LED Display Lighting

1. When we Manufacture LED large display, the first choice in accordance with the brightness of LED indicators or led display module, followed by the choice of products based on red, green and blue color brightness than to determine what kind of color as the base, the general is a low brightness, as Benchmark light, when the benchmark has reached a maximum brightness, the adjustment of another (color) or two (full color). When two-color led display screen is in most cases to green as the base, adjusting the red diode current. General is to reduce the operating current to balance the color yellow for the adjustment of standards, this should reduce the brightness of the led  video display screen. To display the best color balance adjustment, you will reduce the led screen brightness. If the led RGB display brightness in order to achieve the requirements of each color have a maximum brightness, then lost the balance of colors, such as: two-color screen reddish yellow, or green side.

Low-level TTL output is about 0.4V, for irrigation if the current input, modify it by adding the maximum normal current 35mA, when more than this current, the output low-level increased, with the increase in current, constant low-level output higher output voltage that is greater than 0. 4V circuit is still working correctly. Show circuit in the scan, the working current of 20mA to meet the requirements of control of red, because red is relatively high brightness LED; green LED is higher than the operating current 20mA, current about 30 ~ 50mA in between, at this time, 74HC595 output voltage should be increased, because there 74HC595 output resistance, and non-linear change.

2. Dynamic scanning circuit scans, static-driven manner. Display by the display module to scan the frequency of structural limitations, each module there are 8 × 8 months LED display the entire line of data of all modules in series, the data is updated once a long time, when the scanning frequency of 100Hz, the entire led screen brightness will be reduced. If the lower screen of the scanning frequency, indicating lower brightness. Experiments show that sweeping depiction of the relationship between frequency and the color is relatively small.

So,After two-color LED display on the design and analysis, the effective adjustment of the technical parameters of the circuit, to be a better led display sign. Facts have proved that the rational analysis of the technical characteristics of the circuit, so that the work of the best circuits in the state, will be able to achieve the desired effect. 74HC595 companies choose a different circuit, different effects, in a led full color display of as much as possible to choose the same circuit, to avoid influence by the circuit parameters showed different results.
LED display board design and manufacturing is an important condition for the cost of production, therefore, the choice of components in the process of meeting the requirements, select the price low. In this paper the technical design and analysis on the basis of the circuit will adjust to display the best effect, to create a performance / price ratio of the led display panel, with market competitiveness.