I'd suggest looking at the FAA AC-25 and AC-29s - the guidance material for Certification of Large Aeroplanes and Rotorcraft. A sample from AC-29 extracted below:
(2) Symbology and Function.
(i) When assessing the acceptability of the EFIS, consideration should
be given to the effect of the loss of one of the CRT color guns. This type of failure is especially a factor in determining the acceptability of the installation for single-pilot operation.
(ii) Symbols should be distinctive to minimize misinterpretation or
confusion with other utilized symbols utilized in the displays. The type and function of symbology should be clearly defined and appropriately classified for pilot understanding. Symbols representing the same functions on more than one display should utilize the same shape and/or color-coding.
(3) Display Chromaticity and Luminance. The chromaticity and
luminance of the displays should be determined to be acceptable for all cockpit lighting conditions which are expected in service. An expanded discussion of thesecharacteristics may be found in AC 25-11.