idea 11 years ago. A type of computer screen, that does not produce light, but reflects light, and in full sunlight would be the brightest and most colourful, being able to utilize the full spectrum of the sunlight. Millions, or even trillions, of tiny mirrors, each one able to be controlled by a computer, with electrical pulses individually to move slightly to reflect certain pairs of wavelengths of light outwards at an angle so that the two waves cross in mid-air and interact, to create a hologram. The best way would be to have a glass sphere, where every crystal structure lattice is a pixel that is formed specifically when the glass was liquid,
using sound waves to vibrate it into a certain pattern to form cells within the structure of the crystal lattice. The computer to control it can mathematically imagine a three dimensional space to represent the glass sphere, and is a map to direct electrical pulses at a certain crystal cell to create a specified colour change when light is shone through, as a filter on each crystal structure of the glass, to create pixels. You could shine light through the sphere from the sides or put a light source in the middle, or both to interact with the two light sources as two factors in programming. Many ways.