Touch device and operation method thereof

A touch device, comprising:

• a processor;
• and
• a driving circuit coupled to the processor, wherein
• the processor performs an active object detection on a touch panel through the driving circuit during a first period to detect a first position of an active stylus on the touch panel;
• the processor performs a passive object detection on the touch panel through the driving circuit during a second period different from the first period to detect a second position of a passive object on the touch panel;
• the processor defines a first detection range on the touch panel based on the first position of the active stylus, wherein the first position is comprised in the first detection range;
• the processor defines a second detection range on the touch panel based on the first detection range, wherein the first detection range is mutually exclusive from the second detection range;
• and
• during a third period different from the first period and the second period, the processor performs the active object detection in the first detection range through the driving circuit, and the processor disables or ignores the active object detection in the second detection range.