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CN101877216A - Liquid crystal dot inversion driving circuit - Google Patents

Liquid crystal dot inversion driving circuit Download PDF

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Publication number
CN101877216A
CN101877216A CN2010101858435A CN201010185843A CN101877216A CN 101877216 A CN101877216 A CN 101877216A CN 2010101858435 A CN2010101858435 A CN 2010101858435A CN 201010185843 A CN201010185843 A CN 201010185843A CN 101877216 A CN101877216 A CN 101877216A
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China
Prior art keywords
signal source
negative
positive
voltage
liquid crystal
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Pending
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CN2010101858435A
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Chinese (zh)
Inventor
洪德儒
林春生
叶政忠
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Sitronix Technology Corp
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Sitronix Technology Corp
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Priority to CN2010101858435A priority Critical patent/CN101877216A/en
Publication of CN101877216A publication Critical patent/CN101877216A/en
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Abstract

A liquid crystal point inversion driving circuit comprises a positive signal source, a first voltage source, a second voltage source and a first voltage source, wherein the positive signal source provides a first positive signal and a second positive signal; the negative signal source provides a first negative signal source and a second negative signal source; the first selection unit is connected with the positive signal source and the negative signal source to receive a first positive signal of the positive signal source and a first negative signal of the negative signal source; the unit is composed of low voltage elements; the second selection unit is connected with the positive signal source and the negative signal source to receive a second positive signal of the positive signal source and a second negative signal of the negative signal source; the unit is composed of low voltage elements; a first signal source connected to the first selection unit to alternately output a first positive voltage and a first negative voltage; and the second signal source is connected with the second selection unit to alternately output a second positive voltage and a second negative voltage. The driving circuit utilizes a single positive signal source and a single negative signal source to form positive voltage and negative voltage outputs of two source electrodes, and the using number of operational amplifiers is reduced.

Description

Liquid crystal point reversing drive circuit
Technical field
The present invention relates to a kind of liquid crystal dots counter-rotating (dot inversion) driving circuit; Particularly relate to a kind of simplification liquid crystal point reversing drive circuit.
Background technology
In general, a plurality of pixels of existing flat-panel screens are to utilize corresponding a plurality of membrane transistor (TFT) (not providing diagram) to control, and show required image so that control a LCD (LCDdisplay).Several gate drive lines of this flat-panel screens are connected to the gate of corresponding membrane transistor, to control the switching manipulation of these membrane transistors.
The polarity of its liquid crystal capacitance gate (gate) and signal source (source) when as shown in Figure 1, two picture frames (frame) among the figure are illustrated respectively in the voltage polarity reversal point counter-rotating that liquid crystal capacitance is recharged.These two picture frames are respectively the first picture frame frame N and the second picture frame frame N+1.For example, this first picture frame frame N and the second picture frame frame N+1 have several liquid crystal capacitance gates G1, G2, G3, G4, G5 and several signal sources S1, S2, S3, S4, S5.
As shown in Figure 2, this synoptic diagram has showed the waveform of liquid crystal dots counter-rotating to the voltage reversal variation of two signal sources.Two signal sources (the first signal source S1, secondary signal source S2) are switched with respect to ground voltage GND (being common electric voltage VCOM) counter-rotating between positive voltage VP and negative voltage VN, make its relative liquid crystal directly produce a counter-rotating.Wherein the voltage waveform of the first signal source S1 is represented with solid line, and the voltage waveform of secondary signal source S2 dots.When the voltage of the first signal source S1 was positioned at positive voltage, S1+ represented with symbol; When it was positioned at negative voltage, S1-represented with symbol.Relative, when the voltage of secondary signal source S2 was positioned at negative voltage, S2-represented with symbol; When it was positioned at positive voltage, S2+ represented with symbol.
As shown in Figure 2, the voltage of the first signal source S1 drops to negative voltage VN by positive voltage VP, and the voltage of secondary signal source S2 rises to positive voltage VP by negative voltage VN.And being promoted to positive voltage VP by negative voltage VN at the voltage of second cycle first signal source S1, the voltage of secondary signal source S2 drops to negative voltage VN by positive voltage VP.By that analogy, the voltage of the first signal source S1 and secondary signal source S2 continues alternately counter-rotating switching in the same manner.
Fig. 3 is the block schematic diagram of available liquid crystal reversing drive circuit; Fig. 4 is the block schematic diagram of another available liquid crystal point reversing drive circuit.As shown in Figure 3, the available liquid crystal point reversing drive circuit need dispose two source class outputs, and is connected to one first signal source S1 and a secondary signal source S2 respectively.Wherein, first signal source connects the first positive signal source PS1, the first negative signal source NS1 and first and selects circuit 10, so that the first signal source S1 can produce positive voltage and negative voltage; Relative, secondary signal source S2 connects the second positive signal source PS2, the second negative signal source NS2 and second and selects circuit 11, so that secondary signal source S2 also can produce positive voltage and negative voltage.
As shown in Figure 3, because the available liquid crystal point reversing drive circuit need dispose the first positive signal source PS1, the first negative signal source NS1, the second positive signal source PS2, the second negative signal source NS2, therefore need to adopt four operational amplifiers altogether.So,, must reduce the volume and the energy consumption of driving circuit if liquid crystal point reversing drive circuit can reduce the quantity of used operational amplifier.
As shown in Figure 3 and Figure 4, first of available liquid crystal point reversing drive circuit selects circuit 10 and second to select circuit 11 to adopt one first high pressure to select circuit 10 ' and one second high pressure to select circuit 11 ' respectively, to avoid producing cross-pressure (cross voltage) problem.In fact, it is to be made of the high pressure manufacturing process element that this first high pressure selects the circuit 10 ' and second high pressure to select circuit 11 ', and therefore the shortcoming that volume is big, energy consumption is high is arranged.So,, must further reduce the volume and the energy consumption of driving circuit if the selection circuit of liquid crystal point reversing drive circuit can be used low pressure processing procedure element instead.
The driving circuit technology of the liquid crystal dots counter-rotating of relevant flat-panel screens has appeared in many patent documentations.For example, TaiWan, China patent disclosure case is No. 200903428, No. 2008488448, No. 2008471168, No. 2008393648, No. 2008282148, No. 2008161268, No. 2008117968, No. 2007367768, No. 2007232328, No. 2007032218, No. 2007032228, No. 200639779, No. 2005339908, No. 2005273628, No. 2005309998, No. 2005291518, No. 2005219318, No. 2005273618, No. 2005140108 and No. 200303003; TaiWan, China patent announcement I293449 number, I292901 number, I291157 number, I291160 number, I284880 number, I284878 number, I269259 number, I269257 number, I253617 number, I240108 number, I224697 number, No. 583630, No. 581909, No. 573291, No. 71283, No. 559753, No. 543018, No. 525127, No. 521241, No. 494383, No. 486687, No. 374861 and No. 350063.Aforementioned each patent documentation is not limited to scope of the present invention only as the reference of the technology of the present invention background and present technical development state is described.
The signal drive system of relevant flat-panel screens also occurs in various countries' patent documentation.For example, U.S. Patent Publication case US20080297458, US20070139327, US20060187164, US20040189575, US20020084960, US20020075212, US20020050972 and US20020024482; U.S. Pat 7,463,232, US 7,450,102, US7,420,533, US7,079,100, US7,079,097, US6,980,186, US6,914,644, US6,891,522, US6,842,161, US6,784,866, US6,724,362, US6,593,905, US6,590,555, US6,566,643, US6,559,822, US6,549,187, US6,512,505, US6,424,328, US6,380,919, US6,320,566, US6,297,793 and US6,064,363; Jap.P. JP2007156382; Korean Patent KR20070051800, KR20040057248, KR20040048523, KR20040019708, KR20050015031, KR20050015030, KR20000007618, KR100242443, KR20030055921, KR20030055892, KR20030029698, KR20020058796, KR20020058141, KR20020052071, KR20020050040, KR20020046601 and KR20020017340.Aforementioned each patent is not limited to scope of the present invention only as the reference of the technology of the present invention background and present technical development state is described.
In view of this, the present invention is in order to satisfy the demand, a kind of liquid crystal point reversing drive circuit is provided, utilize single positive signal source and single negative signal source to form the positive voltage and the negative voltage output of two source electrodes, and adopt low voltage component to constitute and select circuit, promote the electric energy of liquid crystal dots counter-rotating thus and reduce component size, to reach the purpose that reduces driving circuit energy consumption and volume.
Summary of the invention
Fundamental purpose of the present invention provides a kind of liquid crystal point reversing drive circuit, utilize single positive signal source and single negative signal source to form the positive voltage and the negative voltage output of two source electrodes, reduce the usage quantity of operational amplifier, promote the electric energy of liquid crystal dots counter-rotating thus and reduce component size, to reach the purpose that reduces driving circuit energy consumption and volume.
Another object of the present invention provides a kind of liquid crystal point reversing drive circuit, adopt low voltage component to constitute and select circuit, cut down the consumption of energy and reduce volume, promote the electric energy of liquid crystal dots counter-rotating thus and reduce component size, to reach the purpose that reduces driving circuit energy consumption and volume.
The objective of the invention is to be achieved by following technical proposals:
A kind of liquid crystal point reversing drive circuit is characterized in that: comprise
The positive signal source provides first positive signal and second positive signal;
The negative signal source provides the first negative signal source and the second negative signal source;
First selected cell is connected with the negative signal source with described positive signal source, with first positive signal in reception positive signal source and first negative signal in negative signal source; This unit is made of low voltage component;
Second selected cell is connected with the negative signal source with described positive signal source, with second positive signal in reception positive signal source and second negative signal in negative signal source; This unit is made of low voltage component;
First signal source is connected with first selected cell, alternately to export first positive voltage and first negative voltage;
The secondary signal source is connected with second selected cell, alternately to export second positive voltage and second negative voltage;
Wherein, when first signal source was exported first positive voltage, second negative voltage was exported in the secondary signal source, and when first signal source was exported first negative voltage, second positive voltage was exported in the secondary signal source.
Described positive signal source has single operational amplifier.
Described positive signal source links to each other with selecting circuit, and this selection circuit is to be made of low voltage component.
Described negative signal source has single operational amplifier.
Described negative signal source links to each other with selecting circuit, and this selection circuit is to be made of low voltage component.
The invention has the beneficial effects as follows: this liquid crystal point reversing drive circuit, utilize single positive signal source and single negative signal source to form the positive voltage and the negative voltage output of two source electrodes, reduce the usage quantity of operational amplifier, promote the electric energy of liquid crystal dots counter-rotating thus and reduce component size, to reach the purpose that reduces driving circuit energy consumption and volume.And, adopt low voltage component to constitute and select circuit, cut down the consumption of energy and reduce volume, promote the electric energy of liquid crystal dots counter-rotating thus and reduce component size, to reach the purpose that reduces driving circuit energy consumption and volume.
Description of drawings
The polarity synoptic diagram of liquid crystal capacitance gate and signal source when the voltage polarity reversal point that Fig. 1 is recharged at liquid crystal capacitance respectively two picture frames for the counter-rotating of available liquid crystal point reverses.
Fig. 2 is the waveform synoptic diagram of available liquid crystal point counter-rotating to the voltage reversal variation of two signal sources.
Fig. 3 is an available liquid crystal point reversing drive circuit block schematic diagram.
Fig. 4 is the another kind of block schematic diagram of available liquid crystal point reversing drive circuit.
Fig. 5 is the liquid crystal point reversing drive circuit first embodiment block schematic diagram.
Fig. 6 is the liquid crystal point reversing drive circuit second embodiment block schematic diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
The liquid crystal point reversing drive circuit of the flat-panel screens in the desirable embodiment of the present invention can be applicable to various LCD (Liquid Crystal Display, LCD) signal drive system, but and be not used in the range of application that limits liquid crystal point reversing drive circuit among the present invention.
Fig. 5 is the block schematic diagram of liquid crystal point reversing drive circuit first embodiment of the present invention.As shown in the figure, liquid crystal point reversing drive circuit comprises positive signal source 20, negative signal source 21, first selected cell 30, second selected cell 31, the first signal source S1 and secondary signal source S2 in the first embodiment of the invention.
As shown in Figure 5, positive signal source 20 provides two signals, comprises first positive signal (P1 represents with symbol) and second positive signal (P2 represents with symbol); Corresponding, negative signal source 21 also provides two signals, comprises first negative signal (N1 represents with symbol) and second negative signal (N2 represents with symbol).
As shown in Figure 5, first selected cell 30 connects positive signal source 20 and negative signal sources 21, and with the first positive signal P1 that receives positive signal source 20 and the first negative signal N1 in negative signal source 21, and this unit 30 is to be made of low voltage component, to reduce energy consumption and component size.Corresponding, second selected cell 31 connects positive signal source 20 and negative signal sources 21, and with the second positive signal P2 that receives positive signal source 20 and the second negative signal N2 in negative signal source 21, and this unit 31 also is to be made of low voltage component, to reduce energy consumption and component size.
As shown in Figure 5, liquid crystal point reversing drive circuit has two signal outputs, is respectively the first signal source S1 and secondary signal source S2.The first signal source S1 links to each other with first selected cell 30, so that alternately export first positive voltage (signal) and first negative voltage (signal), as shown in Figure 1.Corresponding, secondary signal source S2 links to each other with second selected cell 31, so that alternately export second positive voltage (signal) and second negative voltage (signal), as shown in Figure 1.
As shown in Figure 5, the signal in the signal in positive signal source 20 and negative signal source 21 through first selected cell 30 and second selected cell 31 after, by the some inversion driving signal of the first signal source S1 and secondary signal source S2 output liquid crystal point reversing drive circuit.
As shown in Figure 5, first selected cell 30 has a control module, and this unit controls first selected cell 30 is to determine first signal source S1 output positive signal or negative signal; Corresponding, second selected cell 31 also has a control module, and this unit controls second selected cell 31 is with decision secondary signal source S2 output positive signal or negative signal.
As shown in Figure 5, when the first signal source S1 exported first positive voltage (signal), secondary signal source S2 exported second negative voltage (signal), and when the first signal source S1 exported first negative voltage (signal), secondary signal source S2 exported second positive voltage (signal).
Fig. 6 is the liquid crystal point reversing drive circuit block schematic diagram of second embodiment of the invention, and is consistent corresponding with the circuit among Fig. 5, so the reference with it of the part of similar elements, no longer gives unnecessary details in detail one by one.
As shown in Figure 6, the liquid crystal point reversing drive circuit of second embodiment of the invention comprises that also one first is selected circuit 40 and one second selection circuit 41.First selects circuit 40 to link to each other with positive signal source 20, and this circuit is made of low voltage component; Corresponding, second selects circuit 41 to link to each other with negative signal source 21, and this circuit also is made of low voltage component.
As shown in Figure 6, only there is single operational amplifier in positive signal source 20, and also only there is single operational amplifier in negative signal source 21.Therefore, positive signal source 20 and negative signal source 21 only need dispose two operational amplifiers.
As Fig. 3, Fig. 4 and shown in Figure 6, the available liquid crystal point reversing drive circuit need dispose four operational amplifiers (as shown in Figure 3 and Figure 4); Otherwise the liquid crystal point reversing drive circuit in the first embodiment of the invention only need dispose two operational amplifiers (shown in Fig. 6 left side).Therefore, liquid crystal point reversing drive circuit of the present invention has the effect that reduces element.
Only in order to illustrate the present invention and technical characterictic thereof, the technology of this embodiment still can suitably be carried out various essence equivalence modifications to aforementioned each embodiment and/or substitute mode is implemented; Therefore, protection scope of the present invention should be as the criterion with claims.

Claims (5)

1. a liquid crystal point reversing drive circuit is characterized in that: comprise
The positive signal source provides first positive signal and second positive signal;
The negative signal source provides the first negative signal source and the second negative signal source;
First selected cell is connected with the negative signal source with described positive signal source, with first positive signal in reception positive signal source and first negative signal in negative signal source; This unit is made of low voltage component;
Second selected cell is connected with the negative signal source with described positive signal source, with second positive signal in reception positive signal source and second negative signal in negative signal source; This unit is made of low voltage component;
First signal source is connected with first selected cell, alternately to export first positive voltage and first negative voltage;
The secondary signal source is connected with second selected cell, alternately to export second positive voltage and second negative voltage;
Wherein, when first signal source was exported first positive voltage, second negative voltage was exported in the secondary signal source, and when first signal source was exported first negative voltage, second positive voltage was exported in the secondary signal source.
2. liquid crystal point reversing drive circuit as claimed in claim 1 is characterized in that: described positive signal source has single operational amplifier.
3. liquid crystal point reversing drive circuit as claimed in claim 1 is characterized in that: described positive signal source links to each other with selecting circuit, and this selection circuit is to be made of low voltage component.
4. liquid crystal point reversing drive circuit as claimed in claim 1 is characterized in that: described negative signal source has single operational amplifier.
5. liquid crystal point reversing drive circuit as claimed in claim 1 is characterized in that: described negative signal source links to each other with selecting circuit, and this selection circuit is to be made of low voltage component.
CN2010101858435A 2010-05-28 2010-05-28 Liquid crystal dot inversion driving circuit Pending CN101877216A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103594067A (en) * 2013-11-28 2014-02-19 矽创电子股份有限公司 Display panel drive circuit
CN106548738A (en) * 2015-09-23 2017-03-29 矽创电子股份有限公司 Power supply module in display system, related driving device and power supply method
CN109088631A (en) * 2017-06-14 2018-12-25 原相科技(槟城)有限公司 Mixed signal transmission drive circuit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1504986A (en) * 2002-12-05 2004-06-16 三星电子株式会社 Method and device for driving thin film transistor liquid crystal display
CN1805640A (en) * 2005-01-12 2006-07-19 牛岛昌和 Current-mode resonant inverter circuit
CN1825402A (en) * 2005-02-04 2006-08-30 统宝光电股份有限公司 Signal driving circuit and its electronic device and method for outputting driving voltage
CN1848232A (en) * 2005-04-06 2006-10-18 株式会社瑞萨科技 Semiconductor integrated circuits for driving liquid crystal displays
CN101165754A (en) * 2006-10-17 2008-04-23 松下电器产业株式会社 Driving voltage output circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1504986A (en) * 2002-12-05 2004-06-16 三星电子株式会社 Method and device for driving thin film transistor liquid crystal display
CN1805640A (en) * 2005-01-12 2006-07-19 牛岛昌和 Current-mode resonant inverter circuit
CN1825402A (en) * 2005-02-04 2006-08-30 统宝光电股份有限公司 Signal driving circuit and its electronic device and method for outputting driving voltage
CN1848232A (en) * 2005-04-06 2006-10-18 株式会社瑞萨科技 Semiconductor integrated circuits for driving liquid crystal displays
CN101165754A (en) * 2006-10-17 2008-04-23 松下电器产业株式会社 Driving voltage output circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103594067A (en) * 2013-11-28 2014-02-19 矽创电子股份有限公司 Display panel drive circuit
CN103594067B (en) * 2013-11-28 2016-08-17 矽创电子股份有限公司 Display panel drive circuit
CN106548738A (en) * 2015-09-23 2017-03-29 矽创电子股份有限公司 Power supply module in display system, related driving device and power supply method
US10679570B2 (en) 2015-09-23 2020-06-09 Sitronix Technology Corp. Power supply module of driving device in display system, related driving device and power supply method
CN109088631A (en) * 2017-06-14 2018-12-25 原相科技(槟城)有限公司 Mixed signal transmission drive circuit
CN109088631B (en) * 2017-06-14 2022-02-01 原相科技股份有限公司 Mixed signal emission driving circuit

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Application publication date: 20101103