Display Panel Contact-Hole Barrier Against Water Vapor
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Solution Overview
Problem
Existing display panels face issues with water vapor intrusion at contact holes, affecting the manufacturing yield of subsequent film layers due to the exposure of organic layers.
Innovation Solution
Incorporating a pixel definition layer made of inorganic material that covers the side surface of the organic layer within the contact hole, and optionally an isolation structure extending into the contact hole to contact the wiring, thereby preventing water vapor intrusion and ensuring the integrity of subsequent film layer manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the organic layer is exposed at the contact hole to allow wiring connection, then the electrical connectivity is improved, but the organic layer becomes vulnerable to water vapor intrusion which reduces manufacturing yield
Solution Approach 1:
The patent introduces a pixel definition layer made of inorganic material as an intermediary structure. This layer extends into the contact hole and covers the side surface of the organic layer, creating a protective barrier that prevents water vapor from reaching the organic layer while allowing the auxiliary electrode to make electrical contact with the wiring layer through the contact hole.
Solution Approach 2:
The patent employs a composite structure combining organic and inorganic materials. The organic layer provides the base structure, while the inorganic pixel definition layer provides water vapor barrier properties. This composite approach allows simultaneous achievement of electrical connectivity and protection against water vapor intrusion.
2Ease of manufacture
If the contact hole is kept open for electrode connection, then the manufacturing process is simplified, but the quality of subsequent film layers is compromised due to water vapor exposure
Solution Approach 1:
The patent applies preliminary action by forming the pixel definition layer before depositing subsequent film layers. This inorganic layer is prepared in advance to cover the organic layer's side surface in the contact hole region, preemptively preventing water vapor intrusion that would otherwise occur during subsequent manufacturing processes.
Solution Approach 2:
The patent applies local quality by making the pixel definition layer extend specifically into the contact hole region where water vapor intrusion is most likely to occur. The layer covers only the necessary area (the side surface of the organic layer within the contact hole) rather than the entire surface, providing targeted protection while maintaining manufacturing efficiency.
Data Source
AI summary
A display panel, a method for manufacturing a display panel, and an electronic device, and the display panel includes: a substrate; a wiring layer located on a side of the substrate, here, the wiring layer includes a first wiring; an organic layer located on a side of the wiring layer away from the substrate, here, the organic layer includes a contact hole exposing at least a part of the first wiring; and a pixel definition layer located on a side of the organic layer away from the substrate, here, the pixel definition layer extends into the contact hole and covers a side of the organic layer facing the contact hole, and a part of the pixel definition layer located within the contact hole exposes at least a part of the first wiring.