| 摘要 |
PURPOSE: A touch screen system capable of recognizing the coordinate of the infrared ray pen is provided to be conveniently attached to a beam projector or a screen, regardless of the types, thereby remarkably reducing the human and physical cost of the attachment. CONSTITUTION: An image output unit (110) treats an image signal which is inputted from a computer (200) and outputs on a screen (100). An infrared ray pen (120) includes the light-emitting body and emits the infrared ray when being contacted with the screen. A first infrared camera unit and a second infrared camera unit (141,151) are installed at both corners of the screen to receive the infrared ray. If an output signal level of the first and the second infrared camera unit is an upper standard signal level, a determining unit determines the sensing of the infrared ray pen. A location calculation unit analyzes the output signal of the first and the second infrared camera unit when sensing of the infrared ray pen, and generates the location information of the infrared ray pen. |
