Digital driving circuits, methods and systems for liquid crystal display devices
First Claim
Patent Images
1. A method comprising:
- generating display driver signals that vary between only two levels;
applying the display driver signals to opposing electrodes of a display element within a display device, wherein the display driver signals comprise common drive signals and segment drive signals; and
in a first mode,varying a correlation between the common drive signals and the segment drive signals to select or de-select the display element based on an average voltage magnitude across the display element over a time period, wherein the display element is activated in the first mode when the average voltage magnitude exceeds a threshold value, wherein the average voltage magnitude exceeds the threshold value when a respective one of the common drive signals and the corresponding one of the segment drive signals are correlated and the average voltage magnitude does not exceed the threshold value when the respective one of the common drive signals and the corresponding one of the segment drive signals are not correlated; and
in a second mode,varying a pulse density of the display driver signals applied to the opposing electrodes to select or de-select the display element; and
filtering the display driver signals applied to the opposing electrodes using electrical characteristics of at least a portion of the display device in the second mode to provide voltage levels at the display element to vary according to pulse density, wherein the display element is activated in the second mode when a second average voltage magnitude exceeds a second threshold value.
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Abstract
A method may include generating display driver signals that vary between only two levels and applying the display driver signals to opposing electrodes of a display segment within a display device. The method varies a correlation between the display driver signals to select or de-select the display segment based on an average voltage magnitude across the display segment over a time period. The display segment is activated when the average voltage magnitude exceeds a threshold value.
16 Citations
17 Claims
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1. A method comprising:
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generating display driver signals that vary between only two levels; applying the display driver signals to opposing electrodes of a display element within a display device, wherein the display driver signals comprise common drive signals and segment drive signals; and in a first mode, varying a correlation between the common drive signals and the segment drive signals to select or de-select the display element based on an average voltage magnitude across the display element over a time period, wherein the display element is activated in the first mode when the average voltage magnitude exceeds a threshold value, wherein the average voltage magnitude exceeds the threshold value when a respective one of the common drive signals and the corresponding one of the segment drive signals are correlated and the average voltage magnitude does not exceed the threshold value when the respective one of the common drive signals and the corresponding one of the segment drive signals are not correlated; and in a second mode, varying a pulse density of the display driver signals applied to the opposing electrodes to select or de-select the display element; and filtering the display driver signals applied to the opposing electrodes using electrical characteristics of at least a portion of the display device in the second mode to provide voltage levels at the display element to vary according to pulse density, wherein the display element is activated in the second mode when a second average voltage magnitude exceeds a second threshold value. - View Dependent Claims (2, 3, 4)
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5. A method comprising:
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generating display driver signals that vary between only two levels; applying the display driver signals to electrodes of display elements within a display device, wherein the display driver signals comprise common drive signals and segment drive signals; in a a high power mode, varying a pulse density of the display driver signals; and filtering the display driver signals using electrical characteristics of at least a portion of the display device to provide voltage levels across the display elements that vary according to pulse density, wherein the display element is activated when the average voltage magnitude across the display element over a time period exceeds a first threshold value; in a low power 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 across the display element over a second time period in the low power mode, wherein the display element is activated when the second average voltage magnitude exceeds a second threshold value, wherein the second average voltage magnitude exceeds the second threshold value when a respective one of the common drive signals and the corresponding one of the segment drive signals are correlated and the second average voltage magnitude does not exceed the second threshold value when the respective one of the common drive signals and the corresponding one of the segment drive signals are not correlated; and switching between the high power mode and the low power mode in response to a mode indication. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A system comprising:
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a plurality of programmable digital blocks to be coupled to display element of a display device, wherein the plurality of programmable digital blocks are configured into the following circuits; a first signal generator circuit that generates control signals that vary between only two levels; and a selection driver circuit coupled to the first signal generator circuit, wherein the selection driver circuit is to apply the control signals to opposing electrodes of the display element, wherein the control signals comprise common drive signals and segment drive signals, wherein the selection driver circuit comprises a first mode that varies a correlation between the common drive signals and the segment drive signals to select or de-select the display element based on an average voltage magnitude across the display element over a time period, wherein the display element is activated in the first mode when the average voltage magnitude exceeds a threshold value, wherein the average voltage magnitude exceeds the threshold value when a respective one of the common drive signals and the corresponding one of the segment drive signals are correlated and the average voltage magnitude does not exceed the threshold value when the respective one of the common drive signals and the corresponding one of the segment drive signals are not correlated, wherein the selection driver circuit comprises a second mode that varies a pulse density of the control signals applied to the opposing electrodes to select or de-select the display element and filters the control signals applied to the opposing electrodes using electrical characteristics of at least a portion of the display device to provide voltage levels at the display element to vary according to pulse density, wherein the display element is activated in the second mode when a second average voltage magnitude exceeds a second threshold value. - View Dependent Claims (14, 15, 16, 17)
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Specification