Flexible circuit board and display device

Abstract

The invention relates to a flexible circuit board and a display device. The flexible circuit board comprises a light sensing area, an attaching area and at least two connecting areas. The light sensing area is provided with a light sensing device. The attaching area is used for being attached to the backlight surface of the display module. The at least two connecting areas are distributed on the periphery of the light sensing area and are connected with the light sensing area and the attaching area. According to the invention, display light leakage caused by local upwarp of the flexible circuit board can be prevented.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a flexible circuit board and a display device. Background Art

[0002] With the continuous iteration of high-end electronic products, photosensitive devices have become an indispensable functional component of display products (especially wearable products such as watches).

[0003] After the existing flexible circuit board with a photosensitive device is attached to the display module, it is easy to partially warp up and cause the problem of display light leakage. Summary of the invention

[0004] Based on this, it is necessary to provide a flexible circuit board and a display device that can prevent local warping from causing display light leakage in order to solve the above technical problems.

[0005] A flexible circuit board, comprising:

[0006] A light sensing area is provided with a light sensing device;

[0007] An attachment area, used for attaching to a backlight surface of a display module;

[0008] At least two connection areas are distributed on the periphery of the light sensing area and connect the light sensing area and the attachment area.

[0009] In one embodiment, the at least two connection areas are evenly distributed around the periphery of the light sensing area.

[0010] In one embodiment, the connection zone includes a stretchable zone.

[0011] In one embodiment, the at least two connecting areas include at least one pair of stretchable areas, and each pair of stretchable areas includes two stretchable areas located on opposite sides of the photosensitive area and distributed in a centrally symmetrical manner.

[0012] In one embodiment, the stretchable region includes a bending region;

[0013] Preferably, the bending area includes a round-shaped bending area;

[0014] Preferably, the bending form of the meandering bending zone includes N-type, S-type, U-type or V-type.

[0015] In one embodiment, the structures on both sides of the bend of the meander-shaped bend zone include a groove or a cutting line.

[0016] In one of the embodiments, the bottom of the slot or the cut-off line includes a crack-stop hole.

[0017] In one embodiment, the attachment area includes at least one circuit board main body area, and the at least two connection areas are located between the same circuit board main body area and the light sensing area.

[0018] In one embodiment, the circuit board main area includes a first sub-area and second sub-areas located on both sides of the first sub-area, the first sub-area and the second sub-areas on both sides thereof are arranged to form a groove, and the light sensing area is located in the groove;

[0019] Preferably, the stretchable area is located between the photosensitive area and the second sub-areas on both sides thereof.

[0020] The above-mentioned flexible circuit board includes at least two connection areas. After the flexible circuit board is attached to the display module, each connection area can apply a pulling force to the light-sensitive area. At least two connection areas improve the force uniformity of the light-sensitive area, thereby preventing the flexible circuit board from partially warping and causing light leakage.

[0021] A display device, comprising:

[0022] Display module;

[0023] A cushioning layer, located on the backlight surface of the display module;

[0024] In the above-mentioned flexible circuit board, the light-sensing area is located on the surface of the padding layer away from the display module, and the attachment area is located on the backlight surface of the display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a partial top view schematic diagram of a conventional display device;

[0027] Figure 2 is a partial cross-sectional schematic diagram of a conventional display device;

[0028] Figure 3 is a partial top view schematic diagram of a display device in an embodiment of the present application;

[0029] Figure 4 is a partial cross-sectional schematic diagram of a display device in an embodiment of the present application;

[0030] Figure 5 is a partial top view schematic diagram of a display device in another embodiment of the present application;

[0031] Figure 6 for Figure 3 or Figure 5 A magnified schematic diagram of the middle A area;

[0032] Figure 7 is an enlarged schematic diagram of region A in another embodiment;

[0033] Figures 8 to 11 Schematic diagram of the connection area distribution in different embodiments.

[0034] Description of reference numerals:

[0035] 100-display module, 110-display panel, 111-substrate, 112-packaging layer, 120-polarizer, 130-optical adhesive, 140-cover plate, 150-buffer layer, 200-pad layer, 300-flexible circuit board, 310-photosensitive area, 310a-photosensitive device, 320-attachment area, 321-circuit board main area, 321a-components, 321b-battery, 3211-first sub-area, 3212-second sub-area, 330-connection area, 331-stretchable area, 10-grooving, 20-cutting line. DETAILED DESCRIPTION

[0036] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0038] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0039] In the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity. It is understood that when a layer or element is referred to as being "on" another layer or substrate, the layer or element may be directly on the other layer or substrate, or there may be intervening layers. In addition, it is also understood that when a layer is referred to as being "between" two layers, the layer may be the only layer between the two layers, or there may be one or more intervening layers. In addition, the same reference numerals always represent the same elements.

[0040] In the following embodiments, when a layer, region, or element is "connected", it can be interpreted that the layer, region, or element is not only directly connected but also connected through other constituent elements placed therebetween. For example, when a layer, region, element, etc. is described as being connected or electrically connected, the layer, region, element, etc. can be connected or electrically connected not only directly or directly, but also through another layer, region, element, etc. placed therebetween.

[0041] Hereinafter, although terms such as "first", "second", etc. may be used to describe various components, these components are not necessarily limited to the above terms. The above terms are only used to distinguish one component from another. It will also be understood that expressions used in the singular include plural expressions unless the expression in the singular has an obviously different meaning in the context.

[0042] When a statement such as "at least one (of)..." is located after a list of elements, it modifies the entire list of elements rather than the individual elements in the list. The term "and / or" as used herein includes any and all combinations of one or more related listed items. As used in the application documents, the term "and / or" includes any and all combinations of one or more related listed items. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0043] Electronic or electrical devices and / or any other related devices or components according to the embodiments of the concepts of the present application described herein (for example, a display device including a display panel and a display panel driver, wherein the display panel driver also includes a drive controller, a gate driver, a gamma reference voltage generator, a data driver, and an emission driver) can be implemented using any appropriate hardware, firmware (such as a dedicated integrated circuit), software, or a combination of software, firmware, and hardware. For example, the various components of these devices may be formed on an integrated circuit (IC) chip or on separate IC chips. In addition, the various components of these devices may be implemented on a flexible printed circuit film, a tape carrier package (TCP), a printed circuit board (PCB), or formed on a substrate. In addition, the various components of these devices may be processes or threads that run on one or more processors in one or more computing devices to execute computer program instructions and interact with other system components to perform the various functions described herein. The computer program instructions are stored in a memory that can be implemented in a computing device using standard storage devices (e.g., such as random access memory (RAM). The computer program instructions can also be stored in other non-transitory computer-readable media (e.g., such as CD-ROMs, flash drives, etc.). Moreover, those skilled in the art should recognize that the functions of various computing devices can be combined or integrated into a single computing device, or the functions of a particular computing device can be distributed on one or more other computing devices without departing from the spirit and scope of the exemplary embodiments of the concepts of the present application.

[0044] Although exemplary embodiments of display modules and display devices including display modules have been specifically described herein, many modifications and variations will be apparent to those skilled in the art. Therefore, it will be understood that display modules and display devices including display modules constructed according to the principles of the present application may be implemented in addition to those specifically described herein. The present application is also defined in the claims and their equivalents.

[0045] As mentioned in the background art, after the existing flexible circuit board is attached to the display module, it is easy to partially warp up and cause the problem of display light leakage. The inventor has found that the reason for this problem is:

[0046] See also Figure 1 as well as Figure 2When the flexible circuit board is attached to the display module, the side of the flexible circuit board provided with the photosensitive device 310a' faces the display module 100'. At the same time, the area of ​​the flexible circuit board provided with the photosensitive device 310a' (photosensitive area 310') is usually raised by a padding layer 200' (such as foam tape, etc.), so that the photosensitive device 310a' does not touch the display module 100'. After the flexible circuit board is attached to the display module 100', the photosensitive area 310' of the flexible circuit board is higher than the area attached to the display module (attachment area 320', usually the main area of ​​the circuit board with components). The photosensitive area 310' attached to the padding layer 200' is connected to the attachment area 320' through the connection area 330'. At this time, the photosensitive area is prone to uneven force, and the photosensitive area 310' is prone to warping and generating gaps, thereby causing light leakage problems.

[0047] Based on the above reasons, the present application provides a flexible circuit board and a display device that can prevent local warping from causing display light leakage.

[0048] In one embodiment, see Figure 3 as well as Figure 4 , a display device is provided, including a display module 100 , a cushioning layer 200 and a flexible circuit board 300 .

[0049] See also Figure 4 The display module 100 may include a display panel 110 , a polarizer 120 , a cover plate 140 , a buffer layer 150 , and the like.

[0050] The display panel 110 may include a substrate 111, a pixel circuit layer (not shown), a light-emitting device layer (not shown), and an encapsulation layer 112, etc. As an example, the substrate 111 of the display panel 110 may include a low-temperature polycrystalline silicon (LTPS) substrate. The pixel circuit layer may include a thin film transistor, a capacitor, etc. The thin film transistor may be formed based on a low-temperature polycrystalline silicon substrate, etc. The light-emitting device layer may include an anode, a light-emitting layer, and a cathode. The light-emitting device layer includes a plurality of sub-pixels of different colors (such as a red sub-pixel, a green sub-pixel, and a blue sub-pixel). The anodes of different sub-pixels may be set independently of each other. And different sub-pixels may share a cathode formed on the entire surface. The encapsulation layer 112 may cover the light-emitting device layer and the pixel circuit layer.

[0051] The polarizer 120 may be disposed on the encapsulation layer 112 of the display panel 110. The cover plate 140 may be adhered to the polarizer 120 by means of an optical adhesive 130 or the like.

[0052] The buffer layer 150 may be disposed on a side of the substrate 111 of the display panel 110 away from the cover plate 140. The material of the buffer layer 150 may include, but is not limited to, buffer foam or (polyethylene terephthalate) PET, etc. The buffer layer 150 may be provided with an opening. The opening is used to allow the light sensing device 310a to receive light from the display module 100.

[0053] The cushioning layer 200 can be connected to the buffer layer 150 of the display module 100. The material of the cushioning layer 200 can include but is not limited to foam tape. The foam tape can be attached to the buffer layer 150 of the display module 100. At the same time, the foam tape can have a receiving hole. The receiving hole can be used to place the photosensitive device 310a.

[0054] The flexible circuit board 300 extends from the backlight surface of the display module 100 to the surface of the elevating layer 200 away from the display panel 110. The area of ​​the flexible circuit board 300 located on the surface of the elevating layer 200 is provided with a photosensitive device 310a. The photosensitive device 310a is located in the receiving hole of the elevating layer 200. The elevating layer 200 can elevate and protect the photosensitive device 310a, so that the photosensitive device 310a will not touch the display module 100.

[0055] In one embodiment, a flexible circuit board 300 is provided. Figure 3 as well as Figure 4 The flexible circuit board 300 includes a light sensing area 310 , an attachment area 320 and at least two connection areas 330 .

[0056] The photosensitive area 310 is a region of the flexible circuit board 300 where a photosensitive device 310 a is disposed.

[0057] When the flexible circuit board 300 is bonded to the display module 100 to form a display device, the light-sensitive area 310 can be attached to the padding layer 200. The padding layer 200 can be, for example, a foam tape. The opposite sides of the padding layer 200 can be bonded to the backlight surface of the display module 100 (such as the surface of the buffer layer 150 away from the substrate 111) and the light-sensitive area 310 of the flexible circuit board 300, respectively.

[0058] The attachment area 320 is an area of ​​the flexible circuit board 300 for attaching to the backlight surface of the display module 100. Specifically, the attachment area 320 can be attached to the buffer layer 150 or other back structures of the display module 100 through the adhesive layer 400. The adhesive layer 400 can include but is not limited to double-sided adhesive.

[0059] The attachment area 320 may include at least one circuit board main area 321. The circuit board main area 321 is provided with circuit board components 321a and a battery 321b. When the flexible circuit board 300 is attached to the display module 100 to form a display device, the circuit board main area 321 is attached to the backlight surface of the display module 100.

[0060] Of course, the attachment area 320 may also include an attachment area that is only used for attachment to the display module 100 and is not used for arranging the components 321a and the battery 321b, etc. This application does not impose any limitation on this.

[0061] The connection area 330 connects the photosensitive area 310 and the attachment area 320. And at least two connection areas 330 are distributed on the periphery of the photosensitive area 310, so that the photosensitive area 310 can be subjected to forces in at least two directions, thereby improving the uniformity of the force on the photosensitive area 310. As an example, at least two connection areas can be evenly distributed on the periphery of the photosensitive area, so that the photosensitive area 310 is uniformly subjected to force. Of course, the distribution form of the at least two connection areas can also be different from this. For example, the photosensitive area 310 is a quadrilateral, and a connection area 330 can be provided on the periphery of the four edges of the photosensitive area 310. At this time, the connection areas 330 located on opposite sides are arranged in a centrally symmetrical manner, so that the photosensitive area 310 can be subjected to uniform force even if the four connection areas 330 are not evenly distributed.

[0062] At least two connection areas 330 make the light-sensing area 310 evenly stressed, that is, through force analysis, it can be obtained that the vector sum of the pulling force F of at least two connection areas 330 acting on the light-sensing area 310 is zero, or less than a preset range. The preset range is a range that can ensure that the light-sensing area 310 will not be partially warped, and can be actually set according to the actual product.

[0063] When the flexible circuit board 300 is bonded to the display module 100 to form a display device, each connection area 330 is bent and deformed, so that the light sensing area 310 can be attached to the surface of the padding layer 200 away from the display module 100 while the attachment area 320 is attached to the backlight surface of the display module 100.

[0064] In this embodiment, the flexible circuit board 300 includes at least two connection areas 330. After the flexible circuit board 300 is attached to the display module 100, each connection area 330 can apply a pulling force to the light sensing area 310. At least two connection areas 330 can improve the force uniformity of the light sensing area 310, thereby preventing the flexible circuit board 300 from partially warping and causing light leakage.

[0065] In one embodiment, see Figure 3 , the connecting area 330 includes a stretchable area 331.

[0066] As an example, the stretchable region 331 may include a bending region.

[0067] As an example, the bending area may include a meandering bending area. The bending form of the meandering bending area may include an N-type, an S-type, a U-type, or a V-type, etc. Of course, the bending area may also be in other irregular bending forms. Alternatively, the stretchable area 331 may also have other forms, such as a three-dimensional spiral shape or a spring shape or other regular and irregular arc or curve shapes, etc., as long as it can be stretched.

[0068] See also Figure 1 After long-term research, the inventors found that the connection area 330' of the traditional flexible circuit board 300' is usually a linear area. At this time, if the length of the connection area 330' between the attachment area 320' and the light-sensing area 310' is short, after the flexible circuit board 300' is attached to the display module 100', there will be a height difference between the attachment area 320' and the light-sensing area 310', which will cause the attachment area 320' near the connection area 330' to warp. Therefore, the connection area 330' of the traditional flexible circuit board 300' usually needs to be set longer, thereby occupying a larger circuit board space.

[0069] In this embodiment, the connection area 330 is set as a stretchable area 331. The stretchable area 331 is in a contracted state when the flexible circuit board 300 is not attached, thereby effectively reducing the length between the light sensing area 310 and the attachment area 320 occupied by the connection area 330, and reducing the space of the flexible circuit board 300 occupied by the connection area 330.

[0070] At the same time, the periphery of the photosensitive area 310 is connected to multiple stretchable areas 331, so that a single stretchable area 331 can be designed to have a smaller line width. Specifically, when only one stretchable area 331 is set on a single side of the photosensitive area 310, in order to meet the electrical connection requirements, its line width can be W. When n stretchable areas 331 are set on the periphery of the photosensitive area 310, its line width can be W / n. For example, when 2 stretchable areas 331 are set on the periphery of the photosensitive area 310, its line width can be W / 2. When 3 stretchable areas 331 are set on the periphery of the photosensitive area 310, its line width can be W / 3. When 4 stretchable areas 331 are set on the periphery of the photosensitive area 310, its line width can be W / 4.

[0071] Therefore, the periphery of the light sensing area 310 is connected to a plurality of stretchable areas 331 , thereby further reducing the length between the light sensing area 310 and the attachment area 320 occupied by a single stretchable area 331 .

[0072] Also, see Figure 1 as well as Figure 2After long-term research, the inventors found that the conventional flexible circuit board 300' connects the light-sensitive area 310' with the attachment area 320' (such as the circuit board main area 321) through a linear connection area 330' located on one side (such as the left side) of the light-sensitive area 310'. When the flexible circuit board 300' and the display module 100' are bonded to form a display device, the attachment area 320' (such as the circuit board main area) needs to be bonded first. Then the connection area 330' is bent and deformed to raise the light-sensitive area 310'. Then the light-sensitive area 310' is bonded.

[0073] During this process, after the connection area 330' is bent and deformed, its orthographic projection length on the display module 100' will be shortened. Therefore, the position of the light sensing area 310' and the light sensing device 310a' disposed thereon is horizontally moved to the left. Therefore, before attaching the light sensing area 310', the light sensing device 310a' needs to be repositioned to ensure that the position of the light sensing device 310a' is accurate.

[0074] In this embodiment, the light-sensing area 310 and the attachment area 320 (such as the circuit board main body area 321) are connected through the stretchable area 331 (connection area 330). When the flexible circuit board 300 and the display module 100 are bonded to form a display device, the light-sensing area 310 and the attachment area 320 can be bonded at the same time, and the stretchable area 331 can be stretched while bonding. At this time, when the light-sensing area 310 is raised, the length of the positive projection of the stretchable area 331 on the display module 100 can be guaranteed to remain unchanged. At the same time, each stretchable area 331 is distributed on the periphery of the light-sensing area 310, so that each stretchable area 331 can have a pulling force on the light-sensing area 310, so that the light-sensing device 310a on the light-sensing area 310 will not move in the horizontal direction, so that there is no need to perform secondary alignment of the light-sensing device 310a after the flexible circuit board 300 is attached. Therefore, this embodiment can improve the alignment accuracy and improve the working efficiency.

[0075] At the same time, by configuring the connection area 330 to include the stretchable area 331 , the stretching degree of the stretchable area 331 can be controlled to meet the attachment requirements of the photosensitive devices 310 a of different heights.

[0076] In one embodiment, see Figure 3 The attachment area 320 includes at least one circuit board main body area 321. At least two connection areas 330 are located between the same circuit board main body area 321 and the light sensing area 310. The connection area 330 is a stretchable area 331.

[0077] As an example, the flexible circuit board 300 may include a circuit board main body area 321 , a light sensing area 310 , and at least two connection areas 330 located therebetween.

[0078] When at least two connection areas 330 are disposed between the main area 321 of the same circuit board and the light-sensing area 310, when the flexible circuit board 300 is attached to the display module 100 to form a display device, the light-sensing area 310 needs to be raised, and each connection area 330 will be bent and deformed. At this time, if each connection area 330 is a non-retractable area (such as a linear area), after each connection area 330 is bent and deformed, the length of its positive projection on the display module 100 will be shortened, so that each connection area 330 will apply a pulling force toward the light-sensing area 310 to the main area 321 of the same circuit board, so that the main area 321 of the circuit board will be deformed.

[0079] By setting the connection area 330 as the stretchable area 331, when the flexible circuit board 300 is attached to the display module 100 to form a display device, each connection area 330 can be stretched, and when the light sensing area 310 is raised, the orthographic projection length of each connection area 330 on the display module 100 can be guaranteed to remain unchanged, so that the shape of the circuit board main area 321 can remain unchanged. At this time, the circuit board components 321a on the circuit board main area 321 can be accurately positioned.

[0080] Of course, in other implementations, different connection areas 330 may also be located between different attachment areas 320 and light sensing areas 310. Among them, different attachment areas 320 may include different circuit board main body areas 321, or may include circuit board main body areas 321 and adhesive areas used only for attachment to the display module 100. And when different connection areas 330 are located between different attachment areas 320 and light sensing areas 310, the connection areas 330 may include stretchable areas 331, or may include other forms of areas, which may be specifically set according to actual needs, and the present application does not limit this.

[0081] In one embodiment, see Figure 3 as well as Figure 5 The circuit board main area 321 includes a first sub-area 3211 and second sub-areas 3212 located on both sides of the first sub-area 3211. The first sub-area 3211 and the second sub-areas 3212 on both sides thereof are arranged to form a groove, the light-sensing area 310 is located in the groove, and the stretchable area 331 is located between the light-sensing area 310 and the second sub-areas 3212 on both sides thereof.

[0082] At this time, the connection area 330 does not need to be set at the location of the first sub-area 3211, so that more space can be saved to place components 321a and batteries 321b (see Figure 5 ).

[0083] In one embodiment, at least two connecting regions 330 include one or more pairs of stretchable regions 331. Each pair of stretchable regions 331 includes two stretchable regions 331. The two stretchable regions 331 are located at opposite sides of the light sensing region 310 and are centrally symmetrically distributed.

[0084] As an example, see Figure 3 or Figure 5 , the light sensing area 310 may be a regular quadrilateral. A pair of stretchable areas 331 may be provided on opposite sides of the light sensing area 310 in the horizontal direction and are centrally symmetrically distributed. In this case, the pair of stretchable areas 331 may be located on the center line of the light sensing area 310 (eg Figure 3 or Figure 5 As shown), they may also be located on both sides of the center line of the photosensitive area 310 (not shown), so that the length of the stretchable area 331 in the vertical direction can be adjusted, thereby improving its stretching ability, so as to adapt to a higher height photosensitive device 310a.

[0085] As another example, see Figures 8 to 10 , the circuit board main body area 321 surrounds the light sensing area 310, and the light sensing area 310 can be a regular quadrilateral. Figure 8 A pair of stretchable areas 331 may be provided on opposite sides of the light sensing area 310 in the horizontal direction and are symmetrically distributed. Alternatively, see Fig. 9 A pair of stretchable areas 331 are provided on opposite sides of the light sensing area 310 in the vertical direction and are symmetrically distributed. Alternatively, see Fig.10 A pair of stretchable areas 331 are provided on opposite sides of the light sensing area 310 in the horizontal direction and are symmetrically distributed with respect to the center, and a pair of stretchable areas 331 are provided on opposite sides of the light sensing area 310 in the vertical direction and are symmetrically distributed with respect to the center.

[0086] Understandably, Figures 8 to 10 In order to highlight the distribution of the stretchable area 331 (connection area 330 ), the stretchable area 331 is represented by a black square, and the specific structure of the stretchable area 331 is not drawn.

[0087] In other examples, the light sensing area 310 may be in other shapes, such as other regular polygons (such as a regular hexagon, a regular octagon, etc.).

[0088] In this embodiment, at least two connecting areas 330 can be effectively realized by at least one pair of stretchable areas 331 located at opposite sides of the light-sensitive area 310 and distributed in a centrally symmetrical manner, so that the light-sensitive area 310 is subjected to uniform force.

[0089] Of course, the method of realizing at least two connection areas 330 so that the light sensing area 310 is subjected to uniform force is not limited to this. Fig.11, the light sensing area 310 may be circular. The at least two connection areas 330 may include three connection areas 330 each of which is 120 degrees apart. At this time, connecting the three connection areas 330 may also make the light sensing area 310 evenly stressed.

[0090] In one embodiment, see Figure 6 The stretchable area 331 includes a round-shaped bending area. The structures on both sides of the round-shaped bending area include a slot 10. The slot 10 separates the structures on both sides thereof, so that the stretchable area 331 can be stretched when the flexible circuit board 300 is attached.

[0091] For example, Figure 6 In the embodiment, the structures on both sides of the bend A are structure a and structure b. A slot 10 is included between structure a and structure b. The slot 10 separates the structures a and b on both sides thereof. For another example, Figure 6 In the embodiment, the structures on both sides of the bend B are structure a and structure c. A slot 10 is included between structure a and structure c. The slot 10 separates the structures a and c on both sides thereof.

[0092] As an example, the bottom of the slot 10 includes a crack-stopping hole 30. The crack-stopping hole 30 may be in communication with the slot 10, thereby preventing cracks from being generated near the bottom of the slot 10 when the stretchable region 331 is stretched.

[0093] In one embodiment, see Figure 7 The stretchable area 331 includes a round-shaped bending area. A cutting line 20 is provided between the structures on both sides of the bending of the round-shaped bending area. The cutting line 20 cuts off the structures on both sides thereof, so that the stretchable area 331 can be stretched when the flexible circuit board 300 is attached.

[0094] For example, Figure 7 In the embodiment, the structures on both sides of the bend A' are structure a' and structure b'. A cutting line 20 is included between the structure a' and the structure b'. The cutting line 20 separates the structures a' and b' on both sides. Figure 6 In the embodiment, the structures on both sides of the bend B' are structure a' and structure c'. A cutting line 20 is included between the structure a' and the structure c'. The cutting line 20 separates the structures a' and c' on both sides.

[0095] The cutting line method can save part of the space occupied by the slot width on the one hand, and reduce the production difficulty of FPC manufacturers on the other hand.

[0096] As an example, the bottom of the cutoff line 20 includes a crack-stopping hole 30. The crack-stopping hole 30 may be communicated with the cutoff line 20, thereby preventing cracks from being generated near the bottom of the cutoff line 20 when the stretchable region 331 is stretched.

[0097] It can be understood that the display device in the embodiments of the present application can be an OLED display device, a QLED display device, electronic paper, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, a wearable device, an Internet of Things device, or any other product or component with a display function, and the embodiments disclosed in the present application are not limited to this.

[0098] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0099] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A flexible circuit board, characterized in that: include: A light sensing area is provided with a light sensing device; An attachment area, used for attaching to a backlight surface of a display module; At least two connection areas are distributed on the periphery of the light sensing area and connect the light sensing area and the attachment area.

2. The flexible circuit board according to claim 1, characterized in that: The at least two connection areas are evenly distributed around the periphery of the light sensing area.

3. The flexible circuit board according to claim 1, characterized in that: The connection region includes a stretchable region.

4. The flexible circuit board according to claim 1, characterized in that: The at least two connecting areas include at least one pair of stretchable areas, and each pair of stretchable areas includes two stretchable areas located on opposite sides of the photosensitive area and distributed in a centrally symmetrical manner.

5. The flexible circuit board according to claim 3, characterized in that: The stretchable area includes a bending area; Preferably, the bending area includes a round-shaped bending area; Preferably, the bending form of the meandering bending zone includes N-type, S-type, U-type or V-type.

6. The flexible circuit board according to claim 5, characterized in that: The structures on both sides of the bend of the round-shaped bend zone include a slot or a cut line.

7. The flexible circuit board according to claim 6, characterized in that: The bottom of the slot or the cut-off line includes a crack-stop hole.

8. The flexible circuit board according to claim 3, characterized in that: The attachment area includes at least one circuit board main body area, and the at least two connection areas are located between the same circuit board main body area and the light sensing area.

9. The flexible circuit board according to claim 8, characterized in that: The circuit board main body area includes a first sub-area and second sub-areas located on both sides of the first sub-area, the first sub-area and the second sub-areas on both sides thereof are surrounded by a groove, and the light sensing area is located in the groove; Preferably, the stretchable area is located between the photosensitive area and the second sub-areas on both sides thereof.

10. A display device, characterized in that: include: Display module; A cushioning layer, located on the backlight surface of the display module; In the flexible circuit board according to any one of claims 1 to 9, the light-sensitive area is located on a surface of the pad layer away from the display module, and the attachment area is located on a backlight surface of the display module.

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