Spatially combined waveforms for electrophoretic displays
AssigneeSiPix Imaging, Inc.
InventorsRobert A. Sprague, Craig Lin, Tin Pham, Ping-Yueh Cheng
Life of this patent
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Abstract
The present invention is directed to a driving method for compensating the response speed change of an electrophoretic display due to temperature variation, photo-degradation or aging of the display device, without a complex structure (e.g., use of sensors). This is accomplished by combining two waveforms, one of which causes the grey level to become dimmer and the other waveform causes the grey level to become brighter, as the response speed degrades.
Claims14
A driving method for a display device having a binary color system comprising a first color and a second color, which method comprises
- a) applying a first waveform to drive each pixel in a first group of pixels from its initial color state to the full first color then to a color state of a first desired level;
- and
- b) applying a second waveform to drive each pixel in a second group of pixels from its initial color state to the full second color then to a color state of a second desired level,
- wherein the numbers of the pixels in the first and second groups are determined based on speed degradation of driving from the first color state to a first intermediate color state and speed degradation of driving from the second color state to a second intermediate color state.
A driving method for a display device having a binary color system comprising a first color and a second color, which method comprises
- a) applying a first waveform to drive each pixel in a first group of pixels from its initial color state to the full first color state, then to the full second color state and finally to a color state of a first desired level;
- and
- b) applying a second waveform to drive each pixel in a second group of pixels from its initial color state to the full second color state, then to the full first color state and finally to a color state of a second desired level,
- wherein the numbers of the pixels in the first and second groups are determined based on speed degradation of driving from the first color state to a first intermediate color state and speed degradation of driving from the second color state to a second intermediate color state.
Dependencies are inferred from the claim text.