Small - molecule OLED and active - drive (AMOLED) are promising

OLED (OrganicLight - EmittingDiode) Chinese name called organic light-emitting diodes (oleds), by a chinese-american professor tang found in the lab, with the need of the LCD light source, outside the OLED has illuminated the characteristic, don't need additional light source, so a flexible, lightweight, save electricity, the advantages of large visual Angle, expanding its application field, to replace the LCD.

According to the use of organic functional materials, OLED devices can be divided into two categories: small molecular devices and high molecular devices. Small molecule OLED technology developed early (1987) and has reached the commercial production level. Polymer OLED is also known as PLED (PolymerLED), its development began in 1990, due to the polymer can be prepared by adopting the method of spin coating, ink jet printing film, which could greatly reduce the cost of production device, but the technology is far from mature.

According to different driving modes, OLED devices can also be divided into passive drive type (PassiveMatrix, PM, also known as passive drive, PMOLED) and active drive type (ActiveMatrix, AM, also known as active drive, AMOLED). The passive drive type does not use a ThinFilmTransistor (TFT, ThinFilmTransistor) substrate. Active drive type adopts TFT substrate, which is suitable for medium and large size display, especially large size full-color dynamic image display. At present, passive drive OLED technology has been relatively mature, most commercial products are passive drive.