CN208190249U - A kind of LCD protection circuit - Google Patents
A kind of LCD protection circuit Download PDFInfo
- Publication number
- CN208190249U CN208190249U CN201820848119.8U CN201820848119U CN208190249U CN 208190249 U CN208190249 U CN 208190249U CN 201820848119 U CN201820848119 U CN 201820848119U CN 208190249 U CN208190249 U CN 208190249U
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- China
- Prior art keywords
- resistance
- lcd
- signal output
- protection element
- capacitor
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Abstract
The utility model discloses a kind of LCD, and circuit, including mainboard MCU, LCD display module and protection circuit, the mainboard MCU to be protected to be equipped with several signal output interfaces;The LCD display module is equipped with LCD and shows driving interface;The protection circuit includes electrostatic protection element ESD1~electrostatic protection element ESD4, resistance R1~resistance R4, capacitor C1~capacitor C4.This LCD protects circuit, avoids cmos circuit from being played a very good protection by electrostatic breakdown to component by electrostatic protection element ESD1~electrostatic protection element ESD4 of connection;Resistance R1 constitutes filter circuit with C4 after capacitor C1, resistance R2 and capacitor C2, resistance R3 and capacitor C3 and resistance R4 and capacitor; the vibration frequency signal for avoiding electrostatic from generating impacts the work of component; co-mode coil La and co-mode coil Lb is when external disturbance leads to electric leakage beyond electrical boundaries or deposition dust; it will be released in the form of electric arc, to protect LCD mould group;Overall work is stablized, good to component protecting effect.
Description
Technical field
The utility model relates to LCD display device technical field, specially a kind of LCD protects circuit.
Background technique
LCD module is LCM (LCD Module) i.e. LCD display module, refers to and is integrated together glass and LCD driver
LCD show product, the LCD that he provides one standard of user shows driving interface (having 4,8, the different type such as VGA),
User operate control LCD always according to interface requirement and correctly shows.
Control, driving circuit in module are the cmos circuits of low pressure, micro energy lose, easily by electrostatic breakdown, usual LCD mould
The data transmission rate of block is less than 20Mbps, so the protective device less than 40pf can be used, therefore proposes a kind of LCD protection electricity
Road.
Utility model content
The purpose of this utility model is to provide a kind of LCD to protect circuit, has the operation is stable, to component protecting effect
Good advantage solves the problems, such as that the cmos circuit in LCD display module in the prior art is easily damaged by electrostatic breakdown.
To achieve the above object, the utility model provides the following technical solutions: a kind of LCD protection circuit, including mainboard
MCU, LCD display module and protection circuit, the mainboard MCU are equipped with several signal output interfaces, several signal output interfaces
Including No. 1 signal output interface, No. 2 signal output interfaces, No. 3 signal output interfaces, No. 4 signal output interfaces and No. 5 letters
Number output terminal, between No. 1 signal output interface and No. 2 signal output interfaces and is connected to co-mode coil La, No. 3 signal output interfaces
Between No. 4 signal output interfaces and it is connected to co-mode coil Lb;The LCD display module is equipped with LCD and shows driving interface, LCD
Show that driving interface includes driving display interface terminal D1, display driving interface terminal D2, display driving interface terminal D3, display
Driving interface terminal D4 and signal ground terminal;The protection circuit includes electrostatic protection element ESD1~electrostatic protection element
ESD4, resistance R1~resistance R4, capacitor C1~capacitor C4, No. 1 signal output interface, No. 2 signal output interfaces, No. 3 signals are defeated
Outgoing interface and No. 4 signal output interface difference series resistor R1, resistance R2, resistance R3, resistance R4 and display driving interface terminal
D1, display driving interface terminal D2, display driving interface terminal D3 and display driving interface terminal D4 electrical connection, No. 5 signals are defeated
Terminal connects signal ground terminal, the input end grounding of signal ground terminal out;The both ends shunt-wound capacitance C1 of the resistance R1, resistance
The both ends shunt-wound capacitance C4 of the both ends shunt-wound capacitance C3 of the both ends shunt-wound capacitance C2 of R2, resistance R3, resistance R2;The resistance R1's
Input termination electrostatic protection element ESD1 ground connection, the input termination electrostatic protection element ESD2 ground connection of resistance R2, resistance R3's is defeated
Enter to terminate electrostatic protection element ESD3 ground connection, the input termination electrostatic protection element ESD4 ground connection of resistance R4.
Preferably, the LCD shows driving interface using 4,8, the different types such as VGA.
Preferably, the model ESD0402 series of the electrostatic protection element ESD1~electrostatic protection element ESD4.
Preferably, the transmission rate of the LCD display module is less than 20Mbps.
Preferably, the inductance size of the co-mode coil La and co-mode coil Lb is 1mH.
Compared with prior art, the beneficial effects of the utility model are as follows:
This LCD protects circuit, can avoid CMOS by electrostatic protection element ESD1~electrostatic protection element ESD4 of connection
Circuit plays a very good protection to component by electrostatic breakdown;Resistance R1 and capacitor C1, resistance R2 and capacitor C2, electricity
C4 constitutes filter circuit after hindering R3 and capacitor C3 and resistance R4 and capacitor, reduces the alternating component in the DC voltage of pulsation,
Retain its flip-flop, reduces the ripple coefficient of voltage of output, waveform becomes the vibration frequency for steadily avoiding electrostatic from generating
Signal impacts the work of component, and co-mode coil La and co-mode coil Lb beyond electrical boundaries or sink in external disturbance
When dust stratification dirt leads to electric leakage, it will released in the form of electric arc, to protect LCD mould group;Overall work is stablized, and protects to component
It is good to protect effect.
Detailed description of the invention
Fig. 1 is the protection circuit diagram of the utility model.
In figure: 1 mainboard MCU, 2LCD display module, 3 protection circuits.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1, a kind of LCD protects circuit, including mainboard MCU1, LCD display module 2 and protection circuit 3, mainboard
MCU1 is equipped with several signal output interfaces, and several signal output interfaces connect including No. 1 signal output interface, No. 2 signals outputs
Mouth, No. 3 signal output interfaces, No. 4 signal output interfaces and No. 5 signal output terminals, No. 1 signal output interface and No. 2 letters
Between number output interface and it is connected to co-mode coil La, between No. 3 signal output interfaces and No. 4 signal output interfaces and is connected to co-mode coil
The inductance size of Lb, co-mode coil La and co-mode coil Lb are 1mH;The transmission rate of LCD display module 2 is less than 20Mbps, can
It is used in the protective device less than 40pf, LCD display module 2 is equipped with LCD and shows driving interface, and LCD shows that driving interface is adopted
With 4,8, the different types such as VGA, LCD shows that driving interface includes display driving interface terminal D1, display driving interface end
Sub- D2, display driving interface terminal D3, display driving interface terminal D4 and signal ground terminal;Circuit 3 is protected to protect including electrostatic
Protection element ESD1~electrostatic protection element ESD4, resistance R1~resistance R4, capacitor C1~capacitor C4, wherein electrostatic protection element
ESD1~electrostatic protection element ESD4 model ESD0402 series, capacitor are respectively less than 40pf, suitable for LCD protection electricity
Road, No. 1 signal output interface, No. 2 signal output interfaces, No. 3 signal output interfaces and No. 4 signal output interfaces concatenate electricity respectively
Hinder R1, resistance R2, resistance R3, resistance R4 and display driving interface terminal D1, display driving interface terminal D2, display driving interface
Terminal D3 and display driving interface terminal D4 electrical connection, No. 5 signal output terminals connect signal ground terminal, signal ground terminal
Input end grounding;The both ends shunt-wound capacitance C2 of the both ends shunt-wound capacitance C1 of resistance R1, resistance R2, the both ends shunt-wound capacitance of resistance R3
The both ends shunt-wound capacitance C4 of C3, resistance R2;The input termination electrostatic protection element ESD1 ground connection of resistance R1, the input terminal of resistance R2
Connect electrostatic protection element ESD2 ground connection, the input termination electrostatic protection element ESD3 ground connection of resistance R3, the input termination of resistance R4
Electrostatic protection element ESD4 ground connection.
The LCD protects circuit, by terminating electrostatic protection element ESD1 ground connection in the input of resistance R1 respectively, resistance R2's
Input termination electrostatic protection element ESD2 ground connection, the input termination electrostatic protection element ESD3 ground connection of resistance R3, resistance R4's is defeated
Enter to terminate electrostatic protection element ESD4 ground connection, when due to electrostatic contact to electronic component or equipment, electrostatic will be by being connect
Touching object discharges over the ground, and discharge time is extremely short, and generated discharge current is very big, it is easy to component is damaged, and LCD shows mould
Control, driving circuit in group 2 are the cmos circuits of low pressure, micro energy lose, and easily by electrostatic breakdown, and LCD display module 2 makes
Used time often in contact with arrive electrostatic, by electrostatic protection element ESD1~electrostatic protection element ESD4 of connection avoid cmos circuit by
To electrostatic breakdown, play a very good protection to component;Resistance R1 and capacitor C1, resistance R2 and capacitor C2, resistance R3 and
Capacitor C3 and resistance R4 constitutes filter circuit with C4 after capacitor, reduces the alternating component in the DC voltage of pulsation, retains it
Flip-flop reduces the ripple coefficient of voltage of output, and waveform becomes the signal pair for the vibration frequency for steadily avoiding electrostatic from generating
The work of component impacts, by meeting co-mode coil La and co-mode coil Lb, when external disturbance exceed electrical boundaries, or
Deposition dust causes to leak electricity, it will is released in the form of electric arc, the length of electric arc is between 2.54mm+-0.5mm, to protect
LCD mould group.
In summary: this LCD protects circuit, and the control, driving circuit in LCD display module 2 are low pressure, micro energy lose
Cmos circuit, easily by electrostatic breakdown, and LCD display module 2 is protected when in use often in contact with electrostatic is arrived by the electrostatic of connection
Protection element ESD1~electrostatic protection element ESD4 avoids cmos circuit by electrostatic breakdown, plays protection well to component and makees
With;Resistance R1 constitutes filtered electrical with C4 after capacitor C1, resistance R2 and capacitor C2, resistance R3 and capacitor C3 and resistance R4 and capacitor
Road reduces the alternating component in the DC voltage of pulsation, retains its flip-flop, reduces the ripple coefficient of voltage of output, wave
The signal that deformation obtains the vibration frequency for steadily avoiding electrostatic from generating impacts the work of component;Co-mode coil La and altogether
Loft circle Lb is when external disturbance leads to electric leakage beyond electrical boundaries or deposition dust, it will it is released in the form of electric arc, from
And protect LCD mould group;Overall work is stablized, good to component protecting effect.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired
Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.
Claims (5)
1. a kind of LCD protects circuit, including mainboard MCU (1), LCD display module (2) and protection circuit (3), it is characterised in that:
The mainboard MCU (1) is equipped with several signal output interfaces, and several signal output interfaces include No. 1 signal output interface, No. 2
Signal output interface, No. 3 signal output interfaces, No. 4 signal output interfaces and No. 5 signal output terminals, No. 1 signal output connect
Between mouthful No. 2 signal output interfaces and it is connected to co-mode coil La, between No. 3 signal output interfaces and No. 4 signal output interfaces and is connect
There is co-mode coil Lb;The LCD display module (2) is equipped with LCD and shows driving interface, and LCD shows that driving interface includes display
Driving interface terminal D1, display driving interface terminal D2, display driving interface terminal D3, display driving interface terminal D4 and signal
Ground terminal;The protection circuit (3) includes electrostatic protection element ESD1~electrostatic protection element ESD4, resistance R1~resistance
R4, capacitor C1~capacitor C4, No. 1 signal output interface, No. 2 signal output interfaces, No. 3 signal output interfaces and No. 4 signals are defeated
Outgoing interface distinguishes series resistor R1, resistance R2, resistance R3, resistance R4 and display driving interface terminal D1, display driving interface end
Sub- D2, display driving interface terminal D3 and display driving interface terminal D4 electrical connection, No. 5 signal output terminals connect signal ground end
Son, the input end grounding of signal ground terminal;The both ends shunt-wound capacitance C1 of the resistance R1, the both ends shunt-wound capacitance of resistance R2
The both ends shunt-wound capacitance C4 of the both ends shunt-wound capacitance C3 of C2, resistance R3, resistance R2;The input of the resistance R1 terminates electrostatic protection
Element ESD1 ground connection, the input termination electrostatic protection element ESD2 ground connection of resistance R2, the input termination electrostatic protection member of resistance R3
Part ESD3 ground connection, the input termination electrostatic protection element ESD4 ground connection of resistance R4.
2. a kind of LCD according to claim 1 protects circuit, it is characterised in that: the LCD shows that driving interface uses 4
Position, 8, the different types such as VGA.
3. a kind of LCD according to claim 1 protects circuit, it is characterised in that: the electrostatic protection element ESD1~quiet
The model ESD0402 series of electric protection element ESD4.
4. a kind of LCD according to claim 1 protects circuit, it is characterised in that: the transmission of the LCD display module (2)
Rate is less than 20Mbps.
5. a kind of LCD according to claim 1 protects circuit, it is characterised in that: the co-mode coil La and co-mode coil
The inductance size of Lb is 1mH.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201820848119.8U CN208190249U (en) | 2018-06-01 | 2018-06-01 | A kind of LCD protection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201820848119.8U CN208190249U (en) | 2018-06-01 | 2018-06-01 | A kind of LCD protection circuit |
Publications (1)
Publication Number | Publication Date |
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CN208190249U true CN208190249U (en) | 2018-12-04 |
Family
ID=64429051
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN201820848119.8U Expired - Fee Related CN208190249U (en) | 2018-06-01 | 2018-06-01 | A kind of LCD protection circuit |
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CN (1) | CN208190249U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112272440A (en) * | 2020-10-10 | 2021-01-26 | 上海纯米电子科技有限公司 | Display screen anti-static interference circuit and display device |
-
2018
- 2018-06-01 CN CN201820848119.8U patent/CN208190249U/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112272440A (en) * | 2020-10-10 | 2021-01-26 | 上海纯米电子科技有限公司 | Display screen anti-static interference circuit and display device |
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GR01 | Patent grant | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181204 |
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CF01 | Termination of patent right due to non-payment of annual fee |