CN103177656A

Movatterモバイル変換

Info

Publication number: CN103177656A
Application number: CN2013101219577A
Authority: CN
Inventors: 姚永涛; 杨成; 黄建; 刘彦菊; 冷劲松
Original assignee: Harbin Institute of Technology Shenzhen
Current assignee: Harbin Institute of Technology Shenzhen
Priority date: 2013-03-26
Filing date: 2013-03-26
Publication date: 2013-06-26
Anticipated expiration: 2033-03-26
Also published as: CN103177656B

Abstract

本发明涉及一种柔性显示器的柔性背板，包括结构层和铺设层，结构层采用负泊松比蜂窝结构，铺设层均匀的平铺于结构层的中央平面内，结构层采用形状记忆聚合物或其复合材料制成，铺设层材料采用碳纤维，铺设层设置有两个电极的引出端；当给两个电极通电，铺设层生热，加热结构层使之达到结构层材料的玻璃化转变温度，并对蜂窝结构施加外力而达到使蜂窝变形的目的，停止加热后蜂窝形状能够固定，其尺寸在两个方向上变大，从而增大了背板的尺寸；当其受单向压缩作用时，其尺寸在平面内缩小，从而减小了背板的尺寸；所述的负泊松比蜂窝结构具有双曲率特性。本发明具有可弯曲、双曲率、抗冲击、防震特性、可智能驱动、轻质和美观的特点。

The invention relates to a flexible backplane of a flexible display, comprising a structural layer and a laying layer, the structural layer adopts a negative Poisson's ratio honeycomb structure, the laying layer is evenly laid on the central plane of the structural layer, and the structural layer adopts a shape memory polymer It is made of carbon fiber or its composite material, and the laying layer is made of carbon fiber, and the laying layer is provided with two electrode leads; when the two electrodes are energized, the laying layer generates heat, and the structural layer is heated to reach the glass transition temperature of the structural layer material , and apply an external force to the honeycomb structure to achieve the purpose of deforming the honeycomb. After the heating is stopped, the shape of the honeycomb can be fixed, and its size becomes larger in two directions, thereby increasing the size of the back plate; when it is subjected to unidirectional compression , its size shrinks in the plane, thereby reducing the size of the back plate; the negative Poisson's ratio honeycomb structure has double curvature characteristics. The invention has the characteristics of bendability, double curvature, impact resistance, shock resistance, intelligent driving, light weight and beautiful appearance.

Description

A kind of flexible back plate of flexible display

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, comprisestructural 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.

Embodiment 2

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 andembodiment 2 is thatstructural sheet 2 is three ligament backhand honeycombs.

Embodiment 4

As shown in Figure 7, the difference of present embodiment andembodiment 2 is thatstructural sheet 2 is four ligament chirality honeycombs.

Embodiment 5

As shown in Figure 8, the difference of present embodiment andembodiment 2 is thatstructural sheet 2 is four ligament backhand honeycombs.

Embodiment 6

As shown in Figure 9, the difference of present embodiment andembodiment 2 is thatstructural 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

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.