CN102654970B - Grating drive circuit and 3D (three-dimensional) display - Google Patents
Grating drive circuit and 3D (three-dimensional) display Download PDFInfo
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- CN102654970B CN102654970B CN201210141026.9A CN201210141026A CN102654970B CN 102654970 B CN102654970 B CN 102654970B CN 201210141026 A CN201210141026 A CN 201210141026A CN 102654970 B CN102654970 B CN 102654970B
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Abstract
The invention is applicable to the field of 3D (three-dimensional) display, and provides a grating drive circuit and a 3D display; and the grating drive circuit comprises a polarity inversion circuit and a difference amplifying circuit. The grating drive circuit provided by the invention converts the polarity of an external square signal by the polarity inversion circuit and then outputs a first square signal PWM+(pulse-width modulation) and a second square signal PWM-, which have the completely opposite polarities; the difference amplifying circuit carries out difference amplification on the first square signal and the second square signal to output difference wave form COM and SEG signals with the same voltage and the opposite polarity to drive the grating; the square wave duty ratio of the drive grating is 50%, so that the service life of the grating can be prolonged; the structure of the grating drive circuit can be optimized, and the design cost of hardware can be reduced; and the frequency can be automatically adjusted, and the 3D display effect can be improved.
Description
Technical field
The invention belongs to 3D and show field, particularly relate to a kind of grating driving circuit and 3D display.
Background technology
Existing grating driving circuit mainly uses 555 devices as clock oscillation circuit, produces a square-wave signal.Because the discharge and recharge time of 555 devices to electric capacity is unequal, the square-wave cycle exported is certain, but dutycycle is not 50%, so in the driving circuit, individual counter has been added after 555 devices, frequency division is carried out to square wave, finally obtains that a dutycycle is 50%, frequency is 38 ~ 45Hz, amplitude is the square wave of 12V.Produce generating positive and negative voltage by the polarity of charging and discharging conversion of an electric capacity C again, finally obtain the drive waveforms needed.
But there is following problems in existing grating driving circuit: (1) export duty cycle square wave can not entirely accurate reach 50%; (2) frequency adjustment can not regulate automatically; (3) complex circuit designs, cost is high.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of grating driving circuit, be intended to solve duty cycle square wave that existing grating driving circuit exports can not entirely accurate reach 50%, and the problem that existing grating driving circuit is complicated, cost is high.
The embodiment of the present invention is achieved in that a kind of grating driving circuit, comprising: polarity transformation circuits, exports a pair polarity antipodal first square-wave signal PWM+ and the second square-wave signal PWM-after the square-wave signal of outside is carried out reversal; Differential amplifier circuit, its input end is connected to the output terminal of described polarity transformation circuits, and the output terminal of described differential amplifier circuit connects grating; Described first square-wave signal and described second square-wave signal are carried out differential amplification by described differential amplifier circuit, identical, the opposite polarity difference waveform COM of output voltage and SEG signal for driving described grating; Described polarity transformation circuits comprises: the 3rd triode, the 5th triode, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 8th resistance, the 9th resistance, the 17 resistance and the 14 resistance; Described 3rd resistance and described 9th resistance are sequentially connected in series between power supply and ground, and described 3rd resistance is connected outside square-wave signal with the end that is connected in series of described 9th resistance; What the base stage of described 3rd triode was connected to the 3rd resistance and the 9th resistance by the 8th resistance is connected in series end; The collector of described 3rd triode is connected to power supply by the 4th resistance, and the collector of described 3rd triode also exports the first square-wave signal PWM+ by the 5th resistance R5, the grounded emitter of described 3rd triode Q3; What the base stage of described 5th triode was connected to the 3rd resistance and the 9th resistance by the 17 resistance is connected in series end; The collector of described 5th triode is connected to power supply by the 14 resistance, and the collector of described 5th triode also exports the second square-wave signal PWM-by described 6th resistance, the grounded emitter of described 5th triode.
Further, described grating driving circuit also comprises the constant current source feedback circuit be connected with described differential amplifier circuit.
Further, described constant current source feedback circuit comprises: the 4th triode, the tenth resistance, the 12 resistance, the 13 resistance, the 15 resistance and the 16 resistance; Described 12 resistance and described 15 resistance are sequentially connected in series between power supply and ground; What the base stage of described 4th triode was connected to the 12 resistance and the 15 resistance by described 13 resistance is connected in series end, and the collector of described 4th triode is connected with described differential amplifier circuit by described tenth resistance; The emitter of described 4th triode is by described 16 resistance eutral grounding.
Further, described differential amplifier circuit comprises: the first triode, the second triode, the first resistance, the second resistance and electric capacity; The base stage of described first triode is connected to the described first square-wave signal PWM+ of described polarity transformation circuits output, and the collector of described first triode is connected to power supply by the first resistance; The base stage of described second triode is connected to the described second square-wave signal PWM-of described polarity transformation circuits output, and the collector of described second triode is connected to power supply by the second resistance; Be connected with described constant current source feedback circuit again after the emitter of described first triode is connected with the emitter of described second triode; One end of described electric capacity is connected to the collector of described first triode, and the other end is connected to the collector of described second triode.
Further, described differential amplifier circuit comprises: the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 18 resistance, the 19 resistance, the 20 resistance and the 21 resistance; The grid of described first metal-oxide-semiconductor is connected to the described first square-wave signal PWM+ of described polarity transformation circuits output by described 20 resistance, the drain electrode of described first metal-oxide-semiconductor is connected to power supply by described 18 resistance; The grid of described second metal-oxide-semiconductor is connected to the described second square-wave signal PWM-of described polarity transformation circuits output by the 21 resistance, the drain electrode of described second metal-oxide-semiconductor is connected to power supply by the 19 resistance; Be connected with described constant current source feedback circuit again after the source electrode of described first metal-oxide-semiconductor is connected with the source electrode of described second metal-oxide-semiconductor.
Further, the square-wave signal of described outside is produced by the GPIO mouth of MCU or RAM.
The object of the embodiment of the present invention is also to provide a kind of 3D display comprising above-mentioned grating driving circuit.
In embodiments of the present invention, grating driving circuit exports a pair polarity antipodal first square-wave signal PWM+ and the second square-wave signal PWM-after adopting polarity transformation circuits that the square-wave signal of outside is carried out reversal; First square-wave signal and described second square-wave signal are carried out differential amplification by differential amplifier circuit, identical, the opposite polarity difference waveform COM of output voltage and SEG signal for driving grating; Real realization drives the duty cycle square wave of grating to be 50%, extends grating serviceable life; Optimize the structure of grating driving circuit, reduce cost of hardware design; Frequency can also be realized automatically regulate, improve 3D display effect.
Accompanying drawing explanation
Fig. 1 is the modular structure principle schematic of the grating driving circuit that the embodiment of the present invention provides;
Fig. 2 is the physical circuit figure of the grating driving circuit that the embodiment of the present invention provides;
Fig. 3 is the physical circuit figure of differential amplifier circuit in the grating driving circuit that provides of another embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The grating driving circuit that the embodiment of the present invention provides is mainly used in 3D display, all needs to use grating driving circuit in bore hole 3D or 3D glasses; Along with the development of 3D technology, its cost also decreases, and the optimization of various piece also certainly will be expert at, and for the grating driving circuit of low-cost and high-performance, also will become the key of system optimization.
Fig. 1 shows the modular structure principle of the grating driving circuit that the embodiment of the present invention provides; For convenience of explanation, illustrate only the part relevant to the embodiment of the present invention, details are as follows:
Grating driving circuit 1 comprises: polarity transformation circuits 11 and differential amplifier circuit 12, and wherein, polarity transformation circuits 11 exports a pair polarity antipodal first square-wave signal PWM+ and the second square-wave signal PWM-after the square-wave signal of outside is carried out reversal; The input end of differential amplifier circuit 12 is connected to the output terminal of polarity transformation circuits 11, and the output terminal of differential amplifier circuit 12 connects grating 2; First square-wave signal PWM+ and the second square-wave signal PWM-is carried out differential amplification by differential amplifier circuit 12, identical, the opposite polarity difference waveform COM of output voltage and SEG signal for driving grating 2.
In embodiments of the present invention, grating driving circuit 1 also comprises the constant current source feedback circuit 13 be connected with differential amplifier circuit 12.Because the change of temperature, VCC change in voltage and input voltage can not too high reasons, thus need to adopt differential amplifier circuit 12 and electric 13 tunnels of constant current source feedback, but be (being less than+12V) under low Power Supplies Condition, obtain being tending towards infinitely-great feedback resistance, thus adopt constant current source feedback circuit.Wherein, outside square-wave signal is produced by the GPIO mouth of MCU or RAM.And the square-wave signal of the described square-wave signal that the GPIO mouth of MCU or RAM produces to be frequency be 30-120HZ.Because 3D grating inside is specific liquid crystal molecule, so have specific requirement to the drive waveforms provided, for preventing liquid crystal molecule characteristic damaged, the square-wave signal of generating positive and negative voltage cyclical movement must be met, dutycycle is 50%, ripple frequency is driven to be between 30 ~ 120Hz, and adjustable, amplitude is 24V(-12 ~+12V).
The grating driving circuit 1 pair of 3D grating 2 adopting the embodiment of the present invention to provide drives, and can simplify circuit hardware Design and optimization circuit structure, reduce costs; In addition according to the performance need of grating 2, grating driving circuit 1 can provide dutycycle be 50% square wave; Frequency can also be realized automatically regulate, improve 3D display effect.
Fig. 2 shows the physical circuit of the grating driving circuit 1 that first embodiment of the invention provides; Wherein, polarity transformation circuits 11 comprises: the 3rd triode Q3, the 5th triode Q5, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 8th resistance R8, the 9th resistance R9, the 17 resistance R17, the 14 resistance R14; 3rd resistance R3 and the 9th resistance R9 is sequentially connected in series between power supply+12V and ground, and the 3rd resistance R3 is connected outside square-wave signal with the end that is connected in series of the 9th resistance R9; What the base stage of the 3rd triode Q3 was connected to the 3rd resistance R3 and the 9th resistance R9 by the 8th resistance R8 is connected in series end; The collector of the 3rd triode Q3 is connected to power supply+12V by the 4th resistance R4, also exports the first square-wave signal PWM+ by the 5th resistance R5, the grounded emitter of the 3rd triode Q3; What the base stage of the 5th triode Q5 was connected to the 3rd resistance R3 and the 9th resistance R9 by the 17 resistance R17 is connected in series end; The collector of the 5th triode Q5 is connected to power supply+12V by the 14 resistance R14, also exports the second square-wave signal PWM-by the 6th resistance R6, the grounded emitter of the 5th triode Q5.
Differential amplifier circuit 12 comprises: the first triode Q1, the second triode Q2, the first resistance R1, the second resistance R2 and electric capacity C1; Wherein the base stage of the first triode Q1 is connected to the first square-wave signal PWM+ that polarity transformation circuits 11 exports, and the collector of the first triode Q1 is connected to power supply+12V by resistance R1; The base stage of the second triode Q2 is connected to the second square-wave signal PWM-of polarity transformation circuits 11 output, and the collector of the second triode Q2 is connected to power supply+12V by the second resistance R2; Be connected with constant current source feedback circuit 13 again after the emitter of the first triode Q1 is connected with the emitter of the second triode Q2; One end of electric capacity C1 is connected to the collector of the first triode Q1, and the other end of electric capacity C1 is connected to the collector of the second triode Q2.Wherein, for improving the performance of differential amplifier circuit 12, increasing C1 electric capacity thus improving circuit common mode interference.
Constant current source feedback circuit 13 comprises: the 4th triode Q4, the tenth resistance R10, the 12 resistance R12, the 13 resistance R13, the 15 resistance R15 and the 16 resistance R16; Wherein, the 12 resistance R12 and the 15 resistance R15 is sequentially connected in series between power supply+12V and ground; The base stage of the 4th triode Q4 is connected to the end that is connected in series of the 12 resistance R12 and the 15 resistance R15 by the 13 resistance R13, the collector of the 4th triode Q4 is connected with differential amplifier circuit 12 by the tenth resistance R10; The emitter of the 4th triode Q4 is by the 16 resistance R16 ground connection.
In order to the grating driving circuit 1 that the further description embodiment of the present invention provides, the principle of work that existing composition graphs 2 describes grating driving circuit 1 in detail is as follows:
Grating driving circuit 1 is by square wave polarity transformation circuits 11, differential amplifier circuit 12, constant current source feedback circuit 13 forms, the square-wave signal of 30-120HZ is produced by the GPIO mouth of MCU or system master chip CPU, the 3rd triode Q3 in polarity transformation circuits 11, 5th triode Q5, a pair polarity antipodal first square-wave signal PWM+ and the second square-wave signal PWM-is produced at its collector, receive the first triode Q1 respectively, differential amplifier circuit 12 base input end that second triode Q2 forms, after differential amplification, at the first triode Q1, it is identical that second triode Q2 current collection point produces voltage, opposite polarity difference waveform COM and SEG signal go to control grating 2.Wherein, electric capacity C1 is for eliminating common mode interference; And the 4th triode Q4, the tenth resistance R10, the 12 resistance R12, the 13 resistance R13, the 15 resistance R15 and the 16 resistance R16 form constant-current source circuit thus improve zero of circuit and to waft rejection ability.
In embodiments of the present invention, grating 2 is equivalent to a jumbo load, need have very strong load capacity for grating driving circuit 1, when needs drive large scale grating, need the first triode Q1, the second triode Q2 be changed into metal-oxide-semiconductor, to make waveform be out of shape less when driving grating.As shown in Figure 3: differential amplifier circuit 12 comprises: the first metal-oxide-semiconductor T1, the second metal-oxide-semiconductor T2, the 18 resistance Rd1, the 19 resistance Rd2, the 20 resistance Rg1 and the 21 resistance Rg2; Wherein the grid of the first metal-oxide-semiconductor T1 is connected to the first square-wave signal PWM+ of polarity transformation circuits 11 output by the 20 resistance Rg1, and the drain electrode of the first metal-oxide-semiconductor T1 is connected to power vd D by the 18 resistance Rd1; The grid of the second metal-oxide-semiconductor T2 is connected to the second square-wave signal PWM-of polarity transformation circuits 11 output by the 21 resistance Rg2, the drain electrode of the second metal-oxide-semiconductor T2 is connected to power vd D by the 19 resistance Rd2; Be connected with constant current source feedback circuit 13 again after the source electrode of the first metal-oxide-semiconductor T1 is connected with the source electrode of the second metal-oxide-semiconductor T2.
In embodiments of the present invention, grating driving circuit 1 exports a pair polarity antipodal first square-wave signal PWM+ and the second square-wave signal PWM-after adopting polarity transformation circuits that the square-wave signal of outside is carried out reversal; First square-wave signal and described second square-wave signal are carried out differential amplification by differential amplifier circuit 2, identical, the opposite polarity difference waveform COM of output voltage and SEG signal for driving grating; Real realization drives the duty cycle square wave of grating to be 50%, extends grating serviceable life; Optimize the structure of grating driving circuit, reduce cost of hardware design; Frequency can also be realized automatically regulate, improve 3D display effect.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a grating driving circuit, is characterized in that, comprising:
Polarity transformation circuits, exports a pair polarity antipodal first square-wave signal PWM+ and the second square-wave signal PWM-after the square-wave signal of outside is carried out reversal;
Differential amplifier circuit, its input end is connected to the output terminal of described polarity transformation circuits, and the output terminal of described differential amplifier circuit connects grating; Described first square-wave signal and described second square-wave signal are carried out differential amplification by described differential amplifier circuit, identical, the opposite polarity difference waveform COM of output voltage and SEG signal for driving described grating;
Described polarity transformation circuits comprises: the 3rd triode, the 5th triode, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 8th resistance, the 9th resistance, the 17 resistance and the 14 resistance;
Described 3rd resistance and described 9th resistance are sequentially connected in series between power supply and ground, and described 3rd resistance is connected outside square-wave signal with the end that is connected in series of described 9th resistance;
What the base stage of described 3rd triode was connected to the 3rd resistance and the 9th resistance by the 8th resistance is connected in series end; The collector of described 3rd triode is connected to power supply by the 4th resistance, and the collector of described 3rd triode also exports the first square-wave signal PWM+ by the 5th resistance, the grounded emitter of described 3rd triode;
What the base stage of described 5th triode was connected to the 3rd resistance and the 9th resistance by the 17 resistance is connected in series end; The collector of described 5th triode is connected to power supply by the 14 resistance, and the collector of described 5th triode also exports the second square-wave signal PWM-by described 6th resistance, the grounded emitter of described 5th triode.
2. grating driving circuit as claimed in claim 1, it is characterized in that, described grating driving circuit also comprises the constant current source feedback circuit be connected with described differential amplifier circuit.
3. grating driving circuit as claimed in claim 2, it is characterized in that, described constant current source feedback circuit comprises:
4th triode, the tenth resistance, the 12 resistance, the 13 resistance, the 15 resistance and the 16 resistance;
Described 12 resistance and described 15 resistance are sequentially connected in series between power supply and ground;
What the base stage of described 4th triode was connected to the 12 resistance and the 15 resistance by described 13 resistance is connected in series end, and the collector of described 4th triode is connected with described differential amplifier circuit by described tenth resistance; The emitter of described 4th triode is by described 16 resistance eutral grounding.
4. grating driving circuit as claimed in claim 2, it is characterized in that, described differential amplifier circuit comprises:
First triode, the second triode, the first resistance, the second resistance and electric capacity;
The base stage of described first triode is connected to the described first square-wave signal PWM+ of described polarity transformation circuits output, and the collector of described first triode is connected to power supply by the first resistance;
The base stage of described second triode is connected to the described second square-wave signal PWM-of described polarity transformation circuits output, and the collector of described second triode is connected to power supply by the second resistance;
Be connected with described constant current source feedback circuit again after the emitter of described first triode is connected with the emitter of described second triode;
One end of described electric capacity is connected to the collector of described first triode, and the other end is connected to the collector of described second triode.
5. grating driving circuit as claimed in claim 2, it is characterized in that, described differential amplifier circuit comprises: the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 18 resistance, the 19 resistance, the 20 resistance and the 21 resistance;
The grid of described first metal-oxide-semiconductor is connected to the described first square-wave signal PWM+ of described polarity transformation circuits output by described 20 resistance, the drain electrode of described first metal-oxide-semiconductor is connected to power supply by described 18 resistance;
The grid of described second metal-oxide-semiconductor is connected to the described second square-wave signal PWM-of described polarity transformation circuits output by the 21 resistance, the drain electrode of described second metal-oxide-semiconductor is connected to power supply by the 19 resistance;
Be connected with described constant current source feedback circuit again after the source electrode of described first metal-oxide-semiconductor is connected with the source electrode of described second metal-oxide-semiconductor.
6. grating driving circuit as claimed in claim 1, it is characterized in that, the square-wave signal of described outside is produced by the GPIO mouth of MCU or RAM.
7. one kind comprises the 3D display of the grating driving circuit described in any one of claim 1-6.
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| CN201210141026.9A CN102654970B (en) | 2012-05-09 | 2012-05-09 | Grating drive circuit and 3D (three-dimensional) display |
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| CN201210141026.9A CN102654970B (en) | 2012-05-09 | 2012-05-09 | Grating drive circuit and 3D (three-dimensional) display |
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| CN102654970B true CN102654970B (en) | 2014-12-31 |
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| CN109633953B (en) * | 2019-02-15 | 2021-11-12 | 天马微电子股份有限公司 | Liquid crystal grating driving circuit, light valve and display device |
| CN114236869B (en) * | 2022-01-21 | 2024-01-30 | 合肥京东方光电科技有限公司 | Display grating driving circuit, method and host equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7106318B1 (en) * | 2000-04-28 | 2006-09-12 | Jps Group Holdings, Ltd. | Low power LCD driving scheme employing two or more power supplies |
| KR100648796B1 (en) * | 2004-09-09 | 2006-11-23 | 매그나칩 반도체 유한회사 | Drvier circuit of display device with high definition |
| KR100786862B1 (en) * | 2004-11-30 | 2007-12-20 | 삼성에스디아이 주식회사 | Barrier device, three dimensional image display using the same and method thereof |
| JP2007264185A (en) * | 2006-03-28 | 2007-10-11 | ▲しい▼創電子股▲ふん▼有限公司 | Driving method for increasing gray scale |
| KR101015846B1 (en) * | 2009-01-16 | 2011-02-23 | 삼성모바일디스플레이주식회사 | Electronic display device |
| KR101752640B1 (en) * | 2009-03-27 | 2017-06-30 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | Semiconductor device |
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