Abstract: Rotary shutter assemblies for imaging photometers and methods for using such shutters are disclosed herein. In one embodiment, for example, a method for capturing an image with an imaging photometer can include positioning a rotary shutter having an aperture at a first position such that the shutter blocks light traveling along an optical axis from a light source being measured to an image sensor of the photometer. The method can include pivotably moving the shutter at a generally constant angular speed to a second position with the aperture aligned with the optical axis to expose at least a portion of the image sensor to the light for a first predetermined exposure time.

Abstract: Systems and methods for measuring spatial and angular performance of a visual display are disclosed herein. In one particular embodiment, for example, a method for measuring spatial and angular performance of a flat panel visual display includes capturing a plurality of image measurements from a visual display at a plurality of different view angles. The method also includes selecting one or more points of interest on the visual display, and calculating tristimulus values (X, Y, Z) for each point of interest at each of the plurality of view angles. The method further includes generating a view angle performance plot for the one or more selected points of interest.

Abstract: A lightguide illumination system is disclosed for providing more improved and efficient technology for capturing light from an extended light source having a relatively high aspect ratio, and coupling that light into a plurality of lightguides. The inventive systems functions by dividing the length of the extended light source into shorter segments, so that the aspect ratio of the light source can be more closely matched to the aspect ratio of the lightguide. In the preferred embodiment, a plurality of interleaved trough reflector segments are employed to segment the length of the light source. This enables the coupling efficiency of the total system to be greatly improved.