红外原理（Infrared principle）.doc

红外原理（Infrared principle） Enterprise individual user name password forgot password? The station style setting: Exhibition | | News Forum blog home market | special products | | | interview | Nikkei electronics technical articles | solutions | hot technology | beginners download | | pages | talent high resolution infrared touch screen type I2C bus design based on the author: Zhang Ming Huang Ziqiang School of photoelectric information time - Chengdu electronic Science University of Technology: 2008-08-28 source: electronic design application Abstract: This paper proposes a method to improve the infrared touch screen resolution, and gives the system structure and each part of the circuit design. In this paper, the simulation method of periodic signal can effectively improve the resolution of infrared touch screen. The experimental results show that LED has obvious voltage change at different shielding levels. When the touch object moves 0.3mm, the voltage changes over 0.12V, while the 8 bit ADC can achieve the resolution of 2.5V voltage of 0.01V. The infrared touch screen circuit with this technology has stronger capability of resisting external light interference. Key words: infrared touch screen, resolution, I2C bus introduction, with the large-scale application of flat panel display and the emergence of large screen flat panel display, infrared touch screen has been widely used. At the same time, the further improvement of resolution becomes the key to apply infrared touch screen to large screen. This paper proposes a method to improve the resolution of infrared touch screen. The working principle of the system structure and working principle of the system of infrared touch screen is the basic principle of beam blocking technology, it does not need to cover any material in the surface of the display and the original, only in the display screen placed around a frame. An infrared light emitting diode (LED) is mounted on the two opposite sides of the frame, and an infr