CN110568666A - Display device and backlight module - Google Patents
Display device and backlight module Download PDFInfo
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- CN110568666A CN110568666A CN201910865194.4A CN201910865194A CN110568666A CN 110568666 A CN110568666 A CN 110568666A CN 201910865194 A CN201910865194 A CN 201910865194A CN 110568666 A CN110568666 A CN 110568666A
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- 239000010408 film Substances 0.000 description 6
- 239000012788 optical film Substances 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000005282 brightening Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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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
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
the invention discloses a display device and a backlight module, comprising a light bar; the light-emitting component on the lamp strip comprises a reflecting cover with an annular curved surface, and a light-emitting diode and a lens which are positioned in the reflecting cover. After the light emitted by the light emitting diode passes through the lens, the emergent light at the center can be deflected to the large-angle direction, so that the emergent light at each angle is relatively uniform. The small-angle light after passing through the lens can be directly emitted to the light-emitting side through the opening of the reflecting cover, the large-angle light after passing through the lens can be incident on the reflecting cover, and the light is reflected to the opening to be emitted to the light-emitting side through the reflection of the reflecting cover. Therefore, through the cooperation of the lens and the reflecting cover, the emergent light of the light-emitting diode can be fully utilized, the light can be collected to the maximum extent, and the light energy utilization rate can be improved; the light emergent angle can be adjusted by adjusting the curvatures of the lens and the reflector, so that the energy of the irradiation light spots on the light emergent side surface is relatively uniform, and the light emergent uniformity of the backlight module is improved.
Description
Technical Field
the invention relates to the technical field of display, in particular to a display device and a backlight module.
Background
the liquid crystal display screen has the advantages of low power consumption, small volume, low radiation and the like as the current mainstream display screen. The liquid crystal display panel is a non-self-luminous panel and needs to be matched with a backlight module for use.
The backlight module is divided into a lateral backlight module and a direct backlight module, the lateral backlight module has the advantage of thickness, but as large-size display screens are more and more widely applied in the field of televisions, the lateral backlight module has weak energy at the far end of the light guide plate, and even if the scattering microstructures are encrypted, the optical energy distribution of the lateral backlight module is still difficult to change. The double-side lamp arrangement method is difficult to solve the above problems and is expensive when faced with larger-sized panel displays. Therefore, the direct type backlight module has the irreplaceable advantage.
However, the light-emitting efficiency of the direct-type backlight module is low, the emergent light of the light source cannot be fully utilized, and the uniformity of the emergent light needs to be improved.
disclosure of Invention
the invention provides a display device and a backlight module, which are used for improving the utilization rate of light energy and improving the uniformity of backlight light emission.
In a first aspect, the present invention provides a display device comprising: the display panel is positioned on the light emitting side of the backlight module;
The backlight module includes: a light bar;
The lamp strip includes: the light emitting module comprises a circuit board and a plurality of light emitting components arranged on the circuit board;
The light emitting assembly includes: the LED comprises a light-emitting diode, a lens positioned on the light-emitting side of the light-emitting diode and a reflecting cover with an annular curved surface; the reflector and the circuit board form an accommodating space, and the light-emitting diode and the lens are positioned in the accommodating space;
the lens is used for receiving the emergent light of the light emitting diode and increasing the emergent angle of the light;
The reflecting cover is used for reflecting the emergent light of the light emitting diode to the opening of the reflecting cover for emergence.
In a possible implementation manner, in the above display device provided by the present invention, the annular curved surface satisfies a curved surface function corresponding to one of a spherical surface, an elliptical surface, a paraboloidal surface, a hyperboloid, a cubic surface, or a free-form surface.
in a possible implementation manner, in the display device provided by the invention, the opening of the reflector is circular or polygonal.
in a possible implementation manner, in the display device provided by the invention, the backlight module includes a plurality of light bars, the light bars extend along a first direction, the light bars are arranged along a second direction, and the first direction intersects with the second direction;
The distance between every two adjacent light-emitting assemblies on the light bar is a first distance; the distance between every two adjacent light bars is a second distance; the first intervals of the light bars are equal, and the first intervals are smaller than or equal to the second intervals.
in a possible implementation manner, in the display device provided by the invention, the light emitting assemblies on two adjacent light bars are arranged along the first direction in a staggered manner; the light emitting assemblies on two adjacent light bars are staggered by half of the first distance along the first direction.
in a possible implementation manner, in the display device provided by the present invention, in the light emitting assembly located at the corner of the backlight module, the reflector includes a first area, where the first area is a partial area of the reflector on a side of the light emitting diode departing from the corner; the slope of the part of the curved surface of the first area on the side close to the circuit board is greater than that of the part of the curved surface of the first area on the side far from the circuit board.
In a possible implementation manner, in the display device provided by the invention, a part of the curved surface of the first area on a side close to the circuit board is perpendicular to a plane where the circuit board is located.
In a possible implementation manner, in the display device provided by the present invention, the backlight module further includes: the light source module comprises a light bar, a diffusion plate and an optical diaphragm, wherein the diffusion plate is located on the light emitting side of the light bar and at a set distance between the light bars, and the optical diaphragm is located on one side of the light bar, and the diffusion plate deviates from the diffusion plate.
In a possible implementation manner, in the display device provided by the invention, the distance between the light emitting diode and the diffusion plate is 10-20 mm; the distance between two adjacent light-emitting assemblies on the same light bar is 50-100 mm.
In a second aspect, the present invention provides a backlight module, including: a light bar; the lamp strip includes: the light emitting module comprises a circuit board and a plurality of light emitting components arranged on the circuit board;
The light emitting assembly includes: the LED comprises a light-emitting diode, a lens positioned on the light-emitting side of the light-emitting diode and a reflecting cover with an annular curved surface; the reflector and the circuit board form an accommodating space, and the light-emitting diode and the lens are positioned in the accommodating space;
The lens is used for receiving the emergent light of the light emitting diode and increasing the emergent angle of the light;
The reflecting cover is used for reflecting the emergent light of the light emitting diode to the opening of the reflecting cover for emergence.
the invention has the following beneficial effects:
The display device and the backlight module provided by the invention comprise: the display panel is positioned on the light-emitting side of the backlight module; the backlight module includes: a light bar; the lamp strip includes: the LED module comprises a circuit board and a plurality of light-emitting components arranged on the circuit board; the light emitting assembly includes: the LED comprises a light-emitting diode, a lens positioned on the light-emitting side of the light-emitting diode and a reflecting cover with an annular curved surface; the light-emitting diode and the lens are positioned in the accommodating space; the lens is used for receiving the emergent light of the light-emitting diode and increasing the emergent angle of the light; and the reflecting cover is used for reflecting the emergent light of the light-emitting diode to the opening of the reflecting cover for emergence. After the light emitted by the light emitting diode passes through the lens, the emergent light at the center can be deflected to the large-angle direction, so that the emergent light at each angle is relatively uniform. The reflector of annular curved surface surrounds emitting diode and lens, and the opening that the low-angle light behind the lens can directly pass through the reflector is to the light-emitting side outgoing, and the high-angle light behind the lens can incide on the reflector, reflects light to opening to light-emitting side outgoing through the reflection of reflector. Therefore, through the cooperation of the lens and the reflecting cover, the emergent light of the light-emitting diode can be fully utilized, the light can be collected to the maximum extent, and the light energy utilization rate can be improved; the light emergent angle can be adjusted by adjusting the curvatures of the lens and the reflector, so that the energy of the irradiation light spots on the light emergent side surface is relatively uniform, and the light emergent uniformity of the backlight module is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structure diagram of a display device according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a backlight module according to an embodiment of the invention;
fig. 3 is a schematic top view of a light bar according to an embodiment of the present invention;
FIG. 4 is a second schematic cross-sectional view illustrating a backlight module according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an optical path of a light emitting device according to an embodiment of the present invention;
fig. 6 is a second schematic top view of the light bar according to the embodiment of the invention;
Fig. 7 is a schematic view illustrating an arrangement structure of a light bar according to an embodiment of the present invention;
fig. 8 is a second schematic view illustrating an arrangement structure of a light bar according to an embodiment of the invention;
Fig. 9 is a second schematic diagram of an optical path of a light emitting device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a display device, as shown in fig. 1, the display device including: a backlight module 100 and a display panel 200 located at the light-emitting side of the backlight module 100. The display device provided by the embodiment of the invention can be a display device such as a liquid crystal panel, a liquid crystal display, a liquid crystal television and the like, and can also be a mobile terminal such as a mobile phone, a tablet computer, an intelligent photo album and the like, which is not limited herein.
The backlight module 100 in the display device provided by the embodiment of the invention can be a direct type backlight module, the manufacturing cost of which is lower than that of a lateral type backlight module, and the direct type backlight module has the advantages of high brightness, good contrast, clear image quality, good color gamut, high energy utilization rate, good module uniformity, simple structure and area control. In practical application, the light source in the backlight module can adopt light emitting diodes, the light emitting light type of the light emitting diodes is Lambert type, most of light rays are positioned around the light emitting side of the light emitting diodes, and emergent light rays with large angles are less, so that light mixing blind areas generated by adjacent light emitting diodes are larger, and the thickness value of backlight light mixing is increased.
In view of this, the backlight module provided in the embodiment of the invention, as shown in fig. 2, includes: the light bar 10, the direct type backlight module, may generally include a plurality of light bars 10, and the light bars 10 are arranged along a predetermined direction. Fig. 3 is a schematic top view of the light bar shown in fig. 2, and as shown in fig. 2 and 3, the light bar 10 provided by the embodiment of the invention includes: a circuit board 101 and a plurality of light emitting components 102 disposed on the circuit board 101; the light emitting assembly 102 includes: a light emitting diode 1021, a lens 1022 positioned at the light emitting side of the light emitting diode 1021, and a reflective cover 1023 of an annular curved surface; the reflector 1023 and the circuit board 101 form an accommodating space, and the led 1021 and the lens 1022 are located in the accommodating space. The lens 1022 is configured to receive the outgoing light of the light emitting diode 1021 and increase the outgoing angle of the light; the reflector 1023 is used for reflecting the emergent light of the light emitting diode 1021 to the opening of the reflector for emergence.
In practical applications, the lens 1022 at the light emitting side of the light emitting diode 1021 may be a free-form lens, and the light emitted from the light emitting diode 1021 is deflected toward a large angle direction by the lens 1022, so that the light emitted from each angle is relatively uniform. The light-emitting diode 1021 and the lens 1022 are surrounded by the reflecting cover 1023 of the annular curved surface, the small-angle light after passing through the lens 1022 can be directly emitted to the light-emitting side through the opening of the reflecting cover 1023, the large-angle light after passing through the lens 1022 can be emitted to the reflecting cover 1023, and the light is reflected to the opening to the light-emitting side through the reflection of the reflecting cover 1023. Therefore, through the cooperation of the lens and the reflecting cover, the emergent light of the light-emitting diode can be fully utilized, the light can be collected to the maximum extent, and the light energy utilization rate can be improved; the light emergent angle can be adjusted by adjusting the curvatures of the lens and the reflector, so that the energy of the irradiation light spots on the light emergent side surface is relatively uniform, and the light emergent uniformity of the backlight module is improved.
In practical implementation, as shown in fig. 4, the backlight module 100 further includes: the light source module comprises a diffusion plate 20 and an optical film 30, wherein the diffusion plate 20 is located on the light emitting side of the light bar 10 and is away from the light bar by a set distance, and the optical film 30 is located on the side, away from the light bar 10, of the diffusion plate 20. The diffusion plate 20 may further homogenize the light emitted from the light emitting assembly 102, and then emit the homogenized light to the optical film 30. The optical film 30 may include: the composite sheet (Prism sheet) and the Micro-lens-Prism composite film (Micro-lens on Prism, abbreviated as MOP) are brightened, and the optical film 30 can adjust the light emergent angle and increase the light emergent brightness of the front surface of the backlight module.
in the backlight module according to the embodiment of the present invention, as shown in the schematic diagram of light path shown in fig. 5, the light type of the light emitted from the light emitting diode 1021 is lambertian, and the illuminance is not uniform, and the light emitted from the light emitting diode 1021 is uniform by disposing the lens 1022 on the light emitting side of the light emitting diode 1021, and the wide-angle light cannot be emitted to the front of the backlight module, so as to avoid loss of the wide-angle light emitted from the light emitting diode 1021 or emitted after transmission, a reflective cover 1023 with an annular curved surface is disposed around the light emitting diode 1021 and the lens 1022, and the reflective cover 1023 includes the light emitting diode 1021 and the lens 1022, and can reflect the wide-angle light to the opening of the reflective cover 1023, so that the light emitted from the light emitting diode 1021 can be emitted to the front of the backlight module, thereby reducing light loss to the greatest extent and. As shown in fig. 5, the light emitted from the led 1021 can be roughly classified into the following cases: a. b and c are both light rays; according to the law of reflection and the law of refraction, the trend and the distribution of light rays can be described in detail, the formula of the reflectivity is theta 1-theta 2, wherein theta 1 is a reflection angle, theta 2 is an incidence angle, and the reflection angle is equal to the incidence angle when the light rays are reflected on an interface according to the law of reflection; the formula of the law of refraction is n1sin θ 3 ═ n2sin θ 4, where n1 is the refractive index of the medium in which the incident light is located, n2 is the refractive index of the medium in which the refracted light is located, θ 3 is the incident angle, and θ 4 is the refractive index. From the law of reflection and the law of refraction, the direction of propagation of each ray can be determined. The light ray a is emitted from the light emitting diode 1021, refracted by the lens 1022 to the reflective cover 1023, and then reflected by the reflective cover 1023 to the diffusion plate 20; the light b is emitted from the led 1021, and is directly refracted to the diffuser 20 through the lens 1022; the light c is emitted from the led 1021, passes through the lens, and is reflected to the diffusion plate 20 by the reflecting cover 1023. The light emitted from the small angle is directly emitted to the diffusion plate 20, and the light emitted from the large angle is reflected by the reflecting cover 1023, emitted to the diffusion plate 20, diffused by the diffusion plate 20, irradiated to the brightness enhancement composite film and the micro-lens-prism composite film (optical film 30) again, and finally irradiated to a target area (e.g., a display panel) as a backlight of the display panel.
The light emitted from the center of the led 1021 is concentrated, and by designing the curved surface of the lens 1022, the light can be polarized in a large angle direction after passing through the lens 1022, and the light emitted from the large angle originally can be diffused by a larger angle through the lens. In order to avoid the loss of the light, the reflecting cover 1023 with the annular curved surface comprises the light emitting diodes 1021 and the lens 1022, and the light emitted at a large angle can be reflected to the opening position by reasonably designing the slope of the curved surface of the reflecting cover 1023, so that the light emitted from the light emitting diodes 1021 can be emitted to the diffusion plate 20 upwards, the utilization efficiency of the light is improved, and the loss of the light is reduced. And the energy distribution of the light spots irradiated on the diffusion plate 20 at each position is relatively uniform, the light rays are further homogenized through the diffusion plate 20, and then are emitted out through the brightening composite film and the micro-lens-prism composite film, so that uniform and bright backlight can be provided. In the backlight module provided by the embodiment of the invention, the light emitted by the light-emitting component is relatively uniform and has higher brightness, and the backlight requirement can be met after the light is homogenized by the diffusion plate, so that the arrangement of the brightening composite film can be omitted in the specific implementation, and the production cost is reduced.
In a specific implementation, the reflecting shade 1023 of the annular curved surface may be a rotationally symmetric structure along a central axis of the annular curved surface, and the annular curved surface may satisfy a curved function corresponding to one of a spherical surface, an elliptical surface, a paraboloid, a hyperboloid, a cubic surface, or a free-form surface. As regards the determination of the profile of the reflector 1023, it can be calculated by geometrical optics, taking a parabolic reflector as an example: the general equation for a parabola is y ═ a × x2Considering the overall thickness of the backlight module, if the light mixing distance OD from the led 1021 to the diffuser 20 is set to be 15mm, and the radius of the light spot from the light emitting element 102 to the diffuser 20 is set to be 30-50 mm, the value range of the coefficient a of the parabolic equation can be calculated to be 0.006-0.017, and thus the surface type of the reflector 1023 can be determined. In practical applications, the value range of the coefficient a can be changed according to the change of the OD value and the radius of the light spot. Other surface-type reflectors can be solved similarly, and are not described herein.
In an implementation, the opening of the reflector 1023 on the side facing away from the circuit board 101 may be circular as shown in fig. 3, or may be polygonal as shown in fig. 6. The reflecting shade 1023 with a circular opening can be a rotationally symmetric curved surface as described above, and can be formed into an annular curved surface by determining the line type of the curved surface and rotating along the central axis. When the reflecting covers 1023 with polygonal openings are adopted, the reflecting covers 1023 of the adjacent light-emitting assemblies 102 can be closely arranged along a straight edge, so that the arrangement distance of the light-emitting assemblies 102 can be reduced, and the number of the light-emitting assemblies on a single light bar can be increased; meanwhile, the light emitting components 102 arranged closely can produce better light mixing effect, thereby reducing the light mixing distance and reducing the overall thickness of the backlight module. In general, the opening of the reflector 1023 on the side away from the circuit board 101 may be square, or may be regular pentagon, regular hexagon, or the like, which is not limited herein.
In the direct-type backlight module, as shown in fig. 7, the backlight module generally includes a plurality of light bars 10, the light bars 10 can extend along a first direction d1, and the light bars are arranged along a second direction d2, wherein the first direction d1 intersects the second direction d 2. In the arrangement structure shown in the figure, the first direction d1 and the second direction d2 are perpendicular to each other. The distance between two adjacent light emitting assemblies 102 on the light bar 10 is a first distance x; the distance between two adjacent light bars 10 is a second distance y; the first distances x on the lamp strips are equal, and the first distances x are smaller than or equal to the second distances y.
in the backlight module provided by the embodiment of the invention, one or more light emitting elements 102 are arranged on the light bars, and the distances between the light emitting elements 102 (i.e., the first distance x) may be equal, and the number of the light emitting elements 102 on each light bar may be controlled according to actual requirements. A certain number relationship is formed between the second distance y between two adjacent light bars 10 and the first distance x between two adjacent light emitting assemblies 102 on the same light bar, so that the emergent light of two adjacent light bars 10 is locally mixed when reaching the diffusion plate 20, and the part of the light bar with low edge brightness is enhanced, so that the edge brightness is equivalent to the middle brightness. In order to protect a sufficient light mixing effect, a second distance y between two adjacent light bars may be set to be equal to a first distance x between two adjacent light emitting assemblies 102 on the same light bar; the diffusion plate 20 may further homogenize the light, and may also appropriately increase the second distance y between two adjacent light bars, so that the second distance y between two adjacent light bars is greater than the first distance x between two adjacent light emitting assemblies 102 on the same light bar.
In a specific implementation, the plurality of light bars in the backlight module may be arranged in the manner shown in fig. 7, each light bar has the same structure, and the plurality of light bars are aligned to make the light emitting elements 102 present an array distribution. In addition, the arrangement mode shown in fig. 8 may also be adopted, and the light emitting assemblies on two adjacent light bars are arranged along the first direction d1 in a staggered manner; the light emitting assemblies on two adjacent light bars are staggered by half of the first distance x along the first direction d 1. Thus, when the first distance x is equal to the second distance y, three adjacent light emitting assemblies 102 on two adjacent light bars 10 can form an equilateral triangle; when the first distance x is smaller than the second distance y, the three adjacent light emitting assemblies 102 on two adjacent light bars 10 may form an isosceles triangle. The opening of the reflecting shade 1023 of the light emitting component 102 deviating from one side of the circuit board 101 can be set to be a circular opening, the light emitting component 102 on two adjacent light bars is staggered along the first direction d1, the distance of the adjacent light emitting component on the two light bars can be adjusted, and therefore the light mixing degree of the two light emitting components is changed, and the requirements of the backlight module are met. In practical application, the light bars can be arranged in any one of the above manners according to actual requirements, and the arrangement is not limited herein.
The backlight module can be set to be an inclined plane at the corner, so that too many light-emitting components 102 cannot be arranged at the corner, the light-emitting brightness at the corner of the backlight module is smaller than that at the middle position, and a dark corner phenomenon is generated. In order to eliminate the above phenomenon, as shown in fig. 9, in the light emitting assembly at the corner of the backlight module according to the embodiment of the present invention, the reflective cover 1023 includes a first area s, where the first area s is a partial area of the reflective cover on a side of the light emitting diode 1021 deviating from the corner; the slope of the partial curved surface s1 of the first region s on the side close to the circuit board is larger than the slope of the partial curved surface s2 of the first region s on the side away from the circuit board. The slope is the inclination degree of the tangent line of the curved surface relative to the plane where the circuit board 101 is located, and the larger the included angle between the tangent line of the curved surface and the plane where the circuit board 101 is located is, the larger the slope of the curved surface is; conversely, the smaller the included angle between the tangent of the curved surface and the plane of the circuit board 101 is, the smaller the slope of the curved surface is.
The light reflecting covers of the light emitting components positioned at the four corners of the backlight module are different from the light emitting components positioned at the non-corner positions. The light reflecting cover of the light emitting component positioned at the corner still meets the curved surface function of one of a spherical surface, an elliptical surface, a paraboloid, a cubic curved surface or other free curved surfaces in other areas except the first area s, and the curved surface in the first area s can enable part of light emitted by the light emitting diode 1021 to be reflected to the corner position of the light emitting component through the change of the slope, so that light is supplemented for the corner position, and the dark corner condition is improved.
in an implementable manner, as shown in fig. 9, the partial curved surface s1 of the first region s on the side close to the circuit board 101 may be set to be perpendicular to the plane of the circuit board 101 (when the slope of the curved surface s1 is infinite). Specific light paths are shown in fig. 9, fig. 9 only shows one light emitting assembly at the corner C of the backlight module, and other components are omitted, wherein d, e, f and g all represent light rays. The light ray d is emitted from the light emitting diode 1021, is refracted by the lens 1022 to the reflecting cover 1023, and is reflected to the target area by the reflecting cover 1023; the light e is emitted from the light emitting diode 1021, and is directly refracted to the target area through the lens 1022; the light f is emitted from the led 1021, does not pass through the lens 1022, and is reflected to the target area through the reflector 1023; the light g is emitted from the led 1021, and is reflected to the corner position C via the vertical surface s1 in the first area s of the reflector 1023, so as to solve the dark corner problem. The light-emitting component provided by the embodiment of the invention can solve the problem of dark corners and can be matched with light mixing of adjacent light-emitting components. In practical applications, the height of the vertical surface s1 can be set according to practical situations, for example, the height of the vertical surface can be set by collimating the light emitted from the led 1021 by an angle of 170 ° to 180 °, so that the vertical surface s1 can receive the light emitted from the led 1021 by an angle of 170 ° to 180 °, and reflect the light to the corner position C of the light emitting assembly, thereby increasing the brightness of the corner region. In addition, the slope of the curved surface s1 in the first region s should be set according to the actual angle of the incident light and the required angle of the reflected light, and the embodiment of the present invention is described by taking a vertical surface as an example, and the slope of the curved surface should meet the emission requirement of the light in practical application, which is not limited herein.
in the backlight module provided by the embodiment of the invention, the light mixing distance between the light emitting diode 1021 and the diffusion plate 20 can be set to be 10-20mm in consideration of the whole thickness of the backlight module; accordingly, the distance between two adjacent light emitting elements 102 (the first distance d1) on the same light bar 10 can be set to 50-100mm through optical design. The lens 1022 in the light emitting device 102 may be a free-form lens made of PMMA; the reflector 1023 in the light emitting assembly 102 can be made of plastic (such as PMMA or PC), metal or glass material, but not limited thereto.
Based on the same inventive concept, an embodiment of the present invention provides a backlight module, as shown in fig. 4, the backlight module includes: a light bar 10; the light bar 10 includes: a circuit board 101 and a plurality of light emitting components 102 disposed on the circuit board 101; the light emitting assembly 102 includes: a light emitting diode 1021, a lens 1022 positioned at the light emitting side of the light emitting diode 1021, and a reflective cover 1023 of an annular curved surface; the reflector 1023 and the circuit board 101 form an accommodating space, and the light emitting diode 1021 and the lens 1022 are located in the accommodating space; the lens 1022 is configured to receive the outgoing light of the light emitting diode 1021 and increase the outgoing angle of the light; the reflector 1023 is used for reflecting the emergent light of the light emitting diode 1021 to the opening of the reflector 1023 for emergence.
after the light emitted by the light emitting diode passes through the lens, the emergent light at the center can be deflected to the large-angle direction, so that the emergent light at each angle is relatively uniform. The reflector of annular curved surface surrounds emitting diode and lens, and the opening that the low-angle light behind the lens can directly pass through the reflector is to the light-emitting side outgoing, and the high-angle light behind the lens can incide on the reflector, reflects light to opening to light-emitting side outgoing through the reflection of reflector. Therefore, through the cooperation of the lens and the reflecting cover, the emergent light of the light-emitting diode can be fully utilized, the light can be collected to the maximum extent, and the light energy utilization rate can be improved; the light emergent angle can be adjusted by adjusting the curvatures of the lens and the reflector, so that the energy of the irradiation light spots on the light emergent side surface is relatively uniform, and the light emergent uniformity of the backlight module is improved.
The principle of the backlight module provided by the embodiment of the invention for solving the problems is similar to that of the display device, so the implementation of the backlight module can refer to the implementation of the display device, and repeated details are not repeated.
the display device and the backlight module provided by the invention comprise: the display panel is positioned on the light-emitting side of the backlight module; the backlight module includes: a light bar; the lamp strip includes: the LED module comprises a circuit board and a plurality of light-emitting components arranged on the circuit board; the light emitting assembly includes: the LED comprises a light-emitting diode, a lens positioned on the light-emitting side of the light-emitting diode and a reflecting cover with an annular curved surface; the light-emitting diode and the lens are positioned in the accommodating space; the lens is used for receiving the emergent light of the light-emitting diode and increasing the emergent angle of the light; and the reflecting cover is used for reflecting the emergent light of the light-emitting diode to the opening of the reflecting cover for emergence. After the light emitted by the light emitting diode passes through the lens, the emergent light at the center can be deflected to the large-angle direction, so that the emergent light at each angle is relatively uniform. The reflector of annular curved surface surrounds emitting diode and lens, and the opening that the low-angle light behind the lens can directly pass through the reflector is to the light-emitting side outgoing, and the high-angle light behind the lens can incide on the reflector, reflects light to opening to light-emitting side outgoing through the reflection of reflector. Therefore, through the cooperation of the lens and the reflecting cover, the emergent light of the light-emitting diode can be fully utilized, the light can be collected to the maximum extent, and the light energy utilization rate can be improved; the light emergent angle can be adjusted by adjusting the curvatures of the lens and the reflector, so that the energy of the irradiation light spots on the light emergent side surface is relatively uniform, and the light emergent uniformity of the backlight module is improved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A display device, comprising: the display panel is positioned on the light emitting side of the backlight module;
The backlight module includes: a light bar;
The lamp strip includes: the light emitting module comprises a circuit board and a plurality of light emitting components arranged on the circuit board;
The light emitting assembly includes: the LED comprises a light-emitting diode, a lens positioned on the light-emitting side of the light-emitting diode and a reflecting cover with an annular curved surface; the reflector and the circuit board form an accommodating space, and the light-emitting diode and the lens are positioned in the accommodating space;
The lens is used for receiving the emergent light of the light emitting diode and increasing the emergent angle of the light;
The reflecting cover is used for reflecting the emergent light of the light emitting diode to the opening of the reflecting cover for emergence.
2. The display device according to claim 1, wherein the annular curved surface satisfies a surface function corresponding to one of a spherical surface, an elliptical surface, a paraboloidal surface, a hyperboloid, a cubic surface, and a free-form surface.
3. the display device of claim 1, wherein the opening of the reflector is circular or polygonal.
4. The display device of claim 1, wherein the backlight module comprises a plurality of the light bars, the light bars extend along a first direction, the light bars are arranged along a second direction, and the first direction and the second direction intersect;
the distance between every two adjacent light-emitting assemblies on the light bar is a first distance; the distance between every two adjacent light bars is a second distance; the first intervals of the light bars are equal, and the first intervals are smaller than or equal to the second intervals.
5. the display device of claim 4, wherein the light emitting elements on two adjacent light bars are arranged in a staggered manner along the first direction; the light emitting assemblies on two adjacent light bars are staggered by half of the first distance along the first direction.
6. The display device as claimed in claim 3, wherein in the light emitting elements at the corners of the backlight module, the reflector comprises a first region, and the first region is a partial region of the reflector on the side of the light emitting diodes departing from the corner; the slope of the part of the curved surface of the first area on the side close to the circuit board is greater than that of the part of the curved surface of the first area on the side far from the circuit board.
7. The display device according to claim 6, wherein a portion of the curved surface of the first region on a side close to the circuit board is perpendicular to a plane on which the circuit board is located.
8. The display device according to any one of claims 1 to 6, wherein the backlight module further comprises: the light source module comprises a light bar, a diffusion plate and an optical diaphragm, wherein the diffusion plate is located on the light emitting side of the light bar and at a set distance between the light bars, and the optical diaphragm is located on one side of the light bar, and the diffusion plate deviates from the diffusion plate.
9. The display device according to claim 8, wherein a distance between the light emitting diode and the diffusion plate is 10 to 20 mm; the distance between two adjacent light-emitting assemblies on the same light bar is 50-100 mm.
10. A backlight module, comprising: a light bar; the lamp strip includes: the light emitting module comprises a circuit board and a plurality of light emitting components arranged on the circuit board;
The light emitting assembly includes: the LED comprises a light-emitting diode, a lens positioned on the light-emitting side of the light-emitting diode and a reflecting cover with an annular curved surface; the reflector and the circuit board form an accommodating space, and the light-emitting diode and the lens are positioned in the accommodating space;
The lens is used for receiving the emergent light of the light emitting diode and increasing the emergent angle of the light;
The reflecting cover is used for reflecting the emergent light of the light emitting diode to the opening of the reflecting cover for emergence.
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| CN201910865194.4A CN110568666A (en) | 2019-09-12 | 2019-09-12 | Display device and backlight module |
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| CN201910865194.4A CN110568666A (en) | 2019-09-12 | 2019-09-12 | Display device and backlight module |
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| CN110568666A true CN110568666A (en) | 2019-12-13 |
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| CN113031341A (en) * | 2021-03-12 | 2021-06-25 | 业成科技（成都）有限公司 | Light emitting diode light source assembly and reflection structure and display structure thereof |
| CN113296309A (en) * | 2020-02-24 | 2021-08-24 | 海信视像科技股份有限公司 | Display device |
| CN113296315A (en) * | 2021-06-02 | 2021-08-24 | 睿合科技有限公司 | Efficient ultrathin direct type backlight equipment |
| CN113820885A (en) * | 2020-06-18 | 2021-12-21 | 京东方科技集团股份有限公司 | Curved surface backlight unit and display device |
| CN115356876A (en) * | 2022-08-29 | 2022-11-18 | 北京京东方显示技术有限公司 | Front light source and display device |
| WO2023231505A1 (en) * | 2022-06-02 | 2023-12-07 | 惠州视维新技术有限公司 | Backlight module and display device |
| WO2024045287A1 (en) * | 2022-08-29 | 2024-03-07 | 瑞仪光电(苏州)有限公司 | Reflective sheet capable of expanding peripheral reflection area, backlight module, and display apparatus |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Applicant after: Hisense Visual Technology Co., Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Applicant before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |
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Application publication date: 20191213 |