US 12,013,602 B2
Method of detecting defective pixels in electronic displays
Zachary Pixley, West Chester, PA (US); Nidhin Davis, Glen Mills, PA (US); and Mark Parsons, West Chester, PA (US)
Assigned to COMMUNICATIONS TEST DESIGN, INC., West Chester, PA (US)
Filed by Communications Test Design, Inc., West Chester, PA (US)
Filed on Dec. 22, 2021, as Appl. No. 17/558,870.
Prior Publication US 2023/0194915 A1, Jun. 22, 2023
Int. Cl. G02F 1/13 (2006.01); G01J 1/18 (2006.01)
CPC G02F 1/1309 (2013.01) [G01J 1/18 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method of detecting a defect in an electronic display, the method comprising:
driving the electronic display to a display a uniform gray color;
capturing a single digital image of the electronic display with a digital camera; and
determining if an area of the electronic display is defective based on the digital image by:
comparing an average luminance of pixels adjacent to a pixel of the digital image to a luminance of the pixel of the digital image;
identifying the pixel of the digital image for further analysis, if the difference in luminance between the pixel of the digital image and the average luminance of adjacent pixels exceeds a threshold; and
for every pixel of the digital image identified for further analysis, determining if a number of other pixels of the digital image identified for further analysis within a predetermined surrounding area exceeds a predetermined number; and
generating a defect map that highlights pixels of the digital image where the predetermined number is exceeded.