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KR-20260064700-A - Electro-optical device including a barrier layer

KR20260064700AKR 20260064700 AKR20260064700 AKR 20260064700AKR-20260064700-A

Abstract

An electro-optical device is disclosed comprising an electro-optical material layer, a barrier layer adjacent to the electro-optical material layer, and an adhesive layer containing a dopant, wherein the electro-optical material layer, the barrier layer, and the adhesive layer are disposed between two electrode layers. The barrier layer prevents or reduces the diffusion of the dopant and other materials from one layer of the electro-optical device to another layer, thereby preventing degradation of the device components and enabling good electro-optical performance.

Inventors

  • 카마에브 파벨
  • 밀러 데이비드 대럴

Assignees

  • 이 잉크 코포레이션

Dates

Publication Date
20260507
Application Date
20240925
Priority Date
20230929

Claims (20)

  1. In an electro-optical device that is a type (A) or type (B) electro-optical device, The above type (A) electro-optical device is: First light-transmitting electrode layer; Light-transmitting barrier layer; Electro-optical material layer; First adhesive layer; and Second electrode layer Includes in order, The above type (B) electro-optical device is: First light-transmitting electrode layer; Electro-optical material layer; barrier layer; First adhesive layer; and Second electrode layer Includes in order, An electro-optical device wherein the electro-optical material layer comprises an electrophoretic medium, the electrophoretic medium comprises charged pigment particles in a non-polar liquid, the first adhesive layer comprises a first dopant having a first concentration, and the second electrode layer comprises a plurality of pixel electrodes.
  2. In claim 1, An electro-optical device wherein the electrophoretic medium is encapsulated in a plurality of microcapsules or a plurality of microcells, each microcell comprising a partition wall, an opening, and a sealing layer, and the sealing layer extending across the opening of each microcell.
  3. In claim 1 or claim 2, The electrophoretic medium is encapsulated in a plurality of microcapsules, and the electro-optical device further comprises a second adhesive layer, wherein the second adhesive layer is disposed between the first electrode layer and the barrier layer in the electro-optical device of type (A), or wherein the second adhesive layer is disposed between the barrier layer and the second electrode layer in the electro-optical device of type (B), and the second adhesive layer comprises a second dopant having a second concentration.
  4. In claim 3, An electro-optical device in which the first dopant is identical to or different from the second dopant.
  5. In any one of claims 1 to 4, An electro-optical device in which the first concentration of the first dopant in the first adhesive layer is 50 to 1000 ppm based on the weight of the first adhesive layer.
  6. In any one of claims 3 to 5, An electro-optical device in which the first concentration of the first dopant in the first adhesive layer is lower than the second concentration of the second dopant in the second adhesive layer.
  7. In any one of claims 3 to 6, An electro-optical device in which the second concentration of the second dopant in the second adhesive layer is 1,000 to 5,000 ppm based on the weight of the first adhesive layer.
  8. In any one of claims 1 to 7, An electro-optical device in which the first dopant is an ionic liquid.
  9. In any one of claims 3 to 8, An electro-optical device in which the second dopant is an ionic liquid.
  10. In any one of claims 1 to 9, An electro-optical device in which the first adhesive layer comprises polyurethane.
  11. In any one of claims 3 to 10, An electro-optical device in which the second adhesive layer comprises polyurethane.
  12. In any one of claims 1 to 11, An electro-optical device in which the barrier layer comprises a material selected from the group consisting of silicon dioxide, aluminum oxide, aluminum nitride, titanium nitride, titanium oxide, silicon nitride, indium tungsten oxide, metals, and mixtures thereof.
  13. In claim 12, An electro-optical device in which the metal is iron, titanium, germanium, vanadium, tungsten, silicon, silver, nickel, niobium, chromium, gold, and mixtures thereof.
  14. In claim 13, An electro-optical device having an average thickness of the barrier layer of 5 to 30 nm.
  15. In any one of claims 1 to 13, An electro-optical device having an average thickness of the barrier layer of 5 nm to 1 micrometer.
  16. In any one of claims 1 to 13, An electro-optical device having an average thickness of the barrier layer of 5 to 200 nm.
  17. In any one of claims 1 to 16, An electro-optical device in which the above barrier layer is formed through sputtering.
  18. In any one of claims 1 to 16, An electro-optical device in which the above barrier layer is formed through chemical vapor deposition.
  19. In a method for manufacturing an electro-optical assembly, Step of providing a first electrode layer having a surface - said first electrode layer comprises a light-transmitting electrode - ; A step of coating an electro-optical material slurry on the surface of the first electrode layer - the electro-optical material slurry comprises a plurality of microcapsules and a binder, wherein each of the plurality of microcapsules comprises charged particles in a non-polar liquid - ; A step of curing the binder to form an electro-optical material layer on the surface of the first electrode layer; A step of forming a barrier layer on the electro-optical material layer through chemical vapor deposition of the barrier material or through sputtering; A step of coating a first adhesive composition on the barrier layer; A step of curing the above adhesive composition and forming a first adhesive layer; and A step of attaching a first release sheet onto the first adhesive layer. A method for manufacturing an electro-optical assembly comprising
  20. In a method for manufacturing an electro-optical device, Step of providing a third type sheet A step of coating an electro-optical material slurry on the third differentiating sheet above - the slurry comprises a plurality of microcapsules and a binder, wherein each of the plurality of microcapsules comprises charged particles in a non-polar liquid - ; A step of curing the above electro-optical material slurry to form an electro-optical material layer on the third release sheet; A step of forming a barrier layer on the electro-optical material layer through chemical vapor deposition of a barrier material or through sputtering to form an electro-optical material film comprising, in order, the barrier layer, the electro-optical material layer, and the third release sheet; Step of providing a second type sheet; A step of coating a second adhesive composition on the second release sheet; A step of curing the second adhesive composition and forming a second adhesive layer; A step of attaching a fourth release sheet onto the first adhesive layer to form a second release structure comprising, in order, the fourth release sheet, the second adhesive layer, and the second release sheet; A step of removing the fourth release sheet from the second release structure and exposing the surface of the second adhesive layer of the second release structure; A step of connecting the exposed surface of the second adhesive layer to the barrier layer of the electro-optical material film to form an intermediate electro-optical structure comprising, in order, the second release sheet, the second adhesive layer, the barrier layer, the electro-optical material layer, and the third release sheet; Step of providing a first type sheet; A step of coating a first adhesive composition on the first release sheet; A step of curing the first adhesive composition to create a first adhesive layer, thereby forming a first release structure comprising the first adhesive layer and the first release sheet; A step of removing the third release sheet from the intermediate electro-optical structure to expose the surface of the electro-optical material layer; A step of forming a double release sheet by connecting the exposed surface of the electro-optical material layer to the first adhesive layer of the first release structure; Step of providing a second electrode; A step of removing the first release sheet of the double release sheet to expose the surface of the first adhesive layer; A step of forming an intermediate electro-optical web by connecting the exposed surface of the first adhesive layer to the second electrode; A step of providing a first light-transmitting electrode; A step of removing the second release sheet of the intermediate electro-optical web and exposing the surface of the second adhesive layer; and A step of connecting the exposed surface of the second adhesive layer to the first light-transmitting electrode. A method for manufacturing an electro-optical device comprising

Description

Electro-optical device including a barrier layer Related applications This application claims priority to U.S. provisional patent application No. 63/541,356 filed on September 29, 2023, the entire contents of which are incorporated by reference together with all other patents and patent applications disclosed herein. The present invention relates to an electro-optical device comprising an electro-optical material layer, a barrier layer adjacent to the electro-optical material layer, and an adhesive layer containing a dopant, wherein the electro-optical material layer, the barrier layer, and the adhesive layer are disposed between two electrode layers. The barrier layer prevents or reduces the diffusion of the dopant and other materials from one layer of the electro-optical device to another layer, and preserves good electro-optical performance of the electro-optical device. The term “electro-optic,” as applied to materials, devices, displays, or assemblies, is used herein in the customary sense in the field of imaging technology to refer to a material having first and second display states with at least one optical property that changes from its first display state to its second display state by the application of an electric field to the material. Optical properties are typically color perceptible to the human eye, but may also be other optical properties such as optical transmittance, reflectance, luminescence, or, in the case of machine-readable displays, pseudo-color in the sense of changes in reflectance of electromagnetic wavelengths outside the visible light range. The terms “electro-optical device” and “electro-optical display” are considered synonyms herein. The term “electro-optical assembly,” as used herein, may be an electro-optical device. It may also be a multilayer component used to construct an electro-optical device. Thus, for example, the front plane laminate described below is also considered an electro-optical assembly. The term “gray state” is used herein in the conventional sense in the field of imaging technology to refer to an intermediate state between the two extreme display states of a pixel, and does not necessarily imply a black-and-white transition between these two extreme states. For example, some of the E Ink patents and published applications referenced below describe electrophoretic displays in which the extreme states are white and dark blue, so that the intermediate “gray state” would actually be light blue. In fact, as previously mentioned, a change in display state may not be a change in color at all. The terms “black” and “white” may be used below to refer to the two extreme display states of a display and should generally be understood to include extreme display states that are not strictly black-and-white, e.g., the aforementioned white and dark blue states. The term “monochrome” may be used below to indicate a driving method that drives a pixel only to its two extreme display states without any intermediate gray state. Some electro-optical materials are solid in that they have a solid outer surface, but the materials may have, and often do have, internal spaces filled with liquid or gas. Displays using such solid electro-optical materials may be referred to as "solid-state electro-optical displays" for convenience below. Accordingly, the term "solid-state electro-optical display" includes rotating bichromal member displays, encapsulated electrophoretic displays, microcell electrophoretic displays, and encapsulated liquid crystal displays. The terms “bistable” and “bistable” are used herein in the customary sense in the art to refer to a display comprising a display element having first and second display states having at least one optical characteristic that is different, so that after any given element is driven, its first or second display state is assumed by an addressing pulse of a finite duration, and after the addressing pulse is terminated, said state will persist at least several times, e.g., at least four times, which is the minimum duration of the addressing pulse required to change the state of the display element. U.S. Patent No. 7,170,670 describes that some grayscale-capable particle-based electrophoretic displays are stable not only in their extreme grayscale states but also in their intermediate grayscale states, and the same is true for some other types of electro-optical displays. While it is appropriate to call this type of display “multi-stable” rather than “bistable,” for convenience, the term “bistable” may be used herein to encompass both bistable and multi-stable displays. Several types of electro-optical displays are known. One type of electro-optical display is the rotational bichromatic member type, as described, for example, in U.S. Patent Nos. 5,808,783; 5,777,782; 5,760,761; 6,054,071; 6,055,091; 6,097,531; 6,128,124; 6,137,467; and 6,147,791. This type of display is often referred to as a "rotational bichromatic ball" display, but the