CN103177656B - Flexible back plate for flexible display - Google Patents
Flexible back plate for flexible display Download PDFInfo
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- CN103177656B CN103177656B CN201310121957.7A CN201310121957A CN103177656B CN 103177656 B CN103177656 B CN 103177656B CN 201310121957 A CN201310121957 A CN 201310121957A CN 103177656 B CN103177656 B CN 103177656B
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Abstract
The invention relates to a flexible back plate for a flexible display. The flexible back plate comprises a structure layer and a laying layer, wherein the structure layer is of a honeycomb structure with negative Poisson ratio; the laying layer is evenly laid in the central plane of the structure layer; the structure layer is made of shape memory polymers or composite materials; the laying layer is made of carbon fibers; the laying layer is provided with an leading-out terminal provided with two electrodes; when the two electrodes are electrified, the laying layer generates heat to heat the structure layer to enable the structure layer to reach the glass-transition temperature of the material of the structure layer, and exerts an external force to the honeycomb structure to achieve the purpose of deforming the honeycomb, the shape of the honeycomb can be fixed after the heating is stopped, the size is increased in two directions, in this way, the size of the back plate is increased; when the honeycomb structure is in an unidirectional compression, the size is decreased in a plane, in this way, the size of the back plate is decreased; and the honeycomb structure with negative Poisson ratio has double-curvature characteristic. The flexible back plate has the following characteristics of being bendable, having double curvature, impact resistance and anti-shock performance, being capable of being driven intelligently, and being light and beautiful.
Description
Technical field
The present invention relates to a kind of flexible back plate of flexible display.
Background technology
Flexible display is as the display device of a new generation, be convenient for carrying because flexible display has, lightweight, the advantage such as should not to break into pieces, in prospects that is widely used such as mobile phone, personal digital assistant (PDA), digital camera, car-mounted display, notebook computer, wall hung television and military fields.Major technical challenge is the brilliant substrate of manufacturing flexible thin-film electro now.
In the prior art, for flexible display, in flexible display, the material of flexible base, board generally uses as macromolecular materials such as poly-phthalimides (Polyimide), use this flexible base, board, in radius-of-curvature number millimeter degree, plastic yield (permanent strain) can't occur, if but be bent to the scope exceeding elastic deformation and will cause permanent strain, and crushed element becomes white opacity shape, and then affect its display quality.In addition, when carrying out bending to flexible base, board, attached electron device is on flexible substrates squeezed or stretches, after repeatedly bending distortion, flexible base, board can due to stress fatigue, make the electron device damaged that is positioned on flexible base, board and cause circuit to damage, thus causing dysfunction.
Negative poisson's ratio material is a kind of emerging investigation of materials direction.Its characteristic is: negative poisson's ratio material, when being subject to stretching, can expand perpendicular to tension direction, instead of common contraction occurs; When being compressed, material is shrinking perpendicular to stress direction, instead of common expansion; When being subject to bending, can form a hollow depression belt (hyperbolicity characteristic) in the inside of material, this can improve the back-supported power of material.This structure also has lightweight, high specific strength, high specific stiffness, high shear modulus, shock resistance, the comprehensive function such as heat insulation simultaneously.The new material that the property of negative poisson's ratio material makes it become a class gradually to merit attention, has wide application space.
Simultaneously along with discovery and the use of novel intelligent material shape memory polymer, we find to utilize this large deformation shape-memory material can well solve some problem of the manufacture view of flexible display substrate.When shape-memory polymer is below transition temperature, there is the essential characteristic of polymkeric substance; Can have very large distortion time more than transition temperature, and this distortion is fixable, such distortion simultaneously can recover again completely; The distortion of shape memory polymer material can carry out intelligent drives according to design; Its polymeric material has the mechanical property of the excellence such as high specific strength, high specific stiffness that resin-based polymeric material has simultaneously.
Summary of the invention
Based on above weak point, the present invention discloses a kind of flexible back plate of flexible display, it make use of the Negative poisson's ratio of special honeycomb and the SME of novel intelligent material shape memory polymer and compound substance thereof, when changing extraneous thermal effect factor and reaching more than the glass transition temperature of material or melting transition temperature, the change of size or the change of shape can be there is, under the condition reducing temperature, new shape can be fixed again, after again making material reach its transition temperature, the main body of supporting member and support can automatically revert to its initial shape.And said process can repeat.
The technology used in the present invention is as follows:
A kind of flexible back plate of flexible display, comprise structural sheet and lay layer, structural sheet adopts negative poisson ' s ratio honeycomb, lay layer to be laid in uniformly in the central plane of structural sheet, structural sheet adopts shape-memory polymer or its compound substance to make, lay layer material and adopt carbon fiber and compound substance, silicon carbide fibre and compound substance thereof, copper wire, nickel wire or carbon-based nano paper material, lay the exit that layer is provided with two electrodes; When giving two electrifying electrodes, lay layer heat-dissipating, heating arrangement layer makes it the glass transition temperature reaching structural material, and external force is applied to honeycomb and reaches the object that honeycomb is out of shape, after stopping heating, honeycomb shape can be fixed, its size becomes large in the two directions, thus increases the size of backboard; When it is by Uniaxial Compression effect, its size planar reduces, thus reduces the size of backboard; Described negative poisson ' s ratio honeycomb has hyperbolicity characteristic.
The present invention also has following feature:
1, above-described negative poisson ' s ratio honeycomb adopts the chirality honeycomb with Negative poisson's ratio, comprise the rigidity block of multiple mutual equispaced and the ligament of connection thereof, the change of its size relies on and connects the bending of ligament, each rigid layer block is corresponding with the region of the pixel cell position in flexible display Presentation Function layer, gap between each rigidity block can ensure that mutual collision in adjacent block between electron device and extruding do not occur flexible display in bending process, thus ensure flexible display repeatedly bending after still can ensure that it normally shows.
2, above-described shape memory polymer material is shape memory polyurethane resin, polyurethane class shape-memory polymer, isocyanate class shape-memory polymer, phenylethylene shape-memory polymer, the thermoplasticity shape-memory polymer of epoxies or thermoset shape memory polymkeric substance.
3, high elastic rubber circle is arranged with outside above-described structural sheet.
4, above-described structural sheet adopts three ligament backhand honeycombs, four ligament chirality honeycombs, four ligament backhand honeycombs or anti-honeycomb three ligament backhand honeycomb.
5, a kind of flexible display adopts the flexible back plate of above-described a kind of flexible display.
The backboard of flexible display provided by the invention, has flexible, hyperbolicity, can there is change in size, can intelligent drives, lightweight and feature attractive in appearance.And due to the singularity of its structure; when selecting chirality honeycomb; can be considered that its rigid layer block being provided with spaced setting is to protect the electron device in flexible display; therefore, when carrying out bending to flexible display, the gap between each rigid layer block ensure that and mutual collision in adjacent block between electron device and extruding can not occur in Forging Process.So, then the bending life-span of flexible display can be extended.Have the honeycomb of Negative poisson's ratio compared with normal cellular structure, when having identical load-bearing capacity, negative poisson ' s ratio honeycomb has the advantage of lightweight, is easy to carry.This structure has shock resistance, antiknock quality simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of structure of the present invention;
Fig. 2 is anti-honeycomb figure;
Fig. 3 is the anti-honeycomb size variation diagram of Fig. 2;
Fig. 4 is chirality honeycomb,
Fig. 5 is size distortion figure a and b of the chirality honeycomb in Fig. 4;
Fig. 6 is three ligament backhand honeycombs;
Fig. 7 is four ligament chirality honeycombs;
Fig. 8 is four ligament backhand honeycombs;
Fig. 9 is anti-honeycomb three ligament backhand honeycomb.
Embodiment
Further illustrate according to Figure of description citing below:
Embodiment 1
As shown in Figure 1, a kind of flexible back plate of flexible display, comprise structural sheet 2 and lay layer 3, structural sheet adopts negative poisson ' s ratio honeycomb, lay layer to be laid in uniformly in the central plane of structural sheet, structural sheet adopts shape-memory polymer or its compound substance to make, and lays layer material and adopts carbon fiber and compound substance, silicon carbide fibre and compound substance thereof, copper wire, nickel wire or carbon-based nano paper material, lays the exit 4 that layer is provided with two electrodes; As shown in Figure 2, when giving two electrifying electrodes, lay layer heat-dissipating, heating arrangement layer makes it the glass transition temperature reaching structural material, and external force is applied to honeycomb and reaches the object that honeycomb is out of shape, after stopping heating, honeycomb shape can be fixed, and its size becomes large in the two directions, thus increases the size of backboard; As shown in Figure 3, when it is by Uniaxial Compression effect, its size planar reduces, thus reduces the size of backboard; Described negative poisson ' s ratio honeycomb has hyperbolicity characteristic.
Embodiment 2
As illustrated in figures 4-5, the present embodiment is as embodiment 1, and negative poisson ' s ratio honeycomb adopts the chirality honeycomb with Negative poisson's ratio, the rigidity block 5 comprising multiple mutual equispaced and the ligament 1 connected thereof, the change of its size relies on and connects the bending of ligament 1, each rigid layer block is corresponding with the region of the pixel cell position in flexible display Presentation Function layer, gap between each rigidity block can ensure that mutual collision in adjacent block between electron device and extruding do not occur flexible display in bending process, thus ensure flexible display repeatedly bending after still can ensure that it normally shows.And high elastic rubber circle once can be established with operator guards and user in structural sheet periphery.Further, the honeycomb of flexible display backboard of the present invention's design, its physical dimension has designability, and if then use chirality honeycomb, deviser can adjust the length of its border circular areas and ligament as required.
Embodiment 3
As shown in Figure 6, the difference of present embodiment and embodiment 2 is that structural sheet 2 is three ligament backhand honeycombs.
Embodiment 4
As shown in Figure 7, the difference of present embodiment and embodiment 2 is that structural sheet 2 is four ligament chirality honeycombs.
Embodiment 5
As shown in Figure 8, the difference of present embodiment and embodiment 2 is that structural sheet 2 is four ligament backhand honeycombs.
Embodiment 6
As shown in Figure 9, the difference of present embodiment and embodiment 2 is that structural sheet 2 is for being anti-honeycomb three ligament backhand honeycomb.
Embodiment 7
Further, the honeycomb of the flexible display backboard of the present invention's design has hyperbolicity characteristic, and namely when a direction bends, direction vertical with it back-flexing can not occur, but bends in the same way with it.This characteristic makes the bending of this backboard can meet body configuration completely thus can become ornament attractive in appearance according to the needs moulding of user, as bracelet, pendant etc., attractive in appearance and be easy to carry.
With the flexible display backboard that this method makes, its special honeycomb structure imparts excellent distortion and the mechanical characteristic of backboard, and simultaneously applying shape memory material solves flexible display prepared by traditional material in use complicacy, the problem such as labour cost is high, manufacture of materials cost is expensive and production efficiency is poor.This honeycomb has designability simultaneously, make in its structure, to carry spaced rigidity block, each rigid layer block can be corresponding with the region of the pixel cell position in flexible display Presentation Function layer to ensure that mutual collision in adjacent block between electron device and extruding do not occur flexible display in bending process, thus extend the serviceable life of flexible display.
Claims (2)
1. the flexible back plate of a flexible display, comprise structural sheet and lay layer, it is characterized in that: structural sheet adopts negative poisson ' s ratio honeycomb, lay layer to be laid in uniformly in the central plane of structural sheet, structural sheet adopts shape-memory polymer or shape memory polymer composite material to make, lay layer material and adopt carbon fiber and compound substance, silicon carbide fibre and compound substance thereof, copper wire, nickel wire or carbon-based nano paper material, lay the exit that layer is provided with two electrodes, when giving two electrifying electrodes, lay layer heat-dissipating, heating arrangement layer makes it the glass transition temperature reaching structural material, and external force is applied to honeycomb and reaches the object that honeycomb is out of shape, after stopping heating, honeycomb shape can be fixed, its size becomes large in the two directions, thus increases the size of backboard, when it is by Uniaxial Compression effect, its size planar reduces, thus reduces the size of backboard, described negative poisson ' s ratio honeycomb has hyperbolicity characteristic, described negative poisson ' s ratio honeycomb adopts the chirality honeycomb with Negative poisson's ratio, comprise the rigidity block of multiple mutual equispaced and the ligament of connection thereof, the change of its size relies on and connects the bending of ligament, each rigid layer block is corresponding with the region of the pixel cell position in flexible display Presentation Function layer, gap between each rigidity block can ensure that mutual collision in adjacent block between electron device and extruding do not occur flexible display in bending process, thus ensure flexible display repeatedly bending after still can ensure that it normally shows, described shape memory polymer material is shape memory polyurethane resin, polyurethane class shape-memory polymer, isocyanate class shape-memory polymer, phenylethylene shape-memory polymer, the thermoplasticity shape-memory polymer of epoxies or thermoset shape memory polymkeric substance, described structural sheet adopts three ligament backhand honeycombs, four ligament chirality honeycombs, four ligament backhand honeycombs or anti-honeycomb three ligament backhand honeycomb, high elastic rubber circle is arranged with outside described structural sheet.
2. a flexible display, is characterized in that: the flexible back plate adopting a kind of flexible display as claimed in claim 1.
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| CN201310121957.7A CN103177656B (en) | 2013-03-26 | 2013-03-26 | Flexible back plate for flexible display |
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| CN201310121957.7A CN103177656B (en) | 2013-03-26 | 2013-03-26 | Flexible back plate for flexible display |
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| CN103177656B true CN103177656B (en) | 2015-07-01 |
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| CN111746443A (en) * | 2020-06-29 | 2020-10-09 | 南京航空航天大学 | Novel three-dimensional chiral negative Poisson ratio multicellular energy absorption structure |
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