JP2000221322A - Ultraviolet and infrared ray shielding filter and projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a UV and IR shielding filter capable of sharply shielding unnecessary UV and IR by a simple structure and inhibiting heat generation due to light absorption and to provide a projection type display device using the filter. SOLUTION: The UV and IR shielding filter 22 includes a transparent substrate 22a and an optical multilayered film consisting of high refractive index material layers 22b and low refractive index material layers 22c alternately laminated on the surface of the transparent substrate. At least one layer 22d among the high refractive index material layers and the low refractive index material layers comprises a transparent electrically conductive material. All of the high refractive index material layers preferably comprise the transparent electrically conductive material. The transparent electrically conductive material is preferably ITO(indium-tin oxide) or Al-containing ZnO.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet / infrared cut filter and a projection display device using the same.

[0002]

2. Description of the Related Art In recent years, with the spread of multimedia devices and personal computers, demands for large-sized display devices have been increasing. In particular, recently, for example, a liquid crystal projector using a light modulating means such as a liquid crystal panel has been widely used as a screen display of a television receiver or a so-called presentation display device using a personal computer. Such a liquid crystal projector is configured, for example, as shown in FIG. In FIG. 10, a liquid crystal projector 1 is a so-called three-panel type liquid crystal projector, and includes a light source 2, an ultraviolet-infrared cut filter 3, a multi-lens array 4, dichroic mirrors 5r and 5b as color separation means, and reflection mirrors 6a and 6b. 6b, 6c, 6d, liquid crystal panels 7r, 7g, 7b corresponding to each color, a cross prism 8, a projection lens 9, and a screen S.

As the light source 2, for example, a metal halide lamp or a halogen lamp is used. The ultraviolet / infrared cut filter 3 cuts ultraviolet light and infrared light of incident light from the light source 2 and transmits only visible light. The multi-lens array 4 has a known configuration, and in the illustrated case, two sets of multi-lens arrays are used to make the light intensity distribution of incident light uniform.

[0004] Among the dichroic mirrors 5r and 5b, the dichroic mirror 5r reflects red light and transmits blue light and green light, and the dichroic mirror 5b reflects blue light and transmits red light and green light. It is configured to transmit light. Thereby, the blue light color-separated by the dichroic mirrors 5r and 5b,
Regarding the red light and the green light, the red light is reflected by the reflection mirror 6a,
6b, the green light directly enters, and the blue light enters the corresponding liquid crystal panels 7r, 7g, 7b via the reflection mirrors 6c, 6d.

The liquid crystal panels 7r, 7g, and 7b have a known configuration, and are driven and controlled by a drive circuit (not shown) based on video signals corresponding to respective colors to display a pattern corresponding to an image. It is configured to be. The cross prism 8 has a known configuration, and transmits light from the liquid crystal panel 7g and reflects light from the liquid crystal panels 7r and 7b.
The light (video) from each of the liquid crystal panels 7r, 7g, 7b is synthesized and output. The above projection lens 9
Is configured so that an image synthesized by the cross prism 8 is incident and forms an image on the screen S.

According to the liquid crystal projector 1 having such a configuration, the light from the light source 2 is blocked by the ultraviolet and infrared cut filter 3 from the ultraviolet and infrared rays, only visible light is transmitted, and the light from the multi-lens array 4 is transmitted. After the intensity distribution is made uniform, color separation is performed by the dichroic mirrors 5r and 5b, and the color-separated colors, that is, red light, green light, and blue light enter the liquid crystal panels 7r, 7g, and 7b, respectively. Here, each of the liquid crystal panels 7r, 7g, 7b is driven and controlled by a driving circuit (not shown) based on a video signal corresponding to each color of a video to be displayed.
The images of each color are transmitted through the liquid crystal panels 7r, 7g, and 7b, enter the cross prism 8, are combined as one color image, and are projected on the screen S via the projection lens 9.

Here, the ultraviolet and infrared cut filter 3
Is configured, for example, as shown in FIG. 11 or FIG. In FIG. 11, the ultraviolet-infrared cut filter 3
a is a so-called reflection type structure in which a titanium dioxide (TiO2) layer 3c as a high refractive index material layer and a silicon dioxide (SiO2) layer 3d as a low refractive index material layer are formed on the surface of a float glass substrate 3b. By alternately laminating the layers, an optical multilayer film is formed, and light of a specific wavelength is selectively transmitted and reflected by the interference of light. In FIG. 12, the ultraviolet-infrared cut filter 3e
Is a so-called absorption-type configuration, which is configured by adding in advance to the composition of the glass substrate 3f, an element 3g such as Fe, V, or Ce that absorbs an ultraviolet region or an infrared region.

[0008]

By the way, these ultraviolet and infrared cut filters 3a and 3e are respectively shown in FIG.
Have spectral transmission characteristics indicated by characteristic curves A and B.
Therefore, in the case of the reflection type ultraviolet / infrared cut filter 3a, the transmittance in the visible light region is very high, and ultraviolet and infrared rays are cut very sharply on both sides of the visible light region. Infrared in the area cannot be blocked.

On the other hand, in the case of the absorption type ultraviolet / infrared cut filter 3e, although the infrared cut characteristics in the long wavelength region are very excellent, unnecessary ultraviolet and infrared rays are sharply cut on both sides of the visible light region. Can not. Further, in the case of this absorption type, since all the absorbed light is converted into heat, the temperature of the filter itself rises due to long-time use, and the ultraviolet-infrared cut filter 3e itself becomes a heat source, and The temperature may rise and in some cases the filter itself may crack.

As described above, the characteristics in the infrared region are not sufficient in both the reflection type and the absorption type, and in particular, in the reflection type, depending on the use environment,
The temperature in the optical unit of the liquid crystal projector 1 may rise more than necessary, and for example, the performance of the liquid crystal panels 7r, 7g, 7b made of a polymer material is deteriorated, and the image quality is deteriorated. For this reason, usually, a plurality of cooling fans are provided in the liquid crystal projector 1. However, the installation of the cooling fans increases the number of parts, increases the overall cost, and requires an installation space. Therefore, there is a problem that the liquid crystal projector becomes large.

In view of the above, the present invention provides an ultraviolet-infrared cut filter capable of sharply cutting unnecessary ultraviolet rays and infrared rays with a simple structure and eliminating heat generated by light absorption. An object of the present invention is to provide a projection type display device using the same.

[0012]

According to the present invention, there is provided an optical multilayer film comprising a transparent substrate and a high refractive index material layer and a low refractive index material layer alternately laminated on the surface of the transparent substrate. An ultraviolet-infrared cut filter comprising:
This is achieved when at least one of the high refractive index material layer and the low refractive index material layer is made of a transparent conductive material.

Further, according to the present invention, the above object includes a transparent substrate and an optical multilayer film comprising a high refractive index material layer and a low refractive material layer alternately laminated on one surface of the transparent substrate. This is achieved by forming a transparent conductive material layer on the other surface of the transparent substrate.

According to the present invention, the above object is also provided, comprising: a screen; a light source, an ultraviolet-infrared cut filter, a liquid crystal panel, and a projection lens which are sequentially arranged on an optical axis toward the screen. The projection display device, wherein the infrared cut filter includes a transparent substrate and an optical multilayer film composed of a high-refractive-index material layer and a low-refractive-index material layer alternately laminated on the surface of the transparent substrate. This is achieved when at least one of the refractive index material layer and the low refractive index material layer is made of a transparent conductive material.

Further, according to the present invention, the object is to provide a screen, a light source, an ultraviolet-infrared cut filter, a liquid crystal panel, and a projection lens which are sequentially arranged on an optical axis toward the screen, and Infrared cut filter is a projection display device including a transparent substrate, and an optical multilayer film composed of a high refractive index material layer and a low refractive material layer alternately laminated on one surface of the transparent substrate, This is achieved by forming a transparent conductive material layer on the other surface of the transparent substrate.

According to the above arrangement, for example, the ultraviolet-infrared cut filter provided between the light source of the projection display device and the liquid crystal panel is provided with a high refractive index constituting the optical multilayer film formed on the surface of the transparent substrate. At least one of the material layer and the low refractive index material layer is made of a transparent conductive material, or the transparent conductive material layer is formed on any surface of the transparent substrate.

Therefore, while maintaining high transmittance in the visible light region by the optical multilayer film, and sharply cutting unnecessary ultraviolet and infrared light on both sides of the visible light region, the transparent conductive material layer forms infrared light in the long wavelength region. Heat can be suppressed by cutting the infrared rays in the long wavelength region, which is its drawback, with the transparent conductive material layer while taking advantage of the conventional reflection type ultraviolet / infrared cut filter. Become. This eliminates the necessity of installing a cooling fan in the projection display device, and reduces the number of components, thereby reducing costs and reducing the size.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The embodiment described below is a preferred specific example of the present invention, and thus various technically preferable limitations are added. However, the scope of the present invention particularly limits the present invention in the following description. The embodiment is not limited to these embodiments unless otherwise stated.

FIG. 1 and FIG. 2 show the configuration of a television set incorporating a projection type display device provided with an ultraviolet / infrared cut filter according to the present invention. 1 and 2, a television apparatus 10 is a rear projection type television apparatus of a liquid crystal system, and includes a cabinet 11 having an open front, a screen 12, a mirror 13, and a projection type arranged in the cabinet 11. And a display device 20.

The projection display device 13 is configured as shown in FIG. In FIG. 3, the projection type display device 2
Reference numeral 0 denotes a so-called three-panel type liquid crystal projector, which includes a light source 21, an ultraviolet / infrared cut filter 22, a multi-lens array 23, and a dichroic mirror 2 as a color separating means.
4r, 24b and reflection mirrors 25a, 25b, 25c,
25d, and liquid crystal panels 26r, 26g,
26b, a cross prism 27, and a projection lens 28.

As the light source 21, for example, a metal halide lamp or a halogen lamp is used. The ultraviolet / infrared cut filter 22 cuts ultraviolet light and infrared light of incident light from the light source 2 and transmits only visible light. The multi-lens array 23 has a known configuration, and in the illustrated case, two sets of multi-lens arrays are used to make the light intensity distribution of incident light uniform.

The dichroic mirrors 24r, 24b
Among them, the dichroic mirror 24r is configured to reflect red light and transmit blue light and green light, and the dichroic mirror 24b is configured to reflect blue light and transmit red light and green light. I have. As a result, with respect to the blue light, red light and green light that have been color-separated by the dichroic mirrors 24r and 24b, the red light passes through the reflection mirrors 25a and 25b, the green light directly passes through, and the blue light passes through the reflection mirror 25c. , 25d through the corresponding liquid crystal panels 26r, 26g, 26b.

The liquid crystal panels 26r, 26g, 26b
Is a known configuration, and is configured to display a pattern corresponding to an image by being driven and controlled by a drive circuit (not shown) based on an image signal corresponding to each color. The cross prism 27 has a known configuration, and transmits the light from the liquid crystal panel 26g and reflects the light from the liquid crystal panels 26r, 26b, thereby forming the liquid crystal panels 26r, 26g, 26b.
The light (video) from the camera is synthesized and output. The projection lens 28 is configured to receive an image synthesized by the cross prism 27 and form an image on the screen 12 via the mirror 13.

The above configuration is almost the same as that of the conventional three-panel type liquid crystal projector shown in FIG. 15, but the projection type display device 20 according to the embodiment of the present invention is different in the following points. Has become. That is, the ultraviolet / infrared cut filter 22 is configured as shown in FIG. Referring to FIG.
Is obtained by alternately stacking the high-refractive-index material layers 22b and the low-refractive-index material layers 22c on the surface of the transparent substrate 22a,
An optical multilayer film is formed, and one layer 22d (shown by oblique lines) of the low refractive index material layer is formed of a transparent conductive material.

The transparent substrate 22a is made of any material as long as it is transparent in the visible light region, and is preferably made of float glass or resin. The material of the high refractive index material layer 22b is, for example, TiO2 or Ta2O.
5, Nb2 O5 and the like are preferably used. The material of the low refractive index material layer 22c is, for example, SiO2 or ZrO2.
, MgF2 and the like are preferably used.

On the other hand, as the above-mentioned transparent conductive material, any material can be used as long as it has high electrical conductivity and is transparent, but the completeness of the manufacturing technology and the stability of the material itself can be used. For example, In2 O3 and S
ITO which is a solid solution of nO2, ZnO containing Al
(Zinc oxide) and the like are preferably used. The method for forming the high-refractive-index material layer 22b, the low-refractive-index material layer 22c, and the transparent conductive material layer on the surface of the transparent substrate is not particularly limited, and for example, a dry film forming method such as a vacuum evaporation method or a sputtering method, or a spray method. An arbitrary method such as a wet film forming method such as a wet coating method, a dipping method, and a flow coating method can be employed.

The television device 10 according to the present invention is configured as described above, and the projection display device 20 operates as follows. The light from the light source 21 is blocked by the ultraviolet-infrared cut filter 22 from the ultraviolet and infrared rays, only visible light is transmitted, and the light intensity distribution is made uniform by the multi-lens array 23. Then, the light is distributed by the dichroic mirrors 24r and 24b. The color-separated colors, that is, red light, green light, and blue light enter the liquid crystal panels 26r, 26g, and 26b, respectively.

Here, each of the liquid crystal panels 26r, 26g, 2
6b is controlled by a drive circuit (not shown) based on video signals corresponding to each color of the video to be displayed, so that the video of each color is transmitted through each of the liquid crystal panels 26r, 26g, 26b and the cross prism 27 Incident on
The images are synthesized as one color image and projected on the screen 12 via the projection lens 28 and the mirror 13.

Here, the ultraviolet / infrared cut filter 2
As described above, No. 2 has a configuration in which a transparent conductive material layer is added to a conventional reflection type ultraviolet / infrared cut filter having an optical multilayer film. As shown in FIG. 8, the transmittance of the transparent conductive material layer starts to decrease from 1000 nm, and the transmittance becomes almost 0% at 1500 nm or more. Therefore, most of the light of 1500 nm or more is reflected. Will be. This is because, generally, all electromagnetic waves having an energy lower than the plasma frequency determined by the free electron concentration are reflected, but this is because the plasma frequency of the transparent conductive material is in the range of just 1000 nm to 1500 nm. This is because light of lower energy, that is, light of a longer wavelength is reflected.

Accordingly, the spectral transmission characteristic of the ultraviolet / infrared cut filter 22 is obtained by superposing the spectral transmission characteristic A of the reflection type ultraviolet / infrared cut filter shown in FIG. 13 with the spectral transmission characteristic of the transparent conductive material layer shown in FIG. In addition, it is possible to effectively cut an infrared region in a long wavelength region while maintaining a high transmittance in a visible light region. This allows
The ultraviolet / infrared cut filter 22 can effectively reflect infrared rays in a long wavelength region of 1500 nm or more, which is a disadvantage thereof, while maintaining the advantages of the conventional reflection type ultraviolet / infrared cut filter. Note that the refractive index of the transparent conductive material is about 2.0, and the refractive index of the low refractive index material layer is about 1.38 to 1.5, so that a refractive index difference of 0.5 or more is obtained. By replacing the low refractive index material layer with a transparent conductive material, the effect of the optical multilayer film is not reduced.

FIGS. 5 to 7 show modified examples of the ultraviolet / infrared cut filter 22 described above. In FIG. 5, the ultraviolet-infrared cut filter 30 is provided on the surface of the transparent substrate 31.
By alternately stacking the high-refractive-index material layers 32 and the low-refractive-index material layers 33, an optical multilayer film is formed,
One layer 32a (shown by oblique lines) of the high refractive index material layer is made of a transparent conductive material. In FIG. 6, the ultraviolet-infrared cut filter 40 is formed by alternately stacking a high-refractive-index material layer 42 and a low-refractive-index material layer 43 on one surface (the upper surface in FIG. 6) of the transparent substrate 41. A transparent conductive material layer 44 is formed on the other surface (lower surface) of the transparent substrate 41 while constituting an optical multilayer film.

Further, in FIG. 7, an ultraviolet-infrared cut filter 50 has a transparent conductive material layer 52 formed on the surface of a transparent substrate 51 and a high-refractive-index material on the transparent conductive material layer 52. Layer 53 and low refractive index material layer 5
4 are alternately stacked to form an optical multilayer film. These ultraviolet and infrared cut filters 30, 40,
Reference numeral 50 denotes a configuration in which a transparent conductive material layer is added to a conventional reflection type ultraviolet / infrared cut filter having an optical multilayer film.
Has the same function as.

The specific evaluation of the ultraviolet / infrared cut filter 22 according to the present invention will be described below. First, the ultraviolet-infrared cut filter 22 sufficiently degreases and dries the surface of the transparent substrate 22a with isopropyl alcohol, ethanol, or the like, and then sets it in a vacuum evaporation machine or a sputtering apparatus, and evacuates to a predetermined degree of vacuum. After that, the high refractive index material layer 22b, the low refractive index material layer 22c, and the transparent conductive material layer are formed. In this case, the film forming conditions are appropriately selected. Then, the ultraviolet / infrared cut filter 22 manufactured as described above was set on the projection display device 20 shown in FIG. 3, and the temperature inside the device was measured.

First, as a first comparative example, a TiO2 film having a thickness of 52 nm and a 89 nm film thickness were formed on a float glass substrate surface.
A conventional reflection type ultraviolet / infrared cut filter 3a in which a total of 30 m.sup.2 SiO2 films are alternately laminated is set in the projection display device 20, the light source 21 is turned on, and the temperature in the device is measured one hour later. As a result, the temperature was 70 ° C. Next, as a second comparative example, one Fe element was added to the glass composition.
The conventional absorption type ultraviolet-infrared cut filter 3e to which the weight% was added was set in the projection type display device 20, the light source 21 was turned on, and the temperature in the device was measured one hour later. Had reached.

On the other hand, as a first embodiment, a 200 nm thick ITO layer was formed on the surface of a float glass substrate by sputtering, and a 73 nm thick TiO2 film was formed on this surface by vacuum evaporation. And film thickness 125n
By alternately stacking a total of 25 m 2 SiO 2 films,
An ultraviolet / infrared cut filter 50 was produced. The ultraviolet-infrared cut filter 50 was set in the projection display device 20, the light source 21 was turned on, and the temperature inside the device was measured one hour later.

As a second embodiment, a 300 nm-thick Al-containing Z
After the nO layer is formed by the sputtering method, the other surface of the float glass substrate is coated with a film thickness of 7 by the vacuum evaporation method.
An ultraviolet / infrared cut filter 40 was manufactured by alternately laminating a total of 30 layers of a 3 nm TiO2 film and a 125 nm thick SiO2 film. The ultraviolet-infrared cut filter 40 was set in the projection display device 20, the light source 21 was turned on, and the temperature in the device 1 hour later was measured. As a result, the temperature was 52 ° C.

Further, as a third embodiment, a film thickness of 88 mm was formed on the surface of the float glass substrate by sputtering.
An ultraviolet-infrared cut filter was manufactured by alternately laminating a total of 32 layers of an ITO film having a thickness of nm and a SiO2 film having a thickness of 125 nm. This ultraviolet-infrared cut filter is set in the projection display device 20, and the light source 21 is turned on.
One hour later, the temperature inside the device was measured and found to be 48.
° C.

As a fourth embodiment, a film thickness of 73 nm was formed on the surface of a float glass substrate by sputtering.
An ultraviolet-infrared cut filter was manufactured by alternately stacking a total of 32 TiO2 films and an Al-containing ZnO film having a thickness of 88 nm. The ultraviolet-infrared cut filter was set in the projection display device 20, the light source 21 was turned on, and the temperature inside the device was measured one hour later.

As described above, in each of the examples, a temperature significantly lower than the temperature in the two comparative examples is obtained, and the ultraviolet and infrared cut filters 22 and 3 according to the present invention are obtained.
The effects of 0, 40, and 50 were confirmed. In the above-described embodiment, the projection display device 20 is used as a display device for the television device 10, but is not limited thereto, and may be used for other purposes, such as a display device for presentation of a personal computer. Obviously gaining.

[0040]

As described above, according to the present invention, the transmittance in the visible light region is maintained high by the optical multilayer film, and unnecessary ultraviolet and infrared rays on both sides of the visible light region are sharply cut. By using the transparent conductive material layer, infrared rays in the long wavelength region can be cut.Thus, while taking advantage of the conventional reflection type ultraviolet / infrared cut filter, infrared rays in the long wavelength region, which is a drawback, can be cut by the transparent conductive material layer. By cutting, heat generation is suppressed. Accordingly, it is not necessary to install a cooling fan in the projection display device, and the number of components can be reduced, so that the cost can be reduced and the size can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a configuration of a television device incorporating an embodiment of a projection display device according to the present invention.

FIG. 2 is a schematic cross-sectional view of the television device of FIG.

FIG. 3 is an exemplary diagram showing a configuration of an embodiment of a projection display device used in the television device of FIG. 1;

FIG. 4 is a schematic cross-sectional view showing a first embodiment of an ultraviolet-infrared cut filter used in the projection type display device of FIG.

FIG. 5 is a schematic cross-sectional view showing a second embodiment of an ultraviolet-infrared cut filter used in the projection type display device of FIG.

FIG. 6 is a schematic sectional view showing a third embodiment of an ultraviolet-infrared cut filter used in the projection type display device of FIG. 3;

FIG. 7 is a schematic sectional view showing a fourth embodiment of an ultraviolet-infrared cut filter used in the projection type display device of FIG. 3;

FIG. 8 is a graph showing a spectral transmission characteristic of a transparent conductive material used in the ultraviolet and infrared cut filters of FIGS. 4 to 7;

FIG. 9 is a graph showing the spectral transmission characteristics of the ultraviolet and infrared cut filters of FIGS. 4 to 7;

FIG. 10 is a schematic diagram showing a configuration of a conventional projection display device.

11 is a schematic cross-sectional view showing a configuration of a reflection type ultraviolet-infrared cut filter used in the projection type display device of FIG.

FIG. 12 is a schematic cross-sectional view showing a configuration of an absorption type ultraviolet / infrared cut filter used in the projection type display device of FIG.

FIG. 13 is a graph showing the spectral transmission characteristics of the ultraviolet and infrared cut filters of FIGS. 11 and 12;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Television apparatus, 11 ... Cabinet, 12 ... Screen, 13 ... Mirror, 20.
..Projection display devices, 21 ... light sources, 22, 30, and 4
0,50: UV / IR cut filter, 22a, 3
1, 41, 51 ... transparent substrate, 22b, 32, 42,
53: High refractive index material layer, 22c, 33, 43, 54
... Low-refractive-index material layer, 22d, 32a, 44, 52
..Transparent conductive material layer, 23 ... multi-lens array,
24r, 24b ... dichroic mirror, 25a,
25b, 25c, 25d... Reflection mirror, 26r, 2
6g, 26b: liquid crystal panel, 27: cross prism, 28: projection lens

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Sugihara 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Koji Kita 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F term (reference) 2H048 GA04 GA15 GA33 GA52

Claims (7)

[Claims] 1. An ultraviolet / infrared cut filter comprising: a transparent substrate; and an optical multilayer film comprising a high refractive index material layer and a low refractive index material layer alternately laminated on the surface of the transparent substrate, An ultraviolet-infrared cut filter, wherein at least one of the refractive index material layer and the low refractive index material layer is made of a transparent conductive material. 2. The ultraviolet-infrared cut filter according to claim 1, wherein all the high refractive index material layers are made of a transparent conductive material. 3. The transparent conductive material is made of ITO or Al.
The ultraviolet / infrared cut filter according to claim 1, which is ZnO containing: 4. An ultraviolet-infrared cut filter comprising: a transparent substrate; and an optical multilayer film composed of a high-refractive-index material layer and a low-refractive-index material layer alternately laminated on one surface of the transparent substrate, An ultraviolet and infrared cut filter, wherein a transparent conductive material layer is formed on the other surface of the transparent substrate. 5. The transparent conductive material is made of ITO or Al.
The ultraviolet / infrared cut filter according to claim 4, which is ZnO containing: 6. A screen, comprising: a light source, an ultraviolet-infrared cut filter, a liquid crystal panel, and a projection lens which are sequentially arranged on an optical axis toward the screen, wherein the ultraviolet-infrared cut filter includes a transparent substrate, A projection display device comprising: an optical multilayer film composed of a high-refractive-index material layer and a low-refractive-index material layer alternately stacked on a surface of a transparent substrate, wherein the high-refractive-index material layer and the low-refractive-index material layer Wherein at least one layer is made of a transparent conductive material. 7. A screen, comprising: a light source, an ultraviolet-infrared cut filter, a liquid crystal panel, and a projection lens sequentially arranged on an optical axis toward the screen, wherein the ultraviolet-infrared cut filter includes a transparent substrate, A projection display device comprising: an optical multilayer film composed of a high-refractive-index material layer and a low-refractive-index material layer alternately laminated on one surface of a transparent substrate, wherein the other surface of the transparent substrate is transparent. A projection type display device, wherein a conductive material layer is formed.