A variety of flat light source is the main technology business of FOURSUN TECH. Currently, all kinds of flat light source technology extend to various products. The company has also developed a new type of production technology for different product categories, transferring originally passive developed mode to active. We improve the light performance of flat light source; there are mainly overall brightness, average luminance, center luminance, human visual perception and taste problems. To improve related issues, FOURSUN TECH. extends many processing techniques that different from same business to meet a variety of customer needs.