This application claims priority to Korean Patent Application No. 10-2020-0066096, filed on, Jun. 1, 2020, and all the benefits accruing therefrom under 35 U.S.C. § 119, the content of which in its entirety is herein incorporated by reference.

BACKGROUND

1. Field

The disclosure relates to a display device.

2. Description of the Related Art

As an information technology is developed, importance of a display device, which is a connection medium between a user and information, is emphasized. Accordingly, use of a display device such as a liquid crystal display device, an organic light emitting display device, and a plasma display device has been increasing.

To satisfy user demand, a display area of the display device is enlarged and a resolution of the display area becomes high, and a non-display area and space are continuously decreasing. Accordingly, degree of integration of internal circuits in the display device becomes higher and a transmission speed of signals is increasing. Accordingly, interference between signals becomes a problem.

SUMMARY

A technical object to be solved is to provide a display device capable of preventing interference of signals between a sensor driver and a display driver with a minimum configuration.

A display device according to an embodiment of the disclosure includes a panel including pixels, and first sensors and second sensors overlapping the pixels, a circuit board. The circuit board includes a first sensor pad electrically connected to the respective first sensors, a second sensor pad electrically connected to the respective second sensors, and a data pad electrically connected to respective pixels, a sensor driver, a first sensor connection line having one end connected to the first sensor pad and the other end connected to the sensor driver, a second sensor connection line having one end connected to the second sensor pad and the other end connected to the sensor driver, a data extension line having one end connected to the data pad, and a first decoupling capacitor connected to the first sensor line disposed between the sensor driver and a first point where the first sensor connection line and the data extension line cross.

The circuit board may further include a second decoupling capacitor connected to the first sensor connection line disposed between the first point and the sensor driver.

A portion of the first sensor connection line, which extends between the first point and the sensor driver, the first decoupling capacitor, and the second decoupling capacitor may constitute a low pass filter.

A pass band of the low pass filter may correspond to a frequency of a first sensor signal received by the sensor driver through the first sensor connection line, and a cut-off band of the low pass filter may correspond to a frequency of a data signal transmitted to the data pad through the data extension line.

The sensor driver may include a sensor receiver connected to the other end of the first sensor connection line and receiving a first sensor signal through the first sensor connection line, and a sensor transmitter connected to the other end of the second sensor connection line and transmitting a second sensor signal through the second sensor connection line.

The respective first sensor and the respective second sensor may form a mutual capacitance.

The sensor receiver may include an operational amplifier having a first input terminal connected to the other end of the first sensor connection line, and a second input terminal connected to a reference power.

The sensor receiver may further include an analog-to-digital converter connected to an output terminal of the operational amplifier.

The sensor receiver may further include a capacitor and a switch connected in parallel between the first input terminal and an output terminal of the operational amplifier.

The second sensor connection line may not be connected to any decoupling capacitor between the sensor driver and a second point where the second sensor connection line and the data extension line cross.

A first pixel among the pixels may include a first transistor having a first electrode electrically connected to the data pad, and a gate electrode electrically connected to a scan line.

The first pixel may further include a second transistor having a first electrode connected to a first power line and a gate electrode connected to a second electrode of the first transistor, a storage capacitor having a first electrode connected to the first power line and a second electrode connected to the gate electrode of the second transistor, and a light emitting diode having an anode connected to a second electrode of the second transistor and a cathode connected to a second power line.

The circuit board may further include a second decoupling capacitor connected to the second sensor connection line disposed between the sensor driver and a second point where the second sensor connection line and the data extension line cross.

The circuit board may further include a third decoupling capacitor connected to the first sensor connection line disposed between the first point and the sensor driver.

The circuit board may further include a fourth decoupling capacitor connected to the second sensor connection line disposed between the second point and the sensor driver.

A portion of the first sensor connection line, which extends between the first point and the sensor driver, the first decoupling capacitor, and the third decoupling capacitor may constitute a first low pass filter.

A portion of the second sensor connection line, which extends between the second point and the sensor driver, the second decoupling capacitor, and the fourth decoupling capacitor may constitute a second low pass filter.

A pass band of the first low pass filter may correspond to a frequency of a first sensor signal received by the sensor driver through the first sensor connection line, and a cut-off band of the first low pass filter may correspond to a frequency of a data signal transmitted to the data pad through the data extension line.

A pass band of the second low pass filter may correspond to a frequency of a second sensor signal received by the sensor driver through the second sensor connection line, and a cut-off band of the second low pass filter may correspond to the frequency of the data signal.

The sensor driver may include a sensor receiver including an operational amplifier having a first input terminal connected to the other end of the first sensor connection line, and receiving a first sensor signal through the first sensor connection line, and a sensor transmitter configured to transmit a driving signal to a second input terminal of the operational amplifier.

The display device according to the disclosure may prevent interference of signals between a sensor driver and a display driver with a minimum configuration.

