JP2000147696A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a bright video by providing a display element modulating and emitting radiated light according to a video and a means to move a separating means, so that plural luminous fluxes are successively irradiated to each area. SOLUTION: A first luminous flux 17 reflected partially by a rotary color separating disk 3 is reflected by a mirror 6, and is irradiated to the upper part of the display element 11 by a irradiating optical system 7, constituted of a lens or the like. Then, a third luminous flux 19 transmitted through a rotating color separating disk 4 is irradiated to the lower part of the display element 11 by the irradiating optical system constituted of the lens or the like. Light irradiated by the display element 11 is modulated by the video of a display surface and is emitted by the display element 11. Emitted light is enlarged and projected on a screen 13 by a projection lens 12 or the like, so that a color video is provided to a viewer. With this constitution, the light emitted from a lamp light source 1 is color-separated temporally in parallel, so that utilization efficiency of the light is improved and a bright video is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention separates light from a lamp into a light beam having a predetermined wavelength range, irradiates the separated light beam to a display element, and modulates and modulates the light corresponding to an image by the display element. The present invention relates to a projector that magnifies and projects light on a screen to obtain an image.

[0002]

2. Description of the Related Art FIGS.
1 will be described. FIG. 9 is a schematic diagram showing a configuration diagram of a main part of a conventional projector, and FIG. 10 is a top view of a conventional rotating color separation disk. In the projector of FIG. 9, irradiation light emitted from a light source 1 of a lamp using a metal halide lamp or the like is reflected by a light-collecting reflecting mirror 2 formed by forming a reflective film on a heat-resistant material such as glass. The light advances forward and is incident on the rotating color separation disk 29 as irradiation light 28. The rotating color separation disk 29 separates the irradiation light 28 into a light beam having a predetermined wavelength range in order to color-separate the irradiation light 28. As shown in FIG. 10, the rotating color separation disk 29 includes a red transmission region 29R, a green transmission region 29G, and a blue transmission region 2 divided into three for each predetermined wavelength range.
9B, each of which is composed of a filter made of a multilayer dielectric thin film or the like. The rotating color separation disk 29 is rotated by a motor 30 around a center O as a rotation axis. When the rotating color separation disk 29 rotates, the incident irradiation light 28 passes through a color corresponding to the wavelength range of the incident position of the rotation color separation disk 29 and irradiates the display element 11. The display element 11 causes the display element driving circuit 31 to display an image corresponding to the color of the emitted light beam on the display surface. Display element 11
Is modulated by an image on the display surface, exits from the display element 11, and is enlarged and projected by the projection lens 12 and the like. When the rotating color separation disk 29 makes one rotation, three colors of red, green, and blue are sequentially displayed, and one field of an image is formed in one cycle, thereby providing a color image to a viewer.

[0003]

FIG. 11 shows the state of an image on the display element 11 of the projector configured as described above.
This will be described with reference to FIGS. FIG. 11 (a)
11C are schematic diagrams showing images on the display device that have passed through the red, green, and blue transmission regions of the rotating color separation disk during one field, respectively.
(D) is a schematic diagram showing an image on the display element when these screens are combined. In this projector, when the rotating color separation disk makes one rotation, FIGS.
As shown in (c), red (R) image 32, green (G)
3 and a blue (B) image 34 are sequentially displayed. A video 35 of one field is formed by a round of the video of these colors. Therefore, for example, when a red color image is displayed, the rotating color separation disk 29 transmits only red and absorbs or reflects other colors, so that it is not effectively used as an image. Therefore, about 2/3 of the irradiation light 28 from the light source 1 such as a lamp is wasted, and the brightness of the image is dark.

[0004] It is an object of the present invention to mitigate such problems.
An object of the present invention is to provide a projector capable of obtaining a bright image. It is another object of the present invention to provide a projector that can effectively use light from a light source.

[0005]

In order to achieve the object of the present invention, a projector according to the present invention comprises a light source, means for separating light from the light source into a plurality of light beams having different wavelength ranges, A plurality of regions to which each of the light beams is irradiated, a display element that modulates and emits the irradiated light according to an image, and the plurality of light beams are sequentially irradiated to each region. Means for moving the separating means.

[0006] The means for separating the light beam comprises a group of disks provided with a plurality of disks having a plurality of filters capable of obtaining a plurality of light beams in different wavelength ranges. The moving means is means for simultaneously rotating the disk group. The means for separating the light beam is provided with a plurality of filters arranged at intervals and reflecting light in different wavelength ranges. Further, the moving means is means for moving each of the filters so as to change an emission angle of a light beam reflected from the plurality of filters. In this projector, the display element is a transmissive display element. Alternatively, the display element is a reflective display element.

Further, the display element has a display surface having an n-divided area, and the separating means separates n (positive integers) disks reflecting n light beams in different wavelength ranges at intervals. Comprising a group of disks superimposed on each other, configured to emit light beams of different wavelength ranges reflected from each disk to the display surface, and to change the wavelength range of the light beams obtained from each disk, Means for rotating the disk group.

Further, the display element has a display surface having an area divided into n, and the separating means has an interval of (n-1) disks reflecting n (positive integer) light beams in different wavelength ranges. And a light flux reflected from the (n-1) discs and a light flux transmitted through a disc through which light passes last among the disc groups in each area of the display surface. The moving means configured to irradiate and change the wavelength range of the light flux obtained from each disk is means for rotating the group of disks. The period during which each of the plurality of light beams is irradiated to each of the regions is an integral multiple of one field.

In order to achieve the object of the present invention, a projector according to the present invention separates a light source of a lamp into light beams having a plurality of different wavelength ranges sequentially, and separates the separated light beams from almost the entire light irradiation surface of a display element. In a projector that sequentially irradiates light and modulates light in accordance with an image by a display element and enlarges and projects the modulated light on a screen to obtain an image, a plurality of light beams having different wavelength ranges are separated from the light source almost simultaneously. Irradiating the separated light beam to each of the light-irradiated surfaces of the display element divided into the same number of regions as the number of the plurality of light beams, and sequentially irradiating the plurality of light beams to each of the regions; Modulates the light in the wavelength range corresponding to an image during the period in which the light in the wavelength range is irradiated, for each of the areas to be irradiated with the plurality of light fluxes.

Further, the means for substantially simultaneously separating a plurality of light beams having different wavelength ranges is such that, where n is the number of light beams in the wavelength range to be separated, the circumference of n substantially circular disks is divided into n portions. A portion is provided with a color separation function of reflecting light in a predetermined wavelength range, and the n substantially circular disks are stacked at regular intervals to form a disk group, and the nth disk from the first disk of the disk group is formed. The circumferential position of each disk is adjusted so that the light is sequentially reflected and reflected in a predetermined wavelength range over the disks, and the light of the lamp is irradiated onto the first disk of the disk group at an incident angle of about 45 degrees. Irradiating each of the regions of the display element with light having a predetermined wavelength range of 1 to n obtained from each of the disks, and rotating the group of disks to form a disk in each of the regions of the display element. They were arranged so as to emit light in different wavelength ranges in the order of the divided wavelength ranges.

The means for substantially simultaneously separating a plurality of light beams having different wavelength ranges may be such that, where n is the number of lights in the wavelength range to be separated, the circumference of (n-1) substantially disks is divided into n, Each divided part is provided with a color separation function of reflecting light in a predetermined wavelength range, and the n-1 substantially disks are stacked at regular intervals to form a disk group, and the first disk of the disk group is formed. A plurality of luminous fluxes obtained by sequentially selectively reflecting luminous fluxes in different wavelength ranges on the (n-1) th disk, and luminous fluxes in a wavelength range different from the luminous fluxes passing through the (n-1) th disk are obtained. The circumferential position of each disk is adjusted so that the first disk of the disk group is irradiated with the light of the lamp at an incident angle of about 45 degrees, and a predetermined number of 1 to n obtained from the disk group is obtained. Irradiating each region of the display element with light having a wavelength range of The light applied to the region is arranged to illuminate in the order of the light beam in a wavelength region obtained by dividing a disk of. In these projectors, the period in which the plurality of light beams are irradiated on the respective regions of the display element and all the plurality of light beams are irradiated on the respective regions is a positive integer multiple of one field for obtaining an image. desirable.

Further, the means for substantially simultaneously separating a plurality of light beams having different wavelength ranges comprises a color separation device for reflecting n light beams of a predetermined wavelength range, where n is the number of lights in the wavelength range to be separated. Filters are stacked at predetermined intervals, a plurality of light fluxes in the different wavelength ranges are obtained by the n filters, and the obtained light fluxes are arranged so as to be reflected toward the display element. The arrangement angle of each of the filters is changed at regular time intervals so that the light having the above-mentioned luminous flux is applied to each of the regions of the display element. The period during which each of the regions is irradiated with all of the plurality of light beams is a positive integer multiple of one field for obtaining an image. In these projectors, the plurality of different wavelength ranges are three wavelength ranges of red light, blue light, and green light, and one side of the region for irradiating the light flux of the display element has one side of the display element. The long side of the display surface is divided into approximately three equal parts, and the other side is the short side of the display surface of the display element.

In the projector according to the present invention, the use of light emitted from the lamp is not time-serial color separation in the prior art, but is time-parallel color separation. Is improved compared to the conventional art, and a bright image can be obtained.

[0014]

Embodiments of the present invention will be described below with reference to the drawings using some examples.
FIG. 1 is a schematic diagram showing a configuration of a main part of a first embodiment of a projector according to the present invention. In FIG. 1, reference numeral 1 denotes a light source of a lamp, 2 denotes a light-collecting reflecting mirror having a reflective film formed on a heat-resistant material such as glass, and 3 and 4 denote rotations for separating irradiation light 15 from the light source 1 into a predetermined wavelength range. A color separation disk, 5 is a driving motor for rotating the center of the rotating color separation disks 3, 4 as an axis, 6, 8 are reflection mirrors, 7, 9, 10 converge irradiation light 15 on a display element by a lens or the like. Reference numeral 11 denotes a display element, 12 denotes a projection lens, 13 denotes a screen, and 14 denotes a display element drive circuit that drives the display element.

In the projector shown in the figure, irradiation light 15 emitted from a light source 1 of a lamp using a metal halide lamp or the like is reflected by a condensing reflecting mirror 2 and is irradiated with the irradiation light 15.
As forward. The irradiation light 15 is used for color separation.
The light is incident on the rotating color separation disk 3, where it is separated into light beams having a predetermined wavelength range. That is, the first light flux 17 partially reflected by the rotating color separation disk 3 is reflected by the mirror 6 and is irradiated with the display element 11 by the irradiation optical system 7 composed of a lens or the like.
Irradiates the upper area of The light beam transmitted through the rotating color separation disk 3 is incident on another rotating color separation disk 4, and the second light beam 18 partially reflected by the rotating color separation disk 4 is reflected by the mirror 8, and is constituted by a lens and the like. The irradiation optical system 9 irradiates the central area of the display element 11. Further, the third light flux 19 transmitted through the rotating color separation disk 4 is irradiated to a lower region of the display element 11 by the irradiation optical system 10 including a lens or the like. The light applied to the display element 11 is modulated by the image on the display surface and emitted from the display element 11. The emitted light is enlarged and projected on the screen 13 by the projection lens 12 and the like, and provides a color image to the viewer.

Next, the function of the rotating color separation disks 3 and 4 and the principle of displaying an image will be described with reference to FIGS. FIG. 2 is a schematic view for explaining the principle of separating the irradiation light into a predetermined wavelength range in the projector according to the present invention, and FIG. 3 is a top view showing one embodiment of the rotating color separating disk of the projector according to the present invention. It is. FIGS. 4A to 4D are schematic diagrams showing images on the display element for one field, and FIG. 4D is a schematic diagram showing an image on the display element when these screens are combined. FIG. FIG. 5 is a characteristic diagram showing the transition of the light irradiated on the display element over time, in which the horizontal axis indicates time t and the vertical axis indicates the incident position P of the display element.

In FIGS. 2 and 3, the rotating color separation disks 3 and 4 change the wavelength range to be reflected depending on the rotation position of the disks. The rotating color separating disk 3 is divided into about 1/3, and selectively reflects a wavelength range corresponding to red, and is configured to transmit light in other wavelength ranges. 3R, a blue reflection region 3B configured to selectively reflect a wavelength region corresponding to blue and transmit light substantially in other wavelength regions, and selectively reflect a wavelength region corresponding to green. And a green reflection region 3G configured to transmit light in other wavelength ranges. Further, the rotating color separation disk 4 is divided into about 1/3, and selectively reflects a wavelength range corresponding to green, and is configured to transmit the remaining light roughly.
G and a red reflection region 4 configured to selectively reflect a wavelength range corresponding to red and transmit substantially the remaining light.
R and a blue reflection region 4 configured to selectively reflect a wavelength range corresponding to blue and transmit the remaining light substantially.
B.

Therefore, when the rotating color separation disks 3 and 4 are rotated by the motor 5 in the direction of the arrow in FIG. 2, the irradiation light 15 is incident on the rotation color separation disk 3. The first light flux 17 reflected by the red reflection area 3R is reflected by the mirror 6, and irradiates the upper region 20 of the display element 11 with red by the irradiation optical system 7. Light flux 16 transmitted through rotating color separation disk 3
Is incident on the rotating color separation disk 4. The second light flux 18 reflected by the green reflection area 4G is reflected by the mirror 8, and irradiates the central area 21 of the display element 11 with green by the irradiation optical system 9. Further, the third light flux 19 transmitted through the green reflection area 4 </ b> G of the rotating color separation disk 4 irradiates the lower region 22 of the display element 11 with blue by the irradiation optical system 10. Accordingly, the upper region 20, the central region 21, and the lower region 22 of the display element 11 are irradiated with red, green, and blue light, respectively. Therefore, as shown in FIG. 4A, the image of the display element 11 is such that a red image 20R is displayed in the upper region 20, a green image 21G is displayed in the central region 21, and a blue image 21G is displayed in the lower region 22. The image 22B is controlled to be displayed. Therefore, the display device controlled in this way is irradiated with red, green, and blue light in order from the above, and the light is modulated by the image of the display device 11 and enlarged and projected on the screen 13. The screen 13 displays red, green, and blue images sequentially from the top.

Next, when the rotating color separation disks 3 and 4 are further rotated in the direction of the arrow in FIG. 2 by the motor 5, the irradiation light 15 is incident on the next area of the rotation color separation disk 3. The first light flux 17 reflected by the blue reflection area 3B of the disk 3 is reflected by the mirror 6, and is irradiated by the irradiation optical system 7 to display the display element 11.
Is illuminated with blue light on the upper region 20 of. The light beam 16 transmitted through the rotating color separation disk 3 is incident on another rotating color separation disk 4, the second light beam 18 reflected on the red reflection area 4 </ b> R is reflected on the mirror 8, and the display element 11 is irradiated by the irradiation optical system 9. Is illuminated with red. Further, the third light flux 19 transmitted through the red reflection area 4R of the rotating color separation disk 4 is applied to the irradiation optical system 1
With 0, the lower region 22 of the display element 11 is illuminated with green. Therefore, the upper region 20, the central region 21, and the lower region 22 of the display element 11 are irradiated with blue, red, and green light, respectively. Therefore, the image on the display element 11 is shown in FIG.
As shown in (b), a blue image 20B is displayed in the upper area 20 of the display element 11, a red image 21R is displayed in the central area 21, and a green image 22G is displayed in the lower area 22.
Is controlled to be displayed. The display element 11 controlled in this way is irradiated with blue, red, and green light sequentially from the top described above to modulate the light with the image of the display element 11, and the screen 13 is sequentially colored blue, red, and red from the top. , Display a green image.

Similarly, when the rotating color separation disks 3 and 4 are further rotated by the motor 5 in the direction of the arrow in FIG.
As shown in (c), the image of the display element 11 is displayed in the upper area 2.
Since the image becomes a green image 20G, a blue image 21B, and a red image 22R in order from 0, the display element 11 modulates green, blue, and red light, so that green,
Blue and red images are displayed.

The above corresponds to one field of an image. Since the images in the upper, central, and lower regions of the display element 11 display red, blue, and green images, respectively, An image of all colors shown in FIG. 4D can be provided.

Each of the regions 20 on the display element 11 described above,
The change in the color of the light emitted to the light sources 21 and 22 can be represented as shown in FIG. FIG. 4A shows a red light in the upper region 20, a green light in the central region 21 when the display of FIG.
This indicates that the lower region 22 is irradiated with blue light. Similarly, at the time of display in FIG.
Blue light, red light and green light are respectively applied to the display elements 11 and 22.
, And at the time of the display of FIG.
This indicates that the display element 11 is irradiated with red light.

In the projector according to the present invention, the use of light emitted from the light source 1 of the lamp is not time-serial color separation in the case of the prior art, but is time-parallel color separation. Is improved, and a bright image (high-brightness image) can be obtained.

In the above embodiment, the light of the lamp light source 1
At the time of color separation, two rotating color separation disks which divide the wavelength range of the filter into three types perform color separation with two sheets. This means that lamps other than three colors can be similarly separated.
Assuming that the number of light in the wavelength range that separates the light of n is n, the circumference of n-1 substantially circular disks is divided into n, and each divided portion has a color separation function of reflecting light in a predetermined wavelength range, A group of disks is formed by stacking n-1 substantially circular disks at regular intervals.
A luminous flux obtained by sequentially reflecting light from a first disc to an (n-1) th disc into a luminous flux in a predetermined wavelength range, and a luminous flux passing through the (n-1) th disc and being selected in a predetermined wavelength range. With the obtained luminous flux, it is possible to obtain n pieces of light in a predetermined wavelength range. By rotating the group of disks, the first disk of the group of disks is irradiated with light from the lamp light source 1 at an incident angle of about 45 degrees, and has a predetermined wavelength range of 1 to n obtained from the group of disks. Light is applied to a predetermined area of the display element. Further, the disk group is rotated so that the light applied to a predetermined region of the display element irradiates light in different wavelength ranges in the order of the wavelength range obtained by dividing the disk. Also in this projector, as described in detail in the embodiment, since the use of light emitted from the lamp is not time-serial color separation in the case of the related art, but is time-parallel color separation, It goes without saying that the light use efficiency is improved compared to the conventional art, and a bright image is obtained.

In the above color separation, the luminous flux transmitted through the final stage of the rotating color separation disk is used. However, the number of rotating color separation disks is increased by one, and the luminous flux reflected by the final stage of the rotating color separation disk is used. The same effect is obtained even if used.

A second embodiment of the projector according to the present invention will be described below with reference to FIGS. FIG. 6 is a schematic diagram showing an embodiment of a main part configuration of a second embodiment of the projector according to the present invention. 7 (a) to 7
FIG. 7C is a schematic diagram for explaining a color separation mechanism of the projector shown in FIG. The second embodiment is the first
The color separation method is different from that of the embodiment. In the figure, 2
Reference numerals 4, 25, and 26 denote filters that reflect light in a predetermined wavelength range, where 24 is a red reflection filter, 25 is a green reflection filter, and 26 is a blue reflection filter. Other member names and numbers are the same as in the first embodiment.

In the projector, irradiation light emitted from a light source 1 of a lamp using a metal halide lamp or the like is advanced forward by a condensing reflector 2 having a reflection film formed on a heat-resistant material such as glass. Irradiation light is red reflection filter 2
4. The light enters the green reflection filter 25 and the blue reflection filter 26, and reflects the red, green, and blue light beams, respectively. Each of the filters 24, 25 and 26 reflects the reflected light on the display element 1
1 is arranged so as to irradiate an area divided into three. The light applied to the display element 11 is modulated by the image on the display surface,
The light is emitted from the display element 11. The emitted light is magnified and projected on a screen 13 by a projection lens 12 or the like, and provides an image to a viewer.

Each of the filters 24 to 26 has a function of changing the angle of reflection (this is a function of driving the angle by a driving force of an electromagnet, a motor, or the like, and may be any mechanism. No.) FIG.
As shown in (a), in the first period in which one field of an image is divided into three, the red reflection filter 24 irradiates the upper region of the display element 11 with a light beam of red 24R, and the light transmitted through the red reflection filter 24. Are reflected by the green reflection filter 25 and further transmitted through the red reflection filter 24,
Is irradiated with a luminous flux of 25G in green, and a blue reflection filter 26 similarly applies blue light to a lower region of the display element 11.
The light beam of B is applied. In the second period, as shown in FIG. 7B, blue 26
The reflection angle of each of the filters 24 to 26 is controlled so as to be B, red 24R, and green 25G. In the third period, as shown in FIG. 7C, the reflection angles of the filters 24 to 25 are controlled so that the color becomes 25 G, 26 B, and 24 R in order from the upper region of the display element 11.

The light irradiated on the display element is modulated by the image on the display surface of the display element 11 in the same manner as described in the first embodiment, and the light emitted from the display element 11 is projected by the projection lens 12 or the like. The image is enlarged and projected on the screen 13 to provide an image to a viewer. The first to third periods correspond to one field of an image, and the images in the upper, central, and lower regions of the display element 11 each display red, blue, and green images within one field period. The viewer can be provided with images of all colors as described in the first embodiment. As described above, since the projector according to the second embodiment of the present invention performs temporally parallel color separation instead of temporally serial color separation as in the related art, light is emitted from the lamp light source. Since the light use efficiency is improved as compared with the related art, a bright image can be obtained.

In the above embodiment, when separating the lamp light into three colors, three filters having different wavelength ranges are used. However, the present invention is not limited to the three-color separation. The means for separating the light of the lamp light source into a plurality of light fluxes having a plurality of wavelength ranges is such that, assuming that the number of lights in the wavelength range to be separated is n, a predetermined number of color separation filters for reflecting light in the n predetermined wavelength ranges are provided. Overlapping at intervals, the light incident on these filters is arranged so that light of a predetermined wavelength range is selected from the first filter to the n-th filter and reflected toward the display element, and all the predetermined wavelength ranges are reflected. It is needless to say that the same effect can be obtained if the arrangement angle of the filter is changed at regular time intervals so that the light having the above is irradiated on a predetermined area of the display element.

Hereinafter, a third embodiment of the projector according to the present invention will be described with reference to FIG. FIG. 8 is a schematic diagram showing a main part configuration of a third embodiment of the projector according to the present invention. The embodiment of FIG. 8 differs from the second embodiment in that the display element 11 is replaced with a reflection type. In the figure, reference numeral 27 denotes a reflective display element, and the names and numbers of other members are the same as in the second embodiment. In this projector, irradiation light emitted from a light source 1 of a lamp using a metal halide lamp or the like is advanced forward by a condensing reflector 2 having a reflection film formed on a heat-resistant material such as glass.

The irradiation light enters the red reflection filter 24, the green reflection filter 25, and the blue reflection filter 26, and the red, green, and blue light fluxes are respectively reflected. Each filter is disposed so that the reflected light is applied to a region obtained by dividing the display element 27 into three. The light applied to the display element 27 is modulated by the image on the display surface, reflected from the display element 27, and enlarged and projected on the screen 13 by the projection lens 12 or the like to provide an image to a viewer. In this configuration, the functions and operations of each unit are the same as those of the second embodiment except that the light is reflected by the display element 27, and thus the detailed description is omitted.

Also in the projector according to the third embodiment configured as described above, the light emitted from the lamp light source is not time-separated in time as in the prior art, but is temporally separated. Because the colors are separated in parallel,
Light utilization efficiency is improved compared to the conventional art, and a bright image is obtained.

Further, even when the color separation method using the rotating color separation disk described in the first embodiment is used for a reflective display element, the light incident on the reflective display element is time-varying as in the present embodiment. Since the colors are color-separated in parallel, the light use efficiency is improved as compared with the related art, and a bright image is obtained.

The display element used in the present invention may be any element as long as it modulates light. As such an element, for example, an element that controls the transmittance by changing the polarization characteristic of light described in the Journal of the Institute of Image Information and Television Engineers (Vol. 51, No. 4, p417), or a number of minute mirrors There is a display element that reflects light and modulates it. It goes without saying that the effects described in detail in the embodiments can be obtained by using the display element that modulates light.

The screen may be a reflection type screen for viewing the reflected image light or a transmission type screen for viewing the transmitted image light, and is emitted from the projection lens to reach the screen. It is apparent that the effect of the present invention is not impaired even if a mirror that bends the optical path or a lens that condenses image light in the viewing direction is interposed in the path.

In the embodiment, the main optical components are illustrated only for easy understanding of the present invention.
It is needless to say that the same effect can be obtained even if there is an optical component for averaging the light intensity distribution of the lamp or an optical member such as a condenser lens for improving the light condensing performance on the projection lens.

In the embodiment, the display surface of the display element is irradiated with light by dividing the display surface into three parts in the vertical direction. However, the present invention is not limited to the vertical direction. Irradiating with light has no effect.

Further, when irradiating the color-separated light to a predetermined area of the display element, depending on the light-condensing method, the light of the adjacent area is mixed at the boundary of the area, thereby deteriorating the quality of the projected image. . In such a case, the display element is set in advance by setting the drive of the display element in advance, for example, by graying the image of the display element in the mixed color area or adjusting the brightness of the mixed color area to the brightness near the mixed color area. Can be made inconspicuous.

As described above, according to the present invention, the light of the lamp is separated into a plurality of light beams having a predetermined wavelength range, and the separated light beams are applied to the light irradiation surface of the display element by the plurality of light beams. Irradiation is sequentially performed on the divided regions. The projector was configured such that the display element modulates each of the regions to be irradiated with a plurality of luminous fluxes according to the light in the wavelength range, and enlarges and projects the modulated light onto a screen to obtain an image.

Here, in order to separate light beams having a plurality of predetermined wavelength ranges, the circumference of a plurality of substantially circular disks is divided, and each divided portion is provided with a color separation function of reflecting light in a predetermined wavelength range. The discs are stacked at regular intervals to form a disc group, and the disc group is rotated to selectively reflect light from a first disc to a final disc in a predetermined wavelength range. Alternatively, a plurality of color separation filters that reflect light in a predetermined wavelength range are overlapped at a predetermined interval, and light incident on this filter is
Light of a predetermined wavelength range is selected from the first filter to the n-th filter sequentially and reflected toward the display element.
With this configuration, the light use efficiency can be improved.

[0042]

As described above, according to the projector of the present invention, the light emitted from the lamp light source is not color-separated in time series as in the prior art.
Since color separation is performed in parallel in time, light use efficiency is improved, and a bright image is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a main configuration of a first embodiment of a projector according to the present invention.

FIG. 2 is a schematic diagram for explaining the principle of separating irradiation light into a predetermined wavelength range in the projector according to the present invention.

FIG. 3 is a top view showing one embodiment of the rotating color separation disk of the projector according to the present invention.

FIG. 4 is a schematic diagram showing an image on the display element for one field and a schematic view showing an image on the display element when these screens are combined.

FIG. 5 is a characteristic diagram showing a change over time of light irradiated on a display element.

FIG. 6 is a schematic diagram showing an example of a configuration of a main part of a second embodiment of the projector according to the present invention.

FIG. 7 is a schematic diagram for explaining a color separation mechanism of the projector shown in FIG.

FIG. 8 is a schematic diagram showing a main configuration of a third embodiment of the projector according to the present invention.

FIG. 9 is a schematic diagram showing a main part configuration diagram of a conventional projector.

FIG. 10 is a top view of a conventional rotating color separation disk.

FIG. 11 is a schematic diagram showing an image on a display element that has transmitted a red transmission area, a green transmission area, and a blue transmission area of a rotating color separation disk during one field, and an image on the display element when these screens are combined. FIG.

[Explanation of symbols]

1. Lamp light source, 2. Condensing reflector, 3, 4, 29 ...
Rotating color separation disk, 5, 30 ... motor for driving, 6, 8 ...
Reflection mirror, 7, 9, 10 ... irradiation optical system, 11, 27 ...
Display element, 12: Projection lens, 13: Screen, 1
4, 31 ... display element drive circuit, 15, 16, 17, 1
8, 19, 28 ... luminous flux, 24, 25, 26 ... filter.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideo Tanide 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term in the Multimedia System Development Division, Hitachi, Ltd. (Reference) 2H048 AA01 AA12 AA19 AA26 FA01 FA15 FA22 2H059 AA38

Claims (17)

[Claims] 1. A light source comprising: a light source; means for separating light from the light source into a plurality of light beams having different wavelength ranges; and a plurality of regions to which each of the plurality of light beams is irradiated. A display element that modulates the light in accordance with an image and emits the light, and a unit that moves the separation unit such that the plurality of light fluxes are sequentially irradiated to the respective regions. 2. The projector according to claim 1, wherein
The projector according to claim 1, wherein the means for separating the light beam includes a disk group provided with a plurality of disks having a plurality of filters capable of obtaining a plurality of light beams in different wavelength ranges. 3. The projector according to claim 2, wherein
2. The projector according to claim 1, wherein said moving means is means for simultaneously rotating said group of disks. 4. The projector according to claim 1, wherein
2. The projector according to claim 1, wherein the means for separating the light flux includes a plurality of filters arranged at intervals and reflecting light in different wavelength ranges. 5. The projector according to claim 4, wherein
The projector, wherein the moving means is means for moving each of the filters so as to change an emission angle of a light beam reflected from the plurality of filters. 6. The projector according to claim 1, wherein
The said display element is a transmission type display element, The projector characterized by the above-mentioned. 7. The projector according to claim 1, wherein
The said display element is a reflective display element, The projector characterized by the above-mentioned. 8. The projector according to claim 1, wherein
The display element has a display surface having an n-divided area, and the separating means is a group of n (positive integers) disks reflecting n light beams in different wavelength ranges and stacked at intervals. Wherein the moving means rotates the group of disks to change the wavelength range of the light flux obtained from each disk, the light being reflected from each disk being emitted in a different wavelength range to the display surface. A projector. 9. The projector according to claim 1, wherein
The display element includes a display surface having an n-divided region, and the separating unit includes n (positive integers) n-1 discs reflecting light beams in different wavelength ranges and spaced apart from each other. A disk group is provided, and a light beam reflected from the n-1 disks and a light beam transmitted through a disk through which light passes last among the disk groups are irradiated to each area of the display surface. The moving means for changing the wavelength range of the luminous flux obtained from each disk is means for rotating the group of disks. 10. The projector according to claim 1, wherein a period during which each of the plurality of light beams is irradiated on each of the regions is an integral multiple of one field. 11. A light source of a lamp is sequentially separated into light beams having a plurality of different wavelength ranges, and the separated light beams are sequentially irradiated on substantially the entire light irradiation surface of the display element so that the display element converts light into an image. A projector that obtains an image by enlarging and projecting the modulated light onto a screen, wherein a plurality of light beams having different wavelength ranges are substantially simultaneously separated from the light source, and the separated light beams are irradiated onto a light irradiation surface of the display element. Irradiates each region divided into the same number of regions as the number of the plurality of luminous fluxes and sequentially irradiates the plurality of luminous fluxes to the respective regions. A projector, wherein the light in the wavelength range is modulated according to an image during a period in which the light in the wavelength range is irradiated. 12. A projector according to claim 11, wherein said means for substantially simultaneously separating said plurality of light beams having different wavelength ranges comprises n substantially discs, where n is the number of light beams in the wavelength range to be separated. Is divided into n portions, each divided portion is provided with a color separation function of reflecting light in a predetermined wavelength range, and the n substantially circular disks are stacked at regular intervals to form a disk group. The circumferential position of each disk is adjusted so that light is sequentially reflected in a predetermined wavelength range from the third disk to the n-th disk, and the light of the lamp is applied to the first disk of the disk group. Irradiating at an incident angle of about 45 degrees, irradiating each region of the display element with light having a predetermined wavelength range of 1 to n obtained from each of the disks, and rotating the disk group,
A projector characterized by being arranged so as to irradiate light of different wavelength ranges in the wavelength range obtained by dividing the disk into the respective areas of the display element. 13. A projector according to claim 11, wherein said means for substantially simultaneously separating a plurality of light beams having different wavelength ranges comprises n-1 light beams, where n is the number of light beams in the wavelength range to be separated. The circumference of the disk is divided into n parts, and each divided part is provided with a color separation function of reflecting light in a predetermined wavelength range.
-1 discs are stacked at regular intervals to form a disc group, and light fluxes of different wavelength ranges are selectively reflected sequentially from the first disc to the (n-1) th disc in the disc group. The plurality of luminous fluxes and the luminous flux of a wavelength range different from the luminous flux passing through the (n-1) -th piece are aligned with each other in the circumferential position of each disk, and the first disk of the disk group is arranged. Irradiating the light of the lamp at an incident angle of about 45 degrees, irradiating light having a predetermined wavelength range of 1 to n obtained from the disk group to each area of the display element, A projector, wherein the projector is arranged so as to be rotated so that light applied to each of the regions of the display element is applied in the order of the luminous flux in a wavelength range obtained by dividing a disk. 14. The projector according to claim 12, wherein the plurality of light beams are applied to the respective regions of the display element, and an image is obtained during a period in which the plurality of light beams are all applied to the respective regions. A projector characterized by being a positive integer multiple of a field. 15. A projector according to claim 11, wherein said means for separating the plurality of light beams having different wavelength ranges substantially simultaneously comprises n sheets of predetermined wavelengths, where n is the number of lights in the wavelength range to be separated. A color separation filter that reflects light in a range is overlapped at a predetermined interval, a plurality of light beams in the different wavelength ranges are obtained by the n filters, and the obtained light beams are arranged to be reflected toward the display element. A projector characterized in that the arrangement angles of the filters are changed at regular time intervals so that light having light fluxes in all different wavelength ranges is applied to the respective regions of the display element. 16. The projector according to claim 15, wherein a period during which each of the plurality of light beams is irradiated on each of the regions is a positive integer multiple of one field for obtaining an image. 17. The method of claim 11, 12, 13, 14, 15,
17. The projector according to claim 16, wherein the plurality of different wavelength ranges are three types of wavelength ranges of red light, blue light, and green light, and one side of the region that irradiates the light flux of the display element is displayed. A projector characterized in that the long side of the display surface of the element is approximately equal to three and the other side is the short side of the display surface of the display element.