Novatek Microelectronics Corp.

Po-Yu Tseng

Jhih-Siou Cheng

Po-Hsiang Fang

Ju-Lin Huang

Chih-Hsien Chou

Chia-Wei Su

Shun-Hsun Yang

Hsin-Hung Lee

Chieh-An Lin

Yi-Chuan Liu

Chih-Wen Lu

Keko-Chun Liang

Jr-Ching Lin

Pang-Chen Hung

Shang-I Liu

Chun-Yung Cho

Yung-Cheng Lin

Jin-Yi Lin

Ching-Ho Hung

A sensing circuit for an organic light-emitting diode (OLED) driver includes a sample and hold circuit and a clamping circuit. The sample and hold circuit includes a capacitor. The clamping circuit, coupled to the sample and hold circuit, is configured to clamp a sensing voltage received by the sample and hold circuit to conform to a withstand voltage of the capacitor.

Sensing circuit for OLED driver and OLED driver using the same

A chip-on-film package including a flexible substrate, first test pads, second test pads, first connecting wires, second connecting wires and a chip is provided. The flexible substrate includes at least one segment. Each segment has a central portion and a first side portion and a second side portion located at two opposite sides of the central portion. The chip disposed on the central portion includes first connecting pads and second connecting pads. The first test pads and the second test pads are disposed on the first side portion. Two ends of each of the first connecting wires are connected to the corresponding first connecting pad and the corresponding first test pad. Two ends of each of the second connecting wires are connected to the corresponding second connecting pad and the corresponding second test pad. Each of the second connecting wires includes a first section located at the second side portion.

Chip-on-film package

The differential difference amplifier circuit includes a differential input stage circuit, a loading stage circuit coupled to the differential input stage circuit, and an output stage circuit coupled to the loading stage circuit. The output stage circuit is configured to generate an output signal. The differential input stage circuit includes a first differential pair having a first transconductance and a second differential pair having a second transconductance. The first differential pair is biased by a first current source and receives a first input signal and the output signal. The second differential pair is biased by a second current source and receives a second input signal and the output signal. At least one of the first transconductance and the second transconductance is adjusted according to the image data.

Differential difference amplifier circuit having variable transconductance

A source driver including a sensing circuit and an operational amplifier is provided. The sensing circuit senses pixel information of an organic light-emitting diode (OLED) pixel circuit. The operational amplifier includes an amplifier circuit and an offset voltage storing and reducing circuit. An input terminal of the amplifier circuit is coupled to the sensing circuit. The amplifier circuit includes a first gain circuit and a second gain circuit. An output terminal of the offset voltage storing and reducing circuit is coupled to a coupling terminal of the first gain circuit. An input terminal of the offset voltage storing and reducing circuit is coupled to an output terminal of the second gain circuit. The offset voltage storing and reducing circuit stores and reduces an offset voltage of the first gain circuit.

Source driver

An operational amplifier circuit is provided. The operational amplifier circuit includes a differential input stage circuit and a loading stage circuit. The differential input stage circuit includes an input circuit, a voltage maintaining circuit, and a current source. The input circuit includes a first input transistor and a second input transistor, for receiving a first and a second input signals, respectively. The voltage maintaining circuit includes a first branch circuit and a second branch circuit. The first branch circuit is coupled to the first input transistor for receiving the first input signal, and the second branch circuit is coupled to the second input transistor for receiving the second input signal. The current source is coupled to the first input transistor and the second input transistor. The loading stage circuit is coupled to the voltage maintaining circuit.

Operational amplifier circuit capable of improving linearity relation between loading current and input voltage difference

A sensing circuit is provided. The sensing circuit includes a sample and hold circuit and a gain amplifier. The sample and hold circuit includes a first charging path and a second charging path. The first charging path selectively generates a first charging potential between a first sensing terminal and a first reference terminal according to the analog voltage signal and a reference voltage. The second charging path selectively conducts the reference voltage to a second sensing terminal. A pair of differential input signals are generated at the first sensing terminal and the second sensing terminal. The first charging path and the second charging path are implemented by high voltage components. The gain amplifier receives the pair of differential input signals through a first and a second input terminals and generates a pair of differential output signals at a first and a second output terminals.

Sensing circuit of display driver

An operational amplifier circuit is provided. The operational amplifier circuit includes a differential input stage circuit and a loading stage circuit. The differential input stage circuit includes a first current source, a first transistor, a second transistor, a third transistor, and a fourth transistor. The control terminal of the first transistor receives a first input signal. The control terminal of the second transistor receives a second input signal. The third transistor has a first terminal coupled to the second terminal of the first transistor, a second terminal coupled to the first current source, and a control terminal coupled to the control terminal of the second transistor. The fourth transistor has a first terminal coupled to the second terminal of the second transistor, a second terminal coupled to the first current source, and a control terminal coupled to the control terminal of the first transistor.

Operational amplifier circuit using variable bias control

A display apparatus and a driving method of the same are provided. The display apparatus includes a display panel, a gate driver circuit, and a source driver circuit. During a functional sub-period of a frame period, the gate driver circuit simultaneously drives a plurality of gate lines, and the source driver circuit drives a plurality of source lines, so as to perform a function on a plurality of pixels connected to the gate lines. In a scan sub-period of the frame period, the gate driver circuit drives the gate lines according to a scan sequence, and the source driver circuit correspondingly drives the source lines according to the scan sequence of the gate driver circuit in the first scan sub-period, so as to display an image.

Display apparatus and driving method thereof

A display apparatus and a gate driving method thereof are provided. The display apparatus includes a display panel and a gate driver. The display panel has a plurality of gate lines. Output terminals of the gate driver are coupled to the gate lines in a one-to-one manner. The gate driver is configured to drive the gate lines according to a scrambled scan sequence.

Display apparatus and gate driving method thereof

A driving device is provided. The driving device includes a first code mapping circuit, a first source driving channel, a second code mapping circuit and a second source driving channel. The first code mapping circuit converts a first input code in input data into a first intermediate code according to a first code-to-code mapping relation. The first source driving channel converts the first intermediate code into a first analog voltage according to a first code-to-voltage mapping relation. The second code mapping circuit converts a second input code in the input data into a second intennediate code according to a second code-to-code mapping relation which is different from the first code-to-code mapping relation. The second source driving channel converts the second intermediate code into a second analog voltage according to a second code-to-voltage mapping relation which is different from the first code-to-voltage mapping relation.

Driving device

A gate driver, a display apparatus having the same, and a gate driving method are provided. The display apparatus includes a plurality of pixels, a data driver circuit, and a gate driver circuit. The gate driver circuit includes M groups of gate channels. Each of the M groups of gate channels includes a control circuit and an output buffer. The control circuit receives a power supply voltage from a power supply circuit and generates a modulated supply voltage. The output buffer is connected to the control circuit, the output buffer is powered by the modulated supply voltage to output a gate signal to a gate line of the display panel, wherein a driving pulse of the gate signal is shaped during a charge period according to the modulated supply voltage, and the shape of the driving pulse of the gate signal is maintained during a pre-charge period.

Gate driver circuit, display apparatus having the same, and gate driving method

A source driver apparatus and an operating method thereof are provided. The source driver apparatus can drive a plurality of source lines of a display panel, wherein the display panel further comprising a gate driver apparatus. The source driver apparatus includes driving channels and a delay control circuit. The driving channels output source driving signals. The delay control circuit controls the driving channels to change delay times of the source driving signals within the same period, such that the delay times of the source driving signals respectively correspond to distances from the source lines to the gate driver apparatus.

Source driver apparatus having a delay control circuit and operating method thereof

A driving device and a source driving method are provided. The driving device includes a first code mapping unit, a first source driving channel, a second code mapping unit and a second source driving channel. The first code mapping unit converts a first input code in input data into a first intermediate code according to a first code-to-code mapping relation. The first source driving channel converts the first intermediate code into a first analog voltage according to a first code-to-voltage mapping relation. The second code mapping unit converts a second input code in the input data into a second intermediate code according to a second code-to-code mapping relation which is different from the first code-to-code mapping relation. The second source driving channel converts the second intermediate code into a second analog voltage according to a second code-to-voltage mapping relation which is different from the first code-to-voltage mapping relation.

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Taoyuan, Taiwan

Po-Yu Tseng