CN216718865U

CN216718865U - Display device

Info

Publication number: CN216718865U
Application number: CN202220165053.9U
Authority: CN
Inventors: 张楠楠; 庞震华; 李富琳
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2022-01-20
Filing date: 2022-01-20
Publication date: 2022-06-10
Anticipated expiration: 2032-01-20

Abstract

The utility model discloses a display device, comprising: display panel and backlight unit. The backlight module comprises a lamp panel, wherein a flexible circuit is bound on the light emitting side of the lamp panel and used for connecting adjacent lamp panels, control panels of display devices or adapter plates of the display devices. The lamp plate replaces sinking the terminal and is used for the circuit transmission through binding FPC to make and bind FPC position department and all allow the design of walking all around, can increase the subregion number that the lamp plate that adopts the individual layer circuit can realize from this.

Description

Display device

Technical Field

The utility model relates to the technical field of display, in particular to a display device.

Background

The Mini LED (Mini Light Emitting Diode, abbreviated as Mini LED) is used as a backlight source in liquid crystal display, which can greatly improve the existing liquid crystal display effect, not only realize thinning of backlight, but also realize more refined Dynamic control, improve the Dynamic contrast of liquid crystal display, and achieve better High-Dynamic Range (HDR) display effect.

The large-size direct type backlight module adopts a splicing mode of a plurality of Mini LED lamp panels to provide backlight, for example, a 65-inch display device needs at least 2 × 4 lamp panels for splicing, and the main reason is that the lamp panels are too large in size, so that the problems of serious expansion and shrinkage of the circuit board plates, low precision of bonding pads and the like can occur.

In order to reduce cost, the lamp panel usually can adopt the design of individual layer circuit as far as, because the lamp panel needs to be connected with the control panel, the lamp panel of individual layer circuit need set up connecting terminal, adopts the sunken mode of opening again to set up the socket that is used for connecting the winding displacement at the back of lamp panel. This just makes the circuit of lamp plate opening position unable continuous, and only a side can set up the circuit, and other three sides can't design and walk the line, have restricted the lamp plate to realize more partitions.

SUMMERY OF THE UTILITY MODEL

In some embodiments of the utility model, a display device includes: display panel and backlight unit. Backlight unit includes the lamp plate, and flexible circuit is bound to the light-emitting side of lamp plate for connect adjacent lamp plate, display device's control panel or display device's keysets. The lamp panel replaces the terminal of sinking to be used for the circuit transmission through binding FPC to make and bind FPC position department and all allow the design of walking all around, can increase the subregion number that the lamp panel that adopts the individual layer circuit can realize from this.

In some embodiments of the utility model, the lamp panel can be directly connected with the control panel of the display device by binding the flexible circuit board, so that the lamp panel can be controlled by the control panel to be lightened.

In some embodiments of the utility model, if the line between the lamp panel and the control panel is long, the lamp panel can be connected to the adapter plate by binding the flexible circuit board, and then the adapter plate is connected to the control panel by the flexible flat cable.

In some embodiments of the present invention, the large-sized display device may include a plurality of lamp panels, the plurality of lamp panels are spliced with each other, so that at least two adjacent lamp panels may be connected with each other by the binding flexible circuit board, and at this time, one of the two lamp panels may be connected with the control board, and the lamp panel may still be connected with the control board by the binding flexible circuit board, thereby avoiding punching the lamp panels and simplifying the circuit connected to the control board.

In some embodiments of the present invention, the lamp panel includes: a circuit board and a light source positioned above the circuit board. The circuit board comprises a substrate, a circuit layer and a solder mask layer. In order to control the cost, a single-layer board is formed by providing a wiring layer only on one side of a substrate. The solder mask layer comprises a plurality of windows for exposing a first bonding pad and a second bonding pad, the first bonding pad is used for welding a power supply, and the second bonding pad is used for binding the flexible circuit board.

In some embodiments of the present invention, the light source is a Mini LED. Because the Mini LED has a small size, the dynamic light emission of the backlight module is favorably controlled to be smaller in subareas, and the dynamic contrast of the picture is improved. The chip size of a single Mini LED is at least one side smaller than 500 μm.

In some embodiments of the utility model, the flexible circuit board is bound at the edge of the lamp panel, and the second bonding pad is arranged at the edge of the lamp panel, so that the problem of shielding the light source can be avoided.

In some embodiments of the utility model, as the number of the light sources increases, the spacing between the light sources is reduced, the width of the edge of the lamp panel is only half of the spacing between the light sources, and at this time, the space at the edge of the lamp panel may not be enough to set the second bonding pad.

In some embodiments of the utility model, the two ends of the flexible circuit board are both provided with the golden fingers, and after the golden fingers at one end of the flexible circuit board are bound with the second bonding pads, the flexible circuit board can be electrically connected with the lamp panel.

In some embodiments of the utility model, the flexible circuit board is located in an area covering a part of the light source in the orthographic projection of the lamp panel. In order to avoid the flexible circuit board from shielding the light source to emit light, an opening is arranged at the position of the flexible circuit board corresponding to the light source, and the opening can expose the light source so as to enable the light source to emit light smoothly.

In some embodiments of the utility model, except for the binding position, the local or whole back glue of the contact area of the flexible circuit board and the lamp panel is attached to the surface of the lamp panel, so that the flexible circuit board is prevented from shading a light source due to unevenness or tilting.

In some embodiments of the present invention, the openings of the flexible circuit board correspond to the light sources one-to-one, and one light source is disposed in one opening. The openings of the flexible circuit board correspond to the light sources one by one, and the flexible circuit board can be utilized to the maximum extent for wiring.

In some embodiments of the utility model, the light sources on the lamp panel are arranged in an array along a first direction and a second direction, and the first direction and the second direction are crossed. One opening of the flexible circuit board corresponds to at least two light sources, and the at least two light sources are arranged in the opening to reduce the number of the openings of the flexible circuit board.

In some embodiments of the present invention, the opening of the flexible circuit board is a bar-shaped opening extending along the first direction, and a plurality of light sources arranged in a line are disposed in one bar-shaped opening; or the opening of the flexible circuit board is a strip-shaped opening extending along the second direction, and a plurality of light sources arranged in a line are arranged in one strip-shaped opening. The flexible circuit board adopts the opening shape, so that the arrangement number of the openings can be reduced, and the manufacturing process is simplified.

In some embodiments of the present invention, the flexible circuit board includes only one opening, and all the light sources corresponding to the region where the flexible circuit board is located are disposed in the opening. The flexible circuit board is only provided with one opening, so that the manufacturing difficulty of the flexible circuit board can be simplified to the maximum extent, and meanwhile, the flexible circuit board can be prevented from shielding the light source to the maximum extent.

In some embodiments of the utility model, the solder resist layer on the surface of the circuit board can be made of a reflective material, so that the light-emitting surface of the lamp panel has a reflective property, and the surface of the flexible circuit board, which is away from one side of the lamp panel, is provided with the reflective layer or the reflective sheet, so that the reflective effect of each position of the lamp panel is consistent.

In some embodiments of the present invention, the backlight module further comprises: the reflector plate is positioned on the light emergent surface of the lamp panel and covers the lamp panel and the flexible circuit board on the lamp panel; the reflective sheet includes a plurality of openings for exposing the light sources. Because the thickness of flexible circuit board is very little, consequently can set up the reflector plate on the surface of lamp plate and flexible circuit board, carry out the trompil in order to expose the light source to the reflector plate, be favorable to improving the utilization ratio of light source.

In some embodiments of the present invention, if the size of the opening of the reflector plate is larger than the size of the opening of the flexible circuit board, the edge of the opening of the flexible circuit board is exposed, and in order to make the reflection effect consistent, a reflective layer may be disposed on the surface of the flexible circuit board exposed by the opening of the reflector plate, or a reflective layer may be disposed on all surfaces of the flexible circuit board, so that the reflection effect at each position is consistent.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention;

fig. 2 is a perspective view schematically illustrating a display device in the related art;

FIG. 3 is a schematic plan view of a lamp panel in the related art;

FIG. 4 is a schematic side view of a lamp panel in the related art;

fig. 5 is a schematic plan view of a lamp panel according to an embodiment of the present invention;

fig. 6 is a schematic side view of the lamp panel according to the embodiment of the present invention;

fig. 7 is a schematic cross-sectional structure view of the lamp panel according to the embodiment of the present invention;

fig. 8 is a second schematic plan view of the lamp panel according to the embodiment of the present invention;

fig. 9 is a schematic plan view of a flexible circuit board according to an embodiment of the present invention;

fig. 10 is a second schematic plan view illustrating a flexible circuit board according to an embodiment of the present invention;

fig. 11 is a third schematic plan view illustrating a flexible circuit board according to an embodiment of the present invention;

fig. 12 is a fourth schematic plan view of a flexible circuit board according to an embodiment of the present invention;

fig. 13 is a third schematic plan view of the lamp panel according to the embodiment of the present invention;

fig. 14 is a fourth schematic plan view of the lamp panel according to the embodiment of the present invention.

The backlight module comprises a backlight module 100, a display panel 200, a lamp panel 1, a backboard 2, a diffuser plate 3, an optical diaphragm 4, a reflector 5, a light source 11, a sinking terminal 12, a circuit board 13, a backboard opening 21, a first welding disc s1, a second welding disc s2, a flexible circuit board f, an x-golden finger, a k1 opening, a k2 opening, a substrate 131, a circuit layer 132, a solder mask 133, a solder mask w1 and a reflective layer w 2.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words expressing the position and direction described in the present invention are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the present invention. The drawings of the present invention are for illustrative purposes only and do not represent true scale.

The liquid crystal display mainly comprises a backlight module and a liquid crystal display panel. The liquid crystal display panel does not emit light, and brightness display needs to be realized by a light source provided by the backlight module.

The display principle of the liquid crystal display is that liquid crystal is placed between two pieces of conductive glass, and the electric field effect of liquid crystal molecule distortion is caused by the driving of an electric field between two electrodes so as to control the transmission or shielding function of a backlight source, thereby displaying an image. If a color filter is added, a color image can be displayed.

Fig. 1 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention.

As shown in fig. 1, the display device includes: the backlight module 100 is used for providing backlight to the display panel 200, and the display panel 200 is used for displaying images.

The backlight module 100 is generally disposed at the bottom of the display device, and has a shape and size corresponding to those of the display device. When applied to the field of televisions or mobile terminals, the backlight module generally takes a rectangular shape.

The backlight module in the embodiment of the utility model adopts the direct type backlight module, is used for uniformly emitting light rays in the whole light emitting surface, and provides light rays with sufficient brightness and uniform distribution for the display panel, so that the display panel can normally display images.

The display panel 200 is located at the light-emitting side of the backlight module 100, and the shape and size of the display panel are generally matched with those of the backlight module. The display panel 200 may be generally configured in a rectangular shape, and includes a top side, a bottom side, a left side and a right side, wherein the top side is opposite to the bottom side, the left side is opposite to the right side, the top side is connected to one end of the left side and one side of the right side, respectively, and the bottom side is connected to the other end of the left side and the other end of the right side, respectively.

The display panel 200 is a transmissive display panel, which can modulate the transmittance of light, but does not emit light by itself. The display panel 200 has a plurality of pixel units arranged in an array, and each pixel unit can independently control the transmittance and color of light incident to the pixel unit from the backlight module 100, so that the light transmitted by all the pixel units forms a displayed image.

Fig. 2 is a perspective view schematically illustrating a display device in the related art.

As shown in fig. 2, the backlight module 100 includes: lamp panel 1, backplate 2, diffuser plate 3 and optical diaphragm 4.

The back plate 2 is located at the bottom of the backlight module and has supporting and bearing functions. The back plate 2 is typically a square structure, the shape of which, when applied to a contoured display device, adapts to the shape of the display device. The back panel 2 includes a day side, a ground side, a left side, and a right side. Wherein the antenna side is opposite to the ground side, the left side is opposite to the right side, the antenna side is connected with one end of the left side and one side of the right side respectively, and the ground side is connected with the other end of the left side and the other end of the right side respectively.

The material of the back plate 2 is aluminum, iron, aluminum alloy or iron alloy. The backboard 2 is used for supporting the lamp panel 1 and supporting and fixing edge positions of the diffusion plate 3, the optical diaphragm 4 and other components, and the backboard 2 also plays a role in heat dissipation for the lamp panel 1.

In the embodiment of the utility model, the backlight module is a direct type backlight module, and the lamp panel 1 is positioned on the back panel 2. In general, the lamp panel 1 may be square or rectangular, with a length of 200mm-1200mm and a width of 100mm-600 mm.

According to display device's size can set up a plurality of lamp plates 1, provides backlight through the concatenation mode jointly between the lamp plate 1. For example, a 65-inch display device requires at least 2 × 4 lamp panels 1 to be assembled. In order to avoid the optical problem that lamp plate 1 concatenation brought, accomplish as far as possible lessly for the piece between the adjacent lamp plate 1, realize seamless concatenation even.

Lamp plate 1 compares in side income formula backlight unit and adopts the lamp strip as the backlight in lamp plate 1 has higher luminance, at the dynamic control of cooperation subregion, can promote display device's dynamic contrast.

Diffuser plate 3 is located the light-emitting side of lamp plate, and with the lamp plate between at a distance of certain distance. The setting of this distance is in order to make can fully mix the light between the light source on the lamp plate. The diffusion plate 3 functions to scatter incident light, so that the light passing through the diffusion plate 3 is more uniform.

The diffusion plate 3 is provided with scattering particle materials, and light rays are incident to the scattering particle materials and can be refracted and reflected continuously, so that the effect of scattering the light rays is achieved, and the effect of light uniformization is achieved. The thickness of the diffusion plate is generally set to be 1.5mm-3mm, and the larger the thickness of the diffusion plate is, the higher the haze is, and the better the uniform effect is.

The diffuser plate 3 may be processed by an extrusion process, and the material of the diffuser plate 3 is generally at least one selected from the group consisting of PMMA, PC, PS, and PP.

In the embodiment of the present invention, the lamp panel 1 may be configured to emit blue light. At this time, the diffusion plate 3 may be a quantum dot diffusion plate for implementing a color conversion and diffusion function.

The optical film 4 is located on one side of the diffusion plate departing from the lamp panel 1. The optical film 4 is dimensioned to fit the display device, is slightly smaller than the display device, and is usually rectangular or square.

In specific implementation, the optical film 4 includes one or a combination of several of a fluorescent film, a quantum film, a prism sheet, a brightness enhancement film, etc., and is disposed according to specific needs, which is not limited herein.

As shown in fig. 2, in the related art, the lamp panel 1 generally needs to be connected to a control board (not shown) of the display device, and the control board can control each lamp panel 1. The lamp panel 1 and the control panel are connected by a Flexible Flat Cable (FFC for short). At present lamp plate 1 need adopt connecting terminal to connect the FFC, need punch at lamp plate 1 under some circumstances for the socket of connecting the FFC sinks, this connecting terminal is terminal 12 that sinks. Accordingly, as shown in fig. 2, it is also necessary to provide a back plate opening 21 for wire outgoing at a position of the back plate 2 corresponding to the sinking terminal 12.

Fig. 3 is a schematic plan structure view of a lamp panel in the related art, and fig. 4 is a schematic side view structure view of the lamp panel in the related art.

As shown in fig. 3 and 4, can effective reduce cost when the lamp plate adopts the individual layer circuit, and the lamp plate of individual layer circuit need adopt to sink terminal 12 and connect FFC just can be connected with the control panel, need punch the lamp plate this moment, and this just causes the lamp plate and can't be used for walking the line in the open position, has restricted that the lamp plate realizes more partitions.

In view of this, the embodiment of the present invention provides an improved scheme, which can avoid the arrangement of sinking terminals, thereby increasing the number of partitions of the single-layer circuit lamp panel.

Fig. 5 is a schematic plan structure view of the lamp panel according to the embodiment of the present invention, and fig. 6 is a schematic side view of the lamp panel according to the embodiment of the present invention.

As shown in fig. 5 and 6, the backlight module in the embodiment of the present invention includes a lamp panel, and a Flexible Printed Circuit (FPC) f is bound to a light exit side of the lamp panel 1, where the FPC f is used to connect an adjacent lamp panel, a control board of a display device, or an adapter board of the display device, and is not limited herein.

When concrete implementation, probably not set up driver chip on the lamp plate, be connected the back with lamp plate and control panel, the control panel can drive the lamp plate, and the control panel also can be the drive plate this moment. Or the lamp panel can be provided with a driving chip to form the lamp panel with the lamp driving function, and after the lamp panel is connected with the control panel, the control panel can provide a driving control signal for the driving chip to further drive the lamp panel by the driving chip. If the circuit overlength between lamp plate and the control panel, can also set up the keysets between lamp plate and control panel, the lamp plate is connected to the keysets earlier, is connected the control panel by the keysets again.

In the embodiment of the utility model, the lamp panel replaces a sinking terminal for line transmission by binding the FPC. Compared with a sinking terminal mode, the design of walking is allowed around the position of the binding FPC, and therefore the number of partitions which can be realized by the lamp panel adopting a single-layer circuit can be increased.

In some embodiments, the lamp panel may be directly connected to the control board of the display device by binding the flexible circuit board f, so that the lamp panel may be controlled by the control board to be lighted.

In some embodiments, if the line between the lamp panel and the control board is long, the lamp panel may be connected to the adapter board by binding the Flexible circuit board f, and then the adapter board is connected to the control board by a Flexible Flat Cable (FFC).

In some embodiments, jumbo size display device can include a plurality of lamp plates, splices each other between a plurality of lamp plates, can realize circuit intercommunication through binding flexible circuit board so between two at least adjacent lamp plates, and one of them lamp plate in two lamp plates is connected with the control panel this moment can, and the lamp plate still can adopt to bind flexible circuit board and control panel connection, can avoid punching the lamp plate from this, can also simplify the circuit that is connected to the control panel.

In practical application, the circuit design can be carried out according to actual specific conditions, and the embodiment of the utility model does not limit the specific form of the lamp panel connection mode.

Fig. 7 is a schematic cross-sectional structure diagram of the lamp panel provided in the embodiment of the present invention.

As shown in fig. 7, the lamp panel includes: a light source 11 and a circuit board 13.

The circuit board 13 is located on the back panel 2, and the shape of the circuit board 13 is the same as the overall shape of the lamp panel 1. In a general case, the circuit board 13 has a plate shape, and has a rectangular or square shape as a whole. The length of the circuit board 13 is 200mm-1200mm, and the width is 100mm-600 mm.

The Circuit Board 13 may be a Printed Circuit Board (PCB). In the embodiment of the present invention, the circuit board 13 is a single-layer board, and the circuit board with a single-layer circuit is favorable for controlling the cost.

As shown in fig. 7, the circuit board 13 includes: a substrate 131, a wiring layer 132, and a solder resist layer 133.

The substrate 131 has a load-bearing function, and is the same shape and size as the circuit board, and may be generally rectangular or square. The substrate 131 may be made of BT, FR4, aluminum, glass, or flexible material, and is selected according to the application scenario, and is not limited herein.

The circuit layer 132 is disposed on the substrate and is used for transmitting driving signals. The wiring layer 132 may be formed by patterning after copper is coated on the substrate 131. A single layer circuit board typically has the wiring layer 132 formed on only one side of the substrate 131, and is less costly than a double layer board and a multi-layer board.

The solder resist layer 133 is located on a side of the circuit layer 132 away from the substrate 131, and is used for insulating and protecting the circuit layer 132. The solder mask layer 133 is typically a material that is an insulating material applied to the surface of the trace layer 132.

When the circuit layer 132 is manufactured, pads used for connecting electrical elements in the lamp panel can be formed at the same time, the solder mask layer 133 is etched to form a plurality of windows, the windows can expose the pads in the circuit layer, and the pads can be used for welding elements such as a light source, a driving chip, a capacitor or a resistor.

In the embodiment of the present invention, the pads include at least the first pad s1 and the second pad s 2. Wherein the first bonding pad s1 is used for soldering the light source 11, and the second bonding pad s2 is used for binding the flexible circuit board f.

The light source 11 is located on the circuit board 13, specifically, on the side of the solder resist layer 133 away from the circuit layer 132, and the light source 11 is electrically connected to the first pad s1 through the window of the solder resist layer 133.

In the embodiment of the present invention, the Light source 11 may adopt a Mini LED, which is different from a common Light Emitting Diode (LED), and specifically refers to a micro LED chip. Because the Mini LED has a small size, the dynamic light emission of the backlight module is favorably controlled to be smaller in subareas, and the dynamic contrast of the picture is improved. In the embodiment of the utility model, at least one side of the size of a single Mini LED chip is less than 500 μm.

In practical applications, the lamp panel 1 may include only a Mini LED of one color, or may include Mini LEDs of multiple colors, which is not limited herein.

For the single-layer circuit board, the components such as the driving chip, the capacitor, the resistor and the like and the light source 11 are all located on the light emitting side of the lamp panel. The flexible circuit board f is also arranged on the light-emitting side of the lamp panel and is bound with a second bonding pad s2 on the lamp panel 1.

When concrete implementation, can tie in the marginal position of lamp plate 1 with flexible circuit board f, second pad s2 sets up the edge at lamp plate 1 this moment, can avoid sheltering from the problem of light source.

And along with the increase of light source quantity, the interval between the light source is dwindled, and the width at lamp plate edge is only half of the light source interval, and the space at lamp plate edge probably is not enough to set up second pad s2 this moment, for the near circuit wiring scope of maximize increase flexible circuit board outgoing line position, can be located the spaced position between the light source of lamp plate with second pad s2 to make flexible circuit board f bind inside lamp plate 1.

Fig. 8 is a second schematic plane structure diagram of the lamp panel according to the embodiment of the present invention, and fig. 9 is a first schematic plane structure diagram of the flexible circuit board according to the embodiment of the present invention.

As shown in fig. 8, the second pads s2 are disposed at intervals between the light sources 11 of the lamp panel, and the second pads s2 may be made of a conductive material such as copper or tin. As shown in fig. 9, the two ends of the flexible circuit board f are provided with the gold fingers x, and after the gold fingers x at one end of the flexible circuit board are bound with the second pads s2, the flexible circuit board f and the lamp panel 1 can be electrically connected. The bonding connection between the gold finger x and the second pad s2 of the flexible circuit board may be implemented by using an anisotropic conductive adhesive. In addition, other binding modes with the same function may also be adopted, which is not limited herein.

As shown in fig. 5, after the flexible circuit board f is bound, the area where the flexible circuit board f is located covers part of the light source 11 in the orthographic projection of the lamp panel. In order to avoid the flexible circuit board blocking the light source 11 from emitting light, as shown in fig. 9, an opening k1 is disposed at a position of the flexible circuit board f corresponding to the light source, and the opening k1 can expose the light source, so that the light source emits light smoothly.

At least a partial region between the flexible circuit board f and the lamp panel 1 is provided with an adhesive layer (not shown in the figure) for adhering the flexible circuit board and the lamp panel. When the lamp panel is specifically implemented, except for the binding position, the local or whole gum of the FPC and the lamp panel contact area is attached to the surface of the lamp panel, so that the phenomenon that the FPC is uneven or tilted to shield a light source is avoided.

In the embodiment of the present invention, the opening k1 of the flexible circuit board f may be provided in various forms. In some embodiments, as shown in fig. 5 and 9, the openings k1 of the flexible circuit board f correspond to the light sources 11 one by one, and one light source 11 is disposed in one opening k 1. The openings k1 of the flexible circuit board f correspond to the light sources 11 one by one, and the flexible circuit board can be utilized to the maximum extent for wiring. In general, the opening k1 of the flexible circuit board may be slightly larger than the size of the light source 11, and when the light source 11 is packaged and protected by a Mini LED package structure, the size of the packaged Mini LED needs to be slightly larger than the size of the packaged Mini LED package structure, so as to avoid the flexible circuit board f from blocking the light source 11.

In specific implementation, as shown in fig. 5 and 8, the light sources 11 on the lamp panel 1 may be generally arranged in an array along a first direction and a second direction, and the first direction and the second direction are crossed. The first direction may be a row direction of the light source array, and the second direction may be a column direction of the light source array. In some embodiments, one opening k1 of the flexible circuit board f may also correspond to at least two light sources, and at least two light sources 11 are disposed within one opening k 1.

Fig. 10 is a second schematic plane structure diagram of the flexible circuit board according to the embodiment of the present invention, and fig. 11 is a third schematic plane structure diagram of the flexible circuit board according to the embodiment of the present invention.

As shown in fig. 10, the opening k1 of the flexible circuit board is a bar-shaped opening extending in the first direction (horizontal direction in fig. 10), and a plurality of light sources arranged in a line are provided in one bar-shaped opening; alternatively, as shown in fig. 11, the opening k1 of the flexible circuit board is a bar-shaped opening extending in the second direction (vertical direction in fig. 11), and a plurality of light sources arranged in a line are provided in one bar-shaped opening. The flexible circuit board adopts the shape of the opening k1, so that the number of the openings can be reduced, and the manufacturing process is simplified.

Fig. 12 is a fourth schematic plan view of a flexible circuit board according to an embodiment of the present invention.

In some embodiments, as shown in fig. 12, the flexible circuit board f may include only one opening k1, and all light sources corresponding to the region where the flexible circuit board is located are disposed in the opening k 1. The flexible circuit board is only provided with one opening, so that the manufacturing difficulty of the flexible circuit board can be simplified to the maximum extent, and meanwhile, the flexible circuit board can be prevented from shielding the light source to the maximum extent.

In practical implementation, the shape of the opening k1 for exposing the light source in the flexible circuit board f may be designed according to practical situations, the structures shown in fig. 9 to 12 provided in the embodiments of the present invention are only used for illustration, and in practical application, the shape of the opening k1 may be designed according to the circuit design and the arrangement rule of the light sources, which is not limited herein.

In the backlight module, a reflecting layer or a reflecting sheet is usually arranged on the surface of the circuit board, so that light emitted from a light source to one side of the lamp panel and light reflected by other elements can be reflected to one side of the light outlet, and the utilization rate of the light source is improved.

Fig. 13 is a third schematic plan view of the lamp panel according to the embodiment of the present invention.

In some embodiments, as shown in fig. 13, the solder resist layer on the surface of the circuit board may be made of a reflective material, so that the light-emitting surface of the lamp panel has a reflective property, while the surface material of the flexible circuit board cannot reflect light, so that in an embodiment of the present invention, a reflective layer or a reflective sheet (w1) is disposed on the surface of the flexible circuit board f facing away from the lamp panel 1. The reflective material on the surface of the circuit board is usually white ink, which is referred to as white oil for short, and then the surface of the flexible circuit board f can be coated with a layer of white oil with the same or similar reflectivity to form the reflective layer, so that the reflective effect of each position of the lamp panel is consistent. Or, a reflector plate with the same or similar reflectivity to the white oil can be arranged on the surface of the flexible circuit board f, and the reflector plate is perforated to expose the light source 11, so that the light reflecting effect of each position of the lamp panel is consistent.

It should be noted that if the opening of the reflective sheet on the surface of the flexible circuit board f is larger than the opening k1 of the flexible circuit board f, the edge of the opening of the flexible circuit board may be exposed, and in order to make the reflective effect uniform, the surface of the flexible circuit board exposed by the opening of the reflective sheet may be coated with white oil, or the entire surface of the flexible circuit board may be coated with white oil, so that the reflective effect is uniform at each position.

In some embodiments, as shown in fig. 14, the backlight module further includes: the reflector plate 5 is positioned on the light emergent surface of the lamp panel, and the reflector plate 5 covers the lamp panel 1 and the flexible circuit board f on the lamp panel; the reflective sheet 5 includes a plurality of openings k2 for exposing the light source. Because the thickness of flexible circuit board f is very little, consequently can set up the reflector plate on the surface of lamp plate 1 and flexible circuit board f, carry out the trompil in order to expose the light source to the reflector plate, be favorable to improving the utilization ratio of light source.

Similarly, if the size of the opening k2 of the reflective sheet is larger than the size of the opening k1 of the flexible circuit board f, the edge of the opening of the flexible circuit board is exposed, and in order to make the reflective effect uniform, the surface of the flexible circuit board exposed by the opening k2 of the reflective sheet or the entire surface of the flexible circuit board may be coated with white oil having the same or similar reflectivity as that of the reflective sheet to form the reflective layer w2, so that the reflective effect is uniform at each position.

In specific implementation, the main component of the white oil is titanium dioxide, which is used for improving the reflectivity, and the reflectivity of the white oil coated on the surface of the flexible circuit board is as close as possible to that of the white oil on the surface of the lamp panel, and the reflectivity of the white oil is usually greater than or equal to 85%.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the utility model.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A display device, comprising:

a display panel for image display;

the backlight module is positioned at the light incidence side of the display panel and used for providing backlight;

the backlight module comprises a lamp panel, a flexible circuit board is bound to the light emitting side of the lamp panel, and the flexible circuit board is used for connecting adjacent lamp panels, control panels of display devices or adapter plates of the display devices.

2. The display device of claim 1, wherein the lamp panel comprises:

a substrate;

the circuit layer is positioned on one side of the substrate;

the solder mask layer is positioned on one side of the circuit layer, which is far away from the substrate;

the light source is positioned on one side, away from the circuit layer, of the solder mask layer;

the solder mask layer comprises a plurality of windows, and the windows are used for exposing the first bonding pads and the second bonding pads; the first welding pad is used for welding the light source, and the second welding pad is used for binding the flexible circuit board.

3. The display device of claim 2, wherein the second pads are located at spaced locations between the light sources of the lamp panel;

the area where the flexible circuit board is located covers part of the light source in the orthographic projection of the lamp panel; an opening is formed in the position, corresponding to the light source, of the flexible circuit board, and the opening is used for exposing the light source; at least partial region between the flexible circuit board and the lamp panel is provided with a bonding layer for bonding the flexible circuit board and the lamp panel.

4. The display device according to claim 3, wherein the openings of the flexible circuit board correspond one-to-one to the light sources, and one of the light sources is disposed in one of the openings.

5. The display device of claim 3, wherein at least two of the light sources are disposed within one of the openings of the flexible circuit board.

6. The display device according to claim 5, wherein the light sources are arranged in an array along a first direction and a second direction, the first direction and the second direction intersecting;

the opening of the flexible circuit board is a strip-shaped opening extending along the first direction, and a plurality of light sources arranged in a line are arranged in one strip-shaped opening;

or, the opening of the flexible circuit board is a strip-shaped opening extending along the second direction, and a plurality of light sources arranged in a line are arranged in one strip-shaped opening.

7. The display device as claimed in claim 5, wherein the flexible circuit board includes only one opening, and all the light sources corresponding to an area where the flexible circuit board is located are disposed in the opening.

8. The display device according to any one of claims 3 to 7, wherein the backlight module further comprises:

the reflector plate is positioned on the light emergent surface of the lamp panel and covers the flexible circuit board; the reflective sheet includes a plurality of openings for exposing the light sources;

a reflective layer is arranged on the surface of the flexible circuit board exposed by the opening; or, the whole surface of one side of the flexible circuit board facing the reflector plate is provided with a light reflecting layer.

9. The display device according to any one of claims 3 to 7, wherein the solder resist layer employs a light reflecting material;

and a reflective layer or a reflective sheet is arranged on the surface of one side of the flexible circuit board, which deviates from the solder mask layer.

10. The display apparatus of claim 2, wherein the light source is a Mini LED.