Abstract: An electronic device may be provided with a sensor module and an antenna having an antenna arm, ground structures, and a tuner. The tuner may be mounted to a printed circuit overlapping the sensor module. A spring may be mounted to the printed circuit and may couple the tuner to a conductive chassis of the sensor module. The sensor module may include optical sensors that gather sensor data through a display and may form ground paths from the tuner to the ground structures. Conductive interconnect structures such as springs may exert biasing forces in different directions to couple the ground paths to different layers of the ground structures. This may serve to couple the antenna to the ground structures as close as possible to the tuner, thereby maximizing antenna performance, despite the presence of the sensor module.

Abstract: An electronic device may be provided with a flexible printed circuit and a rigid printed circuit mounted to the flexible printed circuit using a board-to-board (B2B) connector. The flexible printed circuit may include signal conductors coupled to one or more antennas on the rigid printed circuit through the B2B connector. A given one of the signal conductors may include a phase shifter segment on the flexible printed circuit and/or a thick impedance matching segment on the rigid printed circuit that help to form a smooth impedance transition from the flexible printed circuit to the rigid printed circuit and the antenna(s). The B2B connector may include signal contacts interleaved with a ground contacts. The B2B connector may include ground bars laterally surrounding the signal and ground contacts to maximize the strength of mechanical coupling between the flexible printed circuit and the rigid printed circuit.

Abstract: An electronic device may be provided with an antenna having a resonating element and a light source module mounted to a flexible printed circuit and a metal cowling. The module may emit light through a rear housing wall. The printed circuit may be interposed between the metal cowling and a conductive support plate in the rear housing wall. The printed circuit may include a ground trace coupled to the resonating element. A dimpled pad may couple the ground trace to the support plate. Compressive foam may be used to exert a force against the flexible printed circuit that presses the dimpled pad against the conductive support plate. The ground trace and the dimpled pad may form a return path to ground for the resonating element. The dimpled pad may occupy less height within the device than other structures such as metal springs.

Abstract: An electronic device may be provided with an antenna resonating element on a first substrate that is mounted to a second substrate. A signal conductor may be coupled to a feed terminal on the antenna resonating element. The signal conductor may include impedance matching structures for the antenna. The impedance matching structures may include an open transmission line stub, a grounded transmission line stub, and a phase shifting segment. The impedance matching structures may configure the antenna to exhibit a wide bandwidth in an ultra-wideband (UWB) frequency band. If desired, the signal conductor may have a phase-shifting segment configured to match a non-50 Ohm impedance of a radio-frequency front end coupled to the signal conductor.

Abstract: An electronic device may be provided with peripheral conductive housing structures having first and second segments. A flexible printed circuit may have a first tail that extends along the first and second segments and a second tail that extends along the first segment. A conductive trace on the first tail may be coupled to an antenna feed terminal on the second segment. A conductive trace on the second tail may couple the conductive trace on the first tail to the first segment. A tuner and filters may be disposed on the flexible printed circuit and may be coupled to the conductive traces. The conductive trace on the second tail may have a tapered width. An antenna in the device may have a resonating element that includes both the first and second segments, thereby allowing the antenna to exhibit a wide bandwidth from 1.1-5 GHz.

Abstract: An electronic device may be provided with a housing and an antenna. The antenna may be on a first substrate mounted to a second substrate. The housing may include a dielectric cover, a conductive plate on the dielectric cover, and a mid-chassis. The second substrate may be mounted to the mid-chassis. The antenna may include a conductive patch extending from a segment of a conductive ring on the first substrate. The conductive plate may have an opening aligned with the conductive patch. The first substrate may be separated from the dielectric cover by an air gap. A conductive gasket may couple the conductive ring to the conductive plate and may laterally surround the air gap and the opening. The antenna may convey ultra-wideband (UWB) signals through the air gap, the opening, and the dielectric cover layer.

Abstract: An electronic device may be provided with peripheral conductive housing structures having a segment that forms a resonating element for an antenna. A speaker may be mounted to a mid-chassis of the electronic device. A printed circuit may be mounted to the speaker and may have a ground trace for the antenna. A conductive spring may extend through the printed circuit and the speaker to couple the ground trace to the mid-chassis. A conductive contact pad may be welded to an aluminum layer such as an aluminum layer used to form the mid-chassis. A conductive spring such as the conductive spring coupled to the ground traces may press against the contact pad. The contact pad may include gold or nickel-plated stainless steel. The contact pad may provide a strong electrical connection between the conductive spring and the aluminum layer.

Abstract: A display substrate, a manufacturing method thereof, and a display device are disclosed. The display substrate includes: a base substrate, the base substrate includes a bonding region; and a connection terminal located in the bonding region of the base substrate, the connection terminal includes a first conductive layer and a second conductive layer being in contact with each other, the first conductive layer and the second conductive layer are overlapped with each other in a direction perpendicular to the base substrate.

Abstract: The present disclosure provides a display driver module, a display apparatus and a voltage adjustment method. The display driver module comprises a source driving unit and a power supply unit. The source driving unit is configured to generate a voltage control signal according to an acquired brightness control factor, the power supply unit is configured to adjust an operating voltage output to a cathode of a light emitting device according to the voltage control signal, the operating voltage decreases or maintains unchanged as display brightness corresponding to the brightness control factor increases, and the operating voltage output by the power supply unit in response to the brightness control factor corresponding to minimum display brightness is greater than the operating voltage output by the power supply unit in response to the brightness control factor corresponding to maximum display brightness.

Abstract: A display substrate, a manufacturing method thereof, and a display device are disclosed. The display substrate includes: a base substrate, the base substrate includes a bonding region; and a connection terminal located in the bonding region of the base substrate, the connection terminal includes a first conductive layer and a second conductive layer being in contact with each other, the first conductive layer and the second conductive layer are overlapped with each other in a direction perpendicular to the base substrate.

Abstract: The present disclosure provides a display driver module, a display apparatus and a voltage adjustment method. The display driver module comprises a source driving unit and a power supply unit. The source driving unit is configured to generate a voltage control signal according to an acquired brightness control factor, the power supply unit is configured to adjust an operating voltage output to a cathode of a light emitting device according to the voltage control signal, the operating voltage decreases or maintains unchanged as display brightness corresponding to the brightness control factor increases, and the operating voltage output by the power supply unit in response to the brightness control factor corresponding to minimum display brightness is greater than the operating voltage output by the power supply unit in response to the brightness control factor corresponding to maximum display brightness.