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Method for detecting broken bright spots in liquid crystal display screen

A technology of a liquid crystal display screen and a detection method, which is applied in the field of defect detection, can solve the problems of low accuracy of the detection method, and achieve the effect of removing dust spots or other interference points and improving the accuracy of detection.

Active Publication Date: 2019-07-12
BEIJING LUSTER LIGHTTECH
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Problems solved by technology

[0006] This application provides a detection method for broken bright spots in a liquid crystal display to solve the technical problem of low accuracy of existing detection methods

Method used

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  • Method for detecting broken bright spots in liquid crystal display screen
  • Method for detecting broken bright spots in liquid crystal display screen

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Embodiment Construction

[0019] The difficulty of foreign matter detection lies in the low contrast between the foreign matter and the background, and the shape of the foreign matter is not uniform, so it is not easy to be found, especially the foreign matter in the Cell segment. However, in addition to low contrast in foreign object detection, dust interference will also bring certain difficulties to foreign object point detection. During manual detection, dust or foreign matter is generally distinguished by wiping, and there is no wiping comparison during automatic detection. The usual detection method: first, the black screen image and the dust screen image are obtained by illuminating the LCD screen through ordinary backlight and side light; The screen image and the dust screen image are processed separately, and the respective foreign matter points in the black screen image and the dust screen image are extracted, and the foreign matter points of the two images are compared to obtain the foreign m...

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Abstract

The invention provides a method for detecting broken bright spots in a liquid crystal display screen, which comprises the following steps of: removing foreign matter spots corresponding to dust in a black picture image by using the foreign matter spots in the dust picture image to acquire a primary target image; processing the primary target image by using structural elements with the different angles, and acquiring all the foreign points in the primary target image; selecting a set of foreign points with the same arrangement direction as the angle direction of the structural elements from allthe foreign points in the primary target image as an initial target foreign matter; removing a set of foreign points which do not meet the preset area and length standards in the initial target foreign matter by adopting a Blob analysis method to acquire a target foreign matter; judging whether the density of the foreign matter points in the target foreign matter meets a preset density standard or not; if so, determining the foreign matter point in the target foreign matter as a broken bright point. According to the method and the device, the foreign object point set which does not meet the preset standard is removed by using the plurality of preset standards, interference points in the image are removed, and the detection accuracy is improved.

Description

technical field [0001] The present application relates to the field of defect detection, in particular to a method for detecting broken bright spots in liquid crystal display screens. Background technique [0002] LCD (Liquid Crystal Display, liquid crystal display) has been widely used in many fields such as mobile phones, tablet computers, and vehicle displays. With the increase of market demand and intensified competition, the quality requirements of customers for LCD are constantly improving, which prompts LCD manufacturers to pay more attention to the quality inspection of LCD. Among them, foreign object detection is the key quality inspection item of LCD. [0003] Among them, the difficulty of foreign object detection lies in the low contrast between the foreign object and the background, and the shape of the foreign object is not uniform, so it is not easy to be found, especially the foreign object in the Cell segment. However, the assembly process of the mobile pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13G01R31/00G06T7/00
CPCG01R31/00G02F1/13G06T7/0004
Inventor 路建伟姚毅
Owner BEIJING LUSTER LIGHTTECH
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