Lambertian servo sensor position and timing

Patent metadata

Field	Value
Publication number	US-9667928-B2
Application number	US-201514640485-A
Country	US
Kind code	B2
Filing date	Mar 6, 2015
Priority date	Mar 6, 2015
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

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.

First claim

What is claimed is:

1. 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.

2. The system of claim 1 , wherein the screen is hypothetically divided into multiple sections of equal area that each have a center point, and wherein the detector's face is angled to a center point on a section of the screen that is not the closest section to the detector spaced.

3. The system of claim 1 , wherein the first reflective region is a lambertian reflective region and where light reflected from the lambertian reflective region is detected by the detector.

4. The system of claim 1 , further comprising a second reflective region, wherein adjacent first reflective regions are spaced apart by the second reflective region that is different from the first reflective regions and wherein the second reflective region is specularly reflective.

5. 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 on when the light is illuminating the local raster scan region; and
wherein the detector is turned off when the light is illuminating a second local raster scan region.

6. The system of claim 5 , wherein the detector detects light reflected from a lambertian reflector in the vicinity of the first local raster scan region.

7. The system of claim 1 , wherein the plurality of detectors comprises an even number of detectors.

8. The system of claim 1 , further comprising one or more baffles coupled to each detector.

9. The system of claim 1 , 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.

10. 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, wherein at least one detector is angled between about 11 degrees and about 33 degrees from vertical.

11. The system of claim 10 , wherein the at least one detector is additionally angled between about 24 degrees and about 46 degrees from horizontal.

12. The system of claim 1 , wherein the plurality of detectors are disposed closer to the screen than the one or more focusing lens.

13. A system, comprising:
an enclosure, wherein the enclosure is bound by a screen and a plurality of walls, the screen including a filter layer having a plurality of reflective regions disposed thereon, the enclosure having detection area and a plurality of sub-enclosures, each sub-enclosure having an enclosure wall having an opening therethrough;
one or more light sources disposed within each sub-enclosure;
a raster scan device disposed within each sub-enclosure;
a focusing lens disposed within the opening

Assignees

• Prysm Inc

Inventors

• Trisnadi Jahja I
• Burroughs Alan C

Classifications

• H04N9/3194 Primary

  including sensor feedback · CPC title

• H04N9/317 Primary

  Convergence or focusing systems (electronic adjustment of convergence H04N9/3185; convergence or focusing arrangements for cathode ray tubes H04N9/28; means for automatic focusing of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/53) · CPC title

• H04N9/3147

  Multi-projection systems (video walls G06F3/1446) · CPC title

• H04N9/3129

  scanning a light beam on the display screen (scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161) · CPC title

• G09G2320/029

  by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel · CPC title