Organic el display panel production method

Patent metadata

Field	Value
Publication number	US-2017033288-A1
Application number	US-201515302900-A
Country	US
Kind code	A1
Filing date	Mar 27, 2015
Priority date	Apr 10, 2014
Publication date	Feb 2, 2017
Grant date	—

Abstract

A method for manufacturing an organic EL display panel, including: forming first electrodes over a substrate; defining, above the substrate, pixel formation regions lining up in a row direction and a column direction, by forming banks over the substrate; applying ink to each pixel formation region by causing a plurality of nozzles lining up in a straight line to discharge the ink to the pixel formation regions while displacing the nozzles relative to the substrate in a scanning direction; drying the ink to form functional layers in the pixel formation regions; and forming a second electrode at a position covering the pixel formation regions. In the application of ink, an angle θ between the scanning direction and the row direction is set to more than 0° and less than 90° and each nozzle applies the ink across a plurality of rows of the pixel formation regions.

First claim

1 . A method for manufacturing an organic EL display panel, the method comprising:
preparing a substrate; forming a plurality of first electrodes over the substrate; defining, above the substrate, a plurality of pixel formation regions lining up in a row direction and a column direction to form a matrix, by forming banks over the substrate having the first electrodes formed thereon; applying ink containing functional material to each of the pixel formation regions by causing a plurality of nozzles lining up in a straight line to discharge the ink to the pixel formation regions while displacing the nozzles relative to the substrate in a scanning direction along a main surface of the substrate; drying the ink having been applied to form functional layers containing the functional material in the pixel formation regions; and forming one or more layers, at least including a second electrode, at a position covering the pixel formation regions having the functional layers formed therein, wherein in the application of ink, an angle θ between the scanning direction and the row direction is set to more than 0° and less than 90° and each of the nozzles applies the ink across a plurality of rows of the pixel formation regions.

2 . The method according to claim 1 , wherein
the pixel formation regions are defined to be located at a fixed pitch Dp in the row direction and at a fixed pitch Dp 2 in the column direction, and in the application of ink, the angle θ is set to satisfy Dp×tan θ≠Dp 2 .

3 . The method according to claim 2 , wherein
in the application of ink, the angle θ is set to satisfy:

θ
=

sin

-
1



(

N
·
Dn
·
sin




α

Dp

)

[

Math
.


1

]

where Dn denotes a fixed pitch between the nozzles, α denotes an angle between the scanning direction and the straight line, and N is a positive integer.

4 . The method according to claim 3 , wherein
the pixel formation regions are defined to each include sub-pixel formation regions corresponding to colors red, green, and blue, ink application with the nozzles is performed separately, by using different inks, for sub-pixel formation regions corresponding to the color red, sub-pixel formation regions corresponding to the color green, and sub-pixel formation regions corresponding to the color blue, and the positive integer N for angle θ defining the scanning direction in application of one of the inks with which luminance is most dependent upon application amount is no smaller than the positive integer N for angle θ defining the scanning direction in application of each of the other ones of the inks.

5 . The method according to claim 4 , wherein
the sub-pixel formation regions are each elongated in a direction orthogonal to the row direction, and in the application of any of the inks, the angle θ defining the scanning direction is set to more than 0° and less than 45°.

6 . The method according to claim 5 , wherein
in the application of any of the inks, the angle θ defining the scanning direction is set to satisfy:

θ
≤

tan

-
1



(

Lsp
Dp

)

[

Math
.


2

]

where Lsp denotes the length of the sub-pixel formation regions in the direction orthogonal to the row direction.

7 . The method according to claim 6 , wherein
in the application of any of the inks, the angles θ and α defining the scanning direction are set to satisfy:
α≦90°−θ  [Math. 3]

8 . The method according to claim 7 , wherein
the main surface of the substrate has a rectangular shape, the pixel formation regions are defined so that the row direction matches a direction in which long sides of the substrate extend and the column direction matches a direction in which short sides of the substrate extend, and in the application of any of the inks, the angle θ defining the scanning direction is set to satisfy:

[

H



cos



θ

+

W



din



θ

L



sin


Assignees

• Joled Inc

Inventors

• Takahashi Yasuyuki

Classifications

• B41J25/003

  for changing the angle between a print element array axis and the printing line, e.g. for dot density changes · CPC title

• B05D1/36

  Successively applying liquids or other fluent materials, e.g. without intermediate treatment · CPC title

• H05B33/10

  Apparatus or processes specially adapted to the manufacture of electroluminescent light sources · CPC title

• B05D1/26

  performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface · CPC title

• B05D3/0254

  After-treatment · CPC title