Capacitive touch display device

Abstract

The invention belongs to the technical field of display devices, and particularly relates to a capacitive touch display device which comprises a capacitive touch sensor layer. A liquid crystal cell; a glass layer; a first moth-eye mask is arranged on the upper surface of the glass layer, a second moth-eye mask is arranged on the lower surface of the glass layer, and an anti-dazzle film is arranged above the first moth-eye mask; a third moth eye mask is arranged on the upper surface of the liquid crystal unit; the moth eye mask comprises a substrate and a convex part array which is connected with the substrate and consists of a plurality of convex parts; each convex part comprises a convex part top and a circular truncated cone body; the top of the convex part is a hemisphere or a semiellipsoid; the top surface of the circular truncated cone coincides with the bottom surface of the top of the convex part, and the diameter of the circular truncated cone is gradually increased downwards from the top surface; a pit is formed between every two adjacent convex parts; the concave pit is connected with the circular truncated cone of the convex part, and the joint is in smooth transition; the bottom of the pit is located above the substrate. According to the design, the service life can be prolonged, the operation stability can be improved, and the display effect under the wide viewing angle is improved.

Description

Technical Field

[0001] This application belongs to the field of display device technology, and specifically relates to a capacitive touch display device. Background Technology

[0002] As a core technology of modern human-computer interaction, capacitive touch displays are playing an increasingly important role in the display device field. A capacitive touch display typically consists of a display module and a capacitive touch sensing module. This structure allows the touch location to be detected by changing the capacitance between conductive layers when a user's finger touches the screen, enabling precise and smooth touch operations. Capacitive touch technology, with its low power consumption, long lifespan, and excellent multi-touch capabilities, has been widely used in portable devices such as smartphones and tablets.

[0003] However, with the continuous development of technology and the diversification of market demands, capacitive touch display devices also face some pressing technical challenges. Currently, the bonding between display modules and capacitive touch sensing modules uses various methods such as frame bonding, zero bonding, and full bonding. Full bonding is less common, mainly because it uses water-based adhesives for curing, resulting in a longer process timeline, especially for large or ultra-large display devices, making rapid delivery impossible. In frame bonding and zero bonding solutions, the display module and capacitive touch sensing module are spaced apart, with an air gap in between. Multiple light reflections from the glass layer and the air gap layer reduce the overall transmittance of the display device, affecting display quality. The wide viewing angle is particularly critical. The screen's color and brightness may change when viewed from different angles, impacting user experience. Furthermore, capacitive touch display devices are prone to touch malfunctions when operating in high-temperature and / or high-humidity environments. Therefore, these issues need to be addressed to improve the performance and user experience of capacitive touch display devices. Summary of the Invention

[0004] In view of this, this application provides a capacitive touch display device. By setting multiple layers of moth-eye film and designing its microstructure, the service life and operational stability of the capacitive touch display device under frame-mount or zero-mount schemes can be improved, while also improving the display effect under wide viewing angles, thereby solving the above problems.

[0005] Specifically, the capacitive touch display device provided in this application includes: a capacitive touch sensor layer; a liquid crystal unit located below the capacitive touch sensor layer; a glass layer located above the capacitive touch sensor layer; a first eye film disposed on the upper surface of the glass layer, a second eye film disposed on the lower surface, and an anti-glare film disposed above the first eye film; the liquid crystal unit and the capacitive touch sensor are spaced apart; a third eye film is disposed on the upper surface of the liquid crystal unit; the first eye film, the second eye film, and the third eye film include a base and a protrusion array composed of multiple protrusions connected to the base; a single protrusion includes a top and a frustum; the top of the protrusion is a hemisphere or a semi-ellipsoid; the top surface of the frustum coincides with the bottom surface of the top of the protrusion, and the diameter of the frustum gradually increases from the top surface downwards; a pit is formed between adjacent protrusions; the pit connects to the frustum of the protrusion, and the connection is smooth; the bottom of the pit is located above the base.

[0006] During their research, the inventors of this application discovered that under high temperature and humidity conditions, water vapor can penetrate into the device, and the hydroxyl groups in water molecules can combine with sodium ions in the glass layer to form an alkaline environment. This alkaline environment can corrode the material of the capacitive touch sensor layer, thus causing touch malfunctions. This application provides a first and a second "moth-eye" film on the upper and lower surfaces of the glass layer. By controlling the structure of the "moth-eye" film, including the base and the array of protrusions, the "moth-eye" film acts as a barrier between the external environment, the glass layer, and the capacitive touch sensor layer, reducing or preventing the free movement and contact of water molecules and sodium ions in the glass layer. This reduces the formation of an alkaline environment and the corrosion of the capacitive touch sensor layer, lowers the probability of touch malfunctions, and improves the operational stability and lifespan of the capacitive touch display device. Furthermore, the inventors unexpectedly discovered that by providing a third "moth-eye" film on the upper surface of the liquid crystal unit, and using the three-layer "moth-eye" film designed in this application in conjunction with the anti-glare film, it can interact with the air gap and the refraction and reflection of the capacitive touch sensor layer, improving the anti-reflection, anti-reflection, and wide viewing angle effects of the capacitive touch display device. By adjusting the microstructure of the moth-eye film, the hemispherical or semi-ellipsoidal convex top design can more effectively scatter light. A frustum below the top provides a gradual transition, further reducing the reflectivity of incident light from above at the interface. The frustum and recess are directly connected and smoothly transitioned, eliminating minor defects and unevenness at the interface, resulting in more uniform and softer reflected light. The synergistic effect of the convex and recess allows light to undergo multiple reflections and refractions within the moth-eye film and anti-glare film, increasing the propagation path of light emitted from the lower LCD panel and improving light transmittance. Furthermore, by enhancing scattering and reducing direct reflection, the loss of light emitted from the LCD panel at large angles can be reduced, thereby increasing the brightness and contrast of capacitive touch displays at wide viewing angles. This helps to clearly display key information in complex environments, improving user experience and expanding application scenarios.

[0007] In this application, "upper" and "upper surface" refer to the direction in which the glass layer is positioned relative to the capacitive touch sensor layer. For example, "upper surface of the glass layer" refers to the surface of the glass layer away from the capacitive touch sensor layer. "Lower" and "lower surface" refer to the direction in which the liquid crystal cell is positioned relative to the capacitive touch sensor layer, which is the opposite direction of "upper" and "upper surface". For example, "lower surface of the glass layer" refers to the surface of the glass layer closer to the capacitive touch sensor layer.

[0008] In some embodiments, the first, second, and third moth-eye membranes independently satisfy the following conditions: the bottom diameter of the protrusion is A nm, the distance between adjacent protrusions is B nm, and 1.6 ≤ B / A ≤ 6.5. For example, the value of B / A can be 1.6, 2.0, 2.3, 3.1, 3.4, 3.8, 4.6, 5.2, 5.8, 6.3, 6.5, or any combination thereof. When the bottom diameter of the protrusion and the distance between adjacent protrusions are adjusted to satisfy the above relationship, the protrusions and recesses can better cooperate to reflect and refract light, allowing some reflected light to cancel each other out through phase difference, further improving the anti-reflection effect of the capacitive touch display device, further increasing the transmittance of emitted light, and achieving higher brightness over a wide viewing angle.

[0009] In this application, the bottom of the protrusion is calculated based on the bottom of a frustum, and the bottom diameter of the protrusion is also the maximum diameter of the frustum. The bottom diameter of the protrusion can be measured using methods known in the art, such as taking an SEM image of the moth eye membrane from directly above, then selecting a protrusion from the SEM image and measuring its frustum bottom diameter as the bottom diameter of a single protrusion. The distance between adjacent protrusions is calculated based on the minimum distance between two adjacent protrusions. The bottom diameters of the protrusions in the moth eye membrane and the distances between adjacent protrusions are averaged. For example, a test area can be randomly selected from the moth eye membrane, and the bottom diameters of each protrusion in the test area and the distances between adjacent protrusions in the test area can be measured, then the arithmetic mean can be calculated.

[0010] In some embodiments, the first moth eye membrane, the second moth eye membrane, and the third moth eye membrane each independently satisfy at least one of the following conditions:

[0011] Condition 1: 100 ≤ A ≤ 150; and / or, 500 ≤ B ≤ 650. For example, A can be a value within the range of 100, 106, 117, 120, 123, 131, 138, 144, 150, or any two of these; B can be a value within the range of 500, 522, 535, 556, 575, 583, 603, 618, 639, 650, or any two of these. When the bottom diameter Anm of the adjustable protrusion and / or the distance Bnm between adjacent protrusions satisfy the above ranges, the interaction between the protrusion and the recess can be further improved, enhancing the anti-reflection, increased transmittance, and wide viewing angle display effects of the capacitive touch display device.

[0012] Condition 2: The distance between the protrusion and the adjacent pit in the direction perpendicular to the substrate is 850nm to 1000nm, for example, it can be a value within the range of 850nm, 860nm, 880nm, 890nm, 910nm, 930nm, 940nm, 950nm, 980nm, 1000nm, or any two of these. In this application, the maximum distance between the protrusion and the adjacent pit in the direction perpendicular to the substrate is measured by the highest point of the top of the single protrusion and the lowest point of the bottom of the adjacent pit. For example, a cross section is taken along the line connecting the highest point of the top of the single protrusion and the lowest point of the bottom of the adjacent pit in the direction perpendicular to the substrate, and then the distance between the apex of the protrusion and the lowest point of the bottom of the adjacent pit in the direction perpendicular to the substrate is measured by SEM.

[0013] Condition 3: The number of protrusions per unit area is 1 to 5 per μm. 2 For example, randomly select an area of ​​1µm from the moth's eye membrane. 2 The area to be measured contains convex parts, which can be 1, 2, 3, 4, 5, or any combination thereof. When a portion of the area of ​​a convex part falls within the area to be measured, the number of convex parts is rounded up.

[0014] Condition 4: The area of ​​the pit projected onto the substrate is 80% to 95%, for example, it can be 80%, 81%, 83%, 84%, 86%, 88%, 90%, 91%, 92%, 93%, 95% or any two of these values.

[0015] In this application, the moth-eye membrane with the aforementioned dimensions can be produced using a method comprising the following steps: mixing inorganic nanoparticles and resin materials, coating the mixture onto a glass layer or liquid crystal cell, and then performing gravure printing to obtain the moth-eye membrane. The structural features of the moth-eye membrane regarding protrusions and depressions can be controlled using gravure templates of different specifications to obtain a moth-eye membrane with the target structure and dimensions.

[0016] In some embodiments, the first moth eye membrane, the second moth eye membrane, and the third moth eye membrane each independently satisfy at least one of the following conditions:

[0017] Condition 1: 20 ≤ A ≤ 50; and / or, 80 ≤ B ≤ 100. For example, A can be a value within the range of 20, 23, 26, 29, 33, 35, 38, 42, 46, 48, 50, or any two of these; B can be a value within the range of 80, 83, 87, 88, 91, 92, 94, 98, 99, 100, or any two of these. When the bottom diameter A nm of the adjustable protrusion and / or the distance B nm between adjacent protrusions meets the above-mentioned relatively small size range, the cooperation between the protrusion and the recess can be further improved, enhancing the anti-reflection, anti-reflection, and wide-viewing-angle display effects of the capacitive touch display device.

[0018] Condition 2: The maximum distance between the protrusion and the adjacent pit in the direction perpendicular to the substrate is 650nm to 1000nm, for example, it can be a value within the range of 650nm, 690nm, 750nm, 790nm, 820nm, 860nm, 900nm, 960nm, 990nm, 1000nm or any two of them.

[0019] Condition 3: The number of protrusions per unit area of ​​the moth's eye membrane is 72–150 / µm. 2 For example, in a region of 1 μm², the number of protrusions in a moth eye membrane can be 72, 82, 91, 100, 107, 124, 129, 133, 144, 150, or any combination thereof.

[0020] When the structural features of the convex and concave portions of the moth eye membrane are adjusted to meet the above-mentioned ranges, the anti-reflective effect of the moth eye structure can be promoted. When closely matched with the structure of the anti-glare film, it can further improve the anti-reflective and anti-reflective effects of the capacitive touch display device, and also help to improve the brightness under wide viewing angle.

[0021] In this application, the moth-eye film with the aforementioned dimensions can be produced using a method comprising the following steps: plasma treatment of the glass layer or liquid crystal cell, followed by a coating process to obtain a thin film containing inorganic nanoparticles; then, sequentially depositing a silicon metal layer and a niobium aluminum layer on the aforementioned thin film; and finally, etching to obtain the moth-eye film. The etching process can be performed using an acidic etching paste. This method yields a moth-eye film with relatively small bottom diameters of the protrusions and relatively small distances between adjacent protrusions, allowing for more precise adjustment of the reflection or refraction effects of incident light from the external environment and emitted light from the liquid crystal panel, thereby improving the aforementioned display effect.

[0022] In some embodiments, the first moth eye membrane, the second moth eye membrane, and the third moth eye membrane each independently satisfy the following: the thickness of the substrate is 100 nm to 50 μm, preferably, the thickness of the substrate is 210 nm to 970 nm.

[0023] In some embodiments, the first moth eye membrane, the second moth eye membrane, and the third moth eye membrane each independently satisfy the following: both the substrate and the protrusions comprise inorganic nanoparticles; the material of the inorganic nanoparticles is selected from at least one of zirconium oxide, silicon dioxide, or titanium oxide; and / or, the substrate and the protrusions also comprise a resin material; the resin material comprises at least one of acrylic resin, polyurethane resin, or polyester resin.

[0024] In some embodiments, the mass percentage of inorganic nanoparticles in the moth eye membrane is 1% to 15% based on the mass of the membrane; exemplarily, the mass percentage of inorganic nanoparticles in the moth eye membrane is a value within the range of 1%, 2%, 4%, 5%, 7%, 8%, 10%, 11%, 12%, 14%, 15%, or any combination thereof. When the mass percentage of inorganic nanoparticles in the moth eye membrane is controlled to meet the above range, it helps to balance improving the rigidity and optical performance of the moth eye membrane, thereby enhancing the stability and durability of the capacitive touch display device.

[0025] In some embodiments, the particle size of the inorganic nanoparticles satisfies: D100≤1μm, D90≤500nm, D50≤200nm.

[0026] In some embodiments, the haze value of the anti-glare film is 21% to 29%; adjusting the haze value of the anti-glare film within this range allows for better compatibility with the multilayer moth-eye film of this application, improving the transmittance of the display device, reducing reflectivity, and optimizing the display effect over wide viewing angles. In some more preferred embodiments, the haze value of the anti-glare film is 23% to 26%, for example, 25%.

[0027] In this application, haze value refers to the percentage of transmitted light intensity at an angle greater than 2.5° from the incident light to the total transmitted light intensity. It is formed by the reflection of light by fine particles inside the anti-glare film and is related to the purity of the anti-glare film material. This application does not impose any special limitations on the method for controlling haze value; methods known in the art can be used, as long as they achieve the purpose of this application. For example, different materials or anti-glare films with different purity levels can be selected.

[0028] In some embodiments, the upper surface of the anti-glare film is also provided with an anti-fingerprint film, which can further protect the anti-glare film and the display device.

[0029] In some embodiments, a first OCA optical adhesive layer is disposed between the capacitive touch sensor layer and the glass layer; a second eye film is adhered to the upper surface of the first OCA optical adhesive layer, and the capacitive touch sensor layer is adhered to the lower surface of the first OCA optical adhesive layer. The molecular structure of OCA optical adhesive exhibits a network structure, which enables a tight bond between the capacitive touch sensor layer and the glass layer, improving their adhesion. However, the pores in the network structure allow large-volume ions to pass through, posing a risk of corrosion to the capacitive touch sensor. In this application, the combination of the first OCA optical adhesive and the second eye film structure on the lower surface of the glass layer overcomes these shortcomings, improving the operational stability and lifespan of the capacitive touch display device.

[0030] In some embodiments, the capacitive touch sensor layer includes a first sensor layer and a second sensor layer; the first sensor layer and the second sensor layer satisfy at least one of the following conditions:

[0031] Condition 1: The first sensor layer and the second sensor layer are each independently selected from at least one of indium tin oxide (ITO), a silver nanoparticle layer, or a metal mesh layer. Indium tin oxide (ITO) can generate chemical internal stress after being etched in an alkaline environment, potentially leading to ITO-Crack; silver nanoparticles (SNW) can experience silver migration in moisture and / or alkaline environments; and metal mesh (MM) is prone to touch malfunctions under high temperature and high humidity conditions. The capacitive touch display device design of this application can reduce or avoid the above-mentioned problems, reduce touch malfunctions, and improve the operational stability and lifespan of the display device.

[0032] Condition 2: The first sensor layer and the second sensor layer are bonded to each other, or a second OCA optical adhesive layer is provided between the first sensor layer and the second sensor layer, with the upper surface of the second OCA optical adhesive layer bonded to the first sensor layer and the lower surface of the second OCA optical adhesive layer bonded to the second sensor layer.

[0033] The capacitive touch display device based on this application has at least the following advantages:

[0034] A first moth-eye membrane is disposed on the upper surface of the glass layer. The structure of the moth-eye membrane, including a base and an array of protrusions, is adjusted to act as a barrier between the glass layer and the external environment. When the capacitive touch display device of this application is used in special environments with high temperature and / or high humidity, the barrier effect of the moth-eye membrane can reduce the entry of water molecules from the external environment into the glass layer, reduce the free release, contact, and binding of water molecules and highly reactive sodium ions in the glass layer, thereby reducing or avoiding the formation of an alkaline environment.

[0035] OCA optical adhesive is generally used to connect the glass layer and the capacitive touch sensor layer. However, its intramolecular network structure does not impede the passage of sodium ions and hydroxyl groups, making the capacitive touch sensor layer susceptible to erosion. In particular, when the capacitive touch sensor layer uses an indium tin oxide (ITO) layer and / or a silver nanoparticle (SNW) layer, it can lead to ITO layer cracking and silver migration, affecting the sensitivity and accuracy of capacitive touch response. This application provides a second "eye film" on the lower surface of the glass layer, which can block the erosion of the capacitive touch sensor layer by sodium ions and water molecules, reducing ITO layer cracking and silver migration problems. This helps to reduce touch malfunctions, improve touch stability during display device operation, and give the capacitive touch display device excellent durability and lifespan.

[0036] During their research, the inventors unexpectedly discovered that placing a third "moth's eye" film on the upper surface of the liquid crystal cell and an anti-glare film on the first "moth's eye" film could work in conjunction with the first and second "moth's eye" films. By designing the microstructure of the three-layer "moth's eye" film and employing the tight fit of the convex and concave structures on the film, transmittance can be improved, reflectivity reduced, and the wide viewing angle of the display device enhanced, resulting in higher brightness and contrast when viewed at large angles. This capacitive touch display device can utilize either zero-mount or frame-mount processes for the liquid crystal cell. Even when the liquid crystal cell and the capacitive touch sensor are spaced apart with an air gap, it still achieves excellent anti-reflection, anti-reflection, and wide viewing angle effects, thereby improving the user's viewing and usage experience and meeting the needs of various application scenarios. Using frame-mount or zero-mount processes can also significantly shorten processing time and reduce both time and processing costs.

[0037] It should be noted that in the description of this application, the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Attached Figure Description

[0038] Figure 1 A schematic diagram of a capacitive touch display device provided for a specific embodiment of this application;

[0039] In the figure, 110-glass layer, 120-capacitive touch sensor layer, 130-liquid crystal unit, 101-first moth eye film, 102-second moth eye film, 103-third moth eye film, 104-anti-glare film, 121-first sensor layer, 122-second sensor layer, 140-first OCA optical adhesive layer. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0041] Please refer to Figure 1 The schematic diagram shown illustrates that the capacitive touch display device provided in this application includes: a capacitive touch sensor layer (120); a liquid crystal unit (130) located below the capacitive touch sensor layer (120); a glass layer (110) located above the capacitive touch sensor layer (120); a first eye film (101) is disposed on the upper surface of the glass layer (110), a second eye film (102) is disposed on the lower surface, and an anti-glare film (104) is disposed above the first eye film (101); the liquid crystal unit (130) and the capacitive touch sensor (120) are spaced apart. The upper surface of the liquid crystal unit (130) is provided with a third moth eye membrane (103); the first moth eye membrane (101), the second moth eye membrane (102) and the third moth eye membrane (103) include a substrate and an array of protrusions connected to the substrate; each protrusion includes a top and a frustum; the top of the protrusion is a hemisphere or a semi-ellipsoid; the top surface of the frustum coincides with the bottom surface of the top of the protrusion, and the diameter of the frustum gradually increases from the top surface downwards; a pit is formed between adjacent protrusions; the pit connects to the frustum of the protrusion, and the connection is smooth; the bottom of the pit is located on the substrate.

[0042] In some embodiments, please refer to Figure 1 A schematic diagram of a capacitive touch display device is shown. A first OCA optical adhesive layer (104) is disposed between the capacitive touch sensor layer and the glass layer. A second moth-eye film (102) is attached to the upper surface of the first OCA optical adhesive layer (104), and a capacitive touch sensor layer (120) is attached to the lower surface of the first OCA optical adhesive layer (104).

[0043] In some embodiments, please refer to Figure 1 A schematic diagram of a capacitive touch display device, wherein the capacitive touch sensor layer (120) includes a first sensor layer (121) and a second sensor layer (122). The first sensor layer (121) and the second sensor layer (122) may be independently selected from indium tin oxide (ITO), silver nanoparticles (SNW), or metal mesh (MM).

[0044] In this application, the first sensor layer (121) and the second sensor layer (122) can be bonded to each other, or a second OCA optical adhesive layer is provided between the first sensor layer (121) and the second sensor layer (122), with the upper surface of the second OCA optical adhesive layer bonded to the first sensor layer (121) and the lower surface of the second OCA optical adhesive layer bonded to the second sensor layer (122).

[0045] Please refer to this application. Figure 1 A schematic diagram of a capacitive touch display device is provided. When the liquid crystal unit (130) and the capacitive touch sensor (120) are connected using a zero-mount or frame-mount method, the liquid crystal unit (130) and the capacitive touch sensor (120) are spaced apart, with an air gap between them. The capacitive touch display device of this application uses frame-mount and zero-mount processes, which can shorten the process time and reduce time and process costs. Furthermore, through the close cooperation of multiple layers of anti-glare film and anti-reflective film, even with the air gap layer included, it can also improve transmittance, reduce reflectivity, and improve the wide viewing angle, which is beneficial to improving the user experience.

[0046] The solution of this application will be described below with reference to the following specific embodiments. Unless otherwise specified, the raw materials used in the following embodiments are all from commercially available products, and the devices or equipment used are all purchased from conventional market sales channels.

[0047] Example 1

[0048] The capacitive touch display device of this embodiment includes: a capacitive touch sensor layer; a liquid crystal unit located below the capacitive touch sensor layer; a glass layer located above the capacitive touch sensor layer; a first moth-eye film is disposed on the upper surface of the glass layer, a second moth-eye film is disposed on the lower surface, and an anti-glare film is disposed above the first moth-eye film; the liquid crystal unit and the capacitive touch sensor are disposed at intervals; a third moth-eye film is disposed on the upper surface of the liquid crystal unit; the first moth-eye film, the second moth-eye film, and the third moth-eye film include a base and a protrusion array composed of multiple protrusions connected to the base; a single protrusion includes a top and a frustum; the top of the protrusion is a hemisphere or a semi-ellipsoid; the top surface of the frustum coincides with the bottom surface of the top of the protrusion, and the diameter of the frustum gradually increases from the top surface downwards; a pit is formed between adjacent protrusions; the pit connects to the frustum of the protrusion, and the connection is smooth; the bottom of the pit is located above the base. The structural parameters of the first moth-eye film, the second moth-eye film, and the third moth-eye film in Embodiment 1 are set according to Table 1.

[0049] In Example 1, the thickness of the substrate is 150 nm. Both the substrate and the protrusions include inorganic nanoparticles and resin materials. The first, second, and third moth eye membranes are made of the same material, all of which are acrylic resins. The inorganic nanoparticles are all made of silicon dioxide. Based on the mass of the moth eye membrane, the mass ratio of inorganic nanoparticles is 11%. The particle size of the inorganic nanoparticles meets the following requirements: D100≤1μm, D90≤500nm, and D50≤200nm.

[0050] In this embodiment, a first OCA optical adhesive layer is disposed between the capacitive touch sensor layer and the glass layer; a second eye film is attached to the upper surface of the first OCA optical adhesive layer, and the capacitive touch sensor layer is attached to the lower surface of the first OCA optical adhesive layer, wherein the capacitive touch sensor layer is an indium tin oxide layer. The haze value of the anti-glare film is 25%, and an anti-fingerprint film is also disposed on the upper surface of the anti-glare film.

[0051] The capacitive touch display devices in the following embodiments differ from Embodiment 1 only in that the structural parameters of the first moth eye membrane, the second moth eye membrane, and the third moth eye membrane are set according to Table 1.

[0052] Table 1

[0053]

[0054]

[0055] Comparative Example

[0056] The capacitive touch display device of Comparative Example 1 differs from that of Example 1 only in that the first moth eye membrane is omitted.

[0057] The capacitive touch display device of Comparative Example 2 differs from that of Example 1 only in that the second moth eye membrane is omitted.

[0058] The capacitive touch display device of Comparative Example 3 differs from Example 1 only in that the third moth eye membrane is omitted.

[0059] The only difference between the capacitive touch display device of Comparative Example 4 and Example 1 is that the anti-glare film is omitted.

[0060] The capacitive touch display device of Comparative Example 5 differs from that of Example 1 only in that the top of the protrusion in the moth eye membrane is a cone.

[0061] The capacitive touch display device of Comparative Example 6 differs from that of Example 1 only in that: no pits are provided in the moth-eye membrane, the bottom surface of the truncated cone of the convex part is directly connected to the substrate, and each convex part is independent of each other and does not contact each other. The maximum distance between the convex part and the substrate in the direction perpendicular to the substrate is 950 nm.

[0062] Double 85 test:

[0063] Five capacitive touch display devices from Examples 1 and Comparative Examples 1 to 3 were taken from each example and stored under constant temperature and humidity conditions of 85°C and 85% for 504 hours. Then, the line sensitivity of the capacitive touch display devices was tested according to the "DB44 / T 2009-2017 General Technical Specification for Capacitive Touch Screens in Mobile Terminals". Test results meeting the single-layer structure requirements of the aforementioned specification were considered passed and denoted as P. The test results showed that all capacitive touch display devices from Examples 1 and 3 passed the test, denoted as 5P / 5; some capacitive touch display devices from Comparative Examples 1 and 2 failed the test, with results of 1P / 5 and 3P / 5 respectively. It can be seen that this application provides a first and a second "moth's eye" membrane on the upper and lower surfaces of the glass layer. By controlling the structure of the "moth's eye" membrane, including the base and the array of protrusions, the "moth's eye" membrane acts as a barrier between the external environment, the glass layer, and the capacitive touch sensor layer, reducing the probability of touch malfunctions and improving the operational stability and service life of the capacitive touch display device.

[0064] The transmittance, reflectance, brightness, and contrast at wide viewing angles of the capacitive touch display devices of each embodiment and comparative example were tested, and the results are shown in Table 2 below.

[0065] Transmittance and reflectance were tested using a universal integrating sphere testing system. Brightness and contrast tests at wide viewing angles included measuring the brightness of bright white and the contrast between bright white and pure black at a distance of 25cm from the display device at an angle of 50° to the normal to the display device (i.e., a line perpendicular to the surface of the display device from its center). Table 1 uses the brightness and contrast obtained from Comparative Example 3 as a baseline (denoted as 1) to statistically analyze the ratios of brightness and contrast between each embodiment and the comparative example compared to Comparative Example 3.

[0066] Table 2

[0067] serial number Transmittance / % Reflectivity / % Wide viewing angle brightness Wide viewing angle contrast Example 1 97.9 1.0 1.7 1.6 Example 2 96.6 1.5 1.6 1.5 Example 3 98.9 0.5 1.8 1.5 Example 4 95.4 1.8 1.6 1.5 Example 5 94.6 3.0 1.4 1.3 Example 6 93.9 3.3 1.3 1.2 Comparative Example 1 92.0 4.6 1.1 1.1 Comparative Example 2 94.3 3.4 1.3 1.2 Comparative Example 3 91.6 4.9 1.0 1.0 Comparative Example 4 93.2 3.9 1.2 1.1 Comparative Example 5 93.5 4.0 1.1 1.1 Comparative Example 6 91.9 4.3 1.1 1.1

[0068] As shown in Table 2, this application, by regulating the microstructure of the first, second, and third moth eye membranes, can reduce the reflectivity of incident light and increase the transmittance of light emitted by the liquid crystal panel when combined with the anti-glare film. This also helps to improve the brightness and contrast of the capacitive touch display device when viewed at a large angle.

[0069] Specifically, when the structural parameters of the first, second, and third moth eye membranes in this application are adjusted to satisfy 100≤A≤150, 500≤B≤650, or 20≤A≤50, 80≤B≤100, respectively, the transmittance effect can be further improved and the reflection effect reduced. Furthermore, this also helps to enhance the display effect of the display device at wide viewing angles. In particular, when the structural parameters of the first, second, and third moth eye membranes in this application are adjusted to satisfy the relationship 1.6≤B / A≤6.5, the reflectivity can be further reduced, and the transmittance and wide viewing angle effect of the display device can be improved.

[0070] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the principles of this application should be included within the protection scope of this application.

Claims

1. A capacitive touch display device, characterized in that, include: Capacitive touch sensor layer; The liquid crystal unit is located below the capacitive touch sensor layer; A glass layer is located above the capacitive touch sensor layer; A first moth-eye membrane is provided on the upper surface of the glass layer, a second moth-eye membrane is provided on the lower surface, and an anti-glare membrane is provided above the first moth-eye membrane. The liquid crystal unit and the capacitive touch sensor are spaced apart; a third moth-eye membrane is provided on the upper surface of the liquid crystal unit; The first moth eye membrane, the second moth eye membrane, and the third moth eye membrane each include a base and an array of protrusions connected to the base. Each protrusion includes a top and a frustum. The top of the protrusion is a hemisphere or a semi-ellipsoid. The top surface of the frustum coincides with the bottom surface of the top of the protrusion, and the diameter of the frustum gradually increases from the top surface downwards. A recess is formed between adjacent protrusions; the recess connects to the frustum of the protrusion, and the connection is smooth; the bottom of the recess is located on the base.

2. The capacitive touch display device according to claim 1, characterized in that, The first moth eye membrane, the second moth eye membrane, and the third moth eye membrane each independently satisfy the following: the bottom diameter of the protrusion is A nm, the distance between adjacent protrusions is B nm; 1.6≤B / A≤6.

5.

3. The capacitive touch display device according to claim 2, characterized in that, The first moth eye membrane, the second moth eye membrane, and the third moth eye membrane each independently satisfy at least one of the following conditions: Condition 1: 100 ≤ A ≤ 150; and / or: 500 ≤ B ≤ 650; Condition 2: The distance between the protrusion and the adjacent recess in the direction perpendicular to the substrate is 850nm to 1000nm; Condition 3: The number of protrusions per unit area is 1 to 5 per μm. 2 ; Condition 4: The area of ​​the pit projected onto the substrate accounts for 80% to 95%.

4. The capacitive touch display device according to claim 2, characterized in that, The first moth eye membrane, the second moth eye membrane, and the third moth eye membrane each independently satisfy at least one of the following conditions: Condition 1, 20 ≤ A ≤ 50; and / or, 80 ≤ B ≤ 100; Condition 2: The distance between the protrusion and the adjacent recess in the direction perpendicular to the substrate is 650nm to 1000nm; Condition 3: The number of protrusions per unit area of ​​the moth eye membrane is 72-150 per μm. 2 .

5. The capacitive touch display device according to any one of claims 1 to 4, characterized in that, The first moth eye membrane, the second moth eye membrane, and the third moth eye membrane each independently satisfy the following: the thickness of the substrate is 100nm to 50μm, preferably, the thickness of the substrate is 210nm to 970nm.

6. The capacitive touch display device according to any one of claims 1 to 4, characterized in that, The first moth eye membrane, the second moth eye membrane, and the third moth eye membrane each independently satisfy the following: both the substrate and the protrusion include inorganic nanoparticles; the material of the inorganic nanoparticles is selected from at least one of zirconium oxide, silicon dioxide, or titanium oxide; and / or, the substrate and the protrusion further include a resin material; the resin material includes at least one of acrylic resin, polyurethane resin, or polyester resin.

7. The capacitive touch display device according to claim 6, characterized in that, The first moth eye membrane, the second moth eye membrane, and the third moth eye membrane each independently satisfy the following: based on the mass of the moth eye membrane, the mass percentage of the inorganic nanoparticles is 1% to 15%; and / or, the particle size of the inorganic nanoparticles satisfies: D100≤1μm, D90≤500nm, D50≤200nm.

8. The capacitive touch display device according to any one of claims 1 to 4, characterized in that, The anti-glare film has a haze value of 21% to 29%; and / or, The upper surface of the anti-glare film is also provided with an anti-fingerprint film.

9. The capacitive touch display device according to any one of claims 1 to 4, characterized in that, A first OCA optical adhesive layer is disposed between the capacitive touch sensor layer and the glass layer; the upper surface of the first OCA optical adhesive layer is attached to the second moth eye film, and the lower surface of the first OCA optical adhesive layer is attached to the capacitive touch sensor layer.

10. The capacitive touch display device according to claim 9, characterized in that, The capacitive touch sensor layer includes a first sensor layer and a second sensor layer; the first sensor layer and the second sensor layer satisfy at least one of the following conditions: Condition 1: The first sensor layer and the second sensor layer are each independently selected from at least one of indium tin oxide layer, silver nanolayer or metal mesh layer; Condition 2: The first sensor layer and the second sensor layer are bonded to each other, or... A second OCA optical adhesive layer is disposed between the first sensor layer and the second sensor layer. The upper surface of the second OCA optical adhesive layer is attached to the first sensor layer, and the lower surface of the second OCA optical adhesive layer is attached to the second sensor layer.

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