CN113791507A - Backlight module and display device - Google Patents

Backlight module and display device Download PDF

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Publication number
CN113791507A
CN113791507A CN202111115136.3A CN202111115136A CN113791507A CN 113791507 A CN113791507 A CN 113791507A CN 202111115136 A CN202111115136 A CN 202111115136A CN 113791507 A CN113791507 A CN 113791507A
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CN
China
Prior art keywords
ink
plate
backlight module
light
light source
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Granted
Application number
CN202111115136.3A
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Chinese (zh)
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CN113791507B (en
Inventor
杨凡
王鑫
张阳阳
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Priority to CN202111115136.3A priority Critical patent/CN113791507B/en
Publication of CN113791507A publication Critical patent/CN113791507A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

Abstract

The application provides a backlight module and display device, backlight unit includes backplate, end reflector plate, side reflector plate and a plurality of light source, and the backplate includes the bottom plate and sets up the curb plate in the at least one side of bottom plate, and end reflector plate sets up the one side at the bottom plate, and the one side of bottom plate is kept away from at bottom reflector plate to a plurality of light source settings, and the side reflector plate sets up the one side that is close to the bottom plate at the curb plate. Through set up the side reflector plate on the curb plate, when the light that a plurality of light sources sent shined on the curb plate, through on the side reflector plate with light reflection quantum dot membrane, consequently can make more blue light pass quantum dot membrane after output, reduced the blue light of revealing along backlight unit's edge, on the other hand reflection through the side reflector plate has also improved bottom reflector plate luminance all around, has improved the picture of liquid crystal display panel all around and has sent blue and the problem of darkening from this.

Description

Backlight module and display device
Technical Field
The application relates to the technical field of display, in particular to a backlight module and a display device.
Background
With the development of display technology, micro (Mini) Light Emitting Diodes (LEDs) are increasingly widely used. The Mini-LED integrates the advantages of high resolution, low power consumption, high brightness, high color saturation and the like due to the small distance between the pixel points. Compared with the traditional LED backlight display device, the display device adopting the MiniLED backlight technology has better performance on dynamic contrast, brightness, color gamut and visual angle, and has the advantages of lightness, thinness, high image quality, low power consumption, energy conservation and the like.
In the existing display device, a blue LED chip is usually used in conjunction with a quantum dot film, and the high-energy blue light is used to excite the quantum dot film to generate red-green light, so as to mix the red-green light into white light. However, the conventional display device has the problems of dark and blue display screen periphery, and the display quality is affected.
Disclosure of Invention
The application provides a backlight module and a display device aiming at the defects of the prior art, and is used for solving the problems that the display device in the prior art has dark and blue display picture.
In a first aspect, an embodiment of the present application provides a backlight module, including:
the back plate comprises a bottom plate and a side plate arranged on at least one side of the bottom plate;
the bottom reflector plate is arranged on one side of the bottom plate;
the light sources are arranged on one side, far away from the bottom plate, of the bottom reflector plate;
the side reflector plate is arranged on one side of the side plate close to the light source, close to the bottom plate, and used for reflecting blue light emitted to the edge of the backlight module into the backlight module.
Optionally, the light sources include Mini-LEDs, the light sources are arranged at intervals and in an array, the bottom reflector includes an ink coating area, the ink coating area is close to the periphery of the bottom reflector, and ink is coated around the light sources in the ink coating area.
Optionally, the ink coating area comprises 4 rows or more than 4 rows of the light sources; and/or, 4 columns or more than 4 columns of the light source are included in the ink coating area.
Optionally, in the ink applying region, the number of the inks applied around the light source is multiple, and the number of the inks applied around the light source in the same row is the same; and/or the same amount of ink is applied around the light sources in the same column.
Optionally, in the ink applying region, the amount of ink applied around the light source near the periphery of the base plate is greater than or equal to the amount of ink applied around the light source far from the periphery of the base plate.
Optionally, in the ink coating area, the size of the ink coated around the light source in the same row is the same; and/or, the ink coated around the light source in the same column has the same size in the ink coated area.
Optionally, in the ink application region, the size of the ink applied around the light source near the periphery of the base plate is greater than or equal to the size of the ink applied around the light source far from the periphery of the base plate.
Optionally, the shape of the ink is circular, and the diameter of the ink is greater than or equal to 0.6 mm and less than or equal to 2 mm.
Optionally, the backlight module further includes a diffuser plate located on one side of the bottom reflector plate away from the bottom plate, a quantum dot film located on one side of the diffuser plate away from the bottom reflector plate, and a composite brightness enhancement film located on one side of the quantum dot film away from the diffuser plate.
Optionally, the composite brightness enhancement film includes a core layer, a first prism layer, and a second prism layer, which are stacked, and light transmission axes of the first prism layer and the second prism layer are perpendicular to each other.
Optionally, in the ink application region, the center of the ink is located at the position where the light intensity between two adjacent light sources is maximum.
Optionally, the concentration of the ink is greater than or equal to 8% and less than or equal to 20%.
Optionally, the surface of the side reflection sheet far away from the side plate is coated with a fluorescent material.
Optionally, the backlight module further includes a diffusion sheet disposed opposite to the bottom reflector, the diffusion sheet is located on a side of the bottom reflector away from the bottom plate, a distance between the diffusion sheet and the bottom reflector is greater than 5 mm, and a distance between the light sources is greater than 10 mm;
and the concentration of the fluorescent material is gradually reduced along the direction from the bottom reflecting sheet to the diffusion sheet on the surface of the side reflecting sheet far away from the side plate.
In a second aspect, an embodiment of the present application provides a display device, where the display device includes the backlight module in the embodiment of the present application.
The beneficial technical effects brought by the technical scheme provided by the embodiment of the application comprise:
the backlight module in this application embodiment includes backplate, end reflector plate, side reflector plate and a plurality of light source, and the backplate includes the bottom plate and sets up the curb plate in at least one side of bottom plate, and end reflector plate sets up the one side at the bottom plate, and a plurality of light source settings keep away from the one side of bottom plate at end reflector plate, and the side reflector plate sets up the one side that is close to the bottom plate at the curb plate. Through set up the side reflector plate on the curb plate, when the light that a plurality of light sources sent shined on the curb plate, through the side reflector plate with light reflection to backlight unit in, consequently can make more blue light pass quantum dot membrane back output, reduced the blue light of revealing along backlight unit's edge, on the other hand reflection through the side reflector plate has also improved bottom reflector plate luminance all around, has improved the picture of liquid crystal display panel all around and has sent blue and the problem of darkening from this.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of the position of a blue light leakage region;
FIG. 3 is a schematic view of an ink application area on a bottom reflector plate in an embodiment of the present application;
FIG. 4 is an enlarged schematic view of an ink applied around a light source in an embodiment of the present application;
FIG. 5 is a schematic view of the center position of the ink between two light sources;
FIG. 6 is a schematic view of the areas of the side reflecting sheet coated with different concentrations of fluorescent materials;
FIG. 7 is a graph comparing the brightness variation of the uncoated ink state and the coated ink state along the center to the edge area of the display area;
fig. 8 is a schematic structural diagram of a display device in an embodiment of the present application.
In the figure:
10-a backlight module; 11-a back plate; 111-a backplane; 112-side plate;
12-a bottom reflector sheet; 13-side reflective sheet; 14-a light source; 140-protective glue; a-an ink application zone; 100-ink;
101-an optical film material; 15-a diffusion plate; 16-a quantum dot film; 17-a composite brightness enhancement film; 171-a core layer; 172-a prism layer;
18-middle frame; 21-a liquid crystal display panel; 2-display device.
Detailed Description
Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
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.
The inventor of the application considers that in the existing display panel adopting the backlight module, in order to improve the color gamut, a light source in the backlight module adopts a blue light Mini-LED, and the blue light Mini-LED is matched with a quantum dot film and excites the quantum dot film to generate red-green light by utilizing high-energy blue light so as to mix the red-green light into white light. However, at the edge of the quantum dot film, blue light leaks along the edge, that is, the blue light is directly output without being converted by the quantum dot film, and macroscopically appears as bluing and darkening of the picture around the display panel, which affects the display quality.
The application provides a backlight unit aims at solving the technical problem as above that prior art exists.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments.
The embodiment of the present application provides a backlight module 10, and the structure of the backlight module 10 is as shown in fig. 1, including:
a back panel 11 including a bottom panel 111 and a side panel 112 disposed at least one side of the bottom panel 111;
a bottom reflection sheet 12 disposed at one side of the base plate 111;
a plurality of light sources 14 disposed on a side of the bottom reflection sheet 12 away from the bottom plate 111;
and the side reflection sheet 13 is arranged on one side of the side plate 112 close to the light source 14, the side reflection sheet 13 is close to the bottom plate 111, and the side reflection sheet 13 is used for reflecting the blue light emitted to the edge of the backlight module 10 into the backlight module 10.
Specifically, as shown in fig. 1, the back panel 11 includes a bottom panel 111 and side panels 112, and the side panels 112 are disposed around the bottom panel 111. The bottom reflection sheet 12 is provided on the base plate 111, and the plurality of light sources 14 are provided on the bottom reflection sheet 12. An optical film 101 is disposed above the light source 14, and light emitted from the light source 14 is reflected by the bottom reflector 12 and then emitted through the optical film 101 as output light of the backlight module 10 to provide backlight for a liquid crystal display panel (not shown). In the embodiment of the application, the light source 14 is a blue Mini-LED, the optical film material 101 includes the quantum dot film 16, and the blue light emitted by the light source 14 can excite the quantum dot material in the quantum dot film 16 to generate green light and red light, and the green light and the red light are mixed to form white light output to be used as output light of the backlight module 10.
Ideally, it is desirable that the light emitted from the light source 14 is output after all of the light passes through the quantum dot film 16. However, at the edge of the quantum dot film 16 (also at the position near the side plate 112 around the bottom plate 111), there is a leakage of part of the blue light, i.e. the blue light is directly output without being converted by the quantum dot film 16, so that the blue light component in the light output by the backlight module 10 is more at the edge of the backlight module 10. In addition, since the light reflected on the bottom reflection sheet 12 is less near the center near the side plates 112, the light is darker around the bottom reflection sheet 12. Combining the above factors, the backlight module 10 appears as a blue-and-dark-around picture of the liquid crystal display panel in macroscopic vision when providing the backlight to the liquid crystal display panel, which affects the display effect. With reference to fig. 1 and 2, the backlight module 10 provides backlight to the lcd panel, and the edge of the display area (i.e. the periphery of the display screen) is a blue light leakage area with widths of L1, L2, L3 and L4. The width of the blue light leakage region is related to the distance between the light source 14 and the distance between the bottom reflection sheet 12 and the optical film 101, and generally, the larger the distance between the bottom reflection sheet 12 and the optical film 101 is, the smaller the width of the blue light leakage region is.
By arranging the side reflection sheet 13 on the side plate 112, when light emitted by the light source 14 is irradiated on the side plate 112, the light is reflected onto the quantum dot film 16 through the side reflection sheet 13, so that more blue light can pass through the quantum dot film 16 and then be output, and the blue light directly output from the edge of the quantum dot film 16 is reduced; on the other hand, the brightness around the bottom reflector 12 is also increased by the reflection of the side reflector 13, thereby improving the problems of the blue and dark around the screen of the liquid crystal display panel. It should be noted that, the color selected by the side reflection sheet 13 may be white or yellow, and when the side reflection sheet 13 is yellow, absorption of blue light in light may be enhanced, which is beneficial to further reducing leakage of blue light. The material, size, reflectivity, and other parameters of the side reflective sheet 13 can be determined according to practical situations, and are not limited herein.
The specific type and size of the light source 14 can be determined according to actual conditions, in order to reduce the pixel distance to improve the resolution, and simultaneously improve the color saturation and reduce the power consumption, a Mini-LED is adopted as the light source 14 in the embodiment of the present application, and the size of the Mini-LED chip is usually 500 micrometers (um) × 100 micrometers (um). In some embodiments of the present application, the light sources 14 comprise Mini-LEDs, and the plurality of light sources 14 are spaced apart and arranged in an array.
To further reduce the leakage of blue light at the edges of the quantum dot film 16, in some embodiments of the present application, the bottom reflector 12 includes an ink coated region near the perimeter of the bottom reflector 12 in which the ink 100 is coated around the plurality of light sources 14.
Referring to fig. 1, 3 and 4, an ink coating area a is disposed around the bottom reflector 12, and the ink coating area a is close to the side plate 112 and corresponds to the edge of the quantum dot film 16. Each light source 14 is covered with a protective adhesive 140 to prevent damage to the light source 14 after impact. The shape of the protective adhesive 140 may be circular, and the diameter of the protective adhesive is usually in the range of 2.5 mm to 2.8 mm, and the height of the protective adhesive is in the range of 0.5 mm to 0.8 mm, which may be determined according to actual situations. The squares in fig. 4 represent the light sources 14, the inner circles around the squares represent the protective paste 140, and the outer circles around the squares represent the cutouts in the bottom reflector to place the light sources 14 and the protective paste 140. In the ink coating area a, the ink 100 is coated around the protective adhesive 140 of the light source 14, and the ink 100 may be fluorescent ink 100, which can enhance the reflection of the bottom reflector 12 to light, improve the problem of dark light around the bottom reflector 12, and absorb blue light in light, so as to reduce the leakage of blue light at the edge of the quantum dot film 16. To ensure the blue light absorption effect of the ink 100, the concentration of the ink 100 can be determined according to the chromaticity of the light source 14 and the wavelength of the emitted light, for example, when the wavelength of the light source 14 is 450 nm to 460 nm, the concentration of the corresponding ink 100 is 8% to 20%. When the wavelength of the light source 14 is changed, the concentration of the ink 100 also needs to be adjusted accordingly, and the larger the wavelength of the light source 14 is, the larger the concentration of the ink 100 is.
After the ink 100 is coated near the light source 14 near the periphery of the bottom reflector 12, when the blue light emitted from the light source 14 irradiates the bottom reflector 12, a part of the blue light is absorbed by the coated ink 100, so that the blue light at the periphery of the bottom reflector 12 corresponding to the edge of the quantum dot film 16 can be reduced, and the blue light directly output from the edge of the quantum dot film 16 can be reduced.
It should be noted that the size range of the ink application area a can be adjusted according to actual conditions. The larger the range of the ink coating area A is, the more the light sources 14 coated with the ink 100 are, so that the absorption of blue light is increased, and the leakage of the blue light at the edge of the quantum dot film 16 is reduced. Optionally, in some embodiments of the present application, the ink application area a includes 4 rows or more than 4 rows of light sources 14; and/or, the ink application area a includes 4 or more than 4 rows of light sources 14. Referring to fig. 1, 3 and 4, the area where four rows and four columns of light sources 14 are located near the periphery of the bottom reflector 12 is set as an ink coating area a, and the ink 100 is coated around the protective adhesive 140 of the light sources 14 located in the ink coating area a. It should be noted that the circles in fig. 3 represent the holes of the reflector, but not the light source 14, and the light source 14 and the ink 100 are not shown in fig. 3.
In the ink applying region a, the ink 100 may be applied around a part of the light sources 14 in each row or each column, or the ink 100 may be applied around all the light sources 14 in each row or each column, one ink 100 may be applied around the light sources 14, or a plurality of inks 100 may be applied around the light sources 14, and the number of the light sources 14 coated with the ink 100 around each row or each column may be determined according to actual conditions. Optionally, in some embodiments of the present application, the number of the inks 100 coated around the light sources 14 in the ink coating area a is multiple, and the number of the inks 100 coated around the light sources 14 in the same row is the same; and/or the same amount of ink 100 is applied around the same column of light sources 14. By making the number of the ink 100 coated around the plurality of light sources 14 in the same row or the same column the same, the process of coating the ink 100 can be simplified, and the manufacturing of the backlight module 10 is easier. In addition, the distribution of the ink 100 is more uniform, and the uneven color of the light at the edge of the backlight module 10 is avoided.
The light source 14 may be coated with one ink 100 or may be coated with a plurality of inks 100. As shown in fig. 4, the number of the inks 100 applied around the light source 14 is 8, and the number of the inks 100 around the light source 14 may be determined according to actual conditions. The greater the amount of ink 100 applied around the light source 14, the better the blue light absorption. The amount of ink 100 applied around the light source 14 in the ink application area a between different rows and different columns may be determined according to the actual situation. Optionally, in some embodiments of the present application, the amount of ink 100 coated around the light source 14 near the periphery of the base plate 111 in the ink coating area a is greater than or equal to the amount of ink 100 coated around the light source 14 far from the periphery of the base plate 111. That is, the closer to the edge of the bottom plate 111, the more the amount of the ink 100 coated around the light source 14 may be, and the farther away from the edge of the bottom plate 111, the less the amount of the ink 100 coated around the light source 14 may be, so that the amount of the ink 100 may also be reduced while the blue light leakage at the edge of the quantum dot film 16 is ensured, thereby saving the cost.
Alternatively, in a specific embodiment of the present application, the number of the inks 100 coated around the light source 14 in the first to fourth rows is 8, and 4 respectively along the direction from the edge of the bottom reflector 12 to the center of the bottom reflector 12 (refer to the first direction in fig. 3 and 4). It should be noted that fig. 4 only shows the case where the numbers of the inks applied in the first to 4 th rows are 8, and 4, respectively, and the numbers of the inks 100 applied around the light source 14 in the first to fourth columns may also be 8, and 4, respectively, in the second direction (refer to the second direction in fig. 3 and 4) perpendicular to the first direction.
In the ink application area a, among the plurality of light sources 14 in the same row or the same column, the sizes of the inks 100 applied around the different light sources 14 (i.e., the sizes of the applied inks 100) may be the same or different. Optionally, in some embodiments of the present application, the ink 100 applied around the same row of light sources 14 is the same size; and/or the ink 100 applied around the same column of light sources 14 may be the same size. The ink 100 coated around the different light sources 14 in the plurality of light sources 14 in the same row or the same column has the same size, so that the process is easier, the ink 100 is more uniformly distributed, and the phenomenon that when the ink 100 is unevenly distributed, a certain area absorbs more blue light and the other part of area absorbs less blue light to cause uneven display is avoided.
The specific shape of the ink 100 may be determined according to an actual process (for example, the shape of the nozzle of the ink 100), and may be a square, a circle, or an oval. In the embodiment of the present application, as shown in fig. 4, the shape of the ink 100 is a circle. The ink 100 may be the same or different in size at different positions within the ink application area a. Alternatively, in the ink application region a, the size of the ink 100 applied around the light source 14 near the periphery of the base plate 111 is greater than or equal to the size of the ink 100 applied around the light source 14 far from the periphery of the base plate 111. That is, the closer to the edge of the bottom plate 111, the larger the size of the ink 100 coated around the light source 14 in each row or each column is, and the farther from the edge of the bottom plate 111, the smaller the size of the ink 100 coated around the light source 14 in each row or each column is, so that while blue light leakage at the edge of the quantum dot film 16 is ensured, the area of the ink 100 can also be reduced, thereby saving the cost.
When the ink 100 is circular in shape, its diameter may be between 0.6 mm and 2 mm to balance the blue light absorption effect, the manufacturing cost and the reflectivity of the bottom reflector 12. Alternatively, in a specific embodiment of the present application, the diameters of the ink 100 coated around the light source 14 in the first to fourth rows along the direction from the edge of the bottom reflector 12 to the center of the bottom reflector 12 (refer to the first direction in fig. 3 and 4) are 1 mm, 0.8 mm, 0.6 mm and 0.6 mm, respectively. In a second direction perpendicular to the first direction (refer to the second direction in fig. 3 and 4), the diameters of the inks 100 applied around the light sources 14 in the first to fourth columns are 1 mm, 0.8 mm, 0.6 mm, and 0.6 mm, respectively. It should be noted that, the number of the inks 100 may be adjusted around the light source 14 according to the size of the ink 100, the size of the ink 100 may be smaller when the number of the inks 100 is larger, and the size of the ink 100 may be larger when the number of the inks 100 is smaller, which may be determined according to actual situations.
It should be noted that the specific position of the ink 100 coated around the light source 14 can be determined according to actual situations. Alternatively, in the embodiment of the present application, the center of the ink 100 in the ink applying region a is located at the maximum light intensity between two adjacent light sources 14, and in conjunction with fig. 1 and 5, the light emitted from the light source 14 is irradiated onto the optical film 101, I0The position where the light intensity is maximum right above the light source 14; the light source 14 has a light emission angle (θ in fig. 5)1And theta2) The point a on the optical film 101 is the position of the optical film 101 between two adjacent light sources 14 where the light intensity is maximum, and the position is defined by the light emitting angle of two adjacent light sources 14, the distance (H in fig. 5) between the light source 14 and the optical film 101, and the distance I between two adjacent light sources 140The distance from one of the light sources 14 (D in fig. 5) and the distance between two adjacent light sources 14 (D in fig. 5) can be determined by the following correlation mathematical formula.
Light intensity I at point AaThe calculation formula of (2) is as follows:
Ia＝I0*cosθ1+I0*cosθ2 (1)；
θ1、θ2d, H and d satisfy the following relationships:
tanθ1＝d/H,tanθ2＝(D-d/)H (2)；
according to the formula (1) and the formula (2), the size of d can be determined when Ia is maximum, namely the position of the point A can be determined. The orthographic projection of point a on the bottom reflector 12 (position B in fig. 5) is the maximum light intensity on the bottom reflector 12 between two adjacent light sources 14, i.e. the optimal position of the center of the ink 100. By arranging the center of the ink 100 at the maximum light intensity position between two adjacent light sources 14, blue light absorption can be realized to the maximum extent, which is beneficial to reducing leakage of blue light.
To further increase the absorption of blue light at the edges of the quantum dot film 16, optionally, in some embodiments of the present application, the surface of the side reflector sheet 13 remote from the side plate 112 is coated with a fluorescent material. The fluorescent material comprises fluorescent powder, and the color of the fluorescent powder can be yellow to enhance the absorption effect on blue light, and the fluorescent powder can be determined according to actual conditions.
In some embodiments of the present application, with reference to fig. 1 and fig. 6, the backlight module 10 further includes a diffusion sheet disposed opposite to the bottom reflection sheet 12, the diffusion sheet is located on a side of the bottom reflection sheet 12 away from the bottom plate 111, a distance between the diffusion sheet and the bottom reflection sheet 12 is greater than 5 mm, and a distance between the light sources 14 is greater than 10 mm; the concentration of the fluorescent material is gradually decreased in the direction from the bottom reflection sheet 12 to the diffusion sheet at the surface of the side reflection sheet 13 away from the side plate 112.
When the distance between the diffusion sheet and the bottom reflection sheet 12 is large, the height of the side plate 112 (in the first direction) is also large. The light intensity at different positions on the side reflector 13 is different, and as the height increases, the distance from the light source 14 to the position irradiated on the side reflector 13 is far larger, and the smaller the light intensity at the position, the less blue light needs to be absorbed at the position correspondingly. By gradually reducing the concentration of the fluorescent material on the surface of the side reflecting sheet 13 along the direction from the bottom reflecting sheet 12 to the diffusion sheet (i.e. reducing the concentration of the fluorescent material on the side reflecting sheet 13 along with the increase of the height), the fluorescent material is saved while the blue light absorption is ensured, and the cost is reduced. Referring to fig. 1 and 6, in a specific embodiment, the side reflection sheet 13 is divided into A, B, C three regions in the first direction, the three regions corresponding to fluorescent material concentrations of 20%, 22.5% and 25%, respectively.
It should be noted that, in conjunction with fig. 1, fig. 2 and fig. 5, the size of the blue light leakage region (the size of L1, L2, L3 and L4 in fig. 2) is related to the distance (D in fig. 5) between the light source 14 and the distance (H in fig. 5) between the light source 14 and the optical film 101, and generally, the larger the distance between the light source 14 and the optical film 101 is, the smaller the blue light leakage region is, the larger the distance between the light sources is, and the larger the blue light leakage region is. The side reflector plate and the bottom reflector plate can have different settings aiming at different conditions, so that the manufacturing cost is saved while the blue light leakage is prevented. When the distance between the light source 14 and the optical film 101 is between 0 and 3 mm and the distance between the light sources 14 is between 5 and 10 mm, the combination of the white side reflective sheet 13 and the bottom reflective sheet 12 coated with the ink 100 is preferably selected; when the distance between the light source 14 and the optical film 101 is between 3 and 5 mm and the distance between the light sources 14 is between 5 and 8 mm, the yellow side reflective sheet 13 is preferably used, and the bottom reflective sheet 12 may not be coated with the ink 100; when the distance between the light source 14 and the optical film 101 is 5 mm or more and the distance between the light sources 14 is 10 mm or more, the concentration of the yellow phosphor applied on the side reflective sheet 13 may be changed from region to region (the concentration of the phosphor is decreased as the height increases on the side reflective sheet 13 as described above). The specific arrangement of the bottom reflection sheet 12 and the side reflection sheet 13 can be determined according to actual conditions.
As shown in fig. 7, after the ink 100 is applied on the bottom reflection sheet 12, the gradient of the brightness change from the center of the display area to the edge of the display area is smaller than that in the case where the ink 100 is not applied, that is, the problem of the darkening around the display screen can be improved after the ink is applied on the bottom reflection sheet 12. Note that, in fig. 7, the ordinate is a unit of light intensity, and the larger the abscissa is, the closer to the edge of the display area is.
In some embodiments of the present disclosure, as shown in fig. 1, the backlight module 10 further includes a diffuser plate 15 disposed on a side of the bottom reflector 12 away from the bottom plate 111, a quantum dot film 16 disposed on a side of the diffuser plate 15 away from the bottom reflector 12, and a composite brightness enhancement film 17 disposed on a side of the quantum dot film 16 away from the diffuser plate 15.
Specifically, a diffusion plate 15 is disposed above the light sources 14 and the bottom reflection sheet 12, and a quantum dot film 16 is disposed on the diffusion plate 15. The diffusion plate 15 is used for diffusing the light emitted from the light source 14 to improve the light emitting effect of the backlight module 10. The composite brightness enhancement film 17 is disposed above the quantum dot film 16, so that the brightness of light can be improved. By arranging the diffusion plate 15 and the composite brightness enhancement film 17, the optical film formed by the diffusion plate 15 and the composite brightness enhancement film 17 can diffuse and brighten light, so that the light output by the backlight module 10 is more uniform and has higher brightness. The quantum dot film 16 is arranged between different optical film materials 101, so that the difficulty of arranging the quantum dot film 16 in the backlight module 10 is reduced. In order to further improve the brightness of the light output from the backlight 10, the composite brightness enhancement film 17 in some embodiments of the present application optionally includes a core layer 171 and a prism layer 172 disposed in a stacked manner. The prism layer 172 includes a first prism layer and a second prism layer (both not shown), and the transmission axes of the first prism layer and the second prism layer are perpendicular to each other. By making the transmission axes of the first prism layer and the second prism layer in the prism layer 172 perpendicular, the brightness enhancement effect of the composite brightness enhancement film 17 can be maximized.
Based on the same inventive concept, the embodiment of the present application further provides a display device 2, as shown in fig. 8, the display device 2 includes the backlight module 10 and the liquid crystal display panel 21 provided in the embodiment of the present application, the liquid crystal display panel 21 is disposed opposite to the backlight module 10, the backlight module 10 provides backlight for the liquid crystal display panel 21, and the middle frame 18 is used for supporting the liquid crystal display panel 21. Since the display device 2 includes the backlight module 10 provided in the embodiment of the present application, the display device 2 has the same advantages as the backlight module 101, and details are not repeated here.
By applying the embodiment of the application, at least the following beneficial effects can be realized:
1. in the backlight module 10 of the embodiment of the application, the side reflective sheet 13 is disposed on the side plate 112 in the back plate 11, when light emitted from the light source 14 is irradiated onto the side plate 112, the light is reflected back to the middle area of the backlight module 10 through the side reflective sheet 13, so that more blue light can pass through the quantum dot film 16 and be output, the blue light directly output from the edge of the quantum dot film 16 is reduced, and on the other hand, the brightness around the bottom reflective sheet 12 is also improved through the reflection of the side reflective sheet 13, thereby improving the problems of bluing and darkening around the picture of the liquid crystal display panel 21.
2. The ink 100 is coated near the light source 14 near the periphery of the bottom reflector 12, and when the blue light emitted by the light source 14 irradiates the bottom reflector 12, a part of the blue light is absorbed by the coated ink 100, so that the blue light at the periphery of the bottom reflector 12 corresponding to the edge of the quantum dot film 16 can be reduced, and the blue light directly output from the edge of the quantum dot film 16 can be reduced.
3. By making the number of the ink 100 coated around the plurality of light sources 14 in the same row or the same column the same, the process of coating the ink 100 can be simplified, and the manufacturing of the backlight module 10 is easier. In addition, the distribution of the ink 100 is more uniform, and the uneven color of the light at the edge of the backlight module 10 is avoided.
4. The number of the ink 100 coated around the light source 14 is larger at the edge close to the bottom plate 111, and the number of the ink 100 coated around the light source 14 is smaller at the edge far from the bottom plate 111, so that the number of the ink 100 can be reduced while blue light leakage at the edge of the quantum dot film 16 is ensured, and the cost is saved.
5. By arranging the center of the ink 100 at the maximum light intensity position between two adjacent light sources 14, blue light absorption can be realized to the maximum extent, which is beneficial to reducing leakage of blue light.
6. The surface of the side reflection sheet 13 far away from the side plate 112 is coated with a fluorescent material, so that the absorption of blue light can be further enhanced, and the problems of blue light emission and dark light emission around the display panel picture caused by blue light leakage can be solved.
7. By gradually reducing the concentration of the fluorescent material on the surface of the side reflecting sheet 13 along the direction from the bottom reflecting sheet 12 to the diffusion sheet, namely, reducing the concentration of the fluorescent material on the side reflecting sheet 13 along with the increase of the height, the fluorescent material is saved while the blue light absorption is ensured, and the cost is reduced.
It will be understood by those skilled in the art that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.

Claims (15)

1. A backlight module, comprising:
the back plate comprises a bottom plate and a side plate arranged on at least one side of the bottom plate;
the bottom reflector plate is arranged on one side of the bottom plate;
the light sources are arranged on one side, far away from the bottom plate, of the bottom reflector plate;
the side reflector plate is arranged on one side of the side plate close to the light source, close to the bottom plate, and used for reflecting blue light emitted to the edge of the backlight module into the backlight module.
2. The backlight module according to claim 1, wherein the light sources comprise Mini-LEDs, the light sources are spaced apart and arranged in an array, the bottom reflector comprises an ink coating area, the ink coating area is disposed near the periphery of the bottom reflector, and the periphery of the light sources in the ink coating area is coated with ink.
3. The backlight module as claimed in claim 2, wherein the ink applying region comprises 4 rows or more than 4 rows of the light sources; and/or, 4 columns or more than 4 columns of the light source are included in the ink coating area.
4. The backlight module according to claim 3, wherein the number of the inks coated around the light sources in the ink coating region is plural, and the number of the inks coated around the light sources in the same row is the same; and/or the same amount of ink is applied around the light sources in the same column.
5. The backlight module according to claim 4, wherein the amount of ink applied to the periphery of the light source near the periphery of the base plate in the ink applying region is greater than or equal to the amount of ink applied to the periphery of the light source far from the periphery of the base plate.
6. The backlight module according to claim 3, wherein the ink applied around the light sources in the same row has the same size in the ink applying region; and/or, the ink coated around the light source in the same column has the same size in the ink coated area.
7. The backlight module according to claim 6, wherein the size of the ink applied to the periphery of the light source near the periphery of the base plate in the ink applying region is greater than or equal to the size of the ink applied to the periphery of the light source far from the periphery of the base plate.
8. A backlight module according to claim 7, wherein the ink is circular in shape and has a diameter greater than or equal to 0.6 mm and less than or equal to 2 mm.
9. The backlight module according to any one of claims 1-8, further comprising a diffuser plate on a side of the bottom reflector away from the bottom plate, a quantum dot film on a side of the diffuser plate away from the bottom reflector, and a composite brightness enhancement film on a side of the quantum dot film away from the diffuser plate.
10. The backlight module as recited in claim 9 wherein the composite brightness enhancement film comprises a core layer, a first prism layer and a second prism layer disposed in a stack, wherein the transmission axes of the first prism layer and the second prism layer are perpendicular.
11. A backlight module according to any one of claims 1-8, wherein the center of the ink in the ink application region is located where the intensity of light between two adjacent light sources is greatest.
12. A backlight module according to any one of claims 1-8, wherein the concentration of the ink is greater than or equal to 8% and less than or equal to 20%.
13. The backlight module according to any one of claims 1 to 8, wherein the surface of the side reflection sheet away from the side plate is coated with a fluorescent material.
14. A backlight module according to claim 13, further comprising a diffuser plate disposed opposite to the bottom reflector plate, wherein the diffuser plate is disposed on a side of the bottom reflector plate away from the bottom plate, a distance between the diffuser plate and the bottom reflector plate is greater than 5 mm, and a distance between the light sources is greater than 10 mm;
and the concentration of the fluorescent material is gradually reduced along the direction from the bottom reflecting sheet to the diffusion sheet on the surface of the side reflecting sheet far away from the side plate.
15. A display device, characterized in that the display device comprises the backlight module of any one of claims 1 to 14.
CN202111115136.3A 2021-09-23 2021-09-23 Backlight module and display device Active CN113791507B (en)

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