CN110262129A - A kind of backlight module and its liquid crystal display of application - Google Patents
A kind of backlight module and its liquid crystal display of application Download PDFInfo
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- CN110262129A CN110262129A CN201910530814.9A CN201910530814A CN110262129A CN 110262129 A CN110262129 A CN 110262129A CN 201910530814 A CN201910530814 A CN 201910530814A CN 110262129 A CN110262129 A CN 110262129A
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- backlight module
- optical element
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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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- Nonlinear Science (AREA)
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
The present invention proposes the liquid crystal display of a kind of backlight module and its application, and the backlight module includes: backboard；An at least light source is arranged on the backboard；An at least diffraction optical element is arranged above the light source；An at least optical grating element is arranged above the diffraction optical element；Wherein, on the same line, the optical grating element is used to expand the hot spot of the diffraction optical element transmitting to the central axis of the light source, diffraction optical element and optical grating element.Back light module unit structure proposed by the present invention is simple, and volume is light and handy, and color saturation is high.
Description
Technical field
The present invention relates to technical field of liquid crystal display, in particular to the liquid crystal display of a kind of backlight module and its application.
Background technique
Liquid crystal display has become the mainstream technology of FPD.Liquid crystal itself does not shine, and backlight module is needed to provide light
Line illuminates display area.The brightness of backlight module, uniformity, colour gamut have very big shadow for the optical property of terminal display
It rings.
The backlight module of liquid crystal display generallys use light emitting diode (Light emitting currently on the market
Diode, LED) it is used as back light, since LED light spectrum is continuous spectrum, red (Red, R), green (Green, G), indigo plant (Blue, B) three
Primary colours are generated by the RGB filter in liquid crystal display panel, cause three primary colours light saturation degree not high, colour gamut is limited.In order to expand
Big colour gamut, enriches the visual experience of people, laser diode due to its monochromaticjty is good, color saturation is high and by as a kind of new
Type back light is introduced into liquid crystal display.
Since the hot spot that laser diode issues is the lesser lambert's spot of area ratio, it is carried out using diffraction optical element
When shaping is even smooth, the rectangular light spot of formation is limited by the angle of diffraction, can not form biggish face apart from interior in shorter diffraction
Product, therefore lead to laser backlight mould group higher cost, it is bulky.
Summary of the invention
In view of the defect of the above-mentioned prior art, the present invention proposes the liquid crystal display of a kind of backlight module and its application, with
The volume for reducing backlight module, reduces the cost of backlight module.
To achieve the above object or other purposes, the present invention propose a kind of backlight module, comprising:
Backboard；
An at least light source is arranged on the backboard；
An at least diffraction optical element is arranged above the light source；
An at least optical grating element is arranged above the diffraction optical element；
Wherein, the central axis of the light source, diffraction optical element and optical grating element on the same line, the grating unit
Part is used to expand the hot spot of the diffraction optical element transmitting.
In one embodiment, the quantity of the light source, diffraction optical element and optical grating element is equal, the diffraction optics member
Part collimates the light of the light source transmitting and the collimated elliptical spot is shaped to the rectangular light of larger area
Spot.
In one embodiment, the optical grating element includes first phase distribution and second phase distribution.
In one embodiment, the first phase that the rectangular light spot of the diffraction optical element transmitting passes through the optical grating element
After distribution, the rectangular light spot dimension enlargement is 2 × W by the first phase distribution of the optical grating elementDOE-max×LDOE-max,
WDOE-max×LDOE-maxIndicate the maximum spot size of the diffraction optical element output.
In one embodiment, the hot spot of the optical grating element first phase distribution output passes through the second of the optical grating element
After phase distribution, the spot size of the second phase distribution output of the optical grating element is 2 × WDOE-max×2×LDOE-max。
In one embodiment, the angle of diffraction of the first phase distribution of the optical grating element
WDOE-outputIndicate the rectangular light spot of the single diffraction optical element output
Long axis,
dDOE-BLUIndicate diffraction optical element to the distance for exporting area source.
In one embodiment, the angle of diffraction of the second phase distribution of the optical grating element
LDOE-outputIndicate the short of the rectangular light spot of the single diffraction optical element output
Axis,
dDOE-BLUIndicate diffraction optical element to the distance for exporting area source.
In one embodiment, the light source includes laser diode, when the light source includes a laser diode
When, the rectangular light spot is expanded as the size of the backlight module by the optical grating element.
In one embodiment, when the backlight module includes the identical laser diode of M × N number of wavelength, individually
The light shaping of the single laser diode transmitting is enlarged into the ruler of the laser backlight mould group by the diffraction optical element
The single rectangular light spot is expanded as 1/ (M of the size of the backlight module by 1/ very little (4 × M × N), single optical grating element
×N)；The single diffraction optics when the backlight module includes M × N group luminescence unit, in luminescence unit described in every group
Element by the light shaping of the single laser diode transmitting be enlarged into the laser backlight mould group size 1/ (4 × M ×
N), the single rectangular light spot is expanded as 1/ (M × N) of the size of the backlight module by single optical grating element.
The present invention also proposes a kind of liquid crystal display, comprising:
Liquid crystal display panel；
Backlight module, the liquid crystal display panel are arranged in above the opposite position of the backlight module, the backlight module packet
It includes:
Backboard；
An at least light source is arranged on the backboard；
An at least diffraction optical element is arranged above the light source；
An at least optical grating element is arranged above the diffraction optical element；
Wherein, the central axis of the light source, diffraction optical element and optical grating element on the same line, the grating unit
Part is used to expand the hot spot of the diffraction optical element transmitting.
The present invention proposes the liquid crystal display of a kind of backlight module and its application, expands diffraction pattern by optical grating element
Area, effectively reduce the quantity of light source, while reducing the volume of backlight module, improve backlight module heat dissipation effect
Fruit has saved cost.
Detailed description of the invention
A kind of Figure 1A: backlight module that the present embodiment proposes.
Output area source in Figure 1B: Figure 1A.
The structural schematic diagram of optical grating element in Fig. 1 C: Figure 1A.
Fig. 1 D: the angle of diffraction schematic diagram of optical grating element.
A kind of Fig. 2A: backlight module that the present embodiment proposes.
The setting figure of light source in Fig. 2 B: Fig. 2A.
The setting figure of diffraction optical element in Fig. 2 C: Fig. 2A.
The setting figure of optical grating element in Fig. 2 D: Fig. 2A.
Fig. 2 E: the single optical grating element rectangular light spot formed and the monochromatic area source of synthesis.
Fig. 2 F: the horizontal divergence angle of laser diode and vertical divergence angle schematic diagram.
Fig. 2 G: diffraction optical element to output area source is apart from schematic diagram.
A kind of Fig. 3 A: backlight module that the present embodiment proposes.
The setting figure of light source in B: Fig. 3 A of Fig. 3.
The setting figure of diffraction optical element in C: Fig. 3 A of Fig. 3.
The setting figure of optical grating element in D: Fig. 3 A of Fig. 3.
Fig. 3 E: the single optical grating element rectangular light spot formed and the white area source of synthesis.
Fig. 3 F: the back light module unit structure schematic diagram including two luminescence units that the present embodiment proposes.
A kind of Fig. 4: liquid crystal display that the present embodiment proposes.
Symbol description
10 backlight modules
20 liquid crystal displays
100 backboards
101 substrates
102 back plate frames
200 light sources
210 red laser diodes
211 blue laser diodes
212 green laser diodes
300,310,311,312 diffraction optical elements
400,410,411,412 optical grating elements
The first phase of 401 optical grating elements is distributed
The second phase of 402 optical grating elements is distributed
500 output area sources
510,511,512 rectangular light spots
600 liquid crystal display panels
The wavelength of the light of λ laser diode transmitting
The horizontal divergence angle of α laser diode
The vertical divergence angle of β laser diode
The angle of diffraction of the first phase distribution of γ optical grating element
The angle of diffraction of the second phase distribution of optical grating element
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
It should be noted that the basic conception that only the invention is illustrated in a schematic way is illustrated provided in the present embodiment,
Then only shown in schema with it is of the invention in related component rather than component count, shape and size when according to actual implementation draw
System, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout kenel can also
It can be increasingly complex.
Figure 1A is please referred to, the present embodiment proposes a kind of backlight module 10, comprising: backboard 100, at least a light source 200, at least
One diffraction optical element 300, at least an optical grating element 400.
Figure 1A is please referred to, the backboard 100 includes a substrate 101 and at least four back plate frames 102.The substrate 101
It can individually be formed with the back plate frame 102, the material of the substrate 101 and the back plate frame 102 may be, for example, gold
Category or plastic cement.The substrate 101 is vertical with the back plate frame 102 fixed, in the present embodiment, the substrate 101 with it is described
Backboard 102 can be engaged by screw, and the other methods such as welding are fixed.It in other embodiments, can be in the outer of the backboard 100
One layer of heat radiation coating is coated on surface, the heat radiation coating of the outer surface coating of the backboard 100 is for improving the backboard 100
The radiating efficiency on surface, the heat radiation coating may be, for example, boron nitride ceramics paint, aluminium nitride ceramics paint or aluminium oxide ceramics paint.
Due to coating heat radiation coating in 100 outer surface of backboard, backlight can be made directly to pass through the backboard 100 and radiated, therefore
Without using radiator, to reduce costs, and the assembling procedure of laser backlight mould group is simplified.
Please refer to Figure 1A, in the present embodiment, the backlight module 10 includes a light source 200, and the light source 200 is set
It sets on the substrate 101, includes printed circuit board (not shown) on the substrate 101, the light source 200 is packaged in institute
It states on the printed circuit board on backboard 100, for the light source 200 as back light, the light source 200 is (ellipse for emitting light
Circular light spot).The horizontal divergence angle for the light that the light source 200 emits is at 20-30 °, such as at 25 °, in another example hanging down at 27 °
The straight angle of divergence is at 10-20 °, such as at 12 °, in another example at 16 °.The light size that the light source 200 emits is probably in several millis
Rice, such as at 5,6 millimeters.In other embodiments, the light source 200 is arranged on a pedestal, and the pedestal is mounted on described
On substrate 101, the pedestal is used to connect the circuit board on the substrate 101.In the present embodiment, the light source 200 is for example
For laser diode.
Figure 1A is please referred to, in the present embodiment, the backlight module 10 includes a diffraction optical element 300, institute
It states diffraction optical element 300 to be arranged above the light source 200, the center of the diffraction optical element 300 and the light source 200
Line is located along the same line, and the diffraction optical element 300 collimates the light (elliptical spot) that the light source 200 emits, and
The collimated elliptical spot is shaped to the rectangular light spot of larger area, improves delivery efficiency.
Figure 1A -1C is please referred to, in the present embodiment, the backlight module 10 includes an optical grating element 400, described
Optical grating element 400 be close to be arranged on the diffraction optical element 300, the light source 200, the diffraction optical element 300 and
The centerline of the optical grating element 400 is on same straight line, and the optical grating element 400 is for expanding the diffraction optical element
The hot spot of 300 transmittings, the hot spot that the light source 200 emits form the rectangular light of larger area through the diffraction optical element 300
Spot, the rectangular light spot can form greater area of rectangular light spot in output face after the optical grating element 400 expansion.In this reality
It applies in example, the optical grating element 400 includes that first phase is distributed 401 and second phase distribution 402, in the present embodiment, described
After rectangular light spot passes through the first phase distribution 401 of the optical grating element, the first phase distribution 401 of the optical grating element can be incited somebody to action
The rectangular light spot dimension enlargement is 2 × WDOE-max×LDOE-max, WDOE-max×LDOE-maxIndicate the diffraction optical element output
Maximum spot size, the hot spot after the first phase of optical grating element distribution 401 pass through the optical grating element the
After two-phase bit distribution 402, the spot size of 402 output of second phase distribution of the optical grating element is 2 × WDOE-max×2×
LDOE-max.In the present embodiment, the hot spot that the optical grating element 400 forms the diffraction optical element 300 expands 4 times, has
Effect, which is solved, forms biggish area under shorter diffraction distance, reduces the volume of backlight module.In the present embodiment, institute
Stating optical grating element 400 is, for example, diffraction grating.
Fig. 1 D is please referred to, in the present embodiment, the angle of diffraction of the first phase distribution 401 of the optical grating element
WDOE-outputIndicate the rectangular light spot of the single diffraction optical element output
Long axis, dDOE-BLUIndicate diffraction optical element to the distance for exporting area source (Backlight Unit, BLU).
The angle of diffraction of the second phase distribution 402 of the optical grating element
LDOE-outputIndicate the short of the rectangular light spot of the single diffraction optical element output
Axis, dDOE-BLUDistance of the expression diffraction optical element to output light source.
Figure 1A -1C is please referred to, in the present embodiment, the backlight module 10 includes a light source 200, diffraction optics
Element 300 and optical grating element 400, the hot spot that the light source 200 emits form rectangular light by the diffraction optical element 300
The rectangular light spot is expanded as the size of the backlight module 10 by spot, the optical grating element 400.
Fig. 2A is please referred to, the present embodiment proposes a kind of laser backlight mould group 10, comprising: backboard 100, two pole of an at least laser
Pipe 200, at least a diffraction optical element 300, at least an optical grating element 400.
Fig. 2A -2B is please referred to, in the present embodiment, the backlight module 10 includes nine light sources 200, the light source
200 are arranged on the substrate 101, and in the present embodiment, nine light sources 200 are fixed on the substrate according to 3 × 3 arrays
On 101, the two neighboring light source 200 has certain spacing.In other embodiments, nine light sources 200 can be according to
Other modes are fixed on the substrate 101.In the present embodiment, the light source 200 is one-wavelength laser diode.
Fig. 2A, 2C are please referred to, in the present embodiment, the backlight module 10 includes nine diffraction optical elements 300,
The diffraction optical element 300 alignment is arranged above the laser diode 200, the diffraction optical element 300 and described
For the centerline of laser diode 200 on same straight line, the diffraction optical element 300 collimates the laser diode 200
The light (elliptical spot) of transmitting and the collimated elliptical spot is shaped to rectangular light spot, spread out by described
The rectangular light spot size of the formation of optical element 300 is penetrated about at several centimetres, such as at 4-8 millimeters, in another example at 5-6 millimeters.
In the present embodiment, the wavelength of nine light sources 200 is the same, and the diffraction surfaces of nine diffraction optical elements 300 are identical,
It is exactly that the phase distribution matrix of nine diffraction optical elements 300 is identical.
Fig. 2A -2E is please referred to, in the present embodiment, the backlight module 10 includes nine optical grating elements 400, described
The alignment of optical grating element 400 is arranged on the diffraction optical element 300, the light source 200, diffraction optical element 300 and described
The centerline of optical grating element 400 is on same straight line.It in the present embodiment, is laser diode progress with the light source 200
Illustrate, the hot spot of the single laser diode transmitting forms the rectangular light of certain area by the diffraction optical element 300
Spot (1/ (4 × 9) of the size of backlight module 10), in the present embodiment, the backlight module 10 include nine laser two
Pole pipe, the diffraction optical element 300 form nine rectangular light spots, and the size of nine matrix hot spots is identical, at this
In embodiment, the rectangular light spot forms greater area of rectangular light spot 501 by the optical grating element 400, the single square
The size of battle array hot spot 501 is equal to the 1/9 of the size of the backlight module 10, nine matrix hot spots shape after mixing superposition
At the area source 500 of larger area, the size of the area source 500 is equal to the size of the backlight module 10.
Fig. 2A -2G is please referred to, in the present embodiment, the backlight module 10 includes such as nine light sources 200, described
Light source 200 is the laser diode (wavelength λ) of Same Wavelength, is illustrated below to the design method of Unicolor back light mould group:
1, the area source (lighting area) 500 for setting the backlight module 10 is WBLU×LBLU(mm), diffraction optics is set
The distance between element 300 and area source 500 are dDOE-BLU(mm)；
2, the maximum light source area for calculating 300 shaping of diffraction optical element output, is denoted as WDOE-max×LDOE-max(mm), exist
In the present embodiment,
PixelDOE-x(μm) indicates the minimum precision of diffraction optical element in the horizontal direction, PixelDOE-y(μm) indicates
The minimum precision of diffraction optical element in vertical direction；
3, hot spot of the hot spot that diffraction optical element 300 exports by 401 output of first phase distribution of optical grating element 400
Area is 2 × WDOE-max×LDOE-max(mm), the facula area by 402 output of second phase distribution of optical grating element 400 is 2
×WDOE-max×2×LDOE-max(mm)；
4, the quantity for calculating the laser diode needed, is denoted as MLD×NLD, wherein MLDIt is WBLUDivided by (2 × WDOE-max)
To digit integer portion add 1, NLDIt is LBLUDivided by (2 × LDOE-max) obtained digit integer portion adds 1；
5, the quantity for calculating diffraction optical element, is denoted as MDOE×NDOE, wherein MDOE=MLD, NDOE=NLD；
6, the light source area for calculating single diffraction optical element output, is denoted as WDOE-output×LDOE-output(mm),
WhereinWDOE-outputIndicate single diffraction optical element shaping
The long axis of the rectangular light spot of output, LDOE-outputIndicate the short axle of the rectangular light spot of single diffraction optical element shaping output；
7, the area for calculating the single diffraction optical element 300, is expressed as WDOE×LDOE
Wherein,
WDOEIndicate the long axis of diffraction optical element, LDOEIndicate the short axle of diffraction optical element, α indicates laser diode
Horizontal divergence angle, β indicate the vertical divergence angle of laser diode, dLD-DOEIndicate laser diode to diffraction optical element 300
Distance；
8, it brings the wavelength X of laser diode into lid Shi Beige-saxophone and leads to algorithm, Shi Beige-saxophone is logical according to lid
The phase distribution of algorithm calculating diffraction optical element；
9, Fig. 1 D is please referred to, the angle of diffraction of the first phase distribution 401 of the optical grating element 400 is
The optical grating element 400 second phase distribution 402 the angle of diffraction be
10, in embodiment, by laser diode, diffraction optical element and optical grating element alignment setting.
Fig. 3 A is please referred to, the present embodiment proposes a kind of backlight module 10, comprising: backboard 100, at least a light source, at least one
Diffraction optical element, at least an optical grating element.
Fig. 3 A-3B is please referred to, in the present embodiment, the backlight module 10 includes three light sources, and three light sources are
Red laser diode 210, blue laser diode 211 and green laser diode 212, the red laser diode 210,
Blue laser diode 211 and green laser diode 212 can be described red according to being mounted on the substrate 101 shown in Fig. 3 B
Color laser diode 210 is 635 nanometers for emitting red light, the wavelength for the light that the red laser diode 210 emits,
The blue laser diode 211 is used to emit blue ray, and the wavelength for the light that the blue laser diode 211 emits is
470 nanometers, the green laser diode 212 is used to emit green light, the light that the green laser diode 212 emits
Wavelength is 535 nanometers.In other embodiments, the light source may also include yellow or the laser diode of other colors.At it
In his embodiment, the light source can be mounted on otherwise on the substrate 101.
Fig. 3 A-3C is please referred to, in the present embodiment, the diffraction optical element 300 includes diffraction optical element 310, is spread out
Optical element 311 and diffraction optical element 312 are penetrated, the alignment of diffraction optical element 310 is arranged in two pole of red laser
On pipe 210, the alignment of diffraction optical element 311 is arranged in the blue laser diode 211, the diffraction optical element
312 are arranged on the green laser diode 212.Due to the red laser diode 210, blue laser diode 211
And the wavelength that green laser diode 212 emits is different, so the diffraction optical element 310, diffraction optical element 311 and spreads out
The structure for penetrating optical element 312 is different, that is, the diffraction surfaces of the diffraction optical element 310, the diffraction of diffraction optical element 311
The diffraction surfaces in face, diffraction optical element 312 are different, also that is, the phase distribution matrix of the diffraction optical element 310, diffraction light
The phase distribution matrix of element 311 is learned, the phase distribution matrix of diffraction optical element 312 is different.
3A-3E is please referred to, in the present embodiment, the backlight module 10 includes three optical grating elements, for example, grating unit
Part 410, optical grating element 411 and optical grating element 412, the alignment of optical grating element 410 are close to be arranged in the diffraction optical element
310 top, the alignment of optical grating element 411 are close to that the top of the diffraction optical element 411, the optical grating element is arranged in
412 alignments are close to that the top of the diffraction optical element 412 is arranged in, and are lifted by taking red laser diode 210 as an example below
Example explanation:
1, the transmitting of red light emitting diodes 210 light (elliptical spot) is formed larger through diffraction optical element 310
The red rectangle hot spot (a quarter of the size of output area source 500) of area；
2, the red rectangle hot spot forms greater area of red rectangle hot spot 510 by optical grating element 410, described red
Color rectangular light spot 510 is equal to the size of backlight module output area source 500.
Similarly it is found that the red rectangle hot spot 510, blue rectangle hot spot 511, the size phase of green rectangular light spot 512
Deng.
Fig. 3 F is please referred to, in the present embodiment, the backlight module 10 includes two groups of luminescence units, is shone described in every group single
Member includes that (red laser diode 210, blue laser diode 211, green swash the different laser diode 200 of three wavelength
Optical diode 212), the laser diode 200 in every group of luminescence unit according to laser diode 200 described in Fig. 3 B battle array
Column mode is arranged, and the red light emitting diodes 210 emit light (elliptical spot) and formed through diffraction optical element 310
The red rectangle hot spot (1/8th of the size of output area source 500) of certain area, the diffraction optical element 310 emits
The rectangular light spot area that emits after described 410 of rectangular light spot be size that the backlight module exports area source 500
Half.It is overlapped by the rectangular light spot of luminescence unit described in two groups, forms greater area of hot spot, thus expand
The lighting area of the backlight module 10.In other embodiments, the backlight module 10 may also include three groups, send out described in four groups
Light unit, it is so without being limited thereto.In the present embodiment, the luminescence unit includes different two pole of the laser of three wavelength,
In other embodiments, the luminescence unit can be for example including two, four, the different laser diode of five wavelength, so
It is without being limited thereto.
Referring to Fig. 4, the present embodiment proposes that a kind of liquid crystal display 20, the liquid crystal display 20 include liquid crystal display panel
600, backlight module 10, the liquid crystal display panel 600 is oppositely arranged on the backlight module 10.The backlight module 10 is to described
Liquid crystal display panel 600 provides display light source and the liquid crystal display panel 600 is made to show image.
Referring to Fig. 4, the backlight module 10 includes backboard 100, light source 200, diffraction optical element 300 and optical grating element
400.The light source 200 is located on the backboard 100, and the diffraction optical element 300 is located on the light source 200, the light
Grid element 400 is located on the diffraction optical element 300.The light source 200, the diffraction optical element 300 and the grating
For the centerline of element 400 on same straight line, the optical grating element 400 expands the light that the diffraction optical element 300 emits
Spot, the light source 200 are, for example, laser diode.
In conclusion the present invention proposes a kind of backlight module, the light for being emitted laser diode by diffraction optical element
Line carries out expanding even light, can form the area source of certain area, brightness uniformity in narrow volume, then pass through grating unit
Part further expansion facula area, forms greater area of area source, effectively reduces the quantity of light source, improves heat dissipation effect
Fruit reduces costs.Back light module unit structure proposed by the present invention is simple, and cost is relatively low, and color saturation is high.The present invention also proposes
A kind of liquid crystal display.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle, those skilled in the art
Member is it should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
Any combination and the other technical solutions formed, such as features described above have similar function with (but being not limited to) disclosed herein
Can technical characteristic replaced mutually and the technical solution that is formed.
Except for the technical features described in the specification, remaining technical characteristic is the known technology of those skilled in the art, is prominent
Innovative characteristics of the invention out, details are not described herein for remaining technical characteristic.
Claims (10)
1. a kind of backlight module characterized by comprising
Backboard；
An at least light source is arranged on the backboard；
An at least diffraction optical element is arranged above the light source；
An at least optical grating element is arranged above the diffraction optical element；
Wherein, the central axis of the light source, diffraction optical element and optical grating element on the same line, use by the optical grating element
In the hot spot for expanding the diffraction optical element transmitting.
2. backlight module according to claim 1, it is characterised in that: the light source, diffraction optical element and optical grating element
Quantity it is equal, the diffraction optical element collimates the light of light source transmitting and by the collimated ellipse-shaped light
Spot is shaped to the rectangular light spot of larger area.
3. backlight module according to claim 1, it is characterised in that: the optical grating element includes first phase distribution and the
Two-phase bit distribution.
4. backlight module according to claim 2 or 3, it is characterised in that: the rectangular light spot passes through the optical grating element
First phase distribution after, the rectangular light spot dimension enlargement is 2 × W by the distribution of the first phase of the optical grating elementDOE-max
×LDOE-max, WDOE-max×LDOE-maxIndicate the maximum spot size of the diffraction optical element output.
5. backlight module according to claim 4, it is characterised in that: the first phase distribution output of the optical grating element
Hot spot is after the distribution of the second phase of the optical grating element, the spot size of the second phase distribution output of the optical grating element
For 2 × WDOE-max×2×LDOE-max。
6. backlight module according to claim 3, it is characterised in that: the diffraction of the first phase distribution of the optical grating element
Angle
WDOE-outputIndicate the long axis of the rectangular light spot of the single diffraction optical element output,
dDOE-BLUIndicate diffraction optical element to the distance for exporting area source.
7. backlight module according to claim 3, it is characterised in that: the diffraction of the second phase distribution of the optical grating element
Angle
LDOE-outputIndicate the short axle of the rectangular light spot of the single diffraction optical element output.
8. backlight module according to claim 2, it is characterised in that: the light source includes laser diode, when the light
When source includes a laser diode, the optical grating element expands as the rectangular light spot that the diffraction optical element emits
The size of the backlight module.
9. the backlight module according to claim 2 or 8, it is characterised in that: when the backlight module includes M × N number of wavelength
When the identical laser diode, the single diffraction optical element is by the light shaping of the single laser diode transmitting
It is enlarged into 1/ (4 × M × N) of the size of the laser backlight mould group, the single optical grating element will the single rectangular light spot
Expand as 1/ (M × N) of the size of the backlight module；When the backlight module includes M × N group luminescence unit, every group of institute
The light shaping of the single laser diode transmitting is enlarged into institute by the single diffraction optical element stated in luminescence unit
1/ (4 × M × N) of the size of laser backlight mould group is stated, the single rectangular light spot is expanded as institute by the single optical grating element
State 1/ (M × N) of the size of backlight module.
10. a kind of liquid crystal display characterized by comprising
Liquid crystal display panel；
Backlight module, the liquid crystal display panel are arranged in above the opposite position of the backlight module, and the backlight module includes:
Backboard；
An at least light source is arranged on the backboard；
An at least diffraction optical element is arranged above the light source；
An at least optical grating element is arranged above the diffraction optical element；
Wherein, the central axis of the light source, diffraction optical element and optical grating element on the same line, use by the optical grating element
In the hot spot for expanding the diffraction optical element transmitting.
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| CN201910530814.9A CN110262129B (en) | 2019-06-19 | 2019-06-19 | Backlight module and liquid crystal display using same |
| PCT/CN2019/117843 WO2020207012A1 (en) | 2019-04-11 | 2019-11-13 | Backlight module, liquid crystal display device and electronic device |
| US17/271,923 US11733562B2 (en) | 2019-04-11 | 2019-11-13 | Backlight module comprising a diffractive optical element configured to shape a collimated elliptical spot into a rectangular spot with a larger area |
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| WO2020207012A1 (en) * | 2019-04-11 | 2020-10-15 | 合肥工业大学 | Backlight module, liquid crystal display device and electronic device |
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| US11733562B2 (en) | 2019-04-11 | 2023-08-22 | Hefei University Of Technology | Backlight module comprising a diffractive optical element configured to shape a collimated elliptical spot into a rectangular spot with a larger area |
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| CN110262129B (en) | 2022-11-11 |
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