CN111443525A

CN111443525A - Backlight module and display device

Info

Publication number: CN111443525A
Application number: CN202010315814.XA
Authority: CN
Inventors: 余冬庆
Original assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2020-07-24
Anticipated expiration: 2040-04-21
Also published as: CN111443525B

Abstract

The application provides a backlight module and a display device, wherein the backlight module comprises a fixed frame, a light source, a light guide plate and a reflector plate, wherein a placing groove and an opening are formed in the fixed frame; the light source is arranged on one side of the placing groove; the light guide plate is arranged on the light emergent side of the light source, the light guide plate is provided with a first through hole, and the light guide plate comprises a connecting surface; the reflector plate is arranged on the connecting surface of the light guide plate, and the reflector plate is provided with a second through hole; the fixing frame comprises a partition plate, the partition plate is arranged on the placing groove in a protruding mode and surrounds the outer peripheral side of the opening, and the partition plate is located in the first through hole and the second through hole; the reflecting sheet comprises reflecting convex sheets, the reflecting convex sheets are arranged along the peripheral direction of the second through hole and are positioned on the peripheral side of the partition board, at least parts of the reflecting convex sheets are positioned on one side of the partition board back to the light source, and the reflecting surfaces of the reflecting convex sheets face the light guide plate. The application makes light radiate to the reflection convex piece by arranging the reflection convex piece on the reflection sheet, and the light is reflected to the backlight side of the light guide plate so as to compensate the brightness of the backlight side of the light guide plate.

Description

Backlight module and display device

Technical Field

The application relates to the technical field of display, in particular to a backlight module and a display device.

Background

With the development of display technology, the display requirements and effects of current display devices such as mobile phones are increasingly sought, and especially, full-face screens with increasingly high screen ratio requirements, such as perforated irregular screens, are required.

In the current small and medium-sized liquid crystal display modules, the backlight sources of mobile phones, tablet computers and notebook computers are side-in type light emitting. In the existing special-shaped structures such as punching, the part of the opening position back to the light source is inevitably subjected to light source dark space due to the fact that light cannot be directly irradiated, and the liquid crystal display screen is not uniform in display due to uneven distribution of light.

Disclosure of Invention

The embodiment of the application provides a backlight module and a display device, which are used for solving the technical problem that the part of the backlight module, which faces away from a light source, generates a dark space at the hole opening position of the existing hole-punching type display module.

The embodiment of the application provides a backlight unit, it includes:

the fixing frame is provided with a placing groove and an opening, and the opening penetrates through the placing groove;

a light source disposed at one side of the placement groove;

the light guide plate is arranged in the placing groove and is positioned on the light emitting side of the light source, the light guide plate comprises a light guide plate main body, a first through hole is formed in the light guide plate main body, the first through hole and the opening are correspondingly arranged, and the light guide plate main body comprises a light emitting surface and a connecting surface which are oppositely arranged; and

the reflecting sheet is arranged on the connecting surface of the light guide plate main body and comprises a reflecting sheet main body, a second through hole is formed in the reflecting sheet main body, and the second through hole is arranged corresponding to the first through hole;

the fixing frame comprises an annular partition plate, the partition plate is arranged on the placing groove in a protruding mode and surrounds the outer peripheral side of the opening, and the partition plate is located on the inner peripheral side of the first through hole and the second through hole;

the reflection sheet further comprises a reflection convex sheet convexly arranged on the reflection sheet main body, the reflection convex sheet is arranged along the peripheral direction of the second through hole and is positioned on the outer peripheral side of the partition board, at least part of the reflection convex sheet is positioned on one side, back to the light source, of the partition board, and the reflection surface of the reflection convex sheet faces the light guide plate.

In the backlight module of the embodiment of the application, the fixing frame comprises a corner, and the corner is arranged on one side of the fixing frame, which is far away from the light source, and is close to the opening;

the height of the reflecting convex sheet decreases from one end close to the corner to one end far away from the corner.

In the backlight module according to the embodiment of the present application, the reflective sheet further includes a plurality of microstructures, the plurality of microstructures are used for diffusing incident light, and the plurality of microstructures are disposed on the reflective surface of the reflective tab.

In the backlight module of the embodiment of the application, the microstructure is a concave lens.

In the backlight module of the embodiment of the application, the reflection sheet main body and the reflection convex sheet are of an integrally formed structure.

In the backlight module according to the embodiment of the application, the light guide plate further includes a plurality of dots, the plurality of dots are fixedly arranged on the connecting surface, the portion of one side of the light source, which is back to the first through hole, is a backlight portion, and the dots are located at the density of the backlight portion, which is greater than the density of the other portions of the light guide plate.

In the backlight module of the embodiment of the application, the opening, the first through hole and the second through hole are round holes, and the partition plate is annular.

In the backlight module according to the embodiment of the present application, the reflective protruding piece has an arc shape.

In the backlight module of the embodiment of the application, the backlight module further comprises an optical film, and the optical film is arranged on the light-emitting surface of the light guide plate.

The embodiment of the application also relates to a display device, which comprises the backlight module and the display panel, wherein the display panel is arranged on the backlight module.

The application discloses backlight unit is through setting up the reflection lug on the reflector plate to make the light radiation in the light guide plate to the reflection lug, reflected one side (the side of being shaded) that the light source was kept away from to the trompil in the light guide plate, with the partial luminance of compensating first through-hole position dorsad light source in the light guide plate, thereby improved the homogeneity of light guide plate face light-emitting.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required in the embodiments are briefly described below. The drawings in the following description are only some embodiments of the present application, and it will be obvious to those skilled in the art that other drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view taken along line AA in FIG. 1;

FIG. 3 is an exploded view of a backlight module according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a reflector of a backlight module according to an embodiment of the present disclosure;

fig. 5 is a schematic bottom view of a light guide plate of a backlight module according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present application; FIG. 2 is a schematic cross-sectional view taken along line AA in FIG. 1; fig. 3 is an exploded view of a backlight module according to an embodiment of the disclosure.

The backlight module 100 of the present embodiment includes a fixing frame 11, a light source 12, a light guide plate 13, a reflective sheet 14, and an optical film 15. The light source 12 is disposed at one side inside the fixing frame 11. The reflection sheet 14 is provided inside the fixing frame 11. The light guide plate 13 is disposed on the light exit side of the light source 12 and on the reflective sheet 14. The optical film 15 is disposed on the light exit surface 13a of the light guide plate 13.

Specifically, the fixed frame 11 is provided with a placement groove 111 and an opening 112, and the opening 112 penetrates the placement groove 111. The light source 12 is disposed at one side of the placement groove 111.

The light guide plate 13 is disposed in the placement groove 111 and on the light exit side of the light source 12. The light guide plate 13 includes a light guide plate body 131. The light guide plate body 131 is formed with a first through hole 132, and the first through hole 132 and the opening 112 are correspondingly disposed. The light guide plate body 131 includes a light exit surface 13a and a connection surface 13b that are oppositely disposed.

The reflective sheet 14 is disposed on the connection surface 13b of the light guide plate body 131. The reflection sheet 14 includes a reflection sheet body 141. The reflection sheet main body 141 is provided with a second through hole 142, and the second through hole 142 is disposed corresponding to the first through hole 132.

The fixing frame 11 includes an annular partition 113, the partition 113 is protruded on the placing groove 111 and surrounds the outer circumference side of the opening 112, and the partition 113 is located on the inner circumference side of the first through hole 132 and the second through hole 142.

The reflection sheet 14 further includes reflection tabs 143 protruded on the reflection sheet main body 141. The reflective tabs 143 are provided along the outer circumferential direction of the second through hole 142 and are positioned on the outer circumferential side of the partition 113. At least part of the reflective tabs 143 are located on a side of the partition 113 facing away from the light source 12. The reflective surface of the reflective tab 143 faces the light guide plate 13.

Alternatively, the reflective sheet main body 141 and the reflective tabs 143 are of an integrally molded structure. Such an arrangement improves the stability of the coupling of the reflection sheet main body 141 and the reflection tabs 143.

In the backlight module 100 of the present embodiment, the reflective tab 143 is disposed on the reflective sheet 14, so that the light in the light guide plate 13 is radiated to the reflective tab 143 and reflected to a side (backlight side) of the opening 112 in the light guide plate 13 away from the light source 12, so as to compensate a portion of the luminance of the light emitted from the light source 12 at the position of the first through hole 132 in the light guide plate 13, thereby improving the uniformity of the light emitted from the light guide plate 13.

Specifically, since the partition 113 is disposed around the outer periphery of the opening 112, the light of the light source 12 cannot be directly radiated to the side of the partition 113 facing away from the light source 12, so that the light of the light source 12 cannot be directly radiated to the portion of the light guide plate 13 located at the partition 113 facing away from the light source 12, which is defined as a backlight portion in the present embodiment. In the backlight module 100 of the present embodiment, the reflective protruding pieces 143 are disposed on the backlight side of the partition 113, and the light radiated to the reflective protruding pieces 143 is reflected to the backlight portion of the light guide plate 13 by using the light guiding function inside the light guide plate 13, so as to compensate the luminance of the backlight portion, thereby improving the uniformity of the light emitted from the surface of the light guide plate 13.

In some embodiments, the reflective tabs 143 further comprise another reflective surface that faces the baffle. By the arrangement, the light emitting uniformity of the light guide plate surface is further improved.

In some embodiments, the reflective tabs 143 are disposed around an annular baffle. That is, the reflective protrusion 143 is annular and fitted around the outer periphery of the partition plate.

In the backlight module 100 of the present embodiment, referring to fig. 1 and fig. 4, the fixing frame 11 includes a corner R, and the corner R is disposed on a side of the fixing frame 11 away from the light source 12 and close to the opening 112.

The height of the reflective tabs 143 decreases from the end near the corner R to the end away from the corner R. Since the corner R is closest to the partition 113, the brightness of the portion of the light guide plate 13 near the corner R is darkest. The height of the reflective tabs 143 is gradually changed to reflect and compensate the non-equal amount of light, so that the light emitted from the backlight portion is more uniform.

The higher the height of the reflective tabs 143 is, the larger the light reflection area is, and the better the light compensation effect is, and the worse the light compensation effect is. Therefore, the present embodiment can adjust the height of the reflective tabs 143 according to the actual lighting conditions.

Optionally, the opening 112, the first through hole 132, and the second through hole 142 are all round holes. The partition 113 has an annular shape. The reflective tab 143 has an arc shape. The shape of the opening 112, the first through hole 132 and the second through hole 142 may also be square, triangular or other shapes, and the embodiment is not limited. The shape of the partition 113 may be adjusted accordingly according to the shape of the opening 112. The shape of the reflective tabs 143 may be adjusted accordingly to the shape of the partition 113.

Further, referring to fig. 4, the reflective sheet 14 further includes a plurality of microstructures 144, and the microstructures 144 are used for diverging the incident light. A plurality of microstructures 144 are disposed on the reflective surface 14a of the reflective tab 143.

The arrangement of the microstructures 144 further enhances the light compensation effect for the backlight portion. When the light is radiated to the microstructure 144, the microstructure 144 performs a divergent process on the light, so that the incident angle of the light is enlarged; then, the divergently processed light is radiated onto the reflecting surface 14a of the reflecting tab 143 and reflected by the reflecting surface 14a, thereby enlarging the reflecting angle of the reflected light and further improving the light compensation effect for the backlight portion.

Alternatively, the microstructure 144 is a concave lens, but is not limited thereto.

In the backlight module 100 according to the embodiment of the present disclosure, referring to fig. 5, the light guide plate 13 further includes a plurality of dots 133, and the plurality of dots 133 are fixedly disposed on the connecting surface 13 b.

A portion of the light guide plate body 131 on a side of the first through hole 132 facing away from the light source 12 is a backlight portion. The density of the dots 133 at the backlight portion is greater than that of the dots 133 at other portions of the light guide plate body 131. The backlight portion is the same as the backlight portion described above.

Note that the other portion of the light guide plate body 131 is all the area of the light guide plate body 131 except the backlight portion.

The present embodiment improves the brightness of the backlight portion by differentiating the density of the dots 133, so that the light emitted from the surface of the light guide plate 13 has uniformity. In addition, in the present embodiment, the density of the dots 133 and the height of the reflective tabs 143 may be cooperatively set. That is, when the dot 133 density of the backlight portion is large, the height of the reflective tabs 143 can be adjusted to be low accordingly, so that the light emitted from the surface of the light guide plate 13 has uniformity. And vice versa.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present application. The embodiment of the present application further relates to a display device 1000, and the display device 100 includes the backlight module 100 and the display panel 200 according to the above embodiment. The display panel 200 is disposed on the backlight module 100.

The backlight module 100 of the display device 1000 of the present embodiment has a similar or identical structure to the backlight module 100 of the previous embodiment, and please refer to the content of the backlight module 100 of the previous embodiment, which is not repeated herein.

The backlight module and the display device provided by the embodiment of the present application are described in detail above, and a specific example is applied to illustrate the principle and the implementation manner of the present application, and the description of the embodiment is only used to help understanding the technical scheme and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A backlight module, comprising:

a light source disposed at one side of the placement groove;

2. The backlight module according to claim 1, wherein the fixing frame comprises a corner disposed at a side of the fixing frame away from the light source and close to the opening;

3. The backlight module according to claim 1, wherein the reflective sheet further comprises a plurality of microstructures for diverging the incident light, the plurality of microstructures being disposed on the reflective surface of the reflective tab.

4. A backlight module according to claim 3, wherein the microstructures are concave lenses.

5. The backlight module as claimed in claim 1, wherein the reflective sheet main body and the reflective tabs are of an integrally formed structure.

6. The backlight module according to claim 1, wherein the light guide plate further comprises a plurality of dots, the dots are fixedly disposed on the connecting surface, a portion of the light guide plate body on a side of the first through hole facing away from the light source is a backlight portion, and a density of the dots on the backlight portion is greater than a density of the dots on other portions of the light guide plate body.

7. The backlight module as claimed in claim 1, wherein the opening, the first through hole and the second through hole are circular holes, and the partition is annular.

8. The backlight module as claimed in claim 7, wherein the reflective tabs are rounded.

9. The backlight module as claimed in claim 1, further comprising an optical film disposed on the light-emitting surface of the light guide plate.

10. A display device, comprising the backlight module according to any one of claims 1 to 9 and a display panel disposed on the backlight module.