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Digital driving circuits, methods and systems for display devices

  • US 9,852,702 B2
  • Filed: 04/22/2014
  • Issued: 12/26/2017
  • Est. Priority Date: 01/14/2010
  • Status: Active Grant
First Claim
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1. A method comprising:

  • generating display driver signals that vary between only two levels and vary in pulse density, wherein the display driver signals are digital signals and comprise common driver signals and segment driver signals;

    applying, by a driver circuit, the display driver signals to opposing electrodes of a display element within a display device, wherein the driver circuit comprises an output resistance, wherein the output resistance, an intrinsic resistance, and an intrinsic capacitance of the display device form a low pass filter with respect to a modulating frequency of the display signals, wherein the low pass filter filters the display driver signals to generate different analog signal levels at the display element of the display device, wherein the modulating frequency is outside of a pass band of the low pass filter, wherein the low pass filter transforms display driver signals having a variable pulse density into variable voltage levels of a voltage across the display element;

    in a first mode, varying the pulse density of the display driver signals to select or de-select the display element based on a first average voltage magnitude of the voltage across the display element over a first time period, wherein the display element is activated in the first mode when the first average voltage magnitude exceeds a first threshold value; and

    in a second mode, varying a correlation between the common drive signals and the segment drive signals to select or de-select the display element based on a second average voltage magnitude of the voltage across the display element over a second time period, wherein the display element is activated in the second mode when the second average voltage magnitude exceeds a second threshold value.

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