ORGANIC ELECTROLUMINESCENCE DISPLAY APPARATUS

• US 20110095279A1
• Filed: 07/10/2009
• Published: 04/28/2011
• Est. Priority Date: 07/11/2008
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Sato, Nobuhiko, Nagayama, Kohei, Mizuno, Nobutaka
• Granted Patent: US 8,519,383 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: H05B 33/22 characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
• CPC Class Codes: H05B 33/26 characterised by the composition or arrangement of the conductive material used as an electrode
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/30 Devices specially adapted for multicolour light emission
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair

Abstract

Provided is an organic electroluminescence display apparatus capable of reducing a chromaticity difference caused by light emission from an organic layer including an emission layer having the same color, which is continuously formed over two sub-pixels included in a pixel. The organic electroluminescence display apparatus includes: a substrate; and multiple organic electroluminescence devices which are stacked on the substrate, each of which includes electrodes and an organic layer sandwiched by the electrodes in which first organic layer and a second organic layer are arranged side by side in an emission region corresponding to a pixel formed on the substrate and a third organic layer is stacked over the first organic layer and the second organic layer through an intermediate electrode. The third organic layer has an emission spectrum peak wavelength which is longer than an emission spectrum peak wavelength of at least one of the first organic layer and the second organic layer.

Claims

1. An organic electroluminescence display apparatus, comprising:

a substrate; and

multiple organic electroluminescence devices which are stacked on the substrate, each of which comprises electrodes and an organic layer which includes at least an emission layer and which is sandwiched by the electrodes,

wherein the organic layers comprises;

a first organic layer contained in a first organic electroluminescence device and a second organic layer contained in a second organic electroluminescence device, the first organic layer and the second organic layer being arranged side by side in an emission region corresponding to a pixel, wherein a distance between the electrodes sandwiching the first organic layer and a distance sandwiching the second organic layer are different; and

a third organic layer having a same thickness continuously stacked over the first organic layer and the second organic layer through an intermediate electrode, and

wherein the third organic layer has an emission spectrum peak wavelength which is longer than an emission spectrum peak wavelength of at least one of the first organic layer and the second organic layer.

2. The organic electroluminescence display apparatus according to claim 1, wherein the intermediate electrode provided between the first organic layer and the second organic layer, and the third organic layer comprises a metal thin film.

3. The organic electroluminescence display apparatus according to claim 1, wherein the third organic layer has a luminescent color of red.

4. The organic electroluminescence display apparatus according to claim 1, wherein the third organic layer has a luminescent color of green.

5. The organic electroluminescence display apparatus according to claim 1, wherein:

the first organic electroluminescence device satisfies the following formula (1);

2L1/λ

1+δ

/2π

=m  

 

(1)

where L1 indicates an optical distance between an emission region of an emission layer in the first organic layer and a reflection surface of the electrode which is disposed between the first organic layer and the substrate, λ

1 indicates an emission spectrum peak wavelength of the emission layer in the first organic layer, δ

indicates a phase shift amount on the electrode which is disposed between the first organic layer and the substrate, and m indicates a natural number; and

the second organic electroluminescence device satisfies the following formula (2);

2L2/λ

2+δ

/2π

=m  

 

(2)

where L2 indicates an optical distance between an emission region of an emission layer in the second organic layer and a reflection surface of the electrode which is disposed between the second organic layer and the substrate, λ

2 indicates an emission spectrum peak wavelength of the emission layer in the second organic layer, δ

indicates a phase shift amount on the electrode which is disposed between the second organic layer and the substrate, and m indicates a natural number.

6. An organic electroluminescence display apparatus, comprising:

a substrate; and

multiple organic electroluminescence devices which are stacked on the substrate, each of which comprises electrodes and an organic layer sandwiched by the electrodes,

wherein the organic layers comprises;

a first organic layer having a same thickness continuously formed over two sub-pixels in an emission region corresponding to a pixel; and

a second organic layer and a third organic layer which are arranged side by side on the first organic layer, wherein a distance between the electrodes sandwiching the second organic layer and a distance sandwiching the third organic layer are different, and

wherein the first organic layer has an emission spectrum peak wavelength which is longer than an emission spectrum peak wavelength of at least one of the second organic layer and the third organic layer.