Polyimide Cover Plate for Flexible OLED Displays
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Solution Overview
Problem
Existing flexible OLED display screen cover plates have low hardness, impact resistance, and poor light transmittance, making them inadequate for meeting the requirements of flexible displays.
Innovation Solution
A method for preparing a display screen cover plate involves condensing a dianhydride monomer with first and second diamine monomers to obtain a polyamide acid, which is then reacted with a dehydrating agent and catalyst to form a polyimide polymer. This polymer is dissolved, coated onto a substrate, and peeled off to create the cover plate, utilizing a benzene ring structure with a fluorinated group and pyridine structure to enhance mechanical and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a flexible OLED display screen uses a conventional substrate, then the display can be flexible and lightweight, but the hardness and impact resistance are low
Solution Approach 1:
The patent applies composite materials by combining a flexible substrate with a polyimide cover plate. The polyimide material provides high hardness and impact resistance while maintaining flexibility. This composite structure resolves the contradiction by adding a protective layer that enhances strength without compromising the flexible nature of the display.
Solution Approach 2:
The patent uses a thin film polyimide cover plate that is both flexible and strong. The polyimide material is known for its flexibility and high strength-to-weight ratio, allowing the cover plate to bend with the display while providing protection against impacts and external forces.
2Strength
If the cover plate material is made harder to improve impact resistance, then hardness increases, but light transmittance deteriorates
Solution Approach 1:
The patent changes the material parameters by selecting polyimide with specific chemical composition and molecular structure. The polyimide material is formulated to have optimal optical properties, allowing it to maintain high light transmittance while achieving the desired hardness and impact resistance through controlled polymer chain arrangement and cross-linking.
3Strength
If a single material is used for the cover plate, then the structure is simple, but it cannot simultaneously achieve high hardness, high transparency, and flexibility
Solution Approach 1:
The patent uses composite materials by combining a flexible substrate with a polyimide cover plate. The polyimide material provides high hardness and impact resistance while maintaining flexibility. This composite structure resolves the contradiction by adding a protective layer that enhances strength without compromising the flexible nature of the display.
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 resulting cover plate exhibits outstanding hardness, high transparency, and a high modulus, significantly improving impact resistance and providing better protection for the display screen while maintaining good light transmittance.
Implementation Method 1
condensing a dianhydride monomer with a first diamine monomer and a second diamine monomer to obtain a polyamide acid
Implementation Method 2
reacting the polyimide acid with a dehydrating agent and a catalyst to obtain a polyimide polymer
Data Source
AI summary
The present disclosure discloses a method for preparing a display screen cover plate, a display screen cover plate and a display device. The method for preparing a display screen cover plate including: condensing a dianhydride monomer with a first diamine monomer and a second diamine monomer to obtain a polyamide acid; reacting the polyimide acid with a dehydrating agent and a catalyst to obtain a polyimide polymer; dissolving the polyimide polymer in a solvent to obtain a polymer solution; coating the polymer solution onto the substrate to form a film, and peeling off to obtain the display screen cover plate; and the dianhydride monomer having a benzene ring structure and a fluorinated group connected to the benzene ring structure, the first diamine monomer having a pyridine structure, and the second diamine monomer having a benzene ring structure.