Abstract: A driving circuit includes a first PWM driving module and a second PWM driving module. The first PWM driving module generates a first square-wave signal to drive a first illumination unit according to a first data signal of a data stream, wherein the first square-wave represents an illumination period of the first illumination unit in a display cycle. The second PWM driving module generates a second square-wave signal to drive the second illumination unit according to a second data signal of the data stream, wherein the second square-wave signal, which has a different phase with the first square-wave signal, represents an illumination period of the second illumination unit in the display cycle.

Abstract: A driving circuit includes a first PWM driving module and a second PWM driving module. The first PWM driving module generates a first square-wave signal to drive a first illumination unit according to a first data signal of a data stream, wherein the first square-wave signal, having a rising edge located at the beginning of the display cycle, represents an illumination period of the first illumination unit in a display cycle. The second PWM driving module generates a second square-wave signal to drive a second illumination unit according to a second data signal of the data stream, wherein the second square-wave signal, having a falling edge located at the end of the display cycle and having a rising edge being behind the rising edge of the first square-wave signal, represents an illumination period of the second illumination unit in the display cycle.

Abstract: A driving circuit includes a first PWM driving module and a second PWM driving module. The first PWM driving module generates a first square-wave signal to drive a first illumination unit according to a first data signal of a data stream, wherein the first square-wave represents an illumination period of the first illumination unit in a display cycle. The second PWM driving module generates a second square-wave signal to drive the second illumination unit according to a second data signal of the data stream, wherein the second square-wave signal, which has a different phase with the first square-wave signal, represents an illumination period of the second illumination unit in the display cycle.

Abstract: A driving circuit includes a first PWM driving module and a second PWM driving module. The first PWM driving module generates a first square-wave signal to drive a first illumination unit according to a first data signal of a data stream, wherein the first square-wave signal, having a rising edge located at the beginning of the display cycle, represents an illumination period of the first illumination unit in a display cycle. The second PWM driving module generates a second square-wave signal to drive a second illumination unit according to a second data signal of the data stream, wherein the second square-wave signal, having a falling edge located at the end of the display cycle and having a rising edge being behind the rising edge of the first square-wave signal, represents an illumination period of the second illumination unit in the display cycle.

Abstract: An external adapter circuitry is plugged into the printer port of a host computer to provide the utility of computer telephony for the host computer. The circuitry is housed in a compact box which is about the size of a common parallel port connector. The circuitry consists of a telephone line interface for receiving and sending signals from/to the telephone line; a printer port interface for sending data to and receiving data from the host computer; a couple of registers for latching signal-in and signal-out; a A/D converter for converting analog signals to digital signals; and a D/A converter for converting digitized signals to analog signals. More specially, the electricity of the entire circuitry is supplied from a signal-to-power converter which obtains voltages from the printer port. Therefore, the external adapter circuitry does not need a power line for external power supply.