A mirror assembly for optional rearview and display includes a specific material of a reflective layer. The reflective layer is made of a multi-layer film such as SiO2/metal/SiO2 or TiO2/metal/TiO2, and preferably has a transmittance of 15%˜60%. Accordingly, the driver can see the objects at his side on the mirror via the reflection of the reflective layer as well as the active information provided by the display behind the mirror. The active information includes speed information, turning information and/or backing-up information.