Abstract: An information display system in which information can be referred to without a power supply anytime and anywhere like information recorded on paper, and in which information can be rewritten repeatedly, and such information can be outputted instantaneously and in large numbers. An image accepted by an image input unit (1 in FIG. 1) is converted by a signal processing unit (11) into a data format for writing the image into a display unit (3). An information sending unit (12) controls plural display elements (3-1 to 3-N), and it sends the information to-be-displayed to the plural display elements (3-1 to 3-N) in parallel through a connector array (13). Thus, the image accepted by the image input unit (1) can be instantaneously displayed on the multiple display elements (3-1 to 3-N). The display elements (3-1 to 3-M) have storability.

Abstract: The invention provides a display control apparatus and a display control method wherein, where digital gradation display is performed, occurrences of a moving picture pseudo contour can be reduced simply. A signal production circuit produces a signal for driving a display section so that light of divisional light amounts obtained by dividing light amounts corresponding to bits which compose digital values which are pixel values may be emitted in a such manner as to be distributed within a time corresponding to one screen. In this instance, where both of a first light amount corresponding to a predetermined bit and a second light amount corresponding to a bit in a lower order by one bit to the bit are divided, the first and second light amounts are divided so that the division number of the first light amount may be smaller than twice the division number of the second light amount.

Abstract: In a liquid-crystal display device, one of substrates has pixel electrodes and TFTs for driving the pixel electrodes, and the other substrate has opposing electrodes formed thereon. The orientation of the liquid crystal is controlled to exhibit bistability in which bistable states having different transmittances are maintained when no voltage is applied as a result of applying a voltage exceeding a threshold value, and to exhibit a continuous response characteristic in response to an applied voltage in a predetermined range which does not exceed the threshold value. The voltage applied to the liquid crystal can be selectively controlled between a voltage equal to or higher than the threshold value and a voltage lower than the threshold value, and a two-gradation display using the bistability and a multi-gradation display using the response characteristic are made.

Abstract: The switching between the normal operation mode and the memory operation mode is achieved by disposing one retaining circuit 110 for a plurality of pixel elements (for example, 2 or 4 pixel elements). The retaining circuit 110, which is a SRAM, requires considerable circuit space. The sharing of one retaining circuit by a plurality of the pixel elements enables the reduction of the seeming “number of the pixel elements” under the memory operation mode. This can lead to the size reduction of the pixel element, achieving the finer display under the normal operation mode. Also, the reduction in the number of the retaining circuits can further reduce the energy consumption under the memory operation mode, comparing to the case where the retaining circuit 110 is disposed for each of the pixel elements.

Abstract: There is provided a semiconductor device having TFTs whose thresholds can be controlled. There is provided a semiconductor device including a plurality of TFTs having a back gate electrode, a first gate insulation film, a semiconductor active layer a second gate insulation film and a gate electrode, which are formed on a substrate, wherein an arbitrary voltage is applied to the back gate electrode.

Abstract: A display includes a ferroelectric liquid crystal material having an asymmetric polarity response property, a section which applies an image signal to a pixel of the material for every two fields forming one frame, and a controller which reverses the polarity of the signal in one frame period. Particularly, the controller is configured that the polarity of the signal is reversed in a selected one of first and second manners, the first manner initiating a signal amplitude change from a polarity in which a larger response of the material is obtainable, the second manner initiating a signal amplitude change from a polarity in which a smaller response of the material is obtainable, and the selected manner being smaller in the total of brightness deviation generated in a frame immediately after the change for each of predetermined brightness transitions.

Abstract: A single polar driving method for a cholesteric liquid crystal display. The method comprises the steps of selecting the pixels by applying a first signal switching between a ground and a first level to the common line of the selected pixels, driving the selected pixels into a reflecting state by applying a second signal out of phase with the first signal and that switches between a second and third levels to the segment lines thereof, driving the selected pixels into a transparent state by applying a third signal in phase with the first signal and that switches between the second and third levels to the segment lines thereof, and deselecting the pixels by applying a fourth signal fixed at a fourth level to the common lines thereof.

Abstract: A liquid crystal projector apparatus is presented, which can display an image free from an influence of a temperature variation of a liquid crystal panel without the necessity to directly measure the temperature of the liquid crystal panel. The liquid crystal projector apparatus includes a temperature sensor for detecting a temperature at a location in the liquid crystal projector apparatus except liquid crystal panels, a memory for storing temperature detection data obtained by the temperature sensor within a period from a power supply starting time to a steady operation entering time, an arithmetic operation device for estimating a temperature of each of the liquid crystal panels based on the temperature detection data stored in the memory, and liquid crystal drive sections for correcting drive voltages for driving the liquid crystal panels with output signals of the arithmetic operation device.

Abstract: An active matrix display panel has (1) a plurality of row electrode lines; (2) a plurality of column electrode lines; (3) a first MOS transistor for each pixel; and (4) a second MOS transistor for each pixel. The first MOS transistor has (a) a first terminal connected to each of the column electrode line, (b) a second terminal connected to a liquid crystal, (c) a control terminal connected to each of the row electrode line, wherein an ON potential is higher than a signal potential supplied to the row electrode line. The second MOS transistor has (a) a first terminal connected to each of the row electrode line, (b) a second terminal connected to the electro-optic element, and (c) a control terminal connected to the column electrode line, wherein an ON potential is higher than a signal potential supplied to the column electrode line.

Abstract: A multi-domain vertical alignment (MVA) liquid crystal display (LCD), including a first substrate and a second substrate, a common electrode, a number of pixel electrodes, a number of first switches and second switches, and liquid crystals (LCs). The common electrode is formed on one surface of the first substrate. The pixel electrodes are formed on a surface of the second substrate and are opposite to the common electrode. Each of the pixel electrodes includes a slit and a first sub-pixel electrode and a second sub-pixel electrode which are electrically isolated to each other by the slit. Each of the first switches is used for controlling corresponding first sub-pixel electrode, and each of the second switches is used for controlling corresponding second sub-pixel electrode. The liquid crystals (LCs) are sealed between the first substrate and the second substrate.

Abstract: A method of driving a ferroelectric liquid crystal display with improved brightness while providing DC compensation. The method includes applying a data voltage, a compensation voltage, and a common voltage to each display pixel in each frame so as to selectively drive the liquid crystals, wherein the compensation voltage has a polarity (referenced to the common voltage) that is opposite the data voltage. The data voltage is applied for a longer period of time than the compensation voltage, but the magnitude of the compensation voltage is greater than the magnitude of the data voltage (when both are referred to the common voltage).

Abstract: A method of driving an anti-ferroelectric liquid crystal display (LCD) panel is provided that provides uniform transmittance display characteristics. In the anti-ferroelectric LCD panel, signal electrode lines are arranged in parallel above anti-ferroelectric liquid crystal cells, and at least first and second scan electrode lines are arranged below the anti-ferroelectric liquid crystal cells perpendicular to the signal electrode lines. The method includes a first driving step and a second driving step, which are repeated. Each of the first and second driving steps includes a scanning step, an inversion step, and an iteration step. In the scanning step, a scan selection voltage is applied to the first scan electrode line, and simultaneously, display data signals are applied to the signal electrode lines.

Abstract: A liquid crystal panel includes a cell formed between substrates and disposed to face each other and severally including alignment films and, liquid crystal molecules held inside the cell, and an electrode for applying a driving electric field in a parallel direction to the liquid crystal molecules. In the liquid crystal panel, the electrode is formed on at least one of the substrates and on a side facing the liquid crystal molecules. An alignment film is formed on the substrate so as to cover the electrode and an alignment film is disposed on the opposite substrate. The alignment films and are severally selected from a horizontal alignment film and a perpendicular alignment film which are different in aligning modes.

Abstract: A timing control circuit provides at least a driver control signal and a display data signal to a driver circuit of a display panel such that a predetermined image is displayed on the display panel, dispensing with an external source providing the signals, thereby an EMI measurement of a display apparatus can be performed without influences from an external source and a cable that connects the external source to the display apparatus to be examined.

Abstract: There is provided a liquid crystal display drive method that uses a drive voltage waveform consisting of a display signal period (display waveform 32 bits) and a control signal period irrelevant to display (control waveform 2 bits) in a given time or a period of plural frames or one frame. This method suppresses generation of internal DC voltage and thus prevents impurity ions from deteriorating the quality of displayed pictures.

Abstract: Compensation, e.g. temperature compensation of the operating voltage of an LCD is obtained by using the V50 point of a test cell via the differentiated AC current (switching current of the test cell as a control parameter).

Abstract: An antiferroelectric liquid crystal panel, having an antiferroelectric liquid crystal between a pair of substrates, which comprises a driving circuit adapted to output a layer structure controlling voltage waveform having a frequency of 1 Hz to 100 Hz and a voltage in the range of +10 V to +50 V or ?10 V to ?50 V, for an optional length of time.

Abstract: A projection type image display apparatus projects, under magnification by using a projection lens, image information carried by a luminous flux emitted from a ferroelectric liquid crystal display device. A field-sequential color-decomposing illumination optical system generates illumination color light for irradiating the ferroelectric liquid crystal display device. An analyzer and a quarter wave plate are arranged between the ferroelectric liquid crystal display device and the projection lens successively from the ferroelectric liquid crystal display device side.

Abstract: An operating method for a color display system including an active matrix bistable liquid crystal display (LCD) having a plurality of pixels arranged in a matrix based on color data and status bits corresponding to each of the pixels stored in a memory includes steps for generating voltage data corresponding to the pixels based on the color data and the status bits stored for each of the pixels, converting the voltage data to drive signals suitable for driving the active matrix bistable LCD, and applying the drive signals to the active matrix bistable LCD. In an exemplary embodiment, the active matrix bistable LCD is a Cholesteric LCD. Advantageously, the generating, converting, and applying steps are repeated for a corresponding pixel N times, where N is an integer established by the status bits.

Abstract: Disclosed is a liquid crystal optical device which produces a color display by using a light source mounted behind a liquid crystal panel and capable of emitting a plurality of different colors, wherein the period from the time the light source mounted on the back emits one color to the time the light source switches to the next color is set as a scanning period, and the scanning period comprises a selection period (Se), a non-selection period (NSe), and a reset period (Rs), the length of the reset period being equal to one half the scanning period, and wherein a black display state is effected in the reset period (Rs).

Abstract: The present invention is directed to provide a driving circuit and driving method for a LCD having high performance of moving image displaying within few amount of memory and downscaled circuit. In the present invention, a voltage applied to a pixel to drive liquid crystal material in the pixel is determined as a voltage with which the transparency of the pixel at the end of the current field becomes the designated transparency. To determine the voltage, a data table for quick response in which output data is stored in correspondence with some of the possible value of a preceding field image data and some of the possible value of the current field image data is employed, and the output data corresponding to the preceding field image data and the current field image data is determined by the data table through linear interpolation. The voltage corresponding to the output data is applied to the pixel.

Abstract: A low power color display system includes a memory which, stores color data and status bits corresponding to a plurality of pixels, status logic, which generates the status bits responsive to receipt of color data for a respective one of the pixels, a data generator, which generates voltage data corresponding to the pixels based on the color data and the status bits for each of the pixels, driver circuitry, which generates voltage signals responsive to receipt of the voltage data for each of the pixels, and a bistable liquid crystal display (LCD) having multiple cells arranged in a matrix, each cell corresponding to a pixel, the LCD being responsive to the voltage signals. Preferably, the system also includes a power supply which provides power to the driver circuitry, and a power manager, the latter turning the power supply ON when the data generator is in the first operating mode and turning the power supply OFF when the data generator is in the second operating mode.

Abstract: Disclosed is a method of treatment for preventing the occurrence of image sticking and recovering from image sticking in a ferroelectric liquid crystal device. By applying a low-frequency AC voltage to the ferroelectric liquid crystal device, multiple domains are formed in a pixel, domain boundaries are caused to flow, and fine segmentation of domain regions are induced. As the low-frequency AC voltage, a voltage having a frequency of 10 to 100 Hz and an amplitude of ±1.5 to ±3.0 V is applied, for example, for 30 seconds or more. The low-frequency AC voltage is applied to the liquid crystal device immediately before stopping liquid crystal driving or immediately after starting liquid crystal driving. Further, the low-frequency AC voltage is applied when the occurrence of image sticking in the liquid crystal device is detected.

Abstract: Relates to constructions of a backplane which comprises an array of addressable active elements 52 on a semiconductor substrate 51 for selectively energizing respective first electrodes 65 of the array, for example in a liquid crystal matrix cell. To reduce photo-induced degradation of images produced thereby (a) at least part of the region beneath a first electrode is adapted to act as a capacitor, for example a depletion layer 66 acting as a reverse biased diode, and/or (b) substantially the whole of each active element is covered by a metallic conductor (59, 60—coupled to row and column conductors). In a variant of (b) the array of active elements may covered by an insulating layer, and each active element is connected to a metal electrode on the insulating layer, the array of said metal electrodes thus formed covering more than 65% of the area of said array.

Abstract: A display apparatus is constituted by a display device including a plurality of pixels and control means for effecting a plurality of displaying operations at each pixel. Each of the displaying operation includes at least a first operation for displaying a first image at a first luminance and a second operation for displaying a second image substantially identical to the first image at a second luminance, said first and second luminances being non-zero and different from each other. One of the first and second luminances may preferably be smaller than ⅕ of the other luminance.

Abstract: Methods of measuring widths of illumination spots and distances between two points, and predicting detected signal widths are provided. Systems, software, and kits for performing the methods of the invention are also provided.

Abstract: A liquid crystal display device includes a liquid crystal panel having a plurality of pixels disposed in a matrix format, a Y-selecting signal generating unit for selecting one or more pixel rows, an X-selecting signal generating unit for selecting one or more pixel columns, and a tone signal generating unit for generating a tone signal for applying the corresponding tone voltage to tone information of said display data onto each of the pixels.

Abstract: A method and a system for displaying images are provided. In the method, a pixel is provided that includes a layer of ferroelectric material and a layer of liquid crystal material. A first electric field is momentarily applied to the pixel to electrically polarize the ferroelectric layer to a first polarization. The first polarization is then used to maintain the liquid crystal material in a first orientation corresponding to a first apparent brightness of the pixel.

Abstract: In a reflective mode FLC application, a ¼-wave plate compensating FLC is used in series with a ¼-wave imaging FLC to compensate for the effects of DC balancing. Alternatively, the compensating wave plate could be any odd ¼-wave multiple, such as 3&lgr;/4, 5&lgr;/4, etc. The FLCs are driven in synchronization between on and off states with the total effective retardation for each FLC being either none or one-half wavelength in a double pass.

Abstract: In a display device employing a field-sequential method, a judgement whether display data is motion picture data or still picture data is made, and the frame number per second is increased for the display of a motion picture during which color break easily occurs by the movement of the line of sight of a user, while the frame number is made smaller than that for the display of a motion picture, for the display of a still picture during which color break hardly occurs. Further, the temperature of a liquid crystal panel is detected, and the frame number per second is increased so as to reduce color break when the result of the detection is not lower than a predetermined temperature, while, the frame number is decreased so as to enable display at low temperature when the result of the detection is lower than the predetermined temperature.

Abstract: There is provided a liquid crystal display which is capable of preventing light from leaking out from the peripheral portion of pixels and which has a high display performance.

Abstract: A method of aligning a ferroelectric liquid crystal (FLC) material capable of facilitating the restoration of an initial alignment of FLC material as a result of mounting of driving circuits includes simultaneously applying a first voltage to a Vcom terminal formed on a source printed circuit board and applying a second voltage to a GND terminal also formed on the source printed circuit board while the first voltage is also applied to a Vcom terminal formed on a gate printed circuit board and while the second voltage is also applied to a GND terminal formed on the gate printed circuit board.

Abstract: The invention relates to a ferroelectric liquid crystal display in which the trailing phenomenon is eliminated by providing an optimum reset period. The ferroelectric liquid crystal display has a reset period for resetting the ferroelectric liquid crystal to a black display state before starting the scanning period, and includes a mechanism for adjusting the length of the reset period in accordance with the display data, thus setting an optimum reset period corresponding to the display data. The reset period is provided for each pixel. Also, the reset period can be provided at the same timing so that all the pixels may be reset at the same time. The ferroelectric liquid crystal panel includes a backlight, which is turned off during the reset period and turned on during the remaining period. A mechanism is provided for adjusting the brightness of the backlight in accordance with the length of the reset period.

Abstract: An electronically controlled appliance capable of automatically adjusting a contrast level of a data display module is disclosed. The device includes an appliance, an intelligent control electrically connected to the appliance and adapted for controlling the appliance, a data display module capable of contrast adjustment and electrically connected to the intelligent control, a data storage medium electrically connected to the intelligent control storing software instructions for monitoring the amount of time the appliance is in an active state and instructions for compensating for the temperature change associated with the amount of time by adjusting the contrast level of the data display module.

Abstract: Row addressing circuitry for implementing random row selection, pre-writes, and bi-directional scrolling includes a plurality of decoders, each connected to an address bus, each having a decoder enable input, and each producing row enable signals for rows of a pixel array. Row enable information for each row from each decoder is logically combined together to produce composite row drive information. Beneficially, each decoder is connected to the same address bus, and each decoder enable signal is produced from a common controller. By using the row enable signals, in synchronization with address information on the address bus, the correct row drive information, such as pre-writes or image information, is applied to each of pixels. Bi-directional scrolling can be implemented by enabling two rows to accept the same image information.

Abstract: Images with enhanced resolution are created with a display device comprising a non-transmissive light valve including addressable pixels, a light source that directs light to the light valve, and a lens positioned between the light valve and the light source, the lens directing light from the light source to the pixels on the light valve and the light valve directing light to viewing optics. The light valve is an integrated circuit ferroelectric liquid crystal device (ICFLCD), or other light valve arrays such as a digital light processor (DLP) display, having an array of addressable pixels. Such light valves may be mounted in a head mounted display.

Abstract: A ferroelectric liquid crystal display and method of driving the same according to an impulse-type method improves a voltage holding ratio. The ferroelectric liquid crystal display and method of driving the same applies a scan pulse at least twice to each gate line of a liquid crystal display panel injected with ferroelectric liquid crystal material during one frame period of the liquid crystal display panel. Data voltages are applied to data lines of liquid crystal display panel in synchrony with the scan pulse.

Abstract: An antiferroelectric liquid crystal display, which is equipped with an antiferroelectric liquid crystal panel having an antiferroelectric liquid crystal sandwiched between a pair of substrates, performs at least one scanning period when carrying out a display based on one set of display data, wherein the scanning period comprises a selection period for determining the state of the antiferroelectric liquid crystal, a non-selection period for holding the state determined in the selection period, and a reset period for resetting pixels to a black display state before initiating the selection period. The length of the reset period is adjusted according to the speed of change in the display data. Alternatively, the pixels are reset to a white display state in the reset period and, during that period, the backlight is turned off.

Abstract: There is provided a display driver incorporating a RAM in which a plurality of memory cells having a three-port configuration can be provided within an interval of output electrodes thereof, and a display unit and an electronic apparatus utilizing the same. The memory cells include a flip-flop comprised of first and second inverters. A first node of the flip-flop is connected to a CPU bit line and an RGB bit line through an N-type MOS transistor. A P-type MOS transistor and an N-type MOS transistor are connected to a second node of the flip-flop. The N-type MOS transistor is connected to a ground potential level at the source terminal thereof. A set signal for each pixel is supplied to the gate terminal of only the flip-flop associated with the pixel to be written, and the set signal sets the second node at the ground potential level.

Abstract: A method for driving an anti-ferroelectric liquid crystal display (LCD) panel in which a plurality of parallel signal electrode lines are arranged over anti-ferroelectric liquid crystal cells (LCs) and a plurality of parallel scan electrode lines are arranged below the anti-ferroelectric LCs, perpendicular to the signal electrode lines is provided. The method includes the steps of selectively shifting LCs into a ferroelectric state, keeping the selected LCs in the ferroelectric state, activating the selected LCs, and restoring the activated LCs to an anti-ferroelectric state. In particular, a scan selection voltage is applied to a scan electrode lines to be scanned, and a display data signal is applied to all of the signal electrode lines, to selectively shift LCs into a ferroelectric state.

Abstract: A reflective memory display is disclosed which includes: a flexible polymeric substrate; a patterned first conductor disposed over the substrate; and a layer including a polymeric dispersed cholesteric liquid crystal material coated over the first patterned conductor. The memory display further includes a patterned second conductor disposed over the polymeric dispersed cholesteric liquid crystal; and control means for repeatedly applying selective unipolar voltages across particular portions of the patterned first and second conductors to cause electric fields which are applied to portions of the polymeric dispersed cholesteric liquid crystal layer to change its reflectance thereby presenting a series of different reflectance images.

Abstract: A driving method for a liquid crystal device comprising a pair of electrodes and a liquid crystal disposed between the electrodes includes a sequence of voltage application operations each comprising application of a reset voltage to the liquid crystal for placing the liquid crystal in a reset state in a reset period and application of a data voltage to the liquid crystal for placing the liquid crystal in a desired gradational display state in a writing period subsequent to the reset period. Each reset voltage is set to provide a prescribed difference in voltage between the each reset voltage and a subsequent data voltage, thus preventing an image memory phenomenon without using an additional reset circuit for exclusively applying the reset voltage to the liquid crystal.

Abstract: A system and method for using gamma correction in a ferroelectric liquid crystal (FLC) display uses a reduced number of different increment values for generating a Vramp signal for the FLC display without noticeably increasing error. The increment values are based upon an inverse gamma curve having a selected gamma value. Using linear interpolation, the increment values are calculated with more increment values being calculated for the beginning of the curve than the flatter end portion of the curve. In addition, an illumination period and a balance period are used so that each pixel of the FLC display is on and off for the same amount of time. As a result, the average voltage across the FLC material is 0V.

Abstract: An object is to eliminate fixed pattern noise due to unevenness or variation of the threshold voltages in DA converters and buffer circuits, when forming a pixel portion integrated with a peripheral driver circuit, including the DA converters, by using polycrystalline Si TFT. For that purpose, a pixel common electrodes is provided independently for each of a signal line, and an output of the buffer circuit is connected to both the common electrode and the signal electrode through a switch. With this, the variation of the threshold voltages in the buffer circuits are cancelled between the common electrode and the signal electrode, thereby enabling to remove the above-mentioned fixed pattern noise therefrom.

Abstract: The invention provides a first gate-line breakage inspection process in which a signal for switching on each thin-film transistor is supplied to each gate of a first left-side transistor sequence, and a current value of a current flowing through two gate lines conducted by each thin-film transistor is measured. In a second gate-line breakage inspection process, a signal for switching on each thin-film transistor is supplied to each gate of a second left-side transistor sequence, and a current value of a current flowing through two gate lines conducted by each thin-film transistor is measured. Subsequently, it is determined whether any gate line is defective based on the inspection results of the first gate-line breakage inspection process and the second gate-line breakage inspection process.

Abstract: A liquid crystal display apparatus is constituted by a liquid crystal device comprising a pair of substrates each having thereon an electrode and a liquid crystal disposed between the pair of substrates and providing a tilt angle, driving voltage application means for applying a driving voltage to the liquid crystal, and at least one polarizer having a polarizing axis. The liquid crystal has a voltage-dependent alignment characteristic such that the tilt angle continuously changes depending on the driving voltage applied to the liquid crystal, and the above at least one polarizer is disposed so that the polarizing axis is shifted from positions providing a maximum transmittance and minimum transmittance under application of no electric field to increase the resultant transmittance and contrast.

Abstract: In a drive circuit for driving a liquid crystal display, a video signal generating block for generating a video signal to be supplied to a display panel, includes, for each of R (red), G (green) and B (blue), and coupled in the named order, a ADC circuit for analog-to-digital converting a video signal, two memories each having a capacity which can hold signals of one line of the display panel, a V-T compensation circuit for compensating a non-linearity of a transparent light strength to an input voltage of the display panel, a polarity inverting circuit for an AC driving of liquid crystal pixels in the display panel, a DAC circuit for digital-to-analog converting the digital signal outputted from the polarity inverting circuit, and an output selection circuit for supplying a precharge voltage to the display panel.

Abstract: Writing and holding a data signal to and in a memory circuit in a pixel driving circuit are controlled according to whether a row scanning line and a column scanning line are selected or not. According to a data signal held in the memory circuit, a pixel driver connects a first voltage signal line or a second voltage signal line to a pixel. A reference voltage is applied to a counter electrode of a counter substrate, and display is performed by a potential difference between the reference voltage and a first voltage signal or a second voltage signal.

Abstract: An optical modulator comprises a layer of a ferroelectric liquid crystal material being provided between an integrated circuit and a light transmissive sheet. The light transmissive sheet and the integrated circuit carry respective electrodes which define selected areas of said layer. In use, the selected areas are addressed with data according to an addressing sequence which is repeated in successive time periods. The optical modulator includes means for providing a plurality of voltage pulses to the one or more electrodes being carried by the light transmissive sheet in a given time period, thus enabling a time dithered greyscale driving scheme to be used.

Abstract: A display device having a memory property capable of maintaining a displayed information even in a state of being separated away from a power source as a result of decreasing the effect of external noise. The display device is detachably attached to a control unit that includes a drive circuit and a power source for driving the display device. The display device has a memory property and maintains the displayed image even in a state of being detached from the control unit. An input protection portion which is an electric load such as resistor, IC or capacitor is provided for the input portion leading to matrix electrodes from the connection terminals for electrically connecting the display device to the control unit. This prevents the infiltration of noise through the connection terminals and lowers a change in the displayed image.