OLED was discovered one night in 1979 by Dr. Ching W. Tang of Kodak\'s Rochester Laboratory. On his way home, he suddenly remembered that he had forgotten something in the laboratory. When he returned to the laboratory, he found that an organic battery used for experiments was shining in the dark! This marked the beginning of the birth of OLED. In 1987, Kodak successfully used a double-layer organic structure similar to a semiconductor PN junction to make a low-voltage, high-efficiency light emitter for the first time. In 1990, a laboratory in Cambridge, England, also successfully developed a polymer organic light-emitting element, and then established CDT Display Technology. After these two companies developed OLED materials, they laid an important foundation for the production of OLED displays.
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