CN214011695U

CN214011695U - Backlight module and display device

Info

Publication number: CN214011695U
Application number: CN202120220977.XU
Authority: CN
Inventors: 黄冠智; 林彦庆; 林振宏
Original assignee: Coretronic Corp
Current assignee: Coretronic Corp
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-08-20
Anticipated expiration: 2031-01-27
Also published as: TWM615225U

Abstract

A backlight module comprises a back plate, a light emitting module and a light transmitting frame. The back plate has a bottom and a sidewall surrounding the bottom. The light emitting module is arranged on the bottom of the back plate and is suitable for providing an illuminating light beam. The light-transmitting frame body is provided with a light incident surface facing the light-emitting module, a light guide surface facing away from the light-emitting module and a light emergent surface positioned at the top of the light-transmitting frame body. The light-transmitting frame body comprises a first part and a second part, and the first part is arranged between the side wall and the light-emitting module. The light incident surface and the light guide surface are located on the first portion. The light-emitting surface is positioned on the second part, and the second part extends towards the direction far away from the side wall. The extension direction of the first portion is perpendicular to the extension direction of the second portion. A display device comprises the backlight module. The utility model provides a backlight module and display device has extremely narrow frame or no frame's visual effect.

Description

Backlight module and display device

Technical Field

The present invention relates to a light emitting module and an electronic device, and more particularly, to a backlight module and a display device.

Background

The liquid crystal display comprises a liquid crystal display panel and a backlight module. The backlight module can provide a surface light source to the liquid crystal display panel, so that a user can conveniently watch images displayed by the liquid crystal display panel. In general, a backlight module can be divided into a direct type backlight (direct type backlight) and a side type backlight (side type backlight).

In the current narrow-bezel display, a common practice is to use a plastic frame to carry a light guide element (such as a lateral light guide plate or a direct-type diffuser plate) and an optical film layer, and use the plastic frame and a buffer tape to carry a display panel, so as to achieve the purpose of narrow bezel of the display. However, because the rubber frame and the buffering rubber strip are opaque, the size of the frame in this way is limited by the width of the bearing surface of the rubber frame, and thus the effect of a narrow frame is still limited. At present, the design of the bearing surface of the rubber frame at least needs to be more than 1.0 mm. In addition, the display panel is placed on the bearing surface of the rubber frame, so that the precision requirement and the stability requirement on the assembly of the rubber frame are higher, and the rubber frame enters an effective luminous picture to shield display pixels due to slight deviation.

The background section is only provided to aid in understanding the present invention, and therefore the disclosure in the background section may include some prior art that does not constitute a part of the knowledge of those skilled in the art. The disclosure in the "background" section does not represent that content or the problems that may be solved by one or more embodiments of the present invention are known or appreciated by those skilled in the art prior to filing the present application.

SUMMERY OF THE UTILITY MODEL

The utility model provides a backlight module and display device has extremely narrow frame or no frame's visual effect.

Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

In order to achieve one or a part or all of the above or other purposes, the present invention provides a backlight module, which includes a back plate, a light emitting module and a light transmitting frame. The back plate has a bottom and a sidewall surrounding the bottom. The light emitting module is arranged on the bottom of the back plate and is suitable for providing an illuminating light beam. The light-transmitting frame body is provided with a light incident surface facing the light-emitting module, a light guide surface facing away from the light-emitting module and a light emergent surface positioned at the top of the light-transmitting frame body. The light-transmitting frame body comprises a first part and a second part, and the first part is arranged between the side wall and the light-emitting module. The light incident surface and the light guide surface are located on the first portion. The light-emitting surface is positioned on the second part, and the second part extends towards the direction far away from the side wall. The extension direction of the first portion is perpendicular to the extension direction of the second portion.

In order to achieve one or a part of or all of the above or other objects, the present invention further provides a display device, including a backlight module and a display module. The backlight module comprises a back plate, a light emitting module and a light transmitting frame. The back plate has a bottom and a sidewall surrounding the bottom. The light emitting module is arranged on the bottom of the back plate and is suitable for providing an illuminating light beam. The light-transmitting frame body is provided with a light incident surface facing the light-emitting module, a light guide surface facing away from the light-emitting module and a light emergent surface positioned at the top of the light-transmitting frame body. The light-transmitting frame body comprises a first part and a second part, and the first part is arranged between the side wall and the light-emitting module. The light incident surface and the light guide surface are located on the first portion. The light-emitting surface is positioned on the second part, and the second part extends towards the direction far away from the side wall. The extension direction of the first portion is perpendicular to the extension direction of the second portion. The display module is overlapped on the light-emitting surface of the light-transmitting frame body.

Based on the above, in the backlight module and the display device of the present invention, the backlight module includes a back plate, a light emitting module and a light transmitting frame. The light-transmitting frame body is arranged between the side wall of the back plate and the light-emitting module. The light-transmitting frame body comprises a first part and a second part, the second part extends towards the direction far away from the side wall, and the extending direction of the first part is perpendicular to the extending direction of the second part. Therefore, the light-transmitting frame body serving as a partial frame of the display device can also assist in transmitting the illumination light beams, so that a user can experience the frameless visual effect of the display device by observing.

In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

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

Fig. 2 is a schematic cross-sectional view of a portion of a display device according to another embodiment of the present invention.

Detailed Description

The foregoing and other features, aspects and utilities of the present invention will be apparent from the following more particular description of a preferred embodiment of the invention as illustrated in the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are referred to only in the direction of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.

Fig. 1 is a schematic cross-sectional view of a portion of a display device according to an embodiment of the present invention. Please refer to fig. 1. The display device 10 of the present embodiment includes a backlight module 100 and a display module 50, wherein the backlight module 100 is adapted to provide an illumination light beam L to the display module 50, and the display module 50 is disposed on the backlight module 100, wherein a stacking direction of the display module 50 and the backlight module 100 is a first direction D1. In the present embodiment, the display module 50 is, for example, a liquid crystal display panel or other non-self-luminous display panel. The display device 10 of the present embodiment is, for example, a borderless display, or a display module of a portable electronic device, such as a tablet computer or a smart phone, and a user can experience the borderless visual effect of the display device 10 when viewing the display, but the invention is not limited thereto.

In detail, the backlight module 100 includes a back plate 110, a light emitting module 120, and a light transmissive frame 130.

The back plate 110 has a bottom 112 and a sidewall 114 surrounding the bottom 112, and the sidewall 114 is perpendicular to the bottom 112 of the back plate 110. However, in other embodiments, the sidewall 114 of the back plate 110 may not be perpendicular to the bottom 112 of the back plate 110, but the invention is not limited thereto. Specifically, the sidewall 114 is connected to the bottom 112 and extends from the bottom 112 in a direction away from the bottom 112 (i.e., the first direction D1), and the sidewall 114 is composed of at least one side panel, for example.

In the present embodiment, the light emitting module 120 is disposed on the bottom 112 of the back plate 110 (i.e., the light emitting module 120 is disposed to overlap the bottom 112 of the back plate 110), and is adapted to provide the illumination light beam L, and the light emitting module 120 is a side-entry light emitting assembly. Specifically, the light emitting module 120 includes at least one light emitting element (not shown) and a light guiding element 122, the light guiding element 122 is disposed to overlap with the display module 50, the light emitting element is, for example, a light emitting diode (led) light bar or a plurality of leds, and the light guiding element 122 is, for example, a light guiding plate. However, in other embodiments, the light emitting module 120 may be a direct-type light emitting module, which is not limited to the present invention.

At least a portion of the light-transmitting frame 130 is disposed between the sidewall 114 of the back plate 110 and the light-emitting module 120. Specifically, the light-transmitting frame 130 includes a first portion 132 and a second portion 134, the first portion 132 is disposed between the sidewall 114 of the back plate 110 and the light-emitting module 120, the second portion 134 is connected to the first portion 132 and extends in a direction away from the sidewall 114 of the back plate 110, and an extending direction of the first portion 132 is perpendicular to an extending direction of the second portion 134. For example, the first portion 132 extends along a first direction D1, and the second portion 134 extends along a second direction D2, the first direction D1 being, for example, perpendicular to the second direction D2. In this embodiment, the cross section of the light-transmitting frame 130 is L-shaped (or inverted L-shaped), as shown in fig. 1, but in other embodiments, the cross section of the light-transmitting frame 130 may be designed to be T-shaped, which is not limited to this.

The light-transmitting frame 130 has a light-incident surface S1 facing the light-emitting module 120, a light-guiding surface S2 facing away from the light-emitting module 120, and a light-emitting surface S3 located at the top of the light-transmitting frame 130. Specifically, the light incident surface S1 and the light guiding surface S2 are located in the first portion 132, and the light emitting surface S3 is located in the second portion 134. Therefore, the first sub-beam L1 of the illumination beam L provided by the light emitting module 120 enters the first portion 132 through the light incident surface S1, and the first sub-beam L1 of the illumination beam L is transmitted to the second portion 134 through the light guide surface S2 of the first portion 132. Finally, the first partial sub-light beam L1 of the illumination light beam L transmitted to the second portion 134 exits through the light exit surface S3, and the light-transmitting frame 130 of the display device 10 can also assist in transmitting the illumination light beam L. In this way, the display module 50 of the display device 10 is overlapped on the light-emitting surface S3 of the transparent frame 130, the first partial sub-beam L1 emitted from the light-emitting surface S3 of the transparent frame 130 can provide the backlight of the edge region of the display module 50, and the second partial sub-beam L2 of the illumination beam L is emitted from the front view direction (i.e., the direction toward the display module 50) to provide the backlight required by the display module 50. Thus, the user may observe the very narrow-bezel or frameless visual effect of the display device 10.

In the present embodiment, the backlight module 100 further includes a light-transmissive adhesive member 140 disposed between the light-emitting module 120 and the light-incident surface S1 of the light-transmissive frame 130. Specifically, the light-transmissive adhesive 140 is connected to and covers the side surface S4 of the light guide element 122, and the side surface S4 is, for example, a side surface of the light guide element 122 facing the light-transmissive frame 130. Specifically, the first partial sub-beam L1 of the illumination beam L exits from the side S4 of the light emitting module 120 and is transmitted to the light transmissive frame 130 through the light transmissive adhesive member 140. As such, the light-transmissive adhesive member 140 is disposed to increase the stability of the light guide element 122 and the light-transmissive frame 130, and the light-transmissive adhesive member 140 reduces the scattering or refraction loss at the material interface to improve the light utilization efficiency.

In addition, in the embodiment, the backlight module 100 may further include a first buffer 150 disposed between the light guide surface S2 of the light transmissive frame 130 and the sidewall 114 of the back plate 110. In the present embodiment, the first buffer 150 is, for example, a coating with a gray scale distribution. Specifically, the first buffer 150 may distribute coatings with different gray scales at different heights of the backlight module 100 according to the incident angle of the light beam, so as to generate light absorption effects with different degrees. Therefore, the good display effect can be improved. In other embodiments. The first buffer 150 may be a reflective sheet, an atomizing layer, or a film with microstructures (e.g., a prism sheet or a beam splitter) suitable for guiding the light beam to the light emitting surface S3 more efficiently, but the invention is not limited thereto.

On the other hand, in the present embodiment, the backlight module 100 further includes a second buffer 160. The second cushion 160 is disposed on the light emitting surface S3 of the transparent frame 130 in an overlapping manner, and is disposed between the display module 50 and the transparent frame 130. Specifically, the second buffer 160 is a light-transmitting element, and the second buffer 160 may optionally include a plurality of diffusing particles therein. In this way, the illumination light beam L can be diffused or homogenized in other ways when being transmitted out of the light-transmitting frame 130 through the light-emitting surface S3, thereby providing a good display effect. In addition, a buffering effect can be obtained between the backlight module 100 and the display module 50. However, the present invention does not limit the material and light transmittance of the second buffer 160, and does not limit the concentration and type of the diffusion particles.

In an embodiment, the light-transmitting frame 130 may optionally include a plurality of diffusing particles therein, so as to obtain a uniform optical effect such as diffusion or other types of light beams passing through, thereby providing a good light-guiding effect and/or a good display effect. The utility model discloses do not restrict diffusion particle's concentration and kind.

In an embodiment, at least one of the light incident surface S1, the light guiding surface S2, and the light emitting surface S3 of the light transmissive frame 130 has a microstructure or an atomized surface. For example, an atomizing surface (different regions may have different degrees of atomization) may be disposed on the light incident surface S1 (all or part of the light incident surface S1) to generate a uniform optical effect such as diffusion or other types of light beams and guide the light beams to the light emitting surface S3. Alternatively, the light guide surface S2 may be configured with an atomizing surface to generate a uniform optical effect on the light beam transmitted to the light guide surface S2 and guide the light beam to the light emitting surface S3. Alternatively, the light emitting surface S3 may be configured with microstructures to improve the light intensity or collimation of the emitted light beam, thereby improving the good display effect. In an embodiment, the above embodiments can be combined arbitrarily to match according to the requirement, and the present invention is not limited thereto.

In the embodiment, the backlight module 100 may optionally include at least one optical film 170 disposed on the light emitting surface S3 of the light transmissive frame 130, and the at least one optical film 170 is adapted to improve the brightness and uniformity of the backlight. The optical film 170 is, for example, a prism sheet, a diffusion sheet, a brightness enhancement film or other functional films, but the invention is not limited thereto. In the embodiment, the second buffer member 160 is disposed on the optical film 170 in an overlapping manner, and is disposed between the display module 50 and the optical film 170, for example.

Fig. 2 is a schematic cross-sectional view of a portion of a display device according to another embodiment of the present invention. Referring to fig. 2, a display device 10A of the present embodiment is similar to the display device 10 shown in fig. 1. The difference between the two is that the second buffer 160A may be a metal or plastic member, and at least a portion of the second buffer 160A is disposed between the transparent frame 130 and the display module 50. Specifically, the second cushion 160A includes a first cushion portion 162 and a second cushion portion 164. The extending direction of the first buffer portion 162 is parallel to the second portion 134 of the transparent frame 130, the first buffer portion 162 is disposed between the transparent frame 130 and the display module 50, and specifically, the first buffer portion 162 is disposed between the display module 50 and the at least one optical film 170 and overlapped with the optical film 170. The second buffer portion 164 extends from the first buffer portion 162 and covers at least a portion of the sidewall 114, and in detail, the second buffer portion 164 covers at least a portion of a surface of the sidewall 114 away from the light emitting module 120. Thus, a good buffering effect can be obtained by the arrangement of the second cushion 160A, and a good appearance and protection effect can be obtained by the arrangement of the covering portion of the sidewall 114.

In an embodiment, the second buffer 160A may also be a light-transmitting element (or a semi-light-transmitting element) as shown in fig. 1, and the first buffer portion 162 of the second buffer 160A may further selectively extend and overlap the light-emitting surface S3 of the light-transmitting frame 130, and the second buffer 160A may include a plurality of diffusing particles therein, so that the passing light beam obtains a uniform optical effect such as diffusion or other types, and further provides a good display effect. The present invention is not limited thereto. Specifically, the optical film 170 may or may not selectively bear against the sidewall 114 of the back plate 110.

In summary, in the backlight module and the display device of the present invention, the backlight module includes a back plate, a light emitting module and a light transmitting frame. The light-transmitting frame body is arranged between the side wall of the back plate and the light-emitting module. The light-transmitting frame body comprises a first part and a second part, the second part extends towards the direction far away from the side wall, and the extending direction of the first part is perpendicular to the extending direction of the second part. Therefore, the light-transmitting frame body serving as a partial frame of the display device can also assist in transmitting the illumination light beams, so that a user can observe the extremely narrow frame or frameless visual effect of the display device.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, that is, all simple equivalent changes and modifications made according to the claims and the description of the present invention are still included in the scope of the present invention. Moreover, it is not necessary for any embodiment or claim to address all of the objects, advantages, or features disclosed herein. In addition, the abstract and the title are provided to assist the searching of patent documents and are not intended to limit the scope of the present invention. Furthermore, the terms "first," "second," and the like in the description or in the claims are used only for naming elements (elements) or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit on the number of elements.

Description of the symbols

10,10A display device

50 display panel

100,100A backlight module

110 back plate

112: bottom

114 side wall

120 light emitting module

122 light guide element

130 transparent frame

132 first part

134 second part

140 transparent adhesive member

150 first buffer

160,160A second buffer

162 first buffer part

164 second buffer part

170 optical film

D1 first direction

D2 second direction

L illumination beam

L1 first partial sub-beams

L2 second partial sub-beams

S1 incident surface

S2 light guide surface

S3 light emitting surface

S4, side surface.

Claims

1. A backlight module, characterized in that the backlight module comprises:

a back plate having a bottom and a sidewall surrounding the bottom;

a light emitting module disposed on the bottom of the back plate and adapted to provide an illumination beam; and

the light-transmitting frame body is provided with an orientation light-incoming surface, a back light-guiding surface and a light-outgoing surface, wherein the orientation light-incoming surface faces the light-emitting module, the back light-guiding surface is positioned at the top of the light-transmitting frame body, the light-transmitting frame body comprises a first part and a second part, the first part is arranged on the side wall and between the light-emitting modules, the light-incoming surface faces the light-guiding surface and is positioned on the first part, the light-outgoing surface is positioned on the second part, the second part faces away from the side wall and extends in the direction, and the extending direction of the first part is perpendicular to the extending direction of the second part.

2. The backlight module of claim 1, further comprising:

and the light-transmitting adhesive piece is arranged between the light-emitting module and the light-incoming surface, and the first part of sub-beams of the illumination beams are transmitted to the light-transmitting frame body by the light-emitting module through the light-transmitting adhesive piece.

3. The backlight module of claim 1, wherein the cross section of the light-transmissive frame is in an L-shaped structure.

4. The backlight module of claim 1, wherein the interior of the light transmissive frame comprises a plurality of diffusing particles.

5. The backlight module of claim 1, wherein at least one of the light incident surface, the light guiding surface and the light emitting surface of the light transmissive frame has a microstructure or an atomized surface.

6. The backlight module of claim 1, further comprising:

the first buffer piece is arranged between the light guide surface and the back plate of the light-transmitting frame body, wherein the first buffer piece is a reflector plate, an atomizing layer, a coating with gray scale distribution or a diaphragm with a microstructure.

7. The backlight module of claim 1, further comprising:

and the second buffer piece is overlapped and arranged on the light emergent surface of the light-transmitting frame body, wherein the second buffer piece is a light-transmitting element, and the inside of the second buffer piece comprises a plurality of diffusion particles.

8. The backlight module of claim 1, further comprising:

the second buffer piece is a metal piece or a plastic piece and comprises a first buffer part and a second buffer part, wherein the extending direction of the first buffer part is parallel to the extending direction of the second part, and the second buffer part extends from the first buffer part and covers at least one part of the side wall.

9. The backlight module of claim 2, wherein the light emitting module comprises at least one light emitting element and a light guiding element, and the light-transmissive adhesive member is connected to and covers a side surface of the light guiding element.

10. The backlight module of claim 1, further comprising:

at least one optical film, dispose in the said exit surface of the said light-transmitting frame; and

and the second buffer piece is overlapped and arranged on the at least one optical film, wherein the second buffer piece is a light-transmitting element, and the inside of the second buffer piece comprises a plurality of diffusion particles.

11. A display device, characterized in that the display device comprises:

a backlight module, comprising:

a back plate having a bottom and a sidewall surrounding the bottom;

the light-transmitting frame body is provided with a light-in surface facing the light-emitting module, a light-guiding surface facing away from the light-emitting module and a light-out surface positioned at the top of the light-transmitting frame body, the light-transmitting frame body comprises a first part and a second part, the first part is arranged between the side wall and the light-emitting module, the light-in surface and the light-guiding surface are positioned on the first part, the light-out surface is positioned on the second part, the second part extends in a direction far away from the side wall, and the extending direction of the first part is perpendicular to the extending direction of the second part; and

and the display module is overlapped and arranged on the light emergent surface of the light transmitting frame body.

12. The display device according to claim 11, wherein the backlight module further comprises a second buffer member disposed on the light-emitting surface of the light-transmissive frame in an overlapping manner, wherein the second buffer member is disposed between the light-transmissive frame and the display module.