DISPLAY DEVICE INCLUDING TOUCH SENSOR

• US 20180067591A1
• Filed: 10/31/2017
• Published: 03/08/2018
• Est. Priority Date: 01/08/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Samsung Display Company Limited (Samsung Group)
• Inventors: LEE, Il Ho, LEE, Seung-Hee, PYOUN, Seoung Bum, KIM, Young-Jin
• Granted Patent: US 10,394,407 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/041662 using alternate mutual and self-capacitive scanning
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 5/003 Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto specific for a CRT G09G1/165; for a flat panel G09G3/2092

Abstract

A display device includes a display panel including pixels, an active area on which an image is configured to be displayed, and a black matrix area on which an image is not configured to be displayed, touch sensor electrodes configured to detect a touch of an external object, the touch sensor electrodes disposed in the active area, and detection input electrodes configured to generate mutual capacitance with the touch sensor electrodes, the detection input electrodes disposed in an edge area of the display panel that overlaps the black matrix area.

Claims

1. A display device, comprising:

a display panel comprising;

an active area on which a plurality of pixels configured to display an image is disposed; and

a non-display area around the active area;

touch sensor electrodes configured to detect a touch of an external object, the touch sensor electrodes disposed in the active area; and

detection input electrodes configured to generate mutual capacitance with the touch sensor electrodes, the detection input electrodes disposed in an edge area of the display panel that overlaps the non-display area.

2. The display device of claim 1, wherein the touch sensor electrode is configured to detect the touch of the external object by at least one of a self-capacitance type and a mutual-capacitance type.

3. The display device of claim 2, further comprising:

a detection scan driver connected to the display panel;

detection input signal lines electrically connected to the touch sensor electrodes and the detection input electrodes, the detection input signal lines configured to receive a detection input signal from the detection scan driver and transmit the received detection input signal to the touch sensor electrodes and the detection input electrodes;

a detection signal processor connected to the display panel; and

detection output signal lines electrically connected to the touch sensor electrodes,

wherein the detection output signal lines are configured to receive detection output signals from the touch sensor electrodes and transmit the received detection output signals to the detection signal processor.

4. The display device of claim 3, wherein the touch sensor electrodes are configured to:

transmit a first detection output signal generated by the self-capacitance type to the detection signal processor through a first detection output signal line; and

transmit a second detection output signal generated by the mutual-capacitance type to the detection signal processor through a second detection output signal line.

5. The display device of claim 3, wherein the detection signal processor is configured to extract touch coordinates by using at least one of a first detection output signal generated by the touch sensor electrode by the self-capacitance type and a second detection output signal generated by the touch sensor electrode by the mutual-capacitance type.

6. The display device of claim 5, wherein the detection signal processor is configured to extract the touch coordinates by combining the first detection output signal and the second detection output signal.

7. The display device of claim 6, wherein the detection signal processor is configured to:

calculate an average value of a value of the first detection output signal and a value of the second detection output signal;

combine the first and second detection output signals for each position of the touch sensor electrode; and

extract the touch coordinates by performing interpolation on the combined signal based on the average value.

8. The display device of claim 6, wherein the detection signal processor is configured to:

extract first touch coordinates by performing interpolation on the first detection output signal;

extract second touch coordinates by performing the interpolation on the second detection output signal; and

extract the touch coordinates based on an average value of the first touch coordinates and the second touch coordinates.

9. The display device of claim 2, further comprising:

a touch sensor controller connected to the display panel; and

detection signal lines electrically connected to the touch sensor electrodes and the detection input electrodes,

wherein the detection signal lines are configured to;

receive a detection input signal from the touch sensor controller and transmit the received detection input signal to the touch sensor electrodes and the detection input electrodes; and

receive detection output signals from the touch sensor electrodes and transmit the received detection output signal to the touch sensor controller.

10. The display device of claim 9, wherein the touch sensor electrode is configured to:

transmit a first detection output signal generated by the self-capacitance type to the touch sensor controller through a first detection signal line; and

transmit a second detection output signal generated by the mutual-capacitance type to the touch sensor controller through a second detection signal line.

11. The display device of claim 1, wherein:

the display panel comprises;

a first substrate and a second substrate facing the first substrate;

touch sensor layers on which the touch sensor electrodes are disposed; and

a common electrode disposed on the second substrate with an insulating layer interposed therebetween;

the touch sensor electrode is configured to detect a touch of an object on an upper surface of the second substrate; and

the detection input electrodes are disposed on the second substrate.

12. The display device of claim 1, wherein:

the display panel comprises;

a first substrate and a second substrate;

a static electricity preventing layer disposed on an upper surface of the second substrate; and

touch sensor layers on which the touch sensor electrodes are disposed; and

the detection input electrodes are disposed on the static electricity preventing layer with an adhesive layer interposed therebetween.

13. The display device of claim 1, wherein:

the display panel comprises a first substrate, a second substrate, a static electricity preventing layer disposed on an upper surface of the second substrate, and touch sensor layers on which the touch sensor electrodes are disposed; and

the detection input electrodes are disposed on the static electricity preventing layer with a passivation layer interposed therebetween.

14. The display device of claim 1, wherein:

the display panel comprises a first substrate, a second substrate, a static electricity preventing layer disposed on an upper surface of the second substrate; and

the touch sensor electrodes and the detection input electrodes are disposed on the static electricity preventing layer.

15. The display device of claim 1, wherein the display panel comprises a first substrate, a second substrate, touch sensor layers on which the touch sensor electrodes are disposed, and the detection input electrodes.

16. The display device of claim 15, wherein detection signal lines disposed on the touch sensor layers are connected to the first substrate through conductive dots.

17. A method of detecting a touch in a display device, the method comprising:

obtaining a first detection output signal generated by a self-capacitance type from touch sensor electrodes;

obtaining a second detection output signal generated by a mutual-capacitance type from the touch sensor electrodes; and

extracting touch coordinates by combining the first detection output signal and the second detection output signal,

wherein the extracting of the touch coordinates comprises;

calculating an average value of a value of the first detection output signal and a value of the second detection output signal;

combining the first and second detection output signals for each position of the touch sensor electrodes; and

extracting the touch coordinates by performing interpolation on the combined signal based on the average value.

18. A method of detecting a touch in a display device, the method comprising:

obtaining a first detection output signal generated by a self-capacitance type from touch sensor electrodes;

obtaining a second detection output signal generated by a mutual-capacitance type from the touch sensor electrodes; and

extracting touch coordinates by combining the first detection output signal and the second detection output signal,

wherein the extracting of the touch coordinates comprises;

extracting first touch coordinates by performing interpolation on the first detection output signal;

extracting second touch coordinates by performing the interpolation on the second detection output signal; and

extracting the touch coordinates based on an average value of the first touch coordinates and the second touch coordinates.