Foldable electronic device

Abstract

The invention discloses a foldable electronic device which is provided with a first area, a second area and a foldable area connected with the first area and the second area. The foldable electronic device comprises a flexible substrate, a plurality of first electronic units arranged on the flexible substrate and located in the first area, and a plurality of second electronic units arranged on the flexible substrate and located in the foldable area. The flexible substrate is provided with a first protrusion located in the first area, a second protrusion located in the foldable area and a first groove formed between the first protrusion and the second protrusion, and the width of the first protrusion is larger than that of the second protrusion.

Description

[0001] This application is a divisional application of the invention patent application with application date of December 27, 2019, application number 202210813850.8, and invention name “Foldable display device” (its original parent application number is 201911376008.7, and invention name is “Foldable display device”). Technical Field

[0002] The invention relates to an electronic device, in particular to a foldable electronic device. Background Art

[0003] In recent years, foldable electronic devices have become one of the focuses of the next era of electronic technology. Foldable electronic devices are easy to carry when folded, and can be extended to a larger size to display images when unfolded. Therefore, foldable electronic devices can have many different applications as electronic displays, such as televisions, monitors, mobile computing devices (such as smart phones, tablets, mobile personal computers), e-books, and wearable devices (such as smart watches). In addition, light-emitting elements have been used in display devices to provide light sources or display images. However, when light-emitting elements are set in the bending part of the foldable display device, defects may easily occur. Therefore, how manufacturers can improve the pass rate of foldable display devices with light-emitting elements has become an important issue. Summary of the invention

[0004] One object of the present invention is to provide a foldable display device and a related electronic device, wherein the foldable display device comprises a light-emitting unit for displaying an image. Another object of the present invention is to provide an electronic device comprising a foldable area connected to a flat area.

[0005] One embodiment of the present invention provides a foldable electronic device, which includes a first area, a second area, and a foldable area connecting the first area and the second area. The foldable electronic device includes a flexible substrate; a plurality of first electronic units are arranged on the flexible substrate and located in the first area; and a plurality of second electronic units are arranged on the flexible substrate and located in the foldable area. The flexible substrate has a first protrusion located in the first area, a second protrusion located in the foldable area, and a first groove arranged between the first protrusion and the second protrusion, and the width of the first protrusion is greater than the width of the second protrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 FIG. 1 is a schematic top view of an electronic device or a foldable display device according to a first embodiment of the present invention.

[0007] Figure 2 In the present invention, Figure 1 A cross-sectional schematic diagram of an electronic device or a foldable display device is shown.

[0008] Figure 3 In the present invention, Figure 1 A schematic cross-sectional view of detailed components of an electronic device or a foldable display device is shown.

[0009] Figure 4 FIG. 4 is a cross-sectional schematic diagram of an electronic device or a foldable display device according to a second embodiment of the present invention.

[0010] Figure 5 FIG. 4 is a cross-sectional schematic diagram of an electronic device or a foldable display device according to a third embodiment of the present invention.

[0011] Figure 6 FIG. 4 is a cross-sectional schematic diagram of an electronic device or a foldable display device according to a fourth embodiment of the present invention.

[0012] Figure 7 It is a top view schematic diagram of an electronic device or a foldable display device according to a variation of the fourth embodiment of the present invention.

[0013] Figure 8 FIG. 5 is a cross-sectional schematic diagram of an electronic device or a foldable display device according to a fifth embodiment of the present invention.

[0014] Fig. 9 FIG. 4 is a cross-sectional schematic diagram of an electronic device or a foldable display device according to a sixth embodiment of the present invention.

[0015] Fig.10 FIG. 4 is a cross-sectional schematic diagram of an electronic device or a foldable display device according to a seventh embodiment of the present invention.

[0016] Fig.11 FIG. 4 is a cross-sectional schematic diagram of an electronic device or a foldable display device according to an eighth embodiment of the present invention.

[0017] Fig.12 FIG. 4 is a top view of an electronic device or a foldable display device according to a ninth embodiment of the present invention.

[0018] Fig.13 FIG. 1 is a top view of an electronic device or a foldable display device according to a tenth embodiment of the present invention.

[0019] Fig.14 FIG. 1 is a cross-sectional schematic diagram of an electronic device or a foldable display device according to an eleventh embodiment of the present invention.

[0020] Fig.15 It is a cross-sectional schematic diagram of an electronic device or a foldable display device according to a twelfth embodiment of the present invention.

[0021] Fig.16It is a top view schematic diagram of an electronic device or a foldable display device according to a thirteenth embodiment of the present invention.

[0022] Fig.17 for Fig.16 The light emitting unit and the circuit layer are enlarged cross-sectional views along the cut lines AA' and BB'.

[0023] Fig.18 FIG. 1 is an enlarged top view of a pixel in the foldable display device according to the fourteenth embodiment of the present invention.

[0024] Fig.19 It is a top view schematic diagram of an electronic device or the foldable display device according to a fifteenth embodiment of the present invention.

[0025] Explanation of reference numerals: 32-first pixel region; 34-second pixel region; 51-first electronic unit; 52-second electronic unit; 100-foldable display device; 102-section line, precise section line; 1021, 1022, 1023, 1024-tolerance section line; 110-circuit layer; 112-recess; 114-covering layer; 116-first electrode; 118-second electrode; 120-first semiconductor layer; 122-light-emitting layer; 124-second semiconductor layer; 126, 128-bonding material; 1261-first bonding material; 1262-second bonding material; 130, 134-bonding pad; 130'-spare bonding pad; 1301, 327-first bonding pad; 1302, 347-second bonding pad; 132-common electrode; 136-self-reflective layer; 138, 1381, 1382-groove; 138s-sidewall; 138c-connecting part; 140-anisotropic conductive film; 142-conductive particles; 1421-first conductive particles; 150-filter layer; 1521, 1522-light conversion element; 1523-filling body; 154-thin film transistor; 325-first part; 345-second part; A-A', B-B'-cut line; B1-first dividing line; B2-second dividing line; BML-black matrix layer; BM1-first black matrix part; BM2-second black matrix part; BM21-first black matrix layer; BM22-second black matrix layer; D 1, D2, D3-direction; d1, d2-distance; DE-drain; dt1, dt2-tolerance difference; ED-electronic device, foldable electronic device; FX-folding axis; GC-geometric center; GE-gate; h1, h2, H5, H6-height; H1, H2, H3, H4-thickness; IN-insulating layer; L1, L3-area; L2, L4-maximum area; LE1-first light-emitting unit; LE2-second light-emitting unit; LEP1, LEP2-light-emitting group; LEP2-second light-emitting group; LN1, LN2, LN3-row; NP-neutral plane; OPN-opening; OS-outer surface; P1-first surface portion; P2-second surface portion; P3-third surface portion; PCR- Predetermined bonding area; PCR'-reserve bonding area; PLN1, PLN2-plane; PT1-first protective member; PT2-second protective member; PX-pixel; QD11, QD12-first light conversion element; QD21, QD22-second light conversion element; R1-first area, first display area; R2-second area, second display area; Ra1-first ratio; Ra2-second ratio; RF-foldable area, foldable display area; SC-semiconductor layer; SE-source; SUB-flexible substrate; SUB1-bottom surface; SUB11, SUB12-protrusion; U11, U12, U13, U21, U22, U23-sub-pixel unit; WL1, WL2-width;Wp1, Wp2, WQ1, WQ2-area; α-angle; β, θ-included angle; θ1, θ2-rotation angle. ; DETAILED DESCRIPTION

[0026] The present invention can be understood by referring to the following detailed description in conjunction with the accompanying drawings. It should be noted that in order to facilitate the reader's understanding and the simplicity of the drawings, the multiple drawings in the present invention only depict a portion of the display device / electronic device, and the specific elements in the drawings are not drawn according to the actual scale. In addition, the number and size of each element in the drawings are only for illustration and are not intended to limit the scope of the present invention.

[0027] Certain words are used throughout the specification and claims to refer to specific components. It should be understood by those skilled in the art that electronic equipment manufacturers may refer to the same components by different names. It is not intended to distinguish between components that have the same function but different names. In the following specification and claims, the words "including" and "comprising" are open-ended words and should be interpreted as "including but not limited to...".

[0028] It should be understood that when an element or film layer is referred to as being "on" or "connected to" another element or film layer, it may be directly on or directly connected to the other element or layer, or there may be an intervening element or film layer between the two. Conversely, when an element is referred to as being "directly" "on" or "directly connected to" another element or film layer, there may be no intervening element or film layer between the two.

[0029] It should be understood that the features of several different embodiments may be replaced, reorganized, or mixed to complete other embodiments without departing from the spirit of the present invention.

[0030] Please refer to Figures 1 to 3 , Figure 1 is a top view schematic diagram of an electronic device or a foldable display device according to a first embodiment of the present invention, Figure 2 for Figure 1 The cross-sectional schematic diagram of the electronic device or the foldable display device shown, Figure 3 In the present invention, Figure 1 The schematic cross-sectional view of the detailed components of the electronic device or foldable display device shown in FIG. Figure 2 The electronic device is shown in a folded state. Figure 1 and Figure 2 As shown, the electronic device ED of the present invention can be a foldable electronic device, which can be folded along a folding axis FX and at a folding angle between 180° and -180°. For example, Figure 2The foldable electronic device ED shown is in an inwardly folded state, and the folding angle is 180°. The foldable electronic device ED includes a first area R1, a second area R2, and a foldable area RF connecting the first area R1 and the second area R2. In some embodiments, the first area R1 and the second area R2 are flat, or compared to the foldable area RF, the first area R1 and the second area R2 are flatter. The foldable area RF of the foldable electronic device ED can be curved, bent, and / or folded, that is, it can exist as a curved surface. In some embodiments, the foldable electronic device ED may include more than one foldable area RF. Figure 1 and Figure 2 As shown, the foldable electronic device ED of the present invention may include a flexible substrate SUB, a plurality of first electronic units 51 disposed on the flexible substrate SUB and located in the first region R1 and / or the second region R2, and a plurality of second electronic units 52 disposed on the flexible substrate SUB and located in the foldable region RF. In some embodiments, the first electronic unit 51 and the second electronic unit 52 may have a display function. For example, the first electronic unit 51 may include a plurality of first light-emitting units LE1 disposed in the first region R1 and / or the second region R2, and the second electronic unit 52 may include a plurality of second light-emitting units LE2 disposed in the foldable region RF. Under this design, the first region R1, the second region R2, and the foldable region RF may have a display function, so the above three regions may also be respectively referred to as the first display region R1, the second display region R2, and the foldable display region RF in some embodiments. The light-emitting units may be arranged in a matrix, for example, configured into a plurality of rows arranged along a direction D1 and a plurality of columns arranged along a direction D2. The direction D1 and the direction D2 may be different, for example, the two directions may be perpendicular to each other. However, the arrangement of the light emitting units is not limited thereto.

[0031] According to some embodiments, the first electronic unit 51 and the second electronic unit 52 may not have a display function. For example, the electronic unit may be an antenna unit, such as a liquid crystal antenna unit, and the liquid crystal antenna unit may transmit or receive electromagnetic waves.

[0032] According to some embodiments, the foldable electronic device ED may be a foldable display device 100. The foldable electronic device ED has an outer surface OS, and the outer surface OS includes a first surface portion P1, a second surface portion P2, and a third surface portion P3, wherein the first surface portion P1 is used to define a first display area R1, the second surface portion P2 is used to define a second display area R2, and the third surface portion P3 is used to define a foldable display area RF. When the foldable electronic device ED is unfolded to an unfolded state (or unfolded state), the first surface portion P1, the second surface portion P2, and the third surface portion P3 are located in the same plane. When the foldable electronic device ED is folded to Figure 2 In a folded state shown, the first surface portion P1 is flat and is in the same plane as a plane PLN1, the second surface portion P2 is flat and is in the same plane as another plane PLN2, and the third surface portion P3 is bent and is not in the same plane as the above planes. It can be seen that when the foldable electronic device ED is in a folded state, the third surface portion P3 can be defined as between the plane PLN1 and the plane PLN2. In detail, the position leaving from the first surface portion P1 is defined as a first dividing line B1, and the position leaving from the second surface portion P2 is defined as a second dividing line B2. In other words, the foldable area RF can be defined as an area between the first dividing line B1 and the second dividing line B2.

[0033] To simplify the description, the following embodiments use the foldable display device 100 as an example of the foldable electronic device ED. Figure 3 As shown, the foldable display device 100 includes a plurality of first light-emitting units LE1 disposed on a flexible substrate SUB and located in a first display region R1 and a second display region R2, a plurality of second light-emitting units LE2 disposed on a flexible substrate SUB and located in a foldable display region RF, a first protective member PT1 for protecting at least one of the plurality of first light-emitting units LE1, and a second protective member PT2 for protecting at least one of the plurality of second light-emitting units LE2. In addition, a circuit layer 110 may also be disposed on the flexible substrate SUB. The circuit layer 110 may include wires and / or driving units (such as transistors), but Figure 3 The circuit layer 110 is drawn as a single layer for illustration. The detailed structure of the circuit layer 110 will be described in detail in the following embodiments. The circuit layer 110 may include a plurality of recesses 112 for disposing the first light emitting unit LE1 and the second light emitting unit LE2. The first protective member PT1 may cover and fill the recesses 112 in which the first light emitting unit LE1 is disposed, and the second protective member PT2 may cover and fill the recesses 112 in which the second light emitting unit LE2 is disposed. In addition, a covering layer 114 may be disposed on the first protective member PT1 and the second protective member PT2.

[0034] In some embodiments, the first light emitting unit LE1 and the second light emitting unit LE2 may be one of an organic light emitting diode (OLED), an inorganic light emitting diode (LED), or a quantum dot light emitting diode. The inorganic light emitting diode may be a sub-millimeter light emitting diode (mini-LED) or a micro-light emitting diode (micro-LED). In some embodiments, the size of the sub-millimeter light emitting diode may range from 100 micrometers to 300 micrometers. In some embodiments, the size of the micro-light emitting diode may range from 1 micrometer to 100 micrometers. The first light emitting unit LE1 and the second light emitting unit LE2 may be a flip chip-type structure or a vertical type structure. Taking the first light emitting unit LE1 as an example, the first light emitting unit LE1 may include a first electrode 116, a second electrode 118, a first semiconductor layer 120, a light emitting layer 122, and a second semiconductor layer 124. For example, the light emitting layer 122 may be a multiple quantum well (MQW) layer, but is not limited thereto. The first light emitting unit LE1 is electrically connected to the circuit layer 110 via the first bonding materials 126 and 128. In detail, the circuit layer 110 may include a plurality of bonding pads 130 and a plurality of bonding pads 134. Taking a first light emitting unit LE1 as an example, the first electrode 116 of the first light emitting unit LE1 may be electrically connected to one of the bonding pads 130 via the first bonding material 126, and the second electrode 118 of the first light emitting unit LE1 may be electrically connected to the bonding pad 134 via the first bonding material 128. The connection between the second light emitting unit LE2 and the circuit layer 110 is similar to the connection between the first light emitting unit LE1 and the circuit layer 110 described above, so it is not repeated here. When the circuit layer 110 includes a driving unit for driving the light emitting unit, the foldable display device 100 may be an active display device. The foldable display device 100 may be a passive display device, and the first light emitting unit LE1 and the second light emitting unit LE2 may not be directly connected to the driving unit.

[0035] like Figure 3 As shown, in some embodiments, the first light emitting unit LE1 located in the first display area R1 and the second display area R2 is covered by the first protective member PT1, and the second light emitting unit LE2 located in the foldable display area RF is covered by the second protective member PT2, but it is not limited thereto. The first protective member PT1 has a thickness H1, and the second protective member PT2 has a thickness H2. Please refer to Figure 1 and Figure 3 The thickness of the protective element can be defined by referring to Figure 1The enlarged view of the first light-emitting unit LE1 below. For example, the thickness H1 of the first protective member PT1 can be determined by the following steps: (1) selecting a first light-emitting unit LE1; (2) determining the geometric center GC of the selected first light-emitting unit LE1; (3) cutting a cutting section (as shown by the section line 102) through the geometric center GC to obtain a cross-sectional profile; and (4) measuring from the bottom surface to the top surface of the first protective member PT1 in the cross-sectional profile, and taking the maximum thickness measured as the thickness of the first protective member PT1. In some embodiments, five different first light-emitting units LE1 can be selected to perform steps (1) to (4) respectively to obtain their average value as the thickness H1 of the first protective member PT1 corresponding to the first light-emitting unit LE1. In addition, the above cross-sectional profile can also be used to measure the thickness H3 of the flexible substrate SUB in the first display area R1, wherein the thickness H3 corresponds to the thickness H1 of the first protective member PT1. For example, the cutting section (i.e., the section line 102) can be perpendicular to the folding axis FX. The cut profile may have a small allowable displacement or error. For example, the allowable tolerance difference of the cut profile may be less than ±5 microns, such as Figure 1 As shown in part (A) of FIG. 1 , the tolerance difference between the tolerance profile lines 1021 and 1022 and the precision profile line 102 is represented by symbols dt1 and dt2. In addition, the allowable tolerance of the rotation angle of the cut profile can be less than 3°-5°, such as Figure 1 As shown in part (B), the rotation angle tolerance is represented by the rotation angles θ1 and θ2 of the tolerance profile lines 1023 and 1024. The thickness H2 of the second protection member PT2 corresponding to the second light emitting unit LE2 and the corresponding thickness H4 of the flexible substrate SUB in the foldable display region RF are measured in a manner similar to the thickness H1 and the thickness H3, so they are not repeated here.

[0036] In the first display region R1, the ratio of the thickness H1 of the first protection member PT1 to the thickness H3 of the flexible substrate SUB is defined as a first ratio Ra1 (i.e., Ra1=H1 / H3). In the foldable display region RF, the ratio of the thickness H2 of the second protection member PT2 to the thickness H4 of the flexible substrate SUB is defined as a second ratio Ra2 (i.e., Ra2=H2 / H4). Figure 3As shown, by designing the second ratio Ra2 and the first ratio Ra1 to be unequal values, the position of the neutral plane (NP) of the foldable display device 100 can be adjusted. For example, in some embodiments, the second ratio Ra2 can be designed to be greater than the first ratio Ra1 (i.e., Ra2 > Ra1), so that the neutral plane NP located in the foldable display region RF is closer to the interface between the second light-emitting unit LE2 and the bonding pads 130, 134. Therefore, when the foldable display device 100 is in a folded state, the second light-emitting unit LE2 can have better adhesion performance or reliability. The above-mentioned neutral plane NP refers to a plane formed by the minimum stress points of the foldable display device 100 in the direction D3, where the direction D3 is perpendicular to the surface of the flexible substrate SUB.

[0037] In some embodiments, the thickness H2 of the second protective member PT2 can be greater than the thickness H1 of the first protective member PT1, and the corresponding thickness H3 of the flexible substrate SUB in the first display region R1 or the second display region R2 can be substantially equal to the corresponding thickness H4 of the flexible substrate SUB in the foldable display region RF (i.e., H2 > H1 and H4 = H3), whereby the second ratio Ra2 is greater than the first ratio Ra1 (as Figure 3 shown). In some embodiments, the thickness H2 of the second protective member PT2 can be greater than or equal to the thickness H1 of the first protective member PT1, and the thickness H3 of the flexible substrate SUB can be greater than the thickness H4 of the flexible substrate SUB, so that the second ratio Ra2 can still be greater than the first ratio Ra1 (i.e., H2 ≥ H1 and H4 < H3). For example, the range of the thickness H2 can be from about 5 micrometers to about 15 micrometers; the range of the thickness H4 can be from about 10 micrometers to about 100 micrometers; the range of the thickness H1 can be from about 3 micrometers to about 10 micrometers; the range of the thickness H3 can be from about 10 micrometers to about 120 micrometers, but is not limited thereto.

[0038] In some embodiments, the first ratio Ra1 and the second ratio Ra2 can satisfy at least one of the following mathematical formulas:

[0039] 0.1 ≤ Ra2 ≤ 1.5;

[0040] 0.02 ≤ Ra1 < 0.1; and

[0041] 0.005 ≤ Ra2 - Ra1 ≤ 1.5.

[0042] If the value of the first ratio Ra1 or the second ratio Ra2 is too large, the flexible substrate SUB may lack sufficient support capacity to support the light-emitting unit. If the value of the first ratio Ra1 or the second ratio Ra2 is too small, the first protective member PT1 or the second protective member PT2 may not provide sufficient protection to the corresponding light-emitting unit when the foldable display device 100 is folded. Therefore, according to some embodiments, the first ratio Ra1 and the second ratio Ra2 can be designed to be suitable values ​​to reduce the probability of damage or peeling of the light-emitting unit in the folded state, thereby affecting the qualified rate of the foldable display device 100. Therefore, when the first ratio Ra1 and the second ratio Ra2 are maintained within a suitable range, such as the above-mentioned values, the reliability of the foldable display device 100 can be increased. Reliability, crack possibility or damage status can be obtained through a bending test. For example, the above-mentioned bending test can be, for example, the foldable display device 100 can be bent 100,000 times (the present invention is not limited to this number) and observed with an optical microscope (OM). The above-mentioned design of making the first ratio Ra1 smaller than the second ratio Ra2 can be applied to any other embodiment or variant embodiment of the present invention, that is, the electronic device and / or foldable display device in the following embodiments and variant embodiments of the present invention can have a design in which the first ratio Ra1 is smaller than the second ratio Ra2, which will not be repeated later.

[0043] In some embodiments, the first protective member PT1 and the second protective member PT2 may include the same material. Alternatively, in a variant embodiment, the material of the first protective member PT1 may not be completely the same as the material of the second protective member PT2. For example, the Young's modulus of the second protective member PT2 may be less than the Young's modulus of the first protective member PT1. The first protective member PT1 may have a greater rigidity and / or elastic recovery force. The second protective member PT2 with a lower Young's modulus may provide better ductility to reduce the possibility of the second protective member PT2 breaking when the foldable display device 100 is bent. The first protective member PT1 may include an organic material, and the organic material may be selected from at least one of an acryl-based resin and an epoxy resin. The Young's modulus of the first protective member PT1 may range from about 2 GPa to about 20 GPa. The second protective member PT2 may be composed of an organic material including a silicon-based resin. The Young's modulus of the organic material of the second protective member PT2 may range from about 0.001 GPa to about 0.05 GPa.

[0044] The electronic device and foldable display device of the present invention are not limited to the above-mentioned embodiments, and may include other different embodiments and variant embodiments. To simplify the description, the same elements in the following embodiments are represented by the same symbols. In order to more conveniently compare the differences between the embodiments and the variant embodiments, the differences between the different embodiments and the variant embodiments will be described in detail below, and the same parts will not be repeated.

[0045] Please refer to Figure 4 . Figure 4 Schematic cross-sectional view of an electronic device or a foldable display device according to a second embodiment of the present invention. In the second embodiment, the first light emitting unit LE1 and the second light emitting unit LE2 may be vertical light emitting diodes as an example. Similarly, the first light emitting unit LE1 and the second light emitting unit LE2 may include sub-millimeter light emitting diodes and / or micrometer light emitting diodes. The second electrode 118 of the first light emitting unit LE1 or the second light emitting unit LE2 may be electrically connected to a common electrode 132 that extends laterally and covers the first light emitting unit LE1, the second light emitting unit LE2 and the circuit layer 110. In other words, the common electrode 132 electrically connected to the second electrodes 118 of different first light emitting units LE1 and second light emitting units LE2 may be connected to each other. In some embodiments, the thickness H1 of the first protective member PT1 covering the first light emitting unit LE1 may be substantially equal to the thickness H2 of the second protective member PT2 covering the second light emitting unit LE2. However, the thickness H4 of the flexible substrate SUB in the foldable display region RF is less than the thickness H3 of the flexible substrate SUB in the first display region R1 or the second display region R2. In detail, the flexible substrate SUB may have at least one groove 138 in the foldable display region RF, so the thickness H4 corresponding to the groove 138 is thinner. In some embodiments, the sidewall 138s of the groove 138 is approximately perpendicular to the surface of the flexible substrate SUB or parallel to the direction D3, but the present invention is not limited thereto. In the design of the flexible substrate SUB having the groove 138, the second ratio Ra2 of the thickness H2 to the thickness H4 may be greater than the first ratio Ra1 of the thickness H1 to the thickness H3.

[0046] On the other hand, one of the first light-emitting units LE1 is electrically connected to the circuit layer 110 via a first bonding material 1261, and one of the second light-emitting units LE2 is electrically connected to the circuit layer 110 via a second bonding material 1262, and the first bonding material 1261 and the second bonding material 1262 may have different areas. For example, the area of ​​the first bonding material 1261 may be smaller than the area of ​​the second bonding material 1262, but the present invention is not limited thereto. Figure 4As shown, the first bonding material 1261 may have an area L1, which is used to represent the contact area between the first bonding material 1261 and the first electrode 116 of the first light-emitting unit LE1, and the first bonding material 1261 may have a maximum area L2, which corresponds to the projection area of ​​the first bonding material 1261 on the surface of the flexible substrate SUB. The second bonding material 1262 may have an area L3, which is used to represent the contact area between the second bonding material 1262 and the first electrode 116 of the second light-emitting unit LE2, and the second bonding material 1262 may have a maximum area L4, which corresponds to the projection area of ​​the second bonding material 1262 on the surface of the flexible substrate SUB. The area L3 is greater than the area L1, and the area L4 is greater than the area L2. Under this design, the total amount of the second bonding material 1262 corresponding to one of the second light-emitting units LE2 may be greater than the total amount of the first bonding material 1261 corresponding to one of the first light-emitting units LE1. Therefore, the bonding area of ​​the second bonding material 1262 may be greater than the bonding area of ​​the first bonding material 1261. When the foldable display device 100 is in a folded state, the second bonding material 1262 has a larger bonding area, which can provide a stronger bonding performance for the bonding between the second light-emitting unit LE2 and the bonding pad 130, so as to reduce the possibility of peeling or damage. In addition, the foldable display device 100 may also include a self-reflective layer 136. The self-reflective layer 136 can be arranged on the side wall of the first light-emitting unit LE1 and / or the side wall of the second light-emitting unit LE2. The self-reflective layer 136 can prevent the light generated by the light-emitting unit from diverging laterally, so that most of the light is emitted vertically by the light-emitting unit, thereby avoiding crosstalk and / or color mixing. The setting of the self-reflective layer 136 can be applied to other embodiments or variant embodiments of the present invention, that is, although it is not specifically mentioned in other embodiments, variant embodiments or figures, the side walls of the light-emitting units in other embodiments or variant embodiments of the present invention can be provided with the self-reflective layer 136, which will not be repeated.

[0047] Please refer to Figure 5 . Figure 5It is a cross-sectional schematic diagram of an electronic device or a foldable display device according to the third embodiment of the present invention. In the third embodiment, the first protective member PT1 and the second protective member PT2 may be continuous layers that extend laterally and cover the first light-emitting unit LE1 or the second light-emitting unit LE2, respectively. The first protective member PT1 and the second protective member PT2 may include completely identical or non-completely identical materials. There may be an obvious or unclear boundary between the first protective member PT1 and the second protective member PT2. In some embodiments, the second protective member PT2 may be composed of a material that is not completely identical to the first protective member PT1, and the second protective member PT2 may overlap the foldable display area RF, and overlap part of the first display area R1 and / or part of the second display area R2 near the foldable display area RF. In the third embodiment, the side wall 138s of the groove 138 of the flexible substrate SUB may be inclined relative to the direction D3. For example, if Figure 5 As shown, the side wall 138s and the bottom surface SUB1 of the flexible substrate SUB may form an angle β, and the angle β is an obtuse angle. In addition, in some embodiments, the bonding material used to electrically connect the first light emitting unit LE1 and the second light emitting unit LE2 to the circuit layer 110 may include an anisotropic conductive film (ACF) 140. Figure 5 As shown, the anisotropic conductive film 140 is disposed between the first protective member PT1, the second protective member PT2, the first light-emitting unit LE1, the second light-emitting unit LE2 and the bonding pads 130, 134 of the circuit layer 110, and is disposed on the flexible substrate SUB. The anisotropic conductive film 140 may include a plurality of conductive particles 142. When the first light-emitting unit LE1 and the second light-emitting unit LE2 are bonded to the circuit layer 110, the light-emitting unit is pressed downward and squeezes the conductive particles 142 thereunder, thereby enabling the compressed conductive particles 142 located between the first electrode 116 and the bonding pad 130 or between the second electrode 118 and the bonding pad 134 to electrically connect the corresponding light-emitting unit to the circuit layer 110. In some embodiments, the force for pressing the second light emitting unit LE2 may be greater than the force for pressing the first light emitting unit LE1, so the height h1 of one of the first conductive particles 1421 between one of the first light emitting units LE1 and the circuit layer 110 may be greater than the height h2 of one of the second conductive particles 1422 between one of the second light emitting units LE2 and the circuit layer 110. For the same reason, in some embodiments, the projected area of ​​the first conductive particles 1421 may be smaller than the projected area of ​​the second conductive particles 1422. In some embodiments, the height h1 of the first conductive particles 1421 is different from the height h2 of the second conductive particles 1422.

[0048] Furthermore, Figure 5A black matrix layer (BM layer) BML is shown disposed between the first protective member PT1 or the second protective member PT2 and the circuit layer 110. The black matrix layer BML includes a shielding portion 113 disposed between two adjacent light-emitting units. The black matrix layer BML can reduce the amount of light scattered from one light-emitting unit to another light-emitting unit. The arrangement of the black matrix layer BML can be applied to other embodiments or variant embodiments of the present invention, that is, although not directly illustrated in other figures, Figure 5 However, the black matrix layer BML may still be provided in the structures of the embodiments and variant embodiments of the present invention, which will not be described in detail.

[0049] Figure 6 Schematic cross-sectional view of an electronic device or a foldable display device according to a fourth embodiment of the present invention. In some embodiments, the circuit layer 110 includes a first bonding pad 1301 disposed in the first display region R1 and a second bonding pad 1302 disposed in the foldable display region RF. The first bonding pad 1301 corresponds to one of the first light-emitting units LE1 and has an area Wp1. The second bonding pad 1302 corresponds to one of the second light-emitting units LE2 and has an area Wp2. The area Wp1 may be different from the area Wp2. Figure 6 , the first bonding pad 1301 and the second bonding pad 1302 of different widths may represent the first and second bonding pads of different areas. For example, the area Wp2 may be greater than the area Wp1. In the foldable display region RF, the second bonding pad 1302 having a larger area may improve the bonding effect and the firmness of the bonding, so as to reduce the chance of damage to the components in the foldable display region RF when the foldable display region 100 is bent. In addition, in this embodiment, the side wall 138s of the groove 138 on the flexible substrate SUB and the connecting portion 138c of the bottom surface SUB1 of the flexible substrate SUB may be a curved surface, and the side wall 138s may form an angle θ with the bottom surface SUB1 of the flexible substrate SUB. In some embodiments, the angle θ may be an obtuse angle, but the present invention is not limited thereto.

[0050] Figure 7This is a schematic top view of an electronic device or a foldable display device of a variation of the fourth embodiment of the present invention. In this variation, multiple or all of the second bonding pads 1302 located in the foldable display region RF may have one or more openings OPN. The openings OPN may be arranged in one of the second bonding pads 1302 in a fixed period or randomly. When the foldable display device 100 is bent, the provision of the openings OPN on the second bonding pad 1302 may reduce the possibility of cracking and assist in releasing the stress accumulated in the second bonding pad 1302. The area of ​​a single second bonding pad 1302 may be greater than the area of ​​a single first bonding pad 1301. Among them, the area of ​​a single second bonding pad 1302 represents the area or region occupied by the second bonding pad 1302 (including the area occupied by the openings OPN), and may also be defined by the outer edge of the second bonding pad 1302. In some variant embodiments, the area of ​​the second bonding pad 1302 having the opening OPN in the foldable display area RF may be the same as the area of ​​the first bonding pad 1301 in the first display area R1 or the second display area R2. In the above case, the area of ​​the second bonding pad 1302 also includes the area occupied by the opening OPN.

[0051] Figure 8 Schematic cross-sectional view of an electronic device or a foldable display device according to the fifth embodiment of the present invention. In some embodiments, the foldable display device 100 may be an active display device, wherein the circuit layer 110 may include a plurality of driving units, but the present invention is not limited thereto. For example, the driving unit for driving the light-emitting unit may include a thin film transistor (TFT) 154. A single thin film transistor 154 may include a gate GE, a source SE, a drain DE and a semiconductor layer SC, wherein the source SE and the drain DE are electrically connected to the semiconductor layer SC, respectively, and an insulating layer IN is located between the gate GE and the semiconductor layer SC. The source SE may be electrically connected to a signal line. The drain DE may be electrically connected to a bonding pad 130 or a connection layer, and electrically connected to the first electrode 116 of the corresponding light-emitting unit via the bonding pad 130 or the connection layer. In this way, the thin film transistor 154 can drive the corresponding light-emitting unit. In this embodiment, the first light emitting unit LE1 and the second light emitting unit LE2 are vertical light emitting diodes, and the second electrodes 118 thereof are respectively electrically connected to a common electrode 132, and adjacent common electrodes 132 may not be connected to each other, but the present invention is not limited thereto. Figure 8As shown, in the first display region R1 or the second display region R2, a plurality of first black matrix portions BM1 are disposed on two adjacent first light-emitting units LE1, and in the foldable display region RF, a plurality of second black matrix portions BM2 are disposed on two adjacent second light-emitting units LE2. A height H5 of the first black matrix portion BM1 may be less than a height H6 of the second black matrix portion BM2. When the foldable display device 100 is bent, the higher second black matrix portion BM2 may reduce the crosstalk problem caused by the relative movement between layers or between components in the foldable display region RF.

[0052] Fig. 9 Schematic cross-sectional view of an electronic device or a foldable display device according to the sixth embodiment of the present invention. In some embodiments, the foldable display device 100 may be an active display device, wherein the circuit layer 110 may include a plurality of driving units, and the light-emitting unit may be an inverted packaged light-emitting diode, but the present invention is not limited thereto. A single light-emitting unit may be driven by a driving unit, and the driving unit may be a thin film transistor 154. For example, the first electrode 116 of the light-emitting unit is electrically connected to the bonding pad 130 of the circuit layer 110, and the bonding pad 130 may be further electrically connected to a common source, and the drain DE of the thin film transistor 154 may be electrically connected to the second electrode 118 via the bonding pad 134. The thickness H2 of the second protective member PT2 may be greater than the thickness H1 of the first protective member PT1, and the thickness H4 of the flexible substrate SUB in the foldable display region RF may be less than the thickness H3 of the flexible substrate SUB in the first display region R1 or the second display region R2, so the second ratio Ra2 is greater than the first ratio Ra1. In addition, in the foldable display region RF, the second black matrix portion BM2 disposed between two adjacent second light-emitting units LE2 includes a first black matrix layer BM21 and a second black matrix layer BM22 stacked on the first black matrix layer BM21, and the first black matrix layer BM21 and the second black matrix layer BM22 may be composed of different materials. In some embodiments, the second black matrix layer BM22 is composed of a material having a density lower than that of the first black matrix layer BM21, or the Young's modulus of the second black matrix layer BM22 is lower than that of the first black matrix layer BM21. When the foldable display device 100 is bent, the upper layer of the second black matrix portion BM2 will be subjected to greater stress, so the second black matrix layer BM22 with a lower density or a lower Young's modulus can reduce the probability of damage to the second black matrix portion BM2. In some embodiments, the height H6 of the second black matrix portion BM2 may be greater than the height H5 of the first black matrix portion BM1 to reduce the light leakage between adjacent second light-emitting units LE2 when the foldable display device 100 is bent. In some further embodiments, height H6 may be substantially the same as height H5.

[0053] Fig.10 Schematic cross-sectional view of an electronic device or a foldable display device according to the seventh embodiment of the present invention. In some embodiments, in order to reduce light leakage, a black matrix portion BM may be disposed between any two adjacent first light-emitting units LE1 of the first display region R1 and the second display region R2. However, no black matrix portion is disposed between any two adjacent second light-emitting units LE2 in the foldable display region RF. A self-reflective layer 136 may be disposed on the side wall of the second light-emitting unit LE2 and on some portions of the bottom surface to reduce light leakage. In the foldable display region RF, replacing the black matrix portion BM with a self-reflective layer 136 can improve the light shielding effect, because light leakage caused by the movement of the black matrix portion BM between layers does not occur in the foldable display region RF.

[0054] like Fig.10 As shown, the bottom surface SUB1 of the flexible substrate SUB may be a pattern having grooves 1381, 1382 and protrusions SUB11, SUB12. The grooves 1381, 1382 may include curved sidewalls respectively, but the present invention is not limited thereto. The grooves 1381 and the first light-emitting units LE1 are alternately arranged in the first display region R1 and the second display region R2. In other words, the grooves 1381 do not overlap with the first light-emitting units LE1 in the direction D3, and are arranged between two adjacent first light-emitting units LE1 in the direction D1. The grooves 1382 and the second light-emitting units LE2 are alternately arranged in the foldable display region RF. The grooves 1382 do not overlap with the second light-emitting units LE2 in the direction D3, and are arranged between any two adjacent second light-emitting units LE2 in the direction D1. Since the grooves 1381, 1382 do not overlap with the first light-emitting units LE1 and the second light-emitting units LE2, by arranging the light-emitting units in the thicker area of ​​the flexible substrate SUB, the flexible substrate SUB can provide good structural strength for the light-emitting units. On the other hand, each light-emitting unit can maintain its original optical performance through this design. One protrusion SUB11 can correspond to more than two first light-emitting units LE1, for example, corresponding to three first light-emitting units LE1 to form a pixel. One protrusion SUB12 can correspond to one second light-emitting unit LE2, and one second light-emitting unit LE2 can be regarded as a sub-pixel. The grooves 1381 are respectively arranged between any two adjacent protrusions SUB11, and the grooves 1382 are arranged between any two adjacent protrusions SUB12. Therefore, the configuration density of the grooves 1382 (that is, the number of grooves per unit area) is greater than the configuration density of the grooves 1381. In some other embodiments, the configuration density of the grooves 1382 and 1381 may be substantially the same, wherein a single protrusion SUB11 corresponds to a single first light-emitting unit LE1, and a single groove 1381 is located between any two first light-emitting units LE1. As Fig.10As shown, in the foldable display area RF, although the thickness H4 (referring to the maximum thickness, or the thickness of the protrusion SUB12) of the flexible substrate SUB may be the same as the thickness H3 (referring to the maximum thickness, or the thickness of the protrusion SUB11) of the flexible substrate SUB in the first display area R1, the thickness H2 of the second protective member PT2 may be greater than the thickness H1 of the first protective member PT1, so that the second ratio Ra2 is greater than the first ratio Ra1.

[0055] Fig.11 Schematic cross-sectional view of an electronic device or a foldable display device according to the eighth embodiment of the present invention. In some embodiments, the area or size of the first light emitting unit LE1 is different from that of the second light emitting unit LE2. For example, the width WL1 of the first light emitting unit LE1 in the direction D1 may be greater than the width WL2 of the second light emitting unit LE2 in the same direction D1, indicating that the size or area (or projected area) of the first light emitting unit LE1 is greater than the size or area (or projected area) of the second light emitting unit LE2. Fig.11As shown, in some embodiments, the first light emitting unit LE1 and the second light emitting unit LE2 may be blue light emitting diodes, and a plurality of first light conversion elements QD11 and QD12 are disposed on at least a portion of the first light emitting unit LE1, and a plurality of second light conversion elements QD21 and QD22 are disposed on at least a portion of the second light emitting unit LE2. The first light conversion element QD11 and the second light conversion element QD21 can convert blue light into red light. The first light conversion element QD12 and the second light conversion element QD22 can convert blue light into green light. Therefore, in the foldable display device 100, the sub-pixel units U11 and U21 can represent a red sub-pixel capable of generating red light, the sub-pixel units U12 and U22 can represent a green sub-pixel capable of generating green light, and the sub-pixel units U13 and U23 not covered by the light conversion elements can represent a blue sub-pixel capable of generating blue light. In the first display region R1 or the second display region R2, one sub-pixel U11, one sub-pixel U12, and one sub-pixel U13 may form one pixel PX. In the foldable display region RF, one sub-pixel U21, one sub-pixel U22, and one sub-pixel U23 may form one pixel PX. In some embodiments, the area WQ1 or size of the first light conversion element QD11 or QD12 may be different from the area WQ2 of the second light conversion element QD21 or QD22. For example, the area WQ2 (or width) of the second light conversion element QD21 or QD22 may be greater than the area WQ1 (or width) of the first light conversion element QD11 or QD12. When the foldable display device 100 is bent, the second light conversion element QD21 or QD22 having a larger area may reduce crosstalk problems or undesirable color mixing problems by having a larger coverage area. The first light conversion elements QD11 , QD12 and the second light conversion elements QD21 , QD22 may include quantum dot materials, but the present invention is not limited thereto.

[0056] Fig.12 FIG. 1 is a top view of an electronic device or a foldable display device according to a ninth embodiment of the present invention. Fig.12Only the light-emitting units and the grooves 138 are drawn, and most of the layers and other elements on the flexible substrate SUB are omitted. In some embodiments, a distance d1 between two adjacent first light-emitting units LE1 may be different from a distance d2 between two adjacent second light-emitting units LE2. For example, the distance d1 may be smaller than the distance d2, so the number of first light-emitting units LE1 per inch in the first display area R1 or the second display area R2 may be greater than the number of second light-emitting units LE2 per inch in the foldable display area RF. In other words, the configuration density of the first light-emitting units LE1 in the first display area R1 or the second display area R2 may be greater than the configuration density of the second light-emitting units LE2 in the foldable display area RF. In the foldable display area RF, a lower configuration density of the second light-emitting units LE2 can reduce the probability of damage to the second light-emitting units LE2. Furthermore, as Fig.12 As shown, in the flexible substrate SUB, at least in the foldable display region RF, a plurality of grooves 138 may be included. The grooves 138 (shown by oblique lines) may be in the shape of long strips extending along the direction D2 and located between two adjacent second light emitting units LE2. In some embodiments, the number of first light emitting units LE1 per inch in the first display region R1 or the second display region R2 may be different from the number of second light emitting units LE2 per inch in the foldable display region RF.

[0057] Fig.13 FIG. 1 is a top view of an electronic device or a foldable display device according to a tenth embodiment of the present invention. Fig.13 As shown, the groove 138 of the flexible substrate SUB can be disposed in the first display region R1, the second display region R2 and the foldable display region RF, and the groove 138 can be in a square shape. The groove 138 and the light emitting unit can be staggered, for example, a groove 138 can be disposed between two adjacent first light emitting units LE1 or two adjacent second light emitting units LE2. Fig.13 In the embodiment, the distance between any two adjacent light emitting units may be approximately the same, but the present invention is not limited thereto.

[0058] Fig.14 FIG. 1 is a cross-sectional view of an electronic device or a foldable display device according to an eleventh embodiment of the present invention. Fig.14As shown, a plurality of first light-emitting units LE1 as mentioned in the above-mentioned embodiments are arranged in the first display area R1 and the second display area R2, so a single light-emitting unit LE1 can generate a colored light, such as red light, green light or blue light. In contrast, a plurality of light-emitting groups LEP2 are arranged in the foldable display area RF. A light-emitting group LEP2 includes a plurality of integrated light-emitting diodes. In detail, a light-emitting group LEP2 can be formed by combining and packaging two or more second light-emitting units LE2. For example, three light-emitting units can be integrated into a light-emitting group LEP2. Furthermore, for example, three blue light-emitting diodes can be packaged into a light-emitting group LEP2, and a light conversion element 1521, a light conversion element 1522 and a filling body 1523 can be respectively arranged on each second light-emitting unit LE2, wherein the light conversion element 1521 can convert blue light into red light, the light conversion element 1522 can convert blue light into green light, and the filling body 1523 can be a transparent layer. The filter layer 150 can be selectively disposed on the light conversion element 1521 and the light conversion element 1522 to filter blue light. Therefore, the second light emitting unit LE2 in the light emitting group LEP2 and the light conversion element 1521, the light conversion element 1522 and the filler 1523 can generate red light, green light and blue light together, and the light emitting group LEP2 can generate light mixed with three different colored lights. Such a design can improve the light mixing state in the foldable display area RF. In some other embodiments, the second light emitting group LEP2 can encapsulate different light emitting diodes that can generate three different colored lights.

[0059] Fig.15 FIG. 1 is a cross-sectional view of an electronic device or a foldable display device according to a twelfth embodiment of the present invention. Fig.15 As shown, the integrated light-emitting diodes can also be used in the first display area R1 and the second display area R2. For example, a plurality of light-emitting groups LEP1 can be arranged in the first display area R1 and / or the second display area R2, and a plurality of light-emitting groups LEP2 can also be arranged in the foldable display area RF. Two or more first light-emitting units LE1 can be integrated into one light-emitting group LEP1, and two or more second light-emitting units LE2 can be integrated into one light-emitting group LEP2. The number of first light-emitting units LE1 integrated into one light-emitting group LEP1 can be different from (here, for example, greater than) the number of second light-emitting units LE2 integrated into one light-emitting group LEP2. In some embodiments, as Fig.15 As shown, the number of the first light emitting units LE1 integrated in one light emitting group LEP1 is 12, and the number of the second light emitting units LE2 integrated in one light emitting group LEP2 is 3, but the present invention is not limited thereto.

[0060] Please refer to Fig.16 and Fig.17 . Fig.16 It is a top view schematic diagram of an electronic device or a foldable display device according to a thirteenth embodiment of the present invention. Fig.17 for Fig.16 The light emitting unit and the circuit layer are shown in an enlarged cross-sectional view along the tangent lines AA' and BB'. A plurality of pixels PX are defined on the flexible substrate SUB. Fig.16As shown, the first display area R1 includes a plurality of first pixel areas 32, and the foldable display area RF includes a plurality of second pixel areas 34. In this specification, a pixel area means the smallest repeating area with display function. A pixel area may include primary color sub-pixels, such as three primary color sub-pixels such as red, green, and blue. In some embodiments, a group of repeated light-emitting diodes will form a pixel area. Or, in some embodiments, a region having a single repeated electrode (such as an anode) or a group of repeated electrodes can be regarded as a pixel area. In other embodiments, a region having a group of repeated bonding pads (such as bonding pads 130) can be regarded as a pixel area. For example, each bonding pad in each group can correspond to a primary color light-emitting diode, but the present invention is not limited thereto. According to some embodiments, in a pixel area, in addition to a group of basic red, green, and blue light-emitting diodes, the pixel area may also be provided with at least one group of redundant red, green, and blue light-emitting diodes. The spare light-emitting unit may be electrically connected to the corresponding basic light-emitting unit. When the basic light-emitting unit fails, the corresponding spare light-emitting unit may replace the basic light-emitting unit to emit light. Therefore, according to some embodiments, spare light-emitting units may be provided in some pixel areas. In detail, two red LEDs, two green LEDs and two blue LEDs can be arranged in a pixel area 32 of the first display area R1, and three red LEDs, three green LEDs and three blue LEDs can be arranged in a pixel area 34 of the foldable display area RF. In some embodiments, the light-emitting units arranged in the LN1 row along the direction D1 can be used as basic light-emitting units, and the light-emitting units arranged in the LN2 or LN3 row along the direction D1 can be used as spare light-emitting units. Since the second light-emitting unit LE2 in the foldable display area RF has a higher probability of damage than the first light-emitting unit LE1, the number of the second light-emitting units LE2 in a pixel area in the foldable display area RF can be designed to be greater than the number of the first light-emitting units LE1 in a pixel area in the first display area R1. Specifically, a first portion 325 of a plurality of first light emitting units LE1 is disposed in a first pixel region 32, and a second portion 345 of a plurality of second light emitting units LE2 is disposed in a second pixel region 34. The number of the first portion 325 of the first light emitting unit LE1 (6 light emitting diodes) is different from (taken as an example here less than) the number of the second portion 345 of the second light emitting unit LE2 (9 light emitting diodes). In some other embodiments, before testing is performed, the spare first light emitting units LE1 and spare second light emitting units LE2 of the LN2 row and the LN3 row may not be bonded to the flexible substrate SUB, and only the spare bonding pads are first configured on the LN2 row and the LN3 row.After performing a test, such as performing a bending test, if a defect or abnormality is found, a spare light emitting unit may be bonded to a corresponding bonding pad to replace the damaged light emitting unit.

[0061] Fig.18 FIG. 1 is an enlarged top view of a pixel in a foldable display device according to the fourteenth embodiment of the present invention. In some embodiments, a pixel PX may have a predetermined bonding region PCR for bonding to a light-emitting unit, wherein the predetermined bonding region PCR may include a bonding pad 130 for electrically connecting to a red light-emitting diode, a green light-emitting diode, a blue light-emitting diode, and a common electrode of the light-emitting unit, respectively. Fig.18 In addition, a spare bonding area PCR' can be selectively provided here, and the spare bonding area PCR' can also include a spare bonding pad 130', represented by "R1", "G1", "B1", "C1". The spare bonding area PCR' can be rotated by an angle α relative to the predetermined bonding area PCR, and the spare bonding pad 130' does not overlap with the bonding pad 130. If damage occurs, the originally bonded light-emitting unit can be removed from the predetermined bonding area PCR, and a new light-emitting unit can be bonded to the spare bonding area PCR'.

[0062] Fig.19 1 is a schematic top view of an electronic device or a foldable display device according to the fifteenth embodiment of the present invention. The first display region R1 includes a plurality of first pixel regions 32, and the foldable display region RF includes a plurality of second pixel regions 34. According to some embodiments, in addition to a set of basic bonding pads, at least one set of spare bonding pads may be provided in a pixel region. If damage occurs, the originally bonded light-emitting unit may be removed, and the same or different light-emitting unit may be bonded to the spare bonding pad. Therefore, according to some embodiments, spare bonding pads may be provided in some pixel regions. In detail, in a pixel region 32 of the first display region R1, the number of first bonding pads 327 may be different from (here, less than, for example) the number of second bonding pads 347 in a pixel region 34 of the foldable display region RF. In some embodiments, the bonding pads arranged in the LN1 row along the direction D1 may be used as basic bonding pads, and the bonding pads arranged in the LN2 or LN3 row along the direction D1 may be used as spare bonding pads. Fig.19 It is shown that the light emitting unit is bonded to the basic bonding pads arranged in the LN1 row, but the present invention is not limited thereto.

[0063] According to the present invention, in the first display area of ​​the foldable display device, a first ratio of the thickness of the first protective member to the thickness of the flexible substrate is smaller than a second ratio of the thickness of the second protective member to the thickness of the flexible substrate in the foldable display area. Therefore, the bonding reliability of the second light-emitting unit in the foldable display area can be improved.

[0064] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A foldable electronic device comprising a first area, a second area, and a foldable area connecting the first area and the second area, characterized in that: The foldable electronic device comprises: a flexible substrate; A plurality of first electronic units are disposed on the flexible substrate and located in the first area; and A plurality of second electronic units are disposed on the flexible substrate and located in the foldable area; The flexible substrate has a first protrusion located in the first area, a second protrusion located in the foldable area, and a first groove arranged between the first protrusion and the second protrusion, and the width of the first protrusion is greater than the width of the second protrusion.

2. The foldable electronic device according to claim 1, characterized in that: The first protrusion is adjacent to the second protrusion.

3. The foldable electronic device according to claim 1, characterized in that: The flexible substrate further includes a third protrusion and a second groove. The third protrusion is located in the foldable area and adjacent to the second protrusion. The second groove is arranged between the second protrusion and the third protrusion. The width of the first protrusion is greater than that of the third protrusion.

4. The foldable electronic device according to claim 1, wherein: The first groove has a long strip shape in a top-view direction of the foldable electronic device.

5. The foldable electronic device according to claim 1, wherein: A connecting portion between the side wall of the first groove and the bottom surface of the flexible substrate is a curved surface.

6. The foldable electronic device according to claim 1, wherein: The thickness of the flexible substrate in the first region is greater than the thickness of the flexible substrate in the foldable region.

7. The foldable electronic device according to claim 1, wherein: Also includes: a first protective member, disposed on at least one of the plurality of first electronic units; as well as a second protective member, disposed on at least one of the plurality of second electronic units; Wherein, the thickness of the second protective member is greater than the thickness of the first protective member.

8. The foldable electronic device according to claim 7, characterized in that: In the first area, the ratio of the thickness of the first protective member to the thickness of the flexible substrate is defined as a first ratio, and in the foldable area, the ratio of the thickness of the second protective member to the thickness of the flexible substrate is defined as a second ratio, and the second ratio is greater than the first ratio.

Images