CN106855764B - Touch display device - Google Patents
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- CN106855764B CN106855764B CN201510907413.2A CN201510907413A CN106855764B CN 106855764 B CN106855764 B CN 106855764B CN 201510907413 A CN201510907413 A CN 201510907413A CN 106855764 B CN106855764 B CN 106855764B
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Abstract
The invention relates to a touch display device which comprises a protective cover plate, a touch sensing unit, a pressure sensing unit and a display unit, wherein the pressure sensing unit comprises an upper conductive electrode layer, a lower conductive electrode layer and an elastic layer positioned between the upper conductive electrode layer and the lower conductive electrode layer, and the upper conductive electrode layer and the lower conductive electrode layer are shared with at least one of the electrodes in the touch sensing unit and the display unit or are positioned on the surface of the same substrate. According to the invention, the pressure signal of touch operation is obtained by monitoring the capacitance, the multi-point touch pressure signal can be detected simultaneously, and the elastic layer is introduced, so that the elastic layer can be easily elastically deformed under the stress, and the sensitive detection of touch pressure can be realized. In addition, the conductive electrode layer constituting the capacitive sensor is shared with electrodes in the touch sensing unit or the display unit or is positioned on the same substrate surface, and the thickness of the entire touch display device can be thinned.
Description
Technical Field
The present invention relates to the field of touch display, and in particular, to a touch display device with a pressure sensing function.
Background
The touch screen has the advantages of easy operability, flexibility and the like, and becomes a main man-machine interaction means of personal mobile communication equipment and comprehensive information terminals (such as mobile phones, tablet computers, super notebook computers and the like). Compared with resistive touch screens and touch screens in other modes, capacitive touch screens are gradually widely used by intelligent terminals with the advantages of low cost, simple structure, durability and the like. However, the conventional capacitive touch screen only senses the touch position and operation of the plane where the screen body is located, and it is difficult to sense the touch parameters caused by the pressure change applied to the surface of the screen body.
In order to be able to sense the pressure change at the surface of the screen, the industry integrates pressure sensors within the touch screen. However, most of the existing methods can only detect single-point touch pressure information. Meanwhile, most capacitive pressure sensing schemes require the introduction of multiple layers of conductive electrodes, resulting in significant thickness increases and complex fabrication processes.
Disclosure of Invention
Based on this, the present invention aims to provide a touch display device capable of detecting a multi-touch pressure signal without a significant increase in thickness.
The touch display device comprises a protective cover plate, a touch sensing unit for sensing touch signals applied to the protective cover plate, and a pressure sensing unit for sensing pressure signals applied to the protective cover plate, wherein the pressure sensing unit comprises an upper conductive electrode layer, a lower conductive electrode layer and an elastic layer positioned between the upper conductive electrode layer and the lower conductive electrode layer,
wherein the upper conductive electrode layer and/or the lower conductive electrode layer is shared with at least one of the electrodes in the touch sensing unit and the display unit; or alternatively
The upper conductive electrode layer and/or the lower conductive electrode layer are/is positioned on the same surface of the substrate with at least one of the electrodes in the touch sensing unit and the display unit.
In one embodiment, the electrodes of the touch sensing unit include a touch driving electrode and a touch sensing electrode, and the touch driving electrode and the touch sensing electrode are distributed on the same substrate or respectively distributed on two different substrates.
In one embodiment, the touch sensing unit is integrally provided with the display unit.
In one embodiment, the display unit includes a liquid crystal functional layer and a backlight module, and the electrodes of the display unit include a pixel electrode and a common electrode driving the liquid crystal functional layer.
In one embodiment, the display unit is a thin film transistor display unit, and the electrodes of the display unit further include a gate driving array electrode, a source driving array electrode, and a drain driving electrode, where the drain driving electrode is connected to the pixel electrode.
In one embodiment, the upper conductive electrode layer is shared with the electrode of the display unit, or the upper conductive electrode layer and the electrode of the display unit are positioned on the same surface of the substrate; the lower conductive electrode layer is positioned between the upper conductive electrode layer and the backlight module.
In one embodiment, the lower conductive electrode layer is common to the electrodes of the display unit, or the lower conductive electrode layer is on the same substrate surface as the electrodes of the display unit.
In one embodiment, the upper conductive electrode layer is shared with the electrode of the touch sensing unit, or the upper conductive electrode layer and the electrode of the touch sensing unit are positioned on the same surface of the substrate; the lower conductive electrode layer is positioned between the touch sensing unit and the display unit.
In one embodiment, the upper conductive electrode layer is shared with the electrode of the touch sensing unit, or the upper conductive electrode layer and the electrode of the touch sensing unit are positioned on the same surface of the substrate; the lower conductive electrode layer is shared with the electrode of the display unit, or the lower conductive electrode layer and the electrode of the display unit are positioned on the same surface of the substrate.
In one embodiment, when the upper conductive electrode layer and the electrode of the touch sensing unit are positioned on the same substrate surface, the upper conductive electrode layer and the electrode of the touch sensing unit are separated by a grounded wire.
In one embodiment, the capacitive sensor for detecting force is a self-capacitance or mutual capacitance sensor.
The invention acquires the pressure signal of touch operation by monitoring the capacitance, forms the capacitance sensor for sensing the pressure signal, can detect the multi-point touch pressure signal at the same time, and introduces the elastic layer between the two conductive electrode layers forming the capacitance sensor, and can easily generate elastic deformation under the stress by using the elastic layer, so that the capacitance sensor for detecting the force can generate sensitive capacitance change corresponding to the touch pressure, and finally realizes the sensitive detection of the touch pressure. And the conductive electrode layer forming the capacitance sensor is shared with the electrode in the touch sensing unit or the display unit or is positioned on the surface of the same substrate, so that the thickness of the whole touch display device can be thinned, and meanwhile, the production and assembly flow of the touch display device can be shortened.
Drawings
Fig. 1 to 9 are schematic structural diagrams of a touch display device according to various embodiments of the present invention.
Fig. 10 to 12 are schematic electrode structures of pressure sensing units in a touch display device according to various embodiments of the present invention.
Detailed Description
The touch display device provided by the invention can be used as a display terminal with a touch interaction mode of a mobile phone, a tablet personal computer and the like.
The touch display device comprises a protective cover plate, a touch sensing unit, a display unit and a pressure sensing unit.
The touch sensing unit includes a touch driving electrode and a touch sensing electrode. The touch driving electrodes and the touch sensing electrodes may be distributed on the same substrate, such as GF structures, GF2 structures, etc., as known in the art, or may be distributed on two different substrates, such as GFF structures, as known in the art. In other embodiments, the touch driving electrode and the touch sensing electrode may be formed on the lower surface of the protective cover plate, so that the protective cover plate also has the function of a capacitive sensor, and this structure is referred to as an OGS structure in the industry. The terms "upper" and "lower" refer to the "upper" side relative to the user and the "lower" side relative to the user, relative to the extent to which the touch display device is positioned closer to the user during application. For example, the lower surface of the protective cover refers to the side of the protective cover that is remote from the user. In other embodiments, one of the two touch electrodes may be formed on a surface of the substrate attached to the protective cover, such as a G1F structure.
The display unit comprises a liquid crystal functional layer and a backlight module, wherein the liquid crystal functional layer comprises an upper polaroid, a light filter, a liquid crystal layer, a substrate and a lower polaroid which are sequentially arranged, and the backlight module comprises an upper diffusion sheet, an upper prism sheet, a lower diffusion sheet, a light guide plate and a reflecting sheet which are sequentially arranged. The liquid crystal functional layer further includes a pixel electrode and a common electrode for driving the liquid crystal layer.
Further, the display unit is a thin film transistor display unit, and the liquid crystal layer is driven by using the thin film transistor. The electrodes of the display unit further comprise electrodes connected with the thin film transistor, and specifically comprise a gate driving array electrode, a source driving array electrode and a drain driving electrode. The grid driving array electrode and the source driving array electrode are mutually insulated and arranged on the surface of the substrate, and are respectively correspondingly connected with the grid and the source of each thin film transistor. The drain driving electrode of the thin film transistor is connected to the pixel electrode.
In some embodiments, the pixel electrode and the common electrode are located on the same side of the liquid crystal layer, and the electric field is provided parallel to the liquid crystal layer for driving the liquid crystal, which is also referred to as an In-Plane Switch (IPS) structure In the industry. In other embodiments, the pixel electrode and the common electrode of the liquid crystal layer are respectively located on two sides of the liquid crystal layer, and this structure is referred to as a Twisted Nematic (TN) structure in the industry.
In other embodiments, the touch driving electrode and the touch sensing electrode in the touch sensing unit may be integrated in the display unit, for example, integrated in a liquid crystal layer (the structure of the touch sensing unit is referred to as an in-cell structure in the industry), or the touch driving electrode and the touch sensing electrode are disposed between the upper polarizer and the optical filter (the structure of the touch sensing unit is referred to as an on-cell structure in the industry).
The touch driving electrode and the touch sensing electrode are used for sensing touch signals applied to the protective cover plate. The touch signal includes touch input signals parallel to the two-dimensional direction of the protective cover plate, such as contact, sliding, dragging, etc., and even includes touch input signals perpendicular to the direction of the protective cover plate (i.e., floating touch signals) or the side edges of the edge of the protective cover plate (e.g., curved side edges of a curved screen).
The pressure sensing unit is used for sensing a pressure signal applied to the protective cover plate. The pressure sensing unit includes upper and lower conductive electrode layers constituting a capacitive sensor for sensing a force, and an elastic layer between the upper and lower conductive electrode layers.
The upper conductive electrode layers and the lower conductive electrode layers of the plurality of capacitance sensors forming the detection force are made of transparent conductive materials, such as ITO, znO, carbon nano tubes, graphene and the like; or may be made of a non-transparent conductive material, where the dimensions of the conductive material are controlled to enable the human eye to observe the display content of the touch display device without being affected by the conductive electrode layers. The conductive material can be conductive silver paste, nano silver wires, conductive metal particles or other conductive particles.
The conductive electrode layer in the capacitive sensor for detecting force is formed by an electrode array; the electrode array of the upper conductive electrode layer and the electrode array of the lower conductive electrode layer can be formed by a plurality of mutually independent strip electrodes, or a plurality of chains connected with a plurality of electrode blocks, or mutually independent block electrodes; the projection of the electrode array of the upper conductive electrode layer and the projection of the electrode array of the lower conductive electrode layer in a horizontal two-dimensional plane are provided with a cross area with a certain area, so that a plurality of capacitance sensors which can be used for detecting force are formed.
The pressure sensing unit further includes a first carrier carrying the upper conductive electrode layer and a second carrier carrying the lower conductive electrode layer. The first carrier and the second carrier may be constituted by separate transparent plates, such as glass plates, PET plates, PC plates. In the invention, the upper conductive electrode layer and/or the lower conductive electrode layer are/is shared with at least one of the electrodes in the touch sensing unit and the display unit; or the upper conductive electrode layer and/or the lower conductive electrode layer are/is positioned on the same surface of the substrate with at least one of the electrodes in the touch sensing unit and the display unit. Thus, either the first carrier or the second carrier itself may be a substrate carrying the electrodes of the touch-sensitive unit or a substrate carrying the electrodes of the display unit.
In some embodiments, the upper conductive electrode layer is common to the electrodes of the display unit or the upper conductive electrode layer is on the same substrate surface as the electrodes of the display unit; the lower conductive electrode layer is positioned between the upper conductive electrode layer and the backlight module.
In some embodiments, the lower conductive electrode layer is common to the electrodes of the display unit or the lower conductive electrode layer is on the same substrate surface as the electrodes of the display unit.
In some embodiments, the upper conductive electrode layer is common to the electrodes of the touch sensing unit or the upper conductive electrode layer is on the same substrate surface as the electrodes of the touch sensing unit; the lower conductive electrode layer is positioned between the touch sensing unit and the display unit.
In some embodiments, the upper conductive electrode layer is common to the electrodes of the touch sensing unit or the upper conductive electrode layer is on the same substrate surface as the electrodes of the touch sensing unit; the lower conductive electrode layer is shared with the electrode of the display unit, or the lower conductive electrode layer and the electrode of the display unit are positioned on the same surface of the substrate.
When the upper conductive electrode layer and the electrode of the touch sensing unit are positioned on the same substrate surface, the upper conductive electrode layer and the electrode of the touch sensing unit are separated by a grounded wire, so that the influence of the electrode of the touch sensing unit on the detection function of the pressure input signal is reduced.
The conductive electrode layers of the capacitive sensors for detecting force are shared or partially shared with electrodes of the touch sensing unit or the display unit, and the electrodes need to have different working states to realize different functions. Thus, the touch display device further comprises a processor that causes the common electrode to provide at least a first state in which the common electrode is configured to perform a touch sensing function of the touch sensing unit itself or to perform a display function of the display unit itself, and a second state in which the common electrode is configured as an electrode of a number of capacitive sensors that detect a force, for performing a detection function of a pressure signal. When the pressure sensing unit, the touch sensing unit and the display unit of the capacitance sensors forming the detection force have the common electrode at the same time, the processor needs to make the common electrode provide at least three working states so as to avoid the influence of the respective functions.
The touch display device further comprises a processor, wherein the processor is used for controlling the working time sequence of the conductive electrode layers of the capacitive sensors of the detection force to be staggered with the working time sequence of the touch driving electrode and the touch sensing electrode or the electrodes in the display unit, so that the detection of the pressure signal and the sensing of the touch signal or the functions of the display unit are not interfered with each other.
When the surface of the touch display device is pressed by touch, the elastic layer generates corresponding elastic compression according to the touch force value information and the touch position, and after the touch pressing is removed, the elastic layer can be restored to an initial state or a state close to the initial state. When the touch display device is pressed, a distance between the upper conductive electrode layer and the lower conductive electrode layer of the capacitive sensor constituting the detection force is reduced at a position where the force is applied due to the compression of the elastic layer, and the degree of reduction corresponds to the value of the applied force. The detection of touch pressure on a touch display device can thus be achieved by detecting the capacitance change of the aforementioned capacitive sensor.
Specifically, after the touch display device is stressed, the distance between the upper conductive electrode layer and the lower conductive electrode layer may be reduced to different degrees according to different pressures. According to the calculation formula c=εs/4pi kd of the capacitance, the capacitance value of the formed capacitive sensor becomes larger accordingly. The different touch forces on the touch display device cause corresponding strain at each position of the touch display device, and thus corresponding change of d value is generated. Therefore, a correlation database of capacitance change information of a plurality of capacitance sensors formed in the pressure sensing unit in the touch display device and stress information of the touch display device can be established. In practical application, the touch display device further comprises a memory and a processor, wherein the memory stores capacitance change information of each capacitance sensor for detecting force in the touch display device when different force values are touched at different positions in the touch display device, and the processor is used for comparing the capacitance change information of a plurality of capacitance sensors obtained by detection of the touch display device with the prestored capacitance change information, so that pressure information of the touch display device is judged. Wherein the pressure information includes the magnitude of the force of the touch and may also include the location of the touch force.
In specific capacitive detection, similar to capacitive touch screen technology, the method can be divided into self-capacitance and mutual-capacitance methods. In the self-capacitance method, the electrode in the upper conductive electrode layer or the lower conductive electrode layer is grounded, and the touch display device directly detects the capacitance between the electrode of the non-grounded conductive electrode layer and the electrode of the grounded conductive electrode layer when the touch pressing pressure is detected. In addition, this type of method can be further extended to a "self-contained method", i.e. the electrode of the conductive electrode layer that is the same as the touch display device described above is not necessarily grounded, but may be at some other fixed potential. At this time, the capacitance directly detected by the touch display device is the capacitance of a plurality of capacitance sensors formed by the upper conductive electrode and the lower conductive electrode. In the self-contained method or "self-contained-like method", the upper conductive electrode layer may be driven by a single-ended induction method.
In the mutual capacitance detection method, the touch display device may sense a signal by driving an electrode of the upper conductive electrode layer and by an electrode of the lower conductive electrode layer, or the touch display device may sense a signal by driving an electrode of the lower conductive electrode layer and by an electrode of the upper conductive electrode layer. In this type of method, the capacitance directly detected by the touch display device is the capacitance of a plurality of capacitance sensors formed by the upper conductive electrode and the lower conductive electrode. Further, in the mutual capacitance detection method, the touch display device may sequentially perform sensing signals by driving one electrode of the upper conductive electrode layer and by driving other electrodes beside the electrode of the upper conductive electrode layer, and the electrode of the lower conductive electrode layer is only used as a reference electrode. At this time, the capacitance directly detected by the touch display device is a capacitance signal of the driving electrode and the sensing electrode of the upper conductive electrode layer, but the capacitance signal indirectly represents capacitance information between the electrode of the upper conductive electrode layer and the electrode of the lower conductive electrode layer. When the touch display device is pressed by touch, capacitance information between the electrodes of the upper conductive electrode layer and the electrodes of the lower conductive electrode layer is changed, and capacitance between the driving electrode and the sensing electrode in the upper conductive electrode layer detected by the touch display device is changed at the same time. In the foregoing mutual capacitance detection, the upper conductive electrode layer may be replaced by the lower conductive electrode layer, that is, the electrode of the lower conductive electrode layer is used as the driving electrode and the sensing electrode, and the electrode of the upper conductive electrode layer is used as the reference electrode of the lower conductive electrode layer.
The elastic layer includes a base and a deformable material layer carried by the base. The substrate may be constituted by a separate transparent plate body, such as a glass plate, a PET plate, a PC plate. In some embodiments, the substrate may also be used as a base by other structures within the touch display device according to the specific arrangement position of the pressure sensing unit, for example, when the elastic layer is located between the protective cover plate and the display unit, the upper polarizer of the liquid crystal functional layer in the display unit may be used as the substrate.
The deformation material layer can be a silica gel layer, a rubber layer, an acrylic acid series rubber layer and a sol layer. The basic structure of the deformation material layer can be columnar, cone, truncated cone, hemispheroid or irregular block, etc. The deformable material layer may also be made of porous material, such as foam layer, porous plastic layer, porous polyester layer, porous polypropylene layer, foam adhesive layer, etc.
The deformation material layer has macroscopic optical transparent property, and can transmit light in the light display unit, so as to not hinder the content display of the touch display device. When the deformable material layer is made of silica gel, rubber, acrylic rubber, sol, or the like, the deformable material layer may have an array-like dot-like or linear structure, or may have a full-face structure. When the deformable material layer is composed of a non-transparent or translucent material, it then assumes a dot-like, line-like configuration and the dimension of the dot-like configuration or the width of the line-like configuration is between 10 and 150 micrometers and the height is between 1 and 100 micrometers.
Some embodiments of the invention will be further described below with reference to the accompanying drawings.
As shown in fig. 1, a touch display device provided in a first embodiment of the present invention includes a protective cover 10, a pressure sensing unit 20, a touch sensing unit (not shown), and a display unit 30. The touch sensing unit is integrally disposed with the display unit 30, for example, to form an on-cell structure or an in-cell structure.
The display unit 30 includes a liquid crystal functional layer 301, a backlight module 305, and an electrode 302. The electrode 302 may be a common electrode or a pixel electrode, or may be an associated electrode of a thin film transistor.
The pressure sensing unit 20 includes an upper conductive electrode layer 21, a lower conductive electrode layer 23, and an elastic layer 22 between the upper conductive electrode layer 21 and the lower conductive electrode layer 23. The upper conductive electrode layer 21 is disposed on the lower surface of the protective cover 10, that is, the first carrier of the upper conductive electrode layer 21 is served by the protective cover 10. The upper conductive electrode layer 21 may also be formed by a separate plate body as the first carrier, and then combined with the protective cover 10. The lower conductive electrode layer 23 is common to the electrodes 302 in the display unit 30. In other embodiments, the lower conductive electrode layer 23 may also be on the same substrate surface as the electrode 302 in the display unit 30.
The structure shown in fig. 1 may also represent another embodiment, that is, the touch sensing unit and the protective cover 10 form an OGS structure, and the upper conductive electrode layer 21 is shared with the electrodes in the touch sensing unit, or is located on the same substrate surface as the electrodes in the touch sensing unit, that is, the upper conductive electrode layer 21 and the electrodes in the touch sensing unit are both fabricated on the lower surface of the protective cover 10.
As shown in fig. 2, the touch display device provided in the second embodiment of the present invention includes a protective cover 10, a pressure sensing unit 20, a touch sensing unit (not shown), and a display unit 30. The touch sensing unit is integrally disposed with the display unit 30, for example, to form an on-cell structure or an in-cell structure.
The display unit 30 includes a liquid crystal functional layer 301 and a backlight module 305, the upper surface of the liquid crystal functional layer 301 is provided with a common electrode 303, and the lower surface is provided with a thin film transistor 304, and the display unit 30 is a TN structure known in the industry.
The pressure sensing unit 20 includes an upper conductive electrode layer 21, a lower conductive electrode layer 23, and an elastic layer 22 between the upper conductive electrode layer 21 and the lower conductive electrode layer 23. The upper conductive electrode layer 21 is disposed on the lower surface of the protective cover 10, that is, the first carrier of the upper conductive electrode layer 21 is served by the protective cover 10. The upper conductive electrode layer 21 may also be formed by a separate plate body as the first carrier, and then combined with the protective cover 10. The lower conductive electrode layer 23 is shared with the common electrode 303 in the display unit 30. In other embodiments, the lower conductive electrode layer 23 may also be on the same substrate surface as the common electrode 303 in the display unit 30.
As shown in fig. 3, the touch display device provided in the third embodiment of the present invention includes a protective cover 10, a pressure sensing unit 20, a display unit 30, and a touch sensing unit 40. Wherein the touch sensing unit 40 is located between the protective cover 10 and the display unit 30.
The display unit 30 includes a liquid crystal functional layer 301, a backlight module 305, and an electrode 302. The electrode 302 may be a common electrode or a pixel electrode, or may be an associated electrode of a thin film transistor.
The pressure sensing unit 20 includes an upper conductive electrode layer 21, a lower conductive electrode layer 23, and an elastic layer 22 between the upper conductive electrode layer 21 and the lower conductive electrode layer 23. The upper conductive electrode layer 21 is disposed between the protective cover 10 and the touch sensing unit 40. The upper conductive electrode layer 21 may be disposed on the lower surface of the protective cover 10, that is, the first carrier of the upper conductive electrode layer 21 is served by the protective cover 10. The upper conductive electrode layer 21 may also be formed by a separate plate body as the first carrier, and then combined with the protective cover 10. The elastic layer 22 is located between the touch sensing unit 40 and the display unit 30. The lower conductive electrode layer 23 is common to the electrodes 302 in the display unit 30. In other embodiments, the lower conductive electrode layer 23 may also be on the same substrate surface as the electrode 302 in the display unit 30.
As shown in fig. 4, the touch display device according to the fourth embodiment of the present invention has substantially the same structure as that shown in fig. 3, except that the positions of the touch sensing unit 40 and the upper conductive electrode layer 21 in the pressure sensing unit 20 are interchanged, and the touch sensing unit 40 is located between the protective cover 10 and the upper conductive electrode layer 21.
As shown in fig. 5, a touch display device provided in a fifth embodiment of the present invention includes a protective cover 10, a pressure sensing unit 20, a touch sensing unit (not shown), and a display unit 30. The touch sensing unit is integrally disposed with the display unit 30, for example, to form an on-cell structure or an in-cell structure.
The display unit 30 includes a liquid crystal functional layer 301, a backlight module 305, and an electrode 302. The electrode 302 may be a common electrode or a pixel electrode, or may be an associated electrode of a thin film transistor.
The pressure sensing unit 20 includes an upper conductive electrode layer 21, a lower conductive electrode layer 23, and an elastic layer 22 between the upper conductive electrode layer 21 and the lower conductive electrode layer 23. The upper conductive electrode layer 21 is common to the electrodes 302 in the display unit 30. In other embodiments, the upper conductive electrode layer 21 may also be on the same substrate surface as the electrode 302 in the display unit 30. The lower conductive electrode layer 23 is disposed on a separate second carrier 230. The second carrier 230 is combined with the backlight module 305.
As shown in fig. 6, a touch display device provided in a sixth embodiment of the present invention includes a protective cover 10, a pressure sensing unit 20, a touch sensing unit (not shown), and a display unit 30. The touch sensing unit is integrally disposed with the display unit 30, for example, to form an on-cell structure or an in-cell structure.
The display unit 30 includes a liquid crystal functional layer 301 and a backlight module 305, the upper surface of the liquid crystal functional layer 301 is provided with a common electrode 303, and the display unit 30 forms a TN structure known in the industry.
The pressure sensing unit 20 includes an upper conductive electrode layer 21, a lower conductive electrode layer 23, and an elastic layer 22 between the upper conductive electrode layer 21 and the lower conductive electrode layer 23.
The upper conductive electrode layer 21 is shared with the common electrode 303 in the display unit 30. In another embodiment, the upper conductive electrode layer 21 may also be located on the same substrate surface as the common electrode 303 in the display unit 30.
The elastic layer 22 and the lower conductive electrode layer 23 are disposed between the liquid crystal functional layer 301 and the backlight module 305. The lower conductive electrode layer 23 is disposed on a separate second carrier 230. The second carrier 230 is combined with the backlight module 305.
As shown in fig. 7, the touch display device provided in the seventh embodiment of the present invention includes a protective cover 10, a pressure sensing unit 20, a display unit 30, and a touch sensing unit 40. Wherein the touch sensing unit 40 is located between the protective cover 10 and the display unit 30.
The pressure sensing unit 20 includes an upper conductive electrode layer 21, a lower conductive electrode layer 23, and an elastic layer 22 between the upper conductive electrode layer 21 and the lower conductive electrode layer 23. The upper conductive electrode layer 21 is common to electrodes in the touch sensing unit 40. Or in another embodiment, the upper conductive electrode layer 21 is located on the same substrate surface as the electrodes in the touch sensing unit 40.
The elastic layer 22 and the lower conductive electrode layer 23 are disposed between the touch sensing unit 40 and the display unit 30. The lower conductive electrode layer 23 is disposed on a separate second carrier 230. The second carrier 230 is combined with the backlight module 305 through the optical adhesive layer 301.
As shown in fig. 8, the touch display device provided in the eighth embodiment of the present invention includes a protective cover 10, a pressure sensing unit 20, a display unit 30, and a touch sensing unit 40. Wherein the touch sensing unit 40 is located between the protective cover 10 and the display unit 30.
The pressure sensing unit 20 includes an upper conductive electrode layer 21, a lower conductive electrode layer 23, and an elastic layer 22 between the upper conductive electrode layer 21 and the lower conductive electrode layer 23.
The upper conductive electrode layer 21 and the elastic layer 22 are located between the protective cover 10 and the touch sensing unit 40. The upper conductive electrode layer 21 has a separate first carrier 210, and the upper conductive electrode layer 21 is disposed on the first carrier 210 and then combined with the protective cover 10.
The lower conductive electrode layer 23 is common to electrodes in the touch sensing unit 40. Or in another embodiment, the lower conductive electrode layer 23 is located on the same substrate surface as the electrodes in the touch sensing unit 40.
The touch sensing unit 40 is combined with the display unit 30 by, for example, an optical adhesive layer.
As shown in fig. 9, a touch display device provided in a ninth embodiment of the present invention includes a protective cover 10, a pressure sensing unit 20, a display unit 30, and a touch sensing unit 40. Wherein the touch sensing unit 40 is located between the protective cover 10 and the display unit 30.
The display unit 30 includes a liquid crystal functional layer 301, a backlight module 305, and an electrode 302. The electrode 302 may be a common electrode or a pixel electrode, or may be an associated electrode of a thin film transistor.
The pressure sensing unit 20 includes an upper conductive electrode layer 21, a lower conductive electrode layer 23, and an elastic layer 22 between the upper conductive electrode layer 21 and the lower conductive electrode layer 23.
The upper conductive electrode layer 21 is common to electrodes in the touch sensing unit 40. In other embodiments, the upper conductive electrode layer 21 may also be on the same substrate surface as the electrodes in the touch sensing unit 40.
The lower conductive electrode layer 23 is common to the electrodes 302 in the display unit 30. In other embodiments, the lower conductive electrode layer 23 may also be on the same substrate surface as the electrode 302 in the display unit 30.
The elastic layer 22 is disposed between the touch sensing unit 40 and the liquid crystal functional layer 301 of the display unit 30.
In the above embodiments, when the upper conductive electrode layer and the electrode of the touch sensing unit are located on the same substrate surface, the upper conductive electrode layer and the electrode of the touch sensing unit are separated by a grounded wire, so as to reduce the influence of the electrode of the touch sensing unit on the detection function of the pressure input signal.
The drawings in the above embodiments show only exemplary structures, and structures such as bonding layers between functional layers are not all shown, and are known to those skilled in the art. In the same manner, unless otherwise specified, other structures not specifically described may be employed as is well known in the art.
Fig. 10 and 11 are schematic electrode diagrams of conductive electrode layers of capacitive sensors forming a detection force in the touch display device, taking fig. 10 as an example of an upper conductive electrode layer, the upper conductive electrode layer includes a plurality of strip-shaped conductive electrodes 211, and the conductive electrodes 211 are formed on a first carrier 210. Taking fig. 11 as an example of the lower conductive electrode layer, the lower conductive electrode layer includes a plurality of strip-shaped conductive electrodes 231, and the conductive electrodes 231 are formed on the second carrier 230. The conductive electrodes 211, 231 are arranged perpendicular to each other, and the projection in the horizontal two-dimensional plane has a crossing area of a certain area, thereby forming several capacitive sensors for detecting force. The detection of the capacitance value of the formed capacitive sensor is the same as the test mode of the existing capacitive touch screen.
The conductive electrode may also be of other shapes, as shown in fig. 12, the conductive electrode 211 being represented by a chain with a plurality of electrode blocks connected thereto. The electrode blocks are distributed in an array, and the shape of the electrode blocks can be square, prismatic, round or other irregular blocks.
The conductive electrode layer of the capacitive sensor for detecting force can be manufactured on a transparent substrate in a sputtering, vapor deposition, printing and other modes, such as PET, PC, glass and other transparent film materials. The electrode pattern of the conductive electrode layer may be obtained by ITO film etching, silk screen printing of conductive paste on PET, or a process using a metal-mesh (metal-mesh).
In addition, according to the above embodiments, the conductive electrode layer of the capacitive sensor for detecting force may be directly formed on the substrate where the electrode of the display unit or the touch sensing unit is located.
The invention acquires the pressure signal of touch operation by monitoring the capacitance, forms the capacitance sensor for sensing the pressure signal, can detect the multi-point touch pressure signal at the same time, and introduces the elastic layer between the two conductive electrode layers forming the capacitance sensor, and can easily generate elastic deformation under the stress by using the elastic layer, so that the capacitance sensor for detecting the force can generate sensitive capacitance change corresponding to the touch pressure, and finally realizes the sensitive detection of the touch pressure.
And the conductive electrode layer forming the capacitance sensor is shared with the electrode in the touch sensing unit or the display unit or is positioned on the surface of the same substrate, so that the thickness of the whole touch display device can be thinned, and meanwhile, the production and assembly flow of the touch display device can be shortened.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (5)
1. The touch display device comprises a protective cover plate, a touch sensing unit and a display unit, wherein the touch sensing unit is used for sensing a touch signal applied to the protective cover plate, and is characterized by further comprising a pressure sensing unit used for sensing a pressure signal applied to the protective cover plate, the pressure sensing unit comprises an upper conductive electrode layer, a lower conductive electrode layer and an elastic layer, wherein the upper conductive electrode layer is positioned between the upper conductive electrode layer and the lower conductive electrode layer, and the upper conductive electrode layer is shared with at least one of the electrodes in the touch sensing unit and the display unit;
the electrodes of the touch sensing unit comprise touch driving electrodes and touch sensing electrodes, and the touch driving electrodes and the touch sensing electrodes are distributed on the same substrate or respectively distributed on two different substrates;
the touch sensing unit and the display unit are integrated;
the display unit comprises a liquid crystal functional layer and a backlight module, wherein the liquid crystal functional layer comprises a pixel electrode and a common electrode for driving the liquid crystal functional layer;
the display unit is a thin film transistor display unit, and the thin film transistor display unit comprises a grid driving array electrode, a source driving array electrode and a drain driving electrode, wherein the drain driving electrode is connected with the pixel electrode.
2. The touch display device according to claim 1, wherein the upper conductive electrode layer is shared with an electrode of a display unit;
the lower conductive electrode layer is positioned between the upper conductive electrode layer and the backlight module.
3. The touch display device of claim 1, wherein the upper conductive electrode layer is common to electrodes of the touch sensing unit;
the lower conductive electrode layer is positioned between the touch sensing unit and the display unit.
4. The touch display device of claim 1, wherein the upper conductive electrode layer is common to electrodes of the touch sensing unit;
the lower conductive electrode layer is shared with an electrode of the display unit.
5. The touch display device of any one of claims 1-4, wherein the capacitive sensor that detects force is a self-capacitance or a mutual-capacitance sensor.
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| CN201510907413.2A CN106855764B (en) | 2015-12-09 | 2015-12-09 | Touch display device |
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| CN108550589B (en) * | 2018-06-12 | 2020-12-01 | 上海大学 | Display panel and preparation method |
| CN109857278B (en) * | 2019-02-27 | 2020-06-16 | 武汉华星光电半导体显示技术有限公司 | Touch control device |
| CN110275577B (en) * | 2019-06-25 | 2022-04-12 | 京东方科技集团股份有限公司 | Ultrasonic module and display screen |
| WO2021092785A1 (en) * | 2019-11-13 | 2021-05-20 | 南昌欧菲显示科技有限公司 | Tactile feedback module, touch screen, keyboard, and electronic device |
| CN112803937A (en) * | 2020-12-25 | 2021-05-14 | 东风汽车集团有限公司 | Touch control switch and touch control method and device thereof |
| CN116847619A (en) * | 2022-03-25 | 2023-10-03 | 华为技术有限公司 | Display assembly and electronic equipment |
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