Orise Technology Co., Ltd.

Focaltech Systems Co., Ltd.

Chien-Chun Huang

Yen-Cheng Cheng

Yang-Cheng Cheng

Kuan-Han Chen

A source driving apparatus with power saving mechanism and a flat panel display using the same are provided. The source driving apparatus includes an output buffer stage and a power-saving circuit. The output buffer stage operates under a dual power, and has a positive and negative output channels respectively coupled to two adjacent data lines in a display panel. Moreover, the power-saving circuit is coupled between the output buffer stage and the display panel. The power-saving circuit collects charges from an equivalent load capacitor of each data line, before the output buffer stage drives the two adjacent data lines through the positive and negative output channels. The power-saving circuit charges one of a positive supply and a negative supply of the dual power in response to the collected charges, during the output buffer stage drives the two adjacent data lines through the positive and negative output channels.

Source driving apparatus with power saving mechanism and flat panel display using the same

An operational amplifying device with auto-adjustment output impedance includes an operational amplifier and first to third signal paths. The operational amplifier has an output connected to its inverting input, and a non-inverting input for receiving an input signal. The first signal path has one end connected to the output of the operational amplifier and the other end connected to a first output node. The second signal path has one end connected to the output of the operational amplifier and the other end connected to the first output node. The third signal path has one end connected to the output of the operational amplifier and the other end connected to the first output node. The first signal path is normally on, and the second and third signal paths are normally off. The first signal path has high impedance, and each of the second and third signal paths has low impedance.

Operational amplifying device with auto-adjustment output impedance

A unity-gain buffer includes an operational amplifier, a control stage, and an auxiliary output stage. The operational amplifier includes a non-inverting input terminal, an output terminal, and an inverting input terminal. The control stage is connected between the non-inverting input terminal and the output terminal of the unity-gain buffer. The auxiliary output stage is connected between the control stage and the output terminal of the unity-gain buffer. According to an input voltage at the input terminal of the unity-gain buffer, the control stage generates a first driving current, the auxiliary output stage generates a second driving current, and the operational amplifier generates a third driving current, so that an overall driving current outputted from the output terminal of the unity-gain buffer is equal to the sum of the first driving current, the second driving current and the third driving current.

Unity-gain buffer with enhanced slew rate

A charge-sharing control method for a display panel includes the following steps. Firstly, a first switch set is turned on, so that a first voltage driving unit provides a first positive driving voltage to a first data line and a second voltage driving unit provides a first negative driving voltage to a second data line. Then, a second switch set is turned on, so that a first charge storage unit has a positive common voltage and a second charge storage unit has a negative common voltage. Then, a third switch set is turned on, so that the first data line and the second data line are electrically connected with a ground voltage. After a polarity inversion, the second data line is charged according to a first comparison result and the first data line is discharged according to a second comparison result.

Control device and control method for display panel

A wide range level shift system receives an input signal with a first voltage level and a second voltage level. The wide range level shift system transforms the input signal to an output signal with a third voltage level and a fourth voltage level, wherein the first voltage level is smaller than the second voltage level, the second voltage level is smaller than the third voltage level, and the fourth voltage level is smaller than the first voltage level. The wide range level shift system reduces the number of transistors required, the layout area of the transistors, and the power consumption.

Wide range level shift system

Level shifter and related apparatus are provided. The level shifter has first to sixth transistors, wherein drains of the first and the second transistors respectively are coupled to drains of the fifth and the sixth transistors as two output nodes of the level shifter, gates of the fifth and the sixth transistors are two input nodes of the level shifter. A source, a drain and a gate of the third transistor are respectively coupled to a gate of the first transistor, the drain of the sixth transistor and a first bias voltage, and a source, a drain and a gate of the fourth transistor are respectively coupled to a gate of the second transistor, the drain of the fifth transistor and a second bias voltage.

Growing community of inventors

Hsinchu, Taiwan

Chien-Chun Huang