Dual display device

Abstract

The present invention discloses a dual display element. The element may comprise a lower substrate, a color filter layer on the lower substrate, pixel electrodes on the color filter layer, a visible light switching layer on the pixel electrodes, an electrolyte layer on the visible light switching layer, an infrared radiation layer on the electrolyte layer, and an upper substrate on the infrared radiation layer.

Description

Technology Field

[0001] The present invention relates to a display element, and more specifically, to a dual display element capable of displaying a plurality of images. Background Technology

[0002] Generally, the most fundamental core principle of electrochromic devices widely used in smart windows is to form a layer on a transparent substrate capable of controlling the transmittance of sunlight using a material whose transmittance changes in response to variations in the electric field. Electrochromism refers to a phenomenon in which coloring and bleaching occur reversibly due to external electrochemical stimuli. In general, electrochromism involves electrons and ions (H) in reduction / oxidation coloring materials + , Li + It occurs through the insertion / extraction process of (etc.). Electrochromic materials include transition metal oxides such as tungsten, metal complexes such as Prussian blue, conductive polymers, and viologen-based materials. Transition metal oxides can be classified into reduction-colored materials and oxidation-colored materials. Reduction-colored materials are formed on the cathode and become colored when voltage is applied, as cations are inserted into the material layer and the metal in the metal oxide is simultaneously reduced; tungsten oxide is a representative material. Conversely, oxidation-colored materials are formed on the anode and become colored when voltage is applied, as cations are released from the material layer and the metal is oxidized; nickel oxide is a representative material. General electrochromic devices consist of a multilayer structure. It is a form in which an electrochromic material (reduction-colored material, oxidation-colored material, or both) is deposited in the form of a thin film on a transparent electrode, and an electrolyte is injected between them. The problem to be solved

[0003] The problem that the present invention aims to solve is to provide a dual display element capable of selectively displaying images of infrared light and visible light. means of solving the problem

[0004] The present invention discloses a dual display element. The element comprises: a lower substrate; a color filter layer on the lower substrate; pixel electrodes on the color filter layer; a visible light switching layer on the pixel electrodes; an electrolyte layer on the visible light switching layer; an infrared radiation layer on the electrolyte layer; and an upper substrate on the infrared radiation layer.

[0005] The infrared radiation layer may include multilayer graphene layers.

[0006] The above visible light switch layer may include an electrochromic layer.

[0007] The above visible light switch layer may include a metal oxide, viologen, or viologen derivative.

[0008] The above electrolyte layer may include an ionic liquid.

[0009] The pixel electrodes above may include a transparent metal.

[0010] The above lower substrate may include a reflective substrate.

[0011] The above lower substrate may include aluminum.

[0012] The above electrolyte layer may further include partition walls.

[0013] The above partition walls can be aligned with the boundaries of the pixel electrodes. Effects of the invention

[0014] As described above, the dual display element according to an embodiment of the present invention can selectively display images of infrared light and visible light by using a visible light switching layer and an infrared radiation layer on pixel electrodes. Brief explanation of the drawing

[0015] FIG. 1 is a plan view showing an example of a dual display element according to the concept of the present invention. Figure 2 is a cross-sectional view taken along line II' of Figure 1. Figure 3 is a cross-sectional view showing the image display principle of reflected light transmitted through the visible light switching layer of Figure 1. Figure 4 is a cross-sectional view showing the image display principle of infrared light from the infrared radiation layer of Figure 1. Figure 5 is a graph showing an example of the generalized emission power of infrared light according to the driving voltage provided to the infrared radiation layer of Figure 2. FIG. 6 is a cross-sectional view showing an example of a dual display element according to the concept of the present invention. Specific details for implementing the invention

[0016] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The advantages and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in different forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed content is thorough and complete and to ensure that the spirit of the present invention is sufficiently conveyed to those skilled in the art, and the present invention is defined only by the scope of the claims. Throughout the entire specification, the same reference numerals refer to the same components.

[0017] The terms used herein are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, 'comprises' and / or 'comprising' do not exclude the presence or addition of one or more other components, operations, and / or elements to the mentioned components, operations, and / or elements. Furthermore, as they are based on preferred embodiments, the reference numerals presented in the order of description are not necessarily limited to that order.

[0018] Additionally, the embodiments described herein will be explained with reference to cross-sectional and / or plan views, which are exemplary illustrations of the invention. In the drawings, the thicknesses of films and regions are exaggerated for effective explanation of the technical content. Accordingly, the shapes of the exemplary illustrations may be modified due to manufacturing techniques and / or tolerances, etc. Therefore, the embodiments of the invention are not limited to the specific shapes depicted but include variations in shape resulting from the manufacturing process.

[0019] FIG. 1 shows an example of a dual display element (100) according to the concept of the present invention. FIG. 2 shows a cutaway section along line II' of FIG. 1.

[0020] Referring to FIGS. 1 and 2, the dual display element (100) of the present invention may include an infrared light and a visible light display element. According to one example, the dual display element (100) of the present invention may include a lower substrate (10), a color filter layer (20), pixel electrodes (30), a visible light switching layer (40), an electrolyte layer (50), an infrared radiation layer (60), and an upper substrate (70).

[0021] A lower substrate (10) may be provided below a color filter layer (20). According to one example, the lower substrate (10) may be a reflective substrate. For example, the lower substrate (10) may comprise aluminum. Alternatively, the lower substrate (10) may comprise tungsten or indium, but the invention is not limited thereto. The lower substrate (10) may reflect external light (80 in FIG. 3).

[0022] A color filter layer (20) may be provided on a lower substrate (10). The color filter layer (20) may include an organic layer of polymer. The color filter layer (20) may display red, green, and blue.

[0023] Pixel electrodes (30) may be provided on a color filter layer (20). The pixel electrodes (30) may include transparent electrodes. For example, the pixel electrodes (30) may include Indium Tin Oxide (ITO). The pixel electrodes (30) may transmit external light (80) and reflected light (82 in FIG. 3). Although not illustrated, the pixel electrodes (30) may be connected to a thin-film transistor and receive a driving voltage applied by the thin-film transistor.

[0024] A visible light switching layer (40) may be provided on pixel electrodes (30). According to one example, the visible light switching layer (40) may include an electrochromic layer. The visible light switching layer (40) may include a nickel oxide, iridium oxide, vanadium oxide, titanium oxide, or tungsten oxide or a metal oxide layer. Additionally, the visible light switching layer (40) may include a viologen or a viologen derivative. Furthermore, the visible light switching layer (40) may include a metal-organic complex material. The visible light switching layer (40) may absorb or transmit external light (80) and reflected light (82) based on the voltage between the infrared radiation layer (60) and the pixel electrodes (30).

[0025] An electrolyte layer (50) may be provided on a visible light switching layer (40). According to one example, the electrolyte layer (50) may comprise an ionic liquid. The ionic liquid may comprise at least one of anions of bis(fluorosulfonyl)imide (FSI), bis(trifluoromethanesulfonyl)imide (TFSI) and hexafluorophosphate (PF6), and at least one of cations of imidazolium (XMI), piperidinium (PIP), and pyrrolidinium. In imidazolium, X may be a methyl group, an ethyl group, an isopropyl group, a butyl group, and a phenyl group. Additionally, the electrolyte layer (50) may further comprise lithium ions. The electrolyte layer (50) may comprise a liquid electrolyte in which the ionic liquid and a lithium salt are mixed. The lithium salt may comprise Li(FSI) and Li(TSFI). The electrolyte layer (50) may be provided in the form of an ion gel having a polymer network or sealed between the infrared radiation layer (60) and the visible light switching layer (40). Additionally, the electrolyte layer (50) may further comprise a solvent mixed with an ionic liquid and a lithium salt. The solvent may include ethylene carbonate and propylene carbonate. Furthermore, the electrolyte layer (50) may further comprise a liquid or solid electrolyte containing a lithium salt or hydrogen ions. For example, the electrolyte layer (50) may comprise a porous material in the form of a gel impregnated in a solution of LiClO4 and propylene carbonate.

[0026] An infrared radiation layer (60) may be provided on an electrolyte layer (50). The infrared radiation layer (60) may comprise a multilayer graphene layer. The infrared radiation layer (60) may comprise 2 to 12 graphene sheets. 13 or more graphene sheets may reduce the transmittance of external light (80) and reflected light (82). Each of the graphene sheets may be formed by a transferring method. Alternatively, each of the graphene sheets may be formed by a wet coating method of graphene flakes, but the invention is not limited thereto. The infrared radiation layer (60) may be a flat layer formed over the entire upper surface of the electrolyte layer (50). Although not illustrated, the infrared radiation layer (60) may be arranged in a matrix form corresponding to the pixel electrodes (30). The infrared radiation layer (60) may display an image of infrared light based on the voltage to the pixel electrodes (30).

[0027] An upper substrate (70) may be provided on an infrared radiation layer (60). The upper substrate (70) may include a transparent substrate. For example, the upper substrate (70) may include a transparent inorganic material such as soda-lime glass, alkali-free glass, quartz glass, or sapphire. Alternatively, the upper substrate (70) may include a transparent organic polymer material such as polyethylene phthalate (PET), polyethylene, polycarbonate, or polyimide, but the invention is not limited thereto. The upper substrate (70) of the organic polymer material may have a thickness of 100 μm or less.

[0028] Although not illustrated, a metal mesh layer may be provided between the upper substrate (70) and the infrared radiation layer (60). The metal mesh layer may include a conductive metal such as aluminum, gold, silver, platinum, chromium, or nickel. The metal mesh layer may have an area ratio of about 30% or less of the total planar area of ​​the dual display element (100).

[0029] Figure 3 shows the principle of image display of reflected light (82) transmitted through the visible light switching layer (40) of Figure 1.

[0030] Referring to FIG. 3, when a first driving voltage (V1) is provided between the visible light switching layer (40) and the infrared radiation layer (60), reflected light (82) can be generated. The first driving voltage (V1) can charge the visible light switching layer (40) with a negative charge and charge the infrared radiation layer (60) with a positive charge. The visible light switching layer (40) can absorb positive ions (52) from the electrolyte layer (50). The visible light switching layer (40) of nickel oxide can be reduced to become transparent. The visible light switching layer (40) can transmit external light (80) to the lower substrate (10) and transmit reflected light (82) to the outside. The external light (80) and the reflected light (82) can be visible light. Thus, the dual display element (100) of the present invention can display an image of visible light during the day or under lighting. The infrared radiation layer (60) can absorb negative ions (54) from the electrolyte layer (50). The infrared radiation layer (60) can emit infrared light (84) at a low intensity.

[0031] Figure 4 shows the principle of image display of infrared light (84) of the infrared radiation layer (60) of Figure 1.

[0032] Referring to FIG. 4, when a second driving voltage (V2) is provided between the visible light switching layer (40) and the infrared radiation layer (60), infrared light (84) can be emitted from the infrared radiation layer (60) without reflected light (82). The second driving voltage (V2) may have a phase opposite to that of the first driving voltage (V1). The second driving voltage (V2) can charge the visible light switching layer (40) with a positive charge and charge the infrared radiation layer (60) with a negative charge. The visible light switching layer (40) may provide or emit positive ions (52) to the electrolyte layer (50). The visible light switching layer (40) of nickel oxide may be oxidized and become opaque. The visible light switching layer (40) may absorb external light (80) and reflected light (82). The infrared radiation layer (60) can provide or emit negative ions (54) to the electrolyte layer (50). The infrared radiation layer (60) can emit infrared light (84). The second driving voltage (V2) can emit infrared light (64) at a higher intensity than the first driving voltage (V1). Thus, the dual display element (100) of the present invention can display an image of infrared light without displaying an image of visible light at night.

[0033] Ultimately, the dual display element (100) of the present invention can display a visible light image of reflected light (82) during the day and selectively display an infrared light (84) image at night.

[0034] FIG. 5 shows an example of the generalized emission power of infrared light according to the driving voltage provided to the infrared radiation layer (60) of FIG. 2.

[0035] Referring to FIG. 5, the generalized emission power of the infrared light (84) of the infrared radiation layer (60) can be maximized at about 1.0 at about 2V or less and decrease to about 0.4 or less at about 3V or more. Accordingly, the infrared radiation layer (60) can emit infrared light (84) using a second driving voltage (V2) of about 2V or less to display an infrared image.

[0036] FIG. 6 shows an example of a dual display element (100) according to the concept of the present invention.

[0037] Referring to FIG. 6, the dual display element (100) of the present invention may further include partition walls (90). The partition walls (90) may be provided within the electrolyte layer (50). The partition walls (90) may be aligned with the boundaries (32) of the pixel electrodes (30). The partition walls (90) may include a ceramic dielectric or an insulating polymer. Each of the partition walls (90) may have a rectangular cross-section in the vertical view. The partition walls (90) can eliminate electric field interference of the pixel electrodes (30) within the electrolyte layer (50) and increase the image resolution of the infrared light (84).

[0038] The lower substrate (10), color filter layer (20), pixel electrodes (30), visible light switching layer (40), electrolyte layer (50), infrared radiation layer (60), and upper substrate (70) can be configured in the same way as in FIG. 2.

[0039] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive.

Claims

Claim 1 A dual display element comprising: a lower substrate; a color filter layer on the lower substrate; pixel electrodes on the color filter layer; a visible light switching layer on the pixel electrodes; an electrolyte layer on the visible light switching layer; an infrared radiation layer provided on the electrolyte layer and comprising multilayer graphene layers; an upper substrate on the infrared radiation layer; and partition walls provided within the electrolyte layer and connected between the visible light switching layer and the infrared radiation layer, wherein the multilayer graphene layers of the infrared radiation layer contact the electrolyte layer to absorb negative ions within the electrolyte layer and emit infrared light at a first intensity to transmit a visible light image provided by the color filter layer and the visible light switching layer during the day, and emit the negative ions into the electrolyte layer and emit the infrared light at a second intensity higher than the first intensity to display an infrared image at night, and wherein the partition walls are aligned at the boundaries of the pixel electrodes. Claim 2 delete Claim 3 In claim 1, the visible light switching layer is a dual display element comprising an electrochromic layer. Claim 4 In claim 1, the visible light switching layer comprises a metal oxide, viologen, or viologen derivative, forming a dual display device. Claim 5 In claim 1, the electrolyte layer comprises an ionic liquid, forming a dual display element. Claim 6 In claim 5, the electrolyte layer further comprises lithium ions, forming a dual display device. Claim 7 In claim 1, the pixel electrodes comprise a transparent metal, forming a dual display element. Claim 8 In claim 1, the lower substrate is a dual display element including a reflective substrate. Claim 9 In claim 1, the lower substrate is a dual display element comprising aluminum. Claim 10 delete Claim 11 delete

Images