OLED Second Bank Surface Modification for Film Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic light-emitting devices face issues with improper formation of organic films, such as hole transport layers, over second banks, leading to uneven thickness and low light-emission performance due to insufficient wetting with ink.
Innovation Solution
The organic light-emitting device features a structure where second banks have a thickness no greater than 20% of the first banks and a surface contact angle of 5° or smaller, ensuring proper wetting and repelling of ink, with continuous charge transport and organic light-emitting layers covering the gap areas between first and second banks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If second banks are used to define light-emitting portions, then device structure is established, but organic film formation becomes improper due to insufficient wetting
Solution Approach 1:
The patent applies local quality by creating distinct surface properties at different locations. The second bank is designed with a specific contact angle (5° or smaller) only at its upper surface where organic films are deposited, while maintaining its structural function elsewhere. This localized surface modification ensures proper wetting and film formation precisely where needed without affecting the overall device structure.
Solution Approach 2:
The patent changes the contact angle parameter of the second bank's upper surface to 5° or smaller, which is significantly different from conventional structures. This parameter change fundamentally alters the wetting behavior of the organic film precursor solution, ensuring uniform film deposition over the second bank structure and eliminating the formation defects.
2Strength
If second banks with conventional thickness are used, then structural support is provided, but organic film thickness becomes uneven
Solution Approach 1:
The patent applies local quality by creating distinct surface properties at different locations. The second bank is designed with a specific contact angle (5° or smaller) only at its upper surface where organic films are deposited, while maintaining its structural function elsewhere. This localized surface modification ensures proper wetting and film formation precisely where needed without affecting the overall device structure.
Solution Approach 2:
The patent changes the contact angle parameter of the second bank's upper surface to 5° or smaller, which is significantly different from conventional structures. This parameter change fundamentally alters the wetting behavior of the organic film precursor solution, ensuring uniform film deposition over the second bank structure and eliminating the formation defects.
3Ease of manufacture
If second banks are positioned near first bank base portions, then gap areas are defined, but organic film wetting becomes insufficient
Solution Approach 1:
The patent applies local quality by creating distinct surface properties at different locations. The second bank is designed with a specific contact angle (5° or smaller) only at its upper surface where organic films are deposited, while maintaining its structural function elsewhere. This localized surface modification ensures proper wetting and film formation precisely where needed without affecting the overall device structure.
Solution Approach 2:
The patent changes the contact angle parameter of the second bank's upper surface to 5° or smaller, which is significantly different from conventional structures. This parameter change fundamentally alters the wetting behavior of the organic film precursor solution, ensuring uniform film deposition over the second bank structure and eliminating the formation defects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances light-emission performance by preventing insufficient wetting and ensuring consistent film thickness, thereby improving the overall light-emission quality of the device.
Implementation Method 1
a surface contact angle of 5° or smaller, ensuring proper wetting and repelling of ink
Data Source
AI summary
Organic light-emitting device including light-emitting portions disposed in two intersecting directions along a substrate main surface. Each light-emitting portion, in a first direction intersecting the substrate main surface, includes first and second electrodes, a charge transport layer, and an organic light-emitting layer, and is partitioned from adjacent light-emitting portions by first banks extending in a third direction being one of the two directions and second banks extending in a second direction being the other of the two directions. Each area between adjacent first banks is covered by the charge transport and organic light-emitting layers extending continuously across the area over the second banks. The first and second banks contain insulating material, a thickness of the second banks is no greater than 20% a height of the first banks, and the second banks have a surface portion contact angle smaller than that of the first banks.