"Outdoor readability" refers to how easily something can be seen and read when used or displayed outside, such as on a screen, sign, or device. Full definition
The 10.1 - inch display that Nokia is planning to use will run at 1920 x 1080 resolution, and has been improved for outdoor readability thanks to a high amount of bright output. (theverge.com)
However, just like their Smartphones, Nokia is emphasizing the display's performance in high ambient light with «Enhanced outdoor readability,» most likely indicating a very bright and low reflectance screen. (displaymate.com)
The idea of a tablet with an electronic paper display is an intriguing one given the energy - efficiency and outdoor readability of epaper displays, but the PaperTab is so far off base that if it were posted at the start of April I would've thought it was a joke. (blog.the-ebook-reader.com)