JPH0915548A - Display device - Google Patents

Abstract

PURPOSE: To provide a display device obtaining an observed image whose resolution is high even in the case of having the picture element of delta array such as a general liquid crystal panel. CONSTITUTION: The display device having a display element 11 constituted by arraying plural picture elements developing different colors possesses optical axis shifting means (13, 14, 15 and 16) selectively shifting the optical axis of a video on the display element 11 in proportion to the array pitch of the picture element and a video shift controlling means selectively shifting the video displayed on the display element 11 in a direction opposite to an optical axis shift direction synchronizing with the operation of the optical axis shifting means 13-16.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a conventional display device, for example, the one shown in FIG. 23 is disclosed in Japanese Patent Laid-Open No. 4-113308. This display device includes a display liquid crystal panel 1
The liquid crystal panel 2 for controlling the polarization direction and the crystal plate 3 are arranged in front of the display surface side of the display panel so as to display the original image in which the number of pixels in the horizontal direction is twice the number of pixels of the display liquid crystal panel 1. It is a thing. For this reason, in this display device, the image signals of one screen are thinned out every other pixel in the horizontal direction by the distributor 4 to be decomposed into images of two fields, and the frame memories 5 and 6 are displayed.
The image of each field stored in the frame memories 5 and 6 is read out for each field by the synchronization signal generator 7 and supplied to the display liquid crystal panel 1 for display, and in synchronization with the reading. Drive voltage generator 8
Thus, a required voltage is selectively applied to the polarization direction controlling liquid crystal panel 2.

That is, when displaying an image of a field stored in the frame memory 5, a voltage is applied to the liquid crystal panel 2 for controlling the polarization direction so that the image displayed on the liquid crystal panel 1 for display is polarized. When the display liquid crystal panel 1 is viewed from the side of the crystal plate 3 by allowing the crystal plate 3 to transmit without rotating the direction and further transmitting the crystal plate 3 as an ordinary ray, FIG.
As shown in A, the image is displayed at the normal pixel position (first position) of the display liquid crystal panel 1. When displaying the image of the field stored in the frame memory 6, the applied voltage to the polarization direction control liquid crystal panel 2 is turned off, and the image displayed on the display liquid crystal panel 1 is changed in its polarization direction. When the display liquid crystal panel 1 is viewed from the crystal plate 3 side by rotating the crystal plate 3 as an extraordinary ray by rotating 90 degrees, each pixel of the display liquid crystal panel 1 is changed as shown in FIG. 24B. The image is displayed at a position (second position) that is shifted by 1/2 pixel pitch from the normal pixel position in the horizontal direction.

As described above, in the conventional display device shown in FIG. 23, one screen is divided into two fields, and the operation of displaying the first field at the first position and the second field at the second position is performed at high speed. 24C, the pixel pitch in the horizontal direction of the display liquid crystal panel 1 is interpolated to improve the resolution.

[0005]

However, in a liquid crystal panel, as a pixel array suitable for displaying an image, generally, a delta array in which pixels are arranged so as to be shifted for each line so as to interpolate pixels in the horizontal direction. There is a problem in that the resolution cannot be improved even if the method of interpolating the pixel pitch as described above is adopted for such a delta array, because a pixel array called as is often used.

Further, in the above-mentioned conventional display device, since the crystal plate 3 is used to shift the observation pixel position selectively by 1/2 pixel pitch, the processing is difficult and the cost is increased, and the device is also increased. There is a problem that the whole becomes large.

Further, in displaying an image on a liquid crystal panel, generally, pixels arranged in a matrix are raster-scanned, and the liquid crystal panel has a memory effect of leaving an image. . Therefore, as described above, when the pixel is shifted and displayed for each field, for example, when the pixel is shifted and displayed from the first position to the second position, the second field in the second position is not displayed. Due to the memory effect of the liquid crystal, the image of the first field at the first position is displayed in the scanning region, which causes a problem that the resolution is lowered and the initial purpose cannot be achieved.

Further, as in the above-mentioned conventional example, 1
When the image signal on the screen is decomposed into an image of two fields and the pixel pitch is interpolated, two expensive frame memories are required, which causes a problem that the cost of the entire apparatus increases.

Incidentally, such a problem is not limited to the case of displaying an image using a liquid crystal panel, but is also applicable to the case of using a display element such as a plasma display, an EL or a photochromic having pixels arranged in a matrix. The same happens.

The present invention has been made by paying attention to the above-mentioned conventional problems. A first object of the present invention is to provide high-resolution observation even when pixels having a delta arrangement are used as in a general liquid crystal panel. An object is to provide a display device appropriately configured to obtain an image.

A second object of the present invention is to provide a display device which is appropriately configured so as to be simple and inexpensive and to be small in size.

A third object of the present invention is to provide a display device appropriately configured to obtain a high-resolution observation image even when there is a memory effect in which an image remains as in a liquid crystal panel.

A fourth object of the present invention is to provide a display device appropriately constructed so that the whole device can be made inexpensive.

[0014]

In order to achieve the above first object, the first invention is a display device having a display element in which a plurality of pixels emitting different colors are arranged. An optical axis shift unit that selectively shifts the optical axis of the image in proportion to the array pitch of the pixels, and the optical axis shift unit in a direction opposite to the optical axis shift direction in synchronization with the operation of the optical axis shift unit. And an image shift control means for selectively shifting an image displayed on the display element.

In order to achieve the second object, the second invention is a display element for displaying an image, a polarization conversion means for selectively converting the polarization of light emitted from the display element, and the polarization conversion means. A birefringent plate made of TiO ₂ that selectively shifts the optical axis of the image on the display element in accordance with the polarization by the display element and an image to be displayed on the display element in synchronization with the operation of the polarization conversion means. And a video shift control means for selectively shifting.

In order to achieve the third object, the third invention is a display having a plurality of pixels arranged in a matrix and having a display element for displaying an image by scanning these pixels with a video signal. In the apparatus, an optical axis shift means for selectively shifting an optical axis of an image on the display element, and an image displayed on the display element in synchronization with an ON / OFF operation of the optical axis shift by the optical axis shift means. And image shift control means for selectively shifting the optical axis, and when the optical axis shift is switched by the optical axis shift means, the image is not displayed on the display element.

Furthermore, a fourth invention is a display device having a plurality of pixels arranged in a matrix and displaying the image by scanning these pixels with a video signal, wherein the liquid crystal display element is provided. Optical axis shift means for selectively shifting the optical axis of the image above, and image shift control means for selectively shifting the image displayed on the liquid crystal display element in synchronization with the operation of the optical axis shift means, And a scanning illumination means for scanning and illuminating the liquid crystal display element in synchronization with a scanning signal to the liquid crystal display element.

Further, a fifth invention is a display device having a plurality of pixels arranged in a matrix and displaying the image by scanning these pixels with a video signal, on the display element. Optical axis shift means for selectively shifting the optical axis of the image, and image shift for selectively shifting the image to be displayed on the display element in synchronization with the on / off operation of the optical axis shift by the optical axis shift means. And a control means for changing the timing of switching on / off of the optical axis shift by the optical axis shift means with respect to the scanning timing of the image on the display element.

Further, a sixth invention is such that a display element for displaying an image and an optical axis of the image on the display element are set to the first axis,
An optical axis shift unit that selectively shifts to the second axis and the third axis, and an image displayed on the display element in synchronization with the operation of the optical axis shift unit, a first shift amount, Image shift control means for selectively shifting from the second shift amount and the third shift amount, and selecting patterns of the first axis, the second axis and the third axis by the optical axis shift means. It is characterized in that it is configured to be changed sequentially.

Further, a seventh invention is a display device having a plurality of pixels arranged in a matrix and displaying the image by scanning these pixels with a video signal, on the display element. An optical axis shift means for selectively shifting an optical axis of an image, and an image shift control means for selectively shifting an image displayed on the display element in synchronization with the operation of the optical axis shift means, It is configured such that a sequential row of the display elements is horizontally scanned by the video signal to display a video, and the optical axis shift means shifts the optical axis of the video during the display scanning. It is what

In order to achieve the above-mentioned fourth object, an eighth invention is a display device in which a video signal from an image pickup device is displayed on the display device, and an optical axis of incident light to the image pickup device is selected. Image pickup optical axis shift means for selectively shifting, and display optical axis shift means for selectively shifting the optical axis of the image on the display element.

[0022]

In the first aspect of the invention, the optical axis of the image displayed on the display element is selectively shifted by the optical axis shift means in proportion to the arrangement pitch of the pixels, and the optical axis shifts in synchronization with the shift operation. The image displayed on the display device is selectively shifted by the image shift control means in the direction opposite to the optical axis shift direction. Therefore, in the observed image,
Since the images before and after the shift are overlapped by the optical axis shift, even if the pixels are arranged in a delta arrangement, one pixel can apparently reproduce a plurality of colors, and the resolution can be improved.

In the second invention, the polarization of the light emitted from the display element is selectively converted by the polarization converting means, and the optical axis of the image on the display element is converted by the birefringent plate made of TiO ₂ according to the polarization. Are selectively shifted. Also,
The image displayed on the display element is selectively shifted by the image control means in synchronization with the operation of the polarization conversion means. In this way, using a birefringent plate made of TiO ₂ ,
By shifting the optical axis of the image on the display element, that is, by shifting the pixels to achieve high resolution, the birefringent plate can be easily processed, and therefore, when another type of birefringent plate is used. In comparison, it can be made simple and inexpensive, and the size of the entire device can be reduced.

In the third invention, the optical axis of the image displayed on the display element is selectively shifted by the optical axis shift means, and in synchronization with the shift operation, the image shift control means causes the image on the display element. The image displayed on the screen is selectively shifted, but the image is not displayed on the display element when the optical axis shift is switched. Therefore, since different images that are shifted from each other are not observed at the same time, even when a display element having a memory effect is used,
By shifting the pixels, the resolution can be effectively improved.

In the fourth invention, the optical axis of the image displayed on the liquid crystal display element is selectively shifted by the optical axis shift means, and the liquid crystal display is controlled by the image shift control means in synchronization with the shift operation. The image displayed on the device is selectively shifted. Further, in the liquid crystal display element, only the vicinity of the pixel receiving the scanning signal is scanned and illuminated by the scanning illumination means in synchronization with the scanning signal. Therefore, different images that are shifted from each other are not observed at the same time, and it is possible to effectively improve the resolution by shifting the pixels using the liquid crystal display element.

In the fifth invention, the optical axis of the image displayed on the display element is selectively shifted by the optical axis shift means, and in synchronization with the shift operation, the image shift control means causes the image on the display element. The image displayed on the screen is selectively shifted, but the timing of switching on / off the optical axis shift by the optical axis shift means is changed with respect to the scanning timing of the image on the display element. Therefore, by changing the switching timing of the optical axis shift, the high-resolution display line changes, and even when a display element having a memory effect is used, the resolution of the entire display surface is effectively improved by shifting the pixel. It becomes possible.

In the sixth invention, the optical axis of the image displayed on the display element is the first axis by the optical axis shift means,
An image that is selectively shifted to the second axis and the third axis and that is displayed on the display element in synchronization with the shift operation is
The image shift control means selectively shifts by the first shift amount, the second shift amount, and the third shift amount.
Therefore, even when a display element having a memory effect is used, it is possible to effectively improve the resolution of the entire display surface by shifting the pixels. Further, since the selection patterns of the first axis, the second axis, and the third axis by the optical axis shift means are sequentially changed, it is effective to generate the flow of the observation image which is likely to occur when the predetermined order is repeated. Can be prevented.

In the seventh invention, the optical axis of the image displayed on the display element is selectively shifted by the optical axis shift means, and in synchronization with the shift operation, the image shift control means causes the image on the display element. The image displayed on the screen is selectively shifted, but the display element displays the image by horizontally scanning successive columns by the image signal and displays the image during the display scanning by the optical axis shift means. The axis is shifted.
Therefore, even when a display element having a memory effect is used, it is possible to effectively improve the resolution of the entire display surface by shifting the pixels, and particularly, the optical axis shift is performed when scanning the center of the screen. As a result, it is possible to effectively increase the resolution of the central region, which is easy for an observer to look at when viewing an image.

In the eighth invention, the optical axis of the light incident on the image pickup element is selectively shifted by the image pickup optical axis shift means, and the optical axis of the image on the display element is changed by the display optical axis shift means. The image signal from the image pickup device is selectively shifted and displayed on the display device. Therefore, it is possible to improve the resolution of each of the image pickup device and the display device without using an expensive frame memory.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention. In this embodiment, as a display element, for example, R,
A liquid crystal panel (hereinafter, referred to as an LCD) 11 in which G and B pixels are arranged in a matrix in a delta arrangement is used. The LCD 11 sequentially displays images having different sampling timings by the pixel pitch and displays the images. In synchronism with the above, the optical axis shift means switches the optical axis of each pixel in the direction opposite to the image shift direction due to the sampling timing so as to be shifted by the pixel pitch, thereby achieving high resolution. For this reason, in this embodiment, the backlight 12 that emits white light is arranged on the back side of the LCD 11, and the first polarization conversion liquid crystal plate 13 and the first compound liquid crystal plate 13 forming the optical axis shift means are arranged on the front side of the LCD 11. The refraction plate 14, the second polarization conversion liquid crystal plate 15, and the second birefringence plate 16 are sequentially arranged.

Here, the LCD 11 horizontally scans the image so that the image is sequentially displayed from the top to the bottom of the screen, and the LCD drive circuit (not shown) sequentially shifts the sampling timing of the image signal by the pixel pitch for display. Control. In addition, the first and second polarization conversion liquid crystal plates 13,
Reference numeral 15 denotes an LCD 11 by a liquid crystal control circuit (not shown).
The on / off control is performed in synchronization with the display of the image by, so that the incident polarized light is transmitted as it is in the on state and the incident polarized light is rotated by 90 ° in the off state.

The light transmitted through the first polarization conversion liquid crystal plate 13 is left in the first birefringent plate 14 as it is or in the direction opposite to the image shift direction due to the sampling timing shift, depending on the polarization state. The light that has been transmitted by shifting the optical axis by one pixel pitch (x) and has passed through the second polarization conversion liquid crystal plate 15 similarly goes through the second birefringent plate 16 as it is, depending on its polarization state. Alternatively, the optical axis is shifted by one pixel pitch (x) in the direction opposite to the image shift direction due to the shift of the sampling timing, and the light is transmitted.

Here, the first and second birefringent plates 14 and 16
Is quartz (α-SiO ₂ ), rutile (TiO ₂ ), calcite (CaCo ₃ ), chilli glass (NaNo ₃ ) and YVO ₄
However, it is particularly preferable to use rutile. That is, since rutile has a birefringence 30 times larger than that of quartz,
The thickness can be set to 0.5 mm when the optical axis is shifted by 50 μm. Further, since rutile has a higher Mohs hardness than other materials, it has an advantage that it can be easily processed.

The first and second birefringent plates 14 and 16 are generally called Savart plates, and their crystal axes are 45 ° with respect to the surfaces.
Since it is inclined, if the incident polarized light is ordinary light, it goes straight out and is emitted, and if it is extraordinary light, it is emitted with deviation, but the amount of deviation can be adjusted by the thickness of the Savart plate. In this embodiment, the first and second birefringent plates 14 and 1
The thicknesses of 6 are set so that the shift amounts are each equal to the pixel pitch of the LCD 11. As described above, if the Savart plate is used, the two optical axes emitted according to the incident polarized light become parallel, so that the shift amount of the two optical axes becomes constant regardless of the distance from the LCD 11, and therefore the LCD 11 with respect to the LCD 11 is shifted. There is an advantage that each birefringent plate can be arranged with a degree of freedom.

The operation of this embodiment will be described below with reference to FIG. First, for example, the first polarization conversion liquid crystal plate 13
Is turned off and the voltage to the second polarization conversion liquid crystal plate 15 is turned on to supply the video signal at the sampling timing m to each of the R, G and B pixels of the LCD 11. In this case, the image on the LCD 11 is transmitted through the first and second birefringent plates 14 and 16 as it is because the polarization direction is rotated by 90 ° by the first polarization conversion liquid crystal plate 13.

Next, the voltage to the first polarization conversion liquid crystal plate 13 is turned on and the voltage to the second polarization conversion liquid crystal plate 15 is turned off, so that the R, G, and B pixels of the LCD 11 are set to the above-mentioned. For the sampling timing m of 1 pixel pitch (x)
The video signal at the shifted timing m + x is supplied. In this case, the image on the LCD 11 is shifted by one pixel pitch from the image at the timing m, but since the image is transmitted through the first polarization conversion liquid crystal plate 13 as it is, the first image is transmitted. The birefringent plate 14 shifts the optical axis by one pixel pitch (x) in the direction opposite to the image shift direction due to the sampling timing and transmits the light, and then the second polarization conversion liquid crystal plate 15 shifts the polarization direction to 90 degrees. It is rotated by ° and transmitted through the second birefringent plate 16 as it is.

Next, the first and second polarization conversion liquid crystal plates 1
The voltages to the pixels 3 and 15 are turned on, and the sampling timing m is set to each of the R, G, and B pixels of the LCD 11.
In contrast, a video signal of timing m + 2x shifted by 2 pixel pitch (2x) is supplied. In this case, the LCD 11
The image above is shifted by two pixel pitches from the image at the timing m, but since the image passes through the first polarization conversion liquid crystal plate 13 as it is, the first birefringent plate At 14, the optical axis is shifted by one pixel pitch (x) in the direction opposite to the direction in which the image is displaced due to the sampling timing, and then transmitted, and then the second polarization conversion liquid crystal plate 15 is transmitted as it is. In the birefringent plate 16, the optical axis is further shifted by one pixel pitch (x) in the direction opposite to the image shift direction due to the sampling timing. That is,
In the display image on the LCD 11, the optical axis of each pixel is shifted by 2 pixel pitches (2x) in total in the direction opposite to the image shift direction due to the sampling timing and is transmitted.

In this way, the observed image is as shown in FIG.
As shown in B and C as a part of the observation pixel array, different images of R, G, and B with time at the same pixel position,
That is, since each color of R, G, B can be observed with one pixel, the resolution can be improved three times.

Here, the switching cycle of sequential video signals,
That is, the picture switching cycle is 1/30 second (1
It can be set to 1/60 second (corresponding to 1 field) or 1/60 second.
It may be / 90 seconds, 1/120 seconds, or 1/180 seconds. In addition, the faster the switching cycle, the more L
A CD 11 having a fast response time, 8 ms, 4 ms, 2.7 ms, 2 ms, 1.
A response time of 3 ms or less is required.

The high resolution method of this embodiment is particularly shown in FIG.
It can be effectively applied to a head-mounted image display device (hereinafter, referred to as HMD) as shown in FIG. H shown in FIG.
The MD has a display device main body 21, a temporal frame 22 and a parietal frame 23, and by mounting the temporal frame 22 and the parietal frame 23 on the head of an observer 24, the display device main body 21 becomes visible. It is designed to be held on 24 faces. A rear frame 26 is attached to the temporal frame 22 via a leaf spring 25, and a speaker 27 is provided on the rear frame 26 in correspondence with the position of the observer's ear.

A playback device 29 is connected to the display device main body 21 via a cable 28.
A required video signal from 9 is supplied to the display device main body 21, and a corresponding audio signal is supplied to the speaker 27. The reproducing device 29 is provided with an adjusting means 30 such as a volume so that the level of the audio signal can be adjusted.

The display device main body 21 is provided with an optical system as shown in FIG. 5A or 5B corresponding to each eyeball of the observer 24. The optical system shown in FIG. 5A is of a see-through type, and the display image on the LCD 31 is transmitted through the half mirror prism 32, reflected by the concave mirror 33, further reflected by the half mirror prism 32, and enlarged to the corresponding eyeball. While guiding, an external image is displayed, for example, on the liquid crystal shutter 3
4 and the half mirror prism 32 to guide to the corresponding eyeball. Further, the optical system shown in FIG. 5B is configured to guide the image displayed on the LCD 35 to the corresponding eyeball through the eyepiece lens 36.

In the HMD shown in FIG. 4, a stereoscopic image can be observed by supplying a video signal having parallax to an optical system corresponding to the left and right eyes to display the video signal. In addition, in FIG. 4, the display device main body 21 is
The video can be displayed by connecting to an existing VCR or TV tuner via the cable 28, or it can be connected to a computer or the like to display computer graphics images or message images from the computer. Can also be displayed. Further, without using the cable 28, an antenna may be provided in the display device main body 21 so that a signal from the outside can be received by radio waves and displayed.

In the above HMD, the LCD constituting the optical system is as small as 1.3 inches. Most of the small LCDs currently on the market have at most 300,000 pixels. However, the wide angle HM
In D, there is a need to further increase the number of pixels.

Therefore, if the high resolution method described in the above embodiment is applied to such an HMD, the number of pixels of the LCD can be effectively tripled, which is very effective.

FIG. 6 shows a second embodiment of the present invention. In this embodiment, a piezoelectric element 41 is used as the optical axis shifting means, whereby the LCD 11 having the same structure as in the first embodiment is directly displaced to achieve high resolution. The piezoelectric element 41 is adhered to the LCD 11 and driven by the piezoelectric element driver circuit 42 based on the synchronizing signal separated from the video signal.

In this embodiment, as in the first embodiment, first, the LCD 11 is not displaced and the LCD
Sampling timing m for each R, G, B pixel of 11
The image signal is supplied to display the image. Next, LCD1
A video signal at a timing m + x shifted by one pixel pitch (x) with respect to the sampling timing m is supplied to each R, G, B pixel of 1 and a piezoelectric element driver is based on a synchronizing signal at that time. By the piezoelectric element 41 via the circuit 42, the LCD 11 is shifted by one pixel pitch (x) in the direction opposite to the image shift direction due to the sampling timing. After that, R, G, B of LCD 11
For each pixel of the sampling timing m,
A video signal of timing m + 2x shifted by 2 pixel pitch (2x) is supplied, and the piezoelectric element 41 causes the LCD 11 to shift by 2 pixel pitch in the direction opposite to the image shift direction due to the sampling timing based on the synchronizing signal at that time. (2x) Shift.

By doing so, as in the first embodiment, since images of different R, G, B are observed at the same pixel position over time, the resolution can be improved three times.

In the third embodiment of the present invention, in the first embodiment or the second embodiment, when the pixel shift is performed by selectively shifting the optical axis of the image on the display element by the optical axis shift means, the pixel is shifted. No image is displayed on the display element at the moment of shifting, that is, black is displayed. For example,
As shown in FIG. 7, when the pictures of the picture 1 and the picture 2 having different sampling timings are continuously displayed on the display device, the picture 1 and the picture 2 are displayed.
Insert a black picture between and.

FIG. 8 shows changes in the image on the display device according to this embodiment. As shown in FIG. 8, at a certain time t1, picture 1 is displayed on the display element, and at time t2, the black image is gradually rewritten from the top, and at time t3.
Will be a black video at all. At this moment, pixel shifting is performed, and the picture 2 is gradually rewritten at time t4, and the picture of picture 2 is completely displayed at time t5.
In this way, since there is no moment when the picture 1 and the picture 2 are displayed at the same time, the picture 1 and the picture 2 can be completely separated and the pixels can be shifted, and the resolution can be improved.

In the third embodiment, since the black image is displayed at the moment when the pixel shift is performed, the flicker due to the black display may be a problem. In the fourth embodiment of the present invention,
To prevent this black display flickering, instead of displaying the pixel-shifted image and the pixel-unshifted image alternately, the shifted image → the unshifted image → the unshifted image → the shifted image → the shifted image In addition to controlling the pixel shift, the black image is displayed when the shift state is changed in the pixel shift control. By controlling in this way, the period for displaying the black image is doubled, so that the flicker can be reduced.

FIG. 9 shows the change of the image on the display device according to this embodiment, showing the image without shifting the picture 1 and the shifting images with the pictures 2 and 3.
That is, in this embodiment, the shift is not performed while the picture 1 is displayed (OFF), and the shift control (ON) is performed when the entire black display is performed between the picture 1 and the picture 2 (time t3). After the switching, the picture 2 and the picture 3 are sequentially displayed by the shift control, and the control is switched to the non-shift control (OFF) between the picture 3 and the next picture.

FIG. 10 is a diagram for explaining the fifth embodiment of the present invention. In this embodiment, when the fourth embodiment is applied to the HMD shown in FIG. 4, flicker due to black display is more effectively suppressed. Therefore, in this embodiment, the timing for displaying an image is set to 1/4 of the picture display cycle in the left and right optical systems.
Is shifted by Δt corresponding to. Also, the black image display is 3Δ
Shift by t. By doing so, black is not displayed entirely on the left and right optical systems at the same time, so that it is possible to more effectively suppress flickering due to black display.

FIG. 11 is a block diagram showing an example of the circuit configuration in the fifth embodiment, showing the case where the left and right optical systems of the HMD each have the optical axis shifting means of the configuration shown in FIG. A video signal from a video reproducer (not shown) is separated into a sync signal and a video signal by a sync separation circuit 51, and the separated video signal is separated into a left and right video signal by a left / right separation circuit 52. The left video signal separated by the left / right separation circuit 52 is stored in the frame memory 53L, and the right video signal is delayed by Δt in the Δt delay circuit 60 and stored in the frame memory 53R. The left video signal stored in the frame memory 53L is supplied to the switch circuit 54L and the left L.
The signal is supplied to the LCD of the left optical system (not shown) via the CD drive circuit 55L, and similarly, the frame memory 5
The right video signal stored in 3R is supplied to the LCD of the right optical system (not shown) via the switch circuit 54R and the right LCD drive circuit 55R.

On the other hand, the sync signal separated by the sync separation circuit 51 is supplied to the switch control circuit 56, where a control signal synchronized with 6Δt is generated based on the input sync signal. This control signal is supplied to the switch circuit 54L, the sampling control circuit 57L, and the left liquid crystal control circuit 58L, and is delayed by 3Δt in the 3Δt delay circuit 59 to the switch circuit 54R, the sampling control circuit 57R, and the left liquid crystal control circuit 58R. Supply.

In this way, the switch circuit 54 is synchronized with the control signal from the switch control circuit 56 every 6Δt.
L is turned off, a black image is displayed on the LCD of the left optical system, and the left LCD by the sampling control circuit 57L is displayed.
The sampling timing of the left video signal in the drive circuit 55L and the voltage of the first and second polarization conversion liquid crystal plates 13 and 15 (see FIG. 1) of the left optical system by the left liquid crystal control circuit 58L according to the sampling timing Control the application. Similarly, in synchronization with the control signal from the switch control circuit 56, the switch circuit 54R is turned off every 6Δt to display a black image on the LCD of the right optical system, and the right LCD drive circuit 55R by the sampling control circuit 57R. Of the sampling timing of the right video signal in FIG. 8 and the application of voltage to the first and second polarization conversion liquid crystal plates 13 and 15 (see FIG. 1) of the right optical system by the right liquid crystal control circuit 58R according to the sampling timing. To do so.

Here, the left and right LCDs display a black image every 6Δt, but since the 3Δt delay circuit 59 controls the switch circuits 54L and 54R by 3Δt, the left and right LCDs are controlled. The black image display by means is alternately performed every 3Δt.

FIG. 12 shows a sixth embodiment of the present invention. In this embodiment, a scanning illumination light source 62 is used as a backlight in the configuration shown in FIG. 1, and the scanning illumination light source 62 is driven by a scanning illumination light source drive circuit (not shown) on the basis of a synchronizing signal to the LCD 11.
11 is configured to drive and scan so as to illuminate the line which is being scan-displayed, and since other configurations and operations are the same as those in the first embodiment, description thereof will be omitted. As the scanning illumination light source 62, for example, a CRT, electroluminescence display, plasma display or the like can be used.

As described above, if the displayed line is illuminated in synchronization with the scanning display on the LCD 11, different pictures are not displayed at the same time, so that the resolution can be increased.

FIG. 13 shows an essential part of the seventh embodiment of the present invention. In this embodiment, in FIG. 12, the scanning illumination light source 62 comprises a point light source 63, a cylindrical lens 64 and a polygon mirror 65, and the polygon mirror 65 is rotated in synchronization with the scanning display on the LCD 11, A light beam emitted from the point light source 63 and converted into a line shape by the cylindrical lens 64 is reflected by the polygon mirror 65 to illuminate the line displayed by scanning on the LCD 11.

12 and 13, the illumination width of the LCD 11 by the scanning illumination light source 62 does not necessarily have to match the line width of the LCD 11. For example, the illumination width is 50 times or less the line width of the LCD 11. If so, the effect can be sufficiently exerted. In particular, in the case of FIG. 12, the scanning illumination width of the scanning illumination light source 62 is set to the LCD 1
By setting the line width of 1 to approximately twice or more and 50 times or less, the scanning illumination system can be inexpensive while maintaining the effect of improving the resolution.

When pixel shifting is performed using a display element having a strong afterimage, such as an LCD, as in the above-described embodiment, the resolution of the line being scanned becomes the highest at the moment the pixel shifting is performed. The resolution decreases as the distance from the line increases and decreases. Therefore, in the eighth embodiment of the present invention, the average resolution on the entire display surface is increased by changing the pixel shift timing.

FIGS. 14A, 14B, and 14C show the manner in which the image changes on the LCD according to the eighth embodiment and the timing at which pixel shifting is performed. FIG. 14A shows a case where a pixel is shifted when a new picture 2 rewrites a line of about 1/6 of the LCD display surface. In this case, the resolution is highest at the upper side. FIG. 14B shows a case where the pixel shift is performed when the new picture 6 rewrites about half of the line on the LCD display surface. In this case, the center line has the highest resolution. FIG.
In C, the new picture 10 is about 5/6 of the LCD display surface.
The case where the pixel shift is performed when rewriting the line is shown. In this case, the lower line has the highest resolution. In this embodiment, the three timings shown in FIGS. 14A, 14B, and 14C are periodically repeated to increase the resolution of the entire screen by time averaging.

FIG. 15 shows an example of the configuration of a circuit for performing the operation shown in FIG. This circuit example is applied to the HMD shown in FIG. 4, and shows the case where the left and right optical systems of the HMD respectively have the optical axis shifting means having the configuration shown in FIG. A video signal from a video reproducer (not shown) is separated into a sync signal and a video signal by a sync separation circuit 71, and the separated video signal is separated into a left and right video signal by a left / right separation circuit 72. The left video signal separated by the left / right separation circuit 72 is supplied to the LCD of the left optical system (not shown) via the left LCD drive circuit 73L.
Similarly, the right video signal is supplied to the LCD of the right optical system (not shown) via the right LCD drive circuit 73R.

On the other hand, the sync signal separated by the sync separation circuit 71 is supplied to the sampling control circuit 74L and the sampling control circuit 74R, and also supplied to the counter 75L, and further passed through the 8Δt delay circuit 76 and the counter 75.
Supply to R. The output of the counter 75L is supplied to the left liquid crystal control circuit 77L that controls the application of the voltage of the first and second polarization conversion liquid crystal plates 13 and 15 (see FIG. 1) of the left optical system, and the counter 75L outputs. Similarly, the output is supplied to the right liquid crystal control circuit 77R that controls the application of the voltage to the first and second polarization conversion liquid crystal plates of the right optical system.

In this way, in the left optical system, the sampling control circuit 74L controls the sampling timing of the left image signal in the left LCD drive circuit 73L based on the synchronizing signal to display an image shifted by a pixel. , The synchronization signal is counted by the counter 75L, and the left liquid crystal control circuit 77L is counted based on the count value.
The application of the voltage to the first and second polarization conversion liquid crystal plates is controlled to control the timing of switching the polarization direction of the image from the LCD, as described with reference to FIG.

Similarly, in the right optical system as well, the sampling control circuit 74R controls the sampling timing of the right video signal in the right LCD drive circuit 73R based on the synchronizing signal to display an image shifted by a pixel and The synchronization signal is counted by the counter 75R, and the application of the voltage to the first and second polarization conversion liquid crystal plates by the right liquid crystal control circuit 77R is controlled based on the count value.
As described in FIG. 14, the timing of switching the polarization direction of the image from the LCD is controlled.

As described above, by changing the pixel shift timing, the average resolution on the entire display surface can be increased even when an LCD having a strong afterimage is used. Further, in FIG. 15, the 8Δt delay circuit 76
8 to the synchronization signal supplied to the counters 75L and 75R
Since the difference of Δt is provided, the switching timings of the polarization directions in the left and right optical systems are different. Therefore, the flicker of the change in resolution due to changing the timing can be effectively suppressed.

In the circuit configuration shown in FIG.
The optical axis shift means having the structure shown in FIG. 1 was used.
Here, the first and the first constituting the optical axis shifting means shown in FIG.
Each of the second polarization conversion liquid crystal plates 13 and 15 is configured to shift the pixels on the entire screen at the same time by using one electrode plate.

However, as in the eighth embodiment, when the pixel shift timing is changed, a polarization conversion liquid crystal plate having line type electrodes is used,
It is also possible to perform pixel shifting by controlling each line according to the scanning timing of the LCD. The configuration in this case is shown in FIG. 16 as a ninth embodiment.

The display device shown in FIG. 16 has the same structure as that shown in FIG.
3 and 15, line type first and second polarization conversion liquid crystal plates 81 and 82 are used, and these are controlled line by line by corresponding liquid crystal control circuits (not shown) to shift pixels. The other configuration is the first
This is the same as the embodiment. The number of lines of each of the first and second polarization conversion liquid crystal plates 81 and 82 does not necessarily have to be the same as the number of lines of the LCD 11, and if it is at least ⅓ of the number of lines of the LCD 11, the display is performed. The average resolution on the entire surface can be increased.

In each of the above embodiments, the pixels are shifted in the horizontal direction. When moving pixels in the horizontal direction like this, when the shifting cycle is slow, the screen appears to be flowing, or when displaying a moving image at the same speed as the shifting speed, color moire may occur. become. Therefore, in the tenth embodiment of the present invention, in each of the above-described embodiments, the pixel shift amount is, as shown in FIG. 17, a shift amount 0 → a shift amount 1 → a shift amount 2 → a shift amount 1 → a shift amount 0. The shift amount is changed to 2, the shift amount is 0, the shift amount is 1, and so on. In this way, by disturbing the periodicity of the pixel shift amount, it is possible to effectively prevent the flow of the screen and the occurrence of color moire.

Such pixel shifting is performed by the line type first and second lines as in the ninth embodiment shown in FIG.
When the polarization conversion liquid crystal plates 81 and 82 are used, for example, the shift amount is 0 in the line m, the shift amount is 1 and the shift amount is 2, and the shift amount is 0 in the line (m + 1).
It is also possible to change the shift method for each line so that the shift amount becomes 2 and then the shift amount becomes 1. By doing so, it is possible to effectively prevent the occurrence of screen flow on the entire display surface and also effectively suppress the occurrence of color moire.

Further, when applied to the HMD shown in FIG. 4, it is possible to change the way of shifting the LCDs of the left and right optical systems. For example, in the left LCD, the shift amount is 0 → the shift amount 1 → the shift amount 2 and in the right LCD, the shift amount is 0 → the shift amount 2 → the shift amount 1 in the order. In this way, it is possible to effectively prevent the occurrence of screen flow on the entire display surface when observing with both eyes, and also effectively suppress the occurrence of color moire.

In each of the above-mentioned embodiments, the LCD which horizontally scans so as to sequentially display the image from the top to the bottom of the screen is used, but in the eleventh embodiment of the present invention, as shown in FIG. As the LCD 85, one having R, G, and B pixels arranged in a matrix in a delta pattern and scanning in the vertical direction with respect to a display image is used.
As shown in FIG. 9, the images are sequentially displayed from left to right on the screen. Further, as in FIG. 1, the backlight 12 that emits white light is disposed on the back side of the LCD 85, and the first polarization conversion liquid crystal plate 13 and the first polarization conversion liquid crystal plate 13 that configure the optical axis shift means are disposed on the front side. The birefringent plate 14, the second polarization conversion liquid crystal plate 15 and the second birefringent plate 16 are sequentially arranged. In this embodiment, since the scanning is performed in the horizontal direction, the optical axis shift means shifts the optical axis by 90 ° which is different from that in the above-described embodiments.

In this way, similarly to the above-described embodiment, the images having different sampling timings for the pixel pitch are sequentially displayed on the LCD 85, and the image at the sampling timing is synchronized with the display of the images by the optical axis shift means. Switching is performed so as to shift the optical axis of each pixel by the pixel pitch in the direction opposite to the shift direction.

According to this embodiment, it is possible to increase the resolution of the scanning column at the timing of pixel shifting. Here, in general, when an observer watches TV,
As is clear from the gazing point distribution shown in FIG. 20 (excerpted from the Television Image and Information Engineering Handbook, edited by the Television Society, Ohmsha, 1st edition, 1st printing, page 45), attention is paid to the upper and lower parts in the vicinity of the center. I often do it. Therefore, for example, if the pixel shift is performed while the LCD 85 is scanning the central column, the resolution of the central column can be maximized as shown in FIG. There is an advantage that the resolution of the area can be increased.

An LCD for scanning in the horizontal direction
85 can be used to form the same as in the second to tenth embodiments. Of course, in these cases, the pixel shift direction and the optical axis shift directions opposite thereto are the column directions.

FIG. 22 shows a twelfth embodiment of the present invention, which is applied to a video camera. This video camera has an image pickup system 91 for picking up an image, a display system 92 for observing a picked up image, and a recording device 93 for recording the picked up image. The imaging system 91 converts light from a subject (not shown) to be imaged into linearly polarized light by the polarizing plate 94, and takes an image of the image by the taking lens 95 as a first polarization conversion element 96 that constitutes an imaging optical axis shift means. An image is formed on the image sensor 100 via the first birefringent plate 97, the second polarization conversion element 98, and the second birefringent plate 99. here,
The image sensor 100 uses, for example, a CCD in which R, G, and B pixels are arranged in a matrix.

Further, the display system 92 has a display element 101 for displaying an image, and a third polarization conversion element 102, a third birefringent plate 103, and a third birefringent plate 103, which constitute the display optical axis shifting means for displaying the displayed image. The fourth polarization conversion element 104 and the fourth birefringent plate 105 are used for observation. Here, the display element 101 is formed by arranging pixels of R, G, and B in a matrix like the image pickup element 100, for example, L.
Use a CD.

In this embodiment, the first and second imaging systems 91 are used.
The polarization conversion elements 96 and 98 and the third and fourth polarization conversion elements 102 and 104 of the display system 92 are synchronously driven by the polarization conversion element drive circuit 106 to shift the pixels in the opposite direction, The video signal from the image pickup device 100 is supplied to the recording device 93 for recording and is also supplied to the display device 101 via the display device drive circuit 107 for display.

In this way, the image pickup system 91 side can sequentially obtain the R, G, and B video signals corresponding to the respective points of the subject, so that the resolution of the image pickup device 100 can be increased. At the same time, on the display system 92 side, R, G, and B images can be sequentially observed at pixel positions corresponding to respective points of the subject, so that the resolution of the display element 101 can be increased as in the above-described embodiment. it can.

It should be noted that the present invention is not limited to the above-described embodiments, but many variations and modifications are possible. For example, in each of the above-described embodiments, pixel shift, no pixel shift, one pixel shift, and two pixel shift are selectively performed on the display element in accordance with the array of R, G, B sequential pixels, and the pixel shift is performed according to the pixel shift. The optical axis shift means shifts the optical axis in the direction opposite to the pixel shift.
When the R, G, and B pixels are repeatedly arranged in that order, pixel shifting of 1.5 pixels is selectively performed,
Accordingly, it is possible to shift the optical axis by 1.5 pixels in the direction opposite to the pixel shift. By doing so, it is possible to obtain an observation image in which pixels are interpolated with pixels of different colors in a sequential picture, so that the resolution can be more effectively increased. In this case, the optical axis shift means can be composed of one polarization conversion element and one birefringent plate.

Further, as shown in FIG. 23, the present invention is also applicable to the case of displaying an image by shifting the pixels selectively by 1/2 pixel pitch in the scanning direction, or the case of displaying an image by interlaced scanning. It can be effectively applied. Of course, also in these cases, the optical axis shift means can be composed of one polarization conversion element and one birefringent plate. Note that in the case of interlaced scanning, the optical axis of the image is 1/2 pixel in the direction orthogonal to the scanning direction of the image signal on the display element, or in accordance with the sampling timing of the image signal of the sequential field. The pixel may be further shifted by 1/2 pixel in the scanning direction from the orthogonal direction.

Appendix 1. The display device according to claim 1, wherein the display element has three types of R, G, and B pixels arranged periodically.
The display device, wherein the optical axis shift means shifts the optical axis so that the optical axes of the R, G and B pixels coincide with each other. According to such a display device, the resolution can be tripled by using a normal full-color display element. 2. In the display device according to appendix 1, the optical axis shift means includes first and second polarization conversion elements that selectively convert the polarization of light and first and second polarization conversion elements that shift the optical axis according to the polarization. A birefringent plate, and a
The display device in which the polarization conversion element, the first birefringence plate, the second polarization conversion element, and the second birefringence plate are arranged in this order. According to such a display device, the optical axis can be shifted only by converting the incident polarized light to the first and second birefringent plates by the first and second polarization conversion elements, so that the mechanical mechanism is It is not necessary and the apparatus can be downsized, and the shift amount of the optical axis in each birefringent plate is determined by the thickness of the birefringent plate, so that the reproducibility of the shift amount is also good. 3. 3. The display device according to claim 2, wherein the crystal axis of the TiO ₂ birefringent plate is tilted by approximately 45 ° with respect to the plane of the birefringent plate. According to such a display device, the light emitted from the birefringent plate 2
Since the two optical axes are parallel to each other, the shift amounts of the two optical axes are constant regardless of the distance from the display element. Therefore,
The arrangement of the display element and the birefringent plate can be given a degree of freedom. 4. The display device according to claim 3, wherein the optical axis shift means repeats ON / OFF / OFF / ON of the optical axis shift operation in accordance with the change of the display screen. According to such a display device, compared to the case where the optical axis shift operation is repeated in the order of ON / OFF / ON / OFF,
Flickering can be effectively suppressed because the time during which an image is not displayed on the display element can be halved. 5. In a display device having a first display element and a second display element for respectively displaying images guided to both eyes of an observer, a first device for selectively shifting an optical axis of an image on the first display element. Optical axis shifting means, second optical axis shifting means for selectively shifting the optical axis of the image on the second display element, and turning on / off of the optical axis shifting by the first optical axis shifting means. In synchronization with the operation, the first image shift control means for selectively shifting the image displayed on the first display element and the on / off operation of the optical axis shift by the second optical axis shift means are synchronized. And a second image shift control means for selectively shifting the image displayed on the second display element, wherein the first optical axis shift means shifts the optical axis according to the change of the display screen. Repeated on / off / off / on operation It said second optical axis shifting means,
According to the change of the display screen, ON / OFF / OFF is repeated corresponding to ON / OFF / ON / OFF of the optical axis shift operation by the first optical axis shift means, and the first and second optical axes are shifted. The display device is configured so as not to display an image on the corresponding first and second display elements when switching the respective optical axis shifts by the optical axis shift means. According to such a display device, in the binocular display, the timing at which the image is not displayed on the left and right display elements is shifted, so that the flicker can be suppressed more effectively. 6. 5. The display device according to claim 4, wherein the scanning illumination means has a scanning line width which is approximately twice or more and 50 times or less the scanning line width of the liquid crystal display element. According to such a display device, the scanning illumination system can be made inexpensive while maintaining the effect of improving the resolution. 7. 5. The display device according to claim 4, wherein the optical axis shift means includes first and second polarization conversion elements that selectively convert the polarization of light, and first and second polarization axes that shift the optical axis according to the polarization.
A birefringent plate, and the first polarization conversion element, the first birefringence plate, the second polarization conversion element, and the second birefringence plate are arranged in this order from the display surface side of the display element. A display device characterized by. According to such a display device, the optical axis can be shifted only by converting the incident polarized light to the first and second birefringent plates by the first and second polarization conversion elements, so that the mechanical mechanism is It is not necessary and the apparatus can be downsized, and the shift amount of the optical axis in each birefringent plate is determined by the thickness of the birefringent plate, so that the reproducibility of the shift amount is also good. 8. 6. The display device according to claim 5, wherein an optical axis shift on / off switching timing by the optical axis shift means is set to about 1/6, about 1/2 and about 5 / of a rewriting cycle of a video signal for the display element. 6. A display device characterized in that According to such a display device, the resolution of the entire screen can be uniformly increased. 9. 6. The display device according to claim 5, wherein the optical axis shift means includes first and second polarization conversion elements that selectively convert the polarization of light, and first and second polarization axes that shift the optical axis according to the polarization.
A birefringent plate, and the first polarization conversion element, the first birefringence plate, the second polarization conversion element, and the second birefringence plate are arranged in this order from the display surface side of the display element. A display device characterized by. According to such a display device, the optical axis can be shifted only by converting the incident polarized light to the first and second birefringent plates by the first and second polarization conversion elements, so that the mechanical mechanism is It is not necessary and the apparatus can be downsized, and the shift amount of the optical axis in each birefringent plate is determined by the thickness of the birefringent plate, so that the reproducibility of the shift amount is also good. 10. 7. The display device according to claim 6, wherein the selection pattern of the first axis, the second axis and the third axis by the optical axis shift means is set to a first axis, a second axis, a third axis, Second
The display device is characterized in that the axis of, the first axis, and the third axis are arranged in this order. According to such a display device, the selection pattern is
Other order, for example, first axis, second axis, third axis,
Compared with the case where the third axis, the second axis, and the first axis are arranged in this order, the flicker of color change during color image display can be effectively suppressed. 11. 7. The display device according to claim 6, wherein the optical axis shift means includes first and second polarization conversion elements that selectively convert the polarization of light, and first and second polarization axes that shift the optical axis according to the polarization. Having a birefringent plate, from the display surface side of the display element,
A display device in which a first polarization conversion element, a first birefringent plate, a second polarization conversion element, and a second birefringent plate are arranged in this order. According to such a display device, the optical axis can be shifted only by converting the incident polarized light to the first and second birefringent plates by the first and second polarization conversion elements.
A mechanical mechanism is not required, the apparatus can be downsized, and the shift amount of the optical axis in each birefringent plate is determined by the thickness of the birefringent plate, so that the reproducibility of the shift amount is improved. 12. In a display device having a plurality of pixels arranged in a matrix and displaying the image by scanning these pixels with a video signal, a display surface of the display device is divided into a plurality of regions, An optical axis shift unit that selectively shifts the optical axis of the image of each region to the first axis, the second axis, and the third axis, and in synchronization with the operation of the optical axis shift unit,
Image shift control means for selectively shifting an image displayed on the display element from a first shift amount, a second shift amount, and a third shift amount, and in a sequential region of the display surface. A display device characterized in that selection patterns of the first axis, the second axis and the third axis by the optical axis shift means are different. According to such a display device, since the optical axis shift selection pattern is different for each image area, the entire screen does not appear to be flowing. 13. In a display device having a first display element and a second display element that respectively display an image guided to both eyes of an observer, the optical axis of the image on the first display element is set to the first
Optical axis shift means for selectively shifting to the second axis, the second axis and the third axis, and the optical axis of the image on the second display element as the first axis and the second axis. And a second optical axis shift means for selectively shifting to the third axis, and an image displayed on the display element in synchronization with the operations of the first optical axis shift means, by a first shift amount. An image displayed on the display element in synchronism with the operations of the first image shift control means for selectively shifting the second shift amount and the third shift amount and the second optical axis shift means. And a second image shift control means for selectively shifting the first image from the first shift amount, the second shift amount, and the third shift amount. Pattern of the axes, the second axis and the third axis, and the first optical axis shift means The display apparatus characterized by the selection pattern of the second axis and the third axis is configured differently. According to such a display device, the flow of the screen on the left and right display elements can be made different, so that the flow of the screen when observing an image with both eyes can be avoided. 14． 8. The display device according to claim 7, wherein the optical axis shift means includes first and second polarization conversion elements that selectively convert the polarization of light, and first and second polarization axes that shift the optical axis according to the polarization. Having a birefringent plate, from the display surface side of the display element,
A display device in which a first polarization conversion element, a first birefringent plate, a second polarization conversion element, and a second birefringent plate are arranged in this order. According to such a display device, the optical axis can be shifted only by converting the incident polarized light to the first and second birefringent plates by the first and second polarization conversion elements.
A mechanical mechanism is not required, the apparatus can be downsized, and the shift amount of the optical axis in each birefringent plate is determined by the thickness of the birefringent plate, so that the reproducibility of the shift amount is improved. 15. 9. The display device according to claim 8, wherein the image pickup optical axis shift means shifts the optical axis according to the polarized light, and first and second polarization conversion elements that selectively convert the polarized light of the light from the subject. A first polarization conversion element, a first birefringence plate, a second polarization conversion element, and a second birefringence plate are arranged in this order from the subject side. The display optical axis shift means includes third and fourth polarization conversion elements that selectively convert the polarization of light from the display element, and third and fourth birefringence elements that shift the optical axis according to the polarization. A third polarization conversion element, a third birefringence plate, a fourth polarization conversion element, and a fourth birefringence plate are arranged in this order from the display surface side of the display element. Display device. According to such a display device, on the image sensor side, the optical axis can be shifted only by converting the incident polarized light to the first and second birefringent plates by the first and second polarization conversion elements. On the display element side, the incident polarized light to the third and fourth birefringent plates is
The optical axis can be shifted simply by performing conversion with the third and fourth polarization conversion elements, so that no mechanical mechanism is required for each, the device can be downsized, and the optical axis shift amount in each birefringent plate can be reduced. Is determined by the thickness of the birefringent plate, so that the reproducibility of the shift amount is good.

[0086]

According to the first aspect of the present invention, even if the pixels on the display element are arranged in a delta arrangement, one pixel can apparently reproduce a plurality of colors, so that the resolution can be improved. You can

According to the second aspect of the present invention, by using the birefringent plate made of TiO ₂ , the optical axis of the image on the display element is shifted, that is, the pixel is shifted to achieve high resolution. Since the birefringent plate is easily processed, the birefringent plate can be manufactured easily and inexpensively as compared with the case of using another type of birefringent plate, and the entire device can be downsized.

According to the third aspect of the present invention, different images that are shifted from each other are not observed at the same time. Therefore, even when a display element having a memory effect is used, the resolution is effective by shifting the pixels. Can be improved.

According to the fourth aspect of the present invention, different images that are shifted from each other are not observed at the same time, so that the resolution can be effectively improved by shifting the pixels using the liquid crystal display element.

According to the fifth aspect of the invention, since the display line with high resolution changes due to the change of the switching timing of the optical axis shift, even when a display element having a memory effect is used, it is possible to shift the pixel by shifting the pixel. The resolution of the entire display surface can be effectively improved.

According to the sixth aspect of the invention, the optical axis of the image displayed on the display element is selectively moved to the first axis, the second axis and the third axis by the optical axis shift means. The image that is shifted and displayed on the display element in synchronization with the shift operation is shifted by the image shift control means by the first shift amount,
Since the second shift amount and the third shift amount are selectively shifted, even if a display element having a memory effect is used, the pixel shift can effectively improve the resolution of the entire display surface. . Further, since the selection patterns of the first axis, the second axis, and the third axis by the optical axis shift means are sequentially changed, it is effective to generate the flow of the observation image which is likely to occur when the predetermined order is repeated. Can be prevented.

According to the seventh aspect of the invention, the optical axis of the image displayed on the display element is selectively shifted by the optical axis shift means, and the image shift control means synchronizes with the shift operation. , The image displayed on the display element is selectively shifted. Moreover, the display element displays a video by horizontally scanning successive columns according to the video signal, and the optical axis of the video is shifted by the optical axis shift means during the display scanning. Even if an effective one is used, it is possible to effectively improve the resolution of the entire display surface by shifting the pixel. Especially, by performing the optical axis shift while scanning the center of the screen, the observer can see the image. It is possible to effectively increase the resolution of the central region which is easy to see when looking.

According to the invention described in claim 8, the optical axis of the light incident on the image pickup device and the optical axis of the image on the display device are shifted by the respective optical axis shift means, and the image signal from the image pickup device is obtained. Is displayed on the display element, the resolutions of the image sensor and the display element can be improved without using an expensive frame memory.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the first embodiment.

FIG. 3 is likewise a diagram for explaining the operation of the first embodiment.

FIG. 4 is a diagram showing a configuration of an example of a head-mounted image display device to which the first embodiment can be applied.

5A and 5B are diagrams showing two examples of an optical system of the head-mounted image display device shown in FIG.

FIG. 6 is a diagram showing a second embodiment of the present invention.

FIG. 7 is a diagram for explaining a third embodiment of the present invention.

FIG. 8 is likewise a diagram for explaining the third embodiment.

FIG. 9 is a diagram for explaining the fourth embodiment of the present invention.

FIG. 10 is also a diagram for explaining the fifth embodiment.

FIG. 11 is a block diagram showing an example of a circuit configuration of a fifth embodiment.

FIG. 12 is a diagram showing a sixth embodiment of the present invention.

FIG. 13 is also a diagram showing the configuration of the main part of the seventh embodiment.

FIG. 14 is likewise a diagram for explaining the eighth embodiment.

FIG. 15 is a block diagram showing an example of a circuit configuration of an eighth embodiment.

FIG. 16 is a diagram showing a ninth embodiment of the present invention.

FIG. 17 is also a diagram for explaining the tenth embodiment.

FIG. 18 is a drawing which similarly shows an eleventh embodiment.

FIG. 19 is a diagram for explaining the operation of the eleventh embodiment.

FIG. 20 is a diagram showing a gazing point distribution when an observer watches TV.

FIG. 21 is a diagram for explaining resolution in the eleventh embodiment.

FIG. 22 is a diagram showing a twelfth embodiment of the present invention.

FIG. 23 is a diagram showing a conventional display device.

FIG. 24 is a diagram for explaining the operation of FIG. 23.

[Explanation of symbols]

 11 liquid crystal panel (LCD) 12 backlight 13 first polarization conversion liquid crystal plate 14 first birefringence plate 15 second polarization conversion liquid crystal plate 16 second birefringence plate

Claims (8)

[Claims] 1. A display device having a display element in which a plurality of pixels emitting different colors are arranged, and an optical axis of an image on the display element is selectively shifted in proportion to an arrangement pitch of the pixels. An optical axis shift means and an image shift control means for selectively shifting an image displayed on the display element in a direction opposite to the optical axis shift direction in synchronization with the operation of the optical axis shift means. A display device characterized by the above. 2. A display element for displaying an image, a polarization conversion means for selectively converting the polarization of light emitted from the display element, and light of the image on the display element according to the polarization by the polarization conversion means. A birefringent plate made of TiO ₂ for selectively shifting the axis, and an image shift control means for selectively shifting an image displayed on the display element in synchronization with the operation of the polarization conversion means. Characteristic display device. 3. A display device having a plurality of pixels arranged in a matrix and displaying the image by scanning these pixels with a video signal, wherein an optical axis of the image on the display element is selected. And an image shift control means for selectively shifting the image displayed on the display element in synchronization with the on / off operation of the optical axis shift by the optical axis shift means. , When switching the optical axis shift by the optical axis shift means,
A display device, characterized in that it is configured not to display an image on the display element. 4. A display device having a plurality of pixels arranged in a matrix and displaying the image by scanning these pixels with a video signal, wherein an optical axis of the image on the liquid crystal display element is provided. An optical axis shift means for selectively shifting the optical axis shift means, an image shift control means for selectively shifting an image displayed on the liquid crystal display element in synchronization with the operation of the optical axis shift means, A display device, comprising: a scanning illumination unit that scans and illuminates the liquid crystal display element in synchronization with a scanning signal. 5. A display device having a plurality of pixels arranged in a matrix and displaying the image by scanning these pixels with a video signal, wherein an optical axis of the image on the display element is selected. And an image shift control unit that selectively shifts an image displayed on the display element in synchronization with the operation of the optical axis shift unit. For scanning timing,
A display device characterized in that it is configured to change an ON / OFF switching timing of the optical axis shift by the optical axis shift means. 6. A display element for displaying an image, and an optical axis shift means for selectively shifting the optical axis of the image on the display element to a first axis, a second axis and a third axis. Image shift control means for selectively shifting the image displayed on the display element from the first shift amount, the second shift amount and the third shift amount in synchronization with the operation of the optical axis shift means. And a display device configured to sequentially change a selection pattern of the first axis, the second axis, and the third axis by the optical axis shift means. 7. A display device having a plurality of pixels arranged in a matrix and displaying the image by scanning these pixels with a video signal, wherein an optical axis of the image on the display element is selected. And an image shift control unit that selectively shifts an image displayed on the display element in synchronization with the operation of the optical axis shift unit. The display is performed by the image signal. A display device characterized in that a sequential column of elements is horizontally scanned to display an image, and the optical axis shift means shifts the optical axis of the image during the display scanning. 8. A display device adapted to display a video signal from an image pickup device on a display device, and an image pickup optical axis shift means for selectively shifting an optical axis of incident light to the image pickup device, the display device. And a display optical axis shift means for selectively shifting the optical axis of the above image.