CN111413818B - Liquid crystal display module capable of resisting electrical interference - Google Patents

Liquid crystal display module capable of resisting electrical interference Download PDF

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Publication number
CN111413818B
CN111413818B CN202010241677.XA CN202010241677A CN111413818B CN 111413818 B CN111413818 B CN 111413818B CN 202010241677 A CN202010241677 A CN 202010241677A CN 111413818 B CN111413818 B CN 111413818B
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Prior art keywords
liquid crystal
crystal display
display module
parallel
circuit
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CN202010241677.XA
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CN111413818A (en
Inventor
韩永刚
龚兆业
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Varitronix Heyuan Display Technology Co Ltd
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Varitronix Heyuan Display Technology Co Ltd
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    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362Active matrix addressed cells
    • G02F1/136286Wiring, e.g. gate line, drain line
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362Active matrix addressed cells
    • G02F1/136286Wiring, e.g. gate line, drain line
    • G02F1/136295Materials; Compositions; Manufacture processes
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00Materials and properties
    • G02F2202/22Antistatic materials or arrangements

Abstract

The invention discloses a liquid crystal display module resisting electrical interference, which comprises two layers of ITO (indium tin oxide) surface glass substrates, wherein a conductive material is arranged on the surface of each ITO surface glass substrate and is conducted with a ground wire; and a TVS tube array and a filter device are connected between a power line and a ground line of the liquid crystal display module in parallel. The TVS tube array is added to treat the condition that static electricity is led into a circuit, when the static electricity is led in from a liquid crystal display module port, the static electricity can invade an equipment circuit to generate higher static spike to cause damage of a circuit device, after the TVS tube array is added, the static spike can form instant earth discharge when flowing through the TVS, the static spike can be effectively clamped at required voltage, and the static electricity is prevented from flowing into a post circuit to damage the device.

Description

Liquid crystal display module capable of resisting electrical interference
Technical Field
The invention relates to a liquid crystal display module, in particular to a liquid crystal display module resisting electric interference.
Background
Liquid crystal display modules are becoming more and more popular in today's society and are used in various fields: as an important part of human-computer interaction, the performance of products is more and more required, and the safety of the products is the most important factor while providing convenience for the life of people in various industries such as airplanes, automobiles, industrial control, consumer goods and the like. As factors such as human body static electricity, equipment static electricity, air static electricity and the like which may appear everywhere in production and life, the performance of the product can be influenced at any time, the liquid crystal display is not displayed or is disordered, and even the liquid crystal display can be damaged in serious conditions, so that certain trouble or wrong judgment is caused to an operator, the performance of the whole product is influenced, and even larger potential safety hazards are caused. Therefore, the issue of electrostatic interference must be addressed, electrostatic discharge (ESD) and electrical fast transient burst (EFT) interference being the two most common types of electrostatic interference.
The electric fast transient pulse burst (EFT) interference is generated when an inductive load is disconnected in a circuit, and the electric fast transient pulse burst (EFT) interference is generated due to unstable equipment power supply, shaking of a switching device and change of a surrounding electromagnetic field, so that the display of the liquid crystal display is disordered or has no display, even the damage of electronic devices in the liquid crystal display causes potential safety hazards, so the design of resisting the electric fast transient pulse burst (EFT) interference is also important, and the stability of a liquid crystal display product can be improved.
The impact of electrical fast transient fast pulse trains (EFTs) on equipment is of three kinds: the first is to enter the device power supply directly through the power line, resulting in excessive noise voltage on the power line of the circuit; the second is that interference energy radiates to the space in the process of conducting on the power line, and the radiation energy induces adjacent signals to form interference; and the third is that the interference pulse signal directly enters the equipment circuit through the signal wire, so that interference is generated on the circuit.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention is directed to a liquid crystal display module capable of resisting electrical interference, which can effectively clamp the electrostatic voltage spike below the required voltage, and prevent the damage of the device caused by the electrostatic inflow in the post-circuit of the liquid crystal display module.
In order to achieve the purpose, the invention adopts the following technical scheme:
a liquid crystal display module resisting electrical interference comprises two layers of ITO (indium tin oxide) surface glass substrates, wherein conductive materials are arranged on the surfaces of the surface glass substrates and are conducted with a ground wire; and a TVS tube array and a filter device are added among a power line, a signal line and a ground line of the liquid crystal display module.
Further, the filtering device is a common-mode inductor and a differential-mode capacitor, and the common-mode inductor and the differential-mode capacitor are respectively connected in parallel between the power line and the ground line.
Furthermore, ferrite beads are added to the signal transmission line of the liquid crystal display module.
Further, the conductive material is an iron shell, the iron shell is in contact with the surface glass substrate, and the contact resistance of the iron shell and the surface glass substrate is as low as possible.
Further, the two groups of differential mode capacitors are respectively connected in parallel to two sides of the common mode inductor.
Further, a diode is connected in parallel between the power input and the ground wire, and the diode is connected in parallel to the left side of the differential mode capacitor.
Further, the TVC diode array is connected to the right side of the common mode inductor and the differential mode capacitor in parallel, the model of the TVC diode array is ESD-824015, a PIN1 PIN and a PIN6 PIN of the TVC diode array are connected in parallel between one group of signal lines, a PIN3 PIN and a PIN4 PIN are connected in parallel between the other group of signal lines, and a PIN2 PIN and a PIN5 PIN are connected in parallel between a power line and a ground line.
The invention has the beneficial effects that: the design of the invention can effectively clamp the electrostatic voltage spike below the required voltage, and prevent the damage of the device caused by the electrostatic inflow of the post circuit of the liquid crystal display module. After the iron shell is arranged on the surface glass substrate of the liquid crystal display module, the charges on the surface of the liquid crystal display module can be quickly conducted away through the iron shell and released through the power ground wire, so that the time of gathering the charges on the surface of the liquid crystal display module is shortened, and the charges can be released within 5 seconds.
The ferrite magnetic beads are added to a signal transmission line of the liquid crystal display module, and the common mode inductor or the differential mode inductor is added to a power supply input position to absorb interference of an electronic pulse group from the outside and absorb interference signals.
Drawings
FIG. 1 is a circuit diagram of a protection design of a liquid crystal module according to the present invention;
FIG. 2 is a wiring diagram of a protection design circuit of the liquid crystal module of the present invention.
FIG. 3 is a graph of static depletion after use of the present invention;
FIG. 4 is a flow diagram of static electricity in an embodiment;
FIG. 5 is a graph comparing electrostatic input and output in an embodiment.
Detailed Description
The invention will be further described with reference to the accompanying drawings and the detailed description below:
example one
As shown in fig. 1 and 2, an electric interference resistant lcd module includes two layers of ITO surface glass substrates, conductive materials are disposed on the surface of the ITO surface glass substrates, the conductive materials are conducted with a ground wire, the conductive materials are iron shells, the iron shells are in contact with the ITO surface glass substrates, and the resistance generated by the contact between the iron shells and the ITO surface glass substrates is as small as possible. The TVS diode array, the common mode inductor and the differential mode capacitor are connected in parallel between a power line and a ground line of the liquid crystal display module, and the common mode inductor and the differential mode capacitor are respectively connected in parallel between the power line and the ground line.
The static electricity discharge can generate a very high transient voltage, the speed is very high, the static electricity discharge can be completed within hundreds of millions of seconds, if the high voltage cannot be conducted away instantly, the liquid crystal display module can be damaged greatly, a TVS diode array is added among a power line, a signal line and a ground line of the liquid crystal display module, the situation can be processed when the static electricity is led into a liquid crystal display module circuit, when the static electricity is led from a power source or a signal line port of the liquid crystal display module, the liquid crystal display module circuit can be invaded by the static electricity, a higher static electricity peak is generated, devices in the liquid crystal display module circuit are damaged, after the TVS diode array is added, the static electricity peak flows through the TVS diode array, instant ground discharge can be formed, the static electricity voltage peak can be clamped below a required voltage effectively, and the damage of the device caused by the static electricity flowing into a rear circuit of the liquid crystal display, the circuit of the liquid crystal display module is designed for the existing circuit, and only a TVS diode array is added among a power line, a signal line and a ground line, wherein the model of the TVC diode array is ESD-824015.
As shown in the circuit 1 in fig. 4, when the external positive voltage electrostatic discharge enters from the S1, the external positive voltage electrostatic discharge firstly passes through the TVS diode array, and then only can flow through the PIN5 from the D1 due to the limitation of 4 unidirectional diodes in the TVS diode array, that is, the negative electrode of the TVS diode array, and then the TVS diode array between the PIN2 and the PIN5 plays a role in clamping the relative voltage between the signal and the ground wire within the specification; when the outside is negative-voltage static electricity discharged to S1, the voltage between GND and S1 is clamped at about 0.6V due to the action of D2, as shown by line 2 in fig. 4; as shown in fig. 5, when the front section has a positive voltage or a negative voltage input, a voltage clamp waveform outputted from the back end plays a role in protecting the back end circuit.
Example two
The difference from the first embodiment is that the filter device is a ferrite bead.
The surface glass substrate of the liquid crystal display module adopts the design of the existing double-layer ITO glass substrate, the iron shell is in good contact with the surface of the surface glass substrate, the iron shell is made of a better conductive material, the contact resistance generated when the iron shell is in contact with the surface glass substrate is smaller and better, then the iron shell is conducted with a power supply ground wire to form a discharge loop, after the outside discharges to the surface of the liquid crystal display module, the charges on the surface of the liquid crystal display module are converged together under normal conditions, no release way exists, so that an electric field is formed, the liquid crystal display module causes error display under the action of the electric field, after the iron shell is arranged, the charges on the surface of the liquid crystal display module can be rapidly conducted away through the iron shell, the release through the power supply ground wire is realized, the time of the charges gathered on the surface of the liquid crystal display module is shortened.
The ferrite magnetic beads are added to a signal transmission line of the liquid crystal display module, and the common mode inductor or the differential mode inductor is added to a power supply input position to absorb interference of an electronic pulse group from the outside and absorb interference signals.
The numbers in fig. 1 and 2 are the numbers of the different input and output ports, respectively.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.

Claims (2)

1. A liquid crystal display module resisting electrical interference is characterized in that a surface glass substrate of the liquid crystal display module is designed by adopting a double-layer ITO glass substrate, and is characterized in that a conductive material is arranged on the surface of the surface glass substrate and is conducted with a ground wire; a TVS diode array and a filtering device are connected in parallel among a power line, a signal line and a ground line of the liquid crystal display module, and ferrite beads are added to the signal line of the liquid crystal display module;
the filter device comprises a common-mode inductor and two groups of differential-mode capacitors, wherein the common-mode inductor and the two groups of differential-mode capacitors are respectively connected between a power line and a ground wire in parallel; the two groups of differential mode capacitors are respectively connected in parallel to two sides of the common mode inductor;
a diode is connected in parallel between the power supply input position and the ground wire, and the diode is connected in parallel on the left side of the filtering device;
the conductive material is an iron shell, and the iron shell is in contact with the surface glass substrate.
2. The liquid crystal display module of claim 1, wherein the TVS diode array is connected in parallel to the right side of the common mode inductor and the differential mode capacitor, the TVS diode array is ESD-824015, pins 1 and 6 of the TVS diode array are connected in parallel between one set of signal lines, pins 3 and 4 are connected in parallel between another set of signal lines, and pins 2 and 5 are connected in parallel between the power line and the ground line.
CN202010241677.XA 2020-03-31 2020-03-31 Liquid crystal display module capable of resisting electrical interference Active CN111413818B (en)

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