Method and system for recognizing touch point, and display apparatus

PURPOSE: A touch point recognition method, a touch system, and a display device are provided to control an IR(Infrared Radiation) light source corresponding to a touch activation state or a touch deactivation state, thereby reducing unnecessary power consumption. CONSTITUTION: A display device emits an IR signal which penetrates an LCD(Liquid Crystal Display) panel(110) which has a different pattern for each area. A digital pen(200) obtains an IR image corresponding to a touch point by photographing a pattern which penetrates the IR signal through an IR camera. The digital pen recognizes the touch point by using the IR image. When touch starting is sensed, and a sensing signal is transmitted, the display device emits the IR signal by driving IR light sources(130). The touch starting is sensed by a pressure sensor equipped in the digital pen. When pressure is sensed by the pressure sensor during predetermined time, the touch starting is sensed. [Reference numerals] (110) LCD panel; (120) Backlight unit; (130) IR light source; (140) Control unit; (150) Communication unit