CN107256687B - Electrostatic protection circuit, driving method, electrostatic protection module and display device - Google Patents
Electrostatic protection circuit, driving method, electrostatic protection module and display device Download PDFInfo
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- CN107256687B CN107256687B CN201710600232.4A CN201710600232A CN107256687B CN 107256687 B CN107256687 B CN 107256687B CN 201710600232 A CN201710600232 A CN 201710600232A CN 107256687 B CN107256687 B CN 107256687B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0248—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection
- H01L27/0251—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices
- H01L27/0296—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices involving a specific disposition of the protective devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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- G09G2330/04—Display protection
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Abstract
The invention provides an electrostatic protection circuit, a driving method, an electrostatic protection module and a display device. The electrostatic protection circuit includes a first electrostatic protection unit; the first electrostatic protection unit comprises a first capacitor module, a first switch module, a second capacitor module and a second switch module, wherein the first end of the first capacitor module is connected with the first signal line; the control end of the first switch module is connected with the second end of the first capacitor module, the first end of the first switch module is connected with the first signal line, and the second end of the first switch module is connected with the first end of the second capacitor module; the control end of the second switch module is respectively connected with a first voltage line and the second end of the second capacitor module, the first end of the second switch module is connected with the first end of the second capacitor module, and the second end of the second switch module is connected with the second signal line. The invention can reduce ESD (electrostatic discharge) power consumption.
Description
Technical Field
The invention relates to the technical field of electrostatic protection, in particular to an electrostatic protection circuit, a driving method, an electrostatic protection module and a display device.
Background
Present intelligence wearing market is hot, and small-size dysmorphism product demand constantly promotes, and more ordinary demonstration class product dresses class product and puts forward new requirement to display panel, and the most important requirement reflects in the aspect of the consumption. The intelligent wearable product has limited volume, and the battery capacity cannot be improved at one time, so that the power consumption of the display panel is required to be minimized, even if partial display effect is sacrificed, the rich color and the ultra-low power consumption are contradictory, and the simultaneous realization cannot be realized temporarily. However, in implementing an extremely low power consumption scheme, the conventional design concept begins to expose some problems, such as ESD (Electro-Static discharge) original design, under which the ESD power consumption is increased in proportion to the overall power consumption, and a new design concept is required to reduce the ESD power consumption.
Disclosure of Invention
The invention mainly aims to provide an electrostatic protection circuit, a driving method, an electrostatic protection module and a display device, and solves the problem of ESD power consumption caused by leakage current between a first signal line and a second signal line in the prior art.
In order to achieve the above object, the present invention provides an electrostatic protection circuit connected between a first signal line and a second signal line, the electrostatic protection circuit including a first electrostatic protection unit;
the first electrostatic protection unit comprises a first capacitor module, a first switch module, a second capacitor module and a second switch module, wherein,
the first end of the first capacitor module is connected with the first signal wire;
the control end of the first switch module is connected with the second end of the first capacitor module, the first end of the first switch module is connected with the first signal line, and the second end of the first switch module is connected with the first end of the second capacitor module;
a control end of the second switch module is connected with a first voltage line and a second end of the second capacitor module respectively, a first end of the second switch module is connected with a first end of the second capacitor module, and a second end of the second switch module is connected with the second signal line;
the first switch module is used for controlling the connection between the first signal line and the first end of the second capacitor module to be switched on or off under the control of the control end of the first switch module;
the second switch module is used for controlling the connection between the first end of the second capacitor module and the second signal line to be switched on or switched off under the control of the control end of the second switch module.
In practice, the first voltage line is configured to output a first voltage signal when no static electricity exists on the first signal line or the static electricity existing on the first signal line cannot break down the first capacitor module, so as to control the second switch module to disconnect the second end of the first switch module from the second signal line; the first voltage line is further configured to not output a signal when static electricity existing on the first signal line can break down the first capacitance module.
In practice, the electrostatic protection circuit further comprises a second electrostatic protection unit;
the second electrostatic protection unit comprises a third switch module, a fourth switch module, a third capacitor module and a fourth capacitor module, wherein,
the first end of the third capacitor module is connected with the second signal line;
a control end of the third switch module is connected with a second end of the third capacitor module, a first end of the third switch module is connected with the second signal line, and a second end of the third switch module is connected with a first end of the fourth capacitor module;
a control end of the fourth switch module is connected to a second voltage line and a second end of the fourth capacitor module, respectively, a first end of the fourth switch module is connected to a first end of the fourth capacitor module, and a second end of the fourth switch module is connected to the first signal line;
the third switching module is used for controlling connection between the second signal line and the first end of the fourth capacitance module to be switched on or off under the control of the control end of the third switching module;
and the fourth switching module is used for controlling the connection between the first end of the fourth capacitor module and the first signal line to be switched on or switched off under the control of the control end of the fourth switching module.
In an implementation, the second voltage line is configured to output a second voltage signal when no static electricity exists on the second signal line or the static electricity existing on the second signal line cannot break down the third capacitive module, so as to control the fourth switching module to disconnect the second end of the third switching module from the first signal line; the second voltage line is further configured to not output a signal when static electricity existing on the second signal line can break down the third capacitance module.
In practice, the first switch module comprises: a first switch transistor, a gate of which is connected to the second end of the first capacitor module, a first pole of which is connected to the first signal line, and a second pole of which is connected to the first end of the second capacitor module;
the second switch module includes: a second switch transistor, a gate of which is connected to the first voltage line and a second end of the second capacitor module, a first pole of which is connected to a first end of the second capacitor module, and a second pole of which is connected to the second signal line;
the third switching module includes: a gate of the third switching transistor is connected with a second end of the third capacitor module, a first pole of the third switching transistor is connected with the second signal line, and a second pole of the third switching transistor is connected with a first end of the fourth capacitor module;
the fourth switching module includes: and a gate of the fourth switching transistor is connected with the second voltage line and the second end of the fourth capacitor module respectively, a first pole of the fourth switching transistor is connected with the first end of the fourth capacitor module, and a second pole of the fourth switching transistor is connected with the first signal line.
In practice, the first signal line includes a data line, and the second signal line includes a common electrode line.
The present invention also provides a driving method of an electrostatic protection circuit, for driving the electrostatic protection circuit, the driving method of the electrostatic protection circuit includes:
when static electricity existing on a first signal line breaks through a first capacitor module, the first switch module controls and conducts connection between the first signal line and a first end of a second switch module under the control of a control end of the first switch module, the static electricity existing on the first signal line breaks through the second capacitor module through the first switch module, a first voltage line does not output signals, and the second switch module controls and conducts connection between a first end of the second capacitor module and a second signal line under the control of the control end of the second switch module;
when no static electricity exists on the first signal line or the static electricity existing on the first signal line cannot break down the first capacitance module, the first voltage line outputs a first voltage signal, and the second switch module controls to disconnect the connection between the second end of the first switch module and the second signal line under the control of the first voltage signal received by the control end of the second switch module.
In implementation, when the electrostatic protection circuit further includes a second electrostatic protection unit, and the second electrostatic protection unit includes a third switch module, a fourth switch module, a third capacitor module, and a fourth capacitor module, the driving method of the electrostatic protection circuit further includes:
when static electricity existing on the second signal line breaks through the third capacitance module, the third switch module controls and conducts connection between the second signal line and the first end of the fourth switch module under the control of the control end of the third switch module, the static electricity existing on the second signal line breaks through the fourth capacitance module through the third switch module, the second voltage line does not output signals, and the fourth switch module controls and conducts connection between the first end of the fourth capacitance module and the first signal line under the control of the control end of the fourth switch module;
when no static electricity exists on the second signal line or the static electricity existing on the second signal line cannot break down the third capacitance module, the second voltage line outputs a second voltage signal, and the fourth switch module controls to disconnect the second end of the third switch module from the first signal line under the control of the second voltage signal received by the control end of the fourth switch module.
The invention also provides an electrostatic protection module which is respectively connected with the second signal line and the plurality of first signal lines, wherein the electrostatic protection module comprises a plurality of electrostatic protection circuits;
the nth electrostatic protection circuit is respectively connected with the second signal wire and the nth first signal wire, and n is a positive integer.
The invention also provides a display device comprising the electrostatic protection circuit.
Compared with the prior art, the electrostatic protection circuit, the driving method, the electrostatic protection module and the display device control the first signal line and the second signal line not to be conducted when the display is normal (namely, the static electricity on the first signal line is not enough to break through the first capacitor module and the second capacitor module), so that the leakage current is avoided, and the ESD power consumption is reduced.
Drawings
Fig. 1 is a structural diagram of an electrostatic protection circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of an ESD protection circuit according to another embodiment of the present invention;
FIG. 3 is a circuit diagram of an embodiment of an ESD protection circuit according to the present invention;
fig. 4 is a structural diagram of an electrostatic protection module according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The transistors used in all embodiments of the present invention may be thin film transistors or field effect transistors or other devices having the same characteristics. In the embodiment of the present invention, in order to distinguish two poles of the transistor except for the gate, one of the two poles is referred to as a first pole, and the other pole is referred to as a second pole. In practical operation, the first pole may be a drain, and the second pole may be a source; alternatively, the first pole may be a source and the second pole may be a drain.
As shown in fig. 1, the esd protection circuit according to the embodiment of the present invention is connected between a first signal line S L1 and a second signal line S L2, and includes a first esd protection unit;
the first electrostatic protection unit comprises a first switch module 11, a second switch module 12, a first capacitor module 13 and a second capacitor module 14, wherein,
a first end of the first capacitance module 13 is connected to the first signal line S L1;
a control end of the first switch module 11 is connected to a second end of the first capacitor module 13, a first end of the first switch module 11 is connected to the first signal line S L1, and a second end of the first switch module 11 is connected to a first end of the second capacitor module 14;
the control terminal of the second switch module 12 is respectively connected to a first voltage line V L1 and a second terminal of the second capacitor module 14, the first terminal of the second switch module 12 is connected to the first terminal of the second capacitor module, and the second terminal of the second switch module 12 is connected to the second signal line S L2;
the first switch module 11 is used for controlling to switch on or off the connection between the first signal line S L1 and the first end of the second capacitor module 14 under the control of the control end of the first switch module;
the second switch module 12 is used for controlling to switch on or off the connection between the first end of the second capacitor module 14 and the second signal line S L2 under the control of the control end of the second switch module.
Compared with the prior art, the electrostatic protection circuit comprises a first electrostatic protection unit and a first capacitor module 13, a second capacitor module 14 and a second switch module 12 additionally arranged, wherein the second switch module 12 is used for controlling the first signal line S L1 and the second signal line S L2 to be not conducted during normal display (namely, when static electricity on the first signal line S L1 is not enough to break down the first capacitor module 13 and the second capacitor module 14), so that no leakage current is generated, and therefore power consumption of ESD (Electro-static discharge) is reduced, and the second capacitor module 14 is used for separating a control end of the second switch module 12 from the first signal line S L1 during normal display, and preventing the second switch module 12 from being conducted during normal display.
In actual operation, the first signal line S L1 may include, but is not limited to, a data line, and the second signal line S L2 may include, but is not limited to, a common electrode line.
Specifically, the first voltage line V L1 is configured to output a first voltage signal when no static electricity exists on the first signal line S L1 or the static electricity existing on the first signal line S L1 cannot break down the first capacitor module 13, so as to control the second switch module 12 to disconnect the second end of the first switch module 11 from the second signal line S L2, and the first voltage line V L1 is further configured to not output a signal when the static electricity existing on the first signal line S L1 can break down the first capacitor module 13.
In practical implementation, when the static electricity existing on the first signal line S L1 breaks down the first capacitor module 13 and the second capacitor module 14, the power management chip controls to stop supplying the signal to the first voltage line V L1, and at this time, the first switch module 11 and the second switch module 12 are both turned on, and the static electricity on the first signal line S L1 is discharged to the second signal line S L2, so that the static electricity discharge is completed while the ESD power consumption is reduced.
In practical operation, the capacitance values of the first capacitance module 13 and the second capacitance module 14 are smaller, and the capacitance values of the first capacitance module 13 and the second capacitance module 14 may be equal to the capacitance value of the first switch included in the first switch module 11The capacitance value of the parasitic capacitance of the transistor is in one order of magnitude. For example, the capacitance values of the first capacitance module 13 and the second capacitance module 14 may be fF (10)-15F) Magnitude.
Specifically, the first switch module may include: a first switch transistor, a gate of which is connected to the second end of the first capacitor module, a first pole of which is connected to the first signal line, and a second pole of which is connected to the first end of the second capacitor module;
the second switch may include: and a gate of the second switching transistor is connected with the first voltage line and the second end of the second capacitor module respectively, a first pole of the second switching transistor is connected with the first end of the second capacitor module, and a second pole of the second switching transistor is connected with the second signal line.
Specifically, the first capacitance module may include a first capacitance; the second capacitance module may include a second capacitance.
Preferably, as shown in fig. 2, on the basis of the embodiment of the electrostatic protection circuit shown in fig. 1, the electrostatic protection circuit according to the embodiment of the present invention may further include a second electrostatic protection unit;
the second electrostatic protection unit includes a third switching module 21, a fourth switching module 22, a third capacitance module 23, and a fourth capacitance module 24, wherein,
a first end of the third capacitive module 23 is connected to the second signal line S L2;
a control terminal of the third switching module 21 is connected to the second terminal of the third capacitor module 23, a first terminal of the third switching module 21 is connected to the second signal line S L2, and a second terminal of the third switching module 21 is connected to the first terminal of the fourth capacitor module 24;
a control end of the fourth switching module 22 is connected to a second voltage line V L2 and a second end of the fourth capacitance module 24, respectively, a first end of the fourth switching module 22 is connected to a first end of the fourth capacitance module 24, and a second end of the fourth switching module 22 is connected to the first signal line S L1;
the third switching module 21 is configured to control to turn on or off the connection between the second signal line S L2 and the first end of the fourth capacitive module 24 under the control of the control end thereof;
the fourth switch module 22 is used for controlling to switch on or off the connection between the first terminal of the fourth capacitor module 24 and the first signal line S L1 under the control of the control terminal of the fourth switch module.
Compared with the prior art, the electrostatic protection circuit according to the embodiment of the invention includes, in the second electrostatic protection unit, a third capacitor module 23, a fourth capacitor module 24, and a fourth switch module 22, where the fourth switch module 22 is configured to control the first signal line S L1 and the second signal line S L2 to be non-conductive when the static electricity on the second signal line S L2 is not enough to break down the third capacitor module 23 and the fourth capacitor module 24, so that there is no leakage current and ESD power consumption, and the fourth capacitor module 24 is configured to separate the control terminal of the fourth switch module 22 from the second signal line S L2 during normal display, so as to prevent the fourth switch module 22 from being conductive when the static electricity on the second signal line S L2 is not strong.
When the third and fourth capacitance modules 23 and 24 are broken down by the static electricity existing on the second signal line S L2, the power management chip controls to stop supplying the signal to the second voltage line V L2, and at this time, the third and fourth switching modules 21 and 22 are both turned on, and the static electricity on the second signal line S L2 is discharged to the first signal line S L1, thereby completing the static electricity discharge while reducing the ESD power consumption.
Specifically, the second voltage line V L is configured to output a second voltage signal when no static electricity exists on the second signal line S L or the static electricity existing on the second signal line S L2 cannot break down the third capacitive module 23, so as to control the fourth switching module 22 to disconnect the second end of the third switching module 21 from the first signal line S L1, and the second voltage line V L is further configured to output no signal when the static electricity existing on the second signal line S L can break down the third capacitive module 23.
In practice operateIn operation, the capacitance values of the third capacitance module 23 and the fourth capacitance module 24 are smaller, and the capacitance values of the third capacitance module 23 and the fourth capacitance module 24 may be in an order of magnitude with the capacitance value of the parasitic capacitance of the third switching transistor included in the third switching module 21. For example, the capacitance values of the third capacitive module 23 and the fourth capacitive module 24 may be fF (10)-15F) Magnitude.
Specifically, the third switching module may include: a gate of the third switching transistor is connected with a second end of the third capacitor module, a first pole of the third switching transistor is connected with the second signal line, and a second pole of the third switching transistor is connected with a first end of the fourth capacitor module;
the fourth switching module may include: and a gate of the fourth switching transistor is connected with the second voltage line and the second end of the fourth capacitor module respectively, a first pole of the fourth switching transistor is connected with the first end of the fourth capacitor module, and a second pole of the fourth switching transistor is connected with the first signal line.
The electrostatic protection circuit provided by the embodiment of the invention can be applied to the field of intelligent wearing, and the ESD power consumption is reduced by disconnecting the communication loop of the existing ESD (Electro-Static discharge) circuit without losing the electrostatic prevention capability of the ESD circuit. Compared with the existing ESD design, the electrostatic protection circuit provided by the embodiment of the invention can effectively reduce the current in the ESD circuit under the normal state, thereby reducing the power consumption.
The electrostatic protection circuit according to the present invention is described below with reference to an embodiment.
As shown in fig. 3, an embodiment of the electrostatic protection circuit according to the invention (in the embodiment, the first signal line is a Data line Data, and the second signal line is a common electrode line VcomB) includes a first electrostatic protection unit and a second electrostatic protection unit;
the first electrostatic protection unit includes a first capacitor C1, a first switching transistor M1, a second capacitor C2, and a second switching transistor M2, wherein,
a first end of the first capacitor C1 is connected with the Data line Data;
the gate of the first switch transistor M1 is connected to the second end of the first capacitor C1, the drain of the first switch transistor M1 is connected to the Data line Data, and the source of the first switch transistor M1 is connected to the first end of the second capacitor C2;
the gate of the second switch transistor M2 is connected to a first voltage line V L1 and a second end of the second capacitor C2, respectively, the drain of the second switch transistor M2 is connected to a first end of the second capacitor C2, and the source of the second switch transistor M2 is connected to the common electrode line VcomB;
the first voltage line V L1 outputs a low voltage signal to control the second switching transistor M2 to be disconnected to disconnect the source of the first switching transistor M1 from the common electrode line Vcomb when no static electricity exists on the Data line Data or the static electricity existing on the Data line Data cannot break down the first capacitor C1, the first voltage line V L1 is also used for not outputting a signal when the static electricity existing on the Data line Data can break down the first capacitor C1 (when the static electricity breakdown exists, the power management chip controls to stop supplying power to the first voltage line V L1);
the second electrostatic protection unit includes a third switching transistor M3, a fourth switching transistor M4, a third capacitor C3, and a fourth capacitor C4, wherein,
a first end of the third capacitor C3 is connected with the common electrode line VcomB;
the gate of the third switching transistor M3 is connected to the second end of the third capacitor C3, the drain of the third switching transistor M3 is connected to the common electrode line VcomB, and the source of the third switching transistor is connected to the first end of the fourth capacitor C4;
the gate of the fourth switching transistor M4 is connected to a second voltage line V L2 and a second end of the fourth capacitor C4, respectively, the drain of the fourth switching transistor M4 is connected to a first end of the fourth capacitor C4, and the source of the fourth switching transistor M4 is connected to the Data line Data;
when no static electricity exists on the common electrode line VcomB or the static electricity existing on the common electrode line VcomB cannot break down the third capacitor C3, the second voltage line V L2 outputs a low voltage signal to control the fourth switching transistor M4 to be turned off to disconnect the source of the third switching transistor M3 from the Data line Data, and when the static electricity existing on the common electrode line VcomB can break down the third capacitor C3, the second voltage line V L2 does not output a signal and when the static electricity breakdown exists, the power management chip controls to stop supplying power to the second voltage line V L2).
The specific embodiment of the present invention as shown in fig. 3 disconnects the Data line Data from the gate of the first switching transistor M1 through the first capacitor C1, connects the gate of the second switching transistor M2 to the first voltage line V L1, and the first voltage line V L1 outputs a low voltage when there is no electrostatic breakdown, so as to completely pull down the gate potential of M2, and prevent the power consumption from rising due to persistent current leakage, thereby solving the problem of power consumption of ESD in smart wearing.
Similarly, the embodiment of the present invention as shown in fig. 3 disconnects the common electrode line VcomB from the gate of the third switching transistor M3 through the third capacitor C3, and connects the gate of the fourth switching transistor M4 to the second voltage line V L2, and the second voltage line V L2 outputs a low voltage when there is no electrostatic breakdown, so as to pull down the gate potential of M4 completely, and prevent the power consumption from rising due to persistent current leakage, thereby solving the power consumption problem of ESD in smart wearing.
In practical operation, the first end of C3 may be directly connected to the common electrode line VcomB, or may be connected to the common electrode line VcomB through a short-circuit ring.
The embodiment of the electrostatic protection circuit of the invention shown in figure 3 is in operation,
when the display is normal (namely no static electricity exists on Data or the static electricity existing on the Data is not enough to break down C1), V L1 outputs low voltage, M1 is matched with M2 to break the connection between the Data and Vcomb and reduce the ESD power loss;
when large voltage static electricity comes on Data, C1 is broken down, M1 is opened, C2 is broken down, M2 is opened, the large voltage static electricity is guided to Vcomb, and the power management chip controls to stop providing signals to V L1 at the moment;
when static electricity does not exist on Vcomb or the static electricity on the Vcomb is not enough to break down C3, V L outputs low voltage, M3 is matched with M4 to disconnect the connection between the Vcomb and Data, and ESD power loss is reduced;
when large voltage static electricity arrives at Vcomb, C3 is broken down, M3 is opened, C4 is broken down, M4 is opened, and the large voltage static electricity is led to Data, at which time the power management chip control stops providing signals to V L2.
The driving method of the electrostatic protection circuit according to the embodiment of the present invention is used for driving the electrostatic protection circuit, and the driving method of the electrostatic protection circuit includes:
when static electricity existing on a first signal line breaks through a first capacitor module, the first switch module controls and conducts connection between the first signal line and a first end of a second switch module under the control of a control end of the first switch module, the static electricity existing on the first signal line breaks through the second capacitor module through the first switch module, a first voltage line does not output signals, and the second switch module controls and conducts connection between a first end of the second capacitor module and a second signal line under the control of the control end of the second switch module;
when no static electricity exists on the first signal line or the static electricity existing on the first signal line cannot break down the first capacitance module, the first voltage line outputs a first voltage signal, and the second switch module controls to disconnect the connection between the second end of the first switch module and the second signal line under the control of the first voltage signal received by the control end of the second switch module.
Specifically, when the electrostatic protection circuit further includes a second electrostatic protection unit, and the second electrostatic protection unit includes a third switch module, a fourth switch module, a third capacitor module, and a fourth capacitor module, the driving method of the electrostatic protection circuit further includes:
when static electricity existing on the second signal line breaks through the third capacitance module, the third switch module controls and conducts connection between the second signal line and the first end of the fourth switch module under the control of the control end of the third switch module, the static electricity existing on the second signal line breaks through the fourth capacitance module through the third switch module, the second voltage line does not output signals, and the fourth switch module controls and conducts connection between the first end of the fourth capacitance module and the first signal line under the control of the control end of the fourth switch module;
when no static electricity exists on the second signal line or the static electricity existing on the second signal line cannot break down the third capacitance module, the second voltage line outputs a second voltage signal, and the fourth switch module controls to disconnect the second end of the third switch module from the first signal line under the control of the second voltage signal received by the control end of the fourth switch module.
The electrostatic protection module is respectively connected with the second signal line and the plurality of first signal lines, and comprises a plurality of electrostatic protection circuits;
the nth electrostatic protection circuit is respectively connected with the second signal wire and the nth first signal wire, and n is a positive integer.
As shown in fig. 4, the esd protection module according to the embodiment of the invention includes a first esd protection circuit ESDU1, a second esd protection circuit ESDU2, and a third esd protection circuit ESDU3 as an example for explanation;
the first electrostatic protection circuit ESDU1 is respectively connected to the first voltage line V L1, the second voltage line V L2, the common electrode line VcomB, and the first Data line Data 1;
the second electrostatic protection circuit ESDU2 is respectively connected to the first voltage line V L1, the second voltage line V L2, the common electrode line VcomB, and the second Data line Data 2;
the third electrostatic protection circuit ESDU3 is connected to the first voltage line V L1, the second voltage line V L2, the common electrode line VcomB, and the third Data line Data3, respectively.
The display device provided by the embodiment of the invention comprises the electrostatic protection circuit.
The display device according to the embodiment of the present invention may include a liquid crystal display device, such as a liquid crystal panel, a liquid crystal television, a mobile phone, and a liquid crystal display. In addition to liquid crystal display devices, embodiments of the present invention may also include organic light emitting displays or other types of display devices, such as e-readers and the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An electrostatic protection circuit is connected between a first signal line and a second signal line, and is characterized by comprising a first electrostatic protection unit;
the first electrostatic protection unit comprises a first capacitor module, a first switch module, a second capacitor module and a second switch module, wherein,
the first end of the first capacitor module is connected with the first signal wire;
the control end of the first switch module is connected with the second end of the first capacitor module, the first end of the first switch module is connected with the first signal line, and the second end of the first switch module is connected with the first end of the second capacitor module;
a control end of the second switch module is connected with a first voltage line and a second end of the second capacitor module respectively, a first end of the second switch module is connected with a first end of the second capacitor module, and a second end of the second switch module is connected with the second signal line;
the first switch module is used for controlling the connection between the first signal line and the first end of the second capacitor module to be switched on or off under the control of the control end of the first switch module;
the second switch module is used for controlling the connection between the first end of the second capacitor module and the second signal line to be switched on or switched off under the control of the control end of the second switch module.
2. The electrostatic protection circuit according to claim 1, wherein the first voltage line is configured to output a first voltage signal to control the second switching module to disconnect the second terminal of the first switching module from the second signal line when no static electricity exists on the first signal line or the static electricity existing on the first signal line cannot break down the first capacitance module; the first voltage line is further configured to not output a signal when static electricity existing on the first signal line can break down the first capacitance module.
3. The electrostatic protection circuit according to claim 2, further comprising a second electrostatic protection unit;
the second electrostatic protection unit comprises a third switch module, a fourth switch module, a third capacitor module and a fourth capacitor module, wherein,
the first end of the third capacitor module is connected with the second signal line;
a control end of the third switch module is connected with a second end of the third capacitor module, a first end of the third switch module is connected with the second signal line, and a second end of the third switch module is connected with a first end of the fourth capacitor module;
a control end of the fourth switch module is connected to a second voltage line and a second end of the fourth capacitor module, respectively, a first end of the fourth switch module is connected to a first end of the fourth capacitor module, and a second end of the fourth switch module is connected to the first signal line;
the third switching module is used for controlling connection between the second signal line and the first end of the fourth capacitance module to be switched on or off under the control of the control end of the third switching module;
and the fourth switching module is used for controlling the connection between the first end of the fourth capacitor module and the first signal line to be switched on or switched off under the control of the control end of the fourth switching module.
4. The electrostatic protection circuit of claim 3, wherein the second voltage line is to output a second voltage signal to control the fourth switching module to disconnect the second terminal of the third switching module from the first signal line when no static electricity exists on the second signal line or the static electricity existing on the second signal line cannot break down the third capacitive module; the second voltage line is further configured to not output a signal when static electricity existing on the second signal line can break down the third capacitance module.
5. The electrostatic protection circuit of claim 4, wherein the first switching module comprises: a first switch transistor, a gate of which is connected to the second end of the first capacitor module, a first pole of which is connected to the first signal line, and a second pole of which is connected to the first end of the second capacitor module;
the second switch module includes: a second switch transistor, a gate of which is connected to the first voltage line and a second end of the second capacitor module, a first pole of which is connected to a first end of the second capacitor module, and a second pole of which is connected to the second signal line;
the third switching module includes: a gate of the third switching transistor is connected with a second end of the third capacitor module, a first pole of the third switching transistor is connected with the second signal line, and a second pole of the third switching transistor is connected with a first end of the fourth capacitor module;
the fourth switching module includes: and a gate of the fourth switching transistor is connected with the second voltage line and the second end of the fourth capacitor module respectively, a first pole of the fourth switching transistor is connected with the first end of the fourth capacitor module, and a second pole of the fourth switching transistor is connected with the first signal line.
6. The electrostatic protection circuit according to any one of claims 1 to 5, wherein the first signal line includes a data line, and the second signal line includes a common electrode line.
7. A driving method of an electrostatic protection circuit for driving the electrostatic protection circuit according to any one of claims 1 to 6, the driving method comprising:
when static electricity existing on a first signal line breaks through a first capacitor module, the first switch module controls and conducts connection between the first signal line and a first end of a second switch module under the control of a control end of the first switch module, the static electricity existing on the first signal line breaks through the second capacitor module through the first switch module, a first voltage line does not output signals, and the second switch module controls and conducts connection between a first end of the second capacitor module and a second signal line under the control of the control end of the second switch module;
when no static electricity exists on the first signal line or the static electricity existing on the first signal line cannot break down the first capacitance module, the first voltage line outputs a first voltage signal, and the second switch module controls to disconnect the connection between the second end of the first switch module and the second signal line under the control of the first voltage signal received by the control end of the second switch module.
8. The driving method of an electrostatic protection circuit according to claim 7, wherein when the electrostatic protection circuit further includes a second electrostatic protection unit including a third switching module, a fourth switching module, a third capacitance module, and a fourth capacitance module, the driving method of an electrostatic protection circuit further includes:
when static electricity existing on the second signal line breaks through the third capacitance module, the third switch module controls and conducts connection between the second signal line and the first end of the fourth switch module under the control of the control end of the third switch module, the static electricity existing on the second signal line breaks through the fourth capacitance module through the third switch module, the second voltage line does not output signals, and the fourth switch module controls and conducts connection between the first end of the fourth capacitance module and the first signal line under the control of the control end of the fourth switch module;
when no static electricity exists on the second signal line or the static electricity existing on the second signal line cannot break down the third capacitance module, the second voltage line outputs a second voltage signal, and the fourth switch module controls to disconnect the second end of the third switch module from the first signal line under the control of the second voltage signal received by the control end of the fourth switch module.
9. An electrostatic protection module, which is connected to a second signal line and a plurality of first signal lines, respectively, wherein the electrostatic protection module comprises a plurality of electrostatic protection circuits according to any one of claims 1 to 6;
the nth electrostatic protection circuit is respectively connected with the second signal wire and the nth first signal wire, and n is a positive integer.
10. A display device comprising the electrostatic protection module of claim 9.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102655145A (en) * | 2012-01-12 | 2012-09-05 | 京东方科技集团股份有限公司 | Static releasing protection circuit and working method thereof |
| CN104112426A (en) * | 2014-06-30 | 2014-10-22 | 上海天马有机发光显示技术有限公司 | OLED pixel drive circuit, electrostatic discharge protection circuit and detection method |
| CN205899212U (en) * | 2016-07-21 | 2017-01-18 | 京东方科技集团股份有限公司 | Electrostatic protection unit, display panel and display device |
| CN106611762A (en) * | 2017-01-11 | 2017-05-03 | 京东方科技集团股份有限公司 | Electro-static protection circuit and method and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI358872B (en) * | 2008-01-09 | 2012-02-21 | Chunghwa Picture Tubes Ltd | Two-way electrostatic discharge protection circuit |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102655145A (en) * | 2012-01-12 | 2012-09-05 | 京东方科技集团股份有限公司 | Static releasing protection circuit and working method thereof |
| CN104112426A (en) * | 2014-06-30 | 2014-10-22 | 上海天马有机发光显示技术有限公司 | OLED pixel drive circuit, electrostatic discharge protection circuit and detection method |
| CN205899212U (en) * | 2016-07-21 | 2017-01-18 | 京东方科技集团股份有限公司 | Electrostatic protection unit, display panel and display device |
| CN106611762A (en) * | 2017-01-11 | 2017-05-03 | 京东方科技集团股份有限公司 | Electro-static protection circuit and method and display device |
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