Display monitor luminance

With regard to the displayable contrast, the CMS showed a better reproduction in a dark environment in the tests. In contrast, the mirrors showed a stronger contrast during the day in a brighter environment. Here, the possibility of contrast enhancement for monitors was shown for poor light conditions, and the limitations of the monitor luminance in very bright light conditions. 

In a given ambient lighting, the luminance varies between the minimal luminance, L min, and the maximal luminance, Umax. The ratio Umax/Umin is the luminance ratio. In order to have similar image appearance with respect to contrast, all display devices should have the same luminance ratio and the same display function. If more than one monitor is used in a workstation, as is usually the case, the luminance responses should be compared and found to be similar within specified limits. 

ISO 9241-302 2008 ergonomics of human-system interaction—part 302 terminology for electronic visual displays Image formation time, monitor coordinate system, luminance contrast... 

Screen glare means direct light falling on the screen of the display and the consequences thereof. This incidence of light on the screen of the display is usually caused by the sun. As the monitor has a limited maximum luminance, the luminance caused by sunlight on the display can be greater. This results in a reduction of contrast and colour perception for the driver. 

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