Abstract: A 3D grid controllable liquid crystal lens is provided. In the 3D grid controllable liquid crystal lens, at least two layers of a plurality of active device arrays are stacked on a first substrate, and a plurality of liquid crystal layer are respectively disposed on the active device arrays. Then, a driving voltage applied on each active device array is suitably controlled to control the orientation of the liquid crystal molecules, so as to generate a refractive index distribution similar to gradient-index lens in the 3D grid controllable liquid crystal lens. Therefore, the 3D grid controllable liquid crystal lens has a focusing function for focusing/diverging the light, similar to a convex lens or a concave lens. A method for manufacturing the 3D grid controllable liquid crystal lens is also provided.

Abstract: Disclosed herein are various embodiments of systems and methods that may be utilized in a variety of videoconferencing applications. According to various embodiments, techniques may be utilized to dynamically allocate and adjust bandwidth utilization during a videoconferencing session. A data network may allow for the transmission of data between two or more endpoints. The data exchanged between the endpoints may include video data, audio data, control data, and status data. Control data may be utilized in various embodiments to operate a robotic videoconferencing endpoint. Accordingly, various components of a data network connecting videoconferencing endpoints may transmit data wirelessly.

Abstract: An improved method for encoding and decoding data, such as in a base64 system, uses multiple look-up tables to perform the encoding function and to eliminate or reduce bit-shifting and the bit masks in encoding systems through use of pre-populated look-up tables. One example application is converting between media data that is typically quickly viewable on a media device and ASCII or similar data useful in data transfers, such as email. In specific embodiments, a series of pre-fetch encode and decode tables are constructed and indexed to fetch pre-calculated values to, for example, rapidly encode and decode any number of bit representations into any other bit representations.

Abstract: A control circuit for controlling an LED device according to an input data signal and a clock signal is disclosed. The control circuit includes at least one first control module. The first control module includes a shift register unit, a latch register unit, an LED driving circuit, and a latch signal generator. The shift register unit includes at least one shift register and is triggered by the clock signal for buffering data transmitted in the input data signal. The latch register unit includes at least one latch register and is triggered by a latch signal for latching data buffered by the shift register. The LED driving circuit is utilized for driving the LED device according to data latched by the latch register. The latch signal generator is used to generate the latch signal according to the input data signal and the clock signal.

Abstract: A multi-channel display driver circuit incorporating modified D/A converters has a plurality of digital comparators connected to a number generator. Each digital comparator has an output, a digital data input and a reference input. The reference inputs of all digital comparators are connected to the number generator and the outputs are respectively connected to corresponding data channels of a display. By the proposed technique, each digital comparator obtains a unique non-sequence reference signal, and then compares it with the input digital data signal. Since the non-sequential signals are input to the reference input of the digital comparator, the overshoot distortion, the harmonic distortion and the electromagnetic interference problems are prevented. Therefore, the precise imaging can be obtained with this signal modulation technique in small circuit size.

Abstract: A method for converting an input voltage signal into an output voltage signal is disclosed. The method includes: providing a primary converting module and coupling the primary converting module to an input port of the voltage converter; providing a secondary converting module having a second electronic induction device and a switch device, coupling the secondary converting module to an output port of the voltage converter, and utilizing the switch device to enable the secondary converting module; measuring a slope of an output at a detection end of the second electronic induction device to generate a slope indication signal having different pulse amplitudes representative of different slope values; and referencing the output at the detection end of the second electronic induction device, the slope indication signal, a first predetermined reference level, and a second predetermined reference level to generate a control signal for controlling an on/off status of the switch device.

Abstract: A control module for reducing power dissipation is connected to a column driving unit and a row driving unit. The control module includes a memory for storing display data temporarily and an arithmetic/logic unit connected to the memory. The arithmetic/logic unit takes grayscale image data of a current conducted row as a base row to compare with the grayscale image data of n rows that are temporarily stored in the memory and waiting to be scanned, so as to select the row with a minimum gray level difference as a next conducted row.

Abstract: A piezoelectric actuator system with a position detection function includes an immovable base, a piezoelectric material, a drive shaft, and a movable part. The immovable base has a driving circuit for providing a driving voltage. The piezoelectric material is fixed on the immovable base and electrically coupled to the driving circuit. A length of the piezoelectric material is controlled by the driving voltage. The drive shaft is fixed on the piezoelectric material and has at least two conductive parts having impedance materials. The movable part is disposed on the drive shaft, and a spacer made of a conductive material is installed at its bottom. The two conductive parts are electrically coupled to the spacer, so as to form a conduction path. The driving circuit detects an impedance of the conduction path to determine a position of the movable part.

Abstract: A chain-chopping current mirror and a method for stabilizing output currents are disclosed. The current mirror includes multiple output nodes, a bias source unit, multiple current mirroring units and multiple switch components. The bias source unit provides a reference bias according to the received current. Each of the current mirroring units outputs an output current according to the reference bias. The control terminal of each the switch component receives a clock signal and determines whether the first terminal thereof is coupled with the second terminal or the third terminal thereof according to the clock signal, wherein the first terminal of the ith switch component is coupled with the output terminal of the ith current mirroring unit, the second terminal thereof is coupled with the ith output node and the third terminal thereof is coupled with the (i+1)th output node, where i is a natural number.

Abstract: A multi-channel display driver circuit incorporating modified D/A converters has a plurality of digital comparators connected to a number generator. Each digital comparator has an output, a digital data input and a reference input. The reference inputs of all digital comparators are connected to the number generator and the outputs are respectively connected to corresponding data channels of a display. By the proposed technique, each digital comparator obtains a unique non-sequence reference signal, and then compares it with the input digital data signal. Since the non-sequential signals are input to the reference input of the digital comparator, the overshoot distortion, the harmonic distortion and the electromagnetic interference problems are prevented. Therefore, the precise imaging can be obtained with this signal modulation technique in small circuit size.

Abstract: A GAMMA adjustment method for a multi-channel driver of a monitor and device thereof are provided. The GAMMA adjustment method converts an m-bit input signal of a high bit signal corresponding to an m-bit simulated GAMMA curve into an n-bit signal of a low bit signal. Then the n-bit signal together with an n-bit input signal are input to a driver component. The driver component compares the two low-bit signals to generate a PWM driver signal supplied to a data channel of the monitor. Since the two n-bit signals of the driver component are of low quantity bit, the driver chooses n-bit digital driver components to greatly reduce an overall layout area of the driver and further to reduce manufacture cost.

Abstract: An auto-range current mirror circuit has a current sensing circuit, a front and rear stage current mirrors each has an adjustable amplifying rate. The current sensing circuit presets a threshold current and has an input current of the front stage current mirror. The current sensing current compares the input current with a threshold current and then outputs a controlling signal to the front and rear stage current mirrors to adjust a suitable amplifying rate. Therefore, a bias current of the rear stage current mirror is amplified by the suitable amplifying rate to improve the quality of output current of the rear stage current mirror.

Abstract: Methods and apparatus for an image server surveillance system provide for as control and coordination of cameras that may be widely deployed, analyzing data from multiple cameras, making data available in such a way that it can be efficiently transmitted over a network and can be easily displayed to potentially a large number of users, and displaying and controlling image data by existing client software.

Abstract: Methods and apparatus for an image server surveillance system provide for as control and coordination of cameras that may be widely deployed, analyzing data from multiple cameras, making data available in such a way that it can be efficiently transmitted over a network and can be easily displayed to potentially a large number of users, and displaying and controlling image data by existing client software.

Abstract: An method and/or apparatus for representing and/or operating on numerical values in binary systems whereby numerical values having integer and fractional portions are stored in non-contiguous memory locations.

Abstract: Methods and apparatus for an image server surveillance system provide for as control and coordination of cameras that may be widely deployed, analyzing data from multiple cameras, making data available in such a way that it can be efficiently transmitted over a network and can be easily displayed to potentially a large number of users, and displaying and controlling image data by existing client software.

Abstract: An improved method for determining character codes for a numerical value retrieves two or more character codes for each iteration of the method.

Abstract: A motor speed control having synchronous PWM signals has a synchronous phase detecting unit and a PWM control unit. The synchronous phase detecting unit detects the phase variation of a Hall signal, which represents the phase change of the motor, and outputs a digital value to the PWM control unit. The PWM control unit compares the digital value with a speed control command so as to obtain a PWM signal, wherein the PWM signal is synchronized with the Hall signal. Since the PWM signal is synchronized with the Hall signal, the motor is operated smoothly even in the low speed rotation, and audible noises are effectively reduced.

Abstract: A power polarity reversal protecting circuit for an integrated circuit includes a protecting transistor, PMOS components and NMOS components, wherein the protecting transistor is a protecting PMOS transistor or a protecting NMOS transistor. If the protecting transistor is the PMOS transistor, a gate and a source of the protecting PMOS transistor are respectively connected to ground and power. A drain and a substrate of the protecting PMOS transistor is connected to a substrate of the PMOS component. If the protecting transistor is the protecting NMOS transistor, a gate and a source of the protecting NMOS transistor are respectively connected to power and ground. A drain and a substrate of the protecting NMOS transistor is connected to a substrate of the NMOS component. When the power polarity is in reversal connection, the protecting transistors are terminated to prevent damage from the power polarity reversal connection.

Abstract: A fan linear speed controller is disclosed, which controls the rotation speed of a fan by an external fan control voltage. The fan linear speed controller includes a temperature sensor unit, a linear speed control unit and a fault detection unit. The temperature sensor unit has a thermistor for detecting the ambient temperature of the fan to generate a thermally sensitive voltage. The linear speed control unit receives the external fan control voltage and the thermally sensitive voltage to generate an output voltage for driving the fan. The output voltage is proportional to the fan control voltage when the thermally sensitive voltage is lower than a preset threshold voltage and the fan control voltage is higher than a preset reference voltage. The fault detection unit receives the thermally sensitive voltage and a rotation speed signal generated by the fan to selectively produce a fault signal indicating that the rotation of the fan is abnormal or the ambient temperature of the fan is too high.