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Multi-threshold digital/analog converter for thin film transistor LCD driven chip

A digital-to-analog converter, liquid crystal display technology, applied in digital-to-analog converters, static indicators, instruments, etc., to increase the chip area, increase circuit complexity, and reduce the effect of body effects

Inactive Publication Date: 2008-01-09
西安龙腾微电子科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the delay of the existing digital-to-analog converter has become a bottleneck restricting the speed of the digital-to-analog converter. For high-resolution and deep-color TFT-LCD display drivers, the speed of the existing digital-to-analog converter must be increased.

Method used

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  • Multi-threshold digital/analog converter for thin film transistor LCD driven chip
  • Multi-threshold digital/analog converter for thin film transistor LCD driven chip
  • Multi-threshold digital/analog converter for thin film transistor LCD driven chip

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Embodiment Construction

[0017] Referring to Figures 1-3, the present invention sets different substrate voltages V for the CMOS tubes in the digital-to-analog converter. B To reduce the body effect, thereby reducing the on-resistance and time delay of the decoding switch of the CMOS transistor, and improving the operation speed of the digital-to-analog converter.

[0018] Take the 2-threshold N-bit NMOS tube digital-to-analog converter in Figure 1 as an example. For N-bit display data, the resistor network needs to generate 2 N A voltage (V0~V2 N -1), we use V2 N-1 The voltage is bounded, and the source of the NMOS transistor is connected to a voltage greater than or equal to V2 N-1 The substrates of all NMOS transistor switches of the voltage are connected to V2 N-1 , while the source of the NMOS tube is connected to less than V2 N-1 The substrates of all NMOS transistor switches of the voltage are grounded to VSS. In this way, if the decoding channel is above the dotted line, which is the mos...

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Abstract

The invention is concerned with the multi-threshold digital-analog converter (DAC) of the source drive chip of the thin film transistor model liquid crystal display screen, that is: It can reduces the bulk effect by setting up different voltage substrate VB through the CMOS tube of the DAC separately, to reduce the resistance guiding through and time delay of the CMOS tube decoding switch and improve the speed of the DAC. The voltage substrate VB is no more than the voltage of the 3 terminals of the NMOS tube, and is no less than the voltage of the 3 terminals of the PMOS tube to make the substrate of each the NMOS tube or the PMOS tube off-set in reverse direction. Under the condition of non-improving the complexity of the circuit and the area of the chip, it reduces the delay time of the digital-analog converter and improves the speed by reducing the voltage of the substrate of the CMOS tube and the source electrode, and the bulk effect of the CMOS tube.

Description

technical field [0001] The invention relates to a multi-threshold digital-to-analog converter of a thin film transistor type liquid crystal display screen source drive chip. Background technique [0002] 4, the document "Jin-Ho Kim, Byong-Deok Choi, Oh-Kyong Kwon. 1-Billion-Color TFT-LCD TV with Full HD Format. Consumer Electronics, 2005, pp: 1042-1050" discloses a full A digital-to-analog converter using NMOS transistors, wherein the substrates of all NMOS transistors are connected to the power ground VSS. The selected γ voltage can only reach the analog drive buffer through N series-connected NMOS transistors. The on-resistance of the N series-connected CMOS transistors and the equivalent parasitic capacitance C of the output node PAR An equivalent delay circuit is formed, resulting in a decrease in the operation speed of the digital-to-analog converter. Due to the source voltage V of each NMOS transistor S are greater than 0, and the closer the NMOS tube is to the VH t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/66G09G3/36G09G3/20G02F1/133
Inventor 魏廷存吴伟丁行波
Owner 西安龙腾微电子科技发展有限公司
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