NRK self-locking screen: Hold the lower bar of the "handle" pull down (but not suddenly drop down with violently), so that the projection screen to drill down to the desired position, holding a "handle" allowed free plus bomb about to make a projection screen to play a self-locking device locking action, resulting in an effective screen desired, then the projection screen that can use (when black bars on the screen is exposed, please do not pull down firmly, development projection screen trends, in order to avoid damaging the projector screen rear projection hard screen consists of three parts: the diffusion plate, a Fresnel lens, a lenticular diffuser plate: a spreading agent to join the board of propylene made with people's eyes to see the light of the knot Fresnel lens like effect: people have to focus light to a direction, projection screen, reduce the brightness of the screen center and the surrounding poor lenticular effect: the role of the viewing angle has improved double lens (Fresnel lens plus. lenticular lens) making the screen brightness, sharpness can fill the entire screen, the screen with black stripe, you can block out the light scattering, resulting in a high quality image in high contrast projection screen for multimedia systems, multimedia Wuhan equipment (certified), projection screen video provided by Wuhan Engineering Co., Ltd. Jiuhua Wuhan Jiuhua video Engineering Limited (www.jowa-tech.com) is a leader in Wuhan, control and adjustment of the equipment, over the years, the company is implementing the implementation of scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Wuhan Jiuhua video leadership with the staff warmly welcome all inquiries negotiations to create video Jiuhua Wuhan better future.