Curved-surface screen edge outer arc defect detection method based on laser ranging

Abstract

The invention provides a curved-surface screen edge outer arc defect detection method based on laser ranging, which relates to the field of curved-surface OLED screen edge outer arc defect detection. The method comprises the following steps of 1, placing a curved-surface screen product on a height-adjustable platform which is slightly wider than the screen, 2, installing laser arrays on the two sides of the platform, adjusting the elevation angle of the laser arrays in a high-precision mode, and installing a laser receptor above the platform, and 3, adjusting the height of the platform. According to the method, the optical property of the curved-surface part of the screen is utilized, the laser array is used for emitting laser, the laser is kept tangent to the outer arc edge of the screen, and the screen is moved in the radial direction, if the outer arc of a product has flaws, an outer mold is uneven, the laser emitting angle is changed, and a receptor is used for capturing the laser emitting angle change, namely the defect position; high-precision curved-surface screen outer arc part modeling can be realized, and measurement errors caused by using structured light are avoided.

Description

technical field [0001] The invention relates to the field of defect detection for edge outer arcs of curved OLED screens, in particular to a method for detecting edge outer arc defects of curved screens based on laser distance measurement. Background technique [0002] In order to achieve high-precision automatic detection of glass panels for curved electronic display screens. In China's use of new patent specification CN201611207618.0, a method of using periodic stripe structured light to perform high-precision detection on the larger curvature of the glass panel with arc edges is developed. This method projects two sets of periodic striped structured light onto a curved glass surface parallel to the short side of the screen. By detecting the gradient data of periodic fringe structured light, using the mean value and standard deviation to determine the threshold, the information that contains but appears to be high frequency is extracted. Finally, the distribution of defe...

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Problems solved by technology

[0003] However, since the edge material of the curved screen product is an optical glass panel, the cross-sectional shape is a curved surface

The traditional method is based on the principle of reflected light or transmitted light intensity detection, which is easily affected by the optical properties of the screen edge material. Using the traditional planar optical sensor to shoot the edge of the curved screen requires correction of the distortion before the image is detected. The distortion correction process requires the use of interpolation Fill the vacant pixels, and the interpolation calculation is generated by adjacent pixel values, which is easy to weaken the defect characteristics and generate errors

If the scheme of the new patent specification CN201611207618.0 is adopted, the structured light distribution is easily reflected and refracted by the lens at the outer edge of the screen, which eventually leads to measurement deviation

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