# US 2017/0256205 A1 · Organic light-emitting pixel driving circuit, driving method thereof, and organic light-emitting display panel

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- Number: US 2017/0256205 A1
- Document ID: US20170256205A1
- Status: Published application
- Kind: A1
- Application number: 15/599,541
- Filed: 2017-05-19
- Published: 2017-09-07
- Earliest claimed: 2016-12-20
- Assignees: Shanghai Tianma Am-Oled Co., Ltd.; Tianma Micro-Electronics Co., Ltd.
- Applicants: Shanghai Tianma AM-OLED Co., Ltd.; Tianma Micro-Electronics Co., Ltd.
- Inventors: Renyuan ZHU; Yue LI; Tong WU
- Web page: https://patentgrep.com/patent/US20170256205A1

## 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 2320/0219: Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/043: Preventing or counteracting the effects of ageing
- 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

An organic light-emitting pixel driving circuit, a driving method thereof, and an organic light-emitting display panel are provided. The organic light-emitting pixel driving circuit comprises a light-emitting element, a driving transistor for driving the light-emitting element, an initialization unit, a storage unit, a data write-in unit, and a light-emitting control unit. The initialization unit is configured to transmit a first power supply voltage signal to a gate electrode of the driving transistor and transmit a reference voltage signal to a source electrode of the driving transistor and an anode of the light-emitting element. The storage unit is configured to maintain a voltage signal transmitted to the driving transistor. The data write-in unit is configured to transmit a data voltage signal to the gate electrode of the driving transistor, thus compensating a threshold voltage of the driving transistor. The light-emitting control unit is configured to control the light-emitting element.

## Claims

### Claim 1

An organic light-emitting pixel driving circuit, comprising:
a light-emitting element;
a driving transistor, configured to drive the light-emitting element;
an initialization unit, configured to transmit a first power supply voltage signal to a gate electrode of the driving transistor and transmit a reference voltage signal to a source electrode of the driving transistor and an anode of the light-emitting element;
a storage unit, configured to maintain a voltage signal transmitted to the driving transistor;
a data write-in unit, configured to transmit a data voltage signal to the gate electrode of the driving transistor and allow the data voltage signal to compensate a threshold voltage of the driving transistor; and
a light-emitting control unit, configured to control the light-emitting element to emit light.

### Claim 2 (depends on 1)

The organic light-emitting pixel driving circuit according to claim 1, wherein:
the storage unit includes a first capacitor and a second capacitor,
a first plate of the first capacitor is connected to the gate electrode of the driving transistor, and a second plate of the first capacitor is connected to the source electrode of the driving transistor,
a first plate of the second capacitor is connected to the source electrode of the driving transistor, and a second plate of the second capacitor accesses a fixe voltage, and
a light-emitting control unit includes a first light-emitting control unit and a second light-emitting control unit.

### Claim 3 (depends on 2)

The organic light-emitting pixel driving circuit according to claim 2, further comprising:
a data line, configured to output the data voltage signal;
a first scanning signal line, configured to carry a signal that controls the initialization unit;
a second scanning signal line, configured to carry a signal that controls the date write-in unit;
a first light-emitting control signal line connected to the first light-emitting control unit,
a second light-emitting control signal line connected to the second light-emitting control unit,
a first power supply end, configured to output the first power supply voltage signal, and
a second power supply end, configured to output a second power supply voltage signal.

### Claim 4 (depends on 3)

The organic light-emitting pixel driving circuit according to claim 3, wherein:
the first light-emitting control unit includes a first transistor,
a gate electrode of the first transistor is connected to the first light-emitting control signal line, a first electrode of the first transistor is connected to the first power supply voltage end, and a second electrode of the first transistor is connected to a drain electrode of the driving transistor.

### Claim 5 (depends on 4)

The organic light-emitting pixel driving circuit according to claim 4, wherein:
the second light-emitting control unit includes a second transistor,
a gate electrode of the second transistor is connected to the second light-emitting control signal line, a first electrode of the second transistor is connected to the source electrode of the driving transistor, and a second electrode of the second transistor is connected to the anode of the light-emitting element.

### Claim 6 (depends on 5)

The organic light-emitting pixel driving circuit according to claim 5, wherein:
the initialization unit includes a third transistor and a fourth transistor,
a gate electrode of the third transistor is connected to the first scanning signal line, a first electrode of the third transistor is connected to the second electrode of the first transistor, and a second electrode of the third transistor is connected to the gate electrode of the driving transistor, and
a gate electrode of the fourth transistor is connected to the second scanning signal line, a first electrode of the fourth transistor is connected to the reference voltage end, and a second electrode of the fourth transistor is connected to the anode of the light-emitting element and the second electrode of the second transistor.

### Claim 7 (depends on 6)

The organic light-emitting pixel driving circuit according to claim 6, wherein:
a second plate of the second capacitor is connected to the first power supply voltage end.

### Claim 8 (depends on 7)

The organic light-emitting pixel driving circuit according to claim 7, wherein:
the data write-in unit includes a fifth transistor, and
a gate electrode of the fifth transistor is connected to the second scanning signal line, a first electrode of the fifth transistor is connected to the data line, and a second electrode of the fifth transistor is connected to the gate electrode of the driving transistor.

### Claim 9 (depends on 6)

The organic light-emitting pixel driving circuit according to claim 6, wherein:
a second plate of the second capacitor is connected to the second power supply voltage end.

### Claim 10 (depends on 6)

The organic light-emitting pixel driving circuit according to claim 6, wherein:
a second plate of the second capacitor is connected to the reference voltage end.

### Claim 11 (depends on 3)

The organic light-emitting pixel driving circuit according to claim 3, wherein:
capacitance value of the second capacitor is greater than capacitance value of the first capacitor.

### Claim 12 (depends on 3)

The organic light-emitting pixel driving circuit according to claim 3, wherein:
a signal carried by the first light-emitting control signal line is obtained by converting phase of a signal carried by the second scanning signal line via a phase inverter.

### Claim 13 (depends on 1)

The organic light-emitting pixel driving circuit according to claim 1, wherein:
the light-emitting element is an organic light-emitting diode.

### Claim 14

A driving method for driving an organic light-emitting pixel driving circuit, wherein the organic light-emitting pixel driving circuit includes a light-emitting element, a driving transistor, an initialization unit under control of a first scanning signal line, a storage unit, a data write-in unit under control of a second scanning signal line, a first light-emitting control unit under control of a first light-emitting control signal line, and a second light-emitting control unit under control of a second light-emitting control signal line, the driving method comprising:
in an initialization stage, providing a first voltage level signal to the first scanning signal line, the first light-emitting control signal line, and the second light-emitting control signal line; and
providing a second voltage level signal to the second scanning signal line,
wherein the first light-emitting control unit and the initialization unit transmit a first power supply voltage signal to the gate electrode of the driving transistor, and
the initialization unit transmits a reference voltage signal to the anode of the light-emitting element and a source electrode of the driving transistor.

### Claim 15 (depends on 14)

The driving method according to claim 14, further comprising:
in a threshold detection stage, providing the first voltage level signal to the first scanning signal line and the first light-emitting control signal line; and
providing the second voltage level signal to the second scanning signal line and the second light-emitting control signal line,
wherein the first power supply voltage signal is transmitted to the gate electrode of the driving transistor,
the reference voltage signal is transmitted to the anode of the light-emitting element but not to the source electrode of the driving transistor,
a voltage level of the source electrode of the driving transistor is raised to equal the voltage level of the gate electrode of the driving transistor minus a threshold value of the driving transistor, such that the driving transistor is turned off, and
voltage levels of the source and gate electrodes of the driving transistor are maintained.

### Claim 16 (depends on 15)

The driving method according to claim 15, further comprising:
in a voltage coupling stage, providing the first voltage level signal to the second scanning signal line, and providing the second voltage level signal to the first scanning signal line, the first light-emitting control signal line and the second light-emitting control signal line, such that the driving transistor is turned off, the data voltage signal is transmitted to the gate electrode of the driving transistor, and the threshold voltage of the driving transistor is compensated, and
in a light-emitting stage, providing the first voltage level signal to the first and second light-emitting control signal lines, and providing the second voltage level signal to the first and second scanning signal lines, such that the driving transistor is turned on to allow the light-emitting element to emit light.

### Claim 17 (depends on 16)

The driving method according to claim 16, wherein:
a voltage level of the reference voltage signal is lower than a voltage level of the second power supply voltage signal.

### Claim 18

An organic light-emitting display panel, comprising:
a plurality of rows of pixel units,
wherein each row of the plurality of rows of pixel units comprises a plurality of organic light-emitting pixel driving circuits, and
an organic light-emitting pixel driving circuit comprises:
a light-emitting element;
a driving transistor, configured to drive the light-emitting element;
an initialization unit, configured to transmit a first power supply voltage signal to a gate electrode of the driving transistor and transmit a reference voltage signal to a source electrode of the driving transistor and an anode of the light-emitting element;
a storage unit, configured to maintain a voltage signal transmitted to the driving transistor;
a data write-in unit, configured to transmit a data voltage signal to the gate electrode of the driving transistor, and allow the data voltage signal to compensate a threshold voltage of the driving transistor; and
a light-emitting control unit, configured to control the light-emitting element to emit light.

### Claim 19 (depends on 18)

The organic light-emitting display panel according to claim 18, wherein:
each row of the plurality of rows of pixel units is connected to a first scanning signal line and a second scanning signal line.

### Claim 20 (depends on 19)

The organic light-emitting display panel according to claim 19, wherein:
a second scanning signal line connected to an ith row of pixel units is multiplexed as a first scanning signal line connected to an (i+1)th row of pixel units, where i is a positive integer.