Patent Publication Number: US-2023154901-A1

Title: Display panel and manufacturing method thereof

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Taiwanese application no. 110142500, filed on Nov. 16, 2021. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
     BACKGROUND 
     Technical Field 
     The disclosure relates to a display panel and a manufacturing method thereof. Particularly, the disclosure relates to a display panel and a manufacturing method thereof in which light directivity or light transmittance can be improved. 
     Description of Related Art 
     At present, during a process of manufacturing a micro light-emitting diode (micro LED) display panel, after a micro light-emitting diode is transferred to a circuit substrate, a light-shielding layer (e.g., a black matrix) may be separately manufactured, covering the circuit substrate and shielding a gap between each sub-pixel, to thus prevent crosstalk between lights emitted by the sub-pixels. However, since the light-shielding layer is manufactured on a panel, it is required to pay particular attention to high temperature and circuit protection, thus making the process relatively difficult. In addition, the separately manufactured light-shielding layer completely covers the gaps between the sub-pixels, leading to relatively poor transparency of the display panel. 
     Based on the requirements of display screens, in the light-shielding layer, a patterned transparent region is required to be manufactured corresponding to a light-emitting region of the sub-pixel. However, since the light-shielding layer is a non-transparent material, when the light-shielding layer has a relatively great thickness, it may cause an unsmooth exposure of the bottom of the light-shielding layer in a photolithography process, and cause the thickness of the light-shielding layer to be limited by the manufacturing process. 
     SUMMARY 
     The disclosure provides a display panel and a manufacturing method thereof, in which light directivity can be improved, light transmittance (or transparency) of the display panel can be improved, a product yield can be increased, or an amount of costs can be saved. 
     A display panel of the disclosure includes a circuit substrate and a plurality of micro light-emitting diode structures. The micro light-emitting diode structures each include a micro light-emitting chip and a molding structure. The micro light-emitting chip is electrically bonded to the circuit substrate. The micro light-emitting chip includes a first surface, a second surface, and a peripheral surface. The first surface is located on a side of the micro light-emitting chip facing the circuit substrate. The second surface is disposed opposite to the first surface. The peripheral surface connects the first surface and the second surface. The molding structure surrounds the peripheral surface and encloses the second surface of the micro light-emitting chip. The molding structure extends in a direction away from the circuit substrate and forms an inner side wall. The inner side wall and the second surface constitute an accommodating portion. 
     In an embodiment of the disclosure, the molding structure extends from the peripheral surface to the first surface of the micro light-emitting chip. 
     In an embodiment of the disclosure, each of the micro light-emitting chip further includes at least one electrode. The at least on electrode is disposed on the first surface and exposed from the molding structure, and is electrically connected to the circuit substrate. 
     In an embodiment of the disclosure, there is a gap between the molding structure and the circuit substrate. 
     In an embodiment of the disclosure, the second surface of each of the micro light-emitting chip is divided into a central part and a peripheral part. The peripheral part is covered by the molding structure. A ratio of an area of the central part to an area of the second surface is greater than or equal to 0.7. 
     In an embodiment of the disclosure, there is an included angle between the inner side wall and the second surface. The included angle is between 90 degrees and 150 degrees. 
     In an embodiment of the disclosure, the molding structure has an end portion. A distance between the end portion and the second surface is between 3 micrometers and 10 micrometers. 
     In an embodiment of the disclosure, the molding structure has an end portion. A cross-sectional area of the accommodating portion gradually increases from the second surface toward the end portion. 
     In an embodiment of the disclosure, the circuit substrate has an exposed region. The exposed region is located between orthogonal projections of any adjacent two of the micro light-emitting diode structures on the circuit substrate. The exposed region is not overlapped with orthogonal projections of the molding structures on the circuit substrate. 
     In an embodiment of the disclosure, the molding structure includes a non-transparent material. 
     In an embodiment of the disclosure, each of the micro light-emitting diode structures further includes a light guide layer. The light guide layer is disposed on the second surface. 
     A manufacturing method of a display panel of the disclosure includes the following. A carrier substrate is provided. A plurality of connecting layers are formed on the carrier substrate. A plurality of micro light-emitting chips are provided. Each of the micro light-emitting chips has a first surface, a second surface opposite to the first surface, and a peripheral surface connecting the first surface and the second surface. The carrier substrate is operated, and the connecting layers are bonded to the corresponding second surfaces, such that the first surface is located on a side of the micro light-emitting chip away from the carrier substrate. A molding structure is formed on each of the micro light-emitting chips, such that each of the molding structures extends along a side wall of each of the connecting layers to the peripheral surface and the first surface of each of the micro light-emitting chips. A circuit substrate is provided. The carrier substrate is operated, and each of the micro light-emitting chips is bonded to the circuit substrate. At least a part of each of the connecting layers is removed to separate the micro light-emitting chips from the carrier substrate. Each of the molding structures encloses the second surface of each of the micro light-emitting chips, and constitutes an accommodating portion together with the second surface. 
     In an embodiment of the disclosure, the step of forming the connecting layers on the carrier substrate further includes the following. The connecting layers are connected to each other to form a protection layer on the carrier substrate. The protection layer is located between the molding structures and the carrier substrate. 
     In an embodiment of the disclosure, the molding structures cover the first surface. The manufacturing method further includes the following. A part of the molding structure on the first surface is removed to expose at least one electrode of each of the micro light-emitting chips. 
     In an embodiment of the disclosure, the manufacturing method further includes the following. Patterning is performed to remove a part of the molding structure according to an exposure pattern. An orthogonal projection of the exposure pattern on the carrier substrate is not overlapped with orthogonal projections of micro light-emitting diode structures on the carrier substrate. 
     In an embodiment of the disclosure, in the step of forming the connecting layers on the carrier substrate, the connecting layers are in a shape of a rectangular cuboid, a truncated cone, or a square frustum. 
     In an embodiment of the disclosure, in the step of forming the connecting layers on the carrier substrate, a cross-sectional area of the connecting layers gradually decreases in a direction away from the carrier substrate. 
     In an embodiment of the disclosure, the removing each of the connecting layers further includes the following. A part of the connecting layers is retained on the second surface. 
     Based on the foregoing, in the display panel and the manufacturing method thereof according to the embodiments of the disclosure, since the molding structure may extend on the peripheral surface and the first surface of the micro light-emitting chip, crosstalk between lights emitted by two adjacent micro light-emitting chips can be prevented, and light directivity can be improved. Furthermore, compared to general steps of manufacturing in which a relatively thick molding structure cannot be manufactured because of limitations of a photolithography process, in the manufacturing method of a display panel of the embodiments of the disclosure, a relatively thick molding structure can be easily adjusted or manufactured as required by changing the height of the connecting layer. In addition, since the forming the molding structure may be performed on the carrier substrate (temporary substrate), it is not required to perform complicated and relatively difficult processes such as high temperature and circuit protection processes on the circuit substrate in the subsequent manufacturing process, thus greatly improving the product yield. 
     To make the aforementioned more comprehensible, several embodiments accompanied with drawings are described in detail as follows. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure. 
         FIG.  1 A  to  FIG.  1 F  are schematic cross-sectional views of a manufacturing method of a display panel according to an embodiment of the disclosure. 
         FIG.  2 A  is a schematic cross-sectional view of a manufacturing method of a display panel according to another embodiment of the disclosure. 
         FIG.  2 B  is a schematic cross-sectional view of a manufacturing method of a display panel according to another embodiment of the disclosure. 
         FIG.  3    is a schematic cross-sectional view of a display panel according to another embodiment of the disclosure. 
         FIG.  4 A  to  FIG.  4 B  are schematic cross-sectional views of a manufacturing method of a display panel according to another embodiment of the disclosure. 
         FIG.  5    is a schematic cross-sectional view of a display panel according to another embodiment of the disclosure. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
       FIG.  1 A  to  FIG.  1 F  are schematic cross-sectional views of a manufacturing method of a display panel according to an embodiment of the disclosure. A manufacturing method of a display panel  100  of this embodiment includes the following. 
     With reference to  FIG.  1 A , first, a carrier substrate  110  is provided. The carrier substrate  110  is, for example but not limited to, a temporary substrate such as a plastic substrate, a glass substrate, or a substrate. 
     Next, a plurality of connecting layers  120  are formed on the carrier substrate  110 . Each of the connecting layers  120  has an upper surface  121  and a side wall  123  connected to the upper surface  121 . In this embodiment, the material of the connecting layer  120  may be a transparent material. The material of the connecting layer  120  may be, for example but not limited to, polydimethylsiloxane (PDMS) or a SU-8 polymer. In this embodiment, the connecting layer  120  is substantially in a shape of a rectangular cuboid, but not limited thereto. In some embodiments, the connecting layer  120  may also be in a shape of a truncated cone (not shown) or a square frustum (as shown in  FIG.  4 A  and  FIG.  4 B ). 
     Then, with reference to  FIG.  1 B , a plurality of micro light-emitting chips  130  are provided. The micro light-emitting chips  130  are, for example but not limited to, a micro LED (mLED/µLED) or an organic light-emitting diode (OLED). Each of the micro light-emitting chips  130  has a first surface  131 , a second surface  132  opposite to the first surface  131 , and a peripheral surface  133  connecting the first surface  131  and the second surface  132 . Each of the micro light-emitting chips  130  includes at least one electrode  134  (two electrodes being schematically shown in  FIG.  1 B  as an example) and an isolating layer  135 . The isolating layer  135  is disposed on the first surface  131  of the micro light-emitting chip  130 , and exposes part of the first surface  131 . The electrode  134  is disposed on the first surface  131  of the micro light-emitting chip  130 , and disposed on the part of the first surface  131  exposed by the isolating layer  135 . 
     Next, the micro light-emitting chips  130  are respectively bonded to the connecting layers  120 . Additionally, although in  FIG.  1 B , the second surface  132  of the micro light-emitting chip  130  and the upper surface  121  of the connecting layer  120  have the same width (or area), in other embodiments (in  FIG.  3   , for example), the second surface  132  and the upper surface  121  may have different dimensions. 
     Normal side pressing may be adopted for the above-mentioned bonding process. For example, the micro light-emitting chips  130  are fixed on another substrate, and pressed to the connecting layers  120  on the carrier substrate  110 . Alternatively, it is also possible to operate the carrier substrate  110 , and bond the upper surfaces  121  of the connecting layers  120  to the second surfaces  132  of the corresponding micro light-emitting chips  130 , but the disclosure is not limited thereto. At this time, the first surface  131  of the micro light-emitting chip  130  is located on a side of the micro light-emitting chip  130  away from the carrier substrate  110 . 
     As shown in  FIG.  1 C , next, a molding structure  140  is formed on each of the micro light-emitting chips  130 , so that the molding structure  140  may extend along the side wall  123  of each connecting layer  120  to the peripheral surface  133  and the first surface  131  of each micro light-emitting chip  130 . 
     In this embodiment, the molding structure  140  may be formed by, for example but not limited to, coating. In this embodiment, the material of the molding structure  140  may be a non-transparent material or a light-shielding material, to reduce crosstalk between lights emitted by two adjacent micro light-emitting chips (i.e., the micro light-emitting chips  130 ), and improve light directivity. The material of the molding structure  140  may be, for example but not limited to, a black photoresist (for example, containing carbon black), a white photoresist (for example, containing titanium dioxide), or a gray photoresist (for example, containing carbon black and titanium dioxide in certain proportions). When the molding structure  140  has a relatively dark color, the molding structure  140  has a relatively strong light absorption and a relatively high contrast; on the contrary, when the molding structure  140  has a relatively light color, the molding structure  140  is relatively likely to emit light by reflection and has a relatively high brightness. In some embodiments, the material of the molding structure  140  may also be, for example but not limited to, resin, epoxy, polymethyl methacrylate (PMMA), polysiloxane, or polyimide (PI). In some embodiments, the material of the molding structure  140  may also be filled with metal particles to form a mixture to enhance reflection. 
     As shown in  FIG.  1 D , a part of the molding structure  140  on the first surface  131  of the micro light-emitting chip  130  is removed to expose the electrode  134  of each micro light-emitting chip  130 . In the meantime, the material at the junction between two adjacent molding structures  140  is also removed to form a gap G 1 . Here, the molding structure  140  is formed on each of the micro light-emitting chips  130  and covers the same. In addition, the molding structure  140  and the micro light-emitting chip  130  constitute a micro light-emitting diode structure  101 . In this embodiment, the part of the molding structure  140  may be removed by, for example but not limited to, photolithography. At this time, the electrode  134  of each micro light-emitting chip  130  may be exposed from the molding structure  140 . 
     With reference to  FIG.  1 E , after the above are completed, a circuit substrate  150  is provided. The circuit substrate  150  includes a plurality of pads  151  and a driving circuit (not shown), and the driving circuit may be electrically connected to the pads  151 . 
     Next, transferring the micro light-emitting chip  130  is performed: the carrier substrate  110  is operated, and the electrode  134  of each micro light-emitting chip  130  is bonded to the circuit substrate  150  through the pads  151 . At this time, the electrodes  134  of each micro light-emitting chip  130  may be in contact with the pads  151  and be electrically connected to the circuit substrate  150  through the pads  151 . In this embodiment, there is a gap G 2  between the molding structure  140  and the circuit substrate  150 . 
     Then, with reference to  FIG.  1 F , the material at the junction between at least a part of each connecting layer  120  and the carrier substrate  110  may be removed to separate the micro light-emitting chips  130  from the carrier substrate  110 . Further, the remaining connecting layer  120  is removed to expose the second surface  132  of each micro light-emitting chip  130  and an inner side wall  141  of the molding structure  140 . In this embodiment, the connecting layer  120  may be removed by, for example but not limited to, laser lift-off (LLO), isotropic etching, or anisotropic etching. At this time, the molding structure  140  encloses the second surface  132  of each micro light-emitting chip  130 , and the molding structure  140  extends in a direction away from the circuit substrate  150 . The inner side wall  141  of the molding structure  140  and the second surface  132  may form an accommodating portion C 1 . In this embodiment, the accommodating portion C 1  may be an air cavity for color conversion materials (e.g., quantum dots) and/or micro lenses to be filled therein in the subsequent manufacturing process, but not limited thereto. 
     In this embodiment, since the molding structure  140  may extend on the side wall  123  of the connecting layer  120 , the peripheral surface  133  of the micro light-emitting chip  130 , and the first surface  131  of the micro light-emitting chip  130 , crosstalk between lights emitted by two adjacent micro light-emitting chips  130  can be prevented, and light emission directivity (e.g., light emission in a direction away from the first surface  131 ) can be improved. 
     In this embodiment, the molding structure  140  has an end portion  143 . In the normal direction of the circuit substrate  150 , there is a distance D1 between the end portion  143  and the second surface  132  of the micro light-emitting chip  130 , and the distance D1 may be regarded as the depth of the accommodating portion C 1 . From the above description, it follows that since the distance D1 is determined by the height of the connecting layer  120 , that is, the molding structure  140  is not formed by a photolithography process; therefore, by changing the height of the connecting layer  120 , the distance D1 and/or the thickness of the molding structure  140  can be easily adjusted. Therefore, compared to general steps of manufacturing in which a relatively thick molding structure (i.e., a relatively deep accommodating portion) cannot be manufactured because of limitations of the photolithography process, the manufacturing method of the display panel  100  of this embodiment may not be limited by the process, meeting the requirements of different products. In this embodiment, the distance D1 may be, for example but not limited to, between 3 micrometers (µm) and 10 micrometers. 
     In this embodiment, the circuit substrate  150  may have a first region  150   a , a second region  150   b , and an exposed region  150   c . In the normal direction of the circuit substrate  150 , an orthogonal projection of the micro light-emitting chip  130  on the circuit substrate  150  may be substantially overlapped with the first region  150   a . An orthogonal projection of a part of the molding structure  140  on the circuit substrate  150  may be substantially overlapped with the second region  150   b . The exposed region  150   c  is located between orthogonal projections of any two adjacent micro light-emitting diode structures  101  on the circuit substrate  150 . In addition, the exposed region  150   c  is not overlapped with the orthogonal projection of the micro light-emitting chip  130  on the circuit substrate  150 , and is not overlapped with the orthogonal projection of the molding structure  140  on the circuit substrate  150 . In this embodiment, since the exposed region  150   c  of the circuit substrate  150  is not covered by the molding structure  140 , with the exposed region  150   c , the light transmittance of the display panel  100  (e.g., the circuit substrate  150  with transparency) of this embodiment can be improved. 
     It should be noted that, compared to a general display panel where a molding structure is produced only after micro light-emitting chips are transferred to a circuit substrate, in the manufacturing method of the display panel  100  of this embodiment, since the molding structure  140  may already be formed on the carrier substrate  110  (temporary substrate), it is not required to perform high temperature or other complicated and relatively difficult processes on the circuit substrate  150  in the subsequent manufacturing process, thus greatly improving the product yield, while omitting part of circuit protection. 
     In addition, since adhering the micro light-emitting chip  130  is one of the main ways of mass transfer of micro light-emitting diodes, in the manufacturing method of the display panel  100  of this embodiment, the connecting layer  120  is essentially a transfer unit in the transfer process. In other words, in this embodiment, conditions for forming the shape of the light-shielding layer are provided by the transfer unit in the originally existing process. Further, after the molding structure  140  is formed, since removal of the connecting layer  120  is also necessary in the transfer process, the accommodating portion C 1  is also naturally formed during the process of removal. Accordingly, since the manufacturing method of the display panel  100  of this embodiment is realized further on the basis of the existing mass transfer process, it is not required to add a large number of complicated manufacturing processes, significantly reducing the manufacturing costs of the light-shielding layer. 
     Other embodiments will be provided below to serve for description. It should be noted here that, the reference numerals and part of the contents of the above embodiments remain to be used in the following embodiments, where the same reference numerals are used to refer to the same or similar elements, and the description of the same technical content is omitted. Reference may be made to the above embodiments for the description of the omitted part, which will not be repeated in the following embodiments. 
       FIG.  2 A  is a schematic cross-sectional view of a manufacturing method of a display panel according to another embodiment of the disclosure.  FIG.  2 B  is a schematic cross-sectional view of a manufacturing method of a display panel according to another embodiment of the disclosure. With reference to  FIG.  1 A  to  FIG.  1 F  and  FIG.  2 A  and  FIG.  2 B  together, a display panel  100   a  of this embodiment is similar to the display panel  100  in  FIG.  1 A  to  FIG.  1 F , and the main differences are that a manufacturing method of the display panel  100   a  of this embodiment also includes the following. The connecting layers  120  are connected to each other to form a protection layer  125  on the carrier substrate  110 , and patterning is performed to remove a part of a molding structure  140   a  according to an exposure pattern  160 . 
     Specifically, with reference to  FIG.  1 A  and  FIG.  2 A  together, in this embodiment, at the time when the connecting layers  120  of  FIG.  1 A  are formed on the carrier substrate  110 , the protection layer  125  may be formed on the carrier substrate  110  and between the connecting layers  120  to connect the connecting layers  120  to each other through the protection layer  125 , and the protection layer  125  may be located between the molding structure  140   a  and the carrier substrate  110 . Next, when the molding structure  140   a  is subsequently formed, the molding structure  140   a  may cover the protection layer  125 . Accordingly, when the connecting layer  120  and the carrier substrate  110  are subsequently separated by a laser lift-off process, the protection layer  125  may serve to protect the end portion  143  of the molding structure  140   a , facilitating control of the depth (i.e., the distance D1) of the subsequently formed accommodating portion C 1 . In some embodiments, the protection layer  125  may be integrally formed with the connecting layer  120 . 
     Next, with reference to  FIG.  2 B  together, after the connecting layers  120  and the protection layer  125  are formed on the carrier substrate  110 , and then the molding structure  140   a  is formed to cover on the micro light-emitting chip  130 , the connecting layer  120 , and the protection layer  125 , the part of the molding structure  140   a  required to be removed is defined by the exposure pattern  160 . An orthogonal projection of the exposure pattern  160  on the carrier substrate  110  is not overlapped with the orthogonal projections of the micro light-emitting diode structures  101  on the carrier substrate  110 . 
     As shown in  FIG.  2 B , patterning is performed to remove a part of the molding structure  140   a  according to the exposure pattern  160 , and the removed part corresponds to the gap G 1  between the micro light-emitting chips  130 . The gap G 1  may expose the protection layer  125  below. Alternatively, since it is not necessary to retain the protection layer  125  in the subsequent transfer process, in the patterning here, part or all of the protection layer  125  below the molding structure  140   a  may be removed (not shown in the figures). 
       FIG.  3    is a schematic cross-sectional view of a display panel according to another embodiment of the disclosure. With reference to  FIG.  1 F  and  FIG.  3    together, a display panel  100   b  of this embodiment is similar to the display panel  100  in  FIG.  1 F , but the main differences between them are that, in the display panel  100   b  of this embodiment, the second surface  132  of each micro light-emitting chip  130  may be divided into a central part  1321  and a peripheral part  1322 . 
     Specifically, with reference to  FIG.  3    in conjunction with  FIG.  2 A , during the process of manufacturing the display panel  100   b  of this embodiment, since the width (or area) of the upper surface of the connecting layer (not shown) is smaller than the width (or area) of the second surface  132  of the micro light-emitting chip  130 , when the second surface  132  of the micro light-emitting chip  130  is bonded to the connecting layer, the central part  1321  of the second surface  132  covers the connecting layer, and the peripheral part  1322  of the second surface  132  is exposed. 
     Next, during the process of forming the molding structure  140 , since the molding structure  140  may be in contact with and cover the peripheral part  1322  exposed by the connecting layer, after the connecting layer is removed, the central part  1321  of the second surface  132  may be exposed by the molding structure  140 , and the peripheral part  1322  may still be covered by the molding structure  140 . A ratio of an area A1 of the central part  1321  to an area A2 of the second surface  132  may be, for example but not limited to, greater than or equal to 0.7 and less than 1 (i.e., 0.7≦A1/A2&lt;1). 
     In other words, for the second surface  132  of the micro light-emitting chip  130 , the width (or area) of the central part  1321  of may be substantially equal to the width (or area) of the upper surface of the connecting layer, and the width (or area) of the central part  1321  may be controlled by the width (or area) of the upper surface of the connecting layer. 
     In this embodiment, since the peripheral part  1322  of the second surface  132  of the micro light-emitting chip  130  may be covered by the molding structure  140 , and the central part  1321  may be exposed by the molding structure  140 , thereby the size of the light-emitting region (i.e., the central part  1321 ) is controlled to concentrate the emitted light of the micro light-emitting chip  130 . 
       FIG.  4 A  to  FIG.  4 B  are schematic cross-sectional views of a manufacturing method of a display panel according to another embodiment of the disclosure. With reference to  FIG.  1 A  to  FIG.  1 F  and  FIG.  4 A  and  FIG.  4 B  together, a display panel  100   c  of this embodiment is similar to the display panel  100  in  FIG.  1 A  to  FIG.  1 F , but the main differences between them are that, in a manufacturing method of the display panel  100   c  of this embodiment, a connecting layer  120   b  is substantially in a shape of a square frustum, and the second surface  132  also has the central part  1321  which is exposed and the peripheral part  1322  which is covered by a molding structure 140b. Specifically, with reference to  FIG.  4 A  first, in this embodiment, in forming the connecting layers  120   b  on the carrier substrate  110 , a cross-sectional area of the connecting layers  120   b  gradually decreases in a direction away from the carrier substrate  110 . 
     Next, in a way similar to  FIG.  1 B  and  FIG.  1 C , the micro light-emitting chips  130  are provided, the connecting layers  120   b  are bonded to the second surfaces  132  of the corresponding micro light-emitting chips  130 , the molding structure  140   b  is formed on the micro light-emitting chips  130 , a part of the molding structure  140   b  on the first surface  131  is removed, the circuit substrate  150  is provided, and the micro light-emitting chips  130  are bonded to the circuit substrate  150 . 
     Then, with reference to  FIG.  4 B , the connecting layers  120   b  may be removed to separate the micro light-emitting chips  130  from the carrier substrate  110  and expose the second surface  132  of each micro light-emitting chip  130  and the inner side wall  141  of the molding structure 140b. There is an included angle θ between the inner side wall  141  and the second surface  132 , and the included angle θ is, for example but not limited to, between 90 degrees and 150 degrees. In addition, in this embodiment, since a cross-sectional area of a accommodating portion C2 may gradually increase from the second surface  132  toward the end portion  143 , the accommodating portion C2 may provide a larger space for more color conversion materials and/or micro lenses to be filled therein in the subsequent manufacturing process. 
     In addition, in other embodiments, the connecting layer  120   b  may also have a different shape. For example, the accommodating portion C 1  of  FIG.  1 F  is formed by the connecting layer  120  in a shape of a rectangular cuboid. Nonetheless, the disclosure is not limited thereto. Depending on the requirements of different shapes of light, the connecting layer  120   b  may also have other shapes (for example but not limited to a shape of a truncated cone), to accordingly change the light-emitting area or shape of the central part  1321  of the second surface  132 . 
     By utilizing the connecting layer  120   b  and the molding structure  140 , in this embodiment, the light-emitting angle and region of the micro light-emitting chip  130  may be controlled to achieve the function of a light-shielding layer. In addition, compared to an existing light-shielding layer structure which is only disposed on the light-emitting side of the micro light-emitting diode, the molding structure  140  of this embodiment further extends on the peripheral surface  133  and the first surface  131  of the micro light-emitting chip  130 . Accordingly, in conjunction with the inner side wall  141  of the molding structure  140 , it is possible to ensure that the light emitted by the micro light-emitting chip  130  is emitted only from the upper side (i.e., the second surface  132 ), thus preventing lateral light leakage while achieving better light concentration. 
       FIG.  5    is a schematic cross-sectional view of a display panel according to another embodiment of the disclosure. With reference to  FIG.  1 F  and  FIG.  5    together, a display panel  100   d  of this embodiment is similar to the display panel  100  in  FIG.  1 F , but the main differences between them are that, in the display panel  100   d  of this embodiment, each micro light-emitting chip  130  further includes a light guide layer  180 . 
     Specifically, with reference to  FIG.  5   , in this embodiment, the light guide layer  180  is disposed on the second surface  132  of each micro light-emitting chip  130 . The light guide layer  180  may be, for example, a part of the connecting layer (not shown). To be specific, in a manufacturing method of the display panel  100   d  of this embodiment, when the connecting layer is removed, it is possible to not completely remove the connecting layer and retain a part of the connecting layer on the second surface  132 , so that the part of the connecting layer serves as the light guide layer  180 . 
     In summary of the foregoing, in the display panel and the manufacturing method thereof according to the embodiments of the disclosure, since the molding structure may extend on the peripheral surface and the first surface of the micro light-emitting chip, crosstalk between lights emitted by two adjacent micro light-emitting chips can be prevented, and light directivity can be improved. Next, since the molding structure does not cover the exposed region of the circuit substrate and can expose the exposed region of the circuit substrate, the light transmittance (or transparency) of the display panel of the embodiments of the disclosure can be improved. Furthermore, compared to general steps of manufacturing in which a relatively thick molding structure cannot be manufactured because of limitations of a photolithography process, in the manufacturing method of a display panel of the embodiments of the disclosure, a relatively thick molding structure can be easily adjusted or manufactured as required by changing the height of the connecting layer, so that the accommodating portion of the molding structure has better applicability (for example but not limited to filling quantum dot materials and/or refractive elements therein). In addition, since the forming the molding structure may be performed on the carrier substrate (temporary substrate), it is not required to perform complicated and relatively difficult processes such as high temperature and circuit protection processes on the circuit substrate in the subsequent manufacturing process, thus greatly improving the product yield. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the disclosure covers modifications and variations provided that they fall within the scope of the following claims and their equivalents.