CN114446176A - Foldable display device - Google Patents
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- CN114446176A CN114446176A CN202210133326.6A CN202210133326A CN114446176A CN 114446176 A CN114446176 A CN 114446176A CN 202210133326 A CN202210133326 A CN 202210133326A CN 114446176 A CN114446176 A CN 114446176A
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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
- 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
- G09F9/33—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 being semiconductor devices, e.g. diodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a foldable display device, which is provided with a folding area and non-folding areas positioned at two opposite sides of the folding area, wherein the foldable display device comprises a flexible display panel and a rigid support layer arranged at the back of the flexible display panel; wherein, the surface of the rigid supporting layer facing to one side of the flexible display panel is provided with a groove which is positioned in the folding area and is internally filled with flexible expansion materials. According to the invention, the groove of the folding area corresponding to the rigid support layer is filled with the flexible expansion material, and the flexible expansion material is expanded by utilizing heat generated after the flexible display panel is lightened, so that the part of the folding area corresponding to the rigid support layer is subjected to bending deformation in the direction opposite to the folding direction of the foldable display device, and the bending deformation of the rigid support layer can tension the flexible display panel attached to the rigid support layer, thereby solving the problem that the surface of a screen is creased due to the plastic deformation of the organic material in the folding area of the flexible display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a foldable display device.
Background
With the continuous breakthrough of the OLED display technology, flexible display products are widely used. As an important member of flexible displays, foldable display screens have been extensively studied in the industry. As shown in fig. 1, a problem of the existing foldable display screen 100 ' is that, most of the film layers of the foldable display screen 100 ' are made of flexible organic materials, and after being bent for many times, the organic materials in the folding area 100a ' are easily subjected to plastic deformation, so that the surface of the screen may generate unrecoverable creases, which affects user experience.
Therefore, the prior art has defects which need to be solved urgently.
Disclosure of Invention
The invention provides a foldable display device, which can solve the technical problem that after the foldable display device in the prior art is folded for multiple times, the folding lines are generated on the surface of a screen due to the plastic deformation of organic materials in the folding area of a flexible display panel.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
the embodiment of the invention provides a foldable display device, which is provided with a folding area and non-folding areas positioned at two opposite sides of the folding area, wherein the foldable display device comprises a flexible display panel and a rigid support layer arranged at the back of the flexible display panel;
the surface of one side, facing the flexible display panel, of the rigid supporting layer is provided with a groove, the groove is located in the folding area, and the groove is filled with flexible expansion materials.
Optionally, in some embodiments of the present invention, in a direction in which the flexible display panel points to the rigid support layer, the thickness of the flexible expansion material is equal to the depth of the groove; the width of the flexible intumescent material is equal to the width of the groove in the direction of the non-folded region towards the folded region.
Optionally, in some embodiments of the present invention, the groove includes two oppositely disposed first side edges adjacent to the non-folded region, the first side edges extending along the extending direction of the folded region to the boundary of the rigid support layer; wherein the thickness range of the rigid support layer corresponding to the non-folding area is 100-200 μm, and the thickness range of the rigid support layer corresponding to the folding area is 30-70 μm.
Optionally, in some embodiments of the invention, a width of the flexible intumescent material in a direction of the non-folding region pointing towards the folding region is larger than a thickness of the flexible intumescent material in a direction of the flexible display panel pointing towards the rigid support layer.
Optionally, in some embodiments of the inventionThe linear expansion coefficient of the flexible expansion material is in the range of 100 multiplied by 10-6/℃～400×10-6The linear expansion coefficient of the rigid supporting layer is within the range of 0.5 multiplied by 10 DEG C-6/℃～50×10-6/℃。
Optionally, in some embodiments of the present invention, the flexible intumescent material comprises at least one of silicone rubber, neoprene rubber, styrene butadiene rubber, and chlorinated polyethylene rubber.
Optionally, in some embodiments of the present invention, when the flexible display panel is not lit, an ambient temperature parameter of the flexible expansion material is a first temperature parameter, and after the flexible display panel is lit for a preset time, the ambient temperature parameter of the flexible expansion material is a second temperature parameter;
the flexible intumescent material is in a first state at the first temperature parameter and in a second state at the second temperature parameter;
wherein the second temperature parameter is greater than the first temperature parameter, the flexible intumescent material expanding when the flexible intumescent material transitions from the first state to the second state.
Optionally, in some embodiments of the present invention, in the fully unfolded state of the foldable display device, when the flexible expansion material is transformed from the first state to the second state, the flexible expansion material is deformed in a first direction, which is a direction opposite to a folding direction of the foldable display device;
when the flexible intumescent material is in a first state, the portion of the rigid support layer corresponding to the fold region is in a first configuration; when the flexible intumescent material is in a second state, the portion of the rigid support layer corresponding to the fold region is in a second configuration;
when the portion of the rigid support layer corresponding to the folding area is transformed from the first configuration to the second configuration, the portion of the rigid support layer corresponding to the folding area is deformed in the first direction.
Optionally, in some embodiments of the present invention, the foldable display device further includes an adhesive layer, and the flexible display panel and the rigid support layer are attached by the adhesive layer;
when the flexible expansion material is in the first state, the part of the adhesive layer corresponding to the folding area is in a third state, and the part of the flexible display panel corresponding to the folding area is in a fourth state;
when the flexible expansion material is in the second state, the part of the adhesive layer corresponding to the folding area is in a fifth state, and the part of the flexible display panel corresponding to the folding area is in a sixth state;
wherein when the portion of the adhesive layer corresponding to the folding area is transformed from the third form to the fifth form, the portion of the adhesive layer corresponding to the folding area is deformed in the first direction;
when the part of the flexible display panel corresponding to the folding area is converted from the fourth state to the sixth state, the part of the flexible display panel corresponding to the folding area is deformed towards the first direction.
Optionally, in some embodiments of the present invention, when the flexible intumescent material is transformed from the first state to the second state, the flexible intumescent material deforms by a first threshold amount in a second direction, the second direction being a direction in which the non-folded region points towards the folded region;
when the part of the adhesive layer corresponding to the folding area is converted from the third form to the fifth form, the deformation amount of the part of the adhesive layer corresponding to the folding area in the second direction is greater than 0 and less than or equal to the first threshold value;
when the part of the flexible display panel corresponding to the folding area is converted from the fourth state to the sixth state, the deformation amount of the part of the flexible display panel corresponding to the folding area in the second direction is greater than 0 and less than or equal to the first threshold value.
The invention has the beneficial effects that: the foldable display device provided by the invention has the advantages that the groove corresponding to the folding area is formed on the surface of the rigid support layer facing to one side of the flexible display panel, the groove is filled with the flexible expansion material, the flexible expansion material is expanded by utilizing the heat generated after the flexible display panel is lightened, so that the rigid support layer is bent and deformed in the direction opposite to the folding direction of the foldable display device, the flexible display panel attached to the rigid support layer can be tensioned by the deformation of the rigid support layer, the part of the flexible display panel corresponding to the folding area is also deformed correspondingly, and the problem of crease (plastic deformation) caused by folding of the organic material in the folding area of the flexible display panel is solved.
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 will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of a prior art foldable display screen after it is fully unfolded;
fig. 2 is a schematic cross-sectional structural view of a foldable display device provided in an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a rigid support layer provided by an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a rigid support layer having grooves filled with a flexible intumescent material according to an embodiment of the invention;
FIG. 5 is a schematic cross-sectional view of the flexible intumescent material and rigid support layer of FIG. 4 at a first temperature parameter;
FIG. 6 is a schematic cross-sectional view of the flexible intumescent material and rigid support layer of FIG. 4 at a second temperature parameter;
FIG. 7 is a schematic cross-sectional view of a foldable display device according to an embodiment of the present invention after being fully unfolded and at a first temperature parameter;
FIG. 8 is a schematic cross-sectional view of the foldable display device of FIG. 7 at a second temperature parameter;
FIG. 9 is another schematic cross-sectional view of a foldable display device at a first temperature parameter after being fully unfolded as provided by an embodiment of the present invention;
fig. 10 is a schematic cross-sectional view of the foldable display device of fig. 9 at a second temperature parameter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Furthermore, it should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, and are not intended to limit the present invention. In the present invention, unless otherwise specified, the use of directional terms such as "upper" and "lower" generally means upper and lower in the actual use or operation of the device, particularly in the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
Referring to fig. 2 to 10, an embodiment of the invention provides a foldable display device 100, and the foldable display device 100 is a flexible foldable display device. The foldable display device 100 may be an inner foldable display device or an outer foldable display device. The foldable display device 100 has a folding area 100a and non-folding areas 100b located at opposite sides of the folding area 100 a. Wherein, the foldable display device 100 is used for displaying images at the portions corresponding to the folding area 100a and the non-folding area 100 b.
The foldable display device 100 may be switchable between a flat-out state and a fully-folded state, or may be switchable between the flat-out state, the fully-folded state, and an intermediate state between the flat-out state and the fully-folded state.
The width of the folding region 100a of the foldable display device 100 may be 1 mm to 300 mm. For example, the width of the folding zone 100a may be 2 mm, 5 mm, 10mm, 20 mm, 50 mm, 100 mm, and 200 mm.
The foldable display device 100 includes a flexible display panel 101 and a rigid support layer 102, where a front surface of the flexible display panel 101 is a display surface, and the rigid support layer 102 is disposed on a back surface of the flexible display panel 101 and is used to provide support for the flexible display panel 101.
The flexible display panel 101 is used to emit light to display an image. The flexible display panel 101 is a flexible organic light emitting diode display panel. The flexible display panel 101 may be a top emission type organic light emitting diode display panel or a bottom emission type organic light emitting diode display panel. The flexible display panel 101 includes a flexible substrate 1011, a thin film transistor array layer (not shown), and a display layer 1012, which are stacked.
The flexible substrate 1011, which is typically an organic material, serves as a carrier, and supports the thin film transistor array layer and the display layer 1012, etc., while providing the flexible display panel 101 with good flexibility. Illustratively, the flexible substrate 1011 may be a polyimide layer. The thin film transistor array layer includes a plurality of thin film transistors arranged in an array, and the thin film transistors are used as switches to control the light emission of the organic light emitting diodes in the display layer 1012. The display layer 1012 is used for emitting light to display an image, and includes a plurality of organic light emitting diodes arranged in an array, which may include a red organic light emitting diode, a blue organic light emitting diode, and a green organic light emitting diode; the plurality of organic light emitting diodes arranged in an array may also include white organic light emitting diodes. Each organic light emitting diode includes an anode, a cathode, and an organic light emitting layer between the anode and the cathode.
The rigid support layer 102 may be rigid glass, or may also be a rigid metal or non-metal material, which can provide good support for the flexible display panel 101, and at the same time, a portion of the rigid support layer 102 corresponding to the folding area 100a has good flexibility, so that it does not affect the bending of the foldable display device 100.
Referring to fig. 2, a groove 1021 is disposed on a surface of the rigid support layer 102 facing the flexible display panel 101, the groove 1021 is located in the folding area 100a, and the groove 1021 is filled with a flexible expansion material 103. It is understood that the flexible expansion material 103 is a thermal expansion material, and will expand and deform when heated.
Since the organic material on the flexible display panel is easily subjected to plastic deformation during a long-term folding process, in order to solve the problem that the folding region of the flexible display panel is creased due to plastic deformation, in this embodiment, a portion of the rigid support layer 102 of the foldable display device 100 corresponding to the folding region 100a is thinned, on one hand, to meet the flexibility requirement of the foldable display device 100, and on the other hand, the groove 1021 formed after the thinning process is filled with the flexible expansion material 103, the flexible expansion material 103 is heated to expand and deform by using heat generated after the flexible display panel 101 is lit, and when the flexible expansion material 103 expands, a transverse force (as shown by an arrow in the figure) is generated in a direction from the folding region 100a to the non-folding region 100b, so that the rigid support layer 102 is bent and deformed in a direction opposite to the folding direction of the foldable display device 100, the bending deformation of the rigid support layer 102 can tension the flexible display panel 101 attached thereto, so that the portion of the flexible display panel 101 corresponding to the folding area 100a is also deformed correspondingly, and thus the crease of the folding area 100a of the flexible display panel 101 can be "straightened/flattened", thereby solving the problem that the folding area of the flexible display panel is creased due to plastic deformation.
In view of the above, the embodiment of the present invention achieves the above object by forming the groove 1021 at the position of the rigid support layer 102 of the foldable display device 100 corresponding to the folding area 100a and filling the flexible expansion material 103, and the specific scheme will be described as follows.
It is understood that the main function of the rigid support layer 102 is to provide a supporting force for the flexible display panel 101, and therefore the thickness of the rigid support layer 102 in the embodiment of the present invention ranges from 100 μm to 200 μm to ensure a sufficient supporting force. Meanwhile, to meet the folding requirements of the foldable display device 100The portion of the rigid support layer 102 corresponding to the folding area 100a needs to be thinned, so that the portion of the rigid support layer 102 corresponding to the folding area 100a has good flexibility. In addition, in order to ensure the adhesion reliability of the rigid support layer 102 and the flexible display panel 101 and not to damage the flexible display panel 101, the rigid support layer 102 is required to have a low thermal expansion performance. In particular, the linear expansion coefficient of the rigid support layer 102 ranges from 0.5 × 10-6/℃～50×10-6/℃。
Referring to fig. 2 and fig. 3, after thinning the portion of the rigid support layer 102 corresponding to the folding area 100a, a groove 1021 may be formed at the position of the folding area 100a, where the groove 1021 is recessed from a surface of the rigid support layer 102 close to the flexible display panel 101 to a surface of the rigid support layer away from the flexible display panel 101. Specifically, the groove 1021 may be formed on the surface of the rigid support layer 102 facing the flexible display panel 101 through an etching process, which may adopt wet etching or dry etching.
Wherein the grooves 1021 are located in the folded region 100a adjacent to two opposite first side edges of the non-folded region 100b, or coincide with a boundary between the non-folded region 100b and the folded region 100 a; a second side edge of the groove 1021 connecting the two first side edges is located in the folding area 100a, or coincides with a boundary of the foldable display device 100.
As an example, the rigid support layer 102 is a glass substrate. Two opposite first sides of the groove 1021 adjacent to the non-folded region 100b coincide with the boundary between the non-folded region 100b and the folded region 100a, and the first sides extend along the extension direction of the folded region 100a to the boundary of the rigid support layer 102.
The thickness of the rigid support layer 102 corresponding to the non-folding region 100b ranges from 100 μm to 200 μm, and the thickness of the rigid support layer 102 corresponding to the folding region 100a ranges from 30 μm to 70 μm. Within this range, the portion of the rigid support layer 102 corresponding to the folding area 100a is made of ultra-thin glass, and has good stiffness and good flexibility. Illustratively, the thickness of the rigid support layer 102 corresponding to the non-folding region 100b is 100 μm, and the thickness of the rigid support layer 102 corresponding to the folding region 100a is 30 μm.
In the embodiment of the present invention, the flexible expansion material 103 filled in the groove 1021 may be an organic material with a better thermal expansion property, so as to ensure the bending property of the foldable display device 100. Specifically, the linear expansion coefficient of the flexible expansion material 103 is in the range of 100 × 10-6/℃～400×10-6/℃。
In an embodiment of the present invention, the flexible expansion material 103 includes at least one of silicone rubber, neoprene rubber, styrene-butadiene rubber, and chlorinated polyethylene rubber. Of course, the organic material may be selected from other organic materials having a linear expansion coefficient within the above range.
Referring to fig. 2 and 4, the foldable display device 100 further includes an adhesive layer 104, the flexible display panel 101 and the rigid support layer 102 are attached by the adhesive layer 104, and the adhesive layer 104 is a transparent optical adhesive, which is generally an organic material and can be selected from a conventional optical adhesive material, which is not limited herein. The thickness of the flexible intumescent material 103 is equal to the depth of the groove 1021, such that the surface of the flexible intumescent material 103 away from the bottom of the groove 1021 is coplanar with the upper surface of the rigid support layer 102. And, the width of the flexible expansion material 103 is equal to the width of the groove 1021. In this way, the flexible expansion material 103 is in close contact with the adhesive layer 104 and the grooves 1021, and no bubble or hollow phenomenon occurs during the expansion and contraction (recovery) of the flexible expansion material 103.
Because the flexible expansion material 103 generates a transverse acting force and a longitudinal acting force after being heated and expanded, the transverse acting force generated after the flexible expansion material 103 is heated and expanded is mainly utilized, and the longitudinal acting force generated after the flexible expansion material is expanded needs to be reduced as much as possible so as to prevent the flexible display panel 101 from being damaged. Therefore, it is required that the width of the flexible intumescent material 103 in the direction of the non-folding region 100b pointing towards the folding region 100a is larger than the thickness of the flexible intumescent material 103 in the direction of the flexible display panel 101 pointing towards the rigid support layer 102. Specifically, the width of the flexible expansion material 103 may be set within the range of the width of the folding region 100a of the foldable display device 100 mentioned above, and for example, the width of the flexible expansion material 103 may be 2 mm, 5 mm, 10mm, 20 mm, 50 mm, 100 mm or 200 mm, and may be specifically determined according to the condition of plastic deformation of the folding region of the flexible display panel. Due to the design, the transverse acting force generated after the flexible expansion material 103 expands under heat is far larger than the longitudinal acting force, and the bonding layer 104 above the flexible expansion material 103 is made of a flexible organic material, so that the longitudinal acting force generated after the flexible expansion material 103 expands can be relieved, and the flexible display panel 101 cannot be affected.
It should be noted that the direction in which the non-folding region 100b points to the folding region 100a in the embodiment of the present invention refers to the direction in which the non-folding region 100b points to the folding region 100a in the fully unfolded state of the foldable display device 100.
The working principle of the flexible expansion material of the embodiment of the present invention capable of improving the plastic deformation (crease) of the folding area of the flexible display panel is described as follows.
It is understood that, in the case of normal use of the flexible display panel 101 after lighting, a certain amount of heat is generated, and the heat is conducted to the position of the flexible expansion material 103 along with the film layer. The lighting state of the flexible display panel 101 is a display state.
Setting the environment temperature parameter of the flexible expansion material 103 when the flexible display panel 101 is not lighted as a first temperature parameter, setting the environment temperature parameter of the flexible expansion material 103 after the flexible display panel 101 is lighted for a preset time as a second temperature parameter, wherein the second temperature parameter is greater than the first temperature parameter. The preset time may be 10 seconds, 30 seconds, 1 minute, 5 minutes, or 10 minutes, which is not limited herein.
Referring to fig. 2, 5 and 6, the flexible intumescent material 103 is in a first state at the first temperature parameter and in a second state at the second temperature parameter. Wherein the flexible intumescent material 103 expands when the flexible intumescent material 103 transitions from the first state to the second state. When the flexible intumescent material 103 transitions from the second state to the first state, the flexible intumescent material 103 returns to its original shape. It can also be said that the first state of the flexible intumescent material 103 is the normal state and the second state of the flexible intumescent material 103 is the expanded state.
Specifically, the first temperature parameter may be room temperature (25 ℃), and the second temperature parameter may range from 26 ℃ to 60 ℃, and the second temperature parameter may be, for example, 28 ℃, 30 ℃, 35 ℃, 40 ℃, 45 ℃, or 50 ℃.
In the fully unfolded state of the foldable display device 100, after the flexible display panel 101 is lighted for a preset time, the flexible expansion material 103 is transformed from the first state to the second state. The lateral forces generated by the expansion of the flexible intumescent material 103 act on the opposing sidewalls of the groove 1021 adjacent the non-folded region 100 b. The rigid support layer 102 includes a first portion 1022 corresponding to the non-folding area 100b and a second portion 1023 corresponding to the folding area 100a, and the first portion 1022 on both sides of the folding area 100a is connected by the second portion 1023, so that the rigid support layer 102 is deformed in a first direction under the transverse force, wherein the first direction is opposite to the folding direction of the foldable display device 100. Since the first portion 1022 of the rigid support layer 102 is rigid, it is actually the second portion 1023 of the rigid support layer 102 that deforms in the first direction.
That is, when the flexible intumescent material 103 is in a first state, the second portion 1023 of the rigid support layer 102 is in a first configuration, i.e. a flat state; when the flexible intumescent material 103 is in a second state, the second portion 1023 of the rigid support layer 102 is in a second configuration, i.e. a bent state. When second portion 1023 transitions from the first configuration to the second configuration, second portion 1023 deforms in the first direction.
Since the second portion 1023 is bent and deformed in the first direction, the flexible expansion material 103 in the recess 1021 is also bent and deformed in the first direction.
Referring to fig. 7, as an example, in a fully unfolded state of the foldable display device 100, when the flexible expansion material 103 is in the first state, a portion of the adhesive layer 104 corresponding to the folding area 100a is in a third state, that is, a surface facing the flexible display panel 101 is a curved surface bending in a folding direction, and is plastically deformed; a portion of the flexible display panel 101 corresponding to the folding region 100a is in a fourth configuration, i.e., a bending state deformed toward the folding direction, and is plastically deformed.
Referring to fig. 8, when the flexible expansion material 103 is in the second state, when the flexible expansion material 103 and the rigid support layer 102 are bent and deformed, a horizontal component and a vertical component are generated on the portion of the adhesive layer 104 corresponding to the folding area 100a and the portion of the flexible display panel 101 corresponding to the folding area 100a, so that a certain deformation occurs. That is, a portion of the adhesive layer 104 corresponding to the folding region 100a is in a fifth configuration, i.e., a bent state or a flat state deformed to the first direction; a portion of the flexible display panel 101 corresponding to the folding area 100a is in a sixth configuration, i.e., a bent state or a flat state deformed to the first direction.
Referring to fig. 7 and 8, when the flexible expansion material 103 expands by heat, the portion of the adhesive layer 104 corresponding to the folding area 100a is transformed from the third configuration to the fifth configuration. Meanwhile, the portion of the flexible display panel 101 corresponding to the folding area 100a is transformed from the fourth configuration to the sixth configuration.
Wherein, when the flexible intumescent material 103 is transformed from the first state to the second state, the amount of deformation of the flexible intumescent material 103 in a second direction, which is the direction in which the non-folded region 100b points towards the folded region 100a, is a first threshold value.
When the portion of the adhesive layer 104 corresponding to the folding area 100a is transformed from the third configuration to the fifth configuration, the deformation amount of the portion of the adhesive layer 104 corresponding to the folding area 100a in the second direction is greater than 0 and less than or equal to the first threshold value.
When the portion of the flexible display panel 101 corresponding to the folding area 100a is transformed from the fourth configuration to the sixth configuration, the amount of deformation of the portion of the flexible display panel 101 corresponding to the folding area 100a in the second direction is greater than 0 and less than or equal to the first threshold.
The rigid support layer 102 is made of glass, the flexible expansion material 103 is made of silicone rubber, and the width of the flexible expansion material 103 in the second direction is 10 mm. The linear expansion coefficient of the glass material is 4 multiplied by 10 at room temperature-6The linear expansion coefficient of the silicone rubber is 270X 10/. degree.C-6V. C. When the flexible display panel 101 rises to 35 ℃ from room temperature (25 ℃) after use, the amount of deformation (first threshold) of the flexible expansion material 103 in the second direction is approximately:
10mm×10℃×270×10-6/℃＝0.027mm
the above calculations ignore dimensional changes in glass due to the low coefficient of linear expansion of glass.
The flexible expansion material 103 can make the rigid support layer 102 bend and deform, and since the portion of the flexible display panel 101 corresponding to the folding area 100a is subjected to a tensile stress in the second direction by the lower film layer, so as to generate a tensile deformation in the second direction, the deformation amounts of the adhesive layer 104 and the flexible display panel 101 in the second direction are both close to 0.027mm, so that a crease (plastic deformation) generated by bending can be "straightened", so as to reduce the crease.
In other embodiments, the width of the flexible intumescent material 103 in the second direction may be adjusted or other flexible intumescent materials may be used to achieve different amounts of thermal deformation to match the plastic deformation caused by bending.
Referring to fig. 9, as an example, in the fully unfolded state of the foldable display device 100, when the flexible expansion material 103 is in the first state, the portion of the adhesive layer 104 corresponding to the folding area 100a is in the third state, i.e., the flat state, and is not plastically deformed; the portion of the flexible display panel 101 corresponding to the folding area 100a is in the fourth configuration, i.e. the flat state, and is not plastically deformed.
Referring to fig. 10, when the flexible intumescent material 103 is in the second state, when the flexible intumescent material 103 is bent and deformed, the adhesive layer 104 on the flexible intumescent material 103 and the portion of the flexible display panel 101 attached to the rigid support layer 102 through the adhesive layer 104, which corresponds to the folding area 100a, are both bent and deformed in the first direction to some extent. That is, a portion of the adhesive layer 104 corresponding to the folding region 100a is in a fifth form, i.e., a bent state deformed toward the first direction; a portion of the flexible display panel 101 corresponding to the folding area 100a is in a sixth configuration, i.e., a bent state deformed toward the first direction.
Referring to fig. 9 and 10, when the flexible expansion material 103 is expanded by heat, the portion of the adhesive layer 104 corresponding to the folding area 100a is transformed from the third configuration to the fifth configuration, i.e., the portion of the adhesive layer 104 corresponding to the folding area 100a is deformed in the first direction. Meanwhile, the portion of the flexible display panel 101 corresponding to the folding area 100a is transformed from the fourth configuration to the sixth configuration, that is, the portion of the flexible display panel 101 corresponding to the folding area 100a is deformed in the first direction.
According to the scheme of the embodiment, not only the flexible display panel 101 is not damaged, but also the adhesive layer 104 and the part of the flexible display panel 101 corresponding to the folding area 100a are both subjected to bending deformation opposite to the folding direction of the foldable display device, so that the bending fatigue of the film layer in a single direction can be relieved, and the plastic deformation of the organic material can be delayed.
It should be noted that the deformation of the rigid support layer 102 in the embodiment of the present invention is less than 1.5%, and the deformation is small and even not easily perceived by naked eyes, so that the visual effect of the foldable display device is not affected.
According to the foldable display device provided by the invention, the groove corresponding to the folding area is formed on the surface of the rigid support layer facing to one side of the flexible display panel, the groove is filled with the flexible expansion material, the flexible expansion material is expanded by utilizing heat generated after the flexible display panel is lightened, so that the rigid support layer is bent and deformed in the direction opposite to the folding direction of the foldable display device, the flexible display panel attached to the rigid support layer can be tensioned by the bending deformation of the rigid support layer, the part of the flexible display panel corresponding to the folding area is also correspondingly deformed, and the plastic deformation caused by bending is matched, so that the problem of crease marks of the folding area of the flexible display panel is solved.
The above embodiments of the present invention are described in detail, and the principle and the implementation of the present invention are explained by applying specific embodiments, and the above description of the embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A foldable display device, characterized in that the foldable display device has a folding area and non-folding areas at two opposite sides of the folding area, the foldable display device comprises a flexible display panel and a rigid support layer arranged at the back of the flexible display panel;
the surface of one side, facing the flexible display panel, of the rigid supporting layer is provided with a groove, the groove is located in the folding area, and the groove is filled with flexible expansion materials.
2. The foldable display device of claim 1, wherein the thickness of the flexible intumescent material is equal to the depth of the groove in a direction of the flexible display panel towards the rigid support layer; the width of the flexible intumescent material is equal to the width of the groove in the direction of the non-folded region towards the folded region.
3. The foldable display device of claim 2, wherein the recess comprises two oppositely disposed first side edges adjacent to the non-folding area, the first side edges extending along the extension direction of the folding area to the boundary of the rigid support layer; wherein the thickness range of the rigid support layer corresponding to the non-folding area is 100-200 μm, and the thickness range of the rigid support layer corresponding to the folding area is 30-70 μm.
4. The foldable display device of claim 3, wherein a width of the flexible intumescent material in a direction of the non-folding region pointing towards the folding region is larger than a thickness of the flexible intumescent material in a direction of the flexible display panel pointing towards the rigid support layer.
5. The foldable display device of claim 1, wherein the flexible intumescent material has a linear expansion coefficient in the range of 100 x 10-6/℃～400×10-6The linear expansion coefficient of the rigid supporting layer is within the range of 0.5 multiplied by 10 DEG C-6/℃～50×10-6/℃。
6. The foldable display device of claim 5, wherein the flexible intumescent material comprises at least one of silicone rubber, neoprene rubber, styrene butadiene rubber, and chlorinated polyethylene rubber.
7. The foldable display device according to any one of claims 1 to 6, wherein the ambient temperature parameter of the flexible expansion material when the flexible display panel is not lit is a first temperature parameter, and the ambient temperature parameter of the flexible expansion material after the flexible display panel is lit for a preset time is a second temperature parameter;
the flexible intumescent material is in a first state at the first temperature parameter and in a second state at the second temperature parameter;
wherein the second temperature parameter is greater than the first temperature parameter, the flexible intumescent material expanding when the flexible intumescent material transitions from the first state to the second state.
8. The foldable display device of claim 7, wherein in a fully unfolded state of the foldable display device, the flexible intumescent material deforms in a first direction when transitioning from the first state to the second state, the first direction being opposite to a folding direction of the foldable display device;
when the flexible intumescent material is in a first state, the portion of the rigid support layer corresponding to the fold region is in a first configuration; when the flexible intumescent material is in a second state, the portion of the rigid support layer corresponding to the fold region is in a second configuration;
when the portion of the rigid support layer corresponding to the folding area is transformed from the first configuration to the second configuration, the portion of the rigid support layer corresponding to the folding area is deformed in the first direction.
9. The foldable display device of claim 8, further comprising an adhesive layer, wherein the flexible display panel and the rigid support layer are attached by the adhesive layer;
when the flexible expansion material is in the first state, the part of the adhesive layer corresponding to the folding area is in a third state, and the part of the flexible display panel corresponding to the folding area is in a fourth state;
when the flexible expansion material is in the second state, the part of the adhesive layer corresponding to the folding area is in a fifth state, and the part of the flexible display panel corresponding to the folding area is in a sixth state;
wherein when the portion of the adhesive layer corresponding to the folding area is transformed from the third form to the fifth form, the portion of the adhesive layer corresponding to the folding area is deformed in the first direction;
when the part of the flexible display panel corresponding to the folding area is converted from the fourth state to the sixth state, the part of the flexible display panel corresponding to the folding area is deformed towards the first direction.
10. The foldable display device of claim 9, wherein when the flexible intumescent material transitions from the first state to the second state, an amount of deformation of the flexible intumescent material in a second direction is a first threshold, the second direction being a direction in which the non-folding region points towards the folding region;
when the part of the adhesive layer corresponding to the folding area is converted from the third form to the fifth form, the deformation amount of the part of the adhesive layer corresponding to the folding area in the second direction is greater than 0 and less than or equal to the first threshold value;
when the part of the flexible display panel corresponding to the folding area is converted from the fourth state to the sixth state, the deformation amount of the part of the flexible display panel corresponding to the folding area in the second direction is greater than 0 and less than or equal to the first threshold value.
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