Abstract:
The invention provides a current output stage for providing an output current between a current output terminal and a common potential. The current output stage comprises a sensing resistor for sensing the output current, a first end of the sensing resistor being connected to a voltage input terminal for receiving an input voltage against the common potential. Furthermore, the current regulator comprises an output current regulating element connected between the second end of the sensing resistor and the current output terminal, a level shifting unit connected to the second end of the sensing resistor, for shifting a sensing potential level of the second end of the sensing resistor toward the common potential, and a controller unit connected between the level shifting unit and the output current regulating element, for controlling the output current regulating element based on the shifted sensing potential level. Under a further aspect, the invention provides a method for providing an output current between a current output terminal and a common potential. The method comprises a step of receiving an input voltage against the common potential, at a voltage input terminal connected to a first end of a sensing resistor, a step of passing the output current from the voltage input terminal through the sensing resistor and an output current regulating element connected between the second end of the sensing resistor and the current output terminal, and a step of shifting a sensing potential level of the second end of the sensing resistor toward the common potential, wherein the output current regulating element is controlled based on the shifted sensing potential level.
Abstract:
The invention provides a driver circuit for driving a lighting device, for being connected between a dimmed supply voltage and said lighting device. The driver circuit comprises a first bleeder resistor, which has a first end connected to a high-voltage terminal of the supply voltage, a second bleeder resistor, which has a first end connected to a low-voltage terminal of the supply voltage, a first semiconductor switching element connected between the second ends of the first and second bleeder resistors, and a second semiconductor switching element connected between the second end of the second bleeder resistor and the low-voltage terminal of the supply voltage. Under a further aspect, the invention provides a method for operating such a driver circuit. The method comprises detecting a predefined low-current phase of an input current of the driver circuit, the input current being below a predefined current threshold and the supply voltage being not below a predefined voltage threshold during the low-current phase. In a further step, upon detecting the low-current phase, a voltage drop across the second bleeder resistor is regulated during the low-current phase.
Abstract:
Provided are a semiconductor device and a method of fabricating the semiconductor device, the semiconductor device including: a source trace, a drain trace, and a gate trace placed on a substrate; a transistor which is placed on the drain trace and includes a source pad and a gate pad; insulating films placed between the drain and source traces and between the drain and gate traces on the substrate so as to cover sidewall surfaces of the transistor; a source spray electrode which is placed on the insulating film between the source and drain traces and connects the source pad of the transistor and the source trace; and a gate spray electrode placed on the insulating film between the gate and drain traces and connects the gate pad of the transistor and the gate trace.
Abstract:
Provided is a solid-state imaging device, which has high sensitivity over a wide wavelength region, ranging from a wavelength of visible light to that of infrared light, a reduced dark current, and a simple structure. A method for manufacturing such device is also provided. The solid-state imaging device is provided with a circuit section (30) formed on a substrate, and a photoelectric converting section (28). The photoelectric converting section is provided with a lower electrode layer (25) arranged on the circuit section (30); a compound semiconductor thin film (24), which has a chalcopyrite structure, and is arranged on the lower electrode layer (25) to function as a light absorbing layer; and a translucent electrode layer (26) arranged on the compound semiconductor thin film (24). The lower electrode layer (25), the compound semiconductor thin film (24) and the translucent electrode layer (26) are stacked on the circuit section (30) in sequence.
Abstract:
Provided is a detecting circuit which can correctly detect a land prepit signal. A threshold value voltage generating circuit (10) detects an amplitude (?V) of a wobble signal (SigWBL) included in a push-pull signal (SigPP), and generates a threshold value voltage (Vth) based on the detected amplitude (?V) of the wobble signal (SigWBL). A first filter (12) removes a high frequency component of the push-pull signal (SigPP), and extracts the wobble signal (SigWBL). A peak hold circuit (14) holds a peak value of the wobble signal (SigWBL) extracted by the first filter (12). A second filter (16) extracts a direct current signal (Sig2), which is a direct current component of the push-pull signal (SigPP). An amplifier (18) amplifies a difference (?V) between an output of the peak hold circuit (14) and an output of the second filter (16), namely, an amplitude of the wobble signal (SigWBL).
Abstract:
An organic EL display device (10) is provided with first and second drivers (1, 2), a multitude of switching circuits (US, DS) and a control circuit (5). The first and second drivers are provided with a multitude of output terminals (P). The multitude of switching circuits alternately connect n-number of the output terminal(s) of the first driver (1) (n is an integer of 1 or more) with one and the other of driving lines, which are of the 2n number of organic EL elements and are divided into two, and alternately connect n-number of the output terminal(s) of the second driver (2) with the remaining n-number of the other and the one of the driving lines. The control circuit (5) controls the multitude of switching circuits to switch at the same time by generating a control signal by m frame(s) (m is an integer of 1 or more) or by m horizontal line(s). Thus, brightness variation and brightness nonuniformity can be reduced.
Abstract:
A semiconductor multilayer portion (6) is formed by stacking an n-type gallium nitride compound semiconductor layer (3) and a p-type gallium nitride compound semiconductor layer (5) so as to form a light-emitting portion, and a light-transmitting conductive layer (7) is formed on a surface of the semiconductor multilayer portion. A part of the light-transmitting conductive layer is removed, and an upper electrode (8) is so formed to be in contact with the exposed surface of the semiconductor multilayer portion and the light-transmitting conductive layer. By providing the surface of the semiconductor multilayer portion which is exposed through an opening (7a) of the light-transmitting conductive layer with a current blocking means (10), current is significantly prevented from flowing into a part under the upper electrode while securing good adhesion between the upper electrode and the surface of the semiconductor multilayer portion. Consequently, there can be obtained a semiconductor light-emitting device using a gallium nitride compound wherein the external quantum efficiency is improved by suppressing light emission under the upper electrode while enhancing adhesion between the upper electrode and the semiconductor layer.
Abstract:
A noncontact IC card where a driver (5) switches the resonance frequency of a resonance circuit (1) in order, a reference voltage generator (6) receives the output voltage of the resonance circuit (1) and outputs a certain reference voltage, an output value measurer (7) measures the magnitude of the output voltage of the resonance circuit (1) at each resonance frequency, with this reference voltage as a reference, an output value storage (8) stores the measurement value (output value), and a mode determiner (9) selects the largest one out of the output values stored in the output value storage (8) and determines the switching mode corresponding to this as an appropriate switching mode. In this way, the noncontact IC card is provided with the appropriate switching mode in which it can receive power supply most efficiently.
Abstract:
A battery charger outputs a high voltage even when the charger is not connected to a power unit provided with a rechargeable battery so that the charger can apply a high voltage to the power unit when the power unit is connected to the output terminal. The charger is provided with a periodic signal generating means which supplies a periodically changing periodical signal to the output terminal and a detecting means which judges whether or not the charger is connected to the power unit by detecting the periodic signal at the output terminal. Therefore, the battery charger can recognize the connecting state of the power unit even when the charger is provided with no mechanical switch.
Abstract:
A picture reading/writing head (1) is provided with an integrated circuit (10) for reading equipped with a plurality of light receiving elements which read a picture on an original (D) by receiving reflected light from the original (D) on a picture reading surface set on one surface of a casing (2) through an optical lens (12), a plurality of heating elements (9) which are arranged on the different surface of the casing (2) from the picture reading surface to form a picture on recording paper by generating heat, and an integrated circuit (11) for writing which drives and controls the elements (9). The integrated circuit (10), the heating elements (9), and the integrated circuit (11) are provided on one main surface of a substrate (7) held on the casing (2) and, at the same time, a reflecting means (13) for making the reflected light passed through the lens (12) incident to the light receiving elements is also provided on the main surface.