The role of LED display

LED display is a high-tech product integrating optoelectronic technology, microelectronic technology, computer technology and information processing technology. It can be used to display text and graphics synchronized with computer screens. It has become the most widely used display system in the world due to its unique advantages such as large screen, super vision, flexible and changeable display methods, and is used in financial securities, bank interest rates, commercial advertisements, cultural entertainment, etc. There are huge social benefits and huge economic benefits. It has rich colors, diverse display methods (graphics, text, three-dimensional, two-dimensional animation, TV pictures, etc.), high brightness, and long life. It is an epoch-making product for information dissemination facilities.

The development history of LED display

It has been more than 20 years since the birth of LED devices, but due to the use of raw materials and technological limitations, they have not been widely accepted in the first ten years. After entering the 1990s, with the improvement of technology and the development of raw materials, LED devices have been developed by leaps and bounds in terms of life and brightness indicators, and the cost has also been greatly reduced. In my country and other advanced countries, LEDs are also widely used as light-emitting devices for indoor and outdoor display screens. The outstanding advantage of LED devices is that all indicators are very high, and it can be said that it has the best performance-price ratio among many light-emitting devices. We think LED devices should be our best option right now.

Manufacture of led display

The light-emitting diode products used in the manufacture of display screens have three specifications: single tube, matrix block, and pixel tube to meet the requirements of different applications.

The use environment of LED display is divided into indoor display and outdoor display. The indoor screen usually adopts a matrix block structure with high brightness of 3.7, 5, and 10 (representing the diameter of the light-emitting point, in mm), and the light-emitting diodes on the matrix block are arranged in a 5×8 or 8×8 matrix structure.

Outdoor display screens mostly use super-bright pixel tube structure. The pixel tubes mainly include square 15×15, square 19×19, square 21×21, square 26×26, square 30×30 and other specifications.

What is LED display screen and what are the advantages?

LED (Light Emitting Diode) display screen is a screen developed on the basis of modern digital electronic technology using light-emitting diodes as components. With the development of LED technology, the LED display screen has developed from the original simple text display to various multimedia applications such as text, images, animations and videos. long and low power consumption. Due to the unit modular structure, the size of the screen can be flexibly assembled according to user requirements; its ultra-high brightness makes it irreplaceable outdoors. The LED display screen is directly controlled by the computer. With the popularization of the computer network, the information sources are more extensive, so it occupies an increasingly important position in the information society.

What is the base color?

According to the principles of color science, any color in the world can be formed by mixing the different intensities of three colors, red, green, and blue. These three colors are called primary colors or primary colors.

What is a single-color, dual-color, three-color LED display?

LED monochrome display means that each light-emitting point is composed of a color light-emitting tube, which can be one of red, green, and yellow. Monochrome screens are mostly used for text information, generally without grayscale (or with grayscale), and the cost is low.

Each light-emitting point in the dual-primary color screen is composed of red and green light-emitting tubes, and tens of thousands of colors are generated through the combination of different intensities of red and green. It can be used to highlight multimedia information such as graphic information and film and television. The cost is higher than that of monochrome screens, and it is the mainstream of current display screens.

Each light-emitting point in the three-primary color screen is composed of red, green, and blue light-emitting tubes, which can produce true color effects. It can realistically display multimedia information such as pictures, texts and movies, and the cost is extremely high. With the maturity of blue light-emitting tube technology, the future development prospects are broad.

What is grayscale?

Grayscale can also be considered brightness, and in the LED industry, it refers to the luminous brightness of each primary color. The luminous brightness of the primary color is divided according to the intensity, which is the gray level. The higher the gray level produced, the more colors are displayed, but the cost is also higher. For example, a 16-level grayscale dual-color display can display 16X16=256 colors. Currently popular two technical grades are 16-level grayscale and 256-level grayscale.

Why use nonlinear grayscale modulation?

Just like people’s perception of sound, the human eye’s perception of light intensity is also nonlinear. A one-step increase in light intensity is less than a one-step increase perceived by the human eye. Therefore, if the grayscale output of the screen is modulated and output in equal proportions, the grayscale changes actually felt by people are not proportional, and the grayscale levels are not distinct. For example, the linear 16-level grayscale gives the impression that the brightness of the first 6 levels changes too much, and the brightness of the last 6 levels hardly increases, and the color distortion is serious. Therefore, the grayscale must be output according to the nonlinear law to correct the visual deviation of the human eye, so as to obtain a more realistic color effect. Linear grayscale modulation has been eliminated. When choosing a multi-grayscale screen , not only the grayscale level, but also whether there is a nonlinear grayscale correction function.

Why use a display with a high scanning frequency?

Like TVs, indoor LED screens also use dynamic scanning. Traditional TVs use a 50Hz scan frequency, which gives the impression that the screen is slightly shaken and rolled up and down, which can easily cause eye fatigue for a long time. Therefore, high-end TVs are now introducing 100Hz scanning technology to eliminate this phenomenon. The LED display also has the same problem, so the scanning frequency has become an important indicator to measure the display.

What does CRT synchronous display mean? What are the advantages?

Most computer monitors use CRT picture tubes, so they are sometimes called CRT monitors. CRT synchronous display means that the content of the LED screen can reflect the content on the computer CRT display in real time and synchronously.

early LED screen was mainly controlled by the serial port of the computer or the self-developed control card. The main disadvantage is that it is controlled by special software, the speed is slow, only text or simple graphics can be displayed, and the software and hardware interfaces and protocols are very complex. It is difficult or impossible for users to develop their own software. This type of display is called program-controlled display. At present, this type of display has been eliminated except for some special occasions.

The CRT synchronous display is automatically realized by hardware through the LED card installed on the host without software intervention. In this way, the LED screen is like a mirror display connected to the computer. The content on the computer display is automatically displayed on the LED screen , and the computer multimedia functions can be realized on the LED screen , and the user ‘s control of the LED screen is simplified . In order to control the computer , greatly improve the software utilization rate and facilitate users to develop software independently.

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