Sensor and display device including the same

Patent metadata

Field	Value
Publication number	US-12451082-B2
Application number	US-202418604293-A
Country	US
Kind code	B2
Filing date	Mar 13, 2024
Priority date	Mar 30, 2023
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

Disclosed is a sensor of a display device including a light-sensing element connected to a first sensing node, a first transistor connected between a reset voltage line and the first sensing node, a second transistor connected between a sensor-driving voltage line and a second sensing node, and including a gate electrode connected to the first sensing node, a third transistor connected between the second sensing node and a readout line, and including a gate electrode connected to a scan line, and a compensation capacitor connected between the gate electrode of the second transistor and the scan line.

First claim

What is claimed is:

1. A sensor of a display comprising:
a light-sensing element connected between a bias voltage line, which is configured to provide a bias voltage, and a first sensing node;
a first transistor connected between a reset voltage line, which is configured to provide a reset voltage that has a level that is lower than a level of the bias voltage, and the first sensing node;
a second transistor connected between a sensor-driving voltage line, which is configured to provide a sensor-driving voltage that is different from the reset voltage, and a second sensing node, and comprising a gate electrode connected to the first sensing node;
a third transistor connected between the second sensing node and a readout line, and comprising a gate electrode connected to a scan line of the display; and
a compensation capacitor connected between the gate electrode of the second transistor and the scan line.

2. The sensor of claim 1 , further comprising an upper electrode above the gate electrode of the second transistor, and electrically connected to the scan line through a contact hole,
wherein the compensation capacitor comprises the gate electrode of the second transistor and the upper electrode.

3. The sensor of claim 2 , wherein a part of the upper electrode overlaps the gate electrode of the second transistor, and another part of the upper electrode overlaps the scan line.

4. The sensor of claim 2 , wherein the scan line comprises a same material as, and is at a same layer as, the gate electrode of the second transistor.

5. The sensor of claim 1 , wherein the first transistor comprises a first type, and
wherein the second transistor and the third transistor comprise a second type that is different from the first type.

6. A display device comprising:
a pixel comprising a light-emitting element;
a sensor comprising a light-sensing element connected to a bias voltage line, which is configured to provide a bias voltage, and a sensor-driving circuit connected to the light-sensing element through a first sensing node; and
a readout circuit configured to receive a sensing signal from the sensor,
wherein the sensor-driving circuit of the sensor comprises:
a first transistor connected between a reset voltage line, which is configured to provide a reset voltage that has a level that is lower than a level of the bias voltage, and the first sensing node;
a second transistor connected between a sensor-driving voltage line, which is configured to provide a sensor-driving voltage that is different from the reset voltage, and a second sensing node, and comprising a gate electrode connected to the first sensing node;
a third transistor connected between the second sensing node and a readout line, and comprising a gate electrode connected to a scan line; and
a compensation capacitor connected between the gate electrode of the second transistor and the scan line.

7. The display device of claim 6 , further comprising an upper electrode above the gate electrode of the second transistor, and electrically connected to the scan line through a contact hole,
wherein the compensation capacitor comprises the gate electrode of the second transistor and the upper electrode.

8. The display device of claim 7 , wherein a part of the upper electrode overlaps the gate electrode of the second transistor, and another part of the upper electrode overlaps the scan line.

9. The display device of claim 7 , wherein the scan line comprises a same material as, and is at a same layer as, the gate electrode of the second transistor.

10. The display device of claim 6 , wherein the first transistor comprises a first type, and
wherein the second transistor and the third transistor comprise a second type that is different from the first type.

11. The display device of claim 10 , further comprising:
a first pixel transistor comprising a first electrode, a second electrode connected to the light-emitting element, and a gate electrode;
a second pixel transistor connected between a data line and the first electrode of the first pixel transistor, and comprising a gate electrode connected to the scan line; and
a third pixel transistor connected between the second electrode of the first pixel transistor and the gate electrode of the first pixel transistor, and comprising a gate electrode connected to a compensation scan line.

12. The display device of claim 11 , wherein the first pixel transistor and the second pixel transistor comprise the second type, and
wherein the third pixel transistor comprises the first type.

13. The display device of claim 6 , further comprising a scan-and- sensor driver configured to provide a scan signal to the scan line.

14. A display device comprising:
a base layer;
a circuit layer above the base layer; and
an element layer above the circuit layer, and comprising a light-emitting element and a light-sensing element, wherein the light-sensing element is connected to a bias voltage line, which is configured to provide a bias voltage,
wherein the circuit layer comprises:
a first transistor connected to the light-sensing element through a first sensing node, and configured to receive a reset voltage that has a level that is lower than a level of the bias voltage;
a second transistor connected between a sensor-driving voltage line, which is configured to provide a sensor-driving voltage that is different from the reset voltage, and a second sensing node, and comprising a gate electrode connected to the first sensing node;
a third transistor connected between the second sensing node and a readout line, and comprising a gate electrode connected to a scan line; and
an upper electrode above the gate electrode of the second transistor and electrically connected to the scan line through a contact hole, and

wherein a compensation capacitor comprises the gate electrode of the second transistor and the upper electrode, and
wherein the scan line comprises a same material as, and is at a same layer as, the gate electrode of the second transistor.

15. The display device of claim 14 , wherein a part of the upper electrode overlaps the gate electrode, and another part of the upper electrode overlaps the scan line.

16. The display device of claim 14 , wherein the first transistor comprises a first type, and
wherein the second transistor and the third transistor comprise a second type that is different from the first type.

17. The display device of claim 14 , wherein the circuit layer further comprises:
a first pixel transistor comprising a first electrode, a second electrode connected to the light-emitting element, and a gate electrode;
a second pixel transistor connected between a data line and the first electrode of the first pixel transistor, and comprising a gate electrode connected to the scan line; and
a third pixel transistor connected between the second electrode of the first pixel transistor and the gate electrode of the first pixel transistor, and comprising a gate electrode connected to a compensation scan line.

18. A sensor of a display comprising:
a light-sensing element connected to a first sensing node;
a first transistor connected between a reset voltage line, which is configured to provide a reset voltage, and the first sensing node;
a second transistor connected between a sensor-driving voltage line, which is configured to provide a sensor-driving voltage that is different from the reset voltage, and a second sensing node, and comprising a gate electrode connected to the first sensing node, and a body electrode electrically c

Assignees

• Samsung Display Co Ltd

Inventors

• No Sang Yong
• Son Sunkwun
• Shin Dong Hee

Classifications

• H10K59/40 Primary

  OLEDs integrated with touch screens · CPC title

• G09G2310/0267

  Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays · CPC title

• G06F3/0421

  by interrupting or reflecting a light beam, e.g. optical touch-screen · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G3/32

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title