E Ink Corporation

Polaroid Corporation

Dirk Hertel

Stephen J Telfer

Richard J Paolini, Jr

Benjamin Harris Paletsky

Kenneth R Crounse

Suhail Shabbir Saquib

Brian David Busch

Leif D Hille

Joseph M Jacobson

Karl Raymond Amundson

Stephen D Fantone

Sunil Krishna Sainis

Alexi Arango

David Paul Biss

An electrophoretic display apparatus includes an ambient light sensor and a frontlight system for adaptively restoring whiteness and balancing color on the display.

Electrophoretic device with ambient light sensor and adaptive whiteness restoring and color balancing frontlight

A display device () comprises a reflective display () arranged to render a first image viewable through a viewing surface and a projection means (-) arranged to render a second image viewable in reflection on the viewing surface, the reflective display () and the projection means (-) being mounted on a common frame.

Illumination systems for reflective displays

An electro-optic display is provided that may include a layer of light-transmissive conductive material, a substrate, a layer of an electro-optic medium disposed between the layer of conductive material and the substrate, a color filter array, and a light emitting layer. The electro-optic medium may include a photo-luminescent material that functions as either a down-converter or an up-converter that may be excited by the light received from the light emitting layer. The photo-luminescent material may be excited by radiation having a first wavelength transmitted by a filter within the color filter array and emit radiation having a second wavelength transmitted by the filter. The photo-luminescent material may also be excited by radiation at a wavelength within a first and second range of wavelengths transmitted by two filters within the color filter array and emit radiation at a wavelength within one of the first and second ranges.

Reflective electrophoretic displays including photo-luminescent material and color filter arrays

An energy harvesting electrophoretic display is disclosed comprising a photovoltaic cell that converts part of the incident light to electric current or voltage, wherein the electric current or voltage is used for the operation of the electrophoretic display upon the conversion or stored in a storage component to be used for the operation of the electrophoretic display.

Energy harvesting electro-optic displays

A variable transmission display comprises an electrophoretic medium having electrically charged particles dispersed in a fluid, the electrophoretic medium being capable of assuming a light-transmissive state and a substantially non-light-transmissive state; a light-transmissive first electrode disposed adjacent one side of the electrophoretic medium; light-transmissive second electrodes disposed adjacent the other side of the electrophoretic medium; and voltage means for varying the potential each of the second electrodes independently of one another.

Electrophoretic displays

A dielectrophoretic display comprises a substrate having walls defining at least one cavity, the cavity having a viewing surface and a side wall inclined to the viewing surface; a suspending fluid contained within the cavity; a plurality of at least one type of particle suspended within the suspending fluid; and means for applying to the fluid an electric field effective to cause dielectrophoretic movement of the particles to the side wall of the cavity.

A method for controlling the print density of individual heating elements of a thermal print head array determines respective energy values for each heating element in response to image pixel data to be printed, multiplies determined energy values by a respective predetermined correction factor for one or more respective heating elements for improving print density consistency between individual heating elements, and dithers adjusted energy values from the step of multiplying as a function of adjacent image pixels.

Growing community of inventors

Quincy, MA, United States of America

Dirk Hertel