LED Transfer Head Bonding for Thermal Misalignment Control
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Solution Overview
Problem
Existing light-emitting diode display devices face challenges in manufacturing efficiency and display quality, leading to high production costs and suboptimal performance.
Innovation Solution
A method for manufacturing display devices involves transferring light-emitting units to a transfer head, applying an adhesive layer, and bonding them to a substrate while controlling thermal expansion coefficients to minimize misalignment, using a laser-light attachment process to secure the units onto the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light-emitting units are transferred to a transfer head and bonded to a substrate, then manufacturing precision and alignment are improved, but thermal expansion mismatch causes misalignment during the bonding process
Solution Approach 1:
The patent applies parameter changes by controlling the temperature of the transfer head and substrate to specific ranges during the bonding process. By adjusting temperature parameters, the patent compensates for thermal expansion differences between materials, maintaining alignment precision without requiring complex thermal management systems. The bonding is performed when the transfer head and substrate are at controlled temperatures that minimize differential thermal expansion.
2Productivity
If mass production methods are used to increase manufacturing efficiency, then productivity is improved, but alignment precision and display quality deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-transferring light-emitting units to a transfer head before final bonding to the substrate. This intermediate step allows for preliminary positioning and alignment adjustments. The transfer head serves as a temporary carrier that enables precise placement of multiple light-emitting units onto the substrate in a systematic manner, combining mass production efficiency with alignment precision.
Solution Approach 2:
The transfer head acts as an intermediary between the light-emitting units and the final substrate. This intermediate component facilitates mass production by enabling systematic handling and positioning of multiple units while maintaining alignment precision through controlled bonding conditions. The intermediary transfer head allows for efficient transfer processes without sacrificing the precision required for high-quality display manufacturing.
3Manufacturing precision
If conventional bonding processes are used without thermal control, then device complexity is reduced, but manufacturing precision and yield deteriorate due to thermal expansion mismatch
Solution Approach 1:
The patent implements parameter changes by establishing specific temperature ranges for the transfer head and substrate during bonding. Rather than using complex active thermal control systems, the patent controls temperature parameters within ranges that naturally minimize thermal expansion differences. This approach achieves high bonding precision while keeping the process control relatively simple, as it relies on controlled parameter ranges rather than complex feedback systems.
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 method enhances the yield and quality of light-emitting diode display devices by ensuring precise alignment and attachment of light-emitting units, thereby reducing production costs and improving display performance.
Implementation Method 1
forming an adhesive layer on a transfer head. In addition, the method also includes attaching the plurality of light-emitting units to the adhesive layer
Implementation Method 2
applying a laser-light to at least one of the light-emitting units so that the at least one of the light-emitting units projected by the laser-light on the transfer head is attached to the substrate
Implementation Method 3
the transfer head and the substrate satisfy the following equation during the bonding process: wherein A(T) is the coefficient of thermal expansion of the transfer head, E(T) is the coefficient of thermal expansion of the substrate
Data Source
AI summary
Methods for manufacturing a display device are provided. The methods include providing a plurality of light-emitting units and a substrate. The methods also include transferring the light-emitting units to a transfer head. The methods further include attaching at least one of the plurality of light-emitting units on the transfer head to the substrate by a bonding process, wherein the transfer head and the substrate satisfy the following equation during the bonding process:0≦∫T1T2A(T)dT-∫T1T3E(T)dT<0.01wherein A(T) is the coefficient of thermal expansion of the transfer head, E(T) is the coefficient of thermal expansion of the substrate, T1 is room temperature, T2 is the temperature of the transfer head, and T3 is the temperature of the substrate.