Abstract: A driving apparatus used for driving a light source is provided. The driving apparatus includes a signal processing unit, a control unit, and a driving unit. The signal processing unit generates an enabling signal and a dimming signal according to an input signal. The control unit includes an enabling module and a dimming module. The enabling module enables the driving apparatus according to the enabling signal, and the dimming module generates a dimming driving signal according to the dimming signal. The driving unit adjusts the brightness of the light source according to the dimming driving signal.

Abstract: An electronic ballast comprising a pulse width modulation (PWM) unit and a power-converting unit is provided. The PWM unit is used for generating a PWM signal to the power-converting unit so that the power-converting unit can generate a driving signal to drive and light up the fluorescent lamp according to the PWM signal. Specially, the duty cycle of the PWM signal is varied with time in a pre-heating period of the fluorescent lamp. In addition, the present invention further includes a detecting module for detecting a working voltage and a working current of the fluorescent lamp to determine whether the fluorescent lamp works normally. When the fluorescent lamp cannot work normally, the PWM signal generated by the PWM unit is disabled through the detecting module.

Abstract: A voltage-controlled current source and a frequency scanner using the same are provided. The voltage-controlled current source includes an impedance circuit, an amplifier, a transistor, and a current mirror. A first terminal of the impedance circuit is coupled to a common voltage. A first terminal of the amplifier is coupled to a second terminal of the impedance circuit, and a second terminal of the amplifier receives a control voltage. A gate of the transistor is coupled to an output terminal of the amplifier, and a first source/drain of the transistor is coupled to the other terminal of the impedance circuit. The current mirror is coupled to a second drain/source of the transistor, and includes a current output terminal, wherein a current output by the current output terminal is proportional to the current flowing through the transistor.

Abstract: An electronic apparatus for current source array and the layout method thereof are provided. The current source array includes a low bit group and a plurality of high bit groups. The low bit group has a plurality of current source units and is disposed at a central block of a layout area. In addition, each of the high bit groups has a plurality of current source units respectively disposed at a plurality of peripheral blocks of the layout area.

Abstract: The invention provides signal synchronization systems. The signal synchronization system comprises a plurality of synchronization units and a control unit. The synchronization units each correspond to one transmitting device for accurately transmitting the transmitted data from the transmitting devices to the control unit. The control unit generates a system clock and a data selection signal according to the amount of the transmitting devices. The system clock has to be fast enough to be capable of receiving data from all transmitting devices. The transmitted data is transmitted to the control unit according to the order shown in the data selection signal. The control unit integrates the received data in a single signal named system data signal and further generates a data selection signal to designate a plurality of receiving devices to receive the data in the system data signal.

Abstract: A signal level adjusting apparatus is provided. The signal level adjusting apparatus uses a clamping circuit as an automatic level adjusting apparatus to adjust a signal level. Then, a peak or a valley voltage of a driving signal output from the signal level adjusting apparatus can be confined in a predetermined voltage value range. The present invention adjusts an input driving signal automatically according to the predetermined voltage value so as to output an organic light emitting diode (OLED) driving signal suitable for driving various OLEDs and various OLED displays or output a light emitting diode (LED) driving signal suitable for driving various LEDs. Additionally, the present invention further comprises a power amplifier circuit, which is suitable for enhancing a driving ability of the level adjusting apparatus.

Abstract: A power supply and a switch apparatus are disclosed. The power supply is designed for providing a liquid crystal display with a power source. In the present invention, a bouncing switch is used for power-on and power-off functions. When the bouncing switch is activated, the power to the main system is also activated and the supply of power to the main system is maintained. A controller of the main system is then activated to acquire an authorization for controlling the power to the main system so that power is continuously supplied to the main system. Then, the main system sequentially activates the power supply of each sub-system. If the bouncing switch is activated by a second triggering, the main system may sequentially turns off the power module inside each sub-system. Finally, the power to the main system is shut down to lower the static power consumption of the whole system.

Abstract: A loading system and a controller thereof are disclosed. The controller includes an adjustable triangle wave generator, an error signal generator, and a pulse signal generator. The triangle-wave generator is adapted to perform an amplitude and frequency operation according to the reference voltage and the feedback voltage for generating an amplitude-frequency adjustable triangle wave according to a variation of the feedback voltage. The error signal generator is adapted to perform an error operation according to the feedback voltage and the reference voltage for outputting an error signal. The pulse signal generator is adapted to receive and compare the error signal and the amplitude-frequency adjustable triangle wave for outputting a pulse controlling signal for the loading system.

Abstract: The invention relates to an analog-to-digital converter comprising a reference voltage generating circuit, two coarse/fine comparators and two encoders for encoding the comparison result of the two coarse/fine comparators. In the invention, the two coarse/fine comparators processes a coarse comparison procedure and a fine comparison procedure on an input voltage in different clock cycle, thus, a sampling voltage error caused by an error of sampling time decreases. In another aspect of the invention, the capacitance of the input capacitor of the analog-to-digital converter decreases because the comparators for coarse comparison and fine comparison are the same, thus, a large power amplifier is not required for driving the input capacitor.

Abstract: A controller comprises an error comparator, a frequency generator, a pulse-width modulator and an output driver. The error comparator generates an error signal according to a feedback signal and a reference voltage. The frequency generator provides a frequency signal. The pulse-width modulator coupled to the error comparator and the frequency generator generates a pulse-width modulated signal according to the error signal and the frequency signal. The output driver coupled to the pulse-width modulator generates at least one switch signal according to the pulse-width modulated signal. Because the frequency signal is within at least one of the first predetermined bandwidths of the frequency range during a second predetermined time interval is within a third predetermined number, beat frequency interference is not detectable by users.

Abstract: A variable gain device having higher linearity and wider gain range is provided. The variable gain device includes a transduction unit for generating an output current, a control unit for adjusting the current gain of the gain amplifying unit according to a gain control signal, a gain amplifying unit receiving the current signal and generating a gain adjustable current according to the current gain of the control unit, an output DC level control unit controlling the DC level of the output signal of the variable gain device, and an output unit generating an output signal according to the signals output by the output DC level control unit and the gain amplifying unit.

Abstract: A DC/DC converter comprises a switch device, an inductor, a rectifying device and a capacitor. Switch device has a first terminal coupled to a DC power supply and a control terminal receiving a control signal. Inductor has a first terminal electrically coupled to a second terminal of switch device. Rectifying device has a first terminal electrically coupled to the first terminal of inductor. Capacitor has a first terminal electrically coupled to a second terminal of rectifying device, a second terminal electrically coupled to a second terminal of inductor. Switch device is switched between a first and second states based on control signals, the power of DC power supply is stored into inductor when switch device is in the first state; the power stored in inductor is released and provided to capacitor and LED module through rectifying device when switch device is in the second state.

Abstract: The invention provides an LED current balancing circuit, comprising a first and a second LED set coupled to a voltage source, a first transistor, and a second transistor. The first LED set comprises a first loader. The first transistor and the second transistor form a current balancing circuit for adjusting currents passing through the first and second LED sets.

Abstract: A method for reducing the size of an image suitable for an image data having a plurality of pixels is provided. The method of the present invention comprises the following steps. First, an image data is divided into a plurality of sampling areas, and each sampling area has a predetermined number of pixels. When the image data is an odd field, a right weighting for each pixel in every sampling area is configured according to a first predetermined ratio, such that each sampling area is able to generate a first sampling pixel. When the image data is an even field, a right weighting for each pixel in every sampling area is configured according to a second predetermined ratio, such that each sampling area is able to generate a second sampling pixel. Then, a new image data is generated according to the first and second sampling pixels.

Abstract: The invention provides an image processing method and device to determine whether the timing signal is abnormal by detecting timing signal related to the image signal output to the display. When the timing signal is abnormal, the display receives no the timing signal related to the image signal. The horizontal synchronous signal and vertical synchronous signal prevent the elements in the display, such as electron gun, from operating with abnormal signals, enhancing display lifetime.

Abstract: A low visual noise, jitterized pulse width modulation brightness control circuit is provided. The circuit uses a brightness control signal generating unit to receive a brightness adjusting signal and to generate a brightness control signal in response to the brightness adjusting signal. The brightness control pulse signal has a duty cycle or frequency varying in a predetermined range. An inverter coupled to the brightness control signal generating unit drives the fluorescent lamp in response to the brightness control pulse signal to reduce the visual interference due to the adjustment of the current beam density.

Abstract: A pulse width modulation inverter circuit is provided. The circuit includes a power switch driver, a power switch, a transformer unit, a feedback detector unit, and a voltage control oscillator. The circuit is electrically coupled to the DC power source to drive a load. The circuit adjusts the pulse width of the signal outputted from the power switch driver according to the voltage inputted to the DC power source. Accordingly, the circuit can maintain a fixed input voltage received by the fluorescent tube. Thus, the high input voltage but low output phenomenon can be avoided.

Abstract: A signal synchronization device and signal synchronization method are provided. The method comprises determining whether a receiving device can receive data output from an output device synchronously and adjusting the dummy period of the signal, which will be received by the receiving device, when the data output from the output device cannot be received by the receiving device synchronously.

Abstract: An image processing module substantially matches the representation of a display with the expectation of image data. The image processing module comprises a storage unit, a control unit, and an image processing unit. The storage unit stores calibration information with calibration values each corresponding to a physical area on the display. The control unit receives timing data and mode data to accordingly direct the storage unit to output corresponding calibration value. An image processing unit is controlled by the control unit to calibrate the image data according to the corresponding calibration value and output calibrated image data.

Abstract: A video processing method and apparatus to employing an analog user interface and a digital video decoder. A working mode is provided, according to which analog control signals from the analog user interface are selectively directed to an analog-to-digital converter. The analog control signal is converted to digital control signal to accordingly control the digital video decoder.