Rollable Display Cover Plate for Flexible, Crack-Resistant Scrolling
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Solution Overview
Problem
Existing scrollable display apparatuses face issues such as cracking and fracturing of encapsulation and touch layers due to bending stress during scrolling, leading to display and touch abnormalities, and poor mechanical properties like low ball and pen drop heights and arching.
Innovation Solution
A flexible display panel design with a cover plate thickness of 60-240 microns and tensile modulus of 3-7 GPa, positioned to align with the neutral layer of the display panel, reducing strain on critical layers and enhancing mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cover plate thickness is increased to improve mechanical strength, then ball and pen drop heights increase, but the display panel becomes more rigid and less flexible
Solution Approach 1:
The patent optimizes the cover plate thickness parameter to a specific range (60-240 microns) and controls the tensile modulus (3-7 GPa) to achieve the right balance between flexibility and strength. This parameter optimization allows the display panel to be sufficiently strong to prevent cracking while remaining flexible enough for scrolling operations.
Solution Approach 2:
The patent employs a composite structure consisting of multiple layers including the cover plate, bonding layer, display base substrate, back film, spacer layer, and support member. Each layer contributes different mechanical properties, creating a composite material system that simultaneously achieves both flexibility and strength, resolving the contradiction between these two properties.
2Stability of the object's composition
If the cover plate thickness is increased to reduce arching, then mechanical properties improve, but manufacturing complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for cover plate thickness (60-240 microns) and tensile modulus (3-7 GPa) to control arching. By optimizing these parameters, the display panel achieves stable composition during scrolling without requiring overly complex manufacturing processes.
Solution Approach 2:
The bonding layer acts as an intermediary between the cover plate and the display base substrate, facilitating their integration. This intermediary layer simplifies the manufacturing process while still achieving the desired mechanical stability and arching reduction through proper thickness and material selection.
3Reliability
If the cover plate is positioned to align with the neutral layer to reduce strain on encapsulation and touch layers, then reliability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the cover plate thickness parameter to align with the neutral layer position, which naturally reduces strain on the encapsulation and touch layers during bending. This parameter-based approach improves reliability while keeping manufacturing precision requirements manageable through standard fabrication tolerances.
Solution Approach 2:
The cover plate is pre-positioned during manufacturing to align with the neutral layer before the display panel is fully assembled and put into service. This preliminary positioning ensures that when the panel is later bent during scrolling, the critical layers experience minimal strain, improving reliability without requiring high-precision adjustments during final assembly.
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
Reduces strain on encapsulation and touch layers by 23-26%, increases ball and pen drop heights by 25-100%, and decreases arching by 19-21%, ensuring reliable display and touch functionality.
Implementation Method 1
A flexible display panel design with a cover plate thickness of 60-240 microns and tensile modulus of 3-7 GPa, positioned to align with the neutral layer of the display panel, reducing strain on critical layers
Implementation Method 2
reduces strain on encapsulation and touch layers by 23-26%
Implementation Method 3
a first bonding layer, provided on a side of the display base substrate away from the support member
Data Source
AI summary
A scrollable display apparatus includes a flexible display panel including a fixing region, a scrollable region, and a force application region sequentially connected, the flexible display panel includes: a support member; a spacer layer on a side of the support member; a back film on a side of the spacer layer away from the support member; a display base substrate on a side of the back film away from the support member; a first bonding layer on a side of the display base substrate away from the support member; a cover plate on a side of the first bonding layer away from the support member, a thickness of the cover plate is not less than 60 microns and not more than 240 microns, a tensile modulus of the cover plate is not less than 3 GPa and not more than 7 GPa.