# US 10,310,682 B2 · Touch display panel and fabrication method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,310,682 B2 - Document ID: US10310682B2 - Status: Granted - Kind: B2 - Application number: 15/132,202 - Filed: 2016-04-18 - Published: 2017-10-19 - Granted: 2019-06-04 - Earliest claimed: 2016-04-18 - Assignees: Novatek Microelectronics Corp. - Applicants: Novatek Microelectronics Corp. - Inventors: Yu-Tsung Lu; Ching-Chun Lin - Web page: https://patentgrep.com/patent/US10310682B2 ## CPC - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/04166: {Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184)} - G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices - G06F 2203/04105: Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A touch display panel includes a top substrate, a bottom substrate, a first pressure sensing electrode, a second pressure sensing electrode and a liquid crystal layer. The top substrate has a color filter layer. The bottom substrate is stacked under the top substrate. The first pressure sensing electrode is disposed on a first surface of the top substrate. The second pressure sensing electrode is disposed on a surface of the bottom substrate. Therein, the first pressure sensing electrode and the second pressure sensing electrode form a pressure sensing capacitor. The liquid crystal layer is disposed between the top substrate and the bottom substrate and disposed between the first pressure sensing electrode and the second pressure sensing electrode. ## Claims ### Claim 1 A touch display panel, comprising: a liquid crystal layer for displaying an image; a top substrate of the liquid crystal layer, having a color filter layer; a first pressure sensing electrode, disposed on a first surface of the top substrate of the liquid crystal layer; a bottom substrate of the liquid crystal layer, stacked under the top substrate, wherein the liquid crystal layer is disposed between the top substrate and the bottom substrate for displaying the image; and a second pressure sensing electrode, disposed on a surface of the bottom substrate of the liquid crystal layer, wherein the first pressure sensing electrode and the second pressure sensing electrode form a pressure sensing capacitor, and the same liquid crystal layer for displaying the image is disposed between the first pressure sensing electrode and the second pressure sensing electrode. ### Claim 2 (depends on 1) The touch display panel according to claim 1, wherein the color filter layer is disposed on a second surface of the top substrate, and the second surface is different from the first surface. ### Claim 3 (depends on 1) The touch display panel according to claim 1, wherein the color filter layer is disposed on the first surface of the top substrate and disposed between the first pressure sensing electrode and the top substrate. ### Claim 4 (depends on 1) The touch display panel according to claim 1, wherein the color filter layer is disposed on the first surface of the top substrate, and the first pressure sensing electrode is disposed between the color filter layer and the top substrate. ### Claim 5 (depends on 1) The touch display panel according to claim 1, wherein the second pressure sensing electrode is a common electrode of a liquid crystal capacitor of a pixel circuit of the touch display panel. ### Claim 6 (depends on 5) The touch display panel according to claim 5, wherein the second pressure sensing electrode is electrically coupled to a common voltage during a display driving period, and the second pressure sensing electrode is electrically coupled to an amplifier during a press sensing period to sense a capacitance of the pressure sensing capacitor. ### Claim 7 (depends on 1) The touch display panel according to claim 1, further comprising: a pixel circuit, disposed on the surface of the bottom substrate and configured to drive the liquid crystal layer, wherein the pixel circuit is disposed in a first conductive layer of the bottom substrate, the second pressure sensing electrode is disposed in a second conductive layer of the bottom substrate, and the first conductive layer is between the bottom substrate and the second conductive layer. ### Claim 8 (depends on 1) The touch display panel according to claim 1, further comprising: a pixel circuit, disposed on the surface of the bottom substrate and configured to drive the liquid crystal layer, wherein the second pressure sensing electrode is disposed in a first conductive layer of the bottom substrate, the pixel circuit is disposed in a second conductive layer of the bottom substrate, and the first conductive layer is between the bottom substrate and the second conductive layer. ### Claim 9 (depends on 1) The touch display panel according to claim 1, further comprising: a pixel circuit, disposed on the surface of the bottom substrate and configured to drive the liquid crystal layer, wherein the pixel circuit and the second pressure sensing electrode are disposed on a same conductive layer of the bottom substrate. ### Claim 10 (depends on 1) The touch display panel according to claim 1, wherein the touch display panel comprises a pressure sensor array, and the pressure sensing capacitor is one pressure sensor in the pressure sensor array. ### Claim 11 (depends on 1) The touch display panel according to claim 1, wherein a layout pattern of the first pressure sensing electrode or the second pressure sensing electrode is a solid geometric plane, a hollow geometric ring, a meander line, a spiral line, a net shape or a grid shape. ### Claim 12 A fabrication method of a touch display panel, comprising: providing a top substrate of a liquid crystal layer; disposing a color filter layer on the top substrate; disposing a first pressure sensing electrode on a first surface of the top substrate of the liquid crystal layer; providing a bottom substrate of the liquid crystal layer; disposing a second pressure sensing electrode on a surface of the bottom substrate of the liquid crystal layer; stacking the top substrate above the bottom substrate, wherein the first pressure sensing electrode of the top substrate and the second pressure sensing electrode of the bottom substrate form a pressure sensing capacitor; and disposing a liquid crystal layer between the top substrate and the bottom substrate for displaying an image, wherein the same liquid crystal layer for displaying the image is disposed between the first pressure sensing electrode and the second pressure sensing electrode. ### Claim 13 (depends on 12) The fabrication method of the touch display panel according to claim 12, wherein the color filter layer is disposed on a second surface of the top substrate, and the second surface is different from the first surface. ### Claim 14 (depends on 12) The fabrication method of the touch display panel according to claim 12, wherein the color filter layer is disposed on the first surface of the top substrate, and disposed between the first pressure sensing electrode and the top substrate. ### Claim 15 (depends on 12) The fabrication method of the touch display panel according to claim 12 wherein the color filter layer is disposed on the first surface of the top substrate, and the first pressure sensing electrode is disposed between the color filter layer and the top substrate. ### Claim 16 (depends on 12) The fabrication method of the touch display panel according to claim 12, wherein the second pressure sensing electrode is a common electrode of a liquid crystal capacitor of a pixel circuit of the touch display panel. ### Claim 17 (depends on 12) The fabrication method of the touch display panel according to claim 12, further comprising: disposing a pixel circuit on the surface of the bottom substrate, wherein the pixel circuit is configured to drive the liquid crystal layer, the pixel circuit is disposed in a first conductive layer of the bottom substrate, the second pressure sensing electrode is disposed in a second conductive layer of the bottom substrate, and the first conductive layer is between the bottom substrate and the second conductive layer. ### Claim 18 (depends on 12) The fabrication method of the touch display panel according to claim 12, further comprising: disposing a pixel circuit on the surface of the bottom substrate, wherein the pixel circuit is configured to drive the liquid crystal layer, the second pressure sensing electrode is disposed in a first conductive layer of the bottom substrate, the pixel circuit is disposed in a second conductive layer of the bottom substrate, and the first conductive layer is between the bottom substrate and the second conductive layer. ### Claim 19 (depends on 12) The fabrication method of the touch display panel according to claim 12, further comprising: disposing a pixel circuit on the surface of the bottom substrate, wherein the pixel circuit is configured to drive the liquid crystal layer, and the pixel circuit and the second pressure sensing electrode are disposed in a same conductive layer of the bottom substrate. ### Claim 20 (depends on 12) The fabrication method of the touch display panel according to claim 12, wherein the touch display panel comprises a pressure sensor array, and the pressure sensing capacitor is one pressure sensor in the pressure sensor array. ### Claim 21 (depends on 12) The fabrication method of the touch display panel according to claim 12, wherein a layout pattern of the first pressure sensing electrode or the second pressure sensing electrode is a solid geometric plane, a hollow geometric ring, a meander line, a spiral line, a net shape or a grid shape.