Electric lamp and discharge devices – With luminescent solid or liquid material
Reexamination Certificate
1999-01-27
2001-07-24
Patel, Nimeshkumar D. (Department: 2879)
Electric lamp and discharge devices
With luminescent solid or liquid material
C313S011000, C313S012000, C313S045000
Reexamination Certificate
active
06265820
ABSTRACT:
FIELD OF THE INVENTION
The embodiment of the present invention relates to organic light emitting display devices. In particular, the present invention relates to a system and method for removing heat from the organic light emitting display device.
BACKGROUND OF THE INVENTION
Organic light emitting diodes can potentially generate efficient high brightness displays. However, heat generated during the operation of the display in the high brightness mode can limit the lifetime of the display. It is generally believed that the heat that is generated decreases the quantum efficiency and disintegrates the organic layers leading to the formation of shorts from the cathode layer to the anode layer. The display catastrophically fails at this point. This is especially true for large continuous emitting areas since the heat dissipation is not very efficient.
OBJECT OF THE INVENTION
It is an object of the present invention to provide a device for removing heat from an organic light emitting display device.
It is another object of the present invention to provide a device for removing heat from an organic light emitting display device to allow high brightness.
It is another object of the present invention to provide a device for removing heat from an organic light emitting display device to obtain long life expectancy.
It is another object of the present invention to provide a device for removing heat from the organic layers and conductor layers of the organic light emitting display device.
It is another object of the present invention to provide a method of removing heat from an organic light emitting display device.
It is another object of the present invention to provide a method of removing heat from the organic layers and conductor layers of the organic light emitting display device.
It is another object of the present invention to provide an assembly for transferring heat from the organic light emitting display device to a cooling assembly.
It is another object of the present invention to provide an assembly for dissipating heat away from the organic light emitting display device.
It is another object of the present invention to use a thermal conducting material to transfer heat from the organic light emitting display device.
It is another object of the present invention to use a hydrophobic thermal paste to transfer heat from the organic light emitting display device and to absorb moisture.
SUMMARY OF THE INVENTION
An organic light emitting display device is disclosed. The organic light emitting display device may be either a downwardly light emitting display or an upwardly light emitting display. The organic light emitting device has at least one organic layer and a cathode layer. The improvement in the organic light emitting device includes a heat removal assembly for removing heat from the organic light emitting display device. The heat removal assembly removes heat from one of the at least one organic layer and the cathode layer.
The heat removal assembly may include a heat dissipating assembly for dissipating heat from the organic light emitting device and a heat transfer assembly for transferring heat from one of the at least one organic layer and the cathode layer to the heat dissipating assembly. The incorporation of a heat removal system may significantly improve the performance and brightness of the display.
The heat dissipating assembly may include a heat sink.
The heat transfer assembly may include at least one thermally conducting layer.
The heat removal assembly may further include a cooling assembly for cooling the organic light emitting display device. The cooling assembly may include one of a thermoelectric cooler and a recirculating assembly for recirculating a cooling material. When a recirculating assembly is used, the cooling material may be selected from the group consisting of a cooling liquid and a cooling gas. The cooling assembly may also include an air removal system for removing heat.
The cooling assembly may be positioned between the heat dissipating assembly and the heat transfer assembly.
An organic light emitting display device is disclosed. The device may include a substrate, a first conductor layer located on the substrate, at least one organic layer located on the substrate, a second conductor layer, and heat removal assembly for removing heat from the organic light emitting display device.
The heat removal assembly may include a heat dissipating assembly for dissipating heat from the organic light emitting device, and heat transfer assembly for transferring heat from the organic light emitting device to the heat dissipating assembly. The heat removal assembly may further include a cooling assembly for cooling the organic light emitting display device.
The device may further include a plate positioned between the second conductor layer and the heat removal assembly. The device may further include a heat transferring assembly located between the second conductor layer and the plate for transferring heat from the organic light emitting device to the plate. The heat transferring assembly may include at least one thermally conducting layer.
The organic light emitting display device that includes the above-described heat removal assembly has an increased life expectancy at high brightness.
A method of cooling an organic light emitting display device is also disclosed. The method includes the steps of transferring heat generated by the organic light emitting device to a cooling assembly, and dissipating the heat transferred to the cooling assembly.
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Ghosh Amalkumar P.
Johnstone Walter V.
Prache Olivier F.
Zimmerman Steven M.
Collier Shannon Scott PLLC
eMagin Corporation
Hopper Todd Reed
Patel Nimeshkumar D.
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