Micro-LED Pixel Structure With Guided Alignment and Light Reflection
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Solution Overview
Problem
Existing technologies face challenges in aligning ultra small light-emitting diodes without causing damage and ensuring efficient light emission towards the front face, particularly when connecting nano or micro-sized LEDs to electrodes.
Innovation Solution
The pixel structure includes a design with separated first and second electrodes at the same level on a base substrate, transparent contact electrodes, and a dam structure to prevent alignment issues, along with guide structures and reflection surfaces to enhance light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ultra small light-emitting diodes are directly connected to electrodes, then device complexity is reduced, but manufacturing precision deteriorates due to difficulty in aligning nano or micro-sized LEDs
Solution Approach 1:
The patent introduces a connection electrode as an intermediary component between the ultra small light-emitting diode and the electrode. This connection electrode includes a first contact electrode that connects to the first electrode and a second contact electrode that connects to the second electrode, providing a mediating structure that facilitates precise alignment and connection of the nano or micro-sized LED to the electrodes without requiring direct connection
2Ease of manufacture
If three dimensional light-emitting elements are placed in upright position, then ease of manufacture is improved, but reliability deteriorates due to difficulty in connecting ultra small LEDs to electrodes
Solution Approach 1:
The patent transitions from a three-dimensional upright placement approach to a two-dimensional planar configuration where the ultra small light-emitting diode is positioned horizontally between the first and second electrodes on the base substrate. This dimensional change allows for more reliable electrical connection while maintaining ease of manufacture, as the planar arrangement facilitates better alignment and contact between the LED and electrodes
3Area of stationary object
If electrode space is reduced, then area efficiency is improved, but manufacturing precision deteriorates due to difficulty in aligning ultra small LEDs
Solution Approach 1:
The patent segments the connection structure into multiple components: a first electrode, a second electrode, and a connection electrode with first and second contact electrodes. This segmentation allows the electrodes to be positioned closer together (reducing overall area) while maintaining precise alignment through the separate contact electrode structure, which can be independently positioned and connected to the ultra small light-emitting diode
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 effectively prevents damage to ultra small light-emitting diodes during alignment and significantly increases light emission efficiency by reflecting light from both ends and sides of the diodes, achieving up to 324% higher efficiency compared to previous methods.
Implementation Method 1
A surface of at least one of the first or second electrodes facing the ultra small light-emitting diode may be a reflection surface that reflects light to be emitted from the ultra small light-emitting diode
Data Source
AI summary
A pixel structure of a display apparatus includes an electrode line, at least one ultra small light-emitting diode, and a connection electrode. The electrode line includes a second electrode separated from a first electrode and at a same level as the first electrode on a base substrate. The at least one ultra small light-emitting diode is on the base substrate and has a length less than a distance between the first and second electrodes. A connection electrode includes a first contact electrode connecting the first electrode to the ultra small light-emitting diode and a second contact electrode connecting the second electrode to the ultra small light-emitting diode.