TWI603238B - Touch display device - Google Patents

Description

Touch display device

The present invention relates to a touch display device.

Display devices with touch functions have been widely used in the daily life of users. As shown in FIG. 1 , the touch control module 100 having the touch detection function and the display module 200 having the image display function are fully attached and fixed by the optical adhesive 300 to form the touch display device 10 . At the time of fabrication, the optical adhesive 300 is first coated and pre-cured by a slit coating method on the touch module 100, and then the display module 200 is attached to the optical adhesive 300. However, when the touch display device 10 is tested, it is found that a large amount of air bubbles are generated between the touch module 100 and the display module 200, and the light is refracted by the air bubbles, thereby displaying the touch display device 10. Poor effect and poor quality.

In view of this, it is necessary to provide a touch display device with better display effect.

A touch display device includes a touch module and a display module. The touch module and the display module are bonded by an adhesive layer. The touch module and the display module have a first bonding surface, and the other has a second bonding surface, wherein the first bonding surface is a planar structure, and the second bonding surface is a non-planar structure. The second bonding surface includes an intermediate portion and a peripheral portion adjacent to the intermediate portion, the intermediate portion protruding toward the first bonding surface with respect to the peripheral portion, and the adhesive layer is bonded to the first portion The adhesive surface and the second adhesive surface, and the adhesive layer covers at least an intermediate portion of the second adhesive surface and a peripheral portion adjacent to the intermediate portion.

Compared with the prior art, the touch module or the display module is provided with a non-planar bonding surface, thereby being non-planar when the adhesive material is applied to the touch module or the display module to form an adhesive layer. The adhesive surface provides an accommodating space for the adhesive material to prevent the adhesive material from being stacked on the edge region of the touch module or the display module, so that the thickness of the adhesive layer coated on the touch module is uniform and uniform, so that the adhesive layer and the adhesive layer The first bonding surface is a flat surface to prevent the generation of bubbles and improve the display quality of the touch display device.

10, 1, 2, 3‧‧‧ touch display devices

100, 15, 25, 35‧‧‧ touch modules

200, 11, 21, 31‧‧‧ display modules

300‧‧‧Optical adhesive

13, 23, 33‧‧ ‧ adhesive layer

Intermediate area of 131, 231, 331‧‧

132, 232, 332‧‧ ‧ marginal zone

P1‧‧‧ first edge

P2‧‧‧ second edge

110, 210, 350‧‧‧ first bonding surface

150, 250, 310‧‧‧ second bonding surface

141, 241, 341‧‧‧ first plane

143, 243, 343‧‧‧ second plane

S‧‧‧step structure

F1‧‧‧transparent film

151, 251, 351‧‧‧ substrates

252‧‧‧Sensing electrode layer

253‧‧‧Protective layer

311‧‧‧ display panel

313‧‧‧ polarizer

313a‧‧‧First TAC layer

313b‧‧‧ polarizing layer

313c‧‧‧Second TAC layer

313d‧‧‧First adhesive layer

X3’‧‧‧projection position

X‧‧‧ first direction

Y‧‧‧second direction

Z‧‧‧ third direction

X1‧‧‧ first position

X2‧‧‧ second position

X3‧‧‧ third position

A‧‧‧Intermediate

B‧‧‧ peripherals

H1‧‧‧first thickness

H2‧‧‧second height

L1‧‧‧ first distance

L2‧‧‧Second distance

1 is a schematic perspective view of a touch display device in the prior art.

FIG. 2 is an enlarged schematic cross-sectional view of the touch display device of FIG. 1. FIG.

FIG. 3 is a schematic perspective structural view of a touch display device according to a first embodiment of the present invention.

4 is a cross-sectional structural view of the touch display device shown in FIG. 2 along the line IV-IV in the first direction.

FIG. 5 is a cross-sectional structural view of the touch display device shown in FIG. 2 along the V-V line in the second direction.

FIG. 6 is a cross-sectional structural diagram of a touch display device according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional structural diagram of a touch display device according to a third embodiment of the present invention.

Fig. 8 is a schematic structural view of the polarizer shown in Fig. 7.

The inventors have intensively studied and found that a large number of air bubbles appear in the touch display device 10 shown in FIG. 1 because: as shown in FIG. 2, it is a partial cross-sectional enlarged view of the touch display device 10 shown in FIG. When the optical adhesive 300 is applied to the touch module 100, the coated optical adhesive material The contact with the air causes the surface tension of the optical adhesive material applied to the touch module 100 to be different, so that the optical adhesive material located at the edge of the touch module 100 is stacked, and the optical adhesive 300 is in the middle of the touch module 100. The thickness of the portion (image display area) is greater than the thickness of the edge portion (non-image display area, peripheral area), thereby causing a large air gap between the touch module 100 and the display module 200. As a result, the touch module 100 and the display module 200 have a large number of bubbles after the bonding is completed.

Specifically, since the optical adhesive 300 is in a liquid state when the slit coating is applied, there is a thickness difference d2 between the thickness of the edge portion and the thickness d1 of the intermediate portion, and the thickness difference d1 is the thickness d1 of the intermediate portion of the optical adhesive 300. 5%-20%.

Please refer to FIG. 3 , which is a perspective view of a touch display device 1 according to a first embodiment of the present invention.

The touch display device 1 includes a display module 11 for displaying an image and a touch module 15 for detecting a touch operation. The display module 11 and the touch module 15 are attached by an adhesive layer 13 . In this embodiment, the display module 11 and the touch module 15 are fully attached, and the adhesive layer 13 at least completely covers the display area (not labeled) of the touch display device 10. In other embodiments, the display module 11 and the touch module 15 can also be edge-fitted, that is, the adhesive layer 13 is only corresponding to the non-display area of the touch display device 10 (not labeled), and Not limited to the limit.

In the embodiment, the touch display device 1 has a rectangular parallelepiped structure. The first direction X is the width extension direction of the touch display device 1 , the second direction Y is the length extension direction of the touch display device 1 , and the third direction Z is the touch. The thickness of the display device 1 extends. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. In this embodiment, the display module 11 is a liquid crystal display module. It can be understood that the liquid crystal display module includes an array substrate on which active elements are disposed, a liquid crystal layer, a color filter substrate, and a polarizer (not shown). The touch module 15 is a capacitive touch module. of course, In other embodiments, the touch module 15 can also be other types of touch modules, such as a resistive or infrared touch module, and is not limited thereto. The adhesive layer 13 is a transparent liquid optical adhesive (OCR) which is formed on the touch module 15 by a slit coating method.

Please refer to FIG. 4-5 , which are schematic diagrams of the cross-sectional structure of the touch display device 1 along the line IV-IV in the first direction X and along the line V-V in the second direction Y, as shown in FIG. 3 .

The display module 11 has a first bonding surface 110, and the first bonding surface 110 has a planar structure. In this embodiment, the first bonding surface 110 can be a surface of an element such as a polarizer or a color filter substrate (not shown) in the display module 11.

The touch module 15 has a second bonding surface 150, and the second bonding surface 150 has a non-planar structure.

The second bonding surface 150 includes an intermediate portion A and a peripheral portion B adjacent to the intermediate portion. The intermediate portion A protrudes toward the first adhesive surface 110 with respect to the peripheral portion B.

The first bonding surface 110 and the second bonding surface 150 are in contact with the bonding layer 13 , and the bonding layer 13 is bonded to the first bonding surface 110 and the second bonding surface 150 , so that the display module 11 and the touch module 15 are Fixed to each other. The adhesive layer 13 covers at least a part of the intermediate portion A of the second bonding surface 150 and a portion of the peripheral portion B adjacent to the intermediate portion A.

The non-planar second bonding surface 150 is used to adjust the shape structure when the adhesive layer 13 is bonded to the first bonding surface 110. More specifically, the non-planar second bonding surface 150 bonds the bonding layer 13 to the first bonding surface 110. The time is a planar structure, so that when the display module 11 and the adhesive layer 13 are bonded, the air gap is reduced, and the probability of generating bubbles during the bonding is reduced.

Specifically, the touch module 15 includes at least one substrate 151 having opposite first edges P1. It can be understood that the substrate 151 is provided with a plurality of sensing units for sensing a touch operation.

The adhesive layer 13 includes an intermediate portion 131 and an edge region 132, wherein the edge region 132 surrounds the intermediate portion 131. The intermediate portion 131 corresponds to the intermediate portion A of the second bonding surface 150, and the intermediate portion 131 has a first thickness H1. The edge region 132 corresponds to the peripheral portion B.

The adhesive layer 13 has two opposite second edges P2 corresponding to the edge regions 132, and the second edges P2 are adjacent to the first edges P1. The second edge P2 and the substrate 151 intersect the first position X1 of the substrate 151, and the first position X1 and the first edge P1 have a first distance L1. The second edge P2 is in a non-planar shape. Preferably, the second edge P2 is located in the non-visible area of the touch display device 1 .

The intermediate portion A and the peripheral portion B intersect at a second position X2 of the substrate 151, and the second position X2 is away from the first edge P1 than the first position X1.

Specifically, the intermediate portion A of the second bonding surface 150 includes a first plane 141 and a second plane 143 at both ends of the first plane 141 and connected to the first plane 141. The second plane 143 and the peripheral portion B correspond to the second position X2 of the substrate 151. In the embodiment, the second plane 143 and the peripheral portion B intersect at the second position X2 of the substrate 151. The first plane 141, the second plane 143 and the peripheral portion B form a step structure S having a second height H2, which is the first thickness H1 of the adhesive layer 13 corresponding to the intermediate portion 131. 5%-20%. The adhesive layer 13 at least partially covers the step structure S. Thus, the step structure S provides a large receiving space for the adhesive layer 13 at the second position X2.

In this embodiment, the first plane 141 is parallel to the substrate 151, and the second plane 143 is perpendicular to the first plane 141 and the substrate 151. Of course, in other embodiments of the present invention, the second plane 143 may also be connected to the substrate 151 at an acute angle. Correspondingly, the second plane 143 is connected to the first plane 141 at an obtuse angle.

The second position X2 and the first edge P1 have a second distance L2, and the second distance L2 is greater than the first distance L1.

In the embodiment, the intermediate portion A is formed on the surface of a transparent film F1 disposed on the substrate 151, that is, the first plane 141 and the second plane 143 are formed by the surface of the transparent film F1, and the peripheral portion B is composed of the surface of the substrate 151. The coating surface formed or coated on the substrate 151 is constructed. It can be understood that the coated surface on the substrate 151 includes an ink layer, a planarization layer or other layer structure.

The material of the transparent film F1 is polyethylene terephthalate (PET) or polymethyl methacrylate (PMMA). The transparent film F1 and the adhesive layer 13 have the same refractive index, and the refractive index ranges from 1.3 to 1.8. The thickness of the transparent film F1 is equal to the second height H2 corresponding to the step structure S, and the adhesive layer 13 corresponds to the intermediate portion 131. The first thickness H1 is 5%-20% to ensure the uniformity and uniformity of light transmission between the transparent film F1 and the adhesive layer 13.

Please refer to FIG. 6 , which is a cross-sectional structural diagram of the touch display device 2 in the second embodiment.

The touch display device 2 includes a display module 21 and a touch module 25 . The display module 21 and the touch module 25 are bonded by the adhesive layer 23 . The display module 21 and the touch module 25 are bonded by the adhesive layer 23 in a fully bonded manner. The display module 21 has a first bonding surface 210, and the first bonding surface 210 has a planar structure. As described in the first embodiment, the first bonding surface 110 can be a surface of an element such as a polarizer or a color filter substrate in the display module 11. The touch module 25 has a second bonding surface 250, and the second bonding surface 250 has a non-planar structure.

Specifically, the touch module 25 includes a substrate 251, a sensing electrode layer 252, and a protective layer 253 which are sequentially disposed. The substrate 251 is in contact with the adhesive layer 23. The sensing electrode layer 252 is disposed on the surface of the touch module 25 away from the display module 21, and the protective layer 253 is located on the surface of the sensing electrode layer 252 for protecting the sensing electrode layer 252. It can be understood that the sensing electrode layer 252 is provided with a plurality of sensing electrodes (not shown) for sensing a touch operation of the user, and correspondingly outputting a sensing signal, thereby recognizing the touch. The specific location of the operation. In the present embodiment, the material of the substrate 251 is glass. In other embodiments, the substrate 251 may be made of PET.

The second bonding surface 250 is composed of a surface of the substrate 251 adjacent to the bonding layer 23 side, wherein the second bonding surface 250 includes an intermediate portion A and two peripheral portions B adjacent to the intermediate portion. The intermediate portion A protrudes toward the first bonding surface 210 with respect to the peripheral portion B.

The first bonding surface 210 and the second bonding surface 250 are in contact with the bonding layer 23 , and the bonding layer 23 is bonded to the first bonding surface 210 and the second bonding surface 250 , so that the display module 21 and the touch module 25 are Fixed to each other. The adhesive layer 23 covers at least a part of the intermediate portion A of the second bonding surface 250 and a portion of the peripheral portion B adjacent to the intermediate portion A.

The non-planar second bonding surface 250 has a planar structure when the bonding layer 23 is bonded to the first bonding surface 210, so that the display module 21 and the bonding layer 13 are bonded without an air gap, thereby reducing the probability of generating bubbles when bonding.

The adhesive layer 23 includes an intermediate zone 231 and an edge zone 132, wherein the edge zone 232 surrounds the intermediate zone 231. The intermediate portion 231 corresponds to the intermediate portion A of the second bonding surface 250, and the intermediate portion 231 has a first thickness H1. The edge region 232 corresponds to the peripheral portion B.

The adhesive layer 23 has two opposite second edges P2 corresponding to the edge regions 232, and the second edges P2 are adjacent to the first edges P1. The second edge P2 and the substrate 251 intersect the first position X1 of the substrate 251, and the first position X1 and the first edge P1 have a first distance L1. The second edge P2 is a non-planar shape.

Specifically, the intermediate portion A of the second bonding surface 250 includes a first plane 241 and a second plane 243 located at both ends of the first plane 241 and connected to the first plane 241. The second plane 243 intersects the peripheral portion B at a second position X2 of the substrate 251. The first plane 241, the second plane 243, and the peripheral portion B constitute a step structure S. The adhesive layer 23 at least partially covers the step structure S. As described in the previous embodiment, the second height H2 of the step structure S is the first of the intermediate portion 231 of the adhesive layer 23. 5%-20% of thickness H1. Thus, the step structure S provides a large receiving space for the adhesive layer 23 at the second position X2.

In this embodiment, the first plane 241 is parallel to the substrate 251, and the second plane 243 is perpendicular to the first plane 241 and the substrate 151. Of course, in other embodiments of the present invention, the second plane 243 may also be connected to the substrate 151 at an acute angle. Correspondingly, the second plane 243 is connected to the first plane 141 at an obtuse angle.

In the present embodiment, the first plane 241, the second plane 243, and the peripheral portion B corresponding to the intermediate portion A are both formed on the surface of the substrate 251. Of course, the peripheral portion B may be formed of a coated surface coated on the substrate 151.

Compared with the prior art, since the corresponding edge portions of the touch modules 15 and 25 are provided with non-planar bonding surfaces, when the bonding materials are applied to the touch modules 15 and 25 to form the adhesive layers 13 and 23, Providing an accommodating space for the adhesive material at the edge of the touch modules 15 and 25, preventing the adhesive material from being stacked on the edge regions of the touch modules 15 and 25, and ensuring the adhesive layer coated on the touch modules 15 and 25. The thicknesses of the pillars 13 and 23 are uniform and uniform, so that the adhesive layers 13 and 23 are in planar contact with the first adhesive faces 110 and 210.

Please refer to FIG. 7 , which is a cross-sectional structural diagram of a touch display device 3 according to a third embodiment of the present invention.

The touch display device 3 includes a display module 31 and a touch module 35. The display module 31 and the touch module 35 are bonded by an adhesive layer 33. The adhesive layer 33 completely covers the touch module 35 or the display module 31, that is, the display module 31 and the touch module 35 are fully attached. The display module 31 is configured to display an image, and the touch module 35 is configured to detect a touch operation of the user and identify a coordinate position of the touch operation.

The touch module 35 has a first bonding surface 350, and the first bonding surface 350 has a planar structure. The touch module 35 includes at least one substrate 351 having opposite first sides. Edge P1. It can be understood that a plurality of sensing units (not shown) are disposed on the substrate 151 for sensing a touch operation. The substrate 351 is adjacent to the surface of the adhesive layer 33 as the first bonding surface 350.

The adhesive layer 33 includes an intermediate portion 331 and an edge region 332, wherein the edge region 332 surrounds the intermediate portion 331. The intermediate portion 331 corresponds to the intermediate portion A of the first bonding surface 350, and the intermediate portion 331 has a first thickness H1. The edge region 332 corresponds to the peripheral portion B.

The adhesive layer 33 has two opposite second edges P2 corresponding to the edge regions 332, and the second edges P2 are adjacent to the first edges P1. The second edge P2 intersects the substrate 351 at a first position X1, and the first position X1 and the first edge P1 have a first distance L1.

The display module 31 includes a display panel 311 for displaying an image, and a polarizer 313 disposed on a surface of the display panel 311 adjacent to the adhesive layer 33. The polarizer 313 is used for the self-display panel. The light emitted by 311 is deflected.

The display module 31 has a second bonding surface 310. The surface of the polarizing plate 313 of the display module 31 adjacent to the adhesive layer 33 serves as the second bonding surface 310. The second bonding surface 310 has a non-planar structure. The second bonding surface 310 includes an intermediate portion A and two peripheral portions B adjacent to the intermediate portion. The intermediate portion A protrudes toward the first bonding surface 350 with respect to the peripheral portion B.

The first bonding surface 350 and the second bonding surface 310 are in contact with the bonding layer 33 , and the bonding layer 33 is bonded to the first bonding surface 350 and the second bonding surface 310 , so that the display module 31 and the touch module 35 are Fixed to each other. The adhesive layer 33 covers at least a part of the intermediate portion A of the second bonding surface 310 and a portion of the peripheral portion B adjacent to the intermediate portion A.

The non-planar second adhesive surface 310 is used to adjust the shape of the adhesive layer 33 when the first adhesive surface 350 is bonded to the first adhesive surface 350. More specifically, the non-planar second adhesive surface 310 bonds the adhesive layer 33 to the first adhesive surface 350. The time is a planar structure, so that the display module 31 and the adhesive layer 33 are bonded without an air gap.

Specifically, the second bonding surface 310 includes a first plane 341 and a second plane 343 at both ends of the first plane 341 and connected to the first plane 341. The second plane 343 intersects the polarizer 313 at the third. Location X3. The first plane 341, the second plane 343, and the peripheral portion B constitute a step structure S. As described in the previous embodiment, the second height H2 of the step structure S is the first thickness H1 of the intermediate portion 231 of the adhesive layer 23. 5%-20%. Thus, the step structure S provides a large receiving space for the adhesive layer 33 at the third position X3.

In this embodiment, the first plane 341 is parallel to the substrate 315 , and the second plane 343 is perpendicular to the first plane 341 and the substrate 315 . Of course, in other embodiments, the second plane 343 may also be connected at an obtuse angle to the first plane 341.

The third position X3 is away from the first edge P1 at the projection position X3' of the substrate 351 from the first position X1. And a second distance L2 between the projection position X3' and the first edge P1, the second distance L2 being greater than the first distance L1.

Please refer to FIG. 8 , which is a schematic structural view of the polarizer 313 as shown in FIG. 7 . The polarizer 313 includes a first TAC layer 313a, a polarizing layer 313b, a second TAC layer 313c, and a first adhesive layer 313d which are sequentially disposed. The first adhesive layer 313d is used to attach the polarizer 313 to the display panel 311. The material of the first TAC layer 313a and the second TAC layer 313c are both polyvinyl cellulose triacetate (TAC) or cycloolefin polymer (COP), and the material of the polarizing layer 313b is polyvinyl alcohol (PVA), first The adhesive layer 313d is a release pressure sensitive adhesive (PSA).

In the present embodiment, the intermediate portion A is a structural surface of the first TAC layer 313a protruding toward the adhesive layer 33, that is, the first plane 341 and the second plane 343 corresponding to the intermediate portion A and the partial peripheral portion B are both the first TAC layer. The surface composition of 313a.

Of course, the present invention is not limited to the above-disclosed embodiments, and the present invention may be variously modified in the above embodiments. Those skilled in the art will understand that as long as the present invention is Appropriate changes and modifications of the above embodiments are intended to fall within the scope of the invention as claimed.

1‧‧‧Touch display device

11‧‧‧Display module

13‧‧‧Adhesive layer

15‧‧‧Touch Module

131‧‧‧Intermediate area

132‧‧‧Edge area

P1‧‧‧ first edge

P2‧‧‧ second edge

110‧‧‧First bonding surface

150‧‧‧second bonding surface

141‧‧‧ first plane

143‧‧‧ second plane

S‧‧‧step structure

F1‧‧‧transparent film

151‧‧‧Substrate

X1‧‧‧ first position

X2‧‧‧ second position

A‧‧‧Intermediate

H1‧‧‧first thickness

H2‧‧‧second height

L1‧‧‧ first distance

L2‧‧‧Second distance

B‧‧‧ peripherals

Claims (15)

A touch display device includes a touch module and a display module, wherein the touch module and the display module are bonded by an adhesive layer, wherein one of the touch module and the display module Having a first bonding surface, the other having a second bonding surface, wherein the first bonding surface is a planar structure, and the second bonding surface is a non-planar structure, wherein the second bonding surface includes an intermediate portion and is adjacent to the intermediate portion In the peripheral portion, at least two ends of the intermediate portion are adjacent to the peripheral portion, the intermediate portion is convex toward the first adhesive surface with respect to the peripheral portion, and the adhesive layer is bonded to the first adhesive surface and the second adhesive surface, and the adhesive portion The adhesive layer covers at least an intermediate portion of the second bonding surface and a peripheral portion adjacent to the intermediate portion. The touch display device of claim 1, wherein the intermediate portion has a first plane and a second plane adjacent to both ends of the first plane, the first plane, the second plane, and the peripheral portion In a stepped structure, the adhesive layer at least partially covers the step structure, and the step structure is used to provide a receiving space for the adhesive layer at the surrounding portion. The touch display device of claim 2, wherein the adhesive layer has an intermediate portion and an edge region, the intermediate portion corresponding to an intermediate portion of the second adhesive surface, the edge region corresponding to a peripheral portion of the second adhesive surface, The intermediate zone has a first thickness, the stepped structure having a first height that is between 5% and 20% of the first thickness. The touch display device of claim 2, wherein the touch module comprises at least one substrate, the substrate has a first edge, and the adhesive layer intersects the substrate at a first position, the first position and the first a first distance between the edges, the second plane of the intermediate portion corresponding to the second position of the substrate, the second position having a second distance from the first edge, the second distance being greater than the first distance. The touch display device of claim 4, wherein the second plane intersects or projects the peripheral portion to the second position of the substrate. The touch display device of claim 4, wherein the first plane is parallel to the substrate. The touch display device of claim 4, wherein the second plane is perpendicular to the substrate. The touch display device of any one of the preceding claims, wherein the touch display module has a second bonding surface, the touch display device further includes a substrate, and the middle portion is a setting It is formed on the surface of the transparent film of the substrate. The touch display device of claim 8, wherein the transparent film has the same refractive index of light as the adhesive layer. The touch display device of claim 9, wherein the refractive index of the light ranges from 1.3 to 1.8. The touch display device of claim 9, wherein the transparent film is ethylene terephthalate (PET), polymethyl methacrylate (PMMA) or cycloolefin polymer (COP). The touch display device of claim 1 , wherein the touch display device has the second bonding surface, the touch display device further includes a substrate, the middle portion and the peripheral portion Both are the surfaces of the substrate. The touch display device of any one of claims 1-7, wherein the display module has the second bonding surface, the display module comprises a polarizer, and the second bonding surface is formed on the polarizer. The touch display device of claim 13, wherein the polarizer comprises a polarizing layer and at least one polylactic acid triacetate (TAC) layer covering the polarizing layer, wherein the second bonding surface is the at least one TAC layer s surface. The touch display device of claim 14, wherein the number of the at least one TAC layer is two, and the polarizer further comprises a first adhesive layer, the polarizing layer being located between the two TAC layers, the first An adhesive layer is located away from the surface of the TAC layer having the second adhesive surface.