Changing display artifacts across frames

An apparatus comprising:

• a display screen including a plurality of lines of sub-pixels;
• and
• a scanning system that updates a plurality of consecutive image frames of the display screen, each image frame being updated by scanning the plurality of lines of sub-pixels in a selected one of a plurality of different scanning orders, wherein updating the plurality of consecutive image frames includes periodically changing the selection of scanning order, wherein each scanning order of the plurality of scanning orders comprises a plurality of adjacent blocks of lines, and wherein each block in a first image frame of the plurality of consecutive image frames is shifted in a first direction by a predetermined number of lines to a corresponding block in a second image frame of the plurality of consecutive image frames, and each block in the second image frame of the plurality of consecutive image frames is shifted in the first direction by the predetermined number of lines to a corresponding block in a third image frame of the plurality of consecutive image frames.

A non-transitory computer-readable storage medium storing computer-readable instructions that, when executed by a computing device, cause the device to perform a method of displaying an image on a display screen, the display screen including a plurality of lines of sub-pixels, the method comprising:

• updating a plurality of consecutive image frames of the display screen, each image frame being updated by scanning the plurality of lines of sub-pixels in a selected one of a plurality of different scanning orders, wherein updating the plurality of consecutive image frames includes periodically changing the selection of scanning order, wherein each scanning order of the plurality of scanning orders comprises a plurality of adjacent blocks of lines, and wherein each block of a first scanning order associated with a first image frame is shifted in a first direction by a predetermined number of lines to a corresponding block of a second scanning order associated with a second image frame, and wherein each block of the second scanning order associated with the second image frame is shifted in the first direction by the predetermined number of lines to a corresponding block of a third scanning order associated with a third image frame.