CN111367119A - Direct type backlight lamp strip, backlight module and display device - Google Patents
Direct type backlight lamp strip, backlight module and display device Download PDFInfo
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- CN111367119A CN111367119A CN201811600259.4A CN201811600259A CN111367119A CN 111367119 A CN111367119 A CN 111367119A CN 201811600259 A CN201811600259 A CN 201811600259A CN 111367119 A CN111367119 A CN 111367119A
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- 238000000605 extraction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
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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
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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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- 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 provides a direct type backlight lamp bar, a backlight module and a display device. The direct type backlight lamp strip comprises a light source, a printed circuit board and an optical lens, wherein the light source and the optical lens are arranged on the printed circuit board, the optical lens covers the light source, the optical lens comprises a lens body and a plurality of microstructures, the microstructures are arranged in the lens body, the size of each microstructure meets a Rayleigh scattering condition, the microstructures are used for scattering light of a blue waveband in incident light emitted by the light source, and the blue waveband is a blue waveband with the wavelength smaller than 450 nm. The direct type backlight lamp strip can reduce the energy of short-wave blue light in emergent light without changing the wavelength of the blue light of incident light, so that a display device provided with the direct type backlight lamp strip has an eye protection function, and the color gamut saturation of the display device cannot be influenced.
Description
Technical Field
The invention relates to the field of liquid crystal display, in particular to a direct type backlight lamp bar, a backlight module and a display device.
Background
With the development of electronic technology and the increase of the requirements of consumers on television size, image quality and the like, liquid crystal televisions are becoming the mainstream development trend in the industry. The backlight module in the lcd generally includes an edge-type backlight module and a direct-type backlight (Bottom lighting) module, and the direct-type backlight module can reduce the thickness of the lcd panel compared to the edge-type backlight module.
A Light Emitting Diode (LED) is generally used as a Light source of a backlight module of a liquid crystal display, and Light emitted from the LED includes blue Light with a short wavelength. Relevant studies have shown that blue light, which is high energy and short wavelength, is absorbed by the crystalline lens of the human eye and the macula of the retina, causing irreversible damage to the eye. The user watches the liquid crystal display screen for a long time and can cause damage to eyes. In order to reduce the damage of blue light to eyes, a blue light LED chip with a long wavelength or quantum blue shift is usually used to attenuate the blue light.
However, selecting a long wavelength blue LED chip will cause the color gamut of the backlight module to be reduced, and the quantum blue shift will shift the shorter wavelength toward the blue, and the original brightness of the blue light will increase to the red light, resulting in an increase in the brightness of the red light and eye damage.
Disclosure of Invention
The invention provides a direct type backlight lamp bar, a backlight module and a display device, so that the display device provided with the direct type backlight lamp bar has an eye protection function and cannot influence the color gamut saturation of the display device.
In a first aspect, the present invention provides a direct type backlight lamp strip, where the direct type backlight lamp strip includes a light emitting source, a printed circuit board, and an optical lens, the light emitting source and the optical lens are disposed on the printed circuit board, and the optical lens covers the light emitting source, the optical lens includes a lens body and a plurality of microstructures, the microstructures are disposed inside the lens body, the size of each microstructure satisfies a rayleigh scattering condition, the microstructures are configured to scatter light in a blue waveband of incident light emitted by the light emitting source, and the blue waveband is a blue waveband with a wavelength less than 450 nm.
Through setting up a plurality of microstructures in the lens body, the size of every microstructure all satisfies the Rayleigh scattering condition, and this microstructure can scatter the light that the incident light that the light source sent is middle wavelength less than 450 nm's blue wave band, can not change the blue light wavelength of incident light, reduces the energy of short wave blue light in the emergent light to make the display device who sets up this straight following formula backlight lamp strip have the eyeshield function, and can not influence this display device's colour gamut saturation.
In one possible design, the microstructures range in size from 400nm to 450 nm.
The size of the microstructure can better scatter short-wave blue light.
In one possible design, the distribution density of the plurality of microstructures in the lens body is greater than a first preset value and less than a second preset value.
The distribution density of the microstructure can ensure that the optical lens does not influence the light extraction rate of light with other wavelengths while scattering short-wave blue light.
In one possible design, the plurality of microstructures is uniformly distributed within the lens body.
In one possible design, the distance between two adjacent microstructures is equal to twice the size of the microstructures.
Through setting up diameter and density as above of microstructure, can effectual scattering shortwave blue light, can not change the blue light wavelength of incident light, reduce the energy of shortwave blue light in the emergent light to make the display device who sets up this straight following formula backlight strip have the eyeshield function, and can not influence this display device's colour gamut saturation. And with the attenuation to the short wave blue light, can make the half-wave width of blue light narrow down, the blue light colour is purer, can improve backlight unit's colour gamut saturation.
In one possible design, the refractive index of the microstructures is greater than the refractive index of the lens body.
In one possible design, the direct type backlight light bar further includes an absorption layer disposed on the printed circuit board and located below the optical lens, and the absorption layer is configured to absorb light in a blue wavelength band scattered by the optical lens.
Through setting up the absorbed layer for the short wave blue light that optical lens scattering returned is absorbed, and can not go out by the secondary emission, with the harm that reduces short wave blue light.
In one possible design, the microstructures are spherical or polygonal in shape.
In a second aspect, the present invention provides a backlight module, which includes a back plate and the direct type backlight light bar of any one of the first aspect.
In a third aspect, the present invention provides a display device, which includes a housing, a liquid crystal display panel, and the backlight module according to the second aspect, wherein the backlight module and the liquid crystal display panel are both disposed in the housing, and the backlight module is disposed opposite to the liquid crystal display panel.
According to the direct type backlight lamp strip, the backlight module and the display device, the plurality of microstructures are arranged in the lens body, the size of each microstructure meets the Rayleigh scattering condition, the microstructures can scatter light with a blue waveband with the wavelength smaller than 450nm in incident light emitted by the light emitting source, the blue light wavelength of the incident light can not be changed, the energy of short-wave blue light in emergent light can be reduced, and therefore the display device with the direct type backlight lamp strip has an eye protection function, and the color gamut saturation of the display device cannot be influenced.
Drawings
Reference will now be made in brief to the accompanying drawings, which are needed for purposes of illustration and description of the prior art.
Fig. 1 is a schematic structural view of a direct type backlight light bar according to an embodiment of the present invention;
fig. 2A is a schematic diagram of a microstructure 32 provided in an embodiment of the present invention scattering blue light;
FIG. 2B is a diagram illustrating an energy distribution of scattered light according to an embodiment of the present invention;
fig. 3 is a schematic view illustrating light type distribution of a direct type backlight light bar according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a portion of an optical lens provided in accordance with an embodiment of the present invention;
fig. 5 is a schematic structural view of another direct type backlight light bar provided in the embodiment of the present invention;
fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Description of reference numerals:
1-a light emitting source;
2-a printed circuit board;
3-an optical lens;
31-a lens body;
32-microstructure;
4-an absorbing layer;
100-a liquid crystal display panel;
200-backlight module;
300-housing.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The liquid crystal display product comprises a liquid crystal display television, a liquid crystal display of a computer and the like, and the display device of the liquid crystal display product can comprise a liquid crystal panel, a backlight module, a power supply, a mainboard and a shell, wherein the liquid crystal panel does not emit light, and the liquid crystal panel needs to realize light emitting imaging by means of the backlight module so as to display colorful images. Specifically, the backlight module converts a common point or linear light source into a high-brightness and uniform surface light source through a simple and effective structure, and then the liquid crystal panel displays different pictures through the modulation of the light source. The following embodiments of the present invention provide a direct type backlight light bar, which can be applied in a backlight module of a display device to reduce the energy of light with a wavelength less than 450nm in the emergent light without changing the blue light wavelength of the incident light, so that the display device with the direct type backlight light bar has an eye protection function and the color gamut saturation of the display device is not affected. Namely, the direct type backlight lamp strip can reduce the energy of short-wave blue light harmful to human eyes in light emitted by the display device.
The following description will specifically explain the direct type backlight light bar of the present invention by using several specific embodiments.
Fig. 1 is a schematic structural diagram of a direct type backlight light bar according to an embodiment of the present invention, as shown in fig. 1, the direct type backlight light bar includes a light source 1, a printed circuit board 2, and an optical lens 3.
The light emitting source 1 and the optical lens 3 are disposed on the printed circuit board 2, and the optical lens 3 is housed on the light emitting source 1. The shape of the optical lens is as shown in fig. 1, that is, a groove for disposing the light-emitting source 1 is formed on the lower surface of the optical lens to cover the light-emitting source 1.
The optical lens 3 includes a lens body 31 and a plurality of microstructures 32, the microstructures 32 are disposed inside the lens body 31, each microstructure has a size satisfying a rayleigh scattering condition, and the microstructures 32 are used for scattering light in a blue wavelength band in incident light emitted from the light source 1, where the blue wavelength band is a blue wavelength band with a wavelength less than 450 nm. The light in the blue wavelength band may also be referred to as short-wave blue light.
Fig. 2A is a schematic diagram of the microstructure 32 according to the embodiment of the present invention scattering blue light, and fig. 2B is a light energy distribution diagram after scattering according to the embodiment of the present invention. The optical lens consisting of the lens body 31 and the plurality of microstructures 32 is a non-homogeneous medium. According to the rayleigh scattering principle, in inhomogeneous media the intensity of the scattered light is inversely proportional to the fourth power of the wavelength of the incident light, i.e. the shorter the wavelength the stronger the scattering. The microstructures 32 in the lens body can scatter blue light with short wavelength, the scattering of which can be seen in fig. 2A, where fig. 2A illustrates one microstructure 32, and the microstructure 32 does not affect the transmission direction of long-wave light, which refers to blue light with wavelength greater than 450nm (also called long-wave blue light) and other non-blue light (e.g. green light, yellow light, etc.). The microstructure 32 affects the transmission direction of the short-wave blue light, and as shown in fig. 2A, the short-wave blue light is scattered around through the microstructure 32. The scattered short-wave blue light has the same degree in the light advancing direction (i.e. the direction towards the display panel) and the opposite direction, and has the lowest degree in the direction perpendicular to the incident light, i.e. as shown in fig. 2B, the right half axis of the Z axis represents the advancing direction, the left half axis of the Z axis represents the opposite direction, and the short-wave blue light with nearly half energy in the incident light of the light source is scattered to the opposite direction through the microstructure 32, so that the energy of the short-wave blue light emitted by the backlight module is effectively reduced, the wavelength of the short-wave blue light is not changed, and the color gamut saturation of the backlight module provided with the direct type backlight lamp bar is not affected.
Fig. 3 is a light distribution schematic diagram of a direct type backlight light bar according to an embodiment of the present invention, as shown in fig. 3, incident light emitted by a light source 1 enters a lens body 31 through a lower surface of a groove of an optical lens 3 of the direct type backlight light bar, the lens body 31 is configured to diffuse the incident light, so as to achieve light distribution required in the direct type backlight module, that is, light distribution in fig. 3, which refers to a distribution form of light in a space, only light distribution of non-short wave blue light passing through the optical lens 3 is shown in fig. 3, a distribution form of short wave blue light passing through the optical lens 3 is not shown, wherein when the light reaches a microstructure 32, the microstructure 32 may scatter the short wave blue light, and light with other wavelengths may pass through the microstructure 32 without changing directions, that is shown in fig. 2A.
The straight following formula backlight lamp strip of this embodiment, through set up a plurality of microstructures in the lens body, the size of every microstructure all satisfies the rayleigh scattering condition, and this microstructure can scatter the light that the wavelength is less than 450 nm's blue wave band in the incident light that the light emitting source sent, can not change the blue light wavelength of incident light, reduces the energy of shortwave blue light in the emergent light, thereby makes the display device who sets up this straight following formula backlight lamp strip have the eyeshield function, and can not influence this display device's colour gamut saturation.
In some embodiments, the light source 1 may be an LED lamp, but it is understood that it may also be other light emitting devices, and the embodiments of the present invention are not necessarily illustrated. The number of the light sources is not limited in the embodiments of the present invention, and the above figures illustrate one light source specifically.
In some embodiments, microstructures 32 range in size from 400nm to 450 nm. For example, 420 nm. + -. 10 nm. I.e. the size of the microstructure 32 is better able to scatter short-wave blue light. For example, as shown in fig. 3, a plurality of microstructures 32 are disposed in the lens body 31, so that the optical lens 3 can scatter short-wave blue light. The size of any one of the microstructures 32 may be any value from 400nm to 450 nm.
That is, the microstructure 32 can scatter light with a wavelength equivalent to the size of the microstructure, and the size of the microstructure 32 is set to be 400nm to 450nm in the embodiment of the present invention, that is, the microstructure can scatter short-wave blue light.
The shape of the microstructure can be spherical, polygonal or sphere-like, and the microstructure can be flexibly arranged according to requirements. When the shape of the microstructure is spherical, the size of the microstructure 32 refers to the diameter of the microstructure 32.
It should be noted that the microstructure is schematically illustrated as a polygonal body in the above figures, and the embodiment of the present invention is not limited thereto.
In some embodiments, the distribution density of the plurality of microstructures 32 in the lens body 31 is greater than a first preset value and less than a second preset value. The first preset value is larger than the second preset value, and both the first preset value and the second preset value are larger than 0. For example, the distribution density of the plurality of microstructures 32 in the lens body 31 is 1/3. The distribution density of the microstructure can ensure that the optical lens does not influence the light extraction rate of light with other wavelengths while scattering short-wave blue light. The specific values of the distribution density within the range of the first preset value and the second preset value can enable the optical lens of the embodiment of the invention not to influence the light extraction rate of light with other wavelengths while scattering short-wave blue light, and the specific values of the first preset value and the second preset value can be flexibly set according to requirements.
In some embodiments, the plurality of microstructures 32 are uniformly distributed inside the lens body 31, so that the optical lens uniformly scatters short-wave blue light in the incident light.
In some embodiments, the distance between two adjacent microstructures may be equal to twice the size of the microstructures.
Taking the shape of the microstructure as a sphere and the microstructures uniformly distributed in the lens body 31 as an example, fig. 4 is a sectional view of a part of the structure of the optical lens provided in the embodiment of the present invention, as shown in fig. 4, a plurality of microstructures 32 are uniformly distributed in the lens body 31, and each microstructure 32 has the same size, which can be achieved by setting the distance (D) between two adjacent microstructures 32 equal to twice the size (R) of the microstructure 32, that is, D is 2R, so that the density of the microstructures 32 in the optical lens is 1/3. The embodiment can enable the optical lens to scatter the short-wave blue light without influencing the light extraction rate of light with other wavelengths.
The straight following formula backlight lamp strip of this embodiment through setting up diameter and density as above of microstructure, can effectual scattering shortwave blue light, can not change the blue light wavelength of incident light, reduce the energy of shortwave blue light in the emergent light to make the display device who sets up this straight following formula backlight lamp strip have the eyeshield function, and can not influence this display device's colour gamut saturation. And with the attenuation to the short wave blue light, can make the half-wave width of blue light narrow down, the blue light colour is purer, can improve backlight unit's colour gamut saturation.
In some embodiments, the refractive index of the microstructures 32 is greater than the refractive index of the lens body 31.
Fig. 5 is a schematic structural view of another direct type backlight light bar according to an embodiment of the present invention, as shown in fig. 5, based on the direct type backlight light bar, the direct type backlight light bar of this embodiment may further include an absorption layer 4, where the absorption layer 4 is disposed on the printed circuit board 2 and located below the optical lens 3, and the absorption layer 4 is configured to absorb light in a blue wavelength band scattered by the optical lens 3, that is, the absorption layer 4 may absorb short-wave blue light scattered by the optical lens 3.
In one implementation, the absorption layer 4 is disposed on the printed circuit board 2, the optical lens 3 is fixed on the printed circuit board 2 by means of four legs, as shown in fig. 5, and the optical lens 3 is located above the absorption layer 4. Fig. 5 is a diagram for illustrating the position of the absorption layer 4 with respect to the optical lens and the printed circuit board, in which only the position of the optical lens is illustrated by the temple, and other parts such as the lens body of the optical lens are not illustrated.
The absorption layer 4 is an absorption material which can be applied to a Printed Circuit Board (PCB) by means of a coating. The size and shape of the absorption layer can be flexibly set according to requirements. For example, in one implementation, the absorbent layer 4 may be circular as shown in fig. 5.
Specifically, as described above, the microstructure 32 in the optical lens 3 may scatter the short-wave blue light, so that a part of the short-wave blue light is transmitted to the opposite direction (the direction away from the display panel), and the part of the short-wave blue light may be absorbed by the absorption layer 4, so that the short-wave blue light scattered back by the optical lens is absorbed by the absorption layer and is not secondarily emitted, so as to reduce the harm of the short-wave blue light.
The straight following formula backlight lamp strip of this embodiment, through set up a plurality of microstructures in the lens body, the size of every microstructure all satisfies the rayleigh scattering condition, and this microstructure can scatter the light that the wavelength is less than 450 nm's blue wave band in the incident light that the light emitting source sent, can not change the blue light wavelength of incident light, reduces the energy of shortwave blue light in the emergent light, thereby makes the display device who sets up this straight following formula backlight lamp strip have the eyeshield function, and can not influence this display device's colour gamut saturation.
And through setting up the absorbed layer for the short wave blue light that optical lens scattering returned is absorbed, and can not go out by the secondary emission, in order to reduce the harm of short wave blue light.
The embodiment of the invention also provides a backlight module which comprises a back plate and the direct type backlight lamp strip in the embodiment.
The back plate is used for providing bottom support and fixing the printed circuit board. The direct type backlight lamp strip comprises a light emitting source 1, a printed circuit board 2 and an optical lens 3. The light emitting source 1 and the optical lens 3 are disposed on the printed circuit board 2, and the optical lens 3 is housed on the light emitting source 1. The shape of the optical lens is as shown in fig. 1, that is, a groove for disposing the light-emitting source 1 is formed on the lower surface of the optical lens to cover the light-emitting source 1. The optical lens 3 includes a lens body 31 and a plurality of microstructures 32, the microstructures 32 are disposed inside the lens body 31, each microstructure has a size satisfying a rayleigh scattering condition, and the microstructures 32 are used for scattering light in a blue band with a wavelength less than 450nm in incident light emitted from the light source 1.
In some embodiments, the backlight module may include a driving board, a reflective sheet, a diffusion plate, an optical film, and the like.
The driving board is used for controlling the brightness of the light emitting source 1 according to the image signal. The reflector plate is used for reflecting unscattered light sources into the light conduction region, and the reflection mode can be diffuse reflection so as to improve the utilization rate of light. The diffusion plate is used for increasing the light uniformity of the light source through refraction, reflection and scattering of light. The optical film is used for increasing the brightness of the light of the backlight module.
The backlight module device of this embodiment sets up a plurality of microstructures through in the lens body at straight following formula backlight lamp strip, and the size of every microstructure all satisfies the Rayleigh scattering condition, and this microstructure can be less than the light of 450 nm's blue wave band to the wavelength in the incident light that the light emitting source sent, can not change the blue light wavelength of incident light, reduces the energy of short wave blue light in the emergent light to make the display device who sets up this backlight module have the eyeshield function, and can not influence this display device's colour gamut saturation.
Fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 6, the display device provided in the present embodiment includes a housing 300, a liquid crystal display panel 100 and the backlight module 200 according to the first embodiment, wherein the backlight module 200 and the liquid crystal display panel 100 are both disposed in the housing 300, and the backlight module 200 is disposed opposite to the liquid crystal display panel 100. The backlight module 200 has a light emitting surface, which is disposed opposite to the liquid crystal display panel 100 and can provide a uniform surface light source for the liquid crystal display panel 100.
The backlight module 200 is provided with the direct type backlight lamp strip according to the above embodiments, and the structure, function and function thereof are described in detail in the foregoing embodiments and are not described herein again.
In this embodiment, the display device includes a housing, a liquid crystal display panel, and a backlight module, where the backlight module and the liquid crystal display panel are both disposed in the housing, and the backlight module is disposed opposite to the liquid crystal display panel. Wherein, straight following formula backlight lamp strip among backlight unit through set up a plurality of microstructures in the lens body, and the size of every microstructure all satisfies the Rayleigh scattering condition, and this microstructure can be less than the light of 450 nm's blue wave band to the incident light that the light emitting source sent, can not change the blue light wavelength of incident light, reduces the energy of short wave blue light in the emergent light to make this display device have the eyeshield function, and can not influence this display device's colour gamut saturation.
It should be noted that unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, as meaning fixedly connected, indirectly connected through intervening media, communicating between two elements, or interacting between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.
Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The direct type backlight lamp strip is characterized by comprising a light emitting source, a printed circuit board and an optical lens, wherein the light emitting source and the optical lens are arranged on the printed circuit board, the optical lens is covered on the light emitting source, the optical lens comprises a lens body and a plurality of microstructures, the microstructures are arranged inside the lens body, the size of each microstructure meets a Rayleigh scattering condition, the microstructures are used for scattering light of a blue waveband in incident light emitted by the light emitting source, and the blue waveband is a blue waveband with the wavelength smaller than 450 nm.
2. The direct type backlight lamp bar of claim 1, wherein the microstructures have a size ranging from 400nm to 450 nm.
3. The direct type backlight lamp bar of claim 2, wherein the distribution density of the plurality of microstructures in the lens body is greater than a first preset value and less than a second preset value.
4. The direct type backlight lamp bar of claim 3, wherein the plurality of microstructures are uniformly distributed inside the lens body.
5. The direct type backlight lamp bar of claim 4, wherein the distance between two adjacent microstructures is equal to twice the size of the microstructures.
6. The direct type backlight lamp bar of any one of claims 1 to 5, wherein the refractive index of the microstructures is larger than that of the lens bodies.
7. The direct-type backlight lamp strip of any one of claims 1 to 5, further comprising an absorption layer disposed on the printed circuit board and under the optical lens, wherein the absorption layer is configured to absorb light in a blue wavelength band scattered by the optical lens.
8. The direct type backlight lamp strip of any one of claims 1 to 5, wherein the microstructures are spherical or polygonal in shape.
9. A backlight module comprising a back plate and the direct type backlight lamp strip of any one of claims 1 to 8.
10. A display device, comprising a housing, a liquid crystal display panel and the backlight module according to claim 9, wherein the backlight module and the liquid crystal display panel are both disposed in the housing, and the backlight module is disposed opposite to the liquid crystal display panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811600259.4A CN111367119A (en) | 2018-12-26 | 2018-12-26 | Direct type backlight lamp strip, backlight module and display device |
Applications Claiming Priority (1)
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