Flexible Substrate Bonding Apparatus Low-Temperature Process
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Solution Overview
Problem
The manufacturing of flexible displays, such as OLEDs, faces challenges in bonding and debonding flexible substrates due to their thinness and fragility, requiring high temperatures and specialized processes that are difficult to manage effectively with existing technologies.
Innovation Solution
A flexible substrate bonding and debonding apparatus that includes a chamber with a lower and upper chuck, each equipped with heating units and a pressurizing unit, allowing for simultaneous heat treatment and pressure application to bond the substrate pairs at low temperatures, and a separating unit for debonding, using coil-shaped hot wires or halogen lamps for heating and a metal-blade or metallic wire separator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high temperature bonding process is used to bond flexible substrate to support substrate, then bonding strength is improved, but flexible substrate may be damaged due to heat sensitivity
Solution Approach 1:
The patent changes the bonding parameters from high temperature to low temperature process. The heating units are configured to heat the support substrate and flexible substrate to a bonding temperature that is sufficiently low to prevent damage to the flexible substrate while still achieving adequate bonding strength between the substrates.
Solution Approach 2:
The patent introduces a support substrate as an intermediary carrier that can withstand the bonding process conditions. The support substrate serves as a mediator that allows the flexible substrate to be bonded without direct exposure to harmful conditions, protecting the flexible substrate from damage while enabling the bonding process to proceed.
2Device complexity
If conventional bonding apparatus is used, then device simplicity is maintained, but bonding and debonding of flexible substrates cannot be effectively performed
Solution Approach 1:
The patent merges the bonding and debonding functions into a single integrated apparatus. The bonding apparatus includes heating units for bonding and a separating unit for debonding, combining multiple functions in one system. This allows both bonding and debonding operations to be performed reliably without requiring separate specialized equipment, thus maintaining relative simplicity while achieving effective bonding and debonding of flexible substrates.
Solution Approach 2:
The bonding apparatus is designed with multi-functionality to handle both bonding and debonding operations. The heating units can provide controlled heating for bonding, while the separating unit enables debonding when needed. This universal design allows the same apparatus to perform multiple functions reliably, eliminating the need for separate specialized equipment.
3Stability of the object's composition
If flexible substrate is made thinner to improve flexibility, then flexibility is improved, but substrate strength and handling difficulty worsen
Solution Approach 1:
The support substrate acts as an intermediary that compensates for the reduced strength of the thinner flexible substrate. During bonding and handling, the support substrate provides the necessary mechanical strength and stability, allowing the flexible substrate to be made thinner for improved flexibility without compromising overall substrate strength or handling capability.
Solution Approach 2:
The patent changes the operational parameters to accommodate thinner substrates by using low temperature bonding. This prevents thermal damage to the thinner, more flexible substrate while still achieving adequate bonding strength, thus allowing the substrate to be made thinner without sacrificing reliability.
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
Enables reliable bonding and debonding of flexible substrates at low temperatures, enhancing the bonding density and flexibility of the substrates, thereby improving the manufacturing process efficiency and product quality of flexible displays like OLEDs.
Implementation Method 1
a bonding apparatus that includes a heating unit and a pressurizing unit for bonding a support substrate to a flexible substrate
Implementation Method 2
a lower chuck disposed in a lower portion of the chamber and having a lower heating unit and a cooling conduit built therein
Implementation Method 3
a pressurizing unit disposed above the upper chuck
Data Source
AI summary
A flexible substrate bonding and debonding apparatus is disclosed. In one embodiment, the apparatus includes i) a chamber, ii) a lower chuck disposed in a lower portion of the chamber and having a lower heating unit and a cooling conduit built therein, iii) an upper chuck disposed above the lower chuck and having an upper heating unit built therein, iv) a pressurizing unit disposed above the upper chuck and v) a separating unit corresponding to either side of bonding surfaces of a support substrate and a flexible substrate which are disposed between the lower chuck and the upper chuck. The flexible substrate bonding and debonding apparatus can pressurize the flexible substrate and the support substrate simultaneously using a heat-treatment process. Therefore, the flexible substrate can be more reliably bonded and debonded even at low temperature.