液晶与显示
液晶與顯示
액정여현시
CHINESE JOURNAL OF LIQUID CRYSTALS AND DISPLAYS
2015年
3期
472-483
,共12页
红外触摸屏%抗强光%并行扫描%选频接收%无源晶振
紅外觸摸屏%抗彊光%併行掃描%選頻接收%無源晶振
홍외촉모병%항강광%병행소묘%선빈접수%무원정진
infrared touch screen%anti-light interference%parallel scanning%frequency selective circuits%crystal
红外触摸屏是通过红外发射管和红外接收管收发红外光来进行触摸位置的判断，其工作原理决定了太阳光会对它产生干扰.采用串行扫描方式的抗强光红外触摸屏的扫描周期很长.本文采用30．072 kHz、36 kHz、38 kHz、38．4 kHz、40 kHz、48 kHz、50 kHz、51．2 kHz无源晶振分别设计并行扫描模块中红外发射管的信号源和红外接收电路的选频器.模块实现了8个检测通道的同时工作.提高了红外触摸屏抗强光能力，解决了相邻8个红外发射管同时工作而产生的串扰问题，缩短了扫描周期.
紅外觸摸屏是通過紅外髮射管和紅外接收管收髮紅外光來進行觸摸位置的判斷，其工作原理決定瞭太暘光會對它產生榦擾.採用串行掃描方式的抗彊光紅外觸摸屏的掃描週期很長.本文採用30．072 kHz、36 kHz、38 kHz、38．4 kHz、40 kHz、48 kHz、50 kHz、51．2 kHz無源晶振分彆設計併行掃描模塊中紅外髮射管的信號源和紅外接收電路的選頻器.模塊實現瞭8箇檢測通道的同時工作.提高瞭紅外觸摸屏抗彊光能力，解決瞭相鄰8箇紅外髮射管同時工作而產生的串擾問題，縮短瞭掃描週期.
홍외촉모병시통과홍외발사관화홍외접수관수발홍외광래진행촉모위치적판단，기공작원리결정료태양광회대타산생간우.채용천행소묘방식적항강광홍외촉모병적소묘주기흔장.본문채용30．072 kHz、36 kHz、38 kHz、38．4 kHz、40 kHz、48 kHz、50 kHz、51．2 kHz무원정진분별설계병행소묘모괴중홍외발사관적신호원화홍외접수전로적선빈기.모괴실현료8개검측통도적동시공작.제고료홍외촉모병항강광능력，해결료상린8개홍외발사관동시공작이산생적천우문제，축단료소묘주기.
Infrared touch screen works through light emitting diode transmitting infrared light and in-frared receiver diode receiving infrared light,so the sunlight will have interference to it.Scanning pe-riod of anti-light infrared touch screens which use serial scanning mode is too long.Eight kinds of crystal ———30.072 kHz,36 kHz,38 kHz,38.4 kHz,40 kHz,48 kHz,50 kHz,51.2 kHz are used to design signal sources of infrared emission diodes.Then,the same frequency crystals are used to de-sign frequency selective circuits.The design make eight scanning units working simultaneously come true.It enhances the anti-light ability of IR touch screen and solves the problem of interference among the eight infrared transmitting diode in parallel scanning mode,reducing scan cycle.
