Electric connection structure, display panel and display device

Abstract

Embodiments of the present application provide an electric connection structure, a display panel and a display device. The electric connection structure comprises: a flexible circuit board, a first chip on film and a second chip on film; one end of the flexible circuit board is used for electrically connecting with a circuit board; the other end of the flexible circuit board is clamped between one end of the first chip on film and one end of the second chip on film; one end of the first chip on film is electrically connected with one side of the other end of the flexible circuit board; one end of the second chip on film is electrically connected with the other side of the other end of the flexible circuit board; the other end of the first chip on film and the other end of the second chip on film are respectively used for electrically connecting with a display panel. At least two chip on films are adopted to realize double-side bonding with the flexible circuit board, so that the width of the flexible circuit board can be effectively reduced, the space occupation ratio of the flexible circuit board to the display product is reduced, and the compact layout of the display product is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular, the present application relates to an electrical connection structure, a display panel and a display device. BACKGROUND

[0002] In order to meet the increasingly high visual needs of consumers, display products are developing towards high resolution or large size.

[0003] The existing display products usually use FPC (flexible circuit board) to realize the transmission of control signals between the circuit board and the display panel. In high resolution display products or large size display products, due to the large increase in signal lines, the width of the flexible circuit board is large, which will occupy a large product space, and is not conducive to the compact layout of the display product.

[0004] In addition, in the case of excessive width of the flexible circuit board, the existing electrical connection process cannot meet the design specification shrinkage, which will reduce the electrical connection yield between the flexible circuit board and the display panel. SUMMARY

[0005] The present application aims at the shortcomings of the prior art, and provides an electrical connection structure, a display panel and a display device to solve the technical problems that the width of the flexible circuit board is large in high resolution display products or large size display products, which is not conducive to the compact layout of the display product, or the electrical connection yield of the flexible circuit board is reduced.

[0006] In a first aspect, the embodiments of the present application provide an electrical connection structure, comprising: a flexible circuit board, a first COF and a second COF;

[0007] One end of the flexible circuit board is used for electrical connection with a circuit board;

[0008] The other end of the flexible circuit board is clamped between one end of the first COF and one end of the second COF;

[0009] One end of the first COF is electrically connected with one side of the other end of the flexible circuit board; one end of the second COF is electrically connected with the other side of the other end of the flexible circuit board;

[0010] The other end of the first COF and the other end of the second COF are respectively used for electrical connection with a display panel.

[0011] In a second aspect, the embodiments of the present application provide a display panel, comprising: a pin area;

[0012] The pin area is used for electrical connection with the other end of the first COF and the other end of the second COF of the electrical connection structure provided in the first aspect.

[0013] In a third aspect, an embodiment of the present application provides a display device, comprising the electric connection structure provided in the first aspect above.

[0014] Or, comprising the electric connection structure provided in the first aspect above, the display panel provided in the second aspect above, and the circuit board; one end of the flexible circuit board of the electric connection structure is electrically connected with the circuit board, and the other end of the first COF and the other end of the second COF are respectively electrically connected with the display panel.

[0015] The technical scheme provided by the embodiment of the present application has the beneficial technical effects including: at least two COFs are used to transmit signals between the flexible circuit board and the display panel, the bonding area is designed on at least two surfaces of the flexible circuit board, the at least two COFs are respectively electrically connected with the bonding area on the two surfaces of the flexible circuit board, double-sided bonding is achieved, so that the width of the flexible circuit board can be effectively reduced, the space occupation ratio of the flexible circuit board to the display product is reduced, and the compact layout of the display product is facilitated.

[0016] In addition, the width of the flexible circuit board is reduced, and the width of the COF is also small, which is conducive to improving the yield of the electrical connection between the COF and the flexible circuit board, and is also conducive to improving the yield of the electrical connection between the COF and the display panel, thereby improving the yield of the electrical connection between the flexible circuit board and the display panel.

[0017] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A structural schematic diagram of an electric connection structure provided by an embodiment of the present application is shown in the figure;

[0020] Figure 2 A structural schematic diagram of an electric connection structure provided by an embodiment of the present application is shown in the figure; Figure 1 A cross-sectional structural schematic diagram of the A-A surface in the figure is shown in the figure;

[0021] Figure 3 A structural schematic diagram of a display device provided by an embodiment of the present application is shown in the figure;

[0022] Figure 4 A structural schematic diagram of another display device provided by an embodiment of the present application is shown in the figure.

[0023] In the figure:

[0024] 100 - electrical connection structure; 110 - flexible circuit board; 120 - first COF; 130 - second COF;

[0025] 200 - circuit board;

[0026] 300 - display panel; 310 - first electrical connection area; 320 - second electrical connection area. DETAILED DESCRIPTION

[0027] The present application is described in detail below, examples of embodiments of the present application are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar components or components having the same or similar functions throughout. In addition, if a detailed description of known technology is unnecessary for the features of the present application shown, it is omitted. The embodiments described below by reference to the accompanying drawings are exemplary and are for the purpose of explaining the present application only, and cannot be interpreted as a limitation on the present application.

[0028] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such.

[0029] Those skilled in the art can understand that, unless otherwise stated, the singular forms "a", "an" and "the" used herein also include the plural forms. It should be further understood that the use of the phrase "comprising" in the specification of the present application means that the stated features, elements and / or components are present, but does not exclude the presence or addition of one or more other features, elements, components and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be intermediate elements. In addition, "connected" or "coupled" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any single unit and all combinations of the associated listed items.

[0030] The inventors of the present application have found that existing display products usually use FPC (flexible circuit board) to realize the transmission of control signals between the circuit board and the display panel. In high-resolution display products or large-size display products, due to the large increase in signal lines, the width of the flexible circuit board is large, which occupies a large product space, which is not conducive to the compact layout of the display product.

[0031] In addition, in the case that the width of the flexible circuit board is too large, the existing electrical connection process cannot meet the design specification pre-shrinkage, which reduces the electrical connection yield between the flexible circuit board and the display panel.

[0032] The electrical connection structure, the display panel and the display device provided by the present application aim to solve the above technical problems of the prior art.

[0033] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments.

[0034] The present application provides an electrical connection structure 100, a structural schematic diagram of the electrical connection structure 100 is shown in Figure 1 and Figure 2 The electrical connection structure 100 includes a flexible circuit board 110, a first chip on film 120 and a second chip on film 130.

[0035] One end of the flexible circuit board 110 is used for electrical connection with a circuit board 200, and the other end of the flexible circuit board 110 is clamped between one end of the first chip on film 120 and one end of the second chip on film 130.

[0036] One end of the first chip on film 120 is electrically connected with one side of the other end of the flexible circuit board 110, and one end of the second chip on film 130 is electrically connected with the other side of the other end of the flexible circuit board 110.

[0037] The other end of the first chip on film 120 and the other end of the second chip on film 130 are respectively used for electrical connection with a display panel 300.

[0038] In the present embodiment, the first chip on film 120 and the second chip on film 130 are used to transmit signals between the flexible circuit board 110 and the display panel 300, and the bonding area is designed on at least both sides of the flexible circuit board 110, and the first chip on film 120 and the second chip on film 130 are respectively electrically connected with the bonding area of the two sides of the flexible circuit board 110, that is, double-sided bonding is achieved, so that the width of the flexible circuit board 110 can be effectively reduced, the space occupancy ratio of the flexible circuit board 110 to the display product is reduced, which is conducive to the compact layout of the display product. The saved space can be used to arrange other components to improve the performance of the display product. For example, the saved space can be used to increase the battery capacity to improve the endurance time of the display product.

[0039] In addition, the width of the flexible circuit board 110 is reduced, and the width of the chip on film is also small, which is conducive to improving the yield of electrical connection between the chip on film and the flexible circuit board 110, and is also conducive to improving the yield of electrical connection between the chip on film and the display panel 300, thereby improving the yield of electrical connection between the flexible circuit board 110 and the display panel 300.

[0040] The inventors of the present application consider that the first CTF 120 and the second CTF 130 are double-side bonded with the FPC 110, which can effectively reduce the width of the FPC 110. Therefore, the present application provides the following possible implementation for the first CTF 120 and the second CTF 130:

[0041] As shown in FIG. 1, the projection of one end of the first CTF 120 on the FPC 110 at least partially overlaps with the projection of one end of the second CTF 130 on the FPC 110. Figure 2

[0042] In the embodiment, the more the two projections overlap, the more conducive to the reduction of the width of the FPC 110.

[0043] Specifically, the projection of one end of the first CTF 120 on the FPC 110 can be compared with the projection of one end of the second CTF 130 on the FPC 110 by taking the side of the FPC 110 close to the first CTF 120 as a reference projection surface. Alternatively, the projection of one end of the first CTF 120 on the FPC 110 can be compared with the projection of one end of the second CTF 130 on the FPC 110 by taking the side of the FPC 110 close to the second CTF 130 as a reference projection surface.

[0044] The inventors of the present application consider that one end of the first CTF 120 and one end of the second CTF 130 are double-side bonded with the FPC 110, and the respective projections at least partially overlap, while the other end of the first CTF 120 and the other end of the second CTF 130 need to establish electrical connection with the display panel 300. Therefore, the present application provides the following possible implementation for the first CTF 120 and the second CTF 130:

[0045] As shown in FIG. 2, the axial direction of the first CTF 120 forms an angle α with the axial direction of the second CTF 130, 0 < α ≤ 90°. Figure 1

[0046] For the sake of clarity, the present application defines that the axial direction of the first CTF 120 is the central axis direction of the first CTF 120 from one end of the FPC 110 to one end of the display panel 300; and the axial direction of the second CTF 130 is the central axis direction of the second CTF 130 from one end of the FPC 110 to one end of the display panel 300.

[0047] ​​In the embodiment, the angle between the axial direction of the first COF 120 and the axial direction of the second COF 130 is 0-90°, the other end of the first COF 120 is separated from the other end of the second COF 130, and a coplanar and non-overlapping structure can be formed, which is beneficial to electrical connection with the display panel 300 having a single-side bonding area.

[0048] The angle between the axial direction of the first COF 120 and the axial direction of the second COF 130 is 0-90°, which is also beneficial to the technical improvement mentioned below.

[0049] The inventors of the present application consider that, in the state that one end of the first COF 120 and one end of the second COF 130 are double-side bonded to the FPC 110 and the aforementioned projections at least partially overlap, the direction of the integrated circuits in the first COF 120 is parallel or close to parallel to the direction of the integrated circuits in the second COF 130, which may cause signal interference and reduce display quality. Therefore, the present application provides the following possible implementation for the first COF 120 and the second COF 130:

[0050] In the embodiment of the present application, the direction of the integrated circuits in the first COF 120 is at an angle β (0<β≤90°) to the direction of the integrated circuits in the second COF 130.

[0051] For the purpose of clear illustration, the present application defines that the angle β is the angle between the projection of the direction of the integrated circuits in the first COF 120 on the second COF 130 and the direction of the integrated circuits in the second COF 130, or the angle β is the angle between the projection of the direction of the integrated circuits in the second COF 130 on the first COF 120 and the direction of the integrated circuits in the first COF 120.

[0052] In the embodiment, the direction of the integrated circuits in the first COF 120 is at an angle of 0-90° to the direction of the integrated circuits in the second COF 130, which avoids the direction of the integrated circuits in the first COF 120 being parallel to the direction of the integrated circuits in the second COF 130 and reduces possible signal interference between them.

[0053] In the structure provided in the foregoing embodiment, in which the angle between the axial direction of the first COF 120 and the axial direction of the second COF 130 is 0-90°, the direction of the integrated circuits in the first COF 120 is more likely to be at an angle of 0-90° to the direction of the integrated circuits in the second COF 130.

[0054] The inventors of the present application consider that in some application scenarios, the first COF 120 and the second COF 130 need to be electrically connected with the display panel 300 having a single-side bonding area; or, the layout of the integrated circuits in the first COF 120 needs to avoid being parallel to the layout of the integrated circuits in the second COF 130, so as to reduce possible signal interference therebetween. To this end, the present application provides the following possible implementation manner for the first COF 120 or the second COF 130:

[0055] As shown in FIG. 1, at least one of the first COF 120 and the second COF 130 in the embodiments of the present application is a parallelogram structure. Figure 1

[0056] In the present embodiment, the first COF 120 or the second COF 130 adopts a parallelogram structure, which can on the one hand provide a relatively regular integrated circuit bearing surface, facilitating the layout of the integrated circuits; and on the other hand, facilitate the integrated circuits in the first COF 120 or the second COF 130 to be arranged in equidistant translation from the circuit board 200 end to the display panel 300 end.

[0057] It can be understood that if the first COF 120 and the second COF 130 are both parallelogram structures, the two parallelogram structures can be arranged in opposite inclined directions, or the two parallelogram structures can be arranged in the same inclined direction but different inclined angles.

[0058] Based on the same inventive concept, the embodiments of the present application provide a display panel 300, which comprises: a pin area.

[0059] The pin area is used to electrically connect with the other end of the first COF 120 and the other end of the second COF 130 of any one of the electrical connection structures 100 provided in the above embodiments.

[0060] In the present embodiment, the pin area of the display device can be electrically connected with the other end of the first COF 120 and the other end of the second COF 130 of any one of the electrical connection structures 100 provided in the above embodiments, and the principles and technical effects thereof are described in the above embodiments and will not be repeated here.

[0061] The inventors of the present application consider that the pin area of the display panel 300 needs to be electrically connected with the other end of the first COF 120 and the other end of the second COF 130 of any one of the electrical connection structures 100 provided in the above embodiments. To this end, the present application provides the following possible implementation manner for the display panel 300:

[0062] As shown in FIG. 1, at least one of the first COF 120 and the second COF 130 in the embodiments of the present application is a parallelogram structure. Figure 3 ​As shown, the pin area of ​​the embodiment of the present application includes a first electrical connection area 310 and a second electrical connection area 320 .

[0063] The first electrical connection area 310 and the second electrical connection area 320 are located on the same side of the pin area and are spaced apart.

[0064] The first electrical connection region 310 is used for bonding with the first COF 120 , and the second electrical connection region 320 is used for bonding with the second COF 130 .

[0065] In this embodiment, in the pin region of the display panel 300, the first electrical connection region 310 and the second electrical connection region 320 are located on the same side of the pin region and are spaced apart. That is, the display panel 300 adopts a single-sided bonding region structure, which is suitable for display panels 300 with larger sizes and more ample layout space.

[0066] Based on the same considerations as above, the inventors of this application provide another possible implementation of the display panel 300 as follows:

[0067] like Figure 4 As shown, the pin area of ​​the embodiment of the present application includes a first electrical connection area 310 and a second electrical connection area 320 .

[0068] The first electrical connection area 310 is located on one side of the pin area, and the second electrical connection area 320 is located on the other side of the pin area. The first electrical connection area 310 is insulated from the second electrical connection area 320 .

[0069] The first electrical connection region 310 is used for bonding with the first COF 120 , and the second electrical connection region 320 is used for bonding with the second COF 130 .

[0070] In this embodiment, in the pin region of the display panel 300, the first electrical connection region 310 and the second electrical connection region 320 are located on different sides of the pin region and are insulated from each other. That is, the display panel 300 adopts a double-sided bonding region structure, which is suitable for display panels 300 with smaller sizes and more limited layout space.

[0071] Based on the same inventive concept, an embodiment of the present application provides a display device, which includes: any one of the electrical connection structures 100 provided in the above embodiments.

[0072] In this embodiment, since the display device adopts any one of the electrical connection structures 100 provided in the aforementioned embodiments, its principles and technical effects can be referred to in the aforementioned embodiments and will not be described in detail here.

[0073] In some possible implementation manners, the display device comprises any one of the electric connection structures 100 provided in the above embodiments, any one of the display panels 300 provided in the above embodiments, and the circuit board 200; one end of the flexible circuit board 110 of the electric connection structure 100 is electrically connected with the circuit board 200, and the other end of the first COF 120 and the other end of the second COF 130 of the electric connection structure 100 are respectively electrically connected with the display panel 300.

[0074] In the embodiment, the display device adopts any one of the electric connection structures 100 provided in the above embodiments and any one of the display panels 300 provided in the above embodiments, and the principles and technical effects can refer to the above embodiments, which will not be repeated here.

[0075] Optionally, the other end of the first COF 120 of the electric connection structure 100 is bonded with the first electric connection area 310 in the pin area of the display panel 300; and the other end of the second COF 130 of the electric connection structure 100 is bonded with the second electric connection area 320 in the pin area of the display panel 300.

[0076] By using the embodiments of the present application, the following beneficial effects can be achieved:

[0077] 1. The first COF 120 and the second COF 130 are used to transmit signals between the flexible circuit board 110 and the display panel 300, and at least the bonding areas are designed on both surfaces of the flexible circuit board 110, the first COF 120 and the second COF 130 are respectively electrically connected with the bonding areas on the two surfaces of the flexible circuit board 110, that is, double bonding is achieved, so that the width of the flexible circuit board 110 can be effectively reduced, the space occupation ratio of the flexible circuit board 110 to the display product is reduced, and the compact layout of the display product is facilitated.

[0078] 2. The width of the flexible circuit board 110 is reduced, and the width of the COF is also small, which is beneficial to improve the yield of the electrical connection between the COF and the flexible circuit board 110, and is also beneficial to improve the yield of the electrical connection between the COF and the display panel 300, so as to improve the yield of the electrical connection between the flexible circuit board 110 and the display panel 300.

[0079] 3. The more the projection of one end of the first COF 120 on the flexible circuit board 110 overlaps with the projection of one end of the second COF 130 on the flexible circuit board 110, the more conducive to the reduction of the width of the flexible circuit board 110.

[0080] 4. The axial direction of the first COF 120 forms an angle of 0 to 90° with the axial direction of the second COF 130, so that the other end of the first COF 120 is separated from the other end of the second COF 130 to form a coplanar and non-overlapping structure, which is convenient for electrical connection with the display panel 300 having a single-sided bonding area.

[0081] 5. The routing direction of some integrated circuits in the first chip-on-film 120 forms an angle of 0 to 90 degrees with the routing direction of some integrated circuits in the second chip-on-film 130. That is, the routing direction of the integrated circuits in the first chip-on-film 120 is prevented from being parallel to the routing direction of the integrated circuits in the second chip-on-film 130, thereby reducing possible signal interference between them.

[0082] 6. The first chip-on-film 120 or the second chip-on-film 130 adopts a parallelogram structure. On the one hand, it can provide a relatively regular integrated circuit carrying surface, which is conducive to the routing arrangement of the integrated circuit; on the other hand, it is beneficial for the integrated circuit in the first chip-on-film 120 or the second chip-on-film 130 to achieve equidistant translation layout from the circuit board 200 end to the display panel 300 end.

[0083] 7. In the pin area of ​​the display panel 300, the first electrical connection area 310 and the second electrical connection area 320 are located on the same side of the pin area and are spaced apart. That is, the display panel 300 adopts a single-sided bonding area structure, which is suitable for display panels 300 with larger sizes and more ample layout space.

[0084] 8. In the pin area of ​​the display panel 300, the first electrical connection area 310 and the second electrical connection area 320 are located on different sides of the pin area and are insulated from each other. That is, the display panel 300 adopts a double-sided bonding area structure, which is suitable for display panels 300 with smaller sizes and more limited layout space.

[0085] Those skilled in the art will appreciate that, in the description of this application, it is necessary to understand that the terms “center,” “up,” “down,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside” and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0086] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0087] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0088] In the description of the specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0089] The above is only part of the embodiments of the present application, it should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can also be made, which should be considered as the protection scope of the present application.

Claims

1. A display device, characterized in that: The device comprises an electrical connection structure, a display panel, and a circuit board; one end of the flexible circuit board of the electrical connection structure is electrically connected to the circuit board, and the other end of the first chip-on-film and the other end of the second chip-on-film of the electrical connection structure are electrically connected to the display panel respectively; The electrical connection structure includes: a flexible circuit board, a first chip-on-film and a second chip-on-film; One end of the flexible circuit board is used to be electrically connected to the circuit board; The other end of the flexible circuit board is sandwiched between one end of the first chip-on-film and one end of the second chip-on-film; One end of the first chip-on-film is electrically connected to one side of the other end of the flexible circuit board; one end of the second chip-on-film is electrically connected to the other side of the other end of the flexible circuit board; The other end of the first chip-on-film and the other end of the second chip-on-film are respectively used to be electrically connected to the display panel; A projection of one end of the first chip-on-film on the flexible circuit board and a projection of one end of the second chip-on-film on the flexible circuit board at least partially overlap; The display panel includes: a pin area; the pin area is used to electrically connect to the other end of the first chip-on-film of the electrical connection structure and the other end of the second chip-on-film; The pin area includes a first electrical connection area and a second electrical connection area; The first electrical connection area is located on one side of the pin area, and the second electrical connection area is located on the other side of the pin area; the first electrical connection area is insulated from the second electrical connection area; The first electrical connection region is used for bonding with the first flip chip film, and the second electrical connection region is used for bonding with the second flip chip film.

2. The display device according to claim 1, wherein At least one of the first chip-on-film and the second chip-on-film is a parallelogram structure.

3. The display device according to claim 1, wherein The axial direction of the first flip chip forms an angle α with the axial direction of the second flip chip, 0<α≤90°; the routing direction of some integrated circuits in the first flip chip forms an angle β with the routing direction of some integrated circuits in the second flip chip, 0<β≤90°.

4. The display device according to claim 1, wherein The other end of the first COF of the electrical connection structure is bonded to the first electrical connection area in the pin area of ​​the display panel; The other end of the second COF of the electrical connection structure is bonded to the second electrical connection area in the pin area of ​​the display panel.

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