WO2024164400A1

WO2024164400A1 - Backlight module with light-transmitting supports, and display device

Info

Publication number: WO2024164400A1
Application number: PCT/CN2023/082286
Authority: WO
Inventors: 林家叶; 张政德; 侯珮棻
Original assignee: 瑞仪(广州)光电子器件有限公司
Priority date: 2023-02-10
Filing date: 2023-03-17
Publication date: 2024-08-15
Also published as: CN221225241U

Abstract

A backlight module with light-transmitting supports (3), and a display device containing the backlight module. The backlight module contains: an optical unit (1), which is provided with a light-emitting mechanism (11) and at least one optical film (12); a frame structure (2), which is provided with a back frame (21), wherein the back frame (21) is provided with a bottom plate (211) and a plurality of side plates (212) which extend from the bottom plate (211) towards the at least one optical film (12), the bottom plate (211) being used for bearing the light-emitting mechanism (11), and the side plates (212) being provided with engagement slots (213); and a plurality of light-transmitting supports (3), which are used for bearing the at least one optical film (12) together, the light-transmitting supports (3) being provided with first limiting parts (31) that are detachably fitted into the engagement slots (213) so that the light-transmitting supports (3) are fixed to the side plates (212).

Description

Backlight module and display device with light-transmitting support member

This application claims the priority of Chinese patent application No. 202310110792.7 filed on February 10, 2023, and entitled “Backlight module and display device with light-transmitting support member”, all contents of which are hereby incorporated by reference into this application.

Technical Field

The invention relates to a backlight module, in particular to a backlight module with a light-transmitting support member for improving the problem of dark bands at the edge of a light-emitting surface, and a display device using the backlight module.

Background Art

The backlight module can be applied to general displays, car displays, and wearable devices such as virtual reality (VR) and augmented reality (AR). Furthermore, according to the setting position of the light-emitting unit, the backlight module can be divided into an edge-entry backlight module and a direct-type backlight module. Among them, the direct-type backlight module includes: a frame structure, an optical film and a light board (light board), and the optical film and the light board are arranged in the accommodation space of the frame structure. The frame structure also includes an inner frame, which is adjacent to the edge area of the light board and is used to carry the optical film. Since the light luminance of the edge area of the light board is lower than the light luminance of the central area of the light board, the backlight module has the problem of uneven light output.

Please refer to FIG. 1 , which shows a conventional direct-type backlight module. The conventional direct-type backlight module includes a back frame 92, a plastic frame 93 and an outer frame 94 for carrying a light-emitting mechanism 91. The plastic frame 93 surrounds the light-emitting mechanism 91 and is glued to the inner side of the back frame 92. The outer frame 94 surrounds the light-emitting mechanism 91 and is glued to the outer side of the back frame 92. The light-emitting mechanism 91 also includes a plurality of light sources 95, a plurality of reflective cups 96 and a plurality of optical films 97. A light source 95 is disposed in each reflective cup 96, and a plurality of optical films 97 are disposed above the plurality of light sources 95.

Since the plastic frame 93 has the requirements of mechanical support and optical reflection, the side of the plastic frame 93 needs to be designed to have a similar slope to the side of the reflector cup 96, so as to support multiple optical films 97 and direct the light source emitted by the light-emitting mechanism 91 toward the light-emitting surface of the conventional direct-type backlight module. Directional reflection.

However, since the plastic frame 93 itself has a certain thickness limit, and an assembly tolerance needs to be reserved between the bottom of the light-emitting mechanism 91 and the bottom of the plastic frame 93, the reflective cup 96 closer to the edge area of the light-emitting mechanism 91 cannot be further close to the plastic frame 93, so that the light source 95 located in the edge area of the light-emitting mechanism 91 can not reach the bottom of the outer frame 94 (i.e., the circular frame in Figure 1). Therefore, the conventional direct-type backlight module has the problem of dark edge bands.

In view of this, it is necessary to provide a backlight module to solve the above problems.

Summary of the invention

The object of the present invention is to provide a backlight module with a light-transmitting support member, so as to improve the problem of dark bands at the edges of the light-emitting surface.

Another object of the present invention is to provide a display device having the backlight module with the light-transmitting support member.

To achieve the above-mentioned purpose, the present invention provides a backlight module with a light-transmitting support member, comprising: an optical unit, which has a light-emitting mechanism and at least one optical film; a frame structure, which has a back frame, the back frame has a bottom plate and a plurality of side plates extending from the bottom plate toward the at least one optical film, the bottom plate is used to carry the light-emitting mechanism, and the side plates have a snap-fitting slot hole; and a plurality of light-transmitting support members, which are used to jointly carry at least one optical film, the light-transmitting support members have a first limiting portion that can be detachably combined with the snap-fitting slot hole to fix the light-transmitting support members to the side plates.

In some embodiments, the engaging slot has a fixing section and a guiding section, the aperture of the guiding section is larger than the aperture of the fixing section, and the first limiting portion slides from the guiding section toward the fixing section to be tightly coupled to the fixing section.

In some embodiments, the back frame also has a plurality of latching members extending from the bottom plate, and the light-transmitting support member also has a second limiting portion corresponding to the latching members. The plurality of latching members are respectively aligned and combined with the second limiting portions of the plurality of light-transmitting support members to fix the plurality of light-transmitting support members on the bottom plate.

In some embodiments, the latch is a bent portion extending toward the side plate formed by convexing the bottom plate, and the second limiting portion is a groove extending along the coupling direction, and the groove is detachably coupled to the bent portion in the coupling direction.

In some embodiments, the engaging slot has a fixing section and a guiding section, and the light-transmitting support has a The first surface of the side plate and the second surface located on the opposite side of the first surface, the second surface faces the light-emitting mechanism, the first surface forms a first limiting portion, and the second surface forms a second limiting portion. The first limiting portion is embedded in the guide section of the engaging slot and moves along the engaging direction so that the first limiting portion is tightly coupled to the fixed section, and the second limiting portion and the latch are engaged at the same time.

In some embodiments, the light-transmitting support member includes a supporting portion for carrying at least one optical film and a connecting portion connected to the supporting portion, the connecting portion having a first surface facing the side panel and a second surface facing the light-emitting mechanism, the connecting portion protruding toward the side panel to form a first limiting portion, the connecting portion and the supporting portion cooperate with each other to form an accommodating space, the accommodating space accommodates the edge portion of the reflective cup of the light-emitting mechanism, and the edge portion of the reflective cup is located below the supporting portion.

In some embodiments, the coupling portion has a front end portion connected to the supporting portion and a rear end portion connected to the front end portion, and the thickness of the rear end portion gradually decreases from the bottom surface thereof toward the front end portion.

The present invention further provides a display device, comprising: the aforementioned backlight module; an outer frame, which is combined with the back frame, the outer frame comprising a side wall segment surrounding the optical unit and a supporting segment extending from the side wall segment toward the optical unit; and a display panel, which is arranged on the supporting segment, wherein the supporting segment and the multiple light-transmitting support members jointly clamp the at least one optical film.

The backlight module and display device with a light-transmitting support member of the present invention have the following characteristics: not only can it ensure that the light emitted from the edge area of the optical unit can pass through the light-transmitting support member and then emit light, but also improve the effect of the light luminance of the edge area of the backlight module, so as to avoid the generation of dark bands at the edge of the light-emitting surface of the backlight module. Furthermore, the present invention can also directly embed the light-transmitting support member with its first limiting portion in the engaging slot hole set on the side panel, and the assembly and positioning of the light-transmitting support member can be completed without the use of additional tape; furthermore, the overall size of the multiple light-transmitting supports is relatively small compared to the size of the glue frame of the conventional direct-down backlight module. Therefore, the backlight module and display device with a light-transmitting support member of the present invention have the effects of improving the light luminance of the edge area of the backlight module, light weight, reducing the glue pasting cost and reducing the overall working hours.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more fully understand the embodiments of the present invention and its advantages, the following description is now made with reference to the accompanying drawings, in which:

FIG1 is a partial cross-sectional view of a conventional direct-type backlight module;

FIG2 is a partial cross-sectional view of a backlight module of the present invention;

FIG3 is an enlarged view of the engaging slots of the backlight module of the present invention located on the side plate;

FIG4 is a perspective view of a light-transmitting support member of a backlight module of the present invention;

5a and 5b are diagrams showing the operation of the first limiting portion and the engaging slot of the backlight module of the present invention being combined with each other;

6a and 6b are diagrams showing the action of the second limiting portion and the latching member of the backlight module of the present invention being combined with each other;

FIG. 7 is a partial cross-sectional view of a display device according to the present invention.

DETAILED DESCRIPTION

The embodiments of the present invention are described in detail as follows with reference to the accompanying drawings. The accompanying drawings are mainly simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner. Therefore, only elements related to the present invention are marked in the accompanying drawings, and the displayed elements are not drawn in terms of the number, shape, size ratio, etc. during implementation. The specifications and dimensions during actual implementation are actually a selective design, and the element layout may be more complicated.

The following description of each embodiment refers to the accompanying drawings to illustrate specific embodiments in which the present invention can be implemented. Directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", etc., only refer to the directions of the accompanying drawings. Therefore, the directional terms used are used to illustrate and understand the present application, rather than to limit the present application. In addition, in the specification, unless explicitly described to the contrary, the word "comprising" will be understood to mean including the elements described, but not excluding any other elements.

Please refer to FIG. 2 , which is a partial cross-sectional view of a backlight module with a light-transmitting support member of the present invention. The backlight module comprises: an optical unit 1, a frame structure 2 and a plurality of light-transmitting support members 3. The frame structure 2 is used to carry the optical unit 1. The plurality of light-transmitting support members 3 are detachably combined with the frame structure 2, which can not only support the optical unit 1, but also enable the optical unit 1 to be arranged on the frame structure 2 in a manner that it faces the outside of the backlight module, thereby ensuring that the light emitted from the edge area of the optical unit 1 is emitted after passing through the light-transmitting support members 3, thereby improving the brightness of the light emitted from the edge area of the backlight module, and avoiding the generation of dark bands in the edge area of the light-emitting surface of the backlight module.

The optical unit 1 comprises a light emitting mechanism 11 and at least one optical film 12, wherein the light emitting mechanism 11 is located below the at least one optical film 12 and comprises at least one reflective cup 111. A light emitting element 112 is disposed therein, and the light emitting element 112 is used to emit light toward at least one optical film 12. In this embodiment, the light emitting element 112 is a light emitting diode. The optical film 12 may include at least one of a diffusion plate, a prism sheet, and a diffusion film, but is not limited thereto.

Please refer to FIG. 3 , the frame structure 2 has a back frame 21, which includes a bottom plate 211 and a plurality of side plates 212 extending from the bottom plate 211 toward at least one optical film 12. In this embodiment, the number of the plurality of side plates 212 is four, and together with the bottom plate 211, they surround and cover the optical unit 1. The bottom plate 211 is used to carry the light-emitting mechanism 11, and the side plates 212 have a plurality of engaging slots 213. The engaging slots 213 have a fixed section 213a and a guide section 213b, and the aperture of the guide section 213b is larger than the aperture of the fixed section 213a.

The back frame 21 also has a plurality of latches 214 extending from the bottom plate 211 , and the plurality of latches 214 are used to limit and fix the plurality of light-transmitting supports 3 in the first direction Z. Specifically, the latches 214 are bent portions extending toward the side plates 212 formed by convexing the bottom plate 211 , and the bent portions are the latches 214 .

Please refer to FIG. 2, FIG. 4, FIG. 5a, FIG. 5b, FIG. 6a and FIG. 6b, a plurality of light-transmitting support members 3 are used to carry at least one optical film 12 together, and the light-transmitting support member 3 includes a first limiting portion 31 detachably coupled to the engaging slot 213, and the first limiting portion 31 slides from the guide section 213b toward the coupling direction D of the fixing section 213a to be tightly coupled to the fixing section 213a, so that the light-transmitting support member 3 is fixed on the side plate 212. In this embodiment, the light-transmitting support member 3 is made of a transparent plastic material to have a better reflection effect; the coupling direction D can be the second direction Y or the third direction X according to the position of the engaging slot 213 on the side plate 212. Therefore, the first limiting portion 31 has the effect of limiting and fixing the light-transmitting support member 3 in the first direction Z and the coupling direction D at the same time to improve the coupling stability.

Please refer to Figures 2, 4, 5a, 5b, 6a and 6b, the light-transmitting support member 3 also has a second limiting portion 32 corresponding to the latch member 214. The second limiting portions 32 of the plurality of light-transmitting supports are respectively aligned and combined with the plurality of latch members 214 to fix the plurality of light-transmitting supports 3 on the bottom plate 211. In this embodiment, the second limiting portion 32 is a groove extending along the combining direction D, and the groove is detachably combined with the bending portion in the combining direction D. Thus, the second limiting portion 32 has the function of limiting and fixing the light-transmitting support member 3 in the first direction Z, and supporting the light-transmitting support member 3 along the third direction X, thereby having the effect of improving the stability of the combination.

2, 4, 5a, 5b, 6a and 6b, the light-transmitting support member 3 has a The first surface 33 of the side plate 212 and the second surface 34 located on the opposite side of the first surface 33 , the second surface 34 faces the light emitting mechanism 11 , wherein the first surface 33 forms a first limiting portion 31 and the second surface 34 forms a second limiting portion 32 .

According to the backlight module of the present invention, when assembling the light-transmitting support member 3, the first position-limiting portion 31 of the light-transmitting support member 3 is engaged with the guide section 213b of the engaging slot 213, and is moved along the engaging direction D, so that the first position-limiting portion 31 is tightly engaged with the fixing section 213, and the second position-limiting portion 32 is engaged with the engaging member 214 at the same time. Thus, the light-transmitting support member 3 is fixed to the bottom plate 211 and the side plate 212 at the same time, and the backlight module of the present invention can complete the assembly and positioning of the light-transmitting support member 3 without using additional adhesive tape, which has the effects of reducing the adhesive laminating cost and shortening the overall working hours.

2 and 4, the light-transmitting support member 3 includes a support portion 3a for carrying at least one optical film 12 and a connecting portion 3b connected to the support portion 3a. The connecting portion 3b has a first surface 33 facing the side plate 212 and a second surface 34 facing the light-emitting mechanism 11. In this embodiment, the connecting portion 3b protrudes toward the side plate 212 to form a first limit portion 31, and the connecting portion 3b is recessed toward the light-emitting mechanism 11 to form a second limit portion 32.

On the other hand, the combination portion 3b cooperates with the support portion 3a to form an accommodation space 35. Specifically, the combination portion 3b has a front end portion 3c connected to the support portion 3a and a rear end portion 3d connected to the front end portion 3c, and the thickness of the rear end portion 3d gradually decreases from its bottom surface toward the front end portion 3c to form the accommodation space 35. In this embodiment, the accommodation space 35 accommodates the edge portion of the reflector cup 111 of the light-emitting mechanism 11, and the edge portion of the reflector cup 111 is located below the support portion 3a. Thus, not only can the light-transmitting support member 3 be used to carry at least one optical film 12, but also the light-emitting mechanism 11 of the backlight module can be extended toward the accommodating space 35, so that the light emitted directly above by the light-emitting element 112 disposed in the edge area closer to the light-emitting mechanism 11 can be closer to the edge of the backlight module, thereby reinforcing the edge dark band of the backlight module, so that the light from the light-emitting mechanism 11 can be emitted after passing through the supporting portion 3a of the light-transmitting support member 3, thereby improving the light luminance of the edge area of the backlight module, thereby having the effect of avoiding the generation of dark bands at the edge of the light-emitting surface of the backlight module. In addition, the thickness of the rear end portion 3d of the light-transmitting support member 3 is greater than the thickness of the front end portion 3c, which also has the effect of increasing the structural strength of the light-transmitting support member 3.

Please refer to FIG. 7, which is a partial cross-sectional view of the display device of the present invention. The display device comprises: the aforementioned backlight module; an outer frame 22, which is combined with the back frame 21, and the outer frame 22 comprises a side wall segment 221 surrounding the optical unit 1 and a supporting segment 222 extending from the side wall segment 221 toward the optical unit 1; and a display panel The plate 4 is disposed on the supporting section 222, wherein the supporting section 222 and the plurality of light-transmitting support members 3 together clamp at least one optical film 12. In this way, the optical film 12 can be firmly clamped.

As mentioned above, the backlight module and display device with a light-transmitting support member of the present invention can not only ensure that the light emitted from the edge area of the optical unit can pass through the light-transmitting support member and then emit light, but also achieve the effect of improving the brightness of the light emitted from the edge area of the backlight module, so as to avoid the generation of dark bands at the edge of the light-emitting surface of the backlight module. Furthermore, the present invention can also directly embed the light-transmitting support member with its first limiting portion in the engaging slot hole set on the side panel, and the assembly and positioning of the light-transmitting support member can be completed without the additional use of adhesive tape; furthermore, the overall size of the multiple light-transmitting support members is relatively small compared to the size of the adhesive frame of the conventional direct-down backlight module. Therefore, the backlight module and display device with a light-transmitting support member of the present invention have the effects of improving the brightness of the light emitted from the edge area of the backlight module, lightweighting, reducing the cost of gluing, and reducing the overall working hours.

The above disclosed embodiments are only illustrative of the principles, features and effects of the present invention, and are not intended to limit the scope of the present invention. Any person skilled in the art may modify and change the above embodiments without violating the spirit and scope of the present invention. Any equivalent changes and modifications made using the contents disclosed in the present invention shall still be covered by the scope of the appended claims.

[List of Reference Numerals]
1: Optical unit
11: Light-emitting mechanism
111: Reflection cup
112: Light-emitting element
12: Optical film
2: Framework structure
21: Back frame
211: Bottom plate
212: Side panels
213: snap-fit slot
213a: Fixed segment
213b: Guide segment
214: latch
22: Frame
221: Side wall section
222: Bearing section
3: Translucent support
3a: Support part
3b: Joint
3c: Front end
3d: rear end
31: The first limiter
32: Second limiter
33: First surface
34: Second Surface
35: Accommodation space
4: Display Panel
D: Binding direction
X: Third direction
Y: Second direction
Z: First direction
(common use)
91: Light-emitting mechanism
92: Back frame
93: Plastic frame
94: Frame
95: Light Source
96: Reflection cup
97: Optical film.

Claims

A backlight module, comprising:

An optical unit having a light-emitting mechanism and at least one optical film;

A frame structure having a back frame, wherein the back frame has a bottom plate and a plurality of side plates extending from the bottom plate toward the at least one optical film, wherein the bottom plate is used to carry the light-emitting mechanism, and the side plates have engaging slots; and

A plurality of light-transmitting support members are used to jointly carry the at least one optical film. The light-transmitting support members have a first limiting portion detachably combined with the engaging slot hole to fix the light-transmitting support members on the side plate.
According to the backlight module according to claim 1, wherein the engaging slot has a fixed section and a guide section, the aperture of the guide section is larger than the aperture of the fixed section, and the first limiting portion slides from the guide section toward the coupling direction of the fixed section to be tightly coupled to the fixed section.
According to the backlight module according to claim 1, wherein the back frame also has a plurality of latching members extending from the bottom plate, and the light-transmitting support member also has a second limiting portion corresponding to the latching members, and the plurality of latching members are respectively aligned and combined with the second limiting portions of the plurality of light-transmitting support members to fix the plurality of light-transmitting support members to the bottom plate.
According to the backlight module according to claim 3, wherein the latch is a bending portion extending toward the side panel formed by convexing the bottom plate, and the second limiting portion is a groove extending along the coupling direction, and the groove is detachably coupled to the bending portion in the coupling direction.
According to the backlight module of claim 3, wherein the engaging slot has a fixed section and a guide section, the light-transmitting support has a first surface facing the side panel and a second surface located on the opposite side of the first surface, the second surface faces the light-emitting mechanism, the first surface forms the first limiting portion, the second surface forms the second limiting portion, the first limiting portion is embedded in the guide section of the engaging slot, and moves along the coupling direction so that the first limiting portion is tightly coupled to the fixed section, and the second limiting portion and the latch are engaged at the same time.
The backlight module according to claim 1, wherein the light-transmitting support member comprises A supporting portion carrying the at least one optical film and a coupling portion connected to the supporting portion, the coupling portion having a first surface facing the side panel and a second surface facing the light-emitting mechanism, the coupling portion protruding toward the side panel to form the first limiting portion, the coupling portion and the supporting portion cooperate with each other to form a containing space, the containing space accommodates the edge portion of the reflective cup of the light-emitting mechanism, and the edge portion of the reflective cup is located below the supporting portion.
The backlight module according to claim 6, wherein the combining portion has a front end portion connected to the supporting portion and a rear end portion connected to the front end portion, and the thickness of the rear end portion gradually decreases from its bottom surface toward the front end portion.
A display device, comprising:

The backlight module according to any one of claims 1 to 7;

An outer frame, which is combined with the back frame, and includes a side wall segment surrounding the optical unit and a bearing segment extending from the side wall segment toward the optical unit; and

The display panel is arranged on the supporting section, wherein the supporting section and the plurality of light-transmitting supporting members jointly clamp the at least one optical film.