JP4442143B2 - Projection type image display system - Google Patents

Description

This invention relates to projection morphism type image display system for projecting an image on the screen.

  The liquid crystal projector is one of the most popular projectors among various projectors. This is because the liquid crystal projector is advantageous in that it is small and lightweight, is easy to set, and is inexpensive.

  In recent years, as a light source of the liquid crystal projector, an ultrahigh pressure mercury lamp (a mercury lamp in a broad sense) using a light emission spectrum of mercury by discharge has been widely used. This is because the ultra-high pressure mercury lamp has excellent characteristics in terms of luminous efficiency, lifetime, power consumption, and the like.

  Here, the characteristics of the ultra-high pressure mercury lamp will be described with reference to FIG. FIG. 14A shows the spectral distribution at a mercury vapor pressure of 3 MPa. FIG. 14B shows the spectral distribution at a mercury vapor pressure of 15 MPa. FIG. 14C shows the spectral distribution at a mercury vapor pressure of 22 MPa. As shown in FIG. 14A, the emission line spectrum is dominant at a low pressure. However, as shown in FIG. 14B, the emission line width increases as the pressure is increased, and the entire spectrum becomes gentle and continuous light emission increases. Then, as shown in FIG. 14C, when the pressure reaches about 22 MPa, it is possible to obtain red light emission that can be used as a light source for a projector. As described above, in the ultra-high pressure mercury lamp, the mercury vapor pressure is set to an ultra-high pressure, thereby raising the base of the whole spectrum and creating a red component. Hereinafter, as shown in FIG. 14C, a mercury lamp that generates a red component by raising the base of the entire spectrum by setting the mercury vapor pressure to an ultrahigh pressure is referred to as an ultrahigh pressure mercury lamp. As shown in FIG. 14A, a mercury lamp that does not have a red component is referred to as a high-pressure mercury lamp.

  FIG. 15 shows a configuration of a conventional liquid crystal projector using an ultrahigh pressure mercury lamp as a light source. As shown in FIG. 15, this liquid crystal projector includes a light source 101, a microlens array 102, a mirror 103, a microlens array 104, a PS converter 105, a condenser lens 106, a dichroic mirror 107, a condenser lens 108, a mirror 109, and a condenser lens 113. , Dichroic mirror 114, relay lens 115, mirror 116, relay lens 117, mirror 118, condenser lenses 110B, 110G, 110R, polarizing plates 111B, 111G, 111R, liquid crystal panels 112B, 112G, 112R, polarizing plates 130B, 130G, 130R , A cross beam combiner prism 119 and a projection lens 120.

  FIG. 16 shows spectral characteristics of an ultrahigh pressure mercury lamp used as the light source 101. FIG. 17A shows the spectral characteristics of the blue light separated by the dichroic mirror 107. FIG. 17B shows the spectral characteristics of green light separated by the dichroic mirror 114. FIG. 17C shows the spectral characteristics of red light separated by the dichroic mirror 114.

  The light source 101 is an ultra high pressure mercury lamp, and emits white light having spectral characteristics shown in FIG. White light emitted from the light source 101 passes through the microlens array 102, is reflected by the mirror 103, and is guided to the microlens array 104. The white light guided to the microlens array 104 is transmitted through the microlens array 104, converted into a polarized wave (for example, P-polarized wave) having a predetermined polarization direction by the PS converter 105, and dichroic mirror through the condenser lens 106. Guided to 107.

  Of the white light guided to the dichroic mirror 107, only the light having the blue color component (see FIG. 17A) is reflected by the dichroic mirror 107 and guided to the mirror 109 via the condenser lens. The blue light guided to the mirror 109 is reflected by the mirror 109 and guided to the cross beam combiner prism 119 via the condenser lens 110B, the polarizing plate 111B, the liquid crystal panel 112B, and the polarizing plate 130B. On the other hand, light having green and red color components passes through the dichroic mirror 107 and enters the dichroic mirror 114 via the condenser lens 113.

  Of the light incident on the dichroic mirror 114, only light having a green color component (see FIG. 17B) is reflected by the dichroic mirror 114 and passes through the condenser lens 110G, the polarizing plate 111G, the liquid crystal panel 112G, and the polarizing plate 130G. It is guided to the cross beam combiner prism 119. On the other hand, light having a red color component (see FIG. 17C) passes through the dichroic mirror 114 and enters the mirror 116 via the relay lens 115.

  The red light incident on the mirror 116 is reflected by the mirror 116 and guided to the mirror 118 via the relay lens 117. The light guided to the mirror 118 is reflected by the mirror 118 and guided to the cross beam combiner prism 119 via the condenser lens 110R, the polarizing plate 111R, the liquid crystal panel 112R, and the polarizing plate 130R.

  The light of each color guided to the cross beam combiner prism 119 is synthesized by the cross beam combiner prism 119 and projected onto a screen (not shown) via the projection lens 120.

  By the way, in the conventional projection system, when ambient light not related to image display is incident on the screen, there is a problem that the contrast of the display image is deteriorated and the visibility of the image is deteriorated. This is because the screen reflects the ambient light as well as the light projected from the projector. Therefore, the present applicant has proposed a projection system comprising a liquid crystal projector and a screen that selectively reflects only light emitted from the liquid crystal projector.

  However, according to the knowledge of the present inventor, this projection system has a problem that the effect of wavelength selectivity cannot be sufficiently exhibited for red light. That is, there are problems that the contrast of the display image cannot be increased so much and the red color reproduction range cannot be expanded so much. This is due to the following reason.

  That is, in the ultra-high pressure mercury lamp, as shown in FIG. 14, the red color component lacking in the high-pressure mercury lamp is removed by raising the base of the entire spectrum by setting the mercury vapor pressure to an ultra-high pressure (200 atmospheres or more). It is forcibly created. For this reason, in the ultra-high pressure mercury lamp, as shown in FIG. 16 and FIG. 17C, the red wavelength band is wide and the amount of emitted red light is insufficient. Therefore, the conventional projection system using the ultra-high pressure mercury lamp having such characteristics as the main light source cannot sufficiently exhibit the wavelength selectivity effect.

  As a method for solving this problem, it is conceivable to provide a solid light source that individually emits red light, green light, and blue light in place of the ultra-high pressure mercury lamp (see, for example, Patent Document 1). And as this solid light source, a semiconductor laser and a light emitting diode are mentioned.

JP 2001-281760 A

  However, a solid light source that emits light in the blue and green wavelength bands has a problem that it is difficult to realize a solid light source with high output and high versatility.

Therefore, an object of the present invention is to improve the effect of wavelength selectivity in a projection type image display system comprising a screen having wavelength selectivity and a projection type image display device that projects an image onto the screen. An object of the present invention is to provide a projection type image display system that can be used.

The first invention is
In a projection-type image display system comprising a screen and a projection-type image display device that projects an image on the screen,
Screen
A light absorbing layer that absorbs at least light in the visible light region;
An optical multilayer film provided on the light absorption layer and selectively reflecting blue, green and red light,
Projection type image display device
A first light source that emits light having blue and green color components among the three primary colors;
A second light source that emits red light;
A combining means for combining the light emitted from the first light source and the light emitted from the second light source ;
The first light source is a mercury lamp having a mercury vapor pressure of 100 atm or less;
The second light source is a light source that emits red light having a narrow wavelength band;
The wavelength band corresponding to the blue and green color components emitted from the first light source and the wavelength band of the red light emitted from the second light source are selected according to the reflection wavelength characteristics of the screen. which is a projection type image display system comprising.

The second invention is
In a projection-type image display system comprising a screen and a projection-type image display device that projects an image on the screen,
Screen
A light absorbing layer that absorbs at least light in the visible light region;
An optical multilayer film provided on the light absorption layer and selectively reflecting blue, green and red light,
Projection type image display device
A first light source that emits light having blue and green color components among the three primary colors;
A second light source that emits red light;
Separating means for separating light emitted from the first light source into blue light and green light;
Modulation means for modulating blue light and green light separated by the separation means and red light emitted from the second light source;
And combining means for combining blue light, green light and red light modulated by the modulating means ,
The first light source is a mercury lamp having a mercury vapor pressure of 100 atm or less;
The second light source is a light source that emits red light having a narrow wavelength band;
The wavelength band corresponding to the blue and green color components emitted from the first light source and the wavelength band of the red light emitted from the second light source are selected according to the reflection wavelength characteristics of the screen. which is a projection type image display system comprising.

  The separating means is typically a dichroic mirror. The modulation means is typically a liquid crystal panel. The combining means is typically a cross beam combiner prism.

  According to this invention, the first light source emits light having blue and green color components of the three primary colors, the second light source emits red light, and the combining means emits light emitted from the first light source. And the light emitted from the second light source, the red color component lacking in the light emitted from the first light source can be supplemented by the red light emitted from the second light source. it can.

According to the present invention, the red light that is not included in the light emitted from the first light source and the red light that is emitted from the second light source can be supplemented. The effect that it can improve can be acquired.

According to the present invention, it is possible to irradiate the screen with red light having a narrow wavelength band, thereby obtaining an effect that the wavelength selectivity effect on the screen can be further improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings of the following embodiments, the same or corresponding parts are denoted by the same reference numerals.

  FIG. 1 shows an example of the configuration of a projection type image display system (projection system) according to an embodiment of the present invention. As shown in FIG. 1, the projection type image display system includes a screen 1 having wavelength selectivity, a projection type image display device 2 that emits light according to the wavelength selectivity of the screen 1, and an ambient light generator 3. Consists of.

  Here, with reference to FIG. 2A-2D, the outline | summary of the projection type image display system by this one Embodiment is demonstrated. FIG. 2A schematically shows human visual characteristics (visual wavelength characteristics). FIG. 2B schematically shows the reproduction wavelength characteristics of the projection-type image display device 2. FIG. 2C schematically shows the reflection wavelength characteristic of the screen 1. FIG. 2D schematically shows the wavelength characteristics of the ambient light emitted from the ambient light generator 3.

  As shown in FIG. 2B, the projection type image display device 2 irradiates the screen 1 with only the three primary color lights of blue (B), green (G), and red (R). The ambient light generator 3 emits light other than blue, green, and red, as shown in FIG. 2D. As shown in FIG. 2C, the screen 1 reflects only the three primary colors of blue, green, and red out of the light incident on the screen 1 and absorbs other light. Thereby, in the projection type image display system according to this embodiment, an image display with high contrast can be performed even in a bright environment. In addition to the ambient light generator 3, sunlight and incandescent lamps can be considered as the ambient light. However, since it is not easy to filter these lights, the screen 1 prevents these lights from entering. It is preferable to install.

  FIG. 3 shows an example of the configuration of the screen 1 according to the embodiment of the present invention. FIG. 4 shows an example of the reflection wavelength characteristic of the screen 1 according to the embodiment of the present invention. FIG. 5 shows an example of wavelength characteristics of a fluorescent lamp. As shown in FIGS. 4 and 5, the screen 1 according to this embodiment is characterized in that it absorbs the light emitted from the ambient light generator 3 such as a fluorescent lamp with little reflection.

  As shown in FIG. 3, in the screen 1 according to the embodiment, an optical multilayer film 12a and a light diffusion layer 14 are sequentially stacked on one main surface of a substrate 11, and an optical surface is formed on the other main surface of the substrate 11. The multilayer film 12b and the light absorption layer 13 are sequentially stacked.

Hereinafter, the configuration of the screen 1 will be described with reference to FIG.
(substrate)
The board | substrate 11 should just satisfy desired optical characteristics, such as a transparent film, a glass plate, an acrylic board, a methacryl styrene board, a polycarbonate board, a lens. As optical characteristics, the material constituting the substrate 11 preferably has a refractive index of 1.3 to 1.7, a haze of 8% or less, and a transmittance of 80% or more. Further, the substrate 11 may have an antiglare function.

  The transparent film is preferably a plastic film, and examples of the material forming the film include cellulose derivatives (eg, diacetylcellulose, triacetylcellulose (TAC), propionylcellulose, butyrylcellulose, acetylpropionylcellulose and nitrocellulose), polymethyl (Meth) acrylic resins such as methacrylates and copolymers of vinyl methacrylates such as methyl methacrylate and other alkyl (meth) acrylates, styrene, etc .; polycarbonate resins such as polycarbonate and diethylene glycol bisallyl carbonate (CR-39); (Brominated) bisphenol A type di (meth) acrylate homopolymer or copolymer, (brominated) bisphenol A mono (meth) acrylate Thermosetting (meth) acrylic resins such as polymers and copolymers of tan-modified monomers; polyesters, especially polyethylene terephthalate, polyethylene naphthalate and unsaturated polyesters; acrylonitrile-styrene copolymers, polyvinyl chloride, polyurethane, epoxy Resins are preferred. In addition, an aramid resin considering heat resistance can be used. In this case, the upper limit of the heating temperature is 200 ° C. or higher, and the temperature range is expected to be widened.

  The plastic film can be obtained by a method such as stretching these resins, diluting them in a solvent, forming a film and drying them. The thickness is preferably thick from the viewpoint of rigidity, but is preferably thin from the haze side, and is usually about 25 to 500 μm.

  Further, the surface of the plastic film may be coated with a coating material such as a hard coat, and the adhesive property can be obtained by allowing the coating material to exist under the optical multilayer films 12a and 12b made of an inorganic substance and an organic substance. Various physical properties such as hardness, chemical resistance, durability, and dyeability can also be improved.

  An undercoat layer may be provided on the substrate 11 as an optical functional thin film or a transparent support surface treatment. Examples of the undercoat layer include organoalkoxy metal compounds, polyesters, acrylic-modified polyesters, and polyurethanes. Further, it is preferable to perform corona discharge and ultraviolet (UV) irradiation treatment.

(Optical multilayer film)
The optical multilayer films 12a and 12b have a configuration in which high refractive index optical films 12H and low refractive index optical films 12L that are fluorine-containing films are alternately stacked. Specifically, the optical film 12H is first provided on both main surfaces of the substrate 11, then the optical film 12L is provided, and thereafter the optical film 12H and the optical film 12L are alternately provided, and finally the optical film 12H is provided. This is a laminated film composed of 2n + 1 layers (n is an integer of 1 or more).

  The film thickness of the optical film 12H is 80 nm to 15 μm, more preferably 600 to 1000 nm. This is because if the thickness is greater than 15 μm, the haze component due to fine particles that cannot be dispersed increases and the function as an optical film cannot be obtained. The refractive index of the optical film 12H is preferably 1.70 to 2.10. If the refractive index is higher than 2.10, the dispersibility of the fine particles is insufficient and the function as an optical film is impaired. If the refractive index is lower than 1.70, the required optical characteristics are obtained. It may not be possible.

  The optical film 12L is a fluorine-containing film formed by a curing reaction after applying a predetermined underlayer coating material on the optical film 12H. The refractive index is preferably 1.30 to 1.69, and a film having a refractive index of 1.45 or less is particularly preferable. The refractive index of the optical film 12L is determined by the type of resin contained in the paint, and in some cases, the type and amount of fine particles. If the refractive index is higher than 1.69, a difference in refractive index from the optical film 12H cannot be secured, and the reflection characteristics when laminated on the optical film 12H are not sufficient, and the characteristics as a screen are insufficient. . Moreover, it is difficult to form a film having a refractive index lower than 1.3, and the refractive index 1.3 is the lower limit in production. The film thickness of this optical film is 80 nm to 15 μm, more preferably 600 to 1000 nm.

  With the above configuration, the optical multilayer films 12a and 12b have high reflection characteristics for light in the three wavelength bands of red, green, and blue, and at least for light in the visible wavelength region other than these wavelength regions. It has high transmission characteristics. In addition, by adjusting the refractive index and thickness of the optical film 12H and the optical film 12L, it is possible to shift and adjust the wavelength positions of the three wavelength bands reflected as the optical multilayer films 12a and 12b. The optical multilayer films 12a and 12b can be made to correspond to the wavelength of light projected from the projection type image display device 2.

  In addition, the number of layers of the optical film 12H and the optical film 12L constituting the optical multilayer films 12a and 12b is not particularly limited, and can be a desired number of layers. Moreover, it is preferable that the optical multilayer films 12a and 12b are configured by odd layers in which the incident side of the light emitted from the projection type image display device 2 and the outermost layer on the opposite side are the optical films 12H. By configuring the optical multilayer films 12a and 12b as odd layers, the functions as the three primary color wavelength band filters are superior to those of the even layers.

  The specific number of layers of the optical multilayer films 12a and 12b is preferably an odd number of 3 to 7. This is because when the number of layers is 2 or less, the function as a reflective layer is not sufficient. On the other hand, the reflectivity increases as the number of layers increases, but the increase rate of reflectivity decreases when the number of layers is 8 or more, and the effect of improving reflectivity cannot be obtained as the time required for forming the optical multilayer films 12a and 12b is increased. Because.

(Light absorption layer)
The light absorption layer 13 is for absorbing light transmitted through the optical multilayer films 12a and 12b, and is provided on the optical multilayer film 12b. The light absorption layer 13 is formed, for example, by pasting a black resin film on the optical multilayer film 12b. Alternatively, it may be formed by applying a black paint on the optical multilayer film 12b.

(Light diffusion layer)
The light diffusion layer 14 is not particularly limited as long as the surface of one side has an uneven shape, and the constituent material thereof has a property of transmitting light in the wavelength region used in the projection type image display device 2. The layer 14 may be glass or plastic ordinarily used. For example, a transparent epoxy resin may be applied on the optical multilayer film 12a, and unevenness may be provided on the surface by embossing or the like, or a diffusion film having such a shape may be bonded onto the optical multilayer film 12a. Good. The light selectively reflected by the optical multilayer film 12a diffuses when emitted through the light diffusion layer 14, and the viewer can visually recognize a natural image by observing the diffused reflected light. become able to. The diffusion angle in the light diffusion layer 14 is an important factor that determines the visibility, and the diffusion angle is increased by adjusting the refractive index of the material constituting the diffusion plate, the surface unevenness, and the like.

  The screen 1 enables selective reflection that reflects light of a specific wavelength from the projection-type image display device 2 and transmits and absorbs incident light in other wavelength regions such as external light. The level is lowered to achieve high contrast, and a high-contrast image can be displayed even in a bright room. For example, when light from an RGB light source such as a diffraction grating type projector using a grating light valve (GLV) is projected, the screen 1 has a wide viewing angle, high contrast, and reflection of external light. There will be no good video.

  That is, the light incident on the screen 1 is transmitted through the light diffusion layer 14 and reaches the optical multilayer films 12a and 12b, and the external light components included in the incident light are transmitted through the optical multilayer films 12a and 12b to be light. Only the light in a specific wavelength region related to the image is absorbed by the absorption layer 13 and selectively reflected, and the reflected light is diffused on the surface of the light diffusion layer 14 and provided to the viewer as image light having a wide viewing angle. Therefore, the influence of external light on the image light that is the reflected light can be eliminated at a high level, and an unprecedented high contrast can be achieved.

  Next, a method for manufacturing the screen 1 according to one embodiment of the present invention will be described. First, a coating type optical film material for forming the optical film 12H having a high refractive index will be described.

  The coating optical film material is, for example, a material that is applied onto a fluorine-containing film to form an optical film, and is an optical film material in which fine particles are dispersed by a dispersant in an organic solvent in which a binder is dissolved. . Further, this optical film material becomes a high refractive index optical film by a curing reaction after being applied.

The coating optical film material contains fine particles, an organic solvent, a binder that absorbs energy to cause a curing reaction, and a dispersant composed of a lipophilic group and a hydrophilic group having a chemical formula amount of 110 to 3000. The coating is such that the content of the dispersant is 2.2 to 22 μmol / m ² with respect to the fine particles, and the surface tension when applied is 19 dyne / cm or less, for example, coating on a fluorine-containing substrate to form an optical film. Type optical film material. In addition, the fluorine-containing substrate that is a substrate can be applied to substrates and optical thin films of all shapes such as films, plates, and lenses.

  The fine particles of the coating-type optical film material are fine particles of a high refractive index material that is added to adjust the refractive index of the optical film after film formation, and Ti, Zr, Al, Ce, Sn, La, Examples thereof include oxides such as In, Y, and Sb, and alloy oxides such as In—Sn. Even if an appropriate amount of oxide such as Al or Zr is contained in the Ti oxide for the purpose of suppressing the photocatalyst, the effect of the present invention is not disturbed.

Moreover, 55-85 m < ² > / g is preferable and, as for the specific surface area of microparticles | fine-particles, it is more preferable that it is 75-85 m < ² > / g. When the specific surface area is in this range, it is possible to suppress the particle size (primary particle size) of the fine particles in the optical film material to 100 nm or less by dispersing the fine particles, and an optical film having a very small haze can be obtained. Is possible. The content of the fine particles is preferably 2 to 20 wt% in the optical film material.

  Organic solvents include, for example, ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, alcohol solvents such as methanol, ethanol, propanol, butanol, isobutyl alcohol, methyl acetate, ethyl acetate, butyl acetate, propyl acetate, ethyl lactate An ester solvent such as ethylene glycol acetate is used. These organic solvents do not necessarily need to be 100% pure, and may contain impurities such as isomers, unreacted products, decomposed products, oxides, and moisture if they are 20% or less. Further, in order to apply on a support or optical film having a low surface energy, it is desirable to select a solvent having a lower surface tension, and examples thereof include methyl isobutyl ketone, methanol, ethanol and the like.

  Examples of the binder include a thermosetting resin, an ultraviolet (UV) curable resin, and an electron beam (EB) curable resin. Examples of thermosetting resin, UV curable resin, EB curable resin are polystyrene resin, styrene copolymer, polycarbonate, phenol resin, epoxy resin, polyester resin, polyurethane resin, urea resin, melamine resin, polyamine resin, urea Examples include formaldehyde resin. Polymers having other cyclic (aromatic, heterocyclic, alicyclic, etc.) groups may also be used. Further, a resin containing fluorine or silanol group in the carbon chain may be used.

  The method for curing the resin may be either radiation or heating, but when the curing reaction of the binder is performed by ultraviolet irradiation, it is preferably performed in the presence of a polymerization initiator. Examples of radical polymerization initiators include azo initiators such as 2,2′-azobisisobutyronitrile and 2,2′-azobis (2,4-dimethylvaleronitrile); benzoyl peroxide, lauryl peroxide And peroxide initiators such as t-butyl peroctoate. The amount of these initiators used is 0.2 to 10 parts by weight, more preferably 0.5 to 5 parts by weight, per 100 parts by weight of the total polymerizable monomers. The content of the binder is preferably 3 to 32 wt% in the optical film material.

  In addition to improving the dispersibility of the fine particles, the dispersant takes a form in which the dispersant oriented on the surface of the fine particles by the dispersion is oriented on the surface of the optical film material. Suitable for lowering. The dispersant is composed of a lipophilic group and a hydrophilic group, and the introduction site of the polar functional group which is a hydrophilic group is not particularly limited.

  The weight average molecular weight (chemical formula weight) of the lipophilic group contained in the dispersant is 110 to 3000. If the molecular weight is lower than 110, there are problems such as insufficient dissolution in the organic solvent, and if the molecular weight exceeds 3000, sufficient dispersibility of the fine particles in the optical film cannot be obtained. Note that the dispersant may have a functional group for causing a curing reaction with the binder.

The amount of the hydrophilic functional group contained in the dispersant is 10 ⁻³ to 10 ⁻¹ mol / g. When the functional group is smaller or larger than this, the effect on the dispersion of the fine particles is not exhibited, leading to a decrease in dispersibility. Moreover, since the functional group as shown below as a polar functional group does not become an aggregated state, it is useful. That is, —SO ₃ M, —OSO ₃ M, —COOM, P = 0 (OM) ₂ (wherein M is a hydrogen atom or an alkali metal such as lithium, potassium, sodium, etc.), 3 Quaternary amine, quaternary ammonium salt (R ₁ (R ₂ ) (R ₃ ) NHX (where R ₁ , R ₂ , R ₃ are hydrogen atoms or hydrocarbon groups, X ⁻ is chlorine, bromine) And halogen element ions such as iodine or inorganic / organic ions.)), Polar functional groups such as —OH, —SH, —CN, and epoxy groups. These dispersants can be used singly or in combination of two or more.

The content of the dispersant is 2.2 to 22 μmol / m ² with respect to the fine particles. When the content is less than 2.2 μmol / m ² , sufficient dispersibility cannot be obtained in the optical film, and further, an effective surface tension lowering effect cannot be obtained. Conversely, if the content is greater than 22 μmol / m ^{2, the} surface tension decreases regardless of the dispersion state of the fine particles, but the volume ratio of the dispersant in the optical film increases, so that the refractive index of the film decreases and the refractive index Since the adjustment range of the rate becomes narrow, the optical film stacking design becomes difficult. The molecular weight of the dispersant may be measured by a gel permeation chromatograph (GPC) method. Further, the content of the dispersant in the coating film of the optical film material is 20 to 60 parts by weight, more preferably 38 to 55 parts by weight with respect to 100 parts by weight of the fine particles. In addition, when it contains binders other than the dispersing agent of this invention, the polyfunctional polymer or monomer which has many coupling groups is preferable.

  The coated optical film material has a surface tension of 19 dyne / cm or less when coated, and can be uniformly coated on a film having a low surface energy such as a fluorine-containing film. Further, after the coating, the curing reaction is accelerated by light or thermal energy, and a high refractive index type optical film is obtained.

  The optical film material is produced by a kneading step, a dispersing step, and a mixing step provided as necessary before and after these steps. All raw materials such as fine particles, resin, and solvent used in the present invention may be added at the beginning or during any step. In addition, individual raw materials may be added in two or more steps. For dispersion and kneading, a conventionally known apparatus such as an agitator or a paint shaker may be used.

FIG. 6 is a flowchart for explaining a screen manufacturing method according to an embodiment of the present invention. Hereinafter, a method for manufacturing a screen according to the embodiment will be described with reference to FIG.
(Step S1)
First, the substrate 11 made of a polyethylene terephthalate (PET) film or the like is washed.

(Step S2)
Next, a predetermined amount of the above-described coating type optical film material is applied to both main surfaces of the substrate 11 by, for example, a dipping method. Then, after drying the coating film of the coating type optical film material, for example, it is cured by irradiating with ultraviolet rays to form the optical film 12H having a predetermined film thickness.

(Step S3)
Next, a predetermined amount of fluorine-containing underlayer paint is applied onto the optical film 12H by, for example, a dipping method. Then, after drying the coating film, for example, thermosetting is performed to form an optical film 12L having a predetermined film thickness. Thereby, it becomes a laminated structure of the optical film 12H and the optical film 12L.

(Step S4)
Next, the above-described coating type optical film material is applied onto the optical film 12L on the outermost layer of the substrate 11 by, for example, a dipping method. And after drying the coating film of the coating type optical film material, for example, it is cured by irradiating with ultraviolet rays to form an optical film 12H having a predetermined film thickness. Thereafter, the steps S2 and S3 are performed a predetermined number of times according to the configuration of the optical multilayer films 12a and 12b to form the optical multilayer films 12a and 12b on the substrate 11.

(Step S5)
Next, a black resin film is bonded onto the optical multilayer film 12 b to form the light absorption layer 13. Alternatively, the light absorption layer 13 may be formed by applying a resin containing a black light absorber on the optical multilayer film 12b and curing the applied resin.

(Step S6)
Next, a transparent adhesive having a low refractive index (EPOTEK396 manufactured by EPOXY TECHNOLOGY) is applied to the outermost layer surface of the optical multilayer film 12a, and a surface opposite to the uneven surface of the plate-shaped light diffusion layer 14 is formed thereon. After mounting as a contact surface, the adhesive is cured to form an adhesive layer that bonds the optical multilayer film 12a and the light diffusion layer 14 together. Thereby, the target screen 1 is manufactured.

  In the above manufacturing process, the coating optical film material can be uniformly applied onto the substrate 11 and the optical film 12L having low surface energy. That is, since the dispersant used in the coating optical film material of the present invention has a predetermined relationship with the fine particles, the surface tension of the coating optical film material is higher than the surface energy of the substrate 11 and the optical film 12L. It is possible to achieve a uniform application of a coating type optical film material on the substrate 11 and the optical film 12L, and to form a desired optical film 12H, and thus an optical multilayer film 12a having desired reflection characteristics. , 12b can be obtained.

  Needless to say, as a coating method of the coating type optical film material, conventionally known coating methods such as gravure coating, roll coating, blade coating, and die coating can be used in addition to the dipping method.

  FIG. 7 shows an example of the configuration of the projection type image display device 2 according to one embodiment of the present invention. As shown in FIG. 7, the projection type image display apparatus 2 mainly includes a first light source 21, a micro lens array 22, a second light source 41, a micro lens array 42, a dichroic mirror 23, a micro lens array 24, and a PS. Converter 25, condenser lens 26, dichroic mirror 27, condenser lens 26, mirror 29, condenser lens 33, dichroic mirror 34, relay lens 35, mirror 36, relay lens 37, mirror 38, condenser lenses 30B, 30G, 30R, polarizing plate 31B, 31G, 31R, liquid crystal panels (LCD) 32B, 32G, 32R, polarizing plates 45B, 45G, 45R, a cross beam combiner prism 39 and a projection lens 40.

  The first light source 21 is a light source that emits light having blue and green color components among the three primary colors, and is a high-pressure mercury lamp. The pressure of mercury vapor in this high pressure mercury lamp is, for example, about 100 atm or less. Although the case where the first light source 21 is a high-pressure mercury lamp will be described here, it goes without saying that the first light source 21 is not limited to this example.

  FIG. 8A shows an example of the spectral characteristics of the first light source 21. FIG. 8B shows the wavelength band of light used for image display among the light emitted from the first light source 21. FIG. 8C shows an example of the spectral characteristics of the second light source 41 when a red semiconductor laser (wavelength 650 nm) is used as the second light source 41.

  As shown in FIG. 8A, the light emitted from the high-pressure mercury lamp that is the first light source 21 contains blue and green components, but does not contain red color components. Therefore, in the projection type image display apparatus 2 according to this embodiment, light in the wavelength band shown by the broken line in FIG. 8B is used as the blue and green color components, and further, the red color component is broken by the broken line in FIG. 8C. The light of the wavelength band indicated by

  The second light source 41 is arranged so that the optical path of the light emitted from the second light source 41 and the optical path of the light emitted from the first light source 21 intersect at a right angle. The second light source 41 is a light source that emits red light, and preferably a light source that emits red light having a narrow wavelength band. For example, one or two or more red semiconductor lasers or red that emit red light. It consists of a light emitting diode (hereinafter red LED). When the second light source 41 is composed of two or more red semiconductor lasers or red LEDs, these are arranged in a matrix or concentric circles. The number of red semiconductor lasers or red light emitting diodes constituting the second light source 41 is selected according to the wavelength and output of the emitted light. For example, when a semiconductor laser having a wavelength of 670 nm and an output of 500 mW is used, The second light source 41 is composed of nine red semiconductor lasers. The wavelength of the light emitted from the second light source 41 is preferably selected from the range of 640 nm to 690 nm, more preferably selected from the range of 650 nm to 670 nm, for example, 650 nm. In consideration of the versatility of the semiconductor laser, the wavelength of light emitted from the second light source 41 is preferably selected to be 650 nm.

  FIG. 9 shows an example of spectral characteristics of the projection type image display apparatus 2 when a red semiconductor laser is used as the second light source 41. FIG. 10 shows an example of spectral characteristics of the projection type image display apparatus 2 when a red LED is used as the second light source 41. 9 and 10, the solid line indicates the spectral characteristic of the projection type image display device 2, and the broken line indicates the reflection wavelength characteristic of the screen 1. As shown in FIGS. 9 and 10, the wavelength band of the blue and green color components emitted from the first light source 21 and the wavelength band of the red light emitted from the second light source 41 are It is selected according to the reflection wavelength characteristic. It is preferable to select the wavelength bands of the first light source 21 and the second light source 41 so as to substantially coincide with the wavelength bands of the three primary colors, in which the reflection intensity increases on the screen 1.

  Note that it is preferable to use a high-power red LED as the second light source 41. In this case, a speckle noise reduction mechanism, safety and the like can be facilitated, rather than using a red semiconductor laser as the second light source 41.

  The microlens array 22 is provided in the vicinity of the emission part of the first light source 21. The microlens array 42 is provided in the vicinity of the emission part of the second light source 41. The microlens array 24 is provided on an optical path that goes straight from the second light source 41. The microlens arrays 22 and 24 constitute a beam homogenizer that makes the luminance distribution uniform. Further, the microlens arrays 42 and 24 constitute a beam homogenizer that makes the luminance distribution uniform. Although not shown here, a filter is provided between the first light source 21 and the microlens array 22 to remove infrared components and ultraviolet components that are unnecessary for the display image. .

  The dichroic mirror 23 has a flat plate shape and is disposed at a position where the optical path of the first light source 21 and the optical path of the second light source 41 intersect. One principal surface of the dichroic mirror 23 and the optical path of the first light source 21 form an angle of, for example, about 45 degrees. The dichroic mirror 23 reflects the light emitted from the first light source 21 toward the microlens array 24, transmits the light emitted from the second light source 41, and enters the microlens array 24. That is, the dichroic mirror 23 combines the light emitted from the first light source 21 and the light emitted from the second light source 41 and emits the light toward the microlens array 24.

  The PS converter 25 and the condenser lens 26 are arranged on an optical path that goes straight from the second light source 41. The PS converter 25 converts light incident from the dichroic mirror 23 via the microlens array 24 into light having a predetermined polarization direction (for example, converts P-polarized light into S-polarized light), and a condenser lens 26. Through the dichroic mirror 27.

  The dichroic mirror 27 has a flat shape and directs only light having a blue color component of light incident through the condenser lens 26 on the optical path straight from the second light source 41 toward the mirror 29. It arrange | positions so that the light which reflects and may have other red and green color components may be transmitted toward the dichroic mirror 34. One main surface of the dichroic mirror 27 and an optical path going straight from the second light source 41 form an angle of, for example, about 45 degrees.

  The condenser lens 28 is a concave lens, for example, and is disposed on the optical path of blue light reflected by the dichroic mirror 27. The mirror 29 has a flat plate shape and reflects blue light incident through the condenser lens 28 on the optical path of the blue light reflected by the dichroic mirror 27 toward the direction of the cross beam combiner prism 39. Is arranged. One main surface of the mirror 29 and the optical path of the blue light reflected by the dichroic mirror 27 form an angle of about 45 degrees, for example.

  The condenser lens 30B, the polarizing plate 31B, the liquid crystal panel 32B, and the polarizing plate 45B are disposed on the optical path of the blue light reflected by the mirror 29. The polarizing plate 31B polarizes blue light incident from the mirror 29 via the condenser lens 30B and outputs the polarized blue light to the liquid crystal panel 32B. The liquid crystal panel 32B is controlled by a control unit (not shown), spatially modulates the blue light emitted from the polarizing plate 31B, and outputs the blue light to the polarizing plate 45B. The polarizing plate 45 </ b> B modulates the blue light spatially modulated by the liquid crystal panel 32 </ b> B and emits it to the cross beam combiner prism 39.

  The condenser lens 33 is, for example, a concave lens, and is disposed on the optical path that goes straight from the second light source 41. The dichroic mirror 34 has a flat shape, and only the light having the green color component among the light transmitted through the dichroic mirror 27 is passed to the cross beam combiner prism 39 on the optical path straight from the second light source 41. It arrange | positions so that the light which reflects toward and may transmit the light which has a red color component other than that toward the mirror 36 may be transmitted. One main surface of the dichroic mirror 34 and an optical path that goes straight from the second light source 41 form an angle of, for example, about 45 degrees.

  The condenser lens 30G, the polarizing plate 31G, the liquid crystal panel 32G, and the polarizing plate 45G are arranged on the optical path of green light reflected by the dichroic mirror 34. The polarizing plate 31G polarizes green light incident from the dichroic mirror 34 via the condenser lens 30G, and emits it to the liquid crystal panel 32G. The liquid crystal panel 32G is controlled by a control unit (not shown), spatially modulates the green light emitted from the polarizing plate 31G, and outputs the green light to the polarizing plate 45G. The polarizing plate 45G modulates the green light spatially modulated by the liquid crystal panel 32G and outputs the green light to the cross beam combiner prism 39.

  The relay lens 35 is, for example, a convex lens, and is disposed on an optical path that goes straight from the second light source 41. The relay lens 35 is for eliminating an apparent optical path difference. The mirror 36 has a flat plate shape and is disposed so as to reflect red light incident from the dichroic mirror 34 via the relay lens 35 toward the mirror 38. One main surface of the mirror 36 and an optical path straight from the second light source 41 form an angle of, for example, about 45 degrees. The relay lens 37 is a convex lens, for example, and is disposed on the optical path of red light reflected by the mirror 36.

  The mirror 38 has a flat plate shape and is disposed so as to reflect red light incident from the mirror 36 via the relay lens 37 toward the cross beam combiner prism 39. One main surface of the mirror 38 and an optical path of red light guided by the mirror 36 form an angle of, for example, about 45 degrees.

  The condenser lens 30R, the polarizing plate 31R, the liquid crystal panel 32R, and the polarizing plate 45R are disposed on the optical path of red light reflected by the mirror 38. The polarizing plate 31R polarizes red light incident from the mirror 38 via the condenser lens 30R and emits it to the liquid crystal panel 32R. The liquid crystal panel 32R is controlled by a control unit (not shown), spatially modulates the red light emitted from the polarizing plate 31R, and outputs the red light to the polarizing plate 45R. The polarizing plate 45 </ b> R modulates the red light spatially modulated by the liquid crystal panel 32 </ b> R and outputs the red light to the cross beam combiner prism 39.

  The cross beam combiner prism 39 combines the light of the three colors incident from the liquid crystal panels 32B, 32G, and 32R, and outputs the combined light to the projection lens 40 as white light. The projection lens 40 projects the light incident from the cross beam combiner prism 39 onto the screen 1.

Next, the operation of the projection type image display apparatus 2 configured as described above will be described.
The light emitted from the first light source 21 passes through the microlens array 22, is reflected by the dichroic mirror 23, and enters the microlens array 24. On the other hand, the light emitted from the second light source 41 passes through the microlens array 42, passes through the dichroic mirror 23, and enters the microlens array 24.

  The light that has entered the microlens array 24 is transmitted through the microlens array 24, converted into a polarized wave (for example, a P-polarized wave) having a predetermined polarization direction by the PS converter 25, and then transmitted to the dichroic mirror 27 via the condenser lens 26. Led.

  Of the light guided to the dichroic mirror 27, only the light having a blue color component is reflected by the dichroic mirror 27 and guided to the mirror 29 via the condenser lens 28. The blue light guided to the mirror 29 is reflected by the mirror 29 and guided to the cross beam combiner prism 39 through the condenser lens 30B, the polarizing plate 31B, the liquid crystal panel 32B, and the polarizing plate 45B. On the other hand, light having green and red color components passes through the dichroic mirror 27 and enters the dichroic mirror 34 via the condenser lens 33.

  Of the light incident on the dichroic mirror 34, only the light having the green color component is reflected by the dichroic mirror 34, and the cross beam combiner prism 39 is passed through the condenser lens 30G, the polarizing plate 31G, the liquid crystal panel 32G, and the polarizing plate 45G. Led to. On the other hand, light having a red color component passes through the dichroic mirror 34 and enters the mirror 36 via the relay lens 35.

  The red light incident on the mirror 36 is reflected by the mirror 36 and guided to the mirror 38 via the relay lens 37. The light guided to the mirror 38 is reflected by the mirror 38 and guided to the cross beam combiner prism 39 through the condenser lens 30R, the polarizing plate 31R, the liquid crystal panel 32R, and the polarizing plate 45R.

  The light beams of the respective colors guided to the cross beam combiner prism 39 are combined by the cross beam combiner prism 39 and projected onto the screen 1 through the projection lens 40.

According to one embodiment of the present invention, the following advantages can be obtained.
The first light source 21 emits light having blue and green color components of the three primary colors, the second light source 41 emits red light, and the dichroic mirror 23 emits light emitted from the first light source 21; In order to synthesize the light emitted from the second light source 41, the red color component lacking in the light emitted from the first light source 21 is supplemented by the red light emitted from the second light source 41. Accordingly, the advantage that the wavelength selectivity effect of the screen 1 can be improved can be obtained. That is, it is possible to obtain the advantages that the contrast of the display image can be increased and the red color reproduction range can be expanded.

  Further, since a red semiconductor laser or a red LED having a narrow wavelength band and a sufficient amount of emitted light is used as the second light source 41, a conventional projection type image display system having only an ultrahigh pressure mercury lamp as a light source. As compared with the above, it is possible to improve the wavelength selectivity effect of the screen 1, thereby obtaining an advantage that a higher-contrast image display can be realized.

  Further, since a red semiconductor laser or a red LED having a narrow wavelength band and a sufficient amount of emitted light is used as the second light source 41, the red color purity in the main body of the projection type image display apparatus 2 can be increased. Further, by combining with the screen 1 having wavelength selectivity, an advantage that an image display with higher color reproducibility can be realized can be obtained.

  Further, since a red semiconductor laser or a red LED is used as the second light source 41, the second light source 41 can be designed in accordance with the reflection wavelength of the red light reflected by the screen 1. On the other hand, the screen 1 can be designed in accordance with a red semiconductor laser or red LED which is efficient and inexpensive. Thereby, the advantage that the freedom degree of design of a projection type image display system can be increased can be acquired.

  Further, the red light that is insufficient in the first light source 21 such as a high-pressure mercury lamp can be supplemented by a red semiconductor laser or a red LED, thereby improving the light use efficiency of the lamp after color balance. The advantage that it can be increased can be obtained.

  In addition, the amount of red light can be adjusted independently of the first light source 21, whereby the light use efficiency of the lamp can be easily optimized.

  In addition, the amount of the red spectrum can be adjusted independently of the spectrum of the first light source 21, thereby obtaining the advantage that the green and blue spectra of the first light source 21 can be optimally used. it can. Further, it is possible to increase the use efficiency of the lamp after the color balance has been achieved, thereby simplifying the cooling mechanism and, as a result, obtaining the advantage that the cooling fan noise can be reduced.

  Moreover, since several types of red lasers and red LEDs having different wavelengths are commercially available, the degree of design freedom of the screen 1 can be easily increased. Further, it is possible to design a screen according to an efficient and inexpensive red semiconductor laser or red LED.

  Moreover, since the projection type image display apparatus 2 can show a more obvious effect in combination with the screen 1 having wavelength selectivity by Bragg reflection, it can promote the sales of the screen 1 main body. Further, as a system product combining the screen 1 and the projection type image display device 2, a new sales channel and a new purchase layer different from the conventional projector system can be developed.

An embodiment of the projection type image display system will be described.
Example The second light source 41 was configured by arranging nine semiconductor lasers (wavelength 670 nm, output 500 mW) in a 3 × 3 matrix. Further, as the dichroic mirrors 23, 27, and 34, dichroic mirrors having the spectral characteristics shown in FIGS. 11A, 11B, and 11C were used. In FIG. 11A, FIG. 11B, and FIG. 11C, the transmittance of light incident at right angles to one main surface of the dichroic mirrors 23, 27, and 34 is indicated by a solid line, and one main surface of the dichroic mirrors 23, 27, and 34 is shown. The transmittance of light incident at an angle of 45 degrees with respect to is shown by a broken line.

Conventional Example In addition, a conventional example was created for comparison with the examples. This conventional example is the same as that described above except that the second light source 41 is omitted and the first light source 21 is provided with an ultrahigh pressure mercury lamp (manufactured by Philips) having an output of 120 W. This is the same as the embodiment.

  Then, the CIE 1976 UCS chromaticity diagram (u′v ′ chromaticity diagram) of the example and the conventional example configured as described above was created. FIG. 12 shows the CIE 1976 UCS chromaticity diagram. For reference, FIG. 12 also shows an HDTV (High Definition Television) color reproduction range.

  From FIG. 12, it can be seen that the embodiment can expand the color reproduction range near red as compared with the conventional example, and thus the color reproduction range can be expanded about 1.5 times. Therefore, in the embodiment, it can be seen that a red image such as sunset and autumn leaves can be expressed more clearly than in the conventional example.

  Next, another embodiment of the present invention will be described. In the above-described embodiment, the case where the red light emitted from the second light source 41 and the light emitted from the first light source 21 are combined by the dichroic mirror 23 has been described. In the embodiment, a case where the red light emitted from the second light source 41 is directly incident on the cross beam combiner prism 39 will be described.

  FIG. 13 shows an example of the configuration of a projection type image display apparatus 2 according to another embodiment of the present invention. As shown in FIG. 13, the second light source 41 is arranged at a position where red light can be incident on the cross beam combiner prism 39 via the condenser lens 30R, the polarizing plate 31R, the liquid crystal panel 32R, and the polarizing plate 45R. Yes. The mirror 43 is disposed at a position that reflects the light emitted from the first light source 21 toward the microlens array 24. The mirror 44 is disposed at a position where the green light that has passed through the dichroic mirror 27 is reflected toward the cross beam combiner prism 39.

  A beam homogenizer composed of the microlens arrays 46 and 47 is disposed between the second light source 41 and the condenser lens 30R. This beam homogenizer makes the luminance distribution of the red light emitted from the second light source 41 uniform. A relay lens may be appropriately provided between the second light source 41 and the condenser lens 30R according to the distance between the liquid crystal panel 32R and the second light source 41. Further, an optical system for uniformly irradiating the liquid crystal panel 32R may be appropriately provided between the second light source 41 and the condenser lens 30R. Other than this, the description is omitted because it is substantially the same as the above-described embodiment.

According to another embodiment of the present invention, the following advantages can be obtained in addition to the advantages obtained in the above-described embodiment.
Since the red light emitted from the second light source 41 is directly incident on the cross beam combiner prism 39, the process of separating the red light by a dichroic mirror or the like can be omitted. The advantage that the configuration can be further simplified can be obtained.

  As mentioned above, although embodiment of this invention was described concretely, this invention is not limited to the above-mentioned embodiment, The various deformation | transformation based on the technical idea of this invention is possible.

  For example, the numerical values given in the above embodiment are merely examples, and different numerical values may be used as necessary.

  In the above-described embodiment, an ultrahigh pressure mercury lamp may be used as the first light source 21. In the above-described embodiment, the second light source 41 may be configured by combining a red semiconductor laser and a red LED.

  In the above-described embodiment, the present invention is applied to a projection type image display system including the screen 1 having wavelength selectivity and the projection type image display device 2 that emits light according to the wavelength selectivity of the screen 1. However, the present invention is not limited to this example. That is, the present invention can be applied to a projection-type image display system including a conventional screen (screen having no wavelength selectivity) and a projection-type image display device that projects an image on the screen. Needless to say. In this case, when color balance is achieved, it is possible to prevent red from becoming rate-determining, and it is possible to obtain an advantage that red color purity can be improved.

  In the embodiment described above, the screen 1 is formed with optical multilayer films 12a and 12b having the same configuration on both main surfaces of the substrate 11, as shown in FIG. The case where the light diffusion layer 14 is formed on the outer layer surface and the light absorption layer 13 is formed on the outermost layer surface of the other optical multilayer film 12b is shown as an example. However, the configuration of the screen 1 is limited to this example. It is not something that can be done. For example, an optical multilayer film may be provided on only one of the two main surfaces of the substrate 11. This screen 1 also reflects light of a specific wavelength from the projection-type image display device 2 and transmits and absorbs incident light in other wavelength regions such as outside light, thereby reducing the black level on the screen 1 and increasing it. It is possible to achieve contrast.

It is a basic diagram which shows an example of a structure of the projection type image display system by one Embodiment of this invention. FIG. 2A is a graph schematically showing human visual characteristics (visible wavelength characteristics), FIG. 2B is a graph schematically showing reproduced wave characteristics of the projection-type image display device 2, and FIG. FIG. 2D is a graph schematically showing the wavelength characteristics of the ambient light emitted from the ambient light generator 3. It is sectional drawing which shows an example of a structure of the screen by one Embodiment of this invention. It is a graph which shows an example of the reflected wave characteristic of the screen by one Embodiment of this invention. It is a graph which shows the wavelength characteristic of a fluorescent lamp. It is a flowchart for demonstrating the manufacturing method of the screen by one Embodiment of this invention. It is a basic diagram which shows an example of a structure of the projection type image display apparatus by one Embodiment of this invention. FIG. 8A is a graph showing an example of the spectral characteristics of the first light source provided in the projection-type image display device according to the embodiment of the present invention, and FIG. 8B is an image of the light emitted from the first light source. FIG. 8C is a graph showing an example of spectral characteristics of the second light source provided in the projection type image display apparatus according to the embodiment of the present invention. It is a graph which shows an example of the spectral characteristic of the projection type image display apparatus by one Embodiment of this invention. It is a graph which shows an example of the spectral characteristic of the projection type image display apparatus by one Embodiment of this invention. 11A is a graph showing the characteristics of the dichroic mirror 23 of the example, FIG. 11B is a graph showing the characteristics of the dichroic mirror 27 of the example, and FIG. 11C is a graph showing characteristics of the dichroic mirror 34 of the example. It is a CIE1976UCS chromaticity diagram of an Example. It is a basic diagram which shows an example of a structure of the projection type image display apparatus by other Embodiment of this invention. 14A is a graph showing the spectral distribution at a mercury vapor pressure of 3 MPa, FIG. 14B is a graph showing the spectral distribution at a mercury vapor pressure of 15 MPa, and FIG. 14C is a graph showing the spectral distribution at a mercury vapor pressure of 22 MPa. It is a basic diagram which shows the structure of the conventional projector provided with the ultra high pressure mercury lamp. It is a graph which shows the spectral characteristics of the ultrahigh pressure mercury lamp used as a light source. 17A is a graph showing the spectral characteristics of blue light separated by a dichroic mirror, FIG. 17B is a graph showing the spectral characteristics of green light separated by a dichroic mirror, and FIG. 17C is a red light separated by a dichroic mirror. It is a graph which shows the spectral characteristics of this.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Screen, 2 ... Projection-type image display apparatus, 3 ... Ambient light generator, 21 ... 1st light source, 22, 24, 42, 46, 47 ... Micro lens array, 25 ... PS converter, 23, 27, 34 ... Dichroic mirror, 29, 36, 38 ... Mirror, 26, 28, 33, 30B, 30G, 30R ... Condenser lens, 31B, 31G, 31R 45B, 45G, 45R ... polarizing plate, 32B, 32G, 32R ... liquid crystal panel, 35, 37 ... relay lens, 39 ... cross beam combiner prism, 40 ... projection lens, 41. ..Second light source

Claims (8)

In a projection-type image display system comprising a screen and a projection-type image display device that projects an image on the screen,
Screen
A light absorbing layer that absorbs at least light in the visible light region;
An optical multilayer film provided on the light absorption layer and selectively reflecting blue, green and red light;
Projection type image display device
A first light source that emits light having blue and green color components among the three primary colors;
A second light source that emits red light;
A combining means for combining the light emitted from the first light source and the light emitted from the second light source;
The first light source is a mercury lamp having a mercury vapor pressure of 100 atm or less;
The second light source is a light source that emits red light having a narrow wavelength band;
A wavelength band corresponding to blue and green color components emitted from the first light source and a wavelength band of red light emitted from the second light source are selected according to the reflection wavelength characteristics of the screen. A projection-type image display system.   2. The projection type image display system according to claim 1, wherein the second light source comprises one or more red semiconductor lasers or red light emitting diodes.   2. The projection type image display system according to claim 1, wherein the mercury lamp is a mercury lamp having no red component. The screen is a projection-type image display system according to claim 1, characterized in that the screen has a wavelength selectivity by black grayed reflected. In a projection-type image display system comprising a screen and a projection-type image display device that projects an image on the screen,
Screen
A light absorbing layer that absorbs at least light in the visible light region;
An optical multilayer film provided on the light absorption layer and selectively reflecting blue, green and red light;
Projection type image display device
A first light source that emits light having blue and green color components among the three primary colors;
A second light source that emits red light;
Separating means for separating light emitted from the first light source into blue light and green light;
Modulation means for modulating blue light and green light separated by the separation means and red light emitted from the second light source;
And combining means for combining blue light, green light and red light modulated by the modulating means,
The first light source is a mercury lamp having a mercury vapor pressure of 100 atm or less;
The second light source is a light source that emits red light having a narrow wavelength band;
A wavelength band corresponding to blue and green color components emitted from the first light source and a wavelength band of red light emitted from the second light source are selected according to the reflection wavelength characteristics of the screen. A projection-type image display system.   6. The projection type image display system according to claim 5, wherein the second light source comprises one or more red semiconductor lasers or red light emitting diodes.   6. The projection type image display system according to claim 5, wherein the mercury lamp is a mercury lamp having no red component. The screen is a projection-type image display system according to claim 5, characterized in that the screen has a wavelength selectivity by black grayed reflection.

Images