Near Eye Display Measurement System

The Gamma Scientific Near Eye Display (GS‐1290 NED) measurement system is designed to accurately capture spectral measurements of Virtual Reality, Mixed Reality, Augmented Reality and Helmet mounted displays as viewed by the human eye.

It is unmatched by any other instrument available in measuring the essential NED performance requirements by combining:

  • Telescope optics compact enough to fit inside a helmet and designed to point in different directions to emulate the  movement of the human eye
  • Gamma Scientific’s GS-1290 detector-based grating spectroradiometer with high sensitivity design using single or double stage TE cooled multi-element back-thinned CCD

The NED Measurement System leverages decades of experience developing Display and HUD test systems for military aircraft programs including the F-16, F-18, B-1B, F-117, C-17 and F-35.

Measurement Applications
  • Luminance and color uniformity
  • Symbology luminance and color
  • Spectral transmittance
  • Left/right eye parallax
  • Image contrast with different background Spatial Power Distributions (SPD)
  • Transmittance modulation contrast (IDMS 7.2) for Augmented Reality
  • Virtual image modulation contrast (IDMS 7.2) for Augmented Reality/Virtual Reality
  • Display response time/Flicker

Near Eye Display Measurement System Requirements

The Entrance Pupil of the measurement telescope must be positioned in the rotational area of the human eye (Design Eye Box).  The pupil diameter is 5mm for Near Eye Display applications. Relative to most display testers with Entrance Pupils of 20-40mm, 5mm reduces light by 16-64 times highlighting the critical requirement for the spectrometer to accurately measure extremely low light levels, an industry-proven strength of Gamma Scientific’s GS-1290 spectroradiometer.

The NED measurement system must be able to point in different directions to different areas in the Virtual Image Field of View.  The axis of rotation for the measurement optics must be within the Design Eye Box to emulate the perspective of the human eye.

Auto-focus System for NEW Telescope

  • The Auto focus system includes hardware and software to focus the virtual image. It also determines and reports the virtual image distance. The focus range is infinity (autocollimated) to 1 meter virtual image distance. The virtual image distance is reported in 1 meter increments from 1 to 10 meters and infinity beyond 10 meters.

Dual Field of View Aperture

  • Allows manual selection of either 1 degree of 2 degree aperture for circular area spectroradiometric measurement of the virtual image. Includes the GS-DMS software capability that can automatically select the corresponding calibration file for the aperture selected.

4mm Entrance Pupil Reduction Kit

  • This kit includes a 4mm diameter entrance pupil and field lens system to maintain optimum coupling to the spectroradiometer.

3mm Entrance Pupil Reduction Kit

  • This kit includes a 3mm diameter entrance pupil and field lens system to maintain optimum coupling to the spectroradiometer.

1mm Entrance Pupil Reduction Kit

  • This kit includes a 1mm diameter entrance pupil and field lens system to maintain optimum coupling to the spectroradiometer.

Flicker Sensor Option

  • High speed photosensor in the image plane (5 degrees off axis) allows for the determination of response time and latency characteristics of the display under test.

Response Time Option

  • Software module to acquire and report the response time metrics of the display virtual image. Reports rise time and fall time per ICDM Section 10.2.2. Requires the Flicker sensor option.

Latency Option

  • Software module to acquire and measure the time for the display to respond to an input signal, including any processing-induced latency, or the time for the luminance for the display to turn on from the time it is triggered to do so. The measurement is made from the trigger time until the time the luminance reached 50% of the full luminance at the center of the screen. The reported result is an average over multiple measurements and is reported as the video latency of the display virtual image. Requires the Flicker sensor option. Since the specific configuration of the trigger signal is different for each display technology and video drive signal configuration, engineering evaluation and Factory Quotation for each customer is required.

 

Modular Design Controlled by Programmable Software

Data Sheet (PDF)

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White Paper (PDF)

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Related Products:

GS-1290 RadOMA Spectroradiometers

  • High sensitivity design using single and double stage TE Cooled Multi Element Back-Thinned CCD sensors
  • Backed by over 40 years of knowledge and continuous improvements in spectroradiometer design
  • Proprietary optics design and Back-Thinned CCD provides exceptionally low stray light performance for measurement accuracy

 

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