Abstract: An optical communication device is provided. The optical communication device includes at least one light source and a controller configured to continuously control, by a light source control signal, each of the at least one light source to operate in at least two modes. The at least two modes include a first mode and a second mode. The first mode is used to transfer a first information, and the second mode is used to transfer a second information different from the first information. For any one of the at least one light source, in the first mode, the light source control signal has a first frequency so that a stripe presents in a first image of the light source obtained when the light source is photographed by a CMOS image sensor, and in the second mode, a second image of the light source obtained when the light source is photographed by the CMOS image sensor is substantially free from any stripe.

Abstract: A driver interface for a switch-based circuit includes an AC coupling capacitor, a first diode or a first series of diodes, and a second diode or a second series of diodes connected in series with the first diode or first series of diodes but with an opposing polarity. The AC coupling capacitor removes a DC voltage from an input bi-level drive signal that does not have the appropriate high and low drive levels needed to switch a FET in the switch-based circuit between fully ON and fully OFF states. The first diode or first series of diodes and the second diode or second series of diodes clamp the resulting AC-coupled drive signal to produce an output bi-level drive signal having the high and low drive levels needed to switch the FET between fully ON and fully OFF states. The driver interface maintains the high and low drive levels of the output bi-level drive signal irrespective of any changes made to the duty cycle or pulse density of the input bi-level drive signal.

Abstract: The present invention provides a system and related devices, systems and methods to enable the controlled and predictable emission of electromagnetic radiation from objects that previously were impossible or impractical to utilize as electromagnetic emitters or to place electromagnetic emitters on. The present invention includes addressable electromagnetic emitter “elements”, a plurality of which is applied as a continuous surface coating or is otherwise integrated with one or more three dimensional objects (the “subject”). Said plurality of elements (“array of elements”) is controlled by an array controller which accepts electrical input signals, generates and transmits, by means of a shared transmission medium, corresponding control signals to elements in the array.

Abstract: A projector includes a screen having a periodic array of color stripes for producing visible light depending on incident light, a light source that remits a light beam, a projection unit that scans an area of the screen where the color stripes are disposed, with the light beam in a direction across the color stripes, to display an image on the screen, a detector that detects the visible light from each of the color stripes as a feedback light pulse, and a controller that adjusts a start-of-emission timing of the light source based on a start-of-detection timing at which the feedback light pulse is detected by the detector and a detection period during which the feedback light pulse is detected by the detector, and controlling the light source to emit the light beam in order to apply light pulses to the color stripes within boundaries thereof.

Abstract: An image displaying device includes laser beam sources that emit laser beams of mutually differing color components. The image display device projects an image based on a test pattern that includes a reference mark indicating horizontal and vertical reference positions by a mixed color of color components of the mutually differing color components, and bar marks arranged at specific intervals in the horizontal and vertical directions relative to the reference mark, for each color component, is used. Arrangement of the bar marks in the image data is an arrangement in which a distance from the reference mark is used as a reference, and for pairs of bar marks for bar marks of mutually differing color components, an amount of offset between bar marks in each of the bar mark pairs increases with fixed increments proportional to the distance from the reference mark.

Abstract: A display apparatus includes a plurality of light sources which emit light beams, a plurality of optical waveguides which guide the light beams, a plurality of scanning lines which are arranged so as to intersect with the optical waveguides, a plurality of light output elements which, at intersections of the optical waveguides and the scanning lines, output the light beams guided in the optical waveguides by electric signals from the scanning lines, and a scanning line driving unit which drives the scanning lines in a direction opposite to a direction in which the light beams are guided.

Abstract: Disclosed herein is a display apparatus, including: a pixel array section including a plurality of pixels, a writing transistor, a driving transistor, a first switching transistor, a holding capacitor, and a second switching transistor; a first scanning section configured to drive the writing transistor in a unit of a row of the pixels; a second scanning section configured to drive the switching transistors in synchronism with scanning by the first scanning section; and a third scanning section configured to control the second switching transistors to a non-conducting state within a period after the image signal is written by the writing transistor until the signal writing period of the same row of the pixels ends but to a conducting state within any other period.

Abstract: In a Q-tuple anode matrix vacuum fluorescent display (VFD), a plurality of selected pixels are turned on one by one to sequentially emit lights in accordance with a display signal. Each selected pixel is selected from Q anode segments to be turned on to emit lights by turning on a first and a second grid electrode positioned adjacent to each other. Each selected pixel is formed of Q/2 anode segments in total including R anode segments sequentially disposed from a position closest to the first grid electrode and facing the second grid electrode and (Q/2?R) anode segments sequentially disposed from a position closest to the second grid electrode and facing the first grid electrode, R being an integer ranging from 1 to (Q/2?1).

Abstract: A flat panel display including a plurality of electrically addressable pixels; using a passive matrix on a first substrate, a passivating layer on at least partially around the pixels; a conductive frame on the passivating layer, and a plurality of cold cathode emitters on select portions of the conductive frame within the display, wherein exciting the conductive frame and addressing one of the pixels using the associated passive matrix causes electrons to strike at least one of the pixels and result in the emission of light from those pixels. Using a metal layer (ML) on a second substrate the extent of electrons emitted is enhanced through the incorporation of a noble gas or mixture thereof, causing a multiplication of the electrons emitted by the cold cathode when the gas is ionized.

Abstract: A system for operating a color flat panel display (FPD) is provided that includes a color FPD, a light source, and a display processing device. The color FPD has an adjustable color depth and is configured to reflect ambient light. The light source transmits light through the bottom surface of the color FPD. The display processing device is coupled to the color FPD and decreases the color depth of the color FPD when the light source is activated and increases the color depth of the color FPD when the light source is turned off.

Abstract: Scanning beam display systems using fluorescent screens and various servo feedback control mechanisms to control display imaging qualities.

Abstract: Methods and systems for improving imaging quality and power efficiency of scanning beam display systems using fluorescent screens are disclosed. In various embodiments, beam shaping mechanisms for maximizing overlap between the beam cross-section and the florescent element corresponding to each color sub-pixel of the screen, as well as pulse width and timing adjustments, are introduced to reduce imaging noise and improve power efficiency of the display system.

Abstract: Luminance life can be enhanced in a vacuum fluorescent display that is driven according to a dynamic drive scheme and that uses a phosphor having remarkable luminance saturation. A drive method for a vacuum fluorescent display, having causing a phosphor layer formed on an anode to display under low-energy electron excitation by the dynamic driving, wherein the phosphor included in the phosphor layer is a phosphor in which the luminance increases when a pulse width is reduced under conditions in which the Du is kept the same in the dynamic driving, and in which, after a voltage is applied to the anode and the luminance of the phosphor is saturated, the time at which the luminance value decreases to 10% of the saturation luminance value following stoppage of the voltage application is 200 ?sec or more; and wherein the pulse width and pulse repetition period in the dynamic driving are made variable in the direction of maintaining the initial luminance of the phosphor as driving time elapses.

Abstract: In a Q-tuple anode matrix vacuum fluorescent display (VFD), a plurality of selected pixels are turned on one by one to sequentially emit lights in accordance with a display signal. Each selected pixel is selected from Q anode segments to be turned on to emit lights by turning on a first and a second grid electrode positioned adjacent to each other. Each selected pixel is formed of Q/2 anode segments in total including R anode segments sequentially disposed from a position closest to the first grid electrode and facing the second grid electrode and (Q/2?R) anode segments sequentially disposed from a position closest to the second grid electrode and facing the first grid electrode, R being an integer ranging from 1 to (Q/2?1).

Abstract: An image display apparatus includes a rear plate provided with a plurality of electron-emitting devices, each electron-emitting device emitting electron; a face plate disposed opposite the plurality of electron-emitting devices and provided with a plurality of pixels of phosphor, each pixel of phosphor being irradiated with electrons emitted from corresponding ones of the electron-emitting devices to generate light; and a driver for scanning the plurality of electron-emitting devices for emitting electron from the plurality of electron-emitting devices. The phosphor has luminescence center of allowed transition type material, and the driver scans the plurality of electron-emitting devices so that maximum of charge density dosed in one pixel phosphor, during one scanning period, is equal to or larger than 3×10?8 C/cm2.

Abstract: A system for operating a color flat panel display (FPD) is provided that includes a color FPD, a light source, and a display processing device. The color FPD has an adjustable color depth and is configured to reflect ambient light. The light source transmits light through the bottom surface of the color FPD. The display processing device is coupled to the color FPD and decreases the color depth of the color FPD when the light source is activated and increases the color depth of the color FPD when the light source is turned off.

Abstract: The invention provides display control circuits for Vacuum Fluorescent Displays (VFDs). The display control circuit controls a plurality of display units of the VFD and comprises an image signal generator generating a plurality of image signals, a clock signal generator generating a clock signal, and a plurality of control signal generators. Each control signal generator receives one of the image signals and the clock signal, generates a control signal for one of the display unit, and determines the duty cycle of the control signal according to the received image signal and the clock signal. The brightness of one display unit varies with the duty cycles of the corresponding control signal. The clock signal generator comprises a plurality of flip-flops coupled in series and a plurality of logic gates.

Abstract: There is provided an image display apparatus including: a first correction unit for outputting data to determine a lighting time of a first pixel on the basis of data to indicate luminance of the first pixel, wherein the first correction unit carries out first correction to compensate a loss of the luminance of the first pixel; and a second correction unit for outputting data to determine a lighting time of a second pixel on the basis of data to indicate luminance of the second pixel, wherein the second correction unit carries out second correction to compensate a loss of the luminance of the second pixel by predicting a lighting state of the first pixel that is corrected by the first correction.

Abstract: The distance between filamentary cathodes and a phosphor on an anode substrate can be reduced by shortening the distance between the filamentary cathodes and a grid. To obtain high luminance without loss of display quality, the present invention provides a vacuum fluorescent display (1) with a driver IC, comprising a display unit (3) provided with a phosphor layer on an anode substrate (2), a plurality of filamentary cathodes (5), a grid (4), a driver IC (6), and a filament support (7) for shielding the IC and supporting an end part of the filamentary cathodes. The end part of the filamentary cathodes is fixed to one short side of the vacuum fluorescent display at a long side of the filament support. Depressions are provided to a surface of the filament support, or slits are provided to the filament support.

Abstract: A method of and an apparatus for image enhancement taking ambient illuminance into consideration. The image enhancement method includes calculating an original-luminance contrast which is a luminance contrast with respect to an original-luminance of pixels forming an original image, calculating a fade-luminance by reflecting the variation of perceived luminance based on an ambient illuminance into the original-luminance, calculating a defade-luminance by converting the fade-luminance to maintain the original-luminance contrast, and calculating a display-luminance by reflecting the variation of perceived luminance by the ambient illuminance into the defade-luminance. Improving luminance contrast through adjustment of luminance based on ambient illuminance, effectively reduces the fade phenomenon.

Abstract: The present invention provides a vacuum fluorescent display driving apparatus and a vacuum fluorescent display driving method that may prevent generation of excessive load on power lines employed in driving, without causing an increase in size of the apparatus. The vacuum fluorescent display driving apparatus of the present invention includes, a grid driver that applies a driving voltage to plural grid electrodes respectively provided in the vacuum fluorescent display, and a grid driver limiting section that performs limitation on the number of grid electrodes to which voltage is applied simultaneously by the grid driver, to less than a predetermined first threshold value.

Abstract: Methods and systems for improving imaging quality and power efficiency of scanning beam display systems using fluorescent screens are disclosed. In various embodiments, beam shaping mechanisms for maximizing overlap between the beam cross-section and the florescent element corresponding to each color sub-pixel of the screen, as well as pulse width and timing adjustments, are introduced to reduce imaging noise and improve power efficiency of the display system.

Abstract: The present invention discloses a fluorescent display apparatus and a method for driving the same. In accordance with the apparatus and the method, a display data outputted from a display controller 10 is converted by and stored in a shift register 11 and a latch circuit 12. While a data outputted from gate circuits A1-Ak is set to have a blanking period and displayed by a fluorescent display 14, a second display data outputted from gate circuits Ak+1-An is provided to a selector 16 to be outputted as a control data for a second emitting means. The second data may be outputted to have a different brightness from the fluorescent display 14 by a port switching signal provided to the selector 16.

Abstract: An electron emission display and a driving method thereof adjust a brightness differently according to a brightness of a frame in order to reduce power consumption and prevent a gradual failure from occurring, and easily recognize a change of the brightness. A pixel portion receives a data signal and a scan signal, and displays an image. A data driver generates the data signal using video data and transfers the data signal to the pixel portion. A scan driver transfers the scan signal to the pixel portion. A timing controller transfers a drive signal to drive the data driver and the scan driver, to the data driver and the scan driver. A data processor generates a control signal corresponding to frame data obtained by summing a value of video data inputted during one frame. A power supply section generates a drive voltage and transfers the drive voltage to the pixel portion, the data driver, the scan driver, the timing controller, and the data processor.

Abstract: The invention provides an image display apparatus and an image display method of excellent image quality, by correcting the voltage drop resulting from the electrical resistance of the wirings with a simple configuration. There are provided adjustment data calculation means for calculating, for input image data, adjustment data for correcting the influence of the voltage drop resulting from the electrical resistance of the row wirings and gray scale number converting means for converting the number of gradation levels of the adjustment data. Modulation means outputs a signal modulated in the voltage amplitude to each column wiring, based on the adjustment data outputted by and subjected to the conversion of gradation levels by the gray scale number converting means.

Abstract: A method of controlling display of a grey level at an associated image point on a matrix display screen. The screen includes lines and columns for which the intersections form an image point. Samples with non-linear proportional light intensity are used to display grey levels, instead of using samples with linear proportional light intensity, by selecting a coding that matches the response curve of the human eye because the eye is more sensitive to brightness differences at a low illumination level than at a high level. Its perception of brightness follows a non-linear law called the gamma correction law which in particular has been modelled by the International Lighting Commission (ILC).

Abstract: Scan electrode potential detected by a feedback switch is inputted into a negative-phase input terminal of an amplifier, reference selection potential from a reference-selection-potential-signal generation circuit is inputted into a positive-phase input terminal of the amplifier, and the reference-selection-potential-signal generation circuit delays reference potential of a reference voltage source, thereby scan electrode potential without overshooting components can be achieved.

Abstract: An EED capable of reducing noise influence between a high voltage element and a low voltage logic element in an EED panel includes: a high voltage ground for a high voltage element, a low voltage ground for a low voltage element, and a ferrite bead, connected between the high voltage ground and the low voltage ground, to block RF noise from the high voltage ground.

Abstract: A Liquid Crystal Display (LCD), a backlight used for the LCD and a method for producing the LCD and the backlight are provided which are capable of inhibiting an increase in component counts and in assembling processes and of reducing them, thereby achieving low costs. A display image is obtained by arranging a backlight section being able to perform scanning as a single unit in a manner that it positionally matches a liquid crystal displaying section. The backlight section is provided with a plurality of scanning electrodes and light emitting layers each providing a different luminescent color, and being spatially separated from each other on a principal face of the backlight and scanning is performed on a plurality of light emitting layers providing a different luminescent color.

Abstract: A display device driver constructed of scanning selection switches corresponding to a plurality of scanning wiring lines, a non-selection switch which brings the scanning wiring line into a non-selected state, a feedback switch which detects a scanning electrode potential and a negative feedback amplifier which sets the scanning electrode potential to a predetermined potential every electrode based on the scanning electrode potential detected by the feedback switch, and a time constant formed of a combined capacitance of a capacitance of the feedback switch and a wiring line capacitance and a feedback switch resistance is set to be smaller than that of a display panel capacitance and a scanning selection switch resistance.

Abstract: A vacuum fluorescent display driving circuit is disclosed. The vacuum fluorescent display driving circuit is used for driving a vacuum fluorescent display to avoid unusual displaying caused by coupling of the vacuum fluorescent display. The vacuum fluorescent display driving circuit includes a first output pin set and a second output pin set. The first output pin set includes a plurality of first output pins and each of them includes two metal oxide semiconductor transistors, the second output pin set includes a plurality of second output pins and each of them includes a metal oxide semiconductor transistor and a resistor. No coupling effect will take place when the first output pin set and the second output pin set operate in the vacuum fluorescent display driving circuit.

Abstract: An Electron Emission Display (EED) device, adapted to of adjust a pulse width of data signal according to an active pulse width of a horizontal synchronization signal, includes: a scan driver, a data driver; an EED panel displaying display data; a reference signal memory adapted to store a lookup table of active pulse widths of horizontal synchronization signals defined by a system clock and reference signals corresponding to the active pulse widths of the horizontal synchronization signals; a reference signal referring unit adapted to output a reference signal in accordance with the lookup table stored in the reference signal memory; and a gray level signal generator adapted to count the reference signal and output a gray level signal to the data driver, the data driver outputting video data corresponding to the gray level signal to data electrode lines of the EED panel.

Abstract: An electron emission display device is provided having a light source unit including a plurality of cathode electrodes and a plurality of gate electrodes crossing the plurality of cathode electrodes. The light source unit emits electrons corresponding to voltages of the gate electrodes and the cathode electrodes and allows the emitted electrons to collide with a phosphor on an anode electrode to emit light. A gate driver generates a gate signal and transmits the gate signal to at least one of the gate electrodes. A cathode driver generates a cathode driving signal corresponding to an image signal and transmits the cathode driving signal to the cathode electrode. The cathode driving signal is transmitted in a plurality of pulse waveforms within one vertical synchronization period.

Abstract: The invention provides display control circuits for Vacuum Fluorescent Displays (VFDs). The display control circuit controls a plurality of display units of the VFD and comprises an image signal generator generating a plurality of image signals, a clock signal generator generating a clock signal, and a plurality of control signal generators. Each control signal generator receives one of the image signals and the clock signal, generates a control signal for one of the display unit, and determines the duty cycle of the control signal according to the received image signal and the clock signal. The brightness of one display unit varies with the duty cycles of the corresponding control signal. The clock signal generator comprises a plurality of flip-flops coupled in series and a plurality of logic gates.

Abstract: Methods for compensating for brightness variations in a field emission device. In one embodiment, a method and system are described for measuring the relative brightness of rows of a field emission display (FED) device, storing information representing the measured brightness into a correction table and using the correction table to provide uniform row brightness in the display by adjusting row voltages and/or row on-time periods. A special measurement process is described for providing accurate current measurements on the rows. This embodiment compensates for brightness variations of the rows, e.g., for rows near the spacer walls. In another embodiment, a periodic signal, e.g., a high frequency noise signal, is added to the row on-time pulse in order to camouflage brightness variations in the rows near the spacer walls. In another embodiment, the area under the row on-time pulse is adjusted to provide row-by-row brightness compensation based on correction values stored in a memory resident correction table.

Abstract: A driving circuit for a vacuum fluorescent display having a filament, a grid electrode and a segment electrode, the driving circuit comprising a filament driving unit for driving the filament; a grid driving unit for pulse-driving the grid electrode; and a segment driving unit for pulse-driving the segment electrode, wherein the driving circuit comprises a controlling unit for validating or invalidating the output of the filament driving unit at a proper timing.

Abstract: A driving circuit for a vacuum fluorescent display for pulse-driving a filament of the vacuum fluorescent display with a pulse voltage. The driving circuit comprises a detecting unit for detecting that the level of the pulse voltage is fixed, and outputs a detection signal indicative of the result of the detection. Preferably, the driving circuit comprises a control unit for controlling at least one output of the outputs of the filament driving unit, the grid driving unit and the segment driving unit in order to terminate the driving of at least one of the filament, the grid electrode and the segment electrode, based on the detection signal.

Abstract: An electron emission display includes a display panel having a first substrate on which at least one first electrode is formed, a second substrate on which a second electrode and a third electrode on which an electron emission source is formed are formed. A fourth electrode is formed between the first and second substrates to focus towards a corresponding phosphor surface area on the at least one first electrode the electrons emitted by the electron emission source towards a corresponding phosphor surface area on the at least one first electrode, the second electrode being insulated from the third electrode and crossed therewith. A scan electrode driver applies scan pulses to the second electrode. A data electrode driver applies data pulses to the third electrode. A focusing electrode driver applies focusing voltages to the fourth electrode. The focusing electrode driver applies different voltages according to image displayed states on the display panel.

Abstract: An electron emission device (EED) includes a display panel, first and second electrode drivers, and a controller. The display panel includes first electrodes in the column direction, second electrodes in the row direction, and an electron emission source. The first and the second electrode drivers drive the first and the second electrodes. The controller receives first vertical and horizontal synchronous signals and an input signal including video data, regenerates a first vertical synchronous signal and a second horizontal synchronous signal according to a blank-time information of a blank-time for representing no gray scales of an image and an on-time information of an on-time for representing the gray scales thereof, generates the drive signal for driving the display panel based on the regenerated second vertical and horizontal synchronous signals, and outputs them to the first and second electrode drivers.

Abstract: An image display device which prevents damage to an electron-emitting device from discharge between a faceplate and a rear plate is provided. A conductive plate 12 including a transparent conductive film is formed over a surface of a substrate 11, a distance specifying member 13 having a plurality of openings is formed on the conductive area 12, a fluorescent material 14 is arranged in the opening, and a conductive film 15 is arranged on the fluorescent material 14 to for a face plate. A resistance Rx between the adjacent conductive films 15 is set larger than a resistance Rz, between the conductive film 15 and the conductive area 12. Discharge current generated between each conductive film 15 and a rear plate 21 is caused to flow into the conductive area 12 by applying anode voltage to the conductive area 12, which suppresses influence on an electron-emitting device 23.

Abstract: A driving circuit for a vacuum fluorescent display having a filament, a grid electrode and a segment electrode, comprising a grid driving unit for pulse-driving the grid electrode, a segment driving unit for pulse-driving the segment electrode, a first controlling unit for rendering adjustable the duty ratio of the output of the grid driving unit, a second controlling unit for rendering adjustable the duty ratio of the output of the segment driving unit, and a selecting unit for selecting the first controlling unit and/or the second controlling unit.

Abstract: An active matrix display device includes a CPU; a glass substrate; and a display panel unit formed on the glass substrate, the display panel unit including a control unit and a display section together. The display panel unit is provided with a data input terminal, a clock terminal and a data latch terminal, which are connected to the CPU, a test terminal to which a test signal from the CPU is inputted, and a data output terminal for outputting data written to the display section upon input of the test signal. The display panel unit may be further provided with a write enable terminal for receiving a write control signal; and a blank terminal for adjusting brightness of the display section.

Abstract: Scanning beam display systems using fluorescent screens and various servo feedback control mechanisms to control display imaging qualities.

Abstract: An illumination device for a display instrument is described which is used to illuminate two sets of scale markings and to separately illuminate a pointer scale of the display instrument. The light from a light source is guided past light funnels that are used to illuminate the pointer scale by an optical waveguide. This provides an efficient and economical means of illuminating a display instrument of this type.

Abstract: A multiplex anode matrix fluorescent display capable of allowing a duty cycle thereof to be multiple times that of the prior art multiplex anode matrix fluorescent display is provided without changing the structure of the prior art multiplex anode matrix fluorescent display.

Abstract: Field emission displays (FEDs) having improved structure are provided. In one implementation, a field emission display comprises a faceplate, a backplate, a volume formed therebetween and maintained as a vacuum, a cathode and an anode. A thickness of the faceplate and the backplate are sufficient to prevent deformation of the faceplate and the backplate across their dimensions due to the vacuum such that spacers are not needed to maintain a uniform separation between the anode and the cathode. In an alternative implementation, the volume includes a first portion between the cathode and the anode and a second portion between the cathode and the backplate, the second portion continuous with the first portion. The second portion provides an improved volume to surface area ratio, which improves vacuum quality and which allows for improved gettering, which again allows for improved vacuum quality and longer display lifetime.

Abstract: A display apparatus, that includes current driving type luminescent elements, has a driving system that takes the conduction types of TFTs to control the emission of the luminescent elements into consideration. In order to reduce driving voltage and improve display quality simultaneously, the arrangement is provided such that if the second TFT which performs the “on-off” function of the current for the luminescent element is of an N channel type, the potential of the common power supply line (“com”) is lowered below the potential of the opposite electrode (“op”) of the luminescent element to obtain a higher gate voltage (“Vgcur”).

Abstract: An image-forming apparatus includes an image-forming device in an envelope. The image-forming device includes a member (e.g., a thin film electrode) which is carried on the inner surface of the envelope and is adapted to application of electron-accelerating voltage Va. The member-carrying part, such as a transparent face plate, of the envelope also includes on its outer surface a structure for applying a voltage substantially equal to the voltage Va (e.g., an electroconductive layer connected to the thin-film electrode by way of a certain resistance). The electric field across the part is significantly reduced to thereby prevent migration of sodium ions contained in the part, which can be made of soda lime glass.

Abstract: A driving circuit for a vacuum fluorescent display having a filament, a grid electrode and a segment electrode, comprising a grid driving unit for pulse-driving the grid electrode, a segment driving unit for pulse-driving the segment electrode, a first controlling unit for rendering adjustable the duty ratio of the output of the grid driving unit, a second controlling unit for rendering adjustable the duty ratio of the output of the segment driving unit, and a selecting unit for selecting the first controlling unit and/or the second controlling unit.

Abstract: A driving circuit for a vacuum fluorescent display for pulse-driving a filament of the vacuum fluorescent display with a pulse voltage. The driving circuit comprises a detecting unit for detecting that the level of the pulse voltage is fixed, and outputs a detection signal indicative of the result of the detection. Preferably, the driving circuit comprises a control unit for controlling at least one output of the outputs of the filament driving unit, the grid driving unit and the segment driving unit in order to terminate the driving of at least one of the filament, the grid electrode and the segment electrode, based on the detection signal.