Abstract: A liquid crystal display device for enlarging and projecting an image displayed on a transmission liquid crystal display panel through a projecting lens onto a screen by radiating a light from a light source to the panel, has a heat pipe inserted into a transparent cooling vessel filled with transparent cooling liquid for externally radiating heat absorbed by the liquid to suppress the temperature rise of the panel due to the light incident to the panel.

Abstract: A broad-band optical light detector having a detector cell, a system for focusing light on the cell, and a liquid crystal positioned in the light path, the liquid crystal being prepared so that it passes light along the light path in the normal operating range of the detector cell and directs light away from the light path when a threshold intensity of light is reached.

Abstract: An integrated circuit includes an input clock generator circuit responsive to an external TTL level clock signal for generating an internal CMOS level system clock signal for its own use and for use by other integrated circuits. The integrated circuit also includes an internal clock generator circuit responsive to either the internal CMOS level system clock signal or an external CMOS level system clock signal for generating internal CMOS level phase clock signals for its own use. As a result, the integrated circuit has a higher speed of operation since the propagation delay between the CMOS level system clock signal and internal clock signals has been minimized.

Abstract: A switching stage receives two levels at its input, i.e. a high selection level and a low non-selection level. The Darlington stage (T.sub.1, T.sub.2) supplies at its output (E) a high current in the selected mode and a considerably smaller current in the non-selected mode. In order to accelerate the evacuation of charges accumulated in the base of T.sub.2 and hence the deselection time of the stage, an auxiliary current source (I), is connected to a point A. Between the base (B) of the transistor T.sub.2 and the point A two diodes (D.sub.1, D.sub.2) are connected in series in the forward direction. Between the emitter (E) of T.sub.2 and the point A a diode (D.sub.3) is connected in the forward direction. In the selected mode, the major part of the current I passes through D.sub.1, D.sub.2 and this current permits the evacuation of the charges from the base of the transistor T.sub.2 when the stage is deselected.