To make the display readable in bright light, is has to work with the sun and overpower the sunlight as well. Any character or graphic LCD that is positive mode (that is, displays that have dark letters on a light background) will be sunlight readable. More light will give better readability for these devices.
These monitors operate with the use of backlights which are responsible for making the screen brighter and more visible during daytime. It also makes use of optical bonded glass, which helps reduce reflections and also improves the contrast ratio.
Most of these type of monitors are equipped with various features that make it useable in any climate or time within the day. For liquid proof protection along from dust and other contaminants, it is sealed. Its rugged metal frame protects the contents inside from blunt contact. You can also expect a vibrant display of LCD resolution. There’s also a protective glass that won't crack whenever it is struck or dropped. For the exterior connections, they are sealed to protect from dust and dirt.