Inspection method and inspection machine for display panel

An inspection method for a display panel, the inspection method comprising the steps of:

• taking a picture of a to-be-inspected display panel to obtain a to-be-inspected image of the to-be-inspected display panel;
• removing high-frequency information in the to-be-inspected image to obtain a high-frequency-removed image;
• calculating a difference between the to-be-inspected image and the high-frequency-removed image to obtain a difference image;
• making a determination regarding the difference image by comparing the difference image with a preset threshold, determining that the display panel fails the inspection if the difference image exceeds the preset threshold, and determining that the display panel passes the inspection if the difference image does not exceed the preset threshold:
• searching for a brightness value of a pixel in the difference image which has a maximum brightness;
• calculating, according to the brightness value of the pixel having the maximum brightness, an image magnification coefficient for enhancing the difference picture to a maximum brightness value:
• enhancing the difference image according to the image magnification coefficient to obtain the enhanced image;
• and
• determining a position where poor displaying occurs according to the enhanced image.

An inspection machine, comprising:

• an image acquiring circuit configured to take a picture of a to-be-inspected display panel to obtain a to-be-inspected image of the to-be-inspected display panel;
• a filtering circuit configured to remove high-frequency information in the to-be-inspected image obtained by the image acquiring circuit to obtain a high-frequency-removed image;
• a difference calculating circuit configured to calculate a difference between the to-be-inspected image obtained by the image acquiring circuit and the high-frequency-removed image obtained by the filtering circuit to obtain a difference image;
• and
• a determining circuit configured to make a determination regarding the difference image of the difference calculating circuit by comparing each pixel in the difference image obtained by the difference calculating circuit with each pixel in a preset reference image, determine that the display panel fails the inspection if the difference image exceeds an image value of the preset reference image, and determine that the display panel passes the inspection if the difference image does not exceed the image value of the preset reference image.