TWI769863B - Display device - Google Patents

Abstract

A display device includes a substrate, a plurality of meta-surface structure sets, a plurality of display elements and a visible light absorbing layer. The meta-surface structure sets are disposed on the substrate and have a plurality of openings, in which each meta-surface structure set includes a plurality of meta-surface structures. The display elements are disposed in the openings respectively. The visible light absorbing layer covers the meta-surface structures.

Description

display device

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

With the commercialization of the fifth-generation mobile communication technology (5G), applications such as telemedicine, VR live broadcast, 4K quality live broadcast, and smart home have new opportunities for development. Due to the high data rate, reduced delay, energy saving, cost reduction, system capacity improvement and large-scale device connection of 5G, players in different fields can also form alliances across borders to jointly build a new generation of 5G ecological chain. However, at the initial stage of 5G launch, how to improve the coverage of 5G mmWave by reducing the construction cost of 5G equipment is an urgent problem for the industry to solve.

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

An embodiment of the present invention provides a display device, including: a substrate; a plurality of metasurface structure groups located on the substrate and having a plurality of openings, wherein each metasurface structure group includes a plurality of metasurface structures; a plurality of first display elements, respectively located in the openings; and a visible light absorbing layer covering the metasurface structure.

In an embodiment of the present invention, the above-mentioned visible light absorbing layer is filled between the metasurface structure and the first display element.

In an embodiment of the present invention, the above-mentioned display device further includes a plurality of second display elements located between the metasurface structures.

In an embodiment of the present invention, the above-mentioned first display elements and second display elements are arranged in an array.

In an embodiment of the present invention, the above-mentioned metasurface structure groups are arranged in an array.

In an embodiment of the present invention, the above-mentioned groups of metasurface structures are the same or different from each other.

In an embodiment of the present invention, each metasurface structure in each of the above-mentioned metasurface structure groups has the same shape and different size from each other.

In an embodiment of the present invention, each metasurface structure in each of the above-mentioned metasurface structure groups has the same shape and different orientations from each other.

In an embodiment of the present invention, the material of the above-mentioned metasurface structure includes metal, conductive oxide, conductive polymer, metal nanowire or a combination thereof.

An embodiment of the present invention provides a display device, comprising: a substrate; a plurality of metasurface structure groups located on the substrate, and each metasurface structure group includes a plurality of metasurface structures; and a plurality of display elements located on the substrate, wherein The display elements are not coplanar with the set of metasurface structures.

In an embodiment of the present invention, the above-mentioned display element is located between the substrate and the metasurface structure group.

In an embodiment of the present invention, the above-mentioned display device further includes a visible light absorbing layer covering the metasurface structure.

In an embodiment of the present invention, the above-mentioned display device further includes a flat layer covering the display element and located between the metasurface structure group and the display element.

In an embodiment of the present invention, the above-mentioned display element at least partially does not overlap the visible light absorbing layer.

In an embodiment of the present invention, the above-mentioned metasurface structure group is located between the substrate and the display element.

In an embodiment of the present invention, the above-mentioned display device further includes 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.

In an embodiment of the present invention, the above-mentioned substrate is located between the metasurface structure group and the display element.

In an embodiment of the present invention, the above-mentioned groups of metasurface structures are the same or different from each other.

In an embodiment of the present invention, each metasurface structure in each of the above-mentioned metasurface structure groups has the same shape and different size from each other.

In an embodiment of the present invention, each metasurface structure in each of the above-mentioned metasurface structure groups has the same shape and different orientations from each other.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

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

Please refer to FIG. 1A and FIG. 1B at the same time, the display device 10 includes: a substrate 110 , a plurality of metasurface structure groups 120 , a plurality of display elements 131 and a visible light absorbing layer 140 . The metasurface structure group 120 is located on the substrate 110 and has a plurality of openings OP, wherein each metasurface structure group 120 includes metasurface structures 121 , 122 and 123 . The display elements 131 are located in the openings OP, respectively. The visible light absorbing layer 140 covers the metasurface structures 121 , 122 and 123 .

Based on the above, in the display device 10 according to an embodiment of the present invention, by setting the metasurface structure group 120 to control the phase delay of the electromagnetic wave, beam steering of the electromagnetic wave can be realized, so that the display device 10 is helpful for extending The transmission distance of electromagnetic waves can improve the coverage of 5G millimeter waves without adding 5G equipment.

Hereinafter, the embodiments of each element of the display device 10 will be continuously described with reference to the drawings. Referring to FIG. 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 may be flexible or inflexible, such as glass, ceramic, quartz, metal, polyimide (PI), polycarbonate (PC), composite material or other suitable materials, The present invention is not limited to this.

The metasurface structure group 120 may include a plurality of metasurface structures on the substrate 110 that constitute the smallest repeating unit. For example, in the present embodiment, the metasurface structures 121 , 122 , and 123 constitute the smallest repeating unit on the substrate 110 . Therefore, the metasurface structure group 120 may include the metasurface structures 121 , 122 , and 123 .

Since the metasurface structures 121 , 122 , and 123 with different sizes have different resonance frequencies, when electromagnetic waves of a specific frequency are incident on the metasurface structures 121 , 122 , and 123 , the metasurface structures 121 , 122 , and 123 will produce different phase retardations. Induces current, which in turn changes the phase of the reflected electromagnetic wave. 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 turn the electromagnetic wave.

The plurality of metasurface structure groups 120 disposed on the substrate 110 may be the same as each other or different from each other. For example, in this embodiment, the display device 10 may include multiple sets of metasurface structure groups 120 that are identical to each other, that is, the metasurface structure groups 120 may have the same shape, size, orientation, etc. Not limited to this. However, in some embodiments, the display device 10 may include a plurality of sets of metasurface structures that are different from each other.

The metasurface structure groups 120 may be arranged on the substrate 110 substantially in an array manner. For example, in the embodiment shown in FIG. 1A , four sets of metasurface structure groups 120 may be arranged on the substrate 110 in a substantially 2×2 matrix, but not limited thereto. In some embodiments, the four metasurface structure groups 120 may also be arranged on the substrate 110 in a 1×4 or 4×1 matrix.

The metasurface structures 121, 122, 123 in the metasurface structure group 120 may have the same shape as each other, but different sizes from each other. For example, in this embodiment, the metasurface structure 121 of the metasurface structure group 120 may include a square ring structure 121a and a block structure 121b; the metasurface structure 122 may include a square ring structure 122a and a block structure 122b; and the metasurface 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 that of the square ring structure 122a, and the size of the square ring structure 122a is larger than that of the square ring structure 123a. That is to say, the square ring structure 121a, The sizes of 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 also show a decreasing relationship. It should be noted that the shapes of the metasurface structures 121, 122, 123 are not limited to the combination of the square ring structures 121a, 122a, 123a and the square structures 121b, 122b, 123b as shown in FIG. 1A, and the metasurface structures 121, 122 The dimensional changes of , 123 can also be individually or combined with respect to their three-dimensional dimensions.

The dimensions of the metasurface structures 121, 122, 123 may depend on the wavelength of the incident electromagnetic waves. For example, in this embodiment, for millimeter-wave electromagnetic waves, the dimensions of the metasurface structures 121 , 122 , and 123 may be between 0.01×0.01 mm ² to 10×10 mm ² , but not limit. In addition, the materials of the metasurface structures 121 , 122 , and 123 may include metals (eg, aluminum, copper, chromium, silver, titanium, molybdenum, etc.), conductive oxides (eg, indium tin oxide, zinc aluminum oxide, zinc gallium oxide, etc.) , zinc indium oxide, etc.), conductive polymers (such as poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS)), metal nanowires (such as silver nanowires) line) or a combination thereof.

Referring to FIG. 1C , since the metasurface structures 121 , 122 , and 123 with different sizes have different resonance frequencies of electromagnetic waves, the electromagnetic waves will have different phase delays after being acted on by the metasurface structures 121 , 122 , and 123 with different sizes. In this way, the phase delay of the electromagnetic wave can be controlled by the size of the metasurface structures 121, 122, 123, and the emission angle of the electromagnetic wave can be controlled by the size change of the metasurface structures 121, 122, 123, thereby realizing beam steering ( beam steering).

In order to provide a picture display function, the substrate 110 of the display device 10 may be provided with display elements 131 and 132 arranged in an array, wherein the display element 131 is located in the opening OP of the metasurface structure group 120, and the display element 132 is located in the metasurface between structures 121 , 122 and 123 . That is, the position of the opening OP of the metasurface structure group 120 can be adjusted according to the position of the display element 131 determined by the arrangement of the display elements 131 and 132 .

In this embodiment, the display elements 131 and 132 are preferably micro light-emitting diodes (Micro-LEDs), but not limited thereto. The size of the display elements 131 and 132 may be between 1×1 μm ² to 50×50 μm ² , but not limited thereto. In some embodiments, the dimensions of the display elements 131, 132 may depend on the wavelength of the incident electromagnetic waves.

In this embodiment, a plurality of display elements 131 may be respectively embedded in the meta-surface structures 121 , 122 , and 123 of the meta-surface structure group 120 , but not limited thereto. In some embodiments, the metasurface structure group 120 may also include metasurface structures embedded with only one display element 131 or no display element 131 embedded, depending on the metasurface structures in the metasurface structure group 120 and the size of the display elements 131 . relation.

Referring to FIG. 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 for driving the display elements 131 and 132 to display images. The driving element DC may be located on the backside 102 of the substrate 110 , and is electrically connected to the display elements 131 and 132 through the wires CW disposed in the substrate 110 , but not limited thereto. In some embodiments, the driving element DC and the display elements 131 and 132 may be located on the front side 101 of the substrate 110 , and are electrically connected to the display elements 131 and 132 through wires disposed on the front side 101 .

In order to prevent the metasurface structures 121 , 122 , 123 from reflecting visible light and affecting the picture quality displayed by the display device 10 , a visible light absorbing layer 140 is used to cover the metasurface structures 121 , 122 , 123 . In addition, the visible light absorbing layer 140 does not cover the display elements 131 and 132. Therefore, the visible light absorbing layer 140 may have a plurality of openings OR, the display elements 131 and 132 may be respectively disposed in the openings OR, and the positions of the openings OR can be determined according to the display elements. 131 and 132 to adjust the position. In the opening OP of the metasurface structure group 120 , the visible light absorbing layer 140 may be filled between the metasurface structures 121 , 122 , and 123 and the display element 131 . The material of the visible light absorbing layer 140 is not particularly limited, as long as it has high absorptivity and/or low transmittance for visible light with a wavelength of 380 nm to 780 nm. For example, the transmittance of visible light with a wavelength of 380 nm to 780 nm to the visible light absorbing layer 140 may be less than 10%. 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 absorption rate and/or a high transmittance. For example, the transmittance of a millimeter wave with a wavelength of 1 mm to 10 mm to 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.

Hereinafter, other embodiments or implementations of the present invention will be described with reference to FIGS. 2 to 10 , wherein the same or similar element numbers are used to denote the same or similar elements as in the embodiment of FIGS. 1A to 1C , and the same or similar elements are omitted. Description of the same technical content. For the description of the omitted part, reference may be made to the embodiments of FIG. 1A to FIG. 1C , which will not be repeated in the following description.

FIG. 2 is a schematic 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 and a plurality of display elements 130 . The metasurface structure group 120 and the display element 130 are located on the substrate 110 , and each metasurface structure group 120 may include metasurface structures 121 and 122 . The metasurface structure 121 may include a square ring structure 121a and a block structure 121b, and the metasurface structure 122 may include a square ring structure 122a and a block structure 122b. In addition, the metasurface structure group 120 may further include a metasurface structure 123 as shown in FIG. 1A .

Compared with the display device 10 shown in FIGS. 1A to 1B , the display device 20 shown in FIG. 2 is different in that the display element 130 and the metasurface structure group 120 are not coplanar. 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 absorption layer 140 , and the visible light absorption layer 140 may cover 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 20 .

In some embodiments, the display device 20 may further include a flat layer 250 , which may cover the display elements 130 and be located between the display elements 130 and the metasurface structure group 120 to provide a flat surface above the display elements 130 to The setting of the metasurface structure group 120 is facilitated.

It should be noted that, in this embodiment, the display element 130 preferably does not overlap the visible light absorbing layer 140 at least partially, that is, the orthographic projection of the visible light absorbing layer 140 on the substrate 110 at least partially does not overlap the display element 130 on the substrate 110 Alternatively, the orthographic projection of the opening OR of the visible light absorbing 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 absorbing layer 140 from shielding the light emitted by the display element 130 and affecting the display device 20 picture quality. Meanwhile, by setting the metasurface structure group 120 to control the phase delay of the electromagnetic wave, 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.

FIG. 3 is a schematic cross-sectional view 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 absorbing layer 140 . The metasurface structure group 120 and the display element 130 are located on the substrate 110 and are not coplanar. The set of metasurface structures 120 may include metasurface structures 121 , 122 . The metasurface structure 121 may include a square ring structure 121a and a block structure 121b, and the metasurface structure 122 may include a square ring structure 122a and a block structure 122b. In addition, the metasurface structure group 120 may further include a metasurface structure 123 as shown in FIG. 1A . The visible light absorption layer 140 may cover the metasurface structures 121 and 122 and the substrate 110 .

Compared with the display device 20 shown in FIG. 2 , the display device 30 shown in FIG. 3 is different in that: the metasurface structure group 120 is located between the substrate 110 and the display element 130 , and the visible light absorbing layer 140 is located in the display element Between 130 and the metasurface structure group 120, the visible light absorbing layer 140 can cover the metasurface structure group 120 as a whole without any openings. In addition, the driving element DC can be electrically connected to the display element 130 through the wires CW' disposed in the substrate 110 and the visible light absorbing layer 140. The visible light absorbing 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, beam steering of the electromagnetic wave can be realized, so that the display device 30 helps to extend the transmission distance of the electromagnetic wave.

FIG. 4 is a schematic 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 . Compared with the display device 20 shown in FIG. 2 , the display device 40 shown in FIG. 4 is different in 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 surfaces on opposite sides of the substrate 110 , eg, 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 backside 102 of the substrate 110 . In this way, the visible light reflected by the metasurface structure group 120 does 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 absorbing layer. Meanwhile, by setting the metasurface structure group 120 to control the phase delay of the electromagnetic wave, beam steering of the electromagnetic wave can be realized, so that the display device 40 helps to extend the transmission distance of the electromagnetic wave.

FIG. 5A is a schematic plan view of a metasurface structure group 520 according to an embodiment of the present invention. FIG. 5B is a graph showing the phase delay of electromagnetic waves generated by the metasurface structure group 520 in FIG. 5A . Compared with the metasurface structure group 120 shown in FIGS. 1A to 1B , the metasurface structure group 520 shown in FIG. 5A is different in that the metasurface structure group 520 may include metasurface structures 521 and 522 , and the metasurface structure group 520 The surface structures 521, 522 may have the same shape as each other, but different sizes from each other. For example, in this embodiment, the metasurface structure 521 may include a square ring structure 521a and a block structure 521b, and the metasurface 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 that 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 that of the block structure 522b.

Referring to FIG. 5B , since the metasurface structures 521 and 522 with different sizes have different resonance frequencies of electromagnetic waves, the electromagnetic waves will obtain different phase delays after being acted on by the metasurface structures 521 and 522 with different sizes. In this way, the phase delay of the electromagnetic wave can be controlled by the size of the metasurface structures 521, 522, and the emission angle of the electromagnetic wave can be controlled by the size change of the metasurface structures 521, 522, so as to realize beam steering. effect. In addition, the metasurface structure group 520 shown in FIG. 5A can also be applied to the display devices 10 , 20 , 30 , and 40 of the foregoing embodiments.

FIG. 6A is a schematic plan view of a metasurface structure group 620 according to an embodiment of the present invention. FIG. 6B is a graph showing the phase delay of electromagnetic waves generated by the metasurface structure group 620 in FIG. 6A . Compared with the metasurface structure group 120 shown in FIGS. 1A to 1B , the metasurface structure group 620 shown in FIG. 6A is different in that the metasurface structure group 620 may include metasurface structures 621 , 622 , 623 , 624, and the metasurface structures 621, 622, 623, 624 may have the same shape as each other, but different orientations from each other. For example, in this embodiment, the metasurface structure 621 may include a square ring structure 621a and a square structure 621b, the metasurface structure 622 may include a square ring structure 622a and a square structure 622b, and the metasurface structure 623 may include a square ring structure 623a and block structure 623b, and the metasurface 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 square 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 that the metasurface structure 621 is rotated 45 degrees clockwise, the orientation of the metasurface structure 623 may be that the metasurface structure 621 is rotated 90 degrees clockwise, and the orientation of the metasurface structure 624 may be Surface structure 621 is rotated 135 degrees clockwise.

Referring to FIG. 6B , since the metasurface structures 621 , 622 , 623 , and 624 with different orientations have different resonance frequencies of electromagnetic waves, the electromagnetic waves will obtain different phase delays after being acted on by the metasurface structures 621 , 622 , 623 , and 624 with different orientations. In this way, the phase delay of the electromagnetic wave can be controlled by the azimuth of the metasurface structures 621, 622, 623, 624, and the emission angle of the electromagnetic wave can be controlled by the azimuth change of the metasurface structures 621, 622, 623, 624, thereby Achieve the effect of beam steering. In addition, the metasurface structure group 620 shown in FIG. 6A can also be applied to the display devices 10 , 20 , 30 , and 40 of the foregoing embodiments.

FIG. 7A is a schematic plan view of a metasurface structure group 720 according to an embodiment of the present invention. FIG. 7B is a graph showing the phase delay of electromagnetic waves generated by the metasurface structure group 720 in FIG. 7A . Compared with the metasurface structure group 120 shown in FIGS. 1A to 1B , the metasurface structure group 720 shown in FIG. 7A is different in that the metasurface structure group 720 may include metasurface structures 721 , 722 , 723 , 724, 725, and the metasurface structures 721, 722, 723, 724, 725 may have the same shape as each other, but different sizes from each other. For example, in this embodiment, the metasurface structure 721 may include a square ring structure 721a and a square structure 721b, the metasurface structure 722 may include a square ring structure 722a and a square structure 722b, and the metasurface structure 723 may include a square ring structure 723a And block structure 723b, metasurface structure 724 may include square ring structure 724a and block structure 724b, and metasurface structure 725 may include square ring structure 725a and block 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 also show a decreasing relationship.

Referring to FIG. 7B , since the metasurface structures 721 , 722 , 723 , 724 , and 725 with different sizes have different resonance frequencies of electromagnetic waves, the electromagnetic waves will be different after being acted on by the metasurface structures 721 , 722 , 723 , 724 , and 725 with different sizes. phase delay. In this way, the phase delay of the electromagnetic wave can be controlled by the size of the metasurface structures 721 , 722 , 723 , 724 , 725 , and the electromagnetic wave can be controlled by the size change of the metasurface structures 721 , 722 , 723 , 724 , 725 . The launch angle is used to achieve the effect of beam steering. In addition, the metasurface structure group 720 shown in FIG. 7A can also be applied to the display devices 10 , 20 , 30 , and 40 of the foregoing embodiments.

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

9 is a schematic diagram of a metasurface structure that may be used in embodiments of the present invention. In the above embodiment, the metasurface structures of the metasurface structure groups 120, 520, 620, 720, 821, 822, 823, and 824 may also have (a) straight bars, (b) chevrons, (c) Herringbone Anchor, (d) Cross, (e) Swastika, (f) Cross Ring, (g) Herringbone Ring, (h) Circle Ring, (i) Square Ring, (j) Hexagonal Ring, ( k) square, (l) hexagonal block, (m) round block, (n) sub-word, (o) end-fold cross ring, (p) herringbone ring-tripod and other shapes or a combination of the above shapes.

FIG. 10A is a simulation diagram of a comparative example. FIG. 10B is a simulation diagram according to an embodiment of the present invention. The simulations of the comparative example and the embodiment are all carried out using electromagnetic waves of 12 GHz under the same conditions. The difference between the comparative example and the embodiment is that the simulation of the embodiment is carried out using the display device 30 shown in FIG. 3 , while the simulation of the comparative example is This is performed after removing the metasurface structure group 120 and the visible light absorbing layer 140 from the display device 30 shown in FIG. 3 . It can be seen from the simulation result in FIG. 10A that the electromagnetic wave of vertical incidence will directly penetrate the display device and cannot provide the function of beam steering. However, the simulation results of FIG. 10B show that the electromagnetic waves of normal incidence can be mostly reflected and turned to about 30 to 40 degrees.

To sum up, the display device of the present invention can change the reflection or refraction angle of the electromagnetic wave arbitrarily to extend the transmission distance of the electromagnetic wave by providing the metasurface structure group which can turn the electromagnetic wave. In this way, display devices installed in various places (such as indoor TVs or outdoor video walls) can also help to improve the signal strength in signal dead areas, thereby improving the coverage of 5G mmWave.

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

10, 20, 30, 40, 80: Display device 101: Front side 102: back side 110: Substrate 120, 520, 620, 720, 821, 822, 823, 824: metasurface structure group 121, 122, 123: Metasurface Structures 121a, 122a, 123a: Square ring structure 121b, 122b, 123b: block structure 130, 131, 132: Display elements 140: visible light absorption layer 250: flat layer 521, 522: Metasurface Structure 521a, 522a: Square ring structure 521b, 522b: Block structure 621, 622, 623, 624: Metasurface Structures 621a, 622a, 623a, 624a: Square ring structure 621b, 622b, 623b, 624b: block structure 721, 722, 723, 724, 725: Metasurface Structures 721a, 722a, 723a, 724a, 725a: Square ring structure 721b, 722b, 723b, 724b, 725b: block structure A-A’: hatch line CW, CW': wire DC: drive element OP, OR: opening

FIG. 1A is a schematic plan view of a display device 10 according to an embodiment of the present invention. Fig. 1B is a schematic cross-sectional view taken along the section line A-A' of Fig. 1A. FIG. 1C is a graph showing the phase delay of electromagnetic waves generated by the metasurface structure group 120 of the display device 10 . FIG. 2 is a schematic cross-sectional view of a display device 20 according to an embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a display device 30 according to an embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of a display device 40 according to an embodiment of the present invention. FIG. 5A is a schematic plan view of a metasurface structure group 520 according to an embodiment of the present invention. FIG. 5B is a graph showing the phase delay of electromagnetic waves generated by the metasurface structure group 520 in FIG. 5A . FIG. 6A is a schematic plan view of a metasurface structure group 620 according to an embodiment of the present invention. FIG. 6B is a graph showing the phase delay of electromagnetic waves generated by the metasurface structure group 620 in FIG. 6A . FIG. 7A is a schematic plan view of a metasurface structure group 720 according to an embodiment of the present invention. FIG. 7B is a graph showing the phase delay of electromagnetic waves generated by the metasurface structure group 720 in FIG. 7A . FIG. 8 is a schematic plan view of a display device 80 according to an embodiment of the present invention. 9 is a schematic diagram of a metasurface structure that may be used in embodiments of the present invention. FIG. 10A is a simulation diagram of a comparative example. FIG. 10B is a simulation diagram according to an embodiment of the present invention.

10: Display device

110: Substrate

120: Metasurface Structure Group

121, 122, 123: Metasurface Structures

121a, 122a, 123a: Square ring structure

121b, 122b, 123b: block structure

131, 132: Display components

140: visible light absorption layer

A-A’: hatch line

OP, OR: opening

Claims (7)

A display device, comprising: a substrate; a plurality of metasurface structure groups located on the substrate, and each of the metasurface structure groups includes a plurality of metasurface structures; a plurality of display elements located on the substrate, wherein the A display element is not coplanar with the metasurface structure group, the display element is located between the substrate and the metasurface structure group; and a visible light absorbing layer covers the metasurface structure. The display device of claim 1, further comprising a flat layer covering the display element and located between the metasurface structure group and the display element. The display device of claim 1, wherein the display element at least partially does not overlap the visible light absorbing layer. A display device, comprising: a substrate; a plurality of metasurface structure groups located on the substrate, and each of the metasurface structure groups includes a plurality of metasurface structures; a plurality of display elements located on the substrate, wherein the A display element is not coplanar with the metasurface structure group, the metasurface structure group is located between the substrate and the display element; and a visible light absorbing layer covering the metasurface structure, and the visible light absorbing layer is located in the between the display element and the metasurface structure group. The display device of claim 1 or 4, wherein each of the metasurface structure groups is the same as or different from each other. The display device of claim 1 or 4, wherein each of the metasurface structures in each of the metasurface structure groups has the same shape and different sizes from each other. The display device of claim 1 or 4, wherein each of the metasurface structures in each of the metasurface structure groups has the same shape and different orientations from each other.

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