The light film blackboard is also called LCD blackboard and smart LCD film blackboard. It is a writing tool that can perfectly replace the traditional handwriting board (whiteboard / green board / blackboard, etc.). No pens and inks are required, any hard objects can be used for dust-free writing, no electricity is required for writing, no backlighting, no harm to the eyes, one-key full screen or partial erasure, and the function of "instant saving, synchronous transmission" is also provided, which is a traditional blackboard. , Comprehensive reform of whiteboard and handwriting board.