Touch device configured to correct touch data and display including the same

• US 10,025,417 B2
• Filed: 10/23/2015
• Issued: 07/17/2018
• Est. Priority Date: 03/16/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Shin, Ji Hye
• Primary Examiner(s): Snyder, Adam J
• Application Number:
  US14/922,064
• Publication Number:
  US 20160274720A1
• Time in Patent Office: 998 Days
• Field of Search: 345173, 178 1802
• CPC Class Codes: G06F 2203/04102 Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures

Abstract

An exemplary embodiment provides a touch device including: a touch panel including: first and second substrates; and a pressure sensor including: a first electrode disposed on the first substrate; a second electrode disposed on the second substrate; an insulating layer disposed between the first and second electrodes; and a spacer, wherein the pressure sensor is configured to transmit a touch signal corresponding to an intensity of pressure applied to the second substrate through the pressure sensor in response to a touch; and a touch controller configured to: acquire touch data at respective nodes from the touch signal; acquire a touch data variation at the respective nodes based on previous touch data and the touch data at the respective nodes; correct the touch data at the respective nodes based on the touch data variation; and acquire a coordinate of the touch location based on the corrected touch data.

Claims

1. A touch device comprising:

a touch panel comprising;

a first substrate and a second substrate; and

a pressure sensor, the pressure sensor comprising;

a first electrode disposed on the first substrate;

a second electrode disposed on the second substrate;

an insulating layer disposed between the first electrode and the second electrode; and

a spacer,

wherein the pressure sensor is configured to transmit a touch signal corresponding to an intensity of pressure applied to the second substrate through the pressure sensor in response to a touch; and

a touch controller configured to;

acquire touch data at respective nodes from the touch signal;

acquire a touch data variation at the respective nodes based on previous touch data and the touch data at the respective nodes;

correct the touch data at the respective nodes based on the touch data variation; and

acquire a coordinate of a touch location of the touch based on the corrected touch data,

wherein the touch controller is configured to;

recognize nodes in a restoring state based on the touch data variation; and

correct the touch data of the nodes recognized as in the restoring state with a correction parameter, the correction parameter corresponding to the touch data variation of the respective nodes,

wherein the restoring state is a state of the spacer recovering to an original shape after a touch release.

2. The touch device of claim 1, wherein the touch controller is further configured to recognize a node in the restoring state by recognizing the node having the touch data variation within a predetermined range.

3. The touch device of claim 1, wherein the correction parameter corresponds to a touch released state of the respective nodes.

4. The touch device of claim 1, wherein the touch controller configured to acquire the touch data from a difference in signal intensity between the touch signal and a predetermined baseline signal.

5. The touch device of claim 1, wherein the touch controller is configured to calculate noise from the touch data in response to detecting that a number of the nodes having the touch data greater than a predetermined value is greater than a predetermined number.

6. The touch device of claim 5, wherein the touch controller is configured to update the correction parameter based on the noise in response to detecting that the noise is greater than a predetermined threshold value.

7. The touch device of claim 1, wherein the spacer is made of an elastic material.

8. The touch device of claim 1, wherein the second substrate is a flexible substrate.

9. The touch device of claim 8, wherein the first substrate is more rigid compared to the second substrate.

10. A display device, comprising:

a touch device comprising;

a touch panel comprising;

a first substrate and a second substrate; and

a pressure sensor, the pressure sensor comprising;

a first electrode disposed on the first substrate;

a second electrode disposed on the second substrate;

an insulating layer disposed between the first electrode and the second electrode; and

a spacer,

wherein the pressure sensor is configured to transmit a touch signal corresponding to an intensity of pressure applied to the second substrate through the pressure sensor in response to a touch; and

a touch controller configured to;

acquire touch data at respective nodes from the touch signal;

acquire a touch data variation at the respective nodes based on previous touch data and the touch data at the respective nodes;

recognize nodes in a restoring state based on the touch data variation;

correct the touch data of the nodes recognized as in the restoring state with a correction parameter, the correction parameter corresponding to based on the touch data variation of the respective nodes,

wherein the restoring state is a state of the spacer recovering to an original shape after a touch release.

11. The display device of claim 10, further comprising

a display panel including an upper substrate and a lower substrate, and a light-emitting device and a driving circuit disposed between the upper substrate and the lower substrate and configuring a plurality of pixels,

wherein the lower substrate is used as the second substrate.

12. A method of operating touch device comprising a touch panel comprising a pressure sensor configured to detect a touch, the method comprising:

acquiring touch data at respective nodes from touch signal transmitted from the pressure sensor;

acquiring a touch data variation at the respective nodes based on previous touch data and the touch data at the respective nodes;

correcting the touch data at the respective nodes based on the touch data variation;

acquiring a coordinate of a touch location of the touch based on the corrected touch data;

recognizing nodes in a restoring state based on the touch data variation; and

correcting the touch data of the nodes recognized as in the restoring state with a correction parameter, the correction parameter corresponding to the touch data variation of the respective nodes,

wherein the pressure sensor comprises a first electrode, a second electrode, an insulating layer disposed between the first electrode and the second electrode, and a spacer, and

wherein the restoring state is a state of the spacer recovering to an original shape after a touch release.

13. The method of claim 12, further comprising:

recognizing a node in the restoring state by recognizing the node having the touch data variation within a predetermined range.

14. The method of claim 12, further comprising:

acquiring the touch data from a difference in signal intensity between the touch signal and a predetermined baseline signal.

15. The method of claim 12, further comprising:

calculating noise from the touch data in response to detecting that a number of the nodes having the touch data greater than a predetermined value is greater than a predetermined number.

16. The method of claim 15, further comprising:

updating the correction parameter based on the noise in response to detecting that the noise is greater than a predetermined threshold value.