JP2003329977A - Projection display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection display device which has no luminance nonuniformity and can yield a picture of high quality. <P>SOLUTION: The projection display device is provided with: a uniform illumination optical system 30 which makes the light emitted by a light source 11 uniform; an optical modulator 60 which modules the light made uniform by the uniform illumination optical system; and a projection lens 70 which projects the light modulated by the optical modulator. The display device is further equipped with a light guide member 21 which is arranged between the light source and uniform illumination optical system and receives, from an incident surface 21a of a flank part, the light emitted by the light source and projects the light from a projection surface 21d nearly orthogonal to the flank part to the uniform illumination optical system. <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 in, for example, a projector device for displaying a video image.

[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, 90 is an optical axis, 110 is a light emitting element array in which light sources such as light emitting diodes are regularly arranged, and 120 is a plurality of small lenses arranged in the same arrangement and number corresponding to the light sources of the light emitting element array 110. A first lens array plate configured in an array, 12
Reference numeral 1 is a second lens array plate disposed behind the first lens array plate 120, 130 and 131 are lenses, and 140.
Is a light modulator controlled by a drive circuit (not shown) in synchronization with the light emitting element array 110 according to a video signal, 150 is a projection lens, 160 is a screen,
Each component is arranged on the optical axis 90.

Next, the operation of the conventional device constructed as described above will be described. The light emitted from the light emitting element array 110 is incident on the first lens array plate 120. Each lens of the first lens array plate 120 forms a light emitting element image in the vicinity of each corresponding lens of the second lens array plate 121. Further, the second lens array plate 12
The image of the vicinity of each lens of the first lens array plate 120 is superimposed and formed in the vicinity of the optical modulator 140 by the 1 and the lenses 130 and 131. An image of the light modulated by the light modulator 140 is projected on the screen 160 by the projection lens 150.

[0004]

In the conventional projection display device having such a configuration, since the light emission patterns of the respective light emitting elements are superposed on the light modulator 140, uneven brightness occurs and high quality is achieved. There was a difficulty in getting the video.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object thereof is to provide a projection type display device which can obtain a high quality image without unevenness in brightness.

[0006]

A projection type display device according to the present invention is a uniform illumination optical system for uniformizing the light emitted from a light source, and a light for modulating the light uniformized by the uniform illumination optical system. In a projection display device including a modulator and a projection lens that projects the light modulated by the light modulator, the light emitted from the light source is disposed between the light source and the uniform illumination optical system. Is provided from the incident surface of the side surface portion, and is emitted to the uniform illumination optical system from the emission surface substantially orthogonal to the side surface portion.

Further, between the uniform illumination optical system and the projection lens, a dichroic mirror for separating the light emitted from the uniform illumination optical system into different directions according to wavelengths, and each of the dichroic mirrors separated by the dichroic mirror. A plurality of light modulators for respectively modulating light and a color synthesizing optical element for superposing the lights modulated by the plurality of light modulators on the same optical axis are provided.

A lens array is used as the uniform illumination optical system.

Further, a polarization conversion element for converting the polarization direction of the unpolarized light into substantially the same linearly polarized light is provided between the lens array and the optical modulator.

Further, as the light source, a plurality of light sources having different emission colors are used.

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

Further, a plurality of light source units having mutually different emission colors, a plurality of light guide members arranged for each of the plurality of light source units, and light emitted from the plurality of light guide members on the same optical axis. And a color synthesizing optical element for overlapping.

Furthermore, as the uniform illumination optical system,
It is configured to use a rod integrator.

A light emitting diode is used as the light source.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 to 6
3A and 3B are diagrams for explaining the projection display apparatus according to the first embodiment. FIG. 1 is a configuration diagram schematically showing a schematic configuration, FIG. 2 is a diagram illustrating an arrangement of light sources to be used, and FIG. FIG. 4 is a perspective view schematically showing an optical member, FIG. 4 is a perspective view schematically showing a lens array to be used, FIG. 5 is a perspective view schematically showing a deflection conversion element to be used, and FIG. 6 is a projection display according to the first embodiment. It is explanatory drawing which shows the effect of an apparatus in comparison with the case of the conventional apparatus. Note that the same reference numerals denote the same or corresponding parts throughout the drawings.

In the figure, 10 is a light source unit,
Light emitting diode 11 as a light source, holding member 12 for holding the light emitting diode 11, the light emitting diode 11
Is provided so as to surround (1) and is configured by a reflector 13 or the like that reflects the light of the light emitting diode 11 forward (downward in the drawing).

Reference numeral 20 denotes a light guide unit which is arranged in the light emitting direction of the light source unit 10, and which is the incident surface 2 of the side surface.
The light incident from 1a is reflected by the fine prism array 21c provided on the side opposite to the exit surface 21b, and the optical axis 90 is output from the exit surface 21d formed at an angle of approximately 90 degrees with respect to the entrance surface 21a.
The light guide plate 21 as a light guide member that emits light in the direction of, and a reflection member 22 that reflects the light on the back surface of the light guide plate 21 forward (to the right in FIG. 1).

Reference numeral 30 denotes a uniform illumination optical system arranged in a light emitting direction of the light guiding unit 20, and a first lens array plate 31 as a first lens array sequentially arranged in a light traveling direction. , A second lens array plate 32 as a second lens array, a field lens 33, and the like. 40 is a polarization conversion element disposed between the second lens array plate 32 and the field lens 33, 50 is a condenser lens, 60 is a liquid crystal panel as an optical modulator, and 70 is an image on a screen (not shown). Is a projection lens, 80 is a drive circuit for driving the light emitting diode 11 and the light modulator 60, and 90 is an optical axis.

Next, the main constituent members will be described more specifically. As shown in FIG. 2, the light source unit 10 includes a red light 11r and a green light 1 which are three primary colors of light emitted as light sources.
Three types of light emitting diodes of 1 g and blue 11 r are used, and these are regularly arranged and mounted on the holding member 12. In order to adjust the chromaticity of the colors obtained by mixing the red, green, and blue lights, in the first embodiment, light emitting diodes are used at a ratio of 2 reds, 6 greens, and 2 blues. Is configured.

The holding member 12 is a light emitting diode 11
It is desirable to use a material having a high thermal conductivity, such as aluminum, in order to release the heat generated from the material.
Further, the reflector 13 efficiently makes the light generated from the light emitting diode 11 incident on the light guide plate 21, and thus is made of a silver or white material having a high reflectance, specifically, a reflectance of 70%.
As described above, it is preferable to use 90% or more of the material.

Further, as shown in an enlarged view in FIG. 3, the light guide plate 21 has a light emitting function for efficiently emitting light from the emitting surface 21d, and in the first embodiment, the light emitting plate 21 is finely arranged on the counter emitting surface 21b. A prism array 21c is provided. In addition,
As a material of the light guide plate 21, for example, a transparent resin such as acrylic or polycarbonate, or glass can be preferably used.

As shown in the perspective view of FIG. 4, each of the lens array plates 31 and 32 has a plurality of lenses obtained by cutting out a condenser lens into a shape substantially similar to that of the liquid crystal panel 60. In the first embodiment, the first lens array plate 31 and the second lens array plate 32 are both lens array plates having the same specifications.

As shown in the perspective view of FIG. 5A and the partially enlarged plan view of FIG. 5B, the polarization conversion element 40 has a polarization beam splitter surface 40a, a reflection surface 40b, and a 1 /
It is composed of a two-wavelength film 40c and converts unpolarized light (mixture of S-polarized light and P-polarized light) into linearly polarized light (P-polarized light in the figure). The liquid crystal panel 60 uses the linearly polarized light deflected by the polarization conversion element 40 to perform two-dimensional light modulation in accordance with image information.

Next, the first embodiment configured as described above
The operation of will be described. The light emitted from the light emitting diode 11 installed in the light source unit 10 enters the light guide plate 21 directly or through the light source holding member 12 and the reflector 13 from the incident surface 21a of the side surface portion of the light guide plate 21. The incident light is totally reflected inside the light guide plate 21 and propagates while being mixed. During the propagation, the light whose propagation direction is deflected by the fine prism 21c is emitted from the exit surface 21d.
Is emitted in the direction of the optical axis 90 from.

At this time, a part of the light is emitted from the counter-emission surface 21b to the back side, but this light is returned to the light guide plate 21 by the reflection member 22 and eventually emitted from the emission surface 21d.
The light emitted from the light guide plate 21 enters the first lens array plate 31. Each lens forming the first lens array plate 31 condenses the incident light in the vicinity of the corresponding lens forming the second lens array plate 32.

In order to make the light efficiently enter the second lens array plate 32, the fine prism 21c is designed so that the light emitted from the light guide plate 21 has a half-value angle within 10 degrees with respect to the optical axis 90. It is desirable that the temperature is within 5 degrees, and more preferably within 5 degrees. The lenses forming the second lens array plate 32 and the field lens 33 form an image near each lens of the first lens array plate 31 on the liquid crystal panel 60.
Superimpose an image in the vicinity. As shown in FIG. 5, the polarization conversion element 40 converts the incident unpolarized light into substantially the same linearly polarized light suitable for the liquid crystal panel 60.

The divergence is suppressed by the condenser lens 50, and the light reaching the liquid crystal panel 60 is modulated by the drive circuit 80 in accordance with the video signal, and then the projection lens 70.
Causes the image to be projected on a screen (not shown) and reproduced. The drive circuit 80 synchronizes the timing of lighting the light emitting diode 11 in a time division manner for each emission color and the timing of modulating the liquid crystal panel 60 in accordance with the emission color. For example, at the moment when the red light emitting diode 11r is turned on, a red image is displayed on the liquid crystal panel 60.

Next, at the moment when the light emitting diode 11r is turned off and the green light emitting diode 11g is turned on, a green image is displayed on the liquid crystal panel 60. Finally light emitting diode 1
At the moment when 1g is turned off and the blue light emitting diode 11b is turned on, a blue image is displayed on the liquid crystal panel 60. As a result, the colors red, green, and blue are temporally mixed, and the color moving image is reproduced on the screen (not shown).

As described above, according to the first embodiment, the light from each light source propagates in the light guide plate 21 while being mixed, and is emitted from the emission surface 21d. The light that enters each of the constituent lenses is
It is not affected by the light emission pattern from each light source. Figure 6
12A schematically shows a light emission pattern in the case of the conventional device shown in FIG. 12, and the light emission pattern of the light source 110 causes a light intensity distribution on each lens forming the first lens array plate 121. On the other hand, in the case of the first embodiment, as shown in FIG. 6B, by using the light guide plate 21, the light intensity distribution in each lens forming the first lens array plate 31 is made substantially constant. be able to.

Therefore, the two lens array plates 31 and 32
With this configuration, in which the image in the vicinity of each lens forming the first lens array plate 31 is superimposed on the optical modulator, an image with a small luminance distribution can be obtained. In addition, the polarization conversion element 4
When 0, the substantially same linearly polarized light suitable for the optical modulator 60 is used, so that the light use efficiency is dramatically improved.

Further, the light source unit 10 is provided with a plurality of types of light sources having different emission colors, and the blinking of the light sources and the modulation of the light modulator 60 are synchronized with each other, so that one light modulator 60 can obtain a color image. . Further, since the light emitting diode 11 having a small element size is used as the light source,
A large number of light emitting diodes can be arranged in a small light source unit, which is compact and can achieve high brightness. Therefore, it is possible to inexpensively obtain a projection display device that produces a high-quality color image with less unevenness in the luminance distribution.

Embodiment 2. FIG. 7 is a configuration diagram schematically showing a main part of the projection display apparatus according to the second embodiment.
In the figure, 10r, 10g, and 10b are individual light source units each of which is composed of light emitting diodes of red, green, and blue whose emission colors are the three primary colors of light. Reference numeral 25 denotes a cross dichroic prism as a color synthesizing optical element, which includes the three light source units 10r, 10g, and 10
It has a function of causing the lights respectively emitted from b to be emitted on the same optical axis. The above three light source units 1
0r, 10g, and 10b are arranged so as to surround the three sides of the quadrangle of the cross dichroic prism 25 as illustrated.

A uniform illumination optical system 30 includes a first condenser lens 34 for condensing the light emitted from the cross dichroic prism 25, and the light condensed by the first condenser lens 34. The rod integrator 35 has a rectangular cross section for improving the brightness uniformity by the effect, and the second condensing lens 36 for condensing the light emitted from the rod integrator 35. Reference numeral 55 is a mirror for reflecting the light from the second condenser lens 36, and 61 is a reflection type optical modulator as an optical modulator for modulating the light reflected by the mirror 55. The other reference numerals are the same as those in the above-described first embodiment, and the description thereof will be omitted.

Next, the second embodiment configured as described above
The operation of will be described. Light source unit 10 for each emission color
The lights emitted from r, 10g, and 10b enter the light guide plate 21 from the corresponding side surfaces of the light guide plate 21. The incident light is emitted from each emission surface toward the cross dichroic prism 25 with good directivity by the light emission function provided to the light guide plate 21. Among the lights incident on the cross dichroic prism 25 from different directions, red light is reflected by the surface 25a, blue light is reflected by the surface 25b, and is deflected in the direction of the emission surface 25c.

The light emitted from the emission surface 25c constituting the cross dichroic prism 25 is the first condenser lens 3
The light is condensed toward the rod integrator 35 by 4. The light incident on the rod integrator 35 propagates in the rod integrator 35 while being mixed by the total reflection, and is emitted from the opposite surface opposite to the incident surface. The second condenser lens 36 and the mirror 55 form an image near the emitting surface of the rod integrator as a reflection type optical modulator 61.
Form an image in the vicinity. The light that has reached the reflection-type light modulator 61 is modulated by the drive circuit 80 according to the image signal, and then projected onto a screen (not shown) by the projection lens 70 to reproduce the image.

The drive circuit 80 synchronizes the timing of lighting the light emitting diodes 11r, 11g and 11b in a time division manner for each emission color and the timing of modulating the reflection type optical modulator 61 according to the emission color. For example, at the moment when the red light emitting diode 11r is turned on, a red image is displayed on the reflective light modulator 61. Next, at the moment when the light emitting diode 11r is turned off and the green light emitting diode 11g is turned on, a green image is displayed on the reflective light modulator 61. Finally, at the moment when the light emitting diode 11g is turned off and the blue light emitting diode 11b is turned on, the reflection type optical modulator 6
A blue image is displayed on 1. In this way, red, green, and blue are temporally mixed, and a color moving image or the like is reproduced on a screen (not shown).

As described above, according to the second embodiment, the plurality of light source units 10r, 10e having different emission colors from each other.
g, 10 g, and a cross dichroic prism 25 as a color synthesizing optical element for superimposing light emitted from the plurality of light source units on the same optical axis through a plurality of light guide units 20 provided separately. By providing the, it is possible to remarkably increase the brightness. Also,
Since the light from the light source unit 10 propagates in the light guide plate 21 and is emitted from the emission surface with directivity, the light can be efficiently incident on the rod integrator 35 by the first condenser lens 34.

Further, by forming an image of the light emitted from the exit surface of the rod integrator 35, which has improved the brightness uniformity by the mixing effect, in the vicinity of the reflection type optical modulator 61, an image with less unevenness in the brightness distribution can be obtained. You can Further, by providing a plurality of types of light sources with different emission colors and synchronizing the blinking of the light sources and the modulation of the light modulator, a color image can be obtained with only one light modulator. Further, since the light emitting diode having a small element size is used as the light source, it is possible to arrange a large number of light emitting diodes in a small light source unit, and it is possible to realize a small size and high brightness. Therefore, it is possible to inexpensively provide a projection display device that obtains a high-luminance, high-quality color image.

Embodiment 3. FIG. 8 is a configuration diagram schematically showing the projection display device according to the third embodiment. In the figure, 10w is a white light source unit, and 11w is a white light emitting diode as a light source provided in plurality. Two
Reference numerals 6 and 27 denote dichroic mirrors that reflect or transmit light having a wavelength within a predetermined range.
6 is disposed on the optical axis 90, and the dichroic mirror 27
Are arranged on an optical axis 90a that is substantially orthogonal to the optical axis 90. 37 and 38 are relay lenses.

Reference numerals 56, 57 and 58 are total reflection type mirrors, and the mirror 56 is the dichroic mirror 2 on the optical axis 90.
6, the mirror 57 is provided behind the relay lens 37 on the optical axis 90a, and the mirror 58 is provided behind the relay lens 38 on the optical axis 90c substantially orthogonal to the optical axis 90a. Then, as shown in the figure, the mirror 56 deflects the light in the direction of the optical axis 90 in the direction of the optical axis 90e substantially orthogonal thereto, and the mirror 57 in the direction of the optical axis 90a in the direction of the optical axis 90c substantially orthogonal thereto. The mirror 58 and the optical axis 90
The light in the c direction is deflected in the direction of the optical axis 90d which is substantially orthogonal to this.

The optical modulator 60 has an optical axis 9 for each color of red, green and blue separated by the dichroic mirrors 26 and 27.
0e, 90b, and 90d are provided on the optical modulators 0e, 90b, and 90d, respectively, and the cross dichroic prism 25 converts the light modulated by the three optical modulators 60 on one optical axis.
It is arranged so as to be superimposed on b and to be emitted to the projection lens 70. Other reference numerals are the same as or equivalent to those shown in the above-mentioned first and second embodiments, and therefore their explanations are omitted.

Next, the third embodiment configured as described above
The operation of will be described. The light emitted from the light emitting diode 11w installed in the light source unit 10w is guided by the light guide plate 2 directly or via the light source holding member 12 and the reflector 13.
The light is incident on the light guide plate 21 from the incident surface 21a of the side surface portion of No. 1.
The incident light is totally reflected inside the light guide plate 21 and propagates while being mixed. During this propagation, the light whose propagation direction is deflected by the fine prism 21c is emitted from the exit surface 2
The light is emitted from 1d in the direction indicated by the arrow.

A part of the light propagating in the light guide plate 21 is emitted from the non-emission surface 21b to the rear side in the left direction in the figure, but this light is returned to the light guide plate 21 by the reflection member 22. The light is eventually emitted from the emission surface 21d. The fine prism 21c is preferably designed so that the light emitted from the light guide plate 21 has a half-value angle within 10 degrees with respect to the optical axis 90, and more preferably within 5 degrees.

The light emitted from the light guide plate 21 enters the first lens array plate 31. Each lens forming the first lens array plate 31 condenses the incident light on the corresponding lens forming the second lens array plate 32. The respective minute lenses forming the second lens array plate 32 and the field lens 33 form an image in the vicinity of each lens of the first lens array plate 31 in the vicinity of the liquid crystal panel 60 as an optical modulator in an overlapping manner.

At this time, the white light is emitted from the dichroic mirror 2.
Red light, green light, and blue light are separated by 6 and 27, and are guided to three liquid crystal panels 60 for each color by total reflection mirrors 56, 57, and 58. The polarization conversion element 40 converts the incident unpolarized light into substantially the same linearly polarized light suitable for the liquid crystal panel 60. The light arriving at the liquid crystal panel 60, whose divergence is suppressed by the condenser lens 50, is modulated by the cross dichroic prism 25 and then projected by a projection lens 70 onto a screen (not shown). Is played.

As described above, according to the third embodiment, the light from each of the plurality of white light sources 11w propagates while being mixed in the light guide plate 21 and emitted from the emission surface 21d, so that the light from each light source is emitted. Light can be incident on each of the minute lenses forming the first lens array plate 31 with a substantially uniform luminance distribution without being affected by the light emission pattern. Therefore, by using the two lens array plates 31 and 32 and superimposing the images in the vicinity of the respective lenses forming the first lens array plate 31 on the optical modulator 60, it is possible to obtain an image with less uneven brightness distribution. it can.

Further, by the polarization converting element 40, the substantially linearly polarized light suitable for the optical modulator 60 is obtained.
The light utilization efficiency is dramatically improved. Further, by providing three light modulators 60 provided for each of the three emission colors and a cross dichroic prism 25 as a color combining optical element for combining the lights from these three light modulators 60, Can be turned on at all times, and a high-intensity color image can be obtained. Therefore, it is possible to inexpensively provide a projection display device that obtains a high-luminance, high-quality color image.

Fourth Embodiment FIG. 9 is a perspective view showing a main part of the projection type display device according to the fourth embodiment. In the figure, 10r, 10g, and 10b are red, green, and blue light source units arranged so as to surround three side surfaces of the light guide plate 21. The light guide plate 21 uses a fine prism 21e as a light emitting function. The other structure is similar to that of the first or second embodiment, and therefore the description thereof is omitted.

In the fourth embodiment, one light source unit for red, one for green, and one for blue are arranged on each of the three side surfaces of one light guide plate 21, and each of the light source units 10r, 10g, and 10b is used. One light guide plate 21
In addition to the effect of the first or second embodiment, the effect that it is easy to increase the brightness can be obtained. In the fourth embodiment, the light guide plate 21 is provided with a fine prism as a light emitting function, but in short, it is sufficient if the light guide plate 21 has a function of efficiently extracting light. 1 to
The same effect can be expected by using the fine prism array used in No. 3 or one having a light emitting function by another method such as one having a rough reflecting surface (not shown).

In the description of each of the above embodiments, the light emitting diodes 11 are arranged on the holding member 12 in a line, but the present invention is not limited to this, and for example, as shown in FIG. The light sources may be arranged in a plurality of rows such as arranged in three rows, and the same effect can be expected even if the number of light sources, the arrangement method, and the installation ratio of the light sources for each emission color are different.

Further, it is desirable that the light emitted from the light guide unit 20 is designed to have a half value angle within 10 degrees with respect to the direction orthogonal to the emission surface. For example, as shown in FIG. A prism sheet 23 for adjusting the light distribution may be used on the exit surface side of the.

Further, in the above-mentioned embodiment, an example in which a light emitting diode is used as a light source is shown, but the light source is not limited to this, and for example, a laser diode, a low pressure mercury vapor discharge lamp such as a fluorescent lamp, a metal halide lamp. Other light sources such as a high-pressure mercury vapor discharge lamp such as and a halogen lamp such as an iodine lamp may be used, and the kind and number of light sources are not limited. In addition, the light guide unit 2
0 and the light source unit 10 are integrated, or the light guide unit 20 and the uniform illumination optical system 30 are integrated, and further, the light source unit 10, the light guide unit 20, and the uniform illumination optical system 30 are integrated. It goes without saying that this can be done appropriately.

[0053]

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

According to the first aspect of the present invention, since the light guide member is provided between the light source and the uniform illumination optical system, it is possible to obtain a high-quality projection display device with less unevenness in the luminance distribution.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the light that has passed through the uniform illumination optical system is divided by the dichroic mirror for each emission color, and the light modulators are separated. By providing multiple light emitting colors and overlapping them on the same optical axis by the color synthesizing optical element, it is possible to obtain a high-quality projection display device with less unevenness in the luminance distribution, and the light source is always on. As a result, a high-luminance color image can be obtained.

According to the third aspect of the present invention, by providing the uniform illumination optical system with the lens array, it is possible to obtain a high-quality and high-luminance projection display device with less unevenness in the luminance distribution.

According to the invention of claim 4, since the polarization conversion element is provided between the lens array and the light modulator, the light from the light source can be efficiently used, and the projection type is bright and has less unevenness in the luminance distribution. A display device can be obtained.

According to the fifth aspect of the invention, since the light sources are provided with a plurality of light sources having different emission colors, a high-quality color image having high color purity and less unevenness in luminance distribution can be obtained with a simple structure. A mold display device can be obtained.

According to the sixth aspect of the present invention, the plurality of light sources having different emission colors are controlled by time division in synchronization with the optical modulator, so that there is little unevenness in the luminance distribution and one optical modulation. It is possible to obtain a high-quality color projection display device at low cost.

According to the seventh aspect of the invention, since the light source and the light guide member are provided for each emission color, it is possible to obtain a high-quality projection display device having high brightness and less unevenness in the brightness distribution. .

According to the eighth aspect of the present invention, since the rod integrator is used as the uniform illumination optical system, it is possible to easily obtain a high-quality and high-luminance projection display device with less unevenness in the luminance distribution.

According to the ninth aspect of the present invention, by using the light emitting diode as the light source, it is possible to obtain the projection type display device with less unevenness in the luminance distribution, which can easily achieve high luminance and miniaturization.

[Brief description of drawings]

FIG. 1 is a configuration diagram schematically showing a schematic configuration of a projection display device according to a first embodiment.

FIG. 2 is a diagram illustrating an array of light sources used in the first embodiment.

FIG. 3 is a perspective view schematically showing a light guide member used in the first embodiment.

FIG. 4 is a perspective view schematically showing a lens array used in the first embodiment.

FIG. 5 is a perspective view schematically showing the polarization conversion element used in the first embodiment.

FIG. 6 is an explanatory diagram showing the effect of the projection display apparatus according to the first embodiment in comparison with the case of the conventional apparatus.

FIG. 7 is a configuration diagram schematically showing a main part of a projection display device according to a second embodiment.

FIG. 8 is a configuration diagram schematically showing a projection display device according to a third embodiment.

FIG. 9 is a configuration diagram schematically showing a main part of a projection display device according to a fourth embodiment.

FIG. 10 is a plan view showing an arrangement example of light sources according to another embodiment of the present invention.

FIG. 11 is a side view schematically showing an example in which a prism sheet is provided on the front surface of a light guide plate according to another embodiment of the present invention.

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

[Explanation of symbols]

10 light source unit, 11 light source (light emitting diode), 12 holding member, 13 reflector, 20
Light guide unit, 21 light guide member (light guide plate), 22 reflection member, 30 uniform illumination optical system, 31, 32 lens array (lens array plate), 33 field lens, 34, 36, lens, 35 rod integrator, 37, 38 relay lens, 40 polarization conversion element, 50 condenser lens, 60 light modulator (liquid crystal panel), 61 light modulator (reflection type light modulator),
70 projection lens, 80 drive circuit, 90 optical axis.

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G02F 1/1335 510 G02F 1/1335 510 5C060 1/13357 1/13357 5F041 G03B 21/00 G03B 21/00 E 21/14 21/14 A H01L 33/00 H01L 33/00 LM H04N 9/31 H04N 9/31 Z // F21Y 101: 02 F21Y 101: 02 (72) Inventor Nobuyuki Omoto 2-2 Marunouchi, Chiyoda-ku, Tokyo No. 3 Sanritsu Electric Co., Ltd. (72) Inventor Yasushi Kuoka 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Sanritsu Electric Co., Ltd. F-term (reference) 2H088 EA12 HA10 HA13 HA18 HA20 HA23 HA25 HA30 MA01 MA04 2H091 FA10Z FA21X FA21Z FA23Z FA26X FA29Z FA45Z FA50Z FD07 LA03 LA16 MA07 2H093 NA63 NA64. EE12 EE25 FF06

Claims (9)

[Claims] 1. A uniform illumination optical system that homogenizes light emitted from a light source, an optical modulator that modulates the light that is homogenized by the uniform illumination optical system, and a light that is modulated by the optical modulator. In a projection display device including a projection lens for projecting, the projection display device is disposed between the light source and the uniform illumination optical system,
A projection display device comprising a light guide member that receives light emitted from the light source from an incident surface of a side surface portion and emits the light from an emission surface substantially orthogonal to the side surface portion to the uniform illumination optical system. . 2. A dichroic mirror for separating the light emitted from the uniform illumination optical system into different directions according to wavelengths between the uniform illumination optical system and the projection lens, and each of the dichroic mirrors separated by the dichroic mirror. 2. A plurality of light modulators for respectively modulating light, and a color combining optical element for superimposing the lights modulated by the plurality of light modulators on the same optical axis. Projection display device. 3. The projection display device according to claim 1, wherein the uniform illumination optical system includes a lens array. 4. A polarization conversion element for converting the polarization direction of unpolarized light into substantially the same linearly polarized light is provided between the lens array and the light modulator.
The projection display device according to. 5. The projection display device according to claim 1, wherein the light source includes a plurality of light sources having different emission colors. 6. The plurality of light sources having different emission colors are sequentially blinked for each emission color in a time division manner, and the light modulator is modulated in synchronization with the blinking timing of each emission color of the light source. The projection display device according to claim 5, wherein 7. A plurality of light source units having mutually different emission colors, a plurality of light guide members provided for each of the plurality of light source units, and light emitted from the plurality of light guide members on the same optical axis. The projection display device according to claim 1, further comprising a color synthesizing optical element for superimposing on the projection display device. 8. The projection display device according to claim 7, wherein the uniform illumination optical system is configured by using a rod integrator. 9. The projection display device according to claim 1, wherein a light emitting diode is used as the light source.