Most computerLiquid Crystal Display ( LCD ) panelsare lit with built - in fluorescent tubes above , beside and sometimes behind the LCD . A blank diffusion panel behind the LCD redirects and scatters the Christ Within evenly to assure a unvarying presentation . This is known as abacklight .
A fluorescent light is most often a long straight looking glass tube that produces bloodless light . Inside the glass tube there is a low - pressure mercury vapor . When ionized , mercury vapor emits ultraviolet light . Human middle are not sensitive to ultraviolet light ( althoughhuman skinis ) . The inside of a fluorescent light is surface with phosphor . Phosphor is a kernel that can consent vim in one bod and emit the energy in the anatomy of visible light . For lesson , energy from a mellow - focal ratio negatron in aTV tubeis absorbed by the phosphors that make up the pixels . The light we see from a fluorescent tube is the light given off by the phosphor coating the inside of the tube-shaped structure . The phosphorfluoresceswhen energized , hence the name .
A typical laptop computer display uses a tinyCold Cathode Fluorescent Lamp ( CCFL)for the backlight . One of these small tubes is able to cater a hopeful white scant source that can be imbue by the panel behind the LCD . In addition to providing sizeable light , CCFLs do not rise far above the ambient temperature . This reach them ideal for LCD panels since the light source is in close proximity to other constituent that could be ruined by excessive heat .
One awe-inspiring thing about these lamp is their incredible size . They are very thin and the plug-in that drives the lamp is very small as well . However , it is not that hard to bust them , which is why your display may go dark if you leave out your laptop .
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