CN108279533B

CN108279533B - Backlight module and display device

Info

Publication number: CN108279533B
Application number: CN201810150898.9A
Authority: CN
Inventors: 王彦明; 刘岗; 王翠娥; 包欢; 王立冬; 杨明; 刘蕊; 王大威
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Priority date: 2018-02-13
Filing date: 2018-02-13
Publication date: 2021-04-30
Anticipated expiration: 2038-02-13
Also published as: CN108279533A

Abstract

The embodiment of the invention provides a backlight module and a display device, relates to the technical field of display, and can reduce poor display caused by prism deformation. The backlight module comprises a frame, a light guide plate, a diffusion film, a second prism film, a first prism film, a light bar and a shading adhesive tape; the first prismatic film includes a first body portion and a first lug; the second prism film includes a second body portion and a second lug; the diffusion film is not overlapped with the first lug and the second lug; on one side close to the light bar, the first lug is positioned above the second lug; the frame comprises four side walls; except the light bar side, the top ends of the other three side walls are lower than the top end of the prism in the first main body part, and the height difference is smaller than the thickness of the shading adhesive tape; the light-shielding tape is not in contact with the first body portion; the shading adhesive tape is at least adhered to the side wall close to the lamp strip, the lamp strip and the first lug, and the absolute value of the thickness difference between the shading adhesive tape and the diffusion film is smaller than the thickness of the shading adhesive tape. The method is used for preparing the backlight module and the display device.

Description

Backlight module and display device

Technical Field

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

Background

A Liquid Crystal Display (LCD) device generally includes a display Panel (Panel) and a backlight assembly. An upper prism film and a lower prism film are sequentially arranged below the black shading adhesive tape in the shape of a Chinese character 'hui' on the outer side of the backlight module, and the upper prism film is bonded with a lower polarizer in the display panel through the shading adhesive tape.

In order to ensure the viscosity of the light-shielding tape, the light-shielding tape usually has a certain thickness, so that a larger gap is formed between the upper prism film and the lower polarizer, and when the light-shielding tape is torn off to protect the optical film in the backlight module and then is attached to the display panel, the upper prism film and the lower Polarizer (POL) of the display panel can generate electrostatic adsorption. The upper prism film is convex in shape due to the large Gap (Gap) therebetween. The opening area in the middle of the shading adhesive tape is usually rectangular, the prism is convexly deformed to form a rectangle with a round angle, and the shapes of a circle, an ellipse and the like can also appear under the influence of the adsorption area, so that the display effect is influenced.

In addition, the large gap may cause irregular arching between the upper prism film and the lower prism film after the display device is tested correspondingly, and cause abrupt change of the prism Pitch (Pitch) at the edge of the deformed boundary, so that the emergent light angle is changed and interference is generated, thereby causing an annular display unevenness phenomenon in the display area of the display device and a phenomenon of newton rings (or referred to as "newton rings") along with rainbow texture.

Disclosure of Invention

In view of this, embodiments of the present invention provide a backlight module and a display device, which can reduce the display defects of the display device caused by prism deformation in the backlight module.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect, an embodiment of the present invention provides a backlight module, including: the light guide plate comprises a frame, a light guide plate, a diffusion film, a second prism film, a first prism film, a light bar and a shading adhesive tape, wherein the diffusion film, the second prism film and the first prism film are sequentially arranged on the light guide plate; wherein the first prism film includes: a first body portion and a first lug extending therefrom; the first lug is at least positioned on one side of the first body part close to the light bar; the second prism film includes: a second body portion and a second lug extending therefrom; the second lug is at least positioned on one side of the second body part close to the light bar; the diffusion membrane is not overlapped with the first lug and the second lug; on one side close to the light bar, the first lug is positioned above the second lug; the frame includes: four side walls; the top ends of the other three side walls except the side wall close to one side of the light bar are lower than the top end of the prism in the first main body part, and the height difference of the top ends is smaller than the thickness of the shading adhesive tape; the light-shielding tape is not in contact with the first body portion; the shading adhesive tape is at least stuck on the side wall close to one side of the light bar, the light bar and the first lug, and the absolute value of the thickness difference between the shading adhesive tape and the diffusion film is smaller than the thickness of the shading adhesive tape.

Optionally, the backlight module further includes: the light bar glue is used for sticking the light bar on the edge of the light-emitting surface of the light guide plate; the light bar glue extends to form a light bar glue extending part which is not covered by the light bar; on one side close to the light bar, the length of the second lug in the extending direction is larger than that of the first lug in the extending direction, and a partial area, which is not covered by the first lug, of the second lug in the extending direction is adhered to the light bar glue extending part.

Optionally, the backlight module further includes: the light shading block is arranged on the diffusion film and positioned among the first main body part, the second main body part and the light bar; the frame includes: the outer frame and the rubber frame are positioned between the outer frame and the light guide plate; the outer frame includes: four first sub-sidewalls; the frame of gluing includes: at least two second opposite sub-sidewalls; at least the side wall near one side of the light bar and near the opposite side of the light bar comprise: the first sub-sidewall and the second sub-sidewall; the upper surface of the shading block, which is far away from the diffusion film, is flush with the top end of the second sub-side wall in the side wall close to one side of the light bar; or the frame is a rubber frame; the upper surface of the shading block, which is far away from the diffusion film, is flush with the top end of the side wall, which is close to one side of the light bar.

Optionally, the first lug is further located on a side of the first body portion adjacent to at least one of the remaining three of the side walls, and/or the second lug is further located on a side of the second body portion adjacent to at least one of the remaining three of the side walls; the top end of at least one of the other three side walls is provided with a groove which is used for accommodating the adjacent first lug and/or the second lug; the shading adhesive tape is further pasted on the top end of the side wall provided with the groove and at least one of the first lug and the second lug in the groove; except for the side close to the light bar, for the condition that the first lug and the second lug are both positioned on the same side of the light guide plate, the first lug and the second lug are arranged in a staggered mode, or the first lug is positioned on the second lug, and the length of the second lug in the extending direction is larger than that of the first lug in the extending direction.

In a second aspect, an embodiment of the present invention provides another backlight module, including: the light guide plate comprises a frame, a light guide plate, a diffusion film, a second prism film, a first prism film, a light bar and a shading adhesive tape, wherein the diffusion film, the second prism film and the first prism film are sequentially arranged on the light guide plate; wherein the first prism film includes: a first body portion and a first lug extending therefrom; a region where the diffusion membrane does not overlap the first tab; the frame includes: four side walls; the top ends of the other three side walls except the side wall close to one side of the light bar are lower than the top end of the prism in the first main body part, and the height difference of the top ends is smaller than the thickness of the shading adhesive tape; the top end of at least one of the other three side walls is provided with a groove, and the groove is used for accommodating the adjacent first lug; the light-shielding tape is not in contact with the first body portion; the shading adhesive tape is at least adhered to the side wall close to one side of the light bar, the top end of the side wall provided with the groove and the first lug positioned in the groove.

Optionally, the second prism film includes: a second body portion and a second lug extending therefrom; a region where the diffusion membrane does not overlap the second tab; the groove is also used for accommodating the second lug which is close to the groove; for the case that the first lug and the second lug are positioned on different sides of the light guide plate, the first lug and the second lug are respectively accommodated in the grooves of different side walls; for the case that the first lug and the second lug are positioned on the same side of the light guide plate, the first lug and the second lug are accommodated in the groove of the same side wall; the first lug and the second lug are arranged in a staggered mode, or the first lug is positioned on the second lug, and the length of the second lug in the extending direction is larger than that of the first lug in the extending direction.

In a third aspect, an embodiment of the present invention provides a backlight module, including: the light shading adhesive tape comprises a frame, a diffusion plate, a diffusion film, a second prism film, a first prism film and a light shading adhesive tape, wherein the diffusion film, the second prism film and the first prism film are sequentially arranged on the diffusion plate; wherein the first prism film includes: a first body portion and a first lug extending therefrom; a region where the diffusion membrane does not overlap the first tab; the frame includes: four side walls; the top end of the side wall is lower than the top end of the prism in the first main body part, and the lower height difference is smaller than the thickness of the shading adhesive tape; the top end of at least one side wall is provided with a groove which is used for accommodating the adjacent first lug; the light-shielding tape is not in contact with the first body portion; the shading adhesive tape is at least adhered to the top end of the side wall provided with the groove and the first lug positioned in the groove.

Optionally, the second prism film includes: a second body portion and a second lug extending therefrom; a region where the diffusion membrane does not overlap the second tab; the groove is also used for accommodating the second lug which is close to the groove; for the case that the first lug and the second lug are positioned on different sides of the diffusion plate, the first lug and the second lug are respectively accommodated in the grooves of different side walls; for the case where the first lug and the second lug are located on the same side of the diffuser plate, the first lug and the second lug are received in the groove of the same sidewall; the first lug and the second lug are arranged in a staggered mode, or the first lug is positioned on the second lug, and the length of the second lug in the extending direction is larger than that of the first lug in the extending direction.

Optionally, for one side of the first body portion extending out of the first lug, the first lug is distributed at two end edges of the one side; and/or, for one side of the second body portion from which the second lug extends, the second lug is distributed at both end edges of the one side.

In a fourth aspect, an embodiment of the present invention provides a display device, including a liquid crystal display panel; the liquid crystal display panel includes: the display panel comprises a first polarizer positioned on a display side and a second polarizer far away from the display side; the display device further includes: the backlight module of any one of the above; the shading adhesive tape in the backlight module is also adhered to the second polarizer.

Based on this, through the backlight module provided by the embodiment of the present invention, the frame is sunk and the light-shielding tape is narrowed to prevent the light-shielding tape from contacting the top end of the prism of the first prism film, and the diffusion film is improved on the side of the light bar, so that the gap between the first prism film and the lower polarizer of the display panel can be reduced, even the gap between the first prism film and the lower polarizer of the display panel can be removed, so that the first prism film is directly contacted with the lower polarizer of the display panel, and at least the first prism film can be fixed, and the fixed second prism film below the first prism film is pressed by the fixed first prism film, so that the backlight module and the display panel are fixed in a sticking manner, thereby reducing or even eliminating poor display of the display device caused by the deformation of the prism in the backlight module.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic cross-sectional structure diagram of a backlight module according to embodiment 1 of the present invention;

FIG. 2a is a schematic diagram of a conventional prism film;

FIG. 2b is a schematic diagram of a second conventional prism film;

FIG. 3 is a schematic diagram of a prism film for enhancing light;

FIG. 4a is a schematic cross-sectional view of a prior art LCD device;

FIG. 4b is a schematic diagram of a partial top view of the backlight module corresponding to FIG. 4 a;

FIG. 5a is a schematic cross-sectional view illustrating a liquid crystal display device after Newton's ring phenomenon occurs in the prior art;

FIG. 5b is a schematic diagram of a partial top view of the backlight module corresponding to FIG. 5 a;

fig. 6 is a schematic cross-sectional structure diagram of a backlight module according to embodiment 1 of the present invention;

fig. 7 is a schematic view of an assembly process of a backlight module according to embodiment 1 of the present invention;

fig. 8 is a schematic partial enlarged view of a backlight module according to embodiment 1 of the present invention;

fig. 9 is a schematic cross-sectional structure diagram of a backlight module according to embodiment 1 of the present invention;

fig. 10 is a cross-sectional structure diagram of a backlight module according to embodiment 1 of the present invention;

fig. 11 is a schematic cross-sectional structure view of a backlight module according to embodiment 2 of the present invention;

FIG. 12 is a schematic cross-sectional view of a prior art LCD device;

fig. 13 is a first schematic cross-sectional view illustrating a display device according to embodiment 3 of the present invention;

fig. 14 is a schematic cross-sectional structure diagram of a display device according to embodiment 3 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.

For example, the terms "first," "second," and the like as used in the description and in the claims of the present patent application do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "upper/upper", "lower/lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only used for simplifying the description of the technical solution of the present invention, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.

Example 1

As shown in fig. 1, an embodiment 1 of the present invention provides a backlight module, including: the light guide plate comprises a frame, a light guide plate 10, a diffusion film 20, a second prism film 32 and a first prism film 31 which are sequentially arranged on the light guide plate 10, a light bar 40 arranged on one side of a light incident surface of the light guide plate 10 and a shading adhesive tape 50 arranged on the frame; wherein the first prism film 31 includes: a first body portion 310 and a first lug 311 extending therefrom; first lug 311 is located on at least one side of first body portion 310 adjacent to light bar 40; the second prism film 32 includes: a second body portion 320 and a second lug 321 extending therefrom; second lug 321 is located on at least one side of second body portion 320 adjacent to light bar 40; the diffusion film 20 has no overlapping region with the first lug 311 and the second lug 321; on the side close to the light bar, the first lug 311 is located above the second lug 321; the frame includes: four side walls 60; except for the side wall 60 close to one side of the light bar 40, the top ends of the other three side walls 60 are lower than the top end of the prism in the first body part 310, and the height difference of the lower ends is smaller than the thickness of the shading tape 50; the light shielding tape 50 is not in contact with the first body portion 310; the shading adhesive tape 50 is at least adhered to the side wall 60 close to one side of the light bar 40, the light bar 40 and the first lug 311, and the absolute value of the thickness difference between the shading adhesive tape 50 and the diffusion film 20 is smaller than the thickness of the shading adhesive tape 50.

To more clearly illustrate the specific structure of the backlight module provided in embodiment 1 of the present invention, the following first describes the specific structure of the prism film and the generation of the newton ring phenomenon in the prior art.

Many tiny prism structures which are arranged in parallel are distributed on the upper surface of a prism Film (BEF), and the extending direction of the prism structures is a prism angle.

As shown in fig. 2a, the prism structures may be arranged in such a manner that the heights (Height, H in the drawing) of the prism structures are the same, the pitches (Pitch, P in the drawing) are the same, and the prism tips are the planes on which the ridges of the prism structures are located.

Alternatively, the arrangement of the prism structures distributed on the upper surface of the prism film may be as shown in fig. 2b, wherein a prism structure with a larger Height (Height 2, in the figure, marked as H2) is inserted between a plurality of prism structures with a small Height (Height 1, in the figure, marked as H1) and a small Pitch (Pitch1, in the figure, marked as P1), and the Pitch (Pitch 2, in the figure, marked as P2) between two adjacent prism structures with a Height of H2 is wider. In this configuration, the top of the prism is the plane in which the ridges of each prism structure have the greatest height.

As shown in fig. 3, the light is refracted by the prism structure, and the emergent light angle is converged, thereby achieving the effect of enhancing the brightness of the light emitted by the backlight module. To maximize brightness enhancement, the upper and lower prism angles in the backlight module are typically arranged vertically.

As shown in fig. 4a, in the prior art, the light shielding tape 50 is generally hollowed out to allow light emitted from a VA region (View Area) of the backlight module 01 to further irradiate the display panel 02 for displaying, and the light shielding tape 50 is adhered between the lower polarizer 104 and the upper prism film 31 of the display panel 02.

As shown in fig. 4b, a solid line in a vertical direction in the drawing indicates an upper prism angle, a dotted line in a horizontal direction indicates a lower prism angle, and when the upper prism film 31 and the lower prism film 32 are not deformed, the prism pitch is uniform and constant, and no interference phenomenon occurs.

As shown in fig. 5a and 5b, when the upper and lower prism films are irregularly arched, a prism gap reduction region (marked as S1) and a prism gap expansion region (marked as S2) are generated, so that the prism Pitch (Pitch) at the deformation boundary edge is suddenly changed, the emergent light angle is changed, and the light interference phenomenon is generated in both the gap reduction region (S1) and the gap expansion region (S2), so that the annular display unevenness phenomenon occurs in the display region of the display device, and the rainbow texture, that is, the newton ring is generated.

The backlight module provided in embodiment 1 of the present invention is to reduce a deformation space between the first prism film 31 (i.e., the upper prism) and the lower polarizer due to a GAP (GAP), so as to effectively reduce a risk of newton ring.

It should be noted that the backlight module is specifically a side-in type backlight module, and one side surface of the light guide plate 10 is a light incident surface. The light bar 40 is generally composed of a wiring board 41 (e.g., FPC) and a light emitting portion (e.g., LED chip) 42, and light emitted from the light emitting portion 42 is incident on the light incident surface 11 of the light guide plate 10.

The first prism film 31 is an upper prism film generally known to those skilled in the art, and the first body portion 310 is a body portion located in the VA region of the backlight assembly, and the first lug 311 extends from the first body portion 310 in the film direction.

The second prism film 32 is a lower prism film generally known to those skilled in the art, and the second body portion 320 is a body portion located in the VA region of the backlight assembly, and the second protrusion 321 extends from the second body portion 320 in the film direction.

The frame may be a rubber frame or an integrated rubber frame formed by connecting a rubber frame and an outer frame (usually an iron frame).

Except for the side wall 60 near one side of the light bar 40 (hereinafter, referred to as the light bar side), the top ends of the other three side walls 60 are lower than the top end of the prism in the first body portion 310 by a height difference smaller than the thickness of the light-shielding tape 50, that is, the bezel in the prior art is sunk. Meanwhile, the light-shielding tape in the prior art is narrowed in the VA region, so that the light-shielding tape 50 is not in contact with the first main body part 310, and the height difference between the upper surface of the light-shielding tape 50 after sinking and the top end of the prism of the first prism film 31 is reduced, that is, the deformation space generated by the large GAP (GAP) between the first prism film 31 and the lower polarizer after the backlight module is attached to the liquid crystal display panel is reduced.

Here, the frame generally includes four sidewalls 60 connected in series. In order to ensure that the adhesion force of the backlight module and the display panel is sufficient and prevent the display panel from being separated, the four sidewalls 60 are all provided with the light-shielding tapes 50, i.e. formed into a ring shape.

Since the light-shielding tape is narrowed in the VA region, in order to prevent the first prism film 31 from being unfixed around and causing defects such as film movement, scratches, and foreign matters, and also considering the individual test requirements of the attached display device and the dropping situation of the client display device, the first prism film 31 and the light-shielding tape 50 need to be fixed by means of adhesion.

In order to fix the first prism film 31, in the backlight module provided in embodiment 1 of the present invention, the first protruding lug 311 extending from the first prism film 31 is fixed on the side of the lamp strip with a larger area, and in order to allow the first lug 311 to sink down with respect to the first body part 310 of the first prism film 31, the diffusion film 20 is modified on the light bar side so that the diffusion film 20 is not arranged below the first lug 311 and the second lug 321, and the absolute value of the difference in thickness between the light-shielding tape 50 and the diffusion film 20 is controlled to be smaller than the thickness of the light-shielding tape 50, since the diffusion film 20 is not present in the region where the first lug 311 overlaps the second lug 321, so that the first lug 311 on the side of the light bar can be sunk after being lapped on the second lug 321 and can contact the part of the shading adhesive tape 50 on the side of the light bar, so that the first prism film 31 is fixed under the light shielding tape 50 by the first protrusion 311 sinking.

When the height difference between the top ends of the remaining three side walls 60, excluding the side walls 60 on the light bar side, and the prism top end in the first main body portion 310 is equal to or approximately equal to the thickness of the light shielding tape 50, and the thickness difference between the light shielding tape 50 and the diffusion film 20 is zero or approximately zero (i.e. the thicknesses of the two are equal to or approximately equal to each other), the first main body portion 310 of the first prism film 31 and the surface of the light shielding tape 50 adhered to the top ends of the remaining side walls 60 can be made flush or approximately flush, and simultaneously the first main body portion 310 of the first prism film 31 and the part of the light shielding tape 50 adhered to the first lug 311 on the light bar side can also be made flush or approximately flush, so that after the backlight module is adhered to the display panel, a small Air Gap (Air Gap) of 0-0.02 mm between the first prism film 31 (i.e. the upper prism film) and the lower polarizer of the display panel can be achieved, meanwhile, the periphery of the VA area can be kept to be adhered with a shading tape and a lower polarizer of the display panel.

Based on this, through the backlight module provided in embodiment 1 of the present invention, the frame is sunk and the light-shielding tape is narrowed to prevent the light-shielding tape from contacting the top end of the prism of the first prism film, and the diffusion film is improved on the side of the light bar, so that the gap between the first prism film and the lower polarizer of the display panel can be reduced, and even the gap between the first prism film and the lower polarizer of the display panel can be removed, so that the first prism film is directly contacted with the lower polarizer of the display panel, and at least the first prism film can be fixed, and the fixed second prism film below the first prism film is pressed by the fixed first prism film, so that the backlight module and the display panel are fixed in a sticking manner, thereby reducing or even eliminating the display defects of the display device caused by the deformation of the prism in the backlight module.

Further, in order to improve the firmness of fixing each film material in the backlight module, the second lug 32 extending from the side of the light bar of the second prism film 32 is also fixed, and the specific structure is as follows:

referring to fig. 1, the backlight module further includes: a light bar adhesive 70 for adhering the light bar 40 to the edge of the light emitting surface 12 of the light guide plate 10; a light bar adhesive extension part 71 which is not covered by the light bar 40 extends on the light bar adhesive 70; on the side close to the light bar, the length of the second lug 321 in the extending direction is greater than the length of the first lug 311 in the extending direction, and the partial region of the second lug 321 in the extending direction, which is not covered by the first lug 311, is adhered to the light bar adhesive extending portion 70.

Here, the widths of the first lug 311 and the second lug 321 should not be too large, and on the lamp side, the first lug 311 and the second lug 321 are on both sides as far as possible, i.e., far from the display area, to prevent the lugs from bending to cause prism deformation.

Taking the backlight module applied to the small-sized hand-held terminal LCD as an example, considering the size and the process tolerance, the widths of the first lug 311 and the second lug 321 are preferably 1-2 mm; the second protruding lug 321 is overlapped with the light bar glue and the shading glue, and a certain gap (for example, 0.2-0.25 mm) is reserved to prevent the overlapping interference of the film material structures after assembly.

Further, as shown in fig. 6, the backlight module further includes: and the shading block 80 is arranged on the diffusion film 20 and is positioned between the first body part 310, the second body part 320 and the light bar 40.

The light shielding block 80 (also referred to as a diffusion black stripe) may press the diffusion film 20 and shield the strong light leaking from the light incident surface 11 of the light guide plate 10.

Since the light shielding block 80 is disposed between the first body portion 310, the second body portion 320 and the light bar 40, the first lug 311 extending from the first body portion 310 and the second lug 321 extending from the second body portion 320 are not visible in the cross-sectional structure of fig. 6.

In the backlight module provided in embodiment 1 of the present invention, the frame may be a glue frame, that is, as shown in fig. 1, the frame includes: an outer frame (e.g., an iron frame) and a rubber frame located between the outer frame and the light guide plate 10; wherein, the frame includes: four first sub-sidewalls 61; the frame of gluing includes: at least two second opposing sub-sidewalls 62; at least the side walls 60 on both the side adjacent to the light bar and the side opposite the light bar include: a first sub-sidewall 61 and a second sub-sidewall 62; the upper surface of the light shielding block 80 away from the diffusion film 20 is flush with the top end of the second sub-sidewall 62 (i.e., the sidewall of the rubber frame) in the sidewall 60 near the light bar side, so that the portion of the light shielding tape 50 on the light bar side can be stuck on the light shielding block 80.

Or, the frame in the backlight module may also be a separate plastic frame in a conventional module, and the upper surface of the light shielding block away from the diffusion film is flush with the top end of the side wall close to the lamp strip side.

Further, referring to fig. 1, the backlight module may further include: a reflective sheet 90 positioned under the light guide plate 10.

As shown in fig. 7, the assembly process of the backlight module at the light bar side is as follows:

(1) assembling a reflector plate: for the glue frame and the iron frame which are integrally formed, the reflective sheet is firstly assembled on the back plate, and for the sake of simplicity, the reflective sheet and the back plate are not shown in fig. 7.

(2) Assembling the light guide plate 10 and the light bar 40: the light bar 40 and the light guide plate 10 are assembled into a whole through the light bar glue 70. Wherein, light bar glue extension parts 71 (namely ears) which are not covered by the light bars 40 are designed to extend from two sides of the light bar glue 70; the length of the circuit board extending out of the light bar 40 by the light bar glue extension part 71 is about 0.6 mm-0.8 mm, and the width is about 1 mm.

(3) Assembling the light guide plate 10 and the light bar 40 on the reflector plate: that is, the bottom surface of the light guide plate 10 is covered on the reflective sheet.

(4) Assembling the diffusion film 20 and the light shielding block 80: the diffusion film 20 is assembled on the light guide plate 10, and grooves are formed on both sides of the diffusion film 20 to realize sinking and fixing of the corresponding lugs on the first prism film and the second prism film. A light shielding block 80 is assembled on the diffusion film 20, and the light shielding block 80 is located between the first main body portion of the first prism film, the second main body portion of the second prism film, and the light bar 40 to be assembled. And cutting and removing two sides of the shading block 80, wherein the width of the shading block is 0.15-0.2 mm wider than the corresponding lug on the first prism film and the second prism film to be assembled. The distance between the transverse top of the shading block 80 and the light bar 40 is 0.2-0.25 mm, and the distance between the longitudinal direction of the shading block and the light bar glue extension part 71 is 0.15-0.2 mm, so that thickness interference after assembly is prevented;

(5) assembling second prism film 32: the second lug 321 of the second prism film 32 is larger than the first lug of the first prism film to be assembled, and the second lug 321 is lapped with the light bar adhesive extension part 71 by 0.3-0.5 mm to ensure the firmness of adhesion;

(6) assembling first prism film 31: the first lug 311 of the first prism film 31 is shorter than the second lug 321, and is located on the second lug 321 and is about 0.3mm away from the left edge of the light bar glue body part;

(7) assembling the light-shielding tape 50: on the light bar side, the light shielding tape 50 is retracted to the left edge of the light shielding block 80 and is not adhered to the prism top in the first main body portion of the first prism film 31, and the lower side of the light shielding tape 50 is adhered to the light shielding block 80.

Finally, a protective film may be attached to the light-shielding tape 50 to prevent the first prism film on the outermost side from running out of the frame and to prevent foreign matter from entering, so that the package is shipped to a module factory and attached to the display panel.

In FIG. 7, the sectional structure of the backlight module along the A-A 'direction is as shown in FIG. 1, and the sectional structure along the B-B' direction is as shown in FIG. 6.

Here, as shown in part (a) of fig. 8, the second protrusion 321 may be rectangular, and accordingly, the opening of the diffusion membrane 20 at the region not overlapping with the second protrusion 321 is also rectangular.

Preferably, as shown in part (b) of fig. 8, in order to prevent light leakage from the light guide plate in the region near the lamp strip, the second protrusion 321 may be designed to be trapezoidal, and accordingly, the opening of the diffusion film 20 in the region not overlapping with the second protrusion 321 is designed to be inverted trapezoidal.

The frame in the backlight module is a structure in which the rubber frame and the iron frame are integrated, embodiment 1 of the present invention is not limited thereto, and may also be applied to a conventional rubber frame backlight module, and the cross-sectional structures of the three sides (i.e., the top side, the left side, and the right side) except the light bar side are as shown in fig. 9, that is, in the backlight module, the frame around the light guide plate 10 is the rubber frame, and the fixing manner of the first prism film and the second prism film on the light bar side is as shown in fig. 1, which is not described herein again.

On the basis, in order to improve the fixing firmness of the first prism film and the second prism film, lugs can be further fixed on the three sides (namely the top side, the left side and the right side) except the light bar side, and the specific structure is as follows:

the first lug 311 is also located on a side of the first body portion 310 adjacent to at least one of the remaining three side walls 60, and/or the second lug 321 is also located on a side of the second body portion 32 adjacent to at least one of the remaining three side walls 60; at least one side wall 60 of the remaining three side walls 60 is provided with a groove 60a, the groove 60a being adapted to receive the first lug 311 and/or the second lug 321 adjacent thereto; the light shielding tape 50 is further stuck to the top end of the side wall 60 provided with the groove 60a and at least one of the first lug 311 and the second lug 321 located in the groove 60 a.

Except for the side close to the light bar, in the case that the first lug 311 and the second lug 321 are both located on the same side of the light guide plate 10, the first lug 311 and the second lug 321 are disposed in a staggered manner, or the first lug 311 is located on the second lug 321, and the length of the second lug 321 in the extending direction is greater than that of the first lug 311.

As shown in part (a) of fig. 10, since the top ends of the three remaining side walls 60 are lower than the top ends of the prisms in the first main body portion of the first prism film except for the side wall 60 close to the light bar side, and the height difference is smaller than the thickness of the light-shielding tape 50, that is, the top ends of the three remaining side walls 60 are all sunk, when only the first protruding lug 311 extends out from one side of the light guide plate 10 except the light bar side, the groove 60a provides a sunk and fixed space for the first protruding lug 311, and the groove depth can be designed according to the thickness of the film material, that is, the same as the thickness of the first prism film.

Similarly, as shown in fig. 10 (b), when the light guide plate 10 has only the second protrusion 321 extending from one side of the light guide plate except the light bar side, the groove 60a provides a sinking and fixing space for the second protrusion 321, and the groove depth can be designed according to the film thickness, i.e. the same as the thickness of the second prism film.

That is, when the first prism film and the second prism film have corresponding lugs extending therefrom, and the first lug 311 and the second lug 321 extend toward different sidewalls 60, respectively, the first lug 311 and the second lug 321 are located in the grooves 60a of different sidewalls 60.

Alternatively, the first prism film and the second prism film may have corresponding lugs extending therefrom, and the groove 60a extending to the same sidewall 60, i.e. the same sidewall 60, may receive the first lug 311 and the second lug 321.

Here, in order to make the light shielding tape 50 disposed on the side wall 60 adhere to the first and

second lugs

311 and 321 in the groove 60a, in the case where the first and

second lugs

311 and 321 are both located on the same side of the light guide plate 10, as shown in parts (c) and (d) of fig. 10, the first and

second lugs

311 and 321 are disposed alternately.

Alternatively, as shown in fig. 10 (e), the first lug 311 may be disposed on the second lug 321, and the length of the second lug 321 in the extending direction is greater than the length of the first lug 311 in the extending direction, that is, the second lug 321 is exposed to be adhered to the light-shielding tape 50 above.

It should be noted that, referring to parts (a), (b) and (e) in fig. 10, when the frame includes an outer frame (e.g., an iron frame) and a rubber frame, the groove 60a may be formed by a portion of the second sub-sidewall 62 of the rubber frame lower than the first sub-sidewall 61 of the outer frame; alternatively, referring to fig. 10 (c), when the frame includes an outer frame (e.g., an iron frame) and a rubber frame, the groove 60a may be formed on the second sub-sidewall 62 of the inner rubber frame.

For the conventional backlight module, the frame is only a rubber frame, and the groove is a concave portion at the top end of the sidewall as shown in part (c) of fig. 10.

Here, a certain gap should be reserved between the top end of the first lug 311 in the extending direction and the groove 60a accommodating the first lug 311 to prevent assembly interference; and/or, a certain clearance should be reserved between the top end of the second lug 321 in the extending direction and the groove 60a for accommodating the second lug 321 to prevent assembly interference.

Further, for one side of the first body portion from which the first lug 311 extends, the first lug 311 is distributed at both end edges of the one side; and/or, for the side of the second body portion from which the second lug 321 extends, the second lug 321 is distributed at both end edges of the side. Namely, the ears extending out of the first prism film and/or the second prism film should be far away from the display area, so as to prevent the lugs from bending to cause prism deformation.

Example 2

As shown in fig. 11, embodiment 2 of the present invention provides another backlight module, including: a frame, a light guide plate 10, a diffusion film 20, a second prism film 32 (not marked in fig. 11), a first prism film 31, a light bar 40 on the light incident surface 11 side of the light guide plate 10, and a light blocking tape 50 on the frame in sequence; wherein the first prism film 31 includes: a first body portion 310 and a first lug 311 extending therefrom; the region where the diffusion film does not overlap with the 20 first lugs 311; the frame includes: four side walls 60; except for the side wall 60 close to the light bar side, the top ends of the other three side walls 60 are lower than the top end of the prism in the first main body part 310, and the height difference of the lower parts is smaller than the thickness of the shading tape 50; the top end of at least one side wall 60 of the other three side walls 60 is provided with a groove 60a, and the groove 60a is used for accommodating the adjacent first lug 311; the light shielding tape 50 is not in contact with the first body portion 310; the light-shielding tape 50 is adhered to at least the side wall 60 near the light bar side, the light bar 40, the top end of the side wall 60 provided with the groove 60a, and the first lug 311 positioned in the groove 60 a.

In addition, compared to the side-in backlight module provided in embodiment 1, the side-in backlight module provided in embodiment 2 selects the fixing manner of the first prism film 31 on at least one of the three sidewalls 60 except for the light bar side. That is, the frame is sunk, the light shielding tape 50 is narrowed not to contact the prism tips in the first body part 310 of the first prism film 31, and the light shielding tape 50 is stuck to the first lugs 311 in the groove 60a to fix the first prism film 31.

To further firmly fix the second prism film 32 under the first prism film 31, the second prism film 32 includes: a second body portion 320 and a second lug 321 extending therefrom; the region where the diffusion membrane 20 does not overlap with the second tab 321; the groove 60a also serves to receive an adjacent second lug 321.

Here, referring to the illustration of the part (a) and the part (b) in fig. 10 of the foregoing embodiment 1, for the case where the first lug 311 and the second lug 321 are located on different sides of the light guide plate 10, the first lug 311 and the second lug 321 are respectively received in the grooves 60a of different side walls 60.

Referring to the parts (c), (d), and (e) in fig. 10 of the foregoing embodiment 1, for the case where the first lug 311 and the second lug 321 are located on the same side of the light guide plate 10, the first lug 311 and the second lug 321 are accommodated in the groove 60a of the same side wall 60; the first lugs 311 and the second lugs 321 are disposed in a staggered manner, or the first lugs 311 are disposed on the second lugs 321, and the length of the second lugs 321 in the extending direction is greater than the length of the first lugs 311 in the extending direction.

In the above embodiment 2, the outer frame may be constituted by only the rubber frame, or the outer frame may be constituted by an outer frame (for example, an iron frame) and a rubber frame, that is, a rubber frame. The opening manner of the groove 60a on the side wall of the outer frame and the specific arrangement manner of each lug can refer to the foregoing embodiment 1, and are not described herein again.

Example 3

Embodiment 3 of the present invention further provides a backlight module, as shown in part (a) of fig. 10 in reference to the foregoing embodiments, the backlight module including: a frame, a diffusion plate 10, a diffusion film 20, a second prism film 32 and a first prism film 31 which are sequentially positioned on the diffusion plate 10, and a light-shielding tape 50 positioned on the frame; wherein the first prism film 31 includes: a first body portion 310 and a first lug 311 extending therefrom; the region where the diffusion film 20 does not overlap with the first tab 311; the frame includes: four side walls 60 (only one side wall 60 is shown in the figure); the top end of the side wall 60 is lower than the prism top end in the first body portion 310 by a height difference smaller than the thickness of the light shielding tape 50; the top end of at least one side wall 60 is provided with a groove 60a, the groove 60 is used for accommodating the adjacent first lug 311; the light shielding tape 50 is not in contact with the first body portion 310; the light shielding tape 50 is adhered to at least the top end of the side wall 60 provided with the groove 60a and the first lug 311 positioned in the groove 60 a.

In the direct type backlight module of embodiment 3, compared with the side type backlight modules of

embodiments

1 and 2, the fixing manner of the first prism film 31 is selected to be at least one of the four sidewalls 60. That is, the frame is sunk, the light shielding tape 50 is narrowed not to contact the prism tips in the first body part 310 of the first prism film 31, and the light shielding tape 50 is stuck to the first lugs 311 in the groove 60a to fix the first prism film 31.

In the above embodiment 3, the outer frame may be constituted by only the rubber frame, or the outer frame may be constituted by an outer frame (for example, an iron frame) and a rubber frame, that is, a rubber frame. The opening manner of the groove 60a on the side wall of the outer frame and the specific arrangement manner of each lug can refer to the foregoing embodiment 1, and are not described herein again.

After the backlight module provided by embodiments 1 to 3 of the present invention is attached to the display panel, the gap between the first prism film and the lower polarizer of the display panel is removed, and the light-shielding adhesive tape can fix the first lug extending from the first prism film, so that the film material in the backlight module can be fixed, and the shaking is avoided, so as to meet the testing requirements of the single body and the whole structure of the backlight module; moreover, the backlight module can be packaged and shipped in a single form, and is assembled with the display panel in a display module factory to maintain the division of industrial chains. The main part of the shading adhesive tape is still arranged on the frame, so that the adhesion force of the assembled backlight module and the display panel is sufficient, the display panel is prevented from being separated, and meanwhile, the backlight module cannot generate larger light leakage; and considering the deformation and shrinkage of the film material, lugs on each prism film are arranged at two ends of one side of each main body part far away from the display area, so that the requirements of single body and whole machine environment reliability are met.

Example 4

Embodiment 4 of the present invention further provides a display device, including a liquid crystal display panel; the liquid crystal display panel includes: a first polarizer (i.e., commonly referred to as an upper polarizer) located at a display side and a second polarizer (i.e., commonly referred to as a lower polarizer) located away from the display side; and the backlight module provided in the above embodiments 1 to 3; wherein, the shading adhesive tape in the backlight module is also adhered to the second polarizer.

The display device can be a product or a component with any display function, such as a liquid crystal display, a liquid crystal television, a digital photo frame, a mobile phone, a tablet personal computer, a navigator and the like.

To prevent light leakage around the VA region of the backlight module, the BM (black matrix) of the display panel needs to completely cover the light-shielding region of the backlight module.

For example, here, a side-in type backlight module in the prior art and the backlight module provided in the foregoing embodiment 1 are taken as examples, fig. 12 is a schematic view of an overall structure of a display device after a display panel and the backlight module are bonded in the prior art, and fig. 13 is a schematic view of a structure after the backlight module and the display panel are bonded in the embodiment 1 of the present invention.

In fig. 12 and 13 described above, the display panel 02 generally includes: the liquid crystal display panel comprises a color film substrate 100 and an array substrate 101 which are paired, a liquid crystal layer (not shown in fig. 12 and 13 due to the small thickness) encapsulated between the color film substrate 100 and the array substrate 101, an upper polarizer 103 attached to the surface of one side of the color film substrate 100 away from the array substrate 101, a lower polarizer 104 attached to the surface of one side of the array substrate 101 away from the color film substrate 100, and a control circuit 105 arranged on the array substrate 101 and located outside the color film substrate 100. The specific structure can be adopted in the prior art, and details of embodiment 3 of the present invention are not described herein.

In fig. 12, a gap having a thickness of the light shielding tape 50 is formed between the lower polarizer 104 and the upper prism film 31; in contrast, in the backlight module 01 provided in embodiments 1 to 3 of the present invention, the side walls 60 of the borders on the opposite side and the left and right sides of the light bar are sunk, and the light-shielding tape 50 is narrowed at the periphery of the VA region and is not in contact with the top ends of the prisms of the first prism film 31 (i.e., the upper prism film), but is adhered to the first protruding lugs 311 extending from the first prism film 31.

Thus, after the backlight module provided in embodiments 1 to 3 is attached to the display panel, the gap between the first prism film and the lower polarizer of the display panel can be reduced, and even the gap between the first prism film and the lower polarizer of the display panel can be removed, so that the first prism film is in direct contact with the lower polarizer of the display panel, and therefore poor display of the display device caused by prism deformation in the backlight module can be reduced or even further eliminated.

Further, when the design requirements of the left and right side module frames of the handheld terminal display device are small, and the minimum width that can be cut by the light-shielding tape is difficult to meet the design requirements of the left and right side frames of the display device module, as shown in fig. 14, the side walls of the rubber frame in the outer frame on the left and right sides in the backlight module 01 can be removed, and only the outer frame (e.g., an iron frame) is used as the frame, that is, only the first side wall 61 of the outer frame is on the left and right sides of the light guide plate 10; after the backlight module 01 is attached to the display panel 02, the display panel is bonded to an outer frame (e.g., an iron frame) of the backlight module by using a side coating adhesive material 106 (e.g., a hot melt adhesive or a UV optical adhesive). The upper and lower sides of the display device have smaller requirements on the design of the module frame, and a structure with larger light shielding and bonding can be adopted, and specific structures can refer to the specific descriptions of embodiments 1 to 3, and are not described herein again.

The left side and the right side refer to two opposite sides which are perpendicular to a connecting line of two eyes of a viewer in four sides of the display device; the upper and lower sides refer to two opposite sides among the four sides of the display device, which are parallel to a line connecting both eyes of the viewer.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A backlight module, comprising: the light guide plate comprises a frame, a light guide plate, a diffusion film, a second prism film, a first prism film, a light bar and a shading adhesive tape, wherein the diffusion film, the second prism film and the first prism film are sequentially arranged on the light guide plate; wherein,

the first prism film includes: a first body portion and a first lug extending therefrom; the first lug is at least positioned on one side of the first body part close to the light bar; the second prism film includes: a second body portion and a second lug extending therefrom; the second lug is at least positioned on one side of the second body part close to the light bar;

the diffusion membrane is not overlapped with the first lug and the second lug; on one side close to the light bar, the first lug is positioned above the second lug;

the frame includes: four side walls; the top ends of the other three side walls except the side wall close to one side of the light bar are lower than the top end of the prism in the first main body part, and the height difference of the top ends is smaller than the thickness of the shading adhesive tape;

the light-shielding tape is not in contact with the first body portion; the shading adhesive tape is at least stuck on the side wall close to one side of the light bar, the light bar and the first lug, and the absolute value of the thickness difference between the shading adhesive tape and the diffusion film is smaller than the thickness of the shading adhesive tape.

2. A backlight module according to claim 1, further comprising:

the light bar glue is used for sticking the light bar on the edge of the light-emitting surface of the light guide plate; the light bar glue extends to form a light bar glue extending part which is not covered by the light bar;

on one side close to the light bar, the length of the second lug in the extending direction is larger than that of the first lug in the extending direction, and a partial area, which is not covered by the first lug, of the second lug in the extending direction is adhered to the light bar glue extending part.

3. A backlight module according to claim 1, further comprising:

the light shading block is arranged on the diffusion film and positioned among the first main body part, the second main body part and the light bar;

the frame includes: the outer frame and the rubber frame are positioned between the outer frame and the light guide plate; the outer frame includes: four first sub-sidewalls; the frame of gluing includes: at least two second opposite sub-sidewalls; at least the side wall near one side of the light bar and near the opposite side of the light bar comprise: the first sub-sidewall and the second sub-sidewall;

the upper surface of the shading block, which is far away from the diffusion film, is flush with the top end of the second sub-side wall in the side wall close to one side of the light bar;

or,

the frame is a rubber frame;

the upper surface of the shading block, which is far away from the diffusion film, is flush with the top end of the side wall, which is close to one side of the light bar.

4. The backlight module according to claim 1,

the first lug is also located on a side of the first body portion adjacent to at least one of the remaining three side walls, and/or the second lug is also located on a side of the second body portion adjacent to at least one of the remaining three side walls;

the top end of at least one of the other three side walls is provided with a groove which is used for accommodating the adjacent first lug and/or the second lug;

the shading adhesive tape is further pasted on the top end of the side wall provided with the groove and at least one of the first lug and the second lug in the groove;

except for the side close to the light bar, for the condition that the first lug and the second lug are both positioned on the same side of the light guide plate, the first lug and the second lug are arranged in a staggered mode, or the first lug is positioned on the second lug, and the length of the second lug in the extending direction is larger than that of the first lug in the extending direction.

5. A backlight module, comprising: the light guide plate comprises a frame, a light guide plate, a diffusion film, a second prism film, a first prism film, a light bar and a shading adhesive tape, wherein the diffusion film, the second prism film and the first prism film are sequentially arranged on the light guide plate; wherein,

the first prism film includes: a first body portion and a first lug extending therefrom; a region where the diffusion membrane does not overlap the first tab;

the top end of at least one of the other three side walls is provided with a groove, and the groove is used for accommodating the adjacent first lug;

the light-shielding tape is not in contact with the first body portion; the shading adhesive tape is at least adhered to the side wall close to one side of the light bar, the top end of the side wall provided with the groove and the first lug positioned in the groove;

the second prism film includes: a second body portion and a second lug extending therefrom; a region where the diffusion membrane does not overlap the second tab; the groove is also used for accommodating the second lug which is close to the groove;

for the case that the first lug and the second lug are positioned on the same side of the light guide plate, the first lug and the second lug are accommodated in the groove of the same side wall; wherein the first lug and the second lug are arranged in a staggered manner.

6. A backlight module, comprising: the light shading adhesive tape comprises a frame, a diffusion plate, a diffusion film, a second prism film, a first prism film and a light shading adhesive tape, wherein the diffusion film, the second prism film and the first prism film are sequentially arranged on the diffusion plate; wherein,

the frame includes: four side walls; the top end of the side wall is lower than the top end of the prism in the first main body part, and the lower height difference is smaller than the thickness of the shading adhesive tape;

the top end of at least one side wall is provided with a groove which is used for accommodating the adjacent first lug;

the light-shielding tape is not in contact with the first body portion; the shading adhesive tape is at least adhered to the top end of the side wall provided with the groove and the first lug positioned in the groove;

for the case where the first lug and the second lug are located on the same side of the diffuser plate, the first lug and the second lug are received in the groove of the same sidewall; wherein the first lug and the second lug are arranged in a staggered manner.

7. A display device includes a liquid crystal display panel; the liquid crystal display panel includes: the display panel comprises a first polarizer positioned on a display side and a second polarizer far away from the display side; characterized in that, the display device further comprises: a backlight module according to any one of claims 1 to 6;

the shading adhesive tape in the backlight module is also adhered to the second polarizer.