STRUCTURAL AND LOW-FREQUENCY NON-UNIFORMITY COMPENSATION

• US 20140225938A1
• Filed: 04/17/2014
• Published: 08/14/2014
• Est. Priority Date: 11/29/2011
• Status: Active Grant

• Current Assignee: IGNIS Innovation Incorporated
• Original Assignee: IGNIS Innovation Incorporated
• Inventors: Soni, Jaimal, Ngan, Ricky Yik Hei, Chaji, Gholamreza, Zahirovic, Nino, Dionne, Joseph Marcel, Tian, Baolin, Giannikouris, Allyson
• Granted Patent: US 10,089,924 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2320/0295 by monitoring each display pixel
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 2360/14 Detecting light within display terminals, e.g. using a single or a plurality of photosensors
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

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.

Claims

1. A method of compensating for structural non-uniformities in an array of solid state devices in a display panel, said method comprising

displaying images in the panel,

extracting the outputs of a pattern based on structural non-uniformities of the panel, across the panel, for each area of the structural non-uniformities,

quantifying the non-uniformities based on the values of the extracted outputs, and

modifying input signals to the display panel to compensate for the non-uniformities.

2. The method of claim 1 in which the extracting is done with image sensors associated with a pattern matching the structural non-uniformities.

3. The method of claim 2 in which said image sensors are optical sensors.

4. The method of claim 1 in which said non-uniformities are modified at multiple response points by modifying said input signals, and which includes using those response points to interpolate an entire response curve for the display panel, and using said response curve to create a compensated image.

5. The method of claim 1 in which black values are inserted for selected areas of said pattern to reduce the effect of optical cross talk.

6. A method of compensating for random non-uniformities in an array of solid state devices in a display panel, said method comprising

extracting low-frequency non-uniformities across the panel by applying patterns,

taking images of the pattern,

adjusting the area and resolution of the image to match the panel by creating values for pixels in the display, and

compensating low-frequency non-uniformities across the panel based on said created values.

7. A method of compensating for 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 using patterns matching the structural non-uniformities,

compensating for the structural non-uniformities,

extracting low-frequency non-uniformities by applying flat field and extracting the patterns, and

compensating for the low-frequency non-uniformities.