JP2008310260A - Image projection method and screen used for the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress influences of disturbance light when an image is displayed by scanning a screen with projected image light. <P>SOLUTION: In an image projection method comprising displaying an image by scanning a screen 300 with projected image light 201, the image is displayed by controlling the reflectance of a region 312 where the screen 300 is scanned with the image light 201 to be higher compared with the reflectance of regions 301 to 311 and 313 to 316 where the screen is not scanned with the image light. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image projection method for scanning and projecting image light corresponding to image information from a projection device toward a screen and displaying an image, and a screen used for the image projection method.

  As a screen used in a conventional forward projection type image projection apparatus, a screen in which a white paint or a material having high reflectance is sprayed on a cloth fabric is generally used. Since such a screen reflects not only the projection light but also disturbance light, it is necessary to improve the installation environment such as keeping the room dark and keeping the reflectance of walls, ceilings, floors, furniture, etc. low.

  For example, several active type so-called active screens have been proposed as special screens that can project without reducing contrast in a bright environment (see, for example, Patent Documents 1 to 3).

  The screen disclosed in Patent Literature 1 receives a focused image for each pixel and generates a photovoltaic power corresponding to the received light amount, and a photovoltaic power supplied from these photovoltaic cells for each pixel. The liquid crystal cell has a variable transmittance.

The screen disclosed in Patent Document 2 includes a light receiving element that receives an imaged image for each pixel, and a light emitting element that is controlled to be turned on in proportion to a photoelectric output from the light receiving element.
The screen disclosed in Patent Document 3 includes a photoconductive layer that generates a resistance distribution corresponding to the light intensity distribution, and a liquid crystal layer having a memory function to which a voltage is applied corresponding to the resistance distribution of the photoconductive layer. To do.

JP-A-1-105923 Japanese Patent Laid-Open No. 1-105989 Japanese Patent Laid-Open No. 1-116628

The screens disclosed in Patent Documents 1 to 3 control the light emission intensity of the light emitting element and the transmittance of the liquid crystal with gradation corresponding to the image light, have a complicated structure, and constitute pixels with uniform characteristics. May be difficult. Furthermore, it cannot be used as it is for a so-called projector that projects directional light from the front of the screen to display a clear image.
Furthermore, the current screens including the screens described in Patent Documents 1 and 2 have a problem that the influence on ambient light cannot be suppressed.

  In order to solve the above-described problem, an object of the present invention is to suppress the influence of disturbance light when scanning and projecting image light on a screen to display an image.

  The image display method of the present invention is characterized in that the reflectance of the area where the image light of the screen is scanned is controlled to be higher than the reflectance of the area where the image light is not scanned.

  Further, the screen of the present invention has a surface that reflects image light scanned and projected from the front in the light incident direction, and the surface can be controlled to reflectivity in two stages of high reflectance and low reflectance. It is characterized by being made.

  According to the present invention, the reflectance of the area scanned and projected on the screen is controlled to be higher than the reflectance of other areas. As described above, when the image light is reflected in the region having a high reflectance, the projected image is displayed favorably. On the other hand, by controlling the reflectivity other than the area where scanning is projected, disturbance light in the low reflectivity area is suppressed from being reflected and hardly visible, and the influence on the display characteristics can be effectively suppressed. .

  The screen of the present invention can be controlled to have a high reflectance and a low reflectance region. The projected image can be displayed on the screen satisfactorily by scanning and projecting image light onto the high reflectance region. Further, in the low reflectance region on the screen surface, the reflection of disturbance light can be suppressed. Thereby, the influence of disturbance light can be suppressed effectively.

  According to the image projection method and the screen of the present invention, reflection by disturbance light can be suppressed, and image light can be scanned and projected on the screen to display an image.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an example of an image projection apparatus according to an embodiment of the image projection method of the present invention.

In FIG. 1, the one-dimensional image light 201 irradiated from the image projection apparatus 200 of the front projection type is scanned on the screen 300 from right to left or from left to right, so that it is two-dimensionally displayed on the screen 300. A state of projecting an image is shown.
The surface on which the image of the screen 300 is projected is divided into, for example, a region divided into 16 vertically. Each of the divided areas is configured by reflectance control bands 301 to 316 capable of controlling the reflectance of light for each area. Further, a non-display area 340 in which a projected image is not displayed is provided around the reflectance control bands 301 to 316.

  The image projection device 200 scans the surface of the screen 300 with the one-dimensional image light 201 and sequentially projects images. At this time, at least the area on which the one-dimensional image light 201 is projected on the screen 300, in the illustrated example, the reflectance of the reflectance control band 312 is that of the other reflectance control bands 301 to 311 and 313 to 316. It is high compared to the reflectance, desirably close to 100%, and is controlled so as to reflect almost all light in the visible range. The time for controlling the reflectance in this way is at least the time during which the image light 201 is projected onto the reflectance control zone 312. During this time, the areas other than the reflectance control band 312, that is, the reflectance control bands 301 to 311 and 313 to 316 have a low reflectance, and preferably the reflectance is almost zero for visible light. Closely controlled.

Such a reflectance control zone can be configured such that a high contrast color such as white and black can be switched. Then, by synchronizing this black and white switching with the projection area of the image light, the reflectance control band of the portion where the image light is projected is controlled so as to be displayed as white with a high reflectance, for example. Control is performed so that the reflectance control band is, for example, black with a low reflectance.
As described above, in the image projection method according to the present embodiment, the scanning timing of the image light to be scanned and projected and the control timing of the reflectance of the reflectance control bands 301 to 316 are synchronized, and the two-dimensional image is screened. Project to the top.

  On the screen 300, the area where the one-dimensional image light is not projected only reflects disturbance light, and is not involved in the display of the projected image. For this reason, by reducing the reflectance of only the region where the one-dimensional image light is not projected, the area where the disturbance light is reflected can be remarkably reduced without affecting the image display. On the other hand, at each position on the screen, the period during which the reflectance is lowered becomes much longer than the period during which the image light is scanned to increase the reflectance. That is, the disturbance light reflected by the screen can be suppressed sufficiently small in terms of area and time. By suppressing the reflection of disturbance light in this way, reflection on the screen due to light other than the projection image from the image projection apparatus 200 can be suppressed even in a bright room. For this reason, even when projection is performed in a bright room, it is possible to suppress a decrease in contrast of the entire screen.

  FIG. 1 shows a case where the screen is divided into a plurality of parts in the vertical direction and one-dimensional image light is scanned in the horizontal direction. However, the screen division method, the number of divisions, and the image light scanning method are not particularly limited. For example, it is possible to divide the screen into matrix-like reflectance control bands and sequentially scan the respective reflectance control bands with image light having a shape corresponding to this region. Even in this case, the reflection of disturbance light on the screen surface is suppressed by applying the present invention in which the reflectance of the region projecting the image light is controlled to be high and the reflectance of the other regions is controlled to be low. And a decrease in contrast of the entire screen can be suppressed.

Next, an example of an image projection apparatus used in the image display method according to the embodiment of the present invention described above will be described with reference to FIG.
FIG. 2 is a schematic perspective configuration diagram of the image projection apparatus, and schematically shows a state in which a two-dimensional image is displayed by scanning and projecting a one-dimensional image on the screen 300 using, for example, a diffraction grating type light modulation device. It is a thing. In FIG. 2, parts corresponding to those in FIG.

  As the light modulation device, for example, a light modulation element such as a phase reflection type diffraction grating represented by a GLV (Grating Light Valve) element manufactured by Silicon Light Machine Co., USA can be used. In a one-dimensional light modulation device using such a phase reflection diffraction grating, diffraction grating light modulation elements corresponding to a plurality of pixels are arranged in a line. Then, image information is obtained by irradiating a one-dimensional (line-shaped) coherent light along the major axis (longitudinal) direction, which is the arrangement direction, and deforming the diffraction grating by electrostatic driving or the like corresponding to the image information. Is modulated into a one-dimensional image light and emitted.

As described above, when a one-dimensional light modulation device is configured using a light modulation element such as GLV, a light source is necessary because it is non-self-luminous, and a coherent light source such as a semiconductor laser is necessary. It is. In the case of projecting a color image, it is desirable to provide each color light source such as red, blue and green and a corresponding one-dimensional light modulator.
Note that when a self-luminous element in which light-emitting diodes and the like are arranged one-dimensionally is used as the one-dimensional light modulator, a light source is not necessary.

  In FIG. 2, the light emitted from the light source 100 is shaped into a light beam having a predetermined shape by the illumination optical system 101 and irradiated to the light modulation device 102. Although not shown, when the light source includes light sources of, for example, three primary colors of red, green, and blue, an illumination optical system and a light modulation device are arranged corresponding to each light color light, and color synthesis such as an L-shaped prism is performed. One image light is generated by the unit. The light modulation device 102 modulates the reflection angle and the like of incident light based on a signal S from the signal processing unit 110 (for example, a signal for each color when three colors of light are modulated). Thus, the light modulated by the light modulation device 102 in accordance with information such as an image is incident on a projection optical unit 120 including a light selection unit 105 such as an Offner optical system, a projection lens 106, and the like. A one-dimensional image 46 is formed at a position before incidence of the projection lens 106. It is good also as a structure which arrange | positions a light-scattering element so-called diffuser here, and suppresses a speckle.

Then, the light emitted from the projection lens 106 is scanned and projected so that the one-dimensional image light is indicated by arrows L1, L2,. Then, a one-dimensional image is sequentially displayed in the direction indicated by the arrow S on the surface of the screen 300, and a two-dimensional image is generated in the image display area 47.
Here, as described in FIG. 1, the screen 300 is divided into a plurality of reflectance control bands.

The scanning projection of the one-dimensional image light by the scanning optical unit 107 is performed by a predetermined scanning operation. In the illustrated example, the phase timing signal St of this scanning operation is transmitted from the signal processing unit 110 to the control device 109 provided on the screen 300.
The screen 300 controls the reflectance control zone in accordance with the scanning of the image light and the phase timing signal St. This synchronizes the scanning timing of the projected one-dimensional image light and the control timing of the reflectance control zone of the screen.
The transmission of the above-described phase timing signal St is performed by, for example, a signal cable, infrared communication, wireless communication, or the like.

As shown in FIG. 2, there are non-display areas 48a and 48b on both sides of an image display area 47 (shown with diagonal lines) on which a two-dimensional image on the screen 300 is projected.
Here, for example, when the image signal is 120 frames / second, there occurs a time during which light is scanned and projected into the non-display areas 48a and 48b for about 2 milliseconds.

Such a non-display area can be actively used to synchronize the scanning of the image light and the control of the reflectance control zone. The image projection method in this case will be described with reference to FIG. In FIG. 3, parts corresponding to those in FIG.
As shown in FIG. 3, in this case, on the surface of the screen 300, a non-display area 340 that does not display a two-dimensional image projected from the image projection apparatus 200 is provided, for example, around the outside of the display area.
A light receiving portion 341 is provided in a part of the non-display area 340, in the illustrated example, in the upper portion on the negative side. The light receiving unit 341 is preferably made of a material having light absorption and low reflectivity, for example. If the reflectance is low, reflection due to ambient light or the like can be suppressed. The image projection apparatus 200 projects signal light 342 having information for controlling the reflectance control bands 301 to 316 on the screen 300 toward the light receiving unit 341 in addition to normal scanning of image light. To do. By receiving the signal light 342, the control timing of the reflectance control band in the screen 300 can be adjusted, and synchronization with the scanning timing of the image projection apparatus 200 can be performed.

  In FIG. 3, one light receiving unit 341 is provided in the non-display area 340. For example, in the non-display area 340, the reflectance control bands 301 to 315 are arranged below or above the reflectance control bands 301 to 316. It is good also as a structure which provides the light-receiving part corresponding to each for 316 each. In this case, the range for projecting light from the image projection apparatus 200 is expanded upward or downward from the image display area, and information for controlling the reflectance control band is provided above or below the image display area on the screen 300. The added signal light is projected. Each of the reflectance control bands 301 to 316 can be controlled by receiving information at the light receiving unit provided in each of the reflectance control bands 301 to 316.

  The light receiving part 341 may be formed anywhere as long as it is the non-display area 340. For example, it can be formed in the non-display areas 48a and / or 48b shown in FIG. And the image light which added the signal beam | light which has the information for controlling the reflectance control bands 301-316 is projected on the light-receiving part provided in the non-display area | region 48a and / or 48b. In this case, since it is not necessary to expand the area for projecting image light by providing a light receiving section in a non-display area that normally occurs, design changes in the optical system, scanning section, and the like of the image projection apparatus 200 become unnecessary. .

  Next, the configuration of the screen according to the embodiment of the present invention for controlling the reflectance as described above will be described. The reflectance control zone of the screen can be configured using techniques such as electronic paper and a reflective liquid crystal display, for example, and the reflectance can be controlled easily and accurately.

First, an embodiment of an electronic paper type screen is shown in the schematic cross-sectional configuration diagram of FIG.
In the screen 300 shown in FIG. 4, a back electrode 351 is formed on a flexible substrate 352 such as plastic. A light transmissive electrode 350 is formed to face the back electrode 351. A movable body 353 made of, for example, microcapsules is provided as an electronic ink layer between the light transmissive electrode 350 and the back electrode 351.

  In the screen 300, the light transmissive electrode 350 side is a surface on which image light is projected. The light transmissive electrode 350 and the back electrode 351 are divided for each reflectance control band, and a voltage is applied to each of the divided light transmissive electrode 350 and the back electrode 351.

  For example, as shown in FIG. 5, the moving body 354 includes a light reflection portion 355 made of a first conductivity type, for example, negatively charged white particles, and a light absorption portion 356 made of a second conductivity type, for example, positively charged black particles. Is enclosed in a dispersion medium 357 in a microcapsule 354.

In the electronic paper type screen 300 having the configuration shown in FIG. 4, the reflectance is controlled as follows.
For example, a positive voltage is applied to the light transmissive electrode 350 side, and a negative voltage is applied to the opposing back electrode 351 side. At this time, in the moving body 354, the light reflecting portion 355 made of negatively charged white particles shown in FIG. 5 moves to the light transmitting electrode 350 side, and the light absorbing portion 356 made of positively charged black particles becomes the back electrode. Move to the 351 side. As a result, the reflectance of the surface of the screen 300 can be controlled to be high by the light reflecting portion 355 moved to the light transmitting electrode 350 side.

On the other hand, when a negative voltage is applied to the light transmissive electrode 350 side and a positive voltage is applied to the opposite back electrode 351 side, the reverse state occurs. That is, in the moving body 354, the light absorbing portion 356 made of positively charged black particles moves to the light transmitting electrode 350 side, and the light reflecting portion 355 made of negatively charged white particles moves to the back electrode 351 side. To do. As a result, the reflectance of the screen surface can be controlled to be low by the light absorbing portion 356 moved to the light transmissive electrode 350 side.
Since the light transmissive electrode 350 and the back electrode 351 are configured to be divided for each reflectance control band, the reflectance of each reflectance control band of the screen is controlled by sequentially controlling each electrode to be plus or minus. It can be controlled in accordance with the scanning of the image light.

In the case of an electronic paper type screen as described above, it is configured by a simple structure in which an electrode layer and an electronic ink layer are simply stacked on a film as a base material, so that it can be wound at low cost. Suitable for screen configuration.
Further, in the conventional electronic paper display device, since it is necessary to drive every pixel in units of pixels, a complicated circuit for driving the two-dimensional matrix electrode is required. However, in the screen of the above-described electronic paper type configuration, it is not necessary to provide a two-dimensional complicated electrode. If an electrode is formed for each reflectance control zone that divides the screen, and a power source is driven in each electrode. Good. For this reason, a screen can be comprised by a very simple circuit.

  In the screen having the above-described configuration, the reflectance control band is divided in the vertical direction of the screen as shown in FIG. By dividing the screen in one direction as described above, an electrode layer, a movable body layer, and the like are continuously formed along the division direction. Therefore, peeling of each layer at the time of winding can be prevented by making the division direction of the reflection control band laminated | stacked continuously and the winding direction of a screen correspond. That is, since it can be wound up, a screen that can be easily stored can be provided.

  Next, a screen adopting the configuration of a reflective liquid crystal display will be described. FIG. 6 shows a schematic cross-sectional configuration diagram of an embodiment of the screen in this case.

As shown in FIG. 6, in this screen 300, for example, a reflection plate 361, a TFT substrate 362 on which pixel electrodes and driving transistors are formed, and an alignment film 363 are laminated on a glass substrate 360. Then, an alignment film 365, a light transmissive electrode 366, a glass substrate 367, and a polarizing plate 368 are stacked with a liquid crystal layer 364 and a spacer 369 interposed therebetween.
In this case, the polarizing plate 368 side is formed on the front surface side of the screen, and the reflecting plate 361 side is formed on the back surface side of the screen. Then, image light from the image projection device is projected on the polarizing plate 368 on the light transmissive electrode 366 side.

In the screen using the reflective liquid crystal display having the configuration shown in FIG. 6, the reflectance is controlled as follows.
For example, the TFT substrate 362 and the light transmissive electrode 366 are divided for each reflectance control band. Then, a voltage is applied to the liquid crystal layer 364 from the divided TFT substrate 362 and the light transmissive electrode 366, thereby changing the orientation of the liquid crystal layer 364. At this time, the amount of light transmitted through the liquid crystal layer 364 changes depending on the orientation of the liquid crystal layer 364. For this reason, by maximizing the amount of light transmitted through the liquid crystal layer 364, the light reflected by the reflector 361 provided on the lowermost layer side of the screen is maximized. In this case, the reflectance of the screen surface can be controlled to be high.
Further, by minimizing the amount of light transmitted through the liquid crystal layer 364, the light reflected by the reflection plate 361 provided on the lowermost layer side of the screen is minimized. In this case, the reflectance of the screen surface can be controlled to be low.
As described above, the reflectance of the screen surface can be controlled by applying a voltage to the liquid crystal layer 364.

  In this way, by using a reflective liquid crystal display for the screen of the present invention, as in the case of using the electronic paper described above, an electrode is formed for each reflectance control zone that divides the screen and a power source is driven in each electrode do it. For this reason, a screen can be comprised by a very simple circuit.

Next, the synchronization between the scanning position of the image light projected from the image projection apparatus and the control timing of each reflectance control band of the screen will be described with reference to FIG. FIG. 7 illustrates an example in which the screen 300 described in FIG. 1 is used, and the image display area of the screen 300 is divided into 16 to provide the reflectance control bands 301 to 316 as an example. 7A shows the position X of the image light at time t, and FIG. 7B shows the control states of the screen reflectance control bands 301 to 316 at the respective positions.
As shown in FIG. 7A, after scanning the image light from the scanning area of the reflectance control band 305 to the left edge of the screen, the image light is folded back at the left edge of the screen and scanned to the right edge of the screen, and further the reflectance control band from the right edge of the screen. A case where scanning is performed up to the scanning region 312 is shown.
And as shown to FIG. 7B, in the area | region where the image light is projected, the reflectance of a reflectance control zone | band is controlled to a high state, for example, white. In other regions, the reflectance of the reflectance control zone is controlled to a low state, for example, black. In this way, the reflectance of the reflectance control bands 301 to 316 is sequentially changed between a high state and a low state in accordance with the image light moving on the screen.

As a result, all of the projected one-dimensional image light is reflected by the reflectance control zone in which the reflectance is high. Further, at all times, only one reflectance control zone is controlled to have a high reflectance, and all the remaining reflectance control zones are controlled to have a low reflectance.
Therefore, the area with high reflectivity on the screen is extremely small, and the area with low reflectivity occupies a large amount, so that disturbance light reflected by the screen is extremely small. For this reason, a decrease in contrast can be prevented.

In this embodiment, the screen is divided into 16 parts, and the reflectance control bands 301 to 316 corresponding to the number of divisions have been described. However, the number of screen divisions is not limited to this, and the contrast improvement effect increases as the number of divisions increases.
Here, suppose that the reflectance of the reflectance control zone controlled to a high reflectance state is 100%, and the reflectance of the reflectance control zone controlled to a low reflectance state is 0%. In addition, the screen is divided into n reflectance control bands, and image light from the projection device is sequentially projected onto any one of the reflectance control bands. Only the reflectance control band on which the image light is projected is controlled to have a high reflectance, and the reflectance of the remaining reflectance control bands is controlled to have a low reflectance.

At this time, the probability that ambient light is reflected by the screen is the ratio 1 / n of the area of the reflectance control band that is controlled to be high with respect to the number n of the reflectance control bands on the screen, and this reflectance. It is a product of 100% and can be expressed as 100 / n%.
For this reason, as the number of divisions n increases, the area that reflects disturbance light decreases, and the probability of reflecting disturbance light decreases, so the contrast improvement effect increases. Therefore, the greater the number of divisions, the smaller the influence of disturbance light and the higher the contrast.

Note that the maximum number of divisions of the screen is determined by the scanning speed of the projected image and the response speed of the reflectance control zone constituting the screen. When the scanning speed of the projected image is constant, the number of screen divisions can be increased as the response speed of the screen increases. For this reason, contrast can be improved, so that the response speed of a screen is high.
For example, when an image signal of 120 frames / second is displayed on the screen while being moved 120 times per second, the screen can be divided into 16 at maximum if the response speed of the screen is 0.2 ms.

In the example described with reference to FIG. 7, the reflectances of the reflectance control zones are sequentially controlled one by one. However, in this case, it is difficult to synchronize the image light and the continuous reflectance control band at the boundary between adjacent reflectance control bands, and there is a possibility that a part of the scanning area becomes black.
In this case, for example, when image light passes between adjacent reflectance control bands, both the front and rear reflectance control bands may be controlled to have a high reflectance at the same time. Thereby, it is possible to easily synchronize the scanning position of the image light and the control timing of the reflectance control band at the boundary between adjacent reflectance control bands.

FIG. 8 shows the relationship between the scanning position of the image light and the control state of the reflectance control band in this case. In FIG. 8, parts corresponding to those in FIG.
In this example, the screen is divided into 32 and the reflectance control bands 301 to 332 are provided. In FIG. 8A, the position X of the image light at time t is shown, and the control of the reflectance control bands 301 to 332 of the screen is performed. The state is shown in FIG. 8B.
In FIG. 8, the response speed of the screen and the scanning speed of the image light are the same as in the example shown in FIG. Further, the time for controlling the reflectance of the reflectance control zone to a high state is the same as the example shown in FIG.

In FIG. 8A, the image light is scanned from the region of the reflectance control band 310 to the left edge of the screen, then folded at the left edge of the screen and scanned to the right edge of the screen, and further scanned from the right edge of the screen to the reflectance control band 324. Shows the state.
As shown in FIG. 8B, in the region where the image light is projected, the reflectance of the reflectance control zone is controlled to a high state, for example, white. Furthermore, the reflectance of any one of the reflectance control bands adjacent to the area where the image light is projected is controlled to be high. For this reason, the reflectances of the two reflectance control bands are always controlled to be high on the screen.
In other regions, the reflectance of the reflectance control zone is controlled to a low state, for example, black. In this way, the reflectivity of the reflectivity control bands 301 to 332 is sequentially changed between a high state and a low state in accordance with the scanning position of the image light moving on the screen.

  By controlling the reflectance of the reflectance control band as described above, both adjacent reflectance control bands have a high reflectance even if the scanning position of the image light falls on the boundary between the adjacent reflectance control bands. Since the state is controlled, it is not necessary to strictly synchronize the scanning position with the boundary of the reflectance control band, and inconveniences such as partial blackening are avoided. Therefore, it is possible to display an image with better contrast.

In the example shown in FIG. 8, the reflectance of the two reflectance control bands is always controlled to be high on the screen. However, since the area of the image light on the screen is usually smaller (narrower) than the area of the reflectance control zone, this is not the case. In order to avoid the inconvenience of becoming black at the boundary between adjacent reflectance control bands, it is only necessary that the reflectance of the two adjacent reflectance control bands is high while the image light scans the boundary.
For this reason, as shown in FIG. 8, it is not always necessary to control the reflectances of the two reflectance control bands to a high state. Then, at least at the timing when the boundary between the reflectance control bands adjacent to the image light is scanned, the reflectances of the two adjacent reflectance control bands may be controlled to be high.

  Further, in the relationship between the scanning position of the image light and the control state of the reflectance control band described in FIGS. 7 and 8 described above, at a certain period, for example, at the timing when the image light is scanned to the edge of the screen, You may control the reflectance of all the reflectance control zones to a low state. Thereby, it is possible to prevent afterimages and blurring due to continuous scanning of image light, and to further improve the contrast.

  The present invention is not limited to the above-described configuration, and various other configurations can be employed without departing from the gist of the present invention.

It is a schematic block diagram of an example of the image projection apparatus which concerns on one Embodiment of the image projection method of this invention. It is a schematic block diagram of an example of the image projection apparatus which concerns on one Embodiment of the image projection method of this invention. It is a schematic block diagram of an example of the image projection apparatus which concerns on one Embodiment of the image projection method of this invention. 1 is a schematic cross-sectional configuration diagram of a screen according to an embodiment of the present invention. 1 is a schematic cross-sectional configuration diagram of a screen according to an embodiment of the present invention. It is a schematic sectional block diagram of the principal part of the screen which concerns on one embodiment of this invention. 1 is a schematic cross-sectional configuration diagram of a screen according to an embodiment of the present invention. It is a figure which shows the relationship between the scanning position of the image light which concerns on one Embodiment of the image projection method of this invention, and the control state of the reflectance control zone | band of a screen. It is a figure which shows the relationship between the scanning position of the image light which concerns on one Embodiment of the image projection method of this invention, and the control state of the reflectance control zone | band of a screen.

Explanation of symbols

  46 one-dimensional image, 47 image display area, 48a, 48b, 340 non-display area, 100 light source, 101 illumination optical system, 102 light modulation device, 105 light selection unit, 106 projection lens, 107 scanning optical unit, 109 control device, 110 signal processing unit, 120 projection optical unit, 200 image display device, 201 image light, 301 to 316 reflectance control band, 341 light receiving unit, 342 signal light, 300 screen, 350, 366 light transmissive electrode, 351 back electrode, 352 substrate, 353 moving body, 354 microcapsule, 355 light reflecting portion, 356 light absorbing portion, 357 dispersion medium, 360, 367 glass substrate, 361 reflecting plate, 362 TFT substrate, 363, 365 alignment film, 364 liquid crystal layer, 368 Polarizer

Claims (10)

An image projection method comprising: controlling a reflectance of a region where image light is scanned on a screen higher than a reflectance of a region where image light is not scanned.   The image projection method according to claim 1, wherein a reflectance of a region adjacent to a region where the image light is scanned is made higher than a reflectance of another region.   The control of the reflectance is performed by transmitting a signal for adjusting the timing of the reflectance control on the screen from the control device of the projection device that projects the image light to the screen. Image projection method.   The image projecting method according to claim 1, further comprising: a light receiving unit outside a region for displaying the image of the screen, and projecting light to the light receiving unit to adjust a timing of reflectance control in the screen. .   The image projecting method according to claim 4, wherein the light receiving portion is made of a light absorbing material.   The image projection method according to claim 1, wherein a timing for controlling the reflectance to be low is provided on the entire surface of the screen.   The image projection method according to claim 1, wherein an image is displayed on the screen by scanning a one-dimensional image light. It has a surface that reflects image light scanned and projected from the front in the incident direction of light,
The screen according to claim 1, wherein the surface is controllable to reflectivity in two steps of high reflectivity and low reflectivity. A substrate comprising a light transmissive electrode and a back electrode is disposed oppositely,
Between the light transmissive electrode and the back electrode, a moving body having a light reflecting portion charged to the first conductivity type and a light absorbing portion charged to the second conductivity type is disposed,
9. The reflective part of the moving body is disposed on the surface side of the screen by sequentially controlling the voltage applied to the divided light transmissive electrode or the back electrode. Screen described. A light transmissive substrate, a polarizing plate, a liquid crystal layer, and a reflective plate,
9. The screen according to claim 8, wherein the voltage applied to the liquid crystal is sequentially controlled by the divided electrodes, whereby the reflectance of the screen is controlled by changing the amount of light transmitted through the liquid crystal.

Images