JP7157209B2 - Flexible touch sensor and flexible touch display module - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a flexible touch sensor, and more particularly to a flexible touch sensor with a noise shielding layer and a flexible touch display module integrated with the flexible touch sensor.

In recent years, touch panels have been widely used in portable electronic products such as mobile phones, notebook computers, satellite navigation systems, and digital audiovisual players as information communication channels between users and electronic devices. Based on the touch principle, touch panels can be divided into two types: resistive touch panels and capacitive touch panels. Generally, a resistive touch panel consists of two sets of transparent conductive films. Two sets of transparent conductive films are pressed to make them conductive, and the voltage change is measured to calculate the pressing position. A capacitive touch panel calculates a pressed position using a change in capacitance caused by electrostatic coupling between a transparent electrode and a user. With the development of the panel industry, capacitive touch panels are gradually replacing resistive touch panels.

As the demand for touch panels gradually increases, the development of flexible touch panels is being actively pursued. The touch positioning of flexible touch panels can be implemented based on the principle of capacitive touch panels. Generally speaking, the flexibility of a flexible touch panel is achieved by the selection of materials for each layer therein, the thickness of each layer therein, and the distance between each layer therein.

However, adjusting the above characteristics and parameters often affects the performance of the flexible touch panel. For this reason, how to maintain and improve the performance and reliability of flexible touch panels on the premise of good flexibility has become an important issue in related fields.

According to some embodiments of the present disclosure, a flexible touch sensor having a visible area and a trace area surrounding the visible area includes a substrate, a touch sensing layer, and a noise shielding layer. The substrate has a first surface and a second surface facing away from the first surface. A touch sensitive layer is disposed on the first surface of the substrate. A noise shielding layer is disposed on the second surface of the substrate. The noise shielding layer includes a matrix and a plurality of metal nanowires dispersed within the matrix.

In some embodiments of the present disclosure, the noise shielding layer has a thickness of 30 nm to 50 nm.

In some embodiments of the present disclosure, the thickness of the substrate is 5 μm to 30 μm.

In some embodiments of the present disclosure, the touch sensitive layer includes conductive electrode layers and traces. A conductive electrode layer is correspondingly disposed in the visible region and has a single-layer electrode structure. Traces are disposed in corresponding trace regions and electrically connected to the conductive electrode layers.

In some embodiments of the present disclosure, the touch sensitive layer includes a first conductive electrode layer, a second conductive electrode layer, and an insulating layer. A first conductive electrode layer is disposed in the corresponding visible region. A second conductive electrode layer is disposed over the corresponding visible region and the first surface of the substrate. An insulating layer is disposed between the first conductive electrode layer and the second conductive electrode layer. The first conductive electrode layer, the second conductive electrode layer and the insulating layer are disposed on the same side of the substrate.

In some embodiments of the present disclosure, the touch sensitive layer corresponds to the first surface and trace areas of the substrate that are electrically connected to the first and second conductive electrode layers. Further includes placed traces.

In some implementations of the present disclosure, the touch sensitive layer includes a first conductive electrode layer and a second conductive electrode layer. A first conductive electrode layer is disposed over the corresponding visible region and the first surface of the substrate. A second conductive electrode layer is disposed within the corresponding visible region, on the second surface of the substrate, and between the substrate and the noise shielding layer.

In some embodiments of the present disclosure, the touch sensitive layer further includes first traces and second traces. A first trace is disposed on the first surface and a trace area of the substrate electrically connected to the first conductive electrode layer. A second trace is disposed over the trace area and the second surface of the substrate and is electrically connected to the second conductive electrode layer.

In some embodiments of the present disclosure, the flexible touch sensor further includes a carrier. A noise shielding layer is disposed on the surface of the carrier, and the carrier or noise shielding layer is disposed on the second surface of the substrate via the adhesive layer.

In some embodiments of the present disclosure, the total lamination thickness of the carrier and noise shielding layers is between 5 μm and 10 μm.

In some embodiments of the present disclosure, the flexible touch sensor further includes a flexible circuit board electrically connected to the touch sensing layer and the noise shielding layer.

In some embodiments of the present disclosure, the flexible touch sensor further includes a conductive coil correspondingly positioned within the trace area and on the surface of the noise shielding layer. The conductive coil directly contacts the noise shielding layer and is electrically connected to the flexible printed circuit board.

According to some other embodiments of the present disclosure, a flexible touch display module includes a flexible display panel and any of the above flexible touch sensors disposed on the flexible display panel.

In some embodiments of the present disclosure, the flexible touch display module further includes a cover glass disposed over the flexible touch sensor, and the flexible touch sensor has a thickness of 50 μm to 125 μm.

In some embodiments of the present disclosure, the flexible touch display module further includes a polarizing layer disposed between the flexible display panel and the flexible touch sensor or between the flexible touch sensor and the cover glass.

In the foregoing embodiments of the present disclosure, the flexible touch sensor is designed to include a noise shielding layer, and the flexible touch display module is integrated with the flexible touch sensor such that the noise shielding layer is touch sensitive with the flexible display panel. placed between layers. Since the noise shielding layer includes a matrix and metal nanowires dispersed in the matrix, the noise shielding layer can be bent, and the electrical conductivity of the noise shielding layer is not affected after bending multiple times, and a good The noise shielding effect can be maintained to avoid noise interference between the flexible display panel and the touch sensing layer, and the sensing rate and touch response speed of the flexible touch sensor can be improved. Also, by providing the noise shielding layer, the thickness of each layer of the flexible touch display module can be reduced, and the flexibility and lightness of the flexible touch display module can be improved.

The present disclosure can be more fully understood by reading the following detailed description of embodiments with reference to the accompanying drawings.

FIG. 10 is a cross-sectional view illustrating a flexible touch display module according to some embodiments of the present disclosure; FIG. 10 is a cross-sectional view illustrating a flexible touch display module according to some embodiments of the present disclosure; FIG. 10 is a cross-sectional view illustrating a flexible touch display module according to some embodiments of the present disclosure; FIG. 10 is a cross-sectional view illustrating a flexible touch display module according to some embodiments of the present disclosure; FIG. 10 is a cross-sectional view showing a flexible touch display module according to some other embodiments of the present disclosure; FIG. 10 is a cross-sectional view showing a flexible touch display module according to some other embodiments of the present disclosure; FIG. 10 is a cross-sectional view showing a flexible touch display module according to some other embodiments of the present disclosure; FIG. 10 is a cross-sectional view showing a flexible touch display module according to some other embodiments of the present disclosure; FIG. 10 is a cross-sectional view showing a flexible touch display module according to some other embodiments of the present disclosure; FIG. 10 is a cross-sectional view showing a flexible touch display module according to some other embodiments of the present disclosure; FIG. 10 is a cross-sectional view showing a flexible touch display module according to some other embodiments of the present disclosure; FIG. 10 is a cross-sectional view showing a flexible touch display module according to some other embodiments of the present disclosure;

Reference will now be made in detail to the present embodiments of the disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.

Further, as shown in the figures, relative terms such as "bottom" or "bottom" and "top" or "top" are used herein to describe the relationship of one element to another. can do. It should be understood that relative terms are intended to include different orientations of the device other than that shown in the figures. For example, when the device in one figure is turned over, elements described as being on the "bottom" side of other elements are oriented on the "top" side of the other elements. Thus, the exemplary term "lower" may include orientations of "lower" and "upper," depending on the particular orientation of the drawing. Similarly, when the device in one figure is turned over, elements labeled "bottom" are oriented "top" with respect to other elements. Thus, the exemplary term "bottom" can include orientations of "above" and "below."

The present disclosure provides a flexible touch sensor with a noise shielding layer and a flexible touch display module integrated with the flexible touch sensor. Among these, the noise shielding layer can prevent noise interference between the flexible display panel and the touch sensing layer, thereby improving the sensing rate and touch response speed of the flexible touch display module.

1A-1D are cross-sectional views illustrating flexible touch display modules 100a-100d according to some embodiments of the present disclosure. It should be understood that some layers of the flexible touch display modules 100a-100d of FIGS. 1A-1D are shown separated from each other for clarity. However, the layers within flexible touch display modules 100a-100d may actually be closely stacked in direct or indirect contact with each other, and this is true for all subsequent figures. Referring first to FIG. 1A, a flexible touch display module 100a includes a flexible display panel 110, a touch sensing layer 120, a substrate 122, a noise shielding layer 130 and a cover glass 140. Layer 130 can be configured as a flexible touch sensor 190 that provides touch sensing functionality.

In some embodiments, the flexible touch sensor 190 has a visible area VA and a trace area TA surrounding the visible area VA (eg, horizontally surrounding the visible area VA). Substrate 122 has a first surface 121 and a second surface 123 facing away from first surface 121 . Touch sensitive layer 120 is disposed on first surface 121 of substrate 122 . A noise shielding layer 130 is disposed on the second surface 123 of the substrate 122 , the noise shielding layer 130 comprises a matrix 132 and a plurality of metal nanowires (also called metal nanostructures) 134 distributed within the matrix 132 . can include In some embodiments, matrix 132 may comprise a polymer or mixture thereof, thereby imparting specific chemical, mechanical, and optical properties to metal nanowires 134 . For example, matrix 132 can provide good adhesion between metal nanowires 134 and substrate 122 . As another example, matrix 132 can use metal nanowires 134 with good mechanical strength. In some embodiments, the matrix 132 includes a specific polymer such that the metal nanowires 134 have added wear resistance and surface protection, thereby increasing the surface strength of the noise shielding layer 130 . The particular polymer can be, for example, polyacrylates, epoxies, polyurethanes, poly(silicon acrylates), polysiloxanes, polysilanes, or combinations thereof. In some embodiments, matrix 132 further comprises a cross-linking agent, a polymerization inhibitor, a stabilizer (eg, including but not limited to an antioxidant or UV stabilizer), a surfactant, or combinations thereof. , thereby improving the anti-ultraviolet property of the noise shielding layer 130 and extending the life of the noise shielding layer 130 .

In some embodiments, metal nanowires 134 may include, but are not limited to, silver nanowires, gold nanowires, copper nanowires, nickel nanowires, or combinations thereof. Additionally, the term "metal nanowires 134" as used herein is a collective term that refers to a collection of metal wires including multiple metal elements, metal alloys, or metal compounds (including metal oxides). Additionally, the number of metal nanowires 134 included in the noise shielding layer 130 is not intended to limit the present disclosure. Since the metal nanowires 134 of the present invention have excellent light transmittance, the metal nanowires 134 can impart a good noise shielding effect to the noise shielding layer 130 without affecting its optical properties.

In some embodiments, the cross-sectional size (eg, cross-sectional diameter) of a single metal nanowire 134 can be less than 500 nm, preferably less than 100 nm, more preferably less than 50 nm. In some embodiments, metal nanowires 134 have a large aspect ratio (length:diameter). Specifically, the aspect ratio of metal nanowires 134 can be between 10 and 100,000. More specifically, the aspect ratio of the metal nanowires 134 may be greater than 10, preferably greater than 50, and more preferably greater than 100. Additionally, other terms such as silk, fiber, or tube (eg, carbon nanotube) have the cross-sectional dimensions and aspect ratios described above and are also included in the present disclosure.

In some embodiments, noise shielding layer 130 may be formed by dispersing a fluid containing metal nanowires 134 through coating, curing, and drying steps. In some embodiments, the dispersing fluid comprises a solvent, thereby uniformly dispersing the metal nanowires 134 therein. Specifically, the solvent is, for example, water, alcohols, ketones, ethers, hydrocarbons, aromatic solvents (benzene, toluene, xylene, etc.), or combinations thereof. In some embodiments, the dispersing fluid contains additives, surfactants, and/or additives to improve compatibility between the metal nanowires 134 and the solvent and improve stability of the metal nanowires 134 in the solvent. or may further comprise a binding agent. Specifically, additives, surfactants and/or binders are, for example, carboxymethylcellulose (CMC), hydroxyethylcellulose (HEC), hydroxypropylmethylcellulose (HPMC), fluorine-containing surfactants, sulfosuccinate sulfonates , sulfate, phosphate, disulfonate, or combinations thereof.

In some embodiments, the coating step can include processes such as, but not limited to, screen printing, nozzle coating, or roller coating. In some embodiments, a roll-to-roll process can be performed to uniformly coat the dispersion comprising metal nanowires 134 onto the second surface 123 of the continuously fed substrate 122 . In some embodiments, the curing and drying process can volatilize the solvent and randomly distribute the metal nanowires 134 on the second surface 123 of the substrate 122 . In a preferred embodiment, the metal nanowires 134 can be fixed on the second surface 123 of the substrate 122 without falling off, the metal nanowires 134 can contact each other to form a continuous current path, Thereby, a conductive network can be formed that provides a good noise shielding effect.

In some embodiments, an overcoat (OC) layer is further coated over the metal nanowires 134 fixed on the second surface 123 of the substrate 122 and cured to form a composite structure layer with the metal nanowires 134. can do. In other words, the cured overcoat layer is the matrix 132 of this disclosure and the composite structural layer is the noise shielding layer 130 of this disclosure. Specifically, the polymer or mixture thereof described above may be formed on the metal nanowires 134 by coating, then the polymer or mixture thereof is infiltrated between the metal nanowires 134 to form a filler, and then cured. may be combined to form matrix 132 . In this manner, metal nanowires 134 can be embedded in matrix 132 . In some embodiments, heating and baking may be performed so that an overcoat layer comprising the aforementioned polymers or mixtures thereof can be formed within matrix 132 . In some embodiments, the heating and baking temperature may be between 50°C and 150°C. It should be understood that the physical structure between substrate 122 and metal nanowires 134 is not intended to limit the present disclosure. In some embodiments, matrix 132 and metal nanowires 134 may be a two-layer stack. In other embodiments, matrix 132 and metal nanowires 134 may be mixed together to form a composite structural layer. In a preferred embodiment, metal nanowires 134 are embedded in matrix 132 to form a composite structural layer.

In some embodiments, metal nanowires 134 may further undergo post-treatments to increase their conductivity. Post-treatments include, but are not limited to, steps of heating, plasma application, corona discharge, ultraviolet application, ozone application, or pressurization. In some embodiments, one or more rollers may be utilized to apply pressure to metal nanowires 134 . In some embodiments, the applied pressure may be between 50 psi and 3400 psi. In some embodiments, the post-treatments of the heating step and the pressing step may be performed simultaneously on the metal nanowires 134 . In some embodiments, the temperature of one or more rollers may be heated between 70°C and 200°C. In a preferred embodiment, metal nanowires 134 may be exposed to a reducing agent for post-treatment. For example, if the metal nanowires 134 are silver nanowires, the metal nanowires 134 can be exposed to a silver reducing agent for post-treatment. In some embodiments, the silver reducing agent can include a borohydride such as sodium borohydride, a boron nitrogen compound such as dimethylamine borane (DMAB), or a gaseous reducing agent such as hydrogen. Additionally, in some embodiments, the exposure time may be between 10 seconds and 30 minutes.

In some implementations, the noise shielding layer 130 can cover the entire second surface 123 of the substrate 122 . That is, the vertical projection of the noise shielding layer 130 on the flexible display panel 110 can completely overlap the vertical projection of the touch sensitive layer 120 on the flexible display panel 110 . In some implementations, noise shielding layer 130 can be positioned to avoid other elements (such as an antenna, not shown) on second surface 123 of substrate 122 . In some embodiments, the thickness H3 of the noise shielding layer 130 may be between 30 nm and 50 nm to provide the flexible touch sensor 190 with good noise shielding effect, flexibility and brightness. Specifically, when the thickness H3 of the noise shielding layer 130 is less than 30 nm, the noise shielding effect of the noise shielding layer 130 may deteriorate. Further, when the thickness H3 of the noise shielding layer 130 exceeds 50 nm, the flexibility of the flexible touch sensor 190 as a whole is impaired, and the flexible touch display module 100a becomes difficult to bend or easily damaged while bending.

In some embodiments, flexible touch sensor 190 can employ, for example, capacitive touch sensing technology, where touch sensing layer 120 includes a conductive electrode layer 124 and a substrate 122 on first surface 121 of substrate 122 . A plurality of arranged traces 126 may be included. A conductive electrode layer 124 is positioned corresponding to the visible area VA, and a trace 126 is positioned corresponding to the trace area TA and electrically connected to the conductive electrode layer 124 . In some embodiments, the conductive electrode layer 124 can be designed, for example, as an electrode layer of a single-layer electrode structure or a bridge-type single-layer electrode structure. Furthermore, the material of the conductive electrode layer 124 may be, but is not limited to, nanometal, indium tin oxide (ITO), indium zinc oxide (IZO), antimony tin oxide (ATO), antimony zinc oxide (AZO), carbon It can include transparent conductive materials such as nanotubes, graphene, or other suitable transparent conductive materials.

In some embodiments, the flexible touch sensor 190 may further include a flexible circuit board 170 with the conductive electrode layer 124 electrically connected to the flexible circuit board 170 via traces 126 to external circuit elements. Further connections may be made, thereby transmitting the sensing signals of the touch sensitive layer 120 to an external integrated circuit for subsequent processing. On the other hand, the noise shielding layer 130 is electrically connected to the flexible circuit board 170 through the wiring L, and can emit noise signals through the flexible circuit board 170 and supply a stable ground signal. .

Note that in some embodiments, noise shielding layer 130 is formed directly on second surface 123 of substrate 122 . In some other embodiments, the flexible touch sensor 190 further includes a carrier (not shown) and the noise shielding layer 130 is first formed on the surface of the carrier and then the noise shielding layer 130 is formed. The carrier is further attached to the second surface 123 of the substrate 122 via an adhesive layer (not shown). In some embodiments, the carrier with the noise shielding layer 130 formed thereon can be attached to the second surface 123 of the substrate 122 via an adhesive layer from the surface of the carrier or the surface of the noise shielding layer 130 .

For the entire flexible touch display module 100a, the flexible touch sensor 190 is arranged on the flexible display panel 110, and the noise shielding layer 130 is arranged on the second surface 123 of the substrate 122 to face the flexible display panel 110. , the noise shielding layer 130 is between the flexible display panel 110 and the touch sensitive layer 120 . As a result, the noise shielding layer 130 can effectively avoid noise interference between the flexible display panel 110 and the touch sensing layer 120, improving the sensing rate and touch response speed of the flexible touch display module 100a. can be done. Also, the cover glass 140 is disposed on the flexible touch sensor 190 to protect the flexible touch sensor 190 and the flexible display panel 110 . In the whole lamination structure, the noise shielding layer 130 , the substrate 122 , the touch sensing layer 120 and the cover glass 140 are sequentially laminated on the flexible display panel 110 .

In some embodiments, flexible display panel 110 may be, for example, an organic light emitting diode (OLED) panel. In some implementations, the substrate 122 and the cover glass 140 can each comprise a pliable, flexible material, referred to in the industry as a material with a certain strength and a certain flexibility. For example, such materials include polyimide (PI), polycarbonate (PC), polyvinyl chloride (PVC), polystyrene (PS), polyether sulfide (PES), polyester (PE), polyamidoamine (PA), polybutene ( PB), polyethylene (PE), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyetheretherketone (PEEK), polyurethane (PU), polyetherimide (PEI), polytetra It may contain fluoroethylene (PTFE), acrylic, or combinations thereof. In some implementations, the thickness H2 of the substrate 122 may be between 5 μm and 30 μm and the thickness H4 of the cover glass 140 may be between 50 μm and 125 μm, resulting in a flexible A flexible touch display module 100a with good flexibility and light weight is provided. Specifically, when the thickness H2 of the substrate 122 is thicker than 30 μm, the flexibility of the substrate 122 is affected, and when the thickness H4 of the cover glass 140 is thicker than 125 μm, the flexibility of the cover glass 140 is affected. , and the flexible touch display module 100a is less likely to flex or more likely to break while flexing.

In some embodiments, the flexible touch display module 100a may further include a polarizing layer 150, specifically a liquid crystal coated polarizing layer, for example. A polarizing layer 150 can be placed between the flexible touch sensor 190 and the cover glass 140 . In some embodiments, polarizing layer 150 can be formed directly on the surface of cover glass 140 . That is, the polarizing layer 150 is formed using the cover glass 140 as a substrate. In some embodiments, the flexible touch display module 100a may further include multiple adhesive layers 160 that are flexible. Specifically, the adhesive layer 160 is disposed between the polarizing layer 150 and the cover glass 140, between the flexible touch sensor 190 and the polarizing layer 150, and/or between the flexible display panel 110 and the flexible touch sensor 190. may be However, the present disclosure is not limited to this, and the adhesive layer 160 can be arranged between the layers according to actual needs. In some embodiments, the adhesive layer 160 can be, for example, an optically clear adhesive (OCA) with high light transmission, and the adhesive layer 160 can be a liquid optically clear adhesive (LOCA). It's okay. In some embodiments, the thickness H6 of the adhesive layer 160 is even between 5 μm and 100 μm, so as to provide good adhesive effect and the flexible touch display module 100a has good flexibility and light weight. good. Specifically, if the thickness H6 of the adhesive layer 160 is less than 5 μm, the adhesive effect may be weak and may not contribute to the adhesion between the layers in the flexible touch display module 100a. In addition, if the thickness H6 of the adhesive layer 160 exceeds 100 μm, the flexibility of the adhesive layer 160 is impaired, making it difficult to bend the flexible touch display module 100a, or resulting in poor appearance after repeated bending. There is a risk. In a preferred embodiment, the thickness H6 of the adhesive layer 160 may be between 5 μm and 25 μm to better have the above advantages.

Please refer to FIG. 1B next. At least one difference between flexible touch display module 100b shown in FIG. 1B and flexible touch display module 100a shown in FIG. is to further include Conductive coil 136 is disposed on surface 131 of noise shielding layer 130 facing away from substrate 122 and in direct contact with noise shielding layer 130 . In addition, the conductive coil 136 is further electrically connected to the flexible circuit board 170 via the wiring L and grounded. In some embodiments, conductive coil 136 may be made of a metallic material that has better electrical conductivity than noise shielding layer 130, including, for example, silver, copper, gold, aluminum, or combinations thereof. but not limited to these. By configuring in this way, the electrostatic discharge protection effect of the noise shielding layer 130 can be improved, and a more stable noise shielding effect can be obtained.

Now refer to FIG. 1C. At least one difference between flexible touch display module 100c shown in FIG. 1C and flexible touch display module 100a shown in FIG. ) and the polarizing layer 150 in the flexible touch display module 100c are in different relative positions. Specifically, in the flexible touch display module 100 c , the polarizing layer 150 is arranged between the flexible touch sensor 190 and the flexible display panel 110 . Additionally, a noise shielding layer 130 is disposed on the second surface 123 of the substrate 122 and faces the polarizing layer 150 , with the noise shielding layer 130 disposed between the polarizing layer 150 and the touch sensitive layer 120 . This can further increase the distance between the flexible touch sensor 190 and the flexible display panel 110, reduce the noise interference between the touch sensing layer 120 and the flexible display panel 110, and increase the flexibility of the flexible touch display module 100c. Sensing rate and touch response speed can be further improved.

See FIG. 1D. At least one difference between the flexible touch display module 100d shown in FIG. 1D and the flexible touch display module 100c shown in FIG. 136 is further included. Conductive coil 136 is disposed on surface 131 of noise shielding layer 130 facing away from substrate 122 and in direct contact with noise shielding layer 130 . In addition, the conductive coil 136 is further electrically connected to the flexible circuit board 170 via the wiring L and grounded. By configuring in this way, the electrostatic discharge protection effect of the noise shielding layer 130 can be improved, and a more stable noise shielding effect can be obtained.

2A-2D are cross-sectional views illustrating flexible touch display modules 200a-200d according to some other embodiments of the present disclosure. The flexible touch display modules 200a-200d of FIGS. 2A-2D have substantially the same structure as the flexible touch display modules 100a-100d of FIGS. 1A-1D. At least one difference is that the touch sensing layers 220 in the flexible touch display modules 200a-200d are each designed as a double layer electrode structure, which will be described later. First, referring to FIG. 2A, a flexible touch display module 200a includes a flexible display panel 210, a touch sensing layer 220, a substrate 222, a noise shielding layer 230 and a cover glass 240. The touch sensing layer 220, the substrate 222 and the noise The shield layer 230 can be configured as a flexible touch sensor 290 that provides touch sensing functionality. For the entire flexible touch display module 200a, the flexible touch sensor 290 is disposed on the flexible display panel 210, and the noise shielding layer 230 is disposed on the second surface 223 of the substrate 222 to face the flexible display panel 210. , the noise shielding layer 230 is disposed between the flexible display panel 210 and the touch sensitive layer 220 . Thus, the noise shielding layer 230 can avoid noise interference between the flexible display panel 210 and the touch sensing layer 220, thereby improving the sensing rate and touch response speed of the flexible touch display module 200a. be able to. Also, the cover glass 240 is disposed on the flexible touch sensor 290 to protect the flexible touch sensor 290 and the flexible display panel 210 . In the whole lamination structure, the noise shielding layer 230 , the substrate 222 , the touch sensing layer 220 and the cover glass 240 are sequentially laminated on the flexible display panel 210 . It should be appreciated that the flexible touch display module 200a of FIG. 2A and the flexible touch display module 100a of FIG. 1A have substantially identical component configurations/connections, materials, and advantages.

In some implementations, the touch sensing layer 220 of the dual layer electrode structure includes a first conductive electrode layer 224a, a second conductive electrode layer 224b, a plurality of traces 226 and the same side of the substrate 222 (e.g., substrate 222 can include an insulating layer 228 disposed on the side of the first surface 221). A second conductive electrode layer 224b is disposed on the first surface 221 of the substrate 222, and an insulating layer 228 is disposed on the surface of the second conductive electrode layer 224b and is disposed on the first conductive electrode layer. 224a is disposed on the surface of insulating layer 228 such that insulating layer 228 is disposed between first conductive electrode layer 224a and second conductive electrode layer 224b. That is, the first conductive electrode layer 224a and the second conductive electrode layer 224b are arranged corresponding to the visible area VA, and are arranged on the opposite surfaces of the insulating layer 228, respectively. Specifically, the second conductive electrode layer 224 b may be sandwiched between the substrate 222 and the insulating layer 228 . In some embodiments, the vertical projected area of insulating layer 228 on flexible display panel 210 may be smaller than the vertical projected area of substrate 222 on flexible display panel 210 .

In some embodiments, traces 226 are disposed within corresponding trace areas TA and on first surface 221 of substrate 222 facing cover glass 240 to form first conductive electrode layer 224a and second conductive electrode layer 224a. conductive electrode layer 224b may be electrically connected. In some implementations, the second conductive electrode layer 224b and the traces 226 are coplanar (eg, disposed in a plane formed by the X coordinate axis and the Y coordinate axis) and are electrically connected to each other. Connected, the first conductive electrode layer 224 a can be electrically connected to traces 226 further through conductive vias (not shown) in insulating layer 228 . In other embodiments, traces 226 may be formed as different layers. That is, the wiring L is disposed on the first surface 221 of the substrate 222 and electrically connected to the second conductive electrode layer 224b, and the insulating layer 228 forming the first conductive electrode layer 224a. may be disposed on the same plane as the first conductive electrode layer 224a and electrically connected to the first conductive electrode layer 224a.

In some implementations, the first conductive electrode layer 224a can be patterned into, for example, a plurality of first-axis (eg, X-axis direction, not shown) electrodes that are insulated from each other, and second conductive electrodes. Layer 224b may, for example, be patterned into a plurality of second-axis (eg, Y-axis direction, not shown) electrodes that are insulated from each other, wherein first conductive electrode layer 224a and second conductive electrode layer 224b are: They are electrically insulated from each other via the insulating layer 228 . In some embodiments, the flexible touch display module 200a further includes a flexible circuit board 270, wherein the first conductive electrode layer 224a and the second conductive electrode layer 224b are connected to the flexible circuit board 270 via traces 226. and to an external circuit element so that the sensing signal of the touch sensitive layer 220 can be transmitted to an external integrated circuit for subsequent processing. On the other hand, the noise shielding layer 230 is electrically connected to the flexible circuit board 270 through the wiring L, and can emit noise signals through the flexible circuit board 270 and supply a stable ground signal. .

Now refer to FIG. 2B. At least one difference between flexible touch display module 200b shown in FIG. 2B and flexible touch display module 200a shown in FIG. to further include; Conductive coil 236 is disposed on surface 231 of noise shielding layer 230 facing away from substrate 222 and is in direct contact with noise shielding layer 230 . In addition, the conductive coil 236 is further electrically connected to the flexible circuit board 270 via the wiring L and grounded. By configuring in this way, the electrostatic discharge protection effect of the noise shielding layer 230 can be improved, and a more stable noise shielding effect can be obtained.

Referring to FIG. 2C, at least one difference between the flexible touch display module 200c shown in FIG. 2C and the flexible touch display module 200a shown in FIG. , and the noise shielding layer 230) and the polarizing layer 250 in the flexible touch display module 200c are in different relative positions. Specifically, in the flexible touch display module 200 c , the polarizing layer 250 is arranged between the flexible touch sensor 290 and the flexible display panel 210 . Additionally, a noise shielding layer 230 is disposed on the second surface 223 of the substrate 222 , facing the polarizing layer 250 , with the noise shielding layer 230 disposed between the polarizing layer 250 and the touch sensitive layer 220 . This can further increase the distance between the flexible touch sensor 290 and the flexible display panel 210, reduce the noise interference between the touch sensing layer 220 and the flexible display panel 210, and reduce the noise interference between the flexible touch display module 200c. Sensing rate and touch response speed can be further improved.

See Figure 2D. At least one difference between flexible touch display module 200d shown in FIG. 2D and flexible touch display module 200c shown in FIG. is to further include Conductive coil 236 is disposed on surface 231 of noise shielding layer 230 facing away from substrate 222 and is in direct contact with noise shielding layer 230 . In addition, the conductive coil 236 is further electrically connected to the flexible circuit board 270 via the wiring L and grounded. By configuring in this way, the electrostatic discharge protection effect of the noise shielding layer 230 can be improved, and a more stable noise shielding effect can be obtained.

3A-3D are cross-sectional views illustrating flexible touch display modules 300a-300d according to some other embodiments of the present disclosure. The flexible touch display modules 300a-300d of FIGS. 3A-3D have substantially the same structure as the flexible touch display modules 100a-100d of FIGS. 1A-1D. At least one difference is that the touch sensing layer 320 of the dual-layer electrode structure and the substrate 322 in the flexible touch display modules 300a-300d are in different relative positions, which will be described later. Referring first to FIG. A3, a flexible touch display module 300a includes a flexible display panel 310, a touch sensing layer 320, a substrate 322, a noise shielding layer 330 and a cover glass 340. Layer 330 can be configured as a flexible touch sensor 390 that provides touch sensing functionality. The flexible touch display module 300 a as a whole comprises a flexible touch sensor 390 disposed on the flexible display panel 310 and a noise shielding layer 330 disposed between the flexible display panel 310 and the touch sensitive layer 320 . Thus, the noise shielding layer 330 can avoid noise interference between the flexible display panel 310 and the touch sensing layer 320, thereby improving the sensing rate and touch response speed of the flexible touch display module 300a. be able to. Also, the cover glass 340 is disposed on the flexible touch sensor 390 to protect the flexible touch sensor 390 and the flexible display panel 310 . It should be appreciated that flexible touch display module 300a of FIG. 3A and flexible touch display module 200a of FIG. 2A have substantially identical component configurations/connections, materials, and advantages.

In some implementations, the touch-sensing layer 320 of the dual-layer electrode structure is disposed on both sides of the substrate 322 (e.g., on the side of the first surface 321 and the side of the second surface 323 of the substrate 322). conductive electrode layer 324a and second conductive electrode layer 324b. A first conductive electrode layer 324a is disposed within a corresponding visible area VA and on the first surface 321 of the substrate 322, and a second conductive electrode layer 324b is disposed within a corresponding visible area VA and on the first surface 321 of the substrate 322. It is disposed on the second surface 323 and between the substrate 322 and the noise shielding layer 330 . The touch sensitive layer 320 further includes a first trace 236a and a second trace 326b, the first trace 236a being disposed on the first surface 321 of the substrate 322 facing the corresponding trace area TA and the cover glass 340. and electrically connected to the first conductive electrode layer 324a, and the second traces 236b are disposed on the second surface 323 of the substrate 322 facing the corresponding trace areas TA and the flexible display panel 310 to form the second traces 236b. 2 conductive electrode layers 324b.

It should be noted that the flexible touch sensor 390 of the present embodiment supports the noise shielding layer 330 based on the relative positions of the first conductive electrode layer 324a, the second conductive electrode layer 324b, the substrate 322 and the noise shielding layer 330. It may further comprise a carrier 380 for carrying. Specifically, first, after the noise shielding layer 330 is formed on the surface of the carrier 380, the carrier 380 on which the noise shielding layer 330 is formed is coated with the first conductive electrode layer 3424a and the second conductive electrode layer 324b. is further attached to the substrate 322 on which is formed. Actually, the carrier 380 on which the noise shielding layer 330 is formed is separated from the surface of the carrier 380 or the surface of the noise shielding layer 330 via the adhesive layer 360 to form the first conductive electrode layer 324a and the second conductive electrode layer 324b. can be attached to the substrate 322 on which is formed. In this way, the noise shielding layer 330 is electrically insulated from the second conductive electrode layer 324b at least via the adhesive layer 360, and is further electrically isolated from the second conductive electrode layer 324b via the adhesive layer 360 and the carrier 380. and electrically isolated. In some embodiments, the total lamination thickness H7 of the carrier 380 and the noise shielding layer 330 can be between 5 μm and 10 μm, which affects the flexibility and brightness of the flexible touch display module 300a. Therefore, the flexible touch display module 300a having a noise shielding function can be realized. Specifically, when the total lamination thickness H7 of the carrier 380 and the noise shielding layer 330 exceeds 10 μm, the flexibility of the flexible touch sensor 390 is impaired, making it difficult for the flexible touch display module 300a to bend when bent. , break easily.

In some embodiments, the flexible touch display module 300a further includes a flexible circuit board 370, wherein the first conductive electrode layer 324a and the second conductive electrode layer 324b are respectively connected to the first trace 326a and the second conductive electrode layer 326a. 2 traces 326b to the flexible circuit board 370 for further connection to external circuit elements, thereby transmitting the sensing signals of the touch sensitive layer 320 to an external integrated circuit for subsequent processing. can do. On the other hand, the noise shielding layer 330 is electrically connected to the flexible circuit board 370 through the wiring L, and can also vent noise signals through the flexible circuit board 370 and supply a stable ground signal. .

Although not shown in the drawings, it should be understood in the flexible touch display modules 100a-100d and 200a-200d of the previous figures. Also, the noise shielding layer 330 can be arranged and fixed using the carrier 380 and the adhesive layer 360, and a good noise shielding effect can be obtained. In addition, by using the carrier 380 and the adhesive layer 360 to fix the noise shielding layer 330, the distance between the touch sensing layer 320 and the flexible display panel 310 can be further increased. By reducing noise interference with the flexible display panel 310, the sensing rate and touch response speed of the flexible touch display module 300a can be improved.

Now refer to FIG. 3B. At least one difference between flexible touch display module 300b shown in FIG. 3B and flexible touch display module 300a shown in FIG. and wherein the conductive coil 336 is disposed on the surface of the noise shielding layer 330 facing away from the carrier 380 and in direct contact with the noise shielding layer 330 . In addition, the conductive coil 336 is further electrically connected to the flexible circuit board 370 via the wiring L and grounded. By configuring in this way, the electrostatic discharge protection effect of the noise shielding layer 330 can be improved, and a more stable noise shielding effect can be obtained.

Referring to FIG. 3C, at least one difference between the flexible touch display module 300c shown in FIG. 3C and the flexible touch display module 300a shown in FIG. , and the noise shielding layer 330) and the polarizing layer 350 in the flexible touch display module 300c are in different relative positions. Specifically, in the flexible touch display module 300c, the polarizing layer 350 is arranged between the flexible touch sensor 390 and the flexible display panel 310, and the noise shielding layer 230 is arranged between the polarizing layer 350 and the touch sensing layer 320. It is This can further increase the distance between the flexible touch sensor 390 and the flexible display panel 310, reduce the noise interference between the touch sensing layer 320 and the flexible display panel 310, and increase the flexibility of the flexible touch display module 300c. Sensing rate and touch response speed can be further improved.

See Figure 3D. At least one difference between flexible touch display module 300d shown in FIG. 3D and flexible touch display module 300c shown in FIG. is to further include Conductive coil 336 is disposed on the surface of noise shielding layer 330 facing away from carrier 380 and is in direct contact with noise shielding layer 330 . In addition, the conductive coil 336 is further electrically connected to the flexible circuit board 370 via the wiring L and grounded. By configuring in this way, the electrostatic discharge protection effect of the noise shielding layer 330 can be improved, and a more stable noise shielding effect can be obtained.

According to the above-described embodiments of the present invention, the flexible touch sensor is designed to have a noise shielding layer, the flexible touch display module is integrated with the flexible touch sensor, and the noise shielding layer is integrated with the flexible display panel. It is arranged between the flexible touch sensor. Since the noise shielding layer includes a matrix and metal nanowires dispersed in the matrix, the noise shielding layer can be bent, and the electrical conductivity of the noise shielding layer is not affected after bending multiple times, and a good The noise shielding effect can be maintained to avoid noise interference between the flexible display panel and the touch sensing layer, and the sensing rate and touch response speed of the flexible touch sensor can be improved. Also, by providing the noise shielding layer, the thickness of each layer of the flexible touch display module can be reduced, and the flexibility and lightness of the flexible touch display module can be improved.

Although the present disclosure has been described in considerable detail with reference to specific embodiments thereof, other embodiments are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.

It will be apparent to those skilled in the art that various modifications and variations can be made to the structures of the disclosure without departing from the scope or spirit of the disclosure. In view of the above, it is intended that the present disclosure include modifications and variations of the present disclosure as long as they come within the scope of the following claims.

100a-100d flexible touch display module 200a-200d flexible touch display module 300a-300d flexible touch display module 110,210,310 flexible display panel 120,220,320 touch sensitive layer 121,221 first surface 122,222,322 substrate 123,223 second surface 124 conductive electrode layer 126,226 trace 130,230,330 noise shielding layer 132 matrix 134 metal nanowires 136,236,336 conductive coil 140,240,340 cover glass 150,250,350 polarization Layers 160, 360 Adhesive Layer 170, 270, 370 Flexible Circuit Board 190, 290, 390 Flexible Touch Sensor 228 Insulating Layer 380 Carrier VA Visible Area TA Trace Area

Claims (11)

A flexible touch sensor having a visible area and a trace area surrounding the visible area,
a substrate having a first surface and a second surface facing away from the first surface;
a touch sensitive layer disposed on the first surface of the substrate;
a noise shielding layer disposed on the second surface of the substrate;
The noise shielding layer has a matrix and a plurality of metal nanowires dispersed in the matrix ,
The noise shielding layer further has a carrier,
arranged on the surface of the carrier, wherein the carrier or the noise shielding layer is arranged on the second surface of the substrate via an adhesive layer;
A flexible touch sensor , wherein a total lamination thickness of the carrier and the noise shielding layer is 5 μm to 10 μm . The flexible touch sensor according to claim 1, wherein the noise shielding layer has a thickness of 30nm to 50nm. The touch sensitive layer comprises:
a conductive electrode layer disposed in the corresponding visible region and having a single-layer electrode structure;
a trace disposed corresponding to the trace region and electrically connected to the conductive electrode layer;
The flexible touch sensor according to claim 1 or 2, further comprising: The touch sensitive layer comprises:
a first conductive electrode layer disposed in the corresponding visible region;
a second conductive electrode layer disposed on the corresponding visible region and the first surface of the substrate;
an insulating layer disposed between the first conductive electrode layer and the second conductive electrode layer;
3. The flexible touch sensor according to claim 1 or 2, wherein the first conductive electrode layer, the second conductive electrode layer and the insulating layer are arranged on the same side of the substrate. The touch sensing layer has traces disposed corresponding to the trace area and the first surface of the substrate electrically connected to the first conductive electrode layer and the second conductive electrode layer. 5. The flexible touch sensor of claim 4, further comprising: The touch sensitive layer comprises:
a first conductive electrode layer disposed on the corresponding visible region and the first surface of the substrate;
a second conductive electrode layer disposed within the corresponding visible region, on the second surface of the substrate, and between the substrate and the noise shielding layer;
The flexible touch sensor according to claim 1 or 2, comprising: The touch sensitive layer comprises:
a first trace disposed corresponding to the first surface of the substrate electrically connected to the trace region and the first conductive electrode layer;
a second trace disposed in correspondence with the trace region of the substrate and the second surface electrically connected to the second conductive electrode layer;
7. The flexible touch sensor of claim 6, further comprising: 8. The flexible touch sensor of any one of claims 1-7 , further comprising a flexible circuit board electrically connected to the touch sensitive layer and the noise shielding layer. further comprising a conductive coil correspondingly disposed within the trace area and on the surface of the noise shielding layer, the conductive coil directly contacting the noise shielding layer and electrically connecting to the flexible circuit board; 9. The flexible touch sensor of claim 8 , connected. A flexible touch display module comprising:
a flexible display panel;
The flexible touch sensor according to any one of claims 1 to 9 arranged on the flexible display panel;
A flexible touch display module with further comprising a cover glass provided on the flexible display panel;
11. The flexible touch display module of claim 10 , further comprising a polarizing layer disposed between the flexible display panel and the flexible touch sensor or between the flexible touch sensor and the cover glass.

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