Flexible Board Cover Member for Display Moisture Protection
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Solution Overview
Problem
Flexible circuit boards in display devices are prone to cracking and loss of bending characteristics due to moisture and oxygen permeation, especially when repeatedly bent, which affects their durability and performance.
Innovation Solution
A display device design that includes a flexible board with a base substrate, a cover member, and a blocking member to prevent moisture and oxygen permeation, where the cover member is strategically positioned on the flat areas and does not overlap with the bending areas, maintaining the board's bending characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cover member is added to prevent moisture and oxygen permeation, then reliability is improved, but device complexity increases
Solution Approach 1:
The flexible board is divided into a flat area and a bending area, with the cover member selectively applied only to the flat area. This segmentation allows the cover member to protect the connection boundary without interfering with the bending characteristics of the bending area, thus improving reliability while minimizing added complexity.
Solution Approach 2:
The cover member is positioned to cover only the boundary at which the base substrate and display module are connected, rather than covering the entire flexible board. This localized application provides protection exactly where needed (at the connection boundary) while leaving the bending area exposed to maintain its flexibility and bending characteristics.
2Reliability
If a cover member is added to prevent moisture and oxygen permeation, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The cover member is formed to extend along the bending axis toward the bending area, creating a preliminary barrier that prevents moisture and oxygen from reaching the connection boundary. This preliminary positioning ensures protection is in place before the flexible board undergoes bending operations, simplifying the manufacturing process by establishing protection in advance rather than requiring precise post-positioning.
Data Source
AI summary
A display device includes a display module configured to display an image, and a flexible board in which a flat area and a bending area arranged in one direction in a plan view are defined, wherein at least a portion of the flat area is connected to the display module, and wherein the flexible board includes a base substrate connected to the display module, a cover member on the flat area, and covering a boundary at which the base substrate and the display module are connected to each other, and a blocking member on the flat area, and in contact with the cover member.