Micro LED Debossing Groove Layout for Polarity Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with self-light-emitting elements, such as OLEDs and micro LED displays, face challenges with moisture and oxygen sensitivity, leading to defective pixels and reduced reliability compared to inorganic micro LED displays.
Innovation Solution
A display device design featuring a micro light-emitting element with an electrode at one end, made of magnetic material, aligned within debossing grooves on a substrate, improving luminance and reducing power consumption by using a debossing groove structure with protrusions to enhance alignment and reduce electrode polarity misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If organic material is used for light-emitting layer, then flexibility and thinning are achieved, but moisture and oxygen sensitivity causes defective pixels and reduced reliability
Solution Approach 1:
The patent uses a bottom-emitting micro LED structure where the light-emitting layer is disposed only in the debossing groove area, effectively making the light-emitting region 'disposable' or confined to where it is needed. This reduces the amount of organic material used and limits exposure to moisture and oxygen, thereby improving reliability while maintaining thinness
2Length of moving object
If micro light-emitting elements are used, then device thinning is achieved, but alignment precision and luminance uniformity become challenging
Solution Approach 1:
The debossing groove acts as an intermediary structure that facilitates precise alignment of the micro light-emitting elements. The groove provides a physical guide and constraint that ensures elements are positioned accurately during the dispensing process, thereby improving manufacturing precision while enabling the use of thin micro LED structures
Solution Approach 2:
The debossing groove is formed in advance on the substrate before the light-emitting elements are deposited. This preliminary structural preparation creates predetermined alignment references that guide the subsequent placement of micro LEDs, ensuring high positioning accuracy without requiring complex real-time alignment mechanisms
3Reliability
If electrode is disposed at both ends of light-emitting element, then electrical connection is achieved, but polarity misalignment reduces luminance efficiency
Solution Approach 1:
The patent extracts the electrode from one end of the light-emitting element, creating a bottom-emitting micro LED structure with electrode only at the bottom surface. This eliminates the polarity misalignment issue at the top electrode while maintaining reliable electrical connection through the bottom electrode, thereby improving luminance efficiency
Solution Approach 2:
The light-emitting element structure is made asymmetric by placing the electrode only at the bottom surface rather than at both ends. This asymmetric configuration simplifies the electrical connection scheme and eliminates polarity misalignment problems that would occur with symmetric dual-electrode structures, thereby improving luminance efficiency
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 enhances the luminance and reliability of the display device while reducing power consumption by effectively aligning micro light-emitting elements within debossing grooves, preventing polarity misalignment and improving the overall performance of the display.
Implementation Method 1
a magnetic field may be applied to the plurality of micro light-emitting elements, such that the plurality of micro light-emitting elements are aligned with the plurality of debossing grooves
Data Source
AI summary
A display device includes a base substrate including a display area and a circuit area; a planarization layer disposed on the base substrate; a plurality of debossing grooves defined in the planarization layer and disposed on the display area of the base substrate; at least one light-emitting element aligned with and received in each of the debossing grooves, wherein the light-emitting element includes a first semiconductor layer, an active layer, a second semiconductor layer, and a first electrode contacting the first semiconductor layer; a second electrode line contacting the second semiconductor layer of the light-emitting element; and a first electrode line electrically connected to the first electrode.