CHARGE RECYCLING DRIVER OUTPUT STAGE
First Claim
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1. A circuit for driving an electrode of a display unit, the circuit comprising:
- a first amplifier, an output of the first amplifier being coupled with a first terminal of a first switch, the output of the first amplifier capable of providing a voltage in a first voltage range, the first amplifier having a high power supply input associated with a first voltage source and a low power supply input associated with a second voltage source; and
a second amplifier, an output of the second amplifier being coupled with a first terminal of a second switch, the output of the second amplifier capable of providing a voltage in a second voltage range different from the first voltage range, a second terminal of the first switch being coupled with a second terminal of the second switch, the second amplifier having a high power supply input associated with the second voltage source and a low power supply input associated with a third voltage source.
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Abstract
This disclosure provides systems, methods and apparatus for recycling charge. In one aspect, a circuit may include amplifiers with power supplies provided by a capacitor voltage divider. A storage capacitor may be configured to be coupled one at a time and in parallel with individual capacitors of the voltage divider. The storage capacitor may store charge that may be reused.
5 Citations
21 Claims
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1. A circuit for driving an electrode of a display unit, the circuit comprising:
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a first amplifier, an output of the first amplifier being coupled with a first terminal of a first switch, the output of the first amplifier capable of providing a voltage in a first voltage range, the first amplifier having a high power supply input associated with a first voltage source and a low power supply input associated with a second voltage source; and a second amplifier, an output of the second amplifier being coupled with a first terminal of a second switch, the output of the second amplifier capable of providing a voltage in a second voltage range different from the first voltage range, a second terminal of the first switch being coupled with a second terminal of the second switch, the second amplifier having a high power supply input associated with the second voltage source and a low power supply input associated with a third voltage source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for biasing an electrode of a display unit, the system comprising:
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an output stage including a plurality of amplifiers, each amplifier having a high power supply input and a low power supply input; and a charge recycling circuit including a capacitor voltage divider, the capacitor voltage divider including a plurality of capacitors coupled in series to define nodes, the nodes capable of providing voltage sources for the high power supply inputs and the low power supply inputs of the amplifiers. - View Dependent Claims (18, 19)
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20. A method for recycling charge, the method comprising:
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providing voltage sources for power supplies of a plurality of amplifiers, wherein the plurality of amplifiers includes; a first amplifier, an output of the first amplifier being coupled with a first terminal of a first switch, the output of the first amplifier capable of providing a voltage in a first voltage range, the first amplifier having a high power supply input associated with a first voltage source and a low power supply input associated with a second voltage source; and a second amplifier, an output of the second amplifier being coupled with a first terminal of a second switch, the output of the second amplifier capable of providing a voltage in a second voltage range different from the first voltage range, a second terminal of the first switch being coupled with a second terminal of the second switch, the second amplifier having a high power supply input associated with the second voltage source and a low power supply input associated with a third voltage source; sinking current to a low power supply of one of the plurality of amplifiers; and transferring excess charge on the low power supply to a storage capacitor. - View Dependent Claims (21)
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Specification