CN114217479B - Optical assembly, backlight module and display device - Google Patents
Optical assembly, backlight module and display device Download PDFInfo
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- CN114217479B CN114217479B CN202210122990.0A CN202210122990A CN114217479B CN 114217479 B CN114217479 B CN 114217479B CN 202210122990 A CN202210122990 A CN 202210122990A CN 114217479 B CN114217479 B CN 114217479B
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- light source
- light guide
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- 230000003287 optical effect Effects 0.000 title claims abstract description 86
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 238000009792 diffusion process Methods 0.000 claims description 16
- 239000000243 solution Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 239000012788 optical film Substances 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 210000005056 cell body Anatomy 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 210000002421 cell wall Anatomy 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000010147 laser engraving Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000009537 plain noodles Nutrition 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- 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
-
- 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
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses an optical assembly, a backlight module and a display device. The optical component comprises a light guide plate, at least one first light source and at least one second light source; at least one avoidance hole penetrating to the top is formed in the bottom of the light guide plate; the first light sources are arranged at the bottom of the light guide plate, and each first light source is arranged opposite to one avoidance hole; the second light source is arranged on the side edge of the light guide plate, and the light emitting surface of the second light source is arranged on the side edge of the light guide plate. The technical scheme of the invention can solve the problems of low overall brightness of the side-entry display device and uneven overall picture of the direct-type display device.
Description
Technical Field
The present invention relates to the field of liquid crystal display technology, and in particular, to an optical assembly, a backlight module, and a display device.
Background
Currently, liquid crystal display devices are mainly classified into a side-in type and a direct type according to the position of a light source. The light source of the side-in display device is arranged at the side edge, and the light emitted by the light source is guided into the optical film by using the light guide plate, so that the whole picture of the display device is uniform, but the light source is limited by the number of the light sources and the heat dissipation of a system, and the whole brightness of the side-in display device is difficult to improve; the light source array of the direct type display device is arranged at the bottom of the liquid crystal glass, so that the overall brightness of the direct type display device can be improved, but the brightness of the corresponding position of the light source is inconsistent with the brightness of the corresponding position of the non-light source, so that the overall picture of the direct type display device is uneven.
Disclosure of Invention
The invention provides an optical assembly, which aims to solve the problems of low overall brightness of a side-entry display device and uneven overall pictures of a direct-type display device.
To achieve the above object, the present invention provides an optical module, comprising:
the bottom of the light guide plate is provided with at least one avoidance hole penetrating to the top;
The first light sources are arranged at the bottom of the light guide plate, and each first light source is arranged opposite to one avoidance hole; and
The second light source is arranged on the side edge of the light guide plate, and the light emitting surface of the second light source is arranged towards the side edge of the light guide plate.
In one embodiment of the present invention, a light distribution structure is formed in the light guide plate.
In an embodiment of the invention, a plurality of the light distribution structures are provided, and a plurality of the light distribution structures are arranged at intervals.
In an embodiment of the invention, the cross-sectional area of the escape hole is larger than the cross-sectional area of the first light source.
In an embodiment of the invention, at least one light splitting structure is disposed on top of the light guiding plate, and each of the first light sources is disposed opposite to one of the light splitting structures.
In an embodiment of the invention, a bottom of the light splitting structure is provided with a groove body, each groove body is opposite to one of the avoidance holes, and a cross-sectional area of the groove body is smaller than a cross-sectional area of the avoidance hole and larger than a cross-sectional area of the first light source.
In an embodiment of the invention, a top of the light splitting structure has an arc area concavely arranged towards the direction of the first light source, and the arc area is used for reflecting the light emitted by the first light source.
In an embodiment of the invention, a top of the light splitting structure has an arc area protruding towards a direction away from the first light source, for refracting the light emitted by the first light source.
The invention also provides a backlight module, which comprises:
A back plate;
The middle frame is arranged around the backboard and is enclosed with the backboard to form a mounting groove;
the optical assembly is arranged in the mounting groove, and the light emergent side of the optical assembly is arranged towards the notch of the mounting groove; and
The diffusion plate is arranged in the mounting groove and is positioned at one side of the optical component, which is away from the bottom of the mounting groove;
Wherein the optical assembly comprises:
the bottom of the light guide plate is provided with at least one avoidance hole penetrating to the top;
The first light sources are arranged at the bottom of the light guide plate, and each first light source is arranged opposite to one avoidance hole; and
The second light source is arranged on the side edge of the light guide plate, and the light emitting surface of the second light source is arranged towards the side edge of the light guide plate.
In an embodiment of the invention, at least one light splitting structure is disposed on top of the light guide plate, and each of the first light sources is disposed opposite to one of the light splitting structures; defining a distance L between a light guide plate of the optical assembly and the diffusion plate;
when L is less than or equal to 25mm, the top of the light splitting structure is provided with an arc-shaped area concavely arranged towards the direction of the first light source and used for reflecting light rays emitted by the first light source;
When L is more than 25mm, the top of the light splitting structure is provided with an arc-shaped area protruding towards the direction far away from the first light source and used for refracting light rays emitted by the first light source.
The invention also provides a display device which comprises a display panel and the backlight module, wherein the display panel is arranged on one side of the diffusion plate, which is opposite to the optical component.
The optical component is provided with at least one first light source and at least one second light source at the bottom and the side edges of the light guide plate respectively; the bottom of the light guide plate is provided with a corresponding number of first light sources without being limited by space, so that the overall brightness of the optical assembly is ensured, and the overall brightness of the display device is further ensured; meanwhile, the light emitted by the second light source can enter the light guide plate through the side edge of the light guide plate, the light is incident into the light guide plate and is diffused towards all angles, and then is emitted from the top of the light guide plate, so that the light emitting uniformity of the optical assembly can be effectively ensured, and the uniformity of the whole picture of the display device is further effectively ensured. Therefore, the technical scheme of the invention solves the problems of low overall brightness of the side-entry display device and uneven overall picture of the direct-type display device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an exploded view of one embodiment of an optical assembly of the present invention;
FIG. 2 is an exploded view of one embodiment of an optical assembly of the present invention;
FIG. 3 is an exploded view of a portion of another embodiment of an optical assembly according to the present invention;
FIG. 4 is a schematic diagram of a light guide plate according to an embodiment of the present invention;
FIG. 5 is a schematic view of a light guide plate according to an embodiment of the present invention;
FIG. 6 is an exploded view of an embodiment of a backlight module according to the present invention;
FIG. 7 is a cross-sectional view of a backlight module according to an embodiment of the invention;
fig. 8 is an exploded view of an embodiment of a display device according to the present invention.
Reference numerals illustrate:
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the case where a directional instruction is involved in the embodiment of the present invention, the directional instruction is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional instruction is changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The present invention provides an optical assembly 10, which aims to solve the problems of low overall brightness of a side-entry display device 1000 and uneven overall screen of a direct-type display device 1000.
The specific structure of the optical assembly 10 of the present invention will be described below:
Referring to fig. 1 to 3 in combination, in an embodiment of the optical assembly 10 of the present invention, the optical assembly 10 includes a light guide plate 11, at least one first light source 13 and at least one second light source 14; at least one avoidance hole 112 penetrating to the top is formed in the bottom of the light guide plate 11; the first light sources 13 are arranged at the bottom of the light guide plate 11, and each first light source 13 is arranged opposite to one avoidance hole 112; the second light source 14 is disposed at a side edge of the light guide plate 11, and a light emitting surface of the second light source 14 is disposed toward the side edge of the light guide plate 11.
It can be understood that the optical assembly 10 of the present invention is provided with at least one first light source 13 and at least one second light source 14 at the bottom and side edges of the light guide plate 11, respectively; the corresponding number of the first light sources 13 can be arranged at the bottom of the light guide plate 11 without being limited by space, so that the overall brightness of the optical assembly 10 is ensured, and the overall brightness of the display device 1000 is further ensured; meanwhile, the light emitted by the second light source 14 can enter the light guide plate 11 through the side edge of the light guide plate 11, the light is incident into the light guide plate 11 and is diffused towards all angles, and then is emitted from the top of the light guide plate 11, so that the light emitting uniformity of the optical assembly 10 can be effectively ensured, and the uniformity of the whole picture of the display device 1000 can be effectively ensured. Therefore, the technical scheme of the invention solves the problems of low overall brightness of the side-entry display device 1000 and uneven overall picture of the direct-type display device 1000.
In addition, the light emitting surface of each first light source 13 is set towards one avoiding hole 112, so that most of the light rays emitted by each first light source 13 can pass through one avoiding hole 112 and the other light rays enter the light guide plate 11 through the wall of the avoiding hole 112, and the light energy of the first light source 13 can be fully utilized to reduce the light energy loss.
It should be noted that, by providing at least one first light source 13 and at least one second light source 14 at the bottom and the side edges of the light guide plate 11 to form the optical assembly 10, the optical assembly 10 of the present invention is equivalent to combining the original side-in optical structure with the original direct-type optical structure, so as to overcome the problems of low overall brightness of the side-in display device 1000 and uneven overall screen of the direct-type display device 1000.
Specifically, the light guide plate 11 is prepared by using an optical acrylic or polycarbonate plate, and then printing light guide points on the bottom surface of the optical plate by using a high-tech material with extremely high refractive index and no light absorption, and using laser engraving, V-shaped cross grid engraving and UV screen printing technologies.
The optical assembly 10 of the present invention further includes a first light source circuit board 15 and a second light source circuit board 16, wherein the first light source circuit board 15 is disposed at the bottom of the light guide plate 11 and electrically connected to the first light source 13, and the second light source circuit board 16 is disposed at a side of the second light source 14 opposite to the light guide plate 11 and electrically connected to the second light source 14.
The optical assembly 10 further includes a heat dissipation member 17, where the heat dissipation member 17 is partially disposed on a side of the second light source circuit board 16 facing away from the second light source 14 to dissipate heat from the second light source 14 and the second light source circuit board 16, and the heat dissipation member 17 is partially disposed on a side of the first light source circuit board 15 facing away from the light guide plate 11 to dissipate heat along with the first light source 13 and the first light source circuit board 15.
Further, referring to fig. 2 and 3 in combination, in one embodiment of the optical assembly 10 of the present invention, the cross-sectional area of the relief aperture 112 is larger than the cross-sectional area of the first light source 13; by this arrangement, it is ensured that as much light as possible of the light emitted from each first light source 13 can directly pass through one avoiding hole 112 to be emitted, so as to fully utilize the light energy of the first light source 13, thereby reducing the light energy loss.
Further, referring to fig. 4 in combination, in an embodiment of the optical assembly 10 of the present invention, a light distribution structure 111 is formed in the light guide plate 11; so set up, among the light that gets into light guide plate 11, there is some light to avoid grading structure 111 and direct light guide plate 11 of passing, and some light can take place reflection or refraction on grading structure 111 and light guide plate 11's critical face, and can take place multiple reflection or refraction back in light guide plate 11's inside, the top light-emitting of rethread light guide plate 11, in order to redistribute the light, thereby increase the light-emitting angle of light guide plate 11, with the light-emitting homogeneity that further promotes optical component 10, alright further promote the whole light-emitting homogeneity of display device 1000.
Specifically, the light guide plate 11 may form bubbles by a physical or chemical method in the injection molding process, so as to form the light distribution structure 111 inside the light guide plate 11, for example, the light distribution structure 111 may be formed inside the light guide plate 11 by a biaxial stretching process, and at this time, the light distribution structure 111 may be a cavity structure; of course, in other embodiments, the light distribution structure 111 may be an ink black dot or the like.
Further, referring to fig. 4 in combination, in an embodiment of the optical assembly 10 of the present invention, a plurality of light distribution structures 111 are provided, and a plurality of light distribution structures 111 are spaced apart; so set up, after light gets into light guide plate 11, alright make more light reflect or refract through the critical plane of grading structure 111 and light guide plate 11 to can improve the coefficient that light carries out reflection or refraction in light guide plate 11, thereby improve reflectivity and the refracting index of light, with the light-emitting angle of further increasing light guide plate 11.
Further, referring to fig. 4 in combination, in an embodiment of the optical assembly 10 of the present invention, the volume of the light distribution structure 111 accounts for 8% -10% of the volume of the light guide plate 11; since the volume of the light distribution structure 111 occupies too small volume of the light guide plate 11, it cannot be ensured that most of the light entering the light guide plate 11 can be secondarily split through the critical surface of the light distribution structure 111 and the light guide plate 11, so that the light emitting angle of the light guide plate 11 cannot be effectively increased; when the volume of the light distribution structure 111 occupies too large volume of the light guide plate 11, the self-supporting strength of the light guide plate 11 is insufficient, and deformation is easy to occur to influence the use effect; therefore, by setting the volume of the light distribution structure 111 to be 8% to 10% of the volume of the light guide plate 11, the above-described problem can be effectively avoided.
Further, referring to fig. 4 and 5 in combination, in an embodiment of the optical assembly 10 of the present invention, defining the width of the light distribution structure 111 in the thickness direction of the light guide plate 11 as M 1, the condition is satisfied: m 1 is less than or equal to 0.05mm and less than or equal to 0.15mm; since the width of the light distribution structure 111 in the thickness direction of the light guide plate 11 is too small, on the one hand, formation of the light distribution structure 111 is inconvenient, and on the other hand, it cannot be ensured that most of the light entering the light guide plate 11 can be secondarily split through the critical surface of the light distribution structure 111 and the light guide plate 11; when the width of the light distribution structure 111 in the thickness direction of the light guide plate 11 is too large, the light guide plate 11 is easy to deform or even break during transportation or use, so that the use effect is affected; therefore, by setting the width of the light distribution structure 111 in the thickness direction of the light guide plate 11 to be between 0.05mm and 0.15mm, the above-described problem can be effectively avoided.
Further, referring to fig. 4 in combination, in an embodiment of the optical assembly 10 of the present invention, defining the width of the light distribution structure 111 in the length direction of the light guide plate 11 as M 2, the condition is satisfied: m 2 is more than or equal to 0.1mm and less than or equal to 0.3mm; similarly, when the width of the light distribution structure 111 in the length direction of the light guide plate 11 is too small, on one hand, formation of the light distribution structure 111 is inconvenient, and on the other hand, it cannot be ensured that most of the light entering the light guide plate 11 can be secondarily split through the critical surface between the light distribution structure 111 and the light guide plate 11; when the width of the light distribution structure 111 in the length direction of the light guide plate 11 is too large, the light guide plate 11 is easy to deform or even break during transportation or use, so that the use effect is affected; therefore, by setting the width of the light distribution structure 111 in the longitudinal direction of the light guide plate 11 to be between 0.1mm and 0.3mm, the above-described problem can be effectively avoided.
Similarly, referring to fig. 5 in combination, in an embodiment of the optical assembly 10 of the present invention, defining the width of the light distribution structure 111 in the width direction of the light guide plate 11 as M 3, the condition is satisfied: m 3 is more than or equal to 0.1mm and less than or equal to 0.3mm; similarly, when the width of the light distribution structure 111 in the width direction of the light guide plate 11 is too small, on one hand, formation of the light distribution structure 111 is inconvenient, and on the other hand, it cannot be ensured that most of the light entering the light guide plate 11 can be secondarily split through the critical surface between the light distribution structure 111 and the light guide plate 11; when the width of the light distribution structure 111 in the width direction of the light guide plate 11 is too large, the light guide plate 11 is easy to deform or even break during transportation or use, so that the use effect is affected; therefore, by setting the width of the light distribution structure 111 in the width direction of the light guide plate 11 to be between 0.1mm and 0.3mm, the above-described problem can be effectively avoided.
Referring to fig. 4 and 5 in combination, in an embodiment of the optical assembly 10 of the present invention, defining the thickness of the light guide plate 11 as H, the condition is satisfied: h is more than or equal to 1mm and less than or equal to 3mm; since the thickness of the light guide plate 11 is too small, on one hand, the light emitted by the second light source 14 cannot sufficiently enter the light guide plate 11 from the side edge of the light guide plate 11, and on the other hand, the light entering the light guide plate 11 cannot be sufficiently diffused, so that the light emitting uniformity of the optical assembly 10 cannot be ensured; when the thickness of the light guide plate 11 is too large, the overall thickness of the optical assembly 10 is too large, so that the overall thickness of the display device 1000 is too large, which is not beneficial to miniaturization design; therefore, by setting the thickness of the light guide plate 11 between 1mm and 3mm, the above-mentioned problems can be effectively avoided.
Referring to fig. 2 and 3 in combination, in an embodiment of the optical assembly 10 of the present invention, at least one light splitting structure 12 is disposed on top of the light guiding plate 11, and each of the first light sources 13 is disposed opposite to one of the light splitting structures 12.
So set up, through being provided with the beam split structure 12 that sets up relatively with first light source 13 at the top of light guide plate 11, so, the light that first light source 13 sent can get into beam split structure 12, then reflect or refract the light that first light source 13 sent through beam split structure 12 to carry out the secondary beam split to the light through beam split structure 12, just enlarged the play light angle of optical subassembly 10, further guaranteed the play light homogeneity of optical subassembly 10, and then effectively promoted the display device 1000's display effect.
The light-splitting structure 12 is an optical lens capable of performing secondary light splitting on light, and the material may be one of light-transmitting materials such as polyethylene terephthalate and polymethyl methacrylate.
The light splitting structure 12 may be integrally formed on the top of the light guiding plate 11, and of course, an optical adhesive may be used to adhere to the top of the light guiding plate 11.
Further, referring to fig. 2 and 3 in combination, in an embodiment of the optical assembly 10 of the present invention, the bottom of the light splitting structure has a groove, each of the grooves is disposed opposite to one of the avoidance holes, and the cross-sectional area of the groove is smaller than the cross-sectional area of the avoidance hole and larger than the cross-sectional area of the first light source.
So set up, in the light that first light source 13 sent, just have most light to pass dodge hole 112 and penetrate into the cell body of beam splitting structure 12, the cell wall of light rethread cell body gets into beam splitting structure 12 in, just increased beam splitting structure 12's the area of income plain noodles for light takes place refraction or reflection in cell body cell wall department, then the beam splitting is carried out to rethread beam splitting structure 12, so, just enlarged beam-in angle of beam splitting structure 12, thereby enlarged beam-out angle of beam splitting structure 12, and then can further guarantee optical assembly 10's light-out homogeneity.
Further, referring to fig. 2 in combination, in an embodiment of the optical assembly 10 of the present invention, the top of the light splitting structure 12 has an arc-shaped area concavely arranged towards the direction of the first light source 13 for reflecting the light emitted by the first light source 13.
Compared with the planar arrangement, the area of the light splitting structure 12 is increased by arranging the arc-shaped area concavely arranged towards the direction of the first light source 13 at the top of the light splitting structure 12, and after the light rays emitted by the first light source 13 pass through the arc-shaped area at the top of the light splitting structure 12, the light rays emitted by the area can be reflected in the arc-shaped area, so that the angle of the light rays emitted by the area is increased, and the light emitting angle of the optical component 10 is further enlarged; in addition, when the optical assembly 10 of the present invention is applied to the backlight module 100, the light-emitting uniformity of the backlight module 100 is easily poor and the light-emitting uniformity of the display device 1000 is further poor due to the too small distance between the light guide plate 11 and the diffusion plate 40, so that the top of the light-splitting structure has an arc-shaped area concavely arranged towards the direction of the first light source 13, at this time, after the light emitted by the first light source 13 reaches the arc-shaped area, most of the light is reflected between the critical surface of the arc-shaped area and the outside to be reflected back to the bottom of the first light source 13, and then is emitted from the light guide plate 11 or other areas of the light-splitting structure 12 after being reflected by the reflective sheet 50 positioned at the bottom of the first light source 13, so that the light-emitting angle of the optical assembly 10 can be effectively enlarged, and the use quantity of the first light source 13 can be reduced while the overall brightness of the optical assembly 10 is ensured, and the manufacturing cost can be reduced.
Referring to fig. 3 in combination, in another embodiment of the optical assembly 10 of the present invention, the top of the light splitting structure has an arc-shaped area protruding away from the first light source for refracting the light emitted by the first light source.
In this way, compared with the planar arrangement, the area of the light splitting structure 12 is increased as well by arranging the top of the light splitting structure 12 with the arc-shaped area protruding towards the direction far away from the first light source 13, and after the light rays emitted by the first light source 13 pass through the arc-shaped area at the top of the light splitting structure 12, refraction can occur in the arc-shaped area, so that the angle of the light rays emitted by the area is increased, and the light emitting angle of the optical component 10 is further enlarged; in addition, the light emitted from the first light source 13 is concentrated with a strong front surface and scattered with a weak side surface, so that the light emitted from the optical assembly 10 is not uniform; based on this, the top of the light splitting structure 12 is provided with an arc area protruding towards the direction far away from the first light source 13, and the first light source 13 is opposite to the arc area, so that most of the light rays emitted by the first light source 13, which are strong in front and concentrated, are refracted at the arc area after reaching the arc area, so that the light rays diffuse to the side, the emergent angle of the light rays is enlarged, the emergent angle of the optical assembly 10 is effectively enlarged, and the conditions that the light rays are strong in front and concentrated, and weak in side and dispersed are relieved.
Illustratively, the surface on which the arcuate region is located may be a conical surface or a spherical surface, or the like.
Of course, in other embodiments, the top of the light splitting structure 12 may also have an uneven arc area, and similarly, compared with a planar arrangement, by making the top of the light splitting structure 12 have an uneven arc area, the area of the light splitting structure 12 is increased, and after the light emitted by the first light source 13 passes through the arc area of the top of the light splitting structure 12, reflection and refraction can occur in the arc area, so that the angle of the light emitted by the area is increased, and further the light emitting angle of the optical component 10 is further enlarged.
It should be noted that, the light splitting structure 12 has a light emitting surface 121, the light emitting surface 121 has a first light emitting area 1211 and a second light emitting area 1212 that are connected, the first light emitting area 1211 is disposed around the second light emitting area 1212 and is connected to the top of the light guiding plate 11, the second light emitting area 1212 is an arc-shaped area, and the first light emitting area 1211 and the second light emitting area 1212 are disposed towards the light emitting surface of the first light source 13, so as to receive and reflect or refract the light emitted by the first light source 13. The second light emitting region 1212 corresponds to an arc region concavely or convexly arranged at the top of the light splitting structure.
In addition, as shown in fig. 2, the first light-emitting area 1211 includes a flat area and an arc area, the flat area is disposed around the second light-emitting area 1212 and is connected with the second light-emitting area 1212, and the arc area is disposed around the flat area and is connected with the flat area and the top of the light guide plate 11, so that, among the light rays emitted by the first light source 13, the light rays reflected by the second light-emitting area 1212 can directly pass through the flat area and reach the reflective sheet 50 at the bottom of the first light source 13, so as to reduce the energy consumption of the light rays; the light reaching the arc area can be refracted to ensure the brightness of the side surfaces around the light splitting structure 12, and further effectively ensure the light emitting uniformity of the optical component 10.
Or as shown in fig. 3, the first light-emitting area 1211 includes a flat area and an arc area, the arc area is disposed around the second light-emitting area 1212 and is connected with the second light-emitting area 1212, and the flat area is disposed around the arc area and is connected with the arc area and the top of the light guide plate 11, so that, in the light emitted by the first light source 13, the light can pass through the flat area or the arc area of the first light-emitting area 1211 or the second light-emitting area 1212, so as to fully diffuse the light.
Further, referring to fig. 2 and 3 in combination, in an embodiment of the optical assembly 10 of the present invention, the front projection of the second light emitting area 1212 on a predetermined projection plane covers the front projection of the first light source 13 on the predetermined projection plane, where the bottom of the light guide plate 11 is located.
By making the front projection of the second light emitting area 1212 on the preset projection plane cover the front projection of the first light source 13 on the preset projection plane, most of the light emitted by the first light source 13 reaches the second light emitting area 1212, so as to effectively distribute the light through the second light emitting area 1212.
Referring to fig. 6 and fig. 7 in combination, the present invention further provides a backlight module 100, and the backlight module 100 includes a back plate 20, a middle frame 30, a diffusion plate 40, an optical film, and the optical assembly 10 as described above, wherein the specific structure of the optical assembly 10 is as described in the previous embodiments. Since the backlight module 100 adopts all the technical solutions of the foregoing embodiments, at least all the beneficial effects brought by all the technical solutions of all the foregoing embodiments are not described in detail herein. Wherein, the middle frame 30 is disposed around the back plate 20, and forms a mounting groove with the back plate 20; the optical assembly 10 is arranged in the mounting groove, and the light emergent side of the optical assembly 10 is arranged towards the notch of the mounting groove; the diffusion plate 40 is disposed in the installation groove and is located at a side of the optical assembly 10 facing away from the bottom of the installation groove.
In the present embodiment, during the assembly process, the optical assembly 10, the diffusion plate 40 and the optical film can be installed in the installation groove formed by the enclosure of the back plate 20 and the middle frame 30, and the light emitted from the optical assembly 10 can sequentially pass through the diffusion plate 40 and the optical film.
The backlight module 100 of the present invention further includes a reflective sheet 50, where the reflective sheet 50 is disposed at the bottom of the second light source 14, and a portion of the light reaching the light guide plate 11 may be reflected to the reflective sheet 50, and then secondarily reflected by the reflective sheet 50 to perform secondary light distribution on the portion of the light, and a portion of the light reaching the light splitting structure 12 may also be reflected to the reflective sheet 50, and then secondarily reflected by the reflective sheet 50 to perform secondary light distribution on the portion of the light. The backlight module 100 further includes an optical film disposed in the mounting groove and located on a side of the diffusion plate 40 facing away from the optical assembly 10.
Referring to fig. 7 in combination, in an embodiment of the backlight module 100 of the present invention, at least one light splitting structure 12 is disposed on top of the light guiding plate 11, and each of the first light sources 13 is disposed opposite to one of the light splitting structures 12; defining a distance L between the light guide plate 11 of the optical assembly 10 and the diffusion plate 40; when L is less than or equal to 25mm, the top of the light splitting structure 12 is provided with an arc-shaped area concavely arranged towards the direction of the first light source 13 and used for reflecting light rays emitted by the first light source 13; when L > 25mm, the top of the light splitting structure 12 has an arc-shaped area protruding towards the direction away from the first light source 13, for refracting the light emitted by the first light source 13.
When the distance between the light guide plate 11 of the optical assembly 10 and the diffusion plate 40 is less than or equal to 25mm, the light emitting uniformity of the backlight module 100 is easily poor, and the light emitting uniformity of the display device 1000 is further poor, so that most of light rays are reflected between critical surfaces of the optical structure and the outside to be reflected back to the bottom of the first light source 13, and then are reflected by the reflecting sheet 50 positioned at the bottom of the first light source 13 and then are emitted from other areas of the light guide plate 11 or the light splitting structure 12, so that the light emitting angle of the optical assembly 10 can be effectively enlarged; when the distance between the light guide plate 11 of the optical assembly 10 and the diffusion plate 40 is greater than 25mm, most of the light is refracted between the critical surfaces of the optical structure and the outside, so that the light is diffused to the side, the emergent angle of the light is enlarged, and the emergent angle of the optical assembly 10 is effectively enlarged.
Referring to fig. 8 in combination, the present invention further provides a display device 1000, where the display device 1000 includes a display panel 200 and the backlight module 100 as described above, and the specific structure of the backlight module 100 is described in detail in the foregoing embodiments. Since the display device 1000 adopts all the technical solutions of the foregoing embodiments, at least all the beneficial effects brought by all the technical solutions of all the foregoing embodiments are not described in detail herein. The display panel 200 is disposed on a side of the diffusion plate 40 facing away from the optical assembly 10.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (6)
1. A backlight module, comprising:
A back plate;
The middle frame is arranged around the backboard and is enclosed with the backboard to form a mounting groove;
The optical assembly is arranged in the mounting groove, and the light emergent side of the optical assembly is arranged towards the notch of the mounting groove; the optical assembly comprises a light guide plate, at least one first light source and at least one second light source, wherein at least one avoidance hole penetrating to the top is formed in the bottom of the light guide plate, the first light sources are arranged at the bottom of the light guide plate, each first light source is opposite to one avoidance hole, the second light source is arranged at the side edge of the light guide plate, and the light emitting surface of the second light source faces the side edge of the light guide plate; and
The diffusion plate is arranged in the mounting groove and is positioned at one side of the optical component, which is away from the bottom of the mounting groove;
The top of the light guide plate is provided with at least one light splitting structure, and each first light source and one light splitting structure are arranged oppositely; defining a distance L between a light guide plate of the optical assembly and the diffusion plate;
When L is less than or equal to 25mm, the top of the light splitting structure is provided with an arc-shaped area concavely arranged towards the direction of the first light source and used for reflecting light rays emitted by the first light source;
when L is more than 25mm, the top of the light splitting structure is provided with an arc-shaped area protruding towards the direction far away from the first light source and used for refracting light rays emitted by the first light source.
2. The backlight module according to claim 1, wherein a light distribution structure is formed in the light guide plate.
3. The backlight module according to claim 2, wherein a plurality of the light distribution structures are provided, and a plurality of the light distribution structures are arranged at intervals.
4. The backlight module of claim 1, wherein the dodging aperture has a cross-sectional area greater than a cross-sectional area of the first light source.
5. The backlight module according to claim 1, wherein the bottom of the light splitting structure is provided with a groove body, each groove body is opposite to one of the avoidance holes, and the cross-sectional area of the groove body is smaller than the cross-sectional area of the avoidance hole and larger than the cross-sectional area of the first light source.
6. A display device comprising a display panel and a backlight module according to any one of claims 1 to 5, wherein the display panel is disposed on a side of the diffusion plate facing away from the optical assembly.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210122990.0A CN114217479B (en) | 2022-02-09 | 2022-02-09 | Optical assembly, backlight module and display device |
| PCT/CN2023/075041 WO2023151599A1 (en) | 2022-02-09 | 2023-02-08 | Optical assembly, backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210122990.0A CN114217479B (en) | 2022-02-09 | 2022-02-09 | Optical assembly, backlight module and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114217479A CN114217479A (en) | 2022-03-22 |
| CN114217479B true CN114217479B (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210122990.0A Active CN114217479B (en) | 2022-02-09 | 2022-02-09 | Optical assembly, backlight module and display device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114217479B (en) |
| WO (1) | WO2023151599A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217479B (en) * | 2022-02-09 | 2024-05-07 | 深圳创维－Rgb电子有限公司 | Optical assembly, backlight module and display device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN114217479A (en) | 2022-03-22 |
| WO2023151599A1 (en) | 2023-08-17 |
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