CN114527603B - Backlight module and display panel - Google Patents
Backlight module and display panel Download PDFInfo
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- CN114527603B CN114527603B CN202210247925.0A CN202210247925A CN114527603B CN 114527603 B CN114527603 B CN 114527603B CN 202210247925 A CN202210247925 A CN 202210247925A CN 114527603 B CN114527603 B CN 114527603B
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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
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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
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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
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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- Nonlinear Science (AREA)
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Led Device Packages (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention provides a backlight module and a display panel, comprising: the LED display device comprises a substrate, a plurality of light sources and a reflecting layer, wherein the light sources and the reflecting layer are positioned on the substrate, the reflecting layer comprises a plurality of reflecting parts, and the light sources are arranged between two adjacent reflecting parts; the color conversion layer for converting the color of the light emitted by the light source is arranged on one side of the reflecting layer away from the substrate, and the color conversion layer comprises a plurality of color conversion parts corresponding to the plurality of reflecting parts one by one, namely, the reflecting layer can be reused as a substrate, so that the thickness of the color conversion layer can be set smaller, the thickness of the backlight module is reduced, and the flexible development of the liquid crystal display panel comprising the backlight module is facilitated.
Description
Technical Field
The invention relates to the technical field of display, in particular to manufacturing of a display device, and particularly relates to a backlight module and a display panel.
Background
The LCD (Liquid Crystal Display ) has the advantages of low cost, high resolution, easy colorization and the like, and has wide application.
At present, flexible screens with flexibility and excellent flexibility gradually become a trend of future development. For the LCD panel, a backlight module is required to provide a light source on the basis of the LCD, however, the backlight module is limited by factors such as a large number of film layers and a large hardness, so that the backlight module cannot be bent to a large extent, which is not beneficial to the development of flexibility of the LCD panel.
Therefore, the flexibility development of the existing liquid crystal display panel is limited by the number of film layers and hardness of the backlight module, and improvement is urgently needed.
Disclosure of Invention
The invention aims to provide a backlight module and a display panel, which are used for solving the technical problems that the existing backlight module has a large number of film layers and large hardness, and is not beneficial to the flexible development of a liquid crystal display panel.
The embodiment of the invention provides a backlight module, which comprises:
a substrate;
a plurality of light sources located on the substrate;
the reflecting layer is positioned on the substrate and comprises a plurality of reflecting parts, and the light source is arranged between two adjacent reflecting parts;
the color conversion layer is positioned on one side of the reflecting layer away from the substrate and used for converting the color of light rays emitted by the light source, and comprises a plurality of color conversion parts which are in one-to-one correspondence with the reflecting parts, and the corresponding light source is arranged between every two adjacent color conversion parts.
In an embodiment, further comprising:
the light guide reflection layer is positioned at one side of the light sources far away from the substrate and one side of the color conversion layer far away from the substrate, and is provided with a plurality of open holes.
In one embodiment, the light guiding reflection layer includes a first light guiding reflection part opposite to the light source and a second light guiding reflection part opposite to the reflection part;
wherein the density of the openings in the first light guiding reflective portion is less than the density of the openings in the second light guiding reflective portion.
In an embodiment, the thickness of the color conversion layer is less than the thickness of the reflective layer.
In an embodiment, a distance between a side of the light source away from the substrate and the substrate is greater than a distance between a side of the color conversion layer away from the substrate and the substrate.
In one embodiment, the adjacent light sources and the reflecting portions are spaced apart.
In an embodiment, a product of a distance between a side of the color conversion layer away from the substrate and a tangent value of a light emission half angle of the corresponding light source is smaller than a distance between the corresponding light source and the corresponding reflection portion.
In an embodiment, further comprising:
the packaging adhesive layer is positioned on one side of the light sources, which is far away from the substrate, and one side of the color conversion layer, which is far away from the substrate, and is transparent.
In an embodiment, further comprising:
the plurality of box dam structures are positioned on one side, far away from the substrate, of the color conversion layer and correspond to the plurality of light sources one by one, each box dam structure is arranged around the corresponding side part of the light source, and the distance between one side, far away from the substrate, of each box dam structure and the substrate is larger than the distance between one side, far away from the substrate, of the corresponding light source and the substrate.
The embodiment of the invention also provides a display panel, which comprises a liquid crystal panel and the backlight module, wherein the liquid crystal panel and the backlight module are combined into a whole
The invention provides a backlight module and a display panel, comprising: a substrate; a plurality of light sources located on the substrate; the reflecting layer is positioned on the substrate and comprises a plurality of reflecting parts, and the light source is arranged between two adjacent reflecting parts; the color conversion layer is positioned on one side of the reflecting layer away from the substrate and used for converting the color of light rays emitted by the light source, and comprises a plurality of color conversion parts which are in one-to-one correspondence with the reflecting parts, and the corresponding light source is arranged between every two adjacent color conversion parts. The color conversion layer for converting the color of the light emitted by the light source is arranged on one side of the reflecting layer far away from the substrate, and the reflecting layer can be reused as a substrate, so that the thickness of the color conversion layer can be set smaller, the thickness of the backlight module is reduced, and meanwhile, the situation that the color conversion layer with larger thickness is independently manufactured above the light source or the situation that a packaging adhesive layer with larger Young modulus is formed by doping diffusion particles or fluorescent powder in a transparent adhesive film is avoided, and the color conversion layer with smaller thickness is formed is facilitated, so that the flexible development of the liquid crystal display panel comprising the backlight module is facilitated.
Drawings
The invention is further illustrated by the following figures. It should be noted that the drawings in the following description are only for illustrating some embodiments of the invention, and that other drawings may be obtained from these drawings by those skilled in the art without the inventive effort.
Fig. 1 is a schematic cross-sectional view of a backlight module according to an embodiment of the invention.
Fig. 2 is a schematic view of a locally enlarged light path of a backlight module according to an embodiment of the invention.
Fig. 3 is a schematic view of another partially enlarged light path of the backlight module according to the embodiment of the invention.
Fig. 4 is a schematic view of a manufacturing scenario of a backlight module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper", "approaching", "away" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, for example, "upper" merely indicates that the surface is above the object, specifically indicates that the surface is above, obliquely above, and the upper surface may all be above the object level, and the above orientations or positional relationships are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features.
In addition, it should be noted that the drawings merely provide structures and steps closely related to the present invention, and some details not related to the present invention are omitted, so as to simplify the drawings, and make the points of the present invention clear, and not to indicate that the apparatus and the method are in practice or the same as the drawings, and not to limit the apparatus and the method in practice.
The invention provides a backlight module, which comprises but is not limited to the following embodiments and combinations of the following embodiments.
In one embodiment, as shown in fig. 1, the backlight module 100 includes: a substrate 10; a plurality of light sources 201 on the substrate 10; a reflective layer, disposed on the substrate 10, including a plurality of reflective portions 301, wherein the light source 201 is disposed between two adjacent reflective portions 301; a color conversion layer, located at a side of the reflection layer away from the substrate 10, for converting the color of the light emitted by the light source 201; wherein the color conversion layer includes a plurality of the color conversion parts 401 corresponding to the reflection parts 301 one by one, and each of the color conversion parts 401 is located at a side of the corresponding reflection part 301 away from the substrate 10. Of course, each color conversion portion 401 may also extend to cover the corresponding reflection portion 301, so as to convert the light rays irradiated to the reflection portion 301 from all directions, and then reflect the light rays through the reflection portion 301, thereby improving the color conversion efficiency of the light rays.
The substrate 10 may be a flexible substrate, for example, the substrate 10 may be made of at least one material including, but not limited to, a material identical to a flexible circuit board substrate, a material identical to a printed circuit board substrate, and polyimide, so that the substrate 10 has ultra-thin flexible performance. The light source 201 may be, but not limited to, a mini LED (sub millimeter light emitting diode) or a micro LED (micro light emitting diode), and the color of light that the light source 201 may emit may be blue. The reflectivity of the reflective portion 301 may be 90% to 99%, for example, the reflective layer may be made of a material including, but not limited to, titanium dioxide doped in a resin, wherein the resin may be, but not limited to, acryl. The color conversion layer may be fabricated by at least one of the following methods including, but not limited to, doping fluorescent powder, QD quantum dots, and organic dye in glue.
Specifically, in conjunction with the above discussion, the blue light emitted by the light source 201 may be irradiated to the color conversion layer, the color conversion layer may convert the excitation portion of the blue light into red light and green light, and the three kinds of light are reflected to the side far from the substrate 10 through the reflection layer, and form white light through the light mixing effect to be emitted out of the backlight module 100. It can be appreciated that compared with the case where the color conversion layer is separately fabricated above the light source 201, in this embodiment, the reflective layer is used as the substrate, and the glue doped with at least one of the fluorescent powder, the QD quantum dot, and the organic dye is formed on the reflective layer to form the color conversion layer, that is, the reflective layer is multiplexed as the substrate, so that the thickness of the color conversion layer in this embodiment can be smaller, thereby reducing the thickness of the backlight module 100, and being beneficial to the development of flexibility of the liquid crystal display panel including the backlight module 100.
In an embodiment, the thickness of the color conversion layer is less than the thickness of the reflective layer. Specifically, the thickness of the reflective layer may be less than or equal to 100 micrometers, the reflective layer may be attached to the substrate 10 by, but not limited to, gluing, the thickness of the color conversion layer may be less than 50 micrometers, further, the thickness of the color conversion layer may be 30 micrometers, and the color conversion layer may be formed on the reflective layer by, but not limited to, coating. It can be appreciated that the thickness of the reflective layer in this embodiment is larger, so that the color conversion layer can be better carried, so as to improve the stability of fixing the reflective layer and the color conversion layer.
Specifically, in conjunction with the discussion above, the color conversion layer may include: the glue layer is positioned on one side of the reflecting layer far away from the substrate; the color conversion particles are dispersed in the glue layer, and the composition materials of the color conversion particles comprise at least one of fluorescent powder, QD quantum dots and organic dye. As can be seen from the above discussion, the color conversion layer with smaller thickness can be formed based on the reflective layer as the substrate, which is beneficial to the light and thin arrangement of the backlight module 100. It can be understood that the glue layer and the color conversion particles in the present embodiment may be formed by doping the color conversion particles in glue, and then coating the glue doped with the color conversion particles on the reflective layer by coating, so as to form a glue layer doped with a plurality of color conversion particles, wherein the thickness of the glue layer can be understood as the thickness of the color conversion layer.
In one embodiment, as shown in fig. 1 to 3, the backlight module 100 further includes: the light guide reflection layer 70 is provided with a plurality of openings 02 on a side of the light sources 201 away from the substrate 10 and a side of the color conversion layer away from the substrate 10. Wherein the thickness of the light guiding reflective layer 70 may be 0.1 to 10 micrometers, and the reflectivity of the light guiding reflective layer 70 may be 60 to 99%, for example, the light guiding reflective layer 70 may be made of metal or organic matter, wherein the metal may include, but is not limited to, aluminum, silver, and the organic matter may refer to the above description of the constituent materials of the reflective layer, and further, the light transmittance of the light guiding reflective layer 70 may be set lower to block light from exiting the light guiding reflective layer 70.
Specifically, as shown in fig. 3, which is a schematic light-mixing and light-emitting diagram of the light source 201, it can be seen that, in conjunction with the above discussion, the blue light ray B emitted from the light source 201 can be irradiated to the color conversion portion 401, or can be blocked and reflected by the light guiding reflective layer 70 to form the reflected light representing the blue light ray B, and then the blue light ray B is incident to the color conversion portion 401, further, the color conversion portion 401 can convert the excited portion of the blue light ray B into the red light ray R and the green light ray G, and the three light rays are reflected by the reflective portion 301 and mixed to form the white light including the blue light ray B, the red light ray R and the green light ray G, and the white light is emitted from the aperture 02 to the backlight module 100. It can be understood that the light guiding reflective layer 70 in this embodiment can reflect and transmit the blue light B emitted from the light source 201, and combine with the functions of the reflective layer and the color conversion layer to make the blue light B emitted from the light source 201 emit out of the backlight module 100 as white light.
In one embodiment, as shown in fig. 1, the light guiding reflective layer 70 includes a first light guiding reflective portion 701 disposed opposite to the light source 201, and a second light guiding reflective portion 702 disposed opposite to the reflective portion 301; wherein the density of the holes 02 in the first light guiding reflective part 701 is smaller than the density of the holes 02 in the second light guiding reflective part 702. Here, the density of the openings 02 in the first light guiding reflective portion 701 is taken as an example, and the density of the openings 02 in the first light guiding reflective portion 701 can be understood as a ratio of an area of orthographic projection of the openings 02 on the substrate 10 to an area of orthographic projection of the first light guiding reflective portion 701 on the substrate 10, that is, it can be considered that the larger the density of the openings 02 in the first light guiding reflective portion 701, the larger the area ratio of orthographic projection of the openings 02 in the first light guiding reflective portion 701 on the substrate 10, that is, the larger the light transmittance. Specifically, the number of the openings 02 in the second light guiding reflective portion 702 may be set larger, and the area of the orthographic projection of the single opening 02 on the substrate 10 may be set larger, whereas the number of the openings 02 in the first light guiding reflective portion 701 may be set smaller, and the area of the orthographic projection of the single opening 02 on the substrate 10 may be set smaller.
As can be appreciated, in the present embodiment, the light transmittance of the first light guiding reflective portion 701 is smaller than that of the first light guiding reflective portion 701, and as can be seen from the above discussion, in conjunction with fig. 1 and 3, on one hand, most of the blue light B generated by the light source 201 can be reflected to the color conversion layer under the action of the first light guiding reflective portion 701, so that the blue light B transmitted through the first light guiding reflective portion 701 is less, the risk of color shift of the backlight module 100 is reduced, and the blue light B emitted by the light source 201 can be sufficiently acted by the color conversion layer to improve the color conversion efficiency; on the other hand, the light source 201 is the source of the light, and the first light guiding and reflecting portion 701 can avoid the phenomenon that a large amount of energy is transmitted to cause too little light reflected to the second light guiding and reflecting portion 702 to cause uneven light of the backlight module 100.
In an embodiment, as shown in fig. 1 to 3, the distance between the side of the light source 201 away from the substrate 10 and the substrate 10 is greater than the distance between the side of the color conversion layer away from the substrate 10 and the substrate 10. Specifically, since the light source 201 can emit light in all directions, in this embodiment, the height of the upper surface of the color conversion portion 401 is set to be lower than the height of the upper surface of the light source 201, so that the light source 201 can be prevented from being completely blocked by the projection of the reflection portion 301 and the corresponding color conversion portion 401 on the light source 201 along the horizontal direction, on one hand, the light of the light source 201 close to the corresponding reflection portion 301 can be emitted between two adjacent light sources 201, so that less light between the two adjacent light sources 201 is avoided, the light emitting uniformity of the backlight module 100 is effectively improved, on the other hand, the light of the light source 201 close to the corresponding reflection portion 301 can be emitted to the light guiding reflection layer 70, and the white light is generated by combining the color conversion layer through the reflection effect of the light guiding reflection layer 70.
In one embodiment, as shown in fig. 1 to 3, the adjacent light sources 201 and the reflecting portions 301 are spaced apart. It should be noted that, if the adjacent light source 201 and the reflecting portion 301 are disposed in contact, the light generated on the side of the light source 201 facing the corresponding reflecting portion 301 will be blocked by the corresponding reflecting portion 301 and cannot be emitted; it can be understood that, in this embodiment, since the adjacent light sources 201 and the reflecting portions 301 are disposed at intervals, the distance between the light sources 201 and the corresponding reflecting portions can realize that the light generated on the side of the light sources 201 facing the corresponding reflecting portions 301 is incident to the corresponding second light guiding reflecting portions 702 for use.
Further, as shown in fig. 2, a product b of a distance b between a side of the color conversion layer away from the substrate 10 and a tangent tan (θ) of a half angle θ of the light emission of the corresponding light source 201 is smaller than a distance a between the corresponding light source 201 and the corresponding reflection portion 301. The light emission half angle θ of the light source 201 may be set according to requirements, and in order to achieve both light energy and illumination angle, the light emission half angle θ of the light source 201 is generally smaller than 90 °, and herein it is understood that the light emitted by the light source 201 is concentrated between (- θ) and θ. It can be understood that, according to the light emission half angle θ of the light source 201, the corresponding tangent value tan (θ) can be determined, and further, according to the distance b between the side of the color conversion portion 401 away from the substrate 10 and the substrate 10, the product b×tan (θ) can be determined, where b×tan (θ) can be understood as the minimum value of the horizontal distance required for allowing all the light rays emitted by the light source 201 to emit, based on this, the distance a between the light source 201 and the corresponding reflection portion 301 in this embodiment is set to be greater than b×tan (θ), that is, the distance a between the light source 201 and the corresponding reflection portion 301 can be greater than the minimum value of the horizontal distance required for allowing all the light rays emitted by the light source 201 to emit, that is, it can be realized, thereby contributing to the efficient white light emission of the backlight module 100.
In an embodiment, as shown in fig. 1 and 3, the backlight module 100 further includes: the plurality of dam structures 60 are located at a side of the color conversion layer away from the substrate 10 and are in one-to-one correspondence with the plurality of light sources 201, each dam structure 60 is disposed around a corresponding side portion of the light source 201, and a distance between a side of each dam structure 60 away from the substrate 10 and the substrate 10 is greater than a distance between a side of the corresponding light source 201 away from the substrate 10 and the substrate 10. Each of the dam structures 60 may include a plurality of sub-dams 601, where the plurality of sub-dams 601 are sequentially connected and surround the side portions of the light sources 201, that is, at least one sub-dam 601 is disposed between two adjacent light sources 201, that is, in the top view, the plurality of dam structures 60 are distributed in a grid shape to separate two adjacent light sources 201. Specifically, the reflectance of the dam structure 60 may be 90% to 99%, for example, the dam structure 60 may be made of a material doped with titanium dioxide and color conversion particles in a silicone gel, the color conversion particles may be described above with reference to the related description, the thickness of the dam structure 60 may be 0.2 mm to 1 mm, and further, the side of the dam structure 60 away from the substrate 10 may contact the light guiding reflective layer 70.
In connection with the above discussion, the dam structure 60 surrounding the side of the light source 201 and the first light guiding reflective part 701 above the light source 201 in this embodiment may form a corresponding microcavity. It can be appreciated that, on the one hand, the dam structure 60 can block the adjacent two light sources 201 from interfering with each other so as to reduce the risk of uneven light emission of the backlight module 100; on the other hand, the dam structure 60 has high reflectivity, and can reflect the light emitted by the light source 201 towards the adjacent light source 201 into the corresponding microcavity for reuse; in yet another aspect, the color conversion particles are doped in the dam structure 60, so that the light emitted from the light source 201 towards the adjacent light source 201 can be subjected to color conversion treatment, which is beneficial to the formation of white light.
In an embodiment, as shown in fig. 1, the backlight module 100 further includes: and the encapsulation adhesive layer 50 is positioned on one side of the light sources 201 away from the substrate 10 and one side of the color conversion layer away from the substrate 10, and the encapsulation adhesive layer 50 is transparent. The encapsulation adhesive layer 50 may be, but not limited to, made of transparent adhesive, and further, on the basis of the light guiding reflective layer 70, the encapsulation adhesive layer 50 may be filled between the substrate 10 and the light guiding reflective layer 70, that is, between the adjacent light source 201 and the reflective portion 301, and between the adjacent light source 201 and the color conversion portion 401, and the encapsulation adhesive layer 50 is also filled, because the encapsulation adhesive layer 50 is transparent, it can be considered that the light transmittance is hardly affected.
Specifically, as shown in table 1, to obtain the young's modulus of the encapsulation adhesive layer 50 corresponding to different materials, it can be seen from the observation of table 1 that the young's modulus of the encapsulation adhesive layer 50 corresponding to the undoped transparent adhesive film is the smallest, and the young's modulus corresponding to the undoped transparent adhesive film is increased when the transparent adhesive film is doped with the diffusion particles or the fluorescent powder, and the young's modulus corresponding to the doped fluorescent powder is also increased along with the increase of the doping ratio of the fluorescent powder. It should be noted that, since the color conversion layer is disposed on the reflective layer in the present invention, any of the diffusion particles and the fluorescent powder doped in the encapsulation adhesive layer 50 can be avoided to realize the function of the color conversion layer; therefore, the young's modulus of the encapsulation adhesive layer 50 of the present invention can be greatly reduced relative to the doped diffusion particles and the phosphor, and, in combination with the above discussion, the multiplexing reflective layer of the present invention is used as a substrate, so that the thickness of the color conversion layer can be smaller, and the larger thickness of the backlight module 100 is avoided, which is beneficial to the development of flexibility of the liquid crystal display panel including the backlight module 100.
TABLE 1
| Packaging adhesive layer material | Young's modulus (E/MPa) |
| Undoped transparent adhesive film | 24.32 |
| Transparent adhesive film doped with 20% diffusion particles | 25.65 |
| Transparent adhesive film doped 20% fluorescent powder | 42.56 |
| Transparent adhesive film doped with 25% fluorescent powder | 56.50 |
Further, the refractive index of the encapsulation adhesive layer 50 may be 1.3 to 1.5, and the encapsulation adhesive layer 50 with a lower refractive index is beneficial to the divergence of light, so as to fully mix the light with different colors to form white light; the distance between the side of the encapsulation adhesive layer 50 away from the substrate 10 and the substrate 10 may be greater than the distance between the side of the dam structure 60 away from the substrate 10 and the substrate 10, which is advantageous for planarization of the side of the encapsulation adhesive layer 50 away from the substrate 10, for example, the thickness of the encapsulation adhesive layer 50 may be 0.25 mm to 1.05 mm.
Specifically, referring to the schematic view of the manufacturing scenario shown in fig. 4, the backlight module 100 of the present invention may be manufactured by the following steps, including but not limited to the following steps.
S1, providing a substrate, and forming a plurality of light sources on the substrate.
The substrate 10 may be a flexible substrate, for example, the substrate 10 may be made of at least one material including, but not limited to, a material identical to a flexible circuit board substrate, a material identical to a printed circuit board substrate, and polyimide, so that the substrate 10 has ultra-thin flexible performance. The light source 201 may be, but not limited to, a mini LED (sub millimeter light emitting diode) or a micro LED (micro light emitting diode), and the color of light that the light source 201 may emit may be blue. Specifically, the plurality of light sources 201 may be formed by performing a soldering and die bonding operation on the substrate 10, and by a reflow process.
S2, forming a reflecting layer and a color conversion layer on the substrate, wherein the reflecting layer comprises a plurality of reflecting parts, a light source is arranged between every two adjacent reflecting parts, the color conversion layer comprises a plurality of color conversion parts corresponding to the reflecting parts one by one, and each color conversion part is positioned on one side, away from the substrate, of the corresponding reflecting part.
The reflectivity of the reflective portion 301 may be 90% to 99%, for example, the reflective layer may be made of a material including but not limited to titanium dioxide doped in a resin, wherein the resin may be, but not limited to acryl, and the color conversion portion 401 may be made of a material including but not limited to at least one of fluorescent powder, QD quantum dots, and organic dye doped in glue. Specifically, the reflective portions 301 may be formed on the substrate 10 by applying, and adjacent light sources 201 and reflective portions 301 may be disposed at intervals in a para-position manner, so as to enable light generated on a side of the light source 201 opposite to the corresponding reflective portion 301 to be incident on the corresponding second light guiding reflective portion 702 for use.
S3, forming a plurality of box dam structures corresponding to the plurality of color conversion parts one by one on one side, away from the substrate, of the color conversion layer, wherein each box dam structure is arranged around the side part of the corresponding light source, and the distance between one side, away from the substrate, of each box dam structure and the substrate is larger than the distance between one side, away from the substrate, of the corresponding light source and the substrate.
Each of the dam structures 60 may include a plurality of sub-dams 601, where the plurality of sub-dams 601 are sequentially connected and surround the side portions of the light sources 201, that is, at least one sub-dam 601 is disposed between two adjacent light sources 201, that is, in the top view, the plurality of dam structures 60 are distributed in a grid shape to separate two adjacent light sources 201. Specifically, the reflectance of the dam structure 60 may be 90% to 99%, for example, the dam structure 60 may be made of a material doped with titanium dioxide and color conversion particles in a silicone gel, the color conversion particles may be described above with reference to the related description, the thickness of the dam structure 60 may be 0.2 mm to 1 mm, and further, the side of the dam structure 60 away from the substrate 10 may contact the light guiding reflective layer 70. Specifically, the plurality of dam structures 60 may be fabricated by, but not limited to, a glue-spraying process.
S4, forming a packaging adhesive layer on one side of the plurality of light sources, which is far away from the substrate, and one side of the color conversion layer, which is far away from the substrate, wherein the packaging adhesive layer is transparent.
The encapsulation adhesive layer 50 may be, but not limited to, made of transparent adhesive, and further, on the basis of the light guiding reflective layer 70, the encapsulation adhesive layer 50 may be filled between the substrate 10 and the light guiding reflective layer 70, that is, between the adjacent light source 201 and the reflective portion 301, and between the adjacent light source 201 and the color conversion portion 401, and the encapsulation adhesive layer 50 is also filled, because the encapsulation adhesive layer 50 is transparent, it can be considered that the light transmittance is hardly affected. Specifically, the encapsulating adhesive layer 50 may be manufactured by, but not limited to, spraying, molding or coating to encapsulate the plurality of light sources 201.
S5, forming a light guide reflection layer on one side of the packaging adhesive layer far away from the substrate, wherein the light guide reflection layer is provided with a plurality of open holes.
Wherein the thickness of the light guiding reflective layer 70 may be 0.1 to 10 micrometers, and the reflectivity of the light guiding reflective layer 70 may be 60 to 99%, for example, the light guiding reflective layer 70 may be made of metal or organic matter, wherein the metal may include, but is not limited to, aluminum, silver, and the organic matter may refer to the above description of the constituent materials of the reflective layer, and further, the light transmittance of the light guiding reflective layer 70 may be set lower to block light from exiting the light guiding reflective layer 70. The patterned light guiding reflective layer 70 may be manufactured by, but not limited to, a yellow light process or a 3D printing process.
The invention provides a display panel, which comprises a liquid crystal panel and the backlight module, wherein the liquid crystal panel and the backlight module are combined into a whole.
The invention provides a backlight module and a display panel, comprising: a substrate; a plurality of light sources located on the substrate; the reflecting layer is positioned on the substrate and comprises a plurality of reflecting parts, and the light source is arranged between two adjacent reflecting parts; the color conversion layer is positioned on one side of the reflecting layer away from the substrate and used for converting the color of light rays emitted by the light source, and comprises a plurality of color conversion parts which are in one-to-one correspondence with the reflecting parts, and the corresponding light source is arranged between every two adjacent color conversion parts. The color conversion layer for converting the color of the light emitted by the light source is arranged on one side of the reflecting layer far away from the substrate, and the reflecting layer can be reused as a substrate, so that the thickness of the color conversion layer can be set smaller, the thickness of the backlight module is reduced, and meanwhile, the situation that the color conversion layer with larger thickness is independently manufactured above the light source or the situation that a packaging adhesive layer with larger Young modulus is formed by doping diffusion particles or fluorescent powder in a transparent adhesive film is avoided, and the color conversion layer with smaller thickness is formed is facilitated, so that the flexible development of the liquid crystal display panel comprising the backlight module is facilitated.
The backlight module and the display panel provided by the embodiment of the invention are described in detail, and specific examples are applied to explain the principle and the implementation mode of the invention, and the description of the above embodiment is only used for helping to understand the technical scheme and the core idea of the invention; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A backlight module, comprising:
a substrate;
a plurality of light sources located on the substrate;
the reflecting layer is positioned on the substrate and comprises a plurality of reflecting parts, and the light source is arranged between two adjacent reflecting parts;
the color conversion layer is positioned on one side of the reflecting layer, far away from the substrate, and is used for converting the color of light rays emitted by the light source, and comprises a plurality of color conversion parts which are in one-to-one correspondence with the plurality of reflecting parts, and the corresponding light source is arranged between two adjacent color conversion parts;
wherein adjacent light sources and the reflecting part are arranged at intervals;
and the product of the distance between one side of the color conversion layer away from the substrate and the tangent value of the luminous half angle of the corresponding light source is smaller than the distance between the corresponding light source and the corresponding reflecting part.
2. A backlight module according to claim 1, further comprising:
the light guide reflection layer is positioned at one side of the light sources far away from the substrate and one side of the color conversion layer far away from the substrate, and is provided with a plurality of open holes.
3. The backlight module according to claim 2, wherein the light guiding reflective layer comprises a first light guiding reflective portion disposed opposite to the light source, and a second light guiding reflective portion disposed opposite to the reflective portion;
wherein the density of the openings in the first light guiding reflective portion is less than the density of the openings in the second light guiding reflective portion.
4. The backlight module according to claim 1, wherein the thickness of the color conversion layer is smaller than the thickness of the reflection layer.
5. A backlight module according to claim 1 or 2, wherein the distance between the side of the light source away from the substrate and the substrate is greater than the distance between the side of the color conversion layer away from the substrate and the substrate.
6. A backlight module according to claim 1, further comprising:
the packaging adhesive layer is positioned on one side of the light sources, which is far away from the substrate, and one side of the color conversion layer, which is far away from the substrate, and is transparent.
7. A backlight module according to claim 1, further comprising:
the plurality of box dam structures are positioned on one side, far away from the substrate, of the color conversion layer and correspond to the plurality of light sources one by one, each box dam structure is arranged around the corresponding side part of the light source, and the distance between one side, far away from the substrate, of each box dam structure and the substrate is larger than the distance between one side, far away from the substrate, of the corresponding light source and the substrate.
8. A display panel, comprising a liquid crystal panel and a backlight module according to any one of claims 1 to 7, wherein the liquid crystal panel and the backlight module are combined into a single body.
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| CN202210247925.0A CN114527603B (en) | 2022-03-14 | 2022-03-14 | Backlight module and display panel |
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| CN202210247925.0A CN114527603B (en) | 2022-03-14 | 2022-03-14 | Backlight module and display panel |
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| US7731377B2 (en) * | 2006-03-21 | 2010-06-08 | Semiconductor Energy Laboratory Co., Ltd. | Backlight device and display device |
| US20190041701A1 (en) * | 2017-08-01 | 2019-02-07 | Innolux Corporation | Display device |
| CN109946874A (en) * | 2017-12-20 | 2019-06-28 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| KR102711189B1 (en) * | 2019-11-15 | 2024-09-30 | 엘지디스플레이 주식회사 | Back light unit and display device using the same |
| CN113156703A (en) * | 2021-04-22 | 2021-07-23 | 深圳市华星光电半导体显示技术有限公司 | Backlight module and quantum dot display device |
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