Loading patent…
AssigneeE Ink Corporation
InventorsKarl Raymond Amundson, Matthew J. Aprea, Kenneth R. Crounse, Demetrious Mark Harrington, Jason Lin, Theodore A. Sjodin, Chia-Chen Su
Estimating the term…
A variety of methods for driving electro-optic displays so as to reduce visible artifacts are described. Such methods include (a) applying a first drive scheme to a non-zero minor proportion of the pixels of the display and a second drive scheme to the remaining pixels, the pixels using the first drive scheme being changed at each transition; (b) using two different drive schemes on different groups of pixels so that pixels in differing groups undergoing the same transition will not experience the same waveform; (c) applying either a balanced pulse pair or a top-off pulse to a pixel undergoing a white-to-white transition and lying adjacent a pixel undergoing a visible transition; (d) driving extra pixels where the boundary between a driven and undriven area would otherwise fall along a straight line; and (e) driving a display with both DC balanced and DC imbalanced drive schemes, maintaining an impulse bank value for the DC imbalance and modifying transitions to reduce the impulse bank value.
A method of driving an electro-optic display having a plurality of pixels each of which can be driven using either a first or a second drive scheme, wherein the first drive scheme is a global complete drive scheme, in which a drive voltage is applied to every pixel, is effected by dividing the pixels of the display into at least two groups, and a different drive scheme is used for each group, the drive schemes differing from each other such that, for at least one transition, pixels in differing groups with the same transition between optical states will not experience the same waveform.
A method of driving an electro-optic display having a plurality of pixels wherein, in a pixel undergoing a white-to-white transition and lying adjacent at least one other pixel undergoing a readily visible transition, there is applied to the pixel one or more balanced pulse pairs, wherein each balanced pulse pair comprises a pair of drive pulses of opposing polarities such that the net impulse of the balanced pulse pair is substantially zero.
A method of driving an electro-optic display having a plurality of pixels wherein, in a pixel undergoing a white-to-white transition and lying adjacent at least one other pixel undergoing a readily visible transition, there is applied to the pixel at least one top-off pulse having a polarity which drives the pixel towards its white state.
A method of driving an electro-optic display having a plurality of pixels, wherein, when a plurality of pixels lying in a first area of the display are driven so as to change their optical state, and a plurality of pixels lying in a second area of the display are not required to change their optical state, the first and second areas being contiguous along a straight line, a two-stage drive scheme is used wherein, in the first stage, a number of pixels lying within the second area and adjacent said straight line in fact driven to the same color as the pixels in the first area adjacent the straight line, while in the second stage, both the pixels in the first area, and said number of pixels in the second area are driven to their final optical states.
A method of driving an electro-optic display using a DC balanced drive scheme and at least one DC imbalanced drive scheme, the method comprising:
Dependencies are inferred from the claim text.