JP2002296675A - Reflection type light valve projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection type light valve projector which is capable of eliminating the segregation and leakage of light and enhanceing contrast and quality. SOLUTION: First, second and third color lights, which transmit a first selector for polarized wave, have different polarizations. The third color light is projected onto a third modulator through a spectroscopic prism for polarized light and the first and second color lights are dispersed through the spectroscopic prism and projected onto a light separating/mixing prism or a both spectral light prism. The light separating/mixing prism or the both spectral light prism can project the first and second color lights onto the first and second light modulators, and further emit and discharge the third color light which is subjected to the segregation and leakage of light, and thus eliminating projection from the lens.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection type light valve projector, and more particularly to a single-lens reflection type projector.

[0002]

2. Description of the Related Art Present display images are mainly red,
Assembled by a spot pixel that mixes the three primary color rays of green and blue (R, G, B) in order to enhance the image quality and effect of the display, generally emitted from the light source by a lens before the rays are projected on the display The projector is used to process the light beam of the light source by processing the obtained light beam to control the image quality to be the best.

FIG. 4 shows a conventional single-lens projector, which is a kind of conventional example. A single-lens projector 1 includes a first polarization selector 11, a second polarization selector 12, and a polarization beam splitting prism (PBS). 13.Dichroic splitte
r Prism) 14, 1st, 2nd, 3rd light modulators 15, 16, 17,
First, second and third color light beams 10 including a polarizer (Polarizer) 18, a lens 19, etc., and capable of mixing a white light source beam 10 with white light.
1,102,103 (e.g. red, green, blue)
The second and third color rays correspond to the first, second,
The light is modulated by the third light modulators 15, 16, and 17.

[0004] The first and second polarization selectors 11 and 12 are provided by Color Link.
A company-made ColorSelect ^TM filter can be used, the function of which can modulate the polarity of the polarized predetermined color light beam, for example, the original S (P) polarized color light beam can be converted to the P (S) polarized color light beam In FIG. 4, the first and second polarization selectors 11 and 12 are
Used to modulate the polarity of the three colored light beams (eg, green).

The polarized beam splitting prism 13 reflects an S-polarized color light beam at a right angle, and transmits a P-polarized color light beam in a straight line.

The two-color beam splitting prism 14 can split both predetermined color light beams. In the design of FIG. 4, when the first and second color light beams 101 and 102 enter the two-color beam splitting prism 14,
The first color light beam 101 is transmitted, and the second color light beam 102 is reflected at right angles, which has the effect of dispersing the light into two different color light beams.

The first to third optical modulators 15 to 17 are provided at predetermined positions facing the dichroic beam splitting prism 14 and the polarized beam splitting prism 13, respectively.
When the first to third color light beams 101 to 103 can be transmitted, respectively, and the light modulators 15 to 17 conduct by receiving a bias voltage, the first to third color light beams 101 to 103 are modulated and the polarized color light beams are modulated. By changing the polarity, it is possible to reflect and transmit a polarized color light beam of the opposite polarity.
Can be modulated and reflected on the first color light beam 101 of P (S) polarization that emits the same color light beam 101 in the same direction.
The state when the optical modulators 15 to 17 of the third to third are conducting will be described.

[0008] The polarizing plate 18 is a device in which light is an electromagnetic wave and contains a number of different vibration vector components, while reflecting only a specific vibration vector component in a direction orthogonal to the light traveling direction. The other components absorb, so that they transmit only a single color of color light. In the embodiment shown in FIG. 4, it is possible to pass only the P-polarized color light beam and absorb the S-polarized color light beam. Work to purify.

When used, polarized (eg S-polarized)
When the first white light source beam 10 is projected on the first polarization selector 11, the first and second color light beams 101 and 102 (for example, red and blue)
Maintain polarization, but the third color ray 103 (e.g., green) is P
Modulated to polarization. Next, when each color light beam enters the polarization beam splitting prism 13, the first and second color light beams of S polarization
101, 102 (e.g., red, blue) are reflected at right angles and enter the dichroic beam splitting prism 14, where the third color beam 103 of P polarization
(For example, green) is transmitted straight through the polarization beam splitting prism 13. S-polarized first and second color light rays 101 and 102 (for example, red,
When (blue) reaches the dichroic beam splitting prism 14, the first color light beam 101 (e.g., red) directly passes through the dichroic beam splitting prism 14, is projected on the first light modulator 15, and the polarity is modulated. The light is reflected as a first color light beam 101 (e.g., red) of the P polarization in the opposite direction, and passes straight through the dichroic beam splitting prism 14 and the polarized beam splitting prism 13 in order, and then passes through the second
As the light passes through the polarization selector 12 and the polarizing plate 18, the first color light beam 101 (for example, red) of P polarization further purified by the polarizing plate 18 can be emitted. When the S-polarized second color light beam 102 (e.g., blue) reaches the dichroic beam splitting prism 14, it is reflected at right angles and projected onto the second light modulator 16, where it is modulated by the second light modulator 16. After emitting a P-polarized second color light beam 102 (e.g., blue) reflected in the original direction, and reflected by the two-color beam splitting prism 14 at right angles and transmitted through the polarized beam splitting prism 13, Similarly, by successively transmitting the second polarization selector 12 and the polarizing plate 18 one after another, a further purified second color light beam 102 (for example, blue) of P polarization can be emitted. On the other hand, the third color light beam 103 (e.g., green) that has been modulated to P polarization by the first polarization selector 11 and has directly passed through the polarization beam splitting prism 13 is projected onto the third light modulator 17, When reflected by the modulation of the third light modulator 17 as a third color light beam 103 (for example, green) of S polarization in the opposite direction, and subsequently reflected at right angles through the polarization beam splitting prism 13, First, the second polarization selector 12 modulates the signal into P-polarized light, and further passes through the polarizer 18 to project a more purified third color light beam 103 (for example, green) of P-polarized light.

The first, second and third color light beams 101 and 10 of the P polarization
The lens 1 103 is used for synthesizing an image by simultaneously projecting each color light beam when the light is emitted from the polarizing plate 18 simultaneously.
9 and projected through a lens 19 onto a previously provided projection screen as a composite image.

The conventional single-lens projector comprises a polarization beam splitting prism 13 and a dichroic beam splitting prism 14, and a pair of first and second polarization selectors 11 and 12 capable of modulating the polarity of a predetermined color light beam. The combination has the effect of dispersing white light into the three primary colors, modulating each light modulator, and then mixing again. Of these, the optical polarization boom spectral prism 13 has the effect of the current manufacturing technology. Due to the limitations of the above and the characteristics of the polarized color light beam, the P-polarized color light beam has a low transmittance. The color light rays are reflected at right angles to cause a segregation light leakage phenomenon (as indicated by a dotted arrow in the figure), and this small part of the P polarized light leakage light 103 ′ is projected onto the two-color beam spectral prism 14 and Depending on the situation, it may be mixed with the first optical modulator 15. Or / and mixed into the second optical modulator 16 is reflected, when the first and second light modulators 15 and 16 is not conducting, the light leakage 10 of P polarization
3 ′ is reflected and transmitted through the dichroic beam splitting prism 14, the polarized beam splitting prism 13 and the polarizing plate 18, and then the lens 19
The image is projected onto a screen, and at this time, the gray scale coordinates of the imaging effect are remarkably shifted, the contrast of the image is deteriorated, and the display effect of the display is deteriorated.

[0012]

That is, an object of the present invention is to provide a reflection type light valve projector capable of removing segregated light leakage and improving contrast and quality.

[0013]

To achieve the above object, the present invention provides a polarized light beam splitting prism, a light separating / mixing prism, and first, second, and third light modulators for forming a light source beam. The first, second, and third color light beams that can be mixed with the light source beam can be separated, and the first to second color light beams and the third color light beam can be changed in polar phase to a right angle so that the first to the second light beams can be mixed. In the reflection type light valve projector, each of the three color light beams is modulated by the first to third light modulators, and when the light modulator is turned on, the polarity is changed and reflected, and then the light is output from the lens and projected. The polarization beam splitting prism is mounted on the optical path of the first to third color light beams emitted by the light source, and the first and second color light beams are projected to a light separating / mixing prism, and the third The color light beam And transmitting the light to the third light modulator, and setting the light separating / mixing prism in a direction in which the first and second color light beams of the polarized beam splitting prism are output. The second color light beam is projected onto the first and second light modulators, respectively, and the third color light beam is transmitted.

Alternatively, a first spectral prism and a second spectral prism are used instead of the light separating / mixing prism,
The second spectral prism is installed in the direction of outputting the first and second color light beams of the polarized beam spectral prism, the second color light beam is projected to the second light modulator, and the second
1, the third color light is transmitted and projected to the first spectral prism, and the first spectral prism is provided in the direction in which the second spectral prism outputs the first and third color light, The first
Projecting the color light beam onto the first light modulator,
The third color light beam is configured to be emitted outside the device.

Further, a first polarization selector is provided on an optical path before the first to third color light beams enter the polarization beam splitting prism, and the first to third color light beams are transmitted. At this time, the polarity of the third color light beam may be modulated, or the third color light beam may be interposed between the lens and the polarized beam splitting prism.
Providing two polarization selectors, so as to modulate the polarity of the third color light when the first to third color light is transmitted, or between the lens and the second polarization selector A polarizing plate may be attached between them, the first and second spectral prisms may be separated by an appropriate gap, and a second complete spectral prism may be provided on a side surface of the second spectral prism facing the polarized beam spectral prism. A reflective interface is formed, and a second spectral interface is provided on the side surface facing the first spectral prism. The first,
The second color light beam transmitted through the third color light beam and projected from the polarized beam splitting prism is reflected by the second spectral interface, and further totally reflected by the second total reflection interface to form a second color light beam. 2 to the light modulator, the first spectral prism forms a first total reflection interface on the side facing the second spectral prism, and on the side serving as the back surface with respect to the second spectral prism. A first spectral interface is provided. Of the first and third color light beams projected from the second spectral prism, the first color light beam is transmitted to reach the first light modulator, and the third color light beam is subjected to the first spectral light. The light is reflected by the interface, and is further totally reflected by the first total reflection interface and is discharged to the outside of the apparatus. Alternatively, the first spectral prism is provided on the side surface facing the second spectral prism with the first spectral prism. Forming a total reflection interface, providing a first spectral interface on the other side surface, and among the first and third color light beams projected from the second spectral prism,
The first color light beam is reflected by the first spectral interface,
It is more preferable that the light is totally reflected by the total reflection interface to reach the first light modulator, and the third color light beam is directly transmitted and discharged outside the device.

According to the present invention having the above-described configuration, when white light of S polarization is projected on the first polarization selector, the third color light is modulated into P polarization and the first and second color light are modulated. To maintain the original S-polarized light beam, and the first and second color light beams are reflected at right angles by a polarization beam splitting prism to separate light.
Sent to the mixing prism or both splitting prisms, the third color light beam directly passes through the polarized beam splitting prism,
The light is projected onto the third light modulator, is modulated by the third light modulator, and is transmitted as a third color ray of S polarization reflected in the opposite direction, and subsequently reflected at right angles by the polarization beam splitting prism. Then, the second polarization selector selects the P-polarization
The light beam is modulated into three color light beams and further transmitted through a polarizing plate to obtain a more purified third color light beam of P polarization.

On the other hand, when the first color light beam of the S polarization reaches the light separating / mixing prism, it is reflected at right angles to the first color light beam.
Is projected as a first color light beam of P polarization, which is modulated by the first light modulator and reflected in the opposite direction, and then reflected again at right angles to the light separation / mixing prism. Then, after passing directly through the polarization beam splitting prism, the light passes through the second polarization selector and the polarizing plate in order to obtain a more purified first color light beam of P polarization. Also,
The second color light beam of the S polarization is also reflected by the light separating / mixing prism, is projected on the second light modulator, and after being modulated by the second light modulator, is reflected in the opposite direction. After being transmitted as a second color light beam of polarization, and again reflected forward through the light separation / mixing prism, and directly passing through the polarization beam splitting prism, the second polarization selector and the polarizing plate are sequentially passed through. It is possible to obtain a second color light beam of P polarization which is transmitted and further purified. Then, the purified first, second, and third color light beams of the P-polarized light can be transmitted from the polarizing plate, and can be projected on a screen as a composite image via a lens. Since the polarized beam splitting prism is used, when the P-polarized third color ray passes through the polarized beam splitting prism, a small part of the third color ray is reflected at right angles. As a result, a color ray of segregated leakage light is generated. However, since a light separating / mixing prism or both splitting prisms are provided on the optical path of the third color light ray of the segregated leakage light, it can be eliminated from the apparatus.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on embodiments, but the present invention is not limited to these examples.

FIG. 1 shows a first embodiment of a reflection type light valve projector according to the present invention. The reflection type light valve projector 2 includes a first polarization selector 21 and a second polarization selector 21.
2 polarization selector 22, polarization beam splitting prism 23, polarizing plate 24, light separation / mixing prism (x-prism) 25, first light modulator 26, second light modulator 27, third light modulator 28 , And a lens, and the first, second, and third color light beams 31, 32, 33 (e.g., red, blue,
(Green), and the first to third light modulators 26 to 28 in which the first to third color light beams 31 to 33 are respectively installed.
Modulation processing. The following description is for the case where the first to third optical modulators 26 to 28 are all conducting, and for convenience of explanation, the first, second, and third S-polarized light beams are respectively applied. The reference numerals 31S, 32S, and 33S are attached, and the first, second, and third P-polarized light beams are assigned the reference numerals 31P, 32P, and 33P, respectively.

The first and second polarization selectors 21 and 22 are provided by Color Link.
A company-made ColorSelect ^™ filter can be used, and its operation can modulate the polarity of the polarized predetermined color light beam. In this embodiment, the third color light beam 33S (e.g., green) originally having S polarization can be used. Modulate to P polarization.

The polarization beam splitting prism 23 reflects the S-polarized color light beam at right angles, and directly transmits the P-polarized color light beam. 1, the polarized beam splitting prism 23 is located on the right side of the first polarization selector 21 and positioned behind the second polarization selector 22,
The first and second polarized light beams 31, 32 (for example, red and blue) are reflected backward, and the third colored light beam 33 (for example, green) having P polarization is directly passed to the right. Then, due to the characteristics of the polarized beam splitting prism 23, when the third color light beam 33P passes through the polarized beam splitting prism 23, the partial color light beam is reflected backward, and in the following description, the partially shifted leakage light The third
Are indicated by 33P ′.

The polarizing plate 24 is a fence plate for transmitting only a certain kind of polarized color light beam. In this embodiment, it transmits a P polarized color light beam and absorbs an S polarized color light beam. Each of the transmitted color light beams having a predetermined polarization can be further purified. As seen from FIG. 1, the polarizing plate 24 is the second
Of the polarization selector 22 is provided in front.

The spectral separation / mixing prism 25 has a characteristic of reflecting the first and second color light beams 31 and 32 (for example, red and blue) and transmitting the third color light beam 33P '(for example, green). I have.
In FIG. 1, a light separating / mixing prism 25 is attached behind the polarized beam splitting prism 23, and the first and second color light beams 3 are provided.
1, 32 (e.g., red, blue) light separation / mixing prism 25
When the light is projected, the light separating / mixing prism 25 reflects the first color light beam 31 (e.g., red) to the right, reflects the second color light beam 32 (e.g., blue) to the left, and outputs the third color light beam 33P. '(Eg, green) is transmitted directly backwards.

Each of the first to third light modulators 26 to 28 is a reflection type light modulator. When the first to third color light beams 31 to 33 are projected and conducted, respectively.
The polarization polarities are modulated to reflect differently polarized light beams in different directions. As shown in FIG. 1, the first and second light modulators 26 and 27 correspond to the light separation / mixing prism 25, respectively. The third optical modulator 28 is mounted on the right side of the polarization beam splitting prism 23.

In use, when the S-polarized white light 3 is projected rightward onto the first polarization selector 21, the first polarization selector
21 converts the third color ray 33S to the P-polarized third color ray 33S.
Modulate to P and leave the first and second color light beams 31S and 32S as they are
Maintain S-polarization, and further to the right polarized beam splitting prism 23
, The first and second color light beams 31S and 32S are reflected rightward and backward by the polarization beam splitting prism 23 to reach the light separation / mixing prism 25, and the third color light beam 33P is directly polarized. A third color beam of S-polarized light that passes through the beam splitting prism 23, projects on the third light modulator 28, and is modulated by the third light modulator 28 and reflected to the left in the opposite direction.
33S is transmitted, and subsequently reflected at right angles by the polarization beam splitting prism 23, the second polarization selector 22 modulates into a third color light beam 33P of P polarization, and further transmits through the polarizing plate 24. Thus, a more purified third color light beam 33P of P polarization can be obtained.

On the other hand, when the S-polarized first color light beam 31S reaches the light separating / mixing prism 25, it is reflected at right angles and projected to the first light modulator 26 on the right side. It is transmitted as a first color light beam 31P of P polarization which is reflected to the left in the opposite direction after being modulated by 26, and is then reflected again forward through a light separation / mixing prism 25 at a right angle to form a directly polarized beam. After passing through the spectral prism 23, the P is further purified by passing through the second polarization selector 22 and the polarizing plate 24 in that order.
A polarized first color ray 31P is obtained. Similarly, the S-polarized second color light beam 32S also reaches the light separating / mixing prism 25 and is reflected at right angles to the second light modulator 27 to the left.
And after being modulated by the second optical modulator 27,
Second color ray 32 of P polarization reflecting rightward in the opposite direction
P, and is again reflected forward through the light separation / mixing prism 25 to form the direct polarization beam splitting prism 23.
After passing through the second polarization selector 22 and the polarizing plate 24, the second color light beam 32P of the P-polarized light, which is further purified by passing back and forth through the second polarization selector 22 and the polarizing plate 24.
Can be obtained.

The first of the above-purified P polarizations,
When the second and third color light beams 31P, 32P, and 33P are transmitted from the polarizing plate 24, each color light beam passes through a lens used for projecting and synthesizing an image, and is provided in advance through the lens. Projected on the projected projection screen.

In this embodiment, the polarization beam splitting prism 23 is similarly used, so that the third color light beam 33P of P polarization is used.
When the light passes through the polarization beam splitting prism 23, a small part of the third color light ray 33P 'is reflected at right angles to cause a segregation light leakage phenomenon (as indicated by a dotted arrow in the figure). In the example, the light separation / mixing prism 25 is mounted on the optical path of the third color light beam 33P ′ of the segregated leakage light, and the light separation / mixing prism 25 is attached to the first and second color light beams 31 in a predetermined wavelength range.
S, 32S are reflected, and the third color light beam 33P ′ of the segregation leakage light is directly transmitted backward, so that the third color light beam 33P ′ of the segregation leakage light is discharged from the reflection type light valve projector 2, The projection projection can be prevented, the gray scale coordinates of the imaging effect can be stabilized, the image contrast can be reliably improved, and the display quality can be improved.

FIG. 2 shows a second preferred embodiment of the reflection type light valve projector of the present invention. The structure of this embodiment is almost the same as that of the first embodiment.
Similarly, the reflection type light valve projector 4 has a first polarization selector 41, a second polarization selector 42, a polarization beam splitting prism 43, a polarizing plate 44, a first light modulator 46, a second light modulator 47, It includes a third light modulator 48 and a lens. The difference is that, instead of the light separating / mixing prism used in the first embodiment, the present embodiment uses the first and second splitting prisms 451 and 452 each provided with a color separation plating film.
Second, in regard to processing the third color light beams 51, 52, and 53, the description of the present embodiment will be made in a state where the optical modulator is conductive.

The two spectral prisms provided with the color separation plating film are respectively a first spectral prism 451 and a second spectral prism 4.
52, an appropriate gap 453 is provided between the first and second splitting prisms 451 and 452, and the second splitting prism 452 is attached to the rear end side of the polarized beam splitting prism 43 and is separated by the gap. On the front side facing the polarization beam splitting prism 43, a second
Forming a total reflection interface 454, and the first spectral prism
A second spectral interface 455 is provided on the rear side close to 451, and the second color light beam 52 is totally reflected in the second spectral prism 452, and the first
An environment for transmitting the third color light beams 51 and 53 is formed. Therefore, when the first and second color light beams 51 and 52 are reflected from the polarized beam splitting prism 43 toward the rear end and projected on the second splitting prism 452, the first color light beam 51 is directly directed toward the rear end. Is transmitted through the second spectral prism 452 to the second color light beam 5
Reference numeral 2 denotes a second spectral interface 4 inside and behind a second spectral prism 452.
55, reflection and total reflection occur at the second total reflection interface 454, respectively, and are sent to the second light modulator 47, where the polarity is modulated by the modulation processing. The light is reflected and reflected, and further passes through the polarization beam splitting prism 43, the second polarization selector 42, and the polarizing plate 44, so that a more purified second color light beam 52 of polarization can be obtained.

The first splitting prism 451 is attached to the rear end of the second splitting prism 452, forms a first total reflection interface 456 on the front side facing the gap 453, and forms the first splitting interface 456. A first spectral interface 457 is provided on the rear end surface near the light modulator 46, and the third color light beam 53 is totally reflected in the first spectral prism 451 so that the first color light beam passes through the first spectral interface 457. When the first color light beam 51 transmitted through the second spectral prism 452 toward the rear end forms a transmitting environment and passes through the first spectral prism 451 and reaches the first light modulator 46, 1
The polarity is changed by being modulated by the spectral prism 46, and reflected toward the front end in the opposite direction.
Through the spectral prism 452, the polarized beam spectral prism 43, the second polarization selector 42, and the polarizing plate 44 to obtain a more purified first color light beam 51 of polarization.

On the other hand, when the third color light beam 53 has passed through the polarized beam splitting prism 43, a small portion of the third color light beam is also segregated and leaked and reflected toward the rear end. The third color light beam 53 ′ passes directly through the second spectral prism 452 toward the rear end and reaches the first spectral prism 451, and is reflected by the first spectral interface 457 in the first spectral prism 451, In addition, the light is totally reflected by the first total reflection interface 456,
The light exits from the left side of the first spectral prism 451, thereby preventing the third color light beam 53 ′ of the segregated leakage light from returning to the reflective light valve projector 4 and projecting from the lens. Therefore, the gray scale coordinates of the imaging effect can be stabilized, the image contrast can be increased, and the display quality can be improved.

Of course, when the first color light beam and the segregated and leaked third color light beam reach the first spectral prism, the first color light beam is totally reflected in the first spectral prism. The first color modulator may modulate the light, and the segregated and leaked third color light beam may be directly transmitted and emitted from the first spectral prism. Similarly, the segregated and leaked third color light beam may be provided. The effect of eliminating light rays can be obtained. That is, as in the comparatively preferred third embodiment of the reflection type light valve projector of the present invention shown in FIG. 3, the polarization beam splitting prism 6 of the reflection type light valve projector 6 is used.
(1) On the rear end side, first and second spectral prisms 63 and 64, which are similarly separated by a gap 62, are provided.
The first total reflection interface 631 is formed on the front end face facing the gap 62 of the first spectral prism 63, the first spectral interface 632 is provided on the rear end face of the first spectral prism 63, and the segregated light leaks. The point is that three color light rays 73 ′ can pass through the first spectral interface 632, and the first color light ray 71 is reflected by the first spectral interface 632. Therefore, the first color ray 71 is
When projected onto the first spectral prism 63, the first spectral prism 63
The light is reflected by the first spectral interface 632, and further reflects the total reflection of the first total reflection interface 631 to the first light modulator 65, where the light is modulated by the first light modulator 65. On the other hand, the third color ray 73 ′ of the segregated leakage light projected from the polarization beam splitting prism 61 is directly
Transmitted through the first spectral prism 63 and the first spectral prism 63,
This can prevent the segregated and leaked third color light beam 73 'from staying in the reflective light valve projector 6.

[0034]

As described above, the present invention separates the first and second color light beams by using a light separating / mixing prism or both splitting prisms provided with a color separation plating film, and also reduces segregated light leakage. Since the third color light beam can be eliminated and emitted, it can be prevented from staying in the apparatus and projecting from the lens toward the front end, stabilizing the gray scale coordinates of the imaging effect, and increasing the contrast of the image , The display quality can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the arrangement of a first preferred embodiment of the present invention.

FIG. 2 is a schematic view showing the arrangement of a second preferred embodiment of the present invention.

FIG. 3 is a schematic view of the configuration and arrangement of a third preferred embodiment of the present invention.

FIG. 4 is a schematic view showing the configuration and arrangement of a conventional single-lens reflective light valve projector.

[Explanation of symbols]

 2, 4, 6 Reflection type light valve projector 21, 41 First polarization selector 22, 42 Second polarization selector 23, 43, 61 Polarized beam splitting prism 24, 44 Polarizing plate 25 Light separating / mixing prism 26 , 46, 65 first light modulator 27, 47 second light modulator 28, 48 third light modulator 3 white light 31, 51, 71 first color light beam 32, 52 second color light beam 33, 53, 73 Third color light beam 33P ′ Segregated and leaked third color light beam 451, 63 First spectral prism 452, 64 Second spectral prism 453, 62 Gap 454 Second total reflection interface 455 Second spectral interface 456 , 631 First total reflection interface 457, 632 First spectral interface

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H042 CA06 CA07 CA10 CA14 CA17 2H049 BA02 BA05 BB03 BC22

Claims (11)

[Claims] A first, second, and third light source beam can be mixed with a polarized light beam splitting prism, a light separating / mixing prism, and first, second, and third light modulators. The first, second and third color light beams can be separated into light beams by changing the polarities of the first and second color light beams and the third color light beam at right angles. And a reflection type light valve projector that changes the polarity when the light modulator is turned on and reflects the light, and then outputs and projects the light from a lens, wherein the first light source emits the polarized beam splitting prism.
Attached on the optical path of the third color light beam, the first and second color light beams are projected to the light separating / mixing prism, and the third color light beam is transmitted from the light separating / mixing prism to the above. Projected to a third light modulator, the light separating / mixing prism is installed in the direction of emitting the first and second color light beams of the polarized beam splitting prism,
A reflection type light valve projector configured to project the first and second color light beams onto first and second light modulators, respectively, and transmit the third color light beam. 2. A first polarization selector is provided on an optical path before the first to third color light beams enter the polarization beam splitting prism, and the first to third color light beams are transmitted. 2. The reflection type light valve projector according to claim 1, wherein the polarity of the third color light beam is modulated. 3. A second polarization selector is provided between the lens and the polarization beam splitting prism to change the polarity of the third color light beam when the first to third color light beams are transmitted. 2. The reflection type light valve projector according to claim 1, wherein the light valve is modulated. 4. The reflection type light valve projector according to claim 3, wherein a polarizing plate is mounted between said lens and said second polarization selector. 5. A light source comprising: a polarizing beam splitter prism; a first splitter prism; a second splitter prism; and first, second, and third light modulators. The second, the third color light beam can be separated, the first, the second color light beam and the third color light beam by changing the polar phase to a right angle,
A reflection type in which the first to third color light beams are modulated by the first to third light modulators, respectively, and when the light modulator is turned on, the polarity is changed and reflected, and then the light is output from a lens and projected. In a light valve projector, a first light source in which the light source emits the polarized beam splitting prism
To the third color light beam, projecting the first and second color light beams to the second spectral prism, transmitting the third color light beam from the spectral prism, Projecting the light into a light modulator, placing the second spectral prism in a direction in which the first and second color light beams of the polarized beam spectral prism are output, and transmitting the second color light beam to a second light modulator. The projection, the first, the third color light beam is transmitted and projected to the first spectral prism, the first spectral prism the first spectral prism is the first, the second spectral prism
A reflection type light valve which is provided in a direction in which a third color light beam is output, projects the first color light beam onto the first light modulator, and emits the third color light beam out of the device. projector. 6. The reflection type light valve projector according to claim 5, wherein said first and second spectral prisms are separated by an appropriate gap. 7. A second total reflection interface is formed on a side of said second spectral prism facing said polarized beam splitting prism, and a second spectral interface is formed on a side of said second spectral prism facing said first spectral prism. The first and third color light beams are transmitted, the second color light beam projected from the polarized beam splitting prism is reflected by the second spectral interface, and the second total reflection interface is provided. Further total reflection to reach the second optical modulator, the first spectral prism forms a first total reflection interface on the side surface facing the second spectral prism, and the second spectral prism On the other hand, a first spectral interface is provided on a side surface that is a back surface, and among the first and third color light beams projected from the second spectral prism, the first color light beam is transmitted to the first light modulator. And the third color light beam is reflected by the first spectral interface and further reflected by the first Reflection type light valve projector according to claim 5 comprising as discharged to the total reflection to the outside of the apparatus by the reflection surface. 8. A second total reflection interface is formed on a side of said second spectral prism facing said polarized beam splitting prism, and a second spectral interface is formed on a side of said second spectral prism facing said first spectral prism. The first and third color light beams are transmitted, the second color light beam projected from the polarized beam splitting prism is reflected by the second spectral interface, and the second total reflection interface is provided. Further total reflection to reach the second light modulator, the first spectral prism forms a first total reflection interface on the side opposite to the second spectral prism, the first on the other side A first light interface, among the first and third color light beams projected from the second light splitting prism, reflecting the first color light beam by the first light interface, and further by the first total reflection interface; The light is totally reflected to reach the first optical modulator,
6. The reflection type light valve projector according to claim 5, wherein the color light beam is directly transmitted and discharged outside the apparatus. 9. A first polarization selector is provided on an optical path before the first to third color light beams enter the polarization beam splitting prism, and the first to third color light beams are transmitted. 6. The reflection type light valve projector according to claim 5, wherein the polarity of the third color light beam is modulated. 10. A second polarization selector is provided between the lens and the polarization beam splitting prism to change the polarity of the third color light beam when the first to third color light beams are transmitted. 6. The reflective light valve projector according to claim 5, wherein the light valve projector is configured to perform modulation. 11. The reflection type light valve projector according to claim 10, wherein a polarizing plate is attached between said lens and said second polarization selector.