Flexible circuit board, light bar, light source and display device

Abstract

The application discloses a flexible circuit board, a light bar, a light source and a display device, wherein the light source comprises the flexible circuit board and the light bar, the flexible circuit board is used for fixing the light bar and providing signals for the light bar, the flexible circuit board comprises a plurality of effective welding parts and at least one auxiliary welding part, the light bar comprises a plurality of effective pads and at least one auxiliary pad, the effective welding parts correspond to the effective pads one by one, the auxiliary welding part corresponds to the auxiliary pad one by one, the effective welding part is fixed with the corresponding effective pad and is used for transmitting the signals loaded by itself to the corresponding effective pad, and the auxiliary welding part is fixed with the corresponding auxiliary pad and is used for strengthening the fixing firmness between the flexible circuit board and the light bar. The technical scheme of the application can increase the maximum pulling force that can be borne between the flexible circuit board and the light bar by adding the auxiliary welding part and the corresponding auxiliary pad, so that the phenomenon that the effective welding points are broken can be avoided.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a flexible circuit board, a light strip, a light source, and a display device. Background Technology

[0002] The backlight module is one of the components in a liquid crystal display device, and the light source is the core component of the backlight module. The light source typically consists of a flexible circuit board and LED strips. The flexible circuit board transmits the light emission signals output by the control chip to the LED strips, and it has several effective solder joints. The LED strip includes a connecting plate and a chip-on-board (COB) mounted on one side of the connecting plate. The other side of the connecting plate has several effective solder pads, each corresponding to a valid solder joint on the flexible circuit board.

[0003] The effective solder joints are soldered to the corresponding effective pads using a soldering process to fix the flexible circuit board to the LED strip. The light emission signal output by the control chip is transmitted sequentially through the signal traces in the flexible circuit board, the effective solder joints, and the effective pads on the LED strip to the light-emitting chip, thereby controlling the light-emitting chip to emit light.

[0004] After the flexible circuit board is fixed to the LED strip, it needs to be bent to the back of the back plate to facilitate subsequent assembly. At this time, the bent flexible circuit board will exert a tensile force on the LED strip. In practical applications, it has been found that due to the limited number of welding positions between the flexible circuit board and the LED strip (the maximum tensile force that can be withstood is limited), under the action of tensile force, some or even all welding positions will break (i.e., "cold solder joint"), affecting the transmission of light emission signals. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a flexible circuit board, a light strip, a light source, and a display device.

[0006] To achieve the above objectives, the present invention provides a flexible circuit board for fixing to a light strip and providing signals to the light strip. The flexible circuit board includes: a plurality of effective soldering portions, which are used to fix to corresponding effective pads on the light strip and transmit the signals they carry to the corresponding effective pads. The flexible circuit board also includes: at least one auxiliary soldering portion, which is used to fix to corresponding auxiliary pads on the light strip to enhance the firmness of the fixation between the flexible circuit board and the light strip.

[0007] Optionally, the flexible circuit board further includes: a circuit body, at least one lead-out portion extending from the circuit body, and a fixing portion corresponding to each lead-out portion, wherein the fixing portion corresponds to a welding area preset on the light strip.

[0008] The fixing part is connected to the end of the corresponding lead-out part. The effective welding part and the auxiliary welding part are both located on the fixing part. Each fixing part is provided with at least one effective welding part and at least one auxiliary welding part.

[0009] Optionally, the number of the leads can be multiple.

[0010] Optionally, on the fixing part, the distance between the auxiliary welding part that is furthest from the end of the corresponding lead-out part and the end of the corresponding lead-out part is denoted as L1;

[0011] The effective weld portion that is closest to the end of the corresponding lead-out portion is denoted as L2.

[0012] Among them, L2 is greater than L1.

[0013] Optionally, the fixing part is provided with one auxiliary welding part and two effective welding parts, and the two effective welding parts are respectively located on both sides of the one auxiliary welding part.

[0014] To achieve the above objectives, the present invention also provides a light strip for fixing to a flexible circuit board and receiving signals provided by the flexible circuit board. The light strip includes: a plurality of effective pads, which are used to fix to corresponding effective solder parts on the flexible circuit board and to acquire signals transmitted by the corresponding effective solder parts. The light strip also includes: at least one auxiliary pad, which is used to fix to corresponding auxiliary solder parts on the flexible circuit board to enhance the firmness of the fixation between the flexible circuit board and the light strip.

[0015] Optionally, the light strip is divided into at least one welding area, and the welding area corresponds one-to-one with the fixing part pre-set on the flexible circuit board;

[0016] Both the effective pad and the auxiliary pad are located within the welding area, and each welding area is provided with at least one effective pad and at least one auxiliary pad.

[0017] Optionally, the number of welding areas is multiple.

[0018] Optionally, the welding area is provided with one auxiliary pad and two effective pads, with the two effective pads located on both sides of the one auxiliary pad.

[0019] Optionally, at least one of the valid pads is a positive pad;

[0020] The auxiliary pad is connected in parallel with the positive electrode pad.

[0021] To achieve the above objectives, the present invention also provides a light source, comprising: a flexible circuit board and a light strip, wherein the flexible circuit board is used to fix the light strip and provide signals to the light strip, the flexible circuit board includes: a plurality of effective soldering portions, the light strip includes: a plurality of effective solder pads, each effective soldering portion corresponding to one of the effective solder pads, and the effective soldering portion is fixed to the corresponding effective solder pad for transmitting the signal loaded thereon to the corresponding effective solder pad; the flexible circuit board further includes: at least one auxiliary soldering portion, the light strip further includes: at least one auxiliary solder pad, each auxiliary soldering portion corresponding to one of the auxiliary solder pads, and the auxiliary soldering portion is fixed to the corresponding auxiliary solder pad for strengthening the fixation between the flexible circuit board and the light strip.

[0022] Optionally, the flexible circuit board further includes: a circuit body, at least one lead-out portion extending from the circuit body, and a fixing portion corresponding to each lead-out portion. The fixing portion is connected to the end of the corresponding lead-out portion. The effective welding portion and the auxiliary welding portion are both located on the corresponding fixing portion. Each fixing portion is provided with at least one effective welding portion and at least one auxiliary welding portion.

[0023] The light strip is divided into at least one welding area, and the welding area corresponds one-to-one with the fixing part. The effective solder pad and the auxiliary solder pad are both located in the welding area, and each welding area is provided with at least one effective solder pad and at least one auxiliary solder pad.

[0024] Optionally, the number of the leads can be multiple.

[0025] Optionally, on the fixing part, the distance between the auxiliary welding part that is furthest from the end of the corresponding lead-out part and the end of the corresponding lead-out part is denoted as L1;

[0026] The effective weld portion that is closest to the end of the corresponding lead-out portion is denoted as L2.

[0027] Among them, L2 is greater than L1.

[0028] Optionally, the fixing part is provided with one auxiliary welding part and two effective welding parts, and the two effective welding parts are respectively located on both sides of the one auxiliary welding part;

[0029] The welding area is provided with one auxiliary pad and two effective pads, with the two effective pads located on both sides of the one auxiliary pad.

[0030] Optionally, at least one of the valid pads is a positive pad;

[0031] The auxiliary pad is connected in parallel with the positive electrode pad.

[0032] To achieve the above objectives, the present invention also provides a display device, comprising: a light source as described above. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of flexible circuit boards and light strips in the prior art;

[0034] Figure 2 This is a schematic diagram illustrating the welding process between a flexible circuit board and a light strip in the prior art.

[0035] Figure 3 This is a schematic diagram of a flexible circuit board folded to the back of a backplate.

[0036] Figure 4 This invention provides a structural schematic diagram of a flexible circuit board and a light strip;

[0037] Figure 5 A schematic diagram of the flexible circuit board and light strip provided by the present invention during the welding process;

[0038] Figure 6 This is a schematic diagram of the flexible circuit board folded to the back of the back plate in this invention;

[0039] Figure 7 for Figure 3 Schematic diagram of the cross section along the AA direction;

[0040] Figure 8 for Figure 3 Schematic diagram of the cross section along the BB direction;

[0041] Figure 9 for Figure 6 A schematic diagram of the cross-section along the CC direction;

[0042] Figure 10a This is a schematic diagram of one side of the light strip in this invention where a light-emitting chip is disposed;

[0043] Figure 10b This is a schematic diagram of the side of the light strip with solder pads in this invention. Detailed Implementation

[0044] To enable those skilled in the art to better understand the technical solution of the present invention, a flexible circuit board, light strip, light source, and display device provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0045] Figure 1This is a schematic diagram of the structure of flexible circuit boards and light strips in the prior art. Figure 2 This is a schematic diagram illustrating the welding process between a flexible circuit board and a light strip in existing technologies. Figure 3 This is a schematic diagram showing the flexible circuit board folded to the back of the backplate, as shown. Figures 1 to 3 As shown, in the prior art, after each effective solder part 101 on the flexible circuit board 1 is welded and fixed to each corresponding effective solder pad 201 on the light strip 2, the circuit body 11 of the flexible circuit board 1 needs to be bent to the back of the back plate 3. At this time, the bent part of the flexible circuit board 1 generates a tensile force on the light strip 2 through the welding position. Since the number of effective solder pads 201 and effective solder parts 101 is limited, the maximum tensile force that the flexible circuit board 1 and the light strip 2 can withstand is limited. Once the tensile force generated by the bending of the flexible circuit board 1 is greater than or close to the maximum tensile force that both can withstand, it will cause some or even all of the effective solder points (the positions where the effective solder parts 101 and the corresponding effective solder pads 201 are welded) to break.

[0046] The technical solution provided by this invention can effectively solve the above-mentioned technical problems, and will be described in detail below with reference to the accompanying drawings.

[0047] Figure 4 This is a schematic diagram of the structure of a flexible circuit board and a light strip provided by the present invention. Figure 5 This is a schematic diagram of the flexible circuit board and light strip provided by the present invention during the welding process. Figure 6 This is a schematic diagram of the flexible circuit board folded to the back of the backplate in this invention, as shown below. Figures 4 to 6 As shown, Embodiment 1 of the present invention provides a flexible circuit board 1. The flexible circuit board 1 is used to fix with a light strip 2 and provide signals to the light strip 2. The flexible circuit board 1 includes: a plurality of effective soldering parts 101 and at least one auxiliary soldering part 102. The effective soldering parts 101 are used to fix with the corresponding effective pads 201 on the light strip 2 and transmit the signals they carry to the corresponding effective pads 201. The auxiliary soldering parts 102 are used to fix with the corresponding auxiliary pads 204 on the light strip 2 to enhance the firmness of the fixation between the flexible circuit board 1 and the light strip 2.

[0048] In this invention, an auxiliary welding part 102 is provided on the flexible circuit board 1. The auxiliary welding part 102 corresponds one-to-one with the auxiliary pads 204 pre-set on the light strip 2. During the welding process, not only are the effective welding parts 101 on the flexible circuit board 1 welded and fixed to the effective pads 201 on the light strip 2, but the auxiliary welding parts 102 on the flexible circuit board 1 are also welded and fixed to the auxiliary pads 204 on the light strip 2. When the number of effective welding points is fixed, by adding auxiliary welding points (the positions where the auxiliary welding parts 102 and the corresponding auxiliary pads 204 are welded), the maximum tensile force that the flexible circuit board 1 and the light strip 2 can withstand can be increased, thereby avoiding the phenomenon of breakage of the effective welding points.

[0049] It should be noted that the case shown in the accompanying drawings, where the number of effective soldering portions 101 on the flexible circuit board 1 is four and the number of auxiliary soldering portions 102 is two, is merely illustrative and does not limit the technical solution of the present invention. Those skilled in the art should understand that the number of effective soldering portions 101 and auxiliary soldering portions 102 is not limited in the present invention.

[0050] Furthermore, while the effective soldering portion 101 and the auxiliary soldering portion 102 on the flexible circuit board 1 can be identical in material, shape, and size, they differ fundamentally in structure and function. Specifically, the effective soldering portion 101 is electrically connected to the signal traces on the flexible circuit board 1 used for signal transmission, while the auxiliary soldering portion 102 is not electrically connected to the signal traces on the flexible circuit board 1. The effective soldering portion 101 not only serves to solder and fix the corresponding effective pad 201 but also provides a light-emitting signal for the light strip 2, while the auxiliary soldering portion 102 only serves to solder and fix the corresponding auxiliary pad 204 and cannot provide a light-emitting signal for the light strip 2.

[0051] Optionally, the flexible circuit board 1 further includes: a circuit body 11, at least one lead-out portion 12 extending from the circuit body 11, and a fixing portion 13 corresponding to the lead-out portion 12. The fixing portion 13 corresponds to the welding area 5 preset on the light strip 2. Each fixing portion 13 is connected to the end of the corresponding lead-out portion 12. The effective welding portion 101 and the auxiliary welding portion 102 are both located on the fixing portion 13. Each fixing portion 13 is provided with at least one effective welding portion 101 and at least one auxiliary welding portion 102.

[0052] It should be noted that the light strip 2 is pre-set with several welding areas 5, and each welding area 5 is provided with at least one effective solder pad 201 and at least one auxiliary solder pad 204. During welding, the fixing parts 13 of the flexible circuit board 1 are first aligned with the welding areas 5 on the light strip 2, and then the effective welding parts 101 on the fixing parts 13 are aligned with the effective solder pads 201 in the welding areas 5, and the auxiliary welding parts 102 on the fixing parts 13 are aligned with the auxiliary solder pads 204 in the welding areas 5.

[0053] In this invention, in addition to the effective welding part 101, each fixing part 13 is also provided with at least one auxiliary welding part 102, which can effectively enhance the firmness of the fixing between the fixing part 13 and the corresponding welding area 5.

[0054] Figure 7 for Figure 3 Schematic diagram of the cross section along the AA direction. Figure 8 for Figure 3 A schematic diagram of the cross-section along the BB direction is shown below. Figure 7 and Figure 8 As shown, in the backlight module, double-sided tape 9 is often used to bond and fix the light strip 2 to the side wall of the back plate 3. The side wall of the back plate 3 is designed with a hollow structure (avoidance area) corresponding to the welding area 5 on the light strip 2, so that the flexible circuit board 1 can be bent to the back of the back plate 3.

[0055] In the prior art, the number of welding areas 5 on the light strip 2 is one, and the number of lead-out parts 12 and fixing parts 13 in the flexible circuit board 1 is one. All effective solder pads 201 are set in the same welding area 5, and all effective welding parts 101 are located on the same fixing part 13. This results in a relatively long length of welding area 5. Since the part of the light strip 2 corresponding to welding area 5 is not fixed by the back plate 3, when the length of welding area 5 is too long, the part of the light strip 2 corresponding to welding area 5 is easily deformed by the tensile force of the flexible circuit board 11. At this time, the distribution of light-emitting chips 203 on the light strip 2 corresponding to welding area 5 will change, and the light brightness on the light strip 2 corresponding to welding area 5 will be uneven, resulting in uneven overall light brightness of the light strip 2 (i.e., "light bursting" problem). The light emitted by the light strip 2 to the optical device 4 (e.g., light guide plate) is non-uniform light.

[0056] To solve this technical problem, in this invention, preferably, the number of lead-out parts 12 is multiple, that is, the number of fixing parts 13 is multiple, and the number of welding areas 5 correspondingly provided on the light strip 2 is multiple. Figure 9 for Figure 6 A schematic diagram of the cross-section along the CC direction is shown below. Figure 9As shown, with a fixed number of pads (including effective pads 201 and auxiliary pads 204) on the light strip 2, by setting multiple welding areas 5 and distributing the pads to each welding area 5, the technical solution of the present invention can effectively reduce the length of the welding area (the length of the hollow area is correspondingly reduced) compared with the prior art. This can, to a certain extent, prevent the part of the light strip 2 corresponding to the welding area 5 from being deformed by the tensile force (the part of the light strip 2 corresponding to the welding area 5 can remain flat), thereby ensuring the uniformity of the overall luminous brightness of the light strip 2.

[0057] It should be noted that the appendix Figure 4-6 The case shown with two lead-out portions 12 and two fixing portions 13 is merely illustrative and does not limit the technical solution of the present invention. In the present invention, as the number of effective welding portions 101 and auxiliary welding portions 102 increases, the number of lead-out portions 12 and fixing portions 13 can also increase accordingly.

[0058] In this embodiment, for any fixed part 13, the distance between the auxiliary welding part 102 on the fixed part that is farthest from the end of the corresponding lead-out part 12 and the end of the corresponding lead-out part 12 is denoted as L1; the distance between the effective welding part 101 on the fixed part that is closest to the end of the corresponding lead-out part 12 and the end of the corresponding lead-out part 12 is denoted as L2; ​​wherein, L2 is greater than L1.

[0059] During the bending of the flexible circuit board 1 to the back of the backplate 3, the bending area is located on the lead-out portion 12. At this time, there is a large stress on the lead-out portion 12, which will generate a certain tensile force on the fixing portion 13 to which it is connected. This tensile force will generate a certain stress on the fixing portion 13, which will be converted into a tensile force on the solder joints (including effective solder joints and auxiliary solder joints). Specifically, the lead-out portion 12 will apply a tensile force to the corresponding fixing portion 13 through its end. The closer the fixing portion 13 is to the end of the corresponding lead-out portion 12, the greater the stress generated, and the greater the tensile force on the solder joint at that position; conversely, the farther the fixing portion 13 is from the end of the corresponding lead-out portion 12, the smaller the stress generated, and the smaller the tensile force on the solder joint at that position. Therefore, the solder joint closer to the end of the corresponding lead-out portion 12 is more prone to breakage.

[0060] Therefore, in this invention, the auxiliary welding part 102 is positioned closer to the end of the lead-out part 12, while the effective welding part 101 is positioned farther from the end of the lead-out part 12, in order to reduce the tensile force on the effective welding point. In this case, even if some welding points break, the welding point that breaks first is the auxiliary welding point, and the breakage of the auxiliary welding point will not affect the signal transmission between the flexible circuit board 1 and the light strip 2. Therefore, the technical solution of this invention can improve the reliability of the product.

[0061] As a specific alternative, each fixing part 13 is provided with one auxiliary welding part 102 and two effective welding parts 101. In this way, while ensuring the firmness of the fixing part 13 and the corresponding welding area 5, it is also possible to ensure that the length of the corresponding welding area 5 on the light strip 2 is not too long, so as to avoid deformation of the part of the corresponding welding area 5 on the light strip 2.

[0062] More preferably, the end of the lead-out portion 12 is connected to the middle position of the corresponding fixing portion 13, the auxiliary welding portion 102 is located in the middle position of the fixing portion 13, and the two effective welding portions 101 are respectively located on both sides of the auxiliary welding portion 102. Since the distance between the effective welding portion 101 and the end of the lead-out portion 12 is greater than the distance between the auxiliary welding portion 102 and the end of the lead-out portion 12, after the fixing portion 13 is welded and the lead-out portion 12 is bent, the tensile force on the effective welding point is less than the tensile force on the auxiliary welding point, thereby improving the reliability of the product.

[0063] See also Figures 4 to 6 As shown, Embodiment 1 of the present invention also provides a light strip 2, which is adapted to the flexible circuit board 1 described above. The light strip 2 is used to fix itself to the flexible circuit board 1 and receive signals provided by the flexible circuit board 1. The light strip 2 includes: a plurality of effective solder pads 201 and at least one auxiliary solder pad 204. The effective solder pads 201 are used to fix themselves to the corresponding effective solder parts 101 on the flexible circuit board 1 and to obtain the signals transmitted by the corresponding effective solder parts 101. The auxiliary solder pads 204 are used to fix themselves to the corresponding auxiliary solder parts 102 on the flexible circuit board 1 to enhance the firmness of the fixation between the flexible circuit board 1 and the light strip 2.

[0064] In this invention, the light strip 2 is provided with auxiliary solder pads 204, which correspond one-to-one with the auxiliary welding parts 102 provided on the light strip 2. During the welding process, not only are the effective solder pads 201 on the light strip 2 welded and fixed to the effective welding parts 101 on the flexible circuit board 1, but the auxiliary solder pads 204 on the light strip 2 are also welded and fixed to the auxiliary welding parts 102 on the flexible circuit board 1. With a fixed number of effective welding points, this invention increases the maximum tensile force that the light strip 2 and the flexible circuit board 1 can withstand by adding auxiliary welding points, thereby avoiding the phenomenon of breakage of effective welding points.

[0065] It should be noted that the case shown in the attached drawings, where the number of effective pads 201 on the light strip 2 is 4 and the number of auxiliary pads 204 is 2, is merely illustrative and does not limit the technical solution of the present invention. Those skilled in the art should understand that the number of effective pads 201 and auxiliary pads 204 is not limited in the present invention.

[0066] Figure 10a This is a schematic diagram of one side of the light strip in this invention where a light-emitting chip is disposed; Figure 10b This is a schematic diagram of the side of the light strip in this invention where the solder pads are located, as shown. Figure 10a and Figure 10b As shown, all the light-emitting chips 203 located on one side of the inner connecting plate 202 of the light strip 2 are divided into several light-emitting groups (only three light-emitting groups are shown as an example in the attached figure). The light-emitting chips 203 in the same light-emitting group are further divided into several light-emitting subgroups in parallel, and the light-emitting chips 203 in the same light-emitting subgroup are connected in series. For any light-emitting group, there is a corresponding positive electrode 6a / 6c / 6e and a corresponding negative electrode 6b / 6d / 6f. When voltage is applied to both the positive electrode 6a / 6c / 6e and the negative electrode 6b / 6d / 6f and there is a certain voltage difference, the corresponding light-emitting group can emit light. The other side of the connecting plate 202 is provided with the aforementioned effective pads 201. Depending on the output object, the effective pads 201 can be divided into two types. Specifically, the effective pads 201 that provide signals to the positive electrodes 6a / 6c / 6e are called positive pads 201a, and the effective pads 201 that provide signals to the negative electrodes 6b / 6d / 6f are called negative pads 201b / 201c / 201d. To facilitate the establishment of electrical connections between the positive electrode pad 201a and the corresponding positive electrode 6a / 6c / 6e, and between the negative electrode pads 201b / 201c / 201d and the corresponding negative electrode 6b / 6d / 6f (negative electrode pad 201b corresponds to negative electrode 6b, negative electrode pad 201c corresponds to negative electrode 6d, and negative electrode pad 201d corresponds to negative electrode 6f), openings are often provided on the connecting plate 202 at the positions corresponding to the positive / negative electrodes 6a / 6b / 6c / 6d / 6e / 6f. The positive / negative electrodes 6a / 6b / 6c / 6d / 6e / 6f penetrate the connecting plate 202 through the corresponding openings. The light-emitting chip 203 is connected to one end of the corresponding positive / negative electrode 6a / 6b / 6c / 6d / 6e / 6f through the first signal trace 7, and the positive / negative pads 201a / 201b / 201c / 201d are connected to the other end of the corresponding positive / negative electrode 6a / 6b / 6c / 6d / 6e / 6f through the second signal trace 8, thereby realizing the electrical connection between the positive electrode 6a / 6c / 6e and the positive pad 201a, and the electrical connection between the negative electrode 6b / 6d / 6f and the negative pads 201b / 201c / 201d.

[0067] by Figure 10a and Figure 10bTaking the illustrated example, assume all light-emitting chips 203 are divided into three light-emitting groups, each group having one positive electrode 6a / 6c / 6e and one negative electrode 6b / 6d / 6f. In practical applications, considering that the voltage applied to the positive electrodes 6a / 6c / 6e of all light-emitting groups on the connecting board 202 is the same during the operation of the light strip 2, to reduce the number of effective pads 201, only one positive pad 201a can be set for the three positive electrodes 6a / 6c / 6e, meaning the three positive electrodes 6a / 6c / 6e are connected to the same positive pad 201a. For each negative electrode 6b / 6d / 6f, a corresponding negative pad 201b / 201c / 201d needs to be set, meaning the negative electrodes 6b / 6d / 6f correspond one-to-one with the negative pads 201b / 201c / 201d.

[0068] It should be noted that the above-mentioned case of multiple positive electrodes corresponding to one positive pad is only one optional solution in this invention and does not limit the technical solution of this invention.

[0069] Preferably, the auxiliary pads 204a / 204b are connected in parallel with the positive pad 201a. In this invention, by connecting the auxiliary pads 204a / 204b in parallel with the positive pad 201a, the equivalent resistance between the positive pad 201a and the positive electrode 6a / 6c / 6e can be effectively reduced, thereby ensuring accurate signal transmission. Specifically, when the auxiliary pads 204a / 204b are not connected in parallel with the positive pad 201a, the equivalent resistance between the positive pad 201a and the positive electrode 6a / 6c / 6e is the sum of the resistance of the positive pad 201a, the resistance of the second signal trace 8, and the resistance of the positive electrode 6a / 6c / 6e. When the auxiliary pads 204a / 204b are connected in parallel with the positive pad 201a, the equivalent resistance between the positive pad 201a and the positive electrode 6a / 6c / 6e is reduced because the equivalent resistance of the positive pad 201a and the auxiliary pads 204a / 204b in parallel is less than the resistance of the positive pad 201a.

[0070] It should be noted that, Figure 10b The method of first connecting the two auxiliary pads 204a / 204b in series via the second signal trace 8, and then connecting them in parallel with the positive pad 201a via the second signal trace 8, is only one optional solution in this invention. Figure 10bAlternatively, both auxiliary pads 204a / 204b can be directly connected in parallel with the positive pad 201a (the two auxiliary pads 204a / 204b are in parallel, but no corresponding drawings are provided for this case). Of course, the above two parallel connection techniques between auxiliary pads and the positive pad are merely illustrative and do not limit the technical solution of this invention. Those skilled in the art should understand that this invention does not limit the number of auxiliary pads, the number of positive pads, or the parallel connection method between the auxiliary pads and the positive pad (the auxiliary pads are directly connected in parallel with one or more positive pads, or multiple auxiliary pads are first connected in series and then in parallel with one or more positive pads). As long as at least one auxiliary pad is connected in parallel with at least one positive pad, it falls within the scope of protection of this invention. Specific examples will not be provided here.

[0071] Optionally, the light strip 2 is divided into at least one welding area 5, and the welding area 5 corresponds one-to-one with the fixing part 13 pre-set on the flexible circuit board 1; the effective solder pad 201 and the auxiliary solder pad 204 are both located in the welding area 5, and each welding area 5 is provided with at least one effective solder pad 201 and at least one auxiliary solder pad 204. For a detailed description of the welding area 5 on the light strip 2, please refer to the foregoing content, and it will not be repeated here.

[0072] Preferably, there are multiple welding areas 5. With a fixed number of pads (including effective pads 201 and auxiliary pads 204), by setting multiple welding areas 5 and distributing the pads to each welding area 5, the technical solution of the present invention can effectively reduce the length of the welding areas 5 compared with the prior art. This can, to a certain extent, prevent the part of the lamp strip 2 corresponding to the welding area 5 from being deformed by tensile force, thereby ensuring the uniformity of the overall luminous brightness of the lamp strip 2.

[0073] As a specific optional solution, the welding area 5 is provided with one auxiliary solder pad 204 and two effective solder pads 201. This ensures the firmness of the fixation between the welding area 5 and the corresponding fixing part 13, while also preventing the length of the welding area 5 from becoming excessive, thus avoiding deformation of the portion of the light strip 2 corresponding to the welding area 5. More preferably, the two effective solder pads 201 are located on both sides of the auxiliary solder pad 204, corresponding to the design in the flexible circuit board 1 where the two effective welding parts 101 on the fixing part 13 are located on both sides of the auxiliary welding part 102, thereby improving the reliability of the product.

[0074] Embodiment 1 of the present invention provides a flexible circuit board and a light strip. By adding auxiliary welding and corresponding auxiliary pads, the maximum tensile force that the flexible circuit board and the light strip can withstand can be increased, thereby avoiding the phenomenon of breakage at effective welding points. In addition, the design of multiple fixing parts and multiple welding areas can reduce the length of the welding area while ensuring the firmness of the fixing parts and welding areas, avoiding deformation of the corresponding welding area on the light strip due to tensile force, and thus ensuring the uniformity of the overall luminous brightness of the light strip.

[0075] Embodiment two of the present invention provides a light source. See also... Figures 4 to 6 As shown, the light source includes a flexible circuit board 1 and a light strip 2. The flexible circuit board 1 is used to fix the light strip 2 and provide signals to the light strip 2. The flexible circuit board 1 includes a plurality of effective solder parts 101 and at least one auxiliary solder part 102. The light strip 2 includes a plurality of effective pads 201 and at least one auxiliary pad 204. The effective solder parts 101 correspond one-to-one with the effective pads 201, and the auxiliary solder parts 102 correspond one-to-one with the auxiliary pads 204. The effective solder parts 101 are fixed to the corresponding effective pads 201 to transmit the signals they carry to the corresponding effective pads 201. The auxiliary solder parts 102 are fixed to the corresponding auxiliary pads 204 to strengthen the fixation between the flexible circuit board 1 and the light strip 2.

[0076] Optionally, the flexible circuit board 1 further includes: a circuit body 11, at least one lead-out portion 12 extending from the circuit body 11, and a fixing portion 13 corresponding to the lead-out portion 12. The fixing portion 13 is connected to the end of the corresponding lead-out portion 12. The effective soldering portion 101 and the auxiliary soldering portion 102 are both located on the corresponding fixing portion 13. Each fixing portion 13 is provided with at least one effective soldering portion 101 and at least one auxiliary soldering portion 102. The light strip 2 is divided into at least one soldering area 5. The soldering area 5 corresponds to the fixing portion 13. The effective solder pad 201 and the auxiliary solder pad 204 are both located in the soldering area 5. Each soldering area 5 is provided with at least one effective solder pad 201 and at least one auxiliary solder pad 204.

[0077] Preferably, there are multiple lead-out parts 12, that is, multiple fixing parts 13, and multiple welding areas 5 correspondingly provided on the lamp strip 2. When the number of solder pads on the lamp strip 2 is fixed, by setting multiple welding areas 5 and distributing the solder pads to each welding area 5, the technical solution of the present invention can effectively reduce the length of the welding area 5 compared with the prior art, thereby avoiding deformation of the part of the corresponding welding area 5 on the lamp strip 2 due to tensile force to a certain extent, and thus ensuring the uniformity of the overall light emission brightness of the lamp strip 2.

[0078] Preferably, on the fixing part 13, the distance between the auxiliary welding part 102, which is furthest from the end of the corresponding lead-out part 12, and the end of the corresponding lead-out part 12 is denoted as L1; the distance between the effective welding part 101, which is closest to the end of the corresponding lead-out part 12, and the end of the corresponding lead-out part 12 is denoted as L2; ​​wherein, L2 is greater than L1. In this invention, by setting the auxiliary welding part 102 closer to the end of the lead-out part 12 and setting the effective welding part 101 farther from the end of the lead-out part 12, the tensile force on the effective welding point can be reduced, thereby improving the reliability of the product.

[0079] Optionally, each fixing part 13 is provided with one auxiliary welding part 102 and two effective welding parts 101, and each welding area 5 is provided with one auxiliary solder pad 204 and two effective solder pads 201. In this case, while ensuring the firmness of the fixing between the welding area 5 and the corresponding fixing part 13, it is also possible to ensure that the length of the welding area 5 is not too long, thus avoiding deformation of the part of the lamp strip 2 corresponding to the welding area 5. More preferably, the end of the lead-out part 12 is connected to the middle position of the corresponding fixing part 13. The one auxiliary welding part 102 is located in the middle position of the fixing part 13, and the two effective welding parts 101 are respectively located on both sides of the one auxiliary welding part 102. The one auxiliary solder pad 204 is located in the middle position of the welding area 5, and the two effective solder pads 201 are respectively located on both sides of the one auxiliary solder pad 204, which can improve the reliability of the product.

[0080] Preferably, at least one of the effective pads 201 is a positive pad, and the auxiliary pad 204 is connected in parallel with the positive pad. In this invention, by connecting the auxiliary pad 204 in parallel with the positive pad, the equivalent resistance between the positive pad and the positive electrode can be effectively reduced, thereby ensuring accurate signal transmission.

[0081] It should be noted that for a more detailed description of the flexible circuit board 1 and the light strip 2 in this embodiment, please refer to the content of the aforementioned Embodiment 1, which will not be repeated here.

[0082] Embodiment 3 of the present invention provides a display device, which includes a light source, wherein the light source is the light source provided in Embodiment 2 above.

[0083] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A flexible circuit board for fixing to a light strip and providing signals to the light strip, the flexible circuit board comprising: The flexible circuit board includes several effective soldering parts, each effective soldering part being used to fix itself to a corresponding effective solder pad on the light strip and to transmit the signal it carries to the corresponding effective solder pad. The flexible circuit board further includes at least one auxiliary soldering part, which is used to fix itself to a corresponding auxiliary solder pad on the light strip to enhance the firmness of the fixation between the flexible circuit board and the light strip. The flexible circuit board further includes: a circuit body, at least one lead-out portion extending from the circuit body, and a fixing portion corresponding to each lead-out portion, wherein the fixing portion corresponds to each welding area provided on the light strip; The fixing part is connected to the end of the corresponding lead-out part. The effective welding part and the auxiliary welding part are both located on the fixing part. Each fixing part is provided with at least one effective welding part and at least one auxiliary welding part. The effective welding part and the auxiliary welding part are made of the same material.

2. The flexible circuit board according to claim 1, characterized in that, The number of the lead-out sections is multiple.

3. The flexible circuit board according to claim 1, characterized in that, On the fixing part, the distance between the auxiliary welding part that is furthest from the end of the corresponding lead-out part and the end of the corresponding lead-out part is denoted as L1; The effective weld portion that is closest to the end of the corresponding lead-out portion is denoted as L2. Among them, L2 is greater than L1.

4. The flexible circuit board according to any one of claims 1-3, characterized in that, The fixing part is provided with one auxiliary welding part and two effective welding parts, and the two effective welding parts are respectively located on both sides of the auxiliary welding part.

5. A light strip for fixing to a flexible circuit board as described in any one of claims 1-4 and receiving signals provided by the flexible circuit board, the light strip comprising: The light strip includes several effective pads, which are used to fix the light strip to corresponding effective solder parts on the flexible circuit board and to acquire signals transmitted by the corresponding effective solder parts. The light strip further includes at least one auxiliary pad, which is used to fix the light strip to corresponding auxiliary solder parts on the flexible circuit board to enhance the firmness of the fixation between the flexible circuit board and the light strip.

6. The light strip according to claim 5, characterized in that, The light strip is divided into at least one welding area, and the welding area corresponds one-to-one with the fixing part pre-set on the flexible circuit board. Both the effective pad and the auxiliary pad are located within the welding area, and each welding area is provided with at least one effective pad and at least one auxiliary pad.

7. The light strip according to claim 6, characterized in that, The number of welding areas is multiple.

8. The light strip according to claim 6 or 7, characterized in that, The welding area is provided with one auxiliary pad and two effective pads, with the two effective pads located on both sides of the one auxiliary pad.

9. The light strip according to claim 5, characterized in that, At least one of the valid pads is a positive pad; The auxiliary pad is connected in parallel with the positive electrode pad.

10. A light source, comprising: The flexible circuit board and the light strip as described in any one of claims 1-4, wherein the flexible circuit board is used to fix the light strip and provide signals to the light strip, the flexible circuit board includes: a plurality of effective soldering portions, the light strip includes: a plurality of effective pads, the effective soldering portions correspond one-to-one with the effective pads, the effective soldering portions are fixed to the corresponding effective pads, and are used to transmit the signals loaded on themselves to the corresponding effective pads, characterized in that the flexible circuit board further includes: at least one auxiliary soldering portion, the light strip further includes: at least one auxiliary pad, the auxiliary soldering portion corresponds one-to-one with the auxiliary pads, the auxiliary soldering portion is fixed to the corresponding auxiliary pads, and is used to strengthen the firmness of the fixation between the flexible circuit board and the light strip.

11. The light source according to claim 10, characterized in that, The flexible circuit board further includes: a circuit body, at least one lead-out portion extending from the circuit body, and a fixing portion corresponding to each lead-out portion. The fixing portion is connected to the end of the corresponding lead-out portion. The effective welding portion and the auxiliary welding portion are both located on the corresponding fixing portion. Each fixing portion is provided with at least one effective welding portion and at least one auxiliary welding portion. The light strip is divided into at least one welding area, and the welding area corresponds one-to-one with the fixing part. The effective solder pad and the auxiliary solder pad are both located in the welding area, and each welding area is provided with at least one effective solder pad and at least one auxiliary solder pad.

12. The light source according to claim 11, characterized in that, The number of the lead-out sections is multiple.

13. The light source according to claim 12, characterized in that, On the fixing part, the distance between the auxiliary welding part that is furthest from the end of the corresponding lead-out part and the end of the corresponding lead-out part is denoted as L1; The effective weld portion that is closest to the end of the corresponding lead-out portion is denoted as L2. Among them, L2 is greater than L1.

14. The light source according to any one of claims 11-13, characterized in that, The fixing part is provided with one auxiliary welding part and two effective welding parts, and the two effective welding parts are respectively located on both sides of the one auxiliary welding part; The welding area is provided with one auxiliary pad and two effective pads, with the two effective pads located on both sides of the one auxiliary pad.

15. The light source according to claim 10, characterized in that, At least one of the valid pads is a positive pad; The auxiliary pad is connected in parallel with the positive electrode pad.

16. A display device, characterized in that, include: The light source as described in any one of claims 10-15 above.

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