In recent years becoming increasingly popular among the OLED-displays of mobile manufacturers. What are its advantages and disadvantages compared to the LCD?
Now mobile devices are supplied with different kinds of displays: LCD, OLED, AMOLED. Every mobile manufacturer touts the advantages of the screen being used, some even improve screen technology and are developing their own versions, for example, Super AMOLED from Samsung or Optic AMOLED from OnePlus.
Before you buy another "smartphone with best display", you need to understand what benefits you remove it from the user.
What is OLED?
OLED stands for Organic Light Emitting Diode, that is, the organic light emitting diode, or just the organic LED. To create them using thin films consisting of several layers of carbon material.
As can be seen from the name, these diodes emit light by passing an electric current through them. Therein lies one of the main differences between these displays by LCD screens - they do not require additional lighting.
The ability of organic materials under glow effect of electric current was discovered in the 1950s. But technology has rapidly developed and applied in various areas only in recent years.
Principle of operation
LED panel is made up of six layers. The upper and lower shielding layers disposed glass or plastic. Wherein the upper insulating layer is called and the bottom - the substrate. Since OLEDs are very sensitive to oxygen and moisture, they play an important role.
Between these layers are cathode (negative electrode) and an anode (positive electrode). In between two already placed layer of organic molecules called radiating (adjacent to the cathode glow is formed therein) and conductive (near the anode).
To make the LEDs emit light, the voltage is conducted through the anode and cathode.
As electricity Incoming cathode receives electrons from the power source and the anode of losing or, in other words, it receives hole.
As a result, the electrons do negatively charged emission layer, and the conductive layer becomes positively charged.
Positive holes are much more mobile than the negative electrons, so they jump over the border to the radiating conductive layer. When an electron hole occurs, they cancel each other, and a short burst of energy is released in the form of particles of light - a photon.
This process is called recombination. As it happens many times per second, the LED produces continuous light until the current stops flowing. Through the use of a plurality of diodes red, green and blue colors are sophisticated color high-resolution images.
There are two types of LEDs. In the traditional version used small organic molecules placed on the glass to produce light. Another type uses a large polymer molecules. These are called light emitting polymers (LEP) or polymeric light-emitting diodes (PLED), and are less in thickness and flexibility.
OLED displays can be constructed in various ways. In some designs, the light exits through the upper insulating layer in the other - through the substrate. large size panels are also characterized in that the pixels are formed of separate elements of LEDs.
Also, arrangement of red, blue and green pixels can vary: they may be next to each other or above each other. In the latter case, in each square centimeter fit more pixels, which provides a higher resolution, but also turns the display column.
advantages of OLED
OLED displays in many points superior to LCD screens.
- The small thickness (approximately 0.2-0.3 mm, generally, LCD is about 10 times the thickness).
- Little weight.
- High brightness.
- Minimal energy consumption (because the backlight is not needed).
- The high refresh rate (OLED reacts 200 times faster, which is important when playing fast-moving images, such as watching sports or games).
- A more saturated color, and black color (due to the absence of illumination of black pixels).
- Wide viewing angle.
The most important shortcomings of OLED displays is their fragility. Early versions of these displays worn about four times faster than LCD. With the development of modern technology producers managed to reduce the difference, and now displays based on organic light-emitting diodes can withstand several years of active use.
Furthermore, as practice shows, the red and green LEDs last longer than their blue counterparts. Over time, this can lead to distortion of colors.
Another problem is the sensitivity to water. As noted above, therefore plays an important role here insulating layer.
Also worth noting is that the production of OLED-displays are still more expensive than LCD. As a result, the consumer will have to pay more for a device with an LED panel, than its counterpart from the LCD screen. In the case of the display of damage repair may also be more expensive.
The technology is still relatively new, but more and more manufacturers tend to use it in their own products. Now OLED-displays used in television screens, computers, music players, smart watches and smart phones.