Multilayered screens for scanning beam display systems
A display screen includes a filter layer, a fluorescent layer having parallel fluorescent stripes, and an attachment layer between an excitation side of the fluorescent layer and a first side of the filter layer to attach the excitation side of fluorescent layer to the filter layer while providing vertical separation therebetween. The attachment layer includes attachment regions that are separated from each other by lateral spacings such that excitation-side air gaps are formed between areas of the fluorescent layer and the filter layer that correspond to the lateral spacings. During display operation, excitation light received on a second side of the filter layer propagates through to the first side of the filter layer, and at least a portion of the excitation light that propagates from the second side of the filter layer travels through the excitation-side air gaps to excite the fluorescent stripes.
1. A display screen comprising:
a filter layer;
a fluorescent layer including a plurality of fluorescent regions laterally separated by lateral-side air gaps; and
a first attachment layer positioned between the fluorescent layer and the filter layer, wherein the first attachment layer includes a plurality of first attachment sections that are laterally separated by excitation-side air gaps and that attach an excitation side surface of the plurality of fluorescent regions to the filter layer while providing vertical separation between the plurality of fluorescent regions and the filter layer,
a sheet layer positioned on a side of the fluorescent layer farther from the filter layer; and
a second attachment layer positioned between the fluorescent layer and the sheet layer, wherein the second attachment layer includes a plurality of second attachment sections that are laterally separated by viewer-side air gaps and that attach a viewer side surface of the plurality of fluorescent regions to the sheet layer while providing vertical separation between the fluorescent layer and the sheet layer,
wherein the plurality of first attachment sections and the plurality of second attachment sections are configured such that for each portion of a plurality of portions of the plurality of fluorescent regions an air gap extends in a vertical cross-section entirely around the portion.
2. The display screen of claim 1 , wherein the plurality of fluorescent regions comprise a plurality of elongated regions, and the vertical cross-section is perpendicular to a longitudinal axis of the elongated region.
3. The display screen of claim 2 , wherein the plurality of fluorescent regions comprise a plurality of parallel stripes, and the vertical cross-section is perpendicular to a longitudinal axis of the parallel stripes.
4. The display screen of claim 2 , wherein, for a particular elongated region, patches are positioned at different positions along the longitudinal axis.
5. The display screen of claim 4 , wherein adjacent patches along the longitudinal axis of the elongated region support different areas along an axis perpendicular to the longitudinal axis.
6. The display screen of claim 4 , wherein the plurality of first attachment sections comprise a plurality of patches with at least some patches supporting a plurality of fluorescent regions.
7. The display screen of claim 4 , wherein the plurality of first attachment sections comprise a plurality of patches with at least some patches supporting a single fluorescent region.
8. The display screen of claim 1 , wherein the plurality of first attachment sections comprise a plurality of patches with at least some patches supporting multiple fluorescent regions.
9. The display screen of claim 8 , wherein the plurality of first attachment sections support edge portions of the fluorescent regions such that excitation-side air gaps span center sections of the fluorescent regions.
10. The display screen of claim 1 , wherein the plurality of first attachment sections support edge portions of the fluorescent regions such that excitation-side air gaps span center sections of the fluorescent regions.
11. The display screen of claim 1 , wherein the first attachment sections are randomly distributed.
12. The display screen of claim 1 , wherein the plurality of first attachment sections are formed from a UV-curable resin.
13. The display screen of claim 1 , wherein the air gaps are filled with a substantially pure gas.
14. The display screen of claim 1 , wherein there is a vacuum in the air gaps.
15. The display screen of claim 1 , wherein the excitation-side air gaps extend to the excitation side surface of the plurality of fluorescent regions, and the viewer-side air gaps extend to the viewer side surface of the plurality of fluorescent regions.
16. A display screen comprising:
a filter layer;
a fluorescent layer including a plurality of fluorescent regions laterally separated by lateral-side air gaps; and
a first attachment layer that attaches an excitation side surface of the plurality of fluorescent regions to the filter layer;
a sheet layer positioned on a side of the fluorescent layer farther from the filter layer; and
a second attachment layer positioned between the fluorescent layer and the sheet layer, wherein the second attachment layer includes a plurality of attachment sections that are laterally separated by viewer-side air gaps and that attach a viewer side surface of plurality of fluorescent layer to the sheet layer while providing vertical separation between the fluorescent layer and the sheet layer, wherein the plurality of attachment sections are arranged in an anti-aliasing pattern configured to reduce moiré patterns in an image displayed on the display screen.
17. The display screen of claim 16 , wherein the anti-aliasing pattern includes a cross-hatch pattern.
18. The display screen of claim 16 , wherein the anti-aliasing pattern includes a sinusoidal pattern.
19. The display screen of claim 16 , wherein the plurality of attachment sections are composed of an adhesive.
20. The display screen of claim 16 , wherein the first attachment layer includes a plurality of first attachment sections that are laterally separated by excitation-side air gaps and that attach an excitation side surface of the plurality of fluorescent regions to the filter layer while providing vertical separation between the plurality of fluorescent regions and the filter layer.