Analysis of the structure type and working principle of OLED part three

6. When an electron encounters a hole, it fills the hole (it falls into a certain energy level in the missing electron).

7. When this process occurs, electrons release energy in the form of photons.

8. OLED emits light.

9. The color of light depends on the type of organic molecules in the emission layer. Manufacturers place several organic thin films on the same OLED to create a color display.

10. The brightness or intensity of the light depends on the magnitude of the applied current. The higher the current, the brighter the light.

Fourth, the classification of OLED

The following are several types of OLEDs: passive matrix OLEDs, active matrix OLEDs, transparent OLEDs, top emission OLEDs, foldable OLEDs, white light OLEDs, OLED module, etc.

Each OLED has its own unique use. Next, we will discuss these types of OLEDs one by one. The first is passive matrix and active matrix OLEDs.

PMOLEDs have cathode strips, organic layers, and anode strips. The anode and cathode strips are perpendicular to each other. The intersection of the cathode and the anode forms the pixel, which is where the light is emitted. An external circuit applies current to selected cathode and anode strips to determine which pixels emit light and which do not. In addition, the brightness of each pixel is proportional to the magnitude of the applied current.

PMOLEDs are easy to manufacture, but consume more power than other types of OLEDs, mainly because they require external circuitry. PMOLEDs are most efficient when used to display text and icons, and are suitable for small screens (2-3 inches diagonal), such as those often found on mobile phones, PDAs, and MP3 players. Even with an external circuit, passive matrix OLEDs consume less power than the LCDs currently used in these devices.