Methods and devices for voltage reduction for active matrix displays using variability of pixel device capacitance
First Claim
Patent Images
1. An apparatus comprising:
- at least one display element having a plurality of display states, each of the display states corresponding to one of a plurality of charge levels applied to the at least one display element, the plurality of display states including a least a first higher capacitance display state and a second display state, wherein the capacitance of the display element is higher in the first higher capacitance display state than in the second display state;
a drive switch coupling the at least one display element to a drive voltage line when addressed by a drive address line; and
a reset switch coupling the at least one display element to a reset voltage line when addressed by a reset address line;
wherein the reset voltage line is configured to set the at least one display element to the first higher capacitance display state when coupled to the at least one display element.
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Abstract
Methods and devices for reducing the voltage required to update an array of display elements having variable capacitance are described herein. In one implementation, the method includes driving a display element to a first state using a reset drive line. The method further includes driving the display element to a second state using a column drive line. The capacitance of the display element is higher in the first state than in the second state.
37 Citations
32 Claims
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1. An apparatus comprising:
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at least one display element having a plurality of display states, each of the display states corresponding to one of a plurality of charge levels applied to the at least one display element, the plurality of display states including a least a first higher capacitance display state and a second display state, wherein the capacitance of the display element is higher in the first higher capacitance display state than in the second display state; a drive switch coupling the at least one display element to a drive voltage line when addressed by a drive address line; and a reset switch coupling the at least one display element to a reset voltage line when addressed by a reset address line; wherein the reset voltage line is configured to set the at least one display element to the first higher capacitance display state when coupled to the at least one display element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of updating an array including at least one display element, the method comprising:
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coupling the at least one display element to a reset voltage line, the at least one display element having at least a first and a second display state, wherein the capacitance of the at least one display element is higher in the first higher capacitance display state than in the second display state; setting the at least one display element to the first higher capacitance display state; decoupling the at least one display element from the reset voltage line; coupling the at least one display element to a drive voltage line; and driving the at least one display element to the second display state. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method of updating an array including at least one row of display elements, the method comprising:
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pre-charging at least one row of display elements with a reset voltage, the display elements of the at least one row having at least a first and a second display state, wherein the capacitance of the display elements of the at least one row is higher in the first higher capacitance display state than in the second display state; waiting for at least some of the display elements in the at least one row of display elements to reach the first higher capacitance display state; charging the at least one row of display elements with a drive voltage; and waiting for at least some of the display elements in the at least one row of display elements to reach the second display state. - View Dependent Claims (17, 18)
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19. An apparatus comprising:
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at least one display element having a plurality of display states, each of the display states corresponding to one of a plurality of charge levels applied to the at least one display element, the plurality of display states including a least a first higher capacitance display state and a second display state, wherein the capacitance of the display element is higher in the first higher capacitance display state than in the second display state; means for coupling the at least one display element to a drive voltage line when addressed by a drive address line; means for coupling the at least one display element to a reset voltage line; and means for setting the at least one display element to the first higher capacitance display state. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification