A display device, comprising: a display panel configured to display an image; a touch sensing device configured to sense a touch of an object; wherein the display device is in a first operating mode in response to the touch sensing device not sensing the touch of the object, and the display device is in a second operating mode in response to the touch sensing device sensing the touch of the object, a sound driver configured to generate and transmit a first sound driving signal and a second sound driving signal according to first sound data and second sound data; a sound generator configured to generate a sound according to the first sound driving signal and the second sound driving signal applied to a corresponding first pad and second pad of the sound generator; and a main processor comprising a digital signal processor; characterized in that the digital signal processor is configured to modulate the first sound data and the second sound data for each of a first frequency range, a second frequency range, and a third frequency range, the second frequency range being higher than the first frequency range, and the third frequency range being higher than the second frequency range such that a sound pressure level in the first frequency range is between a first sound pressure level and a second sound pressure level in both the first operating mode and the second operating mode, the main processor being configured to increase the sound pressure level in the first frequency range to be higher than a third sound pressure level, the third sound pressure level being higher than the first sound pressure level, and to decrease the sound pressure level in the second frequency range and the third frequency range, when the display device transitions from the second operating mode to the first operating mode; the increase or the decrease of the sound pressure level in each frequency range being determined based on a maximum value of the sound pressure level in each frequency range (FR1, FR2). a display panel configured to display an image; a touch sensing device configured to sense a touch of an object; wherein the display device is in a first operating mode in response to the touch sensing device not sensing the touch of the object, and the display device is in a second operating mode in response to the touch sensing device sensing the touch of the object, a sound driver configured to generate and transmit a first sound driving signal and a second sound driving signal according to first sound data and second sound data; a sound generator configured to generate a sound according to the first sound driving signal and the second sound driving signal applied to a corresponding first pad and second pad of the sound generator; and a main processor comprising a digital signal processor; characterized in that the digital signal processor is configured to modulate the first sound data and the second sound data for each of a first frequency range, a second frequency range, and a third frequency range, the second frequency range being higher than the first frequency range, and the third frequency range being higher than the second frequency range such that a sound pressure level in the first frequency range is between a first sound pressure level and a second sound pressure level in both the first operating mode and the second operating mode, the main processor being configured to increase the sound pressure level in the first frequency range to be higher than a third sound pressure level, the third sound pressure level being higher than the first sound pressure level, and to decrease the sound pressure level in the second frequency range and the third frequency range, when the display device transitions from the second operating mode to the first operating mode; the increase or the decrease of the sound pressure level in each frequency range being determined based on a maximum value of the sound pressure level in each frequency range (FR1, FR2).