CN101996606A - Liquid crystal driving circuit and liquid crystal display device - Google Patents
Liquid crystal driving circuit and liquid crystal display device Download PDFInfo
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- CN101996606A CN101996606A CN 201010567231 CN201010567231A CN101996606A CN 101996606 A CN101996606 A CN 101996606A CN 201010567231 CN201010567231 CN 201010567231 CN 201010567231 A CN201010567231 A CN 201010567231A CN 101996606 A CN101996606 A CN 101996606A
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- operational amplifier
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Abstract
The invention relates to a driving circuit and a display device, in particular to a liquid crystal driving circuit and a liquid crystal display device. The invention aims to provide a novel liquid crystal driving circuit and a novel liquid crystal display device. The liquid crystal driving circuit comprises two selectors, four digital potentiometers and two operational amplifiers, wherein voltage difference required by a liquid crystal pixel unit is generated by antiphase amplifying circuit combination consisting of the selectors, the digital potentiometers and the operational amplifiers; and different liquid crystal driving voltages are obtained by controlling the output of each selector and digital potentiometer. A technical scheme comprises two antiphase amplifying circuit modules, wherein the first antiphase amplifying circuit module comprises a selector 1, a digital potentiometer 3, a digital potentiometer 4 and an operational amplifier 7; and the second antiphase amplifying circuit module comprises a selector 2, a digital potentiometer 5, a digital potentiometer 6 and an operational amplifier 8. The liquid crystal driving circuit and the liquid crystal display device are applied to the occasions where the liquid crystal driving circuit and the liquid crystal display device are used.
Description
Technical field
The present invention relates to a kind of driving circuit and display device, particularly relate to a kind of liquid crystal display drive circuit and liquid crystal indicator.
Background technology
Liquid crystal display is by adding that in each liquid crystal pixel cells two lateral electrode different voltage official post Liquid Crystal Molecules Alignment states changes, thereby obtains different display effects.Because development of semiconductor can combine large scale integrated circuit and liquid crystal display device easily, adopt the different liquid crystal drive voltage of integrated circuit output poor, realize individual drive to each pixel.
At present, TFT (Thin Film Transistor) LCD commonly used is exactly this integrated LCD of semiconductor devices, adopts thin film transistor (TFT) to drive liquid crystal display pixel.The principal feature of TFT LCD be for each pixel arrangement the semiconductor switch device that constitutes of thin film transistor (TFT), each pixel can directly be controlled by a pulse.Such method for designing can accurately be controlled display gray scale, improves to show contrast.
Summary of the invention
The purpose of this invention is to provide a kind of novel liquid crystal display drive circuit and liquid crystal indicator, this liquid crystal display drive circuit comprises two selector switchs, four digital regulation resistances and two operational amplifiers.The required voltage difference of liquid crystal pixel cells work is provided with generation by the see-saw circuit combination that selector switch, digital regulation resistance and operational amplifier constitute, and by controlling the output of each selector switch and digital regulation resistance, obtains different liquid crystal drive voltages.
For achieving the above object, the technical solution used in the present invention is:
A kind of liquid crystal display drive circuit and liquid crystal indicator, comprise two-way see-saw circuit module, the first see-saw circuit module comprises first selector 1, first digital regulation resistance 3, second digital regulation resistance 4, first operational amplifier 7, first selector 1, first digital regulation resistance 3, first operational amplifier, 7 negative input ends are electrically connected in proper order, second digital regulation resistance, 4 input ends are electrically connected with first operational amplifier, 7 negative input ends, and second digital regulation resistance, 4 output terminals are electrically connected with first operational amplifier, 7 output terminals; The second see-saw circuit module comprises second selector 2, the 3rd digital regulation resistance 5, the 4th digital regulation resistance 6, second operational amplifier 8, second selector 2, the 3rd digital regulation resistance 5, second operational amplifier, 8 negative input ends are electrically connected in proper order, the 4th digital regulation resistance 6 input ends are electrically connected with second operational amplifier, 8 negative input ends, and the 4th digital regulation resistance 6 output terminals are electrically connected with second operational amplifier, 8 output terminals.
Described see-saw circuit module input voltage one and voltage two are electrically connected with first selector 1 input end, second selector 2 input ends simultaneously; First selector 1 output terminal is electrically connected with first digital regulation resistance, 3 input ends, first digital regulation resistance, 3 output terminals are electrically connected with first operational amplifier, 7 negative input ends, second digital regulation resistance, 4 input ends respectively, second digital regulation resistance, 4 output terminals are electrically connected with first operational amplifier, 7 output terminals, and as the output of liquid crystal pixel cells electrode one; Second selector output terminal 2 links to each other with the 3rd digital regulation resistance 5 input ends, the 3rd digital regulation resistance 5 output terminals link to each other with the 4th digital regulation resistance 6 input ends with second operational amplifier, 8 negative input ends simultaneously, the 4th digital regulation resistance 6 output terminals link to each other with second operational amplifier output terminal 8, and as the output of liquid crystal pixel cells electrode two
From the architectural feature of the invention described above as can be seen, its advantage is: control the output of each selector switch and digital regulation resistance, obtain different liquid crystal drive voltages, thereby accurately control display gray scale, improve and show contrast.
Description of drawings
The present invention will illustrate by way of compared with accompanying drawings and combined with example:
Fig. 1 is a structural representation of the present invention
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In the embodiment shown in fig. 1, a kind of liquid crystal display drive circuit and liquid crystal indicator, comprise two-way see-saw circuit module, the first see-saw circuit module comprises first selector 1, first digital regulation resistance 3, second digital regulation resistance 4, first operational amplifier 7, first selector 1, first digital regulation resistance 3, first operational amplifier, 7 negative input ends are electrically connected in proper order, second digital regulation resistance, 4 input ends are electrically connected with first operational amplifier, 7 negative input ends, and second digital regulation resistance, 4 output terminals are electrically connected with first operational amplifier, 7 output terminals; The second see-saw circuit module comprises second selector 2, the 3rd digital regulation resistance 5, the 4th digital regulation resistance 6, second operational amplifier 8, second selector 2, the 3rd digital regulation resistance 5, second operational amplifier, 8 negative input ends are electrically connected in proper order, the 4th digital regulation resistance 6 input ends are electrically connected with second operational amplifier, 8 negative input ends, and the 4th digital regulation resistance 6 output terminals are electrically connected with second operational amplifier, 8 output terminals.
See-saw circuit module input voltage one and voltage two are electrically connected with first selector 1 input end, second selector 2 input ends simultaneously; First selector 1 output terminal is electrically connected with first digital regulation resistance, 3 input ends, first digital regulation resistance, 3 output terminals are electrically connected with first operational amplifier, 7 negative input ends, second digital regulation resistance, 4 input ends respectively, second digital regulation resistance, 4 output terminals are electrically connected with first operational amplifier, 7 output terminals, and as the output of liquid crystal pixel cells electrode one; Second selector output terminal 2 links to each other with the 3rd digital regulation resistance 5 input ends, the 3rd digital regulation resistance 5 output terminals link to each other with the 4th digital regulation resistance 6 input ends with second operational amplifier, 8 negative input ends simultaneously, the 4th digital regulation resistance 6 output terminals link to each other with second operational amplifier output terminal 8, and as the output of liquid crystal pixel cells electrode two.
The required voltage of liquid crystal pixel cells work is obtained by the LC driving electrode one at liquid crystal pixel cells two ends and the voltage difference of electrode two.At first by first selector 1 voltage V1 or V2 are switched to formation input voltage Va in the circuit, wherein V1 and V2 are the maximal value and the minimum value of liquid crystal drive voltage; Input voltage Va input constitutes see-saw circuit by first digital regulation resistance 3, second digital regulation resistance 4 and first operational amplifier 7, regulate through digital first digital regulation resistance 3, second digital regulation resistance 4, output terminal in see-saw circuit produces output voltage V out1, computing formula is: Vout1=-Va*R2/R1, as a same reason, second selector 2 switches to formation input voltage Vb in the circuit with voltage V1 or V2; Input voltage Vb input constitutes see-saw circuit by the 3rd digital regulation resistance 5, the 4th digital regulation resistance 6 and second operational amplifier 8, regulate through the 3rd digital regulation resistance 5, the 4th digital regulation resistance 6, at the output terminal generation output voltage V out2=-Vb*R4/R3 of see-saw circuit.By controlling each selector switch and digital regulation resistance, obtain different liquid crystal drive voltages at the liquid crystal pixel cells two ends poor, thereby accurately control display gray scale, improves to show contrast.
Disclosed all features in this instructions except mutually exclusive feature, all can make up by any way.
Disclosed arbitrary feature in this instructions (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
Claims (2)
1. liquid crystal display drive circuit and liquid crystal indicator, it is characterized in that comprising two-way see-saw circuit module, the first see-saw circuit module comprises first selector (1), first digital regulation resistance (3), second digital regulation resistance (4), first operational amplifier (7), first selector (1), first digital regulation resistance (3), first operational amplifier (7) negative input end is electrically connected in proper order, second digital regulation resistance (4) input end is electrically connected with first operational amplifier (7) negative input end, and second digital regulation resistance (4) output terminal is electrically connected with first operational amplifier (7) output terminal; The second see-saw circuit module comprises second selector (2), the 3rd digital regulation resistance (5), the 4th digital regulation resistance (6), second operational amplifier (8), second selector (2), the 3rd digital regulation resistance (5), second operational amplifier (8) negative input end are electrically connected in proper order, the 4th digital regulation resistance (6) input end is electrically connected with second operational amplifier (8) negative input end, and the 4th digital regulation resistance (6) output terminal is electrically connected with second operational amplifier (8) output terminal.
2. a kind of liquid crystal display drive circuit according to claim 1 and liquid crystal indicator is characterized in that described see-saw circuit module input voltage one and voltage two are electrically connected with first selector (1) input end, second selector (2) input end simultaneously; First selector (1) output terminal is electrically connected with first digital regulation resistance (3) input end, first digital regulation resistance (3) output terminal is electrically connected with first operational amplifier (7) negative input end, second digital regulation resistance (4) input end respectively, second digital regulation resistance (4) output terminal is electrically connected with first operational amplifier (7) output terminal, and as the output of liquid crystal pixel cells electrode one; Second selector output terminal (2) links to each other with the 3rd digital regulation resistance (5) input end, the 3rd digital regulation resistance (5) output terminal links to each other with the 4th digital regulation resistance (6) input end with second operational amplifier (8) negative input end simultaneously, the 4th digital regulation resistance (6) output terminal links to each other with second operational amplifier output terminal (8), and as the output of liquid crystal pixel cells electrode two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010567231 CN101996606A (en) | 2010-11-30 | 2010-11-30 | Liquid crystal driving circuit and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010567231 CN101996606A (en) | 2010-11-30 | 2010-11-30 | Liquid crystal driving circuit and liquid crystal display device |
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| Publication Number | Publication Date |
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| CN101996606A true CN101996606A (en) | 2011-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 201010567231 Pending CN101996606A (en) | 2010-11-30 | 2010-11-30 | Liquid crystal driving circuit and liquid crystal display device |
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| CN (1) | CN101996606A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021179313A1 (en) * | 2020-03-13 | 2021-09-16 | 好易写（深圳）科技有限公司 | Liquid crystal writing film circuit structure, liquid crystal writing film, and liquid crystal writing tablet thereof |
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| CN1897077A (en) * | 2005-07-11 | 2007-01-17 | 三星电子株式会社 | Voltage generator for flat panel display |
| CN101271677A (en) * | 2007-03-19 | 2008-09-24 | 联詠科技股份有限公司 | Analog type source pole driving apparatus |
| CN101286306A (en) * | 2007-04-10 | 2008-10-15 | 株式会社日立显示器 | Liquid crystal display device |
| CN101345018A (en) * | 2007-07-09 | 2009-01-14 | 恩益禧电子股份有限公司 | Data driver for display device, test method and probe card for data driver |
| CN101364794A (en) * | 2007-08-08 | 2009-02-11 | 恩益禧电子股份有限公司 | Amplifying circuit and display unit |
| CN101540585A (en) * | 2008-03-21 | 2009-09-23 | 珠海全志科技有限公司 | Amplifier |
| CN201910227U (en) * | 2010-11-30 | 2011-07-27 | 中国工程物理研究院流体物理研究所 | Liquid crystal drive circuit used for liquid crystal display device |
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2010
- 2010-11-30 CN CN 201010567231 patent/CN101996606A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1897077A (en) * | 2005-07-11 | 2007-01-17 | 三星电子株式会社 | Voltage generator for flat panel display |
| CN101271677A (en) * | 2007-03-19 | 2008-09-24 | 联詠科技股份有限公司 | Analog type source pole driving apparatus |
| CN101286306A (en) * | 2007-04-10 | 2008-10-15 | 株式会社日立显示器 | Liquid crystal display device |
| CN101345018A (en) * | 2007-07-09 | 2009-01-14 | 恩益禧电子股份有限公司 | Data driver for display device, test method and probe card for data driver |
| CN101364794A (en) * | 2007-08-08 | 2009-02-11 | 恩益禧电子股份有限公司 | Amplifying circuit and display unit |
| CN101540585A (en) * | 2008-03-21 | 2009-09-23 | 珠海全志科技有限公司 | Amplifier |
| CN201910227U (en) * | 2010-11-30 | 2011-07-27 | 中国工程物理研究院流体物理研究所 | Liquid crystal drive circuit used for liquid crystal display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021179313A1 (en) * | 2020-03-13 | 2021-09-16 | 好易写（深圳）科技有限公司 | Liquid crystal writing film circuit structure, liquid crystal writing film, and liquid crystal writing tablet thereof |
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Application publication date: 20110330 |