A, LED profile:

LED is the acronym for light emitting diode, light emitting diodes, referred LED. LED light technology principle is that some semiconductor materials under energized case will issue a specific wavelength of light, this electrical to optical conversion efficiency is very high, the materials used for different chemical treatment, you can get all kinds of brightness and perspectives of LED. It is a process by controlling the semiconductor light-emitting diode display, used to display a variety of information, text, graphics, images, animations, quotes, video, video signals.

Second, LED mosaic screen currently has the following main types:

Outdoor color LED display: outdoor color display is widely used in the square, business centers, roads and other densely populated outdoor venues.

Indoor full color LED display: full color, also known as the three primary colors: the smallest display units composed of red, green, and blue components.

Outdoor Full Color LED Display: Full color is also known as the three primary colors: the smallest display units composed of red, green, and blue components.

Indoor color LED display: color display widely used in finance, telecommunications, telecommunications, electricity, hospitals, military, public security, shopping malls, finance, taxation and other departments and sites.

 III. The basic configuration of the display:

LED display that can be combined by a number of mosaic display unit (unit display board or unit box) constitute Screen, together with an appropriate controller (control board or control system). Therefore, a variety of specifications display panel (or unit cabinet) with different control technology controller can be composed of many types of LED display to meet different environments, different display requirements.

IV. LED screen the general parameters:

 1. Physical indicators

Pixel center distance pixel pitch (spacing)

The distance between the centers of adjacent pixels. (Unit: mm)

Density density (points)

The number of pixels per unit area (unit: dot / m2). There is a certain relationship with the number of points calculated spacing.

The formula is: Density = (1000 ÷ pixel center distance).

LED display higher the density, the sharper the image, the smaller the optimum viewing distance.

Flatness (level up degree)

A light emitting diode, a pixel, the display module, the display module when the composition of the LED display unevenness plane deviation. Flatness LED display easily lead to bad viewing, Screen color is uneven.

2. The electrical performance

Gradation (gray scale)

LED display the same level of brightness from darkest to be able to distinguish between the brightest luminance series. That is the so-called gray or gray-scale gradation, refers to the degree of brightness and shade. For the digital display technology, the gray factor determining the number of colors displayed. Generally the higher the gray, richer color display, the picture is more delicate, more performance of rich detail.

Gray scale level depends on the system A / D conversion bits. Of course, the system of video processing chip, memory and transmission systems must provide appropriate support for the median job. Generally no grayscale, 8, 16, 32, 64, 128, 256, etc., LED display gray level higher, richer colors, more bright colors; on the contrary, display a single color change Simple.

At present, LED display mainly uses eight processing system, that is 256 (28) levels of gray. Simple understanding is that 256 kinds of brightness change from black to white total. Use RGB color can constitute a 256 × 256 × 256 = 16777216 colors. It is known as 16 million colors. International brand display 10-bit processing system mainly uses, namely 1024 gray, RGB primary colors may constitute 1.07 billion colors.

Frame rate (refresh frame frequency)

Frequency LED display screen information update.

Typically 25Hz, 30Hz, 50Hz, 60Hz, etc., for the higher frame frequency, change the image of continuity as possible.

Refresh rate (refresh frequency)

LED display shows the number of times per second the data is repeatedly displayed.

Often 60Hz, 120Hz, 240Hz, etc., higher refresh frequency, the more stable image display.

Five. Display system

Display system consists of three major parts, namely: the source, control systems and Display Screen

Signal access control system, conversion, processing, transmission, imaging control