Abstract: Disclosed is a decoder circuit designed to reduce the number of transistor elements and to increase the speed of operation. The decoder includes a plurality of output selectors for respectively drawing out different decoded output signal lines in group having the common input components. In each output selector, a plurality of serial-connected transistors is provided to execute AND operations for the common input components, and a plurality of parallel-connected transistors to execute OR operation for the remaining and their remaining inverted input components. The final one of the serial-connected transistors is coupled to each of parallel-connected transistors, and thereby the entire AND operation results for the common inputs and remaining inputs, or for the common inputs and remaining inverted inputs is obtained at the predetermined one of the decoded output signal lines.

Abstract: The power switch driver is a controlled 4-terminal device for substantially capacitive load, e.g power MOSFET. The switching speed, efficiency and reliability are very high. The switching frequency is inherently limited. The bias supply of the driver may be floating or grounded. The output voltage is approximately two times higher than supply voltage. The energy delivered to the capacitive load is recovered. The driver comprises an inductor for attaining a current and providing binary output voltage. One switch selectively applies the current having any polarity to the supply voltage source. Another switch selectively applies the current having one polarity to ground. A diode applies the binary output voltage having a reverse polarity to ground.

Abstract: A driving circuit for liquid crystal display is disclosed and includes a circuit for outputting driving signals to a ferroelectric liquid crystal display in order to construct visual information in the display and a voltage source for supplying a predetermined voltage such that when the display system is switched off the circuit means outputs an erasing signal to the liquid crystal display for erasing all of the visual information displayed in the display and eliminates phantom figures from appearing when the display is reused.

Abstract: A clock switching circuit comprises a multiplexer, a gate, a first detector, a second detector and a state machine. The multiplexer receives two clock signals and outputs one of them through the gate. The first detector is coupled to the output of the multiplexer and the second detector is coupled to the output of the gate. The state machine controls the output of the gate and the multiplexer in response to signals from the first and second detector, and prevent glitches from being output by the gate.

Abstract: An optical modulation display device is disclosed, comprising a polymer matrix having dispersed therein a liquid crystal composition containing a photochromic compound as a constituting component, or comprising a photochromic polymer matrix having dispersed therein a liquid crystal composition. The display device provides a wide area and flexible display which can be driven without using a matrix addressing system.

Abstract: A master/slave latch circuit employs a single-wire clock, with the clock being applied to only N-channel transistors in the master latch and to only P-channel transistors in the slave latch so that a race-through condition is alleviated in the event of clock skew. The circuits are of ratioless operation, since P-channel transistors are used in each circuit to pull the high side to the supply voltage, and N-channel transistors are used on the low side to assure a zero voltage level. Input to each latch is to the gates of a P-channel pull-up and an N-channel pull-down, while the storage node is between the two clocked transistors. The level of the storage node is inverted and fed back to at transistor across one of the clocked transistors, the one on the high side for the master latch and the low side for the slave latch, and these feedback transistors are of a channel type to support the ratioless scheme.

Abstract: A liquid crystal display comprises a pair of substrates provided with an electrode arrangement in matrix form. A chiral smectic C phase liquid crystal material is interposed between the substrates. In the liquid crystal layer, each pixel consists of a number of micro-domains which can be compared to polycrystal line structures. Interaction between adjacent pixels through well ordered liquid crystal structure is suppressed by virtue of the micro-domains.

Abstract: The invention relates to a method of providing a surface layer on a substrate, which surface layer can bring about an inclined orientation of the molecules of the liquid crystalline layer applied to the surface layer at the interface between the surface layer and the liquid crystalline layer. The surface layer is manufactured from a liquid crystalline auxiliary layer in which the orientation of at least a part of the molecules is permanently fixed.

Abstract: A circuit employable as a differential multiplexer (10, 310, or 610) or as a differential logic gate (110, 210, 250, 410, or 510) of either the OR/NOR or EXCLUSIVE OR/EXCLUSIVE NOR type contains four pass gates that operate on four circuit input signals and are controlled by two additional circuit input signals. Two of the pass gates drive a bipolar transistor serially coupled to a first FET driven from the other two pass gates. Likewise, the second pair of pass gates drive another bipolar transistor serially coupled to another FET driven from the first pair of pass gates. The bipolar transistors supply respective circuit output signals. The two FETs are of a first polarity. The circuit preferably includes a pair of FETs of a second polarity opposite to the first polarity. The second pair of FETs are arranged so as to provide output pull-up/pull-down assistance for the bipolar transistors.

Abstract: A biasing network for use in conjunction with a mixer employing field effect transistors which provides for minimum conversion loss over a range of process and temperature conditions. The biasing circuit includes a first field effect transistor having a small gate periphery which is configured as a current source, a second or reference field effect transistor having a gate periphery substantially equal to the gate peripheries of the transistors in the mixer to which the biasing circuit is providing DC biasing voltages and a voltage divider which is functional in defining operating conditions for the reference transistor.

Abstract: A numerical control type oscillator whose output oscillation frequency is controlled depending on input numerical data, comprises: first accumulation means for accumulating a first set value which is set depending on the input numerical data with a first frequency and sequentially outputting the accumulated value; second accumulation means for accumulating a second set value which is set depending on the input numerical data with a second frequency and varying the first set value by a predetermined value temporarily when the accumulated value reaches a predetermined maximum value; and frequency generation means for outputting a frequency depending on an output of the first accumulation means as an oscillation frequency.

Abstract: A high performance light valve for optimizing the switching of a liquid crystal on an area basis. The light valve uses a transparent charge separation layer to allow for the accumulation of photo-generated charges. The light valve concentrates the light absorption in a narrow charge generation region where high electric fields are present from the junction of dissimilar semiconductor materials. The light valve has a switching characteristic dominated by the light and dark carrier densities in a narrow reversed biased region.

Abstract: The invention is directed to an active matrix-type liquid crystal display using a horizontal MIM device as a non-linear resistance device. The layers of the metal-insulator-metal elements are formed in a horizontal direction and use a hard carbon film as the insulator layer of the horizontal MIM device. The hard carbon film comprises carbon and hydrogen and a constituent element such as a group III element, group IV element, group V element, alkali metal element, alkaline earth metal element, nitrogen atoms, oxygen atoms, chalcogen atoms or halogen atoms, and has typical specific resistivities of from 10.sup.4 to 10.sup.13 ohm.cm. The claimed devices are economical to produce and substantially free from short circuits caused by pinholes or voids in the insulator layer. In a preferred embodiment, the electrodes of the MIM device are inter-digital in shape.

Abstract: A liquid crystal optical device of this invention includes one substrate having a substrate surface on which one electrode is formed, the other substrate having a substrate surface on which the other electrode is formed, a first aligning film covering one electrode of one substrate and at least a portion of the substrate surface, a second aligning film covering the other electrode of the other substrate and at least a portion of the substrate surface, a dielectric layer disposed between at least one of the first and second aligning films and the electrode corresponding thereto, a sealing member for bonding the one substrate and the other substrate to each other with a predetermined gap therebetween to oppose the substrate surfaces of the one and the other substrates on which the electrodes are formed, and sealing the gap, and a ferroelectric liquid crystal material sealed in the gap surrounded by one and the other substrates disposed oppositely and the sealing member.

Abstract: A liquid crystal display apparatus detects and regulates its display contrast. A liquid crystal display unit is provided therein with a pair of liquid crystal cells for use in detection of the display contrast. Incident light is detected through the cells, and the detected results are fed back to control a drive voltage applied to the liquid crystal display unit so as to automatically regulate the display contrast at optimum level.

Abstract: An optical shutter operated device includes a reflector to reflect incident light and a liquid crystal light shutter interposed in front of the reflector. A photovoltaic cell is disposed behind the shutter and is illuminated by the incident light thereby supplying a control voltage to the liquid crystal light shutter for causing it to alternate cyclically between a relatively transparent state and a relatively opaque state.

Abstract: A liquid crystal device incorporating ferroelectric liquid crystal medium having smectic layers between two supporting plates provided with electrodes, the smectic layers exhibiting a spread of angles with respect to at least one of the supporting plates, whereby a gradual transmission/voltage characteristic is achieved. The spread of angles can be obtained by any of several techniques, such as subjecting the device to a low frequency electric field, or a local thermal, mechanical, chemical or magnetic treatment.

Abstract: Illuminating light from a light source is reflected by a reflector and collimated by a condenser lens and then applied onto the back of a liquid crystal cell. The liquid crystall cell has attached on its light source side an optical sheet which consists of a large number of optical elements such as convex or concave lenses aligned with picture elements or pixels of the liquid crystal cell. The optical elements each converge the rays of light from the light source onto each of the pixels, so that the rays that would otherwise strike a matrix circuit section and a black matrix layer will be focused on and passed through the pixels. This enhances the brightness of an image formed on the front of the liquid crystal cell and also prevents temperature rise in the liquid crystal cell because the black matrix layer and the matrix circuit section, components of the liquid crystal cell, are not struck and heated by the incoming light rays.

Abstract: A residual charge removing circuit connected to a node in a power-on reset pulse generating circuit for removing positive charges which remain in this node when a power supply is turned off is disclosed. This residual charge removing circuit is formed of two N-channel MOS transistors connected in series between the node and the ground, and one capacitor. Out of the two N-channel MOS transistors, the transistor near the node has a grounded gate. The capacitor is connected between a gate of the transistor, out of the two N-channel MOS transistors, which is distant from the node, and a power supply. The gate of the transistor distant from the node is connected to a connection point between the two N-channel MOS transistors. Therefore, when a supply potential lowers below a threshold voltage Vth of the MOS transistors due to the power-off, the transistor distant from the node is turned off, so that a potential of the connection point becomes -Vth owing to a discharge of negative charges from the capacitor.

Abstract: A liquid crystal display device and its driving method of the present invention have a voltage application scheme to control a stable condition of a gap between pixels, by applying a voltage to a liquid crystal panel in which ferroelectric liquid crystal is sandwiched between substrates each having a plurality of electrodes. It is possible to implement the black matrix conditions with a simple configuration without a light shielding layer by controlling the stable condition of the gap, to display a grey tone with a combination of pixels and a gap, or to raise the opening ratio by making the condition between adjacent pixels and a gap the same condition.