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Digital-to-analog converting circuit, data driver and display device

A technology of digital-to-analog conversion and data driver, applied in electrical digital data processing, analog/digital conversion, code conversion, etc., can solve problems such as undisclosed decoder structure, and achieve the effect of reducing the area

Active Publication Date: 2013-04-17
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the structure of the decoder that reduces the number of switching elements is not disclosed

Method used

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  • Digital-to-analog converting circuit, data driver and display device
  • Digital-to-analog converting circuit, data driver and display device
  • Digital-to-analog converting circuit, data driver and display device

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Embodiment Construction

[0110] The following description is made with reference to the drawings to further describe the above-mentioned present invention in detail. The DAC as one aspect of the present invention selects the first and second voltages (V) from a reference voltage set (20) composed of a plurality of different reference voltages based on an input digital signal of a predetermined number of bits (m bits). (T1), V(T2)), and output the voltage levels interpolating the first and second voltages above, and group the reference voltages of the reference voltage set (20) into the first to (3S+1) (Where, S is an integer that is a power of 1 or 2: 1, 2, 4,...) Reference voltage group. in figure 1 In one mode of, when represented by index j (j=1, 2,..., h, where h is a predetermined integer), the first reference voltage group 20-1 includes Vr{(3S)×(j-1) +1}, the second reference voltage group 20-2 includes Vr{(3S)×(j-1)+2}, the same below, the (3S+1)th reference voltage group 20-(3S+1) includes Vr...

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Abstract

A m-bit DAC outputs a voltage that is the result of interpolation from two reference voltages. The two reference voltages are selected, inclusive of redundant selection of the same reference voltage (inclusive also of reference voltages other than adjacent voltages) out of a plurality of reference voltages. The plurality of reference voltages are grouped into first to (3S+1)th groups (where S is a power of 2). An ith group includes [3S(j−1)+i]th reference voltages (where j=1, 2, . . . h, and h is a prescribed integer). The decoder includes (3S+1)th subdecoders, each selecting one voltage responsive to a first MSB group; and a (3S+1)-input and 2-output subdecoder for selecting two voltages, inclusive of redundant selection of the same reference voltage, out of (3S+1) voltages selected by the respective first to (3S+1)th subdecoders, responsive to a LSB group and outputs them to an interpolation amplifier (ratio 1:1).

Description

Technical field [0001] The invention relates to a digital-analog conversion circuit and a data driver and a display device using the digital-analog conversion circuit and the data driver. Background technique [0002] In recent years, among the display devices, liquid crystal display devices (LCDs), which are thin, lightweight, and low power consumption, have been widely used, and are more commonly used in mobile phones (mobile-phone, cell-phone), PDA (personal digital assistant), In the display of mobile devices such as notebook PCs. However, recently, the technology of large-screen and dynamic image application of liquid crystal display devices has also been improved. The above-mentioned display devices are not only used for mobile devices, but also can realize stand-alone large-screen display devices and large-screen LCD TVs. As these liquid crystal display devices, an active matrix drive type liquid crystal display device capable of high-definition display is used. [0003] F...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/05H03M1/76G09G3/20G09G3/36
CPCG09G3/3685H03M1/661G09G3/3648H03M1/76
Inventor 土弘
Owner RENESAS ELECTRONICS CORP