OLED Dummy Pattern Layout for Edge Dewetting Control
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Solution Overview
Problem
Dewetting issues during the solution process for forming light emission layers in organic light emitting displays lead to non-uniformity and pixel defects, particularly in the outer parts of the display.
Innovation Solution
A display device design that includes a dummy pattern on the outer part of the display area, extending along horizontal and vertical directions, and featuring a third dummy part with a sawtooth pattern, which helps in preventing dewetting by guiding the solution aggregation away from the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a solution process is used to form the light emitting layer through an inkjet device, then manufacturing efficiency and productivity are improved, but dewetting occurs in the outer part causing pixel defects
Solution Approach 1:
The patent applies preliminary action by forming a dummy pattern in the non-display area before the solution coating process. This dummy pattern pre-establishes the aggregation behavior of the solution, guiding it to accumulate at the edges rather than dewet during drying, thereby preventing pixel defects while maintaining solution process efficiency
Solution Approach 2:
The dummy pattern acts as an intermediary element between the solution and the display area. It mediates the solution's aggregation and drying behavior by providing a controlled interface that directs solution flow and prevents harmful dewetting effects from reaching the pixel regions
2Manufacturing precision
If the solution is applied to the outer part of the display area, then uniform light emission is achieved, but dewetting occurs causing non-uniformity
Solution Approach 1:
The patent applies local quality by creating a dummy pattern with specific local properties in the non-display area. This pattern has different surface characteristics compared to the display area, locally controlling solution aggregation behavior at the edges while maintaining uniform solution composition and light emission quality in the pixel regions
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
The proposed solution effectively prevents dewetting in the direction towards the pixels, ensuring uniform light emission and reducing pixel defects by utilizing the aggregation properties of the solution within the dummy pattern.
Implementation Method 1
the solution process is performed in a way of applying a solution to a preset area to form a light emitting layer and then dry the solution
Implementation Method 2
the light emission layer may not be properly formed in the pixels provided in an outer part due to dewetting which occurs in the outer part of the solution
Data Source
AI summary
A display device includes a substrate including a display area provided with pixels disposed therein and a non-display area surrounding the display area and provided with a dummy pattern disposed therein; a light emitting layer formed on the pixels and the dummy pattern; and a bank surrounding the light emitting layer, wherein the dummy pattern includes: a first dummy part extending along a horizontal direction; a second dummy part extending along a vertical direction; and a third dummy part provided by extending the first dummy part and the second dummy part in a corner area where the first dummy part and the second dummy part are connected to each other and having a pattern protruding in an outer direction of the substrate.