JP2008287209A - Illumination device and projection video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination device that enables to effectively secure high luminance for a projection image by a multi-lamp arrangement, while keeping high light use efficiency, and to provide a projection video display device incorporated with the illumination device. <P>SOLUTION: In a plane (X-Z plane in FIG. 2) perpendicular to a propagating direction of the light beams emitted from lamps 101 to 104 after having been reflected by mirrors 111 to 114, a center of an optical axis of a lamp 105 is disposed in an area where a light amount distribution is relatively small. A notch is formed at a traverse position of the light emitted from the lamp 105 in each of the mirrors 111 to 114. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an illumination device and a projection display apparatus, and is particularly suitable for use in an illumination apparatus and a projection display apparatus having a plurality of light sources.

  Along with the recent increase in screen size, in projection-type image display devices (hereinafter referred to as “projectors”), increasing the brightness of illumination light has become a problem. As one of the methods for realizing high brightness, it is conceivable to increase the number of lighting devices. For example, in the following Patent Documents 1 and 2, a four-lamp type illumination device using four lamps as light emitting sources is described.

  In the four-lamp type illumination device, for example, as shown in FIGS. 30A and 30B, mirrors 1 to 4 that reflect light from each lamp in the same direction are arranged together with four lamps 1 to 4. . The lights emitted from the lamps 1 to 4 are reflected so as to be parallel to the optical axis as the illuminating device by mirrors 1 to 4 disposed at an inclination of 45 degrees with respect to the lamp optical axis. In FIG. 4B, the circled hatch shown on each mirror shows the light quantity distribution of the light reflected by each mirror in two stages for convenience, and the hatch is black. The closer it is, the greater the amount of light.

  In this configuration, in order to emit the most light from each lamp as an illuminating device, the plane perpendicular to the optical axis of the illumination system (as shown in FIG. In the plane parallel to each other, it is necessary to arrange each lamp and mirror so that there is no physical loss between the light from each lamp. On the other hand, in consideration of the amount of light taken in by the projection lens, it is preferable that the illumination light is concentrated at a lower dispersion angle. Therefore, as shown in FIGS. It is preferable to make the light from each lamp approach in the optical axis direction of the illumination device so that the amount of light increases.

  However, when the light from each lamp is made to approach the optical axis direction of the lighting device in this way, the portion of the light from each lamp that is not reflected by the corresponding mirror increases, and the light use efficiency decreases. Arise.

  The increase in the amount of illumination light can be realized by increasing the number of lamps (multiple lighting). However, if a large number of lamps are arranged side by side and the number of lamps is increased, the area of the light (irradiation area) emitted from the lighting device increases accordingly. From Etendue theory, the light utilization efficiency decreases as follows. To do.

The value in Etendue theory (Etendue value) is obtained by the product of the beam spread angle (solid angle) and the effective beam area. In FIG. 31A, when the light travels from point A to point B, Etendue value (E) is given by the following equation, where S is the effective area of the light beam at point A and θ is the light spread angle at point A. Calculated by (1).
E = 2πS (1-cosθ) (1)

  In formula (1), 2π (1-cos θ) is the solid angle of the light beam. This Etendue value (E) is calculated in the same manner when light converges as shown in FIG.

  The Etendue value is preserved in the ideal optical system, but in the actual optical system, the Etendue value increases as the light travels. In a projector using a liquid crystal panel, if the Etendue value in the lighting device is smaller than the Etendue value in the panel surface, all the light from the lighting device can be guided to the panel surface, while the Etendue value in the lighting device is The greater the Etendue value at, the lower the light utilization efficiency from the lighting device.

  When the area of the panel surface and the light capture angle are constant, if the light flux area in the lighting device increases, the Etendue value in the lighting device increases accordingly, and the light utilization efficiency (capture amount) on the panel surface decreases. . That is, light incident at a dispersion angle larger than the effective dispersion angle with respect to the liquid crystal panel cannot be taken into the liquid crystal panel.

  Thus, when the luminous flux area in the illuminating device increases, the utilization efficiency of light on the panel decreases accordingly. Therefore, even if the number of lights is increased further by increasing the number of lights, if the luminous flux area of the illuminating device increases, the increased illumination light cannot be taken into the panel effectively and the brightness of the projected image can be increased. Cannot be achieved.

  When the area of the illumination light beam is increased, the convergence angle of the illumination light at the time of incidence on the panel is increased accordingly, and in addition to the above-described problem of light utilization efficiency, the problem of contrast reduction in the projected image occurs. Also from this point, it is necessary to impose certain restrictions on the area expansion of the illumination light beam.

In the following Patent Document 3, a two-lamp type illumination device is described. Further, the following cited document 4 describes a two-lamp illumination device using a triangular prism array as a reflecting means. Furthermore, Patent Document 5 below describes an illumination device using a plurality of solid state light sources (semiconductor lasers).
JP 2002-90877 A JP-A-8-36180 JP-A-6-242397 JP 2001-166274 A JP 2006-93586 A

  It is an object of the present invention to provide an illuminating device that can effectively increase the brightness of a projected image by increasing the number of lamps while maintaining a high light utilization efficiency, and a projection display apparatus incorporating the same.

  In view of the above problems, the present invention has the following features.

  A lighting device according to a first aspect of the present invention includes a first light source unit composed of a plurality of first light sources, a first reflection unit that guides each light emitted from the first light source in the same direction, and at least one The light from the second light source is provided in a region having a second light source and having a relatively small light amount distribution in a plane perpendicular to the traveling direction of the light from the first light source unit after being reflected by the first reflection unit. And a second light source unit configured to have an axial center.

  According to this illuminating device, the center of the optical axis of the second light source is located in a region having a relatively small light amount distribution in a plane perpendicular to the traveling direction of the light from the first light source unit after being reflected by the first reflecting unit. Therefore, it is possible to realize an increase in the amount of light by adding the second light source while suppressing an increase in the area of the irradiated light beam. Therefore, when this illuminating device is mounted on a projection display apparatus, it is possible to increase the amount of light from the illuminating device while maintaining the light capturing efficiency with respect to the panel, effectively increasing the brightness of the projected image. Can be achieved.

  A lighting device according to a second aspect of the present invention includes a first light source unit including four first light sources, and a mirror surface that guides each light emitted from the first light source in the same direction. The first reflection unit disposed so that the optical axis centers of the four light sources are positioned at the apex positions of the predetermined rectangular shapes in a plane perpendicular to the traveling direction of the light from the first light source unit after being reflected. And a second light source disposed so that the center of the optical axis is located at the center position of the square shape.

  According to this illuminating device, the center of the optical axis of the second light source is located in a region having a relatively small light amount distribution in a plane perpendicular to the traveling direction of the light from the first light source unit after being reflected by the first reflecting unit. Therefore, it is possible to realize an increase in the amount of light by adding the second light source while suppressing an increase in the area of the irradiated light beam. Therefore, when this illuminating device is mounted on a projection display apparatus, it is possible to increase the amount of light from the irradiating device while maintaining the light capturing efficiency with respect to the panel, effectively increasing the brightness of the projected image. Can be achieved.

  More specifically, since the light from the second light source is guided to the center position of the square shape in which the light amount cannot be sufficiently secured with only the four first light sources, that is, the center position of the irradiation light beam, the central portion of the irradiation light beam The amount of light can be effectively increased. For this reason, the illumination light can be concentrated at a lower dispersion angle, and the amount of light taken into the projection lens can be increased.

  Other features of the first and second aspects of the invention are as set forth in the corresponding claims. The effects of other features will be clearly understood by reading the description of the following embodiments.

  A third aspect of the invention is a projection display apparatus equipped with the illumination device according to the first and second aspects of the invention. In the projection display apparatus according to the third aspect of the invention, the effects of the illumination apparatus according to the first and second aspects of the invention are exhibited.

  Here, the projection display apparatus according to the third aspect of the invention includes an R light modulation element that modulates light based on a red video signal and a G light that modulates light based on a green video signal. A modulation element, a light modulation element for B that modulates light based on a video signal for blue, and light in the red wavelength band, green wavelength band, and blue wavelength band among the light emitted from the illumination device, respectively Photosynthesis for synthesizing light of each wavelength band modulated by each of the light modulation elements and a light guiding optical system guided to the light modulation element, the light modulation element for G and the light modulation element for B, and video light An element, light superimposing means for superimposing light in a fourth wavelength band other than the wavelength bands among the light emitted from the illumination device on the image light, and a fourth for modulating light in the fourth wavelength band. And a light modulation element. In this way, since the fourth wavelength band is superimposed on the image light, it is possible to further increase the brightness of the projected image. Further, the color reproduction range of the projected image can be adjusted by modulating the light in the fourth wavelength band by the fourth light modulation element.

  A projection display apparatus according to a third aspect of the invention includes a light guide optical system that separates light emitted from the illumination device into color component light and guides the light to a corresponding light modulation element, and the light guide optical system. In addition, the incident light amount of the light in the second wavelength band on the light modulation element is reduced by acting on the light in the second wavelength band other than the first wavelength band in which the single color purity of the color component light is high. It can also comprise so that it may have the light quantity adjustment means to adjust. In this way, the brightness and color reproduction range of the projected image can be appropriately adjusted by adjusting the amount of light incident on the light modulation element in the second wavelength band.

  As described above, according to the present invention, there is provided an illuminating device capable of effectively increasing the brightness of a projected image by increasing the number of lamps while maintaining a high light utilization efficiency, and a projection display device incorporating the same. be able to.

  The effects and significance of the present invention will become more apparent from the following description of embodiments. However, the following embodiment is merely an example when the present invention is implemented, and the meaning of the term of the present invention or each constituent element is limited to that described in the following embodiment. Is not to be done.

Embodiments of the present invention will be described below with reference to the drawings.
(Five-lamp configuration)

  In this embodiment, the illumination device according to the present invention is applied to a projector.

  FIG. 1 shows an optical system of a projector according to the first embodiment. In the figure, reference numeral 10 denotes an illumination device having five lamps 101 to 105. The lamps 101 to 105 are an ultrahigh pressure mercury lamp, a metal halide lamp, a xenon lamp, or the like. Light from the lamps 101 to 105 is emitted as substantially parallel light by the action of the reflector. The configuration of the illumination device 10 will be described later with reference to FIG.

  Light from the illumination device 10 enters a PBS (polarized beam splitter) array 12 and a condenser lens 13 via an integrator 11. The integrator 11 includes first and second integrator lenses made up of a ridge-like lens group, and is incident from the illumination device 10 so that the light quantity distribution when entering the liquid crystal panels 18, 24, 33 is uniform. A lens action is given to the light. The PBS array 12 includes a plurality of PBSs and half-wave plates arranged in an array, and aligns the polarization direction of light incident from the integrator 11 in one direction. The condenser lens 13 imparts a condensing function to the light incident from the PBS array 13. The light transmitted through the condenser lens 13 enters the dichroic mirror 14.

  The dichroic mirror 14 transmits only the light in the red wavelength band (hereinafter referred to as “R light”) out of the light incident from the condenser lens 13, and the light in the blue wavelength band (hereinafter referred to as “B light”). Reflects light in the green wavelength band (hereinafter referred to as “G light”). The R light transmitted through the dichroic mirror 14 is reflected by the mirror 15 and enters the condenser lens 16.

  The condenser lens 16 imparts a lens action to the R light so that the R light enters the liquid crystal panel 18 as substantially parallel light. The R light transmitted through the condenser lens 16 is incident on the liquid crystal panel 18 via the incident side polarizing plate 17. The liquid crystal panel 18 is driven according to the red video signal and modulates the R light according to the driving state. The R light modulated by the liquid crystal panel 18 is incident on the dichroic prism 20 via the emission side polarizing plate 19.

  Of the light reflected by the dichroic mirror 14, G light is reflected by the dichroic mirror 21 and enters the condenser lens 22. The condenser lens 22 imparts a lens action to the G light so that the G light enters the liquid crystal panel 24 as substantially parallel light. The G light transmitted through the condenser lens 22 is incident on the liquid crystal panel 24 through the incident side polarizing plate 23. The liquid crystal panel 24 is driven according to the green video signal and modulates the G light according to the driving state. The G light modulated by the liquid crystal panel 24 is incident on the dichroic prism 20 via the output side polarizing plate 25.

  The B light transmitted through the dichroic mirror 21 is incident on the condenser lens 26. The condenser lens 26 imparts a lens action to the B light so that the B light enters the liquid crystal panel 33 as substantially parallel light. The B light transmitted through the condenser lens 26 travels on an optical path composed of relay lenses 27, 29, 31 for adjusting the optical path length and two mirrors 28, 30, and is incident on the liquid crystal panel 33 via the incident side polarizing plate 32. . The liquid crystal panel 33 is driven according to the blue video signal, and modulates the B light according to the driving state. The B light modulated by the liquid crystal panel 33 is incident on the dichroic prism 20 via the emission side polarizing plate 34.

  The dichroic prism 20 color-combines the R light, G light, and B light modulated by the liquid crystal panels 18, 24, and 33, and enters the projection lens 35. The projection lens 35 includes a lens group for forming an image of projection light on the projection surface, and an actuator for adjusting a zoom state and a focus state of the projection image by displacing a part of the lens group in the optical axis direction. It has. The color image light synthesized by the dichroic prism 20 is enlarged and projected on the screen by the projection lens 35.

  Next, the configuration of the illumination device 10 will be described with reference to FIG. FIGS. 4A and 4B are a top view and a front view of the illumination device 10, respectively. In FIG. 5B, the mirrors 111 to 114 are indicated by broken lines so that the lamp 105 can be seen through.

  As illustrated, the illumination device 10 includes five lamps 101 to 105 and four mirrors 111 to 114. Among these, the lamps 101 to 104 are arranged such that the emission direction is in the X-axis direction in FIG. In addition, the arrangement positions of the lamps 101 and 102 and the lamps 103 and 104 are shifted by a certain distance in the Z-axis direction in FIG.

  Light emitted from the lamps 101 to 104 is reflected in the same direction (Y-axis direction) by the mirrors 111 to 114, respectively. The mirrors 111 to 114 have a rectangular shape with one apex angle notched (pentagon), and the notch position is the optical axis of the illumination device 10 as shown in FIG. It is arranged so as to be positioned at the center position. A lamp 105 is arranged so that light passes through the notch position. The emission direction of the lamp 105 is a direction (Y-axis direction) orthogonal to the emission directions of the lamps 101 to 104.

  The optical axes of the lamps 101 to 104 are bent 90 ° by mirrors 111 to 114. The optical axes (hereinafter referred to as “irradiation optical axes”) of the lamps 101 to 104 after being bent are positioned at the apex position of a square shape, for example. The lamp 105 is arranged so that the optical axis passes through the center of this square shape (the optical axis center of the illumination device 10).

  As the irradiation optical axis of the lamps 101 to 104 approaches the optical axis center of the illuminating device 10, the amount of light near the optical axis center increases and the amount of light taken into the projection lens 35 increases. However, on the other hand, when the irradiation optical axis of the lamps 101 to 104 is brought close to the center of the optical axis of the illuminating device 10, the amount of light incident on the notches of the mirrors 111 to 114 out of the light from the lamps 101 to 104 is increased. It increases and the utilization efficiency of the light from the lamps 101-104 falls. That is, there is a trade-off between the amount of light taken into the projection lens 35 and the utilization efficiency of light from the lamps 101 to 104 when the irradiation optical axes of the lamps 101 to 104 are brought close to the optical axis center of the illumination device 10. There is an off relationship. The lamps 101 to 104 and the mirrors 111 to 114 are arranged at optimum positions in consideration of the trade-off relationship.

  FIG. 3 is a diagram for explaining a modification example of the mirrors 111 to 114. The configuration of the mirrors 111 to 114 described above is shown in FIG. In the figure, for the sake of convenience, there are gaps between the mirrors, but in reality, the mirrors are arranged without gaps. This also applies to other drawings.

  In the modified example shown in FIG. 5B, the cutouts of the mirrors 111 to 114 are arcuate. In this modified example, since the rate at which the light from the lamp 105 is blocked by the mirrors 111 to 114 decreases, the utilization efficiency of the light from the lamp 105 can be increased.

  In the modified example of FIG. 5C, light transmitting portions 111a to 114a are formed in the mirrors 111 to 114 in place of the notches. In this modified example, the mirrors 111 to 114 have a rectangular shape, and portions corresponding to the notches in FIG. 5A are light transmitting portions 111a to 114a having no mirror surface.

  In the modified example of FIG. 4D, the light transmission parts 111a to 114a are further fan-shaped. In this way, the light use efficiency from the lamp 105 can be increased as in the case of FIG.

  Next, with reference to FIG. 4, lighting control of the lighting device 10 will be described.

  FIG. 4 is a view of the mirrors 111 to 114 as viewed from the front of the irradiation device 10. In each mirror region of the mirrors 111 to 114, for convenience, an outer peripheral region having a low light intensity and an inner peripheral region having a high light intensity among the reflected light from the mirrors 111 to 114 are divided into two circular regions. Yes. The notch region at the center is also shown by dividing the light from the lamp 105 into an outer region having a low light intensity and an inner peripheral region having a high light intensity divided into a square region and a circular region. The amount of light in each region during lamp emission is higher as the hatch is closer to black. When the lamp is not emitting light, each area is white without being hatched.

  Compared to the case where all the five lamps 101 to 105 are turned on (see (e) in the same figure), when only one of the lamps other than the center is turned off, there is unevenness in the amount of light on the liquid crystal panels 18, 24, 33. There is a possibility that it will occur. Therefore, in the lighting control, control for turning off only one of the lamps other than the center is not performed, and when all the lights are not turned on, any one of the lighting patterns shown in FIGS. .

  When the projector is used for always-on applications, for example, in the standby mode in which the user does not watch the projected image, only the central lamp 105 is turned on (see FIG. 5A). Either lighting of the lamp (see (b) in the figure), lighting of three diagonal lamps (see (c) in the figure), lighting of four surrounding lamps (see (d) in the figure), or full lighting (see (e) in the figure) In this lighting state, the lamps 111 to 115 are turned on. In this case, for example, when the central one lamp lighting and the diagonal two lamp lighting are alternately switched in the standby mode and the normal use mode, it is possible to avoid a situation in which one lamp continues to be lit over each mode. Can extend the lifetime of

  In addition, the illuminating device 10 in a present Example can also be changed into a hybrid illumination system. FIG. 5A is a configuration example (top view) when the lamp 105 is replaced with a solid light source such as a laser light source. The mirrors 111 to 114 have any of the configurations shown in FIGS.

  In the configuration example of FIG. 5A, illumination light with high color purity can be obtained by replacing the lamp 105 with the solid light source 121. For example, when the emission spectra of the lamps 101 to 104 are shifted to the short wavelength side, the red purity of the illumination light can be increased by arranging the solid light source 121 that emits light in the red wavelength band.

  In the hybrid illumination system, as shown in FIG. 5B, the lamps 101 to 104 can be replaced with solid light sources 131 to 134. In this case, the light amount of the solid light sources 131 to 134 can be supplemented by the light amount of the lamp 105, and a high amount of illumination light can be obtained.

  5A and 5B, the number of the solid light sources 121 is not necessarily one, and two or more solid light sources may be appropriately combined in order to secure the light amount.

  FIG. 6 is a diagram illustrating a configuration example when the output of the lamp is changed. In this configuration example, the central lamp 105 is replaced with a low-power lamp 145. In this case, the aperture of the light emitted from the lamp 145 can be reduced, and the use efficiency of the light from the lamps 101 to 104 can be increased accordingly.

  Further, as shown in FIG. 7, the central lamp 105 can be replaced with a high-power lamp 155. In this case, the amount of light in the vicinity of the optical axis center of the illumination device 10 can be increased, and the amount of light taken into the projection lens 35 can be increased.

  As described above, according to the present embodiment, the light amount distribution is relatively in a plane (XZ plane in FIG. 2) perpendicular to the traveling direction of the light from the lamps 101 to 104 after being reflected by the mirrors 111 to 114. Since the center of the optical axis of the lamp 105 is arranged in a small region, it is possible to realize an increase in light quantity by adding the lamp 105 while suppressing an increase in the area of the irradiated light beam. Therefore, in the projector shown in FIG. 1, the amount of light from the irradiation device 10 can be increased while maintaining the light capturing efficiency with respect to the liquid crystal panels 18, 24, and 33, and the brightness of the projected image is effectively increased. can do.

  In the present embodiment, since the light from the lamp 105 is guided to the center position of the irradiation light beam, in which the light amount cannot be sufficiently secured only by the four lamps 101 to 104, the light amount at the central portion of the irradiation light beam is effectively increased. Can do. For this reason, the illumination light can be concentrated at a lower dispersion angle, and the amount of light taken into the projection lens 105 can be increased. Thereby, it is possible to effectively achieve high brightness of the projected image.

  Further, in this embodiment, since the area of the irradiated light beam does not change from the case where only the four lamps 101 to 104 are arranged, the light convergence angle when entering the liquid crystal panels 18, 24, 33 does not increase. Therefore, the contrast of the projected image does not deteriorate as compared with the case where only the four lamps 101 to 104 are arranged.

As described above, according to the present embodiment, it is possible to effectively increase the brightness of the projected image by adding the lamp while maintaining the light use efficiency, and at the same time, suppress the deterioration of the contrast in the projected image. Can do.

  In the first embodiment, the lamps 101 to 105 are arranged so that the optical axis of the lamp 105 is orthogonal to the optical axes of the lamps 101 to 104. However, when the optical axes of the lamps are not parallel to each other in this way, there is a problem that the arrangement pattern of the illumination device 10 is restricted and the usage form of the projector is also restricted at the same time.

  For example, in the configuration of the first embodiment, when the lighting device 10 is arranged so that the XZ plane of FIG. 2 is parallel to the ground, the lamp 105 is directed vertically to the ground. The service life of the battery is significantly reduced. Therefore, in the configuration of the first embodiment, the illumination device 10 cannot be arranged in this way, and the usage mode of the projector is limited accordingly.

  In the present embodiment, the lamps 101 to 105 are arranged so that the optical axes are all parallel to each other, thereby solving the above-described problem.

  FIG. 8 is a diagram illustrating a configuration example of the illumination device 10 according to the present embodiment. In FIG. 4B, only the configuration of the mirrors 111 to 115 is shown for convenience, and the lamps 101 to 105 are not shown.

  As shown in the figure, the lamps 101 to 105 are all arranged so that the emission direction is in the X-axis direction in the figure. As in the first embodiment, the arrangement positions of the lamps 101 and 102 and the lamps 103 and 104 are shifted by a certain distance in the Z-axis direction in FIG.

  Light emitted from the lamps 101 to 105 is reflected in the same direction (Y-axis direction) by the mirrors 111 to 115, respectively. Like the first embodiment, the mirrors 111 to 114 have a rectangular shape with one apex angle cut out (pentagon), and as shown in FIG. Are positioned so as to be positioned at the center of the optical axis of the illumination device 10. The mirror 115 is arranged so that the reflected light of the light from the lamp 105 passes through the notch position.

  The optical axes of the lamps 101 to 104 are bent 90 ° by mirrors 111 to 114. The optical axes of the lamps 101 to 104 after being bent are positioned, for example, at the apex position of a square shape as in the first embodiment. The mirror 115 is arranged so that the optical axis of the lamp 105 passes through the center of the square shape (the optical axis center of the illumination device 10).

  FIG. 9 is a diagram illustrating another configuration example of the illumination device 10 according to the present embodiment. Similarly to FIG. 8B, FIG. 9B shows only the configuration of the mirrors 111 to 115 for the sake of convenience, and the lamps 101 to 105 are not shown.

  Unlike the case of FIG. 8, in the configuration example of FIG. 9, the lamp 105 and the mirror 115 are arranged in front of the lamps 101 to 104 and the mirrors 111 to 114. In this configuration example, the mirrors 111 to 114 do not necessarily have a shape (pentagon) as in the case of FIG. 8, and may be a simple square shape. In this case, light in the vicinity of the optical axis center of the illumination device 10 among the light reflected by the mirrors 101 to 104 is blocked by the mirror portion 115 a of the mirror 115. The light of the lamp 105 reflected by the mirror 115a is guided near the center of the optical axis of the illumination device 10. The mirror 115 has a mirror portion 115a at the center, and the outside of the mirror portion 115a is transparent.

According to the present embodiment, since the lamps 101 to 105 are arranged so that the optical axes are all parallel, the illuminating device 10 so that the XZ plane (see FIG. 8 or FIG. 9) is parallel to the ground. Even if is arranged, any of the lamps 101 to 105 does not face the vertical direction with respect to the ground. Therefore, compared with the structure of the said Example 1, the arrangement pattern of the illuminating device 10 can be increased, and the usage form of a projector can be expanded by that much.

  In the first and second embodiments, the lamps 101 and 103 and the lamps 102 and 104 are arranged so that the emission directions are opposite. In this embodiment, the lamps 101 to 103 are arranged so that the emission directions are the same. 104 is arranged.

  FIG. 10 is a diagram illustrating a configuration example of the illumination device 10 according to the present embodiment. In addition, the left view of the illuminating device 10 is shown by the figure (b), and the mirror 116 is shown with the broken line so that the lamps 101-104 can be seen through.

  As illustrated, the lamps 101 to 104 are all arranged on the same plane (YZ plane) so as to face the same direction (X-axis direction). Light emitted from the lamps 101 to 104 is reflected by the single mirror 116 in the same direction (Y-axis direction). A square-shaped transparent region (non-mirror region) 116a is formed at the center of the mirror 116, and the lamp 105 is disposed so that light passes through the transparent region 116a. The emission direction of the lamp 105 is a direction (Y-axis direction) orthogonal to the emission directions of the lamps 101 to 104.

  FIG. 11 is a diagram illustrating another configuration example of the illumination device 10 according to the present embodiment. Like FIG.10 (b), the left view of the illuminating device 10 is shown by FIG.11 (b), and the mirrors 116 and 117 are shown with the broken line so that the lamps 101-104 can be seen through. Yes.

  Unlike the case of FIG. 10, in the configuration example of FIG. 11, the lamp 105 and the mirror 117 are arranged on the upstream side of the lamps 101 to 104 and the mirror 116. Further, the transparent region 116a is not formed at the center of the mirror 116, and the entire surface of the mirror 116 is a mirror surface.

  In this case, light in the vicinity of the optical axis center of the illumination device 10 among the light reflected by the mirror 116 is blocked by the mirror unit 117 a of the mirror 117. In the vicinity of the center of the optical axis of the illumination device 10, the light of the lamp 105 reflected by the mirror unit 117a is guided. The mirror 117 has a mirror portion 117a at the center, and the outside of the mirror portion 117a is transparent.

According to the present embodiment, the lamps 101 to 104 are all arranged on the same plane (YZ plane) so as to face the same direction (X-axis direction). The dimension of the illumination device 10 in the X-axis direction can be reduced. Further, since one mirror 116 is used as means for reflecting the light from the lamps 101 to 104, the configuration can be simplified and the number of parts can be reduced. Furthermore, in the configuration example of FIG. 11, since the optical axes of the lamps 101 to 105 are all parallel, the arrangement pattern of the illumination device 10 or the usage form of the projector can be expanded as in the case of the second embodiment.

  In this embodiment, one or more lenses are arranged in an optical path through which light emitted from the lamp 105 passes, and the aperture of the light from the lamp 105 is narrowed.

  FIGS. 12A and 12B are diagrams illustrating a configuration example of the illumination device 10 according to the present embodiment, respectively. The figure (a) is a structural example in the case of arrange | positioning a lens in the illuminating device 10 which concerns on Example 1, The same figure (b) is a structural example in the case of arrange | positioning a lens in the illuminating device 10 which concerns on Example 2. is there.

  As illustrated, in these configuration examples, a convex lens 118a and a concave lens 118b are disposed in an optical path through which light emitted from the lamp 105 passes. The diameter of the light from the lamp 105 is reduced by the convex lens 118a, and further returned to substantially parallel light by the concave lens 118b.

  According to these configuration examples, the aperture of the light from the lamp 105 is reduced by the convex lens 118a and the concave lens 118b, so that the notches of the mirrors 111 to 114 can be reduced. Therefore, the utilization efficiency of light from the lamps 101 to 104 can be increased.

(N-light configuration)
In each of the embodiments described above, the five lamps 101 to 105 are arranged in the lighting device 10, but the number of lamps is not limited to five, and other numbers of lamps are arranged in the lighting device 10. You can also. However, if the number of lamps is increased, the amount of illumination light can be increased accordingly. On the other hand, however, the number of parts or the cost is increased. The issue of increasing the size of the system will emerge. Further, when the number of lamps is reduced, the number of parts or the cost can be reduced accordingly, and the lighting device can be reduced in size. However, there is a problem that the amount of illumination light is reduced.

Below, the structural example (Examples 5-7) in the case of changing the number of lamps is shown.

  In this embodiment, the number of lamps is reduced from five to four.

  FIG. 13 is a diagram illustrating a configuration example of the illumination device 10 according to the present embodiment. In FIG. 4B, only the configuration of the mirrors 211 to 213 is shown for convenience, and the lamps 201 to 204 are not shown.

  As shown in the figure, the lamps 201 to 203 are arranged such that the emission direction is in the X-axis direction in the figure. In addition, the arrangement positions of the lamps 201 and 202 and the lamp 203 are shifted by a certain distance in the Z-axis direction in FIG.

  Light emitted from the lamps 201 to 203 is reflected in the same direction (Y-axis direction) by the mirrors 211 to 213, respectively. The mirrors 211 and 212 have a rectangular shape with one apex angle notched (pentagon), and the notch position is the optical axis of the illumination device 10 as shown in FIG. It is arranged so as to be positioned at the center position. A lamp 204 is arranged so that light passes through the notch position. The emission direction of the lamp 204 is a direction (Y-axis direction) orthogonal to the emission directions of the lamps 201 to 203.

  According to the present embodiment, since the number of lamps is reduced by one, the number of parts or the cost can be reduced as compared with the first embodiment, and the lighting device can be downsized. However, in the present embodiment, the amount of illumination light is lower than that in the first embodiment, as much as the number of lamps is reduced.

In the configuration example of FIG. 13, the optical axis of the lamp 204 is orthogonal to the optical axes of the lamps 201 to 203. However, as in the case of the second embodiment, by separately providing a mirror, the lamps 201 to 201 are arranged. The lamp 204 may be arranged so that the optical axis is parallel to the optical axis 203.

  In this embodiment, the number of lamps is increased from five to seven.

  FIG. 14 is a diagram illustrating a configuration example of the illumination device 10 according to the present embodiment. In FIG. 5B, only the configuration of the mirrors 311 to 316 is shown for the sake of convenience, and the lamps 301 to 307 are not shown.

  As shown in the figure, the lamps 301 to 306 are arranged such that the emission direction is in the X-axis direction in the figure. In addition, the arrangement positions of the lamps 301 and 302, the lamps 303 and 304, and the lamps 305 and 306 are shifted by a certain distance in the Z-axis direction in FIG.

  Light emitted from the lamps 301 to 306 is reflected in the same direction (Y-axis direction) by the mirrors 311 to 316, respectively. The mirrors 311, 312, 315, and 316 have a rectangular shape with one apex angle notched (pentagon), and the notch position is an illumination device as shown in FIG. 10 are arranged so as to be positioned at the center of the optical axis. A lamp 307 is arranged so that light passes through the notch position. The emission direction of the lamp 307 is a direction (Y-axis direction) orthogonal to the emission directions of the lamps 301 to 306.

According to the present embodiment, since the number of lamps is increased by two, the amount of illumination light can be increased as compared with the first embodiment. However, since the number of lamps and the number of mirrors each increase by two, the cost increases accordingly, and the lighting device increases in size.

  In this embodiment, the number of lamps is increased from five to eight.

  FIG. 15 is a diagram illustrating a configuration example of the illumination device 10 according to the present embodiment. In FIG. 4B, only the configuration of the mirrors 311 to 318 is shown for the sake of convenience, and the lamps 301 to 308 are not shown.

  As shown in the figure, the lamps 301 to 308 are arranged such that the emission direction is in the X-axis direction in the figure. The arrangement positions of the lamps 301 and 302, the lamps 303 and 304, and the lamps 305 and 306 are shifted by a certain distance in the Z-axis direction in FIG. In addition, the arrangement positions of the lamps 307 and 308 are also shifted by a certain distance in the Z-axis direction with respect to the other lamps.

  Light emitted from the lamps 301 to 308 is reflected in the same direction (Y-axis direction) by the mirrors 311 to 318, respectively. The mirrors 311, 312, 315, and 316 have a rectangular shape with one apex angle notched (pentagon), and the mirrors 313 and 314 have two rectangular apex angles that are notched. Shape (pentagon). These mirrors are arranged so that their notch positions face each other, as shown in FIG. Mirrors 317 and 318 are arranged so that the reflected light from the lamps 308 and 307 passes through the notch positions, respectively.

According to the present embodiment, since the number of lamps is increased by two, the amount of illumination light can be increased as compared with the first and second embodiments. However, since the number of lamps and the number of mirrors increase, the cost increases correspondingly, and the lighting device increases in size. In the configuration example of FIG. 15, since the optical axes of the lamps 301 to 308 are all parallel, the arrangement pattern of the illumination device 10 or the usage form of the projector can be expanded as in the case of the second embodiment.

  In this embodiment, a prism array is used instead of a mirror to guide light from a lamp to an illumination system. A prism array described in WO2004 / 088413 can be used.

  FIG. 16 is a diagram illustrating a configuration example of the illumination device 10 according to the present embodiment. As illustrated, the illumination device 10 includes five lamps 401 to 405 and two prism arrays 411 and 412. Among these, the lamps 401 to 404 are arranged so that light is incident on the prism arrays 411 and 412 from an oblique direction. Further, the arrangement positions of the lamps 401 and 402 and the lamps 403 and 404 are deviated by a certain distance in the Z-axis direction in FIG.

  The lights emitted from the lamps 401 to 404 are reflected in the same direction (Y-axis direction) by the corresponding prism arrays 411 and 412 respectively. The prism arrays 411 and 412 have notches 411a and 412a each having a rectangular shape at the center of one side of the square shape, and these notches 411a and 412a are illuminated as shown in FIG. The device 10 is disposed so as to be positioned at the center position of the optical axis. A lamp 405 is arranged so that light passes through these notches 411a and 412a. The emission direction of the lamp 405 is a direction (Y-axis direction) orthogonal to the emission directions of the lamps 401 to 404.

  FIG. 17 is a diagram illustrating another configuration example of the illumination device 10 according to the present embodiment.

  As illustrated, the illumination device 10 includes six lamps 401 to 406, two prism arrays 431 and 432, and two mirrors 433 and 434. Among these, the lamps 401 to 404 are arranged so that light enters the prism arrays 431 and 432 from an oblique direction. In addition, the arrangement positions of the lamps 401 and 402, the lamps 403 and 404, and the lamps 405 and 406 are shifted by a certain distance in the Z-axis direction in FIG.

  Light emitted from the lamps 401 to 404 is reflected in the same direction (Y-axis direction) by the corresponding prism arrays 431 and 432, respectively. Light emitted from the lamps 405 and 406 is reflected in the same direction (Y-axis direction) by the mirrors 433 and 434, respectively.

The prism arrays 431 and 432 are arranged so that a gap of a constant distance is generated in the Z-axis direction as shown in FIG. 5B, and the lamps 405 and 406 pass the reflected light through the gap. 405 and 406 and mirrors 433 and 434 are arranged.

  In the configuration example shown in FIG. 1, R light, G light, and B light are modulated by the corresponding liquid crystal panels, synthesized by the dichroic prism 20, and projected onto the projection surface by the projection lens 35. Here, light in the yellow wavelength band (hereinafter referred to as “Ye light”) is cut, and R light, G light, and B light are combined by the dichroic prism 20 to be image light. However, if the Ye light that has been cut in this configuration example is effectively superimposed on the image light, the brightness can be further increased. That is, by combining the illuminating device 10 shown in the first to eighth embodiments and the optical system that further superimposes the Ye light on the image light, it is possible to make the brightness of the image light more remarkable.

  FIG. 18 is a diagram showing a general characteristic tendency of the light amount and specific luminous efficiency of the lamp. In the figure, the wavelength bands separated by dotted lines are the wavelength bands of B light, G light, Ye light, and R light, respectively. Further, the diagram labeled “light source” is a characteristic curve of wavelength versus energy value.

  As shown in the figure, the light quantity of the lamp has peaks in the wavelength band of G light and the wavelength band of Ye light. The relative luminous sensitivity of the light emitted from the lamp has a peak in the wavelength band of G light, and the relative luminous sensitivity gradually decreases as the distance from the wavelength band of G light increases. From this characteristic diagram, it can be understood that the luminance of the projected image can be significantly increased by superimposing Ye light on video light in addition to R light, G light, and B light.

  Hereinafter, a configuration example of the optical system when the Ye light is superimposed on the video light will be described. In the configuration example shown below, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the following configuration example, a five-lamp illumination device shown in FIG. 8 is used as the illumination device 10. However, the illuminating device to be applied is not limited to that shown in FIG. 8, and other illuminating devices shown in the above-described embodiments can of course be used instead. In the following configuration example, a slight improvement is added to the configuration of the illumination device 10 compared to the configuration in FIG.

<Configuration example 1>
FIG. 19 shows a configuration of a projector according to Configuration Example 1.

  First, the illumination device 10 will be described. As described above, in this configuration example, the five-lamp illumination device illustrated in FIG. 8 is used as the illumination device 10. However, in this case, UV cut filters 121 to 125 and an aperture 126 are added as compared with those in FIG.

  The UV cut filters 121 to 125 are disposed near the exits of the lamps 101 to 105, respectively, and remove ultraviolet light contained in the light emitted from the lamps 101 to 105. The ultraviolet light is unnecessary light that is not superimposed on the image light, and has a short wavelength, and thus tends to adversely affect optical components. Therefore, in the configuration example of FIG. 19, unnecessary UV light is removed by the UV cut filters 121 to 125.

  The aperture 126 adjusts the shape of the light emitted from the lamp 105 so that the light from the lamp 105 does not hit the back surface of the mirrors 111, 112, 113, and 114. When the aperture 126 is not provided, the light from the lamp 105 is reflected by the back surfaces of the mirrors 111, 112, 113, and 114 and enters one of the lamps, which may cause a reduction in the life of the lamp. Accordingly, in the configuration example of FIG. 19, the aperture 126 prevents unnecessary light reflected by the back surfaces of the mirrors 111, 112, 113, and 114 from entering the lamp. Instead of arranging the aperture 126 in this way, antireflection means (antireflection film, etc.) may be arranged on the back surface of the mirrors 111, 112, 113, 114.

  Next, the configuration from the integrator 11 to the projection lens 35 will be described. In this configuration example, condenser lenses 41 and 42, a UV cut filter 44, optical compensation plates 46, 50, and 53, and a Ye superimposing element 48 are added, and the dichroic mirror 43 and the incident side are compared with the configuration of FIG. The polarizing plates 45, 49, and 52 and the emission side polarizing plates 47, 51, and 54 are changed.

  Here, the dichroic mirror 43 is changed to reflect G light and Ye light and transmit B light. Moreover, the incident side polarizing plates 45, 49, and 52 and the outgoing side polarizing plates 47, 51, and 54 each have a two-layer configuration. The reason for using two polarizing plates in this way is to prevent damage to the polarizing plate.

  That is, in the present embodiment, as described above, the amount of light emitted from the illumination device 10 is considerably high, and therefore, the light incident upon the polarizing plates disposed before and after the liquid crystal panels 18, 24, 33. The amount of light also increases. As described above, when the amount of light incident on the polarizing plate is large, the amount of light absorbed at the time of transmitting through the polarizing plate is large, and a large amount of heat is generated by this absorption. Therefore, if one polarizing plate is used, there is a possibility that the polarizing plate is damaged by this heat generation. In particular, in a polarizing plate that transmits B light having a short wavelength, the amount of heat generation becomes considerably large, and the possibility of damage to the polarizing plate increases. Therefore, in order to avoid this, in this configuration example, two incident side polarizing plates 45, 49, 52 and two outgoing side polarizing plates 47, 51, 54 are configured to prevent the polarizing plate from being damaged by heat generation. is doing.

  Specifically, of the two polarizing plates constituting the incident side polarizing plates 45, 49, 52 and the outgoing side polarizing plates 47, 51, 54, polarization is performed by the polarizing plate far from the dichroic prism 20. The direction is roughly aligned, and the polarization direction is finely aligned by the polarizing plate closer to the dichroic prism 20. Thereby, the heat generation in the polarizing plate is dispersed, and the polarizing plate is prevented from being damaged.

  In addition, the R-light incident side polarizing plate 45 and the B light incident-side polarizing plate 52 have half-wave plates (not shown) that rotate the polarization directions of the R light and B light by 90 degrees, respectively. It is provided. Thereby, the R light and the B light are incident on the reflecting surface of the dichroic prism 20 as S-polarized light, and the reflection efficiency of the R light and the B light at the dichroic prism 20 is increased. Note that the incident-side polarizing plate 49 for G light (and Ye light) is not provided with a half-wave plate. For this reason, the G light (and Ye light) is incident on the reflecting surface of the dichroic prism 20 as P-polarized light, and the transmission efficiency of the G light (and Ye light) in the dichroic prism 20 is increased.

  In the configuration of FIG. 19, light emitted from the illumination device 10 is incident on the dichroic mirror 14 via the integrator 11, the PBS array 12, and the condenser lens 13. Of this light, R light is transmitted through the dichroic mirror 14, and light other than the R light is reflected by the dichroic mirror 14. The R light that has passed through the dichroic mirror 14 is incident on the dichroic prism 20 via an optical element from the condenser lens 41 to the output side polarizing plate 47.

  The light reflected by the dichroic mirror 14 enters the dichroic mirror 43 via the condenser lens 42. Of the incident light, the dichroic mirror 43 transmits B light and reflects G light and Ye light. The B light transmitted through the dichroic mirror 43 is incident on the dichroic prism 20 through an optical element from the condenser lens 26 to the output side polarizing plate 54. At this time, UV light that has not been removed by the UV cut filters 121 to 125 in the illumination device 10 is removed by the UV cut filter 44.

  The G light and Ye light reflected by the dichroic mirror 43 enter the Ye superimposing element 48. The Ye superimposing element 48 acts only on the Ye light of the G light and the Ye light, and rotates the polarization direction of the Ye light according to the applied voltage. Thereby, the amount of Ye light superimposed on the video light is adjusted. The superposition effect of Ye light by the Ye superposition element 48 will be described later with reference to FIG.

  The G light and Ye light that have passed through the Ye superimposing element 48 are incident on the dichroic prism 20 through optical elements from the condenser lens 22 to the exit side polarizing plate 51.

  The R light, G light, Ye light, and B light incident on the dichroic prism 20 are combined by the dichroic prism 20 to be image light. This image light is projected onto the projection surface (screen surface) via the projection lens 35.

  FIG. 20 shows the color reproduction range in the case of using this configuration example in the XYZ color system. As shown in the figure, the range that can be reproduced by the R light, G light, and B light is a range indicated by oblique lines on the pigment coordinates. In contrast, Ye light is light that can reproduce colors outside the range that can be reproduced by R light, G light, and B light. Therefore, as in this configuration example, by superimposing Ye light on video light, it is possible to widen the color reproducible range at the same time as increasing the brightness of the projected image.

  Next, with reference to FIG. 21, the superposition effect | action of Ye light by the Ye superimposition element 48 is demonstrated. Double-directional arrows in the figure are the polarization directions of the G light and Ye light.

  FIG. 21A shows a state where no voltage is applied to the Ye superimposing element 48. In this case, of the G light and Ye light incident on the Ye superimposing element 48, only the Ye light is subjected to the rotating action of the polarization direction from the Ye superimposing element 48, and the polarization direction is rotated by 90 degrees. Therefore, the polarization directions of the G light and Ye light after passing through the Ye superimposing element 48 are orthogonal to each other as shown in FIG.

  FIG. 21B shows a state when a predetermined level of voltage is applied to the Ye superimposing element 48. In this case, the Ye light is rotated by the Ye superimposing element 48 until the polarization direction matches the polarization direction of the G light.

  Note that the amount of rotation of the Ye light can be arbitrarily adjusted by adjusting the voltage level applied to the Ye superimposing element 48.

  Here, as the Ye superimposing element 48, for example, a notch filter type element and an edge filter type element can be considered.

  The notch filter type element can adjust only the polarization state of light having a specific wavelength band. For example, a notch filter type element adjusts only the polarization state of light having a longer wavelength band than green, that is, a yellow wavelength band. By using a notch filter type element, unnecessary light (for example, yellow component light) can be reduced.

  An edge filter type element can adjust the polarization state of light having another wavelength band without adjusting the polarization state of light having a specific wavelength band. For example, an edge filter type element adjusts the polarization state of light having a longer wavelength band and a shorter wavelength band than green without adjusting the polarization state of light having a green wavelength band. By using an edge filter type element, the color purity of light having a specific wavelength band (for example, green component light) can be increased.

  In this configuration example, the orientation of the transmission axis of the incident side polarizing plate 49 is adjusted to be parallel to the polarization direction of the G light. Therefore, as shown in FIG. 21A, in a state where no voltage is applied to the Ye superimposing element 48, the polarization direction of Ye light is perpendicular to the azimuth of the transmission axis of the incident-side polarizing plate 49. The light passes through the incident side polarizing plate 49, but the Ye light is blocked by the incident side polarizing plate 49.

  On the other hand, as shown in FIG. 21B, in a state where a predetermined voltage is applied to the Ye superimposing element 48, both the G light and Ye light are polarized in the direction of the transmission axis of the incident side polarizing plate 49. And both pass through the incident side polarizing plate 49.

  Furthermore, if the inclination angle of the polarization direction of the Ye light with respect to the direction of the transmission axis of the incident side polarizing plate 49 is changed by adjusting the voltage applied to the Ye superimposing element 48, the amount of Ye light corresponding to the inclination angle is changed. The light passes through the incident side polarizing plate 49.

  As described above, in this configuration example, by controlling the voltage applied to the Ye superimposing element 49, the amount of Ye light superimposed on the video light can be controlled. Therefore, the luminance and color of the projected image can be adjusted by controlling the voltage applied to the Ye superimposing element 49.

  Here, the control of the applied voltage is desirably adjusted dynamically according to the video signal. For example, the amount of Ye light superimposed on the video light can be dynamically changed according to the brightness of the image represented by the video signal. In addition, it is also possible to dynamically change the amount of Ye light superimposed on video light in consideration of the reproduced color.

  As described above, according to this configuration example, it is possible to increase the brightness of the projected image by superimposing the Ye light on the video light, and at the same time, it is possible to widen the color reproducible range. Further, the visual effect of the projected image can be enhanced by dynamically changing the amount of Ye light superimposed on the video light according to the video light.

<Configuration example 2>
FIG. 22 shows a configuration of a projector according to Configuration Example 2. The illumination device 10 in the present configuration example is the same as the configuration example 1 described above. In this configuration example, the incident-side polarizing plates 17, 23, and 32 and the emission-side polarizing plates 19, 25, and 34 are illustrated as a single configuration. Similarly to 45, 49, and 52 and the output side polarizing plates 47, 51, and 54, a two-sheet configuration can be used as appropriate. Further, in this configuration example, the optical compensators 46, 50, and 53 and the UV cut filter 44 in the configuration example 1 are not shown, but these can be appropriately added to the corresponding optical path.

  In this configuration example, optical elements from the dichroic mirror 65 to the relay lens 74 are arranged as an optical system for modulating Ye light and superimposing it on video light. In the above configuration example 1, the optical system is configured to first separate the R light from the light emitted from the illumination device 10, but in this configuration example, the optical system first separates the B light. Yes.

  Light emitted from the illumination device 10 is incident on the dichroic mirror 61 via the integrator 11, the PBS array 12, and the condenser lens 13. Of this light, B light passes through the dichroic mirror 61, and light other than the B light is reflected by the dichroic mirror 61. The B light transmitted through the dichroic mirror 61 is incident on the dichroic prism 20 via an optical element from the mirror 30 to the exit-side polarizing plate 34.

  Of the light reflected by the dichroic mirror 61, G light is reflected by the dichroic mirror 62, and the other light passes through the dichroic mirror 62. The G light reflected by the dichroic mirror 62 is incident on the dichroic prism 20 through optical elements from the condenser lens 22 to the output side polarizing plate 25.

  The light transmitted through the dichroic mirror 62 enters the dichroic mirror 65 through the condenser lens 63 and the relay lens 64. The dichroic mirror 65 reflects the R light of the incident light and transmits the Ye light. The R light reflected by the dichroic mirror 65 is incident on the dichroic prism 20 via an optical element from the relay lens 66 to the output side polarizing plate 19.

  The Ye light transmitted through the dichroic mirror 65 enters the Ye superimposing element 71 via the mirrors 67 and 69 and the relay lenses 68 and 70. The Ye superimposing element 71 is an element that rotates the polarization direction of Ye light in accordance with the applied voltage, as in the first configuration example. Here, since only the Ye light is incident on the Ye superimposing element 71, a liquid crystal panel can be used as the Ye superimposing element 71.

  The Ye light transmitted through the Ye superimposing element 71 enters the dichroic mirror 62 again through the relay lenses 72 and 74 and the mirror 73, passes through the dichroic mirror 62, and follows the same optical path as the G light.

  The R light, G light, Ye light, and B light incident on the dichroic prism 20 in this way are combined by the dichroic prism 20 to be image light. This image light is projected onto the projection surface (screen surface) via the projection lens 35.

  In this configuration example, the polarization direction of the Ye light is rotated by 90 degrees in a state where no voltage is applied to the Ye superimposing element 71. Therefore, in this case, the polarization direction of Ye light is perpendicular to the polarization direction of G light. Similar to the configuration example 1, the incident-side polarizing plate 23 is adjusted so that the direction of the transmission axis is parallel to the polarization direction of the G light. Therefore, in a state where no voltage is applied to the Ye superimposing element 71, the G light is transmitted through the incident side polarizing plate 23, but the Ye light is blocked by the incident side polarizing plate 23.

  On the other hand, when the voltage applied to the Ye superimposing element 71 is adjusted to change the tilt angle of the polarization direction of the Ye light with respect to the direction of the transmission axis of the incident side polarizing plate 23, the amount of Ye light corresponding to the tilt angle is changed. The light passes through the incident side polarizing plate 23. Therefore, by controlling the voltage applied to the Ye superimposing element 71, the amount of Ye light superimposed on the video light can be controlled, and the brightness and color of the projected image can be adjusted. Here, it is desirable that the control of the applied voltage is dynamically adjusted according to the video signal, as in the first configuration example.

  According to this configuration example, as in the above configuration example 1, it is possible to increase the brightness of the projected image by superimposing the Ye light on the video light, and at the same time, it is possible to widen the color reproducible range. Further, the visual effect of the projected image can be enhanced by dynamically changing the amount of Ye light superimposed on the video light according to the video light.

  The Ye superimposing element 71 may be configured to rotate the polarization direction for each incident region of Ye light. For example, one modulation area on the Ye superimposing element 71 may be associated with a plurality of pixel areas on the liquid crystal panel 24. FIG. 23 is a diagram showing a configuration example (region division example) of the Ye superimposing element 71 when one modulation area on the Ye superimposing element 71 is associated with nine pixel areas on the liquid crystal panel 24. It is. FIG. 4A shows a pixel region on the liquid crystal panel 24, and FIG. 4B shows a modulation region on the Ye superimposing element 71. FIG.

  As described above, if the polarization direction of the Ye light can be rotationally controlled for each modulation area, the amount of Ye light superimposed on the projected image can be appropriately adjusted for each area corresponding to the modulation area. . Therefore, for example, the luminance increment due to the superposition of Ye light can be changed between a bright area and a dark area on the projected image, and the visual effect of the projected image can be further enhanced. In the configuration example 1 as well, if the polarization direction of the Ye light can be rotationally controlled for each modulation region, the visual effect of the projected image can be enhanced.

  In the configuration of FIG. 22, the Ye light is separated by the dichroic mirror 65, modulated, and then fed back to the optical path of the G light. However, the separation and feedback of the Ye light are not limited to this. Other ways can be taken. For example, in the configuration of FIG. 22, the modulated Ye light can be returned to the optical path of the R light. Alternatively, the dichroic mirror 61 separates the B light and the Ye light, and further, the mirror 30 is replaced with a dichroic mirror to separate the Ye light, and the separated Ye light is modulated and then returned to the optical path of the B light. It can also be done.

<Configuration example 3>
FIG. 24 shows a configuration of a projector according to Configuration Example 3. In the first and second configuration examples, the Ye light is modulated and incident on the G light liquid crystal panel 24. However, in the present configuration example, the Ye light is modulated and the G light liquid crystal panel 24 is modulated. The light is incident on the liquid crystal panel 18 for R light.

  In this configuration example, the incident-side polarizing plates 17, 23, and 32 and the emission-side polarizing plates 19, 25, and 34 are illustrated in a single configuration, but these are the incident-side polarizing plates in the configuration example 1 described above. As in the case of 45, 49, 52 and the output side polarizing plates 47, 51, 54, a two-plate structure is appropriately used. Further, in this configuration example, the optical compensators 46, 50, and 53 and the UV cut filter 44 in the configuration example 1 are not illustrated, but these are appropriately added to the corresponding optical path.

  This configuration example is an optical system that first separates the B light as in the configuration example 2 described above. In addition, the same code | symbol is attached | subjected to the same part as the said structural example 2. FIG. The illumination device 10 in the present configuration example is the same as the configuration example 1 described above.

  Light emitted from the illumination device 10 is incident on the dichroic mirror 61 via the integrator 11, the PBS array 12, and the condenser lens 13. Of this light, B light passes through the dichroic mirror 61, and light other than the B light is reflected by the dichroic mirror 61. The B light transmitted through the dichroic mirror 61 is incident on the dichroic prism 20 via an optical element from the mirror 30 to the exit-side polarizing plate 34.

  Of the light reflected by the dichroic mirror 61, the G light enters the polarization-dependent dichroic mirror 82 via the polarization rotation element 81. The polarization rotation element 81 acts only on Ye light, and rotates the polarization direction of the Ye light according to the applied voltage, like the Ye modulation elements in the configuration examples 1 and 2.

  The dichroic mirror 82 has transmittance characteristics as shown in FIG. In the figure, a diagram with Tp added indicates transmittance characteristics when light is incident on the dichroic mirror 82 in a P-polarized state, and a diagram with Ts added indicates S with respect to the dichroic mirror 82. The transmittance characteristics when light enters in the state of polarized light are shown.

  In this configuration example, the G light and the R light are incident on the dichroic mirror 82 in the state of S polarization. Therefore, as can be seen from the characteristic Ts in the figure, the G light is reflected by the dichroic mirror 82 and the R light is transmitted through the dichroic mirror 82.

  Since the polarization direction of the Ye light is rotated by the polarization rotation element 81, the light passes through the dichroic mirror 82 and is reflected by the dichroic mirror 82 at a rate corresponding to the rotation amount.

  That is, when Ye light is incident on the dichroic mirror 82 with the polarization direction being the same as that of the G light and R light, that is, when Ye light is incident on the dichroic mirror 82 as S-polarized light, Most of the Ye light is reflected by the dichroic mirror 82, and then follows the same optical path as the G light.

  On the other hand, when Ye light is incident on the dichroic mirror 82 in a state where the polarization direction is perpendicular to the polarization directions of the G light and R light, that is, when Ye light is incident on the dichroic mirror 82 with P polarization. Most of the light passes through the dichroic mirror 82 and then follows the same optical path as the R light.

  When the polarization direction of Ye light is between P-polarized light and S-polarized light with respect to dichroic mirror 82, Ye light is transmitted through dichroic mirror 82 at a rate corresponding to the inclination angle of the polarization direction with respect to the direction of P-polarized light. Then, it is reflected by the dichroic mirror 82. That is, in this case, the P-polarized component of the Ye light is transmitted through the dichroic mirror 82 and the S-polarized component is reflected by the dichroic mirror 82. In this case, Ye light is distributed at a predetermined ratio between the optical path of G light and the optical path of R light.

  Returning to FIG. 24, the G light reflected by the dichroic mirror 82 is incident on the dichroic prism 20 through the optical elements from the condenser lens 22 to the exit-side polarizing plate 25.

  On the other hand, the R light and Ye light transmitted through the dichroic mirror 82 are incident on a narrow-band phase difference plate (wavelength selective half-wave plate) 83 through a condenser lens 63. As described above, since the P-polarized component of the Ye light passes through the dichroic mirror 82, the polarization direction of the Ye light after passing through the dichroic mirror 82 is a direction orthogonal to the polarization direction of the R light.

  The narrowband phase difference 83 acts only on Ye light and rotates the polarization direction of Ye light by 90 degrees. Thereby, the polarization direction of Ye light is aligned with the polarization direction of R light. Thereafter, the R light and Ye light are incident on the dichroic prism 20 via the optical elements from the relay lens 64 to the emission side polarizing plate 19.

  The R light, G light, Ye light, and B light incident on the dichroic prism 20 in this way are combined by the dichroic prism 20 to be image light. This image light is projected onto the projection surface (screen surface) via the projection lens 35.

  According to this configuration example, the Ye light is superimposed on the image light through the optical path for G light and the optical path for R light, so that the brightness of the projected image can be increased. Further, by controlling the voltage applied to the polarization rotation element 81, the amount of Ye light distributed to the optical path for G light and the optical path for R light can be changed, and the color reproduction range of the projected image can be adjusted. it can.

  FIG. 26A is a diagram schematically illustrating a color reproduction range when Ye light is distributed to an optical path for R light. In this case, the color reproduction range changes from a range surrounded by a solid line to a range surrounded by a broken line. FIG. 26B is a diagram schematically illustrating a color reproduction range when Ye light is distributed to the optical path for G light. In this case, the color reproduction range changes from a range surrounded by a solid line to a range surrounded by a broken line.

  Note that the voltage applied to the polarization rotation element 81 can be dynamically adjusted according to the video signal, in addition to a method of switching the polarization rotating element 81 according to the mode. When the latter method is employed, the color of the projected image can be adjusted according to the state of the video signal at that time, and the visual effect of the projected image can be enhanced.

  However, according to the present configuration example, Ye light is always distributed to either the optical path for G light or the optical path for R light. Therefore, as can be seen with reference to FIG. It becomes impossible to express.

  FIG. 27 is a diagram showing the configuration of an optical system improved to eliminate such inconvenience. Here, a polarization rotation element 85 is further added to the optical path for G light. Similar to the polarization rotation element 81, the polarization rotation element 85 acts only on Ye light and rotates the polarization direction of the Ye light according to the applied voltage.

  According to this configuration example, the polarization rotator 81 is controlled so that the polarization direction of the Ye light with respect to the dichroic mirror 82 becomes S-polarized light, and the polarization of the Ye light with respect to the direction of the transmission axis of the incident-side polarizing plate 23. By controlling the polarization rotation element 85 so that the directions are orthogonal to each other, only the R light can be incident on the R light liquid crystal panel 18 and only the G light can be incident on the G light liquid crystal panel. Therefore, according to this configuration example, red and green with high purity can be reproduced simultaneously on the projected image.

  In the configuration example of FIG. 27, the polarization rotator 85 for blocking Ye light is arranged in the optical path for G light, but this polarization rotator 85 is not for G light but for R light. Even if it is arranged in the direction of the optical path, the same effect is produced.

  Here, the polarization rotation element 85 has been described for blocking Ye light, but in addition, by controlling the voltage applied to the polarization rotation element 85, the G rotation light or the R light can be compared with the configuration example of FIG. It is also possible to control the gradation of the added Ye light more finely.

  In addition, when Ye light is superimposed as in Configuration Examples 1 to 3, it is assumed that the blue color fades on the projected image. In this case, for example, the lamp 105 in FIG. 19 may be replaced with a light source that emits B light to reinforce the amount of B light.

<Configuration example 4>
FIG. 28 shows a configuration of a projector according to Configuration Example 4. In the above configuration examples 1 to 3, the Ye light is modulated so as to be incident on the G light liquid crystal panel 24 or the G light liquid crystal panel 24 and the R light liquid crystal panel 18. On the other hand, in this configuration example, R light, G light, and B light are respectively converted into Rt light, Gt light, and Bt light, which are wavelength component lights with high color purity of red, green, and blue, respectively, R light, Gr light, and Br light, which are low-purity wavelength component lights, are divided into R light, G light, and Br light by controlling the amounts of incident light of the Rr light, Gr light, and Br light on the liquid crystal panels 18, 24, and 33. In addition, the color purity and light amount of the B light can be adjusted as appropriate.

  In this configuration example, the incident-side polarizing plates 17, 23, and 32 and the emission-side polarizing plates 19, 25, and 34 are illustrated in a single configuration, but these are the incident-side polarizing plates in the configuration example 1 described above. As in the case of 45, 49, 52 and the output side polarizing plates 47, 51, 54, a two-plate structure is appropriately used. Further, in this configuration example, the optical compensators 46, 50, and 53, the UV cut filter 44, and the lenses 41 and 42 in the above configuration example 1 are not shown, but these are appropriately added to the corresponding optical path. The

  In this configuration example, as in the configuration example 1 described above, the optical system first separates the R light. In addition, the same code | symbol is attached | subjected to the same part as the said structural example 1. FIG. The illumination device 10 in the present configuration example is the same as the configuration example 1 described above.

  In this configuration example, R light (Rt light and Rr light), G light (Gt light and Gr light), and B light (Bt light and Br light) are separated by dichroic mirrors 91 and 92, respectively. The light enters the rotation element 93, the G polarization rotation element 94, and the B polarization rotation 95. Here, the wavelength band of R light and the wavelength band of G light are continuous with each other, and the wavelength band of G light and the wavelength band of B light are also continuous with each other. Rr light is light in the wavelength band on the yellow side (short wavelength side) than the wavelength band of Rt light, and Br light is light in the wavelength band on the blue-green side (long wavelength side) than the wavelength band of Bt light. It is. The Gr light can include both light in a wavelength band on the yellow side (long wavelength side) and light in a wavelength band on the blue-green side (short wavelength side) with respect to the wavelength band of Gt light. In this configuration example, the Gr light may be either one of these wavelength bands or both.

  The polarization rotating element 93 for R light acts only on Rr light out of Rt light and Rr light, and rotates the polarization direction of the Rr light according to the applied voltage. As a result, the amount of Rr light incident on the liquid crystal panel 18 is adjusted.

  When the applied voltage to the R light polarization rotation element 93 is OFF, only the Rr light out of the Rt and Rr light incident on the R light polarization rotation element 93 is rotated in the polarization direction from the R light polarization rotation element 93. In response, the polarization direction is rotated by 90 degrees. In this case, the polarization direction of the Rr light is a direction orthogonal to the azimuth of the transmission axis of the incident side polarizing plate 17. Therefore, the Rr light is substantially entirely light-cut by the incident side polarizing plate 17, and only the Rt light is incident on the liquid crystal panel 18.

  On the other hand, when a predetermined level of voltage is applied to the R light polarization rotation element 93, the Rr light is not subjected to the rotation action of the polarization direction from the R light polarization rotation element 93, and has the same polarization direction as the Rt light. Is incident on the incident side polarizing plate 17. In this case, the polarization directions of the Rt and Rr lights are both parallel to the direction of the transmission axis of the incident side polarizing plate 17. Accordingly, the Rt light and the Rr light are transmitted through the incident-side polarizing plate 17 and substantially incident on the liquid crystal panel 18.

  As in the case of the R light polarization rotation element 93, when the voltage applied to the G light polarization rotation element 94 is OFF, the Gr light is subjected to a rotation action in the polarization direction from the G light polarization rotation element 94, and is incident side polarized light. The plate 23 cuts substantially the entire amount of light. In addition, when a predetermined level of voltage is applied to the G light polarization rotation element 94, the Gr light is not subjected to a rotation action in the polarization direction from the G light polarization rotation element 94, and both the Gt light and the Gr light are transmitted. The light is transmitted through the incident-side polarizing plate 23 and is incident on the liquid crystal panel 24.

  Further, when the applied voltage to the B light polarization rotation element 95 is OFF, the Br light is subjected to a rotation action in the polarization direction from the B light polarization rotation element 95, and substantially all the light amount is cut by the incident side polarizing plate 32. . In addition, when a predetermined level of voltage is applied to the B light polarization rotation element 95, the Br light is not subjected to the rotating action in the polarization direction from the B light polarization rotation element 95, and both the Bt light and the Br light are transmitted. The light is transmitted through the incident-side polarizing plate 32 and is incident on the liquid crystal panel 33.

  The R light polarization rotation element 93, the G light polarization rotation element 94, and the B light polarization rotation element 95 are either the notch filter type or the edge filter type, similar to the Ye superposition element of the configuration example 1. It can be comprised with the element of. In any type, the R light polarization rotation element 93, the G light polarization rotation element 94, and the B light polarization rotation element 95 are configured to operate only in the wavelength bands of Rr light, Gr light, and Br light, respectively. Is done.

  FIG. 29 is a diagram illustrating an effect in this configuration example. In the figure, the light amount priority mode refers to the polarization directions of Rr light, Gr light, and Br light with respect to all of the R light polarization rotation element 93, the G light polarization rotation element 94, and the B light polarization rotation element 95. The color purity priority mode is a mode in which all applied voltages to the R light polarization rotation element 93, the G light polarization rotation element 94, and the B light polarization rotation element 95 are turned off. This is the mode to use.

  In the light amount priority mode, the Rr light, the Gr light, and the Br light are respectively incident on the liquid crystal panels 18, 24, and 33, so that the total light amount of the projected image increases accordingly. However, when these lights are mixed, the color purity of red, green, and blue is lowered. Therefore, the color reproduction range of the projected image is a range surrounded by a dotted line in FIG.

  In contrast, in the color purity priority mode, Rr light, Gr light, and Br light are not incident on the liquid crystal panels 18, 24, and 33, so that the total light amount of the projected image is lower than that in the light amount priority mode. However, since these lights are not mixed, the color purity of red, green, and blue is improved. For this reason, the color reproduction range of the projected image is extended to the range surrounded by the solid line in FIG.

  As described above, in this configuration example, the R light polarization rotation element 93, the G light polarization rotation element 94, and the B light polarization rotation element 95 are ON / OFF controlled, so that the light amount (luminance) of the projected image is appropriately set. And color reproducibility can be adjusted. Therefore, it is possible to provide a projector that can smoothly meet the needs of high brightness and color reproducibility.

  Also in this configuration example, the polarization of the Rr light, the Gr light, and the Br light is controlled by controlling the applied voltages to the R light polarization rotating element 93, the G light polarization rotating element 94, and the B light polarization rotating element 95. The amount of rotation in the direction can be arbitrarily adjusted, and thus the amount of superimposition of Rr light, Gr light, and Br light on the image light can be adjusted as appropriate. Therefore, for example, if the control circuit is configured to control the applied voltage to the polarization rotating element 93 for the R light, the polarization rotating element 94 for the G light, and the polarization rotating element 95 for the B light according to the video signal, the state of the projected image The amount of Rr light, Gr light, and Br light superimposed on the image light can be adjusted dynamically according to the above, and appropriate luminance and color reproducibility can be realized at any given time.

  As mentioned above, although the Example which concerns on this invention was shown, this invention is not restrict | limited by the said Example, In addition to the above, the Example of this invention can be variously changed.

  The modification examples of the mirror configuration shown in FIGS. 3B to 3C can be appropriately applied to the configuration examples shown in the second and subsequent embodiments, and the configuration examples after the second embodiment are appropriately shown in FIG. It is also possible to change to the hybrid illumination system shown.

  In addition, the embodiment of the present invention can be variously modified as appropriate within the scope of the technical idea shown in the claims.

  The structural examples 1 to 3 of the ninth embodiment correspond to the embodiment of the invention of the ninth aspect, and the fourth structural example corresponds to the embodiment of the invention of the tenth aspect.

1 is a diagram illustrating a configuration of an optical system of a projector according to a first embodiment. The figure which shows the structure of the illuminating device which concerns on Example 1. FIG. The figure which shows the structure of the mirror which concerns on Example 1, and its modification example The figure explaining lighting control of the illuminating device which concerns on Example 1. FIG. The figure which shows the example of a change (hybrid illumination system) of the illuminating device which concerns on Example 1. FIG. The figure which shows the example of a change (change example of a lamp output) of the illuminating device which concerns on Example 1. FIG. The figure which shows the example of a change (change example of a lamp output) of the illuminating device which concerns on Example 1. FIG. The figure which shows the structural example of the illuminating device which concerns on Example 2. FIG. The figure which shows the other structural example of the illuminating device which concerns on Example 2. FIG. The figure which shows the structural example of the illuminating device which concerns on Example 3. FIG. The figure which shows the other structural example of the illuminating device which concerns on Example 3. FIG. The figure which shows the structural example of the illuminating device which concerns on Example 4. FIG. The figure which shows the structural example of the illuminating device which concerns on Example 5. FIG. The figure which shows the structural example of the illuminating device which concerns on Example 6. FIG. The figure which shows the structural example of the illuminating device which concerns on Example 7. FIG. The figure which shows the structural example of the illuminating device which concerns on Example 8. FIG. The figure which shows the other structural example of the illuminating device which concerns on Example 8. FIG. The figure which shows the characteristic of the lamp | ramp which concerns on Example 9. The figure which shows the structure of the projector which concerns on the structural example 1 of Example 9. FIG. The figure explaining the color reproduction range of the projector which concerns on the structural example 1. The figure explaining the effect | action of the Ye modulation element which concerns on the structural example 1. The figure which shows the structure of the projector which concerns on the structural example 2 of Example 9. FIG. The figure which shows the structural example of the modulation area | region of the Ye modulation element which concerns on the structural example 2 of Example 9. FIG. The figure which shows the structure of the projector which concerns on the structural example 3 of Example 9. FIG. The figure which shows the transmittance | permeability characteristic of the dichroic mirror 82 which concerns on the structural example 3. The figure explaining the color reproduction range of the projector which concerns on the structural example 3. The figure which shows the example of a change of the projector which concerns on the example of a structure 3. The figure which shows the structure of the projector which concerns on the structural example 4 of Example 9. FIG. The figure explaining the effect of the projector which concerns on the example of a structure 4. The figure explaining the problem of the prior art The figure explaining the problem of the prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Illuminating device 101-104 ... Lamp (1st light source)
105 ... Lamp (second light source)
111-114 ... Mirror (first reflection unit)
111a-114a ... Light transmission part (transparent part)
115 ... Mirror (second mirror unit)
116 ... Mirror (first mirror unit)
116a: Transparent region (transparent part)
117 ... Mirror (second mirror unit)
118a ... Convex lens (lens element)
118b ... Concave lens (lens element)
121 ... Solid light source (second light source)
131 to 134 Solid light source (first light source)
135 ... Lamp (second light source)
145 ... Lamp (second light source)
155 ... Lamp (second light source)
201-203 ... Lamp (first light source)
204 ... Lamp (second light source)
211 to 213 ... Mirror (first mirror unit)
301 to 306... Lamp (first light source)
307, 308 ... Lamp (second light source)
311 to 316 ... Mirror (first reflection unit)
317, 318 ... Mirror (second reflection unit)
401-404 ... Lamp (first light source)
405, 406 ... Lamp (second light source)
411, 412 ... Prism array (first reflection unit)
433, 434 ... Mirror (second reflection unit)

Claims (10)

A first light source unit composed of a plurality of first light sources;
A first reflection unit that guides each light emitted from the first light source in the same direction;
The second light source has at least one second light source and has a relatively small light amount distribution in a plane perpendicular to the traveling direction of light from the first light source unit after being reflected by the first reflection unit. A second light source unit configured to arrange the optical axis center of the light source;
A lighting device comprising: The lighting device according to claim 1.
The plurality of first light sources are arranged such that their optical axes are parallel to each other.
A lighting device characterized by that. The lighting device according to claim 2,
The second light source is arranged such that its optical axis is parallel to the optical axis of the first light source,
A second reflection unit that guides light from the second light source in the same direction as the light from the first light source unit after being reflected by the reflection unit;
A lighting device characterized by that. In the illuminating device as described in any one of Claim 1 thru | or 3,
The second light source unit is disposed on the back side of the first light source unit with respect to the traveling direction of light from the first light source unit after being reflected by the first reflection unit,
The first reflection unit has a notch or a transparent portion formed at a light passing position from the second light source unit.
A lighting device characterized by that. In the illuminating device as described in any one of Claims 1 thru | or 4,
At least one lens element is disposed on the optical axis of the second light source;
A lighting device characterized by that. A first light source unit composed of four first light sources;
A predetermined rectangular shape is provided in a plane perpendicular to the traveling direction of the light from the first light source unit after being reflected by the mirror surface and having a mirror surface that guides each light emitted from the first light source in the same direction. A first reflection unit arranged so that the optical axis centers of the four light sources are positioned at the apex position of the shape;
A second light source arranged so that the center of the optical axis is located at the center position of the square shape;
A lighting device comprising: The lighting device according to claim 6.
The second light source is disposed behind the first light source unit with respect to the traveling direction of light from the first light source unit after being reflected by the first reflection unit,
The first reflection unit has a notch or a transparent portion formed at a light passing position from the second light source unit.
A lighting device characterized by that.   A projection-type image display device equipped with the illumination device according to any one of claims 1 to 7. The projection display apparatus according to claim 8, wherein
A light modulator for R that modulates light based on a video signal for red;
A G light modulation element that modulates light based on a green video signal;
A light modulation element for B that modulates light based on a blue video signal;
A light guide optical system that guides light in the red wavelength band, green wavelength band, and blue wavelength band of light emitted from the illumination device to the R light modulation element, the G light modulation element, and the B light modulation element, respectively. When,
A light combining element that combines the light of each wavelength band modulated by each light modulation element to generate image light;
Light superimposing means for superimposing light in a fourth wavelength band other than the wavelength bands among the light emitted from the illumination device on the video light;
A fourth light modulation element for modulating the light in the fourth wavelength band;
A projection display apparatus characterized by comprising: The projection display apparatus according to claim 8, wherein
A light guide optical system that separates light emitted from the illumination device into color component light and guides it to a corresponding light modulation element;
The second wavelength with respect to the light modulation element by acting on the light in the second wavelength band other than the first wavelength band, which is arranged in the light guide optical system and has high color purity of a single color among the color component lights A light amount adjusting means for adjusting the incident light amount of the band light;
A projection display apparatus characterized by comprising:

Images