JPH01209480A - Liquid crystal panel and image projecting device using it - Google Patents

Abstract

PURPOSE:To transfer a large amount of compact information surely by equipping a reversal converter for transmitting light of waves P and S: it is polarized by 45 deg. on a part of liquid crystal on which no control signal is impressed, whereas it is not polarized on a part on which the control signal is impressed. CONSTITUTION:A light source 7 which has a total reflection mirror and a condenser lines 9 is arranged opposite to and near the side of a polarizing beam splitter 14. Image forming devices 1' and 1' such as a slide and a liquid crystal panel are disposed on the opposite side of the polarizing beam splitter 14 and on the other side. Reflecting plates 11 and 11 are arranged at the back of the device and a screen 8 is provided though a projection lens 10 on the other side. Moreover, the incident transmission light of polarization is 45 deg. polarized on a part of the liquid crystal on which the control signal is not impressed, and the transmission light is reversely converted not for rotatory polarized where the control signal is impressed. Therefore, only one polarizing plate can cover polarization-related operations, and to whereby the device is made compact and a distortion-free, sharp image of high resolution can be visually recognized.

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology is a technology for the structure of a device that enlarges a color image, etc. formed on a liquid crystal panel by an electronic drive device, etc. onto a screen and projects it into a three-dimensional image, etc. Belongs to a field.

<Summary of the gist> The invention of this application has a polarizing plate attached to the side of a liquid crystal controlled by an electronic drive device and a reflecting plate attached to the rear side to reflect transmitted light from the front side. A liquid crystal panel that picks up an image twice by reflecting it with a rear reflector, and light from a light source such as a halogen lamp are separated into P waves and S waves through a polarizing beam splitter. On the other hand, an image forming panel such as a liquid crystal panel is installed independently with a reflecting plate attached to the back of the panel, and the reflected wave is transmitted through the polarizing beam splitter again and then enlarged and projected onto a screen via a projection lens. This invention relates to an image projection device that has been developed, and is particularly applicable when only one polarizing plate is attached to the front side of a liquid crystal, and transmitted light incident from the front side does not receive a control signal from an electronic drive device to the liquid crystal. is 45° on the outbound trip.
On the return path where the light is rotated and reflected by the reflector, the light is rotated by 45°, while in some parts of the control signal, the light is rotated by 45°.
Light from a liquid crystal panel and a light source having an inverting conversion device for P waves and S waves so that optical rotation of 5 degrees or less or no optical rotation occurs, passes through a polarizing beam splitter, and is reflected. Inversion conversion devices such as a 1/4 wavelength retardation plate, a reflector, and a 45° optical rotation are installed for the P-waves and S-waves. This invention relates to a liquid crystal panel and an image projection device using the liquid crystal panel, which are capable of obtaining the following.

<Prior Art> As is well known, civil society and industrial society have recently become extremely highly developed and have entered the so-called information society.

These highly information-oriented societies owe a great deal to the development of electro-optics for televisions and so-called OP wave devices, and such electro-optical technology is becoming increasingly sophisticated and precise.

<Problems to be Solved by the Invention> Therefore, information processing devices using so-called cathode ray tubes, which are used in television OP wave equipment, etc., are one-to-one direct-view face-to-face type in terms of the display function of said cathode ray tubes. Most of them are in the form of a special video projector, and unless they are in the form of a special video projector, they tend to lack the ability to transmit information to an unspecified number of viewers.Therefore, micro televisions using liquid crystal panels have recently been mass-produced and put into practical use. Taking advantage of the light transmittance of the seed liquid crystal panel, light from a light source such as a halogen lamp is transmitted through the liquid crystal panel, and an image formed on the liquid crystal panel by an electronic drive device is further developed. Technologies for enlarging and projecting images onto a screen via a projection lens have been developed and are being put to practical use in schools, research institutes, factories, etc.

As for the images formed on the liquid crystal panel, from the early monochrome type, in recent years it has become possible to project color images, and the resolution and definition of information processing has increased, making general education and Although it has become extremely effective for viewing entertainment such as television and videos, in industrial society such as schools and research institutes, the projection of 3D images is becoming more and more popular due to colorization and the advancement of information processing. It is becoming more and more sought after.

In micro televisions and the like using these liquid crystal panels, the liquid crystal panel 1 is electrically connected to a predetermined electronic drive device 2, and there are An alignment film 5.5 is attached via a transparent electrode 4.4, and a glass substrate 6.6 is attached on the outside thereof, and light from a light source 7 is applied to the liquid crystal panel 1 by an electronic drive device 2. The formed image information is picked up and projected onto a screen 8 via a condenser lens 9 and a projection lens 10.

Therefore, in the conventional liquid crystal panel 1 having such a structure, the transmitted light passing through the liquid crystal panel 1 is rotated by 90° or an integral multiple thereof and attached to both the front and back surfaces. In combination with two polarizing sheets, a so-called shutter is configured, and text information and image information are projected.

As shown in FIG. 8, the liquid crystal panel 1 having such a structure is provided with polarizing plates 11 and 11 on the front and rear sides thereof, and a reflecting plate 12 on the back surface of the liquid crystal panel 1 to reflect incident light from the light source 7 to the liquid crystal panel. 1 to pick up image information and project it onto the screen 8 via the projection lens 10, the optical path is shortened and the device becomes more compact, so it tends to be put into practical use. However, as shown in FIG. 8, the incident light from the light source 7 enters the liquid crystal panel 1 obliquely, and
Since the light is emitted obliquely, there are disadvantages in that the image is distorted, the clarity and resolution are reduced, and the contrast is poor.

To deal with this, for example, as shown in FIG.
A so-called half mirror 13 is interposed between the light source 7 and the liquid crystal panel 1 so that the light from the light source 7 is accurately incident on the liquid crystal panel 1,
A technique has also been developed in which the reflected light beam that picks up image information is projected onto the screen 8 via the projection lens 10 by a half mirror 13. The disadvantage was that it was inefficient.

In addition, the image formed on the liquid crystal panel is separated into a polarized image for left viewing and a polarized image for left viewing, which are superimposed on a screen and viewed through polarized glasses for left viewing and left viewing. Technologies have also been developed, including multiple total reflection mirrors and so-called polarizing beam splitters that separate the light from the light source into P-waves and S-waves in order to separate the light from the light source into a left-view LCD panel and a left-view LCD panel. However, the structure has become extremely complicated, and its maintenance such as inspection and maintenance is also troublesome.

Also, in direct-view LCD televisions, etc., as shown in Figure 6, when light P waves and S waves are incident on the liquid crystal panel, the liquid crystal panel performs 90' optical rotation as described above. Therefore, as shown in FIG. 6, for example, in the central part of the liquid crystal panel 1 schematically shown where the control signal is turned on, even if the incident P wave is reflected by the reflection plate 12, the 90' It becomes dark due to optical rotation, and only the part where the υ control signal is not activated is divided into two parts, one for P waves and one for S waves, so that the P wave can pass through and be reflected and emitted, resulting in a bright part. Since two polarizing plates 11 and 11 are required, and two expensive polarizing plates are required, there are disadvantages in that the cost is high and the operation management during manufacturing is extremely complicated.

Recently, research into high-intensity televisions and so-called high-definition televisions has become active in television images.
Since the number of even and odd fields for image formation is constant, there is also the problem that high resolution and definition cannot be obtained, and therefore it is difficult to improve the contrast and sharpness of color images.

<Object of the invention> The object of the invention of this application is to provide high brightness based on the above-mentioned prior art;
The image formed on the liquid crystal panel of high-definition, high-precision television, etc., and the problems of the liquid crystal panel, are considered technical issues to be solved, and while taking advantage of the light transmittance of the liquid crystal panel, it is possible to separate P waves. To further promote high resolution, high precision, high contrast, etc. by utilizing the advantages of a polarizing beam splitter that can carry independent image information on each of the and S wave light. An object of the present invention is to provide an excellent liquid crystal panel and an image projection device using a liquid crystal panel, which are compact, capable of reliably transmitting a high amount of information, and which are useful in the field of image processing technology in the information industry. It is something.

<Background of the Invention> As mentioned above, in the conventional S-wave, the light transmitted through the liquid crystal panel is rotated by 90 degrees or an integral multiple thereof, but in the process of transmitting the light to the liquid crystal panel, the light is rotated by 4 degrees.
The light rotates by 5 degrees, and the incident light and reflected light on the outward and return paths are 9 degrees as a result.
Inversion conversion is performed so that 0° optical rotation is possible, and when P-wave light is incident, the P-wave is a negative image, but the S-wave, which is a positive image, can be incident, and image control is possible. Become.

When the polarizing beam splitter separates the light incident from the light source into P-waves and S-waves, and the P-waves and S-waves are reflected by a predetermined reflecting plate and re-enter, the optical paths of the outgoing and returning paths are different. Since the P wave goes straight and the S wave is reflected, on the outbound path, the P wave goes straight and the S wave is reflected, and these P waves and S waves are reflected by the reflector and enter the polarizing beam splitter again. When doing so, if the P wave and S wave are each inverted and converted, the re-incoming light will both exit at right angles to the initial direction of incidence, and each will carry independent image information onto the screen via the projection lens. For example, as shown in "Applications of Polarizing Film" published by CMC Co., Ltd. dated February 10, 1986, the inversion and conversion of such incident light can be enlarged and projected. For example, the incident light of P in one direction is transmitted through linearly polarized light.
The wave is then turned into circularly polarized light with rotation in one direction when passing through a 1/4 wavelength retardation plate, and then turned into circularly polarized light in one direction when reflected by a reflector, resulting in a 1/4 wavelength phase difference. It is known that when the light passes through the plate again, it is polarized and exits with a phase that is 90° different from that of the first time it passed through the plate. Therefore,
By attaching a 1/4 wavelength retardation plate and a reflection plate behind the polarization beam splitter, the light incident on the polarization beam splitter from the light source is inverted converted into S waves after being reflected by the reflection plate for P waves. It is reflected in a direction 90' different from the incident light, and the S wave incident on the polarizing beam splitter from the light source is reflected by 90' and is reflected by the 1/4 wavelength retardation plate and the reflection plate, and is inverted converted into P wave. This means that the reflected light beam can be focused on the projection lens as a reflected light beam in a direction 90'' different from that of the incident light beam.

On the other hand, among the light beams that enter the polarizing beam splitter from the light source, in a normal liquid crystal panel, a pair of polarizing plates are arranged to cross each other by 90', and brightness and darkness are controlled by driving the power distribution according to the orientation and thickness of the liquid crystal panel. However, by using a liquid crystal panel with a 45° polarization rotation instead of the conventional liquid crystal panel with a 90” rotation, the 45° polarization can be controlled by using the 1/4 wavelength retardation plate described above When the P wave passing through the polarization rotation liquid crystal panel passes through the 1/4 wavelength retardation plate and is reflected by the reflection plate, it passes through as a P wave and re-enters the polarization beam splitter, so in the case of dark control, In contrast, in the case of open control, the P wave that has passed through the 45° polarization rotation and the 1
/4 wavelength When passing through the phase plate, P wave +45+45=S
It becomes a wave and can be reflected in a direction 90" different from the incident direction in order to re-enter the polarizing beam splitter. Therefore, in this way, a 45° polarization rotation liquid crystal panel and a 1/4 wavelength retardation plate are used together. As a result, dark light rays are blocked by the liquid crystal panel having a simple and thin structure, and only bright light rays are reflected, so that the brightness and darkness of the liquid crystal panel can be controlled by a polarizing beam splitter.

<Means/effects for solving the problems> In order to solve the above-mentioned problems, the structure of the invention of this application, which is based on the scope of the above-mentioned patent claims, is to solve the above-mentioned problems.
Therefore, a reflective plate is attached to the back side, and 1 is attached to the front side.
Only one polarizing plate is attached, and for the part where no control signal is applied to the liquid crystal, the incident light is rotated by 45 degrees with polarized light, reflected by the reflecting plate, and emitted again. In between, the light rotates by an additional 45 degrees, and as a result, the polarization direction is rotated by 90' as it passes through the liquid crystal panel, and in the part where the control signal is present, the transmitted light rotates by an angle smaller than 45 degrees, but is reversed so that it does not rotate. By changing the polarizing plate, the device can be made compact with only one polarizing plate, and it is possible to see clear images with high precision without distortion. Also, when projecting an image by transmitting light, the light rays from the light source are polarized. The P wave passes through the polarizing beam splitter, and the S wave passes through the polarizing beam splitter, and the S wave passes through the polarizing beam splitter. The P wave that was reflected at right angles and passed through the original image is 1/4
It passes through the wavelength retardation plate, is reflected by the reflector, and is reflected from linearly polarized light to circularly polarized light as S waves.Conversely, the S waves reflected by the polarizing beam splitter are converted into P waves by linearly polarized light and circularly polarized light. The re-entered P waves pass through the polarizing beam splitter, and the S waves are reflected and pick up independent image information, which is enlarged and projected onto a screen by the projection lens, and also passes through the polarizing beam splitter. The resulting P wave passes through a 45° polarization rotation liquid crystal panel, passes through a 1/4 wavelength retardation plate, is reflected by a reflector, becomes an S wave, is reflected by a polarizing beam splitter, and enters a projection lens. The optical rotation wave reflected from the polarizing beam splitter also passes through a 45° polarization rotation liquid crystal panel and a 1/4 wavelength retardation plate, and is reflected by a reflection plate to become a P wave, and the P wave and S wave are converted into bright light. The re-incoming P wave passes through, the S wave is reflected and enters the projection lens, and the dark ray passes toward the light source and does not enter the projection lens. Therefore, regarding the P wave and S wave that picked up image information Only bright rays enter the projection lens,
Independent P-wave and S-wave image information is projected on the screen without dark light entering, and the P-wave and S-wave have image information for left vision and image information for left vision. A pair of dichroic prisms were installed on the output and reflection side of the polarizing beam splitter, and each was equipped with a red, green, and blue liquid crystal panel to create a color image. Make sure to include information, and furthermore,
It uses technical means to enlarge and project a clear, high-definition color image onto the screen, or to multiply even and odd fields to enlarge and project a high-precision image onto the screen. be.

<Example> Next, an example of the invention of this application will be described below based on the drawings. Incidentally, portions having the same features as those shown in FIG. 6 and subsequent figures will be described using the same reference numerals.

The embodiment shown in FIG. 1 is one basic aspect of the invention of this application, in which a light source 7 such as a halogen lamp has a total reflection mirror and a condenser lens 9, and a polarizing beam splitter 1.
The polarizing beam splitter 14 is provided opposite to one side of the polarizing beam splitter 14.
On the opposite side and on one side, image forming devices 1', 1' such as slides and liquid crystal panels are provided, and on the back side, reflectors 11', 11' are provided. A screen 8 is provided via a projection lens 10.

Regarding this function, as described above, as shown in FIG.
A wavelength retardation plate 16 is integrally attached and arranged,
In FIG. 2, the P wave of light from a light source (not shown) travels straight through a linear polarizing plate 15, is rotated in one direction by a quarter wavelength retardation plate 16, and is formed into an image by the image forming apparatus 1'. The information is picked up and inverted by the reflecting plate 11', and the image information is picked up again and becomes polarized light whose phase is changed by 90' by the 1/4 wavelength retardation plate 16. It passes through the linear polarizing plate 15 and enters the polarizing beam splitter 14, and is sent to the S The S wave from the light source 7 is reflected laterally by 90' and is reflected laterally by the linear polarizing plate 15 and the 1/4 wavelength retardation plate as described above. 16 twice, the image information is multiplied by image information to become a P wave, which passes through the polarizing beam splitter 14 and enters the projection lens 10, where it is magnified and appears on the screen 8 as P waves and S waves. Superimpose and project.

On the other hand, in the embodiment of the polarizing beam splitter 14 shown in FIG. Because it is a liquid crystal panel, the third
As shown in the figure, a light source (not shown) and a polarizing beam splitter 1
Of the light from 4, the P wave goes straight and passes through polarizing beam splitter 1.
4, enters the 45° polarization rotating liquid crystal panel 1', picks up image information, is reflected by the rear reflector 11', and re-enters the 45° polarized light rotating liquid crystal panel 1'. When the light is turned on and off by energization, in this case it does not rotate by 45 degrees, so it passes as a dark light, and the P wave passes and returns to the direction of incidence, and is not reflected to the projection lens 10 side, creating a kind of blocking state. On the other hand, when the 45° polarization rotating liquid crystal panel 1' is turned on, it is rotated by 45°, so P waves +45+45=P waves +90 are converted to S waves, and in this state, in the bright state, S waves are The wave is reflected from the polarizing beam splitter 14 and enters the projection lens 10.

In this case, exactly the same phenomenon occurs for the S wave that enters the polarizing beam splitter 14 from the light source, and the bright rays do not pass through the polarizing beam splitter 14 after entering, but only the bright rays pass through the polarizing beam splitter 14. The image information formed on either of the 45° polarization rotating liquid crystal panels 1', 1' is surely incident on the projection lens 10 and is enlarged and projected onto the screen 8.

Even if an electronic drive device is incorporated, it is possible to enlarge and project independent image information onto the screen 8 via the projection lens 10.

Therefore, in this case, a pair of liquid crystal panels or 45
° Even field of TV image on polarization rotating LCD panel,
Since it is possible to carry out enlarged projection with an odd number field, it is possible to project an enlarged image with high definition, clarity and good contrast without distortion as so-called high-definition. By superimposing and enlarging and projecting the image and left-viewing image information on the other screen onto a screen, it is possible to visually recognize a clear stereoscopic image for both by using polarized glasses for left-viewing and left-viewing.

Therefore, the embodiment shown in FIG.
Dichroic prisms 1 on both sides of the light source 7 of 4
7.17 is attached to separate the light for image information into three colors of red, green, and blue, and the linear polarizing plates 15 and 1/4 shown in Fig.
Wavelength retardation plate 16, liquid crystal panel 1', and reflection plate 11
By installing an image forming device equipped with a 45° polarization rotation liquid crystal panel 1' and a reflecting plate 11' as shown in FIG. It is possible to form on the screen 8 an enlarged projection of a highly accurate image of an odd field or a colored stereoscopic image.

The embodiment shown in FIG. 5 is another basic embodiment of the liquid crystal panel.
Only one polarizing plate 11 for waves is attached, and a reflecting plate 12 is attached to the back side, and the control signal is applied to the hatched areas at the top and bottom of the liquid crystal panel 1 in the figure. , the incident P wave is reflected by the repulsion plate 12 and exits as it is to form a bright portion, and in the central portion where the control signal is not applied, the incident P wave is optically rotated by 45° on the outgoing path, Furthermore, on the return path where it is reflected by the reflecting plate 12, the light is further rotated by 45 degrees, so that the P wave is finally rotated by 90'' to become the S wave, which is reflected by the polarizing plate 11.
As a result, image formation similar to the conventional mode shown in FIG. 6 is performed, but only one polarizing plate 11h is required, which reduces cost. It is cheaper, more compact, and easier to assemble, manufacture, and maintain.

It goes without saying that the embodiment #A of the invention of this application is not limited to the above-mentioned embodiments; for example, the image information may be not only a color image but also a monochrome image, a slide film, etc. Can be hired.

It goes without saying that the image can also be applied to video images in addition to television images.

<Effects of the Invention> As described above, according to the invention of this application, basically in a liquid crystal panel, the light transmitted from the front side to the back side of the liquid crystal panel is rotated by 45 degrees in the transmission process, and is further rotated by 45 degrees by the reflection plate on the back side. Further 45 degrees while being reflected and transmitted to the surface side
As a result, the light rotates by 90 degrees, so in the part where no control signal is applied to the liquid crystal, the light rotates by 90 degrees and passes through the liquid crystal panel, while in the part where the control signal is applied, the light rotates by more than 45 degrees on both the forward and return trips. The light is rotated at a small angle or not rotated at all, and as a result, image control is performed using a single polarizing plate, which makes it possible to achieve compactness and promote cost reduction. This provides an excellent effect in that a bright, clear image with good contrast and no distortion can be viewed.

In addition, in a projection type image forming apparatus, light from a single light source is separated into P waves and S waves by a polarizing beam splitter, each carrying different image information, transmitted through the polarizing beam splitter again, and then transmitted through a projection lens. In a device for enlarging projection onto a screen, only one polarizing beam splitter can be installed, which greatly simplifies the device, and significantly reduces initial assembly, manufacturing, maintenance, maintenance, and operation. This has the excellent effect of making it easier.

Therefore, not only the initial cost but also the running cost is reduced, and the durability is improved.Furthermore, the length of the optical path to be projected is shortened, so the amount of light that can be used effectively is reduced. The positive side is that the image is more efficient, the brightness and contrast of the image enlarged and projected on the screen is good, and the definition can also be improved.

In this way, the inversion conversion of P waves and S waves to the polarizing beam splitter is performed using a linear polarizing plate, a quarter-wavelength retardation plate, and a reflecting plate, so that light from the light source enters the polarizing beam splitter and forms an image. When picking up image information from the device and re-injecting it into the polarizing beam splitter, it has the excellent effect of being converted into P waves and S waves, ensuring transmission, and being reflected and focused on the projection lens. Ru.

Furthermore, by making the liquid crystal panel attached to the polarizing beam splitter a 45° polarization rotating liquid crystal panel, instead of the conventional liquid crystal panel having two polarizing plates with a 90' phase difference, a 45° Since the liquid crystal panel can be turned, it is easy to control the orientation, thickness, and electrical characteristics of the liquid crystal of the liquid crystal panel, and the structure is simple.
The excellent effect of being able to significantly reduce costs is achieved.

In addition, since the image forming device can be made of such a liquid crystal panel, it is possible to convert color moving images from TV or video to original images, which can be used not only for entertainment and education, but also for studying scientific and technical materials and teaching materials. This has the advantage that the effectiveness of the method increases significantly.

By using the even field or odd field of the television as images for P waves and S waves, an excellent effect can be obtained in that the image can be enlarged and projected on high-definition television with extremely high definition.

Then, by converting the image information picked up by P waves and S waves into left-viewing images and left-viewing images, these images can be superimposed on a single screen and viewed using a polarizing mechanism, etc., resulting in excellent definition. In order for a high three-dimensional image to be visible,
The effect is that information transmission processing is significantly enhanced.

In addition, since a pair of dichroic prisms can be attached to the polarizing beam splitter, it is possible to
In addition, since it is possible to carry three-color image information of red, green, and blue for left vision, it is possible to enlarge and project extremely high-definition color stereoscopic images, etc., which is useful for analyzing and transmitting technical information and for educational effects. Qin has the excellent effect of being able to make a significant leap forward.

[Brief explanation of the drawing]

The drawings are mode diagrams of embodiments of the invention of this application, and FIG. 1 is a schematic plan view of the principle mode, and FIG. 2.3 is a plan view of the combination of a P-wave and S-wave inversion conversion device with respect to a polarizing beam splitter. , FIG. 4 is a schematic plan view of another embodiment, FIG. 5 is a sectional view of another embodiment, FIG. FIG. 7.8.9 is a sectional view of the image projection device. 7... Light source, 14... Polarizing beam splitter, 1
1'... Reflection plate, 10... Projection lens, 8...
Screen, 4', 8.9... Inverting conversion device, 15... Linear polarizing plate, 16... 1/4 wavelength retardation plate, 1'... Engraving of 45° polarization rotation liquid crystal panel drawing 1 Figure 11' Figure 2 Figure 3 Kanbo 7 prisoners 11 Figure 8 Issued in the procedural amendment document) March 16, 1939

Claims (11)

[Claims] (1) In a liquid crystal panel for image formation in which a polarizing plate is attached to the side of the liquid crystal and a reflecting plate is attached to the rear side, the transmitted light is rotated by 45 degrees in the part where there is no control signal for the liquid crystal, 1. A liquid crystal panel comprising an inversion converter for P waves and S waves, which prevents optical rotation of 45 degrees from occurring in a certain portion of a control signal. (2) The liquid crystal panel according to claim 1, wherein the inversion conversion device is composed of a linear polarizing plate, a quarter wavelength retardation plate, and a reflecting plate. (3) The liquid crystal panel according to claim 1, wherein the inversion conversion device is equipped with a liquid crystal panel with polarization rotation of 45 degrees. (4) The liquid crystal panel according to claim 1, wherein one polarizing plate is attached only to the front side of the liquid crystal. (5) A liquid crystal panel for image formation is provided with a reflecting plate for each of the orthogonal P wave and S wave components that are separated from the light from the light source via a polarizing beam splitter, and a projection lens is installed. An image projection device using a liquid crystal panel with a screen disposed oppositely through the liquid crystal panel, characterized in that an inverting conversion device for P waves and S waves is attached to each image forming liquid crystal panel side. image projection device. (6) An image projection device using a liquid crystal panel according to claim 5, wherein the inversion conversion device is composed of a linear polarizing plate, a quarter-wave retardation plate, and a reflecting plate. . (7) An image projection device using a liquid crystal panel according to claim 5, wherein the image forming device is formed of a liquid crystal panel. (8) An image projection device using a liquid crystal panel as set forth in claim 5, wherein the inversion conversion device is equipped with a liquid crystal panel with 45° polarization rotation. (9) An image projection device using a liquid crystal panel according to claim 5, wherein the image forming device is used for forming images in an even field and an odd field of a television. (10) An image projection device using a liquid crystal panel according to claim 5, wherein the inversion conversion device is configured to form a left-view image and a right-view image for three-dimensional image formation. . (11) The above polarizing beam splitter should be equipped with a dichroic prism for P waves and S waves, and each dichroic prism should be equipped with a 45° polarization rotating liquid crystal panel for forming red, green, and blue images. An image projection device using a liquid crystal panel according to claim 5.