Series-Connected LED Pixel Layout With Overlapping Contact Electrodes
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Solution Overview
Problem
Existing display devices have low emission efficiency due to a low ratio of light emitting elements connected in series, limiting the improvement of light output per pixel.
Innovation Solution
A display device design where light emitting elements are connected in series with contact electrodes overlapping and contacting ends of adjacent elements, allowing for improved series connection and enhanced emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are connected in parallel to increase emission efficiency, then the light output amount per pixel is improved, but the ratio of light emitting elements arranged in series between pixel electrodes decreases
Solution Approach 1:
The patent transitions from a planar connection structure to a three-dimensional structure by having contact electrodes overlap and extend in multiple directions. The second contact electrode detours around the third contact electrode and extends to contact the first light emitting element, creating a vertical stacking arrangement that increases the series connection ratio without increasing pixel area.
Solution Approach 2:
The contact electrodes are arranged in an overlapping, nested configuration where the second contact electrode overlaps and detours around the third contact electrode. This nested arrangement allows multiple contact points to be positioned within a compact area, enabling series connections between multiple light emitting elements while maintaining a small pixel footprint.
2Use of energy by moving object
If more light emitting elements are connected in series to improve emission efficiency, then the input current per pixel is reduced, but the device complexity and contact electrode arrangement becomes more complex
Solution Approach 1:
The contact electrodes serve multiple functions: they provide electrical connections for series-circuit elements, act as overlapping structural components that define spatial relationships, and enable compact pixel design. The second contact electrode simultaneously contacts the first light emitting element and extends to overlap the third contact electrode, achieving multiple connection objectives with a single structural element.
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 emission efficiency by optimizing the series connection of light emitting elements, leading to improved light output per pixel.
Implementation Method 1
a first light emitting element located between the first electrode and the second electrode; at least one second light emitting element located between the second electrode and the third electrode
Data Source
AI summary
A display device includes a substrate. A first electrode, a second electrode, and a third electrode are on the substrate, and are sequentially arranged along a first direction. A first light emitting element is located between the first electrode and the second electrode. A second light emitting element is located between the second electrode and the third electrode. A first contact electrode overlaps the first electrode and one end of the first light emitting element, and is in contact with the first electrode and the one end of the first light emitting element. A second contact electrode overlaps and is in contact with the other end of the first light emitting element. A third contact electrode overlaps and is in contact with the second electrode and the other end of the second light emitting element. The second contact electrode extends while detouring the third contact electrode.