Abstract: Disclosed is a LED device in which a plane of a substrate is patterned in a C2 symmetrical manner such that upper, lower, left, and right areas thereof are distinguished from each other. Further, in positioning the electrodes, one conductivity-type electrode is positioned on a center of the substrate, and electrodes of a conductivity-type different from that of the center electrode are positioned in an opposite manner to each other around the center electrode and are spaced from the center electrode by the same distance. Thus, even when the LED device is rotated by 180 degrees, the electrodes may match with each other. Further, disclosed are a method arranging C2 symmetrical LED devices using wave energy, and a method for fabricating a display module using the arranged C2 symmetrical LED devices. The C2 symmetrical LED device has the 180 degrees rotation symmetry. Thus, upper, lower, left, and right areas thereof are distinguished from each other, and thus, the devices may be oriented very accurately.

Abstract: Provided are a low-power ultrasound sensor that detects whether an object exists at a high speed, an object detecting method of the ultrasound sensor, and a computer-readable storage medium. The ultrasound sensor may include: a transmitter that outputs a plurality of first ultrasound beams having different frequencies; a receiver that receives a first reflection signal that is output when the output plurality of first ultrasound beams are reflected from an object; and a controller that determines a first area in a space, controls the transmitter to respectively output the plurality of first ultrasound beams to a plurality of first sub-areas that are included in the first area, and determines whether the object is included in each of the plurality of first sub-areas, based on the first reflection signal.

Abstract: Provided are a low-power ultrasound sensor that detects whether an object exists at a high speed, an object detecting method of the ultrasound sensor, and a computer-readable storage medium. The ultrasound sensor may include: a transmitter that outputs a plurality of first ultrasound beams having different frequencies; a receiver that receives a first reflection signal that is output when the output plurality of first ultrasound beams are reflected from an object; and a controller that determines a first area in a space, controls the transmitter to respectively output the plurality of first ultrasound beams to a plurality of first sub-areas that are included in the first area, and determines whether the object is included in each of the plurality of first sub-areas, based on the first reflection signal.

Abstract: A touch screen apparatus based on an ultrasonic wave is provided. The touch screen apparatus includes a display, ultrasonic sensors, and a processor. The ultrasonic sensors irradiate ultrasonic signals. The processor, in response to the ultrasonic signals being irradiated from the ultrasonic sensors, reflected from an object touched on the display, and received by the ultrasonic sensors, determines a touch point of the object based on Time of Flights (ToFs) of the received ultrasonic signals.

Abstract: A touch screen apparatus based on an ultrasonic wave is provided. The touch screen apparatus includes a display, ultrasonic sensors, and a processor. The ultrasonic sensors irradiate ultrasonic signals. The processor, in response to the ultrasonic signals being irradiated from the ultrasonic sensors, reflected from an object touched on the display, and received by the ultrasonic sensors, determines a touch point of the object based on Time of Flights (ToFs) of the received ultrasonic signals.