Development of an Electrophoretic Image Display
Quarterly technical rept. 1 Feb-30 Apr 1981
PHILIPS LABS BRIARCLIFF MANOR NY
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The purpose of this work is to develop an X-Y addressed electrophoretic image display. A device capable of displaying 512 characters in a 5 x 7 dot matrix format was successfully operated. The display has only seven faults out of 228 column electrodes and only one fault out of 148 row electrodes. Sticking of the pigment to the control-electrode structure eventually degraded the contrast of the displayed information. Experiments with physical and chemical coatings of the control-electrode structure indicate that the sticking can be reduced. Opens in column electrodes resulting from heart- sealing the perimeter seal have been eliminated by using a room-temperature curing epoxy. Intermittent shorts which are believed to be due to dislodged redeposited material from the ion-beam milling process have been noted the effect of the milling angle on redeposition is being investigated. Design of the Phase II display having 640 columns and 384 rows is complete. The mask drawings were digitized, and the pattern-generator tapes needed to produce the photomasks were made. Photosensitive polymers are being considered as an alternate to Mylar in the Phase II display to eliminate the need for ion-beam milling of very large areas. In preliminary tests, potential wells 14 micrometer deep with slightly sloping walls were made. The alignmentexposure system for the Phase II display was received and is now in operation.
- Electrical and Electronic Equipment
- Printing and Graphic Arts