# US 10,503,335 B2 · Current-driven display panel and panel display device adapted to touch sensing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,503,335 B2 - Document ID: US10503335B2 - Status: Granted - Kind: B2 - Application number: 15/922,239 - Filed: 2018-03-15 - Published: 2018-09-27 - Granted: 2019-12-10 - Earliest claimed: 2017-03-24 - Assignees: Synaptics Incorporated - Applicants: Synaptics Incorporated - Inventors: Seiki Takahashi - Web page: https://patentgrep.com/patent/US10503335B2 ## CPC - G06F 3/0416: {Control or interface arrangements specially adapted for digitisers} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/0447: {Position sensing using the local deformation of sensor cells} - G06F 3/047: using sets of wires, e.g. crossed wires - G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices - G06F 2203/04112: Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material - G09G 2310/0264: Details of driving circuits - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - 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 A display panel includes a plurality of pixel circuits; and a sense line. The plurality of pixel circuits includes a touch sensing-adapted pixel circuit including a current-driven element, a drive transistor; a hold capacitor configured to hold a voltage corresponding to a data voltage and a sense capacitor. A capacitance of the sense capacitor varies in response to contact of an object with the current-driven display panel in a vicinity of the touch sensing-adapted pixel circuit. The drive transistor is configured to supply a current to the current-driven element in response to the data voltage and supply a sense current to the sense line in response to the capacitance of the sense capacitor. ## Claims ### Claim 1 A display panel, comprising: a sense line; and a plurality of pixel circuits comprising a touch sensing-adapted pixel circuit comprising: a hold capacitor configured to hold a voltage corresponding to a data voltage; a sense capacitor having a capacitance that varies responsive to contact of an object with the display panel in a vicinity of the touch sensing-adapted pixel circuit; a current-driven element; and a drive transistor configured to: supply a drive current to the current-driven element responsive to the data voltage; and supply a sense current to the sense line responsive to the capacitance. ### Claim 2 (depends on 1) The display panel according to claim 1, wherein the plurality of pixel circuits are arranged in a plurality of rows, wherein the display panel further comprises: a first scan line; a second scan line; and a third scan line, wherein the touch sensing-adapted pixel circuit is positioned in a first row of the plurality of rows, wherein the touch sensing-adapted pixel circuit further comprises a reset transistor, wherein the hold capacitor is connected between a hold node and the second scan line, wherein the sense capacitor is connected between the hold node and a circuit ground line, and wherein the reset transistor is configured to electrically connect the hold node to a first power line fixed to a first given potential in response to a potential on the third scan line. ### Claim 3 (depends on 2) The display panel according to claim 2, wherein the first scan line is activated when data voltages are written into the pixel circuits positioned in the first row, wherein the second scan line is activated when data voltages are written into pixel circuits positioned in a second row adjacent to the first row of the plurality of rows, data voltages being written into the pixel circuits positioned in the second row before the data voltages are written into the pixel circuits positioned in the first row, and wherein the third scan line is activated when data voltages are written into pixel circuits positioned in a third row adjacent to the second row of the plurality of rows, data voltages being written into the pixel circuits positioned in the third row before the data voltages are written into the pixel circuits positioned in the second row. ### Claim 4 (depends on 2) The display panel according to claim 2, further comprising: a first emission line; a second emission line; and a data line, wherein a gate of the drive transistor is connected to the hold node, wherein the touch sensing-adapted pixel circuit further comprises: a first select transistor configured to electrically connect the data line to a source of the drive transistor in response to a potential on the first scan line; a second select transistor configured to electrically connect a second power line fixed to a second given potential to the source of the drive transistor; a third select transistor configured to electrically connect a drain of the drive transistor to the current-driven element in response to a potential on the first emission line; and a fourth select transistor configured to electrically connect the drain of the drive transistor to the sense line in response to a potential on the second scan line. ### Claim 5 (depends on 4) The display panel according to claim 4, wherein the touch sensing-adapted pixel circuit further comprises: a threshold voltage compensation transistor configured to electrically connect the drain of the drive transistor to the gate of the drive transistor in response to the potential on the first scan line. ### Claim 6 (depends on 2) The display panel according to claim 2, further comprising: an emission line; and a data line, wherein the touch sensing-adapted pixel circuit further comprises: a threshold voltage compensation capacitor connected between the hold node and a gate of the drive transistor; a first select transistor configured to electrically connect the data line to the hold node in response to a potential on the first scan line; a second select transistor configured to electrically connect a drain of the drive transistor to the current-driven element in response to a potential on the emission line; a third select transistor configured to electrically connect the drain of the drive transistor to the sense line in response to a potential of the second scan line; and a threshold voltage compensation transistor configured to electrically connect the drain of the drive transistor to the gate of the drive transistor in response to a potential on the third scan line. ### Claim 7 (depends on 1) The display panel according to claim 1, wherein the sense capacitor comprises: a first electrode; a second electrode; and a dielectric layer disposed between the first electrode and the second electrode, wherein the sense capacitor is configured so that a distance between the first electrode and the second electrode varies depending on a pressure applied to the display panel in a vicinity of the sense capacitor, in at least a portion of the sense capacitor. ### Claim 8 (depends on 7) The display panel according to claim 7, wherein the dielectric layer is formed of organic dielectric material having elasticity. ### Claim 9 A panel display device, comprising: a display driver configured to generate a data voltage, and to receive a sense current; and a display panel comprising: a sense line; and a plurality of pixel circuits comprising a touch sensing-adapted pixel circuit comprising: a hold capacitor configured to hold a voltage corresponding to a data voltage; a sense capacitor having a capacitance that varies responsive to contact of an object with the display panel in a vicinity of the touch sensing-adapted pixel circuit; a current-driven element; and a drive transistor configured to: supply a drive current to the current-driven element responsive to the data voltage; and supply the sense current to the sense line responsive to the capacitance. ### Claim 10 (depends on 9) The panel display device according to claim 9, wherein the plurality of pixel circuits are arranged in a plurality of rows, wherein the display panel further comprises: a first scan line; a second scan line; and a third scan line, wherein the touch sensing-adapted pixel circuit is positioned in a first row of the plurality of rows, wherein the touch sensing-adapted pixel circuit further comprises a reset transistor, wherein the hold capacitor is connected between a hold node and the second scan line, wherein the sense capacitor is connected between the hold node and a circuit ground line, and wherein the reset transistor is configured to electrically connect the hold node to a first power line fixed to a first given potential in response to a potential on the third scan line. ### Claim 11 (depends on 10) The panel display device according to claim 10, wherein the first scan line is activated when data voltages are written into the pixel circuits positioned in the first row, wherein the second scan line is activated when data voltages are written into pixel circuits positioned in a second row adjacent to the first row of the plurality of rows, data voltages being written the pixel circuits positioned in the second row before the data voltages are written into the pixel circuits positioned in the first row, and wherein the third scan line is activated when data voltages are written into pixel circuits positioned in a third row adjacent to the second row of the plurality of rows, data voltages being written the pixel circuits positioned in the third row before the data voltages are written into the pixel circuits positioned in the second row. ### Claim 12 (depends on 10) The panel display device according to claim 10, further comprising: a first emission line; a second emission line; and a data line, wherein a gate of the drive transistor is connected to the hold node, wherein the touch sensing-adapted pixel circuit further comprises: a first select transistor configured to electrically connect the data line to a source of the drive transistor in response to a potential on the first scan line; a second select transistor configured to electrically connect a second power line fixed to a second given potential to the source of the drive transistor; a third select transistor configured to electrically connect a drain of the drive transistor to the current-driven element in response to a potential on the first emission line; and a fourth select transistor configured to electrically connect the drain of the drive transistor to the sense line in response to a potential on the second scan line. ### Claim 13 (depends on 12) The panel display device according to claim 12, wherein the touch sensing-adapted pixel circuit further comprises: a threshold voltage compensation transistor configured to electrically connect the drain of the drive transistor to the gate of the drive transistor in response to the potential on the first scan line. ### Claim 14 (depends on 10) The panel display device according to claim 10, further comprising: an emission line; and a data line, wherein the touch sensing-adapted pixel circuit further comprises: a threshold voltage compensation capacitor connected between the hold node and a gate of the drive transistor; a first select transistor configured to electrically connect the data line to the hold node in response to a potential on the first scan line; a second select transistor configured to electrically connect a drain of the drive transistor to the current-driven element in response to a potential on the emission line; a third select transistor configured to electrically connect the drain of the drive transistor to the sense line in response to a potential of the second scan line; and a threshold voltage compensation transistor configured to electrically connect the drain of the drive transistor to the gate of the drive transistor in response to a potential on the third scan line. ### Claim 15 (depends on 9) The panel display device, according to claim 9, wherein the sense capacitor comprises: a first electrode; a second electrode; and a dielectric layer disposed between the first electrode and the second electrode, wherein the sense capacitor is configured so that a distance between the first electrode and the second electrode varies depending on a pressure applied to the display panel in a vicinity of the sense capacitor, in at least a portion of the sense capacitor, and wherein the display driver is configured to detect the pressure applied to the display panel based on the sense current. ### Claim 16 (depends on 15) The panel display device according to claim 15, wherein the dielectric layer is formed of organic dielectric material having elasticity. ### Claim 17 A method, comprising: supplying, using a drive transistor of a pixel circuit of a display panel, a drive current to a current-driven element of the pixel circuit in responsive to a voltage held across a hold capacitor of the pixel circuit; and supplying, using the drive transistor, a sense current to a sense line responsive to a capacitance of a sense capacitor, wherein the capacitance varies responsive to contact of an object with the display panel in a vicinity of the pixel circuit. ### Claim 18 (depends on 17) The method according to claim 17, further comprising: by a reset transistor integrated in the pixel circuit of the display panel, setting a gate of the drive transistor to a given potential, wherein the hold capacitor and the sense capacitor are commonly connected to the gate of the drive transistor. ### Claim 19 (depends on 18) The method according to claim 18, further comprising: supplying a drive voltage to a source of the drive transistor while the drive transistor is in a state in which a drain and the gate of the drive transistor are electrically connected, to generate the voltage held across the hold capacitor. ### Claim 20 (depends on 17) The method according to claim 17, further comprising: by a reset transistor integrated in the pixel circuit, setting a hold node to a given potential while the drive transistor is in a state in which a drain and a gate of the drive transistor are electrically connected, wherein the sense capacitor is connected to the hold node, wherein a threshold voltage compensation capacitor is connected between the hold node and the gate of the drive transistor, and wherein the drive current and the sense current depend on a voltage held across the threshold voltage compensation.