Floating display device

Abstract

To provide a floating display device.SOLUTION: A floating display device comprises a display light source, an optical imaging sheet, and a microlens array sheet. The microlens array sheet includes a plurality of microlenses arranged in an array. The optical imaging sheet includes a plurality of sub-image units arranged in an array, corresponding to the microlenses. The sub-image units have a plurality of first sub-image units and a plurality of second sub-image units. Each of the first sub-image units has a first main image pattern, each of the second sub-image units has a second main image pattern, and the first main image pattern and the second main image pattern have the same pattern. The second sub-image units are arranged so as to constitute an auxiliary image pattern, at least partial second sub-image units each have a base image pattern, and the base image pattern is located around the second main image pattern.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a floating display device, and more particularly to a floating display device having a wide viewing angle. [Background technology]

[0002] With the progress of display technology, various types of display technology are constantly being developed. Among them, projection display technology continues to become finer, and the application of small microprojection technology is beginning to spread. In recent years, applications of microprojection technology to project images into the air have begun, and the projected image is called a floating image. Since a floating image is projected directly into the air, no display medium such as a screen is required. For this reason, floating display technology is gradually gaining importance, and various applications are expanding.

[0003] In recent years, the spread of diseases has accelerated, and attention has been paid to contact infections through objects in public spaces. Elevator buttons, machine buttons, and touch display screens installed in public spaces are often the medium for transmitting diseases. Pathogens remain after the previous user touches them, and when the next user touches them, they adhere to them and become infected, becoming the next carrier. Since floating display technology does not require direct contact with objects, it is gradually being applied to public objects such as elevator buttons, machine buttons, and touch display screens. Summary of the Invention [Problem to be solved by the invention]

[0004] Floating display technology combines with floating touch technology to achieve the effect of human-machine operation through floating touch, and improve the problem of contact infection. However, current floating display technology mainly projects and displays floating images in front of the user, but the display viewing angle is narrow, and if the user's height or position is far from the front of the floating display device, the displayed image is likely to be incomplete or the image may not be visible, which is inconvenient for the user. Therefore, how to widen the viewing angle of the displayed image so that the user can see the displayed image even when they are far from the front has been a problem that engineers in this field are urgently trying to solve.

[0005] Therefore, the inventors believed that the above-mentioned drawbacks could be improved, and as a result of extensive research, they came to propose the present invention, which rationally and effectively improves the problems.

[0006] The present invention has been made through intensive research by the inventors in consideration of the above problems, and its object is to provide a floating display device that widens the display viewing angle, achieves a display effect at a wide viewing angle, and allows a user to clearly see the displayed image even at an oblique viewing angle. [Means for solving the problem]

[0007] According to one embodiment of the present invention, a floating display device is provided. The floating display device according to the present invention includes a display light source, an optical imaging sheet, and a microlens array sheet. The microlens array sheet is disposed to correspond to the display light source, and the microlens array sheet has a plurality of microlenses arranged in an array. The optical imaging sheet is disposed between the display light source and the microlens array sheet, and the optical imaging sheet has a plurality of sub-image units arranged in an array, each of the sub-image units corresponding to a microlens. The sub-image units include a plurality of first sub-image units and a plurality of second sub-image units. Each of the first sub-image units has a first main image pattern, and each of the second sub-image units has a second main image pattern, and the first main image pattern and the second main image pattern include the same pattern. The second sub-image units are arranged to form an auxiliary image pattern, and at least a portion of the second sub-image units each have a base image pattern, and the base image pattern is located around the second main image pattern.

[0008] In order to achieve the above object, another embodiment of the present invention is a floating display touch device, which includes a display light source, a microlens array sheet, a touch module, and an optical imaging sheet. The microlens array sheet is disposed corresponding to the display light source, and the microlens array sheet has a plurality of microlenses arranged in an array. The touch module is disposed adjacent to the microlens array sheet, and the optical imaging sheet is disposed between the display light source and the microlens array sheet, and the optical imaging sheet has a plurality of sub-image units arranged in an array, each of the sub-image units corresponding to a microlens. The sub-image units include a plurality of first sub-image units and a plurality of second sub-image units. Each of the first sub-image units has a first main image pattern, and each of the second sub-image units has a second main image pattern, and the first main image pattern and the second main image pattern include the same pattern. The second sub-image units are arranged to form an auxiliary image pattern, and at least a portion of the second sub-image units each have a base image pattern, and the base image pattern is located around the second main image pattern. Effect of the Invention

[0009] The present invention is configured as described above and therefore provides the effects described below. Compared with the prior art, the floating display device according to the present invention uses a second sub-image unit arranged to form an auxiliary image pattern. The effect of the auxiliary image pattern is enhanced by increasing the base image pattern around the main image pattern of the second sub-image unit. As the auxiliary image pattern provides an auxiliary display image, the user can view the auxiliary display image even at an oblique viewing angle, thereby achieving the effect of displaying an image at a wide viewing angle and improving the user's usability of the floating display device. The floating display device according to the present invention achieves a display effect having a wide viewing angle by utilizing the wide viewing angle display image described above.

[0010] Other objects, configurations and effects of the present invention will become apparent from the following detailed description of the preferred embodiments of the present invention. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic configuration diagram of a floating display device having a wide viewing angle according to an embodiment of the present invention, seen from the side; [Figure 2A] 1 is a schematic front view of an optical imaging sheet of a floating display device according to an embodiment of the present invention; [Figure 2B] FIG. 2 is a schematic exploded view showing a first sub-image unit and a second sub-image unit in an optical imaging sheet according to an embodiment of the present invention. [Figure 3A] 1 is a schematic diagram showing an enlarged view of a first sub-image unit in an optical imaging sheet according to an embodiment of the present invention; [Figure 3B] 1 is a schematic diagram showing an enlarged view of a second sub-image unit in an optical imaging sheet according to an embodiment of the present invention; [Figure 4] 1 is a schematic diagram illustrating an example of a stereoscopic display using a floating display device having a wide viewing angle according to an embodiment of the present invention. [Figure 5A] 13 is a schematic diagram showing an example of an array arrangement of second sub-image units in an optical imaging sheet according to an embodiment of the present invention. [Figure 5B] 13 is a schematic diagram showing an example of a checkerboard arrangement of second sub-image units in an optical imaging sheet according to another embodiment of the present invention; [Figure 6A] 3 shows a schematic cross-sectional view of an optical imaging sheet in another embodiment of the present invention; [Figure 6B] 3 shows a schematic cross-sectional view of an optical imaging sheet in another embodiment of the present invention; [Figure 6C] 3 shows a schematic cross-sectional view of an optical imaging sheet in another embodiment of the present invention; [Figure 7] FIG. 11 is a schematic enlarged view showing a first sub-image unit and a second sub-image unit in an optical imaging sheet according to another embodiment of the present invention. [Figure 8]13 is a schematic diagram illustrating an example of a stereoscopic display using a floating display device having a wide viewing angle according to another embodiment of the present invention; [Figure 9] 11 is a schematic cross-sectional view illustrating a floating display device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiment, and may take various forms within the technical scope of the present invention. The terms used in this specification are used only for the purpose of describing a specific example, and are not intended to limit the present invention. As used in this specification, the singular forms "a," "one," and "said" all include the plural form and "at least one" unless otherwise clearly indicated. As used in this specification, the term "a" includes any combination of one or more associated items.

[0013] In each embodiment of the present invention, the terms "upper", "lower", "left", "right", "front" and "rear" are used in this specification to describe the relationship between one component and another component, and are used only to describe the orientation shown in the drawings, and do not limit the actual position. The orientation and direction of the components of the device in the accompanying drawings are not limited even if the device is inverted.

[0014] First, an embodiment of a floating display device according to the present invention will be described with reference to FIGS.

[0015] FIG. 1 is a schematic side view of a floating display device having a wide viewing angle according to an embodiment of the present invention. As shown in the figure, the floating display device 100 having a wide viewing angle according to the present invention includes a display light source 200, an optical imaging sheet 300, and a micro-lens array sheet (Micro-Lens The display light source 200 includes at least a microlens array (MLA) 400. In this embodiment, the display light source 200 is, for example, a flat light source, and corresponds to the optical imaging sheet 300 and the microlens array sheet 400, and is used to provide light necessary for displaying a wide viewing angle image. The display light source 200 provides visible light such as white light (W), blue light (B), green light (G), red light (R), or a mixture of these light, and adjusts the wavelength range of the light according to the demand of the product, but the present invention is not limited thereto. The display light source 200 is, for example, an LED (Light Emitting Diode), an organic LED (Organic Light Emitting Diode), an organic light emitting diode (LED), an organic light emitting diode (OLED), an organic light emitting diode (OLED), an organic light emitting diode (OLED), an organic light emitting diode (OLED), an organic light emitting diode (OLED), an organic light emitting diode (OLED), an organic light emitting diode (LED ... The display light source 200 may be a OLED (Light Emitting Diode), but the present invention is not limited to these. The display light source 200 is not limited to one, and a plurality of display light sources may be arranged in an array to increase the uniformity of the light source. In addition, various optical sheets such as a light diffusion sheet and an optical light guide plate are combined to achieve the effect of making the light source uniform.

[0016] In the example of FIG. 1, the microlens array sheet 400 of the present invention is installed to correspond to the display light source 200 and is used to form and adjust a floating image. The microlens array sheet 400 has a plurality of microlenses 402u arranged in an array, and may be, for example, an array of M×N (M>1, N>1) microlenses 402u. The number of microlenses 402u determines the definition and three-dimensionality of the floating display screen, and the array of microlenses 402u uses, for example, an array of 40×40 microlenses 402u to provide a high-definition floating display image. The microlenses 402u adopt, for example, biconvex microlenses to enhance the focusing effect of the image as shown in FIG. 1, but the present invention is not limited thereto. The microlenses 402u may use single convex microlenses, single concave microlenses, double concave microlenses, convex and concave microlenses, etc., and combinations thereof, and the present invention is not limited thereto. In addition, the microlens array sheet 400 is not limited to a single sheet, but may be a combination of double sheets or multiple sheets to adjust the imaging effect. This technology is familiar to those skilled in the art, so the description thereof will not be repeated here.

[0017] The material of the microlens array sheet 400 includes, but is not limited to, a transparent plastic material, a transparent glass material, a transparent ceramic material, and a combination thereof. Examples of the transparent plastic material include polyamide (PA), polyimide (PI), polycarbonate (PC), polyurethane (PU), polyethyleneimine (PEI), polyethylene naphthalate (PEI), and the like. The transparent glass material may be, for example, poly(ethylene terephthalate; PEN), polyethylene terephthalate (PET), polyethersulfone (PES), fiber reinforced plastics (FRP), poly(methyl methacrylate; PMMA), polyetheretherketon (PEEK), polydimethylsiloxane (PDMS), or other acrylate polymers, ether polymers, polyolefin polymers, epoxy resin polymers, or other suitable materials or combinations of the above-mentioned materials, but the present invention is not limited thereto. The transparent glass material may be, for example, soda lime glass, borosilicate glass, lead glass, quartz glass, reinforced glass, or other combinations of the above-mentioned materials, but the present invention is not limited thereto. Examples of transparent ceramic materials include, but are not limited to, transparent aluminum oxide, transparent aluminum nitride, transparent silicon oxide, transparent silicon nitride, and the like, as well as combinations of the aforementioned materials.

[0018] 1, the optical imaging sheet 300 is disposed between the display light source 200 and the microlens array sheet 400, and is used to form a pattern required for a floating display image. The optical imaging sheet 300 has a plurality of sub-image units arranged in an array (described in detail later), and may be, for example, an array of M×N (M>1, N>1) sub-image units, each of which corresponds to a microlens 402u.

[0019] The floating display device 100 according to the present invention achieves the effect of displaying at a wide viewing angle. The display light source 200, the optical imaging sheet 300, and the microlens array sheet 400 of the floating display device 100 project images to form a floating display image 1000. When a user views the floating display image 1000 generated by the floating display device 100 from the front at a first viewing angle V1, the image is located within the range of the field of view (FOV) of the normal view, so that the floating display image 1000 can be observed well, but is limited within the angle range of the visible angle θ1. For example, the vertical normal direction of the center of the plane of the optical imaging sheet 300 is 0 degrees (not shown), and based on the limit of the visible angle of the product, the visible angle θ1 may be, for example, ±25 degrees. This visible angle θ1 limits the angle of observation of the user and also limits the application range of the product. The present invention has a wide viewing angle floating display device 100, further provides an auxiliary image (described later), and expands the visible angle to a visible angle θ2, for example, to ±50 degrees. The user can observe the auxiliary display image even from the second viewing angle V2 and the third viewing angle V3, and the auxiliary visible angles α1 (+25 degrees to +50 degrees) and α2 (-25 degrees to -50 degrees) are increased. Although the above description has been given using examples of two distant viewing angles, one above and one below, the auxiliary display image increases a stereoscopic viewing angle, and when the user moves away from the first viewing angle V1, the display image can be viewed in any direction, up, down, left, or right, and is not limited as in the example described in FIG. 1. In the prior art, the image could only be observed at a small visible angle θ1 of the first viewing angle V1, but the present invention provides an auxiliary display image to expand the visible angle θ2, increasing the distant visible angles α1 and α2, so that the user can observe the auxiliary display image even from the second viewing angle V2 and the third viewing angle V3. Therefore, the floating display device 100 according to the present invention broadens the application range of the floating display technology and improves the user's viewing experience of the floating display device.

[0020] FIG. 2A is a schematic front view of the optical imaging sheet of the floating display device according to an embodiment of the present invention. FIG. 2B is a schematic exploded view of the first sub-image unit and the second sub-image unit in the optical imaging sheet according to an embodiment of the present invention. As shown in FIG. 1, FIG. 2A and FIG. 2B, in this embodiment, the floating display image 1000 according to the present invention is described only by taking the pattern of "upward arrow" as an example, and a person skilled in the art can adjust the image displayed by the floating display image 1000 according to the needs of the product. The optical imaging sheet 300 according to the present invention has a plurality of sub-image units 302u arranged in an array, for example, may be an array arrangement of M×N (M>1, N>1) sub-image units 302u, which is used to form a required pattern in the floating display image 1000. The number of sub-image units 302u determines the definition and stereoscopic effect of the floating display screen, and the array of the sub-image units 302u, for example, uses an array of 40×40 sub-image units 302u to provide a high-definition floating display image. Each of the sub-image units 302u corresponds to a microlens 402u, and the arrayed sub-image units 302u constitute an image pattern layer 302. The arrayed sub-image units 302u include a plurality of first sub-image units 310u and a plurality of second sub-image units 320u, and the plurality of second sub-image units 320u are arranged to constitute an auxiliary image pattern 330.

[0021] In the example of FIG. 2B, the arrayed sub-image units 302u are divided into two parts, a part shown in the upper right corner of the rear and a part shown in the lower left corner of the front, based on the arrangement of the plurality of first sub-image units 310u and the plurality of second sub-image units 320u. The part shown in the upper right corner is a pattern formed by arranging the plurality of first sub-image units 310u, and the middle blank part is a blank displayed by removing the second sub-image units 320u. The part shown in the lower left corner is a pattern in which the plurality of second sub-image units 320u are arranged, and the middle part is arranged to form an auxiliary image pattern 330, forming an auxiliary pattern required for a wide viewing angle display image, and the peripheral blank part is a blank displayed by removing the first sub-image units 310u.

[0022] FIG. 3A is a schematic diagram of an enlarged view of a first sub-image unit 310u in an optical imaging sheet according to an embodiment of the present invention. FIG. 3B is a schematic diagram of an enlarged view of a second sub-image unit in an optical imaging sheet according to an embodiment of the present invention. FIG. 4 is a schematic diagram of an example of a stereoscopic display by a floating display device having a wide viewing angle according to an embodiment of the present invention. This embodiment is similar to the embodiment of FIG. 1 to FIG. 2B described above, and the same reference numerals are used for cross-reference, but the present invention is not limited thereto. As shown in FIG. 1, FIG. 2A and FIG. 3A, each of the first sub-image units 310u has a first main image pattern 312 on the inside thereof, which corresponds to the pattern of the floating display image 1000. Taking the sub-image units 302u arrayed in 40×40 as an example, the length of each of the first sub-image units 310u is, for example, 1 / 40 of the length of the floating display image 1000, and the first main image patterns 312 corresponding to the first sub-image units 310u are projected by the plurality of first sub-image units 310u, thereby improving the definition of the floating display image 1000. As shown in FIG. 3A, the first sub-image units 310u arrayed in M×N are enlarged to become the first sub-image units 310u arrayed in 4×4, so that each of the first sub-image units 310u has the first main image pattern 312, and the surplus part becomes the first surplus pattern 316. When the area is enlarged to become the first sub-image units 310u of 1×1, the first main image pattern 312 becomes a downward arrow pattern (see FIG. 3A). In this embodiment, the first main image pattern 312 is described as a light blocking pattern, and the first redundant pattern 316 is an opposite light transmitting pattern, the middle of the pattern of the projected floating display image 1000 is a light blocking dark upward arrow pattern, and the corresponding periphery is a light transmitting bright color (see FIG. 4). The first main image pattern 312 determines the orientation of the first main image pattern 312 according to the projection system of the microlens 402u. The microlens 402u is exemplified as a biconvex lens, and by projecting the image as an enlarged real image, the first main image pattern 312 is an opposite downward arrow pattern corresponding to the pattern of the floating display image 1000, and rotates 180 degrees downward along the projection plane.In this way, the pattern of the floating display image 1000 after the first main image pattern 312 is projected will be a corresponding upward arrow pattern. The above is merely an example, and those skilled in the art can make modifications to suit the projection system, for example, the first main image pattern 312 can be an upward arrow pattern, and the pattern of the floating display image 1000 after the projection can be a corresponding upward arrow pattern, and the present invention is not limited thereto. This technology is familiar to those skilled in the art, so the description will not be repeated here.

[0023] 1, 2A, 3A and 3B, in this embodiment, each of the second sub-image units 320u has a second main image pattern 322 and a base image pattern 324 on the inside, and the excess part is a second excess pattern 326. A plurality of second sub-image units 320u are arranged to form an auxiliary image pattern 330 (see FIG. 3B). The left side of FIG. 3B shows an upward arrow, which forms a pattern required for a wide viewing angle display image. Each of the second sub-image units 320u has, for example, the same length as the first sub-image unit 310u, and the second main image pattern 322 on the inside has, for example, the same length as the first main image pattern 312, but the present invention is not limited thereto. The first main image pattern 312 and the second main image pattern 322 have the same pattern, and the second main image pattern 322 has a similar function to the first main image pattern 312. By projecting the second main image pattern 322, the resolution of the floating display image 1000 is improved.

[0024] In this embodiment, the second sub-image units 320u arranged in M×N are enlarged to be arranged in 4×4, so that each of the second sub-image units 320u has the second main image pattern 322 and the base image pattern 324, and the surplus part is the second surplus pattern 326 (see FIG. 3B). When the area is enlarged to be 1×1 second sub-image units 320u, the second main image pattern 322 becomes a downward arrow pattern. The second main image pattern 322 is similar to the first main image pattern 312, and the second main image pattern 322 and the base image pattern 324 are described as light-shielding patterns, and the surplus second surplus pattern 326 is an opposite light-transmitting pattern, so that the middle of the pattern of the projected floating display image 1000 becomes a light-shielding dark upward arrow pattern, and the corresponding periphery becomes a light-transmitting light-transmitting light color (see FIG. 4). The second main image pattern 322 determines the orientation of the second main image pattern 322 according to the projection system of the microlens 402u. The microlens 402u is exemplified as a biconvex lens, and projects the image as an enlarged real image, so that the second main image pattern 322 becomes an opposite downward arrow pattern corresponding to the pattern of the floating display image 1000, and rotates downward 180 degrees along the projection plane. In this way, the pattern of the floating display image 1000 after the second main image pattern 322 is projected becomes a corresponding upward arrow pattern. The above is only an example, and a person skilled in the art can make modifications suitable for the projection system to make the second main image pattern 322 an upward arrow pattern, and the pattern of the floating display image 1000 after projection becomes a corresponding upward arrow pattern, but the present invention is not limited thereto. This technology is familiar to a person skilled in the art, so the description will not be repeated here. In this embodiment, the first main image pattern 312 and the second main image pattern 322 have the same pattern, and a floating display image 1000 viewed from the front at a first viewing angle V1 is displayed after projection (see FIG. 1 and FIG. 4).

[0025] As shown in Fig. 1 to Fig. 3B, in this embodiment, the base image pattern 324 of the second sub-image unit 320u is located around the second main image pattern 322, for example, the base image pattern 324 surrounds the second main image pattern 322, enhancing the display effect of the base image pattern 324, but the present invention is not limited thereto. The base image pattern 324 may be provided with only a half pattern, for example, only on the right side or right side, or only on the four sides or four corners (not shown). By adjusting the pattern area ratio of the base image pattern 324, the light-shielding grayscale effect of the auxiliary image pattern 330 is correspondingly adjusted, and the brightness of the auxiliary display image at an oblique viewing angle is correspondingly adjusted. In this embodiment, the plurality of second sub-image units 320u are arranged to form an auxiliary image pattern 330, and the auxiliary image pattern 330 and the first main image pattern 312 have the same or similar patterns, so that the auxiliary image pattern 330 and the floating display image 1000 have the same or similar patterns, and after the auxiliary image pattern 330 is projected, auxiliary display images viewed from oblique viewing angles such as the second viewing angle V2 and the third viewing angle V3 are displayed (see FIGS. 1 and 4). .

[0026] As shown in FIG. 1 to FIG. 4, the floating display device with wide viewing angle in FIG. 1 is displayed only by the optical imaging sheet 300, which is the key in FIG. 4. The optical imaging sheet 300 has a first main image pattern 312, a second main image pattern 322, and an auxiliary image pattern 330. The floating display device 100 of the present invention achieves a wide viewing angle display effect. When a user looks at the floating display image 1000 generated by projecting the first main image pattern 312 and the second main image pattern 322 in the optical imaging sheet 300 of the floating display device 100 from the front of the first viewing angle V1, the floating display image 1000 is located within the range of the field of view (FOV) 1200 of the normal view, so that the floating display image 1000 can be observed well, but is limited within the angle range of the visible angle θ1. For example, the vertical normal direction of the center of the plane of the optical imaging sheet 300 is 0 degrees (not shown), and due to the limit of the visible angle of the product, the visible angle θ1 is, for example, ±25 degrees. This visible angle θ1 limits the angle at which the user can view the image, and also limits the range of application of the product. The floating display device 100 with a wide viewing angle of the present invention further provides an auxiliary display image formed by projecting the auxiliary image pattern 330 in the optical imaging sheet 300, and expands the visible angle to a visible angle θ2, for example, to ±50 degrees. The user can view the auxiliary display image from either the second viewing angle V2 (+25 degrees to +50 degrees) above or the third viewing angle V3 (-25 degrees to -50 degrees) below, and thus the auxiliary visible angles α1 and α2 are increased. However, since the increased auxiliary display image is a stereoscopic viewing angle, the user can view the display image even if the user is away from the first viewing angle V1 that the user views directly, or in any direction, including up, down, left, or right, and is not subject to the limitations described in the example of FIG. 4. In the prior art, the first viewing angle V1 can only be observed from a small visible angle θ1, whereas the present invention provides an auxiliary display image to expand the visible angle to θ2, and increases the distant visible angles α1 and α2, allowing the user to view the auxiliary display image from a distant second viewing angle V2 and a third viewing angle V3. In this way, the floating display device 100 having a wide viewing angle according to the present invention expands the application range of the floating display technology and improves the user's feeling of viewing the floating display device.In addition to the upward arrow pattern shown in the example of Figure 4, the optical imaging sheet 300 may use various other different patterns, such as a number pattern, a direction pattern, a switch pattern, a character pattern, etc., and the floating display image 1000 forms a corresponding pattern, but the present invention is not limited to these and the description thereof will not be repeated here.

[0027] 5A is a schematic diagram showing an example of an array arrangement of second sub-image units in an optical imaging sheet according to an embodiment of the present invention. As shown in FIG. 3B and FIG. 5A, an example is described in which a plurality of second sub-image units 320u are arranged in a 6×6 array. In this embodiment, an example is described in which the second main image pattern 322 and the base image pattern 324 are light-shielding patterns, and the remaining second excess patterns 326 are opposite light-transmitting patterns, and each of the second sub-image units 320 has a base image pattern 324, and the base image pattern 324 inside each of the second sub-image units 320u surrounds the second main image pattern 322. Therefore, the auxiliary image pattern 330 has the best light-shielding effect, and when the auxiliary display image is viewed from an oblique viewing angle, the auxiliary image pattern has the darkest gray scale, and the surrounding light-transmitting part has the best display contrast.

[0028] FIG. 5B is a schematic diagram showing an example of the checkerboard arrangement of the second sub-image unit in the optical imaging sheet according to another embodiment of the present invention. The grayscale display effect of the auxiliary image pattern 330 is adjusted according to the needs of the product. In addition to the above-mentioned method of adjusting the pattern area of ​​the single base image pattern 324, the adjustment method can also adjust the ratio of the base image pattern 324 in the auxiliary image pattern 330 to achieve a similar adjustment effect. At least a portion of the second sub-image unit 320ua in the second sub-image unit 320u has the base image pattern 324 (see FIG. 5B). Therefore, the partial second sub-image unit 320ua has the base image pattern 324, and the partial second sub-image unit 320ub does not have the base image pattern 324. Each of the second sub-image units 320ua has a second main image pattern 322, a base image pattern 324, and a second excess pattern 326a, and each of the second sub-image units 320ub has a second main image pattern 322 and a second excess pattern 326b. The second sub-image units 320ua having the base image pattern 324 are arranged, for example, in a checkerboard pattern, and the second sub-image units 320ua and the second sub-image units 320ub are arranged to intersect (see FIG. 5B). The above is an example, and the second sub-image units 320ua having the base image pattern 324 may be arranged in other arrangements, such as an intersect stripe arrangement, an intersect triangle arrangement, an intersect grid arrangement, a intersect scattered arrangement, etc., and the present invention is not limited thereto. By adjusting the ratio of the base image pattern 324 in the auxiliary image pattern 330, the display effect of the auxiliary image pattern 330 can be adjusted, for example, the shading effect can be halved, but the present invention is not limited to this.

[0029] FIG. 6A is a schematic cross-sectional view of an optical imaging sheet 300a according to another embodiment of the present invention. As shown in FIG. 2 and FIG. 6A, a plurality of sub-image units 302u arranged in an array constitute an image pattern layer 302. If the pattern of the image pattern layer 302 allows, the optical imaging sheet 300 may only use the image pattern layer 302. However, if the pattern of the image pattern layer 302 is not continuous, a transparent substrate 304 is additionally provided to improve the stability of the image pattern layer 302. For example, the optical imaging sheet 300a has an image pattern layer 302 and a transparent substrate 304, the transparent substrate 304 has a first surface 3041 and a second surface 3042, and the image pattern layer 302 is disposed on the first surface 3041 of the transparent substrate 304, so that a plurality of sub-image units 302u arranged in an array of the image pattern layer 302 are disposed corresponding to the transparent substrate 304, thereby improving the stability of the sub-image units 302u. 6A, the image pattern layer 302 is displayed as a single layer, and the image pattern layer 302 has different cross-sectional line positions or different patterns, resulting in a disconnected and discontinuous cross-sectional pattern. The first surface 3041 of the transparent substrate 304 faces, for example, the microlens array sheet 400, and the second surface 3042 faces, for example, the display light source 200, and the distance of the projected object and the distance of the image of the floating projection system are appropriately adjusted to form a good floating display image 1000.

[0030] FIG. 6B is a schematic cross-sectional view of an optical imaging sheet according to another embodiment of the present invention. As shown in FIG. 2 and FIG. 6B, in addition to being installed on the first surface 3041 of the transparent substrate 304, the image pattern layer 302 of the optical imaging sheet 300b may also be installed on the second surface 3042 of the transparent substrate 304, and a plurality of sub-image units 302u arranged in an array of the image pattern layer 302 are installed corresponding to the transparent substrate 304, thereby improving the stability of the sub-image units 302u. As shown in FIG. 6B, the image pattern layer 302 is displayed in a single layer, and the image pattern layer 302 has different cross-sectional line positions or different patterns, resulting in a disconnected and non-continuous cross-sectional pattern. The first surface 3041 of the transparent substrate 304 is, for example, opposite to the microlens array sheet 400, and the second surface 3042 is, for example, opposite to the display light source 200, and a good floating display image 1000 can be formed by appropriately adjusting the distance of the projection object and the distance of the image of the floating projection system.

[0031] FIG. 6C is a schematic cross-sectional view of an optical imaging sheet according to another embodiment of the present invention. As shown in FIG. 2 and FIG. 6C, the image pattern layer 302 of the optical imaging sheet 300c is sandwiched inside the transparent substrate 304, so that a plurality of sub-image units 302u arranged in an array of the image pattern layer 302 are arranged to correspond to the transparent substrate 304, and the stability of the sub-image units 302u is improved. In the example of FIG. 6C, the image pattern layer 302 is displayed as a single layer, and the image pattern layer 302 has different cross-sectional line positions or different patterns, so that a disconnected and discontinuous cross-sectional pattern appears. The first surface 3041 of the transparent substrate 304 is, for example, opposite to the microlens array sheet 400, and the second surface 3042 is, for example, opposite to the display light source 200, and a good floating display image 1000 is formed by appropriately adjusting the distance of the projection object and the distance of the image of the floating projection system.

[0032] In this embodiment, the arrayed sub-image units 302u are installed on the transparent substrate 304, i.e., the arrayed sub-image units 302u are installed on one of the first surface 3041 of the transparent substrate 304, the second surface 3042 of the transparent substrate 304, or inside the transparent substrate 304, and there is no restriction on their positions.

[0033] In this embodiment, the material of the transparent substrate 304 includes, but is not limited to, a transparent plastic material, a transparent glass material, a transparent ceramic material, and combinations thereof. Examples of the transparent plastic material include polyamide (PA), polyimide (PI), polycarbonate (PC), polyurethane (PU), polyethyleneimine (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyethersulfone (PES), fiber reinforced plastics (FRP), poly(methyl methacrylate) (PMMA), polyetheretherketon (PEEK), polydimethylsiloxane (PDMS), and the like, or other acrylate polymers, ether polymers, polyolefin polymers, epoxy resin polymers, or other suitable materials or combinations of the above-mentioned materials, but the present invention is not limited thereto. The transparent glass material may be, but is not limited to, soda lime glass, borosilicate glass, lead glass, quartz glass, tempered glass, or a combination of the above materials.The transparent ceramic material may be, but is not limited to, transparent aluminum oxide, transparent aluminum nitride, transparent silicon oxide, transparent silicon nitride, or a combination of the above materials.

[0034] In this embodiment, the material of the image pattern layer 302 (composed of the arrayed sub-image units 302u) is a light-shielding material, for example, a light-shielding plastic material, a light-shielding metal material, or a light-shielding ceramic material, and the light-shielding plastic material may be laminated or a combination of the light-shielding plastic material and the present invention is not limited thereto. The light-shielding plastic material may be, for example, black ink or a light-shielding resin, but the present invention is not limited thereto. The light-shielding metal material may be, for example, metal chromium, molybdenum, aluminum, titanium, zinc, manganese, silver, but the present invention is not limited thereto. The light-shielding ceramic material may be, for example, various metal oxides, metal nitrides, etc., for example, chromium oxide, titanium oxide, chromium nitride, titanium nitride, etc., but the present invention is not limited thereto. The image pattern layer 302 is formed by applying one or multiple layers of the above-mentioned material layers to the transparent substrate 304 by a technique such as coating, deposition, sputtering, etc., and the thickness may be, for example, between 1 μm and 1000 μm, but the present invention is not limited thereto. Then, a desired image pattern layer 302 is formed by a patterning technique such as photolithography and etching, etc. This technique is well known to those skilled in the art, so the description thereof will not be repeated here.

[0035] FIG. 7 is a schematic enlarged view showing a first sub-image unit 1310u and a second sub-image unit 1320u in an optical imaging sheet 1300 according to another embodiment of the present invention. FIG. 8 is a schematic view showing an example of a stereoscopic display by a floating display device having a wide viewing angle according to another embodiment of the present invention. This embodiment is similar to the embodiment of FIG. 1 to FIG. 6C described above, and the same reference numerals are used for cross-reference, but the present invention is not limited thereto. In addition to the light-shielding pattern, in other embodiments, a light-transmitting pattern may be substituted. In the examples of FIG. 1, FIG. 7 and FIG. 8, in other embodiments, the light-transmitting pattern optical imaging sheet 1300 is substituted for the light-shielding pattern optical imaging sheet 300 to achieve other display effects.

[0036] In this embodiment, an example in which the floating display image 1000 is modified to a light-transmitting "upward arrow" pattern will be described (see FIG. 1, FIG. 7, and FIG. 8). The optical imaging sheet 1300 according to the present invention has a plurality of sub-image units 1302u arranged in an array, for example, the sub-image units 1302u are arranged in an array of M×N (M>1, N>1), and are used to form a required pattern in the floating display image 1000a. Taking the sub-image units 1302u arranged in an array of 40×40 as an example, the length of each of the sub-image units 1302u is, for example, 1 / 40 of the length of the floating display image 1000, and the resolution of the floating display image 1000a is improved by projecting and displaying it using the plurality of sub-image units 1302u. Each of the sub-image units 1302u corresponds to a microlens 402u, and the plurality of sub-image units 1302u arranged in an array constitute an image pattern layer 1302. The arrayed multiple sub-image units 1302u include multiple first sub-image units 1310u and multiple second sub-image units 1320u, and the multiple second sub-image units 1320u are arranged to form an auxiliary image pattern 1330, thereby forming the auxiliary pattern required for a wide viewing angle display image.

[0037] 1 and 7, the first sub-image units 1310u each have a first main image pattern 1312 inside, which corresponds to the pattern of the floating display image 1000a. A plurality of first sub-image units 1310u project corresponding first main image patterns 1312, thereby improving the definition of the floating display image 1000a. By enlarging the area of ​​the first sub-image units 1310u to be arranged in a 4×4 pattern, each of the first sub-image units 1310u has the first main image pattern 1312, and the peripheral excess part is the first excess pattern 1316 (see FIG. 7). By enlarging the area to be a 1×1 first sub-image unit 1310u, the first main image pattern 1312 becomes a downward arrow pattern that transmits light. In this embodiment, the first main image pattern 1312 is described as a light-transmitting pattern, and the remaining peripheral first excess pattern 1316 is an opposite light-shielding pattern, so that the middle of the pattern of the projected floating display image 1000a is a light-transmitting light-colored upward arrow pattern, and the corresponding peripheral is a light-shielding dark color (see FIG. 8). The first main image pattern 1312 determines the orientation of the first main image pattern 1312 based on the projection system of the microlens 402u. The microlens 402u is exemplified as a biconvex lens, and the image is projected as an enlarged real image, so that the first main image pattern 1312 becomes an opposite downward arrow pattern corresponding to the pattern of the floating display image 1000a, and rotates 180 degrees downward along the projection plane. In this way, the pattern of the floating display image 1000a after the first main image pattern 1312 is projected becomes the corresponding upward arrow pattern. The above is merely an example, and those skilled in the art can modify the projection system to make the first main image pattern 1312 an upward arrow pattern, and the pattern of the floating display image 1000a after projection to a corresponding upward arrow pattern, and the present invention is not limited thereto. This technology is familiar to those skilled in the art, so the description will not be repeated here.

[0038] 1 and 7, in this embodiment, each of the second sub-image units 1320u has a second main image pattern 1322 and a base image pattern 1324 on the inside, which corresponds to the pattern of the floating display image 1000a. In addition, a plurality of second sub-image units 1320u are arranged to form an auxiliary image pattern 1330, and as shown in the left diagram of FIG. 7, an upward arrow forms a pattern required for a wide viewing angle display image. Each of the second sub-image units 1320u has the same length as the first sub-image unit 1310u, and the second main image pattern 1322 on the inside has the same length as the first main image pattern 1312, but the present invention is not limited thereto. The first main image pattern 1312 and the second main image pattern 1322 have the same pattern, and the functions of the second main image pattern 1322 and the first main image pattern 1312 are similar, and the definition of the floating display image 1000a is improved by projecting the second main image pattern 1322. In this embodiment, the second sub-image unit 1320u is expanded to have a 4×4 arrangement of the second sub-image units 1320u, so that each of the second sub-image units 1320u has the second main image pattern 1322 and the base image pattern 1324, and the surplus portion is the second surplus pattern 1326 (see FIG. 7). When the area is expanded to have a 1×1 second sub-image unit 1320u, the second main image pattern 1322 becomes a light-transmitting downward arrow pattern. The second main image pattern 1322 is similar to the first main image pattern 1312, and the second main image pattern 1322 is taken as an example of a light-transmitting pattern, and the remaining peripheral second surplus pattern 1326 is an opposite light-shielding pattern, so that the middle of the pattern of the projected floating display image 1000a is a light-transmitting upward arrow pattern with a light color, and the corresponding periphery is a light-shielding dark color (see FIG. 8). The second main image pattern 1322 determines the orientation of the second main image pattern 1322 based on the projection system of the microlenses 402u.The microlens 402u is exemplified by a biconvex lens, and the image is projected as an enlarged real image, so that the second main image pattern 1322 becomes a downward arrow pattern corresponding to the pattern of the floating display image 1000a, and rotates downward 180 degrees along the projection plane. In this way, the pattern of the floating display image 1000a after the second main image pattern 1322 is projected becomes a corresponding upward arrow pattern. The above is only an example, and a person skilled in the art can make modifications suitable for the projection system to make the second main image pattern 1322 an upward arrow pattern, and the pattern of the floating display image 1000a after the projection becomes a corresponding upward arrow pattern, and the present invention is not limited thereto. This technology is familiar to a person skilled in the art, so the description will not be repeated here. In this embodiment, the first main image pattern 1312 and the second main image pattern 1322 have the same pattern, and after projection, a floating display image 1000a viewed from the front at a first viewing angle V1 is displayed (see FIG. 8).

[0039] 1 and 7, in this embodiment, the base image pattern 1324 of the second sub-image unit 1320u is located around the second main image pattern 1322, for example, the base image pattern 1324 surrounds the second main image pattern 1322 (see FIG. 7), enhancing the display effect of the base image pattern 1324, but the present invention is not limited thereto. The base image pattern 1324 may be provided with only a half pattern, for example, only on the right side or right side, or on all four sides or four corners (not shown). By adjusting the pattern area ratio of the base image pattern 1324, the light transmission grayscale effect of the auxiliary image pattern 1330 is correspondingly adjusted, and the brightness of the auxiliary display image at an oblique viewing angle is correspondingly adjusted. In this embodiment, a plurality of second sub-image units 1320u are arranged to form an auxiliary image pattern 1330, and after the auxiliary image pattern 1330 is projected, an auxiliary display image viewed from an oblique viewing angle such as the second viewing angle V2 and the third viewing angle V3 is displayed (see FIG. 8). In this embodiment, the second main image pattern 1322 and the base image pattern 1324 are respectively described as light-transmitting patterns. In addition to displaying in black and white gray scale, the first main image pattern 1312, the second main image pattern 1322 and the base image pattern 1324 of the present invention may be provided with a color filter layer (not shown) and may be combined with a white display light source 200 to achieve a color display effect.

[0040] Referring to FIG. 7 and also to FIG. 5A and FIG. 5B, each of the second sub-image units 1320 has a base image pattern 1324, and the base image pattern 1324 inside each of the second sub-image units 1320u surrounds the second main image pattern 1322. In this way, the auxiliary image pattern 1330 has the highest light transmission effect, and when the auxiliary display image is viewed from an oblique viewing angle, the image pattern has the brightest grayscale, and the peripheral light-shielding part has the highest display contrast. The grayscale display effect of the auxiliary image pattern 1330 can be adjusted by adjusting the ratio of the base image pattern 1324 in the auxiliary image pattern 1330 according to product needs. The arrangement of the second sub-image units 1320u having the base image pattern 1324 may be, for example, a checkerboard pattern arrangement, a stripe interlaced arrangement, a triangle interlaced arrangement, a grid interlaced arrangement, a scattered interlaced arrangement, etc., and the present invention is not limited thereto. For detailed adjustment methods, please refer to the above description of FIG. 5A and FIG. 5B.

[0041] 1, 7 and 8, the floating display device with a wide viewing angle in FIG. 1 is displayed only by a key optical imaging sheet 1300 in FIG. 8, replacing the optical imaging sheet 300 in FIG. 1. The optical imaging sheet 1300 has a first main image pattern 1312, a second main image pattern 1322, and an auxiliary image pattern 1330. The floating display device 100 of the present invention achieves the effect of displaying at a wide viewing angle. When a user looks at the floating display image 1000a generated by projecting the first main image pattern 1312 and the second main image pattern 1322 in the optical imaging sheet 1300 of the floating display device 100 from the front of the first viewing angle V1, the floating display image 1000a is located within the range of the field of view (FOV) 1200 of the normal view, so that the floating display image 1000a can be observed well, but is limited within the angular range of the visible angle θ1. For example, the vertical normal direction in the center of the plane of the optical imaging sheet 1300 is 0 degrees (not shown), and the visible angle θ1 is, for example, ±25 degrees based on the limit of the visible angle of the product. This visible angle θ1 limits the user's observation angle and also limits the application range of the product. The floating display device 100 with a wide viewing angle according to the present invention further provides an auxiliary display image formed by projecting an auxiliary image pattern 1330 into the optical imaging sheet 1300, and expands the visible angle to a visible angle θ2, for example, to ±50 degrees. The user can observe the auxiliary display image from either the second viewing angle V2 (+25 degrees to +50 degrees) above or the third viewing angle V3 (-25 degrees to -50 degrees) below, thereby increasing the auxiliary viewing angles α1 and α2. However, since the increased auxiliary display image is a stereoscopic viewing angle, the user can observe the display image in any direction, up, down, left or right, from the first viewing angle V1 in front, and is not limited to the description of the example in FIG. 8. In the prior art, the first viewing angle V1 can only be observed from a small visible angle θ1, but the present invention provides an auxiliary display image, which expands the visible angle to θ2 and increases the distant visible angles α1 and α2, allowing the user to view the auxiliary display image from a distant second viewing angle V2 and a third viewing angle V3. Therefore, the floating display device 100 having a wide viewing angle according to the present invention expands the application range of the floating display technology and improves the user's viewing sensation of the floating display device.In addition to the upward arrow pattern shown in FIG. 8, the floating display image 1000a may use various other different patterns on the optical imaging sheet 1300, such as a number pattern, a direction pattern, a switch pattern, a character pattern, etc., so that the floating display image 1000a forms a corresponding pattern. The present invention is not limited to these, and the description thereof will not be repeated here.

[0042] The floating display device 100 having a wide viewing angle according to the present invention can be applied to various devices, for example, various elevator buttons, machine buttons, machine screens, etc., and the present invention is not limited thereto. In addition, the floating touch is combined to achieve a good floating display touch effect. FIG. 9 is a schematic cross-sectional view illustrating a floating display device according to another embodiment of the present invention. This embodiment is similar to the embodiment of FIG. 1 to FIG. 8 described above, and the same reference numerals are used for cross-reference, but the present invention is not limited thereto. In this embodiment, an elevator button is described as an example, but a technician in this field can apply it to other devices and is not limited to the description of this embodiment.

[0043] In the example of FIG. 9, the floating display device 100a having a wide viewing angle includes at least a display light source 200, an optical imaging sheet 300, and a microlens array sheet 400. The display light source 200 includes, for example, an LED (Light Emitting Diode; LED) 202 and a light diffusion sheet 204. The LED 202 emits light of various required colors such as white light, blue light, green light, red light, etc., and can be adjusted according to product demands. At least one or more LEDs 202 are installed, and may be one LED 202 or a plurality of LEDs 202 may be arranged in an array, but the present invention is not limited thereto. The light diffusion sheet 204 uniformly diffuses the light provided by the LED 202 to form a planar light source, and projects the floating display image 1000 and the auxiliary display image at an oblique viewing angle to form the image.

[0044] In the example of FIG. 9, the optical imaging sheet 300 of the present invention may use the optical imaging sheet 300 with a light-shielding pattern, and may use the optical imaging sheet 1300 with a light-transmitting pattern, and there is no particular limitation. For the optical imaging sheet 300 (or the optical imaging sheet 1300), please refer to the description of the above-mentioned embodiment, and the description will not be repeated here. For the microlens array sheet 400, for example, a biconvex lens is adopted to achieve a good floating projection effect. For the microlens array sheet 400, please refer to the description of the above-mentioned embodiment, and the description will not be repeated here. The display light source 200, the optical imaging sheet 300, and the microlens array sheet 400 project the image, and thus a floating display image 1000 (or a floating display image 1000a) is formed. By appropriately adjusting the projection display system, for example, by adjusting the distance of the projected object and the distance of the image, the angle of the image can be adjusted. For example, the contraction angle β is adjusted to be between about 10 degrees and 45 degrees, and the image angle γ is set to be between about 80 degrees and 45 degrees. By appropriately adjusting the imaging angle, the distance from the floating display image 1000 to the microlens array sheet 400 can be adjusted, for example, between 0.1 cm and 20 cm, to adjust the projection distance of the floating display. According to needs, the projection distance of the floating display can be, for example, between 0.5 cm and 10 cm. The above is for illustrative purposes only and does not limit the projection range of the floating display.

[0045] In the example of FIG. 9, when the floating display device 100a is applied to an elevator button, it may further include a circuit board 600, for example, a printed circuit board may be installed adjacent to the display light source 200. The LED 202 of the display light source 200 may be directly installed on the circuit board 600, for example, to further reduce the space used. The circuit board 600 on the other side of the LED 202 may further include a connector 700 for connecting to the circuit board 600, so that the circuit board 600 is connected to an external control circuit. In addition, as shown in FIG. 9, the floating display device 100a further includes an external case 810 and an internal case 820. The display light source 200, the optical imaging sheet 300, the microlens array sheet 400, the circuit board 600, etc. are installed in the internal case 820 and connected to an external circuit through the connector 700. By locking the external case 810 and the internal case 820, the display light source 200, the optical imaging sheet 300, the microlens array sheet 400, the circuit board 600, etc. are sealed in the storage space between the external case 810 and the internal case 820, and only the transparent substrate of the display projection window of the external case 810 is exposed (not shown), which is close to the microlens array sheet 400 and used to project the floating display image 1000 and the auxiliary display image at an oblique viewing angle, thereby expanding the display viewing angle and achieving a wide-angle display effect, allowing the user to clearly observe the auxiliary display image even from an oblique viewing angle.

[0046] In the example of FIG. 9, the floating display device 100a further includes a touch module 500 installed adjacent to the microlens array sheet 400, forming a floating display touch device. The touch module 500 is, for example, a floating touch module, has a touch sensing area 530, and has a good floating display touch effect in combination with the floating display device 100. The touch module 500 uses non-contact touch technologies such as infrared touch technology, visible light shooting analysis touch technology, and sonic touch technology, and has a good floating touch effect. It is prevented from contacting the surface of an object and becoming a path of infection of pathogens. Taking the infrared touch technology as an example, the touch module 500 includes at least an infrared transmitter 510 and an infrared sensor 520, which are, for example, installed in the external case 810 adjacent to both opposing sides of the microlens array sheet 400 (see FIG. 9). The infrared transmitter 510 and the infrared sensor 520 are, for example, electrically connected to the circuit board 600. The light emission angle range of the infrared transmitter 510 overlaps with the light reception angle range of the infrared sensor 520 to form a touch sensing area 530. The range of the touch sensing area 530 includes the floating display image 1000 (or 1000a). The partial infrared transmitter 510 transmits infrared rays toward the position of the floating display image 1000, and when the user puts his finger into the touch sensing area 530, the infrared rays are reflected by the infrared sensor 520 when the finger approaches the floating display image 1000, and the user's action is detected, thus achieving the floating touch function of the human-machine. In this way, when the user uses the elevator, the effect of floating touching the elevator switch by turning it up is achieved by only touching the floating display image 1000. Since there is no need to touch the elevator button directly, the situation where pathogens are attached to the elevator button is prevented, and the possibility of pathogens being transmitted is reduced. In addition, the infrared transmitter 510 and the infrared sensor 520 are not limited to being installed in the external case 810.The infrared transmitter 510 may be installed at a location other than the outer case 810, for example, at a location above or below the outer case 810, and infrared rays may be transmitted parallel to the floating display image 1000, and the number of infrared sensors 520 installed on the outer case 810 may be increased to increase the sensitivity of touch detection. If the infrared sensor 520 has a high sensitivity, it can directly detect the infrared rays emitted by the user's body, and the infrared sensor 520 may be directly installed on the outer case 810, and the installation of the infrared transmitter 510 may be omitted. The above is merely an example, and a person skilled in the art can achieve the floating touch effect by using an appropriate equivalent replacement, so the description will not be repeated here.

[0047] In summary, in the floating display device of the present invention, the second sub-image units are arranged to form an auxiliary image pattern. The effect of the auxiliary image pattern is enhanced by adding a base image pattern around the main image pattern of the second sub-image unit. The auxiliary display image is provided by the auxiliary image pattern, so that the user can observe the auxiliary display image even from an oblique viewing angle, thereby achieving the effect of displaying an image at a wide viewing angle, and improving the user's experience of using the floating display device. In addition, a floating display touch device with a wide viewing angle is formed by combining with a touch module, which further achieves the effect of floating touch human-machine interaction and suppresses the problem of pathogen transmission caused by direct contact by the user.

[0048] Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is clear to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the description of the claims that such modifications and improvements can also be included in the technical scope of the present invention. [Explanation of symbols]

[0049] 100 Floating display device 100a Floating display device 200 display light source 202 LED 204 Light diffusion sheet 300 Optical imaging sheet 300a Optical imaging sheet 300b Optical imaging sheet 300c Optical Imaging Sheet 302 Image Pattern Layer 302u Sub-image unit 304 Transparent substrate 3041 1st page 3042 2nd page 310u 1st sub-image unit 312 1st main image pattern 316 1st Surplus Pattern 320u Second sub-image unit 322 2nd main image pattern 324 Base Image Pattern 326 Second Surplus Pattern 330 Auxiliary Image Pattern 400 Microlens Array Sheet 402 Micro Lens 500 Touch Module 510 Infrared transmitter 520 Infrared Sensor 530 Touch Sensitive Area 600 Circuit Board 700 Connector 810 External case 820 Inner Case 1000 Floating Display Images 1000a Floating display image 1200 front view 1300 Optical imaging sheet 1302 Image Pattern Layer 1302u Sub-image unit 1310u 1st Sub-Image Unit 1312 1st main image pattern 1316 1st surplus pattern 1320u Secondary Image Unit 1322 2nd main image pattern 1324 Base Image Pattern 1326 Second surplus pattern 1330 Auxiliary image pattern V1 Viewpoint V2 Viewpoint V3 Viewpoint θ1 Angle θ2 Angle α1 Angle α2 Angle β Angle γ Angle

Claims

1. A display light source; a microlens array sheet having a plurality of microlenses arranged in an array so as to correspond to the display light source; an optical imaging sheet disposed between the display light source and the microlens array sheet, the optical imaging sheet having a plurality of sub-image units arranged in an array, each of the sub-image units corresponding to the microlens; The sub-image unit includes: a plurality of first sub-image units each having a first main image pattern; a plurality of second sub-image units each having a second main image pattern, the first main image pattern and the second main image pattern including the same pattern; The floating display device is characterized in that the second sub-image units are arranged to form an auxiliary image pattern, at least a portion of the second sub-image units each have a base image pattern, and the base image pattern is located around the second main image pattern.

2. 2. The floating display device according to claim 1, wherein the display light source comprises at least one LED and a light diffusion sheet.

3. The floating display device according to claim 1 , wherein the microlenses include biconvex microlenses.

4. The floating display device of claim 1 , wherein the first main image pattern, the second main image pattern, and the base image pattern each include a light-blocking pattern.

5. The floating display device of claim 1 , wherein the first main image pattern, the second main image pattern, and the base image pattern each include a light-transmitting pattern.

6. The floating display device of claim 1 , wherein the base image pattern surrounds the second main image pattern.

7. 2. The floating display device of claim 1, wherein each of the second sub-image units has the base image pattern.

8. 2. The floating display device of claim 1, wherein the arrangement of the partial second sub-image units having the base image pattern includes a checkerboard pattern arrangement.

9. The optical imaging sheet further comprises a transparent substrate; 2. The floating display device according to claim 1, wherein the sub-image units arranged in an array are disposed on the transparent substrate.

10. The floating display device of claim 1 , wherein the first main image pattern and the auxiliary image pattern have the same pattern.

11. 2 . The floating display device according to claim 1 , wherein the display light source, the optical imaging sheet, and the microlens array sheet project images to form a floating display image.

12. The touch panel further includes a touch module disposed adjacent to the microlens array sheet, The floating display device of claim 11 , wherein the touch module has a touch sensitive area, and an area of ​​the touch sensitive area includes the floating display image.

13. The floating display device of claim 12 , wherein the touch module comprises an infrared transmitter and an infrared sensor located on both sides of the microlens array sheet.

14. A display light source; a microlens array sheet having a plurality of microlenses arranged in an array so as to correspond to the display light source; a touch module disposed adjacent to the microlens array sheet; an optical imaging sheet disposed between the display light source and the microlens array sheet, the optical imaging sheet having a plurality of sub-image units arranged in an array, each of the sub-image units corresponding to the microlens; These sub-image units are: a plurality of first sub-image units each having a first main image pattern; a plurality of second sub-image units each having a second main image pattern, the first main image pattern and the second main image pattern including the same pattern; The second sub-image units are arranged to form an auxiliary image pattern, at least a portion of the second sub-image units each have a base image pattern, and the base image pattern is located around the second main image pattern.

15. The floating display touch device of claim 14 , wherein the first main image pattern, the second main image pattern, and the base image pattern each include a light-shielding pattern.

16. The floating display touch device as claimed in claim 14 , wherein the first main image pattern, the second main image pattern, and the base image pattern each include a light-transmitting pattern.

17. The floating display touch device of claim 14 , wherein the base image pattern surrounds the second main image pattern.

18. The floating display touch device as claimed in claim 14 , wherein each of the second sub-image units has the base image pattern.

19. The floating display touch device as claimed in claim 14 , wherein the arrangement of the second sub-image units partially having the base image pattern includes a checkerboard pattern arrangement.

20. The optical imaging sheet further comprises a transparent substrate; The floating display touch device as claimed in claim 14 , wherein the sub-image units arranged in an array are disposed on the transparent substrate.

21. The floating display touch device as claimed in claim 14 , wherein the first main image pattern and the auxiliary image pattern have the same pattern.

22. The floating-display touch device as claimed in claim 14 , wherein the display light source, the optical imaging sheet, and the microlens array sheet project an image to form a floating display image.

23. The floating display touch device of claim 22 , wherein the touch module has a touch sensing area, and an area of ​​the touch sensing area includes the floating display image.

24. The floating display touch device as claimed in claim 14 , wherein the touch module comprises an infrared transmitter and an infrared sensor located on both sides of the microlens array sheet.

Images