Display visibility and brightness in outdoor lighting

19 Feb 2020

Each generation of our rugged handheld computer models are designed with the best available display technology for outdoor visibility and function. Available display technologies have improved over time, as is visible on the latest generation of our products.

For additional information, see Four Display Factors to Consider When Choosing a Rugged Tablet for Outdoor Work.

Although NIT ratings or lumens measurements are common methods to rate the brightness or luminance of displays, they are not good measures of how viewable the display is in an outdoor setting. Display technology (reflective, transmissive, transflective) and bonding process (LOCA, drybond, no-bond) are bigger factors in how viewable a screen is in natural lighting. A display that has a high measurable brightness can still provide a poor outdoor viewing experience due to the display technology and bonding process. Similarly, you can have a display technology, such as e-ink, with no measurable brightness that is highly visible outdoors. 

If an NIT rating is still needed such as to apply for a specific government contract, the TFT-LCD display on the Mesa 3 and Mesa 2 is 450 nits (about 42 lumens) or 450 cd/m^2 or Lux (lumen per square meter), for both the later US Micro MIPI display or for the previous Sharp LVDS display. 

Some specific conditions can potentially cause the display to be less visible than normal. Such conditions can include (but may not be limited to) the following.

 

 


Original article: 2 Dec 2010