JP2008102481A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device capable of accurately synthesizing four or more rays of modulated primary-color light by means of the single device. <P>SOLUTION: The image display device comprises: a primary-color light emitting means for emitting N(≥4) rays of primary color light; a modulated primary-color light generating means 12 for generating modulated primary-color light by modulating primary color light according to an image signal; an image light synthesizing means 13 for synthesizing the modulated primary-color light with image light; and an image light projecting means 14 for projecting the image light. The image light synthesizing means 13 includes a prismatic image optical path, which emits image light from an emission face that is one of square end faces; N modulated primary-color optical paths extending from the side face of the image optical path or/and the other end face of the image optical path, each of which propagates one ray of modulated primary color light; and a dichroic mirror which is formed in the image optical path and by which the modulated primary color light propagated by the modulated primary color optical path extending from the side face of the image optical path is reflected toward the emission face. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image display device, and more particularly to a display device including an integrated image light combining element capable of accurately combining and displaying four or more primary color image lights.

  A color image display device is applied to a television receiver, a display device for a personal computer, or the like, and is roughly classified into a direct view type and a projection type.

  In a direct-view color image display device, in order to increase the resolution and enlarge the screen, it is necessary to reduce the size of the pixels and increase the number of pixels. Therefore, the device becomes complicated and expensive. Inevitable.

  Therefore, it is desirable to use a projection type as a large color image display device, and various projection type color image display devices have been proposed (see, for example, Patent Document 1).

  As shown in the block diagram of FIG. 12, the conventional projection type color image display device disclosed in Patent Document 1 includes a light source 911 that emits white light, and a first light source that separates white light into red light and cyan light. A dichroic mirror 912; a second dichroic mirror 913 that separates cyan light into green light and blue light; a red light liquid crystal light valve 914R that controls the amount of transmitted light of red light, green light, and blue light; and green light liquid crystal It includes a light valve 914G, a blue light liquid crystal light valve 914B, a cross prism 915 that mixes blue light, green light, and red light with controlled light amounts, and a projection lens 916 that projects the mixed light.

  The conventional projection color image display device described above is light-modulated for each of the three primary colors (red, green, and blue) of light, and the three primary colors after modulation are mixed by a cross prism 915 and projected onto a screen by a projection lens 916. ing.

  However, the above-described conventional projection color image display device synthesizes a color image using the three primary colors of red light, green light, and blue light, so that there is a problem that the displayable color range is limited. It was.

  That is, in the above-described conventional projection color image display device, the color outside the triangle connecting the red light source RS, the green light source GS, and the blue light source BS in the chromaticity diagram of the International Commission on Illumination (CIE) shown in FIG. There was a problem that it could not be displayed.

  In order to solve this problem, a projection type color image display device has been proposed in which a displayable color is enlarged using a blue light source BGS in addition to a red light source RS, a green light source GS, and a blue light source BS ( For example, see Patent Document 2 and Non-Patent Document 1).

  As shown in the block diagram of FIG. 14, the conventional projection type color image display device disclosed in Patent Document 2 includes a red light source 921 that emits red light, a blue light source 922 that emits blue light, and a first light source. A first green light source 923 that emits green light, a second green light source 924 that emits second green light having a central wavelength different from that of the first green light, and a first liquid crystal light valve 925 that modulates red light. A second liquid crystal light valve 926 that modulates blue light, a third liquid crystal light valve 927 that modulates first green light and second green light, modulated red light, blue light, and first green light. A cross dichroic prism 928 for mixing the light and the second green light and a projection lens 929 for projecting the mixed light are included.

  In the above-described conventional projection color image display device, the red light source 921 and the blue light source 922 emit light during one frame display period, the first green light source 923 emits light during the first half of the one frame display period, and the second green light source. 924 emits light in the latter half of one frame display period.

  The red light is modulated by the first liquid crystal light valve 925, the blue light is modulated by the second liquid crystal light valve 926, the first green light and the second green light are modulated by the third liquid crystal light valve 927, and mixed by the cross dichroic prism 928. Then, an image is projected by the projection lens 929.

The conventional projection type color image display device disclosed in Non-Patent Document 1 includes a first image projected by a first DLP projector that applies the first three primary colors (R1, G1, and B1), and a second image. The second image projected by the second DLP projector to which the three primary colors (R2, G2, and B2) are combined on the screen, and an image using the six primary colors can be displayed.
JP 2003-241314 A ([0022] to [0026], [FIG. 3]) JP 2004-325477 A ([0018] to [0022], [FIG. 1]) NATURAL VISION Natural Vision Research and Development Project (Video) Research and Development Report (separate volume), published by National Institute of Information and Communications Technology

  However, since the conventional projection color image display device disclosed in Patent Document 2 displays the first green light and the second green light in a time-sharing manner, the light source must be blinked at high speed. There was a problem of not becoming.

  In addition, since the conventional projection type color image display device disclosed in Non-Patent Document 1 synthesizes the projection images from the two DLP projectors on the screen, the two DLP projectors must be positioned optically accurately. There was a problem that had to be done.

  The present invention has been made in order to solve the conventional problems, and provides an image display apparatus including an integrated image light combining element capable of accurately combining four or more primary color modulated lights. With the goal.

[First invention]
An image display device of the present invention includes primary color light emitting means for emitting N (≧ 4) primary color light, primary color modulated light generating means for generating primary color modulated light by modulating the primary color light according to an image signal, An integrated image light combining unit that combines the primary color modulated light with image light; and an image light projecting unit that projects the image light, and the image light combining unit outputs the image light as one square end surface. A rectangular column-shaped image light path that exits from the side surface of the image light path, or the side surface of the image light path and the other square end surface of the image light path, each of which N propagates the primary color modulated light of 1 A primary color modulation optical path; and a dichroic mirror that is formed in the image optical path and reflects the primary color modulation light propagated through the primary color modulation optical path extending from a side surface of the image optical path in the direction of the exit surface. Have .

  With this configuration, four or more primary color modulated lights can be accurately synthesized.

[Second invention]
In the image display device of the present invention, the N primary color modulation optical paths extend from a pair of side faces of the image optical path, or from a pair of side faces of the image optical path and the other square end face of the image optical path. The primary color modulated light may be propagated.

[Third invention]
An image display device of the present invention includes primary color light emitting means for emitting N (≧ 4) primary color light, primary color modulated light generating means for generating primary color modulated light by modulating the primary color light according to an image signal, An integrated image light synthesizing unit that synthesizes the primary color modulated light with image light; and an image light projecting unit that projects the image light, wherein the image light synthesizing unit emits the image light from an exit surface that is one side surface. A positive (N + 1) prismatic image light path that exits, and a dichroic mirror that is formed in the image light path and reflects the primary color modulated light that has entered from a side surface other than the light exit surface of the image light path in the direction of the exit surface You may have the structure containing.

[Fourth Invention]
In the image display device of the present invention, the primary color light emitting means emits red light, yellow light, long wavelength green light, short wavelength green light and blue light, and the primary color modulated light generating means is the red light. The light, the yellow light, the long wavelength green light, the short wavelength green light, and the blue light are modulated according to the image signal to modulate red light, yellow modulated light, long wavelength green modulated light, and short wavelength green modulated light. The first primary color modulation optical path that extends from the first side surface of the first position of the image optical path and propagates the red modulated light, and the image A second primary color modulation optical path that extends from the second side surface adjacent to the first side surface of the second position of the optical path and propagates the blue modulated light, and the first of the second position of the image optical path. The yellow modulation by stretching from the third side facing the side Primary color modulation optical path for propagating light, and fourth primary color modulation for propagating the short wavelength green image light by extending from the fourth side facing the second side of the second position of the image optical path A fifth primary color modulation optical path for propagating the long-wavelength green modulated light from the other square end face of the optical path and the image optical path; and the first modulated position in the image optical path; The first dichroic mirror that reflects in the direction of the other and transmits the primary color modulated light, and the first position in the image optical path, reflects the blue modulated light in the direction of the exit surface, A second dichroic mirror that transmits the other primary color modulated light; and the second dichroic mirror that is disposed at the second position in the image optical path, reflects the yellow modulated light toward the exit surface, and the other primary color modulated light. Third dichroic water that passes through And a fourth dichroic mirror that is installed at the second position in the image optical path, reflects the short wavelength green modulated light in the direction of the emission surface, and transmits the other primary color modulated light. You may have a structure.

[Fifth Invention]
An image display device of the present invention includes primary color light emitting means for emitting N (≧ 4) primary color light, primary color modulated light generating means for generating primary color modulated light by modulating the primary color light according to an image signal, An integrated image light synthesizing unit that synthesizes the primary color modulated light with image light; and an image light projection unit that projects the image light. The primary color light emitting unit includes red light, long wavelength green light, and short wavelength green. The primary color modulated light generating means modulates the red light, the long wavelength green light, the short wavelength green light, and the blue light in accordance with the image signal to emit red light. Light, long-wavelength green modulated light, short-wavelength green modulated light, and blue modulated light, and the image light combining means transmits the red modulated light, the long light from four surfaces other than a pair of opposing surfaces of a regular hexahedron. Wavelength green modulated light, the short wavelength green modulated light and the front Uptake blue modulated light, may have a configuration which is one of four faces dichroic prism for emitting the image light from one side of the pair of opposing surfaces.

[Sixth Invention]
In the image display device of the present invention, the primary color modulated light generation means controls a reflective liquid crystal light valve that controls the amount of reflected light according to the image signal, or a transmissive liquid crystal light that controls the amount of transmitted light according to the image signal. The primary color light emitting unit may include a bulb, and the primary color light emitting unit may include a white light emitting unit that emits white light and a white light separating unit that separates the white light into the N primary color lights.

  The present invention provides an image display apparatus having an effect that it is possible to accurately synthesize four or more primary color modulated lights with one apparatus by providing an integrated image light synthesis means for synthesizing primary color modulated light with image light. Can be provided.

Embodiments of an image display apparatus according to the present invention will be described below with reference to the drawings.
As shown in the block diagram of FIG. 1, the image display apparatus 1 according to the present invention includes primary color light emitting means 11 that emits N (≧ 4) primary color light and primary color light by modulating the primary color light according to an image signal. It includes primary color modulated light generating means 12 for generating modulated light, integrated image light synthesizing means 13 for synthesizing primary color modulated light with image light, and image light projecting means 14 for projecting image light.

  The primary color light emitting means 11 may include a white light emitting means 111 that emits white light W and a white light separating means 112 that separates the white light W into N primary color lights.

  FIG. 2 is a perspective view showing an example of a hardware configuration when N = 5 of the image display device 1 according to the present invention. The white light emitting means 111 is a white light source 151.

  The white light separating unit 112 includes a first separation dichroic mirror 161, a second separation dichroic mirror 162, a third separation dichroic mirror 163, and a fourth separation dichroic mirror 164, and converts the white light W into red light R, The light is separated into five primary color lights of yellow light Y, long wavelength green light LG, short wavelength green light SG and blue light B. The combination of the five primary color lights is not limited to the above. For example, the white light W is converted into the long wavelength red light LR, the short wavelength red light SR, the green light G, the long wavelength blue light LB, and the short wavelength blue light. You may isolate | separate into five primary color lights of SB.

  The first separation dichroic mirror 161 and the second separation dichroic mirror 162 are orthogonal to each other and are disposed at an angle of 45 degrees with respect to the optical axis of the white light source 151. The third separation dichroic mirror 163 and the fourth separation dichroic mirror 164 are orthogonal to each other, and the white light source 151 is disposed downstream of the first separation dichroic mirror 161 and the second separation dichroic mirror 162 with respect to the white light source 151. It is arranged at an angle of 45 degrees with respect to the optical axis.

  The first separation dichroic mirror 161 reflects the red light R and transmits the other primary color light. The second separation dichroic mirror 162 reflects the blue light B and transmits the other primary color light.

  The third separation dichroic mirror 163 reflects yellow light Y and transmits other primary color light. The fourth separation dichroic mirror 164 reflects the short wavelength green light SG and transmits the other primary color light.

  The red light R, the yellow light Y, the short wavelength green light SG, and the blue light B are reflected by appropriately disposed reflecting mirrors and enter the image light combining unit 13 from the side wall of the image light combining unit 13. The long wavelength green light LG is incident on the image light combining unit 13 from the end face of the image light combining unit 13.

Incidentally, the primary colors modulated light generating means 12, a first primary color modulated light generating means 121 for generating a modulated red light R _M modulates the red light R, by modulating yellow light Y to produce a yellow modulated light Y _M second primary modulated light generating means 122, the third primary color modulated light generating means 123 for modulating the short wavelength green light SG generates a short wavelength green modulated light SG _M, the blue modulated light by modulating the blue light B B _A fourth primary color modulated light generating means 124 for generating _M, and a fifth primary color modulated light generating means 125 for modulating the long wavelength green light LG to generate the long wavelength green modulated light LG _M. Although installed between the means 11 and the image light combining means 13, it is desirable to make the optical path length downstream from the primary color modulated light generating means 12 equal for all primary color lights in order to synchronize the primary color modulated light.

  The image light projection unit 14 is, for example, a convex lens 141, and projects the image light emitted from the emission surface of the primary color modulated light generation unit 12 onto the screen.

  Hereinafter, an embodiment of the image light combining means 13 will be described.

[First Embodiment]
[First example]
In the first embodiment 2 of the image light synthesizing unit 13 in the case of N = 4, as shown in the top view of FIG. 3 (a), the image light is emitted from an exit surface 21a which is an end surface of one square (one side length = L). The first columnar modulated optical path 221 and the second primary color modulated optical path 222 that extend from the pair of side surfaces 21b and 21c of the image optical path 21 and each propagates one primary color modulated light. The primary color modulated light that has propagated through the third primary color modulated light path 223, the fourth primary color modulated light path 224, and each primary color modulated light path formed in the image light path 21 and extending from the pair of side surfaces 21b and 21c is emitted. A first dichroic mirror 231, a second dichroic mirror 232, a third dichroic mirror 233, and a fourth dichroic mirror 234 that reflect in the direction of the surface 21 a;

  When N = 4, the primary color light is generally four primary color lights of red light R, long wavelength green light LG, short wavelength green light SG and blue light B.

Then, a reflective liquid crystal light valve or a transmissive liquid crystal light valve (hereinafter also simply referred to as a liquid crystal light valve), which is the primary color modulated light generating means 12, is applied to modulate the red light R in accordance with the red image signal to produce a red color. the modulated light R _M, the long wavelength green light LG on the longer wavelength green modulated light LG _M are modulated in accordance with a long wavelength green image signal, short modulates the short wavelength green light SG according to the short wavelength green image signal Wavelength green modulated light SG _M and blue light B are modulated in accordance with a blue image signal and converted to blue modulated light B _M.

Then, the red modulated light R _M is in the first primary color modulated optical path 221, the long wavelength green modulated light LG _M is in the second primary color modulated optical path 222, and the short wavelength green modulated light SG _M is in the third primary color modulated optical path 223. The blue modulated light B _M is incident on the fourth primary color modulated light path 224.

Modulated red light R _M propagates the first primary color modulation light path 221 is emitted from the first dichroic reflected by the dichroic mirror 231 exit surface 21a. The long-wavelength green modulated light LG _M propagates through the second primary color modulated optical path 222, is reflected by the second dichroic mirror 232, passes through the first dichroic mirror 231 and the fourth dichroic mirror 234, and exits from the exit surface 21a. Exit. The short wavelength green modulated light SG _M propagates through the third primary color modulated optical path 223, is reflected by the third dichroic mirror 233, passes through the first dichroic mirror 231 and the fourth dichroic mirror 234, and exits from the emission surface 21a. Exit. Then, the blue modulated light B _M propagates through the fourth primary color modulated optical path 224, is reflected by the fourth dichroic mirror 234, and is emitted from the emission surface 21a.

The first dichroic mirror 231 reflects the red modulated light R _M, passes through the other primary color modulated light. The second dichroic mirror 232 reflects the long wavelength green modulated light LG _M and transmits the other primary color modulated light. The third dichroic mirror 233 reflects the short wavelength green modulated light SG _M and transmits the other primary color modulated light. The fourth dichroic mirror 234 reflects blue modulated light B _M and transmits other primary color modulated light.

Accordingly, image light obtained by combining the red modulated light R _M , the long wavelength green modulated light LG _M , the short wavelength green modulated light SG _M and the blue modulated light B _M is emitted from the emission surface 21a.

In order to maintain the synchronization of the red modulated light R _M , the long wavelength green modulated light LG _M , the short wavelength green modulated light SG _M, and the blue modulated light B _M , all the primary color modulated lights are emitted from the liquid crystal light valve to the emission surface 21a. It is desirable to keep the optical path length to a constant. In the case of FIG. 3A, the optical path length of all primary color modulated light is 4L.

[Second example]
FIG. 3B is a top view of the first embodiment 3 when N = 5. The fifth primary color modulation optical path 325 extends from the other square end face 31d of the image optical path 31 in FIG. Different from (a).

In the case of N = 5, the primary color light is generally five primary colors of red light R, yellow light Y, long wavelength green light LG, short wavelength green light SG and blue light B. Each primary color light is modulated by a liquid crystal light valve and converted into red modulated light R _M , yellow modulated light Y _M , long wavelength green modulated light LG _M , short wavelength green modulated light SG _M and blue modulated light B _M.

The red modulated light R _M is in the first primary color modulated light path 321, the yellow modulated light Y _M is in the second primary color modulated light path 322, and the long wavelength green modulated light LG _M is in the fifth primary color modulated light path 325, and the short wavelength green. The modulated light SG _M is incident on the third primary color modulated optical path 323 and the blue modulated light B _M is incident on the fourth primary color modulated optical path 324.

Modulated red light R _M propagates the first primary color modulation light path 321 is emitted from the first dichroic reflected by the dichroic mirror 331 exit surface 31a. The yellow modulated light Y _M propagates through the second primary color modulated optical path 322, is reflected by the second dichroic mirror 332, passes through the first dichroic mirror 331 and the fourth dichroic mirror 334, and exits from the exit surface 31a. . The long wavelength green modulated light LG _M propagates through the fifth primary color modulated optical path 325 and passes through the first dichroic mirror 331, the second dichroic mirror 332, the third dichroic mirror 333, and the fourth dichroic mirror 334. The light exits from the exit surface 31a. The short wavelength green modulated light SG _M propagates through the third primary color modulated optical path 323, is reflected by the third dichroic mirror 333, passes through the first dichroic mirror 331 and the fourth dichroic mirror 334, and exits from the emission surface 31a. Exit. Then, the blue modulated light B _M propagates through the fourth primary color modulated optical path 324, is reflected by the fourth dichroic mirror 334, and exits from the exit surface 31a.

The first dichroic mirror 331 reflects the red modulated light R _M, passes through the other primary color modulated light. The second dichroic mirror 332 reflects yellow modulated light Y _M and transmits other primary color modulated light. The third dichroic mirror 333 reflects the short wavelength green modulated light SG _M and transmits other primary color modulated light. The fourth dichroic mirror 334 reflects the blue modulated light B _M and transmits the other primary color modulated light. In FIG. 3B, the optical path length of all primary color modulated light is 4L.

  As described above, according to the first embodiment, in an image display apparatus that uses four or more primary color lights, it is possible to synthesize primary color modulated light by an integrated image light synthesis means.

  In the first example and the second example described above, since the optical path from the liquid crystal light valve to the exit surface becomes longer as the number of primary color lights increases, the image leaks due to light leakage from the side surfaces of the primary color modulation optical path and the image optical path. There is a possibility that the brightness of light may decrease.

[Second Embodiment]
The second embodiment aims to solve the above problem by shortening the primary color modulation optical path and the image optical path as much as possible.
[First example]
FIG. 4A is a top view of the second embodiment 4 of the image light synthesizing unit 13 in the case of N = 4. The image light path 41 emits the image light from the emission surface 41a and the optical axis of the image light path 41. Are formed from the side surfaces 41b and 41c of the image optical path 41 at angles θ ₁ , θ ₂ , θ ₃ , and θ ₄ , respectively, and the first primary color modulation optical path 421 and the first primary color modulation optical path 421 respectively transmitting one primary color modulation light 2 primary color modulation light paths 422, third primary color modulation light paths 423 and fourth primary color modulation light paths 424, and the primary color modulated light which is formed inside the image light path 41 and propagates through each primary color modulation light path is directed to the exit surface 41a. The first dichroic mirror 431, the second dichroic mirror 432, the third dichroic mirror 433, and the fourth dichroic mirror 434 that reflect the other primary color modulated light.

The first dichroic mirror 431, the second dichroic mirror 432, the third dichroic mirror 433, and the fourth dichroic mirror 434 are configured such that the optical axis of the image optical path 41, the first primary color modulation optical path 421, and the second primary color The angles θ ₁ , θ ₂ , θ ₃ , and θ ₄ formed by the optical axes of the modulation optical path 422, the third primary color modulation optical path 423, and the fourth primary color modulation optical path 424 are arranged in a direction that bisects.

  The primary color light emitting means 11 applied in the first example emits four primary color lights of red light R, long wavelength green light LG, short wavelength green light SG and blue light B.

The red light R, the long wavelength green light LG, the short wavelength green light SG, and the blue light B are converted into the red modulated light R _M , the long wavelength by the reflective liquid crystal light valve or the transmissive liquid crystal light valve that is the primary color modulated light generation means 12. It is converted into green modulated light LG _M , short wavelength green modulated light SG _M and blue modulated light B _M.

Modulated red light R _M is the first primary color modulation path 421 propagates, enters the optical image paths 41, it is reflected by the first dichroic mirror 431. The long-wavelength green modulated light LG _M propagates through the second primary color modulated light path 422, enters the image light path 41, and is reflected by the second dichroic mirror 432. The short wavelength green modulated light SG _M propagates through the third primary color modulated optical path 423, enters the image optical path 41, and is reflected by the third dichroic mirror 433. The blue modulated light B _M propagates through the fourth primary color modulated optical path 424, enters the image optical path 41, and is reflected by the fourth dichroic mirror 434.

The first dichroic mirror 431 reflects the red modulated light R _M, passes through the other primary color modulated light. The second dichroic mirror 432 reflects the long wavelength green modulated light LG _M and transmits other primary color modulated light. The third dichroic mirror 433 reflects the short wavelength green modulated light SG _M and transmits the other primary color modulated light. The fourth dichroic mirror 434 reflects blue modulated light B _M and transmits other primary color modulated light.

Accordingly, image light obtained by combining the red modulated light R _M , the long wavelength green modulated light LG _M , the short wavelength green modulated light SG _M and the blue modulated light B _M is emitted from the emission surface 41a.

  Even in this example, it is desirable that the optical paths of all primary color modulated light from the liquid crystal light valve to the emission surface 41a have the same length.

[Second example]
FIG. 4B is a top view of the second embodiment 5 of the image light combining means 13 when N = 5, and the fifth primary color modulation light path 525 extends from the other square end face 51 d of the image light path 51. This is different from FIG. 4 (a).

  The primary color light emitting means 11 applied in the second example emits five primary color lights of red light R, yellow light Y, long wavelength green light LG, short wavelength green light SG and blue light B.

The red light R, the yellow light Y, the long wavelength green light LG, the short wavelength green light SG, and the blue light B are converted into a red modulated light R _M , a yellow modulated light Y _M , by a reflective liquid crystal light valve or a transmissive liquid crystal light valve. It is converted into long wavelength green modulated light LG _M , short wavelength green modulated light SG _M and blue modulated light B _M.

Modulated red light R _M is the first primary color modulation path 521 propagates, enters the optical image paths 51 and is reflected by the first dichroic mirror 531. The yellow modulated light Y _M propagates through the second primary color modulated optical path 522, enters the image optical path 51, and is reflected by the second dichroic mirror 532. The short wavelength green modulated light SG _M propagates through the third primary color modulated light path 523, enters the image light path 51, and is reflected by the third dichroic mirror 533. The blue modulated light B _M propagates through the fourth primary color modulated optical path 524, enters the image optical path 51, and is reflected by the fourth dichroic mirror 534. The long wavelength green modulated light LG _M propagates through the fifth primary color modulated light path 525 and enters the image light path 51.

The first dichroic mirror 531 reflects the red modulated light R _M, passes through the other primary color modulated light. The second dichroic mirror 532 reflects the yellow modulated light Y _M and transmits the other primary color modulated light. The third dichroic mirror 533 reflects the short wavelength green modulated light SG _M and transmits the other primary color modulated light. The fourth dichroic mirror 534 reflects blue modulated light B _M and transmits other primary color modulated light.

Accordingly, image light obtained by combining the red modulated light R _M , the yellow modulated light Y _M , the long wavelength green modulated light LG _M , the short wavelength green modulated light SG _M and the blue modulated light B _M is emitted from the emission surface 51a. It will be.

[Third Embodiment]
FIG. 5 is a top view of the third embodiment 6 of the image light combining means 13 in the case of N = 7. The image light combining means 13 is a regular octagon that emits image light from an output surface 61a that is one side surface. The columnar image light path 61 and primary color modulated light that has entered from the side surfaces 61b, 61c, 61d, 61e, 61f, 61g, and 61h other than the regular octagonal prism exit surface 61a in the image light path 61 are directed in the direction of the exit surface 61a. It includes six dichroic mirrors 631, 632, 633, 634, 635 and 636 that reflect.

  In the third embodiment, for example, if the transmissive liquid crystal light valve 62 which is the primary color modulated light generating means 12 is arranged along the side surface 61b, the primary color modulated light path can be omitted, and the image light combining means 13 is provided. It can be downsized.

[Fourth Embodiment]
In the fourth embodiment, the primary color light emitting means 11 emits five primary color lights of red light R, yellow light Y, long wavelength green light LG, short wavelength green light SG and blue light B. The primary color modulated light generation means 12 modulates the red light R, yellow light Y, long wavelength green light LG, short wavelength green light SG and blue light B according to the image signal, thereby modulating red modulated light R _M , yellow modulated light. Y _M , long wavelength green modulated light LG _M , short wavelength green modulated light SG _M and blue modulated light B _M are generated.

The fourth embodiment 7 of the image light synthesizing means 13 has a quadrangular prism shape that emits image light from an emission surface 71a that is one square end face, as shown in the perspective view of FIG. 6 and the four-face view of FIG. an image optical path 71, the first primary color modulation light path 721 that propagates the first extending from the side surface 71b side modulated red light R _M of the first position of the optical image paths 71, the first and the second position of the optical image paths 71 the second primary modulation optical path 722 extending from the second side 71c side adjacent to the side surface 71b propagating blue modulated light B _M, third opposite the first side surface 71b of the second position of the optical image paths 71 The third primary color modulated light path 723 that propagates yellow modulated light Y _M and propagates from the side surface 71d side of the second side 71c of the second position of the image light path 71 extends from the side of the fourth side 71e facing the second side surface 71c. fourth primary modulated light propagating through the wavelength green image light SG _M 724, and a fifth primary modulation optical path 725 that propagates the long wavelength green modulated light LG _M from the other square end surface 71f of the optical image paths 71.

  The first position is a range from zero to L along the side surface from the emission surface 71a, and the second position is a range from L to 2L along the side surface from the emission surface 71a. It is supposed to be. Further, in the embodiment of FIGS. 6 and 7, a transmissive liquid crystal light valve is disposed on the square end surface of the side length L of each primary color modulation optical path, and the optical path from the square end surface of each primary color modulation optical path to the emission surface 71a. The case where the length is 3L is shown.

Image synthesizing means 13, further, the first is placed in a position modulated red light R _M of the image light path 71 is reflected in the direction of the emission surface 71a, a first dichroic mirror 731 which transmits other primary colors modulated light A second dichroic mirror 732 that is installed at the first position in the image light path 71 and reflects the blue modulated light B _M in the direction of the emission surface 71 a and transmits the other primary color modulated light, and a second in the image light path 71. A third dichroic mirror 733 that reflects the yellow modulated light Y _M in the direction of the emission surface 71a and transmits the other primary color modulated light, and a second wavelength in the image optical path 71, and has a short wavelength. green modulated light SG _M and reflected in the direction of the emission surface 71a, and a fourth dichroic mirror 734 which transmits other primary color modulated light.

  In this embodiment as well, it is desirable that the optical paths of all primary color image light from the liquid crystal light valve to the emission surface 71a have the same length.

  In the embodiment of FIGS. 6 and 7, a transmissive liquid crystal light valve is arranged on the square end face of the side length L of each primary color modulation optical path, and the optical path length from the square end face of each primary color modulation optical path to the emission surface 71a is set. The case of 3L is shown.

[Fifth Embodiment]
As shown in the perspective view of FIG. 8 and the five-side view of each member of FIG. 9, the fifth embodiment of the image light synthesizing means 13 includes two a members, four b members, and eight c members. This is a regular hexahedron-shaped four-sided dichroic prism 8 configured in combination.

As shown in the perspective view of FIG. 8, the four-sided dichroic prism 8 has red modulated light R _M and blue modulated light B from four surfaces other than a pair of opposing surfaces having a normal line in the X-axis direction of the regular hexahedron. _M , the short wavelength green modulated light SG _M and the long wavelength green modulated light LG _M are taken in, and the image light IL is emitted from the emission surface which is one of the pair of opposed surfaces.

  The four-plane dichroic prism 8 divides a regular hexahedron into two, a surface 1 whose normal vector direction is (1, 0, −1), and a normal vector direction (1, 0, 1). The plane 2 includes a plane 3 having a normal vector direction (1, -1, 0) and a plane 4 having a normal vector direction (1, 1, 0).

Here, the characteristics of the four-plane dichroic prism 8 will be described with reference to FIG.
Surface 1 reflects the red modulated light R _M incident from the lower surface of the positive hexahedron, it transmits the blue modulated light B _M incident from the upper surface. The surface 2 reflects the blue modulated light B _M incident from the upper surface of the regular hexahedron and transmits the red modulated light R _M incident from the lower surface (FIGS. 10A and 10B).

The surface 3 reflects the short wavelength green modulated light SG _M incident from the back surface having a normal line in the Y-axis direction of the regular hexahedron, and transmits the long wavelength green modulated light LG _M incident from the near surface. To do. The surface 4 reflects the long-wavelength green modulated light LG _M incident from the front surface having a normal to the Y-axis direction of the regular hexahedron, and transmits the short-wavelength green modulated light SG _M incident from the back surface. (FIGS. 10C and 10D).

  The image light projection means 15 is a projection lens 851.

  The image display device 1 according to the present invention further includes a first reflecting mirror 861, a second reflecting mirror 862, a third reflecting mirror 863, a fourth reflecting mirror 864, and four field lenses as four reflecting mirrors. 871, 872, 873, and 874.

  The operation of the image display apparatus according to the present invention will be described below with reference to a perspective view (FIG. 11) showing the arrangement of optical elements.

  In this description, the primary color light emitting means 11 includes a white light emitting means 111 that emits white light W and a white light separating means 112 that separates the white light W into four primary color lights. To do.

  The white light W emitted from the white light source 86 that is the white light emitting unit 111 is converted into red light R, by the first separation dichroic mirror 821 and the second separation dichroic mirror 822 disposed on the optical axis of the white light source 86. Separated into blue light B and green light G. That is, the white light W enters the first separation dichroic mirror 821 and the second separation dichroic mirror 822 along the optical axis.

  The green light G is emitted along the optical axis, the red light R is emitted in a direction perpendicular to the optical axis (for example, downward), and the blue light B is emitted in a direction opposite to the emission direction of the red light R (upward). .

  The green light G emitted from the first separation dichroic mirror 821 and the second separation dichroic mirror 822 is arranged in series with the first separation dichroic mirror 821 and the second separation dichroic mirror 822 on the optical axis of the white light source 86. The third separation dichroic mirror 823 and the fourth separation dichroic mirror 824 are separated into the long wavelength green light LG and the short wavelength green light SG.

  Behind the four-sided dichroic prism 8 is installed a light shielding plate 825 that prevents light transmitted through the third separation dichroic mirror 823 and the fourth separation dichroic mirror 824 from entering the four-sided dichroic prism 8. The

  The long wavelength green light LG is emitted in a direction perpendicular to the optical axis and the emission direction of the red light R, and the short wavelength green light SG is emitted in a direction opposite to the emission direction of the long wavelength green light LG.

  The red light R is transmitted by the first reflecting mirror 861, the blue light B is transmitted by the second reflecting mirror 862, the long wavelength green light LG is transmitted by the third reflecting mirror 863, and the short wavelength green light SG is converted by the fourth reflecting mirror 864. Thus, the light beam becomes parallel to the optical axis of the white light W.

  Red light R, blue light B, long wavelength green light LG, and short wavelength green light SG are red modulated light composed of a reflective liquid crystal light valve 836 and a polarization beam splitter 837 that control the amount of reflected light in accordance with the image signal. The light is incident on the generating unit 831, the blue modulated light generating unit 832, the long wavelength green modulated light generating unit 833, and the short wavelength green modulated light generating unit 834. Note that a transmissive liquid crystal light valve that controls the amount of transmitted light according to an image signal may be used instead of the reflective liquid crystal light valve 836 as the liquid crystal light valve.

  Since the operations of the red modulated light generating unit 831, the blue modulated light generating unit 832, the long wavelength green modulated light generating unit 833, and the short wavelength green modulated light generating unit 834 are the same, the operation of the red modulated light generating unit 831 will be described. .

In other words, the red light R that has reached the red modulated light generation means 831 enters the polarization beam splitter 837, and the reflected polarization component enters the reflective liquid crystal light valve 836. The reflective liquid crystal light valve 836 reflects incident light with a reflectance corresponding to the supplied electrical signal. Light emitted from the reflective liquid crystal light valve 836 is incident on polarizing beam splitter 837, transmitted through the polarized light component is modulated red light R _M.

The red modulated light R _M transmitted through the polarization beam splitter 837 enters the four-plane dichroic prism 8.

The four-plane dichroic prism 8 is emitted from the red modulated light R _M emitted from the red modulated light generating unit 831, the blue modulated light B _M emitted from the blue modulated light generating unit 832, and the long wavelength green modulated light generating unit 833. The long-wavelength green modulated light LG _M and the short-wavelength green modulated light SG _M emitted from the short-wavelength green modulated light generating means 834 are mixed to generate the image light IL.

  The image light IL is projected onto a screen (not shown) via the projection lens 851 and displayed as an image.

  The fifth primary color modulated light can be used by combining the fifth primary color modulated light by entering the fifth primary color modulated light from the back surface of the four-sided dichroic prism 8.

  As described above, the image display device according to the present invention has an effect that it is possible to accurately synthesize four or more primary color modulated lights by an integrated image light synthesizing unit. It is valid.

Block diagram of an image display device according to the present invention The perspective view (N = 5) which shows an example of the hardware constitutions of the image display apparatus which concerns on this invention Top view of first embodiment of image light combining means (N = 4, 5) Top view of second embodiment of image light synthesizing means (N = 4, 5) Top view of third embodiment of image light combining means (N = 7) Perspective view of the fourth embodiment of the image light combining means (N = 5) Four views of the fourth embodiment of the image light combining means (N = 5) A perspective view of the fifth embodiment of the image light combining means Five-sided view of each member of the fifth embodiment of the image light combining means Perspective view of 4-sided dichroic prism The perspective view which shows arrangement | positioning of an optical element Block diagram of a conventional projection color image display device International Illumination Commission chromaticity diagram Block diagram of a conventional projection color image display device

Explanation of symbols

8 Four-sided dichroic prism 11 Primary color light emitting means 12 Primary color modulated light generating means 13 Image light synthesizing means 14 Image light projecting means 21, 31, 41, 51, 61, 71 Image light paths 21a, 31a, 41a, 51a, 61a, 71a Surface 21b, 21c, 41b, 41c, 61b, 61c, 61d, 61e, 61f, 61g, 61h Side surface 31d, 51d, 71f Square end surface 62 Transmission type liquid crystal light valve 71b First side surface 71c Second side surface 71d Third surface Side surface 71e Fourth side surface 111 White light emitting means 112 White light separating means 221, 321, 421, 521, 721 First primary color modulation optical path 222, 322, 422, 522, 722 Second primary color modulation optical path 223, 323, 423, 523, 723 Third primary color modulation optical path 224, 324, 424 524, 724 Fourth primary color modulation optical path 325, 525, 725 Fifth primary color modulation optical path 231, 331, 431, 531, 731 First dichroic mirror 232, 332, 432, 532, 732 Second dichroic mirror 233, 333, 433, 533, 733 Third dichroic mirror 234, 334, 434, 534, 734 Fourth dichroic mirror 631, 632, 633, 634, 635, 636 Dichroic mirror 836 Reflective liquid crystal light valve

Claims (6)

Primary color light emitting means for emitting N (≧ 4) primary color light;
Primary color modulated light generating means for generating primary color modulated light by modulating the primary color light according to an image signal;
Integrated image light combining means for combining the primary color modulated light with image light;
Image light projecting means for projecting the image light,
The image photosynthesis means is
A rectangular column-shaped image light path that emits the image light from an exit surface that is one square end surface;
N primary color modulation optical paths that extend from the side surface of the image optical path, or from the side surface of the image optical path and the other square end surface of the image optical path, each of which propagates the primary color modulation light of one;
An image display device comprising: a dichroic mirror that is formed in the image optical path and reflects the primary color modulated light propagated through the primary color modulated optical path extending from a side surface of the image optical path in the direction of the emission surface. The N primary color modulation light paths extend from a pair of side faces of the image light path, or from a pair of side faces of the image light path and the other square end face of the image light path, and each propagates one primary color modulation light. The image display device according to claim 1, wherein the image display device is a device. Primary color light emitting means for emitting N (≧ 4) primary color light;
Primary color modulated light generating means for generating primary color modulated light by modulating the primary color light according to an image signal;
Integrated image light combining means for combining the primary color modulated light with image light;
Image light projecting means for projecting the image light,
The image photosynthesis means is
A positive (N + 1) prismatic image light path for emitting the image light from an exit surface as one side surface;
An image display device comprising: a dichroic mirror that is formed in the image optical path and reflects the primary color modulated light that has entered from a side other than the exit surface of the image optical path in the direction of the exit surface. The primary color light emitting means emits red light, yellow light, long wavelength green light, short wavelength green light and blue light,
The primary color modulated light generation means modulates the red light, the yellow light, the long wavelength green light, the short wavelength green light, and the blue light according to the image signal, thereby adjusting the red modulated light, yellow modulated light, long It generates wavelength green modulated light, short wavelength green modulated light and blue modulated light,
The image photosynthesis means is
A first primary color modulation optical path that extends from the first side surface of the first position of the image optical path and propagates the red modulated light, and a second adjacent to the first side surface of the second position of the image optical path. A first primary color modulation light path that propagates from the side surface of the light and propagates the blue modulated light, and a yellow color modulation light that extends from the third side surface facing the first side surface at the second position of the image light path. Primary color modulation optical path for propagating light, and fourth primary color modulation for propagating the short wavelength green image light by extending from the fourth side facing the second side of the second position of the image optical path A fifth primary color modulation optical path for propagating the long wavelength green modulated light from the other square end face of the optical path and the image optical path;
A first dichroic mirror that is installed at the first position in the image optical path, reflects the red modulated light in the direction of the emission surface, and transmits the other primary color modulated light; A second dichroic mirror that is installed at a first position, reflects the blue modulated light in the direction of the emission surface, and transmits the other primary color modulated light, and is installed at the second position in the image optical path; A third dichroic mirror that reflects the yellow modulated light in the direction of the exit surface and transmits the other primary color modulated light; and the second wavelength in the image optical path; and the short wavelength green The image display apparatus according to claim 1, further comprising: a fourth dichroic mirror that reflects the modulated light in the direction of the emission surface and transmits the other primary color modulated light. Primary color light emitting means for emitting N (≧ 4) primary color light;
Primary color modulated light generating means for generating primary color modulated light by modulating the primary color light according to an image signal;
Integrated image light combining means for combining the primary color modulated light with image light;
Image light projecting means for projecting the image light,
The primary color light emitting means emits red light, long wavelength green light, short wavelength green light and blue light;
The primary color modulated light generating means modulates the red light, the long wavelength green light, the short wavelength green light, and the blue light according to the image signal, thereby modulating the red modulated light, the long wavelength green modulated light, and the short wavelength green. It generates modulated light and blue modulated light,
The image light combining means takes in the red modulated light, the long wavelength green modulated light, the short wavelength green modulated light, and the blue modulated light from four surfaces other than the pair of opposed surfaces of a regular hexahedron, and the pair of opposed surfaces An image display device, which is one four-sided dichroic prism that emits the image light from one surface of the image display device. The primary color modulated light generating means includes a reflective liquid crystal light valve that controls the amount of reflected light according to the image signal, or a transmissive liquid crystal light valve that controls the amount of transmitted light according to the image signal,
The primary color light emitting means comprises
White light emitting means for emitting white light;
The image display apparatus according to claim 1, further comprising white light separating means for separating the white light into N primary color lights.

Images