JP2004354938A - Illumination optical system and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination optical system which is provided with an aperture-stop near an optical integrator and in which the degradation in the uniformity in the illuminance of a surface to be irradiated occurring in the aperture diaphragm is prevented. <P>SOLUTION: The opening shape of the aperture-stop 14 is matched with the sectional shape within the perpendicular plane of the optical axis at the image principal point of the lenses of at least a part of the numbers of cells 30 among a plurality of the cells 30 constituting the optical integrator. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an illumination optical system used for an image display device such as a projector.
[0002]
[Prior art]
2. Description of the Related Art In an image display device such as a liquid crystal projector, an aperture stop is often provided on a secondary light source surface in the vicinity of an optical integrator such as a lens array to restrict a light flux to an irradiated surface which is an image conjugate surface. . By making the size of the aperture of the aperture stop variable, the brightness, sharpness, and contrast of the image can be adjusted, and an image with high image quality can be obtained.
[0003]
Conventionally, the aperture shape of the aperture stop has often been a circular shape regardless of the shape of the cell constituting the optical integrator.
[0004]
Conventionally, it has also been proposed to make the aperture shape of the aperture stop substantially similar to the irradiated surface of the liquid crystal panel (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-9-31292 (Paragraph No. 0028, FIG. 1)
[0006]
[Problems to be solved by the invention]
However, the conventional aperture stop having such an aperture shape partially shields cells and the like in the vicinity of the optical integrator among many cells constituting the lens array.
[0007]
The lens array has a role of increasing the uniformity of the illuminance on the irradiated surface by illuminating the same irradiated surface with the individual cells superimposed. However, the area of the part shielded by the aperture stop and the area of the part not shielded by the aperture stop are relatively close (for example, a half of the entire cell area is shielded by the aperture stop). Since the same area is superimposed and no longer illuminated, the uniformity of the illuminance on the surface to be illuminated is reduced, the image contrast is lost, and the image quality is reduced.
[0008]
In view of the above, the present invention provides an illumination optical system having an aperture stop in the vicinity of an optical integrator, and a display device such as a liquid crystal projector having such an illumination optical system. An object of the present invention is to prevent a reduction in illuminance uniformity.
[0009]
[Means for Solving the Problems]
In order to solve this problem, the present applicant has an optical integrator for forming a multiple light source composed of a plurality of light source images based on a light beam supplied from a light source means, and a multiple light source formed by the optical integrator. In an illumination optical system for converging and illuminating the illuminated surface through a light-shielding unit that shields a wavelength outside the visible light region, an aperture stop that restricts the luminous flux is provided near the optical integrator. The present invention proposes an illumination optical system in which the aperture shape of the aperture stop matches the cross-sectional shape of a plurality of cells in a plane perpendicular to the optical axis at the image principal point of the lens of the cell forming the optical integrator.
[0010]
In this illumination optical system, the aperture shape of the aperture stop provided near the optical integrator has a cross-sectional shape composed of a plurality of cells in a plane perpendicular to the optical axis at the image principal point of the lens of the cell forming the optical integrator. Matches.
[0011]
Therefore, cells in the range where the cross-sectional shape matches the aperture shape of this aperture stop are not shielded by this aperture stop at all, and on the other hand, when there are cells constituting the optical integrator other than those cells, the The cell is completely shielded from light by this aperture stop.
[0012]
In this way, the aperture shape of the aperture stop is adapted to the shape of the cell, and the cell is not light-shielded at all, or if one is to be light-shielded, the entire cell is light-shielded. No more. Accordingly, the light beams emitted from the individual cells overlap and illuminate the same region of the irradiated surface, so that the uniformity of the illuminance on the irradiated surface is prevented from lowering.
[0013]
In this illumination optical system, as an example, the aperture stop has a variable aperture size, and when the aperture size changes, the optical axis at the image principal point of the lens of a plurality of cells constituting the lens array is changed. In the vertical plane, it is preferable that the shape of the opening matches the cross-sectional shape formed by the number of cells closest to the size of the stop.
[0014]
Thus, for example, in a display device provided with this illumination optical system, even when adjusting the brightness, sharpness, and contrast of an image by changing the size of the aperture of the aperture stop, the illuminance on the illuminated surface is uniform. This can prevent the deterioration of the property.
[0015]
The aperture stop is shared by a plurality of illumination optical systems having different shapes and sizes of the optical integrator (the shape and size of the cells are common but the number of cells is different). It is possible to prevent a decrease in the uniformity of the illuminance.
[0016]
Next, the present applicant has an optical integrator for forming a multiple light source composed of a plurality of light source images based on the light flux supplied from the light source means, and collects the light flux of the multiple light source formed by the optical integrator. In an illumination optical system that illuminates a surface to be irradiated in a superimposed manner through a light-shielding unit that shields a wavelength outside the visible light region, an aperture stop that restricts a light beam is provided near the optical integrator. The aperture shape of the aperture is set such that, for each cell constituting the optical integrator, the ratio of the area through which the light beam is transmitted without being blocked by this aperture stop to the area in the plane perpendicular to the optical axis at the image principal point of the lens of the cell. The present invention proposes an illumination optical system having a shape of any one of 9 or more and 0.1 or less.
[0017]
In this illumination optical system, the aperture shape of the aperture stop provided in the vicinity of the optical integrator is such that, for each cell constituting the optical integrator, this area of the area within the plane perpendicular to the optical axis at the image principal point of the lens of the cell. The shape is such that the ratio of the area through which the light beam is transmitted without being blocked by the aperture is approximately 0.9 or more and approximately 0.1 or less.
[0018]
Therefore, each of the cells is hardly shielded by the aperture stop (90% or more) or almost completely shielded by the aperture stop (90% or more).
[0019]
As described above, the aperture shape of the aperture stop is adapted to the area of the cell, and almost no light is shielded from the cell, or almost all of one cell is shielded if light is shielded. The area of the part that is shielded from light by the aperture stop and the area of the part that is not shielded from light are relatively close (the ratio of the area that is shielded from light becomes 10% or more and less than 90%). Accordingly, the light beams emitted from the individual cells overlap and illuminate substantially the same area on the surface to be irradiated, so that the uniformity of the illuminance on the surface to be irradiated is prevented from lowering.
[0020]
In this illumination optical system, as an example, an aperture stop is a light flux that is not shielded by the aperture stop and is an area of an individual cell constituting an optical integrator in a plane in a plane perpendicular to an optical axis at an image principal point of a lens of the cell. Of the first aperture shape that makes the ratio of the area through which the light passes through approximately 0.9 or more and approximately 0.1 or less, and the light at the image principal point of the lens of the cell with respect to each cell constituting the optical integrator. Between the area of the area in the plane perpendicular to the axis and the second aperture shape which makes the ratio of the area through which the light beam is transmitted without being blocked by the aperture stop approximately 0.9 or more or approximately 0.1 or less; Preferably, the size of the opening is variable.
[0021]
Thus, for example, in a display device provided with this illumination optical system, even when adjusting the brightness, sharpness, and contrast of an image by changing the size of the aperture of the aperture stop, the illuminance on the illuminated surface is uniform. This can prevent the deterioration of the property.
[0022]
The aperture stop is shared by a plurality of illumination optical systems having different shapes and sizes of the optical integrator (the shape and size of the cells are common but the number of cells is different). It is possible to prevent a decrease in the uniformity of the illuminance.
[0023]
Next, the present applicant provides light source means for supplying a light beam, an optical integrator for forming a multiple light source composed of a plurality of light source images based on the light beam from the light source means, and an optical integrator formed by the optical integrator. An illumination optical system for condensing the light fluxes of the multiple light sources and illuminating the irradiated surface in a superimposed manner, and an optical device for displaying visible light having a light shielding unit for shielding a wavelength outside the visible light region, An aperture stop that restricts the light flux is provided near the optical integrator, and the aperture shape of the aperture stop is defined by a plurality of cells in a plane perpendicular to the optical axis at the image principal point of the lens of the cell that forms the optical integrator. A display device that matches the configured cross-sectional shape is proposed.
[0024]
Further, a light source means for supplying a light beam, an optical integrator for forming a multiple light source composed of a plurality of light source images based on the light beam from the light source means, and a light beam of the multiple light source formed by the optical integrator An illumination optical system that condenses and illuminates the irradiated surface by superimposing it, and an optical device that uses visible light for display with a light-shielding unit that shields wavelengths outside the visible light region is provided.In the vicinity of the optical integrator, An aperture stop for restricting a light beam is provided, and the aperture shape of the aperture stop is, for each cell constituting the optical integrator, of the area in the plane perpendicular to the optical axis at the image principal point of the lens of the cell. The display device has a shape in which the ratio of the area through which the light flux is transmitted without being shielded from light is substantially 0.9 or more or 0.1 or less. To draft.
[0025]
These display devices have the above-described illumination optical system according to the present invention, and can prevent a decrease in illuminance uniformity on a surface to be illuminated and improve image quality.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example in which the present invention is applied to a liquid crystal projector will be specifically described with reference to the drawings. FIG. 1 shows an illumination optical system of a liquid crystal projector to which the present invention is applied. After the light emitted from the light source 10 is shielded from ultraviolet and infrared rays by the visible light shielding means 27 (for example, a UV-IR cut filter) and converted into a parallel light flux by the optical system 11, an optical integrator is formed. The light enters the first lens array 12 of the first lens array 12 and the second lens array 13 and is divided by a plurality of lens cells. Then, a plurality of secondary light source images are formed in the vicinity of the second lens array 13 by emitting light from each lens cell of the first lens array 12 to the corresponding lens cell of the second lens array 13. .
[0027]
An aperture stop 14 is provided on the secondary light source surface. Of the light beams emitted from each lens cell of the second lens array 13, the light beams transmitted through the aperture stop 14 are superimposed by an optical system 15, separated by a color separation optical system (not shown), and applied to a liquid crystal panel. You.
[0028]
FIG. 2 shows the cross-sectional shapes of the first lens array 12 and the second lens array 13 in the plane perpendicular to the optical axis at the image principal point of the lens cell. Each of the first lens array 12 and the second lens array 13 is composed of a total of 25 rectangular lens cells 30 of 5 (horizontal in the figure) × 5 (horizontal in the figure). The size of the range in which the lens cells 30 are arranged in the first lens array 12 and the second lens array 13 has a horizontal length of x_a and a vertical length of y_a.
[0029]
FIG. 3 shows a cross-sectional shape of the aperture stop 14 in a plane perpendicular to the optical axis. The aperture stop 14 is configured such that a hatched portion in the drawing blocks a light beam, and the light beam passes through a rectangular opening surrounded by the hatched portion.
[0030]
The aperture stop 14 matches the horizontal length x_s and the vertical length y_s of the opening with the horizontal length x_a and the vertical length y_a of the first lens array 12 and the second lens array 13, respectively. Being manufactured.
[0031]
FIG. 4 shows how light is blocked by the aperture stop 14. Since the horizontal length x_s and the vertical length y_s of the aperture of the aperture stop 14 match the horizontal length x_a and the vertical length y_a of the lens cell array range of the second lens array 13, respectively. The aperture shape of the aperture stop 14 matches the cross-sectional shape in the plane perpendicular to the optical axis at the image principal point of the lens of all 25 lens cells 30 of the second lens array 13.
[0032]
Therefore, all 25 lens cells 30 of the second lens array 13 are not blocked by the aperture stop 14 at all, and only the peripheral portion of the second lens array 13 (portion where the lens cells 30 are not arranged) is formed by the aperture stop 14. It is shaded.
[0033]
As described above, since the aperture shape of the aperture stop 14 is adapted to the shape of the lens cell 30 and the lens cell 30 is not shielded at all, the lens cell 30 is not partially shielded from light. Accordingly, the light beams emitted from the individual lens cells 30 overlap and illuminate the same area of the surface to be illuminated, so that the uniformity of the illuminance on the surface to be illuminated is prevented from lowering, and the image quality is improved.
[0034]
The horizontal length x_s and the vertical length y_s of the aperture of the aperture stop 14 are completely matched with the horizontal length x_a and the vertical length y_a of the lens cell array range of the second lens array 13, respectively. Also in the case of manufacturing, the lens cell 30 near the periphery of the second lens array 13 may be partially shielded by the aperture stop 14 due to an error at the time of manufacture or an error at the time of disposing the aperture stop 14.
[0035]
For example, the horizontal length x_c and the vertical length y_c in the plane perpendicular to the optical axis at the image principal point of the lens of each lens cell 30 of the second lens array 13 are 12.0 mm and 10.0 mm, respectively. When the horizontal length x_a and the vertical length y_a of the lens cell array range of the second lens array 13 are 60.0 mm and 50.0 mm, respectively, the aperture stop 14 adjusts the horizontal length x_s, It is assumed that the vertical length y_s is manufactured to be 59.0 mm and 49.0 mm, respectively.
[0036]
At this time, the lens cells 30 other than the central nine lens cells 30 of the second lens array 13 include a portion that is not shielded by the aperture stop 14 (referred to as a transmission area) and a portion that is shielded by the aperture stop 14 (shielded). Area). Of these, the largest areas of the light-shielding regions are the lens cells 30 at the four corners of the second lens array 13, and FIG. 5 shows the transmission regions 30i (white regions) and the light-shielding regions 30s of these lens cells 30. (Shaded area).
[0037]
However, while the area of the lens cell 30 is 12.0 × 10.0 = 120.0 mm 2, the area of the transmission region 30 i is 11.5 × 9.5 = 109.25 mm 2 (the area of the light shielding region 30 s). Is 10.75 mm2), and the ratio of the area of the transmission region 30i to the area of the lens cell 30 is 109.25 / 120.0 = 0.91. Therefore, the lens cells 30 at the four corners are also hardly shielded by the aperture stop 14 (91% or more).
[0038]
Therefore, also in this case, the area of the portion of one lens cell 30 that is shielded from light by the aperture stop 14 does not become relatively close to the area of the portion that is not shielded from light. Accordingly, the light beams emitted from the individual cells overlap and illuminate substantially the same area on the surface to be irradiated, so that the uniformity of the illuminance on the surface to be irradiated is prevented from lowering.
[0039]
In general, the aperture shape of the aperture stop 14 is shielded by the aperture stop 14 of the area in the plane perpendicular to the optical axis at the principal image point of the lens of the lens cell 30 for each lens cell 30 of the second lens array 13. If the ratio of the area through which the luminous flux is transmitted is not less than about 0.9 or not more than about 0.1, each lens cell 30 is almost (90% or more) light-shielded by the aperture stop 14. Or the light is almost completely (90% or more) shielded by the aperture stop 14.
[0040]
In this manner, the aperture shape of the aperture stop 14 is adapted to the area of the lens cell 30 so that the lens cell 30 is hardly light-shielded or, if it is light-shielded, substantially all of one lens cell 30 is light-shielded. For example, in one lens cell 30, the area of the part shielded by the aperture stop 14 and the area of the part not shielded by the aperture stop 14 are relatively close (the ratio of the area shielded by light is 10% or more and less than 90%). Disappears.
[0041]
Therefore, since the light beams emitted from the individual lens cells 30 overlap and illuminate substantially the same area on the surface to be illuminated, the uniformity of the illuminance on the surface to be illuminated is also prevented from lowering. The present invention includes a case where the aperture stop 14 has such an aperture shape.
[0042]
Next, FIG. 6 shows another configuration example of the aperture stop installed in the illumination optical system of FIG. The aperture stop 31 is configured by combining two L-shaped plates.
[0043]
The aperture stop 31 displaces these plates by a drive mechanism (motor or the like) (not shown) so that the aperture stop 31 at the image principal point of the lens of all 25 lens cells 30 of the second lens array 13 as shown in FIG. 7A. FIG. 7B shows a state in which the opening shape matches the cross-sectional shape in the plane perpendicular to the optical axis, and the lenses of the central nine lens cells 30 of the 25 lens cells 30 of the second lens array 13 as shown in FIG. The size of the opening is variable between the state where the opening shape matches the cross-sectional shape of the image principal point in the plane perpendicular to the optical axis.
[0044]
When the aperture stop 31 is in the state shown in FIG. 7A, all 25 lens cells 30 of the second lens array 13 are completely shielded from the light by the aperture stop 14, similarly to the case where the aperture stop 14 in the example of FIG. Not done. As a result, the lens cells 30 are not partially shielded, and the light beams emitted from the individual lens cells 30 illuminate the same area of the irradiated surface in a superimposed manner, so that the illuminance on the irradiated surface is uniform. Is prevented from decreasing.
[0045]
On the other hand, when the aperture stop 31 is in the state shown in FIG. 7B, of the 25 lens cells 30 of the second lens array 13, the central nine lens cells 30 are not blocked by the aperture stop 14 at all, and All other 16 lens cells 30 are shielded from light by the aperture stop 14.
[0046]
In this way, if the lens cell 30 is not light-shielded at all, or if it is light-shielded on the contrary, the entire lens cell 30 is light-shielded. In this case, the lens cell 30 will not be partially shielded. Accordingly, the light beams emitted from the individual lens cells 30 illuminate the same area of the irradiated surface in a superimposed manner, so that the uniformity of the illuminance on the irradiated surface is prevented from lowering.
[0047]
Therefore, by arranging the aperture stop 31, even when the size of the aperture of the aperture stop 31 is changed to adjust the brightness, sharpness, and contrast of the image, the uniformity of the illuminance on the irradiated surface is reduced. Can be prevented.
[0048]
Further, the illumination optical system of FIG. 1 and the illumination optical system of FIG. 1 have different shapes and sizes of the entire optical integrator (the shapes and sizes of the cells are common but the number of cells is different). By sharing this aperture stop with the optical system, it is possible to prevent a reduction in the uniformity of the illuminance on each of the irradiated surfaces.
[0049]
Next, a configuration example of the aperture stop when the lens cell of the second lens array has a shape other than a rectangle will be described. FIG. 8 shows a cross-sectional shape of the second lens array 32 composed of hexagonal lens cells 33 in a plane perpendicular to the optical axis at the image principal point of the lens cells 33.
[0050]
FIG. 9 shows a cross-sectional shape in a plane perpendicular to the optical axis of an aperture stop 34 installed on the secondary light source surface of the illumination optical system provided with the second lens array 32. In the aperture stop 34, the hatched portion in the figure blocks the light beam, and the light beam passes through the opening surrounded by the hatched portion.
[0051]
The opening has an elliptical shape having an area slightly smaller than the area of the second lens array 32 in which the lens cells 33 are arranged. However, if the elliptical shape remains, the ratio of the light-shielded area to the area of the image principal point of the lens of the lens cell 33 of the second lens array 32 in the plane perpendicular to the optical axis becomes 10% or more and less than 90% (up and down). Each of the lens cells 33 has a shape in which a hexagon having the same size as the lens cell 33 protrudes as a light-shielding portion so that all of the lens cells 33 can be shielded from light.
[0052]
FIG. 10 shows how the lens cells 33 of the second lens array 32 are shielded from light by the aperture stop 34. Typically, as shown as a lens cell 33 (1), the lens cell 33 whose light-shielding area ratio is 10% or more and less than 90% when the opening remains elliptical has a hexagonal light-shielding portion in the opening. All the light is shielded by protruding.
[0053]
In addition, as representatively shown as a lens cell 33 (2), in some lens cells 33 near the periphery of the second lens array 32, as shown in FIG. (2) i and the light-shielding region 33 (2) s, which is shielded by the aperture stop 34, are mixed. The ratio of the area of the light-shielding region to the area of these lens cells 33 is 90% or more or 1% or more. It is one of the following.
[0054]
In this manner, the aperture shape of the aperture stop 34 is adapted to the area of the lens cell 33, and the lens cell 33 is hardly light-shielded or, if it is light-shielded, almost all of one lens cell 33 is light-shielded. Therefore, the area of the part shielded by the aperture stop 34 and the area of the part not shielded by the aperture stop 34 in one lens cell 33 are relatively close (the ratio of the area shielded by light is 10% or more and less than 90%). There is no.
[0055]
Therefore, since the light beams emitted from the individual lens cells 33 illuminate while superimposing substantially the same area on the surface to be illuminated, a reduction in the uniformity of the illuminance on the surface to be illuminated is prevented.
[0056]
【The invention's effect】
As described above, according to the illumination optical system of the present invention, in an illumination optical system provided with an aperture stop near an optical integrator, it is possible to prevent a decrease in illuminance uniformity of a surface to be illuminated due to the aperture stop. The effect is obtained.
[0057]
Further, in a display device provided with this illumination optical system, even when the brightness, clarity, and contrast of an image are adjusted by changing the size of the aperture of the aperture stop, the uniformity of the illuminance on the irradiated surface is reduced. Is also obtained.
[0058]
This aperture stop is shared by a plurality of illumination optical systems with different optical integrators in shape and size (the shape and size of the cells are common but the number of cells is different). The effect of preventing a decrease in uniformity can also be obtained.
[0059]
Further, according to the display device of the present invention, it is possible to prevent the illuminance uniformity of the irradiated surface from being deteriorated due to the aperture stop provided near the optical integrator, thereby improving the image quality. Can be
[Brief description of the drawings]
FIG. 1 is a diagram showing an illumination optical system of a liquid crystal projector to which the present invention has been applied.
FIG. 2 is a diagram showing a first lens array and a second lens array of FIG. 1;
FIG. 3 is a diagram showing the aperture stop of FIG. 1;
FIG. 4 is a diagram showing how light is blocked by the aperture stop shown in FIG. 1;
FIG. 5 is a diagram illustrating a light-shielding region of a lens cell of the second lens array in FIG. 1;
FIG. 6 is a diagram showing another example of the aperture stop installed in the illumination optical system of FIG. 1;
FIG. 7 is a diagram showing how light is blocked by the aperture stop shown in FIG. 6;
FIG. 8 is a diagram showing another example of the shape of the lens cell of the second lens array.
FIG. 9 is a diagram showing another example of the aperture stop.
FIG. 10 is a diagram showing how light is blocked by the aperture stop shown in FIG. 9;
11 is a diagram showing a light-shielding area of a lens cell of the second lens array of FIG. 1 by the aperture stop of FIG. 9;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Light source, 11 optical system, 12 1st lens array, 13, 32 2nd lens array 14, 31, 34 Aperture stop, 15 Optical system, 27 Visible light shielding means, 30, 33 Lens cell

Claims (6)

An optical integrator for forming a multiple light source composed of a plurality of light source images based on the light flux supplied from the light source means is provided, and the optical flux of the multiple light source formed by the optical integrator is collected, outside the visible light region. In an illumination optical system that overlaps and illuminates a surface to be illuminated via a light shielding unit that shields a wavelength, an aperture stop that restricts a light flux is provided near the optical integrator,
An illumination optical system, wherein an aperture shape of the aperture stop matches a cross-sectional shape formed by a plurality of cells in a plane perpendicular to an optical axis at an image principal point of a lens of a cell constituting the optical integrator. The illumination optical system according to claim 1,
The illumination, wherein the aperture stop has a shape that is variable while the aperture shape has a shape corresponding to a cross-sectional shape formed by the number of cells closest to the size of the aperture among the plurality of cells. Optical system. An optical integrator for forming a multiple light source composed of a plurality of light source images based on the light flux supplied from the light source means is provided, and the optical flux of the multiple light source formed by the optical integrator is collected, outside the visible light region. In an illumination optical system that overlaps and illuminates a surface to be illuminated via light shielding means that shields a wavelength,
An aperture stop for restricting a light beam is provided near the optical integrator,
The aperture shape of the aperture stop is, for each cell constituting the optical integrator, of the area in the plane perpendicular to the optical axis at the image principal point of the lens of the cell, of the area through which the light flux is transmitted without being blocked by the aperture stop. An illumination optical system characterized in that the ratio is set to be approximately 0.9 or more and approximately 0.1 or less. The illumination optical system according to claim 3,
The aperture stop is, for each of the cells constituting the optical integrator, approximately the ratio of the area through which the light is transmitted without being shielded by the aperture stop, of the area in the plane perpendicular to the optical axis at the image principal point of the lens of the cell. A first aperture shape which is not less than 0.9 or not more than approximately 0.1, and an area of each cell constituting the optical integrator in a plane perpendicular to the optical axis at an image principal point of a lens of the cell. The size of the opening is variable between the second opening shape and the ratio of the area through which the light flux is transmitted without being blocked by the aperture stop is approximately 0.9 or more or approximately 0.1 or less. An illumination optical system characterized in that: A light source unit for supplying a light beam, an optical integrator for forming a multiple light source composed of a plurality of light source images based on the light beam from the light source unit, and a light beam of the multiple light source formed by the optical integrator An illumination optical system for superimposing and illuminating the irradiated surface with light, and an optical device that uses visible light for display with a light shielding unit that shields a wavelength outside the visible light region,
An aperture stop for restricting a light beam is provided near the optical integrator,
A display device, wherein an aperture shape of the aperture stop matches a cross-sectional shape formed by a plurality of cells in a plane perpendicular to an optical axis at an image principal point of a lens of a cell forming the optical integrator. A light source unit for supplying a light beam, an optical integrator for forming a multiple light source composed of a plurality of light source images based on the light beam from the light source unit, and a light beam of the multiple light source formed by the optical integrator An illumination optical system for superimposing and illuminating the irradiated surface with light, and an optical device that uses visible light for display with a light shielding unit that shields a wavelength outside the visible light region,
An aperture stop for restricting a light beam is provided near the optical integrator,
The aperture shape of the aperture stop is, for each cell constituting the optical integrator, of the area in the plane perpendicular to the optical axis at the image principal point of the lens of the cell, of the area through which the light flux is transmitted without being blocked by the aperture stop. A display device having a shape in which the ratio is approximately 0.9 or more and approximately 0.1 or less.

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