Touch display module and preparation method thereof

Abstract

The invention provides a touch display module and a preparation method thereof. The touch display module comprises a touch module and a display module, the touch module is a multi-stage nano metal network touch module, and a touch function layer in the touch module is located on the upper surface or the lower surface of the rigid cover plate, the upper surface or the lower surface of the upper polaroid or the upper surface of the color filter. A touch function layer in the touch module comprises a first touch electrode, a second touch electrode and an insulating layer; wherein the first touch electrode comprises a first part and a second part of the first touch electrode; the second touch electrode comprises a first part and a second part of the second touch electrode; the combined light transmittance of the second part of the second touch electrode and the second part of the first touch electrode is equal to the light transmittance of the first part of the second touch electrode and the first part of the first touch electrode in the touch module. The liquid crystal display panel has the advantages of high sensitivity, high display brightness and low etching marks.

Description

Technical Field

[0001] The present invention relates to the field of touch display technology, and in particular to a touch display module and a preparation method thereof. Background Art

[0002] With the rapid development of flexible touch display technology, flat touch display screens provide users with better visual effects and tactile experience due to their seamless edges, high stiffness, scratch resistance, impact resistance and good optical properties. They are widely used in consumer electronics, commercial applications, medical and laboratory equipment, industrial automation, education and training and other industries.

[0003] Chinese patent application CN 118348718 A discloses an upper cover structure, in which an insulating guide layer is arranged around the color filter, and the insulating guide layer is located on the surface of the conductive medium layer, so that the color filter corresponds to the pixel electrode, thereby improving the display contrast. Although the additional insulating guide layer of silicon nitride reduces the oblique electric field problem in the prior art, it does not meet the actual requirements of high transparency, low fog, high sensitivity, etc. of touch display. Summary of the invention

[0004] The present application integrates the touch module with the display module, which has the advantages of being ultra-light, ultra-thin and cost-effective. The technical solution of the present invention provides a touch display module, which includes a rigid cover plate 10, a bonding adhesive 20, an upper polarizer 30, a color filter substrate 40, a liquid crystal layer 50, a thin film transistor substrate 60, a lower polarizer 70 and a backlight module 80, wherein the touch function layer of the touch module is located on one of the upper or lower surface of the rigid cover plate, the upper or lower surface of the upper polarizer, or the upper surface of the color filter.

[0005] The present application provides a touch display module, comprising a touch module and a display module; the touch module is a multi-level nano-metal network touch module, and the touch function layer in the touch module is located on the upper surface or lower surface of a rigid cover plate, the upper surface or lower surface of an upper polarizer, or the upper surface of a color filter;

[0006] The touch function layer in the touch module includes a first touch electrode, a second touch electrode and an insulating layer; wherein the first touch electrode includes a first part and a second part of the first touch electrode; the second touch electrode includes a first part and a second part of the second touch electrode;

[0007] The combined light transmittance of the second portion of the second touch electrode and the second portion of the first touch electrode is equal to the light transmittance of the first portion of the second touch electrode and the first portion of the first touch electrode in the touch module.

[0008] As an improvement of the above technical solution, the touch function layer adopts a jumper bridge design, which includes:

[0009] a first touch electrode;

[0010] Insulating layer: arranged on the upper layer of the second part of the first touch electrode, located between the second part of the first touch electrode and the second part of the second touch electrode, and used for electrically insulating the second part of the first touch electrode and the second part of the second touch electrode, that is, the aligned stacked structure from bottom to top includes: the second part of the first touch electrode, the insulating layer, and the second part of the second touch electrode; and

[0011] A second touch electrode, wherein the first portion of the second touch electrode is arranged in the same layer as the first portion of the first touch electrode and the second portion of the first touch electrode, the second portion of the second touch electrode is located above the insulating layer and is electrically insulated from the first touch electrode, and is used to connect the first portion of the second touch electrode to jointly form a second touch electrode as a whole.

[0012] As another improvement of the above technical solution, the first touch electrode of the touch module is arranged on the upper surface or the lower surface of the rigid cover plate, and one of the upper surface or the lower surface of the upper polarizer of the display module, and the first touch electrode adopts a multi-level nano-metal network; the second touch electrode is arranged on the upper surface of the color filter substrate of the display module, and the second touch electrode adopts a multi-level nano-metal network.

[0013] As an improvement of the above technical solution, when a touch function layer is provided on the upper surface of the rigid cover plate, the touch display module further comprises a cover plate located on the upper surface of the rigid cover plate and a bonding adhesive for bonding the cover plate.

[0014] As an improvement of the above technical solution, the projections of the second portion of the first touch electrode, the insulating layer, and the second portion of the second touch electrode aligned from bottom to top on the color filter are aligned with the black matrix area of ​​the color filter.

[0015] As an improvement of the above technical solution, the rigid cover plate includes: ordinary glass, special glass, tempered glass, acrylic, alloy plate, ceramic plate or composite material plate; a functional layer is also arranged on the surface of the rigid cover plate, and the functional layer includes a hardening layer, an anti-glare layer (AG layer), an anti-fingerprint layer (AF layer) or an anti-reflection layer (AR layer).

[0016] The present application also provides a method for preparing a touch display module, wherein the method adopts a jumper bridge design to prepare a touch function layer on the surface of a rigid cover plate, and the steps include:

[0017] 1) directly applying a layer of metal nanowire conductive liquid containing a functional resin solution on the surface of the rigid cover plate to form a metal nanowire conductive layer;

[0018] 2) preparing a protective layer on the surface of the metal nanowire conductive layer to form a metal nanowire conductive plate;

[0019] 3) etching the metal nanowire layer to form a first touch electrode and a first part of a second touch electrode of a multi-level nanometal network touch module;

[0020] 4) preparing an insulating layer on the upper side of the second part of the first touch electrode;

[0021] 5) A second part of the second touch electrode is prepared above the insulating layer and connected to the first part of the second touch electrode to form a second touch electrode.

[0022] As an improvement of the above technical solution, the functional resin solution includes a silane coupling agent, a phthalate coupling agent, an organic metal coupling agent and / or a zirconate coupling agent, and the addition amount of the functional resin solution is 0.01%-5%.

[0023] As an improvement of the above technical solution, the conductive liquid containing the functional resin solution or the functional resin solution is applied by spin coating, blade coating, slit coating, roller coating, micro-concave coating, spray coating, flow coating, inkjet printing or screen printing.

[0024] As an improvement of the above technical solution, the line width of the multi-level nanometal network is 3-50μm, the line spacing is 60-1000μm, and the duty cycle is 45%-96%; the width of the conductive channel between the first touch electrodes and the width of the conductive channel between the second touch electrodes are both 0.05-15mm, and there is an insulating area between two adjacent conductive channels, and the width of the insulating area is 0.1-10mm.

[0025] The upper touch electrode and the lower touch electrode may also be made of one or more combinations of metal nanowires, metal grids, ITO, metal nanowires, graphene, carbon nanotubes, carbon fibers and conductive polymers.

[0026] Compared with the prior art, the advantage of the present invention is that the touch display module of the present invention has a touch electrode of the touch module that can be arranged on the upper surface or lower surface of the rigid cover plate, the upper surface or lower surface of the upper polarizer, or on the upper surface of the color filter glass substrate, and adopts a jumper bridge structure design, so that the touch module can achieve the advantages of high definition, high sensitivity touch response, scratch resistance, easy cleaning, high transparency and light weight.

[0027] The touch display module of the present invention has the following advantages:

[0028] 1. The touch function layer in the touch module is located on the upper surface or lower surface of the rigid cover plate, the upper surface or lower surface of the upper polarizer, or the upper surface of the color filter. The touch function layer adopts a jumper bridge design to achieve the characteristics of ultra-light and ultra-thin touch display module.

[0029] 2. The projection of the second portion of the first touch electrode, the insulating layer, and the second portion of the second touch electrode on the color filter, which are aligned from bottom to top, are aligned with the black matrix area of ​​the color filter, thereby avoiding reflection and scattering of the light emitted by the color filter by the touch module, thereby improving the display clarity of the touch display module and reducing the visual etching marks of the touch display module.

[0030] 3. Integrate the touch electrode of the touch module into the display module, which is lightweight, simple to manufacture and low in cost.

[0031] 4. With a rigid cover, the touch surface is flat, the touch feel is more natural and smooth, and easy to clean.

[0032] 5. The touch electrode adopts a multi-level nano-metal network, which has the advantages of low resistance, high transmittance, low haze and high clarity. It has low reflection and low scattering of the output light of the display module, further improving the display clarity and color purity.

[0033] In summary, the touch display module of the present invention adopts a multi-level nano-metal network touch electrode, which has the advantages of low resistance, high transmittance, low haze, and high clarity. It has low reflection and low scattering of the output light of the display module, making the touch display module ultra-light and ultra-thin while having the advantages of high sensitivity, high display clarity and low etching marks. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The same reference numerals in the drawings represent the same or similar components. For ease of understanding, some components in the drawings are infinitely enlarged. The specific shapes in the drawings have nothing to do with the shape information of the actual components and are only for ease of identification and description. Obviously, those skilled in the art can obtain other drawings based on these drawings without any creative work.

[0035] Figure 1 A schematic diagram of the structure of a touch display module provided by an embodiment of the present invention;

[0036] Figure 2a This is a schematic diagram of the structure where the touch module is located on a rigid cover plate;

[0037] Figure 2b It is a schematic diagram of the structure in which the touch module is located on the upper polarizer;

[0038] Figure 2c It is a schematic diagram of the structure of the touch module located on the color filter glass substrate;

[0039] Figure 3 A schematic diagram of a first touch electrode first portion, a first touch electrode second portion, and a second touch electrode first portion located in the same layer;

[0040] Figure 4 The top view of the bridging jumper shows that the structure of the second part of the first touch electrode is stacked from bottom to top: the second part of the first touch electrode, the insulating layer, and the second part of the second touch electrode, wherein the second part of the first touch electrode and the second part of the second touch electrode are completely insulated from each other;

[0041] Figure 5a A cross-sectional side view of a jumper bridge structure in the direction of the first touch electrode;

[0042] Figure 5b A cross-sectional side view of a jumper bridge structure in the direction of the second touch electrode;

[0043] Figure 6 It is a schematic diagram of a first touch electrode first portion, a first touch electrode second portion and a second touch electrode first portion located on the same layer in a preferred embodiment of the present invention;

[0044] Figure 7 A top view of a jumper bridge according to a preferred embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram of the alignment of the second portion of the first touch electrode, the insulating layer, and the projection of the second portion of the second touch electrode on the color filter and the black matrix area of ​​the color filter, which are aligned from bottom to top in the touch display module of an embodiment of the present invention, taking the touch function layer being arranged on the color filter glass substrate as an example.

[0046] Figure ID

[0047] 10 is a cover plate, 20 is a bonding adhesive, and 30 is an upper polarizer.

[0048] 40 is a color filter substrate, 50 is a liquid crystal layer, and 60 is a thin film transistor substrate.

[0049] 70 is the lower polarizer and 80 is the backlight module

[0050] 101(301) Touch electrode

[0051] 41 is a touch function layer

[0052] 411 is a first touch electrode 4111 is a first portion of the first touch electrode 4112 is a second portion of the first touch electrode 412 is a second touch electrode 4121 is a first portion of the second touch electrode 4122 is a second portion of the second touch electrode 413 is an insulating layer

[0053] 42 is the filter layer

[0054] 421 is a black matrix and 422 is a red, green and blue pixel layer DETAILED DESCRIPTION

[0055] The following are examples of the present invention. It should be clear to those skilled in the art that the examples listed are only a part of the present invention and should not be regarded as specific limitations of the present invention.

[0056] Example 1

[0057] like Figure 1 As shown, it is a schematic diagram of the structure of the touch display module of the present invention, which includes, from top to bottom, a cover plate 10, a bonding adhesive 20, an upper polarizer 30, a color filter substrate 40, a liquid crystal layer 50, a thin film transistor substrate 60, a lower polarizer 70 and a backlight module 80.

[0058] The touch display module further includes a touch electrode located on the lower surface of the rigid cover plate 10, the upper surface of the upper polarizer 30 or the upper surface of the color filter substrate 40. The structural diagram thereof is shown in FIG. Figure 2a , 2b , and 2c, where Figure 2a It includes a rigid cover plate 10 and a touch electrode 101 disposed on the lower surface thereof. Figure 2b It includes an upper polarizer 30 and a touch electrode 301 disposed on its upper surface. Figure 2c From top to bottom, it includes a touch electrode 41, a color filter substrate 40 and a color filter layer 42. The touch function layer 41 is located on the side of the color filter substrate 40 opposite to the color filter layer.

[0059] The touch electrodes are arranged on the surface of the rigid cover plate or the upper polarizer or the color filter substrate, and the touch module is directly placed inside the display module, so as to achieve the purpose of ultra-light and ultra-thin touch display module. At the same time, the multi-level nano-metal network used in the touch electrode has the advantages of low resistance, high transmittance, low haze and high definition, and low reflection and low scattering of the outgoing light of the color filter, avoiding the visualized dot appearance of the touch module with traditional jumper bridge structure, so that the touch display module has the advantages of high sensitivity, high display clarity and low etching marks.

[0060] Example 2

[0061] like Figure 3As shown, it is a schematic diagram of the first touch electrode first part, the first touch electrode second part and the second touch electrode first part located in the same layer. It includes a first touch electrode 411, a first touch electrode first part 4111, a first touch electrode second part 4112, and a second touch electrode first part 4121. The first touch electrode first parts 4111 are arranged at intervals and connected through the first touch electrode second part 4112, and the first touch electrode first part 4111 and the first touch electrode second part 4112 together constitute the first touch electrode 411. The second touch electrode first parts 4121 are arranged at intervals in a direction perpendicular to the direction of the first touch electrode, that is, the second touch electrode first parts 4121 are arranged at intervals in the direction of the second touch electrode. Wherein, as Figure 3 As shown, an enlarged picture of the grid lines of a multi-level nanometal network, where the grid lines are made up of overlapping metal nanowires.

[0062] like Figure 4 As shown, it is a top view of the jumper wire, including a second touch electrode 412, a second touch electrode first part 4121, a second touch electrode second part 4122, and an insulating layer 413. The second touch electrode first part 4121 is arranged at intervals in the direction of the second touch electrode, and is connected through the second touch electrode second part 4122. The second touch electrode first part 4121 and the second touch electrode second part 4122 together constitute the second touch electrode 412. The second touch electrode second part 4122 is stacked on the first touch electrode second part and is completely insulated from the first touch electrode second part. The stacked structure is as follows from bottom to top: the first touch electrode second part ( Figure 4 The insulating layer 413 is completely covered by the second touch electrode portion 4122, wherein the first touch electrode portion 4122 is separated from the second touch electrode portion 412 by the insulating layer 413, thereby achieving an effect of complete insulation between the two.

[0063] Example 3

[0064] like Figure 5a , which is a cross-sectional side view of the jumper bridge structure in the direction of the first touch electrode, includes a first touch electrode 411, a first touch electrode first portion 4111, a first touch electrode second portion 4112, a second touch electrode second portion 4122, and an insulating layer 413. The second touch electrode first portion (not identifiable in this figure) is spaced perpendicular to the first touch electrode 411 and connected via the second touch electrode second portion 4122. Figure 5bIt is a cross-sectional side view of the structure of the jumper bridge in the direction of the second touch electrode, including the first touch electrode second part 4112, the second touch electrode 412, the second touch electrode first part 4121, the second touch electrode second part 4122, and the insulating layer 413. The first touch electrode first part (not identifiable in this figure) is arranged perpendicular to the second touch electrode 412 and is connected through the first touch electrode second part 4112.

[0065] Example 4

[0066] Figure 6 This is a schematic diagram of the first touch electrode first part, the first touch electrode second part and the second touch electrode first part located in the same layer, which are preferred in the present invention, including the first touch electrode 411, the first touch electrode first part 4111, the first touch electrode second part 4112, and the second touch electrode first part 4121. The first touch electrode first parts 4111 are arranged at intervals and connected through the first touch electrode second part 4112, and the first touch electrode first part 4111 and the first touch electrode second part 4112 together constitute the first touch electrode 411. The second touch electrode first parts 4121 are arranged at intervals in a direction perpendicular to the direction of the first touch electrode, that is, the second touch electrode first parts 4121 are arranged at intervals in the direction of the second touch electrode.

[0067] In this embodiment, the network line width of the second part 4112 of the first touch electrode of the multi-level nanometal network touch module is smaller than the network line width of the first part 4111 of the first touch electrode, and the transmittance of the second part 4112 of the first touch electrode is 1 / 2 of the transmittance of the first part 4111 of the first touch electrode.

[0068] Figure 7 The preferred jumper bridge top view of the present invention includes a second touch electrode 412, a second touch electrode first part 4121, a second touch electrode second part 4122, and an insulating layer 413. The second touch electrode first part 4121 is arranged at intervals in the direction of the second touch electrode and is connected through the second touch electrode second part 4122. The second touch electrode first part 4121 and the second touch electrode second part 4122 together constitute the second touch electrode 412. The second touch electrode second part 4122 is stacked on the first touch electrode second part and is completely insulated from the first touch electrode second part. The stacked structure is as follows from bottom to top: the first touch electrode second part ( Figure 7 The insulating layer 413 is completely covered by the second touch electrode portion 4122, wherein the first touch electrode portion 4122 is separated from the second touch electrode portion 412 by the insulating layer 413, thereby achieving an effect of complete insulation between the two.

[0069] In this embodiment, the second touch electrode second part 4122 adopts a multi-level nanometal network. At the same time, the network line width of the second touch electrode second part 4122 is smaller than the network line width of the second touch electrode first part 4121, and the transmittance of the second touch electrode second part 4122 is 1 / 2 of the transmittance of the second touch electrode first part 4121.

[0070] Therefore, the combined transmittance of the intersection of the first touch electrode and the second touch electrode, the upper and lower parts of the insulating layer, i.e., the second touch electrode second part 4122 and the first touch electrode second part 4112, is equal to the transmittance of the second touch electrode first part 4121 and the first touch electrode first part 4111 in the in-plane touch module, further eliminating the visual dotted appearance formed when the two second parts are stacked due to the wider line width and low transmittance in the stacking area.

[0071] Example 5

[0072] like Figure 8 As shown, it is a schematic diagram of a preferred touch display module of the present invention. The touch display module is stacked from bottom to top, and the second part of the first touch electrode, the insulating layer, and the projection of the second part of the second touch electrode on the color filter are aligned with the black matrix area of ​​the color filter. From top to bottom, it includes a cover plate 10, a bonding glue 20, an upper polarizer 30, a touch function layer 41, a color filter substrate 40, a filter layer 42, a liquid crystal layer 50, a thin film transistor substrate 60, a lower polarizer 70 and a backlight module 80.

[0073] The projections of the first touch electrode second portion 4112, the insulating layer 413, and the second touch electrode second portion 4122 stacked and aligned from bottom to top on the color filter are aligned with the black matrix area 421 of the color filter and are completely covered by the black matrix. The projections of the first touch electrode first portion 4111 and the second touch electrode first portion 4121 on the color filter are aligned with the red, green, and blue pixel areas 422 of the color filter.

[0074] The projection of the stacked structure position that is easy to form a visual dotted appearance (from bottom to top, the second part 4112 of the first touch electrode, the insulating layer 413, and the second part 4122 of the second touch electrode) on the color filter is aligned with the black matrix area 421 of the color filter and is completely covered by the black matrix, which can eliminate its visual dotted appearance; further, the multi-level nano-metal network touch electrode used has the advantages of low resistance, high transmittance, low haze, and high clarity, and has low reflection and low scattering of the output light of the display module, so that the touch display module meets the requirements of ultra-light and ultra-thin, while having the advantages of high sensitivity, high display clarity and low etching marks.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application is described in detail with reference to the embodiments, a person skilled in the art should understand that any modification or equivalent replacement of the technical solution of the present application does not depart from the spirit and scope of the technical solution of the present application and should be included in the scope of the claims of the present application.

Claims

1. A touch display module, comprising a touch module and a display module; the touch module is a multi-level nano-metal network touch module, and the touch function layer in the touch module is located on the upper surface or lower surface of a rigid cover plate, the upper surface or lower surface of an upper polarizer, or the upper surface of a color filter; The touch function layer in the touch module includes a first touch electrode, a second touch electrode and an insulating layer; wherein, The first touch electrode comprises a first part and a second part of the first touch electrode; the second touch electrode comprises a first part and a second part of the second touch electrode; The combined light transmittance of the second portion of the second touch electrode and the second portion of the first touch electrode is equal to the light transmittance of the first portion of the second touch electrode and the first portion of the first touch electrode in the touch module.

2. The touch display module according to claim 1, characterized in that: The touch function layer adopts a jumper bridge design, which includes: a first touch electrode; Insulating layer: arranged on the upper layer of the second part of the first touch electrode, located between the second part of the first touch electrode and the second part of the second touch electrode, and used for electrically insulating the second part of the first touch electrode and the second part of the second touch electrode; and A second touch electrode, wherein the first portion of the second touch electrode is arranged in the same layer as the first portion of the first touch electrode and the second portion of the first touch electrode, the second portion of the second touch electrode is located above the insulating layer and is electrically insulated from the first touch electrode, and is used to connect the first portion of the second touch electrode to jointly form a second touch electrode as a whole.

3. The touch display module according to claim 1, characterized in that: The first touch electrode of the touch module is arranged on the upper surface or the lower surface of the rigid cover plate, or on the upper surface or the lower surface of the upper polarizer of the display module, and the first touch electrode adopts a multi-level nano-metal network; the second touch electrode is arranged on the upper surface of the color filter substrate of the display module, and the second touch electrode adopts a multi-level nano-metal network.

4. The touch display module according to claim 1, characterized in that: When the touch function layer is arranged on the upper surface of the rigid cover plate, the touch display module further comprises a cover plate located on the upper surface of the rigid cover plate and a bonding adhesive for bonding the cover plate.

5. The touch display module according to claim 1, characterized in that: The projections of the second part of the first touch electrode, the insulating layer, and the second part of the second touch electrode, which are aligned from bottom to top, on the color filter are aligned with the black matrix area of ​​the color filter.

6. The touch display module according to claim 1, characterized in that: The rigid cover plate includes: ordinary glass, special glass, tempered glass, acrylic, alloy plate, ceramic plate or composite material plate; a functional layer is also arranged on the surface of the rigid cover plate, and the functional layer includes a hardening layer, an anti-glare layer, an anti-fingerprint layer or an anti-reflection layer.

7. A method for preparing a touch display module, the method adopting a jumper bridge design to prepare a touch function layer on the surface of a rigid cover plate, the steps comprising: 1) directly applying a layer of metal nanowire conductive liquid containing a functional resin solution on the surface of the rigid cover plate to form a metal nanowire conductive layer; 2) preparing a protective layer on the surface of the metal nanowire conductive layer to form a metal nanowire conductive plate; 3) etching the metal nanowire layer to form a first touch electrode and a first part of a second touch electrode of a multi-level nanometal network touch module; 4) preparing an insulating layer on the upper side of the second part of the first touch electrode; 5) A second part of the second touch electrode is prepared above the insulating layer and connected to the first part of the second touch electrode to form a second touch electrode.

8. The method for preparing a touch display module according to claim 7, characterized in that: The functional resin solution comprises a silane coupling agent, a phthalate coupling agent, an organic metal coupling agent and / or a zirconate coupling agent, and the addition amount of the functional resin solution is 0.01%-5%.

9. The method for preparing a touch display module according to claim 7, characterized in that: The conductive liquid containing the functional resin solution or the functional resin solution is applied by spin coating, scraper coating, slit coating, roller coating, micro-concave coating, spray coating, flow coating, inkjet printing or screen printing.

10. The method for preparing a touch display module according to claim 7, characterized in that: The line width of the multi-level nanometal network is 3-50μm, the line spacing is 60-1000μm, and the duty cycle is 45%-96%; the width of the conductive channel between the first touch electrodes and the width of the conductive channel between the second touch electrodes are both 0.05-15mm, and there is an insulating area between two adjacent conductive channels, and the width of the insulating area is 0.1-10mm.

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