CN216979530U

CN216979530U - Diffusion structure light splitting film and Mini LED backlight module

Info

Publication number: CN216979530U
Application number: CN202220727074.5U
Authority: CN
Inventors: 张立典; 何丽丽
Original assignee: Dongguan Light Chi Photoelectric Co ltd
Current assignee: Dongguan Light Chi Photoelectric Co ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2022-07-15
Anticipated expiration: 2032-03-30

Abstract

The utility model discloses a diffusion structure light splitting film and a Mini LED backlight module, wherein the diffusion structure light splitting film comprises a substrate, a plurality of diffusion structures are distributed on the upper surface of the substrate, a plurality of quadrangular pyramid inner concave structures or quadrangular prism inner concave structures or arc inner concave structures are arranged on the lower surface of the substrate, the plurality of quadrangular pyramid inner concave structures and quadrangular prism inner concave structures are adjacently arranged in a matrix or equidistantly arranged in the matrix, the plurality of arc inner concave structures comprise a plurality of first arc inner concave structures and a plurality of second arc inner concave structures, the plurality of first arc inner concave structures are adjacently arranged along an X axis to form a plurality of arc inner concave units equidistantly arranged along the Y axis, and a plurality of second arc inner concave structures equidistantly arranged along the X axis are arranged on two sides of each arc inner concave unit. The utility model can achieve the effect of uniformizing the brightness of the display screen by utilizing the concave structure on the lower surface of the light splitting film, and is beneficial to improving the light splitting effect by utilizing the diffusion effect of the diffusion structure on the upper surface of the light splitting film.

Description

Diffusion structure light splitting film and Mini LED backlight module

Technical Field

The utility model relates to the technical field of backlight display, in particular to a light splitting film with a diffusion structure and a Mini LED backlight module.

Background

Most of the liquid crystal displays in the existing market are backlight displays, and comprise a shell, and a liquid crystal screen and a backlight module which are arranged in the shell. Since the lcd does not emit light, the light source provided by the backlight module on the back of the lcd is needed to display the image normally. Therefore, the backlight module is one of the key components of the lcd. The traditional backlight module is designed as the structure shown in fig. 1, and is composed of a first brightness enhancement film 20, a second brightness enhancement film 30, a diffusion sheet 40, a light guide plate 50 and a reflection sheet 60 which are sequentially arranged on the back surface of a liquid crystal screen 10, wherein an LED 70 is arranged on one side of the light guide plate 50, the light guide plate 50 and the reflection sheet 60 guide the scattering direction of LED light, the diffusion sheet 40 diffuses the LED light, the brightness uniformity is improved, and finally the two layers of brightness enhancement films are used for improving the brightness of the light. For the backlight module with such a structure, the light emitted from the LED 70 cannot enter the light guide plate 50 completely, on one hand, a part of the light (about 20% to 30% of the light with a large angle) cannot be emitted from the light emitting surface of the LED 70 due to total internal reflection, and on the other hand, even if the light emitted from the light emitting surface of the LED is reflected by the light incident surface of the light guide plate 50, a part of the light cannot enter the light guide plate 50, which both causes low coupling efficiency and poor picture uniformity. The direct type Mini LED backlight module can replace the traditional side lamp type backlight module, has the advantages of improving the optical coupling efficiency, and can improve the display effect of the color gamut by matching the blue light source with the quantum dot film, but has the defect that one lamp can be seen visually.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a light splitting film with a diffusion structure and a Mini LED backlight module.

The technical scheme of the utility model is as follows:

on the one hand, provide a diffusion barrier beam splitting membrane, including the basement, the upper surface distribution of basement has a plurality of diffusion barrier, the lower surface of basement is equipped with a plurality of pyramid inner concave structure or quadrangular prism inner concave structure or arc inner concave structure, a plurality of pyramid inner concave structure, quadrangular prism inner concave structure are that the matrix is adjacent arranges or matrix equidistance arranges, a plurality of arc inner concave structure includes a plurality of first arc inner concave structure and a plurality of second arc inner concave structure, a plurality of first arc inner concave structure is adjacent arranges along the X axle and is formed a plurality of along the arc sunken unit that the Y axle equidistance was arranged, and the both sides of every arc sunken unit are equipped with a plurality of along the second arc inner concave structure that the X axle equidistance was arranged.

Optionally, the density of the diffusion structures on the upper surface of the substrate corresponding to the LED lamps is lower than the density of the diffusion structures on the non-LED lamps.

Optionally, the upper surface of the substrate does not have a diffusion structure at a position corresponding to the LED lamp.

Wherein, the thickness B of the substrate is 20-200 um or 200-600 um.

In a technical scheme, the lower surface of basement is equipped with the pyramid indent structure that a plurality of is the adjacent arrangement of matrix, the height H of pyramid indent structure is 10 ~ 400um, the top surface of pyramid indent structure is the rectangle, and its length of side P is 10 ~ 600um, the base angle A of pyramid indent structure is 70 degrees ~ 110 degrees.

In a technical scheme, the lower surface of basement is equipped with the pyramid indent structure that a plurality of was arranged in matrix equidistance, the height H of pyramid indent structure is 10 ~ 400um, the top surface of pyramid indent structure is the rectangle, and its length of side P is 10 ~ 600um, the base angle A of pyramid indent structure is 70 degrees ~ 110 degrees, and the interval W1 of two adjacent pyramid indent structures is less than P/2.

In a technical scheme, the lower surface of base is equipped with a plurality of and is the adjacent quadrangular internal concave structure who arranges of matrix, the height H of quadrangular internal concave structure is 10 ~ 400um, the top surface of quadrangular internal concave structure is the rectangle, and its length of side P is 10 ~ 600um, the bottom surface of quadrangular internal concave structure is the rectangle, and its length of side W2 is less than P/2.

In a technical scheme, the lower surface of base is equipped with the quadrangular internal concave structure that a plurality of is the matrix equidistance and arranges, the height H of quadrangular internal concave structure is 10 ~ 400um, the top surface of quadrangular internal concave structure is the rectangle, and its length of side P is 10 ~ 600um, the bottom surface of quadrangular internal concave structure is the rectangle, and its length of side W2 is less than P/2, and the interval W1 of two adjacent quadrangular internal concave structures is less than P/2.

In a technical scheme, the lower surface of basement is equipped with the arc that a plurality of is constituteed by first arc indent structure and caves in the unit and a plurality of second arc indent structure, the high H of first arc indent structure and second arc indent structure is 10 ~ 400um, the top surface of first arc indent structure and second arc indent structure is circular, and its length of side P is 10 ~ 600um, the arc indent radius R of first arc indent structure and second arc indent structure is 70 degrees ~ 110 degrees, and the interval W1 of two adjacent arc indent units, second arc indent structure is less than P2.

On the other hand, provide a Mini LED backlight unit, including setting gradually first brightness enhancement film, second brightness enhancement film, quantum dot film and the Mini LED lamp plate at the LCD screen back, its characterized in that: and two layers of the diffusion structure light splitting films are arranged between the second brightness enhancement film and the quantum dot film.

Compared with the prior art, the utility model has the beneficial effects that: the utility model adopts a Mini LED lamp panel direct-in structure to replace a lateral-in structure consisting of a traditional LED and a light guide plate, the Mini LED lamp panel has high light emitting directivity, the light emitting surface of the LED basically has no total internal reflection, the light emitting of the LED basically can enter completely, the coupling efficiency is high and basically reaches 100%, in addition, a light splitting film with a special structure is adopted to replace a traditional diffusion sheet, the LED light emitting source with high directivity can be dispersed by utilizing the concave structure of the lower surface of the light splitting film through the optical principles of refraction, total reflection, light accumulation and the like, the brightness homogenization effect of a display screen is reached, and in addition, the diffusion effect of the diffusion structure on the upper surface of the light splitting film is utilized, and the light splitting effect is favorably improved.

Drawings

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

FIG. 1 is a schematic structural diagram of a conventional backlight module;

FIG. 2 is a schematic structural diagram of a Mini LED backlight module according to the present invention;

fig. 3 is a schematic structural diagram of a light-splitting film of a diffusion structure according to an embodiment of the present invention;

fig. 4 is a schematic size diagram of a light-splitting film of a diffusion structure according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a light-splitting film of a diffusion structure according to a second embodiment of the present invention;

fig. 6 is a schematic size diagram of a light-splitting film of a diffusion structure according to a second embodiment of the present invention;

fig. 7 is a schematic structural diagram of a light-splitting film of a diffusion structure according to a third embodiment of the present invention;

fig. 8 is a schematic size diagram of a light-splitting film of a diffusion structure according to a third embodiment of the present invention;

fig. 9 is a schematic structural diagram of a light-splitting film of a diffusion structure according to a fourth embodiment of the present invention;

fig. 10 is a schematic size diagram of a diffusion structure light-splitting film according to a fourth embodiment of the present invention;

fig. 11 is a schematic structural diagram of a light-splitting film of a diffusion structure according to a fifth embodiment of the present invention;

fig. 12 is a schematic size diagram of a diffusion structure light-splitting film according to a fifth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Referring to fig. 2, the present invention provides a Mini LED backlight module, which is composed of a first brightness enhancement film 2, a second brightness enhancement film 3, two diffusion structure light splitting films 4, a quantum dot film 5 and a Mini LED lamp panel 6, which are sequentially disposed on the back surface of a liquid crystal display 1. The upper surface of the Mini LED lamp panel 6 is provided with a plurality of blue LEDs which are uniformly distributed, the light emitting directivity is high, total internal reflection does not exist on the LED light emitting surface basically, all the light emitted by the LEDs can enter the upper layer basically, the coupling efficiency is high and reaches 100% basically; the quantum dot film 5 can change the color of light emitted by the Mini LED lamp panel 6, so that blue light is changed into white light; the lower surface of the diffusion structure light splitting film 4 is provided with an inner concave structure, and through the optical principles of refraction, total reflection, light accumulation and the like, the LED luminous source with high directivity can be dispersed to achieve the effect of uniformizing the brightness of the display screen, wherein the inner concave structure comprises a quadrangular pyramid inner concave structure, a quadrangular prism inner concave structure and an arc inner concave structure; the upper surface of diffusion structure beam-splitting membrane 4 is equipped with diffusion structure, through diffusion structure's diffuse action, helps improving the beam-splitting effect to combine first brightness enhancement film 2, second brightness enhancement film 3, can improve display screen luminance.

In order to explain the technical means of the present invention, the following description will be given by way of specific examples.

Example one

As shown in fig. 3, the light splitting film 4 includes a substrate 41, and a diffusion structure 46 is disposed on an upper surface of the substrate 41, optionally, the density of the diffusion structure on the upper surface of the substrate 41 corresponding to the LED lamp is lower than the density of the diffusion structure on the non-LED lamp, or the diffusion structure is not disposed on the upper surface of the substrate 41 corresponding to the LED lamp, so that the high brightness on the corresponding LED lamp is reduced, the low brightness on the non-LED lamp is maintained, and bright-dark contrast is formed; the lower surface of the substrate 41 is provided with a plurality of rectangular pyramid concave structures 42 which are adjacently arranged in a matrix, and the purpose of uniformizing the brightness of the display screen is achieved through the rectangular pyramid concave structures 42 and the combination of optical principles such as refraction, total reflection and light accumulation.

For the purpose of realizing the brightness uniformity of the display screen, the size of each part of the quadrangular pyramid concave structure 42 is required. As shown in fig. 4, the substrate 41 may have a thickness B of 20-200 um or 200-600 um, where B is 20-200 um suitable for mobile phones and NBs, and B is 200-600 um suitable for MNTs and TVs; the height H of the quadrangular pyramid concave structure 42 is 10-400 um; the top surface of the quadrangular pyramid concave structure 42 is rectangular, and the side length P is 10-600 um; the base angle A of the quadrangular pyramid concave structure 42 is 70-110 degrees.

Example two

As shown in fig. 5, the light splitting film 4 includes a substrate 41, and a diffusion structure 46 is disposed on an upper surface of the substrate 41, optionally, the density of the diffusion structure on the upper surface of the substrate 41 corresponding to the LED lamp is lower than the density of the diffusion structure on the non-LED lamp, or the diffusion structure is not disposed on the upper surface of the substrate 41 corresponding to the LED lamp, so that the high brightness on the corresponding LED lamp is reduced, the low brightness on the non-LED lamp is maintained, and bright-dark contrast is formed; the lower surface of the substrate 41 is provided with a plurality of rectangular pyramid concave structures 42 arranged in a matrix at equal intervals, and the purpose of uniformizing the brightness of the display screen is achieved by the rectangular pyramid concave structures 42 and the combination of optical principles such as refraction, total reflection and light accumulation.

For the purpose of realizing the brightness uniformity of the display screen, the size of each part of the quadrangular pyramid concave structure 42 is required. As shown in fig. 6, the substrate 41 may have a thickness B of 20-200 um or 200-600 um, where B is 20-200 um suitable for mobile phones and NBs, and B is 200-600 um suitable for MNTs and TVs; the height H of the quadrangular pyramid concave structure 42 is 10-400 um; the top surface of the quadrangular pyramid concave structure 42 is rectangular, and the side length P is 10-600 um; the base angle A of the quadrangular pyramid concave structure 42 is 70-110 degrees; the spacing W1 between two adjacent quadrangular pyramid concave structures 42 is smaller than P/2.

EXAMPLE III

As shown in fig. 7, the light splitting film 4 includes a substrate 41, and the upper surface of the substrate 41 is provided with a diffusion structure 46, optionally, the density of the diffusion structure on the upper surface of the substrate 41 corresponding to the LED lamp is lower than the density of the diffusion structure on the non-LED lamp or the upper surface of the substrate 41 corresponding to the LED lamp does not have a diffusion structure, so that the high brightness on the corresponding LED lamp is reduced, the low brightness on the non-LED lamp is maintained, and bright-dark contrast is formed; the lower surface of the substrate 41 is provided with a plurality of rectangular prism concave structures 43 which are arranged adjacently in a matrix, and the purpose of uniformizing the brightness of the display screen is achieved through the rectangular prism concave structures 43 and the combination of optical principles such as refraction, total reflection and light accumulation.

For the purpose of realizing the brightness uniformity of the display screen, the size of each part of the quadrangular prism concave structure 43 is required. As shown in fig. 8, the substrate 41 may have a thickness B of 20-200 um or 200-600 um, where B is 20-200 um suitable for mobile phones and NBs, and B is 200-600 um suitable for MNTs and TVs; the height H of the quadrangular prism concave structure 43 is 10-400 um; the top surface of the quadrangular prism concave structure 43 is rectangular, and the side length P is 10-600 um; the bottom surface of the quadrangular prism concave structure 43 is rectangular, and the side length W2 of the quadrangular prism concave structure is less than P/2.

Example four

As shown in fig. 9, the light splitting film 4 includes a substrate 41, and the upper surface of the substrate 41 is provided with a diffusion structure 46, optionally, the density of the diffusion structure on the upper surface of the substrate 41 corresponding to the LED lamp is lower than the density of the diffusion structure on the non-LED lamp or the upper surface of the substrate 41 corresponding to the LED lamp does not have the diffusion structure, so that the high brightness on the corresponding LED lamp is reduced, the low brightness on the non-LED lamp is maintained, and bright-dark contrast is formed; the lower surface of the substrate 41 is provided with a plurality of rectangular prism concave structures 43 which are arranged in a matrix and in an equidistant manner, and the purpose of uniformizing the brightness of the display screen is realized by the rectangular prism concave structures 43 and the combination of optical principles such as refraction, total reflection and light accumulation.

For the purpose of realizing the brightness uniformity of the display screen, the size of each part of the quadrangular prism concave structure 43 is required. As shown in fig. 10, the substrate 41 may have a thickness B of 20-200 um or 200-600 um, where B is 20-200 um suitable for mobile phones and NBs, and B is 200-600 um suitable for MNTs and TVs; the height H of the quadrangular prism concave structure 43 is 10-400 um; the top surface of the quadrangular prism concave structure 43 is rectangular, and the side length P of the quadrangular prism concave structure is 10-600 um; the bottom surface of the quadrangular prism concave structure 43 is rectangular, and the side length W2 of the rectangular prism concave structure is less than P/2; the distance W1 between two adjacent quadrangular prism concave structures 43 is less than P/2.

EXAMPLE five

As shown in fig. 11, the light splitting film 4 includes a substrate 41, and a diffusion structure 46 is disposed on an upper surface of the substrate 41, optionally, the density of the diffusion structure on the upper surface of the substrate 41 corresponding to the LED lamp is lower than the density of the diffusion structure on the non-LED lamp, or the diffusion structure is not disposed on the upper surface of the substrate 41 corresponding to the LED lamp, so that the high brightness on the corresponding LED lamp is reduced, the low brightness on the non-LED lamp is maintained, and bright-dark contrast is formed; the lower surface of basement 41 is equipped with a plurality of arc inner concave structure, a plurality of arc inner concave structure includes a plurality of first arc inner concave structure 44 and a plurality of second arc inner concave structure 45, a plurality of first arc inner concave structure 44 is along X axle adjacent arrange form a plurality of along the arc sunken unit that Y axle equidistance was arranged, the both sides of every arc sunken unit are equipped with a plurality of along the second arc inner concave structure 45 that X axle equidistance was arranged, through first arc inner concave structure 44 and second arc inner concave structure 45 and combine refraction, the total reflection, optics principles such as light accumulation, realize display screen luminance homogenization purpose.

For the purpose of brightness uniformity of the display screen, the sizes of the parts of the first arc-shaped concave structure 44 and the second arc-shaped concave structure 45 are required. As shown in fig. 12, the substrate 41 may have a thickness B of 20 to 200um or 200 to 600um according to the customer's requirement, where B is 20 to 200um for mobile phone and NB, and B is 200 to 600um for MNT and TV; the height H of the first arc-shaped concave structure 44 and the second arc-shaped concave structure 45 is 10-400 um; the top surfaces of the first arc-shaped concave structure 44 and the second arc-shaped concave structure 45 are circular, and the side length P of the first arc-shaped concave structure is 10-600 micrometers; the arc concave radius R of the first arc concave structure 44 and the second arc concave structure 45 is 70-110 degrees; the distance W1 between two adjacent arc-shaped concave units and the second arc-shaped concave structure 45 is less than P/2.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A diffusion structure light-splitting film comprises a substrate, and is characterized in that: the utility model discloses a solar cell module, including basement, a plurality of first arc indent structure of a plurality of and a plurality of second arc indent structure, the upper surface distribution of basement has a plurality of diffusion structures, the lower surface of basement is equipped with a plurality of pyramid indent structure or quadrangular prism indent structure or arc indent structure, a plurality of pyramid indent structure, quadrangular prism indent structure are matrix adjacent and arrange or matrix equidistance arranges, a plurality of arc indent structure includes a plurality of first arc indent structure and a plurality of second arc indent structure, a plurality of first arc indent structure is arranged along X axle adjacent and is formed a plurality of arc sunken unit of arranging along Y axle equidistance, and the both sides of every arc sunken unit are equipped with a plurality of second arc indent structure of arranging along X axle equidistance.

2. A diffusion structure beam splitting film according to claim 1, wherein: the density of the diffusion structures on the upper surface of the substrate corresponding to the LED lamps is lower than that of the diffusion structures on the non-LED lamps.

3. A diffusion structure splitting film according to claim 1, wherein: the upper surface of the substrate is not provided with a diffusion structure corresponding to the LED lamp.

4. A diffusion structure beam splitting film according to claim 1, wherein: the thickness B of the substrate is 20-200 um or 200-600 um.

5. A diffusion structure splitting film according to claim 1 or 4, wherein: the lower surface of basement is equipped with the adjacent quadrangular pyramid indent structure who arranges of a plurality of matrix, the height H of quadrangular pyramid indent structure is 10 ~ 400um, the top surface of quadrangular pyramid indent structure is the rectangle, and its length of side P is 10 ~ 600um, the base angle A of quadrangular pyramid indent structure is 70 degrees ~ 110 degrees.

6. A diffusion structure beam splitting film according to claim 1 or 4, wherein: the lower surface of basement is equipped with the pyramid indent structure that a plurality of was arranged of matrix equidistance, the height H of pyramid indent structure is 10 ~ 400um, the top surface of pyramid indent structure is the rectangle, and its length of side P is 10 ~ 600um, the base angle A of pyramid indent structure is 70 degrees ~ 110 degrees, and the interval W1 of two adjacent pyramid indent structures is less than P2.

7. A diffusion structure beam splitting film according to claim 1 or 4, wherein: the lower surface of base is equipped with a plurality of and is the adjacent quadrangular internal concave structure who arranges of matrix, the height H of quadrangular internal concave structure is 10 ~ 400um, the top surface of quadrangular internal concave structure is the rectangle, and its length of side P is 10 ~ 600um, the bottom surface of quadrangular internal concave structure is the rectangle, and its length of side W2 is less than P/2.

8. A diffusion structure splitting film according to claim 1 or 4, wherein: the lower surface of base is equipped with the quadrangular internal concave structure that a plurality of is matrix equidistance and arranges, the height H of quadrangular internal concave structure is 10 ~ 400um, the top surface of quadrangular internal concave structure is the rectangle, and its length of side P is 10 ~ 600um, the bottom surface of quadrangular internal concave structure is the rectangle, and its length of side W2 is less than P/2, and the interval W1 of two adjacent quadrangular internal concave structures is less than P/2.

9. A diffusion structure splitting film according to claim 1 or 4, wherein: the lower surface of basement is equipped with the arc sunken unit and the second arc concave structure of a plurality of by first arc concave structure is constituteed, the high H of first arc concave structure and second arc concave structure is 10 ~ 400um, the top surface of first arc concave structure and second arc concave structure is circular, and its length of a side P is 10 ~ 600um, the arc indent radius R of first arc concave structure and second arc concave structure is 70 degrees ~ 110 degrees, and the interval W1 of two adjacent arc sunken units, second arc concave structure is less than P2.

10. The utility model provides a Mini LED backlight unit, is including setting gradually first brightness enhancement film, second brightness enhancement film, quantum dot film and the Mini LED lamp plate at the LCD screen back, its characterized in that: two or more diffusion structure light-splitting films as claimed in any one of claims 1 to 9 are arranged between the second brightness enhancement film and the quantum dot film.