CN110515241B - Backlight module, display device and manufacturing method - Google Patents

Backlight module, display device and manufacturing method Download PDF

Info

Publication number
CN110515241B
CN110515241B CN201910818838.4A CN201910818838A CN110515241B CN 110515241 B CN110515241 B CN 110515241B CN 201910818838 A CN201910818838 A CN 201910818838A CN 110515241 B CN110515241 B CN 110515241B
Authority
CN
China
Prior art keywords
backlight module
led lamp
microstructure
substrate
lamp beads
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
CN201910818838.4A
Other languages
Chinese (zh)
Other versions
CN110515241A (en
Inventor
林水香
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen Tianma Microelectronics Co Ltd
Original Assignee
Xiamen Tianma Microelectronics Co Ltd
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 Xiamen Tianma Microelectronics Co Ltd filed Critical Xiamen Tianma Microelectronics Co Ltd
Priority to CN201910818838.4A priority Critical patent/CN110515241B/en
Publication of CN110515241A publication Critical patent/CN110515241A/en
Application granted granted Critical
Publication of CN110515241B publication Critical patent/CN110515241B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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

Landscapes

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

Abstract

The embodiment of the invention provides a backlight module, a display device and a manufacturing method, wherein the backlight module comprises: the LED lamp comprises an LED light source, a light source and a light source, wherein the LED light source comprises a substrate and LED lamp beads arranged on the substrate in an array manner; the LED lamp comprises at least one microstructure arranged between two adjacent LED lamp beads, wherein the microstructure comprises a plurality of refraction layers and a plurality of reflection layers which are alternately stacked, and one surface of each reflection layer, which is at least far away from the substrate, is a reflection surface. The backlight module is used for solving the technical problem that the existing backlight module is uneven in brightness.

Description

Backlight module, display device and manufacturing method
Technical Field
The invention relates to the technical field of display, in particular to a backlight module, a display device and a manufacturing method.
Background
In the prior art, because the backlight space of the electronic device is very limited, it is impossible to solve the problem of Light Emitting Diode (LED) shadow by increasing the Light mixing distance, as in the case of a large-size direct-type backlight. In addition, because there is the interval between the LED lamp pearl, and the luminous angle of every LED lamp pearl is comparatively limited for brightness difference appears with other positions of LED lamp pearl between the LED lamp pearl, leads to the mura phenomenon serious.
Therefore, the technical problem of uneven brightness exists in the existing backlight module.
Disclosure of Invention
The embodiment of the invention provides a backlight module, a display device and a manufacturing method, which are used for solving the technical problem that the existing backlight module is uneven in brightness.
In a first aspect, an embodiment of the present invention provides a backlight module, including:
the LED lamp comprises an LED light source, a light source and a light source, wherein the LED light source comprises a substrate and LED lamp beads arranged on the substrate in an array manner;
the LED lamp comprises at least one microstructure arranged between two adjacent LED lamp beads, wherein the microstructure comprises a plurality of refraction layers and a plurality of reflection layers which are alternately stacked, and one surface of each reflection layer, which is at least far away from the substrate, is a reflection surface.
Optionally, the height of the microstructure along a direction perpendicular to the substrate is (h ± 0.2) mm, and h is the height of the LED lamp bead.
Optionally, the maximum length of the microstructure in the direction parallel to the substrate is less than or equal to (L-1) mm, and L is a distance between two adjacent LED lamp beads.
Optionally, the backlight module includes a central region and an edge region surrounding the central region, and a distribution density of the microstructures between two adjacent LED lamp beads in the central region is greater than a distribution density of the microstructures between two adjacent LED lamp beads in the edge region.
Optionally, the microstructure comprises one or more of a pyramid, a cone, a frustum, a truncated cone.
Optionally, the cross-sectional shape of the microstructure on a plane parallel to the substrate includes one or more of a rectangle, a triangle, and a circle.
Optionally, the microstructure includes a first refractive layer and a second refractive layer sequentially stacked along a direction away from the substrate, and a refractive index of the first refractive layer is greater than a refractive index of the second refractive layer.
Optionally, the material of the refraction layer is optical glue.
Optionally, the reflective layer comprises one or both of reflective ink, reflective glue.
In a second aspect, an embodiment of the present invention further provides a display device, including:
the liquid crystal display panel and the backlight module provided by the embodiment of the invention.
In a third aspect, an embodiment of the present invention further provides a method for manufacturing the backlight module, including:
alternately forming a plurality of refraction layers and a plurality of reflection layers of the microstructure by adopting an injection molding mode and a spraying mode;
and the microstructure is arranged between two adjacent LED lamp beads by adopting a spraying mode or a filling mode.
The invention has the following beneficial effects:
the embodiment of the invention provides a backlight module, a display device and a manufacturing method, wherein at least one microstructure is arranged between two adjacent LED lamp beads arranged on a substrate in an array mode, when an LED light source works, light from the LED light source is refracted and reflected by a plurality of refraction layers and a plurality of reflection layers which are alternately stacked and arranged on the microstructure, the light utilization rate between the two adjacent LED lamp beads is improved, and the technical problem of uneven brightness is solved.
Drawings
Fig. 1 is a schematic diagram of an array arrangement structure of LED lamp beads in a backlight module according to an embodiment of the present invention;
fig. 2 is a top view of a backlight module according to an embodiment of the invention;
fig. 3 is a cross-sectional view of a backlight module along MM direction according to an embodiment of the invention;
fig. 4 is a top view of the distribution of microstructures in the center area and the edge area of the backlight module according to the embodiment of the present invention;
fig. 5 is a schematic view illustrating a light ray propagating method in which the microstructure is a prism and includes two refraction layers and two reflection layers according to an embodiment of the present invention;
fig. 6 is a side view of a backlight module according to an embodiment of the present invention, in which the microstructure is a prism and includes three refractive layers and three reflective layers;
fig. 7 is another side view of a backlight module according to an embodiment of the invention;
fig. 8 is a side view of a display device according to an embodiment of the present invention;
fig. 9 is a flowchart illustrating a method for manufacturing a backlight module according to an embodiment of the invention.
Detailed Description
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. Also, the shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the present invention.
In order to better understand the technical solutions of the present invention, the technical solutions of the present invention are described in detail below with reference to the drawings and the specific embodiments, and it should be understood that the specific features in the embodiments and the embodiments of the present invention are detailed descriptions of the technical solutions of the present invention, and are not limitations of the technical solutions of the present invention, and the technical features in the embodiments and the embodiments of the present invention may be combined with each other without conflict. At present, besides the problem that the flat backlight module is easy to have uneven brightness, the curved backlight module still has similar problems. Specifically, in the process of manufacturing the curved backlight module, the bezel is bent to a certain curvature, and the flat lamp panel (i.e. the PCB where the LED light source is located) is forced to be bent and attached to the bezel. Because there is stress resilience in lamp plate itself, also has extrusion resilience with the chase, often can lead to taking place peeling (separation) between the bottom plate of lamp plate and chase because of stress is too big. Therefore, the distance between the LED lamp beads on the lamp panel and the diffusion plate is not uniform, so that the backlight module emits light unevenly, the brightness at different positions is different, and the phenomenon of uneven brightness appears visually.
Referring to fig. 1 to 4, a backlight module according to an embodiment of the present invention includes:
the LED light source 10 comprises a substrate 101 and LED lamp beads 102 arranged on the substrate 101 in an array mode;
in a specific implementation process, as shown in fig. 1, a schematic structural diagram of one of the LED lamp beads 102 arranged on the substrate 101 in an array is shown.
The microstructure 20 comprises a plurality of refraction layers 201 and a plurality of reflection layers 202 which are alternately stacked, wherein at least one surface, far away from the substrate 101, of the reflection layer 202 is a reflection surface.
In a specific implementation, the number of the refractive layers 201 may be two or more, and the number of the corresponding reflective layers 202 may also be two or more. In a specific implementation process, one surface of the reflective layer 202 away from the substrate 101 is a reflective surface, and one surface of the reflective layer 202 close to the substrate 101 is a reflective surface; alternatively, only one surface of the reflective layer 202 remote from the substrate 101 is a reflective surface. Fig. 2 is a top view of the backlight module.
Fig. 3 is a cross-sectional view of the backlight module shown in fig. 2 along MM direction. Specifically, the microstructure 20 shown in fig. 2 and 3 is a triangular pyramid, and each of the plurality of refractive layers 201 in the microstructure 20 includes two refractive layers including a first refractive layer 2011 and a second refractive layer 2012, and each of the plurality of reflective layers 202 includes two reflective layers including a first reflective layer 2021 and a second reflective layer 2022.
In the embodiment of the invention, at least one microstructure 20 is arranged between two adjacent LED lamp beads 102, so that light rays entering between the two adjacent LED lamp beads 102 are refracted for multiple times by the plurality of refraction layers 201 and reflected for multiple times by the plurality of reflection layers 202 and then are emitted from the area in front of the two LED lamp beads 102, the light ray utilization rate is improved, and the light rays are gathered in the area between the two adjacent LED lamp beads 102, so that the brightness of the corresponding area is improved. And the light rays in the area above the center of the microstructure 20 can be concentrated most and then gradually weakened towards the periphery, so that the light rays are more uniformly transited. By adopting the same design concept, at least one microstructure 20 is arranged between any two adjacent LED lamp beads 102 of the backlight module, so that the brightness uniformity of the whole backlight module is correspondingly improved.
In the embodiment of the present invention, the LED light source 10 includes a substrate 101 and LED beads 102 arranged on the substrate 101 in an array, and the size of the LED beads 102 is usually 100 μm to 1000 μm. Since the size of the LED in the order of hundreds of microns does not need to overcome the technical threshold of mass transfer, the mass production of the LED is feasible, and the LED can be applied to the backlight of a large-size display screen (such as a television backlight) and can also be applied to the backlight of a small-size display screen (such as a mobile phone display screen). In a specific implementation process, the substrate 101 may be a Flexible Printed Circuit Board (FPC Board), a resin substrate (bistalimide Triazine (BT Board), or the like. Correspondingly, the backlight module in the embodiment of the invention can be a curved surface backlight module with a certain curvature, and can also be a planar backlight module.
In the embodiment of the invention, the substrate 101 is provided with a trace for realizing external connection of signals and electricity, and the trace is used for transmitting signals for driving the LED lamp beads 102 to emit light. The LED beads 102 may be a plurality of LED beads, and are arranged on the substrate 101 in a predetermined order. For example, the LED beads 102 are spaced by 5mm and arranged in 1000 rows × 1000 columns. Of course, a person skilled in the art can set the number of the LED beads 102 and the arrangement sequence of the LED beads 102 on the substrate 101 according to actual situations, which is not described herein again. In the specific implementation process, LED lamp beads 102 can be arranged through centralized component manufacturing, then, the microstructure 20 is formed through molding technologies such as an injection molding mode or a spraying mode, and then, the microstructure 20 is arranged between two adjacent LED lamp beads through the spraying mode or a filling mode, so that the backlight module is formed.
In the embodiment of the invention, in order to improve the light utilization rate between two adjacent LED lamp beads 102, the height of the microstructure 20 along the direction perpendicular to the substrate 101 is (h ± 0.2) mm, and h is the height of the LED lamp bead 102. In the specific implementation process, the height h of the LED bead 102 ranges from 0.2mm to 2mm, and correspondingly, the height of the microstructure 20 in the direction perpendicular to the substrate 101 may range from 0.1mm to 2.2 mm. For example, when the height of the LED bead 102 is 1mm, the overall height of the microstructure 20 along the direction perpendicular to the substrate 101 is 1.2 mm. In the specific implementation process, in order to weaken the influence of the shadow between two adjacent LED lamp beads 102, the height difference between the height of the microstructure 20 and the height of the LED lamp bead 102 is controlled within a certain numerical range, for example, the heights of the two are approximately equal within a process error range. Because the two adjacent LED lamp beads 102 are basically free of shadows, the brightness uniformity of the area between the two adjacent LED lamp beads 102 is improved, and the brightness uniformity of the whole backlight module is improved based on the same invention concept.
In the embodiment of the present invention, in order to ensure that the microstructure 20 can be sufficiently placed between adjacent LED beads 102, the maximum length of the microstructure 20 along a direction parallel to the substrate 101 is less than or equal to (L-1) mm, where L is a distance between two adjacent LED beads. In a specific implementation process, the distance L between two adjacent LED beads 102 ranges from 1.5mm to 100mm, and correspondingly, the length of the microstructure 20 along a direction parallel to the substrate 101 may range from 0.5mm to 99 mm. For example, when the distance between two adjacent LED beads is 2mm, the length of the microstructure 20 along the direction parallel to the substrate 101 is 0.6 mm.
In the embodiment of the present invention, in order to improve the brightness uniformity of the backlight module, microstructures 20 with different numbers or different sizes may be arranged between the LED beads 102 in different regions. Specifically, the backlight module comprises a central area and an edge area surrounding the central area, wherein the distribution density of the microstructures 20 between two adjacent LED lamp beads 102 in the central area is greater than the distribution density of the microstructures 20 between two adjacent LED lamp beads 102 in the edge area. Fig. 4 shows one of the top views of the distribution of microstructures 20 in the center area a and the edge area B. Generally, the central area of the backlight module corresponds to the display area of the display screen, and the edge area of the backlight module corresponds to the non-display area of the display screen. When the microstructures 20 are of the same size and the same structure, because the amount of light entering the region between every two adjacent LED lamp beads 102 from the LED light source 10 is a predetermined value, after the light is refracted and reflected by one microstructure 20, only a certain proportion of light exits from the region, and when the number of microstructures 20 in the region is increased, the proportion of light exiting from the region is increased, which means that the light exit rate of the region is increased, and the brightness of the region is also increased. Therefore, when the number of the microstructures 20 between the adjacent LED lamp beads in the central area is greater than the number of the microstructures between the adjacent LED lamp beads 102 in the edge area, the brightness of the area between the two LED lamp beads 102 in the central area is brighter and more uniform, and accordingly, the display effect of the display area is better, so that the use efficiency of the backlight module is improved. In addition, when the microstructures 30 are of the same shape, the number of the microstructures is the same, and the sizes of the microstructures are different, the size of the microstructure 20 between two adjacent LED lamp beads 102 in the central region can be controlled to be larger than the size of the microstructure 20 between two adjacent LED lamp beads 102 in the edge region. The larger the size of the microstructure 20 is, the larger the proportion of refraction and reflection of light rays entering between two adjacent LED lamp beads 102 is, so that the emergence rate of the light rays in a corresponding area is improved, and the display effect of a display area is improved while the brightness uniformity of the backlight module is improved.
Of course, those skilled in the art can set the required number of microstructures 20 with the required size in the corresponding region according to the brightness requirement of each region in the backlight module according to the same design concept in the embodiment of the present invention, for example, if the brightness of the edge region of the backlight module needs to be increased, a plurality of microstructures 20 are correspondingly added between two adjacent LED lamp beads in the edge region. The microstructure 20 may be set according to other actual requirements, and is not limited herein.
In the embodiment of the present invention, the microstructure 20 includes a plurality of refractive layers 201 and a plurality of reflective layers 202 alternately stacked, wherein at least one side of the reflective layers 202 away from the substrate 101 is a reflective side. In a specific implementation process, for example, one microstructure 20 is arranged between adjacent LED lamp beads 102, one implementation manner of the microstructure 20 may be that the microstructure 20 is directly formed between the adjacent LED lamp beads 102, specifically, a reflective layer 1 is formed by spraying between the adjacent LED lamp beads 102; then spraying a refraction layer 1 on the reflection layer 1, and then spraying a reflection layer 2 on the refraction layer 1; a refractive layer 2 is then sprayed on the reflective layer 2. Another way to achieve this is to first form the microstructures 20 and then fill the microstructures 20 between adjacent LED beads 102. In this case, the microstructure 20 may be formed by injection molding the refraction layer 3 and the refraction layer 4, spraying the reflection layer on the upper and lower surfaces of the refraction layer 3, and spraying the reflection layer on the upper and lower surfaces of the refraction layer 4, and then laminating the processed refraction layer 3 and the refraction layer 4 together to form a single microstructure. Of course, those skilled in the art can also adopt different ways to form the microstructures 20 between the adjacent LED beads 102 according to the actual requirement, which is not illustrated here.
In the embodiment of the invention, in order to improve the light utilization rate of the backlight module, at least one surface of the reflective layer 202 away from the substrate 101 is a reflective surface, so that the light passing through the refractive layer can be reflected again by the reflective surface, thereby improving the light utilization rate of the corresponding area. Of course, the surface of the reflective layer 202 adjacent to the substrate 101 may be a reflective surface.
In the embodiment of the present invention, the material of the refraction layer 201 is optical glue, UV glue (ultraviolet light curing glue), prism glue, or the like. The reflective layer 202 includes one or both of reflective ink and reflective glue. In order to improve the light utilization efficiency of the region where the microstructure 20 is located, the microstructure 20 includes two refractive layers and two reflective layers, specifically, the microstructure 20 includes a first refractive layer 2011 and a second refractive layer 2012 which are sequentially stacked in a direction away from the substrate 101, and the refractive index of the first refractive layer 2011 is greater than that of the second refractive layer 2012. Taking the reflective layer 202 stacked in sequence away from the substrate 101 as the first reflective layer 2021 and the second reflective layer 2022, and taking the microstructure 20 as a prism as an example, a propagation path of light from the LED lamp bead 102 after passing through the microstructure 20 is shown in fig. 5. Light rays from the LED lamp bead 102 are incident on the first refraction layer 2011 and the second refraction layer 2012 respectively at the same incident angle i and are incident on the first refraction layer 2011 and the second refraction layer 2012 respectively at an emergent angle θ1And theta2Emitted due to the refractive index n of the first refractive layer 20111Greater than the refractive index n of the second refractive layer 20122It can be known that θ2Greater than theta1Therefore, light between two adjacent LED lamp beads 102 is more gathered, the light utilization rate is higher, the brightness of the area is correspondingly improved, and the brightness uniformity of the area is ensured. In the embodiment of the present invention, a person skilled in the art can select materials with different refractive indexes to form the refractive layer 201 and select the reflective layer 202 formed by corresponding materials according to actual needs, which will not be described in detail herein.
In the embodiment of the present invention, in order to improve the light utilization efficiency of the area where the microstructure 20 is located, the microstructure 20 specifically includes three refractive layers and three reflective layers. Specifically, the microstructure 20 includes a third refractive layer 2013, a fourth refractive layer 2014, and a fifth refractive layer 2015 sequentially stacked along the direction of the substrate 101, and a third reflective layer 2023, a fourth reflective layer 2024, and a fifth reflective layer 2025 sequentially stacked away from the substrate 101 as a reflective layer 202, and as shown in fig. 6, the microstructure 20 is a schematic side view structure of one of triangular prisms. In the specific implementation process, since the amount of light entering the region between every two adjacent LED lamp beads 102 from the LED light source 10 is a predetermined value, the more the number of refraction layers of the microstructure 20 between two adjacent LED lamp beads 102 is, the more the number of reflection layers is, the more the proportion of light exiting from the region is increased, the higher the exit rate of light in the corresponding region is, and thus, the brightness of the region is increased accordingly. The refraction layers and the reflection layers with a plurality of layers are arranged between the two adjacent LED lamp beads 102, so that the emergence rate of the corresponding area is improved, and the brightness uniformity of the backlight module is improved. Of course, the skilled person can set the number of layers of the microstructures 20 according to the actual requirement of the brightness of different areas of the backlight module, and the invention is not limited thereto.
In the embodiment of the present invention, in order to improve the diversified design of the backlight module, the microstructures 20 include one or more of a pyramid, a cone, a truncated pyramid, and a truncated cone. Of course, the person skilled in the art can also design microstructures 20 with different shapes according to actual needs, and will not be described in detail here. In specific implementations, the cross-sectional shape of the microstructure 20 in a plane parallel to the substrate 101 includes one or more of a rectangle, a triangle, and a circle. Since the refraction and reflection conditions of the microstructures 20 with different structural shapes on the light entering the two adjacent LED lamp beads 102 may be different, and the condition of the light exiting from the corresponding region may also be different, a person skilled in the art can select the microstructures 20 with corresponding shapes according to the actual requirement of the brightness in different regions of the backlight module, which is not limited herein.
Aiming at the problem that the existing backlight module is easy to cause uneven brightness of the backlight module when being bent, in the specific implementation process, the backlight module provided by the embodiment of the invention can be applied to a curved surface backlight module, such as a backlight module of a vehicle-mounted display screen with a large curved surface display requirement. Because the microstructures 20 are arranged between every two adjacent LED lamp beads 102, the light ray emergence rate and the utilization rate of the corresponding area are improved, the light-emitting uniformity of the curved surface backlight module is ensured, and the brightness uniformity of the curved surface backlight module is improved.
In the backlight module provided in the embodiment of the present invention, as shown in fig. 7, the backlight module may further include an optical film 30 located on the light emitting surface of the LED light source 10, and the optical film 20 may specifically include a prism structure, an anti-reflection film layer, a diffusion sheet, and the like, which is not limited herein.
Based on the same inventive concept, the embodiment of the present invention further provides a display device, where the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention. The implementation of the display device can be seen in the above embodiments of the backlight module, and repeated descriptions are omitted.
Specifically, as shown in fig. 8, the display device according to the embodiment of the present invention includes a liquid crystal display panel 40 and the backlight module 50 according to the embodiment of the present invention. It should be noted that, in the drawings, it is not shown that the display device is a curved display device, but actually, the display device provided in the embodiment of the present invention may also be a curved display device, and details are not described here.
In the embodiment of the invention, at least one microstructure 20 is arranged between two adjacent LED lamp beads arranged on the substrate 101 in an array manner, when the LED light source 10 works, after light rays from the LED light source 10 are refracted and reflected by a plurality of refraction layers and a plurality of reflection layers which are alternately stacked and arranged of the microstructure 20, the light ray utilization rate between the two adjacent LED lamp beads is improved, and the technical problem of uneven brightness is solved.
Based on the same inventive concept, the embodiment of the invention provides a manufacturing method of the backlight module. Because the principle of solving the problems of the manufacturing method is similar to that of the backlight module, the implementation of the manufacturing method can be referred to the implementation of the backlight module, and repeated details are not repeated.
Specifically, as shown in fig. 9, the method for manufacturing the backlight module according to the embodiment of the present invention may include:
s101: alternately forming a plurality of refraction layers and a plurality of reflection layers of the microstructure by adopting an injection molding mode and a spraying mode;
s102: and the microstructure is arranged between two adjacent LED lamp beads by adopting a spraying mode or a filling mode.
In the embodiment of the invention, the microstructure can be formed firstly, and then the microstructure is arranged between two adjacent LED lamp beads; the LED light source can also be formed firstly, and then the reflecting layer and the refracting layer of the microstructure are formed between the adjacent LED lamp beads. Specifically, a plurality of refraction layers can be formed by injection molding, a reflection layer is formed by spraying on the surface of each refraction layer, the processed refraction layers are attached together to form a microstructure, and then the microstructure is filled between two adjacent LED lamp beads. Or, a plurality of refraction layers are formed by spraying, then a reflection layer is formed by spraying on the surface of each refraction layer, and then the processed refraction layers are attached together, thereby forming the microstructure. And the reflecting layer can be directly formed between two adjacent LED lamp beads by spraying, and then the refraction layers are sprayed in a staggered mode in sequence, so that the microstructure is formed.
In the embodiment of the invention, at least one microstructure is arranged between two adjacent LED lamp beads, when the LED light source works, light from the LED light source passes through the plurality of refraction layers and the plurality of reflection layers which are alternately stacked and arranged of the microstructure, the light utilization rate between two adjacent LED lamp beads is effectively improved, the brightness between two adjacent LED lamp beads is improved, and the technical problem of uneven brightness is solved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (11)

1. A backlight module, comprising:
the LED lamp comprises an LED light source, a light source and a light source, wherein the LED light source comprises a substrate and LED lamp beads arranged on the substrate in an array manner;
the LED lamp comprises at least one microstructure arranged between two adjacent LED lamp beads, wherein the microstructure comprises a plurality of refraction layers and a plurality of reflection layers which are alternately stacked along the direction far away from the substrate, and one surface of each reflection layer far away from the substrate is a reflection surface.
2. The backlight module as claimed in claim 1, wherein the height of the microstructure along the direction perpendicular to the substrate is (h ± 0.2) mm, and h is the height of the LED lamp bead.
3. The backlight module of claim 1, wherein the maximum length of the microstructure in a direction parallel to the substrate is less than or equal to (L-1) mm, where L is a distance between two adjacent LED beads.
4. The backlight module of claim 1, wherein the backlight module comprises a central region and an edge region surrounding the central region, and a distribution density of the microstructures between two adjacent LED lamp beads in the central region is greater than a distribution density of the microstructures between two adjacent LED lamp beads in the edge region.
5. The backlight module of claim 1, wherein the microstructures comprise one or more of pyramids, cones, truncated pyramids, and truncated cones.
6. The backlight module of claim 1, wherein the microstructures have a cross-sectional shape parallel to the plane of the substrate that includes one or more of a rectangle, a triangle, and a circle.
7. The backlight module of claim 1, wherein the microstructures comprise a first refractive layer and a second refractive layer sequentially stacked along a direction away from the substrate, and the refractive index of the first refractive layer is greater than the refractive index of the second refractive layer.
8. The backlight module as claimed in claim 1, wherein the refractive layer is made of an optical adhesive.
9. The backlight module of claim 1, wherein the reflective layer comprises one or both of reflective ink and reflective glue.
10. A display device, comprising:
a liquid crystal display panel, and a backlight module according to any one of claims 1 to 9.
11. A method for manufacturing a backlight module according to any one of claims 1 to 9, comprising:
a plurality of refraction layers and a plurality of reflection layers of the microstructure are alternately formed along the direction far away from the substrate by adopting an injection molding mode and a spraying mode;
and the microstructure is arranged between two adjacent LED lamp beads by adopting a spraying mode or a filling mode.
CN201910818838.4A 2019-08-30 2019-08-30 Backlight module, display device and manufacturing method Active CN110515241B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910818838.4A CN110515241B (en) 2019-08-30 2019-08-30 Backlight module, display device and manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910818838.4A CN110515241B (en) 2019-08-30 2019-08-30 Backlight module, display device and manufacturing method

Publications (2)

Publication Number Publication Date
CN110515241A CN110515241A (en) 2019-11-29
CN110515241B true CN110515241B (en) 2022-03-01

Family

ID=68629877

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910818838.4A Active CN110515241B (en) 2019-08-30 2019-08-30 Backlight module, display device and manufacturing method

Country Status (1)

Country Link
CN (1) CN110515241B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113936541B (en) 2020-06-29 2023-02-21 京东方科技集团股份有限公司 Direct type backlight module and display device
CN112198713A (en) * 2020-10-21 2021-01-08 业成科技（成都）有限公司 Light source assembly, preparation method thereof, backlight module and display device
CN114442371B (en) * 2022-01-18 2023-06-02 武汉华星光电技术有限公司 Display backboard and display device
CN114613267B (en) * 2022-03-09 2023-09-19 深圳市南极光电子科技股份有限公司 Backlight lamp panel, backlight module and display
CN114613268B (en) * 2022-03-09 2024-01-23 深圳市南极光电子科技股份有限公司 Backlight source, backlight module and display
CN114627749A (en) * 2022-03-16 2022-06-14 广州华星光电半导体显示技术有限公司 Backlight module and display device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101865390A (en) * 2010-06-17 2010-10-20 深圳市华星光电技术有限公司 Backlight module and display device
CN101900280A (en) * 2010-07-30 2010-12-01 深圳市华星光电技术有限公司 Backlight module and display device
KR20100131763A (en) * 2009-06-08 2010-12-16 엘지디스플레이 주식회사 Backlight unit and liquid crystal display device having the same
WO2011025114A1 (en) * 2009-08-27 2011-03-03 엘지전자 주식회사 Display device
CN102419493A (en) * 2006-08-25 2012-04-18 3M创新有限公司 Backlight suitable for display devices
CN203731289U (en) * 2013-12-31 2014-07-23 京东方光科技有限公司 LED lamp strips, backlight module and display device
CN109360493A (en) * 2018-11-21 2019-02-19 厦门天马微电子有限公司 A kind of backlight module, display panel and electronic equipment

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105090826B (en) * 2015-08-10 2018-01-23 京东方科技集团股份有限公司 Backlight module and display device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102419493A (en) * 2006-08-25 2012-04-18 3M创新有限公司 Backlight suitable for display devices
KR20100131763A (en) * 2009-06-08 2010-12-16 엘지디스플레이 주식회사 Backlight unit and liquid crystal display device having the same
WO2011025114A1 (en) * 2009-08-27 2011-03-03 엘지전자 주식회사 Display device
CN101865390A (en) * 2010-06-17 2010-10-20 深圳市华星光电技术有限公司 Backlight module and display device
CN101900280A (en) * 2010-07-30 2010-12-01 深圳市华星光电技术有限公司 Backlight module and display device
CN203731289U (en) * 2013-12-31 2014-07-23 京东方光科技有限公司 LED lamp strips, backlight module and display device
CN109360493A (en) * 2018-11-21 2019-02-19 厦门天马微电子有限公司 A kind of backlight module, display panel and electronic equipment

Also Published As

Publication number Publication date
CN110515241A (en) 2019-11-29

Similar Documents

Publication Publication Date Title
CN110515241B (en) Backlight module, display device and manufacturing method
JP7231861B2 (en) Surface light source device, display device and electronic device
US10845524B2 (en) Light guide plate, planar light source apparatus, display apparatus, and electronic device
CN111665591B (en) Light guide plate, backlight module and liquid crystal display module
WO2018079395A1 (en) Illumination device and display device
CN210982988U (en) Display device
CN110609417B (en) Lamp panel and manufacturing method thereof, backlight source and display device
CN109445180B (en) Backlight module and display device
CN102236206A (en) Display apparatus
US9817176B2 (en) Display device including optical member having optical patterns
US9329323B2 (en) Light source and backlight module having the same
US11320696B2 (en) Backlight module, display, and mobile terminal
US9217819B2 (en) Backlight unit with conductive film and method for manufacturing
CN101093317A (en) Integral optical plate, and backlight assembly and liquid crystal display apparatus having the same
JP2010108795A (en) Illumination device, and display device
WO2021190414A1 (en) Display device
CN107438905B (en) Light emitting device array and lighting system including the same
CN112882281A (en) Display device
US9057806B2 (en) Light source and backlight module having the same
CN111402723B (en) Backlight module
KR101718486B1 (en) Back Light Unit and Display Apparatus
KR20170133757A (en) backlight unit and display apparatus using the same
KR102399433B1 (en) Backlight unit and display device having the same
CN114063346A (en) Display device
CN113721383A (en) Display device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant