Backlight FPC and backlight module

Abstract

The utility model discloses a backlight FPC (Flexible Printed Circuit) and a backlight module, and relates to the field of display equipment, the backlight FPC comprises an FPC body, the back surface of the FPC body is provided with a line, and the back surface of the FPC body is provided with a copper leakage area in a blank area without the line; the backlight module comprises a backlight FPC and an iron frame, the backlight FPC is arranged on one side of the iron frame, the back face of the backlight FPC is fixedly attached to a bottom plate of the iron frame, and a graphite sheet is attached to the outer side face of the bottom plate of the iron frame. According to the utility model, the copper leakage area is arranged in the blank area of the back surface of the backlight FPC without circuit wiring, and the copper leakage area can quickly absorb heat at the heat dissipation part of the LED and quickly conduct the heat to the iron frame, so that the heat dissipation of the backlight module is accelerated, the working procedures are reduced, the production efficiency is high, and the manufacturing cost is low; according to the backlight module, the graphite sheet is attached to the iron frame, so that heat in the iron frame can be quickly dissipated, the overall heat dissipation capacity of the backlight module is improved, the iron frame is prevented from being heated in a concentrated mode to be hot, and normal work of the backlight module is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to display equipment technical field especially, and it relates to a kind of backlight FPC and backlight module. BACKGROUND

[0002] Nowadays, electronic products such as mobile phones have become the products that people rely on for their lives and work. People have increasingly high requirements for mobile phones, and a full-screen with a large screen size and narrow frame can better capture the trust of consumers. To design a narrow edge corresponding backlight, a flip structure needs to be used. Due to the large screen size and high brightness requirement, the number of LED lights on the backlight is also large. Therefore, the user is prone to heat when using the mobile phone for a long time. If the heat cannot be dissipated in time, it will affect the user experience and reduce the service life of the backlight module. The heat of the backlight mainly comes from the LED light. How to improve the heat dissipation effect of the LED on the backlight has become a problem that needs to be solved by major backlight manufacturers.

[0003] Chinese patent application No. CN201822126046.4 discloses a vehicle-mounted backlight module, which comprises a lower frame including a bottom plate, a light source and a light guide plate mounted on the bottom plate of the lower frame, and a reflector arranged above the light source to reflect the light emitted by the light source into the light guide plate. The light source includes an FPC and an LED light bar mounted on the FPC. The FPC includes an FPC body, and the upper surface of the FPC body is provided with a circuit layer. The lower surface of the FPC body is provided with a metal heat dissipation layer. A reflective layer is arranged on the circuit layer, and the circuit layer and the metal heat dissipation layer are attached to the FPC body by double-sided adhesive. Since the FPC body is thin, the heat generated by the light source can be diffused to the metal heat dissipation layer. The metal heat dissipation layer can effectively increase the heat dissipation area of the light source, play a uniform heat dissipation role, and improve the heat dissipation efficiency of the vehicle-mounted backlight module.

[0004] In the existing backlight module, the lower surface of the FPC body is provided with a metal heat dissipation layer, and the metal heat dissipation layers are connected to the lower frame. Although this structure design can increase the heat dissipation area and improve the heat dissipation efficiency, the metal heat dissipation layer increases the production cost on the one hand, and the adhesion of the metal heat dissipation layer also increases the assembly process, reduces the assembly efficiency, and the double-sided adhesive also affects the heat dissipation. At the same time, although this heat dissipation can dissipate heat to the bottom plate of the lower frame, it is difficult to quickly dissipate the heat in the bottom plate. Therefore, the utility model discloses a backlight FPC and backlight module to solve the above problems. UTILITY MODEL CONTENTS

[0005] Based on this, it is necessary to solve the above technical problems, provide a backlight FPC and backlight module, the blank area of the back of the backlight FPC wire layout is provided with a copper leakage area, the copper leakage area can quickly absorb the heat of the LED heat dissipation, the heat is quickly conducted to the iron frame, the heat dissipation of the backlight module is accelerated, meanwhile, the copper leakage area can be prepared with the wire layout on the back, reduce the process, high production efficiency, low manufacturing cost; Meanwhile, the graphite sheet is used in the backlight module and the iron frame is pasted, which can quickly dissipate the heat in the iron frame, improve the overall heat dissipation capacity of the backlight module, avoid the iron frame from being overheated after being heated, and ensure the normal work of the backlight module.

[0006] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0007] On the one hand, a backlight FPC is provided, which comprises a FPC body, a wire layout is arranged on the back of the FPC body, and a copper leakage area is arranged on the blank area of the wire layout on the back of the FPC body.

[0008] As a preferred embodiment of the backlight FPC provided by the utility model, the FPC body comprises a main body part, a connecting segment and a plug-in end which are integrally connected, the copper leakage area is arranged on the main body part, and the wire layout is distributed on the main body part, the connecting segment and the plug-in end.

[0009] As a preferred embodiment of the backlight FPC provided by the utility model, the connecting part of the main body part and the connecting segment is in an arc structure.

[0010] As a preferred embodiment of the backlight FPC provided by the utility model, the connecting part of the main body part and the connecting segment is provided with a tear-resistant strip, the tear-resistant strip is close to the arc structure, and the shape of the tear-resistant strip is consistent with the arc track of the arc structure.

[0011] On the other hand, a backlight module is provided, which comprises the above backlight FPC and an iron frame, the backlight FPC is arranged on one side of the iron frame, the back of the backlight FPC is fixedly attached to the bottom plate of the iron frame, and a graphite sheet is attached to the outer side of the bottom plate of the iron frame.

[0012] As a preferred embodiment of the backlight module provided by the utility model, the iron frame is sequentially stacked with a reflecting sheet, a light guide plate and an optical film material, the front of the backlight FPC is fixedly attached to the bottom of the light guide plate through double-sided adhesive.

[0013] As a preferred embodiment of the backlight module provided by the utility model, the upper side of the optical film material is provided with a light shielding adhesive layer, the light shielding adhesive layer is attached to the edge of the iron frame, and one end of the graphite sheet extends to the upper side of the iron frame along the side of the iron frame and is attached to the light shielding adhesive layer.

[0014] As a preferred embodiment of the backlight module provided by the utility model, the contact area of the graphite sheet and the upper bottom plate of the iron frame is larger than the contact area of the backlight FPC and the upper bottom plate of the iron frame, and the graphite sheet covers the contact area of the backlight FPC and the upper bottom plate of the iron frame.

[0015] As a preferred embodiment of the backlight module provided by the utility model, the back surface of the backlight FPC is fixedly bonded with the bottom plate of the iron frame through the heat-conducting adhesive.

[0016] As a preferred embodiment of the backlight module provided by the utility model, the planar size of the heat-conducting adhesive is not less than the contact area of the backlight FPC and the upper bottom plate of the iron frame.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1、the backlight FPC provided by the utility model sets the copper leakage area in the blank area of the wire routing on the back surface of the backlight FPC, the copper leakage area can quickly absorb the heat of the LED heat dissipation place, quickly conducts the heat to the iron frame, accelerates the heat dissipation of the backlight module, meanwhile, the copper leakage area can be prepared together with the wire routing on the back surface, reduces the working procedure, is high in production efficiency and low in manufacturing cost.

[0019] 2、the backlight module provided by the utility model adopts the graphite sheet and the iron frame to be attached, can quickly dissipate the heat in the iron frame, improves the heat dissipation capacity of the whole backlight module, avoids the iron frame from being overheated after being heated, and guarantees the normal work of the backlight module. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the scheme in the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without paying creative labor.

[0021] Figure 1 It is the back surface plane schematic view of the backlight FPC provided by the utility model;

[0022] Figure 2 It is the back surface plane schematic view of the backlight FPC provided by the utility model; Figure 1 It is the enlarged schematic view of A in the embodiment;

[0023] Figure 3 It is the overall structure schematic view of the backlight module provided by the utility model.

[0024] The mark in the drawing is as follows:

[0025] 1, FPC body; 101, main body part; 102, connecting section; 103, plug-in end; 104, arc structure; 105, tear-resistant strip; 2, circuit trace; 3, copper leakage area; 4, iron frame; 401, bottom plate; 5, LED lamp; 6, graphite sheet; 7, reflecting sheet; 8, light guide plate; 9, optical film material; 10, light shielding film; 11, light shielding adhesive layer; 12, heat-conducting adhesive; 13, double-sided adhesive. DETAILED DESCRIPTION

[0026] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0027] As described in the background, the backlight corresponding to the narrow side needs to adopt an inverted structure. Due to the large screen size and high brightness requirement, the number of LED lamps on the backlight is also large. Therefore, the user is prone to heat when using the mobile phone for a long time. If the heat cannot be dissipated in time, it will affect the user experience and also reduce the service life of the backlight module. The heat of the backlight mainly comes from the LED lamp. How to improve the heat dissipation effect of the LED on the backlight has become a problem that needs to be solved by major backlight manufacturers. In the existing backlight module, the lower surface of the FPC body is provided with a metal heat dissipation layer, and the metal heat dissipation layers are connected with the lower frame. Although this structure design can increase the heat dissipation area and improve the heat dissipation efficiency, on the one hand, the metal heat dissipation layer increases the production cost, and on the other hand, the adhesion of the metal heat dissipation layer also increases the assembly process, reduces the assembly efficiency, and the double-sided adhesive also affects the heat dissipation. At the same time, although this heat dissipation can dissipate heat to the bottom plate of the lower frame, it is difficult to quickly dissipate the heat in the bottom plate.

[0028] In order to solve this technical problem, the present application provides a backlight FPC which is applied to the field of backlight FPC.

[0029] Specifically, please refer to Figures 1-2 The backlight FPC includes an FPC body 1, the back surface of the FPC body 1 is provided with a circuit trace 2, and the back surface of the FPC body 1 is located in a blank area without a circuit trace 2 and is provided with a copper leakage area 3.

[0030] The utility model provides a backlight FPC, sets up the copper leakage area 3 in the blank area of the back surface wireless circuit wiring 2 of the backlight FPC, the copper leakage area 3 can quickly absorb the heat of LED heat dissipation, quickly conducts the heat to the iron frame 4, speeds up the heat dissipation of backlight module, and the copper leakage area 3 can be prepared with the back surface circuit wiring 2 simultaneously, reduces the procedure, and production efficiency is high, and the manufacturing cost is low.

[0031] To further solve the technical problem, the utility model provides a kind of backlight module, it is applied to display equipment field.

[0032] Specifically, please refer to Figure 3 , the backlight module it includes above-mentioned backlight FPC, still include iron frame 4, the backlight FPC is located in one side of iron frame 4 and the back surface of the backlight FPC is fixedly attached with the bottom plate 401 of iron frame 4, the bottom plate 401 outside surface of iron frame 4 is pasted with graphite sheet 6.

[0033] The utility model provides a backlight module, graphite sheet 6 is attached with iron frame 4 in the backlight module, can quickly dissipate the heat in iron frame 4, improves the heat dissipation capacity of backlight module whole, avoids iron frame 4 concentrated heating after scalding, guarantees the normal work of backlight module.

[0034] In order to make the personnel of this technical field better understand the utility model scheme, below will combine the drawings, and the technical scheme in the embodiment of the utility model is clearly and completely described.

[0035] It should be noted that, in the case of no conflict, the embodiments in the utility model and the features and technical solutions in the embodiments can be combined with each other.

[0036] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0037] Embodiment one

[0038] Please refer to Figures 1-2 , provide a kind of backlight FPC, it includes FPC body 1, copper foil is prepared to form circuit wiring 2 on the back surface of FPC body 1, meanwhile, the back surface of FPC body 1 is located in blank area of the copper leakage area 3 of wireless circuit wiring 2, after preparation, the back surface of FPC body 1 is located in the part outside copper leakage area 3 and is coated with a layer of insulating cover layer, the insulating layer can be green oil, also can be PI (polyimide) cover film, can also have both.

[0039] The FPC body 1 comprises a main body part 101, a connecting section 102 and a plug-in end 103, the front surface of the main body part 101 is used for mounting the LED lamp 5, the copper leakage area 3 is arranged on the main body part 101, and the circuit trace 2 is distributed on the main body part 101, the connecting section 102 and the plug-in end 103, the plug-in end 103 is connected with the connector on the main screen FPC, and the circuit trace 2 is used for connecting the circuit of each LED lamp 5.

[0040] The connecting part of the main body part 101 and the connecting section 102 is an arc-shaped structure 104, which enhances the strength of the connecting part and avoids the tearing problem of the connecting section 102 at the connecting part of the main body part 101 and the connecting section 102 when being bent. Further, the connecting part of the main body part 101 and the connecting section 102 is provided with a tear-proof strip 105, the tear-proof strip 105 is a copper foil strip, the tear-proof strip 105 is close to the arc-shaped structure 104, the shape of the tear-proof strip 105 is consistent with the arc-shaped track of the arc-shaped structure 104, the tear-proof strip 105 is two, which are respectively distributed at the positions of the two connecting parts of the main body part 101 and the connecting section 102, one end of the tear-proof strip 105 is fixedly connected with the main body part 101, the other end of the tear-proof strip 105 is fixedly connected with the connecting section 102, the setting of the tear-proof strip 105 further enhances the strength of the connecting part of the main body part 101 and the connecting section 102, plays a role in protecting the FPC body 1, reduces the circuit breaking, and thus achieves the effect of preventing tearing.

[0041] Embodiment two

[0042] Please refer to Figure 1 , 3 , provides a backlight module, which comprises the backlight FPC in embodiment one, the backlight module comprises an iron frame 4, the backlight FPC is arranged on one side of the iron frame 4 and the back surface of the backlight FPC is fixedly attached to the bottom plate 401 of the iron frame 4, the front surface of the backlight FPC is provided with the LED lamp 5, the outer side surface of the bottom plate 401 of the iron frame 4 is attached with a graphite sheet 6, the graphite sheet 6 is a single-sided graphite sheet 6, during assembly, the adhesive surface of the graphite sheet 6 is attached to the outer side surface of the bottom plate 401 of the iron frame 4, the heat generated by the LED lamp 5 on the backlight FPC is transmitted to the iron frame 4 through the copper leakage area 3, after the heat on the iron frame 4 is transmitted to the graphite sheet 6, the excellent lateral heat conduction performance of the graphite sheet 6 is utilized to promote heat dissipation and improve the heat dissipation capacity of the backlight module.

[0043] The reflector sheet 7, the light guide plate 8 and the optical film material 9 are sequentially stacked from bottom to top in the interior of the iron frame 4, one end of the backlight FPC extends into the bottom of the light guide plate 8 and the front surface of the backlight FPC is fixedly attached to the bottom surface of the light guide plate 8 through the double-sided adhesive 13, thereby enhancing the stability of the backlight FPC.

[0044] In this example, the optical film material 9 includes a diffusion film, a lower brightness enhancement film, and an upper brightness enhancement film stacked sequentially from bottom to top. The diffusion film is adhered to the upper surface of the light guide plate 8, and the end of the diffusion film near the LED lamp 5 extends out of the lower brightness enhancement film. The ends of the lower brightness enhancement film and the upper brightness enhancement film are flush to prevent light leakage from the iron frame 4 at the LED lamp 5. A light-shielding film 10 is provided above the LED lamp 5. The light-shielding film 10 is adhered to the part of the diffusion film that extends out of the lower brightness enhancement film. The light-shielding film 10 is black protective paper. The setting of the light-shielding film 10 solves the problem of local light leakage.

[0045] The upper side of the optical film material 9 is provided with a light-shielding adhesive layer 11, which is attached to the edge of the iron frame. One end of the graphite sheet 6 extends along the side of the iron frame 4 to the upper side of the iron frame 4 and is bonded to the light-shielding adhesive layer 11, so that the graphite sheet 6 has a U-shaped structure, which increases the contact surface between the graphite sheet 6 and the iron frame 4, so that the graphite sheet 6 can dissipate heat from the ends of the LED lamp 5 in the backlight module on three sides, which greatly improves the heat dissipation capacity. At the same time, the bonding between the graphite sheet 6 and the light-shielding adhesive layer 11 can fix the light-shielding adhesive layer 11 and prevent the end of the light-shielding adhesive layer 11 from lifting up and separating from the iron frame 4.

[0046] The contact area between the graphite sheet 6 and the upper base plate 401 of the iron frame 4 is larger than the contact area between the backlight FPC and the upper base plate 401 of the iron frame 4. Furthermore, the graphite sheet 6 covers the contact area between the backlight FPC and the upper base plate 401 of the iron frame 4, which further promotes the dissipation of heat in the iron frame 4 and enhances the heat dissipation capacity of the backlight.

[0047] Example 3

[0048] The backlight FPC and backlight module provided in Embodiment 2 are further optimized, specifically, as follows: Figure 3 As shown, the back of the backlight FPC is bonded and fixed to the base plate 401 of the iron frame 4 by thermally conductive adhesive 12. The planar size of the thermally conductive adhesive 12 is not smaller than the contact area between the backlight FPC and the base plate 401 of the iron frame 4. The thermally conductive adhesive 12 is thermally conductive silicone, thermally conductive double-sided adhesive, or graphite layer with adhesive layers on both sides. The thermally conductive adhesive 12 is used to quickly transfer the heat generated by the components on the backlight FPC and the LED lamp 5 to the iron frame 4, and together with the graphite sheet 6, it achieves the purpose of rapid heat dissipation.

[0049] The working principle of the backlight FPC and backlight module provided by this utility model is as follows: A copper leakage area 3 is set in the blank area without wiring trace 2 on the back of the backlight FPC. The copper leakage area 3 can quickly absorb the heat from the LED heat dissipation point and quickly conduct the heat to the iron frame 4, thereby accelerating the heat dissipation of the backlight module. At the same time, the copper leakage area 3 can be prepared together with the wiring trace 2 on the back, reducing the number of processes, increasing production efficiency, and reducing manufacturing costs. In the backlight module, a graphite sheet 6 is attached to the iron frame 4, which can quickly dissipate the heat in the iron frame 4, improve the overall heat dissipation capacity of the backlight module, prevent the iron frame 4 from overheating due to concentrated heat, and ensure the normal operation of the backlight module.

[0050] In the present application, unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise expressly limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] Obviously, the above-described embodiments are only a part of the embodiments of the present application, not all the embodiments, and the preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or equivalently replace some of the technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly used in other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A backlight FPC, comprising an FPC body, characterized in that, The back of the FPC body is provided with wiring traces. A copper drain area is set in the blank area on the back of the FPC body where there are no wiring traces. The FPC body includes an integrally connected main body, connecting section and plug terminal. The copper drain area is located in the main body, and the wiring traces are distributed in the main body, connecting section and plug terminal. The connection between the main body and the connecting section is an arc-shaped structure. A tear-resistant strip is provided at the connection between the main body and the connecting section. The tear-resistant strip is close to the arc-shaped structure and the shape of the tear-resistant strip is consistent with the arc trajectory of the arc-shaped structure.

2. A backlight module, characterized in that, Includes the backlight FPC as described in claim 1 and an iron frame, wherein the backlight FPC is disposed on one side of the iron frame and the back of the backlight FPC is attached and fixed to the bottom plate of the iron frame, and a graphite sheet is attached to the outer side of the bottom plate of the iron frame.

3. A backlight module according to claim 2, characterized in that, The iron frame contains a reflective sheet, a light guide plate, and an optical film, which are stacked in sequence. The front side of the backlight FPC is fixed to the bottom side of the light guide plate by double-sided adhesive.

4. A backlight module according to claim 3, characterized in that, The optical film has a light-shielding adhesive layer on its upper side, which is adhered to the edge of the iron frame. One end of the graphite sheet extends along the side of the iron frame to the upper side of the iron frame and is bonded to the light-shielding adhesive layer.

5. A backlight module according to claim 4, characterized in that, The contact area between the graphite sheet and the upper base plate of the iron frame is larger than the contact area between the backlight FPC and the upper base plate of the iron frame, and the graphite sheet covers the contact area between the backlight FPC and the upper base plate of the iron frame.

6. A backlight module according to claim 2, characterized in that, The back of the backlight FPC is bonded and fixed to the base plate of the iron frame with thermally conductive adhesive.

7. A backlight module according to claim 6, characterized in that, The planar dimensions of the thermally conductive adhesive are not less than the contact area between the backlight FPC and the upper base plate of the iron frame.

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