# US 12,120,914 B2 · Display device and manufacturing method thereof

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- Number: US 12,120,914 B2
- Document ID: US12120914B2
- Status: Granted
- Kind: B2
- Application number: 16/958,890
- Filed: 2019-08-23
- Published: 2022-11-24
- Granted: 2024-10-15
- Earliest claimed: 2019-08-23
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.
- Inventors: Dachao Li; Shengji Yang; Chen Xu
- Web page: https://patentgrep.com/patent/US12120914B2

## CPC

- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED]
- H10D 86/441: {Interconnections, e.g. scanning lines}
- H10D 86/481: {integrated with passive devices, e.g. auxiliary capacitors}
- H10D 86/60: wherein the TFTs are in active matrices
- H10K 59/1213: {the pixel elements being TFTs}
- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2300/0814: used for selection purposes, e.g. logical AND for partial update
- 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 2320/0238: Improving the black level
- G09G 2320/0252: Improving the response speed
- G09G 2330/021: Power management, e.g. power saving
- G09G 2330/04: Display protection
- H10K 59/1201: {Manufacture or treatment}
- 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
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display device and a manufacturing method thereof are disclosed. The display device includes a base substrate and at least one pixel circuit provided on the base substrate, and the pixel circuit includes a driving transistor, a first transistor, and a second transistor; the driving transistor includes a control electrode, a first electrode, and a second electrode; the first transistor includes a first active region, the second transistor includes a second active region, the driving transistor includes a fourth active region, at least one of a doping concentration of the first active region and a doping concentration of the second active region is greater than a doping concentration of the fourth active region.

## Claims

### Claim 1

A display device, comprising a base substrate and at least one pixel circuit provided on the base substrate, wherein
the pixel circuit comprises a driving transistor, a first transistor, and a second transistor;
the driving transistor comprises a control electrode, a first electrode, and a second electrode, and is configured to control a driving current, flowing through the first electrode of the driving transistor and the second electrode of the driving transistor, for driving a light-emitting element to emit light according to a voltage of the control electrode of the driving transistor;
the first transistor is connected to the control electrode of the driving transistor, and is configured to write a data signal to the control electrode of the driving transistor in response to a first scan signal;
the second transistor is connected to the control electrode of the driving transistor, and is configured to write the data signal to the control electrode of the driving transistor in response to a second scan signal; and
the first transistor comprises a first active region, the second transistor comprises a second active region, the driving transistor comprises a fourth active region, the pixel circuit further comprises a third transistor, and the third transistor is connected to the first electrode of the driving transistor, and is configured to apply a first power supply voltage to the first electrode of the driving transistor in response to a light-emitting control signal; and the third transistor comprises a third active region, and both of a doping concentration of the first active region and a doping concentration of the second active region are larger than both a doping concentration of the third active region and a doping concentration of the fourth active region.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein
the doping concentration of the fourth active region is smaller than the doping concentration of the third active region.

### Claim 3 (depends on 1)

The display device according to claim 1, wherein the doping concentration of the fourth active region is 4 orders of magnitude smaller than the doping concentration of the third active region.

### Claim 4 (depends on 3)

The display device according to claim 3, wherein the doping concentration of the third active region comprises 1017 cm−3, the doping concentration of the fourth active region comprises 1013 cm−3.

### Claim 5 (depends on 1)

The display device according to claim 1, wherein
the doping concentration of the first active region and the doping concentration of the second active region are both 3 orders of magnitude greater than the doping concentration of the third active region.

### Claim 6 (depends on 5)

The display device according to claim 5, wherein
the doping concentration of the third active region comprises 1017 cm−3, and the doping concentration of the first active region and the doping concentration of the second active region both comprise 1020 cm−3.

### Claim 7 (depends on 1)

The display device according to claim 1, wherein the first transistor is a MOS transistor with a first semiconductor type, the second transistor, the third transistor, and the driving transistor are all MOS transistors with a second semiconductor type, and a doping type of the first semiconductor type is opposite to a doping type of the second semiconductor type.

### Claim 8 (depends on 1)

The display device according to claim 1, wherein
a direction from a first electrode of the first transistor to a second electrode of the first transistor is a first direction, a direction from a first electrode of the second transistor to a second electrode of the second transistor is a second direction, a direction from a first electrode of the third transistor to a second electrode of the third transistor is a third direction, and a direction from the first electrode of the driving transistor to the second electrode of the driving transistor is a fourth direction; and
at least one of the first direction, the second direction, and the third direction intersects with the fourth direction.

### Claim 9 (depends on 1)

The display device according to claim 1, wherein
a first electrode of the first transistor and a first electrode of the second transistor are connected to obtain a common electrode, and are connected to the control electrode of the driving transistor through the common electrode;
a control electrode of the first transistor is configured to receive the first scan signal, and a second electrode of the first transistor is configured to receive the data signal;
a control electrode of the second transistor is configured to receive the second scan signal, and a second electrode of the second transistor is configured to receive the data signal;
a control electrode of the third transistor is configured to receive the light-emitting control signal, a first electrode of the third transistor is configured to receive the first power supply voltage, and a second electrode of the third transistor is connected to the first electrode of the driving transistor; and
the second electrode of the driving transistor is configured to be connected to the light-emitting element.

### Claim 10 (depends on 1)

The display device according to claim 1, further comprising a first scan signal line for transmitting the first scan signal and a second scan signal line for transmitting the second scan signal, wherein
an orthographic projection of the first scan signal line on the base substrate is parallel to an orthographic projection of the second scan signal line on the base substrate.

### Claim 11 (depends on 10)

The display device according to claim 10, wherein
a direction from the first electrode of the driving transistor to the second electrode of the driving transistor is a fourth direction, and
an extension direction of the first scan signal line and an extension direction of the second scan signal line are both parallel to the fourth direction.

### Claim 12 (depends on 10)

The display device according to claim 10, further comprising a first power supply voltage line for transmitting a first power supply voltage and a light-emitting control line for transmitting a light-emitting control signal, wherein
an extension direction of a part of the first power supply voltage line and an extension direction of a part of the light-emitting control line are parallel to the fourth direction, and
the orthographic projection of the first scan signal line on the base substrate, the orthographic projection of the second scan signal line on the base substrate, an orthographic projection of the first power supply voltage line on the base substrate, and an orthographic projection of the light-emitting control line on the base substrate are sequentially arranged in a direction perpendicular to the fourth direction.

### Claim 13 (depends on 12)

The display device according to claim 12, further comprising a second power supply voltage line for transmitting a second power supply voltage, wherein
the first transistor is electrically connected to the second power supply voltage line to receive the second power supply voltage.

### Claim 14 (depends on 13)

The display device according to claim 13, wherein an orthographic projection of the second power supply voltage line on the base substrate is between the orthographic projection of the first power supply voltage line on the base substrate and the orthographic projection of the light-emitting control line on the base substrate, and an extension direction of a part of the second power supply voltage line is parallel to the fourth direction.

### Claim 15 (depends on 12)

The display device according to claim 12, further comprising a first transfer electrode provided at a first side of the light-emitting control line, and a second transfer electrode extending from the first side of the light-emitting control line to a second side of the light-emitting control line, wherein
an orthographic projection of the second transfer electrode on the base substrate crosses the orthographic projection of the light-emitting control line on the base substrate,
two ends of the first transfer electrode are respectively electrically connected to a first electrode of the first transistor and a first electrode of the second transistor,
the first transfer electrode is electrically connected to the second transfer electrode, and
the second transfer electrode is electrically connected to the control electrode of the driving transistor.

### Claim 16 (depends on 15)

The display device according to claim 15, wherein an extension direction of the second transfer electrode is perpendicular to an extension direction of the first transfer electrode, and is perpendicular to the fourth direction.

### Claim 17 (depends on 13)

The display device according to claim 13, wherein
an orthographic projection of a first active region of the first transistor on the base substrate and an orthographic projection of a second active region of the second transistor on the base substrate are both between the orthographic projection of the second scan signal line on the base substrate and the orthographic projection of the light-emitting control line on the base substrate;
the orthographic projection of the first active region of the first transistor on the base substrate intersects with the orthographic projection of the first power supply voltage line on the base substrate, and the orthographic projection of the first active region of the first transistor on the base substrate intersects with the orthographic projection of the second power supply voltage line on the base substrate; and
the orthographic projection of the second active region of the second transistor on the base substrate intersects with the orthographic projection of the first power supply voltage line on the base substrate, and the orthographic projection of the second active region of the second transistor on the base substrate intersects with the orthographic projection of the second power supply voltage line on the base substrate.

### Claim 18

A manufacturing method of a display device, comprising:
forming a pixel circuit on a base substrate, wherein
the pixel circuit comprises a driving transistor, a first transistor, and a second transistor;
the driving transistor comprises a control electrode, a first electrode, and a second electrode, and is configured to control a driving current, flowing through the first electrode of the driving transistor and the second electrode of the driving transistor, for driving a light-emitting element to emit light according to a voltage of the control electrode of the driving transistor;
the first transistor is connected to the control electrode of the driving transistor, and is configured to write a data signal to the control electrode of the driving transistor in response to a first scan signal;
the second transistor is connected to the control electrode of the driving transistor, and is configured to write the data signal to the control electrode of the driving transistor in response to a second scan signal;
the first transistor comprises a first active region, the second transistor comprises a second active region, the driving transistor comprises a fourth active region; and
the pixel circuit further comprises a third transistor, and the third transistor is connected to the first electrode of the driving transistor, and is configured to apply a first power supply voltage to the first electrode of the driving transistor in response to a light-emitting control signal; and the third transistor comprises a third active region, and the manufacturing method further comprises doping the first active region, the second active region, the third active region and the fourth active region so that both of a doping concentration of the first active region and a doping concentration of the second active region are larger than-both a doping concentration of the third active region and a doping concentration of the fourth active region.

### Claim 19 (depends on 18)

The manufacturing method according to claim 18, further comprises:
doping the third active region so that the doping concentration of the fourth active region is smaller than a doping concentration of the third active region.