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This ever-so-slight tendency to stay arranged in one position can throw the requested color off by a slight degree, which causes the image to look like the traditional "burn-in" on phosphor based displays. The cause of LCD image retention is different from phosphor aging as in CRTs, but the visual phenomenon is the same: uneven use of display ...
Leakage may also mean an unwanted transfer of energy from one circuit to another. For example, magnetic lines of flux will not be entirely confined within the core of a power transformer; another circuit may couple to the transformer and receive some leaked energy at the frequency of the electric mains, which will cause audible hum in an audio application.
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens , but some newer types of projectors can project the image directly, by using lasers .
A flashlight sold at Target that projects Halloween-themed images was recalled because it can overheat, causing fire and burn hazards. Halloween Hazard: Target Toys Recalled Due to Burn and Fire Risks
21st century mobile phones have the ability to store thousands of photos and can take photos of good quality. Projector phones allow sharing them with a larger audience than on the phone's small screen. [5] One study found that people preferred to view and share photos with projector phones, compared to using conventional mobile phones. [6]
The user repeatedly squeezes a handle to spin a flywheel inside the flashlight, attached to a small generator/dynamo, supplying electric current to an incandescent bulb or light-emitting diode. The flashlight must be pumped continuously during use, with the flywheel turning the generator between squeezes to keep the light going continuously.
A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers to display information. Liquid crystals do not emit light directly [1] but instead use a backlight or reflector to produce images in color or monochrome. [2]
A CdTe light-blocking layer prevents the low-intensity writing light from shining through the device; the photosensor and light-blocking layer together form a rectifying junction, producing a DC voltage bias across the liquid crystal layer, transferring the image to the reflecting side [2]: 5 by changing the rotation of polarization in the ...