# US 12,118,941 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 12,118,941 B2 - Document ID: US12118941B2 - Status: Granted - Kind: B2 - Application number: 18/350,688 - Filed: 2023-07-11 - Published: 2023-11-02 - Granted: 2024-10-15 - Earliest claimed: 2020-12-21 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Jaeyong You - Web page: https://patentgrep.com/patent/US12118941B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3266: Details of drivers for scan electrodes - G09G 3/3291: in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements - 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 2310/0262: The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes - G09G 2310/061: for resetting or blanking - G09G 2310/067: Special waveforms for scanning, where no circuit details of the gate driver are given - G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD - 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 device includes a display panel on which gate lines, data lines and subpixels are disposed; a gate driving circuit which drives the gate lines; and a data driving circuit which drives the data lines. Each of the subpixels includes: a light emitting device; a second transistor which has a first node, a second node that is a gate node, and a third node electrically connected to the light emitting device, and drives the light emitting device; a first transistor electrically connected between the third node and the data line; a third transistor electrically connected between the first node and the second node; and a fourth transistor electrically connected between the third node and the light emitting device. The third transistor performs a turn-off operation later than the first transistor, so that a voltage applied to the third node is transmitted to the second node via the first node. ## Claims ### Claim 1 A display device, comprising: a display panel on which a plurality of gate lines, a plurality of data lines and a plurality of subpixels are disposed; and a gate driving circuit that, in operation, outputs gate signals and light emission signals to the plurality of gate lines; wherein each of the plurality of subpixels includes: a light emitting device; a driving transistor that is an N-type transistor and, in operation, drives the light emitting device; and at least one switching transistor including an oxide semiconductor material; wherein the gate signals include a first scan signal and a second scan signal; wherein the light emission signals include a first light emission signal and a second light emission signal; and wherein the first scan signal, the second scan signal, the first light emission signal and the second light emission signal are respectively applied to different gate lines of the plurality of gate lines; wherein the display panel is driven in a frame including a refresh period and a holding period in accordance with a synchronization signal, and wherein: the refresh period includes an initialization period, a sampling period, an additional sampling period, a programming period and a light emission period; and the holding period includes the light emission period. ### Claim 2 (depends on 1) The display device of claim 1, wherein the first scan signal and the second scan signal have different turn-on times. ### Claim 3 (depends on 1) The display device of claim 1, wherein the first scan signal and the second scan signal have different pulse widths. ### Claim 4 (depends on 3) The display device of claim 3, wherein the at least one switching transistor includes: a first transistor electrically connected between one electrode of the driving transistor and a data line, and that, in operation, receives the second scan signal through a first gate electrode; and a third transistor electrically connected between another electrode of the driving transistor and a gate electrode of the driving transistor, and that, in operation, receives the first scan signal through a third gate electrode. ### Claim 5 (depends on 4) The display device of claim 4, wherein the pulse width of the first scan signal is shorter than the pulse width of the second scan signal. ### Claim 6 (depends on 4) The display device of claim 4, wherein: during the holding period, the first light emission signal and the second light emission signal have different waveforms. ### Claim 7 (depends on 6) The display device of claim 6, wherein the first light emission signal has a different waveform in the refresh period and the holding period. ### Claim 8 (depends on 7) The display device of claim 7, wherein, during the holding period, the first light emission signal is a turn on level. ### Claim 9 (depends on 6) The display device of claim 6, wherein the second light emission signal has the same waveform in the refresh period and the holding period. ### Claim 10 (depends on 1) The display device of claim 1, wherein, in operation, each of the plurality of subpixels receives an initialization voltage through an initialization voltage line during the initialization period. ### Claim 11 (depends on 10) The display device of claim 10, wherein each of the plurality of subpixels further includes: a fourth transistor electrically connected between the driving transistor and the light emitting device, and that, in operation, receives the first light emission signal through a fourth gate electrode; a fifth transistor electrically connected between the driving transistor and a driving voltage line, and that, in operation, receives the second light emission signal through a fifth gate electrode; and a sixth transistor electrically connected between the gate electrode of the driving transistor, the light emitting device and the initialization voltage line, and receiving a first gate signal through a sixth gate electrode. ### Claim 12 (depends on 11) The display device of claim 11, wherein in operation: the first transistor performs a turn-on operation during the sampling period; the third transistor performs a turn-on operation during the initialization period, the sampling period and the additional sampling period; the fourth transistor performs a turn-off operation during the initialization period, the sampling period and the additional sampling period; and the fifth transistor performs a turn-off operation during the sampling period and the additional sampling period. ### Claim 13 (depends on 11) The display device of claim 11, wherein each of the plurality of subpixels further comprises a compensation capacitor connected to the one electrode of the driving transistor. ### Claim 14 (depends on 13) The display device of claim 13, wherein the compensation capacitor is further connected to the driving voltage line and, in operation, receives a high potential power supply voltage or to the initialization voltage line and, in operation, receives the initialization voltage. ### Claim 15 A display device, comprising: a display panel on which a plurality of gate lines, a plurality of data lines and a plurality of subpixels are disposed; and a gate driving circuit that, in operation, outputs gate signals and light emission signals to the plurality of gate lines; wherein each of the plurality of subpixels include: a light emitting device; a driving transistor that, in operation, drives the light emitting device; and at least one switching transistor including an oxide semiconductor material; wherein all of the driving transistor and the at least one switching transistor are N-type transistors; wherein the display panel is driven in a frame including a refresh period and a holding period in accordance with a synchronization signal; and wherein: the refresh period includes an initialization period, a sampling period, an additional sampling period, a programming period and a light emission period; and the holding period includes the light emission period. ### Claim 16 (depends on 15) The display device of claim 15, wherein: the gate signals include a first scan signal and a second scan signal; the light emission signals include a first light emission signal and a second light emission signal; and the first scan signal, the second scan signal, the first light emission signal and the second light emission signal are respectively applied to different gate lines of the plurality of gate lines. ### Claim 17 (depends on 16) The display device of claim 16, wherein the first scan signal and the second scan signal have different pulse widths. ### Claim 18 (depends on 17) The display device of claim 17, wherein the at least one switching transistor includes: a first transistor electrically connected between one electrode of the driving transistor and a data line, and that, in operation, receives the second scan signal through a first gate electrode; and a third transistor electrically connected between another electrode of the driving transistor and a gate electrode of the driving transistor, and that, in operation, receives the first scan signal through a third gate electrode. ### Claim 19 (depends on 16) The display device of claim 16, wherein the first scan signal and the second scan signal have different turn-on times.