First, the concept

OLED, namely organic light emitting diodes, also known as organic laser display. OLED has the characteristics of self-luminous, with a very thin coating of organic material and the glass substrate, when the current through the organic materials will be light, and OLED display viewing angle, can achieve flexible, and can significantly save energy .
It is actually a FSTN CSTN screen with a layer of color film. With three RGB pixels to form a display pixel. On the surface only increases the twist angle so that the liquid crystal molecules, but in fact it is far from the case because of the twist angle increases, making another characteristic of liquid crystal revealed, is the aforementioned birefringence.

Two, OLED and CSTN principle

The main principle of an OLED is driven in the external voltage, such as electrons and holes from the cathode, respectively, from the anode as an electron transport layer and the hole transport layer to migrate to the organic light emitting layer, recombine in the organic layer, the release of energy, the organic light emitting substance molecules are excited, the transition to an excited state, the excited molecules to produce luminescence from an excited state to the ground state.
CSTN display principle and TN are fundamentally completely different, which utilizes liquid crystal birefringence. After the incident outside light into a bunch of lines on the Polaroid polarized, but linearly polarized light through the liquid crystal molecules in the layer is no longer just when the polarization direction of the twist, but broken down into two beams of light - an unusual light and extraordinary light, the two beams of light emitted when the interference in each other, making CSTN without powering time is always showing some background.

Three, OLED and CSTN identify skills

OLEDVSCSTN two kinds of color, mainly through the following four kinds of techniques to identify.

First, the color distinction.
OLED and CSTN color on the screen is easy to distinguish, OLED because it is a self-luminous material does not require background light, so remarkable uniformity in color, the color is bright, close to the original effect, and because of the color CSTN level and translucent OLED worse than when displaying black screen, CSTN still will be revealed very slight background light, making the color is not obvious symmetry, which is more typical of the CSTN performance;

Second, the difference between the wide viewing angles and limited degrees of viewing angle.
OLED viewing angle is very large, can reach 170 degrees, no matter what point of view, we can clearly see the screen above the font and color, while, OLED in the sun can still see the screen of the display, while CSTN can not achieve this effect, the viewing angle is far less than OLED, which is seen only from the color of the front panel, at other angles, CSTN also not possible to see clearly, moreover CSTN screen in the sunlight becomes dark, do not know. This is the biggest difference between the two, but also the most easily recognizable skills door.

Third, the power effect.
OLED because of its own variety of superior performance, the industry has been recognized as the next generation of mainstream display technology, it is thinner, lighter, high-resolution, refresh rate, low energy consumption, low temperature (minus 40 degrees Celsius performance is still good) and seismic performance, potential low cost, flexible and environmentally friendly design, etc., and these are the power, CSTN slightly less in comparison.