FPD Conoscope Lens

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The Radiant Vision Systems FPD (flat panel display) Conoscope Lens enables high-resolution photopic measurement of the angular distribution of color, luminance, and contrast for displays and display components. Radiant uses Fourier optics that map an emitting spot to an image sensor so that each pixel corresponds to a different emission angle. The FPD Conoscope Lens captures a full cone of view angle data in a single measurement to ±70 degrees. This provides quick, accurate results, making the system ideal for both R&D projects and in-line production quality control. The lens is well-suited to evaluate a wide range of FPD types including those based on LCD, OLED, and backlight technologies.

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  • Accurate, reliable measurement of luminance, chromaticity, and contrast to ±70° view angle
  • Faster than goniometric systems, capturing data for all angles simultaneously
  • Easily paired with ProMetric imaging colorimeters or photometers
  • Combination of low cost, high performance, and flexibility, designed for R&D and quality assurance labs
  • Easy-to-use measurement control and analysis software


Parameter FPD Conoscope Lens
Application View angle measurement
Working Distance 3 mm
Minimum Sampling Area (uniform emission) 15 mm diameter
View Angle ± 70°
Resolution 0.05° / sensor pixel (29MP) 0.03° / sensor pixel (45MP) 0.03° / sensor pixel (61MP)
Luminance – Minimum 0.01 cd/m2
Luminance – Maximum 3,000 cd/m2 (Y-series); 30,000 cd/m2 (I-series*)
System Accuracy** 0-60° Inclination
Luminance (Y) ± 4%
Color Coordinates (x,y) ± 0.004
60-70° Inclination
Luminance (Y) ± 5%
Color Coordinates (x,y) ± 0.007
Measurement Capabilities*** Luminance, Radiance, Angular Contrast, CIE Chromaticity Coordinates,
Correlated Color Temperature (CCT)
Units*** cd/m2, nit, W/sr/m2, foot-lambert, CIE (x, y) and (u’, v’), Kelvin (CCT)

* Based on ND1 configuration for I-series. For higher luminance sources, contact Info@RadiantVS.com.
** Accuracy dependent on spectrum under test and color calibration methods applied
*** Color measurement available with I-series cameras only

Specifications subject to change without notice. If there are any discrepancies between these specifications and the specifications shown in the PDF Product Spec Sheet, the product Spec Sheet is considered correct.

Compatible Products:

  • ProMetric Y Series Photometers: Y45, Y61
  • ProMetric I Series Colorimeters: I29, I45, I61. I61-SC

System Recommendations:

  • ProMetric Imaging Photometer or Colorimeter (29MP or higher)
  • TrueTest™ Software
  • Windows® 10, 64 bit
  • 16-32 GB RAM
  • Additional system requirements vary by camera.

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