CN112684636A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN112684636A CN112684636A CN202110078482.2A CN202110078482A CN112684636A CN 112684636 A CN112684636 A CN 112684636A CN 202110078482 A CN202110078482 A CN 202110078482A CN 112684636 A CN112684636 A CN 112684636A
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Abstract
The invention discloses a backlight module and a display device, wherein the backlight module comprises a back plate, a light source, an optical regulation and control membrane and a wavelength conversion membrane, wherein the optical regulation and control membrane and the wavelength conversion membrane are arranged on the light emitting side of the light source; the transmittance of a first area of the optical regulation and control membrane is smaller than that of a second area of the optical regulation and control membrane, the first area corresponds to the light source, and the second area corresponds to the periphery of the light source and surrounds the first area; the wavelength conversion film is arranged on one side of the optical regulation film, which is far away from the light source, and is used for converting the first light passing through the optical regulation film into second light with different wavelengths and partially reflecting the first light to the optical regulation film; the wavelength conversion membrane is provided with a first micropore corresponding to the first region. The backlight module of the technical scheme of the invention can improve the color cast problem while ensuring the uniformity of the emergent light.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
In recent years, with the widespread use of electronic products, display panels (display panels) for providing display functions in electronic products have been the focus of attention of designers. The display panel does not have a light emitting function, but cooperates with a backlight module (backlight module) to achieve a display function. The backlight module generally includes an assembly frame, a light source, and various types of optical films, such as a light guide plate, a diffuser, a brightness enhancement film, etc., for adjusting the transmission direction or distribution of light emitted from the light source. The light adjusting film, such as a porous reflector, can improve the uniformity of light and improve the phenomenon of uneven light distribution (mura) generated by the backlight module. Meanwhile, in order to make the backlight module have Wide Color Gamut (WCG) performance, the backlight module also adopts a monochromatic light source and a wavelength conversion film in combination. The wavelength conversion film can convert part of light emitted by the light source into another light with different wavelengths, for example, part of blue light is converted into yellow light, and then the two lights with different wavelengths are mixed into white light.
However, since the backlight module has the porous reflection sheet, more light reflection occurs between the wavelength conversion film and the region with less micro-pores in the porous reflection sheet (i.e. the region above the corresponding light source), so that more light is converted into yellow light in the region above the light source, resulting in non-uniform color of the whole light emitted from the backlight module, i.e. color shift problem.
Disclosure of Invention
The invention mainly aims to provide a backlight module, aiming at solving the problem that the light emitted by the backlight module has color cast.
In order to achieve the above object, the present invention provides a backlight module comprising:
a back plate;
the light source is arranged on the back plate and emits first light rays;
the optical regulation and control membrane is arranged on the light-emitting side of the light source, the penetration rate of a first area of the optical regulation and control membrane is smaller than that of a second area of the optical regulation and control membrane, the first area corresponds to the light source, and the second area corresponds to the periphery of the light source and surrounds the first area; and
the wavelength conversion film is arranged on one side, away from the light source, of the optical regulation film, and is used for converting the first light passing through the optical regulation film into second light with different wavelengths and partially reflecting the first light of the optical regulation film to the optical regulation film; the wavelength conversion membrane is provided with a first micropore corresponding to the first region.
In an optional embodiment, the first micro holes are provided in plural, the wavelength conversion film is provided with a plurality of second micro holes at positions corresponding to the second regions, the opening area of the second micro holes is equal to the opening area of the first micro holes, and the number of the second micro holes is smaller than the number of the first micro holes.
In an optional embodiment, the first micro-holes and the second micro-holes are concentric circular holes, and a distribution density of the first micro-holes is greater than a distribution density of the second micro-holes in a direction from a center to an edge of the wavelength conversion film.
In an optional embodiment, a second micro hole is formed in a position of the wavelength conversion membrane corresponding to the second region, the number of the first micro hole is the same as that of the second micro hole, and the opening area of the second micro hole is smaller than that of the first micro hole.
In an optional embodiment, the optical modulation diaphragm is a porous reflection sheet, the porous reflection sheet is provided with third micropores in the first region, and is provided with fourth micropores in the second region, and the number and/or area of the third micropores is less than or equal to the number and/or area of the fourth micropores.
In an alternative embodiment, the opening area of the first micro-hole is smaller than the opening area of the third micro-hole.
In an optional embodiment, a projection of the first micro-hole on the back plate is offset from a projection of the third micro-hole on the back plate.
In an optional embodiment, the light source further comprises an optical film, and the optical film is arranged between the light source and the optical regulation film; or the optical membrane is arranged on one side of the wavelength conversion membrane, which is far away from the optical regulation and control membrane.
The invention provides a backlight module, which comprises: a back plate;
the light source is arranged on the back plate and emits first light rays;
the optical regulation and control membrane is arranged on the light-emitting side of the light source, the penetration rate of a first area of the optical regulation and control membrane is smaller than that of a second area of the optical regulation and control membrane, the first area corresponds to the light source, and the second area corresponds to the periphery of the light source and surrounds the first area; and
the wavelength conversion film is arranged on one side, away from the light source, of the optical regulation film, and is used for converting the first light passing through the optical regulation film into second light with different wavelengths and partially reflecting the first light of the optical regulation film to the optical regulation film; the position of the wavelength conversion membrane corresponding to the first area is provided with a first micropore;
the first micropores are provided with a plurality of second micropores corresponding to the second region of the wavelength conversion membrane;
the opening area of the second micropores is equal to the opening area of the first micropores, and the number of the second micropores is less than that of the first micropores; or the number of the first micropores is the same as that of the second micropores, and the opening area of the second micropores is smaller than that of the first micropores;
the optical regulation and control membrane is a porous optical regulation and control membrane, the optical regulation and control membrane is provided with third micropores in the first area, and is provided with fourth micropores in the second area, and the number and/or the area of the third micropores are less than or equal to those of the fourth micropores.
The invention further provides a display device, which comprises a display panel and the backlight module.
The backlight module comprises a back plate, a light source, an optical regulating membrane and a wavelength conversion membrane, wherein the light source is arranged on the back plate, the optical regulating membrane and the wavelength conversion membrane emit first light rays towards the direction of the optical regulating membrane and the direction of the wavelength conversion membrane, the penetration rate of a first area of the optical regulating membrane is smaller than that of a second area, and the light rays emitted to the first area by the light source are more than that of the second area due to the combination of the distance, so that the light output amount of the first area of the optical regulating membrane is equal to that of the second area, and the uniform light output effect is achieved. Meanwhile, the wavelength conversion membrane is used for converting the first light rays emitted by the light source into second light rays and mixing the second light rays with the first light rays to form a backlight source, so that the backlight module has the performance capability of wide color gamut, and the first micropores are formed in the position corresponding to the first area due to the fact that the wavelength conversion membrane has the function of reflecting the first light rays, so that part of the first light rays can be allowed to pass through, the second light rays which are excessively converted by multiple reflections between the first area of the optical regulation membrane and the wavelength conversion membrane are avoided, the first light rays and the second light rays are balanced, the light colors emitted by the backlight module are uniform, and the problem of color cast is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a cross-sectional view of a backlight module according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of another embodiment of a backlight module of the present invention;
fig. 3 is a schematic structural diagram of a wavelength conversion film in an embodiment of a backlight module according to the invention.
The reference numbers illustrate:
| 100 | |
51 | Third micro-hole |
| 10 | |
53 | Fourth micro-hole |
| 30 | |
70 | |
| 50 | Optical regulating |
71 | First micro-hole |
| 50a | |
73 | Second micro-hole |
| 50b | |
90 | Optical film |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The present invention provides a backlight module 100.
Referring to fig. 1, in the embodiment of the present invention, the backlight module 100 includes:
a back plate 10;
the light source 30 is arranged on the back plate 10, and emits a first light ray;
an optical control film 50 disposed on the light emitting side of the light source 30, wherein a transmittance of a first region 50a of the optical control film 50 is smaller than a transmittance of a second region 50b of the optical control film 50, the first region 50a corresponds to the light source 30, and the second region 50b corresponds to the periphery of the light source 30 and surrounds the first region 50 a; and
the wavelength conversion film 70 is disposed on a side of the optical modulation film 50 away from the light source 30, and is configured to convert the first light passing through the optical modulation film 50 into a second light having a different wavelength, and partially reflect the first light of the optical modulation film 50 to the optical modulation film 50; the wavelength conversion film 70 has a first micro-hole 71 at a position corresponding to the first region 50 a.
In this embodiment, the back plate 10 may be replaced by an assembly frame, etc. to provide a stable foundation for the backlight module 100, which is not limited herein. The light source 30 is disposed on the back plate 10, and specifically, the light source 30 may be a blue light emitting diode device, where the emitted first light is blue light, but is not limited thereto, and may also be a red light emitting diode, for example. The number of the light sources 30 is not limited to one shown in the figure, and a plurality of light sources 30 may be disposed and uniformly distributed on the back plate 10 in an array manner, and the first light emitted from the plurality of light sources 30 faces the first optical film 90 and the wavelength conversion film 70, so as to improve the uniformity of the light emitted from the backlight module 100.
In order to make the backlight module 100 have the performance of wide color gamut, the wavelength conversion film 70 of the backlight module 100 may adopt a Quantum Dot Enhancement Film (QDEF), that is, the inside of the transparent substrate has conversion quantum dots, so that the wavelength conversion film itself has a function of reflecting light, and at the same time, the first light emitted from the light source 30 can be converted into a second light with different wavelengths by the wavelength conversion film 70, and then the second light is mixed with the first light and emitted to the outside of the backlight module 100. Taking the light source 30 as a blue light emitting diode device as an example, the first light emitted therefrom is blue light, and when the blue light is emitted to the wavelength conversion film 70, a portion of the blue light is converted by the wavelength conversion film 70 into a second light with a different wavelength, for example, yellow light and unconverted blue light are mixed into white light and emitted out of the backlight module 100. Of course, in other embodiments, the wavelength conversion film 70 may be of other types, such as a phosphor-doped optical film 90.
Meanwhile, the backlight module 100 is further provided with an optical regulation and control film 50, and the first light emitted by the light source 30 passes through the optical regulation and control film 50 before being emitted to the wavelength conversion film 70, and the optical regulation and control film 50 can reflect or refract the first light, for example, a reflector or a prism, so as to improve the uniformity of the first light. And the transmittance of the different regions of the optical control film 50 is different, because the distance between the light source 30 and the different regions of the optical control film 50 is different, the region of the first light emitted perpendicular to the light source 30 is the first region 50a of the optical control film 50, the first region 50a is located right above the light source 30, the received first light is the most, and the portion far away from the light source 30 is the second region 50b, because the light is broken during the transmission process, the received first light by the second region 50b is less, the transmittance of the first region 50a is set to be smaller than that of the second region 50b, so as to neutralize the light transmission amount of the two regions, so that the light output amount of the first region 50a of the optical control film 50 is equivalent to that of the second region 50b, thus, the light entering each portion of the wavelength conversion film 70 is more uniform, the uniformity of the light output quantity is improved. Here, the difference in transmittance may be designed by making holes or providing a dot structure.
Certainly, after the first light passes through the first region 50a of the optical modulation diaphragm 50 and reaches the wavelength conversion diaphragm 70, because the wavelength conversion diaphragm 70 also has a certain reflection capability, the first light can be reflected onto the optical modulation diaphragm 50 again, at this time, the first light is easily reflected between the two light repeatedly, so that the first light is easily collided and converted with the quantum dots in the wavelength conversion diaphragm 70, and more second light is formed, where the wavelength conversion diaphragm 70 is provided with the first micropores 71 at a position corresponding to the first region 50a, the number of the first micropores 71 may be one, or may be two or more, and the shape of the first micropores 71 may be a circle, a square, an irregular shape, or the like, which is not limited herein. The first micro-hole 71 is disposed such that the first light reflected therebetween is directly emitted without conversion.
The backlight module 100 of the present invention comprises a back plate 10, a light source 30 disposed on the back plate 10, an optical modulation film 50 and a wavelength conversion film 70, wherein the light source 30 emits a first light toward the optical modulation film 50 and the wavelength conversion film 70, the transmittance of the first region 50a of the optical modulation film 50 is smaller than that of the second region 50b, and the distance is combined to cause more light emitted from the light source 30 to the first region 50a than that of the second region 50b, so as to achieve a uniform light output effect. Meanwhile, the wavelength conversion film 70 is used to convert the first light emitted by the light source 30 into the second light, and the second light is mixed with the first light to form the backlight source 30, so that the backlight module 100 has the performance capability of wide color gamut, and because the wavelength conversion film 70 has the function of reflecting the first light, the first micropores 71 are formed at the position corresponding to the first area 50a, so that part of the first light can be allowed to pass through, the second light which is excessively converted by multiple reflections between the first area 50a of the optical control film 50 and the wavelength conversion film 70 is avoided, and the first light and the second light are balanced, so that the light emitted by the backlight module 100 is uniform, and the color cast problem is solved.
Referring to fig. 2, in an alternative embodiment, a plurality of first micro holes 71 are formed, a plurality of second micro holes 73 are formed in the position of the wavelength conversion film 70 corresponding to the second region 50b, the opening area of the second micro holes 73 is equal to the opening area of the first micro holes 71, and the number of the second micro holes 73 is smaller than the number of the first micro holes 71.
In this embodiment, in order to further reduce the color shift by adjusting the size of the first micro-hole 71, the second micro-hole 73 is disposed at the position of the wavelength conversion film 70 corresponding to the second region 50b, the shape of the second micro-hole 73 may be the same as the shape of the first micro-hole 71, for example, all of the second micro-holes are circular holes, and the opening area of the second micro-hole 73 is the same as the opening area of the first micro-hole 71, in other words, the diameter of the first micro-hole 71 is the same as the diameter of the second micro-hole 73, at this time, in order to correspond to different penetration rates of different regions of the optical modulation film 50, the number of the second micro-holes 73 is smaller than the number of the first micro-holes 71, so that the position of the wavelength conversion film 70 corresponding to the first region 50a allows more first light to directly pass through, and the position corresponding to the second region 50b allows relatively smaller first light to directly pass through, and more second light generated by itself corresponding to the position of the first, and the position corresponding to the second region 50b has equal or more first light rays passing through, so that the first light rays and the second light rays passing through the wavelength conversion film 70 are equal, thereby improving the light emitting effect and avoiding color cast. The number of the first micro holes 71 and the second micro holes 73 can be designed according to the different penetration rates of the optical regulation film 50, so as to obtain the required light emitting effect.
Referring to fig. 2 and fig. 3, in an alternative embodiment, the first micro holes 71 and the second micro holes 73 are concentric circular holes, and a distribution density of the first micro holes 71 is greater than a distribution density of the second micro holes 73 in a direction from a center to an edge of the wavelength conversion film 70.
In this embodiment, although the opening areas of the first micropores 71 and the second micropores 73 are the same, the diameters of the first micropores 71 and the second micropores 73 are not the same, and the first micropores 71 and the second micropores 73 are arranged to be concentric circular holes, for example, the first micropores 71 is a central circular hole of the wavelength conversion film 70, and the second micropores 73 is a circular ring hole surrounding the central circular hole, and of course, the second micropores 73 is also a circular ring hole of the wavelength conversion film 70 corresponding to the second region 50b, so that, in order to achieve different numbers, the distribution density of the first micropores 71 is greater than that of the second micropores 73, where a plurality of the first micropores 71 are concentrated in the position of the wavelength conversion film 70 corresponding to the first region 50a, and the second micropores 73 are located in the position of the wavelength conversion film 70 corresponding to the second region 50b, and have a larger distance therebetween, or from the center to the edge of the wavelength conversion film 70, the distance between the first micro-holes 71 and the second micro-holes 73 is in an incremental manner, that is, the arrangement of the peripheral second micro-holes 73 is sparse, the arrangement of the internal first micro-holes 71 is tight, and the specific numerical value is set according to the actual requirement, so as to achieve the purpose of reducing color cast.
In an alternative embodiment, the wavelength conversion film 70 is provided with second micro holes 73 at positions corresponding to the second regions 50b, the number of the first micro holes 71 is the same as that of the second micro holes 73, and the opening area of the second micro holes 73 is smaller than that of the first micro holes 71.
In this embodiment, different from the structure of the above embodiment, the number of the second micro holes 73 is the same as that of the first micro holes 71, for example, one of the second micro holes 73 and one of the first micro holes 71 are both provided, so that the emission amount of the first light is realized by the difference between the opening area of the second micro holes 73 and the opening area of the first micro holes 71, taking the first micro holes 71 and the second micro holes 73 as circular holes as an example, the first micro holes 71 are circular holes at the center of the wavelength conversion film 70, and the second micro holes 73 need circular ring holes with the center of the first micro holes 71 as a center, so that the light emission chromaticity of each part in the second region 50b surrounding the first region 50a can be ensured to be uniform.
Of course, in other embodiments, when the number of the first micro holes 71 and the second micro holes 73 and the area of each hole are different, it is only necessary to ensure that the total area of the plurality of first micro holes 71 is larger than the total area of the second micro holes 73.
In an alternative embodiment, the optical modulation diaphragm 50 is a porous reflection sheet, the porous reflection sheet has a first region 50a with third micropores 51, and a second region 50b with fourth micropores 53, and the number and/or area of the third micropores 51 is less than or equal to the number and/or area of the fourth micropores 53.
In this embodiment, the optical modulation diaphragm 50 is a porous reflective sheet, the first region 50a is provided with third micropores 51, and the second region 50b is provided with fourth micropores 53, so that the transmittance of the first region 50a is smaller than that of the second region 50b by the number and area of the third micropores 51 and the fourth micropores 53. The optical regulation and control membrane 50 of this structure conveniently processes, effectively reduces the processing cost, also is convenient for control design size simultaneously, reduces the appearance of colour cast. For example, the third micropores 51 and the fourth micropores 53 are both round holes, and the number of the third micropores 51 is the same as that of the fourth micropores 53, so that the opening area of the third micropores 51 is smaller than that of the fourth micropores 53; if the opening sizes of the fourth micro holes 53 and the third micro holes 51 are the same, the number of the fourth micro holes 53 is larger, the distribution density of the second region 50b is larger, and the number of the third micro holes 51 is smaller, so that the light output amount of the second region 50b is larger and the light output amount of the first region 50a is smaller.
Of course, in other embodiments, the shapes of the third micro-hole 51 and the fourth micro-hole 53 may also be square or irregular, and the sizes and the numbers of the openings are different, so as to ensure that the opening area of the second region 50b is larger than that of the first region 50 a.
In an alternative embodiment, the opening area of the first micro-hole 71 is smaller than the opening area of the third micro-hole 51.
In this embodiment, in order to reduce the influence of the opening of the first micro-hole 71 on the light output amount, the opening area of the first micro-hole 71 is smaller than the opening area of the third micro-hole 51, for example, the first micro-hole 71 is circular, and the third micro-hole 51 is also circular, that is, the diameter of the first micro-hole 71 is smaller than the diameter of the third micro-hole 51, so that the light output amount regulated by the optical regulation diaphragm 50 is not changed by the first micro-hole 71 for regulating the light output chromaticity, and the problem of color shift is solved without affecting the overall light output intensity.
In an alternative embodiment, the projection of the first micro-hole 71 on the back plate 10 is offset from the projection of the third micro-hole 51 on the back plate 10.
In this embodiment, because the optical control film 50 and the wavelength conversion film 70 are both parallel to the surface of the back plate 10, the projection of the first micro-hole 71 on the back plate 10 and the projection of the third micro-hole 51 on the back plate 10 are arranged in a staggered manner, that is, the first micro-hole 71 and the third micro-hole 51 are not overlapped in a direction perpendicular to the back plate 10, so that the first light passing through the optical control film 50 can be directly emitted after being reflected to a certain extent, the probability of emitting the first light from the wavelength conversion film 70 is increased, the probability of converting the first light into the second light is also increased, the first light and the second light are ensured to be emitted in a balanced manner, and the purpose of uniform chromaticity is achieved.
In an optional embodiment, an optical film 90 is further included, and the optical film 90 is disposed between the light source 30 and the optical modulation film 50; alternatively, the optical film 90 is disposed on a side of the wavelength conversion film 70 away from the optical modulation film 50.
Here, the backlight assembly 100 may further include an optical film 90, such as a diffusion sheet or a prism. The optical film 90 may be disposed between the light source 30 and the optical control film 50, so that the first light entering the optical control film 50 can be uniformly diffused, and the light-emitting angle of the backlight module 100 can be increased. Of course, the optical film 90 may also be disposed on a side of the wavelength conversion film 70 away from the optical regulation film 50, so as to adjust the distribution of the light output amount passing through the wavelength conversion film 70 with the first micro-holes 71, and further ensure the uniformity of the light output intensity while solving the color shift. Specifically, the overall transmittance of the first light in the optical control film 50 may be set to be smaller than the overall transmittance of the second light in the optical control film 90, for example, the ratio of the transmittance of the second light in the optical control film 90 to the overall transmittance of the first light in the optical control film 50 is greater than or equal to 45%, and the overall transmittance of the first light in the optical control film 50 is smaller than 10%, so that the light output chromaticity can be better balanced, and a better light output effect can be obtained.
Referring to fig. 2, the present invention further provides a backlight module 100, where the backlight module 100 includes: a back plate 10;
the light source 30 is arranged on the back plate 10, and emits a first light ray;
an optical control film 50 disposed on the light emitting side of the light source 30, wherein a transmittance of a first region 50a of the optical control film 50 is smaller than a transmittance of a second region 50b of the optical control film 50, the first region 50a corresponds to the light source 30, and the second region 50b corresponds to the periphery of the light source 30 and surrounds the first region 50 a; and
the wavelength conversion film 70 is disposed on a side of the optical modulation film 50 away from the light source 30, and is configured to convert the first light passing through the optical modulation film 50 into a second light having a different wavelength, and partially reflect the first light of the optical modulation film 50 to the optical modulation film 50; the wavelength conversion film 70 is provided with a first micropore 71 corresponding to the first region 50 a;
a plurality of first micropores 71 are provided, and a plurality of second micropores 73 are provided at the position of the wavelength conversion film 70 corresponding to the second region 50 b;
the opening area of the second micropores 73 is equal to the opening area of the first micropores 71, and the number of the second micropores 73 is smaller than the number of the first micropores 71; or, the number of the first micropores 71 and the second micropores 73 is the same, and the opening area of the second micropores 73 is smaller than that of the first micropores 71;
the optical modulation diaphragm 50 is a porous reflection sheet, the porous reflection sheet is provided with third micropores 51 in the first region 50a, and is provided with fourth micropores 53 in the second region 50b, and the number and/or area of the third micropores 51 is less than or equal to the number and/or area of the fourth micropores 53.
In this embodiment, the same as the backlight module 100 of the above embodiment, the first micro-holes 71 are formed at the position of the wavelength conversion film 70 corresponding to the first region 50a, so as to increase the probability that the first light passing through the optical modulation film 50 can be directly emitted without conversion. The difference is that in order to conveniently adjust the size of the micro-holes on the wavelength conversion film 70 to match with the optical modulation film 50, the first micro-holes 71 are formed at the position of the wavelength conversion film 70 corresponding to the second region 50b, the second micro-holes 73 are also formed at the position of the wavelength conversion film 70 corresponding to the second region 50b, the number and/or the area of the first micro-holes 71 are limited to be larger than those of the second micro-holes 73, and the optical modulation film 50 is set to be the porous optical modulation film 50, so that the color cast problem of the backlight module 100 is improved, the uniformity of the overall light intensity of the backlight module 100 is not affected, and the light emitting effect is ensured.
The present invention further provides a display device (not shown), the display device includes a backlight module 100, the specific structure of the backlight module 100 refers to the structure of the backlight module 100 of any of the above embodiments, and since the structure of the backlight module 100 of the display device includes the structure of any of the above backlight modules 100, the effective effect brought thereby is not described herein again.
The backlight module 100 may further include a light guide plate, a brightness enhancement film or a diffusion sheet, the light guide plate may convert the point light source 30 into a uniform area light source 30 for emitting, the brightness enhancement film may increase the brightness of the emitting light, and the diffusion sheet may increase the emitting angle of the emitting light, thereby providing a uniform and stable light source 30 for the display panel.
Meanwhile, the display panel further comprises a display panel, the display panel is arranged right above the backlight module 100, so that emergent light of the backlight module 100 can be received well, structurally, the display panel comprises an array backboard 10, a color film backboard 10 and a liquid crystal layer clamped between the array backboard 10 and the color film backboard 10, a common electrode of the color backboard 10 and a pixel electrode of the array backboard 10 form a parallel capacitor when a circuit is switched on, liquid crystal molecules are driven together, and accordingly light rays display required images. Of course, the display device further includes a frame and other supporting members for fixing the backlight module 100 and the display panel, so as to provide a stable supporting base for the display device.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A backlight module is characterized in that the backlight module comprises:
a back plate;
the light source is arranged on the back plate and emits first light rays;
the optical regulation and control membrane is arranged on the light-emitting side of the light source, the penetration rate of a first area of the optical regulation and control membrane is smaller than that of a second area of the optical regulation and control membrane, the first area corresponds to the light source, and the second area corresponds to the periphery of the light source and surrounds the first area; and
the wavelength conversion film is arranged on one side, away from the light source, of the optical regulation film, and is used for converting the first light passing through the optical regulation film into second light with different wavelengths and partially reflecting the first light of the optical regulation film to the optical regulation film; the wavelength conversion membrane is provided with a first micropore corresponding to the first region.
2. The backlight module as claimed in claim 1, wherein the first micro holes are provided in plural numbers, the wavelength conversion film is provided with second micro holes at positions corresponding to the second regions, the opening area of the second micro holes is equal to the opening area of the first micro holes, and the number of the second micro holes is smaller than the number of the first micro holes.
3. The backlight module as claimed in claim 2, wherein the first micro holes and the second micro holes are concentric circular holes, and the distribution density of the first micro holes is greater than that of the second micro holes from the center to the edge of the wavelength conversion film.
4. The backlight module as claimed in claim 1, wherein the wavelength conversion film has second micro holes corresponding to the second region, the first micro holes and the second micro holes have the same number, and the opening area of the second micro holes is smaller than that of the first micro holes.
5. The backlight module according to any of claims 1-4, wherein the optical modulation film is a porous reflector, the porous reflector has a third pore opened in the first region, and a fourth pore opened in the second region, and the number and/or area of the third pores is less than or equal to the number and/or area of the fourth pores.
6. The backlight module as claimed in claim 5, wherein the first micro via has an opening area smaller than that of the third micro via.
7. The backlight module as claimed in claim 5, wherein the projection of the first micro-hole on the back plate is offset from the projection of the third micro-hole on the back plate.
8. The backlight module as claimed in claim 1, further comprising an optical film disposed between the light source and the optical modulation film; or the optical membrane is arranged on one side of the wavelength conversion membrane, which is far away from the optical regulation and control membrane.
9. A backlight module is characterized in that the backlight module comprises:
a back plate;
the light source is arranged on the back plate and emits first light rays;
the optical regulation and control membrane is arranged on the light-emitting side of the light source, the penetration rate of a first area of the optical regulation and control membrane is smaller than that of a second area of the optical regulation and control membrane, the first area corresponds to the light source, and the second area corresponds to the periphery of the light source and surrounds the first area; and
the wavelength conversion film is arranged on one side, away from the light source, of the optical regulation film, and is used for converting the first light passing through the optical regulation film into second light with different wavelengths and partially reflecting the first light of the optical regulation film to the optical regulation film; the position of the wavelength conversion membrane corresponding to the first area is provided with a first micropore;
the first micropores are provided with a plurality of second micropores corresponding to the second region of the wavelength conversion membrane;
the opening area of the second micropores is equal to the opening area of the first micropores, and the number of the second micropores is less than that of the first micropores; or the number of the first micropores is the same as that of the second micropores, and the opening area of the second micropores is smaller than that of the first micropores;
the optical regulation and control membrane is a porous optical regulation and control membrane, the optical regulation and control membrane is provided with third micropores in the first area, and is provided with fourth micropores in the second area, and the number and/or the area of the third micropores are less than or equal to those of the fourth micropores.
10. A display device, comprising a display panel and the backlight module according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110078482.2A CN112684636A (en) | 2021-01-20 | 2021-01-20 | Backlight module and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110078482.2A CN112684636A (en) | 2021-01-20 | 2021-01-20 | Backlight module and display device |
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| CN112684636A true CN112684636A (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110078482.2A Pending CN112684636A (en) | 2021-01-20 | 2021-01-20 | Backlight module and display device |
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Application publication date: 20210420 |