Rollable display device

Abstract

A rollable display device includes a substrate, a display element, a circuit element, and a support layer. The substrate has a bending portion and a rollable portion. The display element is disposed on the rollable portion. The circuit element is disposed on the bending portion and electrically connected to the display element. The support layer is disposed under the substrate, wherein the support layer is attached to the rollable portion and the support layer is not attached to at least a portion of the bending portion.

Description

Technical Field

[0001] This invention relates to a rollable display device, and more particularly to a rollable display device that can be folded or unfolded. Background Technology

[0002] In recent years, rollable displays have become a key area of ​​development in the display device field. As user demands for rollable displays increase, their flexibility needs further improvement to enhance the user experience. However, the stress generated when existing rollable displays are folded or unfolded can damage the device, thus affecting its lifespan. Therefore, improving the flexibility of rollable displays or reducing the stress during folding or unfolding remains an important issue in this field. Summary of the Invention

[0003] To address the aforementioned problems, in some embodiments, the present invention provides a rollable display device. The rollable display device includes a substrate, a display element, a circuit element, and a support layer. The substrate has a curved portion and a rollable portion. The display element is disposed on the rollable portion. The circuit element is disposed on the curved portion and electrically connected to the display element. The support layer is disposed under the substrate, wherein the support layer is attached to the rollable portion, and the support layer is not attached to at least a portion of the curved portion. Attached Figure Description

[0004] Figure 1 This is a cross-sectional schematic diagram of an electronic device according to the first embodiment of the present invention.

[0005] Figure 2 for Figure 1 A partially enlarged schematic diagram of the electronic device shown.

[0006] Figures 3 to 7 This is a schematic diagram illustrating the manufacture of an electronic device according to the first embodiment of the present invention.

[0007] Figure 8 This is a manufacturing process diagram of the electronic device according to the first embodiment of the present invention.

[0008] Figure 9 This is a cross-sectional schematic diagram of an electronic device according to a second embodiment of the present invention.

[0009] Figure 10 This is a cross-sectional schematic diagram of an electronic device according to a third embodiment of the present invention.

[0010] Figure 11 This is a cross-sectional schematic diagram of an electronic device according to the fourth embodiment of the present invention.

[0011] Figure 12This is a top view schematic diagram of the substrate of the electronic device according to the fifth embodiment of the present invention.

[0012] Explanation of reference numerals: 100 - Rollable display device; 102 - Substrate; 800 - Manufacturing method; A1, P2, P1, P3, P5, A2, A4, A5, A3, P7 - Parts; P4 - First part; P6 - Second part; AD1 - First adhesive layer; AD2 - Second adhesive layer; AD3 - Third adhesive layer; AR1 - Region; BF - Buffer layer; BP - Bending portion; CA - Axis; CE - Circuit element; CO - Cover layer; CR - Carrier plate; CT - Contact element; D1, D2 - Distance; DE - Display element; DR1 - First direction; DR2 - Second direction; DRE - Drain; DU - Drive unit; E1 - First side end; E2 - Second side end; EL1 - First electrode; EL2 - Second electrode; FA - Bending shaft; FL - Organic material layer; GE - Gate; GL - Adhesive layer; HL1, HL2 - Horizontal extension lines; IL1, IL2, IL3, IL4, EN, IL 5 - Insulating layer; IOL - Inorganic layer; LEL - Light-emitting layer; LU - Light-emitting unit; NRP - Non-curable portion; OL1 - First organic layer; OL2 ​​- Second organic layer; OP - Optical layer; OPE - Opening; PDL - Pixel definition layer; PG - Protective adhesive; PL - Support plate; R1, R2 - Radius; RE, RE1, RE2 - Groove; RP - Curable portion; BPS, RPS, NPS - Surface portion; S1 - Lower surface; S2 - Upper surface S802, S804, S806, S808, S810, S812 - Steps; SC - Reel; SD - Unfold / fold direction; SMC - Semiconductor layer; SOE - Source electrode; SUP - Support layer; T1, T2, T3, T4, T5, T6, T7, T9, T10, T2', T3' - Thickness; TE - Touch layer; TEL - Tear line; TU - Touch electrode; VC1, VC2 - Virtual circles; W1, W2 - Width. Detailed Implementation

[0013] The present invention can be understood by referring to the following detailed description in conjunction with the accompanying drawings. It should be noted that, for ease of understanding and for the sake of brevity, many of the accompanying drawings depict only a portion of the electronic device, and specific elements in the drawings are not drawn to scale. Furthermore, the number and size of the elements in the drawings are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0014] Throughout this specification and the appended claims, certain terms are used to refer to specific elements. Those skilled in the art will understand that electronic device manufacturers may use different names to refer to the same elements. This document is not intended to distinguish between elements that have the same function but different names.

[0015] In the specification and claims, words such as "containing" and "including" are open-ended terms, and therefore should be interpreted as "containing but not limited to...".

[0016] It should be understood that when an element or membrane is referred to as being "set on" or "connected to" another element or membrane, it can be directly on or directly connected to that other element or membrane, or there may be an inserted element or membrane between them (indirect cases). Conversely, when an element is referred to as being "directly on" or "directly connected to" another element or membrane, there may be no inserted element or membrane between them. When an element or membrane is referred to as being "electrically connected" to another element or membrane, it can be interpreted as either a direct electrical connection or an indirect electrical connection.

[0017] The terms “approximately,” “equal to,” “same as,” “substantially,” or “roughly” are generally interpreted as being within plus or minus 20% of the given value, or within plus or minus 10%, plus or minus 5%, plus or minus 3%, plus or minus 2%, plus or minus 1%, or plus or minus 0.5% of the given value.

[0018] Although the terms "first," "second," "third," etc., can be used to describe multiple components, the components are not limited to these terms. These terms are used only to distinguish a single component from other components in the specification. The same terms may not be used in the claims, but rather replaced by "first," "second," "third," etc., according to the order of the elements declared in the claims. Therefore, in the following description, a first component may be a second component in the claims.

[0019] It should be understood that the technical features of several different embodiments can be replaced, reorganized, or mixed to complete other embodiments without departing from the spirit of the present invention.

[0020] Please refer to Figure 1 and Figure 2 , Figure 1 This is a cross-sectional schematic diagram of the electronic device according to the first embodiment of the present invention. Figure 2 for Figure 1 A partially enlarged schematic diagram of the electronic device shown, for example, Figure 1 An enlarged schematic diagram of the middle portion A1 is shown, but it is not limited thereto. According to the present invention, Figure 1 and Figure 2The illustrated electronic device includes a rollable display device 100, which can display static or dynamic images or screens according to the user's needs and operation, but is not limited thereto. The rollable display device 100 can be applied, for example, to laptops, public displays, video wall displays, automotive displays, touch displays, televisions, monitors, smartphones, tablets, light source modules, lighting equipment, or other electronic devices used in the aforementioned products, but is not limited thereto. Furthermore, in this invention, the rollable display device 100 may, for example, include a rollable display panel or an extended display panel, and can be rolled up and / or folded by the user, but is not limited thereto.

[0021] According to this embodiment, as Figure 1 As shown, the rollable display device 100 may include a substrate 102, a display element DE, a circuit element CE, and a support layer SUP, but is not limited thereto. The substrate 102 has a curved portion BP and a rollable portion RP. The substrate 102 has a lower surface S1 and an upper surface S2 opposite to the lower surface S1. The display element DE may be disposed on the rollable portion RP, specifically on the upper surface S2 of the rollable portion RP of the substrate 102. The circuit element CE may be disposed on the curved portion BP and electrically connected to the display element DE. The support layer SUP may be disposed under the substrate 102, specifically on the lower surface S1 of the substrate 102. The support layer may be attached to the rollable portion RP, and the support layer SUP is not attached to at least a portion of the curved portion BP. The elements and / or film layers included in the rollable display device 100 will be described in detail below. According to some embodiments, the attachment method may be adhesive attachment, electrostatic attachment, or a combination of the above two methods.

[0022] In this embodiment, the side edges of the substrate 102 extend, for example, along the first direction DR1 and the second direction DR2, but are not limited thereto. The substrate 102 may include a flexible substrate or at least partially a flexible substrate, but is not limited thereto. The material of the flexible substrate may be a plastic, such as polyimide (PI), polycarbonate (PC), polyethylene terephthalate (PET), other suitable materials, or combinations thereof. Furthermore, although Figure 1 The substrate 102 is shown as a single layer, but this embodiment is not limited thereto. In some embodiments, the substrate 102 may include a multilayer structure.

[0023] like Figure 1As shown, the rollable display device 100 may include, for example, a scroll SC, wherein the scroll SC may have a central axis CA. When the scroll SC moves along the unfolding-folding direction SD, a portion P2 of the rollable display device 100 may change its degree of curling as the scroll SC moves, thereby enabling the rollable display device 100 to be folded and / or unfolded. A portion P1 of the rollable display device 100 may remain flat during the folding or unfolding process and may not be curled or have its degree of curling changed due to the movement of the scroll SC. In this embodiment, a portion P3 of the rollable display device 100 may be bent backward toward the back of the rollable display device 100, that is, bent toward the lower surface S1 of the substrate 102, but is not limited thereto. A portion P3 of the rollable display device 100 may, for example, be a portion of the rollable display device 100 that does not display an image, and may, for example, be used to set peripheral components (e.g., circuit elements CE).

[0024] According to this embodiment, the substrate 102 may further include a non-rollable portion NRP disposed between the bending portion BP and the rollable portion RP. A support layer SUP is attached to the non-rollable portion NRP. Specifically, the rollable portion RP of the substrate 102 may be a portion of the substrate 102 that curls or changes in the degree of curl due to the unfolding or retraction of the rollable display device 100. In other words, as the scroll SC moves along the unfolding-retraction direction SD, the rollable portion RP of the substrate 102 can be rolled or unfolded, and the curled portion of the rollable portion RP may change depending on the degree of unfolding of the rollable display device 100. The rollable portion RP of the substrate 102 may substantially correspond to portion P2 of the rollable display device 100. The bent portion BP of substrate 102 is a part of substrate 102 that is bent to the back side (one side of the lower surface S1 of substrate 102) of the rollable display device 100 and fixed therein. The degree of bending of the bent portion BP of substrate 102 does not change during the folding or unfolding of the rollable display device 100. The bent portion BP of substrate 102 can substantially correspond to portion P3 of the rollable display device 100. The non-rollable portion NRP of substrate 102 can be a substantially flat portion of substrate 102, or, in other words, a portion other than the bent portion BP that does not curl due to the movement of the scroll SC. According to this embodiment, the non-rollable portion NRP of substrate 102 can be, for example, a portion of substrate 102 other than the rollable portion RP and the bent portion BP, but is not limited thereto. The non-rollable portion NRP of substrate 102 can substantially correspond to portion P1 of the rollable display device 100.

[0025] In this embodiment, the ranges of the curved portion BP, the non-rollable portion NRP, and the rollable portion RP can be defined, for example, when the rollable display device 100 is in a fully folded (or fully unfolded) state. Specifically, Figure 1The rollable display device 100 shown is in a fully unfolded state. In this state, the rollable portion RP of the substrate 102 can be defined as the portion of the substrate 102 that begins to curl (or, the portion that begins to deviate from the horizontal extension line HL1 parallel to the first direction DR1) from the point near the spool SC to the first side end E1 of the substrate 102 near the spool SC. The bent portion BP of the substrate 102 can be, for example, the portion of the substrate 102 that begins to bend (or, the portion that begins to deviate from the horizontal extension line HL2 parallel to the first direction DR1) from the point away from the spool SC to the second side end E2 of the substrate 102 away from the spool SC. The non-rollable portion NRP of the substrate 102 can be any portion of the substrate 102 other than the bent portion BP and the rollable portion RP, or the portion between the bent portion BP and the rollable portion RP, but is not limited thereto. The aforementioned first direction DR1 can be, for example, parallel to the extension direction or the unfolding-folding direction SD of the rollable display device 100, but is not limited thereto. It should be noted that the above definitions of the curved portion BP, the non-rollable portion NRP, and the rollable portion RP are merely exemplary and are not intended to limit the invention. Furthermore, in some embodiments, the rollable display device 100 may include a storage element corresponding to the rollable portion RP. When the rollable display device 100 is not fully unfolded, this storage element can be used to store the un-unfolded portion of the rollable display device 100 (i.e., the un-unfolded rollable portion RP), but this is not a limitation.

[0026] According to this embodiment, the display area (not shown in the figure) of the rollable display device 100 can generally correspond to the area where the display element DE is disposed, while the peripheral area of ​​the rollable display device 100 can be defined, for example, as other areas in the rollable display device 100 besides the display area, but is not limited thereto. Accordingly, the non-rollable portion NRP and the rollable portion RP on which the display element DE is disposed can, for example, correspond to the display area of ​​the rollable display device 100. The curved portion BP on which no display element DE is disposed can correspond to the peripheral area of ​​the rollable display device 100, but is not limited thereto. Furthermore, since the display area of ​​the rollable display device 100 can partially correspond to the rollable portion RP of the substrate 102, the screen size of the display area can be adjusted according to the user's needs by changing the degree of folding or unfolding of the rollable display device 100. For example, after the rollable display device 100 is unfolded, the screen size of the display area in the rollable display device 100 can be increased.

[0027] According to this embodiment, the display element DE may, for example, include any suitable light-emitting element and a driving element for driving the light-emitting element. For the sake of simplicity, the drawings are... Figure 1 The display element DE is shown as a single layer, while the detailed structure of the display element DE can be found in [reference needed]. Figure 2The structure is shown. The display element DE may include, for example, self-emissive elements or non-self-emissive elements, but is not limited thereto. Self-emissive elements may include, for example, organic light-emitting diodes (OLEDs), quantum dot light-emitting diodes (QLEDs), inorganic light-emitting diodes (LEDs), any other suitable light-emitting elements, or combinations thereof. Inorganic light-emitting diodes may include, for example, mini LEDs or micro LEDs, but are not limited thereto. In one embodiment, the chip size of the light-emitting diode may be from about 300 micrometers (μm) to 10 millimeters (mm), the chip size of the mini LED may be from about 100 micrometers to 300 micrometers, and the chip size of the micro LED may be from about 1 micrometer to 100 micrometers, but is not limited thereto. In some embodiments, when the display element DE includes non-self-emissive elements, it may include, for example, liquid crystal cells and pixel electrodes for controlling the rotation of the liquid crystal, but is not limited thereto. (The following and...) Figure 2 The example described uses an organic light-emitting diode (OLED) element as an example of a display element DE, but the display element DE in this embodiment is not limited thereto.

[0028] like Figure 2 As shown, the display element DE may include at least one light-emitting unit LU, wherein the light-emitting unit LU may include a first electrode EL1, a second electrode EL2, and a light-emitting layer LEL disposed between the first electrode EL1 and the second electrode EL2. The first electrode EL1 and the second electrode EL2 may serve as the anode and cathode of the light-emitting unit LU, respectively, but are not limited thereto. The first electrode EL1 and the second electrode EL2 may, for example, include metal oxides, metallic materials, other suitable conductive materials, or combinations thereof. For example, the first electrode EL1 may include a metallic material, and the second electrode EL2 may include a transparent conductive material, such as indium tin oxide (ITO), but are not limited thereto. In addition, the display element DE may also include at least one driving unit DU, wherein the driving unit DU may, for example, include a thin film transistor (TFT), and may include a gate GE, a source SOE, a drain DRE, a semiconductor layer SMC, and an insulating layer IL1, wherein the insulating layer IL1 may be located between the gate GE and the semiconductor layer SMC. According to this embodiment, the driving unit DU may be electrically connected to the light-emitting unit LU, thereby driving the light-emitting unit LU to generate light. For example, as Figure 2 As shown, the drain DRE of the drive unit DU can be electrically connected to the first electrode EL1 of the light-emitting unit LU, for example, through the contact CT, but is not limited thereto. Figure 2 The thin-film transistors used are merely examples, and the present invention is not limited thereto. The driving unit DU may be a top-gate, bottom-gate, or a combination thereof.

[0029] like Figure 2 As shown, in some embodiments, the display element DE may further include a pixel definition layer PDL disposed between the light-emitting layers LEL, wherein the pixel definition layer PDL may include at least one opening OPE, and the light-emitting layer LEL may be disposed in the opening OPE. The display element DE may also include, for example, a buffer layer BF, an optical layer OP, and a cover layer CO, but is not limited thereto. The buffer layer BF may be disposed on the substrate 102 and may include, for example, any suitable buffer material. The driving unit DU may be disposed on the buffer layer BF. The optical layer OP may be disposed on the light-emitting unit LU, and may include, for example, a polarizing layer, an anti-reflective layer, or a combination thereof, but is not limited thereto. The cover layer CO may be disposed on the optical layer OP for protecting the film layers or elements in the rollable display device 100, wherein the cover layer CO may include, for example, glass, plastic, polymer, other suitable protective materials, or a combination of the above materials, but is not limited thereto. In some embodiments, the display element DE may also include, for example, a touch layer TE disposed on the light-emitting unit LU. The touch layer TE may include a plurality of touch electrodes TU to provide touch functionality of the rollable display device 100, but is not limited thereto. For ease of explanation, Figure 2 The displayed touch layer TE is a single layer. According to some embodiments, the touch layer TE may be multi-layered, such as two layers. The material of the touch electrode TU may include a metallic conductive material, a transparent conductive material, or a combination of the above materials. Figure 2 As shown, the display element DE may further include insulating layers IL2 and IL3 disposed on insulating layer IL1, insulating layer IL4 disposed on second electrode EL2, insulating layer EN disposed on insulating layer IL4, and insulating layer IL5 disposed on touch layer TE, but is not limited thereto. In some embodiments, such as Figure 2 As shown, the display element DE may also include a third adhesive layer AD3, and the optical layer OP may be attached to the insulating layer IL5 on the touch layer TE through the third adhesive layer AD3, but is not limited thereto.

[0030] In this embodiment, the circuit element CE may include any active and / or passive element suitable for application in the rollable display device 100. Specifically, the circuit element CE may include, but is not limited to, driving elements (e.g., gate drive circuits), flexible printed circuit boards (FPCs), printed circuit boards (PCBs), chip-on-film (COF) films, integrated circuits (ICs), or combinations thereof formed via thin-film processing. Figure 1As shown, since no display element DE is provided on the bent portion BP of the substrate 102 in this embodiment, the bent portion BP can be bent backward to the back of the rollable display device 100 and fixed. In this way, the effect of narrow bezels or increased screen ratio can be achieved.

[0031] like Figure 1 As shown, the bent portion BP can be bent or flexed, for example, along a bending axis FA, but is not limited thereto. Figure 1 As shown, the bending state of the bent portion BP can be such that different portions of the same surface of the substrate 102 are bent parallel to each other. Specifically, the surface portion NPS corresponding to the non-rollable portion NRP and the surface portion BPS corresponding to the bent portion BP and near the second side end E2 on the lower surface S1 of the substrate 102 are approximately parallel, but not limited to this. In this case, a virtual circle VC1 can be defined on the surface of the bent portion BP near the bending axis FA, that is, on the inner surface of the bent portion BP. The virtual circle VC1 can be tangent to the surface portion NPS and the surface portion BPS and has a center, and the radius R1 of the virtual circle VC1 can be defined as the radius of curvature of the bent portion BP. In this embodiment, the center of the virtual circle VC1 can, for example, overlap with the bending axis FA, but is not limited to this. The radius of curvature of the bent portion BP of the substrate 102 can be defined by the above method.

[0032] like Figure 1 As shown, the rollable portion RP can be bent or folded, for example, along the axis CA of the spool SC, but is not limited thereto. Similarly, in a bent state, different portions of the same surface of the substrate 102 can be bent parallel to each other. Specifically, the surface portion NPS corresponding to the non-rollable portion NRP and the surface portion RPS corresponding to the rollable portion RP and near the first side end E1 on the lower surface S1 of the substrate 102 are made substantially parallel, but are not limited thereto. In this case, a virtual circle VC2 can be defined on the surface of the rollable portion RP near the axis CA, that is, on the inner surface of the rollable portion RP. The virtual circle VC2 can be tangent to the surface portion NPS and the surface portion RPS and has a center, and the radius R2 of the virtual circle VC2 can be defined as the radius of curvature of the rollable portion RP. In this embodiment, the center of the virtual circle VC2 can, for example, overlap with the axis CA of the spool SC, but is not limited thereto. The radius of curvature of the rollable portion RP of the substrate 102 can be defined using the above method.

[0033] After defining the radius of curvature, the curvature (the reciprocal of the radius of curvature) of the bent portion BP and the rollable portion RP can be further defined. In some embodiments, the curvature of the bent portion BP and the rollable portion RP can be confirmed by visual observation or by observation with an optical microscope. It should be noted that the definition of the radius of curvature R1 of the bent portion BP and the radius of curvature R2 of the rollable portion RP in this embodiment is not limited to the above-described method. In some embodiments, when it is difficult to define the virtual circle VC1 of the bent portion BP and the virtual circle VC2 of the rollable portion BP, for example, when the bent portion BP and the rollable portion RP present an irregular shape when bent, the radius of curvature of the bent portion BP and the rollable portion RP can be defined by measuring the distance between two mutually facing and parallel parts on the same surface of the substrate 102, but this is not a limitation. In detail, as Figure 1 As shown, in the curved portion BP, the distance D1 between the mutually facing and parallel surface portions BPS and NPS can be measured, wherein the radius of curvature R1 of the curved portion BP can be half of the distance D1 (i.e., D1 = 2R1). Similarly, in the rollable portion RP, the distance D2 between the mutually facing and parallel surface portions RPS and NPS can be measured, wherein the radius of curvature R2 of the rollable portion RP can be half of the distance D2 (i.e., D2 = 2R2), but is not limited thereto. The above definitions of curvature and radius of curvature of the curved portion BP and the rollable portion RP can be applied to various embodiments of the present invention, and therefore will not be repeated hereafter.

[0034] According to this embodiment, when the radius of curvature R1 of the bending portion BP decreases, the narrow bezel effect of the rollable display device 100 can be improved or the screen-to-body ratio can be increased; while when the radius of curvature R2 of the bending portion RP decreases, the overall thickness of the rollable display device 100 can be reduced, thereby reducing the product volume. Therefore, in this embodiment, the performance of the rollable display device 100 can be improved by reducing the radii of curvature R1 and R2. Furthermore, since the bending portion BP is fixed after bending, while the rollable portion RP can be continuously rolled up as the rollable display device 100 is folded and unfolded, the stress borne by the rollable portion RP may be greater than the stress borne by the bending portion BP during the use of the rollable display device 100. Accordingly, as Figure 1 As shown, in this embodiment, the radius of curvature R1 of the bent portion BP can be designed, for example, to be smaller than the radius of curvature R2 of the rollable portion RP. That is, the curvature of the bent portion BP can be greater than the curvature of the rollable portion RP. In this way, the stress that the rollable portion RP can withstand can be increased, thereby reducing the chance of damage to the rollable portion RP or the display element DE corresponding to the rollable portion RP during the retraction / unfolding process of the rollable display device 100. The above-described relationship between the radius of curvature and curvature of the bent portion BP and the rollable portion RP can be applied to various embodiments of the present invention, and therefore will not be repeated hereafter.

[0035] A support layer SUP disposed on the lower surface S1 of the substrate 102 provides support for the rollable display device 100. In some embodiments, the material of the support layer SUP may be the same as the material of the substrate 102, and reference may be made to the above description regarding the material of the substrate 102, but it is not limited thereto. According to some embodiments, the support layer SUP is not attached to at least a portion of the bend BP. Figure 1 As shown, a portion of the support layer SUP, P7, is attached to the bend BP near the second side end E2, while the remaining portion of the bend BP has no support layer SUP attached. According to some embodiments, although not shown in the figure, the support layer SUP corresponding to the bend BP can be completely removed. That is, the support layer SUP may not be attached to any part of the bend BP.

[0036] like Figure 1 As shown, the support layer SUP is attached to the non-curlable NRP portion (e.g. Figure 1 The first portion P4 shown may have a thickness T1. According to some embodiments, the radius of curvature R1 of the bent portion BP of the substrate 102 may be less than 20 times the thickness T1 of the first portion P4. According to some embodiments, the radius of curvature R2 of the rollable portion RP of the substrate 102 may be greater than or equal to 20 times the thickness T1 of the first portion P4. According to some embodiments, the support layer SUP may not be correspondingly attached to the bent portion BP or the rollable portion RP, thereby reducing the influence of the support layer SUP on the flexibility of the bent portion BP or the rollable portion RP, but this is not a limitation. For example, in this embodiment, the thickness T1 of the support layer SUP corresponding to the non-rollable portion NRP can range from, for example, 50 micrometers (μm) to 100 micrometers (50 μm ≤ thickness T1 ≤ 100 μm). When the thickness T1 is 50 micrometers, the radius of curvature R1 of the curved portion BP can be, for example, less than 1000 micrometers (radius of curvature R1 < 1000 μm), and the radius of curvature R2 of the rollable portion RP can be, for example, greater than or equal to 1000 micrometers (1000 μm ≤ radius of curvature R2), but is not limited thereto. In this invention, the thickness measurement of each film layer can be performed at a position at least 10 micrometers away from the edge of the film layer. The thickness can be measured at the aforementioned position for film layers such as the support layer, substrate, first organic layer, second organic layer, inorganic layer, etc., but is not limited thereto.

[0037] According to this embodiment, since the support layer SUP can be attached to the non-rollable portion NRP, it provides support for the non-rollable portion NRP and the corresponding display element DE disposed on the non-rollable portion NRP. The non-rollable portion NRP of the substrate 102 remains substantially flat and will not be bent or kinked due to the folding or unfolding of the rollable display device 100. According to some embodiments, the support layer SUP can be attached to the rollable portion RP to provide support, thereby reducing the chance of the rollable portion RP and the corresponding display element DE disposed on the rollable portion RP being damaged during the folding or unfolding of the rollable display device 100. Furthermore, according to some embodiments, the radius of curvature R2 of the rollable portion RP can be designed to be greater than or equal to 20 times the thickness T1 of the portion of the support layer SUP corresponding to the non-rollable portion NRP, thereby reducing the influence of the support layer SUP on the flexibility of the rollable portion RP and improving the user experience of the rollable display device 100. According to some embodiments, the curved portion BP can be bent to the back of the rollable display device 100 to improve the screen-to-body ratio of the rollable display device 100. Therefore, the flexibility of the curved portion BP can be improved by not attaching the support layer SUP to at least a portion of the curved portion BP. Furthermore, according to some embodiments, since the support layer SUP can be not attached to the curved portion BP, the radius of curvature R1 of the curved portion BP can be less than 20 times the thickness T1 of the portion of the support layer SUP corresponding to the non-rollable portion NRP, thereby reducing the radius of curvature R1 of the curved portion BP and further improving the screen-to-body ratio of the rollable display device 100. Therefore, by designing the support layer SUP in different parts of the substrate 102 and by designing the values ​​of the radius of curvature R1 of the curved portion BP and the radius of curvature R2 of the rollable portion RP, the support or flexibility of different parts of the substrate 102 can be improved, thereby improving the yield rate or user experience of the rollable display device 100.

[0038] like Figure 2 As shown, the rollable display device 100 may include, in addition to the aforementioned components and film layers, a first adhesive layer AD1, a second adhesive layer AD2, and a support plate PL, but is not limited thereto. The support plate PL may be disposed under the support layer SUP and may, for example, include a metal plate, which may include any suitable metal material, but is not limited thereto. The first adhesive layer AD1 and the second adhesive layer AD2 may include any suitable adhesive material, wherein the second adhesive layer AD2 is used to attach the support plate PL to the support layer SUP, and the first adhesive layer AD1 is used to attach the support layer SUP to the substrate 102, but is not limited thereto. In some embodiments, the support plate PL may be attached to the support layer SUP by other means (e.g., electrostatic attachment), and the second adhesive layer AD2 may be omitted. In some embodiments, the support layer SUP may be attached to the substrate 102 by other means (e.g., electrostatic attachment), and the first adhesive layer AD1 may be omitted.

[0039] It should be noted that the structure of the rollable display device 100 in this embodiment is not based on... Figure 1 and Figure 2 The invention is limited to what is shown. In some embodiments, the rollable display device 100 may also include other suitable elements and / or film layers, and the invention is not limited thereto. An embodiment of the manufacturing method of the rollable display device 100 of this invention will be described in detail below.

[0040] Please refer to Figures 3 to 8 , Figures 3 to 7 This is a schematic diagram illustrating the manufacture of the electronic device according to the first embodiment of the present invention. Figure 8 This is a manufacturing process diagram of an electronic device according to a first embodiment of the present invention. According to this embodiment, as... Figure 8 As shown, the manufacturing method 800 of the rollable display device 100 may include the following steps:

[0041] S802: Forming a substrate and display elements on a carrier plate, and then removing the carrier plate;

[0042] S804: Provides a support layer and defines tear lines on the support layer;

[0043] S806: A first adhesive layer is provided on the support layer, and the support layer is attached to the substrate through the first adhesive layer;

[0044] S808: A portion of the support layer is removed by tearing the line, and a support plate is installed under the support layer;

[0045] S810: Circuit elements and protective adhesive are provided on the bent portion of the substrate;

[0046] S812: Bend the curved portion of the substrate backward and fix it to the support plate with adhesive.

[0047] The following details each step of manufacturing method 800.

[0048] In this embodiment, the manufacturing method 800 of the rollable display device 100 can first perform step S802, forming a substrate 102 and a display element DE (such as...) on a carrier plate CR. Figure 3 (As shown), then remove the carrier board CR. Note that, as... Figure 3As shown, when forming a display element DE on substrate 102, some elements and / or film layers in the display element DE may not correspond to the curved portion BP of substrate 102, that is, they may not be provided on the curved portion BP, thereby improving the flexibility of the curved portion BP. For example, the cover layer CO, optical layer OP, touch layer TE, etc. of the display element DE may not cover the curved portion BP of substrate 102 or may not correspond to the curved portion BP, but this is not a limitation. Furthermore, the light-emitting unit LU and the driving unit DU may also not correspond to the curved portion BP, for example, the light-emitting unit LU may not be provided on the curved portion BP, and the driving unit DU may not be provided on at least a portion of the curved portion BP, but this is not a limitation. In addition, in this embodiment, the buffer layer BF corresponding to a portion of the curved portion BP may be removed and replaced with an organic material layer FL, but this is not a limitation. In detail, as Figure 3 As shown, the bent portion BP of the substrate 102 may include a portion P5, wherein the portion P5 can be defined, for example, as the part of the bent portion BP that is mainly bent or flexed, or the part of the bent portion BP with a greater degree of bending. According to this embodiment, the driving unit DU and the light-emitting unit LU may not be provided on the portion P5 of the bent portion BP, and the buffer layer BF, the first insulating layer IL1 and the second insulating layer IL2 corresponding to the portion P5 of the bent portion BP may be partially removed and filled with an organic material layer FL. The organic material layer FL may include any suitable organic insulating material, but is not limited thereto. The material of the organic material layer FL may have greater flexibility than the inorganic insulating material of the buffer layer BF. In this way, the flexibility of the portion P5 in the rollable display device 100 can be increased, thereby reducing the chance of the rollable display device 100 breaking when bent.

[0049] Next, step S804 is performed, providing a support layer SUP and defining a tear line TEL on the support layer SUP. Specifically, as follows... Figure 4 As shown, two tear lines (TEL) can be formed on the surface of the support layer (SUP), wherein the tear lines (TEL) are shown in... Figure 4 The lower part A2. Part A2 is a partial bottom view of the support layer SUP. The area between the two tear lines TEL can be defined as area AR1. According to this embodiment, the tear lines TEL on the support layer SUP can be formed, for example, by punching holes in the support layer SUP or by patterning the support layer SUP, but are not limited thereto. Furthermore, the two tear lines TEL on the support layer SUP can be formed, for example, corresponding to the portion P5 that is mainly bent or folded in the bent portion BP, or in other words, the area AR1 between the two tear lines TEL can substantially correspond to the area of ​​portion P5, but is not limited thereto.

[0050] Next, step S806 can be performed, in which a first adhesive layer AD1 is formed on the support layer SUP, and the support layer SUP is attached to the lower surface S1 of the substrate 102 through the first adhesive layer AD1, forming Figure 4 The structure is shown. According to some embodiments, the region AR1 between the two tear lines TEL on the support layer SUP may not have a first adhesive layer AD1, but this is not a limitation. That is, the portion P5 in the bent portion BP that is mainly bent or folded may not correspond to the first adhesive layer AD1.

[0051] Next, step S808 can be performed, where a portion of the support layer SUP is removed via the tear line TEL, and a support plate PL is installed beneath the support layer SUP. More specifically, as follows... Figure 5 As shown, after the substrate 102 and the display element DE are disposed on the support layer SUP, a portion of the support layer SUP corresponding to the area AR1 between the two tear lines TEL can be removed. Since the first adhesive layer AD1 may not correspond to the area AR1, a portion of the substrate 102 (or a portion of the bent portion BP) can be exposed after removing a portion of the support layer SUP, but this is not a limitation. Figure 5 As shown, after removing a portion of the support layer SUP, at least a portion of the bend BP may not correspond to the support layer SUP, or in other words, the support layer SUP may not be attached to at least a portion of the bend BP, but this is not a limitation. Generally, since the support layer SUP is not attached to all portions of the substrate 102, the support layer SUP can be divided into multiple portions, and multiple attachments are required to attach different portions of the support layer SUP to the substrate 102. However, since the position of the tear line TEL can be predefined on the support layer SUP in this embodiment, and the portion of the support layer SUP to be removed can be defined using the tear line TEL, only one attachment is required when attaching the support layer SUP to the substrate 102, thereby simplifying the process. Furthermore, compared to the case where the first adhesive layer AD1 is entirely disposed on the support layer SUP, since this embodiment can define the position on the support layer SUP excluding the first adhesive layer AD1 by means of the tear line TEL, after removing part of the support layer SUP, it is not necessary to perform an additional removal step of the first adhesive layer AD1, thereby reducing the chance of the substrate 102 being damaged during the removal step of the first adhesive layer AD1. According to this embodiment, the support plate PL may be provided corresponding to the non-rollable portion NRP and the rollable portion RP of the substrate 102, but not corresponding to the bent portion BP of the substrate 102, but is not limited thereto. The above design can improve the flexibility of the bent portion BP, while the support plate PL can provide support for the non-rollable portion NRP and the rollable portion RP. It should be noted that, although Figure 5 Not shown, the support plate PL can, for example, be via Figure 2 The second adhesive layer AD2, as shown, is attached to the support layer SUP. Furthermore, as... Figure 5 As shown, in this embodiment, the portion of the support plate PL corresponding to the rollable portion RP may include a groove RE, but is not limited thereto. In some embodiments, the groove RE may penetrate the support plate PL and expose a portion of the support layer SUP. In other embodiments, the groove RE may not penetrate the support plate PL. According to some embodiments, the order in which the steps of removing a portion of the support layer SUP and setting the support plate PL under the support layer SUP are performed is not limited to the above. In some embodiments, the support plate PL may be formed under the support layer SUP first, and then a portion of the support layer SUP may be removed.

[0052] Next, step S810 can be performed, where circuit elements CE and protective adhesive PG are formed on the bent portion BP of the substrate 102. Specifically, as follows... Figure 6As shown, the circuit element CE can be disposed corresponding to the bend portion BP, that is, the circuit element CE is disposed on the surface of the bend portion BP. The circuit element CE can be electrically connected to the display element DE or other elements of the rollable display device 100, for example, via wires or other suitable electronic components. The protective adhesive PG can at least cover a portion of the circuit element CE to provide protection for the circuit element CE, but is not limited thereto. In this embodiment, the protective adhesive PG can include any suitable adhesive material. The portion of the protective adhesive PG corresponding to the bend portion BP P5 can have a thickness T2, and the portion of the substrate 102 corresponding to the bend portion BP P5 can have a thickness T3. Specifically, the thickness T2 can be defined as the maximum thickness of the portion of the protective adhesive PG corresponding to the bend portion BP P5, and the thickness T3 can be defined as the maximum thickness of the portion of the substrate 102 corresponding to the bend portion BP P5, but is not limited thereto. According to this embodiment, the thickness T2 can be greater than the thickness T3, and the ratio of the thickness T2 to the thickness T3 can be in the range of 3 to 6 (i.e., 3 ≤ T2 / T3 ≤ 6), but is not limited thereto. In detail, when the ratio of thickness T2 to thickness T3 is less than 3, the protective adhesive PG may provide insufficient protection for the circuit element CE. When the ratio of thickness T2 to thickness T3 is greater than 6, the flexibility of the bending portion BP may decrease due to the increase in the thickness of the protective adhesive PG. In this embodiment, the overall thickness of the substrate 102 may be uniform, or the thickness of different portions of the substrate 102 may be approximately the same, but this is not a limitation. In some embodiments, the thickness of different portions of the substrate 102 may be different. According to this embodiment, the thickness range of the substrate 102 may be, for example, from 10 micrometers to 20 micrometers (i.e., 10 micrometers ≤ thickness of substrate 102 ≤ 20 micrometers), for example, 15 micrometers. That is, in this embodiment, the thickness T3 of the portion P5 of the substrate 102 corresponding to the bending portion BP may range from 10 micrometers to 20 micrometers (i.e., 10 micrometers ≤ thickness T3 ≤ 20 micrometers), but this is not a limitation. Therefore, according to this embodiment, since the ratio of thickness T2 to thickness T3 can range from 3 to 6, the thickness T2 of a portion of the protective adhesive PG corresponding to the bent portion BP can range from 30 micrometers to 120 micrometers (i.e., 30 micrometers ≤ thickness T2 ≤ 120 micrometers), for example, 75 micrometers, but is not limited thereto. It should be noted that the above ratio of thickness T2 to thickness T3 is merely exemplary, and the present invention is not limited thereto. In some embodiments, the ratio of thickness T2 to thickness T3 can be designed according to different product requirements.

[0053] Next, step S812 can be performed, in which the bent portion BP of the substrate 102 is bent backward, and the support layer SUP is fixed to the support plate PL by the adhesive layer GL, thereby forming Figure 7The structure. According to this embodiment, the adhesive layer GL may comprise any suitable adhesive material, and the invention is not limited thereto. For example... Figure 7 As shown, after the bent portion BP is bent and fixed to the back of the support plate PL by the adhesive layer GL, the thickness of a portion of the protective adhesive PG corresponding to the bent portion BP P5 is thickness T2', and the thickness of a portion of the substrate 102 corresponding to the bent portion BP P5 is thickness T3'. That is, the portion of the protective adhesive PG corresponding to the bent portion BP P5 in the bent state may have thickness T2', and the portion of the substrate 102 corresponding to the bent portion BP P5 in the bent state may have thickness T3'. According to this embodiment, the aforementioned thickness T2 may be the maximum thickness of the portion of the protective adhesive PG corresponding to the bent portion BP P5 in the unbent state, and the thickness T3 may be defined as the maximum thickness of a portion of the substrate 102 corresponding to the bent portion BP P5 in the unbent state, wherein thickness T2' may be approximately the same as thickness T2, and thickness T3' may be approximately the same as thickness T3, but is not limited thereto. That is, the ratio of thickness T2' to thickness T3' can be referred to above, and is between 3 and 6 (i.e., 3≤T2' / T3'≤6), but is not limited thereto. After performing step S812, the rollable display device 100 of this embodiment can be formed.

[0054] It should be noted that the manufacturing method 800 of the rollable display device 100 in this embodiment is not limited to the steps S802 to S812 described above, and may also include other suitable processes or steps. Furthermore, the order in which steps S802 to S812 in the manufacturing method 800 are performed is not limited to the above. In some embodiments, steps S802 to S812 may be performed in any suitable order according to process requirements.

[0055] Other embodiments of the present invention will be described in detail below. For the sake of simplicity, the same film or element will be referred to by the same designation in the following embodiments, and its features will not be repeated. The differences between the embodiments will be described in detail below.

[0056] Please refer to this again. Figure 1 In some embodiments, the ratio of the thickness T4 of the portion (second portion P6) of the rollable portion RP to which the support layer SUP is attached (or corresponds to) the substrate 102 can be designed to improve the performance of the rollable display device 100. Specifically, as... Figure 1As shown, a second portion P6 of the support layer SUP is attached to the rollable portion RP of the substrate 102. The second portion P6 may have a thickness T4, while the rollable portion RP may have a thickness T5. According to some embodiments, the ratio of the thickness T4 of the second portion P6 to the thickness T5 of the rollable portion RP may be in the range of 2 to 8 (i.e., 2 ≤ T4 / T5 ≤ 8). In this embodiment, the thicknesses of different portions of the substrate 102 may be approximately the same; therefore, the range of the thickness T5 of the rollable portion RP of the substrate 102 can be referenced to the thickness T3 described above. Please refer to... Figure 6 Thickness T3 is the thickness of the portion of substrate 102 corresponding to the bent portion BP, P5. For example, thickness T5 can range from 10 micrometers to 20 micrometers (i.e., 10 micrometers ≤ thickness T5 ≤ 20 micrometers), but is not limited thereto. Furthermore, the thickness of the support layer SUP corresponding to different portions of substrate 102 can be approximately the same, but is not limited thereto. Therefore, the range of thickness T4 of the support layer SUP corresponding to the rollable portion RP can refer to the thickness T1 described above. Thickness T1 is the thickness of the support layer SUP corresponding to the non-rollable portion NRP. For example, thickness T4 can range from 50 micrometers to 100 micrometers (i.e., 50 micrometers ≤ thickness T4 ≤ 100 micrometers), but is not limited thereto. However, in some other embodiments, the thickness of the support layer SUP corresponding to different portions of substrate 102 can be different. Appropriate design of the thicknesses T4 and T5 allows the support layer SUP to provide adequate support, preventing the display element DE on substrate 102 from breaking during the folding or unfolding of the rollable display device 100. Furthermore, the substrate can provide appropriate flexibility, which facilitates the unfolding and folding of the rollable display device 100. For example, when the thickness T4 of the support layer SUP corresponding to the rollable portion RP is 75 micrometers, the thickness T5 of the rollable portion RP of the substrate 102 can be, for example, 15 micrometers, and the ratio of thickness T4 to thickness T5 is 5, but not limited thereto. In some embodiments, the ratio of thickness T4 to thickness T5 can be designed according to different product requirements.

[0057] Please refer to Figure 9 , Figure 9 This is a cross-sectional schematic diagram of an electronic device according to a second embodiment of the present invention. It should be noted that, for the sake of simplicity, the accompanying drawings are... Figure 9 Only the support layer SUP, substrate 102, and roller SC of the rollable display device 100 are shown as examples. Other omitted components and / or film layers can be referred to the preceding text, and the same applies to the following embodiments, which will not be repeated here. Furthermore, although... Figure 9 The diagram illustrates only a single layer of the support layer SUP and the substrate 102, but the structures of the support layer SUP and the substrate 102 in this embodiment are not limited thereto. According to this embodiment, the substrate 102 may include a multi-layer structure. Specifically, as... Figure 9As shown in the partially enlarged schematic diagram of portion A3 of the lower substrate 102, the substrate 102 may, for example, be composed of a first organic layer OL1, a second organic layer OL2, and an inorganic layer IOL disposed between the first organic layer OL1 and the second organic layer OL2, but is not limited thereto. The first organic layer OL1 and the second organic layer OL2 may, for example, include any suitable organic insulating material, while the inorganic layer IOL may, for example, include an inorganic insulating material, such as silicon oxide, silicon nitride, or silicon oxynitride, but is not limited thereto. Furthermore, as... Figure 9 As shown, the first organic layer OL1 located on the lower side (or closer to the support layer SUP) of the substrate 102 may have a thickness T6, while the second organic layer OL2 located on the upper side (or farther from the support layer SUP) of the substrate 102 may have a thickness T7. In this embodiment, the thickness T6 of the first organic layer OL1 may be greater than the thickness T7 of the second organic layer OL2, but this is not a limitation. According to this embodiment, the ratio of thickness T7 to thickness T6 may range from, for example, greater than or equal to 0.5 and less than 1 (i.e., 0.5 ≤ T7 / T6 < 1), and the difference between thickness T6 and thickness T7 may range from, for example, from 0.1 micrometers to 6 micrometers (i.e., 0.1 micrometers ≤ T6 - T7 ≤ 6 micrometers), but this is not a limitation. In detail, according to some embodiments, the thickness T6 of the first organic layer OL1 is greater than the thickness T7 of the second organic layer OL2, which can improve the flatness of the inorganic layer IOL disposed on the first organic layer OL1, thereby improving the water and oxygen resistance of the substrate 102. As described above, the thickness of substrate 102 can range from, for example, 10 micrometers to 20 micrometers. Therefore, in this embodiment, the thicknesses of the first organic layer OL1, the second organic layer OL2, and the inorganic layer IOL of substrate 102 can be designed using the aforementioned features. For example, the thickness of substrate 102 is, for example, 15 micrometers, the thickness T6 of the first organic layer OL1 is, for example, 8 micrometers, the thickness T7 of the second organic layer OL2 is, for example, 5 micrometers, and the thickness of the inorganic layer IOL is, for example, 2 micrometers, but is not limited thereto.

[0058] Please refer to Figure 10 , Figure 10 This is a cross-sectional schematic diagram of an electronic device according to a third embodiment of the present invention. It should be noted that, for the sake of simplicity, the drawings are... Figure 10 Only the support layer SUP, substrate 102, roll scroll SC, and first adhesive layer AD1 for attaching the support layer SUP to the substrate 102 are shown as examples of the rollable display device 100; other components and / or film layers are omitted. Furthermore, although... Figure 10Only a single layer is schematically shown for the support layer SUP and the substrate 102, but the structures of the support layer SUP and the substrate 102 in this embodiment are not limited thereto. According to this embodiment, the support layer SUP attached to different parts of the substrate 102 may have different thicknesses, and a part of the support layer SUP attached to the non-curlable portion NRP of the substrate 102 may have a greater thickness than another part of the support layer SUP attached to the curable portion RP of the substrate 102, but not limited thereto. For example, as Figure 10 shown in the enlarged schematic view of the lower part A4, the thickness T1 of the first part P4 of the support layer SUP attached to the non-curlable portion NRP of the substrate 102 may be greater than the thickness T4 of the second part P6 of the support layer SUP attached to the curable portion RP of the substrate 102, but not limited thereto. According to some embodiments, the first part P4 and the second part P6 of the support layer may have the same thickness. In addition, according to this embodiment, the ratio range of the thickness T1 to the thickness T4 may be, for example, greater than 1 and less than or equal to 1.3 (i.e., 1 < T1 / T4 ≤ 1.3), and the difference between the thickness T1 and the thickness T4 may be, for example, from 0.5 micrometers to 2 micrometers (i.e., 0.5 micrometers ≤ T1 - T4 ≤ 2 micrometers), but not limited thereto. As described above, the range of the thickness T1 may be, for example, from 50 micrometers to 100 micrometers. Therefore, the range of the thickness T4 may be, for example, from 39 micrometers to 100 micrometers (39 micrometers ≤ thickness T8 ≤ 100 micrometers), but not limited thereto. For example, when the thickness T1 is 75 micrometers, the thickness T4 may be, for example, 74 micrometers, but not limited thereto. Since the thickness T4 of the support layer SUP attached to the curable portion RP of the substrate 102 in this embodiment is less than the thickness T1 of the support layer SUP attached to the non-curlable portion NRP of the substrate 102, the flexibility of the curable portion RP of the substrate 102 can be improved. According to this embodiment, the difference between the thickness T1 and the thickness T4 can be achieved, for example, by thinning the support layer SUP attached to the curable portion RP of the substrate 102. As Figure 10 shown, for example, by forming a groove RE1 on the support layer SUP attached to the curable portion RP of the substrate 102, the thickness T4 can be less than the thickness T1, but not limited thereto.

[0059] Furthermore, in some embodiments, the circuit element CE electrically connected to the display element DE in the rollable display device 100 can drive the display element DE corresponding to the non-rollable portion NRP and the display element DE corresponding to the rollable portion RP in sections, but this is not a limitation. Specifically, the display of a portion of the display element DE corresponding to the non-rollable portion NRP of the substrate 102 in the rollable display device 100 may not change with the degree of retraction and / or unfolding of the rollable display device 100, while the display of the display element DE corresponding to the rollable portion RP of the substrate 102 may change with the degree of retraction and / or unfolding of the rollable display device 100. Therefore, the circuit element CE can drive the display element DE corresponding to the non-rollable portion NRP and the display element DE corresponding to the rollable portion RP in sections, thereby switching different display modes under different stretching states. The above-described feature regarding the circuit element CE driving the display element DE corresponding to different portions of the substrate 102 in sections can be applied to various embodiments of the present invention, and therefore will not be repeated hereafter.

[0060] Please refer to Figure 11 , Figure 11 This is a cross-sectional schematic diagram of an electronic device according to a fourth embodiment of the present invention. It should be noted that, for the sake of simplicity, the accompanying drawings are... Figure 11 Only the support layer SUP, substrate 102, roll scroll SC, and first adhesive layer AD1 for attaching the support layer SUP to the substrate 102 are shown as examples of the rollable display device 100; other components and / or film layers are omitted. Furthermore, although... Figure 10 The diagram illustrates only a single layer of the support layer SUP and the substrate 102, but the structure of the support layer SUP and the substrate 102 in this embodiment is not limited thereto. According to this embodiment, the first adhesive layer AD1 corresponding to different portions of the substrate 102 may have different thicknesses, wherein the thickness of a portion of the first adhesive layer AD1 corresponding to the non-rollable portion NRP may be greater than the thickness of another portion of the first adhesive layer AD1 corresponding to the rollable portion RP, but this is not a limitation. In some embodiments, the thickness of the first adhesive layer AD1 may be substantially uniform, that is, the first adhesive layer AD1 corresponding to different portions of the substrate 102 may have substantially the same thickness. For example, such as... Figure 11As shown in the enlarged schematic view of the lower part A5, the first adhesive layer AD1 corresponding to the non-curling part NRP may, for example, have a thickness T9, while the first adhesive layer AD1 corresponding to the curling part RP may, for example, have a thickness T10, where the thickness T9 may be greater than the thickness T10, but not limited thereto. In addition, according to this embodiment, the ratio range of the thickness T9 to the thickness T10 may, for example, be greater than 1 and less than or equal to 1.3 (i.e., 1 < T9 / T10 ≤ 1.3), and the difference between the thickness T9 and the thickness T10 may, for example, range from 0.5 micrometers to 5 micrometers (i.e., 0.5 micrometers ≤ T9 - T10 ≤ 5 micrometers), but not limited thereto. According to this embodiment, the range of the thickness T9 of the first adhesive layer AD1 corresponding to the non-curling part NRP may, for example, range from 50 micrometers to 100 micrometers (i.e., 50 micrometers ≤ T9 ≤ 100 micrometers). Therefore, the range of the thickness T10 may, for example, be 39 micrometers to 100 micrometers (39 micrometers ≤ thickness T10 ≤ 100 micrometers), but not limited thereto. For example, when the thickness T9 is 70 micrometers, the thickness T10 may, for example, be 68 micrometers, but not limited thereto. Since the thickness T10 of the first adhesive layer AD1 corresponding to the curling part RP in this embodiment is less than the thickness T9 of the first adhesive layer AD1 corresponding to the non-curling part NRP, the flexibility of the curling part RP of the substrate 102 can be improved. The difference between the thickness T9 and the thickness T10 in this embodiment can be achieved, for example, by thinning the first adhesive layer AD1 corresponding to the curling part RP. Specifically, as Figure 11 shown, for example, by forming a groove RE2 on the first adhesive layer AD1 corresponding to the curling part RP, the thickness T10 can be less than the thickness T9, but not limited thereto.

[0061] Please refer to Figure 12 , Figure 12 is a top view schematic diagram of the substrate of the electronic device according to the fifth embodiment of the present invention. According to this embodiment, different parts of the substrate 102 may have different widths, where the width of the bending part BP may, for example, be less than the width of the curling part RP, but not limited thereto. Specifically, as Figure 12As shown, the minimum width of the rollable portion RP of the substrate 102 in the second direction DR2 is the width W1, and the minimum width of the bending portion BP of the substrate 102 in the second direction DR2 is the width W2, where the width W1 may be greater than the width W2. The above-mentioned second direction DR2 may be, for example, perpendicular to the unfolding-folding direction SD of the rollable display device 100, but is not limited thereto. Since the width W2 of the bending portion BP is smaller than the width W1 of the rollable portion RP in this embodiment, the flexibility of the bending portion BP can be improved, so that the bending portion BP can be more easily bent to the back surface of the rollable display device 100, thereby achieving the effect of a narrow border of the rollable display device 100. In addition, in this embodiment, the ratio range of the width W2 to the width W1 may be, for example, between 0.5 and 1 (i.e., 0.5 < W2 / W1 < 1), but is not limited thereto. When the ratio of the width W2 to the width W1 is less than 0.5, the density of the traces for electrically connecting the circuit element CE and the electronic component (such as the display element DE) of the rollable display device 100 will be increased, and the chance of abnormal conditions occurring in the bending portion BP may increase. When the ratio of the width W2 to the width W1 is greater than 1, the flexibility of the bending portion BP may be reduced. In this embodiment, as Figure 12 shown, the width of the non-rollable portion NRP of the substrate 102 may be, for example, the same as that of the rollable portion RP, but is not limited thereto. In some embodiments, the width of the non-rollable portion NRP may be different from the width of the rollable portion RP.

[0062] In summary, the present invention provides a rollable display device, wherein the substrate of the rollable display device may include a bending portion, a rollable portion, and a non-rollable portion. Since the support layer of the rollable display device may have different designs according to different parts of the substrate, the supportability or flexibility of different parts of the substrate can be improved, thereby improving the qualification rate or user experience of the display device. In addition, the thickness of each film layer in the rollable display device of the present invention can be designed to further improve the flexibility of the display device.

[0063] The above are only the embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rollable display device, characterized in that, include: A substrate having a bending portion, a rollable portion and a non-rollable portion; A display element is disposed on the rollable portion; A circuit element is disposed on the bent portion and electrically connected to the display element; A support layer is disposed under the substrate, wherein the support layer is attached to the rollable portion and is not attached to at least a portion of the curved portion; as well as An adhesive layer is bonded between the substrate and the support layer. The adhesive layer includes: A first part, the rollable portion adhered to the substrate; and A second part, adhered to the non-rollable portion of the substrate, wherein the thickness of the first part is less than the thickness of the second part. The support layer includes: A third part, the rollable portion adhered to the substrate; and A fourth part, which is adhered to the non-rollable portion of the substrate, wherein the thickness of the third part is less than the thickness of the fourth part. Wherein, in a first direction perpendicular to the surface of the non-rollable portion, the curved portion and the non-rollable portion at least partially overlap.

2. The rollable display device as claimed in claim 1, characterized in that, The curvature of the curved portion is greater than the curvature of the rollable portion.

3. The rollable display device as described in claim 1, characterized in that, The non-curlable portion is disposed between the curved portion and the curable portion.

4. The rollable display device as claimed in claim 1, characterized in that, The radius of curvature of the curved portion is less than 20 times the thickness of the fourth portion.

5. The rollable display device as claimed in claim 1, characterized in that, The ratio of the thickness of the third part to the thickness of the rollable part is in the range of 2 to 8.

6. The rollable display device as claimed in claim 1, characterized in that, The substrate includes a first organic layer, a second organic layer disposed on the first organic layer, and an inorganic layer disposed between the first organic layer and the second organic layer.

7. The rollable display device as claimed in claim 6, characterized in that, In the rollable portion, the thickness of the first organic layer is greater than the thickness of the second organic layer.

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