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Measuring Screen Colour

Sep 2008
Admesy BVRequest Info
•   18,000 luminance measurements per second
•   0.05 to 7500 cd/m2
•   production mounting and interfacing

Admesy.jpgThe Brontes colorimeter from Admesy BV is designed for integration into the production environment for measuring plasma screens and LEDs, and LCD displays in monitors and hand-held devices. Such measurements enable white point adjustment, gamma correction and flicker trimming of the screen.

The colorimeter makes 18,000 luminance measurements or 5500 colour measurements per second. It has a 3.3-V compliant trigger input to synchronize with in-line events, plus four 3.3-V general-purpose input/output lines for control interfacing. The sensor is a silicon photodiode with X-Y-Z interference filters approximately following the CIE 1931 colour-matching functions and simulating the sensitivity of the human eye. The filters provide long-term stability over time and temperature, and consistency between devices. Luminance measurements from 0.05 to 7500 cd/m2 have an accuracy of ±4% of measured value and a repeatability of ±0.1%. Chromaticity (x,y) values have an accuracy of ±0.001 at the equal energy point.

The instrument is small, measuring 100 × 50 × 50 mm, and has a 1/4 BSW mount and M4 thread holes. It makes measurements directly through its enclosed lens system with a 2° or 6° field of view, or via an optical fibre probe connected to the SMA fibre adaptor.


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