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Conducting film or electrode with improved optical and electrical performance

a technology of optical and electrical performance and conducting film, which is applied in the direction of dielectric characteristics, circuit optical details, instruments, etc., can solve problems such as degrading device performance, and achieve the effect of improving the electrical properties of the conducting film or electrode and reducing unwanted interfacial reflections

Inactive Publication Date: 2016-10-20
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is for a conducting film or electrode that includes a substrate and two transparent or semitransparent conductive layers separated by a transparent or semitransparent intervening layer. The intervening layer helps reduce unwanted interfacial reflections in a device incorporating this electrode. The conducting film or electrode has improved electrical properties relative to two electrically insulated conductive layers with the same combined conductive layer thickness.

Problems solved by technology

In a ChLC device, reflections from the electrodes can occur, and those reflections are undesirable in that they degrade device performance.

Method used

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  • Conducting film or electrode with improved optical and electrical performance
  • Conducting film or electrode with improved optical and electrical performance
  • Conducting film or electrode with improved optical and electrical performance

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[0029]Substrates with the three-layer electrode design shown in FIG. 4 were fabricated. The intervening layer consisted of an acrylate polymer deposited using the ultrabarrier process identified above, and the two conductive layers consisted of sputter deposited ITO. Three layer electrodes with different intervening layer and ITO layer thicknesses were fabricated on a roll of 0.005 inch thick PET as identified in Table 2.

TABLE 2ITO 1PolymerITO 2Designfpmfpmfpm13.8683.824.3684.334.8684.844.8664.853.8663.863.8643.874.3644.384.8644.8

[0030]The individual layer thicknesses were determined by the speed of the film in feet per minute (fpm) across the ITO and ultrabarrier film deposition sources. Faster speeds yield thinner layers. The sheet resistance of these samples was measured using a non-contact probe (Delcom) that measures the combined conductivity of both ITO layers and a surface contact 4-probe instrument that measures the conductivity of the top, exposed surface. Both measurement ...

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Abstract

A conducting film or device electrode includes a substrate and two transparent or semitransparent conductive layers separated by a transparent or semitransparent intervening layer. The intervening layer includes electrically conductive pathways between the first and second conductive layers to help reduce interfacial reflections occurring between particular layers in devices incorporating the conducting film or electrode.

Description

BACKGROUND[0001]A cholesteric liquid crystal (ChLC) material consists of a nematic liquid crystal and a chiral additive blended together to spontaneously form a helical structure with a well defined pitch. This pitch determines the wavelength of light reflected by the material and hence the color of it. The color can also be adjusted by varying the ratio of the nematic liquid crystal and chiral components. A pixel in a ChLC display can be switched between its planar reflective (colored) state and its semi-transparent focal conic state by application of an appropriate drive scheme. In a ChLC device, reflections from the electrodes can occur, and those reflections are undesirable in that they degrade device performance.SUMMARY[0002]A conducting film or electrode, consistent with the present invention, includes a substrate and two transparent or semitransparent conductive layers separated by a transparent or semitransparent intervening layer. The intervening layer, which helps reduce u...

Claims

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Application Information

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IPC IPC(8): H05K1/02H05K1/03H05K1/09H05K1/11G02F1/1335G02F1/1343
CPCH05K1/0274G02F1/133502G02F1/13439H05K1/09H05K1/115G02F2203/34G02F1/133512H05K2201/0108H05K2201/0338H05K2201/10136H05K1/032G02F1/13718G02F1/133521H05K1/053H05K1/056
Inventor NIRMAL, MANOJMAKI, STEPHEN P.RADEL, JASON C.BROTT, ROBERT L.MCCLURE, DONALD J.BRIGHT, CLARK I.
Owner 3M INNOVATIVE PROPERTIES CO