Display module and vehicle-mounted display device

Abstract

The display module comprises a display panel, at least one flexible circuit board and at least one printed circuit board; the display panel comprises a plurality of connection pads located at a binding area; the flexible circuit board comprises a first body, a plurality of output pads and a plurality of input pads, the first body comprises a bendable part and a flat part connected with each other, the bendable part comprises a protruding part protruding compared with the flat part, the plurality of output pads are located at the protruding part and are connected with the plurality of connection pads in a binding mode, and the plurality of input pads are located at a side of the flat part away from the bendable part; and the printed circuit board comprises a second body and a plurality of binding pads, the second body comprises a strip-shaped main body part and at least one branch part connected with a long side of the strip-shaped main body part, the plurality of binding pads are located at at least one side edge of each branch part adjacent to the strip-shaped main body part, and the plurality of binding pads are connected with the plurality of input pads in a binding mode.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display module and an in-vehicle display device. Background Technology

[0002] As people's demands for in-vehicle display experiences increase, the forms of in-vehicle displays are becoming increasingly diversified. Traditional in-vehicle displays based on liquid crystal displays (LCDs) are typically flat or rigid with a large curvature R≥1000mm, which cannot meet the needs of diversified forms.

[0003] Currently, the mainstream trend is to realize various forms of automotive displays, such as small-radius bending and S-shapes, based on flexible organic light-emitting diodes (OLEDs). Summary of the Invention

[0004] The display module provided in this embodiment includes:

[0005] Display panel, at least one flexible circuit board, and at least one printed circuit board;

[0006] The display panel includes multiple connection pads located in the bonding area;

[0007] The flexible circuit board includes a first body, a plurality of output pads and a plurality of input pads. The first body includes a bendable portion and a flat portion connected to each other. The bendable portion includes a protrusion that protrudes from the flat portion. The plurality of output pads are located on the protrusion and are bonded to the plurality of connecting pads. The plurality of input pads are located on the side of the flat portion away from the bendable portion.

[0008] The printed circuit board includes a second body and a plurality of bonding pads. The second body includes a strip-shaped main body portion and at least one branch portion connected to the long side of the strip-shaped main body portion. The plurality of bonding pads are located on at least one side of each branch portion adjacent to the strip-shaped main body portion, and the plurality of bonding pads are bonded to the plurality of input pads.

[0009] In one possible implementation, the output pads extend along a first direction and are arranged sequentially along a second direction intersecting the first direction, and the input pads extend along a third direction and are arranged sequentially along a fourth direction intersecting the third direction, wherein the first direction and the fourth direction are substantially the same, and the second direction and the third direction are substantially the same.

[0010] In one possible implementation, the flat portion includes a first side adjacent to the protrusion, a second side opposite to the first side, and a third side away from the bendable portion. The first side and the second side both extend along the second direction, and the first side is longer than the second side. The third side is inclined at a predetermined angle relative to the first direction.

[0011] In one possible implementation, the fourth direction is approximately the same as the extension direction of the third side.

[0012] In one possible implementation, the flexible circuit board further includes a driver chip located in the flat portion, the driver chip being located on the side of the plurality of input pads near the bendable portion.

[0013] In one possible implementation, the driver chip extends generally along the first direction.

[0014] In one possible implementation, the extension direction of the driver chip is approximately the same as the extension direction of the third side of the flat portion away from the flexible portion.

[0015] In one possible implementation, the flexible circuit board further includes multiple signal traces, each of which is electrically connected to the driver chip and the corresponding output pad, and the lengths of the signal traces are approximately the same.

[0016] In one possible implementation, the signal traces electrically connected to the output pads closest to the driver chip among the plurality of output pads are designed as curves, while the signal traces electrically connected to the output pads away from the driver chip among the plurality of output pads are designed as straight lines.

[0017] In one possible implementation, the signal traces electrically connected to the output pads closest to the driver chip among the plurality of output pads have a shape in the orthographic projection on the flexible circuit board that includes at least one of a single triangle, a triangular zigzag, a single rectangle, a rectangular zigzag, and an arc.

[0018] In one possible implementation, the plurality of bonding pads extend along the third direction and are arranged sequentially along a fourth direction intersecting the third direction.

[0019] In one possible implementation, the plurality of bonding pads are provided on only one side adjacent to the short side of the strip body portion in two of the at least one branch portions located at the edge, while the plurality of bonding pads are provided on both sides adjacent to the strip body portion in the other branches.

[0020] In one possible implementation, each of the branches is provided with the plurality of bonding pads on the two sides adjacent to the strip-shaped main body.

[0021] In one possible implementation, the short side of the strip-shaped main body protrudes beyond the outermost branch.

[0022] In one possible implementation, the short side of the strip-shaped main body is flush with the corresponding side of the outermost branch.

[0023] This disclosure also provides an in-vehicle display device, including:

[0024] The aforementioned display module, and the thin-film encapsulation layer, touch function layer, filter layer and protective cover plate located on the display module. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of one of the COF Bonding schemes in related technologies;

[0026] Figure 2 This is a schematic diagram of one of the structures in the COF Bonding scheme where the PCB and COF bonded position peels.

[0027] Figure 3 This is a schematic diagram of one type of IC Crack structure in the COF Bonding scheme of related technologies;

[0028] Figure 4 This is a schematic diagram of one structure of a flexible circuit board provided in an embodiment of the present disclosure;

[0029] Figure 5 This is a schematic diagram of one structure of a flexible circuit board provided in an embodiment of the present disclosure;

[0030] Figure 6 This is a schematic diagram of one structure of a flexible circuit board provided in an embodiment of the present disclosure;

[0031] Figure 7 This is a schematic diagram of one structure of a flexible circuit board provided in an embodiment of the present disclosure;

[0032] Figure 8 This is a schematic diagram of one structure of a flexible circuit board provided in an embodiment of the present disclosure;

[0033] Figure 9 This is a schematic diagram of one structure of a flexible circuit board provided in an embodiment of the present disclosure;

[0034] Figure 10This is a schematic diagram of one structure of a flexible circuit board provided in an embodiment of the present disclosure;

[0035] Figure 11 This is a schematic diagram of one structure of a flexible circuit board provided in an embodiment of the present disclosure;

[0036] Figure 12 This is a schematic diagram of one structure of a flexible circuit board provided in an embodiment of the present disclosure;

[0037] Figure 13 A schematic diagram of one structure of a printed circuit board provided in an embodiment of this disclosure;

[0038] Figure 14 A schematic diagram of one structure of a printed circuit board provided in an embodiment of this disclosure;

[0039] Figure 15 A schematic diagram of one structure of a printed circuit board provided in an embodiment of this disclosure;

[0040] Figure 16 This is a schematic diagram of one structure of a display module provided in an embodiment of the present disclosure;

[0041] Figure 17 This is a schematic diagram of one structure of a display device provided in an embodiment of the present disclosure;

[0042] Figure 18 This is a schematic diagram of one structure of a display device provided in an embodiment of the present disclosure;

[0043] Figure 19 This is a schematic diagram of one structure of a display device provided in an embodiment of the present disclosure;

[0044] Figure 20 This is a schematic diagram of one structure of a display device provided in an embodiment of the present disclosure;

[0045] Figure 21 This is a schematic diagram of one structure of a display device provided in an embodiment of the present disclosure;

[0046] Figure 22 for Figure 1 The diagram shows the expansion of the corresponding Bonding region in the Bonding scheme.

[0047] Figure 23 for Figure 20 The diagram shows the expansion of the corresponding Bonding region in the Bonding scheme.

[0048] Figure 24 This is a schematic diagram of one structure of an in-vehicle display device provided in an embodiment of the present disclosure. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Furthermore, the embodiments and features in the embodiments of this disclosure can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0050] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains. As used in this disclosure, the words “comprising” or “including” and similar terms mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, but do not exclude other elements or objects.

[0051] It should be noted that the dimensions and shapes of the figures in the accompanying drawings do not reflect actual scale and are intended only to illustrate the content of this disclosure. Furthermore, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0052] In related technologies, automotive displays based on flexible OLEDs can achieve various shapes such as small-radius bends and S-shapes. For example... Figure 1 The diagram shown illustrates one possible structure in which a chip-on-film (COF) film 03 is bonded to a panel 01 and a printed circuit board (PCB) 02, respectively, in the related technology. Figure 2 and Figure 3 The image shows Panel 01 attached to the C-shaped cover glass (CG), forming a C-shape. CG is not shown in the image. Figure 2 To adopt Figure 1 The diagram shown is a frontal structure diagram corresponding to one of the COF Bonding schemes. Figure 3 To adopt Figure 1 The diagram shows one of the reverse side structures corresponding to the COF Bonding scheme. The location where the PCB 02 and COF 03 bond detach (peeling) occurs is shown below. Figure 2 As shown in the dashed box M, the location of the crack on integrated circuit (IC) 04 on COF 03 is as follows. Figure 3(As shown in the dashed box N). Due to factors such as the number of channels, when the rectangular COF 03 bends with Panel 01, the IC 04 on COF 03 and the PCB 02 to which COF 03 is bonded are flat and rigid components and will not bend with COF 03, resulting in IC cracking and PCB bonding defects.

[0053] In view of this, embodiments of the present disclosure provide a display module and an in-vehicle display device to avoid IC breakage and PCB detachment, and to improve the performance of flexible circuit boards and printed circuit boards.

[0054] like Figure 4 The diagram shown illustrates one possible structure of the flexible circuit board in this disclosure embodiment. Specifically, the flexible circuit board provided in this disclosure embodiment includes:

[0055] A first body 10 includes a bendable portion 11 and a flat portion 12 connected to each other, wherein the bendable portion 11 includes a protrusion 110 that protrudes relative to the flat portion 12.

[0056] Multiple output pads 20 are located on the protrusion 110, and the multiple output pads 20 are used for bonding and connecting to the display panel;

[0057] Multiple input pads 30 are located on the side of the flat portion 12 opposite to the flexible portion 11, and the multiple input pads 30 are used for bonding to the printed circuit board.

[0058] Still combined Figure 4 As shown, the first body 10 includes a bendable portion 11 and a flat portion 12 connected to each other. The bendable portion 11 includes a protrusion 110 that protrudes from the flat portion 12. The bendable portion 11 can be bent into a C-shape, S-shape, or other shapes, while the flat portion 12 remains straight during bending. In a specific implementation, the bendable portion 11 and the flat portion 12 can form an L-shaped first body 10, and correspondingly, the flexible circuit board has an L-shaped design.

[0059] Still combined Figure 4 As shown, the flexible circuit board also includes multiple output pads 20 located on the protrusion 110, which are used for bonding and connecting to the display panel. In other words, the flexible circuit board can be bonded and connected to the display panel via the multiple output pads 20. In this way, the flexible circuit board can output control signals related to the display function to the display panel via the multiple output pads 20, thereby ensuring the performance of the flexible circuit board. Furthermore, the specific number of output pads 20 can be set according to actual application needs, and is not limited here.

[0060] The flexible circuit board also includes multiple input pads 30 located on the side of the flat portion 12 facing away from the flexible portion 11. These input pads 30 are used for bonding and connecting to the printed circuit board. In other words, the flexible circuit board and the printed circuit board can be bonded together via the multiple input pads 30. This allows the printed circuit board to output relevant signals to the flexible circuit board via the multiple input pads 30, thereby ensuring the performance of the flexible circuit board. Furthermore, the specific number of input pads 30 can be set according to actual application needs and is not limited here.

[0061] Because the first body 10 of the flexible circuit board provided in this embodiment not only includes a protrusion 110 that protrudes from the flat portion 12 in the bendable portion 11, but also the flat portion 12 remains straight during the bending process of the bendable portion 11, compared with flexible circuit boards in related technologies, after the flexible circuit board is subsequently bonded to the display panel and the printed circuit board respectively, during the bending of the display panel, not only can breakage caused by bending of the flexible circuit board be avoided, but also poor bonding caused by pulling at the bonding position between the flexible circuit board and the printed circuit board can be avoided, thereby improving the performance of the flexible circuit board.

[0062] In this embodiment of the disclosure, each of the output pads 20 extends along a first direction and is arranged sequentially along a second direction intersecting the first direction, and each of the input pads 30 extends along a third direction and is arranged sequentially along a fourth direction intersecting the third direction. The first direction and the fourth direction are substantially the same, and the second direction and the third direction are substantially the same.

[0063] In one exemplary embodiment, such as Figure 5 As shown, to ensure the signal input and output functions of the flexible circuit board and improve the bonding performance between the flexible circuit board and the display panel and the printed circuit board, the multiple output pads 20 extend along a first direction and are arranged sequentially along a second direction intersecting the first direction. The multiple input pads 30 extend along a third direction and are arranged sequentially along a fourth direction intersecting the third direction. The first and fourth directions are approximately the same, and the second and third directions are approximately the same. Wherein, the direction indicated by arrow x is the first direction, the direction indicated by arrow y is the second direction, the direction indicated by arrow y' is the third direction, and the direction indicated by arrow x' is the fourth direction. It should be noted that in this embodiment, "approximately the same" can mean completely identical or approximately identical. Figure 5 The diagram illustrates the case where the first direction is exactly the same as the fourth direction, and the second direction is exactly the same as the third direction.

[0064] In this embodiment of the disclosure, the flat portion 12 in the flexible circuit board can be configured in several ways, but is not limited to these few ways. In one exemplary embodiment, as... Figure 6 As shown, the flat portion 12 includes a first side 121 adjacent to the protrusion 110, a second side 122 opposite to the first side 121, and a third side 123 away from the bendable portion 11. The first side 121 and the second side 122 both extend along the second direction, and the first side 121 is longer than the second side 122. The third side 123 is inclined at a predetermined angle relative to the first direction.

[0065] Still combined Figure 6 As shown, the flat portion 12 includes a first side 121 adjacent to the protrusion 110, a second side 122 opposite to the first side 121, and a third side 123 away from the bendable portion 11. Both the first side 121 and the second side 122 extend along a second direction, with the first side 121 longer than the second side 122. The third side 123 is inclined at a predetermined angle relative to the first direction. Figure 6 As shown, the preset angle is α. Of course, those skilled in the art can preset the specific value of the preset angle of inclination of the third side 123 relative to the first direction according to the actual application needs, which is not limited here.

[0066] In one exemplary embodiment, such as Figure 7 As shown, the fourth direction is approximately the same as the extension direction of the third side 123.

[0067] In this embodiment of the disclosure, the flexible circuit board can be COF, such as... Figures 8 to 10 As shown, the flexible circuit board also includes a driver chip 40 located in the flat portion 12, and the driver chip 40 is located on the side of the plurality of input pads 30 near the flexible portion 11.

[0068] Still combined Figures 8 to 10 As shown, the flexible circuit board also includes a driver chip 40 located in the flat portion 12. The driver chip 40 is used to load control signals related to the display function, such as clock signals, frame start signals, high-level signals, and low-level signals, onto the display panel bonded to the multiple output pads 20 via multiple output pads 20. In addition, the driver chip 40 is located on the side of the multiple input pads 30 near the flexible portion 11, and the spatial distribution between the multiple input pads 30 and the driver chip 40 does not interfere with each other.

[0069] Combination Figure 8 and Figure 9As shown, in one exemplary embodiment, the driving chip 40 extends substantially along the first direction. This improves the space utilization of the flat portion 12.

[0070] Combination Figure 10 As shown, in one exemplary embodiment, the extending direction of the driver chip 40 is substantially the same as the extending direction of the third side 123 of the flat portion 12 away from the flexible portion 11. This improves the problem of uneven trace resistance in the flexible circuit board and enhances its performance. Of course, besides the aforementioned method of configuring the driver chip 40, other methods based on the present disclosure can be used, and no limitation is made here.

[0071] In this embodiment of the disclosure, the flexible circuit board further includes multiple signal traces 50, each of which is electrically connected to the driver chip 40 and the corresponding output pad 20, and the lengths of each signal trace 50 are approximately the same.

[0072] In practical implementation, the flexible circuit board also includes multiple signal traces 50. The specific number of signal traces 50 can be set according to actual application needs, and is not limited here. Each signal trace 50 is electrically connected to the driver chip 40 and the corresponding output pad 20 among the multiple output pads 20. The lengths of each signal trace 50 are approximately the same. In this way, by adjusting the length of each signal trace 50, the lengths of each signal trace 50 can be adjusted to be approximately the same, ensuring that the resistance of each signal trace 50 is approximately the same. After the flexible circuit board is bonded to the display panel through the multiple output pads 20, the display uniformity of the display panel is ensured, and the display effect of the display panel is improved. In addition, the flexible circuit board also includes multiple traces that are electrically connected to the driver chip 40 and multiple input pads 30 respectively. Each trace is arranged in a straight line and is directly connected to the corresponding input pad 30. The multiple traces can be distributed in a fan shape, thereby ensuring that relevant signals can be loaded to the driver chip 40 through each input pad 30, thus ensuring the performance of the flexible circuit board.

[0073] In one exemplary embodiment, combined with Figure 11 As shown, the signal traces 50 electrically connected to the output pads 20 closest to the driver chip 40 among the plurality of output pads 20 are designed with curves, while the signal traces 50 electrically connected to the output pads 20 away from the driver chip 40 among the plurality of output pads 20 are designed with straight lines.

[0074] In this embodiment of the disclosure, the signal traces 50 electrically connected to the output pads 20 closest to the driver chip 40 among the plurality of output pads 20 have a shape in the orthographic projection on the flexible circuit board including at least one of a single triangle, a triangular zigzag, a single rectangle, a rectangular zigzag, and an arc.

[0075] Still combined Figure 11 As shown, the signal traces 50 electrically connected to the output pads 20 closest to the driver chip 40 among the multiple output pads 20 have a rectangular sawtooth shape projected onto the flexible circuit board. Figure 11 The configuration of all signal traces 60 is not shown in the diagram. Each signal trace 60 can be configured using the same publicly available concept, and will not be detailed here. The signal traces 50 electrically connected to the output pads 20 opposite to the driver chip 40 among the multiple output pads 20 are designed in a straight line to ensure that the length of each signal trace 50 is approximately the same, thereby guaranteeing the uniformity of the resistance of each signal trace 50 and improving the performance of the flexible circuit board.

[0076] In one exemplary embodiment, such as Figure 11 As shown, the signal traces 50 electrically connected to the output pads 20 away from the driver chip 40 among the multiple output pads 20 are designed in a straight line. The signal traces 50 electrically connected to the output pads 20 close to the driver chip 40 among the multiple output pads 20 have a rectangular sawtooth shape projected on the flexible circuit board, and include multiple rectangular repeating units of the same size. If each rectangular repeating unit is distributed at an equal density on the corresponding signal trace 50, then along the first direction and in the direction away from the driver chip 40, the number of rectangular repeating units on the multiple signal traces 50 shows a decreasing trend. Figure 11 Each signal trace 60 can be configured using the same design, which will not be detailed here. This ensures the uniformity of resistance among all signal traces 50, thereby improving the performance of the flexible circuit board.

[0077] In one exemplary embodiment, such as Figure 12 As shown, among the multiple signal traces 50 electrically connected to the driver chip 40 via multiple output pads 20, each signal trace 50 includes a first portion 501 extending along a first direction and a second portion 502 extending along a second direction. In specific implementations, the curved signal trace 50 includes at least one curved unit. This at least one curved unit may be provided only in the first portion 501, only in the second portion 502, or both in the first portion 501 and the second portion 502. Of course, the configuration of each signal trace 50 can also be tailored to the bending performance of the flexible circuit board, and is not limited here.

[0078] It should be noted that, Figure 11 and Figure 12 The diagram only shows the configuration of some of the signal traces 50. Of course, the same design concept can be used to configure the signal traces 50 between each output pad 20 and the driver chip 40, but this will not be described in detail here.

[0079] In the flexible circuit board provided in this embodiment, the flexible circuit board further includes a bendable area B. The bendable area B is located on the side of the plurality of output pads 20 near the bendable portion 11. After being bonded to the display panel through the plurality of output pads 20, the portion of the bendable area B on the side of the flexible circuit board away from the plurality of output pads 20 can be bent along the bendable area B to the back of the display panel, thereby ensuring the narrow bezel design of the display panel. In addition, still in conjunction with Figure 11 As shown, the portion of each signal trace 50 located in the bendable area B is designed as a straight line, avoiding breakage of the signal trace 50 and improving the performance of the display panel. Of course, the flexible circuit board in this embodiment may include not only the structures mentioned above, but also other structures according to actual application needs. These other structures can be set with reference to relevant technologies and will not be detailed here.

[0080] Based on the same publicly disclosed concept, such as Figure 13 As shown in the embodiments of this disclosure, a printed circuit board is also provided, comprising:

[0081] The second body 60 includes a strip-shaped main body 601 and at least one branch 602 connected to the long side of the strip-shaped main body 601; wherein, the at least one branch 602 may be one or more, which is not limited here.

[0082] Multiple bonding pads 70 are located on at least one side of each branch 602 adjacent to the strip body portion 601. The multiple bonding pads 70 extend along a third direction and are arranged sequentially along a fourth direction intersecting the third direction. The multiple bonding pads 70 are used to bond with the multiple input pads 30 of the flexible circuit board as described in any of the above.

[0083] Still combined Figure 13As shown, the printed circuit board provided in this embodiment includes a second body 60, which includes a strip-shaped main body 601 and at least one branch 602 connected to the long side of the strip-shaped main body 601. The specific number of the at least one branch 602 can be set according to actual application needs and is not limited here. The printed circuit board also includes at least one side adjacent to each branch 602 and the strip-shaped main body 601, wherein there are two adjacent sides between each branch 602 and the strip-shaped main body 601. In specific implementation, multiple pads may be provided on one side adjacent to the branch 602 and the strip-shaped main body 601, or multiple pads may be provided on both sides connected to the branch 602 and the strip-shaped main body 601, which can be set according to actual application and is not limited here. Multiple bonding pads 70 extend along a third direction and are arranged sequentially along a fourth direction intersecting the third direction, wherein the direction indicated by arrow y' represents the third direction and the direction indicated by arrow x' represents the fourth direction. In practice, multiple bonding pads 70 are used to bond multiple input pads 30 of the flexible circuit board as described above.

[0084] In this embodiment of the disclosure, the printed circuit board can be configured in several ways, but is not limited to these few ways. In one exemplary embodiment, it is still combined with... Figure 13 As shown, in the at least one branch 602, the two branch 602 located at the edge are provided with the plurality of bonding pads 70 only on one side adjacent to the short side of the strip body 601, while the other branch 602 are provided with the plurality of bonding pads 70 on both sides adjacent to the strip body 601.

[0085] Still combined Figure 13 As shown, in at least one branch 602, the two branch 602 located at the edge are provided with multiple bonding pads 70 on only one side adjacent to the short side of the strip body 601. In the other branch 602 of at least one branch 602, multiple bonding pads 70 are provided on both sides adjacent to the short side of the strip body 601. In specific implementation, each branch 602 is symmetrically arranged with respect to the center line of the strip body 601. Correspondingly, the multiple bonding pads 70 are symmetrically arranged with respect to the center line of the strip, thereby ensuring the structural stability of the printed circuit board.

[0086] In the embodiments disclosed herein, such as Figure 14 and Figure 15 As shown, each of the branch portions 602 has the plurality of bonding pads 70 provided on the two sides adjacent to the strip-shaped main body portion 601. When the printed circuit board is subsequently bonded to the flexible circuit board via the plurality of bonding pads 70, the uniformity of force on each branch portion 602 of the printed circuit board is ensured, improving the performance of the printed circuit board.

[0087] In one exemplary embodiment, such as Figure 14 As shown, the short side of the strip-shaped main body 601 protrudes beyond the outermost branch 602.

[0088] In one exemplary embodiment, such as Figure 15 As shown, the short side of the strip-shaped main body 601 is flush with the corresponding side of the outermost branch 602. Compared to Figure 14 In terms of configuration, the long side of the printed circuit board can be made shorter, ensuring a thinner and lighter design for the printed circuit board.

[0089] Based on the same publicly disclosed concept, such as Figure 16 As shown in the embodiments of this disclosure, a display module is also provided, including:

[0090] Display panel 100, at least one flexible circuit board 200 and at least one printed circuit board 300;

[0091] The display panel 100 includes multiple connection pads located in the bonding area. Figure 16 (Not shown in the diagram); at least one flexible circuit board 200 may be one or more, without limitation; at least one printed circuit board 300 may be one or more, without limitation. Figure 16 The diagram illustrates a display module comprising four flexible circuit boards 200 and one printed circuit board 300. Of course, the number of at least one flexible circuit board 200 and at least one printed circuit board 300 in the display module can be set according to actual application needs, and no limitation is made here.

[0092] The flexible circuit board 200 includes a first body 10, a plurality of output pads 20 and a plurality of input pads 30. The first body 10 includes a bendable portion 11 and a flat portion 12 connected to each other. The bendable portion 11 includes a protrusion 110 that protrudes relative to the flat portion 12. The plurality of output pads 20 are located on the protrusion 110 and are bonded to the plurality of connection pads. The plurality of input pads 30 are located on the side of the flat portion 12 opposite to the bendable portion 11.

[0093] The printed circuit board 300 includes a second body 60 and a plurality of bonding pads 70. The second body 60 includes a strip-shaped main body 601 and at least one branch 602 connected to the long side of the strip-shaped main body 601. The plurality of bonding pads 70 are located on at least one side of each branch 602 adjacent to the strip-shaped main body 601, and the plurality of bonding pads 70 are bonded to the plurality of input pads 30.

[0094] Taking a display module comprising four flexible circuit boards 200 and one printed circuit board 300 as an example, still combined with Figure 16 As shown, the flexible circuit board 200 can be adopted Figure 8 The structure shown indicates that the printed circuit board 300 can be adopted. Figure 13 In the structure shown, the flexible circuit board 200 and the printed circuit board 300 are electrically connected via multiple input pads 30 and multiple bonding pads 70. This allows the printed circuit board 300 to output relevant signals to the printed circuit board via the bonding pads 70 and input pads 30. Furthermore, the flexible circuit board 200 and the display panel 100 are electrically connected via multiple output pads 20 and multiple connection pads. This allows the flexible circuit board 200 to output control signals related to display functions to the display substrate via the output pads 20 and multiple connection pads, thereby ensuring the performance of the display device.

[0095] It should be noted that the display module provided in this embodiment is not limited to the case of including four flexible circuit boards 200, but may also include other numbers of flexible circuit boards 200. The number of flexible circuit boards 200 can be set according to the actual application needs, and is not limited here.

[0096] In the display module provided in this embodiment, the flexible circuit board 200 adopts... Figure 16 The non-flat design (irregular design) shown ensures that the flat portion 12 remains flat during the subsequent bending of the flexible circuit board 200's bendable portion 11. This not only prevents breakage caused by bending of the flexible circuit board 200, but also avoids poor bonding caused by pulling between the flexible circuit board 200 and the printed circuit board at the bonding position, thus ensuring the performance of the display device.

[0097] Combination Figure 16 as well as Figures 5 to 12 As shown, each of the output pads 20 extends along a first direction and is arranged sequentially along a second direction intersecting the first direction, and each of the input pads 30 extends along a third direction and is arranged sequentially along a fourth direction intersecting the third direction. The first direction and the fourth direction are substantially the same, and the second direction and the third direction are substantially the same.

[0098] In the embodiments disclosed herein, such as Figure 17 The diagram shown is a schematic of one type of display module structure. Figure 17 In the process, flexible circuit board 200 can be adopted Figure 9 The structure shown indicates that the printed circuit board 300 can be adopted. Figure 13In a similar structure, in the flexible circuit board 200, the flat portion 12 includes a first side 121 adjacent to the protrusion 110, a second side 122 opposite to the first side 121, and a third side 123 away from the flexible portion 11. Both the first side 121 and the second side 122 extend along the second direction, with the first side 121 being longer than the second side 122. The third side 123 is inclined at a predetermined angle relative to the first direction. The predetermined angle can be as follows: Figure 9 As shown in α.

[0099] In one exemplary embodiment, such as Figure 18 The diagram shown is a schematic of one type of display module structure. Figure 18 In the process, flexible circuit board 200 can be adopted Figure 10 The structure shown indicates that the printed circuit board 300 can be adopted. Figure 13 A similar structure, wherein the fourth direction is approximately the same as the extending direction of the third side 123.

[0100] In the embodiments disclosed herein, such as Figures 16 to 18 As shown, the flexible circuit board 200 also includes a driver chip 40 located in the flat portion 12. The driver chip 40 is located on the side of the plurality of input pads 30 near the bendable portion 11. The driver chip 40 can be referenced from... Figures 8 to 10 The settings will be configured, but will not be detailed here.

[0101] In one exemplary embodiment, still combined Figure 8 and Figure 9 As shown, the driver chip 40 extends generally along the first direction.

[0102] In one exemplary embodiment, such as Figure 10 As shown, the extending direction of the driving chip 40 is approximately the same as the extending direction of the third side 123 of the flat portion 12 away from the flexible portion 11.

[0103] In this embodiment of the disclosure, the flexible circuit board 200 further includes multiple signal traces 50, each of which is electrically connected to the driver chip 40 and the corresponding output pad 20, and the lengths of each signal trace 50 are approximately the same.

[0104] In this embodiment of the disclosure, the signal traces 50 electrically connected to the output pads 20 closest to the driver chip 40 among the plurality of output pads 20 are designed with curves, while the signal traces 50 electrically connected to the output pads 20 away from the driver chip 40 among the plurality of output pads 20 are designed with straight lines.

[0105] In the disclosed embodiments, the signal traces 50 electrically connected to the output pads 20 closest to the driver chip 40 among the plurality of output pads 20, have a shape whose orthographic projection on the flexible circuit board includes at least one of a single triangle, a triangular zigzag shape, a single rectangle, a rectangular zigzag shape, and an arc shape. In one exemplary embodiment, the signal trace 50 may be a reference... Figure 11 or Figure 12 The settings are shown below and will not be detailed here. Of course, the signal routing width can be set according to the actual application requirements, and there are no restrictions here.

[0106] In this embodiment of the disclosure, the plurality of bonding pads 70 in the printed circuit board 300 extend along the third direction and are arranged sequentially along a fourth direction intersecting the third direction. Specific design details can be found in [reference needed]. Figure 13 The details mentioned above will not be elaborated here.

[0107] In this disclosed embodiment, it is still combined with Figure 16 As shown, in the at least one branch 602, the two branch 602 located at the edge are provided with the plurality of bonding pads 70 only on one side adjacent to the short side of the strip body 601, while the other branch 602 are provided with the plurality of bonding pads 70 on both sides adjacent to the strip body 601.

[0108] In the embodiments disclosed herein, such as Figure 19 and Figure 20 As shown, each of the branch portions 602 is provided with the plurality of bonding pads 70 on the two sides adjacent to the strip-shaped main body portion 601.

[0109] Still combined Figure 19 As shown, the short side of the strip-shaped main body 601 protrudes beyond the outermost branch 602.

[0110] Still combined Figure 20 As shown, the short side of the strip-shaped main body 601 is flush with the corresponding side of the outermost branch 602.

[0111] In the specific implementation process, the principle of the problem solved by the display module is similar to that of the aforementioned flexible circuit board 200 and printed circuit board 300. Therefore, the implementation of this display module can refer to the implementation of the aforementioned flexible circuit board 200 and printed circuit board 300, and the repeated parts will not be repeated.

[0112] Based on the aforementioned structure of the flexible circuit board 200 and the corresponding printed circuit board 300, the irregularly shaped flexible circuit board 200 and the irregularly shaped printed circuit board 300 can be combined in various ways in the display module. In specific implementation, the flexible circuit board 200 and the printed circuit board 300 can be configured according to the number of flexible circuit boards 200 and other design requirements. The number of flexible circuit boards 200 is related to the screen resolution. For example, using a resolution of 2560*1600 and true RGB pixel arrangement, the specific value range of the number of flexible circuit boards 200, n, is: n = 2560*3 / 1920 = 4, where the number of channels is 1920. Of course, the number of flexible circuit boards 200 can also be set according to actual application needs, and this is not limited here. In specific implementation, the display module can have the following configuration methods, but is not limited to these methods. The display device can be configured according to actual application needs, and this is not limited here.

[0113] In one exemplary embodiment, such as Figures 16 to 18 As shown, in the printed circuit board 300, the two branches 602 located at the edge are provided with multiple bonding pads 70 on only one side adjacent to the short side of the strip body 601. In at least one branch 602, the other branches 602 are provided with multiple bonding pads 70 on both sides adjacent to the strip body 601. Each flexible circuit board 200 is symmetrically distributed relative to the center line of the printed circuit board 300.

[0114] In one exemplary embodiment, such as Figure 19 As shown, each branch 602 in the printed circuit board 300 has multiple bonding pads 70 on the two sides adjacent to the strip-shaped main body 601, and the short side of the strip-shaped main body 601 protrudes from the outermost branch 602. Each flexible circuit board 200 is symmetrically distributed relative to the center line of the printed circuit board 300.

[0115] In one exemplary embodiment, such as Figure 20 As shown, each branch 602 in the printed circuit board 300 has multiple bonding pads 70 on the two sides adjacent to the strip-shaped main body 601. The short side of the strip-shaped main body 601 is flush with the corresponding side of the outermost branch 602. Each flexible circuit board 200 is symmetrically distributed relative to the center line of the printed circuit board 300.

[0116] It should be noted that, in the specific implementation process, in addition to using the aforementioned methods to set the positional relationship between the display panel 100, the flexible circuit board 200, and the printed circuit board 300 in the display module, other methods can also be used to set the display module according to the inventive concept of this disclosure, which will not be detailed here.

[0117] In one exemplary embodiment, combined with Figure 21 As shown, the parameters related to the flexible circuit board 200, printed circuit board 300, and display panel 100 in the display module can be set according to the following rules. Wherein, 'a' represents the extension length of the third side 123 of the flat portion 12 along the fourth direction, and the specific value range of the extension length depends on the number of multiple input pads 30 and the pitch between two adjacent pads; 'b' represents the length of the branch portion 602 extending beyond the flat portion 12 along the fourth direction, and the corresponding value range can be b≥3.5mm; 'c' represents the extension length of the branch portion 602 along the fourth direction, and the corresponding value range can be c≥(a+2b); 'd' represents the distance from the branch portion 602 to the bendable area B, and the corresponding value range can be d≥(0.06*(Bonding tolerance of printed circuit board 300)+0.15*... (The external tolerance of the printed circuit board 300) + 0.5 * (the bending tolerance of the flexible circuit board 200)), in one exemplary embodiment, d can be 0.7 mm; e represents the width of the bendable area B, and the corresponding value range depends on the bending radius; f represents the bonding width of the plurality of output pads 20 along the second direction, and the corresponding value range can be satisfied by (1.5 * (bonding width) + 0.5 * (adhesive width) = 2 * (adjusted according to specific projects)); g represents the extension length of the flexible circuit board 200 along the first direction, and the corresponding value range satisfies (g = a + b + d + e + f); l represents the display area (Active) of the display panel 100. Area (AA) extends along the second direction, and the corresponding value range can satisfy (l≥i*n+h*(n-1)+7.06*(distance from flexible circuit board 200 to area AA)); k represents the extension length of the strip-shaped main body 601 along the third direction, and the corresponding value range can satisfy (k=l-7.06*2-i*2-j*2+m*2). In this embodiment, the value corresponding to k is much smaller than Figure 1In traditional solutions, the minimum PCB length is (e.g., (l-7.06*2+3.5*2)). Correspondingly, in this embodiment, a smaller printed circuit board 300 can be used. h represents the distance between the bendable portions 11 of two adjacent flexible circuit boards 200, with a value range satisfying the specification value ≥17.024mm. i represents the extension length of the multiple output pads 20 along the second direction, with a value range depending on the number of output pads 20 and the pitch between adjacent output pads 20. j represents the extension length of the flat portion 12 along the second direction, with a value range satisfying (j≥m+0.5*(adhesive width)+length of the driver chip 40 along the first direction+crimping requirement width). m represents the extension length of the multiple input pads 30 of the flexible circuit board 200 along a third direction. Of course, the relevant values ​​of am can be set according to actual application needs, and are not limited here.

[0118] In this embodiment, the flexible circuit board 200 and the printed circuit board 300 are heated during bonding to activate the anisotropic conductive film (ACF). When heated, the flexible circuit board 200 and the printed circuit board 300 expand. Since the flexible circuit board 200 and the printed circuit board 300 are made of different materials, their coefficients of expansion are different, and the amount of expansion is also different. Therefore, it is usually necessary to pre-shrink the flexible circuit board 200 and the printed circuit board 300 by different values ​​to improve the bonding yield. Figure 1 The Bonding scheme shown in the diagram has the corresponding Bonding region expansion diagram as follows: Figure 22 As shown, the small arrows indicate the expansion direction of the flexible circuit board, and the large arrows indicate the expansion direction of the printed circuit board. When four flexible circuit boards are bonded to the printed circuit board at the same time, the printed circuit board expands as a whole when heated, while each flexible circuit board expands on its own. This can easily lead to insufficient contact area between the corresponding pads (pins) of the flexible circuit boards and the printed circuit board, resulting in poor bonding.

[0119] In adopting the embodiments of this disclosure Figure 20 When the Bonding scheme is shown, the corresponding Bonding region expansion diagram is as follows: Figure 23 As shown, the small arrow indicates the expansion direction of the flexible circuit board 200, and the large arrow indicates the expansion direction of the printed circuit board 300. The flexible circuit board 200 and the printed circuit board 300 expand synchronously. Figure 22 Under the same bonding accuracy and pitch, the pin contact area is relatively stable, and the bonding yield is relatively high.

[0120] Based on the same publicly disclosed concept, such as Figure 24 As shown in the figure, this disclosure also provides an in-vehicle display device, which includes:

[0121] The display module 1000 as described above, and the thin film encapsulation layer 2000, touch function layer 3000, filter layer 4000 and protective cover plate 5000 located on the display module 1000.

[0122] In practical implementation, the principle by which the vehicle-mounted display device solves the problem is similar to that of the aforementioned flexible circuit board 200 and printed circuit board 300, and the repetitions will not be repeated. In one application scenario, the display module 1000 can be non-rectangular, such as C-shaped or S-shaped. Correspondingly, the vehicle-mounted display device is C-shaped or S-shaped, and can be applied to a vehicle, which can be a motor vehicle or a non-motor vehicle. For example, when applied to a motor vehicle, the vehicle-mounted display device can be placed in the position of a navigation system and function as a navigation system, or it can be placed in the position of the front-view mirror, or it can be placed within the passenger's line of sight. Of course, the specific location and function of the vehicle-mounted display device can be set according to the actual application needs, and no limitations are imposed here.

[0123] In practical implementation, the thin-film encapsulation layer 2000 is used to encapsulate the display module 1000 to prevent water and oxygen corrosion, thus avoiding water and oxygen entering the display module 1000 and causing it to fail. The thin-film encapsulation layer 2000 may include a first inorganic layer, a second inorganic layer, and an organic layer located between the first and second inorganic layers. The material of the first inorganic layer may be at least one of silicon oxide, silicon nitride, and silicon oxynitride, and the material of the second inorganic layer may also be at least one of silicon oxide, silicon nitride, and silicon oxynitride. Of course, the thin-film encapsulation layer 2000 may also include more film layers with alternating inorganic and organic layers; this is not limited here.

[0124] In the specific implementation process, the vehicle display device also includes a touch function layer 3000 (Flexible Multi-Layer On Cell, FMLOC) located on the thin film encapsulation layer 2000. Accordingly, each film layer of the touch function layer 3000 can be directly fabricated on the thin film encapsulation layer 2000. Accordingly, the touch function layer 3000 is set in the film layer structure, so there is no need to set up a separate touch substrate. Thus, while ensuring the thin and light design of the vehicle display device, the touch function of the vehicle display device is guaranteed.

[0125] In practical implementation, the vehicle display device also includes a filter layer 4000 located on the touch function layer 3000. The filter layer 4000 can be a polarizer or a color filter. Polarizers are generally thicker. When the filter layer 4000 uses a color filter, a color filter on encapsulation (COE) technology is used to ensure the thin and light design of the vehicle display device.

[0126] In practical implementation, the vehicle-mounted display device also includes a protective cover 5000 located on the filter layer 4000. The protective cover 5000 not only protects the display module from damage, but also enhances the performance of the vehicle-mounted display device by applying a functional coating to the protective cover 5000. This coating may include one or more of the following: AG (anti-glare) protective film, AF (anti-fingerprint) protective film, and UV (anti-ultraviolet) protective film; no specific limitations are specified herein.

[0127] In the specific implementation process, other essential components of the vehicle-mounted display device are all those that should be understood by those skilled in the art, and will not be described in detail here, nor should they be construed as limiting this disclosure.

[0128] Although preferred embodiments of this disclosure have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this disclosure.

[0129] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include such modifications and variations.

Claims

1. A display module, wherein, include: Display panel, at least one flexible circuit board, and at least one printed circuit board; The display panel includes multiple connection pads located in the bonding area; The flexible circuit board includes a first body, a plurality of output pads, and a plurality of input pads. The first body includes a bendable portion and a flat portion connected to each other. The bendable portion includes a protrusion that protrudes from the flat portion. The plurality of output pads are located on the protrusion and are bonded to the plurality of connection pads. The plurality of input pads are located on the side of the flat portion away from the bendable portion. The flexible circuit board also includes a driver chip located on the flat portion. The driver chip is located on the side of the plurality of input pads closer to the bendable portion. The printed circuit board includes a second body and a plurality of bonding pads. The second body includes a strip-shaped main body portion and at least one branch portion connected to the long side of the strip-shaped main body portion. The plurality of bonding pads are located on at least one side of each branch portion adjacent to the strip-shaped main body portion, and the plurality of bonding pads are bonded to the plurality of input pads.

2. The display module as described in claim 1, wherein, Each of the output pads extends along a first direction and is arranged sequentially along a second direction intersecting the first direction. Each of the input pads extends along a third direction and is arranged sequentially along a fourth direction intersecting the third direction. The first direction and the fourth direction are substantially the same, and the second direction and the third direction are substantially the same.

3. The display module as described in claim 2, wherein, The flat portion includes a first side adjacent to the protrusion, a second side opposite to the first side, and a third side away from the bendable portion. The first side and the second side both extend along the second direction, and the first side is longer than the second side. The third side is inclined at a predetermined angle relative to the first direction.

4. The display module as described in claim 3, wherein, The fourth direction is approximately the same as the extension direction of the third side.

5. The display module as described in claim 2, wherein, The driver chip extends generally along the first direction.

6. The display module as described in claim 2, wherein, The extension direction of the driver chip is approximately the same as the extension direction of the third side of the flat portion away from the flexible portion.

7. The display module as described in any one of claims 2-6, wherein, The flexible circuit board also includes multiple signal traces, each of which is electrically connected to the driver chip and the corresponding output pad, and the length of each signal trace is approximately the same.

8. The display module as described in claim 7, wherein, The signal traces electrically connected to the output pads closest to the driver chip among the plurality of output pads are designed with curves, while the signal traces electrically connected to the output pads away from the driver chip among the plurality of output pads are designed with straight lines.

9. The display module as described in claim 8, wherein, The signal traces electrically connected to the output pads closest to the driver chip among the plurality of output pads have a shape in the orthographic projection on the flexible circuit board that includes at least one of a single triangle, a triangular zigzag, a single rectangle, a rectangular zigzag, and an arc.

10. The display module according to any one of claims 2-6, 8, and 9, wherein, The plurality of bonding pads extend along the third direction and are arranged sequentially along a fourth direction intersecting the third direction.

11. The display module as claimed in claim 10, wherein, Of the at least one branch, the two branches located at the edge are provided with the plurality of bonding pads only on one side adjacent to the short side of the strip body, while the other branches are provided with the plurality of bonding pads on both sides adjacent to the strip body.

12. The display module as claimed in claim 10, wherein, Each of the branch portions is provided with the plurality of bonding pads on the two sides adjacent to the strip-shaped main body portion.

13. The display module as described in claim 11 or 12, wherein, The short side of the strip-shaped main body protrudes from the outermost branch.

14. The display module as described in claim 11 or 12, wherein, The short side of the strip-shaped main body is flush with the corresponding side of the outermost branch.

15. A vehicle-mounted display device, wherein, The vehicle-mounted display device includes: The display module as described in any one of claims 1-14, and the thin film encapsulation layer, touch function layer, filter layer and protective cover plate located on the display module.

Images