CN106775055B - Flexible touch screen and flexible touch display screen - Google Patents
Flexible touch screen and flexible touch display screen Download PDFInfo
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- CN106775055B CN106775055B CN201611040918.4A CN201611040918A CN106775055B CN 106775055 B CN106775055 B CN 106775055B CN 201611040918 A CN201611040918 A CN 201611040918A CN 106775055 B CN106775055 B CN 106775055B
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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
- G06F3/0412—Digitisers structurally integrated in a display
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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
- G06F2203/04102—Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
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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
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Abstract
The invention relates to a flexible touch screen and a flexible touch display screen. The upper shielding layer is arranged on one side of the flexible cover plate, the touch sensing layer is arranged on one side, away from the flexible cover plate, of the upper shielding layer, the lower shielding layer is arranged on one side, away from the flexible cover plate, of the touch sensing layer, and the piezoelectric film is arranged between the upper shielding layer and the lower shielding layer. The method comprises the steps of detecting signals in a time-sharing detection mode, obtaining touch operation signals or suspension touch signals by detecting capacitance changes of a touch sensing layer in one time period, and obtaining pressure sensing signals by detecting piezoelectric charges generated by a piezoelectric film in another adjacent time period. Any two layers of the upper shielding layer, the lower shielding layer and the touch sensing layer are selected as a ground electrode and a detection electrode for detecting pressure, the floating touch and pressure sensing functions can be integrated on the touch screen without additionally adding electrodes, and the thickness and the weight of the integrated touch screen are reduced.
Description
Technical Field
The invention relates to the technical field of touch display, in particular to a flexible touch screen and a flexible touch display screen.
Background
Touch screens have been widely used for intelligent human-computer interaction interfaces, providing great convenience for the life of people. Electronic devices with touch display screens, such as smart phones, tablet computers, smart cars, and the like, have been highly integrated into our lives. The touch display screen can realize multi-point interaction and can realize more complex operation. The existing user experience is no longer satisfied with the touch sensing in the touch plane, the floating touch above the touch plane can be sensed, the pressure sensing touch sensing for sensing the touch force becomes a new pursuit, and the touch sensing device has a wide prospect in the fields of office work, games, drawing and the like.
However, the floating touch technology and the pressure sensing touch technology for touch in a direction perpendicular to the touch screen each proceed in a different direction. When the functions of the touch screen and the touch screen are integrated on the touch screen, the components with the two functions are overlapped, so that the thickness and the weight of the touch screen are increased greatly, and the aim of lightening and ultrathin is against.
Disclosure of Invention
In view of the above, it is necessary to provide a flexible touch screen and a flexible touch display screen that can effectively reduce the thickness.
A flexible touch screen, comprising:
a flexible cover plate;
the upper shielding layer is arranged on one side of the flexible cover plate;
the touch sensing layer is arranged on one side, away from the flexible cover plate, of the upper shielding layer;
the lower shielding layer is arranged on one side, away from the flexible cover plate, of the touch sensing layer, and the touch sensing layer is positioned between the upper shielding layer and the lower shielding layer; and
the piezoelectric film is arranged between the upper shielding layer and the lower shielding layer and used for detecting pressure;
any two layers of the upper shielding layer, the touch sensing layer and the lower shielding layer are respectively used as a ground electrode and a detection electrode for detecting pressure.
In one embodiment, the piezoelectric film is a layer;
when the piezoelectric film is arranged between the upper shielding layer and the touch sensing layer, the upper shielding layer is used as a ground electrode for detecting pressure, and the touch sensing layer is used as a detection electrode for detecting pressure;
when the piezoelectric film is arranged between the touch sensing layer and the lower shielding layer, the lower shielding layer is used as a ground electrode for detecting pressure, and the touch sensing layer is used as a detection electrode for detecting pressure.
In one embodiment, the piezoelectric film is two layers, namely a first piezoelectric film and a second piezoelectric film, the first piezoelectric film is disposed between the upper shielding layer and the touch sensing layer, and the second piezoelectric film is disposed between the touch sensing layer and the lower shielding layer; the upper layer shielding layer or the lower layer shielding layer is used as a ground electrode for detecting pressure, and the corresponding lower layer shielding layer or the upper layer shielding layer is used as a detection electrode for detecting pressure.
In one embodiment, the material of the piezoelectric film is a thermoelectric material or a non-thermoelectric material;
when the piezoelectric film is made of a non-thermoelectric material, the polarization directions of the first piezoelectric film and the second piezoelectric film are the same;
when the piezoelectric film is made of a pyroelectric material, the polarization directions of the first piezoelectric film and the second piezoelectric film are the same or opposite.
In one embodiment, the lower shielding layer includes a conductive film, a first wire surrounding an outer edge of the conductive film, the first wire having a lower resistivity than the conductive film, and a first connection terminal disposed on the first wire for connection with a flexible circuit board.
In one embodiment, the touch sensing layer includes a plurality of electrode blocks and electrode leads, which are disposed at intervals, and one end of each electrode lead is connected to the electrode block.
In one embodiment, the electrode blocks are triangular, diamond-shaped, hexagonal or fork-shaped.
In one embodiment, the upper shielding layer comprises a conductive layer, a second wire and a second connecting terminal, the conductive layer comprises a shielding part and a hollow part, the shielding part corresponds to the electrode lead, the hollow part corresponds to the electrode block, the hollow part is blank or is provided with a filling block, the filling block and the shielding part are spaced to be insulated from each other, the second wire surrounds the outer edge of the conductive layer, the resistivity of the second wire is lower than that of the conductive layer, and the second connecting terminal is arranged on the second wire and used for connecting the flexible circuit board.
In one embodiment, the flexible cover plate further comprises a transparent substrate, the lower shielding layer comprises a first side and a second side which are oppositely arranged, and the first side is the side close to the flexible cover plate;
when the piezoelectric film is arranged between the upper shielding layer and the touch sensing layer, the transparent substrate is arranged on the first side or the second side of the lower shielding layer;
when the piezoelectric film is arranged between the touch sensing layer and the lower shielding layer, the transparent substrate is arranged on the first side of the lower shielding layer.
A flexible touch display screen comprising:
a flexible touch screen as described in any of the above; and
and the flexible display is arranged on one side, away from the flexible cover plate, of the lower shielding layer.
The flexible touch screen and the flexible touch display screen at least have the following advantages:
and (3) detecting signals by adopting a time-sharing detection mode: acquiring a touch operation signal or a suspension touch signal by detecting capacitance change of the touch sensing layer within a time period; and acquiring a pressure induction signal by detecting piezoelectric charges generated by the piezoelectric film in another adjacent time period. Any two layers of the upper shielding layer, the touch sensing layer and the lower shielding layer are used as a ground electrode and a detection electrode for detecting pressure, after the piezoelectric film is stressed, heterogeneous charges are generated on the surfaces of the two sides of the piezoelectric film, and further, the generated potential difference is used as a pressure sensing signal. The floating touch and pressure sensing functions can be integrated on the touch screen without adding extra electrodes, the thickness and the weight of the integrated touch screen are reduced, all parts of the flexible touch display screen are flexible, the reliability requirements of the flexible touch display screen in the aspect of flexible display and the like can be met, and the phenomena of cracking, dislocation and the like of the laminated layer in the non-planar application can be prevented.
Drawings
Fig. 1 is a sectional view of a flexible touch display screen in a first embodiment;
fig. 2 is a sectional view of a flexible touch display screen in a second embodiment;
fig. 3 is a sectional view of a flexible touch display screen in a third embodiment;
fig. 4 is a sectional view of a flexible touch display screen in a fourth embodiment;
fig. 5 is a sectional view of a flexible touch display screen in a fifth embodiment;
fig. 6 is a sectional view of a flexible touch display screen in a sixth embodiment;
fig. 7 is a sectional view of a flexible touch display screen in a seventh embodiment;
FIG. 8 is a schematic diagram of a structure of a lower shield layer according to one embodiment;
FIG. 9 is a schematic structural diagram of a touch sensing layer according to an embodiment;
FIGS. 10-13 are schematic structural views of four embodiments of electrode blocks;
FIG. 14 is a schematic diagram of an upper shield layer according to an embodiment
FIG. 15 is a schematic structural diagram of an upper shield layer in another embodiment;
fig. 16 is a partial enlarged view of the upper shield layer of fig. 15.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
As shown in fig. 1, a cross-sectional view of a flexible touch display 100 according to a first embodiment is shown. The flexible touch display screen 100 shown in fig. 1 includes a flexible touch screen 110, a flexible display 120, and an optically transparent adhesive 130.
The flexible touch screen 110 includes a flexible cover 111, an upper shielding layer 112, a piezoelectric film 113, a touch sensing layer 114, and a lower shielding layer 115. Specifically, in the present embodiment, the number of piezoelectric thin films 113 is one.
The upper shielding layer 112 is disposed on one side of the flexible cover plate 111, the touch sensing layer 114 is disposed on one side of the upper shielding layer 112 away from the flexible cover plate 111, the piezoelectric film 113 is disposed between the upper shielding layer 112 and the touch sensing layer 114, and the lower shielding layer 115 is disposed on one side of the touch sensing layer 114 away from the flexible cover plate 111. The flexible display 120 is disposed on a side of the lower shielding layer 115 away from the flexible cover 111.
Specifically, in the present embodiment, the upper shielding layer 112 is disposed on the surface of the piezoelectric film 113 close to the flexible cover 111, the touch sensing layer 114 is disposed on the surface of the piezoelectric film 113 far from the flexible cover 111, and the lower shielding layer 115 is disposed on the surface of the flexible display 120 close to the flexible cover 111.
The optically clear adhesive 130 includes an upper layer of optically clear adhesive 132 and a lower layer of optically clear adhesive 134. The flexible cover plate 111 and the upper shielding layer 112 are bonded through an upper optically transparent adhesive 132, and the touch sensing layer 114 and the lower shielding layer 115 are bonded through a lower optically transparent adhesive 134, so that the flexible touch display screen 100 is formed in a laminated manner.
In other embodiments, the upper shielding layer 112 may also be disposed on the surface of the flexible cover 111. Specifically, the upper shielding layer 112 is disposed on a surface of the flexible cover 111 close to the piezoelectric film 113, the touch sensing layer 114 is disposed on a surface of the piezoelectric film 113 far from the flexible cover 111, and the lower shielding layer 115 is disposed on a surface of the flexible display 120 close to the flexible cover 111. The upper shielding layer 112 and the piezoelectric film 113 are bonded through an upper optically transparent adhesive 132, and the touch sensing layer 114 and the lower shielding layer 115 are bonded through a lower optically transparent adhesive 134, so that the flexible touch display screen 100 is formed by lamination.
The flexible touch display panel 100 of the present embodiment detects signals in a time-division detection manner: detecting the capacitance change of the touch sensing layer 114 in a time period to obtain a touch operation signal or a floating touch signal; the pressure-induced signal is obtained by detecting the piezoelectric charge generated by the piezoelectric film 113 in another adjacent time period. The upper shielding layer 112 is used as a ground electrode for detecting pressure, the touch sensing layer 114 is used as a detection electrode for detecting pressure, and after the piezoelectric film 113 is subjected to pressure, heterogeneous charges are generated on the surfaces of the two sides of the piezoelectric film 113, and further, the generated potential difference is used as a pressure sensing signal. The floating touch and pressure sensing functions can be integrated on the touch screen without adding extra electrodes, the thickness and the weight of the integrated touch screen are reduced, all parts of the flexible touch display screen 100 are flexible, the reliability requirements of the flexible touch display screen 100 in the aspect of flexible display and the like can be met, and the phenomena of lamination cracking, dislocation and the like in non-planar application can be prevented.
As shown in fig. 2, a cross-sectional view of a flexible touch display 200 according to a second embodiment is shown. The flexible touch display screen 200 shown in fig. 2 includes a flexible touch screen 210, a flexible display 220, and an optically transparent adhesive 230.
The flexible touch screen 210 includes a flexible cover 211, an upper shield layer 212, a touch sensing layer 213, a piezoelectric film 214, and a lower shield layer 215. Specifically, in the present embodiment, the number of piezoelectric thin films 214 is one.
The upper shielding layer 212 is disposed on one side of the flexible cover 111, the touch sensing layer 213 is disposed on one side of the upper shielding layer 212 away from the flexible cover 211, the lower shielding layer 215 is disposed on one side of the touch sensing layer 213 away from the flexible cover 211, the touch sensing layer 213 is disposed between the upper shielding layer 212 and the lower shielding layer 215, and the piezoelectric film 214 is disposed between the touch sensing layer 213 and the lower shielding layer 215. The flexible display 220 is disposed on a side of the lower shielding layer 215 away from the flexible cover 211.
Specifically, in the present embodiment, the upper shielding layer 212 is disposed on the surface of the flexible cover 211 close to the piezoelectric film 214, the touch sensing layer 213 is disposed on the surface of the piezoelectric film 214 close to the flexible cover 211, and the lower shielding layer 215 is disposed on the surface of the piezoelectric film 214 far from the flexible cover 211.
The optically clear adhesive 230 includes an upper layer of optically clear adhesive 232 and a lower layer of optically clear adhesive 234. The upper shielding layer 212 and the touch sensing layer 213 are bonded by an upper optically transparent adhesive 232, and the lower shielding layer 215 and the flexible display 220 are bonded by a lower optically transparent adhesive 234, so that the flexible touch display screen 200 is formed by lamination.
In other embodiments, the lower shielding layer 215 may also be disposed on the surface of the flexible display 220. Specifically, the upper shielding layer 212 is disposed on a surface of the flexible cover 211 close to the piezoelectric film 214, the touch sensing layer 213 is disposed on a surface of the piezoelectric film 214 close to the flexible cover 211, and the lower shielding layer 215 is disposed on a surface of the flexible display 220 close to the flexible cover 211. The upper shielding layer 212 and the touch sensing layer 213 are bonded by an upper optical transparent adhesive 232, and the piezoelectric film 214 and the lower shielding layer 215 are bonded by a lower optical transparent adhesive 234, so that the flexible touch display screen 200 is formed by lamination.
The flexible touch display 200 of the present embodiment detects signals in a time-sharing detection manner: acquiring a touch operation signal or a floating touch signal by detecting capacitance change of the touch sensing layer 213 within a time period; the pressure-induced signal is obtained by detecting the piezoelectric charge generated by the piezoelectric film 214 during another period of time. The lower shielding layer 215 is used as a ground electrode for detecting pressure, the touch sensing layer 213 is used as a detection electrode for detecting pressure, and after the piezoelectric film 214 is pressed, different charges are generated on the surfaces of the two sides of the piezoelectric film 214, and further, the generated potential difference is used as a pressure sensing signal. The floating touch and pressure induction functions can be integrated on the touch screen without extra electrodes, the thickness and weight of the integrated touch screen are reduced, all parts of the flexible touch display screen 200 are flexible, the reliability requirements of the flexible touch display screen 200 in the aspect of flexible display and the like can be met, and the phenomena of lamination cracking, dislocation and the like in non-planar application can be prevented.
As shown in fig. 3, a cross-sectional view of a flexible touch display 300 according to a third embodiment is shown. The flexible touch display screen 300 shown in fig. 3 includes a flexible touch screen 310, a flexible display 320, and an optically clear adhesive 330.
The flexible touch screen 310 includes a flexible cover 311, an upper shield layer 312, a touch sensing layer 314, a lower shield layer 316, and a piezoelectric film. Specifically, in the present embodiment, the number of piezoelectric thin films is two, and the number of piezoelectric thin films is the first piezoelectric thin film 313 and the second piezoelectric thin film 315.
The upper shielding layer 312 is disposed on one side of the flexible cover 311, the touch sensing layer 314 is disposed on one side of the upper shielding layer 312 away from the flexible cover 311, the lower shielding layer 316 is disposed on one side of the touch sensing layer 314 away from the flexible cover 311, and the touch sensing layer 314 is disposed between the upper shielding layer 312 and the lower shielding layer 316. The first piezoelectric film 313 is disposed between the upper shielding layer 312 and the touch sensing layer 314, and the second piezoelectric film 315 is disposed between the touch sensing layer 314 and the lower shielding layer 316. The flexible display 320 is disposed on a side of the lower shielding layer 316 away from the flexible cover 311.
Specifically, in the present embodiment, the upper shielding layer 312 is disposed on a surface of the flexible cover 311 close to the first piezoelectric film 313, the touch sensing layer 314 is disposed on a surface of the first piezoelectric film 313 far from the flexible cover 311, and the lower shielding layer 316 is disposed on a surface of the flexible display 320 close to the flexible cover 311.
The optically clear adhesive 330 includes an upper layer of optically clear adhesive 332, an intermediate layer of optically clear adhesive 334, and a lower layer of optically clear adhesive 336. The upper shielding layer 312 and the first piezoelectric film 313 are bonded by an upper optical transparent adhesive 332, the touch sensing layer 314 and the second piezoelectric film 315 are bonded by an intermediate optical transparent adhesive 334, and the second piezoelectric film 315 and the lower shielding layer 316 are bonded by a lower optical transparent adhesive 336, so that the flexible display screen 300 is formed by stacking.
In other embodiments, the touch sensing layer 314 can also be disposed on the surface of the second piezoelectric film 315. Specifically, the upper shielding layer 312 is disposed on a surface of the flexible cover 311 near the first piezoelectric film 313, the touch sensing layer 314 is disposed on a surface of the second piezoelectric film 315 near the flexible cover 311, and the lower shielding layer 316 is disposed on a surface of the flexible display 320 near the flexible cover 311. The upper shielding layer 312 and the first piezoelectric film 313 are bonded by an upper optical transparent adhesive 332, the first piezoelectric film 313 and the touch sensing layer 314 are bonded by an intermediate optical transparent adhesive 334, and the second piezoelectric film 315 and the lower shielding layer 316 are bonded by a lower optical transparent adhesive 336, so that the flexible display screen 300 is formed by stacking.
As shown in fig. 4, a cross-sectional view of a flexible touch display screen 400 according to a fourth embodiment is shown. The flexible touch display screen 400 shown in FIG. 4 includes a flexible touch screen 410, a flexible display 420, and an optically clear adhesive 430.
The flexible touch screen 410 includes a flexible cover 411, an upper shield layer 412, a touch sensing layer 414, a lower shield layer 416, and a piezoelectric film. Specifically, in the present embodiment, the number of piezoelectric thin films is two, and the number of piezoelectric thin films is the first piezoelectric thin film 413 and the second piezoelectric thin film 415.
The upper shielding layer 412 is disposed on one side of the flexible cover 411, the touch sensing layer 414 is disposed on one side of the upper shielding layer 412 away from the flexible cover 411, the lower shielding layer 416 is disposed on one side of the touch sensing layer 414 away from the flexible cover 311, and the touch sensing layer 414 is disposed between the upper shielding layer 412 and the lower shielding layer 416. The first piezoelectric film 413 is disposed between the upper shielding layer 412 and the touch sensing layer 414, and the second piezoelectric film 415 is disposed between the touch sensing layer 414 and the lower shielding layer 416. The flexible display 420 is disposed on a side of the lower shielding layer 416 away from the flexible cover 411.
Specifically, in the present embodiment, the upper shielding layer 412 is disposed on the surface of the flexible cover 411 on the side close to the first piezoelectric film 413, the touch sensing layer 414 is disposed on the surface of the first piezoelectric film 413 on the side far from the flexible cover 411, and the lower shielding layer 416 is disposed on the surface of the second piezoelectric film 415 on the side far from the flexible cover 411.
The optically clear adhesive 430 includes an upper optically clear adhesive 432, a middle optically clear adhesive 434, and a lower optically clear adhesive 436. The upper shielding layer 412 and the first piezoelectric film 413 are bonded through an upper optical transparent adhesive 432, the touch sensing layer 414 and the second piezoelectric film 415 are bonded through an intermediate optical transparent adhesive 434, and the lower shielding layer 416 and the flexible display 420 are bonded through a lower optical transparent adhesive 436, so that the flexible display screen 400 is formed by stacking.
In other embodiments, the upper shielding layer 412 may be further disposed on the surface of the first piezoelectric film 413, and the touch sensing layer may be further disposed on the surface of the second piezoelectric film 415. Specifically, the upper shielding layer 412 is disposed on a surface of the first piezoelectric film 413 close to the flexible cover 411, the touch sensing layer 414 is disposed on a surface of the second piezoelectric film 415 close to the flexible cover 411, and the lower shielding layer 416 is disposed on a surface of the flexible display 420 close to the flexible cover 411. The flexible cover 411 and the upper shielding layer 412 are bonded through an upper optical transparent adhesive 432, the first piezoelectric film 413 and the touch sensing layer 414 are bonded through an intermediate optical transparent adhesive 434, and the second piezoelectric film 415 and the lower shielding layer 416 are bonded through a lower optical transparent adhesive 436, so that the flexible display screen 400 is formed in a stacked manner.
The flexible touch display screen 300 and the flexible touch display screen 400 of the above embodiments use two piezoelectric films, and when the piezoelectric films are non-thermoelectric materials, the polarization directions of the two piezoelectric films are the same; when the piezoelectric thin film material is a pyroelectric material, the polarization directions of the two piezoelectric thin films can be the same, and the polarization directions can also be opposite. When the polarization directions of the two piezoelectric films are opposite, the occurrence of false signals caused by temperature changes introduced when a finger touches the piezoelectric film can be prevented; when the polarization directions of the two piezoelectric films are the same, the pressure sensing signal can be enhanced.
The flexible touch display 300 and the flexible touch display 400 of the above embodiments adopt a time-sharing detection method to detect signals: acquiring a touch operation signal or a suspension touch signal by detecting capacitance change of the touch sensing layer within a time period; and acquiring a pressure induction signal by detecting piezoelectric charges generated by the piezoelectric film in another adjacent time period. The lower shielding layer or the upper shielding layer is used as a ground electrode for detecting pressure, the corresponding upper shielding layer or the lower shielding layer is used as a detection electrode for detecting pressure, after the two piezoelectric films are stressed, heterogeneous charges are generated on the surfaces of the two sides of the piezoelectric films, and then the generated potential difference is used as a pressure induction signal. The floating touch and pressure sensing functions can be integrated on the touch screen without adding extra electrodes, the thickness and the weight of the integrated touch screen are reduced, all parts of the flexible touch display screen are flexible, the reliability requirements of the flexible touch display screen in the aspect of flexible display and the like can be met, and the phenomena of cracking, dislocation and the like of the laminated layer in the non-planar application can be prevented.
As shown in fig. 5, a cross-sectional view of a flexible touch display 500 according to a fifth embodiment is shown. The flexible touch display screen 500 shown in fig. 5 includes a flexible touch screen 510, a flexible display 520, and an optically clear adhesive 530.
The flexible touch screen 510 includes a flexible cover 511, an upper shielding layer 512, a piezoelectric film 513, a touch sensing layer 514, a lower shielding layer 515, and a transparent substrate 516. Specifically, in this embodiment, the number of piezoelectric thin films 513 is one.
The upper shielding layer 512 is disposed on one side of the flexible cover 511, the touch sensing layer 514 is disposed on one side of the upper shielding layer 512 away from the flexible cover 511, the piezoelectric film 513 is disposed between the upper shielding layer 512 and the touch sensing layer 514, the lower shielding layer 515 is disposed on one side of the touch sensing layer 514 away from the flexible cover 511, and the transparent substrate 516 is disposed on one side of the lower shielding layer 515 away from the flexible cover 511. The flexible display 520 is disposed on a side of the transparent substrate 516 away from the flexible cover 511.
Specifically, in the present embodiment, the upper shielding layer 512 is disposed on the surface of the piezoelectric film 513 close to the flexible cover 511, the touch sensing layer 514 is disposed on the surface of the piezoelectric film 513 away from the flexible cover 511, and the lower shielding layer 515 is disposed on the surface of the transparent substrate 516 close to the flexible cover 511.
The optically clear adhesive 530 includes an upper optically clear adhesive 532, an intermediate optically clear adhesive 534, and a lower optically clear adhesive 536. The flexible cover plate 511 and the upper shielding layer 512 are bonded through an upper optical transparent adhesive 532, the touch sensing layer 514 and the lower shielding layer 515 are bonded through an intermediate optical transparent adhesive 534, and the transparent substrate 516 and the flexible display 520 are bonded through a lower optical transparent adhesive 536, so that the flexible touch display screen 500 is formed by stacking.
In other embodiments, the lower shielding layer 515 may also be disposed on the surface of the other side of the transparent substrate 516. Specifically, the upper shielding layer 512 is disposed on a surface of the piezoelectric film 513 close to the flexible cover 511, the touch sensing layer 514 is disposed on a surface of the piezoelectric film 513 far from the flexible cover 511, and the lower shielding layer 515 is disposed on a surface of the transparent substrate 516 far from the flexible cover 511. The flexible cover plate 511 and the upper shielding layer 512 are bonded through an upper optical transparent adhesive 532, the touch sensing layer 514 and the transparent substrate 516 are bonded through an intermediate optical transparent adhesive 534, and the upper shielding layer 515 and the flexible display 520 are bonded through a lower optical transparent adhesive 536, so that the flexible touch display screen 500 is formed by stacking.
As shown in fig. 6, a sectional view of a flexible touch display 600 according to a sixth embodiment is shown. The flexible touch display screen 600 shown in fig. 6 includes a flexible touch screen 610, a flexible display 620, and an optically clear adhesive 630.
The flexible touch panel 610 includes a flexible cover 611, an upper shielding layer 612, a piezoelectric film 613, a touch sensing layer 614, a lower shielding layer 615, and a transparent substrate 616. Specifically, in this embodiment, the number of piezoelectric films 613 is one.
The upper shielding layer 612 is disposed on one side of the flexible cover 611, the touch sensing layer 614 is disposed on one side of the upper shielding layer 612 away from the flexible cover 611, the piezoelectric film 613 is disposed between the upper shielding layer 612 and the touch sensing layer 614, the lower shielding layer 615 is disposed on one side of the touch sensing layer 614 away from the flexible cover 611, and the transparent substrate 616 is disposed on one side of the lower shielding layer 615 away from the flexible cover 611. The flexible display 620 is disposed on a side of the transparent substrate 616 away from the flexible cover 611.
Specifically, in the present embodiment, the upper shielding layer 612 is disposed on the surface of the flexible cover 611 close to the side of the piezoelectric film 613, the touch sensing layer 614 is disposed on the surface of the piezoelectric film 613 away from the side of the flexible cover 611, and the lower shielding layer 615 is disposed on the surface of the transparent substrate 616 close to the side of the flexible cover 611.
The optically clear adhesive 630 includes an upper layer of optically clear adhesive 632, an intermediate layer of optically clear adhesive 634, and a lower layer of optically clear adhesive 636. The upper shielding layer 612 and the piezoelectric film 613 are bonded by an upper optical transparent adhesive 632, the touch sensing layer 614 and the lower shielding layer 615 are bonded by an intermediate optical transparent adhesive 634, and the transparent substrate 616 and the flexible display 620 are bonded by a lower optical transparent adhesive 636, so that the flexible touch display 600 is formed by stacking.
In other embodiments, the lower shielding layer 615 may also be disposed on the surface of the other side of the transparent substrate 616. Specifically, the upper shielding layer 612 is disposed on a surface of the flexible cover 611 close to the side of the piezoelectric film 613, the touch sensing layer 614 is disposed on a surface of the piezoelectric film 613 away from the side of the flexible cover 611, and the lower shielding layer 615 is disposed on a surface of the transparent substrate 616 away from the side of the flexible cover 611. The upper shielding layer 612 and the piezoelectric film 613 are bonded by an upper optical transparent adhesive 632, the touch sensing layer 614 and the transparent substrate 616 are bonded by an intermediate optical transparent adhesive 634, and the upper shielding layer 615 and the flexible display 620 are bonded by a lower optical transparent adhesive 636, so that the flexible touch display 600 is formed by stacking.
As shown in fig. 7, a sectional view of a flexible touch display 700 according to a seventh embodiment is shown. The flexible touch display screen 700 shown in fig. 7 includes a flexible touch screen 710, a flexible display 720, and an optically clear adhesive 730.
The flexible touch screen 710 includes a flexible cover 711, an upper shielding layer 712, a touch sensing layer 713, a piezoelectric film 714, a lower shielding layer 715, and a transparent substrate 716. Specifically, in this embodiment, the number of piezoelectric thin films 714 is one.
The upper shielding layer 712 is disposed on one side of the flexible cover 711, the touch sensing layer 713 is disposed on one side of the upper shielding layer 712 away from the flexible cover 711, the lower shielding layer 715 is disposed on one side of the touch sensing layer 713 away from the flexible cover 711, the piezoelectric film 714 is disposed between the touch sensing layer 713 and the lower shielding layer 715, and the transparent substrate 716 is disposed on one side of the lower shielding layer 715 away from the flexible cover 711. The flexible display 720 is disposed on a side of the transparent substrate 716 away from the flexible cover 711.
Specifically, in this embodiment, the upper shielding layer 712 is disposed on the surface of the flexible cover 711 near the flexible display 720, the touch sensing layer 713 is disposed on the surface of the piezoelectric film 714 near the flexible cover 711, and the lower shielding layer 715 is disposed on the surface of the transparent substrate 716 near the flexible cover 711.
The optically clear adhesive 730 includes an upper layer of optically clear adhesive 732, an intermediate layer of optically clear adhesive 734, and a lower layer of optically clear adhesive 736. The upper shielding layer 712 and the touch sensing layer 713 are bonded through an upper optical transparent adhesive 732, the piezoelectric film 714 and the lower shielding layer 715 are bonded through an intermediate optical transparent adhesive 734, and the transparent substrate 716 and the flexible display 720 are bonded through a lower optical transparent adhesive 736, so that the flexible touch display 700 is formed by stacking.
The flexible touch display screen 500, the flexible touch screen 600, and the flexible touch display screen 700 according to the above embodiments perform signal detection in a time-sharing detection manner: acquiring a touch operation signal or a suspension touch signal by detecting capacitance change of the touch sensing layer within a time period; and acquiring a pressure induction signal by detecting piezoelectric charges generated by the piezoelectric film in another adjacent time period. The upper shielding layer or the lower shielding layer is used as a ground electrode for detecting pressure, the touch sensing layer is used as a detection electrode for detecting pressure, after the piezoelectric film is stressed, heterogeneous charges are generated on the surfaces of the two sides of the piezoelectric film, and further, the generated potential difference is used as a pressure sensing signal. The floating touch and pressure sensing functions can be integrated on the touch screen without adding extra electrodes, the thickness and the weight of the integrated touch screen are reduced, all parts of the flexible touch display screen are flexible, the reliability requirements of the flexible touch display screen in the aspect of flexible display and the like can be met, and the phenomena of cracking, dislocation and the like of the laminated layer in the non-planar application can be prevented. The lower shielding layer is arranged on the surface of the transparent substrate, so that an electrode does not need to be manufactured on the flexible display, the manufacturing steps of the flexible display cannot be increased, and the reliability of the flexible display cannot be influenced.
Fig. 8 is a schematic structural diagram of a lower shield layer 116 according to an embodiment. The lower shield layer 116 serves to entirely shield signal interference due to coupling capacitance between the touch-sensitive and pressure-sensitive areas and other areas. The lower shield layer 116 shown in fig. 8 includes a conductive film 1161, a first wire 1162, and a first connection terminal 1163.
The conductive film 1161 is made of a whole conductive film material, which may be a transparent conductive material such as a nano silver wire, a metal grid, a carbon nanotube, graphene, polyethylenedioxythiophene and derivatives thereof, a mixture of a nano silver wire and a conductive polymer, zinc oxide, tin oxide, indium oxide, or the like. The conductive film 1161 can be formed by evaporation, sputtering, direct coating, or the like.
The first wiring 1162 surrounds the outer edge of the conductive film 1161, and the resistivity of the material of the first wiring 1162 is lower than that of the material of the conductive film 1161, so that the shielding effect can be enhanced. The first connection terminal 1163 is disposed on the first conductive line 1162 for connecting with a flexible circuit board (not shown). The first wire 1162 and the first connection terminal 1163 may be obtained by silk-screening, laser or etching a silver paste, a metal alloy, or the like. Specifically, in this embodiment, the first wires 1162 and the first connecting terminals 1163 are made of silk-screen silver paste. It is to be understood that, in other embodiments, the first conductive line 1162 may not be provided, and the first connection terminal 1163 may be provided on the side of the conductive film 1161.
Fig. 9 is a schematic structural diagram of the touch sensing layer 117 according to an embodiment. The touch sensing layer 117 shown in fig. 9 includes a plurality of electrode blocks 1171 and electrode leads 1172 spaced apart from each other.
The electrode blocks 1171 are used for sensing touch operation and floating touch above the screen, and the positions of the electrode blocks 1171 are determined, so that multi-touch can be realized. As shown in fig. 10-13, the electrode block 1171 may take any shape that conveniently covers the entire area, such as a triangle 1171a, a diamond 1171b, a hexagon 1171c, a fork 1171d, and the like. The electrode block 1171 may be made of silver nanowires, metal grids, carbon nanotubes, graphene, polyethylenedioxythiophene and derivatives thereof, a mixture of silver nanowires and conductive polymers, zinc oxide, tin oxide, indium oxide, or other transparent conductive materials. The electrode block 1171 may be fabricated by laser, etching, or the like.
One end of the electrode lead 1172 is connected to the electrode block 1171 and the other end extends to the edge region to be connected to the flexible circuit board. Specifically, in this embodiment, the material of the electrode lead 1172 is a metal-resin mixture, such as silver paste, metal mesh made of a nano material; metals/metal alloys, such as copper, copper alloys, silver alloys; composite metals such as molybdenum aluminum molybdenum, etc.
Fig. 14 is a schematic structural diagram of an upper shield layer 118 according to an embodiment. The upper shield layer 118 shown in fig. 14 includes a conductive layer 1181, a second conductive line 1182, and a second connection terminal 1183. The conductive layer 1181 includes a shielding portion 1181a and a hollow portion 1181b, and the shielding portion 1181a corresponds to the electrode lead 1172 of the touch sensing layer 117, and is used for shielding the electrode lead 1172 from forming a capacitance with the ground, so as to avoid affecting touch operation and floating touch. The hollowed-out portion 1181b corresponds to the electrode block 1171 so as not to interfere with the normal operation of the electrode block 1171. Specifically, in this embodiment, the hollow-out portion 1181b is blank, and the hollow-out portion 1181b is manufactured by removing all of the conductive layer 1181 and the portion of the conductive layer directly opposite to the electrode block 1171, so as to obtain the hollow-out portion 1181 b.
Fig. 15 is a schematic structural view of an upper shield layer 119 according to another embodiment. The upper shield layer 119 shown in fig. 15 includes a conductive layer 1191, a second wire 1192, and a second connection terminal 1193. The conductive layer 1191 includes a shielding portion 1191a and a hollowed portion 1191 b. The shielding portion 1191a corresponds to the electrode lead 1172 of the touch sensing layer 117, and is configured to shield the electrode lead 1172 from forming a capacitance with the ground, so as to avoid affecting touch operation and floating touch. The hollowed-out portion 1191b corresponds to the electrode block 1171 so as not to interfere with the normal operation of the electrode block 1171.
In the embodiment shown in fig. 15, the hollow 1191b is not blank, but is provided with a filling block. The specific forming mode is as follows: the conductive layer 1191 opposite to the electrode block 1171 may also be retained, but needs to be electrically separated, that is, the conductive layer 1191 opposite to the electrode block 1171 is isolated by laser or etching, and the conductive layer opposite to the electrode block 1171 after isolation is a filling block, so as to ensure that the light transmittance of each part of the visible region is consistent. As shown in fig. 16, which is a partially enlarged view of the upper shield layer after electrical separation, the filler block and the shield portion 1191a are spaced apart from each other so as to be insulated from each other.
The conductive layer 1181 may be made of a transparent conductive material such as a nano silver wire, a metal grid, a carbon nanotube, graphene, polyethylenedioxythiophene and derivatives thereof, a mixture of a nano silver wire and a conductive polymer, zinc oxide, tin oxide, or indium oxide. Conductive layer 1181 may be formed by laser, etching, or direct coating.
The second conductive line 1182 surrounds the outer edge of the conductive layer 1181, and the resistivity of the material of the second conductive line 1182 is lower than that of the material of the conductive layer 1181, so that the shielding effect can be enhanced. The second connection terminal 1183 is disposed on the second conductive line 1182, and is used for connecting to a flexible circuit board (not shown). The second conductive line 1182 and the second connection terminal 1183 may be obtained by silk-screen printing, laser printing, etching, or the like using silver paste, metal alloy, or the like. Specifically, the second conductive line 1182 and the second connection terminal 1183 of the present embodiment are made of silk-screen silver paste. It is understood that, in other embodiments, the second conductive line 1182 may not be provided, and the second connection terminal 1183 may be provided on the edge of the conductive film 1181.
In the flexible touch display screen of each embodiment, the material of the flexible cover plate may be conventional organic materials such as ultra-thin glass, polycarbonate or polymethyl methacrylate, and may also be formed by an organic-inorganic composite material with high surface hardness, so that the flexible touch display screen has good effects of falling resistance, scratch resistance and the like. The piezoelectric film can be a polylactic acid film, a polyvinylidene fluoride film or a PVDF-TrFE copolymer film, and the optical transparent adhesive can be polyacrylic acids, silica gel or water gel optical transparent adhesive.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A flexible touch screen, comprising:
a flexible cover plate;
the upper shielding layer is arranged on one side of the flexible cover plate;
the touch sensing layer is arranged on one side, away from the flexible cover plate, of the upper shielding layer;
the lower shielding layer is arranged on one side, away from the flexible cover plate, of the touch sensing layer, and the touch sensing layer is positioned between the upper shielding layer and the lower shielding layer; the piezoelectric film is arranged between the upper shielding layer and the lower shielding layer and used for detecting pressure;
any two layers of the upper shielding layer, the touch sensing layer and the lower shielding layer are respectively used as a ground electrode and a detection electrode for detecting pressure.
2. The flexible touch screen of claim 1, wherein the piezoelectric film is a layer;
when the piezoelectric film is arranged between the upper shielding layer and the touch sensing layer, the upper shielding layer is used as a ground electrode for detecting pressure, and the touch sensing layer is used as a detection electrode for detecting pressure;
when the piezoelectric film is arranged between the touch sensing layer and the lower shielding layer, the lower shielding layer is used as a ground electrode for detecting pressure, and the touch sensing layer is used as a detection electrode for detecting pressure.
3. The flexible touch screen of claim 1, wherein the piezoelectric film is two layers, namely a first piezoelectric film and a second piezoelectric film, the first piezoelectric film is disposed between the upper shielding layer and the touch sensing layer, and the second piezoelectric film is disposed between the touch sensing layer and the lower shielding layer; the upper layer shielding layer or the lower layer shielding layer is used as a ground electrode for detecting pressure, and the corresponding lower layer shielding layer or the upper layer shielding layer is used as a detection electrode for detecting pressure.
4. The flexible touch screen of claim 3, wherein the material of the piezoelectric film is a pyroelectric material or a non-pyroelectric material;
when the piezoelectric film is made of a non-thermoelectric material, the polarization directions of the first piezoelectric film and the second piezoelectric film are the same;
when the piezoelectric film is made of a pyroelectric material, the polarization directions of the first piezoelectric film and the second piezoelectric film are the same or opposite.
5. The flexible touch screen of claim 1, wherein the lower shielding layer comprises a conductive film, a first conductive line surrounding an outer edge of the conductive film, and a first connection terminal disposed on the first conductive line for connecting to a flexible circuit board, wherein the resistivity of the first conductive line is lower than that of the conductive film.
6. The flexible touch screen of claim 1, wherein the touch sensing layer comprises a plurality of electrode blocks and electrode leads arranged at intervals, and one end of each electrode lead is connected with one electrode block.
7. The flexible touch screen of claim 6, wherein the electrode blocks are triangular, diamond-shaped, hexagonal, or fork-shaped in shape.
8. The flexible touch screen of claim 6, wherein the upper shielding layer comprises a conductive layer, a second wire and a second connecting terminal, the conductive layer comprises a shielding portion and a hollow portion, the shielding portion corresponds to the electrode lead, the hollow portion corresponds to the electrode block, the hollow portion is blank or provided with a filling block, a gap is formed between the filling block and the shielding portion to insulate the filling block and the shielding portion, the second wire surrounds the outer edge of the conductive layer, the resistivity of the second wire is lower than that of the conductive layer, and the second connecting terminal is disposed on the second wire and used for connecting a flexible circuit board.
9. The flexible touch screen of claim 2, further comprising a transparent substrate, wherein the lower shielding layer comprises a first side and a second side that are oppositely disposed, and the first side is a side adjacent to the flexible cover plate;
when the piezoelectric film is arranged between the upper shielding layer and the touch sensing layer, the transparent substrate is arranged on the first side or the second side of the lower shielding layer;
when the piezoelectric film is arranged between the touch sensing layer and the lower shielding layer, the transparent substrate is arranged on the first side of the lower shielding layer.
10. A flexible touch display screen, comprising:
the flexible touch screen of any one of claims 1-9; and
and the flexible display is arranged on one side, away from the flexible cover plate, of the lower shielding layer.
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| CN107704121A (en) * | 2017-08-31 | 2018-02-16 | 京东方科技集团股份有限公司 | Touch display substrate, display device and its control method |
| CN107844223A (en) * | 2017-09-05 | 2018-03-27 | 北京硬壳科技有限公司 | The sensor device of touch and hovering, method and system |
| CN108021284B (en) * | 2017-12-15 | 2019-12-03 | 武汉华星光电半导体显示技术有限公司 | Integrated flexible touch screen and preparation method thereof, OLED display |
| CN108031112A (en) * | 2018-01-16 | 2018-05-15 | 北京硬壳科技有限公司 | Game paddle for control terminal |
| CN108255345A (en) * | 2018-01-25 | 2018-07-06 | 深圳达沃斯光电有限公司 | A kind of flexible capacitance type touch sensor and preparation method thereof |
| CN110416253B (en) * | 2018-04-26 | 2022-05-03 | 上海和辉光电股份有限公司 | Flexible display panel and flexible display device |
| CN108762566A (en) * | 2018-05-30 | 2018-11-06 | 武汉华星光电技术有限公司 | Touch-control display module and display device |
| CN110515496B (en) | 2019-08-30 | 2023-05-26 | 上海中航光电子有限公司 | Touch display panel, working method thereof and touch display device |
| CN110515500B (en) * | 2019-09-02 | 2023-03-03 | 京东方科技集团股份有限公司 | Force sensor and display device |
| CN111176485A (en) * | 2019-12-26 | 2020-05-19 | 武汉华星光电半导体显示技术有限公司 | Self-contained touch display panel |
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