Display Device Common Layer Oxidation Prevention
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Solution Overview
Problem
Current display devices face challenges in enhancing reliability and touch screen panel characteristics, particularly in preventing oxidation of the common layer and counter electrode due to gas generated during manufacturing, which can lead to pixel shrinkage and reduced sensitivity of touch sensors.
Innovation Solution
Incorporating a common layer with a film density between 3 g/cm3 to 10 g/cm3, including ytterbium (Yb) and Yb-oxygen (O) bonds, and a counter electrode with an Ag-based or Al-based alloy, ranging from 95% to 100% concentration, along with specific thickness and resistance values, to prevent oxidation and improve touch sensor sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common layer and counter electrode are made with conventional materials and structures, then the manufacturing process is simple, but oxidation occurs due to gas generated during manufacturing, leading to pixel shrinkage and reduced reliability
Solution Approach 1:
The patent introduces a buffer layer as an intermediary between the common layer and the organic insulating layer. This buffer layer specifically prevents gas generated during manufacturing from reaching and oxidizing the common layer and counter electrode, thereby resolving the oxidation issue without requiring complex material substitutions throughout the entire device structure.
Solution Approach 2:
The buffer layer creates a protective environment that isolates the common layer and counter electrode from oxidizing gases during manufacturing. By establishing this inert barrier, the patent prevents oxidation without needing to modify the base materials of the common layer or counter electrode, maintaining simplicity while improving reliability.
2Reliability
If the common layer film density is increased to prevent oxidation, then oxidation resistance improves, but manufacturing complexity increases
Solution Approach 1:
Instead of increasing the density of the common layer itself, the patent introduces a buffer layer as a mediator that blocks oxidizing gases. This approach achieves oxidation protection without the need for precise control of common layer film density, thereby avoiding the manufacturing precision challenges associated with high-density film formation.
Solution Approach 2:
The buffer layer acts as a sacrificial protective element that absorbs the harmful effects of manufacturing gases. Rather than making the common layer itself more resistant through high density, a separate, simpler buffer layer is used to provide the necessary protection, simplifying the overall manufacturing process.
3Reliability
If the counter electrode thickness is increased to reduce resistance, then electrical conductivity improves, but touch sensor sensitivity decreases
Solution Approach 1:
The patent optimizes the counter electrode thickness to a specific range (5-100 nm) that balances electrical conductivity and touch sensor sensitivity. By precisely controlling the thickness parameter rather than simply increasing it, the patent achieves both low resistance and high touch sensitivity, resolving the trade-off between these two properties.
Solution Approach 2:
The patent uses composite structures including the counter electrode, common layer, and buffer layer to achieve the desired electrical and sensing properties. This composite approach allows the counter electrode to be thin (maintaining touch sensitivity) while the overall structure provides sufficient electrical conductivity through the combined effects of multiple layers.
Data Source
AI summary
A display device includes a substrate, a pixel electrode disposed on the substrate, a common layer disposed on the pixel electrode, and a counter electrode disposed on the common layer, wherein a film density of the common layer is in a range of about 3 g/cm3 to about 10 g/cm3.