Display screen image colors that are supposed to be the same should appear the same at different locations on the screen.
Additional Information: Color uniformity refers to how well the color remains constant over the surface of the screen. When a color is intended to be uniform over a certain area of the screen image, the chromaticity differences of that color in color space, Du’v’, at different locations in that intended image area, should be a maximum of 0.03 in general, and a maximum of 0.02 within any area subtending less than 35 percent of visual angle. See IDMS (2012) for measurement information.100