Light-Emitting Cell Electrode Layout for Fewer Connection Defects
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Solution Overview
Problem
Existing light-emitting devices face challenges in reducing electrical connection failures while minimizing manufacturing costs and maintaining high resolution, particularly when the width of the light-emitting cells is optimized between 5 μm and 100 μm, leading to increased production costs and defects.
Innovation Solution
The implementation of an extended layer surrounding the light-emitting cell with electrode pads positioned asymmetrically and through-electrodes that increase the interval between electrode connections, allowing for larger electrode pads and reduced overlap, thereby minimizing process errors and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of light-emitting cells is optimized between 5 μm and 100 μm, then manufacturing costs increase and defects increase, but device performance is improved
Solution Approach 1:
The patent extends the electrode pads in the thickness direction (vertical dimension) to create through-electrodes that penetrate the extended layer. This dimensional extension allows electrode pads to be larger in area without increasing horizontal footprint, thereby improving electrical connection reliability and reducing defects while maintaining compatibility with optimized light-emitting cell widths
Solution Approach 2:
The extended layer acts as an intermediary structure between the light-emitting cell and the electrode pads. This intermediate layer provides a platform for forming larger electrode pads and through-electrodes that improve electrical connection without directly modifying the light-emitting cell structure, thus reducing defects while managing manufacturing complexity
2Reliability
If electrode pads are made larger to reduce overlap, then electrical connection failures are reduced, but device area increases
Solution Approach 1:
The electrode pads are extended in the thickness direction to form through-electrodes that penetrate the extended layer. This vertical extension increases the effective electrode pad area for better electrical connection without proportionally increasing the horizontal device footprint, thus improving reliability while controlling overall device area
Solution Approach 2:
The extended layer is positioned specifically around the light-emitting cell with asymmetric electrode pad arrangements. This localized extension provides enhanced electrical connection only where needed (at the electrode interfaces) rather than uniformly increasing the entire device structure, optimizing the balance between connection reliability and device area
3Manufacturing precision
If through-electrodes are used to increase interval between electrode connections, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The extended layer serves as an intermediary structure that simplifies the formation of through-electrodes. By providing a dedicated extended region with controlled material properties, the extended layer facilitates precise electrode alignment and connection while encapsulating the complexity within a standardized structural element
Solution Approach 2:
The extended layer is formed in advance around the light-emitting cell before the electrode pads and through-electrodes are created. This preliminary structural preparation establishes precise geometric boundaries and material interfaces that guide subsequent electrode formation processes, improving alignment precision while managing overall manufacturing complexity
Data Source
AI summary
A light-emitting device and a display apparatus including the light-emitting device are provided. The light-emitting device includes a light-emitting cell including first and second electrodes arranged on an upper surface to be apart from each other, an extended layer in which the light-emitting cell is embedded and which has a width greater than a width of the light-emitting cell, and first and second electrode pads arranged on an upper surface of the extended layer to be apart from each other and respectively electrically connected to the first and second electrode.