| 摘要 |
Disclosed are an optical touch input device which divisionally adjusts optical output of a light emitting unit before and during a touch operation to reduce power consumption, and a driving method thereof. The optical touch input device includes a display panel 70, a plurality of infrared light emitting elements 110 disposed on two adjacent sides of the display panel, a lens unit 155 disposed on the remaining two adjacent sides of the display panel and reflecting light emitted from the infrared light emitting elements, a light receiving unit 120 disposed on the two adjacent sides of the display panel, and a touch control unit 180 including a touch coordinate calculation unit 130 to calculate a set of coordinates of a touch point and a light emission control unit 112 to divide optical outputs of the infrared light emitting elements into optical output during touch and optical output during non-touch and to lower the optical output during non-touch. Light emitting elements may be divided into elements in which a touch is sensed and elements in which touch is not sensed. Optical output may only be lowered for the emitting elements in which touch is not sensed. |
