Touch screen device including a controller to adjust a sensing parameter based on accumulative folding, display device having the same, and method of driving the same

• US 10,642,415 B2
• Filed: 02/27/2019
• Issued: 05/05/2020
• Est. Priority Date: 11/27/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Jung, Chan-Sung
• Primary Examiner(s): Ritchie, Darlene M
• Application Number:
  US16/286,768
• Publication Number:
  US 20190187858A1
• Time in Patent Office: 433 Days
• CPC Class Codes: G06F 1/1652 the display being flexible, e.g. mimicking a sheet of paper, or rollable
• 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 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 77/111 Flexible substrates

Abstract

A touch screen device includes a touch panel, a touch driver, a touch sensing driver, and a controller. The touch panel includes a plurality of driving lines extending in a first, direction and a plurality of sensing lines extending in a second direction. The touch driver outputs a driving signal to the driving lines. The touch sensing driver receives a sensing signal from the sensing lines. The controller determines a sensing parameter corresponding to an accumulative folding number of the touch panel and controls the touch driver and the touch sensing driver based on the sensing parameter.

Claims

1. A touch screen device, comprising:

a touch panel including a plurality of first signal lines extending in a first direction and a plurality of second signal lines extending in a second direction crossing the first direction;

a touch sensing driver configured to detect a change in capacitance between the first and second signal lines; and

a controller to determine a sensing parameter corresponding to an accumulative folding number of the touch panel, the accumulative folding number corresponding to the number of times the touch panel is folded, and to control at least one signal of the touch sensing driver based on the sensing parameter,

wherein the controller calculates a resistance change value based on the accumulative folding number of the touch panel, derives the sensing parameter corresponding to the resistance change value, and generates a control signal for controlling the touch sensing driver based on the sensing parameter.

2. The touch screen device as claimed in claim 1, wherein the sensing parameter includes at least one selected from a converting gain value of at least one of sensing signals, and a touch threshold value of at least one of the sensing signals.

3. The touch screen device as claimed in claim 1, further comprising one or more folding sensors to sense a folding state of the touch panel.

4. The touch screen device as claimed in claim 3, wherein:

the touch panel is folded along at least one folding line, and

the folding sensors are symmetrically disposed relative to the folding line.

5. The touch screen device as claimed in claim 3, wherein the folding sensor is an acceleration sensor to measure a folding angle of the touch panel.

6. A display device, comprising:

a display panel including a plurality of pixels;

a touch panel bonded to one side of the display panel, the touch panel including a plurality of first signal lines extending in a first direction and a plurality of second signal lines extending in a second direction crossing the first direction;

a scan driver to provide a scan signal to the pixels;

a data driver to provide a data signal to the pixels;

a touch sensing driver configured to detect a change in capacitance between the first and second signal lines; and

a controller to determine a sensing parameter corresponding to an accumulative folding number of the touch panel, the accumulative folding number corresponding to the number of times the touch panel is folded, and to control at least one signal of the touch sensing driver based on the sensing parameter,

wherein the controller calculates a resistance change value based on the accumulative folding number of the touch panel, derives the sensing parameter corresponding to the resistance change value, and generates a control signal for controlling the touch sensing driver based on the sensing parameter.

7. The display device as claimed in claim 6, wherein the sensing parameter includes at least one selected from a converting gain value of at least one of sensing signals, and a touch threshold value of at least one of the sensing signals.

8. A method for driving a touch screen device folded in at least one folding line, the method comprising:

calculating a resistance change value based on an accumulative folding number of a touch panel, the accumulative folding number corresponding to the number of times the touch panel is folded;

determining a sensing parameter corresponding to the resistance change value; and

generating a control signal to control at least one signal of a touch sensing driver receiving a sensing signal for sensing a touch of the touch panel based on the sensing parameter,

wherein the sensing parameter includes at least one selected from a converting gain value of the sensing signal and a touch threshold value of the sensing signal.

9. The method as claimed in claim 8, further comprising:

determining the sensing parameter using a look-up table (LUT),

wherein the LUT indicates a relationship between the resistance change value and the sensing parameter.

10. The method as claimed in claim 8, further comprising periodically updating the sensing parameter.