An automatic adjustment method, device and system for optically detecting LCD screens
An optical detection and automatic adjustment technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of manual adjustment by operators, and achieve the effects of increasing accuracy, saving labor costs, and saving debugging time
Active Publication Date: 2019-08-16
BEIJING LUSTER LIGHTTECH
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[0005] The purpose of the present invention is to provide an automatic adjustment method, device and system for optical detection of LCD screens, which can solve the problem that operators need to manually adjust after replacing the measured object
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[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0034] An embodiment of the present invention provides an automatic adjustment system for optically detecting LCD screens, such as figure 1 and figure 2 As shown, the system includes: a camera lens holder 11, a camera lens 12, an object distance adjustment device 13, a focus adjustment device 14 and a controller 15;
[0035] The camera lens 12 is used to photograph the measured object.
[0036] The camera lens is an important part of the AOI optical detection syst...
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The invention discloses an automatic adjustment method, device and system for optical detection of LCD (liquid crystal display) screen, relates to the technical field of automatic control and is aimed at solving the problem that manual adjustment of an operator is required after the detected object is changed. The system comprises a camera lens holder, a camera lens, an object distance adjusting device, a focal distance adjusting device and a controller. The method comprises the steps of: obtaining a first image of the detected object in the view field of the camera lens; controlling the focal distance adjusting device to adjust the focal distance, wherein the focal distance is adjusted by generating a focal distance control instruction according to the first image and sending the focal distance control instruction to a zooming motor; controlling the object distance adjusting device to adjust the object distance, wherein the object distance is adjusted by generating an object distance control instruction according to the first image and sending the object distance control instruction to an object distance motor; and after controlling the object distance adjusting device to adjust the object distance, controlling the focal distance adjusting device again to adjust the focal distance according to the adjustment result. The invention is mainly applied to a process of detecting an LCD screen.
Description
technical field [0001] The invention relates to the technical field of automatic control, in particular to an automatic adjustment method, device and system for optical detection of LCD screens. Background technique [0002] AOI (Automatic Optic Inspection, automatic optical inspection), is an emerging inspection technology, which is based on the principle of optics to detect the common defects of an item. Common LCD screen sizes range from 3.5 inches to 7.9 inches, and their corresponding resolutions also range from 960*640 pixels to 2560*1536 pixels. In the process of optically inspecting the LCD screen, in order to ensure the accuracy of the inspection, it is required that one pixel of the inspected LCD screen must correspond to at least 9 pixels of the inspection camera, that is, the larger the ratio of the LCD screen imaging to the camera's field of view, the better. Therefore, if you are inspecting a small screen, the camera needs to be closer to the object to be insp...
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IPC IPC(8): G02F1/13
CPCG02F1/1309
Inventor 杨艺甘春泉赵严
Owner BEIJING LUSTER LIGHTTECH