White Character LCD Modules attenuation and its Material Analysis

The advent of the blue LED, the use of phosphor and blue LED combination, you can easily obtain white light LED, which is the industry's most mature and a white package. Currently white LED lighting has become the general household lighting has become a reality. But in the course of more white products attenuation, not suitable for the lighting market, Lehman photoelectric lighting for the high-end market demand, increase the development of white light by changing the packaging technology and materials with low attenuation white products developed for LED lighting industry to do a little modest. The following is the author summed up during the packaging process five-point experience, industry colleagues to exchange with you, in order for the white LED packaging technology to enhance the building blocks. Lcd display module
A wafer on the impact of white LED light failure
The experimental results from the current point of view, the impact of bad light wafer is divided into two categories:
The first is the chip lead to attenuation of different materials are different, the most commonly used material for silicon carbide wafer substrate blue and sapphire, silicon carbide general structure designed as a single electrode, the heat better, sapphire general design for the two-electrode, the heat is more difficult export, thermal effect is poor;
The second size of the wafer, the wafer material is the same, different size and different attenuation gap.
Second, solid crystal primer pairs of white LED light failure
In the white LED packaging industry commonly used solid crystal plastic insulated with epoxy glue, silicone insulation, silver plastic. Three advantages and disadvantages, to be taken into account in the selection. Poor thermal conductivity of the insulating epoxy glue, but high brightness; silicone rubber thermal insulation effect is slightly better than the epoxy resin, high brightness, but due to the silicon component accounted for a certain proportion of the residual solid wafer side silicone gel in the ring with a fluorescent epoxy resin compartment when combined will produce the phenomenon, after thermal shock will result in death peeling lights; silver plastic thermal conductivity than the first two are good, you can prolong the life of the LED chip, but the silver plastic light absorption compared large, resulting in low brightness. For blue-chip dual-electrode in solid crystal with silver glue, the right to control the amount of glue is also very strict, otherwise easily lead to a short circuit, a direct impact on product yield. lcd graphic display modules