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Classification of OLEDs in displays

- Aug 16, 2018 -

                                                Classification of OLEDs in displays



According to different driving methods: According to whether the thin film transistor TFT technology is used in the pixel circuit, the OLED device can be divided into AMOLED (Active Matrix OLED) and PMOLED (Passive Matrix OLED) according to different types of driving. The OLED products on the market are mainly AMOLED.

The AMOLED has a TFT array with pixels that emit light independently. The AMOLED can independently control the illumination of each pixel so that the pixels can illuminate continuously and independently, ultimately forming the desired image.

The PMOLED illuminates the pixels in the array in a scanning manner, and each pixel operates in a short pulse mode. The difference between the two is mainly reflected in the following aspects:

(1) The structure is different. Each of the AMOLEDs has a plurality of thin film transistors and at least one storage capacitor C5. The PMOLED pixels are composed of a cathode and an anode, and the intersections of the rows and columns can emit light;

(2) Different driving modes, AMOLED static driving is not limited by the number of scanning electrodes, and can selectively adjust each pixel independently. The multi-path dynamic driving of PMOLED is limited by the number of scanning electrodes;

(3) AMOLED can achieve high brightness and high resolution;

(4) AMOLED can achieve high efficiency and low power consumption;

(5) AMOLED is easy to realize large-area display;

(6) Different process costs, the AMOLED drive circuit is hidden in the display screen, which makes it easier to achieve integration and miniaturization. Since the connection problem between the peripheral drive circuit and the screen has been solved in the process, this improves the yield and reliability to a certain extent. The PMOLED must use an external drive circuit such as COG or TAB to make the device increase in volume and weight, and the implementation process is complicated.