Optical sensor and manufacturing method

The embodiment of the invention provides an optical sensor and a manufacturing method thereof. According to the embodiment of the invention, the optical sensor comprises an optical sensing layer, a light transmitting layer and a light blocking layer, and the optical sensing layer comprises an optical sensing element array; the light-transmitting layer is coated on the optical sensing layer; the light blocking layer comprises one or more light inlet holes and is coated on the light transmitting layer; wherein the optical sensing layer, the light transmitting layer and the light blocking layer are packaged into a wafer bare chip; light penetrates through the light inlet hole and irradiates the optical sensing element array through the light transmitting layer. According to the optical sensor, the thickness of the optical sensor can be effectively reduced, the size of the optical sensor is reduced, the weight of the optical sensor is reduced, and therefore the application range of the optical sensor is expanded.