JP2005091519A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image of high quality by performing shifting of pixels by shifting an optical axis, timing of data update and that of the pixel shifting are made to match each other for each data updating method of a spatial optical modulation element to display an image of resolution higher than the resolution of a display element, and eliminating an image which causes image deterioration by using a light shielding means, in a liquid crystal display device. <P>SOLUTION: In the image display device which shifts pixels by shifting optical axes of light beams emitted by a plurality of pixels controlling light according to image information by updating the image data in a scanning line sequence as the spatial optical modulating element to enable display of an image of resolution higher than the resolution of the display element, timing of the data update of the spatial optical modulating element is made to match the timing of the pixel shifting and an image which causes deterioration resulting from the pixel shifting is shielded by the light shielding means which temporally moves the light from the light source in a data update direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an image display device, and more particularly to an image display device that prevents deterioration in image quality of high-definition image display by a method of increasing the number of pixels using a spatial light modulator.

Conventionally, an image display device using a CRT has been widely used as an image display device, but in recent years, an image display device using a liquid crystal display element or the like has come into general use.
In an image display device using a liquid crystal display element or the like, the definition of the image to be displayed is basically determined by the number of pixels constituting the liquid crystal display element, but the number of pixels is increased to obtain a high-definition image. If it does, the cost of a liquid crystal display element will become high, or a higher-speed signal processing circuit will be needed.
Therefore, a technique for displaying a higher-definition image using a liquid crystal display element having a limited number of pixels has been developed. As such a technique, one that shifts the optical axis of light from a display element using a birefringent plate is known. More specifically, for example, the optical axis of light emitted from a liquid crystal display element is time-sequentially. It is known that the number of observed pixels is increased by shifting the apparent pixel position sequentially by shifting (see, for example, Patent Document 1).
Furthermore, it is also known to divide one frame into four subfields and perform a four-point pixel shift technique for moving the apparent pixel position for each subfield, or to perform a multipoint pixel shift (for example, , See Patent Document 2).
Further, as a similar one, it is known that the performance such as contrast is deteriorated due to display during operation when performing pixel shifting (see, for example, Patent Document 3).
Further, in an image display device using a piezoelectric element as a pixel shifting element, the illumination light is turned off during the pixel shifting operation (see, for example, Patent Document 4), and an image is displayed on the display element during pixel shifting. There is also known a method for solving the problem by not performing the process (for example, see Patent Document 5).
As described above, a display element used in the image display apparatus as described above is generally one using an LCD of a type that emits light polarized in a horizontal direction or a vertical direction. There are two types of update of image data of the spatial light modulation element, which is a liquid crystal display element, that update the data of the entire screen all at once, and one that sequentially updates in the scanning line direction.
Japanese Patent Laid-Open No. 4-63332 JP 7-36054 A JP 2001-66625 A JP 2001-356411 A Japanese Patent Laid-Open No. 9-15548

However, when displaying a high-resolution image by pixel shifting, there are scenes where an image is displayed at a position other than the original position due to the relationship between the pixel shifting and the timing of image data update of the spatial light modulator (hereinafter referred to as LCOS). As a result, the image quality deteriorates, and the image quality obtained by shifting the pixels is not reached.
In an image display device using a piezoelectric element as a pixel shifting element, a method of turning off illumination during a shift operation has been proposed, but the illumination intensity of the illumination does not change digitally instantaneously, which causes image quality degradation. The image cannot be completely removed, and the originally desired image quality cannot be achieved.
Although a method of not displaying an image on the display element has been devised, since the display means also has a transient display at the time of switching the display, the noise image that causes the image quality deterioration cannot be completely removed and is originally required. There is also a problem that it is not possible to achieve the image quality.
The present invention has been made in consideration of the above-described circumstances, and performs pixel shifting by shifting the optical axis of light beams emitted from a plurality of pixels whose light can be controlled according to image information. In an image display device capable of displaying an image with a resolution higher than the resolution of the display element, the timing of data update and pixel shift is adjusted for each data update method of the spatial light modulation element, and image degradation is performed using a light shielding unit. An object of the present invention is to provide a high-quality image display by eliminating an image or the like that is causing pixel shift.

In order to solve the above-mentioned problem, the invention according to claim 1 is a spatial light modulator, wherein light beams emitted from a plurality of pixels that can sequentially update image data and control light according to image information. On the other hand, in an image display device that performs pixel shift by shifting the optical axis and enables image display with a resolution higher than the resolution of the display element, the timing of data update of the spatial light modulator and pixel shift The image display device is characterized in that an image causing image quality degradation caused by pixel shift and pixel shift timing is shielded by a light-shielding means that temporally moves light from the light source in the data update direction. .
The invention according to claim 2 uses, as the spatial light modulator, an element that updates image data sequentially by scanning lines, and for light rays emitted from a plurality of pixels that can control light according to image information, By shifting the optical axis, the pixel shift is performed, and in the image display apparatus capable of displaying an image with a resolution higher than the resolution of the display element, the pixel shift timing is matched with the data update timing of the spatial light modulator, The image display apparatus includes a light shielding unit that shields an image that causes image quality degradation caused by pixel shift and pixel shift timing by moving light from a light source in a data update direction in time.
The invention according to claim 3 uses, as the spatial light modulator, a device that sequentially updates image data in scanning lines, and for light rays emitted from a plurality of pixels that can control light according to image information. By shifting the optical axis, the pixel shift is performed, and in the image display apparatus capable of displaying an image with a resolution higher than the resolution of the display element, the pixel shift timing is matched with the data update timing of the spatial light modulator, Provided with a light-shielding means for shielding light by moving the light from the light source in the same direction as the data update, moving the image from the light source substantially parallel to the scanning line, and causing the image quality degradation caused by pixel shift and pixel shift timing Image display device.
According to a fourth aspect of the present invention, the light shielding unit is provided at a position where an image is formed between the pixel shifting unit and the image display projection lens.
According to a fifth aspect of the present invention, there is provided a microlens in an optical path from the polarization beam splitter after the image synthesis of the spatial light modulator, and a light blocking means at a position where an image is formed. The image display device according to any one of the above is characterized.

According to a sixth aspect of the invention, there is provided the image display device according to any one of the first to third aspects, wherein the time for updating the image data and the moving time of the light shielding means are the same.
The invention according to claim 7 is the image display device according to claim 6, wherein T ≦ T1 + T2 when the time T from the start to the end of light shielding is T1 as the data update time and the pixel shift time is T2. And
According to an eighth aspect of the present invention, in the second or third aspect, when the data update period is longer than the transient phenomenon period associated with the data update, the light shielding movement time is set earlier than the data update time, and the pixel is updated during the data update period. The image display apparatus includes a shift period.
The invention according to claim 9 is characterized in that, in claim 8, pixel shifting is performed with the middle of the time from the start of data update to the end of the transient phenomenon period accompanying data update as the intermediate timing of the pixel shift period. The image display apparatus which performs the light shielding mentioned above is characterized.
According to a tenth aspect of the present invention, there is provided a light shielding plate in which the light shielding means has two or more shafts as fulcrums, and the shafts that rotate around the fulcrums at equal distances from the fulcrums are connected to each other. 6. The light shielding plate according to claim 1, wherein the light shielding plate sequentially shields light in parallel with a scanning line having two or more surfaces parallel to a line connecting fulcrums.
The invention described in claim 11 uses a spatial light modulation element that updates image data all at once, and for light rays emitted from a plurality of pixels that can control light according to image information. By shifting the optical axis, the pixel shift is performed, and in the image display device capable of displaying an image with a resolution higher than the resolution of the display element, the data update timing of the spatial light modulator and the pixel shift timing are matched. The image display device is characterized in that the timing of shading is matched with the timing of pixel shift, and the entire screen is shielded simultaneously using the light shielding means.

The invention according to claim 12 uses a spatial light modulation element that updates image data all over the screen, and with respect to light rays emitted from a plurality of pixels that can control light according to image information. In an image display device having a light shielding means capable of performing pixel shift by shifting the optical axis and displaying an image with a resolution higher than the resolution of the display element, the timing of data update of the spatial light modulator and the pixel It features an image display device that matches the timing of shifting, matches the timing of blocking light to the timing of shifting pixels, condenses the light from the light source, and blocks the light all together using a light blocking means at the focused position. To do.
Further, in the invention described in claim 13, in claims 11 and 12, the time from the start to the end of shading is T, the start time of data update is T3, the end time is T4, the start time of pixel shift is T5, When the end time is T6, when T4-T3 ≧ T6-T5, T3 ≦ T5, T4 ≧ T6, T≈T6-T5, and when T4-T3 ≦ T6-T5, T3 ≧ T5, T4 ≦ T5, T It is characterized by an image display device with ≈T6-T5.
Further, in the invention described in claim 14, when the light shielding means is installed at the position of the illumination system preceding the polarizing beam splitter, the light coming direction of the light shielding plate is mirrored or mirror processed, and the light at the time of light shielding is The image display apparatus includes a light shielding unit that reflects toward the illumination side.
In order to solve such a problem, in the present invention, in accordance with the LCOS data update method, by providing a light shielding means, the light from the light source during the period in which the image quality is deteriorated by the display is shielded, and the control is performed. By controlling the timing of data updating, pixel shifting, and shading, the factors that deteriorate the image quality are eliminated while minimizing the non-display time, and high-quality and high-resolution image display is realized.

According to the present invention, in claim 1, an LCOS that updates image data sequentially in a scanning line is used, and the optical axis of light emitted from a plurality of pixels that can control light according to image information. In an image display apparatus that can display an image with a resolution higher than that of the display element by shifting the pixel, the pixel shift and the pixel shift are performed in accordance with the LCOS data update timing and the pixel shift timing. By blocking light from the light source by the light blocking means that moves the light from the light source in time in the data update direction, the image can be blocked in accordance with the data update direction. It becomes possible to eliminate the causal image and display a high-quality, high-resolution image.
According to a second aspect of the present invention, an LCOS that updates image data sequentially in scanning lines is used, and the optical axis is shifted with respect to light rays emitted from a plurality of pixels that can control light according to image information. In the image display device that can perform pixel shifting by the above and display an image with a resolution higher than the resolution of the display element, the pixel shifting timing is matched with the LCOS data updating timing, and the light from the light source is timed in the data updating direction. By moving the light and moving the light, the light can be shaded according to the data update direction by pixel shifting, eliminating the image display causing image quality degradation caused by the pixel shifting and the pixel shifting timing, and also needing the light blocking. By shortening the period, the light utilization efficiency can be increased and high quality and high resolution images can be displayed. So as to.
Further, according to the third aspect of the present invention, an LCOS that updates image data sequentially in a scanning line is used, and the optical axis is shifted with respect to light rays emitted from a plurality of pixels that can control light according to image information. In the image display device that can perform pixel shifting and display an image with a resolution higher than that of the display element, the pixel shifting timing is matched with the LCOS data updating timing, and the light from the light source is the same as the data updating. By moving the light shielding part in the direction approximately parallel to the scanning line and shielding the light, it is possible to update the data by pixel shifting and light shielding according to the updating direction, and image quality degradation caused by the timing of pixel shifting and pixel shifting In addition to eliminating images that cause light, it is possible to increase the light use efficiency by shortening the period that requires light shielding. Image it is possible to view the.

Further, according to the fourth aspect of the present invention, since the light shielding means is provided at the position where the image between the pixel shift element and the projection lens forms an image, no new parts other than the light shielding means are required in order to perform light shielding. Thus, light shielding by the light shielding means can be realized.
According to a fifth aspect of the present invention, a microlens is provided after the polarization beam splitter (PBS), and a light shielding unit is provided at a position where an image is formed, so that light use efficiency is high and an image at an image position to be shielded can be shielded.
According to the sixth aspect of the present invention, since the data update speed and the light shielding movement speed are the same, the light shielding can be performed in accordance with the update of the uniform data on the entire screen, and a uniform high quality light resolution image is displayed on the entire screen. be able to.
According to the seventh aspect of the present invention, when T is the data update time T1 and the pixel shift time is T2 from the start to the end of the light shielding, and T ≦ T1 + T2, the unnecessary image display is eliminated and the light use efficiency is reduced. It is possible to display a high-quality, high-resolution image that suppresses the decrease in image quality.
According to the eighth aspect of the present invention, when the data update period is longer than the transient phenomenon period accompanying the data update, the shading movement time is set earlier than the data update time, and the pixel shift period is included in the data update period, thereby eliminating unnecessary image display. At the same time, it is possible to reduce a decrease in light utilization efficiency.
According to claim 9, the data update start time is 0, when the transient period end time associated with the data update and T _7, when the intermediate pixel shifting period and T _8, the pixels at the timing T ₈ ≒ T _7/2 By performing the shifting, the light use efficiency can be maximized while eliminating unnecessary image display.
In claim 10, there is provided a light shielding plate having two or more shafts each as a fulcrum, and connecting the shafts that rotate at an equal distance from the fulcrum around each fulcrum, and the light shielding plate connects the fulcrums. By having two or more planes parallel to the ellipse, light can be shielded sequentially in parallel with the scanning line, and the left and right sides of the screen can be shielded under the same conditions by using the circular motion of the fulcrum shaft.
According to the eleventh aspect of the present invention, a spatial light modulation element that updates image data all at once is used, and the optical axis is shifted with respect to light rays emitted from a plurality of pixels that can control light according to image information. In the image display device that can perform pixel shifting and display an image with a resolution higher than that of the display element, the data update timing of the spatial light modulator and the pixel shifting timing are matched to the pixel shifting timing. By aligning the timing of light shielding and shielding the entire screen all at once using the light shielding means, it is possible to eliminate the display of images other than the correct position and data due to the relationship between pixel shift and data update, and display high quality images. become able to.

According to the twelfth aspect of the present invention, a spatial light modulation element that updates image data all at once is used, and the optical axis is shifted with respect to light rays emitted from a plurality of pixels that can control light according to image information. In the image display device provided with the light shielding means capable of performing pixel shifting and displaying an image with a resolution higher than the resolution of the display element, the timing of data update of the spatial light modulator and the timing of pixel shifting are matched, The timing of shading is matched with the timing of pixel shifting, the light from the light source is condensed, and the light is simultaneously shielded by using the light shielding means at the condensed location, thereby eliminating unnecessary image display and light. It is possible to display a high-quality image that suppresses a decrease in the use efficiency of.
According to the thirteenth aspect, the time from the start to the end of the shading is T, the start time of the data update is T, the time from the start to the end of the shading, the start time of the data update is T3, the end time is T4, and the pixel shift start When the time is T5 and the end time is T6, when T4-T3 ≧ T6-T5, T3 ≦ T5, T4 ≧ T6, T≈T6-T5, and when T4-T3 ≦ T6-T5, T3 ≧ T5, T4 By setting .ltoreq.T5 and T.apprxeq.T6-T5, it is possible to display a high-quality image while suppressing a decrease in light utilization efficiency.
According to the fourteenth aspect, by reflecting the light at the time of shielding to the illumination side, the shielded light can be reused and the light utilization efficiency can be enhanced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The present invention is an image display device including a pixel shifting element that divides one frame into a plurality of subfields, LCOS, a light shielding means for shielding light from a light source, and a means for controlling them.

In this embodiment, an LCOS that updates image data in order of scanning lines is used, one pixel is shifted and four pixels are displayed using two elements, and light can be controlled according to image information. In addition to increasing the resolution by shifting the optical axis of the light beam emitted from the pixel, the pixel shift and the pixel shift are performed in accordance with the LCOS data update timing and the pixel shift timing. 2 is an example of an image display device including a light shielding unit that shields an image that causes image quality degradation caused by the timing of light by moving light from a light source in a data update direction over time.
FIG. 1 is an example of a timing chart showing the relationship between display image data, pixel positions, and light shielding in this embodiment. The image display data is updated in the direction from the top to the bottom of the screen, and the updated data is in the order of D1, D2, D3, D4, D1 ′. There is a transition period due to the characteristics of LCOS at the time of update. The position of the image display element is sequentially displaced to the positions P1, P2, P3, and P4 within one field period, and four subfields are formed at each position.
When shifting the position of this pixel, for example, there is a moving period in which the pixel is shifted to a position that is neither P1 nor P2 during the shift from P1 to P2. As described above, the data is updated sequentially from the top to the bottom of the screen. However, because the pixel shift is performed all at once, the image data is displayed at a position other than the intended position due to the pixel shift and the timing of the image data update. It happens. Therefore, in this example, in order to eliminate such an image, in order to uniformly exclude the data update and the period in which the pixel position is not displayed at the original position on the entire screen, the movement time almost the same as that of the data update in that period. The light is shielded. As a result, only data at the correct position is displayed, and high-quality and high-resolution image display can be realized.

In this embodiment, image data is sequentially updated on the LCOS by using scanning lines, and one pixel is increased in resolution by using a pixel shift element, and the pixel shift timing is adjusted to the LCOS data update timing. In addition, it is an example of a plotter provided with a light shielding means for shielding light by moving light from the light source in the same direction as the data update direction.
FIG. 2 is an example of a timing chart showing the relationship between display image data, pixel positions, and light shielding in this embodiment. The image display data is updated in the direction from the top to the bottom of the screen, and the updated data is in the order of D1, D2, D3, D4, D1 ′. There is a transition period due to the characteristics of LCOS at the time of update. The position of the image display element is sequentially displaced to the positions P1, P2, P3, and P4 within one field period, and four subfields are formed at each position. When shifting the position of this pixel, for example, there is a moving period in which the pixel is shifted to a position that is neither P1 nor P2 during the shift from P1 to P2. As described above, the data is sequentially updated from the top to the bottom of the screen. However, since pixel shifting is performed all at once on the screen, the image data may be displayed at a position other than the intended position.
Therefore, in this example, in order to eliminate such an image, the period in which the data update and the pixel position are not displayed at the original position is uniformly excluded on the entire screen, and the pixel shift period timing is changed to the data update period timing. Therefore, the light shielding period for exclusion is shortened, and the light is shielded with substantially the same movement time as that period data update. As a result, only the data at the correct position is displayed, and the light use efficiency can be increased by shortening the period requiring light shielding, and a high-quality image can be displayed.
FIG. 3 is an example of the structure of the light shielding means using a rotating disk. The rotating disk 1 has a fan-shaped light-shielding plate 5 that is rotated by a motor 2 and performs light-shielding with this light-shielding plate. The ratio of the angle between the light shielding part and the non-light shielding part is the ratio between the light shielding time and the non-light shielding time.
FIG. 4 is an example of a timing chart when a rotating disk is used as the light shielding means. Since a rotating disk is used, a simple mechanism with slightly different light-shielding timing and period inside and outside the disk in the horizontal direction of the screen, and using LCOS that sequentially updates image data as scanning lines In addition, only data at the correct position is displayed, and a high-resolution image display with high image quality can be realized.

In the present embodiment, when LCOS is used to update image data sequentially in a scanning line and one pixel is shifted to a high resolution by using an element, the light from the light source is directed in the same direction as the data update direction. It is an example of the plotter provided with the light-shielding means which moves parallel to a scanning line and shields light.
FIG. 5 is an example of the timing chart, in which the data update time and the light shielding movement time are substantially the same. Since the light shielding can be performed by moving in parallel with the scanning line, uniform light shielding can be performed on the left and right sides of the screen, and it is possible to realize a high resolution image display with a short shading time and a uniform high image quality over the entire screen.
FIG. 6 shows an example of the structure of the light shielding means. A shaft driven by the motor 2 and a fixed shaft are used as fulcrums 3, respectively, and a light shielding plate 5 having the same distance from the fulcrum on a disk rotating at each fulcrum and connecting the shafts to each other is provided. The light shielding plate 5 has a surface parallel to a line connecting the fulcrums. When the motor is driven, the disk 6 shown below rotates. The shaft 4 on the disk performs a circular motion, but is connected to the disk-shaped shaft 4 centered on the fixed fulcrum 3 and the light-shielding plate 5, so that the fixed disk 6 is also on the motor side. Do the same exercise as Since the shading plate connecting the shafts has a plane parallel to the line connecting the fulcrums, it always moves in parallel with the line connecting the fulcrums during driving. The light shielding plate moves in a circular shape, and the light path 7 of the light to be shielded moves in a direction perpendicular to the line connecting the fulcrums. Therefore, when the light path in the parallel direction is shielded, the light shielding plate is completely blocked by the light shielding plate. When it is not shielded, it will not be shielded.
The position control of the light shielding plate can be realized by determining the rotation start position of the light shielding plate such as providing a home position in the motor, or providing a mechanism such as a sensor for detecting the position of the light shielding plate.

7 and 8 are examples of timing charts showing the relationship between the data update time and the light shielding movement time from the data update period T1 and the transient phenomenon period T2 accompanying data update. As shown in FIG. 7, when the data update period T1 is equal to or shorter than the transient phenomenon period T2 associated with data update, if the data update time and the light-shielding movement time are made equal, only the data at the correct position can be displayed on the entire screen under uniform conditions. High-resolution image display can be realized.
In addition, as shown in FIG. 8, when the data update period T1 is longer than the transient phenomenon period T2 associated with data update, the light shielding movement time is set earlier than the data update time, the pixel shift period is included in the data update period, and the data update start time If the pixel shift period is in the middle of the transient phenomenon period end time associated with the data update, the light shielding period is shortened. That is, it is possible to display only the data at the correct position on the entire screen under uniform conditions while suppressing the decrease in light utilization efficiency due to light shielding, and to realize high-quality and high-resolution image display.
9 and 10 show an example of the structure of a three-plate type plotter provided with this light shielding means. In FIG. 9, a lamp 9, a filter 10, an integrator 11, and a deflecting plate 8 are disposed, and three LCOSs L, PBS P, and a pixel shifting element 12 are provided. And the projection lens 13. In this method, no additional components are required in addition to the light shielding means for performing light shielding, and the light shielding by the light shielding means 5 can be easily realized.
Further, in FIG. 10, although the number of components is increased by providing the microlens 14, it is possible to realize light blocking with a higher light utilization efficiency than the previous method. In both structures, by providing a light shielding means where an image is formed, light shielding that moves in the data update direction can be performed in accordance with the image.

The present embodiment is an example of a plotter provided with light shielding means for simultaneously updating image data in the LCOS all over the screen and simultaneously shielding light for the entire screen. 11 and 12 are structural diagrams of a three-plate type plotter using a rotating disk 17 as a light shielding means. Here, the rotating disk is used as the light shielding means, but there are other means such as a liquid crystal shutter, an optical shutter, and a mechanical shutter. In FIG. 11, a condenser lens 15 and a convex lens 16 for returning light perpendicular to the integrator are placed in the front stage of the integrator 11, and a rotating disk 17 serving as a light shielding means is installed at a point where the light is condensed therebetween.
In FIG. 12, a spheroid mirror 18 is used as a lamp mirror, and a rotating disk 17 serving as a light shielding means is installed at a point where light is collected thereby, and a convex lens for returning light perpendicular to the integrator is provided at the subsequent stage. It is arranged. FIG. 11 has an advantage that the focal point can be reduced, and FIG. 12 has an advantage that the number of parts can be reduced.
13 and 14 use LCOS that updates image data all over the screen at the same time, and shifts pixels by shifting the optical axis of light emitted from a plurality of pixels that can control light according to image information. 4 is a timing chart in a case where the light from the light source is emitted all over the screen in accordance with data update and pixel shift in an image display apparatus capable of displaying an image with a resolution higher than that of the display element.
As a simultaneous light shielding method, the light from the light source is condensed at one point and physically shielded, or the light on the optical path such as a liquid crystal shutter, an optical shutter, etc. is shielded without much condensing or the optical path is changed. There is a way. At this time, if the direction of the light coming from the light shielding plate is mirrored or mirrored as a light shielding plate, and the light at the time of light shielding is reflected to the illumination side, the light that has been shielded will have an optical path symmetrical about the optical axis on the mirror side of the light source. The light is reflected back and reused by the mirror of the light source, so that the light use efficiency is improved.
13 and 14, if the time from the start to the end of shading is T, the data update start time is T3, the end time is T4, the pixel shift start time is T5, and the end time is T6, FIG. In the case of ≧ T6-T5, FIG. 14 shows the case of T4-T3 ≦ T6-T5. Since both the data update and shading are performed at the same time on the entire screen, the images in the transition period accompanying the data update are displayed on the entire screen under uniform conditions. In the case of FIG. 13, the pixel shift movement period is set within the data update transition period, and the movement period affecting the image is shielded from light. At this time, it is necessary to set the timing of the movement period so that the image display position does not change even during the transition period.
In the case of FIG. 14, the transition period of data update is set within the movement period shifted by pixels, and the movement period that affects the image is shielded from light. 13 and 14, when the image data is updated to the LCOS all at once, the correct position is obtained after suppressing the decrease in light use efficiency by shielding all the screens at the same time. It is possible to realize high-quality and high-resolution image display in which only data is displayed.

It is explanatory drawing which shows the timing of the image data update of this invention, pixel shift, and the light-shielding means. It is explanatory drawing which shows the other example of the timing of the update of this invention, shifting, and light-shielding. It is a schematic structure figure of the rotation disk used for the light-shielding means of this invention. It is a timing chart in case the light-shielding means of this invention is a rotating disk. It is a timing chart in case the light-shielding means of this invention moves parallel to a scanning line. It is the plane and sectional structure figure of the light-shielding means which has the disk and light-shielding plate which perform the rotational movement of this invention. It is a timing chart in case the light-shielding means of this invention includes the pixel shift period in the data update period. 5 is a timing chart when the light shielding means of the present invention is when data update is longer than a transient phenomenon period accompanying data update. FIG. 4 is a structural diagram of a plotter provided with a light shielding means between a pixel shifting element and a projection lens according to the present invention. FIG. 3 is a structural diagram of a plotter provided with a microlens after the PBS of the present invention and provided with a light shielding means at an image formation position. FIG. 3 is a structural diagram of a plotter in which a convex lens is provided in the front stage of the fly-eye lens of the present invention and a light shielding unit is provided at a light collecting position. FIG. 4 is a structural diagram of a plotter using a spheroid mirror according to the present invention and having a light blocking means at a light condensing place. FIG. 4 is a timing chart in which data is updated all at once and light from a light source is blocked all at once after pixel shifting. 6 is another timing chart in which data is updated all at once in the present invention and light from a light source is blocked all at once after pixel shifting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating disk 2 Motor 3 Support point 4 Axis 5 Shading plate 6 Disk 7 Optical path 8 Polarizing plate 9 Lamp 10 Filter 11 Integrator 12 Image shift element 13 Projection lens 14 Micro lens 15 Condensing lens 16 Convex lens 17 Shading means 18 Rotating ellipsoidal mirror

Claims (14)

  As a spatial light modulation element, image data is updated by scanning line sequentially, and pixel shift is performed by shifting the optical axis of the light emitted from a plurality of pixels whose light can be controlled according to the image information. And a pixel shift timing in accordance with the data update timing of the spatial light modulation element and the pixel shift timing in the image display device comprising the means, and capable of displaying an image with a resolution higher than that of the display element. An image display apparatus characterized in that an image causing image quality degradation caused by the light is shielded by a light shielding means that temporally moves light from a light source in a data update direction.   A spatial light modulation element that updates image data sequentially in a scanning line is used, and pixel shifting is performed by shifting the optical axis of light emitted from a plurality of pixels that can control light according to image information. In an image display device comprising an image shifting means for performing image display capable of displaying an image with a resolution higher than the resolution of the display element, the pixel shift timing is matched with the data update timing of the spatial light modulation element, and pixel shift and pixel shift are performed. An image display device comprising: a light-shielding unit that shields an image that causes image quality degradation caused by the timing of light by moving light from a light source temporally in a data update direction.   A spatial light modulation element that updates image data sequentially in a scanning line is used, and pixel shifting is performed by shifting the optical axis of light emitted from a plurality of pixels that can control light according to image information. In an image display device comprising an image shifting means for performing image display capable of displaying an image with a resolution higher than the resolution of the display element, the pixel shift timing is matched with the data update timing of the spatial light modulation element, and pixel shift and pixel shift are performed. A light-shielding means for shielding light by moving light from the light source in the same direction as the data update and moving the light-shielding portion substantially parallel to the scanning line in the same direction as the data update. Image display device.   4. The image display device according to claim 1, wherein the light shielding unit is provided at a position where an image is formed between the pixel shifting unit and the image display projection lens. 5.   4. The micro-lens is provided in an optical path from the polarization beam splitter after the image synthesis of the spatial light modulator, and the light shielding unit is provided at a position where an image is formed. 5. The image display device described in 1.   The image display device according to claim 1, wherein the image data update time is the same as the moving time of the light shielding unit.   7. The image display device according to claim 6, wherein T ≦ T1 + T2 is satisfied, where T is a data update time T1 and T2 is a pixel shift time from the start to the end of light shielding.   4. The image display according to claim 2, wherein when the data update period is longer than a transient phenomenon period accompanying data update, the light shielding moving time is made earlier than the data update time, and a pixel shift period is included in the data update period. apparatus.   9. The image according to claim 8, wherein light shielding is performed, wherein pixel shifting is performed with an intermediate timing from the start of data updating to the end of a transient phenomenon period accompanying data updating as an intermediate timing of the pixel shifting period. Display device.   The light shielding means includes a light shielding plate having two or more shafts as fulcrums, and shafts that rotate around the fulcrum at equal distances from the fulcrum, and the light shielding plates connect the fulcrums. 6. The image display device according to claim 1, wherein the image display device sequentially shields light in parallel with a scanning line having two or more surfaces parallel to the ellipse.   A spatial light modulation element that updates image data at the same time on the entire screen is used, and pixel shifting is performed by shifting the optical axis of light emitted from a plurality of pixels that can control light according to image information. In the image display device capable of displaying an image with a resolution higher than the resolution of the display element, the timing of updating the data of the spatial light modulation element and the timing of pixel shift are combined, and the timing for shielding light from the pixel shift timing is set. In addition, the image display device is characterized in that the entire screen is shielded simultaneously by using a light shielding means.   A spatial light modulation element that updates image data at the same time on the entire screen is used, and pixel shifting is performed by shifting the optical axis of light emitted from a plurality of pixels that can control light according to image information. In the image display device having the light shielding means capable of displaying an image with a resolution higher than the resolution of the display element, the timing of the pixel update is matched with the timing of the data update of the spatial light modulator and the timing of the pixel shift. An image display device characterized in that the light shielding timing is matched, the light from the light source is condensed, and the light is simultaneously shielded by using a light shielding means at the condensed position.   13. T4-T3 when the time from the start to the end of shading is T, the start time of data update is T3, the end time is T4, the start time of pixel shift is T5, and the end time is T6. When T ≧ T6-T5, T3 ≦ T5, T4 ≧ T6, T≈T6-T5, and when T4-T3 ≦ T6-T5, T3 ≧ T5, T4 ≦ T5, and T≈T6-T5. Image display device. When the light shielding means is installed at the position of the illumination system upstream of the polarizing beam splitter, the light coming from the light shielding plate is mirrored or mirror processed, and the light at the time of light shielding is reflected to the illumination side An image display device comprising means.

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