US-20260126871-A1 - DISPLAY DEVICE AND TOUCH SYSTEM INCLUDING THE SAME

US20260126871A1US 20260126871 A1US20260126871 A1US 20260126871A1US-20260126871-A1

Abstract

A display device includes a touch panel that includes first dummy electrodes that extends in a first direction and are connected to each other, second dummy electrodes that extend in a second direction that crosses the first direction and are connected to each other, a first sensing electrode disposed between the first dummy electrodes and that electrically floats with the first dummy electrodes, and a second sensing electrode disposed between the second dummy electrodes and that electrically floats with the second dummy electrodes; and a touch panel driver that drives the touch panel.

Inventors

Won Sang Park

Assignees

SAMSUNG DISPLAY CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20251203
Priority Date: 20231127

Claims (10)

1 . A touch system, comprising: a display device; and an input device that generates an eddy current in the display device, wherein the display device includes a touch panel that includes first dummy electrodes that extend in a first direction and are connected to each other, second dummy electrodes that extend in a second direction that crosses the first direction and are connected to each other, a first sensing electrode disposed between the first dummy electrodes and that electrically floats with the first dummy electrodes, and a second sensing electrode disposed between the second dummy electrodes and that electrically floats with the second dummy electrodes; and a touch panel driver that drives the touch panel.
2 . The touch system of claim 1 , wherein the input device includes an input device driving portion that generates a magnetic field generation signal; a power supply portion that provides power to the input device driving portion; and a magnetic field generation portion that generates a magnetic field that corresponds to the magnetic field generation signal.
3 . The touch system of claim 2 , wherein the input device driving portion generates the magnetic field generation signal based on a pressure of the input device.
4 . The touch system of claim 3 , wherein the input device further includes a pressure measurement portion that measures the pressure of the input device.
5 . The touch system of claim 3 , wherein the input device provides the pressure of the input device to the display device.
6 . The touch system of claim 2 , wherein the input device indicates to the display device whether power is provided to the input device driving portion.
7 . The touch system of claim 2 , wherein the input device further includes a wireless communication portion that performs wireless communication.
8 . The touch system of claim 2 , wherein a touch period during which coordinates of the input device are detected includes a first sub-touch period and a second sub-touch period, and the touch panel driver transmits an in-touch signal to the first sensing electrode in the first sub-touch period, receives a (2-1)-th touch sensing signal from the first sensing electrode in the second sub-touch period, receives a (2-2)-th touch sensing signal from the second sensing electrode in the second sub-touch period, and detects coordinates of the input device based on the (2-1)-th touch sensing signal and the (2-2)-th touch sensing signal.
9 . The touch system of claim 8 , wherein the input device includes a receiving portion that receives a signal that corresponds to the in-touch signal; a transmitting portion that transmits the magnetic field generation signal to the magnetic field generation portion; and a switch portion that selectively connects the input device driving portion to the receiving portion or the transmitting portion.
10 . The touch system of claim 9 , wherein the input device driving portion controls the switch portion, and the switch portion connects the input device driving portion to the transmitting portion when the input device receives the signal corresponding to the in-touch signal.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a divisional of U.S. patent application Ser. No. 18/735,566, filed on Jun. 6, 2024 in the U.S. Patent and Trademark Office, which claims priority under 35 U.S.C. § 119 from Korean Patent Application No. 10-2023-0166856, filed in the Korean Intellectual Property Office on Nov. 27, 2023, the contents of both of which are herein incorporated by reference in their entireties. TECHNICAL FIELD Embodiments of the present disclosure are directed to a display device and a touch system that includes the same. More specifically, embodiments of the present disclosure are directed to a display device that includes a touch panel and a touch system that includes the same. DISCUSSION OF THE RELATED ART Electronic devices, such as smartphones, digital cameras, notebook computers, navigation systems, and smart televisions, that provide images to users include display devices that display images. A display device generates an image and provides the image to the user through a display screen. A display device includes a display panel that displays an image, a touch panel disposed on the display panel and that detects a user's touch, and a digitizer disposed under the display panel that detects a touch of a pen. The digitizer may be implemented using an electromagnetic method or an electromagnetic resonance method. A digitizer includes a plurality of coils. When a user moves a pen on the display device, the pen is driven by an alternating current signal that generates an oscillating magnetic field, and the oscillating magnetic field induces a signal in the coils. A position of the pen is detected through the signal induced in the coil. The digitizer determines the position of the pen by detecting electromagnetic changes that occur as the pen approaches. Two input devices, such as a touch panel and a digitizer, can be used separately, which increases the thickness of the display device. A technology that reduces the thickness of the display device is desired. SUMMARY Embodiments of the present disclosure provide a display device that can detect a first object and a second object through a touch panel. Embodiments of the present disclosure provide a touch system that includes a display device. An embodiment of the present disclosure provides a display device that includes: a touch panel that includes first dummy electrodes that extend in a first direction and are connected to each other, second dummy electrodes that extend in a second direction that crosses the first direction and are connected to each other, a first sensing electrode disposed between the first dummy electrodes and that electrically floats with the first dummy electrodes, and a second sensing electrode disposed between the second dummy electrodes and that electrically floats with the second dummy electrodes; and a touch panel driver that drives the touch panel. The first dummy electrodes may be connected to each other through a connection line, at least two of the first dummy electrodes and the connection line may surround the first sensing electrode, the second dummy electrodes may be connected to each other through the connection line, and at least two of the second dummy electrodes and the connection line may surround the second sensing electrode. The first dummy electrodes and the first sensing electrode may be formed on the same layer. The first dummy electrodes, the second dummy electrodes, the first sensing electrode, and the second sensing electrode may be formed on the same layer. The first sensing electrode may include a first sub-sensing electrode and a second sub-sensing electrode, and at least one of the first dummy electrodes may be disposed between the first sub-sensing electrode and the second sub-sensing electrode. The first dummy electrodes and the second dummy electrodes may be connected to each other. The touch panel driver may detect coordinates of a first object in a first touch period of one frame, and may detect coordinates of a second object in a second touch period of the one frame. The touch panel driver may transmit a touch driving signal to the first sensing electrode in the first touch period, receive a first touch sensing signal from the second sensing electrode in the first touch period, and detect the coordinates of the first object based on the first touch sensing signal. The touch panel driver may receive a (2-1)-th touch sensing signal from the first sensing electrode in the second touch period, receive a (2-2)-th touch sensing signal from the second sensing electrode in the second touch period, and detect the coordinates of the second object based on the (2-1)-th touch sensing signal and the (2-2)-th touch sensing signal. The touch panel driver may detect the coordinates of the second object in the second direction based on the (2-1)-th touch sensing signal, and detect the coordinates of the second object in the first direction based on the (2-2)-th touch sensing signa