Image display device capable of multi-depth expression

Abstract

The image display device comprises: a display element that forms an image by modulating light; a light transmission unit that transmits the image formed by the display element to an observer's eye and includes a focusing member; and a driving unit that drives the display element so that the position of the display element is varied, and includes a shape-variable wire, a housing that fixes both sides of the shape-variable wire, and a movable structure in which the shape-variable wire is routed and which moves the display element along a first direction in conjunction with the length variation of the shape-variable wire, and which has a tilt prevention element that prevents tilt about the axis of the first direction.

Description

Technology Field

[0001] The present disclosure relates to an image display device capable of multiple depth representations. Background Technology

[0002] 3D image display technology is being applied in various fields, and recently, it is also being applied to image devices related to virtual reality (VR) displays and augmented reality (AR) displays.

[0003] Head-mounted displays providing virtual reality (VR) have now reached the commercialization stage and are being widely applied in the entertainment industry. In addition, they are evolving into forms applicable in the medical, educational, and industrial sectors.

[0004] Augmented reality (AR) displays, an advanced form of virtual reality displays, are video devices that combine the real world and virtual reality, characterized by their ability to facilitate interaction between the two. This interaction is based on the function of providing real-time information about real-world situations, and can further enhance the effect of reality by overlaying virtual objects or information onto the real-world environment.

[0005] In such devices, stereoscopy technology is commonly used for displaying three-dimensional images, but this can lead to visual fatigue caused by a discrepancy between convergence and accommodation. Accordingly, various structures for depth representation are being sought as a method for displaying three-dimensional images that can reduce visual fatigue. The problem to be solved

[0006] The present disclosure provides an image display device capable of expressing various depths. means of solving the problem

[0007] According to one type, the device comprises: a display element that modulates light to form an image; a light transmission unit including a focusing member that transmits the image formed by the display element to an observer's eye; and a driving unit including a first actuator including a shape-variable wire, a housing that fixes both sides of the shape-variable wire, and a movable structure in which the shape-variable wire is routed and which moves the display element along a first direction in conjunction with the length variation of the shape-variable wire, and which has a tilt prevention element that prevents tilt about the axis of the first direction.

[0008] The above driving unit can move the display element in parallel so that the distance between the display element and the focusing member is varied.

[0009] The above-described movable structure may include: a movable plate on which the display element is seated; a fixed plate fixed to the housing; and a tilt prevention element disposed between the movable plate and the fixed plate, which elastically supports the movement of the movable plate relative to the fixed plate.

[0010] The above-mentioned tilt prevention element may include two elastic structures that are respectively provided on one side of the movable plate and on the other side facing the one side, and are arranged symmetrically at 180° rotation with respect to the center of the movable plate.

[0011] The two elastic structures mentioned above may each have a 4-bar linkage structure.

[0012] Each of the two elastic structures may include an intermediate plate, two lower link bars connecting the intermediate plate and the fixed plate, and two upper link bars connecting the intermediate plate and the movable plate.

[0013] Two routing through holes are provided in the center of the above-mentioned movable plate, and the shape-variable wire can be arranged to be connected to the other side of the housing by passing through the two routing through holes in sequence from one side of the housing.

[0014] Each of the two sides of the above housing is provided with a fixing through hole, and the shape-variable wire can be fixed by passing through the fixing through hole.

[0015] The above housing may further be provided with a post positioned facing the fixing through hole, and the shape-variable wire may be positioned to wrap around the post one or more times and then pass through the through hole.

[0016] The shape variable wire may include a first shape variable wire connecting one side of the intermediate plate and the fixed plate, and a second shape variable wire arranged symmetrically with respect to the first shape variable wire at 180° rotation.

[0017] The lower link bar may have a connection portion adjacent to the intermediate plate and a connection portion adjacent to the fixed plate that is narrower than other parts, and the upper link bar may have a connection portion adjacent to the intermediate plate and a connection portion adjacent to the movable plate that is narrower than other parts.

[0018] The above-mentioned movable structure may have an integral structure processed from a single metal sheet.

[0019] The above-described image display device may include buckling structures disposed on both sides of the movable plate to support the positional change state of the movable plate.

[0020] The above housing includes two side walls fixed to both sides of the shape-variable wire and a bottom surface fixed to the fixing plate, and the buckling structure may be in the shape of a strip with both ends elastically connected to one side of the movable plate and the side wall of the housing.

[0021] The above buckling structure may be configured such that the movable plate is in a stable state at a predetermined distance of two positions relative to the fixed plate, and an elastic coupling state between the side wall and one side of the movable plate may be established.

[0022] The above-described image display device is disposed between the movable plate and the bottom surface of the housing to provide driving force to the movable plate, and may include a second actuator comprising a first elastic bridge having a curved surface convexly curved toward the movable plate, a second elastic bridge having a curved surface convexly curved toward the bottom surface, and a second shape variable wire fixed between both ends of the first elastic bridge and both ends of the second elastic bridge.

[0023] The first elastic bridge has an elastic restoring force in the direction in which the radius of curvature increases, and the center of the first elastic bridge can be fixed to the movable plate.

[0024] The second elastic bridge has an elastic restoring force in the direction in which the radius of curvature increases, and the center of the second elastic bridge can be fixed to the bottom surface of the housing.

[0025] The second actuator above provides a driving force that moves the movable plate away from the fixed plate, and the first actuator can provide a driving force that moves the movable plate closer to the fixed plate.

[0026] When the length of the second shape variable wire is shortened, the movable plate moves away from the fixed plate, and when the length of the first shape variable wire is shortened, the movable plate can move closer to the fixed plate.

[0027] Power can be applied to the first actuator and the second actuator, respectively, only while the lengths of the first shape variable wire and the second shape variable wire are changing.

[0028] The above shape-changing wire may be made of a material whose shape changes by heat.

[0029] The above shape-variable wire may include a shape memory alloy or an electro-active polymer.

[0030] The light transmission unit can transmit the image formed in the display element to the observer's eye as an enlarged image on a virtual image plane at a predetermined location.

[0031] The above image information includes depth information linked to the position of the virtual plane for each of the images of multiple frames, and the processor can generate the driving signal according to the depth information.

[0032] The light transmission unit above has a first light, which is an image from the display element, and

[0033] A second light from the real environment in front of the observer can be combined and transmitted to the observer's eye.

[0034] The light transmission unit may include a beam splitter positioned obliquely with respect to the propagation path of the first light and the propagation path of the second light; and the focusing member.

[0035] The above display element includes a first display element and a second display element, and the driving unit includes first and second driving units that drive the first display element and the second display element, respectively, so that the positions of the first display element and the second display element are variable, and the light transmission unit may include a first light transmission unit and a second light transmission unit that transmit an image formed in the first display element and the second display element to the left and right eyes of an observer, respectively.

[0036] The above image information includes information for a pair of left eye images and right eye images to be perceived as a three-dimensional image of one frame, and the processor can control the first display element and the second display element so that the left eye image is formed in the first display element and the right eye image is formed in the second display element. Effects of the invention

[0037] According to the above-described image display device, a wide range of depth expression is possible with a compact structure, and tilting of the image does not occur when the display device is driven.

[0038] The above-described image display device can provide a three-dimensional image that combines a binocular parallax method and depth representation.

[0039] The above-described image display device is easy to apply to wearable devices, and can be applied, for example, to glasses-type augmented reality display devices. Brief explanation of the drawing

[0040] FIG. 1 is a drawing showing the configuration and optical arrangement of an image display device according to an embodiment. FIG. 2 is a diagram conceptually showing the schematic configuration and operation of a driving unit provided in the image display device of FIG. 1. FIGS. 3A and FIGS. 3B are block diagrams showing examples of processors that can be employed in the image display device of FIG. 1. FIGS. 4 and FIGS. 5 are a cross-sectional view and a perspective view, respectively, showing an exemplary detailed configuration of a driving unit provided in the image display device of FIG. 1. FIGS. 6a to 6c are drawings that schematically describe the manufacturing process along with the detailed components of the driving unit provided in the image display device of FIG. 1. FIGS. 7 and 8 exemplarily show the structure of the driving unit in the image display device of FIG. 1, along with the change in the position of the display element and the upper surface according to the driving of the driving unit. FIG. 9 is a perspective view showing a schematic configuration of a driving unit that may be provided in an image display device according to another embodiment. Figures 10 and 11 are a cross-sectional view and a plan view of Figure 9, respectively. FIG. 12 is a perspective view showing a schematic configuration of a driving unit that may be provided in an image display device according to another embodiment. Figures 13 and 14 are a cross-sectional view and a plan view of Figure 12, respectively. FIG. 15 is a perspective view showing the schematic configuration of a driving unit that may be provided in an image display device according to another embodiment. Fig. 16 is a plan view of Fig. 15. Fig. 17 is a cross-sectional view of AA for Fig. 16. FIGS. 18a to 18c are drawings illustrating the detailed configuration of FIG. 15 and the process of combining them. FIGS. 19a and FIGS. 19b are a cross-sectional view and a side view showing the second driving state of the driving unit of FIG. 15. FIG. 20 shows the configuration and optical arrangement of an image display device according to another embodiment. Specific details for implementing the invention

[0041] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. In the following drawings, the same reference numerals refer to the same components, and the size of each component in the drawings may be exaggerated for clarity and convenience of explanation. Meanwhile, the embodiments described below are merely illustrative, and various modifications are possible from these embodiments.

[0042] In the following, terms described as "upper" or "upper" may include not only those directly above in contact, but also those above without contact.

[0043] A singular expression includes a plural expression unless the context clearly indicates otherwise. Furthermore, when a part is said to "include" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0044] The use of the term “above” and similar descriptive terms may apply to both the singular and plural.

[0045] Unless there is an explicit description of the order of the steps constituting the method or a description contrary to it, said steps may be performed in a suitable order. It is not necessarily limited to the order in which said steps are described. The use of all examples or exemplary terms (e.g., etc.) is merely intended to explain the technical concept in detail and, unless limited by the claims, the scope is not limited by said examples or exemplary terms.

[0046] FIG. 1 is a diagram showing the configuration and optical arrangement of an image display device according to an embodiment, FIG. 2 is a diagram conceptually showing the schematic configuration and operation of a driving unit provided in the image display device of FIG. 1, and FIG. 3a and FIG. 3b are block diagrams showing examples of processors that can be employed in the image display device of FIG. 1.

[0047] The image display device (1000) includes a display element (100) that forms an image by modulating light, a light transmission unit (300) that transmits the image formed by the display element (100) to an observer's eye, a driving unit (200) that drives the display element (100) so that the position of the display element (100) is variable, and a processor (400) that controls the display element (100) and the driving unit (200) according to image information.

[0048] The display element (100) forms an image by modulating light according to image information for an image to be provided to an observer. The image formed by the display element (100) can be provided to both eyes of the observer, and for convenience, only an optical system facing a single eye is shown in the drawing. The image formed by the display element (100) may be, for example, a stereo image provided to the left and right eyes of the observer, a hologram image, a light field image, an IP (integral photography) image, etc., and may also include a multi-view or super multi-view type image. Furthermore, it is not limited thereto and may be a general two-dimensional image.

[0049] The display element (100) may include, for example, an LCoS (liquid crystal on silicon) element, an LCD (liquid crystal display) element, an OLED (organic light emitting diode) display element, a DMD (digital micromirror device), and may also include next-generation display elements such as Micro LED, QD (quantum dot) LED.

[0050] Although not shown in the image display device (1000), a light source for providing light for image formation to the display element (100) may be provided, and additionally, a beam splitter for controlling the light path, a relay lens for magnifying and reducing the image, and a spatial filter for noise removal may be further provided.

[0051] The light transmission unit (300) changes the path of an image formed in the display element (100), forms an image of a size suitable for the observer's field of view, and transmits it to the observer's eye. The light transmission unit (300) may include a focusing member (310) and may also include a beam splitter (330) as a member that branches the light and changes its path.

[0052] The focusing member (310) is an image forming member having refractive power and can enlarge or reduce an image formed in the display element (100). The focusing member (310) is illustrated as a concave mirror, but is not limited thereto. The focusing member (310) may have a form in which a convex lens, a concave lens, etc., are combined with a concave mirror.

[0053] The beam splitter (330) may be a half mirror that transmits half of the incident light and reflects the other half. However, it is not limited to this and may be a polarizing beam splitter that transmits or reflects the incident light depending on the polarization. If the beam splitter (330) is a polarizing beam splitter, additional optical elements for polarization conversion may be further provided in the light transmission unit (300).

[0054] As described, the focusing member (310) and the beam splitter (330) are fixed through a transparent light guide member (350), so that the light transmission member (300) may have an integrated structure. However, this is exemplary and is not limited thereto.

[0055] The light transmission unit (300) not only transmits light containing an image formed by the display element (100) to the observer's eyes, but also, together with this, transmits light containing a real environment image in front of the observer to the user's eyes. Accordingly, the image display device (1000) can function as a see-through type display.

[0056] The light transmission unit (300) is not limited to the illustrated shape and configuration. Additional optical elements may be provided to transmit an image formed in the display element (100) to the observer's pupil along with a real environment image in front of the observer, and optical windows of various shapes and structures may be employed.

[0057] The light of the image formed in the display element (100) passes through the beam splitter (310), is reflected by the focusing member (310), and then reaches the observer's eye through a path that is reflected back from the beam splitter (310). In this path, the observer perceives a virtual image formed on a virtual image plane (VP) at a predetermined position behind the beam splitter (310), and the sense of depth felt by the observer varies depending on the position of the virtual image plane (VP).

[0058] The image display device (1000) according to the embodiment can change the position of the virtual plane (VP) by reflecting the depth of the image to be displayed, rather than fixing the position of the virtual plane (VP) to a single value. To this end, the image display device (1000) is equipped with a driving unit (200) for driving the position of the display element (100). The driving unit (200) can move the display element (100) in parallel so that the distance from the focusing member (310) varies. When the position of the display element (100) varies along the A1 direction, the position of the virtual plane (VP) varies along the A2 direction.

[0059] The driving unit (200) employed in the image display device (1000) employs a shape-variable material to widen the position driving range of the display element (100) with the smallest possible volume, and also employs a configuration that prevents tilting about the axis of the A1 direction as much as possible when the position of the display element (100) is varied along the A1 direction.

[0060] As illustrated in FIG. 2, the driving unit (200) includes an actuator including a shape-variable wire (220), a housing (210) that fixes both sides of the shape-variable wire (220), and a movable structure (290) that transmits a driving force according to the deformation of the shape-variable wire (220) to a display element (100).

[0061] The movable structure (290) is a structure in which a display element (100) is mounted and a shape-variable wire (220) is routed, and it transmits driving force and restoring force according to the length variation of the shape-variable wire (220) to the display element (100), while having a tilt prevention element that prevents tilt from occurring with respect to the axis of the intended operating direction, i.e., the A1 direction.

[0062] The shape-changing wire (220) may be made of a material whose shape changes by heat, and such material may include a shape memory alloy or an electro-active polymer.

[0063] An exemplary detailed configuration of a driving unit (200) equipped with a tilt prevention element and an operation to vary the position of a display element (100) will be described later with reference to FIGS. 4 to 8.

[0064] The processor (400) can generate an optical modulation signal (SG1) to be transmitted to a display element (100) and a driving signal (SG2) to be transmitted to a driving unit (200) according to image information related to an image to be perceived by an observer. The display element (100) and the driving unit (200) are each controlled by the generated optical modulation signal (SG1) and driving signal (SG2). That is, an image is formed in the display element (100) by the optical modulation signal (SG1), and the position of the display element (100) is driven so that a virtual plane (VP) set appropriately for this image is located.

[0065] The image display device (1000) also includes a memory (500), and the memory (500) may store various data and program codes necessary for operating the image display device (500), including image information.

[0066] Referring to FIG. 3a, the processor (400) may include an optical modulation signal generation unit (410) and a driving signal generation unit (480). By referring to image information, an optical modulation signal (SG1) is generated in the optical modulation signal generation unit (410), and a driving signal (SG2) is generated in the driving signal generation unit (480).

[0067] For each of the multiple frames of images to be provided to an observer, the image information includes pixel-specific data related to the color values ​​of multiple pixels, and together with this, may include depth information linked to the position of the virtual plane (VP) where each image is imaged.

[0068] The depth information included in the image information may be a predetermined representative depth value for each of the multiple frames of the image. Such depth values ​​may be set to one or more.

[0069] The representative depth can be pre-set from a saliency map. Saliency map analysis can be performed to select areas likely to be focused on by an observer, in other words, areas of high visual concentration. Brightness, color, contours, and object size may be considered to select areas of high visual concentration. For example, areas with a significant difference in brightness or color compared to the surroundings, areas with strong contour features, or areas with large objects can be areas of high visual concentration. The depth value corresponding to these areas can be selected as the representative depth. Alternatively, locations of high visual concentration may be selected based on the content contained in the image.

[0070] In addition, a representative depth may be established by analyzing the depth map and color map of the image, for example, based on frequency by depth. Alternatively, the representative depth may be established through Zone of Comfort (ZOC) analysis that considers human visual perception characteristics.

[0071] The representative depth set in this manner may be a continuous value, but it may also be a plurality of discrete values. That is, rather than using all the values ​​required for depth expression, the representative depth may be set from among discrete values ​​obtained by quantizing these values ​​at predetermined intervals. When quantizing the depth values, the range of variation of the representative depth value selected in consecutive frames can be reduced when selecting a representative depth value for every frame for video expression. Accordingly, the range of variation of the position of the display element (100) by the driving unit (200) can be reduced, and also, when changing the position of the virtual plane (VP) to correspond to the representative depth, the driving signal (SG2) applied to the driving unit (200) can also be quantized, and driving can be made easier. When the same representative depth value is selected in consecutive frames, position driving of the display element (100) is not required, so the driving of the video display device (1000) can be simplified.

[0072] The optical modulation signal generation unit (410) can generate an electrical signal that implements a predetermined color value as an optical modulation signal (SG1) by referring to pixel-by-pixel data included in the image information.

[0073] The driving signal generating unit (480) can generate a driving signal (SG2) that causes the display element (100) to be moved to a position so that a virtual plane (VP) is formed at a position corresponding to a set representative depth value by referring to depth information. The driving signal (SG2) may be, for example, an electrical signal that generates appropriate heat for deformation of a shape-variable wire (220) provided in the driving unit (200).

[0074] The light modulation signal (SG1) and the driving signal (SG2) are transmitted to the display element (100) and the driving unit (200), respectively, so that the corresponding image can be perceived by an observer from the position of the changed virtual plane (VP).

[0075] The driving signal (SG2) for driving the driving unit (200) may be transmitted with a delay of a predetermined time compared to the optical modulation signal (SG1). The predetermined time may be set to be longer than the vergence-accommodation time of the observer's eye. This takes into account the time required for the human eye to perceive the image of a changed depth position.

[0076] Referring to FIG. 3b, the processor (401) may further include a representative depth extraction unit (430) together with an optical modulation signal generation unit (410) and a driving signal generation unit (480).

[0077] In the description of FIG. 3a, the image information is described as including preset depth information, but is not limited thereto, and the processor (401) may include a representative depth extraction unit (430). That is, the processor (401) extracts a representative depth for each image by referring to pixel-by-pixel data included in the image information and reflects it back into the image information. By referring to this, the driving signal generation unit (480) may generate a driving signal (SG2).

[0078] FIGS. 4 and FIGS. 5 are a cross-sectional view and a perspective view, respectively, showing an exemplary detailed configuration of a driving unit provided in the image display device of FIG. 1.

[0079] Referring to the drawings, the driving unit (200) includes a shape-variable wire (220), a housing (210) that fixes both sides of the shape-variable wire (220), and a movable structure (290) through which the shape-variable wire (220) is routed and which operates a display element (100) in conjunction with the length variation of the shape-variable wire (220).

[0080] A height (H) between the movable plate (270) and the fixed plate (230) can be formed by the routing pattern of the shape-variable wire (220), and this height (H) can be changed and adjusted by the movable plate (270) moving relative to the fixed plate (230) according to the length variation of the shape-variable wire (220). By this movement, the position of the display element (100) can be varied along the A1 direction.

[0081] The movable structure (290) includes a fixed plate (230) fixed to the housing (210), a movable plate (270) on which a display element is seated, and a tilt prevention element disposed between the fixed plate (230) and the movable plate (270) to elastically support the movement of the movable plate (270) relative to the fixed plate (230).

[0082] The tilt prevention element is provided so that the display element (100) does not tilt with respect to the axis of the A1 direction when the display element (100) is moved along the A1 direction according to the movement of the movable plate (270), and includes two elastic structures (250) provided on one side of the movable plate (270) and on the other side facing said one side, and arranged symmetrically with respect to the center of the movable plate (270) at a 180° rotation.

[0083] Each of the two elastic structures (250) may have a 4-bar linkage structure. For example, as illustrated, each of the two elastic structures (250) includes an intermediate plate (MP), two lower link bars (B1, B2) connecting the intermediate plate (MP) and the fixed plate (230), and two upper link bars (B3, B4) connecting the intermediate plate (MP) and the movable plate (270).

[0084] Two routing through holes are provided in the center of the movable plate (270), and the shape-variable wire (220) can be arranged to be connected to the other side of the housing (210) by passing through the two routing through holes in sequence from one side of the housing (210). At this time, fixing through holes are provided on each side of the housing (210), and the shape-variable wire (220) can be fixed by passing through the fixing through holes with a crimp (not shown). However, such a fixing method is exemplary and is not limited thereto.

[0085] With reference to FIGS. 6a to 6c, the manufacturing process along with the detailed components of the driving unit will be described in a schematic manner.

[0086] Referring to FIG. 6a, the housing (210) is formed with a flat plate and two walls formed on both sides thereof, and the walls on both sides are provided with fixing through holes (H1) (H2). Bolts (28) for connecting a movable structure (290) may be provided at the four corners of the flat plate.

[0087] Referring to FIG. 6b, the movable structure (290) may have an integral structure formed from a single plate, for example, a metal sheet (20).

[0088] Pattern holes (23) may be formed in the metal sheet (20) to form shapes corresponding to a movable plate (270), a fixed plate (230), and two elastic structures (250). The formation of these pattern holes (23) may be performed using a laser. In addition, bolt holes (27) may be formed in the metal sheet (20) for coupling with a bolt (29) of a housing (210).

[0089] When looking at the shape of the intermediate plate (MP) constituting the elastic structure (250), the two lower link bars (B1, B2) connecting the intermediate plate (MP) and the fixed plate (230), and the two upper link bars (B3, B4) connecting the intermediate plate (MP) and the movable plate (270), the lower link bars (B1, B2) have a narrower width at the connection portion adjacent to the intermediate plate (MP) and the connection portion adjacent to the fixed plate (230) than at other portions, and similarly, the upper link bars (B3, B4) have a narrower width at the connection portion adjacent to the intermediate plate (MP) and the connection portion adjacent to the movable plate (270) than at other portions. These areas are indicated by point circles (JR), and although only one is shown in the drawing for convenience, there are a total of eight areas, and these areas serve as joints for elastic driving of the movable structure (290).

[0090] Next, looking at FIG. 6c, the movable structure (290) of FIG. 6b can be coupled to the housing (210) of FIG. 6a. At this time, a shape-variable wire (220) is coupled from a through hole (H1) on one side of the housing (220) through two through holes (H3) and (H4) in the center of the movable plate (270) to a through hole (H2) on the other side of the housing (220).

[0091] When such a combination is made, the movable plate (270) is lifted upward and the length of the shape-variable wire (220) is appropriately adjusted, so that a height (H) can be formed between the movable plate (270) and the fixed plate (230) by the shape-variable wire (220) as shown in FIG. 4. This height (H) can be adjusted by the movement of the movable plate (270) moving toward the fixed plate (230) when the shape-variable wire (220) is retracted.

[0092] The movable structure (290) according to the described manufacturing method and resulting structure has a very light weight and is a rigid structure capable of repeated driving, and is equipped with a structure capable of accurate up-and-down movement.

[0093] The detailed shape of the movable structure (290) is illustrated as having two elastic structures (250) that symmetrically elastically support both sides of the movable plate (270) with respect to the fixed plate (230) in a 4-bar linkage shape, but is not limited to the illustrated shape. For example, the detailed shape of the elastic structures (250) can be changed to other shapes capable of implementing a 4-bar linkage structure. Additionally, the detailed shapes of the movable plate (270) and the fixed plate (230) can also be changed according to the shape of the elastic structures (250).

[0094] FIGS. 7 and 8 exemplarily show the structure of the driving unit in the image display device of FIG. 1, along with the change in the position of the display element and the upper surface according to the driving of the driving unit.

[0095] Referring to FIG. 7, in an initial state where no electrical signal is applied to the driving unit (200), specifically the shape-variable wire (220), the display element (100) is at a distance d from the focusing member (310). o It can be spaced apart by such a distance, and the optical path distance from the focusing member (310) to the virtual plane (VP) is d i It can be.

[0096] Referring to FIG. 8, an electrical signal, for example, current, is applied to the shape-variable wire (220), and the temperature of the shape-variable wire (220) increases, and the length of the shape-variable wire (220) can be reduced. The degree of change in the length of the shape-variable wire (220) can be controlled according to the applied electrical signal.

[0097] When the length of the shape-variable wire (220) shortens, the movable plate (270) moves toward the fixed plate (230), and the distance between the display element (100) and the focusing member (310) is d o It becomes longer, and the distance between the virtual plane (VP) and the focusing member (310) is d i It can be extended to '

[0098] Referring again to FIG. 7, if no electrical signal is applied to the shape-variable wire (220) again, the temperature of the shape-variable wire (220) decreases and its length can be increased again. Accordingly, the movable plate (270) moves away from the fixed plate (230). The distance between the display element (100) and the focusing member (310) is shortened again to do, and the distance between the virtual plane (VP) and the focusing member (310) is d i It can be shortened again. At this time, tilting of the movable plate (270) is prevented by two elastic structures (250) symmetrically provided on both sides between the movable plate (270) and the fixed plate (230), and thus tilting of the display element (100) can also be prevented.

[0099] FIG. 9 is a perspective view showing a schematic configuration of a driving unit that may be provided in an image display device according to another embodiment, and FIG. 10 and FIG. 11 are a cross-sectional view and a plan view, respectively, of FIG. 9.

[0100] The driving unit (201) of the present embodiment differs from the driving unit (200) described in FIGS. 4 to 8 in that the shape-variable wire has a routing form in which it passes from the housing (210) through the intermediate plate (MP). The shape-variable wire (220) includes a first shape-variable wire (221) connecting one side of the intermediate plate (MP) and the fixed plate (230), and a second shape-variable wire (222) located diagonally opposite to the first shape-variable wire (221). The second shape-variable wire (222) is arranged symmetrically with respect to the center of the movable plate (270) at a 180° rotation.

[0101] When routing the shape-variable wire (221)(222) to the movable structure (290) in this manner, the length of the shape-variable wire (221)(222) can be reduced. As the length of the shape-variable wire (221)(222) is shortened, the power required to drive it can be reduced.

[0102] FIG. 12 is a perspective view showing a schematic configuration of a driving unit that may be provided in an image display device according to another embodiment, and FIG. 13 and FIG. 14 are a cross-sectional view and a plan view, respectively, of FIG. 12.

[0103] The driving unit (202) of the present embodiment is identical to the driving unit (200) described in FIGS. 4 to 8 in that the shape-variable wire (225) has a routing form that passes from the housing (210) through the movable plate (270), and differs from the driving unit (200) in that it is provided in a coil form so that the length of the shape-variable wire (225) is extended.

[0104] The housing (210) is further provided with a post (PO) positioned facing a fixing through hole (H1), and a shape-variable wire (225) is fixed by wrapping around the post (PO) at least once and then passing through the fixing through hole (H1).

[0105] When routing the shape-variable wire (225) to the movable structure (290) in this manner, the length variation range of the shape-variable wire (220) can be increased, so the driving range in the A1 direction can be widened.

[0106] As described above, the driving unit (200)(201)(202) that can be provided in the image display device (1000) according to the embodiment employs a shape-changing material, so that the position driving range of the display element (100) can be wide while having a small volume. The driving range of the display element (100) may be within about 1 mm. When such a driving range is implemented, for example, with a voice coil motor or a piezo actuator, the volume increase is very large, whereas in the case of the embodiment, it can be implemented with a smaller volume than these. In addition, the driving unit (200)(201)(202) employs a structure that prevents tilting of the display element (100) in addition to driving in the depth direction when transmitting driving force according to the shape change of the shape-changing material to the display element (100), so that a multi-depth image without tilting of the image can be provided.

[0107] FIG. 15 is a perspective view showing a schematic configuration of a driving unit that may be provided in an image display device according to another embodiment, FIG. 16 is a plan view of FIG. 15, and FIG. 17 is a cross-sectional view AA of FIG. 16.

[0108] The driving unit (205) according to the present embodiment is similar to the previously described embodiments in that the movable structure (295) comprises a first actuator including a first shape variable wire (227), a fixed plate (235), a movable plate (270), and an elastic structure (250) which is a tilt prevention element, and additionally differs in that buckling structures (275) are formed on both sides of the movable plate (270). In addition, a second actuator (50) that provides additional driving force for the movement of the movable plate (270) may be further provided between the movable plate (270) and the bottom surface of the housing (215).

[0109] The buckling structure (275) supports the positional change state of the movable plate (270). That is, it is intended to maintain the movable plate (270) in a stable state relative to the fixed plate (235). The buckling structure (275) may be in the shape of a strip extending from one side of the movable plate (270) as illustrated. Both ends of the buckling structure (275) are connected to one side of the movable plate (270) and the side wall of the adjacent housing (215). The buckling structure (275) may be set to have an elastic connection state with the side wall of the housing (215) and one side of the movable plate (270) so that it maintains a stable state in the changed position when the movable plate (270) has a predetermined distance position relative to the fixed plate (235). The connecting part (275a) connecting the one side of the movable plate (270) and the buckling structure (275) may include a connecting groove formed into the one side of the movable plate (270). Additionally, the connecting portion (275b) where the buckling structure (275) and the side wall of the housing (215) are connected may also include a connecting groove (not shown). The stable state of the buckling structure (275) can be set according to the number and detailed shape of these connecting grooves and the material of the buckling structure (275). In an embodiment, the buckling structure (275) may have two stable states corresponding to two positions of the movable plate (270).

[0110] Referring to FIG. 17, the detailed configuration of the second actuator (50) is as follows.

[0111] The second actuator (50) includes a first elastic bridge (51) having a curved surface that is convexly curved toward the direction of the movable plate (270), a second elastic bridge (52) having a curved surface that is convexly curved toward the direction of the bottom surface of the housing (215), and a second shape variable wire (53) having a variable length that is fixed between both ends of the first elastic bridge (51) and both ends of the second elastic bridge (52).

[0112] The first elastic bridge (51) and the second elastic bridge (52) may be made of a plate-shaped material having elasticity, such as metal or plastic. Since both ends of the first elastic bridge (51) and both ends of the second elastic bridge (52) are each fixed to a second shape variable wire (53) that is shorter than the length of the first elastic bridge (51) and the length of the second elastic bridge (52), the first elastic bridge (51) and the second elastic bridge (52) may be bent by the second shape variable wire (53) to form an arch shape. Accordingly, the first elastic bridge (51) and the second elastic bridge (52) have an elastic restoring force in the direction in which the radius of curvature increases. The convex center of the first elastic bridge (51) may be fixed to the lower surface of the movable plate (270), for example, using a fixed plate (54). Additionally, the convex center of the second elastic bridge (52) can be fixed to the inner bottom surface of the housing (215) using, for example, a fixing plate (55). Then, when the first elastic bridge (51) and the second elastic bridge (52) are elastically deformed, the convex center of the first elastic bridge (51) does not slide against the lower surface of the movable plate (270), and the convex center of the second elastic bridge (52) does not slide against the bottom surface of the housing (215).

[0113] The second shape variable wire (53), like the first shape variable wire (227), can be configured to change in length by electrical control and may include a material such as a shape memory alloy (SMA) or an electro-active polymer, for example, in which the shape can change to a predetermined shape upon a specific driving signal. The shape memory alloy may include, for example, a nickel-titanium (Ni-Ti) alloy, a copper-zinc (Cu-Zn) alloy, a gold-cadmium (Au-Cd) alloy, an indium-titanium (In-Ti) alloy, etc. In this case, when a driving voltage is applied to the second shape variable wire (53), heat is generated in the second shape variable wire (53), and shrinkage deformation of the second shape variable wire (53) may occur due to the heat. Additionally, if no driving voltage is applied to the second shape variable wire (53), the second shape variable wire (53) may extend to its original length.

[0114] FIGS. 18a to 18c are drawings that exemplarily show the detailed configuration of FIG. 15 and the process of combining them.

[0115] Referring to FIG. 18a, the housing (215) is formed with a flat plate and two side walls formed on both sides thereof, and the two side walls are provided with fixing through holes (H1) (H2). Bolts (28) for connecting a movable structure (295) may be provided at the two corners of the flat plate.

[0116] Referring to FIG. 18b, the fixed plate (235), elastic structure (250), movable plate (270) and buckling structure (275) may have an integral structure formed from a single plate, for example, a metal sheet (21).

[0117] The metal sheet (21) can be patterned in a shape corresponding to the movable plate (270), elastic structure (250), fixed plate (235), and buckling structure (275), and a detailed pattern for forming the elastic structure (250) and a detailed pattern of the connecting part (275a) for setting the connection form with the buckling structure (275) can be created. A bolt hole (26) for connecting with the bolt (28) of the housing (215) can be formed.

[0118] Next, looking at FIG. 18c, the structure of FIG. 18b is coupled to the housing (215) of FIG. 18a, and at this time, the first shape variable wire (227) is coupled from the through hole (H1) on one side of the housing (215) through the two through holes (H3) (H4) in the center of the movable plate (270) to the through hole (H2) on the other side of the housing (220). In addition, as shown in FIG. 17, a second actuator (50) is coupled between the lower part of the movable plate (270) and the bottom surface of the housing (215). FIG. 18c is a side view of the driving unit (205), and the illustration of the second actuator (50) located in the center is omitted to show the shape of the elastic structure (250) in detail.

[0119] When such a combination is made, by lifting the movable plate (270) upward and appropriately adjusting the length of the first shape variable wire (227), a height (h1) can be formed between the bottom surface of the housing (215) and the movable plate (270) by the first shape variable wire (227). This height (h1) can be adjusted by the movement of the movable plate (270) toward the fixed plate (235) when the first shape variable wire (227) is retracted.

[0120] FIGS. 17 and FIGS. 18c represent a first driving state in which the position of the movable plate (270) is set to a height h1, resulting from the application of an electrical signal that contracts the length of the first shape variable wire (227). The length of the second shape variable wire (53) is in an initial state where it is not contracted. After forming this state by contracting the length of the first shape variable wire (227), the buckling structure (275) has a stable state that is bent downward as illustrated, and the position of the movable plate (270) is maintained by the buckling structure (275). That is, after the height h1 is set, this state can be maintained even after the first shape variable wire (227) is not subjected to an electrical signal and the length of the first shape variable wire (227) returns to its original state. In other words, there is no additional power consumption to maintain the height h1.

[0121] The second actuator (50) is operated to drive the position of the movable plate (270) away from the fixed plate (235).

[0122] FIGS. 19a and FIGS. 19b are a cross-sectional view and a side view showing the second driving state of the driving unit of FIG. 15.

[0123] An electrical signal is applied to the second shape variable wire (53), and the second shape variable wire (53) contracts, and both ends of the first elastic bridge (51) are pulled closer to each other, and both ends of the second elastic bridge (52) are also pulled closer to each other. That is, due to the contracting force of the second shape variable wire (53), the radius of curvature of the first elastic bridge (51) and the radius of curvature of the second elastic bridge (52) become smaller. Accordingly, the movable plate (270) receives a force in a direction away from the fixed plate (235), and the height of the movable plate (270) from the bottom surface of the housing (215) changes to h2.

[0124] In this second driving state, the buckling structure (275) has a stable state that is curved upward as illustrated, and the position of the movable plate (270) is maintained by the buckling structure (275). That is, after the height h2 is set, even if no electrical signal is applied to the second shape variable wire (53), the position of the movable plate (270) coupled thereto can be maintained according to the stable state of the buckling structure (275). In other words, there is no additional power consumption to maintain the height h2.

[0125] In this way, power is applied to the first actuator and the second actuator provided in the driving unit (205) only while the lengths of the first shape variable wire (227) and the second shape variable wire (53), respectively, are changing; in other words, power is consumed only while the position of the display element (100 in FIG. 1) placed on the movable plate (270) is changed. Since the position of the display element is fixed using the buckling structure (275) while the depth of the image is maintained, no power is consumed. Therefore, according to the present embodiment, power consumption of the display device (100) can be reduced while the depth is maintained.

[0126] FIG. 20 shows the configuration and optical arrangement of an image display device according to another embodiment.

[0127] The image display device (2000) may include a first display element (160), a first driving unit (170), a first light transmission unit (360), a second display element (260), a second driving unit (270), and a second light transmission unit (370).

[0128] The first driving unit (260) and the second driving unit (270) each drive the position of the first display element (160) and the second display element (170), and the first light transmission unit (360) and the second light transmission unit (370) each transmit the image formed in the first display element (160) and the second display element (170) to the observer's left eye and right eye.

[0129] The image display device (2000) also includes a processor (800) and a memory (700), and the processor (800) controls a first display element (160), a second display element (170), a first driving unit (260), and a second driving unit (270) according to image information stored in the memory (700). The processor (800) may include an optical modulation signal generating unit (810) and a driving signal generating unit (880), and program code for the execution of these may be stored in the memory (700).

[0130] The image information stored in the memory (700) may include information on a pair of left-eye images and right-eye images that can be perceived as a three-dimensional image of one frame. The left-eye image and the right-eye image have a certain disparity. The processor (800) generates light modulation signals (SG1_L) (SG1_R) so that the left-eye image is formed in the first display element (160) and the right-eye image is formed in the second display element (170), and controls the first display element (160) and the second display element (170) accordingly.

[0131] The above image information may also further include depth information linked to the location of the virtual plane (VP) where the left eye image and the right eye image are each to be imaged, and the processor (800) generates driving signals (SG2_L) (SG2_R) according to the depth information, that is, so that the virtual plane (VP) is formed at the set depth location, and controls the first driving unit (260) and the second driving unit (270). This depth information may be pre-set for the image of each frame and stored in the memory (700), or the depth information set according to the execution of the representative depth extraction unit provided in the processor (800) may be reflected in the image information.

[0132] Any one of the aforementioned driving units (200)(201)(202) or a modified structure may be employed, in which a tilt prevention element is provided in the first driving unit (260) and the second driving unit (270) to provide depth change without tilting of the image.

[0133] The image display device (2000) according to the embodiment can express a three-dimensional image by combining a binocular parallax method and a depth representation. For an image containing an object at a predetermined depth position, the vergence accommodation conflict (VAC) can be reduced by adjusting the position of the virtual plane (VP) where the image is imaged accordingly. In addition, for an image in which objects exist at various depth positions, the virtual plane (VP) can be formed with the depth position of the scanned object determined according to the salience map as the representative depth position, and the remaining depth sense can be expressed by binocular parallax so that the three-dimensional image can be perceived.

[0134] The above-described image display device (1000) (2000) may be configured in a wearable form. All or part of the components of the image display devices may be configured in a wearable form.

[0135] For example, the image display device (1000) (2000) may be applied in the form of a head-mounted display (HMD). In addition, it is not limited thereto and may be applied as a glasses-type display or a goggle-type display.

[0136] The above-described image display device (1000) (2000) can be applied to implement augmented reality (AR) in that it can show an image formed on a display element and an image of the real world to an observer together.

[0137] Augmented Reality (AR) can further enhance the effect of reality by combining and displaying virtual objects or information overlaid on the real-world environment. For example, at the observer's location, an image forming unit can generate additional information about the environment provided by the real world and present it to the observer. Such augmented reality (AR) displays can be applied to ubiquitous environments or Internet of Things (IoT) environments.

[0138] Images of the real world are not limited to real environments and, for example, may be images formed by other video devices. Therefore, the aforementioned image display device may be applied as a multi-image display device that displays two images together.

[0139] The above-described image display device (1000) (2000) may operate by being linked to or connected to other electronic devices, such as a smartphone. For example, a processor that drives the image display device (1000) (2000) may be provided in a smartphone. In addition, the above-described image display device (1000) (2000) may be provided in a smartphone.

[0140] Up to now, exemplary embodiments have been described and illustrated in the accompanying drawings to aid in understanding the present invention. However, it should be understood that these embodiments are merely illustrative of the invention and are not limiting. It should also be understood that the present invention is not limited to the descriptions shown and described. This is because various other modifications may occur to those skilled in the art. Explanation of the symbols

[0141] 1000, 2000 - Video display device 100, 160, 170 - Display elements 200, 201, 202, 205, 260, 270 - Drive unit 210 - Housing 220 - Variable Shape Wire 227 - 1st shape variable wire 53 - Second shape variable wire 50 - 2nd actuator 51, 52 - Elastic Bridge 230, 235 - Fixing plate 250 - Elastic structures 270 - Movable plate 275 - Buckling structure 290, 295 - Movable structure 310 - Lack of focusing 330 - Beam Splitter 350 - Transparent light guide component

Claims

Claim 1 A display element that forms an image by modulating light; a light transmission unit that transmits the image formed by the display element to an observer's eye and includes a focusing member; and a driving unit that drives the display element so that its position is varied, comprising a first actuator including a shape-variable wire, a housing that fixes both sides of the shape-variable wire, and a movable structure to which the shape-variable wire is routed and which moves the display element along a first direction in conjunction with the variation in length of the shape-variable wire, and which includes a tilt prevention element that prevents tilt about an axis of the first direction. An image display device comprising a processor that controls the display element and the driving unit according to image information, wherein the movable structure comprises: a movable plate on which the display element is seated; a fixed plate fixed to the housing; and a tilt prevention element disposed between the movable plate and the fixed plate to elastically support the movement of the movable plate relative to the fixed plate; wherein the tilt prevention element comprises two elastic structures each provided on one side of the movable plate and on the other side facing the one side, and arranged 180° rotationally symmetrically with respect to the center of the movable plate, and wherein the two elastic structures each have a 4-bar linkage structure. Claim 2 An image display device according to claim 1, wherein the driving unit moves the display element in parallel so that the distance between the display element and the focusing member is varied. Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 A display element that forms an image by modulating light; a light transmission unit that transmits the image formed by the display element to an observer's eye and includes a focusing member; and a driving unit that drives the display element so that its position is varied, comprising a first actuator including a shape-variable wire, a housing that fixes both sides of the shape-variable wire, and a movable structure to which the shape-variable wire is routed and which moves the display element along a first direction in conjunction with the variation in length of the shape-variable wire, and which includes a tilt prevention element that prevents tilt about an axis of the first direction. A video display device comprising: a processor that controls the display element and the driving unit according to video information; wherein the movable structure comprises: a movable plate on which the display element is seated; a fixed plate fixed to the housing; and a tilt prevention element disposed between the movable plate and the fixed plate to elastically support the movement of the movable plate relative to the fixed plate; wherein the tilt prevention element comprises two elastic structures each provided on one side of the movable plate and on the other side facing the one side, and arranged 180° rotationally symmetrically with respect to the center of the movable plate, wherein the two elastic structures each comprise an intermediate plate, two lower link bars connecting the intermediate plate and the fixed plate, and two upper link bars connecting the intermediate plate and the movable plate. Claim 7 A display element that forms an image by modulating light; a light transmission unit that transmits the image formed by the display element to an observer's eye and includes a focusing member; and a driving unit that drives the display element so that its position is varied, comprising a first actuator including a shape-variable wire, a housing that fixes both sides of the shape-variable wire, and a movable structure to which the shape-variable wire is routed and which moves the display element along a first direction in conjunction with the variation in length of the shape-variable wire, and which includes a tilt prevention element that prevents tilt about an axis of the first direction. A video display device comprising: a processor that controls the display element and the driving unit according to video information; wherein the movable structure comprises: a movable plate on which the display element is seated; a fixed plate fixed to the housing; and a tilt prevention element disposed between the movable plate and the fixed plate to elastically support the movement of the movable plate relative to the fixed plate; wherein the tilt prevention element comprises two elastic structures provided on one side of the movable plate and on the other side facing the one side, respectively, and arranged symmetrically with respect to the center of the movable plate at a 180° rotation; wherein two routing through holes are provided in the center of the movable plate, and the shape-variable wire is arranged to be connected to the other side of the housing by passing through the two routing through holes in sequence from one side of the housing. Claim 8 In claim 7, a video display device having fixing through holes provided on each side of the housing, and the shape-variable wire being fixed by passing through the fixing through holes. Claim 9 An image display device according to claim 8, wherein the housing is further provided with a post disposed facing the fixing through hole, and the shape-variable wire is disposed to wrap around the post one or more times and then pass through the through hole. Claim 10 An image display device according to claim 6, wherein the shape variable wire comprises a first shape variable wire connecting one side of the intermediate plate and the fixed plate, and a second shape variable wire arranged symmetrically with respect to the first shape variable wire at a 180° rotation. Claim 11 A video display device according to claim 6, wherein the lower link bar has a width at the connection portion adjacent to the intermediate plate and the connection portion adjacent to the fixed plate that is narrower than other parts, and the upper link bar has a width at the connection portion adjacent to the intermediate plate and the connection portion adjacent to the movable plate that is narrower than other parts. Claim 12 In claim 11, the above-mentioned movable structure is an image display device having an integral structure processed from a single metal sheet. Claim 13 An image display device comprising: a display element that forms an image by modulating light; a light transmission unit that transmits the image formed by the display element to an observer's eye and includes a focusing member; a driving unit that drives the display element so that the position of the display element is varied and includes a first actuator including a shape-variable wire, a housing that fixes both sides of the shape-variable wire, and a movable structure in which the shape-variable wire is routed and which moves the display element along a first direction in conjunction with the length variation of the shape-variable wire, and which has a tilt prevention element that prevents tilt about the axis of the first direction; and a processor that controls the display element and the driving unit according to image information; wherein the movable structure includes a movable plate on which the display element is seated; a fixed plate fixed to the housing; and the tilt prevention element disposed between the movable plate and the fixed plate and elastically supports the movement of the movable plate relative to the fixed plate, and wherein buckling structures are provided on both sides of the movable plate to support the position change state of the movable plate. Claim 14 In claim 13, the housing comprises two side walls fixed to both sides of the shape-variable wire and a bottom surface fixed to the fixing plate, and the buckling structure is a strip shape with both ends elastically connected to one side of the movable plate and the side wall of the housing, an image display device. Claim 15 In claim 14, the buckling structure is an image display device in which an elastic coupling state is set between the side wall and one side of the movable plate so that the movable plate is in a stable state at a predetermined two-distance position relative to the fixed plate. Claim 16 An image display device according to claim 14, comprising a second actuator disposed between the movable plate and the bottom surface of the housing to provide driving force to the movable plate, the second actuator comprising a first elastic bridge having a curved surface convexly curved in the direction of the movable plate, a second elastic bridge having a curved surface convexly curved in the direction of the bottom surface, and a second shape variable wire fixed between both ends of the first elastic bridge and both ends of the second elastic bridge. Claim 17 In claim 16, the first elastic bridge has an elastic restoring force in the direction in which the radius of curvature increases, and the center of the first elastic bridge is fixed to the movable plate, forming an image display device. Claim 18 An image display device according to claim 17, wherein the second elastic bridge has an elastic restoring force in a direction in which the radius of curvature increases, and the center of the second elastic bridge is fixed to the bottom surface of the housing. Claim 19 In claim 16, the second actuator provides a driving force that moves the movable plate away from the fixed plate, and the first actuator provides a driving force that moves the movable plate toward the fixed plate. Claim 20 An image display device according to claim 19, wherein when the length of the second shape variable wire is shortened, the movable plate moves away from the fixed plate, and when the length of the shape variable wire is shortened, the movable plate moves closer to the fixed plate. Claim 21 An image display device according to claim 16, wherein power is applied to the first actuator and the second actuator, respectively, only while the lengths of the shape variable wire and the second shape variable wire change. Claim 22 In claim 1, the image display device wherein the shape-variable wire is made of a material whose shape changes by heat. Claim 23 In claim 22, the image display device wherein the shape variable wire comprises a shape memory alloy or an electroactive polymer. Claim 24 An image display device according to any one of claims 1, 2, 6 to 23, wherein the light transmission unit transmits an image formed in the display element to an observer's eye as an enlarged image on a virtual image plane at a predetermined position. Claim 25 In paragraph 24, the image information includes depth information linked to the position of the virtual plane for each of the images of multiple frames, and the processor generates a driving signal for the driving unit according to the depth information, an image display device. Claim 26 An image display device according to any one of claims 1, 2, 6 to 23, wherein the light transmission unit combines a first light containing an image from the display element and a second light containing a real environment image in front of the observer and transmits them to the observer's eye. Claim 27 An image display device according to claim 26, wherein the light transmission unit comprises a beam splitter positioned obliquely with respect to the propagation path of the first light and the propagation path of the second light; and the focusing member. Claim 28 An image display device according to any one of claims 1, 2, 6 to 23, wherein the display element comprises a first display element and a second display element, the driving unit comprises first and second driving units that drive the first display element and the second display element, respectively, so that the positions of the first display element and the second display element are variable, and the light transmission unit comprises a first light transmission unit and a second light transmission unit that transmit an image formed in the first display element and the second display element to the left eye and right eye of an observer, respectively. Claim 29 An image display device according to claim 28, wherein the image information includes information for a pair of left-eye images and right-eye images to be perceived as a three-dimensional image of one frame, and the processor controls the first display element and the second display element so that the left-eye image is formed in the first display element and the right-eye image is formed in the second display element.

Images