触摸屏装配中的全自动对位机开发

发布时间：2019-04-08 14:23

【摘要】：电容式触摸屏是当今市场上最主流的触摸屏,其生产检验流程十分复杂,尤其是显示与触控功能的通电测试,该测试对触摸屏与FPCB(Flexible Printed Circuit board,软性电路板)贴合工艺的要求很高。本文对基于视觉引导的触摸屏与FPCB对位贴合检测系统开展研究,将机器视觉引入触摸屏与FPCB检测贴合工艺中,设计一套新的对位系统方案,抛弃了传统的手动对位模式,以UVW对位平台(平面三自由度并联运动平台)为对位调整机构,借助图像处理以及自动化技术,完成触摸屏与FPCB自动对位贴合机设计。主要工作如下:(1)基于触摸屏与FPCB贴合原理,设计全自动对位机的总体系统框架。设计全新的贴合装置模块将改变原有对位贴合模式,将开环一次对位变为闭环多次对位。通过分析触摸屏与FPCB成像特点,设计特性化视觉采集模块,采用双相机分别采集左右Mark(对位标志)。采用一种简洁的UVW平台设计,使得整个系统运行更加高效。(2)通过建立UVW平台的运动位置模型,得到该平台的运动正解和反解公式。基于UVW平台运动模型本文提出一种特性化标定方法,该方法能够将相机的像素坐标系和UVW平台的坐标系关联起来,标定相机的同时也能验证UVW平台的运动精度,并将两个相机关联到同一个像素坐标系下,同时制定相应的对位策略,利用双相机引导UVW平台进行全闭环对位。(3)根据触摸屏与FPCB成像特点,设计不同的图像处理算法,利用不同的颜色通道提取不同的图像特征。同时提出一种特性化的边缘算法,该算法配合模板匹配,能够快速准确提取直线或圆锥曲线边缘。(4)搭建触摸屏与FPCB全自动对位机试验平台,平台测试证明了本文提出的相关算法能够快速、稳定、准确地识别Mark点。又对UVW平台的对位策略进行试验,结果证明该对位策略快速可行。
[Abstract]:Capacitive touch screen is the most mainstream touch screen on the market today. Its production inspection process is very complex, especially the electric test of display and touch function, which is used to test touch screen and FPCB (Flexible Printed Circuit board,. Soft circuit board (soft circuit board) fitting process requirements are very high. In this paper, the visual-guided touch screen and FPCB alignment detection system is studied, and the machine vision is introduced into the touch screen and FPCB detection alignment process, and a new alignment system scheme is designed, which abandons the traditional manual alignment mode. The UVW platform (planar 3-DOF parallel motion platform) is used as the alignment mechanism. With the aid of image processing and automation technology, the design of touch screen and FPCB auto-alignment machine is completed. The main work is as follows: (1) based on the fitting principle of touch screen and FPCB, the whole system frame of automatic computer is designed. The design of the new fitting device module will change the original alignment mode and change the open-loop one-time alignment into closed-loop multi-position alignment. By analyzing the characteristics of touch screen and FPCB imaging, a special vision acquisition module is designed, and two cameras are used to collect the left and right Mark (counter mark) respectively. A simple design of UVW platform is adopted to make the whole system run more efficiently. (2) the forward and inverse solution formulas of the UVW platform are obtained by establishing the motion position model of the platform. Based on the motion model of UVW platform, this paper presents a characteristic calibration method, which can connect the pixel coordinate system of the camera and the coordinate system of the UVW platform, and verify the accuracy of the motion of the UVW platform while calibrating the camera. The two cameras are connected to the same pixel coordinate system, and the corresponding alignment strategy is made, and the dual camera guided UVW platform is used to carry out the full closed loop alignment. (3) according to the characteristics of touch screen and FPCB imaging, different image processing algorithms are designed. Different color channels are used to extract different image features. At the same time, a characteristic edge algorithm is proposed, which can quickly and accurately extract the edges of straight lines or conic curves with template matching. (4) A fully automatic test platform between touch screen and FPCB is built. The platform test proves that the proposed algorithm can identify Mark points quickly, stably and accurately. The alignment strategy of UVW platform is also tested, and the results show that the alignment strategy is fast and feasible.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TP334.3

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