Sub-Electrode Layout for Light Emitting Element Alignment
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Solution Overview
Problem
Existing display devices face challenges in achieving improved luminance and alignment of light emitting elements, which affect their performance and efficiency.
Innovation Solution
The display device incorporates a sub-electrode design with protrusions and a bank structure that enhances the alignment of light emitting elements, utilizing electrical signals to align and position them accurately, thereby improving luminance and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional flat sub-electrode design is used, then the manufacturing process is simple, but the alignment of light emitting elements is poor and luminance is reduced
Solution Approach 1:
The sub-electrode is designed with protrusions at specific locations where light emitting elements should be positioned. These protrusions create localized electric field enhancements that improve alignment precision without requiring the entire electrode structure to be complex. The protrusions are strategically placed to correspond with desired element positions, providing localized quality enhancement.
Solution Approach 2:
The sub-electrode transitions from a two-dimensional flat surface to a three-dimensional structure with protrusions. This dimensional change creates vertical electric field components that enhance the alignment mechanism, allowing for more precise positioning of light emitting elements through the additional vertical field component generated by the protruding structures.
2Manufacturing precision
If the sub-electrode protrusions are positioned to overlap with alignment electrodes, then alignment is improved, but electrical short circuits may occur
Solution Approach 1:
An insulating layer is introduced as an intermediary between the sub-electrode protrusions and the alignment electrodes. This intermediate layer maintains the beneficial electric field alignment effects of the protrusions while preventing direct electrical contact that would cause short circuits. The insulating layer acts as a mediator that allows the alignment function to persist without the harmful electrical connection.
3Manufacturing precision
If uniform electric field is applied across the substrate, then the manufacturing process is simple, but light emitting elements do not align properly
Solution Approach 1:
Instead of applying uniform electric field enhancement across the entire substrate, protrusions are placed only at specific locations where light emitting elements should be positioned. This localized approach creates concentrated electric field enhancements exactly where needed, improving alignment precision without requiring complex global field control mechanisms.
Solution Approach 2:
The electric field control is segmented into discrete locations through the protrusion structure. Rather than attempting to control the entire electric field distribution uniformly, the system divides the substrate into multiple regions, with protrusions creating localized field enhancements at specific segments corresponding to desired element positions.
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 results in enhanced luminance and improved alignment of light emitting elements, ensuring uniform light emission and preventing local alignment issues, leading to a more efficient display device.
Implementation Method 1
a sub-electrode disposed on the substrate, and including a first sub-electrode and a second sub-electrode spaced apart from each other
Data Source
AI summary
A display device includes an alignment electrode disposed on a substrate and including a first electrode and a second electrode spaced apart from each other, a light emitting element disposed on the first electrode and the second electrode, and a sub-electrode disposed on the substrate, and including a first sub-electrode and a second sub-electrode spaced apart from each other. The sub-electrode may include a base part and a protrusion protruding from the base part in a plan view.