Flat panel displays are ubiquitous in modern electronic devices, and their production involves several critical steps, each of which plays a crucial role in the quality and reliability of the final product.
In every step of production, ISRA VISION's automatic inspection systems ensure that only flawless glass meeting quality standards is delivered to your customers.
The benchmark for inspection of thin glass with micrometer precision
During the production of thin glass, the glass ribbon passes through several inspection stages to ensure the production of high-quality products. Our optical inspection system is an integral part of this process, enabling automatic real-time detection of common defects and even tiny threads as small as 10 µm.
Designed specifically for thin glass inspection on float glass, the system uses advanced technologies such as multi-view imaging and patented Dynamic Moiré technology with switchable high-power LED illumination to achieve optimal defect detection and sensitivity to optical distortion.
When a defect is detected, the system automatically provides feedback to personnel and classifies the defect by severity, size, type and location. This enables fast response and correction of problems, reducing production downtime and costs.
In addition, the comprehensive defect data collected by the system allows for quick and easy root cause analysis, enabling continuous optimization of the glass manufacturing process.
At every step of thin glass sheet production, several advanced inspection systems play a crucial role in quality assurance.
High-precision edge inspection and permanent process optimization
A specially designed system inspects the edges of thin glass substrates utilizing multiple illumination channels and high-resolution cameras. With its 180° view of the glass edge, this system detects grinding deviations and provides important data for improving the grinding process. It also reliably classifies all typical edge defects such as chips, cracks, shiners, burn marks, and asymmetries, guaranteeing a reliable quality assessment.
3-in-1 solution ensures flawless thin glass substrates at cleanroom quality
Another optical inspection system inspects the surfaces of thin glass substrates with the combined use of up to three inspection tasks. In the process, the system reliably detects and classifies even the smallest glass and surface defects. At the same time, it detects even the smallest scratches regardless of orientation. Finally, for monitoring cleanroom quality, a particle counting system detects all particles down to the micrometer range, classifies them by size and provides a statistical analysis of the particle distribution. It thus provides reliable data for monitoring cleanroom quality and optimizing the cleaning process.
Reliable quality classification with microscopic analysis
To ensure reliable quality classification even for the smallest defects, our systems analyze the detected defects in more detail using an automatic microscope. Using the high-resolution microscope images, the defect classification is verified again, the size of the defect is precisely measured and its position in the glass is determined. The collected precise information ensures the reliable classification of glass sheets that meet the specifications for further processing or delivery.
Small-format glasses are used for cutting-edge products such as smartphone displays, head-up displays and deflection mirrors, as well as car displays. A variety of quality problems can arise in the production process, such as inconsistent sizes or shapes, imperfections or defects in the glass or on the surface, poor clarity or visibility, and fragility or susceptibility to breakage.
To make matters worse, the quality control of reflective or transparent components is one of the most demanding tasks in optical quality assurance. ISRA VISION has set standards with phase-measuring deflectometry, a particularly reliable optical measurement method for highly reflective objects. This way, no defect remains undetected.
The inspection of finished or pre-finished parts like cover glasses, ultra-thin glass, foldable glasses, or advanced transparencies require advanced features like contact-less conveying and complex inspection - including free form shape inspection algorithms and multi-zone smart inspection (e.g. zone definitions, printing, etc.).
Smartphone displays: quality control before and after the display layers are joined together
When the various display layers are joined, imprints on the cover glass and other defects can occur that are not visible to the naked eye but can impair the optical properties and function. Our optical surface inspection reliably detects local defects such as unevenness, carrier structures or so-called read-throughs before or after joining the display layers.
Head-up displays & deflection mirrors
Head-up display deflection mirrors must be perfectly shaped and coated, because this is the only way they can produce an optimum image. Deviations in the shape of the deflection mirrors or defects in the coating can disrupt the image and thus impair driving safety. ISRA VISION’s automated inspection reliably detects shape deviations and surface defects in just one measurement pass. The result: Only flawless mirrors are delivered.
Concave shapes are being used more and more frequently, especially in the automotive sector, as the displays require less space for the same display size. At the same time, they place increased demands on quality inspection, because in addition to the flawless surface and optical quality, the fit and shape must also be exactly right. The inspection system for phase-measuring deflectometry checks the shape and surface of curved and flat displays and cover glasses in just one measuring pass, thus enabling reliable and highly efficient quality control for car displays.
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