PROJECTION DISPLAY DEVICE

摘要

PURPOSE: A projection display device is provided to supply a virtual keyboard function to a user by using a light source of a pico projector. CONSTITUTION: A light source unit(110) irradiates light. An image projector(130) generates image by using the lights from the light source. The generated image is projected on a screen. An optical path unit(120) selectively transmits or reflects the light and projects toward the image projector to leakage a part of the light. A virtual keyboard(140) displays a keyboard image having more than one key by using the leakage light from the optical path unit.