A flexible printed circuit board that includes a signal transmission part that is disposed in a first direction and that includes a signal line that transmits an electrical signal and a ground part disposed in a second direction. The ground part includes a conductive adhesive layer disposed in the first direction and the conductive adhesive layer includes a plurality of conductive balls having electrical conductivity. Various other embodiments are disclosed in the specification.

A high-resolution rollable display device is disclosed. The display device includes a rollable display panel having a first side and a second side that is longer than the first side. A printed circuit board is disposed along the first side of the rollable display panel. A plurality of flexible films are connected to the printed circuit board. In one embodiment, a first end of each of the plurality of flexible films is connected to the printed circuit board at the first side of the rollable display panel and a second end of each of the plurality of flexible films is connected to the second side of the rollable display panel.

An electronic device is disclosed. The electronic device includes a housing, a roller positioned inside the housing, a display panel rollable on the roller, and a guide roller positioned at an edge inside the housing. A state of the display panel with respect to the roller includes a first state in which the display panel is rolled on the roller and a second state in which the display panel is unrolled from the roller. The roller includes an outer frame which rotates when the display panel is rolled on or unrolled from the roller, and an inner frame positioned inside the outer frame and fixed to an inside of the housing regardless of rolling and unrolling the display panel.

A rollable display device includes a rollable structure including a plurality of unit structures, the rollable structure being configured to be rolled and unrolled based on the unit structures, and a display panel structure attached to the rollable structure, wherein respective widths of the unit structures increase in a first direction from a first side of the rollable structure to an opposite second side of the rollable structure.

Disclosed herein is an electrical connector. The electrical connector comprises a flexible printed circuit comprising electrical elements on a flexible substrate. The electrical elements each comprises a solder pad and contact pad connected by a link. The electrical connector also comprises a base to at least partially surround the flexible printed circuit. The base comprises a connection interface to facilitate electrical connection with the flexible printed circuit through the base. The electrical connector further comprises a receptacle to couple to the base to partially enclose the flexible printed circuit. The receptacle exposes a portion of the flexible printed circuit to facilitate selective electrical connection with the flexible printed circuit through the receptacle.

A rollable display device includes a rollable structure including a plurality of unit structures, the rollable structure being configured to be rolled and unrolled based on the unit structures, and a display panel structure attached to the rollable structure, wherein respective widths of the unit structures increase in a first direction from a first side of the rollable structure to an opposite second side of the rollable structure.

An LED filament assembly includes a frame, a first electrode disposed on a first end of the frame, and a second electrode disposed on a second end of the frame. The LED filament assembly includes a first group of LED chips capable of emitting a first color, a second group of LED chips capable of emitting a second color, and a third group of LED chips capable of emitting a third color. The first group of LED chips is disposed on the frame along a longitudinal axis, connected in series, and electrically connected to the first electrode and the second electrode. Similarly, the second and the third group of LED chips are also disposed on the frame along the longitudinal axis, connected in series, and electrically connected to the first electrode and the second electrode. A lamp including such an LED filament assembly is also disclosed.

A sensor assembly has a substrate with a first surface and a second surface opposite the first surface, at least one analyte sensor positioned on at least one of the first surface and the second surface of the substrate, and at least one electrical contact positioned on the substrate in electrical communication with a corresponding one of the at least one analyte sensor. The substrate is configured to define a tube having an interior surface, and an exterior surface. At least a portion of the first surface of the substrate defines the interior surface of the tube, and the at least one analyte sensor is disposed on at least one of the interior surface and the exterior surface of the tube.

A flexible display device includes a flexible screen; a casing including a receiving portion and a support base; and a support member between the flexible screen and the casing, the support member including a rigid support portion and a flexible support portion which are arranged in a lengthwise direction of the flexible screen. The receiving portion includes a receiving chamber configured for receiving at least a part of the flexible screen and at least a part of the flexible support portion, and the flexible screen fits slidably with the support base by means of the support member.

A display device is disclosed. The display device includes a housing, a roller installed inside the housing, a first bar positioned on an upper side of the roller to be opposite to the roller, a link connected to the first bar and the housing and lifting the first bar, a second bar positioned opposite the first bar and fastened to the first bar, a plate including a first part wound or unwound from the roller and a second part extended rearward from the first part and fixed between the first bar and the second bar, and a display panel provided in the first part of the plate.