Temperature sensor and display device including the same

Patent metadata

Field	Value
Publication number	US-11397114-B2
Application number	US-202117213809-A
Country	US
Kind code	B2
Filing date	Mar 26, 2021
Priority date	Sep 22, 2020
Publication date	Jul 26, 2022
Grant date	Jul 26, 2022

Abstract

The temperature sensor includes a first sensor including a sensing element configured to measure a first resistance value of the sensing element in a first state, and also configured to measure a second resistance value of the sensing element in a second state different from the first state, a second sensor configured to measure a touch pressure corresponding to a user's touch input in the second state, a compensator configured to calculate a first change rate based on the first resistance value and the second resistance value, and also configured to calculate a change rate of a correction resistance value by correcting the first change rate based on the touch pressure, and a temperature calculator configured to calculate a temperature value based on the change rate of the correction resistance value.

First claim

What is claimed is:

1. A temperature sensor comprising:
a first sensor including a sensing element, wherein the first sensor is configured to measure a first resistance value of the sensing element in a first state, and wherein the first sensor is configured to measure a second resistance value of the sensing element in a second state different from the first state;
a second sensor configured to measure a touch pressure corresponding to a user's touch input in the second state;
a compensator configured to calculate a first change rate based on the first resistance value and the second resistance value, and wherein the compensator is configured to calculate a change rate of a correction resistance value by correcting the first change rate based on the touch pressure; and
a temperature calculator calculating a temperature value based on the change rate of the correction resistance value.

2. The temperature sensor of claim 1 , wherein the user's touch input is provided to the first sensor in the second state, and the user's touch input is not provided to the first sensor in the first state.

3. The temperature sensor of claim 1 , wherein the compensator calculates the first change rate in correspondence with a ratio of the second resistance value to the first resistance value.

4. The temperature sensor of claim 1 , wherein the compensator calculates a second change rate based on the touch pressure, and calculates the change rate of the correction resistance value based on the first change rate and the second change rate.

5. The temperature sensor of claim 4 , wherein the compensator calculates the change rate of the correction resistance value by subtracting the second change rate from the first change rate.

6. The temperature sensor of claim 4 , wherein the second change rate corresponds to a change rate of the resistance value of the sensing element according to the touch pressure.

7. The temperature sensor of claim 6 , further comprising:
a memory including a look-up table in which the second change rate corresponding to the touch input is stored.

8. The temperature sensor of claim 1 , further comprising:
a memory including a look-up table configured to store the temperature value corresponding to the change rate of the correction resistance value.

9. The temperature sensor of claim 1 , wherein the second sensor is disposed on a surface proximate to a contact surface of the first sensor and the user.

10. The temperature sensor of claim 9 , wherein the first sensor includes:
a first sensor substrate;
the sensing element disposed on the first sensor substrate;
an insulating layer disposed on the first sensor substrate and the sensing element and covering the sensing element; and
first sensor electrodes disposed on the insulating layer that pass through the insulating layer to connect to the sensing element.

11. The temperature sensor of claim 10 , wherein the first sensor electrodes are connected to a measurement circuit that measures the first resistance value and the second resistance value of the sensing element.

12. The temperature sensor of claim 9 , wherein the second sensor includes:
a second sensor substrate;
a third sensor substrate disposed on the second sensor substrate; and
a sensor layer disposed between the second sensor substrate and the third sensor substrate.

13. The temperature sensor of claim 12 , wherein the sensor layer includes:
a second sensor electrode;
a third sensor electrode disposed on the second sensor electrode; and
an intermediate layer disposed between the second sensor electrode and the third sensor electrode.

14. The temperature sensor of claim 1 , wherein the sensing element includes at least one selected from Pt, Ni, Cu, or polysilicon.

15. A display device comprising:
a touch sensing unit configured to sense a user's touch input;
a display panel disposed on the touch sensing unit, including a display area and a non-display area, and wherein the display panel is configured to display an image in the display area; and
a temperature sensor configured to calculate a temperature value in correspondence with the user's touch input,
wherein the temperature sensor includes:
a first sensor including a sensing element, wherein the first sensor is configured to measure a first resistance value of the sensing element in a first state, and wherein the first sensor is configured to measure a second resistance value of the sensing element in a second state different from the first state;
a second sensor configured to measure a touch pressure corresponding to the touch input in the second state;
a compensator configured to calculate a first change rate based on the first resistance value and the second resistance value, and wherein the compensator is configured to calculate a change rate of a correction resistance value by correcting the first change rate based on the touch pressure; and
a temperature calculator calculating a temperature value based on the change rate of the correction resistance value.

16. The display device of claim 15 , wherein the temperature sensor overlaps the non-display area.

17. The display device of claim 16 , wherein the touch sensing unit overlaps the display area and the non-display area,
the touch sensing unit overlapping the non-display area corresponds to the second sensor, and
the first sensor overlaps the second sensor.

18. The display device of claim 15 , wherein the temperature sensor overlaps the display area.

19. The display device of claim 18 , wherein the touch sensing unit overlaps the display area,
the touch sensing unit overlapping the display area corresponds to the second sensor, and
the first sensor overlaps the second sensor.

20. The display device of claim 19 , wherein the display panel includes pixels disposed on the display area, and
wherein the first sensor does not overlap the pixels.

Assignees

• Samsung Display Co Ltd

Inventors

• Hong Won Ki

Classifications

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/0418

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• G01K13/20 Primary

  Clinical contact thermometers for use with humans or animals · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G01K7/183 Primary

  characterised by the use of the resistive element · CPC title