Tape Carrier Dummy Pattern Resin Edge Wrinkle Prevention
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Solution Overview
Problem
Tape carriers for liquid crystal display devices experience signal line breakage due to wrinkles formed at the edge of the resin applying region, where the strength is non-continuous, caused by thermal expansion differences between the glass and circuit substrates, leading to durability issues.
Innovation Solution
Incorporating a dummy pattern that traverses the edge of the resin applying region without interfering with the signal lines, increasing the rigidity and elasticity of the base film and the resin applying region, thereby preventing signal line breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the tape carrier is made with a short length between input and output terminals, then the device size is reduced, but wrinkles form due to thermal expansion differences between glass and circuit substrates
Solution Approach 1:
The patent applies local quality by creating a resin-applying region with different mechanical properties than the rest of the base film. This localized resin application reinforces the tape carrier at the specific location where wrinkles tend to form (near the driver IC and terminal edges), allowing the overall device to maintain a compact size while preventing wrinkles through localized structural enhancement.
Solution Approach 2:
The patent uses composite materials by combining the base film (polyester or polyimide) with resin material in a specific configuration. The resin-applying region creates a composite structure that leverages the thermal and mechanical properties of both materials to resist wrinkle formation while maintaining the short terminal length for compact device size.
2Adaptability or versatility
If the tape carrier operates through temperature changes, then the device functions in various environments, but signal lines break due to wrinkles at the resin applying region edge
Solution Approach 1:
The patent implements beforehand cushioning by pre-reinforcing the tape carrier with resin at the vulnerable edge regions of the resin-applying area before temperature changes occur. This preventive reinforcement cushions the signal lines against the mechanical stress of thermal expansion and contraction, preventing breakage while allowing the device to operate across various temperature ranges.
Solution Approach 2:
The patent applies local quality by providing differential reinforcement - the resin-applying region with extended resin coverage at the edges provides enhanced local protection exactly where signal lines are most vulnerable to wrinkle-induced breakage during temperature cycling, while other regions maintain their original properties.
3Area of stationary object
If the resin applying region is minimized for compactness, then the device size is reduced, but the strength continuity at the edge is compromised
Solution Approach 1:
The patent applies segmentation by dividing the resin application into two distinct zones: a core resin-applying region for compactness and an extended resin coverage at the edges for strength reinforcement. This segmented approach allows the main body to remain compact while the edge regions receive additional resin to maintain strength continuity, resolving the contradiction between minimized area and edge strength.
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
Effectively suppresses the formation of wrinkles and prevents signal line breakage at the resin applying region, enhancing the durability of the tape carrier and liquid crystal display device.
Implementation Method 1
increasing the rigidity and elasticity of the base film and the resin applying region
Implementation Method 2
increasing the rigidity and elasticity of the base film and the resin applying region
Implementation Method 3
when returning from high temperature to normal temperature due to the difference in expansion coefficients caused by heat of when the glass substrate and the circuit substrate are connected
Data Source
AI summary
To provide a tape carrier capable of suppressing the formation of wrinkles at a non-continuous portion of strength of the tape carrier and avoid the signal line breakage associated with bending operation. A driver IC is mounted on an insulation film tape, input terminal is arranged at one end and an output terminal is arranged at the other end of the insulation film tape, input signal lines and output signal lines are individually mounted between the driver IC and each terminal, and a resin applying region is arranged at a mounting portion of the driver IC. An independent dummy pattern without connecting destination to be electrically connected to is arranged near each end on the side not facing each terminal of the driver IC on the insulation film tape, and the respective end on the driver IC side of each dummy pattern is extended into the resin applying region.