Abstract: To improve communication between a wearer of a Head Mount Display (HMD) while wearing the HMD and a non-wearer of the HMD, provided is a head mounted display, including a display unit configured to present an image to a wearer, a mounting unit configured to be mounted on a head of the wearer, and a notification unit configured to notify a person other than the wearer of information that the wearer is visually recognizing.

Abstract: A handheld display apparatus including a display unit that displays an image includes a handheld grip portion including a plurality of bar members to be gripped by a user, and an operation unit that receives a manual operation and generates a control signal for the handheld display apparatus, the operation unit arranged on either at least one of the plurality of bar members or in proximity to at least one of the plurality of bar members.

Abstract: This disclosure concerns an interactive head-mounted eyepiece with an integrated processor for handling content for display and an integrated image source for introducing the content to an optical assembly through which the user views a surrounding environment and the displayed content. The eyepiece includes an adjustable wrap around extendable arm comprising a shape memory material for securing the position of the eyepiece on the user's head, wherein the extendable arm extends from an end of an eyepiece arm.

Abstract: A display device of the disclosure includes a projector including optical elements to project images on left or right eye of an observer and a frame connected to the projector for mounting on the observer. With the frame mounted on the observer, at least part of the projector is placed in visual fields of the eyes, and length from tangent point between leftmost one among lines of sight of the left eye overlapping outline of at least the part and the outline to intersection between an imaginary line through the tangent point parallel to direction of pupillary distance of the observer and rightmost one among lines of sight of the right eye overlapping the outline is shorter than the pupillary distance in a top plan view of the display device.

Abstract: A driving method of a liquid crystal display panel having a source line and a counter electrode, includes driving the counter electrode to a first potential, driving the, counter electrode to a second potential being different from the first potential, setting the counter electrode and the source line to a third potential by short-circuiting the counter electrode and the source line to an interconnection having a potential between the first potential and the second potential, and driving the source line to a potential corresponding to an image data. The setting of the counter electrode and the source line to the third potential occurs in a period of one frame.

Abstract: An electrophoretic display device has an electrophoretic display panel that has a plurality of drive electrodes, a common electrode, and a plurality of electrophoretic particles disposed between the drive electrodes and the common electrode. The device also has a drive control unit including components for setting the display color and applying pulses to update the display color to a first color, a second color, or an intermediate color between the first and second colors. The first or second color is displayed by applying a first or second pulse respectively. The first and second pulses are opposite in polarity to maintain DC balance. A method of driving such a device is also provided.

Abstract: A panel driving circuit that produces a panel test pattern and a method of testing a panel are provided. The driving circuit includes a pattern generation unit and a selection unit. The pattern generation unit responds to a system clock and produces pattern test data and pattern test signals. The selection unit responds to a test signal and selects and outputs either (a) the pattern test data and the pattern test signals that are outputted from the pattern generation unit, or (b) the pattern test data and pattern test signals that are directly applied from the outside. The driving circuit and the method of the panel test generates the panel test data, the horizontal synchronizing signal, the vertical synchronizing signal, and the data activating signal within the driving circuit using a system clock so that the testing of the panel can be carried out without using a separate test device.

Abstract: The invention relates to a display device and to a method of controlling a display device. A display device with a plurality of pixels arranged in rows n and columns m is presented so as to render possible an energy saving through charge sharing in the display device, in particular an active matrix display, in which the pixels can be activated via control lines (6), and with a row driver circuit (4) for driving the n rows with a row voltage (Vrow), wherein the rows of the display device can be consecutively selected from 1 to n, and with a column driver circuit (3) for driving the m columns with a column voltage (Vcol) corresponding to the picture data of the pixels (8) of the selected line to be displayed, and wherein it is provided for a transition from a selected row n to another row n+1 that the row voltage (Vrow) is connected to an intermediate voltage level (VZ), and the row n+1 is first connected to the intermediate voltage level (VZ) and subsequently is charged up to the required row voltage (Vrow).

Abstract: A liquid crystal display apparatus is able to display high quality motion pictures with less after-image when displaying motion pictures and with less fuzzy images without making the response speed of the liquid crystal too fast. The display data emphasized excessively more than a changed value is written into the pixel having any change detected by comparison with the previous display data and its value is made to change excessively more than the value corresponding to its original display data, and then, according to the optical response of the liquid crystal, the lighting time and the lighting period of the light source are controlled for the individual areas of the illumination unit having plural areas.

Abstract: A liquid crystal display and a method of driving the same are disclosed. The liquid crystal display includes a liquid crystal display panel including data lines and gate lines crossing each other and liquid crystal cells, a timing control signal generating unit, a data drive circuit supplying a data voltage to the data lines, and a gate drive circuit. The timing control signal generating unit generates a first gate timing control signal for controlling a scan direction of the liquid crystal display panel in a sequential direction and a second gate timing control signal for controlling the scan direction in a reverse sequential direction. The gate drive circuit supplies a gate pulse to the gate lines while a shift direction of the gate pulse changes in response to the first and second gate timing control signals.

Abstract: For the purpose of providing a display apparatus capable of improving display quality by expanding the light-emission area of pixels by improving the layout of pixels and common power-feed lines formed on a substrate, pixels (7A, 7B) including a light-emission element (40), such as an electroluminescence element or an LED element, are arranged on both sides of common power-feed lines (com) so that the number of common power-feed lines (com) is reduced. Further, the polarity of a driving current flowing between the pixels (7A, 7B) and the light-emission element (40) is inverted so that the amount of current flowing through the common power-supply lines “com” is reduced.

Abstract: A driving method for driving an LCD panel having a counter electrode and a source line. In a first period, the counter electrode is driven to a potential VCOMH. In a second period, the counter electrode and the source line are short-circuited to a power supply interconnection having a power supply potential VCI. In a third period, the counter electrode is connected to a ground interconnection while the source line is kept to be short-circuited to the power supply interconnection. In a fourth period, the counter electrode is pulled down to a potential VCOML lower than a ground potential In a fifth period, the source line is driven to a potential corresponding to an image data while the counter electrode is kept to the potential VCOML. The electric power consumed in pulling down the counter electrode from a positive potential to a negative potential can be effectively reduced.

Abstract: A liquid crystal display and a method for driving the same are disclosed. The liquid crystal display includes a timing controller generating a polarity control signal. A logic inverting period of the polarity control signal during frame periods ranging from an Nth frame period among M frame periods to 2 to 4 frame periods following the Nth frame period is longer than a logic inverting period of the polarity control signal in the other frame periods, where N is an integer equal to or larger than 4 and M is larger than N. The liquid crystal cells in one frame period of the M frame periods are charged to the data voltage whose a polarity is opposite to a polarity of the data voltage in a previous frame period of one frame period.

Abstract: Provided is a method of driving a display element in which color tone variation of white during repeated drive has been reduced. Also disclosed is a method of driving a display element in which an electrolyte comprising silver or a compound containing silver in a chemical structure thereof is contained between facing electrodes, comprising the step of applying a driving operation to the facing electrodes so as to induce dissolution and deposition of silver, wherein an impression necessary for displaying black color is the impression of a pulse applied to the facing electrodes, satisfying the following Expression (1). Expression (1) 1/100 ?TBP/TW?1/5, where TBP represents time width (ms) of one pulse applied in an applied direction necessary for black display, and TW represents the sum of applied time (ms) in an applied direction necessary for white display after conducting the black display employing the applied pulse.

Abstract: A source driver which can control the spatial cycle of inverting the polarity of offset voltage in response to the spatial cycle of inverting the polarity of data signal. The liquid crystal display device according to the present invention has an LCD panel, having data lines, and source drivers for supplying data signal to the data lines. The source driver includes an offset cancel control circuit for generating an offset cancel control signal and an amplifier used for generating the data signal, which is configured so as to invert the polarity of the offset voltage in response to the offset cancel control signal OCC. The offset cancel controller circuit receives the pattern select signal PSEL specifying the cycle of inverting the polarity of the offset voltage of the amplifier to generate the offset cancel control signal in response to the pattern select signal PSEL.

Abstract: A panel driving circuit that produces a panel test pattern and a method of testing a panel are provided. The driving circuit includes a pattern generation unit and a selection unit. The pattern generation unit responds to a system clock and produces pattern test data and pattern test signals. The selection unit responds to a test signal and selects and outputs either (a) the pattern test data and the pattern test signals that are outputted from the pattern generation unit, or (b) the pattern test data and pattern test signals that are directly applied from the outside. The driving circuit and the method of the panel test generates the panel test data, the horizontal synchronizing signal, the vertical synchronizing signal, and the data activating signal within the driving circuit using a system clock so that the testing of the panel can be carried out without using a separate test device.

Abstract: A method for driving a high-pressure gas discharge lamp of a projector system, which is suitable to produce and to supply to a light valve device during a projection interval (4) a light beam of a basic color which is selected from several basic colors (G, R, B). The lamp is driven by a lamp current. During said projection interval light valves of the light valve device are controlled in a pulse width modulation manner to have each valve provide a respective wanted light integral over said projection interval. During at least one of a number of successive projection intervals associated with one basic color a magnitude of the lamp current is temporarily reduced for at least a time that all light valves can be controlled for said one basic color.

Abstract: A driving method for a liquid crystal display is provided. A pre-charge voltage value is applied to a scan line, where the voltage level does not manage to turn on the thin film transistor of the associated pixel, before a scan signal is applied to the scan line of the liquid crystal display. The pre-charge voltage level is electrically connected to the pixel voltage of the scan line via a storage capacitor to the neighboring pixel.

Abstract: A panel driving circuit that produces a panel test pattern and a method of testing a panel are provided. The driving circuit includes a pattern generation unit and a selection unit. The pattern generation unit responds to a system clock and produces pattern test data and pattern test signals. The selection unit responds to a test signal and selects and outputs either (a) the pattern test data and the pattern test signals that are outputted from the pattern generation unit, or (b) the pattern test data and pattern test signals that are directly applied from the outside. The driving circuit and the method of the panel test generates the panel test data, the horizontal synchronizing signal, the vertical synchronizing signal, and the data activating signal within the driving circuit using a system clock so that the testing of the panel can be carried out without using a separate test device.

Abstract: A display controller in a computer system controls the asynchronous output of graphics display data in a computer system having at least one fixed resolution flat panel display. Fixed panel displays may have problems displaying non-native resolutions particularly at lower resolutions. The controller of the present invention uses a time base converter, horizontal and vertical Discrete Time Oscillators (DTO), and polyphase interpolator, which may be Discrete Cosine Transform (DCT)-based to expand graphics display data asynchronously from native resolution to at least one resolution suitable for display on a fixed resolution panel. Graphics data may also be output asynchronously to a CRT. Time base converter receives frequency related input parameters and generates at least one asynchronous output at the desired output resolution.

Abstract: A spatial light modulator comprises: a first substrate (25); a second substrate (26); a layer of electrooptic material disposed between the first substrate and the second substrate. A first electrode arrangement (27) is disposed over the first substrate (25); and a second electrode arrangement (35) is disposed over the second substrate (26). The first electrode arrangement (27) comprises first and second electrode layers (28,29) disposed over the first substrate, with the spacing between the first electrode layer (28) and the first substrate (25) being different to the spacing between the second electrode (29) layer and the first substrate (25). The first electrode layer (28) and the second electrode arrangement (35) are configured so as to co-operate, in use, to define a plurality of first addressable regions in the electrooptic material.

Abstract: A display apparatus includes a display unit, a time setting unit, a detection unit and an image changing unit. The display unit is configured to display a color image. The time setting unit is configured to set a time. The time to be set by the time setting unit can be changed by a user. The detection unit is configured to detect whether the time set by the time setting unit is passed. The image changing unit is configured to change a color image to be displayed on the display unit to a monochrome image so as to warn the user that the time set by the time setting unit is passed, if the detection unit detects that the time set by the time setting unit is passed.

Abstract: When performing A/D conversion on image signals, when reducing noise that is caused by jitter by adjusting the phase of the sampling clocks, even if the input waveform has considerable waveform distortion such as a triangular wave, it is possible to reliably reduce this noise. Input analog image signals are converted into digital image data using sampling clocks from a PLL circuit by A/D conversion means. Next, image data that has delayed by a 1 clock delay circuit is subtracted from the digital data by a subtracter. The maximum value of one screen of the subtracted output is then determined, and 5 is subtracted therefrom to provide a threshold value. A comparator compares the subtracted output and the threshold value, and outputs a signal when the subtracted output is greater than the threshold value. A counter then supplies the count value of these signals to a CPU, and the CPU controls the phases of the sampling clocks using a switch.

Abstract: A display controller in a computer system controls the asynchronous output of graphics display data in a computer system having at least one fixed resolution flat panel display. Fixed panel displays may have problems displaying non-native resolutions particularly at lower resolutions. The controller of the present invention uses a time base converter, horizontal and vertical Discrete Time Oscillators (DTO), and polyphase interpolator, which may be Discrete Cosine Transform (DCT)-based to expand graphics display data asynchronously from native resolution to at least one resolution suitable for display on a fixed resolution panel. Graphics data may also be output asynchronously to a CRT. Time base converter receives frequency related input parameters and generates at least one asynchronous output at the desired output resolution.

Abstract: An active matrix LCD defines a display signal period and a reset period in each vertical scan period. The display signal period is a period to write and hold display signals in pixels in response to a row select pulse generated from an output pulse of a first shift register (SR1). The reset period is a period to write and hold a reset voltage in the pixels in response to a row select pulse generated from an output pulse of a second shift register (SR2). The ratio of the display signal period to the reset period is adjustable in units of horizontal scan time by changing the number “n” of horizontal scan periods to be passed between the time when the first shift register receives a scan start signal (WT) and the time when the second shift register receives a scan start signal (Reset).

Abstract: In the case of supplying voltage to a common electrode which faces a pixel electrode through electro-optical substance while changing the voltage from a first low-potential-side voltage to a first high-potential-side voltage, a second high-potential-side voltage, which is higher than the first high-potential-side voltage, is supplied to the common electrode instead of the first low-potential-side voltage, and the first high-potential-side voltage is then supplied to the common electrode. One of the first high-potential-side voltage and a first intermediate voltage, which is lower than the first high-potential-side voltage but higher than the first low-potential-side voltage, may be supplied to the common electrode before supplying the second high-potential-side voltage to the common electrode.

Abstract: A liquid crystal display device comprising, a liquid crystal panel having parallel provision of a plurality of common electrodes COM extending in a first direction on one of a pair of substrates with a liquid crystal layer interposed therebetween and parallel provision of a plurality of segment electrodes SEG extending in a second direction crossing in the first direction on the other of the pair of substrates, a common driver for applying a scan signal(s) to the plurality of common electrodes COM, and a segment driver for applying to each of the plurality of segment electrodes SEG a pulse-width-modulated data signal voltage corresponding to display data, wherein the segment driver is operable upon switching of the pulse-width-modulated data signal voltage input to the segment electrode SEG to temporarily output to the segment electrode a voltage which is substantially equal to a non-select voltage of the common electrodes COM.

Abstract: Some embodiments provide application, at a beginning of a first display frame, of a first potential to a pixel imaging element, the first potential to reset the pixel imaging element to a reset state, application, during the first display frame, of a second potential to the pixel imaging element, the second potential to set the pixel imaging element to a desired imaging state, and change, at a beginning of a second display frame subsequent to the first display frame, of the second potential to a third potential, the third potential to reset the pixel imaging element to the reset state.

Abstract: A system and method for driving a liquid crystal display (LCD) having at least one segment. The system includes an LCD driver connected to a segment of the LCD. A processor is connected to the LCD driver. The processor may be selectively configured into any of at least two multiplexing modes, where the at least two multiplexing modes produce at least three voltage levels for driving the at least one segment of the LCD. Another embodiment includes a system and method for driving an LCD having a segment including a first and second electrode. An LCD driver is coupled to the first and second electrode. A processor is coupled the LCD driver. The processor initiates a substantially periodic signal on the first electrode and a delay signal having a time delay relative to the substantially periodic signal. The signals on the first and second electrodes form an RMS voltage to drive the segment of the LCD to any of at least three display voltage levels.

Abstract: The present invention provides a device for signal transfer, which outputs a treatment signal relating to a vertical-horizontal composite sync signal of a monitor and an integrated signal of the vertical-horizontal composite sync signal. There is a plurality of logic circuits in the device of the present invention. The first logic circuit is provided for receiving the vertical-horizontal composite sync signal and the integrated signal, and outputs a high level signal when the voltage level of the vertical-horizontal composite sync signal transforms from the high level to the low level while the voltage level of the integrated signal is in the low level. The second logic circuit is connected to the first logic circuit and receives the vertical-horizontal composite sync signal and the signal outputted from the first logic circuit.

Abstract: The present invention is a head-mounted display device comprising a head holding holder that is proximate at least to the two sides of the head and to the front of the head, and a display unit that is deployed on that holder, at a position over either the left or right eye at the front of the head.

Abstract: A power saving circuit for a liquid crystal panel (LCD) and a plasma display panel (PDP) recovers an energy charged in a panel capacitor through one path of a drive IC driving a scan electrode or data electrode for the PDP, and recovers the energy charged in the panel capacitor through one path of a column drive IC or row drive IC for the LCD panel. The energy recovery path can be a parasitic diode or protective diode of the drive IC. The power saving circuit can operate in an addressing period.

Abstract: A liquid crystal display (LCD) system, comprising a matrix of pixels, actuates each pixel by applying positive and negative voltage differences across a liquid crystal layer. The liquid crystal layer is parallel to a transparent cover. The transparent cover is adjacent to a cover electrode. Each pixel includes a pixel electrode positioned on the opposite side of the liquid crystal layer from the cover electrode. The positive and negative voltage differences are asymmetric to compensate for polarity-dependent characteristics of the LCD materials. The positive and negative voltage differences are applied for durations that counterbalance the asymmetric rates of charge accumulation.

Abstract: A digital circuit having a plurality of digital outputs coupled to backplane(s) and segments of a LCD glass in combination with a software program functions as a “switched mode” LCD driver. Alternating in polarity but equal in magnitude RMS voltage pulses are applied between segments and backplane(s) of the LCD glass. The voltage amplitude and time duration of these pulses determine whether a LCD segment is opaque or clear and the overall contrast of the LCD.

Abstract: Tilt which is inclination of a normal of optical disk relative to optical axis of optical head is corrected with a liquid crystal element. In a driver for the liquid crystal element, a periodic waveform generator generates periodic waveform and an inverting element inverts the periodic waveform. The periodic waveform and the inverted waveform are connected to two ends of a potential divider which provides partial voltages. The periodic waveform is connected to a common electrode of the liquid crystal element, and the partial voltages of the potential divider are connected to electrodes opposing the common electrode. A structure of a driver circuit for each direction is simple. Tilt in a plurality of directions can be performed independently of each other. Spherical aberration is also corrected. When the liquid crystal element is mounted to a fixed component, deterioration due to jitters is reduced.

Abstract: The liquid crystal driving circuit device has AC generating means (50) for generating an alternating current component of a drive signal, a capacitive element (3) with one terminal connected with said AC generating means, current limitation means (2) with one terminal connected with the other terminal of the capacitive element (3), and DC generating means (52, 53), for generating a direct current component of the drive signal, said DC generating means having an output connected to another terminal of the current limitation means (2). The capacitive element (3) eliminates the direct current component of an output signal from the AC generating means (50), and the current limitation means (2) limits a current caused by a voltage difference between a voltage at the other terminal of the capacitive element (3) and a voltage at the output.

Abstract: A system integration chip for display and memory control applied to a card recognition module is provided. The card recognition module includes a module casing, a memory card, an oscillator, a storage, and a display. The system integration chip is disposed in the module casing for recognizing a data stored in the memory card and storing the data in the storage, and the data is converted into a signal by the oscillator and then displayed by the display.

Abstract: A liquid crystal display panel (10) in a watchcase (41) displays time information and/or calendar information. In the liquid crystal display panel (10), a liquid crystal layer (3) is disposed between an upper substrate (1) and a lower substrate (2). On the upper substrate (1) are formed segment electrodes (5g) and an auxiliary electrode (11) that surrounds the segment electrodes with gaps (G1), and the segment and auxiliary electrodes are composed of the same transparent conductive film. An opposite electrode (6) is formed over the entire display area of the lower substrate (2). The overlaps between the opposite electrode (6) and the segment electrodes (5g) form pixel areas (32), while the overlap between the opposite electrode (6) and the auxiliary electrode (11) forms a background area (33).

Abstract: A display controller in a computer system controls the asynchronous output of graphics display data in a computer system having at least one fixed resolution flat panel display. Fixed panel displays may have problems displaying non-native resolutions particularly at lower resolutions. The controller of the present invention uses a time base converter, horizontal and vertical Discrete Time Oscillators (DTO), and polyphase interpolator, which may be Discrete Cosine Transform(DCT)-based to expand graphics display data asynchronously from native resolution to at least one resolution suitable for display on a fixed resolution panel. Graphics data may also be output asynchronously to a CRT. Time base converter receives frequency related input parameters and generates at least one asynchronous output at the desired output resolution.

Abstract: A display panel includes a plurality of alphanumeric segment display elements. A display control circuit controls a plurality of the alphanumeric segment display elements in accordance with either of frequency data or equalizing characteristic data supplied from an audio apparatus mounded on the vehicle. The display control circuit operates a plurality of the alphanumeric segment display elements either to display digits of the frequency data in response to the frequency data or to display a spectrum characteristic waveform over a plurality of the alphanumeric segment display elements in response to the equalizing characteristic data, so that equalizer characteristic is selectively displayed on the alphanumeric segment display elements originally provided for displaying the receiving frequency.

Abstract: A liquid crystal display driver has a system of driving a plurality of segments with 1/n duty binary voltages. In the system, one frame period has the following three sub-periods; the first sub-period, where the line sequential driving is performed, the second sub-period, where adjustment is made on the segment voltage dispersion which occurs depending on display patterns, and the third sub-period, which is at the other time span than the first and the second sub-periods in the same frame period, where the potentials of the common signals and those of the segment signals are identical. With this driving method, constant Von/Voff ratio is obtained, and the contrast dispersion and crosstalk, which occur depending on a display pattern, are mostly eliminated. Then a good display quality is obtainable, and also the effective values of the voltages applied to the liquid crystal, are adjustable irrespective to the power source voltage.

Abstract: A display apparatus displays an image based on image data and distance data concerning each pixel. The display apparatus has a detector, a display data generator. The detector detects a visual range from a viewer's eye to the viewer's point of regard. The generator produces display data based on the image data, the distance data and the visual range. The display apparatus further has an image display, projector and controller. The image display displays an image based on the display data. The projector projects the displayed image as a virtual image. The controller controls a projection distance of the virtual image so that the virtual image is projected onto the point of regard.

Abstract: Method and apparatus for controlling the updating of a random access memory (RAM) that stores data for coding the activation of segments of one or more alphanmeric characters of a liquid crystal display (LCD), to maintain substantially a direct current (DC) voltage value of zero across transparent conductive plates of the LCD, is performed or provided in a microcontroller having internal LCD control capabilities. A type B waveform is employed for activating the LCD, the waveform being of a type in which data is transmitted over two frames, the data in the second frame of which is the inverse of data in the first frame thereof to maintain an average DC voltage value over each two-frame portion of the waveform at substantially zero volt. The RAM is allowed to be written to for updating the data therein only after completion of an entire two-frame portion of the waveform and before commencement of a new two-frame portion, to avoid a non-zero average DC voltage across the LCD glass during a two-frame portion.

Abstract: A display body (1) is capable of being mounted via a support frame (3) having band pieces (2) on the head of a doctor, for instance a surgeon. The display body (1) has cylindrical grips (4) projecting from its opposite sides. The grips (4) are attached to and detached from the display body (1). The grips (4) are cylindrical in shape.

Abstract: A drive method and a drive unit for a liquid crystal display unit which reduce the variation in the effective value of an applied voltage dependent upon the display patterns, are inexpensive, and enhance the display quality are provided. There is provided a segment-side liquid crystal drive circuit 2 which incorporates an output control section 26 where an output correction period is provided in an output of the segment-side liquid crystal drive circuit 2 at intervals of a 1-line scanning period, and during the output correction period a display voltage level of the output is set to an OFF display voltage level when the display voltage level of the output is in an ON display level and to an ON display voltage level when the display voltage level of the output is in an OFF display level.

Abstract: A passive matrix liquid crystal display and a method of driving the same are provided. A desired RMS voltage to be achieved during a first frame is determined for each pixel element of the display. A modulation coefficient is determined for each pixel element as a function of the desired RMS voltage for the pixel element during the first frame. For each cycle of the frame, a phase delay is determined for each column drive waveform as a function of the sum, over all rows, of the product of each modulation coefficient of a pixel element in the column and the phase delay of the corresponding row drive waveform during the cycle.

Abstract: Improved bias drive and noise reduction techniques for use with and image projector, such as a liquid crystal light valve image projector. A bias drive circuit produces a square wave-like signal to drive the liquid crystal light valve, for example, with a square wave signal. The square wave-like signal is phase-locked to the vertical refresh (vertical sync) signal of the projector. A frequency synthesizer is used to drive the bias drive circuit wherein the noise is interlaced by using every other field as the sync reference input to the bias drive circuit. The bias drive circuit is unique in how it reduces unwanted visual noise effects in a displayed image by waveshaping the drive signal and interlacing and phase-locking it to the vertical refresh signal of the projector. These aspects of the present invention combine to virtually eliminate visual noise in the projected image.

Abstract: A method for driving an optical modulation device having a group of scanning electrodes and a group of signal electrodes arranged so that picture elements are defined at the intersections therebetween and a bistable optical modulation material assuming one of two stable states applied between the groups of electrodes, by in a first phase orienting the bistable material at the picture elements on an N-th scanning electrode to one stable state, and applying a writing signal to the signal electrodes in synchronism with a scanning signal to the N-th scanning electrode while orienting the bistable material at the picture elements on an N+1-th scanning electrode to the one stable state.