Raydium Semiconductor Corporation

Yann-Hsiung Liang

Ko-Yang Tso

Chin-Chieh Chao

Hui-Wen Miao

Chien-Ming Chen

Yu-Lung Lo

Ren-Feng Huang

Chien-Yu Chan

Kuan-Hsien Lee

Keh-La Lin

A micro-LED display system is disclosed. The micro-LED display system includes a host, a plurality of row/column drivers and a plurality of &#x3bc;ICs. The row/column drivers are coupled to the host through serial interfaces and used to provide a plurality of row clock signals and a plurality of column data signals respectively. The &#x3bc;ICs are arranged as a matrix including columns of &#x3bc;ICs and rows of &#x3bc;ICs receiving the column data signals and the row clock signals respectively. All &#x3bc;ICs in the same column of &#x3bc;ICs are cascaded in order and all &#x3bc;ICs in the same row of &#x3bc;ICs are cascaded in order.

Micro-LED display system

An output buffer of a source driver is disclosed. The output buffer includes a buffer input, a buffer output, a differential input stage, a bias current source, an output stage, a compensation capacitor, and a comparator. The output stage and the comparator are both operated between an analog supply voltage (AVDD) and a half analog supply voltage (HAVDD), or both operated between the half analog supply voltage (HAVDD) and a ground voltage. The comparator compares an input signal with an output signal and outputs a control signal to the bias current source according to the compared result.

Output buffer of source driver

An output buffer of a source driver is disclosed. The output buffer includes a buffer input, a buffer output, a differential input stage, a bias current source, an output stage, a compensation capacitor, and a comparator. The output stage and the comparator are both operated between an analog supply voltage (AVDD) and a ground voltage (AGND). The comparator compares an input voltage and an output voltage and outputs a control signal to the bias current source according to the compared result to control a bias current outputted by the bias current source to enhance the slew rate of the output buffer.

A signal circuit includes a clock terminal for transmitting a reference clock and a data terminal for transmitting an input/output data. In an embodiment, the frequency of the reference clock is one-eighth of the bit rate of the input/output data.

Signal circuit

The invention discloses a driving circuit system and a method of elevating a slew rate of an operational amplifier. The driving circuit system comprises an operational amplifier, a judging module and a bias enhancing module. The operational amplifier has an input stage driven by a bias current. The bias enhancing module is electrically connected to the judging module and the input stage of the operational amplifier respectively. The judging module is used to generate a bias enhancing signal according to an edge-trigger of a control signal. When the bias enhancing module receives the bias enhancing signal, the bias enhancing module provides an additional current, which cooperates with the bias current, for driving the input stage of the operational amplifier, so as to elevating a slew rate of the operational amplifier.

Driving circuit system and method of elevating slew rate of operational amplifier

A voltage-clamping device used in an operational amplifier is provided. The operational amplifier comprises a first transistor. The cross-voltage between the gate and the source of the first transistor is near to a specific voltage and the cross-voltage between the drain and the source of the first transistor is not equal to zero, so as to generate a big substrate current. The voltage-clamping device comprises a second transistor whose source and gate are respectively coupled to the drain of the first transistor and used for receiving a bias signal, so that the second transistor is biased in saturation region, and the voltage at the source of the second transistor is made equal to the difference between the bias signal and the threshold voltage of the second transistor. Thus, the cross-voltage between the drain and the source of the first transistor is reduced and the substrate current is reduced accordingly.

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Hsinchu, Taiwan

Yann-Hsiung Liang