What are the optical conditions required for the LED signage screen?


Today's customers prefer more logos than just monochrom […]

Today's customers prefer more logos than just monochrome or white logos. Many of them like the ever-changing color changes and animated lighting effects mixed with red, green and blue (RGB). As we all know, the most commonly used white LED lighting production methods are:

(1) Use the blue LED to excite the yellow phosphor layer, so that the excited yellow light is mixed with part of the blue light that is not absorbed by the phosphor to form white light.
(2) White light is formed by directly using red, green and blue three monochromatic LEDs to mix light. The white light LED with the blue excitation phosphor layer basically has the phenomenon of uneven color distribution in space, which is caused by the inconsistency of the optical paths of the photons of each blue LED and the inhomogeneity of the phosphor.
Although the screening of LED particles is important, because the outdoor LED signs are added with secondary packaged LEDs, variables that may produce light and color quality during the packaging process are: consistency of packaging materials, injection molding equipment and mechanical inter-equipment The difference, the technology and proficiency of injection molding, the environment and temperature of the package, the thickness and shape of the package, and so on. In addition, the thermal conductivity of the packaging material is also very important. The light color parameters of all LEDs will change accordingly with the temperature of the PN junction of the LED. The packaged LED must effectively conduct heat from the inside to the outside, so that all Photoelectric parameters can be kept consistent.

The key to the whole technology is an excellent secondary packaging material and packaging process that cannot change the quality of the light color of the particle LED too much. If there is a change, the change and change of the individual LED and the LED group must also be consistent, so that Only in this way can the consistency and uniformity of the produced logo screen be effectively guaranteed.