JPH03191318A - Polarlizing and illuminating device and projection type display device provided therewith - Google Patents

Abstract

PURPOSE:To improve utilization efficiently of light by emitting either the P polarized light component or the S polarized light component of an incident luminous flux separated by a polarizing beam splitter and the other component whose plane of polarization is rotated by 90 deg. with the aid of a lambda/4 optical phase plate and a reflecting member. CONSTITUTION:The P polarized light component Lp of the collimated luminous flux emitted from a condenser lens 24 is transmitted through the action surface 26a of the polarizing beam splitter 26 and the S polarized light component Ls thereof is reflected at right angle on the surface 26a, so that the P polarized light component is separated from the S polarized light component. The S polarized light component Ls is made incident on the lambda/4 optical phase plate 27, reflected on the reflection surface of the reflector 28 and transmitted through the lambda/4 optical phase plate 27 again, so that the plane of polarization thereof is rotated by 90 deg. and converted to the P polarized light component Lp. Then, the P polarized light component Lp is transmitted through the action surface 26a as it is and emitted from the beam splitter 26. On the other hand, the transmitted P polarized light component Lp is reflected at right angle on the total reflection surface 29a of a total reflection prism 29 and emitted from the prism 29 in parallel with the converted P polarized light component Lp. Thus, the utilization efficiency of light is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a polarized illumination device and a projection display device having the polarized illumination device.

(Prior Art) FIG. 8 is a diagram illustrating a main part of a conventional example of this type of projection display device.

This projection display device includes a light source 1 made of a halogen lamp, a metal halide lamp, etc., a reflecting mirror 2 that reflects a part of the luminous flux emitted from the light source 1, and a light beam that is incident directly from the light source 1 or via the reflecting mirror 2. A heat ray cut filter 3 that absorbs or reflects the heat rays of the light beam, and a condenser lens 4 that converts the light beam from which the heat rays have been removed into a parallel light beam.
, a polarizing plate 5 that converts the parallel light flux into linearly polarized light, a liquid crystal light valve 7 that modulates the linearly polarized light according to an image signal, and a component of the modulated linearly polarized light in the transmission axis direction. a polarizing plate 8 that transmits only the linearly polarized light, and a projection lens 10 that magnifies and projects the transmitted linearly polarized light onto a screen (not shown).
and has.

FIG. 9 is a diagram showing the main part of another conventional example of this type of projection display device.

This projection display device has two polarizing beam splitters 6.9 arranged before and after the liquid crystal light valve 7, in place of the two polarizing plates 5.8 of the projection display device shown in FIG. be.

The projection type display device shown in FIGS. 8 and 9 includes a polarizing plate 5. Polarizing beam splitter 6
Only the linearly polarized light component that passes through is used as illumination light for the liquid crystal light valve 7, and the linearly polarized light component orthogonal to the linearly polarized light component is lost, so there is a drawback that the light utilization efficiency is less than 50%.

As a projection type display device that has improved this drawback, Japanese Patent Application Laid-Open No. 61-1999, shown in FIG. There is one described in JP-90584.

In this projection display device, the parallel light beam emitted from the condenser lens 4 enters the polarizing beam splitter 11,
Working surface 11a of polarizing beam splitter 11 (deposited film formed on the slope where two right-angled prisms are bonded to each other)
The P-polarized light component is transmitted as is, and the S-polarized light component is reflected at right angles and enters the total reflection prism 12. The S-polarized light component Lx is reflected again at a right angle by the total reflection prism 12, and is emitted from the total reflection prism 12 in the same direction as the P-polarized light component Lp that passes through the polarization beam splitter 11. Here, the S-polarized light component refers to a polarized light component parallel to the working surface 11a of the polarization beam splitter 11, and the P-polarized light component LP refers to a polarized light component orthogonal to the S-polarized light component.

13 is disposed, and when the light is emitted from the total reflection prism 12, its polarization direction is rotated by 90'' and converted into a P-polarized light component Lp''. Further, a wedge-shaped lens 14.15 for changing the optical path of the polarizing beam splitter is disposed, and the P polarized light component Lp'' transmitted through the polarizing beam splitter 11 and returned.
The optical path of the light beams is changed, and the light beams intersect at a point P0 on the incident side surface of the liquid crystal light valve 7 to become combined light.

Therefore, in this projection display device, the liquid crystal light valve 7 can be illuminated with both the S-polarized light component and the P-polarized light component separated by the polarization beam splitter 11. The light usage efficiency can be doubled compared to the projection type display device shown in FIG.

[Problem to be solved by the invention] Phase plate 1 described in the above-mentioned Japanese Patent Application Laid-Open No. 61-90584
In order to make the P polarized light component Lp'' converted in step 3 incident on the liquid crystal light valve 7 at the angle θ shown in FIG. The drawback is that the distance from the lens 14, 15 to the liquid crystal light valve 7 must be quite large and the angle of incidence must be small.

As a method to improve this drawback, the wedge-shaped lens 14.15 shown in FIG. A parallel lighting method is considered. However, this parallel lighting method was
Even if applied to the projection display device described in the publication, the parallel light beam emitted from the condenser lens 4 is not perfect unless the light source 1 is a perfect point light source or a line light source.
the P-polarized light component L+- and the converted P-polarized light component;
” is not perfect and problems arise.

This will be explained using FIG. 11.

A light beam emitted from a light source l having a finite diameter φ is focused by a condenser lens 4 placed at a distance β, but the light emitted from the condenser lens 4 is not a perfectly parallel beam, and is reflected at an angle 2ω(ω =tan"'((')/ρ))
It becomes a non-parallel beam of light that spreads over the range of . [Means for Solving the Problem] The polarized illumination device of the present invention includes a polarizing beam splitter that separates the incident light beam into a first P-polarized light component and a first S-polarized light component. , the first P-polarized light component or the first S-polarized light component is incident, and the polarized light beam is emitted while containing both the S-polarized light component and the P-polarized light component. The light beam β becomes the S-polarized light component L8 at the polarizing beam splitter 11, but after being reflected at the total reflection prism 12, it is reflected again at the polarizing beam splitter 11 and is emitted from the metal plate 13 as shown by the light source β. Otherwise, as shown in FIG. 11, the light ray β2 is transmitted as it is, resulting in lost light.

An object of the present invention is to provide a polarized illumination device that allows light emitted from a light source to enter a light valve without loss, and a projection display device that includes the polarized illumination device.

a first P-polarized plate, the first P-polarized light component is converted into a second S-polarized light component or a second P-polarized light component by the reflective member;

A second P-polarized light component, a first S-polarized light component, and a second S-polarized light component are emitted.

a polarizing beam splitter having a working surface that transmits the P-polarized component of the incident light beam and reflects the S-polarized component of the incident light beam at right angles; a reflecting member that reflects the transmitted P-polarized light component at right angles; and a reflecting plate, one end of which is in contact with one end of the working surface of the polarizing beam splitter at an angle of 45° and with one end of the reflecting surface of the reflecting member. and may convert the reflected S-polarized light component into the reflected S-polarized light component, and emit the converted P-polarized light component and the transmitted P-polarized light component.

Furthermore, a first . a polarizing beam splitter having a second working surface; and a reflective surface having one end touching the other end of the second working surface at an angle of 45 degrees to each other and a reflective surface bonded to a return-input side plate of the polarizing beam splitter. the S-polarized light component is reflected at right angles on the second working surface; the S-polarized light component is reflected at right angles on the first working surface; The light may be reflected and emitted.

A light valve type projection display device of the present invention has the above polarized illumination device.

Further, the third polarized light illumination device, a cross dichroic prism whose negative surface is bonded to the output surface of the polarized light illumination device, and red, green, and red light, which are bonded to the other three surfaces of the cross dichroic prism, respectively, It may include a reflective light valve for blue and a projection lens provided on the opposite side of the output surface of the polarized illumination device.

[For production]

When the incident light beam separated by the polarizing beam splitter enters the optical phase plate 1 reflecting member, its polarization plane is rotated by 90 degrees to match that of the other beam, so by outputting both of them, 100% of the incident light beam can be utilized. I can do it.

In addition, the working surface of the polarizing beam splitter is configured to reflect λ of the P-polarized light component transmitted through the working surface of the reflecting member, and the reflecting surface of the reflecting plate is bonded to the optical phase plate. The S-polarized light component reflected by the working surface λ is converted by the optical phase plate, and the P-polarized light component converted by the reflector and the P-polarized light component are converted into the same optical path length,
It is possible to emit light with symmetry.

Furthermore, it is possible to operate the polarizing beam splitter as an analyzer by providing one optical half-phase plate and two anti-elbow plates on the return/input surface side of the polarizing beam splitter, which has two working surfaces λ whose one ends are in contact with each other at right angles. Ru.

In the projection display device having the polarized illumination device of the present invention, the light valve can be illuminated using 100% of the incident light beam, and the parallel illumination method can be made more compact.

In addition, the third polarized illumination device, a cross dichroic prism, and a reflective light valve are combined, and the reflected light from the reflective light valve is made incident from the output surface of the polarized illumination device, thereby detecting the polarized illumination device. It can also be used as a photon.

〔Example〕

Next, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the polarized illumination device of the present invention, and FIG. 2 is an explanatory diagram of the optical path in the polarized illumination device of FIG. 1.

This polarized illumination device has an active surface (formed on a slope where two right-angle prisms are bonded to each other) that transmits the P-polarized component Lp of the parallel light beam emitted from the condenser lens 24 and reflects the S-polarized component L8 at right angles. a polarizing beam splitter 26 having a vapor-deposited film) 26a, and a total reflecting surface 29a, one end of which is in contact with one end of the working surface 26a of the polarizing beam splitter 26 at right angles, and which reflects the transmitted P polarized light component L2 at right angles. a reflecting prism 29, and the reflected S-polarized light component, one end of which is in contact with one end of the active surface 26a of the polarizing beam splitter 26 at an angle of 45'' and with one end of the total reflection surface 29a of the total reflection prism 29;
It is composed of seven optical phase plates 27 on which λ λ is incident, and a reflection plate 28 having a reflective surface made of an aluminum vapor-deposited film or an optical multilayer film adhered to one optical phase plate 27 .

In this polarized illumination device, in the parallel light beam emitted from the condenser lens 24, the P polarized light component is transmitted through the working surface 26a of the polarized beam splitter 26, and the S polarized light component L8 is reflected at right angles. P polarization component and S
It is separated into polarization components λ. The reflected S-polarized light component L3 is -optical phase plate 27
The light is reflected by the reflective surface of the reflector plate 28 and passes through the optical phase plate 27 again, so that its plane of polarization is rotated by 90 degrees and converted into a P-polarized light component LP''.The converted P-polarized light The component Lp'' passes through the working surface 26a as it is and is emitted from the polarizing beam splitter 26. on the other hand,
The transmitted P-polarized light component is reflected at right angles by the total-reflection surface 29a of the total-reflection prism 29, and is emitted from the total-reflection prism 29 in parallel with the converted P-polarized light component Lp''.

Therefore, in this polarized illumination device, the light ray α1.
α2. As shown by α3, since the light flux incident on the polarization beam splitter 26 always enters the action surface 26a of the polarization beam splitter 26, all the light flux has a P polarization component Lp.
and an S-polarized component Ls. Moreover, the S polarized light component L
Il+ always rotates by λ. Conversely, the P-polarized light component Lp never enters the optical phase plate 27, and the P-polarized light component Lp is emitted from the total reflection prism 29 and the other light beam is emitted from the polarization beam splitter 26. The converted P-polarized light component Lp becomes vertically symmetrical. Therefore,
Even if an imbalance occurs in the light beam incident on the polarizing beam splitter 26 due to a misalignment of the light source 21, the P-polarized light component Lp that is emitted and the converted P-polarized light component Lp''
This prevents sudden changes in illuminance at the junction with the Furthermore, since the optical path lengths of the emitted P-polarized light component and the converted P-polarized light component are equal, it is possible to prevent illuminance imbalance from occurring when non-collimated light is used. These are polarizing beam splitters 26
This is because the λ river surface 26a, the optical phase plate 27, and the total reflection surface 29a of the total reflection prism 29 are in contact with each other at a predetermined angle. In the conventional example, this cannot be realized because the working surface of the polarizing beam splitter 11 and the total reflection surface of the total reflection prism 12 are arranged in parallel.

In addition, in this polarized illumination device, when the light beam incident on the polarizing beam splitter 26 is obliquely incident on the optical phase plate 27, as shown in the light ray γ shown in FIG.
1. There is a possibility that the optical phase plate 27 transmits or absorbs the light, resulting in a loss of light quantity. However, light rays having a large incident angle, such as the light ray γ, are reflected at the interface between the polarizing beam splitter 26 and the optical phase plate 27, and the incident angle decreases. Normal light with a small amount of light can be prevented by forming an optical multilayer film that transmits it.

Furthermore, when the incident light beam is incident on the total reflection surface 29a of the total reflection prism 29 at an angle equal to or less than the total reflection angle, as shown in the light ray δ shown in FIG.
Although a loss of light quantity occurs in p, this loss can also be prevented by forming a reflective optical multilayer film, a metal reflective film, or the like on the total reflection surface 29a.

As described above, in this polarized illumination device, both the P polarized light component Lp and the S polarized light component L8 separated by the polarized beam splitter 26 can be used as illumination light for a light valve (not shown). utilization efficiency will be improved. Furthermore, the unbalance of the illuminance distribution, which is a problem when illuminating the P-polarized light component Lp and the converted P-polarized light component Lp'' in parallel, is dramatically improved, and the first
The distance between the polarized illumination device and the light bulb, which was difficult to solve with the method of illuminating the light bulb with the combined light shown in Figure 0, can be shortened, and the projection type display device having the polarized illumination device of the present invention can also be made smaller. It becomes possible.

Note that the total reflection prism 29 is the polarizing beam splitter 2
It may be formed integrally with the right angle prism on the total reflection prism 29 side of No. 6.

FIG. 3 is a configuration diagram showing a second embodiment of the polarized illumination device of the present invention.

This polarized illumination device differs from the one shown in Figure 1 as follows:
The P-polarized light component transmitted by the working surface 36a of the polarizing beam splitter 36 is emitted as it is from the polarizing beam splitter 36, and the P-polarized light component L is transmitted by the working surface plate 371 and the reflecting plate 38.
p", the total reflection surface 3 of the total reflection prism 39
9a and is reflected at right angles from the total reflection prism 39.
The polarized light component is emitted parallel to the polarized light component.

In this polarized illumination device, the traveling directions of the incident light beam and the output light beam can be matched without adding any other optical components. Furthermore, since the optical path lengths of the emitted P-polarized light component and the converted P-polarized light component II are different, there is a problem in using it for non-collimated light. It has the same effect as a polarized illumination device.

Note that the total reflection prism 39 is the polarizing beam splitter 3
It may be formed integrally with the right angle prism on the total reflection prism 39 side of No. 6.

FIG. 4 is a configuration diagram showing a third embodiment of the polarized illumination device of the present invention.

This polarized illumination device has a reflector plate 2 of the polarized illumination device shown in FIG.
8 is replaced by a right-angle prism 40, and the S-polarized light component reflected by the working surface 46a of the polarizing beam splitter 46 is
is reflected without generating unnecessary polarized light components.

In this embodiment, the S-polarized light component is left and right inverted and output and converted into a P-polarized light component Lp''. Therefore, the converted P-polarized light component Lp'' and the P-polarized light component emitted from the total reflection prism 49 are , p, the symmetry described in the polarized illumination device of FIG. 1 is lost, so the polarized beam splitter 4
If an unbalance occurs in the incident light flux incident on the light source 6, an unbalance in the illuminance distribution is likely to occur. In addition, since the optical path lengths of the P-polarized light component Lp emitted from the total reflection prism 49 and the converted P-polarized light component II emitted from the polarization beam splitter 46 are different, they can also be used for non-collimated light. There is a problem, but other than that, it is the first
It has the same effect as the polarized illumination device shown in the figure.

Note that the total reflection prism 49 is the polarizing beam splitter 4
It may be formed integrally with the right angle prism on the total reflection prism 49 side of No. 6.

FIG. 5 is a configuration diagram showing a fourth embodiment of the polarized illumination device of the present invention.

This polarized illumination device has a first working surface (one of two slopes to which three right-angle prisms are bonded) that transmits the P-polarized component Lp of the incident light beam and reflects the S-polarized component L8 at right angles.
a vapor deposited film formed on the other one of the two slopes 56a, and a similar second working surface 56b (a vapor deposited film formed on the other one of the two slopes) whose one end is in contact with the first working surface 56a at right angles. a polarizing beam splitter 56 with one end having a second working surface 56b;
The polarizing beam splitter 58 is configured of a reflecting plate 58 having a reflecting surface that is in contact with the other end at an angle of 45 degrees and is bonded to the return/input surface side of the polarizing beam splitter 56 .

The S-polarized component Ls of the incident light beam from the condenser lens (not shown) is transmitted to the first working surface 56 of the polarizing beam splitter 56.
It is reflected by a and emitted as is. On the other hand, the P-polarized component LP of the incident light beam is the first polarized light component LP of the polarizing beam splitter 56.
After the polarization plane is rotated by 90 degrees by the second working surface, the reflecting plate 58, and converted into the S-polarized light component Ls'', it is reflected at right angles by the second working surface 56b of the polarizing beam splitter 56, and the S-polarized light component Ls is emitted in the same direction.

In this example, the S polarized light component and the converted S
Since the optical path length is different for the polarized light component L6'', there is a problem in using it for non-collimated light, but in other respects it has the same effect as the polarized illumination device shown in FIG. 1. In this case, since the optical phase plate 57 and the reflection plate 58 are not arranged on the anti-outgoing side of the polarized beam λ beam watter 56, it can also be operated as an analyzer (details will be described later).

Next, an embodiment of a projection type display device constructed by combining the polarized illumination device according to the present invention with other optical components will be described.

FIG. 6 is a diagram illustrating a main part of an embodiment of a projection display device having the polarized illumination device shown in FIG. 5.

As shown in FIG. 6, this projection display device includes a light source 61,
A light source section consisting of a reflective mirror 62, a heat ray cut filter 63, and a condenser lens 64], OO, a polarized illumination device 101 shown in FIG. A cross dichroic prism 102 on which reflective liquid crystal light valves 65R, 65G, and 65B for red, green, and blue are adhered, respectively, and a projection lens 103 provided on the opposite output surface side of the polarized illumination device 101 are provided. have

The S-polarized light component L8 of the white parallel light flux emitted from the light source unit 100 is reflected at right angles by the first working surface 56a of the polarizing beam splitter 56 that constitutes the polarized illumination device 101 (see FIG. 5), and is reflected by the cross dichroic prism. 102. In addition, as described above, the P polarized light component Lp of the white parallel light flux is
After being converted into polarized light components L, ", it is reflected at right angles from the second working surface 56b of the polarizing beam splitter 56 (see FIG. 5) and enters the cross dichroic prism 102. In other words, the white parallel light flux is polarized light. S in the lighting device 101
It is converted into a linearly polarized light beam consisting of polarized light components Ls and Ls'', and is emitted to the cross dichroic prism IO2.

The linearly polarized light beam passes through a cross dichroic prism 10
2, each color luminous flux R, G of red, green, and blue.

The light is separated into three light beams B and projected onto reflective liquid crystal light valves 65R, 65G, and 65B for red, green, and blue, respectively. Reflective liquid crystal light valve 65R, 65G.

The liquid crystal used in 65B is ECB (Elec-
trically controlled biref
ringence) type or 45° TN type, and has the property of rotating the plane of polarization of incident light by the voltage applied according to the image signal. The incident light is a linearly polarized light beam with an S-polarized component, but the reflected light becomes a light beam with a P-polarized component in accordance with the signal of each pixel of the image signal. The reflected lights are combined by the cross dichroic prism 102 and then returned to the polarized illumination device 101. In the polarization illumination device 101, a polarization beam splitter 56 (see FIG. 5) functions as an analyzer, and the P-polarized component Lpo of the combined reflected light is transmitted as it is, and is transmitted through the projection lens 103 as image light (not shown). projected onto the screen. On the other hand, of the S-polarized light component Lso of the combined reflected light, that which is incident on the first working surface 56a of the polarizing beam splitter 56 is reflected at a right angle by the first working surface 56a and returns to the light source section 100. In addition, the S-polarized component,
. The second working surface 56 of the polarizing beam splitter 56
The light λ incident on b is reflected at right angles by the second action surface 56b, and is incident on the optical phase plate 57, so after being converted into a P polarized component by the optical phase plate 57 and the reflection plate 58. , enters the second working surface 56b, so it passes through the second working surface 56b and the first working surface 56a and returns to the light source section 100. Therefore, the polarization beam splitter 5 of this polarization illumination device 101
6 acts as a complete detector photon.

As described above, the projection type display device converts the white parallel light beam emitted from the light source unit 100 into a linearly polarized light beam with the polarization illumination device 101 without any loss, so it has the effect of improving the light utilization efficiency. In addition, since the cross dichroic prism 102 is used to separate and combine each color light flux into two, the back focus of the projection lens l○3 can be made significantly smaller than in conventional projection display devices of this type. This has the effect of increasing the degree of freedom in design and making the entire projection display device more compact. Furthermore, there is an effect that the polarized illumination device 101 can also be operated as an analyzer.

7(A) and 7(B) are a side view and a top view, respectively, showing essential parts of an embodiment of a projection type display device having the polarized illumination device shown in FIG. 1. FIG.

This projection display device includes a light source section 110, a polarized illumination device 111 shown in FIG. polarized illumination device 1
a polarizing beam splitter 78 that reflects the P-polarized light component of the light beam at right angles to the 11 side and transmits the P-polarized light component;
A cross dichroic prism 112 to which reflective liquid crystal light valves 75R, 75G, and 75B for red, green, and blue are adhered to the other three sides, respectively, and an anticross dichroic prism 11 of the polarizing beam splitter 78.
The projection lens 113 is provided on the second side.

The white parallel light beam emitted from the light source section 100 enters the polarized illumination device 111, and as shown in FIG.
1 to the mirror 77 (hereinafter, the P-polarized light component and the converted P-polarized light component are collectively referred to as the P-polarized light flux), the P-polarized light flux is totally reflected by the mirror 77, and is transmitted to the polarizing beam splitter 78. incident. Since the polarization plane of the P-polarized light beam becomes the S-polarization plane with respect to the working surface of the polarizing beam splitter 78, the P-polarized light beam is reflected on the working surface,
The light enters the cross dichroic prism 112. The P-polarized light beam incident on the cross dichroic prism 112 operates in the same manner as the linearly polarized light beam incident on the cross dichroic prism 102 of the projection display device shown in FIG.
At G and 75B, the reflected light is modulated by the image signal and enters the polarizing beam splitter 78. At this time, the polarizing beam splitter 78 is connected to the polarizing illumination device 101 in FIG.
The component of the reflected light that passes through the polarizing beam splitter 78 acts as an analyzer in the same way as the projection lens 11.
3 onto a screen (not shown), and the image is formed on the screen.

As described above, similarly to the projection display device of this embodiment shown in FIG. 6, it is possible to improve the light utilization efficiency, improve the degree of freedom in designing the projection lens 113, and make the overall configuration more compact. There is an effect.

In this embodiment, the polarized illumination device shown in FIG. 1 was used, but it goes without saying that the same applies to the polarized illumination device shown in FIGS. 3 and 4.

Further, the polarized illumination device according to the present invention shown in FIGS. 1 and 3 to 5 and the wedge-shaped lens 14 shown in FIG.
15, a projection type display device using the transmission type liquid crystal light valve 7 shown in FIG. 10 can also be configured. Furthermore, in the projection display apparatus shown in FIGS. 8 and 9, the polarized illumination device according to the present invention may be inserted between the condenser lens 4 and the polarizing plate 5 or between the condenser lens 4 and the polarized beam splitter 6. .

[Effects of the Invention 1 The present invention is configured as described above, and therefore has the following effects.

In the polarized illumination device according to claim 1, by emitting either one of the P-polarized light component or the S-polarized light component of the incident light beam separated by the polarized beam splitter, and the polarization position, the light utilization efficiency can be improved. It has the effect of being able to improve.

In the polarized illumination device according to claim 2, the emitted 2
Since the optical path lengths of the two polarized light components are equal and symmetrical, it is possible to use it for non-collimated light and to improve the unbalance of the illuminance distribution.

Since the anti-elbow plate of the half-phase plate 1 is bonded to the return/incident surface side of the polarizing beam splitter having two working surfaces, it has the advantage that it can also function as an analyzer.

The projection type display device according to claim 4 has the effect that the brightness is improved because the light utilization efficiency can be improved by having the polarized illumination device of the present invention, and the effect that it can be made compact due to the parallel illumination method. There is.

In the projection type display device according to claim 5, one surface of the cross dichroic prism is adhered to the output surface of the polarized light illumination device according to claim 3, and the reflective light valve is illuminated to detect the polarized light illumination device. Since it can also be used as a photon, it has the effect of making it even more compact.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the polarized illumination device of the present invention, FIG. 2 is an explanatory diagram of the optical path in the polarized illumination device of FIG. 1, and FIG. FIG. 4 is a block diagram showing a third embodiment of the polarized illumination device of the present invention, and FIG. 5 is a block diagram showing the fourth embodiment of the polarized illumination device of the present invention. , FIG. 6 is a main part configuration diagram showing an embodiment of a projection type display device having the polarized illumination device shown in FIG. 5, and FIG. 7 is a diagram showing a projection type display device having the polarized illumination device shown in FIG. 8 shows a main part of an embodiment of the present invention, (A) is a side view thereof, (B) is a top view thereof, and FIG. FIG. 9 is a main part configuration diagram showing another conventional example of this type of projection display device;
FIG. 10 is a configuration diagram of the main parts of a projection type display device described in Japanese Patent Application Laid-Open No. 61-90584, and FIG.
FIG. 2 is a diagram illustrating a problem when a parallel illumination method is applied to a projection display device of zero design. 21.61...Light source, 22.62...Reflection mirror 23.63...Heat ray cut filter, 24.64...
- Condenser lens, 26.36, 46, 56.78...Polarizing beam splitter, 26a, 36a, 46a, 56a, 56b--Action surface, 28.38.58...Reflector, 29 39.49 ... Total reflection prism, 29a, 39
a, 49a... Total reflection surface, 40... Right angle prism, 65R, 65G, 65B, 75R, 75G. 75B... Reflective liquid crystal light valve, 77... Mirror 100.1.10... Light source section, 101.111... Polarized illumination device, 102.112... Cross dichroic prism, 103.113... ...Projection lens, Ls, L-...S polarized light component, Lp, Lp...P polarized light component, Lso...Synthesized S polarized light component, L, po...
Combined P polarized light components, R, G, B...color luminous flux.

Claims (1)

[Claims] 1. A polarizing beam splitter that separates an incident light beam into a first P-polarized component and a first S-polarized component, into which the first P-polarized component or the first S-polarized component is incident. , λ that is in contact with one end of the working surface of the polarizing beam splitter
/4 optical phase plate, and a reflecting member that reflects a first P-polarized light component or a first S-polarized light component transmitted through the λ/4 optical phase plate in the direction of the λ/4 optical phase plate. and the first P polarized light component or the first S polarized light component is
The optical phase plate converts the light into a second S-polarized light component or a second P-polarized light component by the reflecting member, and converts the first P-polarized light component, the second P-polarized light component, or the first S-polarized light component, the second S A polarized illumination device characterized by emitting polarized light components. 2. Transmit the P polarized component of the incident light beam, and
a polarizing beam splitter having a working surface that reflects the polarized light component at right angles; a reflecting member whose one end touches one end of the working surface of the polarizing beam splitter at right angles and which reflects the transmitted P-polarized light component at right angles; is in contact with one end of the active surface of the polarizing beam splitter at an angle of 45 degrees and with one end of the reflecting surface of the reflecting member, and the reflected S-polarized light component is incident on λ/
4 optical phase plate, and a reflecting plate having a reflective surface adhered to the λ/4 optical phase plate, and converts the reflected S-polarized light component into a P-polarized light component by the λ/4 optical phase plate and the reflecting plate. What is claimed is: 1. A polarized light illumination device, characterized in that: the converted P-polarized light component and the transmitted P-polarized light component are emitted. 3. A polarizing beam splitter having first and second working surfaces whose one end touches each other at right angles; A λ/4 optical phase plate bonded to the incident surface side, and the λ/4
a reflector having a reflective surface bonded to the optical phase plate, the P-polarized light component is converted into an S-polarized light component by the λ/4 optical phase plate and the reflector, and the S-polarized light component is converted into the S-polarized light component by the second A polarized illumination device characterized in that the S-polarized light component of the incident light beam is reflected at right angles on the first working surface and is emitted after being reflected at right angles on the first working surface. 4. A light valve type projection display device comprising the polarized illumination device according to claim 1, 2, or 3. 5. A polarized illumination device according to claim 3, a cross dichroic prism whose one surface is bonded to the output surface of the polarized illumination device, and a red color bonded to each of the other three surfaces of the cross dichroic prism, A projection display device comprising: a reflective light valve for green and blue; and a projection lens provided on the opposite exit surface side of the polarized illumination device.