As competition in the smart phone market intensifies, consumers' demands for product quality, appearance, and performance are continuously rising. This necessitates that mobile phone manufacturers invest more effort into quality control during every production stage, especially for the core component: the mobile phone screen. The Vision Measuring Machine (VMM), as a high-precision, non-contact measuring device, plays a critical role in the quality inspection of mobile phone screens.
Case Background
A renowned mobile phone manufacturer faced a challenge: how to efficiently and accurately inspect large batches of mobile phone glass panels and touch screen modules, ensuring dimensional accuracy, edge flatness, and the absence of appearance defects. Traditional contact measurement methods were inefficient and could potentially damage the precise screen surface. The manufacturer ultimately introduced a fully automated Vision Measuring Machine solution.
Application Scenarios and Inspection Content
The Vision Measuring Machine is widely used across multiple stages of the mobile phone industry chain. Key applications for screen inspection include:
- Dimensional and Geometric Accuracy Measurement: Precisely measuring the geometric dimensions of the screen, such as length, width, diagonal dimensions, frame width, and the distance from pixels to the frame.
- Edge and Flatness Detection: Ensuring that the cutting edges of LCD/OLED panels are neat and free of burrs, and detecting the overall flatness or warpage of the entire screen.
- Defect Detection: Utilizing a high-magnification optical imaging system to automatically detect various micro-defects generated during screen production, such as bubbles, impurities, scratches, and cracks.
- Hole Position and Connector Measurement: Measuring the size, shape, and positional accuracy of features like speaker openings, charging ports, and SIM card slots.
Core Advantages
In this case study, the main advantages brought by the Vision Measuring Machine include:
- High-Precision Non-Contact Measurement: Employing optical imaging and machine vision technology avoids potential screen damage caused by contact measurement while ensuring micron-level measurement accuracy.
- Automation and Efficiency: The fully automated VMM can achieve programmatic, rapid, and batch measurements, greatly improving inspection efficiency on the production line and meeting the demands of high-volume manufacturing.
- Data Analysis and Traceability: The accompanying measurement software supports automatic generation of Excel reports and SPC (Statistical Process Control) analysis reports, which helps monitor process data in real-time and optimize production yield rates.
- Flexibility and Adaptability: Capable of handling the complex shapes and fine structures of mobile phone screens through a flexible combination of light sources (e.g., surface light, back light, coaxial light) to clearly capture various detailed features.
By introducing the Vision Measuring Machine, the mobile phone manufacturer significantly enhanced its product quality control standards, ensuring that every screen meets strict design criteria, successfully overcoming bottlenecks in precise dimension inspection, and solidifying its competitive advantage in the market.