# US 12,763,021 B2 · Display device including a light-emitting element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,763,021 B2 - Document ID: US12763021B2 - Status: Granted - Kind: B2 - Application number: 19/078,112 - Filed: 2025-03-12 - Published: 2025-12-18 - Granted: 2026-10-13 - Earliest claimed: 2024-06-12 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., LTD. - Inventors: Dae-Sik Lee; Seyun Kim; Kihyun Pyun; Seungho Park - Web page: https://patentgrep.com/patent/US12763021B2 ## CPC - 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 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - G09G 2330/021: Power management, e.g. power saving - G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD - G09G 2340/0435: Change or adaptation of the frame rate of the video stream - 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 including data lines, sensing lines, and pixels connected to the data lines and the sensing lines and including a light-emitting element, and a panel driver configured to provide a scan signal and a sensing signal to the pixels, to provide data voltages to the pixels through the data lines, to provide an initialization voltage to an anode of the light-emitting element through the sensing lines, to provide a first power supply voltage to the pixels, and to provide a second power supply voltage to a cathode of the light-emitting element of the pixels, wherein the light-emitting element is configured to be initialized based on a voltage difference between the initialization voltage and the second power supply voltage being less than a turn-on voltage of the light-emitting element by a margin voltage. ## Claims ### Claim 1 A display device comprising: a display panel comprising data lines, sensing lines, and pixels connected to the data lines and the sensing lines and comprising a light-emitting element; and a panel driver configured to provide a scan signal and a sensing signal to the pixels, to provide data voltages to the pixels through the data lines, to provide an initialization voltage to an anode of the light-emitting element through the sensing lines, to provide a first power supply voltage to the pixels, and to provide a second power supply voltage to a cathode of the light-emitting element of the pixels, wherein the light-emitting element is configured to be initialized based on a voltage difference between the initialization voltage and the second power supply voltage being less than a turn-on voltage of the light-emitting element by a margin voltage, and wherein the panel driver comprises: a controller configured to generate a positive voltage enable signal and a negative voltage enable signal; a first voltage generator configured to generate the first power supply voltage, which is positive, based on a first input voltage; a second voltage generator configured to generate the second power supply voltage, which is negative, based on the first input voltage, and to provide the second power supply voltage to a second power supply voltage line in response to the negative voltage enable signal; and a power management circuit comprising: an initialization voltage generator configured to generate the initialization voltage based on a second input voltage; and a positive voltage generator configured to generate a positive voltage, and to provide the positive voltage to the second power supply voltage line in response to the positive voltage enable signal. ### Claim 2 (depends on 1) The display device of claim 1, wherein the initialization voltage is positive, and the second power supply voltage is negative. ### Claim 3 (depends on 1) The display device of claim 1, wherein the pixels comprise: a capacitor comprising a first electrode connected to a gate node, and a second electrode connected to a source node; a first transistor comprising a gate connected to the gate node, a first terminal configured to receive the first power supply voltage, and a second terminal connected to the source node; a second transistor configured to connect a corresponding one of the data lines to the gate node in response to the scan signal; a third transistor configured to connect a corresponding one of the sensing lines to the source node in response to the sensing signal; and the light-emitting element comprising the anode connected to the source node, and the cathode connected to the second power supply voltage line. ### Claim 4 (depends on 1) The display device of claim 1, wherein, in a power-on period of the display device, the second power supply voltage is configured to be activated, and the first power supply voltage is configured to be activated thereafter. ### Claim 5 (depends on 1) The display device of claim 1, wherein, in a power-off period of the display device, the first power supply voltage is configured to be deactivated, and the second power supply voltage is configured to be deactivated thereafter. ### Claim 6 (depends on 1) The display device of claim 1, wherein the panel driver further comprises a sensing circuit configured to provide the initialization voltage to the pixels through the sensing lines in a driving period, and to perform a sensing operation for the pixels through the sensing lines in a sensing period. ### Claim 7 (depends on 6) The display device of claim 6, wherein, in the driving period, the positive voltage enable signal has an off-level, the negative voltage enable signal has an on-level, and the cathode of the light-emitting element is configured to receive the second power supply voltage, and wherein, in the sensing period, the positive voltage enable signal has an on-level, the negative voltage enable signal has an off-level, and the cathode of the light-emitting element is configured to receive the positive voltage generated by the positive voltage generator. ### Claim 8 (depends on 1) The display device of claim 1, wherein the panel driver further comprises a suitable power supply voltage storage configured to store a suitable voltage level determined by measuring a luminance of the display panel while gradually changing a voltage level of the second power supply voltage, and wherein the panel driver is configured to generate the second power supply voltage having the suitable voltage level. ### Claim 9 (depends on 1) The display device of claim 1, wherein the panel driver further comprises a temperature sensor configured to measure a temperature of the display panel, and wherein the panel driver is configured to adjust a voltage level of the second power supply voltage according to the temperature. ### Claim 10 (depends on 9) The display device of claim 9, wherein the panel driver is configured to increase the voltage level of the second power supply voltage as the temperature increases. ### Claim 11 (depends on 1) The display device of claim 1, wherein the panel driver further comprises a driving time accumulator configured to accumulate a driving time of the display panel, and wherein the panel driver is configured to adjust a voltage level of the second power supply voltage according to the driving time. ### Claim 12 (depends on 11) The display device of claim 11, wherein the panel driver is configured to decrease the voltage level of the second power supply voltage as the driving time increases. ### Claim 13 (depends on 1) The display device of claim 1, wherein the panel driver further comprises a suitable initialization voltage storage configured to store a suitable voltage level determined by measuring a luminance of the display panel while gradually changing a voltage level of the initialization voltage, and wherein the panel driver is configured to generate the initialization voltage having the suitable voltage level. ### Claim 14 A display device comprising: a display panel comprising data lines, sensing lines, and pixels connected to the data lines and the sensing lines and comprising a light-emitting element; and a panel driver configured to provide a scan signal and a sensing signal to the pixels, to provide data voltages to the pixels through the data lines, to provide a positive initialization voltage to an anode of the light-emitting element through the sensing lines, to provide a first power supply voltage, and to provide a negative second power supply voltage to a cathode of the light-emitting element, wherein the light-emitting element is configured to be initialized based on the initialization voltage and the second power supply voltage, and wherein the panel driver comprises: a controller configured to generate a positive voltage enable signal and a negative voltage enable signal; a first voltage generator configured to generate the first power supply voltage, which is positive, based on a first input voltage; a second voltage generator configured to generate the second power supply voltage, which is negative, based on the first input voltage, and to provide the second power supply voltage to a second power supply voltage line in response to the negative voltage enable signal; and a power management circuit comprising: an initialization voltage generator configured to generate the initialization voltage based on a second input voltage; and a positive voltage generator configured to generate a positive voltage, and to provide the positive voltage to the second power supply voltage line in response to the positive voltage enable signal. ### Claim 15 An electronic device comprising a display device comprising: a display panel comprising data lines, sensing lines, and pixels connected to the data lines and the sensing lines and comprising a light-emitting element; and a panel driver configured to provide a scan signal and a sensing signal to the pixels, to provide data voltages to the pixels through the data lines, to provide an initialization voltage to an anode of the light-emitting element through the sensing lines, to provide a first power supply voltage to the pixels, and to provide a second power supply voltage to a cathode of the light-emitting element of the pixels, wherein the light-emitting element is configured to be initialized based on a voltage difference between the initialization voltage and the second power supply voltage being less than a turn-on voltage of the light-emitting element by a margin voltage, and wherein the panel driver comprises: a controller configured to generate a positive voltage enable signal and a negative voltage enable signal; a first voltage generator configured to generate the first power supply voltage, which is positive, based on a first input voltage; a second voltage generator configured to generate the second power supply voltage, which is negative, based on the first input voltage, and to provide the second power supply voltage to a second power supply voltage line in response to the negative voltage enable signal; and a power management circuit comprising: an initialization voltage generator configured to generate the initialization voltage based on a second input voltage; and a positive voltage generator configured to generate a positive voltage, and to provide the positive voltage to the second power supply voltage line in response to the positive voltage enable signal. ### Claim 16 (depends on 15) The electronic device of claim 15, wherein the electronic device comprises a smartphone, a television, a monitor, a tablet, an electric vehicle, a mobile phone, a tablet personal computer (PC), a mobile communication terminal, an electronic notebook, an electronic book, a portable multimedia player (PMP), a navigation device, an ultra-mobile PC (UMPC), a laptop computer, a billboard, an Internet of Things (IoT) device, a smartwatch, a watch phone, or a head-mounted display (HMD).