Glass LED display solution: critical - six factors China lighting network

City of tall buildings, many of them are glass curtain wall structure, it's a very good outdoor advertising carrier, through the transparent LED screen technology, building into a three-dimensional photoelectric advertisement carrier, became popular at home and abroad in recent years. Glass curtain wall LED display screen in the design of body, want to consider to display content, the size of the space condition, the screen body, pixels, and other important factors, at the same time to ensure that the production process, technical index is suitable for glass curtain wall, such as the practical application demand, combined with project cost, to carry on the reasonable design. 01, point spacing point spacing are adjacent to the distance between the two LED lights bead center, the unit is mm. Visual particles are mainly from the human eye has a certain resolution, in a certain distance to watch two points, when two points close to a certain extent, the human will not be able to distinguish. Nearly two years with the improvement of transparent LED screen manufacturing technology, glass curtain wall LED display resolution, glass curtain wall shows a select the smallest distance from the initial design specification solutions to choose appropriate distance specifications. So, how to choose appropriate point spacing specifications? Point spacing is an important basis, LED curtain wall screen models also decided to the final screen effect. The smaller models, point spacing is smaller, the higher pixel density, the more suitable broadcast hd content. Point spacing and appear a rate is a choice, point spacing, the smaller the permeability rate is generally lower. This is because the point spacing is smaller, the higher pixel density, LED lamp bead arrangement more per unit area, inevitably lose part of permeability, and high permeability rate is just LED transparent screen to maximum advantage, and increase the rate of transparent price is point spacing expanded, which affect its picture clarity and display effect. Viewing distance is to choose the type of important basis, watching the farther the distance, generally the screen area, the greater the products suitable for selected large number; The closer viewing distance, the smaller screen size, choose a small model. But as technology advances, spacing and transparent rate can be further improved, reaching an ideal balance, big transparent rate above 90%, for example, do 3 ~ 6 mm spacing between the pixel density. 02, encapsulation technology decision LED quality factor is the main material, such as casing material, chips, lights, power supply, etc. , another factor is the encapsulation process. Pixel packaging technology is related to the transparent screen color saturation, perspective and other display effect and the cost of production, quality stability, transparent LED curtain wall packaging technology mainly for the table affixed SMD model, table paste is encapsulated light-emitting tube paste on the circuit board, and then for processing ChengBing body integrated circuit welding process. Its good heat dissipation, uniform color, the whole screen positive maintenance, can greatly reduce the maintenance cost and difficulty; At the same time, in the process of encapsulation of filler metal compound, mixed color effect is good, soft light. 03, LED control LED control part is the core part of the decision visualization, control circuit built-in high-performance single chip micro control chip. Controller through internal control program to send control signal and data LED drive chip, the LED driver chip receives the signal, a corresponding action, all the way to each red, green, and blue LED chip to realize control alone. 1 drive system is the function of LED driver part receive color data and drive the LED transparent screen according to the brightness values of the data represented by shows that usually has permanently flow, voltage stability and constant pressure and constant current three kinds. Constant current drive circuit of the output current is constant, the output of the dc voltage changes over load resistance, the whole circuit is not afraid of load short circuit, but it is forbidden to load completely open. Regulating circuit output voltage, output current along with the increase and decrease of load change, the whole circuit is not afraid of open load, but it is forbidden to load completely short circuit. First, constant voltage and constant current mode is the most ideal drive circuit, is to test the LED current, and to control the LED voltage, to improve the LED life, reduce the power consumption, commonly used in high-grade LED products. 2 control system of LED display effect depends on the size of the through its current and voltage, time, etc. , so the control system mainly is to control the output power of the LED. At present, the PWM ( Pulse modulation) Control design of LED power supply, conversion efficiency as high as 80% ~ 90%, and the output voltage or current is very stable, belongs to the high reliability electricity. PWM to control the LED on or off, the percentage of time in time scale is divided into several levels, the LED display the corresponding number of grey scale ( Gray-scale) 。 7 m, can show a 24-bit true color information. General PWM frequency is greater than 100 hz, or watching a flicker when the show is and scan lines. Gray level for 10 domestic now, most refresh rate is 800 ~ 1000 Hz, the LED industry transparent screen refresh rate in more than 1920 Hz. YanZhiXiang

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