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DA converting circuit, display using the same, and mobile terminal having the display

A converter circuit and display unit technology, applied in the direction of digital-to-analog converters, code conversion, static indicators, etc., can solve the problems of reducing the writing characteristics of data lines and difficult to achieve multi-grayscale adaptation

Inactive Publication Date: 2004-01-28
JAPAN DISPLAY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the multi-gradation degrades the writing characteristics to the data line in the D / A converter circuit
For these reasons, in practice, it is difficult to achieve adaptation to multi-gray levels using existing technologies.

Method used

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  • DA converting circuit, display using the same, and mobile terminal having the display
  • DA converting circuit, display using the same, and mobile terminal having the display
  • DA converting circuit, display using the same, and mobile terminal having the display

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Embodiment Construction

[0021] best practice

[0022] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] figure 1 is a circuit diagram showing an exemplary D / A converter circuit according to the first embodiment of the present invention. The reference voltage selection type D / A converter circuit converts 4-bit digital data into analog signals having 16 voltage values ​​used in this embodiment. The reference voltage selection type D / A converter circuit according to the present embodiment includes a reference voltage generation circuit 11 , a selection signal generation circuit 12 and a selection circuit (decoder) 13 .

[0024] The reference voltage generating circuit 11 generates four reference voltages Vref1 to Vref4 suitable for 16 voltage values ​​V1 to V16. Specifically, it generates a reference voltage Vref1 having voltage values ​​V1 to V4, a reference voltage Vref2 having voltage values ​​V5 to V8, a reference voltage Vr...

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Abstract

A D / A converter circuit according to the present invention allows adaptation to multi-gradation by reducing the circuit size. A reference-voltage-selection-type D / A converter circuit that converts 4-bit digital data into an analog signal having 16 voltage values V1 to V16 generates in a reference voltage generating circuit (11) four reference voltages Vref1 to Vref4 having four voltage values in time series and generates a selection signal in a selection signal generating circuit (12) based on low-order two bits of the digital data. A selection circuit (13) selects by time-sharing one of the four voltage values of each of the reference voltages Vref1 to Vref4 based on this selection signal and outputs the analog signal of the selected voltage value to an output line (15).

Description

technical field [0001] The present invention relates to a digital-to-analog converter (hereinafter referred to as a D / A converter) circuit, a display unit using such a D / A converter circuit, and a mobile terminal with such a display unit, in particular to a reference voltage selection type A D / A converter circuit, a display unit using a drive circuit including such a D / A converter circuit, and a mobile terminal having such a display unit as an output display. Background technique [0002] In recent years, mobile terminals such as mobile phones or personal digital assistants (PDAs) have become increasingly popular. One of the factors contributing to the rapid popularity of these mobile terminals is the display unit included therein as an output display. Such display units include liquid crystal display units used as output displays, which use liquid crystal cells as pixel optoelectronic devices. The liquid crystal display unit does not require any driving electric power in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G09G3/20G09G3/30G09G3/36H03M1/66H03M1/68H03M1/76
CPCH03M1/765H03M1/68H03M1/687G09G3/2081G09G2310/027G09G3/3688G09G3/2018G09G3/2011G09G3/30H03M1/76
Inventor 本田芳利仲岛义晴前川敏一
Owner JAPAN DISPLAY INC