JP2008089889A - Projection type video display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type video display apparatus capable of suppressing the increase of apparatus cost as a whole even if light rays of four or more different colors are used. <P>SOLUTION: The projection type video display apparatus 100 includes: a dichroic cube 40A for combining two or more color component light rays of four or more color component light rays; a dichroic cube 40B for combining two or more color component light rays of the four or more color component light rays; a projection lens unit 110A that projects the light rays combined by the dichroic cube 40A; and a projection lens unit 110B that projects light rays combined by the dichroic cube 40B. Either one of the dichroic cube 40A or 40B combines, out of the four or more color light rays, the color component light rays the wavelength regions of which are not adjacent to each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a projection display apparatus that uses four or more color component lights.

  Conventionally, it has three light modulation elements corresponding to three colors of light, a cross dichroic cube that combines light emitted from the three light modulation elements, and a projection lens that projects light combined by the cross dichroic cube Projection-type image display devices are known.

  Here, the cross dichroic cube has three light incident surfaces on which light is incident and one light emitting surface from which light is emitted. Accordingly, when the light incident on the cross dichroic cube has three colors, the projection display apparatus only needs to have one cross dichroic cube as a color composition unit.

On the other hand, for the purpose of improving color reproducibility and luminance, a projection display apparatus using four or more colors of light has been proposed. For example, a projection display apparatus improves color reproducibility and brightness by using orange, yellow, or cyan in addition to three colors of red, green, and blue (for example, Patent Document 1). .
JP 2002-287247 A (Claim 1, Claim 4, FIG. 1, etc.)

  Here, when the projection display apparatus has four or more colors of light, it is not possible to combine four or more colors of light with one color composition unit (cross dichroic cube). Therefore, the projection display apparatus needs to have a plurality of color composition units (dichroic cubes or cross dichroic cubes).

  For example, when four colors of light are required to be combined, the projection display apparatus obtains two combined lights obtained by combining the two colors of light, and further combines the two combined lights. Four colors of combined light are acquired. Note that the projection display apparatus may acquire combined light of three colors by acquiring combined light of three colors and combining the combined light and one color of light. The projection display apparatus may acquire four colors of combined light by acquiring combined light in which two colors of light are combined and combining the combined light and the two colors of light.

  Here, the optical path length from each light modulation element corresponding to four or more colors of light to the projection lens needs to be the same. In addition, it is necessary to provide a plurality of color composition units (dichroic cubes or cross dichroic cubes) between the light modulation element and the projection lens. Accordingly, the back focus of the projection lens becomes long.

  As a result, since the projection lens used in the projection display apparatus using three colors of light cannot be diverted, the cost of the projection display apparatus increases as a whole.

  Therefore, the present invention has been made to solve the above-described problem, and even when using four or more colors of light, it is possible to suppress an increase in the cost of the entire apparatus. An object is to provide a display device.

  One feature of the present invention is that a first color composition unit (dichroic cube 40A) for synthesizing two or more color component lights among four or more color component lights, and the four or more color component lights. A second color synthesis unit (dichroic cube 40B) that synthesizes color component light of two or more colors, a first projection unit (projection lens unit 110A) that projects the light synthesized by the first color synthesis unit, and The projection-type image display device includes a second projection unit (projection lens unit 110B) that projects the light synthesized by the second color synthesis unit, and the first projection unit and the second projection unit include the first color. The light synthesized by the synthesizing unit and the light synthesized by the second color synthesizing unit are emitted in the same direction, and the wavelength band of one color component light included in the four or more color component lights has the four colors Other color components included in the light A color component that is adjacent to one of the component light wavelength bands, and one of the first color composition unit and the second color composition unit is not adjacent to the wavelength component light of the four or more color component lights. The gist is to synthesize light.

  The term “adjacent wavelength band” means that for a color component light subject to color synthesis in a projection display apparatus, the wavelength band of one color component light is adjacent to the wavelength band of any other color component light. It is that you are. For example, red component light R and green component light G are objects of color synthesis, and color component light having a wavelength band between the wavelength band of red component light R and the wavelength band of green component light G is color synthesized. If not, the wavelength band of the red component light R and the wavelength band of the green component light G are adjacent.

  According to this feature, the first projection unit projects the light synthesized by the first color synthesis unit, and the second projection unit projects the light synthesized by the second color synthesis unit. Therefore, even when four or more colors of light are used, the color component light synthesized by the first color synthesis unit and the second color synthesis unit can be three colors or less. Therefore, it is not necessary to change the design of the projection lens, and the cost of the entire apparatus can be suppressed.

  In addition, since the first color composition unit or the second color composition unit synthesizes color component lights of two or more colors that are not adjacent to each other among the color component lights of four or more colors, the color component lights that are adjacent in the wavelength bands Compared with the case of combining the color component light, it is possible to increase the synthesis efficiency of the color component light.

  One feature of the present invention is that, in the above-described feature of the present invention, both the first color composition unit and the second color composition unit are colors whose wavelength bands are not adjacent to each other among the four or more color component lights. The gist is to synthesize component light.

  One feature of the present invention is that in the above-described feature of the present invention, a light source (such as the light source 10) that emits the color component light of four or more colors and two or more color components synthesized by the first color synthesis unit. Projection-type image display of a color separation unit (cross dichroic cube 21 and cross dichroic mirror 22) that separates light emitted from the light source into light and two or more color component lights synthesized by the second color synthesis unit The apparatus further includes an arrangement position of the first color synthesis unit and the first projection unit, and an arrangement position of the second color synthesis unit and the second projection unit that are symmetrical with respect to the color separation unit. The gist is to have a relationship.

  One feature of the present invention is the above-described feature of the present invention, provided in correspondence with the color component light of the four or more colors, and modulated by modulating the color component light of the four or more colors, respectively. Projection-type image display of four or more light modulation elements (liquid crystal panel 30R, liquid crystal panel 30G, liquid crystal panel 30B, liquid crystal panel 30Ye, etc.) that emit color component light to the first color synthesizing unit or the second color synthesizing unit The gist of the invention is that the apparatus further includes an optical path length from the color separation unit (cross dichroic cube 21) where the light emitted from the light source first enters to the four or more light modulation elements is equal.

  One feature of the present invention is that a light source (such as the light source 10) that emits four or more color component lights and a first color composition that synthesizes two or more color component lights of the four or more color component lights. Unit (dichroic cube 43A), a second color synthesis unit (dichroic cube 43B) for synthesizing two or more color component lights among the four or more color component lights, and the first color synthesis unit. The first projection means (projection lens unit 110A) for projecting the reflected light, the second projection means (projection lens unit 110B) for projecting the light synthesized by the second color synthesis section, and the first color synthesis section. A color separation unit (cross dichroic mirror 28) that separates light emitted from the light source into two or more color component lights to be synthesized and two or more color component lights to be synthesized by the second color synthesis unit; Projection-type image display device The first projection unit and the second projection unit emit light synthesized by the first color synthesis unit and light synthesized by the second color synthesis unit in the same direction, and the first color synthesis unit and The gist of the invention is that the arrangement position of the first projection means and the arrangement positions of the second color synthesis section and the second projection means have a symmetrical relationship with respect to the color separation section.

  According to the present invention, it is possible to provide a projection display apparatus that can suppress an increase in cost of the entire apparatus even when four or more colors of light are used.

  Hereinafter, a projection display apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[First Embodiment]
(Outline of projection display device)
Hereinafter, an outline of the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing an outline of a projection display apparatus 100 according to the first embodiment.

  As shown in FIG. 1, the projection display apparatus 100 includes a projection lens 110 and projects the image light magnified by the projection lens 110 onto a screen 200. As will be described later, the projection display apparatus 100 uses yellow component light Ye in addition to red component light R, green component light G, and blue component light B.

(Wavelength band of each color component light)
In the following, the wavelength band of each color component light to be modulated and combined in the first embodiment will be described with reference to the drawings. FIG. 2 is a diagram illustrating wavelength bands of each color component light according to the first embodiment.

As shown in FIG. 2, the red component light R, the green component light G, the blue component light B, and the yellow component light Ye are lights each having the illustrated wavelength band. The wavelength band of one color component light is adjacent to any of the wavelength bands of other color component light. Specifically, the wavelength band of the blue component light B, adjacent to the wavelength band of green component light G across the boundary A _1. The wavelength band of the green component light G is adjacent to the wavelength bands of the blue component light B and the yellow component light Ye across the boundary A ₁ and the boundary B ₁ . The wavelength band of the yellow component light Ye is adjacent to the wavelength band of the green component light G and the red component light R across the boundary B ₁ and the boundary C ₁ . The wavelength band of red component light R, adjacent to the wavelength band of yellow component light Ye across boundaries C _1.

Further, the blue component light B and the green component light G, having a wavelength band overlap each other in the vicinity of the boundary A _1. The green component light G and yellow component light Ye, having a wavelength band overlap each other in the vicinity of the boundary B _1. Huang A component light Ye and the red component light R, has a wavelength band overlap each other in the vicinity of the boundary C _1.

For example, the wavelength band of green component light G, and the yellow component light Ye is overlap each other in the wavelength band X ₁ and wavelength band Y _1. Here, to reflect light having a shorter wavelength than the boundary B _1, consider the case of synthesizing the green component light G and yellow component light Ye by a dichroic cube that transmits light of a wavelength longer than the boundary B _1. Waveband X ₁ contained in the yellow component light Ye is reflected by the dichroic cube, a wavelength band Y ₁ contained in the green component light G is transmitted through the dichroic cube. Thus, since the wavelength band Y ₁ included in the wavelength band X ₁ and the green component light G contained in the yellow component light Ye is not effectively used, the synthesis efficiency of light is degraded.

(Schematic configuration of lighting unit)
Hereinafter, a schematic configuration of the illumination unit according to the first embodiment will be described with reference to the drawings. FIG. 3 is a diagram illustrating a schematic configuration of the illumination unit 120 according to the first embodiment. In FIG. 3, it should be noted that a fly-eye lens that homogenizes the light emitted from the light source 10, a PBS (Polarized Beam Splitter) that aligns the polarization direction of the light emitted from the light source 10, and the like are omitted.

  As shown in FIG. 3, the illumination unit 120 includes a light source 10, a cross dichroic cube 21, a cross dichroic mirror 22, and a plurality of liquid crystal panels 30 (a liquid crystal panel 30R, a liquid crystal panel 30G, a liquid crystal panel 30B, and a liquid crystal panel 30Ye). And a pair of color synthesis units (dichroic cube 40A and dichroic cube 40B) and a pair of projection lenses (projection lens unit 110A and projection lens unit 110B).

  The light source 10 is a UHP lamp that emits white light. That is, the light emitted from the light source 10 includes at least red component light R, green component light G, blue component light B, and yellow component light Ye.

The cross dichroic cube 21, and blue component light B and the mirror surface 21A that transmits other light is reflected (color component light having a shorter wavelength than the boundary A _1), a longer wavelength than the red component light R (border C ₁ And a mirror surface 21B that transmits other light. The cross dichroic mirror 22 has a mirror surface 22A that reflects yellow component light Ye and a mirror surface 22B that reflects green component light G.

  Here, the cross dichroic cube 21 and the cross dichroic mirror 22 constitute a color separation unit that separates light emitted from the light source 10 into red component light R, green component light G, blue component light B, and yellow component light Ye.

  The liquid crystal panel 30R modulates the red component light R. Similarly, the liquid crystal panel 30G modulates the green component light G, the liquid crystal panel 30B modulates the blue component light B, and the liquid crystal panel 30Ye modulates the yellow component light Ye. Each liquid crystal panel 30 is arranged so that the optical path lengths from the cross dichroic cube 21 to each liquid crystal panel 30 are all equal.

  The dichroic cube 40A combines the blue component light B emitted from the liquid crystal panel 30B and the yellow component light Ye emitted from the liquid crystal panel 30Ye. The dichroic cube 40A emits the combined light to the projection lens unit 110A side. Here, as shown in FIG. 2, the blue component light B and the yellow component light Ye are color component lights whose wavelength bands are not adjacent to each other. That is, the wavelength band of the blue component light B and the wavelength band of the yellow component light Ye do not overlap.

  The dichroic cube 40B combines the red component light R emitted from the liquid crystal panel 30R and the green component light G emitted from the liquid crystal panel 30G. The dichroic cube 40B emits the combined light to the projection lens unit 110B side. Here, as shown in FIG. 2, the red component light R and the green component light G are color component lights whose wavelength bands are not adjacent to each other. That is, the wavelength band of the red component light R and the wavelength band of the green component light G do not overlap.

  The projection lens unit 110A projects the light synthesized by the dichroic cube 40A onto the screen 200. The projection lens unit 110B projects the light combined by the dichroic cube 40B onto the screen 200. The projection lens unit 110A and the projection lens unit 110B are disposed along the left-right direction of the illumination unit 120, and emit light in the same direction (above the illumination unit 120).

  Here, the arrangement positions of the projection lens unit 110A and the dichroic cube 40A and the arrangement positions of the projection lens unit 110B and the dichroic cube 40B are symmetrical with respect to the color separation unit (cross dichroic cube 21 and cross dichroic mirror 22). Have a relationship. Specifically, the projection lens unit 110A and the dichroic cube 40A and the projection lens unit 110B and the dichroic cube 40B are arranged symmetrically with respect to the color separation unit (cross dichroic cube 21 and cross dichroic mirror 22).

  The illumination unit 120 includes a plurality of mirrors (mirror 51 and mirror 52) and a plurality of lenses (lenses 61 to 64).

  The mirror 51 reflects the blue component light B reflected by the mirror surface 21A of the cross dichroic cube 21 to the dichroic cube 40A side. The mirror 52 reflects the red component light R reflected by the mirror surface 21B of the cross dichroic cube 21 to the dichroic cube 40B side.

  The lens 61 condenses the blue component light B reflected by the mirror 51 so that the light emitted from the liquid crystal panel 30B is irradiated to the projection lens unit 110A. The lens 62 condenses the yellow component light Ye reflected by the mirror surface 22A of the cross dichroic mirror 22 so that the light emitted from the liquid crystal panel 30Ye is irradiated onto the projection lens unit 110A.

  The lens 63 condenses the red component light R reflected by the mirror 52 so that the light emitted from the liquid crystal panel 30R is irradiated onto the projection lens unit 110B. The lens 64 condenses the green component light G reflected by the mirror surface 22B of the cross dichroic mirror 22 so that the light emitted from the liquid crystal panel 30G is irradiated onto the projection lens unit 110B.

(Function and effect)
According to the projection display apparatus 100 according to the first embodiment, the projection lens unit 110A projects the light synthesized by the dichroic cube 40A, and the projection lens unit 110B projects the light synthesized by the dichroic cube 40B. To do. Therefore, even when four or more colors of light are used, the color component light synthesized by the dichroic cube 40A and the dichroic cube 40B can be three colors or less. In other words, there is only one color composition unit (dichroic cube) arranged between the liquid crystal panel and the projection lens, and it is not necessary to take a long back focus. An increase in cost can be suppressed.

  According to the projection display apparatus 100 according to the first embodiment, the dichroic cube 40A combines two color component lights (blue component light B and yellow component light Ye) whose wavelength bands are not adjacent to each other, and the dichroic cube 40B. However, the two color component lights (red component light R and green component light G) whose wavelength bands are not adjacent to each other are synthesized. Accordingly, it is possible to increase the color component light combining efficiency compared to the case of combining color component lights having adjacent wavelength bands. Further, since the optical accuracy required for the dichroic cube 40A and the dichroic cube 40B is low at the boundary between the reflection wavelength of the color component light and the transmission wavelength of the color component light, the purpose of color synthesis is sufficiently achieved. The cost of the cube 40A and the dichroic cube 40B can be reduced.

  According to the projection display apparatus 100 according to the first embodiment, the projection lens unit 110A and the dichroic cube 40A, and the projection lens unit 110B and the dichroic cube 40B are separated into color separation units (cross dichroic cube 21 and cross dichroic mirror 22). ) Between the left and right sides. Accordingly, it is possible to suppress an increase in the size of the projection display apparatus 100 and arrange the optical components in a balanced manner.

  According to the projection display apparatus 100 according to the first embodiment, since the optical path lengths from the cross dichroic cube 21 to the liquid crystal panels 30 are all equal, it is necessary to change the optical design according to the optical path of each color component light. The cost of the entire apparatus can be reduced.

[Second Embodiment]
The second embodiment will be described below with reference to the drawings. In the following, differences between the above-described first embodiment and the second embodiment will be mainly described.

Specifically, in the first embodiment described above, the projection display apparatus 100 uses red component light R, green component light G, blue component light B, and yellow component light Ye. On the other hand, in the second embodiment, the projection display apparatus 100 uses red component light R, green component light G, blue component light B ₁ , blue component light B ₂ and yellow component light Ye. That is, the projection display apparatus 100 uses two types of blue component light B (blue component light B ₁ and blue component light B ₂ ).

  In the first embodiment described above, the light source 10 that is a white light source such as a UHP lamp is used. On the other hand, in 2nd Embodiment, solid light sources, such as LED (Light Emitting Diode) and LD (Laser Diode), are used.

(Wavelength band of each color component light)
In the following, the wavelength band of each color component light to be modulated and combined in the second embodiment will be described with reference to the drawings. FIG. 4 is a diagram illustrating wavelength bands of each color component light according to the second embodiment.

As shown in FIG. 4, the red component light R, the green component light G, the blue component light B ₁ , the blue component light B _2, and the yellow component light Ye are each light having a predetermined wavelength band.

Similar to the first embodiment described above, the wavelength band of one color component light is adjacent to one of the wavelength bands of other color component light. Specifically, the wavelength band of the blue component light B ₁ represents, adjacent to the wavelength band of the blue component light B _2. The wavelength band of the blue component light B ₂ is adjacent to the wavelength bands of the blue component light B ₁ and the green component light G. Waveband of green component light G is adjacent to the wavelength band of the blue component light B ₂ and the yellow component light Ye. The wavelength band of the yellow component light Ye is adjacent to the wavelength band of the green component light G and the red component light R. The wavelength band of the red component light R is adjacent to the wavelength band of the yellow component light Ye.

(Schematic configuration of lighting unit)
Hereinafter, a schematic configuration of the illumination unit according to the second embodiment will be described with reference to the drawings. FIG. 5 is a diagram illustrating a schematic configuration of the illumination unit 120 according to the second embodiment. In FIG. 5, it should be noted that the same components as those in FIG.

As shown in FIG. 5, the lighting unit 120 includes a plurality of individual light sources (light source 10R, the light source 10G, the light source 10B _1, the light source 10B ₂ and the light source 10Ye) and a plurality of liquid crystal panels 30 (liquid crystal panels 30R, liquid crystal panel 30G, Liquid crystal panel 30B ₁ , liquid crystal panel 30B ₂ and liquid crystal panel 30Ye).

The light source 10R is an individual light source such as an LED or an LD that emits red component light R. Similarly, the light source 10G, the light source 10B _1, the light source 10B ₂ and the light source 10Ye is green component light G, and blue component light _{B 1,} blue component light _{B 2} and yellow component light Ye in individuals light source such as an LED or LD for emitting respectively is there.

The liquid crystal panel 30R modulates the red component light R. Similarly, the liquid crystal panel 30G, the liquid crystal panel 30B ₁ , the liquid crystal panel 30B ₂ and the liquid crystal panel 30Ye modulate the green component light G, the blue component light B ₁ , the blue component light B ₂ and the yellow component light Ye, respectively.

  The illumination unit 120 includes a pair of color composition units (cross dichroic cube 41A and dichroic cube 41B) and a pair of projection lenses (projection lens unit 110A and projection lens unit 110B).

Cross dichroic cube 41A combines the red component light R emitted from the green component light G and the liquid crystal panel 30R emitted from been blue component light B ₁ and the liquid crystal panel 30G emitted from the liquid crystal panel 30B _1. The cross dichroic cube 41A emits the combined light to the projection lens unit 110A side. Here, as shown in FIG. 4, the blue component light B ₁ , the green component light G, and the red component light R are color component lights whose wavelength bands are not adjacent to each other. That is, the wavelength band of the blue component light B _1, waveband and the red component light R, green component light G do not overlap any.

Dichroic cube 41B combines the blue component light _{B 2} emitted and yellow component light Ye emitted from the liquid crystal panel 30Ye from the liquid crystal panel 30B _2. The dichroic cube 41B emits the combined light to the projection lens unit 110B side. Here, the blue component light B ₂ and the yellow component light Ye, as shown in FIG. 4, a color component light wavelength band are not adjacent. That does not overlap with the wavelength band of the blue component light B ₂ in the wavelength band and the yellow component light Ye.

The illumination unit 120 includes a plurality of lenses (lenses 161 to 170). Lens 161 and lens 162 illuminates the blue component light _{B 1} of the light source 10B ₁ emitted to the liquid crystal panel 30B _1. The lens 163 and the lens 164 irradiate the liquid crystal panel 30G with the green component light G emitted from the light source 10G. The lens 165 and the lens 166 irradiate the liquid crystal panel 30R with the red component light R emitted from the light source 10R.

The lens 167 and the lens 168 irradiate the liquid crystal panel 30Ye with yellow component light Ye emitted from the light source 10Ye. Lens 169 and lens 170 illuminates the blue component light _{B 2} to the light source 10B ₂ emitted to the liquid crystal panel 30B _2.

[Third Embodiment]
Hereinafter, a third embodiment will be described with reference to the drawings. In the following, differences between the first embodiment and the third embodiment described above will be mainly described.

Specifically, in the first embodiment described above, the projection display apparatus 100 uses red component light R, green component light G, blue component light B, and yellow component light Ye. On the other hand, in the third embodiment, the projection display apparatus 100 includes a red component light R, a green component light G ₁ , a green component light G ₂ , a blue component light B ₁ , a blue component light B ₂ and a yellow component. Light Ye is used. That is, the projection display apparatus 100 includes two types of green component light G (green component light G ₁ and green component light G ₂ ) and two types of blue component light B (blue component light B ₁ and blue component light B). ₂ ).

In the first embodiment described above, the light source 10 that is a white light source such as a UHP lamp is used. In contrast, in the third embodiment, in addition to the light source 10, an individual light source is used which emits an individual light source and the blue component light B ₂ emits green component light G _1.

(Wavelength band of each color component light)
In the following, the wavelength band of each color component light to be modulated and combined in the third embodiment will be described with reference to the drawings. FIG. 6 is a diagram illustrating the wavelength bands of the respective color component lights according to the third embodiment.

As shown in FIG. 6, the red component light R, the green component light G ₁ , the green component light G ₂ , the blue component light B ₁ , the blue component light B _2, and the yellow component light Ye each have a predetermined wavelength band. Light.

Similar to the first embodiment described above, the wavelength band of one color component light is adjacent to one of the wavelength bands of other color component light. Specifically, the wavelength band of the blue component light B ₁ represents, adjacent to the wavelength band of the blue component light B _2. The wavelength band of the blue component light B ₂ is adjacent to the wavelength band of the blue component light B ₁ and the green component light G _1. Waveband of green component light G ₁ is adjacent to the wavelength band of the blue component light B ₂ and the green component light G _2. Waveband of green component light G ₂ is, adjacent to the wavelength band of the blue component light B ₂ and the yellow component light Ye. Waveband of yellow component light Ye is adjacent to the wavelength band of green component light G ₂ and the red component light R. The wavelength band of the red component light R is adjacent to the wavelength band of the yellow component light Ye.

Here, the blue component light B ₁ , the green component light G ₂ , the yellow component light Ye and the red component light R are included in the light emitted from the light source 10, and the blue component light B ₂ and the green component light G ₁ are Light emitted from the light source.

(Schematic configuration of lighting unit)
Hereinafter, a schematic configuration of the illumination unit according to the third embodiment will be described with reference to the drawings. FIG. 7 is a diagram illustrating a schematic configuration of the illumination unit 120 according to the third embodiment. In FIG. 7, it should be noted that the same components as those in FIG.

As shown in FIG. 7, the illumination unit 120 includes a light source 10, a plurality of individual light sources (light source 10B ₂ and light source 10G ₁ ), and a plurality of liquid crystal panels 30 (liquid crystal panel 30R, liquid crystal panel 30G ₁ , liquid crystal panel 30G _2). , Liquid crystal panel 30B ₁ , liquid crystal panel 30B ₂ and liquid crystal panel 30Ye).

The light source 10 is a white light source such as UHP that emits light including blue component light B ₁ , green component light G ₂ , yellow component light Ye, and red component light R.

Light source 10G ₁ is an individual light source such as LED or LD which emits green component light _{G 1.} Similarly, the light source 10B ₂ is an individual light source such as LED or LD which emits blue component light _{B 2.}

The liquid crystal panel 30R modulates the red component light R. Similarly, the liquid crystal panel 30G ₁ , the liquid crystal panel 30G ₂ , the liquid crystal panel 30B ₁ , the liquid crystal panel 30B ₂ and the liquid crystal panel 30Ye have a green component light G ₁ , a green component light G ₂ , a blue component light B ₁ , and a blue component light B. ₂ and yellow component light Ye are respectively modulated.

  The illumination unit 120 includes a cross dichroic cube 25 and a cross dichroic mirror 26.

The cross dichroic cube 25 has a mirror surface 25A that transmits other light and reflects the blue component light B _1, and a mirror surface 25B that transmits other light to reflect the red component light R. The cross dichroic mirror 26 includes a mirror surface 26B that reflects the mirror surface 26A and the green component light G ₂ that reflects yellow component light Ye.

Here, the cross dichroic cube 25 and the cross dichroic mirror 26, constitutes a color separation unit for separating the light emitted from the light source 10 into red component light R and green component light G ₂ and blue component light B ₁ and yellow component light Ye To do.

  The illumination unit 120 includes a pair of color composition units (cross dichroic cube 42A and cross dichroic cube 42B) and a pair of projection lenses (projection lens unit 110A and projection lens unit 110B).

Cross dichroic cube 42A combines the yellow component light Ye emitted from the emitted blue component light _{B 1} and the liquid crystal panel 30Ye green component light _{G 1} and the liquid crystal panel 30B ₁ emitted from the liquid crystal panel 30G _1. The cross dichroic cube 42A emits the combined light to the projection lens unit 110A side. Here, the blue component light B ₁ , the green component light G _1, and the yellow component light Ye are color component lights whose wavelength bands are not adjacent to each other as shown in FIG. That is, the wavelength band of the blue component light B _1, waveband and the yellow component light Ye of the green component light G ₁ does not overlap either.

Cross dichroic cube 42B combines the blue component light B ₂ emitted from the red component light R and the liquid crystal panel 30B ₂ emitted from the green component light G ₂ and the liquid crystal panel 30R emitted from the liquid crystal panel 30G _2. The cross dichroic cube 42B emits the combined light to the projection lens unit 110B side. Here, as shown in FIG. 6, the blue component light B ₂ , the green component light G _2, and the red component light R are color component lights whose wavelength bands are not adjacent to each other. That is, the wavelength band of the blue component light B _2, waveband and the red component light R, green component light G ₂ are not overlapping any.

  Here, the arrangement position of the projection lens unit 110A and the cross dichroic cube 42A and the arrangement position of the projection lens unit 110B and the cross dichroic cube 42B are symmetrical with respect to the color separation unit (cross dichroic cube 25 and cross dichroic mirror 26). Have the same relationship. Specifically, the projection lens unit 110A and the cross dichroic cube 42A, and the projection lens unit 110B and the cross dichroic cube 42B are arranged symmetrically with respect to the color separation unit (cross dichroic cube 25 and cross dichroic mirror 26). The

The illumination unit 120 has a plurality of mirrors (mirrors 51 to 54). Mirror 51 reflects the cross dichroic cube blue component light B ₁ reflected by the mirror surface 25A of 25 the cross dichroic cube 42A side. The mirror 52 reflects the red component light R reflected by the mirror surface 25B of the cross dichroic cube 25 to the cross dichroic cube 42B side. Mirror 53 reflects the green component light G1 of the light source 10G ₁ emitted to the cross dichroic cube 42A side. Mirror 54 reflects the blue component light _{B 2} to the light source 10B ₂ emitted to the cross dichroic cube 42B side.

[Fourth Embodiment]
Hereinafter, a fourth embodiment will be described with reference to the drawings. In the following, differences between the first embodiment and the fourth embodiment described above will be mainly described.

  Specifically, in the first embodiment described above, the first color synthesis unit (dichroic cube 40A) and the second color synthesis unit (dichroic cube 40B) synthesize color component lights whose wavelength bands are not adjacent to each other. On the other hand, in the fourth embodiment, the first color synthesis unit and the second color synthesis unit synthesize color component lights having adjacent wavelength bands. Note that the color component light used by the projection display apparatus 100 according to the fourth embodiment is the same as in the first embodiment described above.

(Schematic configuration of lighting unit)
Hereinafter, a schematic configuration of the illumination unit according to the fourth embodiment will be described with reference to the drawings. FIG. 8 is a diagram illustrating a schematic configuration of the illumination unit 120 according to the fourth embodiment. In FIG. 8, it should be noted that the same components as those in FIG.

  As shown in FIG. 8, the illumination unit 120 includes a cross dichroic mirror 28, a pair of color synthesis units (dichroic cube 43A and dichroic cube 43B), and a pair of projection lenses (projection lens unit 110A and projection lens unit 110B). Have

  The cross dichroic mirror 28 has a mirror surface 28A that reflects blue component light B and green component light G, and a mirror surface 28B that reflects red component light R and yellow component light Ye.

  The dichroic cube 43A combines the blue component light B emitted from the liquid crystal panel 30B and the green component light G emitted from the liquid crystal panel 30G. The dichroic cube 43A emits the combined light to the projection lens unit 110A side. Here, the blue component light B and the green component light G are color component lights having adjacent wavelength bands, as shown in FIG.

  The dichroic cube 43B combines the red component light R emitted from the liquid crystal panel 30R and the yellow component light Ye emitted from the liquid crystal panel 30Ye. The dichroic cube 43B emits the combined light to the projection lens unit 110B side. Here, as shown in FIG. 2, the red component light R and the yellow component light Ye are color component lights having adjacent wavelength bands.

  The illumination unit 120 has a plurality of mirrors (mirrors 151 to 156). The mirror 151 is a dichroic cube that reflects the green component light G toward the liquid crystal panel 30G and transmits the blue component light B. The mirror 152 and the mirror 153 are mirrors that reflect the blue component light B transmitted through the mirror 151 toward the liquid crystal panel 30B. The mirror 154 is a dichroic cube that reflects the red component light R toward the liquid crystal panel 30R and transmits the yellow component light Ye. The mirror 155 and the mirror 156 are mirrors that reflect the yellow component light Ye transmitted through the mirror 154 toward the liquid crystal panel 30Ye.

  Here, the cross dichroic mirror 28, the mirror 151, and the mirror 154 constitute a color separation unit that separates light emitted from the light source 10 into red component light R, green component light G, blue component light B, and yellow component light Ye. .

  The projection lens unit 110A and the projection lens unit 110B are arranged along the left-right direction of the illumination unit 120, and emit light in the same direction, as in the fourth embodiment described above.

  Here, the arrangement positions of the projection lens unit 110A and the dichroic cube 43A and the arrangement positions of the projection lens unit 110B and the dichroic cube 43B have a symmetrical relationship with respect to the color separation unit (cross dichroic mirror 28). Specifically, the projection lens unit 110A and the dichroic cube 43A, and the projection lens unit 110B and the dichroic cube 43B are arranged symmetrically with respect to the color separation unit (cross dichroic mirror 28).

  Thus, in the fourth embodiment, the cross dichroic mirror 28 separates the light emitted from the light source 10 into two systems including the color component light having adjacent wavelength bands without transmitting the light emitted from the light source 10. Therefore, it is not necessary to irradiate the dichroic cube 43A and the dichroic cube 43B with the light emitted from the light source 10 from the left and right inner sides of the dichroic cube 43A and the dichroic cube 43B. Accordingly, it is possible to adopt a configuration in which light emitted from the light source 10 is irradiated onto the dichroic cube 43A and the dichroic cube 43B from the outside in the left-right direction of the dichroic cube 43A and the dichroic cube 43B.

(Function and effect)
According to the fourth embodiment of the present invention, the projection lens unit 110A projects light synthesized by the dichroic cube 43A, and the projection lens unit 110B projects light synthesized by the dichroic cube 43B. Therefore, even when four or more colors of light are used, the color component light synthesized by the dichroic cube 43A and the dichroic cube 43B can be three colors or less. Therefore, it is not necessary to change the design of the projection lens, and the cost of the entire apparatus can be suppressed.

  According to the projection display apparatus 100 according to the fourth embodiment, the projection lens unit 110A and the dichroic cube 43A, and the projection lens unit 110B and the dichroic cube 43B are arranged on the left and right sides of the color separation unit (cross dichroic mirror 28). Arranged symmetrically. Accordingly, it is possible to suppress an increase in the size of the projection display apparatus 100 and arrange the optical components in a balanced manner.

  According to the projection display apparatus 100 according to the fourth embodiment, the cross dichroic mirror 28 does not transmit the light emitted from the light source 10, and the light source 10 emits two systems including color component lights having adjacent wavelength bands. Separate the light. Accordingly, it is possible to adopt a configuration in which light emitted from the light source 10 is irradiated to the dichroic cube 43A and the dichroic cube 43B from the left and right outer sides of the dichroic cube 43A and the dichroic cube 43B. As a result, the distance between the projection lens unit 110A and the projection lens unit 110B can be reduced, and even when a plurality of projection lenses are used, video light emitted from the plurality of projection lenses can be easily superimposed on the screen 200. .

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In the first embodiment described above, both the dichroic cube 40A and the dichroic cube 40B synthesize color component lights whose wavelength bands are not adjacent to each other, but the present invention is not limited to this. Specifically, any one of the dichroic cube 40A and the dichroic cube 40B may synthesize color component light whose wavelength bands are not adjacent. However, since the green component light G and the yellow component light Ye overlap each other in a wide wavelength band, it is preferable to synthesize the green component light G and the yellow component light Ye by separate color synthesis units.

  In the embodiment described above, a dichroic cube (or a cross dichroic cube) in which the reflection of the color component light and the transmission of the color component light are determined according to the wavelength band of the color component light is used as the color separation unit and the color synthesis unit. However, the present invention is not limited to this. Specifically, a PBS (Polarized Beam Splitter) film in which the reflection of the color component light and the transmission of the color component light are determined according to the polarization direction of the color component light may be used as the color separation unit and the color synthesis unit. .

  In the embodiment described above, a transmissive liquid crystal panel (liquid crystal panel 30) is used as the light modulation element, but the present invention is not limited to this. Specifically, a reflective liquid crystal panel (LCOS) may be used as the light modulation element.

1 is a diagram showing an outline of a projection display apparatus 100 according to a first embodiment. It is a figure which shows the wavelength range of the color component light which concerns on 1st Embodiment. It is a figure which shows schematic structure of the illumination unit 120 which concerns on 1st Embodiment. It is a figure which shows the wavelength range of the color component light which concerns on 2nd Embodiment. It is a figure which shows schematic structure of the illumination unit 120 which concerns on 2nd Embodiment. It is a figure which shows the wavelength range of the color component light which concerns on 3rd Embodiment. It is a figure which shows schematic structure of the illumination unit 120 which concerns on 3rd Embodiment. It is a figure which shows schematic structure of the illumination unit 120 which concerns on 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Light source, 21 ... Cross dichroic cube, 22 ... Cross dichroic mirror, 25 ... Cross dichroic cube, 26 ... Cross dichroic mirror, 28 ... Cross dichroic mirror, 30 ... Liquid crystal panel, 40A, 40B ... Dichroic cube, 41A, 41B ... Cross dichroic cube, 42A, 42B ... Cross dichroic cube, 43A, 43B ... Dichroic cube, 51-54 ... Mirror, 61 ˜64... Lens, 100... Projection type image display device, 110A and 110B... Projection lens unit, 120... Illumination unit, 151 to 156. 200 ... Screen

Claims (5)

A first color synthesis unit that synthesizes two or more color component lights of four or more color component lights;
A second color synthesis unit for synthesizing two or more color component lights among the four or more color component lights;
First projection means for projecting the light synthesized by the first color synthesis unit;
Second projecting means for projecting the light synthesized by the second color synthesizing unit,
The first projection unit and the second projection unit emit light synthesized by the first color synthesis unit and light synthesized by the second color synthesis unit in the same direction,
The wavelength band of one color component light included in the color component light of four or more colors is adjacent to any one of the wavelength bands of other color component light included in the color component light of four or more colors,
Either one of the first color synthesis unit and the second color synthesis unit synthesizes color component lights having wavelength bands that are not adjacent to each other among the color component lights of four or more colors. apparatus.   The first color composition unit and the second color composition unit both synthesize color component lights having wavelength bands that are not adjacent to each other among the four or more color component lights. Projection display device. A light source that emits light of four or more color components;
A color separation unit that separates light emitted from the light source into two or more color component lights synthesized by the first color synthesis unit and two or more color component lights synthesized by the second color synthesis unit; Further comprising
The arrangement positions of the first color synthesis unit and the first projection unit and the arrangement positions of the second color synthesis unit and the second projection unit have a symmetrical relationship with respect to the color separation unit. The projection display apparatus according to claim 1, wherein Provided corresponding to the color component light of four or more colors, respectively modulate the color component light of four or more colors, and use the modulated color component light as the first color synthesis unit or the second color synthesis It further comprises four or more light modulation elements that emit to the part side,
4. The projection display apparatus according to claim 3, wherein the optical path lengths from the color separation unit to the four or more light modulation elements are all equal. A light source that emits four or more color component lights;
A first color synthesis unit that synthesizes two or more color component lights of the four or more color component lights;
A second color synthesis unit that synthesizes two or more color component lights of the four or more color component lights;
First projection means for projecting light synthesized by the first color synthesis unit;
Second projection means for projecting the light synthesized by the second color synthesis unit;
A color separation unit that separates light emitted from the light source into two or more color component lights synthesized by the first color synthesis unit and two or more color component lights synthesized by the second color synthesis unit; With
The first projection unit and the second projection unit emit the light synthesized by the first color synthesis unit and the light synthesized by the second color synthesis unit in the same direction,
The arrangement positions of the first color synthesis unit and the first projection unit and the arrangement positions of the second color synthesis unit and the second projection unit have a symmetrical relationship with respect to the color separation unit. A projection-type image display device.

Images