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Digital-to-analog converter

A digital-to-analog and digital signal conversion technology applied to DAC. field, it can solve the problem of expanding the size of the DAC chip and achieve the effect of reducing the number of components

Inactive Publication Date: 2010-11-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the current situation that liquid crystal displays are developing towards high-definition and multi-gray scale, the above-mentioned prior art has to expand the chip size of the DAC

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Abstract

An object of the present invention is to reduce the number of elements of a DAC while keeping the same resolution. For example, in order to convert a 6-bit digital signal into an analog signal, a reference voltage generating circuit 100 for generating 17 reference voltages, a first switch circuit 200 having 19 switch pairs each including a MOS transistor for two reference voltages adjacent to each other in accordance with upper four bits, a second switch circuit 300 including a series circuit of 12 MOS transistors and for dividing the difference between the two selected reference voltages using combined ON-resistances into four so as to obtain three intermediate voltages, and a third switch circuit 400 for selectively outputting the lower voltage of the two selected reference voltages or one of the three intermediate voltages in accordance with lower two bits, are provided.

Description

Digital to Analog Converter technical field The present invention relates to a digital-to-analog converter (DAC), in particular to a DAC suitable for image display devices such as liquid crystal displays. Background technique As one of the DACs used in conventional liquid crystal displays, a currently known DAC has: a reference voltage generating circuit, a selection circuit having a plurality of switch pairs, and a voltage follower. Specifically, when the DAC receives a 6-bit digital signal as an input code, the reference voltage generation circuit is composed of 32 resistor elements connected in series, and 33 reference voltages different from each other of the resistor elements are supplied to the selection circuit. The selection circuit is composed of 37 switch pairs. The 37 switch pairs select one of the two inputs according to the corresponding bits of each input code. If the input code is an odd number, two of the 33 reference voltages that are adjacent to each othe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/66G09G3/36G09G3/20G02F1/133
CPCH03M1/76
Inventor 中山久留美土居康之
Owner PANASONIC CORP