Flexible LCD Substrate with Barrier Layers to Prevent Warpage
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Solution Overview
Problem
Current liquid crystal display substrates face challenges in achieving a larger screen size while maintaining portability due to warpage issues caused by thermal expansion differences between glass and plastic substrates, which complicates the use of existing LCD production equipment and increases costs for specialized facilities.
Innovation Solution
A substrate for liquid crystal displays is designed with a flexible polymer substrate, featuring first and second barrier layers of different thicknesses or stress strengths, and hard coating layers on both surfaces to prevent warpage and enhance mechanical strength, thereby addressing the thermal expansion challenges and adhesion issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a plastic substrate is used to achieve flexible display with larger screen size, then portability and screen area are improved, but warpage occurs due to thermal expansion difference between plastic and glass substrates
Solution Approach 1:
The patent uses a composite structure combining plastic substrate with glass substrate through adhesive bonding. The glass substrate provides thermal stability while the plastic substrate provides flexibility and large screen area capability. This composite approach resolves the contradiction by combining materials with complementary properties to achieve both large screen size and warpage resistance.
Solution Approach 2:
The patent introduces an adhesive layer as an intermediary between the plastic substrate and glass substrate. This adhesive mediator bonds the two different materials together, allowing them to work together as a unified structure that maintains both flexibility and dimensional stability during manufacturing processes.
2Adaptability or versatility
If plastic substrate is stacked on glass substrate to achieve flexible display, then flexibility and screen area are improved, but thermal expansion coefficient increases making it difficult to apply to existing LCD production equipment
Solution Approach 1:
The patent divides the substrate system into separate functional layers: a plastic substrate layer for flexibility, a glass substrate layer for dimensional stability and equipment compatibility, and an adhesive layer for bonding. This segmentation allows each layer to fulfill its specific function while the overall structure remains compatible with existing LCD production equipment through the glass substrate component.
3Strength
If adhesive is applied to bond plastic substrate to glass substrate, then structural integrity is improved, but warpage phenomenon occurs due to thermal expansion difference
Solution Approach 1:
The patent creates a composite structure where the adhesive bonds plastic and glass substrates together, forming a unified assembly that leverages the complementary properties of both materials. The glass substrate provides thermal stability that compensates for the plastic substrate's thermal expansion, thereby preventing warpage while maintaining strong adhesive bonding.
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 prevents substrate deformation during manufacturing processes, allowing for larger screen sizes without warpage and enabling the use of existing LCD production equipment, thus improving portability and reducing production costs.
Implementation Method 1
the plastic substrate may undergo a warpage phenomenon due to a difference in the thermal expansion coefficient between the glass substrate and the plastic substrate during the manufacturing process
Data Source
AI summary
Provided is a substrate for a liquid crystal display which is resistant to deformation. The substrate includes a flexible substrate, first and second barrier layers respectively disposed on first and second surfaces of the flexible substrate, and first and second hard coating layers respectively disposed on the first and second barrier layers.