# US 10,481,716 B2 · Touch display apparatus, display panel, and all-in-one switch device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,481,716 B2 - Document ID: US10481716B2 - Status: Granted - Kind: B2 - Application number: 15/812,304 - Filed: 2017-11-14 - Published: 2018-05-31 - Granted: 2019-11-19 - Earliest claimed: 2016-11-30 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: CheolSe Kim; Jinseong Kim; JiYeon Park - Web page: https://patentgrep.com/patent/US10481716B2 ## CPC - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/0416: {Control or interface arrangements specially adapted for digitisers} - G06F 3/042: by opto-electronic means - G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing} - G06V 40/1359: {Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop} - G06F 2203/04109: FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location - G09G 3/2092: {Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto (suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165)} - G09G 2300/08: Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract The present embodiments relate to an all-in-one switch device as well as a touch display apparatus and a display panel including such an all-in-one switch device. The all-in-one switch device includes a switching transistor electrically connected between a pixel electrode and a data line, and a sensor pattern connected between a first electrode and a second electrode of the switching transistor. One device is enough to provide both a switching function for display driving and a sensor function for sensing a touch position and/or a fingerprint, a separate touch sensor having a large size is unnecessary, and it is possible to precisely sense a touch position and/or a fingerprint without being affected by parasitic capacitance, even in a situation where a system has a structure or a circuit in which touch sensing based on capacitance is impossible. ## Claims ### Claim 1 A touch display apparatus, comprising: a display panel including: a data line and a gate line arranged therein; and a pixel electrode disposed in a pixel area defined by the data line and the gate line, wherein the pixel area includes a switching transistor and a sensor pattern arranged therein, wherein the switching transistor includes: a first electrode electrically connected to the pixel electrode, a second electrode electrically connected to the data line, a third electrode electrically connected to the gate line, and a semiconductor layer, both ends of which are in contact with the first electrode and the second electrode, respectively, wherein both ends of the sensor pattern directly electrically contact the first electrode and the second electrode, respectively, and wherein the sensor pattern completely overlaps the semiconductor layer. ### Claim 2 (depends on 1) The touch display apparatus of claim 1, wherein: the semiconductor layer includes: a first end in contact with a first end of the first electrodes, and a second end in contact with a first end of the second electrode; and the sensor pattern includes: a first end in contact with a second end of the first electrodes; and a second end in contact with a second end of the second electrode. ### Claim 3 (depends on 1) The touch display apparatus of claim 1, wherein the switching transistor has a top gate structure. ### Claim 4 (depends on 1) The touch display apparatus of claim 1, wherein the semiconductor layer includes a p-type or n-type low-temperature polycrystalline silicon. ### Claim 5 (depends on 1) The touch display apparatus of claim 1, wherein: the sensor pattern is disposed above the third electrode; and an insulation layer is disposed between the sensor pattern and the third electrode. ### Claim 6 (depends on 1) The touch display apparatus of claim 1, wherein a part of the pixel areas in the display panel does not include the third electrode under the sensor pattern. ### Claim 7 (depends on 1) The touch display apparatus of claim 1, wherein the sensor pattern includes a photosensitive material. ### Claim 8 (depends on 7) The touch display apparatus of claim 7, wherein the photosensitive material includes a photosensitive material having a changing electrical characteristic when an infrared light is irradiated thereto. ### Claim 9 (depends on 7) The touch display apparatus of claim 7, wherein the photosensitive material includes a photosensitive material having a changing electrical characteristic when a visible light is irradiated thereto. ### Claim 10 (depends on 1) The touch display apparatus of claim 1, wherein the sensor pattern includes amorphous silicon. ### Claim 11 (depends on 1) The touch display apparatus of claim 1, wherein the sensor pattern includes an n+- or p+-doped amorphous silicon. ### Claim 12 (depends on 1) The touch display apparatus of claim 1, wherein the sensor pattern includes two or more layers made of different materials. ### Claim 13 (depends on 1) The touch display apparatus of claim 1, further comprising: a light output device configured to output a light to be irradiated to the sensor pattern; and a light output control device configured to control light output timing of the light output device. ### Claim 14 (depends on 13) The touch display apparatus of claim 13, wherein, in the light output timing, the switching transistor is in a turn-off state. ### Claim 15 (depends on 13) The touch display apparatus of claim 13, further comprising a light guide member configured to guide a light output from the light output device to an area in which the sensor pattern is located. ### Claim 16 (depends on 15) The touch display apparatus of claim 15, wherein the light guide member: is disposed on a layer in which the switching transistor is disposed; and is disposed on the entire area or a partial area of the display panel. ### Claim 17 (depends on 15) The touch display apparatus of claim 15, wherein a pixel area in which the sensor pattern exists is located on a partial area or the entire area of the display panel. ### Claim 18 (depends on 1) The touch display apparatus of claim 1, further comprising: a display interval for image displaying and a touch sensing interval for touch sensing, wherein the display interval includes a timing in which a gate signal of a turn-on level voltage is supplied to the gate line, and wherein the touch sensing interval includes a timing in which light is irradiated to the sensor pattern when a gate signal of a turn-off level voltage is supplied to the gate line. ### Claim 19 (depends on 1) The touch display apparatus of claim 1, further comprising a touch sensing circuit configured to detect touch information based on a difference in leakage current flowing to the data line through the sensor pattern for each pixel area. ### Claim 20 (depends on 19) The touch display apparatus of claim 19, wherein the difference in the leakage current is generated according to whether there is a touch. ### Claim 21 (depends on 19) The touch display apparatus of claim 19, wherein the difference in the leakage current is generated according to a ridge and a valley of a fingerprint. ### Claim 22 A display panel that comprises a data line and a gate line arranged therein and a pixel defined by the data line and the gate line, the display panel including a pixel electrode, a switching transistor, and a sensor pattern arranged therein, wherein the pixel electrode is disposed in each pixel; wherein the switching transistor is electrically connected between the pixel electrode and the data line; wherein the sensor pattern is electrically connected between a first electrode and a second electrode of the switching transistor; and wherein the switching transistor includes a semiconductor layer, both ends of which directly electrically contact the first electrode and the second electrode, respectively, and wherein the switching transistor completely overlaps the sensor pattern. ### Claim 23 An all-in-one switch device, comprising: a first electrode electrically connected to a pixel electrode; a second electrode electrically connected to a data line; a third electrode electrically connected to a gate line; a semiconductor layer including a first end in contact with a first end of the first electrode and a second end in contact with a first end of the second electrode; and a sensor pattern including a first end in direct electrical contact with a second end of the first electrode and a second end in direct electrical contact with a second end of the second electrode, wherein the sensor pattern completely overlaps the semiconductor layer.