CN111490084B - Preparation method of display module, display module and electronic equipment - Google Patents
Preparation method of display module, display module and electronic equipment Download PDFInfo
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- CN111490084B CN111490084B CN202010319064.3A CN202010319064A CN111490084B CN 111490084 B CN111490084 B CN 111490084B CN 202010319064 A CN202010319064 A CN 202010319064A CN 111490084 B CN111490084 B CN 111490084B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/0007—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality
- B32B37/0015—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality to avoid warp or curl
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
- B32B2038/0028—Stretching, elongating
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Abstract
The invention discloses a preparation method of a display module, the display module and electronic equipment, and relates to the technical field of display equipment. The main technical scheme of the invention is as follows: the preparation method of the display module comprises the following steps: manufacturing a back film layer and stretching the back film layer so that the back film layer has orientation along a first linear direction; arranging a display device layer on the back film layer, so that a first included angle is formed between the curling direction of the display device layer and the first straight line direction; arranging a flexible thin film layer on one side of the display device layer, which is far away from the back film layer; and arranging a hardening layer on one side of the flexible film layer, which deviates from the display device layer. The back film layer generates an internal stress vertical to the first linear direction under the action of orientation, and a component force of the internal stress parallel to the curling direction acts in a direction opposite to the curling direction, so that the curling of the display device layer is inhibited, and the display module can still return to a flat state after being curled for many times.
Description
Technical Field
The invention relates to the technical field of display, in particular to a preparation method of a display module, the display module and electronic equipment.
Background
The market share of the current bendable display products is getting bigger and bigger, such as a rollable display; the bendable display product depends on the OLED display device, and can realize crimpability and foldability. With the progress of the technology, the requirement on the thickness of a display product is higher and higher, and the foldable display product needs to be thinner and thinner, so that the folding radius is required to be smaller and smaller, and the multi-time bending or curling can be realized.
However, for a bendable display device, the strain accumulation of multiple curls makes it difficult for the material to return to a flat state, which in turn affects the user experience.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method for manufacturing a display module, and an electronic device, and mainly aim to solve the problem that the conventional curled display device is difficult to return to a flat state due to accumulated strain caused by multiple curls, thereby affecting user experience.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
the embodiment of the invention provides a preparation method of a display module, which comprises the following steps:
manufacturing a back film layer and stretching the back film layer so that the back film layer has orientation along a first linear direction;
arranging a display device layer on the back film layer, so that a first included angle is formed between the curling direction of the display device layer and the first straight line direction;
arranging a flexible thin film layer on one side of the display device layer, which is far away from the back film layer;
and arranging a hardening layer on one side of the flexible thin film layer, which deviates from the display device layer.
Optionally, in the method for manufacturing a display module, the manufacturing a back film layer and stretching the back film layer to make the back film layer have an orientation along a first linear direction includes:
preparing a master batch of the back film layer and slicing;
melting the master batch slices and extruding the master batch slices into a film;
cooling and shaping to form a back film layer;
stretching the backing film layer in a first linear direction, or
Stretching the back film layer along a first linear direction and a second linear direction perpendicular to the first linear direction, wherein the tensile force in the first linear direction is greater than the tensile force in the second linear direction;
and rolling and slicing the back film layer.
Optionally, in the method for manufacturing a display module, the back film layer is stretched along a first linear direction, or the back film layer is stretched along the first linear direction and a second linear direction perpendicular to the first linear direction: comprises that
Stretching either or both of the opposite ends of the backing film layer in a first linear direction, or
Either end or opposite ends of the backing layer are stretched in a first linear direction and either end or opposite ends of the backing layer are stretched in a second linear direction perpendicular to the first linear direction.
Optionally, in the method for manufacturing a display module, in the method for disposing a display device layer on the back film layer to form a first included angle between the curling direction of the display device layer and the first linear direction,
the first included angle is an acute angle.
Optionally, in the method for manufacturing a display module, the method for disposing a flexible film layer on a side of the display device layer away from the back film layer includes:
preparing the flexible thin film layer and arranging the flexible thin film layer on one side of the display device layer, which is far away from the back film layer; or alternatively
Preparing the flexible film layer and stretching the flexible film layer to provide the flexible film layer with an orientation along a third linear direction; disposing the flexible film layer having an orientation on a side of the display device layer facing away from the backsheet layer;
wherein the third linear direction is the same as the first linear direction; or
The third linear direction is perpendicular to the first linear direction.
Optionally, in a manufacturing method of the display module, the manufacturing method of the flexible film layer, and stretching the flexible film layer to make the flexible film layer have an orientation along a third linear direction, and the method for disposing the flexible film layer having the orientation on a side of the display device layer away from the back film layer includes:
enabling the warping orientation of the flexible film layer with the orientation in the direction vertical to the third linear direction to be opposite to the warping orientation of the back film layer in the direction vertical to the first linear direction
Optionally, the method for manufacturing a display module, wherein the manufacturing the flexible film layer and stretching the flexible film layer to make the flexible film layer have an orientation along a third linear direction includes
Stretching the flexible film layer in a third linear direction, or
Stretching the flexible film layer along a third linear direction and a fourth linear direction perpendicular to the third linear direction, wherein the tensile force in the fourth linear direction is greater than the tensile force in the third linear direction.
Optionally, in the method for manufacturing a display module, the stretching the flexible film layer along a third linear direction, or stretching the flexible film layer along the third linear direction and a fourth linear direction perpendicular to the third linear direction includes
Stretching either or both of the opposite ends of the flexible film layer in a third linear direction, or
Either or both of the opposite ends of the flexible film layer are stretched in a third linear direction and either or both of the opposite ends of the flexible film layer are stretched in a fourth linear direction perpendicular to the third linear direction.
In another aspect, the invention provides a display module, which includes a back film layer, a display device layer, a flexible thin film layer and a hardening layer, which are sequentially stacked; wherein:
the flexible film layer and/or the back film layer are/is a polymer orientation film, and the flexible film layer and/or the back film layer are/is oriented along a first linear direction so as to provide a force opposite to the curling direction of the display device layer;
the first straight line direction and the display device layer curling direction form a first included angle;
wherein the first included angle is an acute angle.
Optionally, in the display module, when the orientation along the first linear direction is provided on the back film layer, the orientation along a third linear direction is provided on the flexible film layer;
wherein the third linear direction is the same as the first linear direction, or
The third linear direction is perpendicular to the first linear direction.
In another aspect, the present invention provides an electronic device, which includes any one of the display modules described above.
The display module preparation method, the display module and the electronic equipment provided by the embodiment of the invention at least have the following beneficial effects: in order to solve the problem that the conventional display device with the curled shape is difficult to return to a flat state due to accumulated strain of multiple curls, and further influences user experience, in the preparation method of the display module provided by the invention, the back film layer is stretched during the preparation of the back film layer, so that the back film layer has orientation along the first linear direction, when the display device layer is arranged on the back film layer, a first included angle is formed between the curling direction of the display device layer and the first linear direction, further the back film layer generates internal stress vertical to the first linear direction under the action of the orientation, the component force of the internal stress in the parallel curling direction acts in the direction opposite to the curling direction, further the curling of the display device layer is inhibited, and the display module can still return to the flat state after multiple curls.
Drawings
Fig. 1 is a schematic flow chart illustrating a process for manufacturing a display module according to an embodiment of the invention;
FIG. 2 is a schematic diagram illustrating a detailed process for manufacturing a display module according to an embodiment of the present invention;
FIG. 3 is a schematic view of another detailed process for manufacturing a display module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a display module according to an embodiment of the present invention;
fig. 5 is a top view of a partial structure of a display module according to an embodiment of the present invention;
fig. 6 is a top view of a partial structure of a display module according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view of a portion of a display module according to an embodiment of the present invention;
in the figure: the display device comprises a back film layer 1, a display device layer 2, a flexible thin film layer 3, a hardening layer 4, a first straight line direction a, a curling direction b, a first included angle c and a third straight line direction d.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be made on the specific implementation, structure, features and effects of a display module, a display module and an electronic device according to the present invention with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In order to solve the technical problems, the embodiment of the invention adopts the following general idea:
example 1
Referring to fig. 1 and 4, in order to solve the problem that the conventional display device with curling has difficulty in returning a material to a flat state due to accumulated strain of curling for multiple times, thereby affecting user experience, the method for manufacturing a display module provided by the invention comprises the following steps:
101. manufacturing a back film layer 1 and stretching the back film layer 1 to enable the back film layer 1 to have orientation along a first linear direction a;
the back film layer 1 plays a role in supporting the display device layer 2 in the display module, and the thickness of the back film layer is 10-150um, preferably 25um; referring to fig. 4 and 5, in order to make the backsheet 1 have an internal stress F in a direction perpendicular to the first straight line a, the internal stress F is generated by stretching the backsheet 1 in a direction perpendicular to the first straight line a, the force F has a component force F1 and a component force F2 in a direction parallel to the curling direction b and perpendicular to the curling direction b, the backsheet 1 is made of any material, as long as the orientation along the first straight line a can be generated by stretching, the following examples of preferred embodiments are given, but the protection scope of the present application is not affected, the backsheet 1 may be made of a polyimide film (PI, yellow or transparent), and since the backsheet 1 only plays a supporting role and does not affect the display, a yellow polyimide film may be preferably selected, which plays a role in reducing the cost of PEN), a polyethylene terephthalate film (PET), a polyethylene naphthalate film (PEN), a polymethyl methacrylate film (PMMA), and a polycarbonate film (PC).
102. Arranging a display device layer 2 on the back film layer 2, so that a first included angle c is formed between the curling direction b of the display device layer 2 and the first linear direction a;
referring to fig. 4 and 5, the back film layer 1 and the display device layer 2 are bonded by OCA glue (here, the orientation along the first linear direction a may determine a good direction when the back film layer 1 is stretched to perform directional stretching, or may be a method of adjusting the direction of the back film layer 1 when the back film layer is bonded with the display device layer 2 by ordinary transverse and longitudinal stretching, so that a first intersection angle c is formed between the curling direction b of the display device layer 2 and the first linear direction, the first intersection angle c is an acute angle, preferably a 45-degree angle, and at this time, the component force F1 of the internal stress F is the largest, and F1 is parallel to and opposite to the curling direction b, so as to achieve an effect of suppressing curling of the display device layer 2. In the curled display device, the display device layer 2 is a flexible OLED display device layer, and has small thickness and good softness which is only about 20 um; the display device layer 2 is composed of a plurality of light emitting devices, each light emitting device includes an anode layer, a light emitting layer and a cathode layer, which are sequentially stacked, the light emitting device or the display device layer 2 is similar to or identical to the prior art, and the display device layer 2 is not important for protection of the application, and therefore the display device layer 2 is not described in detail herein.
103. Arranging a flexible thin film layer 3 on one side of the display device layer 2, which is far away from the back film layer 1;
the flexible film layer 3 is adhered to the display device layer 2 at one side of the display device layer 2, which is far away from the back film layer 1, through OCA glue; the thickness of the flexible thin film layer 3 is 20um-150um, preferably 50um, the material for manufacturing the flexible thin film layer 3 can be a transparent polyimide film (CPI), a polyethylene terephthalate film (PET), a polypropylene film (PP), a polyethylene naphthalate film (PEN), a thermoplastic polyurethane film (TPU), a polymethyl methacrylate film (PMMA), a cycloolefin polymer film (COP), a polycarbonate film (PC), a triacetate fiber film (TAC), a transparent aramid film and the like, and the transparent polyimide film (CPI) is preferably selected, so that a better display effect can be achieved.
It should be noted that: referring to fig. 4, the display module disclosed in the embodiment of the present application includes two thin film layers, namely, the back film layer 1 and the flexible thin film layer 3, on and under the display device layer 2, respectively, it can be understood that in this embodiment, at least one of the two layers may be stretched during the manufacturing process to have the orientation that meets the requirement, or both layers may be stretched simultaneously to have the orientation that meets the requirement, so as to enhance the effect of suppressing the curling.
104. And arranging a hardening layer 4 on one side of the flexible film layer 3 departing from the display device layer 2.
The hardened layer 4 and the flexible thin film layer 3 form a cover plate structure of the display module, and the hardened layer 4 is formed by coating on one side of the flexible thin film layer 3, which is far away from the display device layer 2, which is easily realized by a person skilled in the art and is not described herein again; the hardened layer 4 can be made of polyurethane acrylate polymer or siloxane polymer and the like, and the thickness is 1um-20um, preferably 10um.
According to the above list, in the preparation method of the display module provided by the invention, when the back film layer 1 is manufactured, the back film layer 1 is stretched, so that the back film layer 1 has an orientation along the first linear direction a, when the display device layer 2 is arranged on the back film layer 1, a first included angle c is formed between the curling direction b of the display device layer 2 and the first linear direction a, then the back film layer 1 generates an internal stress F perpendicular to the first linear direction a under the action of the orientation, and the component force internal stress F acts in a direction opposite to the curling direction b on the back film layer 1 in the direction parallel to the curling direction, so that the curling of the display device layer 2 is inhibited, and the display module can still return to a flat state after being curled for many times.
The term "and/or" herein is only one kind of association relationship describing the association object, and means that three relationships may exist, for example, a and/or B, and is specifically understood as follows: a and B can be contained simultaneously, A can exist independently, B can exist independently, and any one of the three conditions can be met; wherein the inside and outside are referenced to the inside and outside in the actual installation.
Further, referring to fig. 2, in a method for manufacturing a display module according to an embodiment of the present invention, the method for manufacturing a back film layer and stretching the back film layer 1 to make the back film layer 1 have an orientation along a first linear direction includes the following steps:
201. preparing a master batch of the back film layer 1 and slicing;
taking a polyethylene terephthalate film (PET) as an example, a polyethylene terephthalate master batch is prepared and sliced to have a small particle diameter.
202. Melting the master batch slices and extruding the master batch slices into a film;
and (3) feeding the sliced master batch into an extruder, heating (290 ℃) to be molten, and then extruding the molten master batch into a film by the extruder.
203. Cooling and shaping to form a back film layer 1;
and cooling the film-formed polyimide in a cold rolling wheel until the film-formed polyimide is formed into a back film layer 1.
204. Stretching the backing layer 1 in a first linear direction a, or
Stretching the back film layer a along a first linear direction a and a second linear direction perpendicular to the first linear direction a, wherein the tensile force of the first linear direction a is greater than that of the second linear direction;
referring to fig. 5, in order to make the film-formed polyimide, i.e., the back film layer 1, have a desired thickness and have an orientation in the first linear direction a, it may be stretched by a longitudinal/transverse stretcher in two ways:
the first method comprises the following steps: stretching the back film layer 1 in a first linear direction a by using a longitudinal/transverse drawing machine, wherein the back film layer 1 has orientation along the first linear direction a;
here, the longitudinal/transverse drawing machine may stretch either one end or both opposite ends of the back film layer 1 in a first linear direction a during the stretching process, and preferably stretch both opposite ends of the back film layer 1 in the first linear direction a, so as to ensure that the back film layer 1 is uniformly stressed and the film thickness is uniform.
And the second method comprises the following steps: stretching the back film layer 1 in a first linear direction a by using one of a longitudinal drawing machine and a transverse drawing machine, and stretching the back film layer 1 in a second linear direction perpendicular to the first linear direction a by using the other one of the longitudinal drawing machine and the transverse drawing machine, wherein the tension in the first linear direction a is ensured to be greater than that in the second linear direction, so that the back film layer 1 has orientation in the first linear direction a;
here, the longitudinal drawing machine and the transverse drawing machine may stretch any end or opposite ends of the back film layer 1 along a first linear direction a during the stretching process, and stretch any end or opposite ends of the back film layer 1 along a second linear direction perpendicular to the first linear direction a, preferably stretch opposite ends of the back film layer 1 along the first linear direction a and opposite ends in the direction perpendicular to the first linear direction a, so as to ensure that the back film layer 1 is uniformly stressed and has a uniform film thickness.
Wherein, the pulling force along the first straight line direction a is larger than the pulling force along the second straight line direction, for example: the tension along the first straight line direction a can be several times of the tension along the second straight line direction, and can be adjusted according to actual needs; the magnitude of the tensile force in the first linear direction a may also be determined according to the magnitude of the force in the curling direction b of the display device layer 2, and the greater the tensile force in the first linear direction a, the greater the internal stress F, the greater the component force F1, and the greater the curling inhibiting effect on the display device layer 2.
Further, in order to ensure the stretching effect, in this embodiment, after the step 203, the film-formed polyimide, that is, the back film layer 1, needs to be preheated, an oven is used for preheating, the film-formed polyimide, that is, the back film layer 1, is placed in the oven, the temperature is kept at 65-80 ℃ for preheating for 10-20 minutes, and damage to the film layer or poor stretching effect caused by directly stretching the cooled film-formed polyimide, that is, the back film layer 1, is avoided.
205. Rolling and slicing the back film layer 1;
after step 205, the step 102 may be executed, which is specifically referred to above and will not be described in detail herein.
The preparation conditions in the above steps are only examples, and corresponding adjustment is actually required according to different materials, which is not described herein again; in addition, the steps 201 to 205 may be performed as steps for manufacturing the flexible thin film layer 3, and the effect of suppressing the curling of the display device layer 2 can be achieved by performing the steps 201 to 205 on at least one of the back film layer 1 and the flexible thin film layer 3.
Example 2
Further, on the basis of embodiment 1, referring to fig. 3, in the method for manufacturing a display module according to the embodiment of the present invention, step 103, a method for disposing a flexible thin film layer 3 on a side of the display device layer 2 away from the back film layer 1, includes the following steps:
301. preparing the flexible thin film layer 3 and arranging the flexible thin film layer 3 on one side of the display device layer 2, which is far away from the back film layer 1;
the preparation method of the flexible film 3 is the same as the preparation method of the back film layer 1, and please refer to detailed descriptions of steps 201 to 203 and step 205 in embodiment 1 for a specific implementation manner, which is not described herein again.
Or 302, preparing the flexible film layer 3, stretching the flexible film layer 3 to enable the flexible film layer 3 to have an orientation along a third linear direction d, and arranging the flexible film layer 3 with the orientation on the side of the display device layer 2, which is far away from the back film layer 1;
wherein the third linear direction d is the same as the first linear direction a; or
The third linear direction d is perpendicular to the first linear direction a.
Referring to fig. 6, in order to enhance the anti-curling performance of the display module, in this embodiment, in the process of preparing the flexible film layer 3, the flexible film layer 3 may also be stretched to have an orientation along the third linear direction d, when the third linear direction d is perpendicular to the first linear direction a, an internal stress F 'generated in a direction perpendicular to the third linear direction d is perpendicular to the internal stress F in fig. 5, and at this time, the internal stress F' also has a component force F1 'in a direction parallel to the curling direction b of the display device layer 2, and the component force F1' can further cooperate with the backsheet layer 1 to suppress curling; when the third linear direction d is the same as the first linear direction a (not shown in the figure), an internal stress F 'can be generated in a direction perpendicular to the third linear direction d, and the internal stress F' is the same as the internal stress F in fig. 5, and a component force F1 'of the internal stress F' in a direction parallel to the rolling direction b of the display device layer 2 can further cooperate with the back film layer 1 to suppress rolling.
Referring to fig. 5, since the back film layer 1 has an orientation of a first straight direction a, an internal stress F of the back film layer 1 in a direction perpendicular to the first straight direction a may cause the back film layer 1 to generate a warpage or a warpage tendency, in order to prevent the back film layer 1 from warpage, which causes the display device layer 2 to generate a warpage or a warpage tendency, in this embodiment, the step 302 is specifically to arrange the flexible film layer 3 having an orientation on a side of the display device layer 2 facing away from the back film layer 1, such that a warpage orientation of the flexible film layer 3 having an orientation in a direction perpendicular to the third straight direction d is opposite to a warpage orientation of the back film layer 1 in a direction perpendicular to the first straight direction a, where the opposite directions may be opposite to each other, that is, an edge of the back film layer 1 having a warpage or warpage tendency and an edge of the flexible film layer 3 having a warpage or warpage tendency are completely opposite, or an edge of the back film layer 1 having a warpage or a warpage tendency and an edge of the flexible film layer 3 having a warpage or warpage tendency are perpendicular to each other, and both of the two tendencies are included in the protection ranges. For example: referring to fig. 7, it shows that the edge of the back film layer 1 that generates warpage or warpage tendency is completely opposite to the edge of the flexible thin film layer 3 that generates warpage or warpage tendency, and if the back film layer 1 generates downward warpage or warpage tendency, the flexible thin film layer 3 correspondingly generates upward warpage or warpage tendency, so as to overcome the warpage or warpage tendency of the back film layer 1, and ensure that the display device layer 2 does not warp in the direction perpendicular to the curling direction b on the premise of suppressing curling, which affects user experience.
In order to achieve the desired thickness of the flexible film layer 3 and to have an orientation along the third linear direction d, the flexible film layer may be stretched by a longitudinal/transverse stretching machine in two ways:
the first method comprises the following steps: stretching the flexible film layer 3 along a third linear direction d by using a longitudinal/transverse stretching machine, so that the flexible film layer 3 has orientation along the third linear direction d;
here, the longitudinal/transverse drawing machine may stretch either one end or both opposite ends of the flexible film layer 3 in the third linear direction d during the stretching process, and preferably stretch both opposite ends of the flexible film layer 3 in the third linear direction d, so as to ensure that the flexible film layer 3 is uniformly stressed and the film thickness is uniform.
And the second method comprises the following steps: stretching the flexible film layer 3 in a third linear direction d by using one of a longitudinal stretching machine and a transverse stretching machine, and stretching the flexible film layer 3 in a fourth linear direction perpendicular to the third linear direction d by using the other one of the longitudinal stretching machine and the transverse stretching machine, wherein the tension in the third linear direction d is greater than that in the fourth linear direction d, so that the flexible film layer 3 has orientation in the third linear direction d;
here, the longitudinal drawing machine and the transverse drawing machine can stretch any end or two opposite ends of the flexible film layer 3 along a third linear direction d in the stretching process, stretch any end or two opposite ends of the flexible film layer 3 along a fourth linear direction perpendicular to the third linear direction d, preferably stretch two opposite ends of the flexible film layer 3 along the third linear direction d and two opposite ends in the direction perpendicular to the third linear direction d, and ensure that the flexible film layer 3 is uniformly stressed and the film thickness is uniform.
Wherein, the pulling force along the third linear direction d is larger than the pulling force along the fourth linear direction, for example: the tension in the third linear direction d can be several times of the tension in the fourth linear direction, and can be adjusted according to actual needs, and if the orientation in the third linear direction d is strong, the times can be adjusted; the magnitude of the tensile force in the third linear direction d may also be determined according to the magnitude of the force in the curling direction b of the display device layer 2, and the greater the tensile force in the third linear direction d, the greater the internal stress F, the greater the component force F1, and the greater the curling inhibiting effect on the display device layer 2. Further, in order to ensure the stretching effect, in this embodiment, the flexible thin film layer 3, which is the film-formed polyimide, needs to be preheated after the step 203, and the preheating condition refers to the detailed description of embodiment 1, so as to avoid the damage of the film layer or the poor stretching effect caused by directly stretching the film-formed polyimide, which is the flexible thin film layer 3, after cooling.
In addition, the steps 301 and 302 may be steps for manufacturing the back film layer 1, and when the flexible film layer 3 has an orientation that meets the requirements, the back film layer 1 may be manufactured as usual in the step 301, or may be manufactured by a stretching operation in the step 302.
It should be noted that: in fig. 5 and fig. 6, in order to clearly show the stress of each film layer, the back film layer 1 and the flexible film layer 3 are completely covered and attached to the display device layer 2, and there is no missing part.
Example 3
Referring to fig. 4, an embodiment of the present invention provides a display module obtained by applying the display module manufacturing method of the above embodiment, which includes a back film layer 1, a display device layer 2, a flexible thin film layer 3, and a hardening layer 4, which are sequentially stacked; wherein:
the flexible film layer 3 and/or the back film layer 1 is a polymer orientation film, and the flexible film layer 3 and/or the back film layer 1 has an orientation along a first linear direction a so as to provide a force opposite to the curling direction b of the display device layer 2;
a first included angle c is formed between the first straight line direction a and the curling direction b of the display device layer 2; wherein the first included angle c is an acute angle.
Specifically, in order to solve the problem that the existing curled display device is difficult to return to a flat state due to accumulated strain of multiple curls, and thus user experience is affected, an embodiment of the present invention provides a display module, which includes the backsheet layer 1, the display device layer 2, the flexible film layer 3, and the hardened layer 4, and referring to fig. 4 and fig. 5, the backsheet layer 1 and/or the flexible film layer 3 are stretched during the process of manufacturing the backsheet layer 1 and/or the flexible film layer 3 to have an orientation along a first linear direction a, so that a polymer orientation film is formed, and then the backsheet layer 1 and/or the flexible film layer 3 generate an internal stress F in a direction perpendicular to the first linear direction a, and the F has a component force F1 and a component force F2 in directions parallel to and perpendicular to the curling direction b, respectively, and at the same time, a first intersection angle c is formed between the curling direction b of the display device layer 2 and the first linear direction a, and the first angle c is an acute angle, preferably a 45 degree angle is adopted, and at this time, and the component force F1 is the maximum, and F is parallel to the curling direction b, and is opposite to the curling direction b, so that the display device can suppress the internal stress of the display module. It should be noted that: referring to fig. 4, the display module disclosed in the embodiment of the present application includes two thin film layers, namely, the back film layer 1 and the flexible thin film layer 3, respectively on and below the display device layer 2, so that it can be understood that in this embodiment, at least one of the two layers may be subjected to a stretching operation during the manufacturing process, so that the back film layer 1 and the flexible thin film layer 3 have a desired orientation, or both of the two layers may be simultaneously stretched, so that the back film layer and the flexible thin film layer have a desired orientation, so as to enhance the effect of suppressing the curling.
Further, referring to fig. 5 and fig. 6, in the display module according to the embodiment of the present invention, when the orientation along the first linear direction a is provided on the back film layer 1, the orientation along the third linear direction d is provided on the flexible film layer 3;
wherein the third linear direction d is the same as the first linear direction a, or
The third linear direction d is perpendicular to the first linear direction a.
Specifically, in order to enhance the anti-curling performance of the display module, in this embodiment, when the back film layer 1 has the first linear direction a, the flexible film layer 3 is configured to have an orientation along the third linear direction d, and when the third linear direction d is the same as the first linear direction a, an internal stress F 'can be generated in a direction perpendicular to the third linear direction d, where the internal stress F' is the same as the internal stress F in fig. 5, and a component force F1 'of the internal stress F' in a direction parallel to the curling direction b of the display device layer 2 can further cooperate with the back film layer 1 to act as a rolling-up inhibitor; when the third linear direction d is perpendicular to the first linear direction a, the internal stress F 'generated in the direction perpendicular to the third linear direction d is perpendicular to the internal stress F in fig. 5, and the internal stress F' also has a component force F1 'in the rolling direction b parallel to the display device layer 2, and the component force F1' can further cooperate with the back film layer 1 to suppress rolling.
Wherein, because the back film layer 1 has an orientation in a first straight direction a, an internal stress F of the back film layer 1 in a direction perpendicular to the first straight direction a may cause the back film layer 1 to generate a warpage or warpage tendency, and in order to prevent the display device layer 2 from generating warpage or warpage tendency due to warpage of the back film layer 1, in this embodiment, when the flexible thin film layer 3 is disposed on a side of the display device layer 2 facing away from the back film layer 1, the warpage of the flexible thin film layer 3 having the orientation in the direction perpendicular to the third straight direction d faces away from the warpage of the back film layer 1 in the direction perpendicular to the first straight direction a, for example: referring to fig. 7, if the back film layer 1 has a downward warping tendency, the flexible thin film layer 3 has an upward warping tendency, so as to overcome the warping tendency of the back film layer 1, and ensure that the display device layer 2 does not warp in a direction perpendicular to the curling direction b on the premise of suppressing curling, which affects user experience.
Example 4
The embodiment of the invention provides electronic equipment which comprises the display module.
Specifically, the display module described in this embodiment is the display module described in embodiment 3, and the electronic device described in this embodiment may be a terminal device such as a notebook computer, a smart phone, and a tablet computer. The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (10)
1. A preparation method of a display module is characterized by comprising the following steps:
manufacturing a back film layer and stretching the back film layer so that the back film layer has orientation along a first linear direction;
arranging a display device layer on the back film layer, so that a first included angle is formed between the curling direction of the display device layer and the first straight line direction;
arranging a flexible thin film layer on one side of the display device layer, which is far away from the back film layer;
arranging a hardening layer on one side of the flexible thin film layer, which is far away from the display device layer;
wherein, set up flexible thin layer in one side that display device layer deviates from the notacoria layer specifically is:
preparing the flexible thin film layer and arranging the flexible thin film layer on one side of the display device layer, which is far away from the back film layer; or
Preparing the flexible film layer, stretching the flexible film layer to enable the flexible film layer to have orientation along a third linear direction, and arranging the flexible film layer with the orientation on one side, away from the back film layer, of the display device layer; the third linear direction is the same as the first linear direction, or the third linear direction is perpendicular to the first linear direction.
2. The method for manufacturing a display module according to claim 1, wherein: the method for manufacturing the back film layer and stretching the back film layer to enable the back film layer to have orientation along the first straight line direction comprises the following steps:
preparing a master batch of the back film layer and slicing;
melting the master batch slices and extruding the master batch slices into a film;
cooling and shaping to form a back film layer;
stretching the backing film layer in a first linear direction, or
Stretching the back film layer along a first linear direction and a second linear direction perpendicular to the first linear direction, wherein the tensile force in the first linear direction is greater than the tensile force in the second linear direction;
and rolling and slicing the back film layer.
3. The method for manufacturing a display module according to claim 2, wherein: in the method for stretching the back film layer along a first linear direction, or stretching the back film layer along the first linear direction and a second linear direction perpendicular to the first linear direction: comprises that
Stretching either or both of the opposite ends of the backing film layer in a first linear direction, or
Either end or opposite ends of the backing layer are stretched in a first linear direction and either end or opposite ends of the backing layer are stretched in a second linear direction perpendicular to the first linear direction.
4. The method for manufacturing a display module according to claim 1, wherein: in the method for arranging the display device layer on the back film layer to enable the curling direction of the display device layer and the first straight line direction to form a first included angle,
the first included angle is an acute angle.
5. The method of claim 1, wherein the method of preparing the flexible film layer and stretching the flexible film layer to provide the flexible film layer with an orientation along a third linear direction, and disposing the flexible film layer with the orientation on a side of the display device layer facing away from the back film layer comprises:
and enabling the warping orientation of the flexible film layer with the orientation in the direction vertical to the third linear direction to be opposite to the warping orientation of the back film layer in the direction vertical to the first linear direction.
6. The method for manufacturing a display module according to claim 1, wherein: said preparing said flexible film layer and stretching said flexible film layer to impart said flexible film layer with an orientation along a third linear direction comprising
Stretching the flexible film layer in a third linear direction, or
Stretching the flexible film layer along a third linear direction and a fourth linear direction perpendicular to the third linear direction, wherein the tensile force in the fourth linear direction is greater than the tensile force in the third linear direction.
7. The method for manufacturing a display module according to claim 6, wherein: the method for stretching the flexible film layer along the third linear direction or stretching the flexible film layer along the third linear direction and a fourth linear direction perpendicular to the third linear direction comprises
Stretching either or both of the opposite ends of the flexible film layer in a third linear direction, or
Either or both of the opposite ends of the flexible film layer are stretched in a third linear direction and either or both of the opposite ends of the flexible film layer are stretched in a fourth linear direction perpendicular to the third linear direction.
8. A display module obtained by applying the preparation method of the display module according to claims 1-7, which comprises a back film layer, a display device layer, a flexible thin film layer and a hardening layer which are sequentially stacked; the method is characterized in that:
the flexible film layer and/or the back film layer are/is a polymer orientation film, and the flexible film layer and/or the back film layer are/is provided with orientation along a first linear direction so as to provide a force opposite to the curling direction of the display device layer;
the first straight line direction and the display device layer curling direction form a first included angle;
wherein the first included angle is an acute angle.
9. The display module according to claim 8, wherein:
when the back film layer is oriented along the first linear direction, the flexible film layer is oriented along a third linear direction;
wherein the third linear direction is the same as the first linear direction, or
The third linear direction is perpendicular to the first linear direction.
10. An electronic device, comprising:
a display module according to any one of claims 8 to 9.
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