OLED Alignment Marks for Emissive Layer Positioning
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Solution Overview
Problem
In organic light emitting diode (OLED) displays, ensuring the accurate positioning of the organic emissive layer is challenging due to the complexity of the layer structure and the need for precise alignment marks and patterns to facilitate correct material coating and alignment during manufacturing.
Innovation Solution
The solution involves an OLED display design that includes alignment marks and patterns made of the same material as the organic light emitting elements, positioned between the elements and the pixel definition layer, allowing for precise alignment and correct positioning of the organic emissive layer during the manufacturing process, which involves coating the organic material using a nozzle and adjusting its position based on alignment confirmation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment marks and patterns are introduced to ensure accurate positioning of the organic emissive layer, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
Alignment marks are introduced as intermediary elements between the substrate and the organic emissive layer to facilitate precise positioning. These marks serve as reference points that mediate the alignment process, allowing the coating nozzle to accurately deposit organic material without requiring complex direct positioning mechanisms.
Solution Approach 2:
The alignment marks and patterns are created as simplified copies or references of the final structure layout. By coating organic material over these marks and patterns, the complex positioning problem is reduced to a simpler pattern copying process, where the organic emissive layer replicates the alignment pattern geometry.
2Manufacturing precision
If alignment marks are positioned between the organic light emitting elements, then manufacturing precision is improved, but the display area is reduced
Solution Approach 1:
Alignment marks are strategically positioned only in specific local regions between the organic light emitting elements rather than uniformly across the entire display area. This localized placement provides necessary alignment references while minimizing the impact on the overall display area.
3Manufacturing precision
If the organic material is coated using a nozzle with position adjustment, then manufacturing precision is improved, but manufacturing time increases
Solution Approach 1:
Alignment marks and patterns are prepared in advance on the substrate before the organic material coating process. This preliminary preparation provides pre-established reference points that guide the nozzle positioning, eliminating the need for complex real-time alignment calculations and reducing the time required during the actual coating operation.
Data Source
AI summary
An organic light emitting diode display and a method for manufacturing an organic light emitting diode display are provided. An organic light emitting diode display includes: a substrate; a plurality of organic light emitting elements positioned on the substrate; a first alignment mark positioned between the plurality of organic light emitting elements; and a first organic pattern overlapping the first alignment mark on the substrate and including a same material as an organic material included in the plurality of organic light emitting elements.