CN204044791U - Flexible PCB and capacitive touch display device - Google Patents
Flexible PCB and capacitive touch display device Download PDFInfo
- Publication number
- CN204044791U CN204044791U CN201420323563.XU CN201420323563U CN204044791U CN 204044791 U CN204044791 U CN 204044791U CN 201420323563 U CN201420323563 U CN 201420323563U CN 204044791 U CN204044791 U CN 204044791U
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- conductive layer
- circuit board
- board substrate
- flexible circuit
- flexible
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- 239000000758 substrate Substances 0.000 claims abstract description 55
- 238000001914 filtration Methods 0.000 claims abstract description 26
- 238000009413 insulation Methods 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 238000002955 isolation Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 3
- 238000005868 electrolysis reaction Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The utility model provides a kind of flexible PCB and capacitive touch display device.The public electrode voltages filtering circuit that described flexible PCB comprises flexible circuit board substrate and arranges thereon; Described flexible PCB also comprises filter unit, and described filter unit comprises: conductive layer, is arranged on this flexible circuit board substrate, is electrically connected with the public electrode voltages output terminal of this public electrode voltages filtering circuit; Insulation course, is layed on this conductive layer; And the screened film of ground connection, is layed on this insulation course, parallel with described conductive layer.The utility model can reduce the interference that capacitive touch screen is subject to due to the noise of public electrode voltages.
Description
Technical field
The utility model relates to capacitance touch technology field, particularly relates to a kind of flexible PCB and capacitive touch display device.
Background technology
The long and narrow public electrode that capacitive touch screen four limit is coated with forms a low-voltage AC electric field in conductor layer.When finger touch screen, due to human body electric field, coupling capacitance can be formed between finger and conductor layer, the electric current that the public electrode on capacitive touch screen four limit sends can flow to contact, and the power of this electric current is directly proportional to the distance of finger to public electrode, be positioned at ratio and the power of the controller calculating current after capacitive touch screen, accurately calculate the position of touch point.
But capacitive touch screen easily produces drift by noise, when environment temperature, ambient humidity and environment of electric field change, all can cause the drift of capacitive touch screen, cause touch point position calculation inaccurate.The noise that capacitive touch screen is subject to is caused by the noise of VCOM (public electrode voltages) greatly.In the prior art, adopt a public electrode voltages filtering circuit to carry out filtering to carrying out the VCOM of self-driven integrated chip at FPC (flexible printed circuit, flexible PCB) to the processing mode of the VCOM noise of capacitive touch screen.The public electrode voltages of this public electrode voltages filtering circuit to the driving integrated chip input that capacitive touch display device comprises carries out filtering, and filtered public electrode voltages is inputted the public electrode of the capacitive touch screen surrounding setting that this capacitive touch display device comprises by public electrode voltages output terminal.Even due to the restriction in FPC space, do not carry out any filtering process, the frequency range of the VCOM noise be subject to due to capacitive touch screen is a lot, and the filter effect of such processing mode to the noise of VCOM is limited.
Utility model content
Fundamental purpose of the present utility model is to provide a kind of flexible PCB and capacitive touch display device, to reduce the interference that capacitive touch screen is subject to due to the noise of public electrode voltages.
In order to achieve the above object, the utility model provides a kind of flexible PCB, is applied in capacitive touch display device, the public electrode voltages filtering circuit comprising flexible circuit board substrate and arrange thereon; Described flexible PCB also comprises filter unit, and described filter unit comprises:
Conductive layer, is arranged on this flexible circuit board substrate, is electrically connected with the public electrode voltages output terminal of this public electrode voltages filtering circuit;
Insulation course, is layed on this conductive layer;
And the screened film of ground connection, is layed on this insulation course, parallel with described conductive layer.
During enforcement, described flexible PCB comprises one deck flexible circuit board substrate, and the region this layer of flexible circuit board substrate not being provided with described conductive layer is equipped with the Electro-static Driven Comb metal level of ground connection, and this Electro-static Driven Comb metal level and this conductive layer insulate.
During enforcement, other circuit isolation that this conductive layer and this layer of flexible circuit board are arranged.
During enforcement, described flexible PCB comprises the flexible circuit board substrate of the overlapping setting of multilayer;
Described public electrode voltages filtering circuit is arranged at least on flexible circuit board substrate described in one deck; This region at least one deck flexible circuit board substrate not being provided with described conductive layer is equipped with the Electro-static Driven Comb metal level of ground connection, and this Electro-static Driven Comb metal level and this conductive layer insulate.
During enforcement, when being provided with described conductive layer at least two-layer adjacent flexible circuit board substrate, there is not overlapping region in the conductive layer on this at least two-layer adjacent flexible circuit board substrate in positive apparent direction.
During enforcement, when flexible circuit board substrate described in one deck being provided with described conductive layer, other circuit isolation that this conductive layer and this layer of flexible circuit board are arranged.
During enforcement, flexible PCB described in the utility model also comprises: be arranged on described screened film be arranged in order at least one described in filter unit, be provided with insulation course between filter unit described in adjacent two on layer flexible circuit board substrate described in.
The utility model additionally provides a kind of capacitive touch display device, comprises above-mentioned flexible PCB.
Compared with prior art, flexible PCB described in the utility model embodiment and capacitive touch display device, by setting up filter unit on the flexible circuit board substrate being provided with public electrode voltages filtering circuit, this public electrode voltages filtering circuit receives the public electrode voltages of self-driven integrated chip and carries out preliminary ac filter to it, and the filter unit that the utility model embodiment is set up comprises the conductive layer be electrically connected with the public electrode voltages output terminal of this public electrode voltages filtering circuit, be layed in the insulation course on this conductive layer, and be layed in the screened film of the also ground connection parallel with this conductive layer on this insulation course, this insulation course is layed between this conductive layer and this screened film, to make there is distance between this conductive layer and this screened film, to form filter capacitor, by this filter capacitor, the AC noise of high frequency is discharged into ground, to play the object of further public electrode voltages being carried out to ac filter, this screened film can play the effect that noise to external world carries out shielding simultaneously, thus reduce the noise of touch-screen, reduce the drift of signal.
Accompanying drawing explanation
Fig. 1 is the public electrode voltages filtering circuit that the flexible PCB described in the utility model embodiment is arranged and the electrical connection schematic diagram driving integrated chip;
Fig. 2 is the cross sectional representation of the filter unit that the flexible PCB described in the utility model embodiment comprises;
Fig. 3 is the cross sectional representation of the Double-layer flexible circuit board described in the utility model one specific embodiment.
Embodiment
Flexible PCB described in the utility model embodiment, is applied in capacitive touch display device, comprises flexible circuit board substrate; As shown in Figure 1, described flexible PCB also comprises: be arranged at the public electrode voltages filtering circuit 11 on this flexible circuit board substrate, the public electrode voltages VCOM inputted for the driving integrated chip 12 comprised this capacitive touch display device carries out filtering, and filtered public electrode voltages is inputted the public electrode of the capacitive touch screen surrounding setting that this capacitive touch display device comprises by public electrode voltages output terminal OUTPUT;
Described flexible PCB also comprises filter unit,
As shown in Figure 2, described filter unit comprises:
Conductive layer 21, be arranged on flexible circuit board substrate 20, be electrically connected with the public electrode voltages output terminal of this public electrode voltages filtering circuit (position relationship between this conductive layer 21 and flexible circuit board substrate, and the electrical connection between this conductive layer 21 and this public electrode voltages output terminal does not show in fig. 2);
Insulation course 22, to be layed on this conductive layer 21;
And the screened film 23 of ground connection, is layed on this insulation course 22, parallel with described conductive layer 21.
Concrete, described public electrode voltages filtering circuit can comprise one be electrically connected on this public electrode voltages output terminal OUTPUT and ground hold between electric capacity, also can carry out the circuit of filtering to the high frequency noise of interchange for other.
Flexible PCB described in the utility model embodiment by setting up filter unit on the flexible circuit board substrate being provided with public electrode voltages filtering circuit, this public electrode voltages filtering circuit receives the public electrode voltages of self-driven integrated chip and carries out preliminary ac filter to it, and the filter unit that the utility model embodiment is set up comprises the conductive layer be electrically connected with the public electrode voltages output terminal of this public electrode voltages filtering circuit, be layed in the insulation course on this conductive layer, and be layed in the screened film of the also ground connection parallel with this conductive layer on this insulation course, this insulation course is layed between this conductive layer and this screened film, to make there is distance between this conductive layer and this screened film, to form filter capacitor between this conductive layer and this screened film, by this filter capacitor, the AC noise of high frequency is discharged into ground, to play the object of further public electrode voltages being carried out to ac filter, this screened film can play the effect that noise to external world carries out shielding simultaneously, thus reduce the noise of touch-screen, reduce the drift of signal.
On described flexible circuit board substrate except described public electrode filtering circuit and described filter unit, also be provided with supply voltage circuit, control signal circuit, data transmission circuit, booster circuit and backlight circuit etc., other circuit that the conductive layer that this filter unit comprises and described flexible circuit board substrate are arranged all insulate.
Concrete, as shown in Figure 2, distance between described conductive layer 21 and described screened film 23 is d1, s is the area of this conductive layer 21, ε is constant, ε r1 is the dielectric constant between this conductive layer 21 and this screened film 23, then the capacitance C of the filter capacitor formed between described conductive layer 21 and described screened film 23 is as follows:
C＝ε×εr1×s/d1；
Therefore the area of conductive layer 21 can be determined according to the size of required capacitance.
When practical operation, in the flexible PCB described in the utility model embodiment,
The Electro-static Driven Comb metal level of ground connection, is layed in the region described layer flexible circuit board substrate not being provided with described conductive layer, insulate with described conductive layer.
In the flexible PCB described in the utility model embodiment, the region described layer flexible circuit board substrate not being provided with described conductive layer is equipped with the Electro-static Driven Comb metal level of ground connection, and this Electro-static Driven Comb metal level and this conductive layer insulate.The material of this Electro-static Driven Comb metal level can be any can the metal of release electrostatic, but when practical operation, this Electro-static Driven Comb metal level adopts electrolysis layers of copper usually.
When practical operation, flexible PCB described in the utility model embodiment can be individual layer, namely one deck flexible circuit board substrate is only comprised, the region this layer of flexible circuit board substrate not being provided with described conductive layer is equipped with the Electro-static Driven Comb metal level of ground connection, and this Electro-static Driven Comb metal level and this conductive layer insulate.
Flexible PCB described in the utility model embodiment also can be multilayer, namely the flexible circuit board substrate of the overlapping setting of multilayer is comprised, the Electro-static Driven Comb metal level of the ground connection that the conductive layer then one deck flexible circuit board substrate arranged and one deck flexible circuit board substrate adjacent with this layer of flexible circuit board substrate are provided with also forms filter capacitor, and then carries out further ac filter to this public electrode voltages.
Preferably, when described flexible PCB comprises the flexible circuit board substrate of the overlapping setting of multilayer, and when being provided with conductive layer at least two-layer adjacent flexible circuit board substrate, overlapping region is there is not in the conductive layer on this at least two-layer adjacent flexible circuit board substrate in positive apparent direction, guarantee that conductive layer can form filter capacitor with the Electro-static Driven Comb metal level of the ground connection on adjacent flexible circuit board substrate, thus the effect of ac filter is strengthened.
Preferably, flexible PCB described in the utility model embodiment, also comprise: be arranged on described screened film be arranged in order at least one described in filter unit, be provided with insulation course between filter unit described in adjacent two on layer flexible circuit board substrate described in.Due to the limited area of flexible circuit board substrate, therefore on described screened film, increase filter unit again, thus produce filter unit in parallel, increase capacitance, to reach required filter effect.
According to a kind of embodiment, as shown in Figure 3, flexible PCB described in the utility model comprises upper strata flexible circuit board substrate 31 and lower floor's flexible circuit board substrate 32 of overlapping setting, upper strata flexible circuit board substrate 31 is provided with conductive layer 311, this conductive layer 311 is equipped with insulation course 312, this insulation course 312 is equipped with the screened film 313 of ground connection;
The region that this upper strata flexible circuit board substrate 31 is not provided with conductive layer 311 is equipped with the electrolysis layers of copper of ground connection, and this layers of copper and this conductive layer 311 insulate; Also electrolysis layers of copper is equipped with on this lower floor's flexible circuit board substrate 32 surface; All filter capacitor is formed between this conductive layer 311 and this screened film 313 and between this conductive layer 311 and this lower floor's flexible circuit board substrate 32;
The area of to be d1, s be this conductive layer 311 of the distance between described conductive layer 311 and described screened film 313, ε is constant, and ε r1 is the dielectric constant between this conductive layer 311 and this screened film 313;
Distance between the described lower floor flexible circuit board substrate 32 that described conductive layer 311 and surface the are equipped with layers of copper dielectric constant that to be d2, ε r2 be between this conductive layer 311 and this lower floor's flexible circuit board substrate 32,
The capacitance of the filter capacitor of the formation then between this conductive layer 311 and this screened film 313 and the capacitance sum C ' of filter capacitor formed between this conductive layer 311 and this lower floor's flexible circuit board substrate 32 as follows:
C’＝ε×εr1×s/d1+ε×εr2×s/d2。
In capacitive touch screen, the maximum noise that individual layer on cell (externally embedded type) touch-screen receives is caused by VOM, and therefore, the flexible PCB described in the utility model embodiment is especially suitable for individual layer on cell touch display unit.
Capacitive touch display device described in the utility model embodiment, comprises above-mentioned flexible PCB.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (8)
1. a flexible PCB, is applied in capacitive touch display device, the public electrode voltages filtering circuit comprising flexible circuit board substrate and arrange thereon; It is characterized in that, described flexible PCB also comprises filter unit, and described filter unit comprises:
Conductive layer, is arranged on this flexible circuit board substrate, is electrically connected with the public electrode voltages output terminal of this public electrode voltages filtering circuit;
Insulation course, is layed on this conductive layer;
And the screened film of ground connection, is layed on this insulation course, parallel with described conductive layer.
2. flexible PCB as claimed in claim 1, it is characterized in that, comprise one deck flexible circuit board substrate, the region this layer of flexible circuit board substrate not being provided with described conductive layer is equipped with the Electro-static Driven Comb metal level of ground connection, and this Electro-static Driven Comb metal level and this conductive layer insulate.
3. flexible PCB as claimed in claim 2, is characterized in that, other circuit isolation that this conductive layer and this layer of flexible circuit board are arranged.
4. flexible PCB as claimed in claim 1, is characterized in that, comprise the flexible circuit board substrate of the overlapping setting of multilayer;
Described public electrode voltages filtering circuit is arranged at least on flexible circuit board substrate described in one deck; This region at least one deck flexible circuit board substrate not being provided with described conductive layer is equipped with the Electro-static Driven Comb metal level of ground connection, and this Electro-static Driven Comb metal level and this conductive layer insulate.
5. flexible PCB as claimed in claim 4, it is characterized in that, when being provided with described conductive layer at least two-layer adjacent flexible circuit board substrate, there is not overlapping region in the conductive layer on this at least two-layer adjacent flexible circuit board substrate in positive apparent direction.
6. the flexible PCB as described in claim 4 or 5, is characterized in that, when flexible circuit board substrate described in one deck being provided with described conductive layer, and other circuit isolation that this conductive layer and this layer of flexible circuit board are arranged.
7. the flexible PCB as described in claim arbitrary in claim 1 to 5, it is characterized in that, also comprise: be arranged on described screened film be arranged in order at least one described in filter unit, be provided with insulation course between filter unit described in adjacent two on flexible circuit board substrate described in.
8. a capacitive touch display device, is characterized in that, comprises the flexible PCB described in arbitrary claim in claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420323563.XU CN204044791U (en) | 2014-06-17 | 2014-06-17 | Flexible PCB and capacitive touch display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420323563.XU CN204044791U (en) | 2014-06-17 | 2014-06-17 | Flexible PCB and capacitive touch display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204044791U true CN204044791U (en) | 2014-12-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420323563.XU Expired - Fee Related CN204044791U (en) | 2014-06-17 | 2014-06-17 | Flexible PCB and capacitive touch display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204044791U (en) |
-
2014
- 2014-06-17 CN CN201420323563.XU patent/CN204044791U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141224 |