Stereoscopic image display device

Abstract

The present invention discloses a stereoscopic image display device, which includes: a flat display unit, a lens array unit, and a light guide structure unit. The light guide structure unit includes a light guide microstructure. The light guide microstructure is arranged on one side of the lens array unit. The bottom angle of the light guide microstructure is defined as B, and the bottom side length of the light guide microstructure is defined as P. In addition, the bottom angle B and the bottom side length P of the light guide microstructure meet the following conditions: (i) 15.5 degrees ≤ B ≤ 83.5 degrees; and (ii) 10 microns ≤ P ≤ 2,000 microns, so that the oblique viewing angle of the stereoscopic image display device falls within the range of 10 degrees to 60 degrees. Thereby, the stereoscopic image display device can provide a better oblique viewing angle, so that the user can watch a good quality stereoscopic image at the oblique viewing angle.

Description

Technical Field

[0001] The present invention relates to a stereoscopic image display device, and more particularly to a stereoscopic image display device that can provide users with a 3D image viewing angle. Background Art

[0002] Although conventional 3D image display devices can provide users with 3D images at oblique viewing angles by providing light guide elements, the light guide structure design of conventional 3D image display devices still needs to be improved to enable users to view high-quality 3D images at oblique viewing angles.

[0003] In summary, the inventors feel that the above-mentioned deficiencies can be improved, and therefore have devoted themselves to research and applied scientific theories, and finally proposed a reasonable design and effective improvement of the present invention. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a stereoscopic image display device to address the deficiencies of the prior art.

[0005] In order to solve the above-mentioned technical problems, one of the technical solutions adopted by the present invention is to provide a three-dimensional image display device, which includes: a flat display unit having a display surface; a lens array unit including at least one focusing lens, and the focusing lens is arranged on one side of the display surface of the flat display unit; and a light guide structure unit including at least one light guide microstructure, and the light guide microstructure is arranged on the side of the lens array unit away from the flat display unit, or is arranged between the flat display unit and the lens array unit; wherein a bottom angle (bottom angle) of the light guide microstructure is defined as B, and a bottom side length (pitch) of the light guide microstructure is defined as P, and the bottom angle B and the bottom side length P of the light guide microstructure satisfy the following conditions: (i) 15.5 degrees ≤ B ≤ 83.5 degrees; and (ii) 10 microns ≤ P ≤ 2,000 microns, so that an oblique viewing angle of the three-dimensional image display device falls within the range between 10 degrees and 60 degrees.

[0006] Preferably, the light-guiding microstructure is a prism structure, the base angle of the light-guiding microstructure is the base angle of the prism structure, and the bottom side length of the light-guiding microstructure is the bottom side length of the prism structure.

[0007] Preferably, the bottom angle of the light-guiding microstructure is designed according to the following formula:

[0008]

[0009] Among them, B is the bottom angle of the light-guiding microstructure; Nd is the refractive index of the light-guiding microstructure itself; Nout is the refractive index of the light beam penetrating the medium after being emitted from the light-guiding microstructure; ILmax is the maximum brightness angle of the light beam incident on the light-guiding microstructure; and OLmax is the maximum brightness angle of the light beam exiting the light-guiding microstructure.

[0010] Preferably, Nd is between 1.40 and 1.65, Nout is between 1.0 and 2.0, and ILmax is between -60 degrees and +60 degrees; wherein the base angle B is designed according to the formula described above and falls between 15.5 degrees and 83.5 degrees, so that OLmax falls within the oblique viewing angle range of 10 degrees to 60 degrees.

[0011] Preferably, Nd is between 1.45 and 1.60, Nout is between 1.0 and 2.0, and ILmax is between -60 degrees and +60 degrees; wherein the base angle B is designed according to the formula described above and falls between 16.5 degrees and 79.5 degrees, so that OLmax falls within the oblique viewing angle range of 10 degrees to 60 degrees.

[0012] Preferably, in the light guide structure unit, a tip of the light guide microstructure is arranged toward the display surface; or, the tip of the light guide microstructure is arranged toward a direction away from the display surface.

[0013] Preferably, the number of at least one of the light-guiding microstructures is multiple, and the bottom angles of the multiple light-guiding microstructures are defined as the first bottom angle to the Nth bottom angle from a position close to a user toward a position away from the user, and the first bottom angle to the Nth bottom angle show an increasing change in the range of 15.5 degrees to 83.5 degrees.

[0014] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a stereoscopic image display device, which includes: a flat display unit having a display surface; a pinhole array unit including a body and at least one pinhole extending through the body, and the pinhole array unit is disposed on one side of the display surface of the flat display unit; and a light guide structure unit including at least one light guide microstructure, and the light guide microstructure is disposed on a side of the pinhole array unit away from the flat display unit, or between the pinhole array unit and the lens array unit; wherein a bottom angle of the light guide microstructure is defined as B, and a bottom side length (pitch) of the light guide microstructure is defined as P, and the bottom angle B and the bottom side length P of the light guide microstructure satisfy the following conditions: (i) 15.5 degrees ≤ B ≤ 83.5 degrees; and (ii) 10 microns ≤ P ≤ 2,000 microns, so that an oblique viewing angle of the stereoscopic image display device falls within the range of 10 degrees to 60 degrees.

[0015] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a 3D image display device, comprising: a flat display module, comprising: a liquid crystal panel and a backlight unit; wherein the liquid crystal panel has a display surface, and the backlight unit is configured to project a light beam, and the liquid crystal panel can allow the light beam to pass through; and a light guide structure unit, comprising at least one light guide microstructure, and the light guide microstructure is disposed on a side of the liquid crystal panel away from the backlight unit, or disposed between the liquid crystal panel and the backlight unit; wherein a bottom angle of the light guide microstructure is defined as B, and a bottom side length (pitch) of the light guide microstructure is defined as P, and the bottom angle B and the bottom side length P of the light guide microstructure satisfy the following conditions: (i) 15.5 degrees ≤ B ≤ 83.5 degrees; and (ii) 10 micrometers ≤ P ≤ 2,000 micrometers, so that an oblique viewing angle of the 3D image display device falls within the range of 10 degrees to 60 degrees.

[0016] Preferably, the liquid crystal panel selectively turns on pixels that need to be used and turns off pixels that do not need to be used. The backlight unit includes multiple light sources, and the multiple light sources are configured to project the light beams so that the light beams pass through the pixels that need to be used of the liquid crystal panel and are recombined to produce a three-dimensional image.

[0017] The beneficial effect of the present invention is that the 3D image display device provided by the present invention can provide a better oblique viewing angle through the special specifications of "the bottom angle of the light-guiding microstructure" and "the bottom side length (pitch) of the light-guiding microstructure" so that the 3D image display device can provide a better oblique viewing angle, thereby providing a user with good quality 3D images at the better oblique viewing angle.

[0018] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and illustration and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. 1 is a schematic diagram of a 3D image display device according to a first embodiment of the present invention.

[0020] Figure 2 for Figure 1 A partial enlarged schematic diagram of region II.

[0021] Figure 3 for Figure 1 A partial enlarged schematic diagram of region II (b).

[0022] Figure 4 To show the relationship between the bottom angle B of the light-guiding microstructure and the maximum brightness angle OLmax of the light beam exiting the light-guiding microstructure when the refractive index Nd of the light-guiding microstructure is 1.40 and 1.65 respectively.

[0023] Figure 5 To show the relationship between the bottom angle B of the light-guiding microstructure and the maximum brightness angle OLmax of the light beam exiting the light-guiding microstructure when the refractive index Nd of the light-guiding microstructure is 1.45 and 1.60 respectively.

[0024] Figure 6 This is a schematic diagram of the light guide structure unit being placed in a forward direction.

[0025] Figure 7 FIG. 4 is a schematic diagram of a 3D image display device according to a second embodiment of the present invention.

[0026] Figure 8 FIG. 4 is a schematic diagram of a 3D image display device according to a third embodiment of the present invention.

[0027] Figure 9 FIG. 4 is a schematic diagram of a 3D image display device according to a fourth embodiment of the present invention.

[0028] Figure 10 FIG. 4 is a schematic diagram of a 3D image display device according to a fifth embodiment of the present invention.

[0029] Figure 11 FIG. 4 is a schematic diagram of a 3D image display device according to a sixth embodiment of the present invention.

[0030] Figure 12 FIG. 4 is a schematic diagram of a 3D image display device according to a seventh embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following is an explanation of the disclosed embodiments of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted in actual size. It is stated in advance. The following embodiments will further explain the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of protection of the present invention.

[0032] It should be understood that although terms such as "first," "second," and "third" may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. In addition, the term "or" as used herein may include any one or more combinations of the associated listed items, depending on the actual situation.

[0033] [First embodiment]

[0034] See also Figure 1 and Figure 2 As shown, a first embodiment of the present invention provides a stereoscopic image display device 100A. The stereoscopic image display device 100A can be used in fields such as optoelectronics, medical treatment, military, display, education, entertainment, and consumer electronics. The stereoscopic image display device 100A can be, for example, an active floating stereoscopic image display device capable of displaying a stereoscopic image S in a space above the stereoscopic image display device 100A. Furthermore, when in use, the stereoscopic image display device 100A can be placed in any suitable location, such as a desktop, the floor, or a ceiling.

[0035] More specifically, an embodiment of the present invention aims to provide a 3D image display device 100A having a light guide structure with specific specifications, so that a user U can view a 3D image S displayed by the 3D image display device 100A at a preferred oblique viewing angle (OVA), and the 3D image S has good image quality.

[0036] In order to achieve the above purpose, Figure 1 As shown, the 3D image display device 100A provided by the embodiment of the present invention includes: a flat panel display unit 1 , a lens array unit 2 , and a light guide structure unit 3 .

[0037] The flat display unit 1 has a display surface 11 (also called display pixel), and the lens array unit 2 is disposed on one side of the display surface 11 of the flat display unit 1. Figure 1 The lens array unit 2 is arranged on the upper side of the display surface 11.

[0038] The light guide structure unit 3 is arranged on a side of the lens array unit 2 away from the display surface 11. Figure 1 , the light guide structure unit 3 is arranged on the upper side of the lens array unit 2, but the present invention is not limited thereto. For example, Figure 8 The light guide structure unit 3 may also be, for example, provided on a side of the lens array unit 2 adjacent to the display surface 11. In other words, the light guide structure unit 3 may be, for example, provided on the lower side of the lens array unit 2 and located between the display surface 11 and the lens array unit 2.

[0039] When the 3D image display device 100A is in operation, the display surface 11 of the flat display unit 1 is configured to emit a light beam (or light cluster) to generate an integral image. The light beam of the integral image can sequentially pass through the lens array unit 2 and the light guide structure unit 3.

[0040] The lens array unit 2 is configured to refocus the integrated image in the space above the 3D image display device 100A to form a 3D image S. Furthermore, the light guide structure unit 3 is configured to adjust the angle and direction of the light beam in the light field system so that the user U can view the 3D image S at an oblique viewing angle OVA.

[0041] Specifically, the flat panel display unit 1 is used to display patterns using integrated photography technology, and further includes a calculation element (not shown) for executing an algorithm. Furthermore, the integrated image displayed on the display surface 11 of the flat panel display unit 1 is generated by performing calculations and redrawing a flat image, but the present invention is not limited thereto.

[0042] In some embodiments of the present invention, the display surface 11 of the flat panel display unit 1 can be, for example, display pixels of an active flat panel display (APD). For example, the display surface 11 of the flat panel display unit 1 can be display pixels of a smartphone, a tablet computer, or a flat screen. The present invention does not limit the type and structure of the flat panel display unit 1. The flat panel display unit 1 is characterized by being able to control the switching of 3D images to achieve a dynamic image display effect.

[0043] In some embodiments of the present invention, the display surface 11 of the flat panel display unit 1 may be a flat pattern of a passive flat panel display, which can only display static patterns and cannot be arbitrarily modified. For example, the flat panel display unit 1 may be a light box graphics device, a mask engraving device, a printing graphics device, or other devices that can only display static patterns.

[0044] Specifically, the lens array unit 2 includes a base 21 and a plurality of condensing lenses 22 disposed on the base. The condensing lenses 22 are arranged in a matrix or staggered manner, and have the ability to control the light field.

[0045] In some embodiments of the present invention, each of the focusing lenses 22 is made of a material with excellent optical properties. For example, the material of the focusing lenses 22 is at least one selected from the group consisting of glass, poly(methyl methacrylate) (PMMA), polycarbonate (PC), and polyethylene (PE), but the present invention is not limited thereto. As long as the material of the focusing lenses 22 has a light transmittance and a hardness suitable for lens formation, it meets the spirit of the present invention and falls within the scope of protection.

[0046] In some embodiments of the present invention, the focusing lens 22 may be a lens with focusing capability, such as a biconvex lens, a plano-convex lens, or a Fresnel lens. Alternatively, the focusing lens 22 may be a lenticular lens or a parallax barrier.

[0047] The light-guiding structure unit 3 is capable of adjusting the angle and direction of the light beam within the light field system. The light-guiding structure unit 3 comprises a base 31 and a plurality of light-guiding microstructures 32 disposed on the base 31. In this embodiment, the plurality of light-guiding microstructures 32 are arranged in a matrix or staggered pattern, but the present invention is not limited thereto. To enable the user U to view high-quality stereoscopic images S at an optimal oblique viewing angle OVA, each light-guiding microstructure 32 in this embodiment of the present invention is designed according to specific specifications.

[0048] like Figure 2 As shown, a bottom angle of the light guide microstructure 32 is defined as B, and a bottom side length (pitch) of the light guide microstructure 32 is defined as P.

[0049] The bottom angle B and bottom side length P of the light-guiding microstructure 32 satisfy the following conditions: (i) 15.5 degrees ≤ B ≤ 83.5 degrees; and (ii) 10 microns ≤ P ≤ 2,000 microns, so that an oblique viewing angle OVA of the 3D image display device 100A falls within the range of 10 degrees to 60 degrees.

[0050] In this embodiment, the light-guiding microstructure 32 is a prism structure, the base angle B of the light-guiding microstructure 32 is the base angle of the prism structure, and the base length P of the light-guiding microstructure 32 is the base length of the prism structure, but the present invention is not limited thereto.

[0051] According to the above configuration, when the 3D image display device 100A is in operation, the 3D image display device 100A allows a user U to view a floating 3D image S within the range of the oblique viewing angle OVA, and the floating 3D image S has better imaging quality.

[0052] It should be noted that, in the present embodiment, the oblique viewing angle OVA is designed to fall within the range of 10 degrees to 60 degrees. If the user's viewing angle is too small (such as less than 10 degrees), the user's viewing angle will be too close to the forward viewing angle, so that the stereoscopic image viewed by the user does not have a floating feeling. If the user's viewing angle is too large (such as greater than 60 degrees), the user's equivalent viewing area will be too small, so that the stereoscopic image viewed by the user cannot have better imaging quality. Accordingly, the stereoscopic image display device 100A of the embodiment of the present invention is mainly designed with special specifications of the bottom angle B and the bottom side length P of the light-guiding microstructure 32, so that the oblique viewing angle OVA of the stereoscopic image display device 100A falls within the range of 10 degrees to 60 degrees.

[0053] Specifically, the bottom angle of the light-guiding microstructure 32 is designed according to the following formula:

[0054]

[0055] For the optical parameters defined in the above formula, please refer to Figure 3 shown.

[0056] Among them, B is the bottom angle of the light-guiding microstructure (the angle in the light-guiding microstructure exit surface away from the user); Nd is the refractive index of the light-guiding microstructure itself; Nout is the refractive index of the light beam penetrating the medium after exiting from the light-guiding microstructure; ILmax is the maximum brightness angle of the light beam incident on the light-guiding microstructure; and OLmax is the maximum brightness angle of the light beam exiting the light-guiding microstructure.

[0057] In a preferred embodiment of the present invention, the refractive index Nd of the light-guiding microstructure itself is between 1.40 and 1.65, the refractive index Nout of the medium through which the light beam passes after exiting the light-guiding microstructure is between 1.0 and 2.0, and the angle ILmax at which the light beam enters the light-guiding microstructure at maximum brightness is between -60 degrees and +60 degrees. Based on the above configuration, to ensure that the angle OLmax at which the light beam exits the light-guiding microstructure at maximum brightness falls within an oblique viewing angle range of 10 degrees to 60 degrees, and considering that the refractive index Nd of the light-guiding microstructure itself is between 1.40 and 1.65, the base angle B of the light-guiding microstructure is designed according to the above formula to fall between 15.5 degrees and 83.5 degrees.

[0058] like Figure 4 The figure shows the relationship between the base angle B of the light-guiding microstructure and the angle OLmax at which the light beam exits the light-guiding microstructure with the maximum brightness when the refractive index Nd is 1.40 and 1.65 respectively.

[0059] In a particularly preferred embodiment of the present invention, the refractive index Nd of the light-guiding microstructure itself is between 1.45 and 1.60, the refractive index Nout of the medium through which the light beam passes after exiting the light-guiding microstructure is between 1.0 and 2.0, and the angle ILmax at which the light beam enters the light-guiding microstructure at maximum brightness is between -60 degrees and +60 degrees. Based on the above configuration, to ensure that the angle OLmax at which the light beam exits the light-guiding microstructure at maximum brightness falls within an oblique viewing angle range of 10 degrees to 60 degrees, and considering that the refractive index Nd of the light-guiding microstructure itself is between 1.45 and 1.60, the base angle B of the light-guiding microstructure is designed according to the above formula to fall between 16.5 degrees and 79.5 degrees.

[0060] like Figure 5 The figure shows the relationship between the bottom angle B of the light-guiding microstructure and the angle OLmax at which the light beam exits the light-guiding microstructure with the maximum brightness when the refractive index Nd is 1.45 and 1.60 respectively.

[0061] The formula satisfied by the bottom angle B of the light-guiding microstructure 32 can be obtained from the following derivation steps 1 and 2.

[0062] Derivation step 1 is: θ′=arcsin(sin(B-ILmax) / Nd).

[0063] Derivation step 2 is: Substitute θ′ into the following formula:

[0064] OLmax=arcsin((Ndsin(B-θ′)) / Nout)

[0065] After deducing step 2, we can get the following formula:

[0066]

[0067] Specifically, the bottom side length P of the light-guiding microstructure 32 is preferably between 10 micrometers and 2,000 micrometers, and more preferably between 15 micrometers and 1,500 micrometers.

[0068] It is worth mentioning that the bottom side length P of the light-guiding microstructure 32 must be no less than 10 microns, as verified by optical simulation software. If the bottom side length P of the light-guiding microstructure 32 is less than 10 microns, the light field system of the stereoscopic image display device 100A may be seriously degraded due to diffraction and aberration phenomena, so that the quality of the stereoscopic image display is seriously reduced. Furthermore, the light field system of the stereoscopic image display device 100A may be based on the separate arrangement of RGB of the display screen, resulting in more serious dispersion of the stereoscopic image. Accordingly, the bottom side length P of the light-guiding microstructure 32 must be no less than 10 microns in order to effectively avoid aberrations and the above-mentioned diffraction. Among them, the optical simulation software can be, for example: ASAP, Zemax, Light Tools, RSoft, Code v, or TracePro. The aforementioned simulation verification method can be, for example, derived from the diffraction coefficient F formula: Lambda = 550nm. This involves calculating the relationship between the diffraction coefficient F and the distance L (from the light point to the prism) and the distance between the prism and the imaging surface. Based on the base length P (Pitch Prism) of different light-guiding microstructures, the system is calculated as Fraunhofer diffraction, whose diffraction is similar to the far field. The degradation of the image resolution modulation transfer function (MTF) by simulating far-field diffraction fringes can be determined.

[0069] It is worth mentioning that Figure 1 As shown, the light guide structure unit 3 of this embodiment is positioned in reverse. That is, the multiple light guide microstructures 32 of the light guide structure unit 3 are located on the bottom side (near the lens array unit 2), and the tips of the multiple light guide microstructures 32 are facing the lens array unit 2. Furthermore, the base 31 of the light guide structure unit 3 is located on the top side (away from the lens array unit 2), but the present invention is not limited to this.

[0070] For example, if Figure 6 As shown, the light guide structure unit 3 can also be placed in a forward direction. The multiple light guide microstructures 32 of the light guide structure unit 3 are arranged on the upper side (away from the lens array unit 2), the tips of the multiple light guide microstructures 32 are arranged in a direction away from the lens array unit 2, and the base 31 of the light guide structure unit 3 is arranged on the lower side.

[0071] [Second embodiment]

[0072] like Figure 7As shown, the second embodiment of the present invention also provides a 3D image display device 100B. The 3D image display device 100B of this embodiment is substantially the same as the first embodiment, except that the design of the light guide structure unit 3 of the 3D image display device 100B of this embodiment is slightly different from that of the first embodiment.

[0073] More specifically, in the light guide structure unit 3, the base angles of the plurality of light guide microstructures 32 (the angles in the light guide microstructure exit surface away from the user) are defined as the first base angle B1 to the Nth base angle B2 from the position close to the user U toward the position away from the user U. N , and the first base angle B1 to the Nth base angle B N For example, the first base angle B1 can be 15.5 degrees, and the Nth base angle B N It can be 83.5 degrees, for example, and the first base angle B1 to the Nth base angle B N The bottom angle between B2 and B N-1 The angles may be gradually increased from 15.5 degrees to 83.5 degrees, but the present invention is not limited thereto. In an embodiment not shown in the present invention, the first base angle B1 to the Nth base angle B N The bottom angle between B2 and B N-1 The angle may be gradually reduced, for example, between 15.5 degrees and 83.5 degrees.

[0074] It is worth noting that if the 3D image display device 100B uses a large-size panel (e.g., a panel larger than 40 inches), the viewing angles of the 3D image display device 100B at different positions on the panel may vary significantly, resulting in poor image quality of the 3D image S. To address the aforementioned technical issues, the 3D image display device 100B of this embodiment utilizes a gradually varying bottom angle design (B1-BN) in the light guide structure unit 3 to meet the application requirements of large-size panels.

[0075] [Third embodiment]

[0076] like Figure 8 As shown, the third embodiment of the present invention also provides a 3D image display device 100C. The 3D image display device 100C of this embodiment is substantially the same as the first embodiment, except that the light guide structure unit 3 of the first embodiment is disposed on the upper side of the lens array unit 2. Figure 8 As shown, the light guide structure unit 3 of this embodiment is disposed on a side of the lens array unit 2 adjacent to the display surface 11. In other words, the light guide structure unit 3 is disposed on the lower side of the lens array unit 2 and located between the display surface 11 and the lens array unit 2.

[0077] [Fourth embodiment]

[0078] like Figure 9 As shown, the fourth embodiment of the present invention also provides a stereoscopic image display device 100D. The stereoscopic image display device 100D of this embodiment is substantially the same as the first embodiment described above, except that the stereoscopic image display device 100D of this embodiment mainly replaces the lens array unit 2 of the first embodiment with a pinhole array unit 4.

[0079] More specifically, the 3D image display device 100D of this embodiment includes a flat display unit 1 , a pinhole array unit 4 , and a light guide structure unit 3 .

[0080] The pinhole array unit 4 is disposed adjacent to the display surface 11 of the flat display unit 1. That is, the pinhole array unit 4 is disposed above the display surface 11 of the flat display unit 1. The pinhole array unit 4 may, for example, contact the display surface 11 of the flat display unit 1. Alternatively, the pinhole array unit 4 may be spaced apart from the display surface 11 of the flat display unit 1, and the present invention is not limited thereto.

[0081] The flat display unit 1 is disposed at the bottom layer of the stereoscopic image display device 100D. The flat display unit 1 is responsible for displaying a flat image that has not yet been reproduced by light, and the light beams of the flat image can be redistributed and combined through the pinhole array unit 4 to display a reconstructed stereoscopic image.

[0082] The pinhole array unit 4 is disposed between the flat display unit 1 and the light guide structure unit 3. The pinhole array unit 4 has the ability to control the light field. The pinhole array unit 4 is configured to control the angle of light of the three-dimensional object so that the originally unreconstructed two-dimensional image is redistributed and recombined, thereby allowing the user U to view the three-dimensional image S.

[0083] Specifically, the pinhole array unit 4 includes a main body 41 and a plurality of pinholes 42. The main body 41 is made of an opaque material, rendering it opaque. The main body 41 is plate-shaped, and the pinholes 42 are preferably circular holes, but the present invention is not limited thereto. The pinholes 42 are formed on the main body 41 and extend through two opposing side surfaces of the main body 41.

[0084] In some embodiments of the present invention, the distance between each two adjacent pinholes 42 is less than 5 mm, the diameter of each pinhole 42 is less than 1 mm, and each pinhole 42 has a focusing function. The image displayed on the display surface 11 of the flat-panel display unit 1 that has not been reconstructed is configured to be reorganized based on the pinhole principle through a plurality of the pinholes 42 to reassemble into a three-dimensional image S. Each of the pinholes 42 can be hollow. Each of the pinholes 42 can also be provided with a translucent material therein so that the light beam can pass through the plurality of the pinholes 42. The plurality of pinholes 42 can be arranged, for example, in a rectangular or hexagonal shape. That is, the pinholes 42 in each two adjacent columns can be arranged relative to each other or staggered.

[0085] The light guide structure unit 3 is arranged on a side of the pinhole array unit 4 away from the display surface 11. Figure 9 As shown, the light guide structure unit 3 is disposed on the upper side of the pinhole array unit 4 , but the present invention is not limited thereto.

[0086] In general, when the 3D image display device 100D is in operation, the display surface 11 of the flat display unit 1 is configured to emit a light beam to generate an integrated image. The light beam of the integrated image can sequentially penetrate the pinhole array unit 4 and the light guide structure unit 3.

[0087] The pinhole array unit 4 is configured to refocus the integrated image in the space above the 3D image display device 100D to form a 3D image. Furthermore, the light guide structure unit 3 is configured to adjust the angle and direction of the light beam in the light field system so that the user U can view the 3D image S at an oblique viewing angle.

[0088] The light-guiding structure unit 3 is capable of adjusting the angle and direction of the light beam within the light field system. More specifically, the light-guiding structure unit 3 comprises a base 21 and a plurality of light-guiding microstructures 31 disposed on the base 21. To enable the user U to view a high-quality 3D image S at an optimal oblique viewing angle OVA, each light-guiding microstructure 32 in this embodiment of the present invention is designed according to specific specifications.

[0089] The specifications and design of the light guide structure unit 32 are substantially the same as those of the first embodiment, and will not be further elaborated here.

[0090] [Fifth embodiment]

[0091] like Figure 10As shown, the fifth embodiment of the present invention also provides a 3D image display device 100E. The 3D image display device 100E of this embodiment is substantially the same as the fourth embodiment, except that the light guide structure unit 3 of the fourth embodiment is disposed above the pinhole array unit 4. Figure 10 As shown, the light guide structure unit 3 of this embodiment is disposed on the side of the pinhole array unit 4 adjacent to the display surface 11. That is, the light guide structure unit 3 is disposed below the pinhole array unit 4 and between the display surface 11 and the pinhole array unit 4.

[0092] [Sixth embodiment]

[0093] like Figure 11 As shown, the sixth embodiment of the present invention also provides a 3D image display device 100F. The 3D image display device 100F of this embodiment is substantially the same as the first embodiment, except that the 3D image display device 100F of this embodiment mainly adopts a multi-light source mode.

[0094] More specifically, the 3D image display device 100F of this embodiment includes a flat display module 5 and a light guide structure unit 3 disposed on the flat display module 5 .

[0095] The flat panel display module 5 includes a liquid crystal panel 51, a backlight unit 52, and an algorithm unit 53. The liquid crystal panel 51 has a display surface 51a, and the backlight unit 52 is configured to project a light beam such that the light beam passes through the liquid crystal panel 51 and transmits information to the eyes of the user U. In this embodiment, the liquid crystal panel 51 is configured to selectively turn on pixels 511a that are in use and turn off pixels 512a that are not in use using an algorithm.

[0096] The backlight unit 52 includes a plurality of light sources 52a, which may be, for example, LEDs or OLEDs. The plurality of light sources 52a are spaced apart and can function like a pinhole array unit. The plurality of light sources 52a are configured to project light beams such that, after passing through the liquid crystal panel 51, the light beams transmit information to the eyes of the user U. The flat image on the flat display module 5 can be reconstructed into a 3D image S through the plurality of light sources 52a and the liquid crystal panel 51.

[0097] The light guide structure unit 3 is disposed on a side of the display surface 51 a of the liquid crystal panel 51 . In other words, the light guide structure unit 3 is disposed on a side of the liquid crystal panel 51 away from the backlight unit 52 .

[0098] Generally speaking, when the 3D image display device 100F is in operation, the multiple light sources 52a of the backlight unit 52 are configured to emit light beams, which sequentially pass through the liquid crystal panel 51 and the light guide structure unit 3. The liquid crystal panel 51 is configured to refocus the light beams in the space above the 3D image display device 100F to form a 3D image S. Furthermore, the light guide structure unit 3 is configured to adjust the angle and direction of the light beams in the light field system so that the user U can view the 3D image S at an oblique viewing angle OVA.

[0099] The specifications and design of the light guide structure unit 3 are substantially the same as those of the first embodiment, and will not be further elaborated here.

[0100] [Seventh embodiment]

[0101] like Figure 12 As shown, the seventh embodiment of the present invention also provides a stereoscopic image display device 100G. The stereoscopic image display device 100G of this embodiment is substantially the same as the sixth embodiment, except that the light guide structure unit 3 of the sixth embodiment is disposed on one side of the display surface 51a of the liquid crystal panel 51.

[0102] like Figure 12 As shown, the light guide structure unit 3 of this embodiment is disposed between the liquid crystal panel 51 and the backlight unit 52. Accordingly, when the 3D image display device 100G is in operation, the plurality of light sources 521 of the backlight unit 52 are configured to emit light beams, and the light beams sequentially pass through the light guide structure unit 3 and the liquid crystal panel 51.

[0103] The light guide structure unit 3 is configured to adjust the angle and direction of the light beam in the light field system, and the liquid crystal panel 51 is configured to refocus the light beam in the space above the stereoscopic image display device 100G so that the user U can view the stereoscopic image S at the oblique viewing angle OVA.

[0104] [Beneficial Effects of Embodiments]

[0105] The beneficial effect of the present invention is that the 3D image display device provided by the present invention can provide a better oblique viewing angle through the special specifications of "the bottom angle of the light-guiding microstructure" and "the bottom side length (pitch) of the light-guiding microstructure" so that the 3D image display device can provide a better oblique viewing angle, thereby providing a user with good quality 3D images at the better oblique viewing angle.

[0106] The contents disclosed above are only preferred feasible embodiments of the present invention and do not limit the claims of the present invention. Therefore, all equivalent technical changes made using the description and drawings of the present invention are included in the claims of the present invention.

Claims

1. A stereoscopic image display device, characterized in that: The stereoscopic image display device comprises: a flat display unit having a display surface; a lens array unit comprising at least one condenser lens, wherein the condenser lens is disposed on one side of the display surface of the flat display unit; and a light guide structure unit comprising at least one light guide microstructure, wherein the light guide microstructure is disposed on a side of the lens array unit away from the flat panel display unit, or is disposed between the flat panel display unit and the lens array unit; A base angle of the light guide microstructure is defined as B, and a base length of the light guide microstructure is defined as P. The base angle B and the base length P of the light guide microstructure satisfy the following conditions: (i) 15.5 degrees ≤ B ≤ 83.5 degrees; and (ii) 10 micrometers ≤ P ≤ 2,000 micrometers, such that an oblique viewing angle of the 3D image display device falls within a range of 10 degrees to 60 degrees. The bottom angle of the light-guiding microstructure is designed according to the following formula: Wherein B is the base angle of the light-guiding microstructure; Nd is the refractive index of the light-guiding microstructure itself; Nout is the refractive index of the medium after the light beam exits the light-guiding microstructure; ILmax is the maximum brightness angle of the light beam incident on the light-guiding microstructure; and OLmax is the maximum brightness angle of the light beam exiting the light-guiding microstructure; Wherein, Nd is between 1.40 and 1.65, Nout is between 1.0 and 2.0, and ILmax is between -60 degrees and +60 degrees; wherein, the base angle B is designed according to the formula to fall between 15.5 degrees and 83.5 degrees, so that OLmax falls within the oblique viewing angle range of 10 degrees to 60 degrees.

2. The 3D image display device according to claim 1, wherein: The light-guiding microstructure is a prism structure, the bottom angle of the light-guiding microstructure is the bottom angle of the prism structure, and the bottom side length of the light-guiding microstructure is the bottom side length of the prism structure.

3. The 3D image display device according to claim 1, wherein: Nd is between 1.45 and 1.60, Nout is between 1.0 and 2.0, and ILmax is between -60 degrees and +60 degrees; wherein the base angle B is designed according to the formula of claim 1 to fall between 16.5 degrees and 79.5 degrees, so that OLmax falls within the oblique viewing angle range of 10 degrees to 60 degrees.

4. The 3D image display device according to claim 1, wherein: In the light guide structure unit, a tip of the light guide microstructure is arranged toward the display surface; or, the tip of the light guide microstructure is arranged toward a direction away from the display surface.

5. The 3D image display device according to claim 1, wherein: The number of at least one of the light-guiding microstructures is multiple, and the bottom angles of the multiple light-guiding microstructures are defined as a first bottom angle to an Nth bottom angle from a position close to a user toward a position away from the user, and the first bottom angle to the Nth bottom angle increase or decrease within the range of 15.5 degrees to 83.5 degrees.

6. A stereoscopic image display device, characterized in that: The stereoscopic image display device comprises: a flat display unit having a display surface; a pinhole array unit comprising a body and at least one pinhole penetrating the body, wherein the pinhole array unit is disposed on one side of the display surface of the flat display unit; and a light guide structure unit comprising at least one light guide microstructure, wherein the light guide microstructure is disposed on a side of the pinhole array unit away from the flat panel display unit, or between the pinhole array unit and the lens array unit; A base angle of the light guide microstructure is defined as B, and a base length of the light guide microstructure is defined as P. The base angle B and the base length P of the light guide microstructure satisfy the following conditions: (i) 15.5 degrees ≤ B ≤ 83.5 degrees; and (ii) 10 micrometers ≤ P ≤ 2,000 micrometers, such that an oblique viewing angle of the 3D image display device falls within a range of 10 degrees to 60 degrees. The bottom angle of the light-guiding microstructure is designed according to the following formula: Wherein B is the base angle of the light-guiding microstructure; Nd is the refractive index of the light-guiding microstructure itself; Nout is the refractive index of the medium after the light beam exits the light-guiding microstructure; ILmax is the maximum brightness angle of the light beam incident on the light-guiding microstructure; and OLmax is the maximum brightness angle of the light beam exiting the light-guiding microstructure; Wherein, Nd is between 1.40 and 1.65, Nout is between 1.0 and 2.0, and ILmax is between -60 degrees and +60 degrees; wherein, the base angle B is designed according to the formula to fall between 15.5 degrees and 83.5 degrees, so that OLmax falls within the oblique viewing angle range of 10 degrees to 60 degrees.

7. A stereoscopic image display device, characterized in that: The stereoscopic image display device comprises: A flat panel display module comprising: a liquid crystal panel and a backlight unit; wherein the liquid crystal panel has a display surface, the backlight unit is configured to project a light beam, and the liquid crystal panel can allow the light beam to pass through; and a light guide structure unit comprising at least one light guide microstructure, wherein the light guide microstructure is disposed on a side of the liquid crystal panel away from the backlight unit, or is disposed between the liquid crystal panel and the backlight unit; A base angle of the light guide microstructure is defined as B, and a base length of the light guide microstructure is defined as P. The base angle B and the base length P of the light guide microstructure satisfy the following conditions: (i) 15.5 degrees ≤ B ≤ 83.5 degrees; and (ii) 10 micrometers ≤ P ≤ 2,000 micrometers, such that an oblique viewing angle of the 3D image display device falls within a range of 10 degrees to 60 degrees. The bottom angle of the light-guiding microstructure is designed according to the following formula: Wherein B is the base angle of the light-guiding microstructure; Nd is the refractive index of the light-guiding microstructure itself; Nout is the refractive index of the medium after the light beam exits the light-guiding microstructure; ILmax is the maximum brightness angle of the light beam incident on the light-guiding microstructure; and OLmax is the maximum brightness angle of the light beam exiting the light-guiding microstructure; Wherein, Nd is between 1.40 and 1.65, Nout is between 1.0 and 2.0, and ILmax is between -60 degrees and +60 degrees; wherein, the base angle B is designed according to the formula to fall between 15.5 degrees and 83.5 degrees, so that OLmax falls within the oblique viewing angle range of 10 degrees to 60 degrees.

8. The 3D image display device according to claim 7, wherein: The liquid crystal panel selectively turns on pixels that need to be used and turns off pixels that do not need to be used. The backlight unit includes multiple light sources, and the multiple light sources are configured to project the light beams so that the light beams pass through the pixels that need to be used of the liquid crystal panel and are recombined to produce a three-dimensional image.

Images