Abstract: The present disclosure relates to a polyimide-based resin film comprising a polyimide-based resin containing a polyimide repeating unit represented by Chemical Formula 1 and a polyimide repeating unit represented by Chemical Formula 2, a substrate for display device, and an optical device using the same.

Abstract: Disclosed is an amplification circuit, which includes a first amplifier that receives an external signal and performs first band pass filtering on the external signal to output a first filter signal, and a second amplifier that receives the first filter signal and performs second band pass filtering on the first filter signal to output a second filter signal, and a frequency pass bandwidth of the second band pass filtering is narrower than a frequency pass bandwidth of the first band pass filtering.

Abstract: A hybrid communication device, an operation method thereof, and a communication system including the same are provided. The hybrid communication device includes a contact unit that includes an antenna for receiving a first communication signal and an electrode for receiving a second signal, a switch controller that includes a first switch and a second switch and controls the first switch and the second switch based on a change in capacitance of the electrode, and a signal processing unit that receives at least one of the first communication signal and the second communication signal from the contact unit via the first switch and processes the received signal. The first switch is connected to the contact unit, and the signal processing unit is connected to the first switch.

Abstract: The present disclosure relates to a polyimide-based resin film wherein a thermal hysteresis gap at a temperature of 50° C. or more and 150° C. or less is 100 ?m or more and 500 ?m or less, and a substrate for display device, and an optical device using the same.

Abstract: The present disclosure provides a polyimide film having improved heat resistance and refractive index by using a polyimide precursor composition comprising a diamine of Chemical Formula 1 and an acid dianhydride of Chemical Formula 2 as polymerization components, thereby reducing the difference in refractive index from the upper layer to improve bottom emission efficiency.