CN101847053B - Screen body of touch screen - Google Patents
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- CN101847053B CN101847053B CN2009101064368A CN200910106436A CN101847053B CN 101847053 B CN101847053 B CN 101847053B CN 2009101064368 A CN2009101064368 A CN 2009101064368A CN 200910106436 A CN200910106436 A CN 200910106436A CN 101847053 B CN101847053 B CN 101847053B
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Abstract
The invention provides a screen body of a touch screen, which comprises a first conducting layer, a second conducting layer and a third conducting layer, wherein the first conducting layer is at least provided with a first pair of edges, which comprises a first edge and a second edge, and the second edge is roughly parallel to the first edge, so that when a power source is loaded onto the first edge and the second edge, a voltage drop can be caused on the first conducting layer between the first edge and the second edge; the second conducting layer is separated from the first conducting layer by a first partitioning layer and provided with a second pair of edges, which comprises a third edge and a fourth edge, and the third edge is roughly parallel to the fourth edge, so that when the power source is loaded onto the third edge and the fourth edge, a voltage drop can be caused on the second conducting layer between the third edge and the fourth edge; and the third conducting layer is separated from the second conducting layer by a second partitioning layer and provided with a plurality of conducting areas which are insulated from each other.
Description
Technical Field
The invention relates to a touch screen technology, in particular to a touch screen body.
Background
Touch screens have entered various fields as a human-computer interaction interface, and are widely used in portable electronic devices and public query devices in particular. The user can click a certain functional button on the screen or input contents such as characters and graphs by handwriting by pressing the touch screen with a finger or a touch pen.
Touch screens can be divided into four basic types in principle: resistive touch screens, capacitive touch screens, infrared touch screens, and surface acoustic wave touch screens. Among them, the resistive touch screen is the touch screen with the lowest cost and the most widely used. The touch screen is composed of a touch screen body and a touch screen controller thereof.
The resistive touch panel is classified into a four-wire resistive touch panel, a five-wire resistive touch panel, and the like according to the number of lead lines. Fig. 1 is a schematic cross-sectional structure diagram of a five-wire resistive touch screen body, which mainly includes: a lower conductive layer, an isolation layer, and an upper conductive layer. Wherein, the isolation layer is composed of particles with very small volume and elasticity, and the isolation layer is used for isolating the upper conductive layer and the lower conductive layer when a user does not press because the distance between the upper conductive layer and the lower conductive layer is usually only in a micron order.
Fig. 2a and 2b are schematic views of the opposite surfaces of the lower conductive layer and the upper conductive layer, respectively, of the screen shown in fig. 1. As shown in fig. 2a, on the lower conductive layer, the surface opposite to the upper conductive layer is covered with a resistive layer, and four electrodes 201 are distributed on the edge of the resistive layer; as shown in fig. 2b, an electrode 201' is distributed on the upper conductive layer at the edge of the surface opposite to the lower conductive layer. As shown in fig. 1, two insulating layers are further disposed between the electrodes on the lower conductive layer and the electrodes on the upper conductive layer, and the two insulating layers are connected together through an adhesive layer.
Fig. 3 is a schematic structural diagram of a touch screen controller, where the touch screen controller includes a switch module, an interrupt module, a control module, an analog-to-digital conversion module, and a power supply module. Wherein,
the switch module comprises two groups of switch tubes respectively positioned in the X direction and two groups of switch tubes positioned in the Y direction, and each switch tube is provided with two connecting ends and a control end. One connecting end of the switch tube corresponding to the electrode positioned on one side in the X direction of the figure is connected with the power supply module, the other connecting end of the switch tube is connected with one electrode on the lower conducting layer, one connecting end of the switch tube corresponding to the electrode positioned on the other side is grounded, and the other connecting end of the switch tube is connected with one electrode on the lower conducting layer. One connecting end of the switch tube corresponding to the electrode on one side of the Y side of the figure is connected with the power supply module, the other connecting end of the switch tube is connected with one electrode on the lower conducting layer, the other connecting end of the switch tube corresponding to the other side of the Y side of the figure is connected with the ground, and the other connecting end of the switch tube is connected with one electrode on the lower conducting layer. And the control ends of all the switch tubes are connected with the control module.
The interrupt module is grounded and connected with an electrode 201 'on the upper conductive layer of the screen body and any one electrode 201 on the lower conductive layer, and a power supply is further arranged in the interrupt module, wherein the electrode 201' on the upper conductive layer is connected with an internal power supply, and any one electrode 201 on the lower conductive layer is connected with a ground wire of the interrupt module.
The control module is connected to the control end of each switching tube in the switching module, and for simplicity of illustration, the connection relationship between the control module and the control end of each switching tube is not shown in fig. 3. The control module is also connected with a microprocessor in an application system where the touch screen controller is located, when the microprocessor in the application system where the touch screen controller is located receives an interrupt signal sent by the interrupt module and sends an instruction to the control module, the control module firstly controls all switch tubes in the X direction to be closed, voltage is applied in the X direction, and at the moment, because the upper conducting layer and the lower conducting layer are contacted after being pressed, the actual voltage value of the pressing position in the X direction is output to the analog-to-digital conversion module by the electrode of the upper conducting layer; and then the control module controls all the switching tubes in the X direction to be switched off, controls all the switching tubes in the Y direction to be switched on, applies voltage in the Y direction, and outputs the actual voltage value of the pressing position in the Y direction to the analog-to-digital conversion module by the electrode of the upper conducting layer. Of course, the control sequence may be Y direction first and then X direction.
The analog-to-digital conversion module is connected with an electrode 201' on a conducting layer on the screen body and is also connected with a microprocessor in an application system where the touch screen controller is located. The analog-to-digital conversion module converts the voltage value in the X direction and the voltage value in the Y direction output by the electrode 201' of the upper conductive layer into digital signals and outputs the digital signals to a microprocessor in an application system where the touch screen controller is located, and the microprocessor obtains the coordinates of the current pressing position according to the digital signals and a certain corresponding relation.
According to the structure of the five-wire resistive touch screen body, if a user presses two positions at the same time on the upper conductive layer, i.e. two touch points are formed, according to the operation process of the touch screen controller described above, when a voltage is applied to the lower conductive layer in the X direction or the Y direction, since the upper conductive layer has only one electrode 201 'outputting a voltage value, the resistance between two contact positions of the upper conductive layer and the lower conductive layer is equivalent to being short-circuited, the actual voltage value output from the electrode 201' on the upper conductive layer is approximately equivalent to the average of the actual voltage values of the two pressed positions, and the finally obtained position information is approximately the middle position of the two actual pressed positions. The accurate positions of the two touch points cannot be recognized simultaneously, so that the gesture recognition of the matching of a plurality of fingers cannot be performed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: touch screen among the prior art only includes resistance-type touch induction system, can't discern the accurate position of two touch points simultaneously to a plurality of fingers matched with gesture recognition can't carry out.
In order to solve the problems in the prior art, the technical scheme of the invention is realized as follows:
a touch screen body, comprising:
a first conductive layer having at least a first pair of edges, the first pair of edges including a first edge and a second edge, wherein the second edge is substantially parallel to the first edge, and wherein when a power source is applied to the first edge and the second edge, a voltage drop is generated across the first conductive layer between the first edge and the second edge;
and a second conductive layer separated from the first conductive layer by a first spacer layer, the second conductive layer having a second pair of edges, the second pair of edges including a third edge and a fourth edge, the third edge and the fourth edge being disposed substantially parallel; when power is applied to the third edge and the fourth edge, a voltage drop is generated on the second conducting layer between the third edge and the fourth edge;
when the second conductive layer is in contact with the first conductive layer, the second conductive layer can generate an output signal according to a voltage drop generated on the first conductive layer between the first edge and the second edge, and the magnitude of the output signal at least depends on the positions of the contact points in the conductive area relative to the first edge and the second edge;
when the second conductive layer is in contact with the first conductive layer, the first conductive layer may generate an output signal according to a voltage drop generated on the second conductive layer between the third edge and the fourth edge, a magnitude of the output signal depending on at least a position of the contact point in the conductive area with respect to the third edge and the fourth edge; and a third conductive layer separated from said second conductive layer by a second spacer layer, said third conductive layer comprising a plurality of conductive regions insulated from one another; when a predetermined amount of charge is stored between the plurality of mutually insulated conductive regions and the ground, the plurality of mutually insulated conductive regions generate an output signal according to the touch or approach of the human body.
Therefore, in the invention, the third conducting layer which is divided into a plurality of mutually insulated conducting areas is added in the resistive touch screen body, when a preset amount of charges are stored between the plurality of mutually insulated conducting areas and the ground, the mutually insulated conducting areas generate an output signal according to the touch or approach of a human body or a conductor, and therefore, the touch screen can further realize the identification of a plurality of touch points on the basis of keeping the single-point touch function.
Drawings
FIG. 1 is a schematic cross-sectional view of a five-wire resistive touch screen body of the prior art;
FIG. 2a is a schematic view of a surface of the panel of FIG. 1 opposite the top conductive layer on the bottom conductive layer;
FIG. 2b is a schematic surface view of the panel of FIG. 1 with the upper conductive layer on the surface opposite the lower conductive layer;
FIG. 3 is a schematic diagram of a prior art touch screen controller;
FIG. 4 is a schematic diagram of a region of a touch screen body including a first third conductive layer according to the present invention;
FIG. 5 is a schematic diagram of an area including a second third conductive layer of the touch screen body according to the present invention;
FIG. 6 is a schematic diagram of an area including a third conductive layer of the touch screen body according to the present invention;
FIG. 7 is a side view of a touch screen body of the present invention;
fig. 8 is a schematic structural diagram of a touch screen controller in an embodiment of the present invention.
Detailed Description
To further clarify the objects and advantages of the present invention, a more particular description of the invention will be rendered by reference to the appended drawings.
First, a specific embodiment of the touch screen body provided by the present invention is mentioned, in which the touch screen body includes a first conductive layer, a second conductive layer, and a third conductive layer, and the first conductive layer, the second conductive layer, and the third conductive layer are all rectangular in shape.
Fig. 4 is a schematic diagram of an area included in a first third conductive layer of a touch screen body according to an embodiment of the present invention, where the third conductive layer includes 20 areas that are all right-angled triangles, have the same size, and are insulated from each other, and each area has an electrode for outputting a signal, that is, an output terminal, and the electrodes are distributed on an edge of the third conductive layer.
Of course, fig. 4 is only a specific example, and fig. 5 and fig. 6 are schematic views of the areas included in the second and third conductive layers of the touch screen body according to the embodiment of the present invention, respectively. Fig. 5 shows that the third conductive layer comprises 6 regions which are rectangular in shape, identical in size and insulated from each other. Fig. 6 shows that the third conductive layer includes 17 mutually insulated regions, and unlike fig. 4 and 5, the regions shown in fig. 6 are not exactly the same in shape and size.
Therefore, the mutually insulated conductive areas included in the third conductive layer in the touch screen body provided by the invention can be designed into any shape according to actual needs.
FIG. 7 is a side view of a touch screen body of the present invention; the touch screen body provided by the embodiment of the invention includes a first conductive layer 500, and a transparent conductive material such as ITO or LEP is attached to the upper surface of the first conductive layer 500. The first spacer layer 601 is disposed on the first conductive layer 500. in some examples, the first spacer layer 601 is formed of a two-dimensional array of particles formed of an elastic insulating material (transparent resin film, typically composed of an acrylic resin, a dispersant, and a photosensitive compound). The array of particles separates the first conductive layer from the second conductive layer to avoid accidental contact. In some examples, the spatial array of microdots is applied to first conductive layer 500 via a process that precisely controls the size, height, and density of the dots.
The first conductive electrode layer 501 is disposed at the edge of the first conductive layer 500 and electrically connected to the transparent conductive material attached to the first conductive layer 500. In some embodiments, the first conductive electrode layer 501 is disposed at the opposite edge of the first conductive layer 500. When the positive and negative poles of the supply voltage are connected to 2 electrodes on 2 opposite borders on the first conductive layer 500, there will be a voltage drop across the first conductive layer 500 and a current will flow.
As shown in fig. 7, the touch screen body according to the embodiment of the invention further includes a second conductive layer 400 separated from the first conductive layer 500 by a first spacing layer 601, and a transparent conductive material such as ITO or LEP is attached to a lower surface of the second conductive layer 400. The second conductive electrode layer 401 is disposed at opposite edges of the second conductive layer 400 and is electrically connected to the transparent conductive material. To reflect the X-direction and Y-direction touches, the second conductive electrode layer is perpendicular to the first conductive electrode layer 501.
When there is a voltage drop in the first conductive layer 500, the first spacer layer is deformed by pressing the second conductive layer 400, so that the first conductive layer contacts the second conductive layer, and the second conductive layer outputs a touch signal through the second conductive electrode layer 401.
When there is a voltage drop on the second conductive layer 400, the first spacer layer is deformed by pressing the second conductive layer 400, so that the first conductive layer contacts the second conductive layer, and the first conductive layer outputs a touch signal through the first conductive electrode layer 501.
Two insulators 701 are attached to respective ends of the first conductive electrode layer 501 and the second conductive electrode layer 401, respectively, so that the two electrode layers 501 and 401 are not connected to each other and potential failure of the touch panel during application is avoided. In some examples, two insulators 701 are bonded together by a double-sided adhesive layer 702.
As shown in fig. 7, the touch screen body according to the embodiment of the present invention further includes a third conductive layer 300 separated from the second conductive layer 400 by a second spacer layer 602; the second spacer layer 602 includes a layered elastic insulating material (transparent resin film, generally composed of an acrylic resin, a dispersant and a photosensitive compound) disposed on the second conductive layer at a predetermined height; a transparent conductive material such as ITO or LEP is attached to a lower surface of the third conductive layer 300, dotted lines on the third conductive layer 300 represent regions where the transparent conductive material is divided to be insulated from each other, and the third conductive electrode layer 301, i.e., output terminals, are distributed at edges of the third conductive layer 300. In some examples, the electrode layer is divided into a plurality of segments isolated from each other, i.e., output terminals and each segment is connected to a conductive region in the third conductive layer 300, which generates an output signal according to a touch or approach of a human body when a predetermined amount of electric charges are stored between a conductive region of the third conductive layer and the ground, and the output signal is transmitted to a microcontroller connected to the touch screen body through a segment of the third conductive electrode layer 301.
The specific working principle of the embodiment of the invention is as follows:
when a user needs to perform multi-point touch, the first conducting electrode layer and the second conducting electrode layer are grounded, a voltage is applied to each mutually insulated conducting area of the third conducting layer, a preset amount of charges are stored between each mutually insulated conducting area and the ground, when the user touches each mutually insulated conducting area with a finger, because a human can be regarded as an artificial grounding object (a zero potential body), when a human body is close to or contacts with the mutually insulated conducting areas, the distance between each mutually insulated conducting area and the ground is shortened by the human body, the capacitance between each mutually insulated conducting area and the ground is changed, the change of the charges stored between each mutually insulated conducting area and the ground is caused, and therefore an output signal is generated.
When a user needs to perform single-point touch control, grounding the third conductive electrode layer on the third conductor; the second conductive electrode layer of the second conductive layer is electrically connected with the microprocessor in the touch screen controller; and respectively connected to 2 electrode layers of 2 opposite boundaries on the first conductive layer 500 when the positive and negative poles of the power voltage are applied. Or electrically connecting the first conductive electrode layer of the first conductive layer with a microprocessor in the touch screen controller; and respectively when the positive and negative poles of the power supply voltage are connected to 2 electrode layers of 2 opposite boundaries on the second conductive layer 400.
At the moment, the third conducting layer is pressed with a certain pressure, and the third conducting layer and the second separating layer deform to transmit the pressure to the second conducting layer; when the second conductive layer is in contact with the first conductive layer at a certain point, the second conductive layer may generate an output signal based on a voltage drop generated across the first conductive layer between the first edge and the second edge when the second conductive layer is in contact with the first conductive layer, the magnitude of the output signal being dependent on at least the position of the contact point in the conductive area relative to the first edge and the second edge; and the output signal is transmitted to the microcontroller connected with the touch screen body through the second conductive electrode layer.
When the second conductive layer is in contact with the first conductive layer, the first conductive layer may generate an output signal according to a voltage drop generated on the second conductive layer between the third edge and the fourth edge, a magnitude of the output signal depending on at least a position of the contact point in the conductive area with respect to the third edge and the fourth edge; the output signal is transmitted to the microcontroller connected with the touch screen body through the first conductive electrode layer.
Therefore, the touch screen body provided by the invention is additionally provided with the third conducting layer which is divided into a plurality of mutually insulated conducting areas on the basis of the original four-wire resistance touch screen structure, and the plurality of mutually insulated conducting areas are uniformly distributed with one electrode. Based on the structure, a user can change the working mode of the touch screen according to actual needs, so that the touch screen can work in a capacitance sensing mode to perform multi-point recognition, gesture judgment is convenient to realize, and the touch screen can work in a resistance sensing mode to facilitate character input.
Next, based on the structure of the resistive touch screen body, a specific embodiment of the resistive touch screen controller of the present invention is given.
Fig. 8 is a schematic structural diagram of a resistive touch screen controller according to an embodiment of the present invention, where the touch screen controller includes: the device comprises a switch module, a control module, a power supply module and a microcontroller; the power module is used for providing working voltage for the touch screen. The first conducting electrode layers Xp and Xn, the second conducting electrode layers Yp and Yn and the third conducting electrode layer Det of the touch screen body are all connected with the switch module; in order to detect the specific position of the touch point, the first conductive electrode layer and the second conductive electrode layer are perpendicular to each other and used for respectively detecting the position of the touch point in the X direction and the position of the touch point in the Y direction; the switch module controls the electrical connection state of each electrode layer according to a switch control signal sent by the control module, and transmits a touch signal output by the electrode layer to the microcontroller; the switch control signal is generated by the control module according to the control of the microcontroller. The working process of the touch screen controller for controlling the touch screen body is further described as follows:
when a user needs to work the touch screen in a capacitance state, the user sends an instruction to the microcontroller, the control module generates a switch control signal according to the control of the microcontroller, the control switch module controls the first conductive electrode layers Xp and Xn, the second conductive electrode layers Yp and Yn to be grounded, and the third conductive electrode layer Det to be connected with a power supply voltage, so that a predetermined amount of charges are stored between the mutually insulated conductive regions and the ground. In some embodiments, the electrical connection state of each electrode layer can also be directly adjusted by controlling the switch module.
When a user needs to work the touch screen in a resistance state, the user sends an instruction to the microcontroller, the control module generates a switch control signal according to the control of the microcontroller, the third conducting electrode layer Det is grounded, when a touch signal in the X direction is detected, the second conducting electrode layers Yp and Yn are connected with the microcontroller, the first conducting electrode layers Xp and Xn are connected with the power module, and the first conducting electrode layers are connected with the power module. The concrete mode is as follows: connecting the electrode layer Xp and the electrode layer Xn in the X direction with the anode and the cathode of the power module respectively, and enabling a conducting layer between the electrode layer Xp and the electrode layer Xn to generate voltage drop; thereby generating a touch position signal in the X-direction, and the second conductive electrode layers Yp, Yn transmit the touch position signal in the X-direction to the microcontroller for processing. When the touch signal in the Y direction is detected, the first conductive electrode layers Xp and Xn are connected with the microcontroller, the second conductive electrode layers Yp and Yn are connected with the power module, and the second conductive electrode layers are connected with the power module. The concrete mode is as follows: connecting the electrode layer Yp in the Y direction with the positive electrode of the power module and connecting the electrode layer Yn with the negative electrode of the power module, and enabling a conducting layer between the electrode layer Yp and the electrode layer Yn to generate voltage drop, wherein at the moment, pressing force of a user on the touch screen is exerted on the second conducting layer through the third conducting layer and the second separating layer, so that the second conducting layer is in contact with the first conducting layer; thereby generating a touch position signal in the Y direction, and the first conductive electrode layers Xp, Xn transmit the touch position signal in the Y direction to the microcontroller for processing.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A touch screen body, comprising:
a first conductive layer having at least a first pair of edges, the first pair of edges including a first edge and a second edge, wherein the second edge is substantially parallel to the first edge, and wherein when a power source is applied to the first edge and the second edge, a voltage drop is generated across the first conductive layer between the first edge and the second edge;
and a second conductive layer separated from the first conductive layer by a first spacer layer, the second conductive layer having a second pair of edges, the second pair of edges including a third edge and a fourth edge, the third edge and the fourth edge being disposed substantially parallel; when a power source is applied to the third and fourth edges, a voltage drop is generated across the second conductive layer between the third and fourth edges, the first spacer layer comprising a particulate resilient insulating material disposed on the first conductive layer in a predetermined shape, height and density, the particulate resilient insulating material being distributed in a two-dimensional array;
when the second conductive layer is in contact with the first conductive layer, the second conductive layer can generate an output signal according to a voltage drop generated on the first conductive layer between the first edge and the second edge, and the magnitude of the output signal at least depends on the positions of the contact points in the conductive area relative to the first edge and the second edge;
when the second conductive layer is in contact with the first conductive layer, the first conductive layer may generate an output signal according to a voltage drop generated on the second conductive layer between the third edge and the fourth edge, a magnitude of the output signal depending on at least a position of the contact point in the conductive area with respect to the third edge and the fourth edge;
and a third conductive layer separated from said second conductive layer by a second spacer layer, said third conductive layer comprising a plurality of conductive regions insulated from one another; when a predetermined amount of charge is stored between the plurality of mutually insulated conductive regions and the ground, the plurality of mutually insulated conductive regions generate an output signal according to the touch or approach of the human body.
2. The touch screen body of claim 1, wherein the plurality of mutually isolated conductive regions are of a same shape.
3. The touch screen body of claim 1, wherein the plurality of mutually isolated conductive regions are at least two in shape.
4. The touch screen body of claim 1, wherein at least one of the plurality of mutually isolated conductive regions is polygonal.
5. The touch screen body of claim 4, wherein the polygon is a regular polygon.
6. The touch screen body of claim 4, wherein the polygon is an irregular polygon.
7. The touch screen panel of claim 4, wherein the polygon is any one of a triangle, a rectangle, a square, and a hexagon.
8. The touch screen body of claim 1, wherein the material of the first, second, and third conductive layers is a transparent conductive material.
9. The touch screen body of claim 8, wherein the transparent conductive material is indium tin oxide.
10. The touch screen body of claim 8, wherein the transparent conductive material is a light emitting polymer.
11. The touch screen body of claim 1, wherein the second spacer layer comprises a layered elastic insulating material disposed on the second conductive layer at a predetermined height.
12. The touch screen body of claim 1, further comprising a plurality of output terminals, wherein each output terminal is connected to one of the plurality of mutually insulated conductive regions.
13. The touch screen body of claim 1, wherein the third edge is disposed substantially perpendicular to the first edge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101064368A CN101847053B (en) | 2009-03-27 | 2009-03-27 | Screen body of touch screen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101064368A CN101847053B (en) | 2009-03-27 | 2009-03-27 | Screen body of touch screen |
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| CN101847053A CN101847053A (en) | 2010-09-29 |
| CN101847053B true CN101847053B (en) | 2012-06-06 |
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| CN102520834A (en) * | 2011-12-01 | 2012-06-27 | 杭州安费诺飞凤通信部品有限公司 | Method for manufacturing resistance-type touch screen and resistance-type touch screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339481A (en) * | 2008-08-14 | 2009-01-07 | 成都吉锐触摸技术股份有限公司 | Electric resistance array touch screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339481A (en) * | 2008-08-14 | 2009-01-07 | 成都吉锐触摸技术股份有限公司 | Electric resistance array touch screen |
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| JP特开2004-234268A 2004.08.19 |
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