JPH11281930A - Projection display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a device compact and to obtain a bright projected picture by using a small-sized display element. SOLUTION: This device is provided with a lamp 1 which generates parallel rays of a luminous flux, a reflection mirror 2 which reflects the luminous flux generated by the lamp 1, a polarization separating element 41 which separates the luminous flux converged by the reflection mirror 2 into two linearly polarized light, a polarization reflecting element 42 which reflects one of these separated linearly polarized light, a polarization conversion element 5 which rotates the vibration plane of the reflected linearly polarized light, a display element 9 which displays a picture from polarized light by electric modulation, a lens group 15 which forms images of exit end faces of a polarization separating means 4a and a polarization reflecting means 4b on the display element 9, and a projection lens 10 which enlarges and projects the picture of the display element 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection display device such as a liquid crystal projector for enlarging and projecting an image formed by a small display element.

[0002]

2. Description of the Related Art FIG. 9 shows an optical system of a liquid crystal projector as an example of a conventional projection display device.

In FIG. 9, a light beam from a lamp 1 is reflected by a reflecting mirror 2 to become a parallel light beam 3. In the first dichroic mirror 50, red light of the parallel light flux 3 is transmitted, and blue-green light is reflected at an angle of about 90 °.
The transmitted red light has its optical path bent by the reflection mirror 52 and illuminates the liquid crystal panel 9R. The blue-green light reflected by the first dichroic mirror 50 is incident on the second dichroic mirror 51, where the green light is reflected at an angle of about 90 ° and the blue light is transmitted. The green light reflected by the second dichroic mirror 51 illuminates the liquid crystal panel 9G. The blue light transmitted through the second dichroic mirror 51 is reflected by the reflection mirrors 53 and 5.
The light path is bent by 4 to illuminate the liquid crystal panel 9 '.

[0004] The liquid crystal panel 9R forms an image which is electrically modulated by a red image signal. As a result, of the light selectively transmitted or shielded by the liquid crystal panel 9R, only the transmitted light is the dichroic prism 5
5, the light path is bent by the reflection surface 55R, and then enters the projection lens 10. The light transmitted through the liquid crystal panel 9G modulated by the green video signal similarly enters the dichroic prism 55 and directly enters the projection lens 10. The light incident on the liquid crystal panel 9 # similarly enters the dichroic prism 55, and the optical path is bent by the reflection surface 55 # in the same manner.
Incident on. Thus, the red, green, and blue lights from the dichroic prism 55 are combined, enter the projection lens 10, and are enlarged and projected on the screen 11 as a full-color image.

[0005]

In the conventional projection display device, since three liquid crystal panels 9R, 9G and 9B are used as display elements, there is a problem that the scale of the entire optical system becomes large. .

The liquid crystal panels 9R, 9G and 9B are used in combination with dichroic mirrors 50 to 53.
Since the image is displayed by transmitting or absorbing the linearly polarized light by utilizing the optical rotation of the liquid crystal, the liquid crystal panel 9
Only half of the light incident on R, 9G, 9B is used as image light.

Further, the parallel light beam 3 is blocked by the presence of the lamp 1 itself, or defined by the shape of the insertion opening of the lamp 1 provided in the reflecting mirror 2, and the three liquid crystal panels 9R, 9
It was difficult to uniformly illuminate G and 9B, respectively. For this reason, the image projected on the screen 11 has uneven illuminance or uneven color.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a projection display device capable of reducing the size of an optical system, improving light use efficiency, reducing uneven illuminance, and the like. With the goal.

[0009]

SUMMARY OF THE INVENTION A projection display apparatus according to the present invention is a projection display apparatus for enlarging and projecting an image formed by electric modulation from polarized light on a screen. Polarization separating means for separating a light beam into two linearly polarized lights, polarized light reflecting means for reflecting one of the linearly polarized lights separated by the polarized light separating means, and polarization conversion for rotating the vibration plane of the linearly polarized light reflected by the polarized light reflecting means Means, an output end face of the other linearly polarized light separated by the polarization splitting means, and a lens group for imaging light emitted from the output end face of the polarization reflection means on the same image forming surface, and an electric modulation device arranged on the image forming surface And a projection lens for enlarging and projecting the image of the display element.

The parallel light beam generating means includes a light source for generating light having a random polarization direction, and a reflecting means for reflecting the light beam from the light source into a substantially parallel light beam.

[0011] The output end face of the polarized light separating means and the output end face of the polarized light reflecting means each have a shape similar to the shape of the display element.

Further, the polarization conversion means is attached to either the emission end face of the polarization separation means or the emission end face of the polarization reflection means.

[0013] At least one of the polarized light separating means and the polarized light reflecting means has a convex lens having a predetermined curvature on its exit end face.

Further, the polarized light reflecting means is constituted by a reflecting mirror for reflecting one linearly polarized light.

Further, the polarized light reflecting means is arranged to be separated by a predetermined distance from one linearly polarized light exit end face of the polarized light separating means.

Further, the display element is a reflection type liquid crystal panel.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described.

Embodiment 1 FIG. 1 is a diagram showing an optical system in a projection display apparatus according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing a state of polarized light in the optical system of the projection display device.

In the first embodiment, a light beam emitted from a lamp 1 as a light source is incident on a polarization splitting element 41 as a substantially parallel light beam 3 by a parabolic reflecting mirror 2. A dielectric multilayer film 41 a is disposed on the polarization splitting element 41 at an angle of 45 ° with respect to the parallel light flux 3, and the light beam incident on the polarization splitting element 41 is separated from the dielectric multilayer film 41 in the polarization splitting element 41. The light is separated into two linearly polarized lights by 41a. Hereinafter, light reflected by the dielectric multilayer film 41a is referred to as S-polarized light, and transmitted light is referred to as P-polarized light.

The S-polarized light is converted to 90 by the dielectric multilayer film 41a.
By being reflected at an angle of °, the traveling direction is bent upward in FIG. After transmitting the P-polarized light, the P-polarized light is incident on a triangular prism-shaped polarization reflection element 42 that is adhered to the polarization separation element 41 and then transmitted. The luminous flux incident on the polarization reflection element 42 is 4
The light is totally reflected by the inclined surface 42a forming an angle of 5 °, and its optical path is bent upward in FIG.

A polarization conversion element 5 for rotating the plane of oscillation of the linearly polarized light by 90 degrees is disposed on the emission end face side of the polarization reflection element 42. As the polarization conversion element 5, for example, a retardation plate having a function of converting P-polarized light into S-polarized light is used.
Therefore, in the optical element arranged in the optical path after the polarization conversion element 5, all the vibration planes of the light beam incident thereon are aligned with the S-polarized light.

The light that has passed through the output end face of the polarization separation element 41 and the polarization conversion element 5 is incident on a display element 9 such as a liquid crystal panel via a lens group 15 and a mirror 8 for bending the optical path. . Here, the lens group 15 includes single lenses 61, 62, and 7. Each of the single lenses 61 and 62 has its focal length set to be substantially equal to the distance to the single lens 7, so that light emitted from the exit end faces of the polarization separation element 41 and the polarization reflection element 42 is efficiently taken into the single lens 7. Can be. The single lens 7 is set so that its focal length is substantially equal to the distance to the display element 9, and has a function of superimposing the images of the exit end faces of the polarization separation element 41 and the polarization reflection element 42 on the same display element 9. doing.

As described above, the lens group 15 is configured such that the exit end faces of the polarization splitting element 41 and the polarization reflection element 42 have a conjugate relationship with the display element 9. The display element 9 can be uniformly illuminated by an integrator optical system using two rectangular light sources on the emission end face of the reflection element 42. Here, the integrator optical system divides the luminous flux from the light source into a plurality of light source images, and then forms a superimposed image on one illumination area, thereby improving the efficiency of use of the light source light. In addition, the light intensity distribution can be made uniform.

The light beam transmitted through the display element 9 enters the projection lens 10 and is further enlarged and projected on the screen 11. Here, the display element 9 has a configuration in which a color filter is attached to each pixel, and a full-color image can be displayed on the screen 11 with one liquid crystal panel.

Next, the state of polarized light in the optical system of the projection display device will be described in detail. In FIG. 2, the polarization splitting element 41, the polarization reflection element 42, and the polarization conversion element 5 are extracted and illustrated to explain the state of polarized light.

Here, as shown in FIG. 2, coordinate axes Χ, Y,
When Z is taken, the parallel light beam 3 has a linearly polarized light 20 s having a vibration plane in the Y 内 plane and a linearly polarized light 2 having a vibration plane in the XΖ plane.
0p. The dielectric multilayer film 41a has a configuration in which a material having a high refractive index and a material having a low refractive index are alternately laminated,
It is designed to efficiently reflect S-polarized light and transmit P-polarized light using the Brewster angle (a condition under which the sum of the incident angle and the refraction angle of the light beam entering the interface is 90 degrees). Therefore, the parallel light beam 3 incident on the polarization separation element 41 is
Are separated into S-polarized light 20s and P-polarized light 20p in the dielectric multilayer film 41a.

The separated S-polarized light exits from the exit end face of the polarization splitting element 41 while maintaining the polarization, and the P-polarized light enters the polarization reflecting element 42. The P-polarized light that has entered the polarization reflection element 42 is totally reflected by the inclined surface 42a and exits from the exit end face of the polarization reflection element 42 while maintaining the polarization. In order to prevent the loss due to the reflection of the incident light beam on the polarization reflection element 42,
The refractive index of the glass material forming the polarization reflection element 42 is selected in consideration of the angle of the incident light beam, or the slope 42a is subjected to vapor deposition of aluminum or the like.

The light beam emitted from the polarization reflection element 42 enters the polarization conversion element 5. The polarization conversion element 5 has an optical axis 23 in a direction inclined by 45 ° with respect to the incident P-polarized light 20p.
And converts the P-polarized light 20p into the S-polarized light 21s in the configuration of FIG.

In the projection type display apparatus according to Embodiment 1 of the present invention, since the planes of polarization of the polarized light are aligned in the optical system, the utilization efficiency of light is high and a bright projection screen can be obtained. In addition, since the simple integrator illumination is performed so that the video light of the two emission end faces of the polarization separation element 41 and the polarization reflection element 42 are superimposed on the display element 9,
It is possible to make the angle θ of the light beam incident on the display element 9 relatively small. Therefore, the F number of the projection lens can be increased, and the size of the projection lens can be reduced. Further, since the angle θ of the light beam incident on the display element 9 is small, the dependence of the transmittance of the liquid crystal panel on the incident angle is reduced, and the illuminance unevenness of the projected image can be reduced.

Embodiment 2 FIG. Embodiment 2 of the present invention will be further described based on the above-described perspective view showing the polarization state of FIG.

The video signal supplied to the projection display device is
The display aspect ratio varies depending on the application. Therefore, for example, a screen having a 4: 3 aspect ratio like a current television screen or a 16: 9 screen corresponding to a wide screen is used as a screen for displaying a video signal. Further, in order to display an image of a computer, it is necessary to use 4: 3 or 5: 4 according to the number of pixels of the display screen.
Such as those having an aspect ratio of, for example, are used.

In the projection display device of the second embodiment,
By setting the horizontal and vertical dimensional ratios (x: y) of the emission end face of the polarization conversion element 41 and the emission end face of the polarization reflection element 42 in accordance with the shape (aspect ratio) of the display element 9, Only the nine display areas can be efficiently illuminated. That is, it is possible to realize a small-sized, bright projection type display device in which loss of light emitted from the lamp 1 is small.

Embodiment 3 Next, a third embodiment of the present invention will be described. FIG. 3 is a perspective view showing the state of polarization in the optical system of the projection display device, similarly to FIG. 2, in which a polarization separation element 41 and a polarization reflection element 42 are illustrated.

In the projection display device of the third embodiment,
The configuration is such that the polarization conversion element 5 is attached to the output end face of the polarization reflection element 42. In particular, if the polarization conversion element 5 is bonded using an adhesive having a higher refractive index than air, there is no space between the output end face of the polarization reflection element 42 and the incidence face of the polarization conversion element 5, and each surface has Can be reduced at the interface.
As described above, in the projection display device according to the third embodiment, the loss due to interface reflection is reduced as compared with the configuration of the second embodiment in which the polarization conversion element 5 is disposed away from the emission end face of the polarization reflection element 42. Therefore, light loss of the entire optical system can be suppressed.

Embodiment 4 FIG. Next, a fourth embodiment of the present invention will be described. FIG. 4 is a diagram showing a part of the optical system of the projection display device, and shows only the polarization separation element 41, the polarization reflection element 42, and the optical systems before and after it.

In the fourth embodiment, the polarization separation element 41
The shape of the exit end face of the polarization reflection element 42 forms convex lenses 41b and 42b having a predetermined curvature, respectively. The light emitted from the emission end faces of the polarization separation element 41 and the polarization reflection element 42 is condensed while being condensed.
Since the light enters the lens 62, the light can efficiently pass through the lenses 61 and 62.

Here, in order to transmit the light flux most efficiently, the focal length of the convex lenses 41b and 42b should be
What is necessary is just to determine so that it may become equal to the distance to 1,62. Alternatively, for a lamp 1 having a finite size,
The shape of the convex lenses 41b and 42b may be selected so that the image of the light emitting point is formed most clearly on the lenses 61 and 62.

The convex lenses 41b and 42b can be formed by directly polishing a glass block.
The same function can be realized by bonding the light-emitting element 2 to the emission end face. Furthermore, by bonding the polarization conversion element 5 between the exit end face of the polarization reflection element 42 and the plane of the plano-convex lens so that the polarization conversion element 5 is interposed therebetween, loss of light due to interface reflection can be reduced as in the third embodiment. Can be suppressed.

It is to be noted that only one of the exit end faces of the polarization splitting element 41 and the polarization reflecting element 42 may be formed in a convex lens shape.

Embodiment 5 Next, a fifth embodiment of the present invention will be described. FIG. 5 is a perspective view showing the state of polarized light in the optical system of the projection display device, and shows only the polarization splitting element 41, the reflection mirror 43, and the optical systems before and after it.

In the fifth embodiment, the polarization reflection element is constituted by a reflection mirror 43 which forms an angle of 45 ° with the parallel light beam 3. Thereby, the weight and cost of the optical system can be reduced.

Embodiment 6 FIG. Next, a sixth embodiment of the present invention will be described. FIG. 6 is a perspective view showing the state of polarized light in the optical system of the projection display device, and shows only the polarization splitting element 41, the polarization reflection element 42, and the optical systems before and after it.

As shown in FIG. 1, the luminous flux emitted from the lamp 1 is converted into substantially parallel light 3 by the parabolic reflecting mirror 2. However, since the lamp itself has a finite size, it is polarized. Light incident on the separation element 41 is not completely a parallel light beam. Further, there is an influence of a hole provided in the reflecting mirror 2 for inserting the lamp 1 and a shadow of the lamp 1 itself. For this reason,
The light beam 3 reflected by the parabolic reflector 2 has a different illuminance distribution depending on the distance from the light source.

Therefore, in the apparatus according to the sixth embodiment, as shown in FIG. 6, the polarization splitting element 41 and the polarization reflection element 42 are arranged separately. The distance between the two may be determined based on how light is blocked by the lamp 1 itself or the reflecting mirror 2.

That is, in the sixth embodiment, the interval between the polarized light separating element 41 and the polarized light reflecting element 42 is set such that the illuminance distribution on each of the exit end faces is optimized. Thereby, the illuminance distribution of the image superimposed on the display element 9 can be made uniform, and the influence of the lamp 1 and the reflecting mirror 2 on the image light can be reduced.

Embodiment 7 FIG. FIG. 7 is a diagram showing an optical system in a projection display apparatus according to Embodiment 7 of the present invention. In Embodiment 7 of the present invention, a reflective liquid crystal panel 91 is used for a display element.

A light beam emitted from a lamp 1 as a light source is converted into a substantially parallel light beam 3 by a parabolic reflecting mirror 2 and is incident on a polarization splitting element 41. The light beam incident on the polarization splitting element 41 is split by the dielectric multilayer film 41a of the polarization splitting element 41 into two linearly polarized lights whose vibration planes are orthogonal to each other. The S-polarized light is reflected by the dielectric multilayer film 41a, and its traveling direction is bent upward in FIG. After transmitting the P-polarized light, the P-polarized light is incident on a triangular prism-shaped polarization reflection element 42 that is adhered to the polarization separation element 41 and then transmitted. Light that has entered the polarization reflection element 42 is totally reflected by the inclined surface 42a, and its optical path is bent upward in the figure.

A polarization conversion element 5 for rotating the plane of oscillation of the linearly polarized light by 90 degrees is disposed on the emission end face side of the polarization reflection element 42. As the polarization conversion element 5, for example, a retardation plate having a function of converting P-polarized light into S-polarized light is used.

The light that has passed through the exit end face of the polarization splitting element 41 and the polarization conversion element 5 enters the liquid crystal panel 91 via the lens group 15 and the polarization splitting element 81. The light beam incident on the polarization separation element 81 is separated into two linearly polarized lights by the dielectric multilayer film 81a having the same function as the dielectric multilayer film 41a, reflects S-polarized light, and transmits P-polarized light.

The S-polarized light reflected by the dielectric multilayer film 81a illuminates the reflective liquid crystal panel 91. The reflection type liquid crystal panel has a function of rotating the vibrating plane of the linearly polarized light that has been selectively incident according to the video signal by 90 degrees. , ΟF
F reflects S-polarized light.

Therefore, the P-polarized light reflected by the reflection type liquid crystal panel 91 is transmitted through the dielectric multilayer film 81a and enters the projection lens 10 to be enlarged and projected on the screen 11. The S-polarized light reflected by the reflective liquid crystal panel 91 is reflected by the dielectric multilayer film 81a and returned to the direction of the lens group 15.

Here, the lens group 15 is
1. Since the radius of curvature and the arrangement are determined so that the emission end face of the polarization reflection element 42 is in a conjugate relationship with the liquid crystal panel 91, the liquid crystal panel 91 can be uniformly rectangularly illuminated.

According to such an optical system, simple integrator illumination is performed so that the video light from the two emission end faces of the polarization splitting element 41 and the polarization reflecting element 42 are superimposed on the liquid crystal panel 91. It is possible to make the angle θ of the light beam incident on the liquid crystal panel 91 relatively small.
Therefore, the F number of the illumination system and the projection lens can be made large, and the polarization separation element 81 and the projection lens 10 can be used.
Can be reduced in size.

Embodiment 8 FIG. FIG. 8 is a diagram showing an optical system in a projection display apparatus according to Embodiment 8 of the present invention. Embodiment 8 of the present invention also uses a reflective liquid crystal panel 92 as a display element.

In the projection display device of the eighth embodiment, the polarization conversion element 5 is arranged on the emission end face side of the polarization separation element 41, and the light beam incident on the lens group 15 is aligned to P-polarized light. The P-polarized light passes through the dielectric multilayer film 82a of the polarization splitter 82 and illuminates the reflective liquid crystal panel 92. The reflection type liquid crystal panel 92 has a function of rotating the plane of vibration of the linearly polarized light that is selectively incident according to the video signal by 90 degrees.
Contrary to liquid crystal panel 91 of the seventh embodiment, video signal 0N
Reflects S-polarized light and ΔFF reflects P-polarized light. Therefore, the S-polarized light reflected by the reflection type liquid crystal panel 92 is reflected by the dielectric multilayer film 82a and enters the projection lens 10 to be enlarged and projected on the screen 11. The P-polarized light reflected by the reflective liquid crystal panel 92 is applied to the dielectric multilayer film 82a.
And is returned in the direction of the lens group 15.

The polarized light separating element 41 and the polarized light reflecting element 4
2 and whether the linearly polarized light generated by the polarization conversion element 5 is P-polarized light as described in Embodiment 7 or S-polarized light as described in Embodiment 8, 1
What is necessary is just to determine in consideration of the characteristic of the optical component arrange | positioned after 5th.

[0057]

According to the projection display device of the present invention, a light beam having a uniform plane of vibration of polarized light is generated by using a combination of a polarization separation means, a polarization reflection means and a polarization conversion means. It is possible to significantly improve the light use efficiency and obtain a bright projection screen.

Further, since the polarization direction of the light can be adjusted at the same time as the polarization vibration plane can be adjusted, the arrangement space of the optical system can be reduced.

Further, since a simple integrator illumination for forming an image of the exit end face of the polarization separation means and the polarization reflection means on the liquid crystal panel is performed, it is possible to obtain a projection screen of uniform brightness with little illuminance unevenness.

Furthermore, since the integrator illumination has a simple configuration, the angle of the light beam incident on the display element can be reduced, and the illumination optical system and the projection lens can be reduced.

Further, in the projection type display device according to the fourth aspect, by attaching the polarization conversion means to the polarization reflection means, it is possible to reduce light loss due to interface reflection.

Further, in the projection type display device according to the fifth aspect, the transmission efficiency of the light incident on the lens group can be improved by giving the exit surfaces of the polarization separating means and the polarization reflecting means a curvature.

Further, in the projection type display device according to the sixth aspect, the optical system can be configured at low cost and light weight by forming the polarization reflection means with a reflection mirror.

Further, in the projection type display device according to the seventh aspect, by disposing the polarized light separating means and the polarized light reflecting means separately, illuminance unevenness caused by the light source is eliminated and a projection screen of uniform brightness is obtained. Becomes possible. Further, it is possible to arbitrarily control the illuminance distribution in the projection screen according to the specification.

Further, in the projection type display device of the present invention, by adopting an optical system using a reflection type liquid crystal panel, it is possible to reduce the size of the optical system and obtain a projection screen with uniform brightness. Become. Further, since the angle of the light beam incident on the polarization splitting means disposed in front of the reflection type liquid crystal panel is small, it is possible to suppress the characteristic fluctuation depending on the light incident angle of the polarization splitting means.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a state of polarized light according to the present invention.

FIG. 3 is a diagram illustrating a third embodiment of the present invention.

FIG. 4 is a diagram illustrating a fourth embodiment of the present invention.

FIG. 5 is a diagram for explaining a fifth embodiment of the present invention.

FIG. 6 is a diagram illustrating a sixth embodiment of the present invention.

FIG. 7 is a diagram for explaining a seventh embodiment of the present invention.

FIG. 8 is a diagram illustrating Embodiment 8 of the present invention.

FIG. 9 is a diagram showing a configuration of an optical system of a conventional liquid crystal projector.

[Explanation of symbols]

1 lamp (light source), 2 reflecting mirror, 41 polarized light separating element, 42 polarized light reflecting element, 5 polarization converting element,
9 display element (liquid crystal panel), 10 projection lens,
11 screen, 50,51 dichroic mirror, 55 dichroic prism.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Kida 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Co., Ltd. (72) Inventor Akira Ohuedo 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation

Claims (8)

[Claims] 1. A projection display device for enlarging and projecting an image formed by electric modulation from polarized light on a screen, a parallel light beam generating means for generating a parallel light beam, and a polarized light for separating the parallel light beam into two linearly polarized lights. A separating unit, a polarized light reflecting unit that reflects one of the linearly polarized lights separated by the polarized light separating unit, a polarization converting unit that rotates a vibration plane of the linearly polarized light reflected by the polarized light reflecting unit, and the polarization separating unit. An output end face of the other separated linearly polarized light, and a lens group that forms light emitted from the output end face of the polarized light reflecting means on the same image forming surface, and is arranged on the image forming surface to form an image by electrical modulation. A projection display device, comprising: a display element; and a projection lens for enlarging and projecting an image of the display element. 2. The projection system according to claim 1, wherein said parallel light beam generating means includes a light source for generating light having a random polarization direction, and a reflecting means for reflecting the light beam from said light source to substantially parallel light beams. Type display device. 3. The projection type according to claim 1, wherein an emission end face of the polarization splitting means and an emission end face of the polarization reflection means have shapes similar to the shape of the display element. Display device. 4. The apparatus according to claim 1, wherein said polarization conversion means is attached to one of an emission end face of said polarization separation means and an emission end face of said polarization reflection means. The projection type display device according to the above. 5. The light-emitting device according to claim 1, wherein at least one of the polarized light separating means and the polarized light reflecting means includes a convex lens having a predetermined curvature on an emission end face thereof. Projection display device. 6. The projection type display device according to claim 1, wherein said polarization reflection means is constituted by a reflection mirror for reflecting said one linearly polarized light. 7. The apparatus according to claim 1, wherein the polarized light reflecting means is disposed at a predetermined distance from the one linearly polarized light exit end face of the polarized light separating means. The projection type display device according to the above. 8. The projection display device according to claim 1, wherein the display element is a reflection type liquid crystal panel.