CN114355667B

CN114355667B - Mini LED backlight module and subjective edge optimization method thereof

Info

Publication number: CN114355667B
Application number: CN202111565890.7A
Authority: CN
Inventors: 温存
Original assignee: Konka Group Co Ltd
Current assignee: Konka Group Co Ltd
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2023-08-25
Anticipated expiration: 2041-12-20
Also published as: CN114355667A

Abstract

The invention provides a mini LED backlight module and a subjective edge optimization method thereof. The mini LED backlight module comprises a screen, an optical film material and a mini LED lamp panel which are sequentially arranged. The mini LED lamp panels comprise a substrate and a plurality of mini LED lamp sources arranged on the substrate, wherein 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 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 under different conditions, realize the subjective edge optimization of different mini LED backlight modules, improve the light emitting uniformity 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, application of mini LEDs as backlight sources to LCD (Liquid crystal displays, liquid crystal display) panels can significantly improve display image quality such as contrast and brightness, and thus has received increasing attention from the market. The mini LED backlight technology is to bind an LED (Light Emitting Diode ) chip to a backboard with a driving circuit, and realize dynamic backlight by controlling the LED partition to emit light through the driving circuit. The more the number of partitions of the mini LED backlight is, the more the number of lamps of the LED is, the finer the backlight control is, and the LCD can realize the display quality with thinner appearance, higher brightness and large contrast by carrying the backlight technology.

However, since the mini LED backlight module is thinner than the conventional direct type backlight module, an OD (optical density) of the mini LED backlight module is smaller. When the OD value is smaller, the light emitted by the mini LED cannot be fully mixed, and particularly the positions of the peripheral edges are poor in subjective edge visual effect of the backlight module. In the prior art, the backlight module with a larger OD value can improve the angle of the edge light emission through adjusting the angle of the overlapping edge of the reflecting sheet, so that the edge transition is uniform, but because the OD of the mini LED module is smaller, and in order to ensure the universality of the lamp panel, the angle cannot be adjusted by using the overlapping edge of the reflecting sheet, no solution exists in the prior art, and the development of the mini LED backlight is affected by the subjective visual effect of the backlight module.

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 invention is that the light cannot be fully mixed when the OD value of the mini LED backlight module in the prior art is smaller, so that the visual effect of the peripheral edge position is poor, and in order to ensure the universality of a lamp panel, the angle cannot be adjusted by using the overlapping edge of the reflecting sheet, so that the subjective edge visual effect of the mini LED backlight module is poor, therefore, the mini LED backlight module and the subjective edge optimization method thereof are necessary to be provided for solving the problems.

The technical scheme adopted for solving the technical problems 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 plurality of mini LED lamp panels which are sequentially arranged, wherein each 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 diffusion film, a brightness enhancing film, and a quantum film.

In one implementation, the mini LED backlight module further includes a diffusion plate disposed above the mini LED light source.

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

In one implementation, the distances between adjacent arrays of mini LED light sources are equal.

In one implementation, the reflective film has a thickness of 50-300 microns, a reflectance of not less than 97%, and a heat shrinkage MD of 0.5/TD of 0.2.

In one implementation, the mini LED lamp panel further includes white reflective ink covering a side of the substrate adjacent to the optical film.

In one implementation, the substrate is an electrolytic lead-zinc-plated steel plate substrate or an aluminum substrate.

In one implementation, a plurality of mini LED lamp panels are spliced by filling resin materials.

In a second aspect, the present invention further provides a subjective edge optimization method of 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.

The beneficial effects are that: according to the technical scheme provided by the invention, the reflective film is arranged at the peripheral edge of the substrate, part of light rays emitted by the mini LED light source returns to the reflective film, the reflective film reflects the irradiated light rays back to the optical film material by utilizing the high reflectivity of the reflective film, so that the recycling of the light rays is realized, the output of brightness is improved, the subjective excessive uniformity of the edge of the display screen is realized, and the consistency of subjective image quality is improved. Or a reflecting film is attached to the substrate, and through holes are formed in the peripheral edges of the reflecting film, so that the brightness of the peripheral edges of the mini LED backlight module is consistent with the central brightness, and the subjective transition uniformity of the edges of the display screen is realized. Meanwhile, the subjective edge optimization method of the mini LED backlight module provided by the invention can be used for carrying out different selections according to the peripheral edge conditions of the mini LED backlight module, different settings can be made according to different conditions, the design under different conditions is met, the subjective edge optimization of different mini LED backlight modules is realized, the light emitting uniformity is improved, and the consistency of subjective image quality is improved.

Further embodiments of the invention also enable other advantageous technical effects, not listed one after another, which may be partly described below and which are anticipated and understood by a person skilled in the art after reading the present invention. This summary is intended to introduce a selection of concepts and choices in a simplified form that are further described below in the detailed description to facilitate a more thorough understanding of the present 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 concerning structures and methods 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. Therefore, many restrictive explanations of the present disclosure cannot be understood without further reading the entire specification and claims and drawings.

Drawings

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

fig. 2 is a schematic structural diagram of a first embodiment of a mini LED backlight module provided by the present invention;

fig. 3 is a schematic structural diagram of a second embodiment of the mini LED backlight module provided by the present invention;

fig. 4 is a flowchart of specific steps of a subjective edge optimization method of a mini LED backlight module provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer and more specific, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. 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. The term "and/or" as used herein includes all or any element and all combination 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 or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the embodiments of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be mechanically connected, may be electrically connected, or may be in communication with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

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 is intended to include the plural 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, if a detailed description of known functions and configurations incorporated herein will obscure the subject matter of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted. Those skilled in the art will appreciate that any feature shown in the drawings may be enlarged, reduced, or simplified for ease of description, and that the drawings and elements of the drawings are not always shown to scale.

First embodiment

The invention provides a mini LED backlight module which comprises a screen, optical film materials and mini LED lamp panels which are sequentially arranged, wherein the mini LED lamp panels comprise a plurality of substrates and a plurality of mini LED lamp sources arranged on the substrates, the substrates comprise 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 this embodiment, please refer to fig. 1 and fig. 2 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. 2 is a schematic diagram of a structure of a first embodiment of a mini LED backlight module provided by the present invention.

In this embodiment, a mini LED backlight module 100 is provided, which includes a screen 11, an optical film 12, and a mini LED lamp panel 13 that are sequentially set. The mini LED lamp panel 13 is formed by splicing a plurality of pieces, the mini LED lamp panel 13 comprises a substrate 131 and a plurality of mini LED lamp sources 132 arranged on the substrate 131, the substrate 131 comprises a central area and an edge area, and the mini LED lamp panel 13 further comprises a reflecting film 133 arranged on the edge area. The reflecting film 133 and the mini LED lamp 132 are disposed on the same side of the substrate 131, and are disposed at intervals opposite to the optical film 12. Further, a plurality of mini LED lamp panels 13 are spliced by filling resin materials.

Specifically, in this embodiment, the screen 11 is a glass screen, so as to implement the colorization and display functions of the mini LED backlight module. The substrate 131 is a substrate made of an electrolytic lead zinc-plated steel sheet or an 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 roles of light divergence and convergence, and improves the uniformity of the overall picture of the mini LED backlight module 100. The diffusion film plays a role in correcting the diffusion angle in the backlight module, so that the light radiation area is increased, but the light intensity of a unit area is reduced, namely the brightness is reduced. After the luminous light source is diffused by the diffusion film, the luminous light source can become a 2-time light source with larger area, better uniformity and stable chromaticity. The diffusion film is constructed by coating optically diffusing particles on both sides of a transparent substrate such as PET. The incremental film is a film or sheet applied in the mini LED backlight module 100 to improve the luminous efficiency of the entire backlight system. The quantum film is used for reflecting more light rays and has the functions of dispersing and converging light.

In some embodiments, the mini LED backlight module 100 further includes a diffusion plate (not labeled in the figures) disposed above the mini LED light sources. The diffusion plate is used for absorbing light rays emitted by the mini LED lamp source, when the light rays are emitted to all light guide points, reflected light can be diffused towards all angles, then the reflection conditions are destroyed and emitted from the front surface of the diffusion plate, and the diffusion plate can uniformly emit light through the light guide points with different densities and sizes. In this embodiment, the reflective film reflects the light with the exposed bottom surface back into the diffusion plate, so as to improve the light use efficiency.

Further, the mini LED backlight module 100 may be formed by splicing different amounts of the mini LED lamp panels 13, the mini LED lamp panels 13 are used for providing backlight brightness output, and specifications, positions and the like of the mini LED light sources play a decisive role in overall subjective visual effect of the mini LED backlight module 100. The mini LED light sources 132 are welded on the surface of the substrate 131, and a plurality of mini LED light sources 132 are arranged on the substrate 131 in an array arrangement mode. Preferably, the distances between the arrays of adjacent mini LED light sources 132 are equal. The array distribution mode among the mini LED lamp sources enables the mini LED backlight module to emit light more uniformly.

The mini LED lamp panel 13 further includes white reflective ink 134, i.e. white oil, covering the side of the substrate 131 close to the optical film 12. The white oil 134 can function as reflected light. Further, the thickness of the reflective film 133 provided by the invention is 50-300 micrometers, 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

As can be seen from table 1, the light panel surface has a reflective film or not, and the difference in brightness is about 42% for the whole, i.e., the reflective film has a brightness higher than that of the reflective film not adhered by about 42%. Referring to fig. 3 in combination, fig. 3 is a graph of test results of the mini LED backlight module shown in fig. 2, in which the mini LED backlight module 100 provided by the present invention returns a portion of light emitted by the mini LED light source 132 to the reflective film 133, and the reflective film 133 uses its high reflectivity to repeatedly reflect the irradiated light back to the optical film 12, so as to improve the output of brightness, and effectively enhance the brightness of the edge area of the mini LED light panel.

The working principle of the mini LED backlight module 100 is as follows: 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 passes through the screen 11, and the light is changed by twisted liquid crystal molecules in a liquid crystal electric field in the screen 11 and irradiates on color filters in the screen 11 in different proportions, so that different colors are generated to realize the display of pictures. At this time, the reflective film 133 of the mini LED lamp panel 13 reflects the irradiated light back to the optical film material 12 repeatedly, so as to improve the output of the brightness of the edge area and improve the subjective image quality consistency of the mini LED backlight module 100.

Second embodiment

Referring to fig. 1 and fig. 3 in combination, fig. 1 is a schematic overall structure of a mini LED backlight module according to the present invention, and fig. 3 is a schematic structural diagram of a second embodiment of a mini LED backlight module according to the present invention. In this embodiment, a mini LED backlight module 200 is provided, which includes a screen 11, an optical film 12, and a mini LED lamp panel 13 that are sequentially set. The mini LED lamp panel 13 is formed by splicing a plurality of pieces, the mini LED lamp panel 13 comprises a substrate 231, mini LED lamp sources 232 arranged on the substrate 231 and reflecting films 233 attached to the substrate 231, through holes 2331 are formed in the peripheral edges of the reflecting films 233, and the reflecting films 233 and the mini LED lamp sources 232 are arranged on the same side of the substrate 231 and are arranged at opposite intervals with the optical films 232. Specifically, the specific structures of the screen 11 and the optical film 12 are the same as those in the first embodiment, and detailed description thereof is omitted in this embodiment. Further, the through hole 2331 is a circular hole.

In this embodiment, when the brightness of the edge area of the mini LED backlight module 200 is greater than that of the center area, the reflective film 233 is attached to the substrate 231, and meanwhile, the through hole 2331 is drilled at the brighter position of the edge area of the reflective film 233, so that the position brightness output of the mini LED lamp panel 23 corresponding to the through hole 2331 is reduced, and the overall subjective and excessive uniformity is made. 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 22 by recycling, so that the brightness output of the through hole 2331 in the edge area of the reflective film is reduced, the brightness output in the edge area is reduced, and the subjective image quality consistency of the mini LED backlight module 200 is improved.

Third embodiment

Referring to fig. 4 specifically, the invention further provides a subjective edge optimization method of the 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, attaching a reflecting film to the edge area of the substrate of the mini LED backlight module;

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 general, according to the mini LED backlight module 100 provided by the present invention, the reflective film 133 is disposed on the edge area 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 back to the optical film material 12, which improves the output of the brightness of the edge area and the subjective image quality consistency of the mini LED backlight module 100; or the reflective film 233 is attached to the substrate 231, and through holes are formed in the edges of the periphery of the reflective 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 provided by the invention can be used for carrying out different selections according to the peripheral edge conditions of the mini LED backlight module, different settings can be made according to different conditions, the design under different conditions is met, the subjective edge optimization of different mini LED backlight modules is realized, the light emitting uniformity is improved, and the consistency of subjective image quality is improved.

Finally, it should be noted that: the above description is illustrative of exemplary embodiments and should not be taken as limiting the exemplary embodiments. 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 description 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

1. The mini LED backlight module is characterized by comprising a screen, an optical film material and mini LED lamp panels which are sequentially arranged, wherein the mini LED lamp panels comprise a plurality of substrates and a plurality of mini LED lamp sources arranged on the substrates, the substrates comprise 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 miniLED lamp source are arranged on the same side of the substrate and are opposite to the optical film material;

the mini LED backlight module further comprises a diffusion plate, and the diffusion plate is arranged above the mini LED light source;

the diffusion plate is used for absorbing light rays emitted by the mini LED lamp sources, when the light rays are emitted to all light guide points, the reflected light can be diffused towards all angles, then the reflection conditions are destroyed and emitted from the front surface of the diffusion plate, and the diffusion plate uniformly emits light through all light guide points with different densities and sizes;

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

2. The mini LED backlight module of 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 according to claim 1, wherein a plurality of the mini LED light sources are arranged in an array arrangement on the substrate.

4. The mini LED backlight module of claim 3, wherein the distance between adjacent arrays of mini LED light sources is equal.

5. The mini LED backlight module according to claim 1, wherein the thickness of the reflective film 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.

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

7. The mini LED backlight module of claim 1, wherein the substrate is an electrolytic lead-plated zinc-plated steel plate substrate or an aluminum substrate.

8. The mini LED backlight module of claim 1, wherein a plurality of the mini LED lamp panels are spliced by filling resin material.

9. A subjective edge optimization method based on the mini LED backlight module of any one of claims 1-8, comprising the steps of:

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