CN111596796B - Three-dimensional touch module, driving method thereof and display device - Google Patents
Three-dimensional touch module, driving method thereof and display device Download PDFInfo
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- CN111596796B CN111596796B CN202010406096.7A CN202010406096A CN111596796B CN 111596796 B CN111596796 B CN 111596796B CN 202010406096 A CN202010406096 A CN 202010406096A CN 111596796 B CN111596796 B CN 111596796B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
Abstract
The application discloses a three-dimensional touch module, a driving method thereof and a display device, which are used for simplifying the structural complexity and the preparation difficulty of the three-dimensional touch module and realizing the integration of pressure touch functions. The three-dimensional touch module that this application embodiment provided includes: the touch control driving electrodes are arranged in an array, the touch control sensing electrodes are arranged in an array, the pressure sensing electrodes are arranged in a one-to-one correspondence with the touch control driving electrodes and are opposite to each other, and the dielectric layer is arranged between the touch control driving electrodes and the pressure sensing electrodes; the touch driving electrode and the touch sensing electrode are not overlapped and insulated from each other, and the pressure sensing electrode and the touch sensing electrode are not overlapped and insulated from each other; the touch driving electrode is electrically connected with the first touch lead in the first direction, the touch sensing electrode is electrically connected with the second touch lead in the second direction, the pressure sensing electrode is electrically connected with the third touch lead in the first direction, and the first direction and the second direction are crossed.
Description
Technical Field
The application relates to the technical field of display, in particular to a three-dimensional touch module, a driving method thereof and a display device.
Background
Currently, touch screens are widely applied to various electronic devices such as smart phones, tablet computers, televisions and the like. Conventional touch modes focus on achieving finger position recognition in a two-dimensional plane. With the development of touch screen technology, the touch pressure detection function can increase the touch mode to three dimensions, and richer human-computer interaction scenes can be realized. The prior art is to realize the pressure sensing function by using a capacitance structure designed in the whole machine, and the structure is independent of a touch structure in a screen, so that the touch screen is complex in structure and high in production cost.
To sum up, the scheme of realizing three-dimensional touch control in the prior art needs to additionally arrange a pressure sensing structure, so that the touch screen is complex in structure, higher in production cost and lighter and thinner in product.
Disclosure of Invention
The embodiment of the application provides a three-dimensional touch module, a driving method thereof and a display device, which are used for simplifying the structural complexity and the preparation difficulty of the three-dimensional touch module and realizing the integration of pressure touch functions.
The embodiment of the application provides a three-dimensional touch module, three-dimensional touch module includes: the touch control driving device comprises a plurality of touch control driving electrodes which are arranged in an array, a plurality of touch control sensing electrodes which are arranged in an array, pressure sensing electrodes which are in one-to-one correspondence with the touch control driving electrodes and are oppositely arranged, and a dielectric layer positioned between the touch control driving electrodes and the pressure sensing electrodes;
the touch driving electrode and the touch sensing electrode are not overlapped and insulated from each other, and the pressure sensing electrode and the touch sensing electrode are not overlapped and insulated from each other;
the touch control driving electrode is electrically connected with the first touch control lead wire in a first direction, the touch control induction is electrically connected with the second touch control lead wire in a second direction, the pressure induction electrode is electrically connected with the third touch control lead wire in the first direction, and the first direction and the second direction are intersected.
According to the three-dimensional touch module provided by the embodiment of the application, on the basis of the touch driving electrode, the touch sensing electrode and the dielectric layer which are at the touch position, the touch pressure detection can be realized only by arranging the pressure sensing electrode opposite to the touch electrode on one side of the dielectric layer, which is away from the touch driving electrode, one electrode multiplexing the touch driving electrode for realizing the touch pressure detection, and the pressure-touch function integration is realized, so that a complex touch pressure detection structure independent of the touch position detection is not required, and the structural complexity and the preparation difficulty of the three-dimensional touch module are simplified.
Optionally, orthographic projections of the touch driving electrode and the pressure sensing electrode coincide.
Therefore, the touch driving electrode, the pressure sensing electrode and the dielectric layer form a sandwich structure, and the accuracy of touch pressure detection is improved.
Optionally, the touch sensing electrode and the pressure sensing electrode are located on the same layer;
the three-dimensional touch module further comprises: the first insulating layer is positioned between the touch sensing electrode and the dielectric layer;
the second touch lead includes: a bridge between the first insulating layer and the dielectric layer; the bridging portion is electrically connected with the touch sensing electrode through a via hole penetrating through the first insulating layer.
Optionally, the touch sensing electrode and the touch driving electrode are located on the same layer;
the three-dimensional touch module further comprises: the second insulating layer is positioned between the touch control driving electrode and the dielectric layer;
the second touch lead includes: a bridge between the second insulating layer and the dielectric layer; the bridging portion is electrically connected with the touch sensing electrode through a via hole penetrating through the second insulating layer.
Optionally, the material of the dielectric layer includes: polyvinylidene fluoride; the polyvinylidene fluoride has piezoelectric performance through a low-temperature crystallization process and an electric field polarization process.
Optionally, the pressure sensing electrode is located at a side of the touch driving electrode facing away from the touch operation.
The embodiment of the application provides a driving method of the three-dimensional touch module, which comprises the following steps:
a touch position detection stage, namely providing a first driving signal for the touch driving electrode, providing a touch position detection signal for the touch sensing electrode, receiving a touch sensing signal fed back by the touch sensing electrode, and determining a touch position according to the touch sensing signal;
and in the touch pressure detection stage, a second driving signal is provided for the touch driving electrode, a touch pressure detection signal is provided for the pressure sensing electrode, a pressure sensing signal fed back by the pressure sensing electrode is received, and the touch pressure is determined according to the pressure sensing signal.
According to the touch module driving method, when touch operation occurs, the touch driving electrodes are driven in a time-sharing mode, in the touch position detection stage, the touch position is determined by the touch driving electrodes and the touch sensing electrodes, and in the touch pressure detection stage, the touch pressure is determined by the touch driving electrodes and the pressure sensing electrodes, so that three-dimensional touch position detection can be achieved.
The embodiment of the application provides a display device, the display device includes: the three-dimensional touch module comprises an array substrate and the three-dimensional touch module provided by the embodiment of the application and positioned on the array substrate.
The display device provided by the embodiment of the application comprises the three-dimensional touch module provided by the embodiment of the application, and the three-dimensional touch module comprises a structure for realizing integration of pressure and touch functions, so that a complicated touch pressure detection structure independent of touch position detection is not required to be arranged, the structural complexity and the preparation difficulty of the display device are simplified, and the thickness of the display device can be simplified.
Optionally, the array substrate includes: a substrate, a thin film transistor pixel circuit on the substrate, an electroluminescent device on the thin film transistor pixel circuit, and a packaging layer on the electroluminescent device for sealing the electroluminescent device;
the display device further includes: a color film and a black matrix positioned on the encapsulation layer; the black matrix is provided with an opening area in array arrangement, and the color film is positioned in the opening area;
the three-dimensional touch module is located between the color film and the packaging layer.
Optionally, the orthographic projection of the black matrix covers the orthographic projection of the touch driving electrode, the orthographic projection of the touch sensing electrode, and the orthographic projection of the pressure sensing electrode.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a three-dimensional touch module provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of another three-dimensional touch module according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another three-dimensional touch module according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another three-dimensional touch module according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another three-dimensional touch module according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of another three-dimensional touch module according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of another three-dimensional touch module according to an embodiment of the present disclosure;
FIG. 8 is a graph showing the transmittance test results of PVDF in the visible light range provided in the examples of the present application;
fig. 9 is a flowchart of a driving method of a three-dimensional touch module according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides a three-dimensional touch module, as shown in fig. 1 and 2, the three-dimensional touch module includes: the touch control driving device comprises a plurality of touch control driving electrodes 1 which are arranged in an array, a plurality of touch control sensing electrodes 2 which are arranged in an array, pressure sensing electrodes 3 which are in one-to-one correspondence with the touch control driving electrodes 1 and are oppositely arranged, and a dielectric layer 4 which is positioned between the touch control driving electrodes 1 and the pressure sensing electrodes 3;
the touch driving electrode 1 and the touch sensing electrode 2 are not overlapped and insulated from each other, and the pressure sensing electrode 3 and the touch sensing electrode 2 are not overlapped and insulated from each other;
the touch driving electrode 1 is electrically connected in a first direction Y through a first touch lead 7; the touch sensing device 2 is electrically connected in a second direction X through a second touch lead 8; the pressure sensing electrode is electrically connected in the first direction through a third touch lead; the first direction Y and the second direction X intersect.
Fig. 2 is a top view of a touch driving electrode and a touch sensing electrode in a three-dimensional touch module according to an embodiment of the present application. In fig. 2, the first direction is taken as the Y direction, and the second direction is taken as the X direction, and in practical implementation, the first direction and the second direction may be selected according to actual needs.
It should be noted that, the three-dimensional touch module provided by the embodiment of the application adopts the dielectric layer as the insulating layer between the touch driving electrode and the touch sensing electrode, and the pressure sensing electrode is further arranged on one side, away from the touch driving electrode, of the dielectric layer, because the dielectric layer has piezoelectric property, the mutual conversion between mechanical energy and electric energy can be realized, when a certain force is applied to the dielectric layer, certain electric charge can be generated on the surface of the dielectric layer, the quantity of the electric charge generated by the dielectric layer is in direct proportion to the force, so that the three-dimensional touch module provided by the embodiment of the application can determine the touch pressure by detecting the capacitance change between the touch driving electrode and the pressure sensing electrode, and the three-dimensional touch module can also determine the touch position by detecting the capacitance change between the touch driving electrode and the touch sensing electrode, thereby realizing three-dimensional touch position detection.
According to the three-dimensional touch module provided by the embodiment of the application, on the basis of the touch driving electrode, the touch sensing electrode and the dielectric layer which are at the touch position, the touch pressure detection can be realized only by arranging the pressure sensing electrode opposite to the touch electrode on one side of the dielectric layer, which is away from the touch driving electrode, so that one electrode multiplexing the touch driving electrode for realizing the touch pressure detection can realize the integration of pressure and touch functions, a complex touch pressure detection structure independent of the touch position detection is not required, and the structural complexity and the preparation difficulty of the three-dimensional touch module are simplified.
In fig. 2, the projected shapes of the touch sensing electrode and the touch driving electrode are exemplified as rectangular blocks. Of course, in the implementation, as shown in fig. 3, the projected shapes of the touch sensing electrode and the touch driving electrode may be bar shapes, and in fig. 3, the width of the touch lead is consistent with the width of the electrode. Alternatively, when the projection shapes of the touch sensing electrode and the touch driving electrode are rectangular blocks, the arrangement of the touch sensing electrode and the touch driving electrode may be as shown in fig. 4.
Optionally, as shown in fig. 1, the orthographic projections of the touch driving electrode and the pressure sensing electrode coincide. The touch driving electrode, the pressure sensing electrode and the dielectric layer form a sandwich structure, so that the accuracy of touch pressure detection is improved.
In specific implementation, the orthographic projection of the third touch lead coincides with the orthographic projection of the first touch lead.
Optionally, as shown in fig. 1 and fig. 5, the touch sensing electrode 2 and the pressure sensing electrode 3 are located on the same layer;
the three-dimensional touch module further comprises: a first insulating layer 5 located between the touch sensing electrode 2 and the dielectric layer 4;
the second touch lead 8 includes: a bridge 9 between the first insulating layer 5 and the dielectric layer 4;
the bridging portion 9 is electrically connected to the touch sensing electrode 2 through a via penetrating through the first insulating layer 5.
Alternatively, as shown in fig. 6 and 7, the touch sensing electrode 2 and the touch driving electrode 1 are located at the same layer;
the three-dimensional touch module further comprises: a second insulating layer 11 located between the touch driving electrode 1 and the dielectric layer 4;
the second touch lead 8 includes: a bridge 9 between the second insulating layer 11 and the dielectric layer 4; the bridging portion 9 is electrically connected to the touch sensing electrode 2 through a via penetrating through the second insulating layer 11.
Fig. 1 and 6 may be, for example, sectional views taken along AA 'in fig. 2, and fig. 5 and 7 may be, for example, sectional views taken along BB' in fig. 2.
In practical implementation, as shown in fig. 5 and 7, the orthographic projection of the third touch lead 10 coincides with the orthographic projection of the first touch lead 7.
It should be noted that, no matter which layer the touch sensing electrode is located, in order to reduce the capacitance generated between the touch sensing electrode and the pressure sensing electrode as much as possible, the larger the distance between the touch sensing electrode and the pressure sensing electrode in the same touch structure is, the better.
In a specific implementation, the touch driving electrode is further electrically connected to a driving chip (IC), and the touch driving electrode may be electrically connected to two ICs, where one IC is configured to provide a signal to the touch driving electrode during a touch position detection phase and the other IC is configured to provide a signal to the touch driving electrode during a touch pressure detection phase. Of course, the touch driving electrode may be electrically connected to an IC, and the IC may provide a signal to the touch driving electrode in the touch position stage and provide a signal to the touch driving electrode in the touch pressure detection stage.
Optionally, the material of the dielectric layer includes: polyvinylidene fluoride (PVDF); PVDF has piezoelectric properties through a low temperature crystallization process and an electric field polarization process.
PVDF has a dielectric constant of 9-12, and when a force is applied, the charge generated by PVDF is proportional to the magnitude of the force. When the material of the dielectric layer is PVDF, the transmittance test result of PVDF film forming in the visible light range under the low temperature process is shown in FIG. 8, the average transmittance of PVDF in the visible light range is 95.87%, the transmittance is higher, and the transmittance and brightness of the display product are not affected when the three-dimensional touch module provided by the embodiment of the application is applied to the display product.
Moreover, it should be noted that, for the scheme that the touch pressure detection structure is independent of the touch position detection structure in the prior art, the pressure classification of the touch pressure detection is realized at most by 3 stages, and the touch pressure detection sensitivity is lower. The three-dimensional touch module provided by the embodiment of the application can be used as a dielectric layer of a touch structure and can be used as a piezoelectric layer for touch pressure detection, so that the function of touch pressure detection is completely integrated in the touch structure for realizing touch position detection, the pressure grading of the touch pressure detection can reach 10 levels, the recognition flexibility is greatly improved, richer man-machine interaction can be realized, and meanwhile, the thickness and the process difficulty of the touch module can be reduced.
Optionally, the pressure sensing electrode is located at a side of the touch driving electrode facing away from the touch operation.
In a specific implementation, the three-dimensional touch module may be formed on the substrate 6, for example. The three-dimensional touch module further comprises: and the packaging insulating layer is positioned at one side of the touch control driving electrode, which is away from the dielectric layer.
Based on the same inventive concept, the embodiment of the present application further provides a driving method of a three-dimensional touch module, as shown in fig. 9, where the method includes:
s101, in a touch position detection stage, a first driving signal is provided for the touch driving electrode, a touch position detection signal is provided for the touch sensing electrode, a touch sensing signal fed back by the touch sensing electrode is received, and a touch position is determined according to the touch sensing signal;
and S102, in a touch pressure detection stage, a second driving signal is provided for the touch driving electrode, a touch pressure detection signal is provided for the pressure sensing electrode, a pressure sensing signal fed back by the pressure sensing electrode is received, and the touch pressure is determined according to the pressure sensing signal.
According to the touch module driving method, when touch operation occurs, the touch driving electrodes are driven in a time-sharing mode, in the touch position detection stage, the touch position is determined by the touch driving electrodes and the touch sensing electrodes, and in the touch pressure detection stage, the touch pressure is determined by the touch driving electrodes and the pressure sensing electrodes, so that three-dimensional touch position detection can be achieved.
In fig. 9, touch position detection is performed first, and then touch pressure detection is performed as an example, and in a specific implementation, touch pressure detection may be performed first, and then touch position detection may be performed.
It should be noted that, in the touch position detection stage, no signal is provided to the pressure sensing electrode, the pressure sensing electrode does not work, the touch position detection is not affected, in the touch pressure detection stage, no signal is provided to the touch sensing electrode, the touch sensing electrode does not work, and the touch pressure detection is not affected.
In the specific implementation, in the touch testing stage, the capacitance change between the touch driving electrode and the touch sensing electrode is determined according to the touch sensing signal, so that the touch position is determined. And in the pressure testing stage, the capacitance change between the touch driving electrode and the pressure sensing electrode is determined according to the pressure sensing signal, so that the touch pressure is determined.
Based on the same inventive concept, the embodiments of the present application further provide a display device, as shown in fig. 10, including: the array substrate 12, and the three-dimensional touch module 13 provided in the embodiment of the application and located on the array substrate 12.
The display device provided by the embodiment of the application comprises the three-dimensional touch module provided by the embodiment of the application, and the three-dimensional touch module comprises a structure for realizing integration of pressure and touch functions, so that a complicated touch pressure detection structure independent of touch position detection is not required to be arranged, the structural complexity and the preparation difficulty of the display device are simplified, and the thickness of the display device can be simplified.
Alternatively, as shown in fig. 10, the array substrate 12 includes: a substrate 14, a thin film transistor 15 on the substrate, an electroluminescent device 16 on the thin film transistor 15, and an encapsulation layer 17 on the electroluminescent device 16 sealing the electroluminescent device 16;
the display device further includes: a color film 18 and a black matrix 19 on the encapsulation layer 17; the black matrix 19 has an opening area arranged in an array, and the color film 18 is located in the opening area;
the three-dimensional touch module 13 is located between the color film 18 and the encapsulation layer 17.
That is, the display device provided in the embodiments of the present application may be, for example, an electroluminescent display device, and the electroluminescent device may be, for example, an organic light emitting diode device (OLED).
As shown in fig. 10, an insulating layer 20 is further included between the thin film transistor 15 and the substrate 14, and the insulating layer 20 may specifically include: a Polyimide (PI) layer, a first buffer layer and a second buffer layer formed in this order. The thin film transistor 15 includes: an active layer 21, a Gate Insulator (GI) 22 over the active layer 21, a Gate electrode 23 over the Gate Insulator 22, an interlayer Insulator (Interlayer Dielectric, ILD) 24 over the Gate electrode 23, and a source electrode 25 and a drain electrode 26 over the interlayer Insulator 24, the source electrode 25 and the drain electrode 26 being in contact with the active layer 21 through vias penetrating the interlayer Insulator 24 and the Gate Insulator 22. The electroluminescent device 16 includes: an anode 27, a light-emitting functional layer 28, and a cathode 29 are stacked in this order. A Planarization (PLN) layer 30 is further included between the anode 27 and the drain electrode 26, and the anode 27 is electrically connected to the drain electrode 26 through a via penetrating the Planarization layer 30. A pixel defining layer 31 is also arranged between the electroluminescent devices. The three-dimensional touch module 13 further includes an encapsulation insulating layer 33. Also included on top of the color film 18 and black matrix 19 is an Optical Clear Adhesive (OCA) 34 and cover glass 35.
In fig. 10, a thin film transistor is taken as an example of a top gate structure of the thin film transistor, and in the implementation, the thin film transistor may also be a bottom gate structure. In fig. 10, the touch sensing electrode and the pressure sensing electrode are illustrated as being located on the same layer, and in the implementation, the touch sensing electrode and the touch driving electrode may be located on the same layer.
In specific implementation, the display device is divided into a plurality of sub-pixels, and the opening areas of the black matrix and the electroluminescent devices are in one-to-one correspondence with the sub-pixels. The subpixels may include, for example, red subpixels, blue subpixels, and green subpixels. The electroluminescent device corresponding to the red sub-pixel comprises a red light emitting functional layer, and the color film corresponding to the red sub-pixel comprises a red color resistor. The electroluminescent device corresponding to the blue sub-pixel comprises a blue light emitting functional layer, and the color film corresponding to the blue sub-pixel comprises a blue color resistor. The electroluminescent device corresponding to the green sub-pixel comprises a green light emitting functional layer, and the color film corresponding to the green sub-pixel comprises a green resistor.
In a specific implementation, the encapsulation layer may be, for example, a thin film encapsulation layer, where the thin film encapsulation layer may include, for example: the semiconductor device includes a first inorganic encapsulation layer, a second inorganic encapsulation layer, and an organic encapsulation layer between the first inorganic encapsulation layer and the second inorganic encapsulation layer.
According to the display device provided by the embodiment of the application, the color film is arranged on the packaging insulating layer of the three-dimensional touch module, so that the color gamut and the brightness of the display device can be improved.
Optionally, as shown in fig. 10, the orthographic projection of the black matrix covers the orthographic projection of the touch driving electrode, the orthographic projection of the touch sensing electrode, and the orthographic projection of the pressure sensing electrode.
According to the display device provided by the embodiment of the application, the touch driving electrode, the touch sensing electrode and the pressure sensing electrode are arranged in the black matrix shielding area, so that the transmittance and the brightness of the display device are not affected.
In specific implementation, the preparation of the display device provided in the embodiment of the application may include, for example, the following steps:
s201, sequentially depositing a PI film, a first buffer layer and a second buffer layer on the whole surface of a glass substrate;
s202, depositing an active layer by adopting a plasma enhanced chemical vapor deposition (Plasma Enhanced Chemical Vapor Deposition, PECVD) process, and forming a pattern of the active layer by adopting a patterning process;
s203, depositing a GI layer by adopting a PECVD process;
s204, depositing a grid layer by adopting a sputtering (Sputer) process and forming a grid pattern by adopting a patterning process;
s205, forming an interlayer insulating layer by adopting a Coating (Coating) process, and forming a via hole penetrating the interlayer insulating layer and the gate insulating layer and exposing part of the active layer by adopting a patterning process;
the material of the interlayer insulating layer may be, for example, an organic material;
s206, depositing a source and drain electrode layer by adopting a router process, and forming patterns of a source electrode and a drain electrode by adopting a patterning process;
s207, forming a PLN layer, and forming a via hole in the PLN layer by adopting a patterning process;
s208, depositing an anode by adopting a Sputer process and forming a pattern of the anode by adopting a patterning process;
s209, preparing a PDL layer and forming a PDL pattern by adopting patterning process;
s210, vapor plating the luminous functional layer by vapor plating equipment;
s211, evaporating a cathode by adopting evaporation equipment;
s212, preparing a thin film by adopting packaging equipment to perform thin film packaging to form a TFE packaging layer;
s213, preparing an electrode layer by adopting a dispenser low-temperature process, and forming patterns of a touch sensing electrode and a pressure sensing electrode by adopting a patterning process;
s214, coating PVDF by adopting a Coating process, curing the PVDF at a preset temperature for a preset time period to remove the solvent in the PVDF solution, crystallizing the PVDF at a low temperature to form more beta phases, polarizing the PVDF at a high voltage electric field to enable the PVDF to have piezoelectric performance, and finally forming a pattern of a dielectric layer by a patterning process;
s215, forming an electrode layer through a dispenser low-temperature process and forming a pattern of a touch control driving electrode by adopting a patterning process;
s216, forming a packaging insulating layer;
s217, forming a color film and a black matrix, and flattening by using low-temperature OCA glue;
s218, forming cover glass.
In particular implementations, the patterning process may include, for example, photolithography and etching processes.
In practice, the Coating PVDF may be coated, for example, with a rotation of 650 rpm of 30 seconds; the preset temperature for curing the PVDF may be, for example, 80 degrees Celsius (DEG C), and the preset curing time period may be, for example, 20 minutes; the preset temperature for crystallization of PVDF can be 90 ℃, and the preset crystallization time can be, for example; the PVDF polarized high voltage electric field may be, for example, 15 picofarads per Newton (pC/N). In the embodiment of the application, the PVDF dielectric layer is formed in a low-temperature process, and the process temperature is not higher than 110 ℃ in the preparation process of the dielectric layer, so that the performance of the OLED luminous functional layer material is not affected.
In summary, according to the three-dimensional touch module, the driving method thereof and the display device provided by the embodiments of the application, on the basis of realizing the touch driving electrode, the touch sensing electrode and the dielectric layer at the touch position, only the pressure sensing electrode opposite to the touch electrode is arranged on one side of the dielectric layer, which is away from the touch driving electrode, so that the touch pressure detection can be realized, one electrode of the touch pressure detection is multiplexed with the touch driving electrode, the pressure-touch function integration is realized, and therefore, a complex touch pressure detection structure independent of the touch position detection is not required to be arranged, and the structural complexity and the preparation difficulty of the three-dimensional touch module are simplified.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (10)
1. The utility model provides a three-dimensional touch module, its characterized in that, three-dimensional touch module includes: the touch control driving device comprises a plurality of touch control driving electrodes which are arranged in an array, a plurality of touch control sensing electrodes which are arranged in an array, pressure sensing electrodes which are in one-to-one correspondence with the touch control driving electrodes and are oppositely arranged, and a dielectric layer positioned between the touch control driving electrodes and the pressure sensing electrodes;
the touch driving electrode and the touch sensing electrode are not overlapped and insulated from each other, and the pressure sensing electrode and the touch sensing electrode are not overlapped and insulated from each other;
the touch control driving electrode is electrically connected with the first touch control lead wire in a first direction, the touch control induction is electrically connected with the second touch control lead wire in a second direction, the pressure induction electrode is electrically connected with the third touch control lead wire in the first direction, and the first direction and the second direction are intersected.
2. The three-dimensional touch module of claim 1, wherein orthographic projections of the touch driving electrode and the pressure sensing electrode coincide.
3. The three-dimensional touch module of claim 1, wherein the touch sensing electrode and the pressure sensing electrode are located on the same layer;
the three-dimensional touch module further comprises: the first insulating layer is positioned between the touch sensing electrode and the dielectric layer;
the second touch lead includes: and the bridging part is positioned between the first insulating layer and the dielectric layer and is electrically connected with the touch sensing electrode through a via hole penetrating through the first insulating layer.
4. The three-dimensional touch module of claim 1, wherein the touch sensing electrode and the touch driving electrode are located on the same layer;
the three-dimensional touch module further comprises: the second insulating layer is positioned between the touch control driving electrode and the dielectric layer;
the second touch lead includes: and the bridging part is positioned between the second insulating layer and the dielectric layer and is electrically connected with the touch sensing electrode through a via hole penetrating through the second insulating layer.
5. The three-dimensional touch module of claim 1, wherein the material of the dielectric layer comprises: polyvinylidene fluoride; the polyvinylidene fluoride has piezoelectric performance through a low-temperature crystallization process and an electric field polarization process.
6. The three-dimensional touch module of claim 1, wherein the pressure sensing electrode is located on a side of the touch driving electrode facing away from the touch operation.
7. A driving method of the three-dimensional touch module according to any one of claims 1 to 6, comprising:
a touch position detection stage, namely providing a first driving signal for the touch driving electrode, providing a touch position detection signal for the touch sensing electrode, receiving a touch sensing signal fed back by the touch sensing electrode, and determining a touch position according to the touch sensing signal;
and in the touch pressure detection stage, a second driving signal is provided for the touch driving electrode, a touch pressure detection signal is provided for the pressure sensing electrode, a pressure sensing signal fed back by the pressure sensing electrode is received, and the touch pressure is determined according to the pressure sensing signal.
8. A display device, characterized in that the display device comprises: an array substrate, and a three-dimensional touch module according to any one of claims 1 to 6 located above the array substrate.
9. The display device according to claim 8, wherein the array substrate comprises: a substrate, a thin film transistor positioned on the substrate, an electroluminescent device positioned on the thin film transistor, and a packaging layer positioned on the electroluminescent device for sealing the electroluminescent device;
the display device further includes: a color film and a black matrix positioned on the encapsulation layer; the black matrix is provided with an opening area in array arrangement, and the color film is positioned in the opening area;
the three-dimensional touch module is located between the color film and the packaging layer.
10. The display device of claim 9, wherein the orthographic projection of the black matrix covers the orthographic projection of the touch driving electrode, the orthographic projection of the touch sensing electrode, and the orthographic projection of the pressure sensing electrode.
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| CN112198988B (en) * | 2020-11-02 | 2023-11-28 | 深圳市华星光电半导体显示技术有限公司 | Touch screen and electronic equipment |
| CN113176837B (en) * | 2021-04-30 | 2023-03-17 | 深圳市华星光电半导体显示技术有限公司 | Three-dimensional touch sensor and display device |
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