WO2020113784A1 - 可折叠背板结构及显示装置 - Google Patents
可折叠背板结构及显示装置 Download PDFInfo
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- WO2020113784A1 WO2020113784A1 PCT/CN2019/072036 CN2019072036W WO2020113784A1 WO 2020113784 A1 WO2020113784 A1 WO 2020113784A1 CN 2019072036 W CN2019072036 W CN 2019072036W WO 2020113784 A1 WO2020113784 A1 WO 2020113784A1
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- foldable
- folding area
- layer
- backplane
- display device
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
Definitions
- the present disclosure relates to the field of foldable display, and particularly to a foldable backplane structure and display device.
- Display panel manufacturing technology has also become mature.
- Existing display panels mainly include organic electroluminescent display panels (Organic Light Emitting Diode (OLED), liquid crystal display panel (Liquid Crystal Display (LCD), Plasma Display Panel (PDP), etc.
- OLED Organic Light Emitting Diode
- LCD liquid crystal display panel
- PDP Plasma Display Panel
- the public demand for portable devices is increasing, and the foldable display device has the characteristics of easy portability and large-size screen.
- the current OLED panel uses a back plate to support and protect the screen after the glass is stripped by a laser stripping process.
- the inner surface of the back plate is deformed by compression and at the same time, it will also squeeze the adjacent film layer, thereby generating ripples.
- the existing foldable display device has the problem of ripple phenomenon. Therefore, it is necessary to provide a foldable backplane structure and its stacked display device to improve this defect.
- the current OLED panel uses a back plate to support and protect the screen after the glass is stripped by a laser stripping process.
- the inner surface of the back plate is deformed by compression and at the same time, it will also squeeze the adjacent film layer, thereby generating ripples.
- the present disclosure provides a foldable backplane structure for solving the problem of the existing foldable display device having the ripple phenomenon.
- the present disclosure provides a foldable backplane structure.
- the foldable backplane structure includes:
- a back plate the back plate includes a folding area and non-folding areas on both sides of the folding area, and the folding area is provided with a microstructure on the side near the display layer;
- An elastic member disposed on a side of the folding area away from the display layer.
- the microstructure is one of a V-shaped sawtooth structure or a trapezoidal pillar structure.
- the length of the elastic member is the same as the length of the folding area.
- the material of the backplane is polyimide.
- the material of the elastic member is EVA.
- the present disclosure provides a foldable backplane structure.
- the foldable backplane structure includes:
- a back plate the back plate includes a folding area and non-folding areas on both sides of the folding area, and the folding area is provided with a microstructure on the side near the display layer;
- An elastic member disposed on a side of the folding area away from the display layer;
- the microstructure is a V-shaped sawtooth structure or a trapezoidal column structure.
- the length of the elastic member is the same as the length of the folding area.
- the material of the backplane is polyimide.
- the material of the elastic member is EVA.
- the present disclosure provides a foldable display device including a foldable backplane structure, the foldable backplane structure including:
- a back plate the back plate includes a folding area and non-folding areas on both sides of the folding area, and the folding area is provided with a microstructure on the side near the display layer;
- An elastic member disposed on a side of the folding area away from the display layer.
- the microstructure is one of a V-shaped sawtooth structure or a trapezoidal pillar structure.
- the length of the elastic member is the same as the length of the folding area.
- the material of the backplane is polyimide.
- the material of the elastic member is EVA.
- the foldable display device further includes a display layer, and the display layer is disposed on the backplane.
- the foldable display device includes a first adhesive layer, and the display layer is attached to the backplane through the first adhesive layer.
- the foldable display device further includes a polarizing layer and a touch layer, the polarizing layer is attached to the display layer through a second adhesive layer, and the touch layer is through a third An adhesive layer is attached on the polarizing layer.
- the foldable display device further includes a cover layer, and the cover layer is attached to the touch layer through a fourth adhesive layer.
- the embodiment of the present disclosure reduces the squeezing force of the inner surface of the backboard against other film layers by providing a microstructure on the side of the backboard folding area close to the display layer when the screen is folded inwardly ,
- the phenomenon of ripples is reduced, and at the same time, an elastic member is provided on the side of the folding area away from the display layer, the elastic member can restore the deformation to the flat state by pulling the display screen of the folding display device, and the foldable display is enhanced The folding recovery ability of the device.
- FIG. 1 is a schematic structural diagram of a foldable backplane structure provided by an embodiment of the present disclosure
- FIG. 2 is a schematic structural diagram of a folded state of a foldable backplane structure provided by an embodiment of the disclosure
- FIG. 3 is a schematic structural diagram of a folded state of a foldable display device provided by an embodiment of the present disclosure.
- This embodiment provides a foldable backplane structure, which will be described in detail below with reference to FIGS. 1 to 2.
- FIG. 1 is a schematic structural diagram of a foldable backplane structure provided by an embodiment of the present disclosure, wherein the foldable backplane structure includes a backplane 101, and the backplane 101 is further divided into a folding area 103 and a The non-folding area 102 on both sides of the folding area has no interface between the folding area 103 and the non-folding area 102 to form an integrated structure, so that when folded, the foldable display device has no obvious interface.
- the material of the back plate 101 can be selected and the material of the back plate 101 can be modified, so that the folding area has a large deformation, and the non-folding area has high rigidity and strength, so that the folding area and the non-folding area will not appear.
- the material of the backplane can be polyimide (PI).
- PI polyimide
- the polyimide itself has good resistance to bending, stretching and high impact resistance, which can meet the backplane in production. 101 demand for bending resistance.
- FIG. 2 is a schematic structural view of the foldable backplane structure in a bent state.
- the microstructures 104 shrink toward the middle, because there is a gap between the microstructures 104, which can effectively reduce the deformation protrusion of the folding area 103, thereby avoiding the folding area 103 from bending Under the state, the squeezing force generated by the larger deformation amount to other film layers on the inner surface leads to the occurrence of the ripple phenomenon.
- the microstructure 104 may be a V-shaped sawtooth structure shown in FIG. 1, and may also be a trapezoidal columnar structure.
- the back plate 101 further includes an elastic member 105, and the elastic member 105 is disposed on a side of the folding area 103 away from the display layer.
- a side of the folding area 103 away from the display layer is provided with a groove 106, the cross-sectional shape of the groove 106 is rectangular, and the elastic member 105 is disposed in the groove 106.
- the elastic member 105 has a good ability to recover from deformation, and can pull the foldable back plate structure and the foldable display device to restore a flat state.
- the material selected for the elastic member 105 is ethylene-vinyl acetate copolymer (EVA), which is solid at room temperature, and has good cushioning, shock resistance, heat insulation, and moisture resistance.
- EVA ethylene-vinyl acetate copolymer
- the content of VA has a great relationship.
- the content of VA increases, the resilience, flexibility, adhesion, stress crack resistance and impact performance of EVA will increase.
- the content of VA is 45%-55%, EVA It has good elasticity and is used as the material of the elastic member 105, which can provide good recovery deformation ability and can restore the foldable back plate structure to a flat state.
- other materials with the same properties can also be selected.
- the length of the elastic member 105 is the same as the length of the folding area 103 and the distribution length of the microstructure 104 in the folding area 103, and the specific length needs to be determined according to the length of the actual design panel bending area.
- This embodiment provides a foldable backplane structure, which will be described in detail below with reference to FIGS. 1 to 2.
- FIG. 1 is a schematic structural diagram of a foldable backplane structure provided by an embodiment of the present disclosure, wherein the foldable backplane structure includes a backplane 101, and the backplane 101 is further divided into a folding area 103 and a The non-folding area 102 on both sides of the folding area has no interface between the folding area 103 and the non-folding area 102 to form an integrated structure, so that when folded, the foldable display device has no obvious interface.
- the material of the back plate 101 can be selected and the material of the back plate 101 can be modified, so that the folding area has a large deformation, and the non-folding area has high rigidity and strength, so that the folding area and the non-folding area will not appear.
- the material of the backplane can be polyimide (PI).
- PI polyimide
- the polyimide itself has good resistance to bending, stretching and high impact resistance, which can meet the backplane in production. 101 demand for bending resistance.
- a microstructure 104 is provided on the side of the folding area 103 near the display layer, and the side of the microstructure 104 is in contact with the display layer.
- the shape of the microstructure 104 is a V-shaped sawtooth structure or a trapezoidal columnar structure.
- FIG. 2 is a schematic structural view of the foldable backplane structure in a bent state.
- the microstructures 104 shrink toward the middle, because there is a gap between the microstructures 104, which can effectively reduce the deformation protrusion of the folding area 103, thereby avoiding the folding area 103 from bending Under the state, the squeezing force generated by the larger deformation amount to other film layers on the inner surface leads to the occurrence of the ripple phenomenon.
- the back plate 101 further includes an elastic member 105, and the elastic member 105 is disposed on a side of the folding area 103 away from the display layer.
- a side of the folding area 103 away from the display layer is provided with a groove 106, the cross-sectional shape of the groove 106 is rectangular, and the elastic member 105 is disposed in the groove 106.
- the elastic member 105 has a good ability to recover from deformation, and can pull the foldable back plate structure and the foldable display device to restore a flat state.
- the material selected for the elastic member 105 is ethylene-vinyl acetate copolymer (EVA), which is solid at room temperature, and has good cushioning, shock resistance, heat insulation, and moisture resistance.
- EVA ethylene-vinyl acetate copolymer
- the content of VA has a great relationship.
- the content of VA increases, the resilience, flexibility, adhesion, stress crack resistance and impact performance of EVA will increase.
- the content of VA is 45%-55%, EVA It has good elasticity and is used as the material of the elastic member 105, which can provide a good ability to recover deformation, and can restore the foldable back plate structure to a flat state.
- other materials with the same properties can also be selected.
- the length of the elastic member 105 is the same as the length of the folding area 103 and the distribution length of the microstructure 104 in the folding area 103, and the specific length needs to be determined according to the length of the actual design panel bending area.
- This embodiment provides a foldable display device, which will be described in detail below with reference to FIG. 3.
- FIG. 3 is a schematic structural diagram of a foldable display device according to an embodiment of the present disclosure, wherein the foldable backplane structure includes a backplane 301, and the backplane 301 is further divided into a folding region 303 and a fold
- the non-folding area 302 on both sides of the area has no interface between the folding area 303 and the non-folding area 302 to form an integrated structure, so that when folded, the foldable display device has no obvious interface.
- the material of the back plate 301 can be selected and the material of the back plate 301 can be modified, so that the folding area has a larger deformation, and the non-folding area has higher rigidity and strength, so that the folding area and the non-folding area will not appear.
- the material of the backplane can be polyimide (PI).
- PI polyimide
- the polyimide itself has good resistance to bending, stretching and high impact resistance, which can meet the backplane in production. 301 anti-bending performance requirements.
- a microstructure 304 is provided on the side of the folding area 303 near the display layer, and the side of the microstructure 304 is in contact with the display layer.
- the microstructures 304 shrink toward the middle, because there is a gap between the microstructures 304, which can effectively reduce the deformation protrusion of the folding area 303, thereby avoiding the folding area 303 from bending Under the state, the squeezing force generated by the larger deformation amount to other film layers on the inner surface leads to the occurrence of the ripple phenomenon.
- the microstructure 304 may be a V-shaped sawtooth structure, and may also be a trapezoidal columnar structure.
- the back plate 301 further includes an elastic member 305, and the elastic member 305 is disposed on a side of the folding area 303 away from the display layer.
- a side of the folding area 303 away from the display layer is provided with a groove 306, the cross-sectional shape of the groove 306 is rectangular, and the elastic member 305 is disposed in the groove 306.
- the elastic member 305 has a good ability to recover from deformation, and can pull the foldable back plate structure and the foldable display device to restore a flat state.
- the material selected for the elastic member 305 is ethylene-vinyl acetate copolymer (EVA), which is solid at room temperature, and has good cushioning, shock resistance, heat insulation, and moisture resistance.
- EVA ethylene-vinyl acetate copolymer
- the content of VA has a great relationship.
- the content of VA increases, the resilience, flexibility, adhesion, stress crack resistance and impact performance of EVA will increase.
- the content of VA is 45%-55%, EVA It has good elasticity and is used as the material of the elastic member 305, which can provide good recovery deformation ability and can restore the foldable back panel structure to a flat state.
- other materials with the same properties can also be selected.
- the length of the elastic member 305 is the same as the length of the folding area 303 and the distribution length of the microstructure 304 in the folding area 303.
- the specific length needs to be determined according to the length of the actual design panel bending area.
- the foldable display device further includes a display layer 302, the display layer 308 is disposed on the back plate 301, and the display layer 308 and the back plate 301 are bonded to each other by a first adhesive layer 307.
- the foldable display device further includes a polarizing layer 310 and a touch layer 312, the polarizing layer 310 is attached to the display layer 308 through a second adhesive layer 309, and the touch layer 312 is passed through a third adhesive
- the layer 311 is attached on the polarizing layer 310.
- the foldable display device further includes a cover layer 314, and the cover layer 314 is attached to the touch layer 312 through a fourth adhesive layer 313.
- the first adhesive layer 307, the second adhesive layer 309, the third adhesive layer 311, and the fourth adhesive layer 313 are all optically transparent adhesives.
- the optical transparent adhesive has a certain bonding strength, and also has the characteristics of high light transmittance, good elasticity, low hardness, etc., not only can bond each film layer of the display device, but also can be used as a filler phase
- the adjacent membrane layer serves as a buffer protection.
- the embodiment of the present disclosure reduces the squeezing force of the inner surface of the back plate against other film layers and reduces the phenomenon of ripples by providing a microstructure on the side of the back plate folding area close to the display layer when the screen is folded inwardly
- an elastic member is provided on the side of the folding area away from the display layer. With the good ability of the elastic member to recover the deformation, the display screen of the folding display device can be pulled back to a flat state, and the recovery ability of the foldable display device is enhanced.
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Abstract
一种可折叠背板结构，可折叠背板结构包括：背板（101），背板（101）包括折叠区（103）和位于折叠区（103）两侧的非折叠区（102），折叠区（103）靠近显示层（308）一侧设有微结构（104）；弹性构件（105），弹性构件（105）设置在折叠区（103）远离显示层（308）一侧，以及一种可折叠显示装置，可折叠显示装置包括可折叠背板结构。
Description
本揭示涉及可折叠显示领域，尤其涉及一种可折叠背板结构及显示装置。
随着显示技术的不断发展，显示面板制造技术也趋于成熟，现有的显示面板主要包括有机电致发光显示面板(Organic Light
Emitting Diode，OLED)、液晶显示面板(Liquid
Crystal Display，LCD)、等离子显示面板(Plasma Display Panel，PDP)等。当今，对于在便携式设备(例如移动电话、平板电脑等)的公共需求不断增加，可折叠显示装置具有易携带、大尺寸屏幕等特点。
目前的 OLED面板经过激光剥离工艺将玻璃剥离后使用背板来支撑并保护屏幕。在折叠屏幕的过程中，背板的内表面受压产生变形的同时也会对相邻膜层产生挤压力，从而产生波纹现象。
综上所述，现有可折叠显示装置存在波纹现象的问题。故，有必要提供一种可折叠背板结构及其叠显示装置来改善这一缺陷。
目前的 OLED面板经过激光剥离工艺将玻璃剥离后使用背板来支撑并保护屏幕。在折叠屏幕的过程中，背板的内表面受压产生变形的同时也会对相邻膜层产生挤压力，从而产生波纹现象。
本揭示提供一种可折叠背板结构，用于解决现有可折叠显示装置存在波纹现象的问题。
本揭示提供一种可折叠背板结构，所述可折叠背板结构包括:
背板，所述背板包括折叠区和位于所述折叠区两侧的非折叠区，所述折叠区靠近显示层一侧设有微结构；
弹性构件，所述弹性构件设置在所述折叠区远离所述显示层一侧。
根据本揭示一实施例，所述微结构为V型锯齿结构或者梯形柱结构中的一种。
根据本揭示一实施例，所述弹性构件的长度与所述折叠区长度相同。
根据本揭示一实施例，所述背板的材料为聚酰亚胺。
根据本揭示一实施例，所述弹性构件的材质为EVA。
本揭示提供一种可折叠背板结构，所述可折叠背板结构包括:
背板，所述背板包括折叠区和位于所述折叠区两侧的非折叠区，所述折叠区靠近显示层一侧设有微结构；
弹性构件，所述弹性构件设置在所述折叠区远离所述显示层一侧；
其中，所述微结构为V型锯齿结构或者梯形柱结构。
根据本揭示一实施例，所述弹性构件的长度与所述折叠区长度相同。
根据本揭示一实施例，所述背板的材料为聚酰亚胺。
根据本揭示一实施例，所述弹性构件的材质为EVA。
本揭示提供一种可折叠显示装置，所述可折叠显示装置包括可折叠背板结构，所述可折叠背板结构包括：
背板，所述背板包括折叠区和位于所述折叠区两侧的非折叠区，所述折叠区靠近显示层一侧设有微结构；
弹性构件，所述弹性构件设置在所述折叠区远离所述显示层一侧。
根据本揭示一实施例，所述微结构为V型锯齿结构或者梯形柱结构中的一种。
根据本揭示一实施例，所述弹性构件的长度与所述折叠区长度相同。
根据本揭示一实施例，所述背板的材料为聚酰亚胺。
根据本揭示一实施例，所述弹性构件的材质为EVA。
根据本揭示一实施例，所述可折叠显示装置还包括显示层，所述显示层设置于所述背板上。
根据本揭示一实施例，所述可折叠显示装置包括第一粘胶剂层，所述显示层通过所述第一粘胶剂层附接在所述背板上。
根据本揭示一实施例，所述可折叠显示装置还包括偏光层以及触控层，所述偏光层通过第二粘胶剂层附接在所述显示层上，所述触控层通过第三粘胶剂层附接在所述偏光层上。
根据本揭示一实施例，所述可折叠显示装置还包括覆盖层，所述覆盖层通过第四粘胶剂层附接在所述触控层上。
本揭示的有益效果：本揭示实施例通过在背板折叠区靠近显示层一侧设有微结构，在屏幕向内折叠的状态下，减小了背板内表面对其他膜层的挤压力，减轻了波纹的现象，同时在所述折叠区远离显示层一侧设有弹性构件，利用弹性构件良好的恢复形变的能力，可以拉动折叠显示装置显示屏恢复到平整状态，增强了可折叠显示装置的折叠恢复能力。
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是揭示的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本揭示实施例提供的可折叠背板结构的结构示意图；
图2为本揭示实施例提供的可折叠背板结构弯折状态的结构示意图；
图3为本揭示实施例提供的可折叠显示装置弯折状态的结构示意图。
以下各实施例的说明是参考附加的图示，用以例示本申请可用以实施的特定实施例。本申请所提到的方向用语，例如[上]、[下]、[前]、[后]、[左]、[右]、[内]、[外]、[侧面]等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本申请，而非用以限制本申请。在图中，结构相似的单元是用以相同标号表示。
下面结合附图和具体实施例对本揭示做详细说明：
实施例一：
本实施例提供了一种可折叠背板结构，下面结合图1至图2进行详细说明。
如图1所示，图1是本揭示实施例提供的可折叠背板结构的结构示意图，其中可折叠背板结构包括背板101，所述背板101又分为折叠区103和位于所述折叠区两侧的非折叠区102，所述折叠区103和非折叠区102之间没有界面而成一体结构，从而在弯折时，使得可折叠显示装置没有明显的界面。
可以通过对背板101材料的选择以及对背板101材料进行改性，使得折叠区具有较大的形变，非折叠区具有较高的刚性和强度，从而不会出现折叠区和非折叠区由于界面的存在而裂开的现象。在本实施例中，所述背板的材质可选用聚酰亚胺（PI），聚酰亚胺本身具有较好的抗弯曲、拉伸和高抗冲击性能，能够满足生产制造中对背板101抗弯折性能的需求。
在本实施例中，折叠区103靠近显示层一侧设有微结构104，微结构104一侧与所述显示层相接触。如图2所示，图2为可折叠背板结构弯折状态时的结构示意图。在可折叠显示装置向内折叠时，微结构104向中间收缩，因为微结构104相互之间存在有间隙，可以有效减小的折叠区103的形变凸出量，从而避免折叠区103在弯折状态下，产生较大的形变量对内表面其他膜层产生的挤压力，导致波纹现象的发生。
优选的，微结构104可以为图1所示的V型锯齿结构，同样也可以是梯形柱状结构。
优选的，背板101还包括弹性构件105，所述弹性构件105设置在所述折叠区103远离显示层一侧。如图1所示，折叠区103远离显示层一侧设有凹槽106，所述凹槽106截面形状为矩形，所述弹性构件105设置于凹槽106内。所述弹性构件105具备良好的恢复形变能力，可以拉动可折叠背板结构以及可折叠显示装置恢复平整状态。
优选的，所述弹性构件105选用的材料为乙烯-醋酸乙烯共聚物(EVA)，EVA常温下为固体，具有良好的缓冲、抗震、隔热、防潮性能，同时EVA的性能与乙酸乙烯酯（VA）的含量有很大的关系，当VA的含量增加时，EVA的回弹性、柔韧性、粘合性、耐应力开裂性以及冲击性能都会提高，VA含量在45%-55%时，EVA的弹性良好，用作弹性构件105的材料，能够提供良好的恢复形变能力，可以将可折叠背板结构恢复平整状态。在一些实施例中也可以选用其他具有相同性质的材料。
优选的，所述弹性构件105的长度与所述折叠区103长度以及所述微结构104在所述折叠区103的分布长度均相同，具体长度需要根据实际设计面板弯折区的长度而定。
实施例二：
本实施例提供了一种可折叠背板结构，下面结合图1至图2进行详细说明。
如图1所示，图1是本揭示实施例提供的可折叠背板结构的结构示意图，其中可折叠背板结构包括背板101，所述背板101又分为折叠区103和位于所述折叠区两侧的非折叠区102，所述折叠区103和非折叠区102之间没有界面而成一体结构，从而在弯折时，使得可折叠显示装置没有明显的界面。
可以通过对背板101材料的选择以及对背板101材料进行改性，使得折叠区具有较大的形变，非折叠区具有较高的刚性和强度，从而不会出现折叠区和非折叠区由于界面的存在而裂开的现象。在本实施例中，所述背板的材质可选用聚酰亚胺（PI），聚酰亚胺本身具有较好的抗弯曲、拉伸和高抗冲击性能，能够满足生产制造中对背板101抗弯折性能的需求。
在本实施例中，折叠区103靠近显示层一侧设有微结构104，微结构104一侧与所述显示层相接触，所述微结构104形状为V型锯齿结构或者是梯形柱状结构。如图2所示，图2为可折叠背板结构弯折状态时的结构示意图。在可折叠显示装置向内折叠时，微结构104向中间收缩，因为微结构104相互之间存在有间隙，可以有效减小的折叠区103的形变凸出量，从而避免折叠区103在弯折状态下，产生较大的形变量对内表面其他膜层产生的挤压力，导致波纹现象的发生。
优选的，背板101还包括弹性构件105，所述弹性构件105设置在所述折叠区103远离显示层一侧。如图1所示，折叠区103远离显示层一侧设有凹槽106，所述凹槽106截面形状为矩形，所述弹性构件105设置于凹槽106内。所述弹性构件105具备良好的恢复形变能力，可以拉动可折叠背板结构以及可折叠显示装置恢复平整状态。
优选的，所述弹性构件105选用的材料为乙烯-醋酸乙烯共聚物(EVA)，EVA常温下为固体，具有良好的缓冲、抗震、隔热、防潮性能，同时EVA的性能与乙酸乙烯酯（VA）的含量有很大的关系，当VA的含量增加时，EVA的回弹性、柔韧性、粘合性、耐应力开裂性以及冲击性能都会提高，VA含量在45%-55%时，EVA的弹性良好，用作弹性构件105的材料，能够提供良好的恢复形变能力，可以将可折叠背板结构恢复平整状态。在一些实施例中也可以选用其他具有相同性质的材料。
优选的，所述弹性构件105的长度与所述折叠区103长度以及所述微结构104在所述折叠区103的分布长度均相同，具体长度需要根据实际设计面板弯折区的长度而定。
实施例三：
本实施例提供了一种可折叠显示装置，下面结合图3进行详细说明。
如图3所示，图3是本揭示实施例提供的可折叠显示装置的结构示意图，其中可折叠背板结构包括背板301，所述背板301又分为折叠区303和位于所述折叠区两侧的非折叠区302，所述折叠区303和非折叠区302之间没有界面而成一体结构，从而在弯折时，使得可折叠显示装置没有明显的界面。
可以通过对背板301材料的选择以及对背板301材料进行改性，使得折叠区具有较大的形变，非折叠区具有较高的刚性和强度，从而不会出现折叠区和非折叠区由于界面的存在而裂开的现象。在本实施例中，所述背板的材质可选用聚酰亚胺（PI），聚酰亚胺本身具有较好的抗弯曲、拉伸和高抗冲击性能，能够满足生产制造中对背板301抗弯折性能的需求。
在本实施例中，折叠区303靠近显示层一侧设有微结构304，微结构304一侧与所述显示层相接触。在可折叠显示装置向内折叠时，微结构304向中间收缩，因为微结构304相互之间存在有间隙，可以有效减小的折叠区303的形变凸出量，从而避免折叠区303在弯折状态下，产生较大的形变量对内表面其他膜层产生的挤压力，导致波纹现象的发生。
优选的，微结构304可以为的V型锯齿结构，同样也可以是梯形柱状结构。
优选的，背板301还包括弹性构件305，所述弹性构件305设置在所述折叠区303远离显示层一侧。如图3所示，折叠区303远离显示层一侧设有凹槽306，所述凹槽306截面形状为矩形，所述弹性构件305设置于凹槽306内。所述弹性构件305具备良好的恢复形变能力，可以拉动可折叠背板结构以及可折叠显示装置恢复平整状态。
优选的，所述弹性构件305选用的材料为乙烯-醋酸乙烯共聚物(EVA)，EVA常温下为固体，具有良好的缓冲、抗震、隔热、防潮性能，同时EVA的性能与乙酸乙烯酯（VA）的含量有很大的关系，当VA的含量增加时，EVA的回弹性、柔韧性、粘合性、耐应力开裂性以及冲击性能都会提高，VA含量在45%-55%时，EVA的弹性良好，用作弹性构件305的材料，能够提供良好的恢复形变能力，可以将可折叠背板结构恢复平整状态。在一些实施例中也可以选用其他具有相同性质的材料。
优选的，所述弹性构件305的长度与所述折叠区303长度以及所述微结构304在所述折叠区303的分布长度均相同，具体长度需要根据实际设计面板弯折区的长度而定。
优选的，可折叠显示装置还包括显示层302，所述显示层308设置于背板301上，显示层308与背板301之间通过第一粘胶剂层307相互粘接。可折叠显示装置还包括偏光层310以及触控层312，所述偏光层310通过第二粘胶剂层309附接在所述显示层308上，所述触控层312通过第三粘胶剂层311附接在所述偏光层310上。
优选的，所述可折叠显示装置还包括覆盖层314，所述覆盖层314通过第四粘胶剂层313附接在所述触控层312上。
优选的，所述第一粘胶剂层307、第二粘胶剂层309、第三粘胶剂层311以及第四粘胶剂层313均采用光学透明粘胶剂。所述光学透明粘胶剂具有一定的胶接强度之外，还具备透光率高、弹性好、低硬度等特点，不仅可以粘结显示装置的各个膜层，同样也可以作为填充物对相邻膜层起到缓冲保护的作用。
本揭示实施例通过在背板折叠区靠近显示层一侧设有微结构，在屏幕向内折叠的状态下，减小了背板内表面对其他膜层的挤压力，减轻了波纹的现象，同时在所述折叠区远离显示层一侧设有弹性构件，利用弹性构件良好的恢复形变的能力，可以拉动折叠显示装置显示屏恢复到平整状态，增强了可折叠显示装置的恢复能力。
综上所述，虽然本揭示以优选实施例揭露如上，但上述优选实施例并非用以限制本揭示，本领域的普通技术人员，在不脱离本揭示的精神和范围内，均可作各种更动与润饰，因此本揭示的保护范围以权利要求界定的范围为基准。
Claims (18)
- 一种可折叠背板结构，包括:背板，所述背板包括折叠区和位于所述折叠区两侧的非折叠区，所述折叠区靠近显示层一侧设有微结构；弹性构件，所述弹性构件设置在所述折叠区远离所述显示层一侧。
- 如权利要求1所述的可折叠背板结构，其中，所述微结构为V型锯齿结构或者梯形柱结构。
- 如权利要求1所述的可折叠背板结构，其中，所述弹性构件的长度与所述折叠区长度相同。
- 如权利要求1所述的可折叠背板结构，其中，所述背板的材料为聚酰亚胺。
- 如权利要求1所述的可折叠背板结构，其中，所述弹性构件的材质为EVA。
- 一种可折叠背板结构，包括:背板，所述背板包括折叠区和位于所述折叠区两侧的非折叠区，所述折叠区靠近显示层一侧设有微结构；弹性构件，所述弹性构件设置在所述折叠区远离所述显示层一侧；其中，所述微结构为V型锯齿结构或者梯形柱结构。
- 如权利要求6所述的可折叠背板结构，其中，所述弹性构件的长度与所述折叠区长度相同。
- 如权利要求6所述的可折叠背板结构，其中，所述背板的材料为聚酰亚胺。
- 如权利要求6所述的可折叠背板结构，其中，所述弹性构件的材质为EVA。
- 一种可折叠显示装置，包括可折叠背板结构，所述可折叠背板结构包括：背板，所述背板包括折叠区和位于所述折叠区两侧的非折叠区，所述折叠区靠近显示层一侧设有微结构；弹性构件，所述弹性构件设置在所述折叠区远离所述显示层一侧。
- 如权利要求10所述的可折叠显示装置，其中，所述微结构为V型锯齿结构或者梯形柱结构。
- 如权利要求10所述的可折叠显示装置，其中，所述弹性构件的长度与所述折叠区长度相同。
- 如权利要求10所述的可折叠显示装置，其中，所述背板的材料为聚酰亚胺。
- 如权利要求10所述的可折叠显示装置，其中，如权利要求1所述的可折叠背板结构，其特征在于，所述弹性构件的材质为EVA。
- 如权利要求10所述的可折叠显示装置，其中，所述可折叠显示装置还包括显示层，所述显示层设置于所述背板上。
- 如权利要求15所述的可折叠显示装置，其中，所述可折叠显示装置包括第一粘胶剂层，所述显示层通过所述第一粘胶剂层附接在所述背板上。
- 如权利要求16所述的可折叠显示装置，其中，所述可折叠显示装置还包括偏光层以及触控层，所述偏光层通过第二粘胶剂层附接在所述显示层上，所述触控层通过第三粘胶剂层附接在所述偏光层上。
- 如权利要求17所述的可折叠显示装置，其中，所述可折叠显示装置还包括覆盖层，所述覆盖层通过第四粘胶剂层附接在所述触控层上。
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| EP3757668A1 (en) * | 2019-06-25 | 2020-12-30 | Samsung Display Co., Ltd. | Display device |
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