Sub-Pixel Alignment Electrodes for Accurate Light Emitter Placement
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Solution Overview
Problem
Display devices face issues with light emitting efficiency due to parasitic electric fields distorting the electric field between alignment electrodes, leading to misalignment of light emitting elements.
Innovation Solution
A display device design with separate alignment electrodes for each sub-pixel and an insulating layer with openings to concentrate the electric field, minimizing parasitic field effects and ensuring accurate alignment of light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate alignment electrodes are used for each sub-pixel, then light emitting efficiency is improved through accurate alignment, but device complexity increases
Solution Approach 1:
The alignment electrode structure is segmented into multiple independent electrodes (first alignment electrode, second alignment electrode, third alignment electrode) corresponding to different sub-pixels. Each electrode can be independently controlled to generate alignment electric fields, enabling precise alignment of light emitting elements in each sub-pixel region while maintaining overall system functionality.
Solution Approach 2:
Different alignment electrodes are assigned different alignment signals (first alignment signal, second alignment signal, third alignment signal) with specific voltage levels and phases tailored to local requirements. This allows optimization of alignment electric field distribution in each sub-pixel region, improving alignment accuracy without uniformly increasing complexity across the entire device.
2Reliability
If insulating layer with openings is introduced to concentrate electric field, then light emitting efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The insulating layer is segmented with multiple openings (first openings, second openings, third openings) distributed across different regions. Each opening corresponds to specific sub-pixel areas and allows concentration of alignment electric fields at targeted locations, improving light emitting efficiency while maintaining manufacturability through standardized patterning processes.
Solution Approach 2:
The insulating layer with openings acts as an intermediary structure between the alignment electrodes and the light emitting elements. It concentrates and directs the alignment electric fields through the openings to specific regions, enhancing field concentration effect without requiring direct modification of the electrode structures themselves, thus simplifying manufacturing.
3Manufacturing precision
If alignment electrodes cover entire emission areas, then alignment coverage is improved, but parasitic electric field effects worsen
Solution Approach 1:
The alignment electrode coverage is segmented into multiple discrete electrodes rather than continuous coverage. This segmentation interrupts the formation of large-scale parasitic electric fields while maintaining sufficient alignment coverage in each local region, reducing electric field distortion effects.
Solution Approach 2:
The insulating layer with openings extracts and isolates the alignment electric field generation to specific regions. By removing insulating material only in designated opening areas, the patent enables concentrated field generation where needed while preventing parasitic field formation in other areas, thus reducing overall electric field distortion.
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
This approach enhances light emitting efficiency by reducing misalignment and concentrating the electric field within specific openings, leading to improved reliability and performance of the display device.
Implementation Method 1
an electric field formed between alignment electrodes may be distorted by the parasitic electric field
Implementation Method 2
an insulating layer with openings to concentrate the electric field, minimizing parasitic field effects and ensuring accurate alignment of light emitting elements
Data Source
AI summary
According to one or more embodiments of the present disclosure, a display device may include a substrate including a first emission area and a second emission area spaced from the first emission area in a first direction, a bank partitioning the first emission area and the second emission area, a first alignment electrode covering the first emission area in a plan view, a second alignment electrode spaced from the second alignment electrode and covering the second emission area in a plan view, first light emitting elements on the first alignment electrode, and second light emitting elements on the second alignment electrode.