Optical display system
View Patent ↗An optical display system includes a polarizer, an integrated back light unit optically connected to a first face of the polarizer and a display comprising an array of pixels optically connected to a second face of the polarizer. The first face of the polarizer and the second face of the polarizer are not parallel and the polarizer is configured to direct light from the integrated back light unit to the display.
1. An optical display system comprising:
a polarizer;
an integrated back light unit optically connected to a first face of the polarizer, wherein the integrated back light unit comprises at least one light emitting diode mounted on a support in a side-emitting configuration that provides illumination to a front side of the support, wherein the at least one light emitting diode is located on, and extends parallel to, a major surface of the support, and emits light parallel to the major surface of the support, and the integrated back light unit further comprises a waveguide that directs light from the at least one light emitting diode toward the front side of the support and to the first face of the polarizer; and
a display comprising an array of pixels optically connected to a second face of the polarizer,
wherein the first face of the polarizer and the second face of the polarizer are not parallel; and
wherein the polarizer is configured to direct light from the integrated back light unit to the display.
2. The system of claim 1 , wherein the integrated back light unit comprises an optical launch, and the waveguide is optically connected to the optical launch and the waveguide is located adjacent the polarizer.
3. The system of claim 1 , wherein the first face and the second face make an approximately 90° angle.
4. The system of claim 1 , wherein the integrated back light unit comprises a plurality of red, blue and green light emitting diodes.
5. The system of claim 1 , wherein the integrated back light unit provides uniform illumination across the array of pixels.
6. The system of claim 1 , wherein the illumination varies by less than 5% across the pixels and wherein the waveguide comprises particles of a wavelength converting material embedded within an optically transparent material.
7. The system of claim 1 , wherein the array of pixels comprises an array of liquid crystal or DLP mirror pixels.
8. The system of claim 1 , wherein the display comprises an image projection display.
9. The system of claim 8 , wherein the image projection display comprises a wearable display, a pico display or a head up display.
10. A method of making an optical display system comprising:
optically connecting integrated back light unit to a first face of a polarizer, wherein the integrated back light unit comprises at least one light emitting diode mounted on a support in a side-emitting configuration that provides illumination to a front side of the support, wherein the at least one light emitting diode is located on, and extends parallel to, a major surface of the support, and emits light parallel to the major surface of the support, and the integrated back light unit further comprises a waveguide that directs light from the at least one light emitting diode toward the front side of the support and to the first face of the polarizer; and
optically connecting display comprising an array of pixels to a second face of the polarizer,
wherein the first face of the polarizer and the second face of the polarizer are not parallel; and
wherein the polarizer is configured to direct light from the integrated back light unit to the display.
11. The method of claim 10 , wherein the first face and the second face make an approximately 90° angle.
12. The method of claim 10 , wherein the integrated back light unit provides red, blue and green light.
13. A method of projecting an image, comprising:
providing plural colors of light from an integrated back light unit to a first face of a polarizer, wherein the integrated back light unit comprises at least one light emitting diode mounted on a support in a side-emitting configuration that provides illumination to a front side of the support, wherein the at least one light emitting diode is located on, and extends parallel to, a major surface of the support, and emits light parallel to the major surface of the support, and the integrated back light unit further comprises a waveguide that directs light from the at least one light emitting diode toward the front side of the support and to the first face of the polarizer;
providing light from a second face of the polarizer to an array of pixels of a display that faces the second face of the polarizer; and
projecting an image generated by reflection of the light from the array of pixels through the polarizer.
14. The method of claim 13 , wherein the first face of the polarizer and the second face of the polarizer are not parallel.
15. The method of claim 14 , wherein the first face and the second face make an approximately 90° angle.
16. The method of claim 13 , wherein the image is projected from the array of pixels through the polarizer onto a surface or into a space between surfaces.
17. The method of claim 13 , wherein the integrated back light unit provides red, blue and green light from a plurality of red, blue and green emitting light emitting diodes.
18. The method of claim 13 , wherein the array of pixels comprises an array of liquid crystal or DLP mirror pixels.
19. The method of claim 13 , wherein the display comprises an image projection display.
20. The method of claim 19 , wherein the image projection display comprises a wearable display, a pico display or a head up display.
21. The method of claim 10 , wherein the waveguide comprises particles of a wavelength converting material embedded within an optically transparent material.
22. The method of claim 13 , wherein the waveguide comprises particles of a wavelength converting material embedded within an optically transparent material.
23. The system of claim 1 , wherein the waveguide comprises a light guiding plate which is located on the major surface of the support and extends parallel to the major surface of the support.
24. The method of claim 10 , wherein the waveguide comprises a light guiding plate which is located on the major surface of the support and extends parallel to the major surface of the support.
25. The method of claim 13 , wherein the waveguide comprises a light guiding plate which is located on the major surface of the support and extends parallel to the major surface of the support.