Organic Light Emitting Display Wire Protection via Planarization
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Solution Overview
Problem
Organic light emitting displays are prone to scratched wires and dark spot defects due to the vulnerability of exposed wires and thin second pixel electrodes, leading to electrical shorts and degraded display quality.
Innovation Solution
A passivation layer is formed over the entire surface of the second pixel electrode and wires, with an encapsulation substrate protecting the pixel region, and a planarization layer covering the wires and pads to prevent physical damage and electrical connectivity issues, while via-holes and pad contact-holes ensure electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wires are exposed to enable signal receipt, then ease of operation is improved, but reliability deteriorates due to vulnerability to physical impact and scratching
Solution Approach 1:
The protection structure is segmented into multiple functional layers: a planarization layer that provides initial protection and flattening, and an encapsulation layer that provides additional environmental protection. This segmented approach allows the wires to remain accessible for signaling while being progressively protected by multiple layers.
Solution Approach 2:
The planarization layer acts as an intermediary between the exposed wires and the external environment. It provides a protective barrier that prevents direct physical contact and damage to the wires, while still allowing the wires to function for signal receipt.
2Weight of moving object
If second pixel electrode is formed thin, then weight is reduced, but reliability deteriorates due to pin hole formation and dark spot defects
Solution Approach 1:
The second pixel electrode is constructed as a composite structure with a reflective layer and a transparent conductive oxide layer. This composite material approach allows the electrode to maintain thin weight while the reflective layer provides structural integrity and prevents pin hole formation, eliminating dark spot defects.
Data Source
AI summary
An organic light emitting display that can avoid or reduce scratched wires and dark spot defects. The organic light emitting display includes a pixel substrate having an organic light emitting element formed on a pixel region and wires having pads formed around the pixel region, a passivation layer formed on the organic light emitting element and the wires, and an encapsulation substrate formed on the pixel substrate to protect the pixel region.