Pro Lite Technology

FPMS Near-Field Goniophotometer for Testing Displays

Radiant Imaging PM-FPMS Near-Field Goniophotometer for Displays

View angle performance for flat panel displays

The PM-FPMS from Radiant Imaging combines a motorised goniometer stage with a ProMetric CCD imaging photometer to perform a near-field angular analysis of the luminance and colour from flat panel displays. PM-FPMS employs a ProMetric CCD imaging photometer to record spatially-resolved images of the near-field luminance emitted from the display. Spatially-resolved images of the source luminance are recorded for one angle of azimuth and elevation at a time. The associated, motorised goniometer stage scans the device under test over ± 88° in all directions.

The Imaging Photometer Difference

The PM-FPMS system performs brightness and colour uniformity measurements as a function of viewing angle for flat panel displays. It is designed to provide accurate view angle performance measurement data for developers of LCD, PDP, OLED and LED displays, as well as of LED, CCFL and lamp-based backlights. Because the PM-FPMS system captures a full image of the display or component at each measurement angle, it provides much more comprehensive information than can be obtained from traditional spotmeter-based measurements.

Radianyt Imaging's PM-FPMS Near-Field Goniophotometer for Displays

Goniometer Frames for Small, Medium & Large Displays

The PM-FPMS goniometer frame is available in three sizes to accomodate different sizes of displays. The maximum size and weight of the device under test determine which goniometer frame you will need. The minimum sample size that a frame can accomodate is determined only by the field-of-view of the ProMetric imaging photometer and this can be selected through appropriate choice of lens.

The ProMetric CCD Imaging Photometer/Colorimeter

ProMetric imaging photometers are available with a range of sensitivities and CCD pixel resolutions, from 10-bit to 16-bit (the ability to resolve from 1,024 to 65,536 levels of brightness) and from 512 x 512 up to 3,072 x 2,048 pixels. Interchangeable lenses are available to match the field-of-view of the imaging photometer to the size of the device under test. ProMetric software for the imaging photometer is also included which allows for the measurement of spatial luminance and colour.

Fully Automated Measurements

The PM-FPMS control and analysis software provides full control over both the ProMetric imaging photometer and the FPMS goniometer, allowing definition and execution of a fully automated measurement sequence. The measurement data is preserved as a set of display images, capturing an image of the display or component at each viewing angle that is useful for isolating anomalous performance results.

The PM-FPMS system software supports display performance analysis through an extensive variety of quantitative analyses. Analysis tools include isoplots, CIE colour plots and radar plots for any sampling area size and view angle. These tools eliminate the effect on the view angle measurements of the display as the imaging photometer views the display at increasing angles. Software corrects for the increase in measurement spot size as the display rotates which eliminates a major source of error associated with spotmeter-based measurements.

In addition, the PM-FPMS system can perform mura defect detection at any view angle. In contrast, view angle measurements based on either a scanned spot detector or a Fourier lens system (such as a conoscope), can only provide data for a single spot size, and do not readily provide data on display spatial uniformity.

Specifications & Ordering Information

Goniophotometer Frames




Max. Sample Size (mm)

500 x 380

865 x 535

1325 x 760

Max. Sample Diagonal (mm)




Max. Sample Weight (kg)




Goniometer Size (WxDxH, mm)

900 x 360 x 600

1200 x 750 x 770 1200 x 800 x 1800
Operating Footprint (mm)

970 x 970

1400 x 1400

1780 x 1780

Approximate Weight (kg)




Operating Range, Azimuth

± 88°

Operating Range, Elevation

± 88°

Angular Precision



220V, 50Hz

System Configuration  

FPMS Goniometer Frame

FPMS-0400, -0800 or -1500

ProMetric Imaging Photometer

The PM-FPMS is compatible with any
ProMetric CCD imaging photometer / colorimeter

Recommended Photometers

PM-1453F-1 or PM-1423F-1


Cooled CCD with internal RGB & ND filter wheels

   Pixel Resolution

768 x 512 or 1536 x 1024, full frame transfer

   Dynamic Range

14 bits (16384:1)

   Photometric Range +

0.01 ... 100,000 cd/m2

   Spectral Response

CIE 1931 2° tristimulus observer (XB filter optional)


Lens dependent

Software Supplied

ProMetric PM 9.x, PM-FPMS

Choice of Lens(es) ++

8 ... 300mm, Nikon compatible

Calibration(s), NIST-Traceable

Luminance (cd/m2)


Standard CIE illuminant A / D65 colour corrections

Accessories Included

Heavy duty tripod with 3-axis geared head

Services Included

On-site installation & operator training


Software & technical support licence, 12months


Dark room


Computer, PC


Table or support structure for goniometer frame

Measurement Parameters

vs. J, f

   Axial Luminance

Lv (cd/m2)

   CIE Chromaticity 

xy, u'v'

   CIE Tristimulus


   Correlated Colour Temperature

CCT (Kelvin)

   Colour Difference 


+   Photometric range quoted is approximate and depends upon the spectral power distibution of the sample.
++ One lens and lens calibration is included with the goniophotometer system. Please consult Pro-Lite for assistance
     with lens selection.

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