Method for compensating display device

Abstract

A method for compensating a display device includes: displaying a first display image of a calibration pattern; generating a first photo image of the calibration pattern by capturing the first display image; generating measured representative position data corresponding to the calibration pattern by measuring the first photo image; generating third-order fitting representative position data by performing two-dimensional third-order fitting; displaying a second display image of an all-white display; generating a second photo image of an all-white display by capturing the second display image; generating a first cropped image by performing size adjustment based on the third-order fitting representative position data; calculating a brightness compensation value by comparing the measured brightness of the first cropped image with a target brightness; and generating compensated image data by applying the brightness compensation value to image data.

Claims

1. A method for compensating a display device, the method comprising the following steps: displaying a first display image of a calibration pattern using a display device, the display device comprising a plurality of display sub-pixels; generating a first photographic image of the calibration pattern by capturing the first display image with a camera, the camera comprising a plurality of sensor sub-pixels; generating measured representative position data corresponding to the calibration pattern by measuring the first photographic image; generating third-order fitted representative position data by performing a two-dimensional third-order fitting on the measured representative position data; Using the display device to display a second display image displayed in full white; generating a second photo image of the all-white display by capturing the second display image using the camera; generating a first cropped image by performing a first resizing of the second photo image based on the third-order fitting representative position data; calculating a brightness compensation value by comparing the measured brightness of the first cropped image with a target brightness; as well as Compensated image data is generated by applying the brightness compensation value to the image data.

2. The method according to claim 1, wherein The fitting surfaces of the x-axis and y-axis according to the two-dimensional third-order fitting are expressed by the following formula: Fitting surface (x, y) = p00 + p10*x + p01*y + p20*x 2 +p11*xy+p02*y 2 +p30*x 3 +p21*x 2 y+p12*xy 2 +p03*y 3 , Among them, p00 is the zero-order fitting coefficient; p10 and p01 are the first-order fitting coefficients; p20, p11, and p02 are the second-order fitting coefficients; and p30, p21, p12, and p03 are the third-order fitting coefficients.

3. The method according to claim 1, wherein The first displayed image of the calibration pattern includes a plurality of blocks along an x-axis and a y-axis, and Each of the plurality of blocks includes a light-emitting display sub-pixel and a plurality of non-light-emitting display sub-pixels.

4. The method according to claim 3, further comprising the steps of: The entire position data is generated by dividing the distance between the third-order fitting representative position data corresponding to the light-emitting display sub-pixels of two adjacent blocks among the plurality of blocks at equal intervals.

5. The method according to claim 1, further comprising the steps of: using the display device to display a third display image of the local point; generating a third photo image of the local point by capturing the third display image using the camera; and An optimal shift value is calculated by performing shifting on the third photo image.

6. The method according to claim 5, wherein: The steps to calculate the optimal shift value include the following steps: generating a second cropped image by adding a first shift value to the coordinates of the center of the local point of the third photo image and performing a second resizing of the third photo image; calculating a first overall symmetry value by performing a symmetry calculation on the local point of the second cropped image; calculating a plurality of total symmetry values ​​different from the first total symmetry value by iteratively performing the second resizing and the symmetry calculation using a plurality of shift values ​​different from the first shift value; and The first total symmetry value and a maximum value among the plurality of total symmetry values ​​are set as the optimal shift value.

7. The method according to claim 6, wherein: The local points of the second cropped image include a first cropping sub-pixel, a second cropping sub-pixel, a third cropping sub-pixel, a fourth cropping sub-pixel, a fifth cropping sub-pixel, a sixth cropping sub-pixel, a seventh cropping sub-pixel, an eighth cropping sub-pixel, and a ninth cropping sub-pixel arranged in three rows and three columns, and the step of calculating the first total symmetry value includes the following steps: Calculating a first average of the following ratios as a bilaterally symmetric value: a first ratio of the minimum brightness value of the first cropping sub-pixel and the third cropping sub-pixel to the maximum brightness value of the first cropping sub-pixel and the third cropping sub-pixel, a second ratio of the minimum brightness value of the fourth cropping sub-pixel and the sixth cropping sub-pixel to the maximum brightness value of the fourth cropping sub-pixel and the sixth cropping sub-pixel, and a third ratio of the minimum brightness value of the seventh cropping sub-pixel and the ninth cropping sub-pixel to the maximum brightness value of the seventh cropping sub-pixel and the ninth cropping sub-pixel; Calculating a second average of the following ratios as the upper and lower symmetrical value: a fourth ratio of the minimum brightness value of the first cropping sub-pixel and the seventh cropping sub-pixel to the maximum brightness value of the first cropping sub-pixel and the seventh cropping sub-pixel, a fifth ratio of the minimum brightness value of the second cropping sub-pixel and the eighth cropping sub-pixel to the maximum brightness value of the second cropping sub-pixel and the eighth cropping sub-pixel, and a sixth ratio of the minimum brightness value of the third cropping sub-pixel and the ninth cropping sub-pixel to the maximum brightness value of the third cropping sub-pixel and the ninth cropping sub-pixel; and An average value of the left-right symmetry value and the top-bottom symmetry value is calculated as the first total symmetry value.

8. The method according to claim 6, wherein: The second cropped image includes a red cropped sub-pixel, a green cropped sub-pixel, and a blue cropped sub-pixel, wherein the second resizing and the symmetry calculation are iteratively performed on the green cropping sub-pixel using the first shift value and the plurality of shift values ​​in the range of -1.0 to +1.0, and The second resizing and the symmetry calculation are iteratively performed on the blue cropping sub-pixel and the red cropping sub-pixel using the first shift value and the multiple shift values ​​in the range of −2.0 to +2.

0.

9. A method for compensating a display device, the method comprising the following steps: displaying a first display image of a calibration pattern using a display device, the display device comprising a plurality of display sub-pixels; generating a first photographic image of the calibration pattern by capturing the first display image using a camera, the camera comprising a plurality of sensor sub-pixels; generating first measured representative position data corresponding to the calibration pattern by measuring the first photographic image; using the display device to display a second display image of the local point; generating a second photo image of the local point by capturing the second display image using the camera; generating second measured representative position data by measuring the second photographic image; calculating an optimal shift value by performing a shift on the second photo image; generating shifted representative position data by adding the optimal shift value to the second measured representative position data; Using the display device to display a third display image that is displayed in full white; generating a third photo image of the all-white display by capturing the third display image using the camera; generating a first cropped image by performing resizing of the third photograph image based on the shifted representative position data; calculating a brightness compensation value by comparing the measured brightness of the first cropped image with a target brightness; as well as Compensated image data is generated by applying the brightness compensation value to the image data.

10. The method according to claim 9, further comprising the steps of: After generating the first measured representative position data, generating third-order fitting representative position data by performing a two-dimensional third-order fitting on the first measured representative position data; and The step of generating the first cropped image includes generating the first cropped image by performing resizing of the third photograph image based on the third-order fitting representative position data and the shifted representative position data.

11. The method according to claim 9, wherein: The first display image of the calibration pattern includes a white dot of a 3×3 size of display sub-pixels as a local dot in a central portion thereof, and a second photo image is generated by capturing the first display image of the white dot without displaying the second display image of the local dot.

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