What is Liquid Crystal Display (LCD) Brightness /Luminance

Brightness is usually stated as the maximum light output of the LCD, which can vary greatly based on the transparency of the LCD and the brightness of the backlight and is more accurately referred to as its luminance.

Brightness is a measure of the brightest white the LCD Monitor can display. Typically LCD Monitors are far too bright for comfortable use, and the On Screen Display (OSD) is used to adjust the brightness setting down. Higher brightness is good as it leads to a better contrast ratio and can be useful for dark scenes in games / movies where it might be difficult to distinguish between shades of grey. In general, brighter is better, but there is always a trade-off between brightness and power consumption.

Brightness is measure in cd/m2 (candella per metre squared). Note that the recommended brightness setting for a TFT screen in normal lighting conditions is 120 cd/m2. Default brightness of screens out of the box is regularly much higher so you need to consider whether the monitor controls afford you a decent adjustment range and the ability to reduce the luminance to a comfortable level based on your ambient lighting conditions. Different uses may require different brightness settings as well so it is handy when reviews record the luminance range possible from the screen as you adjust the brightness control from 100 to 0%.