A light-uniform film for backlight source packaging module and backlight source packaging module

Abstract

The present invention relates to the field of optical film materials, and in particular to a light-homogenizing film for a backlight source packaging module and a backlight source packaging module. The present invention provides a light-homogenizing film with good light-homogenizing effect, comprising a substrate, a plurality of micro-concave lenses are closely arranged on the first end face of the substrate, a plurality of micro-grooves are arranged at intervals on the second end face of the substrate, the concave space of each micro-groove is a congruent pyramid, the bottom face of the pyramid is a polygon, and is located on the second end face of the substrate. The pyramid is a quadrangular pyramid or a triangular pyramid. Specifically: the bottom face polygon of the micro-groove quadrangular pyramid is a parallelogram, which is arranged at intervals on the second end face, and the adjacent sides of each adjacent two parallelograms are parallel and equal; the bottom face polygon of the micro-groove triangular pyramid is a triangle, which is arranged at intervals on the second end face, and the adjacent sides of each adjacent two triangles are parallel and equal. The present invention also provides a backlight source packaging module, which has good light-homogenizing effect.

Description

Technical Field

[0001] The invention relates to the field of optical film materials, and in particular to a light-homogenizing film for a backlight source packaging module and a backlight source packaging module. Background Art

[0002] LCD display modules have a wide range of application scenarios. An existing LCD display module includes a display screen and a backlight module. The display screen itself does not emit light, and an image is formed by the light emitted by the backlight module. The backlight module is provided with a backlight panel, on which a plurality of Mini LED light sources are provided. The light emitted by each Mini LED light source is regarded as a point light source, and the light intensity of the point light source is concentrated at the center. If multiple Mini LED light sources are directly projected onto the display screen, the image formed by the display screen will be uneven in brightness, affecting the visual effect of the imaging picture. Therefore, it is usually necessary to provide a uniform light film between the multiple Mini LED light sources and the display screen to uniformly light the light of the point light source. A common uniform light film includes a substrate, and a microstructure such as a prism is provided on the first end face of the substrate. When the light passes through the first end face, it refracts, so that the light after passing through the first end face is dispersed, thereby changing from a point light source with a stronger light intensity to a mixture of a point light source with a weaker light intensity and a line light source. The light intensity distribution of the line light source is more dispersed than that of the point light source, and the visual effect of the picture formed after being projected onto the display screen is better. However, the uniform light effect of the existing uniform light films is still unsatisfactory. It is necessary to stack more uniform light films together to better uniformly distribute the point light source into a line light source. Therefore, it is necessary to reserve space for installing more uniform light films, which is not conducive to the miniaturization of LCD display modules. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a light-homogenizing film for a backlight source packaging module, which has a good light-homogenizing effect; the present invention also provides a backlight source packaging module, which has a good light-homogenizing effect.

[0004] In order to solve the above problems, the present invention provides a light-homogenizing film for a backlight source packaging module, comprising a substrate, a plurality of micro-concave lenses are closely arranged on the first end surface of the substrate, a plurality of micro-grooves are arranged at intervals on the second end surface of the substrate, and the concave space of each micro-groove is a congruent pyramid, the bottom surface of the pyramid is a polygon, and is located on the second end surface of the substrate. The pyramid is a quadrangular pyramid or a triangular pyramid. Specifically:

[0005] The bottom polygon of the micro-groove quadrangular pyramid is a parallelogram, which is arranged at intervals on the second end surface, and the adjacent sides of each two adjacent parallelograms are parallel and equal;

[0006] The bottom polygon of the micro-groove triangular pyramid is a triangle, which is arranged at intervals on the second end surface, and the adjacent sides of every two adjacent triangles are parallel and equal.

[0007] Furthermore, there is a spacing between the adjacent sides of each two adjacent polygons, and the width of the spacing is 13% to 17% of the length of the adjacent sides.

[0008] Furthermore, the spacing width is 15% of the length of the adjacent sides.

[0009] Furthermore, the bottom surface of each micro-groove quadrangular pyramid is a square or a non-square rectangle; the bottom surface of each micro-groove triangular pyramid is a regular triangle.

[0010] Further, on the first end surface, two adjacent micro-concave lenses form a partial stack, and the relationship between the micro-concave lenses conforms to the following relationship 1 and / or relationship 2 and / or relationship 3:

[0011] Relationship 1: The bottoms of the concave lenses are not all flush with each other;

[0012] Relationship 2: The notches of the micro-concave lenses are not all flush with each other;

[0013] Relationship 3: The concave depths of each micro-concave lens are not all equal.

[0014] Further, specifically, the second relationship is that the recesses of the micro-concave lenses are not all flush with each other, and not all recesses of the micro-concave lenses themselves are parallel to the first end surface or located on the first end surface.

[0015] Furthermore, in relation three, specifically, the concave depth of each micro-concave lens is 0.1 μm-5 μm.

[0016] Beneficial effect: The first end face of the light-uniform film substrate is closely arranged with a plurality of micro-concave lenses, and the second end face is alternately arranged with a plurality of micro-grooves. The light from the point light source is refracted when passing through the first end face and the second end face, so the light from the point light source is easier to be evenly distributed. The multiple micro-grooves on the second end face of the light-uniform film are alternately arranged, and two adjacent micro-grooves are spaced apart from each other. The point light source is easier to form a line light source after being refracted by the second end face. Therefore, the light-uniform film of the present invention has a better light-uniform effect.

[0017] The present invention also provides a backlight source packaging module, including a backlight lamp panel and at least two stacked homogenizing films, the first end surface of the homogenizing film serving as an incident end surface and the second end surface serving as an emitting end surface, the homogenizing films being as described above.

[0018] Furthermore, each of the light homogenizing films is identical.

[0019] Furthermore, it includes two light-enhancing prism sheets located outside the exit end face of the light-homogenizing film, and the exit end face of the light-enhancing prism sheet is arranged with multiple horizontal prisms, and the prism axes of the prisms of the same light-enhancing prism sheet are parallel to each other. The placement directions of the two light-enhancing prism sheets differ by 90°, and the angle difference value deviation range is within plus or minus 1°, plus or minus 3°, plus or minus 5°, or plus or minus 10°.

[0020] Beneficial effect: The backlight package module of the present invention includes a plurality of light-homogenizing films of the present invention, and the light-homogenizing effect of each light-homogenizing film of the present invention is better than that of the existing light-homogenizing film. Therefore, compared with the prior art, the backlight package module of the present invention can better disperse and evenly distribute the light, and the light-homogenizing effect is better. The backlight package module only needs fewer light-homogenizing films to achieve the effect of evenly distributing the point light source, so the LCD display module does not need to reserve more installation space, which is conducive to the miniaturization of the LCD display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a simulated light pattern diagram after the point light source is refracted through a uniform light film whose concave space is a quadrangular pyramid and whose spacing width is 0% (ie, no spacing).

[0022] Figure 2 It is a simulated light pattern diagram after the point light source is refracted through a uniform light film with a concave space of a quadrangular pyramid and a spacing width of 6%.

[0023] Figure 3 It is a simulated light pattern diagram after the point light source is refracted through a uniform light film with a concave space of a quadrangular pyramid and a spacing width of 15%.

[0024] Figure 4 It is a simulated light pattern diagram after the point light source is refracted through a uniform light film with a concave space of a quadrangular pyramid and a spacing width of 20%.

[0025] Figure 5 It is a simulated light pattern diagram of a point light source after being refracted by a uniform light film whose recessed space is a triangular pyramid and whose spacing width is 0% (ie, no spacing).

[0026] Figure 6 It is a simulated light pattern diagram after the point light source is refracted through a uniform light film with a concave space of a triangular pyramid and a spacing width of 6%.

[0027] Figure 7 It is a simulated light pattern diagram after the point light source is refracted by a uniform light film with a concave space of a triangular pyramid and a spacing width of 15%.

[0028] Figure 8 It is a simulated light pattern diagram after the point light source is refracted by a uniform light film with a concave space of a triangular pyramid and a spacing width of 20%.

[0029] Fig. 9It is a schematic diagram of the three-dimensional structure of the first light homogenizing film (the concave space of each micro-groove is a regular quadrangular pyramid).

[0030] Fig.10 This is a partial structural diagram (top view) of the first end surface of the first light homogenizing film under a microscope.

[0031] Fig.11 This is a simplified structural diagram of the side view of the first end surface of the first light homogenizing film (the second end surface is hidden).

[0032] Fig.12 It is a simplified structural diagram of the side view of the first end surface of the first light homogenizing film (the second end surface is hidden, and the depression depth D, the depression bottom B and the notch T are marked).

[0033] Fig.13 It is a top view of the second end surface of the first light homogenizing film.

[0034] Fig.14 yes Fig.13 A partial view of the .

[0035] Fig.15 It is a schematic diagram of the structure of a backlight source packaging module (packaged with a light-homogenizing film).

[0036] Fig.16 It is a schematic diagram of the three-dimensional structure of the second light homogenizing film (the concave space of each micro-groove is a regular triangular pyramid).

[0037] Fig.17 4 is a top view of the second end surface of the second light homogenizing film.

[0038] Fig.18 yes Fig.17 A partial view of the .

[0039] Explanation of symbols:

[0040] 11-the light-homogenizing film in which the concave space of each micro-groove is a regular tetrahedron; 12-the light-homogenizing film in which the concave space of each micro-groove is a regular triangular pyramid; 2-substrate; 21-first end face; 22-second end face; 3-micro-concave lens; 4-micro-groove; 41-concave space; 42-adjacent edge; 5-backlight packaging module; 51-Mini LED backlight board; 511-Mini LED light source; 52-quantum dot film; 53-brightness-enhancing triangular prism; 6-LCD display; D-deepness of concave; B-bottom of concave; T-notch; W-spacing width. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with specific implementation methods.

[0042] like Fig. 9 The light homogenizing film 11 shown in the figure has a plurality of micro-concave lenses 3 closely arranged on the first end surface 21 of the substrate 2. Fig.10 These micro-concave lenses 3 cover the first end surface 21 of the light homogenizing film 11, and two adjacent micro-concave lenses 3 are partially stacked, so that the duty cycle of the first end surface 21 reaches 100%. Fig.11 , the sizes of the micro-concave lenses 3 are different, see Fig.12 : The concave depths D of the micro-concave lenses 3 are not all equal, but are all in the range of 0.1μm-5μm; the concave bottoms B of the micro-concave lenses 3 are not all flush with each other; the notches T of the micro-concave lenses 3 are not all flush with each other. The notches T of some micro-concave lenses 3 are not parallel to the first end face 21, and each notch T is higher or lower than the first end face 21 or is located exactly on the first end face 21. Since the first end face 21 of the homogenizing film 11 is irregularly undulating and wavy, the haze is higher than that of the homogenizing film whose first end face is flat.

[0043] The second end surface 22 of the light homogenizing film 11 substrate 2 is Fig.13 and Fig.14 , a plurality of micro grooves 4 are arranged in an array at intervals, and the concave space 41 of each micro groove 4 is a congruent regular tetrahedron, and the bottom surface of the regular tetrahedron is a square, which is located on the second end surface 22 of the substrate 2. These bottom squares are placed in the same direction, and are arranged in an array at intervals on the second end surface 22. Every two adjacent bottom squares are adjacent to each other, and the adjacent sides 42 of the two adjacent bottom squares are equal and parallel to each other. There is a spacing between the two adjacent sides 42. The point light source is more likely to form a line light source after being refracted by the second end surface 22 with a spacing. The same point light source is used to illuminate four homogenizing films with a spacing width W of 0% (i.e., no spacing homogenizing film 11), 6%, 15%, and 20% of the length of the adjacent sides 42, and the resulting simulated light patterns are as follows: Figure 1 , 2 , 3, and 4. The simulated light pattern of the non-spacing light-homogenizing film is shown in Figure 1 , the point light source is refracted and homogenized by the non-spaced homogenizing film, and the light intensity distribution is still relatively concentrated, forming four brighter and stronger point light sources, while the line light source is weaker and less obvious, and the homogenizing effect is poor. The spacing width W of the homogenizing film is 6% of the length of the adjacent sides 42 of the two adjacent cone bottom surfaces. The simulated light pattern is shown in the figure below Figure 2 The spacing width W is 15% of the length of the adjacent edges 42 of the two adjacent cone bottom surfaces, and the simulated light type diagram is as shown Figure 3 The spacing width W is 20% of the length of the adjacent edges 42 of the two adjacent cone bottom surfaces, and the simulated light type diagram is shown Figure 4As shown. It can be seen that after the light is refracted and homogenized by these homogenizing films with spacing, a larger piece of more obvious line light source can be formed, and the light intensity distribution of the line light source is more uniform and the light intensity is stronger; the homogenizing effect of the two homogenizing films with values ​​of 15% and 20% is better than the homogenizing film with a value of 6%. According to the test, if the spacing is too narrow (for example, the spacing width W is only 6% of the length of the adjacent edge 42), the homogenizing effect of the homogenizing film is poor, and if the spacing is too wide (for example, the spacing width W is 20% of the length of the adjacent edge 42), the homogenizing effect of the homogenizing film does not improve significantly, but the duty cycle of the homogenizing film will become smaller, affecting the homogenizing effect. Therefore, when the spacing width W is within the numerical range of 13% to 17% of the length of the adjacent edge 42, the homogenizing effect of the homogenizing film is better, and the spacing width W is preferably 15%.

[0044] Not preferably, the recessed spaces 41 of the micro-grooves 4 on the second end surface 22 of the light-homogenizing film 11 can also be changed into congruent non-regular quadrangular pyramids, that is, the bottom surface of the cone is a non-square rectangle or even just a parallelogram. The light-homogenizing effect of this light-homogenizing film 11 will be slightly worse than that of the light-homogenizing film 11 with a square bottom surface, but it can still evenly distribute the point light source into a line light source.

[0045] In actual use, the light uniforming film 11 and other components need to be packaged together into a package such as Fig.15 The backlight package module 5 shown is located on the back of the LCD display screen 6. The backlight package module 5 is provided with a MiniLED backlight panel 51, a quantum dot film 52, two stacked uniform light films 11 and two stacked light-enhancing prism sheets 53 from the back to the front, wherein the front of the Mini LED backlight panel 51 is provided with a plurality of Mini LED light sources 511 aimed at the LCD display screen 6. Two identical uniform light films 11 are aligned and stacked together, both with the first end face 21 as the incident end face and the second end face 22 as the exit end face. The exit end face of the light-enhancing prism sheet 53 is arranged with a plurality of horizontally placed prisms (not shown in the figure), and the prism axes (not shown in the figure) of the same light-enhancing prism sheet 53 are parallel to each other, and the placement directions of the two light-enhancing prism sheets 53 differ by 90° (that is, the projections of the prism axes of the two light-enhancing prism sheets 53 on the exit end face are perpendicular to each other). The angle difference value may have a deviation range of plus or minus 1° (for example, an angle difference of 90° may be deviated to a range of 89° to 91°), plus or minus 3°, plus or minus 5°, or plus or minus 10°. As long as it is within this deviation range, the uniform light effect of the uniform light film 11 is better than that of the prior art.

[0046] The quantum dot film 52, two light-homogenizing films 11 and two light-enhancing prisms 53 are aligned and stacked in sequence and placed on the front of the MiniLED backlight board 51, and the quantum dot film 52, two light-homogenizing films 11 and two light-enhancing prisms 53 are packaged on the MiniLED backlight board 51 with packaging glue. After the packaging is completed, the required backlight packaging module 5 is obtained. The Mini LED light source 511 of the Mini LED backlight board 51 emits light toward the LCD display 6. Each Mini LED light source 511 can be regarded as a point light source. The point light source light first passes through the quantum dot film 52, and then the light passes through the two light-homogenizing films 11 in sequence, and is diffused and evenly spread by the two light-homogenizing films 11. The point light source is evenly spread into a line light source, and the line light source is then brightened by the two light-enhancing prisms 53 in sequence, and then projected onto the back of the LCD display 6. The LCD display 6 thus displays an image with uniform light and good visual effects. In this embodiment, the number of light-homogenizing films 11 of the backlight packaging module 5 is two. In other embodiments, the number of the light homogenizing films 11 may also be three or more.

[0047] Another light-homogenizing film 12 Fig.16 The light-homogenizing film 12 has the same structure as the light-homogenizing film 11, except that the recessed spaces 41 of the micro-grooves 4 on the first end surface 21 of the light-homogenizing film 12 are not quadrangular pyramids, but are congruent regular triangular pyramids. Fig.17 and 18 The cone bottom surface is an equilateral triangle, which is located on the first end surface 21 of the substrate 2. Each adjacent two bottom equilateral triangles of the light homogenizing film 12 are spaced apart from each other, and the adjacent sides 42 of the two adjacent sides 42 are equal and parallel to each other. There is a spacing between the two adjacent sides 42, and the spacing width W is also 13% to 17% of the length of the adjacent sides 42, preferably 15% (see Figures 5 to 8 ). Similarly, the recessed spaces 41 of each micro-groove 4 on the first end surface 21 of the light homogenizing film 12 can also be changed to be congruent non-regular triangular pyramids, that is, the bottom surface of the cone is only a general triangle that is not a regular triangle. The light homogenizing effect of this light homogenizing film will be slightly worse than that of the light homogenizing film 12 with a regular triangle bottom surface, but it can still evenly distribute the point light source into a line light source. The way in which the light homogenizing film 12 with a triangular pyramid recessed space 41 is packaged into the backlight source packaging module 5 is the same as the light homogenizing film 11 with a quadrangular pyramid recessed space 41, which will not be repeated here.

[0048] The above is only an implementation method of the invention, and does not limit the scope of patent protection. Those skilled in the art can make non-substantial changes or substitutions based on the invention, which still fall within the scope of patent protection.

Claims

1. A light-homogenizing film for a backlight package module, comprising a substrate, characterized in that: A plurality of micro-concave lenses are closely arranged on the first end surface of the substrate, and a plurality of micro-grooves are arranged at intervals on the second end surface of the substrate. The concave space of each micro-groove is a congruent pyramid. The bottom surface of the pyramid is a polygon and is located on the second end surface of the substrate. The pyramid is a quadrangular pyramid or a triangular pyramid. Specifically: The bottom polygon of the micro-groove quadrangular pyramid is a parallelogram, which is arranged at intervals on the second end surface, and the adjacent sides of each two adjacent parallelograms are parallel and equal; The bottom polygon of the micro-groove triangular pyramid is a triangle, which is arranged at intervals on the second end surface, and the adjacent sides of each two adjacent triangles are parallel and equal; There is a spacing between the adjacent sides of each two adjacent polygons, and the width of the spacing is 13% to 17% of the length of the adjacent sides.

2. The light-homogenizing film according to claim 1, wherein: The spacing width is 15% of the length of the adjacent sides.

3. The light homogenizing film according to claim 1, characterized in that: The bottom surface of each micro-groove quadrangular pyramid is a square or a non-square rectangle; the bottom surface of each micro-groove triangular pyramid is a regular triangle.

4. The light-homogenizing film according to claim 1, wherein On the first end surface, two adjacent micro-concave lenses form a partial stack, and the relationship between the micro-concave lenses conforms to the following relationship 1 and / or relationship 2 and / or relationship 3: Relationship 1: The bottoms of the concave lenses are not all flush with each other; Relationship 2: The notches of the micro-concave lenses are not all flush with each other; Relationship 3: The concave depths of each micro-concave lens are not all equal.

5. The light-homogenizing film according to claim 4, characterized in that: Specifically, the second relationship is that the recesses of the micro-concave lenses are not all flush with each other, and not all recesses of the micro-concave lenses are parallel to the first end surface or located on the first end surface.

6. The light-homogenizing film according to claim 4, characterized in that: Specifically, the concave depth of each micro-concave lens is 0.1 μm-5 μm.

7. A backlight source packaging module, comprising a backlight panel and at least two light-homogenizing films stacked together, wherein the first end surface of the light-homogenizing film serves as an incident end surface and the second end surface of the light-homogenizing film serves as an emitting end surface, wherein: The light homogenizing film is as described in any one of claims 1 to 6.

8. The backlight package module according to claim 7, wherein: The light homogenizing films are identical.

9. The backlight package module according to claim 7 or 8, characterized in that: It includes two light-enhancing prism sheets located outside the exit end face of the light-homogenizing film. The exit end face of the light-enhancing prism sheet is arranged with multiple horizontal prisms. The prism axes of the prisms of the same light-enhancing prism sheet are parallel to each other. The placement directions of the two light-enhancing prism sheets differ by 90°, and the angle difference deviation is within plus or minus 10°.

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