CN108281466B - Rollable display module and rollable display device - Google Patents
Rollable display module and rollable display device Download PDFInfo
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- CN108281466B CN108281466B CN201810052523.9A CN201810052523A CN108281466B CN 108281466 B CN108281466 B CN 108281466B CN 201810052523 A CN201810052523 A CN 201810052523A CN 108281466 B CN108281466 B CN 108281466B
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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
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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
- H10K59/12—Active-matrix OLED [AMOLED] displays
Abstract
The invention discloses a rollable display module and a rollable display device. The rollable display module comprises: a flexible display panel including a flexible substrate and a display device layer on the flexible substrate; the gravity layer is positioned on one side of the flexible substrate, which is far away from the display device layer; wherein the density of the gravity layer is greater than the density of the flexible display panel. Gravity layer density is big, weight is big, when the display module assembly that can curl expandes the state, the gravity layer can keep good flat state, the gravity layer can apply the effort of perpendicular to flexible display panel face direction to flexible display panel because self gravity, make flexible display panel keep flat state, prevent that the frivolous flexible display panel of weight from taking place freely to curl owing to the inertia that the state of curling produced, guarantee the stability of expansion state, avoided flexible display panel to take place to curl or reach the limit of buckling and damage, improve the performance stability of the display module assembly that can curl.
Description
Technical Field
The invention relates to the technical field of display, in particular to a rollable display module and a rollable display device.
Background
With the application of display technology in intelligent wearing and other portable electronic devices, the display device in the prior art not only pursues display effects such as high resolution, high contrast, high screen ratio, etc., but also has diversified requirements for the appearance of the display device, such as a special-shaped display panel, a rollable display panel, etc. A rollable display panel is a flexible display panel, and future flexible displays will be developed towards being foldable and rollable. It can be understood that the thinner the thickness of the flexible display panel, the easier it is to achieve the folding and rolling, so the thickness of the flexible display panel inevitably develops toward the ultra-thin direction.
For an ultra-thin flexible display panel, when the flexible display panel is used for displaying in an unfolded state, due to the action of curled inertia, self stress or external force, curling or folding is easy to occur, and even the bending limit of the flexible display panel is exceeded, so that the flexible display panel is damaged, and the use performance of the flexible display panel is affected.
Therefore, it is an urgent problem in the art to provide a rollable display module and a rollable display device, which are not easy to curl when the flexible display panel is in an unfolded state, and improve the performance stability of the rollable display module.
Disclosure of Invention
In view of this, the present invention provides a rollable display module and a rollable display device, which solve the technical problem of improving the performance stability of the rollable display module.
In a first aspect, to solve the above technical problem, the present invention provides a rollable display module, including:
a flexible display panel including a flexible substrate and a display device layer on the flexible substrate;
the gravity layer is positioned on one side of the flexible substrate, which is far away from the display device layer;
wherein the density of the gravity layer is greater than the density of the flexible display panel.
In a second aspect, to solve the above technical problem, the present invention provides a rollable display device including any one of the rollable display modules provided in the present invention.
Compared with the prior art, the rollable display module and the rollable display device have the advantages that:
according to the rollable display module and the rollable display device, the gravity layer is arranged below the flexible display panel, and the density of the gravity layer is greater than that of the flexible display panel. When the flexible display panel is in an unfolded state, the gravity layer has high density and high weight, the gravity layer is not easy to freely curl due to the curling inertia, the gravity layer can keep a good flat state, the gravity layer in the flat state can apply acting force vertical to the surface direction of the flexible display panel to the flexible display panel due to the self gravity action, the contact part of the flexible display panel and the gravity layer can be directly acted by the action force, this effort can be confronted flexible display panel self's inertial force and can be made flexible display panel keep the flat state, prevents that the frivolous flexible display panel of weight from taking place freely to curl owing to the inertia that the crimp state produced, guarantees the stability of expansion state, has avoided flexible display panel to take place to curl or reach the limit of buckling and damage, improves the performance stability of the display module that can curl. Meanwhile, when the unfolding state of the flexible display panel is used for displaying, the flexible display panel can reach a good unfolding state, and good use experience can be provided. When flexible display panel crimped state, the gravity layer was curled in the inboard, realized supporting and protecting flexible display panel, can guarantee that flexible display panel forms the arc and curls, prevents that flexible display panel from taking place to die.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a film structure diagram of a rollable display module according to an embodiment of the present invention;
fig. 2 is a film structure diagram of an alternative embodiment of a rollable display module according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a curling state of the rollable display module according to the embodiment of the invention;
FIG. 4 is a schematic top view of a rollable display module according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of the rollable display module shown in FIG. 4 at position A-A';
fig. 6 is a schematic diagram illustrating an alternative implementation of the curling state of the rollable display module according to an embodiment of the invention;
FIG. 7 is a diagram of a film structure of another alternative embodiment of a rollable display module according to an embodiment of the present invention;
FIG. 8 is a schematic top view of an alternative embodiment of a rollable display module according to an embodiment of the present invention;
FIG. 9 is a schematic view of the rollable display module shown in FIG. 8 in a vertical use state;
FIG. 10 is a diagram of a film structure of another alternative embodiment of a rollable display module according to an embodiment of the present invention;
FIG. 11 is a diagram illustrating a film structure of another alternative embodiment of a rollable display module according to an embodiment of the present invention;
FIG. 12 is a schematic top view of an alternative embodiment of a rollable display module according to an embodiment of the present invention;
FIG. 13 is a schematic cross-sectional view of the rollable display module shown in FIG. 12 at position B-B';
fig. 14 is a schematic view of a rollable display device according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a film structure diagram of a rollable display module according to an embodiment of the present invention. Fig. 2 is a film structure diagram of an alternative embodiment of the rollable display module according to the embodiment of the invention, and fig. 3 is a schematic diagram of a rolled state of the rollable display module according to the embodiment of the invention.
As shown in fig. 1, the rollable display module includes: a flexible display panel 100, the flexible display panel 100 comprising a flexible substrate 101 and a display device layer 102 located over the flexible substrate 101; the gravity layer 103 is positioned on one side of the flexible substrate 101, which is far away from the display device layer 102; wherein the density of the gravity layer 103 is greater than the density of the flexible display panel 100.
As shown in FIG. 2, the display device layer 102 of the present invention includes a plurality of light emitting devices1021, the light emitting device 1021 includes an anode 10211, a light emitting layer 10212, and a cathode 10213, which are sequentially stacked. The light emitting device may be a top emission type structure or a bottom emission type structure, and exemplarily, a top emission type light emitting device structure is illustrated in fig. 2 as an example. In this structure, the anode 10211 is a reflective electrode, which is usually made of a metal material, and may be made of Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, or a mixture thereof. For example, anode 10211 can comprise a structure of ITO-Ag-ITO (i.e., indium tin oxide-silver-indium tin oxide); the light emitting layer 10212 may include a red light emitting layer, a green light emitting layer, and a blue light emitting layer, but the present invention is not limited thereto; the cathode 10213 is a transparent electrode, and may include Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), zinc oxide (ZnO) or indium oxide (In)2O3) And the like. The anode can effectively reflect light emitted from the light emitting layer 10212 to a light emitting side to improve light emitting efficiency, and holes injected from the anode and electrons injected from the cathode are combined in the light emitting pixel layer to generate excitons, which fall from an excited state to a ground state and generate light. The light emitting device 1021 may further include one or more of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer. A hole injection layer and/or a hole transport layer may be disposed between the anode 10211 and the light emitting layer 10212. An electron injection layer and/or an electron transport layer may be disposed between the cathode 10213 and the light emitting layer 10212. The flexible substrate 101 includes an array substrate layer 1011, and the array substrate layer 1011 includes a plurality of thin film transistors T controlling switching of the light emitting devices, wherein the thin film transistors T include an active layer C, a gate electrode G, a source electrode S, and a drain electrode D. The anode 10211 may be connected to a source S or a drain D of the thin film transistor T, for example, the anode and the drain D in fig. 2, according to the type of the transistor. Fig. 2 only shows a top-gate thin film transistor, but the thin film transistor on the array substrate layer may also be a bottom-gate structure, which is not described herein. A thin film encapsulation layer 105 is also disposed over the display device layer 102, and the thin film encapsulation layer 105 covers the display device layer 102. The thin film encapsulation layer 105 may be a combined encapsulation of multiple organic and inorganic thin films, for example, may be alternating layers of organic and inorganic thin filmsAnd (4) stacking. The organic film is usually a polymer material such as epoxy, phenolic, polyester, etc.; the inorganic thin film may be made of silicon nitride, silicon oxynitride, metal oxide, or the like. The thin film packaging layer can effectively prevent water and oxygen from corroding the light-emitting device, so that the service life of the light-emitting device is prolonged, the light-emitting device is thin, and the light-emitting device has good bending or curling performance. An upper protective layer may also be disposed on top of the thin film encapsulation layer 105.
As shown in fig. 3, the rollable display module can be rolled, and the gravity layer 103, the flexible substrate 101 and the display device layer 102 are stacked in the rollable display module. In the rolled state, the gravity layer 103 is rolled (or bent) on the inside, while the display device layer 102 is rolled on the outside. The gravity layer 103 has a certain thickness, and after the gravity layer 103 is curled (or bent), the flexible substrate 101 and the display device layer 102 can be curved and curled outside, so that the display device layer 102 and the flexible substrate 101 can be prevented from being folded and dead, and the use performance of the curled display module can be influenced.
When a flexible display panel which is light and thin in weight is rolled and then flattened again, the flexible display panel can be freely rolled due to the inertia of the flexible display panel. According to the rollable display module provided by the invention, the gravity layer is arranged below the flexible display panel, and the density of the gravity layer is greater than that of the flexible display panel. When the flexible display panel is in an unfolded state, the gravity layer has high density and high weight, the gravity layer is not easy to freely curl due to the curling inertia, the gravity layer can keep a good flat state, the gravity layer in the flat state can apply acting force vertical to the surface direction of the flexible display panel to the flexible display panel due to the self gravity action, the contact part of the flexible display panel and the gravity layer can be directly acted by the action force, this effort can be confronted flexible display panel self's inertial force for flexible display panel keeps the flattening state, prevents that the frivolous flexible display panel of weight from taking place freely to curl owing to the inertia that the state of curling produced, guarantees the stability of flexible display panel expansion state, has avoided flexible display panel to take place to curl or reach the limit of buckling and damage, improves the performance stability of the display module assembly that can curl. Meanwhile, when the flexible display panel is in an unfolded state and used for displaying, the flexible display panel can achieve a good flat state, and good use experience and viewing effect can be provided. When flexible display panel crimped state, the gravity layer was curled in the inboard, realized supporting and protecting flexible display panel, can guarantee that flexible display panel forms the arc and curls, prevents that flexible display panel from taking place to die.
In some optional embodiments, in the rollable display module provided by the invention, the density of the flexible display panel is 0.8-1.2 g/cm3The density of the gravity layer is more than or equal to 10g/cm3. In the embodiment, the density of the flexible display panel is small, the ultrathin flexible display panel can be realized, the density of the gravity layer arranged below the flexible display panel is about 8-12.5 times of that of the flexible display panel, the density of the gravity layer is far greater than that of the flexible display panel, when the flexible display panel is in an unfolded state, the acting force applied to the flexible display panel by the gravity layer can enable the flexible display panel to be in a good unfolded state, the flexible display panel which is light and thin in weight is prevented from being freely curled due to inertia generated in a curled state, and the stability of the unfolded state of the flexible display panel is ensured.
The gravity layer can be made of various structures and materials, for example, the gravity layer can be a whole layer under the flexible display panel, or the gravity layer can include a plurality of gravity units. The material of which the gravity layer is made can comprise a metal material with higher density or a polymer material. When the gravity layer comprises the polymer material, the flexibility of the gravity layer can be increased due to the soft characteristic of the polymer. Embodiments of the gravity layer structure and the fabrication materials of the present invention will be illustrated below.
In some optional embodiments, referring to fig. 4 and 5, fig. 4 is a schematic top view of a rollable display module according to an embodiment of the present invention, and fig. 5 is a schematic top view of the rollable display module shown in fig. 4
Schematic cross-sectional view at position A-A'. As shown in fig. 4, the gravity layer 103 includes a plurality of gravity units 1031 sequentially arranged along a first direction a, the first direction a is parallel to the plate surface of the flexible display panel 100, and the density of the gravity units 1031 is greater than that of the flexible display panel 100. As shown in fig. 5, the gravity layer 103 is located on a side of the flexible substrate 101 away from the display device layer 102, and the gravity layer 103 includes a plurality of gravity units 1031. In this embodiment, the plurality of gravity units 1031 are disposed below the flexible display panel 100, and the gravity action of each gravity unit ensures that the flexible display panel 100 can be well flattened when in the unfolded state, and is not easily curled, thereby ensuring the stability of the unfolded state of the flexible display panel. Meanwhile, each gravity unit 1031 may be spaced apart by a certain distance, which is equivalent to saving the manufacturing material of the gravity layer when manufacturing the gravity layer, and saving the manufacturing cost of the rollable display module. Simultaneously, the flexibility of curling of display module assembly that can curl has been improved.
In this embodiment, fig. 6 is a schematic diagram of an alternative implementation manner of the curled state of the rollable display module according to an embodiment of the present invention, and as shown in fig. 6, when the rollable display module is curled, an extending direction of an axis of the curling of the flexible display panel (i.e., a direction perpendicular to the paper surface in the view shown in fig. 6) is the same as the first direction a of the extension of the gravity unit 1031 in fig. 4. In another case, when the rollable display module achieves the rolling, the extending direction of the axis of the rolling of the flexible display panel may also be a second direction b in fig. 4, and the second direction b intersects with the extending first direction a of the gravity unit 1031.
The material for making the gravity unit 1031 in this embodiment includes a metal material, for example, a dense metal such as tungsten or iron, or an alloy material containing a metal such as tungsten or iron. The gravity unit 1031 can be made of a single metal material only, or made of two or more metal materials, or made of an alloy material, the gravity unit made of metal or alloy material is adopted, the heat conduction performance of the metal or alloy material is good, the gravity unit can be favorable for heat conduction of the flexible display panel, when the flexible display panel is in a long-time working state, the heat generated by the display device can be still dissipated in time, the damage caused by the fact that the heat of the display device cannot be dissipated in time is avoided, the service life of the display device is ensured, and the performance stability of the flexible display panel is improved. The gravity cell 1031 is made of a material including a metal material and other non-metal materials, for example, a polymer material, and the polymer material is doped with metal particles or alloy particles to form a gravity layer.
Fig. 7 is a film structure diagram of another alternative implementation of the rollable display module according to the embodiment of the present invention, as shown in fig. 7, a gravity layer 103 includes a plurality of gravity units 1031, and the material for manufacturing the gravity units 1031 includes a polymer material J and metal particles M, which in this implementation is equivalent to a structure formed by doping metal particles with a higher density in the polymer material to form the gravity layer. The polymer material can be polyester, polyethylene, optical cement, pressure-sensitive adhesive or other film materials, and the metal particles can be tungsten, iron or other high-density metal or metal alloy particles. In the embodiment, the gravity layer is made by doping metal particles in the polymer material, so that the density of the gravity layer is greater than that of the flexible display panel, and the flexible display panel can keep a good flattening state through the gravity action of the gravity layer when the rollable display module is in an unfolding state. In the embodiment, the gravity layer is manufactured by doping metal particles in the polymer material, and the polymer material has the soft characteristic, so that the flexibility of the gravity layer can be increased, and the overall flexibility of the rollable display module is further enhanced. In addition, the thickness of the rollable display module can not be increased by doping metal particles in the polymer material to manufacture the gravity layer, so that the flexibility of the rollable display device is further improved. Meanwhile, metal or alloy particles are doped into the polymer material to form a gravity layer, the metal or alloy material is good in heat conduction performance, the gravity layer can be beneficial to heat conduction of the flexible display panel, when the flexible display panel is in a long-time working state, heat generated by the display device can be still dissipated in time, damage caused by the fact that the heat of the display device cannot be dissipated in time is avoided, the service life of the display device is guaranteed, and the performance stability of the flexible display panel is improved. In addition, as the metal or the metal particles are infiltrated into the polymer material, the polymer has lower elastic modulus and stronger impact resistance, and can effectively protect the flexible display panel from being damaged to the outside. Optionally, one side of the flexible substrate, which is away from the display device layer, may further include a lower protective film, where the lower protective film may be attached to the surface of the flexible substrate through an optical adhesive or a pressure-sensitive adhesive, and since the optical adhesive or the pressure-sensitive adhesive is likely to creep when being bent or curled and the recovery performance of the optical adhesive or the pressure-sensitive adhesive is affected, a gravity layer is made by infiltrating metal or metal particles into the optical adhesive or the pressure-sensitive adhesive, so that the recovery performance of the optical adhesive or the pressure-sensitive adhesive can be effectively improved, and the bending resistance or curling resistance of.
Further, in some optional embodiments, fig. 8 is a schematic top view of an optional embodiment of the rollable display module according to an embodiment of the present invention, as shown in fig. 8, at least one connection portion 1032 is disposed between two adjacent gravity units 1031, two ends of the connection portion 1032 are respectively connected to the two gravity units 1031, and a tensile strength of the connection portion 1032 is greater than a tensile strength of the flexible display panel. At least one connecting part is arranged between two adjacent gravity units in the invention, and fig. 7 shows the condition that a plurality of connecting parts are arranged between two adjacent gravity units. The connection portion may have a certain width, or the connection portion may be a linear connection portion.
FIG. 9 is a schematic view of the rollable display module shown in FIG. 8 in a vertical use state. When the rollable display module is in a vertical state as shown in fig. 9, the display module is wholly stretched downwards due to gravity, and the density of the gravity units is greater than that of the flexible display panel, so that the mass of the gravity units is relatively large, and in a region of the flexible display panel between two adjacent gravity units, a part of wires in the flexible display panel may be partially stretched due to the gravity action of the gravity units below, and in severe cases, the wires may be broken or devices may be damaged. As shown in fig. 9, the flexible display panel region R1 is subjected to the gravity action of the lower gravity unit 1031, and the upward gravity action of the flexible display panel region between two adjacent gravity units is larger along the vertical direction d, taking only five gravity units as an example in fig. 9, the uppermost flexible display panel region R2 is subjected to the gravity action of the lower four gravity units 1031 in fig. 9. In the invention, the connecting parts 1032 are arranged between the adjacent gravity units 1031, and the tensile strength of the connecting parts 1032 is greater than that of the flexible display panel 100, so that when the rollable display module is in a sagging state, the connecting parts are used as main stress parts to bear the tensile action of the gravity of the lower gravity unit, thereby reducing the tensile action of the gravity borne by the flexible display panel region between the two adjacent gravity units, avoiding the flexible display panel from being damaged by the tensile action of the gravity, and ensuring the stability of the rollable display module.
In some optional embodiments, fig. 10 is a film structure diagram of another optional embodiment of the rollable display module according to an embodiment of the present invention, and as shown in fig. 10, the rollable display module includes: a flexible display panel 100, the flexible display panel 100 comprising a flexible substrate 101 and a display device layer 102; the gravity layer 103 is positioned on one side of the flexible substrate 101, which is far away from the display device layer 102; the density of the gravitational layer 103 is greater than the density of the flexible display panel 100. The gravity layer 103 is a whole layer, and the rollable display module further includes a lower protective film 104, wherein the lower protective film 104 is located on a side of the gravity layer 103 away from the flexible substrate 101. In the embodiment, the gravity layer is a whole layer, so that the uniformity of the whole film thickness of the rollable display module in the flattening state is ensured, and the structural stability of the rollable display module is good. Meanwhile, the lower protective film is arranged in the embodiment, so that when the display module capable of being curled is used in a flattening state, the impact effect of external force deviating from one side of the display surface of the flexible display panel on the flexible display panel can be reduced by the lower protective film, and the mechanical stability of the display module capable of being curled is guaranteed.
In this embodiment, the material for making the gravity layer 103 includes a metal material, for example, a dense metal such as tungsten or iron, or an alloy material containing a metal such as tungsten or iron. Fig. 11 is a film structure diagram of another alternative embodiment of the crimpable module according to the embodiment of the present invention, and as shown in fig. 11, a polymer material J is doped with metal particles M with a relatively high density to form a structure of the gravity layer 103, and a material for making the gravity layer 103 includes the polymer material J and the metal particles M, where the polymer material may be a thin film material such as polyester, polyethylene, optical cement, or pressure sensitive adhesive, and the metal particles may be particles of metal with a high density such as tungsten, iron, and the like. In the embodiment, the gravity layer is made by doping metal particles in the polymer material, so that the density of the gravity layer is greater than that of the flexible display panel, and the flexible display panel can keep a good flattening state through the gravity action of the gravity layer when the rollable display module is in an unfolding state. Meanwhile, the polymer material has the soft characteristic, the flexibility of the gravity layer can be increased, and the overall flexibility of the display module capable of being curled is further enhanced. In the embodiment, the gravity layer can be favorable for heat conduction of the flexible display panel, when the flexible display panel is in a long-time working state, the heat generated by the display device can be still emitted in time, the phenomenon that the heat of the display device cannot be emitted in time to cause damage is avoided, the service life of the display device is ensured, and the performance stability of the flexible display panel is improved.
In some alternative embodiments, the gravity layer is disposed at least at two ends of the flexible display panel, wherein the two ends are a start end and an end along the rolling direction. Fig. 12 is a schematic top view of another alternative embodiment of the rollable display module according to an embodiment of the present invention, fig. 13 is a schematic cross-sectional view of the rollable display module shown in fig. 12 at a position B-B', and referring to fig. 12 and 13, the gravity layers 103 are disposed only at two ends of the flexible display panel 100, the two ends are respectively a start end Q1 and a tail end Q2 along a rolling direction, that is, when the rollable display module is in a rolled state, an extending direction of the rolling shaft is a direction c shown in fig. 12, in this embodiment, the gravity layers are disposed only at the start end and the tail end of the flexible display panel along the rolling direction, and when the flexible display panel is in a flattened state, the gravity layers disposed at the start end and the tail end exert forces perpendicular to a plate surface direction of the flexible display panel, respectively, the forces can resist an inertia force of the flexible display panel itself, the two end parts of the flexible display panel can not warp due to the inertia of the curling state and even drive the flexible display panel to curl integrally, and the flexible display panel can keep a good flat state. The material for making the gravity layer in this embodiment may be metal or alloy, or metal particles or alloy particles may be added to the polymer material.
It should be noted that, in this embodiment, the size and doping ratio of the metal particles doped in the polymer material are not limited, and the metal particles with a high doping density are doped in the polymer material, so that the density of the gravity layer is greater than that of the flexible display panel, and thus the design of the gravity layer playing a role in preventing the flexible display panel from freely curling is within the protection scope of the present invention.
The invention also provides a rollable display device comprising the rollable display module provided by any embodiment of the invention. Fig. 14 is a schematic view of a rollable display device according to an embodiment of the present invention. According to the rollable display device provided by the invention, the gravity layer is arranged below the flexible display panel, and the density of the gravity layer is greater than that of the flexible display panel. When the flexible display panel is in an unfolded state, the gravity layer has high density and high weight, the gravity layer is not easy to freely curl due to the curling inertia, the gravity layer can keep a good flat state, the gravity layer in the flat state can apply acting force vertical to the surface direction of the flexible display panel to the flexible display panel due to the self gravity action, the contact part of the flexible display panel and the gravity layer can be directly acted by the action force, this effort can be confronted flexible display panel self's inertial force, should be able to make flexible display panel keep the flattening state, prevents that the frivolous flexible display panel of weight from taking place freely to curl owing to the inertia that the curling state produced, guarantees the stability of expansion state, has avoided flexible display panel to take place to curl or reach the limit of buckling and damage, improves the display device's that can curl performance stability.
According to the embodiment, the rollable display module and the rollable display device disclosed by the invention have the following beneficial effects:
according to the rollable display module and the rollable display device, the gravity layer is arranged below the flexible display panel, and the density of the gravity layer is greater than that of the flexible display panel. When the flexible display panel is in an unfolded state, the gravity layer has high density and high weight, the gravity layer is not easy to freely curl due to the curling inertia, the gravity layer can keep a good flat state, the gravity layer in the flat state can apply acting force vertical to the surface direction of the flexible display panel to the flexible display panel due to the self gravity action, the contact part of the flexible display panel and the gravity layer can be directly acted by the action force, this effort can be confronted flexible display panel self's inertial force, can make flexible display panel keep the flattening state, prevents that the frivolous flexible display panel of weight from taking place freely to curl owing to the inertia that the state of curling produced, guarantees the stability of expansion state, has avoided flexible display panel to take place to curl or reach the limit of buckling and damage, improves the performance stability of the display module that can curl. Meanwhile, when the flexible display panel is in an unfolded state and used for displaying, the flexible display panel can achieve a good flat state, and good use experience and viewing effect can be provided. When flexible display panel crimped state, the gravity layer was curled in the inboard, realized supporting and protecting flexible display panel, can guarantee that flexible display panel forms the arc and curls, prevents that flexible display panel from taking place to die.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (8)
1. A rollable display module, comprising:
the flexible display panel comprises a flexible substrate, a display device layer positioned on the flexible substrate and a thin film packaging layer positioned on the display device layer and covering the display device layer;
the gravity layer is positioned on one side, far away from the display device layer, of the flexible substrate and comprises a plurality of gravity units which are sequentially arranged along a first direction, the first direction is parallel to the panel surface of the flexible display panel, at least one connecting part is arranged between every two adjacent gravity units, two ends of each connecting part are respectively connected with the two gravity units, and the tensile strength of each connecting part is greater than that of the flexible display panel;
wherein the density of the gravity layer is greater than the density of the flexible display panel.
2. A rollable display module according to claim 1,
the rollable display module further comprises a lower protective film, and the lower protective film is located on one side, away from the flexible substrate, of the gravity layer.
3. A rollable display module according to claim 1,
the gravity layer is made of tungsten or iron.
4. A rollable display module according to claim 1,
the material for making the gravitational layer comprises a polymer material, wherein the polymer material comprises metal particles.
5. A rollable display module according to claim 4,
the polymeric material comprises polyester, polyethylene, optical glue or pressure sensitive adhesive.
6. A rollable display module according to claim 1,
at least two ends of the flexible display panel are provided with gravity layers, wherein the two ends are respectively a starting end and a tail end along the rolling direction.
7. A rollable display module according to claim 1,
the density of the flexible display panel is 0.8-1.2 g/cm3The density of the gravity layer is more than or equal to 10g/cm3。
8. A rollable display device comprising the rollable display module according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810052523.9A CN108281466B (en) | 2018-01-19 | 2018-01-19 | Rollable display module and rollable display device |
Applications Claiming Priority (1)
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| US20110233557A1 (en) * | 2001-06-20 | 2011-09-29 | Semiconductor Energy Laboratory Co., Ltd. | Light emitting device and method of manufacturing the same |
| CN102969320A (en) * | 2012-12-10 | 2013-03-13 | 京东方科技集团股份有限公司 | Flexible display substrate and preparation method thereof as well as flexible display device |
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| CN106783912A (en) * | 2016-11-11 | 2017-05-31 | 武汉华星光电技术有限公司 | Flexible display panels and flexible display apparatus |
| CN107578707A (en) * | 2017-10-20 | 2018-01-12 | 上海天马微电子有限公司 | Flexible display panels and display device |
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| US20110233557A1 (en) * | 2001-06-20 | 2011-09-29 | Semiconductor Energy Laboratory Co., Ltd. | Light emitting device and method of manufacturing the same |
| CN102969320A (en) * | 2012-12-10 | 2013-03-13 | 京东方科技集团股份有限公司 | Flexible display substrate and preparation method thereof as well as flexible display device |
| CN106025095A (en) * | 2016-06-07 | 2016-10-12 | 武汉华星光电技术有限公司 | Packaging structure of flexible OLED device and display device |
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