what is the difference between light coming from a light bulb and light coming from tv/smartphone/computer monitor screen ? How do they shine ?
In: Technology
Lightbulbs— old-school ones — use the glow from a metal filament to generate light (and heat) simultaneously. The filament resists the flow of electricity, causing the metal to heat up and glow. The vacuum inside the bulb prevents it from burning/melting. The light and warmth are products of the electricity flowing through the wire filament.
Phone screens are illuminated by LED — light emitting diode. They are a semiconductor circuit that makes light when electricity flows through it.
Light bulbs are not at all the same. Some produce light from heat (like incandescents), others from electrically stimulated gas (like florescents) , and others from direct electrical effects (like LEDs).
TVs, smartphones, and computers introduce even more choices, cathode ray tubes blast electrons into emissive materials, but they also use LEDs like light bulbs.
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