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US 2012/0281052 A1Published application
Digital marking using a bipolar imaging member
AssigneeXerox Corporation
InventorsMandakini Kanungo, Kock-Yee Law, George C. Cardoso
Life of this patent
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Abstract
Various embodiments provide materials and methods for direct digital marking, wherein a surface charge contrast can be formed by oppositely addressing adjacent charge injection pixels of a bipolar imaging member and developed with enhanced image contrast at a reduced voltage of the transistors.
Claims22
A bipolar imaging member comprising:
- a substrate;
- a plurality of charge injection pixels disposed over the substrate, wherein each pixel of the plurality of charge injection pixels is individually addressable and comprises one or more of a nano-carbon-containing material, a conjugated polymer, and a combination thereof;
- a plurality of bipolar charge transport layers (CTLs), wherein each bipolar CTL of the plurality of bipolar CTLs is disposed over one pixel of the plurality of charge injection pixels and configured to transport eithers holes or electrons provided by the underlying pixel, in response to an electrical bias, to a surface of the bipolar CTL opposing an interface of the bipolar CTL with the underlying pixel;
- and
- a plurality of thin film transistors disposed over the substrate such that each thin film transistor is connected to one or more pixels of the plurality of charge injection pixels to provide the electrical bias.
2 more elements
A digital marking method comprising:
- providing a bipolar imaging member comprising a plurality of bipolar charge transport layers (CTLs) each disposed over one pixel of a plurality of charge injection pixels;
- wherein each pixel of the plurality of charge injection pixels is individually addressable to inject both holes and electrons in response to an electrical bias;
- generating a surface charge contrast on the bipolar imaging member by oppositely biasing adjacent pixels of the plurality of charge injection pixels such that holes are injected by a first pixel of the plurality charge injection pixels and transported through a corresponding bipolar CTL to a first surface, and electrons are injected by a second pixel adjacent to the first pixel and transported through a corresponding bipolar CTL to a second surface of the bipolar imaging member;
- and
- developing a developing material on one of the first surface and the second surface of the bipolar imaging member to form a developed image.
2 more elements
A digital marking method comprising:
- providing a bipolar imaging member comprising a plurality of bipolar charge transport layers (CTLs) each disposed over one pixel of a plurality of charge injection pixels;
- wherein each pixel of the plurality of charge injection pixels is individually addressable to inject either holes or electrons in response to an electrical bias by a thin film transistor;
- generating a surface charge contrast on the bipolar imaging member by oppositely biasing adjacent pixels of the plurality of charge injection pixels such that holes are injected by a first pixel of the plurality charge injection pixels and transported through a corresponding bipolar CTL to a first surface, and electrons are injected by a second pixel adjacent to the first pixel and transported through a corresponding bipolar CTL to a second surface of the bipolar imaging member;
- providing a developing material in proximity to a development nip formed between a development subsystem and the bipolar imaging member;
- electrostatically developing the developing material on one of the first surface and the second surface of the bipolar imaging member to form a developed image;
- and
- transferring the developed image from the bipolar imaging member onto a media.
4 more elements
Dependencies are inferred from the claim text.