TY  - JOUR
T1  - GUI-based Autofocusing System for AOI of FPDs
AU - Chun, Kyunghan AU - Kim, Bonghwan AU - Lee, Dongsu AU - Lu, Sun 
JO  - Journal of Engineering and Applied Sciences
VL  - 14
IS  - 16
SP  - 5955
EP  - 5961
PY  - 2019
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2019.5955.5961
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2019.5955.5961
KW  - Autofocus
KW  -AOI
KW  -LCD
KW  -ACF
KW  -Z-axis
KW  -GUI
AB  - In the Flat Panel Display (FPD) industry, Automatic Optical Inspection (AOI) is one of the most
essential processes for inspection of Liquid Crystal Display (LCD) panels. For this purpose, autofocusing is
an important function for which precise moving distance control in μm is required, considering the unit of focal
length of autofocusing equipment. A Z-axis test bench using a step motor was built for autofocusing of the
AOI camera and the moving distance was controlled by a Micro Controller Unit (MCU). A user-friendly Graphic
User Interface (GUI) platform was implemented as the supervising system. The validation test confirmed the
controllable minimum moving distance and verified the equipment reliability through iterative experiments. The
test results can also be used to find the appropriate application range.
ER  -