面向显示墨水打印的基板高精度纠偏及定位  

High precision correction and positioning of the substrate for display ink printing

作　　者：安宁 毕海 李义 徐成 AN Ning;BI Hai;LI Yi;XU Cheng(Ji Hua Laboratory,Foshan 528200,China)

机构地区：[1]季华实验室,广东佛山528200

出　　处：《光学精密工程》2024年第24期3580-3593,共14页Optics and Precision Engineering

基　　金：国家重点研发计划(No.2021YFB3600605)。

摘　　要：在电子纸显示墨水打印中,针对基板偏转角度和像素坑位置计算误差较大的问题,提出了一种高精度基板角度纠偏及定位方法。首先,根据喷墨打印需求搭建了视觉检测系统,用于基板标记的高分辨成像,并通过改进相机内外参标定方法和改进显微成像标定方法,对视觉系统进行了安装角度标定和多相机相对位置标定。然后,对基板标记进行边缘检测、轮廓矩特征计算,提取标记中心像素坐标,并利用坐标转换和最小二乘法直线拟合,实现了基板的高精度纠偏。最后,间接利用基板对位标记,完成了打印起始像素坑定位。实验结果表明,纠偏算法对基板角度的校正误差在±2″以内,像素坑定位误差在±3μm以内,远高于墨水填充的精度要求。通过搭建视觉检测系统和设计基板纠偏及定位算法,实现了显示墨水的高精度、高效率打印填充,提高了打印设备的良率,对显示墨水打印填充设备国产化具有重要的指导意义。Aiming at the problem of large errors in the calculation of the deflection angle of the substrate and the position of the pixel pit in the display ink printing of e-paper,a high-precision substrate angle cor⁃rection and location method was proposed.Firstly,a vision detection system was constructed according to the requirements of inkjet printing,which was used for high-resolution imaging of substrate markings.The installation angle calibration and multi-camera relative position calibration of the vision system were carried out by improving the camera's intrinsic and extrinsic parameter calibration methods and improving the mi⁃croscopic imaging calibration method.Then,edge detection and contour moment feature calculation were performed on the substrate markings,the center pixel coordinates of the markings were extracted,and high-precision substrate correction was achieved using coordinate transformation and least squares line fit⁃ting.Finally,the initial pixel pit positioning was completed by indirectly using the substrate alignment marks.Experimental results show that the correction error of the substrate angle correction algorithm is within±2″,and the pixel pit positioning error is within±3μm,far exceeding the accuracy requirements of ink filling.By establishing a vision detection system and designing substrate correction and positioning algorithms,high-precision and efficient printing filling of display ink were achieved,improving the yield of printing equipment,which is of great guiding significance for the localization of display ink printing and fill⁃ing equipment.

关 键 词：墨水打印 多相机标定 角度纠偏 像素坑定位 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术] TH161.7[自动化与计算机技术—计算机科学与技术]