LED and LED display
LED luminous color and luminous efficiency and the production of LED materials and processes related to the current widely used are red, green and blue three. due to
LED working voltage is low (only 5V), can take the initiative to light and have a certain brightness, brightness and voltage (or current) regulation, itself impact resistance, vibration resistance, long life (100,000 hours), so large display devices , There is no other way to display and LED display mode.
The red and green LED together as a pixel display is called two-color screen or color screen; the red, green and blue LED tube together as a pixel display called three-color screen or the whole Color screen. The production of indoor LED screen pixel size is generally 2-20 mm, often used to produce several different colors of the LED die package into one, the outdoor LED screen pixel size is 8-32 mm more, each pixel By a number of various monochromatic LED composition, the common product called pixel tube, two-color pixel tube generally consists of 2 red 1 green, three-color pixel tube with 1 red 1 green 1 blue composition.
Regardless of the LED production of monochrome, two-color or three-color screen, you want to display images need to constitute the pixels of each LED's luminous brightness must be able to adjust the fineness of its regulation is the display of the gray scale. The higher the gray scale, the more delicate the displayed image is and the more rich the color is, the more complicated the corresponding display control system is. Generally 256 grayscale images, the color transition has been very soft, and 16 grayscale color images, the color transitional boundaries are obvious. Therefore, the current requirements of color LED screen made of 256 to 4096 gray level.
LED display materials used in the light of the following forms:
① LED light (or single light) generally consists of a single LED chip, reflective bowl, metal anode, metal cathode composition, outsourcing with a light-condensing ability epoxy shell. One or more (different colors) single lamps can be used to form a basic pixel, which is mostly used for outdoor displays because of its high brightness.
② LED dot matrix module consists of a number of chips constitute the luminous matrix, with epoxy resin encapsulated in a plastic shell. Suitable for ranks scan drive, easy to form a high-density display, used for indoor display.
③ SMD LED light (or SMD LED) is the LED light bulb in the form of welding the package can be used for indoor full color display, enabling single point of maintenance, effectively overcome the mosaic phenomenon.
