A flexible display device configured to be bent, comprising: an organic light emitting display panel ; a touch force sensing device overlapping with the display panel , the touch force sensing device comprising: a force driving electrode (331, TX); a first force sensing electrode (332, RX1) spaced apart from the force driving electrode (331, TX); and a resistive layer separated from the force driving electrode (331, TX) and the first force sensing electrode (332, RX1) by a gap, wherein a contact area between the force driving electrode (331, TX) and the resistive layer is configured to vary depending on a force of a touch, and a contact area between the first force sensing electrode (332, RX1) and the resistive layer is configured to vary depending on the force of the touch; the flexible display device further comprising: a control circuit configured to sense a change of resistance between the force driving electrode (331, TX) and the first force sensing electrode (332, RX1), and to detect the force of the touch based on the change of resistance; and a touch position sensing device configured to sense a position of the touch input; wherein the control circuit is an integrated circuit (IC) chip configured to control both the touch force sensing device and the touch position sensing device ; wherein the touch force sensing device is configured to compensate for a change in resistance value depending on temperature, and wherein the touch force sensing device is configured to detect a temperature change on the basis of a capacitance change of the touch position sensing device . an organic light emitting display panel ; a touch force sensing device overlapping with the display panel , the touch force sensing device comprising: a force driving electrode (331, TX); a first force sensing electrode (332, RX1) spaced apart from the force driving electrode (331, TX); and a resistive layer separated from the force driving electrode (331, TX) and the first force sensing electrode (332, RX1) by a gap, wherein a contact area between the force driving electrode (331, TX) and the resistive layer is configured to vary depending on a force of a touch, and a contact area between the first force sensing electrode (332, RX1) and the resistive layer is configured to vary a force driving electrode (331, TX); a first force sensing electrode (332, RX1) spaced apart from the force driving electrode (331, TX); and a resistive layer separated from the force driving electrode (331, TX) and the first force sensing electrode (332, RX1) by a gap, wherein a contact area between the force driving electrode (331, TX) and the resistive layer is configured to vary depending on a force of a touch, and a contact area between the first force sensing electrode (332, RX1) and the resistive layer is configured to vary depending on the force of the touch; the flexible display device further comprising: a control circuit configured to sense a change of resistance between the force driving electrode (331, TX) and the first force sensing electrode (332, RX1), and to detect the force of the touch based on the change of resistance; and a touch position sensing device configured to sense a position of the touch input; a control circuit configured to sense a change of resistance between the force driving electrode (331, TX) and the first force sensing electrode (332, RX1), and to detect the force of the touch based on the change of resistance; and a touch position sensing device configured to sense a position of the touch input; wherein the control circuit is an integrated circuit (IC) chip configured to control both the touch force sensing device and the touch position sensing device ; wherein the touch force sensing device is configured to compensate for a change in resistance value depending on temperature, and wherein the touch force sensing device is configured to detect a temperature change on the basis of a capacitance change of the touch position sensing device . <EOS>