WO2019218710A1 - 柔性元件、柔性显示设备及其制作方法 - Google Patents
柔性元件、柔性显示设备及其制作方法 Download PDFInfo
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- WO2019218710A1 WO2019218710A1 PCT/CN2019/070945 CN2019070945W WO2019218710A1 WO 2019218710 A1 WO2019218710 A1 WO 2019218710A1 CN 2019070945 W CN2019070945 W CN 2019070945W WO 2019218710 A1 WO2019218710 A1 WO 2019218710A1
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- flexible
- layer
- base layer
- flexible member
- flexible display
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Definitions
- Embodiments of the present disclosure relate to the field of display technologies, and in particular, to a flexible display device and a method of fabricating the same, and a flexible component used in the flexible display device.
- the OLED display panel is a display panel made of an Organic Light-Emitting Diode (OLED). OLED display panels are more and more popular due to their thin and light (no backlight), high brightness, high definition, deformability and bendability (ie flexibility), energy saving, etc. More attention and recognition. More and more electronic devices are currently using OLED flexible display panels.
- the flexible display panel is a deformable, bendable display panel made of a flexible material.
- the flexible display panel breaks through the original concept of the original two-dimensional display and expands the application field of the display to more dimensional and portable electronic devices.
- the foldable display has received wide attention in the industry.
- flexible display panels also have their own shortcomings and deficiencies.
- the flexible display panel is relatively thin and light, so it is inferior in bending resistance and impact resistance; the local large deformation caused by frequent bending may cause denaturation of the polymer material in the display panel, and even the bending region may be folded.
- the phenomenon of "marks" and "white lines” causes the display panel to fail. Therefore, it is necessary to improve the bending resistance and impact resistance of the flexible display panel.
- improving the bending resistance and impact resistance of a flexible display panel generally starts from the following two methods: one method is to start from the internal structure of the flexible display panel, that is, to improve the internal structure and material of the flexible display panel. It is difficult and not implementable; another method is to start from the outside of the flexible display panel, for example, a protective cover is additionally applied around the outer contour of the flexible display panel, and the protective cover is used for the flexible display panel. It is well protected, but because the protective cover is tightly enclosed around the flexible display panel, the flexible display panel is blocked, and the protective cover needs to be removed before use for display.
- some embodiments of the present disclosure provide a flexible member suitable for being disposed on a flexible display panel, the flexible member including: a first base layer and a second base layer disposed opposite to each other; and sandwiching the first base layer and a buffer layer between the second substrate, wherein the flexible member is bendable about a bending axis, and the projection of the buffer layer on a plane perpendicular to the bending axis is wavy.
- the flexible member further includes: a first fixed layer disposed between the first base layer and the buffer layer; and disposed between the second base layer and the buffer layer The second fixed layer.
- the first pinned layer and the second pinned layer are adhesive layers.
- the material of the buffer layer is a metal.
- the metal is at least one of the following materials: shape memory alloy, spring steel, high hardness stainless steel, hardened aluminum, and aluminum alloy.
- the wavy shape is a zigzag or sinusoidal waveform.
- the first base layer and the second base layer are made of a flexible material having a buckling return property.
- the flexible member may include one undulating buffer layer, and may also include two or more undulating buffer layers.
- each adjacent wavy buffer layer is separated by a spacer layer, and the spacer layer and each buffer layer may pass through a bonding layer. Bonding.
- the respective wavy buffer layers may be different in shape and size.
- a plurality of holes are respectively formed in the first base layer and the second base layer.
- the plurality of holes have a distribution density in a bending region having a larger radius of curvature of the first base layer than a bending portion having a smaller radius of curvature in the first base layer. a distribution density in the region; and the distribution density of the plurality of holes in the bending region having a larger radius of curvature of the second base layer is greater than a bending region in which the radius of curvature of the second base layer is small Distribution density.
- each of the plurality of holes extends in the same direction as the bending axis.
- the buffer layer has a thickness of 40 to 1000 micrometers in a direction perpendicular to the first base layer and the second base layer.
- the buffer layer has a thickness of 30-300 microns.
- Some embodiments of the present disclosure also provide a flexible display device comprising: at least one of the above-described flexible members; an adhesive layer; and a flexible display panel, wherein the first base layer of the at least one flexible member is The non-display substrates of the flexible display panel are bonded together by the adhesive layer.
- the adhesive layer is a pressure sensitive adhensive (PSA).
- PSA pressure sensitive adhensive
- the at least one flexible element is a plurality of flexible elements that are stacked one on another and bonded together.
- Some embodiments of the present disclosure also provide a method of fabricating a flexible display device, comprising the steps of: providing at least one of the above flexible members; providing a flexible display panel; and splicing the at least one flexible member by an adhesive layer A base layer is bonded to the non-display substrate of the flexible display panel to form a flexible display device.
- FIG. 1 is a schematic cross-sectional view of a flexible display device in an unbent state, in accordance with some embodiments of the present disclosure.
- FIG. 2 schematically illustrates a perspective structural view of a flexible display device in a bent state in which a flexible member is adhered to the entire back surface of the flexible display panel (integral bonding), in accordance with some embodiments of the present disclosure.
- FIG. 3 schematically illustrates a cross-sectional view of a flexible display device in a bent state in which a flexible member is bonded over the entire back surface of a flexible display panel, in accordance with some embodiments of the present disclosure.
- FIG. 4 schematically illustrates a perspective structural view of a flexible display device in a bent state in which a flexible member is bonded (partially bonded) to a portion of the back surface of the flexible display panel, in accordance with some embodiments of the present disclosure.
- FIG. 5 schematically illustrates a cross-sectional view of a flexible display device in a bent state with a flexible member adhered to a portion of the back surface of the flexible display panel, in accordance with some embodiments of the present disclosure.
- FIG. 6 schematically illustrates an enlarged cross-sectional view of a layer of flexible member in an unbent state, in accordance with some embodiments of the present disclosure.
- FIG. 7 schematically illustrates an enlarged cross-sectional view of a flexible display device including a layer of flexible elements in a bent state, in accordance with some embodiments of the present disclosure.
- FIG. 8 schematically illustrates an enlarged cross-sectional view of a two-layer flexible member in an unbent state, in accordance with some embodiments of the present disclosure.
- FIG. 9 schematically illustrates an enlarged cross-sectional view of a flexible display device including two layers of flexible elements in a bent state, in accordance with some embodiments of the present disclosure.
- Fig. 10 schematically shows a top view of a flexible member with a plurality of holes.
- Figure 11 schematically shows a cross-sectional view of a flexible member with a plurality of holes.
- FIG. 12 is a schematic diagram of a method of fabricating a flexible display device in accordance with some embodiments of the present disclosure.
- some embodiments of the present disclosure provide a flexible member adapted to be disposed on a flexible display panel, the flexible member comprising: a first base layer and a second base layer disposed opposite to each other; and sandwiching the first base layer And a buffer layer between the second substrate, wherein the flexible member is bendable about a bending axis, and the projection of the buffer layer on a plane perpendicular to the bending axis is wavy.
- the flexible member Since the flexible member has a certain mechanical strength and excellent flexibility, when it is disposed on the surface of the non-display substrate of the flexible display panel (ie, the back surface of the flexible display panel),
- the utility model can improve the overall strength of the flexible display panel, enhance the impact resistance and bending resistance of the flexible display panel, and provide support for the bending region, thereby avoiding failures such as “creases” and “white lines” caused by the concentration of bending stress.
- the present disclosure exemplifies an OLED display panel in which a top emission (ie, a surface facing away from the flexible component 1 is an emitting surface, that is, a display surface) is exemplified in detail, according to some embodiments of the present disclosure.
- the flexible member 1 disposed on the surface of the non-display substrate of the flexible display panel 3 ie, the back surface of the flexible display panel 3, that is, the lower surface of the flexible display panel 3 in FIG.
- the flexible member 1 includes: a first base layer 11 disposed opposite to each other a second base layer 12; and a buffer layer 15 sandwiched between the first base layer 11 and the second base layer 12, wherein the flexible member 1 is bendable about a bending axis (not shown), and the The projection of the buffer layer 15 on a plane perpendicular to the bending axis is wavy. Since the flexible member 1 has a certain mechanical strength and excellent flexibility, when it is disposed on the surface of the non-display substrate of the flexible display panel 3, the overall strength, bending resistance, and impact resistance of the flexible display panel 3 can be improved.
- the impact resistance and bending resistance of the flexible display panel 3 are enhanced, and the bending region is provided with support to avoid failures such as “creases” and “white lines” caused by the concentration of bending stress. Further, when the display is performed using the flexible display panel 3, display can be performed without first removing the flexible member.
- the flexible component 1 may further include: a first fixing layer 13 disposed between the first base layer 11 and the buffer layer 15; and a first portion 12 disposed between the second base layer 12 and the buffer layer 15 Two fixed layers 14.
- Two fixing layers 13, 14 are disposed between the first base layer 11, the second base layer 12 and the buffer layer 15, which facilitates better fixing of the buffer layer 15 to improve the support stability of the buffer layer 15 and the support during support. Force uniformity (load uniformity).
- first pinned layer 13 and the second pinned layer 14 may be an adhesive layer, mainly functioning to fix the first base layer 11, the second base layer 12, and the buffer layer 15.
- the bending resistance of the entire flexible member 1 is further improved by the relative shear displacement of the adhesive layer and the slip on the microstructure.
- the wavy shape of the buffer layer 15 is a zigzag or sinusoidal waveform.
- the zigzag or sinusoidal waveform is not only easy to manufacture, but also saves manufacturing costs.
- the inventors have also experimentally proved that the shape of the buffer layer 15 is set to a zigzag or sinusoidal waveform, and the overall strength and impact resistance of the flexible display panel 13 can be well satisfied. Sex and bending resistance requirements.
- the flexible element may comprise a wave-shaped buffer layer or may comprise two or more wave-shaped buffer layers.
- each adjacent undulating buffer layer is separated by a spacer layer, and the spacer layer and each buffer layer may be bonded by a bonding layer.
- the respective wavy buffer layers may be different in shape and size.
- the material of the buffer layer 15 may be metal (for example, may be in the form of a metal foil).
- the metal is at least one of the following materials: a shape memory alloy (for example, a heat-stimulated shape memory alloy), a spring steel, a high hardness stainless steel, a hardened aluminum, and an aluminum alloy.
- the shape memory alloy is a superelastic titanium nickel alloy.
- the metal material enables the flexible member 1 to have a certain mechanical strength, and when it is disposed on the back surface of the flexible display panel 13, the overall strength of the flexible display panel 13 can be improved. In particular, when the metal material is a shape memory alloy, the bending resistance of the flexible display panel 13 and the recovery ability after bending can be enhanced.
- the material of the buffer layer 15 is a metal foil, it is characterized by relatively good hardness and rigidity, and has high elastic strength limit and good elastic recovery deformation ability. It should be noted that the material of the buffer layer 15 is not limited to metal as long as it satisfies the support and the requirement for the bending performance of the flexible display device 4.
- the first base layer 11 and the second base layer 12 are made of a flexible material having a bending recovery property.
- the first base layer 11 and the second base layer 12 are respectively a planar substrate having a certain strength and bending recovery, which may be the same as the material of the intermediate wave buffer layer 15, and may be, for example, a metal.
- a plurality of holes 18 are respectively formed in the first base layer 11 and the second base layer 12 (see FIGS. 10-11). Each of the plurality of holes extends in the same direction as the bending axis.
- the manufacturing method of the hole 18 is not limited to the mechanical opening process, and may be any pattern design method, as long as the specific design shapes of the first and second base layers 11 and 12 can be realized, for example, photolithography and laser processing methods. , machining methods, etc.
- the distribution density of the plurality of holes 18 in the bending region where the radius of curvature of the first base layer 11 is large is larger than the distribution density in the bending region where the radius of curvature of the first base layer 11 is small.
- the distribution density of the plurality of holes 18 in the bent region where the radius of curvature of the second base layer 12 is large is larger than the distribution density in the bent region where the radius of curvature of the second base layer 12 is small.
- the flexible member 1 has a total thickness of 50 to 3000 ⁇ m in a direction perpendicular to the first base layer 11 and the second base layer 12.
- the two endpoint values of 50 micrometers and 3000 micrometers were finally obtained after repeated experiments by the inventors of the present application. Experiments have shown that if the total thickness of the flexible member 1 is less than 50 ⁇ m, the predetermined support function cannot be achieved if the total thickness of the flexible member 1 is greater than 3000 ⁇ m; the bending performance cannot meet the requirements; the total thickness of the flexible member 1 is 50-3000. Both strength and flexibility are considered in the micrometer range.
- the buffer layer 15 has a thickness of 40 to 1000 ⁇ m in a direction perpendicular to the first base layer and the second base layer.
- the buffer layer has a thickness of 30-300 microns.
- the two endpoint values of 40 micrometers and 1000 micrometers were finally obtained after repeated experiments by the inventors of the present application. Experiments have shown that if the thickness of the buffer layer 15 is less than 40 micrometers, the buffering function is insufficient; if the thickness of the buffer layer 15 is more than 1000 micrometers, the bending flexibility requirement cannot be satisfied; when the thickness of the buffer layer 15 is in the range of 40-1000 micrometers Both cushioning and flexibility.
- a flexible display device 4 comprising: at least one of the above-described flexible members 1; an adhesive layer 2; and a flexible display panel 3, wherein the at least one flexible member 1 A base layer 11 and the non-display substrate of the flexible display panel 4 are bonded together by the adhesive layer 2.
- the adhesive layer 2 is a pressure sensitive adhensive (PSA).
- PSA pressure sensitive adhensive
- the at least one flexible element 1 may be a plurality of flexible elements 1 which are superposed on each other and bonded together.
- two flexible elements 1 in the form of two layers are shown in Figures 8 and 9.
- Another aspect of the present disclosure also provides a method of fabricating a flexible display device 4, comprising the steps of: providing at least one of the flexible elements 1 described above; providing a flexible display panel 3; and disposing the at least one through the adhesive layer 2
- the first base layer 11 of the flexible member 1 is bonded to the non-display substrate of the flexible display panel 3 to form the flexible display device 4.
- the step of providing the flexible component 1 specifically includes: providing the first base layer 11 and the second base layer 12; providing the buffer layer 15; and buffering the orientation of the first base layer 11 and the second base layer 12
- the surface of the layer 15 is respectively coated with the first pinned layer 13 and the second pinned layer 14 having an adhesive layer; finally, the buffer layer 15 is fixedly sandwiched and bonded to the first pinned layer 13 and the second pinned layer 14 Between to form the flexible member 1.
- the flexible member 1 Since the flexible member 1 has a certain mechanical strength and excellent flexibility, when it is disposed on the surface of the non-display substrate of the flexible display panel 3, the overall strength, bending resistance, and impact resistance of the flexible display panel 3 can be improved.
- the impact resistance and bending resistance of the flexible display panel 3 are enhanced, and the bending region is provided with support to avoid failures such as “creases” and “white lines” caused by the concentration of bending stress. Further, when the display is performed using the flexible display panel 3, display can be performed without first removing the flexible member.
- the terms “first” and “second” are used for descriptive purposes only, and are not intended to indicate or imply relative importance, and are not necessarily used to describe a sequential order or a chronological order.
- the term “plurality” refers to two or more, unless specifically defined otherwise. “Upper”, “lower”, “left”, “right”, etc. are only used to indicate the relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may also change accordingly.
- the term “comprising” may mean “consisting of” in one embodiment, but may also mean “including at least the defined species and optionally one or more other species” in another embodiment. ".
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Abstract
Description
Claims (15)
- 一种适于设置在柔性显示面板的柔性元件,该柔性元件包括:相对设置的第一基层和第二基层;以及夹于所述第一基层和第二基层之间的至少一个缓冲层,其中,该柔性元件能够绕一弯折轴线进行弯折,且该至少一个缓冲层在垂直于该弯折轴线的平面上的投影呈波状。
- 根据权利要求1所述的柔性元件,还包括:设置在该第一基层和该至少一个缓冲层之间的第一固定层;以及设置在该第二基层和该至少一个缓冲层之间的第二固定层。
- 根据权利要求3所述的柔性元件,其中,所述第一固定层和第二固定层为粘性层。
- 根据权利要求1所述的柔性元件,其中,所述至少一个缓冲层的材料为金属。
- 根据权利要求4所述的柔性元件,其中,所述金属为下列材料中的至少一种:形状记忆合金、弹簧钢、高硬度不锈钢、硬化铝及铝合金。
- 根据权利要求1所述的柔性元件,其中,所述波状为锯齿形或正弦波形。
- 根据权利要求1所述的柔性元件,其中,所述第一基层和第二基层由具有弯折回复性的柔性材料制成。
- 根据权利要求1所述的柔性元件,其中,所述第一基层和第二基层中分别开设有多个孔洞。
- 根据权利要求8所述的柔性元件,其中,所述多个孔洞在所述第一基层的曲率半径较大的弯折区域中的分布密度大于其在所述第一基层的曲率半径较小的弯折区域中的分布密度;且所述多个孔洞在所述第二基层的曲率半径较大的弯折区域中的分布密度大于其在所述第二基层的曲率半径较小的弯折区域中的分布密度。
- 根据权利要求8所述的柔性元件,其中,所述多个孔洞中每个孔洞的延伸方向和所述弯折轴线的方向相同。
- 根据权利要求1所述的柔性元件,其中,所述至少一个缓冲层为多个缓冲层,各相邻缓冲层之间由间隔基层隔开,所述间隔基层与 各缓冲层之间可通过粘结层进行粘结,且所述多个缓冲层在形状和/或尺寸上互不相同。
- 一种柔性显示设备,其包括:至少一个根据权利要求1-11中任一项所述的柔性元件;黏接层;以及柔性显示面板,其中,所述至少一个柔性元件的第一基层与所述柔性显示面板的非显示基板通过所述黏接层黏接在一起。
- 根据权利要求12所述的柔性显示设备,其中,所述黏接层为压敏胶。
- 根据权利要求13所述的柔性显示设备,其中,所述至少一个柔性元件为多个柔性元件,所述多个柔性元件相互叠置并黏合在一起。
- 一种柔性显示设备的制作方法,包括以下步骤:提供至少一个根据权利要求1-11中任一项所述的柔性元件;提供柔性显示面板;以及通过黏接层将所述至少一个柔性元件的第一基层与所述柔性显示面板的非显示基板黏接在一起,以形成柔性显示设备。
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