JPH02281287A - Projecting type display device - Google Patents

Abstract

PURPOSE:To achieve high accuracy, high definition, and high brightness by providing plural copying parts, plural display parts and a picture distributing part. CONSTITUTION:This display device has the picture distributing part 32 which divides video data on an original picture into plural video data groups and supplies them to the display parts 34. These display parts 34 form display pictures based on the video data obtained by dividing the original picture into plural parts. A projection area on the display picture screen of each display part 34 can be adjusted by the relative position between each display part 34 and the optical path of each projection lens. Consequently, when display pictures formed on the display parts 34 are projected on the screen via projecting parts 35 through the positional adjustment, the original picture is composed. Thus, a projected picture with high definition and high brightness can be obtained.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a projection display device, and is useful when an image displayed on a display section is enlarged and projected onto a large screen using an optical system. be.

<Prior Art> FIG. 16 is a principle diagram showing a projection type display device according to the prior art (see Japanese Patent Laid-Open No. 159120/1982). As shown in the figure, in this projection display device, light emitted from a light source 51 is collimated by a condenser lens 5L, passes through a display device 53 such as a liquid crystal light valve, and enters a projection lens 54. As a result, the display image formed on the display device 53 is projected onto the screen 5 by the projection lens 54.
5 and is enlarged and projected onto the screen.

<Problem that the invention seeks to solve> The above conventional technology has the following problems.

1) The definition of the projection display is determined by the definition of the display device 53, but the definition of the display device 53 is uniquely determined by the technology at that time, and higher definition cannot be achieved. 2) The brightness on the screen 55 is related to the brightness of the light source 51 and the size of the projection area, but the brightness of the light source 51 is limited due to the nature of the display device 53. However, due to this limitation, especially when displaying on a large screen, it may not be possible to provide sufficient brightness, and sufficient image quality may not be obtained on the screen 55.

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, it is an object of the present invention to provide a projection display device that can easily achieve high definition and high brightness.

Means for Solving the Problems> The configuration of the present invention that achieves the above object is as follows: In a projection type display device that projects and displays one original image, a plurality of display devices whose optical axes are arranged parallel to each other are provided. a plurality of projection function parts including a projection lens and a light source for forming a projected image on the screen via the projection lens; The positions relative to each optical axis are shifted in the direction perpendicular to each optical axis so that one original image is synthesized as a whole by shifting each, and display images obtained by reproducing video data are formed respectively. and an image distribution function unit that divides the video data of the original image into a plurality of video data groups and supplies them to each display function unit, and the optical axes are parallel to each other. A plurality of projection function sections including a plurality of disposed projection lenses and a light source for forming a projected image on a screen via the projection lenses, and a display image that is respectively enlarged and projected by each projection function section. The positions relative to each optical axis are shifted in the direction perpendicular to each optical axis so that one original image is synthesized as a whole by shifting the areas on the screen respectively, and the video data is played back. a plurality of display function parts each forming a display image to be obtained; a plurality of optical parts condensing the display image displayed on each display function part and making it enter a projection lens of each projection function part; It is characterized by having an image distribution function section that divides video data into a plurality of video data groups and supplies them to each display function section, respectively.

Effects> According to the present invention having the above configuration, the plurality of display function sections
Each display image is formed based on video data obtained by dividing the original image into a plurality of parts. On the other hand, the projection area of the display image of each display function section on the screen can be adjusted by the relative position of each projection lens of each display function section with respect to the optical axis.

Therefore, by projecting the display images formed on each display function section through the position adjustment onto the screen via the projection function section, the original image is synthesized.

Practical example Embodiments of the present invention will be described in detail below based on the drawings.

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

In the same figure, the video data of the original image is
This is a video signal such as R. The image distribution function section 32 arbitrarily divides the video data 31 of the original image into a plurality of parts, and displays the video data 33-1 to 33-n thus divided into a plurality of groups to the same number of display function parts 34-. ~34-n. Display function sections 34-8 to 34. For example, a display image is formed by reproducing an image based on video data 33-8 to 33-, which is an electric signal, such as a liquid crystal light valve that is a liquid crystal display or a CRT screen. Projection function section 35-1 to 3
5-n is provided corresponding to each display function section 34-1 to 34-n, and each display function section 34-. 34- are provided with a light source, a projection lens, etc., which will be described in detail later, so as to project the display images formed on the screens 37, respectively. The image synthesis function section 36 uses the output signal to control the display function sections 34-1 to 34-n and the projection function sections 35-1 to 35-.
n, and synthesizes the outputs of the projection function sections 35-1 to 35-n into a projected image of one original image on the screen 37.

Specifically, adjusting the relative positions of the display function units 34-1 to 34-o and the projection function units 35-1 to 35-n in a direction perpendicular to the optical axis, adjusting the illuminance of the light source, and focusing the projection lens. etc. By adjusting the relative position, each display function section 34-
The projection area on the screen 37 of each display image in 1 to 34-n is adjusted.

FIG. 2 is an explanatory diagram showing an optical system according to the first embodiment of the present invention using a light transmission type display function section. In the figure, reference numerals 1a to 1C are white light sources consisting of a halogen lamp or a xenon lamp and a reflector. Light from the light sources 1a to IC is condensed by an optical system consisting of condenser lenses 2a to 2Q and filters 3a to 3c for cutting infrared m and ultraviolet rays,
The visible light is parallel rays. Thus, the display function section 58
~5C harmful ultraviolet rays are cut by the filter 3, heat rays are also cut by the filter 3, and the light source 18
The heat generated directly from ~1c is sent to the outside by a fan or the like. The light that has passed through the filters 3a to 3C passes through optical filter sections 4a to 4C and is converted into desired light (for example, for adjusting the brightness value or dividing into monochromatic light in the case of color).

Projection lenses 9a to 9c are arranged so that their optical axes are parallel to each other, and are adapted to magnify and project the display images displayed on the display function sections 5a to 5C, respectively, onto the screen 10.

The display function sections 58 to 5c are transmissive display sections, such as liquid crystal light valves, that electrically form a display image corresponding to the original image, and are arranged perpendicularly to the optical axis of each projection lens 9a to 9C. has been done. Further, if the distance between the projection lenses 98 to 90 is d, since the projection lenses 9a to 9C are arranged in parallel, the optical axes are similarly separated by the distance d on the screen 10.

Thus, in order to align the display images of the display function sections 5a to 5C on the screen 10, the display function sections 5a and 5c, which are arranged at a distance d from the reference axis, are aligned by arrows as shown in FIG. It may be shifted in the directions A and B (perpendicular to the optical axis) according to the distance d and the image magnification rate m determined by the distance between the focal lengths of the projection lenses 9a to 9C and the screen 10.

Incidentally, if the display function parts 5a and 5c are shifted by a distance of 1 on the same plane, the projection areas of the display images of the display function parts 5a to 5C on the screen 10 will match. As shown in Part B, the display function units 5a to 5C with respect to the optical axes of the projection lenses 9a to 9C
By adjusting the position of each display function section 5a to 5.
The projection area of the display image c on the screen 10 can be independently adjusted and set as desired.

Note that the display function units 58 to 5C in FIG. 2 are the display function units 34-1 to 34-. ．． It corresponds to Similarly, light sources 1a to lc and condenser lenses 28 to 2c
, filters 3a to 3c.

The optical filter sections 48 to 4C and the projection lenses 98 to 9C together correspond to the projection function sections 35-1 to 35-n.

FIG. 3 is an embodiment of the invention shown in (2) of the claims, and is an explanatory diagram of an embodiment related to the first embodiment. In Fig. 3, the original image consisting of 16 pixels (■~@) (81 is a group of continuous pixels, (a)
, (b), (e) and (d). Each video data (a), (b), (c)
and (d) are each independently projected on the screen, and the fourth
The images are formed as (5), (B), (C), and (6) in the figure. By aligning these four images with each other, a projected image of the original image (FIG. 3(S)) can be obtained. This means that by using a plurality of low-definition display function sections, it is possible to effectively realize a display function section with higher definition (four times the definition in this embodiment). Furthermore, since there are a plurality of light sources (four in this embodiment), the illuminance per light source is four times as bright if the projected image of the same area is compared with the same light source.

In FIG. 4, the original image (Sl) is obtained by moving other images in the direction of the arrow based on (5), but the alignment at this time is based on the projection of the display function units 5a to 5C shown in FIG. Lens 98~
This is done by adjusting the position relative to 9C (but
In the case shown in FIG. 4, four display function sections and four projection function sections are of course required). That is, based on (5),
(6) to the right in the figure by the width of (in the horizontal direction)
Each display function section is moved vertically (downward in the figure by the vertical width of q, and p) is moved horizontally and vertically to the lower right in the figure by the horizontal and vertical widths of p. 34-1~34
- adjust the position with respect to the projection function sections 35-1 to 3j.

FIG. 5 is an embodiment of the invention shown in (3) of the claims, and is an explanatory diagram of another embodiment related to the first embodiment. In Figure 5, 16 pixels (■~@)
The original image (S) consisting of is a group of discontinuous pixels,
(a), (b).

It is divided into video data groups (e) and ld). Each video data (a), (b), +01 and (d) is projected onto the screen independently, and (8) and (8) in Fig. 6 are shown.
It is imaged as p(6) and (to). In Fig. 6, the shaded area is the displayed image area, which corresponds to the image area of ■~[phase], and the white area is the non-image area and is actually a dark area (ideally, it is a dark area). No dark part). That is,
The part B corresponds to a dark part of an actual pixel where an image is not displayed, which is always present because it is a black stripe in a CRT, or a wiring area in a liquid crystal display.

Note that in FIG. 6, in order to simplify the drawing, each display function section has four pixels, but in reality, each display function section has a large number of pixels.

Incidentally, FIG. 7 is an explanatory diagram showing an example of the pixel layout of an actual TPT (thin film transistor) type liquid crystal display. In FIG. 7, (,) indicates an effective pixel area through which light passes, (b) indicates a horizontal wiring area corresponding to a gate line, and (cl) indicates a vertical wiring area corresponding to a source line.

In this way, in the case of a TFT type liquid crystal display, the gate line,
Data lines are arranged vertically and horizontally in a matrix and T
Since there is a PT, there is an area where no video is displayed.

If this area is laid out in the same way as the area where light actually passes through (here, for the sake of clarity, it is assumed that light passes through a quarter of the pixel area), the projected image will look like Figure 6. become.

FIG. 8 shows the video data (5) of FIG. 6, 031. (Cl.

■)), and when they are adjusted and overlapped, it becomes (eye, (5)).Furthermore, (eye, (5)) are superimposed on each other (in the end, (5), (B), ( C) and (corresponding to superimposing DJs on each other) and (G), and the original image (S
) can be obtained. This means that, as in the case of FIG. 3, by using a plurality of low-definition display function sections, a higher-definition display function section (here, four times the definition) can be realized. In addition, in this embodiment, the video data (5) to p) are arranged at an interval a between pixels of the display function section.
The original images can be synthesized by moving the position of each display function section relative to each projection function section by an amount corresponding to
This amount of movement adjustment is not only small, but even if the projected image has variations in brightness and darkness due to differences in the characteristics of each display function part, the brightness of the multiple display function parts is averaged to the human eye. This eliminates the unnaturalness caused by compositing multiple screens, making it feel like a real object.

FIG. 9 is a block diagram showing the principle of a projection type display device according to a second embodiment of the present invention.

As shown in the figure, in this embodiment, each display function section 34-□
Optical sections 39-1 to 39-3 that condense display images for each ~34-o
9-n, and these optical parts 39-1 to 39-3
9- and 9- are adapted to adjust the relative position with respect to the projection function units 35 to 35 by the image synthesis function unit 38.

In FIG. 9, other parts are the same as those in FIG. 1, so the same parts are given the same numbers and redundant explanation will be omitted.

FIG. 10 is an embodiment of the invention shown in (5) of the claims, and is an explanatory diagram showing an optical system according to an embodiment related to the second embodiment. As shown in the same figure, in this embodiment, the optical parts 39-8 to 39-n in FIG.
It was formed using a to 6c. The condensing lenses 6a to 6c are arranged corresponding to each pixel of each display function section 5a to 5C, and collect images of pixels of these display function sections 5a to 5c for each display function section 5a to 5c. It is supposed to glow.

The other parts in FIG. 10 are the same as those in FIG. 2, so the same parts are given the same numbers and redundant explanations will be omitted.

FIG. 11 is an explanatory diagram showing an embodiment related to the second embodiment of the present invention shown in (5) of the claims, using the optical system shown in FIG. 10. In the figure, (a) shows the pixels of the display function section 5 (58 to 5c) and the condenser lens 6 (68 to 5c).
6c) is a diagram showing the relationship between P and P in the X direction of each pixel of the display function unit 5 (5a to 5c).

This is the pitch in the Y direction. In addition, P is the condenser lens 6 (
6a to 6C), and in this case, the pixel pitch and the lenticular lens pitch are made equal (p=p1). In Fig. 11, (b) is a display image for each pixel of the display function section 5 (5a to 5c), and &→ is a condensed image formed on the focal plane when passing through the condenser lens 6 (68 to 6c). (Here, it is assumed that the light is focused to 1/3 of the width and the image is formed at the center.) This condensed image (c) is projected onto a screen l through a projection lens 9 (one of 9a to 9c).

It is enlarged (b) at the top. (E) shows three enlarged displays (
An example will be shown in which one display is performed by shifting 1/3 pixel in the horizontal direction using (a)a, (c)b, and (c)c). That is, in this embodiment, the horizontal definition can be increased three times. Further, the brightness is improved three times compared to the case where the condenser lens 6 (6a to 6c) is not used.

FIG. 12 is an explanatory diagram showing a modification of the embodiment shown in FIG. 11 in which a flat plate microlens is used as the condensing lens 6. Similarly to FIG. 3 is a diagram showing the relationship between the condensing lenses 6 (however, in this example, four sets each of display function units and projection function units are required). FIG.

In FIG. 12(A), P, , P- are the pitches of the pixels of the display function section 5 in the X and Y directions, respectively, and Pl and P□ are the pitches of the flat microlenses in the X and Y directions, respectively. Here, the pixel pitch and the pitch of the flat microlenses are made equal (p,=p,, P,=p,). (b) is a display image for each pixel of the display function section 5. I/→
is a condensed image formed on the focal plane when the light passes through the condensing lens 6 (here, it is assumed that the light is condensed to 1/4 and the image is formed at the center). The condensed image → is enlarged and displayed on the screen 10 through the projection lens 9 (b). (E) shows four enlarged displays ((B) a.

An example will be shown in which one display is performed by shifting 1/4 pixel vertically and horizontally using 2)b, 2)C2(b)d).

In other words, in this modified example, the definition is doubled in both the vertical and horizontal directions (total of 4
It has been expanded to 2 times). Furthermore, the brightness is improved four times compared to the case where the condenser lens 6 is not used.

FIG. 13 is an embodiment of the invention shown in (6) of the claims, and is an explanatory diagram showing an optical system according to another embodiment related to the second embodiment. As shown in the figure,
In this embodiment, the optical parts 39-1 to 39-o in FIG.
It is formed by using condensing lenses 6a to 6C, which are lenticular lenses similar to those shown in FIG. 0, and other condensing lenses 78 to 7C corresponding to the condensing lenses 6a to 6C, respectively. These condensing lenses 7a to 7C are condensing lenses 68 to 6C.
The images of the pixels that have been focused respectively are focused as one image for each display function section 58 to 5C, and the image is formed in space.

In Fig. 13, the other part C is the same as Fig. io, so
Identical parts are given the same numbers and redundant explanations will be omitted.

FIG. 14 is an explanatory diagram illustrating another embodiment related to the second embodiment of the present invention shown in (6) of “Claims” using the optical system shown in FIG. 13. . In the figure, (A) is a diagram showing the relationship between the pixels of the display function section 5 (5a to 5c) and the first condensing lens 6 (6a to 6c), and Pw.

P is the X direction of each pixel of the display function unit 5 (5a to 5c),
This is the pitch in the Y direction. In addition, P is the first condensing lens 6
(6a to 6c) is the pitch of the lenticular lens, and in this case, the pixel pitch and the pitch of the lenticular lens are made equal (p=p,). In Figure 14,
(b) is a display image for each pixel of the display function section 5 (58 to 5c). (c) is the first condenser lens 6 (6a to 6C
(Here, it is assumed that the light is focused to 1/3 of the horizontal width and the image is focused at the center.) The first condensed image ←→ is reduced by the second condensing lens 7 (one of 7a to 7C) to generate a second reduced image (b). This second reduced image (b) is projected onto the screen 1 through the projection lens 9 (one of 9a to 9C).
0 is enlarged and displayed (e). (E) shows three enlarged displays ((E)a, (E)b).

An example is shown in which one display is performed by shifting 1/3 pixel in the horizontal direction using C). That is, in this example, the horizontal definition can be expanded three times. In addition, the brightness is determined by the condensing lens 6.
This is three times better than when (6a to 6c) are not used. Furthermore, according to this embodiment, since the display image incident on the projection lens 9 (9a to 9c) is reduced by the second condensing lens 7 (?a to 7c), the projection lens 9 (98 to 9
The diameter of c) can be made smaller.

FIG. 15 is an explanatory diagram showing a modification of the main unit shown in FIG. 14 in which a flat plate microlens is used as the first condensing lens 6. Similarly to FIG. 14, (a) is the display function section. 5 is a diagram showing the relationship between pixels No. 5 and the first condenser lens 6 (however, in this example, four sets each of display function units and projection function units are required).

In FIG. 15 (a), p, , p are display function parts 5
The pitch of each pixel in the X direction and Y direction is pl, p,
are the pitches of the flat microlenses in the X and Y directions, respectively. Here, the pixel pitch and the pitch of the flat microlenses are made equal (P, = P1. P, = P□). (b) is a display image for each pixel of the display function section 5. (c)
is the first image formed on the focal plane when passing through the first condensing lens 6.
(Here, it is assumed that the light is focused to 1/4 and the image is focused at the center.)

The first condensed image Q field is demagnified by the second condensing lens 7 to generate a second demagnified image.

This second reduced image (c) is enlarged and displayed on the screen 10 through the projection lens 9. (f) uses four enlarged displays ((f) a, kJb, htc, Th) d),
An example is shown in which one display is performed by shifting 1/4 pixel vertically and horizontally. That is, in this modified example, the definition can be doubled in both the vertical and horizontal directions (4 times in total). Furthermore, the brightness is improved four times compared to the case where the condenser lens 6 is not used. Furthermore, according to this embodiment, the aperture of the projection lens 9 can be made smaller, similar to the embodiment shown in FIG.

In addition, although the above-described embodiments have all been exemplified using a transmissive display function section, such as a liquid crystal light valve, as the display function section, the present invention is not limited to this. for example,
The display function section may also include a CRT display screen or the like. In this case, the light source portions of the display function section and the projection function section may be considered as an integrated unit built into the CRT.

<Effects of the Invention> As described above, the present invention has the advantage that a large screen or high-definition original image can be enlarged and projected by using a plurality of display function sections with lower definition. . In addition, by providing an optical part for condensing light between the display function part and the projection function part, the light that passes through each pixel of the display function part is collected by the lens and all of it is effectively projected onto the screen. , there is an advantage that multiple images can be synthesized without impairing the inherent brightness of the display function section. As a result, it is possible to achieve large-screen composition and high definition using multiple display function units, improve image quality (gradation display, color display) by simultaneously projecting multiple display function units, and realize high-speed projection images. A significant contribution can be expected.

Furthermore, the alignment of the image projected on the screen is
Since the display function section is configured to be moved in a direction perpendicular to the optical axis of the projection lens, position adjustment is also extremely easy. Furthermore, since the optical axes of the plurality of projection lenses are perpendicular to the screen, the image on the screen is not distorted into a trapezoid like in a CRT projection display device, and a high-definition image can be obtained even at the periphery of the screen.

All of the above has been explained assuming a monochrome display, but in the case of color, there are methods such as placing R, G, and B lights side by side in a screen shape, or projecting R, G, and B lights overlappingly on the same area of the screen. It is possible, but it can be considered in exactly the same way as in the case of monochrome.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the principle of a projection display device according to a first embodiment of the present invention, FIG. 2 is an explanatory diagram showing an optical system according to the first embodiment of the present invention, and FIG. and Figure 4 is the first
Explanatory diagrams showing examples related to the example, FIGS. 5 and 6
8 and 8 are explanatory diagrams showing another embodiment related to the first embodiment, FIG. 7 is an explanatory diagram showing an example of the layout of pixels of a thin film transistor type liquid crystal display, and FIG. FIG. 10 is an explanatory diagram showing an optical system according to an embodiment related to the second embodiment of the present invention, and FIGS.
13 is an explanatory diagram showing an embodiment related to the second embodiment of the present invention, FIG. 13 is an explanatory diagram showing an optical system according to another embodiment related to the second embodiment of the present invention, and FIG. 15 and 15 are explanatory diagrams showing other embodiments related to the second embodiment of the present invention, and FIG. 16 is an explanatory diagram showing a conventional technique. In the drawing, 1a to 1c are light sources, 58 to 5c, 3j1 to 34-n are display function units, and 6a to 6
c, 7a to 7c are condensing lenses, 9a to 9c are projection lenses, 10.37 is a screen, 31 is display data, 32 is an image distribution function section, 35-1 to 35-o are projection function sections, 39-1 ~39-o is an optical section.

Claims (6)

[Claims] (1) In a projection display device that projects and displays a single original image, a projected image is formed on a screen through a plurality of projection lenses and projection lenses arranged so that their optical axes are parallel to each other. and a plurality of projection function units including a light source for each projection function unit, and each projection function unit shifts the area on the screen of the display image enlarged and projected by each projection function unit, respectively, so that one original image is synthesized as a whole. A plurality of display function sections are arranged such that their positions relative to the optical axis are shifted in a direction perpendicular to each optical axis, and each of them forms a display image obtained by reproducing video data; 1. A projection type display device comprising an image distribution function unit that divides the video data into groups and supplies the data to each display function unit. (2) The projection type display device according to claim (1), wherein the image distribution function section divides the video data of the original image into a plurality of video data groups as a group of continuous pixels. (3) The projection type display device according to claim (1), wherein the image distribution function section divides the video data of the original image into a plurality of display data groups as groups of discontinuous pixels. (4) In a projection display device that projects and displays a single original image, a projected image is formed on a screen through a plurality of projection lenses and projection lenses arranged so that their optical axes are parallel to each other. and a plurality of projection function units including a light source for each projection function unit, and each projection function unit shifts the area on the screen of the display image enlarged and projected by each projection function unit, respectively, so that one original image is synthesized as a whole. A plurality of display function parts are arranged such that their positions relative to the optical axis are shifted in a direction perpendicular to each optical axis, and each display function part forms a display image obtained by reproducing video data. A plurality of optical sections that collect the display image and make it enter the projection lens of each projection function section, and an image distribution function that divides the video data of the original image into a plurality of video data groups and supplies them to each display function section. A projection display device comprising: (5) The optical section is composed of a plurality of condensing lenses arranged corresponding to each pixel of each display function section and condensing images of pixels of each display function section for each display function section. A projection type display device according to claim (4), characterized in that: (6) The optical section includes a plurality of condensing lenses arranged corresponding to each pixel of each display function section and condensing images of pixels of each display function section for each display function section; A projection type display device comprising a plurality of other condensing lenses that form the entire image generated by each of these condensing lenses in space for each display function section.