US 11,792,387 B2
Optical correction systems and methods for correcting non-uniformity of emissive display devices
Vyacheslav Shyshkin, Mississauga (CA); and Adam Saechao, Kitchener (CA)
Assigned to Ignis Innovation Inc., Road Town (VG)
Filed by Ignis Innovation Inc., Waterloo (CA)
Filed on Aug. 24, 2022, as Appl. No. 17/894,501.
Application 17/894,501 is a continuation of application No. 17/245,090, filed on Apr. 30, 2021, granted, now 11,457,206.
Application 17/245,090 is a continuation of application No. 15/675,095, filed on Aug. 11, 2017, granted, now 11,025,899, issued on Jun. 1, 2021.
Prior Publication US 2023/0007236 A1, Jan. 5, 2023
Int. Cl. G09G 3/00 (2006.01); G09G 3/3225 (2016.01); H04N 17/04 (2006.01); G01J 1/02 (2006.01); G01J 1/32 (2006.01)
CPC H04N 17/04 (2013.01) [G01J 1/0228 (2013.01); G01J 1/32 (2013.01); G09G 3/006 (2013.01); G09G 3/3225 (2013.01); G09G 2320/0233 (2013.01); G09G 2320/0693 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An optical correction method for correcting for non-uniformity of an emissive display panel having pixels, each pixel having a light-emitting device, the method comprising:
arranging a camera in front of the display panel;
activating a plurality of pixels of the display panel to display:
a first greyscale luminance value of a relatively low greyscale luminance value;
a second greyscale luminance value of a relatively high greyscale luminance value which is spaced apart from the first greyscale luminance value by a relatively large greyscale luminance value difference;
a third greyscale luminance value greater or less than the first greyscale luminance value by a first relatively small greyscale luminance value difference, the relatively large greyscale luminance value difference being greater than said first relatively small greyscale luminance value difference; and
a fourth greyscale luminance value greater or less than the second greyscale luminance value by a second relatively small greyscale luminance value difference, the relatively large greyscale luminance value difference being greater than said second relatively small greyscale luminance value difference,
wherein each activated pixel displays at least one of the first, second, third, and fourth greyscale luminance values, and wherein, for at least one subset of the activated pixels, each pixel displays at least two of the first, second, third, and fourth greyscale luminance values;
measuring a luminance of each activated pixel with the camera while displaying the first, second, third, and fourth greyscale luminance values, to generate luminance measurement data including respectively first, second, third, and fourth luminance measurement data; and
determining correction data from said first, second, third, and fourth luminance measurement data for correcting non-uniformity of images displayed in the display panel.