Display Device Electrode Configuration for Light Emission Efficiency
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Solution Overview
Problem
Current display devices face challenges in enhancing light emission efficiency while preventing short defects between electrode configurations, which affect the reliability and performance of the display.
Innovation Solution
The display device incorporates a specific electrode configuration with a first and second electrode disposed on a substrate, along with a third electrode electrically connected to the second electrode, where the third electrode is positioned between the first and second electrodes, and includes a light emitting element with a first semiconductor layer, a second semiconductor layer, and an active layer. This configuration improves light emission efficiency and prevents short defects by optimizing the alignment and spacing of electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the distance between the first electrode and the second electrode is reduced to improve light emission efficiency, then light emission efficiency is improved, but the risk of short defects between electrodes increases
Solution Approach 1:
The electrode configuration is segmented into three separate electrodes (first electrode, second electrode, and third electrode) rather than using only two electrodes. The third electrode is disposed between the first and second electrodes, creating distinct electrical zones that prevent direct contact between the first and second electrodes while maintaining efficient light emission through the segmented structure.
Solution Approach 2:
The third electrode serves as an intermediary element between the first electrode and the second electrode. It is electrically connected to the second electrode and positioned between the first and second electrodes, acting as a mediator that maintains electrical connection while preventing direct contact that would cause short defects, thus enabling reduced spacing without compromising reliability.
2Reliability
If a third electrode is added between the first and second electrodes to prevent short defects, then reliability is improved, but device complexity increases
Solution Approach 1:
The third electrode performs multiple functions simultaneously: it is electrically connected to the second electrode to maintain electrical continuity, positioned between the first and second electrodes to prevent short defects, and enables reduced spacing between electrodes to improve light emission efficiency. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The third electrode merges several protective and functional roles into a single element. It combines the functions of electrical connection (to the second electrode), physical separation (preventing short defects between first and second electrodes), and light emission enhancement (enabling reduced electrode spacing), thereby reducing overall device complexity despite adding an electrode.
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 effectively enhances light emission efficiency and prevents short defects between electrode configurations, leading to improved electrical reliability and performance of the display device.
Implementation Method 1
providing an ink including a solvent and a light emitting element dispersed in the solvent; and forming an electric field between the first electrode and the second electrode
Data Source
AI summary
A display device includes a first electrode and a second electrode disposed on a substrate, at least one light emitting element including a first semiconductor layer including a semiconductor of a first type, a second semiconductor layer including a semiconductor of a second type different from the first type, and an active layer disposed between the first semiconductor layer and the second semiconductor layer, and a third electrode disposed on the substrate and electrically connected to the second electrode. At least a portion of the third electrode is disposed between the first electrode and the second electrode in a plan view.