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US 10,762,856 B2Granted
Current protection systems and methods for electronic device displays
AssigneeApple Inc.
InventorsManev Luthra, Joseph P. Manca, Fenghua Zheng, David S. Zalatimo
Life of this patent
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Abstract
Aspects of the subject technology relate to electronic devices with displays. A display may include an array of display pixels and control circuitry for operating the display. The control circuitry may determine, based on pixel values for a row of display pixels, that a current in common supply voltage circuitry for the display pixels will exceed a threshold, if the row of display pixels is operated using the pixel values. The control circuitry may modify the pixel values for the row of display pixels to reduce the current in the common supply voltage circuitry and/or prevent the current in the common supply voltage circuitry from exceeding the threshold.
Claims20
An electronic device with a display, the display comprising:
- an array of display pixels arranged in rows and columns;
- and
- control circuitry for the array of display pixels, the control circuitry configured to:
- illuminate each display pixel in a first row of display pixels based on a display pixel value for that display pixel;
- receive a display pixel value for each display pixel in a second row of display pixels;
- determine a difference between the display pixel value for each display pixel in the second row and the display pixel values for a corresponding display pixel in the first row;
- determine a total of determined differences for pairs of positive polarity display pixels in the first and second rows;
- determine a total of determined differences for pairs of negative polarity display pixels in the first and second rows;
- combining the total of the determined differences for the pairs of positive polarity display pixels and the total of the determined differences for the pairs of negative polarity display pixels to determine a total sum of the determined differences between the display pixel value for each display pixel in the second row and the display pixel value for a corresponding display pixel in the first row;
- compare the total sum of the determined differences to a threshold for a common voltage that is supplied to the display pixels;
- determine whether to modify the display pixel values for the second row of display pixels based on the comparison of the total sum of the determined differences to the threshold;
- and
- enabling mitigation of current for the common voltage when modifying the display pixel values for the second row of display pixels.
10 more elements
A method of operating an electronic device, the method comprising:
- determining a total of determined differences for pairs of positive polarity display pixels in first and second rows of an array of display pixels;
- determining a total of determined differences for pairs of negative polarity display pixels in the first and second rows;
- combining the total of the determined differences for the pairs of positive polarity display pixels and the total of the determined differences for the pairs of negative polarity display pixels to determine a total sum of the determined differences between the display pixel value for each display pixel in the second row and the display pixel value for a corresponding display pixel in the first row;
- determining, based on the total sum of the determined differences, that a current in common supply voltage circuitry for the display pixels in the second row will exceed a threshold for a common voltage of the common supply voltage circuitry that is supplied to the display pixels if the second row of display pixels is illuminated using the pixel values;
- and
- modifying the pixel values for the second row of display pixels to enable mitigation of current to prevent the current in the common supply voltage circuitry from exceeding the threshold for the common voltage of the common supply voltage circuitry.
3 more elements
An electronic device having a display, the display comprising:
- an array of display pixels arranged in rows and columns;
- and
- control circuitry for the array of display pixels, the control circuitry configured to:
- determine a total of determined differences for pairs of positive polarity display pixels in first and second rows of the array of display pixels;
- determine a total of determined differences for pairs of negative polarity display pixels in the first and second rows;
- combining the total of the determined differences for the pairs of positive polarity display pixels and the total of the determined differences for the pairs of negative polarity display pixels to determine a total sum of the determined differences between the display pixel value for each display pixel in the second row and the display pixel value for a corresponding display pixel in the first row;
- determine, based on the total sum of the determined differences, that a current in common supply voltage circuitry for the array of display pixels in the first row will exceed a threshold for a common voltage of the common supply voltage circuitry that is supplied to the display pixels if the first row is operated using the pixel values;
- and
- modify the pixel values for the first row to enable mitigation of current to prevent the current in the common supply voltage circuitry from exceeding the threshold for the common voltage of the common supply voltage circuitry.
6 more elements
Dependencies are inferred from the claim text.