Organic Electroluminescence Display Dual-Pixel Aperture Ratio
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Solution Overview
Problem
Conventional organic electroluminescence displays face challenges in achieving a high aperture ratio and uniform luminescence due to non-uniform thickness of the organic emission layer, especially in stepped pixel portions, and suffer from degraded visibility due to optical interference between adjacent pixels in stripe or delta type openings.
Innovation Solution
The solution involves forming two opposite pixels in a single pixel portion, arranged in a matrix form, with shared emission layers and opposite current directions, allowing for a higher aperture ratio and improved fabrication process, while maintaining uniform light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If stripe or delta type openings are used to increase aperture ratio, then aperture ratio is improved, but visibility is degraded due to optical interference between adjacent pixels
Solution Approach 1:
The pixel array is segmented into multiple sub-pixels arranged in a non-uniform pattern (e.g., 2x2 blocks with alternating active/inactive positions), which breaks the regular periodic structure that causes optical interference while maintaining high aperture ratio
Solution Approach 2:
The patent employs asymmetric pixel arrangement where pixels are positioned at different locations within pixel regions rather than uniform positioning, creating an irregular pattern that eliminates optical interference while achieving high aperture ratio
2Ease of manufacture
If conventional uniform pixel arrangement is used, then fabrication is simplified, but aperture ratio is reduced due to minute pattern requirements
Solution Approach 1:
The display is divided into multiple pixel regions with different pixel arrangements, allowing larger effective pixel areas while maintaining manageable fabrication complexity through modular design
Solution Approach 2:
The patent transitions from uniform two-dimensional pixel spacing to a three-dimensional arrangement where pixels are positioned at varying heights or depths, enabling larger aperture ratios without increasing planar pattern complexity
3Manufacturing precision
If stepped opening structure is used for pixel formation, then pixel definition is improved, but luminescence uniformity is degraded due to non-uniform organic emission layer thickness
Solution Approach 1:
The patent applies different structural characteristics to different regions: stepped openings provide precise pixel definition in critical areas, while compensation structures in other regions ensure uniform organic layer thickness and consistent luminescence
Solution Approach 2:
A compensation structure or intermediate layer is introduced to bridge the stepped opening regions, ensuring uniform organic emission layer deposition across the entire pixel area while maintaining the benefits of stepped pixel definition
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
This configuration enhances the aperture ratio and pattern precision, achieving better visibility and uniform luminescence properties compared to conventional methods, particularly in high-quality data processing requiring minute patterns.
Implementation Method 1
the organic electroluminescence display is an electro luminescence display that emits light when excitons are transitioned from an excited state to a ground state
Data Source
AI summary
An active matrix organic electro luminescence display in which two opposite pixels are formed in one pixel portion to achieve a high aperture ratio and to facilitate a fabrication process. The organic electro luminescence display is constructed with gate lines, data lines, and power lines which are formed on an insulating substrate, and pixel regions which is defined by the gate lines, the data lines and the power lines, wherein each of the pixel regions includes two opposite pixels, and the pixel regions are arranged in a matrix form.