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US 2006/0077190 A1Published application
Driving an electrophoretic display
AssigneeKoninklijke Philips Electronics N.V.
InventorsGuofu Zhou, Mark Johnson
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AssigneeKoninklijke Philips Electronics N.V.
InventorsGuofu Zhou, Mark Johnson
Estimating the term…
In a method of driving an electrophoretic display, during an image update period (IUi) wherein the pixels (18) of the display are addressed to refresh an image displayed, a chive waveform (DWi) is supplied (10,16) to an associated one of the pixels (18). The drive waveform (DWi) comprises successively a first pulse (Ri, Si) with a first voltage level (+VM, −VM) and a drive pulse (Di) with second voltage level (VDi). The drive pulse (Di) has a variable voltage level to allow obtaining a desired intermediate optical state of the pixel (18) with a high accuracy. An absolute value of the second voltage level (VDi) of the drive pulse (Di) is smaller than an absolute value of the first voltage level (+VM, −VM) of the first pulse (Ri, Si), to minimize the total image update time.
A drive circuit for driving an electrophoretic display having pixels (18), the drive circuit comprising a driver (10,16) for supplying, during an image update period (IUi) wherein the pixels (18) are addressed to refresh an image displayed, a drive waveform (DWi) to an associated one of the pixels (18), the drive waveform (DWi) comprising successively a first pulse (Ri, Si) with a first voltage level (+VM, −VM), and a drive pulse (Di) having a second voltage level (VDi) to obtain a desired intermediate optical state of the associated one of the pixels (18), an absolute value of the second voltage level (VDi) being smaller than an absolute value of the first voltage level (+VM, −VM).
A method of driving an electrophoretic display having pixels (18), the method comprising supplying (10,16), during an image update period (IUi) wherein the pixels (18) are addressed to refresh an image displayed, a drive waveform (DWi) to an associated one of the pixels (18), the drive waveform (DWi) comprising successively a first pulse (Ri, Si) with a first voltage level (+VM, −VM) and a drive pulse (Di) having a second voltage level (VDi) to obtain a desired intermediate optical state of the associated one of the pixels (18), an absolute value of the second voltage level (VDi) being smaller than an absolute value of the first voltage level (+VM, −VM).
Dependencies are inferred from the claim text.