CN113534537A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN113534537A CN113534537A CN202110856045.9A CN202110856045A CN113534537A CN 113534537 A CN113534537 A CN 113534537A CN 202110856045 A CN202110856045 A CN 202110856045A CN 113534537 A CN113534537 A CN 113534537A
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
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Abstract
The embodiment of the application provides a backlight module and a display device, wherein the backlight module comprises a light source array and a diffusion plate, and the light source array comprises a plurality of light-emitting units which are arranged in an array; the diffusion plate comprises a diffusion plate body and a light guide part, and the diffusion plate body is arranged on the light emitting side of the light source array; the light guide parts are arranged on the side surface of the diffusion plate body close to the light source array and are arranged in a one-to-one correspondence with the light emitting units; the light guide part is of a total reflection structure, and the light emitted by the light emitting unit enters the corresponding light guide part to realize total reflection. By the design, light emitted by the light emitting units can be constrained in the light guide part for transmission, the irradiation area of the light emitting units is accurately controlled, and each light emitting unit is provided with the respective independent light emitting area, so that the light mixing problem among the light emitting units is improved, the control of the image edge brightness is realized, and the contrast of the image edge area is improved. The image edge definition in Local Dimming (Local Dimming) can be improved in the display effect.
Description
Technical Field
The embodiment of the application relates to the technical field of display devices, in particular to a backlight module and a display device.
Background
A Liquid Crystal Display (LCD) includes a Liquid Crystal Display panel and a backlight module, and since the Liquid Crystal Display panel does not emit light, a light source provided by the backlight module is required to realize normal Display.
The backlight module can be divided into a direct type backlight module and a side type backlight module according to the position of the light source. In some direct type backlight modules, the backlight module comprises a light source array formed by arranging a plurality of light emitting units in an array, and the light emitting units arranged in the array form a surface light source corresponding to a display area through light mixing.
However, the light emitted by each light emitting unit and the light emitted by the adjacent light emitting units are mutually staggered, and a light mixing area with a certain distance exists, so that the boundary crossing of a bright area and a dark area occurs when Local Dimming (Local Dimming) is realized, and the control of the brightness of the edge of the image is not facilitated.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a backlight module and a display device.
In a first aspect, an embodiment of the present application provides a backlight module, including a light source array and a diffuser plate, where the light source array includes a plurality of light emitting units arranged in an array; the diffusion plate comprises a diffusion plate body and a light guide part, and the diffusion plate body is arranged on the light emitting side of the light source array;
the light guide parts are arranged on the side face, close to the light source array, of the diffusion plate body, and a plurality of light emitting units are arranged in one-to-one correspondence with the light guide parts; the light guide part is of a total reflection structure, and light rays emitted by the light emitting units enter the corresponding light guide part to realize total reflection.
In the backlight unit that this application embodiment provided, what lead the light guide part is total reflection structure, can retrain the light that the luminescence unit sent and transmit in the light guide part, the light that the luminescence unit sent realizes accurate light-emitting through leading the light guide part, realize accurate control to the illumination area of luminescence unit, thereby realize that every luminescence unit all has independent light emitting area separately, with the mixed light problem between the improvement luminescence unit, realize the control of image edge luminance, improve the contrast in image edge region. The image edge definition in Local Dimming (Local Dimming) can be improved in the display effect.
In a possible implementation manner, the light guide part is a circular truncated cone structure with a first axis as a central axis, the first axis is coincident with a light-emitting central line corresponding to the light-emitting unit, and a light-emitting direction of the light source array is parallel to the light-emitting central line;
the light guide part is gradually increased from the first axis along the light emitting direction.
In a possible implementation manner, an end surface of the light guide portion close to the light source array is a first light incident surface, and the light guide portion satisfies:
tan(θ/2)＝L/d；
wherein L is the diameter of the first light incident surface; theta is the light emitting angle of the light emitting unit, d is the distance between the light emitting unit and the first light incident surface along the light emergent direction.
In a possible embodiment, the light guide part is a regular quadrangular frustum with a first axis as a central axis, the first axis is coincident with a light-emitting central line corresponding to the light-emitting unit, and the light-emitting direction of the light source array is parallel to the light-emitting central line;
the light guide part is gradually increased from the first axis along the light emitting direction.
In a possible implementation manner, an end surface of the light guide portion close to the light source array is a first light incident surface, and the light guide portion satisfies:
tan(θ/2)＝L/d；
wherein L is the side length of the first light incident surface; theta is the light emitting angle of the light emitting unit, d is the distance between the light emitting unit and the first light incident surface along the light emergent direction.
In one possible embodiment, the light guide portion satisfies:
sin(α-θ/2)＝n2/n1；
wherein n is1Is a refractive index of the light guide portion, n2The refractive index of the peripheral area of the light guide part; α is an included angle of the outer peripheral side wall of the light guide portion relative to the first light emitting surface; theta isThe light emitting angle of the light emitting unit.
In one possible embodiment, a space is formed between adjacent light guide portions.
In one possible embodiment, the light emitting unit has a light emitting angle of 120 degrees, the light guide portion has a refractive index of 1.5, and the cavity structure has a refractive index of 1.
In a possible embodiment, the spacer cavities are filled with a transparent material having a refractive index lower than the refractive index of the light guide portion.
In a possible embodiment, along the light emitting direction, the light guide part has a length not greater than that of the diffusion plate body.
In one possible embodiment, the light-emitting unit is a light-emitting diode, a sub-millimeter light-emitting diode, or a micrometer light-emitting diode.
In a possible embodiment, the light emitting units in the light source array are arranged in a plurality of rows and columns along a first direction and a second direction perpendicular to each other, and the light emitting direction of the light source array is perpendicular to the first direction and the second direction.
In a possible embodiment, the backlight module further includes a back plate, the back plate includes a middle plate and a side plate standing on one side of the middle plate, the side plate and the middle plate define an installation space, and the light source array and the diffusion plate are installed in the installation space.
In a possible embodiment, the light emitting units in the light source array are arrayed in a plane parallel to the middle plate, and the diffusion plate is disposed on a side of the light source array away from the middle plate;
the backlight module also comprises an optical film layer and a rubber frame, wherein the optical film layer is arranged on one side of the diffusion plate, which is far away from the middle plate; the rubber frame is connected with the back plate, the diffusion plate and the optical film layer.
In one possible embodiment, the light guide part is an optical fiber including an incident end near the light emitting unit and an exit end near the diffusion plate.
In a second aspect, an embodiment of the present application provides a display device, which includes a liquid crystal display panel and the backlight module of any one of the embodiments of the first aspect, wherein the liquid crystal display panel is disposed on a light-emitting side of the backlight module.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or related technologies of the present application, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, it is obvious that the drawings in the following description are only one or more embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of the backlight module shown in FIG. 1;
fig. 3 is a schematic light-emitting diagram of a Mini LED light source according to an embodiment of the present disclosure;
FIG. 4 is a schematic view of the diffuser plate shown in FIG. 2;
FIG. 5 is a schematic structural diagram of the area A in FIG. 2;
FIG. 6 is a cross-sectional view of the diffuser plate and the light source array of FIG. 4 taken along the direction B-B;
FIG. 7 is a cross-sectional view of the diffuser plate of FIG. 4 taken along the direction C-C;
FIG. 8 is a schematic diagram of an exemplary optical path of the light emitting unit of FIG. 2;
FIG. 9 is a schematic structural diagram of another embodiment of the diffuser plate shown in FIG. 2.
Description of reference numerals:
the backlight module comprises a 1-backlight module, a 2-liquid crystal display panel, a 3-back panel, a 31-middle panel, a 32-side panel, a 4-light source array, a 41-mounting substrate, a 42-light-emitting unit, a 5-optical film layer, a 6-diffusion plate, a 61-diffusion plate body, a 7-rubber frame, an 8-interval cavity, a 9-light guide part and a 10-first light incident surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure, and as shown in fig. 1, the display device is a liquid crystal display device, and includes a liquid crystal display panel 2 and a backlight module 1, where the liquid crystal display panel 2 includes an Array substrate (Array), a Color Filter substrate (CF for short), and a liquid crystal layer, and the liquid crystal layer is disposed between the Array substrate and the Color Filter substrate after a Cell is aligned, and is used to control light passing through the liquid crystal display panel 2. The liquid crystal display panel 2 does not emit light, and the backlight module 1 is required to provide light for the liquid crystal display panel 2.
According to the position of the light source, the backlight module 1 can be divided into a direct type backlight module and a side type backlight module, the direct type backlight module is selected for the backlight module 1 in the embodiment of the application, and the liquid crystal display panel 2 is arranged on the light emitting side of the backlight module 1.
Fig. 2 is a schematic structural diagram of the backlight module in fig. 1, please refer to fig. 1 and fig. 2, the backlight module 1 includes a back plate 3, a light source array 4, a diffusion plate 6, an optical film 5, and a plastic frame 7.
The back plate 3 includes a middle plate 31 and a side plate 32 vertically standing on one side of the middle plate 31, the middle plate 31 is a plate-shaped structure, the side plate 32 extends along a direction perpendicular to the middle plate 31 and extends along a peripheral edge of the middle plate 31, a closed surrounding structure is formed on the middle plate 31, a space defined by the side plate 32 and the middle plate 31 is defined as an installation space, the light source array 4, the diffusion plate 6, the optical film 5 and the rubber frame 7 are disposed in the installation space, and the liquid crystal display panel 2 is also disposed in the installation space.
Herein, a plane in which the middle plate 31 is located is defined to be parallel to a first direction and a second direction perpendicular to each other, and a direction perpendicular to the middle plate 31 and toward a side in which the side plate 32 is located is defined as a third direction. Taking the embodiment shown in fig. 1 to 9 as an example, the first direction is parallel to the X coordinate axis, the second direction is parallel to the Y coordinate axis, and the third direction is parallel to the Z coordinate axis.
The light source array 4 includes a mounting substrate 41 and a plurality of light emitting units 42 disposed on the mounting substrate 41, wherein the mounting substrate 41 has a plate-shaped structure, and may be a Flexible Printed Circuit (abbreviated as FPC) or a rigid Printed Circuit Board (abbreviated as PCB) on which a Circuit for controlling the operation of the light emitting units 42 is disposed. The mount substrate 41 is disposed on the side of the intermediate plate 31 near the side plate 32 in a posture parallel to the intermediate plate 31, and the mount substrate 41 in the mounted state is parallel to the first direction and the second direction.
All the light emitting cells 42 are arranged on the mounting substrate 41 in an array, in this embodiment, a plurality of light emitting cells 42 are arranged in a row along a first direction, and a plurality of rows are arranged along a second direction, and the light emitting cells 42 in the same order of different rows are aligned in the second direction to form a plurality of rows. That is, all the light emitting cells 42 are arranged in an array of rows and columns along the first direction and the second direction. Herein, the interval between adjacent columns of the light emitting cells 42 is defined as a column interval, which is also the interval between adjacent light emitting cells 42 in the same row; the spacing between adjacent rows of light-emitting cells 42 is defined as the row spacing, which is also the spacing between adjacent light-emitting cells 42 in the same column.
The light emitting unit 42 may be a light-emitting diode (abbreviated as LED), a submillimeter LED (Mini LED), or a Micro LED (Micro LED). In this embodiment, the light emitting unit 42 is a Mini LED, which is an LED device with a chip size between 50 μm and 200 μm and has a smaller size compared with a common LED, so when the Mini LED is applied to the backlight module 1, the Mini LED is beneficial to the backlight module 1 to achieve Local Dimming (Local Dimming) more finely and to achieve high dynamic contrast, so that the backlight module 1 has the advantages of better light transmission uniformity, higher contrast, more bright and dark details, and the like.
In addition, more precise local dimming and High dynamic contrast are beneficial to realizing High Dynamic Range (HDR) display, so that the display device obtains better display effect.
The number, density, and adjacent pitch of the Mini LEDs may be determined according to the display brightness of the display device, the size of the liquid crystal display panel 2, the light transmittance of the liquid crystal display panel 2, the performance of the Mini LEDs, and other factors.
Fig. 3 is a schematic view of a light emitting of a Mini LED light source according to an embodiment of the present disclosure, as shown in fig. 3, the Mini LED is a point light source, and light rays are emitted from a self-light emitting center toward different directions to form a spherical light emitting region. The light-emitting intensity right above the light-emitting region is highest, a straight line where the highest position of the light-emitting intensity in the light-emitting region and the light-emitting center point are located is defined as a light-emitting center line, and a plane which is perpendicular to the light-emitting center line and passes through the light-emitting center point is defined as a light-emitting plane.
The luminous intensity gradually decreases as the angle with respect to the luminous centerline increases. The Mini LED light emitting angle is also called as a power angle, and a half power angle is usually used, that is, the light emitting angle at which the Mini LED light emitting intensity is not lower than 50% of the maximum light emitting intensity defines the light emitting angle of the Mini LED. In some application scenarios, the lighting angle of the Mini LED may also be defined by using 60%, 80% or 90% lighting intensity, which is not described herein.
In this embodiment, the included angle between the edge of the light emitting region corresponding to the 50% light intensity and the light emitting center line is 60 degrees, and the light emitting angle θ of the Mini LED is 120 degrees.
When mounted, the light emission center line is perpendicular to the intermediate plate 31, the light emission plane is parallel to the intermediate plate 31, the light emission center line is parallel to the third direction, and the light emission plane is perpendicular to the third direction. The light emitting direction of the light source array 4 is a direction perpendicular to the light emitting plane and away from the light emitting plane.
FIG. 4 is a schematic view of the diffuser plate shown in FIG. 2; FIG. 5 is a schematic structural diagram of the area A in FIG. 2; FIG. 6 is a cross-sectional view of the diffuser plate and the light source array of FIG. 4 taken along the direction B-B; FIG. 7 is a cross-sectional view of the diffuser plate of FIG. 4 taken along the direction C-C; please refer to fig. 4 to fig. 7.
The diffusion plate 6 is disposed on one side of the light emitting direction of the light source array 4, and includes a diffusion plate body 61 and a light guide portion 9, the diffusion plate body 61 is a plate-shaped structure, the plate-shaped structure includes a second light incident surface and a second light emitting surface, which are opposite to each other, the second light incident surface and the second light emitting surface are both planes perpendicular to the light emitting direction, the second light incident surface is disposed close to the light source array 4 relative to the second light emitting surface, that is, the direction from the second light incident surface to the first light emitting surface is the same as the light emitting direction.
The diffusion plate 6 is provided with light guide portions 9 arranged in an array on the second light incident surface, the light guide portions 9 and the light emitting units 42 are arranged in a one-to-one correspondence manner, and the arrangement manner is the same as that of the light emitting units 42 in the light source array 4. Referring to fig. 3, the light guide portions 9 are arranged in a row along the first direction, and a pitch between adjacent light guide portions 9 in the same row is equal to a column pitch of the light source array 4. The light guide portions 9 in a plurality of rows are arranged along the second direction, the light guide portions 9 in the same positions of different rows are aligned along the second direction to form a plurality of rows of light guide portions 9, and the distance between adjacent rows in the plurality of rows of light guide portions 9 is equal to the row distance of the light source array 4.
In this embodiment, the light guide portion 9 is a circular truncated cone structure with a first axis as a central axis, and the first axis coincides with a light-emitting central line of the corresponding light-emitting unit 42. Two ends of the light guide portion 9 opposite to the first axis are two circular end surfaces, which are the first light incident surface 10 near the light emitting unit 42 and the first light emitting surface near the diffusion plate body 61. The first light emitting surface is overlapped with the second light incident surface of the diffusion plate body 61, and can be in contact with the first light emitting surface of the adjacent light guide portion 9.
The cross section of the light guide part 9 perpendicular to the first axis is circular, and the diameter of the cross section of the light guide part 9 gradually increases in the process of departing from the light emitting body from the first light incident surface 10 along the first axis. The spacing cavities 8 are limited between the adjacent light guide parts 9.
The light guide portion 9 is a light guide structure, and is configured to enable light rays emitted by the corresponding light emitting unit 42 to enter from the first light incident surface 10 and then to be totally reflected in the light guide portion 9. Total Internal Reflection (TIR) is an optical phenomenon in which when light is emitted from an optically dense medium to an optically sparse medium, the refracted light disappears completely when the incident angle exceeds a certain critical angle, and only the reflected light remains, called total reflection.
In the embodiment of the present application, the light guide portion 9 surrounds the peripheral sidewall of the first axis, i.e. the interface between the optically dense medium and the optically sparse medium, the optically dense medium is inside the light guide portion 9, and the peripheral region of the light guide portion 9 is the optically sparse medium.
In order to allow total reflection of the light entering the light guide 9, it is necessary to satisfy:
sin(α-θ/2)＝n2/n1；
wherein, please refer to FIG. 5, n1Refractive index of the light guide part 9, n2Refractive index of the peripheral region of the light guide part 9; α is an angle between the outer peripheral sidewall of the light guide portion 9 and the first light incident surface 10; θ is a light emitting angle of the light emitting unit 42.
Taking the light emitting angle θ as 120 degrees, the refractive index of the light guide portion 9 as 1.5, the spacing grooves in the peripheral region of the light guide portion 9 as a cavity structure, and the refractive index as 1 as an example, the included angle α between the peripheral sidewall of the light guide portion 9 and the first light incident surface 10 is calculated to be 101.8 °. That is, when the outer peripheral sidewall of the light guide part 9 forms an angle α of 101.8 ° with respect to the first light incident surface 10, the light emitted from the light emitting unit 42 enters the light guide part 9 from the first light incident surface 10 and is totally reflected.
In a possible embodiment, the spacer cavity 8 is filled with a light-transmissive material, which has a refractive index smaller than that of the light-guiding part 9 in order to allow the light-guiding part 9 to achieve total reflection.
In order to enable all the light rays within the light emitting angle θ of the Mini LED to enter the light guide portion 9 and improve the light emitting efficiency, the light guide portion 9 needs to satisfy:
tan(θ/2)＝L/d；
referring to fig. 6, L is a diameter of the first light incident surface 10; θ is the light emitting angle of the light emitting unit 42, and d is the distance from the light emitting unit 42 to the first light incident surface 10 along the light emitting direction, i.e. the distance between the light emitting plane of the light emitting unit 42 and the first light incident surface 10.
Fig. 8 is a schematic view of a typical light path of the light emitting unit in fig. 2, as shown in fig. 8, a light ray emitted from the light emitting unit 42 enters the light guiding portion 9 from the first light incident surface 10 of the light guiding portion 9, and is totally reflected in the light guiding portion 9 to control the traveling direction of the light ray, and the light guiding portion 9 restrains the light ray in the light guiding portion 9 for transmission, and then enters the diffusion plate body 61 from the first light emergent surface.
As can be seen from the above description, with the diffusion plate 6 provided in the embodiment of the present application, by using the light guiding function of the light guiding portion 9, the light emitted by each light emitting unit 42 can be constrained in the light guiding portion 9 for transmission, the light emitted by each light emitting unit 42 realizes accurate light emitting through the light guiding portion 9, and the illumination area of the light emitting unit 42 is accurately controlled, so that each light emitting unit 42 has an independent light emitting area, thereby improving the light mixing problem between the light emitting units 42, realizing image edge brightness control, and improving the contrast of the image edge area. The image edge definition in Local Dimming (Local Dimming) can be improved in the display effect.
The light guide unit 9 and the diffusion plate body 61 may be integrated or separated. Referring to fig. 5, in the light emitting direction, the length of the light guide part 9 is H1, and the length of the diffusion plate body 61 is H2, in a possible embodiment, H1 should not be greater than H2, so as to ensure the strength requirement of the diffusion plate 6.
The optical film layer 5 is disposed on a side of the diffusion plate body 61 away from the light guide portion 9 for improving light output of the diffusion plate 6, and is usually disposed in multiple layers. The glue frame 7 is disposed in an area between the side edges of the light source array 4, the diffusion plate 6, and the optical film 5 and the middle side plate 32 of the back plate 3, and is used for connecting and fixing the light source array 4, the diffusion plate 6, the optical film 5 and the back plate 3, and when being assembled with the liquid crystal display panel 2, the glue frame 7 is also used for connecting with the liquid crystal display panel 2.
The backlight module 1 may also include a reflector and a prism set, where the reflector is disposed corresponding to the light source array 4 and used for reflecting the light emitted by the light emitting unit 42, so as to improve the utilization rate of the light source. The prism group is arranged on one side of the optical film layer 5 far away from the diffusion plate 6 and used for improving light emission.
The embodiment of the present application provides another backlight module, which is different from the above embodiments in the structure of the diffusion plate, fig. 9 is a schematic structural view of another implementation of the diffusion plate in fig. 2, as shown in fig. 9, the light guide portion 9 has a square frustum with a first axis as a central axis, and a cross section of the square frustum perpendicular to the first axis is a square. The length of the light guide part 9 from the first axis gradually increases in the light outgoing direction.
The end face of the light guide part 9 close to the light source array is a first light incident face, the first light incident face is square, and the light guide part 9 satisfies the following conditions:
tan(θ/2)＝L/d；
wherein L is the side length of the first light incident surface 10; theta is the light emitting angle of the light emitting unit, and d is the distance between the light emitting unit and the first light incident surface along the light emitting direction.
For other matters, reference may be made to the description of the above embodiments, which are not repeated herein.
The embodiment of the application further provides another backlight module, in the embodiment, the light guide part is an optical fiber, the optical fiber comprises an incident end close to the light emitting unit and an emergent end close to the diffusion plate, and light emitted by the light emitting unit enters the optical fiber through the incident end and is transmitted to the diffusion plate. The optical fiber is a total reflection structure, and the same technical effect as the light guide portion in the above embodiment can still be achieved by using the optical fiber.
In the description of the embodiments of the present application, 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 those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the present application. 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 embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless explicitly stated or limited otherwise; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features mentioned in the different embodiments of the present application can be combined with each other as long as they do not conflict with each other.
So far, the technical solutions of the present application have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present application is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the present application, and the technical scheme after the changes or substitutions will fall into the protection scope of the present application.
Claims (16)
1. The backlight module is characterized by comprising a light source array and a diffusion plate, wherein the light source array comprises a plurality of light emitting units which are arranged in an array; the diffusion plate comprises a diffusion plate body and a light guide part, and the diffusion plate body is arranged on the light emitting side of the light source array;
the light guide parts are arranged on the side face, close to the light source array, of the diffusion plate body, and a plurality of light emitting units are arranged in one-to-one correspondence with the light guide parts; the light guide part is of a total reflection structure, and light rays emitted by the light emitting units enter the corresponding light guide part to realize total reflection.
2. The backlight module according to claim 1, wherein the light guide portion is a truncated cone structure having a first axis as a central axis, the first axis is coincident with a light emitting central line corresponding to the light emitting unit, and a light emitting direction of the light source array is parallel to the light emitting central line;
the light guide part is gradually increased from the first axis along the light emitting direction.
3. The backlight module according to claim 2, wherein the end surface of the light guide portion close to the light source array is a first light incident surface, and the light guide portion satisfies:
tan(θ/2)＝L/d；
wherein L is the diameter of the first light incident surface; theta is the light emitting angle of the light emitting unit, d is the distance between the light emitting unit and the first light incident surface along the light emergent direction.
4. The backlight module as claimed in claim 1, wherein the light guide portion is a regular quadrangular frustum with a first axis as a central axis, the first axis is coincident with a light emitting central line corresponding to the light emitting unit, and a light emitting direction of the light source array is parallel to the light emitting central line;
the light guide part is gradually increased from the first axis along the light emitting direction.
5. The backlight module according to claim 4, wherein the end surface of the light guide portion close to the light source array is a first light incident surface, and the light guide portion satisfies:
tan(θ/2)＝L/d；
wherein L is the side length of the first light incident surface; theta is the light emitting angle of the light emitting unit, d is the distance between the light emitting unit and the first light incident surface along the light emergent direction.
6. The backlight module according to any one of claims 2-5, wherein the light guide part satisfies:
sin(α-θ/2)＝n2/n1；
wherein n is1Is a refractive index of the light guide portion, n2The refractive index of the peripheral area of the light guide part; α is an included angle of the outer peripheral side wall of the light guide portion relative to the first light emitting surface; and theta is the light-emitting angle of the light-emitting unit.
7. The backlight module as claimed in claim 6, wherein a space is formed between adjacent light guide portions.
8. The backlight module as claimed in claim 7, wherein the light emitting angle of the light emitting unit is 120 degrees, the refractive index of the light guide portion is 1.5, and the refractive index of the cavity structure is 1.
9. A backlight module according to claim 6, wherein the spacing cavities are filled with a transparent material having a refractive index smaller than the refractive index of the light guide portion.
10. The backlight module according to any one of claims 2-5, wherein the light guide part has a length no greater than that of the diffusion plate body along the light emergent direction.
11. The backlight module as claimed in claim 1, wherein the light emitting units are LEDs, sub-millimeter LEDs or micrometer LEDs.
12. The backlight module according to claim 1, wherein the light emitting units in the light source array are arranged in a plurality of rows and columns along a first direction and a second direction perpendicular to each other, and a light emitting direction of the light source array is perpendicular to the first direction and the second direction.
13. The backlight module according to claim 1, wherein the backlight module further comprises a back plate, the back plate comprises a middle plate and a side plate standing on one side of the middle plate, the side plate and the middle plate define a mounting space, and the light source array and the diffusion plate are mounted in the mounting space.
14. A backlight module according to claim 13, wherein the light emitting units in the light source array are arranged in an array in a plane parallel to the middle plate, and the diffuser plate is disposed on a side of the light source array away from the middle plate;
the backlight module also comprises an optical film layer and a rubber frame, wherein the optical film layer is arranged on one side of the diffusion plate, which is far away from the middle plate; the rubber frame is connected with the back plate, the diffusion plate and the optical film layer.
15. The backlight module as claimed in claim 1, wherein the light guide part is an optical fiber including an incident end near the light emitting unit and an exit end near the diffusion plate.
16. A display device, comprising a liquid crystal display panel and the backlight module of any one of claims 1-15, wherein the liquid crystal display panel is disposed on the light-emitting side of the backlight module.
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