LED global patent applications in the field of a total of about twelve thousand pieces of patent applications in Japan, followed by the United States and China, yellow led lights, all major countries and regions the field of LED patent applications have exceeded ten thousand.
Based on LED technology, the characteristics and industry division of habits, the general field of LED into the substrate, epitaxy, chip, yellow led lights, package, and application of section. LED global patented technology structure of the layout shown in the figure, the patent application 40% concentrated in the package, led high bay, followed by the application (26%) and epitaxial (17%) areas of the substrate and white patent at least. Substrate of patents in the field of 25% concentrated in the sapphire, followed by the GaAs (17%), silicon (16%), gallium nitride (10%); epitaxial field of patents.
From the active layer material, 86% in III-V family, from the functional layer of view 75% concentrated in the n-type layer, yellow led lights, p-type layer and active layer, followed by a cover layer and buffer layer (16%), technical branch of the application of the current spreading layer and the European Union contact layer less; chip patent in the field of 39% concentrated in the electrode design technology, followed by the reflective film (16%), yellow led lights, micro-structure technology (12 percent), the chip shape technology (11% ), the substrate bonding stripping technology (11%), dicing, AR fewer applications for membrane technology, passivation technology; package of patents in the field of 63% concentrated in the substrate and the package, yellow led lights, followed by cooling (15%) electrode interconnect (13%) and fluorescent (7%). Patent applications are mostly concentrated in the field of packaging and application, which indicates that the LED technology is relatively mature, began to enter the application stage.