JPH07174974A - Illuminator and projection type display device - Google Patents

Abstract

PURPOSE:To obtain an illuminator in which the loss of light quantity is small and whose secondary light source is small in size by arranging an aspherical lens on the luminous flux incident side of an integrator. CONSTITUTION:The illuminator is constituted by including a light source lamp 101, a reflector 102, and a uniform illuminating optical element consisting of two lens plates 103 and 104 where plural spherical lenses are planarly arranged. In such constitution, the aspherical lens 201 is arranged between the reflector 102 and the uniform illuminating optical element. The lamp 101 is a light source proximate to a point light source such as a halogen lamp, etc., and the luminous flux radiated therefrom is unidirectionally reflected by the reflector 102. As to the shape of the reflector 102, the inclination of each part on its cross section is consecutively decided by calculation, so that it can not be expressed by an easy numerical expression like a parabola and an ellipse but expressed approximately in a high-order function. The reflected luminous flux is made incident on the lens 201 next and the main light beam of the luminous flux made incident on the respective parts of the lens 201 is angularly changed in a direction parallel with an optical axis 203.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device for uniformly illuminating a rectangular shape and a projection type display device for enlarging and displaying an image on a liquid crystal panel or the like on a screen.

[0002]

2. Description of the Related Art As a method of uniformly illuminating a target area, there is a method of using a uniform illumination optical element composed of two lens plates, which is generally called an integrator illumination system. An example of the structure is shown in FIG. The light emitted from the light source lamp 101 is reflected by the reflector 102,
The light flux emitted substantially in parallel passes through two lens plates 103 and 104 in which a plurality of spherical lenses are arranged in a matrix, and further passes through an auxiliary lens 105 to be illuminated 1
Illuminate 06 evenly. Here, the first lens plate 10
3 is composed of a plurality of rectangular lenses, and each rectangular lens forms an image of the light source at the center of the corresponding rectangular lens in the second lens plate 104. Then, the first lens plate 103
The images of the respective rectangular lenses are formed on the illumination target 106 in an overlapping manner by the functions of the second lens plate 104 and the auxiliary lens 105. Therefore, the illumination target 106 is the first lens plate 10
Illuminated in a rectangular shape similar to the rectangular lens of No. 3. In addition,
Here, the first lens plate 103 and the second lens plate 104
Are the same, and the focal length of each rectangular lens is equal to the distance between them. The focal length of the auxiliary lens 105 is equal to the distance between the auxiliary lens 105 and the illumination target 106.

The integrator illumination system has been conventionally used for an illumination system of an exposure machine or a projection type display device, and recently, it has been particularly used for an illumination system of a liquid crystal projector for projecting and displaying an image on a liquid crystal panel. A specific method for the liquid crystal projector is described in detail in Japanese Patent Laid-Open No. 3-111806.

A reflector used in a conventional integrator illumination system has a spherical shape, a paraboloid of revolution, a spheroid of revolution, or a hyperboloid of revolution. The reflected light beam is directly or after passing through a spherical lens. Had been incident on the lens plate.

[0005]

However, in the above method, the angular distribution of the light beam incident on the first lens plate is different for each lens, and in general, the central portion of the incident light beam has a large angle variation. There is a problem that a light amount loss occurs at the central portion of the second lens plate. That is, FIG.
As shown in (B), the light source image formed on the second lens plate 104 becomes larger as it is formed near the center of the lens plate, and the light source image 107 at the center has the peripheral portion within the rectangular lens. Since it could not be cut off, there was a loss of light. In addition, the light source image 10 formed on the periphery of the second lens plate 10
Since 8 is very small, a considerable gap was generated between adjacent light source images, and the apparent light source on the second lens plate, that is, the entire secondary light source was unnecessarily large.

Therefore, the present invention solves such a problem, and an object of the present invention is to provide an illumination system using an integrator, which has a very small light quantity loss and a small secondary light source. Is to provide.
Further, it is another object of the present invention to provide a projection display device that is small in size and has high light utilization efficiency by applying the lighting device to an illumination optical system of a liquid crystal projector.

[0007]

SUMMARY OF THE INVENTION An illumination device according to the present invention comprises a light source lamp, a reflector for reflecting a light beam emitted from the light source lamp in one direction, and two lenses in which a plurality of spherical lenses are two-dimensionally arranged. In an illumination device including a plate-based uniform illumination optical element, an aspherical lens is arranged between the reflector and the uniform illumination optical element.

In the uniform illumination optical element, the first lens plate in which a plurality of rectangular lenses are two-dimensionally arranged without a gap and the same number of rectangular lenses as the rectangular lenses included in the first lens plate are provided without a gap. It is characterized in that it is composed of a second lens plate arranged in a plane.

Further, the uniform illumination optical element includes a first lens plate in which a plurality of rectangular lenses are arranged in a plane without a gap, and a hexagonal lens in the same number as the rectangular lenses included in the first lens plate. It is characterized in that it is configured with a second lens plate arranged in a plane without a gap.

Further, the uniform illumination optical element has a gap between a first lens plate having a plurality of rectangular lenses arranged in a plane without gaps and a diamond-shaped lens having the same number as the rectangular lenses included in the first lens plate. And a second lens plate arranged in a plane.

Further, the light source lamp includes a light source lamp, a reflector for reflecting a light beam emitted from the light source lamp in one direction, and a uniform illumination optical element having four lens plates on which a plurality of cylindrical lenses are arranged in a plane. In the illumination device, between the reflector and the uniform illumination optical element,
It is characterized by arranging an aspherical lens.

The uniform illumination optical element 4 is constructed.
The present invention is characterized in that two lens plates are integrated to form two lens plates.

Further, each lens plate included in the uniform illumination optical element is constituted by a gradient index type cylindrical lens.

The projection display device of the present invention comprises an illumination device and
In a projection display device including a modulation unit that modulates a light beam from the illuminating device to include image information, and a projection optical system that projects and displays the modulated light beam on a screen, the illuminating device is A reflector for reflecting a light beam emitted from the light source lamp in one direction; and a uniform illumination optical element composed of two lens plates having a plurality of spherical lenses arranged in a plane. An aspherical lens is disposed between the uniform illumination optical element and the uniform illumination optical element, and a lens is disposed in the vicinity of the modulation means, and an image of the light flux exit surface of the illumination device is formed on the entrance pupil of the projection optical system. The feature is to make it image.

Further, a projection including an illuminating device, a modulation means for modulating a light beam from the illuminating device to contain image information, and a projection optical system for projecting and displaying the modulated light beam on a screen. In the type display device, the illumination device includes a light source lamp, a reflector that reflects a light beam emitted from the light source lamp in one direction, and a uniform illumination optical element including four lens plates in which a plurality of cylindrical lenses are arranged in a plane. An aspherical lens is disposed between the reflector and the uniform illumination optical element, and the lens is disposed in the vicinity of the modulation means, and the image of the light flux emission surface in the illumination device is projected by the projection device. It is characterized in that an image is formed on the entrance pupil of the optical system.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An illumination device and a projection type display device according to the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows the basic structure of the illuminating device of the present invention. The light source lamp 101 is a light source close to a point such as a halogen lamp, a metal halide lamp, and a xenon lamp, and the emitted light flux is reflected by the reflector 102 in one direction. The shape of the reflector 102 cannot be represented by a simple mathematical formula such as a parabola or an ellipse because the inclination of each portion in the cross section is continuously determined by calculation, and is approximated by a higher-order function. Can be represented. The reflected light flux then enters the aspherical lens 201, and the principal ray of the light flux incident on each part of the aspherical lens 201 is deflected in a direction parallel to the optical axis 203. The configuration after the aspherical lens 201 is almost the same as that of a normal integrator illumination system, but it will be briefly described below. First lens plate 103
Is configured by closely arranging a plurality of rectangular lenses, and the shape of each rectangular lens is similar to the rectangular shape of the illumination target 106. The light beam incident on the first lens plate 103 is divided for each rectangular lens, and each rectangular lens focuses each incident light beam on one point on the second lens plate 104, and as a result, the second lens plate. A plurality of light source images are formed on 104. The second lens plate 104 has a structure in which a plurality of lenses are closely arranged, and the center of each lens coincides with the center of the light source image formed on the second lens plate 104. Each lens included in the second lens plate 104 has such power as to form an image of the rectangular lens included in the corresponding first lens plate 103 at infinity. The auxiliary lens 105 has a focal length equal to the distance to the illumination target 106, and forms a rectangular image, which should be infinity, on the illumination target 106 arranged at a finite distance so as to exactly overlap. Therefore, each of the light fluxes divided into the plurality of rectangular shapes by the first lens plate 103 becomes the illumination target 106.
Since the image is superimposed and imaged on the original, the original non-uniform light flux is efficiently converted into a rectangular and uniform light flux. The field lens 202 is for adjusting the angle of the chief ray of the light beam incident on the illumination target 106. If the focal length is made equal to the distance to the auxiliary lens 105, the chief ray of the light beam incident on the illumination target 106. Is substantially parallel to the optical axis 203.

The shape of the reflector 102 and the shape of the aspherical lens 201, which are the most important in the present invention, are shown in FIG.
Will be described in detail. The angular range of the luminous flux used in the above-described integrator illumination system is determined by the configuration of the illumination system, and the utilization rate within a certain angle is 100%. Therefore, the angle is set to θ degrees, and the aspherical lens 201
The reflector 102 and the aspherical lens 201 are designed so that all the light fluxes that have passed through are at an angle within θ degrees with respect to the optical axis 203. First, the reflector 102 is designed so that the incident light flux on each point on the aspherical lens 201 is within ± θ degrees around the principal ray. Since the central part of the aspherical lens 201 is a plane perpendicular to the optical axis 203, the luminous flux incident on the central part is within a range of ± θ degrees with respect to the optical axis 203. Therefore, the curve inside the point c1 which is the intersection of the reflector 102 and the straight line drawn from the center of the aspherical lens at an angle of θ degrees is the point b which is one end of the light source 301 and the center point of the aspherical lens 201. It becomes an elliptic curve with two points of and as the focal points. Next, a light beam starting from point a, which is one end of the light source 301 on the reflector 102 side, is c
The point which is reflected at one point and hits the aspherical lens 201 is defined as point d. From this point d, the light source 301 appears as a reflected image outside the point c1 of the reflector 102. Therefore, the curve of the reflector 102 may be determined so that this reflected image can be seen within a range of 2θ degrees from the point d. That is, a straight line having an angle of 2θ with the line segment c1d is drawn from the point d, and the inclination of the reflector 102 at the intersection point c2 of the straight line and the curve continuously extended from the point c1 is such that the ray starting from the point b is c.
It may be designed so as to be reflected at two points and head toward the point d.
Actually, design the curve from c1 to c2 with a part of the circle,
A circle having a curvature that is smooth at one point and has the above-mentioned inclination at the point c2 may be determined by trial and error. The shape outside the point c2 is determined by repeating the same method as described above, and as a result, a reflector having a shape obtained by combining a part of a plurality of circles is obtained. Finally, the shape of the reflector 102 is approximated by a continuous high-order function, and the effect can be confirmed by simulation.

The reflector 10 thus determined
On the aspherical lens 201, the reflected light fluxes from No. 2 have the same angular range of the light fluxes incident on the respective points and have an angle of 2θ. However, since the direction of the principal ray of each light flux is not constant, the curved surface of the aspherical lens 201 causes the optical axis 203
Bend to be parallel to. As shown in FIG. 3A, the curved surface shape of the aspherical lens 201 is usually such that the central portion has positive power and the peripheral portion has negative power. Further, the aspherical lens 201 may have a shape in which the principal ray of the light flux of each portion is changed in a direction so as to intersect at one point on the optical axis 203.

Since the light flux passing through the system having such a reflector and aspherical lens has a uniform angular distribution, the light source image formed on the second lens plate of the integrator illumination system is shown in FIG. As shown in B), the sizes of the central light source image 302 and the peripheral light source image 303 are
The sizes are almost the same, and the optimum size fits within the inscribed circle of the rectangular lens. Therefore, there is no light amount loss in the central portion as in the conventional case, and the light source size in the peripheral area is larger than in the conventional case, so that the utilization efficiency of the luminous flux is dramatically increased.

The second lens plate 104 in FIG. 2 is shown in FIG.
As shown in (A) and FIG. 4 (B), it may be composed of hexagonal or rhombic lenses. In these cases, it is necessary to arrange each rectangular lens of the first lens plate in accordance with the arrangement of the second lens plate 104, and each rectangular lens is displaced from the positions of the upper and lower rectangular lenses by half to the left and right. It is arranged in a different configuration. As shown in FIG. 4A, when each lens of the second lens plate 104 is a hexagon, the size of the inscribed circle is increased as it is closer to a circle than a rectangle, and the light source image formed on each lens is enlarged. There is a merit that you can do it. When the aspect ratio of the rectangular lens of the first lens plate is 1: 3.5, the shape of each lens of the second lens plate 104 is a regular hexagon, which is most suitable. Further, also when the diamond-shaped lens as shown in FIG. 4B is used, the size of the inscribed circle is larger than that of the rectangular shape, and the efficiency is increased. When the aspect ratio of the rectangular lens of the first lens plate is 1: 2, the rhombus of the second lens plate 104 becomes a square, which is optimal.

FIG. 5A shows an example of the structure of the lighting device of the present invention. The basic configuration is the same as in the case of FIG. 2, but here the integrator composed of the first lens plate 103 and the second lens plate 104 in FIG. 2 is composed of a plurality of cylindrical lenses. Has become the lens plate. Four lens plates 501,502,503,50
4 can be divided into two groups in which the directions of the cylindrical lenses are the same, and the directions of the cylindrical lenses in each group are orthogonal to each other. In this example, the lens plates 501 and 503 and the lens plates 502 and 50
There are two sets of four. Therefore, the light flux passing through the four lens plates is orthogonal to each other in the plane perpendicular to the optical axis.
The two components are collected independently. This configuration has an advantage that the size of each lens can be made smaller than that in the case of using a normal spherical lens, and therefore the length of the integrator in the optical axis direction can be shortened. Also,
By replacing one of the lens plate sets with another lens plate set, there is an advantage that the aspect ratio of the rectangular illuminated portion can be easily changed. Figure 5
(B) is a structure in which four lens plates are integrated into two lens plates. The lens plate 505 and the lens plate 506 act as integrators for the light flux components orthogonal to each other. In addition, the lens plate 505 or the lens plate 506
If the cylindrical lenses formed on both surfaces of the lens are formed so that the directions thereof are orthogonal to each other, the lens plate 50
5 and the lens plate 506 can be formed in the same shape.

A lens plate having the same function as the lens plate shown in FIG. 5B can be formed by a gradient index lens. FIG. 6A is a diagram showing a method of manufacturing by an ion exchange method as an example. The glass substrate 601 containing low refractive index ions has a mask 6 with metal coating on both sides.
02 is formed and immersed in a solution salt containing ions that give a high refractive index. A region 6 having a refractive index distribution in the glass substrate 601 after ion exchange is performed from the opening of the mask 602.
03 is formed. If the opening portion of the mask 602 is formed in a rectangular shape, a rectangular lens that functions like a spherical lens is formed. Further, if the openings of the mask 602 are formed in stripes, a lens plate having the same function as a cylindrical lens is formed.

FIG. 6B shows an example of constructing an integrator illumination system using a gradient index lens plate formed by an ion exchange method. The light flux emitted from the light source lamp 101 is reflected by the optimally designed reflector 102 and enters the aspherical lens 604, as in the case of FIG. The aspherical lens 604 can be composed of a Fresnel lens. In an integrator composed of two lens plates 605 and 606 each having a stripe-shaped gradient index lens formed on both sides, the two lens plates have the same structure, and both are bonded together. The auxiliary lens 607 on the exit side is configured by a Fresnel lens here. If the integrator is composed of the lens plate by the ion exchange method as described above, not only the integrator can be made thin, but also the surface of the lens plate becomes flat, so that each optical element can be bonded. Therefore, alignment is easy,
The amount of light loss due to surface reflection can be minimized.

Next, the projection display device according to the present invention will be described in detail with reference to the drawings. An example of the structure of the projection display device of the present invention is shown in FIG. The light flux emitted from the light source device composed of the light source lamp 101 and the reflector 102 passes through the uniform illumination optical element 701 composed of the aspherical lens 201 and the integrator composed of the two lens plates 103 and 104 described above. Then, the light enters a color separation optical system 702 including a blue-green reflective dichroic mirror, a blue reflective dichroic mirror and a reflective mirror. White light (W) from the light source passes through the color separation optical system 702 and is separated into the three primary colors of RGB. The uniform illumination optical element 701 and the position where each color light exits the color separation optical system 702 have the same optical path distance. Next, the respective color lights are incident on the collimating lenses 703a, 703b, 703c, respectively, and the divergent light flux from the uniform illumination optical element 701 is collimated.
Red light (R) and blue light (B) in the collimated light flux
Are incident on and modulated by liquid crystal panels 705a and 705b placed immediately after the collimating lenses 703a and 703b, respectively, and image information corresponding to each color light is added. On the other hand, the green light (G) enters the liquid crystal panel 705c after being passed through the light transmitting means 704 including three lenses and two reflecting mirrors and is modulated. Liquid crystal panels 705a, 705b, 7
The respective color lights modulated by 05c then enter the cross dichroic mirror 706 which is a color combining means. Since the cross dichroic mirror 706 includes a green reflective dielectric multilayer film and a red reflective dielectric multilayer film in an X shape,
Blue light (B) is transmitted and red light (R) and green light (G) are reflected. Therefore, all the colored lights are combined into one, and the combined optical image is projected onto the screen 7 by the projection lens 707.
08 is projected and displayed. As the projection lens 707,
The one close to the telecentric system is used.

FIG. 7B is a diagram showing another configuration example of the projection type display device of the present invention. The light flux emitted from the light source lamp 101 is reflected by the reflector 102, enters the aspherical lens 201, and further enters an integrator composed of the first lens plate 103 and the two second lens plates 104. . Inside the integrator, a blue-green reflection dichroic mirror 709 is arranged at an angle of 45 degrees, and separates incident white light into red light (R) that transmits and blue light (B) and green light (G) that reflects. To do. The transmitted red light (R) is sequentially reflected by the reflecting mirrors 713, 714, 715, passes through the collimating lens 703c, and then the liquid crystal panel 705.
modulated by c. On the other hand, the reflected green light (G) is reflected by the reflecting mirror 710, is then reflected by the green reflecting dichroic mirror 711, is further reflected by the reflecting mirror 713, is incident on the collimating lens 703b, and is reflected by the liquid crystal panel 705b. Is modulated. The blue light (B) is reflected by the reflecting mirror 710, then passes through the green reflecting dichroic mirror 711, is further reflected by the reflecting mirror 712, and is collimated.
3a, and is modulated by the liquid crystal panel 705a. The modulated light beams enter the cross dichroic mirror 706 and are combined on the same optical axis. The combined light flux passes through the projection lens 707 and forms an image on the screen 708. FIG. 8 is a diagram showing another configuration example of the projection display device of the present invention. As in the case described above, the illumination system is an integrator illumination system including the optimally designed reflector 102 and aspherical lens 201. The white light (W) emitted from this illumination system is a red-green reflective dichroic mirror 80.
1 splits the reflected yellow light (G, R) and the transmitted blue light (B). The blue light is then reflected by the reflecting mirror 802, enters the collimating lens 703a, becomes a substantially parallel light flux, and is modulated by the liquid crystal panel 705a. On the other hand, yellow light is a red-reflecting dichroic mirror 80.
At 8, the reflected red light and the transmitted green light are separated, and the respective colored lights are incident on the collimating lenses 703b and 703c and further modulated by the liquid crystal panels 705b and 705c. The modulated blue light and red light are combined by the red-reflecting dichroic mirror 804 and enter the projection lens 807. Further, the modulated green light is reflected by the reflecting mirror 803 and enters the projection lens 807. Projection lens 807
Has two light beam incident portions, and lenses 805a and 805b are arranged at the respective incident portions. The light fluxes that have passed through the two incident portions are combined into one by the dichroic mirror 806, and further pass through the lens group of the emission portion. As the dichroic mirror 806, a dichroic mirror that transmits green light is used, and there are two types of configurations, a plate-shaped one and a prism-shaped one. The light flux that has passed through the projection lens 807 is imaged on the screen 708.

[0027]

As described above, according to the present invention, in the illuminating device using the integrator, the curved surface shape of the reflector that reflects the radiated light from the light source is optimally designed, and further the non-incidence side of the integrator is provided on the light incident side. By arranging the spherical lens, it is possible to increase the luminous flux that passes through the integrator and is incident on the illuminated portion as compared with the related art.
Further, since each light source image formed on the emitting portion of the integrator can be made uniform and have an optimum size, the apparent light source size seen from the illuminated portion can be reduced.

Further, the projection type display device of the present invention using this illumination system can realize bright and high-quality image because the efficiency of the illumination system is high. Further, since the apparent light source size is smaller than that of the conventional one, the diameter of the projection lens can be made small, which facilitates the design.

[Brief description of drawings]

FIG. 1A is a diagram showing a configuration of a conventional lighting device.
(B) is a figure which shows the apparent light source shape in the conventional illuminating device.

FIG. 2 is a diagram showing a basic configuration of a lighting device of the present invention.

FIG. 3A is a diagram showing a method of designing a reflector and an aspherical lens used in the illumination device of the present invention. (B) is a figure which shows the apparent light source shape in the illuminating device of this invention.

FIG. 4A is a diagram showing a configuration example of a lens plate used in the illumination device of the present invention. (B) is a figure which shows the other structural example of the lens plate used for the illuminating device of this invention.

FIG. 5A is a diagram showing a configuration example of a lighting device of the present invention. (B) is a figure which shows the structural example of the integrator used for the illuminating device of this invention.

FIG. 6A is a diagram showing a method for manufacturing a lens plate used in the lighting device of the present invention. FIG. 6B is a diagram showing a configuration example of a lighting device of the present invention.

FIG. 7A is a diagram showing another configuration example of the projection display device of the present invention. FIG. 6B is a diagram showing another configuration example of the projection display device of the present invention.

FIG. 8 is a diagram showing another configuration example of the projection display device of the present invention.

[Explanation of symbols]

 101 light source lamp 102 reflectors 103 and 104 lens plate 106 illumination target 201 aspherical lens 202 field lens 601 glass substrate 602 mask 603 refractive index distribution region 705 liquid crystal panel 706 cross dichroic mirror 707 projection lens 708 screen

Claims (9)

[Claims] 1. A structure including a light source lamp, a reflector that reflects a light beam emitted from the light source lamp in one direction, and a uniform illumination optical element having two lens plates on which a plurality of spherical lenses are arranged in a plane. In the illumination device described above, an aspherical lens is arranged between the reflector and the uniform illumination optical element. 2. The uniform illumination optical element includes a first lens plate having a plurality of rectangular lenses arranged in a plane without a gap, and a rectangular lens having the same number as the rectangular lenses included in the first lens plate without a gap. The lighting device according to claim 1, wherein the lighting device comprises a second lens plate arranged in a plane. 3. The uniform illumination optical element includes a first lens plate in which a plurality of rectangular lenses are arranged in a plane without a gap, and hexagonal lenses in the same number as the rectangular lenses included in the first lens plate. The illumination device according to claim 1, wherein the illumination device is configured with a second lens plate arranged in a plane without a gap. 4. The uniform illumination optical element includes a first lens plate having a plurality of rectangular lenses arranged in a plane without a gap, and a diamond lens having the same number as the rectangular lenses included in the first lens plate. The illuminating device according to claim 1, wherein the illuminating device is configured by a second lens plate arranged in a plane instead of the second lens plate. 5. A light source lamp, a reflector that reflects a light beam emitted from the light source lamp in one direction, and a uniform illumination optical element including four lens plates on which a plurality of cylindrical lenses are arranged in a plane. The illuminating device, wherein an aspherical lens is arranged between the reflector and the uniform illuminating optical element. 6. The illumination device according to claim 5, wherein two of the four lens plates forming the uniform illumination optical element are integrated to form two lens plates. 7. The illumination device according to claim 5, wherein each lens plate included in the uniform illumination optical element is formed of a gradient index cylindrical lens. 8. A projection comprising an illuminating device, a modulation means for modulating a light beam from the illuminating device to contain image information, and a projection optical system for projecting and displaying the modulated light beam on a screen. In the display device, the lighting device includes
The reflector includes a light source lamp, a reflector that reflects a light beam emitted from the light source lamp in one direction, and a uniform illumination optical element including two lens plates on which a plurality of spherical lenses are arranged in a plane. An aspherical lens is arranged between the uniform illumination optical elements, a lens is arranged in the vicinity of the modulation means, and an image of the light flux exit surface of the illumination device is formed on the entrance pupil of the projection optical system. A projection type display device characterized by: 9. A projection comprising an illuminating device, a modulating means for modulating a luminous flux from the illuminating device to contain image information, and a projection optical system for projecting and displaying the modulated luminous flux on a screen. In the display device, the lighting device includes
The reflector includes the light source lamp, a reflector that reflects a light beam emitted from the light source lamp in one direction, and a uniform illumination optical element including four lens plates in which a plurality of cylindrical lenses are arranged in a plane. An aspherical lens is disposed between the illumination optical elements, the lens is disposed in the vicinity of the modulation means, and the image of the light flux exit surface of the illumination device is formed on the entrance pupil of the projection optical system. A projection display device characterized by: