Touch display device and touch sensing system

A touch sensing system comprising:

• a first touch driving circuit configured to drive a plurality of first touch electrodes;
• a second touch driving circuit configured to drive a plurality of second touch electrodes;
• and
• a touch controller configured to control the first touch driving circuit and the second touch driving circuit,
• wherein:
• the touch controller is configured to transmit or receive data to or from the first touch driving circuit and the second touch driving circuit, and transmit a read command to the first touch driving circuit and the second touch driving circuit responsive to receiving a sensing completion signal from the first touch driving circuit;
• and
• the second touch driving circuit is configured to transmit transformed sensing data to the touch controller responsive to receiving the read command in a malfunctioned state.

A touch sensing system comprising:

• a first touch driving circuit configured to drive a plurality of first touch electrodes;
• a second touch driving circuit configured to drive a plurality of second touch electrodes;
• and
• a touch controller configured to control the first touch driving circuit and the second touch driving circuit,
• wherein, responsive to a difference between a time point at which a sensing completion signal is generated by the first touch driving circuit and a time point at which when the sensing completion signal is generated by the second touch driving circuit is greater than or equal to a preset value, the touch controller changes a level of a touch driving modulation signal supplied to the first touch driving circuit and the second touch driving circuit.