CN112241084A - Thin liquid crystal display backlight illuminating system with directivity - Google Patents
Thin liquid crystal display backlight illuminating system with directivity Download PDFInfo
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- CN112241084A CN112241084A CN201910651430.2A CN201910651430A CN112241084A CN 112241084 A CN112241084 A CN 112241084A CN 201910651430 A CN201910651430 A CN 201910651430A CN 112241084 A CN112241084 A CN 112241084A
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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
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a backlight illumination system of a thin liquid crystal display with directivity, which comprises a base, a circuit board, a condensing lens group and an array lens, wherein an accommodating space is arranged in the base, the circuit board is arranged at the bottom of the accommodating space of the base, a plurality of luminous bodies are arranged on the circuit board, the condensing lens group is arranged in the accommodating space and is positioned above the circuit board, the condensing lens group comprises a plurality of condensing lenses, each condensing lens is arranged corresponding to each luminous body, the array lens is arranged at the top of the accommodating space of the base and is positioned above the condensing lens group, the array lens comprises a plurality of Fresnel lens units, each Fresnel lens unit is arranged corresponding to each condensing lens, and the section sawtooth height of each Fresnel lens unit is less than 50 micrometers; the backlight illumination system can realize the backlight effect with high brightness and uniform brightness, omits the commonly used light guide column and diffusion sheet structure, and has the advantages of less light loss, higher brightness, cost saving and thinner thickness.
Description
Technical Field
The invention relates to the technical field of backlight illumination systems, in particular to a directional thin liquid crystal display backlight illumination system.
Background
Common liquid crystal displays, such as mobile phones, flat panels, televisions, etc., have a backlight system, which is mostly light-emitting sources that pass through structures such as a light guide plate and a diffusion sheet, so as to form a light source with a uniform surface and a light direction diffusion, and then transmit images through the liquid crystal display in front, and the backlight system has the advantages that: the user can see the image content of the liquid crystal display clearly at different angles, but the defect is that the direction of the illuminating light is too dispersed, and the brightness is insufficient and the image cannot be seen clearly under the bright outdoor environment; at this time, the brightness must be increased, which causes problems such as increased power consumption and difficulty in heat dissipation.
However, in some specific virtual image system applications, such as a head-up display, a virtual reality system, an augmented reality system, or a real image device such as a projector, a backlight illumination system of a liquid crystal display is adopted, and the light source is required to be uniform and concentrated in a specific angle range, so that the waste of the light source can be reduced, sufficient brightness is provided, the power consumption is reduced, the heat dissipation requirement is reduced, and the reliability of the system is improved.
As shown in fig. 11 and 12, the backlight system for a head-up display includes a plurality of light sources 80, a light guide 81 and a diffusion sheet 82, wherein the plurality of light sources 80 are installed at the lower end of the light guide 81, the diffusion sheet 82 is installed at the upper end of the light guide 81, such that the lower end of the light guide 81 forms a light incident surface, the upper end of the light guide 81 forms a light emergent surface, each light source 80 is formed by a light-emitting diode 802 covering a light-collecting cup 801, and after the light source is emitted from the light-emitting diode 802, the light is emitted outward through the light-collecting cup 801, the light guide 81 is used for accommodating the light emitted from the plurality of light sources 80, and the light guide 81 is a hollow cylinder with high reflectivity on four sides, when the light from the plurality of light sources 80 is condensed by the light-collecting cups 801 and then emitted into the light guide 81 from the lower end of the light guide 81, the light is mixed in the light guide 81, the light emitted from the upper end of the light guide column 81 passes through the diffusion sheet 82, the diffusion sheet 82 diffuses the mixed light to a proper angle to form a uniform surface light source, which is used as the backlight source of the rear LCD panel 83; however, the brightness of the backlight illumination system is not uniform near the light-emitting surface of the light-collecting cup 801, and gaps exist among the light-collecting cups 801, so that shadows appear, and the light guide column 81 is needed to be added to keep the position of the liquid crystal display away, so that the illumination light is uniform, in addition, the higher the height of the light guide column 81 is, the more uniform the illumination light distribution is, but the too high light guide column 81 increases the thickness of the backlight illumination system, so that the volume of the illumination system is too large, and the practicability of the illumination system is lost; also, the diffusion sheet 82 has angular spread, and it is difficult to concentrate the illumination light in a visible range of a specific angle, resulting in a waste of brightness.
As shown in fig. 13, a condensing lens group 70 and a lens array 71 are mainly disposed in front of a plurality of LED light sources 73, the condensing lens group 70 includes a plurality of condensing lenses respectively disposed in front of the LED light sources 73; the lens array 71 is composed of a plurality of lenses. The illumination design can form an ideal illumination light source with uniform and moderate diffusion angle on the light-emitting surface (i.e. the surface of the lens array), so as to achieve the purpose of no need of a light guide column and reduce the thickness of the system, but in the actual production process, due to the limitation of the mold and the manufacturing process, the connection between each lens on the lens array 71 generates an arc-shaped joint section 710 due to the height difference of the lens, when the light is projected in the area, the light is diffused to generate a shadow, thereby causing the phenomenon of local non-uniform brightness, and when the lens array 71 is more formed, the unit shadows 722 formed in the unit light areas 721 can be connected with each other, so that the longer the shadows appear in the lengths L1 and L2 of the light projection light area 72, the more the defect of obvious non-uniform brightness is caused, and the structure is difficult to break through.
The conventional backlight illumination system has the disadvantages of incomplete design, large volume, large brightness loss, non-uniform brightness, high cost and the like, and is inconvenient to use in occasions with limited space, such as a head-up display of an automobile.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned disadvantages and providing a backlight illumination system for a thin liquid crystal display with thin thickness, high brightness, less light loss, low cost and directionality.
In order to achieve the purpose, the invention adopts the following specific scheme:
the utility model provides a slim LCD backlight lighting system with directionality, includes base, circuit board, condenser lens group and array lens, be equipped with the accommodation space in the base, the bottom of the accommodation space of base is located to the circuit board, be equipped with a plurality of luminous bodies on the circuit board, condenser lens group locates in the accommodation space and is located the top of circuit board, condenser lens group includes a plurality of condenser lens, wherein every condenser lens corresponds every the luminous body sets up, array lens locates the top of the accommodation space of base and is located condenser lens group's top, array lens includes a plurality of fresnel lens units, wherein every fresnel lens unit corresponds every condenser lens sets up, just the sawtooth height of fresnel lens unit section is less than 50 microns.
Wherein, a plurality of said luminophors are all wrapped up by the condensing lens separately.
The condensing lens is made of a silica gel material.
The Fresnel lens units are regular hexagons in shape, and a plurality of Fresnel lens units are arranged in a honeycomb shape.
The Fresnel lens units are rectangular in shape, and the Fresnel lens units are arranged in a matrix or staggered mode.
And the Fresnel lens unit is provided with a circularly symmetrical sawtooth structure.
The liquid crystal display is positioned above the array lens and used for receiving light rays transmitted by the array lens.
Wherein an assistant lens is arranged between the liquid crystal display and the array lens.
Wherein the assisting lens is a Fresnel lens.
Wherein, the luminous body is a white light emitting diode.
The invention has the beneficial effects that:
the Fresnel lens unit with the sawtooth height of the section smaller than 50 microns is used for forming the array lens, after the light sources of the luminous body and the condensing lens are received, the backlight effect with high brightness and uniform brightness can be achieved, the common light guide column and diffusion sheet structure is omitted, the light loss is less, the brightness is higher, the cost is saved, the thickness is thinner, and the Fresnel lens unit has the advantages of not occupying space and reducing heat dissipation space;
the Fresnel lens units of the array lens are arranged in a regular hexagon or a rectangle, wherein the array lens formed by arranging the regular hexagon Fresnel lens units in a honeycomb manner can have the advantage of optimal light collecting efficiency; the rectangular Fresnel lens units are arranged in a matrix or staggered array lens mode, so that the Fresnel lens has the advantages of convenience in mold manufacturing and low cost;
the invention can arrange an assistant lens in front of the array lens, which can guide the light source into the aperture range of the rear imaging optical system, so that the light source is not lost and wasted.
Drawings
FIG. 1 is a perspective view of a backlight system for a thin LCD according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a portion of a back lighting system of a thin LCD according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a condenser lens assembly according to an embodiment of the present invention;
fig. 4 is a diagram illustrating a structure of a fresnel lens unit of an array lens according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view taken along A-A of FIG. 4;
FIG. 6 is a schematic structural diagram of a Fresnel lens with a regular hexagonal shape according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an embodiment of the present invention applied to a head-up display;
FIG. 8 is a schematic diagram of an embodiment of the present invention using a rectangular Fresnel lens unit with a staggered arrangement;
FIG. 9 is a schematic diagram of an embodiment of the present invention employing a rectangular Fresnel lens cell matrix arrangement;
FIG. 10 is an exploded cross-sectional view of a back light illumination system for a thin LCD according to an embodiment of the present invention;
FIG. 11 is an exploded view of a prior art backlighting system;
FIG. 12 is a cross-sectional view of a prior art backlighting system;
FIG. 13 is an illustrative schematic diagram of the shadowing problem created using a prior art improved backlighting system;
description of reference numerals: 10-a base; 20-a circuit board; 21-a luminophore; 22-a condenser lens group; 221-a condenser lens; 30-an array lens; 31-a fresnel lens unit; 311-serration; 40-an assisting lens; 41-liquid crystal display; 50-a projected light region; 51-unit optical domain; 60-an optical combiner; 61-visible range; 62-human eye;
70-a condenser lens group; 71-a lens array; 710-a junction region; 72-projected light area; 721-unit light field; 722-cell shading; 73-a LED light emitting source; 80-a light emitting source; 801-light focusing cup; 802-light emitting diode; 81-light guide column; 82-a diffusion sheet; 83-LCD panel.
Detailed Description
The invention will be described in further detail with reference to the following figures and specific examples, without limiting the scope of the invention.
As shown in fig. 1 to 10, the backlight illumination system for a directional thin liquid crystal display according to the present embodiment includes a base 10, a circuit board 20, a condenser lens assembly 22 and an Array lens (Array lens) 30, wherein a receiving space is disposed in the base 10, the circuit board 20 is fixed at the bottom of the receiving space of the base 10, the circuit board 20 is provided with a plurality of light emitters 21, preferably, the light emitters 21 are white light emitting diodes (white light emitting diodes) with high luminance and capable of emitting light forward, the condenser lens assembly 22 is disposed in the receiving space and located above the circuit board 20, the condenser lens assembly 22 includes a plurality of condenser lenses 221, wherein each of the condenser lenses 221 is disposed corresponding to each of the light emitters 21, that is, the condenser lenses 221 are disposed corresponding to the light emitters 21 one to one, the Array lens 30 is disposed at the top of the receiving space of the base 10 and located above the condenser lens assembly 22, the array lens 30 includes a plurality of fresnel lens units 31, wherein each fresnel lens unit 31 is disposed corresponding to each condensing lens 221, and the height of the saw tooth 311 of the cross section of the fresnel lens unit 31 is less than 50 μm.
Specifically, in the present embodiment, the number of the light emitters 21, the condensing lens 221, and the fresnel lens unit 31 may be respectively 16, and 16 light emitters 21 are divided into 3 rows, 6 light emitters 21 are arranged in the middle row, the number of the light emitters 21 in the other two rows is 5, and the condensing lens 221 and the fresnel lens unit 31 are respectively arranged corresponding to the 16 light emitters 21; the number of the light emitter 21, the number of the condenser lens 221, and the number of the fresnel lens unit 31 may also be 32, respectively, as shown in fig. 6; the number of the light emitters 21, the condensing lenses 221, and the fresnel lens units 31 in this embodiment may be set to different numbers and arrangement modes according to actual requirements; in this embodiment, the condensing lens 221 may be a plastic lens, each condensing lens 221 is respectively mounted on the light emitting bodies 21, when in operation, each light emitting body 21 on the circuit board 20 operates to project light to form a light source, the light source first condenses light through the condensing lens group 22, then passes through the array lens 30, is condensed by each fresnel lens unit 31 and homogenizes the light source, only a very small amount of light is dissipated, and after passing through the array lens 30, the light source forms a surface light source with directionality and uniform brightness, so as to form backlight illumination, as shown in fig. 10, a liquid crystal display 41 may be disposed above the array lens 30, and the liquid crystal display 41 may receive the light transmitted by the surface light source, so as to form a backlight illumination system of the liquid crystal display 41.
In order to avoid the shadow problem caused by imperfect joining between the lenses in the array lens 30, the fresnel lens unit 31 is used to form the array lens 30 in the present embodiment, because the fresnel lens unit 31 is a plane sawtooth structure, and the height of the sawtooth 311 of the cross section of the fresnel lens unit 31 is less than 50 μm, the production of such a microstructure is basically a process of coating, exposing, and transfer molding of photosensitive material, and is completely different from the conventional injection molding, so that the problem of arc joining caused by flash during molding due to excessive height difference between the lenses is avoided, the existing mold process can control the splicing gap of each fresnel lens unit 31 within less than one pixel of the liquid crystal display 41, so that the shadow at the joint is difficult to be perceived, therefore, the backlight illumination system structure of the present invention can form a surface light source with directionality and uniform brightness on the surface of the array lens 30 without using light guide columns and diffusion sheets, is one of the advantages of the present invention.
Based on the above embodiments, preferably, as shown in fig. 2, the plurality of light emitters 21 are respectively covered by the condensing lens 221, so that the light emitted by the light emitters 21 completely passes through the condensing lens 221, thereby enhancing the brightness of the light, preferably, the condensing lens 221 is made of a silica gel material, which is beneficial for the condensing lens 221 to completely cover the light emitters 21, so that the light emitters 21 and the condensing lens 221 are completely sealed, thereby achieving better reliability and light emitting efficiency, and the condensing lens group 22 can also be linked to be called an array lens structure, as shown in fig. 3, which is beneficial for mass production in an injection molding manner.
Based on the above embodiment, as shown in fig. 1, fig. 2, fig. 4 and fig. 6, the fresnel lens unit 31 has a regular hexagonal shape, and a plurality of fresnel lens units 31 are arranged in a honeycomb shape; since the white light emitting diode is a small-area lambertian light source, and the light emitting azimuths thereof are in a circular symmetry relationship, as shown in fig. 4, wherein the circular dotted line is the effective light beam range of the white light emitting diode, the regular hexagonal fresnel lens unit 31 can cover most of the light sources, and the regular hexagonal structure is in a seamless dense arrangement mode, so that the light collecting efficiency is optimal; the regular hexagonal Fresnel lens unit 31 is arranged to be closer to the range of a circular light beam emitted by the white light emitting diode, so that the loss of a light source can be further reduced, and the efficiency is improved; in this embodiment, as shown in fig. 5, it is preferable that a circularly symmetric sawtooth 311 structure is disposed on the fresnel lens unit 31, so that the light source brightness is uniformly distributed on the surface of the fresnel lens unit 31, and the thickness of the array lens 30 is further reduced; when the Fresnel lens array is used, light rays projected by the luminous bodies 21 on the circuit board 20 are condensed by the condenser lens group 22, then pass through the array lens 30, are condensed by each Fresnel lens unit 31 and homogenize the light source, and only a few light sources are dissipated, as shown in FIG. 6, so that a strong projection light area 50 consisting of unit light areas 51 of the Fresnel lens units 31 can be projected.
With respect to the regular hexagonal fresnel lens unit 31, in another structure manner of the present embodiment, as shown in fig. 8 and 9, the outer shape of the fresnel lens unit 31 is set to be rectangular, and the plural fresnel lens units 31 are arranged in a matrix or staggered manner; although the light collection efficiency of the rectangular fresnel lens unit 31 is inferior to that of the regular hexagonal arrangement, the overall shape of the fresnel lens unit 31 in the matrix arrangement is easily matched with the edge of the rectangular liquid crystal display 41, the number of the light emitters 21, the number of the light collecting lenses 221 and the number of the fresnel lens units 31 are respectively 15, and the light emitters, the light collecting lenses 221 and the fresnel lens units 31 are equally divided into three rows, as shown in fig. 9, and the mold of the rectangular fresnel lens unit 31 is convenient to manufacture and low in cost; in addition, in order to avoid that the rectangular joint boundary is too long and the shadow at the spliced part is easily perceived, as shown in fig. 8, the rectangular fresnel lens unit 31 may be arranged in a staggered manner, at this time, the number of the light emitters 21, the condensing lens 221 and the fresnel lens unit 31 may be respectively set to 16, and 16 light emitters 21 are divided into 3 rows, 6 light emitters 21 are arranged in the middle row, the number of the light emitters 21 in the other two rows is 5, and the condensing lens 221 and the fresnel lens unit 31 are respectively arranged corresponding to 16 light emitters 21, so that the problem that the shadow in the matrix arrangement manner is easily perceived can be solved; in this embodiment, the circular symmetric sawtooth 311 structure is also disposed on the rectangular fresnel lens, so that the light source brightness can be uniformly distributed on the surface of the fresnel lens unit 31, and the thickness of the array lens 30 is further reduced.
Based on the above embodiments, further, as shown in fig. 7 and 10, an assisting lens 40 is disposed between the liquid crystal display 41 and the array lens 30, which is used to assist the illumination light source to be confined so as to be incident into the aperture of the front imaging optical system, and preferably, the assisting lens 40 is a fresnel lens; when the present embodiment is applied to a head-up display, as shown in fig. 7, since the visible range 61 of the human eye 62 is a rectangular region in front of the eye, in order to transmit the image on the liquid crystal display 41 to the visible range 61 by the backlight system, a fresnel lens having a concave lens structure may be additionally disposed between the liquid crystal display 41 and the array lens 30, and the fresnel lens can help to guide the illumination light source into the visible range 61 of the human eye 62 after the illumination light source is emitted from the liquid crystal display 41, so that the light is more sufficient.
When in use, the light projected by each light emitter 21 on the circuit board 20 is condensed and equalized by the corresponding condensing lens 221 and fresnel lens unit 31, and then the light is guided into the range of the liquid crystal display 41 by the assisting lens 40 and is uniformly projected, so that the light can be guided into the visible range 61 of human eyes 62 by the light combiner 60 to receive video images.
When the present embodiment is applied to a projector, the fresnel lens has a convex lens structure, and can guide illumination light into a diaphragm of the projection lens.
In addition, the fresnel lens unit 31 of the array lens 30 of the present invention adopts a microstructure with extremely small height of the saw teeth 311, and the production thereof adopts the processes of exposure and transfer printing, and can be attached to a large-area PET plastic or PC sheet; the user can cut a large amount of lighting area, and need not make additional mold for different size LCD 41, so it is suitable for mass production and low cost.
The invention has exquisite design and has the following advantages when in use:
a. the Fresnel lens unit 31 with the sawtooth 311 of the section being less than 50 microns in height is used for forming the array lens 30, after receiving the light sources of the luminous body 21 and the condensing lens 221, the backlight effect with high brightness and uniform brightness can be achieved, the common light guide column and diffusion sheet structure is omitted, the brightness is higher, the cost is saved, the thickness is thinner, and the Fresnel lens unit has the advantages of not occupying space and reducing heat dissipation space;
b. the Fresnel lens units 31 of the array lens 30 are arranged in a regular hexagon or rectangle shape, wherein the array lens 30 formed by arranging the regular hexagon Fresnel lens units 31 in a honeycomb shape can have the advantage of optimal light collection efficiency; the rectangular Fresnel lens unit 31 is a matrix or staggered array lens 30, so that the mold has the advantages of convenience in manufacturing and low cost;
c. the present invention can further provide an auxiliary lens 40 in front of the array lens 30 to guide the light source into the aperture range of the rear imaging optical system, so that the light source will not be lost and wasted, and is particularly suitable for being applied to the backlight illumination system of the liquid crystal display 41 such as a head-up display or a projector.
The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present patent application are included in the protection scope of the present patent application.
Claims (10)
1. The backlight illumination system with the directivity for the thin liquid crystal display is characterized by comprising a base (10), a circuit board (20), a condenser lens group (22) and an array lens (30), wherein an accommodating space is arranged in the base (10), the circuit board (20) is arranged at the bottom of the accommodating space of the base (10), a plurality of luminous bodies (21) are arranged on the circuit board (20), the condenser lens group (22) is arranged in the accommodating space and positioned above the circuit board (20), the condenser lens group (22) comprises a plurality of condenser lenses (221), each condenser lens (221) is arranged corresponding to each luminous body (21), the array lens (30) is arranged at the top of the accommodating space of the base (10) and positioned above the condenser lens group (22), and the array lens (30) comprises a plurality of Fresnel lens units (31), wherein each Fresnel lens unit (31) is arranged corresponding to each condensing lens (221), and the height of the sawtooth (311) of the section of the Fresnel lens unit (31) is less than 50 microns.
2. The system of claim 1, wherein each of the plurality of light emitters (21) is covered by a condensing lens (221).
3. The system of claim 2, wherein the condenser lens (221) is made of silicone material.
4. The system of claim 1, wherein the Fresnel lens unit (31) has a regular hexagonal shape, and the Fresnel lens units (31) are arranged in a honeycomb shape.
5. The system as claimed in claim 1, wherein the Fresnel lens unit (31) is rectangular and the Fresnel lens units (31) are arranged in matrix or offset.
6. A directional low-profile LCD backlighting system according to claim 4 or 5, wherein said Fresnel lens unit (31) is provided with a circularly symmetric sawtooth (311) structure.
7. The system of claim 1, further comprising a liquid crystal display (41), wherein the liquid crystal display (41) is located above the array lens (30), and the liquid crystal display (41) is configured to receive the light from the array lens (30).
8. The system of claim 7, wherein an auxiliary lens (40) is disposed between the liquid crystal display (41) and the array lens (30).
9. The system of claim 8, wherein the assisting lens (40) is a Fresnel lens.
10. The system of claim 1, wherein the light emitters (21) are white light emitting diodes.
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| CN201910651430.2A CN112241084A (en) | 2019-07-18 | 2019-07-18 | Thin liquid crystal display backlight illuminating system with directivity |
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| CN201910651430.2A CN112241084A (en) | 2019-07-18 | 2019-07-18 | Thin liquid crystal display backlight illuminating system with directivity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114326142A (en) * | 2021-11-24 | 2022-04-12 | 中山大学 | Full-parallax naked-eye 3D display system and method based on human eye tracking |
| CN115327818A (en) * | 2022-08-31 | 2022-11-11 | 义乌清越光电技术研究院有限公司 | Backlight module, preparation method of backlight module and display device |
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| CN107543082A (en) * | 2017-10-18 | 2018-01-05 | 广东工业大学 | A kind of Fresnel Lenses for super brightness back light system |
| TW201944142A (en) * | 2018-04-20 | 2019-11-16 | 至辰光電科技股份有限公司 | Directional thin liquid crystal display backlight illumination system including concentrating lens and Fresnel lens units |
| CN108563074A (en) * | 2018-06-04 | 2018-09-21 | 东莞广辰光电科技有限公司 | A kind of slim back lighting of liquid crystal display system of tool directionality |
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