JP2009222741A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve color reproduction suitable for display of an image including various contents in an image display device using a color wheel. <P>SOLUTION: The image display device 1 includes: a light source 10; the color wheel 30 equipped with a first color system part 310 provided at a position of a distance r1 from a rotary shaft Ax and a second color system part 320 provided at a position of a distance r2 from the rotary shaft Ax; a switching part 50 switching a first state where light is radiated to the first color system part 310 and a second state where light is radiated to the second color system part 320 by changing the position of the color wheel; and an image forming part 70 making a change in intensity to the light in accordance with an image to be displayed. The first color system part 310 includes n (n is an integer ≥2) first monochrome parts for emitting light beams of n colors of the first color system, and the second color system part 320 includes m (m is an integer ≥2. n≠m) second monochrome parts for emitting light beams of m colors of the second color system. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image display device using a color wheel.

  Conventionally, there are image display devices that use a color wheel to generate basic colors. Such an image display device, for example, colors light emitted from a light source with a color wheel, and repeatedly generates color light of three colors of red, green, and blue in time series. Then, the image display apparatus reflects a part of the colored light using a large number of minute mirrors, and projects the reflected light onto the screen. As a result, red, green, and blue color light images are sequentially displayed on the screen. To the human eye, the image on the screen is recognized as a color image in which images of red, green and blue color lights are superimposed.

  In one prior art, the color wheel is movable laterally and has two coaxial rings of different filters. The colors produced by the first filtering are R, G and B. The colors produced by the second filtering are R ', G' and B '. One of the filter rings filters light according to the position of the color wheel along the lateral passage (Patent Document 1).

US Pat. No. 5,650,832

  However, in the image display device described above, no consideration has been given to what type of filtering should be combined. The configuration of the color wheel can be a wide problem in an image display device that displays an image using a color wheel that sequentially generates a plurality of colored lights of fixed colors.

  An object of the present invention is to perform color reproduction suitable for displaying images of various contents in an image display device using a color wheel.

  In order to handle at least a part of the above object, the present invention employs the following configuration in an image display apparatus as one aspect. That is, the image display device includes a light source that emits light, and a color wheel that sequentially receives light of a plurality of colors in response to the light emitted from the light source. A first color series unit for emitting light of a color of the first color series provided at a position having a distance, and a position having a second distance different from the first distance from the rotation axis A second color series unit for emitting light of a color of the second color series, and changing a relative position of the color wheel with respect to the light emitted by the light source, A switching unit capable of switching between a first state in which the light is applied to the first color series unit and a second state in which the light is applied to the second color series unit; When the light emitted from the light source is received, The first color series unit includes: an image forming unit that can change the intensity of the light according to an image to be displayed by emitting another part without emitting N first monochromatic portions for emitting light of n colors (n is an integer of 2 or more) in the first color series, each of which emits light of one color. The second color sequence unit emits light of m colors (m is an integer equal to or greater than 2 and different from n) in the second color sequence. The image display device includes m second single-color portions for the purpose, each of which includes m second single-color portions that emit light of one color.

  According to this aspect, in a state where light is emitted to a color series portion including a larger number of single color portions, color light which cannot be emitted in a state where light is emitted to a color sequence portion including fewer monochromatic portions. Can be used to express a wider range of colors. On the other hand, in a state where light is emitted to a color series portion having fewer single color portions, there is little change in the type of color light used in reproducing each color. For this reason, more natural gradation expression can be performed. Therefore, according to the above aspect, it is possible to perform color reproduction suitable for displaying images of various contents by switching between the two states. Note that the first color series and the second color series may partially include the same color.

  The n first single color portions include a white portion for emitting white light and a plurality of first chromatic color portions for emitting light of a plurality of different chromatic colors. The m second single color portions do not include a white portion for emitting white light, but include a plurality of second chromatic color portions for emitting light of a plurality of different chromatic colors. It is also preferable that

  With such an aspect, in the first state, the light from the white portion is further added to various colors realized by a combination of a plurality of chromatic colors included in the first color series, The color of the image can be expressed. Therefore, a color with high brightness can be reproduced.

  Further, in the second state, when reproducing colors having the same hue and saturation and differing only in lightness, white light is used to reproduce a color brighter than a predetermined value, and a brightness lower than the predetermined value is used. There is no situation where white light is not used in color reproduction. For this reason, it is possible to express a natural color according to the gradation.

  In other words, the above-described aspect is suitable for displaying each image, both when displaying an image that emphasizes natural gradation expression and when displaying an image that emphasizes brightness. Color reproduction can be performed. In the above aspect, it is also preferable that m <n.

  The first chromatic color portion includes a first red portion for emitting red light, a first green portion for emitting green light, and a first red portion for emitting blue light. The second chromatic color portion includes a second red portion for emitting red light, a second green portion for emitting green light, and a blue portion. A second blue portion for emitting light, and when the image forming portion expresses white in the first state, the portion corresponding to each other is expressed by the first red portion. Red light, the green light by the first green part, the blue light by the first blue part, and the white light by the white part are continuously emitted, and the second light When expressing white in the state, the red light by the second red part, the green light by the second green part, and the corresponding parts, The light of the blue by two blue section, and emits continuously, it is also preferable to an embodiment that.

  In such a mode, in the first state, brighter white than in the second state can be reproduced by adding light from the white portion. For this reason, for example, in presentations where characters, tables, graphs, etc. are often displayed on a white background, images are displayed in the first state, for example, natural gradation expression of colors, such as introduction of art works and landscapes. For an image that should be emphasized, the image can be displayed in the second state. As a result, it is possible to perform high-quality display according to the contents of the images to be displayed.

  Note that the red light emitted from the first red portion and the red light emitted from the second red portion do not have to have the same spectral distribution. The green light emitted from the first green part and the green light emitted from the second green part may not be light having the same spectral distribution. The blue light emitted from the first blue portion and the blue light emitted from the second blue portion may not be light having the same spectral distribution.

  The color wheel is further provided at a position having a third distance different from the first and second distances from the rotation axis, and light of a color of a third color series including a plurality of achromatic colors. A third color series unit for emitting light, and the switching unit changes a relative position of the color wheel with respect to the light emitted by the light source, whereby the light is transmitted to the third color series unit. It is also preferable that the third state to be irradiated, the first state, and the second state can be switched.

  With such an aspect, when displaying an image that should emphasize the gradation expression of brightness for an achromatic color, or when displaying an image that should emphasize natural gradation expression for a chromatic color, Even when displaying images that should be emphasized in brightness, it is possible to reproduce colors suitable for displaying each image.

  Note that the image display device as one embodiment of the present invention may have the following configuration. In other words, the image display device includes a light source that emits light, and a color wheel that sequentially receives light of a plurality of colors in response to the light emitted from the light source, and the first color wheel rotates from the rotation axis of the color wheel. A first color series unit for emitting light of a color of the first color series provided at a position having a distance, and a position having a second distance different from the first distance from the rotation axis A second color series unit for emitting light of a color of the second color series, and changing a relative position of the color wheel with respect to the light emitted by the light source, A switching unit capable of switching between a first state in which the light is applied to the first color series unit and a second state in which the light is applied to the second color series unit; When the light emitted from the light source is received, And an image forming unit that can change the intensity of the light according to an image to be displayed by emitting another part of the first color series. And the second color series includes a plurality of chromatic colors having different hues from each other.

  According to such an aspect, in the first state, a black and white image in which the object is displayed by light and dark can be displayed using a plurality of achromatic light. And in a 2nd state, the color image in which a target object is displayed with a different color can be displayed using several chromatic color light from which a hue differs. Therefore, according to the image display device described above, it is possible to reproduce colors suitable for display of images of various contents.

  The first color series does not include a chromatic color, includes a first gray and a second gray that is darker than the first gray, and the second color series includes a plurality of achromatic colors. It is also preferable to adopt an embodiment in which red, blue, and green are included.

  In the first color series portion of the color wheel, a part of the angle range around the rotation axis of the color wheel is not used for chromatic colors. For this reason, the bright part of a monochrome image can be projected brightly. Further, in the second color series portion of the color wheel, a part of the angular range around the rotation axis of the color wheel is not used for two or more achromatic colors. For this reason, the bright part of a color image can be projected brightly. Therefore, according to the above aspect, it is possible to switch between display of an image excellent in expressing an achromatic image and display of an image excellent in expressing a chromatic image.

  The present invention can be realized in various forms, for example, an image display method and an image display device, a control method and a control device for image display, and a computer for realizing the functions of these methods or devices. The present invention can be realized in the form of a program, a recording medium recording the computer program, a data signal including the computer program and embodied in a carrier wave, and the like.

A. First embodiment:
A1. Device configuration:
FIG. 1 is a diagram showing a projector 1 according to the first embodiment. FIG. 1 shows a first state of the projector 1 of the first embodiment. In FIG. 1, the main configuration of the projector 1 is shown on the right side, and the relationship between the color wheel 30 and the range LS irradiated with the light L is shown on the left side. The projector 1 includes a lamp 10, a light shielding plate 20, a color wheel 30, a motor 40, a switching unit 50, an optical system 60, a DMD (Digital Micro Mirror Device) 70, an optical system 80, and a control unit 90. And have.

  The lamp 10 is a high-pressure mercury lamp. The lamp 10 emits light L toward the light shielding plate 20. The light L emitted from the lamp 10 is substantially white light.

  The light shielding plate 20 includes an aperture 210. The light shielding plate 20 receives the light L emitted from the lamp 10 and allows the aperture 210 to pass through a part thereof. The light L that has passed through the aperture 210 is applied to the color wheel 30.

  FIG. 2 is a plan view of the color wheel 30. The color wheel 30 is rotated by a motor 40 (see FIG. 1). The color wheel 30 is arranged in a ring shape at a position r2 (r2 <r1) from the rotation axis Ax and a first color series unit 310 arranged in a ring shape at a position r1 from the rotation axis Ax. 2 color series part 320. The distance from the rotation axis Ax is measured by the shortest distance from the rotation axis Ax to the portion of each color series unit that can receive light and emit color light. In FIG. 2, the first color series unit 310 and the second color series unit 320 are not hatched in order to facilitate understanding of the configuration of the color wheel 30 (FIG. 1). reference).

  The first color series part 310 and the second color series part 320 are provided with dielectric multilayer films. By the dielectric multilayer film, the light L irradiated to the first color series unit 310 and the second color series unit 320 is colored. Note that the first color series unit 310 also includes a portion that transmits the irradiated light L without giving a color. In FIG. 2, regions on the color wheel 30 to which the light L emitted from the lamp 10 is irradiated are indicated by LS1 and LS2. When the projector 1 is in the first state (see FIG. 1), the range LS irradiated with the light L emitted from the lamp 10 is LS1. When the projector 1 is in a second state to be described later, a range LS irradiated with the light L emitted from the lamp 10 is LS2.

  The first color series unit 310 includes five single color units 311 to 315 that emit light of one color in different angle ranges. The single color portion 311 receives the light L emitted from the lamp 10 and emits red (R) light Lcr. The single color portion 312 receives the light L emitted from the lamp 10 and emits green (G) light Lcg. The single color portion 313 receives the light L emitted from the lamp 10 and emits blue (B) light Lcb. The single color portion 314 receives the light L emitted from the lamp 10 and emits magenta (M) light Lcm. The single color unit 315 receives the light L emitted from the lamp 10 and emits white (W) light Lcw.

  In addition, the code | symbol Lc is used when color light is named generically without distinguishing the color of each color light Lcr, Lcg, Lcb, Lcm, and Lcw. In the present specification, among the single color portions 311 to 315, the single color portions 311 to 314 that emit chromatic color light may be collectively referred to as “first chromatic color portions”.

  The second color series unit 320 includes four single color units 321 to 324 that emit light of one color respectively in different angle ranges. The single color part 321 receives the light L emitted from the lamp 10 and emits red (R) light Lcr. The single color part 322 receives the light L emitted from the lamp 10 and emits blue (B) light Lcb. The single color part 323 receives the light L emitted from the lamp 10 and emits green (G) light Lcg. The single color portion 324 receives the light L emitted from the lamp 10 and emits magenta (M) light Lcm. In the present specification, the single color portions 321 to 324 may be collectively referred to as a “second chromatic color portion”.

  The motor 40 is connected to the center of the color wheel 30 (see FIG. 1). The motor 40 rotates the color wheel 30 about the rotation axis Ax (see arrow Ar in FIG. 2). As a result, when the color wheel 30 receives the light L emitted from the lamp 10 at the position LS1, the color light of red (R), green (G), blue (B), magenta (M), and white (W). Lcr, Lcg, Lcb, Lcm, and Lcw are periodically ejected in that order. When the color wheel 30 receives the light L emitted from the lamp 10 at the position LS2, the color wheel 30 emits red (R), green (G), blue (B), and magenta (M) color lights Lcr, Lcg, Lcb, Lcm is periodically ejected in that order.

  FIG. 3 is a diagram illustrating a second state of the projector 1 according to the first embodiment. As in FIG. 1, in FIG. 3, the main configuration of the projector 1 is shown on the right side, and the relationship between the color wheel 30 and the range LS irradiated with the light L is shown on the left side. The switching unit 50 stretches a carriage 510 on which the motor 40 is loaded, a guide rail 520 for linearly moving the carriage 510, an endless drive belt 540 partially attached to the carriage 510, and the drive belt 540. Pulleys 550 and 550, and a motor 560 that rotates one pulley 550 in both directions.

  When the pulley 550 is rotated in both directions by the motor 560 and the drive belt 540 is driven in both directions, the carriage 510 linearly moves on the guide rail 520 in both directions. As a result, the color wheel 30 and the motor 40 have a first position far from the light L emitted from the lamp 10 (see FIG. 1), and a second position closer to the light L emitted from the lamp 10 than the first position. (See FIG. 3).

  When the color wheel 30 is in the first position, the light L emitted from the lamp 10 is applied to the range LS1 of the color wheel 30 (see FIGS. 1 and 2). When the color wheel 30 is in the second position, the light L emitted from the lamp 10 is applied to the range LS2 of the color wheel 30 (see FIGS. 2 and 3).

  The optical system 60 includes a light pipe 610 and lenses 620, 630, and 640. The optical system 60 transmits the color light Lc emitted from the color wheel 30 to the DMD 70.

  The DMD 70 is an element in which a large number of minute mirrors are arranged in a rectangular shape. Each mirror can be held at two angles. One angle is an angle at which the light Lc received from the optical system 60 can be reflected by the mirror and transmitted to the optical system 80. A state in which light is reflected by the mirror and transmitted to the optical system 80 is referred to as an “ON” state in this specification. The other angle is an angle at which the light Lc received from the optical system 60 is absorbed by the DMD 70 without being reflected by the mirror. A state in which light is not reflected by the mirror and light is not transmitted to the optical system 80 is referred to as an “OFF” state in this specification.

  The DMD 70 is controlled by the control unit 90 to operate the angles of the multiple mirrors. The DMD 70 reflects a part of the light Lc received from the optical system 60 and emits it toward the optical system 80 and absorbs the other part. As a result, the reflected light Li of the color light Lc is provided with a strength change (ON / OFF) according to the image to be displayed. That is, one mirror of the DMD 70 corresponds to one pixel of the projected image.

  The DMD 70 controls each mirror in synchronization with the timing at which the color lights Lcr, Lcg, Lcb, etc. are emitted in order as the color wheel 30 rotates. That is, the DMD 70 switches the intensity change (pattern) attached to the light based on the image in synchronization with the generation timing of the color light by the color wheel 30.

  The optical system 80 is a projection lens. The color light Li reflected by the DMD 70 is projected onto the screen 100 via the optical system 80. On the screen 100, images of colored light such as red (R), green (G), and blue (B) are sequentially projected according to the rotation of the color wheel 30.

  The control unit 90 controls the light source 10, the motor 40, the switching unit 50, the optical system 60, the DMD 70, and the optical system 80. As a result, images of colored light such as red (R), green (G), and blue (B) are sequentially projected on the screen 100. The images of the color lights of the respective colors sequentially projected on the screen are recognized by the human eye as color images generated by superimposing the images of the color lights.

A2. Projector operating mode:
The control unit 90 of the projector 1 can project an image on the screen in the first and second modes. The first mode is a mode suitable for a presentation that often displays a still image with a white background, such as a table, a graph, or a sentence. On the other hand, the second mode is a mode suitable for displaying an image where color gradation expression should be emphasized, such as an introduction of a work of art or a landscape.

  In the first mode, the color wheel 30 is in the first state shown in FIG. That is, it is at a position far from the light L. At this time, the color wheel 30 periodically emits red, green, blue, magenta, and white color lights Lcr, Lcg, Lcb, Lcm, and Lcw in that order (see FIG. 2).

  Of the image to be displayed, the control unit 90 operates the DMD 70 as follows for the portion where white is to be displayed. That is, the red, green, and blue color lights Lcr, Lcg, and Lcb are turned on at a time ratio that cancels each other's color and becomes an achromatic color. Further, the white light Lcw is turned on. The red, green, blue, and white color lights Lcr, Lcg, Lcb, and Lcw are continuously turned on as the color wheel 30 rotates.

  Note that “sequentially emitting a plurality of lights (set to ON)” means that a plurality of lights are emitted at the timing closest to each other along the timing at which each light can be emitted by the color wheel. To do. For example, in the case of “irradiating light A, light B, and light C successively”, “after emitting light A, in a state where light B can be emitted, light B is not emitted, and then light C The case where the light B is emitted after being emitted ”is not included.

  However, it does not matter how long the light is emitted in a state where each light can be emitted. That is, for example, when the light A, the light B, and the light C are emitted in that order, it is not necessary to emit the light B in the entire time during which the light B can be emitted. For example, out of the time during which the light B can be emitted, the light B may not be emitted for a predetermined time, then the light B may be emitted, and then the light C may be emitted.

  Further, in this specification, “emission of the light A, the light B, and the light C continuously” does not mean that the light A, the light B, and the light C are emitted in that order. For example, when it is possible to emit light A, light C, and light B in this order due to the configuration of the color wheel, even if light A, light C, and light B are emitted in this order, And light C are continuously emitted ”. The order of light emission is arbitrary depending on the configuration of the color wheel. That is, “continuous emission of the light A, the light B, and the light C” means that the light A, the light B, and the light C are positioned closest to each other along the timing at which each light can be emitted from the color wheel. Means to inject. The same applies to the case of four or more color lights.

  When the projector 1 is in the second mode, the color wheel 30 is in the second state shown in FIG. That is, the color wheel 30 is closer to the light L than in the first state. At this time, the color wheel 30 periodically emits red, green, blue, and magenta color lights Lcr, Lcg, Lcb, and Lcm in that order (see FIG. 2). Note that the distance between the color wheel and the light is measured by the shortest distance between the rotation axis of the color wheel and the light.

  Of the image to be displayed, the control unit 90 causes the DMD 70 to operate as follows for the portion to display white. That is, the red, green, and blue color lights Lcr, Lcg, and Lcb are turned on at a time ratio that cancels each other and becomes an achromatic color. The red, green, and blue color lights Lcr, Lcg, and Lcb are continuously turned on.

Here, in order to facilitate understanding, an example in which the configuration of the color wheel 30 is simplified is described. The configuration of the color wheel 30 is assumed to be as follows. Also, the description of the processing of the DMD 70 at the boundary of the single color part is omitted for easy understanding.
(I) The single color portions 311 to 315 corresponding to red, green, blue, magenta, and white of the first color series portion 310 are each 1/5 around the rotation axis Ax, that is, 72 around the rotation axis Ax. Suppose that it is provided for a range of degrees.
(Ii) The single color portions 321 to 324 corresponding to red, green, blue, and magenta of the second color series portion 320 are each ¼ around the rotation axis Ax, that is, 90 degrees around the rotation axis Ax. It is assumed that it is provided for the range of.
(Iii) The single color units 311 to 313 of the first color series unit 310 are turned on for the maximum time (72 °) in the DMD 70 by the red, green, and blue color lights Lc emitted from the single color units 311 to 313, respectively. And, it is configured to emit colored light that can cancel each other's colors.
(Iv) The single color portions 321 to 323 of the second color series portion 320 are turned on for the maximum time (90 °) in the DMD 70 by the red, green, and blue color lights Lc emitted from the single color portions 321 to 323, respectively. And, it is configured to emit colored light that can cancel each other's colors.

  In the first mode, the red, green, blue, and white color lights are turned on for the maximum time for the portion where white should be displayed in the image. As a result, the color lights Lir (red), Lig (green), Lib (blue), and Liw (white) from the four single color portions 311 to 314 of 72 ° are turned on. That is, the color light Li is turned on for a time corresponding to a total of 288 ° in the angle range.

  On the other hand, in the second mode, the red, green, and blue color lights Li are set to the maximum time ON for the portion where white should be displayed in the image. As a result, the color lights Lir (red), Lig (green), and Lib (blue) from the three single-color portions 321 to 323 each 90 degrees are turned on. That is, the color light Li is turned on for a time corresponding to a total of 270 ° in the angle range.

  Therefore, a brighter “white” can be reproduced on the screen 100 in the first mode in which the angle range in which the colored light is ON is longer (288 °> 270 °) than in the second mode.

  Note that the brightness of the color light Lcr, Lcg, Lcb, and Lcw emitted from each single color portion actually differs for each color light. In this embodiment, the white light Lcw is the brightest among the color lights Lcr, Lcg, Lcb, and Lcw. Therefore, when expressing “white” on the screen 100, in addition to the red, green, and blue color lights Lir, Lig, and Lib, “white” in the first mode in which the white color light Liw is turned ON is more preferable. Actually, it becomes brighter than “white” reproduced in the second mode at an angle ratio (288 °: 270 °) or more.

  Therefore, the first mode is suitable for presentations that often display still images with a white background, such as tables, graphs, and sentences.

  On the other hand, in the second mode, each color is expressed without using white light. For example, when expressing a gradation in which the hue and saturation are constant and only the brightness is different, white light is not used from the middle of the color change. Therefore, it is possible to express the color change that the viewer can feel naturally. Therefore, the second mode is suitable for displaying images that should emphasize color gradation expression, such as introduction of artworks and natural scenery.

  As described above, the projector according to the first embodiment is excellent in white expression, excellent in the first mode suitable for presentation, and excellent in gradation expression of color, and suitable for introduction of artworks and display of landscapes, etc. And a second mode. For this reason, display of images having different requirements for color reproduction can be realized with one color wheel.

  In the first embodiment, the configuration of the color wheel 30 is simplified as described in (i) to (iv) in order to facilitate understanding. However, even when the color wheel 30 does not have the configuration as described in (i) to (iv) above, the first color series unit including the single color part for emitting white light and the first color series unit In general, a projector including a color wheel that includes the same number of single-color portions as each of the single-color portions other than white light and a second color series portion that does not include a single-color portion that emits white light is described above. The effect which it did can be show | played.

B. Second embodiment:
B1. Device configuration:
FIG. 4 is a plan view of a color wheel 30b included in the projector 1b according to the second embodiment. The projector 1b according to the second embodiment includes a color wheel 30b instead of the color wheel 30 (see FIG. 2). The other points of the second embodiment are the same as those of the first embodiment.

  The color wheel 30b has a third color series unit 330 arranged in an annular shape in place of the second color series unit 320 at a distance r2 from the rotation axis Ax. The color wheel 30b is the same as the color wheel 30 in other configurations. The third color series portion 330 is also provided with a dielectric multilayer film. The brightness of the light L irradiated to the third color series unit 330 is adjusted by the dielectric multilayer film. Also in FIG. 4, in order to facilitate understanding of the configuration of the color wheel 30b, the first color series unit 310 and the third color series unit 330 are shown without hatching (FIG. 1). FIG. 3).

  The third color series unit 330 includes three single-color units 331 to 313 that emit light Lgy, Lgy2, and Lgy3 having different brightness from each other in different angle ranges. The single color part 321 receives the light L emitted from the lamp 10 and emits light Lgy1 having a predetermined brightness. The single color portion 332 receives the light L emitted from the lamp 10 and emits light Lgy2 that is darker than the light Lgy1. The single color portion 332 receives the light L emitted from the lamp 10 and emits light Lgy3 that is darker than the light Lgy2. In addition, when referring to each light Lgy, Lgy2, and Lgy3 without distinction, the code | symbol Lgy is used.

  In the color wheel 30b, the monochrome portion 333 corresponding to the darkest range of black to gray, the monochrome portion 332 corresponding to the middle range of gray, and the monochrome portion 331 corresponding to the brightest range of gray to white have the rotation axis Ax. Each is provided in the center at an angle range of 1/3, that is, 120 degrees.

  The color wheel 30 b is rotated by the motor 40. When the color wheel 30b receives the light L emitted from the lamp 10 at the position LS2, the color wheel 30b periodically emits achromatic light Lgy, Lgy2, Lgy3 in that order (see FIG. 4).

B2. Projector operating mode:
The control unit 90 of the projector 1b can project an image on the screen in the first and second modes. The first mode is a mode for displaying a color image. The first mode of the second embodiment is equal to the first mode of the first embodiment. On the other hand, the second mode of the second embodiment is a mode for displaying a monochrome image.

  In the second mode of the second embodiment, the color wheel 30 is in the second state shown in FIG. In the second mode, the control unit 90 causes the DMD 70 to operate as follows. That is, among the pixels in the monochrome image to be displayed, for the pixel having the gradation value in the range of about 1/3 from the brightest gradation value, the light Lgy1 emitted through the single color portion 331 is used. Expressed. For example, when the brightness of a pixel is expressed by a gradation of 0 to 255 where black is 0 and white is 255, the gradation values 170 to 255 are expressed using the light Lgy1.

  The achromatic colors of the gradation values 170 to 255 are expressed by adjusting the time during which the light Lgy1 is turned on in the DMD 70. That is, the color (white) having the gradation value 255 is expressed by turning on the light Lgy1 for the longest time. The color (gray) of the gradation value 170 is expressed by turning on the light Lgy1 for the shortest time.

  Among pixels in a monochrome image to be displayed, a pixel having a gradation value in a range of about 1/3 from the darkest gradation value is expressed using the light Lgy3 emitted through the single color portion 333. The For example, when the brightness of the pixel is represented by a gradation of 0 to 255, the gradation values 1 to 85 are expressed using the light Lgy3.

  Each achromatic color of gradation values 1 to 85 is expressed by adjusting the time for turning on the light Lgy3. That is, the color (gray) having the gradation value 1 is expressed by turning on the light Lgy3 for the shortest time. A color having a gradation value of 85 (gray) is expressed by turning on the light Lgy3 for the longest time. Note that a color with a gradation value of 0 (black) is realized by not reflecting (not turning on) light in the DMD 70.

  Among the pixels in the monochrome image, the pixel having the gradation value in the middle range of about 1/3 is expressed using the light Lgy2 emitted through the single color portion 332. For example, when the brightness of the pixel is represented by a gradation of 0 to 255, the gradation values 86 to 169 are expressed using the light Lgy3.

  The achromatic colors of the gradation values 86 to 169 are expressed by adjusting the time for turning on the light Lgy2. That is, the color (gray) having the gradation value 86 is expressed by turning on the light Lgy2 for the shortest time. The color (gray) having the gradation value 169 is expressed by turning on the light Lgy2 for the longest time.

  As described above, in the second mode of the second embodiment, the achromatic color gradations are expressed by selectively using the achromatic light by the single color portions in accordance with the brightness of the pixels in the image to be displayed. Therefore, there is a possibility that the user may feel color or flicker in the projected image, like a mode in which a monochrome image is displayed by combining colored light of chromatic colors (red, green, blue, etc.). Low. Therefore, the second mode is suitable for displaying a monochrome photograph or a monochrome movie.

  Further, the third color series portion does not have a single color portion for emitting chromatic color light. Therefore, the projector of the second embodiment can reproduce achromatic light of each gradation using a wide angle range of the color wheel. That is, it is possible to take a long time to turn on each achromatic color light. Therefore, a bright portion of a monochrome image can be expressed brightly as compared with an aspect in which the third color series portion has a single color portion for emitting chromatic light. The second mode is also suitable for displaying a monochrome photograph or a monochrome movie.

  On the other hand, the first color series portion does not have two or more single color portions for emitting achromatic light. For this reason, the chromatic color of each gradation can be reproduced using a wide angle range of the color wheel. That is, it is possible to take a long time to turn on each chromatic color. Therefore, the bright part of the color image can be expressed brightly as compared with the aspect in which the first color series part has two or more single color parts for emitting achromatic light.

  In other words, the projector according to the second embodiment includes a first mode capable of displaying a color image and a second mode suitable for displaying a monochrome photograph or a monochrome movie. For this reason, display of images having different requirements for color reproduction can be realized with one color wheel.

C. Variations:
The present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

C1. Modification 1:
In the embodiment described above, the color wheels 30 and 30b transmit light emitted from the lamp 10 (see FIGS. 1 and 3). However, the color wheel may have other configurations such as a mode in which light emitted from the light source is reflected and transmitted to the downstream optical system. In other words, the color wheel only needs to be configured to receive light emitted from the light source and sequentially emit light of a plurality of different colors while being rotated.

  The single color portion that emits white light may be configured to emit at least part of the received light by irregular reflection. In addition, the single color portion that emits white light may be configured to emit the received light by reflecting or transmitting the light as it is. In addition, each monochromatic part can also be set as the aspect emitted by changing the phase of the received light.

C2. Modification 2:
In the first embodiment, the red light emitted from the single color part 311 of the first color series part 310 and the red light emitted from the single color part 321 of the second color series part 320 are the same red light. . That is, both have the same spectral distribution. However, the red light emitted from the single color part 311 of the first color series part 310 and the red light emitted from the single color part 321 of the second color series part 320 can have different spectral distributions. The same applies to other single color portions that emit corresponding colored light.

  In other words, the first color series part and the second color series part may be provided with a single color part capable of emitting the same color light in part, and may not include a single color part capable of emitting common color light. You can also However, it is preferable that each color series unit has a configuration capable of emitting a plurality of chromatic light beams having different hues. Further, it is more preferable that each color series unit has a configuration capable of emitting light of three or more chromatic colors having different hues. For example, the chromatic colors of these color lights can be red color light, green color light, and blue color light.

  In the above embodiment, the angle ranges in which the single color portions are provided in one color series portion are equal to each other (see FIGS. 2 and 4). However, the angle range in which each single color portion is provided in one color series portion can be different for each color.

  In the above embodiment, the first color series unit emits red (R), green (G), blue (B), magenta (M), and white (W) color lights Lcr, Lcg, Lcb, Lcm, and Lcw. can do. However, the color of chromatic color light that can be emitted by each color series unit can be any color. For example, the color of the colored light can include red and dark red that is darker than red. With such an embodiment, it is possible to express the gradation of red density such as sunset and red vegetables clearly and widely.

  In addition, for example, the color light that can be emitted by the color series unit includes two or more achromatic colors (for example, gray) in addition to three or more chromatic colors such as red (R), green (G), and blue (B). , Darker gray than gray). With such an aspect, it is possible to clearly reproduce the dark part in the color image in a dark underwater scene or a scene where flames are burning at night.

C3. Modification 3:
In the embodiment described above, the color wheels 30 and 30b include two color series parts (see FIGS. 2 and 4). However, the color wheel can also include three or more color series parts. For example, in addition to the first color series unit 310 and the second color series unit 320 in the first embodiment, the first color series unit 310 and the second color series unit 320 have different distances from the rotation axis. It is also possible to adopt a mode in which the third color series unit 330 in the second embodiment is provided at the position.

C4. Modification 4:
In the above embodiment, the relative positions of the color wheel 30, 30b and the light L are changed by changing the position of the color wheel 30, 30b. As a result, the first and second states are realized (see FIGS. 1 and 3). However, the relative position between the color wheel and the light may be changed by changing the position (light path) of the light, and the relative position between the color wheel and the light may be changed by changing the position of both the color wheel and the light. It may be changed.

C5. Modification 5:
In the above-described embodiment, the configuration for changing the strength according to the image to be displayed on the light emitted from the lamp 10 as the light source is a DMD (Digital Micro Mirror Device) which is an element having a large number of minute mirrors. 70. However, the configuration for applying a change in strength to the light emitted from the light source according to the image to be displayed may be another mode. For example, it is equipped with many small shielding plates such as liquid crystal, receives light emitted from the light source, does not transmit part of the light, and transmits the other part, thereby changing the intensity of light according to the image It can also be set as an aspect.

  In other words, the configuration for applying a change in strength to the light emitted from the light source according to the image to be displayed is not received by the light emitted by the light source, and part of the received light is emitted. Any structure can be used as long as the light intensity can be changed according to the image to be displayed.

C6. Modification 6:
In the above embodiment, ON / OFF corresponding to the image to be displayed is provided for the color light emitted from the color wheel 30 by the DMD 70 as the image forming unit. However, after the light emitted from the light source is first turned ON / OFF according to the image to be displayed by the image forming unit, the light may be colored by the color wheel. That is, the color wheel and the image forming unit need only be in a relationship in which one is upstream and the other is downstream in the optical path of the light emitted from the light source.

C7. Modification 7:
In the first embodiment, when white is reproduced on the screen in the first mode, red (R), green (G), blue (B), and white (W) color lights are continuously emitted. . However, when the color wheel is configured to emit color light of a color other than those colors (for example, magenta), when reproducing white on the screen, red (R), green (G), blue (B) Light of colors other than white (W) can also be emitted. However, it is preferable that each chromatic color light is emitted at a ratio that cancels each other and becomes an achromatic color.

C8. Modification 8:
When the image data holds information indicating whether it is monochrome image data, color image image data, landscape images, or image data such as graphs or tables Preferably, the control unit 90 reads the information and automatically switches between the first mode and the second mode based on the information. As a standard that defines a method for storing information about an image as described above in image data, for example, there is Exif (Exchangeable Image File Format).

C9. Modification 9:
In the above embodiment, a part of the configuration realized by hardware may be replaced with software, and conversely, a part of the configuration realized by software may be replaced by hardware. For example, a part of the function of the control unit 90 may be executed by a host computer connected to the projector and controlling the projector.

  A computer program for realizing such a function is provided in a form recorded on a computer-readable recording medium such as a floppy disk or a CD-ROM. The host computer reads the computer program from the recording medium and transfers it to the internal storage device or the external storage device. Alternatively, the computer program may be supplied from the program supply device to the host computer via a communication path. When realizing the function of the computer program, the computer program stored in the internal storage device is executed by the microprocessor of the host computer. Further, the host computer may directly execute the computer program recorded on the recording medium.

  In this specification, the host computer is a concept including a hardware device and an operation system, and means a hardware device that operates under the control of the operation system. The computer program causes such a host computer to realize the functions of the above-described units. Note that some of the functions described above may be realized by an operation system instead of an application program.

  In the present invention, the “computer-readable recording medium” is not limited to a portable recording medium such as a flexible disk or a CD-ROM, but an internal storage device in a computer such as various RAMs and ROMs, An external storage device fixed to a computer such as a hard disk is also included.

The figure which shows the 1st state of the projector 1 of 1st Example. The top view of the color wheel 30. FIG. The figure which shows the 2nd state of the projector 1 of 1st Example. The top view of the color wheel 30b which the projector 1b of 2nd Example has.

Explanation of symbols

      DESCRIPTION OF SYMBOLS 1,1b ... Projector, 10 ... Lamp, 20 ... Light-shielding plate, 30, 30b ... Color wheel, 40 ... Motor, 50 ... Switching part, 60 ... Optical system, 70 ... DMD (Digital Micro Mirror Device), 80 ... Optical system , 90 ... control unit, 100 ... screen, 210 ... aperture, 310 ... first color series part, 311 ... single color part for emitting red color light, 312 ... single color part for emitting green color light, 313 ... blue color light ,... 314... A single color part that emits magenta color light, 315... A single color part that emits white light, 320... A second color series part, 321. A single color portion for emitting the color light, 323... A single color portion for emitting the blue color light, 324... A single color portion for emitting the magenta color light, 330. 332 ... intermediate Single color portion for emitting light of light, 333... Single color portion for emitting the darkest light, 510... Carriage, 520... Guide rail, 540. 630, 640 ... lens, Ax ... rotation axis of the color wheel 30, L ... light emitted by the lamp, LS ... light emitted by the lamp, LS1 ... light emitted from the lamp in the first mode Range, LS2: Range in which the light of the lamp is irradiated in the second mode, Lc: Color light, Li: Color light to which light and darkness is given by the image, r1: Distance from the rotation axis Ax to the first color series portion, r2 ... Distance from rotation axis Ax to second and third color series parts

Claims (6)

An image display device,
A light source that emits light;
A color wheel that receives the light emitted from the light source and sequentially emits light of a plurality of colors, and is provided at a position having a first distance from a rotation axis of the color wheel. A first color series unit for emitting light, and a second color series unit that emits light of a color of the second color series, provided at a position having a second distance different from the first distance from the rotation axis A color wheel comprising: a second color series part;
By changing the relative position of the color wheel with respect to the light emitted from the light source, a first state in which the light is applied to the first color series unit, and the light is the second color series unit. A switching unit capable of switching between the second state irradiated to
By receiving the light emitted by the light source and not emitting part of the light and emitting the other part, an image that can change the intensity of the light according to the image to be displayed A forming part,
The first color series part is:
N first monochromatic portions for emitting light of n colors (n is an integer of 2 or more) in the first color series, each of which emits light of one color. A first monochromatic portion;
The second color series part is:
M second monochromatic portions for emitting light of m colors (m is an integer equal to or greater than 2 and different from n) in the second color series, each of which is 1 An image display device comprising m second single color portions for emitting colored light. The image display device according to claim 1,
The n first monochrome portions are:
A white part for emitting white light;
A plurality of first chromatic color portions for emitting light of a plurality of chromatic colors different from each other;
The m second single color portions are:
Does not include the white part for emitting white light,
An image display device including a plurality of second chromatic color portions for emitting light of a plurality of chromatic colors different from each other. The image display device according to claim 2,
The first chromatic portion is
A first red portion for emitting red light;
A first green part for emitting green light;
A first blue portion for emitting blue light,
The second chromatic portion is
A second red part for emitting red light;
A second green part for emitting green light;
A second blue portion for emitting blue light,
The image forming unit
When expressing white in the first state, the red light from the first red part, the green light from the first green part, and the first The blue light from the blue part and the white light from the white part are continuously emitted,
When expressing white in the second state, the red light from the second red part, the green light from the second green part, and the second An image display device that continuously emits the blue light from the blue portion. The image display device according to claim 2,
The color wheel is further provided at a position having a third distance different from the first and second distances from the rotation axis, and emits light of a color of a third color series including a plurality of achromatic colors. A third color series part for
The switching unit is configured to change a relative position of the color wheel with respect to the light emitted from the light source, so that the light is irradiated on the third color series unit, and the first state. And an image display device capable of switching between the second state and the second state. An image display device,
A light source that emits light;
A color wheel that receives the light emitted from the light source and sequentially emits light of a plurality of colors, and is provided at a position having a first distance from a rotation axis of the color wheel. A first color series unit for emitting light, and a second color series unit that emits light of a color of the second color series, provided at a position having a second distance different from the first distance from the rotation axis A color wheel comprising: a second color series part;
By changing the relative position of the color wheel with respect to the light emitted from the light source, a first state in which the light is applied to the first color series unit, and the light is the second color series unit. A switching unit capable of switching between the second state irradiated to
By receiving the light emitted by the light source and not emitting part of the light and emitting the other part, an image that can change the intensity of the light according to the image to be displayed A forming part,
The first color series includes a plurality of achromatic colors;
The image display device, wherein the second color series includes a plurality of chromatic colors having different hues. The image display device according to claim 5,
The first color series does not include a chromatic color, includes a first gray and a second gray that is darker than the first gray;
The image display device, wherein the second color series does not include a plurality of achromatic colors but includes red, blue, and green.

Images