US Patent 10295721 Adjustable color temperature illumination

Various approaches discussed herein enable techniques for adjusting color temperature value of illumination, for example with regard to electrophoretic ink display screens. A plurality of one type of LEDs are positioned along an injection line of a light guide panel, and are interleaved with a plurality of another type of LED positioned along the injection line. By controlling the current supplied to each group of LEDs, a color temperature value of light directed onto a display screen from the light guide panel may be adjusted to remove or reduce blue aspects.