Inspection systems for flat panel display glass

  • Fast ROI through short setup time
  • High level of customer satisfaction
  • Less waste and lower total cost of ownership
  • Maximum throughput of high-quality products
  • Process optimization through intelligent data management
FPD header

Flawless quality of flat panel display glass

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.

Glass ribbon inspection

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.


  • Reliably detects all relevant defects
  • Detects even the tiniest scratches and core bubbles using patented cross-dark field illumination
  • Auto-classifies all findings according to type, size, and severity
  • Real-time feedback about defect types, size, and position
  • Monitors the optical power across the full glass ribbon; detects critical optical lines; monitors the Zebra angle
  • Precisely measures core size using the transmission channel, and defect depth via a reflection channel
  • Detection of cords down to 10 µm 
  • Unique patented Dynamic Moiré technology for monitoring of the optical power 
  • Robust cooling with advanced air cooling system 
  • Multi-view imaging and patented Dynamic Moiré technology 
  • Bubbles, stones, knots 
  • Top or bottom tin 
  • Scratches, streaks, cracks 
  • Contamination 
  • Edge defects 
  • Warpage 
  • 30 µm optical resolution  
  • Up to 8 optical channels for advanced detection performances 
  • Patented channel for optical lines detection and measurement (reams, Zebra,…)  
  • Detection of cords down to 10 µm

CTIEC automates ultra-thin glass inspection

As a producer of ultra-thin glass for displays, electronics, and photovoltaic systems CTIEC has high quality requirements. They needed a system which offered an accurate and reliable glass substrate inspection with automated, fast feedback. Inspection systems from ISRA VISION combine multi-view imaging and the patented Dynamic Moiré technology to achieve unmatched sensitivity to optical distortion.

Learn how CTIEC automated their in-line inspection of ultra-thin glass.


Glass plate inspection

FPM-System 16-9

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. 


  • 3-in-1 saves space and operating costs
  • Return on investment achieved in the shortest time
  • Reduced costs and maintenance efforts achieved with multi-purpose systems and short line length
  • Defect inspection: Advanced scratch detection up to 15kLux 
  • Edge inspection: Quality control of all 4 edges and corners 
  • Particle Counting: Top and bottom inspection 
  • Reviewing: Precise size information and defect depth measurement 
  • Sub-Micron Particles 
  • Fine scratch 
  • Shell, grinding defects, corners 
  • Inclusions, bubbles, platinum 
  • Stones, Pt needles, stain, cullet 
  • Optical resolution  
  • Inspect: 15 µm/px 
  • Particle: 10.5 µm/px  or 21 µm/px 
  • Detection of particles down to 1 µm 
  • Illumination:  
  • Distortion Channel: Optic & Faint 
  • Transmission Bright Field 
  • Cross Dark Field 
  • Reflection Dark Field 

Download additional information

FPM-Master brochure en

FPM-Master brochure en
805 KB

FPM-Master brochure cn

FPM-Master brochure cn
902 KB

FPM-Master brochure ko

FPM-Master brochure ko
914 KB

Perfect display glass quality for Hunan Shahong

The constant trend towards larger displays introduces increasing challenges for quality and production yield of display glass. ISRA VISION inspection systems combine multiple inspection steps in a highly integrated single system to detect and classify even the tiniest defects on the surface.

Learn how our systems helped Hunan Shahong to meet the demanding customer requirements while also boosting manufacturing efficiency.


Small format glass inspection


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.

Ultra-Thin Glass inspection

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.).


  • Ship only defect-free material and avoid customer claims
  • Improve quality while ensuring high standards and process optimization
  • Reduce rejects prior to assembly
  • Improve processes and optimize yield
  • Automatic optical inspection of ultra-thin glass
  • Complete solution from conveyor to inspection to process monitoring
  • Possibility of operating several inspection systems on parallel production lines
  • Edges: Chippings
  • Surface: Bubbles, bumps, dents, dirt, etching defects, finger prints, inclusions, scratches
  • Point defects
  • Inspection width (incl. drift): 200 mm
  • Inspection cycle: approx. 1 sec per smartphone glass (depends on the actual size)
  • Glass thickness: 0.03 mm to 2 mm
  • Glass color / transmission: 80 % for white light
  • Environmental conditions: Temperature (at illumination / camera beam): 20 °C ~ 30 °C Humidity: 40% ~ 50%

Quality control of reflective or transparent components

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.


  • Fast and precise CAD comparison
  • Fast capturing of form and defects: Only one measuring tool for two measuring tasks
  • Traceability: detection of production defects over specific periods of time
  • Flexibility in size, shape, and variety of parts
  • Production optimization with clear defect classification and traceability
  • Automatic optical inspection of ultra-thin glass at line speeds with complete solution from conveyor to inspection to process monitoring
  • 100% defect detection and form control for reflective or transparent surfaces 
  • Fully automated inspection and evaluation 
  • Shape and defect inspection in one measurement 
  • Determination of stable and comparable values 
  • Multi-Part Inspection: Simultaneous measurement of multiple parts in a tray 
  • Large-Part Inspection: Inspection of large, curved parts 
  • Real-time production monitoring & process control
  • Edges: Chippings, cracks 
  • Surface: Scratches, inclusions, Polishing marks, Carrier structures, read throughs, orange peel, dents, bubbles, bumps, dirt, fingerprints, etching defects 
  • Shape: Form deviations 
  • Measuring method: Phase-measuring deflectometry
  • Measuring fields: 300x200 - 600x400 mm²
  • Lateral resolution: ~20-240 µm 
  • type. Measuring time: 3-12 seconds

Download additional information

SpecGAGE3D Display brochure en

SpecGAGE3D Display brochure en
561 KB

SpecGAGE3D Display brochure cn

SpecGAGE3D Display brochure cn
487 KB

FPM Smart Flyer en

FPM Smart Flyer en
253 KB

FPM Smart Flyer cn

FPM Smart Flyer cn
631 KB

VIAOPTIC automates plastic optics inspection

The high quality standards of customers in the automotive industry must also be reflected in the excellence of the plastic injection-molded optical elements. Based on deflectometry, the SpecGAGE3D product family enables the automated measurement and inspection.

Discover how VIAOPTIC GmbH automated their measurement of plastic optics and simplified serial inspection considerably.


Production analytics - Data-driven efficiency

The web-based production analytics platform allows you to check the system status of all production lines at a glance or analyze production data in detail. With the quality management system, you analyze historical data, monitor current inspection data in real-time, and identify future trends in your production process.

Early detection of production defects

Detect and quickly identify the cause of threshold value violations at every stage of production with live status information and automatic alerts. As a result you can quickly resolve production defects, shorten downtime, and reduce production costs.

Predictive maintenance

You can prevent potential system failures by analyzing real-time data from the sensors and monitoring systems. This allows proactive planning of maintenance, based on the actual condition of the machines, instead of following a fixed schedule. This data-driven approach saves costs through reduced downtime and increased overall productivity, as well as longer production line life. 

Optimization of production

Dashboards allow you to compare production line and product data onsite or remotely, providing key insights for optimization. This enables you to make informed professional decisions along your value chain to increase the product quality as well as profitability. You can continuously track the progress of optimization measures and present them with visualized advanced reports.

Your benefits

  • Time-saving multi-line overviews, one view for all quality-related information
  • Minimize downtime by monitoring system health data
  • Faster reaction to quality issues with quality data monitoring
  • Fast elimination of production defects, reduction of production costs
  • Improved maintenance for reduced downtime, higher overall productivity and longer production line life

Key Features

  • Overview on production data and plant status
  • Live insights from real time data
  • Department oriented dashboards, customer specific adaptations are possible
  • Web-based solution, no client software installation required
  • Threshold monitoring and alerting
  • Open to integrate relevant third-party data and export data to the customer's systems

Service solutions and individual trainings

For the efficient and future-proof operation of your production systems our highly qualified service teams support you globally in all matters. We provide the implementation, maintenance and servicing as well as the analysis and optimization of your systems.

Learn in the ISRA VISION Academy how our competent trainers always keep your employees up to date with the latest knowledge so that system operators, product engineers and quality managers become real inspection experts.

Contact our experts

Jennifer Kirstein

Albert-Einstein-Allee 36-40
45699 Herten

Phone: +49 / 2366 / 9300-131

E-Mail: [email protected]

Contact us