CN111694087B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN111694087B CN111694087B CN202010684770.8A CN202010684770A CN111694087B CN 111694087 B CN111694087 B CN 111694087B CN 202010684770 A CN202010684770 A CN 202010684770A CN 111694087 B CN111694087 B CN 111694087B
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- light
- backlight module
- film
- light guide
- guide plate
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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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
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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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
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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
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
Abstract
The invention discloses a backlight module and a display device. The backlight module comprises a light guide plate, wherein the light guide plate is provided with a light emitting surface, a bottom surface and a light incident surface, the light emitting surface and the bottom surface are oppositely arranged, the light incident surface is connected with the light emitting surface and the bottom surface, the bottom surface is provided with a microstructure, and the microstructure is at least two light guide blocks formed by extending outwards from the bottom surface; the light source and the light incident surface are oppositely arranged; and the optical film and the light-emitting surface are oppositely arranged. The technical scheme of the invention can improve the light-emitting effect of the backlight module, ensure the use efficiency of light rays and effectively control the light-emitting angle.
Description
Technical Field
The present invention relates to a display device, and more particularly, to a backlight module and a display device using the same.
Background
The backlight module generally includes a light source, a light guide plate and an optical film, wherein light emitted from the light source is guided to the optical film through the light guide plate. However, the light guide plate of the backlight module in the related art has poor light condensing performance, so that the intensity of light transmitted to the optical film through the light guide plate is weak, and the light emitting effect of the backlight module is reduced. Meanwhile, partial light is easy to leak from the side surface of the light guide plate of the backlight module in the related art, the leaked partial light can form a light package after being diffused and emitted by the backlight module, and the formation of the light package can not only reduce the use efficiency of the light, but also cause that the backlight module cannot effectively control the light emitting angle.
Disclosure of Invention
The present invention provides a backlight module, which aims to improve the light-emitting effect of the backlight module, ensure the utilization efficiency of light and effectively control the light-emitting angle.
The invention provides a backlight module, comprising:
the light guide plate is provided with a light emitting surface, a bottom surface and a light incident surface, wherein the light emitting surface and the bottom surface are oppositely arranged, the light incident surface is connected with the light emitting surface and the bottom surface, the bottom surface is provided with a microstructure, and the microstructure is at least two light guide blocks formed by extending outwards from the bottom surface;
the light source and the light incident surface are oppositely arranged; and
the optical film is arranged opposite to the light emergent surface.
In an embodiment of the present invention, a cross section of the light guide block is triangular, the light guide block includes a first extending edge and a second extending edge connected to the bottom surface, an included angle α between the first extending edge and the bottom surface is defined, and the α is disposed at an acute angle.
In an embodiment of the present invention, α is greater than or equal to 1 ° and less than or equal to 10 °.
In an embodiment of the invention, at least two of the light guide blocks are continuously disposed or spaced apart on the bottom surface along a direction in which the light source faces the light guide plate.
In an embodiment of the invention, the backlight module further includes a reflective sheet, and the reflective sheet and the bottom surface are oppositely disposed.
In an embodiment of the invention, the reflective sheet is made of silver.
In an embodiment of the invention, the backlight module further includes a prism sheet disposed between the reflective sheet and the bottom surface.
In an embodiment of the invention, a reflective film is disposed on a portion of the bottom surface close to the light incident surface;
or the light guide plate further comprises a side face which is opposite to the light incident face and connected with the light emergent face and the bottom face, the side face is provided with a reflecting film, and the reflecting film is arranged to cover the side face and extend to be turned over and cover part of the bottom face.
In an embodiment of the invention, the reflective film is a low-reflection film or a low-haze film.
In an embodiment of the present invention, the reflective film is a low reflective coating or a low haze film coating.
In an embodiment of the invention, the optical film is designed according to the transmittance of the matched glass in a dark state viewing angle, so that the optical film reduces the dark state light emission of the matched glass to form high contrast.
In an embodiment of the invention, the optical film includes an inverse prism film.
In an embodiment of the invention, a sawtooth structure is formed on the surface of the prism film facing the light guide plate, the sawtooth structure is matched with the microstructure and used for increasing light reflection, and the sawtooth structure is configured to modulate incident light and emergent light of the inverse prism film to form a 90-degree included angle.
In an embodiment of the present invention, the optical film further includes a diffusion film and a polarizer, and the diffusion film and the polarizer are sequentially distributed along a direction of the light guide plate facing the prism film.
In an embodiment of the present invention, the light source is a quantum dot LED;
or the light source is a combination of quantum powder and LED crystal grains.
In an embodiment of the invention, a quantum dot film is disposed between the light source and the light incident surface.
The invention also provides a display device, which comprises a backlight module, wherein the backlight module comprises:
the light guide plate is provided with a light emitting surface, a bottom surface and a light incident surface, wherein the light emitting surface and the bottom surface are oppositely arranged, the light incident surface is connected with the light emitting surface and the bottom surface, the bottom surface is provided with a microstructure, and the microstructure is at least two light guide blocks formed by extending outwards from the bottom surface;
the light source and the light incident surface are oppositely arranged; and
the optical film is arranged opposite to the light emergent surface.
When the backlight module is used, light emitted by the light source can enter the light guide plate through the light inlet surface of the light guide plate, and then can be totally reflected in the light guide plate and emitted from the light outlet surface of the light guide plate to be transmitted to the optical film, so that the process of converting a point light source or a linear light source into a surface light source is completed. Because the bottom surface of the light guide plate of the backlight module is provided with the microstructure, the exit angle of the light emitted from the light exit surface of the light guide plate can be reduced through the microstructure, so that the light emitted from the light exit surface of the light guide plate is gathered and transmitted to the optical membrane to enhance the intensity of the light, and the light emitting effect of the backlight module is improved. Moreover, the transmission path of the light emitted by the light source can be changed through the microstructure, so that the light entering the light guide plate can be normally emitted from the light emitting surface of the light guide plate, and the possibility of leakage and emission from the side surface of the light guide plate is reduced. So make backlight unit in this scheme can not appear the light package, and then guaranteed the availability factor of light, also realized carrying out effectual control to backlight unit's light-emitting angle.
Furthermore, the microstructures of the light guide plate are at least two light guide blocks formed by extending outwards from the bottom surface of the light guide plate, so that the microstructures are exposed on the outer surface of the light guide plate, the complexity of forming the microstructures is reduced, the light guide plate is convenient to manufacture and form, and the manufacturing efficiency of the backlight module can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic view of an overall structure of a backlight module according to an embodiment of the present invention;
fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a backlight module.
Referring to fig. 1, in an embodiment of the present invention, the backlight module includes a light guide plate 10, a light source 30 and a light source 30 film; the light guide plate 10 has a light emitting surface 11 and a bottom surface 13 which are oppositely arranged, and a light incident surface 15 connecting the light emitting surface 11 and the bottom surface 13, the bottom surface 13 is provided with a microstructure 17, and the microstructure 17 is at least two light guide blocks 171 formed by extending outwards from the bottom surface 13; the light source 30 and the light incident surface 15 are oppositely arranged; the optical film 50 and the light emitting surface 11 are disposed opposite to each other.
In an embodiment of the invention, the light guide plate 10 can be used to guide the light emitted from the light source 30, so that the light is converted from a point light source or a line light source into the surface light source 30 to ensure the light emitting effect of the backlight module. In order to increase the amount of light that can be incident into the light guide plate 10 by the light source 30, the light guide plate 10 may be wedge-shaped, that is, the thickness of the light guide plate 10 gradually decreases from the side close to the light incident surface 15 to the side far from the light incident surface 15. Of course, the present disclosure is not limited thereto, and in other embodiments, the light guide plate 10 may also be a flat plate, that is, the thickness of the light guide plate 10 is a fixed value in each area, so that each area of the light guide plate 10 has a certain thickness and the light guide plate 10 has a strong strength. The projection of the light guide plate 10 on the horizontal plane may be square or rectangular, which is not limited in this application. The micro-structure 17 formed by the light guide block 171 can be used for reflecting the light rays entering the light guide plate 10, reducing the incident angle of the light rays reflected to the light emitting surface 11, and correspondingly reducing the emergent angle of the light rays emitted from the light emitting surface 11, i.e. the light rays are gathered and transmitted to the optical film 50 to improve the light emitting effect of the backlight module. The light guide block 171 may be a long and integral body and extend along the extending direction of the two opposite sides of the light guide plate 10 not provided with the light incident surface 15; of course, the light guide block 171 may be a multi-segment structure, and a plurality of segments may be provided at intervals along the extending direction of the opposite sides of the light guide plate 10 where the light incident surface 15 is not provided. The light guide block 171 and the light guide plate 10 may be formed as a single body to improve the connection strength between the two. The light source 30 is mainly used for emitting light to the light guide plate 10, so that the backlight module can emit light. The light source 30 may be a linear light source 30 that is elongated along the extending direction of the two opposite sides of the light guide plate 10 that are not provided with the light incident surface 15, and of course, the light source 30 may also be a plurality of point light sources 30 that are arranged at intervals along the extending direction of the two opposite sides of the light guide plate 10 that are not provided with the light incident surface 15, and the application does not limit the type of the light source 30, and it is sufficient to emit light into the light guide plate 10. The optical film 50 is mainly used to enhance or diffuse the light emitted from the light guide plate 10, so as to further improve the light-emitting effect of the backlight module.
When the backlight module according to the technical scheme of the invention is used, light emitted by the light source 30 can enter the light guide plate 10 through the light incident surface 15 of the light guide plate 10, and then can be totally reflected in the light guide plate 10 and emitted from the light emitting surface 11 of the light guide plate 10 to be transmitted to the optical film 50, thereby completing the process of converting a point light source or a linear light source into a surface light source. Because the bottom surface 13 of the light guide plate 10 of the backlight module in this embodiment is provided with the microstructure 17, the exit angle of the light emitted from the light exit surface 11 of the light guide plate 10 can be reduced by the microstructure 17, so that the light emitted from the light exit surface 11 of the light guide plate 10 is transmitted to the optical film 50 more closely to enhance the intensity of the light, thereby improving the light emitting effect of the backlight module. In addition, the transmission path of the light emitted by the light source 30 can be changed by the microstructures 17, so that the light entering the light guide plate 10 can be emitted from the light emitting surface 11 of the light guide plate 10 normally, and the possibility of the light leaking from the side surface of the light guide plate 10 is reduced. So make backlight unit in this scheme can not appear the light package, and then guaranteed the availability factor of light, also realized carrying out effectual control to backlight unit's light-emitting angle. In addition, in an embodiment of the invention, the optical film 50 may be designed according to the transmittance of the matched glass dark state viewing angle, so that the optical film 50 reduces the matched glass dark state light to form a high contrast ratio. That is to say, the optical film 50 is adaptively disposed according to the height of the transmittance of the glass substrate of the lcd to the light, so as to ensure that most of the light emitted from the light source 30 can greatly pass through the glass substrate of the lcd, so as to further control the light-emitting angle of the backlight module, thereby achieving the effect of high contrast due to the high height of the bright state and the low brightness of the dark state.
Furthermore, the microstructures 17 of the light guide plate 10 are at least two light guide blocks 171 extending outward from the bottom surface 13 of the light guide plate 10, so that the microstructures 17 are exposed on the outer surface of the light guide plate 10, the complexity of forming the microstructures 17 is reduced, the light guide plate 10 is convenient to manufacture and form, and the manufacturing efficiency of the backlight module can be improved.
Referring to fig. 1 and fig. 2, in an embodiment of the invention, the cross section of the light guide block 171 is triangular, the light guide block 171 includes a first extending edge 1711 and a second extending edge 1713 connected to the bottom surface 13, an included angle α between the first extending edge 1711 and the bottom surface 13 is defined, and the α is disposed at an acute angle.
It can be understood that the included angle α between the first extending edge 1711 and the bottom surface 13 is an acute angle, so that the light in the light guide plate 10 can be reflected to the second extending edge 1713 when being reflected to the first extending edge 1711. And the light is reflected to the light-emitting surface 11 by the second extension, so that the incident angle of the light reflected to the light-emitting surface 11 is smaller, and the gathering effect of the light is further realized. The light guide block 171 may have a triangular cross section, so that the light guide block 171 has a regular shape, thereby facilitating the molding of the microstructure 17. Of course, the present application is not limited thereto, and in other embodiments, the cross section of the light guide block 171 may also be a semicircular shape. In one embodiment of the present invention, α is 1 ° or more and 10 ° or less. Specifically, α may be 1 °, 2 °, 3 °, 4 °, 5 °, 6 °, 7 °, 8 °, 9 °, and 10 °, or may be any value in the above interval, and preferably, α may be set to 1 °.
Referring to fig. 1, in an embodiment of the invention, at least two light guide blocks 171 are disposed on the bottom surface 13 continuously or at intervals along a direction of the light source 30 facing the light guide plate 10.
It can be understood that at least two light guide blocks 171 are continuously disposed, so as to increase the distribution area of the micro-structures 17 on the bottom surface 13 of the light guide plate 10, so that the light guide blocks can reflect and gather light rays reflected to each area on the bottom surface 13, thereby improving the light guide effect of the micro-structures 17. The at least two light guide blocks 171 are spaced apart from each other, so that less material is required for forming and manufacturing the microstructure 17, and the manufacturing cost of the microstructure 17 can be reduced.
In an embodiment of the present invention, the backlight module further includes a reflective sheet 70, and the reflective sheet 70 and the bottom surface 13 are disposed oppositely.
It is understood that the light transmitted from the bottom surface 13 of the light guide plate 10 may be reflected by the reflective sheet 70 so that the portion of the light may enter the light guide plate 10 again and be transmitted to the optical film 50 through the light guide plate 10, thereby improving the utilization efficiency of the light.
In an embodiment of the present invention, the reflective sheet 70 is made of silver.
It can be understood that the reflective sheet 70 made of silver material can improve the light reflection of the reflective sheet 70 due to the high reflectivity of the silver material. Of course, the present application is not limited thereto, and in other embodiments, the material of the reflective sheet 70 may be aluminum, copper, white PET (polyethylene terephthalate), or the like.
In an embodiment of the invention, the backlight module further includes a prism sheet 5580, and the prism sheet 5580 is disposed between the reflective sheet 70 and the bottom surface 13.
It can be understood that, since the prism sheet 5580 can condense the diffused light within a certain angle, that is, can condense the light emitted from the reflective sheet 70, the intensity of the reflected light is increased, and the intensity of the reflected light re-incident into the light guide plate 10 is increased, so that the light emitting effect of the backlight module can be increased again.
In an embodiment of the present invention, a portion of the bottom surface 13 close to the light incident surface 15 is provided with a reflective film 19;
or, the light guide plate 10 further includes a side surface 16 facing the light incident surface 15 and connecting the light emitting surface 11 and the bottom surface 13, the side surface 16 is provided with a reflective film 19, and the reflective film 19 is disposed to cover the side surface 16 and extend, fold, and cover a portion of the bottom surface 13.
It is understood that the reflective film 19 is disposed to reflect the light transmitted from the periphery of the light guide plate 10, so that the light can be re-introduced into the light guide plate 10 to be re-used. Therefore, the light-emitting intensity of the periphery of the light guide plate 10, that is, the light-emitting intensity of the periphery of the backlight module, can be enhanced, and the light-emitting brightness of the middle part and the periphery of the backlight module is balanced, so that the uniformity of the light-emitting brightness of the backlight module is improved. In an embodiment of the present invention, the reflective film 19 may be a low reflective film 19 sheet or a low haze film sheet, that is, the reflective film 19 and the light guide plate 10 are separate structures, so that the two can be separately manufactured. Of course, the application is not limited thereto, and in other embodiments, the reflective film 19 may also be a low-reflection coating or a low-haze film coating, that is, the reflective film 19 and the light guide plate 10 are an integral structure, so that the two are connected more firmly.
In one embodiment of the present invention, the optical film 50 includes an inverse prism film 51.
It can be understood that the light emitted from the light-emitting surface 11 of the light guide plate 10 can be gathered by the inverse prism film 51 to enhance the brightness of the light, thereby improving the light-emitting effect of the backlight module. Further, the surface of the prism film facing the light guide plate 10 is formed with a saw-tooth structure 511, and the saw-tooth structure 511 and the microstructure 17 cooperate to increase light reflection. Meanwhile, the sawtooth structure 511 can also be set to modulate the incident light and the emergent light of the inverse prism film 51 to form an included angle of 90 degrees, so that the light emitted by the backlight module can be vertically incident into the liquid crystal panel of the display device.
In an embodiment of the present invention, the optical film 50 further includes a diffusion film 53 and a polarizer, and the diffusion film 53 and the polarizer are sequentially distributed along a direction of the light guide plate 10 facing the prism film.
It can be understood that the light emitted from the light-emitting surface 11 of the light guide plate 10 can be diffused by the diffusion film 53, so as to widen the viewing angle, thereby increasing the light-emitting range of the backlight module. The polaroid can separate the incident light with polarized light component to make one part of the light pass through and the other part of the light hide through absorption, reflection, scattering and other actions, so that the light can be subjected to color separation and pressure reduction to control the image display effect and improve the contrast.
In one embodiment of the present invention, the light source 30 is a quantum dot LED.
It can be understood that the light source 30 employs a quantum dot LED, that is, a quantum dot light emitting diode, so that the light source 30 has the advantages of wide color gamut coverage, high light emitting purity, and the like, thereby improving the light emitting effect of the light source 30. Of course, the present application is not limited thereto, and in other implementations, the light source 30 may also be a combination of quantum powder and LED dies, that is, the quantum powder is encapsulated in the LED dies to improve the saturation of the color of the light emitted by the light source 30; or a quantum dot film is directly disposed between the light source 30 and the light incident surface 15, so that light emitted from the light source 30 is mixed by the quantum dot film, thereby increasing the color gamut of the light and making the color more vivid.
The present invention further provides a display device, which includes a backlight module, and the specific structure of the backlight module refers to the above embodiments, and since the display device adopts all the technical solutions of all the above embodiments, the display device at least has all the beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein.
The display device can be a liquid crystal television, a notebook, a tablet or a mobile phone.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (11)
1. A backlight module, comprising:
the light guide plate is provided with a light emitting surface, a bottom surface and a light incident surface, wherein the light emitting surface and the bottom surface are oppositely arranged, the light incident surface is connected with the light emitting surface and the bottom surface, the bottom surface is provided with a microstructure, and the microstructure is at least two light guide blocks formed by extending outwards from the bottom surface; the part of the bottom surface, which is close to the light incident surface, is also provided with a reflecting film; or the light guide plate further comprises a side face which is opposite to the light incident face and is connected with the light emergent face and the bottom face, the side face is provided with a reflecting film, and the reflecting film is arranged to cover the side face and extend, fold and cover part of the bottom face;
the light source and the light incident surface are oppositely arranged; a quantum dot film is arranged between the light source and the light incident surface; and
the optical film and the light emergent surface are oppositely arranged; the optical film comprises an inverse prism film, a sawtooth structure is formed on the surface of the inverse prism film facing the light guide plate, the sawtooth structure is matched with the microstructure and used for increasing light reflection, and the sawtooth structure is arranged to modulate incident light and emergent light of the inverse prism film to form a 90-degree included angle;
the backlight module further comprises a reflector plate, the reflector plate and the bottom surface are oppositely arranged, the backlight module further comprises a prism sheet, and the prism sheet is arranged between the reflector plate and the bottom surface.
2. The backlight module as claimed in claim 1, wherein the light guide block has a triangular cross section, and the light guide block includes a first extending edge and a second extending edge connected to the bottom surface, and an included angle α is defined between the first extending edge and the bottom surface, and the α is disposed at an acute angle.
3. The backlight module as claimed in claim 2, wherein α is 1 ° or more and 10 ° or less.
4. The backlight module according to claim 1, wherein at least two of the light guide blocks are disposed on the bottom surface continuously or at intervals along a direction of the light source facing the light guide plate.
5. The backlight module as claimed in claim 1, wherein the reflective sheet is made of silver.
6. The backlight module of claim 1, wherein the reflective film is a low reflection film or a low haze film.
7. The backlight module of claim 1, wherein the reflective film is a low reflection coating or a low haze film coating.
8. The backlight module according to any of claims 1-4, wherein the optical film is designed according to the transmittance of the matched glass in the dark state viewing angle, so that the optical film reduces the light emitted from the matched glass in the dark state to form a high contrast ratio.
9. The backlight module according to claim 1, wherein the optical film further comprises a diffusion film and a polarizer, and the diffusion film and the polarizer are sequentially disposed along a direction of the light guide plate facing the prism film.
10. The backlight module according to any one of claims 1 to 4, wherein the light source is a quantum dot LED;
or the light source is a combination of quantum powder and LED crystal grains.
11. A display device comprising the backlight module according to any one of claims 1 to 10.
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| CN202010684770.8A CN111694087B (en) | 2020-07-15 | 2020-07-15 | Backlight module and display device |
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| CN202010684770.8A CN111694087B (en) | 2020-07-15 | 2020-07-15 | Backlight module and display device |
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| CN111694087A CN111694087A (en) | 2020-09-22 |
| CN111694087B true CN111694087B (en) | 2021-08-24 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301692A (en) * | 2015-12-04 | 2016-02-03 | 苏州茂立光电科技有限公司 | Light guide plate with high light utilization rate, and design method thereof |
| CN105650490A (en) * | 2016-03-09 | 2016-06-08 | 苏州向隆塑胶有限公司 | Lighting lamp and design method for light guide plate of lighting lamp |
| CN110333626A (en) * | 2019-06-17 | 2019-10-15 | 武汉华星光电技术有限公司 | Backlight module and display device |
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