Cyclic redundancy check for electronic displays
First Claim
1. A method for preventing image retention in an electronic display having a display controller, and a processor within the display controller, the method comprising the steps of:
- defining an analysis area (AA), a time threshold (TT), and a pixel threshold (PT), and providing the AA, TT and PT to the electronic display processor;
using the electronic display processor to produce an image on an active display area of the electronic display by transmitting image pixel data to the electronic display;
moving the AA, under the command of the electronic display processor, through every location of the active display area of the electronic display;
using the electronic display processor to perform a checksum calculation of the pixel data within each location for an interval of time until reaching TT;
using the electronic display processor to compare the checksum calculation for each location across each interval of time to determine if the change in pixel data is less than PT for each location; and
performing an image retention prevention procedure by causing the display controller to modify the output of some portion of the pixels residing at any location where the change in pixel data is determined to be less than PT by transmitting data other than image data to said portion of the pixels, and cycling the pixels by subsequently retransmitting image data to the output-modified portion of the pixels and transmitting data other than image data to the remaining portion of the pixels.
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Accused Products
Abstract
A system and method for preventing image retention in an electronic display. A time threshold (TT) and a pixel threshold (PT) may be defined. The system preferably performs a checksum calculation of all pixel data within an active image area of the electronic display for an interval of time until reaching TT. The system may then compare the checksum calculation for each interval of time to determine if the change in pixel data is less than PT. Preferably, the system will perform an image retention prevention method for the active image area if the change in pixel data is less than PT. Generally, this is performed by transmitting alternate pixel data to the electronic display.
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Citations
18 Claims
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1. A method for preventing image retention in an electronic display having a display controller, and a processor within the display controller, the method comprising the steps of:
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defining an analysis area (AA), a time threshold (TT), and a pixel threshold (PT), and providing the AA, TT and PT to the electronic display processor; using the electronic display processor to produce an image on an active display area of the electronic display by transmitting image pixel data to the electronic display; moving the AA, under the command of the electronic display processor, through every location of the active display area of the electronic display; using the electronic display processor to perform a checksum calculation of the pixel data within each location for an interval of time until reaching TT; using the electronic display processor to compare the checksum calculation for each location across each interval of time to determine if the change in pixel data is less than PT for each location; and performing an image retention prevention procedure by causing the display controller to modify the output of some portion of the pixels residing at any location where the change in pixel data is determined to be less than PT by transmitting data other than image data to said portion of the pixels, and cycling the pixels by subsequently retransmitting image data to the output-modified portion of the pixels and transmitting data other than image data to the remaining portion of the pixels. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for preventing image retention in an electronic display having a display controller, and a processor within the display controller, the method comprising the steps of:
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defining a time threshold (TT) and a pixel threshold (PT), and providing the TT and PT to the electronic display processor; using the electronic display processor to produce an image on an active display area of the electronic display by transmitting image pixel data to the electronic display; using the electronic display processor to perform a checksum calculation of all pixel data within an active image area of the electronic display for an interval of time until reaching TT; using the electronic display processor to compare the checksum calculation for each interval of time to determine if the change in pixel data is less than PT; and performing an image retention prevention procedure by causing the display controller to modify the output of some portion of the pixels residing in the active image area when the change in pixel data is determined to be less than PT by transmitting data other than image data to said portion of the pixels, and cycling the pixels by subsequently retransmitting image data to the output-modified portion of the pixels and transmitting data other than image data to the remaining portion of the pixels. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An electronic display assembly comprising:
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an electronic display; a display controller in electrical connection with the electronic display; a processor within the display controller that is provided with a time threshold (TT) and a pixel threshold (PT); is configured to transmit image pixel data to the electronic display such that an image will be produced on an active image area of the electronic display; is programmed to perform a checksum calculation of all pixel data within the active image area of the electronic display for an interval of time until reaching TT; is programmed to compare the checksum calculation for each interval of time to determine if the change in pixel data is less than PT; and is configured to perform an image retention prevention procedure for the active image area when the change in pixel data is determined to be less than PT by transmitting data other than image data to a portion of the pixels within the active image area such that the output of said portion of pixels will be modified, and cycling the pixels by subsequently retransmitting image data to the output-modified portion of the pixels and transmitting data other than image data to the remaining portion of the pixels. - View Dependent Claims (17, 18)
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Specification