Method and device for detecting internal dust of liquid crystal screen

Abstract

The embodiment of the invention discloses a method and a device for detecting internal dust of a liquid crystal screen. A horizontally arranged liquid crystal screen is vertically illuminated by parallel light from bottom to top; the liquid crystal screen is lighted to show a white image; an image acquiring device positioned above the liquid crystal screen is used for acquiring an image of the liquid crystal screen for the first time and recording coordinates of black points in the image. An auxiliary polaroid parallel to the liquid crystal screen is transferred to a position between the image acquiring device and the liquid crystal screen, and the polarization angle of the auxiliary polaroid is enabled to be vertical to that of a polaroid arranged on the liquid crystal screen. The liquid crystal screen is regulated to a black image; at one side end of the liquid crystal screen, a region between the polaroid on the liquid crystal screen and the auxiliary polaroid is illuminated by diffused light, and the image acquiring device is used for acquiring the image for the second time and recording the coordinates of bright points in the image. Whether dust exists inside the liquid crystal screen or not is determined according to the quantity of overlapped coordinates of the bright points in the image acquired for the second time and the black points in the image acquired for the first time. The method and the device disclosed by the invention have the advantage of greatly reducing the false detection rate of detection for internal dust of the liquid crystal screen.

Description

technical field [0001] The invention relates to the field of liquid crystal display detection, in particular to a method and device for detecting dust inside a liquid crystal display. Background technique [0002] The LCD screen includes liquid crystal glass and two polarizers. For the liquid crystal glass in a flat state, one polarizer is attached to the upper surface of the liquid crystal glass, and the other is attached to the lower surface of the liquid crystal glass. In order to reduce the dust falling between the polarizer and the liquid crystal glass, the process of attaching the polarizer is usually carried out in a clean room. Although the cleanliness of the cleanroom is very high, the sports environment in the cleanroom is still naturally dusty and will be polluted by the human body, thus producing light-emitting films and metabolized liquid crystals If there is no access between the glass and the material, it is possible to avoid carrying dust and dust on the gr...

AI Technical Summary

Problems solved by technology

Therefore, in the inspection of the LCD screen, the dust on the upper surface of the LCD screen will be mistaken for the dust ins

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