Adhesive Reinforcement Layer for Flat Panel Display Pixel Definition
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Solution Overview
Problem
Flat panel displays experience instability in charge movement due to increased potential barriers between the pixel definition layer and the planarization layer, resulting from chipping of the pixel definition layer if not formed stably.
Innovation Solution
Incorporating an adhesive reinforcement layer between the planarization layer and the pixel definition layer, formed using materials like siloxane, cyclohexane, or toluene, with a thickness of 10 Å to 50 Å, and optionally treated with sulfur, phosphorous, or hydrogen-helium, to enhance adhesion and prevent chipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pixel definition layer is formed directly on the planarization layer, then the structure is simple, but the pixel definition layer chips due to poor adhesion
Solution Approach 1:
An adhesive reinforcement layer is introduced as an intermediary between the planarization layer and the pixel definition layer. This intermediate layer specifically addresses the adhesion problem without requiring complete redesign of the overall device structure, thereby resolving the contradiction between structural simplicity and adhesion reliability.
Solution Approach 2:
The adhesive reinforcement layer is formed using composite material composition including siloxane, cyclohexane, toluene, para-xylene, and decahydronaphthalene. This composite material approach enhances the adhesive properties and prevents chipping while maintaining reasonable structural complexity.
2Ease of manufacture
If the pixel definition layer is formed directly on the planarization layer, then the manufacturing process is simple, but charge movement becomes unstable due to potential barriers
Solution Approach 1:
The adhesive reinforcement layer serves as a mediator that eliminates potential barriers between the pixel definition layer and planarization layer, ensuring stable charge movement. The layer is formed through a relatively simple process that integrates well with existing manufacturing workflows.
Solution Approach 2:
The adhesive reinforcement layer modifies the interface parameters between layers by providing optimal adhesion properties and electrical characteristics. The specific composition and thickness (10-50 Å) of the layer are optimized to reduce potential barriers and ensure stable charge transport.
3Reliability
If an adhesive reinforcement layer is added between the planarization layer and pixel definition layer, then adhesion and charge movement stability are improved, but the device structure becomes more complex
Solution Approach 1:
The adhesive reinforcement layer is a thin intermediate layer (10-50 Å) that provides necessary adhesion and electrical functionality without significantly increasing overall device complexity. The layer integrates seamlessly into the existing multi-layer structure.
Solution Approach 2:
The adhesive reinforcement layer is implemented as an ultra-thin film with specific composition that provides enhanced adhesion and electrical properties while maintaining minimal thickness. This thin film approach improves reliability without substantially increasing device complexity or manufacturing difficulty.
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
The adhesive reinforcement layer improves the adhesive property of the pixel definition layer, preventing chipping and ensuring stable charge movement, enabling the creation of high-resolution and large-area flat panel displays.
Implementation Method 1
an adhesive reinforcement layer interposed between and contacting the planarization layer and the pixel definition layer
Data Source
AI summary
A flat panel display includes a thin film transistor formed on a substrate; a planarization layer formed on the thin film transistor; a first electrode layer formed on the planarization layer and electrically connected with the thin film transistor through the via hole formed in the planarization layer; a pixel definition layer formed on the planarization layer and in which an opening for at least partially exposing the first electrode layer is formed; an adhesive reinforcement layer formed at least between the planarization layer and the pixel definition layer on the top of the planarization layer; an emitting layer formed on the first electrode layer; and a second electrode layer formed on the emitting layer and the pixel definition layer. The flat panel display has an improved adhesive property between a pixel definition layer and a planarization layer, which prevents a chipping phenomenon of the pixel definition layer.