CN103019496A - Capacitive touch module, manufacturing method for same and capacitive touch screen panel - Google Patents
Capacitive touch module, manufacturing method for same and capacitive touch screen panel Download PDFInfo
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- CN103019496A CN103019496A CN2012105767701A CN201210576770A CN103019496A CN 103019496 A CN103019496 A CN 103019496A CN 2012105767701 A CN2012105767701 A CN 2012105767701A CN 201210576770 A CN201210576770 A CN 201210576770A CN 103019496 A CN103019496 A CN 103019496A
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Abstract
The invention discloses a capacitive touch module, a manufacturing method for the same and a capacitive touch screen panel. A substrate electrode layer insulated from a touch electrode layer and a metal layer is additionally arranged in the touch module, and is provided with a substrate electrode corresponding to the position of a channel region of the touch electrode layer. A refractive index difference caused by the channel region in the touch electrode layer can be compensated by the substrate electrode, and the appearance effect of the capacitive touch module is further improved.
Description
Technical field
The present invention relates to the touch technology field, relate in particular to a kind of capacitance touching control module, its preparation method and capacitive touch screen.
Background technology
Along with the develop rapidly of display technique, touch-screen (Touch Screen Panel) spreads all in people's the life gradually.At present, touch-screen can be divided into according to principle of work: resistance-type, condenser type, infrared-type and surface acoustic wave type, electromagnetic type, ripple induction type and frustrated total internal reflection optical induction type etc. shake.Wherein, capacitive touch screen relies on the advantages such as high sensitivity, long-life, high transmission rate with its unique touch-control principle, is pursued in the industry to be the new lover.
Use at present more widely projecting type capacitor module; as shown in Figure 1; comprise successively: be formed on metal level (not shown in figure 1), insulation course, touch control electrode layer and protective seam on the underlay substrate; wherein; touch control electrode layer has the touch-control sensing electrode that intersects and put and the figure of touch-control drive electrode, has metal bridge and some metal routings by the adjacent touch-control drive electrode of the via hole bridge joint on the insulation course or adjacent touch-control sensing electrode on the metal level.Because therefore mutually insulated between touch-control sensing electrode and the touch-control drive electrode can be formed with channel region between the touch-control sensing electrode on the touch control electrode layer and touch-control drive electrode, this channel region can be insulated Material Filling.Because the insulating material generally refractive index with the electrode material for preparing touch control electrode layer is different, like this, the channel region that exists at touch control electrode layer can make the appearance effect variation of touch module, and, exist in the situation of larger difference △ T at the insulating material of channel region and the refractive index of electrode material (being generally the ITO material), this phenomenon is then particularly evident.
Summary of the invention
The embodiment of the invention provides a kind of capacitance touching control module, its preparation method and capacitive touch screen, in order to improve the appearance effect of capacitance touching control module.
A kind of capacitance touching control module that the embodiment of the invention provides, comprise touch control electrode layer, with the metal level of described touch control electrode layer insulation, described touch control electrode layer has touch-control sensing electrode and the touch-control drive electrode that intersects and put, and between touch-control sensing electrode and touch-control drive electrode, be formed with channel region, described metal level has the metal bridge of the adjacent described touch-control drive electrode of bridge joint or adjacent touch-control sensing electrode, also comprises:
Underlayer electrode layer with described touch control electrode layer and the insulation of described metal level, described underlayer electrode layer has the underlayer electrode corresponding to the position setting of the channel region of described touch control electrode layer, and described underlayer electrode is used for compensating the refractive index difference that described touch control electrode layer is caused by described channel region.
The embodiment of the invention also provides a kind of capacitive touch screen, comprises the above-mentioned capacitance touching control module that the embodiment of the invention provides.
The embodiment of the invention also provides a kind of preparation method of above-mentioned capacitance touching control module, comprising:
At underlay substrate preparation underlayer electrode layer, by the figure of a composition technique formation underlayer electrode;
Prepare metal level at underlay substrate, by the figure of a composition technique formation metal bridge;
Prepare touch control electrode layer at underlay substrate, form the figure of touch-control drive electrode and touch-control sensing electrode by a composition technique, and between touch-control sensing electrode and touch-control drive electrode, be formed with channel region;
Prepare insulation course at underlay substrate, make described underlayer electrode layer, metal level and touch control electrode layer mutually insulated;
Adjacent described touch-control drive electrode or adjacent touch-control sensing electrode are by described metal bridge bridge joint; The figure of described underlayer electrode is corresponding to the position of the channel region of described touch control electrode layer, and described underlayer electrode is used for the refractive index difference that compensation is caused by described channel region.
The beneficial effect of the embodiment of the invention comprises:
A kind of capacitance touching control module, its preparation method and capacitive touch screen that the embodiment of the invention provides, in touch module, increased the underlayer electrode layer of one deck and touch control electrode layer and metal level insulation, this underlayer electrode layer has the underlayer electrode corresponding to the position setting of the channel region of touch control electrode layer, because the refractive index difference that underlayer electrode is caused by channel region in can the compensating touch control electrode layer, and then improved the appearance effect of capacitance touching control module.
Description of drawings
Fig. 1 is the structural representation of capacitance touching control module in the prior art;
The preparation method's of the capacitance touching control module that Fig. 2 provides for the embodiment of the invention process flow diagram;
The vertical view that each rete of capacitance touching control module that Fig. 3 a-Fig. 3 e provides for the embodiment of the invention designs;
The STRUCTURE DECOMPOSITION synoptic diagram of the capacitance touching control module that Fig. 4 provides for the embodiment of the invention;
The structural representation of the capacitance touching control module that Fig. 5 provides for the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of capacitance touching control module, its preparation method and the capacitive touch screen that the embodiment of the invention is provided is described in detail.
Each layer film thickness and area size shape are not reacted the true ratio of each rete in the accompanying drawing, and purpose is signal explanation content of the present invention just.
A kind of capacitance touching control module that the embodiment of the invention provides, in the structure of existing projected capacitive touch module, to have added underlayer electrode, realized improving the purpose of the appearance effect of touch module, existing projected capacitive touch module specifically comprises: touch control electrode layer, metal level with the touch control electrode layer insulation, wherein, touch control electrode layer has touch-control sensing electrode and the touch-control drive electrode that intersects and put, and between touch-control sensing electrode and touch-control drive electrode, be formed with channel region, metal level has the metal bridge of the adjacent touch-control drive electrode of bridge joint or adjacent touch-control sensing electrode, in the structure of projected capacitive touch module, the present invention has also added following film layer structure:
With the underlayer electrode layer of touch control electrode layer and metal level insulation, this underlayer electrode layer has the underlayer electrode corresponding to the position setting of the channel region of touch control electrode layer, and this underlayer electrode is used for the refractive index difference that the compensating touch control electrode layer is caused by channel region.
In the specific implementation, the capacitance touching control module that the embodiment of the invention provides can directly be produced on the outermost layer substrate of display panel, substrate back such as the color membrane substrates of display panels also can be produced on the independent underlay substrate, does not do restriction at this.
Particularly; can find out the structure of the above-mentioned capacitance touching control module that provides from the embodiment of the invention; touch module comprises three main retes; be touch control electrode layer, metal level and underlayer electrode layer; because need insulation between 3 retes, therefore, touch module also comprises two insulation courses; and, generally also have the protective seam that the protection module is not affected by the external environment in the top of touch module.
In the specific implementation, hierarchical relationship between three main retes in the touch module can change flexibly, namely can be touch control electrode layer → metal level → underlayer electrode layer in the order of substrate preparation rete, also can for underlayer electrode layer → metal level → touch control electrode layer etc., no longer enumerate at this.
In the specific implementation, generally can use the material identical with touch control electrode layer to prepare the underlayer electrode layer, be normal operation ITO(Indium Tin Oxides, indium tin metal oxide) material or other transparent conductive materials, do not do restriction at this, like this, the thickness of two retes is set to identical, can reach the underlayer electrode of preparing and just in time produce refractive index difference by channel region in the compensating touch control electrode layer, reach the purpose of improving appearance effect.
Further, when concrete preparation touch control electrode layer and underlayer electrode layer, because the pattern of two retes is just in time opposite, therefore, can use same mask plate, use respectively positive photoresist and negative photoresist namely to can be made into the pattern of two retes, can save expensive mask plate like this, thereby on the basis of improving the touch module appearance effect, save the cost of manufacture of touch module.
At present, existing touch module is not having ad hoc structure, does not namely have in the situation of guarded electrode making, and the undesired signal that comes from the outside is all influential to IC performance and the signal to noise ratio (S/N ratio) of touch module.Experimental data shows when the outer rim of the close touch module of finger and metal is arranged, by testing software test induction electrode a newspaper point situation is arranged, and namely finger and metal pair induction electrode are noisy.And the above-mentioned capacitance touching control module that the embodiment of the invention provides in the specific implementation, can be arranged on the underlayer electrode layer bottom of capacitance touching control module, prevents the problem that outer signals is disturbed, and namely plays jamproof effect.
Accordingly, when the underlayer electrode layer in this capacitance touching control module was arranged on the bottom of capacitance touching control module, touch control electrode layer can be positioned at the top of metal level, and touch control electrode layer also can be positioned at the below of metal level certainly, does not do restriction at this.
In addition, in the specific implementation, the underlayer electrode layer can also be arranged at the top layer of capacitance touching control module.
Accordingly, when the underlayer electrode layer in this capacitance touching control module was arranged on the top layer of capacitance touching control module, touch control electrode layer can be positioned at the below of metal level, and touch control electrode layer also can be positioned at the top of metal level certainly, does not do restriction at this.
And, existing touch module generally all can have damage (NG) in various degree when the static of contact 14KV, antistatic effect is relatively poor, is not taking any antistatic (ESD) to improve in the measure situation, when contacting the static of 14KV, all can there be damage in various degree at metal bridge and via hole place.
Further, in the touch module that the embodiment of the invention provides, will can play anlistatig effect after the underlayer electrode ground connection.In the ESD test of after final module group assembling is complete, carrying out, no matter be the inner or outside frame of test touch module, underlayer electrode all can with the static very first time be transferred to ground (GND), can not damage touch electrode structure.
Based on same inventive concept, the embodiment of the invention also provides a kind of capacitive touch screen, comprises the above-mentioned capacitance touching control module that the embodiment of the invention provides, and the enforcement of this touch-screen can referring to the enforcement of touch module, repeat part and repeat no more.
The embodiment of the invention provides the preparation method that a kind of capacitance touching control module also is provided, and comprising:
At underlay substrate preparation underlayer electrode layer, by the figure of a composition technique formation underlayer electrode;
Prepare metal level at underlay substrate, by the figure of a composition technique formation metal bridge;
Prepare touch control electrode layer at underlay substrate, form the figure of touch-control drive electrode and touch-control sensing electrode by a composition technique, and between touch-control sensing electrode and touch-control drive electrode, be formed with channel region;
Prepare insulation course at underlay substrate, make described underlayer electrode layer, metal level and touch control electrode layer mutually insulated;
Adjacent described touch-control drive electrode or adjacent touch-control sensing electrode are by described metal bridge bridge joint; The figure of described underlayer electrode is corresponding to the position of the channel region of described touch control electrode layer, and described underlayer electrode is used for the refractive index difference that compensation is caused by described channel region.
In above-mentioned preparation method, do not specifically describe the order of each rete, sequentially as: underlayer electrode layer → metal level → touch control electrode layer as the example explanation, described preparation method comprises the below take the rete of touch module:
Prepare touch control electrode layer at underlay substrate, form the figure of touch-control drive electrode and touch-control sensing electrode by a composition technique, and between touch-control sensing electrode and touch-control drive electrode, be formed with channel region;
At described touch control electrode layer preparation the first insulation course;
Prepare metal level at described the first insulation course, by the figure of a composition technique formation metal bridge;
At described metal level preparation the second insulation course;
At described the second insulation course preparation underlayer electrode layer, by the figure of a composition technique formation underlayer electrode;
Adjacent described touch-control drive electrode or adjacent touch-control sensing electrode are by described metal bridge bridge joint; The figure of described underlayer electrode is corresponding to the position of the channel region of described touch control electrode layer, and described underlayer electrode is used for the refractive index difference that compensation is caused by described channel region.
As shown in Figure 2, the preparation method comprises following step:
S201, at underlay substrate preparation underlayer electrode layer 1, figure by a composition technique formation underlayer electrode 11, Fig. 3 a is the figure of the underlayer electrode 11 of formation, the general binding post PIN via hole 12 that also can form in the edge of underlayer electrode layer connection Bonding Pad;
S202, at underlayer electrode layer preparation the first insulation course 2, shown in Fig. 3 b, have the binding post PIN via hole 21 that connects Bonding Pad in the first insulation course, the binding post PIN via hole 12 that forms in the position of this binding post PIN via hole 21 and the underlayer electrode layer is relative;
Preferably, in the first insulation course, also has the binding post PIN via hole 22 that makes underlayer electrode ground connection;
S203, prepare metal level at the first insulation course, figure by a composition technique formation metal bridge 31, shown in Fig. 3 c, general also can form the binding post PIN 32 that connects Bonding Pad, the binding post PIN 33 that makes underlayer electrode ground connection in edge, and the connecting line 34 between each touch-control drive electrode and the touch-control sensing electrode in binding post PIN 32 and the touch control electrode layer that will form; Wherein, the binding post PIN via hole 12 that forms in the binding post PIN via hole 21 that forms in the position of binding post PIN 32 and the first insulation course and the underlayer electrode layer is relative, and the position of binding post PIN 33 is relative with the binding post PIN via hole 22 that the first insulation course forms;
S204, at metal level preparation the second insulation course, shown in Fig. 3 d, in the second insulation course, have metal bridge via hole 41, drive electrode via hole 42, induction electrode via hole 43, connect the binding post PIN via hole 44 of Bonding Pad;
Preferably, in the second insulation course, also has the binding post PIN via hole 45 that makes underlayer electrode ground connection;
S205, prepare touch control electrode layer at the second insulation course, form the figure of touch-control drive electrode 51 and touch-control sensing electrode 52 by composition technique, shown in Fig. 3 e, and between touch-control sensing electrode 52 and touch-control drive electrode 51, be formed with channel region; Adjacent touch-control drive electrode 51 or adjacent touch-control sensing electrode 52 are by the metal bridge bridge joint; The figure of underlayer electrode is corresponding to the position of the channel region of touch control electrode layer, and underlayer electrode is used for the refractive index difference that compensation is caused by channel region.
Preferably, after step S205, also can prepare protective seam at touch control electrode layer, prevent scratch with the protection touch module.
Fig. 4 is the STRUCTURE DECOMPOSITION synoptic diagram of each rete in the above-mentioned touch module, the pattern that can find out touch control electrode layer 5 and underlayer electrode layer 1 is just in time opposite, therefore in above-mentioned preparation process, can use same mask plate and opposite polarity photoresist respectively underlayer electrode layer 1 and touch control electrode layer 5 to be carried out composition among step S201 and the step S205, obtain respectively the figure of underlayer electrode, touch-control sensing electrode and touch-control drive electrode.And protective seam 6 is consistent with the pattern of the first insulation course 2 as can be seen from Figure 4, therefore in preparation process, can use same mask plate respectively protective seam 6 and described the first insulation course 2 to be carried out composition.
Except above-mentioned illustrational preparation method, described preparation method can also comprise:
Prepare touch control electrode layer at underlay substrate, form the figure of touch-control drive electrode and touch-control sensing electrode by a composition technique, and between touch-control sensing electrode and touch-control drive electrode, be formed with channel region;
At described touch control electrode layer preparation the first insulation course;
Prepare metal level at described the first insulation course, by the figure of a composition technique formation metal bridge;
At described metal level preparation the second insulation course;
At described the second insulation course preparation underlayer electrode layer, by the figure of a composition technique formation underlayer electrode;
Adjacent described touch-control drive electrode or adjacent touch-control sensing electrode are by described metal bridge bridge joint; The figure of described underlayer electrode is corresponding to the position of the channel region of described touch control electrode layer, and described underlayer electrode is used for the refractive index difference that compensation is caused by described channel region.
Those skilled in the art can know the preparation method of other rete orders by inference, are not giving unnecessary details at this.
Further, as shown in Figure 5, touch control electrode layer and the thickness of underlayer electrode layer can identical and all use such as the same material of ITO material and make in the preparation, and is identical with the refractive index of the touch module integral body that guarantees to complete, has good appearance effect.
A kind of capacitance touching control module, its preparation method and capacitive touch screen that the embodiment of the invention provides, in touch module, increased the underlayer electrode layer of one deck and touch control electrode layer and metal level insulation, this underlayer electrode layer has the underlayer electrode corresponding to the position setting of the channel region of touch control electrode layer, because the refractive index difference that underlayer electrode is caused by channel region in can the compensating touch control electrode layer, and then improved the appearance effect of capacitance touching control module.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (16)
1. capacitance touching control module, comprise touch control electrode layer, with the metal level of described touch control electrode layer insulation, described touch control electrode layer has touch-control sensing electrode and the touch-control drive electrode that intersects and put, and between touch-control sensing electrode and touch-control drive electrode, be formed with channel region, described metal level has the metal bridge of the adjacent described touch-control drive electrode of bridge joint or adjacent described touch-control sensing electrode, it is characterized in that, also comprise:
Underlayer electrode layer with described touch control electrode layer and the insulation of described metal level, described underlayer electrode layer has the underlayer electrode corresponding to the position setting of the channel region of described touch control electrode layer, and described underlayer electrode is used for compensating the refractive index difference that described touch control electrode layer is caused by described channel region.
2. capacitance touching control module as claimed in claim 1 is characterized in that, the thickness of described touch control electrode layer and described underlayer electrode layer is identical and be all the ITO electrode layer.
3. capacitance touching control module as claimed in claim 1 is characterized in that, described underlayer electrode layer is arranged at the bottom of described capacitance touching control module.
4. capacitance touching control module as claimed in claim 3 is characterized in that, described touch control electrode layer is positioned at the top of described metal level.
5. capacitance touching control module as claimed in claim 1 is characterized in that, described underlayer electrode layer is arranged at the top layer of described capacitance touching control module.
6. capacitance touching control module as claimed in claim 5 is characterized in that, described touch control electrode layer is positioned at the below of described metal level.
7. such as each described capacitance touching control module of claim 1-6, it is characterized in that described underlayer electrode ground connection.
8. a capacitive touch screen is characterized in that, comprises each described capacitance touching control module such as claim 1-7.
9. the preparation method of a capacitance touching control module is characterized in that, comprising:
At underlay substrate preparation underlayer electrode layer, by the figure of a composition technique formation underlayer electrode;
Prepare metal level at underlay substrate, by the figure of a composition technique formation metal bridge;
Prepare touch control electrode layer at underlay substrate, form the figure of touch-control drive electrode and touch-control sensing electrode by a composition technique, and between described touch-control sensing electrode and touch-control drive electrode, be formed with channel region;
Prepare insulation course at underlay substrate, make described underlayer electrode layer, metal level and touch control electrode layer mutually insulated;
Adjacent described touch-control drive electrode or adjacent touch-control sensing electrode are by described metal bridge bridge joint; The figure of described underlayer electrode is corresponding to the position of the channel region of described touch control electrode layer, and described underlayer electrode is used for the refractive index difference that compensation is caused by described channel region.
10. preparation method as claimed in claim 9 is characterized in that, comprising:
At underlay substrate preparation underlayer electrode layer, by the figure of a composition technique formation underlayer electrode;
At described underlayer electrode layer preparation the first insulation course;
Prepare metal level at described the first insulation course, by the figure of a composition technique formation metal bridge;
At described metal level preparation the second insulation course;
Prepare touch control electrode layer at described the second insulation course, form the figure of touch-control drive electrode and touch-control sensing electrode by a composition technique, and between touch-control sensing electrode and touch-control drive electrode, be formed with channel region; Adjacent described touch-control drive electrode or adjacent touch-control sensing electrode are by described metal bridge bridge joint; The figure of described underlayer electrode is corresponding to the position of the channel region of described touch control electrode layer, and described underlayer electrode is used for the refractive index difference that compensation is caused by described channel region.
11. preparation method as claimed in claim 9 is characterized in that, comprising:
Prepare touch control electrode layer at underlay substrate, form the figure of touch-control drive electrode and touch-control sensing electrode by a composition technique, and between touch-control sensing electrode and touch-control drive electrode, be formed with channel region;
At described touch control electrode layer preparation the first insulation course;
Prepare metal level at described the first insulation course, by the figure of a composition technique formation metal bridge;
At described metal level preparation the second insulation course;
At described the second insulation course preparation underlayer electrode layer, by the figure of a composition technique formation underlayer electrode;
Adjacent described touch-control drive electrode or adjacent touch-control sensing electrode are by described metal bridge bridge joint; The figure of described underlayer electrode is corresponding to the position of the channel region of described touch control electrode layer, and described underlayer electrode is used for the refractive index difference that compensation is caused by described channel region.
12. such as each described preparation method of claim 9-11, it is characterized in that, use same mask plate and opposite polarity photoresist respectively described underlayer electrode layer and described touch control electrode layer to be carried out composition.
13., it is characterized in that the thickness of described touch control electrode layer and underlayer electrode layer is identical and all use the ITO material to make such as each described preparation method of claim 9-11.
14., it is characterized in that described the first insulation course and described the second insulation course all have the binding post PIN via hole that makes described underlayer electrode ground connection such as each described preparation method of claim 9-11.
15. such as each described preparation method of claim 9-11, it is characterized in that, also comprise: prepare protective seam at described touch control electrode layer.
16. preparation method as claimed in claim 15 is characterized in that, uses same mask plate respectively described protective seam and described the first insulation course to be carried out composition.
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