CN114815023A - Diffusion film, diffusion plate, backlight module and electronic equipment - Google Patents

Diffusion film, diffusion plate, backlight module and electronic equipment Download PDF

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Publication number
CN114815023A
CN114815023A CN202210638305.XA CN202210638305A CN114815023A CN 114815023 A CN114815023 A CN 114815023A CN 202210638305 A CN202210638305 A CN 202210638305A CN 114815023 A CN114815023 A CN 114815023A
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China
Prior art keywords
light
layer
diffusion
diffusion layer
convex
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Chinese (zh)
Inventor
朋朝明
文勇兵
朱寿天
周辉
陈伟雄
邹文聪
侯亚荣
阳楚良
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Shenzhen Skyworth RGB Electronics Co Ltd
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Shenzhen Skyworth RGB Electronics Co Ltd
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Priority to CN202210638305.XA priority Critical patent/CN114815023A/en
Publication of CN114815023A publication Critical patent/CN114815023A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The invention discloses a diffusion film, a diffusion plate, a backlight module and electronic equipment, wherein the diffusion film comprises a diffusion layer and a light-gathering layer, the diffusion layer comprises a first side and a second side which are arranged oppositely, the first side is used for being attached to the light-emitting side of the diffusion plate, a plurality of first convex parts are convexly arranged on the second side of the diffusion layer, and each first convex part comprises a first surface which is arranged opposite to the second side and a plurality of second surfaces which are arranged along the direction far away from the second side and are gradually inclined inwards. The invention aims to solve the problem that local brightness and darkness are uneven due to insufficient light mixing of backlight visual effect after the light mixing distance is gradually reduced, namely the distance between the surface of a light source of a backlight module and a diffusion plate is reduced.

Description

Diffusion film, diffusion plate, backlight module and electronic equipment
Technical Field
The invention relates to the technical field of displays, in particular to a diffusion film, a diffusion plate, a backlight module and electronic equipment.
Background
The liquid crystal display module comprises LCD panel and backlight unit, according to the light source position, present LCD module mainly divide into straight following formula and side income formula two kinds, because the consumer extremely meets the demands to product appearance, the LCD TV frame is more and more narrow, product thickness is more and more thin, for satisfying the demand of product ultra-thin thickness, diffuser plate and LED interval are more and more littleer among the backlight unit, the module cavity diminishes, the light optical path shortens, mix the inequality, lead to the bright dark inequality of picture, the poor difficult problem that has become the module design of picture degree of consistency. In order to meet the requirement of high uniformity of the backlight module, the distance between the LEDs can only be continuously reduced, the number of the LEDs in the module is exponentially increased by the method, the power consumption of products is higher and higher, and an optical element with high uniformity is urgently needed to meet the requirement of the current ultrathin products. In addition, the MiniLED and the quantum dot product have the characteristics of ultrahigh contrast, ultrahigh brightness, ultrahigh color gamut and the like, so that the MiniLED and the quantum dot product are quickly paid attention to the market, and are easy to understand, when the backlight uniformity is poor and the brightness of a picture is uneven, the effect of uniform excitation of the quantum dot optical film cannot be achieved, and the picture has the adverse phenomena of being reddish and greenish, being blue and the like.
Disclosure of Invention
The invention mainly aims to provide a diffusion film, a diffusion plate, a backlight module and electronic equipment, and aims to solve the problem that local brightness and darkness are uneven due to insufficient light mixing of a backlight visual effect after a light mixing distance is gradually reduced, namely the distance between the light source surface of the backlight module and the diffusion plate is reduced.
To achieve the above object, the present invention provides a diffusion membrane comprising:
the diffusion layer comprises a first side and a second side which are arranged oppositely, the first side is used for being attached to the light emitting side of the diffusion plate, a plurality of first convex parts are convexly arranged on the second side of the diffusion layer, and each first convex part comprises a first surface which is arranged opposite to the second side and a plurality of second surfaces which are arranged along the direction far away from the second side and gradually incline inwards; and the number of the first and second groups,
the light-gathering layer is arranged on the second side and is attached to the diffusion layer, a plurality of grooves are concavely formed in one side, close to the diffusion layer, of the light-gathering layer, each groove is used for being embedded into the corresponding first convex portion, a plurality of second convex portions are convexly arranged on one side, far away from the diffusion layer, of the light-gathering layer, and each second convex portion is arranged in a gradually-reduced mode along the direction far away from the diffusion layer;
wherein the refractive index of the diffusion layer is greater than the refractive index of the light-condensing layer.
Optionally, at least two of the second protrusions have different heights in a direction away from the diffusion layer.
Optionally, in two adjacent second convex portions, a height of one second convex portion in a direction away from the diffusion layer is a, and a height of the other second convex portion in a direction away from the diffusion layer is B, where a > B.
Optionally, the second protrusion includes a plurality of third faces that are disposed along a direction away from the diffusion layer and gradually inclined inward, and an included angle between each of the third faces and the light-gathering layer is the same.
Optionally, an included angle between each third surface and the light-gathering layer is C, and the refractive index of the second protrusion is n 1 ；
Wherein, C ═ arcsin (1/n) 2 )*180/3.1415926。
Optionally, an included angle between each second surface and the second side is D, and the refractive index of the light-condensing layer is n 2 The refractive index of the first convex part is n 3 ；
Wherein D ═ arcsin (n) 2 /n 3 )*180/3.1415926。
The invention also provides a diffusion plate, which is characterized by comprising:
the light source comprises a body part and a light source body, wherein the body part comprises a light inlet side and a light outlet side which are oppositely arranged; and the number of the first and second groups,
and the diffusion film is arranged on the light emergent side of the body part and is the diffusion film.
Optionally, the body portion includes a first substrate, a second substrate, and a color conversion layer, the first substrate is disposed on a first side of the diffusion film, the second substrate is disposed on a side of the first substrate away from the diffusion film, the color conversion layer is disposed between the first substrate and the second substrate, and the color conversion layer is used to encapsulate the quantum dots.
The present invention further provides a backlight module, which includes:
a light source; and the number of the first and second groups,
a diffuser plate disposed on a light exit side of the light source, the diffuser plate comprising the diffuser plate as described above.
The invention also provides an electronic device, which comprises the backlight module.
In the technical scheme of the invention, the diffusion layer and the light-gathering layer with different refractive indexes are overlapped, so that a refractive index difference interface is generated between the diffusion layer and the light-gathering layer to generate a light refraction phenomenon, and because the refractive index of the diffusion layer is greater than that of the light-gathering layer, the incident angle of light entering the light-gathering layer from the diffusion layer is smaller than the refractive angle of the light-gathering layer, so that part of light emitted from the diffusion layer can be emitted towards a large visual angle, meanwhile, a plurality of first convex parts are convexly arranged on the second side, the first surface of each first convex part can be used for normally emitting part of light emitted from the first convex parts, so as to ensure that the brightness of the area provided with the first convex parts on the diffusion layer is not reduced, and the second surfaces are arranged at an angle with the second side, part of the light penetrating out of the second surface can be refracted so as to change the light-emitting angle, and part of the light penetrating out of the second surface can also be totally reflected so as to reduce the light energy of the light emitted from the center of the LED, balance the light energy ratio of the center to the two sides and further achieve the effect of light uniformization; in addition, what set up protrudingly on the spotlight layer is a plurality of the convergent setting the second convex part compares traditional flat bed structure, has reduced terminal incident angle, and optical terminal outgoing interface can collect the mixed and disorderly light that the angle is bigger than, makes light gather more, and light-emitting efficiency is higher, has changed the total reflection light that originally incidents and is greater than the critical angle promptly, makes this part light normally follow spotlight layer 3 jets out, has improved the light-emitting efficiency of light. That is, the present invention solves the problem of local uneven brightness of the backlight effect due to insufficient light mixing after the distance between the light source surface of the backlight module and the diffuser plate is reduced under the combined action of the diffuser layer and the light-gathering layer.
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 structures shown in the drawings without creative efforts.
Fig. 1 is an exploded schematic view of an embodiment of a diffuser plate according to the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
fig. 3 is a partially enlarged view of B in fig. 1.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R)
100 Diffusion plate 4 Groove
10 Diffusion film 5 Second convex part
1 Diffusion layer 5a Third side
1a First side 6 Body part
1b Second side 61 First substrate
2 First convex part 62 Color conversion layer
2a First side 63 Second substrate
2b Second surface 7 Even light layer
3 Light-gathering layer
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B", including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The liquid crystal display module comprises LCD panel and backlight unit, according to the light source position, present LCD module mainly divide into straight following formula and side income formula two kinds, because the consumer extremely meets the demands to product appearance, the LCD TV frame is more and more narrow, product thickness is more and more thin, for satisfying the demand of product ultra-thin thickness, diffuser plate and LED interval are more and more littleer among the backlight unit, the module cavity diminishes, the light optical path shortens, mix the inequality, lead to the bright dark inequality of picture, the poor difficult problem that has become the module design of picture degree of consistency. In order to meet the requirement of high uniformity of the backlight module, the distance between the LEDs can only be continuously reduced, the number of the LEDs in the module is exponentially increased by the method, the power consumption of products is higher and higher, and an optical element with high uniformity is urgently needed to meet the requirement of the current ultrathin products. In addition, the Mini LED and the quantum dot product have the characteristics of ultrahigh contrast, ultrahigh brightness, ultrahigh color gamut and the like, so that the market is rapidly pursued, the understanding is easy, when the backlight uniformity is poor and the brightness of the picture is uneven, the effect of uniformly exciting the quantum dot optical film cannot be completed, and the picture has the adverse phenomena of red bias, green bias, blue bias and the like
In view of the above, the present invention provides a diffusion film, and fig. 1 to 3 illustrate an embodiment of the present invention.
Referring to fig. 1 to 3, the diffusion film 10 includes a diffusion layer 1 and a light-condensing layer 3, the diffusion layer 1 includes a first side 1a and a second side 1b that are opposite to each other, the first side 1a is used for being attached to a light-emitting side of the diffusion plate, the diffusion layer 1 is convexly provided with a plurality of first protrusions 2 on the second side 1b, each first protrusion 2 includes a first surface 2a that is opposite to the second side 1b and a plurality of second surfaces 2b that are gradually inclined inward along a direction away from the second side 1 b; the light-gathering layer 3 is arranged on the second side 1b and is attached to the diffusion layer 1, a plurality of grooves 4 are concavely arranged on one side, close to the diffusion layer 1, of the light-gathering layer 3, each groove 4 is used for being embedded into the corresponding first convex part 2, a plurality of second convex parts 5 are convexly arranged on one side, far away from the diffusion layer 1, of the light-gathering layer 3, and each second convex part 5 is gradually reduced along the direction far away from the diffusion layer 1; wherein the refractive index of the diffusion layer 1 is greater than that of the light-condensing layer 3.
In the technical solution of the present invention, by stacking the diffusion layer 1 and the light-gathering layer 3 having different refractive indexes, a refractive index difference interface is generated between the diffusion layer 1 and the light-gathering layer 3 to generate a refraction phenomenon of light, and since the refractive index of the diffusion layer 1 is greater than that of the light-gathering layer 3, an incident angle of light entering the light-gathering layer 3 from the diffusion layer 1 is smaller than a refraction angle thereof, so that a part of light emitted from the diffusion layer 1 can be emitted toward a large viewing angle, and at the same time, the second side 1b is provided with a plurality of the first protrusions 2 in a protruding manner, the first surface 2a of each of the first protrusions 2 allows a part of light emitted from the first protrusion 2 to be emitted normally, so as to ensure that the brightness of a region where the first protrusion 2 is provided on the diffusion layer 1 is not reduced, and each of the second surfaces 2b is provided at an angle with the second side 1b, part of the light penetrating out of the second surface 2b can be refracted so as to change the light-emitting angle, and part of the light penetrating out of the second surface 2b can also be totally reflected so as to reduce the light energy of the light emitted from the center of the LED, balance the light energy ratio of the center and the two sides, and achieve the effect of light uniformization; in addition, what set up protrudingly on the spotlight layer 3 is a plurality of that the convergent sets up second convex part 5 compares traditional flat bed structure, has reduced terminal incident angle, and optical terminal outgoing interface can collect the mixed and disorderly light that the angle is bigger than, makes light gather more, and light-emitting efficiency is higher, has changed the total reflection light that originally incidents and is greater than the critical angle promptly, makes this part light normally follow spotlight layer 3 jets out, has improved the light-emitting efficiency of light. That is, in the present invention, the problem of local brightness unevenness in the backlight visual effect due to insufficient light mixing is solved by the combined action of the diffusion layer 1 and the light-collecting layer 3 after the distance between the surface of the light source of the backlight module and the diffusion plate 100 is reduced.
In the present embodiment, since the first convex portion 2 and the diffusion layer 1 are integrally formed, the refractive index of the first convex portion 2 is the same as the refractive index of the diffusion layer 1; since the second convex portion 5 is integrally formed with the light-condensing layer 3, the refractive index of the second convex portion 5 is the same as the refractive index of the light-condensing layer 3.
Furthermore, since the regularly arranged structure easily interferes with the liquid crystal glass pixel array, display moire defects are caused, that is, display moire defects are easily caused by the plurality of second protrusions 5 which are designed to be in a uniform arrangement; in the present embodiment, the heights of at least two of the second projections 5 in the direction away from the diffusion layer 1 are not equal. The height of at least two second convex parts 5 is different, the second convex parts 5 are changed from a contour pattern to an irregular pattern to improve water ripple and mole ripple, and a protective layer is coated on the back of the second convex parts to prevent the film materials from being adhered together and avoid Newton rings or rainbow rings.
Still further, of the two adjacent second protrusions 5, a height of one second protrusion 5 in a direction away from the diffusion layer 1 is a, and a height of the other second protrusion 5 in a direction away from the diffusion layer 1 is B, where a > B. The second convex parts 5 with different heights are arranged at intervals in a high-low alternative arrangement mode, so that the problem of possible interference with a liquid crystal glass pixel picture can be solved well, and the effect of improving the water ripple and the moire can be further improved.
Specifically, in this embodiment, referring to fig. 3, the second protrusion 5 includes a plurality of third surfaces 5a inclined inward gradually along a direction away from the diffusion layer 1, and included angles between the third surfaces 5a and the light-gathering layer 3 are the same. Through setting up second convex part 5 include a plurality ofly with the third face 5a that contained angle between the spotlight layer 3 is the same, then second convex part 5 is a pyramid structure, and its cross-section is isosceles triangle to can all collect the mixed and disorderly light that the angle is bigger than normal in each direction, make light gather more, luminous efficacy is higher.
Further, since the second convex portion 5 is provided in a triangular shape, that is, the tip of the second convex portion 5 is processed to change the top thereof into a circular arc shape, the scratch resistance is enhanced, and the tip of the second convex portion 5 is processed, so that the second convex portion 5 having different heights can be formed on the light condensing layer 3.
Further, in order to achieve a better effect of collecting the disordered light, the light is more concentrated, and therefore, the included angle between each third surface 5a and the light-gathering layer 3 is set to be a critical angle value of the light entering the air from the light-gathering layer 3, and therefore, the calculation can be performed according to snell's law as follows:
sinθ 1 ·n 1 ＝sinθ 2 ·n 2
since the refractive index of air is 1, in this embodiment, the included angle between each third surface 5a and the light-condensing layer 3 is C, and the refractive index of the second protrusion 5 is n 1 ；
Wherein, C ═ arcsin (1/n) 2 )*180/3.1415926。
In addition, the second protrusions 5 on the light-gathering layer 3 are arranged in a matrix, and two adjacent second protrusions 5 are in contact with each other, so that a plane portion of one side of the light-gathering layer 3 where the second protrusions 5 are installed is not exposed, and compared with a plane portion of the light-gathering layer 3 which is exposed between the two second protrusions 5 at intervals, the light-gathering layer 3 has a stronger light-gathering capability.
In addition, since the plurality of first protrusions 2 are arranged on the second side 1b of the diffusion layer 1, the light-condensing layer 3 is provided with a plurality of grooves 4, into which the first protrusions 2 are fitted, on one end surface corresponding to the first end surface in order to secure the adhesion between the diffusion layer 1 and the light-condensing layer 3.
Further, the first protrusions 2 are arranged in a matrix. Wherein, each first convex part 2 is arranged on the second side 1b in a matrix manner, and two adjacent first convex parts 2 are arranged at intervals, so that an alternating trapezoid cross section is formed on the cross section of the diffusion layer 1, small-angle light rays concentrated in a middle range can be decomposed, the incident angle of the light rays incident to a refractive index difference interface is increased, the angle of emergent light is increased, more light rays can be generated towards two sides, the light emergent angle is increased, the chance of total reflection is increased, the energy of central light emission is reduced, the light energy contrast between the center and two sides is balanced from another aspect, in addition, a plane area existing between two adjacent first convex parts 2 and the corresponding first surface 2a on the first convex part 2 can ensure normal light emission of light rays positioned at the central part, and under the condition that the front view angle brightness is not reduced, a small amount of light is refracted to a large visual angle, so that the application requirement is met.
Further, each of the first convex portions 2 is configured as a truncated pyramid. By arranging each first convex part 2 as a frustum pyramid which has four side surfaces, the angle improvement in two directions of the transverse and longitudinal directions of the diffusion layer 1 can be realized, and the brightness improvement of the dark light area at the opposite side can be more obvious.
Further, since the diffusion film 10 of this embodiment is attached to the diffusion plate 100 and the backlight source is selected as the light source, and the backlight source includes a plurality of LED beads, when the distance between the backlight source and the diffusion plate 100 becomes small, the light optical path becomes short, so that the strong light source incident on the diffusion plate 100 at an angle close to the vertical angle cannot be well dispersed, and thus the strong light source is a main cause of uneven brightness of the picture, specifically, in this embodiment, the included angle between each second surface 2b and the second side 1b is set as the critical angle value at which the light is incident on the light-condensing layer 3 from the diffusion layer 1. By raising the angle between the second surface 2b and the second side 1b as a critical value, the angle between the normal and a part of the light rays which are emitted to the second surface 2b at a vertical angle is greater than or equal to the critical value, so that the chance of total reflection is increased, the light rays are reflected inside the first convex part 2, on one hand, the energy of central light emission is reduced, on the other hand, the light rays at the center and the two sides are balanced, the angle between the second surface 2b at the two sides of the first convex part 2 and the angle between the second side 1b are equal, so that the light emission at the two sides of the first convex part 2 are balanced, and the light mixing is more uniform.
Therefore, an included angle D is set between each second surface 2b and the second side 1b, and the refractive index of the light-condensing layer 3 is n 2 The refractive index of the first convex part 2 is n 3 ；
Wherein D ═ arcsin (n) 2 /n 3 )*180/3.1415926。
In this embodiment, since the light-condensing layer 3 and the second convex portion 5 are made of the same material and are integrally provided, the refractive index n of the second convex portion 5 is set as described above 1 Equal to the refractive index n of the light-concentrating layer 3 2 (ii) a Since the material of the first convex portion 2 is the same as that of the diffusion layer 1 and is integrally provided, the refractive index of each of the first convex portion 2 and the diffusion layer 1 is n 3 Wherein n is more than or equal to 1.3 1 ＝n 2 ≤1.6；1.5≤n 3 ≤1.8。
In one embodiment, n is set 2 ＝1.48，n 3 1.62, the angle between each second face 2b and the second side 1b is 66 degrees according to the calculation formula of calculation D described above.
The invention also provides a diffusion plate 100, wherein the diffusion plate 100 comprises a body part 6 and a diffusion film 10, the body part 6 comprises a light incident side and a light emergent side which are oppositely arranged, and the light incident side of the body part 6 is used for facing a light source; the diffusion film 10 is disposed on the light emitting side of the main body 6, the diffusion film 10 includes the diffusion film 10 as described above, and the specific structure of the diffusion film 10 refers to the above embodiments, and since the diffusion plate 100 adopts all technical solutions of all the above embodiments, it is not described herein again.
The arrangement form of the body portion 6 is not limited, in an embodiment, the body portion 6 includes a first substrate 61, a second substrate 63, and a color conversion layer 62, the first substrate 61 is disposed on the first side 1a of the diffusion film 10, the second substrate 63 is disposed on a side of the first substrate 61 facing away from the diffusion film 10, the color conversion layer 62 is disposed between the first substrate 61 and the second substrate 63, and the color conversion layer 62 encapsulates quantum dots therein.
In another embodiment, the body part 6 may include the first substrate 61 and the color conversion layer 62 or include the second substrate 63 and the color conversion layer 62; in yet another embodiment, the body portion 6 may include only the first substrate 61 and the second substrate 63.
In addition to the body part 6 including the first substrate 61, the second substrate 63 and the color conversion layer 62, in order to delay the light emission, the air with low refractive index is added to the single refractive index material by using the difference of refractive indexes, so as to satisfy the total reflection condition.
The material of the light conversion layer is not limited, the light conversion layer is a mixed composite material comprising any one or two or more of PET, PS, PC, PMMA, inorganic glass and the like, the body part 6 is formed by three layers of co-extrusion and lamination of the first substrate 61, the color conversion layer 62 and the second substrate 63, a plurality of bubbles are generated inside the first substrate 61 and the second substrate 63 during extrusion forming, the volume ratio of the bubbles in the second substrate 63 is 10-20%, the bubbles are in an olive shape, the interface is in an oval shape, the long side size is 10-12um, and the short side size is 5-8 um. The volume ratio of the bubbles in the first substrate 61 is 5-10%, the bubbles are football-shaped, the interface is elliptical, the size of the long side is 10-12um, and the size of the short side is 5-8 um; the light outgoing can be delayed by forming and generating air bubbles in the first substrate 61 and the second substrate 63, and by utilizing the difference of refractive indexes, low-refractive-index air is added in a single refractive-index material to meet the total reflection condition, and the air bubbles in the second substrate 63 are more than the air bubbles in the first substrate 61, so that when the light does not touch the color conversion layer 62, the light first contacts with the air bubbles in the second substrate 63, wherein the air bubbles are more, the probability of total reflection is higher to delay the light outgoing, and the air bubbles in the first substrate 61 are less, so that the light outgoing efficiency is improved, and the light is converted by the color conversion layer 62 and is not easy to be reflected to the bottom position again.
Further, the body part 6 further includes a light uniformizing layer 7, the light uniformizing layer 7 is disposed by being attached to the second substrate 63, and a plurality of concave parts are recessed on a side surface of the light uniformizing layer 7 away from the second substrate 63. The light homogenizing layer 7 is attached, and a plurality of concave parts are concavely arranged on one end face, facing the backlight source, of the light homogenizing layer 7, so that the reflection capability of the light homogenizing layer 7, facing one end face of the backlight source, is improved, a larger optical path can be obtained, and better mixed light is facilitated. Specifically, in this embodiment, the main body of the light uniformizing layer 7 is an acrylic polymer resin, the refractive index of the acrylic polymer resin is between 1.48 and 1.72, the volume content of the acrylic polymer resin is about 30 to 40%, the interior of the acrylic polymer resin contains a high-reflection material TiO2& SiO2, and the volume content of the acrylic polymer resin is 15 to 20%, so as to improve the reflection capability of the light uniformizing layer 7, wherein since the resin material of the light uniformizing layer 7 is a UV series, and needs to be cured by UV light irradiation, the light uniformizing layer 7 further contains 10 to 15% of a ketone solvent and 1 to 5% of an auxiliary thereof, and 20 to 30% of an initiator, so as to satisfy the conditions of UV curing; the depth of the plurality of concave parts is a random variation value, the depth range is between 5 and 25um, and the light homogenizing layer 7 is rough and uneven on one end surface facing the backlight source, and can reflect more light rays compared with the existing smooth surface, so that the optical path is increased.
The present invention further provides a backlight module, where the backlight module includes a light source and a diffusion plate 100, the diffusion plate 100 is disposed on a light exit side of the light source, the diffusion plate 100 includes the diffusion plate 100 as described above, and the specific structure of the diffusion plate 100 refers to the above embodiments.
The backlight module is formed by sequentially superposing a light source, a reflector plate, a light guide plate, a diffusion plate 100 and an optical plate, wherein the light homogenizing layer 7 on the diffusion plate 100 faces the light source, and the diffusion film 10 is attached to one side of the diffusion plate 100 deviating from the light source, namely the diffusion layer 1 is attached to the first substrate 61 on the diffusion plate 100.
Optionally, the light source is a backlight source and is a blue light source, and the quantum dots encapsulated in the diffusion plate 100 are red and green quantum dots. Through setting up the backlight is blue light source, because in the visible light, the wavelength is more terminal, and the refracting index is bigger, and the refracting index of blue light is the biggest promptly, and its critical angle is minimum, adopts blue light MINILED light source effect more obvious. The blue light is reflected and then repeatedly excites the quantum dots, so that the quantum dots are excited more fully, and the light emitting efficiency is improved. Meanwhile, the light source adopts blue light, that is, the corresponding quantum dots encapsulated in the color conversion layer 62 are red and green quantum dots, so as to meet the requirement of white light.
The present invention further provides an electronic device, wherein the electronic device is not limited to a television, and may also be a display device such as a computer, and the electronic device includes a backlight module, and the specific structure of the backlight module refers to the above embodiments.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A diffusion membrane, comprising:
the diffusion layer comprises a first side and a second side which are arranged oppositely, the first side is used for being attached to the light emitting side of the diffusion plate, a plurality of first convex parts are convexly arranged on the second side of the diffusion layer, and each first convex part comprises a first surface which is arranged opposite to the second side and a plurality of second surfaces which are arranged along the direction far away from the second side and gradually incline inwards; and the number of the first and second groups,
the light-gathering layer is arranged on the second side and is attached to the diffusion layer, a plurality of grooves are concavely formed in one side, close to the diffusion layer, of the light-gathering layer, each groove is used for being embedded into the corresponding first convex portion, a plurality of second convex portions are convexly arranged on one side, far away from the diffusion layer, of the light-gathering layer, and each second convex portion is arranged in a gradually-reduced mode along the direction far away from the diffusion layer;
wherein the refractive index of the diffusion layer is greater than the refractive index of the light-condensing layer.
2. The diffusion film according to claim 1, wherein at least two of the second protrusions are not equal in height in a direction away from the diffusion layer.
3. The diffusion film according to claim 2, wherein in adjacent two of the second convex portions, one of the second convex portions has a height a in a direction away from the diffusion layer, and the other of the second convex portions has a height B in a direction away from the diffusion layer, where a > B.
4. The diffuser film of claim 1, wherein the second protrusions comprise a plurality of third surfaces that are inclined inwardly in a direction away from the diffuser layer, and wherein the included angle between each of the third surfaces and the light collector layer is the same.
5. The diffusion film of claim 4, wherein an angle between each of the third surfaces and the light-condensing layer is C, and the refractive index of the second convex portion is n 1 ；
Wherein, C ═ arcsin (1/n) 2 )*180/3.1415926。
6. The diffuser film of claim 1, wherein each of said second faces has an included angle D with said second side, and wherein said light concentrating layer has a refractive index n 2 The refractive index of the first convex part is n 3 ；
Wherein D ═ arcsin (n) 2 /n 3 )*180/3.1415926。
7. A diffuser plate, comprising:
the light source comprises a body part and a light source body, wherein the body part comprises a light inlet side and a light outlet side which are oppositely arranged; and the number of the first and second groups,
a diffuser film provided on a light exit side of the body portion, the diffuser film comprising the diffuser film according to any one of claims 1 to 6.
8. The diffuser plate as in claim 7, the body portion comprising a first substrate disposed on a first side of the diffuser film, a second substrate disposed on a side of the first substrate facing away from the diffuser film, and a color conversion layer disposed between the first substrate and the second substrate, the color conversion layer encapsulating the quantum dots therein.
9. A backlight module, comprising:
a light source; and the number of the first and second groups,
a diffuser plate disposed on a light exit side of the light source, the diffuser plate comprising the diffuser plate of any one of claims 7 to 8.
10. An electronic device comprising the backlight module of claim 9.
CN202210638305.XA 2022-06-07 2022-06-07 Diffusion film, diffusion plate, backlight module and electronic equipment Pending CN114815023A (en)

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CN101639585A (en) * 2009-09-09 2010-02-03 友达光电股份有限公司 Composite optical film
WO2016049960A1 (en) * 2014-09-30 2016-04-07 深圳市华星光电技术有限公司 Liquid crystal display device
CN208999593U (en) * 2018-09-26 2019-06-18 张家港康得新光电材料有限公司 A kind of composite membrane
CN113703226A (en) * 2021-09-08 2021-11-26 广东粤港澳大湾区国家纳米科技创新研究院 High-brightness blue-light-proof quantum dot optical plate, preparation method thereof and backlight module
CN114114487A (en) * 2021-12-09 2022-03-01 常州华威新材料有限公司 Anti-adsorption brightness enhancement film capable of improving brightness and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101191845A (en) * 2006-12-01 2008-06-04 鸿富锦精密工业（深圳）有限公司 Optical plate
CN101158778A (en) * 2007-11-14 2008-04-09 友达光电（苏州）有限公司 Wide vision cornea and LCD device using the same
CN101639585A (en) * 2009-09-09 2010-02-03 友达光电股份有限公司 Composite optical film
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CN208999593U (en) * 2018-09-26 2019-06-18 张家港康得新光电材料有限公司 A kind of composite membrane
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CN114114487A (en) * 2021-12-09 2022-03-01 常州华威新材料有限公司 Anti-adsorption brightness enhancement film capable of improving brightness and preparation method thereof

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