# US 2017/0256200 A1 · A pixel driving circuit and method, an array substrate and a display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0256200 A1 - Document ID: US20170256200A1 - Status: Published application - Kind: A1 - Application number: 15/307,788 - Filed: 2015-10-23 - Published: 2017-09-07 - Earliest claimed: 2015-06-03 - Assignees: Boe Technology Group Co., Ltd. - Applicants: Boe Technology Group Co., Ltd. - Inventors: Liye DUAN; Lirong WANG; Chungchun LEE; Chiehhsing CHUNG; Junjie LIN - Web page: https://patentgrep.com/patent/US20170256200A1 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element - G09G 2300/0426: Layout of electrodes and connections - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - 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 2310/0262: 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 2320/0214: with crosstalk due to leakage current of pixel switch in active matrix panels - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/043: Preventing or counteracting the effects of ageing - G09G 2320/0626: for control of overall brightness - G09G 2330/023: using energy recovery or conservation - 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 The present disclosure provides a pixel driving circuit, an array substrate and a display device. The pixel driving circuit comprises a charge storage unit, for receiving a power supply voltage signal; a driving unit, for generating a driving current that drives the OLED to emit light; a reset unit, for writing a voltage of an initial voltage signal into a second terminal of the charge storage unit in a reset phase; a data write unit, for writing a voltage of a data voltage signal and the threshold voltage of the driving unit into the second terminal of the charge storage unit in a data write phase; and a light emitting control unit, for controlling the power supply voltage signal to be written into the driving unit so as to generate the driving signal in a light emitting phase. ## Claims ### Claim 1 A pixel driving circuit for driving an organic light emitting diode to emit light, comprising: a charge storage unit, a first terminal of the charge storage unit receiving a power supply voltage signal; a driving unit, a control terminal of the driving unit being connected with a second terminal of the charge storage unit, for generating a driving current that drives the organic light emitting diode to emit light when a voltage of the second terminal of the charge storage unit is greater than a threshold voltage of the driving unit; a reset unit, connected with the second terminal of the charge storage unit, for writing a voltage of an initial voltage signal into the second terminal of the charge storage unit in a reset phase; a data write unit, connected with the second terminal of the charge storage unit, for writing a voltage of a data voltage signal and the threshold voltage of the driving unit into the second terminal of the charge storage unit in a data write phase; and a light emitting control unit, connected with the driving unit, for controlling the power supply voltage signal to be written into the driving unit so as to generate the driving signal in a light emitting phase. ### Claim 2 (depends on 1) The pixel driving circuit according to claim 1, wherein the driving unit comprises a driving transistor, a control terminal of the driving transistor is connected with the second terminal of the charge storage unit, a first electrode of the driving transistor receives the power supply voltage signal through the light emitting control unit, a second electrode of the driving transistor is connected with the organic light emitting diode through the light emitting control unit. ### Claim 3 (depends on 2) The pixel driving circuit according to claim 2, wherein the reset unit comprises a first transistor, a control terminal of the first transistor receives a reset switch signal, a first electrode of the first transistor receives the initial voltage signal, a second electrode of the first transistor is connected with the second terminal of the charge storage unit. ### Claim 4 (depends on 3) The pixel driving circuit according to claim 3, wherein the data write unit comprises a second transistor and a third transistor, a control terminal of the second transistor and a control terminal of the third transistor both receive a first control signal, a first electrode of the second transistor is connected with the control terminal of the driving transistor, a second electrode of the second transistor is connected with the second electrode of the driving transistor, a first electrode of the third transistor receives the data voltage signal, a second electrode of the transistor is connected with the first electrode of the driving transistor. ### Claim 5 (depends on 4) The pixel driving circuit according to claim 4, wherein the light emitting control unit comprises a fourth transistor and a fifth transistor, a control terminal of the fourth transistor and a control terminal of the fifth transistor both receive a second control signal, a first electrode of the fourth transistor receives the power supply voltage signal, a second electrode of the fourth transistor is connected with the first electrode of the driving transistor, a first electrode of the fifth transistor is connected with the second electrode of the driving transistor, a second electrode of the fifth transistor is connected with the organic light emitting diode. ### Claim 6 (depends on 5) The pixel driving circuit according to claim 5, wherein the driving transistor, the first transistor, the second transistor, the third transistor, the fourth transistor and fifth transistor are all thin film transistors. ### Claim 7 (depends on 5) The pixel driving circuit according to claim 5, wherein the pixel driving unit further comprises: a potential compensation unit, connected with the control terminal of the driving unit, for providing leakage compensation for the control terminal of the driving unit in the light emitting phase. ### Claim 8 (depends on 7) The pixel driving circuit according to claim 7, wherein the potential compensation unit comprises anti-leakage transistor, a control terminal of the anti-leakage transistor receives a third control signal, a first electrode of the anti-leakage transistor receives the power supply voltage signal, a second electrode of the anti-leakage transistor is connected with the control terminal of the driving transistor. ### Claim 9 (depends on 8) The pixel driving circuit according to claim 8, wherein the third control signal and the second control signal have the same phase. ### Claim 10 (depends on 1) The pixel driving circuit according to claim 1, wherein the initial voltage signal is a constant-level signal. ### Claim 11 (depends on 5) The pixel driving circuit according to claim 5, wherein the initial voltage signal and the second control signal have opposite phases. ### Claim 12 (depends on 1) A pixel driving method, applied in the pixel driving circuit according to claim 1, comprising: in a reset phase, a reset switch signal turns on a reset unit, the reset unit writes a voltage of an initial voltage signal into a charge storage unit; in a data write phase, a first control signal turns on a data write unit, the data write unit writes a voltage of a data voltage signal and a threshold voltage of a driving unit into the charge storage unit, the driving unit generates a driving current that drives an organic light emitting diode to emit light when the voltage written into the charge storage unit is greater than the threshold voltage of the driving unit; and in a light emitting phase, a second control signal turns on a light emitting control unit, the light emitting control unit controls the power supply voltage signal to be written into the driving unit so as to generate the driving current. ### Claim 13 (depends on 12) The pixel driving method according to claim 12, wherein the pixel driving circuit further comprises a potential compensation unit connected with a control terminal of the driving unit, the pixel driving method further comprises: in the light emitting phase, a third control signal turns on the potential compensation unit, the potential compensation unit provides leakage compensation for a control terminal of the driving unit. ### Claim 14 (depends on 13) The pixel driving method according to claim 13, wherein the third control signal and the second control signal have the same phase. ### Claim 15 (depends on 12) The pixel driving method according to claim 12, wherein the initial voltage signal is a constant-level signal. ### Claim 16 (depends on 12) The pixel driving method according to claim 12, wherein the initial voltage signal and the second control signal have opposite phases. ### Claim 17 (depends on 1) An array substrate, comprising the pixel driving circuit according to claim 1. ### Claim 18 (depends on 17) A display device, comprising the array substrate according to claim 17.