Optical component calibration system for laser-based display device
View Patent ↗A laser-based display device includes a plurality of ultraviolet lasers configured to excite a phosphor-containing display screen in order to produce visible light. The laser-based display device also includes a reference laser used for calibration operations. A control system within the laser-based display device causes the reference laser beam to scan across one or more calibration features, and adjusts optical components of the laser-based display device, including activation timing of the ultraviolet lasers, based on feedback patterns generated by the calibration features, to compensate for drift effects. The calibration features may be disposed off-screen or on-screen.
1. A laser-based display device, comprising:
a display screen; and
a component housing including therein:
laser beam sources for producing laser beams including at least one calibration laser beam;
a rotating polygon having a plurality of mirrored facets, each mirrored facet causing the laser beams to be scanned across the display screen; and
an off-screen calibration module that is physically separate from the display screen, having passive calibration features that are positioned in optical paths of the laser beams reflected by the mirrored facets, wherein the passive calibration features are transmissive and the off-screen calibration module includes an elliptical reflector that receives light transmitted through the passive calibration features and directs the transmitted light to a single detector.
2. The device of claim 1 , wherein the off-screen calibration module further includes a directing lens between the elliptical reflector and the single detector.
3. The device of claim 2 , wherein the directing lens is a Fresnel lens.
4. The device of claim 3 , wherein the off-screen calibration module further includes a diffuser between the Fresnel lens and the single detector.
5. The device of claim 2 , wherein the directing lens is a cylindrical lens.
6. The device of claim 2 , wherein the off-screen calibration module further includes a diffuser disposed between the directing lens and the detector, the diffuser adapted to diffuse the light transmitted between the directing lens and the detector.
7. A laser-based display device, comprising:
a display screen; and
a component housing including therein:
laser beam sources for producing laser beams including at least one calibration laser beam;
a rotating polygon having a plurality of mirrored facets, each mirrored facet causing the laser beams to be scanned across the display screen through a sweep angle; and
an off-screen calibration module that is physically separate from the display screen, having passive calibration features that are positioned in an optical path of the at least one calibration laser beam reflected by at least one mirrored facet of the plurality of mirrored facets, wherein the optical path of the at least one calibration laser beam reflected by the at least one mirrored facet traverses beyond the sweep angle to the off-screen calibration module, and wherein the off-screen calibration module includes a reflector that receives light from the at least one calibration laser beam transmitted through the passive calibration features and directs the transmitted light to a single detector.
8. The device of claim 7 , wherein the reflector is cylindrical.
9. The device of claim 8 , wherein the off-screen calibration module further includes a directing lens between the reflector and the single detector.
10. The device of claim 9 , wherein the directing lens is a cylindrical lens.
11. The device of claim 9 , wherein the directing lens is a Fresnel lens.
12. The device of claim 9 , wherein the off-screen calibration module further includes a diffuser disposed between the directing lens and the detector, the diffuser adapted to diffuse the light transmitted between the directing lens and the detector.
13. The device of claim 8 , wherein the passive calibration features are transmissive.
14. The device of claim 8 , wherein the passive calibration features are reflective.
15. The device of claim 7 , wherein the passive calibration features are reflective and the reflector is elliptical.
16. The device of claim 7 , wherein the scanned laser beams form an image on the display screen, the image extending to the edges of the display screen.
17. The device of claim 7 , wherein the off-screen calibration module is positioned behind the display screen.
18. A laser-based display device, comprising:
a display screen; and
a component housing including therein:
laser beam sources for producing laser beams including at least one calibration laser beam;
a rotating polygon having a plurality of mirrored facets, each mirrored facet causing the laser beams to be scanned across the display screen through a sweep angle; and
an off-screen calibration module that is physically separate from the display screen, having passive calibration features that are positioned in an optical path of the at least one calibration laser beam reflected by at least one mirrored facet of the plurality of mirrored facets, wherein the optical path of the at least one calibration laser beam reflected by the at least one mirrored facet traverses beyond the sweep angle, and wherein the off-screen calibration module includes a lens adapted to direct light from the at least one calibration laser beam transmitted through the passive calibration features to a single detector.
19. The device of claim 18 , wherein the lens is a cylindrical lens.
20. The device of claim 18 , wherein the lens is a Fresnel lens.
21. The device of claim 18 , wherein the passive calibration features are transmissive.
22. The device of claim 18 , wherein the passive calibration features are reflective.
23. The device of claim 18 , wherein the off-screen calibration module further includes a reflector that receives light transmitted through the passive calibration features and directs the transmitted light to the lens.
24. The device of claim 23 , wherein the reflector is cylindrical.
25. The device of claim 23 , wherein the reflector is elliptical.
26. The device of claim 18 , wherein the off-screen calibration module further includes a diffuser disposed between the lens and the detector, the diffuser adapted to diffuse the light transmitted between the lens and the detector.
27. The device of claim 18 , wherein the scanned laser beams form an image on the display screen, the image extending to the edges of the display screen.
28. The device of claim 18 , wherein the off-screen calibration module is positioned behind the display screen.