In-cell touch display device

An in-cell touch display device, comprising:

• a display panel including a transistor formation layer that includes a driving transistor having a semiconductor, a source electrode, a drain electrode, and a gate electrode, a light emitting element layer on the transistor formation layer that includes light emitting element having an anode electrode, an emission layer, and a cathode electrode, and a plurality of touch electrodes in the transistor formation layer or the light emitting element layer, wherein the plurality of touch electrodes are driven during a display period and a touch period in a time-division manner;
• a touch driving circuit configured to supply a touch driving voltage of a predetermined cycle and a predetermined amplitude to a touch electrode of the plurality of touch electrodes;
• a first RLC circuit including a first resistor, a first inductor, and a first capacitor that are connected to a high potential power line through which a high potential power voltage is supplied to the driving transistor, at least the first resistor and the first inductor connected in parallel, the first RLC circuit modulating the high potential power voltage into a high potential modulation voltage having a first resonance frequency of the first resistor, the first inductor, and the first capacitor, and the first RLC circuit supplying the high potential modulation voltage to the display panel;
• a second RLC circuit including a second resistor, a second inductor, and a second capacitor that are connected to a low potential power line through which a low potential power voltage that is less than the high potential power voltage is supplied to the cathode electrode, at least the second resistor and the second inductor connected in parallel, the second RLC circuit modulating the low potential power voltage into a low potential modulation voltage having a second resonance frequency of the second resistor, the second inductor, and the second capacitor, and the second RLC circuit supplying the low potential modulation voltage to the display panel;
• and
• an addition circuit configured to:
• output a modulated display voltage to a display driving circuit by adding the low potential modulation voltage and a display voltage, and
• output a modulated touch voltage to the touch driving circuit by adding the low potential modulation voltage and the touch driving voltage.

An in-cell touch display device, comprising:

• a display panel including a plurality of sub-pixels and a plurality of touch electrodes, the display panel driven during a display period and a touch period in a time-division manner;
• a source driver circuit configured to supply, during the display period, a data voltage corresponding to image data to the display panel;
• a gate driver circuit configured to supply, during the display period, a scan pulse to the display panel, the scan pulse synchronized with the data voltage;
• a touch driving circuit configured to:
• supply a touch driving voltage of a predetermined cycle and a predetermined amplitude to a touch electrode of the plurality of touch electrodes;
• and
• sense a change in capacitance of the touch electrode;
• and
• a power modulation circuit configured to:
• modulate a high potential power voltage into a high potential modulation voltage having a same cycle and an amplitude as the touch driving voltage;
• modulate a low potential power voltage that is less than the high potential power voltage into a low potential modulation voltage having the same cycle and the same amplitude as the touch driving voltage;
• supply, during the touch period, the high potential modulation voltage and the low potential modulation voltage to the plurality of sub-pixels;
• supply a modulated display voltage having the same cycle and the same amplitude as the touch driving voltage to the gate driver circuit and the source driver circuit;
• and
• supply a modulated reference voltage having the same cycle and the amplitude as the touch driving voltage to the touch driving circuit based on the high potential modulation voltage and the low potential modulation voltage.