Abstract: An apparatus and method of self-diagnosing a video signal in an LCD panel is disclosed. The apparatus includes a micro-controller, a switching unit and a diagnosis transmitter. The micro-controller generates and outputs a switching control signal representing an operation mode, which includes a self-diagnosis mode and a normal operation mode. The switching unit selects an input signal of a receiver according to the switching control signal from the micro-controller. When the switching control signal represents the self-diagnosis mode, the diagnosis transmitter receives a test video signal having a predetermined display pattern from the micro-controller, and the test video signal is then fed back to the micro-controller. The micro-controller detects whether the test video signal is in trouble by comparing the test video signal from the micro-controller with the video signal fed back to the micro-controller.

Abstract: A device for testing a digital monitor which enables to test for each kind of operation in a digital monitor is disclosed. It includes a Field Programmable Gate Array (FPGA) for outputting a timing control signal, an oscillation section for generating a reference clock pulse for the FPGA, and an input selection section for selecting a resolution or a color pattern of an input image of a monitor. It can also include a microcomputer to control the FPGA, so as to output a timing control signal according to the resolution selected in the input selection section, and output color control data for controlling the input image of the monitor to correspond to the color pattern selected in the input selection section. Next, it includes a transmitter for transmitting digital R/G/B image signals and clock pulses to the monitor according to the timing control signal outputted from the FPGA and the color control data outputted from the microcomputer.

Abstract: An apparatus and method of self-diagnosing a video signal in an LCD panel is disclosed. The apparatus includes a micro-controller, a switching unit and a diagnosis transmitter. The micro-controller generates and outputs a switching control signal representing an operation mode, which includes a self-diagnosis mode and a normal operation mode. The switching unit selects an input signal of a receiver according to the switching control signal from the micro-controller. When the switching control signal represents the self-diagnosis mode, the diagnosis transmitter receives a test video signal having a predetermined display pattern from the micro-controller, and the test video signal is then fed back to the micro-controller. The micro-controller detects whether the test video signal is in trouble by comparing the test video signal from the micro-controller with the video signal fed back to the micro-controller.

Abstract: A backlight consumption time display method and apparatus for an LCD monitor is disclosed. A the backlight consumption time stored in a memory storage unit with a preset backlight maximum consumption time is periodically compared. A backlight replacement instruction message is displayed on the screen when a hitherto backlight consumption time exceeds the maximum consumption time and, after the backlight replacement, the backlight consumption time stored in the memory storage unit is reset using a reset key in the key input unit. A timer is operated when a backlight driving control signal is turned on, a backlight consumption time preset in a memory storage unit is counted and the counted value is stored in a memory storage unit.

Abstract: A monitor having a microcomputer for performing a serial peripheral interface (SPI) communication with a personal computer (PC) which can improve the communicability between the PC and the monitor. The monitor includes an interface using in common one communication type utilizing a serial clock and a serial data through a printer port of the PC and the other communication type utilizing RS232C through a COM port of the PC, and data is stored in or read out from the microcomputer through the interface. The interface performs an input/output of the serial data utilizing the printer port and the COM port.

Abstract: A video input level control circuit in a video display device which can improve picture quality of the video appliance by selectively controlling input levels of the video signals inputted in different manners from different-typed video cards of a PC so that the input levels may be minimal.

Abstract: An analog keyboard of a video display appliance which serves to minimize the number of control switches of an analog keyboard and enables the diverse design of a monitor in the video display appliance. The analog keyboard includes a plurality of encoding switches having at least two contact terminals for consecutively outputting pulse signals according to the rotation of the encoding switches clockwise or counter-clockwise.

Abstract: An automatic input signal switching circuit of a monitor having a BNC (binary number code) signal terminal and a D-sub (D type-sub miniature connector) signal terminal and a switching method thereof, the circuit having a video signal switch receiving video signals from the BNC signal terminal and the D-sub signal terminal, a video signal processor receiving one of the video signals from the BNC signal terminal and the D-sub signal terminal, the received video signal being selected at the video signal switch, a synchronization signal switch receiving a vertical synchronization signal and a horizontal synchronization signal from the BNC signal terminal and a vertical synchronization signal and a horizontal synchronization signal from the D-sub signal terminal, a detector receiving a detection signal representing a connection state between the D-sub signal terminal and a personal computer, a microcomputer receiving an output of the detector, for generating a control signal, and a switching controller receiving t