Rotating Light Source for Uniform Illumination on Reflective Displays

The patent applies the dynamics principle by making the light source movable through a rotating assembly. The light source rotates around an axis parallel to the display panel, dynamically changing its position and illumination angle. This dynamic movement allows the light to scan across different regions of the display panel, distributing illumination more uniformly and preventing localized over-illumination near the light source position.

The patent implements periodic action through the continuous rotation of the light source assembly. The light source periodically scans across the display panel surface, creating a time-averaged uniform illumination effect. The rotation frequency is controlled to be above the human eye's critical fusion frequency, ensuring the periodic motion is not perceived as flicker while achieving uniform luminance distribution.

The light source is mounted on a rotating assembly that allows it to dynamically change its position relative to the display panel. As the assembly rotates, the light source moves along a circular path, continuously varying the incident angle across different regions of the panel. This dynamic angular variation ensures that no single region receives consistently excessive or insufficient illumination, achieving uniform luminance distribution.

The patent introduces rotational motion as an additional dimension of control. Instead of positioning the light source at a fixed location, the system adds a rotational degree of freedom, allowing the light source to access multiple spatial positions and angles. This dimensional expansion transforms a single-point illumination problem into a distributed multi-angle illumination system, achieving uniform coverage across the display panel.