Abstract: An apparatus and a method for signal processing in a digital video system. The apparatus for signal processing of a digital video system has: an input unit to receive a signal quantized for M bits; and an output unit to output a value of A for (2M?N?B)times and a value of A+1 for B times during vertical scan of 2M?N times when a decimal value of high N bits is A and a decimal value of low bits of (M?N) excluding N bits is B and M>N. Accordingly, as an image signal quantized with a greater number of bits is displayed on a screen with a lesser number of bits, the quality of a picture can be improved.

Abstract: Disclosed is a white balance regulating device, including a cut-off value adjusting portion for adjusting and outputting a cut-off value of an analog image signal which is input as a first pattern; an A/D converter for converting the analog image signal, in which the cut-off value is adjusted, into a digital image signal; a detecting portion for detecting a least significant bit of each tristimulus value of the digital image signal; a controlling portion for upwardly regulating a level of a variable register of the cut-off value adjusting portion from a level corresponding to a preset first initial cut-off value until the least significant bit becomes different from the first initial cut-off value and setting the level of the variable register just before the least significant bit becomes different from the first initial cut-off value as a first cut-off value; and a storing portion for storing the first cut-off value.

Abstract: A method for gamma adjustment of a display apparatus having a gamma transform table for an input signal, the method including selecting a plurality of sample gray levels among gray levels of the input signal; measuring a brightness level of an output video signal with regard to the plurality of selected sample gray levels; determining first gamma transform values corresponding to the sample gray levels on the basis of the measured brightness level, and storing the determined gamma transform values; calculating second gamma transform values corresponding to the gray levels of the input signal excluding the sample gray level on the basis of the gamma transform values corresponding to the sample gray levels; and setting the gamma transform table on the basis of the stored first gamma transform value and the calculated second gamma transform value.

Abstract: The present invention relates to a display apparatus and a control method, which comprises a monitor displaying a picture by receiving a video signal according to a display data channel standard. The present invention is comprised of microcomputer including a voltage detector detecting a voltage level of said video signal, wherein the microcomputer determines whether or not the detected voltage level is beyond a predetermined allowable limit and controls the display apparatus to display an indication of an abnormality of the video signal if the detected voltage level is beyond the predetermined allowable limit. With this configuration, a display apparatus and a method for controlling the same, which can determine whether or not the voltage level input from a video card is abnormal, by detecting the voltage level of the video signal, and solve a unstable output generated from the video signal having the abnormal voltage level signal.

Abstract: An apparatus for and a method of continuously adjusting a brightness and a contrast of a video display. An analog video signal is converted to provide digital luminance (Y) signals and amplitudes of the digital Y signals are adjusted based on determining whether the digital Y signals of a frame have amplitudes corresponding to one or more of four regions of digital values. The four regions include a highest region, a second highest region, a lowest region and a second lowest region. Contrast is adjusted based on whether digital Y values of the frame are included for the highest region and/or the second highest region and brightness is adjusted based on whether digital Y values are included for the lowest region and/or the second lowest region.

Abstract: A display apparatus includes a power supply comprising a commercial AC power supplying part, a transformer having a primary coil and a secondary coil and supplying an AC voltage to driving circuits, and a feedback voltage sensing part sensing a load of the secondary coil. The power supply further includes a power mode information part outputting information for determining a normal mode or a power saving mode according to an input of a synchronous signal. The power supply also includes a power driving part including a power driver generating a power regulating signal according to a synchronous signal on the basis of a feedback voltage sensed by the feedback voltage sensing part at the normal mode, and an idle power driver generating a power saving voltage on the basis of a synchronous signal which is made by synthesizing different frequency signals at the power saving mode; an idle switching part turning on/off the idle power driver.

Abstract: A display apparatus having a display part, comprising an amplifying part amplifying an inputted picture signal and transmitting it to the display part; a clock signal generating part generating a clock signal in synchronization with at least one of vertical and horizontal synchronous signals transmitted together with the inputted picture signal; and a controller controlling the amplifying part to adjust an amplification rate so that brightness is alternately changed within a predetermined limit according to at least one of periods of the horizontal and vertical synchronous signals, synchronizing with the clock signal generated from the clock signal generating part. With this configuration, clear and bright moving pictures can be displayed, and the life span of the display apparatus can be lengthened.

Abstract: The present invention relates to an apparatus and a method for reproducing real colors of a video system. The apparatus comprises a video signal generating device for storing, in an internal memory, a first test video signal in which inherent RGB color sensitivity information thereof is included; and a video signal display device for storing, in an internal memory, a second test video signal in which inherent RGB color sensitivity information thereof is included. The video signal device synthesizes the first test video signal from the video signal generating device and the second test video signal read from the internal memory based on a request from a user for display on a screen, adjusts an amplitude degree of the first test video signal until color sensitivity of the first test video signal matches color sensitivity of the second test video signal, and amplifies all video signals from the video signal generating device based on the adjusted amplitude degree for display on the screen.

Abstract: An A/D conversion apparatus of a digital video system includes an A/D converter for converting an input analog video signal to a digital signal on the basis of a reference voltage value input from the outside and outputting the digital signal; and a reference voltage supplying portion for supplying the A/D converter with a predetermined number of the reference voltage value sequentially and repeatedly during a predetermined time period. Accordingly, since the quantization error can be minimized during the A/D conversion in the digital video system without increasing the number of the quantization bits, the image quality can be improved.

Abstract: An apparatus and a method for signal processing in a digital video system. The apparatus for signal processing of a digital video system has: an input unit to receive a signal quantized for M bits; and an output unit to output a value of A for (2M-N−B)times and a value of A+1 for B times during vertical scan of 2M-N times when a decimal value of high N bits is A and a decimal value of low bits of (M-N) excluding N bits is B and M>N. Accordingly, as an image signal quantized with a greater number of bits is displayed on a screen with a lesser number of bits, the quality of a picture can be improved.

Abstract: A horizontal dynamic focus regulation circuit, which induces a horizontal dynamic focus waveform voltage by a horizontal deflection circuit generating a different frequency according to a display mode of a display apparatus, comprising a microcomputer outputting a plurality of control signals; a plurality of switching parts corresponding to the plurality of control signals outputted from the microcomputer, respectively; a plurality of S-regulation capacitors connecting with the plurality of switching parts in series, respectively; an auxiliary capacitor provided on a line diverged from a line connecting each switching part with each S-regulation capacitor, and being respectively connected with the S-regulation capacitor in parallel and series according to switching on and off of the switching part. With this configuration, the dynamic focus regulation circuit supplies a uniform parabolic waveform voltage regardless of variation of a horizontal frequency in a display mode.

Abstract: Disclosed is a white balance regulating device, including a cut-off value adjusting portion for adjusting and outputting a cut-off value of an analog image signal which is input as a first pattern; an A/D converter for converting the analog image signal, in which the cut-off value is adjusted, into a digital image signal; a detecting portion for detecting a least significant bit of each tristimulus value of the digital image signal; a controlling portion for upwardly regulating a level of a variable register of the cut-off value adjusting portion from a level corresponding to a preset first initial cut-off value until the least significant bit becomes different from the first initial cut-off value and setting the level of the variable register just before the least significant bit becomes different from the first initial cut-off value as a first cut-off value; and a storing portion for storing the first cut-off value.

Abstract: A display apparatus includes a power supply comprising a commercial AC power supplying part, a transformer having a primary coil and a secondary coil and supplying an AC voltage to driving circuits, and a feedback voltage sensing part sensing a load of the secondary coil. The power supply further includes a power mode information part outputting information for determining a normal mode or a power saving mode according to an input of a synchronous signal. The power supply also includes a power driving part including a power driver generating a power regulating signal according to a synchronous signal on the basis of a feedback voltage sensed by the feedback voltage sensing part at the normal mode, and an idle power driver generating a power saving voltage on the basis of a synchronous signal which is made by synthesizing different frequency signals at the power saving mode; an idle switching part turning on/off the idle power driver.

Abstract: A display apparatus having a high voltage FBT driving circuit includes a transformer having a primary and a secondary coil, a high voltage detector to detect an output voltage of the secondary coil, a high voltage compensator to output a high voltage compensating signal based on the detected voltage, a DC voltage controller to adjust a DC voltage according to the high voltage compensating signal and to output the adjusted DC voltage to the primary coil, a horizontal deflector to generate a horizontal deflecting pulse based on the DC voltage, a turns ratio adjuster to adjust a turns ratio of the primary and secondary coils, and a controller to control the turns ratio adjuster so as to make the output DC voltage higher than a lower limit when the frequency of a received horizontal synchronous signal is lower than a predetermined reference level.

Abstract: A horizontal dynamic focus regulation circuit, which induces a horizontal dynamic focus waveform voltage by a horizontal deflection circuit generating a different frequency according to a display mode of a display apparatus, comprising a microcomputer outputting a plurality of control signals; a plurality of switching parts corresponding to the plurality of control signals outputted from the microcomputer, respectively; a plurality of S-regulation capacitors connecting with the plurality of switching parts in series, respectively; an auxiliary capacitor provided on a line diverged from a line connecting each switching part with each S-regulation capacitor, and being respectively connected with the S-regulation capacitor in parallel and series according to switching on and off of the switching part. With this configuration, the dynamic focus regulation circuit supplies a uniform parabolic waveform voltage regardless of variation of a horizontal frequency in a display mode.

Abstract: Disclosed is a display system displaying a picture on a screen by a video signal from a computer and serving as an input device of a computer coupled to the display system. The display system includes an input part through which a user inputs data, a signal processing part converting a signal inputted from the input part into a signal to be identified by the computer, a data interface between the computer and the display system, and a controlling part transmitting the signal inputted from the input part to the computer via the signal processing part and the data interface.

Abstract: A display apparatus having a display part, comprising an amplifying part amplifying an inputted picture signal and transmitting it to the display part; a clock signal generating part generating a clock signal in synchronization with at least one of vertical and horizontal synchronous signals transmitted together with the inputted picture signal; and a controller controlling the amplifying part to adjust an amplification rate so that brightness is alternately changed within a predetermined limit according to at least one of periods of the horizontal and vertical synchronous signals, synchronizing with the clock signal generated from the clock signal generating part. With this configuration, clear and bright moving pictures can be displayed, and the life span of the display apparatus can be lengthened.

Abstract: A circuit for regulating the brightness and size of picture in a display apparatus is disclosed, in which a picture brightness regulating circuit and a picture size regulating circuit are organically coupled together, and the picture brightness and size are decided by utilizing composite adjusting signals of a microcomputer. The display apparatus receives and amplifies RGB signals from a computer main body to output them to a cathode ray tube, supplies a high voltage from a fly back transformer to the cathode ray tube, and carries out horizontal deflections by a horizontal deflecting circuit. The circuit for regulating the brightness and picture size in the display apparatus according to the present invention includes the following elements. A current sensing section senses the intensities of beam currents incoming into the cathode ray tube.

Abstract: The present invention relates to a display apparatus and a control method, which comprises a monitor displaying a picture by receiving a video signal according to a display data channel standard. The present invention is comprised of microcomputer including a voltage detector detecting a voltage level of said video signal, wherein the microcomputer determines whether or not the detected voltage level is beyond a predetermined allowable limit and controls the display apparatus to display an indication of an abnormality of the video signal if the detected voltage level is beyond the predetermined allowable limit. With this configuration, a display apparatus and a method for controlling the same, which can determine whether or not the voltage level input from a video card is abnormal, by detecting the voltage level of the video signal, and solve a unstable output generated from the video signal having the abnormal voltage level signal.

Abstract: A horizontal-deflection correction circuit may be constructed with a horizontal deflection stage for deflecting a scan electronic beam in a horizontal direction by a sawtooth current flowing in horizontal deflection coil; a control stage for outputting a first and second control voltages which have the same value in case of performing a linear correction and for outputting the first and second control voltages which have different values in case of performing a S-shaped correction; a first correction stage for varying an inductance of a first variable inductor connected in series to the horizontal deflection coil according to the first control voltage and for correcting a magnitude and a direction of the sawtooth current; and a second correction stage for varying an inductance of the second variable inductor connected in series to the first variable inductor in an opposite polarity and for correcting the magnitude and the direction of the sawtooth current.