JP2020106692A - projector - Google Patents

Abstract

To provide a projector that can reduce bleeding occurring in image light.SOLUTION: A projector comprises: a light source unit that emits light including at least first color light and second color light; a first multi-lens array on which the light is incident; a superimposition lens that is provided on a subsequent stage of the first multi-lens array and makes the first color light and the second color light incident at positions different from each other; a light blocking member that is provided between a light emission side of the first multi-lens array and the superimposition lens and blocks part of the light; a light modulation device that includes a plurality of pixels consisting of sub-pixels; a micro-lens array that includes a plurality of micro-lenses corresponding one-to-one to the plurality of pixels; and a projection optical device that projects light emitted from the light modulation device.SELECTED DRAWING: Figure 2

Description

The present invention relates to a projector.

The projector modulates light emitted from a light source by a light modulator according to image information and magnifies and projects the obtained image by a projection lens. As such a projector, there is known a projector that generates a desired image by separating white light emitted from an illumination device into RGB colors and modulating the same with one liquid crystal panel (for example, refer to Patent Document 1 below). .. In this projector, the illumination light emitted from the illumination device is shaped by being expanded or compressed and then made incident on the liquid crystal panel.

JP-A-11-109285

However, in the above-mentioned related art, there is a problem that the illumination light may not be sufficiently shaped, and the illumination light is mixed in each pixel of the liquid crystal panel, so that the image light has a blur.

According to the first aspect of the present invention, a light source unit that emits light including at least a first color light and a second color light, a first multi-lens on which the light is incident, and a rear stage of the first multi-lens are provided, A superimposing lens that allows the first color light and the second color light to enter at different positions, and a light blocking member that is provided between the light exit side of the first multi-lens and the superimposing lens and blocks a part of the light. A light modulation device including a plurality of pixels including a plurality of sub-pixels, a microlens array including a plurality of microlenses corresponding to each of the plurality of pixels in a one-to-one correspondence, and light emitted from the light modulation device. A projection optical device for projecting is provided.

In the first aspect, it is preferable that a polarization conversion element provided between the light exit side of the first multi-lens and the superimposing lens is further provided.

In the first aspect, it is preferable that the first multi-lens array further includes a second multi-lens array having a plurality of lenses arranged corresponding to the respective lenses of the first multi-lens.

In the first aspect, the planar shape of the light shielding member is preferably the same as the planar shape of a partition member that partitions the plurality of sub-pixels in one pixel of the plurality of pixels.

FIG. 1 is a plan view showing a schematic configuration of a projector according to a first embodiment. It is a top view of an illuminating device. It is a side view of an illuminating device. It is a perspective view which shows the state of the light-incidence surface in a superposition lens. It is a top view which shows the pixel structure of a light modulator. It is a figure which shows the cross section in a 1st sub pixel and a 2nd sub pixel. It is a figure which shows the cross section in a 3rd sub pixel and a 4th sub pixel. It is a figure which shows the relationship between a minute light beam and each sub-pixel when a light-shielding member is not provided. It is a figure which shows the relationship between a minute light beam and each sub pixel in the case of providing a light shielding member. It is a top view which shows schematic structure of a light-shielding member.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Note that, in the drawings used in the following description, in order to make the features easy to understand, there may be a case where the featured portions are enlarged for convenience, and the dimensional ratios of the respective constituent elements are not necessarily the same as the actual ones. Absent.

(First embodiment)
The projector according to the present embodiment is a projection type image display device that displays a color image on a screen. The projector according to the present embodiment uses a laser light source such as a semiconductor laser that can obtain high-luminance and high-power light as a light source of an illumination device.

FIG. 1 is a plan view showing a schematic configuration of a projector according to this embodiment.
As shown in FIG. 1, the projector 1 includes an illumination device 100, a light modulation device 200, and a projection optical device 300. In the projector 1, the illumination optical axis of the illumination light emitted from the illumination device 100 is the optical axis AX. In the following description, an XYZ orthogonal coordinate system will be used as needed. The Z direction corresponds to the vertical direction of the projector, the X direction corresponds to a direction parallel to the optical axis AX, and the Y direction corresponds to a direction orthogonal to the X direction and the Z direction.

The light modulator 200 is, for example, a single-plate type liquid crystal light modulator using one color liquid crystal display panel. By adopting such a single plate type liquid crystal light modulation device, the projector 1 can be downsized. Then, the light modulation device 200 modulates the illumination light from the illumination device 100 according to the image information to form image light.

A light incident side polarization plate 201a is provided on the surface side of the light modulation device 200 facing the illumination device 100. Further, a light emitting side polarization plate 201b is provided on the surface side of the light modulation device 200 facing the projection optical device 300. The polarization axes of the light incident side polarization plate 201a and the light emission side polarization plate 201b are orthogonal to each other.

The projection optical device 300 includes a projection lens and magnifies and projects the image light modulated by the light modulator 200 toward the screen SCR. Note that the number of lenses forming this projection optical device may be one or more.

(Lighting device)
Subsequently, a specific configuration of the lighting device 100 will be described.
FIG. 2 is a top view of the lighting device viewed from the +Z direction toward the −Z direction. FIG. 3 is a side view of the lighting device viewed from the −Y direction to the +Y direction.

As shown in FIGS. 2 and 3, the illuminating device 100 includes a light source unit 110, a lens integrator unit 70, a light blocking member 90, a polarization conversion element 73, and a superimposing lens 74.
The light source unit 110 includes a light source unit 10, a first condenser lens 11, a diffusion plate 12, a mirror 13, an excitation light source 30, a second condenser lens 31, a phosphor element 32, and a collimator optical system. 40, the light separation element 20, and a light separation mirror group 60.

In the light source unit 110, the light source unit 10, the first condenser lens 11, the diffusion plate 12, the collimator lens 14, and the mirror 13 are arranged in this order along the optical axis ax1 of the light source unit 10. Has been done. In the light source unit 110, the excitation light source 30, the second condensing lens 31, the phosphor element 32, the collimator optical system 40, the light separation element 20, along the optical axis ax2 of the excitation light source 30, The correction lens 50 and the light separation mirror group 60 are arranged side by side in this order. The optical axes ax1 and ax2 are separated from each other in the Z direction, and the optical axes ax1 and ax2 are orthogonal to each other when viewed in plan from the Z direction. The optical axis ax2 is parallel to the optical axis AX.

In the present embodiment, the light source unit 10 includes, for example, a light emitting diode that emits blue light flux (first color light) LB. In addition to the light emitting diode, a solid light emitting element such as a laser diode can be used for the light source unit 10. Further, as the light source unit 10, such solid light emitting elements may be used alone or in combination.

The first condensing lens 11 condenses the blue light beam LB emitted from the light source unit 10, and is composed of, for example, one convex lens. The number of lenses forming the first condenser lens 11 may be one or plural.

The diffuser plate 12 makes the illuminance distribution uniform by diffusing the blue light flux LB. The diffusion plate 12 is a known diffusion plate, for example, frosted glass, a holographic diffuser, a transparent substrate whose surface is subjected to blasting, a scattering material such as beads dispersed in the transparent substrate, and a scattering material. A material that scatters light can be used.

The collimator lens 14 collimates the blue light beam LB diffused by the diffusion plate 12 and makes it enter the mirror 13. The collimator lens 14 may be composed of a plurality of lenses.

The mirror 13 reflects the blue light beam LB diffused by the diffusion plate 12 in the +X direction along the optical axis ax2. The mirror 13 is arranged so as to form an angle of 45 degrees with respect to the optical axis ax1. The mirror 13 is arranged so as to overlap with a dichroic mirror 21 in a light separating element 20 described later in a plan view.

The excitation light source 30 is for exciting the phosphor element 32 to generate fluorescence. The excitation light source 30 is composed of, for example, a blue laser light emitting element that emits blue laser light having a wavelength band of 440 nm to 470 nm as the excitation light B. The excitation light source 30 may be composed of a plurality of blue laser light emitting elements according to the required output of the excitation light B.

The second condenser lens 31 condenses the excitation light B emitted from the excitation light source 30, and is composed of, for example, one convex lens. The number of lenses forming the second condenser lens 31 may be one or plural.

The phosphor element 32 includes a phosphor that is excited by absorbing the excitation light B. The phosphor excited by the excitation light B emits fluorescence (yellow fluorescence) YL having a wavelength band of 500 to 700 nm, for example. The phosphor element 32 emits the fluorescence YL from the side opposite to the incident side of the excitation light B. The fluorescence YL emitted from the phosphor element 32 enters the collimator optical system 40. Since the illumination device 100 of the present embodiment generates white light by using the fluorescence YL generated by exciting the phosphor element 32, it is possible to obtain high luminous efficiency.

The collimator optical system 40 picks up and collimates the fluorescence YL emitted from the phosphor element 32. The collimator optical system 40 of this embodiment is composed of, for example, a first convex lens 40a and a second convex lens 40b. The fluorescence YL collimated by the collimator optical system 40 enters the light separation element 20.

The light separating element 20 separates the fluorescent light YL into two lights having different colors. Specifically, the light separation element 20 is composed of a dichroic mirror 21 and a mirror 22. The dichroic mirror 21 separates the yellow fluorescence YL from the phosphor element 32 into a red light flux (second color light) LR and a green light flux LG. The dichroic mirror 21 transmits the red light flux LR and reflects the green light flux LG to separate the fluorescence YL into two.

The mirror 22 is arranged in the optical path of the green light flux LG, and reflects the green light flux LG reflected by the dichroic mirror 21 in the +X direction. The red light flux LR and the green light flux LG separated by the light separation element 20 travel in the +X direction.

The light splitting mirror group 60 is arranged on the optical path of the green light flux LG reflected by the mirror 22 of the light splitting element 20, and splits the green light flux LG into two. Specifically, the light separation mirror group 60 includes a half mirror 61 and a mirror 62. The half mirror 61 transmits a part of the green light flux LG as a first green light flux LG1 and reflects the remaining part of the green light flux LG as a second green light flux LG2 in the −Z direction. The first green light flux LG1 travels along the optical axis ax2 and enters the lens integrator unit 70.

The second green light flux LG2 is incident on the mirror 62. The mirror 62 reflects the second green light flux LG2 in the +X direction. The second green light flux LG2 reflected by the mirror 62 travels along the optical axis ax2 and enters the lens integrator unit 70.
As described above, the light separating mirror group 60 separates the green light flux LG into two to generate the first green light flux LG1 and the second green light flux LG2.

The light source unit 110 of the present embodiment emits the light beam LA including the blue light beam LB, the red light beam LR, the first green light beam LG1 and the second green light beam LG2 toward the lens integrator unit 70. The central axis of the light beam LA emitted from the light source unit 110 coincides with the optical axis AX. Further, the chief rays of the respective light fluxes LB, LR, LG1 and LG2 are located at the same distance from the central axis (optical axis AX) of the light flux LA.

The lens integrator unit 70 includes a first multi-lens array 71 and a second multi-lens array 72. The first multi-lens array 71 is configured by arranging a plurality of first small lenses 75 in a plane, for example. The first multi-lens array 71 splits the light flux LA emitted from the light source unit 110 into a plurality of small light fluxes by each first small lens 75 and focuses each of them.

The second multi-lens array 72 has, for example, a plurality of second small lenses 76 arranged in a plane corresponding to the respective first small lenses 75 of the first multi-lens array 71. In the present embodiment, the second multi-lens array 72 superimposes the image of each first small lens 75 of the first multi-lens array 71 on the optical modulator 200 together with the superimposing lens 74 to be described later.

In the present embodiment, the light blocking member 90 is provided between the light exit side of the first multi-lens array 71 and the superimposing lens 74. More specifically, the light blocking member 90 is provided between the light emitting surface 72a of the second multi-lens array 72 and the superimposing lens 74 and in the vicinity of the light emitting surface 72a. Here, the light exit surface 72 a of the second multi-lens array 72 corresponds to the light exit surface of the second small lens 76.

The light blocking member 90 shapes part of the light from the lens integrator unit 70 by blocking a part of the light from the lens integrator unit 70. Note that, in FIG. 2, the light shielding member 90 and the light emitting surface 72a are separated from each other for easy viewing of the drawing.

The light transmitted through the light blocking member 90 enters the polarization conversion element 73. In the present embodiment, the polarization conversion element 73 is arranged between the light exit side of the first multi-lens array 71 and the superimposing lens 74, more specifically, between the light exit side of the second multi-lens array 72 and the superimposing lens 74. It is provided in between.

The polarization conversion element 73 is configured by arranging a polarization separation film and a retardation plate (1/2 retardation plate) in an array. The polarization conversion element 73 converts the polarization direction of light that has passed through the lens integrator unit 70 and the light blocking member 90 into a predetermined direction. Thereby, the polarization direction of the light incident on the light modulation device 200 corresponds to the transmission axis direction of the light incidence side polarization plate 201a disposed on the light incidence side of the light modulation device 200. Therefore, the light-incident-side polarization plate 201a does not block the light incident on the light modulation device 200, and the light utilization efficiency is improved.

The superimposing lens 74 is composed of, for example, a convex lens, and is for superimposing the light that has passed through the light blocking member 90 and the polarization conversion element 73 on the light modulator 200.

In the present embodiment, the light fluxes LB, LR, LG1 and LG2 in the light flux LA do not overlap each other. Therefore, the light fluxes LB, LR, LG1, and LG2 are incident on different regions of the lens integrator unit 70, respectively. After passing through the lens integrator unit 70 and the polarization conversion element 73, the light beams LB, LR, LG1, and LG2 are incident on the superimposing lens 74 in a state where they do not intersect with each other.

Hereinafter, the light flux LA that has passed through the lens integrator unit 70 and the polarization conversion element 73 will be referred to as illumination light W. The illumination light W includes blue light WB, red light WR, first green light WG1 and second green light WG2. Here, the blue light WB corresponds to the blue light beam LB passing through the lens integrator unit 70 and the polarization conversion element 73, and the red light WR corresponds to the red light beam LR passing through the lens integrator unit 70 and the polarization conversion element 73. , The first green light WG1 corresponds to the first green light flux LG1 that has passed through the lens integrator unit 70 and the polarization conversion element 73, and the second green light WG2 has the first green light WG2 that passes through the lens integrator unit 70 and the polarization conversion element 73. It corresponds to two green light fluxes LG2.

FIG. 4 is a perspective view showing a state of the light incident surface of the superposing lens 74. In FIG. 4, the blue light WB, the red light WR, the first green light WG1 and the second green light WG2 are schematically shown.
Also in the illumination light W, the blue light WB, the red light WR, the first green light WG1 and the second green light WG2 are in a state where they do not overlap each other. Therefore, the blue light WB, the red light WR, the first green light WG1 and the second green light WG2 are incident on different positions of the superimposing lens 74 as shown in FIG. The principal rays of the blue light WB, the red light WR, the first green light WG1, and the second green light WG2 and the lens optical axis 74a of the superimposing lens 74 are all equal in distance. Hereinafter, the blue light WB, the red light WR, the first green light WG1 and the second green light WG2 may be collectively referred to as respective lights WB, WR, WG1, WG2 unless otherwise particularly distinguished.

In the present embodiment, the superimposing lens 74 changes the incident directions of the respective lights WB, WR, WG1, WG2 to the light modulation device 200 according to the incident positions of the respective light WB, WR, WG1, WG2 on the superimposing lens 74. Let That is, the superimposing lens 74 can make the respective lights WB, WR, WG1, and WG2 incident on the optical modulator 200 from four directions.

Next, the pixel structure of the light modulation device 200 will be described. FIG. 5 is a plan view showing a pixel structure of the light modulation device 200, and FIGS. 6 and 7 are cross-sectional views showing a main part of the pixel structure of the light modulation device 200.
As shown in FIGS. 5, 6 and 7, the light modulation device 200 has a plurality of pixels 201. Each pixel 201 includes a first subpixel 201B, a second subpixel 201R, a third subpixel 201G1, and a fourth subpixel 201G2. Hereinafter, the first sub-pixel 201B, the second sub-pixel 201R, the third sub-pixel 201G1 and the fourth sub-pixel 201G2 may be simply referred to as the sub-pixels 201B, 201R, 201G1 and 201G2.

As shown in FIG. 5, in the light modulation device 200 of the present embodiment, the plurality of pixels 201 are arranged in a matrix along the Y direction and the Z direction. In each pixel 201, the first sub-pixel 201B and the second sub-pixel 201R are arranged in this order in the −Z direction, and the fourth sub-pixel 201G2 is arranged in the +Y direction with respect to the first sub-pixel 201B. The third sub-pixel 201G1 is arranged side by side in the +Y direction with respect to the second sub-pixel 201R. Each of the sub-pixels 201B, 201R, 201G1 and 201G2 is divided into a lattice by a black matrix (lattice portion) BM.

In the present embodiment, the light exit surface 72a of the second multi-lens array 72 in which the light blocking member 90 is arranged and the pixel 201 are optically substantially conjugate. As a result, an illumination area having the same brightness distribution as the light exit surface 72a is formed on each pixel 201 of the light modulation device 200 that is optically conjugate. The term “optically substantially conjugate” is not limited to the case where the illumination area having the same luminance distribution as that of the light exit surface 72a coincides with the pixel 201, and an error in which the illumination area is displaced from the pixel 201 to the extent that the image quality is not affected. Means to allow.

In this embodiment, each of the sub-pixels 201B, 201R, 201G1, 201G2 has a substantially square shape, and the outer shape of the pixel 201 has a substantially square shape as a whole. Therefore, each pixel 201 has uniform brightness, and the light modulation device 200 can generate image light of good quality without unevenness.

As described above, according to the projector 1 of the present embodiment, by making the incident positions of the respective lights WB, WR, WG1, and WG2 on the superimposing lens 74 different, the micro light provided on the light incident side of the light modulation device 200 can be provided. The light beams WB, WR, WG1, and WG2 can enter the lens array 80 from predetermined directions.

As shown in FIGS. 6 and 7, in the light modulation device 200 of the present embodiment, the microlens array 80 is integrally provided on the surface on the light incident side. The microlens array 80 may be separate from the light modulator 200. FIG. 6 is a diagram showing a cross-sectional configuration of the first sub-pixel 201B and the second sub-pixel 201R. FIG. 7 is a diagram showing a cross-sectional configuration of the third sub-pixel 201G1 and the fourth sub-pixel 201G2.

The microlens array 80 has a plurality of microlenses 80 a, and forms a plurality of minute light fluxes from the light incident on the microlens array 80.
Specifically, as shown in FIG. 6, the blue light WB that has entered the microlens array 80 is divided into a plurality of minute light beams WBb by the plurality of microlenses 80a. The red light WR that has entered the microlens array 80 is split into a plurality of minute light beams WRr by the plurality of microlenses 80a.

As shown in FIG. 7, the first green light WG1 incident on the microlens array 80 is split into a plurality of minute light beams WGg1 by the plurality of microlenses 80a. Further, the second green light WG2 incident on the microlens array 80 is divided into a plurality of minute light beams WGg2 by the plurality of microlenses 80a.

Each microlens 80a is arranged so as to have a one-to-one correspondence with each pixel 201 of the light modulation device 200. The blue light WB of the illumination light W incident on the light modulation device 200 corresponds to the first sub-pixel 201B. That is, the blue light WB which is obliquely incident on the microlens array 80 from below is divided into minute light beams WBb and incident on the first sub-pixel 201B.

The red light WR corresponds to the second sub-pixel 201R. That is, the red light WR that is obliquely incident on the microlens array 80 is divided into minute light beams WRr and is incident on the second sub-pixel 201R.

The first green light WG1 corresponds to the third sub-pixel 201G1. That is, the first green light WG1 that is obliquely incident on the microlens array 80 is divided into the minute light beam WGg1 and is incident on the third sub-pixel 201G1.

The second green light WG2 corresponds to the fourth sub-pixel 201G2. That is, the second green light WG2 that is obliquely incident on the microlens array 80 from below is divided into a minute light beam WGg2 and is incident on the fourth sub-pixel 201G2.

By the way, in order to generate good image light in the light modulation device 200, it is necessary to appropriately make the light of the corresponding color incident on each of the sub-pixels 201B, 201R, 201G1, and 201G2. In order to appropriately enter the light of the colors corresponding to the sub-pixels 201B, 201R, 201G1, and 201G2, it is necessary to sufficiently collimate the lights WB, WR, WG1, and WG2 before entering the superimposing lens 74. is there. However, it is very difficult to sufficiently collimate each light WB, WR, WG1, WG2 due to the aberration of the lens, and each light WB, WR, WG1, WG2 may be a light including a converging component or a diverging component. .. Further, each light WB, WR, WG1, WG2 may include a diffractive component.

FIG. 8A is a diagram showing a relationship between a minute light flux and each sub-pixel when the light shielding member 90 is not provided as a comparative example. FIG. 8B is a diagram showing a relationship between a minute light beam and each sub-pixel in the projector 1 of the present embodiment provided with the light shielding member 90.

When the light shielding member 90 is not provided, as shown in FIG. 8A, each of the minute light beams WBb, WRr, WGg1, WGg2 includes a converging component, a diverging component, or a diffracting component, so that each sub-pixel 201B, 201R, 201G1, 201G2 has Since the image is blurred without being imaged, the image formed by the minute light beams WBb, WRr, WGg1, and WGg2 is larger than the shapes of the sub-pixels 201B, 201R, 201G1, and 201G2.

In this case, for example, the image of the minute light beam WRr is in a state of straddling the region between adjacent sub-pixels in one pixel 201. Therefore, the minute light beam WRr is incident not only on the second sub pixel 201R but also on other sub pixels 201B, 201G1, and 201G2 adjacent to the second sub pixel 201R. This causes bleeding of the image light, which deteriorates the quality of the image light projected on the screen SCR.

On the other hand, in the projector 1 of the present embodiment, a part of the light emitted from the light emitting surface 72a of the second multi-lens array 72 is in the vicinity of the light emitting surface 72a that is optically conjugate with each pixel 201. The light is blocked by the light blocking member 90 provided on the above (see FIGS. 2 and 3).

Here, the light emitted from the second multi-lens array 72 has the light beam diameter most narrowed on the light emitting surface 72a (light emitting surface of the second small lens 76). In the present embodiment, the light blocking member 90 is provided in the vicinity of the light exit surface 72a where the light flux diameter is the smallest, so that the amount of light blocked by the light blocking member 90 is reduced. As a result, the amount of light emitted from the light source unit 110 is reduced by the light shielding member 90, so that the light emitted from the light source unit 110 can be used efficiently.

Further, as described above, the light exit surface 72a of the second multi-lens array 72 and each pixel 201 are substantially optically conjugate with each other, so that the light blocking member 90 is provided at a position that is substantially optically conjugated with each pixel 201. Has been. Thereby, the light transmitted through the light shielding member 90 is favorably incident on each pixel 201 of the light modulation device 200 which is optically substantially conjugate.

FIG. 9 is a plan view showing a schematic configuration of the light shielding member 90. As shown in FIG. 9, the light blocking member 90 is made of, for example, a light blocking member printed with carbon black or the like. The planar shape of the light blocking member 90 is the same as the planar shape of the black matrix BM that divides the four sub-pixels 201B, 201R, 201G1, and 201G2 in each pixel 201 into a grid pattern. That is, regarding the shape of the light shielding member 90, the black matrix BM that partitions each pixel 201 has the same numerical aperture and the same opening shape.

More specifically, the light blocking member 90 has four openings 90a, and the size of the entire shape is equal to or slightly smaller than that of the light exit surface 72a. The light blocking member 90 is formed so as to have a similar relationship with the black matrix BM (see FIG. 6) that partitions each pixel 201 of the light modulation device 200. That is, the planar shape of each opening 90a is similar to the sub-pixels 201B, 201R, 201G1, and 201G2 in each pixel 201. Accordingly, by appropriately adjusting the magnifications of the superimposing lens 74 and the microlens 80a, the light transmitted through each opening 90a can be efficiently incident on each sub-pixel 201B, 201R, 201G1, 201G2 of the light modulation device 200. it can.

The light blocking member 90 converts the light emitted from the light emission surface 72a of the second multi-lens array 72 so that the shape of the light passing through each opening 90a corresponds to the shape of each sub-pixel 201B, 201R, 201G1, 201G2. Block some light. The four openings 90a are composed of a first opening 90a1, a second opening 90a2, a third opening 90a3, and a fourth opening 90a4.

Here, the first opening 90a1 corresponds to the first sub-pixel 201B, the second opening 90a2 corresponds to the second sub-pixel 201R, and the third opening 90a3 corresponds to the third sub-pixel 201G1. , And the fourth opening 90a4 corresponds to the fourth sub-pixel 201G2.

That is, in the light shielding member 90, the blue light flux LB of the light flux LA emitted from the light emission surface 72a of the second multi-lens array 72 is incident on the first opening 90a1. As a result, for example, even if the blue light beam LB does not become sufficiently parallel due to the aberration and includes a converging component, a diverging component, or a diffracting component, these converging component, diverging component, or diffracting component cannot pass through the first opening 90a1. It is cut by the light blocking member 90.

Further, the red light flux LR of the light flux LA emitted from the light exit surface 72a of the second multi-lens array 72 is incident on the second opening 90a2. As a result, for example, even if the red light beam LR is not sufficiently collimated due to aberration and includes a converging component, a diverging component, or a diffracting component, these converging component, diverging component, or diffracting component cannot pass through the second opening 90a2. It is cut by the light blocking member 90.

Further, the first green light flux LG1 of the light flux LA emitted from the light exit surface 72a of the second multi-lens array 72 is incident on the third opening 90a3. As a result, for example, even when the first green light beam LG1 is not sufficiently collimated due to aberration and includes a converging component, a diverging component, or a diffracting component, the converging component, the diverging component, or the diffracting component does not pass through the third opening 90a3. It cannot be transmitted and is cut by the light blocking member 90.

Further, the second green light flux LG2 of the light flux LA emitted from the light exit surface 72a of the second multi-lens array 72 is incident on the fourth opening 90a4. As a result, for example, even when the second green light beam LG2 is not sufficiently collimated due to aberration and includes a converging component, a diverging component, or a diffracting component, the converging component, the diverging component, or the diffracting component does not pass through the fourth opening 90a4. It cannot be transmitted and is cut by the light blocking member 90.

As described above, according to the projector 1 of the present embodiment, the second multi-lens is configured so that the shape of the light transmitted through each opening 90a of the light shielding member 90 corresponds to the shape of each sub-pixel 201B, 201R, 201G1, 201G2. A part of the light emitted from the light emitting surface 72a of the array 72 is blocked.

As a result, according to the projector 1 of the present embodiment, as shown in FIG. 8B, each of the minute light beams WBb, WRr, WGg1, WGg2 is favorably incident on the corresponding sub-pixel 201B, 201R, 201G1, 201G2. You can Therefore, each of the minute light beams WBb, WRr, WGg1, WGg2 does not cross the area between the adjacent sub pixels. That is, as shown in FIG. 8B, for example, the minute light beam WRr enters only the second sub-pixel 201R and does not enter the black matrix BM that partitions the second sub-pixel 201R.

Therefore, it is possible to prevent the occurrence of color mixture due to the light of the same color being incident on the sub-pixels 201B, 201R, 201G1, and 201G2 adjacent to each other, while improving the efficiency of using the light from the lighting device 100. Therefore, the projector 1 can project a high-quality image with reduced bleeding on the screen SCR.

Further, according to the projector 1 of the present embodiment, the amount of light incident on the black matrix BM in each pixel 201 can be reduced by the light blocking member 90, so that the generation of heat in the black matrix BM is suppressed and the black matrix BM due to heat is suppressed. Can be suppressed. Therefore, according to the projector 1 of the present embodiment, by extending the life of the black matrix BM, it is possible to display a high-quality image for a long period of time.

The present invention is not limited to the contents of the above-described embodiment, and can be modified as appropriate without departing from the spirit of the invention.
In the projector 1 of the above-described embodiment, the case where the lens integrator unit 70 having the first multi-lens array 71 and the second multi-lens array 72 is provided has been described as an example, but the present invention is not limited to this and, for example, the first You may make it provide only the multi-lens array 71. In this case, the light blocking member 90 is provided between the light exit side of the first multi-lens array 71 and the superposing lens 74.

In the above embodiment, the case where the light blocking member 90 is provided in the vicinity of the light exit surface 72a has been described as an example, but the position where the light blocking member 90 is arranged is not limited to this. For example, the light blocking member 90 may be arranged anywhere between the light exit surface of the second multi-lens array 72 and the superimposing lens 74.

In the above-described embodiment, the light source unit 110 that emits three-color light is described as an example, but the light source unit 110 may be one that emits at least two-color light. That is, the light source unit 110 may be configured to emit light of two colors, for example, red light, blue light, and green light. In this case, each pixel 201 of the light modulation device 200 is configured of two sub pixels. Will be done.

In the light source unit 110 of the above embodiment, the case where the red light flux LR and the green light flux LG are generated by separating the yellow fluorescence YL generated by exciting the phosphor element 32 has been described as an example. At least one of the light flux LR and the green light flux LG may be generated by fluorescence.

The arrangement of the sub-pixels 201B, 201R, 201G1, and 201G2 forming each pixel 201 of the light modulation device 200 according to the above-described embodiment is not limited to the configuration shown in FIG. 6, and for example, the third sub-pixel 201G1 and A Bayer array structure in which the fourth sub-pixels 201G2 are arranged side by side in the diagonal direction in the pixel 201 may be adopted.

DESCRIPTION OF SYMBOLS 1... Projector, 71... 1st multi-lens array, 72... 2nd multi-lens array, 72a... Light emission surface, 73... Polarization conversion element, 74... Superimposing lens, 75... 1st small lens, 76... 2nd small lens , 80... Microlens array, 80a... Microlens, 90... Light blocking member, 110... Light source unit, 200... Light modulator, 201... Pixel, 201B... Subpixel, 300... Projection optical device, BM... Black matrix (lattice part) ), LB... Blue light flux (first color light), LR... Red light flux (second color light).

Claims (5)

A light source unit that emits light including at least a first color light and a second color light;
A first multi-lens array on which the light is incident;
A superimposing lens that is provided in a subsequent stage of the first multi-lens array and that allows the first color light and the second color light to enter different positions.
A light blocking member that is provided between the light exit side of the first multi-lens array and the superimposing lens and blocks a part of the light;
A light modulator including a plurality of pixels including a plurality of sub-pixels;
A microlens array including a plurality of microlenses corresponding to each of the plurality of pixels in a one-to-one relationship;
A projection optical device that projects light emitted from the light modulation device. The projector according to claim 1, further comprising a polarization conversion element provided between the light exit side of the first multi-lens array and the superimposing lens. The projector according to claim 1, further comprising a second multi-lens array having a plurality of second small lenses arranged corresponding to the plurality of first small lenses of the first multi-lens array, respectively. The projector according to claim 3, wherein the light blocking member is provided between the light exit surface of the second multi-lens array and the superimposing lens. The planar shape of the light-shielding member is the same as the planar shape of a lattice part that divides the plurality of sub-pixels into a lattice pattern in one pixel of the plurality of pixels. Projector.

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