【摘要】：電容式觸摸屏是當(dāng)今市場(chǎng)上最主流的觸摸屏,其生產(chǎn)檢驗(yàn)流程十分復(fù)雜,尤其是顯示與觸控功能的通電測(cè)試,該測(cè)試對(duì)觸摸屏與FPCB(Flexible Printed Circuit board,軟性電路板)貼合工藝的要求很高。本文對(duì)基于視覺引導(dǎo)的觸摸屏與FPCB對(duì)位貼合檢測(cè)系統(tǒng)開展研究,將機(jī)器視覺引入觸摸屏與FPCB檢測(cè)貼合工藝中,設(shè)計(jì)一套新的對(duì)位系統(tǒng)方案,拋棄了傳統(tǒng)的手動(dòng)對(duì)位模式,以UVW對(duì)位平臺(tái)(平面三自由度并聯(lián)運(yùn)動(dòng)平臺(tái))為對(duì)位調(diào)整機(jī)構(gòu),借助圖像處理以及自動(dòng)化技術(shù),完成觸摸屏與FPCB自動(dòng)對(duì)位貼合機(jī)設(shè)計(jì)。主要工作如下:(1)基于觸摸屏與FPCB貼合原理,設(shè)計(jì)全自動(dòng)對(duì)位機(jī)的總體系統(tǒng)框架。設(shè)計(jì)全新的貼合裝置模塊將改變?cè)袑?duì)位貼合模式,將開環(huán)一次對(duì)位變?yōu)殚]環(huán)多次對(duì)位。通過分析觸摸屏與FPCB成像特點(diǎn),設(shè)計(jì)特性化視覺采集模塊,采用雙相機(jī)分別采集左右Mark(對(duì)位標(biāo)志)。采用一種簡(jiǎn)潔的UVW平臺(tái)設(shè)計(jì),使得整個(gè)系統(tǒng)運(yùn)行更加高效。(2)通過建立UVW平臺(tái)的運(yùn)動(dòng)位置模型,得到該平臺(tái)的運(yùn)動(dòng)正解和反解公式�；赨VW平臺(tái)運(yùn)動(dòng)模型本文提出一種特性化標(biāo)定方法,該方法能夠?qū)⑾鄼C(jī)的像素坐標(biāo)系和UVW平臺(tái)的坐標(biāo)系關(guān)聯(lián)起來,標(biāo)定相機(jī)的同時(shí)也能驗(yàn)證UVW平臺(tái)的運(yùn)動(dòng)精度,并將兩個(gè)相機(jī)關(guān)聯(lián)到同一個(gè)像素坐標(biāo)系下,同時(shí)制定相應(yīng)的對(duì)位策略,利用雙相機(jī)引導(dǎo)UVW平臺(tái)進(jìn)行全閉環(huán)對(duì)位。(3)根據(jù)觸摸屏與FPCB成像特點(diǎn),設(shè)計(jì)不同的圖像處理算法,利用不同的顏色通道提取不同的圖像特征。同時(shí)提出一種特性化的邊緣算法,該算法配合模板匹配,能夠快速準(zhǔn)確提取直線或圓錐曲線邊緣。(4)搭建觸摸屏與FPCB全自動(dòng)對(duì)位機(jī)試驗(yàn)平臺(tái),平臺(tái)測(cè)試證明了本文提出的相關(guān)算法能夠快速、穩(wěn)定、準(zhǔn)確地識(shí)別Mark點(diǎn)。又對(duì)UVW平臺(tái)的對(duì)位策略進(jìn)行試驗(yàn),結(jié)果證明該對(duì)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.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TP334.3

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