Subassemblies comprising a compressible pressure pad, methods for reducing ripple effect in a display device, and methods for improving impact absorption in a display device
View Patent ↗A subassembly for a display device includes a display component having an outer display surface and an opposite inner surface; a compressible pressure pad including a plurality of nonwoven fibers having an average diameter of 100 micrometers or less, disposed on the inner surface of the display component; and an internal component disposed on a side of the compressible pressure pad on a side opposite the display component. Methods for reducing ripple effect and improving impact absorption in a display device are also described.
1. A subassembly for a display device, comprising
a display component comprising an outer display surface and an opposite inner surface;
a compressible pressure pad comprising a plurality of nonwoven fibers having an average diameter of 100 micrometers or less, disposed on the inner surface of the display component; and
an internal component disposed on the compressible pressure pad on a side opposite the display component, wherein the plurality of nonwoven fibers comprises a thermoplastic polymer comprising a thermoplastic elastomer; a polyolefin; or a combination comprising at least one of the foregoing;
wherein the thermoplastic polymer has one or more of
a tensile elongation at break of greater than 100%, measured according to ASTM D638;
a resiliency of greater than 50%, measured according to ASTM D4964; or
a melt flow index effective to allow melt blowing of the thermoplastic polymer; and
wherein the compressible pressure pad disposed on a 1 millimeters thick glass surface exhibits at least one of:
an impact force reduction of at least 60% compared to the glass surface not including the compressible pressure pad, determined by dropping a 10 gram steel ball from a height of 10 centimeters;
an impact force reduction of at least 20% compared to the glass surface not including the compressible pressure pad, determined by dropping a 30.6 gram steel ball from a height of 20 centimeters; and
an impact force reduction of at least 30% compared to the glass surface not including the compressible pressure pad, determined by dropping a 55 gram steel ball from a height of 20 centimeters.
2. The subassembly of claim 1 , wherein the plurality of nonwoven fibers further comprise a crosslinking agent, and wherein at least a portion of the plurality of fibers are crosslinked at a point of contact between the fibers.
3. The subassembly of claim 1 , wherein the compressible pressure pad has a thickness of
10 micrometers to 10 millimeters; or
250 micrometers or less.
4. The subassembly of claim 1 , wherein the plurality of fibers have an average diameter of
0. 5 nanometers to less than 100 micrometers;
0. 5 nm to 10 micrometers; or
250 nanometers to 5 micrometers.
5. The subassembly of claim 1 , wherein the compressible pressure pad has an average distance between fibers of 0.05 nanometers to 50 millimeters.
6. The subassembly of claim 1 , wherein the compressible pressure pad has a weight of 1 to 100 grams per square meter.
7. The subassembly of claim 1 , wherein the compressible pressure pad excludes a foam.
8. The subassembly of claim 1 , further comprising a screen disposed on the outer surface of the display component, and optionally, an adhesive layer disposed between the screen and the display component.
9. The subassembly of claim 1 , further comprising an adhesive layer disposed on one or both sides of the compressible pressure pad.
10. The subassembly of claim 9 , wherein the adhesive layer comprises an optically clear adhesive.
11. The subassembly of claim 1 , wherein the display component is a liquid crystal display component or a light emitting diode display component.
12. The subassembly of claim 1 , wherein the subassembly is a subassembly for a mobile electronic display device comprising
a liquid crystal display component or a light emitting diode display component having an outer display surface and an opposite inner surface,
a screen disposed on the outer display surface of the display component;
a compressible pressure pad disposed adjacent the inner surface of the display component, wherein the compressible pressure pad comprises a plurality of nonwoven, thermoplastic fibers having an average diameter of 100 micrometers or less, a thickness of 50 micrometers to 1 millimeter, has a weight of 5 to 30 grams per square meter, and is devoid of a foam; and
an internal component disposed on the compressible pressure pad on a side opposite the display component.
13. A display device comprising the subassembly of claim 1 , wherein the display device is a mobile electronic device.
14. A method for reducing ripple effect or improving impact absorption in a display device comprising a display component disposed on an internal component, the method comprising,
incorporating a compressible pressure pad comprising a plurality of nonwoven fibers having an average diameter of 100 micrometers or less between the display component and the internal component, wherein
the plurality of nonwoven polymer fibers comprise a thermoplastic polymer comprising a thermoplastic elastomer; a polyolefin; or a combination comprising at least one of the foregoing, wherein the thermoplastic polymer has one or more of:
a tensile elongation of greater than 100%, measured according to ASTM D638;
a resiliency of greater than 50, measured according to ASTM D4964; and
a melt flow index effective to allow melt blowing of the thermoplastic polymer; and
wherein the compressible pressure pad disposed on a 1 millimeter thick glass surface exhibits at least one of:
an impact force reduction of at least 60% compared to the glass surface not including the nonwoven material, determined by dropping a 10 gram steel ball from a height of 10 centimeters;
an impact force reduction of at least 20% compared to the glass surface not including the nonwoven material, determined by dropping a 30.6 gram steel ball from a height of 20 centimeters; and
an impact force reduction of at least 30% compared to the glass surface not including the nonwoven material, determined by dropping a 55 gram steel ball from a height of 20 centimeters.
15. A nonwoven material comprising a plurality of nonwoven polymer fibers having an average diameter of 100 micrometers or less, and a thickness 250 micrometers or less, wherein
the plurality of nonwoven polymer fibers comprise a thermoplastic elastomer having
a tensile elongation of greater than 100%, measured according to ASTM D638;
a resiliency of greater than 50%, measured according to ASTM D4964; and
a melt flow index of greater than 5 grams per 10 minutes, measured according to ASTM D1238 or ISO 1133 ; and
wherein the nonwoven material disposed on a 1 millimeter thick glass surface exhibits at least one of:
an impact force reduction of at least 60% compared to the glass surface not including the nonwoven material, determined by dropping a 10 gram steel ball from a height of 10 centimeters;
an impact force reduction of at least 20% compared to the glass surface not including the nonwoven material, determined by dropping a 30.6 gram steel ball from a height of 20 centimeters; and
an impact force reduction of at least 30% compared to the glass surface not including the nonwoven material, determined by dropping a 55 gram steel ball from a height of 20 centimeters.
16. The nonwoven material of claim 15 , wherein the plurality of nonwoven polymer fibers comprise single row or multi-row meltblown polymer fibers.
17. The nonwoven material of claim 15 , wherein the plurality of nonwoven fibers are multi-row meltblown polymer fibers, and the nonwoven material exhibits at least one of:
an impact force reduction of at least 70% compared to the glass surface not including the nonwoven material, determined by dropping a 10 gram steel ball from a height of 10 centimeters; and
an impact force reduction of at least 30% compared to the glass surface not including the nonwoven material, determined by dropping a 30.6 gram steel ball from a height of 20 centimeters.