Flexible Display Substrate Stiffener for Thermal Deformation Control
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Solution Overview
Problem
Flexible display apparatuses face challenges with thermal deformation due to unpredictable expansion and contraction of their substrates during manufacturing processes, affecting workability and yield, especially in bonding processes.
Innovation Solution
A flexible display apparatus is designed with a stiffener featuring patterned reinforcement lines that reduce thermal deformation by minimizing expansion and contraction, allowing easier connection of circuit terminals to pads on the substrate, using materials with lower thermal expansion coefficients than the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible substrate is used to enable flexible display apparatus, then flexibility and adaptability are improved, but thermal deformation and manufacturing precision deteriorate due to unpredictable expansion and contraction during heating processes
Solution Approach 1:
The stiffener is divided into multiple reinforcement lines that are patterned separately across the substrate. These segmented reinforcement lines collectively provide thermal stability while maintaining overall substrate flexibility, allowing the substrate to expand and contract in a controlled manner during heating processes without causing unpredictable thermal deformation
Solution Approach 2:
The reinforcement lines are strategically positioned in specific regions of the substrate where thermal expansion and contraction are most problematic. By concentrating stiffening properties in these local areas rather than uniformly across the entire substrate, the invention maintains flexibility in non-critical regions while providing thermal stability where needed for manufacturing precision
2Strength
If the substrate is heated during bonding process, then bonding strength is improved, but substrate expansion and contraction increase causing workability and yield to deteriorate
Solution Approach 1:
The reinforcement lines are pre-installed on the substrate before the bonding process. These reinforcement lines act as a preventive measure that cushions against thermal expansion and contraction during subsequent heating and bonding operations, thereby maintaining workability and yield while still allowing sufficient bonding strength to be achieved
3Adaptability or versatility
If the substrate thickness is reduced to improve flexibility, then adaptability is improved, but structural stability and resistance to thermal deformation deteriorate
Solution Approach 1:
The invention creates a composite structure by combining the flexible substrate with the stiffener comprising multiple reinforcement lines. This composite construction allows the thin flexible substrate to maintain its flexibility while the integrated reinforcement lines provide the necessary structural stability and resistance to thermal deformation that would otherwise be lost due to reduced thickness
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 effectively maintains flexibility and reduces thermal deformation, enhancing the workability and yield of manufacturing processes by stabilizing the substrate during bonding and connection of circuit terminals.
Implementation Method 1
the substrate may be subject to expansion by heat or contraction. In addition, a position at which the substrate of the flexible display device expands or contracts is not easily predicted. Thus, the workability and yield of a subsequent process of heating the substrate
Data Source
AI summary
A flexible display apparatus is disclosed. The flexible display apparatus includes: a substrate on which a display unit for displaying an image, a non-display area formed outside the display unit, and at least one pad for inputting an electrical signal to the display unit are located; and a circuit board including circuit terminals to be electrically connected to the at least one pad. A stiffener including a plurality of reinforcement lines that are patterned to reduce or prevent thermal deformation of the substrate is formed on the substrate.