Touch system and method of operating the same

A touch system, comprising:

• a window glass;
• a display apparatus spaced apart from the window glass, wherein the display apparatus includes a screen, a backlight configured to emit a visible light toward the screen, and an invisible light source configured to emit an invisible light toward the window glass, wherein the invisible light source is integrated in the backlight;
• a camera device configured to capture one or more optical information of the window glass;
• and
• a processor electrically connected to the camera device and configured to determine whether a first position on the window glass corresponding to a second position on the display apparatus is touched based on the one or more optical information of the window glass, and the first position on the window glass is space apart from the second position on the display apparatus;
• wherein the window glass is physically separated from the display apparatus;
• wherein the camera device is arranged close to peripheral of the display apparatus and between the window glass and the display apparatus in a side view of the touch system.

A method of operating a touch system with a window glass comprising a touch area divided into a plurality of subareas, comprising:

• emitting an invisible light toward the touch area of the window glass through a screen of a display apparatus;
• capturing one or more optical information of the window glass from a reflected invisible light, without passing through the screen of the display apparatus, from the touch area of the window glass;
• and
• determining a corresponding position on a display apparatus physically separated from the window glass based on the one or more optical information of the window glass.