CN1294450C - Tandem LCD driver circuit - Google Patents
Tandem LCD driver circuit Download PDFInfo
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- CN1294450C CN1294450C CNB2003101034416A CN200310103441A CN1294450C CN 1294450 C CN1294450 C CN 1294450C CN B2003101034416 A CNB2003101034416 A CN B2003101034416A CN 200310103441 A CN200310103441 A CN 200310103441A CN 1294450 C CN1294450 C CN 1294450C
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 29
- 230000007704 transition Effects 0.000 claims description 6
- 230000008054 signal transmission Effects 0.000 claims description 4
- 230000003321 amplification Effects 0.000 description 21
- 238000003199 nucleic acid amplification method Methods 0.000 description 21
- 238000005516 engineering process Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 230000008520 organization Effects 0.000 description 4
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- 239000000758 substrate Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000002834 transmittance Methods 0.000 description 1
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Abstract
The invention relates to a tandem type liquid crystal display driving circuit, which comprises a plurality of driving circuit units, a plurality of differential signal sending circuits and a plurality of differential signal receiving circuits. The driving circuit units are respectively provided with the differential signal sending circuit to generate differential signals and transmit the differential signals to the next stage of the driving circuit units. In addition, the driving circuit units are respectively provided with the differential signal receiving circuit to receive the differential signal output by the previous stage of the driving circuit unit. The disadvantage of excessive power consumption can be improved by using differential signal.
Description
Technical field
The present invention relates to a kind of driving circuit of LCD, particularly relate to a kind of liquid crystal display drive circuit of concatenation type.
Background technology
At present existing known liquid crystal display drive circuit is divided into block form driving circuit and concatenation type driving circuit.Because the block form driving circuit is to adopt the mode of bus-bar to transmit the drive circuit unit of data signal (being data-signal) to appointment, has therefore caused the block form driving circuit because of the cloth spare and the required board area that expends that winds the line.
Seeing also shown in Figure 1ly, is the Organization Chart of existing known block form driving circuit.LCD 110 required data signals 122 are supplied with by several drive circuit units 120 among the figure, and those drive circuit units 120 are that (Tape Carrier Package, TCP) technology applies it with encapsulation on the film.Drive circuit unit 120 is supplied with required source book signal 144 by data bus 142, and source book signal 144 then is sent to the drive circuit unit 120 of appointment via data bus 142 by time schedule controller 140.Above-mentioned data bus 142 and time schedule controller 140 all are to apply on printed circuit board (PCB) 130.Required because of bus-bar framework and sequential control thereof, cause need expending circuit board 130 areas in a large number because of cloth spare and coiling.Pursue at electronic product now under the trend of reduced volume, develop then and the concatenation type driving circuit.
This concatenation type driving circuit is that several drive circuit units are formed by connecting in the serial connection mode.This kind circuit reaches data signal the drive circuit unit of appointment with transfer mode step by step.
Seeing also shown in Figure 2ly, is the Organization Chart of concatenation type driving circuit.In the drawings, LCD 210 required data signals 222 are supplied with by several drive circuit units 220, and drive circuit unit 220 is that (Chip On Glass, COG) technology applies on liquid crystal display substrate 210 with encapsulation on the slide.Time schedule controller 240 applies on printed circuit board (PCB) 230, and this time schedule controller 240 produces serial connection signal 224, and is passed to a certain appointment driver element 220 step by step by the serial connection framework of drive circuit unit 220.The transmission channels of serial connection signal 224 is that (Wire On Array, WOA) technology applies on liquid crystal display substrate 210 with array routing.
Seeing also shown in Figure 3ly, is the signal attenuation variation diagram that obtains another serial connection signal 330 after serial connection signal 310 transmits by WOA lead 320.
Because the concatenation type driving circuit is to apply on the substrate of LCD, online between each drive circuit unit is to apply it with the WOA technology, therefore greatly it is inevitably sorry in impedance, and then has and cause signal attenuation and the excessive shortcoming of consumed power.
This shows that above-mentioned existing concatenation type liquid crystal display drive circuit still has many defectives, and demands urgently further being improved.In order to solve the problem that the concatenation type liquid crystal display drive circuit exists, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.
Because the defective that above-mentioned existing concatenation type liquid crystal display drive circuit exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, actively studied innovation, in the hope of founding a kind of novel concatenation type liquid crystal display drive circuit, can improve existing concatenation type liquid crystal display drive circuit, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective that existing concatenation type liquid crystal display drive circuit exists, and provide a kind of new concatenation type liquid crystal display drive circuit, technical matters to be solved is to make it can improve the existing known excessive shortcoming of concatenation type driving circuit consumed power, thereby be suitable for practicality more, and have the value on the industry.
Another object of the present invention is to, a kind of new concatenation type liquid crystal display drive circuit is provided, technical matters to be solved is to make it can improve the shortcoming that has known concatenation type driving circuit signal attenuation now.
A further object of the present invention is, a kind of new concatenation type liquid crystal display drive circuit is provided, technical matters to be solved is to make it be provided with the differential wave interface circuit, can be applicable between each unit of concatenation type driving circuit, and can improve the excessive shortcoming of consumed power, thereby be suitable for practicality more.
An also purpose of the present invention is that a kind of new concatenation type liquid crystal display drive circuit is provided, and technical matters to be solved is to make it be provided with signal amplification circuit, and can solve the shortcoming of signal attenuation, thereby is suitable for practicality more.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of concatenation type liquid crystal display drive circuit that the present invention proposes, this circuit comprises: a plurality of drive circuit units, and those drive circuit units connect in the serial connection mode, are for exporting a data signal to drive LCD; A plurality of differential wave transtation mission circuits respectively dispose one of those differential wave transtation mission circuits in those drive circuit units, be the next stage that produces differential wave and be passed to this drive circuit unit; And a plurality of differential signal receiver circuits, in those drive circuit units, respectively dispose one of those differential signal receiver circuits, be to receive the differential wave that the previous stage of this drive circuit unit is exported.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid concatenation type liquid crystal display drive circuit, wherein said differential wave transtation mission circuit more comprises: a current source provides the differential wave transmitter required electric current; And four transistor, be respectively a first transistor, one transistor seconds, one the 3rd transistor and one the 4th transistor, wherein, the drain electrode of this first transistor and this transistor seconds is connected to this current source, the source electrode of this first transistor is connected to the 3rd transistor drain and draws to connect and is output as one first signal, the source electrode of this transistor seconds is connected to the 4th transistor drain and draws to connect and is output as a secondary signal, the 3rd transistor AND gate the 4th transistorized source ground, the two formed signal of this first signal and this secondary signal is this differential wave.
Aforesaid concatenation type liquid crystal display drive circuit, wherein said differential wave transtation mission circuit more comprises a signal amplification circuit, this signal amplification circuit is made part with this differential wave and is amplified before this differential wave transtation mission circuit sends differential wave after the signal transition.
Aforesaid concatenation type liquid crystal display drive circuit, it more comprises wherein said signal amplification circuit: two current sources are respectively one first current source and one second current source; Two resistance are respectively one first resistance and one second resistance, and second end of those resistance is ground connection respectively; And four sense control switches, be respectively one first sense control switch, one second sense control switch, one the 3rd sense control switch and one the 4th sense control switch, first end of this first sense control switch and this second sense control switch is connected to this first current source, first end of the 3rd sense control switch and the 4th sense control switch is connected to this second current source, second end of this first sense control switch and the 3rd sense control switch all is connected to first end of this first resistance and draws to connect and is output as one first signal, second end of this second sense control switch and the 4th sense control switch all is connected to first end of this second resistance and draws to connect and is output as a secondary signal, this first signal cooperates this differential wave after this secondary signal is amplification, wherein, when if desire is amplified signal, be about to this first sense control switch and the 3rd sense control switch short circuit and this second sense control switch and the 4th sense control switch are opened circuit, then open circuit when not amplifying with this first sense control switch and the 4th sense control switch short circuit and with this second sense control switch and the 3rd sense control switch.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, in order to reach aforementioned goal of the invention, major technique of the present invention thes contents are as follows:
The present invention proposes a concatenation type liquid crystal display drive circuit, comprises a plurality of drive circuit units, a plurality of differential wave transtation mission circuit and a plurality of differential signal receiver circuit.Those drive circuit units connect in the serial connection mode, and export a data signal to drive LCD.Respectively dispose this differential wave transtation mission circuit in those drive circuit units, to produce differential wave and to be passed to the next stage of this drive circuit unit.In those drive circuit units, respectively dispose in addition this differential signal receiver circuit, the differential wave of being exported with the previous stage that receives this drive circuit unit.Mat uses differential wave and can improve the excessive shortcoming of consumed power.
In a preferred embodiment of the present invention, aforesaid differential wave transtation mission circuit more comprises a signal amplification circuit, and this signal amplification circuit is made part with this differential wave and amplified before this differential wave transtation mission circuit sends differential wave after the signal transition.
By above-mentioned technical scheme, the present invention is because use differential wave interface circuit (being interface circuit) between each drive circuit unit, this differential wave interface circuit is to place a differential wave transtation mission circuit in time schedule controller, and places a differential signal receiver circuit and a differential wave transtation mission circuit in each drive circuit unit.Because differential wave is to transmit message with a positive voltage signal and anti-phase negative voltage signal gained voltage difference thereof, therefore existingly known utilize change in voltage and transmit the mode of message, more can reach the purpose that reduces power consumption by decreased voltage.
Shown in another preferred embodiment of the present invention, because the utilization signal amplification circuit is at the differential wave transtation mission circuit of each drive circuit unit and time schedule controller, the part signal of differential wave after its transition of former desire output imposed amplification, and can compensate its signal attenuation in transmission course in advance.
In sum, the concatenation type liquid crystal display drive circuit of special construction of the present invention can improve the existing known excessive shortcoming of concatenation type driving circuit consumed power, and can improve the shortcoming that has known concatenation type driving circuit signal attenuation now; And it is provided with the differential wave interface circuit, can be applicable between each unit of concatenation type driving circuit, and can improve the excessive shortcoming of consumed power; It also is provided with signal amplification circuit in addition, can solve the shortcoming of signal attenuation, thereby be suitable for practicality more, and have the value on the industry.The present invention has above-mentioned plurality of advantages and practical value, and in like product, do not see have similar structural design to publish or use and really genus innovation, no matter it structurally or bigger improvement all arranged on the function, have large improvement technically, and produced handy and practical effect, and more existing concatenation type liquid crystal display drive circuit has the multinomial effect of enhancement, thereby be suitable for practicality more, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
Description of drawings
Fig. 1 is the Organization Chart of the block form driving circuit that adopts of prior art.
Fig. 2 is the Organization Chart of the string type driving circuit that adopts of prior art.
Signal attenuation when Fig. 3 is the signal transmission changes oscillogram.
Fig. 4 is the calcspar according to drive circuit unit in a preferred embodiment of the present invention.
Fig. 5 implements example figure according to one of differential wave interface circuit in a preferred embodiment of the present invention.
Fig. 6 be according to the present invention in another preferred embodiment drive circuit unit contain the calcspar of signal amplification circuit.
Fig. 7 is the oscillogram that signal amplifies in another preferred embodiment according to the present invention
Fig. 8 one of signal amplification circuit implements example figure according to the present invention in another preferred embodiment.
110,210: LCD 120,220: drive circuit unit
122,222: the data signal 130,230 that drives LCD: printed circuit board (PCB)
140,240: time schedule controller 142: data bus (bus)
144: source book signal 224: serial connection signal (general signal)
310: the original waveform before signal transmits
320: the signal transmission channels of utilizing array (being array) wiring (WOA) technology to make
330: the signal attenuation waveform 410,610 after the transmission: drive circuit unit
412,414,612,614: differential wave 420: differential signal receiver circuit
430,501,630: differential wave transtation mission circuit 502,620: differential signal receiver circuit
510,810,820: current source 520,530,540,550: transistor
522,532,832,834: signal 560: differential amplifier
570,870,880: resistor 640,710: signal amplification circuit
720: the original signal waveform 730 before signal amplifies: the signal waveform after amplify the part
830,840,850,860: sense control switch
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of concatenation type liquid crystal display drive circuit, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
Seeing also shown in Figure 4ly, is the calcspar according to the drive circuit unit of a preferred embodiment of the present invention, the arbitrary drive circuit unit in the figure shows according to a preferred embodiment of the present invention.Differential wave 412 is sent and is arrived the corresponding levels by previous stage, read in drive circuit unit 410 via differential signal receiver circuit 420, and differential wave transtation mission circuit 430 produces differential wave 414 and is sent to next stage subsequently.
Mentioned differential wave transtation mission circuit 430 and receiving circuit 420 in the previous embodiment can be implemented it as shown in Figure 5.See also shown in Figure 5, the drain electrode of transistor 520 and transistor 530 is connected to current source 510, the source electrode of transistor 520 is connected to the drain electrode of transistor 540 and draws to connect and is output as signal 522, the source electrode of transistor 530 is connected to the drain electrode of transistor 550 and draws to connect and is output as signal 532, the source ground of transistor 540 and transistor 550.Signal 522 cooperates signal 532 to be the differential wave of differential wave transtation mission circuit 501 desires output.And differential signal receiver circuit 502 is connected to the 1st end of resistor 570 and the negative input end of differential amplifier 560 with signal 522, and signal 532 is connected to the 2nd end of resistor 570 and the positive input terminal of differential amplifier 560.
Other, illustrates as shown in Figure 6 especially exemplified by another preferred embodiment according to the present invention at this in the possible problem of signal attenuation of transmittance process (as shown in Figure 3) at traditional differential wave.See also shown in Figure 6. be the arbitrary drive circuit unit in according to a preferred embodiment of the present invention.Differential wave 612 is sent and is arrived the corresponding levels by previous stage, read in drive circuit unit 610 via differential signal receiver circuit 620, differential wave transtation mission circuit 630 produces differential wave subsequently, this differential wave imposes amplification through the part signal of signal amplification circuit 640 after the signal transition, gets a differential wave 614 and is sent to next stage.
Seeing also shown in Figure 7ly, is that the explanation signal is through the wave form varies figure of amplifying circuit.Differential wave 720 is behind the signal amplification circuit 710 of a preferred embodiment of the present invention among the figure, a differential wave 730 after amplifying.
The mentioned signal amplification circuit of aforesaid second embodiment can be implemented it as Fig. 8.See also shown in Figure 8ly, current source 810 and current source 820 among the figure are supplied with the required electric current of signal amplification circuit respectively.Second end of resistance 870 and resistance 880 is ground connection respectively.First end of sense control switch 830 and sense control switch 840 is connected to current source 810, first end of sense control switch 850 and sense control switch 860 is connected to current source 820, second end of sense control switch 830 and sense control switch 850 all is connected to first end of resistance 870 and draws to connect and is output as signal 834, and second end of sense control switch 840 and sense control switch 860 all is connected to first end of resistance 880 and draws to connect and is output as signal 832.Signal 834 cooperates signal 832 to be the differential wave of this signal amplification circuit institute desire output.Wherein, if when the signal front end of desire after with the original signal transition done local the amplification, need sense control switch 830 and sense control switch 850 short circuits (on) and will feel control switch 840 and feel and control switch 860 open circuit (off); Need sense control switch 830 and sense control switch 860 short circuits (on) during non local amplification and will feel control switch 840 and feel and control switch 850 open circuit (off).
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101034416A CN1294450C (en) | 2003-11-03 | 2003-11-03 | Tandem LCD driver circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101034416A CN1294450C (en) | 2003-11-03 | 2003-11-03 | Tandem LCD driver circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1540423A CN1540423A (en) | 2004-10-27 |
| CN1294450C true CN1294450C (en) | 2007-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101034416A Expired - Fee Related CN1294450C (en) | 2003-11-03 | 2003-11-03 | Tandem LCD driver circuit |
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| CN (1) | CN1294450C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0631269B1 (en) * | 1993-05-10 | 1999-04-21 | Kabushiki Kaisha Toshiba | Liquid crystal driving power supply circuit |
| CN1293764A (en) * | 1999-01-08 | 2001-05-02 | 精工爱普生株式会社 | Liquid crystal driving power supply device and liquid crystal device and electronic instrument using the same |
-
2003
- 2003-11-03 CN CNB2003101034416A patent/CN1294450C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0631269B1 (en) * | 1993-05-10 | 1999-04-21 | Kabushiki Kaisha Toshiba | Liquid crystal driving power supply circuit |
| CN1293764A (en) * | 1999-01-08 | 2001-05-02 | 精工爱普生株式会社 | Liquid crystal driving power supply device and liquid crystal device and electronic instrument using the same |
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| Publication number | Publication date |
|---|---|
| CN1540423A (en) | 2004-10-27 |
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