ORGANIC EL DISPLAY PANEL AND ORGANIC EL DISPLAY DEVICE

• US 20170077190A1
• Filed: 05/21/2015
• Published: 03/16/2017
• Est. Priority Date: 05/23/2014
• Status: Abandoned Application

• Current Assignee: JOLED Inc.
• Original Assignee: JOLED Inc.
• Inventors: HASHIMOTO, Jun, NANNO, Hirotaka, TAKATA, Masakazu, AKIYAMA, Toshiyuki
• Application Number:
  US15/309,232
• Publication Number:
  US 20170077190A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G09F 9/30 in which the desired character or characters are formed by combining individual elements panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

Pixels include red sub-pixels, green sub-pixels, first blue sub-pixels that emit dark blue light, and second blue sub-pixels that emit light blue light. Above a substrate, first blue pixel electrodes and first blue organic light-emitting layers are layered in regions of the first blue sub-pixels and second blue pixel electrodes and second blue organic light-emitting layers are layered in regions of the second blue sub-pixels. The first blue light-emitting layers and the second blue light-emitting layers are made from the same material. In a direction perpendicular to a top plane of the substrate, a distance between top surfaces of the first blue organic light-emitting layers and top surfaces of the first blue pixel electrodes is less than a distance between top surfaces of the second blue organic light-emitting layers and the surfaces of the second blue pixel electrodes.

Claims

1. An organic electroluminescence (EL) display panel in which a plurality of pixels are arranged in a matrix of rows and columns on a substrate, each pixel including a red sub-pixel that emits red light, a green sub-pixel that emits green light, a first blue sub-pixel that emits dark blue light, and a second blue sub-pixel that emits light blue light, the organic EL display panel comprising:

the substrate;

a first blue pixel electrode and a first blue organic light-emitting layer layered above the substrate in a region of the first blue sub-pixel; and

a second blue pixel electrode and a second blue organic light-emitting layer layered above the substrate in a region of the second blue sub-pixel, wherein

the first blue organic light-emitting layer and the second blue organic light-emitting layer are made from the same material, and

in a direction perpendicular to a top plane of the substrate, a distance between a top surface of the first blue organic light-emitting layer and a top surface of the first blue pixel electrode is less than a distance between a top surface of the second blue organic light-emitting layer and a top surface of the second blue pixel electrode.

2. The organic EL display panel of claim 1, wherein

thickness of the first blue organic light-emitting layer is less than thickness of the second blue organic light-emitting layer.

3. The organic EL display panel of claim 2, wherein

thickness of the first blue organic light-emitting layer is less than 45 nm and thickness of the second blue organic light-emitting layer is from 45 nm to 65 nm.

4. The organic EL display panel of claim 1, wherein

a y value of CIE chromaticity of light emitted from the first blue sub-pixel is less than a y value of CIE chromaticity of light emitted from the second blue sub-pixel.

5. The organic EL display panel of claim 1, wherein

a first filter that lowers a y value of CIE chromaticity of light emitted from the first blue organic light-emitting layer is disposed above the first blue organic light-emitting layer.

6. The organic EL display panel of claim 5, wherein

a second filter that has a higher transmittance of light in a wavelength range from 600 nm to 800 nm than the first filter is disposed above the second blue organic light-emitting layer.

7. The organic EL display panel of claim 6, wherein

transmittance of light in a wavelength range from 300 nm to 800 nm by the first filter is 0.5 or less and transmittance of light in the wavelength range from 300 nm to 800 nm by the second filter is 0.7 or greater.

8. The organic EL display panel of claim 6, wherein

a y value of CIE chromaticity of light emitted upwards from the first filter in the first blue sub-pixel is less than a y value of CIE chromaticity of light emitted upwards from the second filter in the second blue sub-pixel.

9. The organic EL display panel of claim 6, wherein

a y value of CIE chromaticity of light emitted upwards from the first filter in the first blue sub-pixel is less than 0.1 and a y value of CIE chromaticity of light emitted upwards from the second filter in the second blue sub-pixel is from 0.1 to 0.18.

10. A method of manufacturing an organic electroluminescence (EL) display panel in which a plurality of pixels are arranged in a matrix of rows and columns, each pixel including a red sub-pixel that emits red light, a green sub-pixel that emits green light, a first blue sub-pixel that emits dark blue light, and a second blue sub-pixel that emits light blue light, the method comprising:

a process of forming a first blue pixel electrode and a first blue organic light-emitting layer layered in this order above the substrate in a region of the first blue sub-pixel, and forming a second blue pixel electrode and a second blue organic light-emitting layer layered in this order above the substrate in a region of the second blue sub-pixel, wherein

in the process of forming the first blue organic light-emitting layer and the second blue organic light-emitting layer, in a direction perpendicular to the plane of the substrate, a distance between a top surface of the first blue organic light-emitting layer and a top surface of the first blue pixel electrode is made to be less than a distance between a top surface of the second blue organic light-emitting layer and a top surface of the second blue pixel electrode layer.