CN114355667A - Mini LED backlight module and subjective edge optimization method thereof - Google Patents

Abstract

The invention provides a mini LED backlight module and a subjective edge optimization method thereof. Wherein mini LED backlight unit is including the screen, optical film material and the mini LED lamp plate that set gradually. The mini LED lamp panel comprises a substrate and a plurality of mini LED lamp sources arranged on the substrate, the substrate comprises a central area and an edge area, a reflecting film is arranged on the edge area, or the central area is provided with the reflecting film, and the edge area of the reflecting film is provided with a through hole; the reflecting film and the mini LED lamp source are arranged on the same side of the substrate and are arranged opposite to the optical film material. The mini LED backlight module and the subjective edge optimization method thereof provided by the invention can meet the design requirements under different conditions, realize the subjective edge optimization of different mini LED backlight modules, improve the uniformity of light emission and improve the consistency of subjective image quality.

Description

Mini LED backlight module and subjective edge optimization method thereof

Technical Field

The invention relates to the technical field of display equipment, in particular to a mini LED backlight module and a subjective edge optimization method thereof.

Background

In recent years, the mini LED is applied as a backlight source to an LCD (Liquid crystal display) panel, which can significantly improve display image quality such as contrast and brightness, and thus has attracted more and more market attention. The mini LED backlight technology is to bind an LED (Light Emitting Diode) chip to a back plate having a driving circuit, and to control the LED to emit Light in a divisional manner by the driving circuit to realize dynamic backlight. The more the number of partitions of the mini LED backlight is, the more the number of the lamps of the LED is, the more exquisite the backlight control is, and the LCD can realize the display quality with thinner appearance, higher brightness and high contrast by carrying the backlight technology.

However, because the mini LED backlight module is thinner than the conventional direct-type backlight module, the OD (optical density) of the mini LED backlight module is smaller. When the OD value is small, the light emitted from the mini LED cannot be mixed sufficiently, especially at the peripheral edge, which results in poor subjective edge viewing effect of the backlight module. The great backlight unit of OD value can improve the angle of marginal light-emitting through the angle of adjustment reflector plate scrap (bridge) among the prior art to make the marginal transition even, but because mini LED module OD is less, and in order to guarantee the commonality of lamp plate, can't use reflector plate scrap (bridge) angle of adjustment, there is no solution among the prior art, and backlight unit's main effect of seeing is poor then has influenced the development that mini LED is shaded.

Therefore, it is necessary to provide a mini LED backlight module and a subjective edge optimization method thereof for solving the above problems.

Disclosure of Invention

The technical problem to be solved by the present invention is that, in the prior art, when the OD value of the mini LED backlight module is small, sufficient light mixing cannot be performed, so that the visual effect of the peripheral edge position of the mini LED backlight module is poor, and in order to ensure the universality of the lamp panel, the angle cannot be adjusted by using the lapping of the reflector plate, so that the subjective edge visual effect of the mini LED backlight module is poor.

The technical scheme adopted by the invention for solving the technical problem is as follows:

in a first aspect, the invention provides a mini LED backlight module, which comprises a screen, an optical film material and a mini LED lamp panel which are arranged in sequence, wherein the mini LED lamp panel is provided with a plurality of blocks, the mini LED lamp panel comprises a substrate and a plurality of mini LED lamp sources arranged on the substrate, the substrate comprises a central area and an edge area, the edge area is provided with a reflecting film, or the central area is provided with a reflecting film and the reflecting film of the edge area is provided with a through hole; the reflecting film and the mini LED lamp source are arranged on the same side of the substrate and are arranged opposite to the optical film material.

In one implementation, the optical film material includes one or more of a diffuser film, a brightness enhancement film, and a quantum film.

In one implementation mode, the mini LED backlight module further comprises a diffusion plate, and the diffusion plate is arranged above the mini LED light source.

In one implementation mode, the plurality of mini LED light sources are arranged on the substrate in an array arrangement mode.

In one implementation, the distance between the arrays of adjacent mini LED light sources is equal.

In one implementation mode, the thickness of the reflecting film is 50-300 microns, the reflectivity is not less than 97%, and the heat shrinkage rate MD is not less than 0.5/TD is not more than 0.2.

In one implementation mode, the mini LED lamp panel further comprises white reflective ink covering one side of the substrate close to the optical film.

In one implementation mode, the substrate is made of electrolytic lead-free galvanized steel plates or aluminum substrates.

In one implementation mode, the mini LED lamp panels are spliced through filling resin materials.

In a second aspect, the present invention further provides a subjective edge optimization method for a mini LED backlight module, which includes the following steps:

judging the brightness of the edge area of the mini LED backlight module;

when the brightness of the edge area of the mini LED backlight module is lower than that of the central area, a reflecting film is attached to the edge area of the substrate of the mini LED backlight module;

when the brightness of the edge area of the mini LED backlight module is higher than that of the central area, a reflecting film is attached to the substrate of the mini LED backlight module, and the edge area of the reflecting film is provided with a through hole.

Has the advantages that: according to the technical scheme provided by the invention, the reflecting film is arranged on the periphery of the substrate, the light rays emitted by the mini LED light source are partially returned to the reflecting film, and the reflecting film reflects the irradiated light rays to the optical film material by utilizing the high reflectivity of the reflecting film, so that the light rays are recycled, the brightness output is improved, the subjective excessive uniformity of the edge of the display screen is realized, and the consistency of the subjective image quality is improved. Or a reflecting film is attached to the substrate, and through holes are formed in the periphery of the reflecting film, so that the brightness of the periphery of the mini LED backlight module is consistent with the brightness of the center of the mini LED backlight module, and the subjective transition uniformity of the edge of the display screen is realized. Meanwhile, the subjective edge optimization method of the mini LED backlight module can carry out different selections according to the conditions of the peripheral edge of the mini LED backlight module, can make different settings according to different conditions, meets the design under different conditions, realizes the subjective edge optimization of different mini LED backlight modules, improves the uniformity of light emission, and improves the consistency of subjective image quality.

Further embodiments of the invention are also capable of achieving other advantageous technical effects not listed, which other technical effects may be partially described below and which would be expected and understood by one skilled in the art after reading the present invention. This summary is intended to introduce a selection of concepts and options in a simplified form that are further described below in the detailed description of the invention to assist the reader in understanding the invention. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. All of the above features are to be understood as exemplary only and further features and objects, both as to structure and method, may be gleaned from the present disclosure. A more complete appreciation of the features, details, utilities, and advantages of the present invention will be provided in the following written description of various embodiments of the invention, illustrated in the accompanying drawings, and defined in the appended claims. Accordingly, no further restrictive interpretation of the summary of the invention should be understood without further reading of the entire specification, claims and drawings.

Drawings

FIG. 1 is a schematic view of the overall structure of a mini LED backlight module provided by the present invention;

FIG. 2 is a schematic structural diagram of a mini LED backlight module according to a first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a mini LED backlight module according to a second embodiment of the present invention;

FIG. 4 is a flowchart illustrating the specific steps of the subjective edge optimization method for a mini LED backlight module according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted if it may obscure the subject matter of the present invention. Those skilled in the art will appreciate that any features shown in the figures may be exaggerated, reduced, or simplified for ease of description and that the elements of the figures and drawings are not always shown to scale.

First embodiment

The invention provides a mini LED backlight module, which comprises a screen, an optical film material and a mini LED lamp panel which are sequentially arranged, wherein the mini LED lamp panel is provided with a plurality of blocks, the mini LED lamp panel comprises a substrate and a plurality of mini LED lamp sources arranged on the substrate, the substrate comprises a central area and an edge area, the edge area is provided with a reflecting film, or the central area is provided with a reflecting film and the reflecting film of the edge area is provided with a through hole; the reflecting film and the mini LED lamp source are arranged on the same side of the substrate and are arranged opposite to the optical film material.

Specifically, in the present embodiment, please refer to fig. 1 and fig. 2 in combination, in which fig. 1 is a schematic diagram of an overall structure of the mini LED backlight module provided by the present invention, and fig. 2 is a schematic diagram of a structure of a first embodiment of the mini LED backlight module provided by the present invention.

The embodiment provides a mini LED backlight module 100, which comprises a screen 11, an optical film 12 and a mini LED lamp panel 13 which are arranged in sequence. The mini LED lamp plate 13 is that the polylith concatenation formed, mini LED lamp plate 13 includes base plate 131 and installs a plurality of mini LED lamp sources 132 on the base plate 131, base plate 131 includes central zone and marginal area, mini LED lamp plate 13 is still including setting up reflectance coating 133 on the marginal area. The reflective film 133 and the mini LED light source 132 are disposed on the same side of the substrate 131, and are disposed opposite to the optical film 12 at an interval. Furthermore, the mini LED lamp panels 13 are spliced through filling resin materials.

Specifically, in this embodiment, the screen 11 is a glass screen, so as to realize the color and display effects of the mini LED backlight module. The substrate 131 is made of electrolytic lead-free galvanized steel sheet or aluminum substrate.

Further, the optical film material 12 includes one or more of a diffusion film, a brightness enhancement film and a quantum film, which plays a role in light divergence and convergence, and improves the uniformity of the whole picture of the mini LED backlight module 100. The diffusion film plays a role in correcting diffusion angles in the backlight module, so that the light radiation area is increased, but the light intensity of a unit area is reduced, namely, the luminance is reduced. After being diffused by the diffusion film, the luminous light source can be changed into a 2-time light source with larger area, better uniformity and stable chromaticity. The structure of the diffusion film is that optical light scattering particles are coated on two sides of a transparent substrate such as PET. The incremental film is a thin film or sheet applied in the mini LED backlight module 100 to improve the light emitting efficiency of the whole backlight system. The quantum film is used for reflecting more light rays and plays a role in light divergence and convergence.

In some embodiments, the mini LED backlight module 100 further comprises a diffuser plate (not shown) disposed above the mini LED light source. The diffuser plate is used for absorbing the light that mini LED lamp source sent, when light shines each leaded light point, the reverberation can be toward each angle diffusion, then destroys the reflection condition and openly jets out by the diffuser plate, through various leading light points of density, variation in size, can make the diffuser plate evenly give out light. In the present embodiment, the reflective film reflects the light exposed from the bottom surface back to the diffusion plate for improving the utilization efficiency of the light.

Further, the mini LED backlight module 100 can be by different quantity the concatenation of mini LED lamp plate 13 forms, mini LED lamp plate 13 is used for providing the output of luminance in a poor light, the specification and the position etc. of mini LED light source are right the effect is looked to mini LED backlight module 100's whole subjectivity plays decisive effect. The mini LED light sources 132 are welded on the surface of the substrate 131, and the mini LED light sources 132 are arranged on the substrate 131 in an array arrangement. Preferably, the distance between the arrays of adjacent mini LED light sources 132 is equal. And the mini LED backlight module emits light more uniformly in an array distribution mode among the mini LED lamp sources.

The mini LED lamp panel 13 further includes a white reflective ink 134, i.e., white oil, covering the substrate 131 near one side of the optical film 12. The white oil 134 can function to reflect light. Furthermore, the thickness of the reflecting film 133 provided by the invention is 50-300 microns, the reflectivity is not less than 97%, and the heat shrinkage rate MD is not more than 0.5/TD is not more than 0.2. In this embodiment, the mini LED backlight module 100 provided in this embodiment is compared with the mini LED backlight module 100 lacking the reflective film 133, and the brightness results are shown in table 1.

TABLE 1

From table 1, it can be known that the brightness difference of the whole lamp panel with or without the reflective film attached thereto is about 42%, i.e., the brightness of the reflective film attached thereto is about 42% higher than that of the reflective film not attached thereto. Referring to fig. 3 in combination, fig. 3 is a test result graph of the mini LED backlight module shown in fig. 2, the mini LED backlight module 100 provided by the present invention returns part of light emitted by the mini LED light source 132 to the reflective film 133, and the reflective film 133 repeatedly utilizes its own high reflectivity to reflect the irradiated light to the optical film material 12, so as to improve the output of brightness and effectively enhance the brightness of the edge area of the mini LED lamp panel.

The mini LED backlight module 100 works according to the following principle: when the mini LED light source 132 emits light, the light passes through the optical film 12, and is reflected, refracted, and scattered on the optical film 12, so that uniform light is obtained and passes through the screen 11, the light is changed by the twisted liquid crystal molecules in the liquid crystal electric field in the screen 11, and is irradiated on the color filter in the screen 11 in different proportions, and thus different colors are generated to realize the display of the picture. At this time, the reflective film 133 of the mini LED lamp panel 13 reflects the irradiated light repeatedly back to the optical film material 12, so that the output of the brightness of the edge area is improved, and the subjective image quality consistency of the mini LED backlight module 100 is improved.

Second embodiment

Referring to fig. 1 and fig. 3 in combination, fig. 1 is a schematic diagram of an overall structure of a mini LED backlight module provided by the present invention, and fig. 3 is a schematic diagram of a structure of a second embodiment of the mini LED backlight module provided by the present invention. The present embodiment provides a mini LED backlight module 200, which includes a screen 11, an optical film 12 and a mini LED lamp panel 13, which are sequentially disposed. Mini LED lamp plate 13 is that the polylith concatenation forms, mini LED lamp plate 13 includes base plate 231, installs mini LED lamp source 232 on the base plate 231 and subsides are established reflection coating 233 on the base plate 231, reflection coating 233 edge all around has through-hole 2331, reflection coating 233 with mini LED lamp source 232 sets up same one side of base plate 231, and with the relative interval setting of optical film material 232. Specifically, the specific structures of the screen 11 and the optical film 12 are the same as those in the first embodiment, and are not repeated in this embodiment. Further, the through hole 2331 is a circular hole.

In this embodiment, when the brightness of the edge region of the mini LED backlight module 200 is greater than the brightness of the central region, the reflective film 233 is attached to the substrate 231, and the through hole 2331 is drilled at a bright position of the edge region of the reflective film 233, so that the brightness output of the position of the mini LED lamp panel 23 corresponding to the through hole 2331 is reduced, and the overall subjective uniformity is improved. Specifically, the through hole is a circular hole in this embodiment.

Unlike the first embodiment, in this embodiment, the reflective film 233 of the mini LED lamp panel 23 reflects the irradiated light back to the optical film material 22 by recycling, so that the brightness output at the position of the through hole 2331 of the edge region of the corresponding reflective film is reduced, the brightness output of the edge region is reduced, and the subjective image quality consistency of the mini LED backlight module 200 is improved.

Third embodiment

Referring to fig. 4, the present invention further provides a subjective edge optimization method of a mini LED backlight module, which includes the following steps:

s01, judging the brightness of the edge area of the mini LED backlight module;

s02, when the brightness of the edge area of the mini LED backlight module is lower than that of the central area, a reflecting film is attached to the edge area of the substrate of the mini LED backlight module;

and S03, when the brightness of the edge area of the mini LED backlight module is higher than that of the central area, a reflecting film is attached to the substrate of the mini LED backlight module, and the edge area of the reflecting film is provided with a through hole.

In summary, in the mini LED backlight module 100 provided by the present invention, the reflective film 133 is disposed on the edge region of the mini LED lamp panel 13, so that the reflective film 133 of the mini LED lamp panel 13 repeatedly reflects the irradiated light to the optical film material 12, thereby improving the output of the brightness of the edge region and improving the subjective image quality consistency of the mini LED backlight module 100; or the reflecting film 233 is attached to the substrate 231, and meanwhile, through holes are formed in the periphery of the reflecting film 233, so that the position brightness output of the mini LED lamp panel corresponding to the through holes is reduced, and the subjective image quality consistency of the mini LED backlight module 200 is improved. Meanwhile, the subjective edge optimization method of the mini LED backlight module can carry out different selections according to the conditions of the peripheral edge of the mini LED backlight module, can make different settings according to different conditions, meets the design under different conditions, realizes the subjective edge optimization of different mini LED backlight modules, improves the uniformity of light emission, and improves the consistency of subjective image quality.

Finally, it should be noted that: the foregoing description is illustrative of exemplary embodiments and is not to be construed as limiting thereof. Although a few exemplary embodiments have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of the exemplary embodiments. Accordingly, all such modifications are intended to be included within the scope of the exemplary embodiments as defined in the claims. In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Therefore, it is to be understood that the foregoing is illustrative of exemplary embodiments and is not to be construed as limited to the specific exemplary embodiments disclosed, and that modifications to the disclosed exemplary embodiments, as well as other exemplary embodiments, are intended to be included within the scope of the appended claims. The invention is defined by the following claims, with equivalents of the claims to be included therein.

Claims (10)

1. A mini LED backlight module is characterized by comprising a screen, an optical film material and a mini LED lamp panel which are sequentially arranged, wherein the mini LED lamp panel is multiple, the mini LED lamp panel comprises a substrate and a plurality of mini LED lamp sources arranged on the substrate, the substrate comprises a central area and an edge area, a reflecting film is arranged in the edge area, or a reflecting film is arranged in the central area and a through hole is formed in the reflecting film in the edge area; the reflecting film and the mini LED lamp source are arranged on the same side of the substrate and are arranged opposite to the optical film material.

2. The mini LED backlight module as claimed in claim 1, wherein the optical film material comprises one or more of a diffusion film, a brightness enhancement film and a quantum film.

3. The mini LED backlight module of claim 1, further comprising a diffuser plate disposed above the mini LED light source.

4. The mini LED backlight module as claimed in claim 1, wherein the plurality of mini LED light sources are arranged in an array on the substrate.

5. The mini LED backlight module as claimed in claim 4, wherein the distance between the arrays of adjacent mini LED light sources is equal.

6. The mini LED backlight module as claimed in claim 1, wherein the thickness of the reflective film is 50-300 μm, the reflectivity is not less than 97%, and the thermal shrinkage ratio MD is not more than 0.5/TD is not more than 0.2.

7. The mini LED backlight module of claim 1, wherein the mini LED lamp panel further comprises white reflective ink covering one side of the substrate close to the optical film.

8. The mini LED backlight module as claimed in claim 1, wherein the substrate is an electrolytic lead-free galvanized steel plate substrate or an aluminum substrate.

9. The mini LED backlight module as claimed in claim 1, wherein the mini LED lamp panels are spliced together by filling resin material.

10. A subjective edge optimization method of a mini LED backlight module is characterized by comprising the following steps:

judging the brightness of the edge area of the mini LED backlight module;

when the brightness of the edge area of the mini LED backlight module is lower than that of the central area, a reflecting film is attached to the edge area of the substrate of the mini LED backlight module;

when the brightness of the edge area of the mini LED backlight module is higher than that of the central area, a reflecting film is attached to the substrate of the mini LED backlight module, and the edge area of the reflecting film is provided with a through hole.

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