Compensating Film for Flexible Circuit Board Stability
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Solution Overview
Problem
Existing display devices face challenges in maintaining the reliability and reducing defects in flexible printed circuit boards when subjected to external forces, particularly during the assembly of cover members, due to variations in position and shape caused by bending and curvature.
Innovation Solution
The implementation of an adhesive film with a compensating part that overlaps with the curved flexible printed circuit board, filling gaps and maintaining contact with the window assembly, thereby reducing movement and deformation, and ensuring the adhesive, connecting, and compensating parts are integrally formed as a single unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible printed circuit board is bent to connect the display panel and driving circuit board, then electrical connection is achieved, but position and shape variations occur under external forces
Solution Approach 1:
The adhesive film is designed as a flexible thin film structure that includes an adhesive part and a compensating part. The compensating part is configured to overlap with the curved part of the flexible printed circuit board, providing flexibility accommodation while maintaining structural stability. This allows the adhesive film to adapt to the bent shape of the circuit board while preventing position and shape variations under external forces.
Solution Approach 2:
The adhesive film acts as an intermediary element between the display panel and the flexible printed circuit board. It provides a stable bonding interface that compensates for the movements and deformations of the bent circuit board, thereby maintaining reliable electrical connections and preventing defects without restricting the necessary flexibility.
2Stability of the object's composition
If the adhesive film extends to overlap with the curved flexible printed circuit board, then position stability is improved, but the adhesive film structure becomes more complex
Solution Approach 1:
The adhesive film is segmented into two functional parts: an adhesive part that bonds the display panel and window assembly, and a compensating part that overlaps with the curved flexible printed circuit board. This segmentation allows each part to perform its specific function optimally while keeping the overall structure manageable and manufacturable.
Solution Approach 2:
The adhesive film serves multiple functions: it provides structural bonding between components, compensates for the curvature of the flexible circuit board, and maintains position stability under external forces. By designing a single adhesive film structure that performs multiple functions, the overall device complexity is reduced compared to using separate components for each function.
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
This solution effectively reduces defects and improves the reliability of the display device by maintaining the position and shape of the flexible printed circuit board, even under external forces, enhancing the structural integrity and performance.
Implementation Method 1
an adhesive part between the window assembly and the display panel to couple the display panel and the window assembly
Implementation Method 2
The implementation of an adhesive film with a compensating part that overlaps with the curved flexible printed circuit board, filling gaps and maintaining contact with the window assembly, thereby reducing movement and deformation
Data Source
AI summary
A display device, including a display panel that displays an image; a flexible printed circuit board including an attaching part attached to one end of the display panel and a curved part extending from the attaching part and not overlapping with the display panel; a window assembly on an upper surface of the display panel; an adhesive part between the window assembly and the display panel to couple the display panel and the window assembly; and a compensating part not overlapping with the display panel, overlapping with the curved part, and on a same layer as the attaching part.