Artificial muscles may enable more lifelike color displays

RGB gamut. The oval-shaped region represents the entire color space that human eyes can perceive, with the "pure," or spectral, colors on its boundary. Inside, the triangle represents the color space that can be reproduced by mixing red, green, and blue, with the three fundamental colors at its vertices. Since this image is itself encoded in the RGB channels, the colors outside the triangle are not faithfully reproduced. Displays based on diffraction gratings could instead faithfully reproduce the entire gamut of visible colors.