Characteristics of LED display luminous materials

In 1968, HP produced red LED lights (wavelength 660nm), and then yellow-green (wavelength 570nm), blue (wavelength 470nm) and pure green (wavelength 525nm) that can be used for display screens appeared one after another. However, the manufacturing technology of high-brightness blue and pure green semiconductor chips is mainly in the hands of a few companies in Japan, the United States and other countries, resulting in relatively high prices.

There are several forms of LED luminous materials used in display screens:

① LED luminous lamps (or single lamps)

are generally composed of a single LED chip, a reflective bowl, a metal anode, and a metal cathode, and are wrapped in an epoxy resin shell with light-transmitting and light-collecting capabilities. One or more (different color) single lamps can form a basic pixel. Due to its high brightness, it is mostly used in outdoor display screens.

② LED dot matrix module

A luminous matrix is ​​composed of several chips and is encapsulated in a plastic shell with epoxy resin. It is suitable for row and column scanning drive, and is easy to form a high-density display screen, and is mostly used for indoor display screens.

③ SMD LED luminous lamps (or SMD LEDs)

are LED luminous lamps in the form of soldering. They can be used for indoor full-color display screens, can achieve single-point maintenance, and effectively overcome the mosaic phenomenon.