OLED Display Moisture Barrier Design
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Solution Overview
Problem
In large-sized organic light emitting diode (OLED) displays, moisture permeation through the organic emission layer can occur due to the formation of moisture absorbents and sealing members on the protective layer, leading to deterioration and requiring a wider peripheral area to prevent damage, which limits the ability to narrow the bezel.
Innovation Solution
The OLED display design includes a pixel substrate with a pixel protective layer and a peripheral protective layer separated by a specific distance, with a moisture absorbent between the substrates and a sealing member outside the absorbent, preventing moisture movement and allowing for a narrower peripheral area by overlapping the protective layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the moisture absorbent and sealing member are formed on the protective layer, then moisture permeation is reduced, but the peripheral area width must be increased
Solution Approach 1:
The patent introduces a vertical separation between the pixel protective layer and peripheral protective layer, moving the moisture absorbent to a different spatial dimension (below the pixel protective layer) rather than placing it on the peripheral protective layer. This dimensional repositioning allows the moisture absorbent to function effectively while reducing the horizontal peripheral area width.
Solution Approach 2:
The protective layer is segmented into a pixel protective layer and a peripheral protective layer that are separated from each other. This segmentation allows the moisture absorbent to be positioned in the space between these layers, enabling effective moisture protection without requiring the moisture absorbent to extend to the edges of the display.
2Reliability
If the peripheral area width is increased to accommodate moisture absorbent and sealing member, then moisture protection is improved, but the bezel cannot be narrowed
Solution Approach 1:
The patent utilizes the vertical dimension by positioning the moisture absorbent below the pixel protective layer, in the space between the pixel substrate and sealing substrate. This vertical placement eliminates the need to increase the horizontal bezel width, allowing for narrow bezel designs while maintaining effective moisture protection.
Solution Approach 2:
The moisture absorbent is nested within the structure formed by the pixel substrate and sealing substrate, specifically in the space between these layers. This nesting approach allows the moisture absorbent to be contained within the display structure without adding to the external dimensions, enabling narrow bezel design.
3Reliability
If the pixel protective layer and peripheral protective layer are separated by a predetermined distance, then moisture movement is blocked, but the peripheral area must be wider
Solution Approach 1:
The protective layer is divided into separate pixel protective layer and peripheral protective layer components with a gap between them. This segmentation creates a physical barrier that blocks moisture movement from the peripheral area to the pixel area, while the moisture absorbent positioned in this gap provides additional moisture protection without requiring the peripheral protective layer to extend further outward.
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 design effectively blocks moisture permeation by maintaining a separation distance between the pixel and peripheral protective layers, reducing the risk of moisture reaching the organic emission layer and minimizing the outer margin, thus enabling a narrower bezel and improved display performance.
Implementation Method 1
a moisture absorbent between the pixel substrate and the sealing substrate
Implementation Method 2
electrons injected from one electrode are coupled with holes injected from the other electrode in the organic emission layer to form excitons that emit light while emitting energy
Data Source
AI summary
An OLED display includes a pixel substrate including a pixel area at which an organic light emitting member is located, and a peripheral area surrounding the pixel area, a pixel protective layer located in the pixel area, a peripheral protective layer separated from the pixel protective layer and located in the peripheral area, a sealing substrate opposite to the pixel substrate, a moisture absorbent between the pixel substrate and the sealing substrate, and on and overlapping the peripheral protective layer, and a sealing member between the pixel substrate and the sealing substrate, and located at an outer side of the moisture absorbent.