JP2601083B2 - Projection display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection display.

[0002]

Recently, as a display of the liquid crystal television receiver or the like for displaying an image using a dot matrix liquid crystal display device, disk re a display image of the liquid crystal display device
A projection display has been developed in which a display image of a liquid crystal display device having a small screen is enlarged and viewed by enlarging and projecting the image on a screen.

[0003] The projection type display, light is incident from a light source that illuminates the liquid crystal display device in Dots matrix liquid crystal display device, corresponding to the display image of the liquid crystal display light, that the liquid crystal display device emitted a device designed to project the screen by the light enlarged by the projection lens, generally TN (twisted nematic) type liquid crystal display device is used as the liquid crystal display device.

In this TN type liquid crystal display device, as is well known, a nematic liquid crystal is twisted substantially 90 degrees and sealed between a pair of transparent substrates having electrodes formed on opposing surfaces.
A polarizing plate is provided on each of the light incident surface and the light emitting surface of the N-type liquid crystal panel, and the polarizing plate on the light incident surface side of the liquid crystal panel is:
The liquid crystal in the liquid crystal panel is provided with a twist alignment with respect to the light transmission axis direction of the incident side polarizing plate as a reference for transmitting light in a predetermined vibration direction out of the light from the light source and causing the light to enter the liquid crystal panel. Have been.

The polarizing plate on the light emitting surface side of the liquid crystal panel is
An image in which a liquid crystal display device transmits light in an electric field application part and blocks light in an electric field non-application part, for transmitting a light in a predetermined vibration direction among light emitted from the liquid crystal panel and forming an optical image. In the case of a normally black type that performs display, the image forming polarizing plate on the light emitting surface side is provided with its light transmission axis direction parallel to the light transmission axis direction of the incident side polarizing plate. Is a normally white type that performs image display in which light is transmitted in an electric field non-applying portion and light is blocked in an electric field applying portion, the image forming polarizing plate has its light transmission axis direction set to the incident side polarizing plate. Are provided substantially orthogonal to the direction of the light transmission axis.

[0006] In a conventional projection display,
As the liquid crystal display device, a liquid crystal display device used in a direct-view display for observing a light emission surface of a liquid crystal display device as a screen is used.

In the liquid crystal display device used in the direct-view display, the incident-side polarizing plate and the image-forming polarizing plate on the light-emitting surface side are arranged such that the direction of the light transmission axis is relative to the upper and lower edges of the liquid crystal panel. In the liquid crystal display device in which the light transmission axis directions of both polarizing plates are set in such a manner that the display images are arranged in a direction of approximately 45 degrees, the direction in which the display image can be best viewed is perpendicular to the screen. The direction is slightly inclined to the lower edge of the screen.

On the other hand, the projection display has a screen.
As to observe the image projected on the lean side from the projection side, a screen Te and optically transparent rear projection screen <br/>, an image projected from the rear side to the screen <br /> while others observed from the surface side of the screen, the projection display that uses a rear projection screen, scan <br/> clean striped lens portion of the minute width are many present parallel to the surface forming a Renchikyu Centrale lens arranged, disk Li
By diffusing the Renchikyu Centrale lens light transmitted through the over down surface, a viewing angle is increased in the image projected on the screen.

[0009]

However, in a conventional projection type display, a liquid crystal display device includes a polarizing plate on a light incident surface side and a polarizing plate for image formation on a light emitting surface, the light transmission axis direction of which is liquid crystal. Since a liquid crystal display device for a direct-view display, which is provided at an angle of approximately 45 degrees with respect to the upper and lower edges of the panel, is used as it is, a lenticule in which vertical or horizontal stripe-shaped lens portions are arranged in parallel.
Image light projected the Centrale lens from its rear side to a rear projection screen formed on the surface above Renchikyu Centrale <br/> light vibrating direction shifted by about 45 degrees with respect to the width direction of the respective lens portions of the lens , and the therefore be poor light transmittance at screen in, we had a problem that an image looks the screen surface becomes dark.

[0010] This is due to the surface reflection at Renchikyu Centrale lens, the reflectivity of the screen incident light on the surface of the respective lens portions of Renchikyu Centrale lens, the incident light is vibrated in the width direction of the lens unit Although the smallest in the case of so-called P-polarized light, in the conventional rear projection display, almost light incident on the rear projection screen is the width direction of the lens portion of the lens <br/> Chikyu Centrale lens 45
For a light having a strong polarization characteristics in the direction of time, that much light transmittance becomes worse large surface reflectance at Renchiki <br/> Interview Centrale lens, the image that appears in the result screen surface Get dark.

[0011] Incidentally, the respective lens portions of the Renchikyu Centrale lens, by forming an oblique stripes inclined at approximately 45 ° in length direction with respect to the screen upper and lower edge, disk
The light transmittance can be increased by adjusting the width direction of the lens unit to the vibration direction of the lean incident light, but this results in an unnaturally distorted image in which the projected image extends in an oblique direction. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a rear projection in which a lenticular lens in which vertical or horizontal stripe-shaped lens portions are arranged in parallel on a surface. It is an object of the present invention to provide a projection display which can use a projection screen to make a projected image to be viewed a bright image with high luminance.

[0013]

SUMMARY OF THE INVENTION A projection type display according to the present invention comprises a liquid crystal panel, a light source for illuminating the liquid crystal panel, and a lenticular lens on the surface of which a number of vertical or horizontal stripe-shaped lens portions are arranged in parallel. A formed light-transmissive rear projection screen, a projection lens for enlarging and projecting light emitted from the liquid crystal panel onto the screen,
An incident-side polarizing plate that is disposed between the liquid crystal panel and the light source and transmits light in a predetermined vibration direction out of the light from the light source and enters the liquid crystal panel; and a projection image observer from the surface of the screen . An image forming polarizing plate that is arranged before reaching the eyes and transmits light in a predetermined vibration direction among light transmitted through the screen and forms an optical image,
And said image forming polarizing plate that is provided in a direction substantially perpendicular to the light transmission axis direction with respect to the length direction of the lens portion of the lenticular lens of the screen surface
It is a feature. In the present invention, the light transmission axis direction of the incident-side polarizing plate is the vibration direction of the light that becomes the light image of the light emitted from the liquid crystal panel and incident on the screen. It is more desirable to set the direction substantially perpendicular to the length direction of the lens portion .

In the projection type display of the present invention,
The image forming polarizing plate is, for example, a rear projection screen
Placed on the surface of the image or projected by the observer
It may be provided on the glasses.

Further, in the projection type display of the present invention,
When the liquid crystal panel is a TN type liquid crystal panel,
Adjust the direction of the light transmission axis of the entrance-side polarizing plate to the screen surface.
Almost along the length direction of the lens part of the lenticular lens
Provided perpendicular or parallel to the liquid crystal panel
Liquid crystal with reference to the light transmission axis direction of the incident side polarizing plate
What is necessary is just to twist-orientate.

Further, the projection type display of the present invention has
The projection optical path from the projection lens to the screen is
With at least one mirror, the light passing through the projection lens is
A refracted light path reflected by the mirror and guided to the screen.
In that case, the mirror may be placed on a screen
To the width direction of the lens part of the lenticular lens on the surface
Is parallel and the length of the lens portion of the lenticular lens
It is desirable to provide it inclining with respect to the vertical direction.

[0017]

That is, the projection type display of the present invention comprises an image forming polarizing plate for forming an optical image by transmitting light in a predetermined vibration direction out of the light emitted from the liquid crystal panel.
From the surface of the scene to the eyes of the projected image observer
For example, on the surface of a rear projection screen or projected image
The LCD panel can be mounted on the glasses worn by the observer.
The emission was light transmitted through the screen is projected from the rear side to the screen by the projection lens, in which so as to observe an image through the imaging polarizer.

In this projection type display, the distance from the surface of the screen to the eyes of the projected image observer is increased.
The polarizing plate for image formation is arranged between the two, and the direction of the light transmission axis of the polarizing plate for image formation is substantially perpendicular to the length direction of the lens portion of the lenticular lens on the screen surface. Direction, so that the projection light
After passing through the screen, it is incident on the polarizing plate for image formation
With the lenticular lens of the light
Light vibrating in the width direction of the lens unit, that is, the screen
The light in the vibration direction transmitted through at a high transmittance is used for the image forming.
Since the light image is transmitted through the polarizer, the projected image
The image becomes a bright image with high luminance. In addition, this projection type
In the display, the light transmission axis direction of the incident-side polarizing plate provided between the liquid crystal panel and the light source may be set to the optical image of the light emitted from the liquid crystal panel and incident on the screen, as in the above-described desirable configuration. If the vibration direction of the light is set in a direction that is substantially perpendicular to the length direction of the lens portion of the lenticular lens on the screen surface ,
The light that becomes the light image is transmitted through the screen with high transmittance.
Incident on the polarizing plate for image formation,
Shadow image, the transmittance in the screen are formed at the highest light, the higher luminance bright image.

In this projection type display, a liquid crystal panel
When the panel is a TN type liquid crystal panel, the liquid crystal panel and
The incident-side polarizing plate disposed between the light source, is provided with the light transmission axis direction or parallel to substantially perpendicular to the length direction of the lens portion of Renchikyu Centrale lens of screen surfaces, in the liquid crystal panel If the liquid crystal is twisted with reference to the direction of the light transmission axis of the incident-side polarizing plate, the light emitted from the electric field application unit of the liquid crystal panel ( the light in the vibration direction transmitted through the incident-side polarizing plate) and the electric field of the liquid crystal panel are Outgoing light from non-applied section
Of the two direction of the vibration direction of the light and (almost 90 degrees rotatory light), one vibration direction of the light, the width of each stripe-shaped lens portion of the lens <br/> Chikyu Centrale lens of the screen surface disk Li as the smallest P-polarized light surface reflectance vibrating in a direction
Since entering the over emissions, light of the vibration direction is transmitted through the <br/> screen with high transmittance.

The liquid crystal panel is a TN type liquid crystal panel.
In this case, the light transmission axis direction of the incident side polarizing plate may be selected depending on whether the image observed through the image forming polarizing plate is a normally black image or a normally white image. If the image and the image of the normally black, the light substantially perpendicular to the direction (imaging polarizing plate with respect to the length direction of the lens portion of Renchikyu Centrale lens of the screen surface the light transmission axis of the incident side polarizing plate Normal to the above image)
If the image of the over-white, the length direction parallel to the direction of the lens portion of the Renchikyu Centrale lens optical transmission axis direction of the incident side polarizing plate (perpendicular to the optical transmission axis direction of the imaging polarizer) do it.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a projection display used as a liquid crystal television receiver.
This will be described with reference to FIGS.

FIG. 1 is a vertical sectional side view of a projection type display. In FIG. 1, reference numeral 1 denotes a display case . The case 1 is formed in a box shape having a horizontally oblong display windows of a large area nearly upper half of the front, the said display window, a rear projection screen 2 of the light-transmissive are provided .

[0023] The rear projection screen 2 is, as shown in FIGS. 5 and 6 showing an enlarged portion thereof, on the surface (outer surface) of the transparent thin plate made of an acrylic resin or the like, stripe-shaped lenses minute width Renchikyu ra part 3a many aligned in the parallel
To form the over lenses 3, the back surface of the transparent thin plate (inner surface) to form a Saki Interview La Fresnel lens 4 to the substantially vertical beams of the projection light to the screen 2 with respect to the screen surface but, Renchiki <br/> Interview Centrale lens 3 of the screen surface is as that forming the respective lens portions 3a in a vertical stripe shape.

On the other hand, in FIG. 1, reference numeral 5 denotes a liquid crystal panel provided at a lower portion in the case 1 for displaying a television image. The liquid crystal panel 5 is, for example, a TN type. This TN-type liquid crystal panel 5 has a nematic liquid crystal between a pair of transparent substrates having electrodes formed on opposing surfaces.
0 degrees is twisted which was sealed by the incident side polarizer 6 is disposed on the light incident side of the liquid crystal panel 5.

Reference numeral 7 denotes a polarizing plate for forming an image. The polarizing plate 7 for forming an image is provided on the surface of the screen 2 . This image forming polarizing plate 7 is used for the liquid crystal panel 5.
Is transmitted through a predetermined vibration direction of the light of the emergent light forms a light image, Renchikyu Centrale the imaging polarizer 7 which is forming the light transmission axis direction on the surface of the rear projection screen 2 Direction (horizontal direction) substantially perpendicular to the length direction of the vertical stripe-shaped lens portion 3a of the lens 3
The TN type liquid crystal display device is constituted by the image forming polarizing plate 7, the liquid crystal panel 5, and the incident side polarizing plate 7.

Reference numeral 8 denotes a light source for illuminating the liquid crystal panel 5. Although the inside of the light source 8 is not shown, a high-intensity light source lamp such as a halogen lamp or a xenon lamp and a parabolic mirror reflector for reflecting light emitted from the light source lamp as parallel light are provided in a light source box. has a structure has, the light source 8 is provided in a position to irradiate the liquid crystal panel 5 via the light source side mirrors 9 of the cold mirror.

[0027] Here, what so as to be incident on the liquid crystal panel 5 by reflecting illumination light from the light source 8 in mirror 9, the optical path length from the light source 8 to the liquid crystal panel 5 is sufficient (liquid crystal panel It is desirable to arrange the light source 8 sufficiently away from the liquid crystal panel 5 so that the liquid crystal in the liquid crystal 5 is not affected by the radiant heat from the light source 2). This is to make the depth length of the entire display smaller than in the case where the display is arranged to face.

Further, the incident side polarizing plate 6 arranged on the light incident side of the liquid crystal panel 5, the light source-side mirror 9 from the light source 8
In the present embodiment, the light in the predetermined vibration direction is transmitted through the illumination light and is incident on the liquid crystal panel 5. It is provided in a direction (the optical transmission axis parallel to the direction of the imaging polarizer 7)) which is substantially perpendicular to the length direction of the lens portion 3a of Renchikyu Centrale lens 3 lean surface.

The liquid crystal in the liquid crystal panel 5 is aligned with the direction of the light transmission axis of the incident side polarizing plate 6 (the orientation of the liquid crystal molecules on the light incident side substrate surface is the direction of the light transmission axis of the incident side polarizing plate 6). Liquid crystal display device 5 which is twisted by approximately 90 degrees (parallel with the liquid crystal panel 5) and is constituted by a liquid crystal panel 5, an incident side polarizing plate 6 and an image forming polarizing plate 7.
To display a normally black image.

FIGS. 2A to 2C show the incident side polarizing plate 6.
The figure shows the direction of vibration of light passing through the liquid crystal panel and the direction of vibration of light incident on the liquid crystal panel 5 and light emitted therefrom.
The light transmitted through the liquid crystal layer of FIG.
As shown by a solid line in (c), the incident light transmitted through the incident-side polarizing plate 6 is emitted as light having the same vibration direction as that of the incident light. As described above, the light is emitted as light in a vibration direction rotated by approximately 90 degrees with respect to the vibration direction of the incident light.

It should be noted, Mi La light from the light source 8 as described above
If to be incident on the liquid crystal panel 5 through the over 9, the reflectance of the light obliquely incident on the mirror surface <br/> has differences by the vibration direction of the incident light, and Mi along the optical axis of the incident reflected light The light that oscillates in a direction perpendicular to the plane (the paper plane in FIG. 1) perpendicular to the plane, ie, the S-polarized light, has the highest reflectance.

[0032] Therefore, when a substantially orthogonal direction, that the horizontal light transmission axis direction of the incident side polarizing plate 6 of the liquid crystal panel 5 to the lens portion length direction of Renchikyu Centrale lens 3 as described above, the light source side Mi Rah 9, parallel to and incident-side polarization plate 6 with respect to the light transmission axis of the incident side polarization plate 6
Provided with by a predetermined angle inclined relative to the direction perpendicular to the light transmission axis of the may be arranged to light source 8 as shown so as to face the mirror 9. The light source side
By providing a color 9, because the highest reflectance of the vibration direction of light of the light reflected by the mirror 9 is light transmitted through the incident side polarizer 6, the mirror 9 toward the light source is provided The loss of light due to this can be prevented.

In FIG. 1, reference numeral 10 denotes a liquid crystal panel 5.
A forward light collecting lens consisting placed Saki Interview la Fresnel lens (light emitting side), the projection lens disposed in front of the condenser lens 10 11, exits the liquid crystal panel 5
(Horizontal polarized light is light emitted electric field applying unit, an electric field perpendicular polarized an output light of the non-applied portion) morphism and light is focused on the projection lens 11 by the condenser lens 10, by the projection lens 11 , of the first and the second two of the projection mirror 1
Through the projection optical path A provided with
The image is enlarged and projected onto the lean 2 from the rear side.

The two projection Mi La constituting the projection optical path A
Of over 12, the second projection mirror 13 is disk Lee
It is a mirror of large area close to the area of emission 2, the second projection mirror 13 is arranged to face the back of the screen 2 on the rear surface side of the case 1. The first projection mirror 12, the front side of the case 1, the screen 2
Of is positioned downward, it is arranged so as to face the second projection mirror 13.

[0035] Each of the projection mirror 12 and 13, respectively, of Renchikyu Centrale lens 3 of the screen surface parallel to and of the Renchikyu Centrale lens 3 with respect to the width direction of the vertical stripe lens portion 3a of the lens portion 3a inclined with respect to the longitudinal direction (first projection mirror 12 is inclined obliquely upwardly, the second projection mirror 13 obliquely downward tilt) is provided by the liquid crystal panel 5 and the projection lens 11
Is to face the first projecting mirror 12 is arranged as shown in FIG. 1, a light source 8 and the light source-side mirror 9 is arranged in accordance with the arrangement orientation of the liquid crystal panel 5.

[0036] The light projected by the projection lens 11 is emitted to the liquid crystal panel 5, the first projection mirror 12 is reflected toward the second projection mirror 13, further disk by the second projection mirror 13 The light is reflected toward lean 2.

[0037] What is the refractive optical path for projecting this manner the projection optical path A from the projection lens 11 to the screen 2 by reflecting light by the projection mirror 12 to screen 2, in the longitudinal direction of the case 1 by reducing the distance between the screen 2 and the projection lens 11 in order to reduce the depth length of the entire display.

[0038] Thus, the liquid crystal panel 5 emits the light projected from the back side thereof to a rear projection screen 2 through the projection optical path A by the projection lens 11, the screen 2
And is converted into image light by the image forming polarizing plate 7 provided on the surface of the screen 2 and is observed by an observer.

That is, in the projection type display, the image forming polarizing plate 7 for forming a light image by transmitting light in a predetermined vibration direction out of the light emitted from the liquid crystal panel 5 is projected on the rear side.
By providing the surface of the shadow type screen 2, a rear projection disk Lee by the projection lens 11 emerging from the liquid crystal panel 5
The light is projected passes through the screen 2 to down 2 from the back side, in which so as to observe an image through the imaging polarization plate 7.

In this projection type display, as described above, the incident side polarizing plate 6 on the light incident side of the liquid crystal panel 5 is used.
A Renchikyu La screen surface the light transmission axis direction
Provided substantially are perpendicular to the length direction of the lens portion 3a of the over lenses 3, since by twisted liquid crystal in the liquid crystal panel 5 a light transmission axis of the incident side polarization plate 6 as a reference,
The screen 2, the light emitted electric field applying part of the liquid crystal panel 5
A horizontal polarized light a is, the liquid crystal panel 5 of the electric field non-application portion
Light in two directions of vibration with vertically polarized light b, which is emitted light, enters as shown in FIGS.

[0041] Of the two directions of the vibration direction of the light, the horizontal polarized light a is disk as the smallest P-polarized light surface reflectance which vibrates in the width direction of the lens portion 3a of Renchikyu Centrale lens 3 is screen surface enters the lean 2, the vertical polarized light b is incident on the screen 2 as the Renchikyu Centrale largest S-polarized light surface reflectance which vibrates in the longitudinal direction of the lens portion 3a of the lens 3.

[0042] Incidentally, in FIG. 5, P and S are disk Li
3 shows the directions of vibration of the light beams a and b incident on the beam 2. Therefore, Come to about the horizontal polarized light a, disk Lee
Light a reflected in three planes Renchikyu Centrale lens of emission surface '(see FIG. 5) is a small amount of almost negligible, since the horizontal polarized light a is transmitted through the screen 2 at a high transmittance, if it is provided for the image forming polarizing plate 7 in a direction substantially perpendicular to the light transmission axis direction with respect to the length direction of the lens portion 3a of Renchikyu Centrale lens 3, disk
Of the light transmitted through the lean 2, light in a vibration direction having a high transmittance is transmitted through the image forming polarizing plate 7 to become image light as shown in FIG.

[0043] Thus, the image viewed through the imaging polarization plate 7 is an image in which the transmittance is formed at the highest light in the screen 2. The vertical polarized light b of the light incident on the screen 2, the screen transmission for light b reflected at the wrench <br/> particulate Centrale lens 3 side of the screen surface '(see FIG. 5) is large Although rates are low, the vertical polarized light in order to be light is blocked by the final imaging polarizing plate 7, the screen transmissivity of the vertical polarized light b is not a any problem.

[0044] In the above projection type display, a projection mirror 12 and 13 constituting the projection optical path A, the width direction of the stripe-shaped lens portion 3a of Renchikyu Centrale lens 3 of the screen <br/> surface parallel to and above Renchikyu error
Since is provided to be inclined with respect to the length direction of the lens portion 3a of the lenses 3, the projection mirror 12 and 13, the lens <br/> Chikyu Centrale width of each stripe-shaped lens portion 3a of the lens 3 The light oscillating in the direction, that is, the horizontally polarized light a is reflected at the highest reflectance.

Thus, of the light from the liquid crystal panel 5,
The light oscillation direction that is the image light by the image forming polarizing plate 7 passes through the screen 2 at the highest transmittance, the projection Mi La
It can be projected screen 2 is reflected efficiently by over 12.

Then, in this projection type display,
Is a polarizing plate for image formation on the surface of the rear projection screen 2.
7 and the image forming polarizing plate 7 is
Lenticular lens on the screen surface
Direction substantially orthogonal to the length direction of the lens portion 3a of the lens 3
, Projection light impinges on the screen 2
After being transmitted, the light enters the image forming polarizing plate 7 and
The lens portion of the lenticular lens 3 of the light
Light vibrating in the width direction of 3a, that is, the screen 2
The light in the vibration direction transmitted at the transmittance passes through the polarizing plate 7 for image formation.
Since it is transmitted and becomes an optical image, while using a rear projection type screen in which a lenticular lens in which stripe-shaped lens parts perpendicular to the surface are arranged in parallel,
The observed projected image can be a bright image with high luminance. Furthermore, in this projection type display,
As described above, the incident side polarization provided between the liquid crystal panel 5 and the light source 8
The direction of the light transmission axis of the light plate 6 is adjusted by
Of the light incident on the lean 2, the light
The moving direction is the level of the lenticular lens 3 on the screen surface.
Direction that is substantially perpendicular to the length direction of the lens portion 3a.
Light, which becomes the light image,
The light passes through the lean 2 at a high transmittance to the image forming polarizing plate 7.
The incident image is projected onto the screen 2
Higher brightness formed by the light with the highest transmittance in the
A bright image can be obtained.

Further, in the projection type display, since the image forming polarizing plate 7 is arranged on the surface of the rear transmission screen 2, for example, external light such as room illumination light is incident on the surface of the screen 2. Even so, the external light can be absorbed by the image forming polarizing plate 7, and therefore, the external light is reflected on the screen surface, making it difficult to view the displayed image.
That it is not.

In the above embodiment, a TN type liquid crystal panel in which liquid crystal is twisted by approximately 90 degrees is used as the liquid crystal panel 5. In this liquid crystal panel, the twist angle of the liquid crystal is increased ( For example, about 270 degrees) ST
An N-type liquid crystal panel may be used.

[0049] Also in the above embodiment is to form the lens portion 3a Les <br/> Nchikyu Centrale lens 3 of the screen surface in a vertical stripe shape, a lens portion 3a of the Renchikyu Centrale lens 3, the horizontal In this case, the light transmission axis of the image forming polarizing plate 7 may be used.
The direction may be vertical.

In this case, the liquid crystal panel 5 is a TN type liquid.
Crystal panel, which is observed through the polarizing plate 7 for image formation.
Images are normally black images (but black and white images)
Image or full-color image), the direction of the light transmission axis of the incident-side polarizing plate 6 is set to the vertical direction, and the liquid crystal of the liquid crystal panel 5 is twisted with reference to the direction of the light transmission axis of the incident-side polarizing plate 6. And each projection mirror in the projection optical path A
What is necessary is just to arrange | position the mirrors 12 and 13 in the attitude | position (diagonal horizontal attitude | position) which changed the 90-degree angle from the said Example.

In the above embodiment, the image observed through the image forming polarizing plate 7 is a normally black image.
It has been described that the image, the observation image is no
It may be a Mary White image, in which case the LCD
When the panel 5 is a TN type liquid crystal panel, the incident side polarizing plate 6 is provided so that its light transmission axis direction is substantially orthogonal to the light transmission axis direction of the image forming polarizing plate 7.
LCD with is twisted relative to the light transmission axis of the incident side polarizer 6 to the inner, the light source-side mirror 9, the light reflectance of the same vibration direction as the light transmission axis direction of the incident side polarizer 6 is most It provided so that higher, may be arranged a light source to face the light source side mirror.

Further, in the above embodiment, the incident side polarizing plate 6
Although arranged on the light incident surface of the liquid crystal panel 5, the incident-side polarization plate 6 may be arranged in any position as long as between the liquid crystal panel 5 and the light source 8, also the light source light from 8 may be caused to enter the liquid crystal panel 5 via a direct incident side polarizer 6 without providing the source-side mirror 9, also the projection optical path a from the projection lens 11 to the screen 2 it may be a straight path without the projection mirror 12.

In the above embodiment, the polarizing plate for image formation is used.
7 is provided on the surface of the screen 2.
Polarizing plate 7 is projected from the surface of screen 2
It can be placed in any position up to the eyes.
For example, as in the other embodiment shown in FIG.
It may be provided on glasses (not shown) worn by the observer. What
The projection display shown in FIG.
The light plate 7 is provided on the glasses worn by the projected image observer.
However, is the other configuration the same as the above-described embodiment?
Therefore, the same description is given the same reference numerals in the drawings and will not be repeated.

In the above embodiment, the display cable
Showed in front of the scan 1 that provided a rear projection screen 2, the present invention is to the screen from the display case can be separately and apply to a projection type display arranged in front, also TV not limited to a television receiver, Lower
It is of course also available on the display of the de-processor or computer.

[0055]

According to the projection display of the present invention,
From the surface of the rear projection screen to the eyes of the projected image viewer
While placing the image forming polarizing plate before reaching,
Since this image forming polarizing plate is provided with its light transmission axis direction substantially perpendicular to the length direction of the lens portion of the lenticular lens on the screen surface , the projection light
Enters the image forming polarizing plate after passing through the screen.
The lenticular rays of the light
Light that vibrates in the width direction of the lens portion of the lens,
The light in the vibration direction transmitted through the lean with high transmittance is the image
Since the light image is transmitted through the polarizing plate for formation, a projected image to be observed is used while using a rear projection screen in which a lenticular lens in which stripe-shaped lens portions perpendicular to the surface are arranged in parallel is used. A bright image with high luminance can be obtained. Further, the projection type disk of the present invention is used.
In play, provided between the liquid crystal panel and the light source
Change the direction of the light transmission axis of the incident side polarizing plate out of the liquid crystal panel.
Of the light incident on the screen,
Lenticular lens whose vibration direction is the screen surface
Direction that is almost perpendicular to the length direction of the lens part of
If it is set to the light, the light that becomes the light image
Is transmitted at a high transmittance and is incident on a polarizing plate for image formation.
The projected image to be observed is transmitted through the screen 2
Brighter, brighter images formed with the light with the highest percentage
It can be.

[Brief description of the drawings]

FIG. 1 is a vertical side view of a projection display according to an embodiment of the present invention.

FIG. 2 is a diagram showing a vibration direction of light transmitted through an incident-side polarizing plate, and a vibration direction of light incident on a liquid crystal panel and light emitted therefrom.

FIG. 3 shows a vibration direction of the light incident on the screen.

FIG. 4 is a diagram illustrating a vibration direction of light transmitted through a polarizing plate for image formation.

FIG. 5 is an enlarged sectional view taken along line VV of FIG. 1;

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5;

FIG. 7 is a projection display according to another embodiment of the present invention .
FIG.

[Explanation of symbols]

1 ... case, 2 ... rear projection screen, 3 ... Renchiki <br/> Interview Centrale lens, 3a ... striped lens unit, 4 ... Sir
Queue la Fresnel lens, 5 ... liquid crystal panel, 6 ... incident side polarizing plate, 7 ... imaging polarizer, 8 ... light source, 9 ... light source side Mi
Ra, 10 ... condenser lens, 11 ... projection lens, A ... projection optical path, 12, 13 ... projection mirror.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H04N 5/74 H04N 5/74 K

Claims (6)

(57) [Claims] 1. A liquid crystal panel and illuminating the liquid crystal panel.
Many light sources and vertical or horizontal striped lens parts
Several parallel lenticular lenses formed on the surface
A light-transmissive rear projection screen and the liquid crystal panel
Projection lens for enlarging and projecting the emitted light onto the screen
And the light disposed between the liquid crystal panel and the light source.
By transmitting light in a predetermined vibration direction out of the light from the source, the liquid
Incident-side polarizing plate for entering a crystal panel, and the screen
Placed between the surface of the camera and the projected image
Out of the light transmitted through the screen,
And an image forming polarizing plate for forming an optical image by transmitting light therethrough.
And the image forming polarizing plate has a light transmission axis direction.
The lenticular lens of the screen surface of the lens
To the direction almost perpendicular to the length direction of the
And a projection display. 2. The liquid crystal display according to claim 1 , wherein the direction of the light transmission axis of the incident side polarizing plate is set to the liquid crystal direction.
Of the light exiting the panel and entering the screen
The vibration direction of the light that becomes the light image is on the screen surface.
Almost along the length direction of the lens part of the lenticular lens
A contractor characterized by being set in a direction that is orthogonal to the direction.
The projection display according to claim 1. 3. The image-forming polarizing plate is a rear projection type screen.
2. The device according to claim 1, wherein
3. The projection display according to 2. 4. A polarizing plate for image formation, wherein a projection image viewer
2. The method according to claim 1, wherein
3. The projection display according to 2. 5. The liquid crystal panel is a TN type liquid crystal panel.
The light-transmitting polarizing plate has its light transmission axis direction aligned with the screen surface.
Almost perpendicular to the length of the lens
The liquid crystal panel,
The liquid crystal inside is based on the light transmission axis direction of the incident side polarizing plate.
3. The semiconductor device according to claim 2 , wherein
The projection type display according to the above. 6. A projection optical path from a projection lens to a screen.
Passes through the projection lens with at least one mirror.
The reflected light is reflected by the mirror and guided to the screen.
The light path is a folding light path, and the mirror is provided on the screen surface.
Flat in the width direction of the lens part of the lenticular lens
Line and the length of the lens part of the lenticular lens
It is characterized by being provided at an angle to the direction
The projection display according to claim 1.