CN111095088A - Backlight module and display device - Google Patents
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- CN111095088A CN111095088A CN201880001731.4A CN201880001731A CN111095088A CN 111095088 A CN111095088 A CN 111095088A CN 201880001731 A CN201880001731 A CN 201880001731A CN 111095088 A CN111095088 A CN 111095088A
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Abstract
The backlight module comprises a plurality of monochromatic light emitting units (300), a transparent packaging layer (400) covering the monochromatic light emitting units (300), a light intensifying layer (600) covering the packaging layer (400) and a composite functional structure (500) arranged between the packaging layer (400) and a shading layer and covering the packaging layer (400). The invention takes the monochromatic light emitting unit (300) as a light source, converts the monochromatic light into polychromatic light through the composite functional structure (500), and reflects and scatters the light before emitting, so that the using amount of the monochromatic light emitting unit (300) is reduced, and the material cost is greatly reduced; in addition, the composite function structure (500) can be combined with other optical functions besides the light conversion function, so that the thickness of the backlight module is reduced, the ultrathin design is realized, the manufacturing process is simplified, and the manufacturing cost is reduced.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a backlight module and a display device.
Background
The liquid crystal display technology is a mainstream display technology in the market at present, and has been widely applied in the fields of mobile phones, tablet computers, personal computers, televisions, vehicle-mounted displays, industrial control displays and the like. The liquid crystal itself does not have the function of emitting light, so a backlight module is usually used to provide backlight for the liquid crystal. As is well known, the backlight module mainly uses a Light Emitting Diode (LED) as a Light source, and is formed by separating and combining multiple optical film structures such as a Light guide plate, a diffusion film, and a Light-enhancing layer, which are closely arranged in sequence. The structural form mainly comprises a lateral type and a direct type.
Specifically, in the example of the side-in type backlight module, the white LED light source is located on one side or two sides around the light guide plate, and light enters the light guide plate from the side, exits from the upper surface of the light guide plate after being guided by the light guide plate, and then sequentially enters the diffusion film and the light enhancement layer, and finally irradiates on the liquid crystal module. However, although the light source is disposed at the side edge of the side-in backlight module to ensure a thin overall thickness, the light guiding distance is too long, which easily results in large power consumption and low light utilization rate, wherein the light utilization rate is generally less than 50%. In addition, the liquid crystal display assembled by the lateral backlight module has the defects of low contrast ratio, low screen occupation ratio, difficult processing of special-shaped screens and the like.
Correspondingly, in the case of the direct-type backlight module, the diffusion film is disposed above the white LED, and the light sequentially enters the diffusion film and the light-enhancing layer and finally irradiates the liquid crystal module. However, the direct type backlight module is usually designed by a multi-layer film structure, so that the overall thickness of the backlight module is easily increased. In addition, although the direct type backlight module basically has no problems in the side type backlight module, the direct type backlight module has the defects of large quantity of LEDs, poor light color uniformity, complex manufacturing process, high production cost, low production efficiency, low yield and the like.
Disclosure of Invention
The invention aims to: the backlight module is used for solving the technical problems of thicker thickness, more luminous sources, poor light mixing uniformity, high production cost, low yield and the like of the backlight module.
In order to solve the technical problems, the invention adopts the technical scheme that:
the backlight module comprises a circuit board, a plurality of monochromatic light-emitting units arranged on the circuit board, a transparent packaging layer covering the monochromatic light-emitting units, and a light-adding layer and a light-shielding layer which are sequentially covered right above the packaging layer; the backlight module further comprises:
the composite functional structure at least has a light conversion function, is arranged between the packaging layer and the light enhancement layer and covers the packaging layer, realizes a light mixing function through reflection, and converts monochromatic light emitted by the monochromatic light emitting unit into polychromatic light to be emitted;
the distance between two adjacent single-color light-emitting units is greater than or equal to 1.5 mm; the total thickness of the backlight module can be less than 0.8 mm.
The backlight module provided by the embodiment of the invention comprises a plurality of monochromatic light-emitting units arranged on a circuit board, a transparent packaging layer covering the monochromatic light-emitting units, a light-adding layer and a light-shielding layer which are sequentially covered right above the packaging layer, and a composite functional structure which is arranged between the packaging layer and the light-shielding layer and covers the packaging layer. The embodiment of the invention adopts the monochromatic light emitting units as the light source, and finally converts monochromatic light (such as blue light) emitted by the monochromatic light emitting units into polychromatic light (such as white light) by applying the light conversion function of the composite function structure to emit the polychromatic light, and importantly, the light before emitting can be reflected and scattered by the composite function structure, so that the light color uniformity is improved, the distance between two adjacent monochromatic light emitting units is ensured to be more than or equal to 1.5mm, the use number of the monochromatic light emitting units is favorably reduced, and the material cost is greatly reduced;
in addition, the composite functional structure can have other optical functions besides the light conversion function, namely, the composite functional structure can be combined with various optical functions, so that various optical film layers are favorably saved, the total thickness of the backlight module can be ensured to be less than 0.8mm, the thickness of the backlight module is greatly reduced, the ultrathin design of the backlight module is favorably realized under the condition that the display effect meets the requirement, the manufacturing process is simplified, and the manufacturing cost is saved.
The invention aims to: the display device is used for solving the technical problems that the display effect of a display product is poor, the ultra-thin design is difficult to realize, the material cost is high, the production cost is high and the production efficiency is low.
In order to solve the technical problems, the invention adopts the technical scheme that:
still provide a display device, this display device includes foretell backlight unit.
According to the display device provided by the embodiment of the invention, by adopting the backlight module, the display uniformity is improved, the overall thickness is reduced, the ultrathin design is favorably realized, the material cost is reduced, the production cost is reduced, and the production efficiency is improved.
Drawings
To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description 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 view illustrating a first exemplary embodiment of a backlight module according to the present invention;
FIG. 2 is a schematic cross-sectional view illustrating a second exemplary embodiment of a backlight module according to the invention;
FIG. 3 is a schematic cross-sectional view illustrating a backlight module according to a third embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view illustrating a backlight module according to a second embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view illustrating a backlight module according to a third embodiment of the present invention;
fig. 6 is a schematic cross-sectional view illustrating a backlight module according to a fourth embodiment of the invention.
Wherein the reference numbers in the drawings are as follows:
100-outer frame, 200-circuit board, 300-monochromatic light-emitting unit, 400-packaging layer;
500-composite functional structure, 510-composite light mixing film, 511-first optical film layer, 512-light mixing functional layer and 5211-light mixing element; 520-composite optical film, 521-light conversion layer, 522-light concentration layer;
530-composite light-mixing optical film, 531-second optical film layer, 532-light-mixing functional layer, 533-light conversion layer and 534-light-condensing layer; 540-a third optical film layer;
600-light enhancing layer and 700-light shielding layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the patent. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
In order to explain the technical solution of the present invention, the following detailed description is made on the implementation of a backlight module according to the present invention with reference to the specific drawings and embodiments.
It should be noted that the backlight module is mainly used in a direct-type backlight display device, and certainly, the backlight module can also be used in other suitable structures or products.
In the present invention, as shown in fig. 1 to 6, the backlight module includes a circuit board 200, a monochromatic light emitting unit 300, an encapsulation layer 400, a light-adding layer 600, a light-shielding layer 700, and a composite functional structure 500. Generally, the outer frame 100 is provided at an outer side of the circuit board 200 to facilitate protection of the circuit board 200 and mounting of parts. The circuit board 200 may be a flexible circuit board 200, or may be another type of circuit board 200. The single-color light emitting unit 300 has a plurality, and each single-color light emitting unit 300 is disposed on the circuit board 200. The single-color Light Emitting unit 300 may be a single-color Light Emitting Diode (LED) chip, a single-color Laser Diode (LD) chip, or other suitable Light Emitting elements. Specifically, in the present invention, the single-color light emitting unit 300 is one of a blue LED chip, a violet LED chip, or an ultraviolet LED chip.
As shown in fig. 1 to 6, the encapsulation layer 400 covers the single-color light emitting unit 300 to encapsulate and protect the single-color light emitting unit 300. To facilitate light transmission, the encapsulation layer 400 is transparent. Specifically, in the present invention, the light transmittance of the encapsulation layer 400 is greater than or equal to 90%, which is beneficial to improving the overall brightness and the utilization rate of the light source; the encapsulation layer 400 is generally made of a resin material or a silicone material, which is advantageous for reducing the production cost.
As further shown in fig. 1-6, the light-enhancing layer 600 covers the top of the packaging layer 400, so as to enhance the light emitted from the composite functional structure 500. It should be noted that, in the present invention, the light-adding layer 600 is a common light-adding film for increasing brightness, and of course, the light-adding layer 600 may be a single-layer light-adding layer, a multi-layer light-adding combination layer, or a combined layer structure with multi-layer light-adding and diffusion functions, and may be determined according to the actual brightness requirement; correspondingly, the light-shielding layer 700 covers the encapsulation layer 400, and usually the light-shielding layer 700, the light-enhancing layer 600 and the encapsulation layer 400 are sequentially disposed to cover up and down. Specifically, the light shielding layer 700 is an adhesive layer formed by black light shielding glue, and may be used in the ultra-narrow bezel structure, and in fact, the light shielding layer 700 may also be of another suitable structure or made of another suitable material.
As further shown in fig. 1 to 6, the composite functional structure 500 is disposed between the encapsulation layer 400 and the light-adding layer 600, and covers the encapsulation layer 400. Thus, between the package layer 400 and the light-adding layer 600, the composite functional structure 500 can implement a light mixing function by reflecting and scattering the passing light, so as to improve the uniformity of light color and the display effect, and further facilitate the reduction of the distance between the single-color light-emitting units 300. In the invention, the distance between two adjacent single-color light-emitting units 300 is more than or equal to 1.5mm, so that the use number of the single-color light-emitting units 300 is conveniently and greatly reduced, thereby greatly saving raw materials and reducing the cost of the backlight module.
In addition, the composite functional structure 500 has at least a light conversion function. In the present invention, the backlight module can finally convert the monochromatic light emitted from the monochromatic light emitting unit 300 into the polychromatic light and emit the polychromatic light through the light conversion function of the composite functional structure 500. It is understood that the composite functional structure 500 may be combined with various optical functions, such as a light condensing function, a light diffusing function, a light condensing function and a light diffusing function, in addition to the light converting function. Therefore, various optical film layers are favorably omitted, and the total thickness of the backlight module is reduced.
In the invention, the total thickness of the backlight module can reach less than 0.8mm, obviously, compared with the common direct type backlight module, the total thickness of the backlight module is greatly reduced, the ultrathin design of the backlight display product is realized under the condition that the display effect meets the requirement, correspondingly, the manufacturing process is simplified, the yield is improved, the manufacturing cost is saved, and the market competitiveness of the backlight module and the display product using the backlight module is improved.
It should be noted that the backlight module can keep the thickness of the direct type backlight module within the thickness range of the existing side type backlight module with the same size, and greatly reduce the cost of the direct type backlight module. It should be noted that, in practical applications, the distance between two adjacent single-color light emitting units 300 may be different according to different sizes or different applications of the backlight module, and the specific size or application of the backlight module corresponds to the total thickness, which can be seen from table 1:
| display backlight application | Single color light emitting cell pitch | Thickness of package layer | Total thickness of backlight |
| Mobile phone | 1.50mm～4mm | <0.3mm | <0.8mm |
| Tablet personal computer and vehicle-mounted display | 1.50mm～5mm | <0.6mm | <1.2mm |
| Notebook computer | 1.50mm～5mm | <0.8mm | <2.5mm |
| Computer display | 1.50mm～7mm | <1.2mm | <4mm |
| TV | 1.50mm～20mm | <3mm | <5mm |
As is apparent from table 1, in a common display product, such as a mobile phone, the total thickness of the backlight module can be less than 0.8 mm. In addition, in each display product, the distance between two adjacent monochromatic light emitting units 300 is greater than 1.5mm, so that the total thickness of the backlight module is greatly reduced, and the distance between two adjacent monochromatic light emitting units 300 is also greatly enlarged, thereby greatly reducing the material cost.
In the first embodiment of the present invention, as shown in fig. 1 to 3, the composite functional structure 500 includes a composite light mixing film 510 and a composite optical film 520. The composite optical film 520 and the composite light mixing film 510 are in an up-and-down covering relationship between the packaging layer 400 and the light-adding layer 600. In other words, between the package layer 400 and the light-adding layer 600, the composite functional structure 500 is mainly formed by covering and combining the composite optical film 520 and the composite light mixing film 510 up and down, and the specific up-down position relationship can be determined according to the actual requirement.
In the present embodiment, as shown in fig. 1 to fig. 3, the composite light mixing film 510 includes a first optical film layer 511 and a light mixing function layer 512. The first optical film layer 511 may be an optical base film (not shown) having an optical function. Generally, the optical base film may be any one of a Polyethylene terephthalate (PET) film, an acrylic (acrylics) film, a Polycarbonate (PC) film, a diffusion film, a brightness enhancement film, or a fluorescent film. Of course, in practice, other functional films may be used. Correspondingly, the first optical film layer 511 may also be a composite optical film material having multiple optical functions. The composite optical film 520 may be formed by combining at least two kinds of film materials such as a PET film, a PC film, a diffusion film, a brightness enhancement film, and a fluorescent film.
As is apparent from the above description, the composite light mixing film 510 may have other optical functions as well as the light mixing function. In particular, in practical application, the optical base films with different functions can be selected according to actual needs to design the composite light mixing film 510, so that some film materials with the same functions can be omitted by adopting the composite light mixing film 510, thereby realizing ultrathin design, saving raw materials and reducing production cost.
As shown in fig. 1 to 3, the light-mixing functional layer 512 is disposed on the surface and/or inside the first optical film layer 511. It is understood that in the composite light mixing film 510, the light mixing function layer 512 is provided with at least one layer, and the specific number of layers can be determined according to actual needs. For convenience of description, the present invention will be described mainly with reference to the case of one light mixing function layer 512. In addition, the light-mixing functional layer 512 is provided with a light-homogenizing surface for enhancing reflection and scattering of light. Specifically, the reflectivity of the light homogenizing surface ranges from 50% to 100%, and the transmissivity ranges from 0% to 50%. Like this, light shines most can be reflected and the scattering after on this even light surface, promptly, this compound membrane of mixing light 510 is under the prerequisite of guaranteeing light utilization ratio, mainly through the reflection and the scattering realization light luminance and the homogenization of colourity to light, and even light effect obtains showing and improves, does benefit to and realizes even mixed light under the great condition of interval at ultrashort distance and monochromatic luminescence unit 300. Obviously, compared with the conventional light guide sheet, light homogenizing sheet and other film materials, the composite light mixing film 510 belongs to a new film material with a light homogenizing function, and has a simple structure and a simple forming process.
It should be noted that the dodging surface is a reflecting surface, and may be a high-reflection mirror surface or a high-reflection scattering surface. Wherein the reflecting surface is formed by an opaque reflecting layer in which a plurality of light mixing elements 5211 are laid out. In addition, the light mixing element 5211 is mainly formed by at least one structure or pattern of a dot, a concave-convex structure, a filling or a stripe, and is mainly used for reflecting polychromatic light or monochromatic light. Specifically, taking one of the light mixing elements 5211 as a dot as an example, the light homogenizing surface may be formed by arranging all the dot structures, may also be formed by arranging all the dot patterns, may also be formed by arranging a part of the dot structures and another part of the dot patterns in a mixed manner, and may also be formed by arranging a part of the dot structures, a part of the concave-convex structures, a part of the stripe patterns in a mixed manner, and the like. Of course, in practice, the light mixing elements 5211 may also be other suitable structures or patterns that act as light evening devices. In addition, to achieve better light mixing effect, the light mixing elements 5211 are generally uniformly arranged.
In the present embodiment, as shown in fig. 1 to fig. 3, in order to improve the light uniformizing effect, the light mixing function layer 512 is generally located right above the single-color light emitting unit 300, and the arrangement density of the light mixing elements 5211 is inversely related to the distance between the light mixing elements 5211 and the single-color light emitting unit 300. In other words, the closer to the position of the monochromatic light emitting unit 300, the more dense the arrangement of the light mixing elements 5211 is, and the farther from the position of the monochromatic light emitting unit 300, the more sparse the arrangement of the light mixing elements 5211 is.
Correspondingly, as shown in fig. 1 to 3, the composite optical film 520 includes a light conversion function structure, wherein the light conversion function structure at least has a light conversion function, so as to ensure that the composite optical film 520 at least has the light conversion function. It is understood that the composite optical film 520 is mainly used to convert the monochromatic light emitted from the monochromatic light emitting unit 300 into the polychromatic light and emit the polychromatic light, and the composite optical film 520 may have various other optical functions in addition to the light conversion function, for example, the composite optical film 520 may have the light conversion function and the light diffusion function, or may have the light conversion function and the light condensation function, or may have the light conversion function, the light diffusion function, the light condensation function, and the like. Of course, the "other optical functions" referred to herein are not limited to the light diffusing function and/or the light condensing function, and may include, for example, a light intensifying function of a light intensifying film, a reflecting function of a reflecting film, a polarizing function of a polarizing film, a filtering function of a filter film, and the like. Obviously, after the backlight module uses the composite optical film 520, the fluorescent glue for packaging the monochromatic light-emitting unit 300 can be directly replaced by the transparent packaging glue, and on the basis, other optical films with the same function as other optical functions of the composite optical film 520 can be omitted. For example, the composite optical film 520 has a light diffusion function in addition to a light conversion function, and after the composite optical film 520 is used, the backlight module can also omit a diffusion film having a light diffusion function, thereby being beneficial to greatly reducing the thickness of the backlight module.
It should be noted that, in the present invention, the light conversion function structure is mainly used to convert the received monochromatic light into the color light with a color different from that of the monochromatic light, and mix the color light and the monochromatic light transmitted through the light conversion function structure into the multi-color light to be emitted. That is, monochromatic light is penetrated to the light conversion function structure and is received the back, and partly monochromatic light can directly see through the light conversion function structure, and another part monochromatic light is directly converted into the different colour light with monochromatic light colour by the light conversion function structure simultaneously, like this, the colour light that sees through in the light conversion function structure and monochromatic light can finally mix into compound light and jet out from the light conversion function structure. Taking monochromatic light as blue light as an example, a part of the blue light directly penetrates through the light conversion functional structure, and another part of the blue light can be converted into yellow light by the light conversion functional structure, so that the blue light and the yellow light penetrating through the light conversion functional structure can be finally mixed into white light to be emitted from the light conversion functional structure. Therefore, the backlight module does not need to directly adopt a white light source as a backlight source, and the structure diversification of the backlight module is favorably realized.
Or, the light conversion function structure is mainly used for converting the received monochromatic light into first composite light with various colors or wavelengths and mixing the first composite light with the monochromatic light penetrating through the light conversion function structure into second composite light to be emitted. Therefore, a new backlight product capable of emitting light rays with different colors or wavelengths simultaneously can be manufactured, a plurality of single-color light emitting elements are not required to be assembled, and the structure of the backlight product is simplified.
In the first embodiment of this embodiment, as shown in fig. 1, the composite optical film 520, the composite light mixing film 510 and the encapsulating layer 400 are sequentially disposed to cover up and down. Specifically, as shown in fig. 1, the light-mixing functional layer 512 is disposed on the outer surface of the first optical film layer 511 and abuts against the encapsulation layer 400. The light conversion functional structure includes a light conversion layer 521 and a light concentration layer 522. The light conversion layer 521 is disposed on the first optical film layer 511, and the light-condensing layer 522 is disposed on the exit surface of the light conversion layer 521. More specifically, the light enhancement layer 600, the light collection layer 522, the light conversion layer 521, the first optical film layer 511, the light mixing functional layer 512 and the encapsulation layer 400 are sequentially covered from top to bottom.
Therefore, in this embodiment, taking the monochromatic light emitting unit 300 as a blue LED chip as an example, the blue light emitted by the monochromatic light emitting unit 300 is transmitted through the package layer 400, and then incident on the composite light mixing film 510, and reflected back by the light mixing function layer 512 in the composite light mixing film 510, and then is uniformly mixed by repeatedly reflecting and scattering, and finally, after the homogenized blue light reaches the composite optical film 520, the blue light is converted into yellow light by the light conversion layer 521 of the composite optical film 520, and the yellow light and the blue light transmitted through the light conversion layer 521 are combined into white light, and then the white light is condensed by the light condensing layer 522 and the light intensifying layer 600 in the composite optical film 520, and finally, the white light is vertically incident on the liquid crystal in the liquid crystal cell to realize display.
In the second embodiment of this embodiment, as shown in fig. 2, unlike the first embodiment, the composite light mixing film 510 and the composite optical film 520 are vertically reversed, that is, the composite light mixing film 510, the composite optical film 520 and the encapsulation layer 400 are sequentially disposed in a vertically covering manner. Specifically, as shown in fig. 2 again, the light conversion functional structure includes a light conversion layer 521 and a light condensing layer 522. The light conversion layer 521 is disposed on the encapsulation layer 400, and the light collection layer 522 is disposed on the exit surface of the light conversion layer 521. Correspondingly, one side of the first optical film layer 511 of the composite light mixing film 510 is disposed on the light enhancement layer 600, and the other side abuts against the light collection layer 522. The light mixing function layer 512 of the composite light mixing film 510 is disposed on the inner surface of the first optical film layer 511 on the side close to the light conversion layer 521. It can be understood that, as shown in fig. 2, the light enhancement layer 600, the first optical film layer 511, the light mixing function layer 512, the light condensing layer 522, the light conversion layer 521 and the encapsulation layer 400 are sequentially covered from top to bottom, and the light mixing function layer 512 is embedded in the first optical film layer 511.
Therefore, in this embodiment, taking the monochromatic light emitting unit 300 as a blue LED chip as an example, the blue light emitted by the monochromatic light emitting unit 300 is transmitted through the package layer 400 and then enters the composite optical structure, wherein the blue light is first converted into yellow light on the light conversion layer 521, the yellow light and the blue light transmitted through the light conversion layer 521 are combined into white light, then the white light is condensed by the light condensing layer 522 to reach the composite light mixing film 510, and is reflected by the light mixing function layer 512 in the composite light mixing film 510, and the white light can be uniformly mixed by repeatedly reflecting and scattering, and finally, the homogenized white light is condensed by the light increasing layer 600 and then vertically enters the liquid crystal in the liquid crystal box to realize display.
In the third embodiment of this embodiment, as shown in fig. 3, unlike the second embodiment, although the composite light mixing film 510, the composite optical film 520 and the encapsulation layer 400 are still sequentially disposed to cover up and down in this embodiment, the light conversion function structure of the composite optical film 520 is changed. Specifically, as shown in fig. 3, the light conversion functional structure includes a light-condensing layer 522 and a light-converting layer 521, wherein the light-condensing layer 522 is disposed on the encapsulation layer 400, and the light-converting layer 521 is disposed on a light-emitting surface of the light-condensing layer 522. Correspondingly, one side of the first optical film layer 511 of the composite light mixing film 510 is disposed on the light enhancement layer 600, and the light mixing function layer 512 of the composite light mixing film 510 is disposed on the outer surface of the other side of the first optical film layer 511. It can be understood that, as shown in fig. 3, the light enhancement layer 600, the first optical film layer 511, the light mixing functional layer 512, the light conversion layer 521, the light condensation layer 522 and the encapsulation layer 400 are sequentially covered from top to bottom, and the light mixing functional layer 512 is externally disposed on the first optical film layer 511.
It can be understood that, unlike the second embodiment, in this embodiment, taking the single-color light emitting unit 300 as an example of a blue LED chip, the blue light incident on the composite optical structure is first condensed by the light condensing layer 522, and then converted into yellow light by the light conversion layer 521, and the yellow light and the blue light transmitted through the light conversion layer 521 are combined into white light to directly reach the composite light mixing film 510.
In the second embodiment of the present invention, as shown in fig. 4, the main technical features of the present embodiment are substantially the same as those of the first embodiment, and are not described herein again, wherein the main differences between the present embodiment and the first embodiment are as follows:
the composite functional structure 500 includes a composite light mixing optical film 530. One side of the composite light-mixing optical film 530 is disposed on the light-enhancing layer 600, and the other side is disposed on the package layer 400. That is, different from the first embodiment, the present embodiment directly compounds the composite light mixing film 510 and the composite optical film 520 into a composite light mixing optical film 530, so that the thickness of the backlight module can be further reduced, and the realization of the ultra-thin design is facilitated. It is understood that the composite light-mixing optical film 530 has at least a light-mixing function, a light-converting function, and a light-condensing function.
As shown in fig. 4, the composite light-mixing optical film 530 includes a second optical film layer 531, a light-mixing functional layer 532, a light conversion layer 533, and a light-condensing layer 534 sequentially disposed from bottom to top. Specifically, the light mixing function layer 532 is disposed on the surface and/or inside the second optical film layer 531, and is provided with a light homogenizing surface for enhancing the reflection and scattering of light. Specifically, the reflectivity of the light homogenizing surface ranges from 50% to 100%, and the transmissivity ranges from 0% to 50%. Thus, most of the light irradiated on the uniform surface can be reflected and scattered, so that the composite light mixing optical film 530 can realize the uniformity of the brightness and the chromaticity of the light mainly through the reflection and the scattering of the light on the premise of ensuring the light utilization rate, and is favorable for improving the light color uniformity under the conditions of ultra-short distance and larger distance between the monochromatic light emitting units 300. As shown in fig. 4, the light conversion layer 533 is disposed on the light emitting surface of the second optical film 531. The light-condensing layer 534 is disposed on the light-emitting surface of the light-converting layer 533, and disposed on the light-enhancing layer 600.
In this embodiment, the second optical film layer 531 may be the same as or different from the first optical film layer 511. The second optical film layer 531 may be an optical base film having one optical function, or may be a composite optical function film having a plurality of optical functions, and the second optical film layer 531 may be formed by laminating at least one of film materials such as a PET film, a PC film, a diffusion film, a brightness enhancement film, and a fluorescent film.
In the third embodiment of the present invention, as shown in fig. 5, the main technical features of the present embodiment are substantially the same as those of the first embodiment, and are not described herein again, wherein the main differences between the present embodiment and the first embodiment are as follows:
the composite functional structure 500 includes a third optical film layer 540 and a composite light-mixing optical film 530. As further shown in fig. 5, the third optical film layer 540 is disposed on the package layer 400. One side of the composite light-mixing optical film 530 is disposed on the light-enhancing layer 600, and the other side is disposed on the package layer 400. That is, unlike the first embodiment, in this embodiment, in addition to directly compounding the composite light mixing film 510 and the composite optical film 520 into one composite light mixing optical film 530, a third optical film layer 540 is added. The third optical film 540 is mainly used for condensing light, and the composite light-mixing optical film 530 still has at least a light-mixing function, a light-converting function, and a light-condensing function.
As shown in fig. 5, the composite light-mixing optical film 530 includes a light-condensing layer 534, a light-mixing functional layer 532, a second optical film layer 531 and a light-converting layer 533 which are sequentially covered from bottom to top. Specifically, the light-condensing layer 534 is disposed on the light-emitting surface of the third optical film layer 540. The second optical film 531 is disposed on the light emitting surface of the light-condensing layer 534. The light mixing function layer 532 is disposed on the surface and/or inside the second optical film 531, and is provided with a light homogenizing surface for enhancing the reflection and scattering of light. Wherein, the reflectivity range of the light homogenizing surface is 50-100%, and the transmissivity range is 0-50%. Thus, most of the light irradiated on the uniform surface can be reflected and scattered, so that the composite light mixing optical film 530 can realize the uniformity of the brightness and the chromaticity of the light mainly through the reflection and the scattering of the light on the premise of ensuring the light utilization rate, and is favorable for improving the light color uniformity under the conditions of ultra-short distance and larger distance between the monochromatic light emitting units 300. As shown in fig. 5, one side of the light conversion layer 533 is disposed on the light enhancement layer 600, and the other side is disposed on the light emitting surface of the second optical film layer 531.
It can be understood that, in this embodiment, taking the monochromatic light emitting unit 300 as a blue LED chip as an example, the blue light emitted by the monochromatic light emitting unit 300 passes through the encapsulation layer 400 and then enters the third optical film layer 540 to complete the primary light condensation, and then enters the composite light mixing optical film 530, and is reflected by the light mixing functional structure layer, so that the blue light can be uniformly mixed by repeatedly reflecting and scattering, after reaching the light conversion layer 533, the homogenized blue light is converted into yellow light by the light conversion layer 533, and the yellow light and the blue light passing through the light conversion layer 533 are compounded into white light, and then the white light is condensed by the light enhancement layer 600, so that the white light is finally vertically incident on the liquid crystal in the liquid crystal box to realize the display.
In the fourth embodiment of the present invention, as shown in fig. 6, the main technical features of the present embodiment are substantially the same as those of the first embodiment, and are not described herein again, wherein the main differences between the present embodiment and the first embodiment are as follows:
the composite functional structure 500 includes a composite light-mixing optical film 530, wherein one side of the composite light-mixing optical film 530 is disposed on the light-enhancing layer 600, and the other side is disposed on the package layer 400. That is, different from the first embodiment, the present embodiment directly compounds the composite light mixing film 510 and the composite optical film 520 into a composite light mixing optical film 530, so that the thickness of the backlight module can be further reduced, and the realization of the ultra-thin design is facilitated. It is understood that the composite light-mixing optical film 530 has at least a light-mixing function, a light-converting function, and a light-condensing function.
As shown in fig. 6, the composite light-mixing optical film 530 includes a light conversion layer 533, a light-mixing functional layer 532, a second optical film layer 531 and a light-condensing layer 534, which are sequentially covered from bottom to top. Specifically, the light conversion layer 533 is disposed on the encapsulation layer 400. The second optical film 531 is disposed on the light conversion layer 533. The light mixing function layer 532 is disposed on the surface and/or inside the second optical film 531, and is provided with a light homogenizing surface for enhancing the reflection and scattering of light. Wherein, the reflectivity range of the light homogenizing surface is 50-100%, and the transmissivity range is 0-50%. Thus, most of the light irradiated on the uniform surface can be reflected and scattered, so that the composite light mixing optical film 530 can realize the uniformity of the brightness and the chromaticity of the light mainly through the reflection and the scattering of the light on the premise of ensuring the light utilization rate, and is favorable for improving the light color uniformity under the conditions of ultra-short distance and larger distance between the monochromatic light emitting units 300. As shown in fig. 6, one side of the light-gathering layer 534 is disposed on the second optical film layer 531, and the other side is disposed on the light-enhancing layer 600.
It is understood that, in the present invention, the composite light mixing optical film 530 is adopted in the second, third and fourth embodiments, and the main technical features are substantially the same, but the internal structure of the composite light mixing optical film 530 is different in each embodiment, and the light processing sequence is different correspondingly.
It should be noted that in all embodiments of the present invention, one or more light diffusion sheets or light diffusion structures may be added between any two adjacent layers to further improve the uniformity of light color.
The invention also provides a display device, which comprises the backlight module and a display panel, wherein the light emitted from the backlight module is emitted to the display panel, so that the display panel can display images. The display device is mainly a liquid crystal display device, and can be a product or a component with any display function, such as a liquid crystal television, a liquid crystal display, a notebook computer, a digital photo frame, a mobile phone, a navigator, a tablet computer and the like.
Obviously, after the backlight module is adopted, the image displayed by the display panel of the display device has better light color uniformity, the integral thickness is reduced, the ultrathin design is favorably realized, the production cost is reduced, the production process is simplified, and correspondingly, the production efficiency is improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (14)
1. The backlight module is characterized by comprising a circuit board, a plurality of monochromatic light-emitting units arranged on the circuit board, a transparent packaging layer covering the monochromatic light-emitting units, and a light-intensifying layer and a light-shielding layer which are sequentially covered right above the packaging layer; the backlight module further comprises:
the composite functional structure at least has a light conversion function, is arranged between the packaging layer and the light enhancement layer and covers the packaging layer, realizes a light mixing function through reflection, and converts monochromatic light emitted by the monochromatic light emitting unit into polychromatic light to be emitted;
the distance between two adjacent single-color light-emitting units is greater than or equal to 1.5 mm; the total thickness of the backlight module can be less than 0.8 mm.
2. The backlight module as claimed in claim 1, wherein the composite functional structure comprises a composite light mixing film and a composite optical film, and the composite optical film and the composite light mixing film are in an up-and-down covering relationship between the encapsulating layer and the light-adding layer;
the composite light mixing film comprises:
a first optical film layer; and the number of the first and second groups,
the light mixing functional layer is arranged on the surface and/or inside the first optical film layer and is provided with a light homogenizing surface for enhancing light reflection and scattering; the reflectivity range of the light homogenizing surface is 50-100%, and the transmissivity range is 0-50%;
the composite optical film includes a light conversion functional structure having at least a light conversion function.
3. The backlight module as claimed in claim 2, wherein the composite optical film, the composite light mixing film and the encapsulation layer are sequentially disposed in an up-down covering manner; the light mixing function layer is arranged on the outer surface of the first optical film layer and is abutted against the packaging layer;
the light conversion function structure comprises a light conversion layer arranged on the first optical film layer and a light condensation layer arranged on the emergent surface of the light conversion layer.
4. The backlight module as claimed in claim 2, wherein the composite light mixing film, the composite optical film and the encapsulation layer are sequentially disposed in an up-down covering manner; the light conversion functional structure comprises a light conversion layer arranged on the packaging layer and a light condensation layer arranged on the emergent surface of the light conversion layer;
one side of the first optical film layer is arranged on the light enhancement layer, and the other side of the first optical film layer is abutted against the light condensation layer; the light mixing function layer is arranged on the inner surface of one side, close to the light conversion layer, of the first optical film layer.
5. The backlight module as claimed in claim 2, wherein the composite light mixing film, the composite optical film and the encapsulation layer are sequentially disposed in an up-down covering manner; the light conversion functional structure comprises a light condensation layer arranged on the packaging layer and a light conversion layer arranged on a light emitting surface of the light condensation layer;
one side of the first optical film layer is arranged on the light-adding layer; the light mixing function layer is arranged on the outer surface of the other side of the first optical film layer.
6. The backlight module as claimed in claim 1, wherein the composite functional structure comprises a composite light-mixing optical film disposed on the light-enhancing layer and on the encapsulation layer;
the composite light-mixing optical film comprises:
a second optical film layer;
the light mixing functional layer is arranged on the surface and/or inside the second optical film layer and is provided with a light homogenizing surface for enhancing the reflection and scattering of light rays; wherein the reflectivity range of the light homogenizing surface is 50-100%, and the transmissivity range is 0-50%;
the light conversion layer is arranged on the light emitting surface of the second optical film layer; and the number of the first and second groups,
and one side of the light-gathering layer is arranged on the light-emitting surface of the light conversion layer, and the other side of the light-gathering layer is arranged on the light-intensifying layer.
7. A backlight module according to claim 1, wherein the composite functional structure comprises:
the third optical film layer is arranged on the packaging layer;
one side of the composite light mixing optical film is arranged on the light enhancing layer, and the other side of the composite light mixing optical film is arranged on the packaging layer;
the composite light-mixing optical film comprises:
the light condensing layer is arranged on the light emitting surface of the third optical film layer;
the second optical film layer is arranged on the light emitting surface of the light condensing layer;
the light mixing functional layer is arranged on the surface and/or inside the second optical film layer and is provided with a light homogenizing surface for enhancing the reflection and scattering of light rays; wherein the reflectivity range of the light homogenizing surface is 50-100%, and the transmissivity range is 0-50%;
and one side of the light conversion layer is arranged on the light enhancement layer, and the other side of the light conversion layer is arranged on the light emitting surface of the second optical film layer.
8. The backlight module as claimed in claim 1, wherein the composite functional structure comprises a composite light-mixing optical film disposed on the light-enhancing layer and on the encapsulation layer;
the composite light-mixing optical film comprises:
a light conversion layer disposed on the encapsulation layer;
the second optical film layer is arranged on the light conversion layer;
the light mixing functional layer is arranged on the surface and/or inside the second optical film layer and is provided with a light homogenizing surface for enhancing the reflection and scattering of light rays; wherein the reflectivity range of the light homogenizing surface is 50-100%, and the transmissivity range is 0-50%;
and one side of the light-gathering layer is arranged on the second optical film layer, and the other side of the light-gathering layer is arranged on the light-adding layer.
9. The backlight module according to any of claims 2 to 8, wherein the light homogenizing surface is a reflecting surface formed by an opaque reflecting layer laid out by a plurality of light mixing elements;
the light mixing element is used for reflecting polychromatic light or monochromatic light and is formed by at least one structure or pattern of lattice points, concave-convex structures, filling or stripes.
10. The backlight module according to claim 9, wherein the light mixing function layer is located directly above the single-color light emitting unit, and the arrangement density of the light mixing elements is inversely related to the distance between the light mixing elements and the single-color light emitting unit.
11. A backlight module according to claim 1, wherein: the single-color light-emitting unit is one of a blue light chip, a purple light chip or an ultraviolet light chip.
12. A backlight module according to claim 1, wherein: the packaging layer is mainly formed by a resin material or a silica gel material; the transmittance of the packaging layer is greater than or equal to 90%.
13. A backlight module according to claim 1, wherein: the circuit board is a flexible circuit board.
14. A display device, characterized by: the display device comprises the backlight module according to any one of claims 1 to 13.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/111015 WO2020077615A1 (en) | 2018-10-19 | 2018-10-19 | Backlight module and display device |
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| CN111095088A true CN111095088A (en) | 2020-05-01 |
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| CN112086014A (en) * | 2020-09-16 | 2020-12-15 | 武汉华星光电技术有限公司 | Backlight module and display device |
| TWI759173B (en) * | 2021-04-16 | 2022-03-21 | 友達光電股份有限公司 | Display module and display apparatus including the same |
| CN114415421A (en) * | 2022-01-27 | 2022-04-29 | 武汉华星光电技术有限公司 | Display panel and display device |
| CN114779521A (en) * | 2021-12-13 | 2022-07-22 | 深圳市华鼎星科技有限公司 | Dot-matrix backlight module and display screen using same |
| CN115220261A (en) * | 2022-06-09 | 2022-10-21 | 武汉华星光电技术有限公司 | Backlight module and display module |
| TWI805291B (en) * | 2021-12-22 | 2023-06-11 | 瑞軒科技股份有限公司 | Backlight module of display |
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| TWI759173B (en) * | 2021-04-16 | 2022-03-21 | 友達光電股份有限公司 | Display module and display apparatus including the same |
| CN114779521A (en) * | 2021-12-13 | 2022-07-22 | 深圳市华鼎星科技有限公司 | Dot-matrix backlight module and display screen using same |
| TWI805291B (en) * | 2021-12-22 | 2023-06-11 | 瑞軒科技股份有限公司 | Backlight module of display |
| US11782307B2 (en) | 2021-12-22 | 2023-10-10 | Amtran Technology Co., Ltd. | Backlight module of display device |
| CN114415421A (en) * | 2022-01-27 | 2022-04-29 | 武汉华星光电技术有限公司 | Display panel and display device |
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