Westboro Photonics

The all-in-one production tester for displays, lighting, and more

The WP512 is a unique imaging colorimeter integrating a 12 MP camera and an internal reference spectroradiometer.

Consistently beautiful displays and lighting require accurate and precise measurement equipment on the production line. The WP512 has superb performance without the hassle and cost of multiple discrete instruments. Everything needed is in one compact package with one power connection and one GigE connection.

All display types and sizes

With a wide assortment of lenses available, from microscope objectives to wide-angle, the WP512 is configurable for measurements of any display size, from microdisplays to smartwatches, tablets, TVs, or cinema walls.

The WP512 features industry-standard EF-mount lenses.  The system supports electronic or manual lenses from 24 to 100 mm focal length, plus fixed microscope lenses up to 10X magnification.  In addition, our unique CONOMETER® Viewing Angle Lens for measurements out to +/-80 degrees and Near Eye Display (NED) Lens for analysis of augmented reality (AR) and virtual reality (VR) applications are also available.

Partial screenshot of Photometrica® software showing example of 2D luminance image of a smartphone display, and corresponding spectral data from the measurement spot calibrated to the optical axis.

AR/VR display testing

The periscope XR1 Near Eye Display (NED) Lens provides optimal test performance for displays up to 60 degrees horizontal or vertical field of view (FOV). The periscope design ensures the lens readily fits into the final assemblies of glasses, headsets, and helmets. Under different stimuli, human visual accommodation results in varying pupil diameters. For that reason, the entrance pupil aperture is adjustable from 1.5 to 5.0 mm.

XR1 NED Lens with WP512 Imaging Spectral Colorimeter

Distortion corrected

With the available Distortion Package, a menu-driven registration and distortion correction assistant allows users to correct for lens distortions. Once the correction is applied, any distortions in the display under test are revealed and can be analyzed.

Viewing angle

The Conometer® lens enables viewing angle measurements of flat panel displays and backlights. In addition, the system provides 0.05 degrees resolution and 0.0001 cd/m2 sensitivity. 

Conometer Lens with WP525 Imaging Spectral Colorimeter

Spectral performance

The integrated, low noise CMOS spectrometer is optimized for high performance color measurements at a reasonable cost. The combination of low optical stray light and high dynamic range using exposure time stacking enables superb color measurements.

HeNe laser spectrum plotted in log scale showing <1E-4 stray light

Measurement principle

The instrument design optimizes throughput and sensitivity by sending all the light to either the camera or to the spectroradiometer – resulting in significant takt time improvements when low light measurements are required.

Key to the WP512’s unique capability is the high-speed linear translation stage. The stage has multiple positions for imaging light with the RGB camera or with the spectroradiometer. In addition, optional filtering is available up to ND1 in the RGB camera path or ND2 in the spectrometer path. Low luminance measurements are crucial for takt time optimization in many production scenarios. Having higher throughput, the WP512 is two times faster at the bottleneck measurements than comparable beam-splitter solutions that share the light with two or more focal planes.

The neutral density filter options accommodate a wide range of light measurements. Users can measure very bright scenes; or attenuate to increase the optimal exposure time. For example, although the camera and spectrometer can have sub-millisecond exposure times, a display modulated at 30Hz may be best measured at exposures of 33.3ms. 

Additionally, the method has very low polarization dependence and minimal chromatic and geometrical distortion – both critical parameters of measurement accuracy.

Conveniently, when the camera is imaging, the spectrometer is shuttered and vice-versa. In this way, frequent dark measurement correction is available in production without affecting takt time.

The fiber is fixed and the stage moves left to right. At top an ND1 is in front of the imager. Middle, no ND in front of the imager. Bottom a prism deflects light to the fiber.

Measurement Applications
  • Flat panel displays
  • Near eye displays
  • Lighting
  • LED arrays
Key Features
  • 12.3 MP imaging
  • Integrated reference spectroradiometer
  • 0.001 cd/m2 sensitivity
  • Independent ND filters for camera andspectroradiometer
  • Low polarization
  • Automatic dark measurements
  • EF lenses
  • No beam splitter
Specialized Software Packages