CN116704964A - Electrical overstress protection circuit, display panel and display device - Google Patents
Electrical overstress protection circuit, display panel and display device Download PDFInfo
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- CN116704964A CN116704964A CN202210184048.7A CN202210184048A CN116704964A CN 116704964 A CN116704964 A CN 116704964A CN 202210184048 A CN202210184048 A CN 202210184048A CN 116704964 A CN116704964 A CN 116704964A
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- 230000002457 bidirectional effect Effects 0.000 claims abstract description 175
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Classifications
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
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Abstract
The embodiment of the invention discloses an electric overstress protection circuit, a display panel and a display device, and the electric overstress protection circuit disclosed by the embodiment of the invention comprises: the first bidirectional protection sub-circuit comprises a first bidirectional protection unit and a second bidirectional protection unit, the first bidirectional protection unit comprises a first end and a second end which are opposite, the second bidirectional protection unit comprises a third end and a fourth end which are opposite, and the first end and the third end are respectively used for electrically connecting two signal lines in a first pair of bidirectional signal lines of the GOA driving circuit; the second end is electrically connected with the fourth end; the first unidirectional conduction unit comprises a first positive end and a first negative end which are opposite, the first positive end is electrically connected with the second end and the fourth end, the first negative end is grounded, and the first unidirectional conduction unit is used for limiting current to flow from the first positive end to the first negative end. The electrical overstress protection circuit disclosed by the embodiment of the invention has the effect of preventing EOS from entering a damaged circuit from GND.
Description
Technical Field
The present invention relates to the field of electronic technologies, and in particular, to an electrical overstress protection circuit, a display panel, and a display device.
Background
The GOA (Gate Drive On Array) technology is to use the original manufacturing process of the liquid crystal display panel to manufacture the driving circuit of the horizontal scanning line on the substrate around the display area, so that the driving circuit can replace the external IC (Integrated Circuit) to finish the driving of the horizontal scanning line, the GOA technology can reduce the binding procedure of the external IC, improve the productivity and reduce the product cost, and the liquid crystal display panel can be more suitable for manufacturing narrow-frame or frame-free display products. Since ESD (Electro-Static discharge) is liable to cause failure of LSIC (Large Scale Integrated Chip, large-scale integrated chip) and cause different drawings, it is generally necessary to add an electrostatic protection circuit in the GOA line to protect the LSIC, but the existing protection design has obvious effect on ESD protection only, but insufficient protection on EOS (Electrical Over Stress ), which causes damage to the electrostatic protection circuit and affects panel display.
Therefore, it is desirable to provide a new EOS protection circuit for better protection.
Disclosure of Invention
Therefore, in order to overcome at least part of the defects in the prior art, the embodiment of the invention provides an electrical overstress protection circuit which can effectively prevent EOS from entering from GND (Ground), and has strong EOS protection capability and simple structure.
Specifically, in one aspect, one embodiment of the present invention provides an electrical overstress protection circuit comprising: a first bidirectional protection sub-circuit comprising a first bidirectional protection unit and a second bidirectional protection unit, wherein the first bidirectional protection unit comprises a first end and a second end which are opposite, the second bidirectional protection unit comprises a third end and a fourth end which are opposite, and the first end and the third end are respectively used for electrically connecting two signal lines in a first pair of bidirectional signal lines of the GOA driving circuit; the second end and the fourth end are electrically connected; the first unidirectional conduction unit comprises a first positive end and a first negative end which are opposite, the first positive end is electrically connected with the second end and the fourth end, the first negative end is grounded, and the first unidirectional conduction unit is used for limiting current to flow from the first positive end to the first negative end.
In one embodiment, the first bidirectional protection unit and the second bidirectional protection unit comprise TVS tube devices, the first unidirectional conducting unit is a diode, the first positive terminal is the positive terminal of the diode, and the first negative terminal is the negative terminal of the diode.
In one embodiment, the first bidirectional protection unit includes a first bidirectional TVS tube having two ends, the first end and the second end of the first bidirectional protection unit, respectively.
In one embodiment, the first bidirectional protection unit includes a first unidirectional TVS tube and a second unidirectional TVS tube, the anodes of which are connected, and the cathodes of the first unidirectional TVS tube and the second unidirectional TVS tube are the first end and the second end of the first bidirectional protection unit, respectively.
In one embodiment, the second bidirectional protection unit includes a second bidirectional TVS tube, and the third and fourth ends of the second bidirectional protection unit are respectively at two ends of the second bidirectional TVS tube.
In one embodiment, the second bidirectional protection unit includes a third unidirectional TVS tube and a fourth unidirectional TVS tube, the anodes of which are respectively the third end and the fourth end of the second bidirectional protection unit.
In one embodiment, the electrical overstress protection circuit further comprises: the second bidirectional protection sub-circuit comprises a third bidirectional protection unit and a fourth bidirectional protection unit, wherein the third bidirectional protection unit comprises a fifth end and a sixth end which are opposite, the fourth bidirectional protection unit comprises a seventh end and an eighth end which are opposite, and the fifth end and the seventh end are respectively used for electrically connecting two signal wires in a second pair of bidirectional signal wires of the GOA driving circuit; the sixth end is electrically connected with the eighth end; the second unidirectional conduction unit comprises a second positive end and a second negative end which are opposite, the second positive end is electrically connected with the sixth end and the eighth end, the second negative end is grounded, and the second unidirectional conduction unit is used for limiting current to flow from the second positive end to the second negative end.
In one embodiment, the electrical overstress protection circuit further comprises: the second bidirectional protection sub-circuit comprises a third bidirectional protection unit and a fourth bidirectional protection unit, wherein the third bidirectional protection unit comprises a fifth end and a sixth end which are opposite, the fourth bidirectional protection unit comprises a seventh end and an eighth end which are opposite, and the fifth end and the seventh end are respectively used for electrically connecting two signal wires in a second pair of bidirectional signal wires of the GOA driving circuit; the sixth terminal and the eighth terminal are respectively connected to the first forward terminal of the first unidirectional conductive unit.
In another aspect, another embodiment of the present invention provides a display panel including: a pixel array structure; the driving chip is electrically connected with the pixel array structure and used for driving the pixel array structure; the GOA driving circuit is electrically connected between the pixel array structure and the driving chip; the GOA driving circuit comprises a plurality of pairs of bidirectional signal lines; the electrical overstress protection circuit of any of the preceding embodiments electrically coupled to the bi-directional signal line of the GOA driver circuit.
In another aspect, another embodiment of the present invention provides a display device including the display panel according to the previous embodiment.
As can be seen from the above, the above embodiments of the present invention can achieve one or more of the following advantages:
(1) Through setting up first unidirectional current unit between first bidirectional protection subcircuit and GND, can prevent EOS from entering from GND, can realize better protection effect.
(2) The multiple bidirectional protection subcircuits can be connected to one unidirectional conduction unit in parallel, so that the cost is saved and the layout space of the circuit is saved.
Other aspects and features of the present invention will become apparent from the following detailed description, which refers to the accompanying drawings. It is to be understood, however, that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein.
Drawings
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
Fig. 1 is a schematic diagram of an overall structure of an electrical overstress protection circuit according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an embodiment of fig. 1.
Fig. 3 is a schematic structural diagram of another embodiment of fig. 1.
Fig. 4 is a schematic structural diagram of an electrical overstress protection circuit according to another embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an electrical overstress protection circuit according to another embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the invention.
[ reference numerals description ]
100: an electrical overstress protection circuit; 11: a first bidirectional protection sub-circuit; 111: a first bidirectional protection unit;
1111: a first end; 1112: a second end; 1113: a first bi-directional TVS tube; 1114: first unidirectional TVS tube, 1115: a second unidirectional TVS tube; 112: a second bidirectional protection unit; 1121: a third end; 1122: a fourth end; 1123: a second bi-directional TVS tube; 1124: a third unidirectional TVS tube; 1125: a fourth unidirectional TVS tube; 12: a second bidirectional protection sub-circuit; 121: a third bidirectional protection unit; 1211: a fifth end; 1212: a sixth end; 122: a fourth bidirectional protection unit; 1221: a seventh end; 1222: an eighth end; 21: a first unidirectional conduction unit; 211: a first forward end; 212: a first negative side; 22: a second unidirectional conduction unit; 221: a second forward end; 222: a second negative side; 200: a GOA driving circuit; 201: a first pair of bidirectional signal lines; 202: a second pair of bidirectional signal lines; 300: a driving chip; 400: and a pixel array structure.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings.
In order that those skilled in the art will better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be further noted that the division of the embodiments in the present invention is only for convenience of description, and should not be construed as a specific limitation, and features in the various embodiments may be combined and mutually referenced without contradiction.
As shown in fig. 1, an electrical overstress protection circuit 100 according to an embodiment of the present invention includes a first bidirectional protection sub-circuit 11 and a first unidirectional conducting unit 21, wherein the first bidirectional protection sub-circuit 11 includes a first bidirectional protection unit 111 and a second bidirectional protection unit 112, the first bidirectional protection unit 111 includes a first end 1111 and a second end 1112 that are opposite, the second bidirectional protection unit 112 includes a third end 1121 and a fourth end 1122, the first end 1111 and the third end 1121 are respectively used for connecting two signal lines of a first pair of bidirectional signal lines 201 of a GOA driving circuit (i.e., a protected circuit), and the second end 1112 is electrically connected with the fourth end 1122. The first unidirectional conducting unit 21 includes a first positive terminal 211 and a first negative terminal 212 opposite to each other, the first positive terminal 211 is connected to the second terminal 1112 and the fourth terminal 1122, the first negative terminal 212 is grounded, and the first bidirectional conducting unit 21 limits the current flow from the first positive terminal 211 to the first negative terminal 212. The first bidirectional protection sub-circuit 11 is used for deriving the overvoltage on the first pair of bidirectional signal lines 201, the first pair of bidirectional signal lines 201 refers to a pair of signal lines with mutually opposite currents on the GOA driving circuit, and the protection circuit needs to have bidirectional derivation capability because the signal is an alternating current bidirectional signal, but if the first bidirectional protection sub-circuit 11 is directly grounded, it is difficult to protect the EOS entering from GND. The first bidirectional protection sub-circuit 11 employs, for example, a TVS (Transient Voltage Suppressor, transient voltage suppression diode) circuit, which has extremely fast response time and relatively high surge absorption capability, and when the two ends of the TVS are subjected to instantaneous high-energy impact, the TVS can change the impedance value between the two ends from high impedance to low impedance at extremely high speed to absorb an instantaneous large current, and clamp the voltages between the two ends thereof to a predetermined value, thereby protecting the protected circuit element from the impact of the instantaneous high-voltage spike pulse. Preferably, the first and second bi-directional protection units 111 and 112 include TVS transistor devices, and the first unidirectional conduction unit 21 is a Diode (Diode) having unidirectional conduction property, i.e., the Diode is turned on when a forward voltage is applied to the anode and cathode of the Diode, and is turned off when a reverse voltage is applied to the anode and cathode. In this embodiment, the first positive terminal 221 is the positive electrode (anode) of the diode, the first negative terminal 212 is the negative electrode (cathode) of the diode, and the first negative terminal 212 is grounded. In this embodiment, the first bidirectional protection sub-circuit 11 can lead out the overvoltage on the first pair of bidirectional signal lines 201, and the first unidirectional conduction unit 21 is disposed between the first bidirectional protection sub-circuit 11 and GND, so that the damage to the circuit caused by the entry of EOS from GND can be effectively prevented. Of course, the above is merely an example of the present embodiment, and the present embodiment is not limited thereto.
The electrical overstress protection circuit provided in this embodiment may be applied to protection of a liquid crystal display panel, for example, to protect a GOA line of the display panel, and may prevent an abnormal picture caused by an abnormal GOA signal caused by an EOS entering a damaged circuit from GND.
Specifically, in one embodiment, the first bidirectional protection unit 111 includes a first bidirectional TVS tube 1113, and two ends of the first bidirectional TVS tube 1113 are a first end 1111 and a second end 1112 of the first bidirectional protection unit 111, respectively. Or in another embodiment, the first bidirectional protection unit 111 includes a first unidirectional TVS tube 1114 and a second unidirectional TVS tube 1115 with positive poles connected, and negative poles of the first unidirectional TVS tube 1114 and the second unidirectional TVS tube 1115 are a first end 1111 and a second end 1112 of the first bidirectional protection unit 111, respectively. The second bidirectional protection unit 112 may, for example, have the same structure as the first bidirectional protection unit 111, that is, the second bidirectional protection unit 112 includes, for example, a second bidirectional TVS tube 1123, and two ends of the second bidirectional TVS tube 1123 are a third end 1121 and a fourth end 1122 of the second bidirectional protection unit 112, respectively. Or the second bidirectional protection unit 112 includes a third unidirectional TVS pipe 1124 and a fourth unidirectional TVS pipe 1125 with positive poles connected, and negative poles of the third unidirectional TVS pipe 1124 and the fourth unidirectional TVS pipe 1125 are a third end 1121 and a fourth end 1122 of the second bidirectional protection unit 112, respectively. For example, referring to fig. 2, the first bi-directional protection unit 111 and the second bi-directional protection unit 112 each employ one bi-directional TVS pipe. Or referring to fig. 3, the first bidirectional protection unit 111 and the second bidirectional protection unit 112 may both have a structure in which the anodes of two unidirectional TVS tubes are connected, so that both bidirectional protection functions may be implemented.
Specifically, in one embodiment, referring to fig. 4, the electrical overstress protection circuit 100 further includes a second bidirectional protection sub-circuit 12 and a second unidirectional conduction unit 22, the second bidirectional protection sub-circuit 12 includes a third bidirectional protection unit 121 and a fourth bidirectional protection unit 122, the third bidirectional protection unit 121 includes a fifth end 1211 and a sixth end 1212 opposite, the fourth bidirectional protection unit 122 includes a seventh end 1221 and an eighth end 1222 opposite, wherein the fifth end 1211 and the seventh end 1221 are respectively used to electrically connect two signal lines of the second pair of bidirectional signal lines 202 of the GOA driving circuit; the sixth end 1212 and the eighth end 1222 are electrically connected. The second unidirectional conduction unit 22 includes a second opposite positive terminal 221 and a second negative terminal 222, the second positive terminal 221 connects the sixth terminal 1212 and the eighth terminal 1222, and the second negative terminal 222 is grounded. The second unidirectional conduction cell 22 limits the current flow from the second positive terminal 221 to the second negative terminal 222. For example, as shown in fig. 4, the GOA driving circuit includes a first pair of bidirectional signal lines 201 and a second pair of bidirectional signal lines 202, wherein the first bidirectional protection sub-circuit 11 is connected to the first pair of bidirectional signal lines 201 and the first unidirectional conductive cell 21, and the second bidirectional protection sub-circuit 12 is connected to the second unidirectional conductive cell 22 of the second pair of bidirectional signal lines 202. The specific structure of the second bidirectional protection sub-circuit 12 may refer to the structure of the first bidirectional protection sub-circuit 11 in the foregoing embodiment, and the two structures may be the same or different. The second unidirectional conducting unit 22 may select another diode with reference to the first unidirectional conducting unit 21, and the second positive terminal 211 is the positive electrode of the other diode, and the second negative terminal 212 is the negative electrode of the other diode. Of course, this embodiment is merely illustrative, and when the GOA driving circuit further includes, for example, a third pair, a fourth pair, or more pairs of bidirectional signal lines, the electrical overstress protection circuit provided in this embodiment may further include more bidirectional protection sub-circuits such as a third bidirectional protection sub-circuit and a fourth bidirectional protection sub-circuit, and correspondingly further includes more unidirectional conduction units such as a third unidirectional conduction unit and a fourth unidirectional conduction unit, and the specific structural connection manner may refer to the foregoing embodiment. In this embodiment, a plurality of bidirectional protection sub-circuits (a first bidirectional protection sub-circuit 11 and a second bidirectional protection sub-circuit 12) are respectively connected to a plurality of pairs of bidirectional signal lines (a first pair of bidirectional signal lines 201 and a second pair of bidirectional signal lines 202) on the GOA driving circuit, and each bidirectional protection sub-circuit is respectively connected to one unidirectional conduction unit, and referring to fig. 4, three pairs of bidirectional signal lines are shown in fig. 4, and the electrical overstress protection circuit 100 includes three bidirectional protection sub-circuits and three unidirectional conduction units, and each bidirectional protection sub-circuit is connected to one unidirectional conduction unit.
In another embodiment, referring to fig. 5, the electrical overstress protection circuit 100 further includes a second bidirectional protection sub-circuit 12, the second bidirectional protection sub-circuit 12 including a third bidirectional protection unit 121 and a fourth bidirectional protection unit 122, the third bidirectional protection unit 121 including opposite fifth and sixth ends 1211 and 1212, the fourth bidirectional protection unit 122 including opposite seventh and eighth ends 1221 and 1222, wherein the fifth and seventh ends 1211 and 1221 are respectively used to electrically connect two signal lines of the second pair of bidirectional signal lines 202 of the GOA driving circuit; the sixth terminal 1212 and the eighth terminal 1222 are connected to the first forward terminal 211 of the first unidirectional conductive element 21, respectively. I.e. a plurality of bi-directional protection sub-circuits share a first unidirectional conducting unit 21. Of course, the embodiment is merely illustrative, and when there are, for example, a third pair, a fourth pair or more pairs of bidirectional signal lines on the GOA driving circuit, the electrical overstress protection circuit provided in the embodiment may further include a third bidirectional protection sub-circuit, a fourth bidirectional protection sub-circuit, and other more bidirectional protection sub-circuits. Of course, the present embodiment does not limit that all the bidirectional protection sub-circuits share only one unidirectional conductive cell 21, for example, in one embodiment, the first bidirectional protection sub-circuit 11 and the second bidirectional protection sub-circuit 12 may share one unidirectional conductive cell 21, and the third bidirectional protection sub-circuit and the fourth bidirectional protection sub-circuit may share another unidirectional conductive cell. Compared with the structure shown in fig. 4, fig. 5 can use a smaller number of unidirectional conductive units, so that on one hand, the cost can be reduced, on the other hand, the fewer devices can be used, and the circuit structure is simpler for the protected device, for example, when the electric overstress protection circuit 100 is applied to a liquid crystal display panel, the occupation of the space layout of the display panel can be reduced, and the realization of a narrow frame of the display panel is facilitated. Conversely, when the number of unidirectional conducting units is not considered to be reduced, in an embodiment, the first bidirectional protection unit 111 and the second bidirectional protection unit 112 may be connected to one unidirectional conducting unit, that is, the three pairs of bidirectional signal lines 201 in fig. 4 need to correspond to 6 unidirectional conducting units.
In another aspect, an embodiment of the present invention provides a display panel, as shown in fig. 6, including a pixel array structure 400, a driving chip 300, a GOA driving circuit 200, and any of the electrical overstress protection circuits 100 provided in the foregoing embodiments, where the driving chip 300 is electrically connected to the pixel array structure 400 and is used for driving the pixel array structure 400, and the GOA driving circuit 200 is electrically connected between the pixel array structure 400 and the driving chip 300, and the GOA driving circuit 200 includes a plurality of pairs of bidirectional signal lines, specifically, for example, includes a first pair of bidirectional signal lines 201 and a second pair of bidirectional signal lines 202 mentioned in the foregoing embodiments. The electrical overstress protection circuit 100 is electrically connected to the bidirectional signal lines of the driving circuit 200, specifically, for example, the first bidirectional protection sub-circuit 11 is electrically connected to the first pair of bidirectional signal lines 201, and the second bidirectional protection sub-circuit 12 is electrically connected to the second pair of bidirectional signal lines 202, so as to implement EOS protection for the GOA driving circuit. Specifically, the display panel is, for example, a liquid crystal display panel adopting GOA technology, the driving chip 300 is, for example, an IC driving chip disposed on a PCB circuit board, the pixel array structure 400 includes, for example, a plurality of scanning lines, a plurality of data lines, and a plurality of pixel electrodes, the IC driving chip is configured to drive circuits on the TFT array substrate in the display panel and then drive the pixel electrodes to implement display, the GOA driving circuit 200 is configured to drive the scanning lines, the GOA lines include, for example, a plurality of GOA signal lines, specifically includes, for example, CK signal (clock signal) lines, and the first pair of bidirectional signal lines are, for example, a pair of bidirectional CK signal lines.
On the other hand, an embodiment of the present invention further provides a display device, where the display device includes the display panel of the foregoing embodiment, and the display device may be, for example, an electronic device such as a television, a computer display screen, or a flat panel display.
According to the electrical overstress protection circuit 100, the display panel and the display device adopting the electrical overstress protection circuit 100 provided by the embodiment of the invention, the EOS can be effectively prevented from entering from the GND by arranging the unidirectional conduction unit between the bidirectional protection sub-circuit and the GND, and the electrical overstress protection circuit has a simple structure and strong protection capability.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalent changes and variations in the above-mentioned embodiments can be made by those skilled in the art without departing from the scope of the present invention.
Claims (10)
1. An electrical overstress protection circuit comprising:
a first bidirectional protection sub-circuit comprising a first bidirectional protection unit and a second bidirectional protection unit, wherein the first bidirectional protection unit comprises a first end and a second end which are opposite, the second bidirectional protection unit comprises a third end and a fourth end which are opposite, and the first end and the third end are respectively used for electrically connecting two signal lines in a first pair of bidirectional signal lines of the GOA driving circuit; the second end and the fourth end are electrically connected;
the first unidirectional conduction unit comprises a first positive end and a first negative end which are opposite, the first positive end is electrically connected with the second end and the fourth end, the first negative end is grounded, and the first unidirectional conduction unit is used for limiting current to flow from the first positive end to the first negative end.
2. The electrical overstress protection circuit of claim 1 wherein said first bidirectional protection unit and said second bidirectional protection unit comprise TVS tube devices, said first unidirectional conduction unit being a diode, said first positive terminal being a positive pole of said diode, said first negative terminal being a negative pole of said diode.
3. The electrical overstress protection circuit of claim 2 wherein said first bidirectional protection unit comprises a first bidirectional TVS tube having two ends, said first and second ends of said first bidirectional protection unit, respectively.
4. The electrical overstress protection circuit of claim 2 wherein said first bidirectional protection unit comprises first and second unidirectional TVS tubes having anodes connected, said first and second unidirectional TVS tubes having cathodes at said first and second ends of said first bidirectional protection unit, respectively.
5. The electrical overstress protection circuit of claim 3 wherein said second bidirectional protection unit comprises a second bidirectional TVS tube, said second bidirectional TVS tube being terminated at said third and fourth ends of said second bidirectional protection unit, respectively.
6. The electrical overstress protection circuit of claim 4 wherein said second bidirectional protection unit comprises a third unidirectional TVS tube and a fourth unidirectional TVS tube having anodes connected, the cathodes of said third unidirectional TVS tube and said fourth unidirectional TVS tube being said third end and said fourth end of said second bidirectional protection unit, respectively.
7. The electrical overstress protection circuit of claim 1 further comprising:
the second bidirectional protection sub-circuit comprises a third bidirectional protection unit and a fourth bidirectional protection unit, wherein the third bidirectional protection unit comprises a fifth end and a sixth end which are opposite, the fourth bidirectional protection unit comprises a seventh end and an eighth end which are opposite, and the fifth end and the seventh end are respectively used for electrically connecting two signal wires in a second pair of bidirectional signal wires of the GOA driving circuit; the sixth end is electrically connected with the eighth end;
the second unidirectional conduction unit comprises a second positive end and a second negative end which are opposite, the second positive end is electrically connected with the sixth end and the eighth end, the second negative end is grounded, and the second unidirectional conduction unit is used for limiting current to flow from the second positive end to the second negative end.
8. The electrical overstress protection circuit of claim 1 further comprising:
the second bidirectional protection sub-circuit comprises a third bidirectional protection unit and a fourth bidirectional protection unit, wherein the third bidirectional protection unit comprises a fifth end and a sixth end which are opposite, the fourth bidirectional protection unit comprises a seventh end and an eighth end which are opposite, and the fifth end and the seventh end are respectively used for electrically connecting two signal wires in a second pair of bidirectional signal wires of the GOA driving circuit; the sixth terminal and the eighth terminal are respectively connected to the first forward terminal of the first unidirectional conductive unit.
9. A display panel, comprising:
a pixel array structure;
the driving chip is electrically connected with the pixel array structure and used for driving the pixel array structure;
the GOA driving circuit is electrically connected between the pixel array structure and the driving chip; the GOA driving circuit comprises a plurality of pairs of bidirectional signal lines;
the electrical overstress protection circuit of any one of claims 1-8 electrically connected to said bidirectional signal line of said GOA driver circuit.
10. A display device comprising the display panel according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210184048.7A CN116704964A (en) | 2022-02-24 | 2022-02-24 | Electrical overstress protection circuit, display panel and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210184048.7A CN116704964A (en) | 2022-02-24 | 2022-02-24 | Electrical overstress protection circuit, display panel and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116704964A true CN116704964A (en) | 2023-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210184048.7A Pending CN116704964A (en) | 2022-02-24 | 2022-02-24 | Electrical overstress protection circuit, display panel and display device |
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| Country | Link |
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| CN (1) | CN116704964A (en) |
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2022
- 2022-02-24 CN CN202210184048.7A patent/CN116704964A/en active Pending
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