The present disclosure discloses a display device comprising a display control module and a display module connected to the display control module, wherein the display control module comprises a display drive component and a security component connected to each other. The security component is configured to enable the display device to enter a secure and trusty display mode, and encrypt and decrypt displayed information in the secure and trusty display mode. A mobile device comprising the display device and a method for display using the mobile device are disclosed.

An image display apparatus are disclosed. The image display apparatus includes a display including a first electrode and a second electrode, for wireless power reception, a signal processor disposed apart from the display, and including a third electrode and a fourth electrode, for wireless power transmission, and a first bridge electrode and a second bridge electrode, including one ends apart from the first electrode and the second electrode, facing the first electrode and the second electrode, and the other ends apart from the first bridge electrode and the second bridge electrode, facing the first bridge electrode and the second bridge electrode.

There is provided a capacitive communication system including an object and a capacitive touch panel. The object includes a plurality of induction conductors configured to have different potential distributions at different time intervals by modulating respective potentials thereof. The capacitive touch panel includes a plurality of sensing electrodes configured to form a coupling electric field with the induction conductors to detect the different potential distributions at the different time intervals. When the different potential distributions match a predetermined agreement between the object and the capacitive touch panel, a near field communication is formed between the object and the capacitive touch panel.

Aspects of the subject disclosure may include, for example, a coupling device includes a circuit that receives a signal. At least one passive electrical circuit element generates an electromagnetic field in response to the signal. A portion of the electromagnetic field is guided by a surface of a transmission medium to propagate as a guided electromagnetic wave longitudinally along the transmission medium. Other embodiments are disclosed.

Described herein are systems and methods that create a capacitive link based on a rotating cylinder capacitor. A cylindrical rotor rotates around a shaft and maintains an air gap between the cylindrical rotor and the shaft and to create one or more air gap capacitors. A first subsystem, comprising a light detection and ranging components, is coupled to the rotor. A second sub-subsystem, comprising data analysis functions, is coupled to the shaft. The first subsystem and the second subsystem are coupled via capacitive links created by the air gap capacitors. The communication signaling utilized on the capacitive links may be bi-directional and differential signaling. The first subsystem and the second subsystem may comprise a LIDAR light detection and ranging system. The second subsystem may power the first subsystem via inductive coupling.

One example discloses a near-field communications device, including: a receiver configured to be coupled to a first near-field antenna having a first radiation pattern, and to a second antenna having a second radiation pattern; wherein the first radiation pattern and the second radiation pattern are not spatially aligned; wherein the receiver is configured to subtract a second signal received from the second antenna from a first near-field signal received from the first near-field antenna.

A wireless communication apparatus may include: an oscillator including a coil assembly exposed to an outside of the wireless communication apparatus, a variable capacitor, and a negative resistor; and a phase locking circuit connected to the coil assembly and the negative resistor. The phase locking circuit may be configured to generate a control signal to lock an oscillation frequency of the oscillator based on an oscillation signal generated by the oscillator, and provide the generated control signal to the variable capacitor.

A communication system comprises a first conductor member in which a first signal line is connected at a connection position other than end portions on a surface of the first conductor member, a second conductor member connected with a second signal line, and a communication control unit that controls wireless communication by electromagnetic coupling between a first coupler including the first conductor member and a second coupler including the second conductor member. A distance between the connection position and a farthest point from the connection position on the surface of the first conductor member is equal to or less than a quarter wavelength corresponding to a signal to be used in communication by the communication control unit.

A communication system performs wireless communication using electromagnetic field coupling between a transmission coupler and a reception coupler and moves at least one of the transmission coupler and the reception coupler so as to change the position in a predetermined direction of the reception coupler relative to the transmission coupler. In the communication system, the greater the distance between an overlap portion where the transmission coupler and the reception coupler overlap as viewed from a vertical direction to the predetermined direction and an input end of the transmission coupler is, the higher the degree of coupling between the transmission coupler and the reception coupler becomes.

A smartphone case that enables millimeter-wave band communication to be robust in terms of connection stability is provided. The smartphone case is to be removably attached to a smartphone and includes one or more millimeter-wave band communication antennas associated with a communication circuit for carrying out millimeter-wave band communication. This configuration offers a high degree of flexibility in the layout of the one or more millimeter-wave band communication antennas, with the performance of a 5G communication system being fully exploited.