The LED display is a kind of flat panel display, which consists of small LED module panels, which are used to display various information such as text, images, videos, etc.
The LED electronic display integrates microelectronic technology, computer technology, and information processing. It has the advantages of bright colors, wide dynamic range, high brightness, long life, and stable and reliable operation. LED displays are widely used in commercial media, cultural performance markets, stadiums, information dissemination, news releases, securities trading, etc., which can meet the needs of different environments.
Product Background
LED display is an electronic display screen composed of LED dot matrix, through the light and extinguishing traffic light beads to replace the screen display content form such as text, animation, pictures, video timely conversion, through the modular structure for component display control. It is mainly divided into display module, control system, and power supply system. The display module is led light dot matrix to form a screen illumination; The control system is to control the light and extinguishing situation in the area to achieve the conversion of the content displayed on the screen; The power supply system converts the input voltage and current to meet the needs of the display screen.
LED screens can realize the transformation of different forms of information presentation mode, and can be used indoors and outdoors, which has the advantages of other displays. With its high brightness intensity, small working power consumption, low voltage demand, small and convenient equipment, long service life, impact resistance and stability, strong resistance to external interference, its rapid development and widely used in various fields.
LED luminous color and luminous efficiency are related to the material and process of making LED, the light bulb just started with blue light, followed by phosphors, according to the different needs of users, adjust different light colors, widely used red, green, blue, yellow four. Due to the low working voltage of LED (only 1.2 ~ 4.0V), can actively emit light and has a certain brightness, brightness can be adjusted with voltage (or current), itself is impact-resistant, anti-vibration, long life (100,000 hours), so in large display equipment, there is no other display method that matches the LED display method.
LED, light emitting diode (short for the light emitting diode). It is a diode made of compounds of gallium (Ga) and arsenic (As), phosphorus (P), nitrogen (N), and indium (In) by controlling the display mode of semiconductor light-emitting diodes, which can radiate visible light when electrons are combined with holes, so they can be used to make light-emitting diodes. As an indicator light in circuits and instruments, or as a text or digital display. Gallium arsenide diodes glow red, gallium phosphide diodes glow green, silicon carbide diodes glow yellow, and indium gallium nitrogen diodes glow blue.
The red and green LED chips or lamps are put together as a pixel production of the display screen is called a three-color or dual primary color screen, the red, green, blue three kinds of LED chips or lamps together as a pixel display is called a three-color screen or full-color screen. If there is only one color is called monochrome or monochrome screen, the pixel size of the indoor LED screen is generally 1.5-12 mm, often using several LED cores that can produce different primary colors packaged into one, the pixel size of the outdoor LED screen is mostly 6-41.5 mm, each pixel is composed of several kinds of monochrome LEDs, the common finished product is called a pixel cylinder, the two-color pixel cylinder is generally composed of 2 red and 1 green, and the tricolor pixel cylinder is composed of 1 red 1 green 1 blue.
Whether it is made of monochrome, two-color, or tri-color screens with LEDs, the luminous brightness of each LED that needs to be composed of pixels to display the image must be adjustable, and the fineness of its adjustment is the gray level of the display. The higher the grayscale, the more delicate the displayed image, the richer the colors, and the more complex the corresponding display control system. In general, the color transition is very soft in the 256-level grayscale image, and the color transition line in the 16-level grayscale color image is very obvious. Therefore, color LED screens are currently required to be made of 256 to 4096 levels of grayscale.
LED Display Basic principle
The LED display is a new type of information display media, which is a flat display screen composed of a light-emitting diode dot matrix module or pixel unit. Figure 2 shows the structure of the 8×8 dot matrix LED display, from the figure, the 8×8 dot matrix requires a total of 64 light emitting diodes, and each light emitting diode is placed at the intersection of the line and the column line, when the corresponding row is set high, a column is placed low, the corresponding diode is lit.
For example, when you want to display text, you can light up the corresponding diode according to the stroke of the composition of the text, so as to achieve the purpose of displaying text, as shown in Figure 3. The complete dot matrix can be composed of 16×16, 32×32, and so on.
Each pixel of the single-color LED display is composed of 1 monochrome LED LED, that is, each pixel contains 1 LED LED; Each pixel of the dual primary color LED display is composed of 2 LED light emitting diodes of 2 monochromatic colors, that is, each dual primary color pixel contains 2 LED light emitting diodes; For the three-primary color full-color LED display, the diodes that make up the pixel point include 3 or more, such as 3 diodes composed of red, green and blue light, so that the purpose of the color display can be achieved according to the color matching principle of the three primary colors; In order to improve the display effect, some displays may be composed of 4 diodes: 2 red LEDs, 1 green LED and 1 blue LED.