Thin-Film Transistor Array Substrate for Organic Light-Emitting Display
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing manufacturing processes for organic light-emitting displays are complex and costly due to the increased number of mask processes required, leading to high costs and complications in transferring fine patterns onto substrates, which affects the aperture ratio and optical extraction efficiency.
Innovation Solution
A thin-film transistor array substrate and organic light-emitting display design that includes a buffer layer, insulating layers, a pixel electrode formed with transparent conductive material, an intermediate layer with a light-emitting layer, and a facing electrode that reflects light, along with a method involving multiple mask processes to form gaps and openings that optimize the light-emitting region and reduce mask complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple mask processes are used to transfer fine patterns onto the substrate, then the pattern precision is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple mask processes into a single integrated manufacturing process. Specifically, the pixel electrode, intermediate layer, and facing electrode are formed in one continuous process sequence without requiring separate mask steps for each layer, thereby reducing mask complexity while maintaining fine pattern precision
Solution Approach 2:
The single mask process performs multiple functions simultaneously: it defines the pixel electrode pattern, guides the intermediate layer formation, and establishes the facing electrode configuration. This multi-functional approach eliminates the need for separate specialized masks for each layer
2Productivity
If the light-emitting region is expanded to increase aperture ratio, then the optical extraction efficiency is improved, but the risk of light scattering and short circuit increases
Solution Approach 1:
The patent extends the intermediate layer from a two-dimensional planar structure to a three-dimensional structure that covers the upper side and outer side surfaces of the pixel electrode. This vertical extension creates effective electrical isolation between the pixel electrode and facing electrode while allowing the opening to expand horizontally, thus increasing aperture ratio without compromising reliability
Solution Approach 2:
The intermediate layer acts as an intermediary barrier between the pixel electrode and facing electrode. By positioning this insulating layer to cover the outer side surfaces of the pixel electrode, the patent prevents direct contact and potential short circuits while allowing the light-emitting region to expand
3Illumination intensity
If the facing electrode is positioned close to the pixel electrode to improve optical extraction efficiency, then the light emission is enhanced, but the risk of electrical short circuit increases
Solution Approach 1:
The intermediate layer is formed to extend vertically along the outer side surfaces of the pixel electrode, creating a three-dimensional insulating barrier. This vertical dimension provides effective electrical isolation while allowing the facing electrode to be positioned close to the pixel electrode for optimal optical extraction efficiency
Solution Approach 2:
The intermediate layer serves as an intermediary insulating structure that physically separates the pixel electrode and facing electrode. By covering both the upper side and outer side surfaces, it maintains electrical isolation while permitting close spacing for enhanced light emission
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 design enhances the aperture ratio and optical extraction efficiency by simplifying the manufacturing process, minimizing light scattering, and increasing the light-emitting region, while reducing the complexity and cost associated with mask processes.
Implementation Method 1
The facing electrode may be a reflection electrode that reflects light generated from the organic light-emitting layer
Data Source
AI summary
A thin-film transistor array substrate, an organic light-emitting display having the same, and a method of manufacturing the organic light-emitting display are disclosed. In one embodiment, the thin-film transistor array substrate includes a buffer layer formed on a substrate, a first insulating layer formed on the buffer layer, a pixel electrode formed on the first insulating layer using a transparent conductive material, an intermediate layer that covers an upper side and outer side-surfaces of the pixel electrode and includes a organic light-emitting layer, a gap formed by etching the first insulating layer and the buffer layer at a peripheral of the pixel electrode, and a facing electrode that is formed on an upper side and outer side-surfaces of the pixel electrode to cover the intermediate layer and the gap.