Method and apparatus of multi-modal illumination and display for improved color rendering, power efficiency, health and eye-safety

A system, comprising:

• an electronic display comprising an array of light reflecting-absorbing pixels arranged on a viewing surface of the display;
• a frontlight assembly projecting an illuminating light onto the pixels on the viewing surface of the display, the frontlight assembly further comprising:
• at least one light emitting diode (LED) package within the frontlight assembly,
• wherein the at least one LED package contains both a first and a second excitation source together, or wherein the at least one LED package each separately contains either:
• a first excitation source, or a second excitation source;
• wherein the first excitation source has a dominant wavelength within a blue range;
• wherein the second excitation source has a dominant wavelength within a cyan range;
• wherein excitation light intensity produced from the first and second excitation sources is determined by electrical control of LED junctions forming the first and second excitation sources;
• wherein a light spectrum produced from the first and second excitation sources is a combination of an excitation source waveband and an excitation-emission characteristic of a photoluminescent material located in an optical path between the first and second excitation sources and the viewing surface;
• and
• wherein the light spectrum of the at least one LED package, operated individually or in combinations, is selected based on light spectral absorption properties of the pixels of the display, and one or more desired characteristic light spectral reflectance from the pixels of the display;
• and
• a frontlight controller configured to electrically control a selection of the first and second excitation sources, to a desired combined spectrum of light cast onto the pixels of the display,
• wherein the frontlight controller responds to adjust the desired combined spectrum of light based on at least one characteristic selected from a set of preferred characteristic-responses.