OLED Getter Openings for Moisture Protection
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Solution Overview
Problem
The challenge in organic light emitting diode (OLED) displays is to effectively prevent moisture penetration without increasing the cell gap between the display substrate and the encapsulation substrate, as higher getter amounts can lead to deteriorated adhesion and additional costs from etching processes.
Innovation Solution
The OLED display incorporates a getter that fills specific openings in the data driving line, gate driving line, and other layers, increasing the getter's amount without expanding the cell gap, thereby enhancing moisture absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of getter is increased to improve moisture penetration prevention, then moisture protection is improved, but cell gap increases and adhesion deteriorates
Solution Approach 1:
The patent introduces openings in multiple layers (gate insulating layer, interlayer insulating layer, protective layer, pixel defining layer) to create vertical pathways for getter placement. This multi-dimensional approach allows increasing getter amount by utilizing vertical space through the stacked layers rather than only horizontal expansion, thereby improving moisture protection without necessarily increasing cell gap.
Solution Approach 2:
The getter is nested within openings formed in multiple stacked layers (gate insulating layer, interlayer insulating layer, protective layer, pixel defining layer). This nested structure allows the getter to be positioned throughout the vertical stack, maximizing moisture absorption capacity within the existing cell gap dimensions without requiring additional horizontal or vertical space.
2Reliability
If the amount of getter is increased to improve moisture penetration prevention, then moisture protection is improved, but additional etching processes and costs are required
Solution Approach 1:
The patent segments the getter placement into multiple discrete openings distributed across different layers (gate insulating layer, interlayer insulating layer, protective layer, pixel defining layer). This segmentation allows the getter to be placed in a distributed manner throughout the device structure, achieving enhanced moisture protection through multiple small openings rather than requiring extensive etching of large areas, thereby reducing process complexity.
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 approach allows for increased moisture absorption while maintaining the cell gap, thereby extending the OLED display's lifespan and reducing additional processing costs.
Implementation Method 1
a getter at the peripheral area and partially overlapping the common electrode, wherein the data driving line overlapping the getter has a plurality of data openings filled with the getter
Data Source
AI summary
An organic light emitting diode (OLED) display including: a substrate including a pixel area; a peripheral area enclosing the pixel area; a gate line; a data line; corresponding driving lines; a pixel electrode; an organic light emitting layer; a common electrode; and a getter formed at the peripheral area and partially overlapping the common electrode, wherein the driving lines overlapping the getter have a plurality of openings filled with the getter such that the getter amount may be increased, thereby increasing the moisture absorption amount.