TW202232297A - Touch module and touch display module - Google Patents

Abstract

The present disclosure provides a touch module, which includes: a first optically clear adhesive layer; a first touch layer on the first optically clear adhesive layer, the first touch layer including a first transparent conductive layer at a side adjacent to the first optically clear adhesive layer and a first substrate layer; a second optically clear adhesive layer at a side of the first touch layer away from the first optically clear adhesive layer side; a second touch layer at a side of the second optically clear adhesive layer away from the first touch layer, the second touch layer including a second transparent conductive layer and a second substrate layer in turn; a third optically clear adhesive layer at a side of the second touch layer away from the second optically clear adhesive layer side; and a cover on the third optically clear adhesive layer and away from the second touch layer side. The present disclosure also provides a touch display module.

Description

Touch Module and Touch Display Module

The invention relates to the field of touch display, in particular to a touch control module and a touch display module.

The current touch display module usually adopts the in cell mode, that is, the touch module is embedded in the display panel, so that the touch panel and the display panel are integrated. Of course, when the size of the touch display module increases, the cost and difficulty of integration also increase. Therefore, the current larger-sized touch-display module, such as a larger-sized vehicle display screen, still adopts the plug-in type. , that is, the way of placing the touch module outside the display panel. From the perspective of optical reflection, compared with the in-cell mode, the external touch display module adds multiple interfaces, which leads to an increase in the total optical reflectivity of the touch display module. The total reflectivity is related to the reflectivity between each interface, and the reflectivity between each interface is related to the difference between the refractive indices of the two interfaces. Therefore, the total reflectivity of the external touch display module is usually More than 1.5%, higher than the total reflectivity of the touch display module in in cell mode (less than 1%).

One aspect of the present invention provides a touch module, which includes: the first optical adhesive layer; The first touch layer is disposed on the first optical adhesive layer, the first touch layer includes a first transparent conductive layer and a first base material layer in sequence, and the first transparent conductive layer is disposed near the one side of the first optical adhesive layer, the first substrate layer is disposed on the side away from the first optical adhesive layer; a second optical adhesive layer, disposed on the side of the first touch layer away from the first optical adhesive layer; The second touch layer is disposed on the side of the second optical adhesive layer away from the first touch layer. The second touch layer sequentially includes a second transparent conductive material layer and a second base material layer. The second transparent conductive material layer is arranged on a side close to the second optical adhesive layer, and the second substrate layer is arranged on a side away from the second optical adhesive layer; a third optical adhesive layer, disposed on the side of the second touch layer away from the second optical adhesive layer; The cover plate is arranged on the side of the third optical adhesive layer away from the second touch layer.

A second aspect of the present invention provides a touch display module, comprising: a display panel for displaying images; and The touch module is stacked with the display panel, and is used for recognizing touch operations to control the display panel to perform image display, and the touch module is the touch module provided by the first aspect of the present invention.

In the touch module and the touch display module, by setting the stacking sequence of each layer in the first touch layer and the second touch layer, the refractive index difference between each interface in the touch module is changed , thereby reducing the total reflectivity of the touch control module and the touch display module as a whole.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose, the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

Example 1

This embodiment provides a touch display module. Please refer to FIG. 1 together. The touch display module 100 includes a touch module 101 and a display panel 102. The touch module 101 and the display panel 102 are stacked and disposed . The touch module 101 includes: a first optical adhesive layer 10 disposed at a position of the touch module 101 close to the display panel 102 so that the touch module 101 and the display panel 102 are adhered; the first touch layer 20 is disposed on The first optical adhesive layer 10 is on a side away from the display panel 102 ; the second optical adhesive layer 30 is disposed on the side of the first touch layer 20 away from the first optical adhesive layer 10 ; the second touch layer 40 is disposed on the first touch layer 20 . The two optical adhesive layers 30 are located on the side away from the first touch layer 20 ; the third optical adhesive layer 50 is located on the side of the second touch layer 40 away from the second optical adhesive layer 30 ; the cover plate 60 is located on the third The optical adhesive layer 50 is away from the side of the second touch layer 40 . The display panel 102 is used to display images. The first touch layer 20 and the second touch layer 40 cooperate to recognize touch operations on the touch display module 100 to control the display panel 102 to display images.

In this embodiment, the first touch layer 20 includes a first transparent conductive layer 23 , a first index matching layer 25 and a first base material layer 27 in sequence. The first transparent conductive layer 23 is located on the side of the first touch layer 20 close to the first optical adhesive layer 10 , and the first substrate layer 27 is located on the side of the first touch layer 20 close to the second optical adhesive layer 30 . The second touch layer 40 includes a second transparent conductive layer 43 , a second index matching layer 45 and a second base material layer 47 in sequence. The second transparent conductive layer 43 is located on the side of the second touch layer 40 close to the second optical adhesive layer 30 , and the second substrate layer 47 is located on the side of the second touch layer 40 close to the third optical adhesive layer 50 . The first transparent conductive layer 23 is formed with a first touch electrode, the second transparent conductive layer 43 is formed with a second touch electrode, and the first touch electrode and the second touch electrode are respectively the touch module 101 touch driving electrodes and touch sensing electrodes, and cooperate with the sensing touch operation.

The materials of the first transparent conductive layer 23 and the second transparent conductive layer 43 are transparent conductive materials, such as indium tin oxide (Indium Tin Oxide, ITO) or poly(3,4-ethylenedioxythiophene) (PEDOT); The material of the first base material layer 27 and the second base material layer 47 can be transparent organic materials, such as polyethylene terephthalate (Polyethylene Terephthalate, PET) or cyclo-olefin polymer (Cyclo-olefin polymer, COP). For example, in one embodiment, the material of the first transparent conductive layer 23 may be ITO, and the matching material of the first base material layer 27 may be PET; in another embodiment, the material of the first transparent conductive layer 23 may be The material can also be PEDOT, and the matching material of the first base material layer 27 can also be PET. In this embodiment, the material of the first transparent conductive layer 23 and the second transparent conductive layer 43 is ITO, and the material of the first base material layer 27 and the second base material layer 47 is COP. The inventors of the present application have found that, compared to using a metal mesh material as the material of the first transparent conductive layer 23 and the second transparent conductive layer 43 and matching the first substrate layer 27 and the second transparent conductive layer 27 with COP or PET material The base material layer 47, and compared with the use of carbon nanorods (Carbon Nanobud, CNB) as the material of the first transparent conductive layer 23 and the second transparent conductive layer 43 and with polycarbonate (Polycarbonate, PC) or PET material. The first substrate layer 27 and the second substrate layer 47, when the material of the first transparent conductive layer 23 and the second transparent conductive layer 43 are ITO or PEDOT (the material of the first transparent conductive layer 23 and the second transparent conductive layer 43) can be different), and when matched with the first substrate layer 27 and the second substrate layer 47 of COP or PET material (the materials of the first substrate layer 27 and the second substrate layer 47 can be different), other factors are the same In this case, the overall reflectivity of the touch module 101 is lower.

In this embodiment, the first refractive index matching layer 25 and the second refractive index matching layer 45 are refractive index matching materials, and the refractive index of the first refractive index matching layer 25 is located between the refractive index of the first transparent conductive layer 23 and the first refractive index matching layer 23 . Between the refractive indices of a base material layer 27, the refractive index between the first transparent conductive layer 23 and the first base material layer 27 is smoothly transitioned, thereby reducing the reflectivity. The refractive index of the second refractive index matching layer 45 is located between the refractive index of the second transparent conductive layer 43 and the refractive index of the second base material layer 47 , so that between the second transparent conductive layer 43 and the second base material layer 47 The index of refraction transitions smoothly, reducing the total reflectance.

In this embodiment, the thicknesses of the first touch layer 20 and the second touch layer 40 are 40 μm-100 μm, and the square resistances of the first transparent conductive layer 23 and the second transparent conductive layer 43 are 80 Ohm/sq-120 Ohm/sq .

In this embodiment, the material of the cover plate 60 can be glass coated with an anti-reflection film, and the reflectivity is 0.2%-0.8%. In other embodiments, the cover plate 60 can also be an anti-reflection plastic film with the same reflectivity.

In this embodiment, the material of the first optical adhesive layer 10 , the second optical adhesive layer 30 and the third optical adhesive layer 50 is Optically Clear Adhesive (OCA), and the thickness is 50um-100um.

The inventors of the present application found that the stacking order of each layer in the touch module affects the total reflectivity of the touch module. Please refer to FIG. 2 together to compare a touch module G-F/F, a touch module G-F/F-reverse, and a touch module G-F/F-DITO. The meanings of the names of the layers of the touch module in Figure 2 are: AR CG: glass cover with anti-reflection film; OCA: optically transparent adhesive layer; ITO: touch electrode made of indium tin oxide material; IM: refractive index matching layer ; COP: substrate layer. The touch modules G-F/F are arranged on a black matrix (Black Matrix, BM) layer, and a first COP layer, a first IM layer, a first ITO layer, a second OCA layer, a first COP layer, a first IM layer, a first ITO layer, a second OCA layer, a first With two COP layers, a second IM layer, a second ITO layer, a third OCA layer and a glass cover, the reflectivity of the glass cover side of the touch module G-F/F was tested to be 1.67%. The touch module G-F/F- is also disposed on the BM layer, and the BM layer is sequentially laminated with a first ITO layer, a first IM layer, a first COP layer, a second OCA layer, a second ITO layer, For the second IM layer, the second COP layer, the third OCA layer and the cover plate, the reflectivity of the glass cover plate side of the touch module G-F/F_reverse was tested to be 1.35%. The touch module G-F/F-DITO is also disposed on the BM layer, and the BM layer is sequentially laminated with a first ITO layer, a first IM layer, a first COP layer, a second OCA layer, a second COP layer, The second IM layer, the second ITO layer, the third OCA layer and the cover plate, the reflectivity of the glass cover plate side of the touch module G-F/F-DITO was tested to be 1.42%. Therefore, the stacking sequence of the touch module G-F/F-reverse is better than the stacking sequence of the touch module G-F/F and the touch module G-F/F-DITO. That is, the stacking sequence of each layer of the touch module 101 in this embodiment is beneficial to reduce the total reflectivity of the entire touch display module 100 .

In this embodiment, the OCA selected for the third optical adhesive layer 50 has a refractive index range of 1.48-1.53. Please also refer to FIG. 3 to compare the reflectance of OCA with refractive indices (n) of 1.42, 1.49, and 1.68 under touch modules with different structures. The meanings of the names of the layers of each touch module in FIG. 3 are the same as those in FIG. 2 , the abscissa is the touch modules with three different structures, and the ordinate is the total reflectivity. Other conditions remain unchanged. When the material of the third optical adhesive layer 50 is OCA with a refractive index of 1.49, the total reflectivity of the three touch modules in FIG. 3 is the lowest.

In this embodiment, the refractive index range of the first optical adhesive layer 10 and the second optical adhesive layer 30 is 1.54-1.65. Since the first optical adhesive layer 10 is adhered to the first transparent conductive layer 23, the second optical adhesive layer 30 is adhered to the second transparent conductive layer 43, ITO (the material of the first transparent conductive layer 23 and the second transparent conductive layer 43) ) has a refractive index range of 1.8-2.0, so the refractive indices of the first optical adhesive layer 10 and the second optical adhesive layer 30 should be matched with the ITO material. For example, please refer to FIG. 4 , wherein the abscissa is the refractive index of the first optical adhesive layer 10 and the second optical adhesive layer 30 , and the ordinate is the total reflectivity of the touch module 101 . When the refractive index of the first optical adhesive layer 10 and the second optical adhesive layer 30 is 1.61, the total reflectivity of the touch module 101 is 1.08%. In another embodiment, the refractive index range of the first optical adhesive layer 10 and the second optical adhesive layer 30 can also be 1.54-1.65, and the structure of the touch module can be the touch module G-F/F in FIG. 3 . , wherein the refractive index of the first optical adhesive layer 10 corresponds to the refractive index of the second OCA layer in the touch module G-F/F, and the refractive index of the second optical adhesive layer 30 corresponds to the third OCA layer in the touch module G-F/F. , the reflectivity of the touch module can also be reduced.

In this embodiment, by selecting ITO as the material of the first transparent conductive layer 23 and the second transparent conductive layer 43, and selecting COP as the material of the first base material layer 27 and the second base material layer 47, the total reflection can be achieved. The total reflectivity is lower than that of touch modules with other materials; by setting the stacking sequence of each layer of the touch module 101, the total reflectivity can be lower than that of touch modules with other structures; at the same time, by adjusting the first optical adhesive layer 10 , the refractive index of the second optical adhesive layer 30 and the third optical adhesive layer 50 can further reduce the total reflectivity to reach the total reflectivity close to the in cell mode.

Embodiment 2

This embodiment provides a touch display module, and the same components in the touch display module of this embodiment as those in the touch display module of the first embodiment use the same component symbols. Please also refer to FIG. 5 , the touch display module 200 includes a touch module 201 and a display panel 102 , and the touch module 101 and the display panel 102 are stacked and disposed. The touch module 101 includes: a first optical adhesive layer 10 disposed at a position of the touch module 201 close to the display panel 102, so that the touch module 201 is adhered to the display panel 102; the first touch layer 20 is disposed on the display panel 102 The first optical adhesive layer 10 is on a side away from the display panel 102 ; the second optical adhesive layer 30 is disposed on the side of the first touch layer 20 away from the first optical adhesive layer 10 ; the second touch layer 40 is disposed on the first touch layer 20 . The two optical adhesive layers 30 are located on the side away from the first touch layer 20 ; the third optical adhesive layer 50 is located on the side of the second touch layer 40 away from the second optical adhesive layer 30 ; the cover plate 60 is located on the third The optical adhesive layer 50 is away from the side of the second touch layer 40 .

In this embodiment, the first touch layer 20 includes a first transparent photoresist layer 21 , a first transparent conductive layer 23 , a first index matching layer 25 and a first base material layer 27 in sequence. The first transparent photoresist layer 21 is located on the side of the first touch layer 20 close to the first optical adhesive layer 10 , and the first substrate layer 27 is located on the side of the first touch layer 20 close to the second optical adhesive layer 30 . The second touch layer 40 sequentially includes a second transparent photoresist layer 41 , a second transparent conductive layer 43 , a second refractive index matching layer 45 and a second base material layer 47 . The second transparent photoresist layer 41 is located on the side of the second touch layer 40 close to the second optical adhesive layer 30 , and the second substrate layer 47 is located on the side of the second touch layer 40 close to the third optical adhesive layer 50 .

In this embodiment, the materials of the first transparent photoresist layer 21 and the second transparent photoresist layer 41 may be organic-inorganic hybrid photosensitive polymer light-transmitting materials, and the refractive index ranges from 1.54 to 1.65. Please also refer to FIG. 6 , in which the abscissa is the refractive index of the first transparent photoresist layer 21 and the second transparent photoresist layer 41 , and the ordinate is the total reflectivity of the touch module 201 . When the refractive indices of the first transparent photoresist layer 21 and the second transparent photoresist layer 41 are 1.54-1.65, the total reflectivity of the touch module 201 is lower than 0.8%, which is effectively reduced.

In this embodiment, the total reflectivity of the touch display module 200 is the sum of the total reflectivity of the touch module 201 and the reflectivity of the display panel 102 . The reflectivity of the display panel 102 is 0.1%, so the total reflectivity of the touch display module 200 is less than 0.9%, which is equal to or close to the total reflectivity of the touch display module in the in cell mode. Therefore, by disposing the first transparent photoresist layer 21 and the second transparent photoresist layer 41 in the touch module 201, the total reflectivity of the touch display module 200 can be reduced to less than 1%.

Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present invention, not to limit the present invention, as long as the above embodiments are suitable for the scope of the spirit of the present invention Variations and variations fall within the scope of the claimed invention.

100, 200: touch display module 101, 201: Touch Module 10: The first optical adhesive layer 20: The first touch layer 21: The first transparent photoresist layer 23: The first transparent conductive layer 25: The first index matching layer 27: The first substrate layer 30: Second Optical Adhesive Layer 40: The second touch layer 41: Second transparent photoresist layer 43: The second transparent conductive layer 45: Second index matching layer 47: Second substrate layer 50: The third optical adhesive layer 60: cover plate 102: Display panel

FIG. 1 is a structural diagram of a touch display module according to Embodiment 1 of the present application.

FIG. 2 is a comparison diagram of reflectivity of different touch modules in Embodiment 1 of the present application.

FIG. 3 is a comparison diagram of reflectivity of different optical adhesives in Example 1 of the present application.

FIG. 4 is a broken line diagram showing the change of the reflectivity with the refractive index of the optical glue in the first embodiment of the present application.

FIG. 5 is a structural diagram of a touch display module according to Embodiment 2 of the present application.

FIG. 6 is a graph showing the change of the reflectivity with the refractive index of the transparent photoresist layer in the second embodiment of the present application.

100: touch display module

101: Touch Module

10: The first optical adhesive layer

20: The first touch layer

23: The first transparent conductive layer

25: The first index matching layer

27: The first substrate layer

30: Second Optical Adhesive Layer

40: The second touch layer

43: The second transparent conductive layer

45: Second index matching layer

47: Second substrate layer

50: The third optical adhesive layer

60: cover plate

102: Display panel

Claims (14)

A touch module, the improvement of which includes: a first optical adhesive layer; A first touch layer is disposed on the first optical adhesive layer, the first touch layer includes a first transparent conductive layer and a first substrate layer in sequence, and the first transparent conductive layer is disposed adjacent to the first transparent conductive layer. One side of an optical adhesive layer, the first substrate layer is disposed on a side away from the first optical adhesive layer; a second optical adhesive layer disposed on the side of the first touch layer away from the first optical adhesive layer; A second touch layer is disposed on the side of the second optical adhesive layer away from the first touch layer. The second touch layer sequentially includes a second transparent conductive material layer and a second substrate layer. The second transparent conductive material layer is arranged on the side close to the second optical adhesive layer, and the second substrate layer is arranged on the side away from the second optical adhesive layer; a third optical adhesive layer disposed on the side of the second touch layer away from the second optical adhesive layer; A cover plate is disposed on the side of the third optical adhesive layer away from the second touch layer. The touch module according to claim 1, wherein the refractive indices of the first optical adhesive layer and the second optical adhesive layer are both 1.54-1.65. The touch module according to claim 2, wherein the thickness of the first optical adhesive layer and the second optical adhesive layer is 50 μm-100 μm. The touch module according to claim 2, wherein the refractive index of the third optical adhesive layer is 1.48-1.53. The touch module of claim 1, wherein the first touch layer further comprises a first transparent photoresist layer, and the first transparent photoresist layer is disposed on the first transparent conductive layer away from the first base one side of the material layer; the second touch layer further includes a second transparent photoresist layer, the second transparent photoresist layer is disposed on the side of the second transparent conductive layer away from the second base material layer. The touch module according to claim 5, wherein the refractive indices of the first photoresist layer and the second photoresist layer are 1.54-1.65. The touch module of claim 1, wherein the first touch layer further comprises a first refractive index matching layer disposed between the first transparent conductive layer and the first substrate layer, the first The refractive index of a refractive index matching layer is located between the refractive index of the first transparent conductive layer and the refractive index of the first substrate layer; the second touch layer further includes a second refractive index matching layer disposed on the Between the second transparent conductive layer and the second substrate layer, the refractive index of the second refractive index matching layer is located between the refractive index of the second transparent conductive layer and the refractive index of the second substrate layer. The touch module according to claim 1, wherein the materials of the first transparent conductive layer and the second transparent conductive layer are indium tin oxide. The touch module according to claim 1, wherein the materials of the first base material layer and the second base material layer are cycloolefin polymers. The touch module according to claim 1, wherein the reflectivity of the cover plate is 0.2%-0.8%. The touch module of claim 1, wherein the refractive indices of the first optical adhesive layer, the second optical adhesive layer and the third optical adhesive layer are all 1.48-1.53. The touch module of claim 11, wherein the thickness of the first optical adhesive layer, the second optical adhesive layer and the third optical adhesive layer is 50 μm-100 μm. The touch module according to any one of claims 1 to 12, wherein the thickness of the first touch layer and the second touch layer is 40 μm-100 μm. A touch display module, the improvement of which includes: a display panel for displaying images; and A touch module is stacked on the display panel for recognizing touch operations to control the display panel to display images, the touch module is the touch module according to any one of claim 1-13 Group.

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