# US 8,542,200 B2 · Touch sensing electrophoretic display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,542,200 B2 - Document ID: US8542200B2 - Status: Granted - Kind: B2 - Application number: 12/642,410 - Filed: 2009-12-18 - Published: 2011-03-03 - Granted: 2013-09-24 - Earliest claimed: 2009-08-26 - Assignees: Samsung Display Co., Ltd. - Applicants: Sang-Myoung Lee; Tae-Hyun Hwang; Hyung-Il Jeon - Inventors: Sang-Myoung Lee; Tae-Hyun Hwang; Hyung-Il Jeon - Web page: https://patentgrep.com/patent/US8542200B2 ## CPC - G06F 3/0412: {Digitisers structurally integrated in a display} - G02F 1/167: by electrophoresis - G02F 1/1677: Structural association of cells with optical devices, e.g. reflectors or illuminating devices - G06F 3/042: by opto-electronic means - G02F 1/13312: {Circuits comprising photodetectors for purposes other than feedback} - G02F 1/16757: Microcapsules - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - 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 ## Abstract An image display device has touch sensing sensor components integrally distributed amongst pixel components of the device. In one embodiment, the distribution is one sensor component per one pixel component. In one embodiment, the pixel component forms a pixel portion of an image by selectively reflecting light and the sensor component is composed of a material that reflects light. More specifically, in one embodiment the light reflecting pixel component is an electrophoretic unit and the sensor component includes a layer of titanium having a color filter layer disposed below it and thus protectively covering it. Reflection of light from the light reflecting sensor layer is reduced by providing an anti-reflection layer above it. The sensor component changes resistance in response to change of local temperature or of an amount of infrared radiation impinging on it. Its resistance is measured by way of two wires connected thereto and extending through contact holes provided in the color filter layer. ## Claims ### Claim 1 An electrophoretic display comprising: a first light-passing substrate; a sensing layer formed under the first substrate; a sensing line electrically connected to the sensing layer; a second substrate; an electrophoretic layer disposed between the first substrate and the second substrate, a color filter encapsulating at least a lower part of the sensing layer and formed under the sensing layer, wherein the plural sensing lines include a first sensing line and a second sensing line, the at least one contact hole of the color filter includes a first contact hole and a second contact hole, the first sensing line is electrically connected to the sensing layer through the first contact hole, and the second sensing line is electrically connected to the sensing layer through the second contact hole. ### Claim 2 (depends on 1) The electrophoretic display of claim 1, wherein the sensing layer is made of a material whose electrical resistance changes when exposed to changed levels of applied infrared (IR) rays or heat. ### Claim 3 (depends on 2) The electrophoretic display of claim 2, wherein the sensing layer includes at least one of vanadium oxide, titanium, platinum, silicon germanium (SiGe), and amorphous silicon. ### Claim 4 (depends on 3) The electrophoretic display of claim 3, wherein the sensing layer is made of a double layer including titanium and titanium oxide. ### Claim 5 (depends on 3) The electrophoretic display of claim 3, wherein the sensing layer includes a reflection reducing layer disposed above the sensing layer. ### Claim 6 (depends on 5) The electrophoretic display of claim 5, wherein the reflection reducing layer includes a metal oxide or nitride. ### Claim 7 (depends on 1) The electrophoretic display of claim 1, further comprising: a thin film transistor positioned under the sensing layer, a gate line and a data line connected to the thin film transistor and formed under the sensing layer. ### Claim 8 (depends on 7) The electrophoretic display of claim 7, wherein the sensing lines include a first sensing line extending parallel to the gate line and a second sensing line extending parallel to the data line. ### Claim 9 (depends on 7) The electrophoretic display of claim 7, further comprising: a passivation layer covering the thin film transistor; and a pixel electrode formed under the passivation layer, wherein the passivation layer has a contact hole defined therethrough and wherein the pixel electrode is electrically connected to an output terminal of the thin film transistor by way of the contact hole in the passivation layer. ### Claim 10 (depends on 1) The electrophoretic display of claim 1, wherein the color filter has at least one contact hole defined there-through and exposing the sensing layer. ### Claim 11 (depends on 10) The electrophoretic display of claim 10, wherein at least one of the sensing lines is electrically connected to the sensing layer by way of a corresponding at least one of the contact holes defined through the color filter. ### Claim 12 (depends on 1) The electrophoretic display of claim 1, wherein the electrophoretic layer includes microcapsules each including electrophoretic particles. ### Claim 13 (depends on 12) The electrophoretic display of claim 12, wherein the electrophoretic particles are divided into two types of electrophoretic particles having respective charges of opposed polarities. ### Claim 14 (depends on 13) The electrophoretic display of claim 13, wherein one of the two types of electrophoretic particles includes a dark color imparting material such as carbon black, and the other includes a light color imparting material such as titanium oxide or silica. ### Claim 15 (depends on 1) The electrophoretic display of claim 1, further comprising a common electrode formed on the second substrate. ### Claim 16 An electrophoretic display comprising: a first substrate; a plurality of thin film transistors disposed on the first substrate; a plurality of color filters disposed on the first substrate; a plurality of sensor components formed between the first substrate and the plurality of thin film transistors; a second substrate opposite the first substrate; and a plurality of electrophoretic particles disposed between the first substrate and the second substrate. ### Claim 17 (depends on 16) The electrophoretic display of claim 16, wherein at least one of the sensor components functions as a light blocking member that blocks external light from becoming incident upon one or more thin film transistors. ### Claim 18 (depends on 16) The electrophoretic display of claim 16, wherein each sensor component overlaps one of semiconductor layers in the plurality of thin film transistors. ### Claim 19 (depends on 18) The electrophoretic display of claim 18, wherein the each sensor component does not overlap a contact hole for connecting a pixel electrode and a drain of the thin film transistor. ### Claim 20 (depends on 19) The electrophoretic display of claim 19, wherein the each sensor component does not overlap the pixel electrode.