JP7094654B2 - Display device - Google Patents

Description

The present invention relates to a display device.

In recent years, for example, vehicles equipped with a head-up display have begun to spread. The head-up display is, for example, a display device that displays vehicle information, road information, navigation information, and the like on a translucent display member called an image combiner (hereinafter, simply referred to as a combiner). The head-up display displays information contributing to the driving of the vehicle as described above as a virtual image in front of the windshield.

Further, for example, the head-up display has a configuration for displaying virtual images having different image formation positions from each other, so that it is possible to display an image having a depth according to an actual landscape. For example, Patent Document 1 discloses a stereoscopic image display device including an image display projector and a plurality of liquid crystal dimmers.

Japanese Patent Application Laid-Open No. 2002-228975

For example, in consideration of displaying a deep virtual image in a head-up display, it is conceivable to arrange a plurality of screens having different positions from the combiner and display an image on each of the screens. Further, considering the image quality of the virtual image, it is preferable not to reduce the frame rate of the entire virtual image.

When displaying an image on each of a plurality of screens without reducing the frame rate, for example, the light source that generates the image is required to switch the image at a frequency higher than the normal refresh rate. In this case, for example, it is required to use a high-performance and expensive light source. Further, as an example, it is required to control the operation of not only the light source but also the screen and other components in a complicated manner.

The present invention has been made in view of the above points, and one of the problems is to provide a display device capable of displaying a deep and high-quality image with a simple configuration and simple operation control. There is.

The invention according to claim 1 is a light source that emits emitted light from an emitting portion and irradiates the emitted light to a predetermined irradiation region, and the invention is arranged in the irradiation region and does not overlap each other on a straight line passing through the emitting portion. It is characterized by having a plurality of screens having a projection area at a position and a reflective member arranged on a straight line passing through all of the projection areas of each of the plurality of screens.

(A) is a diagram schematically showing the configuration of the display device according to the first embodiment, and (b) is a diagram schematically showing the configuration of the display unit in the display device according to the first embodiment. (A) is a diagram showing a screen drive signal by the drive unit in the display device according to the first embodiment, and (b) is a diagram showing an image example generated by the image data generation unit in the display device according to the first embodiment. Yes, (c) is a diagram schematically showing a virtual image generated by the display device according to the first embodiment. (A) is a diagram schematically showing an arrangement configuration of a display unit and a reflection unit in the display device according to the first embodiment, and (b) is a diagram schematically showing an arrangement configuration of a light source and a screen in the display device according to the first embodiment. It is a figure shown in. (A) is a diagram schematically showing a configuration of a display device according to a modified example of the first embodiment, and (b) is a diagram showing a screen drive signal by a drive unit in the display device according to the modified example of the first embodiment. Is. It is a figure which shows typically the structure of the display device which concerns on Example 2. FIG.

Examples of the present invention will be described in detail below.

FIG. 1A is a diagram schematically showing the configuration of the display device 10 according to the first embodiment. In this embodiment, the display device 10 is a head-up display mounted on a vehicle (not shown) and displaying a virtual image VI. Note that FIG. 1A shows a virtual image VI displayed by the display device 10 with a broken line. Further, FIG. 1A shows the position of the eyes of an observer observing the virtual image VI, for example, the driver of the vehicle, as the viewpoint EY.

In the present specification, the direction along the observation direction of the observer observing the virtual image VI is defined as the z-axis direction, and the directions perpendicular to the z-direction and perpendicular to each other are defined as the x-axis direction and the y-axis direction, respectively. .. Further, the x-axis direction may be the width direction (horizontal direction), the y-axis direction may be the height direction (vertical direction), and the z-axis direction may be the depth direction (front-back direction). Further, the direction from the viewpoint EY to the virtual image VI is the front. That is, the virtual image VI is displayed in front of the observer.

The display device 10 has a light source 20 capable of irradiating a predetermined area with light. Further, the light source 20 has an emission unit EP that emits light (emission light L1) for displaying a virtual image VI. That is, the light source 20 emits the emitted light L1 from the emitting portion EP, and irradiates the predetermined irradiation region with the emitted light L1.

For example, the light source 20 is a projector that projects an image (video). In this embodiment, the light source 20 is a scanning type laser projector that scans the laser beam and irradiates the predetermined area with the laser beam. For example, the light source 20 has a laser element (not shown) that generates a laser beam as the emitted light L1 and a scanning element (not shown) that scans the laser beam. Further, the light source 20 has an emission point of laser light as an emission unit EP.

The display device 10 has a screen group 30 including a plurality of screens S1, S2, and S3 on which an image is displayed by being irradiated with the light L1 emitted from the light source 20. In this embodiment, the screen group 30 is composed of three screens S1 to S3. Further, each of the screens S1 to S3 has a flat plate shape.

For example, each of the screens S1 to S3 of the screen group 30 has a state between a transmitted state (non-display state) in which the emitted light L1 from the light source 20 is transmitted and a scattered state (display state) in which the emitted light L1 is scattered. It is a variable state screen that changes. The transmission state is, for example, a state in which the screen is transparent and allows the emitted light L1 to pass through without being scattered.

In the present embodiment, each of the screens S1 to S3 is laminated on a liquid crystal layer (not shown) containing a liquid crystal molecule and a liquid crystal layer with the liquid crystal layer interposed therebetween, and an electrode layer for switching the state of the liquid crystal molecules in the liquid crystal layer. Includes a liquid crystal film having (not shown). For example, each of the screens S1 to S3 may have a configuration in which a liquid crystal film is attached on a translucent substrate such as glass or resin. Further, for example, each of the screens S1 to S3 may be a rigid liquid crystal panel. It should be noted that each of the screens S1 to S3 is not limited to the case where the liquid crystal film is included. For example, the screens S1 to S3 may be a translucent plate including a microlens.

Here, the configuration and arrangement of the light source 20 and the screen group 30 will be described with reference to FIGS. 1 (a) and 1 (b). FIG. 1B is a diagram schematically showing a screen group 30 as seen from the exit portion EP of the light source 20. First, as shown in FIG. 1 (b), the light source 20 irradiates the predetermined irradiation region SA with the emitted light L1 from the emitting portion EP. For example, the laser light source as the light source 20 emits the laser light as the emitted light L1 and scans the laser light with the irradiation region SA as the scanning region. For example, the light source 20 scans the laser beam in the irradiation region SA by raster scanning.

In this embodiment, the irradiation region SA has a rectangular shape having an irradiation width SV and an irradiation height SH. For example, in this embodiment, the irradiation region SA is a scanning region for scanning the laser beam as the emitted light L1. Further, the irradiation width SV and the irradiation height SH correspond to the scanning width and the scanning height of the scanning region for scanning the laser beam, respectively. For example, the light source 20 has a plurality of scanning lines along the direction of the irradiation width SV, and the emitted light L1 is irradiated into the irradiation region SA by sequentially scanning the scanning lines.

The screens S1 to S3 are respectively arranged in the irradiation region SA of the emitted light L1 and have projection regions A1 to A3 for projecting the virtual image VI. The projection areas A1 to A3 are areas in which the emitted light L1 on the screens S1 to S3 is irradiated. In this embodiment, almost the entire main surface of the screens S1 to S3 is the projection areas A1 to A3.

As shown in FIG. 1 (b), in the screen group 30, the screens S1, S2, and S3 each have projection regions A1, A2, and A3 at positions that do not overlap each other when viewed from the emitting unit EP. Specifically, each of the screens S1 to S3 has projection regions A1 to A3 arranged at positions that do not overlap each other on a straight line (light rays of the emitted light L1) including the emitted portion EP of the light source 20.

In this embodiment, the irradiation region SA of the emitted light L1 from the light source 20 is divided into three in the height direction, and the projections of the screens S1 to S3 are performed so that the emitted light L1 is irradiated to each of the divided regions. Areas A1 to A3 are arranged. For example, the scanning line of the laser light from the light source 20 is divided into three equal parts in the height direction, and each of the projection areas A1 to A3 is an irradiated area of the laser light corresponding to each of the divided scanning lines. In this embodiment, the entire screens S1 to S3 including the projection areas A1 to A3 are arranged so as not to overlap when viewed from the emission unit EP.

For example, the projection regions A1 to A3 in each of the screens S1 to S3 are state-variable members whose states change between a transmission state in which the emitted light L1 is transmitted and a scattering state in which the emitted light L1 is scattered, for example, dimming. It consists of a liquid crystal film of the formula.

Referring to FIG. 1A again, the display device 10 reflects the illuminated light L2 irradiated on the screens S1 to S3 (that is, the projected light for projecting an image on the projection areas A1 to A3) 40. Have. In this embodiment, the reflective member 40 is an image combiner and has translucency with respect to visible light. That is, the reflective member 40 is a translucent plate that transmits visible light.

The reflective member 40 is arranged on a straight line (light rays of the projected light L2) passing through all of the projected regions A1 to A3 of the screens S1 to S3. In other words, the reflective member 40 is arranged at a position where the projected light L2 from the projected regions A1 to A3 of all the screens S1 to S3 is incident when viewed from the reflective member 40. In other words, the projection regions A1 to A3 of the screens S1 to S3 are arranged so as not to overlap each other when viewed from the exit portion EP of the light source 20 and to overlap each other when viewed from the reflective member 40.

Specifically, in this embodiment, the screens S1 to S3 are arranged in parallel with each other, and the projection areas A1 to A3 are also arranged in parallel with each other. Further, the projection areas A1 to A3 of the screens S1 to S3 are arranged at predetermined intervals so as to overlap each other in the normal direction of the projection areas A1 to A3. Further, the reflective member 40 is arranged on an extension of the straight line when a straight line passing through all the projection regions A1 to A3 is drawn along the normal direction.

The screens S1 to S3 are not limited to the case where each of the projection areas A1 to A3 is arranged completely in parallel. For example, each of the screens S1 to S3 or each of the projection areas A1 to A3 (for example, each liquid crystal layer) is slightly tilted with respect to each other within a range that does not affect the displayed virtual image VI (for example, the shape of the image). You may be doing it.

Further, in this embodiment, the reflective member 40 has a concave surface portion 41 recessed with respect to the screen group 30. The concave surface portion 41 is arranged so as to face each of the projection regions A1 to A3 of the screens S1 to S3. In this embodiment, the concave surface portion 41 functions as a concave mirror with respect to the projected light L2.

For example, as shown in FIG. 1A, the emitted light L1 emitted from the light source 20 is incident on the screens S1 to S3 (projection regions A1 to A3). The light incident on the screens S1 to S3 is the projected light L2, and the projected light L2 is emitted from the surface opposite to the irradiation surface of the emitted light L1 in the direction perpendicular to the projection regions A1 to A3. Then, the projected light L2 travels toward the reflecting member 40.

When the observer observes the reflective member 40 from the viewpoint EY, the observer can visually recognize the virtual image VI on the back side (front in the z-axis direction) of the reflective member 40. Specifically, the observer visually recognizes a plurality of virtual images V1, V2, and V3 formed at positions corresponding to the distances between the screens S1, S2, and S3 and the reflective member 40, respectively, through the reflective member 40. Will be done.

The display device 10 has an image data generation unit 50 that generates image data VD projected on the screen group 30 to display the virtual image VI. The image data generation unit 50 acquires, for example, vehicle information indicating the state of the vehicle, peripheral information indicating information around the vehicle, navigation information for guiding the traveling of the vehicle, and the like from the outside, and displays these information. Generate image data VD.

The display device 10 has a drive unit 60 for driving the light source 20 and the screen group 30. The drive unit 60 acquires the image data VD from the image data generation unit 50, and generates a light source drive signal DS1 for driving the light source 20 and a screen drive signal DS2 for driving the screen group 30 based on the image data VD. The drive unit 60 supplies the light source drive signal DS1 to the light source 20. The light source 20 generates and irradiates the emitted light L1 corresponding to the image data VD by the light source drive signal DS1.

Further, the drive unit 60 drives the screen drive signal DS2 to the screen group 30. Each of the screens S1 to S3 of the screen group 30 is switched between the transmission state and the scattering state by the screen drive signal DS2.

FIG. 2A is a diagram schematically showing the screen drive signal DS2 generated by the drive unit 60. FIG. 2A shows a part of the timing chart of the screen drive signal DS2 (frame periods F1 and F2 only). The drive unit 60 generates a signal for switching between the transmission state and the scattering state of the screens S1 to S3 as the screen drive signal DS2.

For example, each of the screens S1 to S3 is in a scattered state when the screen drive signal DS2 is at the first potential level (for example, the ground potential), and is in a second potential level higher than the first potential level (for example, the power supply potential). At the time of, it becomes a transparent state. In this embodiment, each of the projection areas A1 to A3 of the screens S1 to S3 changes to a transmission state (non-display state) when energized, that is, when a voltage is applied (when referred to as a normal mode). There is).

In this embodiment, as shown in FIG. 2A, the driving unit 60 drives the screen S1 at the position farthest from the reflective member 40 among the screens S1 to S3 so as to be in a scattered state at all times. This is because even if the projection region A1 of the screen S1 at the position farthest from the reflective member 40 is always in a scattered state (display state), it does not affect the display images of the other screens S2 and S3.

Specifically, in this embodiment, the screens S1 to S3 (projection regions A1 to A3) are arranged so as not to overlap each other in the irradiation region SA of the light source 20. Therefore, the emitted light L1 from the light source 20 is irradiated at different timings in each of the projection regions A1 to A3. Therefore, in order to project each of the virtual images V1 to V3, only considering that each of the projected lights L2 from the projection areas A1 to A3 is incident on the reflecting member 40 at different timings for each of the projection areas A1 to A3. , Each of the screens S1 to S3 may be driven.

Therefore, for example, when the screen S2 is in the scattered state (display state), the emitted light L1 from the light source 20 is incident on the screen S2 without being blocked by the screen S1 even if the screen S1 is in the display state. Therefore, when the projected light L2 from the screen S2 is incident on the reflecting member 40, the screen S3 may be in a transmitted state. Similarly, when the screen S3 is in a scattered state, the screens S1 and S2 may be in a scattered state.

Therefore, the drive unit 60 can drive the screen S1 so that the screen S1 farthest from the reflective member 40 is always in a scattered state. Therefore, the drive control of the screen group 30 can be simplified, and the switching load applied to the screen group 30 can be reduced.

It should be noted that each of the screens S1 to S3 is not limited to the case where the screens S1 to S3 are driven in the manner shown in FIG. 2 (a). For example, the drive unit 60 may drive the screens S1 to S3 so that any one of the projection areas A1 to A3 is in a scattered state (display state) with respect to the projection areas A1 to A3 of the screens S1 to S3. ..

FIG. 2B is a diagram showing an example of an image data VD generated by the image data generation unit 50. FIG. 2B shows the image data VD in the frame period F1. For example, the light source 20 generates and emits an emitted light L1 that displays an image as shown in FIG. 2B during the frame period F1. Further, the image data VD includes images projected on the screens S1 to S3 in one frame, that is, data for virtual images V1 to V3 divided in the height direction.

FIG. 2C is a diagram schematically showing the displayed virtual image VI. When the image data VD shown in FIG. 2B is projected onto the screen group 30, three virtual images V1 to V3 are displayed at different positions in the front-rear direction when viewed from the viewpoint EY as shown in FIG. 2C. .. Further, three virtual images V1 to V3 are generated and displayed within one frame period F1, that is, within one video cycle.

For example, the light source 20 scans the laser beam at a refresh rate of 60 Hz and irradiates each of the projection regions A1 to A3. In this case, each of the virtual images V1 to V3 is also displayed at a frame rate of 60 Hz. That is, the respective virtual images V1 to V3 are displayed at the same frame rate as the refresh rate of the light source 20. In this way, the image data generation unit 50 generates the image data VD, and the drive unit 60 drives the light source 20 and the screen group 30.

3A and 3B are diagrams schematically showing the arrangement configuration of the light source 20, the screen group 30, and the reflective member 40 in the display device 10. 3 (a) and 3 (b) will be used to describe a preferable arrangement relationship between the screen group 30 and the reflective member 40, and a preferable arrangement relationship between the light source 20 and the screen group 30.

As shown in FIG. 3A, the screens S1 to S3 and the reflective member 40 have outer edges of the projection regions A1 to A3 of the screens S1 to S3 as viewed from the focal point FP of the concave surface portion 41 of the reflective member 40. It is preferable that they are configured so as to overlap each other. For example, a straight line LA connecting the upper ends (ends of 1) of the projection areas A1 to A3 of the screens S1 to S3 and the lower ends (other ends) of the projection areas A1 to A3 of the screens S1 to S3. It is preferable that the intersection with the straight line LB connecting the two is aligned with the focal point FP of the concave surface portion 41 of the reflective member 40.

When the outer edges of the projection regions A1 to A3 are configured to overlap each other when viewed from the focal point FP of the reflective member 40, the sizes of the virtual images V1 to V3 can be made substantially the same. Therefore, the distortion of the superimposed virtual images V1 to V3 as a whole is suppressed, and the image quality is improved.

Further, as shown in FIG. 3B, each of the light source 20 and the screens S1 to S3 is a straight line connecting the exit portion EP of the light source 20 and the lower end portion A31 of the projection region A3 of the screen S3 closest to the reflection member 40. It is desirable that the angle θ formed by the LC and the straight line (normal line of the projection region A3) LD perpendicular to the projection region A3 is 5 ° or less. As a result, it is possible to suppress a decrease in the light intensity of the projected light L2 incident on the reflective member 40, and it is possible to suppress a decrease in the brightness of the virtual images V1 to V3.

As described above, the display device 10 is arranged in the light source 20 that emits the emitted light L1 from the emitting portion EP and irradiates the predetermined irradiation region SA with the emitted light L1 and in the irradiation region SA, and each emits the emitting portion EP. It has a plurality of screens S1 to S3 having projection areas A1 to A3 arranged at positions that do not overlap each other on a straight line including the screens, and a reflection member 40 arranged on a straight line passing through all of the projection areas A1 to A3.

Therefore, for example, it is possible to provide a display device 10 capable of displaying a high-quality image with depth by using a general light source 20 and performing simple operation control. For example, a general refresh rate (for example, 60 Hz) scanning type laser light source may be prepared as the light source 20, and screens S1 to S3 may be arranged so as not to overlap when viewed from the emission unit EP. Further, a general combiner may be arranged as the reflecting member 40 in accordance with the projection areas A1 to A3 of the screens S1 to S3. Thereby, for example, a virtual image VI with high image quality can be obtained without increasing the refresh rate of the light source 20.

Further, each of the projection regions A1 to A3 of the screens S1 to S3 is composed of a state-variable member whose state changes between a transmitted state in which the emitted light L1 from the light source 20 is transmitted and a scattered state in which the emitted light L1 is scattered. .. By arranging the projection areas A1 to A3 so as not to overlap each other when viewed from the emission unit EP, for example, it is possible to drive the projection area A1 of the screen S1 at the position farthest from the reflection member 40 so as to be in a scattered state at all times. .. Therefore, the drive control of the entire projection areas A1 to A3 is simplified.

The screens S1 to S3 (projection regions A1 to A3) are not limited to the case where each of the screens S1 to S3 is composed of a state-variable member. Specifically, by arranging the projection areas A1 to A3 so as to be offset from the light source 20, the projection area A1 of the screen S1 farthest from the reflection member 40 becomes like the projection areas A2 or A3 of the other screens S2 or S3. It does not have to consist of variable state members. For example, the projection region A1 of the screen S1 may be a simple light scattering member such as a light scattering plate.

In other words, for example, the projection region A1 of the screen S1 arranged at the position farthest from the reflection member 40 of the screens S1 to S3 is composed of a scattering member that scatters the emitted light L1 and is composed of the screens S1 to S3. Each of the projection regions A2 and A3 of the other screens S2 and S3 is composed of a state-variable member whose state changes between a transmission state in which the emitted light L1 is transmitted and a scattering state in which the emitted light L1 is scattered. You may.

By using a part of the screens S1 to S3 as a passive light scattering member, the control of the screen group 30 by the drive unit 60 is simplified as compared with the case where all the screens S1 to S3 are driven. In addition, the price of the screen group 30 can be reduced.

Further, there is a concern that the virtual image V1, which is an image projected on the screen S1 at the position farthest from the reflective member 40, has lower brightness (darker) than the other virtual images V2 or V3. However, in the design of the projection region A1 of the screen S1, it is not necessary to consider the transmission characteristics. Therefore, when considering the scattering member as the projection region A1, for example, the scattering characteristics can be given the highest priority. Therefore, it is possible to increase the brightness of the virtual image V1 (suppress the decrease in brightness).

FIG. 4A is a diagram schematically showing the configuration of the display device 10A according to the modified example of the first embodiment. The display device 10A has the same configuration as the display device 10 except for the configuration of the screen group 30A and the drive unit 60A. In this modification, the screen group 30A is composed of three screens S11, S21 and S31. The drive unit 60A generates a screen drive signal DS21 that drives each of the screens S11 to S31.

In this modification, the screens S11 to S31 are arranged so that only the projection areas A1 to A3 do not overlap when viewed from the exit portion EP of the light source 20. In this modification, the screens S11 to S31 partially overlap when viewed from the emitting portion EP, but the projection areas A1 to A3 are configured so as not to overlap as in the first embodiment.

FIG. 4B is a diagram showing a screen drive signal DS21 generated by the drive unit 60A. FIG. 4B is a timing chart showing the screen drive signal DS21 in the frame periods F1 and F2. As shown in FIG. 4B, in this modification, the drive unit 60A drives the screens S11 to S31 so that any one of the screens S11 to S31 is in the scattered state (display state).

As in this modification, when the drive control is performed so that only one of the projection regions A1 to A3 is always in the scattered state in the image cycle, the image quality of the virtual image VI is stable. For example, at the timing when an image is projected on the screen S2 with the screens S1 and S2 in a scattered state, there is a concern that a small amount of projected light L2 that has become stray light is projected on the screen S1. On the other hand, by setting all the other screens in the transmissive state at the timing when one screen is in the scattered state, it is possible to surely project the desired projected light L2 only on the screen S2.

Further, in this modification, detailed design of the shape and size of the screens S11 to S31 can be facilitated. For example, commercially available liquid crystal films are prepared as screens S11 to S31, and after the projection areas A1 to A3 are defined, the projection areas A1 to A3 are arranged at positions that do not overlap with each other when viewed from the emission unit EP of the light source 20. The screen should be arranged like this. Also in this modification, it is possible to provide a display device 10A capable of displaying a high-quality image with depth with a simple configuration and simple operation control.

In addition, for example, when each of the screens S11 to S31 has a translucent region other than the projection regions A1 to A3, for example, when the liquid crystal film is attached to the translucent plate, FIG. 2 ( The same projection operation can be performed even if it is driven in the mode shown in a).

Further, in this embodiment and its modification, a case where each projection region A1 to A3 is composed of a state-variable member in a normal mode in which a transmission state is transmitted when energized has been described. However, each projection region A1 to A3 may be a state-variable member in a reverse mode that is in a scattered state when energized. In this case, for example, the drive unit 60 or 60A has a screen drive signal (phase inverted) having a signal level opposite to that shown in FIGS. 2 (a) and 4 (b) for each of the projection regions A1 to A3. It is sufficient to supply the signal (a signal having the opposite voltage application pattern).

FIG. 5 is a diagram schematically showing the configuration of the display device 70 according to the second embodiment. The display device 70 has the same configuration as the display device 10 except for the configuration of the reflective member 80. In this embodiment, the reflecting member 80 is a reflecting mirror having a concave surface portion 81 facing each of the screens S1 to S3. The concave surface portion 81 reflects the projected light L2 toward the outside.

In this embodiment, the reflective member 80 reflects the projected light L2 from the screens S1 to S3 toward the windshield FG of the vehicle. That is, the display device 70 projects the projected light L2 onto the windshield FG by the reflecting member 80. The observer visually recognizes the virtual image VI (virtual image V1 to V3) through the windshield FG.

As described above, in this embodiment, the reflecting member 80 is a reflecting mirror having a concave surface portion 81. Therefore, for example, by making the windshield FG function as a combiner, it is possible to provide an external display type display device 70 capable of displaying a deep and high-quality image with a simple configuration and simple operation control. can.

10, 10A, 70 Display device 20 Light source EP Emission part L1 Emission light S1, S11, S2, S21, S3, S31 Screen 40, 80 Reflective member 41, 81 Concave part 60 Drive part

Claims (6)

A light source that emits emitted light from the emitting unit and irradiates the emitted light to a predetermined irradiation area.
A plurality of screens arranged within the irradiation area, each having only one projection area on a straight line passing through the emission portion so as not to overlap each other.
A reflective member arranged on a straight line passing through all of the projection regions of each of the plurality of screens and having a reflective surface reached by the emitted light passing through the projection regions of the plurality of screens.
Have,
A display device, characterized in that the projection regions are at least partially overlapped with each other in a direction perpendicular to the irradiation surface irradiated with the emitted light of the plurality of screens . A light source that emits emitted light from the emitting unit and irradiates the emitted light to a predetermined irradiation area.
A plurality of screens arranged in the irradiation area, each having a projection area at a position not overlapping with each other on a straight line passing through the exit portion.
It has a reflective member that is arranged on a straight line that passes through all of the projection regions of each of the plurality of screens and that the emitted light reaches through the projection regions of the plurality of screens.
Each of the projection regions of the plurality of screens is a display device comprising a state-variable member whose state changes between a transmitted state in which the emitted light is transmitted and a scattered state in which the emitted light is scattered. A light source that emits emitted light from the emitting unit and irradiates the emitted light to a predetermined irradiation area.
A plurality of screens arranged in the irradiation area, each having a projection area at a position not overlapping with each other on a straight line passing through the exit portion.
It has a reflective member that is arranged on a straight line that passes through all of the projection regions of each of the plurality of screens and that the emitted light reaches through the projection regions of the plurality of screens.
The projection area of one screen arranged at the position farthest from the reflection member among the plurality of screens is composed of a scattering member that scatters the emitted light.
The projection region of each of the other screens among the plurality of screens is composed of a state-variable member whose state changes between a transmitted state that transmits the emitted light and a scattered state that scatters the emitted light. Characteristic display device. The display device according to claim 2 or 3, wherein the state-variable member changes its state to the transmission state when a voltage is applied. A light source that emits emitted light from the emitting unit and irradiates the emitted light to a predetermined irradiation area.
A plurality of screens arranged in the irradiation area, each having a projection area at a position not overlapping with each other on a straight line passing through the exit portion.
It has a reflective member arranged on a straight line passing through all of the projection areas of each of the plurality of screens.
The reflective member has a concave portion that is arranged to face each of the projection regions of the plurality of screens and is reached by the emitted light that has passed through the projection regions of the plurality of screens.
A display device, wherein each of the plurality of screens is arranged so that the outer edges of the projection regions overlap each other when viewed from the focal point of the concave portion. The display according to any one of claims 1 to 5, wherein the light source is a laser light source that emits a laser beam as the emitted light and scans the laser beam with the irradiation region as a scanning region. Device.

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