Separate Rollers for Rollable Display and Window Reliability
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Solution Overview
Problem
Rollable display devices face reliability issues due to stress-related buckling and cracking during the rolling process, which affects their portability and durability.
Innovation Solution
A rollable display device design featuring a display module with elastic layers and a window member protected by a hard coating, along with distinct rotary members for rolling up the display and window components, maintains a gap between them to reduce shear stress and prevent buckling and cracking, enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the display module and window member are rolled up together on a single rotary member, then the device structure is simplified, but stress concentration causes buckling and cracking reducing reliability
Solution Approach 1:
The patent divides the rolling mechanism into two independent rotary members: a first rotary member for rolling the display module and a second rotary member for rolling the window member. This segmentation allows each component to be rolled independently, preventing stress concentration and buckling that would occur if they were rolled together on a single rotary member, thereby resolving the contradiction between structural simplicity and reliability.
2Adaptability or versatility
If the display module is made flexible for portability, then portability is improved, but the module becomes more susceptible to stress-induced damage
Solution Approach 1:
The patent introduces elastic layers between the display panel and touch sensing unit, and between the display panel and backlight unit. These elastic layers serve as cushioning elements that absorb and distribute stress during the rolling process, protecting the flexible display module from stress-induced damage while maintaining its portability benefits.
3Weight of moving object
If the window member is made thin and lightweight for portability, then portability is improved, but the window member becomes more vulnerable to cracking
Solution Approach 1:
The patent employs a composite window member structure consisting of a thin plastic film substrate combined with a hard coating layer. This composite structure maintains the lightweight and portable characteristics of the thin window member while the hard coating layer provides enhanced crack resistance and durability, resolving the contradiction between weight reduction and strength.
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 design effectively reduces the probability of buckling and cracking, improving the reliability and portability of rollable display devices by distributing stress and maintaining a gap between the display and window components.
Implementation Method 1
a first elastic layer disposed on the touch sensing unit and a second elastic layer disposed under the display panel
Data Source
AI summary
A rollable display device includes a display module, a window member, a housing in which the display module and the window member are configured to be rolled up and stored, the housing having a slot through which the display module and the window member are configured to move in and out, a first rotary member disposed inside the housing configured to roll up the display module, and a second rotary member disposed inside the housing, spaced from the first rotary member, and configured to roll up the window member.