# US 7,465,208 B2 · Method for manufacturing display element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,465,208 B2 - Document ID: US7465208B2 - Status: Granted - Kind: B2 - Application number: 10/382,832 - Filed: 2003-03-07 - Published: 2004-03-25 - Granted: 2008-12-16 - Earliest claimed: 2002-09-20 - Assignees: Fuji Xerox Co., Ltd. - Inventors: Naoki Hiji; Shigeru Yamamoto - Web page: https://patentgrep.com/patent/US7465208B2 ## CPC - G02F 1/135: Liquid crystal cells structurally associated with a photoconducting or a ferro-electric layer, the properties of which can be optically or electrically varied {(G02F1/133348 takes precedence)} - G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)} - G09F 9/35: being liquid crystals (G09F9/302 takes precedence; liquid crystal materials C09K19/00; {liquid crystal panels comprising a number of electrodes in a single cell per se G02F1/13}) - G02F 1/1334: based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS ## Abstract A dispersion liquid including micro-capsules containing a cholesteric liquid crystal as a core material dispersed into a binder resin solution is applied to and dried on a substrate formed an electrode thereon to form a display layer. Then, a light shielding layer is formed and an adhesive layer is formed thereon. On the other hand, a photoconductive layer is formed on another substrate formed another electrode thereon. The substrate formed each layer thereon and the another substrate are bonded to form a display element. The light shielding layer 14 improves roughness on a surface of the display layer and the adhesive layer filled up the roughness. Even if the bubbles occur on a back face of the light shielding layer, the bubbles does not affect the display quality. Because the bubbles are unseen. ## Claims ### Claim 1 A method for manufacturing a display element comprising: forming a display layer in which a display material is dispersed in a binder, on a first substrate; forming at least one first display function layer on the display layer after the forming of the display layer; forming at least one second display function layer on a second substrate; and bonding the first substrate on which the display layer and the at least one first display function layer has been formed to the second substrate, on which the at least one second display function layer has been formed, with an adhesive layer that substantially fills a void between layers formed on the first substrate and the second substrate; wherein the first substrate and the second substrate each has at least one electrode, wherein the second display function layer includes a switching layer and a photoconductive layer, and wherein the first display function layer comprises a light shielding layer having a black color. ### Claim 2 (depends on 1) The method according to claim 1, wherein the display element includes: the first substrate; the second substrate disposed to be opposite to the first substrate; and the first display function layer and the display layer that implement a display function and are disposed between the first substrate and the second substrate. ### Claim 3 (depends on 1) The method according to claim 1, wherein the first display function layer is a different kind of layer from the second function layer. ### Claim 4 (depends on 1) The method according to claim 1, wherein the first display function layer includes a light shielding layer. ### Claim 5 (depends on 4) The method according to claim 4, wherein the forming of the first display function layer comprises applying an aqueous coating agent to the display layer formed on the first substrate, to form the light shielding layer. ### Claim 6 (depends on 1) The method according to claim 1, wherein the display layer is a layer in which a micro-capsule containing the display material is dispersed into the binder. ### Claim 7 (depends on 6) The method according to claim 6, wherein the display material is a cholestric liquid crystal. ### Claim 8 (depends on 1) The method according to claim 1, wherein the bonding comprises forming an adhesive layer by using an adhesive agent. ### Claim 9 (depends on 1) The method according to claim 1, wherein the forming of the first display function layer comprises applying a coating agent to the display layer. ### Claim 10 (depends on 1) The method according to claim 1, wherein the light shielding layer comprises at least one of a black coating agent, a resin colored with black dye, and an evaporated film of a black material. ### Claim 11 A method for manufacturing a display element comprising: forming a first electrode on a first substrate; forming a display layer in which a display material is dispersed in a binder, on the first electrode; forming at least one first display function layer on the display layer after the forming of the display layer; forming a second electrode on a second substrate; and bonding the first substrate, on which the first electrode, the display layer, and the at least one first display function layer have been formed, with a second substrate on which the second electrode has been formed with an adhesive layer that substantially fills a void between layers formed on the first substrate and the second substrate, wherein: the first display function layer comprises a light shielding layer having a black color, and the light shielding layer comprises at least one of a black coating agent, a resin colored with black dye and an evaporated film of a black material. ### Claim 12 A method for manufacturing a display element, comprising: providing a first substrate and a second substrate; forming a display layer in which a display material is dispersed in a binder, on the first substrate; forming a light shielding layer having a black color to coat a surface of the display layer after forming the display layer such that a void between the display layer and the light shielding layer to be formed is substantially filled; bonding the second substrate and the first substrate on which the display layer and the light shielding layer are formed, such that the display layer and the light shielding layer are disposed between the first substrate and the second substrate; and forming a photoconductive layer between the light shielding layer and the second substrate, wherein the first substrate and the second substrate each have at least one electrode to apply a voltage to the display layer. ### Claim 13 (depends on 12) The method according to claim 12, wherein forming the display layer comprises: applying the display layer on the first substrate; and drying the display layer after applying the display layer on the first substrate. ### Claim 14 (depends on 12) The method according to claim 12, wherein the light shielding layer has a property which shields substantially an entire visible wavelength ranging from 400 to 700 nm. ### Claim 15 (depends on 12) The method according to claim 12, wherein the display material comprises a micro-capsule including a cholesteric liquid crystal, and the binder comprises a resin solution. ### Claim 16 A method for manufacturing a display element, comprising: providing a first substrate and a second substrate; forming a display layer in which a display material is dispersed in a binder, on the first substrate; forming a light shielding layer having a black color by directly coating the surface of the display layer with a light shielding material having a black color after forming the display layer such that a void between the display layer and the light shielding layer to be formed is substantially filled; and bonding the second substrate and the first substrate on which the display layer and the light shielding layer are formed, such that the display layer and the light shielding layer are disposed between the first substrate and the second substrate, wherein the surface of the display layer with the light shielding material is disposed on the opposite face of the display layer, where the first substrate is disposed. ### Claim 17 (depends on 16) The method according to claim 16, wherein the light shielding material includes the aqueous coating agent having at least 50% or more of water in a solvent composition. ### Claim 18 (depends on 16) The method according to claim 16, wherein the display material comprises a micro-capsule including a cholesteric liquid crystal, and the binder comprises a resin solution. ### Claim 19 (depends on 16) The method according to claim 16, wherein the light shielding layer has a property which shields substantially an entire visible wavelength ranging from 400 to 700 nm. ### Claim 20 (depends on 16) The method according to claim 16, wherein forming the display layer comprises: applying the display layer on the first substrate; and drying the display layer after applying the display layer on the first substrate. ### Claim 21 A method for manufacturing a display element, comprising: providing a first substrate and a second substrate; applying a display layer in which a display material is dispersed in a binder, on the first substrate; drying the display layer after applying the display layer on the first substrate; forming a light shielding layer having a black color on the display layer after drying the display layer; bonding the second substrate and the first substrate on which the display layer and the light shielding layer are formed, such that the display layer and the light shielding layer are disposed between the first substrate and the second substrate; and forming a photoconductive layer between the light shielding layer and the second substrate. ### Claim 22 (depends on 21) The method according to claim 21, wherein the first substrate and the second substrate each has at least one electrode to apply a voltage to the display layer. ### Claim 23 A method for manufacturing a display element, comprising: providing a first substrate and a second substrate; applying a display layer in which a display material is dispersed in a binder, on the first substrate; drying the display layer after applying the display layer on the first substrate; forming a light shielding layer having a black color on the display layer after drying the display layer by directly coating a surface of the display layer by using a light shielding material having a black color such that a void between the display layer and the light shielding layer to be formed is substantially filled; and bonding the second substrate and the first substrate on which the display layer and the light shielding layer are formed, such that the display layer and the light shielding layer are disposed between the first substrate and the second substrate. ### Claim 24 (depends on 23) The method according to claim 23, wherein the first substrate and the second substrate each have at least one electrode to apply a voltage to the display layer.