Articles

There are two measuring procedures for determining the photometric and colorimetric values of light radiation: One is the integration method based on a photometer or imaging colorimeter. The other one is the spectral resolution method based on a spectroradiometer. Their advantages and disadvantages are detailed discussed in this article.

Today, displays are taken for granted in our everyday lives – unless they fail to function correctly or were falsely specified for an application. How can the quality of a display be objectively assessed, and by which methods and technology can it be analyzed and improved?

The brightness and color reproduction of a flat panel display is factory calibrated. For economic reasons this should take place in an automated process at the production stage. Spectroradiometers enable precise photometric and colorimetric measurements, and are fast enough for use in production.

Modern Solid State Lighting (SSL) technology has long since found its way into our normal working and living environments. In the early phases, consumers were most concerned with lifetime, pricing and light quality of the new LED-based light sources. Now they have become almost ubiquitous, a focus has been placed on safety. At the recent Light+Building exhibition topics such as photobiological safety and blue light hazard (BLH) were highly ranked among both visitors and exhibitors.

In the LED manufacturing process electrical, optical and thermal measurements are performed on the production line itself, to sort the LEDs in quality groups and to separate defective from high-grade production.

Optical measurements in LED mass production must be fast and precise. Various methods can be used in the individual production stages, in order to produce reliable results.

For the third consecutive year, Instrument Systems invited engineers from all industries that deal with light measurement of SSL products and different kinds of displays to their seminar. LED professional’s Editor in Chief, Arno Grabher-Meyer, was also pleased to receive (and accept) an invitation. In this article he shows what attendees can expect, who might find this event of interest, who would benefit the most and who should definitely not miss the next opportunity to attend.

Display metrology is crucial in order to obtain objective characteristics that specify the performance of such displays as a basis for purchasing decisions. The usability of displays for a certain application can be estimated on the basis of performance features obtained from standardized display measurements. In the R&D activities of companies that are manufacturing displays and products with displays, display metrology is necessary to obtain performance specifications for systematic product optimization.