Abstract: A portable electronic device including a first input/output unit including a monostable display element, a second input/output unit including a bistable display element, a main setting unit configured to selectively set either one of the first and second input/output units as a main input/output unit and the other one of the first and second input/output units as a sub input/output unit, and a conversion unit configured to convert the sub input/output unit into a touch pad for inputting a command on the main input/output unit.

Abstract: Provided are a piezoelectric micro speaker having a piston diaphragm and a method of manufacturing the piezoelectric micro speaker. The piezoelectric micro speaker includes: a substrate having a cavity formed therein; a vibrating membrane that is disposed on the substrate and covers at least a center part of the cavity; a piezoelectric actuator disposed on the vibrating membrane so as to vibrate the vibrating membrane; and a piston diaphragm that is disposed in the cavity and performs piston motion by vibration of the vibrating membrane. When the vibrating membrane vibrates by the piezoelectric actuator, the piston diaphragm, which is connected to the vibrating membrane through a piston bar, performs a piston motion in the cavity.

Abstract: Disclosed herein is a waterproof sound-transmitting sheet having high sound transfer efficiency and excellent water proofing performance and a method for producing same. The waterproof sound-transmitting sheet includes: a sound-transmitting layer made of a polymer material and formed in the shape of a web having a plurality of pores; and a coating layer formed on at least one side of the sound-transmitting layer to block pores existing on the surface of the sound-transmitting layer.

Abstract: Disclosed herein is a waterproof sound-transmitting sheet having high sound transfer efficiency and excellent water proofing performance and a method of producing same. The waterproof sound-transmitting sheet includes: a film-shaped sound-transmitting layer made of a first polymer material; and a webbed pigment layer formed on at least one side of the sound-transmitting layer and made of a second polymer material containing a pigment having a predetermined color, wherein the second polymer material has a melting point higher than that of the first polymer material.

Abstract: A light emitting device (LED) includes a stress control layer having a compressive stress on a substrate, a bonding layer on the stress control layer, a semiconductor layer on the bonding layer and including an active region for emitting light on the bonding layer, a first electrode on a lower surface of the substrate, and a second electrode on the semiconductor layer. The compressive stress of the stress control layer is between about 1 and about 20 GPa.

Abstract: Disclosed herein is a waterproof sound-transmitting sheet, the thickness of which can easily be adjusted and which has a high sound transmitting efficiency and excellent waterproofness, and a method for producing same. The waterproof sound-transmitting sheet, which is attached to a sound hole of a case, includes: a support layer made of a film-shaped porous material and formed in the case; and a waterproofing layer formed on one side of the support layer in the shape of a porous nanoweb in which fine fiber strands are crosswisely layered and exposed to the outside of the case.

Abstract: A solder composite is provided. The solder composite may include: a metal-based solder matrix, a capsule dispersed in the solder matrix, and a self-healing material that is encapsulated in the capsule. The self-healing material may be configured to react with the solder matrix when in contact with the solder matrix such that at least one of an electrically conductive intermetallic compound and an electrically conductive alloy is formed.

Abstract: A bonded substrate structure includes a siloxane-based monomer layer between a first substrate and a second substrate, the siloxane-based monomer layer bonding the first substrate and the second substrate. The first substrate and the second substrate may be one of a silicon substrate and a silicon oxide substrate, respectively.

Abstract: A light emitting device (LED) includes a stress control layer having a compressive stress on a substrate, a bonding layer on the stress control layer, a semiconductor layer on the bonding layer and including an active region for emitting light on the bonding layer, a first electrode on a lower surface of the substrate, and a second electrode on the semiconductor layer. The compressive stress of the stress control layer is between about 1 and about 20 GPa.

Abstract: Disclosed in the smart car seat manufacture method, which features in that the smart car seat is manufactured in such a way that the cushion pad assembly supporting the user's hips is assembled with the cushion cover covered on the cushion pad, and the back pad assembly is assembled, which supports the sit passenger's back with the light emitting raw sheet sewed on the back cover so as to form the portion which is exposed to the outside along with the back cover covered on the back pad. The smart car seat comprises the back frame, the cushion frame and the light emitting raw sheet processed along with the head rest by way of the finish process.

Abstract: Provided are a piezoelectric micro speaker and a method of manufacturing the same. The piezoelectric micro speaker includes: a substrate having a cavity therein; a diaphragm that is disposed on the substrate, the diaphragm including a vibrating membrane that overlaps the cavity; a piezoelectric actuator that is disposed on the vibrating membrane; and a weight that is disposed in the cavity and attached to a center portion of the vibrating membrane.

Abstract: A piezoelectric micro speaker and a method of manufacturing the same are provided. The piezoelectric micro speaker includes a substrate having a cavity formed therein and a diaphragm that is disposed on the substrate that overlaps the cavity. A plurality of first vibrating membranes having concentric annular ring shapes are disposed in a first region of the diaphragm corresponding to a center of the cavity. A second vibrating membrane including a different material from that of the first vibrating membranes is formed in the second region of the diaphragm corresponding to an edge of the cavity. A piezoelectric actuator for vibrating the first vibrating membranes is formed on and between the concentric annular rings of the first vibrating membranes.

Abstract: Provided is a method for fabricating a duplexer. The method includes fabricating an embedded PCB having an isolation part built therein and forming pads on certain areas of an upper side of the embedded PCB to connect with an external terminal. Further, a first filter and a second filter are separately fabricated, each having at least one film bulk acoustic resonator which is fabricated by depositing a lower electrode, a piezoelectric layer, and an upper electrode in this respective order. Thereafter, the first and second filters are bonded onto the pads formed on the embedded PCB. The entire surface of the embedded PCD is packaged at a predetermined distance from the first and second filters.

Abstract: A micro speaker includes a substrate having a cavity formed therein, a diaphragm formed on the substrate overlapping the cavity. The diaphragm includes a first vibration membrane formed in a first area corresponding to a center portion of the cavity and a second vibration membrane formed in a second area corresponding to an edge portion of the cavity and formed of material different from that used for the first vibration membrane. A piezoelectric actuator is formed including a first electrode layer formed on the first vibration membrane, a piezoelectric layer formed on the first electrode layer, and a second electrode layer formed on the piezoelectric layer, and first and second curved lead wires, respectively connected to the first and second electrode layers across the second area, which are symmetrical to the center of the piezoelectric actuator.

Abstract: In one embodiment, the electrowetting device includes a first medium; a second medium that is not mixed with the first medium and has a refractive index different from a refractive index of the first medium; an upper electrode that adjusts an angle of a boundary surface between the first medium and the second medium; and a barrier wall that has a side surface surrounding the first and second mediums, allows the upper electrode to be disposed on a portion of the side surface, and has irregular widths.

Abstract: Provided is a piezoelectric micro speaker. The piezoelectric micro speaker includes a device plate having a front cavity, a front plate having a radiation hole which communicates with the front cavity in front of the device plate, and a rear plate having a rear cavity and a vent portion. A rear portion of the device plate forms a wall of the vent portion. The device plate includes at least one first vent hole which communicates with the vent portion, and the front plate includes at least one second vent hole which communicates with the first vent hole.

Abstract: An inductor embedded in a substrate, including a substrate, a coil electrode formed by filling a metal in a spiral hole formed on the substrate, an insulation layer formed on the substrate, and an external connection pad formed on the insulation layer to be connected to the coil electrode. The inductor-embedded substrate can be used as a cap for a micro device package by forming a cavity on its bottom surface.

Abstract: A high-integrated duplexer and a fabrication method thereof. The duplexer has a first filter to pass a signal of a transmitted frequency band, a second filter to pass a signal of a received frequency band, an embedded PCB having the first and second filters bonded on a certain area of a surface of an upper side in a predetermined distance from each other, and an isolation part to prevent a signal interference between the first and second filters, and a packaging substrate to package the entire upper side of the embedded PCB so that the packaging substrate is located above and separated from the first and second filters by a predetermined distance. The fabricated high-integrated duplexer has a small size and high performance.

Abstract: Provided is a piezoelectric micro speaker. The piezoelectric micro speaker includes a device plate having a front cavity, a front plate having a radiation hole which communicates with the front cavity in front of the device plate, and a rear plate having a rear cavity and a vent portion. A rear portion of the device plate forms a wall of the vent portion. The device plate includes at least one first vent hole which communicates with the vent portion, and the front plate includes at least one second vent hole which communicates with the first vent hole.

Abstract: Provided are a piezoelectric micro speaker and a method of manufacturing the same. The piezoelectric micro speaker includes: a substrate having a cavity therein; a diaphragm that is disposed on the substrate, the diaphragm including a vibrating membrane that overlaps the cavity; a piezoelectric actuator that is disposed on the vibrating membrane; and a weight that is disposed in the cavity and attached to a center portion of the vibrating membrane.