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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]
Dimming can be almost instantaneous and is easily controlled by remote electronics. This development also made it possible to make dimmers small enough to be used in place (within the pattress) of normal domestic light switches. The switches generate some heat during switching and can also cause radio-frequency interference. [7]
As the cases on many computers are not perfect shields, some of this radio-frequency energy can leak out and cause interference to radio (and sometimes TV) reception. Switched-mode power supplies or packs can be a source of interference. [quantify] These are used in consumer electronic products such as phone charges and in some lighting systems.
An ELP gives off uniform light over its entire surface, but other backlights frequently employ a diffuser to provide even lighting from an uneven source. Backlights come in many colors. Monochrome LCDs typically have yellow , green , blue , or white backlights, while color displays use white backlights that cover most of the color spectrum .
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A street lamp mounted on a bracket and column A high pressure sodium street light fixture. Street light interference, sometimes called high voltage syndrome, is the claimed ability of individuals to turn street lights or outside building security lights on or off when passing near them. [1]
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