JP2003330110A - Projection type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type display device which has a simple structure and can be manufactured at low cost and made small-sized and lightweight with ease. <P>SOLUTION: This device is equipped with: a light source 1a; a light guide body 2 which receives light emitted by the light source and made incident from a flank part 2a and emits the incident light to the outside of a front part via a diffusion body 2b which is provided to at least one of the front part and rear part almost orthogonally crossing the flank part, an optical modulator 3 which is so arranged as to directly receive the light emitted by the light guide body and modulates the received light; and a projection lens 4 which projects the light modulated by the optical modulator. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device which can be preferably used as a display device such as a liquid crystal projector.

[0002]

2. Description of the Related Art FIG.
FIG. 11 is a configuration diagram schematically showing a main part of a conventional projection display device disclosed in Japanese Patent Publication No. 400, etc. In the figure, 300
Is a light emitting element array in which a plurality of light emitting elements 300a that are light sources are regularly arranged, and 301a and 301b are light emitting elements 300a of the light emitting element array 300 in which a large number of small lenses are included.
Corresponding to the first and second fly-eye lenses 302a, 30 arranged in an array so as to have the same arrangement and number.
2b is a relay lens, 3 is a light modulator, 4 is a projection lens,
50 to 54 are luminous fluxes.

Next, the operation of the conventional projection type display device configured as described above will be described. Light emitting element array 30
The light flux 50 that has emitted 0 is the first fly-eye lens 30.
The light flux 51 is condensed by the second fly-eye lens 302b by the laser light 1a. The light flux 52 emitted from the second fly-eye lens 301b is relayed by the relay lenses 302a and 302b.
Is converted into a substantially parallel light flux 53 to illuminate the light modulator 3.

The light intensity distribution of the illumination light on the light modulator 3 becomes substantially uniform due to the light superimposing action of the fly-eye lens.
The light modulator 3 has a function of adjusting the amount of transmitted light by an electric input from an external driving device (not shown), and forms an image according to an input image signal. An image of the light flux 54 modulated by the light modulator 3 is projected on a screen (not shown) by the projection lens 4.

[0005]

The conventional projection display device has the structure as described above, and the fly-eye lens 301 for making the illumination light intensity distribution on the light modulator 3 substantially uniform, Since the relay lens 302 is provided, there is a problem that the number of parts of the optical system is large and the installation area is large.

The present invention has been made in order to solve the above problems of the prior art, and has a simple structure.
It is an object of the present invention to obtain a projection type display device which can be manufactured at low cost and can be easily reduced in size and weight.

[0007]

A projection type display device according to the present invention comprises a light source and at least one of a front surface portion and a rear surface portion, which light emitted from the light source enters from a side surface portion and is substantially orthogonal to the side surface portion. A light guide body that emits the light incident from the side surface portion to the outside of the front surface portion by a diffuser provided on the light guide body and the light receiving body that is arranged to directly receive the light emitted from the light guide body. The light modulator that modulates the light and the projection lens that projects the light modulated by the light modulator are configured.

Further, the projection display device according to the present invention has a light source and a diffuser provided on at least one of a front surface portion and a rear surface portion, which light emitted from the light source enters from a side surface portion and is substantially orthogonal to the side surface portion. A light guide body that emits the light incident from the side surface part to the outside of the front surface part by the body, and converts the polarization direction of unpolarized light into substantially the same linearly polarized light that is arranged on the front surface part of the light guide body. A polarization conversion element, an optical modulator arranged to directly receive the light emitted from the polarization conversion element and modulating the received light, and a projection for projecting the light modulated by the optical modulator. And a lens.

Further, the projection type display device according to the present invention is provided with a light source and at least one of a front surface portion and a rear surface portion which light emitted from the light source enters from a side surface portion and is substantially orthogonal to the side surface portion. A light guide body that emits the light incident from the side surface portion to the outside of the front surface portion by the diffuser, a quarter wave plate disposed on the back surface side of the light guide body, and a quarter wavelength plate.
A specular reflection element arranged on the side opposite to the light guide body with respect to the wave plate, a reflection type polarization separation element arranged on the front surface of the light guide body, and the reflection type polarization separation element from the reflection type polarization separation element. An optical modulator arranged to directly receive the light emitted to the side opposite to the optical body and modulating the received light, and a projection lens for projecting the light modulated by the optical modulator. It was prepared.

Further, the light source includes a plurality of light sources having different emission colors, the plurality of light sources are sequentially blinked for each emission color in a time division manner, and the light modulator is provided for each emission color of the light source. It is characterized in that it is modulated in synchronization with the blinking timing.

Further, there are provided a plurality of light source units each of which has a light emission color of a single emission color and different emission colors from each other, and the light modulators are respectively provided corresponding to the plurality of light source units. It is provided with a color synthesizing optical element that superimposes the light flux emitted from the optical modulator on the same optical axis.

Further, the light source is characterized by being constituted by a light emitting diode or a laser diode.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 and 2 are views for explaining a projection display apparatus according to Embodiment 1 for carrying out the present invention. FIG. 1 is a perspective view schematically showing the configuration of a main part, and FIG. 2 is an optical system. FIG. 7 is a side view for explaining the operation of FIG. In the figure, reference numeral 1 denotes a light source unit, which is composed of a plurality of light sources 1a such as light emitting diodes arranged in a line and a holding member 1b for holding the light sources 1a. Reference numeral 2 is a light guide (light guide plate) arranged below the light source unit 1 in the figure, 2a is a side surface portion used as an incident surface to the light guide 2, and 2b is a front surface of the light guide 2. It is a diffuser that forms an emission surface provided below the central portion of the portion.

Reference numeral 3 indicates the front of the diffuser 2b (rightward in the figure).
An optical modulator 4 such as a liquid crystal panel disposed in the is a projection lens for projecting the light modulated by the optical modulator 3 onto a screen (not shown). The control circuit for controlling the light modulator 3 and the light source 1a according to the video signal is
Since a general one can be used without any special limitation, the illustration is omitted. In the first embodiment, the diffuser 2b is formed by subjecting a predetermined portion of the light guide 2 to roughening (grinding). Throughout the drawings, the same or corresponding parts will be denoted by the same reference symbols, without redundant description.

Next, the first embodiment configured as described above
The operation will be described with reference to FIG. The light flux 100 emitted from the light source 1 a installed in the light source unit 1 enters the inside of the light guide 2 from the side surface portion 2 a which is one side surface of the light guide 2. The light flux 101 that has entered the inside of the light guide body 2 is
It propagates while being totally reflected inside. The light flux 101 is sequentially emitted to the outside (right side in the drawing) of the light guide 2 by the diffuser 2b provided on the surface of the front surface of the light guide 2 during the propagation. The emitted light flux 102 enters the optical modulator 3, undergoes modulation corresponding to a video signal, and is emitted from the optical modulator 3. The light flux 103 emitted from the light modulator 3 becomes a light flux 104 by the projection lens 4 and is projected on a screen (not shown) to reproduce an image.

As described above, according to the first embodiment, the light emitted from the light source 1a is the side surface 2 which is the incident surface.
Since the light guide body 2 is used, which is incident from the side a and is emitted forward by the diffuser 2b provided on the front surface portion substantially orthogonal to the side surface portion 2a, the light is incident from the side surface portion 2a. It eliminates the need for numerous optical elements such as fly-eye lenses and relay lenses, which can greatly reduce the number of parts and reduce the size and weight.

The number of light sources 1a shown in FIGS. 1 and 2 is not particularly limited, and may be larger or smaller. Further, the diffuser 2b provided on the light guide 2 is
The present invention is not limited to the rough surface treatment (sand surface treatment), and may be, for example, print dots, prisms, minute protrusions, minute depressions, or the like having the same function. In the first embodiment, the diffuser 2b is provided only on the front surface portion, that is, on the right emission surface side in the drawing, but it is provided on the rear surface opposite to the emission surface side, or on both the emission surface side and the opposite emission surface side. Even if it is installed on the surface, the same effect can be expected.

Embodiment 2. 3 to 5 are views for explaining the structure of a projection display apparatus according to a second embodiment for carrying out the present invention. FIG. 3 is a perspective view schematically showing the configuration of a main part, and FIG. A side view for explaining the operation of the optical system,
FIG. 5 is a diagram for explaining the polarization conversion element used.
FIG. 5A is a perspective view schematically showing the structure, and FIG. 5B is a plan view for explaining the polarization operation. In the figure, 5 is a polarization conversion element arranged between the front surface of the diffuser 2b of the light guide 2 and the light modulator 3, and 5a is a polarization separation surface provided on the polarization conversion element 5 in large numbers. Is a total reflection surface which is regularly arranged alternately with the polarization splitting surface 5a, and 5c is a half-wave plate which is provided in front of the polarization splitting surface 5a in the transmission direction.

As the light modulator 3, an element utilizing linearly polarized light is used. What can be preferably used as an element utilizing this linearly polarized light,
For example, a twisted nematic liquid crystal panel sandwiched between two polarizing plates held in a crossed nicols state can be given. The other configuration is similar to that of the first embodiment, and therefore the description is omitted.

Next, the operation of the second embodiment configured as described above will be described. The light flux 100 emitted from the light source 1 a installed in the light source unit 1 enters the inside of the light guide 2 from the side surface portion 2 a of the light guide 2. Incident light flux 10
1 propagates while being totally reflected inside the light guide 2.
The light that reaches the diffuser 2b provided on the surface of the light guide 2 in the middle of propagation of the light flux 101 is emitted to the outside of the light guide 2, and finally all the light flux 101 is guided. 2 are sequentially emitted to the outside. The emitted light flux 102 enters the polarization conversion element 5.

The light beam incident on the polarization conversion element 5 is separated by the polarization separation surface 5a into P-polarized light (electric field vector component in a plane horizontal to the paper) and S-polarized light (electric field vector component in a plane perpendicular to the paper). , And luminous fluxes 102P and 102S, respectively. The light beam 102P has its polarization direction rotated 90 degrees by the half-wave plate 5c, and becomes an S-polarized light beam 105a. on the other hand,
The S-polarized light beam 102S reflected by the polarization splitting surface 5a is then totally reflected by the total reflection surface 5b and the traveling direction thereof is deflected by 90 degrees, and exits the polarization conversion element 5 to become a light beam 105b.

As described above, the light beam 102 that has entered the polarization conversion element 5 is converted into a substantially linearly polarized light beam 105, which subsequently enters the optical modulator 3. The light flux 105 incident on the optical modulator 3 is controlled by a control circuit (not shown).
The light corresponding to the video signal is modulated and emitted from the optical modulator 3. The light beam 106 emitted from the light modulator 3 becomes a light beam 107 by the projection lens 4 and is projected on a screen (not shown) to reproduce an image.

As described above, according to the second embodiment, the polarization conversion element 5 is arranged between the light guide 2 and the light modulator 3, and the light modulator 3 uses linearly polarized light. By using, the use of a large number of optical elements such as a relay lens is not required, and it is possible to achieve a large reduction in the number of parts, a reduction in size and weight, and a significant reduction in optical loss.

The number of light sources 1a and the color of light emitted are not particularly limited, but for example, three light sources of red, green and blue are used as light sources.
Using primary color light emitters, these are sequentially turned on by a control circuit (not shown) in a time division manner, and the light modulator 3 is controlled in a time division manner in synchronization with the lighting timing of the light sources of the three colors, thereby performing color display. It is also free to do so.

Embodiment 3. 6 and 7 are views for explaining the structure of a projection display device according to a third embodiment for carrying out the present invention. FIG. 6 is a perspective view schematically showing a schematic configuration, and FIG. It is a side view for explaining operation of a system. In the figure, 6 is a reflective polarization separation element disposed between the front surface of the diffuser 2b of the light guide 2 and the light modulator 3, and 7 is the rear of the back surface of the light guide 2 (to the left of the figure). ) Is a quarter wavelength plate, and 8 is a specular reflection element provided on the side opposite to the light guide 2 with respect to the quarter wavelength plate 7.

As the optical modulator 3, an element utilizing linearly polarized light is used. What can be preferably used as an element utilizing this linearly polarized light,
For example, a twisted nematic liquid crystal panel sandwiched between two polarizing plates held in a crossed nicols state can be given. The other configuration is similar to that of the first embodiment, and therefore the description is omitted.

Next, a third embodiment configured as described above
The operation of will be described. The light flux 100 emitted from the light source 1a installed in the light source unit 1 enters the inside of the light guide 2 from the side surface portion 2a of one side surface of the light guide 2. The incident light flux 101 propagates while being totally reflected inside the light guide 2. The light flux 101 is sequentially emitted to the outside of the light guide 2 by the diffuser 2b provided on the surface of the light guide 2 during the propagation. The polarization state of the emitted light flux 102 is non-polarized.

Next, the light beam 102 is incident on the reflection type polarization separation element 6. The reflective polarization separation element 6 reflects the linearly polarized light in the specific polarization direction of the unpolarized light beam 102 to form a light beam 108, and the linearly polarized light in the direction orthogonal to the light beam 108 is reflected by the reflection type polarization separation element 6. And becomes a light beam 116. After passing through the optical modulator 3, the transmitted light flux 116 undergoes modulation corresponding to a video signal by a control circuit (not shown) and then exits from the optical modulator 3. The light flux 117 emitted from the light modulator 3 is transmitted by the projection lens 4 to the light flux 1
Then, the image is projected on a screen (not shown) and the image is reproduced.

On the other hand, the light beam 108 reflected by the reflection type polarization beam splitting element 6 travels in the opposite direction from the right side to the left side in the figure to the light guide 2.
Through. The luminous flux 109 that has passed through the light guide 2 is ¼
It enters the wave plate 7. The optical axis of the quarter-wave plate 7 is installed so as to form an angle of 45 degrees with the linear polarization direction of the light beam 109. Therefore, the luminous flux 11 transmitted through the quarter-wave plate 7
0 is circularly polarized light. The light flux 110 is reflected by the specular reflection element 8 to become a light flux 111, which again enters the quarter-wave plate 7.

The incident light beam 111 undergoes conversion of the polarization direction by the ¼ wavelength plate, and becomes a linearly polarized light beam 112 which is just orthogonal to the linear polarization direction of the light beam 109 (that is, the same polarization direction as the light beam 116). The light flux 112 passes through the light guide 2 and becomes a light flux 113. The light flux 113 passes through the reflective polarization separation element 6. After the transmitted light flux 114 is incident on the optical modulator 3, it is subjected to modulation corresponding to a video signal and is then modulated by the optical modulator 3.
Exit from. The light beam 115 emitted from the light modulator 3 becomes a light beam 118 by the projection lens 4 and is projected on a screen (not shown) to reproduce an image.

As described above, according to the third embodiment, the reflection type polarization separation element 6 is arranged between the light guide 2 and the optical modulator 3, and the reflection type polarization separation element 6 is provided on the back side of the light guide 2. Since the / 4 wavelength plate 7 and the regular reflection element 8 are provided and the element that uses linearly polarized light is used as the optical modulator 3, a large number of optical elements such as a relay lens are unnecessary, and the number of parts is significantly reduced. In addition to being compact and lightweight, it has the effect of significantly reducing light loss.

Also in the third embodiment, the number of light sources 1a and the color of light emission are not particularly limited, and for example, light sources of three primary colors of red, green, and blue are used for the light source in the drawing. It is also possible to perform color display by sequentially lighting these in a time-division manner by a control circuit and controlling the light modulator 3 in a time-division manner in synchronization with the lighting timing of the light sources of the three colors.

Fourth Embodiment 8 and 9 are views for explaining the structure of a projection display device according to a fourth embodiment for carrying out the present invention. FIG. 8 is a perspective view schematically showing the schematic configuration, and FIG. 9 is used. It is a perspective view which shows a light source part.
In the figure, 200 is a light source unit, 201 to 20.
3 is a regularly arranged light source that constitutes the light source unit 200, and 200b is a holding member for these light sources 201-203. The light source 201 emits red (R), the light source 202 emits green (G), and the light source 203 emits blue (B). Since the other reference numerals are the same as or correspond to those in the above-described first embodiment, the description thereof is omitted.

Next, the fourth embodiment configured as described above
The operation of will be described. Note that the propagation state of light is exactly the same as that of the first embodiment shown in FIG. 1, and therefore its description is omitted here.

The light source 20 installed in the light source unit 200
Nos. 1 to 203 are time-divisionally turned on at a predetermined timing by a control circuit (not shown). Light modulator 3
Modulates the video signal of the emission color of the light source in synchronization with the lighting timing. For example, at the moment when the red light source 201 is turned on, a red image is displayed. Next, when the light source 201 is turned off and the green light source 202 is turned on, a green image is displayed. Finally, when the light source 202 is turned off and the blue light source 203 is turned on, a blue image is displayed. As a result, RGB are temporally mixed, and a color image is reproduced on a screen (not shown).

As described above, according to the fourth embodiment, the light emitted from the light source 1a is incident from the side surface portion 2a and the diffuser 2b provided on the front surface portion substantially orthogonal to the side surface portion 2a. The light guide 2 that emits the light incident from the side surface portion 2a to the front is used, and a plurality of light sources 201 to 203 having different emission colors are provided, and the plurality of light sources are sequentially blinked for each emission color in a time division manner. In addition, the optical modulator is configured to perform modulation in synchronization with the blinking timing of each emission color of the light source, which eliminates the need for many optical elements that were required in the past, and significantly reduces the number of parts, The size and weight can be reduced, and at the same time, color images can be easily reproduced.

The light sources 201 to 20 shown in FIG.
The arrangement and quantity of the three colors and the number of colors are not limited to this, and may be more or less than this. Also,
The same effect can be expected when the light source unit 200 used in the fourth embodiment is used as the light source unit in the second or third embodiment.

Embodiment 5. 10 and 11 are views for explaining a projection type display device according to a fifth embodiment for carrying out the present invention. FIG. 10 is a perspective view schematically showing the configuration of a main part, and FIG. 11 is an optical system. FIG. 7 is a plan view for explaining the operation of FIG. In the figure, 1R, 1G and 1B are three light source units 1aR and 1aR which respectively generate red R, green G and blue B lights which are the three primary colors of light having different emission colors.
aG and 1aB are the light sources constituting the above light source units,
Reference numerals 1bR, 1bG, and 1bB are holding members for holding and fixing these light sources, respectively.

Reference numerals 2R, 2G, and 2B denote three light guides, 3R, 3G, and 3B, which are arranged corresponding to the light source units 1R, 1G, and 1B, respectively.
Three light modulators arranged corresponding to 2G and 2B, 9 is a color synthesizing optical element arranged so as to be surrounded by these three light modulators 3R, 3G, and 3B on three sides, and 4 is this color. The projection lens is arranged on the exit surface side of the combining optical element 9. Since other configurations are substantially the same as those in the first embodiment, description thereof will be omitted.

Next, a fifth embodiment configured as described above
The operation of will be described with reference to FIG. The red, green, and blue light fluxes emitted from the light source units 1R, 1G, and 1B respectively correspond to the corresponding light modulators 3R, 3G, and 3.
The operation until each light is emitted from B is the same as in the first embodiment.
The description is omitted because it is basically the same as that described.

Red, green and blue luminous fluxes 119R, 119G and 119B respectively emitted from the optical modulators 3R, 3G and 3B.
Respectively enter the color combining optical element 9. The color synthesizing optical element 9 has an R reflecting surface 9a that selectively reflects red and a B reflecting surface 9b that selectively reflects blue, and one RGB luminous flux of different wavelength bands is obtained. It has the function of superimposing on the same axis.

Therefore, the light beams 119R, 119G, and 119B incident on the color combining optical element 9 become one light beam 120 and exit from the color combining optical element 9. The emitted light beam 120 becomes a light beam 121 by the projection lens 4, is projected on a screen (not shown), and an image is reproduced.

As described above, according to the fifth embodiment, a plurality of light source units 1 of different single emission colors are provided.
R, 1G, and 1B are provided, and light guides 2R, 2G, and 2B and light modulators 3R, 3G, and 3B are separately provided corresponding to the plurality of light source units, and these light modulators are emitted. Since the color synthesizing optical element 9 that superimposes the light fluxes on the same optical axis is provided, a large number of optical elements that have been necessary in the past are not required, and the number of parts can be greatly reduced and the size and weight can be reduced. At the same time, compared with the projection display apparatus according to the fourth embodiment, each color can be combined continuously in time, and therefore, the effect of higher light utilization efficiency and high-luminance color image reproduction can be obtained. .

The color allocation and quantity of the light source units 1R to 1B shown in FIG. 10 and FIG. 11 and the number of colors are not limited to those in the above embodiment, and more or less than this. May be.

Sixth Embodiment A projection display device having the same configurations as those of the first to fifth embodiments was obtained, except that a light emitting diode or a laser diode was used as the light source 1a. (Detailed illustration and description omitted)

According to the sixth embodiment, since the light source unit is extremely small and lightweight and is a solid-state light emitting element, it has a long life, high color purity and good image color reproducibility. The device can be realized.

By the way, in the above description of the embodiment, an example in which the diffuser 2a of the light guide 2 is provided in the downward direction from above the central part of the light guide 2 has been shown, but the present invention is not limited to this. However, the light guide 2 may be provided on the front surface, the back surface, or both surfaces of the light guide 2, for example. In addition, it goes without saying that various modifications and changes, addition of functions, and the like can be made within the scope of the present invention as the configurations of the above-described embodiments are merely examples.

[0048]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect of the invention, it is possible to reduce the number of parts by reducing the number of optical elements, and to reduce the size and weight.

According to the second aspect of the invention, it is possible to reduce the number of parts by reducing the number of optical elements, to reduce the size and weight, and to improve the light utilization efficiency and brightness.

According to the third aspect of the invention, the number of optical elements can be greatly reduced, the number of parts can be reduced, and the size and weight can be reduced. In addition, the light utilization efficiency can be improved and the brightness can be improved.

According to the fourth aspect of the present invention, the number of parts can be greatly reduced by reducing the number of optical elements, the size and weight can be reduced, and full-color display can be performed with a simple structure.

According to the fifth aspect of the present invention, the number of optical elements can be greatly reduced to reduce the number of parts, and the size and weight can be reduced. Further, the simple structure has high light utilization efficiency and high brightness. Full color display is possible.

According to the sixth aspect of the invention, the number of optical elements can be greatly reduced, and the size and weight of the light source unit can be reduced, and the size and weight of the light source unit can be reduced. It is possible to improve.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing a main configuration of a projection display device according to a first embodiment.

FIG. 2 is a side view for explaining the operation of the optical system according to the first embodiment.

FIG. 3 is a perspective view schematically showing a main configuration of a projection display device according to a second embodiment.

FIG. 4 is a side view for explaining the operation of the optical system according to the second embodiment.

5A and 5B are diagrams for explaining a polarization conversion element used in the second embodiment, FIG. 5A is a perspective view schematically showing the structure of the polarization conversion element, and FIG. 5B is a plan view illustrating polarization operation. Is.

FIG. 6 is a perspective view schematically showing a main configuration of a projection display device according to a third embodiment.

FIG. 7 is a side view for explaining the operation of the optical system of the projection type display device in the third embodiment.

FIG. 8 is a perspective view schematically showing a main part configuration of a projection display device according to a fourth embodiment.

FIG. 9 is a perspective view schematically showing a light source unit used in the fourth embodiment.

FIG. 10 is a perspective view schematically showing a main configuration of a projection display device according to a fifth embodiment.

FIG. 11 is a plan view for explaining the operation of the optical system according to the fifth embodiment.

FIG. 12 is a configuration diagram schematically showing a main part of a conventional projection display device.

[Explanation of symbols]

1 light source unit, 1a light source, 2 light guide, 2
a diffuser, 3 light modulator, 4 projection lens, 5
Polarization conversion element, 6 reflective polarization separation element, 7 1 /
4 wavelength plate, 8 specular reflection element, 9 color synthesizing optical element.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G02F 1/133 535 G02F 1/133 535 1/1335 1/1335 1/13357 1/13357 (72) Inventor Nobuyuki Omoto 2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) Inventor Yasushi Kuoka 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. F-term (reference) 2H088 EA13 HA15 HA17 HA18 HA24 HA25 HA28 MA06 MA16 MA20 2H091 FA07Z FA11Z FA26X FA26Z FA29Z FA45Z LA11 LA12 LA16 LA30 2H093 NC43 ND08 ND42 ND53 NE06 2H099 AA11 BA09 CA07 2K103 AA01 AA05 AA11 AB07 BC03 BA05 BA05 BA05

Claims (6)

[Claims] 1. A light source and light emitted from the light source is incident from a side surface portion and is incident from the side surface portion by a diffuser provided on at least one of a front surface portion and a rear surface portion substantially orthogonal to the side surface portion. And a light modulator for directly receiving the light emitted from the light guide, and a light modulator for modulating the received light. And a projection lens for projecting light modulated by a container. 2. A light source and light emitted from the light source is incident from a side surface portion, and is incident from the side surface portion by a diffuser provided on at least one of a front surface portion and a rear surface portion substantially orthogonal to the side surface portion. And a polarization conversion element for converting the polarization direction of unpolarized light into substantially the same linearly polarized light, which is disposed on the front surface of the light guide, and the polarization conversion device. An optical modulator arranged to directly receive the light emitted from the element, which modulates the received light, and a projection lens which projects the light modulated by the optical modulator. Projection display device. 3. A light source and light emitted from the light source is incident from a side surface portion, and is incident from the side surface portion by a diffuser provided on at least one of a front surface portion and a rear surface portion substantially orthogonal to the side surface portion. A light guide that emits light to the outside of the front surface, a quarter-wave plate disposed on the back surface side of the light guide, and the light guide opposite the quarter-wave plate. Side specular reflection element, a reflection-type polarization separation element disposed on the front surface of the light guide, and light emitted from the reflection-type polarization separation element to the opposite side of the light guide. An optical modulator arranged to directly receive the light and modulating the received light,
A projection type display device, comprising: a projection lens for projecting light modulated by the light modulator. 4. The light source includes a plurality of light sources having different emission colors, the plurality of light sources are sequentially blinked for each emission color in a time division manner, and the light modulator is provided for each emission color of the light source. The projection display device according to any one of claims 1 to 3, wherein the projection display device is modulated in synchronization with a blinking timing. 5. A plurality of light source units each having a light emission color of a single emission color and different in emission color from each other are provided, and the light modulators are separately provided in correspondence with the plurality of light source units, respectively. 4. The projection display device according to claim 1, further comprising a color synthesizing optical element that superimposes the light flux emitted from the light modulator on the same optical axis. 6. The projection display device according to claim 1, wherein the light source is composed of a light emitting diode or a laser diode.