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Digital-analog converter, circuit board, electronic device, and liquid crystal display unit

A digital-to-analog converter, digital signal conversion technology, applied in the direction of digital-to-analog converter, analog-to-digital conversion, electrical components, etc., can solve problems such as high power consumption, and achieve the effect of reducing power consumption

Inactive Publication Date: 2004-06-30
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since the current flowing always flows through the resistors connected in series, the power dissipation is large

Method used

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  • Digital-analog converter, circuit board, electronic device, and liquid crystal display unit
  • Digital-analog converter, circuit board, electronic device, and liquid crystal display unit
  • Digital-analog converter, circuit board, electronic device, and liquid crystal display unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] FIG. 1 shows a driving circuit of a liquid crystal display device according to a first embodiment. In addition, FIG. 2 shows an exploded perspective view of the liquid crystal display device. As shown in FIG. 2, this liquid crystal display device has a liquid crystal panel 40 of an active matrix type. The liquid crystal panel 40 is formed by sealing a liquid crystal 46 between a TFT substrate 43 having a thin film transistor 42 each controlling a power supply of a potential of a pixel electrode and a color filter substrate 45 having a counter electrode 44. In addition, deflection plates 47 and 48 are installed on both surfaces of the liquid crystal panel 40 , and a backlight 49 is installed on one side of the deflection plate 48 . Furthermore, a driver circuit 50 is formed on the TFT substrate 43 .

[0096] As shown in FIG. 1 , the driving circuit 50 includes a digital-to-analog conversion circuit 100 according to the present invention. The digital-to-analog conversi...

Embodiment 2

[0150] FIG. 5 is a circuit diagram showing a digital-to-analog conversion circuit according to a second embodiment. The digital-to-analog conversion circuit 200 is formed by adding a potential discriminating block 210 and precharge switches TC1 and TC2 to the digital-to-analog conversion circuit 100 .

[0151] The pre-charge switch TC1 is between the high potential line 102 and the output line 106 , and the pre-charge switch TC2 is between the output line 106 and the low potential line 104 .

[0152] If the pre-charge switch TC1 is on and the pre-charge switch TC2 is off, the analog output signal V of the output line 106 Sbecomes the potential V of the high potential line 102 H same potential. Therefore, if the analog output signal V corresponding to the digital signal S close to the potential V H , then in this way the analog output signal V S set to the potential V H . Then, it is possible to obtain an appropriate analog output signal V by using variable resistor bloc...

Embodiment 3

[0165] FIG. 6 is a circuit diagram showing a digital-to-analog conversion circuit according to a third embodiment. The digital-to-analog conversion circuit 300 is formed by adding a potential adjustment block 310 to the digital-to-analog conversion circuit 100 .

[0166] The potential adjustment block 310 controls the respective potentials V of the high potential line 102 and the low potential line 104 H and V L The change. Therefore, the analog output signal V S range can be changed.

[0167] For example, in the first embodiment, the potential V H set to 8V, V L is set to 0V, therefore, the analog output signal V S Varies from 0 to 7V. If the potential V H becomes 16V, V L becomes 8V, therefore, the analog output signal V S becomes variable in the range of 8 to 15V. Then, without changing the structure of the variable resistance block R1 and R2, it is possible to obtain the analog output signal V in the range of 0 to 16V S .

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Abstract

A digital-analog converter that converts plural bits of a digital signal into an analog output, comprises high-potential wiring to which a high potential VH is supplied, low-potential wiring to which a low potential VL is supplied, output wiring for obtaining the analog output VS, a first variable resistance block R1 that is provided between the high-potential wiring and the output wiring, and a second variable resistance block R2 that is provided between the output wiring and the low-potential wiring. A ratio of resistance values of the first and second variable resistance blocks R1 and R2 is represented by a ratio of non-negative integers which are natural numbers, whose total sum is equal to a constant, and that change in increments of one based on the digital signals D0 to D2 increasing or decreasing by a minimum unit.

Description

technical field [0001] The invention relates to a digital-to-analog converter, a circuit board, an electronic device and a liquid crystal display device. Background technique [0002] A well-known digital-to-analog converter is a voltage-dividing circuit that consists of series-connected resistors and obtains an analog output signal in accordance with a digital signal. For example, use the search formula ((D / A+digitalanalog+(digital*analog))*(C+converter))+(drive*circuit)*resistor*(serial+parallel)*(potential+voltage)*liquid crystal to investigate When using PATIOS of the Japan Patent Information Organization, 98 items were retrieved. Specifically, Japanese Unexamined Patent Publication No. 5-181436 was found by connecting resistors in series. [0003] According to a conventional DAC like this, since the voltage dividing circuit is constituted by resistors connected in series, for example, as shown in FIG. 11, it is necessary to provide not only a plurality of resistors bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/133G09G3/36H03M1/06H03M1/66H03M1/80
CPCG09G2310/027G09G3/3688H03M1/0619G09G2330/021G09G2320/0276H03M1/808H03M1/66
Inventor 木村睦
Owner SEIKO EPSON CORP
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