Vacuum hold-down of seamless image panel to polycarbonate protective frontplane
The disclosure described herein generally relates to an image panel and a method of compressing the image panel. A breather assembly is coupled to at least one edge of the image panel and a vacuum is drawn through the breather assembly to pull the image panel portion and the front panel into intimate contact with phosphors sandwiched therebetween. The breather assembly draws the vacuum from the air pockets between adjacent phosphors to pull the image panel flat and thus prevent image artifacts from forming while also permitting the image panel portion and the front plane panel to move independently.
1. A method of compressing an image panel set together to reduce relative movement during thermal expansion of the image panel, wherein the image panel has one or more sealing gaskets coupled to two or more side edge regions thereof, and a breather assembly coupled to the image panel at a top side and a bottom side thereof, comprising:
drawing a vacuum through the breather assembly at the top side for a first period of time; and
drawing a vacuum through the breather assembly at the bottom side for a second period of time, wherein the second period of time occurs after the first period of time and wherein the two panels maintain a substantially uniformly spatial gap across the entire image panel following the second period of time.
2. The method of claim 1 , further comprising continuing to draw vacuum through the breather assembly at the top side during the second period of time.
3. The method of claim 1 , wherein the vacuum level after the second period of time is one of between 0.5-1 psi, 1-1.5 psi, 1.5-2 psi, 2-2.5 psi, 2.5-3 psi, 3-3.5 psi, 3.5-4 psi, 4-4.5, 4.5-5 psi, or 5-5.5 psi.
4. The method of claim 1 , wherein the breather assembly comprises a first breather subassembly, a second breather subassembly distinct from the first breather subassembly, wherein the first breather subassembly has a first rigidity and the second breather subassembly has a second rigidity and wherein the first rigidity is greater than the second rigidity, wherein the first breather subassembly has a first thickness and the second breather subassembly has a second thickness and wherein the first thickness is greater than the second thickness, wherein the second breather subassembly is disposed between two panels of the image panel and the first breather subassembly is disposed on one panel of the two panels and spaced from a second panel of the two panels, and wherein the first breather subassembly extends for the entire length of the top side of the first and second panels.
5. The method of claim 1 , wherein the image panel comprises a plurality of phosphor stripes disposed between two panels of the image panel.
6. The method of claim 5 , wherein the plurality of phosphor stripes are spaced from a first panel of the two panels, wherein the plurality of phosphor stripes are in contact with a second panel of the two panels, and wherein a plurality of air pockets are present between the second panel and the plurality of phosphor stripes.
7. The method of claim 1 , wherein the image panel comprises two panels each having a different coefficient of thermal expansion.
8. The method of claim 7 , wherein during the first period of time and the second period of time the two panels are pulled closer together, wherein during the first period of time the two panels are pulled together by a distance that is greater than a distance the two panels are pulled together in the second period of time, and wherein the second period of time is greater than the first period of time.
9. A vacuum enclosed image panel device, comprising:
a first panel having a top edge, a bottom edge, a first side edge and a second side edge;
a second panel having a top edge, a bottom edge, a first side edge and a second side edge; and
a first breather assembly coupled between the first panel and second panel, wherein the first panel and the second panel are substantially uniformly spaced apart under vacuum to reduce relative movement during thermal expansion wherein the first panel and the second panel have different coefficients of thermal expansion.
10. The device of claim 9 , wherein the first breather assembly comprises a first breather subassembly and a second breather subassembly distinct from the first breather subassembly.
11. The device of claim 10 , wherein the first breather subassembly has a first rigidity and the second breather subassembly has a second rigidity and wherein the first rigidity is greater than the second rigidity.
12. The device of claim 10 , wherein the first breather subassembly has a first thickness and the second breather subassembly has a second thickness and wherein the first thickness is greater than the second thickness.
13. The device of claim 10 , wherein the second breather subassembly is disposed between the two panels and the first breather subassembly is disposed on one panel and spaced from a second panel.
14. The device of claim 10 , wherein the first breather subassembly extends for the entire length of the top side of the first and second panels.
15. The device of claim 10 , further comprising one or more vacuum gauges coupled to the first breather subassembly.
16. The device of claim 9 , further comprising a plurality of phosphor stripes sandwiched between the first panel and the second panel, wherein the phosphor stripes extend from the top sides of the first and second panels to the bottom sides of the first panel and the second panel.
17. The device of claim 9 , further comprising:
one or more sealing gaskets coupled to the first side and the second side.
18. The device of claim 9 , wherein there is no clamping device clamping the first panel to the second panel.
19. The device of claim 9 , wherein the first panel is a touch panel and wherein an amount of pressure applied to the first panel to indicate a touching event is substantially uniform across the first panel.
20. A vacuum enclosed image panel device, comprising:
a first panel having a top edge, a bottom edge, a first side edge and a second side edge, wherein the first panel is a multilayer structure having:
an anti-glare coating;
a first polyethylene terephthalate layer disposed on the anti-glare coating;
a first pressure sensitive adhesive on the first polyethylene terephthalate layer;
a polycarbonate layer disposed on the pressure sensitive adhesive;
a second pressure sensitive adhesive on the polycarbonate layer;
a second polyethylene terephthalate layer disposed on the second pressure sensitive adhesive;
a second panel having a top edge, a bottom edge, a first side edge and a second side edge, wherein the second panel is disposed opposite the anti-glare coating of the first panel; and
a first breather assembly, wherein the first breather assembly includes:
a third pressure sensitive adhesive layer coupled to the second panel;
a fourth pressure sensitive adhesive layer coupled to the first panel; and
a gasket coupled to the third pressure sensitive adhesive layer and the fourth pressure sensitive adhesive layer, wherein the first panel and the second panel are substantially uniformly spaced apart under vacuum to reduce relative movement during thermal expansion.
21. The device of claim 20 , wherein the breather assembly comprises a first breather subassembly and a second breather subassembly distinct from the first breather subassembly.
22. The device of claim 21 , wherein the first breather subassembly has a first rigidity and the second breather subassembly has a second rigidity and wherein the first rigidity is greater than the second rigidity.
23. The device of claim 21 , wherein the first breather subassembly has a first thickness and the second breather subassembly has a second thickness and wherein the first thickness is greater than the second thickness.
24. The device of claim 21 , wherein the second breather subassembly is disposed between the two panels and the first breather subassembly is disposed on one panel and spaced from a second panel.
25. The device of claim 21 , wherein the first breather subassembly extends for the entire length of the top side of the first and second panels.
26. The device of claim 20 , further comprising one or more vacuum gauges coupled to the breather assembly.
27. The device of claim 20 , wherein the first panel and the second panel have different coefficients of thermal expansion.