Application Case | Clear Vision, Fast Transmission, Easy Deployment

Application of MV-PX6500GC/GM in Screen Defect Detection

The production process for liquid crystal displays is complex and precise, with each step susceptible to defects such as dead pixels, scratches, light leakage, colour abnormalities, and stains due to factors like material properties, environmental fluctuations, and equipment precision. These defects directly impact the user experience and market competitiveness of the final product.

In this context, machine vision technology, with its unique advantages of ‘non-contact inspection, high-resolution image capture, and intelligent algorithm analysis,’ has transformed the traditional model of ‘human-eye-dominated quality inspection.’

Detection difficulties
➤In the current era of 4K and 8K ultra-high-definition screens, the distance between screen pixels has been reduced to the sub-micron level. To accurately identify defects, industrial cameras must have extremely high resolution and imaging clarity.
➤ The massive amounts of data generated by high-resolution, high-frame-rate industrial cameras place high demands on the real-time performance of image processing systems. Otherwise, not only will there be insufficient data transmission bandwidth, but image processing delays will also increase, making it difficult to meet real-time detection requirements.

MindVision's independently developed MV-PX6500GC/GM is designed for high-precision inspection requirements. Its specific advantages include:

01 Meet high-speed transmission requirements
CXP12 interface, maximum effective data transmission bandwidth of 4850 Mbyte, which is four times that of a 10 Gigabit network, avoiding data congestion or delays and adapting to high-speed pipeline demand detection.

02 Detection of minor defects
65 million effective pixels + 3.2μm pixel size, capable of accurately analysing the characteristics of screen display units, clearly presenting screen details, and helping to identify minor defects (such as bright spots, dark spots, Mura unevenness, etc.).

03 Highly adaptable to different scenarios
The wide exposure time range (0.0020-67108.8640ms) can adapt to different physical characteristics and on-site lighting conditions. By optimising exposure to highlight defects, it improves the comprehensiveness and accuracy of detection. Combined with global exposure, it achieves drag-free detection on the production line.

04 Flexible combination of multiple channels
Supports flexible combinations of 1, 2, and 4 channels. Through multi-camera synchronous triggering, stitching covers a larger detection range, solving the problem of insufficient field of view of a single camera.

05 Industrial-grade reliability and ease of use
A single coaxial cable can be used for both signal triggering and power supply, simplifying wiring and reducing interference. The excellent SDK design eliminates the need for users to directly operate the CXP acquisition card, eliminating the need for cumbersome configuration processes and enabling quick integration into existing detection systems, making it as simple as using a gigabit industrial camera.
Every leap in product resolution is a test of the comprehensive capabilities of visual machines. The MV-PX6500GC/GM's advantages in terms of ‘clear visibility, fast transmission, and easy deployment’ provide an ideal solution for screen defect detection that combines precision, efficiency, and stability.

Application cases
Based on the differences in the optical characteristics of foreign objects in R/G/B monochrome light fields, the camera captures the characteristic anomalies caused by foreign objects and combines algorithms to achieve sub-pixel level accuracy in foreign object identification and classification.

Product parameters
MV-PX6500GC | MV-PX6500GM
optical dimensions | 29.9mm x 22.4mm
Sensor type | CMOS
Camera type | colour | black and white
pixel size | 3.2um x 3.2um
effective pixels | 65 million
Resolution @ Frame Rate | 9344*7000 [email protected]
Exposure method | Global exposure
Exposure time range (ms) | 0.0020-67108.8640ms
dynamic range | 66.0dB