of the user when viewing an image presented by the biocular.
16. An electronic image display system comprising:
a direct-view display that is optically coupled with and viewable through a biocular that is adapted to be mechanically coupled with a user, the biocular comprising an image input aperture having a predetermined location;
wherein the electronic image display system presents an appropriately sized and focused color image from the direct-view display to the predetermined location such that the user can view the image when the user is mechanically coupled with the biocular.
17. The electronic image display system of claim 16 wherein the electronic image display system presents the appropriately sized and focused color image from the direct-view display to a user without projecting the image on a diffused but transmissive optical projection screen.
18. An electronic image display system comprising:
microdisplay video projector means for projecting a color image onto a diffused but transmissive optical projection screen that is optically coupled with and viewable through biocular means.
19. The electronic image display system of claim 18 further comprising:
means for mechanically coupling a user with the biocular means.
20. The electronic image display system of claim 18 further comprising:
closed-loop control means for controlling the brightness or chromaticity of the color image.