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What is AMOLED?
An OLED display was in use till 2006, when AMOLEDs were discovered. The first technological device with AMOLEDs was a Samsung Galaxy Note. OLEDs(Organic light-emitting diodes) were a huge evolution after conventional LCD(liquid crystal diode).
OLEDs generated light by applying current to semi-conductive organic material. This organic material for the most part is carbon. These organic materials have the ability to work at small scales, such that they can work on each pixel by pixel to illuminate light. They enable each pixel in the display to get brighter or darker according to the needs.
These colors were displayed by using organic materials which have the caliber to produce light of specific wavelengths(colors).AMOLEDs(Active-matrix Organic light-emitting diodes) were an enhancement made in OLEDs. An extra layer of TFTs was added in OLEDs. This layer of TFTs offers greater control over light emitted by OLEDs.
Because of this display could be brighter and provide greater contrast. It consumed less power and hence, proved to be a better display. Initially, this technology was restricted to mobile phones, but with the better display is now also used in technological devices apart from phones, like TV, Desktop computers, Laptops.
Despite, all these positive traits AMOLEDs also have some negative traits which do not make it the right choice. Some organic materials have a shorter lifespan hence, AMOLEDs can’t be used in devices that demand a larger life span. Also, the presence of both TFTs and organic materials makes it quite expensive.
What is TFT?
TFT (Thin Film Transistor) is a sort of Field Effective transistor(FET).FET is a three-terminal device used for various applications as Bipolar Junction Transistor.
Current conduction in FET takes place by only one type of charge carrier, holes in the p channel, and electrons in the n channel. TFTs were built by keeping thin films of the active semiconductor layer by layer. A dielectric layer along with a glass substrate is also used in making layers.
TFT was discovered in laboratories in 1968. By 1971, it came into use in technological devices as display alongside LCDs(Liquid crystal Display).LCD contains a backlight that illuminates individual pixels arranged in a rectangular grid, called a matrix. After the discovery of TFTs, they were used along with LCDs.
These TFTs had capacitors which would help to retain the charge actively in each pixel. Hence, these TFTs were also called “Active Matrix”. Hence, the name in AMOLEDs. So, this innovation was much better than conventional LCDs.
Earlier LCDs display was restricted to technological devices like desktop computers, TV but the better display of active-matrix LCD demanded usage of LCDs in mobile devices like Laptops, Smartphones, Tablets.
Even though there are many evolutions after the discovery of TFTs, their pocket-friendly cost, as well as longer life span, makes them one of the most common choices in displays.
Difference Between AMOLED And TFT
- The full form of AMOLEDs is an Active Matrix Light-Emitting Diode whereas the full form of TFTs is Thin Film Transistor.
- AMOLEDs were an improvement made in OLEDs which use organic material predominantly carbon to generate light. TFTs do not use any organic material.
- AMOLEDs can generate their light by generating current through organic materials while TFTs use LCDs which use backlight to illuminate each pixel.
- AMOLEDs have better color quality because of organic materials of different wavelengths which produce brighter colors. On the other hand color quality in TFTs is low.
- TFTs have a layer of the backlight that makes them thick hence power consumption is more than AMOLEDs.
- Presence of organic materials makes the life span of AMOLEDs shorter. Whereas TFTs have a longer lifespan.
- AMOLEDs have a layer of TFT which makes them quite expensive, while TFTs are quite pocket-friendly.
Comparison Between AMOLEDs And TFTs
|Parameters of Comparison
|Active Matrix Organic Light- Emitting Diodes
|Thin Film Transistor
|AMOLEDs use organic material mainly, carbon to emit light.
|They do not use organic material to emit light.
|They generate their own light.
|They can’t generate their own light and hence, rely on backlight.
|Absence of backlight makes them thin and hence have better color quality.
|Presence of backlight makes them thick and so color quality is low.
|AMOLEDs have less power consumption.
|TFTs have more power consumption
|AMOLEDs have less life span.
|Their life span is more than AMOLEDs
|They have faster response timing
|Their response timing is slow
|They are very costly.
|They are cheaper than AMOLEDs