Display Device Electrode Alignment via Bank Overlap
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in preventing misalignment of light emitting elements, particularly due to unwanted electric fields generated between electrodes, which can cause light emitting elements to be placed at incorrect positions.
Innovation Solution
The display device incorporates a configuration with second electrodes that have a widened electrode portion covering adjacent subpixels, overlapping the bank layer, to prevent misalignment by ensuring electric fields are only generated between the bank patterns, thereby aligning light emitting elements correctly between the first and second electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrodes are disposed to extend across subpixel boundaries, then light emitting element alignment is improved, but unwanted electric fields are generated causing misalignment
Solution Approach 1:
The electrode structure is segmented into first electrodes disposed within individual subpixels and second electrodes disposed at subpixel boundaries. This segmentation allows each electrode type to serve a specific function: first electrodes for electrical connection within subpixels and second electrodes for defining alignment boundaries between subpixels, thereby preventing unwanted electric fields while maintaining alignment precision
Solution Approach 2:
The second electrodes act as intermediary elements disposed between adjacent subpixels. These intermediate electrodes create defined electric field boundaries that prevent unwanted electric field interactions between subpixels, thereby serving as mediators that enable precise light emitting element placement without causing misalignment
2Manufacturing precision
If second electrodes are widened to cover adjacent subpixels, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The second electrodes serve multiple functions simultaneously: they define alignment boundaries between subpixels, create appropriate electric fields for light emitting element placement, and provide structural reference for the bank layer. This multi-functionality reduces the need for additional alignment structures, thereby managing device complexity while improving alignment precision
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 configuration enhances the alignment and placement of light emitting elements, improving the product quality and manufacturing efficiency by preventing unwanted electric fields from affecting the positioning of light emitting elements.
Implementation Method 1
ensuring electric fields are only generated between the bank patterns, thereby aligning light emitting elements correctly between the first and second electrodes
Data Source
AI summary
A display device includes a bank layer extending in a first direction and a second direction intersecting the first direction and surrounding subpixels; a first electrode extending in the first direction in each of the subpixels; second electrodes spaced apart from the first electrode and extending in the first direction; light emitting elements comprising a first light emitting element disposed on the first electrode and any one of the second electrodes, and a second light emitting element having an end disposed on another one of the second electrodes; a first connection electrode disposed on the first electrode and electrically contacting the first light emitting element; and a second connection electrode disposed on the second electrodes and electrically contacting the second light emitting element, wherein each of the second electrodes is disposed in different ones of the subpixels and overlaps in a plan view the bank layer disposed between the subpixels.