Voltage modulated driver circuits for electro-optic displays
First Claim
1. A method for writing a final gray scale image on a bistable electro-optic display having a plurality of pixels each of which is capable of displaying at least four gray levels, the method comprising applying a first set of waveforms to the display, thereby producing an intermediate image, and thereafter applying a second set of waveforms to the display, thereby producing the final image, wherein the first set of waveforms are chosen such that the intermediate image is a projection of the final image on to a subset of the gray levels of the display.
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Abstract
A method and system for applying addressing voltages to pixels of a display involves receiving input data. The input data includes an indication of an addressing voltage impulse to be applied to a pixel via an electrode. One or more voltage sources are selected, to provide the addressing voltage impulse. The one or more voltage sources each have a pre-selected voltage, The selected one or more voltage sources are electrically connected to an electrode to apply the addressing voltage impulse to the pixel. The invention also provides a method of driving an electro-optic display which uses an intermediate image of reduced bit depth, and a method of driving an electro-optic display which uses a limited number of differing drive voltages, with higher voltage pulses being used before lower voltage pulses.
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Citations
13 Claims
- 1. A method for writing a final gray scale image on a bistable electro-optic display having a plurality of pixels each of which is capable of displaying at least four gray levels, the method comprising applying a first set of waveforms to the display, thereby producing an intermediate image, and thereafter applying a second set of waveforms to the display, thereby producing the final image, wherein the first set of waveforms are chosen such that the intermediate image is a projection of the final image on to a subset of the gray levels of the display.
- 12. A method of driving a bistable electro-optic display having a plurality of pixels each of which is capable of displaying at least two different optical states, which method comprises applying to at least one pixel of the display a waveform comprising a first drive pulse followed by a second drive pulse, wherein the absolute value of the voltage of the second drive pulse is less than the absolute value of the voltage of the first drive pulse, and wherein there is applied to at least one pixel of the display a first drive pulse of one polarity followed by a second drive pulse of the same polarity but lower voltage.
Specification