Spherical display structure and CAVE system having the same

Abstract

The present invention provides a spherical display structure and a CAVE system having the same. The spherical display structure includes a light board unit, wherein the light board units are multiple, and the multiple light board units are spliced ​​to form a spherical structure. The upper side of the light board unit along the latitude direction of the spherical structure and the lower side opposite to the upper side are both arc-shaped structures, and the lengths of the upper side and the lower side are not equal. The upper side of one of the two light board units adjacent to each other in the latitude direction is adjacent to the lower side of the other light board unit. The light board unit structure adopting this structure allows the light board units to be spliced ​​and combined arbitrarily at an integer multiple of X degrees in the horizontal field of view angle, and to be spliced ​​and combined arbitrarily at an integer multiple of Y degrees in the vertical field of view angle to form a spherical display structure. Such an arrangement can effectively improve the display effect of the display structure.

Description

Technical Field

[0001] The present invention relates to the technical field of display systems, and in particular to a spherical display structure and a CAVE system having the same. Background Art

[0002] Since the CAVE system can provide a simulation environment with a large field of view, strong immersion, and high fidelity, it has been highly valued in the simulation field since its birth. In 1992, the EVL Laboratory of Illinois State University designed the first CAVE system, which used four SGI workstations to synchronously generate 120Hz stereo images and four projectors to display them on the screen. However, due to the high prices of workstations and projectors, the user group of the CAVE system was limited to research institutions for a long time.

[0003] With the rapid development of information technology, the application scope of CAVE system is becoming more and more extensive, and its technical form has also changed. From the display screen (screen) splicing form, it includes two or more plane splicing, cylinder, sphere, hyperbolic surface, frustum, etc. From the display technology point of view, it includes projector, LCD, LED display unit splicing, etc. Due to the large gap of LCD plane splicing, LED display unit splicing has gradually received attention in the field of display technology. In the existing technology, a CAVE system is constructed using four surfaces: front, bottom, left, and right. The splicing between each surface is at a right angle of 90 degrees. Due to the directionality of LED lights, there will be color difference on the side, and the horizontal field of view angle generally does not exceed 180 degrees.

[0004] Due to the advantages of seamless splicing, high reliability, wide color gamut, low life-cycle cost, and wide brightness adjustment range, LED display products have been widely used in outdoor guidance, advertising, and display venues, as well as indoor command centers, conference centers, monitoring centers, and dispatch centers. Although there are not many LED spherical display products, people's exploration of LED spherical display technology is basically carried out in parallel with conventional display technology.

[0005] The prior art also divides the spherical display part into a limited number of trapezoids and triangles of different sizes, or divides the outer surface shape of the module into quadrilaterals, and proposes to arrange LED lights along longitude and latitude lines to form an LED spherical screen. The prior art also proposes a display device composed of a spherical display screen and a base, and solves the problem of LED layout angle to make the screen present better uniformity.

[0006] LED spherical display technology has been widely used in the field of creative display. Due to the processing accuracy and difficulty in improving the dot pitch, the current LED spherical display products are generally used for outdoor displays with a long viewing distance such as museums, experience centers, and entertainment centers. The LED dot pitch ranges from P10 to P3. However, the dot pitch of LED spherical display screens in the existing technology is large and cannot be applied to spherical display systems of simulation equipment such as flight simulators, navigation simulators, and special vehicle simulators. Summary of the invention

[0007] The main purpose of the present invention is to provide a spherical display structure and a CAVE system having the same, so as to solve the problem of poor display effect of the display system in the prior art.

[0008] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a spherical display structure is provided, including: a light board unit, a plurality of light board units, and the plurality of light board units are spliced ​​to form a spherical structure, the upper side of the light board unit along the latitude direction of the spherical structure and the lower side opposite to the upper side are both in an arc-shaped structure, and the lengths of the upper side and the lower side are not equal, and the upper side of one of the two light board units adjacent to each other in the latitude direction is arranged adjacent to the lower side of the other light board unit.

[0009] Furthermore, a first side edge of the light panel unit along the meridian direction of the spherical structure and a second side edge opposite to the first side edge are both straight-edge structures.

[0010] Furthermore, the spherical display structure also includes: a lamp bead group, there are multiple lamp bead groups, and the multiple lamp bead groups are evenly arranged on the light board unit along the latitude direction. The lamp bead group includes multiple lamp beads, and the center distance between adjacent lamp beads is L, L=PN, wherein P is the preset distance between adjacent lamp beads, and N is the offset.

[0011] Further, P=1.875mm, and / or, N≤1mm.

[0012] Furthermore, the number of lamp beads in each lamp bead group is the same, and the number of lamp beads in two adjacent lamp bead groups is different.

[0013] Furthermore, the lamp beads in the lamp bead group are arranged in rows along the latitude direction, and the number of lamp beads in each row is the same.

[0014] Furthermore, the distance between the lamp beads of the lamp bead group close to the first side and the edge of the first side is half of the preset distance, and / or the distance between the lamp beads of the lamp bead group close to the second side and the edge of the second side is half of the preset distance.

[0015] Furthermore, there are n1 lamp beads arranged along the latitude direction near the upper side. When the distance between adjacent lamp beads is less than PN, there are K lamp beads arranged along the latitude direction on the lower side of another light board unit adjacent to the upper side, where k≥1.

[0016] Furthermore, when the plurality of lamp bead groups transition to the poles of the spherical structure along the latitude direction, the lamp beads at the poles are arranged at the edges of the first side or the second side of the lamp panel unit.

[0017] Furthermore, the spherical display structure also includes: a mounting bracket, the light panel unit is connected to the mounting bracket; and an arc-shaped mounting frame, the mounting bracket is connected to the arc-shaped mounting frame.

[0018] According to another aspect of the present invention, a CAVE system is provided, comprising a spherical display structure, wherein the spherical display structure is the spherical display structure described above.

[0019] By applying the technical solution of the present invention and adopting the light board unit structure of the structure, the light board units can be randomly spliced ​​and combined at the horizontal field angle of an integer multiple of X degrees, and at the vertical field angle of an integer multiple of Y degrees to form a spherical display structure. Such a setting can effectively improve the display effect of the display structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 A schematic diagram of an exploded structure of an embodiment of a display structure according to the present invention is shown;

[0022] Figure 2 A schematic diagram of the assembly structure of the lamp board unit and the lamp beads is shown;

[0023] Figure 3 A schematic diagram of the visual effect between vision and pixel points is shown;

[0024] Figure 4 A schematic diagram of the visual effect between the vision and the lamp beads is shown;

[0025] Figure 5 A schematic diagram of the unfolded structure of the light panel is shown.

[0026] The above drawings include the following reference numerals:

[0027] 10. Light board unit; 11. Upper side; 12. Lower side; 13. First side; 14. Second side;

[0028] 20. Lamp bead set;

[0029] 30. Mounting bracket; 40. Arc-shaped mounting frame; DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0034] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0035] Combination Figures 1 to 4 As shown, according to an embodiment of the present invention, a spherical display structure is provided.

[0036] like Figure 1 As shown, the spherical display structure includes a light board unit 10. There are multiple light board units 10, and the multiple light board units 10 are spliced ​​to form a spherical structure. The upper side 11 of the light board unit 10 along the latitude direction of the spherical structure and the lower side 12 arranged opposite to the upper side 11 are both arc-shaped structures, and the lengths of the upper side 11 and the lower side 12 are not equal. The upper side 11 of one of the two light board units 10 adjacent to each other in the latitude direction is arranged adjacent to the lower side 12 of the other light board unit 10.

[0037] In this embodiment, the light board unit structure of this structure can be used to arbitrarily splice and combine the light board units at an integer multiple of X degrees in the horizontal field of view, and arbitrarily splice and combine the light board units at an integer multiple of Y degrees in the vertical field of view to form a spherical display structure. This arrangement can effectively improve the display effect of the display structure. Among them, the XY values ​​are related to the diameter. Generally, the divided unit modules meet the ergonomic standard requirements in terms of design weight and size. For example, for a spherical screen with a diameter of 7000mm, the X value is 15 and the Y value is 10.

[0038] The first side edge 13 of the light board unit 10 along the meridian direction of the spherical structure and the second side edge 14 opposite to the first side edge 13 are both straight-edge structures. This arrangement can effectively improve the display effect of the display structure.

[0039] like Figure 2As shown, the spherical display structure also includes a lamp bead group 20. There are multiple lamp bead groups 20, and the multiple lamp bead groups 20 are evenly arranged on the light board unit 10 along the latitude direction, and the lamp bead group 20 includes multiple lamp beads 21. The center distance between adjacent lamp beads 21 is L, L=PN, where P is the preset distance between adjacent lamp beads 21, and N is the offset. Preferably, P=1.875mm, N≤1mm. That is, in this embodiment, the spherical display structure can be a spherical display screen, and the spherical display screen includes a lamp point arrangement rule in the longitude and latitude directions, which is based on human vision and is optimized for computer algorithm implementation.

[0040] like Figure 2 As shown, the lamp panel unit shows three lamp groups of G1, G2, and G3 structures, wherein the number of lamp beads 21 in each lamp bead group 20 is the same, and the number of lamp beads 21 in two adjacent lamp bead groups 20 is different. The lamp beads 21 in the lamp bead group 20 are arranged in rows along the latitude direction, and the number of lamp beads 21 in each row is the same. Such an arrangement can effectively optimize the arrangement position of the lamp beads, thereby achieving the effect of improving the display effect of the lamp beads.

[0041] In order to prevent the lamp beads installed on the lamp board unit from falling exactly on the joint of the lamp board unit, the distance between the lamp beads 21 of the lamp bead group 20 close to the first side 13 and the edge of the first side 13 is set to half of the preset distance. The distance between the lamp beads 21 of the lamp bead group 20 close to the second side 14 and the edge of the second side 14 is also set to half of the preset distance.

[0042] Furthermore, there are n1 lamp beads 21 arranged along the latitude direction near the upper side 11, and when the distance between adjacent lamp beads 21 is less than PN, there are k lamp beads 21 arranged along the latitude direction on the lower side 12 of another light board unit 10 arranged adjacent to the upper side 11, where k ≥ 1. This arrangement can reasonably arrange the placement positions of the lamp beads in each group.

[0043] In order to improve the stability and reliability of the display structure, the spherical display structure further includes a mounting bracket 30 and an arc-shaped mounting frame 40. The light panel unit 10 is connected to the mounting bracket 30. The mounting bracket 30 is connected to the arc-shaped mounting frame 40.

[0044] The spherical display structure in the above embodiment can also be used in the technical field of CAVE system equipment, that is, according to another aspect of the present invention, a CAVE system is provided. The CAVE system includes a spherical display structure. The spherical display structure is the spherical display structure in the above embodiment.

[0045] In the prior art, when the assembly accuracy requirements are not high, we can approximately divide the sphere into trapezoids and quadrilaterals. When the viewing distance is far, it can still bring a good experience effect. However, as a spherical screen for building a CAVE system, due to the close viewing distance, trapezoids, quadrilaterals, including cylindrical splicing, will have splicing gaps, reducing the experience effect. In fact, due to the different lengths of the two latitudes of the sphere, from the two cross-sections of the sphere, this slice can be regarded as a truncated cone, and a straight cut along the meridian direction can form a truncated cone light board. The joints of the upper and lower light boards are spliced ​​along the intersection line of the two truncated cones to ensure seamlessness.

[0046] In this embodiment, the diameter of the spherical display structure is 7000 mm, the standard spacing is 1.875 mm, the vertical viewing angle is 90 degrees along the equator, and it is evenly divided into 6 boxes along the meridian direction. Figure 5 As shown in the figure, AB is a part of the longitude, BC and AD are latitudes, angle AOB is equal to 15 degrees, angle AOK is equal to 30 degrees, BC is the upper edge of the box (composed of several light panel units spliced ​​together), and AD is the lower edge of the box.

[0047] In this way, when the latitude BC is unfolded to a plane, it will form a fan with P as the center and PB as the radius. When the latitude AD is unfolded to a plane, it will form a fan with P as the center and PA as the radius. The two fan surfaces minus the overlapping parts are the unfolded surface of the ADCB cone.

[0048] The conventional method of distributing the lamp beads may easily cause the lamp beads to be cut by the edge lines B and C. In order to solve this technical problem, Figure 3 As shown, the distance between two pixel points (LED lights) is P, and the straight-line distance from the observer's cornea to the two points is D. The viewing angle θ can be calculated according to the following formula: , when θ is small, we have Since the human eye's ability to resolve is limited, when P reaches a certain level, the eye cannot distinguish the two points, which is what we often say is that we cannot feel the granularity of the LED display.

[0049] like Figure 4 As shown in the figure, on a small pitch LED display, since the θ value is small, if the θ angle is measured in arc minutes, then The visual acuity of the eye in distinguishing the details of the scene is determined by the size of the human photosensitive cells. When two points are imaged in the macula, the limit of the resolution is about 1 arc minute. At this time, two LED pixels are imaged on one photosensitive cell, and the human eye will not be able to distinguish them as two pixels; when two pixels are imaged on two adjacent photosensitive cells, that is, 1<θ<2, the human eye will feel that they are two adjacent pixels, and the graininess will be different depending on the size of the LED lamp, but it is not obvious; when θ>2, the human eye will see obvious graininess when looking at the two LED lamps.

[0050] The sampling method in the prior art is improved so that the pixel spacing value allows an error of less than 1 arc minute, rather than a certain ratio. In this embodiment, on the inner sphere with a diameter of 7000mm, the maximum spacing P of the LED lamp beads is 1.875mm, and the viewing angle θ is 1.84 arc minutes when viewed from the center of the sphere; when the viewing angle is 1 arc minute, the spacing between the LED lamp beads is 1mm. It can be seen that in order to ensure a good display effect, the change value of the LED lamp beads is an absolute value less than 1mm rather than a relative value. In this example, the requirement of less than 1mm gives a larger range of variation. Accordingly, the change of the LED lamp beads can be carried out according to the following rules:

[0051] The lamp beads on the latitude of the light board unit are grouped, and the lamp beads on each latitude are arranged according to the following rules: the width of the lamp beads on the first side and the second side from the edge is the same, the number of lamp beads in each group on the latitude is the same, and the spacing is evenly distributed. When the lamp bead spacing is less than PN (N is the offset, which can be less than 1mm in this example), a point is drawn on the latitude and transitioned to the second group, and the rest is analogous. When transitioning to the extreme point, only one LED lamp bead on the edge of the side is retained. That is, when multiple lamp bead groups transition to the extreme point of the spherical structure along the latitude direction, the lamp beads at the extreme point are set at the edge of the first side or the second side of the light board unit.

[0052] Specifically, Figure 2 As shown, the number of lamp beads in each group of G1, G2, and G3 in the latitude direction is the same, and the lamp beads on the warp lines of the first and second sides close to the joints are evenly arranged along the same warp line, ensuring that the lamp beads are equidistant from the lamp beads of the adjacent light board units on the first and second sides. Although there is an error in the middle lamp beads of two adjacent groups along the warp direction, if this error is controlled within a viewing angle of 1 arc minute, the human eye cannot distinguish this error. Of course, the visual resolution ability of the human eye is also related to chromaticity and brightness. Therefore, according to different application requirements, appropriate values ​​within the error range of less than 1 arc minute can obtain satisfactory visual effects.

[0053] Furthermore, the upper and lower lines of the G3 group of lamp beads are arcs with the same curvature but different lengths. If 20 lamp beads are arranged on the same latitude, and the spacing on the lowest latitude is 1.875mm, then the spacing of the lamp beads on the upper latitude must be less than 1.875mm. If the allowable spacing offset is 1mm (corresponding to a visual resolution of 1 arc minute), when the spacing of the upper lamp beads of the G3 group is less than 0.875mm, 1 to N lamp beads are reduced on the lower latitude of the G2 group, so that the spacing of the lamp beads on the latitude is close to 1.875, and the number of reduced lamp beads is determined by the spacing. Transition to the next group and so on.

[0054] To avoid the lamp beads on the light board being arranged exactly on the joints of the two adjacent light boards on the left and right, the leftmost and rightmost lamp beads of each light board are arranged first. The distance between the center of the lamp bead and the left and right edges is the same, about 1.875mm×1 / 2, and the middle lamp beads can be arranged according to the above rules. The spacing between the lamp beads in two adjacent rows, that is, the arrangement of the lamp beads at the intersection of the same longitude and two latitudes, is 1.875mm.

[0055] This arrangement can, firstly, effectively avoid the problem of the seams along the longitude direction just cutting the lamp beads; secondly, the corresponding reference lines can reduce the difficulty of the algorithm for the computer-generated simulation vision system; thirdly, the lamp beads on different latitudes in the same group are the same, and the vision image can be displayed without deformation, which can improve the computing speed of the computer vision system.

[0056] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0057] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A spherical display structure, characterized in that: include: A light board unit (10), wherein the light board units (10) are multiple, and the multiple light board units (10) are spliced ​​to form a spherical structure, the upper side edge (11) of the light board unit (10) along the latitude direction of the spherical structure and the lower side edge (12) arranged opposite to the upper side edge (11) are both arc-shaped structures, and the lengths of the upper side edge (11) and the lower side edge (12) are not equal, and the upper side edge (11) of one of the two light board units (10) arranged adjacent to each other in the warp direction is arranged adjacent to the lower side edge (12) of the other light board unit (10); the lengths of the two latitude lines of the spherical surface are different, and from the two cross-sections of the sphere, this slice can be regarded as a truncated cone, and a light board unit (10) with a truncated cone surface can be formed by cutting straight along the warp direction, and the joint between the upper and lower light board units (10) is spliced ​​along the intersection line of the two truncated cones to ensure that there is no gap; A lamp bead group (20), wherein there are a plurality of lamp bead groups (20), the plurality of lamp bead groups (20) being evenly arranged on the lamp board unit (10) along a latitude direction, the lamp bead group (20) comprising a plurality of lamp beads (21), wherein the lamp beads (21) in the lamp bead group (20) are arranged in rows along a latitude direction, the number of the lamp beads (21) in each row of each lamp bead group (20) is the same, and two adjacent lamp bead groups (20) are adjacently arranged along a longitude direction, and the number of the lamp beads (21) in the two adjacent lamp bead groups (20) is different; The first side edge (13) of the light panel unit (10) along the meridian direction of the spherical structure and the second side edge (14) opposite to the first side edge (13) are both straight-edge structures.

2. The spherical display structure according to claim 1, characterized in that: The center distance between adjacent lamp beads (21) is L, L=PN, wherein P is a preset distance between adjacent lamp beads (21), and N is an offset.

3. The spherical display structure according to claim 2, characterized in that: P=1.875mm, and / or, N≤1mm.

4. The spherical display structure according to claim 2, characterized in that: The lamp beads (21) in the lamp bead group (20) are arranged in rows along the latitude direction, and the number of the lamp beads (21) in each row is the same.

5. The spherical display structure according to claim 2, characterized in that: The distance between the lamp bead (21) of the lamp bead group (20) close to the first side (13) and the edge of the first side (13) is half of a preset distance, and / or the distance between the lamp bead (21) of the lamp bead group (20) close to the second side (14) and the edge of the second side (14) is half of a preset distance.

6. The spherical display structure according to claim 2, characterized in that: The number of the lamp beads (21) arranged along the latitude direction near the upper side edge (11) is n1, and when the distance between adjacent lamp beads (21) is less than PN, the number of the lamp beads (21) arranged along the latitude direction on the lower side edge (12) of another lamp board unit (10) arranged adjacent to the upper side edge (11) is k, wherein k≥1.

7. The spherical display structure according to claim 2, characterized in that: When the plurality of lamp bead groups (20) transition to the pole of the spherical structure along the latitude direction, the lamp bead (21) located at the pole is arranged at the edge of the first side (13) or the second side (14) of the lamp board unit (10).

8. The spherical display structure according to claim 1, characterized in that: The spherical display structure also includes: A mounting bracket (30), the light panel unit (10) being connected to the mounting bracket (30); An arc-shaped mounting frame (40), wherein the mounting bracket (30) is connected to the arc-shaped mounting frame (40).

9. A CAVE system, comprising a spherical display structure, characterized in that: The spherical display structure is the spherical display structure according to any one of claims 1 to 8.

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