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US 11,457,206 B2Granted
Optical correction systems and methods for correcting non-uniformity of emissive display devices
AssigneeIgnis Innovation Inc.
InventorsVyacheslav Shyshkin, Adam Saechao
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Abstract
What is disclosed are systems and methods of optical correction for pixel evaluation and correction for active matrix light emitting diode device (AMOLED) and other emissive displays. Optical correction for correcting for non-homogeneity of a display panel uses sparse display test patterns in conjunction with a defocused camera as the measurement device to avoid aliasing (moiré) of the pixels of the display in the captured images.
Claims22
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;
- displaying from each pixel of a first sparse set of activated pixels of the display:
- a first greyscale luminance value of a relatively low greyscale luminance value, and
- 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;
- displaying from pixels of a second sparse set of activated pixels of the display:
- 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,
- displaying from pixels of a third sparse set of activated pixels of the display:
- 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;
- measuring a luminance of each pixel of the first, second, and third sparse sets of activated pixels of the display with the camera while displaying the first greyscale luminance, the second greyscale luminance, the third greyscale luminance, and the fourth greyscale luminance, to generate luminance measurement data including respectively first luminance measurement data, second luminance measurement data, third luminance measurement data, and fourth luminance measurement data;
- and
- determining from said luminance measurement data with use of a determined comparison between the first and third luminance measurement data and a determined comparison between the second and fourth luminance measurement data, correction data for correcting non-uniformity of images displayed in the display panel.
8 more elements
An optical correction system for correcting non-uniformity of an emissive display having pixels, each pixel having a light-emitting device, the system comprising:
- a camera arranged in front of the display for capturing images of the display panel while each pixel of a first sparse set of activated pixels of the display displays:
- a first greyscale luminance value of a relatively low greyscale luminance value, and
- 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;
- and while each pixel of a second sparse set of activated pixels of the display displays:
- 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 value difference being greater than said first relatively small greyscale luminance value difference;
- and while each pixel of a third sparse set of activated pixels of the display displays:
- 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;
- and
- optical correction processing coupled to the camera and for
- receiving from the camera captured images of each pixel of the first, second, and third sparse sets of activated pixels of the display while displaying the first greyscale luminance, the second greyscale luminance, the third greyscale luminance and the fourth greyscale luminance, to generate luminance measurement data including respectively first luminance measurement data, second luminance measurement data, third luminance measurement data, and fourth luminance measurement data;
- determining from said luminance measurement data, correction data with use of a determined comparison between the first and third luminance measurement data and a determined comparison between the second and fourth luminance measurement data for correcting non-uniformity of images displayed in the display;
- and
- transmitting the correction data to the display for storage in a memory of the display.
10 more elements
Dependencies are inferred from the claim text.