White Papers

Detailed information on our technology and solutions, written by industry experts.

Optical Tests for Automotive Displays

industry. However, procedures that have been used so far and the use of simple image processing cameras often do not do justice to the task at hand. The displays used in automobiles are developing rapidly. The size and the resolution are constantly increasing to the extent that the 15.6 inch diagonals and 1920 x 1200 pixels find their way into the middle class.

Published by Automobil Elektronik I all-electronics.de on October 22, 2019.

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Methods for Measuring Small Defects in Automotive Curved Displays

optimize the accuracy of small defect detection (pixels and lines) in automotive curved displays.

In this White Paper, you will learn:

  • The impact of curved displays on automotive design and human visual comfort
  • Radiant parameters for lab-based testing of line and pixel defect analysis in curved displays
  • Results of testing based on the application of various system resolutions (to 16 megapixels) and depths of field (to F/13)
  • Results of testing based on the use of different test methods, including single-channel analysis, multi-channel analysis, and multi-image analysis
  • Recommended curved display test methods for labs and production environments

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Understanding Imaging System Specifications for Pixel-Level Measurement of Displays: Comparing Measurement Performance of Current CCD and CMOS Sensors

It examines measurement examples to compare sensor type (CCD versus CMOS), pixel size, and signal-to-noise ratio (SNR), and the effect of these properties on the accuracy and repeatability of data for pixel-level display measurement.

In this White Paper, you will learn about:

  • Pixel-level display measurement challenges
  • Importance of measurement repeatability and precision
  • Measurement system specifications
    • Resolution
    • Signal-to-Noise Ratio (SNR)
    • Photo-sensor size and well capacity
    • Photon Transfer Curve (PTC)
  • A comparison of today's CCD vs. CMOS performance for pixel-level measurement

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Method for Repeatable Measurement of Sparkle in Anti-Glare Displays

Measuring perceived sparkle ensures that the quality standard for AG displays is driven by the intended experience of the viewer. Such a measurement can be used not only in quality control during display production, but also in supplier qualification by OEMs who source third-party displays for integration. This paper describes precise geometric, optical, and software parameters of a sparkle measurement method, which has been proven to match human visual perception of display quality with repeatable results. Using this method, OEMs and manufacturers of displays can define precise, measurable tolerances for sparkle and establish standard quality control processes for anti-glare (AG) displays.

In this White Paper, you will learn about:

  • Anti-glare (AG) layer properties and their effect on visual display quality
  • Tools for isolating sparkle for accurate AG display measurement
  • System and measurement parameters that enable repeatable quantification of sparkle percentage
  • How data has been correlated with human perception of display quality

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How to Use Imaging Colorimeters for Automated Visual Inspection of Displays

This white paper describes how imaging colorimetry can be used in a fully-automated testing system to identify and quantify defects in high-speed, high-volume production environments.

In this White Paper, you will learn about:

  • Differences between display inspection methods
  • Measurement components and setup of imaging colorimeter-based display test systems
  • Using AVI to detect common defects in displays to determine repair, reject, or accept actions

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Guide to CCD-Based Imaging Colorimeters

Selecting the right CCD-based imaging colorimeter requires understanding a few basic trade-offs in imaging colorimeter architecture. This guide will help you determine right configuration for your needs.

In this White Paper, you will learn about:

  • CCD technology
  • Noise reduction and types of noise
  • Color accuracy related to filters
  • Types of measurement errors and their causes
  • How to choose the best imaging colorimeter for your application

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Automated Solutions for SAE Standard HUD Measurement

This paper introduces methods for meeting the requirements of the new SAE J1757-2 standard and outlines the advantages of automated measurement systems.

In this White Paper, you will learn about:

  • The SAE (Society of Automotive Engineers) new standard for measuring HUDs: SAE J1767-2
  • Advantages and disadvantages of current SAE-compliant HUD measurement systems
  • Automated Alternatives to current test methods: imaging colorimeters and photometers
  • How automation simplifies SAE measurement criteria

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How to Use Imaging Colorimeters to Correct OLED, MicroLED, and Other Emissive Displays for Improved Production Efficiency and Yields

The application of imaging colorimeters improves OLED and microLED display production by ensuring visual quality of displays—measuring brightness and color uniformity at the pixel and subpixel level to correct poor quality displays and safeguard manufacturing investment. An imaging colorimeter system is one very important component in manufacturing processes that boosts efficiency and yields in display production, ensuring optimal price/performance.

In this White Paper you will learn about:

  • Manufacturing challenges of OLED and microLED technology
  • Applications of imaging colorimeters in emissive display measurement and manufacturing
  • The process of "demura" for display measurement and correction
  • How correcting emissive displays improves yield and supports market growth

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