The mobile phone can project the screen onto the wall by connecting the projector. If it is a smart projector, as long as the mobile phone and the smart projector are in the same local area network, and then connected to the projector through the wireless screen splitting function in the mobile phone, the screen of the mobile phone can be projected onto the wall through the projector.

A projector is an optical instrument, which uses optical elements to enlarge the outline of a workpiece and project it onto a screen. The profile can be measured by transmitted light, and the surface shape of blind holes and the surface of parts can also be measured by reflected light. The projector is especially suitable for measuring complex contours and small workpieces, such as clock parts, stamping parts, electronic components, templates, molds, threads, gears and molding tools, with high detection efficiency and convenient use. It is widely used in measuring rooms and production workshops, especially in meeting occasions of instrument industry.

Reference: 360 Encyclopedia-Projector