# US 2021/0241689 A1 · Pixel and display device including the same

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- Number: US 2021/0241689 A1
- Document ID: US20210241689A1
- Status: Published application
- Kind: A1
- Application number: 17/110,725
- Filed: 2020-12-03
- Published: 2021-08-05
- Earliest claimed: 2020-02-04
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Jeongsoo LEE; Kyunghyun BAEK; Sewan SON; Yoonjong CHO; Moosoon KO; Yeonha BAEK; Seokje SEONG; Jinsung AN; Inhyuck YEO; Seongjun LEE; Jaehyun LEE
- Web page: https://patentgrep.com/patent/US20210241689A1

## 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 3/3275: Details of drivers for data electrodes
- H10D 86/423: {comprising semiconductor materials not belonging to the Group IV, e.g. InGaZnO}
- H10D 86/441: {Interconnections, e.g. scanning lines}
- H10D 86/60: wherein the TFTs are in active matrices
- G09G 2300/0426: Layout of electrodes and connections
- 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 2310/0286: Details of a shift registers arranged for use in a driving circuit
- H10D 86/481: {integrated with passive devices, e.g. auxiliary capacitors}
- 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)
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES

## Abstract

A pixel including: a light-emitting diode; a first PMOS transistor including a first electrode connected to a node and a second electrode transmitting a driving current to the light-emitting diode; a second transistor connected between a data line and the node and turned on by a first scan signal; a third NMOS transistor connected between a gate electrode and the second electrode of the first transistor and turned on by a first emission control signal; a fourth NMOS transistor connected between the gate electrode of the first transistor and a first initialization voltage line and turned on by a second emission control signal; a fifth transistor connected between a driving voltage line and the node and turned on by the first emission control signal; and a sixth transistor connected between the second electrode of the first transistor and the light-emitting diode and turned on by the first emission control signal.

## Claims

### Claim 1

A pixel comprising:
a light-emitting diode;
a first transistor comprising a gate electrode, a first electrode connected to a node, and a second electrode connected to the light-emitting diode and transmitting a driving current to the light-emitting diode;
a second transistor connected between a data line and the node and turned on by a first scan signal;
a third transistor connected between the gate electrode and the second electrode of the first transistor and turned on by a first emission control signal;
a fourth transistor connected between the gate electrode of the first transistor and a first initialization voltage line and turned on by a second emission control signal;
a fifth transistor connected between a driving voltage line and the node and turned on by the first emission control signal; and
a sixth transistor connected between the second electrode of the first transistor and the light-emitting diode and turned on by the first emission control signal,
wherein the first transistor comprises a PMOS transistor, and the third transistor and the fourth transistor each comprises an NMOS transistor.

### Claim 2 (depends on 1)

The pixel of claim 1, wherein the PMOS transistor comprises a silicon semiconductor, and
the NMOS transistors comprise an oxide semiconductor.

### Claim 3 (depends on 1)

The pixel of claim 1, further comprising:
a first capacitor connected between the driving voltage line and the gate electrode of the first transistor; and
a second capacitor connected between the gate electrode of the first transistor and a gate electrode of the second transistor.

### Claim 4 (depends on 1)

The pixel of claim 1, wherein the second emission control signal is output before the first emission control signal.

### Claim 5 (depends on 1)

The pixel of claim 1, further comprising:
a first scan line connected to a gate electrode of the second transistor;
a second scan line connected to a gate electrode of the fourth transistor; and
an emission control line connected to gate electrodes of the third transistor, the fifth transistor, and the sixth transistor.

### Claim 6 (depends on 1)

The pixel of claim 1, further comprising:
a first scan line connected to a gate electrode of the second transistor;
a second scan line connected to a gate electrode of the fourth transistor;
a third scan line connected to a gate electrode of the third transistor; and
an emission control line connected to gate electrodes of the fifth transistor and the sixth transistor,
wherein the third scan line is a branch line of the emission control line.

### Claim 7 (depends on 1)

The pixel of claim 1, further comprising a seventh transistor connected between the light-emitting diode and a second initialization voltage line and turned on by a second scan signal.

### Claim 8 (depends on 7)

The pixel of claim 7, wherein the second scan signal is output before the first scan signal or is output after the first scan signal.

### Claim 9 (depends on 7)

The pixel of claim 7, wherein the second transistor, the fifth transistor, the sixth transistor, and the seventh transistor each comprises a PMOS transistor comprising a silicon semiconductor.

### Claim 10

A display device comprising:
a plurality of pixels;
a scan driving circuit configured to supply scan signals to the plurality of pixels;
an emission control driving circuit configured to supply emission control signals to the plurality of pixels; and
a data driving circuit configured to supply data signals to the plurality of pixels,
wherein each of the plurality of pixels comprises:
a light-emitting diode;
a first transistor comprising a gate electrode, a first electrode connected to a node, and a second electrode connected to the light-emitting diode and transmitting a driving current to the light-emitting diode;
a second transistor connected between a data line and the node and turned on by a first scan signal;
a third transistor connected between the gate electrode and the second electrode of the first transistor and turned on by a first emission control signal;
a fourth transistor connected between the gate electrode of the first transistor and a first initialization voltage line and turned on by a second emission control signal;
a fifth transistor connected between a driving voltage line and the node and turned on by the first emission control signal; and
a sixth transistor connected between the second electrode of the first transistor and the light-emitting diode and turned on by the first emission control signal,
wherein the first transistor comprises a PMOS transistor, and the third transistor and the fourth transistor each comprises an NMOS transistor.

### Claim 11 (depends on 10)

The display device of claim 10, wherein the PMOS transistor comprises a silicon semiconductor, and
the NMOS transistors comprise an oxide semiconductor.

### Claim 12 (depends on 10)

The display device of claim 10, wherein each of the plurality of pixels comprises:
a first capacitor connected between the driving voltage line and the gate electrode of the first transistor; and
a second capacitor connected between the gate electrode of the first transistor and a gate electrode of the second transistor.

### Claim 13 (depends on 10)

The display device of claim 10, wherein the emission control driving circuit sequentially outputs the emission control signals shifted by an interval, and
the second emission control signal is output before the first emission control signal.

### Claim 14 (depends on 10)

The display device of claim 10, wherein each of the plurality of pixels further comprises:
a first scan line connected to a gate electrode of the second transistor;
a second scan line connected to a gate electrode of the fourth transistor; and
an emission control line connected to gate electrodes of the third transistor, the fifth transistor, and the sixth transistor,
wherein the scan driving circuit is connected to the first scan line, and
the emission control driving circuit is connected to the second scan line and the emission control line.

### Claim 15 (depends on 10)

The display device of claim 10, wherein each of the plurality of pixels further comprises:
a first scan line connected to a gate electrode of the second transistor;
a second scan line connected to a gate electrode of the fourth transistor;
a third scan line connected to a gate electrode of the third transistor; and
an emission control line connected to gate electrodes of the fifth transistor and the sixth transistor,
wherein the third scan line is a branch line of the emission control line,
the scan driving circuit is connected to the first scan line, and
the emission control driving circuit is connected to the second scan line and the emission control line.

### Claim 16 (depends on 10)

The display device of claim 10, wherein each of the plurality of pixels further comprises a seventh transistor connected between the light-emitting diode and a second initialization voltage line and turned on by a second scan signal supplied via a fourth scan line connected to the gate electrode of the seventh transistor.

### Claim 17 (depends on 16)

The display device of claim 16, wherein the scan driving circuit sequentially outputs the scan signals shifted by an interval, and
the second scan signal is output before the first scan signal or is output after the first scan signal.

### Claim 18 (depends on 16)

The display device of claim 16, wherein the second transistor, the fifth transistor, the sixth transistor, and the seventh transistor each comprises a PMOS transistor comprising a silicon semiconductor.

### Claim 19 (depends on 10)

The display device of claim 10, wherein each of the third transistor and the fourth transistor comprises a lower gate electrode and an upper gate electrode.

### Claim 20 (depends on 19)

The display device of claim 19, wherein the lower gate electrode of the third transistor and the lower gate electrode of the fourth transistor are on different layers.