JP2828451B2 - Liquid crystal projector, polarizer used for the same, and polarizing microscope using the polarizer - Google Patents

Description

The present invention relates to a liquid crystal projector that projects an image on a liquid crystal panel onto a screen by an optical system to obtain an enlarged image, a polarizer used for the projector, and a polarizer used therefor. Related to a polarizing microscope.

[Conventional technology]

2. Description of the Related Art As described in Japanese Patent Application Laid-Open Nos. 62-229117 and 61-140345, a conventional liquid crystal projector projects an image reproduced on a transmissive liquid crystal panel onto a screen using a projection lens. To obtain an enlarged image,
FIG. 10 shows an example of the configuration.

As shown in FIG. 10, the case 40 of the liquid crystal projector
Is provided with a transmissive liquid crystal panel 8 sandwiched between two polarizing plates 9 and a light source unit. The light source unit includes a lamp 1 and a concave mirror 2 that reflects light toward a liquid crystal panel 8. The light emitted from the lamp 1 is subjected to an infrared ray removing filter (an infrared ray reflecting filter or an infrared ray absorbing filter) 39 to remove an infrared ray component from the light.
Incident on. The light transmitted through the liquid crystal panel 8, that is, the display image of the liquid crystal panel 8 is condensed by the lens 7, projected on the screen 11 by the projection lens 10, and forms an enlarged image on the screen 11.

Such a liquid crystal projector apparatus is designed to enlarge and view an image on a small liquid crystal panel, and a large screen can be displayed with a small apparatus.

[Problems to be solved by the invention]

The conventional liquid crystal projector described above has the following problems.

That is, the polarizing plate 9 absorbs at least half of the visible light energy to obtain polarized light having a constant light vibration direction. Further, a lamp having a large rated power is used as the lamp 1 in order to secure the brightness of an image. Therefore,
As the temperature around the lamp 1 increases, the absolute value of the lamp luminous flux also increases, and the visible light energy absorbed by the polarizing plate (particularly, the polarizing plate located on the light source side) 9 increases. Rises and exceeds the allowable range, the shape of the polarizing plate 9 is deformed, the optical characteristics of the polarizing plate 9 are deteriorated, and the polarizing plate 9 becomes unusable, and the life of the polarizing plate 9 is shortened. Was.

In addition, since the polarizing plate 9 is generally used by being attached to the liquid crystal panel 8, the heat of the polarizing plate 9 is directly conducted to the liquid crystal panel 8, and the temperature of the liquid crystal panel 8 rises. As a result, there is a problem that the liquid crystal material in the liquid crystal panel 8 causes a malfunction due to the temperature rise, thereby deteriorating the quality of the reproduced image.

Furthermore, the polarizing plate 9 has an optical characteristic in which the degree of polarization is opposite to the light transmittance. Therefore, when a polarizing plate having a high degree of polarization is used as the polarizing plate 9, an image having a high contrast ratio can be obtained. On the other hand, the brightness of the image decreases, and conversely, when a polarizing plate having a high light transmittance is used, a bright image can be obtained, but the contrast ratio of the image decreases. Therefore, the contrast ratio is high,
In addition, it is difficult to obtain a bright image at the same time, and therefore, there is a problem that a design must be performed so that only one of them can be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to obtain a high contrast ratio and a bright image without shortening the life of a polarizing plate or deteriorating the quality of a reproduced image. It is an object of the present invention to provide a liquid crystal projector device that can perform the above-described operations.

[Means for solving the problem]

The above object is to remove the polarizing plate used on the light source side from the polarizing plates adhered to both sides of the liquid crystal panel, and instead coat the polarizing beam splitter film and the cold mirror film on both surfaces of the glass substrate, respectively. Achieved by blocking the infrared component contained in the incident light using a polarizer made of, and obtaining polarized light having a component whose vibration direction is constant from the incident light whose vibration direction is not constant, and irradiating the liquid crystal panel. Is done.

[Action]

The polarizing beam splitter film that constitutes the polarizer has a P polarization and a S polarization having a high degree of polarization from light in the visible region as compared with a polarizing plate.
Polarized light can be separated with almost no loss. Also, the light beam from which the infrared component has been removed by the cold mirror film is incident on the polarizing beam splitter film, and the polarized light is obtained without absorbing the energy of the incident light. It is small and has no problem in life.

As a result, the liquid crystal panel of the present liquid crystal projector is irradiated with a high degree of polarization and bright polarized light, and a bright reproduced image with a high contrast ratio can be obtained.
Since the temperature rise of the liquid crystal panel can be reduced, malfunction of the liquid crystal panel and deterioration of the quality of the reproduced image can be prevented.

〔Example〕

Hereinafter, a liquid crystal projector device will be described as an embodiment of the present invention.

FIG. 1 is a configuration diagram schematically showing a configuration of a liquid crystal projector device as one embodiment of the present invention.

The light beam emitted from the lamp 1 is converted into a lamp light 12 whose light flux is substantially parallel by the concave mirror 2 and the lens 3. The polarizer 16 is provided on both surfaces of the glass substrate 4 with the cold mirror film 5.
And the polarizing beam splitter film 6 are coated, and are arranged inclined with respect to the optical axis (not shown) of the lamp light 12 so that the lamp light 12 is incident at an angle of about 45 °.

Here, the cold mirror film 5 is formed by coating a multi-layered thin film on one surface of the glass substrate 4 by vapor deposition. Is an optical mirror that reflects light.

FIG. 2 shows an example of the light transmittance of the cold mirror film 5 and the spectral characteristics of the lamp light 12 incident on the cold mirror film 5 and the transmitted light transmitted through the cold mirror film 5 in FIG.

FIG. 2 shows the spectral characteristics of the halogen lamp light as the lamp light 12 incident on the cold mirror film 5.

The spectral characteristic of the lamp light 12 is a characteristic that monotonously increases in the wavelength region shown in FIG. 2, and most of the emitted energy is in the infrared region that does not contribute to the improvement of the brightness of the screen. Therefore, the cold mirror film 5 reflects the incident lamp light.
Of the 12, infrared rays that cause the temperature of the liquid crystal panel 8 to rise
13 is selectively reflected and transmits light in the visible range as it is.
Therefore, the spectral characteristics of the transmitted light transmitted through the cold mirror film 5 are such that the energy components of the light are only in the visible region, and the temperature rise of the liquid crystal panel 8 is reduced.

Next, the transmitted light in the visible region transmitted through the cold mirror film 5 is incident on the polarization beam splitter film 6.

Like the cold mirror film 5, the polarizing beam splitter film 6 is formed by coating a multi-layered thin film on the other surface of the glass substrate 4 by vapor deposition. It has a characteristic of selectively transmitting an electric vector (a component on the incident surface) and selectively reflecting S-polarized light (a component of which the electric vector of light is perpendicular to the incident surface).

FIG. 3 shows the polarization beam splitter film 6 shown in FIG.
1 shows an example of the spectral characteristics of FIG.

Since the polarizing plate 9 shown in FIG. 10 absorbs light of an unnecessary polarization component to obtain polarized light, when light having a high degree of polarization is to be obtained, the light transmittance is reduced. In the case of G1229DU polarizing plate manufactured by Denko, the degree of polarization was about 99% and the light transmittance was about 38%. About 62% of the incident light energy was absorbed and could not be used. . However, since the polarizing beam splitter film 6 obtains polarized light by interference between the thin films, as shown in FIG. 3, P-polarized light and S-polarized light each having an energy of about 49% of the incident light energy.
It can be separated into polarized light (polarization degree 98% or more).

As a result, in FIG. 1, when the lamp light 12 is incident on the polarizer 16, a bright and high-purity P-polarized light 15 in which an infrared component is cut off can be obtained as transmitted light, and the infrared light 13 and the S-polarized light 14 are reflected. Will be done.

Next, after the P-polarized light 15 is collected by the lens 7,
The amount of light transmitted through each pixel of the liquid crystal panel 8 is controlled by the liquid crystal panel 8 and the polarizing plate 9, and as a result, an image corresponding to a video signal is reproduced. A color image can be reproduced by using a color liquid crystal panel as the liquid crystal panel 8, and a monochrome image can be reproduced by using a monochrome liquid crystal panel.

The light transmitted through the liquid crystal panel 8 and the polarizing plate 9 is projected on a screen 11 by a projection lens 10 to form an enlarged image on the screen 11.

Next, FIG. 4 is a configuration diagram schematically showing a configuration of a liquid crystal projector device as another embodiment of the present invention.

4, the same components as those in FIG. 1 are denoted by the same reference numerals.

A cold filter film 20 is coated on the lamp-side surface of the lens 3 by depositing a multi-layered thin film. The cold filter film 20 is an optical filter that selectively reflects infrared light 13 by interference between thin films and selectively transmits visible light.

The light rays emitted from the lamp 1 and the light rays reflected by the concave mirror 2 are blocked by the cold filter film 20 so that the infrared rays 13 are cut off, and only visible light enters the lens 3 and is converted into substantially parallel light rays.

The polarizer 17 is formed by coating a polarization beam splitter film 6 on one surface of a glass substrate 4. The polarization beam splitter film 6 selectively reflects S-polarized light 14 from incident visible light and selectively reflects P-polarized light 15 from the visible light. Through.

The green filter 24 transmits green light (for example, light having a wavelength in the range of 500 nm to 580 nm) from the incident P-polarized light 15 and blocks light in other wavelength ranges. The green P-polarized light 15 transmitted through the green filter 24 is condensed by the lens 7 so as to be substantially parallel light, and then is polarized by the monochrome liquid crystal panel 21 driven by a green primary color signal obtained from a color video signal. The plate 9 is irradiated with a monochrome liquid crystal panel 21
Play the green image on top.

On the other hand, the S-polarized light 14 reflected by the polarization beam splitter film 6 has its optical path bent by a reflection mirror 23 'and is condensed by a lens 7' so as to become almost parallel rays. ′.

The liquid crystal panel 22 is a two-color R / B color liquid crystal panel incorporating two color filters of red (R) and blue (B), and is driven by a red primary color signal and a blue primary color signal obtained from a color video signal. , For reproducing red and blue images.

The dichroic mirror 25 is an optical mirror that is formed by coating a multi-layer thin film, reflects green light by interference between thin films, and transmits red light and blue light.

The green light transmitted through the monochrome liquid crystal panel 21 and the optical path of which is bent by the reflection mirror 23, and the red light and the blue light transmitted through the R / B two-color liquid crystal panel 22 are dichroic mirrors 25.
After that, the image is projected on a screen 11 by a single projection lens 10 and enlarged on the screen 11 to form a full-color image.

In the present embodiment, a high-resolution image substantially equivalent to a conventional liquid crystal projector device using three liquid crystal panels that respectively display images of three primary colors of red, green, and blue is displayed on two liquid crystal panels. By using this method, the manufacturing cost of the liquid crystal projector can be reduced. That is, in the present embodiment, in order to realize a high-resolution image using two liquid crystal panels, a sufficient resolution is ensured for a green image having high visibility (sensitivity to human eyes). For the red and blue images having lower visibility than the green image using the monochrome liquid crystal panel 21, it is only necessary to secure a certain degree of resolution. An R / B two-color liquid crystal panel 22 having only half the number of dots is used.

FIG. 5 is a configuration diagram schematically showing a configuration of a liquid crystal projector device as another embodiment of the present invention.

In this embodiment, two monochrome liquid crystal panels
The use of 21, 21 'achieves high definition of an image.

In FIG. 5, the same components as those in FIG. 1 are denoted by the same reference numerals.

As shown in FIG. 5, of the light emitted from the lamp 1, the infrared light 13 and the S-polarized light 14 are reflected by the polarizer 16, and the P-polarized light 15 in the visible region is transmitted. The P-polarized light 15 transmitted through the polarizer 16 is condensed by the lens 7 and then irradiated to the monochrome liquid crystal panel 21, and the light transmitted through the monochrome liquid crystal panel 21 and the polarizing plate 9 is transmitted to the screen 11 by the projection lens 10. The projected and enlarged image is formed on the screen 11.

On the other hand, the infrared light 13 reflected by the polarizer 16 and the S-polarized light
14 has its optical path bent by the reflection mirror 23 'and enters the lens 7'. Then, the infrared light 13 is reflected by the cold filter film 20 coated on the surface of the lens 7 ', and only the visible S-polarized light 14 reaches the monochrome liquid crystal panel 21'. The light transmitted through the monochrome liquid crystal panel 21 'and the polarizing plate 9' is projected on the screen 11 by the projection lens 10 'to form an enlarged image on the screen 11.

Therefore, on the screen 11, the monochrome liquid crystal panel
Since the images of the liquid crystal panel 21 and the monochrome liquid crystal panel 21 'are combined into one image, a high-definition image having twice the number of dots can be reproduced as compared with the case where one liquid crystal panel is used. Furthermore, since one image is obtained by optically synthesizing the images of the two liquid crystal panels on the screen 11, the joint between the images of the two liquid crystal panels on the screen 11 can be easily made inconspicuous. be able to.

Although description is omitted, a screen is formed by using a plurality of the liquid crystal projector devices shown in FIGS. 1, 4 and 5.
Needless to say, a large-screen and high-definition image can be displayed also by synthesizing the image on the screen 11.

FIG. 6 is a configuration diagram schematically showing a configuration of a liquid crystal projector device as still another embodiment of the present invention.

In this embodiment, a stereoscopic image is displayed using two liquid crystal panels 26 and 27.

In FIG. 6, the same components as those in FIG. 4 are denoted by the same reference numerals.

A cold filter film 20 is coated on the surface of the lens 3 on the side of the lamp 1 by depositing a multi-layered thin film.

In the light emitted from the lamp 1 and the light reflected by the concave mirror 2, the infrared light 13 is reflected by the cold filter film 20, and the light transmitted through the lens 3 is only visible light from which the infrared component has been removed.

The light transmitted through the lens 3 becomes substantially parallel light, and is incident on a polarizer 17 formed by coating one surface of a glass substrate 4 with a polarizing beam splitter film 6. The polarization beam splitter film 6 selectively reflects the S-polarized light 14 from the incident non-polarized visible light and selectively transmits the P-polarized light 15.

The P-polarized light 15 is condensed by the lens 7 so as to become almost parallel rays, and then is irradiated to the liquid crystal panel 26 for the right eye. At this time, the right-eye liquid crystal panel 26 is driven by the right-eye video signal, and displays a right-eye image. On the other hand, the S-polarized light 14 has its optical path turned back by the reflection mirror 23 ', and is condensed by the lens 7' so as to become almost parallel rays, and then is irradiated to the liquid crystal panel 27 for the left eye. At this time, the liquid crystal panel 27 for the left eye is driven by the video signal for the left eye, and displays an image for the left eye. The light path of the S-polarized light 14 emitted from the left-eye liquid crystal panel 27 is turned back by the reflection mirror 23 ″.
The light enters the polarizer 30.

The polarizer 30 is formed by alternately coating a polarizer film made of a dielectric multilayer film and a stack film as a dielectric film 29 on one surface of a glass substrate 28, and is arranged so that the emission angle becomes substantially the Brewster angle. Then, it selectively reflects S-polarized light (the stack film totally reflects S-polarized light) and selectively transmits P-polarized light. Further, an anti-reflection film for preventing reflection of P-polarized light is added between the stack film and the glass substrate 28 and between the stack film and air, and as a result, the transmittance of P-polarized light is reduced. The reflectance of S-polarized light is increased to 95% or more and 99% or more. The stack film is
For example, TiO ₂ (n ≒ 2.2), SiO ₂ (n ≒) having different refractive indexes n
1.5) is formed by coating about 20 to 30 layers.

Therefore, the P-polarized light 15 emitted from the right-eye liquid crystal panel 26
Transmits through the polarizer 30 without being reflected by the polarizer 30, and
The S-polarized light 14 emitted from the liquid crystal panel 27 for the left eye and whose optical path is turned back by the reflection mirror 23 "is reflected by the polarizer 30. As a result, the P-polarized light 15 and the S-polarized light 14 are combined into a single light. The image is projected onto the screen 11 by the projection lens 10 and forms enlarged images for the right eye and the left eye on the screen 11, respectively.

Although the image on the screen 11 cannot be viewed as it is, the stereoscopic image can be viewed by using the polarized glasses 31.

The polarizing glasses 31 use a polarizing plate for transmitting P-polarized light and blocking S-polarized light for the right eye portion, and a polarizing plate for transmitting S-polarized light and blocking P-polarized light for the left eye portion. Therefore,
By using the polarized glasses 31, only the P-polarized light 15 for displaying the image for the right eye reaches the right eye, and only the S-polarized light 14 for displaying the image for the left eye reaches the left eye. Images can be played.

Next, a polarizer used in the liquid crystal projector shown in FIG. 1 or 5 will be described as an embodiment of the present invention.

FIG. 7 is a sectional view showing a section of a polarizer as one embodiment of the present invention.

The polarizer 18 shown in FIG. 7 is used as a substitute for the polarizer 16 shown in FIG. 1 or FIG. 5. First, the inclined surface of the right-angle prism 32 is coated with the polarizing beam splitter film 6, and then, Right angle prism 32 and another right angle prism 3
The polarizing beam splitter prism is formed by bonding 2 'and 2' so that their inclined surfaces face each other, and the cold filter film 20 is coated on the incident surface of the polarizing beam splitter prism.

The lamp light 12 incident on the polarizer 18 is a cold filter film.
The infrared light 13 is reflected by 20, and only the visible light is reflected by the polarizer 18.
And reaches the polarizing beam splitter film 6. Then, P-polarized light in the visible region is generated by the polarizing beam splitter film.
15 and S-polarized light 14.

FIG. 8 is a cross-sectional view showing a cross section of a polarizer as another embodiment of the present invention.

A polarizer 19 shown in FIG. 8 is also used in place of the polarizer 16 shown in FIG. 1 or FIG. 5, and a glass substrate 4 having a surface coated with a cold mirror film 5;
It is formed by bonding a glass substrate 4 ′ with a polarizing beam splitter film 6 coated on the surface thereof.

Next, as an embodiment of the present invention, the polarizer shown in FIG.
A polarization microscope using 18 will be described.

FIG. 9 is a configuration diagram schematically showing a configuration of a polarization microscope as one embodiment of the present invention.

The polarization microscope shown in FIG. 9 is used for observing rocks, minerals, etc., and uses the polarizer 18 shown in FIG.

The light emitted from the lamp 1 and the light reflected by the concave mirror 2 are converted into parallel light by the lens 3 and enter the polarizer 18. Then, the S-polarized light 14, which is emitted from the polarizer 18 and whose infrared rays are blocked, is condensed by the lens 7 and irradiates the object 34 on the stage 33. And
An enlarged image of the observed object 34 is obtained by the objective lens 35 and the eyepiece 37 provided in the lens barrel 38.

In addition, since the analyzer 36 made of a rotatable polarizing plate is arranged in the middle part of the lens barrel 38, it is possible to change the observation state by rotating the analyzer 36, and it is used as a polarizing microscope. it can.

According to this embodiment, an optical element for blocking infrared rays and an optical element for obtaining linearly polarized light, which are separate in the conventional polarizing microscope, are configured as one polarizer as the polarizer 18. The number of parts is small,
Cost can be reduced.

〔The invention's effect〕

According to the present invention, in the conventional liquid crystal projector, the polarizing plate disposed on the light source side of the liquid crystal panel can be omitted.

Accordingly, the life of the polarizing plate is shortened due to the temperature rise of the polarizing plate, so that the life of the liquid crystal projector is not shortened.

In addition, the temperature rise of the liquid crystal panel due to the temperature rise of the polarizing plate is also eliminated, and the infrared light is blocked by the polarizer disposed between the light source and the liquid crystal panel, so that the temperature rise of the liquid crystal panel is further suppressed, Therefore, the liquid crystal material in the liquid crystal panel does not malfunction and degrade the quality of the reproduced image.

Further, the beam splitter film constituting the polarizer disposed between the light source and the liquid crystal panel has a high degree of polarization and a high light transmittance, so that a high contrast ratio and a bright image can be obtained.

Further, even when a plurality of liquid crystal panels are used, the light from the light source can be efficiently irradiated to them, so that a large-screen, high-quality liquid crystal projector can be easily realized at low cost.

When a right-eye liquid crystal panel and a left-eye liquid crystal panel are used, the right-eye image and the left-eye image can be easily separated by a polarizer disposed between the light source and the liquid crystal panel. Images can be easily reproduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the configuration of a liquid crystal projector device as one embodiment of the present invention, and FIG. 2 is a light transmittance of a cold mirror film in FIG. 1 and a lamp incident on the cold mirror film. FIG. 3 is a characteristic diagram showing an example of spectral characteristics of light and transmitted light transmitted through the cold mirror film, and FIG.
FIG. 4 is a characteristic diagram showing an example of the spectral characteristics of the polarization beam splitter film in FIG. 1, FIG. 4 is a configuration diagram schematically showing a configuration of a liquid crystal projector device as another embodiment of the present invention, and FIG. Is a configuration diagram schematically showing the configuration of a liquid crystal projector device as another embodiment of the present invention, and FIG. 6 is a configuration diagram schematically showing the configuration of a liquid crystal projector device as still another embodiment of the present invention. FIG. 7, FIG. 7 is a cross-sectional view showing a cross section of a polarizer as one embodiment of the present invention, FIG. 8 is a cross-sectional view showing a cross section of a polarizer as another embodiment of the present invention, and FIG. FIG. 10 is a configuration diagram schematically showing a configuration of a polarization microscope as one embodiment of the present invention, and FIG. 10 is a configuration diagram schematically showing a configuration of a conventional liquid crystal projector device. DESCRIPTION OF SYMBOLS 1 ... Lamp, 3,7 ... Lens, 4 ... Glass substrate, 5
…… Cold mirror film, 6 …… Polarized beam slitter film,
8 ... liquid crystal panel, 9 ... polarizing plate, 10 ... projection lens,
11 ... Screen.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G09F 9/00 360,331 G02B 27/28

Claims (11)

(57) [Claims] 1. A light source comprising at least a light source, a condensing optical system, a liquid crystal panel, a dosing lens, and a screen.
Irradiating the liquid crystal panel, projecting the light beam transmitted through the liquid crystal panel on the screen by the administration lens,
In a liquid crystal projector device for enlarging and forming an image displayed on the liquid crystal panel on the screen, a first optical thin film that cuts off infrared rays and transmits only visible light among incident light rays is incident. A second optical thin film for obtaining a linearly polarized light beam having a specific polarization plane from the unpolarized light beam is formed in the same optical element as a polarizer in the optical path of the light beam from the light source to the liquid crystal panel. A liquid crystal projector device provided in: 2. A light source comprising at least a light source, a condensing optical system, a liquid crystal panel, a dispensing lens, and a screen.
Irradiating the liquid crystal panel, projecting the light beam transmitted through the liquid crystal panel on the screen by the administration lens,
In a liquid crystal projector device for enlarging an image displayed on the liquid crystal panel on the screen to form an image, a cold mirror film that reflects infrared light and transmits visible light among incident light beams is formed on one of the glass substrates. A polarizer comprising coating the other surface of the glass substrate with a polarizing beam splitter film that coats an unpolarized light beam into two linearly polarized light beams whose polarization planes are orthogonal to each other. A liquid crystal projector device provided in an optical path of a light beam from a light source to the liquid crystal panel. 3. A light source comprising at least a light source, a condensing optical system, a liquid crystal panel, a dosing lens, and a screen.
Irradiating the liquid crystal panel, projecting the light beam transmitted through the liquid crystal panel on the screen by the administration lens,
A liquid crystal projector device for enlarging an image displayed on the liquid crystal panel on the screen and forming an image on the screen, wherein a cold mirror film that reflects infrared light and transmits visible light among incident light beams is provided on a first glass substrate. Coating on one side of the second glass substrate with a polarizing beam splitter film that splits the incident unpolarized light beam into two linearly polarized light beams whose polarization planes are orthogonal to each other. A liquid crystal projector device, wherein a polarizer formed by bonding first and second glass substrates is provided in an optical path of a light beam from the light source to the liquid crystal panel. 4. It comprises at least a light source, a condensing optical system, a liquid crystal panel, a dosing lens and a screen, and after condensing a light beam emitted from said light source by said condensing optical system,
Irradiating the liquid crystal panel, projecting the light beam transmitted through the liquid crystal panel on the screen by the administration lens,
A liquid crystal projector device for enlarging and forming an image displayed on the liquid crystal panel on the screen, wherein a cold filter film that reflects infrared light and transmits visible light among incident light beams is provided by a first right-angle prism. A polarizing beam splitter film that coats at least one surface other than the inclined surface and splits an incident unpolarized light beam into two linearly polarized light beams whose polarization planes are orthogonal to each other. An optical path of a light beam from the light source to the liquid crystal panel, comprising a polarizer formed by coating a slope of at least one of the right-angle prisms and bonding the first and second right-angle prisms with the slopes facing each other. A liquid crystal projector device provided inside. 5. A light source comprising at least a light source, a condensing optical system, a liquid crystal panel, a dosing lens, and a screen.
Irradiating the liquid crystal panel, projecting the light beam transmitted through the liquid crystal panel on the screen by the administration lens,
In a liquid crystal projector device for enlarging and forming an image displayed on the liquid crystal panel on the screen, at least one of the optical elements constituting the condensing optical system includes an infrared ray among incident light rays. And a first optical element formed by coating a cold filter film that reflects visible light and transmits visible light, and splits an incident unpolarized light beam into two linearly polarized light beams whose polarization planes are orthogonal to each other. A liquid crystal projector device comprising a polarizer formed by coating a polarizing beam splitter film on a second optical element, in a light path of a light beam from the light source to the liquid crystal panel. 6. A liquid crystal projector device according to claim 2, wherein said liquid crystal panel is constituted by a plurality of liquid crystal panels, and two linear lines whose polarization planes obtained by said polarizer are orthogonal to each other. Each of the polarized light beams is irradiated on at least one or more different liquid crystal panels, and the light beams transmitted through each of the liquid crystal panels are combined and projected onto the screen by the projection lens after the synthesis, or as such separately by the projection lens. A liquid crystal projector device that projects onto a screen. 7. The liquid crystal projector according to claim 2, wherein the liquid crystal panel is driven by a right eye liquid crystal panel driven by a right eye video signal and a left eye video signal. And the right-eye liquid crystal panel is irradiated with one of the two linearly polarized light beams whose polarization planes obtained by the polarizer are orthogonal to each other. Irradiating the liquid crystal panel for the left eye with a light ray, and combining the light rays transmitted through the liquid crystal panel and projecting it on the screen by the projection lens after the synthesis, or projecting the light beam on the screen separately by the projection lens as it is. Characteristic liquid crystal projector device. 8. A cold mirror film, which reflects infrared light and transmits visible light among incident light rays, is coated on one surface of a glass substrate, and the incident non-polarized light rays are reflected at a polarization plane orthogonal to each other. A polarizer comprising a polarizing beam splitter film that branches into two linearly polarized light beams, coated on the other surface of the glass substrate. 9. A cold mirror film, which reflects infrared light and transmits visible light among incident light rays, is coated on one surface of the first glass substrate, and the incident non-polarized light rays are polarized with respect to each other. A polarizer, comprising: a polarizing beam splitter film that branches into two orthogonal linearly polarized light beams, coated on one surface of a second glass substrate, and the first and second glass substrates are bonded to each other. . 10. A cold filter film that reflects infrared light and transmits visible light among the incident light beams is coated on at least one surface other than the inclined surface of the first right-angle prism, and the incident non-polarized light beams are applied. A polarizing beam splitter film that divides into two linearly polarized light beams whose polarization planes are orthogonal to each other is coated on an inclined surface of at least one of the first right-angle prism and the second right-angle prism, and A polarizer comprising a second right-angle prism bonded to an inclined surface facing each other. 11. A polarizing microscope using the polarizer according to claim 8, 9, or 10.