CN206194350U - Zero stand -by power consumption does not have MCU IO simulation LCD drive circuit of remaining bias voltage of direct current - Google Patents
Zero stand -by power consumption does not have MCU IO simulation LCD drive circuit of remaining bias voltage of direct current Download PDFInfo
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- CN206194350U CN206194350U CN201621173952.4U CN201621173952U CN206194350U CN 206194350 U CN206194350 U CN 206194350U CN 201621173952 U CN201621173952 U CN 201621173952U CN 206194350 U CN206194350 U CN 206194350U
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- 239000011521 glass Substances 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 4
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Abstract
The utility model discloses a zero stand -by power consumption does not have MCU IO simulation LCD drive circuit of remaining bias voltage of direct current, it includes: MCU and peripheral circuit, MCU has a plurality of IO feet, and per two IO feet connect and connect the COM signal end that a LCD shows behind the voltage combiner circuit, and the voltage of this COM signal end is half the for two IO foot voltage sums connecting with it. The utility model discloses the voltage mean value of well COM signal end does not receive the influence of driving resistance resistance error, can not cause LCD's electrode ageing phenomenon, can prolong LCD's life. In addition, because the voltage of COM signal end all is synthetic by two MCU's IO foot output voltage, when two MCU's IO foot voltage all be 0V, synthetic voltage is 0V, and COM signal terminal voltage is 0V promptly, at this moment, the COM signal hold and two MCU's IO foot between the voltage combiner circuit in two driving resistance does not all have the electric current within a definite time and flow past to zero -power when realizing the LCD standby, and can reach the zero -bias.
Description
Technical field：
The utility model is related to LCD drive circuit technical fields, refers in particular to a kind of zero stand-by power consumption without the remaining bias of direct current
MCU IO simulate LCD drive circuits.
Background technology：
LCD (abbreviation of Liquid Crystal Display) liquid crystal display.The construction of LCD is in the parallel glass of two panels
Liquid crystal cell is placed in the middle of glass substrate, TFT (thin film transistor (TFT)) is set on lower baseplate glass, colorized optical filtering is set on upper substrate glass
Piece, changes to control the rotation direction of liquid crystal molecule by the signal on TFT and voltage, controls each pixel inclined so as to reach
Light outgoing of shaking whether and reach display purpose.
LCD must be driven when working by special LCD drive circuits, and special LCD drive circuit high costs, and should
Drive circuit can also consume electric current after LCD is turned off, and infringement LCD shows advantage low in energy consumption.In addition, LCD needs COM and SEG
Between driving voltage average value be 0V, otherwise influence the life-span of LCD, general analog drive circuit can be influenceed by resistance error
And it is not 0V to make driving voltage average value, therefore the service life of LCD can be shortened.
In view of this, the present inventor proposes following technical scheme.
Utility model content：
The purpose of this utility model is to overcome the deficiencies in the prior art, there is provided a kind of zero stand-by power consumption is remaining partially without direct current
The MCU IO simulation LCD drive circuits of pressure.
In order to solve the above-mentioned technical problem, the utility model employs following technical proposals：Zero stand-by power consumption is without direct current
The MCU IO simulation LCD drive circuits of remnants biass include：MCU and peripheral circuit, the MCU have some IO pin, and often
Two IO pin connect the COM signal ends that a LCD shows after connecting a voltage combiner circuit, and the voltage of the COM signal ends is for therewith
Two half of IO pin voltage sums of connection.
Furthermore, in above-mentioned technical proposal, the voltage combiner circuit includes be connected with two IO pin respectively two
Individual driving resistance, the other end of two driving resistance is all connected with same COM signal ends, and two resistance phases of driving resistance
Deng.
Furthermore, in above-mentioned technical proposal, the quantity of the IO pin is three, including first, second, third IO
Pin；The quantity of the COM signal ends is three, including a COM signal ends, the 2nd COM signal ends, the 3rd COM signal ends；Institute
The quantity for stating voltage combiner circuit is three.
Furthermore, in above-mentioned technical proposal, an IO pin and the 2nd IO pin connect first voltage synthesis electricity
A COM signal ends are connected behind road, an IO pin and the 3rd IO pin connect second after connecting second voltage combiner circuit
COM signal ends, the 2nd IO pin and the 3rd IO pin connect the 3rd COM signal ends after connecting the 3rd voltage combiner circuit.
After adopting the above technical scheme, the utility model has the advantages that compared with prior art：This practicality
The average voltage of new middle COM signal ends is not driven the influence of resistance error, and the ageing of electrode for not resulting in LCD shows
As the service life of LCD can be extended.Further, since the voltage of COM signal ends is closed by two IO pin output voltages of MCU
Into when two IO pin voltages of MCU are all 0V, resultant voltage is 0V, i.e., COM signal end voltages are 0V, at this moment, COM signals
No current flows through between two driving resistance in voltage combiner circuit between end and two IO pin of MCU, so as to realize that LCD is treated
Zero-power during machine, and can reach zero-bias.
Brief description of the drawings：
Fig. 1 is circuit diagram of the present utility model；
Fig. 2 is utility model works principle oscillogram.
Specific embodiment：
The utility model is further illustrated with reference to specific embodiments and the drawings.
As shown in Figure 1, it is that a kind of MCU IO of zero stand-by power consumption without the remaining bias of direct current simulates LCD drive circuits, its bag
Include：MCU 1 and peripheral circuit 2.
Connect a LCD and show after the MCU 1 has some IO pin, and each two IO pin connect a voltage combiner circuit 3
COM signal ends 4, the voltage of the COM signal ends is two half of IO pin voltage sums being attached thereto.The voltage synthesis
Circuit 3 includes two driving resistance being connected with two IO pin respectively, and the other end of two driving resistance is all connected with same COM
Signal end, and the resistance of two driving resistance is equal.Due to the voltage of COM signal ends be two IO pin voltages being attached thereto it
The half of sum, the i.e. average voltage of COM signal ends is not driven the influence of resistance error, does not result in the electrode of LCD
Aging phenomenon, can extend the service life of LCD.
Because the voltage of COM signal ends is synthesized by the IO pin output voltages of two MCU, when two IO pin electricity of MCU
When pressure is all 0V, resultant voltage is 0V, i.e., COM signal end voltages are 0V, at this moment, between COM signal ends and two IO pin of MCU
Voltage combiner circuit in two drive resistance between no current flow through, so as to zero-power when realizing that LCD is standby.
The quantity of the IO pin is three, including first, second, third IO pin, i.e. PA0, PA1, PA2 in Fig. 1；It is described
The quantity of COM signal ends is in three, including a COM signal ends, the 2nd COM signal ends, the 3rd COM signal ends, i.e. Fig. 1
COM1、COM2、COM3；The quantity of the voltage combiner circuit 3 is three.Wherein, an IO pin and the 2nd IO pin are connected
A COM signal ends are connected after first voltage combiner circuit, an IO pin and the 3rd IO pin connect second voltage and close
The 2nd COM signal ends are connected after into circuit, the 2nd IO pin and the 3rd IO pin are connected after connecting the 3rd voltage combiner circuit
3rd COM signal ends, because the input IO pin of COM1-COM3 are shared two-by-two, the drive waveforms for synthesizing COM1-COM3 only need 3
Individual IO pin (i.e. PA0, PA1, PA2).
Operation principle of the present utility model：
COM1 voltages are synthesized by PA0, PA1 output voltage, as R1=R2 its value be 0.5 (PA0+PA1), COM2 voltages by
PA0, PA2 output voltage synthesize, and as R3=R4, its value is 0.5 (PA0+PA2), and COM3 voltages are closed by PA1, PA2 output voltage
Into as R5=R6, its value is 0.5 (PA1+PA2), and a LCD display cycle is divided into six beats (as shown in Figure 2)：
First beat：PA0=5V, PA1=5V, PA2=0V, COM1=5V, COM2=2.5V, COM3=2.5V；
Second beat：PA0=0V, PA1=0V, PA2=5V, COM1=0V, COM2=2.5V, COM3=2.5V；
3rd beat：PA0=5V, PA1=0V, PA2=5V, COM1=2.5V, COM2=5V, COM3=2.5V；
4th beat：PA0=0V, PA1=5V, PA2=0V, COM1=2.5V, COM2=0V, COM3=2.5V；
5th beat：PA0=0V, PA1=5V, PA2=5V, COM1=2.5V, COM2=2.5V, COM3=5V；
6th beat：PA0=5V, PA1=0V, PA2=0V, COM1=2.5V, COM2=2.5V, COM3=0V；
In the first beat the output voltage of COM2 be 5xR4/ (R3+R4), and in the second beat COM2 output voltage
Be 5xR3/ (R3+R4), the resultant voltage average value in the two beats be 0.5 (5xR4/ (R3+R4)+5xR3/ (R3+R4))=
2.5V, its average value is unrelated with R3, R4, even if so R3, R4 have error, the average value of resultant voltage in the two beats
Also constant is 2.5V.
In sum, the average voltage of COM signal ends is not driven the influence of resistance error in the utility model,
The ageing of electrode phenomenon of LCD is not resulted in, the service life of LCD can be extended.Further, since the voltage of COM signal ends be all by
Two IO pin output voltage synthesis of MCU, when two IO pin voltages of MCU are all 0V, resultant voltage is 0V, i.e. COM signals
Terminal voltage is 0V, at this moment, in the voltage combiner circuit between COM signal ends and two IO pin of MCU between two driving resistance
No current flows through, and so as to zero-power when realizing that LCD is standby, and can reach zero-bias.
Certainly, the foregoing is only specific embodiment of the utility model, not come limit the utility model implement
Scope, all equivalent change or modifications done according to construction, feature and principle described in present utility model application the scope of the claims, all should wrap
Include in present utility model application the scope of the claims.
Claims (4)
1. MCU IO of zero stand-by power consumption without the remaining bias of direct current simulates LCD drive circuits, and it includes：MCU (1) and periphery electricity
Road (2), it is characterised in that：The MCU (1) connects with some IO pin, and after each two IO pin connect a voltage combiner circuit (3)
The COM signal ends (4) that a LCD shows are connect, the voltage of the COM signal ends is two the one of IO pin voltage sums for being attached thereto
Half.
2. MCU IO of zero stand-by power consumption according to claim 1 without the remaining bias of direct current simulates LCD drive circuits, and it is special
Levy and be：The voltage combiner circuit (3) includes be connected with two IO pin respectively two driving resistance, two driving resistance
The other end is all connected with same COM signal ends, and the resistance of two driving resistance is equal.
3. MCU IO of zero stand-by power consumption according to claim 1 without the remaining bias of direct current simulates LCD drive circuits, and it is special
Levy and be：The quantity of the IO pin is three, including first, second, third IO pin；The quantity of the COM signal ends is three,
Including a COM signal ends, the 2nd COM signal ends, the 3rd COM signal ends；The quantity of the voltage combiner circuit (3) is three
It is individual.
4. MCU IO of zero stand-by power consumption according to claim 3 without the remaining bias of direct current simulates LCD drive circuits, and it is special
Levy and be：The first IO pin and the 2nd IO pin are connected and connect after first voltage combiner circuit a COM signal ends, and described the
One IO pin and the 3rd IO pin connect the 2nd COM signal ends, the 2nd IO pin and the 3rd after connecting second voltage combiner circuit
IO pin connect the 3rd COM signal ends after connecting the 3rd voltage combiner circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621173952.4U CN206194350U (en) | 2016-10-26 | 2016-10-26 | Zero stand -by power consumption does not have MCU IO simulation LCD drive circuit of remaining bias voltage of direct current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621173952.4U CN206194350U (en) | 2016-10-26 | 2016-10-26 | Zero stand -by power consumption does not have MCU IO simulation LCD drive circuit of remaining bias voltage of direct current |
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| Publication Number | Publication Date |
|---|---|
| CN206194350U true CN206194350U (en) | 2017-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621173952.4U Expired - Fee Related CN206194350U (en) | 2016-10-26 | 2016-10-26 | Zero stand -by power consumption does not have MCU IO simulation LCD drive circuit of remaining bias voltage of direct current |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733212A (en) * | 2017-10-26 | 2018-02-23 | 东莞启益电器机械有限公司 | Has the direct current of power saving function with exchanging output circuit |
-
2016
- 2016-10-26 CN CN201621173952.4U patent/CN206194350U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733212A (en) * | 2017-10-26 | 2018-02-23 | 东莞启益电器机械有限公司 | Has the direct current of power saving function with exchanging output circuit |
| CN107733212B (en) * | 2017-10-26 | 2024-04-16 | 东莞启益电器机械有限公司 | DC and AC output circuit with energy-saving function |
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Granted publication date: 20170524 |
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| CF01 | Termination of patent right due to non-payment of annual fee |