CN110703951A

CN110703951A - Touch display composite layer, flexible display screen and electronic equipment

Info

Publication number: CN110703951A
Application number: CN201910965173.XA
Authority: CN
Inventors: 贾玉虎
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2020-01-17
Anticipated expiration: 2039-10-11
Also published as: CN110703951B

Abstract

The disclosure provides a touch display composite layer, a flexible display screen and an electronic device. The touch display composite layer comprises a display layer structure and a touch layer structure which are sequentially stacked; the touch layer structure comprises an elastic substrate layer and a touch function layer formed on the elastic substrate layer; the elastic substrate layer comprises a body and a buffering part arranged on the surface of the body, the surface of the buffering part comprises a buffering surface connected with the surface of the body, and the buffering surface and the surface of the body are provided with included angles. The touch display composite layer has high bending reliability.

Description

Touch display composite layer, flexible display screen and electronic equipment

Technical Field

The present disclosure relates to, and in particular, to a touch display composite layer, a flexible display screen, and an electronic device.

Background

In the related art, the touch layer of the flexible display screen is generally located on the upper side of the polarizer, so that the touch layer can cause certain influence on the display effect of the display screen; however, if the touch layer is disposed under the polarizer, the reliability of the bending stress of the touch layer is reduced, thereby limiting the poor bending reliability of the flexible screen.

Disclosure of Invention

One object of the present disclosure is to improve bending reliability of a touch display composite layer.

In order to solve the technical problem, the following technical scheme is adopted in the disclosure:

according to one aspect of the present disclosure, a touch display composite layer is provided, which includes a display layer structure and a touch layer structure stacked in sequence; the touch layer structure comprises an elastic substrate layer and a touch function layer formed on the elastic substrate layer;

the elastic substrate layer comprises a body and a buffering part arranged on the surface of the body, the surface of the buffering part comprises a buffering surface connected with the surface of the body, and the buffering surface and the surface of the body are provided with included angles.

According to another aspect of the present disclosure, a flexible display screen is provided, which has the touch display composite layer.

According to another aspect of the present disclosure, an electronic device is provided, which includes the flexible display screen.

In this disclosure, the touch layer structure and the display layer structure are compounded to form a touch display composite layer, so that the thickness of the substrate and the OCA bonding material are reduced, the thickness of the flexible display screen is reduced, and the bending reliability of the flexible display screen is improved.

Moreover, when the touch display composite layer is bent, the buffer part in the touch layer structure can counteract a part of the pressure on the upper surface and the tensile force on the lower surface of the touch layer structure on the buffer surface, so that the transverse stress in the touch layer structure is reduced; in the longitudinal direction, the thickness of the elastic substrate layer is not uniform, so that the stress neutral layer is not completely distributed on a certain layer of the touch layer structure, but is dispersed on different layers; therefore, when the touch layer structure is bent, the bending failure caused by stress concentration can be avoided, and the bending stability of the touch layer structure is improved; on the other hand, the buffer part which is convexly arranged can also increase the local thickness of the elastic substrate layer, so that the bending stress resistance of the touch display composite layer is improved.

Therefore, the touch display composite layer has better bending stability.

Drawings

FIG. 1 is a diagram of a touch display composite layer according to an embodiment of the present disclosure;

FIG. 2 is a block diagram of another embodiment of a touch display composite layer according to the present disclosure;

fig. 3 is a view showing a folded structure of fig. 2.

The reference numerals are explained below:

1. touch control display composite layer; 11. a touch layer structure; 12. a display layer structure; 111. an emission layer; 112. an elastic backing layer; 113. a receiving layer; 1121. a body; 1122. a buffer section; 1123. a buffer surface; 114. an isolation layer; 121. a thin film encapsulation layer; 1211. a first inorganic encapsulation layer; 1212. an intermediate organic layer; 1213. a second inorganic encapsulation layer; 122. a light emitting layer; 1221. a reinforcing groove;

2. a substrate; 3. and protecting the cover plate layer.

Detailed Description

While this disclosure may be susceptible to embodiment in different forms, there is shown in the drawings and will herein be described in detail only some specific embodiments thereof with the understanding that the present description is to be considered as an exemplification of the principles of the disclosure and is not intended to limit the disclosure to that as illustrated herein.

Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the disclosure, and not to imply that every embodiment of the disclosure must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.

In the embodiments shown in the drawings, directional references (such as upper, lower, left, right, front and rear) are used to explain the structure and movement of the various elements of the disclosure not absolutely, but relatively. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indication of these directions changes accordingly.

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.

Preferred embodiments of the present disclosure are described in further detail below with reference to the accompanying drawings of the present specification.

The present disclosure provides a touch layer structure 11, a touch display composite layer 1 and a flexible screen. On one hand, the flexibility of the arrangement of the touch layer structure 11 is improved by improving the bending reliability of the touch layer structure 11; on the other hand, this disclosure forms touch-control display composite bed 1 through compounding touch-control layer structure 11 and display layer to make the touch-control layer be located the below of display screen polaroid, thereby reduce the influence to the display effect, and reduce the thickness of flexible screen, further improve the reliability of buckling of flexible screen.

In the following embodiments, an embodiment of the touch layer structure 11 is first explained, and reference is made to an orientation in which the display screen is horizontally placed on a horizontal plane.

Please refer to fig. 1. In this embodiment, the touch layer structure 11 includes an elastic substrate layer 112, and a touch function layer formed on the elastic substrate layer 112; the elastic substrate layer 112 includes a body 1121 and a buffer portion 1122 disposed on the surface of the body 1121, the surface of the buffer portion 1122 includes a buffer surface 1123 connected to the surface of the body 1121, and the buffer surface 1123 forms an included angle with the surface of the body 1121.

The touch function layer is used for realizing a touch function. In one embodiment, the touch function layer includes a transmitting layer 111 and a receiving layer 113. The transmitting layer 111 and the receiving layer 113 may be formed on the same surface of the resilient backing layer 112 or may be formed on both side surfaces of the resilient backing layer 112, respectively. In one example, the transmitting layer 111 is formed on a lower surface of the resilient substrate layer 112 and the receiving layer 113 is formed on an upper surface of the resilient substrate layer 112.

The emitting layer 111 and the receiving layer 113 have touch traces thereon, and specifically, the touch traces may be formed by an ITO (Indium tin oxide) material exposure, development and etching process. In this embodiment, the structure and the form of the touch trace are not limited.

The resilient substrate layer 112 is sandwiched between the transmitting layer 111 and the receiving layer 113, and the resilient substrate layer 112 is generally thicker than the transmitting layer 111 and the receiving layer 113. The elastic backing layer 112 may be made of organic materials, such as one or more of polyurethane-based elastomers, acrylic elastomers, and silicone rubber-based elastomers. When the touch layer structure 11 is bent, the elastic substrate layer 112 has elasticity, so that it can bear fatigue stress, thereby improving the bending reliability of the touch layer structure 11.

In this embodiment, the buffer portion 1122 may be protruded from the surface of the elastic substrate layer 112 or recessed to form a buffer slot. Regardless of whether the buffer 1122 is convex or concave, the transmitting layer 111 and the receiving layer 113 are attached to the surface of the resilient substrate layer 112.

In the present embodiment, the buffer 1122 protrudes from the surface of the elastic backing layer 112. The buffer 1122 may be provided only on the top surface of the elastic substrate layer 112, only on the bottom surface of the elastic substrate layer 112, or, when there are at least two buffer 1122, on both the top and bottom surfaces of the elastic substrate layer 112.

It will be appreciated that the thickness of the resilient substrate layer 112 is not uniform due to the raised buffers 1122 on the surface of the resilient substrate layer 112.

In this embodiment, the surface of the buffering part 1122 includes a buffering surface 1123 connected to the surface of the body 1121, and the buffering surface 1123 forms an included angle with the surface of the body 1121.

Please refer to fig. 1 and fig. 3. When the touch layer structure 11 is bent, the transverse stress can partially offset on the buffer surface 1123, so that the transverse stress is reduced; in the longitudinal direction, the thickness of the elastic substrate layer 112 is not uniform, so that the stress neutral layer is not completely distributed on a certain layer of the touch layer structure 11, but is dispersed on different layers; therefore, when the touch layer structure 11 is bent, the embodiment can avoid the bending failure caused by stress concentration, and improve the bending stability of the touch layer structure 11; on the other hand, the buffer portions 1122 formed in a protruding manner can increase the local thickness of the elastic base layer 112, thereby improving the bending stress resistance.

Further, since the buffer 1122 is provided to protrude from the surface of the body, the contact area between the elastic substrate layer 112 and the transmission layer 111/reception layer 113 is increased, and the connection reliability between the elastic substrate layer 112 and the transmission layer 111/reception layer 113 is increased.

Therefore, the buffer portions 1122 on the touch layer structure 11 of the present embodiment can reduce the increase of stress concentration when bending occurs, thereby improving the bending reliability of the touch layer structure 11.

In order to make the buffer surface 1123 better distribute the stress on the elastic substrate layer 112, in this embodiment, the included angle between the buffer surface 1123 and the surface of the body 1121 is set to be 30 ° to 60 °. For example, the angle between the buffering surface 1123 and the surface of the body 1121 is 45 °, so that the buffering surface 1123 can better distribute the transverse stress and the longitudinal stress, thereby improving the stress dispersion capability.

In the present embodiment, both sides of the buffering portion 1122 are connected to the surface of the body 1121. Therefore, the surface of the cushioning part 1122 includes two cushioning surfaces 1123, and the two cushioning surfaces 1123 are respectively connected to the surfaces of the body 1121 at both sides of the cushioning part 1122; the surface of the cushioning portion 1122 further includes a connecting surface connected between the two cushioning surfaces 1123.

The cushioning surface 1123 may have various patterns according to the specific shape of the cushioning portion 1122. In the present embodiment, since the cushioning portion 1122 has a trapezoidal shape, the cushioning surface 1123 has an inclined surface and the connecting surface has a horizontal surface. The horizontal connecting surface can be conveniently attached to the transmitting layer 111 or the receiving layer 113, so that the connecting stability is improved; and the trapezoidal shaped bumper 1122 extends more smoothly, thereby reducing stress concentrations at the corners. In another embodiment, the buffering portion 1122 has a convex hemispherical shape, so that the buffering surface 1123 and the connecting surface have an arc shape. It is understood that the shape of the cushioning portion 1122 is not limited thereto.

In this embodiment, there are at least two buffer portions 1122, and the at least two buffer portions 1122 include a first buffer portion 1122 and a second buffer portion 1122. The first buffer 1122 is located on a side of the elastic substrate layer 112 facing the emission layer 111, and the emission layer 111 is attached to the surface of the body 1121 and the surface of the first buffer 1122; the second buffer 1122 is located on the side where the elastic substrate layer 112 is attached to the receiving layer 113, and the receiving layer 113 is attached to the surface of the body 1121 and the surface of the second buffer 1122.

Specifically, the first and

second cushioning portions

1122 and 1122 may have the same shape and the same size, and have opposite protruding directions. Of course, the first and

second cushioning portions

1122 and 1122 may have different shapes and different sizes.

In this embodiment, by reasonably setting the relative positions of the first buffer portion 1122 and the second buffer portion 1122, the non-uniformity of the thickness distribution of the elastic substrate layer 112 can be improved, and further, when the touch layer structure 11 is bent, the effect of dispersing the stress is improved.

In a specific embodiment, the first buffering portion 1122 protrudes downward, the second buffering portion 1122 protrudes upward, and the first buffering portion 1122 and the second buffering portion 1122 may be completely staggered. That is, vertically above the first buffer 1122 corresponds to the bulk of the resilient substrate layer 112, and there is no portion corresponding to the second buffer 1122.

In another specific embodiment, the central axis of the first cushioning portion 1122 is not collinear with the central axis of the second cushioning portion 1122. In one example, the first and

second buffering portions

1122 and 1122 are staggered. A portion of the main body and a portion of the second cushioning portion 1122 may correspond to an upper portion of the first cushioning portion 1122. Therefore, the first buffer 1122 and the body, and the second buffer 1122 can be formed to have different thicknesses, and the unevenness of the thickness distribution of the elastic underlying layer 112 can be improved.

Furthermore, in order to improve the overall bending reliability of the elastic substrate layer 112, at least two first buffer portions 1122 are arranged in sequence at intervals; at least two second buffer portions 1122 are arranged in sequence at intervals; the arrangement direction of the first buffers 1122 is the same as the arrangement direction of the second buffers 1122. It is understood that the arrangement direction of the first cushioning portions 1122 and the arrangement direction of the second cushioning portions 1122 correspond to the bending direction of the flexible screen.

In one example, the flexible screen is rectangular, has a length direction and a width direction, and is bendable along the length direction, and the arrangement direction of the first buffer portions 1122 and the corresponding arrangement direction of the second buffer portions 1122 are arranged along the length direction of the flexible screen.

As is clear from the above embodiment, the surface of the elastic pad portion is not completely horizontal because the cushioning portion 1122 is provided in a protruding manner. Since the transmitting layer 111 and the receiving layer 113 are bonded to both sides of the elastic backing layer 112, the surfaces of the transmitting layer 111 and the receiving layer 113 bonded to the elastic backing layer 112 are also uneven.

Thus, in an embodiment, the thickness of the transmitting layer 111 and the receiving layer 113 may be uniform. The emissive layer 111 is illustrated here as an example. The emitting layer 111 has a substantially uniform thickness throughout. Therefore, when the elastic substrate layer 112 has the buffer portion 1122 protruding toward the emitting layer 111, the emitting layer 111 extends along the surface of the buffer portion 1122 to be attached to the outer side of the buffer portion 1122. The extended shape of the emissive layer 111 is thus related to the surface of the elastic substrate layer 112 facing the emissive layer 111. The same is true for the receiving layer 113. Therefore, the upper and lower surfaces of the touch layer structure 11 in this embodiment are not completely horizontal.

In another embodiment, the thickness of the transmitting layer 111 and the receiving layer 113 may be non-uniform. In one example, the resilient substrate layer 112 has a buffer 1122 that is raised toward the emissive layer 111. The thickness of the region of the emission layer 111 corresponding to the buffer 1122 can be set thinner so that the surface of the emission layer 111 on the side facing away from the elastic substrate layer 112 can be horizontal.

In the following embodiments, an embodiment of the touch display composite layer 1 will be explained.

Referring to fig. 1 and fig. 2, in the present embodiment, the touch display composite layer 1 includes a display layer structure 12 and a touch layer structure 11 stacked in sequence; for a specific embodiment of the touch layer structure 11, please refer to the above embodiment, which is not described herein again.

Specifically, the display layer structure 12 in the embodiment is an OLED display layer structure 12, which includes an OLED light emitting layer 122 and a thin film encapsulation layer 121 sequentially stacked, and the thin film encapsulation layer 121 sequentially includes a first inorganic encapsulation layer 1211, an intermediate organic layer 1212, and a second inorganic encapsulation layer 1213 that are stacked. The first inorganic encapsulation layer 1211 is disposed adjacent to the light emitting layer 122.

In fabricating the thin film encapsulation layer 121, the inorganic encapsulation layer may be formed by chemical vapor deposition, and the organic layer may be formed by inkjet printing. The organic layer is coated between the inorganic layers to make the inorganic layer deposition more uniform.

In this embodiment, the touch composite layer further has a substrate under the touch composite layer. The substrate may be formed by laminating hard foam, pet (polyester resin), and copper foil to increase the hardness and scratch resistance of the flexible display screen.

In this embodiment, the touch layer structure 11 is deposited on the second inorganic encapsulation layer 1213 to form the touch display composite layer 1. In the related art, the touch layer and the display layer are two-layer structures, and therefore, a substrate is required to be disposed on each of the touch layer and the display layer. In this embodiment, the touch display composite layer 1 is formed, so that the touch display composite layer and the touch display composite layer can share one substrate, thereby reducing the thickness of the display screen and further improving the bending reliability of the display screen.

In addition, in the related art, the touch layer is located between the polymer protective layer and the polarizer, and therefore a layer of OCA adhesive material needs to be disposed on both the upper and lower surfaces of the touch layer. In this embodiment, by forming the touch display composite layer 1, the number of OCA bonding materials is reduced, so that the thickness of the display screen is further reduced, and the bending reliability of the display screen is improved.

Moreover, the touch layer structure 11 in the touch display composite layer 1 can reduce the increase of stress concentration, and improve the bending reliability of the touch display composite layer 1.

In order to improve the connection stability of the light emitting layer 122 and the first inorganic layer, the light emitting layer 122 is provided with a reinforcing groove 1221. In this embodiment, in order to improve the structural strength of the display touch composite layer, the main body of the elastic substrate layer 112 is disposed to correspond to the reinforcing groove 1221; thereby avoiding the first buffer portion 1122 on the corresponding elastic substrate layer 112 from being bent due to the bending stress concentration caused by the over-thin local package.

In this embodiment, the touch display composite layer 1 further includes an isolation layer 114, and the isolation layer 114 is disposed on a side of the touch layer structure 11 away from the display layer. The isolation layer 114 is used to isolate water and steam. The isolation layer 114 is made of an organic material.

In this embodiment, the touch display composite layer 1 further includes a protective cover plate layer; the protective cover plate layer may be optically adhered to a side of the touch layer structure 11 facing away from the display layer structure 12 by OCA. The protective cover plate layer can increase the hardness of the touch display composite layer 1.

In the following embodiments, embodiments of the flexible screen will be explained.

The flexible screen in this embodiment may only include the touch layer structure 11 in the above embodiment, and may also include the touch display composite layer 1 in the above embodiment. In an embodiment, the touch layer structure 11 in the above embodiments may be further combined with other layer structures to achieve the purposes of flexibly setting the position of the touch layer structure 11 and reducing the thickness of the flexible screen.

In this embodiment, the flexible screen may include the following layer structure from bottom to top. The touch display device comprises a copper foil foam layer, a plastic substrate material layer, an adhesive layer, a touch display composite layer 1, an adhesive layer, a polarizer, an adhesive layer and a polymer protective layer.

It should be noted that the flexible screen layer structure is not limited to the layer types, the number of layers, and the stacking order.

In another embodiment, the touch layer structure 11 in the above embodiments may be combined with other layer structures to achieve the purposes of flexibly setting the position of the touch layer structure 11 and reducing the thickness of the flexible screen.

In the embodiment, an electronic device is also provided. The electronic equipment can be an intelligent terminal and a mobile terminal device. Such as a mobile phone, a Personal Digital Assistant (PDA), an e-book reader, and a smart wearable device.

The electronic equipment is provided with a touch screen or a flexible display screen. The touch screen may include the touch layer structure 11 in the above embodiments, and the flexible display screen may be the flexible display screen in the above embodiments. For specific embodiments of the touch layer structure 11 and the flexible display screen, please refer to the above embodiments, which are not described herein again.

Due to the adoption of the touch layer structure 11 and the touch display composite layer 1 structure in the disclosure, the bending stress of the folding screen is reduced, so that the bending radius of the flexible screen can be reduced, and the bending reliability of the flexible display screen is improved.

While the present disclosure has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present disclosure may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A touch display composite layer is characterized by comprising a display layer structure and a touch layer structure which are sequentially stacked; the touch layer structure comprises an elastic substrate layer and a touch function layer formed on the elastic substrate layer;

2. The touch display composite layer according to claim 1, wherein the buffer portion is protruded from the surface of the body, and the surface of the buffer portion includes two buffer surfaces, and the two buffer surfaces are respectively connected to the surfaces of the body on both sides of the buffer portion;

the surface of buffer portion still includes the connection face, the connection face is connected in two between the buffer face.

3. The touch display composite layer of claim 2, wherein the connecting surface is parallel to the body surface.

4. The touch display composite layer of claim 1, wherein an included angle between the buffer surface and the body surface is 30 ° to 60 °.

5. The touch display composite layer according to claim 1, wherein the touch functional layer includes an emission layer and a receiving layer, and both side surfaces of the elastic substrate layer are respectively attached to the emission layer and the receiving layer.

6. The touch display composite layer according to claim 5, wherein the number of the buffer portions is at least two, and the at least two buffer portions include a first buffer portion and a second buffer portion;

the first buffer part is positioned on one side of the elastic substrate layer facing the emitting layer, and the emitting layer is attached to the surface of the body and the surface of the first buffer part;

the second buffer part is positioned on one side of the elastic substrate layer, which is jointed with the receiving layer, and the receiving layer is jointed with the surface of the body and the surface of the second buffer part.

7. The touch display composite layer according to claim 6, wherein at least two of the first buffer portions are arranged at intervals in sequence; at least two second buffer parts are arranged at intervals in sequence;

the arrangement direction of the first buffer parts is the same as that of the second buffer parts.

8. The touch display composite layer according to claim 6, wherein the first buffer portion corresponds to a portion of a main body, a portion of the second buffer portion, or the first buffer portion corresponds to a portion of the main body at the same time in a lamination direction along the touch layer structure.

9. The touch display composite layer of claim 5, wherein the emission layer is uniform in thickness and has a shape corresponding to a shape of a side of the elastic substrate layer facing the emission layer;

the receiving layer is uniform in thickness and corresponds in shape to the shape of the side of the elastic substrate layer facing the receiving layer.

10. The touch display composite layer of claim 5, wherein the touch layer structure further comprises an isolation layer disposed on a side of the receiving layer facing away from the elastic substrate layer.

11. The touch display composite layer according to any one of claims 1 to 10,

the display layer structure comprises a light emitting layer and a thin film packaging layer which are sequentially stacked, and an emitting layer of the touch layer structure is attached to one side, away from the light emitting layer, of the thin film packaging layer;

the surface of the thin film packaging layer, which is attached to the emitting layer, corresponds to the shape of the emitting layer.

12. The touch display composite layer of claim 11, wherein the light emitting layer has a reinforcing groove thereon, and the main body of the elastic substrate layer corresponds to the reinforcing groove in a stacking direction of the touch display composite layer.

13. The touch display composite layer of claim 11, further comprising a substrate;

the base is arranged on one side, away from the thin film packaging layer, of the light emitting layer, and the substrate is formed by stacking hard foam, PET (Polyethylene terephthalate) and copper foil.

14. The touch display composite layer of claim 11, further comprising a protective cover sheet layer; the protective cover plate layer is arranged on one side, deviating from the display layer structure, of the touch layer structure.

15. A flexible display screen having a touch display composite layer according to any one of claims 1 to 13.

16. An electronic device, comprising the flexible display screen of claim 14.