Display device

Abstract

A display device includes: a first substrate, multiple metasurface structure groups, an optical layer, and a display module. The multiple metasurface structure groups are located on the first substrate. The optical layer is located on the metasurface structure groups. The display module is located on the metasurface structure groups and includes: a second substrate and multiple display units. The second substrate has multiple openings. The multiple display units are located on the second substrate, and the orthographic projections of the display units on the second substrate are outside the openings.

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 fifth-generation mobile communication technology (5G), applications such as telemedicine, VR live streaming, 4K live streaming, and smart homes have all seen new development opportunities. 5G's high data rates, reduced latency, energy savings, lower costs, increased system capacity, and ability to connect large numbers of devices are enabling cross-industry alliances among industry players to jointly build a next-generation 5G ecosystem.

[0003] To improve 5G millimeter-wave coverage, a metasurface structure can be incorporated into a display device to extend the transmission distance of electromagnetic waves. However, because both the metasurface structure and the display unit in the display device have periodic structures, directly integrating the metasurface structure and the display unit into the display device will produce the so-called moiré effect. Furthermore, the metasurface structure's reflection of visible light can degrade the display quality of the display device. Summary of the Invention

[0004] The present invention provides a display device capable of improving the coverage of 5G millimeter waves while maintaining good display quality.

[0005] One embodiment of the present invention provides a display device, comprising: a first substrate; a plurality of metasurface structure groups located on the first substrate; an optical layer located on the metasurface structure group; and a display module located on the metasurface structure group, wherein the display module comprises: a second substrate having a plurality of first openings; and a plurality of display units located on the second substrate, and the orthographic projections of the display units on the second substrate are outside the first openings.

[0006] In one embodiment of the present invention, the optical layer is located between the metasurface structure group and the display module.

[0007] In one embodiment of the present invention, the first substrate is located between the metasurface structure group and the optical layer.

[0008] In one embodiment of the present invention, the aforementioned metasurface structure group is located between the optical layer and the first substrate.

[0009] In one embodiment of the present invention, the aforementioned metasurface structure group includes a plurality of metasurface structures, and the optical layer is further located between the metasurface structures.

[0010] In one embodiment of the present invention, the optical layer includes a millimeter wave transparent substrate.

[0011] In one embodiment of the present invention, the millimeter wave transparent substrate has a plurality of parallel grooves, each groove has a sidewall, and a portion of the sidewall is coated with a visible light absorbing material.

[0012] In one embodiment of the present invention, an angle between the sidewall and a surface parallel to the first substrate is between 0 and 60 degrees.

[0013] In one embodiment of the present invention, the optical layer further includes a retroreflector located in the millimeter wave transparent substrate.

[0014] In one embodiment of the present invention, the display module is located between the metasurface structure group and the optical layer. The optical layer has multiple light-transmitting areas, and the orthographic projections of the multiple light-transmitting areas on the second substrate overlap the orthographic projections of the multiple display units on the second substrate.

[0015] In one embodiment of the present invention, the display module is located between the metasurface structure group and the optical layer. The optical layer has a plurality of second openings, and the orthographic projections of the plurality of second openings on the second substrate overlap the orthographic projections of the plurality of display units on the second substrate.

[0016] In one embodiment of the present invention, the optical layer is located between the display units.

[0017] In one embodiment of the present invention, the optical layer is located in the first opening.

[0018] In one embodiment of the present invention, the orthographic projection of the metasurface structure assembly on the second substrate overlaps the first opening.

[0019] In one embodiment of the present invention, the transmittance of visible light with a wavelength of 380 nm to 780 nm through the optical layer is ≤10%.

[0020] In one embodiment of the present invention, the transmittance of millimeter waves with a wavelength of 1 mm to 10 mm through the optical layer is ≥50%.

[0021] In one embodiment of the present invention, the width or length of the first opening is between 100 μm and 100 mm.

[0022] In one embodiment of the present invention, the plurality of metasurface structure groups are the same as or different from each other.

[0023] In one embodiment of the present invention, each of the aforementioned metasurface structure groups includes a plurality of metasurface structures, and the plurality of metasurface structures in each metasurface structure group have the same shape but different sizes, spacings or orientations.

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

[0025] Figure 1A is a partial cross-sectional schematic diagram of a display device 10 according to an embodiment of the present invention.

[0026] Figure 1B yes Figure 1A A partial plan view of the substrate 110 and the metasurface structure group 120 of the display device 10 is shown.

[0027] Figure 1C yes Figure 1A FIG. 1 is a partial plan view of a display module 140 of a display device 10 .

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

[0029] Figure 3A FIG. 1 is a partial cross-sectional diagram of a display device 30 according to an embodiment of the present invention.

[0030] Figure 3B yes Figure 3A FIG. 1 is a partial plan view of an optical layer 130C of a display device 30 .

[0031] Figure 3C yes Figure 3A An enlarged schematic diagram of region I.

[0032] Figure 4 FIG. 4 is a partial cross-sectional diagram of a display device 40 according to an embodiment of the present invention.

[0033] Figure 5 FIG. 5 is a partial cross-sectional diagram of a display device 50 according to an embodiment of the present invention.

[0034] Figure 6A FIG. 1 is a partial cross-sectional diagram of a display device 60 according to an embodiment of the present invention.

[0035] Figure 6B yes Figure 6A FIG. 1 is a partial plan view of an optical layer 130F of a display device 60 .

[0036] Figure 7 FIG. 1 is a partial cross-sectional diagram of a display device 70 according to an embodiment of the present invention.

[0037] Figure 8 FIG. 8 is a partial cross-sectional diagram of a display device 80 according to an embodiment of the present invention.

[0038] Figure 9 FIG. 1 is a partial cross-sectional diagram of a display device 90 according to an embodiment of the present invention.

[0039] Figure 10 1 is a plan view of a substrate 110 , metasurface structure groups 120K, 120L, 120M, 120N, 120O, an optical layer 130 , and a display module 140 of a display device 100 according to an embodiment of the present invention.

[0040] Figure 11 Schematic diagram of a metasurface structure group that can be used in an embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 10, 20, 30, 40, 50, 60, 70, 80, 90, 100: Display device

[0043] 110: Substrate

[0044] 111: Surface

[0045] 120, 120K, 120L, 120M, 120N, 120O: metasurface structure group

[0046] 121, 122, 123: Metasurface structures

[0047] 130, 130B, 130C, 130D: Optical layer

[0048] 130F, 130G, 130H, 130I: Optical layer

[0049] 140: Display module

[0050] BS: bottom surface

[0051] D1: Spacing

[0052] DU: Display Unit

[0053] EL: Extension line

[0054] GV: Groove

[0055] I: Region

[0056] IA, IB, IC, ID1, ID2: incident electromagnetic waves

[0057] MS: Millimeter waves can penetrate substrates

[0058] NA: Visible light absorption area

[0059] O1, O2: Open

[0060] OA1, OA2: reflected electromagnetic waves

[0061] OB1, OB2, OB3: Scattered electromagnetic waves

[0062] OC1, OC2: modulated electromagnetic waves

[0063] OD1, OD2, OD3: Focused electromagnetic waves

[0064] PL: Phase Shift Line

[0065] RR: Retroreflector

[0066] SB: Substrate

[0067] TA: Translucent Area

[0068] VA: Visible light absorbing material

[0069] W1, W2: side walls

[0070] θ: angle DETAILED DESCRIPTION

[0071] Figure 1A is a partial cross-sectional schematic diagram of a display device 10 according to an embodiment of the present invention. Figure 1B yes Figure 1A A partial plan view of the substrate 110 and the metasurface structure group 120 of the display device 10 is shown. Figure 1C yes Figure 1A FIG. 1 is a partial plan view of a display module 140 of a display device 10 .

[0072] Please also refer to Figures 1A to 1C The display device 10 includes: a substrate 110; a plurality of metasurface structure groups 120, located on the substrate 110; an optical layer 130, located on the metasurface structure group 120; and a display module 140, located on the metasurface structure group 120, wherein the display module 140 includes: a substrate SB having a plurality of openings O1; and a plurality of display units DU, located on the substrate SB, and the orthographic projections of the display units DU on the substrate SB are outside the openings O1.

[0073] As described above, in a display device 10 according to one embodiment of the present invention, the metasurface structure group 120 is provided to control the phase delay of electromagnetic waves, thereby achieving beam steering of the electromagnetic waves. This allows the display device 10 to extend the transmission distance of electromagnetic waves, thereby improving the coverage of 5G millimeter waves. Furthermore, by providing an optical layer 130 to absorb visible light, the moiré effect can be prevented, while also preventing the metasurface structure group 120 from reflecting visible light and affecting display quality. Furthermore, by providing multiple openings O1 in the substrate SB, millimeter wave transmittance can be improved.

[0074] Hereinafter, the implementation of each component of the display device 10 will be described in conjunction with the accompanying drawings. Figure 1A and Figure 1BThe substrate 110 of the display device 10 can be used to support the metasurface structure group 120 and the display module 140. The material of the substrate 110 can be flexible or inflexible, such as glass, ceramic, quartz, metal, polyimide (PI), polycarbonate (PC), composite materials, or other suitable materials, but the present invention is not limited thereto.

[0075] The metasurface structure group 120 may include multiple metasurface structures that constitute a minimum repeating unit. For example, in this embodiment, the metasurface structures 121, 122, and 123 constitute a minimum repeating unit. Therefore, the metasurface structure group 120 may include metasurface structures 121, 122, and 123. Since the metasurface structures 121, 122, and 123 of different sizes have different resonant frequencies, when electromagnetic waves of a specific frequency are incident on these metasurface structures 121, 122, and 123, these metasurface structures 121, 122, and 123 will generate induced currents with different phase delays, thereby changing the phase of the reflected electromagnetic waves. In this way, by controlling the size of the metasurface structures 121, 122, and 123, the phase delay of the induced current can be controlled, and the emission angle of the electromagnetic wave can be adjusted to steer the electromagnetic wave, thereby achieving the technical effect of beam steering.

[0076] The multiple sets of metasurface structure groups 120 disposed on the substrate 110 can be the same as or different from each other. For example, in this embodiment, the display device 10 can include multiple sets of metasurface structure groups 120 that are the same as or similar to each other, that is, the metasurface structure groups 120 can have the same or similar shapes, sizes, orientations, etc., but the present invention is not limited to this. However, in some embodiments, the display device 10 can include multiple sets of metasurface structure groups that are different in shape, size and / or orientation.

[0077] The metasurface structure group 120 can be arranged on the substrate 110 in an array. Figure 1B In the illustrated embodiment, the six metasurface structure groups 120 may be arranged on the substrate 110 in a 2x3 matrix, but the present invention is not limited thereto. In some embodiments, the six metasurface structure groups 120 may also be arranged on the substrate 110 in a 1x6, 3x2, or 6x1 matrix.

[0078] The super-surface structures 121, 122, and 123 in the super-surface structure group 120 may have the same shape but different sizes. For example, in this embodiment, the super-surface structures 121, 122, and 123 of the super-surface structure group 120 may all be cross structures, and the size of the super-surface structure 121 is larger than the size of the super-surface structure 122, and the size of the super-surface structure 122 is larger than the size of the super-surface structure 123. In other words, the super-surface structures 121, 122, and 123 have the same shape but different sizes, and the sizes of the super-surface structures 121, 122, and 123 are 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 1B As shown in the cross structure, the size changes of the metasurface structures 121, 122, and 123 can also be individually changed or combined in terms of their three-dimensional sizes, and the shapes, sizes, and orientations of the metasurface structures 121, 122, and 123 in the individual metasurface structure groups 120 can also be individually fine-tuned to achieve the required beam steering.

[0079] 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 millimeter-wave electromagnetic waves, the size of the metasurface structures 121, 122, 123 may be between 0.01 x 0.01 mm. 2 Up to 10x10mm 2 In addition, the materials of the metasurface structures 121, 122, and 123 may include metals (e.g., aluminum, copper, chromium, silver, titanium, molybdenum, etc.), conductive oxides (e.g., indium tin oxide, zinc aluminum oxide, zinc gallium oxide, zinc indium oxide, etc.), conductive polymers (e.g., poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)), metal nanowires (e.g., silver nanowires), or combinations thereof.

[0080] Please also refer to Figure 1A and Figure 1CIn order to provide the function of displaying a picture, the display module 140 of the display device 10 may be provided with display units DU arranged in an array on the substrate SB. In this embodiment, the substrate SB may be a flexible substrate or a circuit substrate, such as a printed circuit board (PCB). In order to improve the penetration rate of millimeter waves and facilitate the metasurface structure group 120 to control the direction of the reflected electromagnetic waves, a plurality of openings O1 are provided in the substrate SB, wherein the orthographic projection of the metasurface structure group 120 on the substrate SB may overlap the openings O1, and no display units DU are provided on the openings O1 to prevent the display units DU from obscuring the openings O1. In addition, there is no particular limitation on the shape, number, and size of the openings O1. For example, the width or length of the openings O1 may be between 100 μm and 100 mm. For example, the minimum width of the openings O1 may be 100 μm, 200 μm, or 500 μm, and the maximum length of the openings O1 may be 1 mm, 10 mm, or 100 mm, but are not limited thereto.

[0081] In this embodiment, the display unit DU may include an organic light emitting diode (OLED), a micro-light emitting diode (Micro-LED), or an electrophoretic display unit, etc., and the present invention is not limited thereto. The size of the display unit DU may depend on the wavelength of the incident electromagnetic wave. In some embodiments, the size of the display unit DU may be, for example, between 1x1 μm and 1x1 μm. 2 Up to 50x50μm 2 between.

[0082] Please refer to Figure 1A To prevent the metasurface structures 121, 122, and 123 of the metasurface structure group 120 from reflecting visible light and affecting the image quality displayed by the display device 10, an optical layer 130 is used to cover the surface structure group 120. In this embodiment, the optical layer 130 is located below the display module 140, and between the metasurface structure group 120 and the display module 140, and between the metasurface structure group 120 and the substrate 110, but the present invention is not limited to this. In some embodiments, the optical layer 130 can also be located above the display module 140 without affecting the light output of the display unit DU.

[0083] The material of the optical layer 130 is not particularly limited, as long as it has high absorptivity and / or low transmittance for visible light with a wavelength between 380 nm and 780 nm. For example, the transmittance of visible light with a wavelength between 380 nm and 780 nm through the optical layer 130 may be less than or equal to 10%. Furthermore, the optical layer 130 may also have low absorptivity and / or high transmittance for millimeter waves with a wavelength between 1 mm and 10 mm. For example, the transmittance of millimeter waves with a wavelength between 1 mm and 10 mm through the optical layer 130 may be greater than or equal to 50%. In some embodiments, the optical layer 130 may include a polyimide photoresist material or an acrylic photoresist material.

[0084] The following, with Figures 2 to 11 Continuing to describe other embodiments or implementations of the present invention, wherein the Figures 1A to 1C The 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 will not be described in detail in the following description.

[0085] Figure 2 FIG is a partial cross-sectional view of a display device 20 according to an embodiment of the present invention. The display device 20 includes: a substrate 110, a plurality of metasurface structure groups 120, an optical layer 130B, and a display module 140. Figures 1A to 1C Compared with the display device 10 shown in FIG. Figure 2 The difference of the display device 20 shown is that the optical layer 130B can also be located between the metasurface structures 121, 122, and 123 of the metasurface structure group 120. In this way, the structural stability of the display device 20 can be improved.

[0086] Figure 3A FIG. 1 is a partial cross-sectional diagram of a display device 30 according to an embodiment of the present invention. Figure 3B yes Figure 3A FIG. 1 is a partial plan view of an optical layer 130C of a display device 30 . Figure 3C yes Figure 3A Please also refer to the enlarged schematic diagram of area I. Figures 3A to 3C The display device 30 includes: a substrate 110, a plurality of metasurface structure groups 120, an optical layer 130C and a display module 140. Figures 1A to 1C Compared with the display device 10 shown in FIG. 3 , the display device 30 shown in FIG. 3 is different in that the optical layer 130C includes a millimeter-wave-transmissive substrate MS, and the millimeter-wave-transmissive substrate MS has a plurality of parallel grooves GV, wherein each groove GV has two opposite side walls W1 and W2, and the surface of the side wall W1 is coated with a visible light absorbing material VA.

[0087] In this embodiment, the groove GV may further include a bottom surface BS connecting the sidewalls W1 and W2. The bottom surface BS may be parallel to the surface 111 of the substrate 110, and the angle θ between the sidewalls W1 and the extension line EL of the bottom surface BS may be between 0 and 60 degrees. When the display device 30 is standing or hung on a wall, the sidewalls W1 of each groove GV may be located below the sidewalls W2, such that the surface of the sidewalls W1 faces upward. Furthermore, the orthographic projection of the opening O1 of the substrate SB of the display module 140 onto the optical layer 130C may fall onto the sidewalls W1. In other words, the orthographic projection of the opening O1 of the substrate SB onto the optical layer 130C may be located within the region coated with the visible light absorbing material VA. In this manner, the visible light incident on the optical layer 130C is largely absorbed by the visible light absorbing material VA on the sidewalls W1.

[0088] Figure 4 FIG is a partial 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 plurality of metasurface structure groups 120, an optical layer 130D, and a display module 140. Figures 1A to 1C Compared with the display device 10 shown in FIG. Figure 4 The difference of the display device 40 shown is that the optical layer 130D includes a millimeter-wave transparent substrate MS and a retroreflector RR, and the retroreflector RR is located in the millimeter-wave transparent substrate MS.

[0089] In this embodiment, the retro-reflectors RR may be spaced apart by a distance D1, and the orthographic projection of the opening O1 of the substrate SB of the display module 140 on the optical layer 130D may completely overlap the retro-reflectors RR. Thus, visible light incident on the retro-reflectors RR of the optical layer 130D may be reflected back toward its original direction by the retro-reflectors RR and may not be incident on the metasurface structure assembly 120. Meanwhile, millimeter-wave signals may pass through the millimeter-wave-transmissive substrate MS between the retro-reflectors RR and be incident on the metasurface structure assembly 120.

[0090] Figure 5 FIG is a partial cross-sectional view of a display device 50 according to an embodiment of the present invention. The display device 50 includes: a substrate 110, a plurality of metasurface structure groups 120, an optical layer 130, and a display module 140. Figures 1A to 1C Compared with the display device 10 shown in FIG. Figure 5 The difference of the display device 50 shown is that the substrate 110 is located between the metasurface structure group 120 and the optical layer 130 .

[0091] In this embodiment, the metasurface structure group 120 and the display module 140 are located on opposite surfaces of the optical layer 130. This prevents visible light reflected by the metasurface structure group 120 from penetrating the optical layer 130 and, therefore, from affecting the display quality of the display module 140. Furthermore, the metasurface structure group 120 can control the phase delay of incident electromagnetic waves to achieve beam steering, thereby extending the transmission distance of electromagnetic waves in the display device 50.

[0092] Figure 6A FIG. 1 is a partial cross-sectional diagram of a display device 60 according to an embodiment of the present invention. Figure 6B yes Figure 6A Please also refer to the partial plan view of the optical layer 130F of the display device 60. Figure 6A and Figure 6B The display device 60 includes: a substrate 110, a plurality of metasurface structure groups 120, an optical layer 130F and a display module 140. Figures 1A to 1C Compared with the display device 10 shown in FIG. 6 , the display device 60 shown in FIG. 6 is different in that the display module 140 is located between the metasurface structure group 120 and the optical layer 130F, and the optical layer 130F has a plurality of light-transmitting areas TA and visible light-absorbing areas NA.

[0093] In this embodiment, the orthographic projections of the plurality of light-transmitting areas TA on the substrate SB of the display module 140 can overlap the orthographic projections of the plurality of display units DU of the display module 140 on the substrate SB. In this way, the light-transmitting areas TA do not affect the light output of the display units DU, and the visible light absorbing areas NA can prevent visible light from being incident on the underlying metasurface structure group 120.

[0094] Figure 7 FIG is a partial cross-sectional view of a display device 70 according to an embodiment of the present invention. The display device 70 includes: a substrate 110, a plurality of metasurface structure groups 120, an optical layer 130G, and a display module 140. Figures 1A to 1C Compared with the display device 10 shown in FIG. Figure 7 The difference of the display device 70 shown is that the display module 140 is located between the meta-surface structure group 120 and the optical layer 130G, and the optical layer 130G has a plurality of openings O2.

[0095] In this embodiment, the optical layer 130G is capable of absorbing visible light, thereby preventing the metasurface structure group 120 below the optical layer 130G from reflecting visible light and affecting the display quality of the display device 70. In addition, the orthographic projections of the plurality of openings O2 on the substrate SB of the display module 140 can overlap the orthographic projections of the plurality of display units DU of the display module 140 on the substrate SB, respectively, so that the display units DU can emit light normally.

[0096] Figure 8 FIG is a partial cross-sectional view of a display device 80 according to an embodiment of the present invention. The display device 80 includes: a substrate 110, a plurality of metasurface structure groups 120, an optical layer 130H, and a display module 140. Figure 7 Compared to the display device 70 shown in FIG. Figure 8 The difference of the display device 80 shown is that the optical layer 130H is located between the display units DU of the display module 140. In this embodiment, the optical layer 130H can fill the space between the display units DU and can absorb visible light reflected by the underlying metasurface structure group 120, thereby preventing the visible light reflected by the underlying metasurface structure group 120 from affecting the display quality of the display device 80.

[0097] Figure 9 FIG is a partial cross-sectional view of a display device 90 according to an embodiment of the present invention. The display device 90 includes: a substrate 110, a plurality of metasurface structure groups 120, an optical layer 130I, and a display module 140. Figure 8 Compared to the display device 80 shown in FIG. Figure 9 The difference of the display device 90 shown is that the optical layer 130I is located in the opening O1 of the substrate SB of the display module 140. In this embodiment, the optical layer 130I can fill the opening O1 of the substrate SB and can absorb visible light reflected by the underlying metasurface structure group 120, thereby ensuring that the display device 90 has good display quality.

[0098] Figure 10 1 is a schematic plan view of a substrate 110, a plurality of metasurface structure groups 120K, 120L, 120M, 120N, 120O, an optical layer 130, and a display module 140 of a display device 100 according to an embodiment of the present invention. The display device 100 includes: a substrate 110, a plurality of metasurface structure groups 120K, 120L, 120M, 120N, 120O, an optical layer 130, and a display module 140. Figures 1A to 1C Compared with the display device 10 shown in FIG. Figure 10 The difference of the display device 100 shown is that the display device 100 includes different metasurface structure groups 120K, 120L, 120M, 120N, and 120O, and the metasurface structures of the metasurface structure group 120O can also be further added with phase shift lines PL.

[0099] For example, in this embodiment, the metasurface structures of the metasurface structure groups 120K, 120L, 120M, and 120N have the same cross-shaped structure, but different sizes, spacings, and / or orientations. Specifically, the metasurface structures of the metasurface structure group 120K can have different sizes, thereby causing the incident electromagnetic wave IA to reflect and generate a reflected electromagnetic wave OA1, or causing the incident electromagnetic wave IA to undergo an anomalous reflection and generate an anomalous reflected electromagnetic wave OA2. In addition, the metasurface structures of the metasurface structure group 120L can have different spacings, thereby causing the incident electromagnetic wave IB to scatter and generate scattered electromagnetic waves OB1, OB2, and OB3. In addition, the metasurface structures of the metasurface structure group 120M can have different orientations, thereby causing the incident electromagnetic wave IC to undergo frequency shifting, intensity modulation, or polarization state control, thereby generating modulated electromagnetic waves OC1 and OC2. Furthermore, the metasurface structures of the metasurface structure group 120N can have different sizes and spacings, thereby enabling incident electromagnetic waves ID1 and ID2 to generate focused electromagnetic waves OD1, OD2, and OD3. By simultaneously including a plurality of metasurface structure groups 120K, 120L, 120M, and 120N on the substrate 110, beam steering or multi-directional beam scattering can be achieved for electromagnetic waves of multiple wavelengths or multiple incident angles, thereby achieving the technical effect of improving 5G signal coverage.

[0100] Figure 11 Schematic diagram of a super surface structure that can be used in an embodiment of the present invention. In the above embodiment, the super surface structure of the super surface structure groups 120, 120K, 120L, 120M, and 120N may also have a structure such as Figure 11 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.

[0101] In summary, the display device of the present invention utilizes a metasurface structure to reflect, scatter, frequency-shift, intensity-modulate, polarization-control, or focus electromagnetic waves in the millimeter wave band, thereby improving 5G millimeter wave coverage. Furthermore, by providing multiple openings O1 in the substrate SB, millimeter wave penetration can be improved. Furthermore, by providing an optical layer to prevent visible light reflection from the metasurface structure, the moiré effect can be prevented, while maintaining excellent display quality.

[0102] Although the present invention has been disclosed above with reference to the embodiments, they are not intended to limit the present invention. Any person skilled in the art may make slight changes and modifications without departing from the concept and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A display device, comprising: a first substrate; A plurality of metasurface structure groups are located on the first substrate; an optical layer, located on the metasurface structure group; as well as A display module is located on the metasurface structure group, wherein the display module includes: a second substrate having a plurality of first openings; as well as A plurality of display units are located on the second substrate, and the orthographic projections of the display units on the second substrate are outside the first opening. The metasurface structure group reflects, scatters, frequency-shifts, modulates intensity, controls polarization states, or focuses electromagnetic waves. The optical layer includes a millimeter wave transparent substrate. 2 . The display device as claimed in claim 1 , wherein the optical layer is located between the metasurface structure group and the display module.

3. The display device of claim 2, wherein the first substrate is located between the metasurface structure group and the optical layer. 4 . The display device as claimed in claim 2 , wherein the metasurface structure group is located between the optical layer and the first substrate. 5 . The display device according to claim 4 , wherein the metasurface structure group comprises a plurality of metasurface structures, and the optical layer is further located between the metasurface structures. 6 . The display device as claimed in claim 1 , wherein the millimeter wave transparent substrate has a plurality of parallel grooves, each of the grooves has a sidewall, and a portion of the sidewall is coated with a visible light absorbing material. 7 . The display device according to claim 6 , wherein an angle between the sidewall and a surface parallel to the first substrate is between 0 and 60 degrees. 8 . The display device according to claim 1 , wherein the optical layer further comprises a retroreflector located in the millimeter-wave transparent substrate.

9. The display device as claimed in claim 1, wherein the display module is located between the metasurface structure group and the optical layer, the optical layer has a plurality of light-transmitting areas, and the orthographic projections of the plurality of light-transmitting areas on the second substrate respectively overlap the orthographic projections of the plurality of display units on the second substrate.

10. The display device as claimed in claim 1, wherein the display module is located between the metasurface structure group and the optical layer, the optical layer has a plurality of second openings, and the orthographic projections of the plurality of second openings on the second substrate respectively overlap the orthographic projections of the plurality of display units on the second substrate. The display device of claim 1 , wherein the optical layer is located between the display units. 12 . The display device of claim 1 , wherein the optical layer is located in the first opening. 13 . The display device as claimed in claim 1 , wherein an orthographic projection of the metasurface structure group on the second substrate overlaps the first opening. 14 . The display device according to claim 1 , wherein a transmittance of visible light with a wavelength of 380 nm to 780 nm through the optical layer is ≤10%. 15 . The display device according to claim 1 , wherein a transmittance of millimeter waves with a wavelength of 1 mm to 10 mm through the optical layer is ≥50%. 16 . The display device as claimed in claim 1 , wherein a width or a length of the first opening is between 100 μm and 100 mm.

17. The display device according to claim 1, wherein the multiple groups of metasurface structures are the same as or different from each other. 18 . The display device according to claim 1 , wherein each of the metasurface structure groups comprises a plurality of metasurface structures, and the plurality of metasurface structures in each of the metasurface structure groups have the same shape and different sizes, spacings, or orientations.

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