KR20130115005A - Projection screen and projection system having the same - Google Patents

Projection screen and projection system having the same Download PDF

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Publication number
KR20130115005A
KR20130115005A KR1020120037524A KR20120037524A KR20130115005A KR 20130115005 A KR20130115005 A KR 20130115005A KR 1020120037524 A KR1020120037524 A KR 1020120037524A KR 20120037524 A KR20120037524 A KR 20120037524A KR 20130115005 A KR20130115005 A KR 20130115005A
Authority
KR
South Korea
Prior art keywords
layer
projector
projection screen
lens layer
light
Prior art date
Application number
KR1020120037524A
Other languages
Korean (ko)
Inventor
오상근
김성태
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020120037524A priority Critical patent/KR20130115005A/en
Publication of KR20130115005A publication Critical patent/KR20130115005A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

PURPOSE: A projection screen and a projection system having the same are provided to obtain a wide viewing angle and an even spreading effect. CONSTITUTION: A projection screen (100) displaying images projected by a projector (200) includes a lens layer and a reflection layer. The lens layer is formed of a synthetic resin. The reflection layer is formed on the rear surface of the lens layer and reflects light projected by the projector. The rear surface of the lens layer is formed into a curved surface to make the light reflected by the reflection layer spread. [Reference numerals] (AA) Front; (BB) Wall; (CC) Side

Description

PROJECTION SCREEN AND PROJECTION SYSTEM HAVING THE SAME}

The present invention relates to a projection screen configured to display an image projected from a projector and a projection system having the same.

As the information age evolves rapidly, the importance of a display system that implements a large screen is being emphasized. An example of such a display system is a projection system including a projector for enlarging and projecting an image and a projection screen for displaying an image projected from the projector on a large screen having a predetermined size.

Recently, as display performance becomes more important, various structural improvements to the projection screen have been tried and applied.

For example, conventional projector screens have a problem in that contrast is reduced in a bright room, and thus there is a commercial limitation. Projectors for short throw projector screens that have improved the above limitations have limitations of non-uniformity of front brightness distribution and consequent viewing angle.

In other words, the projection screen for near projection has a narrow viewing angle because of the lens layer designed for condensing, and to compensate for this, an independent layer, a diffusion layer, is required.

The present invention can secure a wide viewing angle, and to provide a projection screen having a simpler structure and a projection system having the same.

In order to achieve the above object of the present invention, the projection screen according to an embodiment of the present invention is a lens layer formed of a synthetic resin, and a reflective layer formed on the back of the lens layer to reflect the light projected from the projector It includes, the back of the lens layer is formed in a curved surface so that the light reflected by the reflective layer can be diffused.

According to an embodiment related to the present invention, the lens layer includes a base portion having a predetermined thickness and a convex portion protrudingly protruding from the base portion to form a rear surface, and the reflective layer covers the convex portion to form a concave reflective surface. do.

The base portion may be gradually formed thicker toward the bottom so that the convex portion has a shape protruding gradually toward the bottom.

In addition, the projection screen may further include a light absorbing layer disposed to cover the upper and lower surfaces of the base portion and to absorb light incident from the outside.

The base portion and the convex portion may form one cell, and the cells may be arranged to form a column and a row to form the lens layer. In this case, cells forming the same row among the cells may be formed in the same size. In addition, the inclination angle between the reflective surface and the front surface of the base portion may be formed to gradually increase toward the above row.

According to another example related to the present invention, the lens layer includes Fresnel lenses of a linear type or a circular type.

According to another example related to the present invention, the projection screen further includes a base layer formed on the front surface of the lens layer, and a cover layer disposed to cover the base layer and configured to reduce surface reflection.

In addition, in order to realize the above object, the present invention includes a lens layer formed of a synthetic resin having a convex portion protruding from the back, and formed on the back of the lens layer to reflect light projected from the projector. And a reflective layer, wherein the reflective layer covers the convex portion to form a concave reflective surface to propose a projection screen configured to diffuse the reflected light.

The present invention also discloses a projection system comprising a projector configured to enlarge and project an image, and the projection screen configured to display the image projected from the projector.

According to an example related to the present invention, the reflective layer is disposed to be inclined so that the reflective surface faces the projector.

According to the present invention having the above-described configuration, the lens layer has a convex portion forming a rear surface, the reflective layer is formed to cover the convex portion to form a concave reflective surface to diffuse the reflected light, ensuring a wider viewing angle Can be.

In addition, according to the above structure, since a separate layer, that is, a diffusion layer, which is necessary to compensate for a narrow viewing angle is unnecessary, there is an advantage in terms of manufacturing process reduction and cost reduction. In addition, the present invention can obtain a uniform diffusion effect as compared to the structure having a roughened diffusion layer.

1 is a conceptual diagram showing an example of a projection system related to the present invention.
FIG. 2 is a conceptual view showing that an image projected from the projector shown in FIG. 1 is displayed on a projection screen. FIG.
3 is a configuration diagram schematically showing the projector of FIG.
4 and 5 are a perspective view and a cross-sectional view showing a micro area of the projection screen shown in FIG. 1, respectively.
FIG. 6 is a conceptual view of the lens layer of FIG. 4 as viewed from the portion A; FIG.

Hereinafter, a projection screen and a projection system having the same according to the present invention will be described in detail with reference to the drawings.

As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. In addition, the suffixes "units" and "units" for the components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other.

1 is a conceptual diagram illustrating an example of a projection system 10 related to the present invention.

Referring to FIG. 1, the projection system 10 includes a projector 200 and a projection screen 100. The projector 200 is formed to enlarge and project an image on the projection screen 100, and the projection screen 100 is configured to display the image.

The projector 200 and the projection screen 100 may be arranged to satisfy positional conditions (distance, angle, etc.) with respect to each other in order to match a focal length, a screen size, and the like of the displayed image. In order to maintain the above position conditions, the support unit 300 may be further provided and coupled to the projector 200 and the projection screen 100, respectively, to integrate them.

2 is a conceptual diagram illustrating that an image projected from the projector 200 illustrated in FIG. 1 is displayed on the projection screen 100.

Referring to FIG. 2, the projector 200 includes an optical system to enlarge and project an image using reflection or refraction of light. The projector 200 may include a broadcast receiver for receiving broadcast signals from a server through a wired and / or wireless communication network, an interface unit serving as a path to an external device, a sound output unit, and a user input unit to perform various functions. For example, a keyboard, a remote controller, and the like) may be included.

The projector 200 may be configured to directly project an image projected through the projection lens 280, or may be configured to reflect and enlarge an image on the screen by the reflector 202 as shown. The reflector 202 may be configured to be rotatable with respect to the body 201 to protrude to the outside when the projector 200 is operated to reflect the image.

The projection screen 100 is configured to display an image projected from the projector 200, and includes a plurality of layers (see FIG. 4 (110, 120, 130, 140, 150)) and a frame accommodating the plurality of layers ( 101, which may be referred to as a housing, cover, etc.). The window 102 may be disposed on the front surface of the frame 101 to cover the front surface of the projection screen 100. The window 102 may be made of a light transmissive synthetic resin, tempered glass, and the like.

The illustrated projection system 10 is a front projection type projection system 10 in which an image is projected obliquely at the front lower end of the projection screen 100 and displayed on the front surface.

3 is a configuration diagram schematically illustrating the projector 200 of FIG. 1.

Referring to FIG. 3, the projector 200 may include a light source array 210 including a plurality of light sources, an optical system (eg, focusing optics 220), and a wavelength converting material (eg, a light source array 210). Color wheel 230 with phosphor material, light integrator 240, delay optics or collecting optics 250, prism 260, microdisplay imager 270 ) And projection lens 280.

Since the description of the configuration is also disclosed in Korea Patent Publication No. 10-2010-0037646, detailed description thereof will be omitted.

The projector 200 may further include a dichroic filter 290 installed between the light source array 210 and the imaging optical system 220. The dichroic filter 290 is a material that transmits or reflects a part of the excitation light of the light source array 210 according to the wavelength. The dichroic filter 290 transmits light of a short wavelength and reflects light of a long wavelength, or reflects light of a short wavelength. And transmit light of long wavelengths. The dichroic filter 290 is formed to reflect the excitation light toward the imaging optical system 220 and transmit a plurality of color lights generated by the color wheel 230.

The light emitted from the light source array 210 is converted into a plurality of color lights via the color wheel 230, and the converted plurality of color lights are light concentrators for high intensity homogenization and scrambling. Pass 240. The light source array 210 may include a laser diode (LD), a light emitting diode (LED), an organic EL (OLED), a phosphor, and the like.

The collecting optical system 250 forms (condenses) the light scrambled through the prism 260 on the microdisplay imager 270.

Light modulated by the microdisplay imager 270 is projected onto the projection screen 100 through the projection lens 280.

Multicolor images are obtained through synchronization between the microdisplay imager 270 and the color wheel 230 (the signal processor controlling the color wheel 230 and the microdisplay imager 270 is not shown).

The color wheel 230 includes a wavelength converting material that converts the excitation light of the light source array 210 into other kinds of wavelengths to implement illumination. For example, the color wheel 230 rotates by a motor (rotational or linear vibration) to sequentially separate colors from the excitation light to generate a plurality of color lights having high luminance. The color wheel 230 may apply light generated by the wavelength converting material to the light concentrator 240.

Hereinafter, the projection screen 100 and the projection system 10 having the same, which can secure a wide viewing angle and have a simpler structure, will be described in more detail.

4 and 5 are a perspective view and a cross-sectional view showing a micro area of the projection screen 100 shown in FIG. 1, respectively.

4 and 5, the projection screen 100 is configured to display an image projected from the projector 200 and includes a lens layer 110 and a reflective layer 120.

The lens layer 110 is formed to collect light (image light) constituting the image projected from the projector 200. The lens layer 110 may be processed into a specific shape through an optical design for condensing, and may be formed of a light transmissive synthetic resin (for example, an ultraviolet curable resin or a thermosetting resin).

The lens layer 110 may have a Fresnel lens structure of a linear type or a circular type. Since the Fresnel lens structure is also disclosed in US Patent No. 6,023,369, a detailed description thereof will be omitted.

A reflective layer 120 is formed on the rear surface of the lens layer 110 to reflect the light projected from the projector 200 toward the front of the projection screen 100. The reflective layer 120 may be disposed to be inclined so that the reflective surface 121 faces the projector 200 to change the direction of light. The reflective layer 120 may be formed by depositing a metal (for example, aluminum) on the rear surface of the lens layer 110 or may be formed in a sheet form and attached to the rear surface of the lens layer 110.

The rear surface of the lens layer 110 is formed in a curved surface so that the light reflected by the reflective layer 120 can be diffused. According to the above structure, light is diffused and reflected by the curved reflective layer 120 corresponding to the rear surface of the lens layer 110.

The lens layer 110 may include a base portion 111 having a predetermined thickness and a convex portion 112 that is formed to protrude in a convex shape from the base portion 111 and forms a rear surface while being formed of the Fresnel lens structure. Can be. Accordingly, the reflective layer 120 covers the convex portion 112 to form a concave reflective surface 121 to diffuse and reflect light incident through the convex portion 112.

The base 111 may be gradually thickened downward so that the convex portion 112 has a protruding shape gradually toward the lower portion of the projection screen 100. The convex portion 112 may be formed to protrude by increasing the thickness of the base portion 111 while maintaining a constant spherical or aspherical surface, as can be seen in the side cross-sectional view of the projection screen 100 of FIG. ) Is inclined toward the projector 200.

The base portion 111 and the convex portion 112 may form one cell, and the cells may be arranged to form a column and a row to form the lens layer 110. . The cells may form a Fresnel lens structure of a linear type or a circular type. In addition, cells forming the same row among the cells may be formed in the same size.

The inclination angle formed by the front surface of the reflective surface 121 and the base portion 111 may be configured to gradually increase toward the above row. That is, the reflective surface 121 of the upper row may be made more inclined toward the projector 200 than the reflective surface 121 of the lower row. This is to allow the projector 200 to project the projection screen 100 from the front lower end, so that light may be reflected toward the front of the projection screen 100 by adjusting the angle of the reflective surface 121.

Light absorbing layer 130 is formed on the upper and lower surfaces of the base portion 111 may be made to absorb light incident from the outside. The light absorption layer 130 may be disposed to cover the reflective layer 120 through printing, deposition, or the like, and may be formed in a black-based color to absorb light. According to the above structure, the light reflected by the reflective layer 120 is projected toward the front of the projection screen 100, and the light incident from the other direction (for example, fluorescent light incident from the top of the projection screen 100) ) Is absorbed by the light absorption layer 130, so that an image having a high contrast ratio may be realized even in a bright room.

A base layer 140 having a predetermined thickness may be disposed on the front surface of the lens layer 110. The base layer 140 may be formed of a light transmissive film covering the lens layer 110, for example, polycarbonate (PC), polyethylene terephthalate (PET), or the like.

The cover layer 150 may be disposed on the front surface of the base layer 140. The cover layer 150 covers and protects the base layer 140 and the lens layer 110 and reduces surface reflection. The cover layer 150 may be formed by printing or depositing a material for coating a surface on the front surface of the base layer 140, or may be formed in a film form and attached to the front surface of the base layer 140.

FIG. 6 is a conceptual view of the lens layer 110 of FIG. 4 as viewed from the portion A. FIG.

Referring to FIG. 6 together with FIG. 4, the reflective layer 120 is disposed to cover the convex portion 112 to form a concave reflective surface 121. Light projected from the projector 200, that is, image light, passes through the lens layer 110 and is reflected by the reflective surface 121. At this time, all of the image light is reflected in different directions by the reflective surface 121 having a concave curved surface. That is, the light is diffused.

According to the present invention having the above-described configuration, the lens layer 110 includes a convex portion 112 forming a rear surface, and the reflective layer 120 covers the convex portion 112 to form a concave reflective surface 121. Formed to diffuse the reflected light, a wider viewing angle can be secured.

In addition, according to the above structure, since a separate layer, that is, a diffusion layer, which is necessary to compensate for a narrow viewing angle is unnecessary, there is an advantage in terms of manufacturing process reduction and cost reduction. In addition, the present invention can obtain a uniform diffusion effect as compared to the structure having a roughened diffusion layer.

The projection screen and the projection system having the same described above are not limited to the configuration and method of the embodiments described above, but the embodiments are configured by selectively combining all or part of the embodiments so that various modifications can be made. May be

Claims (12)

A projection screen that displays an image projected from a projector,
The projection screen,
A lens layer formed of synthetic resin; And
A reflection layer formed on a rear surface of the lens layer and configured to reflect light projected from the projector,
The back of the lens layer is a projection screen, characterized in that the curved surface so that the light reflected by the reflective layer can be diffused. The method of claim 1,
The lens layer includes a base portion having a predetermined thickness and a convex portion protrudingly protruding from the base portion to form a back surface.
And the reflective layer covers the convex portion to form a concave reflective surface. The method of claim 2,
The base portion is a projection screen, characterized in that formed gradually thicker toward the bottom so that the convex portion is protruding gradually toward the bottom. The method of claim 3, wherein
And a light absorbing layer disposed to cover the upper and lower surfaces of the base part and absorbing light incident from the outside. The method of claim 3, wherein
The base portion and the convex portion form one cell,
And the cells are arranged in rows and columns to form the lens layer. 6. The method of claim 5,
Projection screen, characterized in that the cells forming the same row of the cells are formed in the same size. 6. The method of claim 5,
And the inclination angle formed between the reflective surface and the front surface of the base portion gradually increases as the row goes up. The method of claim 1,
And the lens layer comprises fresnel lenses of a linear type or a circular type. The method of claim 1,
A base layer formed on the front surface of the lens layer; And
And a cover layer disposed to cover the base layer and configured to reduce surface reflection. A projection screen that displays an image projected from a projector,
The projection screen,
A lens layer formed of a synthetic resin and having a convex portion protruding convexly to form a rear surface thereof; And
A reflection layer formed on a rear surface of the lens layer to reflect light projected from the projector,
And the reflective layer covers the convex portion to form a concave reflective surface to diffuse the reflected light. A projector configured to enlarge and project an image; And
A projection system, adapted to display the image projected from the projector, comprising a projection screen according to any one of claims 1 to 10. 12. The method of claim 11,
And the reflective layer is disposed inclined such that the reflective surface faces the projector.
KR1020120037524A 2012-04-10 2012-04-10 Projection screen and projection system having the same KR20130115005A (en)

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KR1020120037524A KR20130115005A (en) 2012-04-10 2012-04-10 Projection screen and projection system having the same

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160087654A (en) 2015-01-14 2016-07-22 주식회사 도담시스템스 Immersive display system and the method thereof
JP2018097119A (en) * 2016-12-12 2018-06-21 内田　龍男 Screen
CN111624843A (en) * 2020-07-28 2020-09-04 成都菲斯特科技有限公司 Optical projection screen and projection system
WO2022244990A1 (en) * 2021-05-17 2022-11-24 삼성전자주식회사 Screen for projector and manufacturing method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160087654A (en) 2015-01-14 2016-07-22 주식회사 도담시스템스 Immersive display system and the method thereof
JP2018097119A (en) * 2016-12-12 2018-06-21 内田　龍男 Screen
CN111624843A (en) * 2020-07-28 2020-09-04 成都菲斯特科技有限公司 Optical projection screen and projection system
WO2022244990A1 (en) * 2021-05-17 2022-11-24 삼성전자주식회사 Screen for projector and manufacturing method thereof

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