| 摘要 |
Image quality is improved when updating a display image ( 310 ) in a bi-stable electronic reading device ( 300, 400 ) such as one using an electrophoretic display, by providing both monochrome and greyscale images. When an update mode of a pixel ( 2 ) of the display changes from a monochrome to greyscale, a compensating pulse ( 805, 825, 845, 865 ) is applied. The compensating pulse represents an energy based on the energy difference between: (a) an over-reset pulse ( 815, 835, 855, 875 ) used during the greyscale update mode and (b) a standard reset pulse ( 610, 660 ) used during the monochrome update mode. Also, a monochrome update waveform ( 600, 650 ) includes a standard reset pulse ( 610, 660 ) whose duration is substantially less than a duration of an over-reset pulse ( 815, 835, 855, 875 ) used in a greyscale update waveform ( 800, 820, 840 and 860 ). The monochrome update mode is used in combination with the greyscale update mode when possible.
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