CN113658512A

CN113658512A - Display panel and preparation method thereof

Info

Publication number: CN113658512A
Application number: CN202110966665.8A
Authority: CN
Inventors: 陈荣坤
Original assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-08-23
Filing date: 2021-08-23
Publication date: 2021-11-16
Anticipated expiration: 2041-08-23
Also published as: CN113658512B

Abstract

The invention provides a display panel and a preparation method thereof, wherein the display panel is a water-drop-shaped flexible display panel and comprises a display module and a back plate positioned at the back of the display module, wherein a flexible layer is arranged between the back plate and the display module, an inward folding area is arranged at the middle position of the display panel, and hollow patterns are arranged on the back plate corresponding to the inward folding area; the display panel is in the regional both sides of enstrophe still the symmetry and sets up the region of enstrophe, and smooth transition between enstrophe region and the region of enstrophe, backplate correspond the region of enstrophe and are provided with the bar recess, and the flexible layer corresponds the bar recess and is provided with the bellying of looks gomphosis, and the bellying is used for filling up the bar recess to this section difference of filling up the groove of backplate, thereby the regional impression's of enstrophe problem is improved to very big degree.

Description

Display panel and preparation method thereof

Technical Field

The invention relates to the technical field of display, in particular to a display panel and a preparation method thereof.

Background

At present, the mainstream drop-shaped OLED folding screen has an inward bending area and an outward bending area in the folding process, blind holes are etched in the inward bending area mostly in the mainstream stainless steel back supporting plate, and the whole vertical bar-shaped half etching is performed in the outward bending area for reducing the SUS modulus. Accordingly, after the upper film is attached, a vertical strip-shaped impression exists in the area between the outer bend and the inner bend, particularly the impression of the outer bend area is obvious, the outer bend area is half etching of the whole vertical strip, a relatively serious vertical strip-shaped impression exists on the front surface of the flexible layer after the flexible layer is attached, and the impression corresponds to the etched area, so that the impression affects the appearance.

Therefore, it is necessary to provide a new display panel and a method for manufacturing the same to solve the above-mentioned problem that the folding screen has vertical bar-shaped impressions in the outer folding area.

Disclosure of Invention

The embodiment of the invention provides a display panel and a preparation method thereof, which can solve the problem that a folding screen in the prior art has vertical bar-shaped marks in an outward folding area.

The embodiment of the invention provides a display panel, which comprises a display module and a back plate positioned at the back of the display module, wherein a flexible layer is arranged between the back plate and the display module, an inward folding area is arranged in the middle of the display panel, and a hollow pattern is arranged on the back plate corresponding to the inward folding area.

The display panel is in the regional both sides of infolding still the symmetry set up the region of turning over outward, the backplate corresponds the region of turning over outward is provided with the bar recess, the flexible layer corresponds the bar recess is provided with the bellying of looks gomphosis, the bellying is used for filling the bar recess.

When the display panel is in a bent state, the inward-folding area is of an outward-convex arc-shaped structure, the outward-folding area is located at two ends of the display panel and is of a concave arc-shaped structure, and the inward-folding area and the outward-folding area are in smooth transition.

According to a preferred embodiment of the present invention, the hardness of the protruding portion is greater than that of the flexible layer, the material of the protruding portion is a pressure sensitive adhesive, and the pressure sensitive adhesive is doped with silicon nitride or silicon oxide particles.

According to a preferred embodiment of the present invention, the contour line of the protruding portion includes two curved side walls disposed oppositely, and the side walls are composed of at least one arc-shaped portion, wherein the bending direction of the arc-shaped portion on one side wall is the same as the bending direction of the corresponding arc-shaped portion on the other side wall.

According to a preferred embodiment of the present invention, the flexible layer is foam, and the material of the foam is one or more of acrylic, hexamethyldisiloxane, polyacrylates, polycarbonates, and polystyrene.

According to a preferred embodiment of the present invention, an optical adhesive layer is further disposed between the flexible layer and the display module, and an optical adhesive layer is also disposed between the flexible layer and the back plate.

According to a preferred embodiment of the present invention, the strip-shaped grooves are distributed in an array manner along a bending direction perpendicular to the bending region, the depth of the strip-shaped grooves is less than one half of the thickness of the back plate, the hollow pattern is in a continuous grid structure, and the strip-shaped grooves are symmetrically arranged on two sides of the hollow pattern.

According to a preferred embodiment of the present invention, the width of the strip-shaped groove is greater than the width of each opening in the hollow-out pattern, and the width of the opening in the hollow-out pattern gradually decreases from the middle position to both sides.

According to a preferred embodiment of the present invention, the back plate is made of stainless steel, and the thickness of the back plate is in a range of 10um to 30 um.

According to a preferred embodiment of the present invention, the display module is an OLED display module or an LED display module.

According to the display panel of the above embodiment, the present invention further provides a method for manufacturing a display panel, the method including:

step S10, providing a back plate, wherein the back plate comprises an inward folding area and outward folding areas located on two sides of the inward folding area, the back plate is provided with hollow patterns corresponding to the inward folding area, and the back plate is provided with strip-shaped grooves corresponding to the outward folding areas.

Step S20, attaching a flexible layer to one side of the back plate groove, where the flexible layer is provided with a protrusion portion corresponding to the groove, and step S20 further includes: step S201, providing a first substrate and a second substrate, coating a layer of wet glue on the first substrate, etching a groove on the second substrate, and depositing a bulge in the groove; step S202, placing the first substrate and the second substrate into an oven, heating to a preset temperature, and preserving heat for a period of time to form the dried flexible layer and the dried convex part; step S203, arranging the first substrate and the second substrate in an involutory manner so that the bulge part is attached to the surface of the flexible layer, and then carrying out foaming treatment on the flexible layer; and step S204, stripping the first substrate and the second substrate to form the required composite structure of the flexible layer and the bulge.

And step S30, attaching a display module to one side of the flexible layer, which is far away from the backboard, so as to finish the preparation of the display panel.

The invention has the beneficial effects that: the embodiment of the invention provides a display panel and a preparation method thereof, wherein the display panel is a water-drop-shaped flexible display panel and comprises a display module and a back plate positioned at the back of the display module, and a flexible layer is arranged between the back plate and the display module, wherein an inward folding area is arranged in the middle of the display panel, and hollow patterns are arranged in the back plate corresponding to the inward folding area; the display panel is in the regional both sides of enstrophe still the symmetry and sets up the region of enstrophe, and smooth transition between enstrophe region and the region of enstrophe, backplate correspond the region of enstrophe and are provided with the bar recess, and the flexible layer corresponds the bar recess and is provided with the bellying of looks gomphosis, and the bellying is used for filling up the bar recess to this section difference of filling up the bar recess department of backplate, thereby greatly the degree improves the problem of the regional impression of enstrophe.

Drawings

In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art flexible layer showing streaking after bending.

Fig. 2 is a schematic view of a bonding structure of a back plate and a flexible layer in the prior art.

Fig. 3 is a schematic view of a folding structure of a display panel according to the present invention.

Fig. 4 is a schematic diagram of a film structure of a display panel according to the present invention.

Fig. 5 is a schematic top view of a back plate according to the present invention.

Fig. 6 is a schematic view of a film structure of a back plate according to the present invention.

FIG. 7 is a schematic view of a process for preparing a flexible layer according to the present invention.

Fig. 8 is a schematic diagram illustrating alignment and attachment of a flexible layer and a backplane according to the present invention.

Detailed Description

The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals, and broken lines in the drawings indicate that the elements do not exist in the structures, and only the shapes and positions of the structures are explained.

As shown in fig. 1 and fig. 2, a flexible layer 14 is attached to the surface of a back plate 10, the back plate 10 is provided with a hollowed-out pattern 11 corresponding to an inward-bending region, the back plate 10 is provided with a groove 12 corresponding to a left-side outward-bending region, the back plate 10 is provided with a groove 13 corresponding to a right-side outward-bending region, in the bending process of the back plate 10, a bulge 15 appears on the surface of the flexible layer 14, which causes the flexible layer 14 to have a relatively serious vertical stripe mark, and the mark corresponds to the region of the groove, and is protruded compared with a half-etched vertical stripe position.

The embodiment of the invention provides a display panel, which is in a water drop shape in a bending state, can effectively relieve folding stress and improve the display quality of the display panel, and comprises a display module and a back plate positioned at the back of the display module, wherein a flexible layer is arranged between the back plate and the display module, and hollow patterns are arranged in a region of the back plate corresponding to an inward folding region; the display panel is also symmetrically provided with outward folding areas at two sides of the inward folding area, the back plate is provided with strip-shaped grooves corresponding to the outward folding areas, the flexible layer is provided with embedded bulges corresponding to the strip-shaped grooves, and the bulges are used for filling the strip-shaped grooves; when the display panel is in a bending state, the inward-folding area is of a convex arc-shaped structure, the outward-folding area is located at two ends of the display panel and is of a concave arc-shaped structure, and the inward-folding area and the outward-folding area are in smooth transition.

Specifically, as shown in fig. 3, the present invention provides a schematic view of a folding structure of a droplet-shaped flexible display panel 100, wherein an inward-folding region 101 is disposed at a middle position of the display panel 100, a first outward-folding region 102 and a second outward-folding region 103 are disposed at two sides of the inward-folding region 101, when the display panel is in a bent state, the inward-folding region 101 is in an outward-convex arc structure, a width of the arc structure is greater than that of other positions, and the display panel is in an arched shape, a first outward-folding region 102 and a second outward-folding region 103 are disposed at two sides of the inward-folding region 101, both the first outward-folding region 102 and the second outward-folding region 103 are in a concave arc structure, the first outward-folding region 102 and the second outward-folding region 103 are also located at two ends of the display panel 100, and the first outward-folding region 102 and the second outward-folding region 103 are preferably symmetrically disposed. Smooth transition is adopted between the inward folding region 101 and the first outward folding region 102 and the second outward folding region 103 respectively, and arc transition is adopted in the embodiment, so that stress concentration can be effectively reduced.

As shown in fig. 4, the present invention provides a schematic diagram of a film structure of a droplet-shaped flexible display panel 100, the display panel 100 includes a display module 108 and a back plate 104 located at the back of the display module 108, a flexible layer 106 is disposed between the back plate 104 and the display module 108, wherein the back plate 104 is provided with a hollow pattern 1041 corresponding to an inflected region 101; the display panel 100 is further symmetrically provided with outward-folding areas at two sides of the inward-folding area 101, the back plate 104 is provided with strip-shaped grooves corresponding to the outward-folding areas, the flexible layer 106 is provided with protrusions which are embedded with each other corresponding to the grooves, and the protrusions are used for filling the strip-shaped grooves.

With reference to fig. 5 and fig. 6, in this embodiment, the back plate 104 is provided with a hollow pattern 1041 corresponding to the inflected region 101, the hollow pattern 1041 is in a continuous grid shape, and the width of the opening in the hollow pattern 1041 preferably decreases gradually from the middle position to both sides, so as to reduce the bending stress. The folding-out region includes a first folding-out region 102 and a second folding-out region 103, a bar-shaped groove 1042 is disposed on the back plate 104 corresponding to the first folding-out region 102, a bar-shaped groove 1043 is disposed on the back plate 104 corresponding to the second folding-out region 103, widths of the bar-shaped groove 1042 and the bar-shaped groove 1043 are preferably greater than a width of each opening in the hollow pattern 1041, and the bar-shaped groove 1042 and the bar-shaped groove 1043 are symmetrically disposed on two sides of the hollow pattern 1041. The strip-

shaped grooves

1042 and 1043 are distributed in an array along the bending direction perpendicular to the bending region, the depth of the strip-shaped grooves is less than half of the thickness of the back plate, the hollowed-out pattern is in a grid structure, and the grooves are symmetrically arranged on two sides of the hollowed-out pattern. The material of backplate is stainless steel sheet material, and stainless steel sheet material's thickness is 10um to 30um within range.

The flexible layer 106 is provided with a protrusion 1061 corresponding to the groove 1042, the flexible layer 106 is provided with a protrusion 1062 corresponding to the strip-shaped groove 1043, the hardness of the protrusion 1061 and the protrusion 1062 is greater than that of the flexible layer 106, the protrusion 1061 and the protrusion 1062 are made of a pressure sensitive adhesive, and silicon nitride or silicon oxide particles are doped in the pressure sensitive adhesive. The material of the raised part in another embodiment is one or more of silicon nitride and silicon oxide. The hardness of the protrusion 1061 and the protrusion 1062 is equal to that of the flexible layer 106, and the same material is used for the flexible layer 106, which is not limited herein.

The cross-sectional shapes of the protruded part 1061 and the protruded part 1062 in the present embodiment are rectangular structures, and the contour lines of the protruded part 1061 and the protruded part 1062 in another embodiment preferably include two curved side walls arranged oppositely, and each side wall is composed of at least one section of arc-shaped part, wherein the bending direction of the arc-shaped part on one side wall is the same as the bending direction of the corresponding arc-shaped part on the other side wall (the specific structure is not shown in the drawings). The adoption of the arc-shaped structure is more favorable for shrinkage, buffering extrusion stress, avoiding stress concentration and being more favorable for eliminating the phenomenon that a vertical bar-shaped impression exists in an outward bending area.

The flexible layer 106 of this embodiment is foam, and the material of the foam is one or more of acrylic, hexamethyldisiloxane, polyacrylates, polycarbonates, and polystyrene. An optical adhesive layer 107 is further disposed between the flexible layer 106 and the display module 108, and an optical adhesive layer 105 is also disposed between the flexible layer 106 and the back plate 104. The display module 108 is preferably an OLED display module LED display module.

Specifically, as shown in FIG. 7, the present invention is described in the form of a drawing for the formation of a flexible layer. Step S201, providing a first substrate 21 and a second substrate 22, coating a layer of wet glue on the first substrate 21, etching left/right grooves on the second substrate 22, and depositing a convex part 1061 in the left groove and a convex part 1062 in the right groove; step S202, placing the first substrate 21 and the second substrate 22 into an oven, heating to a preset temperature, and preserving heat for a period of time to form a dried flexible layer 106, a boss 1061 and a boss 1062; step S203, the first substrate and the second substrate are arranged in an aligned manner so that the protrusion 1061 and the protrusion 1062 are attached to the surface of the flexible layer 106, then the flexible layer 106 is subjected to foaming treatment, and step S204, the first substrate 21 and the second substrate 22 are peeled off, so that a desired combined structure of the flexible layer 106, the protrusion 1061, and the protrusion 1062 is formed.

As shown in fig. 8, an optical adhesive layer 105 is formed on one side of the flexible layer 106 close to the back plate 104, then the flexible layer 106 is aligned with the back plate 104, and then slowly inserted into the back plate 104, so that the

protruding portions

1061 and 1062 are respectively inserted into the bar-

shaped grooves

1042 and 1043.

As shown in fig. 4, after the flexible layer 106 is attached to the back plate 104, an optical adhesive layer 107 is prepared on the surface of the flexible layer 106, and a display module 108 is attached to the optical adhesive layer 107, so as to complete the preparation of the display panel.

The embodiment of the invention provides a display panel and a preparation method thereof, wherein the display panel is a water-drop-shaped flexible display panel and comprises a display module and a back plate positioned at the back of the display module, and a flexible layer is arranged between the back plate and the display module, wherein an inward folding area is arranged in the middle of the display panel, and hollow patterns are arranged in the back plate corresponding to the inward folding area; the display panel is in the regional both sides of enstrophe still the symmetry and sets up the region of enstrophe, and smooth transition between enstrophe region and the region of enstrophe, backplate correspond the region of enstrophe and are provided with the bar recess, and the flexible layer corresponds the bar recess and is provided with the bellying of looks gomphosis, and the bellying is used for filling up the bar recess to this section difference of filling up the groove of backplate, thereby the regional impression's of enstrophe problem is improved to very big degree.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. A display panel is characterized by comprising a display module and a back plate positioned at the back of the display module, wherein a flexible layer is arranged between the back plate and the display module, an inward folding area is arranged in the middle of the display panel, and hollow patterns are arranged on the back plate corresponding to the inward folding area;

the display panel is further symmetrically provided with outward folding areas at two sides of the inward folding area, the back plate is provided with strip-shaped grooves corresponding to the outward folding areas, the flexible layer is provided with embedded bulges corresponding to the strip-shaped grooves, and the bulges are used for filling the strip-shaped grooves;

2. The display panel according to claim 1, wherein the hardness of the protrusion is greater than that of the flexible layer, and the material of the protrusion is a pressure sensitive adhesive doped with silicon nitride or silicon oxide particles.

3. The display panel according to claim 2, wherein the contour of the protrusion includes two curved sidewalls that are oppositely disposed, and the sidewalls are composed of at least one arc-shaped portion, and a bending direction of the arc-shaped portion on one of the sidewalls is the same as a bending direction of the corresponding arc-shaped portion on the other sidewall.

4. The display panel according to claim 1, wherein the flexible layer is foam, and the foam is made of one or more materials selected from acrylic, hexamethyldisiloxane, polyacrylate, polycarbonate, and polystyrene.

5. The display panel of claim 1, wherein an optical adhesive layer is disposed between the flexible layer and the display module, and an optical adhesive layer is disposed between the flexible layer and the back plate.

6. The display panel according to claim 1, wherein the bar-shaped grooves are distributed in an array along a bending direction perpendicular to the bending region, the depth of the bar-shaped grooves is less than half of the thickness of the back plate, the hollow pattern is in a continuous grid structure, and the bar-shaped grooves are symmetrically arranged on two sides of the hollow pattern.

7. The display panel according to claim 6, wherein the width of the bar-shaped groove is greater than the width of each opening in the hollow pattern, and the width of each opening in the hollow pattern gradually decreases from the middle position to two sides.

8. The display panel of claim 1, wherein the material of the back plate is stainless steel plate, and the thickness of the back plate is in a range of 10um to 30 um.

9. The display panel of claim 1, wherein the display module is an OLED display module or an LED display module.

10. A method for manufacturing a display panel, the method comprising:

step S10, providing a back plate, wherein the back plate comprises an inward folding area and outward folding areas positioned at two sides of the inward folding area, the back plate is provided with hollow patterns corresponding to the inward folding area, and the back plate is provided with strip-shaped grooves corresponding to the outward folding areas;

step S20, attaching a flexible layer to one side of the back plate groove, where the flexible layer is provided with a protrusion portion corresponding to the groove, and step S20 further includes: step S201, providing a first substrate and a second substrate, coating a layer of wet glue on the first substrate, etching a groove on the second substrate, and depositing a bulge in the groove; step S202, placing the first substrate and the second substrate into an oven, heating to a preset temperature, and preserving heat for a period of time to form the dried flexible layer and the dried convex part; step S203, arranging the first substrate and the second substrate in an involutory manner so that the bulge part is attached to the surface of the flexible layer, and then carrying out foaming treatment on the flexible layer; step S204, stripping the first substrate and the second substrate to form a required composite structure of the flexible layer and the bulge;