Multi-primary color display device

A multi-primary color display device comprising:

• a multi-primary color display panel including a pixel that is defined by a plurality of sub pixels including a red sub pixel, a green sub pixel, a blue sub pixel, and a yellow sub pixel;
• and
• a signal converting circuit converting a three-primary color image signal corresponding to three primary colors into a multi-primary color image signal corresponding to four or more primary colors,
• in a case where a three-primary color image signal representing at least an achromatic color of a half tone is input, the signal converting circuit performs a signal conversion such that variations in luminance levels of the plurality of sub pixels are equalized;
• in a case where a three-primary color image signal representing an achromatic color of a 128/255 gray scale is input, the signal converting circuit performs a signal conversion such that a root mean square value of differences between an average luminance level of the plurality of sub pixels and luminance levels of the plurality of sub pixels is 0.023 or less;
• and
• the signal converting circuit includes independent gamma processing circuitry that independently performs a gamma processing for each of the plurality of sub pixels.