JP2016170306A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device that displays both dazzling light and an influence on a transparent object, such as a windshield, with high reproducibility.SOLUTION: A display device comprises: a screen 21 that can switch between a transparent state and a scattering state to light and displays a foreground image; a screen control device 31 that performs switching control between the transparent state and the scattering state; a video control device 51 that projects a dazzling light image on the screen 21 in a state other than the scattering state on the basis of a preset condition; and a liquid crystal display 41 that is arranged at a position where an observer can visually recognize a background image through the screen 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device that displays an image on a screen or the like.

  2. Description of the Related Art Conventionally, a drive simulator, a flight simulator, and the like have been used to train driving and control of vehicles such as automobiles and aircraft. Such a simulator includes a monitor or the like for viewing a scenery or the like that can be seen from a driver's seat or a cockpit, and performs operations such as driving while a person to be trained visually recognizes the monitor.

  Here, there are always transparent objects such as windshields and windshields in front of the driver's seat and on the trainee's line of sight. When simulating the effects of weather, it is necessary to simulate the effects of these transparent objects. Become.

  As a simulation of the influence of the transparent object as described above, for example, a simulated visual field generation display device described in Patent Document 1 has been proposed. Patent Document 1 describes that a transmissive screen is provided in front of a trainee, and a visual field obstruction image such as rain or snow is projected from the projector onto the transmissive screen.

JP-A-9-146447

  It is described that the simulated visual field generation display device described in Patent Document 1 can simulate dazzling due to lights of oncoming vehicles in addition to rain and snow. The transmissive screen used in Patent Document 1 is controlled so as to have a specific transmittance according to the visual field obstacle image. Further, in order for the trainee to visually recognize rain, snow, and the like, it is necessary to set the transmittance to such an extent that a visual field obstruction video is displayed. However, if the transmittance is reduced in order to display a field-of-view image, light due to dazzling is attenuated, and sufficient dazzling cannot be expressed. In addition, because the light due to dazzling and rainwater and snow reflected on the screen are irradiated at the same timing, not only light due to dazzling but also rainwater and other things that should not be dazzling are dazzled by light leakage, Will be different. Therefore, it is difficult to display both a visual field obstruction image and sufficient light dazzling, such as reproducing dazzling due to the headlight of an oncoming vehicle with rain attached to the windshield.

  That is, in the case of Patent Document 1, there is a problem that the reproducibility when displaying both the dazzling light (dazzling light) and the influence of the transparent object such as the windshield is low.

  Therefore, in view of the above-described problems, an object of the present invention is to provide a display device that displays with high reproducibility both the dazzling light and the influence of a transparent object such as a windshield.

  In order to solve the above-described problem, the invention according to claim 1 is a screen that can switch between a transmission state and a scattering state with respect to light and displays a foreground image by a projector, and the transmission state and the scattering state. A screen control unit that performs switching control of the projector, a projector control unit that controls the projector to project a dazzling light image on the screen in a state other than the scattering state based on a preset condition, and an observer through the screen And a background image display unit disposed at a position where the background image can be visually recognized.

  According to the eighth aspect of the present invention, the screen can be switched between a transmission state and a scattering state with respect to light and the foreground image is displayed by the projector, and the viewer can view the background image through the screen. A display method of a display device having a background image display unit arranged, wherein a screen control step of performing switching control between the transmission state and the scattering state, and dazzling light based on preset conditions And a projector control step of controlling the projector so that an image is projected onto the screen in a state other than the scattering state.

1 is a schematic configuration diagram of a display device according to a first embodiment of the present invention. It is typical sectional drawing of the screen shown by FIG. It is explanatory drawing of the projector which projects in synchronization with the optical characteristic of the screen shown by FIG. 2 is a timing chart of the operation of the display device shown in FIG. It is explanatory drawing which showed the example of the foreground image displayed on the display apparatus shown by FIG. 1, a dazzling light image, and a background image. It is explanatory drawing which showed the visual recognition state from the observer at the time of displaying each image shown by FIG. 2 is a flowchart of the operation of the screen control device shown in FIG. 1. 2 is a flowchart of the operation of the video control apparatus shown in FIG. It is a schematic block diagram of the display apparatus concerning the 2nd Example of this invention. It is a schematic block diagram of the display apparatus concerning the 3rd Example of this invention. It is a timing chart of operation | movement of the display apparatus shown by FIG. It is a typical front view of the structure of the screen concerning the other Example of this invention.

  Hereinafter, a display device according to an embodiment of the present invention will be described. A display device according to an embodiment of the present invention includes a screen that can switch between a transmissive state and a scattered state with respect to light and displays a foreground image by a projector, and a screen control that performs switching control between the transmissive state and the scattered state. And a projector control unit that controls the projector to project a dazzling light image onto the screen in a state other than the scattering state based on preset conditions, and a position at which the observer can visually recognize the background image through the screen. A background image display unit. By doing so, it is possible to project a dazzling light image when the screen is in a transmissive state and to display a foreground image imitating a windshield when in a scattered state. Then, by alternately switching between the transmission state and the scattering state within one frame period, for example, the light from the screen is averaged (integrated) to human eyes, and both have high visibility. Therefore, both the dazzling light and the influence of the transparent object such as the windshield are displayed with high reproducibility.

  Moreover, the preset condition may be set based on the background image. In this way, the background image, for example, clear or rainy weather, daytime or night, or the direction of travel (whether it is exposed to direct sunlight or not), a dazzling light image depending on the external situation that can be derived from the background image Can be projected.

  Further, the projector control unit may generate a dazzling light image from the background image. By doing so, it is not necessary to prepare a dazzling light image in advance. Further, it is possible to easily cope with the case where the environment for simulation is added or changed.

  Further, the background image and the dazzling light image may be projected from the same projector. By doing so, the number of projectors installed can be reduced. Further, the configuration is facilitated when a dazzling light image is generated from a background image and projected.

  The background image display unit may include a reflection unit that reflects the projection light from the projector toward the screen. By doing in this way, the optical axis of a background image, a foreground image, and a dazzling light image can be match | combined. Accordingly, it is possible to make it difficult for an observer such as a trainee to feel uncomfortable.

  Further, a plurality of screens that can switch between a transmission state and a scattering state with respect to light and on which a background image is displayed by a projector may be arranged along the viewing direction of the observer. By doing in this way, not only a windshield and a background image but the rain, snow, etc. which are falling can be displayed on another screen, Therefore A three-dimensional display can be performed.

  One of the plurality of screens may be used as a background image display unit for displaying a background image. By doing in this way, the optical axis of a background image, a foreground image, and a dazzling light image can be match | combined. Accordingly, it is possible to make it difficult for an observer such as a trainee to feel uncomfortable.

  Further, the display method of the display device according to the embodiment of the present invention performs switching control between the transmission state and the scattering state in the screen control step, and displays the dazzling light image based on the conditions set in advance in the projector control step. The projector is controlled so that it is projected onto the screen in a state other than the scattering state. By doing so, it is possible to project a dazzling light image when the screen is in a transmissive state and to display a foreground image imitating a windshield when in a scattered state. Then, by alternately switching between the transmission state and the scattering state within one frame period, for example, the light from the screen is averaged (integrated) to human eyes, and both have high visibility. Therefore, both the dazzling light and the influence of the transparent object such as the windshield are displayed with high reproducibility.

  A display device 1 including a display control device according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the display device 1 includes a screen 21, a screen control device 31, a liquid crystal display 41, and a video control device 51, and a projector 11 is connected to the display device 1.

  The projector 11 can use a transmission-type or reflection-type liquid crystal light valve that sequentially shifts the black state (a state in which no projection light is emitted) on the screen 21 during the scanning cycle, but other elements may be used. The projector 11 may perform raster scanning in the video scanning cycle and project video light (image light) on the display surface of the screen 21 dot-sequentially. That is, video light is projected intermittently at a predetermined cycle. As the projector 11, for example, a laser projector or the like in which the irradiation direction of the intensity-modulated light beam is reflected by a movable mirror and shaken can be used. The projector 11 can be considered in the same manner as the image light irradiation position being sequentially scanned in one direction on the screen 21.

  The projector 11 may be any projector that can project video light modulated by video information (image information) onto the screen 21. Note that the video information is obtained from a video signal input to the projector 11. Video signals include, for example, NTSC (National Television Standards Committee), analog video signals such as PAL (Phase Alternation by Line), MPEG-TS (Moving Picture Experts Group-Transport Stream) format, HDV (High -There are video signals in digital format such as Definition Video) format. The projector 11 may receive not only a moving image video signal but also a still image video signal such as JPEG (Joint Photographic Experts Group). In this case, the projector 11 may scan the screen 21 repeatedly with the same video light for displaying a still image.

  The screen 21 may be any screen that can change the optical state by applying a voltage. As for the optical state of the screen 21, a scattering state is an image state, and a transparent transmission state in which scattering of incident light is smaller and parallel light transmittance is higher than that is a non-image state. That is, it is possible to switch between a transmission state and a scattering state with respect to light.

  The screen 21 may be, for example, a light control screen that uses a liquid crystal material and changes a scattering state and a transparent transmission state in which scattering of incident light is small. The light control screen uses, for example, a liquid crystal element such as a polymer-dispersed liquid crystal, or an element that controls a transparent transmission state with small scattering of incident light by moving white powder in a transparent cell. There are things that use etc.

  FIG. 2 is a schematic cross-sectional view of the screen 21 that can control the optical state. The screen 21 shown in FIG. 2 has an optical layer 25 in which a composite material containing liquid crystal is sandwiched between a pair of transparent glass plates 23 and 24. A counter electrode 26 is formed on the entire surface of one glass plate 24 on the optical layer 25 side. A control electrode 27 is disposed on the entire surface of the other glass plate 23 on the optical layer 25 side. An intermediate layer made of an insulator may be formed between the electrodes 26 and 27 and the optical layer 25.

  The counter electrode 26 and the control electrode 27 are formed as transparent electrodes by using, for example, ITO (indium tin oxide). The optical layer 25 is disposed between the control electrode 27 and the counter electrode 26.

  A voltage is applied to the screen 21 so as to generate a potential difference between the counter electrode 26 as the first electrode and the control electrode 27 as the second electrode. The optical state in the optical layer 25 varies depending on the voltage applied to the counter electrode 26 and the control electrode 27.

  The screen 21 is classified into a reverse mode and a normal mode according to a state when a voltage is applied so as to generate a potential difference. The screen 21 operating in the reverse mode is in a transparent transmissive state in a normal state where no voltage is applied. When a voltage is applied, it becomes a scattering state with a scattering rate of parallel rays according to the applied voltage. In a screen operating in the normal mode, the screen is in a scattering state in a normal state where no voltage is applied. When a voltage is applied, a transparent transmission state with parallel light transmittance corresponding to the applied voltage is obtained. As for the optical state of the screen 21, a predetermined scattering state corresponds to an image state, and a transparent transmission state having a higher parallel light transmittance than that corresponds to a non-image state. In this embodiment, the reverse mode is described, but the normal mode is also applicable.

  The screen control device 31 as the screen control unit controls the screen 21 on which the video (image) is projected as light to scatter the projected video light, and controls the screen 21 to be in a transmissive state when it is not projected. As shown in FIG. 1, the screen control device 31 is connected to the screen 21 and the video control device 51. The screen control device 31 performs switching control between the optical state of the screen 21, that is, the transmission state and the scattering state, in synchronization with the image displayed on the projector 11. The screen control device 31 receives an image periodic signal (synchronization signal) such as a vertical synchronization signal from the video control device 51, and controls the optical state of the screen 21 based on the synchronization signal.

  The liquid crystal display 41 as the background image display unit is installed on the opposite side of the screen 21 as viewed from the observer, that is, at a position where the observer can visually recognize the background image through the screen 21. Displays the supplied background image. In the present embodiment, the liquid crystal display 41 is used as the background image display unit. However, the present invention is not limited to this, and other display devices such as an organic EL (Electro Luminescence) display may be used.

  The video control device 51 as a projector control unit outputs a background image input from the outside to the liquid crystal display 41, and switches between a foreground image and a dazzling light image input from the outside and outputs them to the projector 11. The video control device 51 outputs an image synchronization signal such as a vertical synchronization signal included in the background image, the foreground image, or the dazzling light image to the screen control device 31.

  Next, in the display device 1 according to the present embodiment, a projection method of the projector 11 that projects in synchronization with the optical characteristics of the screen 21 will be described with reference to FIG. FIG. 3 is an explanatory diagram of a method in which the projector 11 projects image light at intervals. In this case, as shown in FIG. 3B, image light is projected on the screen 21 in a short period of time during a part of the scanning cycle. As shown in FIG. 3C, the screen 21 may be in a scattering state during the partial period.

  When the optical state of the screen 21 is controlled to the transmission state of the screen 21 in a period other than the part, the see-through characteristic of the screen 21 is not caused in the scanning cycle without causing a decrease in luminance of the image projected on the screen 21. Is obtained. In order to obtain the same luminance as compared with the case where image light is regularly projected, projection light whose intensity is approximately the reciprocal of the duty (duty: a) in the scattering state for one scanning period is required. It becomes. Therefore, in order to obtain a high see-through characteristic, a powerful pulsed projection light output is required.

  By controlling the projector 11 and the screen 21 in this way, the screen 21 has transparency that can recognize the object (the liquid crystal display 41) on the back surface thereof, but has the same brightness as that in the case of being always in a scattering state. Can scatter and transmit image light. That is, it is possible to achieve both a see-through property capable of recognizing the background object (liquid crystal display 41) and a high image visibility.

  Information on the switching timing for synchronization control between the projector 11 and the screen 21 is transmitted from the screen control device 31 to the screen 21 based on an image periodic signal such as a vertical synchronization signal output from the video control device 51. The video control device 51 and the screen control device 31 may be integrated or separate. In the case of a separate body, wireless communication using electromagnetic waves such as microwaves and infrared rays can be performed, and information for obtaining synchronization thereof may be exchanged by a radio signal. Similarly, wireless communication may be performed between the projector 11 and the video control device 51 and between the screen 21 and the screen control device 31.

  Next, an operation example of the display device 1 having the above-described configuration will be described with reference to a timing chart shown in FIG.

  First, the screen control device 31 turns on the screen 21 by turning on the screen control signal for the screen 21 in synchronization with a vertical synchronization signal (not shown) or the like. Then, the screen 21 switches to a scattering state through a transient state for a predetermined period. In the video control device 51, the screen display signal is turned on and the off-screen display signal is turned off after the period when the screen 21 is switched to the scattering state from the vertical synchronization signal or the like, and the foreground image (screen display video) is displayed to the projector 11. A foreground image is output for projection.

  Here, for example, when the display device 1 is used for a drive simulator, the screen 21 simulates a windshield. Therefore, what is displayed as a foreground image is raindrops, snow, dirt, dust, etc. adhering to the windshield. Alternatively, a state where rain or the like is removed by a wiper or a wiper may be reproduced and displayed.

  Note that the period from the vertical synchronization signal or the like until the screen display signal is turned on is determined by the transient state period of the screen 21. The period of the transient state can be calculated in advance from the characteristics of the optical layer 25 of the screen 21, the voltage applied to the electrodes, or the like, or can be obtained from experiments.

  Next, the screen display signal is turned off and the off-screen display signal is turned on after elapse of a predetermined period after the screen display signal is turned on. When the off-screen display signal is turned on, the video control device 51 outputs a dazzling light image so as to project a dazzling light image (light mole image) to the projector 11. After the screen display signal is turned off, the screen control device 31 turns off the screen control signal to make the screen 21 in a transparent state. Then, the screen 21 is switched to the transmission state through a transient state for a predetermined period. That is, the video control device 51 (projector control unit) controls the projector 11 to project onto the screen 21 in synchronization with the transmission state or scattering state of the screen 21.

  A dazzling light image is an image that simulates strong light that dazzles an observer. For example, when the display device 1 is used for a drive simulator, it becomes headlight light or sunlight of an oncoming vehicle.

  The period during which the screen display signal is ON is predetermined so as to be within the period during which the screen 21 is in the scattering state. That is, the period during which the screen display signal is ON is determined in advance to be within the period during which the screen control signal is ON.

  By operating in this way, the foreground image is displayed on the screen 21 during the scattering state, and the dazzling light image is displayed during the periods other than the scattering state. That is, when the screen 21 is not in the scattering state, strong light is projected from the projector 11 to simulate dazzling light (period T2 in FIG. 4). Therefore, in this embodiment, by utilizing the characteristics that achieve both the see-through property capable of recognizing the background object described above and the high visibility of the image, the dazzling light and raindrops attached to the windshield etc. It is displayed more clearly.

  In addition, in FIG. 4, a dazzling light image is displayed even when the screen 21 is in a transitional state. By doing so, reflection on the windshield or the like can be expressed (period T1, FIG. 4). T3).

  Further, as is apparent from the description of FIG. 4, the dazzling light image is an image projected mainly in a state other than the scattering state (transmission state, transient state).

  In the example of FIG. 4, the dazzling light image is always displayed. However, the dazzling light image is not displayed in a situation where no dazzling light occurs, for example, when there is no oncoming vehicle. In that case, the off-screen display signal remains OFF. That is, whether or not the dazzling light image is displayed based on the background image is set. That is, the dazzling light image is displayed based on a predetermined condition such that there is an oncoming vehicle at night and the sun is visible.

  The above operation is repeated every frame (one video cycle). The liquid crystal display 41 is always displayed.

  5 and 6 show display examples. FIG. 5A shows the foreground image (screen display image) displayed on the screen 21, FIG. 5B shows the dazzling light image (light mole image), and FIG. 5C shows the background image displayed on the liquid crystal display 41. To do. When this is displayed in the configuration shown in FIG. 1 as in the timing chart shown in FIG. 3, the images are displayed as shown in FIG. Both the foreground image of the raindrops adhering to the windshield and the dazzling light image of the headlight of the oncoming vehicle are displayed clearly.

  In addition, although the example shown in FIG.5 and FIG.6 was a rainy scene as a simulated scene, it is not restricted to it. For example, it may be a scene where a fog light of an oncoming vehicle or the like can be seen when it is foggy, or a scene where direct sunlight enters on a sunny day. If the weather is clear, no foreground image may be displayed if dirt or the like does not adhere to the windshield.

  Further, in addition to displaying a foreground image on the screen 21, the transmittance of the screen 21 may be adjusted to express windshield fogging, heavy rain, a large amount of dust, or the like. The transmittance of the screen 21 can be reduced by, for example, increasing the scattering state period of one frame period. Then, by displaying the dazzling light image in that state, it is possible to reproduce the light of the headlight of the oncoming vehicle in a state where the windshield is clouded, heavy rain, a large amount of dust, or the like.

  The operation described above is shown in the flowcharts of FIGS. The flowchart in FIG. 7 shows the operation of the screen control device 31. First, in step S11, it is determined whether or not a synchronization signal is detected. If it is detected (in the case of YES), the screen control signal is turned on (step S12). If the synchronization signal is not detected, step S11 is repeated until it is detected.

  Next, in step S13, it is determined whether or not the period for the scattering state has elapsed, and if it has elapsed, the screen control signal is turned OFF (step S14). If the period of time for the scattering state does not elapse, step S13 is repeated until elapses. The period may be measured using a timer or the like. The flowchart in FIG. 7 corresponds to a screen control process for performing switching control between the transmission state and the scattering state.

  The flowchart in FIG. 8 shows the operation of the video control device 51. First, in step S21, it is determined whether or not a synchronization signal has been detected. If it is detected (in the case of YES), it is further determined whether or not a transient state has elapsed in step S22. Is turned ON and the off-screen display signal is turned OFF (step S23). If the synchronization signal is not detected, step S21 is repeated until it is detected, and if the transient state does not elapse, step S22 is repeated until elapses. In the flowchart of FIG. 8, the transition state is determined. However, since at least the foreground image can be displayed as long as the screen 21 is in the scattering state, the transition state may not be required. .

  Next, in step S24, it is determined whether or not the period for displaying the foreground image has elapsed. If it has elapsed, the screen display signal is turned off and the off-screen display signal is turned on (step S25). If the period for displaying the foreground image has not elapsed, step S24 is repeated until the foreground image has elapsed. The flowchart in FIG. 8 corresponds to a projector control process for projecting a dazzling light image on the screen in a state other than the scattering state based on a preset condition.

  According to the present embodiment, the screen 21 on which the foreground image can be switched between the transmission state and the scattering state with respect to the light, the screen control device 31 that performs switching control between the transmission state and the scattering state, and the presetting On the basis of the determined conditions, a video control device 51 that projects a dazzling light image onto the screen 21 in a state other than the scattering state, and a liquid crystal display 41 that is disposed at a position where the observer can visually recognize the background image through the screen 21 are provided. doing. By doing so, it is possible to project a dazzling light image when the screen 21 is in a transmissive state and display a foreground image imitating a windshield when in a scattered state. Then, by alternately switching between the transmission state and the scattering state within one frame period, for example, the light from the screen is averaged (integrated) to human eyes, and high visibility of both is obtained. Therefore, both the dazzling light and the influence of the transparent object such as the windshield are displayed with high reproducibility.

  The conditions for displaying the dazzling light image are set in advance based on the background image. By doing so, it can be derived from the background image such as the state of the background image, such as whether there is an oncoming vehicle, whether it is sunny or rainy, daytime or nighttime, or the direction of travel (whether it is exposed to direct sunlight) A dazzling light image can be projected according to the external situation.

  Further, the foreground image and the dazzling light image are projected from the same projector 11. In this way, two types of images can be projected by using the same projector in a time division manner, and the number of projectors installed can be reduced. Of course, the foreground image and the dazzling light image may be projected from different projectors.

  Note that the foreground image and the dazzling light image may be input from the outside of the video control device 51 or may be stored in advance in the video control device 51. Of course, only one of them may be stored.

  Further, the same image as the background image may be projected as the dazzling light image. In this case, since the high-luminance part of the background image appears to be more emphasized, an effect like dazzling light can be produced. Further, the dazzling light image is not limited to an image in which only a part of the display area is brightened, but may be an image (for example, all white) that is displayed so that the entire display area is brightened. In this case, dazzling can be expressed using not the entire screen but the entire screen. That is, it is only necessary to simulate a dazzling phenomenon during driving or maneuvering.

  Further, the dazzling light image may be generated from the background image. For example, only high-luminance information (such as a headlight) can be extracted and generated from the background image. Or you may produce | generate the image which raised the brightness | luminance of the background image, and the image which cut the low-intensity part of the image as a dazzling light image. By doing so, it is not necessary to prepare a dazzling light image in advance. Further, it is possible to easily cope with the case where the environment for simulation is added or changed.

  Next, a display device according to a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  In the display device 1A of the present embodiment, the projector 11 is installed on the observer side. Further, the liquid crystal display 41 is changed to a half mirror display 41A. The operations of the screen control device 31 and the video control device 51 are the same as in the first embodiment.

  The half mirror display 41 </ b> A is a display device provided with a half mirror 41 </ b> A <b> 1 that transmits a background image displayed by itself, but reflects a foreground image and a dazzling light image projected from the projector 11 toward the screen 21. .

  In this embodiment, the foreground image and the dazzling light image projected from the projector 11 are reflected by the half mirror 41A1 of the half mirror display 41A and displayed on the screen 21. Accordingly, the optical axis can be aligned with the background image displayed by the half mirror display 41A itself.

  According to the present embodiment, the projector 11 is disposed on the viewer side, and the half mirror display 41A includes the half mirror 41A1 that reflects the projection light from the projector 11. By doing in this way, the optical axis of a background image, a foreground image, and a dazzling light image can be match | combined. Accordingly, it is possible to make it difficult for an observer such as a trainee to feel uncomfortable.

  Next, a display device according to a third embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  In the display device 1B according to the present embodiment, as shown in FIG. 10, the first screen 21a and the second screen 21b are arranged along the line of sight of the observer. A first projector 11a for the first screen and a second projector 11b for the second screen are installed on the opposite sides of these screens as viewed from the observer.

  In the present embodiment, the first screen 21a simulates a transparent object such as a windshield, similar to the screen 21 of the first and second embodiments. The second screen 21b displays a background image and the like in the same manner as the liquid crystal display 41 of the first and second embodiments. That is, the second screen 21b is disposed behind the first screen 21a when viewed from the observer.

  An operation example of the display device 1B of the present embodiment is shown in a timing chart of FIG. The first screen 21a is basically the same as that of the first embodiment, but since the display period of the second screen 21b is provided, the off-screen display signal is shortened.

  In the second screen 21b, the second screen display signal and the second screen display signal are turned ON during the period in which the first screen display signal and the first outside-screen display signal are turned OFF in one frame period. It is displayed so as not to overlap the display period of one screen 21a.

  Then, by projecting a video from the second projector during a period when the second screen display signal is at a high level, a background image is displayed on the second screen 21b.

  In FIG. 11, since the second screen 21b has see-through characteristics, the back side of the second screen 21b may be seen through from the viewer, but in this case, the first projector 11a and the second projector 11b are visible. By installing a black background plate or the like to the extent that it does not block the projection light from the camera, it is possible to reduce the uncomfortable feeling. Alternatively, the second screen control signal or the second screen display signal may be extended in order to extend the projection period of the background image to the end of one frame period.

  Further, the number of the screens 21 is not limited to two, and may be three or more. In this case, by arranging a projector corresponding to another screen 21 between the second screen 21b displaying the background image and the first screen 21a, for example, the snow attached to the windshield on the first screen 21a, By displaying the snow falling on another screen 21, a three-dimensional display can be performed.

  According to the present embodiment, since the first screen 21a and the second screen 21b are arranged along the line of sight of the observer, the opposite sides of the first screen 21a and the second screen 21b as viewed from the observer. The 1st projector 11a and the 2nd projector 11b can be arrange | positioned. Therefore, the optical axes of the background image, the foreground image, and the dazzling light image can be matched. Accordingly, it is possible to make it difficult for an observer such as a trainee to feel uncomfortable.

  In the embodiment described above, as shown in FIG. 3, the image light is projected on the entire surface of the screen 21 in a short period of time during a part of the scanning cycle. However, as shown in FIG. In other words, the screen 21 may be divided into regions in which the screen 21 is in a scattering state from the top and the image light is projected onto the scattering region.

  In FIG. 12, the area irradiated with the image light on the screen 21 is divided into strips in one direction (for example, the scanning direction) (divided area). In FIG. 12, the control electrode 27 is divided into a plurality of areas corresponding to the divided areas and individually connected to the screen control device 31 so that voltages can be individually applied.

  By configuring the screen 21 in this way, it is possible to switch between the scattering state and the transmission state for each divided region. Accordingly, the portion of the screen 21 irradiated with the scanning light is maintained in the video state. Thereby, the image light that scans the screen 21 is scattered by the screen 21 in the scattering state. Further, the portion of the screen 21 that is not irradiated with the scanning light is controlled to a non-image state. Each divided region is controlled to a transparent transmission state in a non-video state during most of the period not scanned by the scanning light. During the image light projection period, the see-through characteristic of the screen 21 is obtained while maintaining the image visibility.

  Each divided area of the screen 21 is controlled from the transparent transmission state to the scattering state before the timing when the image light starts to scan each area. Further, the divided region in the scattering state is controlled from the scattering state to the transparent transmission state after the scanning of the region is completed. That is, the control electrode 27 is divided into a plurality of regions, and the voltage application timing is sequentially switched so as to sequentially switch the timing for changing the optical state of the optical layer 25 corresponding to each region of the divided control electrode 27. It may be.

  Therefore, the screen 21 can scatter and transmit the image light with the same brightness as that in the case where the screen 21 is always in the scattering state while having transparency that can recognize the object on the back surface. That is, it is possible to achieve both a see-through property capable of recognizing a background object and a high image visibility.

  Even in such a configuration, by applying the configurations of the first, second, and third embodiments, it is possible to display both the dazzling light and the influence of the transparent object such as the windshield with high reproducibility. it can.

  In the above-described embodiment, the case where the display device 1 is mainly used as a drive simulator has been described. However, other vehicle simulators such as a flight simulator and a ship simulator may be used. Alternatively, it may be an amusement park attraction. In short, the present invention can be applied if it is necessary to achieve both dazzling light and display on a transparent object such as a windshield.

  Further, the background image and the dazzling light image may be projected from the same projector. In this case, during the period in which the dazzling light image is displayed, the luminance of a part (or all) of the background image increases. Further, the projector 11 at this time may be a DLP (registered trademark) (Digital Light Processing) type projector. In the case of the DLP (registered trademark) system, the projector 11 may display the background image and the dazzling light image using a subfield for expressing gradation. By doing so, the number of projectors installed can be reduced. Further, since the dazzling light image is generated from the background image, the configuration becomes easy.

  Further, the present invention is not limited to the above embodiment. That is, those skilled in the art can implement various modifications in accordance with conventionally known knowledge without departing from the scope of the present invention. Of course, such modifications are included in the scope of the present invention as long as the configuration of the display device of the present invention is provided.

DESCRIPTION OF SYMBOLS 1, 1A, 1B Display apparatus 11 Projector 11a 1st projector 11b 2nd projector 21 Screen 21a 1st screen 21b 2nd screen 31 Screen control apparatus (screen control part)
41 Liquid crystal display (background image display part)
41A half mirror display (background image display)
41A1 half mirror (reflecting part)
51 Video control device (projector control unit)

Claims (8)

A screen on which a foreground image can be displayed by a projector that can be switched between a transmission state and a scattering state with respect to light;
A screen control unit that performs switching control between the transmission state and the scattering state;
A projector control unit that controls the projector to project a dazzling light image on the screen in a state other than the scattering state, based on a preset condition;
A background image display unit arranged at a position where an observer can visually recognize a background image through the screen;
A display device comprising:   The display device according to claim 2, wherein the preset condition is set based on the background image.   The display device according to claim 1, wherein the projector control unit generates the dazzling light image from the background image.   The display device according to claim 3, wherein the background image and the dazzling light image are projected from the same projector.   The display device according to claim 1, wherein the background image display unit includes a reflection unit that reflects the projection light from the projector toward the screen.   5. The screen according to claim 1, wherein a plurality of screens capable of switching between a transmission state and a scattering state with respect to light and displaying the background image by a projector are arranged along the viewing direction of the observer. The display apparatus as described in any one of them.   7. The display device according to claim 6, wherein one of the plurality of screens is used as the background image display unit on which the background image is displayed. A screen on which a foreground image can be displayed by a projector that can be switched between a transmission state and a scattering state with respect to light;
A background image display unit arranged at a position where an observer can visually recognize a background image through the screen;
A display method for a display device having
A screen control step for performing switching control between the transmission state and the scattering state;
A projector control step of controlling the projector to project a dazzling light image on the screen in a state other than the scattering state, based on a preset condition;
A display method for a display device, comprising:

Images