Metal mesh touch display device

Abstract

The invention provides a metal grid touch display device which comprises a metal grid touch unit, a metal grid display unit, a metal grid display unit and a metal grid display unit. The grid line width of the metal grid touch unit is larger than 2.5 micrometers and / or the grid node area of the metal grid touch unit is larger than 80 micrometers < 2 >. The display unit comprises a plurality of light-emitting pixels, and the density of the light-emitting pixels of the display unit is larger than 150 ppi; the microstructure layer is arranged between the display unit and the metal grid touch unit and is provided with a base material layer and a microstructure; the distance between the surface of the display unit and the metal grid touch unit is larger than 0.2 mm. Wherein the astigmatism microstructure is arranged between the display unit and the metal grid touch unit, and the distance between the display unit and the metal grid touch unit is properly adjusted, so that the gray grid problem can be solved under the condition that the pixel configuration of the display unit and the size of the metal grid do not need to be changed.

Description

TECHNICAL FIELD

[0001] The present application relates to a metal mesh touch display device, in particular to a display device with a diffraction microstructure between a display unit and a metal mesh touch unit. BACKGROUND

[0002] In recent years, touch display devices have become mainstream in the display device market. Currently, metal mesh technology uses fine silver or copper wires with high conductivity to form a mesh as a touch electrode, thus having good conductivity and being advantageous in large-sized touch display devices. For example, high-end notebook computers on the market usually have a pen writing function, and the high-conductivity metal mesh can meet the low-delay specifications of pen writing.

[0003] However, due to the light-blocking property of the metal fine wires, when the light-emitting unit (pixel) of the display device and the metal mesh are not properly designed, optical interference will occur, resulting in visual degradation. For example, when the size of the metal fine wires does not match the pixel light-emitting area of the display device, the metal mesh may block part of the light emitted by the pixel, causing a shadow and the user will observe a gray grid phenomenon.

[0004] To analyze the causes of the gray grid problem, the existing technical solution is to increase the pixel area or change the design of the metal mesh (such as size or pattern).

[0005] However, for touch module assembly factories, their task is to assemble the display unit provided by the upstream supplier, such as OLED or LCD, with the touch module. The specifications of the display unit provided by the upstream supplier are basically fixed and cannot be arbitrarily changed. Therefore, the solution to the gray grid problem by increasing the pixel area is not feasible for touch module assembly factories. Moreover, increasing the pixel area means reducing the resolution density (or pixel density or pixels per inch; ppi) of the display device accordingly, which does not meet the market demand for high resolution.

[0006] On the other hand, in consideration of commercial mass production, the metal mesh manufacturing technology selected by the touch module factory is a set of process with lower cost and higher yield, and other unverified processes (such as laboratory small amount test processes) cannot be used to manufacture metal mesh. For example, CN105892737 utilizes a special metal mesh included angle to form alignment with the pixels of the display to improve the Moiré effect problem, but as described above, such specially designed metal lines are not necessarily suitable for mass production. Furthermore, reducing the width of the metal lines can theoretically reduce the probability of pixel light being blocked by the metal lines, but reducing the line width will increase the impedance of the metal lines, thereby reducing touch sensitivity, so the scheme of solving the gray grid problem by adjusting the size of the metal mesh is also not feasible.

[0007] Therefore, in view of the above deficiencies, the present application is generated. SUMMARY

[0008] In view of the above technical bottlenecks, the purpose of the present application is to provide a metal mesh touch display device which can solve the gray grid problem without changing the pixel configuration of the display unit and the size of the metal mesh.

[0009] According to an embodiment of the present application, a metal mesh touch display device is provided, comprising: a metal mesh touch unit, the grid line width of which is greater than 2.5μm and / or the grid node area is greater than 80μm 2 ; a display unit comprising a plurality of light emitting pixels, the light emitting pixel density of the display unit being greater than 150ppi; and a microstructure layer between the display unit and the metal mesh touch unit, and having a substrate layer and a microstructure; wherein the distance between the surface of the display unit and the metal mesh touch unit is greater than 0.2mm.

[0010] According to an embodiment of the present application, wherein at least one surface of the microstructure has a plurality of convex portions, a plurality of concave portions, or a combination thereof to form a diffraction structure; or the microstructure is a diffraction structure composed of a plurality of convex portions, a plurality of concave portions, or a combination thereof.

[0011] According to an embodiment of the present application, wherein the grid line width is greater than 3.5μm and / or the grid node area is greater than 100μm 2 .

[0012] According to an embodiment of the present application, wherein the light emitting pixel density of the display unit is between 150-400ppi.

[0013] According to an embodiment of the present application, the microstructure layer further comprises an upper adhesive layer and a lower adhesive layer, wherein the upper adhesive layer is disposed under the metal mesh touch unit; the substrate layer is disposed on the lower surface of the upper adhesive layer and has a flat shape; the microstructure is disposed on the lower surface of the substrate layer, and the lower surface of the microstructure has a diffraction structure composed of a plurality of convex portions, a plurality of concave portions, or a combination thereof; and the lower adhesive layer is disposed between the lower surface of the microstructure and the display unit, and the upper surface of the lower adhesive layer has a shape matching the lower surface of the microstructure.

[0014] According to an embodiment of the present application, the microstructure is disposed on the lower surface of the substrate layer, and the upper surface of the microstructure has a diffraction structure composed of a plurality of convex portions, a plurality of concave portions, or a combination thereof, and the lower surface of the substrate layer has a shape matching the upper surface of the microstructure.

[0015] According to an embodiment of the present application, the microstructure layer further comprises a lower adhesive layer and an upper adhesive layer, wherein the lower adhesive layer is disposed on the display unit; the substrate layer is disposed on the upper surface of the lower adhesive layer and has a flat shape; the microstructure is disposed on the upper surface of the substrate layer and is composed of a plurality of convex portions; and the upper adhesive layer is disposed between the upper surfaces of the microstructure and the substrate layer and the metal mesh touch unit, and the lower surface of the upper adhesive layer has a shape matching the upper surfaces of the microstructure and the substrate layer.

[0016] According to an embodiment of the present application, the metal mesh touch unit comprises: a first metal mesh oriented in a first direction; a second metal mesh oriented in a second direction; and a base layer between the first metal mesh and the second metal mesh.

[0017] According to another embodiment of the present application, a metal mesh touch display device is provided, comprising: a metal mesh touch unit, the grid line width of which is greater than 2.5 μm and / or the grid node area is greater than 80 μm 2 ; a display unit comprising a plurality of light-emitting pixels, the smallest light-emitting pixel in the display unit having an area between 400-900 μm 2 ; and a microstructure layer between the display unit and the metal mesh touch unit and having a substrate layer and a microstructure; wherein the distance between the surface of the display unit and the metal mesh touch unit is greater than 0.2 mm.

[0018] According to the other embodiment of the present application, the microstructure is a diffraction structure composed of a plurality of convex portions, a plurality of concave portions, or a combination thereof.

[0019] In summary, according to the metal mesh touch display device of the present application, by providing the light dispersion microstructure between the display unit and the metal mesh touch unit and appropriately adjusting the distance between the display unit and the metal mesh touch unit, the problem of gray grid can be solved without changing the display unit provided by the upstream supplier and without adjusting the size of the metal mesh.

[0020] In summary, according to the metal mesh touch display device of the present application, by providing the light dispersion microstructure between the display unit and the metal mesh touch unit and appropriately adjusting the distance between the display unit and the metal mesh touch unit, the problem of gray grid can be solved without changing the display unit provided by the upstream supplier and without adjusting the size of the metal mesh. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Schematic diagram of the light dispersion effect of the microstructure of the present application;

[0022] Figure 2 Schematic diagram of the metal mesh touch display device of the first embodiment of the present application;

[0023] Figure 3A Schematic diagram of the metal mesh touch unit of the present application;

[0024] Figure 3B Schematic diagram of the metal mesh touch display device of the fourth embodiment of the present application; and Figure 3A Schematic diagram of the metal mesh touch display device of the fourth embodiment of the present application; and

[0025] Figure 4 Schematic diagram of the metal mesh touch display device of the first embodiment of the present application;

[0026] Figure 5 Schematic diagram of the metal mesh touch display device of the first embodiment of the present application;

[0027] Figure 6 Schematic diagram of the metal mesh touch display device of the fourth embodiment of the present application; and

[0028] Figure 7 Schematic diagram of the metal mesh touch display device of the fourth embodiment of the present application; and

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1, 2, 3, 4, 5: metal mesh touch display device

[0031] 10: display unit

[0032] 10A: upper surface

[0033] 20: first adhesive layer

[0034] 30, 31, 32, 33: microstructure layer

[0035] 31a, 33d: upper adhesive layer

[0036] 31b, 32a, 33b: base material layer

[0037] 31c, 32b, 33c: Microstructure

[0038] 31d, 33a: lower adhesive layer

[0039] 40: Second adhesive layer

[0040] 50:Metal mesh touch unit

[0041] 50a: first metal grid

[0042] 50b: Grassroots

[0043] 50c: Second metal grid

[0044] 51: lower surface

[0045] 52: Metal wire

[0046] 53: Grid Node

[0047] 100: Luminous light spots

[0048] 200: Secondary spot

[0049] a: area

[0050] d: line width DETAILED DESCRIPTION

[0051] The following will describe the embodiments of the present invention in detail with reference to the accompanying drawings, from which the advantages, features and methods of achieving the present invention will become apparent. However, it should be noted that the present invention is not limited to the following embodiments, but can be implemented in various forms.

[0052] The terms used herein are only used to describe specific embodiments and are not intended to limit the present invention. Unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" used herein also include the plural forms.

[0053] Furthermore, it will be understood that, when used in this specification and claims, spatially relative terms such as "beneath", "below", "lower", "under", "above", "upper", "on", "directly on", "left", "right", and the like can be used for describing an element's relationship to another element as

[0054] In addition, unless explicitly stated otherwise, numeric values referred to herein are not absolute and can be considered approximate, i.e., having an error or range as indicated by "about", "approximately", or "substantially", as would be understood by one of ordinary skill in the art, that the numeric value referred to can include manufacturing tolerances, measurement errors, etc., that can be within plus or minus 20%, or within plus or minus 10%, or within plus or minus 5%.

[0055] It should also be understood that, although the terms "first", "second", etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a first element in some embodiments could be termed a second element in other embodiments without departing from the teachings of the present disclosure. In the description herein, like numbers refer to like elements.

[0056] Any of the technical features described in any embodiment described in this specification can be applicable to other embodiments of the present disclosure, without producing contradictions, including thickness, shape, material, refractive index, etc.

[0057] Please refer to Figure 2 The first embodiment of the present disclosure provides a metal mesh touch display device 1, comprising: a metal mesh touch unit 50, the grid line width of which is greater than 2.5 μm and / or the grid node area is greater than 80 μm 2 ; a display unit 10 comprising a plurality of light emitting pixels, the light emitting pixel density of the display unit 10 is greater than 150 ppi; and a microstructure layer 31 between the display unit 10 and the metal mesh touch unit 50, and having a substrate layer 31b and a microstructure 31c, the microstructure layer 31 can define a distance (for example, greater than 0.2 mm) between the display unit 10 and the metal mesh touch unit 50, reduce the shielding of the display unit 10 by the metal mesh touch unit 50, and thus the viewer cannot visually feel the influence of the metal mesh touch unit 50.

[0058] Preferably, the width of the grid line of the metal grid touch unit 50 is greater than 2.5 μm and the area of the grid node is greater than 80 μm 2

[0059] In a preferred embodiment, the width of the grid line of the metal grid touch unit 50 is greater than 3.5 μm and less than 5 μm, or the area of the grid node of the metal grid touch unit 50 is greater than 100 μm 2 and less than 200 μm 2 or the metal grid touch unit 50 has both of the above two sizes.

[0060] In the present application, the display unit 10 can be an organic light emitting display unit (OLED), a liquid crystal display unit (LCD), or other display units; the metal grid touch unit 50 can be a metal grid made of copper (Cu) or silver (Ag), but is not limited thereto.

[0061] The present application is directed to a high resolution display unit 10, which is prone to be blocked by the metal line due to the small area of the sub-pixel. Specifically, the high resolution display unit 10 refers to a display unit with a pixel density of 150-1000 ppi, or 150-800 ppi, or 150-400 ppi, or 150-300 ppi. In the first embodiment of the present application, the display unit 10 is a 14-inch OLED display with a resolution of 1920x1200, and the pixel density thereof is calculated to be 162 ppi. The OLED display of the present embodiment has R (red), G (green), and B (blue) sub-pixels arranged side by side, each of which independently emits light with adjustable brightness, and the color light is presented after the light of different gray scales and different colors is mixed.

[0062] In another embodiment, the display unit 10 is a 15-inch OLED display with a resolution of 1920x1200, and the pixel density thereof is 151 ppi; in another embodiment, the display unit 10 is a 13-inch OLED display with a resolution of 1920x1200, and the pixel density thereof is 174 ppi; in another embodiment, the display unit 10 is a 13-inch LCD display with a resolution of 2560x1600, and the pixel density thereof is 232 ppi. The calculation of the pixel density herein can be obtained by using the pixel density calculator disclosed on the Internet, such as the website https: / / ppi.0123456789.tw / , but is not limited thereto.

[0063] It is worth noting that the present invention mainly solves the problem of the light emission of the display unit 10 being blocked by the metal wires, and the R, G, B sub-pixels or other color (such as white) sub-pixels of the organic light emitting display unit (OLED) are actively luminous, so the present invention can be used in OLED application products; in addition, the RGB light of the LCD is displayed by the light of the backlight module passing through the color filter (non-active luminescence), but the present invention can also solve the problem of the LCD backlight being blocked by the metal wires through the microstructure layer 31. In other words, regardless of the light emission mode of the display, the present invention can improve or eliminate the gray grid problem through the microstructure layer 31 without changing the display unit 10 and the metal grid touch unit 50. The present invention can solve the problem of high-resolution displays (for example, pixel density greater than 250ppi) with metal grid fine lines of specific specifications (for example, line width greater than 2.5μm, node area greater than 80μm 2 ) causes visual loss to the viewer.

[0064] Please refer to Figure 3A 、 Figure 3B The metal mesh touch unit 50 mainly includes a plurality of connected metal wires 52 (or metal microwires). This technology is generally referred to as metal mesh (abbreviated as MM) in the art. This technology can be described by metal wire width or node area. The metal wire width and node area can be designed independently, and there is no certain correlation between the two. The intersection of the metal wires 52 will form a mesh node 53. The minimum line width of the metal wire 52 (hereinafter referred to as line width d) is between about 1.5 and 5.0 μm (for example, 2 μm), or between 2.5 and 4.5 μm, or between 3.0 and 3.5 μm; the area of ​​the mesh node 53 is between about 40 and 200 μm. 2 Between (e.g. 80 μm 2 or 100 μm 2 ), or 50-100 μm 2 Between, or 60 ~ 80μm 2 The metal mesh touch unit 50 of the first embodiment of the present invention uses copper microwires with line widths d of 3.5, 4, and 4.5 μm. The area of ​​the mesh nodes 53 formed by the copper wires of the three line widths is 100 μm. 2 According to the following embodiments (see Table 1), the present invention can improve the gray grid phenomenon to avoid visual effect degradation.

[0065] In the metal mesh touch display device 1 of the present invention, a microstructure layer 31 is provided between the display unit 10 and the metal mesh touch unit 50, and the thickness of the microstructure layer 31 is appropriately adjusted so that the distance between the display unit 10 and the metal mesh touch unit 50 is minimized. For example, the display unit 10 faces the first surface (i.e., the first surface) of the metal mesh touch unit 50. Figure 2The upper surface 10A of the display unit 10 is shown to be spaced apart from the second surface of the metal mesh touch unit 50 (i.e. Figure 2 The distance between the lower surface 51 of the metal mesh touch unit 50 and the upper surface 10A of the display unit 10 is greater than or equal to 0.2 mm, so as to moderately separate the light source (display unit 10) from the shield (metal mesh touch unit 50), and thus the shadow area of the light source (to the far viewer) can be reduced, so as to reduce the gray scale level. On the other hand, the relationship between the light source, the object and the shadow can also be explained from the theory of straight-line propagation of light. When the light encounters an obstacle that cannot be penetrated, a shadow will be generated behind the object. In the present application, when the R or G or B sub-pixel emits light (i.e. the light source) and the metal wire 52 forms an obstacle in front of it (i.e. the obstacle), a shadow is formed which is observed by the viewer, forming the aforementioned gray scale. According to this theory, the closer the distance between the obstacle and the light source, the greater the shadow will be, and the more easily the viewer will observe the shadow (i.e. the gray scale). In other words, the present application reduces the size of the shadow by separating the obstacle and the light source, so as to reduce the visual defect of the shadow observed by the viewer.

[0066] However, considering the thinness of the display device, the distance between the upper surface 10A of the display unit 10 and the lower surface 51 of the metal mesh touch unit 50 should not be too large, for example, the aforementioned distance is preferably less than 1 mm, or less than 0.6 mm.

[0067] In addition, in the present application, the microstructure 31c has a non-flat surface, which can provide a diffusion effect, so that a single light spot 100 is moderately diffused into a plurality of dispersed secondary light spots 200 (as shown in Figure 1 The light spot 100 can also be explained as a primary light spot formed by the light source, which is diffused by the microstructure 31c into a plurality of dispersed secondary light sources (i.e. secondary light spots 200), so as to reduce the proportion or probability of the light source (i.e. the single light spot) being shielded by the metal wire 52, so as to reduce the aforementioned gray scale problem caused by the light being shielded by the metal wire 52. That is, for the RGB sub-pixels of the first embodiment, the light emitted by each sub-pixel is dispersed by the microstructure 31c into a plurality of lights, and the effect after diffusion is as shown in Figure 2 Accordingly, due to the aforementioned dispersion effect, the probability and / or energy of the light emitted by each sub-pixel being shielded by the metal mesh touch unit 50 is reduced.

[0068] For example, at least one surface of the microstructure 31c may have a light-scattering structure composed of multiple convex portions, multiple concave portions, or a combination thereof; alternatively, the microstructure 31c may be a light-scattering structure composed of multiple convex portions, multiple concave portions, or a combination thereof. Thus, the microstructure 31c can provide an effect similar to that of a convex lens or a concave lens. For each single light source, the point light source emitted by it is scattered and appropriately diffused into multiple point light sources, thereby reducing the probability of being blocked and reducing the brightness difference between shadowed and non-shadowed areas. Therefore, the microstructure of the present invention can also be referred to as a "light-scattering microstructure." In summary, the present invention utilizes the synergistic effects of "dispersing the light source" and "increasing the distance between the obstruction (i.e., the metal wire) and the light source (i.e., the display's light)" to address the visual disadvantage caused by metal wire 52 blocking the light source. In a comparative example, even when the distance between the upper surface 10A of the display unit 10 and the lower surface 51 of the metal mesh touch unit 50 was set to 0.18 mm, the user still observed the aforementioned grayscale issue.

[0069] In addition, the microstructure layer 31 of the present invention may further include an adhesive layer, for example, disposed on the uppermost layer and / or the lowermost layer.

[0070] Please return Figure 2 As shown, the microstructure layer 31 according to the first embodiment of the present invention further includes an upper adhesive layer 31 a and a lower adhesive layer 31 d to bond the microstructure layer 31 to other components.

[0071] Specifically, in the first embodiment of the present invention, the upper adhesive layer 31a is arranged under the metal grid touch unit 50; the substrate layer 31b is arranged on the lower surface of the upper adhesive layer 31a and has a flat shape; the microstructure 31c is arranged on the lower surface of the substrate layer 31b, and the upper surface of the microstructure 31c has a flat shape, while the lower surface of the microstructure 31c is a wavy shape having a combination of multiple protrusions and multiple recesses; and the lower adhesive layer 31d is arranged between the lower surface of the microstructure 31c and the display unit 10, and the upper surface of the lower adhesive layer 31d has a shape that matches the lower surface of the microstructure 31c, and the lower adhesive layer 31d can be used to bond the display unit 10.

[0072] Although Figure 2 In the first embodiment shown, only one surface of the microstructure 31c has a non-flat shape. However, the present invention is not limited thereto, and the microstructure in any embodiment may be configured to have non-flat shapes on both the upper and lower surfaces, such as convex portions, concave portions, or a wavy shape (as described herein, the wavy shape may preferably be a sine wave), as long as it has a light-scattering effect. In the embodiment of the present invention, the microstructure 31c of the microstructure layer 31 may adjust the light emitted by a single light source into a non-flat shape. Figure 1The plurality of sub-light spots 200 shown are small in luminance and scattered around the main light spot. The positions of the sub-light spots 200 do not overlap with the main light spot, and the luminance is small, and in addition, the distance between the metal wires 52 and the light source (i.e., the light-emitting pixels) is pulled far apart, so the metal wires 52 / grid nodes 53 form a small shadow area (assuming here that the viewer is located at a position that is relatively far away). Under the action of the two mechanisms described above: the light dispersion mechanism (reducing the probability of the light source being blocked) and the shadow area reduction mechanism (reducing the shadow area generated), the problem of the gray grid caused by the metal wires 52 blocking the light of the display can be mitigated or eliminated.

[0073] In the case where both the upper and lower surfaces of the microstructure have a non-flat shape, a layer having a surface shape that cooperates with the corresponding surface of the microstructure, such as an adhesive layer or a substrate layer, can be provided on the upper and lower surfaces of the microstructure, respectively.

[0074] In the present application, the substrate layer on the flat surface side of the microstructure and the adhesive layer having a surface shape that cooperates with the non-flat surface of the microstructure can be used to support and protect the microstructure.

[0075] In the present application, in order to maintain the light transmittance of the display device, the layers on the outer side (the side facing the user) of the display unit 10, in addition to the metal mesh touch unit 50, are preferably made of a transparent material.

[0076] For example, the substrate layer can be made of a transparent plastic, glass, glass ceramic, or quartz (SiO2), etc. The transparent plastic material can be, for example, polymethyl methacrylate, polyethylene terephthalate, polyethylene naphthalate, or polycarbonate, etc., but is not limited thereto. The transparent glass can be, for example, alkali-free glass, soda-lime glass, phosphorus glass, or silicate glass, etc., but is not limited thereto.

[0077] For example, the microstructure can be made of an optical clear adhesive (OCA), such as silicone rubber, acrylic resin, unsaturated polyester, polyurethane, or epoxy resin, etc., but is not limited thereto.

[0078] Similar to the microstructure, in order to maintain the light transmittance of the display device, the adhesive layers (including the upper adhesive layers 31a and 33d, the lower adhesive layers 31d and 33a of the present application, and the first adhesive layer 20 and the second adhesive layer 40 hereinafter) can also be made of an optical clear adhesive (OCA), such as silicone rubber, acrylic resin, unsaturated polyester, polyurethane, or epoxy resin, etc., but are not limited thereto.

[0079] Specifically, in the first embodiment of the present application, the main component of the upper adhesive layer 31a can be acrylic resin, with a thickness of 50 μm, such as 3M CEF1902; the main component of the lower adhesive layer 31d can be acrylic resin, with a thickness of 100 μm, such as 3M CEF1904; the substrate layer 31b can be a polyester film with a thickness of 35-75 μm, and in the first embodiment of the present application, the thickness of the substrate layer 31b is 50 μm; the main component of the microstructure 31c can be acrylic resin, and the wavy protrusions are distributed on the defined plane of the microstructure 31c (a plane substantially perpendicular to the thickness direction of the microstructure layer 31), the distance between adjacent protrusions is between 6 μm and 10 μm, the height difference of the wavy protrusions (the distance between the position of the wave peak and the wave trough in the thickness direction) is between 1.4 μm and 1.7 μm, so the ratio of the depth to the width (or the height to the width) of the microstructure 32b is between 0.1 and 0.3. It should be noted that, due to the large number of microstructures 32b, the measurement data in this article can be understood as the result of general engineering statistical methods (such as the average value, etc.). In general, the thickness of the microstructure layer 31 of the first embodiment of the present application is about 0.2 mm.

[0080] In another embodiment, the cross section of the microstructure 31c is triangular, zigzag, sinusoidal, or semicircular (elliptical). In another embodiment, the distance between adjacent protrusions is between 0.1 μm and 50 μm, and the distance between adjacent protrusions can be varied, for example, the density of the protrusions is designed according to the relationship y = axn, where y is the distance between a certain position on the display and the center line of the display, n is between 1 and 3.5, and a is a constant related to the size of the illumination area; the height difference of the wavy protrusions (the distance between the position of the wave peak and the wave trough in the thickness direction) is between 1 μm and 2 μm, or between 1.4 μm and 1.7 μm. In a variant embodiment, the protrusions are randomly arranged on the plane of the microstructure 31c. In an embodiment, the ratio of the depth to the width (or the height to the width) of the microstructure 32b is between 0.1 and 1.5. n

[0081] In the case where the substrate layer has a flat shape and the interface between the microstructure and the adhesive layer is uneven, a layer of microstructure material can be applied on the substrate layer, and then the microstructure material layer is processed by laser engraving, etching, coating, printing, etc. to form the microstructure, and then the material of the adhesive layer is applied on the microstructure to fill the gaps on the uneven surface and form the adhesive layer.

[0082] ​In order to cause the light emitted by the display unit 10 to be scattered at the uneven interface, the layers on both sides of the uneven interface can be formed by materials having different refractive indexes, for example, the difference between the refractive indexes of the microstructure 31c and the lower adhesive layer 31d can be greater than 0.01, or greater than 0.1, or greater than 0.2; specifically, the refractive index of the adhesive layer 31d in contact with the microstructure 31c can be set to be less than the refractive index of the microstructure 31c. More specifically, the refractive index of the microstructure 31c is 1.5-1.7, and the refractive index of the adhesive layer 31d is 1.4-1.6.

[0083] Preferably, in the first embodiment of the present application, the refractive index of the microstructure 31c is 1.5 at a wavelength of 532 nm, and the refractive index of the adhesive layer 31d is 1.47 at a wavelength of 532 nm.

[0084] In addition, although in the first embodiment shown above the microstructure layer 31 has the upper adhesive layer 31a, the substrate layer 31b, the microstructure 31c, and the lower adhesive layer 31d in order from top to bottom, the present application is not limited thereto, and the microstructure layer in any embodiment can be inverted upside down, as long as it has the light scattering effect. Figure 2 In the first embodiment shown above, the microstructure layer 31 has the upper adhesive layer 31a, the substrate layer 31b, the microstructure 31c, and the lower adhesive layer 31d in order from top to bottom, however, the present application is not limited thereto, and the microstructure layer in any embodiment can be inverted upside down, as long as it has the light scattering effect.

[0085] In the present application, further additional adhesive layers (for example, the first adhesive layer 20 and the second adhesive layer 40 described below) can be provided on the outer surface of the microstructure layer to adhere the microstructure layer to other layers in the metal mesh touch display device, respectively.

[0086] In the present application, in the case where the microstructure in the microstructure layer and / or the outer surface of the substrate layer is in a flat shape and has adhesive properties, the microstructure layer can be adhered to other layers in the metal mesh touch display device without the lower adhesive layer and / or the upper adhesive layer, that is, the microstructure and / or the substrate layer in a flat shape and having adhesive properties can also be used as an adhesive layer.

[0087] The second embodiment of the present application is different from the first embodiment only in the microstructure layer 32, and the rest can refer to the foregoing content. As shown in the second embodiment of the metal mesh touch display device 2 of the present application, Figure 4 In the second embodiment of the metal mesh touch display device 2 of the present application, in the case where the outer surface of the substrate layer 32a and the microstructure 32b in the microstructure layer 32 are in a flat shape and have adhesive properties, the microstructure layer 32 can be directly adhered to other layers in the metal mesh touch display device 2, such as the display unit 10 and the metal mesh touch unit 50.

[0088] As shown in the second embodiment of the metal mesh touch display device 2 according to the present application, Figure 4 The metal mesh touch display device 2 according to the second embodiment of the present application is different from the first embodiment in that it does not include the upper adhesive layer 31a and the lower adhesive layer 31d.

[0089] In particular, in the metal mesh touch display device 2 of the second embodiment of the present application, the substrate layer 32a is provided under the metal mesh touch unit 50, the microstructure 32b is provided on the lower surface of the substrate layer 32a, the lower surface of the microstructure 32b has a flat shape, and the upper surface of the microstructure 32b has a wavy shape with a combination of a plurality of convex portions and a plurality of concave portions, the distance between adjacent convex portions is between 10 μm and 20 μm (the distribution of the convex portions can refer to the first embodiment), the height of the convex portions is about 10 μm, and thus the ratio of the depth to the width (or the ratio of the height to the width) of the microstructure 32b is about 0.5 to 1. In addition, the lower surface of the substrate layer 32a has a shape matched with the upper surface of the microstructure 32b. The thickness of the microstructure 32b and the thickness of the substrate layer 32a are both about 0.1 mm, and thus the thickness of the microstructure layer 32 of the second embodiment of the present application is about 0.2 mm.

[0090] In the present application, the substrate layer 32a with a surface shape matched with the uneven surface of the microstructure 32b can be used to support and protect the microstructure 32b. In addition, since the substrate layer 32a and the microstructure 32b are directly bonded with the display unit 10 and the metal mesh touch unit 50, in order to avoid relative displacement of the substrate layer 32a and the microstructure 32b caused by assembly stress, the substrate layer 32a and the microstructure 32b need to have good adhesion.

[0091] Preferably, in the second embodiment of the present application, the refractive index of the microstructure 32b can be set to 1.5 to 1.7 (for example, 1.53 at a wavelength of 532 nm), and the refractive index of the substrate layer 32a in contact with the microstructure 32b can be set to 1.4 to 1.6 (for example, 1.47 at a wavelength of 532 nm), and the refractive index of the substrate layer 32a in contact with the microstructure 32b can be set to be less than the refractive index of the microstructure 32b.

[0092] In the case of having an uneven interface between the substrate layer and the microstructure, the uneven surface can be formed on the substrate layer by techniques such as laser engraving, etching, coating, printing, etc., and then the material of the microstructure is applied on the substrate layer to fill the gaps on the uneven surface while forming the microstructure.

[0093] As Figure 5As shown, the metal mesh touch display device 3 of the third embodiment of the present application is different from the first embodiment in that the microstructure layer 33 comprises: a lower adhesive layer 33a disposed on the display unit 10; a substrate layer 33b disposed on the upper surface of the lower adhesive layer 33a and having a flat shape; a microstructure 33c disposed on the upper surface of the substrate layer 33b and composed of a plurality of protrusions, the distance between adjacent protrusions being about 25.7 μm, the height of the protrusions being about 6.2 μm, and thus the ratio of the depth to the width (or the ratio of the height to the width) of the microstructure 32b being about 0.24-0.3; and an upper adhesive layer 33d disposed between the microstructure 33c and the upper surface of the substrate layer 33b and the metal mesh touch unit 50, and the lower surface of the upper adhesive layer 33d having a shape matching the upper surface of the microstructure 33c and the substrate layer 33b. The third embodiment of the present application is different from the first embodiment only in the microstructure layer 33, and the rest can refer to the foregoing content.

[0094] In the third embodiment of the present application, the thickness of the lower adhesive layer 33a and the upper adhesive layer 33d can be 50±5 μm, for example, 45, 50 or 55 μm; and the thickness of the substrate layer 33b can be 90±10 μm, for example, 80, 85, 90, 95 or 100 μm. The size of the protrusions is about 10 μm to about 50 μm, and the ratio of the depth to the width (or the ratio of the height to the width) of the microstructure 33c is about 0.1-0.5 or about 0.2-0.4.

[0095] In the third embodiment of the present application, the substrate layer 33b can be a cross-linkable resin layer, for example, a thermosetting resin or an ultraviolet curing resin, and is formed of, for example, a methacrylic resin, an epoxy resin or a polysiloxane-based resin. The microstructure 33c can be formed on the substrate layer 33b by engraving, stamping, transferring or printing, etc.; and the microstructure 33c can be a recess, a protrusion or a combination thereof.

[0096] In some embodiments of the present application, the substrate layer can have a shape corresponding to the microstructure to fill the uneven part of the microstructure; or in other embodiments, the substrate layer can have a flat shape, and the microstructure layer can be disposed on part or all of the upper surface of the flat substrate layer, and then other layers (for example, an adhesive layer or another substrate layer) are used to fill the uneven part of the microstructure; so that the microstructure layer can be smoothly attached to other layers.

[0097] Preferably, in the third embodiment of the present application, in order to further adjust the scattering effect, the refractive index of the microstructure 33c can be set to 1.5-1.7, and the refractive index of the upper adhesive layer 33d in contact with the microstructure 33c can be set to 1.4-1.6, and the refractive index of the upper adhesive layer 33d in contact with the microstructure 33c can be set to be less than the refractive index of the microstructure 33c.

[0098] In particular, referring to Figure 6 and Figure 7 , the metal mesh touch unit 50 of the present application can comprise metal meshes 50a and 50c respectively oriented along two directions (preferably perpendicular to each other), and a base layer 50b therebetween.

[0099] Referring to Figure 6 , the fourth embodiment of the present application is different from the first embodiment in that the metal mesh touch unit 50, and the rest can refer to the foregoing.

[0100] The microstructure layer 30 can be any microstructure layer of the present application as described above, such as the microstructure layers 31, 32 or 33.

[0101] The metal mesh touch unit 50 comprises a first metal mesh 50a oriented along a first direction (e.g. X direction), a second metal mesh 50c oriented along a second direction (e.g. Y direction), and a base layer 50b therebetween. The base layer 50b can serve as a substrate, and the first and second metal meshes 50a and 50c can be directly formed on opposite surfaces (e.g. upper and lower surfaces) of the base layer 50b by printing, coating or other means. In other embodiments, the base layer 50b can be adhesive, and the first and second metal meshes 50a and 50c can be first made on a release film, attached to the opposite surfaces (e.g. upper and lower surfaces) of the base layer 50b by transfer process, and finally the release film is removed.

[0102] The display unit 10 and the metal mesh touch unit 50 according to the fourth embodiment of the present application can have the same configuration as the display unit 10 and the metal mesh touch unit 50 of any of the foregoing embodiments, and thus will not be described again.

[0103] In addition, as in any of the foregoing embodiments, in the fourth embodiment of the present application, the distance between the surface of the display unit 10, in particular the surface facing the metal mesh touch unit 50, and the metal mesh touch unit 50 is greater than 0.2 mm; and the microstructure layer 30 can have any of the surface morphologies as described above, and thus will not be described again.

[0104] In the fourth embodiment of the present application, the thickness of the first adhesive layer 20 can be 0.2 mm ± 0.05 μm, such as 0.15, 0.2, 0.25 mm; the thickness of the microstructure layer 30 can be 0.05 ± 0.01 mm, such as 0.04, 0.05 or 0.06 mm; the thickness of the second adhesive layer 40 can be 0.05 ± 0.01 mm, such as 0.04, 0.05 or 0.06 mm; and the base layer 50b of the metal mesh touch unit 50 can be a PET film with a thickness of 0.03-0.04 mm, such as 0.038 mm.

[0105] Similarly, in the present application, in order to maintain the light transmittance of the display device, the layer of the outer side (the side facing the user) of the display unit 10 is preferably made of a transparent material, in addition to the metal grid (the first metal grid 50a and the second metal grid 50c).

[0106] Therefore, similar to the microstructure and the adhesive layer, the base layer 50b of the metal grid touch unit 50 can also be made of a transparent plastic (such as PET) as described above, but is not limited thereto.

[0107] According to Figure 6 In the fourth embodiment shown, the outer surfaces of the microstructure layer 30 are respectively provided with the first adhesive layer 20 and the second adhesive layer 40, however, in the case where the outer surfaces of the uppermost layer and / or the lowermost layer of the microstructure layer 30 have adhesive properties, the first adhesive layer 20 and / or the second adhesive layer 40 can also be omitted.

[0108] Referring to Figure 7 The metal grid touch display device 5 according to the fifth embodiment of the present application differs from the fourth embodiment in that, in the case where the outer surface of the uppermost layer of the microstructure layer 30 facing the metal grid touch unit 50 has adhesive properties, the second adhesive layer 40 is omitted.

[0109] In addition, although not shown in the figure, in the case where the outer surface of the lowermost layer of the microstructure layer 30 facing the display unit 10 has adhesive properties, the first adhesive layer 20 can also be omitted.

[0110] In order to verify the gray grid improvement effect of the metal grid touch display device of the present application, by using metal grids with different line widths, the gray grid levels of the metal grid touch display devices according to the present application (embodiments) and the prior art (comparative examples) are compared by visual observation, and the results are shown in Table 1 below.

[0111] Among them, the metal grid touch display device of the present application is provided with a microstructure layer (thickness greater than 0.2 mm) as described above between the display unit and the metal grid touch unit; while the metal grid touch display device of the prior art is only provided with a flat optical transparent adhesive layer OCA (thickness of 0.2 mm) without microstructure between the display unit and the metal grid touch unit. The above-mentioned thickness is the distance between the upper surface of the display unit and the lower surface of the metal grid touch unit.

[0112] Table 1

[0113]

[0114] From the test results of the first embodiment of the present application listed in Table 1, under the condition of various metal mesh line widths, compared with the comparative example (only set the thickness of the adhesive layer equal to 0.2 mm between the display unit and the metal mesh touch unit), the metal mesh touch display device according to the present application further sets the thickness of the astigmatism microstructure equal to 0.2 mm between the display unit and the metal mesh touch unit, wherein, due to the uneven surface of the microstructure providing the astigmatism effect, which is equivalent to the effect of enlarging the area of the pixel, the light emission of the sub-pixel is not easily blocked by the metal line, while reducing the brightness difference between the shadow area and the non-shadow area; and, due to the distance between the surface of the display unit and the metal mesh touch unit being moderately pulled apart to be greater than 0.2 mm, the shielding effect of the metal mesh can be reduced, thereby reducing the shadow area, and also reducing the size of the shadow formed by the metal mesh touch unit; therefore, the metal mesh touch display device of the present application has obvious technical effects of improving the gray grid phenomenon compared with the prior art. It is worth noting that, according to the experimental results of Table 1, the synergistic mechanism adopted by the present application can alleviate the gray grid problem under the condition of a metal line width of 4.5 μm / nod area of 100 μm 2 Therefore, when a product with a larger line width or a larger nod area is used, it is speculated that the present application can also produce the effect of alleviating the gray grid problem, that is, the present application believes that under the condition of a metal line width of 5 μm / nod area of 200 μm 2 , the mechanism of the present application can also solve the gray grid problem. Conversely, when a metal mesh with a smaller line width or a smaller nod area (such as a line width of 2.5 μm / nod area of 80 μm 2 ) is used, the gray grid problem will be reduced in the case of area reduction, and the introduction of the structure of the present application can further inhibit the generation of the gray grid.

[0115] In addition, one of the causes of the gray grid problem is the small size of the light-emitting sub-pixel. In the aforementioned first embodiment, the RGB sub-pixels of the display unit 10 are in a Pentile arrangement mode, in which the G sub-pixel has the smallest area (about 840 μm 2 ). Under the condition of a metal line width of 3 μm, the optical properties of G and B sub-pixels are compared, and the gray grid problem of the G sub-pixel is observed. However, after the introduction of the microstructure layer of the present application, the gray grid phenomenon of the G sub-pixel can be improved. In another embodiment, the G sub-pixel of the display unit 10 has the smallest area (about 484 μm 2 ), and the gray grid problem of the G sub-pixel can also be improved. That is, under the aforementioned metal mesh size specifications, the minimum area of the sub-pixel of the display unit 10 is between 400-900 μm 2 , which can be improved by the microstructure layer of the present application to improve the gray grid problem.

Claims

1. A metal mesh touch display device, characterized by, The display unit comprises a plurality of light-emitting pixels, and the light-emitting pixel density of the display unit is greater than 150 ppi. Metal mesh touch unit, whose grid line width is greater than 2.5 pm and / or grid node area is greater than 80 pm 2 ; The microstructure layer is interposed between the display unit and the metal mesh touch unit, and comprises a substrate layer and a microstructure. The distance between the surface of the display unit and the metal mesh touch unit is greater than 0.2 mm. At least one surface of the microstructure has a plurality of convex portions, a plurality of concave portions, or a combination thereof. The light-emitting pixel density of the display unit is between 150 ppi and 400 ppi.

2. The metal mesh touch display device of claim 1, wherein, The microstructure layer further comprises an upper adhesive layer and a lower adhesive layer.

3. The metal mesh touch display device of claim 1, wherein, the grid line width is greater than 3.5 pm and / or the grid node area is greater than 100 pm 2 .

4. The metal mesh touch display apparatus of claim 1, wherein, The upper adhesive layer is arranged below the metal mesh touch unit.

5. The metal mesh touch display apparatus of claim 1, wherein, The substrate layer is arranged on the lower surface of the upper adhesive layer and has a flat shape. The microstructure is arranged on the lower surface of the substrate layer, and the lower surface of the microstructure has a plurality of convex portions, a plurality of concave portions, or a combination thereof. The lower adhesive layer is arranged between the lower surface of the microstructure and the display unit, and the upper surface of the lower adhesive layer has a shape matching the lower surface of the microstructure. The microstructure is arranged on the lower surface of the substrate layer. The upper surface of the microstructure has a plurality of convex portions, a plurality of concave portions, or a combination thereof.

6. The metal mesh touch display apparatus of claim 1, wherein, The lower surface of the substrate layer has a shape matching the upper surface of the microstructure. The microstructure layer further comprises a lower adhesive layer and an upper adhesive layer. The lower adhesive layer is arranged on the display unit.

7. The metal mesh touch display apparatus of claim 1, wherein, The substrate layer is arranged on the upper surface of the lower adhesive layer and has a flat shape. The microstructure is arranged on the upper surface of the substrate layer and comprises a plurality of convex portions. The upper adhesive layer is arranged between the upper surface of the microstructure and the metal mesh touch unit, and the lower surface of the upper adhesive layer has a shape matching the upper surface of the microstructure and the substrate layer. The metal mesh touch unit comprises: a first metal mesh oriented in a first direction; 8. The metal mesh touch display apparatus of claim 1, wherein, a second metal mesh oriented in a second direction; and a base layer interposed between the first metal mesh and the second metal mesh. The display unit comprises a plurality of light-emitting pixels, and the light-emitting pixel density of the display unit is greater than 150 ppi. The microstructure layer is interposed between the display unit and the metal mesh touch unit, and comprises a substrate layer and a microstructure.

9. A metal mesh touch display device, characterized by, The distance between the surface of the display unit and the metal mesh touch unit is greater than 0.2 mm. Metal mesh touch unit, whose grid line width is greater than 2.5 μm and / or grid node area is greater than 80 μm 2 ; a display unit comprising a plurality of light emitting pixels, the smallest light emitting pixel in the display unit having an area of between 400 and 900 μm 2 ; The microstructure is a diffractive structure comprising a plurality of convex portions, a plurality of concave portions, or a combination thereof. ​ ​ 10. The metal mesh touch display device of claim 9, wherein, ​

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