JP2004252265A - Screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection screen of low energy consumption wherein the color reproducibility and visibility of a projected image are satisfactory, light transmittance is high when projection is not performed, visual confirmation from the outside is not obstructed and it is not necessary to constantly supply power. <P>SOLUTION: The projection screen on which the video of a projector having a function for expanding and projecting an image and video is projected is constituted of: two translucent substrates each having an electrode layer formed on at least one surface thereof; and an electrochromic layer and an electrolyte layer formed in an interposed state between the substrates. Voltage is applied to the electrochromic layer, which is made to be in a state having nearly uniform reflectance in the visible region to impart the function to expand and project the image and video onto the screen. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a screen for projecting an image of a projector, such as a projector, having a function of enlarging and projecting an image or an image.
[0002]
[Prior art]
Conventionally, when projecting an image of a projector onto a transparent place such as glass, a method of attaching a film to a glass surface to be projected and projecting the image on the attached film surface (for example, see Patent Document 1), or A method of lowering the visible light transmittance by depositing metal or the like on the glass surface to be projected and projecting an image on that part, or using a glass with a structure in which a liquid crystal layer is provided inside, applying an electric field to the liquid crystal layer, By changing the arrangement, for example, the image is made cloudy and a video is projected on the clouded portion (for example, see Patent Document 2), or an electrochromic layer made of tungsten oxide (WO ₃ ) is provided inside, and the electrochromic layer is formed. There is a method in which an electrochromic layer is colored by applying a voltage to the substrate, and an image is projected on the portion by lowering the light transmittance of the glass.
[0003]
[Patent Document 1]
JP 2001-242546 A (page 2-3)
[0004]
[Patent Document 2]
JP-A-2000-347222 (pages 2-4)
[0005]
[Problems to be solved by the invention]
However, in the method of attaching a film, when a film of a type having a high light transmittance is used, the projected image may hardly be seen in places exposed to direct sunlight. In addition, when a film of a type having a low light transmittance is used, the visibility of the projected image is improved, but during the time when the projection is not performed, the light transmittance is reduced only in a portion where the film is attached, such as a store. Has a problem that visibility from the outside or inside is hindered. Also, in the method of lowering the visible light transmittance by depositing metal or the like on the glass surface to be projected, and projecting an image on that portion, the deposited portion has a low light transmittance and hinders visibility from the outside or inside. There was a problem that. In addition, in the method of providing a liquid crystal layer, it is necessary to always apply an electric field while the arrangement of liquid crystal is being changed, and when maintaining either state during projection or non-projection, There was a problem that power was always required.
[0006]
In the method of providing an electrochromic layer, a conventional method uses a WO ₃ film as an electrochromic layer. However, since the WO ₃ film is colored blue when colored, even if white is projected, a projected image is formed. Had a problem that the color was blue and the color reproducibility was extremely poor.
[0007]
The present invention has been made in order to solve the above-described problems, and has good color reproducibility and visibility of a projected image, and has high light transmittance during non-projection so that the image can be visually recognized from the outside. It is an object of the present invention to provide a low-energy-consumption projection screen that does not hinder and does not need to be constantly supplied with power.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a screen of the present invention is a screen for projecting an image of a projector having a function of enlarging and projecting an image or an image, and an electro-screen is provided between two substrates on which electrode layers are formed. A screen capable of projecting an image was provided by providing a chromic layer and an electrolyte layer, and applying a voltage to the electrochromic layer to have a substantially uniform reflectance in the visible light region.
[0009]
Further, the substrate was formed of transparent glass or transparent resin. Specific examples include translucent resins such as acrylic resins, styrene resins, polycarbonate resins, polymethylpentene resins, and methyl methacrylate / styrene copolymer resins. Further, the electrochromic layer was formed in a slit shape or a dot shape. Further, the electrochromic layer was formed of nickel oxide or a nickel magnesium alloy.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS. Note that the present invention is not limited to this embodiment.
[0011]
FIG. 1 is a schematic partial sectional view showing a configuration of an embodiment of a screen using an electrochromic material according to the present invention (hereinafter, referred to as an electrochromic screen). As shown, the electrochromic screen 1 has an electrochromic layer 4 and an electrolyte layer 5 provided between a first substrate 2A on which an electrode layer 3 is formed and a second substrate 2B.
[0012]
Here, the electrochromic layer 4 and the electrolyte layer 5 and the second substrate 2B and the electrolyte layer 5 do not necessarily need to be joined and integrated. For example, the first substrate 2A and the electrochromic layer 4 are joined and integrated, and the solid electrolyte layer 5 is overlapped and laminated, or the first substrate 2A on which the electrode layer 3 and the electrochromic layer 4 are formed is formed. It may be formed by filling the gap formed by facing the second substrate 2B with the liquid or gel electrolyte layer 5. The first substrate 2A and the second substrate 2B have a light-transmitting property. For example, glass or an acrylic resin, a styrene resin, a polycarbonate resin, a polymethylpentene resin, methyl methacrylate / styrene A light-transmitting material such as a copolymer resin can be used.
[0013]
As the electrode layer 3, a transparent conductive film, for example, indium-tin oxide (ITO), fluorine-tin oxide (FTO), zinc oxide, tin oxide, a transparent conductive polymer, or the like can be used. As the electrochromic layer 4, a material having substantially uniform reflectance in a visible light region, such as nickel oxide or a nickel magnesium alloy, can be used. As the electrolyte layer 5, a solid, liquid, or gel polymer electrolyte such as Nafion (trademark) can be used.
[0014]
FIG. 2 is a partial schematic view of an electrochromic screen 1 in which an electrochromic layer is formed in a slit shape. In FIG. 2, the electrochromic layer 4 is a portion of the light-transmitting first substrate 2A on which the electrode layer 3 is formed, where the electrochromic layer 4 is formed on the electrode layer 3 and where the electrochromic layer 4 is not formed. Are formed alternately and continuously, that is, formed in a slit shape. It is preferable that the gap between the electrochromic layers is 1 mm or less. If this value is larger than 1 mm, the screen resolution tends to decrease. The screen in which the slit-like electrochromic layer 4 is formed so as to form vertical stripes in the vertical direction when viewed from the viewer in front of the screen has high light diffusivity in the left and right directions and low light diffusivity in the vertical direction. There is a characteristic that. As a result, the visibility of the projected image is improved even when the screen is inclined from left to right. In this embodiment, as an example, the shape of the electrochromic layer 4 is linearly formed such that a portion where the electrochromic layer 4 is formed and a portion of a gap where the electrochromic layer 4 is not formed are in a parallel state. For example, the shape of the electrochromic layer 4 may be corrugated or rectangular depending on the desired effect.
[0015]
FIG. 3 is a partial schematic diagram of an electrochromic screen 1 in which an electrochromic layer is formed in a dot shape. In FIG. 3, the electrochromic layer 4 is formed in a dot shape on the electrode layer 3 of the first light-transmitting substrate 2A on which the electrode layer 3 is formed. The dots are circular and have a diameter of 1 mm or less, and the size of each dot varies in size. By varying the size of the dots, light is scattered on the screen surface, and in the present embodiment, circular dots are used as an example.However, the shape is not particularly specified, such as a triangle, a square, and an irregular shape. Is preferably circular.
[0016]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the color reproducibility and visibility of the projected image are good, and the light transmittance is high during non-projection, so that visual recognition from the outside is not hindered, and there is no need to constantly supply power. Thus, an electrochromic element serving as a projection screen with low energy consumption can be provided. In addition, by replacing the glass window used in stores for example with a screen, information can be transmitted as an advertising medium by projecting images, and visibility can be seen from outside and inside when not projecting. High transparent glass window can be provided. Further, by reducing the thickness of the resin used as the substrate, a lightweight and flexible screen can be provided. Furthermore, by changing the pattern of slits and dots, for example, it is possible to improve the visibility in the up and down, left and right, and during projection of an image, from the inside to the outside through the electrochromic screen, and It is also possible to see inside from outside. By forming the electrochromic layer from a nickel oxide or nickel magnesium alloy, the electrochromic layer has a substantially uniform reflectance in the visible light region, and a screen with good color reproducibility and visibility of a projected image can be provided. .
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view schematically showing a configuration of a screen using an electrochromic device of the present invention. FIG. 2 is a partial schematic view of an electrochromic screen having a slit-like electrochromic layer. Partial schematic view of an electrochromic screen having an electrochromic layer formed.
DESCRIPTION OF SYMBOLS 1 Electrochromic screen 2A First substrate 2B Second substrate 3 Electrode layer 4 Electrochromic layer 5 Electrolyte layer

Claims (7)

An electrochromic layer and an electrolyte layer are provided between the two substrates on which the electrode layers are formed, and the electrochromic layer is a material having a substantially uniform reflectance in a visible light region when a voltage is applied. screen. The screen according to claim 1, wherein the electrochromic layer is nickel oxide. The screen according to claim 1, wherein the electrochromic layer is a nickel magnesium alloy. The screen according to any one of claims 1 to 3, wherein the electrochromic layer is formed in a slit shape. The screen according to claim 1, wherein the electrochromic layer is formed in a dot shape. The screen according to claim 1, wherein at least one of the substrates is formed of a material having a high transmittance in a visible light region. The material having high transmittance is glass or a light-transmitting material such as an acrylic resin, a styrene resin, a polycarbonate resin, a polymethylpentene resin, and a methyl methacrylate / styrene copolymer resin. The screen according to claim 6, wherein

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