JPH02150886A - Liquid crystal projector device, polarizer used for same, and polarizing microscope using polarizer - Google Patents

Abstract

PURPOSE:To obtain a bright image with a high contrast ratio without shortening the life of a polarizing plate nor deteriorating the quality of a reproduced image by using the polarizer which is constituted by coating both surfaces of a glass substrate with a polarization beam splitter film and a cold mirror film. CONSTITUTION:The polarization beam splitter film 6 which constitutes the polarizer 16 separates visible light into P-polarized light and S-polarized light which are high in the degree of polarization than a polarizing plate 9 almost without any loss. Further, a light beam after infrared-ray components are removed by the cold mirror film 5 is made incident on the polarization beam splitter film 6 to obtain the polarized light without absorbing the energy of the incident light. The temperature rise of the polarization beams splitter film 6 is small and there is no problem of life. Consequently, a liquid crystal panel is irradiated with bright polarized light which is high in the degree of polarization to obtain the bright reproduced image with the high contrast ratio. Further, the temperature rise of the liquid crystal panel can be reduced, so the malfunction of the liquid crystal cell and the quality deterioration of the reproduced image are prevented.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a liquid crystal projector that projects an image on a liquid crystal panel onto a screen using an optical system to obtain an enlarged image;
The present invention relates to a polarizer used therein and a polarizing microscope using the polarizer.

[Conventional technology]

The conventional liquid crystal projector device is disclosed in Japanese Patent Application Laid-Open No. 62-2291.
As described in Publication No. 17 and Japanese Utility Model Application Publication No. 61-140345, an enlarged image is obtained by projecting an image reproduced on a transmissive liquid crystal panel onto a screen using a projection lens. Figure 10 shows an example of its configuration.

As shown in Figure 10, case 4 of the liquid crystal projector device
Inside the device 0, a transmissive liquid crystal panel 8 sandwiched between two polarizing plates 9 and a light source section are provided. The light source section consists of a lamp 1 and a concave mirror 2 that reflects light toward a liquid crystal panel 8. The light beam emitted from the lamp 1 has its infrared component removed by an infrared removal filter (infrared reflection filter or infrared absorption filter) 39, and then enters the liquid crystal panel 8. The light beam transmitted through the liquid crystal panel 8, that is, the display image of the liquid crystal panel 8, is condensed by the lens 7, and projected onto the screen 11 by the projection lens 10 to form an enlarged image on the screen 11.

Such a liquid crystal projector device is designed to greatly enlarge an image on a small liquid crystal panel for viewing, and it is possible to display a large screen size with a small device.

[Problem to be solved by the invention]

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

That is, the polarizing plate 9 absorbs more than half of the visible light energy to obtain polarized light whose vibration direction is constant. Also,
As the lamp 1, a lamp with a large rated power is used to ensure the brightness of the image. Therefore, the temperature around the lamp 1 becomes high, and the absolute value of the lamp luminous flux also becomes large.
As the visible light energy absorbed by the polarizing plate 9 increases, the temperature of the polarizing plate 9 rises and exceeds the allowable range, causing the shape of the polarizing plate 9 to deform and the optical properties of the polarizing plate 9 to deteriorate. There was a problem that the polarizing plate 9 became unusable and the life of the polarizing plate 9 was shortened.

In addition, since the polarizing plate 9 is usually used by pasting it on the liquid crystal panel 8, the heat of the polarizing plate 9 is directly applied to the liquid crystal panel 8.
As a result, the liquid crystal material in the liquid crystal panel 8 malfunctions due to the temperature rise, resulting in a problem that the quality of reproduced images deteriorates.

Furthermore, as for the optical properties of the polarizing plate 9, the degree of polarization and the light transmittance are in a contradictory relationship, so if a polarizing plate with a high degree of polarization is used as the polarizing plate 9, an image with a high contrast ratio can be obtained. On the other hand, the brightness of the image decreases, and conversely, when a polarizing plate with high light transmittance is used, although a bright image can be obtained, the contrast ratio of the image decreases. For this reason, it is difficult to simultaneously obtain an image with a high contrast ratio and a bright image, and therefore, there is a problem in that a design must be made in which only one or the other can be obtained.

The purpose of the present invention is to solve the problems of the prior art described above,
An object of the present invention is to provide a liquid crystal projector device capable of obtaining a bright image with a high contrast ratio without shortening the life of a polarizing plate or deteriorating the quality of a reproduced image.

(Means for solving the problem) The above purpose is to remove the polarizing plate used on the light source side from among the polarizing plates attached to both sides of the liquid crystal panel, and replace it with a polarizing beam splitter film and a cold mirror film. By using a polarizer formed by coating both sides of a glass substrate, the infrared component contained in the incident light is blocked, and the vibration direction of the incident light is not constant, and the vibration direction of the component is constant. By irradiating the liquid crystal panel,
achieved.

[Effect]

The polarizing beam splitter film constituting the polarizer can separate P-polarized light and S-polarized light with a high degree of polarization from light in the visible range with almost no loss, compared to a polarizing plate. In addition, the polarizing beam splitter film receives light from which infrared components have been removed by the cold mirror film, and obtains polarized light without absorbing the energy of the incident light, so the temperature of the polarizing beam splitter film does not rise. It is small and there are no problems with its lifespan.

As a result, the liquid crystal panel of this liquid crystal projector device is irradiated with bright polarized light with a high degree of polarization, making it possible to obtain a bright reproduced image with a high contrast ratio, and also to reduce the temperature rise of the liquid crystal panel. It is possible to prevent panel malfunctions and quality deterioration of reproduced images.

〔Example〕

A liquid crystal projector device will be described below as an embodiment of the present invention.

FIG. 1 is a block diagram schematically showing the structure of a liquid crystal projector device as an embodiment of the present invention.

The light beam emitted from the lamp 1 passes through the concave mirror 2. The lens 3 turns the luminous flux into substantially parallel lamp light 12. The polarizer 16 is formed by coating both surfaces of the glass substrate 4 with a cold mirror film 5 and a polarizing beam splitter film 6, and divides the light of the lamp light 12 so that the lamp light 12 is incident at an angle of about 45°. It is arranged at an angle with respect to an axis (not shown).

Here, the cold mirror film 5 is coated by depositing multiple layers of thin films on one surface of the glass substrate 4, and transmits light in the visible range due to interference between the thin films, and transmits light in the long wavelength infrared range. , %%13.

FIG. 2 shows an example of the light transmittance of the cold mirror film 5 in FIG. 1, 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, respectively.

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

The spectral characteristics of the lamp light 12 are monotonically increasing in the wavelength range shown in FIG. 2, and most of the emitted energy is in the infrared region, which does not contribute to improving the brightness of the screen. Therefore, the cold mirror film 5 is exposed to the incident lamp light 1.
2, it selectively reflects infrared rays 13, which cause an increase in the temperature of the liquid crystal panel 8, and transmits visible light as is. Therefore, in the spectral characteristics of the transmitted light transmitted through the cold mirror film 5, the energy component of the light is only in the visible range, thereby reducing the temperature rise of the liquid crystal panel 8.

Next, the transmitted light in the visible range that has passed through the cold mirror film 5 enters the polarizing beam splitter film 6.

The polarizing beam splitter film 6, like the cold mirror film 5 described above, is coated by depositing multiple layers of thin films on the other surface of the glass substrate 4, and polarized light (polarized light) is generated by interference between the thin films. It has the property of selectively transmitting S-polarized light (component whose electric vector is perpendicular to the plane of incidence) and selectively reflecting S-polarized light (component whose electric vector is perpendicular to the plane of incidence).

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

Since the polarizing plate 9 shown in FIG. 10 obtains polarized light by absorbing unnecessary polarized light components, when trying to obtain light with a high degree of polarization, the light transmittance decreases. Electrician ■
In the case of the polarizing plate G1229DU made by
The light transmittance is about 38%, which is about 62% of the incident light energy.
% had been absorbed and could not be used. However, since the polarizing beam splitter film 6 obtains polarized light through interference between thin films, as shown in FIG.
The incident light can be separated into P-polarized light and S-polarized light (degree of polarization of 98% or more), each having approximately 49% of the energy of the incident light.

After all, in FIG. 1, when the lamp light 12 is incident on the polarizer 16, bright and highly pure P-polarized light 15 with infrared components blocked can be obtained as the transmitted light, and the infrared 1
3 and S polarized light 14 are reflected.

Next, after the P-polarized light 15 is focused 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 according to the video signal is reproduced.

Note that if a color liquid crystal panel is used as the liquid crystal panel 8, a color image can be reproduced, and if a monochrome liquid crystal panel is used, a monochrome image can be reproduced.

LCD panel 8. The light transmitted through the polarizing plate 9 is transmitted to the projection lens 10.
The image is projected onto the screen 11 and an enlarged image is formed on the screen 11.

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

In FIG. 4, the same parts as in FIG. 1 are given the same reference numerals.

The lamp-side surface of the lens 3 is coated with a cold filter film 20 by depositing multiple thin films. The cold filter film 2° is an optical filter that selectively reflects infrared rays 13 and selectively transmits visible light through interference between thin films.

In the light beams emitted from the lamp 1 and the light beams reflected by the concave mirror 2, infrared rays 13 are blocked by the cold filter film 20, and only visible light enters the lens 3, where it is converted into nearly parallel light beams.

The polarizer 17 is formed by coating one side of the glass substrate 4 with a polarizing beam splitter film 6, and the polarizing beam splitter film 6 selectively reflects the S-polarized light 14 and selectively reflects the P-polarized light 15 from the incident visible light. Transparent to.

The green filter 24 transmits green light (for example, light in the wavelength 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 that has passed through the green filter 24 is focused by the lens 7 into almost parallel light beams, and then is sent to the monochrome liquid crystal panel 21 driven by the green primary color signal obtained from the color video signal and the polarized light. The light is irradiated onto the plate 9, and a green image is reproduced on the monochrome liquid crystal panel 21.

On the other hand, the S reflected by the polarizing beam splitter film 6
The optical path of the polarized light 14 is bent by a reflecting mirror 23', and after being condensed into a substantially parallel beam by a lens 7', the polarized light 14 is sent to a liquid crystal panel 22. The light is irradiated onto the polarizing plate 9'.

The liquid crystal panel 22 is an R/82 color liquid crystal panel with a built-in two-color filter 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. , which reproduces red and blue images.

The dichroic mirror 25 is coated with multiple layers of thin films, and is an optical mirror that reflects green light and transmits red and blue light through interference between the thin films.

The green light that has passed through the monochrome liquid crystal panel 21 and whose optical path has been bent by the reflection mirror 23 and the red and blue lights that have passed through the R/82 color liquid crystal panel 22 are combined by the dichroic mirror 25 and then combined into a single light. Projection lens 1
0 onto screen ll and screen 1
An enlarged full-color image is formed on 1.

In this example, a conventional liquid crystal projector device that uses three liquid crystal panels that display images in the three primary colors of red, green, and blue, and a high-resolution image that is equivalent to that of a conventional liquid crystal projector device that uses two liquid crystal panels to display images of the three primary colors of red, green, and blue. The manufacturing cost of the liquid crystal projector device can be reduced by realizing this using the following method. That is, in this embodiment, in order to realize a high-resolution image using two liquid crystal panels, sufficient resolution is ensured for the green image, which has high visibility (sensitivity of the human eye). , the monochrome liquid crystal panel 21 is used, and for red and blue images, which have lower visibility than green images, it is sufficient to ensure a certain level of resolution. An R/82 color liquid crystal panel 22 having only half the number of dots is used.

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

In this embodiment, two monochrome liquid crystal panels 2
1.21' is used to achieve high definition images.

In FIG. 5, the same parts as in FIG. 1 are given the same reference numerals.

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

On the other hand, the infrared rays 13 and S-polarized light 14 reflected by the polarizer 16 have their optical paths bent by the reflecting mirror 23'.
The light enters the lens 7'. The infrared rays 13 are reflected by the cold filter film 20 coated on the surface of the lens 7', and only the S-polarized light 14 in the visible range reaches the monochrome liquid crystal panel 21'. The light transmitted through the monochrome liquid crystal panel 21' and the polarizing plate 9' is sent to the projection lens 1.
0' onto the screen 11 to form an enlarged image on the screen 11.

Therefore, on the screen 11, the images of the monochrome liquid crystal panel 21 and the monochrome liquid crystal panel 21' are combined into one image, so compared to the case where one liquid crystal panel is used, a high-quality image with twice the number of dots is displayed. You can play detailed images. Furthermore, since the images of two liquid crystal panels are optically combined on the screen II to obtain one image,
On the screen 11, the joint between the images of the two liquid crystal panels can be easily made inconspicuous.

Although explanations are omitted, a screen can be created using a plurality of liquid crystal projector devices shown in FIGS.
It goes without saying that by combining images on a large screen, a high-definition image can be displayed on a large screen.

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

In this embodiment, two liquid crystal panels 26 and 27 are used to display a stereoscopic image.

In FIG. 6, the same parts as in FIG. 4 are given the same reference numerals.

The surface of the lens 3 on the lamp 1 side is coated with cold filters 11 and 20 by depositing multiple thin films.

The infrared rays 13 of the light emitted from the lamp 1 and the light rays reflected by the concave mirror 2 are reflected by the cold filter film 2o, and the light that passes through the lens 3 is only visible light with the infrared component removed.

The light transmitted through the lens 3 becomes a substantially parallel beam and is incident on a polarizer 17 formed by coating one side of a glass substrate 4 with a polarizing beam splitter film 6.

The polarizing beam splitter film 6 selectively reflects the S-polarized light 14 from the incident unpolarized visible light and selectively transmits the P-polarized light 15.

The P-polarized light 15 is focused by the lens 7 into a substantially parallel light beam, and then is irradiated onto the right eye liquid crystal panel 26 .

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 optical path of the S-polarized light 14 is turned back by the reflecting mirror 23',
After the light is condensed into substantially parallel light by the lens 7', it is irradiated onto the left eye liquid crystal panel 27. At this time, the left eye liquid crystal panel 27 is driven by the left eye video signal and displays a left eye image. Left eye LCD panel 2
The S-polarized light 14 emitted from the polarizer 7 has its optical path turned back by the reflecting mirror 23'' and enters the polarizer 30.

The polarizer 30 has a dielectric film 29 on one side of the glass substrate 28.
It is constructed by alternately coating a polarizer film made of a dielectric multilayer film and a stack film, and is arranged so that the emission angle is approximately the priusta angle, and the stack film selectively reflects S-polarized light. is totally reflected. ), selectively transmits P-polarized light. Furthermore, between the stack film and the glass substrate 28 and between the stack film and air,
Each has an anti-reflection coating that prevents the reflection of P-polarized light, and as a result, the transmittance of P-polarized light is 95% or more, and the S
The reflectance of polarized light is increased to over 99%. Note that the stacked film is made of, for example, T i Ox with different refractive indexes n.
(n'#2.2), S i 02 (n piece 1.5)
It is formed by coating about 20 to 30 layers of etc.

Therefore, the P-polarized light 15 emitted from the right eye liquid crystal panel 26
is transmitted through the polarizer 30 without being reflected by the polarizer 30, and is also emitted from the left eye liquid crystal panel 27 and reflected by the reflecting mirror 23''.
The S-polarized light 14 whose optical path is turned back is reflected by the polarizer 30. As a result, the P-polarized light 15 and the S-polarized light 14 are projected together by a single projection lens 10 onto the screen 11, forming magnified images for the right and left eyes, respectively, on the screen 11.

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

The polarized glasses 31 use a polarizing plate that transmits P-polarized light and blocks S-polarized light in the right eye part, and uses a polarizing plate that transmits S-polarized light and blocks P-polarized light in the left eye part. Therefore,
By using the polarized glasses 31, only the P-polarized light 15 that displays an image for the right eye reaches the right eye, and only the S-polarized light 14 that displays the image for the left eye reaches the left eye.
Three-dimensional images can be reproduced.

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

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

The polarizer 18 shown in FIG. 7 is used in place of the polarizer 16 shown in FIG. 1 or 5. First, a polarizing beam splitter film 6 is coated on the slope of the right-angle prism 32, and then A polarizing beam splitter prism is constructed by bonding a right angle prism 32 and another right angle prism 32' so that their slopes face each other, and then coating the cold filter film 20 on the incident surface of the polarizing beam splitter prism. Created by

The infrared light 13 of the lamp light 12 incident on the polarizer 18 is reflected by the cold filter film 20, and only visible light enters the polarizer 18 and reaches the polarizing beam splitter film 6. The light is then split into visible P-polarized light 15 and S-polarized light 14 by the polarizing beam splitter film.

FIG. 8 is a 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.
A glass substrate 4' whose surface is coated with a cold mirror film 5 and a glass substrate 4' whose surface is coated with a polarizing beam splitter film 6 are bonded together.

Next, as an example of the present invention, the polarizer 1 shown in FIG.
A polarizing microscope using 8 will be explained.

FIG. 9 is a block diagram schematically showing the structure of a polarizing microscope as an embodiment of the present invention.

The polarizing microscope shown in FIG. 9 is used for observing rocks, minerals, etc., and uses the polarizer 18 shown in FIG. 7.

The light beam emitted from the lamp 1 and the light beam reflected by the concave mirror 2 are converted into parallel light beams by the lens 3 and are incident on the polarizer 18 . Then, the light is emitted from the polarizer 18.
The S-polarized light 14 from which infrared rays have been blocked is focused by the lens 7 and irradiated onto the object 34 on the stage 33 .

An objective lens 35 provided in the lens barrel 38. An enlarged image of the object to be observed 34 is obtained by the eyepiece 37.

Further, since an analyzer 36 made of a rotatable polarizing plate is arranged in the middle of the lens barrel 38, the observation state can be changed by rotating the analyzer 36.
Can be used as a polarizing microscope.

According to this embodiment, the optical element for blocking infrared rays and the optical element for obtaining linearly polarized light, which were separate in conventional polarizing microscopes, are configured into one optical element as the polarizer 18. Because of this, the number of parts is small,
Costs can also be reduced.

〔Effect of the invention〕

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

Therefore, the life of the liquid crystal projector device will not be shortened due to the life of the polarizing plate being shortened due to an increase in the temperature of the polarizing plate.

In addition, the temperature rise of the liquid crystal panel due to the temperature rise of the polarizing plate is eliminated, and since the polarizer placed between the light source and the liquid crystal panel blocks infrared rays, the temperature rise of the liquid crystal panel is further suppressed. Therefore, there is no possibility that the liquid crystal material in the liquid crystal panel malfunctions and degrades the quality of reproduced images.

Furthermore, since the beam splitter film that constitutes the polarizer disposed between the light source and the liquid crystal panel has a high degree of polarization and high light transmittance, it is possible to obtain a bright image with a high contrast ratio.

Furthermore, even when a plurality of liquid crystal panels are used, they can be efficiently irradiated with light from the light source, making it possible to easily realize a large-screen, high-image-quality liquid crystal projector device at a low cost.

In addition, when using a right-eye liquid crystal panel and a left-eye liquid crystal panel, the right-eye image and the left-eye image can be easily separated by a polarizer placed between the light source and the liquid crystal panel.
Three-dimensional images can be easily reproduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram schematically showing the configuration of a liquid crystal projector device as an embodiment of the present invention, and FIG. 2 shows the light transmittance of the cold mirror film in FIG. 1. A characteristic diagram showing an example of the spectral characteristics of the lamp light incident on the cold mirror film and the transmitted light transmitted through the cold mirror film, respectively. Figure 3 shows an example of the spectral characteristics of the polarizing beam splitter film in Figure 1. 4 is a block diagram schematically showing the structure of a liquid crystal projector device as another embodiment of the present invention, and FIG. 5 is a schematic diagram showing the structure of a liquid crystal projector device as another embodiment of the present invention. 6 is a block diagram schematically showing the structure of a liquid crystal projector device as yet another embodiment of the present invention, and FIG. 7 is a block diagram schematically showing the structure of a liquid crystal projector device as another 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. 9 schematically shows the configuration of a polarizing microscope as an embodiment of the present invention. Fig. 10 is a block diagram schematically showing the structure of a conventional liquid crystal projector device;
It is. Explanation of symbols 1... Lamp, 3, 7... Lens, 4... Glass substrate, 5... Cold mirror film, 6... Polarizing beam splitter film, 8... Liquid crystal panel, 9... ··Polarizer,
10... Projection lens, 1... Screen.

Claims (1)

[Claims] 1. At least a light source, a condensing optical system, a liquid crystal panel, a projection lens, and a screen are provided, and after the light rays emitted from the light source are condensed by the condensing optical system, the light beams are directed to the liquid crystal panel. In a liquid crystal projector device, the image displayed on the liquid crystal panel is enlarged and formed on the screen by projecting the light beam transmitted through the liquid crystal panel onto the screen by the projection lens. A first optical thin film that blocks infrared rays and transmits only visible light among light rays and a second optical thin film that obtains linearly polarized light having a specific plane of polarization from incident unpolarized light rays are the same optical film. A liquid crystal projector device, characterized in that a polarizer formed as an element is provided in an optical path of a light beam from the light source to the liquid crystal panel. 2. Equipped with at least a light source, a condensing optical system, a liquid crystal panel, a projection lens, and a screen, the light beam emitted from the light source is condensed by the condensing optical system, and then irradiated onto the liquid crystal panel; In a liquid crystal projector device that projects a light beam that has passed through the screen onto the screen using the projection lens to enlarge and form an image displayed on the liquid crystal panel on the screen, the infrared rays of the incident light beam are reflected. A cold mirror film that transmits visible light is coated on one surface of the glass substrate, and a polarizing beam splitter film that splits an incident unpolarized light beam into two linearly polarized light beams whose polarization planes are orthogonal to each other is applied. A liquid crystal projector device, characterized in that a polarizer formed by coating the other surface of a glass substrate is provided in the optical path of light rays from the light source to the liquid crystal panel. 3. At least a light source, a condensing optical system, a liquid crystal panel, a projection lens, and a screen are provided, and after the light beam emitted from the light source is condensed by the condensing optical system, it is irradiated onto the liquid crystal panel, and the liquid crystal panel is In a liquid crystal projector device that projects a light beam that has passed through the screen onto the screen using the projection lens to enlarge and form an image displayed on the liquid crystal panel on the screen, the infrared rays of the incident light beam are reflected. A polarizing beam splitter that splits an incident unpolarized light beam into two linearly polarized light beams whose planes of polarization are orthogonal to each other by coating one surface of a first glass substrate with a cold mirror film that transmits visible light. A polarizer formed by coating one surface of a second glass substrate with a film and bonding the first and second glass substrates together is provided in the optical path of the light ray from the light source to the liquid crystal panel. Characteristic LCD projector device. 4. At least a light source, a condensing optical system, a liquid crystal panel, a projection lens, and a screen are provided, and the light beam emitted from the light source is condensed by the condensing optical system and then irradiated onto the liquid crystal panel. In a liquid crystal projector device that projects a light beam that has passed through the screen onto the screen using the projection lens to enlarge and form an image displayed on the liquid crystal panel on the screen, the infrared rays of the incident light beam are reflected. A cold filter film that transmits visible light is coated on at least one surface of the first rectangular prism other than the inclined surface, and the incident unpolarized light beam is split into two linearly polarized light beams whose polarization planes are orthogonal to each other. Coating a polarizing beam splitter film on the slope of at least one of the first right-angle prism or the second right-angle prism, and bonding the first and second right-angle prisms with their slopes facing each other. A liquid crystal projector device comprising: a polarizer provided in an optical path of a light beam from the light source to the liquid crystal panel. 5. At least a light source, a condensing optical system, a liquid crystal panel, a projection lens, and a screen are provided, and after the light beam emitted from the light source is condensed by the condensing optical system, it is irradiated onto the liquid crystal panel, and the liquid crystal panel is A liquid crystal projector device that projects a light beam that has passed through the screen onto the screen using the projection lens to enlarge and form an image displayed on the liquid crystal panel on the screen, comprising: an optical system constituting the condensing optical system; At least one of the elements is constituted by a first optical element coated with a cold filter film that reflects infrared rays and transmits visible light among the incident light rays, and also includes a first optical element coated with a cold filter film that reflects the infrared rays of the incident light rays and transmits the visible light rays. A polarizer is provided in the optical path of the light beam from the light source to the liquid crystal panel. A liquid crystal projector device characterized by: 6. The liquid crystal projector device according to claim 2, 3, 4, or 5, wherein the liquid crystal panel is composed of a plurality of liquid crystal panels, and two linearly polarized lights whose polarization planes obtained from the polarizer are orthogonal to each other. Either the light beams are irradiated onto at least one or more different liquid crystal panels, and the light beams that have passed through each liquid crystal panel are combined and then projected onto the screen by the projection lens, or they are directly projected onto the screen by the projection lens separately. A liquid crystal projector device characterized by projecting images. 7. The liquid crystal projector device according to claim 2, 3, 4, or 5, wherein the liquid crystal panel includes a right-eye liquid crystal panel driven by a right-eye video signal and a left-eye liquid crystal panel driven by a left-eye video signal. and an ophthalmic liquid crystal panel, and two planes of polarization obtained from the polarizers are orthogonal to each other.
One of the two linearly polarized light rays is irradiated onto the right eye liquid crystal panel, the other light ray is irradiated onto the left eye liquid crystal panel, and after combining the light rays that have passed through the liquid crystal panels, the projection lens or projecting it onto said screen by
Alternatively, the liquid crystal projector device is characterized in that the liquid crystal projector device directly projects onto the screen using the projection lens. 8. One side of the glass substrate is coated with a cold mirror film that reflects infrared rays and transmits visible light of the incident light beam, and converts the incident unpolarized light beam into two linearly polarized beams whose polarization planes are orthogonal to each other. 1. A polarizer comprising a polarizing beam splitter film that splits the light beam into the other surface of the glass substrate. 9. Coating one surface of the first glass substrate with a cold mirror film that reflects infrared rays and transmits visible light among the incident light beams, and converts the incident unpolarized light beams so that the polarization planes are perpendicular to each other. A polarizer comprising: coating one surface of a second glass substrate with a polarizing beam splitter film that splits into two linearly polarized light beams; and bonding the first and second glass substrates together. 10. A cold filter film that reflects infrared rays 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, so that the incident unpolarized light beams are filtered by a cold filter film that reflects infrared rays and transmits visible light. coating the slope of at least one right-angle prism of the first right-angle prism or the second right-angle prism with a polarizing beam splitter film that splits into two linearly polarized light beams orthogonal to each other;
A polarizer characterized in that the first and second right-angled prisms are bonded together with their slopes facing each other. 11. A polarizing microscope characterized by using the polarizer according to claim 8, 9 or 10.