![]() ![]() Replacing this light source has several benefits. They have replaced the less efficient CCFL light source with the cool light of LEDs. However, most LED displays are still a variation in liquid-crystal technology. LED screen technology is changing rapidly. LED Screens: Understanding a New Technology The next generation of laptops and monitors incorporated light-emitting diodes. Environmental concerns led researchers to look for a better lighting option. Like other CCFL light sources, the fluorescent lights in LCDs are manufactured using mercury. ![]() For this reason, displays that use fluorescents continue to bear the LCD-screen label. These were some of the longest-lasting and efficient light sources of the time. The first generation of LCD screens used fluorescent lights for this purpose. In a TV or computer monitor, more advanced technology allows for pixels in a wide variety of colors.īacklit displays require a light source. In a simple screen like a digital watch, the blocked light creates a black display. As electric currents pass through the crystalline layer, the crystals can block different light frequencies. In an LCD screen, two pieces of polarized glass sandwich a layer of liquid crystals. However, it was not until the 1960s that people learned how to incorporate them in displays. Scientists have studied the properties of liquid crystals since their discovery in the late 1800s. LED: Side by Side ComparisonĪ liquid crystal display (LCD) has liquid crystal material sandwiched between two sheets of glass. Liquid crystals in LED screens are backlit using more efficient light-emitting diodes. Older LCD monitors use fluorescent lights. The source of the backlighting creates the distinction between LCD and LED screens. A monitor or TV must be backlit by a more robust light source. A small screen like a watch may have a reflective layer that directs ambient light. These crystals do not produce light on their own. Devices from watches to appliance displays use liquid crystals to share information. The smaller size made it possible to develop portable laptop computers. These screens were much thinner and lighter. The liquid-crystal display TV quickly displaced its CRT-based relatives. These heavy appliances required sturdy TV stands and were difficult to move. People of a certain age will remember the size and heft of a cathode-ray tube TV or monitor. ![]() These three colors form a pixel that can display virtually any color by adjusting the intensity of the diodes used to backlight the display. LED screens are made up of red, green, and blue LEDs that are installed in a fixed pattern. Light Emitting Diode (LED) displays can be found on cellphones, TVs, and computers. Newer LCD screens incorporate light-emitting diodes. Older LCD screens were backlit with fluorescent lights, which contain mercury. Since liquid crystals don’t emit light, these screens require a backlight or reflector to produce images. LCD screens feature a layer of liquid crystals sandwiched between two panes of polarized glass. Liquid crystal displays (LCD) are flat-panel screens used for displaying information or images on everything from watches to computer monitors and televisions. But do you know the difference between these two display types?
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