Display device

Abstract

The present invention discloses a display device, comprising: a substrate, a plurality of supersurface structure groups, a plurality of display elements and a visible light absorption layer. The supersurface structure groups are located on the substrate and have a plurality of openings, wherein each supersurface structure group includes a plurality of supersurface structures. The display elements are respectively located in the openings. The visible light absorption layer covers the supersurface structures.

Description

Technical Field

[0001] The present invention relates to a display device, and in particular to a display device capable of improving 5G millimeter wave coverage. Background Art

[0002] With the commercialization of the fifth generation of mobile communication technology (5G), applications such as telemedicine, VR live broadcast, 4K quality live broadcast, smart home, etc. have new development opportunities. Due to the high data rate, reduced latency, energy saving, cost reduction, increased system capacity and large-scale device connection of 5G, operators in different fields can also form cross-border alliances to jointly create a new generation of 5G ecosystem. However, at the beginning of 5G, how to increase the coverage of 5G millimeter wave with reduced 5G equipment construction costs is an urgent problem to be solved in the industry. Summary of the invention

[0003] The present invention provides a display device capable of improving the coverage of 5G millimeter waves.

[0004] One embodiment of the present invention proposes a display device, comprising: a substrate; a plurality of supersurface structure groups, located on the substrate and having a plurality of openings, wherein each supersurface structure group comprises a plurality of supersurface structures; a plurality of first display elements, respectively located in the openings; and a visible light absorption layer, covering the supersurface structure.

[0005] In one embodiment of the present invention, the visible light absorption layer is filled between the super-surface structure and the first display element.

[0006] In one embodiment of the present invention, the display device further includes a plurality of second display elements located between the metasurface structures.

[0007] In one embodiment of the present invention, the first display elements and the second display elements are arranged in an array.

[0008] In one embodiment of the present invention, the above-mentioned super-surface structure groups are arranged in an array.

[0009] In one embodiment of the present invention, the aforementioned metasurface structure groups are the same as or different from each other.

[0010] In one embodiment of the present invention, the super-surface structures in the above-mentioned super-surface structure groups have the same shape and different sizes.

[0011] In one embodiment of the present invention, the super-surface structures in the above-mentioned super-surface structure groups have the same shape and different orientations.

[0012] In one embodiment of the present invention, the material of the above-mentioned super surface structure includes metal, conductive oxide, conductive polymer, metal nanowire or a combination thereof.

[0013] One embodiment of the present invention provides a display device, comprising: a substrate; a plurality of supersurface structure groups located on the substrate, each supersurface structure group comprising a plurality of supersurface structures; and a plurality of display elements located on the substrate, wherein the display elements are not coplanar with the supersurface structure groups.

[0014] In one embodiment of the present invention, the display element is located between the substrate and the super-surface structure group.

[0015] In one embodiment of the present invention, the display device further includes a visible light absorption layer covering the metasurface structure.

[0016] In one embodiment of the present invention, the display device further includes a planar layer covering the display element and located between the metasurface structure group and the display element.

[0017] In one embodiment of the present invention, the display element at least partially does not overlap the visible light absorbing layer.

[0018] In one embodiment of the present invention, the aforementioned super-surface structure group is located between the substrate and the display element.

[0019] In one embodiment of the present invention, the display device further comprises a visible light absorption layer covering the metasurface structure, and the visible light absorption layer is located between the display element and the metasurface structure group.

[0020] In one embodiment of the present invention, the substrate is located between the super-surface structure group and the display element.

[0021] In one embodiment of the present invention, the aforementioned metasurface structure groups are the same as or different from each other.

[0022] In one embodiment of the present invention, the super-surface structures in the above-mentioned super-surface structure groups have the same shape and different sizes.

[0023] In one embodiment of the present invention, the super-surface structures in the above-mentioned super-surface structure groups have the same shape and different orientations.

[0024] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1A is a schematic plan view of a display device 10 according to an embodiment of the present invention;

[0026] Figure 1B is along Figure 1A A schematic cross-sectional view taken along the section line A-A';

[0027] Figure 1C is a graph showing the phase delay of electromagnetic waves generated by the metasurface structure group 120 of the display device 10;

[0028] Figure 2 is a cross-sectional schematic diagram of a display device 20 according to an embodiment of the present invention;

[0029] Figure 3 is a cross-sectional schematic diagram of a display device 30 according to an embodiment of the present invention;

[0030] Figure 4 is a cross-sectional schematic diagram of a display device 40 according to an embodiment of the present invention;

[0031] Figure 5A is a plan view of a super-surface structure group 520 according to an embodiment of the present invention;

[0032] Figure 5B yes Figure 5A A phase delay curve diagram of the electromagnetic wave generated by the metasurface structure group 520;

[0033] Fig. 6A is a plan view of a super-surface structure group 620 according to an embodiment of the present invention;

[0034] Figure 6B yes Fig. 6A A phase delay curve diagram of the electromagnetic wave generated by the metasurface structure group 620;

[0035] Fig. 7A is a plan view of a super-surface structure group 720 according to an embodiment of the present invention;

[0036] Figure 7B yes Fig. 7A A phase delay curve diagram of the electromagnetic wave generated by the metasurface structure group 720;

[0037] Figure 8 is a schematic plan view of a display device 80 according to an embodiment of the present invention;

[0038] Fig. 9 is a schematic diagram of a super surface structure that can be used in an embodiment of the present invention;

[0039] Fig. 10A is a simulation diagram of a comparative example;

[0040] Fig. 10B It is a simulation diagram of an embodiment of the present invention.

[0041] Explanation of symbols

[0042] 10, 20, 30, 40, 80: Display device

[0043] 101: Front

[0044] 102: Dorsal

[0045] 110: Substrate

[0046] 120, 520, 620, 720, 821, 822, 823, 824: Super surface structure group

[0047] 121, 122, 123: Supersurface structures

[0048] 121a, 122a, 123a: Square ring structure

[0049] 121b, 122b, 123b: Block structure

[0050] 130, 131, 132: Display components

[0051] 140: Visible light absorption layer

[0052] 250: Flat layer

[0053] 521, 522: Super surface structure

[0054] 521a, 522a: Square ring structure

[0055] 521b, 522b: Block structure

[0056] 621, 622, 623, 624: Supersurface structures

[0057] 621a, 622a, 623a, 624a: Square ring structure

[0058] 621b, 622b, 623b, 624b: Block structure

[0059] 721, 722, 723, 724, 725: Supersurface structures

[0060] 721a, 722a, 723a, 724a, 725a: Square ring structure

[0061] 721b, 722b, 723b, 724b, 725b: Block structure

[0062] A-A': Hatch line

[0063] CW, CW': Wire

[0064] DC: driving element

[0065] OP, OR: Open DETAILED DESCRIPTION

[0066] Figure 1A is a schematic plan view of a display device 10 according to an embodiment of the present invention. Figure 1B is along Figure 1A A schematic cross-sectional view taken along the section line AA'. Figure 1C 1 is a graph showing the phase delay of electromagnetic waves generated by the metasurface structure group 120 of the display device 10 .

[0067] Please also refer to Figure 1A and Figure 1B The display device 10 includes: a substrate 110, a plurality of supersurface structure groups 120, a plurality of display elements 131, and a visible light absorption layer 140. The supersurface structure group 120 is located on the substrate 110 and has a plurality of openings OP, wherein each supersurface structure group 120 includes supersurface structures 121, 122, and 123. The display elements 131 are respectively located in the openings OP. The visible light absorption layer 140 covers the supersurface structures 121, 122, and 123.

[0068] Based on the above, in a display device 10 of an embodiment of the present invention, a metasurface structure group 120 is provided to control the phase delay of the electromagnetic wave, so that beam steering of the electromagnetic wave can be achieved, so that the display device 10 helps to extend the transmission distance of the electromagnetic wave and can improve the coverage of 5G millimeter waves without adding 5G equipment.

[0069] Hereinafter, the implementation of each component of the display device 10 will be described in conjunction with the accompanying drawings. Figure 1A The substrate 110 of the display device 10 can be used to carry the metasurface structure group 120 and the display element 131. The material of the substrate 110 can be flexible or inflexible, such as glass, ceramic, quartz, metal, polyimide (PI), polycarbonate (PC), composite material or other appropriate materials, but the present invention is not limited thereto.

[0070] The supersurface structure group 120 may include a plurality of supersurface structures constituting a minimum repeating unit on the substrate 110. For example, in this embodiment, the supersurface structures 121, 122, and 123 constitute a minimum repeating unit on the substrate 110, and therefore, the supersurface structure group 120 may include the supersurface structures 121, 122, and 123.

[0071] Since the metasurface structures 121, 122, 123 of different sizes have different resonant frequencies, when electromagnetic waves of a specific frequency are incident on the metasurface structures 121, 122, 123, the metasurface structures 121, 122, 123 will generate induced currents with different phase delays, thereby changing the phase of the reflected electromagnetic waves. In this way, the phase delay of the induced current can be controlled by controlling the size of the metasurface structures 121, 122, 123, thereby adjusting the emission angle of the electromagnetic waves to steer the electromagnetic waves.

[0072] The multiple groups of super surface structure groups 120 disposed on the substrate 110 may be identical to each other or different from each other. For example, in this embodiment, the display device 10 may include multiple groups of super surface structure groups 120 that are identical to each other, that is, the super surface structure groups 120 may have the same shape, size, orientation, etc., but the present invention is not limited thereto. However, in some embodiments, the display device 10 may include multiple groups of super surface structure groups that are different from each other.

[0073] The super surface structure group 120 can be arranged on the substrate 110 in an array. Figure 1A In the illustrated embodiment, the four supersurface structure groups 120 may be arranged on the substrate 110 in a 2×2 matrix, but the present invention is not limited thereto. In some embodiments, the four supersurface structure groups 120 may also be arranged on the substrate 110 in a 1×4 or 4×1 matrix.

[0074] The supersurface structures 121, 122, and 123 in the supersurface structure group 120 may have the same shape but different sizes. For example, in the present embodiment, the supersurface structure 121 of the supersurface structure group 120 may include a square ring structure 121a and a square structure 121b; the supersurface structure 122 may include a square ring structure 122a and a square structure 122b; and the supersurface structure 123 may include a square ring structure 123a and a square structure 123b. The square ring structures 121a, 122a, and 123a have the same shape, and the size of the square ring structure 121a is larger than the size of the square ring structure 122a, and the size of the square ring structure 122a is larger than the size of the square ring structure 123a, that is, the sizes of the square ring structures 121a, 122a, and 123a are in a decreasing relationship. In addition, the shapes of the block structures 121b, 122b, and 123b are the same, and the sizes of the block structures 121b, 122b, and 123b are also in a decreasing relationship. It should be noted that the shapes of the super surface structures 121, 122, and 123 are not limited to the following. Figure 1A The shown combination of the square ring structures 121a, 122a, 123a and the square block structures 121b, 122b, 123b, and the size variation of the metasurface structures 121, 122, 123 can also be individually varied or combined in terms of their three-dimensional sizes.

[0075] The size of the metasurface structures 121, 122, 123 may depend on the wavelength of the incident electromagnetic wave. For example, in this embodiment, for a millimeter wave electromagnetic wave, the size of the metasurface structures 121, 122, 123 may be between 0.01×0.01 mm 2 Up to 10×10mm 2 In addition, the material of the super surface structures 121, 122, and 123 may include metals (such as aluminum, copper, chromium, silver, titanium, molybdenum, etc.), conductive oxides (such as indium tin oxide, zinc aluminum oxide, zinc gallium oxide, zinc indium oxide, etc.), conductive polymers (such as poly (3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT:PSS)), metal nanowires (such as silver nanowires) or a combination thereof.

[0076] Please refer to Figure 1C Since the metasurface structures 121, 122, 123 of different sizes have different electromagnetic wave resonance frequencies, the electromagnetic waves will obtain different phase delays after being acted upon by the metasurface structures 121, 122, 123 of different sizes. In this way, the phase delay of the electromagnetic waves can be controlled by the size of the metasurface structures 121, 122, 123, and the emission angle of the electromagnetic waves can be controlled by the size change of the metasurface structures 121, 122, 123, thereby achieving the effect of beam steering.

[0077] In order to provide the function of displaying a picture, the display elements 131 and 132 arranged in an array may be disposed on the substrate 110 of the display device 10, wherein the display element 131 is located in the opening OP of the metasurface structure group 120, and the display element 132 is located between the metasurface structures 121, 122, and 123. In other words, the position of the opening OP of the metasurface structure group 120 may be adjusted depending on the position of the display element 131 determined by the arrangement of the display elements 131 and 132.

[0078] In this embodiment, the display elements 131 and 132 are preferably micro-light emitting diodes (Micro-LEDs), but are not limited thereto. The size of the display elements 131 and 132 can be between 1×1 μm 2 Up to 50×50μm 2 In some embodiments, the size of the display elements 131 and 132 may be determined according to the wavelength of the incident electromagnetic wave.

[0079] In this embodiment, multiple display elements 131 may be respectively embedded in the supersurface structures 121, 122, and 123 of the supersurface structure group 120, but the present invention is not limited thereto. In some embodiments, the supersurface structure group 120 may also include a supersurface structure that embeds only one display element 131 or does not embed any display element 131, depending on the size relationship between the supersurface structure in the supersurface structure group 120 and the display element 131.

[0080] Please refer to Figure 1B In this embodiment, the display device 10 further includes a driving element DC, which is electrically connected to the display elements 131 and 132 and is used to drive the display elements 131 and 132 to display images. The driving element DC may be located on the back side 102 of the substrate 110 and electrically connected to the display elements 131 and 132 through a wire CW disposed in the substrate 110, but is not limited thereto. In some embodiments, the driving element DC may be located on the front side 101 of the substrate 110 like the display elements 131 and 132 and electrically connected to the display elements 131 and 132 through a wire disposed on the front side 101.

[0081] In order to prevent the metasurface structures 121, 122, 123 from reflecting visible light and affecting the image quality displayed by the display device 10, a visible light absorption layer 140 is used to cover the metasurface structures 121, 122, 123. In addition, the visible light absorption layer 140 does not cover the display elements 131, 132. Therefore, the visible light absorption layer 140 can have a plurality of openings OR, and the display elements 131, 132 can be respectively disposed in the openings OR, and the positions of the openings OR can be adjusted according to the positions of the display elements 131, 132. In the openings OP of the metasurface structure group 120, the visible light absorption layer 140 can be filled between the metasurface structures 121, 122, 123 and the display element 131. There is no special limitation on the material of the visible light absorption layer 140, as long as it has a high absorptivity and / or a low transmittance for visible light with a wavelength of 380nm to 780nm. For example, the visible light with a wavelength of 380 nm to 780 nm may have a transmittance of less than 10% for the visible light absorbing layer 140. In addition, for millimeter waves with a wavelength of 1 mm to 10 mm, the visible light absorbing layer 140 may also have a low absorptivity and / or a high transmittance. For example, the transmittance of millimeter waves with a wavelength of 1 mm to 10 mm for the visible light absorbing layer 140 may be greater than 50%. In some embodiments, the visible light absorbing layer 140 may include a polyimide-based photoresist material or an acrylic-based photoresist material.

[0082] The following, with Figure 2 10 continues to illustrate other embodiments or implementations of the present invention, wherein the Figures 1A to 1CThe same or similar component numbers are used to represent the same or similar components, and the description of the same technical content is omitted. For the description of the omitted parts, please refer to Figures 1A to 1C The embodiments of the present invention will not be described in detail in the following description.

[0083] Figure 2 1 is a cross-sectional schematic diagram of a display device 20 according to an embodiment of the present invention. The display device 20 includes: a substrate 110, a plurality of supersurface structure groups 120, and a plurality of display elements 130. The supersurface structure groups 120 and the display elements 130 are located on the substrate 110, and each supersurface structure group 120 may include supersurface structures 121 and 122. The supersurface structure 121 may include a square ring structure 121a and a square structure 121b, and the supersurface structure 122 may include a square ring structure 122a and a square structure 122b. In addition, the supersurface structure group 120 may also include Figure 1A The metasurface structure 123 is shown.

[0084] and Figure 1A to Figure 1B Compared with the display device 10 shown in FIG. Figure 2 The difference of the display device 20 shown is that the display element 130 is not coplanar with the metasurface structure group 120. For example, in this embodiment, the display element 130 is located between the substrate 110 and the metasurface structure group 120. The display device 20 may further include a visible light absorbing layer 140, which may cover the metasurface structures 121 and 122 to prevent the metasurface structures 121 and 122 from reflecting visible light and affecting the image quality of the display device 20.

[0085] In some embodiments, the display device 20 may further include a flat layer 250 , which may cover the display element 130 and be located between the display element 130 and the metasurface structure group 120 to provide a flat surface above the display element 130 to facilitate the setting of the metasurface structure group 120 .

[0086] It is worth noting that in the present embodiment, the display element 130 preferably does not at least partially overlap the visible light absorption layer 140, that is, the orthographic projection of the visible light absorption layer 140 on the substrate 110 at least partially does not overlap the orthographic projection of the display element 130 on the substrate 110, or the orthographic projection of the opening OR of the visible light absorption layer 140 on the substrate 110 may at least partially overlap the orthographic projection of the display element 130 on the substrate 110, so as to prevent the visible light absorption layer 140 from shielding the light emitted by the display element 130 and affecting the picture quality of the display device 20. At the same time, by setting the metasurface structure group 120 to control the phase delay of the electromagnetic wave, the beam steering of the electromagnetic wave can be realized, so that the display device 20 helps to extend the transmission distance of the electromagnetic wave.

[0087] Figure 3 1 is a cross-sectional schematic diagram of a display device 30 according to an embodiment of the present invention. The display device 30 includes: a substrate 110, a metasurface structure group 120, a display element 130, and a visible light absorption layer 140. The metasurface structure group 120 and the display element 130 are located on the substrate 110 and are not coplanar. The metasurface structure group 120 may include metasurface structures 121 and 122. The metasurface structure 121 may include a square ring structure 121a and a square structure 121b, and the metasurface structure 122 may include a square ring structure 122a and a square structure 122b. In addition, the metasurface structure group 120 may also include Figure 1A The metasurface structure 123 is shown. The visible light absorbing layer 140 may cover the metasurface structures 121 , 122 and the substrate 110 .

[0088] and Figure 2 Compared with the display device 20 shown in FIG. Figure 3 The difference of the display device 30 shown is that the metasurface structure group 120 is located between the substrate 110 and the display element 130, and the visible light absorption layer 140 is located between the display element 130 and the metasurface structure group 120, and the visible light absorption layer 140 can cover the metasurface structure group 120 in its entirety without any openings. In addition, the driving element DC can be electrically connected to the display element 130 through the wire CW' disposed in the substrate 110 and the visible light absorption layer 140. The visible light absorption layer 140 covers the metasurface structures 121 and 122 to prevent the metasurface structures 121 and 122 from reflecting visible light and affecting the picture quality of the display device 30. At the same time, by setting the metasurface structure group 120 to control the phase delay of the electromagnetic wave, the beam steering of the electromagnetic wave can be achieved, so that the display device 30 helps to extend the transmission distance of the electromagnetic wave.

[0089] Figure 4 1 is a cross-sectional view of a display device 40 according to an embodiment of the present invention. The display device 40 includes: a substrate 110, a metasurface structure group 120 and a display element 130. Figure 2 Compared with the display device 20 shown in FIG. Figure 4The difference of the display device 40 shown is that the substrate 110 is located between the metasurface structure group 120 and the display element 130, and the substrate 110 can absorb or reflect visible light. That is, the metasurface structure group 120 and the display element 130 are located on the surface of the opposite side of the substrate 110, for example, the display element 130 is located on the front side 101 of the substrate 110, and the metasurface structure group 120 is located on the back side 102 of the substrate 110. In this way, the visible light reflected by the metasurface structure group 120 will not affect the picture quality displayed on the front side 101 of the display device 40, so the surface of the metasurface structure group 120 does not need to be covered with a visible light absorption layer. At the same time, by setting the metasurface structure group 120 to control the phase delay of the electromagnetic wave, the beam steering of the electromagnetic wave can be achieved, so that the display device 40 helps to extend the transmission distance of the electromagnetic wave.

[0090] Figure 5A FIG. 5 is a schematic plan view of a metasurface structure group 520 according to an embodiment of the present invention. Figure 5B yes Figure 5A The phase delay curve of the electromagnetic wave generated by the metasurface structure group 520 is shown in FIG. Figure 1A to Figure 1B Compared with the super surface structure group 120 shown in FIG. Figure 5A The difference of the super surface structure group 520 shown is that the super surface structure group 520 may include super surface structures 521 and 522, and the super surface structures 521 and 522 may have the same shape but different sizes. For example, in the present embodiment, the super surface structure 521 may include a square ring structure 521a and a block structure 521b, and the super surface structure 522 may include a square ring structure 522a and a block structure 522b. The square ring structures 521a and 522a have the same shape, and the size of the square ring structure 521a is larger than the size of the square ring structure 522a. The block structures 521b and 522b have the same shape, and the size of the block structure 521b is larger than the size of the block structure 522b.

[0091] Please refer to Figure 5B Since the metasurface structures 521 and 522 of different sizes have different electromagnetic wave resonance frequencies, the electromagnetic waves will have different phase delays after being acted upon by the metasurface structures 521 and 522 of different sizes. In this way, the phase delay of the electromagnetic waves can be controlled by the size of the metasurface structures 521 and 522, and the emission angle of the electromagnetic waves can be controlled by the size change of the metasurface structures 521 and 522, thereby achieving the effect of beam steering. In addition, Figure 5A The metasurface structure group 520 shown can also be applied to the display devices 10 , 20 , 30 , and 40 of the aforementioned embodiments.

[0092] Fig. 6AFIG. 6 is a schematic plan view of a metasurface structure group 620 according to an embodiment of the present invention. Figure 6B yes Fig. 6A The phase delay curve of the electromagnetic wave generated by the metasurface structure group 620 is shown in FIG. Figure 1A to Figure 1B Compared with the super surface structure group 120 shown in FIG. Fig. 6A The difference of the shown super surface structure group 620 is that the super surface structure group 620 may include super surface structures 621, 622, 623, 624, and the super surface structures 621, 622, 623, 624 may have the same shape but different orientations. For example, in the present embodiment, the super surface structure 621 may include a square ring structure 621a and a block structure 621b, the super surface structure 622 may include a square ring structure 622a and a block structure 622b, the super surface structure 623 may include a square ring structure 623a and a block structure 623b, and the super surface structure 624 may include a square ring structure 624a and a block structure 624b. The square ring structures 621a, 622a, 623a, 624a have the same shape and size but different orientations, and the block structures 621b, 622b, 623b, 624b have the same shape and size but different orientations. For example, the orientation of the metasurface structure 622 may be 45 degrees clockwise rotation of the metasurface structure 621 , the orientation of the metasurface structure 623 may be 90 degrees clockwise rotation of the metasurface structure 621 , and the orientation of the metasurface structure 624 may be 135 degrees clockwise rotation of the metasurface structure 621 .

[0093] Please refer to Figure 6B Since the metasurface structures 621, 622, 623, 624 with different orientations have different electromagnetic wave resonance frequencies, the electromagnetic waves will obtain different phase delays after being acted upon by the metasurface structures 621, 622, 623, 624 with different orientations. In this way, the phase delay of the electromagnetic waves can be controlled by the orientation of the metasurface structures 621, 622, 623, 624, and the emission angle of the electromagnetic waves can be controlled by changing the orientation of the metasurface structures 621, 622, 623, 624, thereby achieving the effect of beam steering. In addition, Fig. 6A The metasurface structure group 620 shown can also be applied to the display devices 10 , 20 , 30 , and 40 of the aforementioned embodiments.

[0094] Fig. 7A FIG. 7 is a plan view of a metasurface structure group 720 according to an embodiment of the present invention. Figure 7B yes Fig. 7A The phase delay curve of the electromagnetic wave generated by the metasurface structure group 720 is shown in FIG. Figure 1A to Figure 1B Compared with the super surface structure group 120 shown in FIG. Fig. 7AThe difference of the shown super surface structure group 720 is that the super surface structure group 720 may include super surface structures 721, 722, 723, 724, 725, and the super surface structures 721, 722, 723, 724, 725 may have the same shape as each other but different sizes from each other. For example, in the present embodiment, the super surface structure 721 may include a square ring structure 721a and a square structure 721b, the super surface structure 722 may include a square ring structure 722a and a square structure 722b, the super surface structure 723 may include a square ring structure 723a and a square structure 723b, the super surface structure 724 may include a square ring structure 724a and a square structure 724b, and the super surface structure 725 may include a square ring structure 725a and a square structure 725b. The square ring structures 721a, 722a, 723a, 724a, and 725a have the same shape, and the sizes of the square ring structures 721a, 722a, 723a, 724a, and 725a are in a decreasing relationship. The block structures 721b, 722b, 723b, 724b, and 725b have the same shape, and the sizes of the block structures 721b, 722b, 723b, 724b, and 725b are also in a decreasing relationship.

[0095] Please refer to Figure 7B Since the metasurface structures 721, 722, 723, 724, 725 of different sizes have different electromagnetic wave resonance frequencies, the electromagnetic waves will obtain different phase delays after being acted upon by the metasurface structures 721, 722, 723, 724, 725 of different sizes. In this way, the phase delay of the electromagnetic waves can be controlled by the size of the metasurface structures 721, 722, 723, 724, 725, and the emission angle of the electromagnetic waves can be controlled by changing the size of the metasurface structures 721, 722, 723, 724, 725, thereby achieving the effect of beam steering. In addition, Fig. 7A The metasurface structure group 720 shown can also be applied to the display devices 10, 20, 30, 40 of the aforementioned embodiments.

[0096] Figure 8 1 is a schematic plan view of a display device 80 according to an embodiment of the present invention. The display device 80 comprises: a substrate 110, display elements 130 arranged in an array, and a plurality of super-surface structure groups 821, 822, 823, 824. Figure 1A to Figure 1B Compared with the display device 10 shown in FIG. Figure 8The difference of the display device 80 shown is that the display device 80 includes different metasurface structure groups 821, 822, 823, and 824. For example, although the metasurface structure groups 821, 822, 823, and 824 all include metasurface structures of the same shape, that is, a combination of a square ring structure and a square structure; however, the number and size changes of the metasurface structures of the metasurface structure group 821 and the metasurface structure group 822 are different; the orientation changes and size changes of the metasurface structures of the metasurface structure group 822 and the metasurface structure group 823 are different; and the arrangement orientations of the metasurface structure group 821 and the metasurface structure group 824 are different. By having a plurality of different types of metasurface structure groups on the same substrate at the same time, beam steering or multi-directional beam scattering can be achieved for electromagnetic waves of multiple wavelengths or multiple incident angles at the same time, so as to achieve the effect of improving the coverage of 5G signals.

[0097] Fig. 9 Schematic diagram of a super surface structure that can be used in an embodiment of the present invention. In the above embodiments, the super surface structure of the super surface structure groups 120, 520, 620, 720, 821, 822, 823, 824 may also have a structure such as Fig. 9 The shapes shown are (a) straight bar, (b) herringbone, (c) herringbone anchor, (d) cross, (e) swastika, (f) cross ring, (g) herringbone ring, (h) circular ring, (i) square ring, (j) hexagonal ring, (k) square, (l) hexagonal block, (m) circular block, (n) sub-shaped, (o) end-folded cross ring, (p) herringbone ring-tripod, etc., or combinations of the above shapes.

[0098] Fig. 10A This is a simulation diagram of a comparative example. Fig. 10B The simulation diagram of an embodiment of the present invention is shown in FIG. The simulation of the comparative example and the embodiment are both performed under the same conditions using 12 GHz electromagnetic waves. The difference between the comparative example and the embodiment is that the simulation of the embodiment uses Figure 3 The display device 30 shown in the figure is carried out, and the simulation of the comparative example is from Figure 3 The display device 30 shown in the figure is removed from the super-surface structure group 120 and the visible light absorption layer 140. Fig. 10A The simulation results show that vertically incident electromagnetic waves will directly penetrate the display device and cannot provide beam steering function. Fig. 10B The simulation results show that most of the vertically incident electromagnetic waves can be reflected and turned to about 30 to 40 degrees.

[0099] In summary, the display device of the present invention is provided with a metasurface structure group that can redirect electromagnetic waves, so that the display device can arbitrarily change the reflection or refraction angle of electromagnetic waves to extend the transmission distance of electromagnetic waves. In this way, display devices installed in various places (such as indoor TVs or outdoor TV walls) can also help improve the signal strength in signal blind spots, thereby improving the coverage of 5G millimeter waves.

[0100] Although the present invention has been disclosed in conjunction with the above embodiments, it is not intended to limit the present invention. Any ordinary technician in the field may make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the definition of the attached claims.

Claims

1. A display device, comprising: substrate; A plurality of supersurface structure groups are located on the substrate and have a plurality of openings, wherein each of the supersurface structure groups includes a plurality of supersurface structures, and the arrangement of the supersurface structures can control the phase delay of the electromagnetic wave and realize the wave velocity steering of the electromagnetic wave; A plurality of first display elements are respectively located in the openings; as well as A visible light absorbing layer covering the metasurface structure, Wherein, the plurality of super-surface structure groups are located between the substrate and the visible light absorption layer.

2. The display device as claimed in claim 1, wherein the visible light absorption layer is filled between the metasurface structure and the first display element.

3. The display device as described in claim 1 further includes a plurality of second display elements located between the metasurface structures. 4 . The display device as claimed in claim 3 , wherein the first display elements and the second display elements are arranged in an array.

5. The display device as claimed in claim 1, wherein the metasurface structure groups are arranged in an array.

6. The display device as claimed in claim 1, wherein each of the metasurface structure groups is the same as or different from each other. 7 . The display device as claimed in claim 1 , wherein the super-surface structures in each of the super-surface structure groups have the same shape and different sizes. 8 . The display device as claimed in claim 1 , wherein each of the supersurface structures in each of the supersurface structure groups has the same shape and different orientations. 9 . The display device as claimed in claim 1 , wherein a material of the super surface structure comprises metal, conductive oxide, conductive polymer, metal nanowire or a combination thereof.

10. A display device, comprising: substrate; A plurality of supersurface structure groups are located on the substrate, and each of the supersurface structure groups includes a plurality of supersurface structures, and the arrangement of the supersurface structures can control the phase delay of the electromagnetic wave and realize the wave velocity steering of the electromagnetic wave; A plurality of display elements are disposed on the substrate, wherein the display elements are not coplanar with the metasurface structure group; as well as A visible light absorbing layer covering the metasurface structure, Wherein, the plurality of super-surface structure groups are located between the substrate and the visible light absorption layer.

11. The display device as claimed in claim 10, wherein the display element is located between the substrate and the metasurface structure group. 12 . The display device as claimed in claim 11 , further comprising a flat layer covering the display element and located between the metasurface structure group and the display element. 13 . The display device of claim 12 , wherein the display element at least partially does not overlap the visible light absorbing layer.

14. The display device as claimed in claim 10, wherein the metasurface structure group is located between the substrate and the display element. 15 . The display device according to claim 14 , further comprising a visible light absorption layer covering the metasurface structure, wherein the visible light absorption layer is located between the display element and the metasurface structure group.

16. The display device as claimed in claim 10, wherein the substrate is located between the metasurface structure group and the display element.

17. The display device as claimed in claim 10, wherein each of the metasurface structure groups is the same as or different from each other. 18 . The display device as claimed in claim 10 , wherein the metasurface structures in each of the metasurface structure groups have the same shape and different sizes.

19. The display device as claimed in claim 10, wherein each of the super-surface structures in each of the super-surface structure groups has a same shape and a different orientation.

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