Touch system and method of operating the same

The present disclosure provides a touch system. The touch system includes a window glass having a touch area and a display apparatus spaced apart from the window glass and having a display area corresponding to the touch area of the window glass. A plurality of subareas are defined on the touch area. The display apparatus includes a planar invisible light source configured to emit a first invisible light toward the touch area of the window glass. The touch system further includes a camera device configured to detect a second invisible light reflected from a subarea of the plurality of subareas. The touch system further includes a processor electrically connected to the camera device and configured to retrieve an electrical information of the detected second invisible light. If the electrical information of the detected second invisible light exceeds a threshold, the processor determines that a position on the display area corresponding to the subarea of the plurality of subareas is touched. A method of operat