JP2019095514A - Screen and display device - Google Patents

Abstract

To impart a design property to a screen capable of reducing a speckle.SOLUTION: A screen 40 includes a sheet member 40x having: a control layer 55x containing a plurality of particles 60 or a liquid; electrodes 41, 42 used to apply voltage to the control layer 55x; and a decorative layer 45 laminated on the control layer 55x. According to the voltage applied to the control layer 55x, at least one of movement and rotation of the plurality of particles 60 occurs inside the control layer 55x, or according to the voltage, the liquid moves inside the control layer 55x.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a screen and a display device for displaying an image.

  For example, as disclosed in Patent Document 1 and the following, a projector using a coherent light source is widely used. As coherent light, laser light emitted from a laser light source is typically used. If the image light from the projector is formed by coherent light, speckle will be observed on the screen illuminated with the image light. Speckles are recognized as speckle patterns and degrade the display image quality. In Patent Document 1, in order to reduce speckle, the incident angle of image light incident on each position on the screen changes with time. As a result, a diffusion pattern having no correlation is superimposed on the screen, and speckle can be reduced.

  As another method for reducing speckle, a screen whose diffusion characteristics change with time is considered to be effective. By changing the diffusion characteristics of the screen over time, speckle reduction can be realized by the screen prescription regardless of the type of projector. In addition, it can be said that it is very useful in that speckle can be reduced in combination with a projector which can not adopt the method of Patent Document 1 like a laser scanning type projector.

International Publication 2012/033174

  By the way, such a screen is usually observed as a single color such as black or white in the image non-display state, and there are almost no screens provided with a pattern or a pattern. On the other hand, for example, in surface members such as automobiles, furniture, and housing materials, designability is regarded as very important. At present, in display devices applied to various fields, not only the function of simply displaying an image is expected, but also harmony with the surrounding environment on the design surface is required. The conventional screen visually recognized as black or white in the non-displayed state of an image is inferior in the designability, and such a designability is not fully satisfied with the expected needs.

  The present disclosure has been made in consideration of the above points, and has an object of providing a design capable of reducing speckles to a screen.

The screen of the present disclosure is
A sheet member having a control layer containing a plurality of particles or liquid, an electrode used to apply a voltage to the control layer, and a decorative layer stacked on the control layer;
At least one of movement and rotation of the plurality of particles occurs in the control layer according to the voltage applied to the control layer, or the liquid moves in the control layer according to the voltage. .

  In the screen of the present disclosure, the visible light transmittance of the decorative layer may be 5% or more and 95% or less.

In the screen of the present disclosure, the L ^* a ^* b ^* color system L ^* value of the decorative layer may be 20 or more.

The display device of the present disclosure is
Any of the screens of the present disclosure described above;
And a projector for irradiating the screen with image light.

  In the display device of the present disclosure, the projector may include a light source that emits coherent light.

In the display device of the present disclosure, the lightness and saturation of the image light corresponding to the L ^* value, a ^* value and b ^* value of the L ^* a ^* b ^* color system at each position of the decorative layer The controller may further include a controller that controls the degree and the hue.

  According to the present disclosure, designability can be imparted to a screen capable of reducing speckle.

The figure which shows an example of schematic structure of a display apparatus. The figure explaining a laser scanning method. Sectional drawing which shows the cross-section of a screen. Enlarged view of the particle. The figure which shows an alternating voltage waveform. Sectional drawing of the screen using the particle | grains of a structure different from FIG. Sectional drawing of the screen using the particle | grains of a structure different from FIG. 3 and FIG. Sectional drawing of the screen using the particle | grains of a structure different from FIG.3, FIG.6 and FIG. The figure which shows the example in which both a 1st electrode and a 2nd electrode are formed in stripe form. (A)-(c) is a figure which shows the example in which particle | grains are contained in one or more cavities. The schematic diagram which shows an example of the screen of an electrophoresis system. The schematic diagram which shows the other example of the screen of an electrophoresis system. The figure which shows the example which arranges many micro containers between two electrodes. The figure which shows the example which controls movement of particle | grains for every cell part. The figure which shows a micro cup structure. The figure which shows a powder movement system. FIG. 6 shows an electrowetting method. The figure which shows the other example of schematic structure of a display apparatus. Sectional drawing of the transmissive screen which rotated the particle | grains of FIG. 8 90 degree | times. The figure which shows one modification of schematic structure of a display apparatus. The figure which shows one application example of a screen. The figure which shows the other application example of a screen. The figure which shows the further another application example of a screen.

  Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of easy illustration and understanding, the scale, the dimensional ratio in the vertical and horizontal directions, etc. are appropriately changed from those of the actual one and exaggerated.

  In one embodiment described below, the display device 10 includes a screen 40 and a projector 20 that irradiates the screen 40 with image light. The screen 40 has a sheet member 40x that diffuses the image light, so that an image that can be observed by the observer 1 can be displayed on the screen 40. In the display device 10 or the screen 40 according to the present embodiment, as described below, measures are taken to reduce speckle and to give the screen a design. As a specific configuration, the sheet member 40x is stacked on the control layer 55x including the plurality of particles 60 or the liquid 69x, the electrodes 41 and 42 used to apply a voltage to the control layer 55x, and the control layer 55x. And a decorative layer 45. The plurality of particles 60 or the liquid 69x may include a light diffusing component to diffuse incident image light. In addition, at least one of movement and rotation of the plurality of particles 60 occurs in the control layer 55x according to the voltage applied to the control layer 55x, or the liquid 69x moves in the control layer 55x according to the voltage. Do. As a result, the diffused wavefront of the image light changes with time and speckle can be reduced. In addition, since the applied voltage can be appropriately controlled, it is possible to effectively prevent the image light from being diffused more than necessary to significantly deteriorate the resolution of the image.

  Hereinafter, the present embodiment will be described with reference to some specific examples. First, a specific example of the display device 10 and the screen 40 will be described with reference to FIGS. 1 to 5.

  FIG. 1 is a view showing an example of a schematic configuration of a display device 10. The display device 10 of FIG. 1 further includes a power source 30 and a control device 35 in addition to the projector 20 and the screen 40 to which the image light from the projector 20 is irradiated. The power source 30 applies an alternating voltage to the screen 40. The controller 35 adjusts the applied voltage from the power source 30 to control the state of the screen 40. The control device 35 may also control the operation of the projector 20. Alternatively, the display device 10 may separately include a control device 35 that controls the state of the screen 40 and a control device that controls the operation of the projector 20. As one example, the control device 35 can be configured by a general purpose computer.

  The projector 20 functions as an image light generating device that generates image light. The projector 20 irradiates the screen 40 with the generated image light. In the illustrated example, the projector 20 includes a coherent light source 21 that emits coherent light, and a scanning device (not shown) that adjusts the light path of the coherent light source 21. The coherent light source 21 is typically composed of a laser light source that oscillates a laser beam. The coherent light source 21 may have a plurality of coherent light sources that generate light of different wavelength ranges. The light source may not emit coherent light, but may emit non-coherent light such as LED light.

  In the illustrated example, the projector 20 emits coherent light onto the screen 40 in a laser scanning manner. As shown in FIG. 2, the projector 20 emits coherent light so as to scan the entire area on the screen 40. The scan is performed at high speed. The projector 20 stops the emission of the coherent light from the coherent light source 21 according to the image to be formed. That is, coherent light is irradiated only to the position where the image on the screen 40 is to be formed. As a result, an image is formed on the screen 40. The operation of the projector 20 is controlled by the control device 35.

  Next, the screen 40 will be described. FIG. 3 is a cross sectional view showing a cross sectional structure of the screen. In the illustrated example, the screen 40 is constituted by a sheet member 40x including the control layer 55x and the electrodes 41 and 42. In the illustrated example, the sheet member 40x includes a particle sheet 50 including the control layer 55x. In the illustrated example, the control layer 55 x is formed as a particle layer 55 including a plurality of particles 60. The electrodes 41 and 42 are electrically connected to the power source 30. In the illustrated example, the first electrode 41 spreads in a planar manner on one main surface of the particle layer 55 forming the control layer 55x, and on the other main surface of the particle layer 55 forming the control layer 55x. The second electrode 42 spreads in a plane.

  Further, as shown in FIG. 1, the sheet member 40 x forming the screen 40 has a decorative layer 45 laminated on the control layer 55 x. The decorative layer 45 may be laminated directly in contact with the control layer 55x, or another member is present between the decorative layer 45 and the control layer 55x, and indirectly to the control layer 55x. It may be laminated. Further, as shown in FIG. 1, the sheet member 40 x forming the screen 40 has a first cover layer 46 covering the first electrode 41 and a second cover layer 47 covering the second electrode 42. In the example shown in FIG. 1, the decorative layer 45 forms one outermost surface of the screen 40, and the second cover layer 47 forms the other outermost surface of the screen 40. However, the first cover layer 46 may be provided to cover the decorative layer 45, and the first cover layer 46 may form the outermost surface of the screen 40.

  The screen 40 of FIG. 1 constitutes a reflective screen. The projector 20 irradiates the display side 40 a with image light. The image light passes through the decorative layer 45, the first cover layer 46 and the first electrode 41 of the screen 40, and then diffuses and reflects at the control layer 55x, and the first electrode 41, the first cover layer 46 and the decoration again Permeate layer 45. As a result, the observer 1 positioned facing the display side 40 a of the screen 40 can observe the image. However, as described later, the screen 40 may be formed as a transmissive screen.

  The first electrode 41 and the first cover layer 46 through which the image light passes are transparent. The transmittance of the first electrode 41 and the first cover layer 46 in the visible light region is preferably 80% or more, and more preferably 84% or more. The visible light transmittance is measured at a wavelength of 380 nm to 780 nm using a spectrophotometer (“UV-3100 PC” manufactured by Shimadzu Corporation, a product conforming to JIS K 0115) at each wavelength. It is specified as the average value of transmittance.

  As a conductive material forming the first electrode 41, ITO (Indium Tin Oxide; Indium Tin Oxide), InZnO (Indium Zinc Oxide; Indium Zinc Oxide), Ag nanowires, carbon nanotubes, or the like can be used. On the other hand, the first cover layer 46 is a layer for protecting the first electrode 41 and the particle sheet 50. The first cover layer 46 can be formed of a transparent resin, such as polyethylene terephthalate having excellent stability, polycarbonate or cycloolefin polymer.

  The second electrode 42 can be configured in the same manner as the first electrode 41. Further, the second cover layer 47 can be configured in the same manner as the first cover layer 46. However, the second electrode 42 does not have to be transparent when used in a reflective screen. Therefore, the second electrode 42 can be formed of, for example, a metal such as aluminum or copper. The second electrode 42 made of a metal film can also function as a reflective layer that reflects image light in the reflective screen 40. The second cover layer 47 can be configured in the same manner as the first cover layer 46.

  The decorative layer 45 is a layer for decorating the screen 40 to provide design. The decorative layer 45 is provided closer to the viewer 1 than the particle sheet 50 is. When the image light is not irradiated, the design of the decorative layer 45 is observed by the observer 1. The decorative layer 45 can display information such as figures, patterns, designs, colors, pictures, photographs, characters, marks, letters and numbers. As a design of the decoration layer 45, the woodgrain and marble-like pattern which can be taken in harmony with the surrounding environment in a design surface can be illustrated. Such a decorative layer 45 is formed by printing, for example.

  The decorative layer 45 preferably has a sufficiently high visible light transmittance so as to allow the image light from the light source 21 of the projector 20 to reach the control layer 55x. However, since the decorative layer 45 may transmit the image light from the light source 21 of the projector 20 to the extent that the image can be observed, the higher the luminance of the light source 21 of the projector 20, the lower the transmittance. be able to. For example, when a laser projector of about 300 lumens is used to display an image on a transmission screen having the decorative layer 45 and visibility is visually confirmed, the visible light transmittance of the decorative layer 45 is 5% It was visible above and the image was clearly visible at 10% or more. However, the decorative layer 45 preferably has a visible light transmittance that is not too high, so that the internal structure of the screen 40 is not viewed by the observer 1. Further, in the case of a transmissive screen to be described later, if the transmittance is too high, it causes a reduction in the contrast of the image. Specifically, the visible light transmittance of the decoration layer 45 is preferably 95% or less.

Moreover, it is preferable that the color of the decoration layer 45 is not too deep. Specifically, the brightness of the decorative layer 45, i.e., the value of ^{L *} in ^{the L} * ^a * ^{b *} color system, is preferably 20 or more. If the color of the decorative layer 45 is too dark, image light other than the same color as the color of the decorative layer 45 is absorbed by the decorative layer 45, that is, the image light is colored in the color of the decorative layer 45 The observed image may differ from the originally intended lightness, saturation and hue.

The value of L ^* in the L ^* a ^* b ^* color system can be measured using a colorimeter or a spectrocolorimeter. The value of L ^* of the decorative layer 45 can be measured from the reflected light on the decorative layer 45 using, for example, a spectral color measurement system ("CM-700d" manufactured by Konica Minolta).

  Next, the particle sheet 50 will be described. As shown in FIG. 3, the particle sheet 50 includes a pair of substrates 51 and 52 and a control layer 55 x provided between the pair of substrates 51 and 52. The first base 51 supports the first electrode 41, and the second base 52 supports the second electrode 42. The control layer 55 x is a particle layer 55 including a plurality of particles 60. The particle layer 55 forming the control layer 55 x is sealed between the first base 51 and the second base 52. The first base 51 and the second base 52 can seal the particle layer 55 and have a strength capable of functioning as a support for the electrodes 41 and 42 and the particle layer 55, for example, polyethylene terephthalate resin It may be composed of a film. In the illustrated embodiment, the screen 40 is configured as a reflective screen, and the image light passes through the first base 51. Therefore, it is preferable that the first base 51 be transparent and have the same visible light transmittance as the first electrode 41 and the first cover layer 46.

  Next, the particle layer 55 forming the control layer 55x will be described. As well illustrated in FIG. 3, the particle layer 55 includes a large number of particles 60, a holding unit 56 for holding the particles 60, and a solvent 57 for swelling the holding unit 56. The holding portion 56 holds the particle 60 in an operable manner. In the illustrated example, the holding portion 56 has a large number of cavities 56a, and the particles 60 are accommodated in each of the cavities 56a. The inner dimension of each cavity 56a is larger than the outer dimension of the particle 60 in the cavity 56a. Thus, particle 60 is operable within cavity 56a. In the cavity 56 a, the space between the holding portion 56 and the particle 60 is filled with the solvent 57. According to the holding portion 56 swollen by the solvent 57, the smooth operation of the particle 60 can be stably ensured. Hereinafter, the holding unit 56, the solvent 57, and the particles 60 will be described in order.

  First, the holding unit 56 and the solvent 57 will be described. The solvent 57 is used to facilitate the movement of the particles 60. The solvent 57 is held in the cavity 56 a by the swelling of the holder 56. The solvent 57 is preferably of low polarity so as not to inhibit the particles 60 from operating in response to the electric field. As the low polarity solvent 57, various materials which facilitate the operation of the particles 60 can be used. As an example of the solvent 57, dimethyl silicone oil, an isoparaffinic solvent, and a straight chain alkane such as a linear paraffinic solvent, dodecane or tridecane can be exemplified.

  Next, the holding portion 56 may be configured using, for example, an elastomer sheet made of an elastomer material. The holding portion 56 as an elastomer sheet can swell the solvent 57 described above. As a material of an elastomer sheet, silicone resin, an acrylic resin, a styrene resin, polyolefin resin etc. can be illustrated.

  In the illustrated example, in the holding portion 56, the cavities 56a are distributed with high density in the surface direction of the screen 40. The cavities 56 a are also distributed in the normal direction nd of the screen 40. In the illustrated example, the group of cavities 56 a spread in a plane is arranged in three layers in the thickness direction of the screen 40.

  Next, the particle 60 will be described. The particles 60 have a function of changing the traveling direction of the image light emitted from the projector 20. In the illustrated example, the particles 60 have a function to diffusely reflect the image light. As described later, the screen 40 may be formed as a transmissive type, and in application to a transmissive screen, the particles 60 of the control layer 55x may have a function of simply diffusing image light.

  The particle 60 includes a first portion 61 and a second portion 62 having different relative dielectric constants. Thus, when the particle 60 is placed in an electric field, an electronic dipole moment is generated in the particle 60. At this time, the particle 60 operates to a position where the vector of its dipole moment is directed to the opposite of the vector of the electric field. Therefore, when a voltage is applied between the first electrode 41 and the second electrode 42 and an electric field is generated in the control layer 55 x located between the first electrode 41 and the second electrode 42, the particles 60 It operates in the cavity 56a so as to take a stable attitude, ie a stable position and orientation with respect to the electric field. The screen 40 changes the diffusion wavefront in accordance with the operation of the particle 60 having the light diffusion function.

  The particles 60 including the first portion 61 and the second portion 62 having different relative dielectric constants can be manufactured by various methods including known techniques. For example, spherical particles of an organic substance or inorganic substance are arranged in a single layer using a pressure-sensitive adhesive tape or the like, and a layer of a resin component or an inorganic substance layer different from the spherical particles is charged on the hemispherical surface (vapor deposition method 56-67887), a method using a rotating disk (e.g., Japanese Patent Laid-Open No. 6-226875), and two droplets of different dielectric constants are brought into contact in air using a spray method or an ink jet method, It can manufacture using the method (for example, Unexamined-Japanese-Patent No. 2003-140204) made into a droplet, and the microchannel manufacturing method proposed by JP2004-197083A.

  FIG. 4 is an enlarged view of the particle 60. The particle 60 has a spherical shape, and the first portion 61 and the second portion 62 each have a hemispherical shape. The first portion 61 of the particle 60 has a first main portion 66a and a first diffusion component 66b dispersed in the first main portion 66a. Similarly, the second portion 62 includes a second main portion 67a and a second diffusion component 67b dispersed in the second main portion 67a. Therefore, the spherical particles 60 can exhibit a diffusion function to the light traveling inside the first portion 61 and the light traveling inside the second portion 62. Here, the diffusion components 66 b and 67 b are components that can exert an effect of changing the traveling direction of the light traveling through the inside of the particle 60 by reflection, refraction, or the like. The light diffusing function (light scattering function) of such diffusing components 66b and 67b, for example, constitutes the diffusing components 66b and 67b from a material having a refractive index different from that of the material forming the main parts 66a and 67a of the particle 60. Alternatively, it can be applied by constructing the diffusive component 66b, 67b from a material capable of reflecting light. Resin beads, glass beads, metal compounds, porous materials containing gas, and simple bubbles are exemplified as the diffusion components 66b and 67b having a refractive index different from the material forming the main parts 66a and 67a.

  In addition, the particle layer 55, the particle sheet 50, and the screen 40 which make the control layer 55x can be produced as follows as an example.

  The particle layer 55 can be manufactured by a known manufacturing method. That is, first, an ink in which the particles 60 are dispersed in a polymerizable silicone rubber is prepared. Next, the ink is stretched by a coater or the like, and further polymerized by heating or the like to form a sheet. By the above procedure, the holding portion 56 holding the particle 60 is obtained. Next, the holding portion 56 is immersed in a solvent 57 such as silicone oil for a certain period. The swelling of the holding portion 56 forms a gap filled with the solvent 57 between the holding portion 56 made of silicone rubber and the particles 60. As a result, a cavity 56a containing the solvent 57 and the particles 60 is defined. The particle layer 55 can be manufactured as described above.

  Next, the screen 40 can be manufactured using the particle layer 55 according to the manufacturing method disclosed in JP2011-112792A. First, the particle layer 55 is covered with a pair of substrates 51 and 52, and the particle layer 55 is sealed using a laminate, an adhesive, or the like. Thereby, the particle sheet 50 is produced. Next, the first electrode 41 and the second electrode 42 are provided on the particle sheet 50, and the decorative layer 45, the first cover layer 46, and the second cover layer 47 are further laminated to obtain the screen 40.

  Next, an operation at the time of displaying an image using this display device 10 will be described.

  First, under the control of the control device 35, the coherent light source 21 of the projector 20 oscillates coherent light. The light from the projector 20 is adjusted in its optical path by a scanning device (not shown) and illuminated on the screen 40. As shown in FIG. 2, a scanning device (not shown) adjusts the light path of the light so that the light scans on the display side surface 40 a of the screen 40. However, emission of coherent light by the coherent light source 21 is controlled by the controller 35. The control device 35 stops the emission of the coherent light from the coherent light source 21 in response to the image to be displayed on the screen 40. The operation of the scanning device included in the projector 20 is as fast as it can not be resolved by the human eye. Therefore, the observer 1 simultaneously observes the light irradiated to each position on the screen 40 which is irradiated at a time interval.

  The light irradiated onto the screen 40 passes through the decorative layer 45, the first cover layer 46, and the first electrode 41, and reaches the control layer 55x. The light is diffusely reflected by the particles 60 of the particle layer 55 forming the control layer 55x, and is emitted toward various directions on the side of the viewer 1 of the screen 40. Thereafter, the emitted light passes through the first electrode 41, the first cover layer 46, and the decorative layer 45. Therefore, the reflected light from each position on the screen 40 can be observed at each position on the screen 40 facing the viewer 1. As a result, it is possible to observe an image corresponding to the area irradiated with the coherent light on the screen 40.

  Alternatively, the coherent light source 21 may include a plurality of light sources that emit coherent light in different wavelength ranges. In this case, the control device 35 controls the light source corresponding to the light of each wavelength range independently from the other light sources. As a result, it is possible to display a color image on the screen 40.

The image light may be colored by transmitting through the decorative layer 45. The controller 35 may control the image light emitted from the coherent light source 21 so that the image is observed by the observer 1 with the intended lightness, saturation and hue. That is, the control device 35 corresponds to the value of L ^* , the value of a ^{* and} the value of b ^* of the L ^* a ^* b ^* color system of the decorative layer 45 that transmits the image light in the screen 40. The lightness, saturation and hue of the light may be controlled so that the image light finally colored by the decorative layer 45 has the intended lightness, saturation and hue. In other words, the lightness, saturation and hue of the image light emitted from the coherent light source 21 may be corrected in consideration of the L ^* value, a ^* value and b ^* value in the decorative layer 45.

  When the coherent light source 21 does not oscillate image light, that is, when the image is not displayed on the screen 40, the observer 1 observes the decorative layer 45 provided on the screen 40. Since the decorative layer 45 has excellent design, the screen 40 is given design when the image is not displayed. Or in harmony with the surrounding environment, it is possible to make the observer not aware of the presence of the screen 40.

  By the way, when forming an image on a screen using coherent light, speckles of a speckled pattern come to be observed. One cause of speckle is considered to be that the coherent light represented by the laser light causes an interference pattern on the light sensor surface (on the retina in the case of a human) after being diffused on the screen. In particular, when coherent light is irradiated to the screen by laser scanning, coherent light is incident on each position on the screen from a certain incident direction. Therefore, when the laser scanning method is adopted, the speckle wavefront generated at each point of the screen is immobile as long as the screen does not operate, and the image quality of the displayed image is significantly degraded when the speckle pattern is viewed by the observer together with the image. It will

  On the other hand, the screen 40 of the display device 10 in the present embodiment is configured to change the diffused wavefront over time. If the diffuse wavefront at the screen 40 changes, the speckle pattern on the screen 40 will change with time. Then, if the temporal change of the diffusion wavefront is made fast enough, the speckle pattern is superimposed and averaged, and can be observed by the observer. This makes it possible to make speckles inconspicuous.

  The illustrated screen 40 has a pair of electrodes 41 and 42. The pair of electrodes 41 and 42 are electrically connected to the power source 30. The power source 30 can apply a voltage to the pair of electrodes 41 and 42. When a voltage is applied between the pair of electrodes 41 and 42, an electric field is formed in the control layer 55x located between the pair of electrodes 41 and 42. In the particle layer 55 forming the control layer 55x, particles 60 having a plurality of portions 61 and 62 with different relative dielectric constants are operatively held. The particle 60 operates in accordance with the vector of the electric field formed because it is originally charged, or at least when an electric field is generated in the particle layer 55, a dipole moment is generated. When the particle 60 having a function of changing the traveling direction of light, for example, a reflection function or a diffusion function is operated, the diffusion characteristic of the screen 40 will change with time. As a result, speckle can be made inconspicuous. The code “La” in FIG. 4 is image light emitted from the projector 20 to the screen 40, and the code “Lb” is image light diffused by the screen 40.

  The difference in relative dielectric constant between the first portion 61 and the second portion 62 of the particle 60 is sufficient if the relative dielectric constant is different to such an extent that the speckle reduction function can be exhibited. Therefore, whether the relative dielectric constant is different between the first portion 61 and the second portion 62 of the particle 60 depends on whether the particle 60 which is operatively held can operate along with the change of the electric field vector. It can be determined by

  Here, the principle that the particle 60 operates with respect to the holding unit 56 changes the orientation and position of the particle 60 so that the charge or dipole moment of the particle 60 has a stable positional relationship with the electric field vector. It is said that. Therefore, if a constant electric field continues to be applied to the particle layer 55, the operation of the particles 60 stops after a certain period of time. On the other hand, in order to make the speckles inconspicuous, the operation of the particle 60 with respect to the holding portion 56 needs to be continued. Therefore, the power source 30 applies a voltage so that the electric field formed in the particle layer 55 changes with time. In the illustrated example, the power source 30 applies a voltage between the pair of electrodes 41, 42 so as to invert the vector of the electric field generated in the control layer 55x. For example, in the example shown in FIG. 5, an alternating voltage that repeats the voltage of X [V] and the voltage of -Y [V] is applied from the power source 30 to the pair of electrodes 41 and 42 of the screen 40.

  The particles 60 are accommodated in a cavity 56 a formed in the holding portion 56. The cavity 56a has a substantially spherical inner shape. Therefore, the particle 60 can rotate and vibrate about the rotation axis ra extending in the direction orthogonal to the paper surface of FIG. 4. However, depending on the size of the cavity 56a that contains the particle 60, the particle 60 will perform not only repetitive rotational movement but also translational movement. Furthermore, the solvent 56 is filled in the cavity 56a. The solvent 57 facilitates the operation of the particle 60 with respect to the holder 56.

  The particle 60 is not limited to the structure including the substantially hemispherical first portion 61 and the second portion 62 as shown in FIG. Below, the 1st modification of particle | grains 60-a 3rd modification are demonstrated in order. In these modifications, the control layer 55x is formed by the particle layer 55 in the same manner as the above-described example, while the configuration of the particle 60 held by the holding portion 56 of the control layer 55x is different from the above-described example .

(First Modified Example of Particle 60)
FIG. 6 is a cross-sectional view of a screen 40 using particles 60 of a structure different from that of FIG. Similar to the above-described example, the screen 40 is configured by the sheet member 40x including the control layer 55x and the electrodes 41 and 42, and the control layer 55x is formed as the particle layer 55 including the plurality of particles 60. There is. A particle 60 according to a first modification shown in FIG. 6 has a first portion 61 and a second portion 62 having mutually different volumes. FIG. 6 shows an example in which the volume of the first portion 61 is larger than the volume of the second portion 62. In the case of FIG. 6, the second portion 62 is shaped like a sphere or an elliptical sphere, and the surface of the second portion 62, ie, the interface with the first portion 61, is convex. The particles 60 are not necessarily limited to an ideal sphere, and the second portion 62 may also be slightly distorted from the ideal sphere or ellipsoid.

  The first portion 61 is a transparent member. A specific material of the first portion 61 is, for example, silicone oil or a transparent resin member. The first portion 61 is ideally disposed on the viewer 1 side as shown in FIG. The light incident on the first portion 61 passes through the first portion 61 and reaches the second portion 62 as it is. The second portion 62 has a relative dielectric constant different from that of the first portion 61, and has a light reflection function. Furthermore, the second portion 62 is configured to have a refractive index lower than that of the first portion 61. In addition, the second component 62 may include a diffusion component 62 c for diffusing light. The diffusion component 62c acts on the light traveling in the particle 60 to change the direction of the light by reflection, refraction, or the like. Each of these components may be configured identical to the diffusion component described with reference to FIG.

  In addition, the surface of the second portion 62 is convex. Therefore, when there is a difference in refractive index at the interface between the first portion 61 and the second portion 62, the light reaching the second portion 62 from the first portion 61 has a direction according to the convex shape of the surface of the second portion 62 It is reflected by From the above, the irradiation light from the projector 20 is reflected by the second portion 62, and the image is observed on the screen 40.

  In the state of FIG. 6, when a voltage is applied between the first and second electrodes 41 and 42, an electric field is generated between the first and second electrodes 41 and 42, and this electric field causes an electron dipole in the particle 60. A child moment occurs. At this time, the particle 60 operates to a position where the vector of its dipole moment is directed to the opposite of the vector of the electric field. By changing the voltage between the first electrode 41 and the second electrode 42, the attitude of the particle 60 is changed, whereby the surface direction of the second portion 62 with respect to the surface direction of the particle layer 55 is changed. Since the second portion 62 has a function of reflecting the light incident on the first portion 61, the change in the surface direction of the second portion 62 also changes the reflection characteristic of the light emitted from the second portion 62. . Thereby, speckle can be reduced also in the case of using the control layer 55x including the particles 60 shown in FIG.

(Second Modified Example of Particle 60)
FIG. 7 is a cross-sectional view of a screen 40 using particles 60 of a different structure than those of FIGS. As in the embodiment and the first modification described above, the screen 40 is constituted by the sheet member 40 x including the control layer 55 x and the electrodes 41 and 42, and the control layer 55 x is a particle including a plurality of particles 60. It is formed as a layer 55. A particle 60 according to the second modification shown in FIG. 7 has a first portion 61 and a second portion 62 whose volume is larger than that of the first portion 61. The material of the first portion 61 and the second portion 62 is the same as in the first modified example of the particle 60, the first portion 61 is a transparent member, and the second portion 62 has a light reflecting function. Also, the particles 60 are not necessarily limited to an ideal sphere, and the first portion 61 may also be slightly distorted from the ideal sphere or ellipsoid.

  Also in the example shown in FIG. 7, when a voltage is applied between the electrodes 41 and 42 and an electric field is formed in the particle layer 55 forming the control layer 55x, a dipole moment is generated in the particle 60 and the dipole moment is generated. The vector of x moves toward a position that is opposite to the vector of the electric field. By changing the voltage between the first electrode 41 and the second electrode 42, the particle 60 is rotated. The rotation of the particles 60 changes the diffusion characteristics of the light emitted from the second portion 62 of the particles 60. Thereby, speckle can be reduced also when using the control layer 55x including the particle 60 shown in FIG.

(Third Modified Example of Particle 60)
FIG. 8 is a cross-sectional view of a screen 40 using particles 60 of a different structure than that of FIGS. 3, 6 and 7. As in the embodiment, the first modification, and the second modification described above, the screen 40 is configured by the sheet member 40x including the control layer 55x and the electrodes 41 and 42, and the control layer 55x includes a plurality of particles. 60 is formed as a particle layer 55 containing 60. A particle 60 according to a third modification shown in FIG. 8 has a three-layer structure in which a first portion 61, a third portion 63 and a second portion 62 are arranged in this order, and the first portion 61 is disposed on the viewer side There is. The third portion 63 is in surface contact with the first portion 61 and controls incident light from the first portion 61. The second portion 62 is in surface contact with the second surface 63 b opposite to the first surface 63 a that is in surface contact with the first portion 61 of the third portion 63. The second portion 62 has a dielectric constant different from that of the first portion 61. Thus, the third portion 63 is sandwiched by the first portion 61 and the second portion 62, and the third portion 63 is in surface contact with the first portion 61 and the second portion 62.

  The first portion 61 and the second portion 62 are transparent members. The third portion 63 has a function of reflecting the light incident on the first portion 61. The third portion 63 is configured with a refractive index different from that of the first portion 61. In addition, the third component 63 may include a diffusion component 63c for diffusing light. The diffusion component 63c acts on the light traveling in the particle 60 to change the traveling direction of the light by reflection or the like. Such a light diffusion function (light scattering function) of the diffusion component 63c can be provided by the same configuration as the diffusion components 66b and 67b in the example shown in FIG. Although the shape of the particle 60 is typically spherical, it is not limited to an ideal sphere, and the shapes of the first portion 61, the third portion 63 and the second portion 62 are also the shape of the particle 60. It changes according to.

  Also in the example shown in FIG. 8, when a voltage is applied between the electrodes 41 and 42 and an electric field is formed in the particle layer 55 forming the control layer 55 x, a dipole moment is generated in the particle 60 and the dipole moment is generated. The vector of x moves toward a position that is opposite to the vector of the electric field. By changing the voltage between the first electrode 41 and the second electrode 42, the particle 60 is rotated. The rotation of the particles 60 changes the diffusion characteristics of the light emitted from the second portion 62 of the particles 60. Thereby, speckle can be reduced also in the case of using the control layer 55x including the particle 60 shown in FIG.

(Modification of electrodes 41 and 42)
In the screens of the first and second modified examples described above, an example is shown in which the first electrode 41 and the second electrode 42 are formed in a planar shape and disposed so as to sandwich the control layer 55x. It is not limited.

  In each screen mentioned above, although the 1st electrode 41 and the 2nd electrode 42 were formed in the shape of a field, and the example arranged so that the particle layer 55 may be pinched | interposed was shown, it is not restricted to this example. One or more of the first electrode 41 and the second electrode 42 may be formed in a stripe shape. For example, in the example of FIG. 9, both the 1st electrode 41 and the 2nd electrode 42 are formed in stripe form. That is, the first electrode 41 has a plurality of linear electrode portions 41 a extending linearly, and the plurality of linear electrode portions 41 a are arranged in a direction orthogonal to the longitudinal direction. Similarly to the first electrode 41, the second electrode 42 also has a plurality of linearly extending linear electrode portions 42a, and the plurality of linear electrode portions 42a are arranged in a direction orthogonal to the longitudinal direction thereof . In the example shown in FIG. 9, both the plurality of linear electrode portions 41 a forming the first electrode 41 and the plurality of linear electrode portions 42 a forming the second electrode 42 are opposite to the viewer of the control layer 55 x Are placed on the face of the The plurality of linear electrode portions 41 a forming the first electrode 41 and the plurality of linear electrode portions 42 a forming the second electrode 42 are alternately arranged along the same arrangement direction. Also by the first electrode 41 and the second electrode 42 shown in FIG. 9, an electric field can be formed in the control layer 55x by applying a voltage from the power source 30.

(Modification of holding portion 56)
As another modification, as shown in FIG. 10A to FIG. 10C, the cavity 56a of each holding portion 56 in the particle layer 55 forming the control layer 55x is shown in FIG. Thus, the single particle 60 may be disposed to be spaced apart from the other cavity 56a, or, as shown in FIGS. 10 (b) and 10 (c), a plurality of cavities may be provided. May be connected. FIG. 10 (b) shows the holding part 56 including single particles 60-1 and 60-2 in the two connected cavities 56a1 and 56a2. The movable range of the particles 60-1 and 60-2 is restricted by the corresponding cavities 56a1 and 56a2. FIG. 10 (c) shows a holding portion 56 including single particles 60-1, 60-2, 60-3 in the three cavities 56a1, 56a2, 56a3 connected. The movable range of the particles 60-1, 60-2, 60-3 is restricted by the corresponding cavities 56a1, 56a2, 56a3.
As described above, even if a plurality of cavities are connected, if the movable ranges of the plurality of particles are arranged without overlapping, the cavity included in the holding portion 56 is configured to include a single particle. It can be considered that

  Also, the inner diameter of the cavity is not limited as long as it is larger than the outer diameter of the contained particles. For example, the inner diameter of the cavity may be set to at least 1.1 times and not more than 1.3 times the outer diameter of the particles to be contained.

(Another example of control layer 55x)
Further, each screen 40 described above is operated by operating the particles 60 in the particle layer 55 forming the control layer 55 x in the cavity provided corresponding to the particles 60 in accordance with the AC voltage applied to the electrode. It is designed to prevent visual Alternatively, speckle may not be viewed by moving the particles 60 in the particle layer 55 in response to the alternating voltage applied to the electrodes. Also in the following modification, the screen 40 is configured by the sheet member 40x including the control layer 55x and the electrodes 41 and 42. Control layer 55x includes a plurality of particles 60 or liquid 69x.

  11A and 11B are schematic views showing an example of the screen 40 of the electrophoresis system. The screen 40 of FIG. 11A is a structure having a control layer 55x in which two kinds of particles 60 migrating in the solvent are sealed between two opposing electrodes 41 and 42. The two types of particles 60 have different polarities. An alternating voltage is applied between the two electrodes 41 and 42. Application of an alternating voltage moves one particle 60 in the direction of one electrode and the other particle 60 moves in the direction of the other electrode. When the polarity of the AC voltage applied between the two electrodes 41 and 42 is reversed, the two types of particles 60 move to the electrodes in opposite directions. The movement of the particles 60 changes the diffusion characteristics of the light diffused by the control layer 55x. This can reduce speckle.

  Instead of providing two types of particles 60 having different polarities as shown in FIG. 11A, a control layer 55x may be provided which includes particles 60 made of a dipole as shown in FIG. 11B. In this case, each particle 60 vibrates each time the voltage polarity of the AC voltage applied between the two electrodes 41 and 42 changes. As a result, the reflection characteristics of the control layer 55x in the screen 40 also change, and speckles become less noticeable.

  In FIGS. 11A and 11B, the particle 60 is freely moved between the two electrodes 41 and 42. However, when the area of the electrode is large, some particles 60 remain at one place. There is a fear. Therefore, the electrode may be a pattern electrode divided into small units.

  11A and 11B allow the plurality of particles 60 to move freely between the two electrodes 41 and 42. However, as shown in FIG. 11C, a capsule etc. that accommodates two types of particles 60 having different polarities. The micro container 64 may be disposed between the two electrodes 41 and 42 by providing the control layer 55 x including the micro container 64. Further, by setting one of the electrodes as a pattern electrode, the direction of the particles 60 in the micro container 64 can be changed for each electrode. Thereby, the diffusion characteristics of the particles 60 are changed, and speckle can be reduced.

  As a modification of FIG. 11A, FIG. 11B and FIG. 11C, as shown in FIG. 12A and FIG. 12B, a plurality of cell portions 53 are provided in the control layer 55x along the sheet surface of the screen 40. The movement of the particles 60 may be controlled for each cell unit 53 by providing the electrodes 41. In the partition structure as shown in FIG. 12A, each cell portion 53 is formed by the two base members 51 and 52 opposed to each other and the partition portion 54. Such a structure can be relatively easily formed using photolithography and transfer techniques. The particles 60 may be accommodated in each cell portion 53, or a micro container 64 in which a plurality of particles 60 are accommodated as shown in FIG. 11C may be accommodated.

  In the partition structure of FIG. 12B, asperities are formed in the insulating layer 58 disposed on one of the electrodes 42 by a forming process or the like, the particles 60 and the solvent 57 are filled in the recess 59, and the substrate is provided thereon It seals by 51 and produces a micro cup array. For example, by arranging the electrode 41 for each microcup, the movement of the particles 60 inside can be controlled for each microcup.

  Further, the screen 40 according to the present embodiment moves powder in which the plurality of particles 60 are moved in gas instead of adopting the control layer 55 x of electrophoresis type in which the plurality of particles 60 are moved in the liquid medium. The control layer 55x of the system may be adopted. For example, as shown in FIG. 13, the cells 77 of the partition structure of the control layer 55 x may be filled with the gas 77 and a plurality of powder particles 70. Here, the granular material 70 is a substance which exhibits fluidity by itself without using the power of gas or the power of liquid. That is, the granular material 70 is an intermediate state having both the characteristics of the particle and the liquid, and is a substance in a unique state which is less susceptible to gravity and exhibits high fluidity. Also in the case of FIG. 13, for example, by providing an electrode for each cell unit 53, the moving direction of the plurality of particles 60 can be varied for each cell, and the speckle becomes inconspicuous.

  Further, as shown in FIG. 14, the screen 40 may employ an electrowetting control layer 55x. That is, the control layer 55x may contain the liquid 69x instead of the particles 60. In the case of FIG. 14, the water 68 and the oil droplet 69 are filled as the liquid 69 x in each cell portion 53 of the partition structure of the control layer 55 x, and the oil droplet 69 is disposed on the dielectric layer 80. The oil droplet 69 moves inside the control layer 55x in accordance with the applied voltage of the electrodes 41 and 42 corresponding to each cell portion 53, and the contact angle of the oil droplet 69 with respect to the dielectric layer 80 changes. The surface area can be varied. As a result, the reflection characteristics of the screen 40 change, and speckles are less likely to be viewed.

  Although each screen 40 described above is premised on using coherent light as the light source 21, it has the advantage that speckle is not noticeable on the screen 40 even if the light source 21 does not take measures against speckle. For this reason, it is assumed that each screen 40 mentioned above is used for various uses.

  If the desired size of the screen 40 is larger than the size of the sheet member 40x for the screen 40, a plurality of sheet members 40x may be connected to produce the screen 40 of any size.

  As described above, the screen 40 according to the present embodiment includes the control layer 55x including the plurality of particles 60 or the liquid, and the electrodes 41 and 42 that apply a voltage to the control layer 55x to drive the plurality of particles 60 or the liquid 69x. And the decorative layer 45 stacked on the control layer 55x, and at least the movement and rotation of the plurality of particles 60 in the control layer 55x in response to the voltage applied to the control layer 55x. One occurs or the liquid 69x moves inside the control layer 55x according to the voltage. According to such a screen 40, when a voltage is applied to the electrodes 41 and 42, the plurality of particles 60 or liquid is driven, and the diffusion characteristics of the screen 40 change with time. Therefore, speckle can be reduced by applying a voltage to the electrodes 41 and 42 while the screen 40 is irradiated with the image light. On the other hand, while the image light is not irradiated, the design of the decorative layer 45 is observed. That is, the design can be provided to the screen 40 capable of reducing speckles.

  Specifically, for example, when Safmare (product of Dainippon Printing Co., Ltd., product number: WS-5099E) is laminated on the control layer 55x as the decorative layer 45, speckles are displayed while the screen 40 is irradiated with image light. It was confirmed that the design of the decorative layer 45 can be observed while it can be reduced and the image light is not irradiated.

  Moreover, in the screen 40 of the present embodiment, the visible light transmittance of the decorative layer 45 is 5% or more and 95% or less. According to such a screen 40, image light from the light source 21 of the projector 20 can be transmitted, and the internal structure of the screen 40 is not viewed by the observer 1. Therefore, image light is not inhibited by the decorative layer 45, and the design of the decorative layer 45 is less likely to be impaired if the internal structure of the screen 40 is viewed.

Furthermore, in the screen 40 of the present embodiment, the L ^* value of the L ^* a ^* b ^* color system of the decorative layer 45 is 20 or more. According to such a screen 40, the image light is less likely to be colored by the decorative layer 45, and thus the observed image is likely to be observed with the originally intended lightness, saturation and hue.

  Note that various modifications can be made to the embodiment described above. Hereinafter, an example of a modification will be described with reference to the drawings. In the following description and the drawings used in the following description, with respect to parts that can be configured in the same manner as the above-described embodiment, the same reference numerals as those used for corresponding parts in the above-described embodiment are used. The explanation is omitted.

  In the embodiment described above, an example in which the screen 40 is configured as a reflective screen has been described, but the present invention is not limited to this example, and as illustrated in FIG. Good. In this case, the light source 21 of the projector 20 emits image light from the opposite side of the display side surface 40 a. Also, each of the particles 60 contained in the particle layer 55 has a transmittance of light within the wavelength band of coherent light emitted from the coherent light source 21 higher than that of light outside the wavelength band of coherent light. It may be configured. As a result, transmission of light of a wavelength outside the wavelength band of coherent light among wavelengths included in ambient light such as external light and illumination light is suppressed, and the opposite side to the display side surface 40 a of the screen 40 The observer 1 positioned facing to the face of [1] can observe a high contrast image even in a bright environment. In the transmissive screen 40, the second electrode 42, the second cover layer 47, and the second base 52 are configured to be transparent similarly to the first electrode 41, the first cover layer 46, and the first base 51, and It is preferable to have the same visible light transmittance as the first electrode 41, the first cover layer 46, and the first base material 51. In addition, it is preferable that the amount of the diffusion components 66 b and 67 b added in the particle 60 be adjusted so that the transmittance of light incident on the particle 60 is higher than the reflectance of light incident on the particle 60 .

  By making the screen 40 a transmissive screen, the projector 20 that oscillates laser light is disposed on the opposite side of the display side surface 40 a of the screen 40. The observer observes the laser light emitted from the projector 20 only through the screen 40. Therefore, there is no possibility that the observer directly views the laser light oscillated from the projector 20, and the safety can be enhanced.

  In FIG. 15, a light absorbing layer such as a diffusion layer or a colored layer may be provided by being laminated on the decorative layer 45. The diffusion layer may contain particles that transmit and diffuse light. The colored layer is a translucent or colored dyed layer to lower the transmittance and improve the contrast. These layers may be provided as appropriate depending on the function to be applied to the screen 40.

  Furthermore, when the screen 40 is of a transmission type, the screen 40 may further include a Fresnel lens layer 48 as shown in FIG. 17 on the side of the particle sheet 50 opposite to the side on which the decorative layer 45 is laminated. . The Fresnel lens layer 48 has a function of refracting the traveling direction of the image light from the coherent light source 21 in the direction parallel to the vertical direction nd of the screen 40. The Fresnel lens layer 48 has a base 48 a and a Fresnel lens portion 48 b formed on the surface of the base 48 a. The base 48 a is light transmissive, but may have light diffusive inside. The Fresnel lens portion 48 b has a Fresnel shape in which a plurality of lenses 48 c are arranged concentrically.

  By causing the image light to be incident in parallel in the vertical direction nd of the screen 40 by the Fresnel lens layer 48, the utilization efficiency of the image light is improved, and the in-plane variation of the brightness of the image observed by the observer 1 is reduced. be able to. Furthermore, even if the distance between the coherent light source 21 and the screen 40 is so short that the image light is greatly inclined and incident, the image light can be incident in parallel to the screen 40, so the coherent light source 21 and the screen 40 To make the display device 10 thinner.

  Although not shown, in place of the Fresnel lens layer 48, a prism layer may be provided to deflect the direction of the incident image light. Also by the prism layer, the incident angle to the screen 40 can be reduced, and further, the image light can be incident parallel to the vertical direction nd of the screen 40. As a result, the utilization efficiency of the image light can be improved, and the in-plane variation of the brightness of the image observed by the observer 1 can be reduced. In addition, since the prism shape for forming the prism layer is easy to design, it is possible to increase the degree of freedom in the arrangement of the coherent light source 21 and the screen 40.

  When the screen 40 is of a transmission type, the screen 40 may further include a lenticular lens layer 49 on the side of the particle sheet 50 opposite to the side on which the decorative layer 45 is laminated, as shown in FIG. Good. The lenticular lens layer 49 has a base 49 a and a lenticular lens portion 49 b formed on the surface of the base 49 a. The lenticular lens layer 49 has a function of diffusing image light incident from the base 49 a side in the arrangement direction of the lenticular lens portions 49 b and emitting the light. The base 49a has light transparency, but may have light diffusivity inside. The lenticular lens portion 49 b is formed by extending a plurality of convex lenses 49 c in one direction.

  By diffusing the image light in a certain direction by the lenticular lens layer 49, the image light can be observed from a wider angle in that direction.

  The display device 10 including the screen 40 described above may be used by being incorporated into, for example, furniture or an electrical appliance. In FIGS. 18 to 20, as an example using a transmissive screen, an example in which an image from a projector appears on wood-grain furniture, a product display shelf, or a dashboard of a car is illustrated. Application is not limited to these examples.

  The aspects of the present invention are not limited to the above-described individual embodiments, but include various modifications that those skilled in the art can conceive, and the effects of the present disclosure are not limited to the contents described above. That is, various additions, modifications and partial deletions are possible without departing from the conceptual idea and spirit of the present disclosure derived from the contents defined in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 display device 20 projector 21 light source 30 power source 35 control device 40 screen 40 x sheet member 40 a display side surface 41 first electrode 42 second electrode 45 decorative layer 46 first cover layer 47 second cover layer 48 Fresnel lens layer 49 lenticular lens Layer 50 particle sheet 51 first base material 52 second base material 55 particle layer 55x control layer 56 holding portion 56a cavity 57 solvent 60 particle 61 first portion 62 second portion 66a first main portion 66b first diffusion component 67a second Main part 67b Second diffusion component 69 Oil droplet 69x Liquid ra Rotational axis

Claims (8)

A sheet member having a control layer containing a plurality of particles or liquid, an electrode used to apply a voltage to the control layer, and a decorative layer stacked on the control layer;
At least one of movement and rotation of the plurality of particles occurs in the control layer according to the voltage applied to the control layer, or the liquid moves in the control layer according to the voltage. Do the screen.   The screen according to claim 1, wherein the visible light transmittance of the decorative layer is 5% or more and 95% or less. The screen according to claim 1 or 2, wherein the L ^* value of the L ^* a ^* b ^* color system of the decorative layer is 20 or more. The control layer comprises a plurality of the particles,
The screen according to any one of claims 1 to 3, wherein the plurality of particles each include first and second portions having different relative dielectric constants. The control layer comprises a plurality of the particles,
The screen according to any one of claims 1 to 3, wherein the plurality of particles are composed of two types of particles different in polarity from each other. A screen according to any one of claims 1 to 5;
A projector configured to emit image light onto the screen.   The display device according to claim 6, wherein the projector has a light source that emits coherent light. Control to control the lightness, saturation and hue of the image light corresponding to the L ^* value, a ^* value and b ^* value of the L ^* a ^* b ^* color system at each position of the decorative layer The display device according to claim 6, further comprising a device.

Images