KR102248644B1 - 3D printer and Liquid crystal emitting device for the same - Google Patents

Abstract

The present invention, a liquid crystal panel; A first light source emitting light of a first wavelength and a second light source emitting light of a second wavelength shorter than the first wavelength, and including a backlight unit located under the liquid crystal panel, the first light source And the second light source provides a liquid crystal light emitting device for a 3D printer driven by time division and a 3D printer using the same.

Description

3D printer and liquid crystal emitting device for 3D printer TECHNICAL FIELD

The present invention relates to a 3D printer, and more particularly, to a 3D printer capable of printing an output with improved three-dimensional effect, and a liquid crystal light emitting device for a 3D printer.

A 3D printer refers to a device capable of forming a three-dimensional shape to be formed by a printing technique.

For example, SLA (Stereo Lithography Apparatus) 3D printers using the principle of curing the photocurable resin by scanning a laser beam on the photocurable resin have been used. That is, a laser beam corresponding to the cross section of the sculpture is irradiated to the photocurable resin to form a cured layer, and the formed cured layers are sequentially stacked to complete the output.

However, since a laser irradiation apparatus for irradiating a laser beam is very expensive and has a large volume, the price of a 3D printer using a general laser irradiation apparatus increases and the occupied space increases.

In addition, the intensity of the laser beam is adjusted to give a three-dimensional effect to the output, but there is a limit to the formation of a three-dimensional effect by adjusting the intensity.

The present invention aims to solve the limitations of 3D printers in terms of high price, large occupied space, and three-dimensional effect.

In order to solve the above problems, the present invention includes a liquid crystal panel; A first light source emitting light of a first wavelength and a second light source emitting light of a second wavelength shorter than the first wavelength, and including a backlight unit located under the liquid crystal panel, the first light source And the second light source provides a liquid crystal light emitting device for a 3D printer that is time-division driven.

In addition, the present invention, and a water tank containing a photo-curable resin; A platform disposed above the water tank and capable of vertical movement; It provides a 3D printer including the above-described liquid crystal light emitting device for a 3D printer located under the water tank.

The liquid crystal light emitting device for a 3D printer of the present invention includes a backlight unit including a first light source of a first wavelength and a second light source of a second wavelength, The main curing process can improve the three-dimensional effect of the 3D printer output.

In addition, since the difference between the first wavelength and the second wavelength is 15 nm or more, the temporary curing process does not affect the curing process, and thus the three-dimensional effect is further improved.

Furthermore, the number of second light sources having a shorter wavelength is provided than that of the first light source, and thus, the efficiency of the main curing process can be improved.

In addition, since an inexpensive, thin liquid crystal light emitting device is used as a light source of a 3D printer by replacing an expensive UV irradiation device, it is possible to reduce the cost of the 3D printer and reduce the occupied space.

In addition, unlike a general liquid crystal light emitting device, power consumption of a 3D printer can be lowered by omitting a color filter to increase luminance.

1 is a schematic view for explaining a 3D printer using a liquid crystal light emitting device according to the present invention.
2 is a schematic cross-sectional view of a liquid crystal light emitting device for a 3D printer according to a first embodiment of the present invention.
3 is a schematic cross-sectional view of a liquid crystal panel in a liquid crystal light emitting device for a 3D printer of the present invention.
4 is a schematic cross-sectional view of a liquid crystal light emitting device for a 3D printer according to a second embodiment of the present invention.
5A to 5E are views for explaining an arrangement of light sources in a liquid crystal light emitting device for a 3D printer according to a second embodiment of the present invention.
6 is a schematic cross-sectional view of a liquid crystal light emitting device for a 3D printer according to a third embodiment of the present invention.
7 is a view for explaining an arrangement of light sources in a liquid crystal light emitting device for a 3D printer according to a third embodiment of the present invention.

The present invention, a liquid crystal panel; A first light source emitting light of a first wavelength and a second light source emitting light of a second wavelength shorter than the first wavelength, and including a backlight unit located under the liquid crystal panel, the first light source And the second light source provides a liquid crystal light emitting device for a 3D printer that is time-division driven.

In the liquid crystal light emitting device for a 3D printer of the present invention, the first wavelength is 425 to 435 nm, and the second wavelength is 400 to 410 nm.

In the liquid crystal light emitting device for a 3D printer of the present invention, the number of the second light sources is greater than the number of the first light sources.

In the liquid crystal light emitting device for a 3D printer of the present invention, the backlight unit further includes a light guide plate positioned under the liquid crystal panel, and the first and second light sources alternately along the width direction of the light guide plate from one side of the light guide plate. Are arranged.

In the liquid crystal light emitting device for a 3D printer of the present invention, the backlight unit further includes a light guide plate positioned under the liquid crystal panel, and any one of the first and second light sources is arranged in a lower area of one side of the light guide plate, and the The other of the first and second light sources is arranged in an upper area of one side of the light guide plate.

In the liquid crystal light emitting device for a 3D printer of the present invention, the first and second light sources are arranged alternately.

In the liquid crystal light emitting device for a 3D printer of the present invention, one of the first and second light sources is further arranged in an upper area of the other side of the light guide plate, and the other of the first and second light sources is a lower part of the other side of the light guide plate. Are further arranged in the area.

In the liquid crystal light emitting device for a 3D printer of the present invention, the backlight unit further includes a light guide plate positioned below the liquid crystal panel, and the first light source is arranged along a width direction of the light guide plate at one side of the light guide plate, and the The second light source is arranged on both sides of the first light source along the width direction of the light guide plate from one side of the light guide plate.

In the liquid crystal light emitting device for a 3D printer of the present invention, the backlight unit further includes a light guide plate positioned under the liquid crystal panel, and the second light source is spaced apart from each other in an upper area and a lower area of the light guide plate from one side of the light guide plate. And the first light source is positioned corresponding to the space between the second light sources on the other side of the light guide plate.

In the liquid crystal light emitting device for a 3D printer of the present invention, one first light source is disposed between a pair of the second light sources to form a group, and the group is repeatedly arranged under the liquid crystal panel.

In another aspect, the present invention, and a water tank containing a photocurable resin; A platform disposed above the water tank and capable of vertical movement; It provides a 3D printer including the above-described liquid crystal light emitting device for a 3D printer located under the water tank.

Hereinafter, a preferred embodiment according to the present invention will be described with reference to the drawings.

1 is a schematic view for explaining a 3D printer using a liquid crystal light emitting device according to the present invention.

As shown in FIG. 1, the 3D printer 100 includes a water tank 110 containing a photocurable resin 112, a platform 120 having one end immersed in the photocurable resin 112 and capable of vertical movement. , And a liquid crystal light emitting device (LCD) disposed under the water tank 110 to supply light to the photocurable resin 112.

The water tank 110 is made of a transparent material through which light from a liquid crystal light emitting device (LCD) can be transmitted and has a larger width than the platform 120 so that one end of the platform 120 is It may be immersed in the chemical conversion resin 112.

The photocurable resin 112 contains a photoinitiator and forms a 2D cured layer on the platform 120 by light provided from the liquid crystal light emitting device (LCD), and the platform 120 is As it moves, the hardened layer is stacked to obtain a 3D output.

In the present invention, the 3D printer 100 uses a liquid crystal light emitting device (LCD) rather than a laser irradiation device, and accordingly, the price and occupied space of the 3D printer 100 are reduced.

2 is a schematic cross-sectional view of a liquid crystal light emitting device for a 3D printer according to a first embodiment of the present invention.

As shown in FIG. 2, the liquid crystal light emitting device (LCD) for a 3D printer according to the first embodiment of the present invention includes first and second substrates 212 and 214 bonded to each other through a liquid crystal layer (not shown). And, a liquid crystal panel 210 including first and second polarizing plates 272 and 274 positioned outside each of the first and second substrates 212 and 214, and disposed under the liquid crystal panel 210 And a backlight unit 280 including a light guide plate 282 and a light source 284 positioned at one side of the light guide plate 282.

Referring to FIG. 3, which is a schematic cross-sectional view of a liquid crystal panel in a liquid crystal light emitting device for a 3D printer of the present invention, the liquid crystal panel 210 includes first and second substrates 212 and 214 facing each other, and the first And a liquid crystal layer 260 interposed between the second substrates 212 and 214 and including liquid crystal molecules 262, a thin film transistor Tr, a pixel electrode 240, and a common electrode 242.

Specifically, a gate electrode 222 and a gate wire (not shown) connected to the gate electrode 222 and extending in one direction are formed on the first substrate 212. For example, each of the gate electrode 222 and the gate wiring may be made of a low-resistance metal such as copper or aluminum.

A gate insulating layer 224 is formed covering the gate electrode 222 and the gate wiring. For example, the gate insulating layer 224 may be made of an inorganic insulating material such as silicon oxide or silicon nitride.

A semiconductor layer 226 is formed on the gate insulating layer 224 to correspond to the gate electrode 222. The semiconductor layer 226 may be made of an oxide semiconductor material. Meanwhile, the semiconductor layer 226 may have a double layer structure including an active layer made of amorphous silicon and an ohmic contact layer made of impurity amorphous silicon.

A source electrode 230 and a drain electrode 232 spaced apart from each other are formed on the semiconductor layer 226. In addition, a data line (not shown) connected to the source electrode 230 crosses the gate line to define a pixel region. For example, each of the source electrode 230, the drain electrode 232, and the data line may be made of a low-resistance metal such as copper or aluminum.

The gate electrode 222, the semiconductor layer 226, the source electrode 230, and the drain electrode 232 constitute a thin film transistor Tr.

The thin film transistor Tr is an inverted staggered structure in which the gate electrode 222 is located under the semiconductor layer 226 and the source electrode 232 and the drain electrode 234 are located above the semiconductor layer 226. staggered) structure. Alternatively, the thin film transistor Tr may have a coplanar structure in which the gate electrode, the source electrode, and the drain electrode are positioned on the semiconductor layer.

A protective layer 234 having a drain contact hole 236 exposing the drain electrode 232 is formed on the thin film transistor Tr. For example, the protective layer 234 may be made of an organic insulating material such as photo-acrylic or an inorganic insulating material such as silicon oxide or silicon nitride.

On the passivation layer 234, a pixel electrode 240 connected to the drain electrode 232 through the drain contact hole 236 and a common electrode 242 alternately arranged with the pixel electrode 240 are provided. Is formed. For example, each of the pixel electrode 240 and the common electrode 242 has a bar shape and is indium-tin-oxide (ITO) or indium-zinc-oxide. -oxide, IZO) can be made of a transparent conductive material.

In contrast, one of the pixel electrode 240 and the common electrode 242 may have a plate shape and the other of them has an opening, and thus may have an electrode structure of a so-called fringe field switching mode. have. In addition, the pixel electrode 240 and the common electrode 242 may each have a plate shape, and the common electrode 242 may be formed on the second substrate 214.

In addition, a first alignment layer (not shown) for determining the initial arrangement of the liquid crystal molecules 262 is formed on the pixel electrode 240 and the common electrode 242.

A black matrix 252 is formed on the second substrate 214 to cover a non-emission area such as the thin film transistor Tr, the gate line, and the data line. In addition, a second alignment layer (not shown) for determining the initial arrangement of the liquid crystal molecules 262 is formed on the black matrix 252.

Since the liquid crystal light emitting device (LCD) of the present invention is used in a 3D printer, the liquid crystal panel 210 is not used to implement a color image. Accordingly, the liquid crystal panel 210 does not include a color filter and has improved luminance, and accordingly, the black matrix 252 contacts the second substrate 214 and the second alignment layer.

Meanwhile, when an overcoat layer is formed between the black matrix 252 and the second alignment layer, the black matrix 252 may contact the second substrate 214 and the overcoat layer.

In addition, when the black matrix 252 is omitted, the second alignment layer may contact the second substrate 214 and the liquid crystal layer 260.

The first and second substrates 212 and 214 are bonded with a liquid crystal layer 260 therebetween, and the liquid crystal layer 260 is formed by an electric field generated between the pixel electrode 240 and the common electrode 242. ) Of the liquid crystal molecules 262 is driven.

First and second polarizing plates 272 and 274 having transmission axes perpendicular to each other are attached to the outside of each of the first and second substrates 212 and 214.

Referring back to FIG. 2, the light guide plate 282 of the backlight unit 280 is disposed under the liquid crystal panel 282, and the light source 284 is located at one side of the light guide plate 284, and such a backlight unit 280 May be referred to as an edge type.

In this case, the light source 284 is a UV light source having a wavelength of 365 nm.

Referring again to FIG. 1, a photocurable resin 112 is contained in the water tank (110 in FIG. 1), and the photocurable resin 112 contains a photoinitiator, and the light provided from a liquid crystal light emitting device (LCD) As a result, a photocuring reaction occurs, and a 3D output is obtained.

This photoinitiator induces a photocuring reaction of the resin by light having a wavelength of 365 nm emitted from the light source 284. The liquid crystal light-emitting device (LCD) controls light irradiation and light intensity by adjusting an electric field between a pixel electrode (240 in FIG. 3) and a common electrode (242 in FIG. 3), thereby obtaining a 3D output.

As described above, the liquid crystal light emitting device 100 for a 3D printer of the present invention omits a color filter and uses a light source that emits UV light of 365 nm, so the price and space occupied by the 3D printer are reduced, and power consumption is also reduced. .

By the way, each of the first and second polarizing plates 272 and 274 of the liquid crystal panel 210 includes a polymer polarizer such as polyvinyl alcohol (PVA), and 365 nm wavelength light from the light source 284 is 2 A problem occurs in which most of the polarizing plates 272 and 274 are absorbed, and the driving voltage and power consumption of the liquid crystal light emitting device (LCD) of the 3D printer 100 increase.

4 is a schematic cross-sectional view of a liquid crystal light emitting device for a 3D printer according to a second embodiment of the present invention.

As shown in FIG. 4, a liquid crystal light emitting device (LCD) for a 3D printer according to a second embodiment of the present invention includes first and second substrates 312 and 314 bonded to each other through a liquid crystal layer (not shown). And, a liquid crystal panel 310 including first and second polarizing plates 372 and 374 positioned outside each of the first and second substrates 312 and 314, and disposed under the liquid crystal panel 310 And a first light source 382 that emits light of a first wavelength and is positioned at one side of the light guide plate 382 and the light guide plate 382 and a second light source 384 that emits light of a second wavelength shorter than the first wavelength. It includes a backlight unit 392 including a light source 386 composed of.

Referring to FIG. 3, the liquid crystal panel 210 is interposed between the first and second substrates 312 and 314 facing each other and the first and second substrates 312 and 314, and liquid crystal molecules ( A liquid crystal layer 260 including 262, a thin film transistor Tr, a pixel electrode 240, and a common electrode 242 are included.

The thin film transistor Tr is formed on the first substrate 312 and may include a gate electrode 222, a semiconductor layer 226, a source electrode 230, and a drain electrode 232, and the pixel The electrode 240 may be connected to the drain electrode 232. In addition, the common electrode 242 may be alternately arranged with the pixel electrode 240.

Further, the first and second polarizing plates 372 and 374 positioned outside each of the first and second substrates 312 and 314 have transmission axes perpendicular to each other.

The first and second light sources 382 and 384 are alternately arranged on the light source substrate 388 to form a light source assembly 390, and are positioned on at least one side of the light guide plate 380. For example, a separate light source assembly may be disposed to face the light source assembly 390.

Although not shown, the backlight unit 392 may further include a reflective plate positioned under the light guide plate 380 and an optical city positioned between the light guide plate 380 and the liquid crystal panel 310.

Further, the liquid crystal light emitting device LCD may further include a bottom frame covering the rear surface of the backlight unit 392 and a main frame covering the backlight unit 392 and side surfaces of the liquid crystal panel 310.

Each of the first and second light sources 382 and 384 may be a light emitting diode (LED), the first wavelength of the first light source 382 may be about 425 to 435 nm, and the second light source 384 The second wavelength of) may be about 400 to 410 nm. That is, the second wavelength may be shorter than the first wavelength, and a difference between the first wavelength and the second wavelength may be 15 nm or more.

The first light source 382 and the second light source 384 are time-division driven, and the first light source 382 is driven before the second light source 384.

Referring to Figure 1, the photocurable resin contained in the water tank 110 of the 3D printer 100 includes first and second photoinitiators, for example, the first photoinitiator is a sight by light of about 410 ~ 450nm. Induces a chemical reaction, and the second photoinitiator induces a photocuring reaction by light of about 395 to 410 nm. For example, the first photoinitiator may be Irgacure 815 or Irgacure 1331, and the second photoinitiator may be Irgacure 103 or Irgacure 121.

The first light source 382 is driven in a first section so that the light of the first wavelength is irradiated to the photocurable resin through the liquid crystal panel 210, and temporary curing by the first photoinitiator is performed. In addition, the second light source 384 is driven in a second section after the first section, so that the light of the second wavelength is irradiated to the photocurable resin through the liquid crystal panel 210, and Main curing is in progress.

As described above, most of the 365 nm wavelength light is absorbed by the first and second polarizing plates 372 and 374 of the liquid crystal panel 310. However, light of the first wavelength (425 to 435 nm) and the second wavelength (400 to 410 nm) emitted from the first and second light sources 382 and 384 is Since it is not absorbed, an increase in power consumption of the liquid crystal light emitting device (LCD) and the 3D printer 100 can be prevented.

In addition, since the photocurable resin is cured by the first and second light sources 382 and 384 driven by time division, the three-dimensional effect of the output is improved.

Moreover, since the difference between the first and second wavelengths of the first and second light sources 382 and 384 is 15 nm or more, the three-dimensional effect of the output can be further improved without interference by light of each wavelength.

5A to 5E are views for explaining an arrangement of light sources in a liquid crystal light emitting device for a 3D printer according to a second embodiment of the present invention.

5A, in the backlight unit 392, first and second light source assemblies 390a and 390b may be disposed on both sides of the light guide plate 380.

In this case, the first light source assembly 390a includes at least one first light source 382 disposed on a first light source substrate 388a, and the second light source assembly 390b includes a second light source substrate 388b. And at least one second light source 384 disposed in the. As described above, the first light source 382 may emit light of a first wavelength of about 425 to 435 nm, and the second light source 384 may emit light of a second wavelength of about 400 to 410 nm. .

That is, the first light source assembly 390a including only the first light source 382 and the second light source assembly 390b including only the second light source 384 are disposed on both sides of the light guide plate 380, and the first and The second light source assemblies 390a and 390b are time-division driven.

Referring to FIG. 5B, in the backlight unit 392, first and second light source assemblies 390a and 390b may be disposed on one side of the light guide plate 380.

That is, on one side of the light guide plate 380, the first light source assembly 390a is disposed to correspond to the lower area of the light guide plate 380, and the second light source assembly 390b is disposed to correspond to the upper area of the light guide plate 380. do. Alternatively, the first light source assembly 390a may be disposed to correspond to the upper region of the light guide plate 380, and the second light source assembly 390b may be disposed to correspond to the lower region of the light guide plate 380.

Also, the first and second light sources 382 and 384 arranged in a line may be formed on one light source substrate.

In FIG. 5B, it is shown that the first light source 382 of the first light source assembly 390a and the second light source 384 of the second light source assembly 390b correspond to each other. In contrast, since the first and second light sources 382 and 384 are alternately arranged, interference with each other can be minimized. That is, the first light source 382 may correspond to a space between adjacent second light sources 384.

As described above, the first light source 382 may emit light of a first wavelength of about 425 to 435 nm, and the second light source 384 may emit light of a second wavelength of about 400 to 410 nm. . In addition, the first and second light source assemblies 390a and 390b are time-division driven.

Referring to FIG. 5C, which is a cross-sectional view for explaining the arrangement of light sources in a liquid crystal light emitting device for a 3D printer, in the backlight unit 392, a pair of first and second light source assemblies 390a and 390b are on both sides of the light guide plate 380. Is placed in

That is, at one side of the light guide plate 380, the first light source assembly 390a including at least one first light source 382 disposed on the first light source substrate 388a and at least the second light source substrate 388b disposed on one side of the light guide plate 380 A second light source assembly 390b including one second light source 384 is an upper and lower light source assembly and is disposed to correspond to the upper and lower regions of the light guide plate 380, and a second light source assembly 390b is disposed on the other side of the light guide plate 380. The light source assembly 390b and the first light source assembly 390a are upper and lower light source assemblies and are disposed to correspond to upper and lower regions of the light guide plate 380.

In other words, a pair of first and second light source assemblies 390a and 390b are disposed on each side of the light guide plate 380, and the first light source assembly 390a and the second light source assembly 390b face each other. .

As described above, the first light source 382 may emit light of a first wavelength of about 425 to 435 nm, and the second light source 384 may emit light of a second wavelength of about 400 to 410 nm. . In addition, the first and second light source assemblies 390a and 390b are time-division driven.

Since the first and second light source assemblies 390a and 390b are disposed on both sides of the light guide plate 380 and the first light source assembly 390a and the second light source assembly 390b face each other, the light guide plate 380 ) Uniform light can be supplied to the whole.

In addition, the first and second light sources 382 and 384 are alternately arranged on one side (or the other side) of the light guide plate 380 to minimize interference with each other. That is, the first light source 382 may correspond to a space between adjacent second light sources 384.

Referring to FIG. 5D, in the backlight unit 392, a first light source assembly 390a including at least one first light source 382 disposed on a first light source substrate 388a on one side of the light guide plate 380 And a pair of second light source assemblies 390b including at least one second light source 384 disposed on the second light source substrate 388b.

That is, the first light source 382 is arranged along the width direction of the light guide plate 380 at one side of the light guide plate 380, and the second light source 384 is disposed at one side of the light guide plate 380. It is arranged on both sides of the first light source 382 along the width direction of the 380.

Accordingly, the number of the second light sources 384 is larger than the number of the first light sources 382.

For example, the first light source assembly 390a may be disposed between the second light source assembly 390b.

As described above, the first light source 382 may emit light of a first wavelength of about 425 to 435 nm, and the second light source 384 may emit light of a second wavelength of about 400 to 410 nm. . In addition, the first and second light source assemblies 390a and 390b are time-division driven.

At this time, since the number of the second light sources 384 is greater than the number of the first light sources 382, the efficiency of the main curing process by the second light source 384 is increased, thereby increasing the efficiency of the 3D printer.

Referring to FIG. 5E, which is a cross-sectional view for explaining the arrangement of light sources in a liquid crystal light emitting device for a 3D printer, in the backlight unit 392, at least one light source substrate 388a is disposed on one side of the light guide plate 380. A first light source assembly 390a including one light source 382 is disposed, and a pair of second light sources 384 including at least one second light source 384 disposed on the second light source substrate 388b on the other side of the light guide plate 380 2 The light source assembly 390b is disposed.

That is, the number of the second light sources 384 is larger than the number of the first light sources 382. In addition, the pair of second light source assemblies 390b are spaced apart by a thickness T of the first light source assembly 390b, and the first light source assembly 390b may correspond to a space between the second light source assemblies 390b. I can.

As described above, the first light source 382 may emit light of a first wavelength of about 425 to 435 nm, and the second light source 384 may emit light of a second wavelength of about 400 to 410 nm. . In addition, the first and second light source assemblies 390a and 390b are time-division driven.

At this time, since the number of the second light sources 384 is greater than the number of the first light sources 382, the efficiency of the main curing process by the second light source 384 is increased, thereby increasing the efficiency of the 3D printer.

In addition, since the first light source 382 and the second light source 384 do not overlap each other, interference between the first light source 382 and the second light source 384 is minimized, and the three-dimensional effect of the output is further improved.

6 is a schematic cross-sectional view of a liquid crystal light emitting device for a 3D printer according to a third embodiment of the present invention, and FIG. 7 is for explaining an arrangement of light sources in the liquid crystal light emitting device for a 3D printer according to the third embodiment of the present invention. It is a drawing.

6 and 7, a liquid crystal light emitting device (LCD) for a 3D printer according to a third embodiment of the present invention includes first and second substrates 412 bonded to each other through a liquid crystal layer (not shown). , 414, and a liquid crystal panel 410 including first and second polarizing plates 472 and 474 positioned outside each of the first and second substrates 412 and 414, and the liquid crystal panel 410 It includes a backlight unit 492 disposed below and including a light source 486 including first and second light sources 482 and 484.

In this case, the first light source 382 emits light of a first wavelength, and the second light source 482 emits light of a second wavelength shorter than the first wavelength.

Referring to FIG. 3, the liquid crystal panel 210 is interposed between the first and second substrates 312 and 314 facing each other and the first and second substrates 312 and 314, and liquid crystal molecules ( A liquid crystal layer 260 including 262, a thin film transistor Tr, a pixel electrode 240, and a common electrode 242 are included.

The thin film transistor Tr is formed on the first substrate 312 and may include a gate electrode 222, a semiconductor layer 226, a source electrode 230, and a drain electrode 232, and the pixel The electrode 240 may be connected to the drain electrode 232. In addition, the common electrode 242 may be alternately arranged with the pixel electrode 240.

Further, the first and second polarizing plates 372 and 374 positioned outside each of the first and second substrates 312 and 314 have transmission axes perpendicular to each other.

For example, the first light source 482 is arranged on the first light source substrate 488a to form a first light source assembly 490a, and the second light source 484 is arranged on the second light source substrate 488b. A second light source assembly 490b is formed, and the first and second light source assemblies 490a and 490b may be alternately arranged on the bottom frame 494. Such a backlight unit 492 may be referred to as a direct type.

Compared with the edge type backlight unit, the direct type backlight unit has the disadvantage of requiring a large number of light sources 486, but has the advantage of realizing high luminance.

As described above, each of the first and second light sources 482 and 484 may be a light emitting diode (LED), and the first wavelength of the first light source 482 may be about 425 to 435 nm, and the The second wavelength of the second light source 484 may be about 400 to 410 nm. That is, the second wavelength may be shorter than the first wavelength, and a difference between the first wavelength and the second wavelength may be 15 nm or more.

In addition, the first light source 482 and the second light source 484 are time-division driven, and the first light source 482 is driven before the second light source 484.

Meanwhile, the arrangement of the first and second light sources 482 and 484 and/or the arrangement of the first and second light source assemblies 490a and 490b may be variously changed.

For example, by arranging one first light source assembly 490a between a pair of second light source assemblies 490b to form a group and repeating the group, the number of the second light sources 490b is increased by the first light source ( It can be more than the number of 490a).

As described above, the cost and occupied space of the 3D printer using the liquid crystal light emitting device of the present invention are reduced, and power consumption is also reduced.

In addition, since the photocurable resin is cured by the time division driven first and second light sources, the three-dimensional effect of the output is improved.

Moreover, by the wavelength difference and arrangement of the first and second light sources, the three-dimensional effect of the output can be further improved without interference by light of each wavelength.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the following claims. You will understand that you can do it.

100: 3D printer LCD: liquid crystal light emitting device
210, 310, 410: liquid crystal panel 212, 312, 412: first substrate
214, 314, 414: second substrate 272, 372, 472: first polarizing plate
274, 374, 474: third polarizing plate 280, 392, 492: backlight unit
282, 380: light guide plate 284, 382, 384, 482, 494: light source
388a, 388b, 488a, 488b: light source board
390a, 390b, 490a, 490b: light source assembly

Claims (11)

A liquid crystal panel;
A backlight unit including a first light source emitting light of a first wavelength and a second light source emitting light of a second wavelength shorter than the first wavelength, and a backlight unit positioned under the liquid crystal panel,
The first light source and the second light source are time-division driven liquid crystal light emitting device for a 3D printer.
The method of claim 1,
The first wavelength is 425 ~ 435nm, the second wavelength is 400 ~ 410nm liquid crystal light emitting device for a 3D printer.
The method of claim 1,
The number of the second light source is greater than the number of the first light source 3D printer liquid crystal light emitting device.
The method of claim 1,
The backlight unit further includes a light guide plate positioned under the liquid crystal panel,
The first and second light sources are alternately arranged along the width direction of the light guide plate at one side of the light guide plate.
The method of claim 1,
The backlight unit further includes a light guide plate positioned under the liquid crystal panel,
One of the first and second light sources is arranged in a lower region of one side of the light guide plate, and the other of the first and second light sources is arranged in an upper region of one side of the light guide plate.
The method of claim 5,
The liquid crystal light emitting device for a 3D printer in which the first and second light sources are alternately arranged.
The method of claim 5,
Any one of the first and second light sources is further arranged in an upper region of the other side of the light guide plate, and the other of the first and second light sources is further arranged in a lower region of the other side of the light guide plate.
The method of claim 1,
The backlight unit further includes a light guide plate positioned under the liquid crystal panel,
The first light source is arranged at one side of the light guide plate along the width direction of the light guide plate, and the second light source is for a 3D printer arranged on both sides of the first light source along the width direction of the light guide plate at one side of the light guide plate. Liquid crystal light emitting device.
The method of claim 1,
The backlight unit further includes a light guide plate positioned under the liquid crystal panel,
The second light source is positioned at one side of the light guide plate to be spaced apart from each other in the upper area and the lower area of the light guide plate, and the first light source is a liquid crystal for a 3D printer positioned at the other side of the light guide plate to correspond to the space between the second light sources. Light-emitting device.
The method of claim 1,
A liquid crystal light emitting device for a 3D printer in which one first light source is disposed between a pair of the second light sources to form a group, and the group is repeatedly arranged under the liquid crystal panel.
A water tank containing photocurable resin;
A platform disposed above the water tank and capable of vertical movement;
The liquid crystal light emitting device for a 3D printer according to any one of claims 1 to 10 located under the water tank
3D printer comprising a.

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