Printable electronic display

• US 6,480,182 B2
• Filed: 07/20/2001
• Issued: 11/12/2002
• Est. Priority Date: 03/18/1997
• Status: Expired due to Term

• Current Assignee: Massachusetts Institute of Technology
• Original Assignee: Massachusetts Institute of Technology
• Inventors: Jacobson, Joseph M., Turner, Christopher, Comiskey, Barrett
• Primary Examiner(s): Shalwala, Bipin
• Assistant Examiner(s): LEWIS, DAVID LEE
• Application Number:
  US09/910,577
• Publication Number:
  US 20010045934A1
• Time in Patent Office: 480 Days
• Field of Search: 345/107, 345/84, 345/96, 345/205, 359/43, 359/60, 359/296, 349/86, 349/89, 349/90, 349/41
• US Class Current: 345/107
• CPC Class Codes: G02F 1/1365 in which the switching element is a two-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 1/16757 Microcapsules
• CPC Class Codes: G02F 1/16766 for active matrices
• CPC Class Codes: G02F 1/1679 Gaskets; Spacers; Sealing of cells; Filling or closing of cells
• CPC Class Codes: G02F 1/172 based on a suspension of orientable dipolar particles, e.g. suspended particles displays

Abstract

A display system includes a substrate upon which the display system is fabricated; a printable electrooptic display material, such as a microencapsulated electrophoretic suspension; electrodes (typically based on a transparent, conductive ink) arranged in an intersecting pattern to allow specific elements or regions of the display material to be addressed; insulating layers, as necessary, deposited by printing; and an array of nonlinear elements that facilitate matrix addressing. The nonlinear devices may include printed, particulate Schottky diodes, particulate PN diodes, particulate varistor material, silicon films formed by chemical reduction, or polymer semiconductor films. All elements of the display system may be deposited using a printing process.

Claims

1. A method of fabricating an electronic display, the method comprising the steps of:

a. print-depositing a first set of electrodes onto a substrate;

b. print-depositing a plurality of nonlinear elements above at least some of the electrodes, the nonlinear elements having a voltage threshold;

c. print-depositing a particle-based nonemissive display material over the nonlinear elements; and

d. print-depositing a second set of electrodes over the display material and in an intersecting pattern with respect to the first set of electrodes, thereby sandwiching the display and the nonlinear elements between electrodes at regions of intersection,

the sandwiched display material and the nonlinear elements electrically coupling at least some electrodes of the first set with corresponding electrodes of the second set at regions of intersection such that a voltage exceeding the threshold and applied across the electrodes will cause current to flow between the electrodes, thereby activating the display.

2. The method of claim 1 wherein the nonemissive display is an electrophoretic display.

3. The method of claim 1 wherein the nonemissive display is a rotating-ball display.

4. The method of claim 1 wherein the nonemissive display is an electrostatic display.

5. The method of claim 2 wherein the electrophoretic display comprises:

a. an arrangement of discrete microscopic containers, each container being no longer than 500 μ

m along any dimension thereof; and

b. within each container, a dielectric fluid and a suspension therein of particles exhibiting surface charges, the fluid and the particles contrasting visually, the particles migrating toward one of the sets of electrodes in response to a potential difference therebetween.