JP2000089360A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device equipped with a projector preventing the optical path of a projection optical system from being intercepted by a wiring for electrically connecting a liquid crystal panel and a driving circuit and having small depth. SOLUTION: As for this projection type display device PD1; image light is emitted to a screen 5 from the back surface side of the device as shown by a center axis PX, then it is reflected upward, becomes projected light (center axis AX) and is reflected toward the screen 5 by a 2nd reflecting mirror 160, and the center axes PX and AX of the image light and the projected light are regulated on one plane.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection display device, and more particularly to a projection display device that projects an image on a reflection mirror that forms a predetermined angle with a screen and reflects and projects the image on a screen.

[0002]

2. Description of the Related Art The configuration of a conventional projection display device will be described with reference to FIGS. FIG. 10A is a side perspective view of the projection display device PD10 described in JP-A-6-138386, FIG. 10B is a plan view thereof, and FIG. FIG. 11B is a plan view showing the projector 90 built in the display device PD10, and FIG. 11B is a cross-sectional view taken along the line A-O-O-A of FIG.

As shown in FIG. 10, a projection display device PD
Reference numeral 10 denotes a configuration in which a projector 90 including the projection lens 40 and the housing 80 is housed in a cabinet 1701. Cabinet 1701 is the first from projector 90
A second folding mirror 1601 that reflects light emitted through the folding mirror 411 of the second type, and a transmission type screen 51 are provided.

[0004] Further, as shown in FIG.
Lamp 120 for emitting white light, electrode 1 of lamp 120
21, a light source unit 1 composed of a concave mirror 130 and a condenser lens 131. A filter 140 that transmits only visible light is provided in an emission direction from the light source unit 1, and blue light is provided in front of the filter 140. A dichroic mirror 141B that reflects and transmits green and red light, and a dichroic mirror 141 that reflects red light and transmits blue and green light
And R are arranged with their main surfaces orthogonal to each other. In the optical path of the reflected light from the dichroic mirror 141R, mirrors 111b that are arranged obliquely to each other and totally reflect the light,
And a liquid crystal panel 3R having an image display section 31R, and mirrors 111a and 111d arranged obliquely to each other in the optical path of the reflected light from the dichroic mirror 141B and totally reflecting light, and an image display section. 3
1B is provided, and the optical path of the transmitted light of the dichroic mirrors 141R and 141B is
A liquid crystal panel 3G having an image display section 31G is provided.

[0005] A dichroic prism 151 that selectively reflects red and blue light and selectively transmits green light is disposed surrounded by the liquid crystal panels 3R, 3G, and 3B. A projection lens 40 is provided in the direction.

The projection lens 40 includes a stop AST for adjusting aberrations and a first bending mirror 41 for reflecting light from the dichroic prism 151 at an angle of 90 degrees.
1 and a lens system (not shown).

Next, the operation of the projection display device PD10 will be described. As the lamp 120, for example, a white light source such as a metal halide lamp, a xenon lamp, and a halogen lamp is used. The concave mirror 130 has a center of curvature at the light emitting point of the lamp 120, and is provided for efficiently sending a light beam into an optical path on the right side of the lamp 120 in the drawing.

The light emitted from the lamp, that is, the reflected light from the concave mirror 130 is collimated by the condenser lens 131 and enters the filter 140. The filter 140 transmits only visible light and reflects or absorbs unnecessary infrared rays and ultraviolet rays.
The light flux transmitted through the filter 140 is reflected by a dichroic mirror 141B that reflects blue light and transmits green and red light, and a dichroic mirror 141R that reflects red light and transmits blue and green light. The mirrors 111a, 111b, 111c, and 111d are separated into primary colors.
Of the liquid crystal panels 3R, 3G, and 3B that display monochrome images corresponding to the primary colors.
A drive circuit for displaying images on the liquid crystal panels 3R, 3G, and 3B is not shown.

Image display surfaces 31R, 31 of each liquid crystal panel
The light beams modulated by the images formed on G and 31B are combined again into one light beam by the dichroic prism 151 to become image light (central axis PX), and are bent in the projection lens 40 by the first bending mirror 411. Is converted into projection light 110 (center axis AX), and the second bending mirror 1601 of the cabinet 1701 shown in FIG.
Then, it is bent again and enlarged and projected on the screen 51. The projection lens 40 needs to correct various aberrations in order to obtain a good projection image, and is configured by combining a plurality of single lenses (not shown).

[0010] The folding mirror 1601 is used to bend the optical path from the tip of the projection lens 40 to the screen 51, so that the optical system in the cabinet 1701 is compactly stored. Then, the viewer views the enlarged image from the side facing the screen 51.

[0011]

FIG. 12 is a perspective view of the projection display device PD10 described above. FIG.
5 shows a state in which the bottom surface of the projector 90 is arranged so as to be parallel to the bottom surface of the cabinet 1701 for simplification. The central axes PX and AX of the image light and the projection light are indicated by chain lines.

As shown in FIG. 12, the projection lens 40 of the projector 90 is
Although it is arranged so as to be located almost at the center of 701,
The housing 80 is arranged at a position closer to the left side than the center of the cabinet 1701. Therefore, the image light has the central axis PX.
As shown by the arrow, the light is emitted from the left side toward the screen 51, is reflected upward by a first bending mirror (not shown) of the projection lens 40, becomes projection light (indicated by the central axis AX), and becomes second bent Screen 51 with mirror 1601
Will be reflected in the direction of.

As described above, in the projection display device PD10, the traveling direction of the projection light is set to be a direction rotated by 90 degrees with respect to the image light when projecting the screen onto the image light (in other words, the center axes PX and AX are set in the same direction. Since the projector 90 is arranged so as not to be defined in one plane, the image projected on the screen is rotated by 90 degrees with respect to the image on the liquid crystal panel.

Therefore, a horizontally long image on the screen 51,
For example, in order to form an image having an aspect ratio of 3: 4, FIG.
, The liquid crystal panels 3R, 3G,
3B had to be arranged to be vertically long (aspect ratio 4: 3).

What matters here is the structure of a liquid crystal panel for a projection display device which is generally widely known. FIG. 13 shows the configuration of the liquid crystal panel 3 (the same as the liquid crystal panels 3R, 3G, and 3B). As shown in FIG.
Is an FPC for making an electrical connection with a drive circuit of the liquid crystal panel 3 because its outer shape and the image display surface 31 are rectangular.
(Flat Printed Cable) 32 extends from the long side of the liquid crystal panel 3 in a direction perpendicular to the long side. Since the FPC 32 is bent and used so as to be parallel to the long side at the time of mounting, when the liquid crystal panels 3R, 3G, and 3B are arranged vertically in the projector 90 as shown in FIG. There was a possibility of blocking the light path. Usually, the drive circuit of the liquid crystal panel 3 is arranged outside the projector 90 in order to make the projector compact, and it is necessary to connect the liquid crystal panel 3 to the drive circuit with the FPC 32. When vertically arranged, it is necessary to bend as shown in FIG. 13, and the distance to the drive circuit becomes longer, so that there is a problem that an extension means is required and that the apparatus is easily affected by noise. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a projection in which an optical path of a projection optical system is prevented from being interrupted by wiring for electrically connecting a liquid crystal panel and a drive circuit. It is an object of the present invention to provide a projection type display device having a device and having a small depth.

[0017]

According to a first aspect of the present invention, there is provided a projection display device including a housing for incorporating an image display device and emitting image light from the image display device;
A projection unit for enlarging and projecting the image light, a projection unit for enlarging and projecting the image displayed on the image display device, and a projection light reflection unit for reflecting the projection light emitted from the projection unit. A transmission type screen that receives the projection light reflected by the reflection unit, wherein the projection unit includes an image light reflection unit that reflects the image light toward the projection light reflection unit. Wherein the projection means has a central axis of image light from the housing to the image light reflection means, a central axis of projection light from the image light reflection means to the projection light reflection means, and the projection light reflection. It is arranged so that the central axis of the projection light from the means to the transmissive screen is defined in one plane.

According to a second aspect of the present invention, in the projection type display device, the transmission type screen is rectangular, the long side is arranged horizontally, and the image display device is rectangular. It is arranged so that the long sides are horizontal in accordance with the arrangement of the transmissive screen.

According to a third aspect of the present invention, in the projection type display device, the projection means may include a central axis of image light from the housing to the image light reflection means, and the projection means may be configured to project the image light from the image light reflection means. The central axis of the projection light up to the light reflecting means is configured to be orthogonal, and the bottom surface of the housing portion is 2
They are arranged so as to form a predetermined angle of 0 degree or less.

According to a fourth aspect of the present invention, the predetermined angle includes 0 degree.

According to a fifth aspect of the present invention, in the projection display apparatus, the projection means may move the projection part between the housing and the projection part in the horizontal and vertical directions. Is further provided.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <A. First Embodiment><A-1. Device Configuration> FIG. 1 is a diagram showing a projection display device PD1 of a projection display device according to a first embodiment of the present invention. FIG. 1 (a) is a side perspective view, and FIG. 1 (b) is a plan view. Is shown. FIG. 2A is a plan view showing a projector 300 incorporated in the projection display device PD1, and FIG. 2B is a cross-sectional view taken along the line BOOB of FIG. 2A. It is.

As shown in FIG. 1, the projection display device PD1
Has a configuration in which a projector 300 (projection unit) including a projection lens 4 (projection unit) and a housing 200 (housing unit) is housed in a cabinet 170. The cabinet 170 moves the first folding mirror 41 from the projector 300.
A second folding mirror 160 (projection light reflection means) that reflects light emitted through (image light reflection means) and a transmission screen 5 are provided.

The second bending mirror 160 may be rectangular, but only needs to have a reflecting surface only in the range where the projection light 110 is incident. Therefore, if a trapezoidal mirror is used as shown by a broken line in FIG. 1B, the mirror area can be reduced as compared with a case where the mirror is made rectangular, which is effective in reducing the weight of the apparatus.

Further, as shown in FIG.
Lamp 120 for emitting white light, electrode 1 of lamp 120
21, a light source unit 1 composed of a concave mirror 130 and a condenser lens 131. A filter 140 that transmits only visible light is provided in an emission direction from the light source unit 1, and a red light is provided in front of the filter 140. A dichroic mirror 14R that reflects and transmits green / blue light and a dichroic mirror 14RG that reflects green light and transmits blue light are sequentially provided.

In the optical path of the transmitted light from the dichroic mirror 14RG, mirrors 11b and 11c which are arranged obliquely to each other and totally reflect the light, and an image display unit 31
A liquid crystal panel 3B having an image display unit 31G is provided on the optical path of the reflected light from the dichroic mirror 14RG.
(Image display device) is provided, and a mirror 1 that totally reflects the light is provided on the optical path of the reflected light of the dichroic mirror 14R.
Liquid crystal panel 3R having 1a and image display section 31R
(Image display devices) are provided in order. As shown in FIG. 2B, the liquid crystal panel 3R (the liquid crystal panel 3R).
G, 3B), the outer shape of the image display surface 31R (3
1G, 31B) are also rectangular, and are arranged horizontally so that the long sides are parallel to the bottom surface of the housing 200.

A dichroic prism 15 which selectively reflects red and blue light and selectively transmits green light is disposed, surrounded by the liquid crystal panels 3R, 3G and 3B. A projection lens 4 is provided in the direction.

The projection lens 4 has an aperture A for aberration adjustment.
The light from the ST and the dichroic prism 15 is
A first folding mirror 41 that reflects light at an angle of 0 degrees and a lens system (not shown) are incorporated.

<A-2. Operation of Projector> Next, Projector 3
The operation of 00 will be described. As the lamp 120,
For example, a white light source such as a metal halide lamp, a xenon lamp, and a halogen lamp is used. The concave mirror 130 has a center of curvature at the light emission point of the lamp 120,
It is provided for efficiently sending a light beam into the optical path above 20. The light emitted from the lamp, that is, the reflected light from the concave mirror 130 is collimated by the condenser lens 131 and enters the filter 140. The filter 140 transmits only visible light and reflects or absorbs unnecessary infrared rays and ultraviolet rays.
The luminous flux transmitted through the filter 140 reflects red light, transmits dichroic mirror 14R that transmits blue and green light, and dichroic mirror 1 that reflects green light and transmits blue light.
It is separated into three primary colors of red, green and blue by 4RG.

The red light has its optical path bent by the mirror 11a and is irradiated on the liquid crystal panel 3R, the blue light has its optical path bent by the mirrors 11b and 11c and is irradiated on the liquid crystal panel 3B, and the green light is the dichroic mirror 14b.
The light is reflected by the RG and radiated to the liquid crystal panel 3G. In addition,
A drive circuit for displaying images on the liquid crystal panels 3R, 3G, and 3B is provided outside the projector 300, but is not shown.

As described above, the liquid crystal panels 3R, 3G, 3B
Is illuminated with parallel light by the condenser lens 131 (telecentric illumination system), so that illumination with uniform chromaticity is possible even if the spectral characteristics of the dichroic mirrors 14R and 14RG have an incident angle dependence. Further, even when the display characteristics of the liquid crystal panels 3R, 3G, and 3B depend on the incident angle of the illumination light, uniform display can be obtained on the display surface of the liquid crystal panel because the illumination light is parallel.

Image display surfaces 31R, 31 of each liquid crystal panel
The light flux modulated by the images formed on G and 31B is recombined into one light flux by the dichroic prism 15 to become image light (central axis PX) and enters the projection lens 4. A folding mirror 41 is built in the projection lens 4 and has a lens system before and after the mirror. FIG. 2B illustrates a case where the inclination angle of the bending mirror 41 is 45 degrees as a typical example.

The combined light beam (image light) emitted from the dichroic prism 15 is bent by 90 degrees by the bending mirror 41, and becomes projection light 110 (center axis AX) as shown in FIG. 4 is emitted.

An optical system upstream of the projection lens 4
That is, the optical system inside the housing 200 is arranged on a plane parallel to the bottom surface 201 as shown in FIG.

The aperture AST inside the projection lens 4 has a function to determine the F value of the projection lens and to make the principal ray of the light beam entering the projection lens from each point of the liquid crystal panel parallel to the lens optical axis. Since the principal ray is made parallel by the stop AST, the light beam transmitted through the dichroic prism 15 does not have an uneven incident angle, and the uneven color of a projected image due to the incident angle dependence of the spectral characteristics of the dichroic prism 15 can be eliminated.

<A-3. Operation of Projection Display>
The operation of the projection display device PD1 will be described with reference to FIG. 1 and FIG. 3 showing a perspective view of the projection display device PD1. As shown in FIG. 1A, the housing 200 of the projector 300, in which the optical system upstream of the projection lens 4 is built, is located on the back side of the apparatus (screen 5) with respect to the central axis AX of the projection light indicated by the chain line. Image light emitted from the housing 200 travels in the projection lens 4 in the direction of the screen 5, is bent in the projection lens 4 by the first bending mirror 41, and is formed as projection light 110. The light is emitted vertically upward, and the screen 5
It is bent to the side and enlarged and projected on the screen 5.

FIG. 3 is a perspective view of the projection display device PD1 described above. In FIG. 3, for simplicity,
The state where the bottom face of the projector 300 is arranged so as to be parallel to the bottom face of the cabinet 170 is shown. The central axes PX and AX of the image light and the projection light are indicated by chain lines.

As shown in FIG. 3, the image light is emitted from the rear side of the apparatus toward the screen 5 as indicated by the central axis PX, and is upwardly directed by the first bending mirror (not shown) of the projection lens 4. Reflected projection light (indicating its central axis AX)
Thus, the light is reflected by the second bending mirror 160 in the direction of the screen 5.

<A-4. Characteristic action and effect>
In the projection display device PD1, the traveling direction of the projection light when projecting the screen is the same as the traveling direction of the image light (in other words, the central axis PX of the image light and the projection light).
And AX are defined in one plane) projector 3
Since 00 is arranged, the image on the liquid crystal panel and the image on the screen of the projection light coincide in the vertical and horizontal directions. Therefore, the liquid crystal panels 3R, 3G, and 3B may be arranged such that the image display surfaces 31R, 31G, and 31B correspond to the vertical and horizontal arrangement of the screen 5.

That is, the aspect ratio of the screen is 3: 4 in the device of the NTSC system, and the aspect ratio of the screen is 9:16 in the device of the HDTV system. The image display surfaces 31R and 31 of the liquid crystal panel inside the projector 300 so that the long side of the screen matches the long side of the enlarged image from the projector 300.
The liquid crystal panels 3R, G, 31B are arranged such that the long sides thereof are horizontal.
What is necessary is just to arrange 3G and 3B.

By arranging the liquid crystal panels 3R, 3G, and 3B in this manner, there are advantages described below. Here, the liquid crystal panel 3 (liquid crystal panels 3R, 3G, 3
(Same as B) shows a state where the long side is arranged so as to be horizontal.

The liquid crystal panel 3 for a projection display device, which is widely known, has a rectangular outer shape and an image display surface 31, and has an FPC (Flat Printed) for making an electrical connection with a driving circuit of the liquid crystal panel. Cable)
32 extend from the long side of the liquid crystal panel in a direction perpendicular to the long side. Therefore, as shown in FIG.
When the liquid crystal panels 3R, 3G, and 3B are arranged horizontally with the FPC 32 facing upward, the FPC 32 does not block the optical path.

The driving circuit for the liquid crystal panel 3 is a projector 3
00, it is necessary to connect the liquid crystal panel 3 to the drive circuit with the FPC 32. However, if the liquid crystal panel 3 is arranged horizontally, the FPC 32 does not need to be bent as in the conventional case, and the FPC 32 The overall length becomes shorter.
Therefore, means for extension is not required, and the influence of noise is reduced.

Although FIG. 4 shows a configuration in which the liquid crystal panels 3R, 3G, and 3B are laid horizontally so that the FPC 32 is on the upper side, the FPC 32 is on the lower side, that is,
0 may be arranged on the bottom side.

<A-5. Projector Arrangement for Downsizing Projection Display> Next, in order to reduce the height (H) and the depth (D) of the projection display PD1, and to reduce the size of the projection display PD1. The arrangement of the projector 300 will be described.

<A-5-1. Reduction of Depth Dimension> To reduce the depth D, the second folding mirror 16
The angle θ1 (see FIG. 1A) with respect to the vertical line
゜ It is effective to make the following. To do so, the bottom surface 201 of the housing 200 of the projector 300 and the cabinet 170
Should be set so that the central axis AX of the projection light is inclined from the direction perpendicular to the bottom surface 172 toward the rear side of the cabinet 170. is there. For this purpose, θ2 ≧ 0 ° may be satisfied. In FIG. 1, for convenience, the central axis AX of the projection light incident on the screen 5 is shown to coincide with the horizontal direction, but this is not necessarily the case, and an extension of the central axis AX is the eye position of the viewer. May be set as follows.

<A-5-2. Reduction of Height Dimension> Also, in order to reduce the height dimension H, the bottom surface 201 of the housing 200 is required.
It is necessary to appropriately set an angle θ2 between the cabinet 170 and the bottom surface 172 of the cabinet 170 (conveniently coincident with the horizontal direction in the drawing).

FIG. 1 shows a screen size of 50 inches (aspect ratio 3: 3).
This is a first example assuming the device of 4), wherein θ1 = 35 °,
θ2 = 18 °. Under these conditions, a height dimension H = 955 mm and a depth dimension D = 415 mm were obtained. Also, as a second example, by setting θ1 = 45 ° and θ2 = 0 ° at the same screen size of 50 inches, the height dimension H becomes 800 mm and the depth dimension D becomes 610 mm, and the depth dimension becomes the first example. However, the height dimension could be reduced. And in the second example, the projector 300
, That is, the bottom surface 201 of the housing 200 coincides with the horizontal direction, so that there is an advantage that assembly and inspection of the device are facilitated.

The condition for reducing the depth dimension D (θ
Taking into account 2 ≧ 0 °), it is desirable to satisfy the following conditional expression in order to reduce the depth and height of the device in a well-balanced manner.

That is, 0 ° ≦ θ2 ≦ 20 °
(1).

If the lower limit of conditional expression (1) is exceeded,
The depth of the device becomes unnecessarily large. When the value exceeds the upper limit of conditional expression (1), the height of the apparatus is unnecessarily increased, the case 200 blocks the light beam incident on the screen 5, and the case 200 projects so as to overlap the screen 5. Inconveniences such as doing so occur.

In this example, it is assumed that θ2 ≧ 0 ° or more, and the center line AX of the projection light is inclined from the direction perpendicular to the bottom surface 201 of the housing 200 to the rear side of the apparatus opposite to the screen 5. However, the case where θ2 is smaller than 0 ° refers to a state where the center line AX of the projection light is inclined to the screen 5 side. Even in this state, projection onto the screen 5 is possible depending on the arrangement angle of the second bending mirror 160.

<A-6. Movable structure of projection lens>
The movable structure of the projection lens 4 will be described with reference to FIGS. FIG. 5 is a cross-sectional view showing the positional relationship between the projection lens 4, the dichroic prism 15, and the image display surface 31 of the liquid crystal panel 3, and also shows the optical path of the projection light from the image display surface 31.

The projection lens 4 includes a first folding mirror 4
1 and eight single lenses L1 to L8. Note that the single lens L1 is disposed at the end of the screen side (referred to as a large conjugate side), and the single lens L8
Are disposed at the outermost portion on the liquid crystal panel side (referred to as a small conjugate side). Describing along the optical path, the single lenses L7, L6, L5, the stop AST, and the single lens L4 are arranged in this order from the single lens L8. The single lens L4 is arranged immediately before the first bending mirror 41, and the single lenses L3, L are arranged in the direction in which the projection light is reflected by the first bending mirror 41.
2, L1 is arranged.

By moving the projection lens 4 having such a structure in the vertical or horizontal direction with respect to the optical axis on the liquid crystal panel side (small conjugate side), that is, the optical axis of the image light in the housing. Of the enlarged image from the projector 300 projected on the screen can be adjusted.

FIG. 6 shows a case where the projection lens 4 is moved downward in the figure in parallel. In this case, as shown in FIG. 6, the projection light reflected by the first bending mirror 41 translates rightward in the figure. At this time, the telecentricity of the liquid crystal panel is maintained.

Although FIG. 6 shows the case where the projection lens 4 is moved downward in the figure, the projection lens 4 is moved in parallel.
Is translated upward in the figure, the projection light reflected by the first bending mirror 41 translates to the left in the figure,
If the projection lens 4 is moved in parallel toward the drawing, the projection light reflected by the first bending mirror 41 is moved in parallel toward the drawing, and the projection lens 4 is moved toward the drawing. If it is moved in parallel to the side, the projection light reflected by the first bending mirror 41 is moved in parallel to the other side in the figure.

As described above, the projection lens 4 is moved on the screen 5 vertically or horizontally with respect to the optical axis on the liquid crystal panel side (small conjugate side), that is, the optical axis of the image light in the housing. Since the position of the projected enlarged image from the projector 300 in the screen plane can be adjusted, when the projector 300 is installed in the cabinet 170, only the in-plane rotation direction of the projected image needs to be adjusted to the screen. The work of arranging 300 is facilitated.

Further, as shown in FIG. 5, when the first bending mirror 41 is mounted in the projection lens, the inclination angle of the off-axis light with respect to the optical axis inside the projection lens (between L3 and L4) is changed. Can be made smaller than the angle of inclination of the outgoing light with respect to the optical axis, so that the first bending mirror 4 can be made smaller than when the bending mirror is arranged outside the projection lens (screen side).
1 can be reduced in size.

Here, an example of a configuration for making the projection lens 4 movable will be described with reference to FIG. In FIG. 7, the projection lens 4 is configured to be attached to a position adjustment mechanism MV that can move in parallel in the horizontal and vertical directions.

The position adjusting mechanism MV is composed of three tables TB1, TB2 and TB3 arranged in a stacked manner.
The table TB3 is fixed to the housing 200 of the projector 300, the table TB2 is attached to the table TB3,
For example, it is a slide table that can slide horizontally. The table TB1 is a slide table that is attached to the table TB2 and that can slide, for example, in the vertical direction.

Then, by attaching the projection lens 4 to the table TB1, the tables TB1 and TB2 can be horizontally and vertically translated by sliding.

The optical system inside the housing 200 is shown in FIG.
As shown in (b), the projection lens 4 is disposed on a plane parallel to the bottom surface 201, so that the position adjustment mechanism MV is mounted horizontally and vertically to the bottom surface of the housing, so that the projection lens 4 is attached to the liquid crystal panel side (small conjugate Side), that is, in the vertical or horizontal direction with respect to the optical axis of the image light in the housing.

<A-7. Modification> In the above description, as shown in FIG. 2A, the projector 300 arranges the light source 1 below the optical axis from the dichroic prism 15 to the projection lens 4 in FIG. As shown in FIG. 2B, an example is shown in which most of the width dimension Wp of the housing 200 is distributed to the left side of the screen 5 from the center of the screen 5, but the dichroic shown in FIG. Even if the configuration is such that the components are arranged on the opposite side with the optical axis from the prism 15 to the projection lens 4 as the symmetry axis, that is, even if the light source 1 is arranged above the optical axis in the drawing, There is no change in the effect of the invention.

<B. Second Embodiment><B-1. Device Configuration> FIG. 8 is a diagram showing a projection display device PD2 according to a second embodiment of the projection display device of the present invention. FIG. 8 (a) is a side perspective view, and FIG. 8 (b) is a plan view. Is shown. FIG. 9 is a plan view showing a projector 500 (projection means) incorporated in the projection display device PD2.

The same components as those of the projection display device PD1 described with reference to FIG. 1 and the projector 300 described with reference to FIG. 2 are denoted by the same reference numerals, and redundant description will be omitted.

The projector 500 shown in FIG. 9 is different from the projector 300 of the first embodiment in which the dichroic prism 15 is used for the color synthesizing optical system, and uses the dichroic mirrors 14rg and 14GB for the color synthesizing optical system. ing.

In the projector 500 shown in FIG. 9, a dichroic mirror 14R that reflects red light and transmits green and blue light and a dichroic mirror 14RG that reflects green light and transmits blue light are provided in front of the filter 140. They are provided in order.

A liquid crystal panel 3G having an image display section 31G is provided on the optical path of the reflected light from the dichroic mirror 14RG.
A liquid crystal panel 3B having an image display section 31B is provided on the optical path of the transmitted light from the liquid crystal panel 3B.

In the optical path of the transmitted light of the liquid crystal panel 3B, a mirror 11b for totally reflecting light and a dichroic mirror 14rg for reflecting red and green light and transmitting blue light are sequentially provided at the same angle. In the optical path of the transmitted light, a dichroic mirror 14GB that reflects green light and transmits red light is provided at the same angle as the dichroic mirror 14rg. The projection lens 4 (projection unit) is provided in the emission direction of the dichroic mirror 14rg.

Although not shown, the liquid crystal panel 3R
(The same applies to the liquid crystal panels 3G and 3B.) The outer shape and the image display surface 31R (31G and 31B) are also rectangular, and are arranged horizontally so that the long sides are parallel to the bottom surface of the housing 400 (housing portion). Have been.

<B-2. Operation of Projector> Next, the operation of the projector 500 will be described with reference to FIG. Filter 1
The light beam transmitted through 40 is separated into three primary colors of red, green, and blue by a dichroic mirror 14R that reflects red light, transmits blue and green light, and a dichroic mirror 14RG that reflects green light and transmits blue light. You.

The red light, whose optical path is bent by the mirror 11a, is irradiated to the liquid crystal panel 3R, and the green light is reflected by the dichroic mirror 14RG, and
G is illuminated and the blue light is dichroic mirror 14RG
And irradiates the liquid crystal panel 3B.

Image display section 31 of liquid crystal panels 3R, 3G
The transmitted light modulated by R and 31G is combined by a dichroic mirror 14GB that reflects green light and transmits red light. The blue light modulated by the image display unit 31B of the liquid crystal panel 3B and having the optical path bent by the mirror 11b is combined with the red and green lights by the dichroic mirror 14rg that reflects the red and green lights and transmits the blue light. As a result, the light flux again enters the projection lens 4 as one light flux.

<B-3. Operation of Projection Display Device> The operation of the projection display device PD2 is the same as that of the projection display device PD1 described with reference to FIGS. 5, the light is bent in the projection lens 4 by the first bending mirror 41, emitted vertically upward as the projection light 110, bent toward the screen 5 by the second bending mirror 160, and placed on the screen 5. It is enlarged and projected.

<B-4. Characteristic action and effect>
In the projection display device PD2, the traveling direction of the projection light at the time of screen projection is the same as the traveling direction of the image light (in other words, the central axes of the image light and the projection light are 1).
(Defined in the plane of FIG. 2), the image on the liquid crystal panel and the image on the screen of the projection light coincide in vertical and horizontal directions.

Therefore, the liquid crystal panels 3R, 3G, 3B
The image display surfaces 31R, 31G, and 31B are the screen 5
The liquid crystal panels 3R, 3G, and 3B may be arranged in such a manner that the FP extending from the long side of the liquid crystal panel in a direction perpendicular to the long side.
Since the flat printed cable (C) does not block the optical path, and the FPC does not need to be bent as in the related art, the overall length of the FPC is reduced. Therefore,
No means for extension is required, and it is less susceptible to noise.

In the projector 500, the color synthesizing optical system is constituted by a dichroic mirror. Therefore, since a costly dichroic prism does not need to be used, a less expensive apparatus can be provided.

Further, since the distance from the illumination optical system (ie, the light source 1) to each of the liquid crystal panels 3R, 3G, and 3B can be equalized by three persons, each of the liquid crystal panels 3R, 3G, and 3B of the illumination light can be used.
Irradiation distribution on the screen becomes almost uniform among the three members, and color unevenness of the composite projected image formed on the screen 5 can be reduced.

The height H and the depth D of the projection display device PD2 can be set by appropriately setting the angle θ2 between the housing bottom surface 401 and the cabinet bottom surface 172 within the range of the conditional expression (1). Reduce, projection type display device PD
2 is the same as in the first embodiment.

<B-5. Modification> In the above description, as shown in FIG. 9, the projector 500 arranges the light source 1 below the optical axis from the dichroic mirror 14rg to the projection lens 4 in FIG. As shown in FIG. 9, an example is shown in which most of the width dimension Wp of the housing 400 is distributed to the left side of the screen 5 from the center of the screen 5, but the dichroic mirror 14rg shown in FIG. Even if the configuration is such that each component is arranged on the opposite side with the optical axis reaching as the symmetric axis, that is, the configuration in which the light source 1 is arranged above the optical axis in the figure, the effect of the present invention is still different. Absent.

[0082]

According to the projection display device of the first aspect of the present invention, the central axis of the image light from the housing to the image light reflecting means, and the projection from the image light reflecting means to the projection light reflecting means. Since the projection means is arranged such that the central axis of the light and the central axis of the projection light from the projection light reflection means to the transmissive screen are defined in one plane, the image on the image display device and the projection light are The vertical and horizontal directions of the image at the time of screen projection can be matched.

According to the projection display device of the second aspect of the present invention, when the transmissive screen is arranged so that its long side is horizontal, the image display device is arranged in accordance with it. In the case where the wiring cable extends from one of the long sides of the image display device, the cable is prevented from blocking the optical path in the housing, and the length of the wiring cable can be reduced, thereby reducing the influence of noise. It is hard to receive.

According to the projection type display device of the third aspect of the present invention, the projection means is arranged such that the bottom surface of the housing portion makes a predetermined angle of not more than 20 degrees with respect to the horizontal plane.
The angle formed between the projection light reflecting means and the transmission screen can be made gentle, and the height of the apparatus can be reduced.

According to the projection type display device of the fourth aspect of the present invention, the predetermined angle formed by the bottom surface of the housing with respect to the horizontal plane is 0 degree, so that the projection means can be easily arranged. In addition, the height dimension and the depth dimension of the device can be properly balanced.

According to the projection display device of the fifth aspect of the present invention, since the projector further includes position adjusting means for moving the projection unit in the horizontal and vertical directions between the housing and the projection unit. The optical axis of the lens system included in the projection unit can be moved in the horizontal and vertical directions with respect to the central axis of the image light in the body, and the position of the projected image on the projection screen in the screen plane can be adjusted. Therefore, when installing the projection means in the apparatus, only the in-plane rotation direction of the projection image needs to be adjusted to the screen, and the work of arranging the projection means becomes easy.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a projection display device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a projector constituting the projection display device according to the first embodiment of the present invention.

FIG. 3 is a perspective view illustrating an operation of the projection display device according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a liquid crystal panel built in a projector constituting the projection display device according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of a projection lens of the projector that constitutes the projection display device according to the first embodiment of the present invention.

FIG. 6 is a cross-sectional view when the projection lens of the projector constituting the projection display device according to the first embodiment of the present invention moves.

FIG. 7 is a diagram illustrating a mechanism for moving a projection lens of a projector that constitutes the projection display apparatus according to the first embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of a projection display apparatus according to a second embodiment of the present invention.

FIG. 9 is a diagram illustrating a projector constituting a projection display device according to a second embodiment of the present invention.

FIG. 10 is a diagram showing a configuration of a conventional projection display device.

FIG. 11 is a diagram illustrating a projector that constitutes a conventional projection display device.

FIG. 12 is a perspective view illustrating an operation of a conventional projection display device.

FIG. 13 is a diagram showing a liquid crystal panel built in a projector constituting a conventional projection display device.

[Explanation of Signs] 3, 3R, 3G, 3B liquid crystal panel, 4 projection lens,
41 first folding mirror, 5 transmission screen,
160 second folding mirror, 200, 400 enclosure, 300, 500 projector.

Claims (5)

[Claims] 1. An image display device, comprising: a housing for emitting image light from the image display device; and a projection unit for enlarging and projecting the image light, and displaying the image light on the image display device. Projection means for enlarging and projecting the projected image, projection light reflection means for reflecting the projection light emitted from the projection means, and a transmission screen for receiving the projection light reflected by the reflection means. In the apparatus, the projection unit has an image light reflection unit that reflects image light toward the projection light reflection unit, and the projection unit includes an image light from the housing to the image light reflection unit. , The central axis of the projected light from the image light reflecting means to the projected light reflecting means, and the central axis of the projected light from the projected light reflecting means to the transmissive screen are defined in one plane. Arranged as Projection-type display device. 2. The transmissive screen is rectangular and arranged so that long sides are horizontal. The image display device is rectangular and long sides are horizontal according to the arrangement of the transmissive screen. The projection display device according to claim 1, wherein the projection display device is arranged so as to be arranged as follows. 3. The projection device, wherein a central axis of the image light from the housing portion to the image light reflecting device and a central axis of the projection light from the image light reflecting device to the projection light reflecting device are orthogonal to each other. 2. The projection display device according to claim 1, wherein the bottom surface of the housing portion is arranged at a predetermined angle of not more than 20 degrees with respect to a horizontal plane. 4. The method of claim 3, wherein the predetermined angle includes 0 degrees.
The projection type display device according to the above. 5. The projection device according to claim 1, wherein the projection device further includes a position adjustment device for moving the projection unit in a horizontal and vertical direction between the housing unit and the projection unit. The projection type display device according to the above.