Journal of Advanced Information Technology and Convergence (한국정보기술학회 영문논문지)

Korean Institute of Information Technology (한국정보기술학회)
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Vision Inspection and Correction for DDI Protective Film Attachment

  • Kang, Jin-Su (Department of Electronic Engineering, Kumoh National Institute of Technology) ;
  • Kim, Sung-Soo (NDK) ;
  • Lee, Yong-Hwan (School of Electronic Engineering, Kumoh National Institute of Technology) ;
  • Kim, Young-Hyung (Department of IT Convergence, Kumoh National Institute of Technology)
  • Received : 2020.12.14
  • Accepted : 2020.12.29
  • Published : 2020.12.31
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Abstract

DDI(Display Driver IC) are used to drive numerous pixels that make up display. For stable driving of DDI, it is necessary to attach a protective film to shield electromagnetic waves. When the protective film is attached, defects often occur if the film is inclined or the center point is not aligned. In order to minimize such defects, an algorithm for correcting the center point and the inclined angle using camera image information is required. This technology detects the corner coordinates of the protective film by image processing in order to correct the positional defects where the protective film is attached. Corner point coordinates are detected using an algorithm, and center point position finds and correction values are calculated using the detected coordinates. LUT (Lookup Table) is used to quickly find out whether the angle is inclined or not. These algorithms were described by Verilog HDL. The method using the existing software requires a memory to store the entire image after processing one image. Since the method proposed in this paper is a method of scanning by adding a line buffer in one scan, it is possible to scan even if only a part of the image is saved after processing one image. Compared to those written in software language, the execution time is shortened, the speed is very fast, and the error is relatively small.

Keywords

Acknowledgement

This paper was supported by the National University Development Project in 2020

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