CN110275642B - Eight-wire type touch screen and touch screen calibration method - Google Patents
Eight-wire type touch screen and touch screen calibration method Download PDFInfo
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- CN110275642B CN110275642B CN201910689706.6A CN201910689706A CN110275642B CN 110275642 B CN110275642 B CN 110275642B CN 201910689706 A CN201910689706 A CN 201910689706A CN 110275642 B CN110275642 B CN 110275642B
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- 238000000034 method Methods 0.000 title claims description 13
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 116
- 238000005259 measurement Methods 0.000 claims abstract description 50
- 229910052709 silver Inorganic materials 0.000 claims description 60
- 239000004332 silver Substances 0.000 claims description 60
- 239000011521 glass Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 238000003466 welding Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
Abstract
The invention relates to the technical field of touch screen calibration, and discloses an eight-wire type touch screen which comprises an ITO conductive upper layer and an ITO conductive lower layer, wherein an upper silver wire is connected to the ITO conductive upper layer in a pressure welding mode, a lower silver wire is connected to the ITO conductive lower layer in a pressure welding mode, the upper silver wire is connected with a control circuit board through an upper voltage control wire and an upper voltage measurement wire respectively, the lower silver wire is connected with the control circuit board through a lower voltage control wire and a lower voltage measurement wire respectively, the upper voltage control wire is connected to the middle of the upper silver wire, the upper voltage measurement wire is connected to the end of the upper silver wire, the lower voltage control wire is connected to the middle of the lower silver wire, and the lower voltage measurement wire is connected to the end of the lower silver wire. The invention has the technical effects of small voltage deviation of the touch screen and high calibration precision.
Description
Technical Field
The invention relates to the technical field of touch screen calibration, in particular to an eight-wire type touch screen and a touch screen calibration method.
Background
The four-wire touch screen can drift when being used for a long time in fatigue or in severe environments because the conductive layer on the ITO film of the touch screen is gradually worn so that the resistance of a place where the touch screen is frequently touched becomes large, and the resistance of a conductive circuit which is touched becomes large under the influence of environmental conditions, particularly the change of temperature and humidity for a long time. The method adopted in the industry at present is that after the touch screen is used for a period of time and the deviation of positioning is found, the touch screen is calibrated irregularly under the guidance of software in a manual mode. However, for users in the high-end field, the manual calibration method cannot play a role in preventing the problems, wastes time of the users and cannot guarantee the calibration precision.
Disclosure of Invention
The invention aims to overcome the technical defects, and provides an eight-wire type touch screen and a touch screen calibration method, which solve the technical problem of low calibration precision in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention provides an eight-wire touch screen, which comprises an ITO conductive upper layer and an ITO conductive lower layer, wherein an upper-layer silver wire is connected to the ITO conductive upper layer in a pressure-bonding manner, a lower-layer silver wire is connected to the ITO conductive lower layer in a pressure-bonding manner, the upper-layer silver wire is connected with a control circuit board through an upper-layer voltage control wire and an upper-layer voltage measurement wire respectively, the lower-layer silver wire is connected with the control circuit board through a lower-layer voltage control wire and a lower-layer voltage measurement wire respectively, the upper-layer voltage control wire is connected to the middle part of the upper-layer silver wire, the upper-layer voltage measurement wire is connected to the end part of the upper-layer silver wire, the lower-layer voltage control wire is connected to the middle part of the lower-layer silver wire, and the lower-layer voltage measurement wire is connected to the end part of the lower-layer silver wire.
The invention also provides a touch screen calibration method, which is realized by adopting the eight-line touch screen, and comprises the following steps:
Selecting a plurality of pairs of calibration point pairs which are symmetrical with respect to the upper layer symmetry axis by taking a connecting line of the midpoints of the two upper layer silver wires as the upper layer symmetry axis;
Selecting a plurality of pairs of calibration point pairs which are symmetrical with respect to a lower-layer symmetry axis by taking a connecting line of the midpoints of the two lower-layer silver wires as the lower-layer symmetry axis;
And calibrating the touch screen according to each calibration point pair.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the upper voltage measuring line and the lower voltage measuring line are additionally arranged, so that the voltage measurement of the ITO conductive upper layer and the ITO conductive lower layer is realized, the control voltage is calibrated and corrected according to the measured voltage, and the automatic calibration of the touch screen is realized. Meanwhile, the upper voltage measuring wire is connected to the end part of the upper silver wire, and the lower voltage measuring wire is connected to the end part of the lower silver wire, so that the influence of the resistance of the upper silver wire and the resistance of the lower silver wire on the measured voltage is considered as much as possible, and accurate measurement is realized; the upper voltage control line is connected to the middle part of the upper silver line, and the lower voltage control line is connected to the middle part of the lower silver line, so that the influence of the resistance of the upper silver line and the resistance of the lower silver line on the control voltage is reduced as much as possible, and accurate control is realized; finally, the technical effects of reducing the deviation of the touch screen and improving the calibration precision of the touch screen are achieved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an ITO conductive top layer of an eight-wire touch screen according to the present invention;
fig. 2 is a schematic structural diagram of an embodiment of an ITO conductive underlayer of an eight wire touch screen provided by the present invention.
Reference numerals:
1. an ITO conductive upper layer, 11, an upper silver wire, 2, an ITO conductive lower layer, 21 and a lower silver wire.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1 and 2, embodiment 1 of the present invention provides an eight-wire touch screen, which includes an ITO conductive upper layer 1 and an ITO conductive lower layer 2, wherein an upper silver wire 11 is crimped on the ITO conductive upper layer 1, a lower silver wire 21 is crimped on the ITO conductive lower layer 2, the upper silver wire 11 is connected with a control circuit board through an upper voltage control wire and an upper voltage measurement wire, the lower silver wire 21 is connected with the control circuit board through a lower voltage control wire and a lower voltage measurement wire, the upper voltage control wire is connected with the middle part of the upper silver wire 11, the upper voltage measurement wire is connected with the end part of the upper silver wire 11, the lower voltage control wire is connected with the middle part of the lower silver wire 21, and the lower voltage measurement wire is connected with the end part of the lower silver wire 21.
The ITO conductive upper layer 1 is added with a silver wire outgoing line, namely an upper voltage measuring line, and is connected to a control circuit board, namely the ITO conductive upper layer 1 is provided with the upper voltage measuring line and the upper voltage control line which are connected with the control circuit board. In the operating state of the touch screen, voltage is applied to the upper voltage control line through the control circuit board, meanwhile, voltage is measured from the upper voltage measurement line, as the upper silver line 11 has a certain voltage drop, the silver line has a certain resistance, the resistance is small but the voltage drop exists, the contact resistance among the ITO conductive upper layer 1, the upper silver line 11 and the ITO conductive upper and lower layers has resistance change after being used for a period of time, the resistance change can cause linear offset, the upper voltage measurement line added in the embodiment can detect changed voltage at any time, and the control circuit board controls the upper voltage control line voltage according to the measured voltage, so that the linear drift is corrected. The design characteristic of the silver wire circuit is as follows: the upper voltage measuring wire is led out from the end part of the upper silver wire 11 pressed on the ITO conductive upper layer 1, and the upper voltage control wire is led out from the middle part of the upper silver wire 11 pressed on the ITO conductive upper layer 1. The design has the advantages that the resistance of the upper layer silver wire 11 connected to the upper layer voltage control wire is smaller, the influence of the resistance of the upper layer silver wire 11 on the upper layer voltage control is reduced to a certain extent, the resistance of the upper layer silver wire 11 connected to the upper layer voltage measurement wire is larger, the influence of the resistance of the upper layer silver wire 11 on the upper layer voltage measurement is considered more comprehensively to a certain extent, the measurement precision and the control precision of the voltage are higher, the use deviation of the touch screen is reduced, and the calibration precision is improved.
Similarly, a silver wire outgoing line, namely a lower voltage measuring line, is added on the ITO conductive lower layer 2 and is connected to the control circuit board, namely the ITO conductive lower layer 2 is provided with the lower voltage measuring line and the lower voltage control line which are connected with the control circuit board. In the operating state of the touch screen, voltage is applied to the lower voltage control line through the control circuit board, meanwhile, voltage is measured from the lower voltage measurement line, as the lower silver line 21 has a certain voltage drop, the silver line has a certain resistance, the resistance is small but the voltage drop exists, the contact resistance among the ITO conductive lower layer 2, the lower silver line 21 and the ITO conductive upper and lower layers has resistance change after being used for a period of time, the resistance change can cause linear offset, the lower voltage measurement line added in the embodiment can detect changed voltage at any time, and the control circuit board controls the voltage on the lower voltage control line according to the measured voltage, so that the linear drift is corrected. The design characteristic of the silver wire circuit is as follows: the lower voltage measurement line is led out from the end part of the lower silver wire 21 pressed on the ITO conductive lower layer 2, and the lower voltage control line is led out from the middle part of the lower silver wire 21 pressed on the ITO conductive lower layer 2. The priority of this design is to make the resistance of the lower layer silver wire 21 connected to the lower layer voltage control wire smaller, reducing the influence of the resistance of the lower layer silver wire 21 on the lower layer voltage control to some extent; the lower-layer silver wire 21 connected to the lower-layer voltage measuring wire is larger in resistance, the influence of the resistance of the lower-layer silver wire 21 on the lower-layer voltage measurement is considered more comprehensively to a certain extent, and therefore the voltage measuring precision and the control precision are higher, the using deviation of the touch screen is reduced, and the calibration precision is improved.
Since the present invention increases the upper and lower measurement voltage lines, the linear offset can be automatically calibrated according to the measurement voltage. Meanwhile, through the arrangement of the leading-out positions of the upper voltage measuring line, the upper voltage control line, the lower voltage measuring line and the lower voltage control line, the use deviation of the touch screen is reduced, and the calibration accuracy of the touch screen is improved.
Preferably, as shown in fig. 1 and 2, the upper voltage control line is connected to a midpoint of the upper silver line 11, the upper voltage measurement line is connected to an end of the upper silver line 11, the lower voltage control line is connected to a midpoint of the lower silver line 21, and the lower voltage measurement line is connected to an end of the lower silver line 21.
The upper voltage control line is led out from the middle point of the upper silver line 11, and the lower voltage control line is led out from the middle point of the lower silver line 21, so that the influence of the resistance of the upper silver line 11 and the resistance of the lower silver line 21 on the control voltage is reduced to the greatest extent, namely, the resistance at the middle point is minimum, the generated voltage drop is minimum, and the influence of the control voltage on the silver line is the lowest. The upper voltage measuring line is led out from the end point of the upper silver line 11, and the lower voltage measuring line is led out from the end point of the lower silver line 21, so that the influence of the resistance of the upper silver line 11 and the resistance of the lower silver line 21 on the measured voltage is comprehensively considered, and the influence of the whole silver line on the voltage is considered, so that the measured voltage is closer to a real value.
Preferably, as shown in fig. 1 and 2, the number of the upper silver wires 11 is two, the upper voltage control wires are two and are in one-to-one correspondence with the two upper silver wires 11, one ends of the two upper voltage control wires are respectively connected with the midpoints of the corresponding upper silver wires 11, the number of the upper voltage measurement wires is two and are in one-to-one correspondence with the two upper silver wires 11, and one ends of the two upper voltage measurement wires are respectively connected with the corresponding end points of the upper silver wires 11;
the number of the lower-layer silver wires 21 is two, the number of the lower-layer voltage control wires is two, the lower-layer voltage control wires are in one-to-one correspondence with the two lower-layer silver wires 21, one ends of the two lower-layer voltage control wires are respectively connected with the midpoints of the corresponding lower-layer silver wires 21, the number of the lower-layer voltage measurement wires is two, the lower-layer voltage measurement wires are in one-to-one correspondence with the two lower-layer silver wires 21, and one ends of the two lower-layer voltage measurement wires are respectively connected with the corresponding endpoints of the lower-layer silver wires 21.
The control and measurement of the voltage is achieved by two wires. Specifically, in fig. 1 and 2, two upper layer voltage control lines are respectively X-drive and x+drive, and two upper layer voltage measurement lines are respectively x+sense and X-sense; the two lower voltage control lines are Y+drive and Y-drive respectively, and the two lower voltage measurement lines are Y+sense and Y-sense respectively.
Preferably, as shown in fig. 1 and 2, the ITO conductive upper layer 1 and the ITO conductive lower layer 2 are rectangular, two upper silver wires 11 are respectively disposed on two opposite sides of the ITO conductive upper layer 1, and two lower silver wires 21 are respectively disposed on two opposite sides of the ITO conductive lower layer 2.
Rectangular touch screens are a more common arrangement.
Preferably, the two upper layer voltage control lines, the two upper layer voltage measurement lines, the two lower layer voltage control lines and the two lower layer voltage measurement lines are respectively connected with the control circuit board through the flexible circuit board.
The touch screen is connected with the control circuit board through the flexible circuit board.
Preferably, the ITO conductive upper layer 1 is an ITO conductive film, and the ITO conductive lower layer 2 is an ITO conductive glass.
Preferably, the control circuit board is a control circuit board of a mobile phone.
Example 2
Embodiment 2 of the present invention provides a touch screen calibration method implemented by using the eight-wire touch screen provided in embodiment 1, the calibration method including the following steps:
selecting a plurality of pairs of calibration point pairs which are symmetrical about the upper layer symmetry axis by taking a connecting line of the midpoints of the two upper layer silver wires 11 as the upper layer symmetry axis;
Selecting a plurality of pairs of calibration point pairs which are symmetrical about the lower-layer symmetry axis by taking the connecting line of the midpoints of the two lower-layer silver wires 21 as the lower-layer symmetry axis;
And calibrating the touch screen according to each calibration point pair.
Because the leading-out points of the two upper voltage control lines are respectively arranged at the middle points of the upper silver lines 11, the current distribution on the whole working surface is axisymmetric with the connecting line of the middle points of the upper silver lines 11, and therefore, the positions of the calibration points can be conveniently set due to the symmetric relation when the screen is set. Similarly, since the leading-out points of the two lower voltage control lines are respectively arranged at the middle points of the lower silver lines 21, the current distribution on the whole working surface is axisymmetric with the connecting line of the middle points of the lower silver lines 21, and thus, the positions of the calibration points can be conveniently set due to the symmetric relation when the screen is set.
The touch screen calibration method provided in this embodiment is based on the above-mentioned eight-wire touch screen, and therefore, the technical effects of the above-mentioned eight-wire touch screen are similar to those of the above-mentioned eight-wire touch screen, and the touch screen calibration method is not described in detail herein.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (7)
1. The eight-wire touch screen is characterized by comprising an ITO conductive upper layer and an ITO conductive lower layer, wherein an upper silver wire is crimped on the ITO conductive upper layer, a lower silver wire is crimped on the ITO conductive lower layer, the upper silver wire is connected with a control circuit board through an upper voltage control wire and an upper voltage measurement wire respectively, the lower silver wire is connected with the control circuit board through a lower voltage control wire and a lower voltage measurement wire respectively, the upper voltage control wire is connected with the middle part of the upper silver wire, the upper voltage measurement wire is connected with the end part of the upper silver wire, the lower voltage control wire is connected with the middle part of the lower silver wire, and the lower voltage measurement wire is connected with the end part of the lower silver wire; the upper layer voltage control line is connected to the midpoint of the upper layer silver line, the upper layer voltage measurement line is connected to the endpoint of the upper layer silver line, the lower layer voltage control line is connected to the midpoint of the lower layer silver line, and the lower layer voltage measurement line is connected to the endpoint of the lower layer silver line.
2. The eight-wire touch screen according to claim 1, wherein the number of the upper-layer silver wires is two, the number of the upper-layer voltage control wires is two, the upper-layer voltage control wires are in one-to-one correspondence with the two upper-layer silver wires, one ends of the two upper-layer voltage control wires are respectively connected with midpoints of the corresponding upper-layer silver wires, the number of the upper-layer voltage measurement wires is two, the upper-layer voltage measurement wires are in one-to-one correspondence with the two upper-layer silver wires, and one ends of the two upper-layer voltage measurement wires are respectively connected with end points of the corresponding upper-layer silver wires;
the lower-layer silver wires are two, the lower-layer voltage control wires are two and correspond to the lower-layer silver wires one by one, one end of each lower-layer voltage control wire is connected with the middle point of the corresponding lower-layer silver wire, the lower-layer voltage measurement wires are two and correspond to the lower-layer silver wires one by one, and one end of each lower-layer voltage measurement wire is connected with the corresponding end point of each lower-layer silver wire.
3. The eight wire touch screen of claim 2, wherein the ITO conductive upper layer and the ITO conductive lower layer are rectangular, two of the upper layer silver wires are respectively disposed on two opposite sides of the ITO conductive upper layer, and two of the lower layer silver wires are respectively disposed on two opposite sides of the ITO conductive lower layer.
4. The eight wire touch screen of claim 2, wherein two upper voltage control wires, two upper voltage measurement wires, two lower voltage control wires, and two lower voltage measurement wires are each connected to the control circuit board by a flexible circuit board.
5. The eight wire touch screen of claim 1, wherein the ITO conductive upper layer is an ITO conductive film and the ITO conductive lower layer is an ITO conductive glass.
6. The eight wire touch screen of claim 1, wherein the control circuit board is a control circuit board of a cell phone.
7. A method of calibrating a touch screen, implemented using an eight wire touch screen according to any of claims 2-6, the method comprising the steps of:
Selecting a plurality of pairs of calibration point pairs which are symmetrical with respect to the upper layer symmetry axis by taking a connecting line of the midpoints of the two upper layer silver wires as the upper layer symmetry axis;
Selecting a plurality of pairs of calibration point pairs which are symmetrical with respect to a lower-layer symmetry axis by taking a connecting line of the midpoints of the two lower-layer silver wires as the lower-layer symmetry axis;
And calibrating the touch screen according to each calibration point pair.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910689706.6A CN110275642B (en) | 2019-07-29 | 2019-07-29 | Eight-wire type touch screen and touch screen calibration method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910689706.6A CN110275642B (en) | 2019-07-29 | 2019-07-29 | Eight-wire type touch screen and touch screen calibration method |
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| CN110275642A CN110275642A (en) | 2019-09-24 |
| CN110275642B true CN110275642B (en) | 2024-05-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2085861A1 (en) * | 2008-01-29 | 2009-08-05 | Research In Motion Limited | Electronic device and touch screen display |
| CN107479778A (en) * | 2017-09-26 | 2017-12-15 | 黄石瑞视光电技术股份有限公司 | G+G structure four-wire resistance type touch screens |
| CN207182258U (en) * | 2017-09-26 | 2018-04-03 | 黄石瑞视光电技术股份有限公司 | G+G structure four-wire resistance type touch screens |
| CN207882879U (en) * | 2018-03-20 | 2018-09-18 | 黄石瑞视光电技术股份有限公司 | A kind of large scale touch screen |
| CN209911949U (en) * | 2019-07-29 | 2020-01-07 | 黄石瑞视光电技术股份有限公司 | Eight-wire touch screen |
-
2019
- 2019-07-29 CN CN201910689706.6A patent/CN110275642B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2085861A1 (en) * | 2008-01-29 | 2009-08-05 | Research In Motion Limited | Electronic device and touch screen display |
| CN107479778A (en) * | 2017-09-26 | 2017-12-15 | 黄石瑞视光电技术股份有限公司 | G+G structure four-wire resistance type touch screens |
| CN207182258U (en) * | 2017-09-26 | 2018-04-03 | 黄石瑞视光电技术股份有限公司 | G+G structure four-wire resistance type touch screens |
| CN207882879U (en) * | 2018-03-20 | 2018-09-18 | 黄石瑞视光电技术股份有限公司 | A kind of large scale touch screen |
| CN209911949U (en) * | 2019-07-29 | 2020-01-07 | 黄石瑞视光电技术股份有限公司 | Eight-wire touch screen |
Non-Patent Citations (1)
| Title |
|---|
| "触摸屏的光学和电子测试技术研究及讨论";郑巍;《中国优秀硕士学位论文全文数据库 信息科技辑》;第20-26、71-72页 * |
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