Abstract: A display apparatus having a screen on which recording by a user's touch can be performed is provided. The display apparatus includes a display configured to provide the screen, an accommodator configured to accommodate the display and having a screen aperture formed thereon with a predetermined depth to expose the screen, a touch position sensor configured to sense the position of a touch device that is used by a user when a distance between the screen and the touch device is shorter than the predetermined depth, a vibration sensor mounted on the display and configured to sense vibration of the display due to a contact of the touch device with the screen, and a controller configured to control the display to perform recording on a point of the screen that corresponds to the sensed position of the touch device when the vibration is sensed.

Abstract: Disclosed is an apparatus for supplying power to a device. The apparatus includes a transformer configured to output a predetermined voltage to a device varying in load; a switch configured to switch on and off the voltage output from the transformer in accordance with pulse width modulation (PWM) signals; a PWM signal supplier configured to supply the PWM signal to the switch; a feedback circuit which detects the output from the transformer and applies a control signal to the PWM signal supplier; and an output voltage controller which detects a load current of the device, and adjusts the control signal of the feedback circuit by adjusting the output detected by the feedback circuit in accordance with the detected load current.

Abstract: Disclosed is an apparatus for supplying power to a device. The apparatus includes a transformer configured to output a predetermined voltage to a device varying in load; a switch configured to switch on and off the voltage output from the transformer in accordance with pulse width modulation (PWM) signals; a PWM signal supplier configured to supply the PWM signal to the switch; a feedback circuit which detects the output from the transformer and applies a control signal to the PWM signal supplier; and an output voltage controller which detects a load current of the device, and adjusts the control signal of the feedback circuit by adjusting the output detected by the feedback circuit in accordance with the detected load current.

Abstract: A display apparatus and method for channel changing are provided. The method includes receiving broadcast signals through channels; decoding and outputting a broadcast signal of a watching channel among the channels; generating and storing tables including address information and time information used to decode broadcast signals of standby channels among the channels; and in response to receiving a command to change the watching channel to one of the standby channels, decoding and outputting a broadcast signal of the changed standby channel using a table of the one of the standby channels.

Abstract: A liquid crystal display (LCD) panel is provided. The LCD panel includes: a liquid crystal layer configured to operate in a first preset phase retardation mode based on an operating mode of liquid crystals; a pre-tilt layer configured to guide a rotation direction of the liquid crystals; a polarizing layer formed on a surface of the upper substrate and having a wire grid structure to polarize and filter radiated light passing through the liquid crystal layer; and a retardation compensation film disposed between the polarizing layer and the upper substrate and configured to compensate phase retardation of the radiated light, wherein the retardation compensation film includes: a first compensation layer configured to retard the radiated light in a second phase retardation mode having a negative phase retardation; and a second compensation layer configured to retard the radiated light in a third phase retardation mode.

Abstract: A display apparatus having a screen on which recording by a user's touch can be performed is provided. The display apparatus includes a display configured to provide the screen, an accommodator configured to accommodate the display and having a screen aperture formed thereon with a predetermined depth to expose the screen, a touch position sensor configured to sense the position of a touch device that is used by a user when a distance between the screen and the touch device is shorter than the predetermined depth, a vibration sensor mounted on the display and configured to sense vibration of the display due to a contact of the touch device with the screen, and a controller configured to control the display to perform recording on a point of the screen that corresponds to the sensed position of the touch device when the vibration is sensed.

Abstract: A printed circuit board (PCB) reduces a simultaneous switching noise (SSN) causing power noise, thereby reducing radiated electromagnetic interference (EMI). In a double-layered PCB, a first substrate is arranged in parallel with a second substrate while being spaced apart from the second substrate by a predetermined distance. The first substrate includes a ground plane, which is deposited over an entirety of the first substrate. The second substrate includes a power plane deposited at a position of a component mounted to the printed circuit board (PCB) to transmit power to the component. Thus, the power trace of the PCB is simplified in structure, thereby reducing EMI radiation noise.