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Your Screen Is Better Than You: The History Of OLED Development

- Aug 17, 2018 -

               Your screen is better than you: the history of OLED development


Compared with the traditional liquid crystal display, the OLED display has many advantages such as high power, high brightness, light weight, and wide viewing angle, and gradually becomes the main force of the mobile phone screen. More than 50% of mobile phones issued in the past year or two have been replaced with OLED displays, some of which use rigid OLED displays, and the other are curved screen phones that use flexible OLED displays. Today, we will understand the advantages of OLED display from the perspective of technical principles, and further understand the flexible OLED display technology and future development direction.

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OLED phone screen these years


The full name of OLED is organic light emitting device. Compared with luminescent materials previously made of semiconductor materials such as silicon, the luminescent part of OLED is mostly made of carbon atom-based compounds.


The technology of OLED is constantly known to the public with its application on curved screens, but in fact this technology has existed for some time: OLED is used for the first time on mobile phone screens, or is the popular flip-flop mobile phone in 2008, that In October, Nokia introduced the N85.


Why use OLED instead of LCD?

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The reason why OLED can save power, high brightness, thin and light is related to the physical principle of its illumination. The main difference between the construction of an OLED screen and the previous liquid crystal display (LCD) is that the OLED is capable of emitting light by itself, and the liquid crystal display needs to have other light sources to illuminate.


The imaging principle of the LCD screen can be imagined as behind a curtain, a red plastic bag is placed on a light bulb that has been illuminated. When you open the opening cloth, what you see is red light, and the curtain is black. If you have countless red, green, and blue plastic bags with even white light on the back, you can display different images by controlling the switch on the front curtain of each plastic bag.


Since the liquid crystal display has a second light source, the energy utilization efficiency is not high enough, and the white light behind it is always turned on as long as the display is turned on, even when it is black, the power consumption of the screen is high.


Compared with liquid crystal screens, OLEDs are characterized in that they do not require an external light source, and energy can be applied efficiently. If the OLED is a red plastic bag, as long as a certain voltage is applied to both ends of the plastic bag, the plastic bag can emit red light by itself. When a group of red, green and blue plastic bags are arranged together, different images can be displayed by controlling the voltage of each plastic bag with a thin film transistor (TFT) to control whether the plastic bag emits light. When the plastic bag does not emit light, it is black, so it will be useful to use OLED mobile phones for black screen saver to save electricity.