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AssigneeCanon Kabushiki Kaisha
InventorsTakashi Moriyama, Shinjiro Okada, Akira Tsuboyama, Takao Takiguchi, Seishi Miura, Jun Kamatani, Manabu Furugori
Estimating the term…
An organic electroluminescence device is constituted by a pair of substrates each provided with an electrode, and an organic luminescence layer of an organic luminescence material and a liquid crystal layer of a liquid crystal material, respectively disposed between the substrates. The liquid crystal material has an isotropic phase transition temperature lower than a glass transition temperature of the organic luminescence material. The liquid crystal layer has been formed by disposing the liquid crystal material on the organic luminescence layer in an isotropic phase state at a temperature lower than the glass transition temperature of the organic luminescence material and cooling the liquid crystal material to a temperature lower than the isotropic phase transition temperature.
A process for producing an organic electroluminescence device of the type comprising:
Dependencies are inferred from the claim text.
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OLEDs or polymer light-emitting diodes [PLED]: characterised by the electroluminescent [EL] layers
Organic electric solid-state devices
Term ended 31 May 2022 (estimated)
The present invention relates to an organic electroluminescence device used as a light-emitting device for flat panel displays, projection displays, printers, etc., and a process for producing the organic electroluminescence device.
In flat panel display, a liquid crystal device has been widely used. Particularly, a so-called active matrix-type liquid crystal device (e.g., TFT (thin film transistor)-type liquid crystal device) wherein each pixel is provided with a switching or active element such as TFT has been used predominantly in the field of flat panel display.
In such an active matrix-type liquid crystal device, however, a nematic liquid crystal is generally used as a liquid crystal material and is accompanied with a longer response time (slower response speed) to an applied electric field, e.g., on the order of several ten milliseconds, thus being unsuitable for high-speed image display such as motion picture display. Further, the liquid crystal device is accompanied with a large dependence of viewing angle since a birefringence state of liquid crystal changes depending on a viewing direction.
FIGS. 1 and 2 are respectively a schematic sectional view of an ordinary organic electroluminescence device.
FIG. 3 is a schematic sectional view of an embodiment of the organic electroluminescence device according to the present invention.
FIG. 4 is a schematic sectional view of an embodiment of an active matrix substrate for the organic electroluminescence device of the present invention.
The organic electroluminescence device according to the present invention basically has a structure shown in FIG. 3.
Referring to FIG. 3, an organic EL device includes a pair of substrates 1 and 2, a cathode 11 disposed on the substrate 1, an anode 14 disposed on the substrate 2, an organic (compound) layer 16 including at least a luminescence layer and disposed on the cathode 11, at least one liquid crystalline organic layer 17 disposed between the organic layer 16 and the anode 14 with a spacer 18.
One of the substrates 1 and 2 may be provided with a matrix of switching or active elements, such as TFTs (herein, referred to as “active matrix substrate or TFT substrate”).