626 results about "Current driver" patented technology

A drive circuit for a display apparatus includes a gradation voltage generation circuit and a D/A conversion circuit. The gradation voltage generation circuit generates a plurality of different first gradation voltages and a plurality of different second gradation voltages. The D/A conversion circuit drives a light emitting element of a pixel through a data line with a gradation voltage based on one of the first gradation voltages as a first specific gradation voltage in a precharge period and drives the light emitting element of the pixel through the data line with a gradation current based on one of the second gradation voltages as a second specific gradation voltage. The D/A conversion circuit includes a voltage driver to drive the light emitting element, and a current driver to drive the light emitting element.

A semiconductor device to which active drive current programming is applied, comprising current load cells each having a current load and a current load driving circuit, which are arranged in a matrix, capable of reducing the circuit scale of a current driver with little change made in the structure of the current load driving circuit, and a driving method of the same.

A current load cell (113, 114) includes a current load driving circuit which is provided with a transistor (115) connected in series with a current load (122) between first and second power supplies (109, 110); a capacitance (116) connected between the control terminal of the transistor (115) and the first power supply (109); and switches (117, 118) connected between the control terminal of the transistor (115) and a corresponding data line. The output (101) of a current driver is connected to a plurality of data lines via a selector (123, 124), and the plural data lines connected to one output of the current driver via the selector and at least one of the switches of each of the current load cells corresponding to the respective data lines are drive-controlled in a time division manner during one horizontal period.

A power saving device for a light emitting diode (LED) lamp mounted to an existing fixture for a fluorescent lamp having a ballast assembly and LEDs positioned within a tube and electrical power delivered from the ballast assembly to the LEDs. The LED lamp includes means for controlling the delivery of the electrical power from the ballast assembly to the LEDs wherein the use of electrical power can be reduced or eliminated automatically during periods of non-use. Such means for controlling can include an on-off switch mounted in the tube or can also include a current driver dimmer mounted in the tube that regulates the amount of power delivered to the LEDs. A computer or logic arrays control the dimmer or power switch. A sensor such as an occupancy motion detection sensor mounted external to the tube or within the tube can send signals to the computer or logic array to trigger a switch or control a dimmer. Two or more such LED lamps with one or more computers or logic arrays in network communication with sensors can be controlled, so as to reduce flickering between lamps when illumination areas are being alternately occupied. Preset or manually set timers can control switches or be used in combination with the computer, logic array, and dimmer.

A pixel current driver comprises a plurality of thin film transistors (TFTs) each having dual gates and for driving OLED layers. A top gate of the dual gates is formed between a source and a drain of each of the thin film transistors, to thereby minimize parasitic capacitance. The top gate is grounded or electrically tied to a bottom gate. The plurality of thin film transistors may be two thin film transistors formed in voltage-programmed manner or five thin film transistors formed in a current-programmed ΔV_T-compensated manner. Other versions of the current-programmed circuit with different numbers of thin film transistors are also presented that compensate for δV_T. The OLED layer are continuous and vertically stacked on the plurality of thin film transistors to provide an aperture ratio close to 100%.

A driving circuit in an organic electroluminescent device includes a gate driver unit for sequentially outputting a control signal to select gate lines in a luminescent array unit and a current driver unit for supplying picture data to a data lines in the luminescent array unit corresponding to the gate lines selected by the gate driver unit and selectively driving organic electroluminescent devices of the selected line. The driving circuit includes a minimum gray level judgment unit for determining whether the picture data is of a predetermined minimum gray level; and a switching unit for receiving a control signal according to the determination made by the minimum gray level judgment unit and for selectively supplying a reference voltage or a reference current to the selectively driven organic electroluminescent devices.

[Problems] There are provided a device and a method for telephone countermeasure in using a telephone during driving which can automatically suppress communication of only a driver in a vehicle.

[Means For Solving Problems] The device for telephone countermeasure includes a database (3), a driver judgment unit, and a mode switching unit. The database (3) contains driver face data (3-1) and a telephone number (3-2) of a mobile telephone (7) used by the driver for each of the drivers. The driver judgment unit identifies the current driver of the vehicle in the database (3) by the face authentication. The mode switching unit extracts the telephone number (3-2) of the mobile telephone (7) used by the identified driver from the database (3) and switches the mobile telephone (7) of the driver to a drive mode such as a message recording mode by using the telephone number.

A programmable LED constant current driver circuit for driving LEDs at constant current and dimming the LEDs using standard, off-the-shelf dimmers is provided. The current driver circuit of the present disclosure includes a temperature compensation feature which controls the on time for the LEDs based on a measured temperature of the current driver and associated circuits. In another embodiment, the current driver circuit is designed to receive a 24 VAC input and drive one or more LEDs in a transformer-based system dimming system.

The disclosure is directed at a configurable light emitting diode (LED) driver/dimmer for controlling a set of light fixture loads comprising: a power circuit; a primary digital controller for controlling the power circuit; a set of output current drivers, each of the set of output current drivers connected to one of the set of light fixture loads for controlling the associated light fixture load; a secondary digital controller for controlling the set of output current drivers; wherein the secondary controller transmits LED control information to control outputs of the set of output current drivers; and wherein the secondary digital controller provides digital feedback control information to the primary digital controller.

A method of writing data on magnetic stripe of a smart card by imposing a magnetic field of a given polarity on each selected segment of the magnetic stripe, such that data on the magnetic stripe can be read by a magnetic card reader and interpreted as digital bits. The method includes providing a multi-dimensional conductor array placed proximate to the magnetic stripe, the number of conductors in the array is considerably smaller than the number of segments, and each segment is associated with two or more conductors. The method further includes providing current drivers for sending currents in a controlled direction through the conductor array. The system further includes sending currents, using said current drivers, through conductors of the array, such that for each one of the selected segment composite currents flowing through its associated two conductors overcome the coersivity of the segment on the magnetic stripe.

A wellbore tool for locating a target wellbore containing a conductive member from a second wellbore and directing the trajectory of the second wellbore relative to the target wellbore includes an electric current driver having an insulated gap; a three-axis magnetometer positioned within a non-magnetic housing that is disposed within a non-magnetic tubular, the three-axis magnetometer positioned below the electric current driver; a drill bit positioned below the three-axis magnetometer; a hollow tubular connected between the electric current driver and the three-axis magnetometer; and a measurement-while-drilling tool. The current driver generates an electric current across the gap to the portion of the tool below the insulated gap. In a method a current is generated across the insulated gap to the portion of the tool below the insulated gap to the conductive material in the target wellbore returning to a portion of the bottom hole assembly above the insulated gap thereby producing a target magnetic field. Measuring the target magnetic field at the bottom hole assembly and the earth's magnetic field; and determining the position of the second wellbore relative to the target wellbore. Then steering the bottom hole assembly to drill the second wellbore along a trajectory relative to the target wellbore.

A light emitting diode (LED) based light engine that can replace a conventional PAR type bulb with no modifications to a host lighting fixture is provided. The light engine includes a thermally conductive housing including a generally cylindrical wall defining a cavity, an outer surface of the wall includes a plurality of axially radiating fins and disposed on an inner surface of the wall is an annular center wall dividing the cavity into a first, upper cavity and a second, lower cavity; a light module including at least one LED is disposed in the first, upper cavity and configured to contact the annular center wall, wherein heat generated by the at least one LED is conducted to the housing; and a current driver circuit arranged on a substrate is disposed in the second, lower cavity and electrically coupled to the light module.

An LED lamp module designed to be easily retrofitted into existing incandescent based light fixtures with minimum modification is provided. The LED lamp module includes a generally circular metal core board including a first surface and a second surface; at least one LED disposed centrally on the first surface of the metal core board; and a flat annular printed circuit board including a current driver circuit for powering the at least one LED, the annular printed circuit board being disposed around the at least one LED and electrically coupled to the at least one LED, wherein the second surface of the metal core board is configured to contact a host fixture and heat generated by the at least one LED is conducted to the host fixture. The LED lamp module uses the host light fixture as a heat sink to transfer and dissipate heat to the external environment.

A semiconductor memory device includes memory cells, first wirings, a first current driver circuit, and a second current driver circuit. The memory cell includes a magneto-resistive element having a first ferromagnetic film, an insulating film formed on the first ferromagnetic film, and a second ferromagnetic film formed on the insulating film. The first wiring is provided in close proximity to and insulated from the magneto-resistive element. The first current driver circuit supplies a first current to the first wiring in a write operation to produce a magnetic field around the magneto-resistive elements. The second current driver circuit supplies a second current between the first and second ferromagnetic films via the insulating film in a write and a read operation.

In system and methods for theft prevention or mitigation, driver-related data associated with one or more authorized drivers of an insured vehicle may be collected over time. The authorized drivers and the insured vehicle may be covered by an insurance policy issued by an insurance provider. Based upon the collected driver-related data, a database associated with the authorized drivers may be built. Current driver-related data associated with an individual currently driving, attempting to start, or sitting in a seat of the insured vehicle may be collected. It may be determined, using both the database and the current driver-related data, that the individual is not among the authorized drivers. A disablement of an operation of the insured vehicle may be caused, and/or the individual may be caused to be prevented from starting or otherwise operating the insured vehicle, to facilitate preventing or mitigating theft of the insured vehicle.

To maintain consistency in different environments with different impedances, a high voltage current driver may be used as a signal generator to output a tactile signal with a constant current. The constant current ensures that the voltage between the user's finger and the object's surface or electrode remains the same even if impedances in the electrical path change. Specifically, the current driver includes a current sensing circuit that determines the average current being generated. Using a feedback loop, the measured current is compared to a reference current to determine if the correct tactile sensation is perceived by the user. As the impedance changes, the current driver detects the resulting change in the signal's current and adjusts the voltage amplitude of the generated tactile signal in order to match the measured current to the reference current.

An organic EL display apparatus includes: a display panel on which a plurality of pixel sections are provided; source drivers provided with pixel drivers, which includes current drivers for supplying drive currents to the pixel sections, registers for latching data signals and timing control units; signal lines for supplying the drive currents from the current drivers to the pixel sections. Each of the current drivers is controlled by the associated timing control unit to allow a current larger than or equal to a current which is set in accordance with the data signal to flow only during a given period in a current setting mode, so that the value of a current flowing in the pixel section reaches a target value in a short time.

First and second current drivers are connected to one end of corresponding first and second write bit lines, respectively, and the first and second write bit lines are directly connected, at the other end, to a common line. The first and second current drivers receive a first power supply voltage and the ground voltage, while the common line receives a second power supply voltage higher than the ground voltage and lower than the first power supply voltage. The first and second current drivers cause a current for data writing to flow in a first direction based on a voltage difference between the first power supply voltage and the second power supply voltage, and cause a current for data writing to flow in a second direction based on a voltage difference between the second power supply voltage and the ground voltage.