Pixel electrode insulation for display light emission
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Solution Overview
Problem
Current display technologies face challenges in efficiently integrating light emitting elements within pixels due to issues with electrode connections and insulation, leading to suboptimal light emission and electrical stability.
Innovation Solution
A pixel design incorporating a light emitting element with specific electrode configurations and insulating layers, where the electrodes are connected through contact portions and surrounded by insulating layers with varying refractive indices, and a bank structure to enhance light emission and electrical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrodes are closely integrated with light emitting elements to improve electrical connection, then electrical stability improves, but insulation reliability deteriorates
Solution Approach 1:
The patent introduces insulating layers as intermediary structures between the electrodes and light emitting elements. These insulating layers physically separate conductive elements while allowing electrical connection through controlled contact portions, preventing direct contact that would cause insulation failure while maintaining electrical stability through designed connection paths.
Solution Approach 2:
The patent applies different properties to different regions: insulating layers are provided in certain areas to prevent short circuits, while contact portions are created in specific locations to enable electrical connection. This localized differentiation of insulating and conductive properties allows simultaneous achievement of insulation reliability and electrical stability.
2Illumination intensity
If multiple insulating layers with different refractive indices are added to improve light emission efficiency, then light extraction improves, but device complexity increases
Solution Approach 1:
The patent changes the refractive index parameter by introducing multiple insulating layers with different refractive indices. This parameter variation optimizes light extraction efficiency by reducing total internal reflection at interfaces, allowing more light to escape from the light emitting element while managing the increased structural complexity through systematic material selection.
3Illumination intensity
If electrode and insulating layer ends are positioned at sidewalls to improve light emission, then light extraction efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent performs preliminary positioning by designing the insulating layers and electrodes to end at the sidewalls of the light emitting element before final assembly. This preliminary action establishes the optimal light extraction geometry in advance, allowing manufacturing processes to focus on achieving the specified positioning accuracy rather than adjusting it during assembly.
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 solution improves light emission efficiency and electrical stability by ensuring proper electrode connections and insulation, allowing for more effective use of light emitting elements in display devices.
Implementation Method 1
insulating layers with varying refractive indices
Data Source
AI summary
A display device includes a pixel in a display area. The pixel includes: a first electrode and a second electrode spaced from each other; a light emitting element between the first electrode and the second electrode, a first bank overlapping with one area of each of the first electrode and the second electrode in a plan view, the first bank including a first sidewall adjacent to the first end portion of the light emitting element and a second sidewall adjacent to the second end portion of the light emitting element; at least one of a third electrode on the first end portion of the light emitting element to connect the first end portion to the first electrode and a fourth electrode on the second end portion to connect the second end portion of the light emitting element to the second electrode.