Innocom Technology(shenzhen) Co., Ltd.

Hon Hai Precision Industry Co., Ltd.

Hong-fu Jin Precision Industry (shenzhen) Co., Ltd.

Chimei Innolux Corporation

Innolux Display Corporation

Jia-Hui Tu

Tong Zhou

Jin-Liang Xiong

Hua Xiao

Li-Jun Zhao

An exemplary power supply switching circuit () includes a first input () for receiving a first signal, a second input () for receiving a second signal, a voltage regulating circuit (), and a signal switching circuit (). The voltage regulating circuit includes semiconductor elements () electrically coupled in series. The signal switching circuit includes a first input terminal (), a second input terminal (), and an output terminal (). The first input is electrically coupled to the first input terminal via the first voltage regulating circuit, the second input is electrically coupled to the second input terminal, and the output terminal is configured to be an output of the power supply switching circuit. The first voltage regulating circuit regulates the first signal via the voltage drops of the first semiconductor elements. A flat panel display using the power supply switching circuit is also provided.

Power supply switching circuit capable of voltage regulation and flat panel display using same

An exemplary DC to DC converter includes a first transistor, a second transistor, a transformer, and a pulse generating circuit having a first capacitor, a sampling resistor, a zener diode, and a first diode. A DC voltage input terminal is configured for receiving a first DC voltage and is grounded via the primary winding of the transformer, a collector electrode and an emitter electrode of the first transistor in series. A terminal of the auxiliary winding of the transformer is grounded via the inverted first diode, the non-inverted zener diode, the sampling resistor, and the first capacitor. The other terminal of the auxiliary winding is grounded. A first transistor having a base electrode connected to the DC voltage input terminal. A second transistor includes an emitter electrode a cathode of the zener diode, a collector electrode connected to a base electrode of the first transistor, and a grounded base electrode.

DC to DC converter

An exemplary power switching circuit () includes a control signal input terminal (); an output terminal (); direct current (DC) power supply (); a first transistor () including a control electrode connected to the control signal input terminal, a first current conducting electrode, and a grounded second current conducting electrode; a second transistor () including a control electrode connected to first current conducting electrode of the first transistor via a discharging resistor () and a diode () respectively and connected to the DC power supply via a discharging capacitor (), a first current conducting electrode connected to the DC power supply, and a second current conducting electrode connected to the output terminal; and a third transistor () including a control electrode connected to first current conducting electrode of the first transistor, a first current conducting electrode connected to the output terminal, and a second grounded current conducting electrode.

Power switching circuit for liquid crystal display

A drive circuit of a computer system is for driving a mode indicator. The computer system includes a first port and a second port. The mode indicator includes a first receiving end and a second receiving end. The drive circuit includes a first input end connected to the first port, a second input end connected to the second port, a first output end connected to the first receiving end, a second output end connected to the second receiving end. A power supply is connected to the first input end and the second input end via a first resistor and a second resistor respectively. The mode indicator is dichromatic and has two LEDs emitting non-matching colored light.

Drive circuit of computer system for driving a mode indicator

An exemplary backlight control circuit () includes two load circuits (), a pulse width modulation integrated circuit (PWM IC) () having a current sampling pin (), a switching circuit (), a first input circuit () and a second input circuit () including an input resistor. Each load circuit includes a backlight () and an output end (). The first input circuit includes a diode (), a resistor (), a capacitor () and a voltage division resistor (). A negative terminal of the diode is connected to ground via the resistor and the capacitor respectively, and is connected to the switching circuit. A positive terminal of the diode is connected to one of the output end of the load circuits. The other one of the output ends of the load circuits is connected to the current sampling pin via the input resistor.

Backlight control circuit with two transistors

A drive circuit of a computer system is for driving a mode indicator. The computer system includes a first port and a second port. The mode indicator includes a first receiving end and a second receiving end. The drive circuit includes a first input end connected to the first port, a second input end connected to the second port, a first output end connected to the first receiving end, a second output end connected to the second receiving end, a power supply, a first transistor connected between the first input end and the power supply, and a second transistor connected between the second input end and the power supply. Collectors of the first and second transistors are separately connected to the first and second output ends. The mode indicator is dichromatic and has two LEDs emitting non-matching colored light.

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Shenzhen, China

Jia-Hui Tu