CN213601015U

CN213601015U - Backlight device and display screen of leak protection light

Info

Publication number: CN213601015U
Application number: CN202022352270.2U
Authority: CN
Inventors: 唐运宝; 曾祥钦
Original assignee: Shenzhen Zhongxian Guangke Electronics Co ltd
Current assignee: Shenzhen Zhongxian Guangke Electronics Co ltd
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-07-02
Anticipated expiration: 2030-10-20

Abstract

The utility model belongs to the field of show technical equipment, especially, relate to a backlight device and display screen of leak protection light. The backlight device for preventing light leakage comprises a shell structure and a light guide structure. The shell structure comprises a heat dissipation piece with a placement cavity and a middle frame component, wherein the placement cavity is provided with an opening, and the middle frame component is connected with the heat dissipation piece at the opening. The light guide structure comprises a light source and a light guide plate with a light inlet end, the light guide plate is flatly laid in the arrangement cavity, the light source is arranged right opposite to the light inlet end and projects light rays towards the end face of the light inlet end; the shell structure further comprises a protruding portion protruding from the middle frame member, one end of the protruding portion extends towards the bottom of the accommodating cavity, and one end of the light source is located between the protruding portion and the wall of the accommodating cavity. The utility model discloses can avoid the light guide plate to destroy the light source in the installation, and can also reduce light and spill from the peripheral clearance of light guide plate, improve the quality of product.

Description

Backlight device and display screen of leak protection light

Technical Field

The utility model belongs to the field of show technical equipment, especially, relate to a backlight device and display screen of leak protection light.

Background

At present, the display screen need reserve the clearance that light guide plate self is heated inflation, and the size is big more, and the clearance is big more, just so can not all get into the light guide plate in the light that has the lamp strip to send, and partial light can spill from the light guide plate upper and lower edge, gets into the clearance of being shaded, and sees through the display screen gap, leads to the light leak phenomenon. Moreover, the display screen is at the in-process of production assembly, and after the lamp strip has been assembled, during the equipment leaded light subassembly, the lamp strip is touched easily at the edge of light guide plate to lead to the lamp strip to damage, cause the defective rate of product high, the production material is extravagant serious.

SUMMERY OF THE UTILITY MODEL

An object of the embodiments of the present application is to provide a backlight device for preventing light leakage, which aims to solve the problem of how to reduce light leakage at the light guide plate and improve the yield of products.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: provided is a backlight device preventing light leakage, including:

the heat sink comprises a shell structure and a heat dissipation part, wherein the shell structure comprises a heat dissipation part with a placement cavity and a middle frame component, the placement cavity is provided with an opening, and the middle frame component is connected with the heat dissipation part at the opening; and

the light guide plate is flatly arranged in the arrangement cavity, and the light source is arranged right opposite to the light inlet end and projects light rays towards the end face of the light inlet end;

the shell structure further comprises a protruding portion protruding from the middle frame member, one end of the protruding portion extends towards the cavity bottom of the placement cavity, and one end of the light source is located between the protruding portion and the cavity wall of the placement cavity.

In one embodiment, the protruding portion comprises a light shielding plate connected with the middle frame member and flatly arranged along the bottom of the installation cavity and a light barrier connected with the light shielding plate and extending towards the bottom of the installation cavity, and one end of the light source is located between the light barrier and the wall of the installation cavity.

In one embodiment, the shutter plate is integrally formed with the light barrier.

In one embodiment, a gap is formed between the free end of the light barrier and the cavity bottom of the setting cavity, and the light barrier and the end surface of the light incoming end are partially overlapped along the direction parallel to the cavity bottom of the setting cavity.

In one embodiment, the light barrier is disposed perpendicular to the light shield.

In one embodiment, the shading plate is provided with a positioning groove, and the open end of the heat radiating piece abuts against the bottom of the positioning groove to support the shading plate.

In one embodiment, the cavity wall of the installation cavity is concave towards the light source, and the light leakage prevention backlight device further comprises a heat conduction layer which is located in the concave and used for transferring heat of the light source to the heat dissipation member.

In one embodiment, the light source includes a circuit board abutting against the heat conduction layer and a lamp bead arranged on the circuit board and projecting light towards the light incident end.

In one embodiment, the light guide structure further includes a diaphragm and a reflective sheet, and the light shielding plate, the diaphragm, the light guide plate and the reflective sheet are sequentially stacked.

Another object of the present invention is to provide a display screen, which includes the backlight device of the light leakage prevention device as described above, the display screen further includes a display panel, the display panel is connected to the protruding portion.

The beneficial effect of this application lies in: a long and narrow protection interval is formed between the protruding part and the cavity wall of the placement cavity, and the light source can be arranged in the protection interval, so that the light source is prevented from being damaged by the light guide plate in the installation process, light can be reduced from leaking from the peripheral gap of the light guide plate, and the product quality is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a partial view of a cross-sectional view of a display screen provided by an embodiment of the present invention.

FIG. 2 is a schematic view, partially in section, of a center frame member and boss of the display screen of FIG. 1;

FIG. 3 is a schematic view, partially in section, of a heat sink of the display screen of FIG. 1;

fig. 4 is a partially cross-sectional schematic view of a display panel of the display screen of fig. 1.

Wherein, in the figures, the respective reference numerals:

100. a backlight device for preventing light leakage;

10. a housing structure;

11. a heat sink;

12. a boss portion;

13. a middle frame member;

111. a placement cavity;

112. positioning a groove;

113. a card slot;

20. a light guide structure;

21. a light source;

22. a reflective sheet;

23. a light guide plate;

24. a membrane;

211. a circuit board;

212. a lamp bead;

50. a display panel;

40. an adhesive layer;

60. a heat conductive layer;

121. a visor;

122. a light barrier;

131. a side plate;

211. a clamping part;

212. a concave surface;

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 and 3, an embodiment of the present invention provides a backlight device 100 for preventing light leakage, which is used in conjunction with a display panel 50. The display panel 50 is a photoelectric glass product formed by interlayer-packaging a liquid crystal film in a high-temperature and high-pressure manner, and a user can control the arrangement of liquid crystal molecules by controlling the voltage, thereby achieving the purpose of controlling the transparency and opacity of the glass and various brightness states. The backlight device 100 for preventing light leakage is used to irradiate light to the display panel 50 and is disposed opposite to the display panel 50. The backlight device 100 for preventing light leakage provides light with sufficient brightness and uniform distribution to the display panel 50, so that the display panel 50 can normally display images. The backlight device 100 for preventing light leakage has the characteristics of high brightness, long service life, uniform light emission, and the like. Alternatively, the light leakage preventing backlight device 100 includes a case structure 10 and a light guide structure 20. The case structure 10 includes a heat sink 11 having a seating cavity 111 and a middle frame member 13 to which the heat sink 11 is connected. The placement cavity 111 has an opening where the middle frame member 13 is connected to the heat sink 11. Alternatively, the middle frame member 13 includes a plurality of side plates 131, and the side plates 131 are connected end to form an annular frame for framing the display panel 50 and the heat sink 11. Alternatively, each side plate 131 may be integrally formed through an injection molding process, thereby facilitating mass production of the middle frame member 13. The light guide structure 20 includes a light source 21 and a light guide plate 23 having a light incident end, the light guide plate 23 is disposed in the disposition cavity 111 in a tiled manner, the light source 21 is disposed opposite to the light incident end and projects light toward an end surface of the light incident end, and optionally, the light source 21 is disposed adjacent to a cavity wall of the disposition cavity 111 and projects light toward the light incident end in a conductive state. The housing structure 10 further includes a protrusion 12 protruding from the inner surface of the middle frame 13, one end of the protrusion 12 extends toward the bottom of the accommodating cavity 111, and one end of the light source 21 is located between the protrusion 12 and the cavity wall of the accommodating cavity 111. Alternatively, the extending end of the protrusion 12 toward the bottom of the installation cavity 111 is located between the light incident end and the light source 21, so that the leakage of light from the gap between the light guide plate 23 and the heat sink 11 can be reduced.

It can be understood that an elongated protection region is formed between the protruding portion 12 and the cavity wall of the installation cavity 111, and the light source 21 can be disposed in the protection region, so as to prevent the light guide plate 23 from damaging the light source 21 during the installation process, and also reduce the light leakage from the gap around the light guide plate 23, thereby improving the product quality.

Referring to fig. 1 and 3, in an embodiment, the protruding portion 12 includes a light shielding plate 121 connected to the middle frame member 13 and disposed along the bottom of the disposing chamber 111 in a flat manner, and a light blocking plate 122 connected to the light shielding plate 121 and disposed to extend toward the bottom of the disposing chamber 111, and one end of the light source 21 is located between the light blocking plate 122 and the chamber wall of the disposing chamber 111. The light blocking plate 122 extends toward the bottom of the seating chamber 111 by a predetermined distance, thereby protecting the light source 21 and reducing the leakage of light.

Alternatively, the light-blocking panel 122, the light-blocking panel 121, and the side panels 131 are integrally formed.

In one embodiment, a gap is formed between the free end of the light barrier 122 and the bottom of the disposing cavity 111, and the light barrier 122 and the end surface of the light incident end are partially overlapped along a direction parallel to the bottom of the disposing cavity 111, optionally, the overlapping distance is 0.1mm to 0.5mm along the depth direction of the disposing cavity 111, so as to avoid affecting the light incidence rate of the light guide plate 23.

In one embodiment, the light barrier 122 is disposed perpendicular to the light shielding plate 121, that is, the height direction of the light barrier 122 is perpendicular to the plate surface of the light shielding plate 121, and the plate surface of the light barrier 122 is disposed parallel to the end surface such as the light end.

In one embodiment, the light shielding plate 121 defines a positioning groove 112, and the open end of the heat dissipating member 11 abuts against the bottom of the positioning groove 112 to support the light shielding plate 121. Optionally, the light shielding plate 121 is used for mounting the display panel 50, and the light shielding plate 121 is supported by the heat dissipation member 11, so that the display stability of the display panel 50 can be improved, and the heat dissipation member 11 is also beneficial to accurate positioning in the mounting process.

Referring to fig. 1 and fig. 3, in an embodiment, the cavity wall of the disposing cavity 111 is disposed in a concave surface 212 facing the light source 21, and the backlight device 100 for preventing light leakage further includes a heat conducting layer 60, wherein the heat conducting layer 60 is disposed in the concave surface 212 and is used for transferring heat of the light source 21 to the heat sink 11. Optionally, the heat conduction layer 60 is made of a material with good heat conduction performance, that is, the heat conduction material is filled in the concave surface 212, so that the heat of the light source 21 can be rapidly transferred to the heat dissipation member 11, and the wall of the placement cavity 111 provided by the concave surface 212 is formed, which can increase the contact area between the heat dissipation member 11 and the heat conduction layer 60, and increase the heat dissipation efficiency.

Optionally, the concave surface 212 is also provided to facilitate improvement of the plasticity of the heat sink 11 at the corresponding position, thereby facilitating the connection of the heat sink 11 with the middle frame member 13.

In one embodiment, the light source 21 includes a circuit board 211 abutting the heat conducting layer 60 and a lamp bead 212 disposed on the circuit board 211 and projecting light toward the light incident end.

Optionally, the lamp bead 212 is an LED lamp bead.

In one embodiment, the light guide structure 20 further includes a diaphragm 24 and a reflective sheet 22, and the light shielding plate 121, the diaphragm 24, the light guide plate 23 and the reflective sheet 22 are sequentially stacked.

Referring to fig. 4, the present invention further provides a display screen, the display screen includes a light-leakage-proof backlight device 100, the specific structure of the light-leakage-proof backlight device 100 refers to the above embodiments, and the light-leakage-proof backlight device 100 adopts all technical solutions of all the above embodiments, so that all the beneficial effects brought by the technical solutions of the above embodiments are also achieved, and are not repeated herein.

In one embodiment, the display screen further includes a display panel 50. The display screen further comprises an adhesive layer 40, wherein the adhesive layer 40 is used for adhering the display panel 50 to the light shielding plate 121.

Alternatively, the reflective sheet 22, the light guide plate 23 and the membrane 24 are sequentially disposed in the installation cavity 111, which is beneficial to the lightness and thinness of the display.

Optionally, the inner side surface of the middle frame structure is provided with a clamping groove 113, the outer side surface of the heat sink 11 is convexly provided with a clamping portion 211, and the clamping portion 211 is clamped in the clamping groove 113, so that the heat sink 11 and the middle frame member 13 can be conveniently mounted and dismounted.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims

1. A backlight device for preventing light leakage, comprising:

2. The backlight device for preventing light leakage of claim 1, wherein: the bulge comprises a light shielding plate and a light barrier, wherein the light shielding plate is connected with the middle frame component and is tiled at the bottom of the cavity of the placement cavity, the light barrier is connected with the light shielding plate and extends towards the bottom of the cavity of the placement cavity, and one end of the light source is located between the light barrier and the wall of the placement cavity.

3. The backlight device for preventing light leakage of claim 2, wherein: the light shielding plate is integrally formed with the light barrier.

4. The backlight device for preventing light leakage of claim 2, wherein: a gap is formed between the free end of the light barrier and the cavity bottom of the accommodating cavity, and the light barrier and the end face of the light incoming end are partially overlapped in the direction parallel to the cavity bottom of the accommodating cavity.

5. The backlight device for preventing light leakage of claim 2, wherein: the light barrier is perpendicular to the light screen.

6. The backlight device for preventing light leakage of claim 2, wherein: the shading plate is provided with a positioning groove, and the open end of the radiating piece is abutted to the bottom of the positioning groove to support the shading plate.

7. A light leakage preventing backlight device as claimed in any one of claims 1 to 6, wherein: the cavity wall of the placement cavity faces the position of the light source and is arranged in a concave surface mode, the backlight device for preventing light leakage further comprises a heat conduction layer, and the heat conduction layer is located in the concave surface and used for transferring heat of the light source to the heat dissipation piece.

8. A light leakage prevention backlight as claimed in claim 7, wherein: the light source comprises a circuit board which is abutted to the heat conducting layer and a lamp bead which is arranged on the circuit board and projects light towards the light inlet end.

9. A light leakage preventing backlight device as claimed in any one of claims 2 to 6, wherein: the light guide structure further comprises a diaphragm and a reflector plate, and the light shading plate, the diaphragm, the light guide plate and the reflector plate are sequentially stacked.

10. A display panel comprising the backlight device for preventing light leakage according to any one of claims 1 to 9, the display panel further comprising a display panel connected to the protrusion.