In today’s automobiles, versatile high-resolution touchpads have replaced analog gauges and knobs. Modern smart lighting adjusts to changing conditions. Radios have been replaced with multi-function, touch-sensitive infotainment displays. Generic sealed-beam and capsule headlamps have been superseded by stylish, aerodynamically-efficient, model-specific LED and HID headlamp assemblies. Head-up displays (HUDs) are becoming an automotive standard.
Radiant Vision Systems presents a complete portfolio of measurement solutions to increase design efficiency and control production costs of automotive displays, lighting systems, and illuminated symbols. Radiant's fully-integrated measurement systems are helping automakers and suppliers worldwide improve their R&D, quality control, and production operations.
Embedded LCD and OLED Displays
Instrumentation, information, navigation, and entertainment systems are all moving to display technology. Expectations for color and clarity of these displays are high, based on consumer experience with TVs, computers, and phones. A perfect display is critical to the purchase decision and long-term customer satisfaction. Human inspection cannot accurately and efficiently detect display faults. Automated display inspection for luminance, chromaticity, uniformity, line / pixel defects, and mura can prevent “escapes” and ensure a ensure a perfect end-user experience. Radiant’s integrated inspection solutions, using a ProMetric® Imaging Colorimeter or Photometer and TrueTest™ Automated Visual Inspection Software, can perform automotive-specific inspection applications, including testing per the German Automotive Black Mura Standard.
White Paper: How to Use Imaging Colorimeters for Automated Visual Inspection of Displays
Presentation: Automated Visual Inspection for Automotive Flat Panel Displays
Presentation: Mura and Defect Detection with TrueTest
Instrument Clusters, Controls, Tell-Tales, & Indicators
Illuminated Symbol Testing
A ProMetric system comprised of an imaging colorimeter and ProMetric Software is a simple and accurate solution for testing illuminated characters. The software features a powerful tool (Auto-POI, or Automatic Points-of-Interest) that allows users to automatically select points of interest based on location or color and luminance values (Lv and CIE x,y thresholds). Calculations can then be run on a single character, or a group of like-characters, to ensure uniformity within or between symbols regardless of location, shape, size, or color. The Auto-POI system provides comprehensive data through ProMetric Software, including average luminance across characters, points of minimum and maximum luminance, color value, and dominant wavelength.
A Radiant system can be indispensable in headlamp evaluation applications, particularly as they grow in complexity. Today's smart headlamps benefit from multiple measurements to ensure proper illumination at all settings. An effective and efficient method for evaluating headlamp performance is to project the light source onto a prepared flat surface, where the imaging colorimeter captures the illumination distribution in a single measurement. The assembly can then be analyzed on a number of user-defined criteria using the PM-HL™ Headlamp Evaluation Module, designed specifically for headlamp evaluation.
PM-HL functions include:
- Light source illuminance distribution measurement
- Evaluation of ECE and SAE Regulation test points
- Evaluation of custom test points
- Evaluation of beam pattern cut-off gradients
- Conversion to luminous intensity distribution
- Conversion to roadway illumination distribution
- Data analysis functions, including bitmaps, isoplots, and cross-sections
An alternative method of establishing an illumination distribution, ideal for new LED-based luminaires, is to measure the near-field distribution of a source. The luminaire is mounted on a goniometer while an imaging colorimeter, driven by automated measurement control and analysis software, measures luminance or lit-appearance at all view angles. The far-field luminous intensity distribution is calculated via software. The illuminance distribution can then be calculated for any arbitrary distance.
Quality control for LED headlamps, taillights, and accessory light strips can be readily addressed with a ProMetric Imaging Colorimeter and ProMetric Software. Luminous intensity distribution may be determined, uniformity of luminance and color may be measured, and failed LEDs in the cluster may be detected. ProMetric Software allows ROIs (regions of interest) to be overlaid on the image and individual LED performance to be determined.
Head-Up Displays (HUDs)
Head-up displays (HUDs) pose unique measurement challenges for manufacturers, who must take into account potential luminance changes on an infinite plane. ProMetric imaging colorimeters and photometers feature an electronically-controlled lens that is highly effective at identifying and focusing on an image projected into infinity. This enables ProMetric analysis software to provide accurate luminance and chromaticity measurements at any working distance.
Small Light Sources
Light Source Characterization
Small light sources, such as bulbs or LEDS, may be characterized by a near-field model for use in optical design applications. To create this model, a precision goniometric system (SIG-400 Source Imaging Goniometer®) with a ProMetric Imaging Colorimeter takes measurements of luminance and color of the light source from multiple viewing angles. The measurement output is a Radiant Source Model™ (RSM) file that describes the near-field luminance distribution around the source. This RSM is supported by all major optical/illumination design software packages, and is converted to a ray set using Radiant ProSource® Software. These ray sets support optical design, and also the extrapolation of a near-field model into a far-field model.