CN104578036B - A kind of electrostatic discharge protective circuit, electrostatic protection system and display device - Google Patents
A kind of electrostatic discharge protective circuit, electrostatic protection system and display device Download PDFInfo
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- CN104578036B CN104578036B CN201510041449.7A CN201510041449A CN104578036B CN 104578036 B CN104578036 B CN 104578036B CN 201510041449 A CN201510041449 A CN 201510041449A CN 104578036 B CN104578036 B CN 104578036B
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- 230000001681 protective effect Effects 0.000 title abstract 4
- 230000005611 electricity Effects 0.000 description 17
- 230000003068 static effect Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000012945 sealing adhesive Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012384 transportation and delivery Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention discloses a kind of electrostatic discharge protective circuit, electrostatic protection system and display device, electrostatic discharge protective circuit includes a resistance branch and a switching branches；Wherein, one end of resistance branch is used to connect the signal input part by electric module, and the other end of resistance branch is used for the signal output part for connecting power supply module；One end of switching branches is used for the signal output part for connecting power supply module, the other end ground connection of switching branches；When the voltage that the signal output part of power supply module exports is more than predeterminated voltage, switching branches conducting.In this way, power supply module to by electric module provide voltage during produce electrostatic when, the electrostatic discharge protective circuit can make electrostatic produce instant high-voltage be grounded by switching branches, so as to avoid electrostatic produce high voltage to being caused to damage by electric module.
Description
Technical Field
The present invention relates to the field of circuit technologies, and in particular, to an electrostatic protection circuit, an electrostatic protection system, and a display device.
Background
With the rapid development of science and technology, high and new industries such as electronics, communication, aerospace and the like rise rapidly, and particularly electronic products such as electronic instruments and equipment are increasingly miniaturized, multifunctional and intelligent. High density integrated circuits have become an indispensable device for the electronics industry in meeting the above-mentioned requirements. Such devices have been characterized by short line spacing, thin lines, high integration, fast operating speed, low power and high input impedance, thus rendering such devices increasingly sensitive to static electricity. Electrostatic discharge is a major cause of component breakdown damage and interference with the operation of electronic equipment. In the production of electronic products, the processes from the pretreatment of components, installation, welding, cleaning, to single-board testing, total testing, to packaging, storage, delivery, etc., may result in electrostatic discharge breakdown damage to the components. Therefore, electrostatic protection is becoming more and more important. Static electricity is a natural phenomenon that is almost impossible to produce, but it is possible to control its presence at dangerous levels so that its losses are minimized.
Disclosure of Invention
Embodiments of the present invention provide an electrostatic protection circuit, an electrostatic protection system and a display device, so as to prevent electrostatic damage to the circuit.
Therefore, an embodiment of the present invention provides an electrostatic protection circuit, which includes a resistor branch and a switch branch; wherein,
one end of the resistance branch is used for connecting a signal input end of the power receiving module, and the other end of the resistance branch is used for connecting a signal output end of the power supply module;
one end of the switch branch is used for being connected with a signal output end of the power supply module, and the other end of the switch branch is grounded;
and when the voltage output by the signal output end of the power supply module is greater than the preset voltage, the switch branch is conducted.
In a possible implementation manner, in the electrostatic protection circuit provided in an embodiment of the present invention, the resistor branch specifically includes a resistor having a resistance value of 100 Ω to 500 Ω.
In a possible implementation manner, in the electrostatic protection circuit provided by the embodiment of the invention, the switching branch specifically includes a switching transistor.
In a possible implementation manner, in the electrostatic protection circuit provided in an embodiment of the present invention, the switch transistor is an N-type transistor, and a turn-on voltage of the switch transistor is equal to the preset voltage;
and the grid electrode and the source electrode of the switch transistor are both used for being connected with the signal output end of the power supply module, and the drain electrode of the switch transistor is grounded.
Preferably, in the electrostatic protection circuit provided in the embodiment of the present invention, a response time of the switching transistor is less than 10 ms.
Accordingly, an embodiment of the present invention further provides an electrostatic protection system, including a power receiving module and a power supply module, where the power receiving module has at least one signal input end, and the power supply module has a signal output end corresponding to each signal input end, and further including: any of the above electrostatic protection circuits provided by embodiments of the present invention, connected between at least one of the signal input terminals and the corresponding signal output terminal.
Preferably, in the electrostatic protection system according to an embodiment of the present invention, one electrostatic protection circuit is connected between each of the signal input terminals and the corresponding signal output terminal.
Specifically, in the electrostatic protection system provided in the embodiment of the present invention, the preset voltage corresponding to the electrostatic protection circuit connected to each of the signal input terminals is greater than the maximum working voltage required by the corresponding signal input terminal.
Correspondingly, the embodiment of the invention also provides a display device which comprises any one of the electrostatic protection systems provided by the embodiment of the invention.
Specifically, in practical implementation, in the above display device provided in the embodiment of the present invention, the power receiving module is a gate driving circuit.
According to the electrostatic protection circuit, the electrostatic protection system and the display device provided by the embodiment of the invention, the electrostatic protection circuit comprises a resistance branch and a switch branch; one end of the resistance branch is used for connecting a signal input end of the power receiving module, and the other end of the resistance branch is used for connecting a signal output end of the power supply module; one end of the switch branch is used for connecting a signal output end of the power supply module, and the other end of the switch branch is grounded; when the voltage output by the signal output end of the power supply module is greater than the preset voltage, the switch branch circuit is conducted. Therefore, when static electricity is generated in the process of supplying voltage to the power receiving module by the power supply module, the static electricity protection circuit can enable instantaneous high voltage generated by the static electricity to be grounded through the switch branch circuit, and therefore the power receiving module is prevented from being damaged by the high voltage generated by the static electricity.
Drawings
Fig. 1 is a schematic structural diagram of an electrostatic protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electrostatic protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electrostatic protection system according to an embodiment of the present invention;
fig. 4 is a schematic partial structure diagram of a display device according to an embodiment of the present invention.
Detailed Description
Specific embodiments of an electrostatic protection circuit, an electrostatic protection system, and a display device according to embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The thicknesses and shapes of the various film layers in the drawings are not to be considered true proportions, but are merely intended to illustrate the present invention.
An electrostatic protection circuit 1 according to an embodiment of the present invention, as shown in fig. 1, includes a resistor branch 11 and a switch branch 12; wherein,
one end of the resistance branch 11 is used for connecting a signal Input end of the power receiving module 2, and the other end of the resistance branch 11 is used for connecting a signal Output end of the power supply module 3;
one end of the switch branch 12 is used for connecting a signal Output end Output of the power supply module 3, and the other end of the switch branch 12 is grounded;
when the voltage Output by the signal Output terminal Output of the power supply module 3 is greater than the preset voltage, the switch branch 12 is turned on.
The electrostatic protection circuit provided by the embodiment of the invention comprises a resistance branch circuit and a switch branch circuit; one end of the resistance branch is used for connecting a signal input end of the power receiving module, and the other end of the resistance branch is used for connecting a signal output end of the power supply module; one end of the switch branch is used for connecting a signal output end of the power supply module, and the other end of the switch branch is grounded; when the voltage output by the signal output end of the power supply module is greater than the preset voltage, the switch branch circuit is conducted. Therefore, when static electricity is generated in the process of supplying voltage to the power receiving module by the power supply module, the static electricity protection circuit can enable instantaneous high voltage generated by the static electricity to be grounded through the switch branch circuit, and therefore the power receiving module is prevented from being damaged by the high voltage generated by the static electricity.
Preferably, as shown in fig. 2, the resistor branch 11 of the electrostatic protection circuit provided in the embodiment of the present invention specifically includes a resistor R having a resistance value of 100 Ω -500 Ω, and certainly, a plurality of resistors connected in series and/or in parallel having a total resistance value of 100 Ω -500 Ω may also be used, which is not limited herein.
Preferably, as shown in fig. 2, the switch branch 12 of the electrostatic protection circuit provided in the embodiment of the present invention may specifically include a switch transistor M.
Further, in a specific implementation, in the electrostatic protection circuit provided in the embodiment of the present invention, as shown in fig. 2, the switch transistor M is an N-type transistor, and the turn-on voltage of the switch transistor M is equal to a predetermined voltage;
the gate and the source of the switching transistor M are both used for being connected with the signal Output end Output of the power supply module 3, and the drain of the switching transistor M is grounded.
The above is merely to illustrate the specific structure of the switching branch, and in the implementation, the specific structure of the switching branch is not limited to the above structure provided by the embodiment of the present invention, and may also be other structures known to those skilled in the art, and is not limited herein.
Specifically, in the implementation, the value of the preset voltage generally relates to the magnitude of the normal operating voltage of the powered module, and the preset voltage is at least greater than the maximum voltage of the normal operating voltage of the powered module to ensure that the powered module can operate normally.
In practical implementation, in the above electrostatic protection circuit provided in the embodiment of the present invention, in order to effectively avoid the influence of static electricity on the power receiving module, the response time of the switching transistor should be fast. Therefore, in a preferred implementation, the response time of the switching transistor should be less than 10 ms.
It should be noted that the switching Transistor mentioned in the above embodiments of the present invention may be a Thin Film Transistor (TFT) or a Metal oxide semiconductor field effect Transistor (MOS), and is not limited herein. In specific implementation, the source and drain of these switching transistors may be interchanged according to the transistor type and the input signal, and their functions are not specifically distinguished here.
Based on the same inventive concept, an electrostatic protection system according to an embodiment of the present invention is further provided, as shown in fig. 3, including a power receiving module 2 and a power supplying module 3, where the power receiving module 2 has at least one signal Input terminal (Input1, Input2 …, n in fig. 3 is equal to the number of the signal Input terminals, n is a positive integer, the power supplying module 3 has signal Output terminals (Output1, Output2, …, Output n) corresponding to the signal Input terminals (Input1, Input2, …, Input), and further includes any one of the electrostatic protection circuits 1 provided in the embodiments of the present invention connected between the at least one signal Input terminal and the corresponding signal Output terminal.
Preferably, in a specific implementation, in the electrostatic protection system provided in the embodiment of the present invention, an electrostatic protection circuit is connected between all signal input terminals of the power receiving module and the corresponding signal output terminals.
In specific implementation, the value of the preset voltage of the esd protection circuit connected to each signal input terminal is generally related to the magnitude of the voltage received by the signal input terminal when the powered module is in normal operation, and the preset voltage is at least greater than the maximum voltage received by the signal input terminal when the powered module is in normal operation to ensure that the powered module can operate normally. Therefore, the preset voltage corresponding to the electrostatic protection circuit connected with each signal input end is larger than the maximum working voltage required by the corresponding signal input end.
Based on the same inventive concept, embodiments of the present invention further provide a display device, including the electrostatic protection system provided in embodiments of the present invention, and since the principle of the display device to solve the problem is similar to that of the electrostatic protection system, the implementation of the display device may refer to the implementation of the electrostatic protection system, and repeated details are omitted.
In a specific implementation, the display device may be a liquid crystal display device, an organic electroluminescent display device, or the like, and is not limited herein.
Specifically, when the display device is a liquid crystal display device or an organic electroluminescent display device, the gate driving circuit is located outside the frame sealing adhesive, and is a circuit which is most prone to generate an electrostatic discharge (ESD) problem in the display device. Therefore, in the display device provided in the embodiment of the present invention, as shown in fig. 4, the power receiving module 2 is a gate driving circuit. In this way, the electrostatic protection circuit is connected to one or more signal input ends of the gate driving circuit, so that the electrostatic problem of the gate driving circuit is prevented.
Specifically, in implementation, the gate driving circuit generally includes a plurality of shift registers connected in series as shown in fig. 4: SR (1), SR (2), … SR (N), … SR (N-1) and SR (N) (N shift registers are arranged, N is more than or equal to 1 and less than or equal to N); except the first stage of shift register SR (1), the signal output end Out _ N (N is more than or equal to 1 and less than or equal to N) of each stage of shift register SR (N) inputs a Reset signal Reset to the adjacent previous stage of shift register SR (N-1) respectively; except the last stage of shift register SR (N), the signal output end Out _ N (N is more than or equal to 1 and less than or equal to N) of each stage of shift register SR (N) inputs an input signal In to the next stage of shift register SR (N +1) adjacent to the signal output end Out _ N; the Input signal In of the first stage shift register SR (1) is Input from the frame start signal Input terminal STV _ Input. In the gate driving circuit, the frame start signal, the first clock signal CLK and the second clock signal CLKB are generally provided by the power supply module 3, so that the frame start signal Input STV _ Input, the first clock signal Input CLK _ Input and the second clock signal Input CLKB _ Input of the gate driving circuit are generally prone to electrostatic problems. Therefore, in a specific implementation, as shown in fig. 4, the electrostatic protection circuit 1 is connected between the frame start signal Input terminal STV _ Input, the first clock signal Input terminal CLK _ Input, the second clock signal Input terminal CLKB _ Input, and the corresponding signal Output terminal Output of the power supply module 3 of the gate driving circuit. In the implementation, the gate driving circuit may have other signal input terminals, and in order to completely avoid the static electricity problem, it is preferable to connect a static electricity protection circuit to all the signal input terminals of the gate driving circuit connected to the power supply module.
Further, in the display device provided by the embodiment of the present invention, when the gate driving circuit includes a thin film transistor, it is to be ensured that the response time of the switching transistor in the electrostatic protection circuit is shorter than the response time of the thin film transistor in the gate driving circuit.
The display device provided by the embodiment of the invention can be as follows: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
The embodiment of the invention provides an electrostatic protection circuit, an electrostatic protection system and a display device, wherein the electrostatic protection circuit comprises a resistance branch and a switch branch; one end of the resistance branch is used for connecting a signal input end of the power receiving module, and the other end of the resistance branch is used for connecting a signal output end of the power supply module; one end of the switch branch is used for connecting a signal output end of the power supply module, and the other end of the switch branch is grounded; when the voltage output by the signal output end of the power supply module is greater than the preset voltage, the switch branch circuit is conducted. Therefore, when static electricity is generated in the process of supplying voltage to the power receiving module by the power supply module, the static electricity protection circuit can enable instantaneous high voltage generated by the static electricity to be grounded through the switch branch circuit, and therefore the power receiving module is prevented from being damaged by the high voltage generated by the static electricity.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. An electrostatic protection circuit is characterized by comprising a resistance branch and a switch branch; wherein,
one end of the resistance branch is used for connecting a signal input end of the power receiving module, and the other end of the resistance branch is used for connecting a signal output end of the power supply module;
one end of the switch branch is used for being connected with a signal output end of the power supply module, and the other end of the switch branch is grounded;
when the voltage output by the signal output end of the power supply module is greater than a preset voltage, the switch branch is conducted;
the switch branch specifically comprises a switch transistor;
the switch transistor is an N-type transistor, and the starting voltage of the switch transistor is equal to the preset voltage; the grid electrode and the source electrode of the switch transistor are both used for being connected with the signal output end of the power supply module, and the drain electrode of the switch transistor is grounded;
the response time of the switching transistor is less than 10 ms;
the resistance branch circuit specifically comprises a resistance with the resistance value of 100-500 omega.
2. An electrostatic protection system, includes receiving power module and power module, receiving power module has at least one signal input end, power module has with each signal output end that signal input end corresponds, its characterized in that still includes: an electrostatic protection circuit as claimed in claim 1 connected between at least one of the signal inputs and a corresponding signal output.
3. The electrostatic protection system of claim 2, wherein one of said electrostatic protection circuits is connected between all of said signal inputs and corresponding signal outputs.
4. The esd protection system of claim 3, wherein the predetermined voltage corresponding to the esd protection circuit connected to each of the signal input terminals is greater than the maximum operating voltage required by the corresponding signal input terminal.
5. A display device comprising an electrostatic protection system as claimed in claim 3 or 4.
6. The display device according to claim 5, wherein the power receiving module is a gate driving circuit.
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| CN201510041449.7A CN104578036B (en) | 2015-01-27 | 2015-01-27 | A kind of electrostatic discharge protective circuit, electrostatic protection system and display device |
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| CN201510041449.7A CN104578036B (en) | 2015-01-27 | 2015-01-27 | A kind of electrostatic discharge protective circuit, electrostatic protection system and display device |
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| CN104578036A CN104578036A (en) | 2015-04-29 |
| CN104578036B true CN104578036B (en) | 2018-05-01 |
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| CN103199513A (en) * | 2013-02-22 | 2013-07-10 | 合肥京东方光电科技有限公司 | Static electricity protection circuit, display device and static electricity protective method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100800152B1 (en) * | 2006-06-30 | 2008-02-01 | 주식회사 하이닉스반도체 | Electrostatic discharge protection circuit |
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2015
- 2015-01-27 CN CN201510041449.7A patent/CN104578036B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101211910A (en) * | 2006-12-29 | 2008-07-02 | 东部高科股份有限公司 | Device for protecting semiconductor ic |
| CN101339941A (en) * | 2008-05-08 | 2009-01-07 | 北京中星微电子有限公司 | Electrostatic discharging protection circuit |
| CN201562956U (en) * | 2009-10-29 | 2010-08-25 | 比亚迪股份有限公司 | Static protective circuit and integrative circuit |
| CN101697412A (en) * | 2009-10-30 | 2010-04-21 | 智原科技股份有限公司 | Static discharge protective circuit with electron overvoltage protective capability |
| CN102651547A (en) * | 2012-01-12 | 2012-08-29 | 京东方科技集团股份有限公司 | ESD (Electro-Static discharge) protection circuit and display device comprising same |
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