CN112882281A - Display device - Google Patents
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- CN112882281A CN112882281A CN201911205512.0A CN201911205512A CN112882281A CN 112882281 A CN112882281 A CN 112882281A CN 201911205512 A CN201911205512 A CN 201911205512A CN 112882281 A CN112882281 A CN 112882281A
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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
- G02F1/133603—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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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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: the circuit board, the micro light-emitting diode and the protective layer; the protective layer covers a partial area of the circuit board including the micro light emitting diodes. The invention only coats the protective layer on the area distributed with the micro light-emitting diode, thus saving the using amount of the protective layer and saving materials. When the large-angle light emitted by the micro light-emitting diode enters the boundary surface between the side surface of the protective layer and the air, the incident angle is reduced, so that the light does not meet the total reflection condition any more, the large-angle light can be emitted outwards from the side surface of the protective layer, and the light emitting efficiency 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 the Mini LED lamp panel is welded with each Mini LED chip, a protective adhesive needs to be coated on the chip in a whole layer. The refractive index of the protective glue is usually larger than that of air, so that total reflection can occur at the interface of the protective glue and the air, and large-angle light cannot be emitted, so that the light emitting efficiency of the mini LED lamp panel is not high.
Disclosure of Invention
The invention provides a display device for improving the light emitting efficiency of a backlight module.
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 diodes are positioned on the circuit board and are arranged in an array manner;
the protective layer covers the micro light-emitting diode and is used for packaging and protecting the micro light-emitting diode;
wherein, the protective layer covers a part of the area of the circuit board including the micro light-emitting diode.
In a possible implementation manner, in the above display device provided by the present invention, the protective layer is formed in a pattern extending along the micro light emitting diode rows and/or along the micro light emitting diode columns.
In a possible implementation manner, in the display device provided by the present invention, the graphic is a bar line;
the extending direction of the strip line is parallel to the direction of the micro light-emitting diode row; or,
the extending direction of the strip lines is parallel to the direction of the micro light-emitting diode columns.
In a possible implementation manner, in the above display device provided by the present invention, a pitch between two adjacent micro light emitting diodes in an extending direction parallel to the bar line is smaller than a pitch between two adjacent micro light emitting diodes in an extending direction perpendicular to the bar line.
In a possible implementation manner, in the display device provided by the present invention, the pitch between adjacent micro light emitting diodes satisfies the following relationship:
0.8≤Lx/Ly<1；
where Lx denotes a pitch between adjacent two micro light emitting diodes in an extending direction parallel to the stripe line, Ly denotes a pitch between adjacent two micro light emitting diodes in an extending direction perpendicular to the stripe line.
In a possible implementation manner, in the display device provided by the present invention, the graph is a spiral curve formed by winding outward from a micro light emitting diode located at a central position as a starting point; or, the graph is a continuous wave curve; or,
the graph is a plurality of strip lines; the strip lines comprise a first strip line and a second strip line; the extending direction of the first strip line is parallel to the direction of the micro light-emitting diode row, and the extending direction of the second strip line is parallel to the direction of the micro light-emitting diode row; the first strip line and the second strip line cross each other.
In a possible implementation manner, in the display device provided by the invention, the width of the cross section of the protective layer in the direction perpendicular to the extending direction is gradually reduced along the direction away from the circuit board.
In a possible implementation manner, in the display device provided by the invention, a cross section of the protective layer perpendicular to the extending direction is semicircular or semi-elliptical.
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 reflecting coating is positioned on one side of the circuit board close to the micro light-emitting diode; the reflective coating includes a fenestration for exposing the micro light-emitting diode;
the transparent substrate is positioned on one side, away from the circuit board, of the protective layer and the reflective coating;
the diffusion plate is positioned on one side of the transparent substrate, which is far away from 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 comprises a miniature light-emitting diode lamp panel as a backlight source; the miniature LED lamp plate includes: the circuit board has the functions of bearing and supporting and is used for providing power; the micro light-emitting diodes are positioned on the circuit board and are arranged in an array; the protective layer covers the micro light-emitting diode and is used for packaging and protecting the micro light-emitting diode; the protective layer covers a partial area of the circuit board including the micro light-emitting diode. The protective layer is coated only in the area where the micro light-emitting diodes are distributed, so that the using amount of the protective layer can be saved, and materials are saved. When the large-angle light emitted by the micro light-emitting diode enters the boundary surface between the side surface of the protective layer and the air, the incident angle is reduced, so that the light does not meet the total reflection condition any more, the large-angle light can be emitted outwards from the side surface of the protective layer, and the light emitting efficiency 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 emergent light path diagrams of a Mini LED lamp panel provided in the embodiment of the present invention;
fig. 4 is a second emergent light path diagram of the Mini LED lamp panel according to the embodiment of the present invention;
fig. 5 is one of schematic top view structural diagrams of a Mini LED lamp panel according to an embodiment of the present invention;
fig. 6 is a second schematic top view of the Mini LED lamp panel according to the embodiment of the present invention;
fig. 7 is a third schematic view of a top view structure of a Mini LED lamp panel according to an embodiment of the present invention;
fig. 8 is a fourth schematic view of a top view structure of the Mini LED lamp panel according to the embodiment of the present invention;
fig. 9 is a fifth schematic view of a top view structure of the Mini LED lamp panel according to the embodiment of the present invention;
fig. 10 is a second schematic cross-sectional structure view of a Mini LED lamp panel according to an embodiment of the present invention;
fig. 11 is a third schematic cross-sectional structure view of a Mini LED lamp panel according to an embodiment of the present invention;
fig. 12 is a third emergent light path diagram of the Mini LED lamp panel according to the embodiment of the present invention;
fig. 13 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.
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 backlight module according to the embodiment of the present invention includes a micro light emitting diode lamp panel (Mini LED lamp panel) 1. The Mini LED lamp panel is used as a backlight source of the display device.
The Mini LED lamp panel 1 includes a circuit board 11, a micro LED 12 and a protection layer 13.
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.
The micro light emitting diodes 12 are located on the circuit board 11, and the micro light emitting diodes 12 are arranged in an array. 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 12 may be a monochromatic micro light emitting diode with a size of 50 μm to 300 μm. The micro light emitting diodes 12 are arranged in an array, which is beneficial to design the spacing of the micro light emitting diodes according to the light emitting requirement of the backlight module.
The protective layer 13 covers the micro light emitting diode 12, and the protective layer 13 is used for packaging the micro light emitting diode 12, so that the adverse conditions of dropping, moisture and the like of the micro light emitting diode are effectively prevented. The material used for the protective layer 13 includes silicon gel, epoxy resin or other colloid material with higher transmittance. In practical applications, the micro light emitting diodes 12 may be formed on the surface by spraying.
In practical applications, in order to improve the production efficiency of the protective layer 13, a whole protective layer is generally formed on the surfaces of the micro light emitting diode 12 and the circuit board 11 by a full-surface spraying method. However, since the refractive index of the colloid material used for the protective layer is greater than that of air, when light rays incident into the protective layer from the micro light emitting diode enter the interface between the protective layer and air, the light rays are incident from the optically dense medium to the optically sparse medium, and a total reflection phenomenon of the light rays may occur.
Fig. 3 is a schematic diagram of an exit light path of a Mini LED lamp panel according to an embodiment of the present invention, as shown in fig. 3, when the protective layer 13 is formed on the surfaces of the circuit board 11 and the micro light emitting diodes 12 in a whole layer, the high-angle light emitted from the micro light emitting diodes 12 first enters the protective layer 13, the refractive index of the protective layer 13 is greater than that of air, and when the exit angle of the light is α, the incident angle of the light entering the interface between the protective layer 13 and the air from the protective layer 13 is also α. As shown in fig. 3, if the incident angle α to the interface between the protective layer and the air is larger than the critical angle of the interface, the light cannot be incident into the air layer and is totally reflected back to the protective layer 13.
In order to overcome the above total reflection problem, it is necessary to use a material with a lower refractive index to make the protective layer 13, and when the refractive index of the protective layer 13 is 1.41, the critical angle for generating total reflection is 44.13 degrees, that is, only the light with the exit angle less than 44.13 degrees of the light emitted from the micro light emitting diode 12 can exit from the protective layer 13 and enter the air. If the protective layer 13 is made of a material with a higher refractive index, for example, if the refractive index of the protective layer is 1.54, the critical angle of total reflection is reduced to 39.88 degrees, and only the light with the exit angle smaller than 39.88 degrees of the light emitted from the micro light emitting diode can exit from the protective layer 13, so that the utilization rate of the light source is low.
In view of this, as shown in fig. 2, in the backlight module provided in the embodiment of the present invention, the protection layer 13 covers a partial area of the circuit board 11 including the micro light emitting diodes 12, and the protection layer is coated only on the area where the micro light emitting diodes are distributed in the embodiment of the present invention, so that the usage amount of the protection layer can be saved, and the material can be saved.
Fig. 4 is a second schematic diagram of an exit light path of the Mini LED lamp panel according to the embodiment of the present invention, and as shown in fig. 4, light emitted from the micro light emitting diode 12 first enters the protective layer 13 and then enters the air. In the prior art, the protective layer 13 is entirely covered on the circuit board, so that light can only be emitted from the upper surface of the protective layer, the emission angle of the large-angle light ray a emitted from the micro light emitting diode is alpha, the incident angle of the light ray a when the light ray a enters the boundary surface between the upper surface of the protective layer 13 and the air is also alpha, and the refractive index of the protective layer 13 is greater than that of the air, so that the incident light ray a greater than the critical angle can be totally reflected back into the protective layer by the upper surface of the protective layer to form reflected light ray a1。
In the embodiment of the present invention, the protective layer 13 covers only the surface of the micro light emitting diode 12, rather than the whole layer, so that the large-angle light ray a emitted from the micro light emitting diode 12 can enter the interface between the side surface of the protective layer 13 and the air. The side surface of the protective layer 13 intersects the upper surface to reduce the incident angle of the light ray a incident on the side surface, and the incident angle of the light ray a incident on the side surface of the protective layer and the air interface is smaller than the critical angle, so that the light ray can be emitted into the air. Therefore, the protective layer 13 is only arranged on the surface of the micro light-emitting diode, so that the large-angle light emitted by the micro light-emitting diode 12 can be emitted from the side surface of the protective layer, more light can be emitted into the air layer by the micro light-emitting diode, and the light emitting efficiency is improved.
For example, the protective layer 13 still uses a silica gel material with a refractive index of 1.41, and the critical angle for generating total reflection is 44.13 degrees. If the exit angle of the high-angle light ray a emitted from the micro light emitting diode 12 is 80 degrees, the conversion of the incident angle when the light enters the surface of the protective layer side can be 10 degrees, that is, the incident angle when the light enters the surface of the protective layer side is smaller than the critical angle, so that the light can be transmitted to the air layer without total reflection. Therefore, the protective layer is arranged in the partial area with the micro light-emitting diode, so that the large-angle light emitted by the micro light-emitting diode can be emitted from the side surface of the protective layer, and the light emitting efficiency is improved.
Fig. 5 is a schematic diagram of a top view structure of a Mini LED lamp panel according to an embodiment of the present invention, fig. 6 is a schematic diagram of a second top view structure of a Mini LED lamp panel according to an embodiment of the present invention, as shown in fig. 5 and fig. 6, the micro light emitting diodes 12 in an embodiment of the present invention are arranged in an array, the protective layer 13 may be formed as a pattern extending along a micro light emitting diode row and/or a micro light emitting diode column, fig. 5 shows a pattern extending along a micro light emitting diode column, and fig. 6 shows a pattern extending along a micro light emitting diode column.
According to the embodiment of the invention, the protective layer is coated only in the area of the row and/or the column of the micro light-emitting diode, so that the using amount of the protective layer can be saved, and the material can be saved. And the pattern of the protective layer 13 may extend in the direction of the rows and/or columns of micro-leds, and the material of the protective layer may be sprayed in the direction of the rows or columns of micro-leds during the manufacturing process, thereby forming the pattern of the protective layer 13.
In a practical manner, as shown in fig. 5 and 6, the pattern of the protective layer 13 provided by the embodiment of the present invention may include a bar line; as shown in fig. 5, the extending direction of the bar lines may be parallel to the direction of the micro light emitting diode columns; alternatively, as shown in fig. 6, the extending direction of the stripe lines may be parallel to the direction of the micro light emitting diode rows.
The spraying of the protective colloid material in the direction of the rows or columns of the micro light-emitting diodes is easier to control in the process. The spraying amount of the protective colloid material is controlled according to the arrangement rule of the micro light-emitting diodes, and the arrangement distance of the micro light-emitting diodes is generally fixed and unchangeable, so that the spraying amount of the protective colloid is only required to be set once, the linear spraying is carried out on the positions of the micro light-emitting diodes along the row or column direction of the micro light-emitting diodes, the packaging requirement can be met, and meanwhile, the light emitting efficiency can be improved.
As shown in fig. 5, in the embodiment of the present invention, a pitch Lx between two adjacent micro light emitting diodes 12 in the extending direction parallel to the stripe line is smaller than a pitch Ly between two adjacent micro light emitting diodes 12 in the extending direction perpendicular to the stripe line.
As can be seen from fig. 5 and 6, when the pattern of the protective layer 13 is a stripe line, the outgoing efficiency of the outgoing light in the cross section perpendicular to the extending direction of the stripe line is improved, but the outgoing light parallel to the extending direction of the stripe line still has the problem that the outgoing light cannot be outgoing with a large angle, so that in order to make the overall brightness of the backlight module more uniform, the number of micro light emitting diodes arranged in the direction perpendicular to the stripe line can be reduced to increase the distance between the stripe lines. The light emitted from the cross section perpendicular to the extending direction of the strip line is more, the overall brightness of the backlight module is not reduced even if the number of the micro light emitting diodes arranged perpendicular to the direction of the strip line is reduced, and the emergent brightness in the Lx direction and the emergent brightness in the Ly direction can be relatively uniform.
In specific implementation, the spacing between adjacent micro light emitting diodes may satisfy the following relationship:
0.8≤Lx/Ly<1；
where Lx denotes a pitch between the adjacent two micro light emitting diodes 12 in the extending direction parallel to the stripe line, Ly denotes a pitch between the adjacent two micro light emitting diodes 12 in the extending direction perpendicular to the stripe line.
The micro light emitting diodes 12 have a size of about 50 μm to 300 μm, so the light emitting range is limited, in order to protect the backlight module from emitting light relatively uniformly, and in order to avoid dark stripes between adjacent micro light emitting diodes 12, the distance between the micro light emitting diodes 12 cannot be set too large, but in the embodiment of the invention, the pattern of the protective layer 13 is a plurality of strip lines, the light emitting efficiency in a cross section perpendicular to the extending direction of the strip lines is large, so the distance between two adjacent micro light emitting diodes perpendicular to the extending direction of the strip lines can be set to be relatively larger than the distance between two adjacent micro light emitting diodes along the extending direction parallel to the strip lines. The angle of the emergent light of the micro light-emitting diode can reach 180 degrees, but the energy is concentrated in the range of +/-60 degrees, and in order to protect the uniform emergent brightness of the Lx direction and the Ly direction, the Lx/Ly <1 > can be set to be more than or equal to 0.8.
Fig. 7 is a third schematic diagram of a top view structure of a Mini LED lamp panel according to an embodiment of the present invention, and in another practical implementation manner, as shown in fig. 7, the pattern of the protective layer 13 may be a spiral curve formed by winding the micro light emitting diode 12 located at the center outward one by one.
In the actual manufacturing process, the protective colloid material can be sprayed in a continuous circling manner from the micro light-emitting diode at the central position along the direction of the row or the column of the micro light-emitting diode until the surfaces of all the micro light-emitting diodes are coated with the protective colloid material. The spraying device can be continuously operated by adopting the manufacturing method, no break point exists in the middle, the spraying device does not need to be repeatedly switched on and off, and the spraying device does not need to be repeatedly positioned, so that the operation difficulty of the spraying device is reduced.
Meanwhile, when the pattern of the protection layer 13 adopts a spiral curve, the pattern includes a pattern extending along the row direction of the micro light emitting diodes and a pattern extending along the column direction of the micro light emitting diodes, so that the light emitting efficiency of the micro light emitting diodes can be improved in the row and column directions, the light emitting brightness of the backlight module in the row and column directions is relatively uniform, and the distance between the micro light emitting diodes in the row and column directions is relatively balanced.
Fig. 8 is a fourth schematic diagram of a top view structure of a Mini LED lamp panel according to an embodiment of the present invention, and in another practical manner, as shown in fig. 8, the graph of the protective layer 13 is a continuous wave curve.
In the actual manufacturing process, the spraying device may be still used to spray the protective colloid material along the direction of the micro led row or column, but unlike the above embodiments, the spraying device does not need to be turned off when the protective colloid material is sprayed to the end of the micro led row or column, and only needs to adjust the direction to move to the adjacent micro led row or column to continue spraying, and after reaching the adjacent micro led row or column, the protective colloid material is sprayed along the direction of the micro led row or column, so that the protective layer 13 forms the waveform curve as shown in fig. 8. The spraying device can be continuously operated by adopting the manufacturing method, no break point exists in the middle, the spraying device does not need to be repeatedly switched on and off, and the spraying device does not need to be repeatedly positioned, so that the operation difficulty of the spraying device is reduced.
Fig. 9 is a fifth schematic view of a top view structure of a Mini LED lamp panel according to an embodiment of the present invention, and in another practical manner, as shown in fig. 9, a graph of the protective layer 13 is a plurality of strip lines; the bar lines include a first bar line 131 and a second bar line 132; the extending direction of the first bar line 131 is parallel to the direction of the micro light emitting diode row, and the extending direction of the second bar line 132 is parallel to the direction of the micro light emitting diode row; the first strip line 131 and the second strip line 132 cross each other.
In the actual manufacturing process, a protective colloid material may be sprayed on the surface of each row of micro light-emitting diodes along the row direction of the micro light-emitting diodes to form a plurality of patterns of first strip lines 131; and then spraying a protective colloid material on the surface of each row of micro light-emitting diodes along the direction of the rows of micro light-emitting diodes to form a plurality of second strip lines 132. The linear spraying path has low control requirements on the spraying device, and the formed patterns of the first strip line 131 and the second strip line 132 which are mutually crossed can improve the light emitting efficiency of the micro light emitting diodes in the row and column directions, so that the light emitting brightness of the backlight module in the row and column directions is relatively uniform, and the distance between the micro light emitting diodes in the row and column directions is relatively balanced.
Fig. 10 is a second schematic cross-sectional structure view of the Mini LED lamp panel provided in the embodiment of the invention, and fig. 11 is a third schematic cross-sectional structure view of the Mini LED lamp panel provided in the embodiment of the invention, as shown in fig. 10 and fig. 10
As shown in fig. 11, the cross-sectional pattern of the protective layer 13 in the direction perpendicular to the extending direction is a tapered pattern along the direction away from the circuit board 11, that is, the width of the cross-sectional pattern on the side close to the circuit board 11 is greater than the width on the side away from the circuit board 11, so that the outer wall of the protective layer 13 forms an inclined plane, and thus the incident angle of light incident on the inclined plane can be reduced, thereby avoiding the occurrence of the total reflection phenomenon and improving the light emitting efficiency.
Fig. 12 is a third schematic diagram of an exit light path of a Mini LED lamp panel according to an embodiment of the present invention, as shown in fig. 12, a dotted line in the diagram is a position of a whole protective layer, and when a light ray a emitted from a micro light emitting diode and having the same exit angle α enters a boundary surface between the protective layer and air, the boundary surface is inclined with respect to an original boundary surface, so that the light ray enters the boundary surface and is almost perpendicular to the boundary surface, and an incident angle entering the boundary surface between the protective layer 13 and the air is far smaller than the original incident angle α and is close to 0, so as to avoid a total reflection phenomenon of the light ray at the boundary surface between the protective layer and.
As can be seen from comparing fig. 3 and 12, when the protective layer is entirely disposed, the light ray a is totally reflected at the interface between the protective layer and the air,so that the light beam is partially reflected back to the protective layer to form a reflected light beam a1(ii) a In the embodiment of the present invention, the protective layer has a pattern extending along the row and/or column direction of the micro-leds, and the high-angle light ray a emitted from the micro-leds can pass through the interface between the protective layer 13 and the air to form the transmitted light ray a' incident into the air. Therefore, the light emitted from the micro light-emitting diode to the air layer can be increased, and the light emitting efficiency is improved.
In the actual manufacturing process, the protective layer 13 may be made of silica gel, epoxy resin or other colloid materials with high transmittance, and since the colloid materials have certain fluidity, when the protective layer is sprayed on the micro light emitting diodes 12 in the row or column direction, the colloid materials will flow to both sides, and due to the tension of the colloid itself, the surface of the protective layer 13 will form a smooth curved surface structure. By controlling the spraying width of the protective layer 13 and the amount of the colloid material used, the cross section of the protective layer 13 in the direction perpendicular to the extending direction can be formed into a semicircular shape as shown in fig. 10 or a semi-elliptical shape as shown in fig. 11. In practical application, the center of the cross section of the light-emitting center of the micro light-emitting diode can be positioned at the semicircular or semi-elliptical center of the cross section, so that the incident angle of light emitted from the cross section is almost 0 when the light enters the boundary surface between the protective layer and air, thereby effectively avoiding the total reflection of the light at the interface between the protective layer and the air and improving the light emitting efficiency in the cross section. Besides, the sectional patterns of the protective layer 13 can be set to be triangular patterns or other patterns with inclined surfaces, which can also reduce the incident angle of the interface and avoid the total reflection of the emergent light.
Fig. 13 is a schematic cross-sectional structure view of a backlight module according to an embodiment of the present invention, and as shown in fig. 13, the backlight module further includes: a reflective coating 14, a transparent substrate 15, a diffuser plate 16 and an optical membrane 17.
The reflective coating 14 is positioned on one side of the circuit board 11 close to the micro light-emitting diode 12; the reflective coating 14 includes a window for exposing the micro-leds 12. The reflective coating 14 may be a protective layer located above the circuit board 11, and when a material having a reflective property is coated on the surface of the circuit board 11, the protective layer has a reflective function at the same time, and can reflect light incident toward one side of the circuit board 11, thereby improving the utilization efficiency of the light. In the embodiment of the present invention, the reflective coating 14 may be made of white oil or the like.
After the wiring of the circuit board, a layer of white oil is coated on the surface of the circuit board, and the positions of the pads for welding the micro light-emitting diodes 12 are exposed through etching and other processes. In the embodiment of the present invention, the protective layer with reflective function is referred to as a reflective coating, the reflective coating 14 has a window for exposing the bonding pad for bonding the micro light emitting diode, and the micro light emitting diode 12 is bonded on the corresponding bonding pad of the circuit board, so that the micro light emitting diode 12 is located in the corresponding window.
A transparent substrate 15 on the side of the protective layer 13 and the reflective coating 14 facing away from the circuit board 11. The transparent substrate in the embodiment of the invention is made of a high-light-transmission material. The transparent substrate is capable of transmitting light from the micro-leds 12 and serves to support the diffuser plate. The material of the transparent substrate 15 may be selected from at least one of polymethyl methacrylate or polycarbonate, but is not limited thereto, and the transparent substrate 15 may be made of other high-reflectivity, low-absorbance materials. The light is reflected for many times in the transparent substrate 15, and the attenuation of the light in the transparent substrate 15 can be reduced as much as possible by adopting a material with high reflectivity and low absorptivity, so that the light utilization rate of the backlight module is improved, and the power consumption is reduced. The transparent substrate 15 acts as a support structure for the diffuser plate, allowing the light emitted by the micro-leds 12 to be sufficiently mixed before reaching the diffuser plate.
In the embodiment of the invention, the thickness of the transparent substrate 15 satisfies the light mixing distance of the micro light emitting diode 12, so that the emergent light of the micro light emitting diode can be fully mixed when reaching the diffusion plate, and the backlight effect is ensured. In the embodiment of the present invention, the thickness of the transparent substrate 15 is not more than 10 mm.
In specific implementation, in order to limit the overall thickness of the backlight module, an acrylic plate can be used to manufacture the transparent substrate, and the thickness is 1mm-3 mm. The larger the thickness of the transparent substrate 15 is, the stronger the reduction effect on the emergent light is, and the size of the micro light emitting diode 12 is smaller, and compared with the traditional light emitting diode, the distance between the micro light emitting diodes 12 can be made smaller, therefore, the light mixing distance of the micro light emitting diode 12 can be much smaller compared with the traditional light emitting diode, so that the transparent substrate 15 is arranged in the range of 1mm-3mm, the light mixing requirement of the micro light emitting diode 12 can be met, and the reduction effect on the light by the transparent substrate 15 can be reduced.
The pitch of the micro light emitting diodes 12 is relatively small, and it is not possible to provide a support in the array of the micro light emitting diodes 12 to support a diffusion plate, in the embodiment of the present invention, the transparent substrate 15 is disposed on the side of the protection layer 13 away from the micro light emitting diodes 12, and the transparent substrate can also be used as a support for the diffusion plate 16, and the diffusion plate 16 is directly placed on the transparent substrate 15, so as to overcome the above problems.
And the diffusion plate 16 is positioned on the side of the transparent substrate 15, which faces away from the protective layer 13. The scattering material in the diffusion plate can continuously refract and reflect the passing light, so that the effect of scattering the light is achieved, and the effect of light uniformization is further achieved. The diffuser plate is made of at least one material selected from the group consisting of polymethyl methacrylate (PMMA), Polycarbonate (PC), polystyrene-based material (PS) and polypropylene (PP).
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 diffusion sheet, a reflective polarizer, etc., and these films are added to the backlight module in order 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 comprises a miniature light-emitting diode lamp panel; the miniature LED lamp plate includes: the circuit board has the functions of bearing and supporting and is used for providing power; the micro light-emitting diodes are positioned on the circuit board and are arranged in an array; the protective layer covers the micro light-emitting diode and is used for packaging and protecting the micro light-emitting diode; the protective layer covers a partial area of the circuit board including the micro light-emitting diode. According to the embodiment of the invention, the protective layer is coated only in the area where the micro light-emitting diode is distributed, so that the using amount of the protective layer can be saved, and materials can be saved. When the large-angle light emitted by the micro light-emitting diode enters the boundary surface between the side surface of the protective layer and the air, the incident angle is reduced, so that the light does not meet the total reflection condition any more, the large-angle light can be emitted outwards from the side surface of the protective layer, and the light emitting efficiency 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 is characterized in that a display panel is provided,
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 comprises a miniature light-emitting diode lamp panel which is used as a backlight source;
the miniature LED lamp plate includes:
the circuit board has the functions of bearing and supporting and is used for providing power;
the micro light-emitting diodes are positioned on the circuit board and are arranged in an array manner;
the protective layer covers the micro light-emitting diode and is used for packaging and protecting the micro light-emitting diode;
wherein, the protective layer covers a part of the area of the circuit board including the micro light-emitting diode.
2. The display device according to claim 1, wherein the protective layer is formed in a pattern extending in a direction of the micro light emitting diode rows and/or the micro light emitting diode columns.
3. The display device of claim 2, wherein the graphic is a bar line;
the extending direction of the strip line is parallel to the direction of the micro light-emitting diode row; or,
the extending direction of the strip lines is parallel to the direction of the micro light-emitting diode columns.
4. The display device according to claim 3, wherein a pitch between adjacent two micro light emitting diodes in an extending direction parallel to the stripe line is smaller than a pitch between adjacent two micro light emitting diodes in an extending direction perpendicular to the stripe line.
5. The display apparatus of claim 4, wherein the spacing between adjacent micro light emitting diodes satisfies the following relationship:
0.8≤Lx/Ly<1；
where Lx denotes a pitch between adjacent two micro light emitting diodes in an extending direction parallel to the stripe line, Ly denotes a pitch between adjacent two micro light emitting diodes in an extending direction perpendicular to the stripe line.
6. The display device according to claim 2, wherein the pattern is a spiral curve that is wound outward from a centrally located micro light emitting diode; or,
the graph is a continuous wave curve; or,
the graph is a plurality of strip lines; the strip lines comprise a first strip line and a second strip line; the extending direction of the first strip line is parallel to the direction of the micro light-emitting diode row, and the extending direction of the second strip line is parallel to the direction of the micro light-emitting diode row; the first strip line and the second strip line cross each other.
7. The display device according to claim 2, wherein a width of a cross section of the protective layer in a direction perpendicular to the extending direction is gradually reduced in a direction away from the circuit board.
8. The display device according to claim 7, wherein a cross section of the protective layer perpendicular to the extending direction is a semicircular shape or a semi-elliptical shape.
9. The display device according to any one of claims 1 to 8, wherein the micro light emitting diode has a size of 50 μm to 300 μm.
10. The display device of any one of claims 1-8, wherein the backlight module further comprises:
the reflecting coating is positioned on one side of the circuit board close to the micro light-emitting diode; the reflective coating includes a fenestration for exposing the micro light-emitting diode;
the transparent substrate is positioned on one side, away from the circuit board, of the protective layer and the reflective coating;
the diffusion plate is positioned on one side of the transparent substrate, which is far away from 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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| CN201911205512.0A CN112882281A (en) | 2019-11-29 | 2019-11-29 | Display device |
| PCT/CN2020/132446 WO2021104494A1 (en) | 2019-11-29 | 2020-11-27 | Display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911205512.0A CN112882281A (en) | 2019-11-29 | 2019-11-29 | Display device |
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| CN112882281A true CN112882281A (en) | 2021-06-01 |
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| CN201911205512.0A Pending CN112882281A (en) | 2019-11-29 | 2019-11-29 | Display device |
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| CN115472102A (en) * | 2022-10-18 | 2022-12-13 | 业成科技（成都）有限公司 | Pattern display device and pattern display method |
| WO2023184122A1 (en) * | 2022-03-28 | 2023-10-05 | 京东方科技集团股份有限公司 | Light-emitting substrate, light-emitting module and display device |
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