# US 12,217,676 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 12,217,676 B2 - Document ID: US12217676B2 - Status: Granted - Kind: B2 - Application number: 18/120,104 - Filed: 2023-03-10 - Published: 2023-09-14 - Granted: 2025-02-04 - Earliest claimed: 2022-03-11 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Kyoungju Shin; Yangsoo Kim; Jungkook Park; Jaeyoung Oh; Woojin Lee; Jaeho Jung - Web page: https://patentgrep.com/patent/US12217676B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED] - G09G 2300/0426: Layout of electrodes and connections - G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with 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 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0238: Improving the black level - G09G 2320/0242: Compensation of deficiencies in the appearance of colours - H10K 59/131: Interconnections, e.g. wiring lines or terminals - H10K 59/35: comprising red-green-blue [RGB] subpixels - 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) - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES ## Abstract A pixel circuit of a display device includes first to sixth thin-film transistors, and first and second capacitors. The first thin-film transistor generates a driving current, the sixth thin-film transistor is connected between a light-emitting element and the first thin-film transistor and controls a transfer of the driving current, and the second capacitor is connected between a gate electrode of the sixth thin-film transistor and the light-emitting element. ## Claims ### Claim 1 A display device comprising: a display panel comprising: a pixel comprising: a pixel circuit comprising: a first thin-film transistor which comprises a gate electrode connected to a first node, a first electrode, and a second electrode, and generates a driving current; a second thin-film transistor connected between the first electrode of the first thin-film transistor and a data line; a third thin-film transistor connected between the first node and the second electrode of the first thin-film transistor; a fourth thin-film transistor connected between the first node and an initialization voltage line; a fifth thin-film transistor connected between the first electrode of the first thin-film transistor and a first driving voltage line; a sixth thin-film transistor which controls a transfer of the driving current; a first capacitor connected between the first node and the first driving voltage line; and a second capacitor; and a light-emitting element connected to the pixel circuit, wherein the sixth thin-film transistor is connected between the second electrode of the first thin-film transistor and the light-emitting element, and the second capacitor is connected between a gate electrode of the sixth thin-film transistor and the light-emitting element. ### Claim 2 (depends on 1) The display device of claim 1, wherein each of the fifth thin-film transistor and the sixth thin-film transistor is an n-channel metal-oxide semiconductor (“NMOS”) thin-film transistor including an oxide semiconductor layer. ### Claim 3 (depends on 1) The display device of claim 1, wherein each of the third thin-film transistor and the fourth thin-film transistor is an NMOS thin-film transistor including an oxide semiconductor layer. ### Claim 4 (depends on 1) The display device of claim 1, wherein each of the first thin-film transistor and the second thin-film transistor is a p-channel metal-oxide semiconductor (“PMOS”) thin-film transistor including a silicon semiconductor layer. ### Claim 5 (depends on 1) The display device of claim 1, wherein the pixel is provided in plural, and a plurality of pixels comprises a first color pixel, a second color pixel, and a third color pixel, wherein the first color pixel comprises a first pixel circuit and a first light-emitting element connected with the first pixel circuit, the second color pixel comprises a second pixel circuit and a second light-emitting element connected with the second pixel circuit, and the third color pixel comprises a third pixel circuit and a third light-emitting element connected with the third pixel circuit, and the first color pixel provides red light, the second color pixel provides green light, and the third color pixel provides blue light. ### Claim 6 (depends on 5) The display device of claim 5, wherein a first capacitance of the second capacitor of the first pixel circuit is different from each of a second capacitance of the second capacitor of the second pixel circuit and a third capacitance of the second capacitor of the third pixel circuit. ### Claim 7 (depends on 6) The display device of claim 6, wherein the second capacitance is larger than each of the first capacitance and the third capacitance, and the first capacitance is larger than the third capacitance. ### Claim 8 (depends on 5) The display device of claim 5, wherein a capacitance of the second light-emitting element is larger than each of those of the first light-emitting element and the third light-emitting element, and a capacitance of the first light-emitting element is larger than that of the third light-emitting element. ### Claim 9 (depends on 5) The display device of claim 5, wherein a first capacitance of the second capacitor of the first pixel circuit, a second capacitance of the second capacitor of the second pixel circuit, and a third capacitance of the second capacitor of the third pixel circuit are substantially same. ### Claim 10 (depends on 1) The display device of claim 1, wherein the second capacitor comprises: a first electrode connected to the gate electrode of the sixth thin-film transistor; and a second electrode connected to the light-emitting element, wherein the second electrode of the second capacitor is disposed in a same layer as the gate electrode of the first thin-film transistor. ### Claim 11 (depends on 1) The display device of claim 1, wherein the sixth thin-film transistor comprises: a semiconductor pattern; the gate electrode on the semiconductor pattern; a first connection electrode which is disposed on a plurality of insulation layers on the gate electrode and penetrates through the plurality of insulation layers to be connected to a first portion of the semiconductor pattern; and a second connection electrode which is disposed on the plurality of insulation layers and penetrates through the plurality of insulation layers to be connected to a second portion of the semiconductor pattern. ### Claim 12 (depends on 11) The display device of claim 11, wherein the second capacitor comprises: a first electrode under the semiconductor pattern; and a second electrode under the first electrode of the second capacitor. ### Claim 13 (depends on 12) The display device of claim 12, wherein a thickness of a gate insulation layer between the second electrode of the second capacitor and the first electrode of the second capacitor is less than that of the plurality of insulation layers. ### Claim 14 (depends on 12) The display device of claim 12, where the second electrode of the second capacitor is electrically connected to the second connection electrode. ### Claim 15 (depends on 1) The display device of claim 1, wherein the first capacitor comprises a first electrode electrically connected to the first node, and a second electrode electrically connected to the first driving voltage line, and the second capacitor comprises a third electrode electrically connected to the gate electrode of the sixth thin-film transistor and disposed in a same layer as the second electrode of the first capacitor, and a fourth electrode electrically connected with the light-emitting element and disposed in a same layer as the first electrode of the first capacitor. ### Claim 16 A display device comprising a display panel comprising: a pixel comprising: a pixel circuit comprising: a switching thin-film transistor which transfers a data signal according to a switching operation; a driving thin-film transistor which generates a driving current corresponding to the data signal; an NMOS-type light emission control thin-film transistor which controls the transfer of the driving current and including an oxide semiconductor layer; and a compensation capacitor; and a light-emitting element connected to the pixel circuit, wherein the NMOS-type light emission control thin-film transistor is connected between the driving thin-film transistor and the light-emitting element, and the compensation capacitor is connected between a gate electrode of the NMOS-type light emission control thin-film transistor and the light-emitting element. ### Claim 17 (depends on 16) The display device of claim 16, wherein the pixel is provided in plural, and a plurality of pixels comprises a first color pixel, a second color pixel, and a third color pixel, wherein the first color pixel comprises a first pixel circuit and a first light-emitting element connected with the first pixel circuit, the second color pixel comprises a second pixel circuit and a second light-emitting element connected with the second pixel circuit, and the third color pixel comprises a third pixel circuit and a third light-emitting element connected with the third pixel circuit, and the first color pixel provides red light, the second color pixel provides green light, and the third color pixel provides blue light. ### Claim 18 (depends on 17) The display device of claim 17, wherein a first capacitance of the compensation capacitor of the first pixel circuit, a second capacitance of the compensation capacitor of the second pixel circuit, and a third capacitance of the compensation capacitor of the third pixel circuit are different from each other. ### Claim 19 (depends on 17) The display device of claim 17, wherein a first capacitance of the compensation capacitor of the first pixel circuit, a second capacitance of the compensation capacitor of the second pixel circuit, and a third capacitance of the compensation capacitor of the third pixel circuit are substantially same as each other. ### Claim 20 (depends on 16) The display device of claim 16, wherein the NMOS-type light emission control thin-film transistor comprises: a semiconductor pattern; the gate electrode on the semiconductor pattern; a first connection electrode which is disposed on a plurality of insulation layers disposed on the gate electrode and penetrates through the plurality of insulation layers to be connected to a first portion of the semiconductor pattern; and a second connection electrode which is disposed on the plurality of insulation layers and penetrates through the plurality of insulation layers to be connected to a second portion of the semiconductor pattern, and the compensation capacitor comprises a first electrode under the semiconductor pattern and a second electrode under the first electrode of the compensation capacitor. ### Claim 21 A display device comprising: a display panel comprising: a pixel comprising a pixel circuit, the pixel circuit comprising: first thin-film transistor which comprises a gate electrode connected to a first node, a first electrode and a second electrode, and generates a driving current; a second thin-film transistor connected between the first electrode of the first thin-film transistor and a data line; a third thin-film transistor connected between the first node and the second electrode of the first thin-film transistor; a fourth thin-film transistor connected between the first node and an initialization voltage line; a fifth thin-film transistor connected between the first electrode of the first thin-film transistor and a first driving voltage line; a sixth thin-film transistor which controls a transfer of the driving current; a first capacitor connected between the first node and the first driving voltage line; and a second capacitor; and a light-emitting element connected to the pixel circuit, wherein each of the third thin-film transistor and the fourth thin-film transistor is an NMOS thin-film transistor including an oxide semiconductor layer, and each of the first thin-film transistor and the second thin-film transistor is a PMOS thin-film transistor including a silicon semiconductor layer, the sixth thin-film transistor is connected between the second electrode of the first thin-film transistor and the light-emitting element, and the second capacitor is connected between a gate electrode of the sixth thin-film transistor and the light-emitting element. ### Claim 22 (depends on 21) The display device of claim 21, wherein each of the fifth thin-film transistor and the sixth thin-film transistor is an NMOS thin-film transistor including an oxide semiconductor layer. ### Claim 23 (depends on 21) The display device of claim 21, wherein the pixel is provided in plural, and a plurality of pixels comprises a first color pixel, a second color pixel, and a third color pixel, wherein the first color pixel comprises a first pixel circuit and a first light-emitting element connected with the first pixel circuit, the second color pixel comprises a second pixel circuit and a second light-emitting element connected with the second pixel circuit, and the third color pixel comprises a third pixel circuit and a third light-emitting element connected with the third pixel circuit, and the first color pixel provides red light, the second color pixel provides green light, and the third color pixel provides blue, wherein a first capacitance of the second capacitor of the first pixel circuit is different from each of a second capacitance of the second capacitor of the second pixel circuit and a third capacitance of the second capacitor of the third pixel circuit.