CN111785175A - Flexible display module, under-screen fingerprint display device and manufacturing method - Google Patents
Flexible display module, under-screen fingerprint display device and manufacturing method Download PDFInfo
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- CN111785175A CN111785175A CN202010801193.6A CN202010801193A CN111785175A CN 111785175 A CN111785175 A CN 111785175A CN 202010801193 A CN202010801193 A CN 202010801193A CN 111785175 A CN111785175 A CN 111785175A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20954—Modifications to facilitate cooling, ventilating, or heating for display panels
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Abstract
The invention discloses a flexible display module, an under-screen fingerprint display device and a manufacturing method, wherein the flexible display module comprises a display panel, a heat dissipation film and a shading adhesive tape, the heat dissipation film comprises a first film layer, a second film layer and a protective film layer which are sequentially stacked on the far side of the display panel away from the light emergent side, the first film layer comprises a first opening penetrating through the first film layer, and the first opening corresponds to a sensing area of a fingerprint identification module to be mounted of the flexible display module; the second film layer comprises a second opening penetrating through the second film layer, the second opening and the first opening are correspondingly arranged to expose the sensing area of the fingerprint identification module to be installed, and the aperture of the second opening is larger than that of the first opening; a protective film layer covering the second film layer; and the shading adhesive tape is arranged on one side, close to the display panel, of the protective film layer and is positioned in the second opening, and the orthographic projection of the shading adhesive tape on the display panel covers the orthographic projection of the first opening on the display panel. The invention can effectively reduce the die marks at the open holes of the display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display module, a finger print display device under a screen and a manufacturing method.
Background
At present, the fingerprint has wide application in flexible display module assembly under the screen, and among the prior art, this design need be at the radiating film trompil through-hole, and the through-hole top sets up black shading sticky tape usually in order to protect the display panel part that does not have the radiating film to eliminate the through-hole that display panel corresponds and form the display effect difference owing to do not have the radiating film to shelter from and contact the position of environment light and the through-hole around not having the position of contact environment light, cause and show badly. However, the stress at the opening is too large due to the design of the through hole of the heat dissipation film, and the shading tape and the heat dissipation film have a step difference at the position, so that the shading tape can generate a large pressure on the position when the heat dissipation film is attached, the stress at the position is further increased, the back of the display panel is subjected to unreleasable stress, and the fingerprint hole die print is generated at the opening of the display panel, and the front of the display panel is shaded.
Disclosure of Invention
In order to solve at least one of the above problems, a first embodiment of the present invention provides a flexible display module,
the method comprises the following steps:
display panel, heat dissipation membrane and shading sticky tape, the heat dissipation membrane is including range upon range of setting in proper order first rete, second rete and the protection rete that display panel kept away from the light-emitting side, wherein
The first film layer comprises a first opening penetrating through the first film layer, and the first opening corresponds to a sensing area of a fingerprint identification module to be mounted on the flexible display module;
the second film layer comprises a second opening penetrating through the second film layer, the second opening and the first opening are correspondingly arranged to expose the sensing area of the fingerprint identification module to be installed, and the aperture of the second opening is larger than that of the first opening;
the protective film layer covers the second film layer;
the shading adhesive tape is arranged on one side, close to the display panel, of the protective film layer and is positioned in the second opening, and the orthographic projection of the shading adhesive tape on the display panel covers the orthographic projection of the first opening on the display panel.
Further, the center point of the orthographic projection of the first opening on the display panel and the center point of the orthographic projection of the second opening on the display panel coincide.
Further, the orthographic projection of the first opening on the display panel, the orthographic projection of the second opening on the display panel and the orthographic projection of the shading adhesive tape on the display panel are axially symmetrical along a first direction;
and/or
The orthographic projection of the first opening on the display panel, the orthographic projection of the second opening on the display panel and the orthographic projection of the shading adhesive tape on the display panel are axially symmetrical along a second direction.
Further, the first film layer comprises a grid glue layer and a foam layer which are sequentially stacked on the side, far away from the light emergent side, of the display panel, the first opening comprises a first through hole penetrating through the grid glue layer and a second through hole penetrating through the foam layer, the aperture of the second through hole is larger than that of the first through hole, and the aperture of the second through hole is smaller than that of the second opening;
and/or
The second rete is including range upon range of setting in proper order keeping away from the polyimide layer and the copper foil layer of display panel in the first rete, the second trompil is including the third through-hole that link up the polyimide layer and link up the fourth through-hole of copper foil layer, the aperture of fourth through-hole is greater than the aperture of third through-hole, and the aperture of third through-hole is greater than the aperture of first trompil.
Furthermore, the display panel comprises a non-bending display area and at least one bending display area, and a plurality of slots penetrating through the second film layer of the heat dissipation film are arranged corresponding to the bending display areas.
Further, the plurality of slots are regularly arranged oval slots or prismatic slots.
A second embodiment of the present invention provides an off-screen fingerprint display device, including a display panel, a heat dissipation film and a fingerprint identification module, where the heat dissipation film includes a first film layer and a second film layer sequentially stacked on the light exit side of the display panel, where the first film layer and the second film layer are disposed on the light exit side of the display panel, and the first film layer and the second film layer are disposed on the light exit side of the display panel
The first film layer comprises a first opening penetrating through the first film layer, and the first opening corresponds to the sensing area of the fingerprint identification module;
the second film layer comprises a second opening penetrating through the second film layer, the second opening and the first opening are correspondingly arranged to expose the sensing area of the fingerprint identification module, and the aperture of the second opening is larger than that of the first opening;
the fingerprint identification module is arranged in the first opening and the second opening.
A third embodiment of the present invention provides a method for manufacturing the flexible display module, including:
adhering a first film layer to one side of the display panel, which is far away from the light emergent side, wherein the first film layer comprises a first opening penetrating through the first film layer, and the first opening corresponds to an induction area of a fingerprint identification module to be installed on the flexible display module;
adhering the second film layer to one side, far away from the display panel, of the first film layer, wherein the second film layer comprises a second opening hole penetrating through the second film layer, the second opening hole and the first opening hole are correspondingly arranged to expose a sensing area of the fingerprint identification module to be installed, and the aperture of the second opening hole is larger than that of the first opening hole;
and adhering the protective film layer to one side of the second film layer, which is far away from the display panel, wherein one side of the protective film layer, which is close to the display panel, is provided with a shading adhesive tape, the shading adhesive tape is positioned in the second opening, and the orthographic projection of the shading adhesive tape on the display panel covers the orthographic projection of the first opening on the display panel.
Further, the display panel includes a non-bending display area and at least one bending display area, and the adhering the second film layer to the first film layer on the side away from the display panel further includes:
the second film layer is provided with a plurality of slots penetrating through the second film layer corresponding to the bending display areas, and the slots are oval slots or rhombic slots.
A fourth embodiment of the present invention provides a method for manufacturing an underscreen fingerprint display device, including:
forming the flexible display module;
peeling off a protective film layer of a heat dissipation film of the flexible display module and a shading adhesive tape arranged on the protective film layer;
install fingerprint identification module in the first trompil and the second trompil of flexible display module's radiating film, fingerprint identification module's induction zone sees through second trompil and first trompil expose.
The invention has the following beneficial effects:
aiming at the existing problems, the invention provides a flexible display module, a fingerprint display device under a screen and a manufacturing method, through respectively arranging through holes with different apertures on a first film layer and a second film layer of a heat dissipation film to form a first opening and a second opening for installing a fingerprint identification module, wherein the aperture of the second opening arranged on the second film layer is larger than that of the first opening arranged on the first film layer, so that the first film layer can provide support for the opening of the second film layer arranged on the first film layer, and the stress at the boundary of the second opening of the second film layer is reduced; and the shading adhesive tape is arranged on one side of the protective film layer, which is close to the display panel, and is positioned in the second opening, so that the section difference of the original shading adhesive tape arranged on one side of the protective film layer, which is far away from the display panel, is eliminated, the pasting force can be uniformly applied to the heat dissipation film, the stress of the opening in the module manufacturing process is further reduced, the die mark of the opening of the display panel is effectively reduced, the problems in the prior art are solved, and the shading adhesive tape has a wide application prospect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;
FIG. 1a is a schematic diagram illustrating a heat dissipation film and a through hole of a flexible display module according to the prior art;
FIG. 1b is a schematic structural diagram of a heat dissipation film and a light-shielding tape of a flexible display module in the prior art;
FIG. 2 is a schematic structural diagram of a flexible display module in the prior art;
FIG. 3 is a diagram illustrating a stress analysis of a display panel of a flexible display module during application of a heat dissipation film in the prior art;
fig. 4 is a schematic structural diagram of a flexible display module according to an embodiment of the present invention;
FIG. 5 is a schematic view of a projection of the first opening, the second opening and the light blocking tape onto a display panel according to an embodiment of the invention;
FIG. 6 is a diagram illustrating a stress analysis of a display panel with a heat dissipation film applied thereon according to an embodiment of the present invention;
figure 7a shows a schematic cross-sectional view of a large-angle bend CG according to an embodiment of the present invention;
FIG. 7b is a schematic cross-sectional view illustrating a poor warping of the heat dissipation film according to an embodiment of the present invention;
FIGS. 8a-8b are schematic views illustrating a structure of a heat dissipation film according to an embodiment of the invention, in which a plurality of grooves are formed on a second film layer;
FIG. 9 is a flow chart illustrating a process for fabricating a flexible display module according to an embodiment of the invention;
FIG. 10 is a flow chart illustrating a process for manufacturing an underscreen fingerprint display device according to an embodiment of the invention;
FIG. 11 is a schematic diagram of an arrangement of an underscreen fingerprint display device according to an embodiment of the invention;
fig. 12 is a schematic structural diagram of a flexible display module according to another embodiment of the invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
It is noted that references herein to "on … …", "formed on … …" and "disposed on … …" can mean that one layer is formed or disposed directly on another layer or that one layer is formed or disposed indirectly on another layer, i.e., there is another layer between the two layers. As used herein, unless otherwise specified, the term "on the same layer" means that two layers, components, members, elements or portions can be formed by the same patterning process, and the two layers, components, members, elements or portions are generally formed of the same material. Herein, unless otherwise specified, the expression "patterning process" generally includes the steps of coating of photoresist, exposure, development, etching, stripping of photoresist, and the like. The expression "one-time patterning process" means a process of forming a patterned layer, member, or the like using one mask plate.
As shown in fig. 1a and 1b, in the prior art, a through hole for installing a fingerprint recognition module is generally formed on a heat dissipation film 12 ', and a light shielding tape 13 ' is attached to a position of a heat dissipation film protection film layer 123 ' corresponding to the through hole to prevent a display panel corresponding to the through hole from contacting ambient light. The schematic cross-sectional view of the heat dissipating film at the position of the opening is shown in fig. 2, and during the manufacturing process, the light-shielding tape 13 'at the position of the opening has a height difference with the heat dissipating film protection film 123', which causes a large stress at the position when the heat dissipating film is attached. Fig. 3 is a schematic diagram showing stress of each film layer under uniform adhesion force when the heat dissipation film is adhered, because there is a step difference between the light-shielding tape 13 'and the protective film layer 123', the uniform adhesion force on the surface is transmitted to each film layer of the heat dissipation film, the stress of each film layer is the largest at the boundary of the opening of each film layer, and the stress generated by the light-shielding tape 13 'under the adhesion force is also concentrated to the opening area of the display panel 11' to form a stamp; and when the attaching force is applied, the foam layer 1213 'of the heat dissipation film generates a resilient force for providing support as shown in fig. 3, but the resilient force is minimal at the boundary of the opening, so that the stress of the display panel 11' is maximal and most concentrated at the position of the opening, and the stamping of the display panel at the area of the opening is further increased.
Therefore, the inventor proposes a flexible display module, an under-screen fingerprint display device and a manufacturing method to solve the above problems.
As shown in fig. 4, an embodiment of the present invention provides a flexible display module 10, which includes a display panel 11, a heat dissipation film 12 and a light shielding tape 13, wherein the heat dissipation film 12 includes a first film layer 121, a second film layer 122 and a protection film layer 123 sequentially stacked on a light emitting side of the display panel 11, wherein,
the first film layer 121 includes a first opening 1211 penetrating therethrough, and the first opening 1211 corresponds to a sensing area of a fingerprint identification module to be mounted on the flexible display module;
the second film layer 122 includes a second opening 1221 penetrating therethrough, the second opening 1221 is disposed corresponding to the first opening 1211 to expose the sensing area of the fingerprint identification module to be mounted, and an aperture of the second opening is larger than an aperture of the first opening;
the protective film layer 123 covers the second film layer 122;
the light shielding tape 13 is disposed on one side of the protective film layer 123 close to the display panel 11 and located in the second opening 1221, and an orthogonal projection of the light shielding tape 13 on the display panel 11 covers an orthogonal projection of the first opening 1211 on the display panel.
In this embodiment, the first film layer 121 and the second film layer 122 of the heat dissipation film are respectively provided with through holes with different apertures to form a first opening 1211 and a second opening 1221 for installing the fingerprint identification module, and the second opening 1221 provided in the second film layer 122 has an aperture larger than that of the first opening 1211 provided in the first film layer 121, so that the first film layer 121 can provide film layer support for the opening of the second film layer 122 provided thereon, thereby reducing the stress at the boundary of the second opening 1221 of the second film layer 122; and set up shading sticky tape 13 and be located second trompil 1221 in protective film layer 123 is close to display panel 11 one side, thereby eliminate among the prior art because of the poor problem of section that shading sticky tape setting leads to keeping away from display panel one side, make and paste the power and evenly apply on the heat dissipation membrane, effectively reduce the stress of the trompil department in the module manufacture process, thereby reduce the stamp of display panel trompil department, remedied the problem that exists among the prior art, have extensive application prospect.
In one embodiment, the steps for fabricating the flexible display module are described as follows:
in a first step, a first position corresponding to a sensing area of a fingerprint recognition module to be mounted on the flexible display module is determined on the first film 121, and a first opening 1211 is formed at the first position.
In a second step, a second position corresponding to the first opening 1211 and capable of exposing the sensing area of the fingerprint recognition module to be installed is determined on the second film 122, and a second opening 1221 is formed at the second position.
In an alternative embodiment, the center point of the orthographic projection of the first opening 1211 on the display panel and the center point of the orthographic projection of the second opening 1221 on the display panel coincide.
In this embodiment, first trompil and second trompil all are located the position that corresponds with fingerprint identification module's induction zone to realize fingerprint identification module's effective installation, and first trompil is in orthographic projection's on the display panel center and second trompil are in the center of orthographic projection on the display panel sets up with one heart, and the mode that sets up of this concentric trompil can realize that each rete atress of heat dissipation membrane is balanced, reduces the stamp quantity. It should be noted that, the shapes of the first opening and the second opening are not limited in the present application, and may be circular, rectangular or other shapes, and the design criteria of balancing the stress of each film layer is not repeated herein.
Third, a third position corresponding to the second opening 1221 and the first opening 1211 is determined on the protective film layer 123 and a light-shielding tape is disposed on the third position.
In this embodiment, the light-shielding tape is disposed on one side of the protective film layer close to the display panel and in the second opening, so that on one hand, the problem of a step difference caused by the light-shielding tape disposed on the protective film layer in the prior art is solved; on the other hand, utilize the first trompil and the second trompil in different apertures, set up the shading sticky tape in the second trompil, and the orthographic projection of shading sticky tape on display panel covers the orthographic projection of first trompil on display panel to realize the shading effect of shading sticky tape to the display panel that first trompil position corresponds, avoid leading to showing inhomogeneous problem because of display panel part position contact environment light, effectively improve user experience.
In order to further equalize the stress experienced by the display panel, in an alternative embodiment, the orthographic projection of the first opening 1211 on the display panel, the orthographic projection of the second opening 1221 on the display panel, and the orthographic projection of the masking tape 13 on the display panel 11 are axisymmetric along the first direction.
In this embodiment, as shown in fig. 5, a top view of the positions of the first opening 1211 and the second opening 1221 on the display panel is shown, the first direction is a horizontal direction X thereof, and the second direction is a Y direction perpendicular to the first direction X. As shown in fig. 5, the orthographic projections of the first opening 1211, the second opening 1221 and the light-shielding tape 13 on the display panel are all symmetrical along the axis X' of the first direction, so that the symmetrical arrangement of the first opening, the second opening and the light-shielding tape can further realize the stress balance of each film layer of the heat dissipation film, and reduce the number of the die marks.
Similarly, in another alternative embodiment, the orthographic projection of the first opening 1211 on the display panel, the orthographic projection of the second opening 1221 on the display panel and the orthographic projection of the masking tape 13 on the display panel are symmetrical along the second direction Y axis.
In this embodiment, as shown in fig. 5, the orthographic projections of the first opening 1211, the second opening 1221 and the light-shielding tape 13 on the display panel are all symmetric along the axis Y' of the second direction, so that the symmetric arrangement of the first opening, the second opening and the light-shielding tape can further achieve the stress balance of each layer of the heat dissipation film, and reduce the number of the die prints.
It should be noted that the orthographic projections of the first opening 1211, the second opening 1221 and the light-shielding tape 13 on the display panel may be set to be axisymmetric only along the first direction as shown in fig. 5, may also be axisymmetric only along the second direction as shown in fig. 5, and may also be set to be axisymmetric along the first direction and the second direction simultaneously to realize the center concentric arrangement of the orthographic projections of the first opening 1211, the second opening 1221 and the light-shielding tape 13, which should be designed by a person skilled in the art according to practical application requirements to realize the balanced stress of each film layer of the heat dissipation film, and will not be described herein again.
Fourthly, the first film layer 121 is adhered to the side of the display panel 11 far away from the light emitting side.
Fifthly, the second film layer 122 is pasted on the side of the first film layer 121 far away from the display panel 11.
Sixthly, the protective film 123 is pasted on one side of the second film 122 far away from the display panel 11, the orthographic projection of the second opening 1221 on the display panel 11 covers the orthographic projection of the light shielding tape 13 on the display panel 11, and the orthographic projection of the light shielding tape 13 on the display panel 11 covers the orthographic projection of the first opening 1211 on the display panel 11.
Forming the flexible display module shown in fig. 4, attaching a light-shielding tape on the side of the protective film layer away from the display panel, compared to the flexible display module in the prior art shown in fig. 2, and performing stress analysis shown in fig. 3; similarly, as shown in fig. 6, in the embodiment, the display module of the present embodiment is subjected to stress analysis, in the embodiment, the light-shielding tape 13 is attached to the side of the protective film layer 123 close to the display panel, so that the plane of the side of the protective film layer 123 far from the display panel 11 is smooth, and when the heat dissipation film is attached, the attaching force can be uniformly applied to the protective film layer 123, thereby eliminating the stress generated at the opening by the attaching mode of the original light-shielding tape. In addition, in this embodiment, the aperture of the second opening 1221 is larger than the aperture of the first opening 1211, and the first film layer 121 can provide a resilient support for the boundary of the second opening 1221 of the second film layer 122, thereby reducing the concentrated stress at the opening boundary caused by the same boundary between the second opening and the first opening of the original flexible display module, and further reducing the stress concentration at the opening of the display panel, thereby effectively reducing the fingerprint imprint at the opening of the display panel.
Therefore, this embodiment through with shading sticky tape paste cover in the protection rete is close to display panel one side for the power of pasting when the heat dissipation membrane is pasted can evenly be exerted on the protection rete, sets up the aperture of the second trompil that the second rete was seted up to be greater than the first aperture that first rete was seted up, can reduce the stress concentration of display panel in trompil department, consequently can effectively reduce the fingerprint seal of display panel trompil department.
In view of further reducing the stress borne by the display panel, in an alternative embodiment, as shown in fig. 12, the first film layer 121 includes a mesh adhesive layer 1212 and a foam layer 1213 sequentially stacked on the light-emitting side of the display panel 11, the first opening includes a first through hole penetrating through the mesh adhesive layer and a second through hole penetrating through the foam layer, the aperture of the second through hole is larger than that of the first through hole, and the aperture of the second through hole is smaller than that of the second opening.
In this embodiment, further provide the boundary support for the second trompil through setting up the gradually crescent first through-hole in aperture and second through-hole respectively, it is specific, set up first through-hole at net glue film 1212, set up the second through-hole at bubble cotton layer 1213, and the aperture of second through-hole is greater than the aperture of first through-hole, then net glue film 1212 can provide the support for the through-hole boundary that sets up the second through-hole at bubble cotton layer 1213, has reduced the stress concentration on second through-hole and first through-hole boundary, further reduces the stress that display panel bore, can effectively reduce the die-stamping of display panel in through-hole department.
Specifically, a fifth position corresponding to a sensing area of a fingerprint identification module to be mounted on the flexible display module is determined on the grid adhesive layer, and a first through hole penetrating through the grid adhesive layer is formed in the fifth position;
determining a sixth position corresponding to the fifth position on the foam layer, and forming a second through hole penetrating through the foam layer on the sixth position;
pasting the foam layer 1213 on one side of the grid adhesive layer 1212, which is far from the display panel 11, wherein the orthographic projection of the second through hole on the display panel covers the orthographic projection of the first through hole on the display panel, and the orthographic projection of the second through hole on the display panel covers the orthographic projection of the second through hole on the display panel.
Similarly, in another alternative embodiment, as shown in fig. 12, the second film layer 122 includes a polyimide layer 1222 and a copper foil layer 1223 stacked in sequence on the first film layer 121 away from the display panel 11, the second opening includes a third through hole penetrating through the polyimide layer and a fourth through hole penetrating through the copper foil layer, an aperture of the fourth through hole is larger than an aperture of the third through hole, and an aperture of the third through hole is larger than an aperture of the first opening.
In this embodiment, through the third through hole and the fourth through hole with gradually increasing diameters, the polyimide layer can form a support for the through hole boundary of the fourth through hole formed in the copper foil layer, so that the stress concentration on the boundary of the third through hole and the fourth through hole is reduced, the stress borne by the display panel is further reduced, and the stamping of the display panel at the through hole can be effectively reduced.
Specifically, a seventh position corresponding to the first opening and capable of exposing the sensing area of the fingerprint identification module to be installed is determined on the polyimide layer, and a third through hole penetrating through the polyimide layer is formed in the seventh position;
determining an eighth position corresponding to the seventh position on the copper foil layer, and forming a fourth through hole penetrating through the copper foil layer on the eighth position;
and pasting the polyimide layer on one side of the foam layer far away from the display panel, covering the orthographic projection of the second opening on the display panel by the orthographic projection of the third through hole, and covering the orthographic projection of the third through hole on the display panel by the orthographic projection of the fourth through hole on the display panel.
The person skilled in the art can only adopt the first film layer opening mode of sequentially forming the first through hole and the second through hole with the gradually increased aperture on the grid glue layer and the foam layer, can also only adopt the second film layer opening mode of sequentially forming the third through hole and the fourth through hole with the gradually increased aperture on the polyimide layer and the copper foil layer, and can also adopt the two film layer opening modes to form the through hole design of gradually increased aperture from the first through hole of the grid glue layer to the fourth through hole of the copper foil layer. Those skilled in the art should design according to practical applications to realize that each film layer of the heat dissipation film can provide support for another film layer disposed thereon at the position where the stress at the boundary of the through hole is maximum, and details are not repeated herein.
It should be noted that, considering the mesh glue layer and the foam layer of the first film layer, a gradual stepped opening is formed with the second opening of the second film layer, in this embodiment, the aperture of the first opening is the aperture of the first through hole of the mesh glue layer; the aperture of the second opening is the aperture of the third through hole of the polyimide layer, that is, when the grid glue layer, the foam layer, the polyimide layer and the copper foil layer form a stepped opening, the aperture of the through hole of each film layer is increased along the direction from the near to the far away from the display panel.
On the other hand, the demand for bending the flexible display module and the Cover plate (CG) matching the flexible display module at a large angle is more and more strong, and the flexible display module with a bending angle larger than 90 ° has been proposed in the market, so that it has a very high requirement for the attachment stability of the heat dissipation film 12 attached on the display panel 11. The schematic cross-sectional view of a large-angle bent CG (bending angle > 70 °) is shown in fig. 7a, the CG30 covers the flexible display module, the heat dissipation film 12 is tightly attached to the display panel 11 and bent along with the bending of the CG, however, the heat dissipation film at the bent position tends to return to a flat state after being attached or after being attached and standing, and the heat dissipation film as shown in fig. 7b is tilted, and under the high-temperature and high-humidity reliability condition, the tilting phenomenon is aggravated, and the product quality of the display module is seriously affected. In order to solve the problem, the inventor proposes after a large number of experiments that when the heat dissipation film is in a large-angle bending condition, the heat dissipation film 12 is close to the outer circle of the CG side as a bending arc, and is far away from the inner circle of the CG side as a bending arc, the heat dissipation film 12 in the inner circle can generate material accumulation under the condition of the same length, and further generate internal stress, and the stress received by the heat dissipation film 12 in the bending area is the largest, and the stress can cause the heat dissipation film in the bending area originally attached to the display panel 11 to tilt, and the phenomenon of tilting of the bending area as shown in fig. 7b occurs. Therefore, in an optional embodiment, the display panel includes a non-bending display region and at least one bending display region, and the second film layer of the heat dissipation film is provided with a plurality of slots penetrating through the second film layer corresponding to each bending display region.
Specifically, as shown in fig. 8a, the plurality of slots 1230 are oval slots regularly arranged. As shown in fig. 8b, the plurality of slots 1230 are regularly arranged prismatic slots. It is worth noting that the specific groove shape is not specifically limited in the present application, and those skilled in the art select a proper groove shape according to the actual application requirement to avoid the heat dissipation film from being tilted in the bending region under the high temperature and high humidity condition as the design criteria, which is not described herein again.
In this embodiment, the maximum stress position of the bending region of the heat dissipation film is provided with the slot, so that the bending stress of the film material in the original bending region is reduced, and the tilting of the heat dissipation film in the bending region can be effectively avoided.
Specifically, in the process of manufacturing the flexible display module, confirm on the second rete with what first trompil corresponds can expose the second position of waiting the induction zone of installed fingerprint identification module, and form the second trompil in the second position and still include:
determining a plurality of fourth positions corresponding to the bent display areas on the second film layer and forming a slot at each fourth position, wherein the slot is an oval slot or a rhombic slot.
That is, the second opening and the plurality of slots formed in the second film layer can be formed in the same manufacturing process, i.e., the patterning of the second opening and the plurality of slots can be completed by the same manufacturing step, thereby effectively simplifying the process flow.
It should be noted that, in the present application, the position and the number of the bending regions of the flexible display module are not specifically limited, and those skilled in the art should set the bending regions according to the actual application condition to meet the requirement of slotting at the maximum stress position of the bending region as the design criterion, which is not described herein again.
It should be noted that the positional relationship between the heat dissipation film 12 and the display panel 11 shown in fig. 7a and 7b is a placement manner when the actual flexible display module is used, and the positional relationship between the heat dissipation film 11 and the display panel 11 shown in fig. 2 and 4 is a processing placement manner when the heat dissipation film is attached, that is, no matter which placement manner is adopted, the mesh adhesive layer in the first film layer of the heat dissipation film is always attached to the display panel.
Corresponding to the flexible display module provided in the foregoing embodiments, an embodiment of the present application further provides a manufacturing method for manufacturing the flexible display module, and since the manufacturing method provided in the embodiment of the present application corresponds to the flexible display modules provided in the foregoing embodiments, the foregoing embodiment is also applicable to the manufacturing method provided in the embodiment, and is not described in detail in the embodiment.
As shown in fig. 9, an embodiment of the present application further provides a manufacturing method for manufacturing the flexible display module, including
Adhering a first film layer to one side of the display panel, which is far away from the light emergent side, wherein the first film layer comprises a first opening penetrating through the first film layer, and the first opening corresponds to an induction area of a fingerprint identification module to be installed on the flexible display module;
adhering the second film layer to one side, far away from the display panel, of the first film layer, wherein the second film layer comprises a second opening hole penetrating through the second film layer, the second opening hole and the first opening hole are correspondingly arranged to expose a sensing area of the fingerprint identification module to be installed, and the aperture of the second opening hole is larger than that of the first opening hole;
and adhering the protective film layer to one side of the second film layer, which is far away from the display panel, wherein one side of the protective film layer, which is close to the display panel, is provided with a shading adhesive tape, the shading adhesive tape is positioned in the second opening, and the orthographic projection of the shading adhesive tape on the display panel covers the orthographic projection of the first opening on the display panel.
In this embodiment, through holes with different apertures are respectively formed in the first film layer and the second film layer of the heat dissipation film to form a first opening and a second opening for installing the fingerprint identification module, and the aperture of the second opening is larger than that of the first opening, after the first film layer and the second film layer are matched and adhered, the first film layer can provide film layer support for the opening of the second film layer arranged on the first film layer, so that the stress at the boundary of the second opening of the second film layer is reduced; and set up shading sticky tape in that the protective film layer is close to display panel one side and be located the second trompil, eliminate among the prior art because of the poor problem of section that shading sticky tape setting leads to keeping away from display panel one side for paste the power and evenly apply on the heat dissipation membrane, further reduce the stress of trompil department in the module manufacture process, thereby reduce the stamp of display panel trompil department effectively, remedied the problem that exists among the prior art, extensive application prospect has. For the specific implementation of this embodiment, reference is made to the foregoing embodiments, which are not described herein again.
In an optional embodiment, the display panel includes a non-bending display region and at least one bending display region, and the adhering the second film layer to the first film layer on the side away from the display panel further includes:
the second film layer is provided with a plurality of slots penetrating through the second film layer corresponding to the bending display areas, and the slots are oval slots or rhombic slots.
In this embodiment, the maximum stress position of the bending region of the heat dissipation film is provided with the slot, so that the bending stress of the film material in the original bending region is reduced, and the tilting of the heat dissipation film in the bending region can be effectively avoided. For the specific implementation of this embodiment, reference is made to the foregoing embodiments, which are not described herein again.
Based on the flexible display module and the method for manufacturing the flexible display module, as shown in fig. 10, an embodiment of the present application further provides a method for manufacturing a device for displaying fingerprints under a screen, including:
forming the flexible display module;
peeling off a protective film layer of a heat dissipation film of the flexible display module and a shading adhesive tape arranged on the protective film layer;
install fingerprint identification module in the first trompil and the second trompil of flexible display module's radiating film, fingerprint identification module's induction zone sees through second trompil and first trompil expose.
In this embodiment, at first peel off the protection film layer of heat dissipation membrane and the shading sticky tape that sets up on the protection film layer and expose first trompil and second trompil, let the back install the fingerprint identification module in the first trompil and the second trompil of flexible display module's heat dissipation membrane, the induction zone of fingerprint identification module sees through second trompil and first trompil expose to form the fingerprint display device under the screen that has the fingerprint identification function, follow-up preparation method is with prior art, and it is no longer repeated here.
According to the manufacturing method of the under-screen fingerprint display device, those skilled in the art can understand that the under-screen fingerprint display device is also within the protection scope of the present application. As shown in fig. 11, an embodiment of the present application provides an off-screen fingerprint display device 20, which includes a display panel 11, a heat dissipation film 12 and a fingerprint identification module 21, the heat dissipation film 12 includes a first film layer 121 and a second film layer 122 stacked in sequence and disposed on the light exit side of the display panel 11, wherein the first film layer 121 and the second film layer 122 are far away from the light exit side of the display panel 11, and the first film layer and the second film layer are stacked in sequence
The first film 121 includes a first opening 1211 penetrating therethrough, the first opening 1211 corresponds to the sensing area of the fingerprint identification module 21;
the second film 122 includes a second opening 1221 penetrating therethrough, the second opening 1221 is disposed corresponding to the first opening 1211 to expose the sensing area of the fingerprint identification module 21, and an aperture of the second opening 1221 is larger than an aperture of the first opening 1211;
the fingerprint recognition module 21 is disposed in the first opening 1211 and the second opening 1221.
In this embodiment, fingerprint identification module sets up in corresponding first trompil and second trompil, fingerprint identification module's induction zone sees through second trompil and first trompil expose to form fingerprint display device under the screen that has fingerprint identification function. For the specific implementation of this embodiment, reference is made to the foregoing embodiments, which are not described herein again.
Aiming at the existing problems, the invention provides a flexible display module, a fingerprint display device under a screen and a manufacturing method, through respectively arranging through holes with different apertures on a first film layer and a second film layer of a heat dissipation film to form a first opening and a second opening for installing a fingerprint identification module, wherein the aperture of the second opening arranged on the second film layer is larger than that of the first opening arranged on the first film layer, and the first film layer can provide film layer support for the opening of the second film layer arranged on the first film layer, so that the stress at the boundary of the second opening of the second film layer is reduced; and the shading adhesive tape is arranged on one side of the protective film layer, which is close to the display panel, and is positioned in the second opening, so that the section difference of the original shading adhesive tape arranged on one side of the protective film layer, which is far away from the display panel, is eliminated, the pasting force can be uniformly applied to the heat dissipation film, the stress of the opening in the module manufacturing process is further reduced, the die mark of the opening of the display panel is effectively reduced, the problems in the prior art are solved, and the shading adhesive tape has a wide application prospect.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. The utility model provides a flexible display module assembly, includes display panel, heat dissipation membrane and shading sticky tape, its characterized in that, the heat dissipation membrane is including range upon range of setting in proper order first rete, second rete and the protection rete that display panel kept away from the light-emitting side, wherein
The first film layer comprises a first opening penetrating through the first film layer, and the first opening corresponds to a sensing area of a fingerprint identification module to be mounted on the flexible display module;
the second film layer comprises a second opening penetrating through the second film layer, the second opening and the first opening are correspondingly arranged to expose the sensing area of the fingerprint identification module to be installed, and the aperture of the second opening is larger than that of the first opening;
the protective film layer covers the second film layer;
the shading adhesive tape is arranged on one side, close to the display panel, of the protective film layer and is positioned in the second opening, and the orthographic projection of the shading adhesive tape on the display panel covers the orthographic projection of the first opening on the display panel.
2. The flexible display module of claim 1, wherein a center point of an orthographic projection of the first opening on the display panel and a center point of an orthographic projection of the second opening on the display panel coincide.
3. The flexible display module of claim 1,
the orthographic projection of the first opening on the display panel, the orthographic projection of the second opening on the display panel and the orthographic projection of the shading adhesive tape on the display panel are axially symmetrical along a first direction;
and/or
The orthographic projection of the first opening on the display panel, the orthographic projection of the second opening on the display panel and the orthographic projection of the shading adhesive tape on the display panel are axially symmetrical along a second direction.
4. The flexible display module of claim 2 or 3,
the first film layer comprises a grid glue layer and a foam layer which are sequentially stacked on the side, far away from the light emergent side, of the display panel, the first opening comprises a first through hole penetrating through the grid glue layer and a second through hole penetrating through the foam layer, the aperture of the second through hole is larger than that of the first through hole, and the aperture of the second through hole is smaller than that of the second opening;
and/or
The second rete is including range upon range of setting in proper order keeping away from the polyimide layer and the copper foil layer of display panel in the first rete, the second trompil is including the third through-hole that link up the polyimide layer and link up the fourth through-hole of copper foil layer, the aperture of fourth through-hole is greater than the aperture of third through-hole, and the aperture of third through-hole is greater than the aperture of first trompil.
5. The flexible display module of claim 1, wherein the display panel comprises a non-bending display region and at least one bending display region, and the second film layer of the heat dissipation film is provided with a plurality of slots corresponding to the bending display regions.
6. The flexible display module of claim 5, wherein the plurality of slots are regularly arranged oval slots or prismatic slots.
7. The utility model provides a fingerprint display device under screen, its characterized in that, includes display panel, radiating film and fingerprint identification module, its characterized in that, the radiating film is including range upon range of setting in proper order first rete and the second rete that display panel kept away from the light-emitting side, wherein
The first film layer comprises a first opening penetrating through the first film layer, and the first opening corresponds to the sensing area of the fingerprint identification module;
the second film layer comprises a second opening penetrating through the second film layer, the second opening and the first opening are correspondingly arranged to expose the sensing area of the fingerprint identification module, and the aperture of the second opening is larger than that of the first opening;
the fingerprint identification module is arranged in the first opening and the second opening.
8. A method for manufacturing the flexible display module according to any one of claims 1 to 6, comprising
Adhering a first film layer to one side of the display panel, which is far away from the light emergent side, wherein the first film layer comprises a first opening penetrating through the first film layer, and the first opening corresponds to an induction area of a fingerprint identification module to be installed on the flexible display module;
adhering a second film layer to one side, far away from the display panel, of the first film layer, wherein the second film layer comprises a second opening hole penetrating through the second film layer, the second opening hole and the first opening hole are correspondingly arranged to expose a sensing area of the fingerprint identification module to be installed, and the aperture of the second opening hole is larger than that of the first opening hole;
and adhering a protective film layer to one side, far away from the display panel, of the second film layer, wherein a shading adhesive tape is arranged on one side, close to the display panel, of the protective film layer, the shading adhesive tape is positioned in the second opening, and the orthographic projection of the shading adhesive tape on the display panel covers the orthographic projection of the first opening on the display panel.
9. The method of manufacturing according to claim 8, wherein the display panel includes a non-bending display region and at least one bending display region, and the adhering the second film layer to the first film layer on a side away from the display panel further includes:
the second film layer is provided with a plurality of slots penetrating through the second film layer corresponding to the bending display areas, and the slots are oval slots or rhombic slots.
10. A manufacturing method for manufacturing an under-screen fingerprint display device is characterized by comprising the following steps:
forming a flexible display module according to any one of claims 1-6;
peeling off a protective film layer of a heat dissipation film of the flexible display module and a shading adhesive tape arranged on the protective film layer;
install fingerprint identification module in the first trompil and the second trompil of flexible display module's radiating film, fingerprint identification module's induction zone sees through second trompil and first trompil expose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010801193.6A CN111785175A (en) | 2020-08-11 | 2020-08-11 | Flexible display module, under-screen fingerprint display device and manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010801193.6A CN111785175A (en) | 2020-08-11 | 2020-08-11 | Flexible display module, under-screen fingerprint display device and manufacturing method |
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| CN111785175A true CN111785175A (en) | 2020-10-16 |
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| CN202010801193.6A Pending CN111785175A (en) | 2020-08-11 | 2020-08-11 | Flexible display module, under-screen fingerprint display device and manufacturing method |
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