Himax Technologies, Inc.

Yu-Jui Chang

Ying-Lieh Chen

Chuan-Che Lee

Tsung-Yu Wu

Lin-Kai Bu

Chien-Ru Chen

Wen-Teng Fan

Pen-Hsin Chen

Hsiao-Lan Su

Kuan-Sheng Huang

The present invention discloses a source driver and a method for restraining noise output by a source driver during power on/off of a power supply. The source driver includes a data bus, a plurality of channels, a multiplexer and a plurality of output pads. The channels are connected to the output pads via the multiplexer. Each channel has a latch unit. Data is transmitted on the data bus and stored in the latch units. The source driver is powered by a first supply voltage from the power supply. The method comprises determining whether the first supply voltage is insufficient, and if yes, performing the following steps. First, set the data transmitted on the data bus to be a predetermined value. Then, keep the latch units turned on, thereby the data is sent out from the latch units. Then, keep the multiplexer turned on for outputting a driving voltage based on the data via the output pads.

Source driver and method for restraining noise thereof

The present invention discloses a display driver and related display. The display driver includes: a plurality of level shifters, respectively receiving input signals for outputting shifted signals; a plurality of switches; and a digital-to-analog converter, having a plurality of input terminals electrically connected to outputs of the level shifters respectively via the switches directly; wherein the switches are turned off while the level shifters are in a transition to convert the input signals into the shifted signals.

Display driver and related display

An output buffer including a first input stage circuit, a first output stage circuit, a second output stage circuit, a first switching module, and a second switching module is disclosed. The first output stage circuit is coupled to a first data line. The second output stage circuit is coupled to a second data line. The first switching module is coupled between the first input stage circuit and the first output stage circuit. The second switching module is coupled between the first input stage circuit and the second output stage circuit.

Output buffer and source driver utilizing the same

The present invention discloses a source driver and a method for restraining noise output by a source driver during power on/off of a power supply. The source driver includes a multiplexer, at least two channels and at least two output pads. The channels are connected to the output pads via the multiplexer. The source driver is powered by a first supply voltage from the power supply. The two output pads are connected via a charge sharing switch. The method comprises the following steps. First, determine whether the first supply voltage is insufficient, and if yes, perform the following steps. Turn off the charge sharing switch. Then, disconnect the channels from the output pads by the multiplexer.

An interface circuit for data transmission and the method thereof is described. The interface circuit includes a transmitter providing data through first data signals during the data periods corresponding to rising and falling edges of a clock signal, a transition detection unit selectively asserting a detection signal in response to the number of the first data signals having transitions between every two adjacent data periods, a transition reduction unit generating second data signals by outputting the inverted and non-inverted first data signals respectively when the detection signal is asserted and de-asserted, and a receiver restoring the data from the second data signals and the detection signal.

Interface circuit for data transmission and method thereof

The present invention discloses a source driver powered by a power supply comprising at least one channel, at least one output pad coupled to the channel, at least one switch connected between the output pad and a predetermined voltage, and a power down detector for detecting whether a first supply voltage from the power supply is insufficient and generating a reset signal to turn on the switch when the first supply voltage from the power supply is insufficient.

Source driver and power down detector thereof

The level shift circuit and the display using same are disclosed. The level shift circuit includes a shift logic circuit and a logic controller. The shift logic circuit is capable of shifting a level of an input signal. The logic controller is capable of resetting the shift logic circuit before the shift logic circuit shifting the level of the input signal, and then enabling the shift logic circuit to shift the level of the input signal.

Level shift circuit and display using same

An operational amplifier circuit includes a control stage and an output stage. The control stage includes an analog control stage for generating a first control signal according to an input signal and a digital control stage for generating a second control signal according to the input signal. The output stage includes a sourcing circuitry coupled to the analog control stage and a load for sourcing a first current to the load according to the first control signal, and a sinking circuitry coupled to the digital control stage and the load for sinking a second current from the load according to the second control signal.

Operational amplifier circuit having digitally controllable output stage

A source driver and a digital-to-analog converter (DAC) thereof are provided. The DAC converts an input data into an analog voltage. The DAC includes a reference voltage generation unit, a switch unit, and a selection unit. The reference voltage generation unit provides a plurality of voltage levels. The switch unit is coupled to the reference voltage generation unit and determines whether to output the voltage levels, wherein the switch unit is turned off during a data conversion period of the input data. The selection unit is coupled to the reference voltage generation unit via the switch unit, and the selection unit selects one of the voltage levels output by the switch unit according to the input data, wherein the selected voltage level is served as the analog voltage output by the DAC.

Source driver and digital-to-analog converter thereof

The present invention provides a source driver comprising a shift register, a line buffer for storing a data signal and outputting a buffered data signal, and a level shifter for generating a level-shifted data signal based on the buffered data signal. The line buffer further comprises a charge pump supplying a pumped voltage based on a voltage source and a buffer powered by the pumped voltage and outputting a buffered data signal based on the data signal.

Source driver and level shifting method thereof

The present invention discloses a source driver and a level shifting apparatus thereof. The level shifting apparatus is used for shifting a level of a data signal. The level shifting apparatus comprises a first charge pump and a level shifter. The first charge pump supplies a first pumped voltage based on the data signal. The level shifter generates a level-shifted data signal based on the first pumped voltage.

Source driver and level shifting apparatus thereof

The present invention discloses a level shift circuit and a control pulse shaping unit therewith. A level shift circuit for transition of a low-voltage input signal into a high-voltage output signal, the circuit comprising two pairs of transistors and a control unit. Two pairs of transistors, wherein the transistors in one of the pairs are both turned on in response to the input signal so that a voltage on a reference voltage node is coupled to a gate of one of the transistors in the other pair; a control unit decoupling a reference voltage from the reference voltage node during a first phase, and partially and fully coupling the reference voltage to the reference voltage node respectively during a second and third phases.

Level shift circuit

A voltage level shift circuit is provided. The circuit includes an input buffer unit, a level shift unit and a voltage stabilizing capacitor. The input buffer is coupled between a first voltage source and a first ground terminal. The level shift unit is coupled between a second voltage source and a second ground terminal. An input terminal of the level shift unit is coupled to an output terminal of the input buffer unit. The voltage stabilizing capacitor is coupled between the first voltage source and the second ground terminal. When a state transition occurs in the level shift unit, the voltage stabilizing capacitor maintains a voltage difference between the output terminal of the input buffer unit and the second ground terminal.

Voltage level shift circuit

An operational amplifier circuit includes an operational amplifier, a bias current provider, and a control circuitry. The operational amplifier drives a load according to an input signal. The bias current provider is coupled to the operational amplifier and provides a bias current to the operational amplifier. The control circuitry is coupled to the bias current provider and controls the bias current provider to adjust the bias current according to an operating status of the operational amplifier circuit.

Operational amplifier circuit having adjustable bias current

An operational amplifier circuit includes an operational amplifier, an intermediate circuitry, and a control circuitry. The intermediate circuitry is coupled to a load. The operational amplifier is coupled to the intermediate circuitry and drives the load through the intermediate circuitry according to an input signal. The control circuitry is coupled to the intermediate circuitry and controls the intermediate circuitry to adjust an equivalent loading induced by the intermediate circuitry.

Growing community of inventors

Tainan County, Taiwan

Yu-Jui Chang