CN109949775A - A kind of power supply unit of liquid crystal display - Google Patents
A kind of power supply unit of liquid crystal display Download PDFInfo
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- CN109949775A CN109949775A CN201910426389.9A CN201910426389A CN109949775A CN 109949775 A CN109949775 A CN 109949775A CN 201910426389 A CN201910426389 A CN 201910426389A CN 109949775 A CN109949775 A CN 109949775A
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Abstract
The present invention proposes a kind of power supply unit of liquid crystal display, including waveform generating unit, comparing unit, drive control unit, the display device control cell being sequentially connected electrically, show that the output end of device control cell connects liquid crystal panel unit, wherein comparing unit includes comparator, transistor, first resistor, capacitor, second resistance and 3rd resistor, the cathode terminal of comparator is connect with waveform generating unit, and output end is connect with drive control unit；Anode tap, first resistor, capacitor, emitter are connected to point a, and second resistance and 3rd resistor are connect with transistor base.The present invention, by making comparator anode tap voltage realize the reliable and stable operation of system lower than cathode terminal voltage, effectively ensures the working condition of subsequent cell, reduces damage of the abnormality to system during system electrification and power down；So that control signal dutyfactor is raised slowly to a fixed value by the way that capacitor is arranged, improves the performance of system, the stability of lifting system.
Description
Technical field
The invention belongs to liquid crystal driving technical field, especially a kind of power supply unit of liquid crystal display.
Background technique
In traditional liquid crystal display device, the electrical stability of liquid crystal display power supply circuit is not high, and the slow play electricity that charges
Fastly, it is easy to that liquid crystal display is caused to damage during charge and discharge, and then influences the stability of liquid crystal display, because
This, liquid crystal display needs stable power supply plan to be powered, to just can guarantee the normal of display equipment work.Together
When, liquid crystal apparatus is usually integrated circuit, therefore under the premise of guaranteeing that liquid crystal display works normally, it is desirable to provide one
Safely controllable power supply plan avoids the damage of integrated circuit from providing liquid crystal display control device stable power supply signal
Cause economic loss.
Summary of the invention
Technical problem solved by the invention is to provide a kind of power supply unit of liquid crystal display, is not increasing circuit
Under the premise of complexity, realize that charging is fast, electric discharge is slow, can effective protection liquid crystal display, while can guarantee liquid crystal
The steady operation for showing equipment, a possibility that equipment damage, mentions during powering on power down to reduce liquid crystal display
The stability of high system work.
The technical solution for realizing the aim of the invention is as follows:
A kind of power supply unit of liquid crystal display, including waveform generating unit, the comparing unit, drive control being sequentially connected electrically
Unit, display device control cell, waveform generating unit, comparing unit, drive control unit are respectively connected to operation level, show
Show the output end connection liquid crystal panel unit of device control cell, in which:
Waveform generating unit, for receiving externally input level signal and according to the waveform of level signal generation certain frequency
Signal, then waveform signal is sent to comparing unit；
Comparing unit, the waveform signal sent for receiving waveform generating unit, and given birth to after it is compared with direct current signal
It is exported again at driving control signal to drive control unit, the frequency and the frequency phase of waveform signal of the driving control signal
Together；
Drive control unit, the driving control signal sent for receiving comparing unit, and generate stable level signal output
To display device control cell；
It shows device control cell, the stable level signal sent for receiving drive control unit, and is used as driving liquid crystal
The operation level signal of panel unit；
Wherein comparing unit includes comparator, transistor, first resistor, capacitor, second resistance and 3rd resistor, the yin of comparator
The extreme input terminal as comparing unit is connect with the output end of waveform generating unit, and the output end of comparator is as comparing unit
Output end and drive control unit input terminal connect；The anode tap of comparator, one end of first resistor, capacitor one end,
The emitter of transistor is connected to a point a, and the other end of first resistor connects supply voltage, the other end of capacitor, transistor
Collector is all connected with common reference point, and one end of second resistance and one end of 3rd resistor are connect with the base stage of transistor, the
The other end of two resistance connects supply voltage, and the other end of 3rd resistor connects common reference point, and wherein second resistance is adjustable
Resistance.
Further, the power supply unit of liquid crystal display of the invention, waveform generating unit include connected hysteresis ratio
Compared with device and resistance-capacitance network, resistance-capacitance network includes resistance one, resistance two, resistance three, resistance four, resistance five and capacitor two, resistance one,
Resistance three, resistance four one end be all connected with supply voltage, the output end of the other end connection hysteresis loop comparator of resistance four, resistance one
Other end connection hysteresis loop comparator anode tap and resistance two one end, the other end of resistance two connects with one end of capacitor two
Connect common reference point, one end of the other end connection resistance five of resistance three, the other end of capacitor two, resistance five the other end with
The cathode terminal of hysteresis loop comparator connects, and the cathode terminal of hysteresis loop comparator connects comparing unit as the output end of waveform generating unit
Input terminal.
Further, the power supply unit of liquid crystal display of the invention, the waveform signal that waveform generating unit generates are
Two threshold values of triangular signal, the hysteresis loop comparator in waveform generating unit are respectively wave crest level, the wave of triangular signal
Paddy electricity is flat.
Further, the power supply unit of liquid crystal display of the invention, drive control unit include connected switch member
Part and energy-storage travelling wave tube, wherein switch element is a power MOS pipe, and energy-storage travelling wave tube is inductance element and capacity cell, the grid of metal-oxide-semiconductor
Output end of the pole as the input terminal connection comparing unit of drive control unit, drain electrode connection supply voltage, diode, inductance member
Part, capacity cell successively join end to end, and the connected end of diode cathode and inductance element is connect with source electrode, diode cathode and electricity
The connected end for holding element is connect with common reference point, and the connected end of inductance element and capacity cell is as the defeated of drive control unit
The input terminal of outlet connection display device control cell.
Further, the power supply unit of liquid crystal display of the invention, driving control signal are that a duty ratio is adjustable
Pulse-width signal.
Further, the power supply unit of liquid crystal display of the invention, transistor are a p-type triode.
Further, the power supply unit of liquid crystal display of the invention, the resistance value magnitude of first resistor are hundred kilo-ohms, the
The resistance value magnitude of two resistance and 3rd resistor is tens kilo-ohms.
Further, the emitter voltage of the power supply unit of liquid crystal display of the invention, transistor compares base voltage
Big 0.7V.
The invention adopts the above technical scheme compared with prior art, has following technical effect that
1, the power supply unit of liquid crystal display of the invention is under the premise of increasing complexity in circuits, realize charging it is fast,
Electric discharge is slow, can effective protection liquid crystal display, guarantee the steady operation of liquid crystal display；
2, the power supply unit of liquid crystal display of the invention passes through to comparing unit input terminal input signal in upward and downward electric process
Timing controlled, to protect equipment in steady operation and safety, reliability, reduce equipment during powering on power down
A possibility that damage；
3, the power supply unit of liquid crystal display of the invention exports comparing unit by comparing the capacitor inside unit
The duty ratio of control signal is raised slowly to a fixed value, can improve the performance of equipment, the stability of further lifting means
And reliability.
Detailed description of the invention
Fig. 1 is the module frame chart schematic diagram of the power supply unit of liquid crystal display of the invention；
Fig. 2 is the internal element module diagram of the comparing unit of the power supply unit of liquid crystal display of the invention；
Fig. 3 is the signal sequence requirement schematic diagram in the power supply unit course of work of liquid crystal display of the invention；
Fig. 4 is the module diagram of the waveform generating unit of the power supply unit of liquid crystal display of the invention；
Fig. 5 is the module diagram of the drive control unit of the power supply unit of liquid crystal display of the invention.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
A kind of power supply unit of liquid crystal display, including waveform generating unit, the comparing unit, driving being sequentially connected electrically
Control unit, display device control cell, waveform generating unit, comparing unit, drive control unit are respectively connected to work electricity
It is flat, show the level signal output end connection liquid crystal panel unit of device control cell.Wherein:
Waveform generating unit, for receiving externally input level signal and according to the waveform of input signal generation certain frequency
Signal, then the waveform signal is sent to comparing unit.Waveform generating unit includes connected hysteresis loop comparator and resistance-capacitance network,
Resistance-capacitance network includes resistance one, resistance two, resistance three, resistance four, resistance five and capacitor two, resistance one, resistance three, resistance four
One end is all connected with supply voltage, and the output end of the other end connection hysteresis loop comparator of resistance four, the other end of resistance one connects stagnant
The anode tap of comparator and one end of resistance two are returned, the other end of resistance two and one end of capacitor two are all connected with common reference point,
One end of the other end connection resistance five of resistance three, the other end of capacitor two, resistance five the other end with hysteresis loop comparator
Cathode terminal connection, the cathode terminal of hysteresis loop comparator connect the input terminal of comparing unit as the output end of waveform generating unit.Wave
The waveform signal that shape generating unit generates is triangular signal, and two threshold values of hysteresis loop comparator are respectively the wave of triangular signal
Peak level, trough level.
Comparing unit, the waveform signal sent for receiving waveform generating unit, and it is compared with direct current signal
It generates driving control signal afterwards to be exported again to drive control unit, the frequency of the driving control signal and the frequency of waveform signal
It is identical, and driving control signal is the adjustable pulse-width signal of a duty ratio.Comparing unit includes comparator, transistor,
One resistance, capacitor, second resistance and 3rd resistor, the cathode terminal of comparator occur single as the input terminal and waveform of comparing unit
The output end of the output end connection of member, comparator is connected as the output end of comparing unit and the input terminal of drive control unit；
The anode tap of comparator, one end of first resistor, one end of capacitor, transistor emitter be connected to a point a, first resistor
The other end connects supply voltage, and the other end of capacitor, the collector of transistor are all connected with common reference point, one end of second resistance
It is connect with the base stage of transistor with one end of 3rd resistor, the other end of second resistance connects supply voltage, 3rd resistor
The other end connects common reference point, and wherein second resistance is adjustable resistance, and transistor is a p-type triode, the transmitting of transistor
Pole tension is 0.7V bigger than base voltage, and the resistance value magnitude of first resistor is hundred kilo-ohms, the resistance value amount of second resistance and 3rd resistor
Grade is tens kilo-ohms.
Drive control unit, the driving control signal sent for receiving comparing unit, and generate stable level signal
Output extremely display device control cell.Drive control unit includes connected switch element and energy-storage travelling wave tube, wherein switch element
For a power MOS pipe, energy-storage travelling wave tube is inductance element and capacity cell, input of the grid of metal-oxide-semiconductor as drive control unit
The output end of end connection comparing unit, drain electrode connection supply voltage, diode, inductance element, capacity cell successively join end to end,
The connected end of diode cathode and inductance element is connect with source electrode, the connected end and common reference of diode cathode and capacity cell
Output end connection display device control cell of the connected end of point connection, inductance element and capacity cell as drive control unit
Input terminal.
Show device control cell, the stable level signal sent for receiving drive control unit is used as driving liquid
The operation level signal of crystal face plate unit.
Embodiment 1
As shown in Figure 1, the power supply unit of liquid crystal display proposed by the invention includes that list occurs for the waveform being sequentially connected electrically
Member, comparing unit, drive control unit and display device control cell composition, waveform generating unit, comparing unit, drive control
Unit is respectively connected to operation level VIN, shows the output end connection liquid crystal panel unit of device control cell.
Needed for waveform generating unit receives externally input level signal VIN and generates comparing unit according to the input signal
The waveform signal for the certain frequency wanted.As shown in figure 4, waveform generating unit includes connected hysteresis loop comparator and resistance-capacitance network,
Resistance-capacitance network includes resistance RK1, resistance RK2, resistance RK3, resistance RK4, resistance RK5 and capacitor CK, resistance RK1, resistance RK3,
One end of resistance RK4 is all connected with supply voltage VIN, the output end of the other end connection hysteresis loop comparator of resistance RK4, resistance RK1
Other end connection hysteresis loop comparator anode tap and resistance RK2 one end, one end of the other end and capacitor CK of resistance RK2 is equal
Connect common reference point, one end of the other end connection resistance RK5 of resistance RK3, the other end of capacitor CK, resistance RK5 it is another
End is connect with the cathode terminal of hysteresis loop comparator, and the cathode terminal of hysteresis loop comparator connects ratio as the output end of waveform generating unit
Compared with the input terminal of unit.In the present embodiment, the signal that waveform generating unit generates is a triangular signal, is compared by hysteresis
Device sets the level of two threshold value, that is, triangular signal wave crests and trough to the level signal of input, further according to internal capacitance-resistance
Network generates the fixed triangular signal of a frequency.Modify the adjustable generation triangular signal of parameter of resistance-capacitance network
Frequency, the frequency of the triangular wave determine the frequency of the driving control signal of comparing unit output, which is output to ratio
Compared in unit.
Comparing unit receives the triangular wave model of waveform generating unit output, and is input to the comparator inside comparing unit
Cathode terminal, and be compared with the input signal of anode tap, realize the output of driving control signal.The driving control signal is
One pulse-width modulation PWM signal, the frequency of the pwm signal are identical as the frequency of the triangular signal.The anode tap of comparator
Input is a DC level signal, and the accounting which controls output pwm signal is empty, by adjusting level signal
Just, it can control the size of output PWM duty cycle.As shown in Fig. 2, comparing unit includes comparator B, transistor Q, resistance
R1, capacitor C, adjustable resistance R2 and resistance R3.The anode tap of comparator B is connected with one end of resistance R1, the cathode of comparator B
End is connected with the output end of waveform generating unit 10.The other end of resistance R1 is connected with supply voltage.One end of capacitor C with
One end of resistance R1 is connected, and the other end is connected with common reference point.The pole e of transistor Q is connected with capacitor C, resistance R1
Endpoint is connected, and the pole c of transistor Q is connected with common reference point, and the pole b of transistor Q is connected with one end of resistance R3, electricity
The other end of resistance R3 is connected with common reference point.One end of adjustable resistance R2 is connected with supply voltage, the other end and crystal
The pole b of pipe Q is connected.The control signal that comparing unit 20 exports is a pulse width adjustment signal (PWM) signal, the control
The duty ratio of signal be it is adjustable, when the frequency of waveform generating unit 10 is fixed, which is that the period is constant, duty ratio
Variable signal.
Drive control unit receives the driving control signal of comparing unit output, passes through control driving unit internal switch member
The work of part and energy-storage travelling wave tube, the stable output of level signal needed for realizing display device control cell.In the present embodiment
In, as shown in figure 5, switch element is a power MOS pipe, energy-storage travelling wave tube is inductance component L and capacity cell Cd, the grid of metal-oxide-semiconductor
Output end of the pole as the input terminal connection comparing unit of drive control unit, the drain electrode of metal-oxide-semiconductor connect supply voltage VIN, and two
Pole pipe D, inductance component L, capacity cell Cd successively join end to end, the connected end and metal-oxide-semiconductor of diode D cathode and inductance component L
Source electrode connection, diode D anode connect with the connected end of capacity cell Cd with common reference point, and inductance component L is first with capacitor
Input terminal of the connected end of part Cd as the output end connection display device control cell of drive control unit.Driving unit receives
Pwm control signal, realizes the switch to MOS and the normal work by inductance element and afterflow work two states are realized and stablized
The generation of level.
Display device control cell is the stable level signal by receiving driving unit output, to drive liquid crystal display panel
The normal display and work of unit.
The voltage of drive control unit output is changed according to the variation of the duty ratio of comparing unit output, when can power transformation
When resistance R2 is adjusted to a certain determining resistance value, the voltage of drive control unit output is certain value.The control letter of comparing unit output
Number frequency it is identical as the waveform frequency that waveform generating unit generates, by being adjusted and controlling inside waveform generating unit.Than
Anode tap compared with the comparator B in unit is connected with one end of capacitor C, mainly realizes anode tap voltage electricity by RC network
Flat slow rising realizes that the duty ratio of the control signal of comparing unit output gradually rises to a certain fixed value, Ke Yishi by 0
The slow start-up course of existing subsequent drive control unit, to protect subsequent drive control unit and display device control cell
Stabilization and reliable working condition.In the present embodiment, transistor Q is a p-type triode, one end of its pole E and capacitor
It is connected, the voltage at the both ends capacitor C is determined by the partial pressure of resistance R2 and R3, can determine transistor by the partial pressure of two resistance
The b pole tension of Q is realized to realize that voltage follow changes according to the fixed level difference of the characteristic be of transistor to relatively more single
The control and restriction of Yuanyang extreme voltage.In the present embodiment, adjustable resistance R2 and resistance R3 are tens kilo-ohms, and resistance R1 is hundred
Kilo-ohm.When the voltage Vb of the pole transistor b is determined by adjustable resistance R2 and resistance R3, e pole tension is that Ve is equal to Vb+0.7V.
Embodiment 2
As shown in figure 3, the figure has shown working sequence requirement of present apparatus during whole system switching on and shutting down.In system electrification
During power down, the anode tap voltage of comparator must be no lower than cathode terminal voltage to realize the reliable and stable operation of system
To then will lead to occur inside drive control unit electric current it is excessive cause damage so as to cause display device control cell can not be steady
Fixed work.
Specifically, during system electrification, control is realized by the resistance value and the capacitance of capacitor C that control resistance R2
The rate that voltage on capacitor C rises ensures electricity of the voltage (i.e. voltage capacitor C on) lower than cathode terminal of transistor anode tap
Press the rate of (i.e. triangle wave voltage) variation.In the present embodiment, when setting Vb=7.3V, when a system is powered up, triangular wave is established
Time be T1=20ms, therefore, to assure that the voltage of Ve rises to the time of 8v, i.e. capacitor C on voltage rising slope and triangle
The time T2 of wave intersection has to be larger than 20ms.It can be effectively protected in power up in this way, subsequent cell
Safe and reliable work.Meanwhile during voltage on capacitor C rises, when capacitor C voltage gradually rises to 8V by 0
During, when voltage moves closer to 8v on capacitor, transistor is in the conductive state at this time, at this time the process electricity of supply voltage
Resistance R1 is discharged by transistor Q.When capacitance voltage C is lower than 8V, transistor Q is in off state at this time, so that capacitor C
Voltage continue to be charged to 8V by resistance R1, so that the voltage of capacitor C be made to be in the stable state supply comparator B of 8V
Anode tap, realize power up system work stabilization.During when the T3 moment, system is powered down, by transistor Q come real
The power down rate of voltage exists lower than the rate that the voltage of cathode terminal waveform generating unit output declines to realize on existing capacitor C
The appearance of abnormal conditions is reduced in the dynamic process of system power-on and power-off.During system is in power down, the voltage of Vb is 0V, by
It cannot be mutated in the voltage on capacitor, the voltage on capacitor C remains as 8V at this time, and transistor Q is connected at this time, the electricity on capacitor C
Pressure is rapidly performed by electric discharge by transistor, so that the slope that the voltage on capacitor C declines is greater than the slope of triangular wave decline, from
And guarantee system in the security and reliability of power down process.During system steady operation, comparing unit can be exported surely
Fixed control signal guarantees the normal work of display unit.
The above is only some embodiments of the invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, several improvement can also be made, these improvement should be regarded as guarantor of the invention
Protect range.
Claims (8)
1. a kind of power supply unit of liquid crystal display, which is characterized in that including be sequentially connected electrically waveform generating unit, compare
Unit, drive control unit, display device control cell, waveform generating unit, comparing unit, drive control unit respectively connect
There is operation level, show the level signal output end connection liquid crystal panel unit of device control cell, in which:
Waveform generating unit, for receiving externally input level signal and according to the waveform of level signal generation certain frequency
Signal, then the waveform signal is sent to comparing unit；
Comparing unit, the waveform signal sent for receiving waveform generating unit, and given birth to after it is compared with direct current signal
It is exported again at driving control signal to drive control unit, the frequency and the frequency phase of waveform signal of the driving control signal
Together；
Drive control unit, the driving control signal sent for receiving comparing unit, and generate stable level signal output
To display device control cell；
Device control cell is shown, for receiving stable level signal that drive control unit is sent and being used as driving liquid crystal surface
The operation level signal of plate unit；
Wherein comparing unit includes comparator, transistor, first resistor, capacitor, second resistance and 3rd resistor, the yin of comparator
The extreme input terminal as comparing unit is connect with the output end of waveform generating unit, and the output end of comparator is as comparing unit
Output end and drive control unit input terminal connect；The anode tap of comparator, one end of first resistor, capacitor one end,
The emitter of transistor is connected to a point a, and the other end of first resistor connects supply voltage, the other end of capacitor, transistor
Collector is all connected with common reference point, and one end of second resistance and one end of 3rd resistor are connect with the base stage of transistor, the
The other end of two resistance connects supply voltage, and the other end of 3rd resistor connects common reference point, and wherein second resistance is adjustable
Resistance.
2. the power supply unit of liquid crystal display according to claim 1, which is characterized in that waveform generating unit includes phase
Hysteresis loop comparator and resistance-capacitance network even, resistance-capacitance network includes resistance one, resistance two, resistance three, resistance four, resistance five and capacitor
Two, resistance one, resistance three, resistance four one end be all connected with supply voltage, the other end connection hysteresis loop comparator of resistance four it is defeated
Outlet, the anode tap of the other end connection hysteresis loop comparator of resistance one and one end of resistance two, the other end and capacitor of resistance two
Two one end is all connected with common reference point, one end of the other end connection resistance five of resistance three, the other end, the resistance five of capacitor two
The other end connect with the cathode terminal of hysteresis loop comparator, output end of the cathode terminal of hysteresis loop comparator as waveform generating unit
Connect the input terminal of comparing unit.
3. the power supply unit of liquid crystal display according to claim 1 or 2, which is characterized in that waveform generating unit produces
Raw waveform signal is triangular signal, and two threshold values of the hysteresis loop comparator in waveform generating unit are respectively triangular signal
Wave crest level, trough level.
4. the power supply unit of liquid crystal display according to claim 1, which is characterized in that drive control unit includes phase
Switch element and energy-storage travelling wave tube even, wherein switch element is a power MOS pipe, and energy-storage travelling wave tube is inductance element and capacitor member
Part, the grid of metal-oxide-semiconductor connect the output end of comparing unit as the input terminal of drive control unit, and drain electrode connects supply voltage,
Diode, inductance element, capacity cell successively join end to end, and the connected end of diode cathode and inductance element is connect with source electrode,
The connected end of diode cathode and capacity cell is connect with common reference point, and the connected end of inductance element and capacity cell is as drive
The input terminal of the output end connection display device control cell of dynamic control unit.
5. the power supply unit of liquid crystal display according to claim 1, which is characterized in that driving control signal accounts for for one
Sky is than adjustable pulse-width signal.
6. the power supply unit of liquid crystal display according to claim 1, which is characterized in that transistor is three pole of a p-type
Pipe.
7. the power supply unit of liquid crystal display according to claim 1, which is characterized in that the resistance value magnitude of first resistor
It is hundred kilo-ohms, the resistance value magnitude of second resistance and 3rd resistor is tens kilo-ohms.
8. the power supply unit of liquid crystal display according to claim 1, which is characterized in that the emitter voltage of transistor
It is 0.7V bigger than base voltage.
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| CN201910426389.9A CN109949775A (en) | 2019-05-22 | 2019-05-22 | A kind of power supply unit of liquid crystal display |
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| CN201910426389.9A CN109949775A (en) | 2019-05-22 | 2019-05-22 | A kind of power supply unit of liquid crystal display |
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| CN111883085A (en) * | 2020-09-28 | 2020-11-03 | 南京熊猫电子制造有限公司 | Device for improving stable work of liquid crystal equipment |
| CN115472125A (en) * | 2022-08-26 | 2022-12-13 | 惠科股份有限公司 | Driving circuit of display panel and display device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111883085A (en) * | 2020-09-28 | 2020-11-03 | 南京熊猫电子制造有限公司 | Device for improving stable work of liquid crystal equipment |
| CN115472125A (en) * | 2022-08-26 | 2022-12-13 | 惠科股份有限公司 | Driving circuit of display panel and display device |
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| CN115472125B (en) * | 2022-08-26 | 2024-02-27 | 惠科股份有限公司 | Driving circuit of display panel and display device |
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Application publication date: 20190628 |