The pandemic accelerated the digital transformation globally by shifting everything from working, learning and even polling to online. From taking days to accomplish a simple task, we have reached a point now where all it takes is few seconds. Thanks to our various electronic devices, we are connected digitally, but how does it works visually? By a screen of course! There is a screen in everything, computers, laptops, TVs, even mobiles.
According to Wikipedia, the proper name for a screen is an electronic visual display. So… what is an electronic visual display? It is an output device capable of displaying images, texts or videos in electronic form but without producing a permanent display. Quite magical if you ask me.
With the rapid advancement of technology, we humans managed to create a variety of screens, which is what I am going to explain below.
Liquid-crystal Display
The type that everyone knows about. or at least heard of. They are a flat-panel display that is paired with a backlight or reflector to produce images, as they are not capable of emitting their own light. This is used in a wide range of applications such as LCD televisions, computer monitors and in flight instruments. They are also used in small devices such as mobile phones, digital cameras and calculators. They are preferred choice of electronic visual display due to their low power consumption and so, can be even powered by batteries.
LED-backlit Liquid-crystal Display
Typical LCDs are backlit by cold-cathode fluorescent lamp (CCFL), which are often thick and had lower contrast ratio. This was solved by LCD backlit using light-emitting diode (LED) instead of CCFL. They are slimmer, more reliable and power efficient than CCFL based LCDs, while also supporting greater contrast ratio and wider color gamut. Sometimes these are wrongly advertised as LED TVs, when in fact, they are not.
Light-emitting Diode Display
They are also a flat panel display similar to LCD TVs, but they use an array of light-emitting diodes as pixels for displaying videos. Due to this, they are much more brighter and is possible to use them at outdoors as store lights and billboards. These use LEDs to actually produce the images as compared to LED-backlit LCDs, in which LEDs only play the role of illuminating the LCD.
Plasma Display
Plasma display panel (PDP) is a type of flat panel display that used small cells of ionized gas that responds to electric fields. This indicates that they do not require a back light for the purpose of illumination as they are produced within the cells. Due to this, they are power hungry if the content displayed is brighter, and consumes less power if they are darker. Due to the competition from OLEDs, PDPs are almost obsolete now.
Quantum Dot Display
This is a display device that uses semiconductor nanocrystals that can produce pure monochromatic red, green and blue light, known as quantum dots. Currently, photo-emissive quantum dots are used in LCD backlights and display color filters for LED-backlit LCDs only. This is a mostly in research type of electronic visual display and so, is not much to talk about currently. But hey, it looks promising!
So those were the few common types of display currently in market for buying. Stay tuned for more interesting information of technologies!
технология 