CN103177656A - Flexible back plate for flexible display - Google Patents
Flexible back plate for flexible display Download PDFInfo
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- CN103177656A CN103177656A CN2013101219577A CN201310121957A CN103177656A CN 103177656 A CN103177656 A CN 103177656A CN 2013101219577 A CN2013101219577 A CN 2013101219577A CN 201310121957 A CN201310121957 A CN 201310121957A CN 103177656 A CN103177656 A CN 103177656A
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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, because having, flexible display is convenient for carrying, lightweight, the advantage such as should not 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 technique challenge now is to make the brilliant substrate of fexible film electricity.
In the prior art, for flexible display, in flexible display, the material of flexible base, board is general 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 will cause permanent strain yet be bent to the scope that exceeds elastic deformation, and crushed element becomes the white opacity shape, and then affects its display quality.In addition, when flexible base, board is carried out bending, the electron device that is attached on flexible base, board is squeezed or stretches, after repeatedly bending is out of shape, flexible base, board can be due to stress fatigue, make the electron device damaged that is positioned on flexible base, board and cause circuit to damage, thereby cause dysfunction.
Negative poisson's ratio material is a kind of emerging investigation of materials direction.Its characteristic is: negative poisson's ratio material can expand perpendicular to the tension direction when being subject to stretching, rather than common contraction occurs; When being compressed, material is shrinking perpendicular to stress direction, rather than 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 property of negative poisson's ratio material makes it become gradually the new material that a class merits attention, and has wide application space.
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 simultaneously.Shape-memory polymer has the essential characteristic of polymkeric substance when transition temperature is following; When transition temperature is above, very large distortion can be arranged, and this distortion is fixable, such distortion simultaneously can recover again fully; The distortion of shape memory polymer material can be carried out intelligent drives according to design; Simultaneously its polymeric material has the excellent mechanical properties such as high specific strength that the resin-based polymeric material has, high specific stiffness.
Summary of the invention
based on above weak point, the present invention discloses a kind of flexible back plate of flexible display, it is to have utilized the Negative poisson's ratio of special honeycomb and the SME of novel intelligent material shape memory polymer and compound substance thereof, reach the glass transition temperature of material or melting transition temperature when above changing the extraneous thermal effect factor, the variation of size or the change of shape can occur, under the condition that reduces 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 the negative poisson ' s ratio honeycomb, laying layer is tiled in the central plane of structural sheet uniformly, 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 and give birth to heat, the heating arrangement layer makes it to reach the glass transition temperature of structural material, and honeycomb is applied external force and reaches the purpose that makes the honeycomb distortion, after stopped heating, honeycomb shape can be fixed, its size becomes on both direction greatly, thereby has increased the size of backboard; Do the used time when it is subjected to Uniaxial Compression, its size is planar dwindled, thereby has reduced the size of backboard; Described negative poisson ' s ratio honeycomb has the 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 a plurality of mutual equispaceds and the ligament of connection thereof, the change of its size relies on the bending that connects ligament, pixel cell position in each rigid layer block and flexible display Presentation Function layer regional corresponding, gap between each rigidity block can guarantee that mutual collision and the extruding between electron device in adjacent block do not occur flexible display in the bending process, thereby what guarantee flexible display repeatedly still can guarantee its normal demonstration after bending.
2, above-described shape memory polymer material is thermoplasticity shape-memory polymer or the thermoset shape memory polymkeric substance of shape memory polyurethane resin, polyurethane class shape-memory polymer, isocyanate class shape-memory polymer, phenylethylene shape-memory polymer, epoxies.
3, above-described structural sheet is arranged with the high elastic rubber circle outward.
4, above-described structural sheet adopts three ligament backhand honeycombs, four ligament chirality honeycombs, four ligament backhand honeycombs or anti-honeycomb three ligament backhand honeycombs.
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, but flexible, hyperbolicity had, can have change in size intelligent drives, lightweight and characteristics attractive in appearance.And due to the singularity of its structure; when selecting the chirality honeycomb; can be considered it is provided with rigid layer block that the space arranges and protects electron device in flexible display; therefore when flexible display was carried out bending, the gap between each rigid layer block had guaranteed can not occur mutual collision and the extruding between electron device in adjacent block in Forging Process.So, can extend the bending life-span of flexible display.Honeycomb with Negative poisson's ratio is compared with the normal cellular structure, in the situation that have identical load-bearing capacity, the negative poisson ' s ratio honeycomb has advantages of lightweight, is easy to carry.This structure has shock resistance, antiknock quality simultaneously.
Description of drawings
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 the chirality honeycomb,
Fig. 5 is size distortion figure a and the 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 honeycombs.
Embodiment
The below further illustrates for example according to Figure of description:
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 the negative poisson ' s ratio honeycomb, laying layer is tiled in the central plane of structural sheet uniformly, 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 and give birth to heat, the heating arrangement layer makes it to reach the glass transition temperature of structural material, and honeycomb is applied external force and reaches the purpose that makes the honeycomb distortion, after stopped heating, honeycomb shape can be fixed, and its size becomes on both direction greatly, thereby has increased the size of backboard; As shown in Figure 3, do the used time when it is subjected to Uniaxial Compression, its size is planar dwindled, thereby has reduced the size of backboard; Described negative poisson ' s ratio honeycomb has the hyperbolicity characteristic.
as shown in Fig. 4-5, the present embodiment such as embodiment 1, and the negative poisson ' s ratio honeycomb adopts the chirality honeycomb with Negative poisson's ratio, comprise the rigidity block 5 of a plurality of mutual equispaceds and the ligament 1 that connects thereof, the change of its size relies on the bending that connects ligament 1, pixel cell position in each rigid layer block and flexible display Presentation Function layer regional corresponding, gap between each rigidity block can guarantee that mutual collision and the extruding between electron device in adjacent block do not occur flexible display in the bending process, thereby what guarantee flexible display repeatedly still can guarantee its normal demonstration after bending.And can once establish in the structural sheet periphery high elastic rubber circle with protection structure and user.Further, the honeycomb of the flexible display backboard of the present invention design, its physical dimension has designability, and if then use the chirality honeycomb, the 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 honeycombs.
Embodiment 7
Further, the honeycomb of the flexible display backboard of the present invention's design has the hyperbolicity characteristic, and namely when a direction was crooked, vertical direction back-flexing can not occur with it, but crooked in the same way with it.Thereby making the bending of this backboard can meet the body configuration fully, this characteristic can become ornament attractive in appearance according to user's needs moulding, as bracelet, pendant etc., attractive in appearance and be easy to carry.
Flexible display backboard with this method making, its special honeycomb structure has been given good distortion and the mechanical characteristic of backboard, simultaneously the applying shape memory material flexible display in use complicacy, the problem such as labour cost is high, the manufacture of materials cost is expensive and production efficiency is poor that solve the traditional material preparation.This honeycomb has designability simultaneously, make the rigidity block that carries the space in its structure, each rigid layer block can with flexible display Presentation Function layer in pixel cell position regional corresponding guaranteeing that mutual collision and the extruding between electron device in adjacent block do not occur flexible display in the bending process, thereby extend the serviceable life of flexible display.
Claims (6)
1. the flexible back plate of a flexible display, comprise structural sheet and lay layer, it is characterized in that: structural sheet adopts the negative poisson ' s ratio honeycomb, laying layer is tiled in the central plane of structural sheet uniformly, 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 and give birth to heat, the heating arrangement layer makes it to reach the glass transition temperature of structural material, and honeycomb is applied external force and reaches the purpose that makes the honeycomb distortion, after stopped heating, honeycomb shape can be fixed, its size becomes on both direction greatly, thereby has increased the size of backboard; Do the used time when it is subjected to Uniaxial Compression, its size is planar dwindled, thereby has reduced the size of backboard; Described negative poisson ' s ratio honeycomb has the hyperbolicity characteristic.
2. the flexible back plate of a kind of flexible display according to claim 1, it is characterized in that: described negative poisson ' s ratio honeycomb adopts the chirality honeycomb with Negative poisson's ratio, comprise the rigidity block of a plurality of mutual equispaceds and the ligament of connection thereof, the change of its size relies on the bending that connects ligament, pixel cell position in each rigid layer block and flexible display Presentation Function layer regional corresponding, gap between each rigidity block can guarantee that mutual collision and the extruding between electron device in adjacent block do not occur flexible display in the bending process, thereby what guarantee flexible display repeatedly still can guarantee its normal demonstration after bending.
3. the flexible back plate of a kind of flexible display according to claim 1, it is characterized in that: described shape memory polymer material is thermoplasticity shape-memory polymer or the thermoset shape memory polymkeric substance of shape memory polyurethane resin, polyurethane class shape-memory polymer, isocyanate class shape-memory polymer, phenylethylene shape-memory polymer, epoxies.
4. the flexible back plate of a kind of flexible display according to claim 1 and 2, is characterized in that: described structural sheet employing three ligament backhand honeycombs, four ligament chirality honeycombs, four ligament backhand honeycombs or anti-honeycomb three ligament backhand honeycombs.
5. the flexible back plate of a kind of flexible display according to claim 1 and 2, it is characterized in that: described structural sheet is arranged with the high elastic rubber circle outward.
6. a flexible display adopts the flexible back plate as the described a kind of flexible display of claim 1-3 any one.
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| CN201310121957.7A CN103177656B (en) | 2013-03-26 | 2013-03-26 | Flexible back plate for flexible display |
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| CN105096750A (en) * | 2015-08-05 | 2015-11-25 | 联想(北京)有限公司 | Display panel and flexible adjusting method thereof and electronic device |
| CN105333296A (en) * | 2015-12-07 | 2016-02-17 | 哈尔滨工业大学 | Negative poisson ratio honeycomb structure based on bistable composite material expandable cylindrical shell |
| CN105608999A (en) * | 2016-02-25 | 2016-05-25 | 联想(北京)有限公司 | Electronic device |
| CN105666077A (en) * | 2016-04-12 | 2016-06-15 | 北京科技大学 | Foldable chiral honeycomb structure machining method and machining device |
| CN106825542A (en) * | 2017-01-19 | 2017-06-13 | 吉林大学 | Negative poisson's ratio high-magnetostriction material and its increasing material manufacturing method |
| JP2017116782A (en) * | 2015-12-25 | 2017-06-29 | エルジー ディスプレイ カンパニー リミテッド | Flexible display and method for using the display |
| CN106910431A (en) * | 2017-05-04 | 2017-06-30 | 京东方科技集团股份有限公司 | The method of the shape of flexible display screen and change flexible display screen |
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| CN112396952A (en) * | 2019-08-13 | 2021-02-23 | 陕西坤同半导体科技有限公司 | Flexible display panel, touch panel and flexible display device |
| CN111696442A (en) * | 2020-06-17 | 2020-09-22 | 合肥维信诺科技有限公司 | Flexible screen folding cover plate, preparation method thereof and flexible display module |
| CN111696442B (en) * | 2020-06-17 | 2022-04-01 | 合肥维信诺科技有限公司 | Flexible screen folding cover plate, preparation method thereof and flexible display module |
| 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 |
| CN114120815A (en) * | 2020-08-27 | 2022-03-01 | 深圳柔宇显示技术有限公司 | Stretchable display screen, manufacturing method thereof and electronic equipment |
| CN112045990A (en) * | 2020-09-10 | 2020-12-08 | 西安交通大学 | Chiral auxetic metamaterial structure with compression-shear coupling characteristic and preparation method thereof |
| CN112029174B (en) * | 2020-09-10 | 2021-12-28 | 西安交通大学 | Continuous fiber reinforced composite material auxetic structure and preparation method thereof |
| CN112029174A (en) * | 2020-09-10 | 2020-12-04 | 西安交通大学 | Continuous fiber reinforced composite material auxetic structure and preparation method thereof |
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| CN113669401A (en) * | 2021-07-26 | 2021-11-19 | 广州大学 | Negative Poisson ratio single cell structure and honeycomb structure with rotation characteristic |
| CN114783300A (en) * | 2022-05-30 | 2022-07-22 | 武汉华星光电半导体显示技术有限公司 | Flexible display module |
| CN116416878A (en) * | 2023-03-22 | 2023-07-11 | 大连理工大学 | Flexible LED lattice screen without image distortion under large stretching quantity |
| CN116416878B (en) * | 2023-03-22 | 2023-09-26 | 大连理工大学 | Flexible LED lattice screen without image distortion under large stretching quantity |
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