Lambertian servo sensor position and timing
The present disclosure generally relates to a LPD system having a plurality of detectors for detecting light reflected from the back surface of the screen. The detectors are positioned to detect light from one or more portions of the screen that are not directly in front of the detector.
1. A system, comprising:
a screen, the screen having a filter layer with a plurality of reflective regions thereon;
a light source;
a light directing system disposed between the light source and the screen and configured to direct light at the filter layer and scan the light across the filter layer; and
a plurality of detectors disposed in a region, wherein the screen has a plurality of hypothetical areas that are aligned with the regions, wherein the region is proximate to the screen, wherein each detector has a face that is disposed at an angle relative to the screen, wherein a center line of each detector is perpendicular to the face of the corresponding detector, wherein the center line of each detector intersects a center of a hypothetical area of the screen that is cattycorner the hypothetical area of where the detector is located.
2. The system of claim 1 , wherein a first reflective region of the plurality of reflective regions is a Lambertian reflective region and where light reflected from the Lambertian reflective region is detected by a detector of the plurality of detectors.
3. The system of claim 2 , wherein the plurality of detectors comprises an even number of detectors.
4. The system of claim 3 , further comprising one or more baffles coupled to each detector.
5. The system of claim 4 , wherein the light source comprises a plurality of light sources, wherein at least one light source is an excitation light source and at least one light source is a servo light source.
6. The system according to claim 5 , wherein the excitation light source is a laser.
7. The system according to claim 5 , wherein the excitation light source is an ultraviolet light.
8. The system of claim 1 , wherein the plurality of detectors comprises an even number of detectors.
9. The system of claim 8 , further comprising one or more baffles coupled to each detector.
10. The system of claim 9 , wherein the light source comprises a plurality of light sources, wherein at least one light source is an excitation light source and at least one light source is a servo light source.
11. The system according to claim 10 , wherein the excitation light source is a laser.
12. The system according to claim 10 , wherein the excitation light source is an ultraviolet light.
13. The system of claim 1 , further comprising one or more baffles coupled to each detector.
14. The system of claim 13 , wherein the light source comprises a plurality of light sources, wherein at least one light source is an excitation light source and at least one light source is a servo light source.
15. The system according to claim 1 , wherein the light source is a plurality of light engines.
16. A system, comprising:
a screen, the screen including:
a plurality of pixels, each pixel having a plurality of subpixels, wherein the subpixels are spaced apart by a distance such that a space is present between adjacent subpixels;
a filter layer, wherein the pixels and subpixels are disposed on a first side of the filter layer, and wherein the filter layer has a second side opposite the first side and wherein the second side is parallel to the first side; and
a plurality of first reflective regions, wherein the plurality of first reflective regions are disposed on the second side of the filter layer opposite the first side and wherein each first reflective region is aligned with a corresponding space between at least one pair of adjacent subpixels;
one or more light sources;
one or more raster scan devices;
one or more focusing lenses, wherein the one or more light sources, the one or more raster scanning devices and the one or more focusing lenses are arranged such that light emitted from the one or more light sources is directed at the one or more raster scanning devices and then directed through the one of more focusing lenses and then onto the screen; and
a plurality of detectors,
wherein each of the plurality of detectors is placed within a space between the second side of the filter layer and the one or more focusing lenses,
wherein each detector has a face and wherein the face of each detector is angled towards a portion of the screen,
wherein each detector's face is angled to a direction that is away from the detector's nearest point of the screen, the system further comprising a timing control module,
wherein the timing control module controls the timing of the on time/off time of the one or more light sources;
wherein at least one of the one or more light sources will reflect off the first and second reflective regions;
wherein the detector's face is angled to a screen position that is substantially a first local raster scan region center point of a light illuminated pixel position region;
wherein the detector is turned off when light is reflected from the screen in an area directly in front of the detector wherein the plurality of detectors comprises an even number of detectors.
17. The system of claim 16 , further comprising one or more baffles coupled to each detector.
18. The system of claim 17 , the one or more light sources comprises a plurality of light sources, wherein at least one light source is an excitation light source and at least one light source is a servo light source.
19. A system, comprising:
a screen, the screen including:
a plurality of pixels, each pixel having a plurality of subpixels, wherein the subpixels are spaced apart by a distance such that a space is present between adjacent subpixels;
a filter layer, wherein the pixels and subpixels are disposed on a first side of the filter layer, and wherein the filter layer has a second side opposite the first side and wherein the second side is parallel to the first side; and
a plurality of first reflective regions, wherein the plurality of first reflective regions are disposed on the second side of the filter layer opposite the first side and wherein each first reflective region is aligned with a corresponding space between at least one pair of adjacent subpixels;
one or more light sources;
one or more raster scan devices;
one or more focusing lenses, wherein the one or more light sources, the one or more raster scanning devices and the one or more focusing lenses are arranged such that light emitted from the one or more light sources is directed at the one or more raster scanning devices and then directed through the one of more focusing lenses and then onto the screen; and
a plurality of detectors,
wherein each of the plurality of detectors is placed within a space between the second side of the filter layer and the one or more focusing lenses,
wherein each detector has a face and wherein the face of each detector is angled towards a portion of the screen,
wherein each detector's face is angled to a direction that is away from the detector's nearest point of the screen, the system further comprising a timing control module,
wherein the timing control module controls the timing of the on time/off time of the one or more light sources;
wherein at least one of the one or more light sources will reflect off the first and second reflective regions;
wherein the detector's face is angled to a screen position that is substantially a first local raster scan region center point of a light illuminated pixel position region;
wherein the detector is turned off when light is reflected from the screen in an area directly in front of the detector and one or more baffles coupled to each detector.
20. The system of claim 19 , the one or more light sources comprises a plurality of light sources, wherein at least one light source is an excitation light source and at least one light source is a servo light source.