Indication device

Abstract

We provide display devices such as HMDs that achieve both miniaturization and high performance (including multi-functionality). [Solution] The present invention provides a display device comprising: two imaging units arranged in the left-right direction of the display device and imaging the front side of the display device; a processing board; two display units arranged in the left-right direction and displaying an image on the back side of the display device; a plurality of fans; and intake and exhaust ports, wherein the processing board and the two imaging units are positioned on the front side of the two display units; the plurality of fans are positioned on the front side of the processing board; when viewed from the front, the plurality of fans are positioned between the two imaging units; and the back surface of each of the two imaging units is positioned on the back side of the front surface of each of the plurality of fans.

Description

Technical Field

[0001] The present invention relates to a display device.

Background Art

[0002] A head-mounted display (HMD), which is a display device used in front of a user's eyes, can provide virtual reality (VR) and mixed reality (MR) to the user. When the performance of the HMD is improved or its functions are increased, the power consumption of the HMD increases, and the temperature of the HMD rises. To suppress the temperature rise of the HMD, a fan may be provided in the HMD. To suppress the temperature rise of the HMD, a fan may be provided in the HMD.

[0003] Patent Document 1 discloses the layout of a fan.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the technology disclosed in Patent Document 1, the miniaturization of the HMD is not sufficiently considered. The HMD is a display device used in front of a user's eyes and is preferably small and lightweight. When the HMD is small, the fan that can be used is also small. Generally, when the fan is small, the cooling capacity of the fan is low. Therefore, it is difficult to achieve both miniaturization and high performance (including multifunctionality) of the HMD.

[0006] An object of the present invention is to provide a display device such as an HMD that achieves both miniaturization and high performance (including multifunctionality).

Means for Solving the Problems

[0007] The present invention provides a display device comprising: two imaging units arranged in the left-right direction of the display device and imaging the front side of the display device; a processing board; two display units arranged in the left-right direction and displaying an image on the back side of the display device; a plurality of fans; and an intake and exhaust port, wherein the processing board and the two imaging units are positioned on the front side of the two display units; the plurality of fans are positioned on the front side of the processing board; when viewed from the front, the plurality of fans are positioned between the two imaging units; and the back surface of each of the two imaging units is positioned on the back side of the front surface of each of the plurality of fans. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a display device such as an HMD that achieves both miniaturization and high performance (including multi-functionality). [Brief explanation of the drawing]

[0009] [Figure 1] This is an external view of the display device. [Figure 2] This is a cross-sectional view of a display device. [Figure 3] This is a front view of the display device. [Figure 4] This is a rear view of the display device. [Figure 5] This is a bottom view of the display device. [Figure 6] This is a rear view of the display device. [Figure 7] This is a rear view of the display device. [Figure 8] This is a cross-sectional view of a display device. [Figure 9] A diagram showing a fan. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that the following embodiments do not limit the invention as defined in the claims. While several features are described below, not all of these features are necessarily essential to the invention. The features may be combined in any way. Furthermore, in the accompanying drawings, the same or similar components are given the same reference numerals, and redundant descriptions are omitted.

[0011] Figure 1 is an external view of the display device 10 according to this embodiment. In this embodiment, the display device 10 is assumed to be a head-mounted display (HMD), but the display device 10 is not limited to an HMD, and the features of this embodiment can be applied to various display devices to make the display device 10. The display device 10 has two cameras 110 (imaging units), two display units 120, a housing 100, and a cable 160. The cable 160 may be detachable from the display device 10. The user positions the display device 10 in front of their eyes so that the two display units 120 are positioned in front of each of their two eyes. In this state, the user's left-right direction is the left-right direction of the display device 10, and the user's up-down direction is the up-down direction of the display device 10. The side of the display device 10 facing the user is the back of the display device 10. The side of the display device 10 opposite to the back of the display device 10 is the front of the display device 10. From the perspective of the component, the side (direction) that approaches the user (the user with the display device 10 placed in front of their eyes) is the back side of the display device 10 for that component, and the side (direction) that moves away from the user from the perspective of the component is the front side of the display device 10 for that component. Hereafter, "of the display device 10" will be omitted as appropriate when indicating directions. The two cameras 110 are arranged side by side in the left-right direction of the display device 10 and are positioned to capture images of the front side of the display device 10. The two display units 120 are arranged side by side in the left-right direction of the display device 10 and are positioned to display images on the back side of the display device 10.

[0012] The display unit 120 displays images of a virtual space towards the user's eyes, allowing the user to experience virtual reality (VR). If the display unit 120 displays a composite image created by combining images of virtual objects (CG) with images of the real space captured by the camera 110, the user can experience mixed reality (MR). The camera 110 may also be used for self-localization and spatial recognition. By connecting the cable 160 to an external PC (personal computer) 170, various data (information), such as image data to be displayed on the display unit 120, can be sent and received between the display device 10 and the PC 170. Multiple intake and exhaust ports 130 are provided on the front (front of the display device 10) and the side (side of the display device 10) of the housing 100 for taking in and expelling outside air with a number of fans (not shown). The side is a different surface from the front and back, for example, the left side or the right side.

[0013] Note that the external device connected using cable 160 is not limited to PC 170, but may be a smartphone or tablet terminal, etc. Also, the image data displayed on the display unit 120 may be acquired from an external device or generated within the display device 10 (for example, on the processing board 140 described later). Cable 160 may be connected to an external power supply (battery). By doing so, power can be supplied to the display device 10. In this case, various data (information), such as image data to be displayed on the display unit 120, may be transmitted and received between the display device 10 and PC 170 via wireless communication.

[0014] Figure 2 is a cross-sectional view of the display device 10 obtained by a plane perpendicular to the vertical direction. The display device 10 has a plurality of fans 150, a processing board 140, and partitions 151 inside the housing 100. Line A indicates the optical axis of the camera 110, and line B (a polyline) indicates the optical axis of the display unit 120.

[0015] The display unit 120 includes a display element 121 and a display optical system 122. The light emitted from the light-emitting surface of the display element 121 passes through and is reflected by a prism, which is the display optical system 122, and is output to the outside (the back side). Note that the display optical system 122 is not limited to a prism, and for example, a polarization optical system using a polarization element may be used.

[0016] Of the straight line B, which is the optical axis of the display unit 120, the portion after the light is output to the outside substantially coincides with the straight line A, which is the optical axis of the camera 110. Also, the direction in which the camera 110 images the outside world is defined as the front side. For example, the straight line A, the straight line B, or both of them are used as axes that define the front side and the back side. Note that, of the straight line B, which is the optical axis of the display unit 120, the portion after the light is output to the outside does not have to coincide with the straight line A, which is the optical axis of the camera 110, and may be shifted or deviated with respect to the straight line A, or may be inclined and deviated with respect to the straight line A.

[0017] The processing substrate 140 and the two cameras 110 are arranged on the front side of the two display units 120. For example, as shown in FIG. 2, the back surface (the surface on the back side) of the processing substrate 140 and the back surfaces (the surfaces on the back side) of the two cameras 110 are arranged on the front side of the front surface (the surface on the front side) of the display unit 120. In FIG. 2, since the display element 121 is arranged on the front side of the display optical system 122, the front surface of the display unit 120 is the front surface (the surface on the front side) of the display element 121. The processing substrate 140 has a circuit that processes the two images captured by the two cameras 110. For example, the processing substrate 140 performs coordinate conversion processing or the like on the two images captured by the two cameras 110. The two display units 120 display two images based on the two images captured by the two cameras 110, for example, the two images processed by the above circuit.

[0018] The plurality of fans 150 are arranged on the front side of the processing substrate 140. For example, as shown in FIG. 2, the back surface (the surface on the back side) of each of the plurality of fans 150 is arranged on the front side of the front surface (the surface on the front side) of the processing substrate 140. The plurality of fans 150 are arranged to cool the processing substrate 140 that is a heat source, and by providing the plurality of fans 150, it becomes possible to enhance the performance (including multifunctionalization) of the display device 10.

[0019] When viewed from the front side, the plurality of fans 150 are arranged between the two cameras 110. Also, the back surface (the surface on the back side) of each of the two cameras 110 is arranged on the back side of the front surface (the surface on the front side) of each of the plurality of fans 150. With these arrangements, the thickness (length) in the front-rear direction (front-back direction) of the display device 10 can be reduced, and miniaturization of the display device 10 can be achieved. Also, since the processing substrate 140 that is a heat source is arranged in the path of the air flowing through the plurality of fans 150, the processing substrate 140 can be effectively cooled. As a result, it is possible to provide the display device 10 that achieves both miniaturization and high performance (including multifunctionalization).

[0020] FIG. 3 is a front view showing the inside of the display device 10. As described above, when viewed from the front side, the plurality of fans 150 are arranged between the two cameras 110. Between the two cameras 110 means, for example, as shown in FIG. 3, between two surfaces C each passing through the center of the camera 110 and parallel in the vertical direction.

[0021] The number of the fans 150 is not particularly limited. Among the plurality of fans 150, the fan 150 provided at the central portion of the display device 10 in the left-right direction may be arranged on the top surface side (upper surface side) of the display device 10 rather than the fans 150 not provided at the central portion. The fan 150 provided at the central portion The number of the fans 150 may be one or two or more. By doing so, it becomes easier to form the escape space 180 of the display device 10. The escape space 180 is formed, for example, in the housing 100.

[0022] Figure 4 is a rear view showing the external appearance of the display device 10. A nose relief 180 is formed in the housing 100 and the display unit 120, and a window 123 is formed in the display unit 120 for the user to look into in order to view the displayed image. The window 123 may or may not be covered by a transparent material. If the window 123 is not covered by a transparent material, the display optical system 122 is exposed.

[0023] As shown in Figure 4, the vertical length of the display device 10 is approximately equal to the vertical length of each of the two display units 120. Since no components such as the fan 150 are located on the top side of the display unit 120, this configuration is possible, and miniaturization of the display device 10 can be achieved not only in the front-to-back direction but also in the vertical direction. Furthermore, from the viewpoint of ease of holding when directly gripping the display device 10, it is preferable that the vertical length of the display device 10 be 30 mm or more and 50 mm or less.

[0024] Figure 5 is a bottom view of the display device 10. Numerous intake and exhaust ports 130 are provided on the bottom (underside) of the housing 100 and the display unit 120. The intake and exhaust ports 130 are not provided on the top surface of the display device 10. Therefore, the risk of foreign matter entering from the top surface can be reduced. The distance between the two display units 120 may be changed according to the user's interpupillary distance (distance between the right and left eyes). In that case, it is preferable that the intake and exhaust ports 130 are not hidden by the two display units 120 (the total area of ​​the intake and exhaust ports 130 does not change) so that the cooling capacity of the multiple fans 150 does not change even if the distance between the two display units is changed. For example, the intake and exhaust ports 130 do not need to be provided on the back of the housing 100 (the back of the display device 10) so that they are not hidden by the two display units 120. The intake and exhaust ports 130 may be provided in the center or at the edges of the back of the housing 100 so that they are not obscured by the two display units 120.

[0025] As shown in Figure 1, the intake and exhaust ports 130 are also provided on the front of the display device 10. The multiple fans 150 are arranged to face the intake and exhaust ports 130 provided on the front of the display device 10. In order to shorten the distance from the intake and exhaust ports 130 provided on the front of the display device 10 to the multiple fans 150, it is preferable that each of the multiple fans 150 be an axial flow fan. In order to suppress exhaust air towards the user's face and to increase the area of ​​the intake port, it is preferable to use the intake and exhaust ports 130 provided on a side other than the front of the display device 10 as the exhaust port, and to use the intake and exhaust ports 130 provided on a side other than the front of the display device 10 as the intake port.

[0026] Figure 6 is a rear view showing the inside of the display device 10 (the side in front of the processing board 140). To improve the cooling capacity of the multiple fans 150, partitions 151 may be provided to separate the multiple fans 150 from each other. The partitions 151 may be part of the housing 100, or they may be made of parts different from the housing 100. Preferably, the rear end of the partitions 151 extends close to the processing board 140.

[0027] Furthermore, as shown in Figure 6, when viewed from the front, each of the multiple fans 150 has a rectangular outline. In Figure 6, two of the four sides of the outline (rectangle) of each of the multiple fans 150 are approximately parallel to the left-right direction of the display device 10, and the remaining two approximately parallel sides are approximately parallel to the up-down direction of the display device 10. The arrangement of the fans 150 is not limited to the arrangement shown in Figure 6, and may be, for example, the arrangement shown in Figure 7. In Figure 7, two diagonals of the outline (rectangle) of each of the multiple fans 150 are approximately parallel to the left-right direction and the up-down direction of the display device 10, respectively. They are arranged in rows. This reduces the distance between the centers of the multiple fans 150. Therefore, when a heat-generating element is located in the center of the processing board 140, improved heat dissipation efficiency can be expected. In addition, depending on the vertical length of the display device 10, it is possible to increase the size of each of the multiple fans 150 while maintaining the distance between the centers of the two cameras 110, thereby improving the cooling capacity.

[0028] Heat sinks or heat dissipation fins may be provided on the back (rear side) of the camera 110, which is a heat source, the front (front side) and back (rear side) of the processing board 140, and the back (rear side) of the display element 121, depending on the power consumption of the display device 10. However, since metal parts have a high specific gravity, it is preferable to keep the amount (number and size) of heat sinks and heat dissipation fins to the minimum necessary from the viewpoint of reducing the weight of the display device 10. By forming ducts inside the display device 10 that serve as passages for air flowed by multiple fans 150, and by placing the heat sinks and heat dissipation fins close to the intake and exhaust ports 130, improved heat dissipation efficiency can be expected.

[0029] Figure 8 shows a modified cross-sectional view of the display device 10 obtained by a plane perpendicular to the vertical direction. As shown in Figure 8, the length of the processing board 140 in the left-right direction may be shortened, and the two cameras 110 may be brought closer to the display unit 120. For example, the front (front side) of each of the two cameras may be positioned further back than the front (front side) of each of the multiple fans 150. By doing so, further miniaturization of the display device 10 can be achieved in the front-to-back direction as well.

[0030] Since the display device 10 is used in close proximity to the face, it is preferable that each of the multiple fans 150 be a low-speed, quiet fan. However, the cooling capacity of quiet fans is relatively low. Therefore, it is preferable that the total area of ​​the intake and exhaust ports 130 of the display device 10 be large. Specifically, it is preferable that the total area of ​​the intake and exhaust ports 130 be at least 1 / 3 of the total area of ​​the annular regions of the multiple fans 150. The annular region is the area through which air passes, where the blades are formed, when viewed parallel to the rotation axis of the fan 150. Figure 9 shows a fan 150, and the fan 150 has a rotation axis perpendicular to the plane of the paper in Figure 9. In Figure 9, blades are formed extending from a position of diameter d (inner diameter) to a position of diameter D (outer diameter) centered on the rotation axis. In this case, (D 2 -d 2 The circular region of one fan can be calculated using π / 4.

[0031] As described above, according to this embodiment, it is possible to provide a display device that achieves both miniaturization and high performance (including multi-functionality).

[0032] Although embodiments of the present invention have been described in detail, the present invention is not limited to these specific embodiments, and various forms that do not depart from the spirit of the invention are also included in the present invention. Furthermore, each of the embodiments described above is merely one embodiment of the present invention, and it is possible to combine each embodiment as appropriate.

[0033] This embodiment includes the following configuration. (Composition 1) A display device, The device has two imaging units arranged in the left-right direction and imaging the front side of the device, a processing board, two display units arranged in the left-right direction and displaying images on the back side of the device, a plurality of fans, and intake and exhaust ports. The processing board and the two imaging units are positioned on the front side of the two display units. The aforementioned multiple fans are positioned on the front side of the processing board, When viewed from the front, the multiple fans are arranged between the two imaging units. The rear surface of each of the two imaging units is positioned further back than the front surface of each of the multiple fans. A display device characterized by the following features. (Configuration 2) The two display units display two images based on the two images captured by the two imaging units. The display device according to configuration 1, characterized by the above. (Composition 3) The processing board processes the two images captured by the two imaging units. A display device according to configuration 1 or 2, characterized by the above. (Composition 4) The plurality of fans cool the processing board. A display device according to any one of configurations 1 to 3, characterized by the above. (Composition 5) The vertical length of the display device is approximately equal to the vertical length of each of the two display units. A display device according to any one of configurations 1 to 4, characterized by the above. (Composition 6) The vertical length of the aforementioned display device is 30 mm or more and 50 mm. A display device according to any one of configurations 1 to 5, characterized by the above. (Composition 7) Each of the aforementioned fans is an axial fan. A display device according to any one of configurations 1 to 6, characterized by the above. (Composition 8) Of the multiple fans, the fan located in the center of the display device in the left-right direction is positioned closer to the top surface of the display device than the fans not located in the center. A display device according to any one of configurations 1 to 7, characterized by the above. (Composition 9) The aforementioned multiple fans further have partitions separating them from one another. A display device according to any one of configurations 1 to 8, characterized by the above. (Composition 10) The intake and exhaust ports are provided on a surface different from the top surface of the display device. A display device according to any one of configurations 1 to 9, characterized by the above. (Composition 11) The distance between the two display units can be changed. Even if the distance between the two display units is changed, the intake and exhaust ports will not be obscured by the two display units. A display device according to any one of configurations 1 to 10, characterized by the above. (Composition 12) The intake and exhaust ports are located on the front of the display device. A display device according to any one of configurations 1 to 11, characterized by the above. (Composition 13) The intake and exhaust ports include an exhaust port provided on the front of the display device and an intake port provided on a side of the display device other than the front. A display device according to any one of configurations 1 to 11, characterized by the above. (Composition 14) Each of the aforementioned multiple fans has an annular region through which air passes, where blades are formed, when viewed parallel to the fan's axis of rotation. The total area of ​​the intake and exhaust ports is at least one-third of the total area of ​​the annular regions of the multiple fans. A display device according to any one of configurations 1 to 13, characterized by the above. (Composition 15) The front surfaces of each of the two imaging units are positioned further back than the front surfaces of each of the multiple fans. A display device according to any one of configurations 1 to 14, characterized by the above. (Composition 16) When viewed from the front side, Each of the aforementioned multiple fans has a rectangular outline, Each of the aforementioned fans is positioned such that the two diagonals of the rectangle are substantially parallel to the left-right and up-down directions of the display device, respectively. A display device according to any one of configurations 1 to 15, characterized by the above. [Explanation of symbols]

[0034] 10: Display device 110: Camera 120: Display unit 130: Intake and exhaust ports 140: Processing board 150: Fan

Claims

1. A display device, The device has two imaging units arranged in the left-right direction and capturing images of the front side of the device, a processing board, two display units arranged in the left-right direction and displaying images on the back side of the device, a plurality of fans, and intake and exhaust ports. The processing board and the two imaging units are positioned on the front side of the two display units. The aforementioned multiple fans are positioned on the front side of the processing board, When viewed from the front, the multiple fans are arranged between the two imaging units. The rear surface of each of the two imaging units is positioned further back than the front surface of each of the multiple fans. A display device characterized by the following features.

2. The two display units display two images based on the two images captured by the two imaging units. The display device according to feature 1.

3. The processing board processes the two images captured by the two imaging units. The display device according to feature 1 or 2.

4. The plurality of fans cool the processing board. The display device according to feature 1 or 2.

5. The vertical length of the display device is approximately equal to the vertical length of each of the two display units. The display device according to feature 1 or 2.

6. The vertical length of the aforementioned display device is 30 mm or more and 50 mm. The display device according to feature 1 or 2.

7. Each of the aforementioned fans is an axial fan. The display device according to feature 1 or 2.

8. Of the multiple fans, the fan located in the center of the display device in the left-right direction is positioned closer to the top surface of the display device than the fans not located in the center. The display device according to feature 1 or 2.

9. The aforementioned multiple fans further have partitions separating them from one another. The display device according to feature 1 or 2.

10. The intake and exhaust ports are provided on a surface different from the top surface of the display device. The display device according to feature 1 or 2.

11. The distance between the two display units can be changed. Even if the distance between the two display units is changed, the intake and exhaust ports will not be obscured by the two display units. The display device according to feature 1 or 2.

12. The intake and exhaust ports are located on the front of the display device. The display device according to feature 1 or 2.

13. The intake and exhaust ports include an exhaust port provided on the front of the display device and an intake port provided on a side of the display device other than the front. The display device according to feature 1 or 2.

14. Each of the aforementioned multiple fans has an annular region through which air passes, where blades are formed, when viewed parallel to the fan's axis of rotation. The total area of ​​the intake and exhaust ports is at least one-third of the total area of ​​the annular regions of the multiple fans. The display device according to feature 1 or 2.

15. The front surfaces of each of the two imaging units are positioned further back than the front surfaces of each of the multiple fans. The display device according to feature 1 or 2.

16. When viewed from the front side, Each of the aforementioned multiple fans has a rectangular outline, Each of the aforementioned fans is positioned such that the two diagonals of the rectangle are substantially parallel to the left-right and up-down directions of the display device, respectively. The display device according to feature 1 or 2.

Images