Method of more quickly calibrating display panels and calibration apparatus for performing the same

A method of compensating an image of a display panel, the method comprising:

• capturing a plurality of full pattern images corresponding to a plurality of full grayscales, each full pattern image being the image of an entire display area of the display panel;
• measuring luminance and color of a plurality of full pattern images corresponding to a plurality of full grayscales, each of the full pattern images including a single full grayscale of the full grayscales;
• measuring luminance and color of a multi pattern image, the multi pattern image including a plurality of multi grayscales;
• generating a first compensating value to displace a position of a multi grayscale region in the multi pattern image to a central portion of the multi pattern image;
• compensating luminance and color of input image data based on the input image data, the luminance and the color of the full pattern image, the luminance and the color of the multi pattern image and the first compensating value to generate a data signal;
• and
• displaying an image on the display panel based on the data signal,
• wherein the first compensating value is generated using a high full image and a low full image, the high full image having a high full grayscale which is one of the full grayscales greater than and adjacent to a multi grayscale of the multi grayscale region, the low full image having a low full grayscale which is one of the full grayscales less than and adjacent to the multi grayscale of the multi grayscale region,
• wherein the generating of the first compensating value comprises:
• determining a first difference between a measured value of the high full grayscale at a first position and a measured value of the high full grayscale at a second position in the high full image and a second difference between a measured value of the low full grayscale at the first position and a measured value of the low full grayscale at the second position in the low full image, the first position being the central portion of the multi pattern image, the second position being the position of the multi grayscale region;
• and
• linearly interpolating the first difference and the second difference using the high full grayscale, the multi grayscale of the multi grayscale region and the low full grayscale.

A display apparatus comprising:

• a timing controller configured to compensate luminance and color of input image data to generate a data signal based on the input image data, luminance and color of a plurality of full pattern images corresponding to a plurality of full grayscales, luminance and color of a multi pattern image and a first compensating value to displace a position of a multi grayscale region in the multi pattern image to a central portion of the multi pattern image, each of the full pattern images including a single full grayscale of the full grayscales, the multi pattern image including a plurality of multi grayscales;
• a data driver configured to convert the data signal into a data voltage having an analog type;
• and
• a display panel configured to display an image based on the data voltage,
• wherein each full pattern image is a captured image of an entire display area of the display panels,
• wherein the first compensating value is generated using a high full image and a low full image, the high full image having a high full grayscale which is one of the full grayscales greater than and adjacent to a multi grayscale of the multi grayscale region, the low full image having a low full grayscale which is one of the full grayscales less than and adjacent to the multi grayscale of the multi grayscale region,
• wherein, to generate the first compensating value, the timing controller is configured to:
• determine a first difference between a measured value of the high full grayscale at a first position and a measured value of the high full grayscale at a second position in the high full image and a second difference between a measured value of the low full grayscale at the first position and a measured value of the low full grayscale at the second position in the low full image, the first position being the central portion of the multi pattern image, the second position being the position of the multi grayscale region, and
• linearly interpolate the first difference and the second difference using the high full grayscale, the multi grayscale of the multi grayscale region and the low full grayscale.

A machine implemented and automated method for quickly determining luminance and color compensation values for a display panel having a display area populated by a matrix of pixels, where each pixel is independently drivable over a predetermined range of grayscales, the method comprising:

• first driving all the pixels with a first single full grayscale signal to thereby produce a corresponding first full screen image and using a sensor array to measure luminance and color attributes of the produced first full screen image;
• second driving all the pixels with a different second single full grayscale signal to thereby produce a corresponding second full screen image and using the sensor array to measure luminance and color attributes of the produced second full screen image;
• third driving only a subset of the pixels of the display area with a corresponding multi pattern signal to thereby produce a corresponding multi pattern image having a predetermined spatial arrangement of darker and lighter regions and using the sensor array to measure respective luminances and color attributes of the respective and spatially arranged darker and lighter regions of the multi pattern image corresponding to only the subset of the pixels;
• using the measured luminances and color attributes of the multi pattern image and of the first and second full screen images to generate luminance and color calibrating factors for the display panel.