CN106502479B - Touch display device - Google Patents
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- CN106502479B CN106502479B CN201510560327.9A CN201510560327A CN106502479B CN 106502479 B CN106502479 B CN 106502479B CN 201510560327 A CN201510560327 A CN 201510560327A CN 106502479 B CN106502479 B CN 106502479B
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Abstract
The invention relates to a touch display device, which comprises a capacitive touch screen and a display module, wherein the capacitive touch screen is arranged in a lamination mode, the capacitive touch screen comprises a touch driving electrode and a touch sensing electrode, the touch driving electrode and the touch sensing electrode are used for sensing touch signals applied to the capacitive touch screen, the touch display device also comprises a pressure sensing electrode, the pressure sensing electrode and the touch driving electrode or the touch sensing electrode are positioned in the same lamination mode, the touch display device also comprises a plate body, the surface of the plate body is conductive and opposite to the pressure sensing electrode, and the pressure sensing electrode and the plate body form a capacitive sensor and are used for sensing pressure signals applied to the capacitive touch screen. The pressure sensing electrode for sensing the pressure signal can be manufactured simultaneously with the touch electrode for sensing the touch signal, and has the advantages of low production cost, simple process and the like.
Description
Technical Field
The present invention relates to the field of touch display, and in particular, to a touch display device with a pressure sensing function.
Background
The touch screen has the advantages of easy operability, flexibility and the like, and becomes a main man-machine interaction means of personal mobile communication equipment and comprehensive information terminals (such as mobile phones, tablet computers, super notebook computers and the like). Compared with resistive touch screens and touch screens in other modes, capacitive touch screens are gradually widely used by intelligent terminals with the advantages of low cost, simple structure, durability and the like. However, the conventional capacitive touch screen only senses the touch position and operation of the plane where the screen body is located, and it is difficult to sense the touch parameters caused by the pressure change applied to the surface of the screen body.
In order to be able to sense the pressure change at the surface of the screen, the industry integrates pressure sensors within the touch screen. However, the existing methods are to pile the pressure sensor in the touch screen, which makes it difficult to make contribution to simplification of the whole structure of the touch screen, so that the production cost of the touch screen with the pressure sensor is high.
Disclosure of Invention
Accordingly, it is necessary to provide a touch display device having a simple structure and low production cost, in order to solve the problems of the touch panel having a pressure sensor, such as a complicated structure and high production cost.
The utility model provides a touch display device, is including being capacitive touch screen and the display module group that the stromatolite set up, capacitive touch screen includes touch drive electrode and touch-sensitive electrode, touch drive electrode and touch-sensitive electrode are used for responding to the touch signal who applys on capacitive touch screen, touch display device still includes the pressure-sensitive electrode, the pressure-sensitive electrode is located same stromatolite with touch drive electrode or touch-sensitive electrode, touch display device still includes a surface electrically conductive and with the plate body of pressure-sensitive electrode opposition, the pressure-sensitive electrode with the plate body forms capacitive sensor and is used for responding to the pressure signal who applys on capacitive touch screen.
According to the touch display device, the pressure signal of touch operation is obtained in the mode of monitoring the capacitance, meanwhile, one end electrode of the capacitance sensor used for sensing the pressure signal is located on the same lamination of the touch electrode used for sensing the touch signal such as touch position information, sensing of the pressure signal can be achieved without additionally arranging the pressure sensor, and the pressure sensing electrode used for sensing the pressure signal can be manufactured simultaneously with the touch electrode used for sensing the touch signal, so that the touch display device has the advantages of being low in production cost, simple in process and the like.
In one embodiment, the display module includes a polarizer, a filter, and a liquid crystal layer arranged in a stack; the pressure sensing electrode, the touch driving electrode and the touch sensing electrode are integrally arranged in the liquid crystal layer, or the pressure sensing electrode, the touch driving electrode and the touch sensing electrode are arranged between the polaroid and the optical filter.
In one embodiment, the capacitive touch screen further includes a substrate carrying the touch driving electrode and the touch sensing electrode, where the pressure sensing electrode and the touch driving electrode or the touch sensing electrode share the substrate and are located on the same surface of the substrate.
In one embodiment, the capacitive touch screen further includes a protective cover plate as a substrate carrying the touch driving electrodes and/or the touch sensing electrodes.
In one embodiment, the capacitive touch screen further includes a first substrate carrying a touch driving electrode and a second substrate carrying a touch sensing electrode, where the pressure sensing electrode is disposed on the first substrate or the second substrate.
In one embodiment, a grounding wire is arranged between the pressure sensing electrode and the touch driving electrode or the touch sensing electrode.
In one embodiment, the pressure sensing electrodes are distributed in the center, corners, edges, or in an array of capacitive touch screens throughout the capacitive touch screen.
In one embodiment, the area of the pressure sensing electrodes distributed at the edge of the capacitive touch screen is larger than the area of the pressure sensing electrodes distributed at the center of the capacitive touch screen.
In one embodiment, the plate body is a metal plate body, or the plate body is formed by compounding an insulating base material and a metal base material, or the plate body comprises an insulating base material and a conductive layer arranged on the surface of the insulating base material.
In one embodiment, the plate is a middle frame supporting the display module.
In one embodiment, the surface of the plate body facing one side of the capacitive touch screen is conductive.
In one embodiment, the conductive layer is a grounded conductive layer disposed on an upper surface or a lower surface of the display module.
In one embodiment, the conductive layer is a metal guard plate under the display module.
In one embodiment, the touch sensor further comprises a processor, wherein the processor is used for controlling the working time sequence of the pressure sensing electrode and the working time sequences of the touch driving electrode and the touch sensing electrode to be staggered, so that the sensing of the pressure signal and the sensing of the touch signal are not interfered with each other.
In one embodiment, the touch display device further comprises a processor that causes the pressure sensing electrode to provide a first state in which the pressure sensing electrode is configured to sense a touch signal and a second state in which the pressure sensing electrode is configured to sense a pressure signal.
Drawings
Fig. 1 is a schematic diagram of a portion of a capacitive touch screen in a touch display device according to an embodiment of the invention.
Fig. 2 is a schematic diagram of another part of a capacitive touch screen in a touch display device according to an embodiment of the invention.
Fig. 3 is a schematic view of a portion of a capacitive touch screen in a touch display device according to another embodiment of the invention.
Fig. 4 is a schematic view of a portion of a capacitive touch screen in a touch display device according to another embodiment of the invention.
Fig. 5 is a schematic view of a portion of a capacitive touch screen in a touch display device according to another embodiment of the invention.
Fig. 6 is a schematic cross-sectional structure of a touch display device according to an embodiment of the invention.
Fig. 7 is a schematic cross-sectional structure of a touch display device according to another embodiment of the invention.
Fig. 8 is a schematic cross-sectional structure of a touch display device according to another embodiment of the invention.
Detailed Description
The touch display device provided by the invention can be used as a display terminal with a touch interaction mode of a mobile phone, a tablet personal computer and the like.
The touch display device comprises a capacitive touch screen and a display module which are arranged in a laminated mode, and a plate body for bearing the capacitive touch screen and the display module.
In one embodiment, the capacitive touch screen includes a protective cover plate, a touch driving electrode, a touch sensing electrode, and a substrate. The substrate is used for bearing the touch driving electrode and the touch sensing electrode. The protective cover plate is used for protecting structures such as the base plate, the touch driving electrode, the touch sensing electrode and the like.
The touch driving electrodes and the touch sensing electrodes may be distributed on the same substrate, such as GF structures, GF2 structures, etc., as known in the art, or may be distributed on two different substrates, such as GFF structures, as known in the art. In other embodiments, the touch driving electrode and the touch sensing electrode may be formed on the inner side of the protective cover plate, so that the protective cover plate also has the function of a capacitive sensor. If the touch driving electrode and the touch sensing electrode are formed on the protective cover plate, the substrate for carrying the touch driving electrode and the touch sensing electrode is replaced by the protective cover plate, and the structure is referred to as an OGS structure in the industry. In other embodiments, one of the two touch electrodes may be formed on a surface of the substrate attached to the protective cover, such as a G1F structure.
In some other embodiments, the display module includes a polarizer, a filter, and a liquid crystal layer arranged in a stack. The display module also includes other structures such as thin film transistors for driving the liquid crystal. Wherein the touch driving electrode and the touch sensing electrode are integrally disposed in the liquid crystal layer (the structure of the capacitive touch screen is referred to as in-cell structure in the industry), or the touch driving electrode and the touch sensing electrode are disposed between the polarizer and the optical filter (the structure of the capacitive touch screen is referred to as on-cell structure in the industry).
The touch driving electrode and the touch sensing electrode are used for sensing touch signals applied to the capacitive touch screen. The touch signals include touch input signals parallel to the two-dimensional direction of the capacitive touch screen, such as contact, sliding, dragging, etc., and even touch input signals perpendicular to the capacitive touch screen (i.e., hover touch signal) or to the sides of the capacitive touch screen edge (e.g., curved sides of a curved screen).
The plate body is a conductive plate body. The plate body is used as a carrier of the capacitive touch screen and the display module, and if necessary, the plate body can be insulated with elements in the capacitive touch screen and the display module. When the touch display device is a mobile phone, the plate body can be a middle frame of the mobile phone. The plate body is arranged in the mobile phone shell, one side of the plate body is used for bearing components such as a capacitive touch screen, a display module and a main board of the touch display device, and the other side of the plate body is used for placing components such as a battery. When the touch display device is another type of device, it may be a similar plate.
The plate body can be made of metal materials and is grounded with the touch display device in the same way. Or the plate body is formed by compounding an insulating base material and a metal base material, and the same grounding treatment is adopted with the touch display device. Or the plate body comprises an insulating base material and a conducting layer arranged on one side surface of the insulating base material, and the same grounding treatment is adopted with the touch display device.
The touch display device further comprises a pressure sensing electrode, wherein the pressure sensing electrode and the touch driving electrode or the touch sensing electrode are positioned on the same lamination, and the pressure sensing electrode is opposite to the conductive plate body to form a capacitance sensor and is used for sensing a pressure signal applied to the capacitance touch screen.
The pressure sensing electrode and the touch driving electrode or the touch sensing electrode are located on the same layer stack, and it can be understood that when the touch driving electrode and the touch sensing electrode are not located on the same substrate, the pressure sensing electrode can be located on the same substrate as the touch driving electrode or the same substrate as the touch sensing electrode; when the touch driving electrode and the touch sensing electrode are positioned on the same substrate or are stacked, the pressure sensing electrode, the touch driving electrode and the touch sensing electrode are positioned on the same substrate or are stacked. Specifically, when the touch driving electrode and the touch sensing electrode are distributed on the same substrate, the pressure sensing electrode is also distributed on the same substrate. When the touch driving electrode and the touch sensing electrode are distributed on different substrates, the pressure sensing electrode may be selectively distributed on one of the substrates. In some embodiments, the protective cover plate of the capacitive touch screen may serve as one of the substrates. When the touch driving electrode and the touch sensing electrode are integrally disposed in the liquid crystal layer, the pressure sensing electrode is also disposed in the liquid crystal layer. When the touch driving electrode and the touch sensing electrode are disposed between the polarizer and the optical filter, the pressure sensing electrode is also disposed between the polarizer and the optical filter.
In the touch display device described above, the pressure-sensitive electrode and the grounded plate form a capacitive sensor. When pressure is applied to the capacitive touch screen, the distance d between the pressure sensing electrode and the plate body becomes weak, and according to the calculation formula c=epsilon S/4 pi kd of the capacitance, the capacitance value of the capacitive sensor formed between the pressure sensing electrode and the plate body becomes large. The different touch pressures on the capacitive touch screen cause corresponding strain at each position of the capacitive touch screen, so that corresponding d value change is generated. Accordingly, a correlation database of capacitance change information of the capacitive sensor formed by the pressure sensing electrode and the plate body in the capacitive touch screen and stress information of the capacitive touch screen can be established. In practical application, the stress information of the capacitive touch screen can be obtained according to the capacitance change information of each capacitive sensor formed by the pressure sensing electrode and the plate body after the capacitive touch screen is stressed.
The touch display device in the different embodiments will be further described with reference to the accompanying drawings. The touch display screen in the touch display device comprises a protective cover plate and two base plates, and a touch driving electrode and a touch sensing electrode in the touch display screen are respectively and correspondingly arranged on one of the base plates. In one embodiment, the protective cover plate is made of glass, and the substrate is made of a thin film, that is, the structure of the capacitive touch screen is referred to as GFF structure in industry.
As shown in fig. 1, a substrate 10 in a capacitive touch screen, and a touch driving electrode 11 and a pressure sensing electrode 30 formed on the substrate 10. As shown in fig. 2, there is another substrate 20 in the capacitive touch screen and a touch sensing electrode 21 formed on the substrate 20. Wherein the substrate 10 is remote from the protective cover compared to the substrate 20, i.e. the substrate 20 is located between the protective cover and the substrate 10. The touch sensing electrode 21 in fig. 2 is rectangular, and it is understood that the shape is not limited to this, and the touch sensing electrode 21 is led to the interface end 201 of the substrate 20 through the lead 210. The touch sensing electrode 21 and the touch driving electrode 11 are used together as constituent elements in a touch sensing unit of a capacitive touch screen for sensing a touch signal applied to the capacitive touch screen. The touch signals include touch input signals parallel to the two-dimensional direction of the capacitive touch screen, such as contact, sliding, dragging, etc., and even touch input signals perpendicular to the capacitive touch screen (i.e., hover touch signal) or to the sides of the capacitive touch screen edge (e.g., curved sides of a curved screen).
The substrate 10 is further provided with a lead 110 for guiding the touch driving electrode 11 to the interface end 101 of the substrate 10. Similarly, the substrate 10 is also provided with a lead 300 for guiding the pressure sensing electrode 30 to the interface end 101 of the substrate 10. In this embodiment, the pressure sensing electrodes 30 are distributed on the substrate 10 in the form of an array of electrode blocks. The area of the pressure sensing electrode 30 distributed at the edge of the capacitive touch screen (i.e. the edge of the substrate 10) is slightly larger than the area of the pressure sensing electrode 30 distributed at the center of the capacitive touch screen (i.e. the center of the substrate 10), in general, the center position of the capacitive touch screen is easier to deform, and thus the position and the deformation of the capacitive touch screen can be considered by setting the area of the pressure sensing electrode 30, and the pressure sensing sensitivity of each position can be balanced. The pressure sensing electrode 30 is surrounded by the touch driving electrode 11, leaving only a gap for the lead 300 to pass through.
In various embodiments, the pressure sensing electrode 30 may also be located outside the touch driving electrode 11 without being surrounded by the touch driving electrode 11. To reduce or avoid the influence of the touch driving electrode 11 (or the touch sensing electrode 21) for sensing a touch signal on the pressure sensing electrode 30 for sensing a pressure signal, the two electrodes may be separated by a ground wire (not shown). Meanwhile, the periphery of each electrode and lead wire is surrounded by a grounded wire 40 on the substrate 10 to reduce or avoid the influence of electromagnetic fields in or outside the touch display device on the induction of touch signals and pressure signals.
Fig. 3 is a schematic structural diagram of a substrate 10, a touch driving electrode 11, and a pressure sensing electrode 30 of a capacitive touch screen according to another embodiment. Wherein the pressure sensing electrodes 30 are distributed in a plurality of electrode blocks in the center of the substrate 10 of the capacitive touch screen.
Fig. 4 is a schematic structural diagram of a substrate 10, a touch driving electrode 11, and a pressure sensing electrode 30 of a capacitive touch screen according to another embodiment. Wherein the pressure-sensing electrode 30 is surrounded by only a portion of the touch driving electrode 11, i.e., another portion of the touch driving electrode 11 is separated from the pressure-sensing electrode 30 independently of each other, without forming a surrounding and surrounded relationship.
Fig. 5 is a schematic structural diagram of a substrate 10, a touch driving electrode 11, and a pressure sensing electrode 30 of a capacitive touch screen according to another embodiment. Wherein the pressure sensing electrodes 30 and the touch driving electrodes 11 are respectively and independently separated and are respectively distributed at intervals in a strip shape. Specifically, a plurality of block-shaped pressure sensing electrodes 30 are arranged between the two touch driving electrodes 11 at intervals, and the pressure sensing electrodes 30 arranged at intervals are arranged linearly. To reduce or avoid the influence of the touch driving electrode 11 (or the touch sensing electrode 21) for sensing a touch signal on the pressure sensing electrode 30 for sensing a pressure signal, the two electrodes may be separated by a conductive line (not shown) connected to ground.
In the above-described embodiment, the shape of the pressure-sensitive electrode 30 is shown as square in the drawings, but it is to be understood that the shape is not limited to square, but may be other shapes such as triangle, rectangle, prism, trapezoid, etc.; the touch driving electrode 11 is illustrated as a rectangle in the drawing, but it should be understood that the shape is not limited to a rectangle, and may be other shapes.
In the foregoing embodiment, the pressure sensing electrode 30 may also be located on another substrate 20, i.e. the pressure sensing electrode 30 and the touch sensing electrode 21 are located on the same layer. In this structure, the positional relationship of the pressure-sensing electrode 30 and the touch-sensing electrode 21 is similar to that of the pressure-sensing electrode 30 and the touch-driving electrode 11 in the foregoing embodiment.
For other structures of capacitive touch screens, such as GF, OGS, G1F, GF, in-cell, on-cell, etc., the pressure sensing electrode 30 is in the same stack as the touch driving electrode 11 or the touch sensing electrode 21. In the structures GF, OGS, on-cell, in-cell, etc., the touch driving electrodes and the touch sensing electrodes are located in the same stack, and the pressure sensing electrodes 30 are distributed beside the touch driving electrodes 11 and/or the touch sensing electrodes 21 and may be surrounded by the touch driving electrodes 11 and/or the touch sensing electrodes 21. In what is known in the art as a G1F, GF, the distribution of the pressure sensing electrodes 30 is similar to that shown in the embodiment of the GFF structure described above.
When the touch display device with the pressure sensing function is in operation, in order to avoid the mutual influence of the detection of the touch signal and the pressure signal, the time sequence control mode can be adopted to enable the sensing of the touch signal and the sensing of the pressure signal to operate in a time-sharing mode, so that mutual interference is not generated when the corresponding function is realized. The time sequence control mode can be performed by a processor connected with the capacitive touch screen, and also can be performed by additional elements such as a processor and a memory. In the above touch display device, a processor for sensing a touch signal and for sensing a pressure signal may be separately provided. The same processor may also be used for monitoring the touch signal and the pressure signal for cost reduction.
In order to avoid the influence of the thin film transistor and the liquid crystal pixel electrode in the display module on the pressure signal induction during operation, the touch display device can be further provided with other elements such as a processor and a memory, and the operation of the thin film transistor of the display module and the induction time of the pressure signal can be further enabled to operate in different time periods through the processor and the memory, namely, the thin film transistor of the display module is in a non-operating state during the induction of the pressure signal.
Further, in the touch display device, the pressure sensing electrode for sensing the pressure signal may be a common electrode with the touch driving electrode or the touch sensing electrode for sensing the touch signal, that is, the same electrode may be used for sensing the pressure signal or the touch signal. In this case, the touch display device further includes additional processor and memory, such that the common electrodes provide at least a first state and a second state; wherein in the first state the common electrode is configured for detection of touch signals in a two-dimensional direction parallel to the capacitive touch screen and for sensing of touch signals such as detection of a space input (i.e. hover touch) in a direction perpendicular to the touch screen or detection of touch input to a side of an edge of the device, and in the second state the common electrode is configured to form a number of capacitive sensors with the plate for detection of pressure signals. Taking fig. 1 as an example, the pressure sensing electrode 30 on the substrate 10 may be used as a common electrode, that is, the pressure sensing electrode 30 may load a touch driving signal like the touch driving electrode 11, in addition to sensing pressure. For example, in the T1 period, a touch driving electrode 11 and the pressure sensing electrode 30 enclosed by the touch driving electrode are simultaneously loaded with a touch driving signal, for example, a driving voltage; in the T2 period, the driving electrode 11 is not applied with a driving voltage, and is in a floating state, and the corresponding pressure sensing electrode 30 turns on the pressure sensing detection circuit for detecting pressure. The operation state of the common electrode on the substrate 10 may be controlled by an additional processor. Further, the time-sharing working state of the common electrode can be realized through the existing touch control circuit.
Fig. 6 is a schematic cross-sectional structure of a touch display device according to an embodiment of the invention, where a glue or OCA for bonding is not labeled in the schematic cross-sectional structure. In the schematic structural diagram of this embodiment, the touch driving electrode 11 and the touch sensing electrode 21 of the capacitive touch screen are on different substrates 10, 20, and the pressure sensing electrode 30 for forming the capacitive sensor for detecting pressure is on the same substrate 10 as the touch driving electrode 11 of the capacitive touch screen. The capacitive touch screen in the touch display device further comprises a protective cover plate 100 positioned above the touch sensing electrode 21, a display module 50 positioned below the capacitive touch screen, and a plate body supporting the capacitive touch screen and the display module 50. A gap 500 exists between the board body and the display module 50. In this embodiment, the plate body is a middle frame 51 supporting the capacitive touch screen and the display module 50, and at least one surface of the middle frame 51 is conductive and adopts the same grounding process as the touch display device. The middle frame 51 may be made of metal, or the middle frame 51 is a composite board body of an insulating substrate and a metal substrate, and the metal material is located at one side of the insulating substrate facing the capacitive touch screen, or the middle frame 51 includes an insulating substrate and a conductive layer disposed at one side of the insulating substrate.
Referring to fig. 7, the plate body may be a conventional metal protection plate 52 for protecting the display module 50 and for electromagnetic shielding, and is located directly under the display module 50.
In addition, when the touch display device has both the middle frame 51 supporting the display module 50 and the metal guard plate 52 protecting the display module and the middle frame 51 is used as the pressure sensing plate, this arrangement may interfere with the normal operation of the pressure sensing. Therefore, the metal guard plate 52 of the display module 50 and the middle frame 51 adopt different grounding treatments. Further, when the capacitive sensor for detecting pressure is in operation, the metal guard plate 52 of the display module 50 is suspended.
Fig. 8 is a schematic cross-sectional structure of a touch display device according to another embodiment of the invention, where a glue or OCA for bonding is not labeled in the schematic cross-sectional structure. In the schematic structural diagram of this embodiment, the touch driving electrode 11 and the touch sensing electrode 21 of the capacitive touch screen are on different substrates 10, 20, and the pressure sensing electrode 30 for forming the capacitive sensor for detecting pressure is on the same substrate 10 as the touch driving electrode 11 of the capacitive touch screen. The capacitive touch screen in the touch display device further comprises a protective cover plate 100 positioned above the touch sensing electrode 21, a display module 50 positioned below the capacitive touch screen, and a plate body supporting the capacitive touch screen and the display module 50. A gap 500 exists between the board body and the display module 50. In this embodiment, the upper surface of the display module 50 has a conductive layer 53, and the conductive layer 53 is prepared on the surface of the display module 50 by vapor deposition, sputtering, printing, or by a conductive film material adhered over the display module 50. The conductive layer 53 on the surface of the display module 50 serves as a plate body, and forms a capacitive sensor with a pressure sensing electrode for detecting pressure in the capacitive touch screen, so as to realize a pressure detection function of the touch display device. In addition, the conductive layer 53 on the surface of the display module 50 may also be located on the lower surface of the display module 50.
According to the invention, the pressure signal of touch operation is obtained by monitoring the capacitance, and meanwhile, one end electrode of the capacitance sensor for sensing the pressure signal is positioned on the same lamination of the touch electrode for sensing touch signals such as touch position information, so that the sensing of the pressure signal can be realized without additionally arranging the pressure sensor, and the pressure sensing electrode for sensing the pressure signal can be manufactured at the same time of the touch electrode for sensing the touch signal, and has the advantages of low production cost, simple process and the like.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (12)
1. The touch display device comprises a capacitive touch screen and a display module, wherein the capacitive touch screen is arranged in a lamination mode and comprises a touch driving electrode and a touch sensing electrode, and the touch driving electrode and the touch sensing electrode are used for sensing touch signals applied to the capacitive touch screen;
the capacitive touch screen also comprises a substrate bearing a touch driving electrode and a touch sensing electrode, wherein the pressure sensing electrode and the touch driving electrode or the touch sensing electrode share the substrate and are positioned on the same surface of the substrate;
the capacitive touch screen further comprises a protective cover plate, wherein the protective cover plate is used as a substrate for bearing the touch driving electrode and/or the touch sensing electrode;
and a grounding wire is arranged between the pressure sensing electrode and the touch driving electrode or the touch sensing electrode.
2. The touch display device of claim 1, wherein the display module comprises a polarizer, a filter, and a liquid crystal layer arranged in a stack; the pressure sensing electrode, the touch driving electrode and the touch sensing electrode are integrally arranged in the liquid crystal layer, or the pressure sensing electrode, the touch driving electrode and the touch sensing electrode are arranged between the polaroid and the optical filter.
3. The touch display device of claim 1, wherein the capacitive touch screen further comprises a first substrate carrying touch drive electrodes and a second substrate carrying touch sense electrodes, the pressure sense electrodes being disposed on the first substrate or the second substrate.
4. The touch display device of claim 1, wherein the pressure-sensitive electrodes are distributed in a center, corner, edge, or array of capacitive touch screens throughout the capacitive touch screen.
5. The touch display device of claim 4, wherein the area of the pressure sensing electrodes distributed at the edge of the capacitive touch screen is greater than the area of the pressure sensing electrodes distributed at the center of the capacitive touch screen.
6. The touch display device according to claim 1, wherein the plate body is a metal plate body, or the plate body is formed by compounding an insulating base material and a metal base material, or the plate body comprises an insulating base material and a conductive layer arranged on the surface of the insulating base material.
7. The touch display device of claim 6, wherein the plate is a center supporting the display module.
8. The touch display device of claim 7, wherein a surface of the plate body facing a side of the capacitive touch screen is conductive.
9. The touch display device of claim 6, wherein the conductive layer is a grounded conductive layer disposed on an upper surface or a lower surface of the display module.
10. The touch display device of claim 6, wherein the conductive layer is a metal guard plate under the display module.
11. The touch display device of any one of claims 1-10, further comprising a processor configured to control the timing of operation of the pressure sensing electrode and the timing of operation of the touch driving electrode and the touch sensing electrode to be staggered such that sensing of the pressure signal and sensing of the touch signal do not interfere with each other.
12. The touch display device of any one of claims 1-10, further comprising a processor that causes the pressure sensing electrode to provide a first state in which the pressure sensing electrode is configured to sense a touch signal and a second state in which the pressure sensing electrode is configured to sense a pressure signal.
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| CN201510560327.9A CN106502479B (en) | 2015-09-06 | 2015-09-06 | Touch display device |
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Citations (7)
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| KR101452302B1 (en) * | 2013-07-29 | 2014-10-22 | 주식회사 하이딥 | Touch sensor panel |
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