CN106842703B - A kind of asymmetric lens and its backlight module - Google Patents
A kind of asymmetric lens and its backlight module Download PDFInfo
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- CN106842703B CN106842703B CN201710060474.9A CN201710060474A CN106842703B CN 106842703 B CN106842703 B CN 106842703B CN 201710060474 A CN201710060474 A CN 201710060474A CN 106842703 B CN106842703 B CN 106842703B
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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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
-
- 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
-
- 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
- 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)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a kind of asymmetric lens and its backlight modules, it is related to lens technologies and backlight display technical field, the present invention uses Lighttools design of Simulation, oblong hot spot is shaped as by the circular light spot that asymmetric lens issue CSP light source, the operating distance between lamp bar is expanded, light source concentrates in lamp bar, compared to traditional down straight aphototropism mode set, the quantity of the pcb board of higher cost can be reduced, to reduce production cost；Mould group corner brightness can also be improved with duration ellipticalness hot spot, improves the brightness uniformity of entire backlight module, a kind of brightness uniformity is high so that design has been produced, light efficiency is high, symmetric lens and its backlight module at low cost.
Description
Technical field
The present invention relates to lens technologies and backlight display technical field, especially a kind of asymmetric lens and its backlight mould
Group.
Background technique
Available liquid crystal display field, since liquid crystal molecule itself does not have luminous power, in existing liquid crystal display
Additional light source is needed in device come obtain display picture, light source mostly uses Light-emitting diode LED at present, by backlight module diffusion and
LED light source is extended to area source output by even light action.At this stage, the backlight module of display device can be divided into side entering type and straight
Two kinds of following formula, since down straight aphototropism mode set does not need setting light guide plate compared to side entrance back module, and with inexpensive excellent
Gesture, it is deep to be welcome by the majority of consumers, side entrance back module compared to down straight aphototropism mode set because must install additional light guide plate and
Lamp bar heat sink makes to provide no advantage against in side entrance back module price.
Meanwhile (such as patent No. 200810303277.6, patent name are downward back backlight to traditional down straight aphototropism mode set
The invention of mould group), LED is Lambertian light source, has rotational symmetry special in optical lens (TV lens) structure installed additional on LED
Property, therefore the light that LED is issued, after the diffusion of TV lens, the hot spot of formation is the circular light spot with rotational symmetry characteristic, and
It is about 4:3 or the elevation of 16:9 that down straight aphototropism mode set and its display device, which generally have length-width ratio, hot spot and shape
It mismatches, necessarily causes the uneven of backlight module corner and central area brightness, influence the quality for watching picture.Traditional side
Enter formula backlight module (patent No. 200910105927.0, patent name are the invention of side entrance back module), the light that LED is issued
Line needs the refraction of scattering by light guide plate mesh point, light guide plate, and the LED light source of side incident is made to be converted into the face of front output
Light source, the refraction of the Multiple Scattering and light guide plate of site cause side entrance back module light efficiency low so that optical energy loss is serious,
So that display picture brightness is low.
In the case where consumer raises the price to the increasingly raising of viewing effect, raw material and reduces the main trend of cost, how to change
A kind of high brightness uniformity, light efficiency height, backlight module at low cost and its display dress are produced in traditional direct-type backlight, design
It sets, becomes industry strategic point problem to be solved.
Summary of the invention
(1) technical problems to be solved
The technical problem to be solved by the present invention is to backlight module brightness irregularities in traditional technology to be solved, light efficiency difference and at
This high problem.
(2) technical solution is said
In order to solve the above technical problems, the technical scheme adopted by the invention is that: a kind of asymmetric lens and its backlight mould
Group, the structure of the backlight module include: cavity, reflecting paper, lamp bar, diffuser plate and optical diaphragm, and the cavity is backlight mould
Group monnolithic case；Reflecting paper bottom surface at least a line aperture；The lamp bar includes PCB substrate, CSP light source, asymmetric
Mirror and connector, the backlight backlight module include at least a lamp bar, on the lamp bar device and cavity bottom surface；The diffusion
Plate is mounted on above cavity；The optical diaphragm is mounted on diffuser plate.
The light that CSP light source issues, after asymmetric lens, the circular light spot that CSP source light is formed is shaped as
Elliptical spot, in most of light direct projection to diffuser plate, remainder light is projected in reflecting paper, anti-by reflecting paper
It penetrates, then projects on diffuser plate.The light of all directive diffuser plates, under the two-way dispersion characteristic of diffuser plate, just from diffuser plate
Face outgoing, using the even light action of optical diaphragm, to form the planar luminous body of high brightness and uniform luminance.
Further, the CSP light source is wafer-level package Chip Scale Package, is compared to traditional LED
Light source, CSP light source have many advantages, such as that dimension of light source is small, optical density is high, photochromic consistency is good, and it is high to be more advantageous to design production light efficiency
Backlight module.
Further, the asymmetric lens material is PMMA, by exit facet, the plane of incidence, bottom cloudy surface, flat surface and peace
It fills column to constitute, the horizontal section of the exit facet and the plane of incidence is ellipsoid, and plane of incidence long axis direction is perpendicular to exit facet
Long axis direction, while plane of incidence long axis direction is parallel to light source orientation in lamp bar, i.e. exit facet long axis direction is perpendicular to lamp
Light source orientation on item；The bottom cloudy surface is inclined surface, has certain cloudy surface grade；The flat surface is located at the plane of incidence
Between the cloudy surface of bottom, and width is smaller, is used for assisted injection molding process；The mounting post shares 4, for the fixed lens of dispensing
In in lamp bar.
Further, the exit facet of the asymmetric lens, top is smooth, does not have any wedge angle, i.e., at the top of exit facet
Section is parallel to the horizontal plane.The plane of incidence of the asymmetric lens, top is smooth, does not have any wedge angle, i.e., at the top of exit facet
Section is parallel to the horizontal plane.
Further, for the asymmetric lens,Light is inclined
Turn mainly to be determined by the plane of incidence.
Further, the lamp bar include: cover copper circuit PCB substrate, CSP light source and be mounted on it is non-right above light source
Claim lens；The CSP light source and asymmetric lens pairing occur, and CSP light source is located at the asymmetric lens plane of incidence and is formed
Inner fovea part in；Described covering in copper circuit PCB substrate has 4 fixed glue grooves around every CSP light source, and 4 fixed glue
Slot non-rotational symmetry guarantees the long and short axis side of asymmetric lens convenient for the fixed asymmetric lens of the correct dispensing of automation patch device
To correctness.
Further, after the beam shaping that the asymmetric lens issue CSP light source, light spot energy is to perpendicular to lamp
Light source arragement direction offset, to expand in the irradiation area perpendicular to lamp bar light source arragement direction, so as to expand
Lamp bar spacing reduces lamp bar quantity, reduces cost.
Further, after the beam shaping that the asymmetric lens issue CSP light source, in lamp bar light source orientation
On, 170 ° of distribution curve flux full-shape >, distribution curve flux brightness peak intensity is I；On perpendicular to light source orientation, distribution curve flux
170 ° of full-shape >, distribution curve flux brightness peak > 1.8XI.
Further, the reflecting paper is made of bottom surface and 4 sides, reflecting paper bottom surface at least a line aperture,
Asymmetric lens are installed in aperture, the reflecting paper opening diameter >=asymmetric lens long axis length, when reflecting paper has two rows
When the above aperture, line-spacing (lamp bar spacing) >=1.8X light source spacing.The backlight module is compared to traditional straight-down negative scheme, light source
It concentrates in a small number of lamp bars, lamp bar spacing >=1.8X light source spacing, backlight module is mixed by oblong hot spot and is superimposed, and is formed high
Brightness and the high planar luminous body of uniformity, to make lamp bar negligible amounts.
Further, the lamp bar is fixed by screws on cavity bottom surface, and lamp bar after the assembly is completed, from top to bottom, fills
With reflecting paper in cavity, reflecting paper aperture covered asymmetric lens, and reflecting paper after the assembly is completed, need to guarantee the smooth of reflection
Property, reduce the tilting of reflecting paper bottom surface and wave-like to the greatest extent, can be with double-sided adhesive fixation reflex on cavity bottom surface, then will spread
Optical diaphragm is installed on diffuser plate by plate assembly on cavity.
Further, the distance (OD value) of the diffuser plate lower surface and cavity bottom surface is generally 28-35mm, the optics
Brightness enhancement film, composite membrane or diffusion barrier generally may be selected in diaphragm.
Further, the present invention has scalability in backlight module in scheme.
Further, when the present invention program is using single lamp bar, 28 to 32 cun of backlight modules and its display device are applicable in；This hair
When bright scheme is using double lamp bars, it is applicable in 40-43 cuns of backlight modules and its display device；When the present invention program uses three lamp bars,
It is applicable in 55-60 cuns of backlight modules and its display device；When the present invention program uses four lamp bars, it is applicable in 70-80 cuns of backlight modules
And its display device.
Further, the present invention program is also used as light emitting device, enters photograph as the flat lamp for providing uniform illumination
Bright field.
(3) beneficial effect
Advantages of the present invention: by completely new asymmetric lens, the circular light spot of CSP light source is made to be shaped as oblong light
Spot expands the operating distance between lamp bar, and light source concentrates in lamp bar, compared to traditional down straight aphototropism mode set, it is possible to reduce
The quantity of the pcb board of higher cost, to reduce production cost；It is bright that mould group corner can also be improved with duration ellipticalness hot spot
Degree, to improve the brightness uniformity of entire backlight module.
Detailed description of the invention
Fig. 1 is 32 cun of back light module unit structure schematic diagrames that the embodiment of the present invention one provides；
Fig. 2 is conventional down straight aphototropism mode set light mixing schematic diagram；
Fig. 3 is 32 cun of backlight module light mixing schematic diagrams that the embodiment of the present invention one provides；
Fig. 4 is asymmetric lens schematic diagram provided in an embodiment of the present invention；
Fig. 5 is asymmetric lens plane of incidence polarisation schematic diagram provided in an embodiment of the present invention；
Fig. 6 is asymmetric lens exit facet polarisation schematic diagram provided in an embodiment of the present invention；
Fig. 7 is elliptical spot mesh mapping method provided in an embodiment of the present invention；
Fig. 8 is 32 cun of backlight module index paths that the embodiment of the present invention one provides；
Fig. 9 is asymmetric lens light distribution curve provided in an embodiment of the present invention；
Figure 10 is 43 cun of back light module unit structure schematic diagrames provided by Embodiment 2 of the present invention；
Figure 11 is 43 cun of backlight modules light mixing schematic diagram provided by Embodiment 2 of the present invention；
Fig. 4 is as Figure of abstract；
101 it is optical diaphragm in figure, 102 diffuser plates, 200 be reflecting paper, 300 be lamp bar, 400 be cavity, 301 is
LED light source, 201 for 500 be asymmetric lens, 501 be exit facet, 502 be the plane of incidence, 503 be bottom cloudy surface, 504 be suspension column,
505 be flat surface.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.As shown in figure, Fig. 1 is that the embodiment of the present invention one provides
32 cun of back light module unit structure schematic diagrames, the back light module unit structure scheme include: optical diaphragm 101, diffuser plate 102, reflection
Paper 200, lamp bar 300, cavity 400.The cavity 400 be backlight module monnolithic case structure, cavity side can be inclined-plane or
Vertical plane, cavity length about 700mm, width about 400mm；The lamp bar 300 is located at cavity bottom surface center, 32 cun of backlight modules
Using only a lamp bar 300, lamp bar 300 is formed by covering copper circuit PCB substrate, CSP light source, asymmetric lens and connector；Institute
Stating 200 bottom surface of reflecting paper has a line aperture, opening diameter 28mm；The installation of diffuser plate 102 can pass through diffuser plate on cavity
The slot and 400 top edge fixed bit of cavity at edge cooperate positioning；The optical diaphragm 101 is mounted on diffuser plate 102,
It can be cooperated by the hangers and 400 top edge fixed bit of cavity of diaphragm edge and be positioned.
The OD value of the embodiment of the present invention is 35mm, i.e. 102 bottom surface of diffuser plate to 400 bottom surface maximum distance 35mm of cavity；
The CSP light source model Seoul WICOP 1313, the pcb board of the lamp bar 300 are to cover copper aluminum substrate, and surface ink is height
Anti- ponding ink, 300 quantity of lamp bar are 1PCS, and the CSP light source and asymmetric lens quantity are 7PCS, and light source spacing
For 95mm, the asymmetric lens outer dimension is 28mmX26.6X8.867mm；200 material of reflecting paper is RA, thickness
0.188mm or 0.255mm；For the diffuser plate 102 with a thickness of 1.0mm, the optical diaphragm 101 is a brightness enhancement film and an expansion
Dissipate film.
As shown in Fig. 2, Fig. 2 is conventional down straight aphototropism mode set light mixing schematic diagram, current routine 32 cun of backlight moulds of straight-down negative
Group uses two lamp bars, and every lamp bar includes 6 LED light sources and TV lens, and the light that LED light source 301 issues is saturating by TV
After mirror diffusion, the hot spot of formation is the circular light spot with rotational symmetry characteristic, and down straight aphototropism mode set and its display device
Generally having length-width ratio is about 4:3 or the elevation of 16:9, and the mismatch of hot spot and outer shape necessarily causes backlight module
Mould group corner and central area brightness it is uneven.Meanwhile in the case where lamp bar quantity is reduced, i.e., lamp bar spacing PY is larger
When, it is relatively low that the mixing of circular light spot also will cause the diffuser plate regional luminance between lamp bar, further decreases brightness uniformity.Therefore
It has to be changed the light mixing principle of conventional down straight aphototropism mode set.
As shown in figure 3, Fig. 3 is 32 cun of backlight module light mixing schematic diagrams that the embodiment of the present invention one provides, when 32 cun of backlights
When mould group only uses a lamp bar, the region that single lamp bar needs to irradiate is 400mmX700mm, and the embodiment of the present invention uses 7PCS light
Source and asymmetric lens, then it is about 400mmX100mm that single CSP light source, which needs the region of projection illumination, the area for needing to illuminate
Domain is too big in X-direction (lamp bar axis direction) and Y-direction (perpendicular to lamp bar axis direction) deviation, the circular light of traditional TV lens
Spot mixing, is unable to satisfy demand；The light that the CSP light source of the embodiment of the present invention issues, after the diffusion of asymmetric lens 500,
Oblong hot spot, vertical 300 axis of lamp bar of elliptical spot long axis are formed, short axle is located on 300 axis of lamp bar, and oval
Shape hot spot long axis length a > 400mm, minor axis length b meet 95 < b < 190.Elliptical spot brightness contour is also ellipse
, elliptical spot short-axis direction partial stack mixing, to complete the uniform mixing of entire backlight module light.
As shown in figure 4, Fig. 4 is the asymmetric lens schematic diagram that the embodiment of the present invention one provides, the asymmetric lens 500
It is made of exit facet 501, the plane of incidence 502, bottom cloudy surface 503, flat surface 505 and suspension column 504, asymmetric lens material PMMA.
The horizontal section of the exit facet 501 is ellipse, and elliptical equation is as follows:az=fa(z)、bz=fb(z),
azRepresent oval semimajor axis length, bzRepresent oval semi-minor axis length, 501 bottom horizontal section of exit facet, az=14mm, bz
=13.3mm.az=fa(z) the length a of horizontal section ellipse semi-major axis and the functional relation of z-axis height, b are representedz=fb(z) generation
The length b of table horizontal section ellipse short shaft and the functional relation of z-axis height, with the increase of height z, fa(z) dull to reduce, fb
(z) dull to reduce.The exit facet of asymmetric lens, top is smooth, does not have any wedge angle, i.e., section and level at the top of exit facet
Face is parallel, smooth top design, is conducive to mold setting, manufacture, while being also conducive to guarantee product quality.It is described such as to penetrate face 502
Horizontal section be ellipse, elliptical equation is as follows:cz=fc(z)、dz=fd(z),czRepresent oval half
Long axis length, dzRepresent oval semi-minor axis length, 502 bottom horizontal section of the plane of incidence, cz=2.8mm, dz=2.15mm, cz
=fc(z) the length c of horizontal section ellipse semi-major axis and the functional relation of z-axis height, d are representedz=fd(z) horizontal section is represented
The length d of oval short long axis and the functional relation of z-axis height, with the increase of height z, fc(z) dull to reduce, fd(z) monotone decreasing
It is small.The bottom cloudy surface 503 has certain cloudy surface class parameter, and when Lighttools design of Simulation, cloudy surface parameter is by complete
Scattering function definition, bright spot of view-field center caused by the decrease phenanthrene alunite of 503 main function of bottom cloudy surface reflects.The bottom platform face
505, it is planar annular between bottom cloudy surface 503 and the plane of incidence 502, circular contour is ellipse, width 0.79mm.Setting
Bottom platform face 505 is avoided generating burr, influences product quality primarily to improve Shooting Technique.
As shown in figure 5, Fig. 5 is asymmetric lens plane of incidence polarisation schematic diagram provided in an embodiment of the present invention, light deflection
Angle is α-α ', and light is deflected to the plane of incidence direction short axle d, and α ' is determined by the law of refraction: sin α=nsin α ', n are PMMA Jie
Matter refractive index.In Lighttools when design of Simulation, plane of incidence minor axis length is adjusted, that is, has adjusted diagram L↓Max ↑ ' it is big
It is small, that is, the size of diagram L ' is had adjusted, so as to adjust the normal direction of light incidence point, and then changes light deflection angle [alpha]-
α ' completes optimizing and revising for hot spot.It is obvious from Fig. 5 it can be concluded that, the transverse that plane of incidence horizontal section is formed is located at lamp bar
When axis direction, light could deflect, so that hot spot be made to form ellipse as design requirement to perpendicular to lamp bar axis direction
The distribution of shape contour.
As shown in fig. 6, Fig. 6 is asymmetric lens exit facet polarisation schematic diagram provided in an embodiment of the present invention, light deflection
Angle beta '-β, light are deflected to the exit facet direction long axis a, and β ' is determined by the law of refraction: nsin β=nsin β ', n are PMMA medium
Refractive index.It is obvious from Fig. 6 it can be concluded that, when the ellipse short shaft that exit facet horizontal section is formed is located at lamp bar axis direction, light
It could continue to deflect to perpendicular to lamp bar axis direction as design requirement, so that hot spot be made to form oval contour point
Cloth.
As shown in fig. 7, Fig. 7 is elliptical spot mesh mapping method provided in an embodiment of the present invention, CSP light source passes through incidence
After the polarisation of face and exit facet, circular light spot and elliptical spot is made to generate mapping corresponding relationship: A → A ', B → B ', C → C ', D
→D',E→E',F→F',G→G'.When asymmetric lens design, first according to design objective, it is big to calculate elliptical spot
It is small, then the method based on the mapping of grid dividing hot spot, reasonable mapping relations are found, according to mapping relations, acquire each mapping point
Polarizing angle, exit facet and the plane of incidence are obtained by polarizing angle and are emitted profile initial value, most has and is finely tuned by Lighttools
Exit facet and the plane of incidence optimize hot spot.
As shown in figure 8, Fig. 8 is 32 cun of backlight module index paths that the embodiment of the present invention one provides, from asymmetric lens 500
The light of outgoing is partially emitted directly toward diffuser plate 102, partially passes through the reflection of 200 side of reflecting paper, in directive diffuser plate 102,
The light of all directive diffuser plates is emitted, using optical diaphragm under the two-way dispersion characteristic of diffuser plate from diffuser plate front
Even light action, to form the planar luminous body of high brightness and uniform luminance.200 side of reflecting paper can have aperture or black silk
Print for absorbing, losing some light, and then adjusts the brightness of backlight module periphery, and then adjusts the uniform of entire backlight module
Property.
As shown in figure 9, Fig. 9 is asymmetric lens light distribution curve provided in an embodiment of the present invention, asymmetric lens are by CSP
After the beam shaping that light source issues, on ellipse light spot short-axis direction, 170 ° of distribution curve flux full-shape >, distribution curve flux brightness peak
Intensity is 50% (brightness curve has normalized)；On perpendicular to light source orientation, 170 ° of distribution curve flux full-shape >, light distribution song
Line brightness peak is 95%, to make the ellipse distribution of ellipse light spot brightness contour.
Embodiment two: as shown in Figure 10, Figure 10 is 43 cun of back light module unit structure schematic diagrames provided by Embodiment 2 of the present invention,
The OD value of 43 cun of backlight modules is 30mm, i.e. 102 bottom surface of diffuser plate to 400 bottom surface maximum distance 35mm of cavity；The CSP light source
Model Seoul WICOP 1313, the pcb board of the lamp bar 300 are to cover copper aluminum substrate, and surface ink is high anti-ponding ink,
300 quantity of lamp bar is 2PCS, and the CSP light source and asymmetric lens quantity are 10PCS, and light source spacing is 85mm, lamp
Stripe pitch is 220mm, and the asymmetric lens outer dimension is 28mmX26.6X8.867mm；200 material of reflecting paper is
RA, thickness 0.188mm or 0.255mm；For the diffuser plate 102 with a thickness of 1.2mm, the optical diaphragm 101 is a brightness enhancement film
With a composite membrane.
It as shown in figure 11, is 43 cun of backlight modules light mixing schematic diagram provided by Embodiment 2 of the present invention, oblong hot spot
Mixing, solves the problems, such as backlight module corner and central area brightness irregularities.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (14)
1. a kind of asymmetric lens, for cooperating with lamp bar (300), which is characterized in that the asymmetric lens include exit facet
(501) and the plane of incidence (502)；The plane of incidence (502) is located in exit facet (501)；
The horizontal section of the exit facet (501) is elliptical shape, arrangement side of the elliptical long axis perpendicular to lamp bar (300) light source
To with the increase of horizontal section height, elliptical long axis and minor axis length monotone decreasing, curvature transition are smooth；The outgoing
The top surface in face (501) is smooth；The horizontal section of the plane of incidence (502) is elliptical shape, the ellipticity of the plane of incidence (502)
The long axis and short axle of horizontal section are plane of incidence long axis and plane of incidence short axle, the ellipticity horizontal section of the exit facet (501)
Long axis and short axle be exit facet long axis and exit facet short axle；The long axis direction of the exit facet (501) and the plane of incidence (502)
Long axis direction is orthogonal, meets simultaneously
The hot spot that CSP light source issues is after exit facet (501) and the plane of incidence (502) shaping, and hot spot is oblong, in lamp bar
(300) in light source orientation, 170 ° of distribution curve flux full-shape >, distribution curve flux brightness peak intensity is I；Perpendicular to light source
In orientation, 170 ° of distribution curve flux full-shape >, distribution curve flux brightness peak > 1.8XI, luminous energy are arranged to perpendicular to lamp bar light source
The offset of cloth direction.
2. asymmetric lens according to claim 1, which is characterized in that the bottom surface long axis length of the exit facet (501)
For 28mm, minor axis length 26.6mm.
3. asymmetric lens according to claim 1, which is characterized in that further include bottom cloudy surface (503) and flat surface
(505)；Bottom cloudy surface (503) is located at the bottom of the plane of incidence (502) and exit facet (501), and the face of the bottom cloudy surface (503) is
Inclined-plane, the flat surface (505) are located between the plane of incidence (502) and bottom cloudy surface (503).
4. a kind of backlight module, which is characterized in that the backlight module includes any asymmetric lens of claim 1-3
(505)。
5. backlight module according to claim 4, which is characterized in that the backlight module further includes cavity (400), reflection
Paper (200), diffuser plate (102) and optical diaphragm (101)；The lamp bar (300), reflecting paper (200) and diffuser plate (102) are under
It up arranges and is respectively positioned in cavity (400), and the edge at the top of diffuser plate (102) and cavity (400) is cooperatively connected, the light
Diaphragm (101) are learned to be mounted on diffuser plate (102) and cooperate positioning with it.
6. backlight module according to claim 5, which is characterized in that the reflecting paper is made of bottom surface and 4 sides, bottom
Face at least a line aperture, diameter >=asymmetric lens major diameter of the aperture of the reflecting paper；Lamp bar (300) assembly
After the completion, from top to bottom, reflecting paper aperture covered asymmetric lens (500), and the bottom surface of cavity (400) is fixed on double-sided adhesive
On, reflecting paper (200) side is fixed by the top surface of cavity (400).
7. backlight module according to claim 6, which is characterized in that when reflecting paper has the above aperture of two rows, line-spacing (lamp
Stripe pitch) >=1.8X light source spacing.
8. backlight module according to claim 5, which is characterized in that the lamp bar includes covering copper circuit PCB substrate, CSP
Light source, asymmetric lens and connector, the copper circuit PCB substrate of covering is for welding CSP light source and fixed asymmetric lens；Institute
It states CSP light source and asymmetric lens pairing occurs；Described covering in copper circuit PCB substrate has several around every CSP light source
There are several non-rotational symmetry mounting posts corresponding with fixed glue groove in fixed glue groove, the asymmetric lens bottom surface.
9. backlight module according to claim 5, which is characterized in that the diffuser plate with a thickness of 1.0mm-1.5mm, institute
Diffuser plate is stated to be fixed on cavity top surface by diffuser plate edge card slot.
10. backlight module according to claim 5, which is characterized in that the material of the optical diaphragm is brightness enhancement film, expands
Dissipate film or composite membrane.
11. according to any backlight module of claim 5-10, it is characterised in that: the backlight module is 28 cun to 32
Very little, lamp bar quantity is 1, and is located at cavity bottom center.
12. according to any backlight module of claim 6-10, it is characterised in that: the backlight module is 40 cun to 43
Very little, lamp bar quantity is 2.
13. according to any backlight module of claim 6-10, it is characterised in that: the backlight module is 55 cun to 60
Very little, lamp bar quantity is 3.
14. according to any backlight module of claim 6-10, it is characterised in that: the backlight module is 70 cun to 80
Very little, lamp bar quantity is 4.
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| CN201710060474.9A CN106842703B (en) | 2017-01-25 | 2017-01-25 | A kind of asymmetric lens and its backlight module |
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| CN106842703B true CN106842703B (en) | 2019-11-15 |
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| CN112394570A (en) * | 2019-08-19 | 2021-02-23 | 海信视像科技股份有限公司 | Display device |
| CN115681880A (en) * | 2022-11-07 | 2023-02-03 | 安徽芯瑞达科技股份有限公司 | Direct-lit single light strip TV backlight |
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| CN106842703A (en) | 2017-06-13 |
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