CN110394986A - A kind of 3D printing system - Google Patents
A kind of 3D printing system Download PDFInfo
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- CN110394986A CN110394986A CN201910671520.8A CN201910671520A CN110394986A CN 110394986 A CN110394986 A CN 110394986A CN 201910671520 A CN201910671520 A CN 201910671520A CN 110394986 A CN110394986 A CN 110394986A
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- liquid crystal
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- crystal layer
- light source
- retardation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
The embodiment of the invention discloses a kind of 3D printing system, which includes: light source, and the wave-length coverage of light source is 365nm~420nm；Resin storage tank is used for storing liquid photosensitive resin positioned at the light emission side of light source；Liquid crystal display panel, between light source and resin storage tank, liquid crystal display panel includes the first substrate being oppositely arranged and the second substrate, and the liquid crystal layer between first substrate and the second substrate；Liquid crystal layer is greater than or equal to 250nm to the retardation of incident light, is less than or equal to 320nm；Wherein, retardation is the birefringence difference of liquid crystal and the product of thickness of liquid crystal layer in liquid crystal layer.The technical solution of the embodiment of the present invention can be improved liquid crystal display panel to the transmitance of 3D printing backlight, reduce light source power, reduce liquid crystal display panel temperature, improve the liquid crystal display panel service life.
Description
Technical field
The present embodiments relate to 3D printing technique more particularly to a kind of 3D printing systems.
Background technique
Rapid shaping (i.e. 3D printing) technology is a kind of three-dimensional modeling data according to object, by molding equipment with layer-by-layer
The mode of superposition manufactures the technology of entity, and the simplification production of arbitrarily complicated structure member may be implemented in it, can overcome traditional machine
Tool processes the obstacle that can not make special construction.Existing 3D printing technique mainly includes fused glass pellet (FDM), selectivity
Laser sintered (SLS), stereolithography (SLA), digital light processing (DLP) several ways.
It is existing to be achieved in that substantially for stereolithography (SLA) technology based on liquid crystal display panel: under straight
Formula 385nm/405nm/420nm near ultraviolet Matrix LED light source serves as light using liquid crystal display panel in print procedure as backlight
Cover, control backlight carry out accurate exposure in specific pattern position.Using the resin material meeting for negativity resin, being exposed
It is cured, by layer-by-layer cured mode, 3D model required for finally printing.
Traditional liquid crystal panel mainly does display purposes, and backlight used in 3D printing is generally black light.If 3D printing
Using traditional liquid crystal display panel as light shield, optical transmittance of the backlight under traditional liquid crystal display panel used in 3D printing compared with
It is low, such as the retardation of liquid crystal layer of traditional liquid crystal panel is designed mainly for the more sensitive green-yellow light of human eye, generally
Design is in 330nm-370nm, when being used for 3D printing, as backlight wavelength selection 405nm, and transmitance about 0.8%-1%, thus
Cause the power consumption of 3D printing higher.In addition, transmitance of the black light under traditional liquid crystal display panel is low to also result in liquid crystal surface
Plate fever, reduces the service life of liquid crystal display panel.
Summary of the invention
The embodiment of the present invention provides a kind of 3D printing system, by rationally designing the retardation of liquid crystal display panel, improves liquid crystal
Panel reduces light source power to the transmitance of 3D printing backlight, reduces liquid crystal display panel temperature, improves the liquid crystal display panel service life.
The embodiment of the present invention provides a kind of 3D printing system, comprising:
Light source, the wave-length coverage of the light source are 365nm~420nm；
Resin storage tank is used for storing liquid photosensitive resin positioned at the light emission side of the light source；
Liquid crystal display panel, between the light source and the resin storage tank, the liquid crystal display panel includes first be oppositely arranged
Substrate and the second substrate, and the liquid crystal layer between the first substrate and the second substrate；
The liquid crystal layer is greater than or equal to 250nm to the retardation of incident light, is less than or equal to 320nm；
Wherein, the retardation is the product of the birefringence difference of liquid crystal and the thickness of liquid crystal layer in the liquid crystal layer.
3D printing system provided in an embodiment of the present invention, comprising: light source, the wave-length coverage of light source are 365nm~420nm,
It should be noted that wavelength here refers to dominant wavelength；Resin storage tank, it is photosensitive for storing liquid positioned at the light emission side of light source
Resin；Liquid crystal display panel, between light source and resin storage tank, liquid crystal display panel includes the first substrate being oppositely arranged and the second substrate,
And the liquid crystal layer between first substrate and the second substrate；Liquid crystal layer is greater than or equal to 250nm to the retardation of incident light,
Less than or equal to 320nm；Wherein, retardation is the birefringence difference of liquid crystal and the product of thickness of liquid crystal layer in liquid crystal layer.Pass through
The retardation of the wavelength of light source when for 3D printing, the liquid crystal layer of optimal setting liquid crystal display panel is being greater than or equal to 250nm, is less than
Or it is equal to 320nm, it can effectively improve the transmitance of liquid crystal display panel, so that playing reduces light source power, reduces liquid crystal display panel temperature
Degree, the purpose for improving the liquid crystal display panel service life.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of 3D printing system provided in an embodiment of the present invention；
Fig. 2 be different wave length provided in an embodiment of the present invention light source in different delays amount the analog result of transmitance show
It is intended to；
Fig. 3 is a kind of overlooking structure diagram of liquid crystal display panel provided in an embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of the light source of 3D printing system provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of liquid crystal display panel provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of another liquid crystal display panel provided in an embodiment of the present invention；
Fig. 7 is the overlooking structure diagram of another liquid crystal display panel provided in an embodiment of the present invention；
Fig. 8 is the schematic diagram of the section structure along Fig. 7 vertical center line AA'；
Fig. 9 is the overlooking structure diagram of another liquid crystal display panel provided in an embodiment of the present invention；
Figure 10 is the overlooking structure diagram of another liquid crystal display panel provided in an embodiment of the present invention；
Figure 11 is the overlooking structure diagram of another liquid crystal display panel provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
The term used in embodiments of the present invention is only to be not intended to be limiting merely for for the purpose of describing particular embodiments
The present invention.It should be noted that the nouns of locality such as "upper", "lower" described in the embodiment of the present invention, "left", "right" are with attached drawing institute
The angle shown should not be construed as the restriction to the embodiment of the present invention come what is be described.Furthermore within a context, it is also necessary to understand
, when mentioning an element and being formed on "above" or "below" another element, another can not only be formed directly into
Perhaps "lower" can also be indirectly formed by intermediary element in another element "upper" or "lower" for element "upper".Term " first ",
" second " etc. is used for description purposes only, and is not offered as any sequence, quantity or importance, and is used only to distinguish different groups
At part.For the ordinary skill in the art, above-mentioned term in the present invention specific can be understood with concrete condition
Meaning.
Fig. 1 show a kind of structural schematic diagram of 3D printing system provided in an embodiment of the present invention.With reference to Fig. 1, this implementation
The 3D printing system that example provides includes: light source 10, and the wave-length coverage of light source 10 is 365nm~420nm；Resin storage tank 20 is located at light
The light emission side in source 10 is used for storing liquid photosensitive resin 21；Liquid crystal display panel 30, between light source 10 and resin storage tank 20, liquid crystal
Panel 30 includes the first substrate 31 being oppositely arranged and the second substrate 32, and between first substrate 31 and the second substrate 32
Liquid crystal layer 33；Liquid crystal layer 33 is greater than or equal to 250nm to the retardation of incident light, is less than or equal to 320nm；Wherein, postpone
Amount is the birefringence difference of liquid crystal and the product of thickness of liquid crystal layer in liquid crystal layer.Load carrier 40 is located at liquid photosensitive resin 21
Interior, the photosensitive resin after solidification is fixed on load carrier 40, and load carrier 40 is based on the display timing of liquid crystal display panel 30 in the side z
It moves up, the direction z is identical as the beam exit direction of liquid crystal display panel 30.
It is understood that 3D printing system further includes the bracket and control mechanism for supporting each section, it is not shown in Fig. 1.
Liquid crystal display panel 30 (In Plane Switching, IPS) can be converted for flat field or fringing field converts (Fringe Field
Switching, FFS) mode liquid crystal display panel.It is birefringent to refer to a phenomenon that incident ray generates two refracted lights.Light
Line is incident on anisotropic crystal (such as quartz, calcite etc.), is decomposed into that direction of vibration is orthogonal, spread speed is different
Two kinds of polarised lights, wherein the light beam for meeting the law of refraction is known as ordinary light, be unsatisfactory for the law of refraction light beam be known as very
Light.Liquid crystal molecule is anisotropic molecule, and the refractive index to ordinary light is no, the refractive index to non-ordinary light is ne, liquid crystal it is two-fold
Penetrate rate difference Δ n=| no-ne|, the product of Δ n and thickness of liquid crystal layer d are retardation of the liquid crystal layer to incident light.
It is traditionally used for the display panel of colored display, the general fixed design of the retardation of liquid crystal layer is in general 330-
Between 370nm, the maximum transmission of visible light may be implemented, according to transmissivity of liquid crystal display panel to the empirical equation of visible light:
When transmitance T takes maximum:
Consider to reduce scattering in box, it is thick to make low box, it may be assumed that
Calculate λ when taking 405nm the corresponding retardation of optimum transmission be 203nm, however applicant by simulation with it is real
Verifying discovery, when wavelength is 405nm, retardation when transmitance highest is near 295nm, it follows that tradition display is used
Liquid crystal display panel retardation mentality of designing using transmitance can be lost in the 3D printing system of near ultraviolet light source.
Fig. 2 show the simulation knot of light source transmitance in different delays amount of different wave length provided in an embodiment of the present invention
Fruit schematic diagram.It is within the scope of 365nm-420nm, when setting retardation is between 250nm-320nm in optical source wavelength with reference to Fig. 2
When, the transmitance highest of liquid crystal display panel (transmitance is all larger than 5.16%).As shown in Figure 2, when retardation is greater than 500nm, liquid
There are also other peak values for the transmitance of crystal panel, but high latency amount feasibility for liquid crystal panel manufacture process and material is lower, and
And retardation it is higher when may have dark-state light leakage, influence 3D printing effect, thus only taken in the present embodiment in curve
Retardation in one peak ranges.
The technical solution of the embodiment of the present invention, the wavelength of light source when by being directed to 3D printing, optimal setting liquid crystal display panel
The retardation of liquid crystal layer is being greater than or equal to 250nm, is less than or equal to 320nm, can effectively improve the transmitance of liquid crystal display panel,
To play the purpose for reducing light source power, reducing liquid crystal display panel temperature, improving the liquid crystal display panel service life.
On the basis of the above embodiments, optionally, when the wavelength of light source is 365nm, delay of the liquid crystal layer to incident light
Amount is greater than or equal to 250nm, is less than or equal to 270nm；When the wavelength of light source is 385nm, retardation of the liquid crystal layer to incident light
More than or equal to 270nm, it is less than or equal to 290nm；When the wavelength of light source is 395nm, liquid crystal layer is big to the retardation of incident light
In or equal to 280nm, it is less than or equal to 300nm；When the wavelength of light source is 405nm, liquid crystal layer is greater than the retardation of incident light
Or it is equal to 285nm, it is less than or equal to 305nm；The wavelength of light source be 420nm when, liquid crystal layer the retardation of incident light is greater than or
Equal to 300nm, it is less than or equal to 320nm.
With continued reference to Fig. 2, when optical source wavelength is 365nm, the retardation of liquid crystal layer has most between 250nm-270nm
Big transmitance 5.43%；When optical source wavelength is 385nm, the retardation of liquid crystal layer has maximum saturating between 270nm-290nm
Cross rate 8.45%；When optical source wavelength is 395nm, the retardation of liquid crystal layer has maximum transmission between 280nm-300nm
10.49%；When optical source wavelength is 405nm, the retardation of liquid crystal layer has maximum transmission between 285nm-305nm
12.44%；When optical source wavelength is 420nm, the retardation of liquid crystal layer has maximum transmission between 300nm-320nm
14.66%.It should be noted that retardation selects 320nm even if light source selects wavelength for 365nm, transmitance also be can reach
5.16%, transmitance has promotion for traditional liquid crystal display panel, it should be noted that different optical source wavelengths are upper
There is maximum transmitance within the scope of the retardation stated, and still set up under certain fabrication error or technological fluctuation.
Optionally, liquid crystal display panel includes the multiple regions of at least two class array arrangements, and the type in two neighboring region is not
Together, each region includes at least one pixel unit, and the liquid crystal layer in inhomogeneity region is different to the retardation of same incident light.
Illustratively, Fig. 3 show a kind of overlooking structure diagram of liquid crystal display panel provided in an embodiment of the present invention.With reference to
Fig. 3, multiple regions of the liquid crystal display panel 30 including two class array arrangements, respectively first area 301 and second area 302, often
A region may include a pixel unit, also may include multiple pixel units, in first area 301 and second area 302
Liquid crystal layer it is different to the retardation of same incident light.
It is understood that liquid crystal display panel provided in this embodiment is for that can be not provided with colored filter in 3D printing system
Mating plate.By liquid crystal display panel subregion being arranged different retardations, same liquid crystal display panel can be made to be suitable for different light sources
In 3D printing system, such as first area 301 is designed as 295nm to the retardation of the light of 405nm, and second area 302 is to 405nm
The retardation of light be designed as 285nm, second area 302 is about 290nm to the retardation of the light of 395nm at this time, exactly
The optimal delay amount of 395nm light, in this way when the light source printing for 405nm, first area and second area can be achieved to beat
Print in order to realize uniform printing effect, also can control second area closing, such as by driving chip to signal, control certainly
Second area processed is closed, and when being printed with the light source of 395nm, equally be can use driving chip to signal, is realized first area
Closing.It should be noted that can design the light source that different zones correspond to Same Wavelength according to actual needs has different prolong
Chi Liang, can also design different zones and correspond to different wavelength has different retardations, here without limitation.Such liquid crystal display panel
It can be adapted for the light source of wavelength not of the same race, in other embodiments, other partitioned modes can also be set, realize and do not have to area
3D printing is realized with different ultraviolet lights in domain.
It should be noted that number of partitions and partitioned mode shown in Fig. 3 are only illustrative, when specific implementation, can
To design according to actual needs, it is not limited in the embodiment of the present invention.
Optionally, the light source of 3D printing system provided in this embodiment includes luminous the two of at least two sending different wave lengths
Pole pipe.
Illustratively, Fig. 4 show a kind of structural schematic diagram of the light source of 3D printing system provided in an embodiment of the present invention,
The light source 10 includes the first light emitting diode 101 for issuing 405nm wavelength and the second light emitting diode for issuing 395nm wavelength
102, the first light emitting diode 101 is corresponding with the first area 301 in Fig. 3, second in second light emitting diode 102 and Fig. 3
Region 302 is corresponding, and when the work of the first light emitting diode 101, the pixel of the second light emitting diode 102 and second area can be with
It is controlled and is closed by driving circuit, further, light source can select micro- light emitting diode micro-LED, each micro-LED
The light of sending is corresponding with the region for being correspondingly arranged optimal delay amount, to promote the performance of 3D printing system, it should be noted that be
The uniform printing effect of realization, different light emitting diodes can be intervally arranged.
Optionally, the thickness of the liquid crystal layer in different zones is different.
Illustratively, Fig. 5 show a kind of structural schematic diagram of liquid crystal display panel provided in an embodiment of the present invention, with reference to Fig. 5,
By the way that the optical adhesive layer 321 of different-thickness is arranged in the second substrate 32, the thickness of different zones liquid crystal layer is adjusted, to make not
It is different with retardation of the region to same incident light.
It is understood that being additionally provided with black matrix 322 on first substrate 32, black matrix includes multiple openings, Mei Gekai
Mouth forms the transmission region of a pixel unit.
Fig. 6 show the structural schematic diagram of another liquid crystal display panel provided in an embodiment of the present invention, with reference to Fig. 6, by
The insulating layer 311 of different-thickness is set on first substrate 31, the thickness of different zones liquid crystal layer is adjusted, to make different zones pair
The retardation of same incident light is different.
It should be noted that in other embodiments, the first substrate and the second base of different zones can also be arranged simultaneously
The thickness of plate is all different, to realize that the thickness of liquid crystal layer of different zones is different, it is not limited in the embodiment of the present invention.
Optionally, the liquid crystal material of the liquid crystal layer in different zones is different.
It is understood that due to liquid crystal layer retardation be liquid crystal birefringence difference and thickness of liquid crystal layer product,
In addition to setting thickness of liquid crystal layer is different, the retardation of liquid crystal layer can also be changed by changing the liquid crystal material of different zones.
Optionally, the liquid crystal display panel for the 3D printing system that the present embodiment improves further includes barrier wall structure, and barrier wall structure is used for
The liquid crystal in inhomogeneity region is prevented to be mixed.
Illustratively, Fig. 7 show the overlooking structure diagram of another liquid crystal display panel provided in an embodiment of the present invention, figure
8 show the schematic diagram of the section structure along Fig. 7 vertical center line AA', and with reference to Fig. 7 and Fig. 8, barrier wall structure is arranged between different zones
34, barrier wall structure 34 can be pectinate texture, pour into different types of liquid crystal, two continuous envelopes from different irrigation crystal mouths respectively
Barricade is closed in the comb teeth-shaped structure of occlusion.When it is implemented, barrier wall structure 34 can be black in the second substrate 32 by being arranged in
Matrix part extends to first substrate 31, can also be by the way that the organic layer including multiple grooves is arranged on first substrate 31, often
The corresponding region of a groove, the top of groove and the second substrate 32 are in close contact, and prevent the liquid crystal in inhomogeneity region from occurring mixed
It closes.
Fig. 9 show the overlooking structure diagram of another liquid crystal display panel provided in an embodiment of the present invention, should with reference to Fig. 9
The barrier wall structure 34 of homogeneous region is interconnected in liquid crystal display panel, i.e., liquid crystal display panel shown in Fig. 9 is provided only with two irrigation crystal mouths.
The overlooking structure diagram of another liquid crystal display panel provided in an embodiment of the present invention is shown shown in Figure 10, with reference to figure
10, the barrier wall structure of the display panel in the present embodiment is reduced, and technology difficulty can be effectively reduced.Optionally, such as work as display
When panel includes two kinds of liquid crystal materials, one of liquid crystal material is formed into interconnected structure with barricade, and including one
A irrigation crystal mouth, another liquid crystal are not provided with barricade (in figure not), and two kinds of liquid crystal also may be implemented and separate, and reduce barricade
Technique, the embodiment of the present invention are not construed as limiting this.Optionally, further include frame glue between liquid crystal display panel, by array substrate and
After color membrane substrates fitting, irrigation crystal mouth is reserved, the embodiment of the present invention is not construed as limiting this.
Optionally, the liquid crystal layer in different zones is less than or equal to the absolute value of the difference of the retardation of same incident light
10nm.It is understood that setting different zones liquid crystal layer may result in greatly very much only the retardation difference of same incident light
It is uneven with transmitance when the light source of wavelength a kind of, in the present embodiment, the liquid crystal layer in different zones is set to same incidence
The absolute value of the difference of the retardation of light is less than or equal to 10nm, and liquid crystal display panel can be made to be suitable for the light source of at least two wavelength,
It can also be to avoid the deviation as caused by fabrication error.
Figure 11 show the overlooking structure diagram of another liquid crystal display panel provided in an embodiment of the present invention.With reference to Figure 11,
Optionally, first substrate includes array, pixel electrode 313 and the public electrode 314 that multiple thin film transistor (TFT)s 312 are formed；Also wrap
It includes a plurality of along first direction x extension, the scan line 315 that y is arranged in a second direction and a plurality of y in a second direction extension, first party
The data line 316 arranged to x, first direction x intersect with second direction y, adjacent two scan lines 315 and adjacent two datas line
Pixel region is formed between 316；The second substrate includes black matrix 322, and black matrix 322 covers film crystal in the projection of first substrate
In the projection of first substrate, black matrix 322 includes multiple a pair of with pixel region one for pipe 312, scan line 315 and data line 316
The opening 3221 answered, opening 3221 in a first direction x size be equal to opening 3221 second direction y size.
It is understood that liquid crystal display panel provided in this embodiment can be the liquid crystal display panel of IPS or FFS mode, due to
The liquid crystal display panel does not need to realize colored display, and there is no need to colored filter is arranged.4 pictures are only shown schematically in Fig. 8
Plain area, control of the liquid crystal of each pixel region by the electric field formed to pixel electrode 313 and public electrode 314, when different pictures
When plain area corresponds to different retardations, state phase of the pixel region (light transmission and opaque) on and off with corresponding region light source
Together.By be arranged black matrix 322 opening 3221 in a first direction x size be equal to opening 3221 second direction y size,
It can guarantee that first direction x is identical with the printing precision of second direction y.
Optionally, the projection in first substrate that is open is square or round.
It is understood that opening 3221 shown in Figure 11 is square and is only illustrative, in other embodiments,
It can be circle with the shape of this opening 3221, the embodiment of the present invention is not construed as limiting this.
Optionally, the thickness of liquid crystal layer is greater than or equal to 2.7 μm, is less than or equal to 3.4 μm.
It is understood that since liquid crystal molecule birefringence difference is limited, liquid crystal layer it is too thin or too it is thick be all unable to reach it is pre-
If retardation, and liquid crystal layer setting it is too thin will increase technology difficulty, lead to increased costs, liquid crystal layer is too thick to may result in leakage
Light causes liquid crystal display panel contrast to decline.In the present embodiment, the thickness range that liquid crystal layer is arranged is 2.7 μm -3.4 μm, such as works as liquid
Crystal layer with a thickness of 3.1 μm when, when the wavelength of light source is 395nm, liquid crystal layer is greater than or equal to the retardation of incident light
280nm is less than or equal to 300nm；When liquid crystal layer is with a thickness of 3.1 μm, when the wavelength of light source is 405nm, liquid crystal layer is to entering
The retardation for penetrating light is greater than or equal to 285nm, is less than or equal to 305nm, i.e., the thickness of the same liquid crystal layer realizes different light sources
The printing of wavelength, is also possible to the thickness of different liquid crystal layers but same light source wavelength realizes printing, here without limitation.
Optionally, the birefringence difference of liquid crystal is greater than or equal to 0.097 in liquid crystal layer, is less than or equal to 0.102.This implementation
Refractive index n to non-ordinary light of the liquid crystal in 365nm-420nm wave-length coverage used in exampleeRange be 1.611-1.595, it is right
The refractive index n of ordinary lightoRanges of indices of refraction be 1.509-1.498, the birefringence difference of liquid crystal is greater than or equal in liquid crystal layer
0.097, it is less than or equal to 0.102.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts, be combined with each other and substitutes without departing from protection scope of the present invention.Therefore, although by above embodiments to this
Invention is described in further detail, but the present invention is not limited to the above embodiments only, is not departing from present inventive concept
In the case of, it can also include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (12)
1. a kind of 3D printing system characterized by comprising
Light source, the wave-length coverage of the light source are 365nm~420nm；
Resin storage tank is used for storing liquid photosensitive resin positioned at the light emission side of the light source；
Liquid crystal display panel, between the light source and the resin storage tank, the liquid crystal display panel includes the first substrate being oppositely arranged
And the second substrate, and the liquid crystal layer between the first substrate and the second substrate；
The liquid crystal layer is greater than or equal to 250nm to the retardation of incident light, is less than or equal to 320nm；
Wherein, the retardation is the product of the birefringence difference of liquid crystal and the thickness of liquid crystal layer in the liquid crystal layer.
2. 3D printing system according to claim 1, which is characterized in that when the wavelength of the light source is 365nm, the liquid
Crystal layer is greater than or equal to 250nm to the retardation of incident light, is less than or equal to 270nm；
When the wavelength of the light source is 385nm, the liquid crystal layer is greater than or equal to 270nm to the retardation of incident light, be less than or
Equal to 290nm；
When the wavelength of the light source is 395nm, the liquid crystal layer is greater than or equal to 280nm to the retardation of incident light, be less than or
Equal to 300nm；
When the wavelength of the light source is 405nm, the liquid crystal layer is greater than or equal to 285nm to the retardation of incident light, be less than or
Equal to 305nm；
When the wavelength of the light source is 420nm, the liquid crystal layer is greater than or equal to 300nm to the retardation of incident light, be less than or
Equal to 320nm.
3. 3D printing system according to claim 1, which is characterized in that the liquid crystal display panel is arranged including at least two class arrays
The multiple regions of cloth, and the type in two neighboring region is different, each region includes at least one pixel unit, inhomogeneity region
Interior liquid crystal layer is different to the retardation of same incident light.
4. 3D printing system according to claim 3, which is characterized in that the thickness of the liquid crystal layer in inhomogeneity region is not
Together.
5. 3D printing system according to claim 3, which is characterized in that the liquid crystal material of the liquid crystal layer in inhomogeneity region
It is different.
6. 3D printing system according to claim 5, which is characterized in that the liquid crystal display panel further includes barrier wall structure, institute
Barrier wall structure is stated for preventing the liquid crystal in inhomogeneity region to be mixed.
7. 3D printing system according to claim 3, which is characterized in that the liquid crystal layer in different zones is to same incident light
The absolute value of the difference of retardation is less than or equal to 10nm.
8. 3D printing system according to claim 1, which is characterized in that the first substrate includes multiple thin film transistor (TFT)s
Array, pixel electrode and the public electrode of formation；It further include a plurality of scan line for extending in a first direction, arranging in a second direction
With a plurality of data line along second direction extension, first direction arrangement, the first direction and the second direction
Intersection, forms pixel region between adjacent two scan lines and adjacent two data lines；
The second substrate includes black matrix, the black matrix the projection of the first substrate cover the thin film transistor (TFT),
In the projection of the first substrate, the black matrix includes multiple and the pixel region one for the scan line and the data line
One corresponding opening, the opening are equal to the opening in the size of the second direction in the size of the first direction.
9. 3D printing system according to claim 8, which is characterized in that the opening is projected as in the first substrate
Square is round.
10. 3D printing system according to claim 1, which is characterized in that the thickness of the liquid crystal layer is greater than or equal to 2.7
μm, it is less than or equal to 3.4 μm.
11. 3D printing system according to claim 1, which is characterized in that the birefringence of liquid crystal is poor in the liquid crystal layer
More than or equal to 0.097, it is less than or equal to 0.102.
12. 3D printing system according to claim 3, which is characterized in that the light source includes that at least two sendings are different
The light emitting diode of wavelength.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11345093B2 (en) | 2020-05-21 | 2022-05-31 | Essentium, Inc. | System and method of detecting failed bed adhesion for a three-dimensional printer |
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|---|---|---|---|---|
| CN1697998A (en) * | 2003-02-25 | 2005-11-16 | 东芝松下显示技术有限公司 | Liquid crystal display element of semi-transmission type |
| CN107175815A (en) * | 2017-07-13 | 2017-09-19 | 上海天马微电子有限公司 | A kind of transmissive liquid crystal panel and 3D printing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1697998A (en) * | 2003-02-25 | 2005-11-16 | 东芝松下显示技术有限公司 | Liquid crystal display element of semi-transmission type |
| CN107175815A (en) * | 2017-07-13 | 2017-09-19 | 上海天马微电子有限公司 | A kind of transmissive liquid crystal panel and 3D printing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11345093B2 (en) | 2020-05-21 | 2022-05-31 | Essentium, Inc. | System and method of detecting failed bed adhesion for a three-dimensional printer |
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