本文選題：紅外觸摸屏 + 抗強光��； 參考：《液晶與顯示》2014年02期

【摘要】：紅外觸摸屏通過發(fā)射接收紅外光進行工作,對環(huán)境光照因素的變化比較敏感。在有外界強光照的環(huán)境中使用紅外觸摸屏會受到極大干擾,導致紅外接收管接收到的光強發(fā)生異常,從而引起誤動作。本文研究了采用高頻紅外光的發(fā)射與接收,以鎖相放大方式濾除太陽光的干擾頻段分量,實現(xiàn)了紅外觸控屏的抗直接照射的陽光干擾的方法與驗證結(jié)果。此外,通過改進了鎖相放大器的解調(diào)算法,去掉傳統(tǒng)的鎖相放大后級所必須的濾波電路,電路更加簡潔、可靠。經(jīng)硬件平臺的實際驗證,選頻Q值可以達到145.985,并能在50 000lx的光強下正常工作。該算法能夠?qū)崿F(xiàn)很好的選頻和抗強光效果,達到抗干擾目的。
[Abstract]:Infrared touch screen works by transmitting and receiving infrared light, which is sensitive to the change of environmental illumination factors. Using the infrared touch screen in the environment with strong external illumination will be greatly interfered, resulting in abnormal light intensity received by the infrared receiver, thus causing misoperation. In this paper, the method and the verification results of the infrared touch screen against direct sunlight interference are studied by using the high-frequency infrared light to transmit and receive, and the phase-locked amplification method is used to filter out the interference band of the solar light. In addition, by improving the demodulation algorithm of the phase-locked amplifier, the filter circuit required by the traditional phase-locked amplifier is removed. The circuit is simpler and more reliable. It is verified by the hardware platform that the Q value of frequency selection can reach 145.985 and can work normally under 50 000lx light intensity. This algorithm can achieve very good frequency selection and anti-strong light effect, and achieve the purpose of anti-jamming.
【作者單位】： 電子科技大學電子科學技術(shù)研究院;
【分類號】：TN973

【參考文獻】

相關(guān)期刊論文 前3條

1 李文生;鄧春健;呂q，

本文編號：1849720