A base with a keyboard for the manual generation of data combinations, e.g. of a code serving to release a lock of a door on which the keyboard is accessibly mounted, has one or more wipers impregnated with a nonvolatile film of liquid such as silicone oil. The wipers are carried on a lid which is pivotally or slidably attached to the base; movement of the lid, or of a detent holding it in closure position, causes the wipers to sweep across coplanar pressure faces of the keyboard and remove any ...

A membrane keyboard is provided having a first and second plurality of connectors extending therefrom. The first plurality of connectors is attached at one end to a number of switches on the keyboard and at the other end to a processing circuit apart from the keyboard. One end of the second plurality of connectors is also connected to the processing circuit. A third set of connectors is utilized to connect the ends of the second plurality of connectors on the keyboard in a manner to identify the...

The invention relates to a signalling system for vehicles wherein an independent light signal is provided at both the front and rear of a vehicle for a situation wherein the vehicle is both moving and the brakes are being applied or released by the operator of the vehicle. The signal is provided by lights located at the rear and the front of the vehicle which are purple in color, for example. Actuation of the lights is dependent upon two electrical signals, one based on motion of the vehicle and...

A control device suitable for synchros comprising three stator windings. The device comprises four circuit branches with the inputs of the first and the second branches interconnected to receive a first voltage from the ends of the stator windings of the synchro transmitter and with the inputs of the third and the fourth branches interconnected to receive a second voltage from the ends of the stator windings of the synchro transmitter. Two adder elements supply control voltages to the stator win...

This invention applies illustratively to a horizontal driving circuit for a liquid crystal display device, and to a liquid crystal display device utilizing that horizontal driving circuit. With a CMOS latch cell 12 disconnected from power supplies VDD2 and VSS2, the input of the latch cell 12 is connected to an upstream circuit 51 so as to set corresponding data on the cell. Then with the input of the CMOS latch cell 12 disconnected from the upstream circuit 51, the power supplies VDD2 and VSS2 ...

A system for producing graphic displays includes a terminal having a display. Input devices such as a graphics tablet provide graphics input data to the system. A multilayered segmented graphics editor edits data supplied to the system. A device independent graphic data base stores edited graphics data of a plurality of symbols appearing on the display. A graphic controller controls the editor and the display. The system includes a program generator for generating corresponding source code progr...

An active matrix type display panel comprising a first base plate, a second base plate, and a liquid crystal disposed therebetween. The first base plate has thin film transistors formed thereon in the form of a matrix. The second base plate has a counter electrode formed thereon. The source of the thin film transistor are connected to information signal input electrodes which form counter electrodes of capacitive elements for sampling-and-holding information signals.

A display system and method, especially for use in an aircraft head up display system, for maintaining an optical image in a predetermined position on a light emitting screen. The system has a beam type image generator controlled by an operating circuit. A controlled beam scans both a central display region and marginal regions of the screen. The marginal regions have beam sensors and the beam is controlled by a sequence of plural coordinate commands in accordance with a plural coordinate search...

A mobile display device capable of communicating with a host computer depending upon whether it is coupled with a docking station. The mobile display device includes a wired module for receiving the wired input signal applied from the docking station and converting the wired input signal into a first video signal; a wireless module for converting the wired or wireless input signal applied from the host computer into a second video signal; a display panel for reproducing the first video signal an...

A high slew rate amplifying circuit, for a TFT-type of LCD system, includes: an operational amplifier; a pull-up transistor connected to the output of the operational amplifier; a pull-down transistor to the output of the operational amplifier; a control circuit to selectively actuate the pull-up transistor and the pull-down transistor, e.g., according to at least one of a polarity signal and an output enable signal.