Sensor device and display device including the same

Patent metadata

Field	Value
Publication number	US-12373064-B2
Application number	US-202318367481-A
Country	US
Kind code	B2
Filing date	Sep 13, 2023
Priority date	Mar 17, 2023
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

A sensor device includes: a sensor panel including sensors arranged in a matrix, and sensor lines electrically connected to the sensors on a one-to-one basis; and a sensor driver configured to receive, using a reference signal having at least two or more duty cycles, sensing signals from the sensors through the sensor lines.

First claim

What is claimed is:

1. A sensor device comprising:
a sensor panel including sensors arranged in a matrix, and sensor lines electrically connected to each of the sensors, which is formed in a self-capacitance sensing manner, on a one-to-one basis; and
a sensor driver configured to receive, using a reference signal having at least two or more duty cycles, sensing signals from the sensors through the sensor lines, the reference signal including a first reference signal and a second reference signal,
wherein each of the sensors forms a self-capacitance with an electrode disposed in a display panel, and
wherein sensors arranged on a first row receive the first reference signal having a first duty cycle during a first sensing frame period, and the sensors arranged on the first row receive the second reference signal having a second duty cycle, which is different from the first duty cycle, during a second sensing frame period.

2. The sensor device according to claim 1 ,
wherein the first reference signal having the first duty cycle and the second reference signal having the second duty cycle are square waves, and are set to have an identical period and an identical frequency.

3. The sensor device according to claim 1 , wherein the sensor driver receives the sensing signals from the sensors on a row basis.

4. The sensor device according to claim 1 , wherein the sensor driver receives the sensing signals using the reference signal having different duty cycles on at least one sensing frame basis.

5. The sensor device according to claim 4 , wherein the sensor driver receives the sensing signals using the first reference signal having the first duty cycle during the first sensing frame period, and receives the sensing signals using the second reference signal having the second duty cycle during the second sensing frame period.

6. The sensor device according to claim 4 ,
wherein the sensor driver applies a shield signal to adjacent sensors located on a row adjacent to a row from which the sensing signals are received, and
wherein the shield signal has same waveform and phase as the reference signal supplied to the row from which the sensing signals are received.

7. The sensor device according to claim 1 ,
wherein, during the first sensing frame period, sensors arranged on the first row receive the first reference signal having the first duty cycle, and sensors arranged on a second row receive the second reference signal having the second duty cycle, and
wherein, during the second sensing frame period, the sensors arranged on the first row receive the second reference signal having the second duty cycle, and the sensors arranged on the second row receive the first reference signal having the first duty cycle.

8. The sensor device according to claim 7 ,
wherein the sensor driver applies a shield signal to adjacent sensors located on a row adjacent to a row from which the sensing signals are received, and
wherein the shield signal has same waveform and phase as the reference signal supplied to the row from which the sensing signals are received.

9. The sensor device according to claim 7 , wherein, during the first sensing frame period,
the sensing signals are received from the sensors located on an odd-numbered row, using the first reference signal having the first duty cycle, and
the sensing signals are received from the sensors located on an even-numbered row, using the second reference signal having the second duty cycle different from the first duty cycle.

10. The sensor device according to claim 9 , wherein, during the second sensing frame period,
the sensing signals are received from the sensors located on the odd-numbered row, using the second reference signal having the second duty cycle, and
the sensing signals are received from the sensors located on the even-numbered row, using the first reference signal having the first duty cycle.

11. The sensor device according to claim 1 ,
wherein the sensor panel includes a first area and a second area, and
wherein the sensor driver receives the sensing signals from the sensors in the first area and the second area, using reference signals having different duty cycles.

12. The sensor device according to claim 11 , wherein the first area and the second area are defined by specific columns.

13. The sensor device according to claim 1 , wherein the sensor driver comprises:
an amplifier including a first input terminal electrically connected to one sensor line among the sensor line, a second input terminal to which the reference signal is to be applied, and an output terminal; and
a capacitor and a switch electrically connected in parallel between the first input terminal and the output terminal of the amplifier, and
wherein a sensing signal corresponding to the reference signal is generated on the one sensor line among the sensor lines.

14. A display device, comprising:
a display panel configured to display an image;
a sensor panel disposed on the display panel, the sensor panel including sensors arranged in a matrix having at least two rows and at least two columns, and sensor lines electrically connected to the sensors on a one-to-one basis; and
a sensor driver configured to receive, using a reference signal having at least two or more duty cycles, sensing signals from the sensors through the sensor lines, the reference signal including a first reference signal and a second reference signal,
wherein sensors arranged on a first row receive the first reference signal having a first duty cycle during a first sensing frame period, and the sensors arranged on the first row receive the second reference signal having a second duty cycle, which is different from the first duty cycle, during a second sensing frame period.

15. The display device according to claim 14 ,
wherein the first reference signal having the first duty cycle and the second reference signal having the second duty cycle are square waves, and are set to have an identical period and an identical frequency.

16. The display device according to claim 15 ,
wherein the sensor driver receives the sensing signals using the first reference signal having the first duty cycle during the first sensing frame period, and
wherein the sensor driver receives the sensing signals using the second reference signal having the second duty cycle during the second sensing frame period.

17. The display device according to claim 15 , wherein, during the first sensing frame period, the sensor driver receives the sensing signals from the sensors located on the first row using the first reference signal having the first duty cycle, and receives the sensing signals from the sensors located on a second row using the second reference signal having the second duty cycle.

18. The display device according to claim 17 , wherein, during the second sensing frame period, the sensor driver receives the sensing signals from the sensors located on the first row, using the second reference signal having the second duty cycle, and receives the sensing signals from the sensors located on the second row, using the first reference signal having the first duty cycle.

19. The display device according to claim 15 ,
wherein the sensor driver applies a shield signal to adjacent sensors located on a row adjacent to a row from which the sensing signals are received, and
wherein the shield signal has same waveform and phase as the reference signal.

20. The display device according to claim 15 ,
wherein the sensor panel is divided into a

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Jin Woo
• Ku Ja Seung
• Son Jung Ha
• Lee Dong Chun
• Hong Jin Taek

Classifications

• G06F3/04166 Primary

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · CPC title

• G06F2203/04107

  Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds · CPC title

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title

• H03F3/00

  Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements · CPC title

• G06F3/0443

  using a single layer of sensing electrodes · CPC title