# US 10,504,435 B2 · Pixel and an organic light-emitting display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,504,435 B2 - Document ID: US10504435B2 - Status: Granted - Kind: B2 - Application number: 15/464,723 - Filed: 2017-03-21 - Published: 2017-09-28 - Granted: 2019-12-10 - Earliest claimed: 2016-03-22 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Jin Jeon - Web page: https://patentgrep.com/patent/US10504435B2 ## CPC - G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element - 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 2300/043: Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver - G09G 2300/0809: Several active elements per pixel in active matrix panels - 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 2300/0866: by means of changes in the pixel supply voltage - G09G 2310/0245: Clearing or presetting the whole screen independently of waveforms, e.g. on power-on (G09G2310/063 takes precedence) - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - 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 pixel includes a storage capacitor connected between a first power line and a first node, a first transistor configured to control current flowing from a second node to a third node in response to a voltage of the first node, a second transistor configured to apply a data signal to the second node in response to a scan signal, a third transistor configured to connect the first node and the third node in response to the scan signal, a fourth transistor configured to connect the first power line and the second node in response to a control signal, and an organic light-emitting diode connected between the third node and a second power line. A level of a voltage applied to the second power line during an initialization period is greater than the level of the voltage applied to the second power line during an emission period. ## Claims ### Claim 1 An organic light-emitting display apparatus configured to be driven during a frame period comprising an initialization period, a scan period, and an emission period, the organic light-emitting display apparatus comprising: a pixel connected to a scan line configured to apply a scan signal, a data line configured to apply a data signal, a control line configured to apply a control signal, and first and second power lines, the pixel comprising: first through third nodes; a storage capacitor connected between the first power line and the first node; a first transistor configured to control current flowing from the second node to the third node in response to a voltage of the first node; a second transistor configured to apply the data signal to the second node in response to the scan signal; a third transistor configured to connect the first node to the third node in response to the scan signal; a fourth transistor configured to connect the first power line to the second node in response to the control signal; an organic light-emitting diode connected between the third node and the second power line; and a control driver configured to drive the first and second power lines and the control line, wherein the control applies a first level of voltage to the second power line during the initialization period, a second level of voltage to the second power line during the scan period, and a third level voltage to the second power line during the emission period, and wherein the first level is higher than the second level, and the second level is higher than the third level. ### Claim 2 (depends on 1) The organic light-emitting display apparatus of claim 1, wherein the control driver applies a forth level of voltage to the first power line during the initialization period, and a fifth level of voltage to the first power line during the emission period, wherein the fifth level is higher than forth level. ### Claim 3 (depends on 2) The organic light-emitting display apparatus of claim 2, wherein the control driver applies the fifth level of voltage to the first power line during the scan period. ### Claim 4 (depends on 2) The organic light-emitting display apparatus of claim 2, wherein a difference between the first level and the third level is greater than a difference between the fifth level and the forth level. ### Claim 5 (depends on 2) The organic light-emitting display apparatus of claim 2, wherein the second level is substantially the same as the fifth level, and the third level is substantially the same as the fourth level. ### Claim 6 (depends on 2) The organic light-emitting display apparatus of claim 2, wherein: the control driver applies a sixth level of voltage, as the control signal, to the fourth transistor during the scan period to turn off the fourth transistor, and the control driver applies a seventh level of voltage, as the control signal, to the fourth transistor during the emission period to turn on the fourth transistor. ### Claim 7 (depends on 6) The organic light-emitting display apparatus of claim 6, wherein the sixth level is substantially the same as the first level. ### Claim 8 (depends on 6) The organic light-emitting display apparatus of claim 6, wherein the control driver applies the seventy level of voltage, as the control signal, to the fourth transistor during the initialization period to turn on the fourth transistor. ### Claim 9 An organic light-emitting display apparatus configured to be driven during a frame period comprising an initialization period, a scan period, and an emission period, the organic light-emitting display apparatus comprising a pixel comprising: a storage capacitor connected between a first power line and a first node; a first transistor comprising a gate terminal connected to the first node, wherein the first transistor is connected between second and third nodes; a second transistor comprising a gate terminal connected to a scan line, wherein the second transistor is connected between a data line and the second node; a third transistor comprising a gate terminal connected to the scan line, wherein the third transistor is connected between the first and third nodes; a fourth transistor comprising a gate terminal connected to a control line, wherein the fourth transistor is connected between the first power line and the second node; an organic light-emitting diode connected between the third node and a second power line; and a control driver configured to drive the first and second power lines and the control line, wherein: during the initialization period, the control driver applies a first level of voltage to the second power line and a second level of voltage to the first power line, during the emission period, the control driver applies a third level of voltage to the first power line and a fourth level of voltage to the second power line, and a difference between the first level and the second level is greater than a difference between the third level and the fourth level. ### Claim 10 (depends on 9) The organic light-emitting display apparatus of claim 9, wherein: during the emission period, the control driver applies a first driving voltage to the first power line, and a second driving voltage, which is less than the first driving voltage, to the second power line, and during the initialization period, the control driver applies the second driving voltage to the first power line, and a gate-off voltage, which is greater than the first driving voltage, to the second power line. ### Claim 11 (depends on 9) The organic light-emitting display apparatus of claim 9, wherein during the scan period, the control driver applies the first driving voltage to the first and second power lines. ### Claim 12 (depends on 9) The organic light-emitting display apparatus of claim 9, wherein the control driver applies a gate-off voltage to the control line during the scan period, and a gate-on voltage to the control line during the initialization period and the emission period. ### Claim 13 An organic light-emitting display apparatus configured to be driven during a frame period comprising an initialization period, a scan period, and an emission period, the organic light-emitting display apparatus comprising: a display unit comprising pixels; a voltage generator configured to generate a first driving voltage, a second driving voltage that is less than the first driving voltage, a first gate voltage that is greater than the first driving voltage, and a second gate voltage that is less than the first gate voltage; and a control driver configured to drive first and second power lines and a control line connected to the pixels by using the first and second driving voltages and the first and second gate voltages, wherein the control driver applies the first gate voltage to the second power line during the initialization period. ### Claim 14 (depends on 13) The organic light-emitting display apparatus of claim 13, wherein each of the pixels comprises: a storage capacitor connected between the first power tine and a first node; a first transistor comprising a gate terminal connected to the first node, wherein the first transistor is connected between second and third nodes; a second transistor comprising a gate terminal connected to a scan line, wherein the second transistor is connected between a data line and the second node; a third transistor comprising a gate terminal connected to the scan line, wherein the third transistor is connected between the first and third nodes; a fourth transistor comprising a gate terminal connected to the control line, wherein the fourth transistor is connected between the first power line and the second node; and an organic light-emitting diode connected between the third node and the second power line. ### Claim 15 (depends on 13) The organic light-emitting display apparatus of claim 13, wherein the control driver applies the second driving voltage to the first power line during the initialization period. ### Claim 16 (depends on 13) The organic light-emitting display apparatus of claim 13, wherein the control driver applies the first driving voltage to the first power line and the second power line during the scan period. ### Claim 17 (depends on 13) The organic light-emitting display apparatus of claim 13, wherein the control driver applies the first driving voltage to the first power line and applies the second driving voltage to the second power line during the emission period. ### Claim 18 (depends on 13) The organic light-emitting display apparatus of claim 13, wherein the control driver applies the second gate voltage to the control line during the initialization period and the emission period, and applies the first gate voltage to the control line during the scan period. ### Claim 19 (depends on 13) The organic light-emitting display apparatus of claim 13, wherein the pixels sequentially receive data signals during the scan period, substantially simultaneously emit light when the emission period starts, and substantially simultaneously stop light emission when the initialization period starts.