Abstract: A raster center control circuit for a CRT-type display device that automatically determines a correct horizontal center position of a raster, regardless of a horizontal sync frequency input from a video card. The raster center control circuit includes a horizontal deflection circuit, electrically connected to a horizontal deflection yoke, to supply the horizontal deflection yoke with a parabolic wave signal used to determine a horizontal center position of the raster. A memory device stores predetermined values for raster control according to horizontal sync signal frequencies. A microprocessor determines a frequency of a horizontal sync signal and generates a raster control signal by converting one of the predetermined values stored in the memory device into a raster control signal according to the predetermined frequency.

Abstract: A switching element is provided, which is capable of short-circuiting or opening three or more nodes simultaneously, and in which the surface area occupied on a substrate can be reduced. The switching element of the present invention has an active layer, an insulating film contacting the active layer, a gate electrode contacting the insulating film, and three or more connection electrodes. The active layer has at least one channel forming region and three or more impurity doped regions, and the connection electrodes are each connected to a different impurity region. An impurity region contacting an arbitrary connection electrode contacts only one of the channel forming regions.

Abstract: A cathode ray tube (CRT) display includes a display panel having a matrix of addressable carbon nanotubes, in which each individual nanotube can be selected to help draw a corresponding electron beam from a red, green, or blue electron gun to the desired portion of the display panel, thereby creating the desired image on through the display panel.

Abstract: A technique for collectively setting a factory mode of operation of a monitor offers adjustments or modifications for particulars of mode data to meet user requirements, by transmitting a set of factory mode timing data from an external controller to an electrically erasable programmable read only memory using a serial interface data communication. A factory mode data transmission process includes the steps of transmitting a start data signal to a microcomputer in a monitor when a storage key input is fed to the external controller, repeatedly sending the timing data until a mode end signal is input and sending a mode end data to the microcomputer when a mode end signal is input. In addition, a factory mode data receiving process includes the steps of sending back the start data received to the external controller, storing mode timing data received into a factory mode address reserved in a memory in the monitor and ending the reception of mode timing data when mode end data is inputted.

Abstract: A device for coding an error generated in processing sync signals is adapted to code an error caused the incompatibility between a video card and a display monitor so that the user can analyze the cause of the error in the sync signals more effectively from the error code displayed on an OSD display. The device includes: a microcomputer responsive to horizontal and vertical sync signals generated by a video card for discriminating resolutions, and coding an error signal into an error code during discrimination of the resolutions; and an error code section for saving the error code received from the microcomputer.

Abstract: A method for storing status information prior to shutdown of a video monitor due to a failure. An indication of an operational parameter is obtained. Based on the indication, it is determined if the failure occurs warranting shutdown. If the failure occurs, status information is stored in a non-volatile memory for later retrieval during repair. A shutdown sequence is generated to disable the video monitor.

Abstract: An emitter follower amplifier is coupled between the output of a high voltage video amplifier and the cathode of a kinescope for reducing the effective capacitance presented to the video amplifier that is attributable to the kinescope cathode, socket, spark gaps, and related stray capacitances. A secondary undesired capacitance loading of the video amplifier is effectively reduced by regulating the collector-emitter voltages of the emitter follower output transistors at substantially constant values thereby improving parameters such as slew rate and bandwidth of the overall video display system. Nonlinear circuitry in the follower circuit facilitates accurate AKB current sensing and provides simplification of the voltage regulation circuitry. White limiting circuitry is included within the video amplifier for reducing excess peak white drive that results in objectionable smears.

Abstract: A first PLL circuit (100) receives a flyback pulse (VFB) as a reference signal and outputs a clock signal (CLK1), and a delay circuit (200) outputs a flyback delay signal (VFBD) having a predetermined delay time corresponding to the amount of horizontal movement on a screen. A second PLL circuit (300) receives a horizontal synchronizing signal (VHSYNC) and the flyback delay signal (VFBD) as a reference signal and a compared signal, respectively, and generates a horizontal drive pulse (VHD). A deflection yoke (12) receives the horizontal drive pulse (VHD) and generates a flyback pulse, and a step-down transformer circuit (16) outputs the flyback pulse (VFB) whose voltage is lowered. With this constitution, it becomes possible to generate a stable horizontal drive pulse which causes no jitter on the screen when a PIN balance correction, a KEY balance correction and a horizontal position adjustment of a CRT are performed by digital processing.

Abstract: Disclosed are methods for driving an electron-emitting device, an electron source, and an image-forming apparatus, driving circuits for an electron source and an image-forming apparatus, and an electron source and an image-forming apparatus, with each of which electron emission is effectively halted. A voltage (Vg−Vc)>0 is applied to an electron-emitting device placed in a driving state in which electrons should be emitted, thereby having the electron-emitting device emit electrons. A voltage (Vg−Vc)<0 is applied to an electron-emitting device placed in a halt state in which no electrons should be emitted, thereby having the electron-emitting device halt electron emission.

Abstract: The invention relates to a method and a device for reducing an electric field produced by display devices equipped with cathode ray tubes, in their surroundings. According to the invention, a part of a spectrum (ff), caused by a picture content, the level of which is separately adjusted, is discriminated from an interference voltage frequency spectrum (fs), produced by the display terminal and caused by deflection signals (fv, fh). Spurious pulses, significant for the generation of the electric field, are connected to a compensation circuit, wherein they are summed and supplied to a common emitter. The directions of the pulses are determined so that the electric field produced by the emitter reverses the field produced by the display device.

Abstract: A circuit for compensating a brightness level of a video display apparatus capable of simplifying a circuit configuration and reducing a cost of production by placing a brightness level compensation circuit for the video display apparatus is disclosed. Microprocessor memorizes a predetermined data for a brightness level compensation and outputs a data signal and a clock signal based on the data for the brightness level compensation. Video pre-amplifier receives a video signal and horizontal and vertical fly-back pulse signals from an outside and controls a contrast level and compensates a brightness level of the video signal in accordance with the data signal and the clock signal to output a compensated video signal. Accordingly, the design of the brightness level compensation circuit is simplified and the size of the printed circuit board is reduced.

Abstract: A system is described for testing the video output of a computer of the type in which a video output connector is provided with a data channel, such as a DDC channel, permitting data to be transmitted from a monitor connected to the video output connector to the computer. The system comprises test apparatus having a connector for connection to the video output connector of a computer under test, the test apparatus comprising means to measure parameters of test video signals received through the connector and means to generate a result signal from the measured parameters for transmission to the computer under test over the data channel. Software executing on the computer under test to generate the test video signals and to receive and process the result signal received over the data channel.

Abstract: A device for synchronizing a power drive signal of a monitor, and a method therefor.

Abstract: A video control circuit controls the gains for red(R), green(G), and blue(B) color video signals inputted to a monitor, the brightness and contrast of a video display on the monitor, and the bias of a cathode ray tube within the monitor. A microcomputer outputs, in an I2C manner, data for a control signal for controlling contrast, brightness, gain and/or bias. The data are inputted to an I2C data process/PWM signal generation section which converts the data to PWM signal outputs. Rectification sections rectify the PWM signal outputs to provide contrast, brightness, gain and cutoff voltage signals. Only two output terminals of the microcomputer are employed for outputting a clock signal and the data for the control signal so as to control contrast, brightness, gain and bias control signals according to output signals of the variable resistors VR11 and VR12 and a bias/grain control section. A clock signal is generated by the microcomputer in synchronization with the data DATA.

Abstract: A noise filter includes: a rectifier for receiving and rectifying a pulse output from a signal generator; and a CMOS logic IC for converting the rectified pulse output of the rectifier into a power source, and for filtering noise component mixed in the pulse output from the signal generator.

Abstract: A monitor control device for use in a CRT-type of monitor which receives video signals and synchronizing signals from a host computer and provides a visual display of information on a screen.

Abstract: A help service function control device is added to a multi-sync(or multi-modc)monitor of a personal computer. The control device uses a micro controller and an on-screen display to control a video display to show the contents of "Help Service". The help service contains Install. Adjustment and Specification instructions for instructing the user to install and adjust the monitor and to understand the specifications of the monitor. The micro controller picks up a serial signal from the on-screen display, permitting the fetched signal to be amplified by a video pre-amplifier and then displayed through the video display so as to help the user eliminate troubles.

Abstract: Electron gun for a color cathode ray tube, is disclosed, the color cathode ray tube having a plurality of cathodes for emitting electron beams, a first controlling electrode for controlling an amount of the electron beam emission, and an accelerating electrode for accelerating the electron beams, the electron gun including a power supplying part for examining a received video signal, determining a mode of the video signal, selecting a power of an appropriate level from a plurality of power levels according to a result of the determination, and supplying the selected power to the first controlling electrode and a second controlling electrode disposed between the cathodes and the first controlling electrode for controlling an emission radius of the electron beam according to the power of an appropriate level supplied to the first controlling electrode, thereby satisfying a high luminance as well as a high resolution requirements, whereby allowing processing of various modes of images with one electron gun and e

Abstract: A gradation converting process is carried out on an image signal and in accordance with a predetermined gradation converting table, and a visible image, which is represented by an image signal having been obtained from the gradation converting process, is displayed on an image displaying device. In the gradation converting process, the amount of depletion of luminance of the image displaying device is detected, and the gradation converting table is corrected in accordance with the detected amount of depletion of luminance such that the depletion of luminance of the image displaying device may be compensated for. A visible image having good image quality is thereby displayed on the image displaying device regardless of depletion of luminance of the image displaying device.

Abstract: The present invention relates to a method and system for optimizing the output of at least two electron guns in a cathode ray tube for aging the cathode ray tube during manufacture. The system comprises at least two electron guns located in the cathode ray tube and a memory configured to store an offset value that is representative of a difference between a maximum output level and a detected output level for each of the electron guns. The system further comprises a processor coupled to the memory. The processor generates a first scaled signal by adding a first signal representative of an input voltage corresponding to the detected output level of the first electron gun and an offset signal representative of the offset value, and a second scaled signal by adding a second signal representative of an input voltage corresponding to the detected output level of the second electron gun and the offset signal.

Abstract: A method and apparatus for providing non-DDC monitor characteristics to system software is disclosed. The present invention is primarily directed to use in personal computers. The method of the present invention includes obtaining information from a user regarding specific capabilities of an attached non-DDC monitor. This information is then stored in system storage in a format similar to that sent by a DDC monitor. A BIOS call from a video subsection receives this information when a DDC monitor is not attached and utilizes it to determine the proper refresh rate at which to set an attached video controller.

Abstract: A self-raster circuit of a monitor capable of providing color rasters to a cathode ray tube of the monitor if no video signal is inputted to the monitor from a computer. The self-raster circuit includes a detecting section for detecting whether or not a video signal is inputted to the monitor from the computer, and a control section for outputting a variety of pulse-width-modulated signals corresponding to predetermined colors to a video amplifying section of the monitor if it is detected by the detecting section that no video signal is inputted from the computer.

Abstract: A video display apparatus capable of communicating with an external controller includes a microcontroller for receiving commands from an external controller, a first non-volatile memory for storing data relating to the video display apparatus, first bus line for connecting the external controller with the microcontroller and the first non-volatile memory, a second non-volatile memory for storing the same data that is stored in the first non-volatile memory, and second bus lines for connecting the second non-volatile memory with the microcontroller.

Abstract: The synchronization signal processing circuit of a monitor for protecting the cathode ray tube includes a rectifying unit for rectifying a synchronization signal supplied from the outside; a first inverting unit for inverting the rectified signal and generating a first inverted signal; a control unit for controlling the output of the first inverted signal according to the synchronization signal by being switched on; a second inverting unit for delaying the rectified signal for a predetermined time period, inverting the delayed rectified signal, and generating a second inverted signal; and a synchronization signal outputting unit for buffering the first and second inverted signals and applying the buffer signal to a microprocessor, a video signal processor and a deflection circuit respectively. Accordingly, even while there is no input from the keyboard for a certain time period, the fluorescent screen of the CRT can be protected since the point of the screen to which the video signal is injected changes.

Abstract: A method and apparatus of adjusting the display of the monitor by modifying the parameter values of the adjustable display functions. When the user begins to press the select key on the control panel, the display of the monitor is altered by recursively varying the parameter value of the selected display function from the maximum to the minimum, for indicating the type of the display function to be selected. Such a dynamic display can be obtained by using the microcontroller of the monitor. The monitor will exhibit the display effect of the display function to be selected. Therefore, the user can realize the display effect of these display functions, without having to memorize the simplified figures associated with these display functions. Then the user can adjust the display of the monitor through depressing the adjust key on the control panel.

Abstract: A trace input device with function of informing the remaining power of the power supply is described. The device is provided with a remaining power measuring device, and the display form, such as the color or the width, of the entered trace is changed according to the measured remaining power, so that the remaining power can be securely recognized without particular display device.

Abstract: An image screen automatic adjustment apparatus for a video display monitor device is provided. The apparatus includes a microprocessor for handling the operation of the monitor device and for implementing the image screen adjustments. The monitor device has a switch for enabling the image screen automatic adjustment. Push button processor circuitry is coupled between the switch and the microprocessor for signalling to the microprocessor when the switch is enabled. Image inspection circuitry is coupled to the microprocessor for outputting horizontal and vertical image signals and horizontal front-back porch signals. When the image screen automatic adjustment switch is enabled, the image inspection circuitry provides the horizontal and vertical image signals and the horizontal front-back porch signals to the microprocessor for implementing an optimization analysis processing to obtain a set of optimized control parameters including a vertical size parameter V.sub.size, a vertical position parameter V.sub.

Abstract: A display monitor which has the monitor circuit 10 for driving the monitor 9 such as a cathode ray tube, the monitor control CPU 14, the EEPROM 11 which stores control data for monitor circuit 10, the RAM 12 which temporarily stores adjustment data of monitor circuit 10 necessary for a currently displayed image and the serial interface 8 which performs a data communication between the computer 1 and the monitor display 2. Based on a command received via the serial interface 8, the monitor control CPU 14 reads data in the EEPROM 11 and the RAM 12. Then, the monitor control CPU 14 sends the data to the computer 1 via the serial interface 8.

Abstract: A display control unit comprises plural display units having different display control methods, an input system for inputting an identifying signal relative to the display control method of the display unit and a display timing generator for changing a period of applying a display control signal in accordance with the identifying signal input by the input means. A control unit controls the display units having the display control method corresponding to the identifying signal by the display control signal applied by the display timing generator.

Abstract: A video monitor color control system including means for calibrating the intensity response of CRT phosphor sets to each of a plurality of electron gun control levels. Provided is a processor (24) that generates a sequence of discrete DAC signals, each DAC signal identifying an electron gun and a DAC value for driving the electron gun at a selected control level. Also provided is a monitor driver (22) connected to the processor (24) and to the monitor (20) and controllable in response to a DAC signal for driving the electron gun identified by the DAC signal at the control level identified by the DAC signal. The driven electron gun excites the associated phosphor set. A sensor (28) is provided for detecting the luminous intensity level of the phosphor excited by the electron gun, and for converting the detected intensity into a representative signal.

Abstract: A medical image displaying apparatus is provided with a display device, which reproduces a visible image from an image signal made up of a series of image signal components representing a medical image, and which displays the visible image. A conversion device receives a plurality of primary image signal components representing a medical image, each of the primary image signal components being composed of n bits, and converts them into a plurality of secondary image signal components representing an image with a desired gradation and having been compensated for gradation characteristics of the display device. Each of the secondary image signal components is composed of n+k bits, where k>0. The display device reproduces a visible image from the plurality of the secondary image signal components and displays it.

Abstract: A digital engine analyzer has an oscilloscope display and is controlled by microprocessors operating under menu-driven stored program control. The analyzer receives analog input signals from an engine being analyzed. The analyzer is provided with a scanner interface, so that a scanner designed to read data from a vehicle on-board computer, can transfer this data to the analyzer for display on the analyzer oscilloscope. The analyzer processor, when operating in the scanner interface mode, operates under stored program control to reconfigure analyzer keyboard and soft key functions to duplicate scanner control functions, so that the scanner control functions can be effected from the analyzer.