KR20180024868A

KR20180024868A - Reflective Type Three Dimensional Screen And Projection System Including The Same

Info

Publication number: KR20180024868A
Application number: KR1020160111840A
Authority: KR
Inventors: 조수인; 안소형
Original assignee: 엘지디스플레이 주식회사
Priority date: 2016-08-31
Filing date: 2016-08-31
Publication date: 2018-03-08

Abstract

The present invention relates to a screen and a projection system including the same. The screen comprises: a base substrate; a first sub-pixel which is placed in an upper part of the base substrate and selectively reflects light in a right-handed circularly polarized light state; and a second sub-pixel which is placed in an upper part or a lower part of the first sub-pixel and selectively reflects light in a left-handed circularly polarized light state. In addition, the projection system comprises: a projector unit which emits a right image and a left image; a screen in which the right image and the left image are reflected and which includes a base substrate, a first sub-pixel placed in an upper part of the base substrate and selectively reflecting light in a right-handed circularly polarized light state, and a second sub-pixel placed in an upper part or a lower part of the first sub-pixel and selectively reflecting light in a left-handed circularly polarized light state; and eyeglasses which separately receive the right image and the left image. Therefore, the projection system including the same can provide improved resolution, reflectance, brightness, and light efficiency by forming a screen through accumulation of cholesteric liquid crystals with a different spiral direction from one another.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a screen and a projection system including the same,

The present invention relates to a screen, and more particularly, to a screen using a cholesteric liquid crystal and a projection system including the same.

The projection system is a device for projecting an image of a projector on a screen so that a plurality of users can simultaneously view the image. The projection system includes a rear type in which the projector is disposed on the back of the screen and a front type type).

In recent years, a projection system has been researched and developed for allowing a user to recognize an object and corresponding information at the same time by displaying information about the object on the screen while viewing an object on the back surface using a translucent screen. It can be used for augmented reality that adds virtual information to the viewing environment.

In particular, a three-dimensional screen for displaying a three-dimensional image may be used in such a projection system, which will be described with reference to the drawings.

1 is a diagram showing a projection system including a conventional three-dimensional screen.

1, a projection system 10 including a conventional three-dimensional screen includes a projector unit 20 for emitting a right-eye image and a left-eye image, a three-dimensional screen 30 for displaying a right-eye image and a left- ), A 3D glasses (40) for separately receiving a right eye image and a left eye image.

The projector unit 20 is disposed on the back surface of the three-dimensional screen 30 and emits the right-eye image and the left-eye image constituting the stereoscopic type three-dimensional image using the binocular parallax to the three- do.

The three-dimensional screen 30 converts the right-eye image and the left-eye image transmitted from the projector unit 20 into the right-handed circularly polarized light and left-handed circularly polarized light, respectively,

To this end, the three-dimensional screen 30 includes a first subpixel 32 for selectively passing the first light L1 in the right-eye polarized state among the right eye images, a second subpixel 32 for passing the second light L2 in the left- And a second sub-pixel 34 for selectively passing the sub-pixel SP.

For example, the first and second sub-pixels 32 and 34 may include a polarizing layer.

The three-dimensional glasses 40 are worn by a user located on the front face of the three-dimensional screen 30 and include a first lens 42 selectively passing only the first light L1 in a right circularly polarized state, And a second lens 44 selectively passing only the second light L2.

In the projection system 10 including the conventional three-dimensional screen, the right-eye image and the left-eye image emitted by the projector unit 20 pass through the three-dimensional screen 30, And the three-dimensional glasses 40, the user recognizes the three-dimensional image by synthesizing the right-eye image and the left-eye image using the parallax information.

However, in the projection system 10 including such a conventional three-dimensional screen, when the projector unit 20 is disposed on the back of the three-dimensional screen 30 and a user wearing the three- ) Is used, there is a problem that an excessively large space is required.

Since the first and second subpixels 32 and 34, which convert the right-eye image and the left-eye image into the right-handed circularly polarized state and the left-handed circularly polarized state, respectively, There is a problem that the resolution of the three-dimensional screen 30 in the case of displaying is reduced to half as compared with the case of displaying the two-dimensional image.

In addition, since the first and second sub-pixels 32 and 34 of the three-dimensional screen 30 pass only one of right-handed circularly polarized light or left-circularly polarized light, the remaining one is blocked.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and provides a screen and a projection system including the same, wherein space utilization is minimized and resolution is improved by stacking cholesteric liquid crystals to form first and second sub- .

The present invention also provides a screen and a projection system including the same, wherein the space utilization is minimized, the brightness of the image is improved, and the light efficiency is improved by laminating the cholesteric liquid crystal to form the first and second sub-pixels For other purposes.

According to an aspect of the present invention, there is provided a liquid crystal display device including a base substrate, a first sub-pixel disposed on the base substrate and selectively reflecting light in a right-handed circularly polarized state, And a second sub-pixel for selectively reflecting light in a left-handed circular polarization state.

The first and second sub-pixels may have a convex lens shape in which the thickness of the central portion is larger than the thickness of the edge portion, or a plate shape in which the thickness of the center portion is equal to the thickness of the edge portion.

The first sub-pixel includes red, green, and blue first sub-pixels disposed on the base substrate. The second sub-pixel includes red, green, and blue sub-pixels, Wherein the first sub-pixel includes a cholesteric liquid crystal in which a spiral direction and a repetitive pitch are determined so as to reflect light having the right-handed polarization state and the red wavelength band, Pixel, the second sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetitive pitch are determined so as to reflect light having the left-handed circular polarization state and the red wavelength band, and the rust- And a cholesteric liquid crystal in which the helical direction and the repetitive pitch are determined so as to reflect light having a green wavelength band and the green second subpixel has a phase to reflect light having the left circular polarization state and the green wavelength band, Wherein the blue first sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the right-handed circular polarization state and the blue wavelength band, And the blue second sub-pixel may include a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the left-handed circular polarization state and the blue wavelength band.

The base substrate may be transparent, and the screen may further include a transmissive portion disposed around the red, green and blue first sub-pixels and the red, green and blue sub-pixels.

The first sub-pixel includes red, green, and blue first sub-pixels disposed on the entire upper surface of the base substrate. The second sub-pixel includes red, green, and blue sub- Pixel includes a cholesteric liquid crystal in which a spiral direction and a repetitive pitch are determined so as to reflect light having the right-handed polarization state and the red wavelength band, and the red second sub- And a cholesteric liquid crystal in which the helical direction and the repetitive pitch are determined so as to reflect light having a polarization state and a red wavelength band, And the cholesteric liquid crystal in which the helix direction and the repetition pitch are determined, and the rust-second sub-pixel includes the helix direction and the helix direction so as to reflect the light having the left- Wherein the blue first sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the right-handed circular polarization state and the blue wavelength band, And the blue second sub-pixel may include a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the left-handed circular polarization state and the blue wavelength band.

According to another aspect of the present invention, there is provided a projection display apparatus including a projector unit that emits a right-eye image and a left-eye image, a base unit that reflects the right-eye image and the left-eye image, A screen including a first sub-pixel and a second sub-pixel disposed on the upper or lower portion of the first sub-pixel and selectively reflecting light in a left-handed circular polarization state; and a spectacle lens for separating and receiving the right- and left- And a projection system.

The first sub-pixel includes red, green, and blue first sub-pixels disposed on the base substrate, and the second sub-pixel includes red, green, and blue sub-pixels, Wherein the first sub-pixel includes a cholesteric liquid crystal in which a spiral direction and a repetitive pitch are determined so as to reflect light having the right-handed polarization state and the red wavelength band, Pixel, the second sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetitive pitch are determined so as to reflect light having the left-handed circular polarization state and the red wavelength band, and the rust- And a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having a green wavelength band, and the green second subpixel reflects light having the left-handed circular polarization state and the green wavelength band Wherein the blue first sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined, and the blue first sub-pixel includes a cholesteric liquid crystal having the helical direction and the repetition pitch determined to reflect the light having the right- And the blue second sub-pixel may include a cholesteric liquid crystal in which the helical direction and the repetitive pitch are determined so as to reflect light having the left-handed circular polarization state and the blue wavelength band.

The projector unit may include first and second projectors that simultaneously emit the right-eye image and the left-eye image, respectively.

The projector unit may further include a projector that sequentially emits the right-eye image and the left-eye image, and a controller that is disposed in front of the projector and modulates the right-eye image and the left-eye image to have the right- And may include a polarization modulator.

The present invention has the effect of minimizing the space usage and improving the resolution by forming the first and second sub-pixels by stacking the cholesteric liquid crystal.

The present invention has the effect of minimizing the space use, improving the brightness of the image, and improving the light efficiency by stacking the cholesteric liquid crystals to form the first and second sub-pixels.

1 shows a projection system comprising a conventional three-dimensional screen;
Figure 2 illustrates a projection system including a screen according to a first embodiment of the present invention.
Fig. 3 is an enlarged plan view of the screen of Fig. 2; Fig.
4 is a cross-sectional view taken along the line IV-IV in Fig. 3;
5 illustrates a projection system including a screen according to a second embodiment of the present invention.
6 is a sectional view showing a screen of a projection system according to a third embodiment of the present invention;

Hereinafter, a screen and a projection system including the screen according to the present invention will be described with reference to the accompanying drawings.

2 is a diagram illustrating a projection system including a screen according to a first embodiment of the present invention.

2, the projection system 110 including the screen according to the first embodiment of the present invention includes a projector 130 for emitting a right eye image and a left eye image, a screen 130 for reflecting a right eye image and a left eye image, ), A glasses 140 for separately receiving a right eye image and a left eye image.

The projector unit includes first and second projectors 120 and 122 that simultaneously emit a right eye image and a left eye image respectively and the first and second projectors 120 and 122 are disposed on the front surface of the screen 130 The right eye image and the left eye image constituting a stereoscopic type three-dimensional image using binocular parallax are simultaneously emitted to the screen 130.

For example, the first projector 120 emits the right-handed circularly polarized light ray L0 constituting the right-eye image, and the second projector 122 emits the left-handed circularly polarized light ray constituting the left- L0).

The screen 130 reflects the left and right eye images transmitted from the first and second projectors 120 and 122 of the projector unit and transmits the reflected light to the user. And the opposite side, the projector unit and the user are disposed in front of the front surface of the screen 130.

To this end, the screen 130 includes a first sub-pixel 132 that reflects the zero-order light L0 in the right-handed circular polarization state of the right-eye image and emits the first light L1 as a right- And a second sub-pixel 134 which reflects the zero-order light L0 in a polarized state and emits the second light L2 as a left-circularly polarized light.

The first and second sub-pixels 132 and 134 are formed of cholesteric liquid crystal (CLC) and can be stacked at the same position in a plan view. 3 and Fig.

The eyeglasses 140 are worn by a user positioned on the front surface of the screen 130 and include a first lens 142 selectively passing only the first light L1 in a right circularly polarized state, L2 through the second lens 144 to selectively pass therethrough.

In the projection system 110 including the screen according to the first embodiment of the present invention, the right eye image in the right-handed circularly polarized state and the right-eye image in the left-handed circularly polarized state simultaneously emitted by the first and second projectors 120, When the left eye image is reflected on the screen 130 and the glasses 140 are incident on the right eye and left eye of the user respectively, the user recognizes the three-dimensional image by synthesizing the right eye image and the left eye image using the parallax information .

At this time, since the first and second sub-pixels 132 and 134 that reflect the right-eye image and the left-eye image are stacked on the same plane in the screen 130, the first and second projectors 120 and 122 The resolution of the three-dimensional image recognized by the combination of the right-eye image and the left-eye image simultaneously emitting is the same as the resolution of the two-dimensional image in the case where the first and second projectors 120 and 122 of the projector display the same image, As a result, resolution degradation of the three-dimensional image is prevented.

Since the first and second sub-pixels 132 and 134 of the screen 130 reflect the left-eye image in the left-handed polarization state and the left-eye image in the right-handed circular polarization state, the reflectivity is not lowered and the brightness of the image is prevented from being lowered .

Fig. 3 is an enlarged plan view of the screen of Fig. 2, and Fig. 4 is a cross-sectional view taken along the line IV-IV of Fig.

3 and 4, the screen 130 of the projection system 110 according to the first embodiment of the present invention includes red, green, and blue pixels (red, green, and blue) constituting one sub- SPr, SPg and SPb and a transmissive portion TA surrounding red, green and blue subpixels SPr, SPg and SPb.

In the first embodiment, the red, green, and blue subpixels SPr, SPg, and SPb have circular shapes and are arranged close to each other. However, SPb may have a polygonal shape such as a quadrangular shape or a hexagonal shape or may be spaced apart from each other and the area ratio of the transmissive portion TA may be determined to various values in consideration of transparency of the screen 130. [

The red, green, and blue subpixels SPr, SPg, and SPb include first and second subpixels 132 and 134, respectively.

Specifically, red, green and blue first sub-pixels 132 (r) and 132 (g) and 132 (b) are formed on a transparent base substrate 136, Green, and blue sub-pixels 134 (r), 134 (g), and 134 (b) are formed on the red (R) And the second subpixels 132 (r) and 134 (r) form the red subpixel SPr and the green first and second subpixels 132 (g) and 134 (g) And the blue first and second sub-pixels 132 (b) and 134 (b) form a blue sub-pixel SPb.

The base substrate 136 may be made of various materials such as glass or plastic.

Green, and blue sub-pixels 132 (r), 132 (g), and 132 (b) of red, green, and blue subpixels SPr, SPg, SPb, (134 (r), 134 (g), and 134 (b) may be made of a cholesteric liquid crystal.

The cholesteric liquid crystal has a spiral structure, which reflects only the component of the polarization state and the wavelength corresponding to the helical direction and the repetitive pitch of the helical structure among the incident light, and transmits the remaining components.

Specifically, the cholesteric liquid crystal has circularly polarized light in the same direction as the spiral direction, and reflects light having a wavelength equal to the product of the average refractive index and the repetition pitch, and transmits the remaining light.

Accordingly, the first sub-pixel 132 (r) is a cholesteric lens having a helical polarization state and a red wavelength band corresponding to about 620 nm to about 780 nm, and transmits the remaining light, And the red second subpixel 134 (r) may be formed in a helix direction and a helix direction so as to reflect light having a red wavelength band corresponding to a left circularly polarized state and a wavelength of about 620 nm to about 780 nm, And a cholesteric liquid crystal having a pitch determined.

Likewise, the green first sub-pixel 132 (g) has a helix polarization state and a cholesteric (e. G., Green) wavelength band having a helix polarization and a repetitive pitch determined to reflect light having a green wavelength band corresponding to about 490 nm to about 570 nm, And the green second subpixel 134 (g) may be formed of a liquid crystal and the second green subpixel 134 (g) may be formed of a material that reflects light having a green wavelength band corresponding to a left circular polarization state and about 490 nm to about 570 nm, And the blue first sub-pixel 132 (b) may be formed of a cholesteric liquid crystal that reflects light having a right circular polarization state and a blue wavelength band corresponding to about 440 nm to about 490 nm, and transmits the remaining light The blue second sub-pixel 134 (b) may be formed of a cholesteric liquid crystal in which the helical direction and the repetitive pitch are determined, and the blue second sub-pixel 134 (b) reflects light having a left circular polarization state and a blue wavelength band corresponding to about 440 nm to about 490 nm Light is transmitted And a cholesteric liquid crystal in which the helical direction and the repetitive pitch are determined.

The red, green, and blue sub-pixels 134 (r), 134 (g), and 134 (b) b) have a convex lens shape in which the thickness of the central portion is larger than the thickness of the edge portion in each cross-sectional area. In this case, the light transmitted from the projector portion may be diffused to improve the uniformity of the image.

(R), 132 (g), and 132 (b) and red, green, and blue sub-pixels 134 (r) 134 (b) may have a plate shape in which the thickness of the central portion is equal to the thickness of the edge portion in cross section.

The red, green, and blue sub-pixels 134 (r), 134 (g), and 134 (b) of the red, green, and blue primary pixels 132 (r) ) Can be formed using a soluble process such as inkjet.

In the first embodiment, the red, green and blue first sub-pixels 132 (r) and 132 (g) are formed on the base substrate 136 in order to reflect only the light of a specific circularly polarized light and the specific wavelength, (B)) and 132 (b) and red, green, and blue sub-pixels 134 (r), 134 (g), and 134 (b) are sequentially stacked on the base substrate 136 (R), 132 (g), 132 (g) and 134 (b) on the red, green and blue sub-pixels 132 (b) may be sequentially stacked.

In this screen 130, the red, green, and blue zero lights L0 (rgb) of the right-handed circular polarization of the right eye image of the first projector 120 of the projector unit and the left When the red, green, and blue 0 light (L0 (rgb)) in the polarized state is incident, the red, green, and blue 0 light (L0 (R), 132 (g), and 132 (b) after passing through the sub-pixels 134 (r) Green and blue first lights L1 (r), L1 (g) and 134 (b) of the right circularly polarized light are transmitted through the red, green, and blue sub-pixels 134 Green, and blue sub-pixels 134 (r) and 134 (r) are emitted from the red, green, and blue subpixels 134 (r) and 134 green and blue second lights L2 (r), L2 (g), and L2 (b) in the left circularly polarized state.

The red, green and blue first sub-pixels 132 (r) and 132 (g) and 132 (b) 134 (b) and 134 (b) reflect the left and right eye images of the first and second projectors 120 and 122 of the projector unit, respectively.

As described above, in the projection system 110 including the screen according to the first embodiment of the present invention, the red, green and blue first sub-pixels 132 (r) and 132 (r) of the screen 130 are formed using the cholesteric liquid crystal, Green and blue second sub-pixels 134 (r), 134 (g) and 134 (b) are formed at the same positions in the plan view by stacking the first and second sub- The resolution of the three-dimensional image recognized by the combination of the right-eye image and the left-eye image of the second projectors 120 and 122 is the same as that of the two-dimensional image, which is the case where the first and second projectors 120 and 122 of the projector display the same image Resolution, and as a result, resolution degradation of the three-dimensional image is prevented.

The red, green and blue first sub-pixels 132 (r) and 132 (g) and 132 (b) of the screen 130 and the red, g), and 134 (b) reflect the left-eye image of the right-handed circular polarization state and the left-eye image of the left-hand circularly polarized state, so that the light loss through the back surface of the screen 130 is minimized, Deterioration is prevented.

In addition, since the projector is disposed on the front surface of the screen 130, space usage is minimized and the screen 130 can be configured as a translucent screen including the transmissive portion TA, so that it can be easily applied to an augmented reality. In this case, the screen 130 may be operated as a transmissive screen for the background image and as a reflective screen for the three-dimensional image of the projector unit. So that a combined image of the background image and the three-dimensional image can be provided to the user.

When the projector unit supplies the right-eye image and the left-eye image in the same two-dimensional image, the projection system 110 can display a two-dimensional image. In this case, Green, and blue sub-pixels 134 (r), 134 (g), and 134 (b) of the right- Since the image and the two-dimensional image of the left-handed circularly polarized state are reflected, the light loss through the back surface of the screen 130 is prevented and the brightness of the two-dimensional image is improved.

In another embodiment, the projector unit may be composed of a single projector and a polarization modulator, which will be described with reference to the drawings.

5 is a view showing a projection system including a screen according to a second embodiment of the present invention, and a description of the same parts as those of the first embodiment will be omitted.

5, a projection system 210 including a screen according to a second embodiment of the present invention includes a projector unit 210, a projector unit 210, a right-eye image 210, and a left- A screen 230, glasses 240 for separately receiving a right eye image and a left eye image.

The projector unit includes a projector 220 that sequentially emits a right-eye image and a left-eye image according to a time-division method, and a projector 220 that is disposed in front of the projector 220 and that uses right- and left- The projector 220 and the polarization modulator 224 are disposed on the front surface of the screen 230 and are each provided with a stereoscopic type using a binocular parallax according to a time division method, The right eye image and the left eye image constituting the three-dimensional image of the left eye image are successively emitted to the screen 230.

For example, during the first half of a frame, the projector 220 may emit the zeroth light L0 constituting the right eye image and the polarization modulator 224 may cause the zeroth light L0 to have a right circular polarization state .

During the second half of the frame, the projector 220 emits the zero-th light L0 constituting the left eye image, and the polarization modulator 224 may cause the zero-th light L0 to have the left-handed circular polarization state.

The screen 230 reflects the left and right eye images transmitted from the projector 220 and the polarization modulator 224 of the projector unit, respectively, and transmits the reflected light to the user.

To this end, the screen 230 includes a first sub-pixel 232 for reflecting the zero-order light L0 in the right-handed circular polarization state of the right-eye image and emitting the first light L1 in a right-handed circular polarization state, And a second sub-pixel 234 which reflects the zeroth-order light L0 in a polarized state and emits the second light L2 as a left-circularly polarized light.

The first and second subpixels 232 and 234 are made of cholesteric liquid crystal (CLC) and can be stacked at the same position in plan view. 1, and thus a description thereof will be omitted.

The glasses 240 are worn by a user located on the front surface of the screen 230 and include a first lens 242 selectively passing only the first light L1 in a right circularly polarized state, L2. &Lt; / RTI >

As described above, in the projection system 210 including the screen according to the second embodiment of the present invention, the right eye image and the left-handed circularly polarized light state in the right-handed circular polarization state, in which the projector 220 and the polarization modulator 224 of the projector unit sequentially emit, The left eye image of the user is reflected on the screen 230 and is input to the right eye and the left eye of the user respectively by the glasses 240. The user combines the right eye image and the left eye image using the time difference information, do.

In this case, since the first and second sub-pixels 232 and 234 that reflect the right and left eye images are stacked on the same plane in the screen 230, the projector 220 and the polarization modulator 224 of the projector unit are sequentially Dimensional image, which is a case where the projector 220 and the polarization modulator 224 of the projector unit display the same image, the resolution of the three-dimensional image recognized by the combination of the right-eye image and the left- Resolution degradation of the three-dimensional image is prevented.

Since the first and second subpixels 232 and 234 of the screen 230 reflect the left-eye image in the right-handed polarization state and the left-eye image in the left-handed circular polarization state, light loss through the back surface of the screen 230 is minimized As a result, a decrease in reflectance and a decrease in luminance of the three-dimensional image are prevented.

In addition, since the projector unit is disposed on the front surface of the screen 230, space usage is minimized and the screen 230 is configured as a semi-transparent screen including the transmission unit TA, so that it can be easily applied to an augmented reality. In this case, the screen 230 may be operated as a transmissive screen for the background image and as a reflective screen for the three-dimensional image of the projector unit. So that a combined image of the background image and the three-dimensional image can be provided to the user.

When the projector unit supplies the right eye image and the left eye image as the same two-dimensional image, the projection system 210 can display the two-dimensional image. In this case, the first sub- The two sub-pixels 234 reflect the two-dimensional image of the right-handed circularly polarized state and the two-dimensional image of the left-handed circularly polarized state, thereby preventing light loss through the back surface of the screen 230 and improving the brightness of the two-

On the other hand, in another embodiment, the screen may be composed of an opaque screen, which will be described with reference to the drawings.

FIG. 6 is a cross-sectional view of a screen of a projection system according to a third embodiment of the present invention, and a description of the same projector unit and glasses as those of the first and second embodiments will be omitted.

6, the screen 330 of the projection system according to the third embodiment of the present invention includes red, green, and blue subpixels (SPr, SPg, SPb) Green and blue subpixels SPr, SPg and SPb are formed of first and second subpixels 132 and 134, respectively.

More specifically, the first sub-pixel 332 (r), the second sub-pixel 334 (r), the first green sub-pixel 332 (g) The blue sub-pixel 332 (b), and the blue sub-pixel 334 (b) are sequentially formed, and the first and second sub-pixels 332 (b) (r) and 334 (r) constitute a red subpixel SPr, green first and second subpixels 332 (g) and 334 (g) form a green subpixel SPg, And the second sub-pixels 332 (b) and 334 (b) form a blue sub-pixel SPb.

The base substrate 336 may be made of various materials such as glass or plastic.

Green, and blue sub-pixels 332 (r), 332 (g), and 132 (b) of red, green, and blue subpixels SPr, SPg, SPb, (334 (r), 334 (g), and 334 (b) may be made of a cholesteric liquid crystal.

The red, green and blue first sub-pixels 332 (r), 332 (g) and 332 (b) b) may be formed on the entire surface of the base substrate 336 using a soluble process such as nozzle coating.

In the third embodiment, the first sub-pixel 332 (r) and the second sub-pixel 332 (r) are formed on the base substrate 336, since the cholesteric liquid crystal only reflects light of specific circular polarization and specific wavelength, 334 (r), green first sub-pixel 332 (g), green second sub-pixel 334 (g), blue first sub-pixel 332 (r), the red second sub-pixel 334 (r), the green sub-pixel 332 (r), and the green sub-pixel 332 The order of the first subpixel 332 (g), the second subpixel 334 (g), the blue first subpixel 332 (b), and the blue second subpixel 334 (b) .

The red, green, blue zero light L0 (rgb) of the right circularly polarized state of the right eye image of the projector unit and red, green, and blue zero rays L0 (rgb) of the left- The blue zero subpixel 334 (b), the blue subpixel 332 (b), the green subpixel 332 (b), and the green subpixel 332 After passing through the sub-pixel 334 (g), the green first sub-pixel 332 (g) and the red second sub-pixel 334 (r) (R), the green first sub-pixel 332 (g), the green second sub-pixel 334 (g), the blue first sub-pixel 332 (b) (R (r)) in the left-eye polarized state of the left eye image is transmitted through the second sub-pixel 334 (b) (Green sub-pixel 332 (b)), the green sub-pixel 334 (g), and the green sub-pixel 332 (g) (R), green second sub-pixel 334 (g), blue first sub-pixel 332 (g), and blue first sub-pixel 332 b) and the blue second sub-pixel 334 (b) and is emitted as the red light Ll (r) in the left circularly polarized state.

Likewise, the right-handed circularly polarized light state of the right-eye image and the green and blue zero-light L0 (gb) of the left-handed circularly polarized state are respectively the first green subpixel 332 (g), the second green subpixel 334 L1 (g), L1 (g)), the blue first sub-pixel 332 (b) and the blue sub-pixel 334 (b) And the green, blue second light L2 (g) and L2 (b) in a left circularly polarized state.

At this time, the first sub-pixel 332 (r), the second sub-pixel 334 (r), the first green sub-pixel 332 (g) Since the sub-pixel 334 (g), the blue sub-pixel 332 (b), and the blue sub-pixel 334 (b) reflect the right- and left-eye images of the projector unit, Thereby minimizing the loss of light.

As described above, in the projection system including the screen according to the third embodiment of the present invention, a cholesteric liquid crystal is used to form the red (R) sub-pixel 332 (r) 334 (r), green first sub-pixel 332 (g), green second sub-pixel 334 (g), blue first sub-pixel 332 the resolution of the three-dimensional image recognized by the combination of the right-eye image and the left-eye image of the projector unit is the same as the resolution of the two-dimensional image in the case where the projector unit displays the same image, As a result, resolution degradation of the three-dimensional image is prevented.

The first subpixel 332 (r) of the screen 330, the second subpixel 334 (r), the first green subpixel 332 (g), the second green subpixel 334 (b) and the blue second sub-pixel 334 (b) reflect the right-eye image of the right-handed circularly polarized state and the left-eye image of the left-handed circularly polarized state, ) Light loss through the back surface is minimized, and as a result, a reduction in reflectance and a decrease in luminance of the three-dimensional image are prevented.

When the projector unit supplies the right eye image and the left eye image as the same two-dimensional image, the projection system can display the two-dimensional image. In this case, the red, green, and blue first sub-pixels 332 green and blue second sub-pixels 334 (r), 334 (g), and 334 (b) Since the two-dimensional image in the polarized state is reflected, the light loss through the back surface of the screen 330 is prevented and the brightness of the two-dimensional image is improved.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that

110: projection system 120: first projector
122: second projector 130: screen
132: first sub-pixel 134: second sub-pixel
140: glasses

Claims

A base substrate;
A first sub-pixel disposed on the base substrate and selectively reflecting light in a right circularly polarized state;
And a second sub-pixel disposed on or below the first sub-pixel and selectively reflecting light in a left-
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The method according to claim 1,
Wherein each of the first and second sub-pixels has a convex lens shape in which the thickness of the central portion is larger than the thickness of the edge portion, or the thickness of the central portion is equal to the thickness of the edge portion.

The method according to claim 1,
The first sub-pixel includes red, green and blue first sub-pixels arranged on the base substrate,
Green, and blue sub-pixels, wherein the second sub-pixels include red, green, and blue sub-pixels each disposed at an upper portion or a lower portion of the red, green,
Wherein the first sub-pixel includes a cholesteric liquid crystal in which a spiral direction and a repetitive pitch are determined so as to reflect light having the right-handed circular polarization state and the red wavelength band,
The second sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetitive pitch are determined so as to reflect light having the left-handed circular polarization state and the red wavelength band,
Wherein the green first sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the right-handed circular polarization state and the green wavelength band,
Wherein the green second sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the left-handed circular polarization state and the green wavelength band,
Wherein the blue first sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the right-handed polarization state and the blue wavelength band,
And the blue second sub-pixel comprises a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the left-handed circular polarization state and the blue wavelength band.

The method of claim 3,
The base substrate is transparent,
Further comprising a transmissive portion disposed around the red, green and blue first sub-pixels and the red, green and blue sub-pixels.

The method according to claim 1,
The first sub-pixel includes red, green and blue first sub-pixels arranged on the upper surface of the base substrate,
The second sub-pixel includes red, green, and blue sub-pixels arranged on the upper surface of the base substrate,
Wherein the first sub-pixel includes a cholesteric liquid crystal in which a spiral direction and a repetitive pitch are determined so as to reflect light having the right-handed circular polarization state and the red wavelength band,
The second sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetitive pitch are determined so as to reflect light having the left-handed circular polarization state and the red wavelength band,
Wherein the green first sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the right-handed circular polarization state and the green wavelength band,
Wherein the green second sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the left-handed circular polarization state and the green wavelength band,
Wherein the blue first sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the right-handed polarization state and the blue wavelength band,
And the blue second sub-pixel comprises a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the left-handed circular polarization state and the blue wavelength band.

A projector unit for emitting a right eye image and a left eye image;
A first sub-pixel disposed on an upper portion or a lower portion of the first sub-pixel to reflect the right-eye image and the left-eye image, a base substrate, A screen including a second sub-pixel for selectively reflecting light in a polarization state;
Eyeglasses separating and receiving the right-eye image and the left-
.

The method according to claim 6,
The first sub-pixel includes red, green and blue first sub-pixels arranged on the base substrate,
Green, and blue sub-pixels, wherein the second sub-pixels include red, green, and blue sub-pixels each disposed at an upper portion or a lower portion of the red, green,
Wherein the first sub-pixel includes a cholesteric liquid crystal in which a spiral direction and a repetitive pitch are determined so as to reflect light having the right-handed circular polarization state and the red wavelength band,
The second sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetitive pitch are determined so as to reflect light having the left-handed circular polarization state and the red wavelength band,
Wherein the green first sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the right-handed circular polarization state and the green wavelength band,
Wherein the green second sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the left-handed circular polarization state and the green wavelength band,
Wherein the blue first sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the right-handed polarization state and the blue wavelength band,
Wherein the blue second sub-pixel comprises a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the left-handed circular polarization state and the blue wavelength band.

The method according to claim 6,
The first sub-pixel includes red, green and blue first sub-pixels arranged on the upper surface of the base substrate,
The second sub-pixel includes red, green, and blue sub-pixels arranged on the upper surface of the base substrate,
Wherein the first sub-pixel includes a cholesteric liquid crystal in which a spiral direction and a repetitive pitch are determined so as to reflect light having the right-handed circular polarization state and the red wavelength band,
The second sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetitive pitch are determined so as to reflect light having the left-handed circular polarization state and the red wavelength band,
Wherein the green first sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the right-handed circular polarization state and the green wavelength band,
Wherein the green second sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the left-handed circular polarization state and the green wavelength band,
Wherein the blue first sub-pixel includes a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the right-handed polarization state and the blue wavelength band,
Wherein the blue second sub-pixel comprises a cholesteric liquid crystal in which the helical direction and the repetition pitch are determined so as to reflect light having the left-handed circular polarization state and the blue wavelength band.

The method according to claim 6,
Wherein the projector unit includes first and second projectors that simultaneously emit the right-eye image and the left-eye image, respectively.

The method according to claim 6,
In the projector unit,
A projector for sequentially emitting the right-eye image and the left-eye image;
A polarization modulator disposed in front of the projector and modulating the right-eye image and the left-eye image to have the right-handed circular polarization state and the left-
.