20 19 went public in the second half of the year. Dong Chao Science and Technology has experienced two rounds of financing from the Provincial Science and Technology Achievement Transformation Fund. In the second half of 2065438+2009, the product went on the market, and the sales volume reached 33 million in that year. Dong Chao technology is the basic technology, which uses negative refraction flat lens (also known as DCT-plate) to convert plane images into aerial stereoscopic images, thus realizing aerial control.