Large-size display screen defect detection and positioning method

A defect detection and positioning method technology, applied in the field of display screen, can solve the problems of increased AOI station detection time, complicated positioning process, low robustness, etc., to achieve quality inspection efficiency and product quality control, and save inspection time. , improve the accuracy and the effect of

Active Publication Date: 2019-05-17
WUHAN JINGLI ELECTRONICS TECH +1
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  • Application Information

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Problems solved by technology

Reposition the corner position of the panel sub-picture during each panel inspection, increasing the inspection time of the AOI station
[0012] In addition, in the existing detection process, the defect coordinates are image coordinates, and the positioning process has the disadvantages of being complicated and not robust

Method used

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  • Large-size display screen defect detection and positioning method
  • Large-size display screen defect detection and positioning method
  • Large-size display screen defect detection and positioning method

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Embodiment Construction

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.

[0047] Such as figure 1 The flow chart of a large-size display defect detection and positioning method is shown, and this embodiment uses a liquid crystal screen for illustration:

[0048] 1. Multi-vision sensor offline calibration.

[0049] A liquid crystal screen is used as a reference liquid crystal screen (usually the first detected liquid crystal screen is selected as a reference liquid crystal screen) and moved to the detection station, and the position of the reference liquid crystal screen on the detection station is used as a reference position.

[0050] The screen calibration picture is displayed on the reference liquid crystal screen, and the images of the screen calibration picture are collected by using a plurality ...

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Abstract

The invention relates to the technical field of display screens, in particular to a large-size display screen defect detection and positioning method. The method comprises the following steps of displaying a screen calibration picture on a reference display screen, and acquiring a screen calibration picture image; acquiring off-line calibration parameters for identifying the reference position information from the screen calibration picture image; sequentially displaying detection pictures on a to-be-detected display screen, and carrying out on-line compensation on the position of the to-be-detected display screen by utilizing the off-line calibration parameters in order to obtain position parameters of the to-be-detected display screen; analyzing the collected detection pictures to obtainimage coordinates of a defect; and converting the image coordinates of the defect into screen coordinates according to the position parameters of the to-be-detected display screen. The display of thescreen calibration picture and the extraction of sub-frame angle point information are not needed, and the first detection picture is compensated through the off-line calibration parameters, so thata to-be-detected area of the screen of a panel in the accurate positioning image can be determined, the method is simple and convenient, and the detection time of an AOI workstation can be effectivelyshortened.

Description

technical field [0001] The invention relates to the technical field of display screens, in particular to a defect detection and positioning method for large-size display screens. Background technique [0002] In the field of detection of new display screens such as LCD and OLED, the size is relatively large, such as 4K (3840*2460), 8K (7680×4320) display screens are large-size display screens. In order to make the shooting of the measured object clearer, one display screen pixel corresponds to at least 9 camera pixels, so that the screen pixel defects can be effectively captured. Therefore, the resolution of a single visual sensor cannot effectively capture large-size LCD displays. A plurality of visual sensors means that the display screen is divided into several areas to be detected, and each visual sensor corresponds to the area of ​​the screen to be captured and detected, and the detection results of each sensor are obtained through detection. The detection result incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88G06T7/80G06T7/73
Inventor 罗巍巍林松袁捷宇张胜森郑增强
Owner WUHAN JINGLI ELECTRONICS TECH
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