Hewlett-packard Development Company, L.P.

Daniel Espinosa

Omer Gila

Napoleon J Leoni

Seongsik Chang

Anthony William McLennan

Eric G Nelson

Bruce J Jackson

Asaf Anufa

Chuangyu Zhou

Brad Thomas Dransfield

Raj Kelekar

Eyal Lovton

Asael Degany

Anthony W Mclennan

An electrophotographic printer includes a charge roller in charge-transferring relation to a photoconductive imaging portion. The printer may determine an AC voltage setpoint of the charge roller.

Charge roller voltage determination

A device includes a charge roller and a control portion. The charge roller is removably insertable to be in charge-transferring relation to, and spaced apart by a first air gap from, a photoconductive imaging portion of an electrophotographic printer. The control portion is to determine a size of the first air gap based on determination of a charging threshold voltage associated with the charge roller.

Charge roller gap determination

One example of a display device includes a first layer and a second layer including a conductive material. The second layer is attached to the first layer such that a surface of the second layer facing the first layer is exposed along an edge of the second layer. The second layer supports an electronic paper display imageable by receiving charges on an imaging surface of the electronic paper display. The second layer is electrically coupled to a counter-electrode of the electronic paper display.

Display device

One example of a display device includes an electronic paper display, a counter-electrode, and a floating electrode. The electronic paper display is imageable by receiving charges on an imaging surface of the electronic paper display. The counter-electrode is opposite to the imaging surface of the electronic paper display. The floating electrode is capacitively coupled to the counter-electrode.

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Palo Alto, CA, United States of America

Daniel Espinosa