Polarizer Protection Layer for Bendable Display Panels
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Solution Overview
Problem
Traditional display panels with bending regions are prone to cracks and gaps, allowing water and oxygen to invade the polarizer, which affects its yield and performance.
Innovation Solution
A display panel design featuring a non-display region with a bonding region and an unbonding region, where a protection layer covers the side surface of the polarizer, reducing direct contact with the external environment and incorporating a cutting process to form protection portions that enhance the polarizer's durability and reduce contact areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the layer structure in the bending region is bent to achieve high screen-to-body ratio and ultra-narrow frames, then the display panel achieves thinner and lighter design with higher screen-to-body ratio, but cracks and gaps occur especially at the circumferential side of the polarizer, allowing water and oxygen to invade
Solution Approach 1:
The patent applies preliminary action by forming the protection layer before the bending process. The protection layer is deposited on the polarizer in the planar state, covering the side surface before any bending occurs. This ensures that when the panel is subsequently bent to achieve high screen-to-body ratio, the protection layer is already in place to prevent cracks and gaps from forming at the circumferential side of the polarizer, thus maintaining reliability throughout the bending process.
Solution Approach 2:
The protection layer serves as a beforehand cushioning mechanism against potential damage during bending. By providing a protective coating on the polarizer's side surface before bending, the patent creates a buffer that prevents direct stress concentration and crack formation at vulnerable edges during the bending process, thereby cushioning against reliability degradation.
2Weight of moving object
If traditional bending region design is used to achieve thin and light panels, then the display panel achieves reduced thickness and weight, but water and oxygen can invade the polarizer through cracks and gaps, affecting yield
Solution Approach 1:
The patent employs a protection layer as a thin film structure that conformally coats the polarizer's side surface. This thin film follows the contours of the polarizer even during bending, maintaining continuous coverage without cracking. The flexible nature of this thin film layer allows it to accommodate the bent shape while continuously blocking water and oxygen pathways, thus protecting against harmful factor invasion while maintaining the thin and light design.
3Device complexity
If the polarizer is exposed in the bending region to achieve simpler structure, then the manufacturing process is simplified, but the polarizer becomes vulnerable to cracks and environmental damage
Solution Approach 1:
The protection layer serves multiple functions simultaneously: it protects the polarizer from mechanical cracks during bending, prevents water and oxygen invasion, and maintains structural integrity. This single multi-functional layer eliminates the need for additional complex protective structures, thereby maintaining simple device complexity while comprehensively addressing polarizer protection needs through one universal solution.
Data Source
AI summary
A display panel, a display apparatus, and a fabrication method of a display panel. The display panel includes a display region and a non-display region, the non-display region includes a bonding region and an unbonding region, and the display panel includes: a display substrate including a substrate and a display device layer disposed on the substrate. The display device layer is at least partially located in the display region; a polarizer disposed on a side of the display device layer away from the substrate, The polarizer includes a first surface away from the substrate, a second surface close to the substrate, and a side surface connecting the first surface and the second surface; a protection layer including a side protection portion covering at least the side surface.