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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]
In Thyristor control systems the potential for EMI problems can be minimised by using zero crossing switching where the thyristor is switched on at the moment of time when the AC voltage changes from one direction to the other. A typical SCR based light dimmer which dims the light through phase angle control. This unit is wired in series with ...
Reduced voltages can bring control signals below the threshold at which logic circuits can reliably detect which state is being represented. As the voltage returns to normal levels the logic can latch at an incorrect state; to the extent that even " can't happen " states become possible.
In the early days of digital lighting control, equipment manufacturers employed various connectors and pinouts for their proprietary digital control signals. The most common of these was the three-pin XLR connector (also called cannon jack in some countries). When DMX512 was ratified, many of these manufacturers then issued firmware updates to ...
A non-dim circuit is a special electrical network. In theater, it is a type of outlet usually controlled from the stage manager 's panel or from the Lighting control console . The word non-dim is used to distinguish this type of circuit which operates only in on or off modes, from a dimmer , which can be at any intensity on a continuum.
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A lighting control console (also called a lightboard, lighting board, or lighting desk) is an electronic device used in theatrical lighting design to control multiple stage lights at once. They are used throughout the entertainment industry and are normally placed at the front of house (FOH) position or in a control booth .