ISMS-30-VAS

With the ISMS-30-VAS we offer a product series which allows dual use for reflection measurements on flat, convex and concave displays and annulus design measurements for separating specular, haze and lambertian reflection.

Technology of the Sampling Sphere and Annulus Aperture Method

There are two main papers which introduced this technology:

• Reflection Measurements and Uncertainties Using Sampling Spheres on Flat, Convex, and Concave Displays by Edward F. Kelley, Dirk Hertel, John Penczek and Paul Boynton 
• Combining Annulus and Variable Aperture Source Methods to Separate Specular, Haze and Lambertian Reflection Components of ePaper Displays by Dirk Hertel and John Penczek*

The ICDM Information Display Measurements Standard (IDMS) section 11 describes how to use such a sphere, see IDMS section 11.7.3.2.

Design of the ISMS-30-VAS

The ISMS-30-VAS is based on a 300 mm integrating sphere with two LED based light sources for best uniformity. Furthermore, an additional port is available if a reference sensor is needed (optional). There are on both sides port adapters for making the annulus method and sampling sphere method available. For the measurement of displays with different curvatures (concave, convex, flat, different angles, etc.) individual port adapters are available. These are fixed on the sphere by magnetic holders for best reproducibility.

Reflection Measurements Using Sampling Spheres on Flat, Convex, and Concave Displays

A sampling sphere was made commercially available to measure hemispherical diffuse reflection on flat and curved displays. Interchangeable sample ports eliminate the gap between sample port and convex or concave displays. This setup has been compared in the mentioned scientific paper to large integrating spheres.

Combining Annulus and Variable Aperture Source Methods to Separate Specular, Haze and Lambertian Reflection Components

The annulus light source method separates specular and diffuse components of reflected glare from display surfaces. Combining it with the variable aperture source method delivers source-size dependence. Measuring diagnostic reflection samples and ePaper with mirror-like or scattering surfaces confirmed that the source- size dependence of reflected glare comes from haze scatter.