Structural and low-frequency non-uniformity compensation
A system for compensating for non-uniformities in an array of solid state devices in a display panel displays images in the panel, and extracts the outputs of a pattern based on structural non-uniformities of the panel, across the panel, for each area of the structural non-uniformities. Then the structural non-uniformities are quantified, based on the values of the extracted outputs, and input signals to the display panel are modified to compensate for the structural non-uniformities. Random non-uniformities are compensated by extracting low-frequency non-uniformities across the panel by applying patterns, and taking images of the pattern. The area and resolution of the image are adjusted to match the panel by creating values for pixels in the display, and then low-frequency non-uniformities across the panel are compensated, based on the created values.
1. A method of compensating for display non-uniformities due to structural non-uniformities of a display panel including an array of solid state devices, said method comprising:
displaying in the display panel at least one image matching one or more non-uniformity patterns due to the structural non-uniformities of the display panel;
extracting values quantifying said one or more non-uniformity patterns; and
modifying input signals to the display panel with use of said extracted values to compensate for the display non-uniformities due to said structural non-uniformities.
2. The method of claim 1 , further comprising prior to displaying, generating said at least one image based on one or more expected non-uniformity patterns due to said structural non-uniformities, each image of the at least one image matching at least one of the one or more expected non-uniformity patterns.
3. The method of claim 1 , wherein at least one of the one or more non-uniformity patterns is a spatially repeating pattern.
4. The method of claim 1 , wherein at least one of the one or more non-uniformity patterns is substantially a spatial repetition of another of the one or more non-uniformity patterns.
5. The method of claim 1 , in which said extracting is performed with use of image sensors in spatial association with the one or more non-uniformity patterns.
6. The method of claim 5 , wherein said image sensors are optical sensors.
7. The method of claim 1 , wherein black values are inserted for selected areas of said at least one image to reduce the effect of optical cross talk.
8. A method of compensating for display non-uniformity in an array of solid state devices in a display panel, said method comprising:
extracting values quantifying one or more non-uniformity patterns due to structural non-uniformities of the display panel with use of at least one image matching the one or more non-uniformity patterns due to the structural non-uniformities of the display panel; and
compensating for the display non-uniformity with use of said extracted values.
9. The method of claim 8 , wherein at least one of the one or more non-uniformity patterns due to the structural non-uniformities of the display panel is a spatially repeating pattern.
10. The method of claim 8 , wherein at least one of the one or more non-uniformity patterns due to the structural non-uniformities of the display panel is substantially a spatial repetition of another of the one or more non-uniformity patterns due to the structural non-uniformities of the display panel.
11. The method of claim 8 , further comprising:
extracting low-frequency non-uniformities across the display panel by displaying patterns matching the low-frequency non-uniformities;
taking images of the displayed patterns using an array of optical sensors;
adjusting the spatial area and spatial resolution of the images to match the display panel by creating values for pixels in the display; and
compensating low-frequency non-uniformities across the panel based on said created values.
12. A method of compensating for display non-uniformities in an array of solid state devices in a display panel, said method comprising:
creating target points in the input-output characteristics of the panel;
extracting structural non-uniformities by optical measurement of images based on one or more non-uniformity patterns due to structural non-uniformities of the display panel; and
compensating for the structural non-uniformities.
13. The method of claim 12 , wherein at least one of the one or more non-uniformity patterns due to the structural non-uniformities of the display panel is a spatially repeating pattern.
14. The method of claim 12 , wherein at least one of the one or more non-uniformity patterns due to the structural non-uniformities of the display panel is substantially a spatial repetition of another of the one or more non-uniformity patterns due to the structural non-uniformities of the display panel.
15. The method of claim 12 , in which extracting is performed with optical sensors in spatial association with spatial patterns matching the one or more non-uniformity patterns due to the structural non-uniformities of the display.
16. The method of claim 12 , further comprising:
extracting low-frequency non-uniformities by displaying a flat field and extracting values quantifying the patterns matching the low-frequency non-uniformities, and
compensating for the low-frequency non-uniformities.