The embodiments of the present disclosure relate to a touch display device (10), a touch system, a touch drive circuit (TIC), a stylus (20) and a pin detection method, and more particularly, to a touch display device (10), a touch system, a touch drive circuit (TIC) Stylus (20) and a stylus detection method capable of receiving a first downlink signal and a second downlink signal output from the stylus (20) through all or some of a plurality of touch electrodes (TE) and the stylus (20) can determine based on a received signal strength for each touch electrode (TE) for the first downlink signal and a received signal strength for each touch electrode (TE) for the second downlink signal. According to the embodiments of the present disclosure, the pen (20) can be accurately detected even when a user uses the pen (20) in a tilted manner.
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