Display device including conductive layer and touch sensors configured to receive the same signal

• US 9,519,387 B2
• Filed: 03/21/2014
• Issued: 12/13/2016
• Est. Priority Date: 10/04/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Park, Jin Woo, Song, Dae Ho, Kim, Chul, Kwon, Ho Kyoon, Cha, Ki Seok
• Primary Examiner(s): Sternbane, Larry
• Assistant Examiner(s): Azari, Sepehr
• Application Number:
  US14/222,339
• Publication Number:
  US 20150097802A1
• Time in Patent Office: 998 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality

Abstract

A display device includes a display panel, a signal controller, sensing signal lines, and a touch sensor controller. The display panel includes pixels configured to display images, and touch sensor electrodes configured to sense a touch event. The touch sensor electrodes overlap a conductive layer. The signal controller is configured to generate signals to control the display of the images via the display panel. The sensing signal lines are respectively connected to the touch sensor electrodes. The touch sensor controller is configured to transmit a sensing input signal via the sensing signal lines, receive a sensing output signal via the sensing signal lines, and generate touch information based on reception of the sensing output signal. The touch sensor controller is configured to apply the same signal to the touch sensor electrodes and the conductive layer.

Claims

1. A display device, comprising:

a display panel comprising;

pixels configured to display images; and

touch sensor electrodes configured to sense a touch event, the touch sensor electrodes overlapping a common electrode disposed in a different layer than the touch sensor electrodes, the touch sensor electrodes being spaced apart from the common electrode without any contact between the touch sensor electrodes and the common electrode, the common electrode being configured to apply a common voltage to the pixels;

a signal controller configured to generate signals to control the display of the images via the display panel;

sensing signal lines respectively connected to the touch sensor electrodes; and

a touch sensor controller configured to;

transmit a sensing input signal via the sensing signal lines;

receive a sensing output signal via the sensing signals lines; and

generate touch information based on reception of the sensing output signal,

wherein the touch sensor controller is configured to apply the same signal to the touch sensor electrodes and the common electrode,

wherein the display panel further comprises;

a lower panel; and

an upper panel disposed on the lower panel, the touch sensor electrodes being configured to sense the touch event on a surface of the upper panel; and

wherein the lower panel comprises;

the common electrode;

an insulating layer disposed on the common electrode; and

a touch sensor layer comprising the touch sensor electrodes, the touch sensor layer being disposed on the insulating layer, the insulating layer being disposed between the common electrode and the touch sensor layer.

2. The display device of claim 1, wherein:

the touch sensor controller is further configured to generate a sensing scanning signal; and

the same signal is a combined signal of the sensing scanning signal and the common voltage.

3. The display device claim 1, wherein:

the common electrode comprises a first pattern;

the touch sensor layer comprises a second pattern; and

the first pattern and the second pattern are substantially the same as one another and substantially overlap one another.

4. The display device of claim 3, wherein:

the first pattern and the second pattern correspond to cutouts; and

the cutouts are formed in respective areas of the pixels.

5. The display device of claim 4, wherein the sensing signal lines are disposed between adjacent cutouts.

6. The display device of claim 1, wherein the touch sensor controller is further configured to:

receive a synchronization signal from the signal controller;

generate a scanning enable signal based on the synchronization signal; and

generate a sensing scanning signal based on the scanning enable signal.

7. The display device of claim 6, wherein:

the synchronization signal is a clock pulse vertical signal and an output enable signal; and

the touch sensor controller is configured to generate the scanning enable signal using an XNOR gate.

8. The display device of claim 7, wherein the touch sensor controller comprises:

timing generator configured to generate the scanning enable signal based on the synchronization signal received from the signal controller;

a signal generate/processing unit configured to;

generate the sensing scanning signal based on the scanning enable signal; and

process the sensing output signal;

a signal transmitting/receiving unit configured to;

transmit the sensing output signal; and

receive the sensing output signal; and

a multiplexer configured to;

selectively transfer the sensing input signal to the sensing signal lines; and

receive the sensing output signal.

9. The display device of claim 8, wherein:

the start pulse vertical signal comprises a display active period and a vertical blanking period; and

the signal transmitting/receiving unit is configured to transmit the sensing scanning signal during one or more horizontal blanking periods of the display active period and during the vertical blanking period.

10. The display device of claim 8, wherein a high period of the scanning enable signal is disposed between a falling edge of the clock pulse vertical signal and a rising edge of the output enable signal.

11. The display device of claim 10, wherein the duration of the high period is at least 20 to 30 μ

s.

12. The display device of claim 6, wherein the touch sensor controller is configured to generate the touch information when:

an amplitude of the sensing output signal is less than the amplitude of the sensing scanning signal; and

the absolute difference between the amplitude of the sensing output signal and the amplitude of the sensing scanning signal is larger than a threshold value.

13. The display device of claim 1, wherein the touch sensor controller is disposed on a flexible printed circuit board, a glass substrate, or a printed circuit boar.