Electro-optic displays

Abstract

An electro-optic display comprises first and second substrates and a lamination adhesive layer and a layer of an electro-optic material disposed between the first and second substrates, the lamination adhesive layer having a thickness of from about 14 to about 25 μm.

Description

REFERENCE TO RELATED APPLICATIONS [0001] This application claims benefit of Provisional Applications Serial No. 60 / 481,133, filed Jul. 24, 2003 and Serial No. 60 / 481,320, filed Sep. 2, 2003. [0002] This application is also related to application Ser. No. 10 / 064,389, filed Jul. 2, 2002 (Publication No. 2003 / 0025855), which itself claims priority of Provisional Application Serial No. 60 / 304,117, filed Jul. 9, 2001.[0003] The entire contents of these copending applications, and of all other U.S. patents and published and copending applications mentioned below, are herein incorporated by reference. BACKGROUND OF INVENTION [0004] This invention relates to improvements in electro-optic displays. More specifically, in one aspect this invention relates to electro-optic media and displays in which the thickness of a lamination adhesive layer is controlled to avoid certain problems otherwise experienced in such displays. In another aspect, this invention relates to the prevention of void grow...

AI Technical Summary

Benefits of technology

[0040] This invention also provides an electro-optic display comprising: a backplane comprising at least one electrode; a layer of electro-optic material; and a lamination adhesive disposed between

Problems solved by technology

Nevertheless, problems with the long-term image quality of these displays have prevented their widespread usage.

For example, particles that make up electrophoretic displays tend to settle, resulting in inadequate service-life for these displays.

If the resistivity of the adhesive layer is too high, a substantial voltage drop will occur within the adhesive layer, requiring an increase in voltage across the electrodes.

Increasing the voltage across the electrodes in this manner is undesirable, since it increases the power consumption of the display, and may require the use of more complex and expensive control circuitry to handle the increased voltage involved.

It is also necessary that the final display be able to withstand substantial temperature changes (such as may occur, for example, when a portable computer or personal digital assistant is removed from an air-conditioned car to outdoor sun on a hot day) without inducing or aggravating the formation of voids, since it has been found that some displays, which initially appear essentially free from voids, can develop objectionable voids when exposed to such temperature changes.

Such a structure is in principle structurally unstable, as differences in thermal and moisture expansion coefficients of the polymeric film and glass substrates induce very large stress and strains in the display.

Images