Touch Flexible Printed Circuit Foldable Portion Bending
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Solution Overview
Problem
The existing touch flexible printed circuits (TFPCs) in OLED display devices face issues with damage and reduced bonding stability due to the reserved amount for bending protrusion during the bonding process, which affects the accuracy and precision of the touch control function.
Innovation Solution
The TFPC design includes unfoldable and foldable portions connected by bending silkscreen printing lines, allowing the foldable portion to be folded and adhered to the unfoldable portions using an adhesive layer, thereby reducing the length of the circuit and eliminating damage from bending protrusion, improving bonding stability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a reserved amount for bending protrusion is provided during the bonding process of the touch flexible printed circuit, then the circuit can accommodate bending movements, but the bonding stability and accuracy are reduced due to damage and positioning errors
Solution Approach 1:
The touch flexible printed circuit is divided into distinct foldable portions and unfoldable portions. The foldable portions are specifically designed to be folded along bending silkscreen printing lines, separating the bending function from the bonding areas. This segmentation allows the circuit to accommodate bending movements in designated areas while keeping the bonding areas stable and precise.
Solution Approach 2:
The foldable portions are pre-folded along the bending silkscreen printing lines before the bonding process. This preliminary folding action eliminates the need for reserved bending protrusion during bonding, as the bending capability is already established in the folded structure. The bonding is then performed on the stable, unfolded portions with precise positioning.
2Reliability
If the touch flexible printed circuit is designed with foldable portions to reduce length, then the bonding stability is improved, but the structure becomes more complex
Solution Approach 1:
The touch flexible printed circuit utilizes a flexible substrate with integrated foldable portions that can be bent along predetermined lines. These foldable portions are designed as thin, flexible structures that maintain electrical connectivity while enabling compact folding. The flexibility is achieved through the substrate material and trace design, allowing the circuit to reduce length when folded while maintaining bonding stability on the unfoldable portions.
3Length of stationary object
If bending silkscreen printing lines are used to fold the foldable portion, then the length of the circuit is reduced and bonding damage is eliminated, but the manufacturing process becomes more complex
Solution Approach 1:
The traditional mechanical folding method is replaced with a printing-based approach. Bending silkscreen printing lines are used to define and create the foldable portions through a printing process rather than mechanical cutting or shaping. This substitution simplifies the manufacturing process by integrating the folding structure creation into the printing step, reducing the need for separate mechanical operations while achieving the desired circuit length reduction.
Data Source
AI summary
Disclosed are a touch flexible printed circuit, a display panel and a display apparatus. The touch flexible printed circuit includes at least two unfoldable portions and at least one foldable portion, the foldable portion is located between and connected to adjacent unfoldable portions, and the foldable portion is configured to make the adjacent unfoldable portions at least partially overlap to form a fold portion, when the foldable portion is folded.