CN118112843B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN118112843B CN118112843B CN202410511593.1A CN202410511593A CN118112843B CN 118112843 B CN118112843 B CN 118112843B CN 202410511593 A CN202410511593 A CN 202410511593A CN 118112843 B CN118112843 B CN 118112843B
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- 230000004308 accommodation Effects 0.000 claims description 9
- 238000013459 approach Methods 0.000 claims description 8
- 230000001154 acute effect Effects 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 16
- 238000010586 diagram Methods 0.000 description 24
- 230000000052 comparative effect Effects 0.000 description 14
- 239000000463 material Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000004984 smart glass Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
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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
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/009—Positioning aspects of the light source in the package
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The application discloses a backlight module and a display device, wherein the backlight module comprises a light guide plate and a plurality of light emitting components, each light emitting component comprises a light emitting unit and a light source bracket, the light source bracket comprises a first bracket and a second bracket, the first bracket comprises a first accommodating cavity, the second bracket comprises a second accommodating cavity, the first accommodating cavity is communicated with the second accommodating cavity, and the light emitting unit is arranged in the first accommodating cavity; the light guide plate is arranged on one side of the second support, far away from the first support, the orthographic projection of the light source support on the light guide plate is arranged in the light guide plate, the cross section area of the second accommodating cavity on one side close to the light guide plate is smaller than that of the second accommodating cavity on one side far away from the light guide plate, so that the light collecting effect of the light source support on light is improved, more light is injected into the light guide plate, the light emitting efficiency of the light emitting unit is improved, the light efficiency of the backlight module is improved, and the risk of light leakage is avoided.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a backlight module and a display device.
Background
Along with the increasing demands of consumers on the appearance of display devices such as Televisions (TVs), notebooks (notebooks), monitors (monitors), the light and thin design and narrow frame design of display devices are increasingly receiving attention from consumers; for example, a common display device may include a display panel and a backlight module, and the backlight module is configured to have thicker components, so that the appearance of the product is affected; therefore, it is continuously pursued to make the backlight thinner, so that the product tends to be thinner and lighter, and the competitiveness of the product is improved.
At present, in order to achieve the ultrathin backlight module, a plurality of modes are adopted, namely, the thickness of a light guide plate in the backlight module is reduced, but under the condition of reducing the thickness of the light guide plate, the risk that light leaks out of the surface of the light guide plate and is directed to a backboard is easy to occur, so that the problems of lamp shadow, light leakage and the like are generated.
Disclosure of Invention
The embodiment of the application provides a backlight module and a display device, which are used for relieving the defects in the related art.
In order to achieve the above functions, the technical solution provided by the embodiment of the present application is as follows:
The embodiment of the application provides a backlight module, which comprises a light guide plate and a plurality of light emitting components, wherein each light emitting component comprises:
A light emitting unit;
The light source bracket comprises a first bracket and a second bracket, wherein the first bracket comprises a plurality of first bracket inner walls, the second bracket comprises a plurality of second bracket inner walls, a plurality of first bracket inner walls enclose a first accommodating cavity, a plurality of second bracket inner walls enclose a second accommodating cavity, the first accommodating cavity is communicated with the second accommodating cavity, and the light emitting unit is arranged in the first accommodating cavity;
The light guide plate is positioned at one side of the second bracket far away from the first bracket, and the orthographic projection of the light source bracket on the light guide plate is positioned in the light guide plate;
The cross section area of the second accommodating cavity at one side close to the light guide plate is smaller than that of the second accommodating cavity at one side far away from the light guide plate.
Optionally, in an embodiment, the caliber of the first accommodating cavity gradually increases in a direction that the first accommodating cavity approaches the light guide plate, and the caliber of the second accommodating cavity gradually decreases in a direction that the second accommodating cavity approaches the light guide plate.
Optionally, in an embodiment, the first accommodating cavity has a first top surface close to the light guide plate, and the second accommodating cavity has a second top surface far from the light guide plate, and the first top surface and the second top surface are coincident.
Optionally, in an embodiment, the first receiving cavity and the second receiving cavity are symmetrically disposed about the first top surface or the second top surface.
Optionally, in an embodiment, the thickness of the light guide plate is greater than or equal to 0.8 mm and less than or equal to 1.5 mm.
Optionally, in an embodiment, the light guide plate is provided with a plurality of slots arranged at intervals, one slot is arranged corresponding to one light emitting component, and one slot and the corresponding light emitting component are embedded in the slot.
Optionally, in an embodiment, the slot has a slot bottom remote from the second bracket, the slot bottom having a first spacing from the second bracket;
Wherein the ratio of the length of the second bracket to the first spacing is greater than or equal to 1.9 and less than or equal to 16.
Optionally, in an embodiment, in a direction perpendicular to the light source holder, a depth of the second accommodating cavity is equal to a thickness of the second holder; wherein the thickness of the second bracket is more than or equal to 2.5 mm and less than or equal to 5 mm.
Optionally, in an embodiment, the second accommodating cavity includes a first opening disposed opposite to the second top surface, and the first opening is located at a side of the second accommodating cavity near the light guide plate;
The backlight module further comprises a filling part, wherein the filling part at least covers the first opening of the second accommodating cavity; wherein the refractive index of the filling part is larger than that of air.
Optionally, in an embodiment, an included angle between inner walls of two opposite second brackets of the second bracket along the first direction is greater than or equal to 30 degrees and less than or equal to 40 degrees.
Optionally, in an embodiment, the backlight module further includes a back plate, the back plate includes a bottom plate and a side plate, the side plate extends along a direction away from the bottom plate, the bottom plate and the side plate form an accommodating space, and the light guide plate and the light emitting assembly are both located in the accommodating space;
the light guide plate is arranged on the bottom plate, and the light source bracket is positioned on one side of the side plate, which is close to the light guide plate;
The second support is arranged on one side, close to the backboard, of the second support, the inner wall of the second support and the bottom plate form a preset angle, and the preset angle is an acute angle.
The embodiment of the application also provides a display device which comprises any one of the backlight modules.
The embodiment of the application has the beneficial effects that: the embodiment of the application provides a backlight module and a display device, wherein the backlight module comprises a light guide plate and a plurality of light emitting assemblies, each light emitting assembly comprises a light emitting unit and a light source bracket, the light source bracket comprises a first bracket and a second bracket, the first bracket comprises a first accommodating cavity, the second bracket comprises a second accommodating cavity, the first accommodating cavity is communicated with the second accommodating cavity, and the light emitting unit is arranged in the first accommodating cavity; through setting up the light guide plate is located the second support is kept away from one side of first support, the light source support is in orthographic projection on the light guide plate is located in the light guide plate, the second holds the chamber and is being close to the cross-sectional area of light guide plate one side is less than the second holds the chamber and is keeping away from the cross-sectional area of light guide plate one side to promote the gathering effect of light source support to light, make more light penetrate into the light guide plate, and then improve the light-emitting efficiency of lighting unit, improve backlight unit's light efficiency, avoid appearing the risk of light leak.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present application;
Fig. 2 is a schematic diagram of a first structure of a light emitting device according to an embodiment of the present application;
Fig. 3 is a schematic diagram of a second structure of a light emitting device according to an embodiment of the present application;
fig. 4 is a schematic light path diagram of a first structure of a light emitting device according to an embodiment of the present application;
fig. 5 is a schematic diagram of a third structure of a light emitting device according to an embodiment of the present application;
fig. 6 is a schematic diagram of a fourth structure of a light emitting device according to an embodiment of the present application;
fig. 7 is a schematic diagram of a fifth structure of a light emitting device according to an embodiment of the present application;
Fig. 8 is a schematic diagram of an assembly structure of a light guide plate and a light emitting assembly according to an embodiment of the present application
FIG. 9 is a schematic diagram of a conventional backlight module;
FIG. 10 is a schematic diagram of a conventional light emitting assembly;
FIG. 11a is a schematic diagram illustrating a light emitting effect of a first light guide plate according to an embodiment of the present application;
FIG. 11b is a schematic view illustrating a light emitting effect of a second light guide plate according to an embodiment of the present application;
Fig. 11c is a graph showing the brightness test values of the light guide plate of example 1 and the brightness test values of the light guide plate of comparative example 1 in table 1;
Fig. 12 is a schematic structural diagram of a display device according to an embodiment of the application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and description only, and is not intended to limit the application. In the present application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used generically to refer to the upper and lower aspects of the device in its actual use or mode of operation, and specifically the orientation of the drawing in the figures; while "inner" and "outer" are for the outline of the device.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only, and features defining "first," "second," and the like may explicitly or implicitly include one or more of the recited features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
The following disclosure provides many different embodiments for implementing different configurations of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
The embodiment of the application provides a backlight module and a display device. The following will describe in detail. The following description of the embodiments is not intended to limit the preferred embodiments.
Please combine fig. 1 and fig. 2; fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present application; fig. 2 is a schematic diagram of a first structure of a light emitting device according to an embodiment of the application.
The present embodiment provides a backlight module 1, where the backlight module 1 includes a Light guide plate 10 and a plurality of Light Emitting assemblies 20, each of the Light Emitting assemblies 20 includes a Light Emitting unit 201 and a Light source support 202, the Light source support 202 is used for supporting and fixing the Light Emitting unit 201, and the Light Emitting unit 201 may be a Light-Emitting Diode (LED), which is not limited in this embodiment.
Specifically, the backlight module 1 further includes a back plate 30 and a circuit board 40, the back plate 30 includes a bottom plate 301 and a side plate 302, the side plate 302 extends in a direction away from the bottom plate 301, the bottom plate 301 and the side plate 302 form an accommodating space 300, and the light guide plate 10, the light emitting assembly 20 and the circuit board 40 are all located in the accommodating space 300; the light guide plate 10 is disposed on the bottom plate 301, the light source bracket 202 is disposed on a side of the side plate 302 near the light guide plate 10, an orthographic projection of the light source bracket 202 on the light guide plate 10 is disposed in the light guide plate 10, the circuit board 40 is disposed on a side of the side plate 302 near the light guide plate 10, the light emitting assemblies 20 are disposed on the circuit board 40, and the circuit board 40 is provided with a circuit capable of controlling the light emitting assemblies 20.
The light source support 202 includes a first support 2021 and a second support 2022, the first support 2021 includes a plurality of first support inner walls 20211, the second support 2022 includes a plurality of second support inner walls 20221, a plurality of first support inner walls 20211 enclose a first accommodating cavity 100, a plurality of second support inner walls 20221 enclose a second accommodating cavity 200, and the first accommodating cavity 100 is communicated with the second accommodating cavity 200.
Specifically, a plurality of the first brackets 2021 are sequentially connected and surround the light emitting unit 201 to form the first accommodation chamber 100, and a plurality of the second brackets 2022 are sequentially connected and surround the light emitting unit 201 to form the second accommodation chamber 200; the first accommodating cavity 100 includes a first top surface 110 and a first supporting surface 120 that are oppositely disposed, the first top surface 110 is located at a side of the first accommodating cavity 100 near the second accommodating cavity 200, the first supporting surface 120 is respectively connected to the first inner bracket wall 20211 around the first supporting surface, the second accommodating cavity 200 includes a second top surface 210 and a first opening 220 that are oppositely disposed, the first opening 220 is respectively connected to the second inner bracket wall 20221 around the first opening, and the second top surface 210 is located at a side of the second accommodating cavity 200 near the first accommodating cavity 100; the light-emitting unit 201 is disposed in the first accommodating cavity 100, and when the light-emitting unit 201 emits light, the light can be emitted from the first accommodating cavity 100 to the second accommodating cavity 200, and emitted from the second accommodating cavity 200 to the light guide plate 10.
Further, the first supporting surface 120 is a plane, the first bracket inner wall 20211 and the second bracket inner wall 20221 are inclined surfaces, and the first top surface 110, the second top surface 210 and the first opening 220 are virtual planes; specifically, the first support inner wall 20211 extends obliquely from the edge of the first support surface 120 in a direction away from the light-emitting unit 201, and the first support inner wall 20211 forms an inclined surface between the first top surface 110 and the first support surface 120 so that the reflection angle of the light emitted from the light-emitting unit 201 is larger; the first bracket inner wall 20211 may also be an arc surface.
The light guide plate 10 is located at a side of the second support 2022 away from the first support 2021, and a cross-sectional area of the second accommodating cavity 200 at a side close to the light guide plate 10 is smaller than a cross-sectional area of the second accommodating cavity 200 at a side away from the light guide plate 10; specifically, the second support inner wall 20221 extends obliquely from the edge of the first opening 220 toward the direction approaching the light emitting unit 201, the second support inner wall 20221 forms an inclined plane between the second top surface 210 and the first opening 220, and the second support inner wall 20221 may also be an arc surface.
In the related art, a plurality of methods are adopted to achieve the ultra-thin backlight module, in which the thickness of the light guide plate in the backlight module is reduced, but the light guide plate with reduced thickness is configured with a light source, so that the risk that light leaks out of the surface of the light guide plate and is directed to the back plate is easy to occur, and thus the problems of light shadow, light leakage and the like are generated.
It can be appreciated that, in this embodiment, the cross-sectional area of the second accommodating cavity 200 on the side close to the light guide plate 10 is smaller than the cross-sectional area of the second accommodating cavity 200 on the side far away from the light guide plate 10, so as to improve the light collecting effect of the light source bracket 202 on the light, so that more light can be emitted into the light guide plate 10 from the light source bracket 202, thereby improving the light emitting efficiency of the light emitting unit 201, improving the light efficiency of the backlight module 1, and avoiding the risk of light leakage.
In an embodiment, the caliber of the first accommodating chamber 100 is gradually increased in a direction in which the first accommodating chamber 100 approaches the light guide plate 10, and the caliber of the second accommodating chamber 200 is gradually decreased in a direction in which the second accommodating chamber 200 approaches the light guide plate 10.
It can be understood that, in this embodiment, the aperture of the first accommodating cavity 100 is gradually increased by being disposed in the direction in which the first accommodating cavity 100 approaches the light guide plate 10, so that the opening area and the light emitting angle of the light emitting side of the first accommodating cavity 100 are increased, and more light can be emitted from the first top surface 110 of the first accommodating cavity 100; meanwhile, the aperture of the second accommodating cavity 200 gradually decreases in the direction that the second accommodating cavity 200 is close to the light guide plate 10, so that the light collecting effect of the second bracket 2022 on light is improved, more light can be injected into the light guide plate 10 from the first opening 220, the light emitting efficiency of the light emitting unit 201 is improved, the light efficiency of the backlight module 1 is improved, and the risk of light leakage is avoided.
In one embodiment, the first top surface 110 and the second top surface 210 are coincident; specifically, the area of the first top surface 110 is equal to and coincides with the area of the second top surface, the first accommodating cavity 100 and the second accommodating cavity 200 are symmetrically disposed with respect to the first top surface 110 or the second top surface 210, and the central axis W1 of the first support 2021, the central axis W2 of the second support 2022 and the central axis W3 of the light emitting unit 201 coincide with each other, so that the second support 2022 is prevented from shielding the light emitted from the first accommodating cavity 100, thereby affecting the light emitting efficiency of the light emitting unit 201, and further improving the light emitting uniformity of the light emitting unit 201.
Further, in an embodiment, the backlight module 1 further includes a color conversion layer (not labeled in the figure), the phosphor layer fills the first accommodating cavity 100, and the front projection of the phosphor layer on the first supporting surface 120 covers the light emitting unit 201; the wavelength of the light emitted by the light emitting unit 201 may be 400 nm to 480 nm, the light emitting unit 201 may emit blue light, a part of the blue light is effectively converted into green light and red light by the color conversion layer, and the converted green light and red light are mixed with the unconverted part to form white light for emitting; wherein the material of the color conversion layer comprises, but is not limited to, fluorescent powder.
It is understood that the symmetrical arrangement of the first receiving chamber 100 and the second receiving chamber 200 with respect to the first top surface 110 or the second top surface 210 is for illustration only.
For example, in another embodiment, please combine fig. 1 and 3; fig. 3 is a schematic diagram of a second structure of the light emitting device according to the embodiment of the present application.
In an embodiment, along the first direction X, an included angle α between two opposite second bracket inner walls 20221 of the second bracket 2022 is greater than or equal to 30 degrees and less than or equal to 40 degrees; in this embodiment, the technical means of the present application is illustrated by taking the first direction as the X direction as an example.
It may be appreciated that, in the present embodiment, the first accommodating cavity 100 and the second accommodating cavity 200 are asymmetrically disposed with respect to the first top surface 110 or the second top surface 210, where, along the first direction X, an included angle α between two opposite second support inner walls 20221 of the second support 2022 is greater than or equal to 30 degrees and less than or equal to 40 degrees, so that the light-gathering capability of the second support 2022 to emit light to the light-emitting unit 201 can be controlled by controlling the size of the included angle α between two opposite second support inner walls 20221 of the second support 2022, that is, the size of the included angle α between two opposite second support inner walls 20221 of the second support 2022 may be selected according to practical design requirements.
Further, please refer to fig. 1 and fig. 4; fig. 4 is a schematic light path diagram of a first structure of a light emitting device according to an embodiment of the present application.
In an embodiment, the backlight module 1 further includes a reflective layer 203, the reflective layer 203 is disposed on a side of the second bracket inner wall 20221 near the light-emitting unit 201, and the reflective layer 203 covers the second bracket inner wall 20221; specifically, the reflective surface of the reflective layer 203 is close to the light emitting unit 201, and the material of the reflective layer 203 is not particularly limited in this embodiment.
It can be appreciated that in this embodiment, the reflecting layer 203 is disposed on the side of the second support inner wall 20221 near the light emitting unit 201, and the reflecting layer 203 covers the second support inner wall 20221, when the light emitting unit 201 emits light, the light can be emitted from the first accommodating cavity 100 to the reflecting layer 203 in the second accommodating cavity 200, and the light is concentrated to the center line of the light source support 202 via the reflecting layer 203, so that the light source energy is prevented from being damaged, and the light leakage, the light shadow, and the like of the backlight module 1 are improved.
In an embodiment, the material of the second support 2022 includes, but is not limited to, a reflective material, and by setting the material of the second support 2022 to be a reflective material, the light emitted by the light emitting unit 201 can be reflected by the second support inner wall 20221 of the second support 2022, so that the reflective area is increased, the light utilization rate is improved, and the waste of light energy is avoided.
Specifically, when the light emitting unit 201 emits light, the light may be emitted from the first accommodating cavity 100 to the second inner wall 20221 of the second accommodating cavity 200, and the light is concentrated to the center line of the light source bracket 202 via the second inner wall 20221, so as to avoid damaging the light source energy, and improve the light leakage, the light shadow, and the like of the backlight module 1.
Please refer to fig. 1 and 5; fig. 5 is a schematic diagram of a third structure of a light emitting device according to an embodiment of the present application.
In one embodiment, the second accommodating cavity 200 includes a first opening 220 disposed opposite to the second top surface 210, and the first opening 220 is located at a side of the second accommodating cavity 200 near the light guide plate 10; the backlight module 1 further includes a filling portion 204, where the filling portion 204 at least covers the first opening 220 of the second accommodating cavity 200; wherein the refractive index of the filling portion 204 is larger than that of air.
In this embodiment, the thickness and the material of the filling portion are not particularly limited, as long as the filling portion at least covers the first opening of the second accommodating cavity.
Specifically, the light emitted by the light emitting unit 201 sequentially passes through the first accommodating cavity 100, the second accommodating cavity 200 and the filling portion 204, wherein the first accommodating cavity 100 is filled with the phosphor layer, and the filling portion 204 only covers the first opening 220 of the second accommodating cavity 200, that is, the light emitted by the light emitting unit 201 sequentially passes through the phosphor layer, the second accommodating cavity 200 and the filling portion 204.
It can be appreciated that the light emitting unit 201 may emit blue light, a part of the blue light is effectively converted into green light and red light by the phosphor layer, the converted green light and red light are mixed with the unconverted part to form white light and are injected into the second accommodating cavity 200, and then the white light is emitted out of the light source holder 202 through the filling part 204; since the refractive index of the filling portion 204 is greater than that of air, light is refracted when entering the filling portion 204 from the second accommodating chamber 200, and the refraction angle (light-emitting angle) is increased, even if the light emitted from the light-emitting unit 201 is emitted at a larger light-emitting angle, the light energy is emitted into the light guide plate 10 from a plurality of angles as much as possible, so that the light energy utilization rate of the light-emitting unit 201 and the light efficiency of the backlight module 1 can be improved.
Please refer to fig. 1 and 6; fig. 6 is a schematic diagram of a fourth structure of a light emitting device according to an embodiment of the present application.
In an embodiment, the backlight module 1 further includes a back plate 30, the back plate 30 includes a bottom plate 301 and a side plate 302, the side plate 302 extends in a direction away from the bottom plate 301, the bottom plate 301 and the side plate 302 form a receiving space 300, and the light guide plate 10 and the light emitting assembly 20 are both located in the receiving space 300; the light guide plate 10 is arranged on the bottom plate 301, and the light source bracket 202 is positioned on one side of the side plate 302 close to the light guide plate 10; wherein, at a side of the second support 2022 near the back plate 30, the inner wall 20221 of the second support forms a preset angle with the bottom plate 301, and the preset angle is an acute angle.
It should be noted that, at present, in the prior art, the ultrathin backlight module can be realized by adopting a mode of reducing the thickness of the back plate, but under the condition of reducing the thickness of the back plate, the flatness of the back plate is easy to be poor, so that the light guide plate is stressed unevenly and is deformed locally, for example, the flatness of the light guide plate is easy to be damaged due to local raising of the back plate, the light guide plate is warped or shifted, and then the light leakage and other problems are caused due to the risk that the lower surface of the light guide plate is shot to the back plate.
It can be appreciated that, in this embodiment, the second support 2022 is disposed on a side of the second support near the back plate 30, the inner wall 20221 of the second support and the bottom plate 301 are at a preset angle, and the preset angle is an acute angle, so that the light collecting effect of the light source support 202 on the light is improved, more light can be injected into the light guide plate 10 from the light source support 202, so that the light emitting efficiency of the light emitting unit 201 is improved, the light emitted by the light emitting unit 201 is prevented from being emitted from the lower surface of the light guide plate 10 to the back plate 30, and the light efficiency of the backlight module 1 is improved.
It should be understood that the second bracket 2022 is disposed on a side of the back plate 30, and the second bracket inner wall 20221 forms a predetermined angle with the bottom plate 301, and the predetermined angle is an acute angle for illustration only, which is not limited in this embodiment.
For example, in another embodiment, please refer to fig. 1 and 7; fig. 7 is a schematic diagram of a fifth structure of a light emitting device according to an embodiment of the application.
In one embodiment, on the side of the second support 2022 away from the back plate 30, the second support inner wall 20221 forms a predetermined angle with the bottom plate 301, and the predetermined angle is an acute angle.
It should be noted that, at present, in the prior art, the backlight module can be further ultrathin by adopting a mode of reducing the thickness of the back plate, but under the condition of reducing the thickness of the back plate, the flatness of the back plate is easy to be poor, so that the light guide plate is stressed unevenly and is deformed locally, for example, the flatness of the light guide plate is easy to be damaged due to local raising of the back plate, the light guide plate is warped or shifted, and then the light leakage and other problems are caused due to the risk that the upper surface of the light guide plate is shot to the back plate.
It can be appreciated that, in this embodiment, the second support 2022 is disposed on a side of the second support 2022 away from the back plate 30, the inner wall 20221 of the second support and the bottom plate 301 are at a preset angle, and the preset angle is an acute angle, so that the light collecting effect of the light source support 202 on the light is improved, more light can be injected into the light guide plate 10 from the light source support 202, so that the light emitting efficiency of the light emitting unit 201 is improved, the light emitted by the light emitting unit 201 is prevented from leaking from the upper surface of the light guide plate 10, and the light efficiency of the backlight module 1 is improved.
Please refer to fig. 1 and 8; fig. 8 is a schematic diagram of an assembly structure of a light guide plate and a light emitting assembly according to an embodiment of the present application;
In an embodiment, the light guide plate 10 includes a light incident surface 101, a light emergent surface 102, and a second bottom surface 103 opposite to the light emergent surface 102, the light incident surface 101 is located at a side of the light guide plate 10 near the light emitting unit 201, and the light incident surface 101 connects the second bottom surface 103 and the light emergent surface 102; wherein the thickness of the light guide plate 10 is greater than or equal to 0.8mm and less than or equal to 1.5 mm; the thickness of the light guide plate 10 refers to a distance between the light emitting surface 102 and the second bottom surface 103.
It can be understood that, in this embodiment, the thickness of the light guide plate 10 is greater than or equal to 0.8 mm and less than or equal to 1.5 mm, so that the overall thickness of the light guide plate 10 is reduced, and the backlight module 1 is made thinner; meanwhile, the light source support 202 includes the first accommodating cavity 100 and the second accommodating cavity 200, the light emitting unit 201 is disposed in the first accommodating cavity 100, and in the direction that the light source support 202 points to the light guide plate 10, the caliber of the first accommodating cavity 100 is gradually increased, and the caliber of the second accommodating cavity 200 is gradually decreased, so that on the basis of ensuring the thinning of the backlight module 1, the light emitting efficiency of the light emitting unit 201 is improved by designing the structure of the light source support 202, and more light rays can be emitted into the light guide plate 10 from the first opening 220, so that the light efficiency of the light guide plate 10 is improved, and the light leakage problem of the backlight module 1 is improved.
Further, the light guide plate 10 is provided with a plurality of slots 104 (only one slot is shown in fig. 4) arranged at intervals, one slot 104 is arranged corresponding to one light emitting component 20, wherein one slot 104 is embedded in the slot 104 with the corresponding light emitting component 20, and the light emitting component 20 is embedded in the slot 104; specifically, the plurality of grooves 104 are located on the light incident surface of the light guide plate 10, and the grooves 104 wrap the light emitting assembly 20, so as to achieve the effect of collecting the light emitted by the light emitting unit 201 into the light guide plate 10, reduce the loss of light to the greatest extent, and improve the light efficiency of the backlight module 1.
Specifically, in one embodiment, the slot 104 includes a slot 1041 and a slot bottom 1042 disposed opposite to each other, the slot bottom 1042 is located at a side of the slot 104 away from the light emitting component 20, and an orthographic projection of the light emitting component 20 on the light guide plate 10 is located in the slot 104; the area of the notch 1041 is smaller than or equal to the area of the groove bottom 1042, so that the light emitted by the light emitting unit 201 can be more emitted from the groove bottom 1042, and the light output of the light on the light output side is increased.
In one embodiment, the groove bottom 1042 and the second bracket 2022 have a first distance D1 therebetween; wherein the ratio of the thickness D2 of the second support 2022 to the first spacing D1 is greater than or equal to 1.9 and less than or equal to 16; specifically, in a direction perpendicular to the light source holder 202, a thickness D2 of the second holder 2022 is greater than or equal to 2.5 mm and less than or equal to 5 mm; the thickness D2 of the second bracket 2022 refers to a distance between the second top surface 210 and the first opening 220.
It can be appreciated that the present embodiment can control the space between the light emitting component 20 and the light guide plate 10 by controlling the ratio of the thickness of the second bracket 2022 to the first space D1, so as to meet different requirements for the use of the combined structure of the light emitting component 20 and the light guide plate 10, and improve the flexibility of the design; meanwhile, the distance between the light emitting component 20 and the light guide plate 10 is ensured to be within a preset size, so that the problem that the light guide plate 10 is burnt by a lamp band due to too small first distance D1 is avoided, the service life of the backlight module 1 is prolonged, and the problem that the light emitting effect of the backlight module 1 is influenced due to too large first distance D1 is also avoided, so that the optical performance of the backlight module 1 is more accurate and precise.
Specifically, please combine fig. 1, 9, 10, 11a, 11b and 11c; fig. 9 is a schematic structural diagram of a conventional backlight module; FIG. 10 is a schematic diagram of a conventional light emitting assembly; FIG. 11a is a schematic diagram illustrating a light emitting effect of a first light guide plate according to an embodiment of the present application; FIG. 11b is a schematic view illustrating a light emitting effect of a second light guide plate according to an embodiment of the present application; fig. 11c is a graph showing the brightness test values of the light guide plate of example 1 and the brightness test values of the light guide plate of comparative example 1 in table 1.
The existing backlight module 2 includes a light guide plate 50 and an optical assembly 60, the optical assembly 60 includes a light emitting unit 601 and a light source bracket 602, the light source bracket 602 includes a plurality of bracket inner walls 6021, a plurality of bracket inner walls 6021 enclose a third accommodating cavity 400, the light emitting unit 601 is disposed in the third accommodating cavity 400, the light guide plate 50 is disposed on a light emitting side of the light emitting unit 601, and the light guide plate 50 is disposed at intervals with the light source bracket 602.
In one embodiment, the structure of the light source holder provided in comparative example 1 is different from that of the light source holder provided in example 1; specifically, referring to the following table 1, table 1 shows the brightness test values of the light guide plate provided in example 1 and the brightness test values of the light guide plate provided in comparative example 1:
TABLE 1
The backlight module provided in comparative example 1 is the conventional backlight module shown in fig. 9, the light-emitting effect of the light guide plate provided in comparative example 1 is shown in fig. 11a, the backlight module provided in example 1 is the backlight module shown in fig. 1, and the light-emitting effect of the light guide plate provided in example 1 is shown in fig. 11 b; fig. 11a and 11b show the brightness effects of 1 to 8 test points on the light guide plate provided in comparative example 1 and 1 to 8 test points on the light guide plate provided in example 1 under the same conditions.
It should be noted that, the backlight module provided in comparative example 1 is different from the backlight module provided in example 1 in that:
In the backlight module 1 provided in embodiment 1, the light source support 202 includes a first support 2021 and a second support 2022, the first support 2021 includes a first accommodating cavity 100, the second support 2022 includes a second accommodating cavity 200, the light emitting unit 201 is disposed in the first accommodating cavity 100, and in a direction in which the light source support 202 points to the light guide plate 10, a caliber of the first accommodating cavity 100 gradually increases, and in a direction in which the second accommodating cavity 200 approaches to the light guide plate 10, a caliber of the second accommodating cavity 200 gradually decreases; in the backlight module 2 provided in comparative example 1, the light source holder 602 includes the third accommodating cavity 400, the light emitting unit 601 is disposed in the third accommodating cavity 400, and the aperture of the third accommodating cavity 400 is gradually increased in the direction in which the light source holder 602 points to the light guide plate 50.
In the backlight module 1 provided in embodiment 1, the thickness of the light guide plate 10 is 1.5 mm, the light guide plate 10 is provided with a plurality of slots 104 arranged at intervals, and the light emitting component 20 is embedded in the slots 104; in the backlight module 2 provided in comparative example 1, the thickness of the light guide plate 50 is 1.5 mm, the light guide plate 50 and the light emitting assembly 60 are disposed at intervals, and the cross section of the light guide plate 50 is rectangular; the Light Emitting unit 201 provided in embodiment 1 and the Light Emitting unit 601 provided in comparative example 1 are Light-Emitting diodes (LEDs).
It should be noted that, the length of the first support 2021 provided in example 1 is equal to the length of the light source support 602 provided in comparative example 1, and the thickness of the second support 2022 provided in example 1 is equal to the thickness of the light source support 602 provided in comparative example 1; the thickness of the second support 2022 provided in embodiment 1 is preferably 3.5 mm.
Referring to table 1, fig. 11a, fig. 11b, and fig. 11c, compared with comparative example 1, in example 1, by setting the cross-sectional area of the second accommodating cavity 200 on the side close to the light guide plate 10 to be smaller than the cross-sectional area of the second accommodating cavity 200 on the side far away from the light guide plate 10, the light collecting effect of the light source bracket 202 is improved, so that more light can be injected into the light guide plate 10 from the light source bracket 202, the light emitting efficiency of the light emitting unit 201 is improved, the light efficiency of the backlight module 1 is improved, and the risk of light leakage is avoided.
Fig. 12 is a schematic structural diagram of a display device according to an embodiment of the application.
The present embodiment provides a display device 3, the display device 3 includes a display panel 31 and a backlight module 1; the backlight module 1 is located at a side of the backlight of the display panel 31, and the display panel 31 may be a liquid crystal display panel, which is not particularly limited in this embodiment.
The liquid crystal display panel does not emit light, but the backlight module 1 provides a light source for the liquid crystal display panel; it will be appreciated that the backlight module 1 has been described in detail in the above embodiments, and the description thereof will not be repeated here.
Specifically, in a specific application, the display device may also be a display screen of a smart phone, a tablet computer, a notebook computer, a smart bracelet, a smart watch, smart glasses, a smart helmet, a desktop computer, a smart television or a digital camera, or even be applied to an electronic device with a flexible display screen.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above describes a backlight module and a display device provided by the embodiments of the present application in detail, and specific examples are applied to describe the principles and embodiments of the present application, and the description of the above embodiments is only for helping to understand the technical solution and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (11)
1. The utility model provides a backlight unit, its characterized in that includes light guide plate and a plurality of luminous subassembly, every luminous subassembly includes:
A light emitting unit;
The light source bracket comprises a first bracket and a second bracket, wherein the first bracket comprises a plurality of first bracket inner walls, the second bracket comprises a plurality of second bracket inner walls, a plurality of first bracket inner walls enclose a first accommodating cavity, a plurality of second bracket inner walls enclose a second accommodating cavity, the first accommodating cavity is communicated with the second accommodating cavity, and the light emitting unit is arranged in the first accommodating cavity;
The light guide plate is positioned at one side of the second bracket far away from the first bracket, orthographic projection of the light source bracket on the light guide plate is positioned in the light guide plate, the light guide plate is provided with a plurality of slots arranged at intervals, one slot is arranged corresponding to one light emitting component, one slot is arranged corresponding to the light emitting component, and the light emitting component is embedded in the slot;
The cross section area of the second accommodating cavity at one side close to the light guide plate is smaller than that of the second accommodating cavity at one side far away from the light guide plate.
2. A backlight module according to claim 1, wherein the aperture of the first accommodation chamber is gradually increased in a direction in which the first accommodation chamber approaches the light guide plate, and the aperture of the second accommodation chamber is gradually decreased in a direction in which the second accommodation chamber approaches the light guide plate.
3. A backlight module according to claim 2, wherein the first receiving cavity has a first top surface adjacent to the light guide plate, the second receiving cavity has a second top surface remote from the light guide plate, and the first top surface and the second top surface are coincident.
4. A backlight module according to claim 3, wherein the first receiving cavity and the second receiving cavity are symmetrically arranged about the first top surface or the second top surface.
5. A backlight module according to any one of claims 1 to 4, wherein the thickness of the light guide plate is greater than or equal to 0.8 mm and less than or equal to 1.5 mm.
6. The backlight module according to claim 1, wherein the slot has a slot bottom remote from the second bracket, and a first space is provided between the slot bottom and the second bracket;
Wherein the ratio of the length of the second bracket to the first spacing is greater than or equal to 1.9 and less than or equal to 16.
7. A backlight module according to claim 3, wherein the depth of the second accommodation cavity is equal to the thickness of the second bracket in a direction perpendicular to the light source bracket; wherein the thickness of the second bracket is more than or equal to 2.5 mm and less than or equal to 5 mm.
8. The backlight module according to claim 7, wherein the second accommodating cavity comprises a first opening opposite to the second top surface, and the first opening is located at a side of the second accommodating cavity close to the light guide plate;
The backlight module further comprises a filling part, wherein the filling part at least covers the first opening of the second accommodating cavity; wherein the refractive index of the filling part is larger than that of air.
9. The backlight module according to claim 1, wherein an included angle between inner walls of two opposite second brackets of the second bracket along the first direction is greater than or equal to 30 degrees and less than or equal to 40 degrees.
10. A backlight module according to claim 1, further comprising a back plate, the back plate comprising a bottom plate and a side plate, the side plate extending in a direction away from the bottom plate, the bottom plate and the side plate forming an accommodation space, the light guide plate and the light emitting assembly being both located in the accommodation space;
the light guide plate is arranged on the bottom plate, and the light source bracket is positioned on one side of the side plate, which is close to the light guide plate;
The second support is arranged on one side, close to the backboard, of the second support, the inner wall of the second support and the bottom plate form a preset angle, and the preset angle is an acute angle.
11. A display device comprising a backlight module according to any one of claims 1 to 10.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203982042U (en) * | 2014-06-30 | 2014-12-03 | 东莞市亚星半导体有限公司 | A kind of liquid crystal display screen of mobile phone of light leakage |
| CN114355673A (en) * | 2022-01-10 | 2022-04-15 | 武汉华星光电技术有限公司 | Backlight module and display panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101893189B (en) * | 2010-07-14 | 2011-12-14 | 深圳市华星光电技术有限公司 | Backlight module and display device |
| CN207502764U (en) * | 2017-11-28 | 2018-06-15 | 合肥泰沃达智能装备有限公司 | A kind of backlight module of light leakage light guide plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203982042U (en) * | 2014-06-30 | 2014-12-03 | 东莞市亚星半导体有限公司 | A kind of liquid crystal display screen of mobile phone of light leakage |
| CN114355673A (en) * | 2022-01-10 | 2022-04-15 | 武汉华星光电技术有限公司 | Backlight module and display panel |
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