Abstract: Disclosed is an oral scanner which is inserted into a patient's mouth and scans the patient's mouth by means of non-contact manner to generate a three-dimensional model and a three-dimensional overlay image display method using the same. The oral scanner includes a projector which irradiates a source light source including a visible light source and an IR light source; a camera which acquires a three-dimensional image for a mouth surface and an IR image for an inside of the gingiva to sense reflected light for the source light source; and an image processor which combines the IR image and the three-dimensional image to generate a three-dimensional duplication model, wherein the IR image is irradiated in the mouth to be overlaid by the projector based on the three-dimensional duplication model.

Abstract: There is provided a touch screen system including: a sensor module including a light emitting unit configured to generate a light signal and a photo detection sensor configured to receive the light signal; a display panel including the sensor module; a front case including a reflection area configured to reflect the light signal generated from the light emitting unit to the photo detection sensor; and a back case connected to the front case with the display panel positioned therebetween. The front case is fixed and connected to the back case and the reflection area is placed at a predetermined position on the display panel.