Variable Thickness Polarizing Plate for Flexible Display Crack Resistance
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Solution Overview
Problem
Flexible display devices face challenges with impact resistance and display quality due to cracking of polarizing plates during folding and unfolding, leading to inefficient production processes and discarded devices.
Innovation Solution
A flexible display device design featuring a polarizing plate with varying thickness and stretching ratios in folding and non-folding areas, utilizing a polarizing layer and TAC films to prevent cracks and maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the polarizing plate is drawn to maximum stretching ratio, then the display performance is improved, but cracks frequently generate in folding area
Solution Approach 1:
The patent applies different stretching ratios to different regions of the polarizing plate. The non-folding area is stretched to a first stretching ratio (e.g., 6 times or maximum), while the folding area is stretched to a second stretching ratio that is less than the first stretching ratio. This local differentiation allows the non-folding area to achieve optimal display performance while the folding area maintains sufficient flexibility and crack resistance.
2Manufacturing precision
If the polarizing plate is drawn to maximum stretching ratio, then the polarization efficiency is improved, but the impact resistance becomes extremely weak
Solution Approach 1:
The patent implements local quality by applying maximum stretching ratio only to the non-folding area of the polarizing plate, while applying a reduced stretching ratio to the folding area. This ensures that the folding area retains sufficient thickness and strength to resist impact and prevent cracks, while the non-folding area achieves optimal polarization efficiency for display performance.
3Manufacturing precision
If the polarizing plate has cracks, then the display quality degrades, but removing the polarizing plate is difficult
Solution Approach 1:
The patent applies preliminary anti-action by pre-preventing crack formation through differential stretching design before the cracking problem can occur. By stretching the folding area to a lower ratio than the non-folding area, the patent proactively eliminates the stress concentration that would lead to cracks during folding operations, thereby preventing display quality degradation and avoiding the need for difficult plate removal or device discarding.
4Ease of manufacture
If the polarizing plate is stretched uniformly, then the manufacturing process is simple, but cracks generate in folding area
Solution Approach 1:
The patent implements local quality by dividing the polarizing plate into folding and non-folding areas with different stretching ratios. The non-folding area is stretched to a first stretching ratio (e.g., 6 times) while the folding area is stretched to a second stretching ratio (less than the first). This regional differentiation prevents cracks in the folding area while maintaining manufacturing feasibility through a controlled multi-stage stretching process.
Data Source
AI summary
A flexible display device includes a display panel configured to display an image, and a polarizing plate on the display panel. The flexible display device includes a folding area and a non-folding area. A first thickness of the polarizing plate in the folding area is greater than a second thickness of the polarizing plate in the non-folding area.