Two types of screen materials: LCD and OLED
By Steve Lowry 2018-08-21 12140 1
LCD: that is, Liquid Crystal Display
It is the most common display type among mobile phones because of its low power consumption, cheap price, and good image quality. They are generally easy to read with backlight, even under direct sunlight.
Some of the types of LCD displays are TFT, IPS, SLCD, UFB, SNT, NOVA, etc. They don’t represent different screen materials but the diverse display technology of LCD. The most common LCD display technology is listed as follows:
TFT: Thin Film Transistor is a kind of active-matrix LCD (AM-LCD)
This means a special transistor is located on the back of the display, allowing it to control every pixel on display individually. This ensures faster response time. TFT is the most common display technology, featuring high brightness, great contrast, strong lays of graphics and bright image. However, it also consumes more power and is more expensive. Motorola is the representative of the TFT screen.
SLCD: Splice Liquid Crystal Display
SLCD is an integrated splice display unit. It can not only be used as a display individually, but also splice into a big screen. It is a high-end derivation of LCD, featuring warmer color, properer brightest of human to watch.
IPS: In-Plane Switching
IPS is commonly known as "Super TFT". As mentioned, it is actually just a variant of the TFT screen. It is a kind of TFT screen essentially, but just a TFT screen adopting IPS technology, that is, the liquid crystals are aligned horizontally to the screen instead of vertically. The advantages of IPS screen technology is the wider viewing angle, accurate color reproduction, less fluid when touching, energy saving and environmental protection. iPhone4 is the representative of IPS screen.
OLED: Organic Light-emitting Diode
OLED is made from organic light-emitting materials that emit light when electricity is applied. OLED displays are emissive - and do not require any backlight or filtering systems that are used in LCDs. As a result, OLED is thinner, lighter, brighter, need less power, have better viewing angles, contrast and response time for video and animation. OLED is also cheaper and easier to manufacture.
There are two types of OLED displays - PMOLED and AMOLED. The difference is in the driving electronics - it can be either Passive Matrix (PM) or Active Matrix (AM).
PMOLED: Passive-matrix Organic Light Emitting Diode
A PMOLED display uses a simple control scheme in which you control each row (or line) in the display sequence (one at a time). PMOLED electronics do not contain a storage capacitor and so the pixels in each line are actually off most of the time. To compensate for this you need to use more voltage to make them brighter. PMOLED displays are also restricted in resolution and size. They are usually small and are used to display character data or small icons: they are being used in MP3 players, mobile phone sub displays, etc.
AMOLED: Active-matrix Organic Light Emitting Diode
AMOLED is a display technology widely used in mobile phones, laptops, and televisions. Its response time is faster than IPS, and the image quality is better than all above ones. It can display clear in outdoor light, just slightly inferior to the NOVA. In general, AMOLED is featured with emissive, less power consumption, wide viewing angle, high contrast and faster response rate. AMOLED displays may be difficult to view in direct sunlight compared with LCDs because of their reduced maximum brightness.
An AMOLED is driven by a TFT which contains a storage capacitor that maintains the line pixel states, and so enables large size and large resolution displays. AMOLED can be made much larger than PMOLED and have no restriction on size or resolution.
AMOLED is widely applied in Samsung mobiles, but in fact, it is not the exclusive technology of Samsung.
Super AMOLED, in one hand, is more sensitive than AMOLED in operation, the screen can be seen clearly under the sun, even at any angle. However, its disadvantage is also obvious. The biggest downside is poor color reproduction and unnatural bright tone.
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