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Views of a liquid-crystal display, both with electroluminescent backlight switched on (top) and switched off (bottom). A backlight is a form of illumination used in liquid-crystal displays (LCDs) that provides illumination from the back or side of a display panel.
Once the switch happens, green changes to red. This feature allows the presenter to be aware of the upcoming transition, and, for example, change their posture. In addition to the tally lights, an additional light called ISO is sometimes used. ISO is the abbreviation for isolated, and it indicates that the video signal is being recorded separately.
This is because even in the "off" state, black pixels still allow some light from the backlight through. Some LED-backlit LCDs use local dimming zones to increase contrast between bright and dim areas of the display, but this can result in a "blooming" or "halo" effect on dark pixels in or adjacent to an illuminated zone. [3]
The purpose of bias lighting is to reduce the perceived brightness of the display as a result of the contrast with the slightly illuminated area around it. [1] This reduces the eye strain and fatigue that occurs when viewing a bright display against a very dark background for an extended time, [1] and increases the perceived blackness, perceived highlights, and overall contrast of the display.
A UK illuminated rocker switch in the off position. Illuminated switches incorporate a small neon lamp or LED, allowing the user easily to locate the switch in the dark. Household illuminated switches were introduced in the mid-1950s. [4]
Burn-in on a monitor, when severe as in this "please wait" message, is visible even when the monitor is switched off. Screen burn-in, image burn-in, ghost image, or shadow image, is a permanent discoloration of areas on an electronic visual display such as a cathode-ray tube (CRT) in an older computer monitor or television set. It is caused by ...
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The light source is used to provide the necessary illumination for the LCos panel. The most common light source used in LCos display systems is a high-intensity lamp. This lamp emits a broad spectrum of light that is filtered through a color wheel or other optical components to provide the necessary color gamut for the display system.