As others have mentioned, this is very much a safety issue and very much worth asking!
Fortunately, user experience in vehicles has a long history of study and standardization. SAE International, formerly the Society of Automotive Engineers, has published a number of standards and papers related to this issue. Here are some that may be relevant:
http://standards.sae.org/j2831_201204/ Development of Design and Engineering Recommendations for In-Vehicle Alphanumeric Messages.
This Information Report provides recommendations for alphanumeric
messages that are supplied to the vehicle by external (e.g.,
infotainment system) sources while the vehicle is in-motion.
Information/design recommendations contained in this report apply to
OEM (embedded) and aftermarket systems.
Ergonomic issues with regard to display characteristics (e.g., viewing
angle, brightness, contrast, font design, etc.) should review ISO
http://standards.sae.org/j2217_199110/ Photometric Guidelines for Instrument Panel Displays That Accommodate Older Drivers.
Physical parameters that influence the legibility of an instrument panel display include letter/graphic size, the luminance and color difference between graphics and background, the observer's luminance adaptation level, and the level of glare present. Several aspects of visual functioning deteriorate as part of the normal aging process. These include a reduction in luminance and color contrast sensitivity, an increase in sensitivity to glare, a reduction in visual accommodation capacity, and a reduction in the sensitivity to light. This SAE information Report provides introductory information that should be considered when setting photometric guidelines for instrument panel displays that are designed to accommodate the older driver
http://standards.sae.org/arp4032b/ Human Engineering Considerations in the Application of Color to Electronic Aircraft Displays.
This document is intended for the application of color to
cathode-ray-tube (CRT) displays, liquid crystal displays (LCD) and
other types of display technologies such as projection displays.
Emerging color display technologies other than those noted above, may
not be adequately covered by these recommendations.
Color recommendations will not address Night Vision Devices (NVD),
Head-Up Displays (HUD) or Head or Helmet Mounted Displays (HMD).
This document is applicabel to aircraft as understood in 14 CFR Parts
23, Part 27 and Part 29, and EASA CS-23, CS-25, CS-27 and CS-29
Others that may be of interest:
http://standards.sae.org/j2365_200205/ Calculation of the Time to Complete In-Vehicle Navigation and Route Guidance Tasks.
This SAE Recommended Practice applies to both Original Equipment Manufacturer (OEM) and aftermarket route-guidance and navigation system functions for passenger vehicles. This recommended practice provides a method for calculating the time required to complete navigation system-related tasks. These estimates may be used as an aid to assess the safety and usability of alternative navigation and route guidance system interfaces to assist in their design. This document does not consider voice-activated controls, voice output from the navigation system, communication between the driver and others, or passenger operation.
http://standards.sae.org/j1663_199508/ Truth-In-Labeling Standard for Navigation Map Databases.
This SAE Standard is a truth-in-labeling standard for map databases.
http://standards.sae.org/arp4102/ Flight Deck Panels, Controls, and Displays.
This document recommends criteria for the design, installation and operation of panels, controls, and displays on the flight deck of transport aircraft.
http://standards.sae.org/arp4102/7/ Electronic Displays.
This document recommends criteria for electronic displays on the flight deck of transport aircraft. Electronic displays include electronic flight instruments, alert displays, aircraft system displays and control/display units for flight management and radio management systems.
I would also echo what @Severan Rye discussed with regard to avoiding the blue end of the spectrum in night displays.
Descriptions are from http://webstore.ansi.org