CN207601766U - Pressure touching control circuit, touch screen and display equipment - Google Patents
Pressure touching control circuit, touch screen and display equipment Download PDFInfo
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- CN207601766U CN207601766U CN201721383815.8U CN201721383815U CN207601766U CN 207601766 U CN207601766 U CN 207601766U CN 201721383815 U CN201721383815 U CN 201721383815U CN 207601766 U CN207601766 U CN 207601766U
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- touch screen
- control circuit
- touching control
- varistor
- pressure
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Abstract
The utility model discloses a kind of pressure touching control circuit, touch screen and display equipment, the pressure touching control circuit includes four branches, four branches form electric bridge, and wherein three branch roads are respectively equipped with conventional, electric-resistance R1, R2, R3, and the 4th branch road is equipped with varistor.Pressure touching control circuit in the utility model forms electric bridge, and wherein three branch roads are respectively equipped with conventional, electric-resistance R1, R2, R3 by using four branches, and the 4th branch road is equipped with varistor；Due to for non-equal arm bridge, so as to improve the sensitivity of the pressure sensitive of pressure touching control circuit, while inhibiting the generation of null offset phenomenon.When the 4th branch road is equipped with two varistors R4 and R4 ', varistor R4 and R4 ' are in parallel, so as to inhibit the generation of temperature drift phenomenon, the sensitivity of pressure sensitive is further improved simultaneously, furthermore it is possible to reduce cost, reduce space occupancy rate.
Description
Technical field
The utility model is related to a kind of pressure touching control circuit, touch screen and display equipment, belong to LCD fields.
Background technology
Such as touch screen of mobile phone, tablet smart machine is usually all corresponding by being set in touch screen fringe region
Pressure sensor pressure is sensed, so as to respond.Existing touch screen, the internal pressure touch electricity set
Road as shown in Figure 1, being typically all to be fabricated to varistor by poly-Si strain gauge materials, is then designed the varistor
Into equal arm bridge, it is arranged in the border areas of touch screen；When equal arm bridge input voltage Ui is given in outside, during equal arm bridge stress
Bridge arm balance is broken, then output voltage changes.But the Yi Shang prior art still has following shortcoming：
1st, pressure touching control circuit is designed to equal arm bridge, when the appearance of four bridge arms changes in proportion, then equal arm bridge institute
The voltage change unobvious of output, the sensitivity for leading to pressure sensitive are poor；But the if pressure touching control circuit design
Into can not inhibit during single bridge arm to null offset phenomenon again；
2nd, due to the influence of material and volume, the pressure touching control circuit is integrally generally laid in touch screen
Border areas can not comply with the development trend of narrow-frame touch panel；In addition, since border regions itself are narrow, will press
Power touch-control circuit be integrally laid in touch screen border areas further cause touch screen sensitivity it is poor.
Utility model content
One of the purpose of this utility model is, provides a kind of pressure touching control circuit, it can improve the spirit of pressure sensitive
Sensitivity, while inhibit the generation of null offset phenomenon；
The two of the purpose of this utility model are, provide a kind of touch screen of high sensitivity；
The three of the purpose of this utility model are, provide a kind of display equipment of high sensitivity.
In order to solve the above technical problems, the utility model adopts the following technical scheme：A kind of pressure touching control circuit, including
Four branches, described four branches form electric bridges, and wherein three branch roads are respectively equipped with conventional, electric-resistance R1, R2, R3, and the 4th
A branch road is equipped with varistor.
Preferably, the 4th branch road is equipped with two varistors R4 and R4 ', and varistor R4 and R4 ' are in parallel,
So as to inhibit the generation of temperature drift phenomenon, (molecule denominator is of substantially equal in the case of minor fluctuations, so as to suppression
The effect of resistance variations processed can also inhibit the generation of temperature drift phenomenon to a certain extent), while further improve pressure
(when pressure applies, the difference of molecule denominator can be increasing, causes electric bridge more uneven, output signal for the sensitivity of sensing
Amount increases namely variation is fed back in the form of product in circuit, the amplification of change in resistance, is more advantageous to improving sensitivity), separately
Outside, cost can be reduced, reduces space occupancy rate.
Include the touch screen of aforementioned pressure touch-control circuit.
In aforementioned touch screen, the varistor is placed on AA areas (i.e. the Ative Area, effectively display of touch screen
Region；Refer to the region for showing image)；Conventional, electric-resistance R1, R2, R3 are placed on the border areas (i.e. frame region) of touch screen, from
And the space occupancy rate in border areas can be reduced, while increase the sensitivity of the varistor in AA areas, and then improve touch
The sensitivity of screen.
In above-mentioned touch screen, the varistor is " L " type, so as to meet the needs of pressure sensitive, simultaneously
Reduce area occupied.
Display equipment comprising foregoing touch screen.
Compared with prior art, the pressure touching control circuit in the utility model forms electric bridge by using four branches, and
Wherein three branch roads are respectively equipped with conventional, electric-resistance R1, R2, R3, and the 4th branch road is equipped with varistor；Due to for non-equiarm
Electric bridge so as to improve the sensitivity of the pressure sensitive of pressure touching control circuit, while inhibits the generation of null offset phenomenon.Work as institute
The 4th branch road stated is equipped with two varistors R4 and R4 ', and varistor R4 and R4 ' are in parallel, so as to inhibit temperature
Drift phenomenon generation (molecule denominator is of substantially equal in the case of minor fluctuations, so as to have the function of inhibition resistance variations,
Can also inhibit the generation of temperature drift phenomenon to a certain extent), while the sensitivity for further improving pressure sensitive (is being pressed
Power apply when, the difference of molecule denominator can increasing, causes electric bridge more uneven, output signal amount increase namely variation with
The form of product is fed back in circuit, the amplification of change in resistance, is more advantageous to improving sensitivity), furthermore it is possible to cost is reduced,
Reduce space occupancy rate.By using the pressure touching control circuit, so as to improve touch screen and show the sensitive of equipment
Degree.Especially, by the way that the varistor to be placed on to AA areas (i.e. Ative Area, the effective display area domain of touch screen；Refer to
Show the region of image)；Conventional, electric-resistance R1, R2, R3 are placed on the border areas (i.e. frame region) of touch screen, can also reduce
The space occupancy rate in border areas, while increase the sensitivity of the varistor in AA areas, and then further improve touch screen
Sensitivity.By being " L " type by the varistor, so as to meet the needs of pressure sensitive, while occupancy is reduced
Area.
Description of the drawings
Fig. 1 is the electrical block diagram of pressure touching control circuit in the prior art；
Fig. 2 is the electrical block diagram of pressure touching control circuit in the utility model；
Fig. 3 is the circuit structure of pressure touching control circuit and its position view in touch screen in the utility model；
Fig. 4 is the effect diagram that varistor parallel connection generates.
The utility model is further described with reference to the accompanying drawings and detailed description.
Specific embodiment
The embodiment 1 of the utility model：A kind of pressure touching control circuit, including four branches, described four branches are formed
Electric bridge, and wherein three branch roads are respectively equipped with conventional, electric-resistance R1, R2, R3, the 4th branch road is equipped with varistor.
Embodiment 2：A kind of pressure touching control circuit, as shown in Fig. 2, including four branches, described four branches form electricity
Bridge, and wherein three branch roads are respectively equipped with conventional, electric-resistance R1, R2, R3, the 4th branch road is equipped with varistor；Wherein, institute
The 4th branch road stated is equipped with two varistors R4 and R4 ', and varistor R4 and R4 ' are in parallel.
Embodiment 3：Include the touch screen of pressure touching control circuit described in embodiment 1.
Embodiment 4：Include the touch screen of pressure touching control circuit described in embodiment 1.As shown in figure 3, the varistor
It is placed on the AA areas of touch screen；Conventional, electric-resistance R1, R2, R3 are placed on the border areas of touch screen.
Embodiment 5：Include the touch screen of pressure touching control circuit described in embodiment 1.The varistor is placed on touch
Ping AA areas；Conventional, electric-resistance R1, R2, R3 are placed on the border areas of touch screen.The varistor is " L " type.
Embodiment 6：Include the touch screen of pressure touching control circuit described in embodiment 2.
Embodiment 7：Include the touch screen of pressure touching control circuit described in embodiment 2.The varistor is placed on touch
Ping AA areas；Conventional, electric-resistance R1, R2, R3 are placed on the border areas of touch screen.
Embodiment 8：Include the touch screen of pressure touching control circuit described in embodiment 2.The varistor is placed on touch
Ping AA areas；Conventional, electric-resistance R1, R2, R3 are placed on the border areas of touch screen.The varistor is " L " type.
Embodiment 9：Include the display equipment of any touch screen of embodiment 3~8.
A kind of operation principle of the embodiment of the utility model：
In the pressure touching control circuit of the utility model, described four branches form electric bridge, and wherein three branch roads are set respectively
There are conventional, electric-resistance R1, R2, R3, the 4th branch road is equipped with varistor, due to for wheatstone bridge, thus can be more readily detected
The remolding sensitivity equal arm bridge for going out pressure namely pressure detecting is sensitiveer, in combination with conventional, electric-resistance R1, R2, R3, and can press down
The phenomenon that null offset processed, occurs.In addition, the AA areas of touch screen are placed on after the varistor R4 is in parallel with R4 ', R1,
R2, R3 are conventional, electric-resistance, are conveniently positioned over the border areas of touch screen, so as to when stress occurs, be placed on the R4 in AA areas with
R4 ' is more easily detected power and resistance value is caused to generate variation, and variation feeds back in the form of product in circuit (R=(R4*
R4 ')/(R4+R4 ')), it is more advantageous to improving the sensitivity of pressure sensitive, inhibits the phenomenon that temperature drift, reduce simultaneously
The occupancy in border areas complies with the development trend of narrow-frame touch panel.In the specific implementation, poly- may be used in R4 and R4 '
Si strain gauge materials make, R4 transverse windings, and R4 ' longitudinal direction coilings are more advantageous to the detection to pressure.
Specifically, such as Fig. 4 as can be seen that in the utility model, varistor R4 with R4 ' by the way of in parallel, by R
=(R4*R4 ')/(R4+R4 ') is it is found that can be in the case of minor fluctuations so that molecule denominator is of substantially equal, so as to suppression
The effect of resistance variations processed, it is possible to inhibit temperature drift to a certain extent.When the pressure is exerted, as can be seen from Figure 4
The difference of molecule denominator can be increasing, i.e. R values (R=(R4*R4 ')/(R4+R4 ')) variation is accelerated, and causes electric bridge more uneven
Weighing apparatus, output signal amount increase.Namely improve the sensitivity of pressure sensitive.
In addition, as shown in table 1：
| Variation | Series connection | It is in parallel |
| 0.1 | 4.1 | 2.05 |
| 0.2 | 4.2 | 2.1 |
| 0.3 | 4.3 | 2.15 |
| 0.4 | 4.4 | 2.2 |
| 0.5 | 4.5 | 2.25 |
In table 1, first row refers to the situation of change of temperature drift, and secondary series is referred to when resistance is connected to temperature drift
The reflection of variation, third row refer to the reflection changed during resistor coupled in parallel to temperature drift, for example temperature drift 0.1 is Celsius
Degree, then corresponding, resistance is exactly that output voltage has changed 0.1V to the reflection of temperature drift when connecting, and during resistor coupled in parallel pair
The reflection of temperature drift is that output voltage has changed 0.05V.Therefore, temperature drift can be carried out by the way of in parallel effective
Inhibit.
Claims (5)
1. a kind of pressure touching control circuit, which is characterized in that including four branches, described four branches form electric bridge, and wherein
Three branch roads are respectively equipped with conventional, electric-resistance R1, R2, R3, and the 4th branch road is equipped with two varistors R4 and R4 ', pressure-sensitive electricity
It is in parallel to hinder R4 and R4 '.
2. a kind of touch screen, which is characterized in that including pressure touching control circuit described in claim 1.
3. touch screen according to claim 2, which is characterized in that the varistor is placed on the AA areas of touch screen；
Conventional, electric-resistance R1, R2, R3 are placed on the border areas of touch screen.
4. the touch screen according to Claims 2 or 3, which is characterized in that the varistor is " L " type.
5. a kind of display equipment, which is characterized in that including claim 2~4 any one of them touch screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721383815.8U CN207601766U (en) | 2017-10-25 | 2017-10-25 | Pressure touching control circuit, touch screen and display equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721383815.8U CN207601766U (en) | 2017-10-25 | 2017-10-25 | Pressure touching control circuit, touch screen and display equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207601766U true CN207601766U (en) | 2018-07-10 |
Family
ID=62755854
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721383815.8U Expired - Fee Related CN207601766U (en) | 2017-10-25 | 2017-10-25 | Pressure touching control circuit, touch screen and display equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207601766U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855078A (en) * | 2020-07-28 | 2020-10-30 | 中国电子科技集团公司第四十八研究所 | Automatic zero point adjusting circuit and method for bridge force measuring sensor |
-
2017
- 2017-10-25 CN CN201721383815.8U patent/CN207601766U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855078A (en) * | 2020-07-28 | 2020-10-30 | 中国电子科技集团公司第四十八研究所 | Automatic zero point adjusting circuit and method for bridge force measuring sensor |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180710 Termination date: 20181025 |
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| CF01 | Termination of patent right due to non-payment of annual fee |