- Main function
3 The curtain wall can be freely switched from transparent to opaque. The transparent state can be used for lighting and the power off state can be used for sun shading and privacy protection and can effectively block the infrared rays visible light and ultraviolet rays. 4 Its ultra low energy consumption and life cycle of cold light source is different to other types of advertising media it won’t increase the indoor energy consumption due to the increase of function. 5 It is widely applicated to the new curtain wall and existing curtain wall.