A touch sensor integrated display device comprising: a display panel including a pixel array, each pixel of the pixel array including an organic light emitting diode (OLED) and a driving thin film transistor applying a source-drain current (Ids) to the organic light emitting diode (OLED), the pixel array being virtually divided into a plurality of touch blocks (BLa, BLa+1, BLa+2), each touch block (BLa, BLa+1, BLa+2) comprising a plurality of horizontal pixel lines (HL1...HLm; Hlm+1...HL2m; HL2m+1...HL3m), and at least one of the horizontal pixel lines being assigned as a sensing target pixel line (HLm, HL2m, HL3m)to the respective touch block (BLa; BLa+1; BLa+2); a panel drive circuit (12, 13) configured to, in a respective touch sensing period (TSEN1; TSEN2; TSEN3), supply a scan control signal (SCAN) and a sensing control signal to pixels disposed on the at least one sensing target pixel line (HLm, HL2m, HL3m) of the respective touch block (BLa; BLa+1; BLa+2), set a gate-source voltage (Vgs) of the driving thin film transistor of each pixel disposed on the at least one sensing target pixel line (HLm, HL2m, HL3m) suitable to turn on the driving thin film transistor by applying a touch driving data voltage to a gate node (Ng) of the driving thin film transistor and applying a reference voltage to a source node (Ns) of the driving thin film transistor, and output a sensing value (Vsen) for sensing a change in the source-drain current (Ids) of the driving thin film transistor caused by a touch input; and a timing controller configured to compare the sensing value (Vsen) with a predetermined reference value and detect the touch input. a display panel including a pixel array, each pixel of the pixel array including an organic light emitting diode (OLED) and a driving thin film transistor applying a source-drain current (Ids) to the organic light emitting diode (OLED), the pixel array being virtually divided into a plurality of touch blocks (BLa, BLa+1, BLa+2), each touch block (BLa, BLa+1, BLa+2) comprising a plurality of horizontal pixel lines (HL1...HLm; Hlm+1...HL2m; HL2m+1...HL3m), and at least one of the horizontal pixel lines being assigned as a sensing target pixel line (HLm, HL2m, HL3m)to the respective touch block (BLa; BLa+1; BLa+2); a panel drive circuit (12, 13) configured to, in a respective touch sensing period (TSEN1; TSEN2; TSEN3), supply a scan control signal (SCAN) and a sensing control signal to pixels disposed on the at least one sensing target pixel line (HLm, HL2m, HL3m) of the respective touch block (BLa; BLa+1; BLa+2), set a gate-source voltage (Vgs) of the driving thin film transistor of each pixel disposed on the at least one sensing target pixel line (HLm, HL2m, HL3m) suitable to turn on the driving thin film transistor by applying a touch driving data voltage to a gate node (Ng) of the driving thin film transistor and applying a reference voltage to a source node (Ns) of the driving thin film transistor, and output a sensing value (Vsen) for sensing a change in the source-drain current (Ids) of the driving thin film transistor caused by a touch input; and a timing controller configured to compare the sensing value (Vsen) with a predetermined reference value and detect the touch input.