高分辨率多点触控红外触摸屏设计

发布时间：2018-01-02 11:45

本文关键词：高分辨率多点触控红外触摸屏设计　出处：《液晶与显示》2015年01期 　论文类型：期刊论文

【摘要】：红外触摸屏是大尺寸触摸屏的首选方案,但是实际应用中红外触摸屏普遍存在分辨率不高、响应速度较慢的不足,而且生产环节存在加工组装复杂的弊端。针对以上不足,提出了一种红外屏设计方案。硬件部分设计了二维选通红外扫描电路、接收电路和滤波电路,实现了发射与接收电路的模块化,为加工组装提供了便利。软件部分首先提出了脉冲式红外扫描方式,并给出了基于STM32F205片内Timer和ADC的脉冲扫描实现方法,提高了红外屏的扫描速度;然后介绍了细分扫描的设计思路,并通过二次细分扫描在不增加硬件成本的基础上提高了红外屏触点的定位精度。最后介绍了支持多点触摸的HID报告描述符的实现方法,实现了红外屏免驱安装。实际证明,该设计方案降低了加工制造复杂度,实现了红外屏即插即用,有效地提高了红外触摸屏的分辨率和响应速度。
[Abstract]:Infrared touch screen is the first choice of large size touch screen, but in practical application, the infrared touch screen has the deficiency of low resolution and slow response speed. In addition, there are some disadvantages in the production process and assembly. In view of the above shortcomings, a design scheme of infrared screen is proposed. The hardware part designs two-dimensional gated infrared scanning circuit, receiving circuit and filtering circuit. The modularization of the transmitting and receiving circuits is realized, which provides convenience for processing and assembly. Firstly, the pulse infrared scanning mode is proposed in the software part. The realization method of pulse scanning based on Timer and ADC in STM32F205 chip is given, and the scanning speed of infrared screen is improved. Then the design idea of subdivision scanning is introduced. Furthermore, the positioning accuracy of infrared contact is improved without increasing hardware cost by secondary subdivision scanning. Finally, the implementation method of HID report descriptor supporting multi-touch is introduced. It is proved that the design reduces the manufacturing complexity, realizes the infrared screen plug and play, and effectively improves the resolution and response speed of the infrared touch screen.
【作者单位】：电子科技大学中山学院;电子科技大学计算机科学与工程学院;
【基金】：国家自然科学基金项目(No.61302115) 广东省自然科学基金(No.S2013010015764) 广东省高等学校优秀青年教师培养计划(Yq2013204) 中山市产学研项目(No.2013C2FC0019)(No.2013C2FC0014)
【分类号】：TN873
【正文快照】： 1引言在电阻式、电容式、红外式和表面声波式等众多触控交互技术中,红外式触控技术以其透光率高、防刮性能好、尺寸易扩展、寿命长等优势成为大尺寸触摸屏的首选方案。大尺寸红外式触摸屏在电子白板、博彩设备以及游戏游艺等行业应用非常广泛,特别是随着大屏幕LED全彩显示屏产

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