Driver IC Resistance Detection for Weak Compression Bonds
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Solution Overview
Problem
In liquid-crystal display devices, the thinning of driver ICs during compression bonding can lead to weak compression bonds at the outer region of bumps, causing potential inactivation or malfunction due to improper electrical connection, and existing methods rely on time-consuming and costly resistance measurements using multiple pins and additional wiring patterns.
Innovation Solution
Incorporating a resistance detection circuit on the TFT substrate that measures resistance between bumps to detect weak compression bonds, eliminating the need for visual inspection and reducing the complexity of resistance measurements by using integrated wiring for resistance detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If driver IC is thinned during compression bonding, then integration density is improved, but compression bond strength at outer bump region deteriorates
Solution Approach 1:
The patent applies preliminary action by measuring resistance between adjacent bumps before compression bonding to predict potential weak bond locations. This allows the system to anticipate and compensate for areas where thinning may cause insufficient compression bond strength, enabling preventive measures to be taken before the actual bonding process.
Solution Approach 2:
The patent implements feedback by using resistance measurement results to guide the compression bonding process. The measured resistance values provide information about bump positioning and potential bonding quality, which feeds back into the bonding process to adjust compression force distribution and ensure adequate bond strength even in thinned driver IC regions.
2Difficulty of detecting and measuring
If traditional visual inspection method is used to detect weak compression bonds, then detection capability is provided, but inspection time and cost increase
Solution Approach 1:
The patent replaces the mechanical visual inspection method with an electrical resistance measurement system. Instead of manually examining ACF particle indentations, the system uses electrical resistance measurements between bumps to automatically detect weak compression bonds, eliminating the need for time-consuming visual inspection while maintaining detection capability.
Solution Approach 2:
The patent enables self-service by allowing the driver IC itself to provide bonding quality information through its electrical characteristics. The resistance measurement utilizes the driver IC's own electrical pathways to indicate bonding status, eliminating the need for external inspection equipment and manual examination processes.
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
Facilitates easy detection of weak compression bonds, improves manufacturing yield, reduces inspection costs, and ensures reliable electrical conduction by quantitatively assessing bond strength through electrical characteristics without the need for visual inspection or multiple measuring pins.
Implementation Method 1
a resistance detection circuit that detects resistance between the first bump and the second bump
Data Source
AI summary
A display device includes, on a TFT substrate, a driver IC having a first bump and a second bump, a first terminal and a second terminal connecting respectively to the first bump and the second bump, and wiring interconnecting the first terminal and the second terminal. The driver IC also includes a resistance detection circuit that detects resistance between the first bump and the second bump.