Display assemblies for providing compressive forces at electronic display layers
View Patent ↗Display assemblies for preventing delamination of an optical stack are disclosed. A continuous, interconnected airflow pathway includes each of a first, second, and third airflow passageways, where the first airflow passageway is located, at least in part, forward of the optical stack, the second airflow passageway is located, at least in part, rearward of the optical stack, and the third airflow passageway is located, at least in part, rearward of the second airflow passageway. One or more fan units are positioned along the continuous, interconnected airflow pathway, and when activated, push gas through the continuous, interconnected airflow pathway, including into the first and second airflow passageways to generate compressive forces by the gas at the optical stack.
1. A display assembly for preventing delamination of an optical stack, said display assembly comprising:
a first airflow passageway located, at least in part, forward of the optical stack;
a second airflow passageway located, at least in part, rearward of the optical stack;
a third airflow passageway located, at least in part, rearward of the second airflow passageway;
a continuous, interconnected airflow pathway comprising each of the first, second, and third airflow passageways; and
one or more fan units positioned along the continuous, interconnected airflow pathway, which when activated, move gas through the continuous, interconnected airflow pathway, including pushing said gas into the first and second airflow passageways.
2. The display assembly of claim 1 wherein:
said one or more fan units, when activated, at least primarily pulls said gas through said third airflow passageway.
3. The display assembly of claim 1 wherein:
the one or more fan units, when activated, are configured to generate compressive forces by the gas at the optical stack.
4. The display assembly of claim 1 wherein:
at least one of the one or more fan units is positioned proximate to an entrance to each of the first and second airflow passageways.
5. The display assembly of claim 4 wherein:
the third airflow passageway extends between the entrance to each of the first and second airflow passageways and an exit of each of the first and second airflow passageways.
6. The display assembly of claim 5 wherein:
said one or more fan units, when activated, pushes said gas at a relatively high-pressure into the entrance to said first and second passageways and pulls said gas at a relatively low-pressure side from the exit of said third passageway.
7. The display assembly of claim 5 wherein:
at least a majority of the first, second, and third airflow passageways extend in longitudinal alignment with one another.
8. The display assembly of claim 7 wherein:
said one or more fan units, when activated, moves said gas through said first and second airflow passageways in a first, same primary direction and through said third airflow passageway in a second primary direction opposing the first direction.
9. The display assembly of claim 1 wherein:
the optical stack comprises a liquid crystal layer.
10. The display assembly of claim 9 wherein:
said optical stack comprises at least one of: a polarizer, and anti-reflective film, an optical enhancement film, a diffusive layer, and an optically transmissive layer.
11. The display assembly of claim 1 wherein:
an open airflow pathway for ambient air; and
a second set of one or more fan units, when activated, moves said ambient air through said open airflow pathway, wherein said continuous, interconnected airflow pathway forms a closed airflow pathway that is partitioned from an ambient environment.
12. The display assembly of claim 11 further comprising:
an illumination component, which when activated, provides illumination to the optical stack, wherein said open airflow pathway extends, at least in part, rearward of said illumination component.
13. The display assembly of claim 1 further comprising:
a cover provided forward of, and spaced apart from, said optical stack to define, at least in part, the first airflow passageway; and
a structural framework defining, at least in part, an enclosure for the optical stack, wherein the cover forms a forward portion of the enclosure.
14. The display assembly of claim 13 wherein:
said optical stack is part of an electronic display subassembly which is connected to the structural framework within the enclosure.
15. The display assembly of claim 1 further comprising:
a differential pressure sensor fluidly connected to, and configured to measure a pressure of, ambient air and said gas in at least a portion of the continuous, interconnected airflow pathway; and
a controller in electronic communication with said differential pressure sensor and said one or more fans unit, said controller comprising software instructions, which when executed, configure the controller to adjust operations of at least one of said one or more fan units in response to measurements from said differential pressure sensor to maintain a positive difference between the measured pressure of the gas in at least the portion of the continuous, interconnected airflow pathway and the measured pressure of the ambient air.
16. The display assembly of claim 1 further comprising:
a second optical stack facing an opposing direction from said optical stack;
a fourth airflow passageway located, at least in part, forward of the second optical stack; and
a fifth airflow passageway located, at least in part, rearward of the second optical stack and forward of the first, second, and third airflow passageways, wherein said continuous, interconnected airflow pathway comprises said fourth and fifth airflow passageways, and wherein the third airflow passageway is fluidly connected to the first, second, fourth, and fifth airflow passageways.
17. A method for preventing delamination of an optical stack, said method comprising:
activating one or more fan units of a display assembly, where said display assembly comprises:
a first airflow passageway located, at least in part, forward of the optical stack;
a second airflow passageway located, at least in part, rearward of the optical stack;
a third airflow passageway located, at least in part, rearward of the second airflow passageway; and
a continuous, interconnected airflow pathway comprising each of the first, second, and third airflow passageways;
wherein said one or more fan units are positioned along the continuous, interconnected airflow pathway;
wherein activating the one or more fan units moves gas through the continuous, interconnected airflow pathway, including pushing said gas into the first and second airflow passageways, thereby generating compressive forces by the gas at the optical stack.
18. The method of claim 17 wherein:
at least one of the one or more fan units is positioned proximate to an entrance to each of the first and second airflow passageways;
the third airflow passageway extends between the entrance to each of the first and second airflow passageways and an exit of each of the first and second airflow passageways; and
said one or more fan units, when activated, pushes said gas at a relatively high-pressure into the entrance to said first and second passageways and pulls said gas at a relatively low-pressure side from the exit of said third passageway.
19. A display assembly for preventing delamination of an optical stack, said display assembly comprising:
an electronic display subassembly comprising the optical stack and a backlight, wherein said optical stack comprises a liquid crystal layer, at least one polarizer, and at least one optical enhancement film;
a cover provided forward of, and spaced apart from, a forward surface of said electronic display subassembly;
a structural framework defining, at least in part, an enclosure for the optical stack, wherein the cover forms a forward portion of the enclosure and said electronic display subassembly is connected to said structural framework within the enclosure;
a first airflow passageway located, at least in part, between a rear surface of the cover and the forward surface of the electronic display subassembly;
a second airflow passageway located, at least in part, rearward of the optical stack;
a third airflow passageway located, at least in part, rearward of the second airflow passageway;
a continuous, interconnected airflow pathway extending within the enclosure and comprising each of the first, second, and third airflow passageways, wherein at least a majority of the first, second, and third airflow passageways extend in longitudinal alignment with one another; and
one or more fan units positioned along the continuous, interconnected airflow pathway, which when activated, move gas through the continuous, interconnected airflow pathway by at least primarily pushing said gas through said first and second airflow passageways in at least primarily a same, first direction, and at least primarily pulling said gas through said third airflow passageway in at least primarily a second direction opposing the first direction, thereby generating compressive forces by the gas at the optical stack.
20. The display assembly of claim 19 :
wherein:
the optical stack comprises a liquid crystal layer and one or more of: a polarizer, and anti-reflective film, an optical enhancement film, a diffusive layer, and an optically transmissive layer; and
said electronic display subassembly comprises a backlight for the optical stack; and
further comprising:
an open airflow pathway for ambient air which is located, at least in part, rearward of the backlight; and
a second set of one or more fan units, when activated, moves said ambient air through said open airflow pathway, wherein said continuous, interconnected airflow pathway forms a closed airflow pathway that is partitioned from an ambient environment.