Conoscope Lens for Viewing Angle

Radiant Vision Systems, Test & Measurement

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The Radiant Vision Systems conoscope lens enables high-resolution photopic measurement of the angular distribution of color, luminance, and contrast of displays and display components. Fourier optics map a light-emitting spot on a display to the connected camera’s CCD so that each pixel corresponds to a different emission angle. This enables the conoscope lens to capture a full cone of viewing angle data in a single measurement to ±60 degrees for quick, accurate results. The conoscope lens features an angular resolution of 0.06 degrees per CCD pixel. Paired with the 16-megapixel ProMetric® I16 Colorimeter or Y16 Photometer, the conoscope lens has the capability to measure luminance, radiance, angular contrast, CIE chromaticity coordinates, and correlated color temperature (CCT) with a high degree of accuracy at each viewing angle. The lens is well-suited to a wide range of display types including those based on LCD and OLED technologies, as well as backlights.

The conoscope lens solution acquires viewing angle measurements with reduced hardware size and complexity compared to typical goniometric measurement systems for R&D applications, and can be purchased for a fraction of the cost of alternative solutions. Because of its speed and compact form factor, the conoscope lens solution is also ideally-suited for in-line inspection of displays during production. Radiant TrueTest™ Software is used to perform real-time pass/reject operations based on display viewing angle performance data, eliminating poor-quality components from the line and identifying quality trends before significant loss of materials. Applying the conoscope lens solution concurrently in R&D and production environments further allows manufacturers to capture identical measurements of viewing angle data for seamless evaluation of displays throughout an entire product lifecycle, from initial characterization to quality control. If additional data is needed, the lens can easily be swapped with Radiant’s standard lens options to perform 2D display measurements as well.

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