CN110293675B

CN110293675B - Light control assembly, 3D printing device and 3D printing method

Info

Publication number: CN110293675B
Application number: CN201910573355.2A
Authority: CN
Inventors: 方浩博; 张勇; 王建; 华刚; 林坚; 张丽敏; 张亚伟; 杨智超; 秦相磊; 孙泽鹏
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2021-04-02
Anticipated expiration: 2039-06-28
Also published as: CN110293675A

Abstract

The invention relates to the technical field of 3D printing, in particular to a light control assembly, a 3D printing device and a 3D printing method. The 3D printing precision is improved. The embodiment of the invention provides a light control assembly, which comprises a first liquid crystal panel and a second liquid crystal panel which are arranged in a stacked mode; the first liquid crystal panel comprises a plurality of first sub-pixels; the second liquid crystal panel comprises a plurality of second sub-pixels, and the orthographic projection of each boundary of the first sub-pixels is positioned in the orthographic projection enclosing region of the boundary of at least one second sub-pixel along the thickness direction of the first liquid crystal panel and the second liquid crystal panel; the orthographic projection of the first sub-pixel and the orthographic projection of at least two second sub-pixels are partially overlapped. The embodiment of the invention is used for improving the 3D printing precision.

Description

Light control assembly, 3D printing device and 3D printing method

Technical Field

The invention relates to the technical field of 3D printing, in particular to a light control assembly, a 3D printing device and a 3D printing method.

Background

Since the advent of 3D printing technology, the method has a wide application prospect in the fields of health care, manufacturing industry, military and the like.

According to the materials currently used in 3D printing, the molding techniques can be divided into two types, one is a molding technique in which various powders or films are used as raw materials and melting and sintering are performed by laser, and the other is a molding technique in which liquid resin is used as a raw material and is cured by controlling the light flux.

Disclosure of Invention

The invention mainly aims to provide a light control assembly, a 3D printing device and a 3D printing method. The 3D printing precision is improved.

In order to achieve the purpose, the invention adopts the following technical scheme:

in one aspect, an embodiment of the present invention provides a light control assembly, including a first liquid crystal panel and a second liquid crystal panel stacked together; the first liquid crystal panel comprises a plurality of first sub-pixels; the second liquid crystal panel comprises a plurality of second sub-pixels, and the orthographic projection of each boundary of the first sub-pixels is positioned in the orthographic projection enclosing region of the boundary of at least one second sub-pixel along the thickness direction of the first liquid crystal panel and the second liquid crystal panel; the orthographic projection of the first sub-pixel and the orthographic projection of at least two second sub-pixels are partially overlapped.

Optionally, along the thickness direction of the first liquid crystal panel and the second liquid crystal panel, the orthographic projection of each boundary of the first sub-pixel is located in an orthographic projection enclosing region of the boundary of one second sub-pixel; the orthographic projection of the first sub-pixel is partially overlapped with the orthographic projection of each of two adjacent second sub-pixels.

Optionally, each of the first sub-pixels is rectangular in shape; each second sub-pixel is in a prismatic shape; the orthographic projection of the first sub-pixel and the orthographic projection of the four second sub-pixels are partially overlapped.

Optionally, the light control assembly further includes a first polarizer and a second polarizer, and an absorption axis of the first polarizer is perpendicular to an absorption axis of the second polarizer; the first polarizer and the second polarizer are respectively arranged at two sides of the first liquid crystal panel and the second liquid crystal panel which are far away from each other; or the first polaroid and the second polaroid are respectively arranged at two opposite sides of the first liquid crystal panel, which are far away from and close to the second liquid crystal panel.

Optionally, the light control assembly further includes a third polarizer, the third polarizer is disposed between the second liquid crystal panel and the side close to the first liquid crystal panel, and an absorption axis of the third polarizer is perpendicular to an absorption axis of one of the first polarizer and the second polarizer, the one of the first polarizer and the second polarizer being far away from the second liquid crystal panel.

In another aspect, an embodiment of the present invention provides a 3D printing apparatus, including a light source and the light control assembly as described above, and a controller; the first liquid crystal panel in the light control assembly is arranged close to the light source relative to the second liquid crystal panel; the first liquid crystal panel is used for displaying an image corresponding to a pattern to be printed; the controller is used for acquiring all first sub-pixels which are used for displaying the image corresponding to the pattern to be printed in the first liquid crystal panel, and determining all first sub-pixels which correspond to the boundary of the pattern to be printed and the boundary of each first sub-pixel which corresponds to the boundary of the pattern to be printed according to the corresponding relation between each first sub-pixel which is used for displaying the image corresponding to the pattern to be printed in the first liquid crystal panel and the pattern to be printed; controlling the driving voltage of the second sub-pixel, and for each first sub-pixel corresponding to the boundary of the pattern to be printed, enabling the phase of light rays passing through the partial boundary positions of the first sub-pixels to be reversed relative to light rays passing through the rest boundary positions of the first sub-pixels, so as to obtain the pattern to be printed; wherein, the partial boundary of the first sub-pixel is all boundaries corresponding to the boundary of the pattern to be printed in the first sub-pixel, and the rest boundaries of the first sub-pixel are the rest boundaries except all boundaries corresponding to the boundary of the pattern to be printed in the first sub-pixel.

Optionally, the controller is specifically configured to control the driving voltage of the first portion of the second sub-pixels, and for each first sub-pixel corresponding to the boundary of the pattern to be printed, the boundary position of a portion of the first sub-pixels is made opaque, and the remaining boundary positions of the first sub-pixels are made transparent; the first part of second sub-pixels are all second sub-pixels in the area enclosed by the orthographic projections of the partial boundaries of the first sub-pixels and the orthographic projections of the boundaries of the second sub-pixels along the thickness direction of the first liquid crystal panel and the second liquid crystal panel.

Optionally, the controller is further configured to control the driving voltages of the first portion of the second sub-pixels and control the remaining second sub-pixels, except for the first portion of the second sub-pixels, of the plurality of second sub-pixels to be turned off.

Optionally, the liquid crystal display panel further comprises a liquid resin containing groove and a moving member, the liquid resin containing groove is arranged on one side of the second liquid crystal panel far away from the first liquid crystal panel, the moving member is arranged in the liquid resin containing groove and is in a position right opposite to the second liquid crystal panel, and a gap is reserved between the moving member and at least one inner wall of the liquid resin containing groove; the moving member is configured to move under the control of the controller to form a liquid resin layer on a side close to the second liquid crystal panel.

In another aspect, an embodiment of the present invention provides a 3D printing method, which is applied to the 3D printing apparatus described above; the 3D printing method comprises the following steps: turning on a light source; enabling the first liquid crystal panel to display an image corresponding to a pattern to be printed; acquiring all first sub-pixels displaying an image corresponding to a pattern to be printed in the first liquid crystal panel, and determining all first sub-pixels corresponding to the boundary of the pattern to be printed and the boundary of each first sub-pixel corresponding to the boundary of the pattern to be printed according to the corresponding relation between each first sub-pixel displaying the image corresponding to the pattern to be printed in the first liquid crystal panel and the pattern to be printed; controlling second sub-pixels in the second liquid crystal panel, and for each first sub-pixel corresponding to the boundary of the pattern to be printed, enabling light rays passing through the partial boundary positions of the first sub-pixels to be subjected to phase reversal relative to light rays passing through the rest boundary positions of the first sub-pixels, so as to obtain the pattern to be printed; wherein, the partial boundary of the first sub-pixel is all boundaries corresponding to the boundary of the pattern to be printed in the first sub-pixel, and the rest boundaries of the first sub-pixel are the rest boundaries except all boundaries corresponding to the boundary of the pattern to be printed in the first sub-pixel; and exposing and curing the liquid resin layer through the pattern to be printed.

Optionally, controlling the second sub-pixels in the second liquid crystal panel, and for each first sub-pixel corresponding to the boundary of the pattern to be printed, causing a phase of the light passing through a part of the boundary positions of the first sub-pixels to be inverted with respect to the light passing through the rest of the boundary positions of the first sub-pixels, includes: controlling the driving voltage of the first part of second sub-pixels, and enabling part of boundary positions of the first sub-pixels to be opaque and the rest of boundary positions of the first sub-pixels to be transparent aiming at each first sub-pixel corresponding to the boundary of the pattern to be printed; the first part of second sub-pixels are all second sub-pixels in the area enclosed by the orthographic projections of the partial boundaries of the first sub-pixels and the orthographic projections of the boundaries of the second sub-pixels along the thickness direction of the first liquid crystal panel and the second liquid crystal panel.

Optionally, the driving voltage of the first portion of the second sub-pixels is controlled, and for each first sub-pixel corresponding to the boundary of the pattern to be printed, the partial boundary position of the first sub-pixel is made opaque, and the rest boundary positions of the first sub-pixel are made transparent, and the 3D printing method further includes: and controlling the rest second sub-pixels except the first part of second sub-pixels in the plurality of second sub-pixels to be closed.

Optionally, the 3D printing apparatus further comprises a liquid resin containing tank and a moving member; before exposing and curing the liquid resin layer through the pattern to be printed, the 3D printing method further includes: and adding liquid resin into the liquid resin containing groove, controlling the moving member to move in the liquid resin containing groove, and forming a liquid resin layer on one side of the moving member, which is close to the light control assembly.

The embodiment of the invention provides a light control assembly, a 3D printing device and a 3D printing method, and compared with the method that light emitted by a light source is adjusted through a liquid crystal display panel (such as a first liquid crystal panel), the first liquid crystal panel is enabled to display an image corresponding to a pattern to be printed, and the light intensity at the position corresponding to the boundary of the image displayed by the first liquid crystal panel and the pattern to be printed is stronger, so that the improvement of 3D printing precision is not facilitated. In the embodiment of the invention, by additionally arranging the second liquid crystal panel, when 3D printing is performed, the second sub-pixels are controlled, and for each first sub-pixel corresponding to the boundary of the pattern to be printed, the light passing through the partial boundary position of the first sub-pixel is subjected to phase reversal relative to the light passing through the rest boundary positions of the first sub-pixels, that is, the light passing through the rest boundary positions of the first sub-pixels are kept in the original phase, and the difference in phase causes light intensity cancellation, so that the light intensity at the position corresponding to the boundary of the pattern to be printed can be reduced, a better image boundary is obtained, and the 3D printing precision is effectively improved. Here, the partial boundary of the first subpixel may be all boundaries of the first subpixel corresponding to the boundaries of the pattern to be printed, and in this case, the remaining boundaries of the first subpixel are the remaining boundaries of the first subpixel except all boundaries corresponding to the boundaries of the pattern to be printed.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a 3D printing apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a top view of a light control assembly according to an embodiment of the present invention;

FIG. 3 is a schematic top view of another light management assembly according to an embodiment of the present invention;

fig. 4 is a schematic top view of a first liquid crystal panel and a second liquid crystal panel according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view in the direction A-A' based on FIG. 4 according to an embodiment of the present invention;

FIG. 6 is a schematic top view of another light management assembly according to an embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view of a light control assembly according to an embodiment of the present invention;

FIG. 8 is a schematic cross-sectional view of another light management assembly provided by an embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of another light management assembly provided by an embodiment of the present invention;

FIG. 10 is a schematic cross-sectional view of another light management assembly according to an embodiment of the present invention;

fig. 11 is a schematic flow chart of a 3D printing method according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

An embodiment of the present invention provides a 3D printing apparatus, referring to fig. 1, including: a light source 1, a light control assembly 2, a liquid resin tank 3, a moving member 4, and a controller 5.

Wherein, this light control assembly 2 sets up between light source 1 and liquid resin hold tank 3, and moving member 4 sets up in this liquid resin holds tank 3, and just with this light control assembly 2 dead against position department, leaves the clearance between at least one inner wall of this moving member 4 and this liquid resin hold tank 3, and this moving member 4 is configured to move under the control of this controller 5 to form the liquid resin layer in one side that this moving member 4 is close to this light control assembly 2.

The light control assembly 2 is used for controlling the luminous flux of light emitted by the light source 1 so as to expose and cure the liquid resin layer, the uncured liquid resin layer is removed, and a 3D printing pattern is formed on the liquid resin layer.

The moving member 4 continuously moves under the control of the controller 5, so that a liquid resin layer can be continuously formed on the surface of the 3D printing pattern, and the liquid resin layer is irradiated layer by layer, cured and finally stacked into a 3D model.

The moving member 4 may be a lifting table, and thus the light control assembly 2 is disposed above the liquid resin tank 3, and the lifting table is controlled by the controller 5 to move up and down to form a liquid resin layer facing the light control assembly 2 above the lifting table.

In the case of a liquid crystal display panel as a light control component, the accuracy of a 3D printed pattern depends on the image display accuracy of the liquid crystal display panel.

In one embodiment of the present invention, as shown in fig. 1, the light control assembly 2 includes a first liquid crystal panel 21 and a second liquid crystal panel 22 which are stacked. As shown in fig. 1, 2 and 3, the first liquid crystal panel 21 includes a plurality of first sub-pixels P1, the second liquid crystal panel 22 includes a plurality of second sub-pixels P2, and an orthogonal projection of each boundary of the first sub-pixels P1 is located within an orthogonal projection enclosing region of a boundary of at least one second sub-pixel P2 in a thickness direction of the first liquid crystal panel 21 and the second liquid crystal panel 22; the orthographic projection of the first sub-pixel P1 and the orthographic projection of at least two second sub-pixels P2 are partially overlapped.

The specific structures of the first liquid crystal panel 21 and the second liquid crystal panel 22 are not limited.

Alternatively, as shown in fig. 4, the first liquid crystal panel 21 and the second liquid crystal panel 22 both have a display area a and a peripheral area S for wiring, and in addition, the gate driving circuit may be disposed in the peripheral area S. Fig. 5 illustrates the display area a surrounded by the peripheral area S.

Here, in the case where fig. 4 is a schematic view of the first liquid crystal panel 21, the display area a is provided with a plurality of first sub-pixels P1 accordingly. In the case where fig. 3 is a schematic view of the second liquid crystal panel 22, accordingly, the display region a is provided with a plurality of second sub-pixels P2. The above is only a schematic diagram when the first liquid crystal panel 21 and the second liquid crystal panel 22 are independently provided, and the relative positional relationship between the first subpixel P1 and the second subpixel P2 is not limited. As can be understood by those skilled in the art, in the embodiment of the present invention, by appropriately setting the shapes and positions of the first sub-pixel P1 and the second sub-pixel P2, the forward projection of each boundary of the first sub-pixel P1 can be located in the forward projection enclosing region of the boundary of at least one second sub-pixel P2; the orthographic projection of the first sub-pixel P1 and the orthographic projection of at least two second sub-pixels P2 are partially overlapped.

Alternatively, as shown in fig. 1, each of the first and second

liquid crystal panels

21 and 22 includes an array substrate 100, a counter substrate 200, and a liquid crystal layer 300 disposed between the array substrate 100 and the counter substrate 200.

As for the first and second

liquid crystal panels

21 and 22, as shown in fig. 5, the array substrate 100 is provided with a Thin-film transistor (TFT) 10 and a pixel electrode 20 on the second substrate 310 at each of the first and second sub-pixels P1 and P2. The thin film transistor 10 includes an active layer, a source electrode, a drain electrode, a Gate electrode (Gate), and a Gate insulating layer (GI), the source electrode and the drain electrode are respectively in contact with the active layer, and the pixel electrode 20 is electrically connected to the drain electrode of the thin film transistor 10. In some embodiments, the array substrate 100 further includes a common electrode 30 disposed on the second substrate 310. The pixel electrode 20 and the common electrode 30 may be disposed at the same layer, in which case the pixel electrode 20 and the common electrode 30 are each a comb-tooth structure including a plurality of strip-shaped sub-electrodes. As shown in fig. 5, the pixel electrode 20 and the common electrode 30 may be disposed at different layers. In other embodiments, the array substrate 100 further includes a gate line and a data line, and the gate electrode of the thin film transistor 10 is electrically connected to the gate line and the source electrode is electrically connected to the data line. The thin film transistor 10 on the array substrate 100 is used to control whether a signal is applied to the pixel electrode 20, when a signal is input to the gate line, the thin film transistor 10 connected to the gate line is turned on, and a signal on the data line is applied to the pixel electrode 20 through the turned-on thin film transistor 10.

It should be noted that, for the first liquid crystal panel 21 and the second liquid crystal panel 22, unlike the existing liquid crystal display panel, the first liquid crystal panel 21 and the second liquid crystal panel 22 only need to adjust the luminous flux to obtain a pattern to be printed, and the color of the pattern to be printed is not limited.

Based on this, the first liquid crystal panel 21 and the second liquid crystal panel 22 may not include a color filter. That is, the first liquid crystal panel 21 and the second liquid crystal panel 22 display gray-scale images, that is, in the embodiment of the present invention, the first liquid crystal panel 21 and the second liquid crystal panel 22 only display bright states and dark states.

In the embodiment of the present invention, by providing the first liquid crystal panel 21 and the second liquid crystal panel 22, since the orthographic projection of each boundary of the first sub-pixel P1 of the first liquid crystal panel 21 is located in the orthographic projection enclosing region of the boundary of at least one second sub-pixel P2 of the second liquid crystal panel 22, and the orthographic projection of the first sub-pixel P1 is partially overlapped with the orthographic projections of at least two second sub-pixels P2, when performing 3D printing, on one hand, by controlling the driving voltage of the second sub-pixel P2, the phase of the light passing through the first sub-pixel P1 can be finely adjusted by the deflection of the liquid crystal molecules in the second sub-pixel P2, so that the image display accuracy of the first liquid crystal panel 21 can be improved, and the 3D printing accuracy can be further improved.

On the other hand, compared with the method of adjusting the light emitted by the light source through one liquid crystal display panel (such as the first liquid crystal panel 21), so that the first liquid crystal panel 21 displays the image corresponding to the pattern to be printed, the light intensity at the position corresponding to the boundary of the image displayed by the first liquid crystal panel 21 and the pattern to be printed is stronger, which is not beneficial to improving the 3D printing precision. In the embodiment of the present invention, as shown in fig. 1 and 3, by additionally providing the second liquid crystal panel 22, when performing 3D printing, the second sub-pixel P2 is controlled, and for each first sub-pixel P1 corresponding to the boundary of the pattern to be printed, the phase of the light passing through the partial boundary position of the first sub-pixel P1 is inverted with respect to the phase of the light passing through the remaining boundary position of the first sub-pixel P1, that is, the light passing through the remaining boundary position of the first sub-pixel P1 is kept at the original phase, and the difference in phase causes light intensity cancellation, so that the light intensity at the position corresponding to the boundary of the pattern to be printed can be reduced, a better image boundary can be obtained, and the 3D printing accuracy can be effectively improved. Here, a partial boundary of the first subpixel P1 may be all boundaries of the first subpixel P1 corresponding to the boundaries of the pattern to be printed, and at this time, the remaining boundaries of the first subpixel P1 are the remaining boundaries of the first subpixel P1 except all boundaries corresponding to the boundaries of the pattern to be printed, accordingly.

In this regard, as shown in fig. 1 and 3, for example, assuming that, when performing 3D printing, all the first sub-pixels P1 of the first liquid crystal panel 21, which display an image corresponding to a pattern to be printed, are the first sub-pixels P1 surrounded by a thick line frame in fig. 3, and for each first sub-pixel P1 surrounded by a thick line frame, all the boundaries of each first sub-pixel P1 corresponding to the boundaries of the pattern to be printed, that is, all the boundaries overlapped with the thick line frame, taking one of the first sub-pixels P1 (shown as the first sub-pixel P1 located above the leftmost side in the thick line frame in fig. 3) as an example, the controller 5 controls the second sub-pixel P2 so that the phases of light rays passing through all the positions corresponding to all the boundaries overlapped with the thick line frame in the first sub-pixels P1 are inverted with respect to the remaining positions except all the boundaries overlapped with the thick line frame in the first sub-pixels P1, the light ray a 'is obtained, that is, the light rays passing through the positions corresponding to the remaining boundaries of the first sub-pixel P1 except all the boundaries overlapped by the thick line frame are kept at the original phase, for example, the light ray a is obtained, the light intensity of the light rays passing through the upper boundary and the left boundary of the first sub-pixel P1 can be reduced due to the fact that the phase difference between the light ray a and the light ray a' is 180 degrees and the light intensity is offset due to the phase difference, and the remaining first sub-pixels P1 are similar to the control method of the first sub-pixel P1, so that the light intensity of the light rays passing through the boundary of the image displayed by the first liquid crystal panel 21 can be reduced, a better image boundary can be obtained, and the 3D printing precision can be effectively.

The controller 5 is specifically configured to control the driving voltage of the first partial second sub-pixel P2, as shown in fig. 3, to make all the positions corresponding to the boundaries of the thick line frame in the first sub-pixel P1 (i.e., the partial boundaries of the first sub-pixel P1 mentioned above) opaque, i.e., corresponding to the display dark state (as shown by the dashed line a' in fig. 1), for each first sub-pixel P1 corresponding to the boundaries of the pattern to be printed, and to make the rest of the positions corresponding to the boundaries of the first sub-pixel P1 except all the boundaries overlapping with the thick line frame transparent, i.e., corresponding to the display bright state (as shown by the solid line a in fig. 1); the boundary light intensity contrast of the pattern to be printed is kept, so that a better image boundary can be obtained, and the 3D printing precision is improved. The first partial second subpixel P2 is all the second subpixels P2 located in an area surrounded by the orthogonal projections of all the boundaries of the second subpixel P2, which are overlapped with the thick frame in the orthogonal projections of all the boundaries of the first subpixel P1 in the thickness direction of the first liquid crystal panel 21 and the second liquid crystal panel 22. As shown in fig. 3, the first and second subpixels P2 are each shown by a thick dotted line.

In practical applications, the controller 5 controls the driving voltage of the first portion of the second sub-pixels P2, so that, for each first sub-pixel P1 corresponding to the boundary of the pattern to be printed, all the positions corresponding to the boundaries overlapping with the thick line frame in the first sub-pixel P1 are opaque, and the positions corresponding to the remaining boundaries except all the boundaries overlapping with the thick line frame in the first sub-pixel P1 are transparent, and meanwhile, the remaining second sub-pixels P2 except the first portion of the second sub-pixels P2 in the second sub-pixel P2 are turned on, so that all the light is transparent, and the remaining second sub-pixels P2 except the first portion of the second sub-pixels P2 in the second sub-pixel P2 are turned off.

In an embodiment of the invention, the controller 5 is further configured to control the remaining second sub-pixels P2 of the plurality of second sub-pixels P2 except the first-portion second sub-pixel P2 to be turned off while controlling the driving voltage of the first-portion second sub-pixel P2. That is, by transparently displaying the positions corresponding to the remaining boundaries of the first subpixel P1 except for all the boundaries overlapping with the thick line frame, the positions corresponding to the remaining boundaries of the first subpixel P1 except for all the boundaries overlapping with the thick line frame can be kept transparent, and power can be saved.

In the thickness direction of the first liquid crystal panel 21 and the second liquid crystal panel 22, as shown in fig. 3, the orthographic projection of each boundary of the first sub-pixel P1 may be located in the orthographic projection enclosing region of the boundary of one second sub-pixel P2, or as shown in fig. 6, the orthographic projection of each boundary of the first sub-pixel P1 may be located in the orthographic projection enclosing region of the boundary of two second sub-pixels P2.

Accordingly, in the thickness direction of the first and second

liquid crystal panels

21 and 22, as shown in fig. 3, the front projection of the first sub-pixel P1 may partially overlap the front projections of two adjacent second sub-pixels P2, or as shown in fig. 2, the front projection of the first sub-pixel P1 may partially overlap the front projections of three adjacent second sub-pixels P2.

In an embodiment of the invention, as shown in fig. 3, along the thickness direction of the first liquid crystal panel 21 and the second liquid crystal panel 22, the orthographic projection of each boundary of the first sub-pixel P1 is located in the orthographic projection enclosing region of the boundary of one second sub-pixel P2, and the orthographic projection of the first sub-pixel P1 is partially overlapped with the orthographic projections of two adjacent second sub-pixels P2.

The shapes of the first sub-pixel P1 and the second sub-pixel P2 are not limited in particular.

In one embodiment of the present invention, as shown in fig. 3, each of the first sub-pixels P1 has a rectangular shape; each second subpixel P2 is prismatic in shape; the orthographic projection of the first sub-pixel P1 and the orthographic projection of the four second sub-pixels P2 are partially overlapped.

That is, along the thickness direction of the first liquid crystal panel 21 and the second liquid crystal panel 22, the orthographic projections of two vertexes of one prism shape are respectively overlapped with the orthographic projections of the centers of two adjacent rectangles; the orthographic projections of the other two vertices of a prism overlap with the orthographic projections of the two end points of the boundary between two adjacent rectangles.

In the embodiment of the present invention, in the thickness direction of the first liquid crystal panel 21 and the second liquid crystal panel 22, the orthographic projections of the first sub-pixel P1 and the second sub-pixel P2 completely overlap, and compared with the orthographic projection of the first sub-pixel P1 and the orthographic projection of the second sub-pixel P2 partially overlap, the resolution of the image displayed by the first liquid crystal panel 21 can be increased as a whole, and the 3D printing accuracy can be further improved.

In yet another alternative embodiment of the present invention, as shown in fig. 7 and 8, the light management assembly 2 further includes a first polarizer 23 and a second polarizer 24, wherein the absorption axis of the first polarizer 23 is perpendicular to the absorption axis of the second polarizer 24; in the first case, as shown in fig. 7, the first polarizing plate 23 and the second polarizing plate 24 are respectively disposed on both sides of the first liquid crystal panel 21 and the second liquid crystal panel 22 away from each other. In the second case, as shown in fig. 8, the first polarizing plate 23 and the second polarizing plate 24 are disposed on opposite sides of the first liquid crystal panel 21 away from and close to the second liquid crystal panel 22, respectively.

In the first case, the first polarizer 23 and the second polarizer 24 may be respectively attached to two side surfaces of the first liquid crystal panel 21 and the second liquid crystal panel 22, which are far away from each other, through transparent adhesive layers. In the second case, the first polarizer 23 and the second polarizer 24 may be respectively attached to two opposite side surfaces of the first liquid crystal panel 21 away from and close to the second liquid crystal panel 22 by transparent adhesive layers.

In the second case, as shown in fig. 8, one of the first polarizer 23 and the second polarizer 24 is attached to one of the surfaces of the first liquid crystal panel 21 close to the second liquid crystal panel 22, and may be attached to one of the surfaces of the second liquid crystal panel 22 close to the first liquid crystal panel 21 through a transparent adhesive layer.

In another embodiment of the present invention, as shown in fig. 9 and 10, the light control assembly 2 further includes a third polarizer 25, the third polarizer 25 is disposed between the sides of the second liquid crystal panel 22 close to the first liquid crystal panel 21, and the absorption axis of the third polarizer 25 is perpendicular to the absorption axis of one of the first polarizer 23 and the second polarizer 24 far from the second liquid crystal panel 22.

By providing the third polarizer 25, light leakage of light emitted from the first liquid crystal panel 21 can be prevented, and light utilization efficiency can be improved.

The embodiment of the invention provides a 3D printing method, which is applied to the 3D printing device; referring to fig. 11, the 3D printing method includes:

and S1, turning on the light source.

Wherein, the light emitted by the light source can be ultraviolet light with the wavelength range of 450 and 480 nm.

S2, displaying an image corresponding to the pattern to be printed on the first liquid crystal panel.

S3, as shown in fig. 1 and 3, all the first sub-pixels P1 of the first liquid crystal panel 21 displaying the image corresponding to the pattern to be printed are acquired, and all the first sub-pixels P1 corresponding to the boundary of the pattern to be printed and the boundary of each first sub-pixel P1 corresponding to the boundary of the pattern to be printed are determined according to the correspondence between each first sub-pixel P1 of the first liquid crystal panel 21 displaying the image corresponding to the pattern to be printed and the pattern to be printed.

As shown in fig. 3, it is assumed that, when performing 3D printing, all the first sub-pixels P1 of the first liquid crystal panel 21 that display an image corresponding to a pattern to be printed are the first sub-pixels P1 surrounded by a thick line frame in fig. 3, and for each first sub-pixel P1 surrounded by a thick line frame, all the boundaries of each first sub-pixel P1 corresponding to the boundaries of the pattern to be printed are all the boundaries that overlap with the thick line frame, and taking one of the first sub-pixels P1 (shown as the first sub-pixel P1 located at the leftmost upper side of the thick line frame in fig. 3) as an example, the boundaries of the first sub-pixels P1 corresponding to the boundaries of the pattern to be printed are the upper and left boundaries of the first sub-pixels P1.

S4, controlling the second sub-pixel P2 in the second liquid crystal panel 22, and for each first sub-pixel P1 corresponding to the boundary of the pattern to be printed, phase-inverting the light passing through the partial boundary position of the first sub-pixel P1 with respect to the light passing through the rest of the boundary positions of the first sub-pixels P1 to obtain the pattern to be printed; among them, part of the boundaries of the first subpixel P1 are all of the boundaries of the first subpixel P1 corresponding to the boundaries of the pattern to be printed (e.g., all of the boundaries overlapping with the thick line frame in fig. 3), and the remaining boundaries of the first subpixel P1 are the remaining boundaries of the first subpixel P1 (e.g., the boundaries not overlapping with the thick line frame in fig. 3) except for all of the boundaries corresponding to the boundaries of the pattern to be printed.

With reference to fig. 3, specifically, the driving voltage of the first partial second sub-pixel P2 is controlled, and for each first sub-pixel P1 corresponding to the boundary of the pattern to be printed, all the positions corresponding to the boundaries of the first sub-pixel P1 that overlap the thick frame are made opaque, and the positions corresponding to the remaining boundaries of the first sub-pixel P1 except all the boundaries that overlap the thick frame are made transparent; the first portion of the second subpixels P2 are all the second subpixels P2, which are located in the area surrounded by the orthogonal projections of all the boundaries of the second subpixel P2, in the thickness direction of the first liquid crystal panel 21 and the second liquid crystal panel 22, where the orthogonal projections of all the boundaries of the first subpixel P1 overlapped with the thick frame are located, and as shown in fig. 3, the first portion of the second subpixels P2 are all shown by thick broken lines.

By making all the boundaries of the first sub-pixel P1 overlapped with the thick frame opaque, i.e. corresponding to the display dark state, the remaining boundaries of the first sub-pixel P1 except all the boundaries overlapped with the thick frame are made transparent, i.e. corresponding to the display bright state; the boundary light intensity contrast of the pattern to be printed can be kept, so that a better image boundary can be obtained, and the 3D printing precision is improved.

And S5, exposing and curing the liquid resin layer through the pattern to be printed.

The 3D printing method provided by the embodiment of the invention has the same technical effects as the 3D printing device provided by the embodiment of the invention, and details are not repeated herein.

The form of the liquid resin layer is not particularly limited.

In an embodiment of the present invention, as shown in fig. 1, in a case where the 3D printing apparatus further includes a liquid resin tank 3 and a moving member 4, before exposing and curing the liquid resin layer by a pattern to be printed, the 3D printing method further includes: liquid resin is added into the liquid resin containing groove 3, the moving piece 4 is controlled to move in the liquid resin containing groove, and the liquid resin layer is formed on one side, close to the light control assembly 2, of the moving piece 4.

It should be noted that the above embodiment is a case where the 3D printing model includes one layer of 3D printing pattern.

With continued reference to fig. 1, in a case where the 3D printing model includes a plurality of layers of 3D printing patterns, and a layer of 3D printing patterns is formed, the 3D printing method may further include: controlling the moving member 4 to move in the liquid resin containing groove 3, continuously forming the ith liquid resin layer on one side of the moving member 4 close to the light control assembly 2, and repeating the following steps: s2, the first liquid crystal panel 21 is caused to display an image corresponding to the pattern to be printed. S3, acquiring all first sub-pixels P1 of the first liquid crystal panel 21 displaying an image corresponding to the pattern to be printed, and determining all first sub-pixels P1 corresponding to the boundary of the pattern to be printed and the boundary of each first sub-pixel P1 corresponding to the boundary of the pattern to be printed according to the correspondence between each first sub-pixel P1 of the first liquid crystal panel 21 displaying an image corresponding to the pattern to be printed and the pattern to be printed. S4, controlling the second sub-pixel P2 in the second liquid crystal panel 22, and for each first sub-pixel P1 corresponding to the boundary of the pattern to be printed, causing the phase of the light passing through the partial boundary position of the first sub-pixel P1 to be reversed with respect to the light passing through the rest of the boundary positions of the first sub-pixel 1, so as to obtain the pattern to be printed; wherein part of the boundaries of the first subpixel P1 are all the boundaries of the first subpixel P1 corresponding to the boundaries of the pattern to be printed, and the remaining boundaries of the first subpixel P1 are the remaining boundaries of the first subpixel P1 except all the boundaries corresponding to the boundaries of the pattern to be printed. And S5, exposing and curing the ith liquid resin layer through the pattern to be printed. Wherein i is a natural number greater than or equal to 2, and the value of i is added with 1 every time the operation is repeated.

And forming a 3D printing model with a plurality of layers of 3D printing patterns by exposing and curing layer by layer.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A light management assembly comprising a first liquid crystal panel and a second liquid crystal panel arranged in a stack;

the first liquid crystal panel comprises a plurality of first sub-pixels;

the second liquid crystal panel comprises a plurality of second sub-pixels, and the orthographic projection of each boundary of the first sub-pixels is positioned in the orthographic projection enclosing region of the boundary of at least one second sub-pixel along the thickness direction of the first liquid crystal panel and the second liquid crystal panel; the orthographic projection of the first sub-pixel and the orthographic projection of at least two second sub-pixels are partially overlapped.

2. The light control assembly according to claim 1, wherein the light control assembly comprises a light source,

in the thickness direction of the first liquid crystal panel and the second liquid crystal panel, the orthographic projection of each boundary of the first sub-pixel is positioned in an orthographic projection enclosed area of the boundary of one second sub-pixel; the orthographic projection of the first sub-pixel is partially overlapped with the orthographic projection of each of two adjacent second sub-pixels.

3. The light control assembly according to claim 2,

each first sub-pixel is rectangular in shape;

each second sub-pixel is in a prismatic shape;

the orthographic projection of the first sub-pixel and the orthographic projection of the four second sub-pixels are partially overlapped.

4. The light control assembly according to claim 1, wherein the light control assembly comprises a light source,

the light control assembly further comprises a first polarizer and a second polarizer, and the absorption axis of the first polarizer is perpendicular to the absorption axis of the second polarizer;

the first polarizer and the second polarizer are respectively arranged at two sides of the first liquid crystal panel and the second liquid crystal panel which are far away from each other;

or the first polaroid and the second polaroid are respectively arranged at two opposite sides of the first liquid crystal panel, which are far away from and close to the second liquid crystal panel.

5. The light control assembly according to claim 4,

the light control assembly further comprises a third polaroid, the third polaroid is arranged between one sides, close to the first liquid crystal panel, of the second liquid crystal panel, and an absorption axis of the third polaroid is perpendicular to an absorption axis of one of the first polaroid and the second polaroid, which is far away from the second liquid crystal panel.

6. A 3D printing apparatus comprising a light source and a light control assembly according to any of claims 1 to 5, and a controller;

the first liquid crystal panel in the light control assembly is arranged close to the light source relative to the second liquid crystal panel;

the first liquid crystal panel is used for displaying an image corresponding to a pattern to be printed;

the controller is used for acquiring all first sub-pixels which are used for displaying the image corresponding to the pattern to be printed in the first liquid crystal panel, and determining all first sub-pixels which correspond to the boundary of the pattern to be printed and the boundary of each sub-pixel which corresponds to the boundary of the pattern to be printed according to the corresponding relation between each first sub-pixel which is used for displaying the image corresponding to the pattern to be printed in the first liquid crystal panel and the pattern to be printed;

controlling the driving voltage of the second sub-pixel, and for each first sub-pixel corresponding to the boundary of the pattern to be printed, enabling the phase of light rays passing through the partial boundary positions of the first sub-pixels to be reversed relative to light rays passing through the rest boundary positions of the first sub-pixels, so as to obtain the pattern to be printed; wherein, the partial boundary of the first sub-pixel is all boundaries corresponding to the boundary of the pattern to be printed in the first sub-pixel, and the rest boundaries of the first sub-pixel are the rest boundaries except all boundaries corresponding to the boundary of the pattern to be printed in the first sub-pixel.

7. The 3D printing device according to claim 6,

the controller is specifically configured to control the driving voltage of the first part of the second sub-pixels, and for each first sub-pixel corresponding to the boundary of the pattern to be printed, the controller is configured to make part of the boundary positions of the first sub-pixels opaque, and make the rest of the boundary positions of the first sub-pixels transparent; the first part of second sub-pixels are all second sub-pixels in the area enclosed by the orthographic projections of the partial boundaries of the first sub-pixels and the orthographic projections of the boundaries of the second sub-pixels along the thickness direction of the first liquid crystal panel and the second liquid crystal panel.

8. The 3D printing device according to claim 7,

the controller is further used for controlling the driving voltage of the first part of second sub-pixels and controlling the rest of the second sub-pixels except the first part of second sub-pixels in the plurality of second sub-pixels to be turned off.

9. The 3D printing device according to any of claims 6-8,

the device also comprises a liquid resin containing groove and a moving part;

the liquid resin containing groove is arranged on one side, far away from the first liquid crystal panel, of the second liquid crystal panel, the moving piece is arranged in the liquid resin containing groove and is in a position right opposite to the second liquid crystal panel, and a gap is reserved between the moving piece and at least one inner wall of the liquid resin containing groove; the moving member is configured to move under the control of the controller to form a liquid resin layer on a side close to the second liquid crystal panel.

10. A 3D printing method, characterized by being applied to the 3D printing apparatus according to any one of claims 6 to 9; the 3D printing method comprises the following steps:

turning on a light source;

enabling the first liquid crystal panel to display an image corresponding to a pattern to be printed;

acquiring all first sub-pixels displaying an image corresponding to a pattern to be printed in the first liquid crystal panel, and determining all first sub-pixels corresponding to the boundary of the pattern to be printed and the boundary of each first sub-pixel corresponding to the boundary of the pattern to be printed according to the corresponding relation between each first sub-pixel displaying the image corresponding to the pattern to be printed in the first liquid crystal panel and the pattern to be printed;

controlling second sub-pixels in the second liquid crystal panel, and for each first sub-pixel corresponding to the boundary of the pattern to be printed, enabling light rays passing through the partial boundary positions of the first sub-pixels to be subjected to phase reversal relative to light rays passing through the rest boundary positions of the first sub-pixels, so as to obtain the pattern to be printed; wherein, the partial boundary of the first sub-pixel is all boundaries corresponding to the boundary of the pattern to be printed in the first sub-pixel, and the rest boundaries of the first sub-pixel are the rest boundaries except all boundaries corresponding to the boundary of the pattern to be printed in the first sub-pixel;

and exposing and curing the liquid resin layer through the pattern to be printed.

11. The 3D printing method according to claim 10,

controlling second sub-pixels in the second liquid crystal panel, and for each first sub-pixel corresponding to the boundary of the pattern to be printed, causing the phase of light passing through the partial boundary position of the first sub-pixel to be reversed relative to light passing through the rest boundary positions of the first sub-pixels, including:

controlling the driving voltage of the first part of second sub-pixels, and enabling part of boundary positions of the first sub-pixels to be opaque and the rest of boundary positions of the first sub-pixels to be transparent aiming at each first sub-pixel corresponding to the boundary of the pattern to be printed; the first part of second sub-pixels are all second sub-pixels in the area enclosed by the orthographic projections of the partial boundaries of the first sub-pixels and the orthographic projections of the boundaries of the second sub-pixels along the thickness direction of the first liquid crystal panel and the second liquid crystal panel.

12. The 3D printing method according to claim 11,

controlling the driving voltage of the first part of the second sub-pixels, and aiming at each first sub-pixel corresponding to the boundary of the pattern to be printed, enabling part of the boundary positions of the first sub-pixels to be opaque, and enabling the rest of the boundary positions of the first sub-pixels to be transparent, wherein the 3D printing method further comprises the following steps:

and controlling the rest second sub-pixels except the first part of second sub-pixels in the plurality of second sub-pixels to be closed.

13. The 3D printing method according to any of claims 10-12, wherein the 3D printing device further comprises a liquid resin receiving slot and a moving member;

before exposing and curing the liquid resin layer through the pattern to be printed, the 3D printing method further includes: and adding liquid resin into the liquid resin containing groove, controlling the moving member to move in the liquid resin containing groove, and forming a liquid resin layer on one side of the moving member, which is close to the light control assembly.