WO2019109448A1 - 扩散板与直下式背光模组 - Google Patents

扩散板与直下式背光模组 Download PDF

Info

Publication number
WO2019109448A1
WO2019109448A1 PCT/CN2018/071410 CN2018071410W WO2019109448A1 WO 2019109448 A1 WO2019109448 A1 WO 2019109448A1 CN 2018071410 W CN2018071410 W CN 2018071410W WO 2019109448 A1 WO2019109448 A1 WO 2019109448A1
Authority
WO
WIPO (PCT)
Prior art keywords
structural layer
groove
ellipsoid
opening
long axis
Prior art date
Application number
PCT/CN2018/071410
Other languages
English (en)
French (fr)
Inventor
付琳琳
何小宇
Original Assignee
惠州市华星光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 惠州市华星光电技术有限公司 filed Critical 惠州市华星光电技术有限公司
Priority to US15/743,019 priority Critical patent/US10613381B2/en
Publication of WO2019109448A1 publication Critical patent/WO2019109448A1/zh

Links

Images

Classifications

    • 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
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • 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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • H01L33/60—Reflective elements

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a diffuser panel and a direct type backlight module.
  • Liquid crystal display has many advantages such as thin body, power saving, no radiation, etc., and is widely used in applications such as mobile phones, personal digital assistants (PDAs), digital cameras, computer screens and notebook computers. Screen, etc.
  • a conventional liquid crystal panel has a color filter substrate, a thin film transistor array substrate (TFT Array Substrate), and a liquid crystal layer disposed between the two substrates.
  • TFT Array Substrate thin film transistor array substrate
  • the working principle is that the rotation of the liquid crystal molecules of the liquid crystal layer is controlled by applying a driving voltage on the two substrates, and the light of the backlight module is refracted to generate a picture. Since the liquid crystal panel itself does not emit light, the light source provided by the backlight module is required to display the image normally. Therefore, the backlight module becomes one of the key components of the liquid crystal display device.
  • the backlight module is divided into a side-in backlight module and a direct-lit backlight module according to different incident positions of the light source.
  • a light source for example, a cathode fluorescent lamp (CCFL) or a light emitting diode (LED)
  • CCFL cathode fluorescent lamp
  • LED light emitting diode
  • the side-lit backlight module has a backlight LED strip disposed at the edge of the back panel behind the liquid crystal panel, and the light emitted by the LED strip is from the side of the light guide plate (LGP).
  • the light surface enters the light guide plate, is reflected and diffused, and is emitted from the light exit surface of the light guide plate, and then passes through the optical film group to form a surface light source to be supplied to the liquid crystal panel.
  • the side-in type backlight module can realize the thinning of the TV by reducing the size of the LED (light-emitting diode), the thickness of the light guide plate, the thickness of the diaphragm, or adopting a full fit, thereby rapidly occupying the market of the ultra-thin TV field.
  • the price of the light guide plate in the side-entry backlight module is relatively high, and the number of LEDs used is relatively large, although it is relatively easy to achieve thinning, there is always no cost advantage, and it cannot be at the low end.
  • the direct-type backlight module of the same size has obvious price advantage due to the lower price of the diffuser plate and the relatively small number of LEDs, but due to design limitations, the diffusion plate and the LED The closer the distance is, the more likely it is to have a light-shadow problem (LED mura), which causes poor taste. If the direct-lit backlight module wants to pass the taste, it is necessary to ensure a sufficient distance between the diffuser and the reflector.
  • FIG. 1 shows the principle of the light shadow problem in the direct type backlight module
  • FIG. 2 is a schematic view of the light shadow phenomenon appearing on the light emitting surface of the direct type backlight module.
  • the light shadow problem is generated by the fact that due to the limited illumination angle of the LED lamp 610, the non-light-emitting dark area between the adjacent LED lamps 610 and the light-emitting area of the nearby LED lamp 610 form a bright and dark uneven picture.
  • the diffusion plate 500 and the optical film 800 After the light passes through the diffusion plate 500 and the optical film 800, the diffusion plate 500 and the optical film 800 have a certain diffusion effect on the light, but it is not enough to change the problem of uneven brightness and light, and the problem of the lamp shadow is generated.
  • the method for solving the problem of lamp shadow is to reduce the LED pitch or increase the OD value. Both methods have drawbacks.
  • the first method needs to increase the number of LED lamps 610, thereby increasing the cost of the backlight module, and the second method. It is not conducive to the realization of ultra-thin design and affects the appearance of TV. Therefore, there is an urgent need in the industry for a method for solving the problem of lamp shadow without increasing the number of LED lamps 610 without increasing the OD value, so as to realize the low cost of the direct-lit backlight module.
  • the ultra-thin design in order to achieve the thin and light design of the TV machine.
  • the object of the present invention is to provide a direct type backlight module, which comprises the above diffusion plate, which can solve the problem of lamp shadow while reducing the number of LED lamps and reducing the light mixing distance, thereby realizing the low cost of the direct type backlight module. With ultra-thin design.
  • the present invention provides a diffusing plate comprising a first structural layer, a second structural layer, and a third structural layer disposed in order from top to bottom; wherein the third structural layer is away from the second structural layer One side is the light entering side;
  • the refractive index of the first structural layer is n 1
  • the refractive index of the second structural layer is n 2
  • the refractive index of the third structural layer is n 3 , then n 1 ⁇ n 2 ⁇ n 3 ;
  • the first structural layer is tightly coupled to the contact surface of the second structural layer; the second structural layer is intimately coupled to the contact surface of the third structural layer;
  • a surface of the second structural layer that is in contact with the third structural layer has a plurality of first grooves
  • a surface of the third structural layer that is in contact with the second structural layer has a plurality of first convex portions.
  • the shapes and sizes of the plurality of first protrusions respectively match the shape and size of the plurality of first grooves.
  • the hollowed out portion of the first groove is a part of an ellipsoid, specifically less than or equal to one-half of an ellipsoid, and the ellipsoid is a geometric body surrounded by an ellipse rotating around its long axis, the ellipsoid
  • the long axis of the sphere is parallel to the second structural layer;
  • the opening of the first groove is elliptical, the length of the long axis defining the opening of the first groove is d1, and the distance from the lowest point of the first groove to the opening is h1, then h1 ⁇ d1 .
  • the hollowed out portion of the first groove is one-half of the ellipsoid.
  • the first groove has a curved surface coefficient of 0.4 to 0.7, and the refractive indexes n 1 , n 2 , and n 3 satisfy the following relationship: n 3 /n 2 ⁇ 1.3, n 2 /n 1 ⁇ 1.3.
  • the surface of the second structural layer that is in contact with the first structural layer has a plurality of second grooves, and the surface of the first structural layer that is in contact with the second structural layer has a plurality of second convex portions.
  • the shapes and sizes of the plurality of second protrusions respectively match the shapes and sizes of the plurality of second grooves.
  • the hollowed out portion of the second groove is a part of an ellipsoid, specifically less than or equal to one-half of an ellipsoid, and the ellipsoid is a geometric body surrounded by an ellipse rotating around its long axis, the ellipsoid
  • the long axis of the sphere is parallel to the second structural layer;
  • the opening of the second groove is elliptical, the length of the long axis defining the opening of the second groove is d2, and the distance from the lowest point of the second groove to the opening is h2, then h2 ⁇ d2 .
  • a surface of the second structural layer that is in contact with the first structural layer has a plurality of third convex portions, and a surface of the first structural layer that is in contact with the second structural layer has a plurality of third recesses.
  • the shape and size of the plurality of third protrusions respectively match the shape and size of the plurality of third grooves.
  • the hollowed out portion of the third groove is a part of an ellipsoid, specifically less than or equal to one-half of an ellipsoid, and the ellipsoid is a geometric body surrounded by an ellipse rotating around its long axis, the ellipsoid
  • the long axis of the sphere is parallel to the first structural layer;
  • the opening of the third groove is elliptical, the length of the long axis defining the opening of the third groove is d3, and the distance from the lowest point of the third groove to the opening is h3, then h3 ⁇ d3 .
  • the present invention also provides a direct type backlight module, comprising a light source, the diffusion plate disposed on a light exiting side of the light source; and a third structural layer of the diffusion plate disposed toward the light source.
  • the light source includes a plurality of LED lamps arranged at intervals; the direct-lit backlight module further includes: a reflective sheet disposed on a side of the light source away from the diffusing plate, and disposed on a side of the diffusing plate away from the light source Optical film.
  • the present invention also provides a diffusing plate comprising a first structural layer, a second structural layer, and a third structural layer disposed in order from top to bottom; a side of the third structural layer remote from the second structural layer is Light entering side;
  • the first structural layer has a refractive index n 1
  • the second structural layer has a refractive index n 2
  • the third structural layer has a refractive index n 3 , then n 1 ⁇ n 2 ⁇ n 3 ;
  • the first structural layer is tightly coupled to the contact surface of the second structural layer; the second structural layer is intimately coupled to the contact surface of the third structural layer;
  • a surface of the second structural layer that is in contact with the third structural layer has a plurality of first grooves
  • a surface of the third structural layer that is in contact with the second structural layer has a plurality of first convex portions.
  • the shape and size of the plurality of first protrusions respectively match the shape and size of the plurality of first grooves;
  • the hollowed out portion of the first groove is a part of an ellipsoid, specifically less than or equal to one-half of an ellipsoid, and the ellipsoid is a geometric body surrounded by an ellipse rotating around its long axis.
  • the long axis of the ellipsoid is parallel to the second structural layer;
  • the opening of the first groove is elliptical, the length of the long axis defining the opening of the first groove is d1, and the distance from the lowest point of the first groove to the opening is h1, then h1 ⁇ d1 ;
  • hollowed out portion of the first groove is one-half of an ellipsoid
  • the surface of the second structural layer that is in contact with the first structural layer has a plurality of second grooves
  • the surface of the first structural layer that is in contact with the second structural layer has a plurality of second raised portions
  • the shape and size of the plurality of second protrusions respectively match the shape and size of the plurality of second grooves
  • the hollowed out portion of the second groove is a part of an ellipsoid, specifically less than or equal to one-half of an ellipsoid, and the ellipsoid is a geometric body surrounded by an ellipse rotating around its long axis.
  • the long axis of the ellipsoid is parallel to the second structural layer;
  • the opening of the second groove is elliptical, the length of the long axis defining the opening of the second groove is d2, and the distance from the lowest point of the second groove to the opening is h2, then h2 ⁇ d2 .
  • the present invention provides a diffusing plate and a direct type backlight module.
  • the diffusing plate of the present invention is provided with a first groove on the light incident side of the second structural layer, a second groove or a third convex portion on the light emitting side of the second structural layer, and a first structural layer and a second layer are disposed.
  • the refractive indices of the structural layer and the third structural layer are sequentially increased, and the divergence angle of the incident light can be significantly increased, thereby achieving uniform brightness of the backlight.
  • the direct type backlight module of the present invention comprises the above-mentioned diffusing plate, and since the diffusing plate has an excellent effect of diffusing light, it is possible to solve the problem of the lamp shadow while reducing the number of LED lights and reducing the light mixing distance, thereby realizing the direct type.
  • the low-cost and ultra-thin design of the backlight module is beneficial to the use of the direct-lit backlight module in the ultra-thin TV field.
  • FIG. 1 is a schematic diagram showing a principle of generating a lamp shadow problem in a direct type backlight module
  • FIG. 2 is a schematic view showing a phenomenon of light shadow on a light-emitting surface of a direct-lit backlight module
  • Figure 3 is a cross-sectional view showing a first embodiment of the diffusing plate of the present invention.
  • Figure 4 is an exploded perspective view showing a first embodiment of the diffusion plate of the present invention.
  • 5A is a schematic cross-sectional view showing a second structural layer in the first embodiment of the diffusing plate of the present invention.
  • 5B is a bottom view showing a second structural layer in the first embodiment of the diffusing plate of the present invention.
  • 5C is a schematic plan view of a second structural layer in the first embodiment of the diffusing plate of the present invention.
  • 6A is a schematic view showing a diffusion effect of a first groove in a second structural layer on incident light
  • 6B is a schematic view showing a diffusion effect of a second groove in the second structural layer on incident light
  • Figure 7 is a schematic view of the focus of the ellipse and the corresponding positions of the major axis and the minor axis;
  • 8A is a schematic view showing a diffusion effect of light rays entering the second structural layer from the first groove when the surface coefficient is 0.9;
  • 8B is a schematic diagram showing the diffusion effect of light rays entering the second structural layer from the first groove when the surface coefficient is 0.7;
  • FIG. 8C is a schematic diagram showing the diffusion effect of the light entering the second structural layer from the first groove when the surface coefficient is 0.4;
  • Figure 9 is a cross-sectional view showing a second embodiment of the diffusing plate of the present invention.
  • Figure 10 is an exploded perspective view showing a second embodiment of the diffusion plate of the present invention.
  • Figure 11A is a cross-sectional view showing the first structural layer in the second embodiment of the diffusing plate of the present invention.
  • 11B is a bottom view of the first structural layer in the second embodiment of the diffusing plate of the present invention.
  • FIG. 12 is a schematic structural view of a direct type backlight module of the present invention.
  • a first embodiment of the diffusion plate 50 of the present invention includes the first structural layer 10, the second structural layer 20, and the third structural layer disposed in order from top to bottom. 30; a side of the third structural layer 30 away from the second structural layer 20 is a light incident side;
  • the refractive index of the first structural layer 10 is n 1
  • the refractive index of the second structural layer 20 is n 2
  • the refractive index of the third structural layer 30 is n 3 , then n 1 ⁇ n 2 ⁇ n 3 ;
  • the first structural layer 10 is tightly coupled to the contact surface of the second structural layer 20; the second structural layer 20 is tightly coupled to the contact surface of the third structural layer 30;
  • the surface of the second structural layer 20 that is in contact with the third structural layer 30 has a plurality of first grooves 21, and the surface of the third structural layer 30 that is in contact with the second structural layer 20 has a plurality of first surfaces.
  • the shape and size of the plurality of first protrusions 31 coincide with the shape and size of the plurality of first grooves 21, respectively.
  • the hollowed out portion of the first groove 21 is a part of an ellipsoid, specifically less than or equal to one-half of an ellipsoid, and the ellipsoid is an ellipse rotating around its long axis. a geometry enclosed in a week, the long axis of the ellipsoid is parallel to the second structural layer 20;
  • the opening of the first groove 21 is elliptical, and the length of the long axis defining the opening of the first groove 21 is d1, and the distance from the lowest point of the first groove 21 to the opening is h1. H1 ⁇ d1.
  • the hollowed out portion of the first groove 21 is one-half of an ellipsoid.
  • the plurality of first grooves 21 are arranged in an array on the second structural layer 20 .
  • the plurality of first grooves 21 have the same shape and size.
  • the surface of the second structural layer 20 that is in contact with the first structural layer 10 has a plurality of second grooves 22, and the surface of the first structural layer 10 that is in contact with the second structural layer 20 has a number
  • the second protrusions 12 are shaped and sized to match the shape and size of the plurality of second grooves 22, respectively.
  • the hollowed out portion of the second groove 22 is a part of an ellipsoid, specifically less than or equal to one-half of an ellipsoid, and the ellipsoid is an ellipse rotating around its long axis. a geometry enclosed in a week, the long axis of the ellipsoid is parallel to the second structural layer 20;
  • the opening of the second groove 22 is elliptical, the length of the long axis defining the opening of the second groove 22 is d2, and the distance from the lowest point of the second groove 22 to the opening is h2. H2 ⁇ d2.
  • the hollowed out portion of the second groove 22 is one-half of an ellipsoid.
  • the plurality of second grooves 22 are respectively disposed corresponding to the plurality of first grooves 21 .
  • the second groove 22 has the same shape and size as the first groove 21.
  • FIG. 6A is a schematic view showing a diffusion effect of the first groove 21 in the second structural layer 20 on the incident light
  • FIG. 6B is a schematic view showing the diffusion effect of the second groove 22 in the second structural layer 20 on the incident light
  • the incident light diffusing effect exhibited by 6B is obtained by lightools simulation.
  • the incident light rays are respectively diffused once through the first groove 21 and the second groove 22, and are incident after two times of diffusion.
  • the divergence angle of the light is significantly increased to make the backlight brightness uniform.
  • the direction of transmission does not change; in the case of n 1 ⁇ n 2 ⁇ n 3 , as shown by the solid line in FIG. 3 , the transmission direction of the incident ray has an angle between the exit direction and the incident direction after two changes.
  • ⁇ that is to say, the divergence angle of the incident light is increased by ⁇ , thereby effectively increasing the divergence angle of the incident light, and the brightness of the backlight can be made uniform, thereby avoiding the problem of lamp shadow.
  • the inventors conducted the following simulation test to obtain an optimum design parameter, in which the light is entered by the first groove 21 when the surface coefficient is three values. Diffusion effect experiment after the second structural layer 20:
  • the ellipsoid in which the first groove 21 is located is a geometry surrounded by an ellipse rotating around its long axis.
  • the larger the surface factor the more flat the shape of the ellipse.
  • one half of the long axis defining the opening of the first groove 21 is a semi-major axis, and the distance from the lowest point of the first groove 21 to the opening is a half-width axis.
  • FIG. 8A is a schematic view showing the diffusion effect of the light entering the second structural layer 20 from the first groove 21 when the surface coefficient is 0.9, as shown in FIG. 8A, the semi-major axis/half-width axis is 2.5, and the surface coefficient is 0.9.
  • the surface coefficient is 0.9
  • about one-third of the light entering the second structural layer 20 from the first groove 21 is refracted, and two-thirds of the light is totally reflected, that is, most of the incident light is Reflected back into the third structural layer 30, so the diffusion effect is not good;
  • FIG. 8B is a schematic view showing the diffusion effect of the light entering the second structural layer 20 from the first groove 21 when the surface coefficient is 0.7, as shown in FIG. 8B, the semi-major axis/half-width axis is 2, and the surface coefficient is 0.7.
  • the surface coefficient is 0.7
  • about two-thirds of the light entering the second structural layer 20 from the first groove 21 is refracted, and one-third is totally reflected, that is, most of the incident light can When incident into the second structural layer 20, the diffusion effect is better;
  • FIG. 8C is a schematic view showing the diffusion effect of the light entering the second structural layer 20 from the first groove 21 when the surface coefficient is 0.4, as shown in FIG. 8C, the semi-major axis/half-width axis is 1.5, and the surface coefficient is 0.4.
  • the surface coefficient is 0.4
  • the light entering the second structural layer 20 from the first groove 21 hardly undergoes total reflection, that is, the incident light is almost entirely incident on the second structural layer 20, and the diffusion effect is the most. good.
  • the present invention selects the surface coefficient of the first groove 21 to be 0.4 to 0.7, and the reflectance of the incident light is low, the diffusion effect is better, and the surface is better in the surface coefficient range.
  • the coefficient range is matched with the refractive index parameter setting of n 3 /n 2 ⁇ 1.3 and n 2 /n 1 ⁇ 1.3 to achieve an optimum light diffusion effect.
  • the surface coefficient of the second groove 22 is also set to 0.4 to 0.7.
  • the diffusion plate 50 of the first embodiment described above is formed by first melting the material of the second structural layer 20, and then forming the molten material of the second structural layer 20 into a film, and the surface has a convex surface before the film is cured.
  • the hot pressing mold is rolled from both sides of the film to obtain a second structural layer 20 having a first groove 21 and a second groove 22 on both sides, and then the material of the first structural layer 10 and the third structural layer 30 are formed.
  • the materials are respectively melted, and the molten material of the first structural layer 10 and the molten material of the third structural layer 30 are respectively applied to the surface of the second structural layer 20 to form a film in an arbitrary order, and are respectively cooled and solidified to obtain a first
  • the structural layer 10 and the third structural layer 30 are used to produce the diffusion plate 50.
  • the microstructures of the upper and lower surfaces of the second structural layer 20 are all groove structures, when the molten material film of the second structural layer 20 is rolled by a hot pressing die, the groove structure
  • the shape of the diffusion plate 50 is low, the process conditions (such as temperature) of the diffusion plate 50 are required to be low, the process difficulty is low, and the high production yield can be ensured; and the hot pressing die which is convex is easy to be produced. The cost is lower.
  • a second embodiment of the diffusion plate 50 of the present invention the microstructures on the contact surface of the first structural layer 10 and the second structural layer 20 in the second embodiment and the first The microstructure of the contact surface of the first structural layer 10 and the second structural layer 20 in an embodiment is different.
  • the surface of the second structural layer 20 that is in contact with the first structural layer 10 There are a plurality of third protrusions 23, and the surface of the first structure layer 10 that is in contact with the second structure layer 20 has a plurality of third grooves 13, and the shapes of the plurality of third protrusions 23 are The dimensions respectively match the shape and size of the plurality of third grooves 13.
  • the hollowed out portion of the third groove 13 is a part of an ellipsoid, specifically less than or equal to one-half of an ellipsoid, and the ellipsoid is an ellipse rotating around its long axis. a geometry enclosed in a week, the long axis of the ellipsoid is parallel to the first structural layer 10;
  • the opening of the third groove 13 is elliptical, the length of the long axis defining the opening of the third groove 13 is d3, and the distance from the lowest point of the third groove 13 to the opening is h3. H3 ⁇ d3.
  • the hollowed out portion of the third groove 13 is one-half of an ellipsoid.
  • the plurality of third grooves 13 are respectively disposed corresponding to the plurality of first grooves 21 .
  • the third groove 13 has the same shape and size as the first groove 21.
  • the surface coefficient of the third groove 13 is set to be 0.4 to 0.7.
  • the diffusion effect of the diffusion plate 50 of the second embodiment is superior to that of the diffusion plate 50 of the first embodiment described above, but compared with the diffusion plate 50 of the first embodiment, the second The difficulty in fabricating the second structural layer 20 in the diffusion plate 50 of the embodiment is increased.
  • the diffusion plate 50 is provided with a first groove 21 on the light incident side of the second structure layer 20, a second groove 22 or a third protrusion 23 on the light exit side of the second structure layer 20, and the first structure is disposed.
  • the refractive indices of the layer 10, the second structural layer 20, and the third structural layer 30 are sequentially increased, which can significantly increase the divergence angle of the incident light, thereby achieving uniform brightness of the backlight, when the diffusion plate 50 is applied to the direct-lit backlight module.
  • the lamp shadow problem can be solved by reducing the number of LED lights and reducing the light mixing distance, thereby realizing the low cost and ultra-thin design of the direct type backlight module.
  • the present invention further provides a direct-lit backlight module, comprising a light source 60, and the diffusing plate 50 disposed on the light-emitting side of the light source 60;
  • the third structural layer 30 in the diffuser plate 50 is disposed toward the light source 60.
  • the light source 60 includes a plurality of LED lamps 61 arranged at intervals.
  • the direct type backlight module further includes a reflection sheet 70 disposed on a side of the light source 60 away from the diffusion plate 50, and configured to emit a portion of the light emitted from the light source 60 in a direction away from the diffusion plate 50. Reflection is performed to increase the light utilization efficiency of the backlight 60.
  • the direct type backlight module further includes an optical film 80 disposed on a side of the diffusion plate 50 away from the light source 60, and the optical film 80 may be a film such as a brightness enhancement film.
  • the direct type backlight module includes the diffusing plate 50. Since the diffusing plate 50 has an excellent effect of diffusing light, the lamp shadow problem can be solved by reducing the number of the LED lamps 61 and reducing the light mixing distance.
  • the low-cost and ultra-thin design of the backlight module is beneficial to realize the use of the direct-lit backlight module in the ultra-thin TV field.
  • the present invention provides a diffuser panel and a direct type backlight module.
  • the diffusing plate of the present invention is provided with a first groove on the light incident side of the second structural layer, a second groove or a third convex portion on the light emitting side of the second structural layer, and a first structural layer and a second layer are disposed.
  • the refractive indices of the structural layer and the third structural layer are sequentially increased, and the divergence angle of the incident light can be significantly increased, thereby achieving uniform brightness of the backlight.
  • the direct type backlight module of the present invention comprises the above-mentioned diffusing plate, and since the diffusing plate has an excellent effect of diffusing light, it is possible to solve the problem of the lamp shadow while reducing the number of LED lights and reducing the light mixing distance, thereby realizing the direct type.
  • the low-cost and ultra-thin design of the backlight module is beneficial to the use of the direct-lit backlight module in the ultra-thin TV field.

Landscapes

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

Abstract

一种扩散板（50）与直下式背光模组，扩散板（50）通过在第二结构层（20）的入光侧设置第一凹槽（21），在第二结构层（20）的出光侧设置第二凹槽（22）或者第三凸起部（23），并设置第一结构层（10）、第二结构层（20）、第三结构层（23）的折射率依次增大，能够显著提高入射光线的发散角，实现背光亮度均匀化。直下式背光模组含有扩散板（50），由于扩散板（50）对光线的扩散效果极佳，因此能够在减少LED灯的颗数并且缩小混光距离的情况下解决灯影问题，从而实现直下式背光模组的低成本与超薄化设计，有利于实现直下式背光模组在超薄TV领域的使用。

Description

扩散板与直下式背光模组 技术领域
本发明涉及显示技术领域，尤其涉及一种扩散板与直下式背光模组。
背景技术
液晶显示装置(Liquid Crystal Display，LCD)具有机身薄、省电、无辐射等众多优点，得到了广泛的应用，如：移动电话、个人数字助理(PDA)、数字相机、计算机屏幕和笔记本电脑屏幕等。
现有市场上的液晶显示装置大部分为背光型液晶显示装置，其包括壳体、设于壳体内的液晶面板及设于壳体内的背光模组(Backlight module)。传统的液晶面板的结构是由一彩色滤光片(Color Filter)基板、一薄膜晶体管阵列基板(Thin Film Transistor Array Substrate，TFT Array Substrate)以及一配置于两基板间的液晶层(Liquid Crystal Layer)所构成，其工作原理是通过在两片基板上施加驱动电压来控制液晶层的液晶分子的旋转，将背光模组的光线折射出来产生画面。由于液晶面板本身不发光，需要借由背光模组提供的光源来正常显示影像，因此，背光模组成为液晶显示装置的关键组件之一。背光模组依照光源入射位置的不同分成侧入式背光模组与直下式背光模组。直下式背光模组是将发光光源(例如阴极萤光灯管(Cold Cathode Fluorescent Lamp，CCFL)或发光二极管(Light Emitting Diode，LED))设置在液晶面板后方，直接形成面光源提供给液晶面板。而侧入式背光模组是将背光源LED灯条(Light bar)设于液晶面板侧后方的背板边缘处，LED灯条发出的光线从导光板(Light Guide Plate，LGP)一侧的入光面进入导光板，经反射和扩散后从导光板出光面射出，再经由光学膜片组，以形成面光源提供给液晶面板。
随着消费者对电视(TV)、笔记本电脑(Notebook)等电子显示产品的外观要求越来越高，TV整机的轻薄化设计与窄边框设计越来越受到消费者的重视。目前，侧入式背光模组可以通过减小LED(发光二极管)尺寸、导光板厚度、膜片厚度或者采用全贴合等方式来实现TV薄型化，因而迅速占领了超薄TV领域的市场。然而，由于侧入式背光模组中导光板的价格相对较高，且使用的LED颗数相对较多，使得其虽然较易达成薄型化，但却始终没有成本上的优势，不能在低端消费人群中有广泛的市场。相较于侧入式背光模组而言，相同尺寸的直下式背光模组由于扩散板的价格较低、 LED颗数相对较少而拥有明显的价格优势，但由于设计限制，扩散板与LED的距离越近，越容易产生灯影问题(LED mura)，造成品味不良，直下式背光模组若想在品味上过关，则需要保证扩散板与反射片之间有足够的混光距离(optical distance，OD)或者通过增加LED颗数来防止灯影问题的出现，然而，增大OD值会产生较大的厚度，导致直下式背光模组无法在超薄TV领域得到市场，而增加LED颗数则会增加成本，削弱直下式背光模组在成本上的优势。
图1展示了直下式背光模组中灯影问题产生的原理，图2为直下式背光模组的出光面出现灯影现象的示意图。如图1所示，灯影问题产生的原理是：由于LED灯610的发光角度有限，相邻LED灯610之间的不发光暗区与附近的LED灯610的发光区形成亮暗不均的画面，光线经过扩散板500与光学膜片800后，扩散板500与光学膜片800虽然对光线有一定扩散作用，但不足以改变此亮暗不均问题，灯影问题由此产生。目前解决灯影问题的方法为减小LED间距或增大OD值，这两种方法均有弊端，第一种方法需要增加LED灯610的颗数，从而增加了背光模组成本，第二种方法不利于实现超薄设计，影响TV外观，因此业界迫切需要一种在不增加LED灯610的颗数且不增加OD值的情况下解决灯影问题的方法，以实现直下式背光模组的低成本与超薄化设计，进而实现TV整机的轻薄化设计。
发明内容
本发明的目的在于提供一种扩散板，能够显著提高入射光线的发散角，实现背光亮度均匀化。
本发明的目的还在于提供一种直下式背光模组，含有上述扩散板，能够在减少LED灯的颗数并且缩小混光距离的情况下解决灯影问题，从而实现直下式背光模组的低成本与超薄化设计。
为实现上述目的，本发明提供一种扩散板，包括从上至下依次设置的第一结构层、第二结构层、第三结构层；所述第三结构层上远离所述第二结构层的一侧为入光侧；
定义所述第一结构层的折射率为n 1，所述第二结构层的折射率为n 2，所述第三结构层的折射率为n 3，则n 1＜n 2＜n 3；
所述第一结构层与第二结构层的接触面紧密结合；所述第二结构层与第三结构层的接触面紧密结合；
所述第二结构层上与第三结构层相接触的表面具有数个第一凹槽，所述第三结构层上与第二结构层相接触的表面具有数个第一凸起部，所述数 个第一凸起部的形状和尺寸分别与所述数个第一凹槽的形状和尺寸相吻合。
所述第一凹槽的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第二结构层；
所述第一凹槽的开口为椭圆形，定义所述第一凹槽的开口的长轴的长度为d1，所述第一凹槽的最低点至开口处的距离为h1，则h1＜d1。
所述第一凹槽的挖空部分为椭球体的二分之一。
所述第一凹槽的曲面系数为0.4～0.7，所述折射率n 1、n 2、n 3满足以下关系：n 3/n 2<1.3，n 2/n 1<1.3。
所述第二结构层上与第一结构层相接触的表面具有数个第二凹槽，所述第一结构层上与第二结构层相接触的表面具有数个第二凸起部，所述数个第二凸起部的形状和尺寸分别与所述数个第二凹槽的形状和尺寸相吻合。
所述第二凹槽的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第二结构层；
所述第二凹槽的开口为椭圆形，定义所述第二凹槽的开口的长轴的长度为d2，所述第二凹槽的最低点至开口处的距离为h2，则h2＜d2。
所述第二结构层上与第一结构层相接触的表面具有数个第三凸起部，所述第一结构层上与第二结构层相接触的表面具有数个第三凹槽，所述数个第三凸起部的形状和尺寸分别与所述数个第三凹槽的形状和尺寸相吻合。
所述第三凹槽的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第一结构层；
所述第三凹槽的开口为椭圆形，定义所述第三凹槽的开口的长轴的长度为d3，所述第三凹槽的最低点至开口处的距离为h3，则h3＜d3。
本发明还提供一种直下式背光模组，包括光源、设于所述光源出光侧的上述扩散板；所述扩散板中的第三结构层朝向光源设置。
所述光源包括间隔设置的数个LED灯；所述直下式背光模组还包括：设于所述光源远离所述扩散板一侧的反射片、设于所述扩散板远离所述光源一侧的光学膜片。
本发明还提供一种扩散板，包括从上至下依次设置的第一结构层、第二结构层、第三结构层；所述第三结构层上远离所述第二结构层的一侧为入光侧；
定义所述第一结构层的折射率为n 1，所述第二结构层的折射率为n 2， 所述第三结构层的折射率为n 3，则n 1＜n 2＜n 3；
所述第一结构层与第二结构层的接触面紧密结合；所述第二结构层与第三结构层的接触面紧密结合；
所述第二结构层上与第三结构层相接触的表面具有数个第一凹槽，所述第三结构层上与第二结构层相接触的表面具有数个第一凸起部，所述数个第一凸起部的形状和尺寸分别与所述数个第一凹槽的形状和尺寸相吻合；
其中，所述第一凹槽的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第二结构层；
所述第一凹槽的开口为椭圆形，定义所述第一凹槽的开口的长轴的长度为d1，所述第一凹槽的最低点至开口处的距离为h1，则h1＜d1；
其中，所述第一凹槽的挖空部分为椭球体的二分之一；
其中，所述第二结构层上与第一结构层相接触的表面具有数个第二凹槽，所述第一结构层上与第二结构层相接触的表面具有数个第二凸起部，所述数个第二凸起部的形状和尺寸分别与所述数个第二凹槽的形状和尺寸相吻合；
其中，所述第二凹槽的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第二结构层；
所述第二凹槽的开口为椭圆形，定义所述第二凹槽的开口的长轴的长度为d2，所述第二凹槽的最低点至开口处的距离为h2，则h2＜d2。
本发明的有益效果：本发明提供一种扩散板与直下式背光模组。本发明的扩散板通过在第二结构层的入光侧设置第一凹槽，在第二结构层的出光侧设置第二凹槽或者第三凸起部，并设置第一结构层、第二结构层、第三结构层的折射率依次增大，能够显著提高入射光线的发散角，实现背光亮度均匀化。本发明的直下式背光模组含有上述扩散板，由于该扩散板对光线的扩散效果极佳，因此能够在减少LED灯的颗数并且缩小混光距离的情况下解决灯影问题，从而实现直下式背光模组的低成本与超薄化设计，有利于实现直下式背光模组在超薄TV领域的使用。
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其它有益效果显而易见。
附图中，
图1为直下式背光模组中灯影问题的产生原理的示意图；
图2为直下式背光模组的出光面出现灯影现象的示意图；
图3为本发明的扩散板的第一实施例的剖视示意图；
图4为本发明的扩散板的第一实施例的分解示意图；
图5A为本发明的扩散板的第一实施例中的第二结构层的剖视示意图；
图5B为本发明的扩散板的第一实施例中的第二结构层的仰视示意图；
图5C为本发明的扩散板的第一实施例中的第二结构层的俯视示意图；
图6A为第二结构层中的第一凹槽对入射光线的扩散效果示意图；
图6B为第二结构层中的第二凹槽对入射光线的扩散效果示意图；
图7为椭圆的焦点及长轴与短轴的相应位置的示意图；
图8A为曲面系数为0.9时光线由第一凹槽处进入第二结构层后的扩散效果示意图；
图8B为曲面系数为0.7时光线由第一凹槽处进入第二结构层后的扩散效果示意图；
图8C为曲面系数为0.4时光线由第一凹槽处进入第二结构层后的扩散效果示意图；
图9为本发明的扩散板的第二实施例的剖视示意图；
图10为本发明的扩散板的第二实施例的分解示意图；
图11A为本发明的扩散板的第二实施例中的第一结构层的剖视示意图；
图11B为本发明的扩散板的第二实施例中的第一结构层的仰视示意图；
图12为本发明的直下式背光模组的结构示意图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图3至图5C，为本发明的扩散板50的第一实施例，所述扩散板50包括从上至下依次设置的第一结构层10、第二结构层20、第三结构层30；所述第三结构层30上远离所述第二结构层20的一侧为入光侧；
定义所述第一结构层10的折射率为n 1，所述第二结构层20的折射率为n 2，所述第三结构层30的折射率为n 3，则n 1＜n 2＜n 3；
所述第一结构层10与第二结构层20的接触面紧密结合；所述第二结 构层20与第三结构层30的接触面紧密结合；
所述第二结构层20上与第三结构层30相接触的表面具有数个第一凹槽21，所述第三结构层30上与第二结构层20相接触的表面具有数个第一凸起部31，所述数个第一凸起部31的形状和尺寸分别与所述数个第一凹槽21的形状和尺寸相吻合。
如图5A与图5B所示，所述第一凹槽21的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第二结构层20；
所述第一凹槽21的开口为椭圆形，定义所述第一凹槽21的开口的长轴的长度为d1，所述第一凹槽21的最低点至开口处的距离为h1，则h1＜d1。
优选的，所述第一凹槽21的挖空部分为椭球体的二分之一。
具体的，所述数个第一凹槽21在所述第二结构层20上呈阵列排布。
具体的，所述数个第一凹槽21的形状和尺寸相同。
具体的，所述第二结构层20上与第一结构层10相接触的表面具有数个第二凹槽22，所述第一结构层10上与第二结构层20相接触的表面具有数个第二凸起部12，所述数个第二凸起部12的形状和尺寸分别与所述数个第二凹槽22的形状和尺寸相吻合。
如图5A与图5C所示，所述第二凹槽22的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第二结构层20；
所述第二凹槽22的开口为椭圆形，定义所述第二凹槽22的开口的长轴的长度为d2，所述第二凹槽22的最低点至开口处的距离为h2，则h2＜d2。
优选的，所述第二凹槽22的挖空部分为椭球体的二分之一。
具体的，所述数个第二凹槽22分别与所述数个第一凹槽21对应设置。
具体的，所述第二凹槽22的形状和尺寸与所述第一凹槽21相同。
图6A为第二结构层20中的第一凹槽21对入射光线的扩散效果示意图，图6B为第二结构层20中的第二凹槽22对入射光线的扩散效果示意图，图6A与图6B展示的入射光线扩散效果均采用lightools模拟得到，如图6A与图6B所示，入射光线经过第一凹槽21与第二凹槽22时分别进行一次扩散，先后经过两次扩散后，入射光线的发散角显著增大，使背光亮度均匀化。
图3展示了本发明的扩散板50的第一实施例对光线的扩散效果，如图3所示，假设n 1＝n 2＝n 3的情况，如图3中的虚线所示，入射光线的传输方向 没有改变；在n 1＜n 2＜n 3的情况，如图3中的实线所示，入射光线的传输方向经过两次改变后，其出射方向与入射方向之间具有夹角α，也即是说，入射光线的发散角增大α，从而有效提高了入射光线的发散角，能够使背光亮度均匀化，避免产生灯影问题。
为使本发明的扩散板50实现最佳的扩散效果，发明人进行以下模拟试验，以获取最佳设计参数，所述模拟实验为曲面系数为三种数值时光线由第一凹槽21处进入第二结构层20后的扩散效果实验：
已知所述第一凹槽21所在的椭球体为椭圆围绕其长轴旋转一周所围成的几何体，那么，所述椭球体的曲面系数的定义为：曲面系数＝(c/2a) 2，如图7所示，c为椭圆的两个焦F 1、F 2之间的距离，a为椭圆的长轴长度的二分之一，b为椭圆的短轴长度的二分之一。曲面系数越大，椭圆的形状越趋于扁平。
图8A至图8C中，定义所述第一凹槽21的开口的长轴的二分之一为半长轴，所述第一凹槽21的最低点至开口处的距离为半宽轴。
图8A为曲面系数为0.9时光线由第一凹槽21处进入第二结构层20后的扩散效果示意图，如图8A所示，半长轴/半宽轴＝2.5，曲面系数为0.9，在曲面系数为0.9的情况下，由第一凹槽21处进入第二结构层20的光线约有三分之一发生折射，三分之二发生全反射，也即是说，大部分入射光线被反射回第三结构层30中，因此扩散效果不佳；
图8B为曲面系数为0.7时光线由第一凹槽21处进入第二结构层20后的扩散效果示意图，如图8B所示，半长轴/半宽轴＝2，曲面系数为0.7，在曲面系数为0.7的情况下，由第一凹槽21处进入第二结构层20的光线约有三分之二发生折射，三分之一发生全反射，也即是说，大部分入射光线能够入射到第二结构层20中，扩散效果较佳；
图8C为曲面系数为0.4时光线由第一凹槽21处进入第二结构层20后的扩散效果示意图，如图8C所示，半长轴/半宽轴＝1.5，曲面系数为0.4，在曲面系数为0.4的情况下，由第一凹槽21处进入第二结构层20的光线几乎不发生全反射，也即是说，入射光线几乎全部入射到第二结构层20中，扩散效果最佳。
因此，基于以上三种实验结果，本发明选择设置第一凹槽21的曲面系数为0.4～0.7，在该曲面系数范围内，入射光线的反射率较低，扩散效果较佳，并且，该曲面系数范围与n 3/n 2<1.3且n 2/n 1<1.3的折射率参数设置配合能够实现最佳的光线扩散效果。
具体的，为实现最佳扩散效果，所述第二凹槽22的曲面系数同样设置 为0.4～0.7。
上述第一实施例的扩散板50的制作方法为：首先将第二结构层20的材料熔融，然后将所述第二结构层20的熔融材料形成薄膜，在薄膜固化之前采用表面具有凸起的热压模具从薄膜两侧进行滚压，制得两侧分别具有第一凹槽21与第二凹槽22的第二结构层20，之后将第一结构层10的材料与第三结构层30的材料分别熔融，按照任意顺序将所述第一结构层10的熔融材料与所述第三结构层30的熔融材料分别涂覆于第二结构层20表面形成薄膜，冷却固化后分别得到第一结构层10与第三结构层30，从而制得扩散板50。
上述扩散板50的制作方法中，由于第二结构层20的上下表面的微结构均为凹槽结构，因此采用热压模具对第二结构层20的熔融材料薄膜进行滚压时，凹槽结构的形状容易维持，使得所述扩散板50的制程工艺条件(如温度)要求较低，制程难度较低，能够保证较高的生产良率；并且呈为凸起状的热压模具容易制作，成本较低。
请参阅图9至图11B，为本发明的扩散板50的第二实施例，所述第二实施例中的第一结构层10和第二结构层20接触面上的微结构与所述第一实施例中的第一结构层10和第二结构层20接触面上的微结构不同，所述第二实施例中，所述第二结构层20上与第一结构层10相接触的表面具有数个第三凸起部23，所述第一结构层10上与第二结构层20相接触的表面具有数个第三凹槽13，所述数个第三凸起部23的形状和尺寸分别与所述数个第三凹槽13的形状和尺寸相吻合。
如图11A与图11B所示，所述第三凹槽13的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第一结构层10；
所述第三凹槽13的开口为椭圆形，定义所述第三凹槽13的开口的长轴的长度为d3，所述第三凹槽13的最低点至开口处的距离为h3，则h3＜d3。
优选的，所述第三凹槽13的挖空部分为椭球体的二分之一。
具体的，所述数个第三凹槽13分别与所述数个第一凹槽21对应设置。
具体的，所述第三凹槽13的形状和尺寸与所述第一凹槽21相同。
具体的，为实现最佳扩散效果，所述第三凹槽13的曲面系数设置为0.4～0.7。
根据光线模拟实验结果，该第二实施例的扩散板50的扩散效果优于上述第一实施例的扩散板50的扩散效果，但是，与第一实施例的扩散板50 相比，该第二实施例的扩散板50中的第二结构层20的制作难度增加。
上述扩散板50通过在第二结构层20的入光侧设置第一凹槽21，在第二结构层20的出光侧设置第二凹槽22或者第三凸起部23，并设置第一结构层10、第二结构层20、第三结构层30的折射率依次增大，能够显著提高入射光线的发散角，实现背光亮度均匀化，当该扩散板50应用于直下式背光模组中时，能够在减少LED灯的颗数并且缩小混光距离的情况下解决灯影问题，从而实现直下式背光模组的低成本与超薄化设计。
请参阅图12，同时参阅图3至图11B，基于上述扩散板50，本发明还提供一种直下式背光模组，包括光源60、设于所述光源60出光侧的上述扩散板50；所述扩散板50中的第三结构层30朝向光源60设置。
具体的，所述光源60包括间隔设置的数个LED灯61。
具体的，所述直下式背光模组还包括设于所述光源60远离所述扩散板50一侧的反射片70，用于对光源60发出的光线中朝远离扩散板50的方向出射的部分进行反射，提高背光源60的光利用率。
优选的，所述直下式背光模组还包括设于所述扩散板50远离所述光源60一侧的光学膜片80，所述光学膜片80可以为增亮膜等膜片。
上述直下式背光模组含有上述扩散板50，由于该扩散板50对光线的扩散效果极佳，因此能够在减少LED灯61的颗数并且缩小混光距离的情况下解决灯影问题，从而实现直下式背光模组的低成本与超薄化设计，有利于实现直下式背光模组在超薄TV领域的使用。
综上所述，本发明提供一种扩散板与直下式背光模组。本发明的扩散板通过在第二结构层的入光侧设置第一凹槽，在第二结构层的出光侧设置第二凹槽或者第三凸起部，并设置第一结构层、第二结构层、第三结构层的折射率依次增大，能够显著提高入射光线的发散角，实现背光亮度均匀化。本发明的直下式背光模组含有上述扩散板，由于该扩散板对光线的扩散效果极佳，因此能够在减少LED灯的颗数并且缩小混光距离的情况下解决灯影问题，从而实现直下式背光模组的低成本与超薄化设计，有利于实现直下式背光模组在超薄TV领域的使用。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (19)

  1. 一种扩散板，包括从上至下依次设置的第一结构层、第二结构层、第三结构层；所述第三结构层上远离所述第二结构层的一侧为入光侧；
    定义所述第一结构层的折射率为n 1，所述第二结构层的折射率为n 2，所述第三结构层的折射率为n 3，则n 1＜n 2＜n 3；
    所述第一结构层与第二结构层的接触面紧密结合；所述第二结构层与第三结构层的接触面紧密结合；
    所述第二结构层上与第三结构层相接触的表面具有数个第一凹槽，所述第三结构层上与第二结构层相接触的表面具有数个第一凸起部，所述数个第一凸起部的形状和尺寸分别与所述数个第一凹槽的形状和尺寸相吻合。
  2. 如权利要求1所述的扩散板，其中，所述第一凹槽的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第二结构层；
    所述第一凹槽的开口为椭圆形，定义所述第一凹槽的开口的长轴的长度为d1，所述第一凹槽的最低点至开口处的距离为h1，则h1＜d1。
  3. 如权利要求2所述的扩散板，其中，所述第一凹槽的挖空部分为椭球体的二分之一。
  4. 如权利要求2所述的扩散板，其中，所述第一凹槽的曲面系数为0.4～0.7，所述折射率n 1、n 2、n 3满足以下关系：n 3/n 2<1.3，n 2/n 1<1.3。
  5. 如权利要求1所述的扩散板，其中，所述第二结构层上与第一结构层相接触的表面具有数个第二凹槽，所述第一结构层上与第二结构层相接触的表面具有数个第二凸起部，所述数个第二凸起部的形状和尺寸分别与所述数个第二凹槽的形状和尺寸相吻合。
  6. 如权利要求5所述的扩散板，其中，所述第二凹槽的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第二结构层；
    所述第二凹槽的开口为椭圆形，定义所述第二凹槽的开口的长轴的长度为d2，所述第二凹槽的最低点至开口处的距离为h2，则h2＜d2。
  7. 如权利要求1所述的扩散板，其中，所述第二结构层上与第一结构层相接触的表面具有数个第三凸起部，所述第一结构层上与第二结构层相 接触的表面具有数个第三凹槽，所述数个第三凸起部的形状和尺寸分别与所述数个第三凹槽的形状和尺寸相吻合。
  8. 如权利要求7所述的扩散板，其中，所述第三凹槽的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第一结构层；
    所述第三凹槽的开口为椭圆形，定义所述第三凹槽的开口的长轴的长度为d3，所述第三凹槽的最低点至开口处的距离为h3，则h3＜d3。
  9. 一种直下式背光模组，包括光源、设于所述光源出光侧的扩散板；所述扩散板包括从上至下依次设置的第一结构层、第二结构层、第三结构层；所述第三结构层上远离所述第二结构层的一侧为入光侧；
    定义所述第一结构层的折射率为n 1，所述第二结构层的折射率为n 2，所述第三结构层的折射率为n 3，则n 1＜n 2＜n 3；
    所述第一结构层与第二结构层的接触面紧密结合；所述第二结构层与第三结构层的接触面紧密结合；
    所述第二结构层上与第三结构层相接触的表面具有数个第一凹槽，所述第三结构层上与第二结构层相接触的表面具有数个第一凸起部，所述数个第一凸起部的形状和尺寸分别与所述数个第一凹槽的形状和尺寸相吻合；所述扩散板中的第三结构层朝向光源设置。
  10. 如权利要求9所述的直下式背光模组，其中，所述光源包括间隔设置的数个LED灯；所述直下式背光模组还包括：设于所述光源远离所述扩散板一侧的反射片、设于所述扩散板远离所述光源一侧的光学膜片。
  11. 如权利要求9所述的直下式背光模组，其中，所述第一凹槽的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第二结构层；
    所述第一凹槽的开口为椭圆形，定义所述第一凹槽的开口的长轴的长度为d1，所述第一凹槽的最低点至开口处的距离为h1，则h1＜d1。
  12. 如权利要求11所述的直下式背光模组，其中，所述第一凹槽的挖空部分为椭球体的二分之一。
  13. 如权利要求11所述的直下式背光模组，其中，所述第一凹槽的曲面系数为0.4～0.7，所述折射率n 1、n 2、n 3满足以下关系：n 3/n 2<1.3，n 2/n 1<1.3。
  14. 如权利要求9所述的直下式背光模组，其中，所述第二结构层上与第一结构层相接触的表面具有数个第二凹槽，所述第一结构层上与第二 结构层相接触的表面具有数个第二凸起部，所述数个第二凸起部的形状和尺寸分别与所述数个第二凹槽的形状和尺寸相吻合。
  15. 如权利要求14所述的直下式背光模组，其中，所述第二凹槽的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第二结构层；
    所述第二凹槽的开口为椭圆形，定义所述第二凹槽的开口的长轴的长度为d2，所述第二凹槽的最低点至开口处的距离为h2，则h2＜d2。
  16. 如权利要求9所述的直下式背光模组，其中，所述第二结构层上与第一结构层相接触的表面具有数个第三凸起部，所述第一结构层上与第二结构层相接触的表面具有数个第三凹槽，所述数个第三凸起部的形状和尺寸分别与所述数个第三凹槽的形状和尺寸相吻合。
  17. 如权利要求16所述的直下式背光模组，其中，所述第三凹槽的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第一结构层；
    所述第三凹槽的开口为椭圆形，定义所述第三凹槽的开口的长轴的长度为d3，所述第三凹槽的最低点至开口处的距离为h3，则h3＜d3。
  18. 一种扩散板，包括从上至下依次设置的第一结构层、第二结构层、第三结构层；所述第三结构层上远离所述第二结构层的一侧为入光侧；
    定义所述第一结构层的折射率为n 1，所述第二结构层的折射率为n 2，所述第三结构层的折射率为n 3，则n 1＜n 2＜n 3；
    所述第一结构层与第二结构层的接触面紧密结合；所述第二结构层与第三结构层的接触面紧密结合；
    所述第二结构层上与第三结构层相接触的表面具有数个第一凹槽，所述第三结构层上与第二结构层相接触的表面具有数个第一凸起部，所述数个第一凸起部的形状和尺寸分别与所述数个第一凹槽的形状和尺寸相吻合；
    其中，所述第一凹槽的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第二结构层；
    所述第一凹槽的开口为椭圆形，定义所述第一凹槽的开口的长轴的长度为d1，所述第一凹槽的最低点至开口处的距离为h1，则h1＜d1；
    其中，所述第一凹槽的挖空部分为椭球体的二分之一；
    其中，所述第二结构层上与第一结构层相接触的表面具有数个第二凹 槽，所述第一结构层上与第二结构层相接触的表面具有数个第二凸起部，所述数个第二凸起部的形状和尺寸分别与所述数个第二凹槽的形状和尺寸相吻合；
    其中，所述第二凹槽的挖空部分为椭球体的一部分，具体为小于或等于椭球体的二分之一，所述椭球体为椭圆围绕其长轴旋转一周所围成的几何体，所述椭球体的长轴平行于所述第二结构层；
    所述第二凹槽的开口为椭圆形，定义所述第二凹槽的开口的长轴的长度为d2，所述第二凹槽的最低点至开口处的距离为h2，则h2＜d2。
  19. 如权利要求18所述的扩散板，其中，所述第一凹槽的曲面系数为0.4～0.7，所述折射率n 1、n 2、n 3满足以下关系：n 3/n 2<1.3，n 2/n 1<1.3。
PCT/CN2018/071410 2017-12-08 2018-01-04 扩散板与直下式背光模组 WO2019109448A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/743,019 US10613381B2 (en) 2017-12-08 2018-01-04 Diffusion plate and direct-type backlight module

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201711298265.4 2017-12-08
CN201711298265.4A CN108008475A (zh) 2017-12-08 2017-12-08 扩散板与直下式背光模组

Publications (1)

Publication Number Publication Date
WO2019109448A1 true WO2019109448A1 (zh) 2019-06-13

Family

ID=62057556

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/071410 WO2019109448A1 (zh) 2017-12-08 2018-01-04 扩散板与直下式背光模组

Country Status (3)

Country Link
US (1) US10613381B2 (zh)
CN (1) CN108008475A (zh)
WO (1) WO2019109448A1 (zh)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109061945B (zh) * 2018-08-23 2021-09-17 厦门天马微电子有限公司 背光模组和显示装置
TWI679474B (zh) * 2018-10-23 2019-12-11 友達光電股份有限公司 防漏光膜總成及應用該防漏光膜總成的顯示器
CN110231736B (zh) * 2019-05-29 2020-10-16 惠州市华星光电技术有限公司 背光结构和显示面板
CN110941036B (zh) * 2019-12-20 2022-05-03 宁波舜宇奥来技术有限公司 红外光扩散片
CN115128716B (zh) * 2022-05-25 2024-01-02 广东瑞捷新材料股份有限公司 一种新型发泡扩散板结构
TWI814658B (zh) * 2022-12-06 2023-09-01 友達光電股份有限公司 燈板結構

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101191848A (zh) * 2006-12-01 2008-06-04 鸿富锦精密工业（深圳）有限公司 光学板及其制备方法
CN101196584A (zh) * 2006-12-08 2008-06-11 鸿富锦精密工业（深圳）有限公司 光学板
CN101587203A (zh) * 2008-05-23 2009-11-25 鸿富锦精密工业（深圳）有限公司 背光模组及其光学板
KR20100001581A (ko) * 2008-06-27 2010-01-06 동우 화인켐 주식회사 광확산판, 이를 구비한 백라이트 장치 및 액정표시장치
CN202486341U (zh) * 2012-02-03 2012-10-10 苏州拓显光电材料有限公司 扩散板
CN103511913A (zh) * 2012-06-28 2014-01-15 鑫成科技(成都)有限公司 背光模组、液晶显示装置及光源模组

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007121497A (ja) * 2005-10-26 2007-05-17 Toppan Printing Co Ltd レンズシートおよびその製造方法
CN101131440B (zh) * 2006-08-21 2010-07-14 宣茂科技股份有限公司 具扩散及聚光功能的光学膜片结构
WO2010143705A1 (ja) * 2009-06-11 2010-12-16 日本ゼオン株式会社 面光源装置、照明器具及びバックライト装置
CN102798908B (zh) * 2012-07-19 2014-09-10 京东方科技集团股份有限公司 一种扩散板、直下式背光模组及显示装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101191848A (zh) * 2006-12-01 2008-06-04 鸿富锦精密工业（深圳）有限公司 光学板及其制备方法
CN101196584A (zh) * 2006-12-08 2008-06-11 鸿富锦精密工业（深圳）有限公司 光学板
CN101587203A (zh) * 2008-05-23 2009-11-25 鸿富锦精密工业（深圳）有限公司 背光模组及其光学板
KR20100001581A (ko) * 2008-06-27 2010-01-06 동우 화인켐 주식회사 광확산판, 이를 구비한 백라이트 장치 및 액정표시장치
CN202486341U (zh) * 2012-02-03 2012-10-10 苏州拓显光电材料有限公司 扩散板
CN103511913A (zh) * 2012-06-28 2014-01-15 鑫成科技(成都)有限公司 背光模组、液晶显示装置及光源模组

Also Published As

Publication number Publication date
US10613381B2 (en) 2020-04-07
CN108008475A (zh) 2018-05-08
US20190324325A1 (en) 2019-10-24

Similar Documents

Publication Publication Date Title
WO2019109448A1 (zh) 扩散板与直下式背光模组
JP4487629B2 (ja) 面照明装置及びそれを用いた液晶表示装置
US8985798B2 (en) Backlight unit and display apparatus using the same
US7290919B2 (en) Backlight module and brightness enhancement film thereof
US7213933B2 (en) Direct type backlight module of diffuser plate and its manufacturing method thereof
US7199930B2 (en) Light modulation element
US20120134175A1 (en) Planar lighting device and display device having same
CN110196515B (zh) 发光二极管封装件以及包括其的液晶显示装置
JP2007086784A (ja) 光学板、それの製造方法及びそれを有する表示装置
KR101003582B1 (ko) 액정표시소자의 백라이트구조
US10866459B2 (en) Backlight module and display device
WO2012012988A1 (zh) 导光板及背光模组
US20190011789A1 (en) Liquid crystal display panel and manufacturing method thereof
US8827535B2 (en) Backlight module
US7248411B2 (en) Optical film with array of microstructures and the light source apparatus utilizing the same
US8052319B2 (en) Diffusion plate and display apparatus having the same
US20100002467A1 (en) Light Guide Plate and Backlight Module Using the Light Guide Plate
US8049845B2 (en) Optical diffusion device
TWM565324U (zh) Thin planar light source device with light entering directly under the side
US8908130B2 (en) Optical elements, backlight modules, and liquid crystal display employing the same
TWI414836B (zh) 導光板、背光模組及顯示裝置
KR20070117724A (ko) 도광판, 디스플레이 모듈 및 도광판 제작 방법
CN215910676U (zh) 一种含入光孔结构的导光板
KR100965210B1 (ko) 백라이트 유니트용 확산시트
TW200935094A (en) A method of forming light-scattering dots inside the diffusion plate and light guide plate by laser engraving

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18884894

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 25/09/2020)

122 Ep: pct application non-entry in european phase

Ref document number: 18884894

Country of ref document: EP

Kind code of ref document: A1