JP2007065104A - Illuminating device and image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize high luminance in an illuminating device by highly efficiently supplying light deflected in specific oscillating direction and light of a specific wavelength region. <P>SOLUTION: In the illuminating device, a λ/4 wavelength plate 106 is disposed between an integrator 105 and a deflection separation element 107. Also, a reflecting part 103 is disposed on the inside of the incident end face of the integrator and a reflecting part 109 is disposed on the emission face side of the deflection separation element for first deflected light separated by the deflection separation element. Further, a color filter 110, through which light rays of the specific wavelength regions are transmitted and light rays of the other wavelength areas are reflected, is disposed on the emission face side of the deflection separation element for second deflected light separated by the deflection separation element. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lighting device and a video display device, and more particularly to a lighting device for a projection video display device.

  Conventionally, as an illumination system apparatus having a circulation process, an illumination apparatus using a reflective polarizing plate is known. An illumination device using a reflective polarizing plate includes a light source that supplies light having different polarization components, a planar mirror positioned behind the light source, a λ / 4 retardation plate positioned in front of the light source, and A reflective polarizing plate is provided that transmits polarized light in a specific vibration direction located in front of the retardation plate and reflects polarized light in a vibration direction different from the specific vibration direction.

  Specifically, in an illumination device using a reflective polarizing plate, the first polarization component emitted from the light source is transmitted through the λ / 4 retardation plate and the reflective polarizing plate. On the other hand, the second polarization component emitted from the light source is transmitted through the λ / 4 retardation plate and reflected by the reflective polarizing plate located in front of the λ / 4 retardation plate, and again the λ / 4 retardation plate. And becomes circularly polarized light. Further, the light is reflected by a mirror located behind the light source, and this reflected light is transmitted again through the λ / 4 phase difference plate. By passing through the λ / 4 retardation plate twice, the polarization direction of the circularly polarized light is changed and transmitted through the reflective polarizing plate. In this way, polarized light in a specific vibration direction can be taken out one after another in the process of light recirculating through the optical path between the mirror located behind the light source and the reflective polarizing plate. As a result, polarized light having a specific vibration direction can be obtained with high utilization efficiency.

  An example of an illumination device using a reflective polarizing plate is disclosed in Japanese Patent Laid-Open No. 10-162619.

Japanese Patent Laid-Open No. 10-162619

However, in the illumination device using the reflective polarizing plate,
(1) Since the reflective polarizing plate is placed immediately after the light source, it is greatly affected by the heat from the light source,
(2) Light with various angular gradients from the light source is incident on the reflective polarizing plate, resulting in poor angular characteristics.
For example, there is a problem that the light use efficiency is poor.

  An object of the present invention is to provide an illuminating device capable of improving light use efficiency and increasing the brightness of an image, and an image display device using the same.

  In the illumination device of the present invention, a λ / 4 wavelength plate is disposed between the integrator and the deflection separation element, and is reflected on the inside of the incident end face of the integrator and on the emission surface side of the first deflected light separated by the deflection separation element. Provide a part. Furthermore, a color filter that transmits light in a specific wavelength region and reflects light in other wavelength regions is provided on the emission surface side of the second deflected light separated by the deflection separation element.

  It is possible to provide a video display device with improved light utilization efficiency and high brightness.

  Hereinafter, the best mode of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a configuration diagram of an illumination device showing a first embodiment according to the present invention. In FIG. 1, reference numeral 100 denotes an arc tube that emits light including different polarization components, and 101 is an elliptical reflector that reflects light from the arc tube 100. The light source 102 is formed by the arc tube 100 and the reflector 101.

  Reference numeral 105 denotes a rod integrator that makes the light amount distribution uniform, and has a prismatic structure composed of an optically transparent member (for example, a glass member) having a substantially square cross section. Further, the rod integrator 105 has an incident end face S1 on the light source 102 side and an exit end face S2 on the opposite side to the incident end face S1. A reflection mirror 103 serving as a reflection portion is formed on a surface (hereinafter referred to as an incident surface) on which light from the light source 102 of the rod integrator 105 is incident. The reflection mirror 103 can be formed by evaporating a metal such as aluminum or silver. Reference numeral 104 denotes an opening for allowing the light from the light source 102 to enter the rod integrator 105.

  Reference numeral 107 denotes a polarization beam splitter, and a λ / 4 phase difference plate 106 for adjusting the polarization direction is formed on the incident end face. The polarization beam splitter 107 includes a polarization separation surface 108 that transmits polarized light in a specific vibration direction (for example, P-polarized light) and reflects polarized light in another vibration direction (for example, S-polarized light) different from the specific vibration direction. Has been. In the following description, it is assumed that the polarization separation surface 108 transmits P-polarized light and reflects S-polarized light. Reference numeral 109 denotes a reflection unit that reflects the S-polarized light reflected from the polarization separation surface 108 to the polarization separation surface 108 again. A color filter 110 spatially separates the light from the polarization beam splitter 107 into R, G, and B light. In this case, the color filter 110 is provided by being bonded to the emission end face of the polarization beam splitter 107.

  In the illumination device 111 configured as described above, white light from the light source 102 obtained by reflecting the light emitted from the arc tube 100 with the reflector 101 travels in the direction of the rod integrator 105. An opening 104 is provided on the incident end face of the rod integrator 105. At this time, the light reflected from the reflector 101 is condensed on the opening 104 of the rod integrator 105, whereby the light supplied from the light source 102 can be used efficiently. Note that the light source 102 is not limited to the configuration including the arc tube 100 and the reflector 101 as long as light can be efficiently supplied to the opening 104.

  Next, the operation of the first embodiment will be described with reference to FIG.

  2A and 2B show the configuration of the rod integrator 105, the polarization beam splitter 107, and the color filter 110. FIG. FIG. 2C shows a configuration in which the rod integrator 105 is viewed from the incident end face side. As shown in FIG. 2C, the incident end face of the rod integrator 105 of the present embodiment has a configuration in which the reflection mirror 103 has a circular opening 104 whose center coincides with the center of the optical axis of the illumination optical system. .

  A configuration of a recirculation process for supplying polarized light having a specific vibration direction will be described with reference to FIG.

Light supplied from a light source (not shown) and incident into the rod integrator 105 from the opening 104 travels in the direction of the emission end face while repeating reflection in the rod integrator 105, and passes through the λ / 4 phase difference plate 106. The light enters the polarization beam splitter 107 (light L1). The light that has entered the polarization beam splitter 107 is transmitted through the polarization splitting surface 108 as P-polarized light and reflected as S-polarized light. The S-polarized light (light L <b> 2) reflected by the polarization separation surface 108 is reflected by the reflection unit 109, passes through the λ / 4 retardation plate 106 again, and enters the rod integrator 105. Here, the light L2 that is S-polarized light is converted into circularly-polarized light.
The light re-entering the rod integrator 105 travels in the direction of the incident surface while being repeatedly reflected in the rod integrator 105, is reflected by the reflecting portion 103, and travels in the direction of the emission end surface while being repeatedly reflected in the rod integrator 105. By passing through the λ / 4 retardation plate 106 again, it is converted from circularly polarized light to P-polarized light that is linearly polarized light, passes through the polarization separation surface 108, and enters the color filter 110 (light L3).

  In this way, in the process of light recycling through the optical path between the reflection unit 103 and the reflection unit 109, the polarization direction is changed, and the polarization separation surface 108 is transmitted, and P-polarized light having a specific vibration direction can be extracted one after another. it can. As a result, it is possible to obtain P-polarized light having a specific vibration direction with high utilization efficiency.

  Next, a recirculation process configuration for efficiently supplying light in a specific wavelength region will be described with reference to FIG. The light that has entered the rod integrator 105 from the opening 104 travels in the direction of the emission end face while being repeatedly reflected in the rod integrator 105, passes through the λ / 4 phase difference plate 106, and enters the polarization beam splitter 107. . The light incident on the polarization beam splitter 107 is transmitted only by the P-polarized light through the polarization separation surface 108 and enters the color filter 110 (light M1). The color filter 110 further transmits light in a specific wavelength region of the P-polarized light, and reflects light in a wavelength region other than the specific wavelength region. For example, as shown in FIG. 2B, the light M1 is incident on a region R110R on the color filter 110. The region R110R on the color filter 110 transmits R light that is light in a specific wavelength region, and reflects G light and B light that are light in a wavelength region other than the specific wavelength region.

The G light and B light (light M2) reflected by the color filter 110 travel in the opposite directions to the direction of incidence on the color filter 110, pass through the polarization beam splitter 107 and the λ / 4 phase difference plate 106, and are rods. The light enters the integrator 105. Here, the light that is P-polarized light is changed to circularly-polarized light (light M3). The light converted into the circularly polarized light travels in the direction of the incident end face of the rod integrator 105, is reflected by the reflecting portion 103, travels again in the direction of the exit end face of the rod integrator 105 (light M4), and again becomes a λ / 4 retardation plate. By passing through 106, circularly polarized light is converted to S-polarized light.
The light converted into the S-polarized light is reflected by the polarization separation surface 108 to the reflecting portion 109 (light M5), and the light reflected from the reflecting portion 109 is transmitted again through the λ / 4 phase difference plate 106, and the rod integrator. 105 is incident. The light incident on the rod integrator 105 travels toward the incident end face of the rod integrator 105 while repeating reflection (light M6). Here, the light M5 which is S-polarized light is converted into circularly-polarized light. The light M6 converted into the circularly polarized light is reflected by the reflecting portion 103 and travels in the direction of the exit end face of the rod integrator 105 while repeating reflection again in the rod integrator 105 (light M7), and again the λ / 4 phase difference plate. By passing through 106, circularly polarized light is converted to linearly polarized P-polarized light (light M8). The light converted into the P-polarized light by the λ / 4 phase difference plate 106 is reflected by the reflecting portion 109 ′, passes through the polarizing beam splitter 107, and enters the color filter 110 again (light M8).

  For this reason, the light M8 has a high probability of being incident on the color filter 110 at a position different from the position where the light M1 is incident. For example, as shown in FIG. 2B, the light M8 is incident on a region G110G on the color filter 110. Since the light M8 is G light and B light, G light that is light in a specific wavelength region passes through the color filter 110. Further, the B light, which is light in a wavelength region other than the specific wavelength region, is reflected by the color filter 110, travels in the direction opposite to that before entering the color filter 110 again, and passes through the polarization beam splitter 107. In this way, the light that is first incident on the color filter 110 and reflected is incident on a position different from the position where the light originally entered when the light is incident on the color filter 110 again. For this reason, there is a high possibility that light incident on the color filter 110 again can pass through the color filter 110. Further, the light incident on the color filter 110 again and further reflected passes through the polarization beam splitter 107 and the rod integrator 105 and travels on the optical path described above.

  As a result, in the process of recirculating light through the optical path between the reflecting portion 103 on the incident end face of the rod integrator 105 and the color filter 110, the color filter 110 can sequentially extract light in a specific wavelength region. As a result, light in a specific wavelength region can be obtained with high utilization efficiency.

  In the example of FIG. 2B, the reflective portion 109 ′ is further provided on the opposing surface of the reflective portion 109. In the case of this configuration, in the example of FIG. 2B, the reflection unit 109 ′ is further provided on the surface facing the reflection unit 109. In the case of this configuration, part of the P wave that has passed through the deflection separation surface and the light reflected by the color filter 110 are prevented from leaking from the surface opposite to the surface on which the reflection unit 109 is disposed, thereby reducing the light use efficiency. It becomes possible to improve.

  FIG. 3 shows a configuration example of the color filter 110. In FIG. 3, a region R110R, a region G110G, and a region B110B of the color filter 110 are regions through which R light, G light, and B light, which are light in specific wavelength regions, are transmitted. For example, an R light transmitting dichroic film, a G light transmitting dichroic film, and a B light transmitting dichroic film can be used in each region of the color filter 110. The region R110R transmits only R light, which is light in a specific wavelength region, and reflects G light and B light, which are light in other wavelength regions. The region G110G transmits G light and reflects R light and B light. The region B110B transmits the B light and reflects the R light and the G light. In this way, the color filter 110 transmits light in a specific wavelength region and reflects light in another wavelength region different from the light in the specific wavelength region. As a result, the color filter 110 color-separates the light from the light source 102. Moreover, it is good also as a structure which differs in the area of at least 1 permeation | transmission area | region among area | region R110R which comprises the color filter 110, area | region G110G, and area | region B110B.

  FIG. 4 shows a configuration example of the color filter 120 in which the areas of the transmission regions are different. In FIG. 4, a region R120R, a region G120G, and a region B120B of the color filter 120 are regions that transmit R light, G light, and B light, which are light in specific wavelength regions, respectively. As shown in FIG. 4, the brightness and the color can be adjusted by adjusting the area of at least one transmission region among the region R120R, the region G120G, and the region B120B.

  FIG. 5 shows a configuration example of the color filter 121 provided with the region W. In FIG. 5, a region R121R, a region G121G, a region B121B, and a region W121W of the color filter 121 are regions that transmit R light, G light, B light, and W light, which are light in specific wavelength regions, respectively. By providing the region W121W as described above, a bright projection image can be obtained by the light transmitted through the region W121W. Further, the arrangement of the areas of the color filter is not limited to that shown in the figure.

The rod integrator 105 is not a rod lens filled with a glass member as shown in FIG. 1, but can be realized by a light pipe having a hollow structure and a reflecting mirror formed on the inner surface. It is.

  FIG. 6 shows a diagram in which the rod integrator is realized by a mirror (light pipe). A reflection mirror 132 is disposed on the inner surface of the rod integrator 131, and the light incident on the rod integrator 131 travels through the rod integrator 131 while repeating total reflection by the reflection mirror 132, and makes the light quantity distribution uniform. I do. Needless to say, the other operations are the same as those in FIG.

  FIG. 7 is a configuration diagram of the rod integrator 133, the polarization beam splitter 107, and the color filter 110 showing the second embodiment according to the present invention. The same parts as those of the embodiment of the younger brother 1 are denoted by the same reference numerals, and redundant description is omitted.

  This embodiment is characterized by the rod integrator 133. The rod integrator 133 has a prismatic shape in which the area of the incident end face S1 is smaller than the area of the outgoing end face S2. Similar to the first embodiment, the light transmitted through the rod integrator 133, the λ / 4 phase difference plate 106, and the polarization beam splitter 107 is incident on the color filter 110. The light outside the specific wavelength region reflected by the color filter 110 passes through the polarization beam splitter 107 and the λ / 4 phase difference plate 106 again and enters the rod integrator 133. Light incident from the emission end face S2 is repeatedly reflected in the rod integrator 133.

  Since the rod integrator 133 has a prismatic shape having an area of the incident end face S1 smaller than that of the outgoing end face S2, the light incident from the incident end face S1 is repeatedly reflected to reduce the angle and emerge from the outgoing end face S2. The emitted light is emitted in a direction where the angle formed with the central axis of the rod integrator 133 is small.

  With such a configuration, the angle characteristics of the polarization beam splitter 107 and the color filter 110 are improved, and an improvement in efficiency and color purity can be expected, and a polarization conversion characteristic in an image display element such as a liquid crystal panel disposed in the subsequent stage can be expected. It can improve and achieve high contrast.

  FIG. 8 is a configuration diagram of an illumination apparatus showing a third embodiment according to the present invention.

  In the above-described first and second embodiments, the polarizing beam splitter 107 and the color filter 110 are bonded and fixedly arranged. However, the present invention is not limited to this, and can be applied to the case where the color filter 110 is configured to be detachable. Furthermore, the present invention can also be applied when an air layer 140 is provided between the polarizing beam splitter 107 and the color filter 110 as shown in FIG. For example, when importance is attached to brightness, a color filter 121 provided with a region W121W is attached as shown in FIG. In addition, when light in a specific wavelength region is efficiently used and importance is attached to color reproducibility, a color filter 120 capable of adjusting the area of at least one transmission region is mounted as shown in FIG. .

By providing the air layer 140 at the interface between the polarization beam splitter 107 and the color filter 109 and making the color filter 109 detachable, changes according to the purpose of use can be made. If the air layer is thick, light that cannot be captured by the color filter 120 is generated. Therefore, it is preferable that the air layer is thin.
FIG. 9 is a configuration diagram of an optical unit showing a fourth embodiment according to the present invention.

  In FIG. 9, illumination device 111, total reflection mirrors 204 and 205 for bending outgoing light from illumination device 111 are flat-type polarization beam splitters, and 213 is a reflection type liquid crystal panel which is an image display element. 207 irradiates the strip-shaped (strip-shaped) emission shapes of the respective color lights spatially separated into a plurality of colors by the color filter 110 at different locations on the image display element 213 at the same time. Is a reflection-type rotating polyhedron as an integrator optical element that moves (scrolls) the irradiation position in a predetermined direction on the image display element 213. 208, 209, and 210 are imaging lens groups that form an image of the exit surface of the color filter 110 on the reflective liquid crystal panel 213, and 212 is incident side polarized light that transmits polarized light having a predetermined polarization direction (here, S-polarized light). Reference numeral 216 denotes an output-side polarizing plate that transmits polarized light having a polarization direction different from that of the incident-side polarizing plate 212 (here, P-polarized light), 215 denotes a polarizing beam splitter prism, 211 denotes a total reflection mirror 204 and a flat polarizing beam splitter. Reference numeral 205 denotes a λ / 2 wavelength plate that changes the polarization direction. Reference numeral 218 denotes a λ / 2 wavelength plate for converting the polarization direction arranged in front of the polarizing plate 212 on the incident side, 206 denotes a λ / 4 wavelength plate for adjusting the polarization direction, and 214 denotes the polarization beam splitter prism 215 and the reflective liquid crystal. A λ / 4 wave plate 217 for compensating for polarization disposed between the panel 213 and a projection lens 217.

  Here, for ease of explanation, an orthogonal coordinate system as shown in FIG. 9 is introduced for convenience. That is, the optical axis direction of the illumination device 111 is the X axis, the rotational axis direction of the reflective rotary polyhedron 207 is the Z axis, and the X axis and the axis orthogonal to the Z axis are the Y axis. Therefore, the display surface of the reflective liquid crystal panel 213 is parallel to the XZ plane, as is apparent from FIG.

  In the optical unit configured as described above, white light from the light source 102 obtained by reflecting the light emitted from the arc tube 100 with the reflector 101 passes through the opening 104 and enters the rod integrator 105. . The light made uniform by the rod integrator 105 passes through the λ / 4 retardation plate 106 and enters the polarization beam splitter 107. The polarization beam splitter 107 transmits P-polarized light and reflects S-polarized light. The P-polarized light that has passed through the polarization beam splitter 107 enters the color filter 110.

  Here, the S-polarized light reflected by the polarization beam splitter 107 enters the color filter 110 through a recirculation process for supplying polarized light having a specific vibration direction. On the other hand, the P-polarized light transmitted through the polarization beam splitter 107 enters the color filter 110. Note that light in a wavelength region other than the specific wavelength region reflected by the color filter 110 enters the color filter 110 again through a recirculation process for efficiently supplying light in the specific wavelength region.

  The light applied to the color filter 110 is spatially separated in the Y-axis direction into three color lights of R, G, and B light. Therefore, three scroll bands are irradiated on the reflective liquid crystal panel 213. The light beams of the separated color lights are bent by the total reflection mirror 204 and transmitted through the λ / 2 wavelength plate 211, so that the polarization direction is converted from P-polarized light to S-polarized light, and enters the flat polarizing beam splitter 205. To do. Since the incident light is S-polarized light, it is reflected, travels toward the reflective rotary polyhedron 207, is reflected by the reflective rotary polyhedron 207, and enters the flat polarizing beam splitter 205 again. Since a λ / 4 wavelength plate 206 is inserted between the flat polarizing beam splitter 205 and the reflective rotary polyhedron 207, the polarization direction is converted from S-polarized light to P-polarized light while reciprocating between them, so that the flat plate It enters the polarization beam splitter 205 as P-polarized light. This time, each color light is transmitted through the plate-type polarizing beam splitter 205, but after being converted to S-polarized light by the λ / 2 wavelength plate 218, it is transmitted through the incident-side polarizing plate 212 and reflected by the polarizing beam splitter prism 215. The reflective liquid crystal panel 213 is irradiated. At this time, as shown in FIG. 10, the scroll bands 12R, 12G, and 12B of the respective color lights are irradiated to different places on the reflective liquid crystal panel 213, respectively. Each scroll band is scrolled in parallel with the short side direction (X-axis direction) of the reflective liquid crystal panel 213.

  The light of the optical image (image) converted from S-polarized light to P-polarized light emitted from the reflective liquid crystal panel 213 passes through the polarizing beam splitter prism 215 and then passes through the output-side polarizing plate 216 before being projected. The image is enlarged and projected through a lens 217 onto a screen (not shown). As the video display element, a reflective liquid crystal panel is used in the present embodiment, but the present invention is not limited to this, and a transmissive liquid crystal panel, a ferroelectric liquid crystal panel, a micromirror array panel, etc. Either can be used as appropriate. Of course, it goes without saying that an optimal optical system is selected in accordance with the light valve to be used.

  As described above, the illumination device 111 in the optical unit of the present invention can supply polarized light in a specific vibration direction and light in a specific wavelength region with high efficiency.

It is a block diagram of the illuminating device which shows 1st Embodiment by this invention. It is operation | movement explanatory drawing of a rod integrator, a polarizing beam splitter, and a color filter. It is a block diagram of a color filter. It is a block diagram of a color filter when the areas of one transmission region according to the present invention are different. It is a block diagram of the color filter comprised from four area | regions by this invention. It is a block diagram of the illuminating device which shows a hollow rod integrator. It is a block diagram of the illuminating device which shows 2nd Embodiment by this invention. It is a block diagram of the illuminating device which shows 3rd Embodiment by this invention. It is a block diagram of the illuminating device which shows 4th Embodiment by this invention. It is a figure explaining the operation | movement of the color light on a reflection type liquid crystal panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Light-emitting tube, 101 ... Reflector, 102 ... Light source, 103 ... Reflection part, 104 ... Opening part, 105 ... Rod integrator, 106 ... (lambda) / 4 phase difference plate, 107 ... Polarization beam splitter, 108 ... Polarization separation surface, 109 ... reflecting part, 110 ... color filter, 111 ... illuminating device, L1, L2, L3, L4, L5, L6, M1, M2, M3, M4, M5, M6, M7, M8 ... light, S1 ... incident end face, S2 ... Exit end face, 131 ... Rod integrator, 132 ... Reflective mirror, 110R ... Region R, 110G ... Region G, 110B ... Region B, 120 ... Color filter, 120R ... Region R, 120G ... Region G, 120B ... Region B, 121 ... color filter, 121R ... region R, 121G ... region G, 121B ... region B, 121W ... region W, 140 ... air layer, 204 ... Reflection mirror, 205: flat-type polarization beam splitter, 206: λ / 4 wavelength plate, 207: reflection rotating polyhedron, 208, 209, 210: imaging lens group, 211: λ / 2 wavelength plate, 212: incident side polarizing plate 213 ... Reflective liquid crystal panel, 214 ... λ / 4 wavelength plate, 215 ... Polarizing beam splitter prism, 216 ... Exit-side polarizing plate, 217 ... Projection lens, 12R ... Scroll band R, 12G ... Scroll band G, 12B ... Scroll Belt B

Claims (9)

A light source;
A rod having an incident end surface having an opening for receiving light emitted from the light source, a reflection surface of the younger brother 1 formed on the back surface of the incident end surface, and an output end surface for emitting light having a substantially uniform intensity distribution An integrator,
A λ / 4 retardation plate arranged on the exit end face side of the rod integrator;
Of the light that has passed through the λ / 4 retardation plate, the first polarized light is emitted from the surface of the younger brother 1, and the second polarized light that is orthogonal to the first polarized light is emitted from the second side surface. A polarizing beam splitter;
A color filter that is disposed on the first surface and transmits light of a specific wavelength component of the first polarized light and reflects light of a different wavelength component different from the specific wavelength component;
An illuminating device, comprising: a second reflecting portion that is disposed on the second surface and reflects the second polarized light and the light having the other wavelength component. The illuminating device according to claim 1, further comprising a third reflecting portion that reflects the light of the other wavelength component on a surface opposed to the second surface. The lighting device according to claim 1 or 2,
An illumination device, wherein an area of the incident end face is smaller than an area of the exit end face. The proving apparatus according to any one of claims 1 to 3,
The rod integrator has a hollow structure in which a reflection mirror is provided on an inner peripheral surface. 5. The color filter according to claim 1, wherein the color filter includes a plurality of different regions that transmit at least red light, green light, and blue light as specific wavelength components. The lighting device according to item. In the illuminating device of any one of Claim 1 thru | or 5,
An illuminating device, wherein an area of at least one of the plurality of different regions is different from an area of another region. The lighting device according to any one of claims 1 to 6,
The lighting device, wherein the color filter is detachable. The lighting device according to any one of claims 1 to 7,
An illumination device, wherein the polarization beam splitter and the color filter are spaced apart and an air layer is provided. The lighting device according to any one of claims 1 to 8,
An image display element for forming an optical image corresponding to the image signal;
Each color of light emitted from the illumination device is incident,
Change the direction of each optical axis and emit
A scroll optical element that irradiates different areas of the video display element with each of the light of the plurality of colors and moves a region irradiated with each of the lights of the plurality of colors in a predetermined direction;
An image display apparatus comprising: a projection lens that projects light emitted from the image display element as a color image.

Images