Patent ID: 9405405
Filing Date: 2016-08-02
CPC Classification: G03B,G06F,H04N

Claim Text:
1. An optical projection and image sensing apparatus for projecting an image light to display an image on a screen and sensing a variation of a sensing light from the image on the screen when a user touches the screen, the optical projection apparatus comprising: a light source, for providing an illumination light; a single light valve, disposed on an optical path of the illumination light, for converting the illumination light to the image light with multicolor; a first lens set, disposed on an optical path of the image light, for projecting the image light to display the image on the screen; a sensing module with at least one photosensitive device, for sensing the sensing light from the image on the screen, wherein the sensing light is visible light, wherein an angle between the image light emitted from the light valve and the sensing light striking onto the sensing module is not equal to 0 degree or 90 degrees; and a beam splitter, disposed on the optical path of the image light and the optical path of the sensing light, and between the light valve and the first lens set, the beam splitter being used to reflect the sensing light to the sensing module, wherein the sensing module is disposed on the optical path of the sensing light, wherein the at least one photosensitive device receives the sensing light that is the same as the variation of a sensing light from the image on the screen to achieve the effect of the user touching the screen, wherein the sensing light from the image on the screen is not focused back to the light valve, and the beam splitter is a total internal reflection prism.