KR102221282B1 - Screen for projection and Display Device having the same - Google Patents

Abstract

The projection screen according to the present embodiment comprises a bezel unit constituting the front edge of the projection screen; A frame unit coupled to the bezel unit and forming a rear surface of the projection screen; And a screen film member comprising a diffusion coating layer fixed to the rear surface of the frame unit to apply a tension of a predetermined size or more, and having an uneven portion formed on an outermost surface facing the user.

Description

Screen for projection and display device having the same

The present invention relates to a projection screen and a display device having the same.

Data projectors are widely used as image projection devices that project a PC screen, a video image, or an image based on image data stored in a memory card or the like onto the screen. This projector condenses light emitted from a light source onto a micromirror display element called a digital micromirror device (DMD) or a crystal plate to display a color image on a screen.

Recently, as a beam projector using a laser light source capable of realizing a large screen of 100 inches or more, as a display device capable of playing video through data reception as well as TV reception, a product having a distance between the light source and the display panel of about 50 cm has been developed. In the case of such a display device, the distance between the screen unit fixed to the wall and the light source module including the light source device can be configured close, reducing the limitation of the installation space, and it is difficult to implement a 100-inch LCD or OLED. There is an advantage in that it is easy to implement the above large screen.

As an example of such a display device, Korean Patent Laid-Open No. 10-2013-0087325 (published on Aug. 6, 2013) discloses a technique of fixing a projection screen on a wall and installing an image projection device in a close position. . In the above disclosed patent, a technology for preventing distortion of the screen film by installing a honeycomb-shaped support member on the back side of the screen is proposed as a structure to prevent deformation such as thermal deformation, bending, and distortion that may occur in the large screen screen. have.

However, since the screen film member used in the projection screen does not have a high surface hardness, hard coating is performed on the outermost part exposed to the outside. Although hard coating has the advantage of reinforcing the strength of the screen film member, the surface is smooth and has high reflectivity, so when outputting a dark screen, surrounding objects such as a mirror are reflected, or people passing in front of the screen are reflected. I can.

In addition, when used in a bright room or in an environment exposed to direct sunlight, since an optical screen structure composed of several layers is implemented in order to solve the problem caused by a decrease in contrast, many processes and production costs are increased.

In addition, the so-called ceiling see-through phenomenon in which an image from a single-focus projector is reflected on the surface of the screen and is reflected on the ceiling has a problem that causes inconvenience when a viewer watches an image, and thus, improvement is required.

The present embodiment provides a projection screen having an improved structure and a display device having the same, which can be configured relatively inexpensively, and minimizes the phenomenon of seeing through the ceiling during use.

The projection screen according to the present embodiment includes a light-transmitting layer formed of a light-transmitting material; And a diffusion coating layer in which uneven portions are formed on the outermost surface of the light transmitting layer facing the user.

The projection screen according to the present embodiment includes a colored layer disposed on the opposite side of the coating surface of the diffusion coating layer of the light transmitting layer; A Fresnel lens layer formed on one surface of the colored layer; A thin film deposited reflective layer formed on an inclined surface of the Fresnel lens layer; And a color coating layer having a black color surrounding the thin film deposition reflective layer.

The thin film deposition reflective layer may be formed of an aluminum material.

The diffusion coating layer may be formed by a wet coating on one surface of the light transmitting layer.

Alternatively, the diffusion coating layer may be formed by using a mold with uneven uneven portions formed on the surface.

Alternatively, the diffusion coating layer may include impurities for light diffusion therein, and uneven portions formed on the surface may be formed by the impurities.

The light transmitting layer may be formed of polyethylene terephthalate (PET).

The display device according to the present embodiment includes a CRT (Cathode Ray Tube) projection method, an LCD (Liquid Crystal Display) projection method, an LCoS (Liquid Crystal On Silicon) projection method, and a DLP (Digital Light Processing) an image projection device configured in any one of projection methods; And a projection screen configured as described above that reflects the image output from the image projection device.

Since the outermost layer is formed as a diffusion layer so that the light incident from the display device and environmental lighting such as illumination light can diffuse while maintaining the same surface hardness as the existing projection screen, it is possible to prevent the occurrence of ceiling see-through. I can.

1 and 2 are views schematically showing a display device according to the present embodiment;
3 is a front view showing a projection screen according to the present embodiment, and,
4 is a schematic cross-sectional view showing the structure of a screen film member of the display device according to the present embodiment.

Hereinafter, a projection screen and a display device including the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings show exemplary forms of the present invention, which are only provided to describe the present invention in more detail, and thus the technical scope of the present invention is not limited thereto.

In addition, regardless of the reference numerals, identical or corresponding components are given the same reference numbers, and duplicate descriptions thereof will be omitted, and the size and shape of each component member shown for convenience of explanation may be exaggerated or reduced. have.

Meanwhile, terms including ordinal numbers such as first or second may be used to describe various components, but the components are not limited by the terms, and the terms refer to one component from another component. It is used only for distinguishing purposes.

1 and 2 are views schematically showing a display device according to the present embodiment, FIG. 3 is a front view showing a projection screen according to the present embodiment, and FIG. 4 is a view showing a display device according to the present embodiment. It is a cross-sectional view schematically showing the structure of the screen film member.

1 is a conceptual diagram showing an operating state of a display device related to an embodiment of the present invention, and FIG. 2 is a schematic side view of FIG. 1.

1 and 3, the projection screen 100 according to an embodiment of the present invention may include a bezel unit 110, a frame unit 120, and a screen film member 130, and the bottom surface The light projected from the image projection device 10 fixed to (B) is imaged and outputs an image. The projection screen 100 may be fixedly installed on the wall surface W as shown.

The image projection device 10 is a display device that allows an image generated by an image device or the like to pass through a projection lens or the like to be displayed on the projection screen 100. According to a method of displaying an image, the image projection device 10 is a CRT (Cathode Ray Tube) projection method, an LCD (Liquid Crystal Display) projection method, an LCOS (Liquid Crystal On Silicon) projection method. And DLP (Digital Light Processing) projection method.

The CRT projection method is a method of projecting the image signal of an external device amplified from a CRT on a screen, and is also called a beam projector, and there are a single tube type with one CRT and a three tube type with three CRTs. In addition, the LCD projection method uses the electro-optical properties of liquid crystals in a display device. After each light source (red, green, and blue) from a lamp passes through a transmissive liquid crystal panel, it is combined into a single image through a polarizing prism and displayed on the screen. It is a method of enlarged projection. In addition, the Elkos projection method uses a silicon wafer instead of the glass at the bottom of the existing liquid crystal display (LCD) device, and uses an LCoS (reflective liquid crystal panel) chip on which an electronic circuit is formed. The light source (red, green, blue) that came out is reflected from the surface of the Elkos chip, then synthesized into a single image through a polarizing prism and projected on the screen. In addition, the DLP projection method uses a DMD (Digital Mirror Device) chip developed by Texas Instruments (TI, USA), and the light generated from the lamp passes through the color wheel and is reflected on the DMD chip. It is a method that is expanded and projected. However, the image projection apparatus 10 related to the display device according to an embodiment of the present invention is not limited to the above-described projection method, and may include other various projection method image projection devices. The image projection apparatus 10 according to the present embodiment may be provided as a projector having an ultra short focus of a front projection method.

According to this embodiment, the image projection device 10 may be fixedly installed at a position close to the projection screen 100, and as shown in FIGS. 1 and 2, the floor near the projection screen 100 It can be installed on the side (B) side. However, it is not limited thereto, and it may be installed on the ceiling surface within a range that satisfies a certain distance and angle condition from the projection screen 100.

The projection screen 100 is fixedly installed on the wall surface W as shown in FIGS. 1 and 3 and may include a bezel unit 110, a frame unit 120, and a screen film member 130. .

According to this embodiment, the bezel unit 110 and the frame unit 120 have a structure that can be disassembled and assembled. Therefore, the bezel unit 110 and the frame unit 120 are shipped in the form of parts when the product is shipped, and thus may be configured to be assembled at the installation site.

The bezel unit 110 forms an outer edge of the projection screen 100 and may be formed to have a thickness as thin as possible. The length of the bezel unit 110 may be determined according to the resolution of the output image, and in general, it may be configured such that the aspect ratio of the bezel unit 110 is 16:9 so as to suit the F-HD (Full HD) resolution. . However, this is not limited, and this ratio may be changed as necessary. For example, when supporting a cinema scope aspect ratio, the aspect ratio may be configured to be 21:9.

The bezel unit 110 forms a border area of the projection screen 100 and at the same time covers the upper, lower, left and right ends of the screen film member 130 so that the folded portion of the frame unit 120 is not visible from the user's side. By playing a role of giving, the appearance quality of the projection screen 100 may be improved.

The bezel unit 110 may be formed of a lightweight metal such as aluminum, or may be formed of a synthetic resin material having excellent heat resistance. The bezel unit 110 may be connected to the frame unit 120 by a fastening member such as a screw, or may be coupled by providing an uneven structure capable of fitting and coupling.

The frame unit 120 is assembled with the bezel unit 110, and may be formed in a structure capable of being divided into four, like the bezel unit 110, or may be integrally configured. According to the present embodiment, the frame unit 120 is formed of a lightweight, high-strength material such as aluminum, and a space portion is formed therein to minimize the weight of parts. The frame unit 120 may fix the screen film member 130 in a state in which tension is applied using an elastic member from the rear side where the user cannot see.

As described above, when the frame unit 120 is formed of aluminum, it is excellent in non-combustibility because there is no risk of spreading fire even in the event of a fire, and it is excellent in durability and stability against chemical damage. No chemical transformation occurs. On the other hand, when using the projection screen 100 for a long time, since aluminum may react with oxygen in the air to cause whitening, the frame unit 120 may additionally perform fluorine coating or the like.

The screen film member 130 may have upper and lower and left and right ends fixed to the frame unit 120 as shown in FIGS. 3 and 4. The screen film member 130 may be fixed to the frame unit 120 in various ways. Although not shown, the edge portion is formed in the shape of a cross (+), and a plurality of through holes are formed at the protruding end side. The eyelet may be coupled to the through hole, and may be elastically fixed to the frame unit 120 using an elastic member or the like.

In addition, the through holes are disposed at positions close to the upper, lower, left and right ends, and each of the through holes may be configured to be symmetrical to each other. That is, it is preferable that the through holes formed on the upper side and the lower side, and the left and right sides are formed in the same number, and this is to allow the screen film member 130 to be stretched tightly by the tension added by a predetermined elastic member. .

As shown in FIG. 4, the screen film member 130 includes a diffusion coating layer 131, a light transmission layer 132, a colored layer 133, a Fresnel lens layer 134, a thin film deposition reflective layer 135, and A color coating layer 136 may be included.

The diffusion coating layer 131 may be formed on a surface exposed to the outermost side of the screen film member 130, and may be formed on the surface of the light transmitting layer 132 by coating. The diffusion coating layer 131 may form a coating layer in various ways such as a wet method or a spray method, and the surface may have a hardness of 2H or more based on the Vickers hardness. According to this embodiment, the diffusion coating layer 131 is preferably formed by wet coating.

The diffusion coating layer 131 largely performs two functions.

First, as a protective layer for protecting each layer constituting the screen film member 130, it is configured to have a hard surface hardness as described above, and serves to protect the screen film member 130 from external impacts such as scratches. Perform.

Second, by configuring the exposed surface to include uneven portions, it plays a role of diffusing incident light. That is, the screen film member 130 may enter not only the light projected from the image projection apparatus 10 but also external light such as illumination light. These lights are reflected from the hard coating layer and transmitted to the user in the screen with the outermost hard coating layer as before. In particular, in the case of a relatively bright image among the image images projected by the image projection apparatus 10, a so-called ceiling reflection phenomenon is caused by reflection from the hard coating layer and reflected on the ceiling (C, see FIG. 2). However, according to the present embodiment, since light is scattered by surface diffusion on the surface of the diffusion coating layer 131, the incident light is divided into several places and reflected as shown in FIG.

In addition, the diffusion coating layer 131 may have an uneven surface, and a plurality of impurities 131a for diffusion of light may be distributed in the interior of the coating material as illustrated in FIG. 4. Therefore, the diffusion coating layer 131 can perform the role of the existing diffusion layer together. That is, the internal diffusion function may be implemented by a difference in refractive index between the impurities 131a such as resin and beads forming the coating material.

On the other hand, as described above, a method of forming irregularities on the surface may be variously configured.

For example, the impurities 131a may form uneven surface irregularities, or may be implemented by forming surface irregularities by means of a mold having intaglio irregularities. At this time, haze due to surface diffusion may be 10% or more, and the total haze of the diffusion film may be 80% or more. Here, the haze is for indicating the quality of the appearance quality such as painting. For example, microstructures of small paints that are not sufficiently dispersed in the painting industry may cause a phenomenon in which the painted surface appears hazy. The grains of this paint disperse the light reflected off the high-gloss surface with low brightness, and we call this phenomenon Milkness or Haze. Haze may be measured using a predetermined measuring device, and using this measuring device, as well as haze of the sample surface, gloss and mirror reflection can be measured.

The light-transmitting layer 132 may be formed of a light-transmitting material, and is preferably formed of a polyethylene terephthalate (PET) material. However, this is not limited, and any material such as glass or acrylic that can transmit light can be used. In addition, the light transmission layer 132 does not necessarily have a transmittance of light close to 100%, and may have a transmittance lower than this.

The colored layer 133 is disposed inside the light transmitting layer 132 and between the Fresnel lens layer 134. The colored layer 133 is for increasing the contrast ratio of the image projected by the image projection device 10, and also serves to form the color of the screen film member 130 according to the present embodiment to be close to black. I can. If the colored layer 133 is provided in this way, it is possible to improve the color reproduction power of black for a dark background screen, etc., even if the color of the screen is formed close to silver or gray due to the thin film deposition reflective layer 135 to be described later. In fact, it can be formed as a screen that is close to black to the user's eyes, thereby improving the degree of freedom in design of the product.

The Fresnel lens layer 134 reflects, diffuses, and transmits light from the image projection apparatus 10 together with the thin film deposition reflective layer 135 to the user side. At this time, the thin film deposition reflective layer 135 is shown as having a constant inclination in FIG. 4, but in reality, since the incident angle of light of the image projection device 10 is different depending on the position, the inclination angle is different for each height. can do. The thin film-deposited reflective layer 135 may be formed of aluminum, but is not limited thereto, and may be substituted with another material having high reflectivity and excellent heat resistance, if necessary.

By forming the thin film-deposited reflective layer 135 on the inclined surface of the Fresnel lens layer 134, luminance can be increased even in a bright space. Specifically, the luminance can be improved by about 5.6 times due to the slope reflection effect, and the peak gain can be improved by about 5.2 times.

The color coating layer 136 may be formed to surround the thin film deposition reflective layer 135 formed on the inclined surface of the Fresnel lens layer 134. Images output from the image projection apparatus 10 may pass through the color coating layer 136 and be sequentially incident. The color coating layer 136 functions to prevent oxidation of the thin film-deposited reflective layer 135 and is preferably composed of a black color.

As described above, the display device provided with the projection screen 100 can prevent thermal deformation, warpage, and distortion due to temperature, humidity and other environmental factors, and can prevent high rigidity, smoothness, light weight, non-flammability and durability. Excellent physical properties.

In particular, by the configuration of the diffusion coating layer 131 formed unevenly on the surface exposed to the outermost surface, as well as external light including illumination light, as well as light from the image projection device 10 is scattered and reflected from the surface, the ceiling (C) (Fig. 2) can eliminate the occurrence of the so-called ceiling reflection phenomenon. As a result of the experiment, when using the screen film member 130 having the diffusion coating layer 131 according to the present embodiment, it was confirmed that light of 28 lux, which is significantly lower than the illuminance of 113 lux of the screen according to the existing technology, is reflected to the ceiling C. , No see-through of the ceiling occurred.

Although the embodiments according to the present embodiment have been described above, these are merely exemplary, and those of ordinary skill in the art will understand that various modifications and equivalent ranges of embodiments are possible therefrom. Therefore, the true technical protection scope of this embodiment should be determined by the following claims.

10; An image projection device 100; Projection screen
110; Bezel unit 120; Frame unit
130; Screen film member 131; Diffusion coating layer
132; Light transmitting layer 133; Colored layer
134; Fresnel lens layer 135; Thin film deposited reflective layer
136; Color coating layer

Claims (9)

A light-transmitting layer formed of a light-transmitting material; And
A diffusion coating layer in which an uneven portion is formed on an outermost surface of the light transmitting layer facing a user;
A colored layer disposed on the rear surface of the light transmitting layer;
A Fresnel lens layer disposed on the rear surface of the colored layer and including an inclined surface on the rear surface;
A thin film deposited reflective layer formed on the entire surface of the inclined surface; And
It includes a color coating layer having a black color surrounding the rear surface of the thin film deposition reflective layer,
The diffusion coating layer,
Contains a number of impurities including resin and beads for light diffusion inside,
The uneven irregularities formed on the surface are formed by the impurities,
The material of the impurity and the material of the rest of the diffusion coating layer have a different refractive index,
The refractive indexes between the plurality of impurities are different from each other,
The total haze of the diffusion coating layer is 80% or more,
A projection screen having a haze of 10% or more due to surface diffusion of the diffusion coating layer.
delete The method of claim 1, wherein the thin film deposited reflective layer,
A projection screen made of aluminum.
The method of claim 1, wherein the diffusion coating layer,
A projection screen formed by a wet coating on one side of the light-transmitting layer.
The method of claim 1, wherein the diffusion coating layer,
A projection screen in which the uneven parts formed on the surface are formed using a mold.
delete The method of claim 1, wherein the light transmitting layer,
Screen for projection made of polyethylene terephthalate (PET).
CRT (Cathode Ray Tube) projection method, LCD (Liquid Crystal Display) projection method, LCoS (Liquid Crystal On Silicon) projection method, and DLP (Digital Light Processing) projection method. An image projection device configured; And
A display device comprising: the projection screen according to any one of claims 1, 3 to 5, and 7 for reflecting the image output from the image projection device.
delete

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