Backlight module and display equipment

Abstract

The utility model relates to the technical field of display, in particular to a backlight module and display equipment. Comprising a back plate, a diffusion plate and a PCB substrate, the back plate is connected with the PCB substrate through a fastening piece, a plurality of supporting pieces capable of guiding light are arranged between the PCB substrate and the diffusion plate, grooves matched with LED lamp beads are formed in the bottoms of the supporting pieces, the supporting pieces are arranged over the LED lamp beads in a sleeving mode, the LED lamp beads are just located in the center positions of the groove spaces in the bottoms of the supporting pieces, and the LED lamp beads are arranged in the grooves. The top of the supporting piece makes contact with the back face of the diffusion plate. When backlight LED lamp beads are lightened, the LED lamp beads located in the grooves of the supporting piece are synchronously lightened, the supporting piece capable of guiding light guides the light emitted by the LED lamp beads on the PCB substrate to the contact point of the top of the supporting piece and the diffusion plate through the total reflection effect of the light, so that the shadow of the contact point disappears, and after the light is guided and attenuated by the supporting piece, the light emitted by the LED lamp beads on the PCB substrate is emitted to the diffusion plate. The contact point of the top of the supporting piece and the diffusion plate has no obvious shadow, and the shadow formed by the contact point of the supporting piece and the diffusion plate can be effectively weakened.

Description

Technical Field

[0001] The utility model relates to the field of display technology, in particular to a backlight module and a display device. Background Art

[0002] Liquid crystal display screens play an important role in the entire display industry. The backlight module is an important component of the liquid crystal display screen. The uniformity, brightness, color temperature, color gamut and other parameters of the backlight will directly affect the display effect of the liquid crystal display screen. Under the same conditions, a good backlight module design will make the visual effect of the display screen better. The support column is a very important component in the backlight module, mainly used for the direct backlight of large-size display screens. Since the diffuser plate in the backlight module has a certain degree of flexibility, a large-size diffuser plate requires multiple support columns to support its bottom so that the middle of the diffuser plate does not collapse and remains on a horizontal plane. The common method in the industry is to set multiple support column fixing positions at appropriate positions that do not interfere with the arrangement of the backlight LED lamp beads. In the cavity of the direct backlight, no matter what material or color the support column is, since there is no light coming out of the support column itself, the light in the backlight cavity will form a shadow at the contact point between the support column and the diffuser plate after reflection and refraction by the support column. The smaller the distance between the backlight LED and the diffuser, the more severe the shadow at the contact point between the support column and the diffuser under the same conditions, which will seriously affect the display effect of the display. Therefore, we designed a new optical application solution to help eliminate the shadow of the support column. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a backlight module and a display device to solve the problem in the prior art that the smaller the distance between the backlight LED lamp beads and the diffusion plate, the more serious the shadow at the contact point between the support column and the diffusion plate, which seriously affects the display effect of the display screen.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] The utility model proposes a backlight module, comprising a back plate, a diffusion plate and a PCB substrate, wherein the diffusion plate is located above the PCB substrate, the back plate is connected to the PCB substrate via fasteners, a plurality of light-guiding support members are arranged between the PCB substrate and the diffusion plate, and the support members are arranged on the PCB substrate for supporting the diffusion plate; wherein a plurality of LED lamp beads are arranged in an array on the PCB substrate, a groove adapted to the LED lamp beads is provided at the bottom of the support member, the LED lamp bead is placed in the groove, and the top of the support member contacts the back side of the diffusion plate.

[0006] Wherein, the backlight module also includes a reflective sheet, and the reflective sheet is located between the diffusion plate and the PCB substrate; the reflective sheet is provided with a positioning hole for the LED lamp bead to pass through, and the LED lamp bead extends out of the positioning hole.

[0007] A bending reflection structure is provided on the peripheral side of the reflection sheet, the bending reflection structure contacts the edge of the diffusion plate, the bending reflection structure cooperates with the reflection sheet to form a bowl-shaped structure, and the reflection sheet supports the diffusion plate through the support member.

[0008] Wherein, positioning plates are extended outwardly from both ends of the support member, and the positioning plates are provided with a first through hole.

[0009] Among them, a third through hole is provided on the PCB substrate of the LED lamp bead located in the groove corresponding to the position of the first through hole, a second through hole is provided on the reflector corresponding to the position of the first through hole, and a fourth through hole is provided on the back plate corresponding to the position of the third through hole. The fourth through hole has an internal thread, and is fastened by a bolt that passes through the first through hole, the second through hole, and the third through hole in sequence and then cooperates with the internal thread of the fourth through hole.

[0010] Wherein, the support member is extended upward to form a support portion, and the support portion is used to support the diffusion plate.

[0011] Wherein, the supporting portion is triangular.

[0012] Wherein, the material of the support member is PC material, and the support member is made by using a mixed diffusing agent of PC material.

[0013] The utility model also proposes a display device, which includes an LED backlight module as described in any one of the above items; it also includes a display panel, a detachably connected front frame and a bottom frame, and the front frame and the bottom frame enclose a space for accommodating the display panel and the backlight module.

[0014] The display panel is connected to the backlight module, the display panel is arranged in the front frame, and the backlight module is arranged in the bottom frame.

[0015] In the backlight module provided by the utility model, since a plurality of light-guiding support members are provided between the PCB substrate and the diffusion plate, the support members are arranged on the PCB substrate for supporting the diffusion plate; a plurality of LED lamp beads are arranged in an array on the PCB substrate, a groove adapted to the LED lamp beads is provided at the bottom of the support member, the support member is sleeved just above the LED lamp beads, so that the LED lamp beads are located at the center of the groove space at the bottom of the support member, the support member is fixed to the PCB substrate by a fastener, and the top of the support member is aligned with the diffusion plate. The back of the board is in contact with the support member; when the backlight LED beads are lit, the LED beads in the groove of the support member are lit synchronously, and the light-guiding support member guides the light emitted by the LED beads on the PCB substrate to the contact point between the top of the support member and the diffuser plate through the total reflection effect of light, so that the shadow at the contact point disappears, and after the light guide attenuation of the support member, there is no obvious shadow at the contact point between the top of the support member and the diffuser plate, which can effectively reduce the shadow formed at the contact point between the support member and the diffuser plate; thereby, the uniformity and consistency of the light output can be significantly improved, which is beneficial to improving the display performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the backlight module provided in the first embodiment of the utility model.

[0017] Figure 2 It is a partial cross-sectional view of the overall structure of the backlight module provided in the first embodiment of the utility model.

[0018] Figure 3 It is a structural schematic diagram of a supporting member of a backlight module provided in the first embodiment of the utility model.

[0019] Figure 4 yes Figure 3 Another perspective of the picture.

[0020] Figure 5 It is a schematic diagram of the structure of the reflective sheet of the backlight module provided in the first embodiment of the utility model.

[0021] Figure 6 It is a schematic diagram of the overall structure of the display device provided in the second embodiment of the present utility model. DETAILED DESCRIPTION

[0022] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0023] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0024] Although the terms first, second, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the elements, components, regions, layers or sections discussed below can be referred to as second elements, components, regions, layers or sections without departing from the teachings of the example embodiments.

[0025] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front end", "rear side", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, the element described as "below other elements or features" or "below other elements or features" will then be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0026] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for illustration.

[0027] See also Figures 1 to 5The backlight module 100 provided in the first embodiment of the utility model comprises a back plate 10, a diffuser plate 20 and a PCB substrate 30, wherein the PCB substrate 30 is fixed to the back plate 10 by fasteners, the diffuser plate 20 is located above the PCB substrate 30, and a plurality of LED lamp beads 31 are arranged in an array on the PCB substrate 30, and a plurality of light-guiding support members 40 for supporting the diffuser plate 20 are provided between the PCB substrate 30 and the diffuser plate 20, wherein the support members 40 can effectively support the diffuser plate 20, prevent the diffuser plate 20 from being partially sunken, and ensure the display effect; the support members 40 are connected to the PCB substrate 30 but not to the back plate 10, effectively preventing the damage of the LED lamp beads 31, ensuring normal display and prolonging the service life; wherein the bottom of the support member 40 is provided with a groove 41 adapted to the LED lamp beads 31, and the support member 40 is sleeved just above the LED lamp beads 31, so that the LED lamp beads 31 can be displayed on the back plate 10. The LED lamp bead 31 is just located at the center position of the groove 41 space at the bottom of the support member 40. The support member 40 is fixed to the PCB substrate 30 by fasteners. The top of the support member 40 contacts the back of the diffuser 20. The material of the support member 40 is PC material. The support member 40 is made of PC material plus a certain proportion of mixed diffusing agent, so that the transparency of the support member 40 is reduced to an appropriate percentage; when the backlight LED lamp bead is lit, the LED lamp bead 31 located in the groove 41 of the support member is lit synchronously, and the light-guiding support member guides the light emitted by the LED lamp bead 31 on the PCB substrate 30 to the contact point between the top of the support member and the diffuser 20 through the total reflection effect of light, so that the shadow of the contact point disappears. After the light guide attenuation of the support member 40, there is no obvious shadow at the contact point between the top of the support member 40 and the diffuser 20, and the shadow formed at the contact point between the support member 40 and the diffuser 20 can be effectively weakened.

[0028] In the first embodiment of the utility model, the backlight module 100 also includes a reflective sheet 50, which is located between the diffuser plate 20 and the PCB substrate 30; the reflective sheet 50 is provided with a positioning hole 51 for the LED lamp bead 31 to pass through, and the LED lamp bead 31 extends out of the positioning hole 51, and the reflective sheet 50 supports the diffuser plate 20 through the support member 40; a bending reflective structure 52 is provided on the circumference of the reflective sheet 50, and the bending reflective structure 52 is used to converge light to achieve the purpose of light enhancement; the bending reflective structure 52 is in contact with the diffuser plate 20, so that the reflective sheet 50 is a bowl-shaped space, and the diffuser plate 20 and the reflective sheet 50 are used to diffuse the light emitted by the LED lamp bead 31.

[0029] In the first embodiment of the utility model, positioning plates 43 are provided at both ends of the support member 40 extending outward, the support member 40 and the positioning plate 43 are an integrally formed structure, and the positioning plate is provided with a first through hole 44; a third through hole 32 is provided on the PCB substrate 30 of the LED lamp bead 31 located in the groove 41 at a position corresponding to the first through hole 44, a second through hole 53 is provided on the reflector 50 at a position corresponding to the first through hole 44, and a fourth through hole 11 is provided on the back plate 10 at a position corresponding to the third through hole 32, and the fourth through hole 11 has an internal thread, which is locked and fixed by a bolt that passes through the first through hole 44, the second through hole 53, and the third through hole 32 in sequence and then cooperates with the internal thread of the fourth through hole 11.

[0030] In the first embodiment of the utility model, the support member 40 is extended upward to be provided with a support portion 42; the support portion 42 is triangular in shape to increase its strength; the upper end of the support portion 42 abuts against the lower surface of the diffuser plate 20, thereby supporting the diffuser plate 20 above the PCB substrate 30 to prevent the diffuser plate 20 from collapsing and bending, and ensuring that there is a uniform spacing between the diffuser plate 20 and the PCB substrate 30, so that the light emitted by the LED lamp beads 31 can be evenly displayed on the diffuser plate 20.

[0031] See also Figure 6 , Embodiment 2 of the present invention further provides a display device, the display device includes the LED backlight module 100 as described in any one of the above items; and also includes a display panel 210, a detachably connected front frame 220 and a bottom frame 230, the front frame 220 and the bottom frame 230 enclose a space for accommodating the display panel 210 and the backlight module 100, the display panel 210 is connected to the backlight module 100, the display panel 210 is arranged inside the front frame 220, and the backlight module 100 is arranged inside the bottom frame 230.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A backlight module, characterized in that: It includes a back plate, a diffusion plate and a PCB substrate, wherein the diffusion plate is located above the PCB substrate, the back plate is connected to the PCB substrate via fasteners, a plurality of light-guiding support members are provided between the PCB substrate and the diffusion plate, and the support members are provided on the PCB substrate for supporting the diffusion plate; wherein a plurality of LED lamp beads are arranged in an array on the PCB substrate, a groove adapted to the LED lamp beads is provided at the bottom of the support member, the LED lamp bead is placed in the groove, and the top of the support member contacts the back side of the diffusion plate.

2. The backlight module according to claim 1, wherein: It also includes a reflective sheet, which is located between the diffuser plate and the PCB substrate; the reflective sheet is provided with a positioning hole for the LED lamp bead to pass through, and the LED lamp bead extends out of the positioning hole.

3. The backlight module according to claim 2, wherein: A bending reflection structure is provided on the peripheral side of the reflection sheet, the bending reflection structure contacts the edge of the diffusion plate, the bending reflection structure cooperates with the reflection sheet to form a bowl-shaped structure, and the reflection sheet supports the diffusion plate through the support member.

4. The backlight module according to claim 3, wherein: Positioning plates are extended outwardly from both ends of the support member, and the positioning plates are provided with a first through hole.

5. The backlight module according to claim 4, wherein: A third through hole is provided on the PCB substrate of the LED lamp bead located in the groove at a position corresponding to the first through hole, a second through hole is provided on the reflector at a position corresponding to the first through hole, and a fourth through hole is provided on the back plate at a position corresponding to the third through hole. The fourth through hole has an internal thread, and is fastened by a bolt that passes through the first through hole, the second through hole, and the third through hole in sequence and then cooperates with the internal thread of the fourth through hole.

6. The backlight module according to claim 1, wherein: The support member is extended upward to form a support portion, and the support portion is used to support the diffusion plate.

7. The backlight module according to claim 6, wherein: The supporting portion is triangular in shape.

8. The backlight module according to claim 1, wherein: The support member is made of PC material, and is made of a mixed diffusing agent of PC material.

9. A display device, comprising a backlight module according to any one of claims 1 to 8, characterized in that: It also includes a display panel, a detachably connected front frame and a bottom frame, wherein the front frame and the bottom frame are combined to form a space for accommodating the display panel and the backlight module.

10. The display device according to claim 9, characterized in that: The display panel is connected to the backlight module. The display panel is arranged in the front frame, and the backlight module is arranged in the bottom frame.

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