Light Guide Plate Microstructure Design for Foldable Display Bending
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Solution Overview
Problem
Current light guide plates in foldable display devices are prone to microstructure deformation and debonding from the optical adhesive layer due to bending, leading to light leakage and reduced performance.
Innovation Solution
A light guide plate design with varying microstructure sizes and densities along the bending region, where microstructures are smaller and denser closer to the center, increasing the contact area with the optical adhesive layer and reducing the risk of peeling off, while maintaining light intensity by adjusting size and density distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microstructure is applied in non-foldable design, then light guide function is achieved, but microstructure is squeezed or stretched when folded causing reflection angle change and light leakage
Solution Approach 1:
The patent applies different microstructure sizes at different locations: larger microstructures at the bending region and smaller microstructures at the flat regions. This local differentiation allows the bending region microstructures to better withstand deformation during folding, maintaining light guide function and preventing light leakage.
2Reliability
If microstructure is applied at bending region, then light guide function is maintained, but microstructure detaches from optical adhesive layer at high bending angles
Solution Approach 1:
The patent uses larger microstructures specifically at the bending region where stress concentration occurs during folding. These enlarged microstructures provide greater contact area with the optical adhesive layer, enhancing attachment strength and preventing detachment at high bending angles.
3Strength
If microstructure size is increased at bending region, then contact area with optical adhesive layer is increased, but light intensity may be reduced
Solution Approach 1:
The patent strategically places larger microstructures only at the bending region while maintaining smaller microstructures at the flat regions. This localized size differentiation optimizes the balance between attachment strength at the bending region and overall light intensity distribution across 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 design enhances the attachment force between the microstructure and the optical adhesive layer, reduces light leakage, and minimizes interference and squeeze with the reflective display panel, thereby preventing debonding and maintaining performance when the device is folded.
Implementation Method 1
the reflection angle may be changed such that light leakage may occur
Data Source
AI summary
A display device has two flat regions and a bending region located between the two flat regions. The display device includes a reflective display device, a cover structure, and a light guide plate. The cover structure is located above the reflective display device. The light guide plate is located between the reflective display device and the cover structure. The light guide plate has a microstructure, and the microstructure is located on a top surface of the light guide plate close to the cover structure. The microstructure has a plurality of second microstructures located at the bending region, and the sizes of the second microstructures vary along with the distances between the second microstructures and a center position of the light guide plate.