CN102799329B - Projected capacitive touch screen panel with single-layer indium tin compound electrode - Google Patents
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- CN102799329B CN102799329B CN201210260421.9A CN201210260421A CN102799329B CN 102799329 B CN102799329 B CN 102799329B CN 201210260421 A CN201210260421 A CN 201210260421A CN 102799329 B CN102799329 B CN 102799329B
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Abstract
The invention discloses a projected capacitive touch screen panel with a single-layer indium tin compound electrode, comprising a first protective layer, an indium tin compound electrode layer and a second protective layer, wherein the indium tin compound electrode layer consists of a plurality of basic units; each basic unit comprises an interdigital type induction region and two driving electrode wiring channels; the interdigital type induction region comprises an induction electrode and a driving electrode which are arranged in an interdigital way. Compared with the prior art, the projected capacitive touch screen panel with the single-layer indium tin compound electrode has the indium tin compound electrode layer, the induction electrode and the driving electrode of the indium tin compound electrode layer are located on the same ITO (Indium Tin Oxide) layer, thus the process complexity is lowered; and as the induction electrode and the driving electrode are not overlapped on the same layer, the bridging process in the traditional touch screen panel is not needed, the manufacturing cost is saved, and the problem of the raising reject ratio of the touch screen panel caused by breakage of a metal connection bridge is avoided. Meanwhile the invention discloses a projected capacitive touch screen.
Description
Technical field
The present invention relates to touch induction device technical field, relate more specifically to a kind of Projected capacitive touch screen panel with single-layer indium tin compound electrode.
Background technology
In recent years, along with the develop rapidly of projected capacitive touch screen technology, the direct control that increasing product starts to utilize touch-control system to come destination object, thus replace the input equipments such as traditional mouse, keyboard, thus save space, make to carry convenient.At present, projected capacitive touch screen technology is widely used in the handheld device such as mobile phone, panel computer.
In existing Projected capacitive touch screen panel, the ITO pattern of electrode layer common on market mainly contains two kinds: rhombus as shown in Figure 1 and dull and stereotyped hollow out figure as shown in Figure 2.Please refer to Fig. 1 and Fig. 1 a, its induction electrode (X-direction electrode) and drive electrode (Y-direction electrode) are formed by basic diamond shaped blocks, and be distributed in two-layer, the ITO pattern of described induction electrode and drive electrode in the vertical direction hardly overlapping (only overlapping in rhombus coupling part), form the electric field structure (as shown in Figure 1a) of Full-open, make finger touch can touch stronger, large-area electric field region, thus produce stronger touch signal.And the dull and stereotyped hollow out graphics panel shown in Fig. 2 is the cross section at two flat poles (induction electrode of X-direction and the drive electrode of Y-direction), in described induction electrode uplifting window hollow out, originally closed between two pole plates electric field line is leaked outside by hollow out figure, thus by finger disturbance, touch signal can be produced.As can be seen from Fig. 1 a and Fig. 2 a, shown in Fig. 1 rhombus panel there is the electric field structure of Full-open, the electric field line between pole plate is exposed to space induction zone completely; Dull and stereotyped hollow out graphics panel shown in Fig. 2 has the electric field structure electric field of bottom crown lap (upper be still in closed state) of fractional open, but due to the downward function of shielding of described drive electrode, makes it have good noise shielding performance.
Because the induction electrode of above-mentioned two kinds of panel X-directions and the drive electrode of Y-direction exist overlapping situation in vertical direction, therefore, in order to realize the insulation of lap, two kinds of methods below general employing solve the overlap problem of ITO pattern: a kind of is the implementation of the double-deck ITO electrode adopted described by Fig. 3, as shown in the figure, the induction electrode of X-direction and the drive electrode of Y-direction realize respectively on two-layer ITO, the transparent insulation material isolation such as glass are used between two-layer ITO, before needing in addition, rear layer glass is as the protective layer of panel, the structure of this double-deck ITO electrode goes for the realization of almost any ITO pattern panel.Another kind is the individual layer ITO electrode implementation of the bridging method adopted described by Fig. 4, as shown in the figure, the induction electrode of X-direction and Y-direction drive electrode are fabricated on same layer glass surface, at overlapping deposition insulating material and the bridge joint metal of ITO pattern, the insulation realizing X and Y-direction ITO electrode be connected.Because the light transmission of bridge joint metal and insulating materials is poor, therefore the method that individual layer ITO puts up a bridge is only applicable to the manufacture of rhombus panel, because the electrode crossing part of rhombus panel is less, insulating materials and bridge joint metal occupy less area on panel, less on the light transmission impact of whole panel.
Although above-mentioned two schemes can realize the insulation of lap, there is following defect:
For the capacitive touch screen panel that the double-deck ITO shown in Fig. 3 realizes, there is following shortcoming:
(1) cost of touch panel is high: the touch panel that double-deck ITO realizes needs triplex glass and two-layer ITO electrode, and compared to the implementation of individual layer ITO, material cost is higher.Because the number of plies of panel is more, processing step during manufacture is loaded down with trivial details, and process is complicated, and manufacturing cost is increased;
(2) touch panel thickness increases, and is unfavorable for realizing the lightening of electronic product.
For the capacitive touch screen panel that the individual layer ITO of the employing bridging method shown in Fig. 4 realizes, there is following shortcoming:
(1) metal electroplated and insulating materials can reduce the transparency of touch-screen, are not suitable for large area and use;
(2) manufacturing process is loaded down with trivial details, and process is complicated, and manufacturing cost increases;
(3) the bad yield that can reduce panel of the fracture of metal connecting bridge, raises the cost.
Therefore, be necessary to provide a kind of Projected capacitive touch screen panel with single-layer indium tin compound electrode of improvement to overcome above-mentioned defect.
Summary of the invention
The object of this invention is to provide a kind of Projected capacitive touch screen panel with single-layer indium tin compound electrode, reducing manufacturing cost, reduce process complexity, avoid the metal connecting bridge in conventional touch screen panel to rupture the problem causing touch panel fraction defective to raise.
Another object of the present invention is to provide a kind of Projected capacitive touch screen, and its touch panel can reduce manufacturing cost, reduce process complexity, avoid the metal connecting bridge in conventional touch screen panel to rupture the problem causing touch panel fraction defective to raise.
For achieving the above object, the invention provides a kind of Projected capacitive touch screen panel with single-layer indium tin compound electrode, comprise the first protective layer, indium tin compound electrode layer and the second protective layer, two surfaces up and down of described indium tin compound electrode layer respectively by described first protective layer and the second protective layer cover, wherein, described indium tin compound electrode layer is made up of multiple elementary cell, the transverse direction of described indium tin compound electrode layer place plane and longitudinally on, between two adjacent described elementary cells, direction is contrary, each described elementary cell comprises an interdigitation induction zone and two drive electrode wiring channels, drive electrode wiring channel described in two lays respectively at the both sides of described interdigitation induction zone, described interdigitation induction zone comprises induction electrode and drive electrode, the arrangement in interdigitated between described induction electrode and drive electrode.
Compared with prior art, because the indium tin compound electrode layer of the Projected capacitive touch screen panel with single-layer indium tin compound electrode is made up of multiple elementary cell, each described elementary cell comprises an interdigitation induction zone and two drive electrode wiring channels, drive electrode wiring channel described in two lays respectively at the both sides of described interdigitation induction zone, described interdigitation induction zone comprises induction electrode and drive electrode, the arrangement in interdigitated between described induction electrode and drive electrode; Namely described induction electrode and drive electrode are positioned at same ITO layer, only need during manufacture to use the ITO engraving method of individual layer just can complete the manufacture of described indium tin compound electrode layer, reduce process complexity, and non-overlapping on the same layer between the induction electrode of the arrangement in interdigitated and drive electrode, without the need to the bridging technique in conventional touch screen panel, thus saving manufacturing cost, the metal connecting bridge that also efficiently avoid in conventional touch screen panel ruptures the problem causing touch panel fraction defective to raise.
Particularly, described induction electrode is E type pectination, and described induction electrode has the first base portion, and described first base portion stretches out and formed in multiple first sawtooth portions of arrange themselves, and multiple described first base portion be that snakelike zigzag is arranged.
Particularly, described drive electrode is F type pectination, described drive electrode has the second base portion, described second base portion stretches out and is formed in multiple second sawtooth portions of arrange themselves, multiple described second base portion in just, reversed F-typed arrangement, and described first base portion and the second base portion are respectively near drive electrode wiring channel described in two, the arrangement in interdigitated between described first sawtooth portion and the second sawtooth portion.
Preferably, each described elementary cell is rectangular.
Particularly, the length of each described elementary cell, width range are 4 ~ 7mm.
Preferably, described first protective layer and the second protective layer are glass.
Correspondingly, invention also provides a kind of Projected capacitive touch screen, comprise touch panel and at fringe region institute's deposit of described touch panel and the metal contact wires of etching, wherein, described touch panel is described above.
Particularly, the material of described metal contact wires is aluminium.
Particularly, the material of described metal contact wires is for using the silver conductive layer that formed of conductive silver paste.
By following description also by reference to the accompanying drawings, the present invention will become more clear, and these accompanying drawings are for explaining embodiments of the invention.
Accompanying drawing explanation
Fig. 1 is that existing Projected capacitive touch screen panel assumes diamond in shape the structure chart of electrode layer of ITO pattern.
Fig. 1 a is for along the distribution map of the electric field after the crosscut of the line of A-A shown in Fig. 1.
The structure chart of Fig. 2 to be existing Projected capacitive touch screen panel be electrode layer of dull and stereotyped hollow out ITO pattern.
Fig. 2 a is the distribution map of the electric field after B-B line crosscut described in Fig. 2.
Fig. 3 is the structure chart of the touch panel in prior art with double-deck ITO electrode.
Fig. 4 is the structure chart of the touch panel in prior art with individual layer ITO electrode.
Fig. 5 is the structure chart that the present invention has Projected capacitive touch screen panel one embodiment of single-layer indium tin compound electrode.
Fig. 6 is the structure chart of the layer of indium tin compound electrode shown in Fig. 5, and wherein said indium tin compound electrode layer is the 4X4 array be made up of 16 elementary cells.
Fig. 7 is the symbol table diagram of the layer of indium tin compound electrode shown in Fig. 6.
Fig. 8 is the structure chart of elementary cell shown in Fig. 6.
Fig. 9 is for along the distribution map of the electric field after the crosscut of the line of C-C shown in Fig. 8.
Figure 10 for finger enter elementary cell shown in Fig. 8 time, finger touch position with induct the graph of a relation of electric capacity.
The layout viewing of the induction electrode of four elementary cells that Figure 11 longitudinally above arranges for the layer of indium tin compound electrode shown in Fig. 6.
The layout viewing of the drive electrode of four elementary cells that Figure 12 longitudinally above arranges for the layer of indium tin compound electrode shown in Fig. 6.
Figure 13 is the structure chart of Projected capacitive touch screen of the present invention.
Detailed description of the invention
With reference now to accompanying drawing, describe embodiments of the invention, element numbers similar in accompanying drawing represents similar element.
Please refer to Fig. 5; describe the preferred embodiment that the present invention has the Projected capacitive touch screen panel 200 of single-layer indium tin compound electrode; it comprises the first protective layer 20, indium tin compound electrode layer 22 and the second protective layer 24; two surfaces up and down of described indium tin compound electrode layer 22 respectively by described first protective layer 20 and the second protective layer 24 cover, the material of described first protective layer 20 and the second protective layer 22 is glass.
Particularly, as shown in Figure 6, in the present embodiment, described indium tin compound electrode layer 22 is the 4X4 arrays be made up of 16 elementary cells, and wherein, each described elementary cell symbol E represents, obtains Fig. 7.In the transverse direction (X-direction) of described indium tin compound electrode layer 22 place plane and longitudinally (Y-direction), between two adjacent described elementary cells, direction is contrary.
Particularly, as shown in Figure 8, each described elementary cell comprises interdigitation induction zone 221 and two drive electrode wiring channels 222, drive electrode wiring channel 222 described in two lays respectively at the both sides of described interdigitation induction zone 221, described interdigitation induction zone 221 comprises induction electrode 221a and drive electrode 221b, the arrangement in interdigitated between described induction electrode 221a and drive electrode 221b.Described drive electrode wiring channel 222 is set, the drive electrode 221b of X-direction is routed in the described drive electrode wiring channel 222 of Y-direction, be parallel with described induction electrode 221a when described like this drive electrode 221b enters described interdigitation induction zone 221, avoid ITO pattern and intersect.Because described induction electrode 221a and drive electrode 221b is in the same plane, both non-overlappings, the space electric field of opening as shown in Figure 9 can be obtained after the crosscut of the line of C-C shown in Fig. 8, therefore electric capacity of inducting can be produced when finger enters described interdigitation induction zone 221, and the finger area that enters described interdigitation induction zone 221 is by the change of electric capacity of inducting described in directly affecting.
Particularly, please refer to Figure 10, the base unit being 6mm for rectangular-shaped, width, elaborate finger and enter impact on described electric capacity of inducting after described interdigitation induction zone 221.As shown in the figure, be approximately the circle representative finger of described elementary cell width with a diameter, progressively move and pass through described interdigitation induction zone 221.(1) when point move in X direction and progress into described interdigitation induction zone 221(move along X1 → X2 → X3 → X4 direction as described in Figure 10 time), what movement caused in X direction the induct relation curve of inducting electric capacity and X-coordinate between of capacitance variations described by the below coordinate system of Figure 10.When finger is displaced to the process of X2 from X1, finger does not enter described interdigitation induction zone 221, and electric capacity of inducting changes hardly; When finger enters X3 again to X4 from X2, electric capacity of inducting experiences one from big to small, then to large process.Due to electric capacity reduction or increase the process of linear change do not followed, the curve linear change that in figure, use one is approximate is similar to this capacitance variations process of inducting, be 0.5 calculating with the poorest filling rate (area of described interdigitation induction zone 221 and the area ratio of whole described elementary cell are called filling rate), it is larger that the X-coordinate error that curve of approximation obtains is no more than 25%(filling rate, and this error is less).(2) when point along Y-direction move and progress into described interdigitation induction zone 221(move along Y1 → Y2 direction as described in Figure 10 time), to induct the relation curve of inducting electric capacity and Y-coordinate between of electric capacity described by the right coordinate system of Figure 10, also be one from big to small, arrive large process again, increase or reduce change approximately linear.Therefore, extend conclusions, from any direction close to described elementary cell, finger can describe with the curve increased again from big to small of a linear change substantially on the impact of electric capacity of inducting, therefore on three-dimensional planar, induct electric capacity and position coordinates present reverse taper relation, namely when finger centre is at described elementary cell center, electric capacity of inducting is minimum, and when finger centre moves to described elementary cell edge, electric capacity of inducting progressively increases.The electric capacity of this reverse taper is similar to rhombus panel characteristics to coordinate relation curve, can calculate according to this relational implementation with the fine granularity finger centre coordinate that TFT unit is base unit.
It should be noted that described indium tin compound electrode layer 22 can be made up of multiple described elementary cell; The shape of described elementary cell is not limited only to rectangle; Length, the width range of each described elementary cell are 4 ~ 7mm, refer to the size of abdomen close to one.
Please refer to Figure 11 and Figure 12 again, described induction electrode 221a is E type pectination, and it has the first base portion 221a1, and described first base portion 221a1 stretches out and formed in multiple first sawtooth portion 221a2 of arrange themselves; Described drive electrode 221b is F type pectination, it has the second base portion 221b1, described second base portion 221b1 stretches out and is formed in multiple second sawtooth portion 221b2 of arrange themselves, and described first base portion 221a1 and the second base portion 221b1 is respectively near drive electrode wiring channel 222 described in two, the arrangement in interdigitated between described first sawtooth portion 221a2 and the second sawtooth portion 221b2.As shown in the figure, after two adjacent described elementary cells mode contrary according to direction on horizontal and vertical is arranged, make described indium tin compound electrode layer 22 have following feature: (1) multiple described first base portion 221a1 be snakelike zigzag arrangement, multiple described second base portion 221b1 in just, reversed F-typed arrangement.
Can be drawn by above description, due to the arrangement in interdigitated between the first sawtooth portion 221a2 of described induction electrode 221a and the second sawtooth portion 221b2 of drive electrode 221b; Namely described induction electrode 221a and drive electrode 221b is positioned at same ITO layer, only need during manufacture to use the ITO engraving method of individual layer just can complete the manufacture of described indium tin compound electrode layer 22, reduce process complexity, and non-overlapping on the same layer between the induction electrode 221a of the arrangement in interdigitated and drive electrode 221b, without the need to the bridging technique in conventional touch screen panel, thus saving manufacturing cost, the metal connecting bridge that it also avoid in conventional touch screen panel ruptures the problem causing touch panel fraction defective to raise.
Correspondingly, as shown in figure 13, present invention also offers a kind of Projected capacitive touch screen 300, comprise touch panel 200 and in fringe region institute's deposit of described touch panel and the metal contact wires (not shown) of etching, in the present embodiment, the material of described metal contact wires is aluminium, or the silver conductive layer for using conductive silver paste to be formed.It should be noted that owing to being described in detail described touch panel 200 above, do not repeat them here.Wherein, flexible PCB (FPC) is used to connect between described induction electrode and drive electrode, use anisotropy electricity glued membrane to be connected between described flexible PCB with described touch panel 200, described touch panel 200 uses described metal contact wires to realize and outside connection.
Particularly, in the present embodiment, described touch panel 300 is made up of 8 (X1 ~ X8) drive electrodes and 16 (Y1 ~ Y16) induction electrodes.On described flexible PCB, all drive electrodes are interconnected and are driven by a drive circuit.
The operation principle of Projected capacitive touch screen 300 of the present invention is as follows: (1) signal measurement, the drive electrode of X1 to X8 is driven one by one, and measure the capacitance of corresponding Y1 ~ Y16 induction electrode, obtain 8X16 dot array data (2) finger to detect and center calculation: according to the capacitance of dot array data zones of different, obtain finger touch information (touch point place signal is less, and non-tactile point signal is stronger).The data matrix coordinate determination coarseness finger coordinate in the stronger region of basis signal, according to coarseness numerical coordinates and signal amplitude, adopts the way of linear interpolation to calculate fine-grained finger centre coordinate, to complete the identification to finger.
More than in conjunction with most preferred embodiment, invention has been described, but the present invention is not limited to the embodiment of above announcement, and should contain various carry out according to essence of the present invention amendment, equivalent combinations.
Claims (7)
1. one kind has the Projected capacitive touch screen panel of single-layer indium tin compound electrode, comprise the first protective layer, indium tin compound electrode layer and the second protective layer, two surfaces up and down of described indium tin compound electrode layer respectively by described first protective layer and the second protective layer cover, it is characterized in that: described indium tin compound electrode layer is made up of multiple elementary cell, the transverse direction of described indium tin compound electrode layer place plane and longitudinally on, between two adjacent described elementary cells, direction is contrary, each described elementary cell comprises an interdigitation induction zone and two drive electrode wiring channels, drive electrode wiring channel described in two lays respectively at the both sides of described interdigitation induction zone, described interdigitation induction zone comprises induction electrode and drive electrode, described induction electrode is E type pectination, described induction electrode has the first base portion, described first base portion stretches out and is formed in multiple first sawtooth portions of arrange themselves, multiple described first base portion is the arrangement of snakelike zigzag, described drive electrode is F type pectination, described drive electrode has the second base portion, described second base portion stretches out and is formed in multiple second sawtooth portions of arrange themselves, multiple described second base portion is just, reversed F-typed arrangement, and described first base portion and the second base portion are respectively near drive electrode wiring channel described in two, the arrangement in interdigitated between described first sawtooth portion and the second sawtooth portion.
2. there is the Projected capacitive touch screen panel of single-layer indium tin compound electrode as claimed in claim 1, it is characterized in that: each described elementary cell is rectangular.
3. there is the Projected capacitive touch screen panel of single-layer indium tin compound electrode as claimed in claim 2, it is characterized in that: length, the width range of each described elementary cell are 4 ~ 7mm.
4. the Projected capacitive touch screen panel with single-layer indium tin compound electrode as described in any one of claim 1-3, is characterized in that: described first protective layer and the second protective layer are glass.
5. a Projected capacitive touch screen, comprises touch panel and at fringe region institute's deposit of described touch panel and the metal contact wires of etching, it is characterized in that: described touch panel is as described in any one of claim 1-4.
6. Projected capacitive touch screen as claimed in claim 5, is characterized in that: the material of described metal contact wires is aluminium.
7. Projected capacitive touch screen as claimed in claim 6, is characterized in that: the silver conductive layer that the material of described metal contact wires is formed for using conductive silver paste.
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| CN201210260421.9A CN102799329B (en) | 2012-07-25 | 2012-07-25 | Projected capacitive touch screen panel with single-layer indium tin compound electrode |
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| CN201210260421.9A CN102799329B (en) | 2012-07-25 | 2012-07-25 | Projected capacitive touch screen panel with single-layer indium tin compound electrode |
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| CN102799329B true CN102799329B (en) | 2015-04-29 |
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| CN103116427B (en) * | 2012-12-10 | 2016-05-18 | 文山嘉鑫科技有限公司 | Bridging lead-in wire sensor and the moulding process thereof of individual layer multi-point touch screen |
| CN103105991B (en) * | 2013-01-25 | 2016-04-06 | 深圳市汇顶科技股份有限公司 | Individual layer capacitive touch screen and touch control terminal |
| CN104007863A (en) | 2013-02-26 | 2014-08-27 | 北京京东方光电科技有限公司 | Single-layer touch screen and manufacturing method thereof and touch screen displayer |
| CN103336635B (en) * | 2013-05-13 | 2016-08-10 | 京东方科技集团股份有限公司 | A kind of capacitance type in-cell touch panel and display device |
| US9639214B2 (en) * | 2013-07-22 | 2017-05-02 | Synaptics Incorporated | Utilizing chip-on-glass technology to jumper routing traces |
| CN104657021A (en) * | 2015-02-28 | 2015-05-27 | 深圳市华星光电技术有限公司 | Embedded touch structure and liquid crystal display panel with embedded touch structure |
| CN107430468B (en) * | 2015-03-10 | 2020-10-16 | 瑟克公司 | Method for reducing electrode paths on a single layer touch sensor |
| CN110134272A (en) * | 2019-04-23 | 2019-08-16 | 精电(河源)显示技术有限公司 | A kind of inductive layer and its touch device with force snesor |
| CN110134273A (en) * | 2019-04-23 | 2019-08-16 | 精电(河源)显示技术有限公司 | A kind of inductive layer and its touch device with force snesor |
| EP4078259B1 (en) * | 2019-12-19 | 2024-04-17 | ams Sensors Singapore Pte. Ltd. | Optical component |
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| GB2428306B (en) * | 2005-07-08 | 2007-09-26 | Harald Philipp | Two-dimensional capacitive position sensor |
| KR100979910B1 (en) * | 2008-01-29 | 2010-09-06 | (주)멜파스 | Touchscreen panel having partitioned transparent electrode structure |
| CN102331875A (en) * | 2011-06-24 | 2012-01-25 | 苏州瀚瑞微电子有限公司 | Single-layered ITO (indium tin oxide) wiring structure |
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