Nokia Corporation

Michael Buchmann

Dirk Uffmann

Capacitive voltage multiplier for generating voltage pulses, preferably up to 100 V, that are higher than the supply voltage for displays, non-volatile memories and corresponding units especially in small electronic devices, such as handheld telecommunication terminals or corresponding devices, wherein the multiplier comprises a switching capacitor circuit () provided with capacitors and switches for charging the capacitors in parallel and discharging them in series in order to deliver a high voltage pulse. The multiplier further comprises a diode chain circuit () consisting of a diode-chain and pumping capacitors for delivering high voltage current. The inventive system allows the output high voltage to be switched on and held with little longtime drop and with small switching losses and able to supply a load current without significant ripple. Additionally switching the high voltage on and off does not result in efficiency loss.

Voltage multiplier with charge recovery

A handheld projecting device is adapted to project an image and a pointer pattern on an external surface. The projecting device comprises a sensor to detect the movements of the projecting device and means to dampen the movements of the projected image, based on the detected movements of the projecting device. When the handheld projecting device is turned, the position of the projected image is kept substantially stationary whereas the pointer pattern moves on the projected image to indicate a point of the projected image. In an embodiment, the pointer pattern may be used to make a selection between graphically displayed options.

Stabilized image projecting device

The invention relates to an integrated digital circuit comprising a logic circuit portion which takes one of at least two different logic states in accordance with provided control signals. In order to minimize the power consumption and to enable a fast start up of the circuit resuming the previous states, it is proposed that it further comprises a non-volatile storage component. The non-volatile storage component takes one of at least two different logic states based on a non-destructive programming, and keeps a programmed logic state for a basically unlimited time and independently of a power supply until a new programming occurs, and is programmed by each change of the logic state of the logic circuit portion. The invention relates equally to a device comprising such a digital circuit and to a method of operating such a digital circuit.

Growing community of inventors

Duisburg, Germany

Michael Buchmann