CN112882282A - Display device - Google Patents
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- CN112882282A CN112882282A CN201911205770.9A CN201911205770A CN112882282A CN 112882282 A CN112882282 A CN 112882282A CN 201911205770 A CN201911205770 A CN 201911205770A CN 112882282 A CN112882282 A CN 112882282A
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- emitting diode
- circuit board
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- 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
- G02F1/133603—Direct backlight with LEDs
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- 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 invention discloses a display device, which comprises a backlight module and a display panel, wherein the backlight module comprises a light source, a light source and a light guide plate; the backlight module comprises a circuit board, a miniature light emitting diode, a protective layer and a reflective coating, wherein the reflective coating is provided with a window, and the miniature light emitting diode is positioned in the window. The thickness of the reflective coating is set to be larger than or equal to the height of the miniature light-emitting diode, so that the windowing has larger depth, the protective layer is arranged inside the windowing to package and protect the miniature light-emitting diode, and meanwhile, the used materials of the protective layer can be greatly reduced, and the cost is saved. The inner side surface of the window of the reflective coating is set to be an inclined surface, the inclined surface receives emergent light which is emitted by the micro light-emitting diode and is larger than a set angle, the emergent light is reflected to an interface between the protective layer and the air medium, the inclined surface can reduce an incident angle when the light enters a boundary surface between the protective layer and the air medium, total reflection of the light at the interface is avoided, and therefore the emergent efficiency of the light is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
With the development of display technology, liquid crystal display technology is widely used in the display field. The lcd panel itself cannot emit light, and the backlight module is required to provide the required brightness for displaying. Due to the limitation of the characteristics of the liquid crystal panel, light leakage occurs to different degrees, and the improvement of the contrast ratio has a bottleneck. Therefore, a scheme for performing local dimming (local dimming) on the backlight module is provided, and backlights in different areas can be independently controlled, so that when the backlight brightness corresponding to a high-brightness part in a displayed image can be maximized, and the backlight brightness corresponding to a dark part in the image can be reduced, so that the displayed image can achieve better contrast.
The micro Light Emitting Diode (Mini LED) has become a current hotspot in the liquid crystal display technology as a backlight, which is different from the traditional liquid crystal display backlight scheme adopting a side-in type Light guide plate, and a huge amount of Mini LEDs are adopted as the backlight source, so that not only can the backlight be thinned, but also more refined dynamic control can be realized, and the dynamic contrast of the liquid crystal display is improved.
After each Mini LED chip of welding of Mini LED lamp plate, need glue at the whole layer coating protection in the top of chip, extravagant material, the refracting index of protection simultaneously is glued and is greater than the air refracting index usually, consequently can take place the total reflection at the interface of protection glue and air, leads to the unable outgoing of wide-angle light to make the luminous efficacy of Mini LED lamp plate not high.
Disclosure of Invention
The invention provides a display device which is used for improving the light emitting efficiency of a Mini LED and reducing the manufacturing cost of a Mini LED lamp panel.
In a first aspect, the present invention provides a display device comprising:
the backlight module is used for providing backlight;
the display panel is positioned on the light emitting side of the backlight module and used for displaying images;
the backlight module includes:
the circuit board has the functions of bearing and supporting and is used for providing power;
the micro light-emitting diode is positioned on the circuit board;
the reflecting coating is positioned on the surface of one side, close to the micro light-emitting diode, of the circuit board, a window is arranged on the reflecting coating, and the micro light-emitting diode is positioned in the window; the thickness of the reflective coating is greater than or equal to the height of the micro light-emitting diode;
and the protective layer is positioned in the window, covers the miniature light-emitting diode and is used for packaging and protecting the light-emitting diode.
In a possible implementation manner, in the display device provided by the present invention, a surface of the window facing the micro light emitting diode is an inclined surface relative to the circuit board, and a size of the window on a side close to the circuit board is smaller than a size of the window on a side far from the circuit board; the inclined surface of the window is used for receiving and reflecting emergent light rays which are emitted by the micro light-emitting diode and are larger than a set angle.
In a possible implementation manner, in the display device provided by the invention, a surface of the protection layer on a side away from the circuit board is an arc-shaped surface protruding towards a side away from the circuit board.
In a possible implementation manner, in the display device provided by the invention, the maximum distance between the arc-shaped surface of the protective layer and the circuit board is greater than or equal to the thickness of the reflective coating.
In a second aspect, the present invention provides a display device comprising:
the backlight module is used for providing backlight;
the display panel is positioned on the light emitting side of the backlight module and used for displaying images;
the backlight module includes:
the circuit board has the functions of bearing and supporting and is used for providing power;
the micro light-emitting diode is positioned on the circuit board;
the reflecting coating is positioned on the surface of one side of the circuit board, which is close to the micro light-emitting diode, a window is arranged on the reflecting coating, and the micro light-emitting diode is positioned in the window;
the protective layer covers the micro light-emitting diode and is used for packaging and protecting the light-emitting diode;
the surface of the windowing window facing the micro light-emitting diode is an inclined surface relative to the circuit board, and the size of the windowing window at the side close to the circuit board is smaller than that at the side far away from the circuit board; the inclined surface of the window is used for receiving and reflecting emergent light rays which are emitted by the micro light-emitting diode and are larger than a set angle.
In a possible implementation manner, in the display device provided by the invention, the protective layer covers the reflective coating and the surface of the micro light emitting diode on the side facing away from the circuit board.
In a possible implementation manner, in the display device provided by the present invention, an included angle between the inclined surface of the window and the normal of the circuit board satisfies the following relationship:
wherein theta represents an angle between the inclined surface of the window and a normal of the circuit board, n represents a refractive index of the protective layer,
and the included angle between the emergent light of the micro light-emitting diode and the normal of the circuit board is represented.
In a possible implementation manner, in the display device provided by the invention, the material of the reflective coating is white oil.
In a possible implementation manner, in the display device provided by the invention, the size of the micro light emitting diode is 50 μm to 300 μm.
In a possible implementation manner, in the display device provided by the present invention, the backlight module further includes:
the transparent substrate is positioned on one side, away from the circuit board, of the reflective coating and the protective layer;
a diffusion plate positioned on one side of the transparent substrate, which is far away from the reflective coating and the protective layer;
and the optical membrane is positioned on one side of the diffusion plate, which is far away from the transparent substrate.
The invention has the following beneficial effects:
the present invention provides a display device including: the backlight module is used for providing backlight; the display panel is positioned on the light emitting side of the backlight module and used for displaying images; the backlight module includes: the circuit board has the functions of bearing and supporting and is used for providing power; the micro light-emitting diode is positioned on the circuit board; the reflecting coating is positioned on the surface of one side of the circuit board, which is close to the micro light-emitting diode, a window is arranged on the reflecting coating, and the micro light-emitting diode is positioned in the window; and the protective layer covers the micro light-emitting diode and is used for packaging and protecting the light-emitting diode.
Set the thickness of reflective coating more than or equal to miniature emitting diode's height to make the windowing have great degree of depth, set up the protective layer inside the windowing, guarantee that the protective layer covers miniature emitting diode fully, encapsulate the protection to miniature emitting diode, compare in the scheme that whole layer covered the protective layer simultaneously, the use material of protective layer that can significantly reduce practices thrift the cost.
The inner side surface of the window of the reflective coating is set to be an inclined surface, the inclined surface receives emergent light which is emitted by the micro light-emitting diode and is larger than a set angle (namely a large angle), the emergent light is reflected to an interface between the protective layer and the air medium, the inclined surface can reduce an incident angle when the light enters a boundary surface between the protective layer and the air medium, total reflection of the light at the interface is avoided, and therefore the emergent efficiency of the light is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention;
fig. 2 is one of schematic cross-sectional structural diagrams of a Mini LED lamp panel according to an embodiment of the present invention;
fig. 3 is one of schematic top view structural diagrams of a Mini LED lamp panel according to an embodiment of the present invention;
fig. 4 is a second schematic view of a top view structure of the Mini LED lamp panel according to the embodiment of the present invention;
FIG. 5 is a diagram of the exit path of a Mini LED in the prior art;
FIG. 6 is a diagram of the exit path of the Mini LED of FIG. 2;
fig. 7 is a second schematic cross-sectional structure view of a Mini LED lamp panel according to an embodiment of the present invention;
fig. 8 is a third schematic cross-sectional structure view of a Mini LED lamp panel according to an embodiment of the present invention;
FIG. 9 is a diagram of the exit path of the Mini LED of FIG. 8;
fig. 10 is a schematic cross-sectional structure view of a backlight module according to an embodiment of the invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words expressing the position and direction described in the present invention are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the present invention. The drawings of the present invention are for illustrative purposes only and do not represent true scale.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 1, the display device according to the embodiment of the present invention includes:
a backlight module 100 for providing backlight; the backlight module 100 can uniformly emit light in the whole light emitting surface, and is used for providing light with sufficient brightness and uniform distribution for the display panel, so that the display panel can normally display images.
The display panel 200 is located on the light emitting side of the backlight module 100 for displaying images. The display panel 200 has a plurality of pixel units arranged in an array, and each pixel unit can independently control the transmittance and color of light incident to the pixel unit from the backlight module 100, so that the light transmitted by all the pixel units forms a displayed image.
The display device provided by the embodiment of the invention can be a display device such as a liquid crystal display screen, a liquid crystal display, a liquid crystal television and the like, and can also be a mobile terminal such as a mobile phone, a tablet personal computer, an intelligent photo album and the like. The display device adopts the backlight module to provide backlight, and the display panel modulates the light emitted by the backlight module to realize image display. The backlight module provided by the embodiment of the invention can adopt the Mini LED lamp panel as a light source, the size of the Mini LED is smaller than that of the traditional LED, and a large number of Mini LEDs are adopted as backlight sources, so that more refined dynamic control can be realized, and the dynamic contrast of liquid crystal display is improved.
The backlight module 100 provided by the embodiment of the invention comprises a Mini LED lamp panel, and the Mini LED lamp panel is used as a backlight source. Fig. 2 is a schematic cross-sectional view of a Mini LED lamp panel according to an embodiment of the present invention, and as shown in fig. 2, the Mini LED lamp panel includes a circuit board 11, a micro light emitting diode 12, a reflective coating 13, and a protective layer 14.
The circuit board 11 has a bearing and supporting function and is used for providing power.
In the embodiment of the present invention, the circuit board 11 is used for providing a driving electrical signal for the micro light emitting diode 12. The micro light-emitting diode 12 and the circuit board 11 are manufactured separately, the surface of the circuit board 11 comprises a plurality of windows for welding the micro light-emitting diodes, the windows comprise two bonding pads for welding electrodes of the micro light-emitting diodes respectively, after the micro light-emitting diodes 12 are manufactured, the micro light-emitting diodes 12 are transferred to the upper side of the windows of the bonding pads of the circuit board 11, the micro light-emitting diodes 12 are welded on the circuit board 11 through processes such as reflow soldering and the like, and therefore the micro light-emitting diodes 12 can be driven to emit light through input signals of the control circuit board 11.
In a specific implementation, the Circuit Board 11 may be a Printed Circuit Board (PCB), where the PCB includes an electronic Circuit and an insulating layer, and the insulating layer exposes a pad of the electronic Circuit, which is soldered to the micro light emitting diode 12, and covers the rest of the electronic Circuit.
Alternatively, the circuit board 11 may be an array substrate formed by fabricating a thin film transistor driving circuit on a substrate, the surface of the array substrate may have a connection electrode (i.e., the pad in the window) connected to the thin film transistor driving circuit, and the electrodes of the micro light emitting diodes 12 may be soldered to the connection electrodes in a one-to-one correspondence manner. The substrate or the substrate base plate of the above circuit board 11 may be made of a flexible material to form a flexible display device.
In the embodiment of the present invention, the circuit board 11 is plate-shaped and has a rectangular or square shape as a whole. The length of the circuit board 11 is 200mm-800mm, and the width is 100mm-500 mm. According to the size of the display device, in the embodiment of the invention, the display device may include a plurality of circuit boards 11, and the circuit boards 11 jointly provide backlight for the display device in a splicing manner. In order to avoid the optical problem caused by the splicing of the circuit boards 11, the splicing seams between the adjacent circuit boards 11 are as small as possible, and even seamless splicing is realized.
And the micro light-emitting diode 12 is positioned on the circuit board 11. The micro light emitting diode 12 is soldered on the pad of the circuit board 11, and the micro light emitting diode 12 is different from a common light emitting diode, which is specifically referred to as a micro light emitting diode chip. Since the micro led 12 has a small size, the light emitting chip is advantageous to control dynamic light emission to a smaller partition, which is advantageous to improve the contrast of a picture. In the embodiment of the present invention, the micro light emitting diode 102 may be a monochromatic micro light emitting diode with a size of 50 μm to 300 μm.
The reflective coating 13 is located on the surface of the circuit board 11 close to the micro light emitting diode 12, the reflective coating 13 can be a protective layer located above the circuit board, and when the reflective material is coated on the surface of the circuit board 11, the protective layer has a reflective effect at the same time, and can reflect light incident to one side of the circuit board 11 back, so that the utilization efficiency of the light is improved. In the embodiment of the present invention, the reflective coating 13 is made of white oil or the like.
After wiring of the circuit board, a layer of white oil is coated on the surface of the circuit board, and positions where the bonding pads for welding the micro light-emitting diodes are located are exposed through etching and other processes. In the embodiment of the present invention, the protective layer with a reflective function is referred to as a reflective coating, as shown in fig. 2, a window 131 is disposed on the reflective coating 13, a pad for soldering the micro light emitting diode is exposed in the window, and in the following manufacturing process, the micro light emitting diode 12 is soldered on the corresponding pad of the circuit board, so that the micro light emitting diode 12 is located in the corresponding window 131. In the present embodiment, the thickness of the reflective coating 13 is greater than or equal to the height of the micro light emitting diodes 12.
As shown in fig. 2, in the embodiment of the present invention, a surface of the window 131 of the reflective coating 13 facing the micro light emitting diode 12 is an inclined surface with respect to the circuit board 11, and a dimension of the window 131 on a side close to the circuit board 11 is smaller than a dimension of a side far from the circuit board 11.
As shown in fig. 2, the inner side wall of the window 131 is an inclined surface, the top view structure of the window 131 is shown in fig. 3 and 4, the window 131 may be an inverted circular truncated cone, and the top view structure thereof is shown in fig. 3; alternatively, the window 131 may have an inverted truncated pyramid shape, and its plan view configuration is as shown in fig. 4. The inner side of the window 131 has a reflection function for the wide-angle light emitted from the micro light emitting diode 12, and the specific shape of the window 131 is not limited during the manufacturing process as long as the window has an inclined inner side and is used for receiving and reflecting the wide-angle light emitted from the micro light emitting diode 12.
In the embodiment of the present invention, the inner surface of the window of the reflective coating 13 is set as an inclined surface, and the inclined surface is used for receiving the outgoing light beam emitted by the micro light emitting diode 12 and larger than a set angle (i.e. a large angle) and reflecting the received light beam, thereby reducing the incident angle when the reflected light beam enters the protective layer 14 and the air medium, improving the total reflection problem of the protective layer 14 and the air interface, and improving the outgoing efficiency of the light beam.
The following specifically describes the light path principle of the large-angle emergent light of the micro light emitting diode 12 in the embodiments of the present invention:
fig. 5 is a schematic diagram of a light path of a large-angle light emitted from a micro light emitting diode 12 in the prior art, as shown in fig. 5, the large-angle light a emitted from the micro light emitting diode 12 is directly incident into a medium of a protective layer 14, when the light is incident into a boundary surface between the protective layer 14 and air, a total reflection phenomenon occurs at an interface between the two media because a refractive index of the protective layer 14 is greater than a refractive index of air, and when an incident angle of the light incident into the interface is greater than a critical angle, the light can only be reflected back into the protective layer 14 and cannot be emitted to the outside. For example, when the refractive index of the light-transmitting material used for the protective layer 14 is 1.4, the light emitted from the micro light-emitting diode 12 at a angle greater than 44 degrees is reflected, thereby significantly reducing the light emission efficiency.
In order to overcome the above problem, the embodiment of the present invention provides the inner side surface of the window 131 in the reflective coating layer 13 as an inclined surface. Fig. 6 is a schematic view of a light path of a large-angle light emitted from the micro light emitting diode 12 according to an embodiment of the present invention, as shown in fig. 6, an emitted light a with the same emitting angle first enters the inner wall of the window and is reflected by the inner wall of the window, and the reflected light a1And then to the interface between the protective layer 14 and the air. As can be seen from comparing fig. 5 and fig. 6, after the outgoing light ray a is reflected by the window, the incident angle of the outgoing light ray a on the boundary surface between the protective layer 14 and the air is reduced because the inner surface of the window is a surface that is expanded and inclined outward, and thus the outgoing angle of the light ray after being reflected by the window is relatively reduced, so that when the incident angle of the light ray on the boundary surface between the protective layer 14 and the air is reduced, the light ray that would originally undergo total reflection no longer satisfies the total reflection condition, and can be emitted into the air medium, and the small-angle light ray emitted by the micro light emitting diode 12 is not incident on the inclined surface of the window,therefore, the light can be smoothly emitted according to the original light path, and the originally totally reflected large-angle emergent light can be emitted to the outside by arranging the window with the inclined surface on the reflective coating 13, so that the light emitting efficiency is improved.
In one embodiment, the thickness of the reflective coating 13 can be increased so that the inclined surface of the window 131 can receive all the light emitted from the micro-leds 12 in a wide angle range. Fig. 7 is a second schematic cross-sectional structure view of the Mini LED lamp panel according to the embodiment of the present invention, and as shown in fig. 7, a thickness h1 of the reflective coating 13 may be set to be greater than or equal to a height h2 of the micro light emitting diode 12. In specific implementation, the height of the micro light emitting diode 12 is about 100 μm, the thickness of the reflective coating 13 can be set within a range of 100 μm to 200 μm, the high-angle light emitted from the micro light emitting diode 12 generally enters the bottom of the reflective coating 13 close to the circuit board 11, the reflective coating with the thickness of 100 μm to 200 μm can basically receive and reflect the light emitted from the micro light emitting diode within the high-angle range, and the reflective coating with the thickness of 100 μm to 200 μm cannot block the light emitted from the micro light emitting diode 12 within the low-angle range.
As shown in fig. 2, in the embodiment of the present invention, a protective colloid material may be directly dispensed in the opening 131 where the micro light emitting diode 12 is located to encapsulate the micro light emitting diode 12, and the protective layer 14 is formed in the opening. Because the protective colloid has certain fluidity, the height of the reflective coating 13 is set to be greater than or equal to that of the micro light-emitting diode 12, after the protective colloid is coated in the window 131, the protective layer 14 can completely cover the micro light-emitting diode 12 without overflowing outside the hollow area, the purpose of packaging the micro light-emitting diode 12 is achieved, and meanwhile, the using amount of the protective colloid can be saved.
The protective adhesive has a certain viscosity, so that when the protective adhesive is dispensed into the window 131, due to the surface tension of the adhesive material, the surface of the side of the protective layer 14 facing away from the circuit board forms an arc-shaped surface protruding toward the side facing away from the circuit board 11 above the micro light emitting diode 12. First, the protective layer 14 with the arc surface can protect the micro light emitting diode 12 from being covered completely, so as to meet the packaging requirement. Secondly, the emergent light reflected by the window 131 or the light directly emitted from the micro light emitting diode 12 is incident on the interface of the arc surface, and the incident angle at the interface is further reduced relative to the planar interface, so as to avoid the occurrence of total reflection, and more large-angle light can be emitted to the outside after being reflected by the window 131.
In the manufacturing process, the height of the protective layer 14 formed in the window can be controlled by controlling the amount of the protective paste applied to the window 131. In the embodiment of the present invention, as shown in fig. 7, the maximum distance h3 between the arc surface of the protective layer 14 and the circuit board 11 may be set to be greater than or equal to the thickness h1 of the reflective coating. As described above, the height of the micro light emitting diode 12 is about 100 μm, the thickness of the reflective coating 13 can be set within a range of 100 μm to 200 μm, and the maximum height of the protective layer 14 can be set within a range of 100 μm to 300 μm, so that the usage amount of the protective layer is not too small, the micro light emitting diode 12 is not completely packaged, and the usage amount of the protective layer is not too large, thereby saving the material.
On the other hand, an embodiment of the invention provides a display device, which may include a backlight module and a display panel, and the structure of the display device is the same as that of fig. 1, which is not described herein again.
Wherein, backlight unit can include the Mini LED lamp plate, and this Mini LED lamp plate uses as the backlight.
Fig. 8 is a third schematic cross-sectional structure view of a Mini LED lamp panel according to an embodiment of the present invention, and as shown in fig. 8, the Mini LED lamp panel according to the embodiment of the present invention includes: a circuit board 11, micro light emitting diodes 12, a reflective coating 13 and a protective layer 14.
The circuit board 11 has a bearing and supporting function and is used for providing power;
the micro light-emitting diode 12 is positioned on the circuit board 11;
the reflective coating 13 is positioned on the surface of the circuit board 11 close to one side of the micro light-emitting diode 12, a window 131 is arranged on the reflective coating 13, and the micro light-emitting diode 12 is positioned in the window;
and the protective layer 14 covers the micro light-emitting diode 12 and is used for packaging and protecting the light-emitting diode 12.
The materials and the arrangement dimensions of the circuit board 11, the micro light emitting diode 12, the reflective coating 13 and the protective layer 14 provided by the embodiment of the present invention can be referred to the above embodiments, and are not described herein again.
As shown in fig. 8, in the embodiment of the present invention, a surface of the window 131 of the reflective coating 13 facing the micro light emitting diode 12 is an inclined surface relative to the circuit board 11, and a size of the window 131 on a side close to the circuit board 11 is smaller than a size of a side far from the circuit board 11; the inclined surface of the window 131 is used to receive and reflect the outgoing light rays emitted from the micro light emitting diode 12, which are larger than a set angle.
FIG. 9 is a light path diagram of the wide-angle light emitted from the micro light emitting diode 12 when the structure shown in FIG. 8 is adopted, and as shown in FIG. 9, the same wide-angle light a will be firstly incident on the inclined surface of the window, and after being reflected by the inclined surface of the window, the reflected light a is formed1Reflecting light ray a1And then to the interface incidence of protective layer 14 and air, because the inside surface of windowing 131 is the surface that expands the slope to the outside, therefore the outgoing angle can reduce relatively after its reflection, like this, after the incident angle that the light incides the interface of protective layer 14 and air reduces, the light that originally can take place the total reflection no longer satisfies the total reflection condition this moment, can be emergent in the air medium, and the small-angle light of miniature emitting diode 12 outgoing can not incide on the inclined surface of windowing, consequently can be smoothly emergent according to the original light path, through set up windowing 131 that has the inclined surface on reflective coating 13, can make the big angle outgoing light that is totally reflected originally can outwards be emergent, the outgoing efficiency of light has been improved.
As shown in fig. 8, the Mini LED lamp panel provided in the embodiment of the present invention may form a whole protective layer 14 on the surfaces of the reflective coating 13 and the micro light emitting diode 12 by a whole-surface spraying method, and the whole-layer spraying method may simplify the packaging step and improve the production efficiency.
In-process of productionIn operation, the surface of the final protective layer 14 on the side facing away from the circuit board is generally planar due to the fluidity of the glue. As shown in fig. 9, if the inclined surface of the window forms an angle θ with the normal of the circuit board 11, the angle between the emergent light ray a of the micro light emitting diode 12 and the normal of the circuit board is
The incident angle of the light ray a upon incidence on the inclined surface is
If the surface of the protective layer 14 on the side facing away from the circuit board 11 is perpendicular to the normal of the circuit board 11, the light ray a reflected by the inclined surface1Incident angle upon the upper surface of the protective layer 14 is
According to the law of refraction and total reflection of light, if the light ray a1The total reflection does not occur at the upper surface of the incident protective layer 14, the following condition needs to be satisfied:
wherein n is the refractive index of the protective layer, n0Is the refractive index of air.
This makes it possible to obtain:
wherein theta represents an angle between the inclined surface of the window and a normal line of the circuit board, n represents a refractive index of the protective layer,
the included angle between the emergent light of the micro light-emitting diode and the normal of the circuit board is shown.
As can be seen from the above formula, to avoidThe light emitted from the micro light emitting diode 12 is prevented from being totally reflected at the interface between the incident light and the air of the protective layer 14, and the inclination angle of the inclined surface of the window can be designed according to the maximum emergent angle of the light emitted from the micro light emitting diode 12. For example, if the micro-leds 12 are considered to have an exit angle of 180 °, the maximum angle between the exiting light and the normal of the circuit board may be up to 90 °, i.e. the angle mentioned above
The protective layer 14 is made of a silicone material and has a refractive index of 1.4, and the angle between the inclined surface and the normal of the circuit board 11 can be designed to be 67 ° by substituting the formula.
In practical applications, the micro light emitting diode 12 usually has a maximum exit angle, and therefore, an inclination angle between the inclined surface of the window and the normal of the circuit board can be designed according to the maximum exit angle, so that light emitted by the micro light emitting diode can not be totally reflected at an interface between the protective layer and air, and the light emitted by the micro light emitting diode can be emitted to the outside, thereby improving the light emission efficiency.
Fig. 10 is a schematic cross-sectional structure view of a backlight module according to an embodiment of the present invention, and as shown in fig. 10, the backlight module according to the embodiment of the present invention may further include: a transparent substrate 15, a diffuser plate 16 and an optical film 16.
A transparent substrate 15 on the side of the reflective coating 13 and the protective layer 14 facing away from the circuit board 11. And a transparent substrate 15 for supporting the diffusion plate 16 and allowing light from the micro light emitting diodes 12 to pass therethrough. The material of the transparent substrate 15 may be selected from polymethyl methacrylate, polycarbonate, or the like. The transparent substrate 15 serves as a support structure for the diffuser plate 16, allowing the light emitted by the micro-leds 12 to be sufficiently mixed before reaching the diffuser plate 16. In the embodiment of the present invention, the thickness of the transparent substrate 15 satisfies the light mixing distance of the micro light emitting diode 12, so as to ensure the backlight effect. In a specific implementation, the thickness of the transparent substrate 15 is not greater than 10 mm.
And a diffuser plate 46 positioned on a side of the transparent substrate 15 facing away from the reflective coating 13 and the protective layer 14. The diffusion plate 16 is usually provided with a scattering particle material, and after the light enters the diffusion plate 16, the scattering particle material continuously refracts and reflects the light, so as to scatter the light, and further realize the function of light uniformization. The material of the diffuser plate is generally at least one selected from the group consisting of polymethyl methacrylate (PMMA), Polycarbonate (PC), polystyrene-based material (PS), and polypropylene (PP), but not limited thereto.
And an optical film 17 positioned on a side of the diffuser plate 16 facing away from the transparent substrate 15. The optical film set 17 may include one or more of a prism sheet, a quantum dot film, a reflective polarizer, etc., and the purpose of adding these films to the backlight module is to adapt the backlight module to various practical applications. For example, the prism sheet may change the exit angle of light, thereby changing the viewable angle of the display device. The quantum dot film can provide quantum dot luminescence with higher monochromaticity, and is applied to quantum dot televisions to improve the display color gamut of the televisions. The reflective polarizer can improve the utilization rate of light, and simultaneously, the emergent light has polarization property, thereby omitting the use of the polarizer under the liquid crystal display panel.
The display device provided by the embodiment of the invention comprises: the backlight module is used for providing backlight; the display panel is positioned on the light emitting side of the backlight module and used for displaying images; the backlight module includes: the circuit board has the functions of bearing and supporting and is used for providing power; the micro light-emitting diode is positioned on the circuit board; the reflecting coating is positioned on the surface of one side of the circuit board, which is close to the micro light-emitting diode, a window is arranged on the reflecting coating, and the micro light-emitting diode is positioned in the window; and the protective layer covers the micro light-emitting diode and is used for packaging and protecting the light-emitting diode.
Set the thickness of reflective coating more than or equal to miniature emitting diode's height to make the windowing have great degree of depth, set up the protective layer inside the windowing, guarantee that the protective layer covers miniature emitting diode fully, encapsulate the protection to miniature emitting diode, compare in the scheme that whole layer covered the protective layer simultaneously, the use material of protective layer that can significantly reduce practices thrift the cost.
The inner side surface of the window of the reflective coating is set to be an inclined surface, the inclined surface receives emergent light which is emitted by the micro light-emitting diode and is larger than a set angle (namely a large angle), the emergent light is reflected to an interface between the protective layer and the air medium, the inclined surface can reduce an incident angle when the light enters a boundary surface between the protective layer and the air medium, total reflection of the light at the interface is avoided, and therefore the emergent efficiency of the light is improved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A display device, comprising:
the backlight module is used for providing backlight;
the display panel is positioned on the light emitting side of the backlight module and used for displaying images;
the backlight module includes:
the circuit board has the functions of bearing and supporting and is used for providing power;
the micro light-emitting diode is positioned on the circuit board;
the reflecting coating is positioned on the surface of one side, close to the micro light-emitting diode, of the circuit board, a window is arranged on the reflecting coating, the micro light-emitting diode is positioned in the window, and the thickness of the reflecting coating is larger than or equal to the height of the micro light-emitting diode;
and the protective layer is positioned in the window, covers the miniature light-emitting diode and is used for packaging and protecting the light-emitting diode.
2. The display device according to claim 1, wherein a surface of the window facing the micro light emitting diode is an inclined surface with respect to the circuit board, and a dimension of the window at a side close to the circuit board is smaller than a dimension of a side far from the circuit board; the inclined surface of the window is used for receiving and reflecting emergent light rays which are emitted by the micro light-emitting diode and are larger than a set angle.
3. The display device according to claim 1, wherein a surface of the protective layer on a side facing away from the circuit board is an arc-shaped surface protruding toward a side facing away from the circuit board.
4. The display device of claim 3, wherein a maximum distance between the arc-shaped surface of the protective layer and the circuit board is greater than or equal to a thickness of the reflective coating.
5. A display device, comprising:
the backlight module is used for providing backlight;
the display panel is positioned on the light emitting side of the backlight module and used for displaying images;
the backlight module includes:
the circuit board has the functions of bearing and supporting and is used for providing power;
the micro light-emitting diode is positioned on the circuit board;
the reflecting coating is positioned on the surface of one side of the circuit board, which is close to the micro light-emitting diode, a window is arranged on the reflecting coating, and the micro light-emitting diode is positioned in the window;
the protective layer covers the micro light-emitting diode and is used for packaging and protecting the light-emitting diode;
the surface of the windowing window facing the micro light-emitting diode is an inclined surface relative to the circuit board, and the size of the windowing window at the side close to the circuit board is smaller than that at the side far away from the circuit board; the inclined surface of the window is used for receiving and reflecting emergent light rays which are emitted by the micro light-emitting diode and are larger than a set angle.
6. The display device of claim 5, wherein the protective layer covers the reflective coating and a surface of the micro light emitting diodes on a side facing away from the circuit board.
7. The display device according to claim 2 or 5, wherein the inclined surface of the window and the normal line of the circuit board satisfy the following relationship:
wherein theta represents an angle between the inclined surface of the window and a normal of the circuit board, n represents a refractive index of the protective layer,
and the included angle between the emergent light of the micro light-emitting diode and the normal of the circuit board is represented.
8. A display device as claimed in claim 1 or 5, characterized in that the material of the reflective coating is white oil.
9. The display device according to claim 1 or 5, wherein the micro light emitting diode has a size of 50 μm to 300 μm.
10. The display device according to claim 1 or 5, wherein the backlight module further comprises:
the transparent substrate is positioned on one side, away from the circuit board, of the reflective coating and the protective layer;
a diffusion plate positioned on one side of the transparent substrate, which is far away from the reflective coating and the protective layer;
and the optical membrane is positioned on one side of the diffusion plate, which is far away from the transparent substrate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911205770.9A CN112882282A (en) | 2019-11-29 | 2019-11-29 | Display device |
| PCT/CN2020/132447 WO2021104495A1 (en) | 2019-11-29 | 2020-11-27 | Display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911205770.9A CN112882282A (en) | 2019-11-29 | 2019-11-29 | Display device |
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| CN112882282A true CN112882282A (en) | 2021-06-01 |
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| CN201911205770.9A Pending CN112882282A (en) | 2019-11-29 | 2019-11-29 | Display device |
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