Branched Display Electrode Layout for Series LED Voltage Division
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Solution Overview
Problem
Display devices using inorganic light-emitting diodes face challenges in reducing the capacity of driving transistors and minimizing power loss due to line resistance, particularly in efficiently connecting light-emitting elements in series to improve voltage-dividing efficiency.
Innovation Solution
A display device design featuring a specific electrode structure with branching electrodes and light-emitting elements connected in series between them, allowing for easier transistor capacity design and reduced power loss, where the third electrode is strategically placed between the first and second electrode branches to enhance voltage-dividing efficiency and power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light-emitting elements are connected in parallel, then the driving transistor capacity can be reduced, but the voltage-dividing efficiency deteriorates and power loss due to line resistance increases
Solution Approach 1:
The electrode structure is segmented into multiple branches (first electrode branch, second electrode branch, third electrode branch) that divide the current path into multiple parallel segments. This segmentation allows the light-emitting elements to be connected in series while distributing the current flow, thereby reducing the power loss due to line resistance and improving voltage-dividing efficiency without requiring excessive transistor capacity.
2Loss of energy
If light-emitting elements are connected in series, then the voltage-dividing efficiency can be improved, but the transistor capacity required increases
Solution Approach 1:
The electrode structure is divided into multiple branches that create parallel current paths. This segmentation allows the light-emitting elements to be connected in series for improved voltage-dividing efficiency, while the parallel branch structure distributes the current load, thereby reducing the required transistor capacity compared to a simple series connection.
Solution Approach 2:
The electrode configuration transitions from a single-dimensional linear connection to a multi-dimensional branched structure. By adding the third electrode branch and creating multiple parallel paths, the system achieves both series connection benefits (voltage division) and parallel connection benefits (current distribution), effectively resolving the transistor capacity requirement issue.
3Ease of manufacture
If a simple electrode structure is used, then the manufacturing process is simple, but the voltage-dividing efficiency and power delivery are insufficient
Solution Approach 1:
The electrode structure is segmented into multiple branches (first, second, and third electrode branches) that can be fabricated using standard photolithography and deposition processes. This segmented design improves voltage-dividing efficiency and power delivery by creating multiple current paths, while still maintaining ease of manufacture through conventional fabrication techniques.
Solution Approach 2:
The electrode design transitions from a simple linear structure to a multi-dimensional branched configuration. This dimensional enhancement improves power delivery efficiency and voltage division without requiring complex fabrication processes, as the branched structure can be implemented using standard multi-layer electrode deposition and patterning techniques.
Data Source
AI summary
A display device includes a first electrode stem and a second electrode stem extended in a first direction and spaced from each other, a first electrode branch branching off from the first electrode stem and extended in a second direction, a second electrode branch branching off from the second electrode stem and extended in the second direction, a third electrode between the first electrode branch and the second electrode branch and one or more light-emitting elements between the first electrode branch and the third electrode and between the third electrode and the second electrode branch, wherein the third electrode is extended in the second direction, and both ends of the third electrode in the second direction are spaced from the first electrode stem and from the second electrode stem, respectively.