Color-Changing Adhesive Member for Chip Attachment Flatness
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Solution Overview
Problem
Existing display devices face challenges in verifying the attachment flatness of driving circuit chips to substrates, which can affect the reliability and performance of the devices.
Innovation Solution
An adhesive member with a color-changing material is used, featuring a first adhesive layer with conductive balls and a second adhesive layer that includes a color-changing pattern, allowing for verification of attachment flatness by observing color changes due to pressure or heat applied during the attachment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional adhesive member is used to attach driving circuit chips to substrates, then the attachment is completed, but the attachment flatness cannot be verified
Solution Approach 1:
The patent incorporates a color-changing material into the adhesive member that changes color in response to pressure or heat applied during the attachment process. This allows visual verification of attachment flatness by observing color changes across the adhesive member surface, directly addressing the verification problem without adding complex external measurement systems.
Solution Approach 2:
The color-changing material acts as an intermediary between the attachment process and the verification process. It translates mechanical/thermal conditions during attachment into visible optical signals, enabling indirect observation of attachment quality through color changes rather than requiring direct measurement of flatness.
2Measurement precision
If the adhesive member includes color-changing material for verification, then attachment quality can be verified visually, but the adhesive member structure becomes more complex
Solution Approach 1:
The patent merges the adhesive function and the verification function into a single integrated adhesive member. The color-changing material is incorporated within the adhesive layer itself, combining bonding and measurement capabilities in one component rather than requiring separate adhesive and measurement systems.
Solution Approach 2:
The adhesive member serves multiple functions: it provides mechanical bonding between the driving circuit chip and substrate, and simultaneously serves as a visual indicator for attachment quality verification. This multi-functionality reduces the need for additional separate components.
3Area of stationary object
If the color-changing material is applied throughout the entire adhesive layer, then complete coverage for verification is achieved, but the conductive pattern formation becomes difficult
Solution Approach 1:
The patent applies the color-changing material selectively to specific regions of the adhesive member rather than uniformly across the entire surface. This localized application allows the material to be positioned in areas that do not interfere with conductive ball placement or electrical connection formation, while still providing sufficient coverage for verification purposes.
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
The adhesive member effectively verifies and ensures proper attachment flatness of driving circuit chips to substrates, enhancing the reliability and performance of display devices by providing a visual indication of attachment quality.
Implementation Method 1
a second adhesive layer that includes a color-changing pattern, allowing for verification of attachment flatness by observing color changes due to pressure or heat applied during the attachment process
Data Source
AI summary
A display device includes a substrate including a conductive pad, a driving chip facing the substrate and including a conductive bump electrically connected to the conductive pad and an inspection bump which is insulated from the conductive pad, and an adhesive member which is between the conductive pad and the driving chip and connects the conductive pad to the driving chip. The adhesive member includes a first adhesive layer including a conductive ball, and a second adhesive layer facing the first adhesive layer, the second adhesive layer including a first area including a color-changing material, and a second area adjacent to the first area and excluding the color-changing material.