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Output buffer of source driver

An output buffer, source driver technology, applied in amplifiers, instruments, amplifiers with semiconductor devices/discharge tubes, etc., can solve the voltage slew rate imbalance, NMOS source tracker is not sensitive, affects thin film transistors LCD display visual performance and other issues

Inactive Publication Date: 2012-10-17
RAYDIUM SEMICON
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  • Application Information

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Problems solved by technology

[0007] Depend on image 3 It can be seen that because of the swing level of the input / output signal, the NMOS transistor element MN1 will suffer from a more serious body effect than the PMOS transistor element MP1, resulting in a larger critical voltage, resulting in an NMOS source The pole tracker becomes less sensitive, and the response of the control signal Ctrl_P will be slower than the control signal Ctrl_N, causing the output driving (driving) and sinking (sinking) voltage slew rate to become unbalanced, seriously affecting the thin film transistor LCD Visual Performance

Method used

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Embodiment Construction

[0044] A specific embodiment according to the present invention is an output buffer. In this embodiment, the output buffer is applied in a source driver of a TFT-LCD display device, but not limited thereto.

[0045] In this embodiment, the circuit structure of the source driver of the thin film transistor liquid crystal display device also please refer to figure 1 . Such as figure 1As shown, the source driver 1 includes a receiver (receiver) 10, a data register (data register) 12, a bi-directional shift register (bi-directional shift register) 14, a linear latch (line latch) 16. A level shifter (level shifter) 18 , a digital-to-analog converter (Digital-to-Analog Converter) 20 and an output buffer (output buffer) 22 . Wherein, the receiver 10 is coupled to the data temporary register 12; the data temporary register 12 is coupled to the linear latch 16; the shift register 14 is coupled to the linear latch 16; the linear latch 16 is coupled to to the potential converter 18 ;...

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Abstract

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.

Description

technical field [0001] The present invention relates to a driving circuit, in particular to an output buffer applied in a source driver (source driver) of a liquid crystal display device. Background technique [0002] In recent years, due to continuous innovation and advancement of display technology, various types of display devices, such as liquid crystal displays and plasma displays, have appeared on the market. Since the volume of LCD monitors is much smaller than that of traditional CRT monitors, for modern people with small living spaces, it is indeed more convenient to use LCD monitors that occupy less desktop space. [0003] A driving device for a thin film transistor liquid crystal (TFT-LCD) display mainly includes two parts: a source driver and a gate driver. For thin film transistor liquid crystal displays emphasizing high quality, high resolution and low power consumption, the source driver plays a very important role. Please refer to figure 1 , figure 1 is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G3/36G09G2310/0291G09G3/3674H03F3/45183
Inventor 陈建铭梁彦雄苗蕙雯左克扬
Owner RAYDIUM SEMICON
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