JP4412527B2 - screen - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screen for projecting an image of a projector having a function of enlarging and projecting an image or image such as a projector.
[0002]
[Prior art]
Conventionally, when projecting an image of a projector on a transparent place such as glass, a method of projecting an image on a film surface pasted on a glass surface to be projected (see, for example, Patent Document 1), or A method of projecting an image on the glass surface by reducing the visible light transmittance by depositing metal or the like on the glass surface to be projected, or using a glass with a liquid crystal layer inside, and applying an electric field to the liquid crystal layer By changing the arrangement, for example, white turbidity and a method of projecting an image on the white turbid portion (see, for example, Patent Document 2), or an electrochromic layer made of tungsten oxide (WO ₃ ) is provided inside, and the electrochromic layer There is a method in which an electrochromic layer is colored by applying a voltage to it, and an image is projected onto that portion by reducing the light transmittance of the glass.
[0003]
[Patent Document 1]
JP 2001-242546 A (page 2-3)
[0004]
[Patent Document 2]
JP 2000-347222 A (page 2-4)
[0005]
[Problems to be solved by the invention]
However, in the method of attaching a film, when a film having a high light transmittance is used, there is a case where the projected image is hardly seen in a place exposed to direct sunlight. In addition, when a film with a low light transmittance is used, the visibility of the projected image is improved, but only when the film is pasted, the light transmittance is low during projection, for example, a store. Has a problem of hindering visibility from the outside or the inside. In addition, even when metal or the like is vapor-deposited on the glass surface to be projected to lower the visible light transmittance and the image is projected onto that portion, the vapor-deposited portion has a low light transmittance and hinders visibility from the outside or inside. It had the problem that. Also, in the method of providing a liquid crystal layer, it is necessary to always apply an electric field while changing the alignment of the liquid crystal, and when maintaining either state during projection or during projection. There was always a problem of needing electric power.
[0006]
In addition, as a conventional method for providing an electrochromic layer, there has been a method using a WO ₃ film as an electrochromic layer. However, when colored, the WO ₃ film is colored blue. Had a problem of becoming blue and having extremely poor color reproducibility.
[0007]
The present invention has been made to solve the above-described problems. The color reproducibility and visibility of the projected image are good, and the light transmittance is high and the visual recognition from outside is not performed during projection. An object is to provide a low energy consumption projection screen that does not need to be interrupted and does not need to be constantly supplied with power.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the 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 the electro A chromic layer and an electrolyte layer are provided, and a voltage is applied to the electrochromic layer so as to have a substantially uniform reflectance in the visible light region, whereby a screen capable of projecting an image is obtained.
[0009]
Furthermore, 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. Furthermore, the electrochromic layer was formed in a slit shape or a dot shape. The electrochromic layer was formed of nickel oxide or a nickel magnesium alloy.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings of FIGS. The present invention is not limited to this embodiment.
[0011]
FIG. 1 is a schematic partial cross-sectional view showing a configuration of an embodiment of a screen using an electrochromic material according to the present invention (hereinafter, electrochromic screen). As shown in the figure, the electrochromic screen 1 includes an electrochromic layer 4 and an electrolyte layer 5 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 have to be joined and integrated. For example, a solid electrolyte layer 5 is laminated and laminated on the first substrate 2A and the electrochromic layer 4 joined together, or the first substrate 2A on which the electrode layer 3 and the electrochromic layer 4 are formed. The gap formed by facing the second substrate 2B may be filled with a liquid or gel electrolyte layer 5 or the like. Further, the first substrate 2A and the second substrate 2B have translucency, for example, glass, acrylic resin, styrene resin, polycarbonate resin, 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 such as indium-tin oxide (ITO), fluorine-tin oxide (FTO), zinc oxide, tin oxide, transparent conductive polymer, or the like can be used. As the electrochromic layer 4, a material having a substantially uniform reflectance in the visible light region, such as nickel oxide or 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 where the electrochromic layer 4 is formed on the electrode layer 3 and a portion where the electrochromic layer 4 is not formed on the translucent first substrate 2 </ b> A on which the electrode layer 3 is formed. Are formed in a slit shape, that is, such that the gaps appear alternately and continuously. The gap between the electrochromic layers is preferably 1 mm or less. If this value is larger than 1 mm, the screen resolution tends to decrease. A screen in which the slit-like electrochromic layer 4 is formed so as to be vertically striped in the vertical direction when viewed from an observer in front of the screen has high light diffusibility in the horizontal direction and low light diffusivity in the vertical direction. There is a characteristic. As a result, the visibility of the projected image is improved even when the screen is obliquely tilted from side to side. In the present embodiment, as an example, the electrochromic layer 4 is formed in a line shape so that the portion where the electrochromic layer 4 is formed and the portion where the gap is not formed are in a parallel state. For example, the shape of the electrochromic layer 4 may be a wave shape or a rectangle depending on the desired effect.
[0015]
FIG. 3 is a partial schematic view 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 substrate 2A having translucency on which the electrode layer 3 is formed. The dots are circular, the diameter is 1 mm or less, and the size of each dot varies widely. By varying the size of the dots, light is scattered on the screen surface. In this example, circular dots are used as an example, but the shape is not particularly specified, such as a triangle, quadrangle, or irregular shape. Is preferably circular.
[0016]
【The invention's effect】
According to the present invention, the color reproducibility and visibility of the projected image are good, the light transmittance is high and the visual recognition from the outside is not hindered during projection, and it is not necessary to always supply power. In addition, an electrochromic device serving as a low energy consumption projection screen can be provided. Furthermore, for example, a glass window used in a store can be replaced with a screen, so that information can be transmitted as an advertising medium by projecting video, and visibility is also possible from the outside and inside while not projecting. Highly transparent glass window can be provided. In addition, it is possible to provide a lightweight and flexible screen by thinning the resin used as the substrate. Furthermore, by changing the slit and dot patterns, it is possible to improve the visibility of the top and bottom, left and right, for example, and while projecting images, from the inside through the electrochromic screen, It is also possible to look inside from the outside. By forming the electrochromic layer from nickel oxide or a 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 the projected image can be provided. .
[Brief description of the drawings]
FIG. 1 is a partial sectional view schematically showing the structure of a screen using the electrochromic element of the present invention. FIG. 2 is a partial schematic view of an electrochromic screen having a slit-like electrochromic layer. Partial schematic diagram of an electrochromic screen having an electrochromic layer formed
DESCRIPTION OF SYMBOLS 1 Electrochromic screen 2A 1st board | substrate 2B 2nd board | substrate 3 Electrode layer 4 Electrochromic layer 5 Electrolyte layer

Claims (6)

Between the two substrates which the electrode layer is formed, provided with a electrolyte layer and the electrochromic layer, Ri material der that the electrochromic layer reflects visible light when a voltage is applied,
The screen , wherein the electrochromic layer is a nickel magnesium alloy . The screen according to claim 1 , 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 3 , wherein each of the electrochromic layers has a different size from each other. Screen according to any one of claims 1 to 4, characterized in that at least one of the substrate is formed by material having high transmittance in the visible light region. The material having high transmittance is glass or a material having translucency such as acrylic resin, styrene resin, polycarbonate resin, polymethylpentene resin, methyl methacrylate / styrene copolymer resin, etc. The screen according to claim 5 .

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