Display Device Series-Connected Mini-Subpixels
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Solution Overview
Problem
Display devices face challenges with reduced light emission failure and improved luminance per unit area, particularly in subpixels, where existing technologies struggle to maintain high luminance while minimizing light emission failures.
Innovation Solution
The display device incorporates a specific electrode configuration with contact electrodes and an electrode connection portion, allowing light emitting elements to be connected in series, enhancing luminance and reducing light emission failures even in small subpixel areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are connected in parallel in existing subpixels, then the subpixel area can be kept small, but the luminance per unit area is insufficient and light emission failure rate increases
Solution Approach 1:
The invention divides each subpixel into multiple mini-subpixels, and each mini-subpixel contains multiple light emitting elements connected in series. This segmentation allows the light emitting elements to share current paths, reducing the failure rate while maintaining high luminance density in the limited subpixel area.
Solution Approach 2:
The invention introduces a new spatial dimension by creating multiple mini-subpixels within each subpixel and arranging contact electrodes in specific patterns (first, second, third, and fourth contact electrodes). This dimensional reorganization enables series connection of light emitting elements without increasing the overall subpixel area, thereby improving luminance per unit area while reducing failure rates through redundant current paths.
2Illumination intensity
If series connection is implemented in existing technologies, then luminance can be improved, but the subpixel area becomes too large to maintain high pixel density
Solution Approach 1:
By segmenting each subpixel into multiple mini-subpixels with shared current paths, the invention achieves series connection benefits (high luminance) while containing the total area within the original subpixel boundaries. The segmented structure allows efficient space utilization.
Solution Approach 2:
The contact electrodes serve multiple functions: they contact light emitting elements in different mini-subpixels, provide current paths for series connection, and define the boundaries of mini-subpixels. This multi-functionality enables series connection without proportionally increasing the number of electrode elements or overall area.
3Illumination intensity
If more contact electrodes are added to connect light emitting elements, then series connection and luminance improve, but the electrode complexity and manufacturing difficulty increase
Solution Approach 1:
The invention uses an asymmetric arrangement of contact electrodes (first, second, third, and fourth contact electrodes positioned at different locations) to efficiently connect light emitting elements in series. This asymmetric but optimized layout reduces the number of required electrodes compared to symmetric designs, simplifying manufacturing while achieving the desired series connection.
Solution Approach 2:
By segmenting the electrode structure into dedicated first, second, third, and fourth contact electrodes with specific functions, the invention makes the complex electrode configuration more manageable and manufacturable. Each electrode segment has a defined role, reducing overall system complexity.
Data Source
AI summary
Provided is a display device. The display device comprises: a first substrate; a first electrode and a second electrode arranged spaced apart from each other on the first substrate; a plurality of light-emitting diodes arranged on the first electrode and the second electrode; a plurality of contact electrodes arranged on the first electrode or the second electrode and being in contact with the light-emitting diodes, wherein the contact electrodes comprise a first contact electrode arranged on the first electrode, a second contact electrode arranged on the second electrode, a third contact electrode facing the first contact electrode in a second direction, and a fourth contact electrode facing the second contact electrode in the second direction, and include an electrode connection unit connected to the third contact electrode and the fourth contact electrode and arranged to surround the second contact electrode.