Improved electronic whiteboard using electrophoretic display

• Main Authors: GENDLER PAUL, CHUNG JERRY
• Format: Patent
• Language: Chinese; English
• Published: 03.12.2008
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

The present invention is directed to a display device which includes an array of sealed microcups containing particles of a designated electric and magnetic characteristic suspended in a solvent wherein a surface of a plurality of the sealed microcups constituting a transparent surface. The display device further includes an electromagnetic image writing/drawing pen for manually applying an electromagnetic field on the particles of the designated electric and magnetic characteristic in the microcups to form an image viewable from the transparent surface. More particularly, the particles of the designated electric and magnetic characteristic are charged particles and the writing and drawing pen is an electrical writing/drawing pen.