Abstract: A device which generates horizontal and vertical sync signals of a composite signal to create a soft picture on a display monitor by preventing a free running effect of a composite signal which is caused by a mode conversion between recorded and unrecorded areas of the picture when a composite signal generated from an alternative source such as a VCR instead of an external input signal is applied to the display monitor. The device includes a microcomputer for generating a sync select signal based on a display mode, and a composite signal analyzing and horizontal/vertical oscillating circuit for generating horizontal and vertical oscillating signals based on a luminance signal separated from a composite signal input. A horizontal sync signal generator processes the horizontal oscillating signal, to generate a composite horizontal sync signal. A vertical sync signal generator processes the vertical oscillating signal, to generate a composite vertical sync signal.

Abstract: A low consumption power circuit using an electronic switch in a display monitor is provided, which includes an electronic switch circuit for selecting a power saving mode as the power mode of the display monitor, a microcomputer for generating power off signal according to a switch signal output from the electronic switch circuit, and a main power controller for cutting off DC voltage output from a main power stage when it receives the power off signal from the microcomputer. The microcomputer is turned off using the electronic switch circuit when the display monitor is turned off, so as to minimize the consumption power in the display monitor, resulting in power saving.

Abstract: A wide band horizontal size regulation circuit of a display, is selectively switched according to input frequency, to control the amount of current transmitted to a current sensing port of a PWM IC. This circuit includes a microcomputer for generating a signal for regulating the horizontal size of a picture, a PWM-IC for generating a PWM signal for controlling the amount of current which flows through a horizontal deflection coil according to the control signal of the microcomputer, a current sensor for feeding back a current corresponding to a picture state to the PWM-IC in order to maintain a specific horizontal size, and a current controller which is selectively switched according to the control signal of the microcomputer, to control the amount of current fed back to the current sensor of the PWM-IC.

Abstract: In one arrangement of a video display apparatus according to the present invention, an audio power supply, which separated from a constant voltage generator, is directly connected to a main power supply and supplies power to an audio circuit. A microcontroller generates an audio power control signal in response to key input data entered from a key input unit. An audio power controller is provided to shut off the audio power supplied to the audio circuit in response to the audio power control signal from the microcontroller. In another arrangement, the audio power supply is connected to an auxiliary power supply for supplying power to the microcontroller. Thus, the supplying of the audio power to the audio circuit can be controlled independent of the video circuitry and in accordance with user's need.

Abstract: A video signal switching circuit according to the present invention provides a video signal switching circuit to thereby display various kinds of video signal by using a monitor.In addition, a video/audio signal switching circuit and method according to the present invention can selectively output a TV audio signal, a VCR audio signal and PC audio signal in a monitor including TV reception and video functions, to thereby reduce loads of the body of a multimedia computer.

Abstract: A computer monitor having a universal serial bus system comprises a primary power supply that supplies power to the associated circuits of the computer monitor, a hub power supply that supplies hub power through universal serial bus ports to peripheral devices, and a hub power controller that cuts off the hub power to the peripheral devices when the hub power exceeds a predetermined power level. The computer monitor includes an on-screen display controller that displays the status of hub power on a partial area of a computer monitor screen.

Abstract: A remote-controlled PC body (mainframe) and monitor controlling circuit includes a remote controller for generating an optical remote control signal in according to a key input; an optical reception unit for converting the optical remote control signal output the remote controller into an electrical remote control signal; and a first microcomputer for controlling the PC body when the electrical remote control signal output the optical reception unit is a PC body control signal to control a sound output circuit and motion picture output circuit in the PC body and for controlling the monitor when an electrical remote control signal output the optical reception unit is a monitor control signal, to control Display Power Management System and On screen display functions.

Abstract: A coupling device capable of telephone function for use with a computer system is disclosed. The coupling device incorporates internally equipped speakers so as to save space and a telephone speech network for enabling a user working on a computer system to utilize a telephone function. Accordingly, when the user is wanted on the phone, there is no need to stop working nor to surrender to any inconvenience in terms of holding a telephone set on the shoulder so as to continue work. A variety of functions embodied by the combination of a computer sound generator, a switching circuit and a telephone control circuit enhances the usage of a computer system.

Abstract: An apparatus for use in the peripheral equipment of a computer reduces the needless consumption of power. Once it has been determined that the computer has not been used for a predetermined period of time, an operation control signal indicative of a specific control mode is supplied for controlling the supply of power to the computer's peripheral equipment and the computer's operating state. The operation of a power supply means for generating operating power to a computer's peripheral equipment is controlled in response to a detected control mode. Accordingly, energy is conserved by controlling the supply of power and the operating state of a computer's peripheral equipment according to the peripheral equipment's operational state.