CN210488192U - Diffusion film with light absorption microstructure and backlight module - Google Patents

Abstract

The utility model discloses a diffusion barrier and backlight unit of area extinction micro-structure, include: the diffusion film comprises a diffusion film body, a first black shading layer arranged on a light-emitting surface of a lamp source of the diffusion film body, a second black shading layer arranged on a light-entering surface of the lamp source of the diffusion film body, and a microstructure area arranged at the tail part of the second black shading layer and corresponding to the light-entering surface of the lamp source of the diffusion film body, wherein a plurality of light absorption microstructures are arranged in the microstructure area and correspond to the position of a lamp holder, each light absorption microstructure comprises a plurality of microstructure units, and the distribution density of the microstructure units is gradually reduced from the center point of the lamp holder to the two sides of a display area. The utility model discloses diffusion barrier lamp socket department sets up black light shield layer cooperation extinction micro-structure, and black light shield layer can absorb lamp socket department light, and phenomenons such as lamp socket facula, lantern eye are eliminated to the light of extinction micro-structure dispersible reflection lamp socket, improve visual effect, guarantee the module roughness, make the luminance of lamp house, lamp socket even, are particularly useful for narrow frame backlight unit.

Description

Diffusion film with light absorption microstructure and backlight module

Technical Field

The utility model relates to a liquid crystal display field especially relates to a diffusion barrier and backlight unit of area extinction micro-structure.

Background

The existing backlight generally adopts a plurality of LED lamps to emit light, the light is emitted into the light guide plate from the side surface, and the light is diffused through the light guide plate and the diffusion film and the reflection film on the back surface of the light guide plate, so that the light is emitted from the front surface of the light guide plate, and the backlight effect is achieved. However, at the position close to the LED lamp, because light is concentrated and brightness is high, the brightness of one side of the display screen close to the LED lamp is high, light spots are generated, the display effect is seriously affected sometimes, and therefore the use experience of the backlight display screen is reduced.

Most of the measures for solving the light spots of the lamp socket in the existing backlight module are to brush ink, paste shading glue and the like at the position of the FPC lamp socket or at one end of the light source side of the diffusion film, but the effect of the measures is not obvious, and particularly in the backlight module with a narrow frame, the light spots and the light eyes at the boundary of a display area and a non-display area are still serious. Some backlight modules are provided with sawtooth structures at the lamp sockets of the light guide plate, but the forming process is complex, and the sawtooth structures are easy to break. Therefore, the lamp socket light spot is still a problem to be solved urgently.

Accordingly, the prior art is deficient and needs improvement.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough of prior art, provide a diffusion barrier of area extinction micro-structure.

The technical scheme of the utility model as follows: providing a diffusion film with light absorbing microstructures, comprising: the diffusion film comprises a diffusion film body, a first black shading layer arranged on a light outlet surface of a light source of the diffusion film body, a second black shading layer arranged on a light inlet surface of the light source of the diffusion film body, and a gradual change microstructure area arranged on the tail portion of the second black shading layer corresponding to the light inlet surface of the light source of the diffusion film body, wherein a plurality of light absorption microstructures are arranged in the microstructure area, the light absorption microstructures are arranged corresponding to the positions of lamp sockets, each light absorption microstructure comprises a plurality of microstructure units, and the distribution density of the microstructure units is gradually reduced from the central point of the position of the lamp socket to the display area and two sides of a lamp.

Further, the second black shading layer is of a concave-convex structure, the concave-convex structure comprises convex parts and concave parts which are continuously arranged, the convex parts correspond to the positions of the lamp sockets, and the concave parts correspond to the positions between the lamps.

Further, the concave-convex structure is wavy or in a great wall shape.

Further, the second black shading layer is a black ink layer.

Further, the light absorbing microstructures are partially overlapped with the tail portion of the second black light shielding layer and extend to the display area.

Further, the light absorption microstructures are ink layers printed on the light incidence surface of the diffusion film body in a silk-screen mode, and the color of the ink layers is white or gray.

Further, the light absorption microstructure is in any one shape of a semicircle, a semiellipse, a triangle and a trapezoid, the microstructure unit is in any one shape of a lattice point, a transverse bar and a vertical bar, and the thickness of the microstructure unit is 0.01-0.15 mm.

Furthermore, a black-and-white double-sided adhesive tape is arranged at the lamp source of the diffusion film body corresponding to the head of the second black shading layer, the white surface of the black-and-white double-sided adhesive tape faces outwards, and the black-and-white double-sided adhesive tape is not overlapped with the microstructure area. The first black light-shielding layer partially overlaps the second black light-shielding layer.

Furthermore, a plurality of cutting lines are arranged on the black shading layer at intervals.

Shading glue is arranged on the periphery of the diffusion film body, the microstructure area exceeds the shading glue and extends to the display area, and the distance between the edge of the microstructure area close to the display area and the shading glue is 1.0mm-1.5 mm.

The utility model also provides a backlight module, include as above the diffusion barrier of area extinction micro-structure.

Adopt above-mentioned scheme, the utility model discloses diffusion barrier main part lantern light opening department sets up black light shield layer cooperation extinction micro-structure, and the black light shield layer can absorb lantern festival part light, and the extinction micro-structure of gradual change formula can disperse, reflect the light of lantern festival, avoids the position light-emitting of light never need the light-emitting, effectively eliminates phenomenons such as lantern festival facula, lantern eye, improves visual effect, can also guarantee the roughness of module simultaneously, makes between the lamp, the luminance of lantern festival is even, is particularly useful for the more and more narrow structure of backlight unit frame.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a diffusion film with a light-absorbing microstructure according to the present invention;

FIG. 2 is a schematic structural diagram of another embodiment of a light-absorbing microstructure-equipped diffusion film according to the present invention;

FIG. 3 is a schematic structural diagram of an embodiment of a diffusion film with a second black mask layer;

FIG. 4 is a schematic structural diagram of another embodiment of a diffusion film with a second black mask layer;

FIG. 5 is a schematic structural diagram of a diffusion film with a second black mask layer according to another embodiment;

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5;

fig. 7 is a schematic structural view of the backlight module of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 and 2, the present invention provides a diffusion film with a light absorbing microstructure, including: the diffusion film comprises a diffusion film body 1, a first black shading layer 2 arranged on a light-emitting surface of a light source of the diffusion film body 1, a second black shading layer 3 arranged on a light-entering surface of the light source of the diffusion film body 1, and a gradual-change microstructure area 4 arranged at the tail part of the light-entering surface of the light source of the diffusion film body 1, corresponding to the second black shading layer 3. First black light shield layer 2 is for blocking light, prevents that light from not locating the light leak from the lamp source through the membrane of adding lustre to, the interval is equipped with a plurality of cut-off lines 21 on the first black light shield layer 2, decides the black light shield layer from this cut-off line 21 to alleviate stress, avoid appearing the fold. The light absorption microstructure area 4 is provided with a plurality of light absorption microstructures 41, the light absorption microstructures 41 are arranged corresponding to the position of the lamp holder, each light absorption microstructure 41 comprises a plurality of microstructure units 411, and the distribution density of the microstructure units 411 is gradually reduced from the center point of the position of the lamp holder to the display area and two sides of the lamp. The second black light shielding layer 3 is matched with the light absorbing microstructure 41, wherein the second black light shielding layer 3 can absorb part of light of the lamp socket, specifically, in the embodiment, the first black light shielding layer 2 is partially overlapped with the second black light shielding layer 3, so that light can be effectively prevented from being emitted from a position where the light does not need to be emitted. The bright light gradually weakens from the central point of the corresponding position of the lamp socket to the display area and the two sides of the lamp, and the distribution density of the microstructure units 411 is set according to the intensity of the light, so that the brightness of the lamp socket is reduced and is uniform. Shading glue 6 is arranged on the periphery of the diffusion film body 1, the microstructure area 4 exceeds the shading glue 6 and extends to the display area, the distance between the edge of the side, close to the display area, of the microstructure area 4 and the shading glue 6 is 1.0-1.5mm, a bright area can be generated due to the position of a lamp holder and is usually shown in the position, 1.0-1.5mm, of the shading glue towards the display area, the microstructure area covers the position, and therefore the phenomena of light spots, lamp eyes and the like of the lamp holder are effectively eliminated.

Referring to fig. 1 to 5, the second black light-shielding layer 3 is a concave-convex structure, which may be a common flat structure, and the concave-convex structure can better process light. The concave-convex structure comprises a convex part 31 and a concave part 32 which are continuously arranged, wherein the convex part 31 corresponds to the position of a lamp holder, and the concave part 32 corresponds to the position between lamps. Specifically, in this embodiment, the concave-convex structure may be a wave shape or a great wall shape, or other concave-convex-like structures. The second black shading layer 3 is a black ink layer, the black ink layer is arranged on the light incoming surface of the diffusion film body 1, partial light of the lamp socket can be absorbed, the light absorbing microstructures 41 can disperse the light of the lamp socket in a gradual changing mode, and light is prevented from being emitted from positions where light is not required. The light absorption microstructures 41 are partially overlapped with the tail portions of the second black light shielding layers 3 and extend to the display area, specifically, in the embodiment, the portions, with high density, of the microstructure units 411 in the light absorption microstructures 41 are partially overlapped with the convex portions 31, the second black light shielding layers 3 are matched with the light absorption microstructures 41, the defect that light absorption is carried out only by the microstructure areas 4 can be overcome, meanwhile, the possibility of light leakage is avoided due to the fact that the light absorption is carried out in the overlapping mode, light is prevented from being emitted from positions where light is not needed, the phenomenon that light spots, lamp eyes and the like of a lamp socket are effectively eliminated is better facilitated, meanwhile, the flatness of the module can be further improved, and the brightness of the lamp room and the lamp socket is uniform.

Referring to fig. 1 and fig. 2 again, the light absorbing microstructures 41 are ink printed on the light incident surface of the diffusion film body 1 by silk screen printing, and the color of the ink is white or gray. The white ink acts to reflect light and the gray ink acts to absorb light in the appropriate amount. Transparent printing ink can not be selected for use to the printing ink, and transparent printing ink can the printing ink printing light-permeable, can't play the effect of appropriate amount shading, does not adopt black printing ink to form the dark space because of the extinction effect is too strong. Specifically, in this embodiment, the light absorbing microstructure 41 may be in any one of a semicircular shape, a semi-elliptical shape, a triangular shape, and a trapezoidal shape, or may be in other similar structures, the microstructure unit 411 may be in a dot shape, a horizontal bar shape, a vertical bar shape, or other structures, and the thickness of the microstructure unit 411 is 0.01-0.15 mm.

Referring to fig. 6, a black-and-white double-sided adhesive tape 5 is disposed at a light source of the diffusion film body 1 corresponding to the head of the second black light shielding layer 3, a white surface of the black-and-white double-sided adhesive tape 5 faces outward, the black-and-white double-sided adhesive tape 5 is not overlapped with the microstructure region 4, and the black-and-white double-sided adhesive tape 5 is added to avoid a situation that a light socket is dark due to the influence of the brightness of the LED type, so as to properly adjust the backlight brightness; the function of fixing the diffusion film on the light guide plate is played simultaneously, and especially the diffusion film is prevented from being brought up in the edge covering process of the narrow-frame backlight module.

Referring to fig. 7, the present invention further provides a backlight module including the diffusion film with a light absorbing microstructure as described above.

To sum up, the utility model discloses diffusion barrier main part lantern light opening department sets up black light shield layer cooperation extinction micro-structure, and the black light shield layer can absorb lantern festival part light, and the extinction micro-structure of gradual change formula can disperse, reflect the light of lantern festival, avoids the position light-emitting of light never need the light-emitting, effectively eliminates phenomenons such as lantern festival facula, lantern eye, improves visual effect, can also guarantee the roughness of module simultaneously, makes the luminance of lamp house, lantern festival even, is particularly useful for the more and more narrow structure of backlight unit frame.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A diffuser film with light absorbing microstructures comprising: the diffusion film comprises a diffusion film body, a first black shading layer arranged on a light outlet surface of a light source of the diffusion film body, a second black shading layer arranged on a light inlet surface of the light source of the diffusion film body, and a gradual change microstructure area arranged on the tail portion of the second black shading layer corresponding to the light inlet surface of the light source of the diffusion film body, wherein a plurality of light absorption microstructures are arranged in the microstructure area, the light absorption microstructures are arranged corresponding to the positions of lamp sockets, each light absorption microstructure comprises a plurality of microstructure units, and the distribution density of the microstructure units is gradually reduced from the central point of the position of the lamp socket to the display area and two sides of a lamp.

2. The diffusion film with a light absorbing microstructure according to claim 1, wherein the second black light shielding layer is a concave-convex structure, the concave-convex structure comprises a convex portion and a concave portion, the convex portion corresponds to a position of the base, and the concave portion corresponds to a position between lamps.

3. The diffuser film with light absorbing microstructures according to claim 2, wherein the concave-convex structure is wavy or has a great wall shape.

4. The diffuser film with light absorbing microstructures of claim 3, wherein the second black light shielding layer is a black ink layer.

5. The diffuser film with light absorbing microstructures as claimed in any one of claims 1 to 4, wherein the light absorbing microstructures are overlapped with the tail portion of the second black light shielding layer and extend to the display area.

6. The diffusion film with the light absorbing microstructures according to claim 5, wherein the light absorbing microstructures are ink layers printed on the light incident surface of the diffusion film body in a silk-screen manner, and the ink layers are white or gray in color.

7. The diffusion film with the light absorbing microstructures according to claim 6, wherein the light absorbing microstructures are in the shape of any one of a semicircle, a semiellipse, a triangle and a trapezoid, the microstructure units are in the shape of any one of a lattice point, a transverse bar and a vertical bar, and the thickness of the microstructure units is 0.01-0.15 mm.

8. The diffusion film with the light absorbing microstructure according to claim 1, wherein a black and white double-sided adhesive tape is disposed at a light source of the diffusion film body corresponding to the head of the second black light shielding layer, a white surface of the black and white double-sided adhesive tape faces outward, and the black and white double-sided adhesive tape is not overlapped with the microstructure region;

the first black light-shielding layer partially overlaps the second black light-shielding layer.

9. The diffusion film with a light absorbing microstructure according to claim 1, wherein a plurality of cut lines are arranged on the black shading layer at intervals;

shading glue is arranged on the periphery of the diffusion film body, the microstructure area exceeds the shading glue and extends to the display area, and the distance between the edge of the microstructure area close to the display area and the shading glue is 1.0mm-1.5 mm.

10. A backlight module comprising the light-absorbing microstructured diffuser film of any of claims 1-9.

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