Display Device Peripheral Region Light Transmitting Member Thickness Reduction
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Solution Overview
Problem
Flexible display devices face challenges in maintaining a thin profile and preventing contact failures due to the thickness of light transmitting members and adhesive layers, which can lead to adhesion and impact resistance issues.
Innovation Solution
The display device incorporates a first and second light transmitting member with a thickness difference, along with first and second protection layers of lower viscosity, to reduce the stepped portion thickness and enhance adhesion and impact resistance, while maintaining a predetermined color in the peripheral region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light transmitting members and adhesive layers are used to maintain color in peripheral region, then color display is improved, but device thickness increases
Solution Approach 1:
The patent transitions from a single-layer light transmitting member to a multi-layer stacked structure with alternating light transmitting and light shielding members. This dimensional organization allows the peripheral region to maintain color functionality while reducing the overall thickness by distributing optical functions across multiple thin layers rather than requiring a single thick layer.
Solution Approach 2:
The light transmitting member is segmented into multiple alternating layers (first light transmitting member, first light shielding member, second light transmitting member, second light shielding member) stacked in the thickness direction. This segmentation allows each layer to be thinner while collectively achieving the desired color display and light transmission properties, thereby reducing overall device thickness.
2Strength
If thicker adhesive layers are used to ensure adhesion, then bonding strength is improved, but contact failure resistance deteriorates
Solution Approach 1:
The patent introduces protection layers with specifically controlled viscosity parameters (lower viscosity than adhesive layers) at critical interfaces. This parameter change optimizes the balance between adhesion strength and contact failure resistance by using less viscous materials that can better conform to surface irregularities and provide more reliable contact without requiring excessive thickness.
Solution Approach 2:
Protection layers are introduced as intermediary elements between the light transmitting/shielding members and adhesive layers. These intermediary protection layers improve the overall bonding reliability by providing a compliant interface that reduces stress concentration and prevents contact failure, while allowing the adhesive layers to maintain appropriate thickness for strong bonding.
3Shape
If multiple light transmitting members are stacked to reduce stepped portion thickness, then profile uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple light transmitting members and light shielding members into a single integrated stacked structure. By merging these components into one unified assembly with alternating layers, the patent achieves uniform profile thickness while consolidating what would otherwise be separate manufacturing steps into a more integrated process, thereby managing complexity through structural integration.
Data Source
AI summary
A display device includes a display panel, a light shielding member, a first cover member, a first light transmitting member, and a second cover member. The display panel includes a display region where a plurality of display structures are arranged and a peripheral region surrounding the display region. The light shielding member is in the peripheral region on the display panel, and has a first opening that exposes the display region. The first cover member is arranged on the light shielding member. The first light transmitting member is in the peripheral region on the first cover member, and includes a second opening that overlaps the first opening. The first light transmitting member has a first color. The second cover member is arranged on the first light transmitting member.