CN205847412U - A kind of liquid crystal display screen power control switch circuit and display device - Google Patents
A kind of liquid crystal display screen power control switch circuit and display device Download PDFInfo
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- CN205847412U CN205847412U CN201620423480.7U CN201620423480U CN205847412U CN 205847412 U CN205847412 U CN 205847412U CN 201620423480 U CN201620423480 U CN 201620423480U CN 205847412 U CN205847412 U CN 205847412U
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Abstract
This utility model embodiment discloses a kind of liquid crystal display screen power control switch circuit and display device, original fundamental circuit is carried out parameter optimization, make circuit can more meet liquid crystal display screen TCON circuit in actual applications and the timing requirements of power supply is increased crystal diode on the basis of original fundamental circuit, diode forward is utilized to turn on, reversely cut-off characteristics, on-off circuit work in i.e. meet liquid crystal display screen TCON circuit power rise sequential requirement, solve again the problem that power-off sequential is likely to occur supply voltage concussion, thus solve liquid crystal display screen TCON circuit switching circuit of power supply and produce TCON terminal voltage concussion problem when off, effectively prevent partial liquid crystal screen and power concussion and the phenomenon that breaks down occurs due to power down, improve the reliability of LCD TV product.
Description
Technical field
This utility model embodiment relates to the technical field of liquid crystal TV set, particularly relates to a kind of liquid crystal display screen power supply control and opens
Close circuit and display device.
Background technology
The TCON circuit of liquid crystal display screen needs outside+5V or+12V DC source to power, and power supply is provided by outside, simultaneously TCON
Circuit work all has timing requirements to power supply electrifying, power down, need to increase power switch control circuit, meet its timing requirements, protects
Card liquid crystal display screen normally works.The most general ON-OFF control circuit is mainly by external control signal, audion, fet
And periphery resistance capacitance constitutes loop, such as Fig. 1.
Fundamental circuit is controlled audion Q0L3 base stage by outside PANEL_ON/OFF signal, controls PM OS by colelctor electrode
Fet U0L1 grid realizes VCC_PANEL and powers break-make.
Fundamental circuit solves electrifying timing sequence TCON circuit to the power supply VCC_PANEL rise time > requirement of 0.5mS, but
Shortcoming is that on-off circuit cuts out not rapidly, and when causing outside transmission OFF signal, VCC_PANEL voltage there will be height concussion,
Liquid crystal display screen fault can be caused time serious.It show as Fig. 2 reaches the standard grade and join VCC_PANEL electricity when certain liquid crystal display screen on-off circuit turns off
Pressure situation of change, roll off the production line the curent change waveform into TCON.
Summary of the invention
The purpose of this utility model embodiment is to propose a kind of liquid crystal display screen power control switch circuit and display device, purport
Solving the problem that minimizing prior art breaker in middle circuit rapidly results in height concussion not.
For reaching this purpose, this utility model embodiment by the following technical solutions:
First aspect, a kind of liquid crystal display screen power control switch circuit, described liquid crystal display screen power control switch circuit includes using
In controlling filed effect triode ON and the switch element of shutoff, it is used for controlling described fet ON time and shutoff
The sequence circuit of time and for controlling the fet circuit of whole contactor；
Described sequence circuit includes controlling the resistance R0L9 of described fet turn-off time, controlling described field effect
The resistance R0L1 of triode ON time, electric capacity C0L2 and control described resistance R0L1 to described fet conducting and close
Disconnected diode D0L1.
Preferably, described switch element includes transistor circuit.
Preferably, the positive pole of described diode D0L1 respectively with the colelctor electrode of described audion, described resistance R0L9 another
One end of one end and described resistance R0L1 connects, negative pole respectively with the other end of described resistance R0L1, described electric capacity C0L2 another
The grid of one end and described fet connects.
Preferably, described resistance R0L9 one end is connected with positive source, and the other end is connected with the colelctor electrode of audion；
Described resistance R0L1 one end is connected with the other end of described R0L9, the other end respectively with another of described electric capacity C0L2
End, the grid of the negative pole of described diode D0L1, fet connect；
Described electric capacity C0L2 one end is connected with described positive source, the other end and the other end of described resistance R0L1, described
The negative pole of diode and the grid of described fet connect.
Preferably, the resistance of described resistance R0L9 is less than 10K Ω.
Preferably, the resistance of described resistance R0L9 is 4.7K Ω.
Preferably, the resistance of described resistance R0L1 is more than 100K Ω.
Preferably, the resistance of described resistance R0L1 is 220K Ω.
Preferably, described diode D0L1 model is 1N4148W.
Preferably, described electric capacity C0L2 is 220nF.
Second aspect, described display device includes above-mentioned liquid crystal display screen power control switch circuit.
This utility model embodiment provides a kind of liquid crystal display screen power control switch circuit, described liquid crystal display screen power control switch
Circuit includes for controlling filed effect triode ON and the switch element of shutoff, for controlling the conducting of described fet
Time and the sequence circuit of turn-off time and for controlling the fet circuit of whole contactor；Described sequence circuit
Including controlling the resistance R0L9 of described fet turn-off time, controlling the resistance of described fet ON time
R0L1, electric capacity C0L2 and control the described resistance R0L1 diode D0L1 to described fet turn-on and turn-off, to former
There is fundamental circuit to carry out parameter optimization, make circuit can more meet liquid crystal display screen TCON circuit in actual applications and the sequential of power supply is wanted
Seeking increase crystal diode on the basis of original fundamental circuit, utilize diode forward to turn on, reverse cut-off characteristics, at switch electricity
Road work in i.e. meet liquid crystal display screen TCON circuit power rise sequential requirement, solve again power-off sequential and be likely to occur power supply
The problem of oscillation, thus solve liquid crystal display screen TCON circuit switching circuit of power supply and produce the concussion of TCON terminal voltage when off
Problem, effectively prevent partial liquid crystal screen due to power down and powers concussion and the phenomenon that breaks down occurs, improve LCD TV production
The reliability of product.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of liquid crystal display screen power control switch circuit that prior art provides；
Fig. 2 is a kind of liquid crystal display screen power control switch circuit voltage schematic diagram that prior art provides；
Fig. 3 is the structural representation of a kind of liquid crystal display screen power control switch circuit that this utility model provides；
Fig. 4 is a kind of liquid crystal display screen power control switch circuit voltage schematic diagram that this utility model provides.
Detailed description of the invention
With embodiment, this utility model embodiment is described in further detail below in conjunction with the accompanying drawings.May be appreciated
It is that specific embodiment described herein is used only for explaining this utility model embodiment, rather than to this utility model embodiment
Restriction.It also should be noted that, for the ease of describing, accompanying drawing illustrate only relevant to this utility model embodiment
Part rather than entire infrastructure.
It is the structural representation of a kind of liquid crystal display screen power control switch circuit that this utility model provides with reference to Fig. 3, Fig. 3.
In figure 3, described liquid crystal display screen power control switch circuit includes for controlling filed effect triode ON and shutoff
Switch element, for controlling described fet ON time and the sequence circuit of turn-off time and whole for controlling
The fet circuit of contactor；
Described sequence circuit includes controlling the resistance R0L9 of described fet turn-off time, controlling described field effect
The resistance R0L1 of triode ON time, electric capacity C0L2 and control described resistance R0L1 to described fet conducting and close
Disconnected diode D0L1.
Preferably, described switch element includes transistor circuit.
Preferably, the positive pole of described diode D0L1 respectively with the colelctor electrode of described audion, described resistance R0L9 another
One end of one end and described resistance R0L1 connects, negative pole respectively with the other end of described resistance R0L1, described electric capacity C0L2 another
The grid of one end and described fet connects.
Preferably, described resistance R0L9 one end is connected with positive source, and the other end is connected with the colelctor electrode of audion；
Described resistance R0L1 one end is connected with the other end of described R0L9, the other end respectively with another of described electric capacity C0L2
End, the grid of the negative pole of described diode D0L1, fet connect；
Described electric capacity C0L2 one end is connected with described positive source, the other end and the other end of described resistance R0L1, described
The negative pole of diode and the grid of described fet connect.
Preferably, the resistance of described resistance R0L9 is less than 10K Ω.
Preferably, the resistance of described resistance R0L9 is 4.7K Ω.
Preferably, the resistance of described resistance R0L1 is more than 100K Ω.
Preferably, the resistance of described resistance R0L1 is 220K Ω.
Preferably, described diode D0L1 model is 1N4148W.
Preferably, described electric capacity C0L2 is 220nF.
Concrete, why can be there will be concussion in the analysis of prior art circuits, be to close at on-off circuit
When closing, fet conducting resistance is gradually increased, and VCC_PANEL voltage declines therewith, but TCON still locates in working order,
When being down to about 5V, TCON quits work, and VCC_PANEL load lightens, and now fet does not complete switches off, and still locates
In conducting state, therefore when load lightens, TCON is powered on capacity charge by+12V_NOR by field effect transistor U0L1, on voltage
Rising, when rising to certain voltage, TCON starts working, and VCC_PANEL voltage declines, and stops again work to certain voltage value (about 7V)
Making, voltage rises, and the most repeatedly, until U0L1 complete switches off, VCC_PANEL the most really departs from charge and discharge cycles, is completely in
Discharge condition.
Power down oscillation problem to be solved, need to shorten the turn-off time of fet as far as possible.Analyze basic returning
Road, U0L1 is PMOS fet, and during conducting, Vgs is-12V, and during shutoff, Vgs is 0V.R0L9 major control three in circuit
Pole pipe Q0L3 collector saturation current, R0L9 is the biggest, and saturation current is the least, and this resistance influences whether on-off circuit electric capacity simultaneously
In the charging interval of C0L2, R0L9 is the biggest, and the charging interval is the longest, and this means that the turn-off time of fet U0L1 more
Long.For shortening the turn-off time of U0L1 as far as possible, R0L9 should be the least.
Having an impact the U0L1 turn-off time except R0L9 in circuit, the charging interval of C0L2 is the most also had an impact by R0L1,
Relation is identical with R0L9, but the ON time of U0L1 also can be had an impact by R0L1, according to PANEL power supply timing requirements, U0L1's
The fully on time need to be more than 0.5mS, and therefore R0L1 need to take a desired value.
Improvement of circuit measure is as follows:
First, reduce R0L9 resistance, resistance is changed to 4.7K Ω by 10K Ω；
Second, increase R0L1 resistance, for guaranteeing that the fully on time of U0L1, at more than 0.5mS, can suitably increase R0L1
R0L1 resistance, to increase the discharge time of C0L2, is changed to 220K Ω by 100K Ω for this by resistance；
The increase of the 3rd, R0L1 resistance can extend the turn-off time of U0L1, wishes again the increase by R0L1 resistance simultaneously
Extending the service time of U0L1, for this at one diode of R0L1 two ends parallel connection, when PANEL_ON signal is given, R0L1 acts as
With, when PANEL_OFF signal is given, R0L1 is fallen by bypass diode, thus eliminates R0L1 resistance and increase when turning off U0L1
Between impact.
After above-mentioned ameliorative measure, when on-off circuit cuts out, the reforming phenomena of VCC_PANEL voltage is completely eliminated,
Reaching the standard grade of VCC_PANEL voltage waveform such as Fig. 4 now is shown.
In an embodiment, liquid crystal display screen power control switch circuit, it is characterized in that control signal PANEL_ON/OFF and crystal
Transistor base connects and composes primary DC switch circuit, and primary switching circuit penetrates collection controlling filed effect three by crystal triode
Pole tube grid realizes conducting and the shutoff of effect audion source electrode and drain electrode, thus opening of realizing that liquid crystal display screen TCON circuit powers
Close.So that fet conducting and turn-off time adjustable, penetrate increase resistance capacitance group on collection at transistor
Close, by adjusting resistance capacitance parameter, meet the requirement for power supply timing of the liquid crystal display screen TCON circuit.
Main element in circuit:
Crystal triode uses the crystal triode KMBT3904 of NPN type.
Fet uses PMOS ME9435.
Crystal diode uses universal models 1N4148.
Physical circuit composition as follows: Q0L3 be KMBT3904, U0L1 be ME9435, D0L1 be that 1N4148W, C0L1 are
100nF, C0L3 be 100nF, C0L2 be 220nF, R0L1 be 220K Ω, R0L8 be 10K Ω and R0L9 be 4.7K Ω.
VCC_PANEL is the driving power supply of liquid crystal display screen TCON circuit, and+12V_NOR is external power supply, external control signal
On-off circuit is controlled by PANEL_ON/OFF by resistance R0L8.When PANEL_ON/OFF is high, audion Q0L3 leads
Logical, U0L1 grid voltage finally tends to 0V with the RC discharge loop of resistance R0L1 and electric capacity C0L2 composition, now gate source voltage
Vgs is-12V, and PMOS turns on, and VCC_PANEL and+12V_NOR connects, and is equivalent to power switch and connects；Work as PANEL_ON/
When OFF is low, audion Q0L3 ends, and the RC that U0L1 grid voltage is constituted with resistance R0L1, R0L9 and electric capacity C0L2 charges back
Road and finally tend to 12V, now gate source voltage Vgs is 0V, PMOS end, VCC_PANEL and+12V_NOR disconnects, quite
Disconnect in power switch.Electric capacity C0L1, C0L3 are the decoupling capacitor of current supply circuit.
Preferably, this utility model embodiment also includes a kind of display device, and described display device includes the liquid crystal shown in Fig. 3
Screen power control switch circuit.
This utility model embodiment provides a kind of liquid crystal display screen power control switch circuit and display device, and described liquid crystal display screen supplies
Electric control switch circuit includes for controlling filed effect triode ON and the switch element of shutoff, for controlling described field effect
Triode ON time and the sequence circuit of turn-off time and for controlling the fet circuit of whole contactor；Institute
State sequence circuit to include controlling the resistance R0L9 of described fet turn-off time, control the conducting of described fet
The resistance R0L1 of time, electric capacity C0L2 and control the described resistance R0L1 diode to described fet turn-on and turn-off
D0L1, carries out parameter optimization to original fundamental circuit, makes circuit can more meet liquid crystal display screen TCON circuit in actual applications to confession
The timing requirements of electricity increases crystal diode on the basis of original fundamental circuit, utilizes diode forward to turn on, reversely ends spy
Property, on-off circuit work in i.e. meet liquid crystal display screen TCON circuit power rise sequential requirement, solve again power-off sequential
The problem being likely to occur supply voltage concussion, thus solve liquid crystal display screen TCON circuit switching circuit of power supply and produce when off
TCON terminal voltage concussion problem, effectively prevent partial liquid crystal screen due to power down and powers concussion and the phenomenon that breaks down occurs,
Improve the reliability of LCD TV product.
The know-why of this utility model embodiment is described above in association with specific embodiment.These describe and are intended merely to solve
Release the principle of this utility model embodiment, and the limit to this utility model embodiment protection domain can not be construed to by any way
System.Based on explanation herein, those skilled in the art need not pay performing creative labour can associate this utility model
Other detailed description of the invention of embodiment, within these modes fall within the protection domain of this utility model embodiment.
Claims (10)
1. a liquid crystal display screen power control switch circuit, it is characterised in that described liquid crystal display screen power control switch circuit includes using
In controlling filed effect triode ON and the switch element of shutoff, it is used for controlling described fet ON time and shutoff
The sequence circuit of time and for controlling the fet circuit of whole contactor；
Described sequence circuit includes controlling the resistance R0L9 of described fet turn-off time, controlling described field effect three pole
The resistance R0L1 of pipe ON time, electric capacity C0L2 and control described resistance R0L1 to described fet turn-on and turn-off
Diode D0L1.
Liquid crystal display screen power control switch circuit the most according to claim 1, it is characterised in that described switch element includes three
Pole pipe circuit.
Liquid crystal display screen power control switch circuit the most according to claim 2, it is characterised in that
The positive pole of described diode D0L1 respectively with the colelctor electrode of described audion, the other end of described resistance R0L9 and described electricity
Resistance R0L1 one end connect, negative pole respectively with the other end of described resistance R0L1, the other end of described electric capacity C0L2 and described field
The grid of effect audion connects.
Liquid crystal display screen power control switch circuit the most according to claim 3, it is characterised in that
Described resistance R0L9 one end is connected with positive source, and the other end is connected with the colelctor electrode of described audion；
Described resistance R0L1 one end is connected with the other end of described R0L9, the other end respectively with the other end of described electric capacity C0L2,
The negative pole of described diode D0L1, the grid of fet connect；
Described electric capacity C0L2 one end is connected with described positive source, the other end and the other end of described resistance R0L1, described two poles
The negative pole of pipe and the grid of described fet connect.
Liquid crystal display screen power control switch circuit the most according to claim 1, it is characterised in that the resistance of described resistance R0L9
Less than 10K Ω.
Liquid crystal display screen power control switch circuit the most according to claim 5, it is characterised in that the resistance of described resistance R0L9
For 4.7K Ω.
Liquid crystal display screen power control switch circuit the most according to claim 1, it is characterised in that the resistance of described resistance R0L1
More than 100K Ω.
Liquid crystal display screen power control switch circuit the most according to claim 7, it is characterised in that the resistance of described resistance R0L1
For 220K Ω.
Liquid crystal display screen power control switch circuit the most according to claim 1, it is characterised in that described diode D0L1 model
For 1N4148W；Described electric capacity C0L2 is 220nF.
10. a display device, it is characterised in that described display device includes the liquid crystal described in claim 1 to 9 any one
Screen power control switch circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620423480.7U CN205847412U (en) | 2016-05-11 | 2016-05-11 | A kind of liquid crystal display screen power control switch circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620423480.7U CN205847412U (en) | 2016-05-11 | 2016-05-11 | A kind of liquid crystal display screen power control switch circuit and display device |
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| CN205847412U true CN205847412U (en) | 2016-12-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108986758A (en) * | 2018-07-23 | 2018-12-11 | 京东方科技集团股份有限公司 | Power-on time sequence control circuit, its driving method and printed circuit board, display panel |
-
2016
- 2016-05-11 CN CN201620423480.7U patent/CN205847412U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108986758A (en) * | 2018-07-23 | 2018-12-11 | 京东方科技集团股份有限公司 | Power-on time sequence control circuit, its driving method and printed circuit board, display panel |
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