CN102819359A - Capacitive touch screen and touch device with same - Google Patents
Capacitive touch screen and touch device with same Download PDFInfo
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- CN102819359A CN102819359A CN201110152628XA CN201110152628A CN102819359A CN 102819359 A CN102819359 A CN 102819359A CN 201110152628X A CN201110152628X A CN 201110152628XA CN 201110152628 A CN201110152628 A CN 201110152628A CN 102819359 A CN102819359 A CN 102819359A
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Abstract
The invention discloses a capacitive touch screen which comprises a transparent substrate, a plurality of first parts, a plurality of second parts and one or multiple pad structures. The first parts are arranged in parallel on the transparent substrate at intervals. The second parts are arranged in parallel and at intervals. The second parts and the first parts form preset angles. Part of each second part forms mutual capacitance with part of the first part adjacent to the second part. The one or multiple pad structures are formed between the first parts and the second parts. The pad structures are conductive so that variation in the mutual capacitance between the first parts and the second parts before and after touch is increased. By the aid of the one or multiple pad structures added to the capacitive touch screen, adjustable range of the mutual capacitance values can be enlarged, quantity of finger negative charges absorbed by an exciting part is increased, and variation in the mutual capacitance is increased.
Description
Technical field
The present invention relates to the touch technology field, particularly a kind of improved capacitance touch screen and have the contactor control device of this capacitance touch screen.
Background technology
Along with the progress of science and technology, the mutual capacitance type touch-screen more and more widely be applied to various device, for example: fields such as handset touch panel, notebook touchpad, PDA, keyboard.Form the mutual capacitance structure between driver unit (TX) and the detection part (RX), during when the finger contact or near screen, driver unit (TX) can absorb the negative charge on the finger; The negative charge of respective absorption detection part (RX) can reduce, so the mutual capacitance meeting diminishes the employing signal detection technique; Convert the small capacitance variable quantity to linear with it d. c. voltage signal output; Handle through microcomputer, confirm the accurate coordinate of conductor on touch-screen, realize man-machine conversation and exchange.
Fig. 1 is the planimetric map of existing double-deck mutual capacitance type printed circuit board arrangement.Vertically black bar is the detection part 200 ' (RX) of top layer, laterally is driver unit 100 ' (TX), and the two is vertical each other.When touching object (like finger) not during touch screen, the negative charge of driver unit 100 ' main absorption detecting parts 200 ', both capacitances of formation are C1.When touching object (like finger) touch screen; Because a big chunk driver unit 100 ' distance signal detection part 200 ' is far away and point nearer; Therefore can transfer to absorb the negative charge on the finger; Correspondingly the electric charge of detection part 200 ' will reduce, so the mutual capacitance meeting that forms between signal detecting part 200 ' and the driver unit 100 ' reduces.Through the size of relevant detection electric circuit inspection mutual capacitance variable quantity, can judge whether contact is effective contact, and can calculate the coordinate of finger on screen through corresponding calculation method, realize the location.Shown in Fig. 2 a and 2b, be the positive charge and the negative charge distribution schematic diagram of existing capacitance touch screen.As can be seen from the figure; When finger 300 ' touched touch-screen, finger 300 ' can provide more negative charge, so driver unit 100 ' can fill into more positive charge; But because distance relation; From detection part 200 ' far away what partially absorb is the negative charge of finger, so the negative charge that detection part 200 ' provides has tailed off (mutual capacitance diminishes), finger provides more negative charge (it is big that self-capacitance becomes).
Arrangement according to driver unit and detection part can be divided into individual layer, bilayer even multilayer to mutual capacitance.According to considerations such as costs, single layer structure will become the main cabling mode of mutual capacitance touchscreens.Yet among single layer structure, driver unit and detection part distance are very near, so mutual capacitance is very big, thereby cause the mutual capacitance variable quantity very little, reach the flying method level, therefore cause effectively detecting capacitance change.
Summary of the invention
The object of the invention is intended to solve at least one of above-mentioned technological deficiency, particularly solves the defective that can't effectively detect capacitance change.
For achieving the above object, first aspect present invention proposes a kind of capacitance touch screen, comprising: transparency carrier; A plurality of first parts, said a plurality of first parts are parallel and turn up the soil at interval and be located on the said transparency carrier; With a plurality of second parts; Parallel and the spaced apart setting of said a plurality of second parts; Said a plurality of second parts become predetermined angular with said a plurality of first parts, and the part of the part of each said second parts and adjacent said first parts constitutes mutual capacitance each other; And being formed on one or more levels chinampa structure between said a plurality of first parts and a plurality of second parts, said one or more levels chinampa structure is that conductor is to increase the variable quantity that touches mutual capacitance between said first parts in front and back and second parts.In one embodiment of the invention, said first parts are driver unit, and said second parts are detection part.
According to the capacitance touch screen of the embodiment of the invention, can increase the adjustable extent of mutual capacitance appearance value through one or more levels chinampa structure that increases, increase the quantity of electric charge that driver unit absorbs the finger negative charge, thereby the variable quantity of mutual capacitance is increased.Therefore the chinampa structure through the embodiment of the invention can solve the little problem of finger touch front and back capacitance variations under the mutual capacitance individual layer cabling situation.In addition, in an embodiment of the present invention, the progression of chinampa structure (being number) is adjustable, therefore can make the appearance value reach the scope of being convenient to input through the progression of regulating the chinampa structure.And, in embodiments of the present invention, because the increase of chinampa structure can increase the distance between first parts and second parts, thereby can under the identical situation of chip I/O interface quantity, can widen whole screen.
Second aspect present invention proposes a kind of contactor control device, comprising: touch-screen, said touch-screen are according to the described capacitance touch screen of first aspect present invention; The one I/O interface group, each the I/O interface in the said I/O interface group links to each other with said first parts; The 2nd I/O interface group, each the I/O interface in said the 2nd I/O interface group links to each other with one group of second parts; And controller, said controller links to each other with the 2nd I/O interface group with a said I/O interface group respectively, detects the position that said touch-screen is touched according to the variable quantity of mutual capacitance between said first parts and said second parts.
Aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize through practice of the present invention.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously with easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the planimetric map of existing double-deck mutual capacitance type printed circuit board arrangement;
Fig. 2 a and 2b are the positive charge and the negative charge distribution schematic diagram of existing capacitance touch screen;
Fig. 3 a-3c is the synoptic diagram that between parallel plate capacitor, increases conductor;
Fig. 4 a and 4b are the positive charge and the negative charge distribution schematic diagram of the double-layer capacitance touch-screen of the embodiment of the invention with chinampa structure;
Fig. 5 is the positive charge and the negative charge distribution schematic diagram of the individual layer capacitance touch screen with chinampa structure of the embodiment of the invention;
Fig. 6 is the synoptic diagram that in the individual layer capacitance touch screen, increases the chinampa structure of the embodiment of the invention;
Fig. 7 is the synoptic diagram that in the individual layer capacitance touch screen, increases the chinampa structure of one embodiment of the invention;
Fig. 8 is the synoptic diagram that in the individual layer capacitance touch screen, increases the chinampa structure of another embodiment of the present invention; With
Fig. 9 is the contactor control device structural drawing of the embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, the example of said embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment that is described with reference to the drawings below, only be used to explain the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention; It will be appreciated that; Term " vertically ", " laterally ", " on ", the orientation of indications such as D score, " preceding ", " back ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward " or position relation be for based on orientation shown in the drawings or position relation; Only be to describe with simplifying for the ease of describing the present invention; Rather than the device or the element of indication or hint indication must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.
In description of the invention, need to prove, unless otherwise prescribed and limit; Term " installation ", " linking to each other ", " connection " should be done broad understanding, for example, can be mechanical connection or electrical connection; Also can be the connection of two element internals, can be directly to link to each other, and also can link to each other indirectly through intermediary; For those of ordinary skill in the art, can understand the concrete implication of above-mentioned term as the case may be.
Capacitance touch screen according to the embodiment of the invention comprises transparency carrier, a plurality of first parts and a plurality of second parts.Parallel and the compartment of terrain of a plurality of first parts is located on the transparency carrier.Parallel and the spaced apart setting of a plurality of second parts, a plurality of second parts become predetermined angular with a plurality of first parts, and the part of the part of each second parts and adjacent first parts constitutes electric capacity each other.This capacitance touch screen also comprises one or more levels chinampa structure that is formed between said a plurality of first parts and a plurality of second parts, and wherein, one or more levels chinampa structure is that conductor is to increase the variable quantity of mutual capacitance between said first parts and second parts.In one embodiment of the invention, first parts are driver unit, and said second parts are detection part.
In one embodiment of the invention, one or more levels chinampa structure is tin indium oxide (ITO).
In one embodiment of the invention, capacitance touch screen is a single layer structure, and first parts and second parts are positioned at same plane, and first parts or second parts break off at first parts and the second parts intersection, and the part connection that will break off through wire jumper.
In one embodiment of the invention, have the gap between said first parts and said second parts, said one or more levels chinampa structure is arranged in the said gap.
In one embodiment of the invention, said capacitance touch screen is a double-decker, and said first parts and said second parts lay respectively at Different Plane.
In one embodiment of the invention; Said one or more levels chinampa structure is set in the plane under plane under said first parts and/or said second parts, perhaps in the glassy layer between said first parts and said second parts said one or more levels chinampa structure is set.
In one embodiment of the invention, first parts are vertical each other with said second parts.
In one embodiment of the invention, second parts comprise a plurality of signal enhancing portion, and said signal enhancing portion comprises a plurality of shape structures, and said one or more levels chinampa structure is arranged among said a plurality of the shape structures.
According to the capacitance touch screen of the embodiment of the invention, can increase the adjustable extent of mutual capacitance appearance value through one or more levels chinampa structure that increases, increase the quantity of electric charge that driver unit absorbs the finger negative charge, thus make touch before and after the variable quantity of mutual capacitance increase.Therefore the chinampa structure through the embodiment of the invention can solve the little problem of finger touch front and back capacitance variations under the mutual capacitance individual layer cabling situation.In addition, in an embodiment of the present invention, the progression of chinampa structure (being number) is adjustable, therefore can make the appearance value reach the scope of being convenient to input through the progression of regulating the chinampa structure.And, in embodiments of the present invention, because the increase of chinampa structure can increase the distance between first parts and second parts, thereby can under the identical situation of chip I/O interface quantity, can widen whole screen.
Shown in Fig. 3 a-3c, between parallel plate capacitor, increasing the synoptic diagram of conductor.Like Fig. 3 a, the two-plate area of supposing parallel plate capacitor is S, and spacing is d, the appearance value C=ε S/4K л d of this parallel plate capacitor.When inserting a conductor in the middle of the two-plate, and polar plate spacing is when constant, shown in Fig. 3 b.This moment capacity plate antenna appearance value C1=ε S/4K л (d1+d2); Because d " d1+d2 can draw C " C1 thus; According to above principle, can between the two poles of the earth of mutual capacitance TX and RX, fill chinampa structure (being conductor) thereby reach and make the mutual capacitance initial value become big purpose.Shown in Fig. 3 c, be the situation when increasing electric capacity two-plate distance and adding two independent conductors in the centre.Because the distance between the two-plate becomes big therefore electric capacity and can reduce; But the adding chinampa makes the appearance value of electric capacity become big later on again; Therefore can be through simulated experiment adjustment distance; The equilibrium point that finds electric capacity to increase and reduce, thus the appearance value of whole capacitor is adjusted to effective sensing range, improve the degree of accuracy that detects.
As shown in Figs. 4a and 4b, have the positive charge and the negative charge distribution schematic diagram of the double-layer capacitance touch-screen of chinampa structure for the embodiment of the invention.When TX 100 absorbed electric charges, chinampa structure 400 just can be used as the bridge between TX 100 and the RX 200, and the distance between TX 100 and the RX 200 that just equaled to further of the bridge joint through chinampa structure 400 becomes greatly the mutual capacitance between TX 100 and the RX 200.Most TX 100 when finger 300 touches because with the distance of finger 300 than near with the distance of RX 200; Therefore TX 100 can transfer to absorb the negative charge on the finger 300; So most negative charge is from finger 300; The electric charge that RX 200 provides is considerably less, so that mutual capacitance will become will be very little, thereby increases the changing value of mutual capacitance.
As shown in Figure 5, be the positive charge and the negative charge distribution schematic diagram of the individual layer capacitance touch screen with chinampa structure of the embodiment of the invention.One or more levels chinampa structure 400 is set in the gap between TX 100 and RX 200, on this individual layer capacitance touch screen, is provided with glass 500.
Below will be with the effect of the concrete detection evidence embodiment of the invention.Among this test, capacitance touch screen be provided with glass up and down, wherein the top layer thickness of glass is 0.9mm, the thickness of bottom glass is 0.4mm, it is the individual layer mutual capacitance touchscreens, the one-level chinampa.Wherein, under the situation of no chinampa structure, mutual capacitance appearance value is 1.0747 pico farads during no touch, and the mutual capacitance appearance value after finger effectively touches is 0.72554 pico farad.After adding the chinampa structure between TX and the RX, mutual capacitance appearance value is 1.6815 pico farads during no touch, and the mutual capacitance appearance value after finger effectively touches is 1.3189 pico farads.Can know by above data, between TX and RX, fill after the structure of chinampa, can increase mutual capacitance initial value and changing value, thereby be convenient to detect.
As shown in Figure 6, be the synoptic diagram that in the individual layer capacitance touch screen, increases the chinampa structure of the embodiment of the invention.Wherein, TX (driver unit) 100 and RX (detection part) 200 are positioned at same plane, and RX 200 breaks off in TX 100 and RX 200 intersections, and connect through the breaking part of wire jumper with RX 200.Certainly in other embodiments of the invention, also can be that TX 100 breaks off in TX 100 and RX 200 intersections, and breaking part connected through wire jumper.Between RX 200 and TX 100, have a plurality of gaps, in embodiments of the present invention, one or more levels chinampa structure 400 can be set within this gap.
As shown in Figure 7, be the synoptic diagram that in the individual layer capacitance touch screen, increases the chinampa structure of one embodiment of the invention.Wherein, TX 100 and RX 200 are positioned at different plane, and in this embodiment, one or more levels chinampa structure 400 is positioned at same plane with RX 200.Certainly in other embodiments of the invention, one or more levels chinampa structure 400 also can be positioned at same plane with TX 100, perhaps, and in the glassy layer of one or more levels chinampa structure 400 between TX 100 and RX200.In this embodiment, interlaced setting between a plurality of RX, thus can further improve the variable quantity of mutual capacitance, and under the identical situation of chip I/O interface quantity, can widen whole screen.
As shown in Figure 8, be the synoptic diagram that in the individual layer capacitance touch screen, increases the chinampa structure of another embodiment of the present invention.Wherein, TX 100 and RX 200 are positioned at different plane, in this embodiment; RX 200 also includes a plurality of signal enhancing portion; Each signal enhancing portion comprises a plurality of shape structures 700, and in this embodiment, one or more levels chinampa structure 400 is arranged among a plurality of the shape structures 700.Can further improve the variable quantity of mutual capacitance through a plurality of shape structures 700, increase the accuracy that detects.
The contactor control device of describing according to the embodiment of the invention with reference to figure 9 below.
As shown in Figure 9; Comprise capacitance touch screen that the above embodiment of the present invention provides 1, an I/O interface group 2, the 2nd I/O interface group 3 and controller 4 according to the contactor control device of the embodiment of the invention; Wherein each the I/O interface in the I/O interface group 2 links to each other with one first parts 100; Each I/O interface in the 2nd I/O interface group 3 links to each other with one group of second parts 200; Controller 4 links to each other with the 2nd I/O interface group 3 with a said I/O interface group 2 respectively, detects the position that said touch-screen is touched according to the variable quantity of mutual capacitance between first parts 100 and second parts 200.
When touching object (like finger) near capacitance touch screen 1, increased the specific inductive capacity between first parts 100 and second parts, 200 electric capacity, touch the electric capacity between front and back first parts 100 and second parts 200 thereby increased.Controller 4 is gathered the electric charge of first parts 100 and second parts 200 through an I/O interface group 2 and the 2nd I/O interface group 3; And calculating the variable quantity of the mutual capacitance between first parts 100 and second parts 200, the variable quantity according to mutual capacitance can calculate touch point and the touch action that touches object then.
In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means the concrete characteristic, structure, material or the characteristics that combine this embodiment or example to describe and is contained at least one embodiment of the present invention or the example.In this manual, the schematic statement to above-mentioned term not necessarily refers to identical embodiment or example.And concrete characteristic, structure, material or the characteristics of description can combine with suitable manner in any one or more embodiment or example.
Although illustrated and described embodiments of the invention; For those of ordinary skill in the art; Be appreciated that under the situation that does not break away from principle of the present invention and spirit and can carry out multiple variation, modification, replacement and modification that scope of the present invention is accompanying claims and be equal to and limit to these embodiment.
Claims (10)
1. a capacitance touch screen is characterized in that, comprising:
Transparency carrier;
A plurality of first parts, said a plurality of first parts are parallel and turn up the soil at interval and be located on the said transparency carrier; With
A plurality of second parts; Parallel and the spaced apart setting of said a plurality of second parts; Said a plurality of second parts become predetermined angular with said a plurality of first parts, and the part of the part of each said second parts and adjacent said first parts constitutes mutual capacitance each other; With
Be formed on one or more levels chinampa structure between said a plurality of first parts and a plurality of second parts, said one or more levels chinampa structure is that conductor is to increase the variable quantity that touches mutual capacitance between said first parts in front and back and second parts.
2. capacitance touch screen according to claim 1 is characterized in that, said first parts are driver unit, and said second parts are detection part.
3. capacitance touch screen according to claim 1; It is characterized in that; Said capacitance touch screen is a single layer structure; And said first parts and said second parts are positioned at same plane, and said first parts or said second parts break off at said first parts and the said second parts intersection, and the part connection that will break off through wire jumper.
4. capacitance touch screen according to claim 3 is characterized in that, has the gap between said first parts and said second parts, and said one or more levels chinampa structure is arranged in the said gap.
5. capacitance touch screen according to claim 1 is characterized in that, said capacitance touch screen is a double-decker, and said first parts and said second parts lay respectively at Different Plane.
6. capacitance touch screen according to claim 5; It is characterized in that; Said one or more levels chinampa structure is set in the plane under plane under said first parts and/or said second parts, perhaps in the glassy layer between said first parts and said second parts said one or more levels chinampa structure is set.
7. capacitance touch screen according to claim 1 is characterized in that, said first parts are vertical each other with said second parts.
8. capacitance touch screen according to claim 1 is characterized in that, said one or more levels chinampa structure is tin indium oxide ITO.
9. capacitance touch screen according to claim 1 is characterized in that, said second parts comprise a plurality of signal enhancing portion, and said signal enhancing portion comprises a plurality of shape structures, and said one or more levels chinampa structure is arranged among said a plurality of the shape structures.
10. a contactor control device is characterized in that, comprising:
Touch-screen, said touch-screen are like each described capacitance touch screen of claim 1-9;
The one I/O interface group, each the I/O interface in the said I/O interface group links to each other with said first parts;
The 2nd I/O interface group, each the I/O interface in said the 2nd I/O interface group links to each other with one group of second parts; With
Controller, said controller link to each other with the 2nd I/O interface group with a said I/O interface group respectively, detect the position that said touch-screen is touched according to the variable quantity of mutual capacitance between said first parts and said second parts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110152628XA CN102819359A (en) | 2011-06-08 | 2011-06-08 | Capacitive touch screen and touch device with same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110152628XA CN102819359A (en) | 2011-06-08 | 2011-06-08 | Capacitive touch screen and touch device with same |
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| CN102819359A true CN102819359A (en) | 2012-12-12 |
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| CN201110152628XA Pending CN102819359A (en) | 2011-06-08 | 2011-06-08 | Capacitive touch screen and touch device with same |
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| CN103927060A (en) * | 2013-01-14 | 2014-07-16 | 上海海尔集成电路有限公司 | Capacitive touch control device and terminal |
| CN109564493A (en) * | 2016-07-19 | 2019-04-02 | 电子触控产品解决方案 | Projecting type capacitor (PCAP) touch screen |
| US11829183B2 (en) | 2016-07-19 | 2023-11-28 | Elo Touch Solutions, Inc. | Projected-capacitive (PCAP) touchscreen |
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Application publication date: 20121212 |