Subpixel Electrode Layout for High-Resolution Short-Circuit Isolation
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Solution Overview
Problem
Existing display devices face challenges in preventing short circuits between electrodes and maximizing emission area per pixel, particularly in high-resolution displays where the density of electrodes increases, leading to potential electrical shorts and reduced efficiency.
Innovation Solution
The display device incorporates a unique electrode structure with alternating first and second type subpixels, featuring electrode stem portions and protrusions that allow for efficient light emission while preventing short circuits by ensuring that electrodes are spaced apart and connected in a manner that allows for separate power supply voltages to be applied to each end of the light emitting elements, thereby optimizing the emission area and reducing the risk of electrical shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the density of electrodes is increased to achieve high-resolution display, then the resolution is improved, but the risk of short circuits between electrodes increases
Solution Approach 1:
The electrode structure is segmented into stem portions and protrusion portions, with insulating regions positioned between adjacent electrodes. This segmentation allows electrodes to be closely spaced for high resolution while maintaining electrical isolation through the insulating regions, preventing short circuits even at high electrode densities
Solution Approach 2:
An insulating region acts as an intermediary element positioned between adjacent electrodes. This intermediary structure provides electrical isolation between closely spaced electrodes, enabling high-resolution displays without increasing the risk of short circuits between neighboring electrodes
2Area of stationary object
If the number of electrodes is increased to maximize emission area, then the emission area per pixel is improved, but the device complexity increases
Solution Approach 1:
Each electrode combines multiple functional portions (stem portion and protrusion portion) into a single integrated structure. This merging allows each electrode to serve multiple purposes: providing electrical connection through the stem, creating emission regions at protrusions, and maintaining isolation via insulating regions, thereby maximizing emission area without proportionally increasing the number of electrodes
Solution Approach 2:
The electrode structure is designed with multi-functionality, where each electrode serves as both a conductive element for electrical connection and as a structural element that defines emission regions. The protrusion portions create multiple emission areas per electrode, allowing one electrode to generate multiple light-emitting zones, thus maximizing emission area without increasing electrode count
Data Source
AI summary
A display device includes subpixels comprising a plurality of first type subpixels and a plurality of second type subpixels, a plurality of electrodes, each comprising an electrode stem portion and at least one electrode protrusion portion, a plurality of light emitting elements having a shape of extending in one direction and disposed on the electrode stem portion of the one electrode and the electrode protrusion portion of the other electrode, and a plurality of first contact electrodes contacting a first end of the light emitting elements and a plurality of second contact electrodes contacting a second end of the light emitting elements, wherein the light emitting elements comprise first type light emitting elements and second type light emitting elements, and the first ends of the first type light emitting elements and the second type light emitting elements face in opposite directions.