CN112002254A - Display device - Google Patents
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- CN112002254A CN112002254A CN202010916709.1A CN202010916709A CN112002254A CN 112002254 A CN112002254 A CN 112002254A CN 202010916709 A CN202010916709 A CN 202010916709A CN 112002254 A CN112002254 A CN 112002254A
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- current limiting
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- 239000000758 substrate Substances 0.000 claims abstract description 75
- 230000000670 limiting effect Effects 0.000 claims description 58
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 7
- 239000006260 foam Substances 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 2
- 230000003068 static effect Effects 0.000 description 47
- 230000005611 electricity Effects 0.000 description 42
- 238000010586 diagram Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 230000002829 reductive effect Effects 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention discloses a display device. The display device includes: a display panel; the display panel comprises a first substrate and a second substrate which are oppositely arranged; an anti-static layer is arranged on one side, away from the second substrate, of the first substrate; a back plate; the back plate is positioned on one side of the second substrate, which is far away from the first substrate; a first conductive structure; the first conductive structure electrically connects the anti-static layer with the backplate; the back plate is grounded. The embodiment of the invention can improve the electrostatic discharge speed and the electrostatic protection capability.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
Static electricity is inevitably generated on the display panel during the manufacturing, transportation and use processes. The conventional display panel generally has an anti-static layer disposed on an upper substrate, a ground line disposed on a lower substrate, the anti-static layer of the upper substrate electrically connected to the ground line of the lower substrate through conductive silver paste, and a flexible circuit board connected to the lower substrate for conducting static electricity.
Static electricity generated on the upper substrate needs to sequentially pass through the anti-static layer, the conductive silver paste, the ground wire of the lower substrate and the flexible circuit board when being released, so that the static electricity releasing path is long, and static electricity cannot be rapidly released. In addition, if the current is too large in the electrostatic discharge process, the ground wire of the lower substrate, the wiring on the flexible circuit board and the electronic components along the way can be damaged, so that the electrostatic protection capability of the display panel is poor.
Disclosure of Invention
The invention provides a display device, which can improve the speed of electrostatic discharge and improve the electrostatic protection capability.
In a first aspect, an embodiment of the present invention provides a display device, including:
a display panel; the display panel comprises a first substrate and a second substrate which are oppositely arranged; an anti-static layer is arranged on one side, away from the second substrate, of the first substrate;
a back plate; the back plate is positioned on one side of the second substrate, which is far away from the first substrate;
a first conductive structure; the first conductive structure electrically connects the anti-static layer with the backplate; the back plate is grounded.
According to the technical scheme provided by the embodiment of the invention, the anti-static layer is electrically connected with the back plate through the first conductive structure, the back plate is grounded, and static electricity generated on the first substrate can be released through the anti-static layer, the first conductive structure and the back plate in sequence, so that static electricity protection is realized. Compared with the prior art, the static electricity discharge is carried out through the ground wire on the second substrate, the static electricity discharge path is shortened, and the static electricity discharge speed is improved; in addition, the electrostatic discharge path does not need to pass through the flexible circuit board, so that the wiring and the electronic components on the flexible circuit board cannot be damaged, and the electrostatic protection capability of the display device is improved.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, a brief description is given below of the drawings used in describing the embodiments. It should be clear that the described figures are only views of some of the embodiments of the invention to be described, not all, and that for a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 is a schematic structural diagram of a display device provided in the prior art;
FIG. 2 is a cross-sectional view of the display device shown in FIG. 1 along the cross-sectional line AA';
fig. 3 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of the display device shown in FIG. 3 along a section line BB';
FIG. 5 is a cross-sectional view of the display device shown in FIG. 3 along the section line CC';
fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a current limiting circuit according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another current limiting circuit according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a display device provided in the prior art, fig. 2 is a schematic structural diagram of a cross section of the display device shown in fig. 1 along a section line AA', which is shown in fig. 1 and fig. 2, the display device includes a display panel, the display panel includes a substrate 01 and an opposite substrate 02, the substrate 01 and the opposite substrate 02 are arranged oppositely, a first transparent conductive layer 03 is arranged on one side of the substrate 01 away from the opposite substrate 02, a conductive routing 04 is arranged in an area of the opposite substrate 02 close to one side of the substrate 01 and close to an edge, the first transparent conductive layer 03 sequentially passes through the conductive silver paste 05, the conductive routing 04, a circuit board 06 and a back board for. That is, the electrostatic discharge path generated by the substrate 01 is sequentially the first transparent conductive layer 03, the conductive silver paste 05, the conductive trace 04, the circuit board 06 and the back plate, and thus the electrostatic discharge path is longer, and therefore the electrostatic discharge speed is reduced. Meanwhile, as the electrostatic discharge path is long and passes through the circuit board 06, when the electrostatic quantity is large, electronic components on the circuit board 06 are easily damaged, and the problem of weak electrostatic protection capability is caused.
To solve the above technical problem, an embodiment of the present invention provides a display device, including: the display panel comprises a first substrate and a second substrate which are oppositely arranged, and an anti-static layer is arranged on one side of the first substrate, which is far away from the second substrate; the back plate is positioned on one side of the second substrate, which is far away from the first substrate; the first conductive structure electrically connects the anti-static layer and the back plate is grounded.
By adopting the technical scheme, the anti-static layer is electrically connected with the back plate through the first conductive structure, the back plate is grounded, and static electricity generated on the first substrate can be released sequentially through the anti-static layer, the first conductive structure and the back plate, so that static protection is realized. The electrostatic discharge path sequentially comprises the antistatic layer, the first conductive structure and the back plate, so that the electrostatic discharge path can be shortened, and the electrostatic discharge speed is increased; in addition, the electrostatic discharge path does not need to pass through the flexible circuit board, so that the wiring and the electronic components on the flexible circuit board are not damaged, and the electrostatic protection capability of the display device is improved.
The above is the core idea of the present invention, and based on the embodiments of the present invention, a person skilled in the art can obtain all other embodiments without creative efforts, which belong to the protection scope of the present invention. The technical solution in 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.
Fig. 3 is a schematic structural diagram of a display device according to an embodiment of the present invention, fig. 4 is a schematic structural diagram of a cross section of the display device shown in fig. 3 along a section line BB', and with reference to fig. 3 and fig. 4, a display device 100 according to an embodiment of the present invention includes a display panel 110, a back plate 120, and a first conductive structure 130.
The display panel 110 includes a first substrate 111 and a second substrate 112, the first substrate 111 and the second substrate 112 are disposed opposite to each other, and an anti-static layer 140 is disposed on a side of the first substrate 111 away from the second substrate 112. The back plate 120 is located on a side of the second substrate 112 facing away from the first substrate 111. The first conductive structure 130 electrically connects the anti-static layer 140 with the backplate 120, and the backplate 120 is grounded.
For example, as shown in fig. 3 and 4, the display panel 110 is a liquid crystal display panel, liquid crystal is filled between the first substrate 111 and the second substrate 112, the first substrate 111 is a color film substrate, the second substrate 112 is an array substrate, the backlight module provides a backlight source for the display panel 110, and the backlight module includes a back plate 120, which is located on a side of the backlight module away from the display panel 110. Static electricity is easily generated during the manufacturing and using processes of the display device 100, and the static electricity easily causes breakdown damage to electronic components, thereby causing irreversible damage to the display device 100. In the embodiment of the invention, the anti-static layer 140 is arranged on the side of the first substrate 111 away from the second substrate 112, the anti-static layer 140 has good conductivity, static electricity generated by the first substrate 111 is gathered to the anti-static layer 140, and the first conductive structure 130 electrically connects the anti-static layer 140 with the back plate 120, so that the first conductive structure 130 can conduct the static electricity in the anti-static layer 140 to the back plate 120, and the back plate 120 is grounded, so that the static electricity can be released through the back plate 120, and static electricity protection is realized. In the embodiment of the present invention, the electrostatic discharge process on the first substrate 111 includes the anti-static layer 140, the first conductive structure 130, and the back plate 120 in sequence, so that the electrostatic discharge path is shortened, and the electrostatic discharge speed can be increased. In addition, need not to pass through the flexible circuit board in the static electricity discharge route, be provided with a plurality of electronic components and walk the line on the flexible circuit board, so, static need not to pass through flexible circuit board walk line and electronic components, and then can reduce electronic components's damage rate, promote display device 100's static protection ability.
It should be noted that fig. 3 and fig. 4 only exemplarily show that the display device 100 is a liquid crystal display device, in other embodiments, the display device 100 may also be a light emitting diode display device, the display panel 110 is a light emitting diode display panel, and the back plate 120 may be at least a partial housing of the display device 100. In practical applications, the type of the display device 100 is not particularly limited.
Alternatively, the anti-static layer 140 may be made of a transparent conductive material, for example, the anti-static layer 140 is made of indium tin oxide. The light beam in the display device 100 can be emitted through the antistatic layer 140 without affecting the display luminance of the display device 100.
Optionally, fig. 5 is a schematic cross-sectional structure view of the display device shown in fig. 3 along a section line CC', and as shown in fig. 3 and fig. 5, the display device 100 further includes a flexible circuit board 150 and a second conductive structure 160, wherein the flexible circuit board 150 is bound on the second substrate 112, and the flexible circuit board 150 is electrically connected to the second substrate 112. The second substrate 112 is provided with an anti-static circuit 170, the second conductive structure 160 electrically connects the anti-static layer 140 and the anti-static circuit 170, the anti-static circuit 170 is electrically connected to the flexible circuit board 150, and the flexible circuit board 150 is grounded.
Specifically, as shown in fig. 3 and 5, the second substrate 112 is provided with an anti-static circuit 170, the anti-static circuit 170 is electrically connected to the flexible circuit board 150, and static electricity generated by the second substrate 112 is transmitted to the flexible circuit board 150 through the anti-static circuit 170 and is released through the flexible circuit board 150. The anti-static circuit 170 is further electrically connected to the second conductive structure 160, that is, the anti-static layer 140 is electrically connected to the flexible circuit board 150 sequentially through the second conductive structure 160, the anti-static circuit 170, so that static electricity generated by the first substrate 111 is transmitted to the flexible circuit board 150 through the anti-static layer 140, the second conductive structure 160 and the anti-static circuit 170, and is then released through the flexible circuit board 150, thereby achieving electrostatic protection. The embodiment of the invention provides another electrostatic discharge path generated on the first substrate, so that the number of the electrostatic discharge paths is increased, and the electrostatic discharge speed can be further improved. In addition, the number of the electrostatic discharge paths is increased, so that the electrostatic quantity on each electrostatic discharge path is reduced, the risk of electrostatic breakdown of electronic components is reduced, the damage rate of the electronic components is reduced, and the electrostatic protection capability of the display device 100 is improved.
Illustratively, as shown in fig. 3, the region of the first substrate 111 close to the first conductive structure 130 is Z1, the region of the first substrate 111 close to the second conductive structure 160 is Z2, and when static electricity is generated in the Z1 region, the static electricity is released through the anti-static layer 140, the first conductive structure 160 and the back plate 130; when static electricity is generated in the Z2 area, the static electricity is discharged through the anti-static layer 140, the second conductive structure 160, the anti-static circuit 170 and the flexible circuit board 150, so that the static electricity generated at different positions on the first substrate 111 can be discharged through different paths, and the static electricity discharging speed can be increased.
Optionally, the display panel includes a display area and a non-display area, and the anti-static circuit is generally disposed in the non-display area. The non-display area further comprises a binding area, and the anti-static circuit extends to the binding area and is electrically connected with the flexible circuit board arranged in the binding area.
Optionally, the anti-static circuit 170 is electrically connected to the back plate 120 through the flexible circuit board 150.
Specifically, as shown in fig. 3 and 5, the anti-static layer 140 is electrically connected to the backplate 120 sequentially through the second conductive structure 160, the anti-static line 170, the flexible circuit board 150, and the backplate is grounded, that is, static electricity generated by the first substrate 111 is transmitted to the backplate 120 sequentially through the anti-static layer 140, the second conductive structure 160, the anti-static line 170, and the flexible circuit board 150, and is released through the backplate 120, so that static electricity protection is realized. The embodiment of the invention provides another electrostatic discharge path, so that the number of the electrostatic discharge paths is increased, and the electrostatic discharge speed can be further improved. In addition, the number of the electrostatic discharge paths is increased, so that the electrostatic quantity on each electrostatic discharge path is reduced, the risk of electrostatic breakdown of electronic components is reduced, the damage rate of the electronic components is reduced, and the electrostatic protection capability of the display device 100 is improved.
Optionally, the display panel includes a first side and a second side opposite to each other, and a third side and a fourth side opposite to each other, the third side is connected to the first side and the second side, and the fourth side is connected to the first side and the second side, respectively. The second conductive structure is located on the first side, and the first conductive structure is located on at least one of the second side, the third side and the fourth side.
For example, fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present invention, as shown in fig. 6, the display panel includes a first side 110a and a second side 110b opposite to each other, and a third side 110c and a fourth side 110d opposite to each other, the third side 110c is connected to the first side 110a and the second side 110b, and the fourth side 110d is connected to the first side 110a and the second side 110b, respectively. The first conductive structure 130 and the second conductive structure 160 are located at different sides of the display panel, so as to prevent the first conductive structure 130 from contacting the second conductive structure 160, and further prevent the flexible circuit board 150 from short-circuiting.
Optionally, as shown in fig. 6, the first side 110a is a side of the display panel close to the bonding region (shown by a dotted line in the figure as the bonding region), and the second conductive structure 160 is located at the first side 110a, that is, the anti-static circuit is located at the first side 110a, which can shorten a distance between the anti-static circuit and the flexible circuit board, shorten a static discharge path, and increase a static discharge speed. In other embodiments, the first side 110a can also be the other three sides of the display panel.
It should be noted that the first conductive structure 130 may be located on one of the second side 110b, the third side 110c and the fourth side 110d, for example, fig. 6 exemplarily shows that the first conductive structure 130 is located on the third side 110 c; in other embodiments, the first conductive structure 130 may also be two or three sides located at the second side 110b, the third side 110c, and the fourth side 110d, and this example of the application is not limited in this respect.
Optionally, the second conductive structure includes a conductive silver paste.
Specifically, conductive silver paste is formed between the anti-static layer and the anti-static circuit by using a dispensing process, so that the anti-static layer is electrically connected with the anti-static circuit, the anti-static layer is electrically connected with the anti-static circuit by using the existing process equipment, process procedures and process raw materials, the process procedures can be simplified, and the raw materials are saved.
Optionally, the first conductive structure includes conductive foam or conductive glue.
The display panel and the back plate are two relatively independent parts and need to be assembled in the preparation process of the display device. First conductive structure is connected with backplate and the antistatic layer on the first base plate respectively, when taking place to rock or receive external force striking, produces relative displacement easily between display panel and the backplate, and then can produce the stress of dragging to first conductive structure, causes first conductive structure's fracture or peels off easily to influence display device's stable in structure. Therefore, in the embodiment of the invention, the antistatic layer is electrically connected with the back plate by adopting the conductive foam or the conductive adhesive, and the conductive foam or the conductive adhesive has higher adhesive force and can bear larger stress per se and is not easy to crack and peel, so that the stable electrical connection between the antistatic layer and the back plate can be maintained, and the stability of the display device is improved.
Optionally, the first conductive structure extends along a direction parallel to a side plane of the display panel and perpendicular to a thickness of the display panel.
Illustratively, as shown in fig. 3 and 4, the side plane of the display panel 110 is a YZ plane, and the direction of the thickness of the display panel 110 is a Z direction. The direction parallel to the side plane of the display panel 110 and perpendicular to the thickness of the display panel 110 is the Y direction in fig. 3, and the first conductive structures 130 extend along the Y direction. The first conductive structure 130 is disposed at a side of the display panel 110, so as to increase a contact area between the first conductive structure 130 and the anti-static layer 140, and enable static electricity on the anti-static layer 140 to be released as soon as possible.
Optionally, with continued reference to fig. 3 and fig. 5, the display device 100 further includes a current limiting circuit 180, the current limiting circuit 180 is located on the flexible circuit board 150, and an input terminal of the current limiting circuit 180 is electrically connected to the anti-static circuit 170; the output of the current limiting circuit 180 is grounded or grounded through the backplane 120. When the current received at the input terminal of the current limiting circuit 180 is less than the threshold current, the current limiting circuit 180 is turned on; when the current received at the input of the current limiting circuit 180 is greater than or equal to the threshold current, the current limiting circuit 180 is turned off.
Specifically, when the electrostatic current output by the anti-static circuit 170 is smaller than the threshold current, the electrostatic current is smaller, so that the breakdown of the electronic component is avoided, the current limiting circuit 180 is turned on, and the static electricity is released through the flexible circuit board 150, so that the breakdown of the electronic component on the flexible circuit board 150 is avoided. When the electrostatic current output by the anti-static line 170 is greater than or equal to the threshold current, the electrostatic current is large, breakdown can be caused to the electronic components, the current limiting circuit 180 is cut off, the static electricity can not be released through the flexible circuit board 150, but is released through the anti-static layer 140, the first conductive structure 130 and the back plate 120, breakdown of the electronic components on the flexible circuit board 150 by the static electricity of the large current is prevented, and the electrostatic protection capability of the display device is improved.
Optionally, fig. 7 is a schematic structural diagram of a current limiting circuit according to an embodiment of the present invention, and as shown in fig. 7, the current limiting circuit 180 includes: the switch circuit includes a first switch unit 210, a second switch unit 220, a first resistor R1, a second resistor R2, and a diode D.
The first terminal of the first switching unit 210 is an input terminal IN of the current limiting circuit 180, the second terminal of the first switching unit 210 is electrically connected to the first terminal of the second resistor R2, the second terminal of the second resistor R2 is an output terminal of the current limiting circuit 180, the third terminal of the first switching unit 210 is electrically connected to the first terminal of the first resistor R1, the second terminal of the first resistor R1 is electrically connected to the cathode of the diode D, and the anode of the diode D is electrically connected to the first terminal of the first switching unit 210. A first terminal of the second switch unit 220 is electrically connected to a first terminal of the first resistor R1, a second terminal of the second switch unit 220 is electrically connected to a second terminal of the second resistor R2, and a third terminal of the second switch unit 220 is electrically connected to a second terminal of the first switch unit 210.
When the current received by the input terminal IN of the current limiting circuit 180 is smaller than the threshold current, the first switching unit 210 is turned on, and the second switching unit 220 is turned off, so that the current limiting circuit 210 is turned on; when the current received at the input terminal IN of the current limiting circuit 180 is greater than or equal to the threshold current, the second switching unit 220 is turned on, and the first switching unit 210 is turned off, so that the current limiting circuit 180 is turned off until the current received at the input terminal of the current limiting circuit 180 is less than the threshold current.
The threshold current is a ratio of the turn-on voltage of the first switch unit 210 to the second resistor R2. That is, the threshold current I is U/R, U is the turn-on voltage of the first switching unit 210, and R is the resistance of the second resistor R2.
Specifically, when the current received by the input terminal IN of the current limiting circuit 180 is smaller than the threshold current, the electronic component is not broken down, at this time, the first switching unit 210 is turned on, the second switching unit 220 is turned off, so that the current limiting circuit 210 is turned on, the static electricity passes through the input terminal IN of the current limiting circuit 180, the first switching unit 210 and the second resistor R2 and is output from the static electricity through the output terminal OUT of the current limiting circuit 180, and the static electricity is released through the flexible circuit board 150. When the current received by the input terminal IN of the current limiting circuit 180 is greater than or equal to the threshold current, the electronic component is broken down, and at this time, the second switching unit 220 is turned on, so as to control the voltage at the third terminal of the second switching unit 22, so that the first switching unit 210 is turned off, and the current limiting circuit 180 is turned off. The diode D has a unidirectional conduction function, so as to prevent static electricity from flowing back into the display panel, and at this time, the static electricity is released through the anti-static layer 140, the first conductive structure 130 and the back plate 120, and is not required to be released through the flexible circuit board 150. According to the embodiment of the invention, the first switch unit 210 and the second switch unit 220 are matched to release the static electricity of small current through the flexible circuit board, the static electricity of large current does not need to be released through the flexible circuit board, the electronic components on the flexible circuit board are prevented from being punctured by the static electricity of large current, and the protection capability of the display device is improved.
For example, fig. 8 is a schematic structural diagram of another current limiting circuit according to an embodiment of the present invention, and as shown in fig. 8, the first switching unit includes a first NPN transistor Q1 and a second NPN transistor Q2, and the second switching unit includes a PNP transistor Q3.
The collector of the first NPN transistor Q1 is electrically connected to the anti-static circuit, the emitter of the first NPN transistor Q1 and the base of the PNP transistor are both electrically connected to the first end of the second resistor R2, the base of the first NPN transistor Q1 is electrically connected to the emitter of the second NPN transistor Q2, the collector of the second NPN transistor Q2 is electrically connected to the collector of the first NPN transistor, the base of the second NPN transistor Q2 and the collector of the PNP transistor are both electrically connected to the first end of the first resistor R1, and the emitter of the PNP transistor Q3 is electrically connected to the second end of the second resistor R2.
For example, as shown IN fig. 8, when the current received at the input terminal IN of the current limiting circuit 180 is smaller than the threshold current, the first NPN transistor Q1 and the second NPN transistor Q2 are IN saturation conduction, the PNP transistor Q3 is turned off, and the static electricity passes through the input terminal IN of the current limiting circuit 180, the first NPN transistor Q1, the second NPN transistor Q2, and the second resistor R2 and is output from the output terminal OUT of the current limiting circuit 180, so that the static electricity of a small current can be discharged through the flexible circuit board. When the current received by the input terminal IN of the current limiting circuit 180 is greater than or equal to the threshold current, the voltage drop across the second resistor R2 increases, and the sum of the voltage drop across the second resistor R2 and the voltage drop across the first NPN transistor Q1 approaches the base voltage drop of the second NPN transistor Q2, the PNP transistor Q3 is saturated and turned on, and the first NPN transistor Q1 and the second NPN transistor Q2 are turned off and turned off, and the current passing from the input terminal IN of the current limiting circuit 180 to the output terminal OUT of the current limiting circuit 180 starts to be limited; the first NPN transistor Q1 turns off to reduce the current flowing through the current limiting circuit 180, the current reduction causes the voltage drop across the second resistor R2 to be synchronously reduced, the first NPN transistor Q1 and the second NPN transistor Q2 return to the saturation conducting state, and the PNP transistor Q3 becomes the critical cut-off state. After a period of dynamic balancing, the current is locked at a relatively fixed value. Therefore, the current flowing through the flexible circuit board is limited in a safe range, and the electronic components on the flexible circuit board are not broken down due to the excessive current.
It should be noted that, in practical applications, as long as the current limiting function can be achieved, that is, when the current received at the input terminal of the current limiting circuit is less than the threshold current, the current limiting circuit is turned on, and when the current received at the input terminal of the current limiting circuit is greater than or equal to the threshold current, the current limiting circuit is turned off. In the exemplary arrangement of fig. 8, the first switch unit includes a first NPN transistor and a second NPN transistor, and the second switch unit includes a PNP transistor, in other embodiments, the transistor types of the first switch unit and the second switch unit may be changed according to the design requirement of the display panel. The embodiment of the invention does not limit the specific circuit structure of the current limiting circuit.
The display device 100 provided in the embodiment of the present invention may be a mobile phone, a tablet computer, a notebook computer, a television, a digital photo frame, a navigator, an intelligent wearable display device, or any product or component with a display function in specific implementation, which is not particularly limited in the embodiment of the present invention.
The foregoing is considered as illustrative of the preferred embodiments of the invention and technical principles employed. The present invention is not limited to the specific embodiments herein, and it will be apparent to those skilled in the art that various changes, rearrangements, and substitutions can be made without departing from the scope of the invention. Therefore, although the present invention has been described in more detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the claims.
Claims (10)
1. A display device, comprising:
a display panel; the display panel comprises a first substrate and a second substrate which are oppositely arranged; an anti-static layer is arranged on one side, away from the second substrate, of the first substrate;
a back plate; the back plate is positioned on one side of the second substrate, which is far away from the first substrate;
a first conductive structure; the first conductive structure electrically connects the anti-static layer with the backplate; the back plate is grounded.
2. The display device according to claim 1, further comprising a flexible circuit board and a second conductive structure; the flexible circuit board is electrically connected with the second substrate in a binding manner; an anti-static circuit is arranged on the second substrate;
the second conductive structure electrically connects the anti-static layer with the anti-static circuit; the anti-static circuit is electrically connected with the flexible circuit board; the flexible circuit board is grounded.
3. The display device according to claim 2, wherein the antistatic line is electrically connected to the back plate through the flexible circuit board.
4. The display device according to claim 2, wherein the display panel comprises first and second opposing sides, and third and fourth opposing sides;
the third side edge is respectively connected with the first side edge and the second side edge; the fourth side edge is respectively connected with the first side edge and the second side edge;
the second conductive structure is positioned at the first side edge; the first conductive structure is located on at least one of the second side, the third side, and the fourth side.
5. The display device according to claim 2, wherein the second conductive structure comprises a conductive silver paste.
6. The display device according to claim 1, wherein the first conductive structure comprises conductive foam or conductive glue.
7. The display device according to claim 1, wherein the first conductive structure extends in a direction parallel to a side plane of the display panel and perpendicular to a thickness of the display panel.
8. The display device according to claim 2, further comprising a current limiting circuit; the current limiting circuit is positioned on the flexible circuit board, and the input end of the current limiting circuit is electrically connected with the anti-static circuit; the output end of the current limiting circuit is grounded or grounded through the back plate;
when the current received by the input end of the current limiting circuit is smaller than the threshold current, the current limiting circuit is conducted;
when the current received by the input end of the current limiting circuit is larger than or equal to the threshold current, the current limiting circuit is cut off.
9. The display device according to claim 8, wherein the current limiting circuit comprises: the circuit comprises a first switch unit, a second switch unit, a first resistor, a second resistor and a diode;
the first end of the first switch unit is the input end of the current limiting circuit; the second end of the first switch unit is electrically connected with the first end of the second resistor; the second end of the second resistor is the output end of the current limiting circuit; the third end of the first switch unit is electrically connected with the first end of the first resistor; the second end of the first resistor is electrically connected with the cathode of the diode; the anode of the diode is electrically connected with the first end of the first switch unit; the first end of the second switch unit is electrically connected with the first end of the first resistor; a second end of the second switch unit is electrically connected with a second end of the second resistor; the third end of the second switch unit is electrically connected with the second end of the first switch unit;
when the current received by the input end of the current limiting circuit is smaller than the threshold current, the first switch unit is switched on, and the second switch unit is switched off, so that the current limiting circuit is switched on;
when the current received by the input end of the current limiting circuit is greater than or equal to the threshold current, the second switch unit is switched on, and the first switch unit is switched off, so that the current limiting circuit is switched off until the current received by the input end of the current limiting circuit is smaller than the threshold current;
the threshold current is a ratio of the turn-on voltage of the first switch unit to the second resistor.
10. The display device according to claim 9, wherein the first switching unit includes a first NPN transistor and a second NPN transistor; the second switch unit comprises a PNP tube;
the collector of the first NPN tube is electrically connected with the anti-static circuit; the emitter of the first NPN tube and the base of the PNP tube are electrically connected with the first end of the second resistor; the base electrode of the first NPN tube is electrically connected with the emitter electrode of the second NPN tube; the collector electrode of the second NPN tube is electrically connected with the collector electrode of the first NPN tube; the base electrode of the second NPN tube and the collector electrode of the PNP tube are electrically connected with the first end of the first resistor; and the emitter of the PNP tube is electrically connected with the second end of the second resistor.
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| CN112002254B (en) | 2022-07-12 |
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Effective date of registration: 20221014 Address after: 3rd Floor, Building B1, Wanjiang Fortune Plaza, No. 88 Ruixiang Road, Guandou Street, Jiujiang District, Wuhu City, Anhui Province 241060 Patentee after: Wuhu Tianma Automotive Electronics Co.,Ltd. Address before: 201201 888 and 889 Huiqing Road, Pudong New Area, Shanghai Patentee before: SHANGHAI TIANMA MICROELECTRONICS Co.,Ltd. |