JPH1185039A - Picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picture display device from which a high brightness display picture is obtained by efficiently using radiated light. SOLUTION: When pictures on screens in a 1st and a 2nd display modes of which the number of vertical picture elements and the number of horizontal picture elements each are specified to be approximately equal are displayed by individually changing them over to each other, the display area is irradiated with light by using the liquid crystal display element 5 adopting a more number of picture elements as horizontal and vertical picture element arrays, comparing the numbers of horizontal and vertical picture elements with each other in the 1st and 2nd display modes. The liquid crystal display element 5 is driven by picture signals corresponding to a picture on the screen in the selected mode subject to be an display object. When picture information light of a screen in a display mode with a different aspect ratio of the display area on the liquid crystal display element 5 is emitted from the liquid crystal display element, the picture to be an object for display, both pictures on the screens in the 1st and a 2nd display modes are displayed without distortion by inserting an anamorphic optical system in the light path of the emitted light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to individually switch and display images in two display modes in which the number of pixels in the horizontal direction and the number of pixels in the vertical direction are substantially the same and the aspect ratios are different. The present invention relates to an image display device.

[0002]

2. Description of the Related Art In an active matrix liquid crystal display element on which irradiation light emitted from a light source is incident, a two-dimensional display mode in which the number of pixels in the horizontal direction and the number of pixels in the vertical direction of the screen are specified. Supplies a time-series information signal corresponding to a typical image,
An image display device in which a light flux intensity-modulated by two-dimensional image information is formed into an image by an optical system to display an image is, for example, an active matrix based on two-dimensional image information in a specific display mode. It has been put into practical use as a projection-type image display device in which a light beam whose intensity has been modulated by a liquid crystal display element is projected onto a screen by a projection optical system so that a two-dimensional image can be displayed.

The active matrix liquid crystal display device in which a large number of pixels are two-dimensionally arranged is, for example,
A component (for example, a thin film transistor) for individually controlling the amount of transmitted light for each pixel, a liquid crystal sealed between a pair of substrates, a common electrode disposed on one substrate, and a Pixel electrodes arranged in a matrix, a memory element connected to the pixel electrode, a signal line provided for supplying a signal to the memory element, and an address line for selecting the memory element And accumulates electric charges in the storage element corresponding to the voltage of the input signal, and in the liquid crystal sealed between the pair of substrates, the voltage of the image signal to be displayed and It is configured such that light modulation by liquid crystal is performed by applying a corresponding electric field.

That is, the above-mentioned active matrix liquid crystal display element is driven by a time-series image signal to be displayed and a drive signal for scanning supplied from a drive circuit, so that the light source is driven by a light source. The emitted irradiation light is emitted as light whose light intensity is modulated for each pixel. When the active matrix liquid crystal display element described above is configured to operate in the scattering operation mode, it does not require a polarizer and an analyzer, but is configured to operate in another operation mode. In this case, it is well known that a polarizer is provided on the incident side of the irradiation light and an analyzer is provided on the exit side from the transmission type active matrix liquid crystal display element.

The aspect ratio of a display image (the ratio between the horizontal dimension and the vertical dimension of the screen) is different from that of a movie screen, a Japanese color TV standard system, and many other conventional TV systems. 4: 3 high definition TV
The screen of the (HDTV) system is defined as 16: 9 (the number of pixels in the horizontal direction is 1920 and the number of pixels in the vertical direction is 1080). The aspect ratio of the screen in the SXGA display mode on the screen of the computer display is as follows:
5: 4 (the number of pixels in the horizontal direction is 1280, and the number of pixels in the vertical direction is 1024). Further, the screen in the XGA display mode on the screen of the computer display is constituted by a two-dimensional array of 1024 pixels in the horizontal direction and 768 pixels in the vertical direction.

Incidentally, in an image display device using an active matrix liquid crystal display element in which a large number of pixels are two-dimensionally arranged as a light valve, as described above, the aspect ratio of the screen and the horizontal In a case where many types of screens having different numbers of pixels in the vertical direction and the number of pixels in the vertical direction are to be individually displayed for each image of one type of screen by one image display device, An active matrix liquid crystal display having a horizontal pixel array having a maximum number of horizontal pixels and a vertical pixel array having a maximum number of vertical pixels on a screen to be displayed. If the element is used as a light valve, images of the different types of screens described above can be individually displayed.

[0007]

In FIG. 3A, a rectangular frame (1) is a first frame having a 1920 × 1080 pixel array corresponding to an HDTV screen.
And the rectangular frame (2) is SX
1280 horizontal × 102 vertical in GA display mode screen
A second image display area having a four-pixel array, and a rectangular frame (3) is a third image display area having a 1280-by-720 pixel array on the screen in the HDTV display mode; (4) is a fourth pixel having 1024 horizontal pixels × 768 vertical pixels in the XGA display mode screen.
Image display area, and a rectangular frame (5) has a width of 720 pixels corresponding to a Japanese color TV standard screen.
It is a fifth image display area having a vertical 480 pixel array.

In the case where one image display device is used to selectively and individually display images of each of the various types of screens described above, the images are to be displayed. As a light valve having a horizontal pixel array having the maximum number of pixels in the horizontal direction and a vertical pixel array having the maximum number of pixels in the vertical direction on a screen, the largest among various types of screens If an active matrix liquid crystal display element in which pixels are arranged in an image area, for example, an area shown in a first image display area (1) shown in FIG. The second to fifth image areas (2) to (5) included in the first image display area (1) also correspond to the second to fifth image areas (2) to (5). ,
The images of the corresponding types of screens can be individually displayed. However, when the above-described image display mode is adopted, the entire surface of the first image area (1) in the light valve is completely covered. The area of the difference between the area of the rectangular frame (1) and the area of the rectangular frames (2) to (5) in the irradiation light from the light source provided to the light valve from the light source so that irradiation can be performed. The irradiation light irradiating the portion is not used and is discarded when the image is displayed in the rectangular frames (2) to (5).

The performance required for an image display device is that it can display a high-definition and high-luminance display image. At present, particularly, a high-luminance display image can be displayed. The most important thing is what you can do. However, as described above, the display mode of an image in which a large portion of the irradiation light emitted from the light source is discarded without being used for displaying an image is contrary to the purpose of displaying a high-luminance display image. I have. Therefore, conventionally, when it is attempted to selectively and individually display images for each one type of screen of various types of screens by one image display device, for example,
Using the active matrix liquid crystal display element in which pixels are arranged in the area shown by the first image display area (1) shown in FIGS. 3A and 3B,
The second to fifth image areas (2) to (5) shown in FIG. 3A included in the image display area (1) of FIG.
However, as shown in FIG. 3B, electric circuits are provided for the image signals so that the image can be displayed in an enlarged state as shown in image areas (2a) to (5a). Has been used to convert the number of pixels. The number of pixels in the image area (1a) is the same as the number of pixels in the image area (1), and the number of pixels in the image area (2a) is the same as the number of pixels in the image area (2). The number of pixels in the area (3a) is 1.times. The number of pixels in the image area (3).
5 times, and the number of pixels in the image area (4a) is 1.25 times the number of pixels in the image area (4).
Is twice the number of pixels in the image area (5).

However, in the conversion of the number of pixels performed by using the above-described electric circuit, the conversion of the number of pixels between the numbers of pixels that are not an integral multiple has to be performed. , Etc., complicated signal processing is required. Moreover, the number of pixels of the image to be displayed in the image areas (2) to (5) shown in FIG. Image areas (2a) to (3a) shown in FIG.
As shown in (5a), when the conversion is performed so that the number of pixels of the image to be displayed in the image area in the enlarged state is substantially the same as the number of pixels of the image, the first image area (1) of the light valve is In order to irradiate the entire surface, of the irradiation light from the light source provided to the light valve from the light source, the area of the rectangular frame (1) and the rectangular frames (3a) to (5a).
Irradiation light irradiating a portion having an area different from the area of a) is not used and is discarded when images are displayed in the rectangular frames (3a) to (5a). become. The present invention provides an image display device configured to be able to use irradiation light emitted from a light source unit without waste,
The conventional problems described above can be solved.

[0011]

According to the present invention, there is provided an image by a screen in a first display mode in which the number of pixels in the horizontal direction and the number of pixels in the vertical direction of the screen are specified to specific numbers, respectively.
The same number of pixels as the number of pixels in the vertical direction specified for the screen in the first display mode is defined as the number of pixels in the vertical direction of the screen, and the number of pixels in the first display mode is set to Is defined as the number of pixels in the horizontal direction of the screen, and has an aspect ratio different from the aspect ratio of the screen in the first display mode described above. When the image on the screen in the second display mode is individually switched and displayed, the number of pixels in the horizontal direction of the screen in the first display mode and the number of pixels in the horizontal direction on the screen in the second display mode are determined. , The horizontal pixel array having the larger number of pixels, the number of vertical pixels of the screen in the first display mode, and the number of vertical pixels of the screen in the second display mode One with more pixels than An active matrix liquid crystal display element comprising a display area having a vertical pixel array having the number of pixels and one aspect ratio in the screens of the first and second display modes, and a display object By means of the image signal corresponding to the screen image of the display mode selected to be set, the means for driving the active matrix liquid crystal display element described above, and the aspect ratio of the screen image of the display mode targeted for display, In the case of an image of a screen in a display mode different from the aspect ratio of the active matrix liquid crystal display element, the light is emitted from the active matrix liquid crystal display element in a light path of an emitted light beam in a state of being intensity-modulated by image information, and is displayed on a display object. To change the aspect ratio to the screen with the aspect ratio specified in the specified display mode screen. To provide an image display device comprising a means for providing the Morufikku optics.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific contents of an image display device according to the present invention will be described in detail with reference to the accompanying drawings. FIG.
FIG. 1 is a block diagram showing a schematic configuration of an image display device according to the present invention. In this figure, reference numeral 1 denotes a light emitting source. As the light emitting source 1, for example, a metal halide lamp may be used. 2 is a reflecting mirror, 3 is a condenser lens,
Reference numeral 4 denotes an integrator for removing the light unevenness of the light emitting source 1. As the integrator 4, for example, a fly-eye lens array plate can be used. 5 is an active matrix liquid crystal display element used as a light valve, 6 is an anamorphic optical system, 7 is a projection optical system used when the image display device is configured as a projection type image display device, 8 is a screen, Reference numeral 9 denotes a driving unit of the active matrix liquid crystal display element, and reference numeral 10 denotes an input terminal of an image signal to be displayed.

The irradiation light beam emitted from the light source 1 is reflected by the reflecting mirror 2 and then enters the condenser lens 3.
The irradiation light emitted from the condenser lens 3 is emitted from the integrator 4 in a state where the light unevenness of the light emitting source 1 has been removed by the integrator 4, and is emitted from the integrator 4. The irradiation light beam emitted from the integrator 4 irradiates the entire display area of the active matrix liquid crystal display element 6.

The active matrix liquid crystal display element 5 includes a screen in the first display mode in which the number of pixels in the horizontal direction and the number of pixels in the vertical direction of the screen are specified to specific numbers, respectively. The same number of pixels as the number of pixels in the vertical direction specified for the screen in the first display mode is specified as the number of pixels in the vertical direction of the screen, and the number of pixels in the first display mode is specified. The same number of pixels as the number of pixels in the horizontal direction is defined as the number of pixels in the horizontal direction of the screen, and the second pixel having an aspect ratio different from the aspect ratio of the screen in the first display mode described above. Of the display mode of the first,
By comparing the number of pixels in the horizontal direction of the screen in the display mode of the second display mode with the number of pixels in the horizontal direction of the screen in the second display mode, the pixel array in the horizontal direction having the larger number of pixels, A vertical pixel array having a larger number of pixels as compared with the number of pixels in the vertical direction of the screen in the first display mode and the number of pixels in the vertical direction of the screen in the second display mode; 1st, 2nd
In this case, a configuration having a display area having one aspect ratio on the screen in the display mode is used.

FIG. 2A shows the first and second images selectively displayed for displaying an image in the image display apparatus of the present invention.
In the screen of the second display mode, the display screen is (vertical 1024).
SXG composed of a pixel array of (pixel x 1280 horizontal pixels)
The screen in the A display mode is the screen in the first display mode, and the screen in the HDTV display mode in which the display screen has a pixel array of (1080 pixels vertically × 1280 pixels horizontally) is the second screen.
FIG. 9 is a diagram showing a configuration example of a display area of an active matrix liquid crystal display element 5 used when the screen is in the display mode of FIG. The display area of the active matrix liquid crystal display element 5 illustrated by a solid line frame in FIG. 2A [shown by a two-dot chain line frame in FIGS. 2B and 2C]
Is configured to have a display area with an aspect ratio of approximately 5: 4 by a pixel array of (1080 pixels vertically × 1280 pixels horizontally).

The entire display area of the active matrix liquid crystal display element 5 is illuminated by irradiation light from the integrator 4 of the light source unit in a state where the light intensity distribution is not uneven. The drive unit 9 of the element 5 receives an image signal targeted for display from the input terminal 10, that is, an image signal of a screen in the first or second display mode targeted for display on the image display device. An image signal to be displayed in the selected specific display mode is supplied.

The image to be displayed on the image display apparatus is, for example, a screen in the SXGA display mode (first screen).
In this case, the image signal of the screen of the SXGA display mode is supplied from the input terminal 10 to the driving unit 9 of the active matrix liquid crystal display element 5, whereby the active matrix liquid crystal display element 5 is driven. (1024 vertical pixels × 1 horizontal pixel) in the display area of the liquid crystal display element 5 having a pixel array of (1080 vertical pixels × 1280 horizontal pixels)
In the portion of the pixel array of (280 pixels) [indicated by the dotted frame in FIG. 2A], the aspect ratio by the pixel array of (1024 vertical pixels × 1280 horizontal pixels) by the image signal of the screen in the SXGA display mode Is displayed on the screen of 5: 4.

If the image to be displayed on the image display device is, for example, an image of an HDTV display mode screen (a screen of a second display mode), the driving section of the active matrix liquid crystal display element 5 9, an image signal of a screen in the HDTV display mode is supplied from an input terminal 10, whereby the entire display area having a pixel array of (vertical 1080 pixels × horizontal 1280 pixels) in the active matrix liquid crystal display element 5 [FIG. 2 (a) is indicated by a solid line frame], a display image having an aspect ratio of approximately 5: 4 is obtained by a pixel array of (1080 vertical pixels × 1280 horizontal pixels) by the image signal of the screen in the HDTV display mode. Is displayed.

By the way, the screen of the SXGA display mode is defined to constitute a screen having an aspect ratio of 5: 4 by a pixel array of (1024 vertical pixels × 1280 horizontal pixels). (1080 vertical pixels × 128 horizontal pixels) in the matrix liquid crystal display element 5
(Vertical 1024) in a display area having a pixel array of (0 pixels)
A pixel array (pixels × width 1280 pixels) [indicated by a dotted line frame in FIG. 2 (a)] has an image signal of a screen in the SXGA display mode (height 1024 pixels × width 128).
Even if a display image of a screen having an aspect ratio of 5: 4 due to the pixel arrangement of (0 pixels) is displayed, (1080-1024) among the pixels arranged in the vertical direction in the display area of the active matrix liquid crystal display element 5. ) = 56 pixels are not used, but the display area of the active matrix liquid crystal display element 5 has SX.
The image on the screen in the GA display mode can be displayed without distortion.

On the other hand, the display image based on the image signal of the screen in the HDTV display mode is (1080 pixels vertically × 1 pixel horizontally).
The aspect ratio is 16:
9, the image without distortion can be displayed on the screen. However, as described above, the display area of the active matrix liquid crystal display element 5 is (1080 pixels × vertical pixels).
When the aspect ratio is approximately 5: 4 due to the pixel arrangement of 1280 pixels (horizontal), the display image of the screen of the HDTV display mode displayed in the display area of the active matrix liquid crystal display element 5 has a horizontal image size. The distorted image is reduced in the direction.

Therefore, in the image display apparatus of the present invention, the active matrix liquid crystal display device is driven by the active matrix liquid crystal display element by using a time-series image signal to be displayed and a scanning drive signal. When the liquid crystal display element 5 is driven, the light image of the state in which the light intensity is modulated for each pixel by the irradiation light from the active matrix liquid crystal display element 5 is displayed by the image signal of the screen in the HDTV display mode. Only in the case of an image, an anamorphic for changing the aspect ratio from 5: 4 to 16: 9 in the optical path of the emitted light beam emitted in a state where the intensity is modulated by the image information from the active matrix liquid crystal display element 5. The optical system 6 is inserted and arranged.

FIG. 1 shows an example in which the anamorphic optical system 6 is inserted and arranged in the optical path between the active matrix liquid crystal display element 5 and the projection optical system 7. The anamorphic optical system 6 may be inserted and arranged in the optical path between the projection optical system 7 and the screen 10. The arrow Y in FIG. 1 indicates that the anamorphic optical system 6 is inserted and disposed in the optical path between the active matrix liquid crystal display element 5 and the projection lens system 7 as necessary, This indicates that the light is removed from the optical path between the liquid crystal display element 5 and the projection lens system 7.

The above-described anamorphic optical system 6 can be easily configured to have predetermined characteristics using, for example, one or more cylindrical lenses.
May be used as an aspherical lens. In addition, depending on which of the plurality of types of display modes the image to be displayed as described above is in the optical path of the light emitted from the active matrix liquid crystal display element 5, The operation of inserting the anamorphic optical system 6 having characteristics and removing the anamorphic optical system 6 from the optical path of the light emitted from the active matrix liquid crystal display element 5 or the operation of image display The image targeted for display in the device may be automatically performed according to which display mode among the plurality of types of display modes, or the image targeted for display in the image display device, It may be performed manually depending on which display mode among a plurality of types of display modes.

When the image to be displayed on the image display device is a screen image in the SXGA display mode, the anamorphic optical system 6 is inserted and arranged in the optical path of the light emitted from the active matrix liquid crystal display element 5. By not doing
An optical image having a screen shape with an aspect ratio of 5: 4, which is intensity-modulated by image information emitted from the active matrix liquid crystal display element 5, is projected onto a screen 7 by a projection optical system 7 and has a distortion of 5: 4. An image is formed as a non-existent image [see (b) of FIG. 2].

When the image to be displayed on the image display device is an image on the screen in the HDTV display mode, the display area of the active matrix liquid crystal display element 5 having an aspect ratio of approximately 5: 4 is selected. The anamorphic optical system 6 for changing the aspect ratio from 5: 4 to 16: 9 is inserted and arranged in the optical path of the emitted light of The intensity-modulated light image having a screen shape with an aspect ratio of approximately 5: 4 has an aspect ratio of 16: 4 by the anamorphic optical system 6 described above.
9 is changed to a light image. Thus, the image projected onto the screen 7 by the projection optical system 7 is an image having an aspect ratio of 16: 9 and having no distortion, as shown in FIG.

In the above description, in the image display apparatus of the present invention, the display screen is (1024 pixels vertically × horizontally) in the screens of the first and second display modes selectively displayed for displaying an image. An SXGA display mode screen having an aspect ratio of 5: 4 based on a pixel array of 1280 pixels (1280 pixels) is used as a first display mode screen.
The screen in the HDTV display mode in which the aspect ratio of the pixel array of 80 pixels × 1280 pixels horizontally is 16: 9 is the second screen.
The explanation has been made as the screen of the display mode. On the other hand, it is described that the display screen in the HDTV display mode performed with reference to FIG. 3 has an aspect ratio of 16: 9 based on a pixel array of (1080 pixels vertically × 1920 pixels horizontally).
As described above, regarding the HDTV display mode, two types of display modes having different numbers of pixels constituting a screen are both used.
The reason why the HDTV display mode is described is that two types of HDTV display modes having different numbers of pixels constituting a screen are both called HDTV display modes.

The above display screen has an aspect ratio of 16: 1080 pixels × 1920 pixels in pixel array.
For example, the HDTV display mode screen of No. 9 is adopted as a regular standard of HYBON in Japan, but most of the screens provided as a high-definition TV receiver are muse standard display screens in view of cost. At present, a screen of an HDTV display mode having an aspect ratio of 16: 9 based on a pixel array of (1080 pixels vertically × 1280 pixels horizontally) is employed. As a display screen of a display in a high definition TV receiver, An aspect ratio of a pixel array of (vertical 1080 pixels × horizontal 1280 pixels) is 16:
There is a worldwide trend to adopt 9 HDTV display mode screens. So, as in the previously described embodiment,
As the screens of the first and second display modes, the screen of the SXGA display mode is used as the screen of the first display mode, and the display screen has an aspect ratio of 16 (1080 pixels × 1280 pixels) having an aspect ratio of 16: If the screen of the HDTV display mode 9 is the screen of the second display mode, there is an advantage that more information can be displayed on one image display device.

The description of the embodiment of the image display apparatus of the present invention has been made so far. The first display mode screen among the first and second display mode screens used for displaying an image is described. The screen in the SXGA display mode having an aspect ratio of 5: 4 based on a pixel array of (1024 vertical pixels × 1280 horizontal pixels), and the screen in the second display mode is (108 vertical pixels)
Assuming that the screen is in the HDTV display mode having an aspect ratio of 16: 9 based on a pixel array of 0 pixels × 1280 pixels in width, the active matrix liquid crystal display element 5 (vertical) is used for both display modes. 1080
This is a case in which pixels having a configuration of (pixels × 1280 pixels in width) arranged on a surface having an aspect ratio of about 5: 4 are used. The screens of the first and second display modes used for display are the same as those of the above-described embodiments in the first display mode (vertical 1024).
This is an SXGA display mode screen having an aspect ratio of 5: 4 based on a pixel array of (pixel × width 1280 pixels).
The screen in the second display mode is (1080 pixels vertically × 128 pixels horizontally)
When the screen is in the HDTV display mode having an aspect ratio of 16: 9 based on a pixel array of (0 pixels), the active matrix liquid crystal display element 5 used for display in both display modes described above (1080 pixels vertically × horizontal) 1280
The present invention may be implemented using a configuration in which pixels (pixels) are arranged on a display area having an aspect ratio of 16: 9.

In the image display apparatus of the present invention, as described above, the screen in the SXGA display mode having the pixel array of (1024 vertical pixels × 1280 horizontal pixels), and
HDT composed of a pixel array of (pixels x 1280 pixels)
As an active matrix liquid crystal display element 5 used for displaying a screen in two display modes including a screen in a V display mode, a display area with an aspect ratio of 16: 9 by a pixel array of (1080 pixels vertically × 1280 pixels horizontally) is used. Even when such a configuration is used, the entire display area of the active matrix liquid crystal display element 5 is irradiated from the integrator 4 of the light source unit in a state where the light intensity distribution is uniform. Irradiated by light. Also,
The driving section 9 of the active matrix liquid crystal display element 5 includes:
An image signal to be displayed from the input terminal 10, that is, the first and the first signals to be displayed on the image display device.
An image signal to be displayed in a specific display mode selected from the image signal of the screen in the second display mode is supplied.

An image to be displayed on the image display device is, for example, a screen in the SXGA display mode (first screen).
In this case, the image signal of the screen of the SXGA display mode is supplied from the input terminal 10 to the driving unit 9 of the active matrix liquid crystal display element 5, whereby the active matrix liquid crystal display element 5 is driven. (1024 vertical pixels × 1 horizontal pixel) in the display area of the liquid crystal display element 5 having a pixel array of (1080 vertical pixels × 1280 horizontal pixels)
The image signal of the screen in the SXGA display mode (1024 vertical pixels × 1280 horizontal pixels)
A display image of a screen having an aspect ratio of approximately 16: 9 based on the pixel arrangement of (pixels) is displayed.

If the image to be displayed on the image display device is, for example, an image of a screen in the HDTV display mode (a screen in the second display mode), the driving section of the active matrix liquid crystal display element 5 9, an image signal of a screen in the HDTV display mode is supplied from the input terminal 10, whereby an entire display area having a pixel array of (vertical 1080 pixels × horizontal 1280 pixels) in the active matrix liquid crystal display element 5 is provided. A display image having an aspect ratio of 16: 9 is displayed by a pixel array of (1080 vertical pixels × 1280 horizontal pixels) by an image signal of a screen in the HDTV display mode.

By the way, since the screen of the SXGA display mode is defined to form a screen having an aspect ratio of 5: 4 by a pixel array of (1024 vertical pixels × 1280 horizontal pixels), the active mode is set as described above. (1080 vertical pixels × 128 horizontal pixels) in the matrix liquid crystal display element 5
(Vertical 1024) in a display area having a pixel array of (0 pixels)
SXGA in the pixel array
According to the image signal of the screen in the display mode (vertical 1024 pixels ×
When the screen is displayed as a screen having an aspect ratio of approximately 16: 9 due to the pixel arrangement of 1280 pixels (horizontal), the display image of the screen of the SXGA display mode displayed in the display area of the active matrix liquid crystal display element 5 is as follows. , Resulting in a distorted image with the image dimensions enlarged in the horizontal direction.
It should be noted that among the pixels arranged in the vertical direction in the display area of the active matrix liquid crystal display element 5, (108
0-1024) = 56 pixels are not used. on the other hand,
The display image based on the image signal of the screen in the HDTV display mode described above is displayed in a display area having an aspect ratio of 16: 9 by the pixel array of (1080 pixels vertically × 1280 pixels horizontally) in the active matrix liquid crystal display element 5 as described above. An image without distortion can be displayed on the screen.

Therefore, the image display apparatus of the present invention has a SXGA display mode screen composed of a pixel array of (1024 vertical pixels × 1280 horizontal pixels) as described above, and
HD consisting of a pixel array of 0 pixels x 1280 pixels horizontally
As an active matrix liquid crystal display element 5 used for displaying a screen in the TV display mode and a screen in the two display modes, a display area having an aspect ratio of 16: 9 by a pixel array of (1080 pixels vertically × 1280 pixels horizontally) is used. In the case where the present invention is implemented in a configuration using such a configuration, a time-series image signal to be displayed, which is supplied from the driving unit 9 of the active matrix liquid crystal display element, When the active matrix liquid crystal display element 5 is driven by the drive signal of the SXGA display mode, the light image of the light from the active matrix liquid crystal display element 5 whose light intensity is modulated for each pixel is changed to the SXGA display mode. In the case of the display image by the image signal of the screen of
An anamorphic optical system 6 for changing the aspect ratio from approximately 16: 9 to 5: 4 is provided in the optical path of the emitted light beam emitted in a state where the intensity is modulated by the image information from the active matrix liquid crystal display element 5. By inserting, S
An image on a screen having an aspect ratio of 5: 4 specified on the screen in the XGA display mode is formed on the screen 8 by the projection lens 7.

Further, the active matrix liquid crystal display element 5 is driven by a time-series image signal to be displayed and supplied from the driving section 9 of the active matrix liquid crystal display element and a driving signal for scanning. Accordingly, in the case where the light image of the light in which the irradiation light from the active matrix liquid crystal display element 5 has the light intensity modulated for each pixel is a display image based on the image signal of the screen in the HDTV display mode, The anamorphic optical system 6 is not inserted into the optical path of the emitted light beam emitted from the active matrix liquid crystal display element 5 in a state where the intensity is modulated by image information. As a result, an image on a screen having an aspect ratio of 16: 9 defined on the screen in the HDTV display mode is formed on the screen 8.

As is apparent from the above description, in the image display device of the present invention, the screen display of each of the individual display modes in the plurality of types of display modes which the image display device can support is radiated from the respective light sources. This is performed in a state where the amount of irradiation light is not wasted. Although the description so far has been made on the case where the image display device is configured using one active matrix liquid crystal display element, the present invention is configured using a plurality of active matrix liquid crystal display elements. It goes without saying that the present invention can be applied to an image display device. When the present invention is implemented for an image display device configured using a plurality of active matrix liquid crystal display elements, the irradiation light emitted from the light source unit is split by a beam splitter, and each active matrix liquid crystal display element May be made to enter. If the beam splitter is configured as a three-color separation optical system, a three-plate type color image display device can be obtained. Further, when the irradiation light divided into two by the beam splitter is made to enter two active matrix liquid crystal display elements, a two-plate type color image display device or a three-dimensional image display device can be configured. .

[0036]

As apparent from the above description, in the image display apparatus of the present invention, the number of pixels in the horizontal direction and the number of pixels in the vertical direction of the screen are specified to specific numbers, respectively. An image based on the screen in the first display mode, and the same number of pixels as the number of pixels in the vertical direction defined for the screen in the first display mode are defined as the number of pixels in the vertical direction of the screen, In addition, the same number of pixels as the number of pixels in the horizontal direction defined for the screen in the first display mode is defined as the number of pixels in the horizontal direction of the screen, and In the case where an image on the screen in the second display mode having an aspect ratio different from the aspect ratio of the screen is individually switched and displayed, the number of pixels in the horizontal direction on the screen in the first display mode and the second Display mode Compared with the number of pixels in the horizontal direction of the screen, the horizontal pixel array having the larger number of pixels, the number of pixels in the vertical direction of the screen in the first display mode, and the second display mode A vertical pixel array having a larger number of pixels compared to the number of pixels in the vertical direction of the screen,
Using an active matrix liquid crystal display element having a display area having one aspect ratio on the screen in the first and second display modes,
The active matrix liquid crystal display element is driven by an image signal corresponding to an image of the screen in the display mode selected to be displayed among the images of the screen in the second display mode, and When the aspect ratio of the screen of the image to be displayed is an image of a screen in a display mode different from the aspect ratio of the active matrix liquid crystal display element, the state in which the intensity is modulated by the image information from the active matrix liquid crystal display element. An anamorphic optical system is inserted and arranged in the optical path of the emitted light beam emitted in the display mode screen so that a screen having an aspect ratio defined by the display mode screen can be formed. Since it is possible to display a screen image having a specified aspect ratio, for example, a computer A common active matrix liquid crystal display element is used for displaying a screen image in a standard SXGA display mode as a display mode of a display screen and displaying a screen image in a standard HDTV display mode as a display mode of a high definition television screen. By using the method described above, it is possible to perform the operation in a state where the amount of irradiation light emitted from the light source is not wasted, and according to the present invention, it is possible to improve the above-described conventional problems. Can be resolved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an image display device of the present invention.

FIG. 2 is a diagram for explaining a display screen by the image display device of the present invention.

FIG. 3 is a diagram showing an image area.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Light emission source, 2 ... Reflection mirror, 3 ... Condenser lens, 4 ...
Integrator, 5: Active matrix liquid crystal display element used as light valve, 6: Anamorphic optical system, 7: Projection optical system used when image display device is configured as projection type image display device, 8 ... Screen, 9: drive unit of the active matrix liquid crystal display element, 10: input terminal of an image signal to be displayed,

Claims (1)

[Claims] 1. An image of a screen in a first display mode in which the number of pixels in the horizontal direction and the number of pixels in the vertical direction of the screen are specified to be specific numbers, respectively, and a screen of the first display mode described above. Are defined as the number of pixels in the vertical direction of the screen, and the number of pixels in the horizontal direction defined for the screen in the first display mode described above. The same number of pixels as the number of pixels in the horizontal direction of the screen is defined as the number of pixels in the horizontal direction of the screen, and the image by the screen in the second display mode having an aspect ratio different from the aspect ratio of the screen in the first display mode described above. A light source unit including at least a light-emitting source and an integrator and configured to emit irradiation light; and a first table described above. The number of pixels in the horizontal direction of the screen in the display mode is compared with the number of pixels in the horizontal direction of the screen in the second display mode, and the pixel array in the horizontal direction having the larger number of pixels is used. A vertical pixel array having a larger number of pixels as compared with the number of pixels in the vertical direction of the screen in the display mode and the number of pixels in the vertical direction of the screen in the second display mode;
An active matrix liquid crystal display element having a display area having one aspect ratio in the screens of the first and second display modes, and a screen of a display mode selected to be displayed Means for driving the above-described active matrix liquid crystal display element by an image signal corresponding to the above-mentioned image, and display in which the aspect ratio of the screen image of the display mode targeted for display is different from the aspect ratio of the active matrix liquid crystal display element In the case of an image of a mode screen, it is defined in the display mode screen targeted for display in the optical path of an emitted light beam emitted in a state where the intensity is modulated by the image information from the active matrix liquid crystal display element. Means for disposing an anamorphic optical system for changing the aspect ratio on an aspect ratio screen; Comprising an image display device comprising.