# US 12,183,268 B2 · Display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,183,268 B2 - Document ID: US12183268B2 - Status: Granted - Kind: B2 - Application number: 18/368,371 - Filed: 2023-09-14 - Published: 2024-04-25 - Granted: 2024-12-31 - Earliest claimed: 2022-10-20 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Taehun Kim; Wookyu Sang; Moonsoo Chung - Web page: https://patentgrep.com/patent/US12183268B2 ## CPC - G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED] - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2300/0852: being a dynamic memory with more than one capacitor - G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes - G09G 2310/0251: Precharge or discharge of pixel before applying new pixel voltage - G09G 2310/0267: Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - G09G 2320/0252: Improving the response speed - G09G 2320/0257: Reduction of after-image effects - H10W 90/00: Package configurations - 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) - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A display device can include a light emitting element and a pixel circuit including a driving transistor; a first capacitor connected between the driving transistor and a first node; a first transistor connected between the first capacitor and a data line to operate based on a first scan signal; a first light emission transistor connected between the first capacitor and a reference voltage line to operate based on a light emission signal; and a second light emission transistor connected between the driving transistor and a low-potential voltage line to operate based on the light emission signal. The first scan signal sequentially includes a dummy scan signal section and driving scan signal section for turning on the first transistor, and the light emission signal includes a coupling period for turning on the first and second light emission transistors between the dummy scan signal section and the driving scan signal section. ## Claims ### Claim 1 A display device, comprising: a light emitting element and a pixel circuit configured to provide a driving current to the light emitting element, wherein the pixel circuit includes: a driving transistor having a gate electrode, a source electrode, and a drain electrode; a first capacitor having a first electrode connected to the gate electrode of the driving transistor and a second electrode connected to a first node; a first transistor connected between the second electrode of the first capacitor and a data line, the first transistor being configured to operate based on a first scan signal; a first light emission transistor connected between the second electrode of the first capacitor and a reference voltage line, the first light emission transistor being configured to operate based on a light emission signal; and a second light emission transistor connected between the drain electrode of the driving transistor and a low-potential voltage line, the second light emission transistor being configured to operate based on the light emission signal, wherein the first scan signal sequentially includes a first dummy scan signal section and a first driving scan signal section having a first voltage level for turning on the first transistor, wherein a period having a signal section between a dummy period having the first dummy scan signal section and a period having the first driving scan signal section has a second voltage level different from the first voltage level, and wherein the light emission signal includes a coupling period having a dummy light emission signal section for turning on the first light emission transistor and the second light emission transistor between the dummy period the period having the first driving scan signal section and the period having the first driving scan signal section. ### Claim 2 (depends on 1) The display device of claim 1, wherein the light emission signal turns off both of the first light emission transistor and the second light emission transistor within a first time period during which the first transistor is turned on by the first dummy scan signal section and within a second time period during which the first transistor is turned on by the first driving scan signal section. ### Claim 3 (depends on 1) The display device of claim 1, wherein the light emitting element includes an anode electrode connected to a high-potential voltage line and a cathode electrode connected to the source electrode of the driving transistor. ### Claim 4 (depends on 3) The display device of claim 3, further comprising a second transistor configured to operate based on the first scan signal and connected between the anode electrode and the cathode electrode. ### Claim 5 (depends on 1) The display device of claim 1, wherein the driving transistor, the first transistor, the first light emission transistor, and the second light emission transistor are P-type transistors. ### Claim 6 (depends on 1) The display device of claim 1, wherein each of the dummy period and the period having the first driving scan signal section has a temporal length of 2 horizontal periods. ### Claim 7 (depends on 6) The display device of claim 6, wherein the pixel circuit further includes a fifth transistor configured to operate based on a second scan signal and connected between the drain electrode of the driving transistor and the reference voltage line, and wherein the second scan signal includes a second driving scan signal section having the first voltage level overlapping the first driving scan signal section. ### Claim 8 (depends on 7) The display device of claim 7, wherein the second scan signal further includes a second dummy scan signal section having the first voltage level overlapping with the first dummy scan signal section. ### Claim 9 (depends on 8) The display device of claim 8, wherein the second dummy scan signal section and the second driving scan signal section overlap with the first dummy scan signal section and the first driving scan signal section by 1 horizontal period respectively. ### Claim 10 (depends on 8) The display device of claim 8, wherein the second dummy scan signal section and the second driving scan signal section occur before the first dummy scan signal section and the first driving scan signal section, respectively. ### Claim 11 (depends on 1) The display device of claim 1, wherein the first scan signal includes two or more dummy periods, and the light emission signal includes two or more coupling periods, and wherein a signal section between the two or more dummy periods has the second voltage level. ### Claim 12 (depends on 1) The display device of claim 1, further comprising: a second capacitor disposed between an anode electrode of the light emitting element and a cathode electrode of the light emitting element; and a third capacitor disposed between the gate electrode of the driving transistor and the source electrode of the driving transistor, wherein the third capacitor is connected between the first capacitor and the second capacitor. ### Claim 13 A display device, comprising: a plurality of subpixels disposed on a substrate; a scan line and a light emission line disposed on the substrate in a first direction; scan transistors disposed on the substrate and connected with the scan line; light emission transistors disposed on the substrate and connected with the light emission line; a driving transistor disposed on a same plane as the scan transistors and the light emission transistors; and a light emitting element disposed on at least one of the scan transistors, the light emission transistors, and the driving transistor, wherein a scan signal applied to the scan line includes a dummy scan signal section for turning on two or more scan transistors among the scan transistors, wherein a light emission signal applied to the light emission line includes a dummy light emission signal section for turning on the light emission transistors, and wherein a period for applying the dummy light emission signal section is after a dummy period for applying the dummy scan signal section. ### Claim 14 (depends on 13) The display device of claim 13, further comprising a data line disposed in a direction crossing the first direction, wherein the scan transistors include a first scan transistor connected to the data line. ### Claim 15 (depends on 14) The display device of claim 14, further comprising: at least one gate driver disposed in a non-display area of the substrate between at least two adjacent subpixels among the plurality of subpixels; and a gate driver line configured to transfer a signal to the at least one gate driver. ### Claim 16 (depends on 15) The display device of claim 15, further comprising: a first pad area and a second pad area disposed on the substrate, and wherein a data pad connected with the data line and a gate pad connected with the gate driver line are disposed in the first pad area. ### Claim 17 (depends on 16) The display device of claim 16, further comprising: a high-potential voltage line connected with an anode electrode of the light emitting element; and a high-potential voltage pad connected with the high-potential voltage line, wherein the high-potential voltage pad is disposed in the first pad area. ### Claim 18 (depends on 16) The display device of claim 16, further comprising: a low-potential voltage line connected with at least one light emission transistor among the light emission transistors; and a low-potential voltage pad connected with the low-potential voltage line, wherein the low-potential voltage pad is disposed in the second pad area. ### Claim 19 (depends on 13) The display device of claim 13, wherein the scan signal includes a driving scan signal section for turning on the two or more scan transistors among the scan transistors after the dummy scan signal section and the dummy light emission signal section. ### Claim 20 (depends on 19) The display device of claim 19, wherein the dummy scan signal section and the driving scan signal section are gate low voltages. ### Claim 21 (depends on 13) The display device of claim 13, wherein the scan transistors, the light emission transistors, and the driving transistor are P-type transistors. ### Claim 22 (depends on 13) The display device of claim 13, further comprising: a reflective electrode disposed between the light emitting element and at least one of the scan transistors, the light emission transistors and the driving transistor, wherein the light emitting element overlaps with the reflective electrode. ### Claim 23 (depends on 13) The display device of claim 13, wherein the scan signal includes: a first scan signal and a second scan signal for turning on different scan transistors among the scan transistors, and wherein a second dummy scan signal section and a second driving scan signal section of the second scan signal overlap with a first dummy scan signal section and a first driving scan signal section of the first scan signal, respectively. ### Claim 24 (depends on 23) The display device of claim 23, wherein the second dummy scan signal section and the second driving scan signal section occur before the first dummy scan signal section and the first driving scan signal section, respectively. ### Claim 25 A display device, comprising: a plurality of subpixels disposed on a substrate; a scan line and a light emission line disposed on the substrate; scan transistors disposed on the substrate and connected with the scan line for receiving a scan signal; light emission transistors disposed on the substrate and connected with the light emission line for receiving a light emission signal; a driving transistor disposed on a same plane as the scan transistors and the light emission transistors; and a light emitting element disposed on at least one of the scan transistors, the light emission transistors and the driving transistor, wherein a scan signal includes a dummy period having a dummy scan signal section for turning on the scan transistors and a period having a driving scan signal section for turning on the scan transistors, wherein the light emission signal includes a coupling period having a dummy light emission signal section for turning on the light emission transistors, and wherein the coupling period is between the dummy period having the dummy scan signal section and the period having the first driving scan signal section. ### Claim 26 (depends on 25) The display device of claim 25, wherein the first scan signal includes two or more of dummy periods, and wherein the light emission signal includes two or more of coupling periods. ### Claim 27 A method of controlling a pixel circuit, the method comprising: supplying a first scan signal to a first transistor connected between a data line and a first capacitor, the first scan signal sequentially including a first dummy scan signal section and a first driving scan signal section having a first voltage level for turning on the first transistor; and supplying a light emission signal to a first light emission transistor connected between the first capacitor and a reference voltage line and to a second light emission transistor connected between a drain electrode of a driving transistor and a low-potential voltage line, wherein the first capacitor is connected between a gate electrode of a driving transistor and a first node, wherein the driving transistor is connected to a light emitting element, wherein a period having a signal section between a dummy period having the first dummy scan signal section and a period having the first driving scan signal section has a second voltage level different from the first voltage level, and wherein the light emission signal includes a coupling period having a dummy light emission signal section for turning on the first light emission transistor and the second light emission transistor between the first dummy scan signal section and the first driving scan signal section.