Electro-optic displays, and methods for driving same
There are provided methods for driving an electro-optic display having a plurality of display pixels, a such method includes applying a first waveform chosen from a first set of waveforms for black-to-white and white-to-white transitions if a pixel is determined to display color, and applying a second waveform chosen from a second set of waveforms for black-to-white and white-to-white transitions if a pixel is determined to display a grayscale image.
1. A method for driving an electro-optic display having a plurality of display pixels, the method comprising:
applying a first waveform chosen from a first set of waveforms for black-to-white and white-to-white transitions if a pixel is determined to display color; and
applying a second waveform chosen from a second set of waveforms for black-to-white and white-to-white transitions if the pixel is determined to display grayscale,
wherein the first set of waveforms includes a black-to-white transition waveform comprising a pre-pulse, a mid-pulse, and a set pulse and configured to reduce a differential blooming effect for pixels displaying color, and
wherein the black-to-white transition waveform from the first set of waveforms is longer in duration than a black-to-white transition waveform from the second set of waveforms.
2. The method of claim 1 further comprising applying a third waveform chosen from a third set of waveforms for black-to-white and white-to-white transitions if the pixel is determined to display black text on a white back ground.
3. The method of claim 2 wherein the third set of waveforms are configured for a third driving mode.
4. The method of claim 3 wherein the third driving mode is configured for displaying black text on a white black ground on the display.
5. The method of claim 1 further comprising applying a fourth waveform chosen from a fourth set of waveforms for black-to-white and white-to-white transitions if an algorithm is needed to perform an edge artifact clearing on the pixel.
6. The method of claim 1 wherein the first set of waveforms are configured for a first driving mode.
7. The method of claim 6 wherein the first driving mode is configured for displaying color on the display.
8. The method of claim 1 wherein the second set of waveforms are configured for a second driving mode.
9. The method of claim 8 wherein the second driving mode is configured for displaying grayscale images on the display.
10. An electro-optic display configured to carry out the method of claim 1 further comprising a color filter array.
11. The display according to claim 10 comprising rotating bichromal member, electrochromic or electro-wetting material.
12. The electro-optic display according to claim 10 comprising an electrophoretic material comprising a plurality of electrically charged particles disposed in a fluid and capable of moving through the fluid under the influence of an electric field.
13. The electro-optic display according to claim 10 wherein the electrically charged particles and the fluid are confined within a plurality of capsules or microcells.
14. The electro-optic display according to claim 10 wherein the electrically charged particles and the fluid are present as a plurality of discrete droplets surrounded by a continuous phase comprising a polymeric material.
15. The method of claim 1 wherein a voltage of the mid-pulse has a different polarity than a voltage of the pre-pulse and a voltage of the set pulse.
16. The method of claim 1 wherein a white-to-white transition waveform from the first set of waveforms has the same duration as a black-to-white transition waveform from the second set of waveforms.
17. A display controller capable of controlling the operation of a bistable electro-optic display, the controller configured to carry out a driving method for operating the display, the method comprises:
applying a first waveform chosen from a first set of waveforms for black-to-white and white-to-white transitions if a pixel is determined to display color; and
applying a second waveform chosen from a second set of waveforms for black-to-white and white-to-white transitions if the pixel is determined to display grayscale,
wherein the first set of waveforms includes a black-to-white transition waveform comprising a pre-pulse, a mid-pulse, and a set pulse and configured to reduce a differential blooming effect for pixels displaying color, and
wherein the black-to-white transition waveform from the first set of waveforms is longer in duration than a black-to-white transition waveform from the second set of waveforms.
18. The controller according to claim 17 , wherein the driving method further comprising applying a third waveform chosen from a third set of waveforms for black-to-white and white-to-white transitions if the pixel is determined to display black text on a white back ground.
19. The controller according to claim 17 , wherein the driving method further comprising applying a fourth waveform chosen from a fourth set of waveforms for black-to-white and white-to-white transitions if an algorithm is needed to perform an edge artifact clearing on the pixel.
20. The controller according to claim 17 , wherein a voltage of the mid-pulse has a different polarity than a voltage of the pre-pulse and a voltage of the set pulse.