Plastic Display Panel Bonding Quality Test via Resistance Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In plastic display panels, it is difficult to visually determine the degree of indentation and bonding quality between conductive balls and link terminals due to similar indentation patterns and opaque metal link lines, making it challenging to assess the electrical connection and adhesion.
Innovation Solution
The implementation of resistance patterns connected to link terminals through an internal resistor of a driving element, with test pads for resistance measurement, allows for the determination of bonding quality by measuring resistance values between these patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual inspection method is used to determine bonding quality, then the process is simple and quick, but the measurement precision is insufficient due to similar indentation patterns and opaque metal link lines
Solution Approach 1:
The patent replaces the visual inspection method (mechanical/optical system) with an electrical resistance measurement system. By measuring resistance between test pads that are electrically connected through link terminals and conductive balls, the system objectively determines bonding quality without relying on visual assessment of indentation patterns, thereby resolving the contradiction between operational simplicity and measurement precision.
Solution Approach 2:
The patent introduces resistance measurement as an intermediary parameter to assess bonding quality. Instead of directly observing the bonding interface, the system measures electrical resistance through the conductive path (test pads → link terminals → conductive balls → link terminals → test pads), where the resistance value serves as a reliable indicator of bonding quality, overcoming the limitations of direct visual inspection.
2Reliability
If compression process is performed to ensure sufficient conductive ball compression, then electrical conductivity is improved, but manufacturing time increases due to necessary testing operations
Solution Approach 1:
The patent replaces complex visual inspection procedures with simple electrical resistance measurements. The resistance measurement can be performed quickly and automatically, providing reliable assessment of conductive ball compression quality without requiring time-consuming visual examination, thus maintaining electrical connection reliability while improving manufacturing throughput.
Solution Approach 2:
The resistance measurement system provides self-assessment of bonding quality. The measurement process itself reveals whether sufficient compression has occurred, eliminating the need for separate, time-consuming testing operations. The system uses the electrical path through the bonded components to automatically evaluate the bonding quality.
3Measurement precision
If microscope and camera system is used to test indentations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces the complex optical measurement system (microscope and camera) with a simple electrical resistance measurement system. The resistance measurement apparatus is inherently simpler than optical microscopy equipment, yet provides equivalent or superior precision in determining bonding quality by measuring the electrical path through the conductive balls and link terminals.
Solution Approach 2:
The patent uses electrical resistance as an intermediary parameter that simplifies the measurement process. Instead of directly observing and measuring physical indentation dimensions with complex optical equipment, the system measures electrical resistance, which naturally reflects the bonding quality and conductive path integrity, thereby reducing device complexity while maintaining measurement precision.
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 method enables accurate assessment of bonding quality, reduces manufacturing time, enhances yield rates, and facilitates defect detection in plastic display panels.
Implementation Method 1
two resistance patterns provided in a bonding part, which are connected to two link terminals, which are electrically connected to each other through an internal resistor of a driving element bonded to the bonding part, and connected to two test pads for resistance measurement
Data Source
AI summary
Discussed is a flat display panel. The flat display panel includes a display area to display an image with a plurality of panel electrodes, and a non-display area. A plurality of link lines connected to the panel electrodes are provided in the non-display area. The display area and the non-display area are provided in a base substrate. A plurality of link pads, electrically connected to the link lines and a plurality of link terminals provided in a driving element, are provided in a bonding part adhered to the driving element in the non-display area. Two resistance pads are respectively connected to two link terminals which are electrically connected to each other through the driving element. At least two pads are respectively connected to the two resistance pads.