OLED Display Substrate Separation Pillar Encapsulation
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Solution Overview
Problem
Organic light emitting diode (OLED) display substrates are prone to moisture and oxygen permeation, especially in window regions where accessories like cameras are installed, due to inadequate encapsulation, leading to exposure of organic material layers and electrode layers, which results in display defects and short circuits.
Innovation Solution
The use of separation pillars in the peripheral area, comprising alternately stacked metal and insulating layers, to isolate and encapsulate the organic material and electrode layers, forming enclosures that surround the display area and prevent exposure to external moisture and oxygen, with a three-layer metallic structure similar to source and drain electrodes of thin film transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If accessories like cameras are installed in window regions of OLED display substrates, then functionality and adaptability are improved, but encapsulation is compromised leading to moisture and oxygen permeation
Solution Approach 1:
The encapsulation structure is segmented into a first encapsulation layer and a second encapsulation layer that are offset relative to each other. The first encapsulation layer surrounds the display area, while the second encapsulation layer extends into the peripheral area to cover openings. This segmentation allows the encapsulation to adapt to the presence of accessories in window regions while maintaining protection against moisture and oxygen permeation.
2Reliability
If the encapsulating layer is extended into the peripheral area to cover openings, then protection against moisture and oxygen is improved, but device complexity increases
Solution Approach 1:
The second encapsulation layer is merged with the peripheral structure of the display substrate, integrating the protective function into the existing device architecture. This merging approach extends protection to the peripheral area where accessories are installed without adding entirely separate complex encapsulation systems.
Solution Approach 2:
The second encapsulation layer serves multiple functions: it protects the peripheral area from moisture and oxygen, provides structural support, and maintains the integrity of the display substrate while accommodating accessories. This multi-functionality reduces the need for additional specialized components.
3Adaptability or versatility
If organic material layers and electrode layers are exposed in window regions, then accessibility for accessories is improved, but display defects and short circuits occur due to moisture and oxygen exposure
Solution Approach 1:
The encapsulation layers are designed to preemptively protect the organic material layers and electrode layers from moisture and oxygen before harmful exposure can occur. The first encapsulation layer provides initial protection over the display area, while the second encapsulation layer extends to cover peripheral openings, preventing harmful factors from reaching exposed regions.
Data Source
AI summary
A display substrate having a display area and a peripheral area is provided. The display substrate includes a plurality of light emitting elements on a base substrate and in the display area; an encapsulating layer on a side of the plurality of light emitting elements away from the base substrate; and a first separation pillar in the peripheral area and on the base substrate, the first separation pillar forming a first enclosure substantially surrounding a first area. The first separation pillar includes a plurality of metal layers and a plurality of insulating layers alternately stacked on the base substrate. A width of a respective one of the plurality of insulating layers along a cross-pillar direction across the first enclosure and from the display area toward the first separation pillar is greater than a width of a respective one of the plurality of metal layer along the cross-pillar direction.