LED Bonding Electrode Layer for Stable Chip Attachment
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Solution Overview
Problem
Existing display devices face challenges in achieving improved luminance, lifetime, and yield of light emitting diodes (LEDs) due to inadequate bonding between semiconductor layers and electrodes, leading to instability and reduced performance.
Innovation Solution
The use of a bonding electrode layer made from metals with a melting point of 300°C or lower, such as fusible alloys and eutectic alloys, to securely attach semiconductor chips, ensuring direct contact and stable electrical coupling between semiconductor layers and electrodes, thereby enhancing the bonding force and electrical stability of LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bonding methods are used to attach semiconductor chips to electrodes, then the manufacturing process is simple, but the bonding force is insufficient leading to poor electrical stability and reduced device lifetime
Solution Approach 1:
The patent introduces a bonding electrode layer as an intermediary component between the semiconductor chip and the electrode. This bonding electrode layer, made of low-melting-point materials, acts as a mediator that enhances bonding strength and electrical stability without requiring complex manufacturing processes. The intermediary layer resolves the contradiction by providing improved reliability while maintaining manufacturing simplicity.
Solution Approach 2:
The patent employs composite material structures by combining the semiconductor chip with a bonding electrode layer made of specific low-melting-point materials. This composite approach creates a multi-layer structure that leverages the advantages of different materials to achieve superior bonding force and electrical stability, thereby improving reliability without significantly increasing device complexity.
2Productivity
If conventional electrode materials are used, then the manufacturing process is straightforward, but the bonding force is weak leading to reduced luminance and yield
Solution Approach 1:
The patent changes the material parameter of the bonding electrode by selecting materials with low melting points (300°C or lower). This parameter change enables the bonding electrode to be formed through simple heating processes, maintaining ease of manufacture while significantly improving bonding force, luminance, and yield. The parameter change resolves the contradiction by achieving high productivity without increasing manufacturing complexity.
Solution Approach 2:
The patent utilizes phase transitions of low-melting-point materials in the bonding electrode layer. During manufacturing, these materials undergo melting and solidification phase transitions to form strong bonds between the semiconductor chip and electrode. This phase transition mechanism enables effective bonding through simple thermal processing, thereby improving yield while keeping the manufacturing process straightforward.
3Reliability
If strong bonding is achieved through complex processes, then electrical stability improves, but the manufacturing cost and process complexity increase
Solution Approach 1:
The patent employs a bonding electrode layer made of inexpensive low-melting-point materials that can be easily processed and discarded if necessary. This approach achieves strong bonding through simple thermal processing without requiring complex manufacturing steps, thereby improving reliability while maintaining process simplicity and reducing manufacturing costs.
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 improves the luminance, lifetime, and yield of LEDs by ensuring robust bonding and stable electrical connections, resulting in enhanced performance of display devices.
Implementation Method 1
The bonding electrode layer may include at least one selected from a metal having a melting point of about 300° C. or lower, a fusible alloy, an eutectic alloy, and a soldering metal to mount a semiconductor chip
Data Source
AI summary
A light emitting diode includes: a first semiconductor layer; an active layer located on one surface of the first semiconductor layer; a second semiconductor layer located on one surface of the active layer; an electrode layer located on one surface of the second semiconductor layer; and a bonding electrode layer located on the other surface of the first semiconductor layer.