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; and
a first attachment layer positioned between the fluorescent layer and the filter layer, wherein the first attachment layer attaches an excitation side surface of fluorescent layer to the filter layer while providing vertical separation between the fluorescent layer 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 to attach a viewer side surface of fluorescent layer to the sheet layer while providing vertical separation between the fluorescent layer and the sheet layer,
wherein adjacent fluorescent regions in the fluorescent layer are laterally separated by lateral-side air gaps that extend to lateral side surfaces of the fluorescent regions,
wherein the first attachment layer includes excitation-side air gaps that extend to the excitation side surfaces of the fluorescent regions,
wherein the second attachment layer includes viewer-side air gaps that extend to the viewer side surfaces of the fluorescent regions.
2. The display screen of claim 1 , wherein at least some lateral-side air gaps are fluidically connected to at least some excitation-side air gaps.
3. The display screen of claim 1 , wherein at least some lateral-side air gaps are fluidically connected to at least some viewer-side air gaps.
4. The display screen of claim 1 , wherein attachment regions are positioned to not overlap with center regions of the fluorescent regions.
5. The display screen of claim 1 , wherein the first attachment layer includes a plurality of portions separated by the excitation-side air gaps and that bridge spaces between adjacent fluorescent regions.
6. The display screen of claim 5 , the plurality of fluorescent regions comprise a plurality of parallel stripes.
7. The display screen of claim 6 , wherein the plurality of portions of the first attachment layer comprise a plurality of attachment stripes that contact the excitation side of the fluorescent stripes at their edge regions.
8. The display screen of claim 7 , wherein the plurality of attachment stripes extend parallel to the fluorescent stripes.
9. The display screen of claim 8 , wherein the attachment stripes span the length of the fluorescent stripes.
10. The display screen of claim 1 , wherein each of the plurality of fluorescent regions is supported by a plurality discrete portions of the first attachment layer.
11. The display screen of claim 10 , the plurality of fluorescent regions comprise a plurality of parallel stripes, and the discrete portions of the first attachment layer are separated along the length of the stripes by air gaps.
12. The display screen of claim 10 , the plurality of fluorescent regions comprise a plurality of parallel stripes, and the first attachment layer comprises a portion that extends transversely across a multiple stripes.
13. The display screen of claim 10 , wherein the attachment layer includes a plurality of attachment posts that are narrower in width than the lateral-side air gaps that separate the fluorescent regions.
14. The display screen of claim 1 , wherein the first attachment layer is a first adhesive and the second attachment layer is a second adhesive.
15. The display screen of claim 14 , wherein the first adhesive is formed from a UV-curable resin.
16. The display screen of claim 1 , wherein the second attachment layer has an anti-aliasing pattern configured to reduce moiré patterns in an image displayed on the display screen.
17. The display screen of claim 1 , wherein the second attachment layer includes a cross-hatch pattern.
18. The display screen of claim 1 , wherein the air gaps are filled with a substantially pure gas.
19. The display screen of claim 1 , wherein there is a vacuum in the air gaps.