Touch display device and electronic equipment

Abstract

The invention provides a touch display device and electronic equipment, and is applied to the technical field of display. The touch control display device comprises a display panel, a touch control panel and a display module, the touch electrode layer and the cover plate are arranged on the light emitting side of the display panel in a stacked mode, a plurality of emitting electrodes arranged in an array mode and a plurality of receiving electrodes arranged in an array mode are arranged in the touch electrode layer, the emitting electrodes and the receiving electrodes are arranged in a crossed mode, and bridge points are arranged at the crossed positions; the first shadow eliminating layer is arranged between the cover plate and the touch electrode layer, and the first shadow eliminating layer is configured to have a first thickness and a first refractive index, so that the difference value between the reflectivity of a bridge point area where the bridge point is located and the reflectivity of other non-bridge point areas is within a first threshold value range.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more particularly to a touch display device and electronic device. Background Technology

[0002] Currently, most touch displays use an OGS (Optically Surface Mounted) structure. OGS refers to a touchscreen using a single-layer substrate, with the touch sensing functional layer directly mounted on the outermost protective plate, thus achieving a thinner and lighter design. However, the touch sensing functional layer suffers from noticeable bridging points during use, affecting the user experience.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] In view of this, the present disclosure provides a touch display device and an electronic device.

[0005] According to a first aspect of this disclosure, a touch display device is provided, comprising: a display panel; a touch electrode layer and a cover plate stacked on the light-emitting side of the display panel, wherein the touch electrode layer has a plurality of emitting electrodes arranged in an array and a plurality of receiving electrodes arranged in an array, the emitting electrodes and receiving electrodes being arranged in a cross-shaped manner and having a bridge point at the cross-point; and a first anti-reflection layer disposed between the cover plate and the touch electrode layer, the first anti-reflection layer being configured to have a first thickness and a first refractive index, such that the difference between the reflectivity of the bridge point region where the bridge point is located and the reflectivity of other non-bridge point regions is within a first threshold range.

[0006] A second aspect of this disclosure provides an electronic device, comprising: a device body and a touch display device disposed on the device body. The touch display device includes a display panel, a touch electrode layer and a cover plate stacked on the light-emitting side of the display panel, wherein a plurality of emitting electrodes and a plurality of receiving electrodes are disposed in an array within the touch electrode layer, the emitting electrodes and receiving electrodes are arranged in a cross pattern and a bridge point is provided at the intersection, and a first anti-reflection layer is disposed between the display panel and the touch electrode layer. The first anti-reflection layer is configured to have a first thickness and a first refractive index, such that the difference between the reflectivity of the bridge point region where the bridge point is located and the reflectivity of other non-bridge point regions is within a first threshold range.

[0007] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0008] The above and other objects, features and advantages of this disclosure will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0009] Figure 1A This schematic diagram illustrates the structure of a bridge point in the relevant art;

[0010] Figure 1B A schematic diagram illustrating the distribution of bridge points in related technologies is shown.

[0011] Figure 1C This schematically illustrates a state diagram showing the visibility of the bridge point in the screen-off state in related technologies;

[0012] Figure 2 A schematic cross-sectional view of a touch display device according to an embodiment of the present disclosure is shown.

[0013] Figure 3 A partial structural diagram of the touch electrode layer according to an embodiment of the present disclosure is shown schematically;

[0014] Figure 4A One of the schematic diagrams illustrating test results according to an embodiment of the present disclosure is shown in the illustration;

[0015] Figure 4B A second schematic diagram illustrating test results according to an embodiment of the present disclosure is shown.

[0016] Figure 4C This illustration schematically shows a display effect diagram according to an embodiment of the present disclosure;

[0017] Figure 5 A schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure is shown.

[0018] It should be noted that, for clarity, the dimensions of layers, structures, or regions in the accompanying drawings used to describe embodiments of this disclosure may be enlarged or reduced; that is, these drawings are not drawn to actual scale.

[0019] Figure Labels

[0020] 100. Touch display device; 110. Display panel; 120. Touch electrode layer; 121. Emitting electrode; 1211. Emitting electrode block; 1212. Connecting part; 122. Receiving electrode; 1221. Receiving electrode block; 1222. Bridging part; 130. Cover plate; 140. First anti-reflection layer; 150. First insulating layer; 160. Second anti-reflection layer; 170. Second insulating layer;

[0021] 200. Electronic device; 210. First body; 211. First display screen; 220. Second body; 221. Second display screen;

[0022] D1, first direction; D2, second direction. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0024] It should be noted that, for clarity and / or descriptive purposes, the dimensions and relative dimensions of components may be enlarged in the accompanying drawings. Therefore, the dimensions and relative dimensions of the individual components are not necessarily limited to those shown in the drawings. In the specification and accompanying drawings, the same or similar reference numerals indicate the same or similar parts.

[0025] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0026] In this document, unless otherwise specified, directional terms such as "up," "down," "left," "right," "inner," and "outer" are used to indicate orientation or positional relationships based on the accompanying drawings, and are used only for the convenience of describing this disclosure, and are not intended to indicate or imply that the device, element, or component referred to must have a specific orientation, or be constructed or operated in a specific orientation. It should be understood that when the absolute position of the described object changes, the relative positional relationships they represent may also change accordingly. Therefore, these directional terms should not be construed as limitations on this disclosure.

[0027] In this document, the terms “approximately,” “about,” “approximately,” and other similar terms are used as terms of approximation rather than as terms of degree, and they are intended to account for inherent deviations in measured or calculated values ​​that would be recognized by one of ordinary skill in the art. Taking into account factors such as process variations, measurement problems, and errors associated with the measurement of a particular quantity (i.e., limitations of the measurement system), “about” or “approximately” as used herein includes stated values ​​and indicates that a particular value is within an acceptable range of deviation for one of ordinary skill in the art. For example, “about” may mean within one or more standard deviations, or within ±10% or ±5% of the stated value.

[0028] In this document, the directional terms "first direction" and / or "second direction" are used to describe different orientations of a display module or display device, such as the light emission direction and horizontal direction of the display module. It should be understood that such representations are merely exemplary descriptions and not limitations of this disclosure.

[0029] This disclosure provides a touch display device and an electronic device. Before introducing the technical solutions provided by this disclosure, the relevant technologies involved in this disclosure will be described first.

[0030] As smartphones, tablets, wearable devices, and other electronic products rapidly evolve towards ultra-thin designs, narrow bezels, and high screen-to-body ratios, the integration of capacitive touch technology and display technology is becoming increasingly apparent. Among these, the OGS (One Glass Solution) capacitive touch solution, employing a single-layer inductive (SITO) structure, has become one of the mainstream technologies in the current capacitive touch field due to its advantages such as minimalist structure, further thinning of the device body, further narrowing of the bezels, and improved overall display transparency.

[0031] In traditional capacitive touch structures, refer to Figure 1AIn a typical touch sensing network, the transmitting electrode (Tx) and receiving electrode (Rx) are usually distributed on different layers, forming a complete touch sensing network through multi-layer stacking. However, in the SITO structure, the Tx and Rx electrodes are placed on the same plane, with electrical signal connection achieved through an insulating bridging structure between them. This bridging structure is commonly referred to as a "bridge point" in the industry. Bridge points are generally distributed in a regular array or specific arrangement within the touch sensing area to bridge electrical connection paths between multiple nodes within a limited space, thereby ensuring complete transmission of touch signals and stable touch performance. Furthermore, to reduce display module thickness and improve image display quality and touch sensitivity, SITO touch panels are often integrated with OLED and other display panels using a full lamination process. Full lamination effectively reduces air gap reflection, improves display contrast, and enhances touch response speed and accuracy. Therefore, the full lamination combination of the SITO-OGS touch structure and OLED display has been widely used in high-end smart terminals.

[0032] However, when the SITO touch panel is fully laminated to the OLED display, in situations where the device is off or in low-brightness mode, users can often observe regular dot-matrix patterns on the screen surface with the naked eye, such as... Figure 1B and Figure 1C As shown. This regular dot matrix is ​​usually periodically distributed, with a certain spatial frequency and directionality. Its position and shape have a clear correspondence with the distribution pattern of the bridge dots. Research has found that this phenomenon is mainly caused by the interference effect between the bridge dot array and the OLED display pixel arrangement: when ambient light undergoes multiple reflections, refractions, and scatterings on the bridge dot array and the OLED pixel array with a certain spatial periodic structure, obvious optical interference or moiré fringe effects will be generated between structures with different spatial frequencies. Under specific lighting conditions, viewing angles, and background display states, this ultimately manifests as a regular dot matrix or artifact visible to the human eye.

[0033] The aforementioned regular dot matrix phenomenon is more pronounced during normal use, especially in dark interface displays, low brightness modes, and indoor side-lighting or backlighting environments. This phenomenon, on the one hand, disrupts the consistency and clarity of the image, affecting the user's visual perception and subjective experience; on the other hand, users may easily mistake these visually perceptible regular dot matrices for display module defects, poor bonding, or panel quality issues, thereby questioning product quality and impacting the brand's reputation and market acceptance.

[0034] To mitigate or eliminate this regular dot matrix phenomenon, related technologies have attempted to reduce the interference effect by optimizing the bridge point distribution or adjusting the OLED pixel arrangement. However, these efforts are often limited by manufacturing processes or lead to a decrease in touch performance, failing to achieve good compatibility and stability. Therefore, how to effectively suppress or significantly reduce the regular dot matrix interference phenomenon generated after full lamination of the SITO touch structure and the OLED display without significantly sacrificing touch performance or changing the existing OLED pixel design and main process platform has become a pressing technical challenge in the field of integrated touch display.

[0035] The following will be through Figures 2-4C The touch display device according to the embodiments of this disclosure will be described in detail.

[0036] Figure 2 A partial structural schematic diagram of a touch display device according to an embodiment of the present disclosure is shown. Figure 3 A schematic diagram of a partial structure of a touch electrode layer according to an embodiment of the present disclosure is shown.

[0037] like Figure 2 As shown, the touch display device 100 of this embodiment includes: a touch electrode layer 120, a first anti-reflection layer 140 and a cover plate 130, which are stacked sequentially on the light-emitting side of the display panel 110.

[0038] The touch electrode layer 120 is provided with a plurality of transmitting electrodes 121 arranged in an array and a plurality of receiving electrodes 122 arranged in an array. The transmitting electrodes 121 and the receiving electrodes 122 are arranged in a cross pattern and a bridge point is provided at the intersection.

[0039] The first anti-reflection layer 140 is configured to have a first thickness and a first refractive index such that the difference between the reflectivity of the bridge point region where the bridge point is located and the reflectivity of other non-bridge point regions is within a first threshold range.

[0040] Exemplarily, the display panel 110 can be used to generate an image and display the generated image on a display area thereon. The light-emitting side of the display panel 110 can be the side of the display panel 110 that displays the image. The display panel 110 can also be other configurations, and the embodiments disclosed herein are not limited thereto; that is, those skilled in the art can adjust or configure it according to specific needs.

[0041] The cover plate 130 can be a transparent or semi-transparent protective substrate, mainly serving to provide mechanical protection, scratch resistance, improve the overall strength of the device, and enhance the touch feel.

[0042] The touch electrode layer 120 can be used to detect the touch position of conductive objects such as a user's finger or stylus, and the touch electrode layer 120 can process the detected touch position information to generate input information. The touch electrode layer 120 can be a single-layer inductive structure (SITO) or other capacitive touch structures.

[0043] The touch electrode layer 120 may include a transmitting electrode 121, a first insulating layer 150, and a receiving electrode 122 sequentially disposed on the display panel 110. For example, the transmitting electrode 121 is arranged in a strip or grid array along a first direction D1. The receiving electrode 122 is arranged in a strip or grid array along a second direction D2. The transmitting electrode 121 and the receiving electrode 122 may be made of transparent conductive materials, such as ITO (indium tin oxide). Since the transmitting electrode 121 and the receiving electrode 122 are arranged coplanarly, bridging structures are provided at their intersections or necessary locations to bridge the electrical signal path in order to achieve wire crossing and signal extraction. For example, refer to... Figure 3 The touch electrode layer 120 includes a transmitting electrode 121 (Tx) disposed along a first direction D1 and a receiving electrode 122 disposed perpendicular to the first direction D1. The transmitting electrode 121 (Tx) and the receiving electrode 122 intersect, and a bridging structure (bridging point) is provided at the intersection of the transmitting electrode 121 and the receiving electrode 122 in the orthogonal projection direction of the display panel 110, thereby preventing short circuits between the transmitting electrode 121 and the receiving electrode 122. Furthermore, the transmitting electrode 121 includes a plurality of continuously arranged transmitting electrode blocks 121 and a connecting portion 1212 connecting adjacent transmitting electrode blocks 121. The receiving electrode 122 includes a plurality of continuously arranged receiving electrode blocks 122 and a bridging portion 1222 connecting adjacent receiving electrode blocks 122. A first insulating layer 150 is provided between the connecting portion 1212 and the bridging portion 1222 to prevent short circuits between the bridging portion 1222 and the connection which is not directly perpendicular in the vertical direction. In this embodiment of the disclosure, for the sake of simplicity, the bridge point can be understood as a local three-dimensional structure located at the intersection of the transmitting electrode 121 and the receiving electrode 122, which is used to realize the electrical connection of the conductor crossing on the same plane.

[0044] The bridge point region can be the projected area that covers or includes the bridge point in the top view direction, including the bridge point itself and the area within a certain range around it, where the layered structure differs from that in the non-bridge point region.

[0045] Non-bridge point regions can be regions where no bridge point structure has been formed, typically uniform regions with only electrode patterns or insulating layers.

[0046] The difference between the reflectance of the bridge point region and the reflectance of other non-bridge point regions can be obtained by measuring the surface reflectance of the bridge point region and the non-bridge point region separately; the difference between the two is the reflectance difference. The reflectance of the bridge point region can be understood as: under preset observation conditions (e.g., perpendicular incidence or typical viewing angle), when incident light illuminates the region containing the bridge point structure, the ratio of the reflected light flux to the incident light flux, measured in units of that region. The reflectance of non-bridge point regions can be measured in a similar manner.

[0047] The first threshold can be a range of "maximum permissible difference" that the human eye finds difficult or hard to distinguish between the brightness / reflectivity differences of two regions under typical usage conditions. It should be noted that this disclosure does not impose a specific limitation on the size of the first threshold; the size of the first threshold can be adjusted according to the actual application. For example, the first threshold can be 6%, 3%, 2%, etc.

[0048] The first anti-reflection layer 140 has a first thickness and a first refractive index, such that the difference between the reflectivity of the bridge point region and the reflectivity of other non-bridge point regions is within a first threshold range. For example, the first thickness can be understood as the physical thickness of the first anti-reflection layer 140 in the direction perpendicular to the display panel. By adjusting the first thickness, interference caused by multiple reflections in the bridge point region and non-bridge point region can be enhanced or weakened under non-sensitive wavelengths or less noticeable visual conditions, thereby reducing the visible brightness difference. The first refractive index can be understood as the refractive index of the first anti-reflection layer 140 in the visible light wavelength range, which can be approximated by a single value or represented by the refractive index at 550 nm. By adjusting the first refractive index, the refractive indices of the first anti-reflection layer 140 are matched as closely as possible to those of the cover plate 130, the touch electrode layer 120 (or its insulating layer), thereby reducing the brightness difference caused by multiple reflections.

[0049] When the difference between the reflectance of the bridge point region and the reflectance of other non-bridge point regions is less than the first threshold, that is, below the threshold that the human eye can distinguish in a normal use environment, the regular dot matrix will be difficult to be captured by the naked eye. Ordinary observers will not perceive obvious bright spots or dark spots, thereby effectively reducing or eliminating interference dot matrix artifacts and improving display consistency and user experience.

[0050] It is understandable that by setting a first anti-reflection layer between the display panel and the touch electrode layer, the first anti-reflection layer with a first thickness and a first refractive index can make the reflectivity deviation between the bridge point area and the non-bridge point area less than a preset first threshold, thereby breaking up the periodic optical contrast of the bridge point and improving the hiding effect of the bridge point area.

[0051] In some embodiments, the first anti-reflection layer 140 ensures that the reflected light from each interface in the bridge point region satisfies the destructive interference condition, and the deviation between the reflectivity of the bridge point region and the non-bridge point region is less than 5%.

[0052] The destructive interference condition can be understood as an optical phenomenon where, when light waves reflected from multiple interfaces meet during propagation, the optical path difference causes the peaks and troughs to cancel each other out, thereby weakening or reducing the intensity of the synthesized light to zero. In the bridge point region of this embodiment, ambient light undergoes multiple reflections at the interfaces of each film layer as it passes through the cover plate 130, the first anti-reflection layer 140, and reaches the touch electrode layer 120. These interfaces include, but are not limited to, the interface between the cover plate 130 and the first anti-reflection layer 140, the interface between the first anti-reflection layer 140 and the surface of the touch electrode layer 120, and the interfaces between the sub-layers within the touch electrode layer 120. By precisely designing the thickness and refractive index of the first anti-reflection layer 140, the reflected light at these interfaces can form destructive interference within a specific wavelength range, i.e., there is an optical path difference of half a wavelength or an odd multiple of half a wavelength between the reflected light from adjacent interfaces, thereby achieving mutual cancellation of the reflected light.

[0053] For example, when light passes through the cover plate 130 and enters the first anti-reflection layer 140, at the interface between the first anti-reflection layer 140 and the cover plate 130, some light is reflected to form the first reflected light; the transmitted light continues to propagate to the interface between the first anti-reflection layer 140 and the touch electrode layer 120, where it is reflected again to form the second reflected light. Since the film structure of the touch electrode layer 120 at the bridge point is more complex than in the non-bridge point region, including multiple layers such as the emitting electrode 121, the first insulating layer 150, and the receiving electrode 122, multiple reflected lights, such as the third and fourth reflected lights, will also be generated in the bridge point region. By reasonably configuring the optical thickness of the first anti-reflection layer 140 (i.e., the product of the physical thickness and the refractive index), the first reflected light, the second reflected light, and other multiple reflected lights in the bridge point region can satisfy the destructive interference condition. Specifically, the optical path difference between adjacent reflected lights should be close to half the wavelength of visible light or an odd multiple thereof, so that these reflected lights cancel each other out when superimposed, thereby significantly reducing the overall reflectivity of the bridge point region.

[0054] In non-bridge point areas, due to the relatively simple and uniform film structure, reflected light mainly originates from a few interfaces between the display panel 110 and the touch electrode layer 120, resulting in a low overall reflectivity. However, in bridge point areas, without anti-reflection treatment, the multiple reflections caused by the stacked multilayer films often lead to a significantly higher overall reflectivity than in non-bridge point areas, creating a brightness difference. Introducing the first anti-reflection layer 140 effectively suppresses the intensity of reflected light in bridge point areas through a destructive interference mechanism, reducing the overall reflectivity of bridge point areas to a level close to that of non-bridge point areas.

[0055] The deviation in reflectivity can be understood as the absolute value of the difference between the overall reflectivity of the bridge point region and the overall reflectivity of the non-bridge point region, divided by the overall reflectivity of the non-bridge point region, expressed as a percentage. For example, assuming that without the first anti-reflection layer 140, the reflectivity of the non-bridge point region is 7.89%, while the reflectivity of the bridge point region reaches 8.63% due to the superposition of multiple layers, the reflectivity deviation is (8.63% - 7.89%) / 7.89% ≈ 9.3%. This deviation will cause the bridge point region to appear as a noticeable bright spot under ambient light, easily detected by the human eye. After introducing the first anti-reflection layer 140 and ensuring that the reflected light from each interface satisfies the destructive interference condition, the reflectivity of the bridge point region can be reduced to 7.49%. At this point, the reflectivity deviation is (7.49% - 7.29%) / 7.29% ≈ 2.7%, far less than the 5% threshold, making the bridge point difficult to observe in the screen-off state.

[0056] When the reflectance deviation is less than 5%, the human eye's ability to perceive the brightness difference between the bridge point area and the non-bridge point area decreases significantly under typical indoor lighting or natural light conditions. According to research on human visual characteristics, when the brightness difference between two adjacent areas is less than approximately 5% to 10%, it is generally difficult for an observer to distinguish the difference at normal viewing distances and angles. Therefore, controlling the reflectance deviation to within 5% can effectively achieve optical concealment of the bridge point and avoid the occurrence of regular dot matrix phenomena.

[0057] It is understandable that by ensuring the thickness and refractive index of the first anti-reflection layer meet specific optical design conditions, and utilizing the destructive interference effect in the thin film interference principle, a phase cancellation mechanism for multi-interface reflected light can be established in the bridge point region. This allows the reflectivity deviation between the bridge point region and the non-bridge point region to be controlled within a preset range, effectively eliminating the bridge point and improving the visual uniformity and product appearance quality of the touch display device in the screen-off state.

[0058] In some embodiments, the thickness of the first anti-reflection layer is 2 μm to 10 μm, and the first refractive index of the first anti-reflection layer is 1.60 to 1.66.

[0059] For example, the thickness of the first anti-reflection layer 140 can be understood as the physical thickness of the film layer in the direction perpendicular to the surface of the display panel 110. This thickness directly affects the propagation path length of light within the first anti-reflection layer 140, thereby determining the optical path difference between reflected light from different interfaces. When the thickness is too small, the optical path difference between reflected light from each interface is insufficient to form effective destructive interference; when the thickness is too large, it may lead to the emergence of higher-order interference modes, which increases the volatility of reflectivity and also increases manufacturing costs and process complexity. By controlling the thickness within the range of 2μm to 10μm, stable destructive interference conditions can be established in the visible light band, while taking into account both process feasibility and cost control. For example, the first thickness of the first anti-reflection layer 140 can be 2μm, 4μm, 5μm, 7μm, 10μm, etc.

[0060] The first refractive index can be understood as the ability of the first anti-reflection layer 140 material to refract visible light, usually represented by the refractive index at a wavelength of 550 nm. The refractive index determines the intensity of reflection and the phase change of transmitted light at different film layer interfaces. When the refractive index of the first anti-reflection layer 140 differs too much from that of adjacent film layers (such as the cover plate 130 or the surface of the touch electrode layer 120), the interface reflectivity will increase significantly. When the refractive indices are too close, although the interface reflection is weakened, it is difficult to achieve reflectivity matching between the bridge point region and the non-bridge point region through interference control. Setting the first refractive index in the range of 1.60 to 1.66 can form a reasonable optical transition between the commonly used cover plate 130 material (refractive index is usually 1.47 to 1.52) and the touch electrode material (ITO refractive index is usually 1.80 to 2.00), which can reduce the reflectivity of a single interface and achieve precise control of the overall reflectivity through multi-interface interference. For example, the first refractive index of the first ablation layer 140 can be 1.60, 1.61 μm, 1.64 μm, 1.65 μm, 1.66 μm, etc.

[0061] In one example, assume that the cover plate 130130 is made of glass with a refractive index of approximately 1.52, and the ITO material on the surface of the touch electrode layer 120120 has a refractive index of approximately 1.90. If the refractive index of the first anti-reflective layer 140140 is 1.63, this refractive index is intermediate between the cover plate 130 and the touch electrode layer 120, forming a stepped refractive index transition. In this configuration, ambient light undergoes a first refraction when entering the cover plate 130 from air (refractive index approximately 1.00), a second refraction when entering the first anti-reflective layer 140 from the cover plate 130, and a third refraction when entering the touch electrode layer 120 from the first anti-reflective layer 140. Each refraction produces partial reflected light at the interface. By setting the thickness of the first anti-reflection layer 140 to 5 μm, an optical path difference of about half a wavelength (near the visible light center wavelength of 550 nm) can be generated between the reflected light at the interface between the first anti-reflection layer 140 and the cover plate 130 and the reflected light at the interface between the first anti-reflection layer 140 and the touch electrode layer 120, thereby forming destructive interference and significantly reducing the intensity of the combined reflected light at these two interfaces.

[0062] Furthermore, in the bridge point region, due to the presence of multiple layers such as the emitting electrode 121, the first insulating layer 150, and the receiving electrode 122, more reflective interfaces are generated. By rationally selecting the thickness and refractive index of the first anti-reflection layer 140, the overall control effect of the first anti-reflection layer 140 on the multiple reflected light in the bridge point region can be optimized.

[0063] The refractive index of the first anti-reflection layer 140 can be calculated using TFCalc optical simulation software by combining the refractive index (n), extinction coefficient (k), and film thickness of each base layer. This allows for the calculation of the superposition of reflected light from each interface in the bridge point region. The calculation formula is as follows:

[0064]

[0065] Where n1 is the refractive index of the film, n g δ is the refractive index of the cover plate, n0 is the refractive index of the incident medium, and δ1 is the phase thickness of the film.

[0066] Understandably, by setting the thickness of the first anti-reflection layer to between 2μm and 10μm and the first refractive index to between 1.60 and 1.66, effective control of multi-interface reflected light in the bridge point area can be achieved under existing process conditions. By utilizing the principle of destructive interference, the reflectivity deviation between the bridge point area and the non-bridge point area can be controlled within 5%, thereby effectively hiding the bridge point and improving the visual quality of the touch display device.

[0067] In some embodiments, the touch display device 100 further includes a second anti-shading layer 160 disposed on the touch electrode layer 120, wherein the first anti-shading layer 140 is configured with a first chromaticity parameter and the second anti-shading layer 160 is configured with a second chromaticity parameter, such that the chromaticity deviation ΔE between the bridge point region and the non-bridge point region is less than 3.

[0068] For example, the second anti-reflection layer 160 may be disposed on the side of the touch electrode layer 120 away from the first anti-reflection layer 140, for example, between the touch electrode layer 120 and the display panel 110.

[0069] Chromaticity parameters can be characterized using the CIELab color space. In the CIELab color space, L represents lightness, ranging from 0 to 100, with larger values ​​indicating brighter light; a represents red-green hue, with positive values ​​leaning towards red and negative values ​​towards green; b represents yellow-blue hue, with positive values ​​leaning towards yellow and negative values ​​towards blue. The first and second chromaticity parameters correspond to the L, a, and b values ​​measured under transmitted light conditions on the first and second ablation layers 140 and 160, respectively.

[0070] Chromaticity deviation ΔE can be understood as: measuring the transmitted chromaticity values ​​of the bridge point region and the non-bridge point region under the same light source and observation conditions, and calculating the chromaticity difference between the two regions according to the CIELab color space. The formula for calculating chromaticity deviation ΔE is:

[0071] ΔE=

[0072] Wherein, ΔL, Δa, and Δb* are the differences in brightness, red-green hue, and yellow-blue hue between the bridge point region and the non-bridge point region, respectively.

[0073] When ΔE < 3, the human eye can hardly distinguish the color difference between the two regions under normal observation distance and ambient lighting conditions, which can be considered as good color matching.

[0074] In the bridge point region, due to the superposition of multiple film systems such as the emitting electrode 121, receiving electrode 122, and first insulating layer 150, the light passing through this region undergoes multiple refractions and absorptions, resulting in a specific hue in the transmitted light. In the non-bridge point region, the film structure is relatively simple, and the hue of the transmitted light differs from that in the bridge point region. By providing a second anti-reflection layer 160 in the touch electrode layer 120, the chromaticity of the transmitted light in the non-bridge point region or the entire film system can be adjusted to make it more consistent with the chromaticity of the bridge point region.

[0075] Furthermore, the chromaticity parameters of the first anti-reflection layer 140 and the second anti-reflection layer 160 need to be coordinated and controlled. Specifically, the material composition, thickness, or manufacturing process parameters of the first anti-reflection layer 140 can be adjusted to ensure that the chromaticity value of the transmitted light of the first anti-reflection layer 140 meets a specific range; at the same time, the material composition, thickness, or manufacturing process parameters of the second anti-reflection layer 160 can be adjusted to ensure that the chromaticity value of the transmitted light of the second anti-reflection layer 160 is complementary or synergistic with that of the first anti-reflection layer 140, thereby controlling the chromaticity deviation between the bridging point region and the non-bridging point region within the range of ΔE < 3.

[0076] In one example, the touch display device 100 includes a display panel 110, a second anti-reflection layer 160, a touch electrode layer 120, a first anti-reflection layer 140, and a cover plate 130 stacked sequentially. The touch electrode layer 120 includes a transmitting electrode 121 arranged along a first direction D1 and a receiving electrode 122 arranged along a second direction D2, with a bridging point at the intersection of the transmitting electrode 121 and the receiving electrode 122. The first anti-reflection layer 140 is disposed between the cover plate 130 and the touch electrode layer 120, and the second anti-reflection layer 160 is disposed between the touch electrode layer 120 and the display panel 110.

[0077] The transmitted light chromaticity parameters of the first anti-reflection layer 140 were measured to be: L*=95.2, a*=-2.1, b*=1.3. The transmitted light chromaticity parameters of the second anti-reflection layer 160 were measured to be: L*=94.8, a*=-3.5, b*=6.7. By measuring the transmitted light chromaticity values ​​of the bridge point area and the non-bridge point area respectively, the chromaticity value of the bridge point area was L*=94.5, a*=-2.8, b*=3.2, and the chromaticity value of the non-bridge point area was L*=95.0, a*=-2.9, b*=3.5. According to the chromaticity deviation calculation formula, ΔE≈0.59, which is much less than 3, thus meeting the chromaticity matching requirements. Under this configuration, even in typical usage environments such as indoor natural light or office lighting, when users observe the display device in the off state from a normal viewing distance (approximately 25~40cm), they cannot distinguish the color difference between the bridge point area and the non-bridge point area, and the visual visibility of the bridge point is significantly suppressed.

[0078] It is understandable that by setting a second anti-reflection layer on the touch electrode layer and configuring the chromaticity parameters of the first and second anti-reflection layers, chromaticity matching can be further achieved on the basis of reflectivity matching, so that the chromaticity deviation ΔE between the bridge point area and the non-bridge point area is less than 3, thereby comprehensively improving the optical hiding effect of the bridge point, ensuring that the display device presents a uniform visual experience under various lighting conditions, and further improving the visual quality and user experience of the product.

[0079] In some embodiments, the first anti-reflection layer 140 is a composite film mainly prepared by mixing silicon oxynitride material and silicon dioxide, and the second anti-reflection layer 160 is a film mainly prepared by mixing silicon oxynitride material; wherein, the mass ratio of silicon oxynitride material to silicon dioxide in the first anti-reflection layer 140 is (2~3):1.

[0080] For example, the material selection of the first anti-reflection layer 140 and the second anti-reflection layer 160 directly affects their refractive index, chromaticity parameters, and optical matching effect with adjacent films. Silicon oxynitride (SiN) material can be represented as SiN. X O Y The nitrogen-oxygen ratio can be adjusted through the preparation process parameters, thereby achieving continuous tunability of refractive index and chromaticity. Silica material, which can be represented as SiO2, has a low refractive index and good light transmittance. By combining silicon oxynitride with silica, refractive index and chromaticity characteristics between the two materials can be obtained while maintaining film stability, enabling precise control of the optical parameters of the first anti-reflection layer 140.

[0081] The first anti-reflection layer 140 employs a composite film structure, which can be achieved by simultaneously or alternately introducing silicon oxynitride and silicon dioxide during the fabrication process, resulting in a uniformly mixed or multi-layered structure within the film. The refractive index of the composite film can be estimated based on the mass ratio of the two materials and their respective refractive indices according to the effective medium theory. Furthermore, the chromaticity parameters of the composite film can also vary with the material ratio; that is, by adjusting the mass ratio of silicon oxynitride to silicon dioxide, the refractive index and transmitted light chromaticity value of the first anti-reflection layer 140 can be controlled within a wide range to meet the dual requirements of reflectivity and chromaticity matching with the bridge point region.

[0082] For example, when preparing the first anti-reflection layer 140, the mass ratio of silicon oxynitride material to silicon dioxide material can be controlled within the range of 2:1 to 3:1. This mass ratio range is a preferred range determined after experimental verification. Within this range, the refractive index of the first anti-reflection layer 140 can be controlled between 1.60 and 1.66, and the transmitted light chromaticity parameters can be controlled within the range of L*=90 to 99, a*=-4 to 4, and b*=-4 to 5, which can meet the requirements of dual matching of reflectivity and chromaticity with the bridge point region.

[0083] For example, when the mass ratio of silicon oxynitride to silicon dioxide is 2:1, the refractive index of the composite film is approximately 1.60, exhibiting a slightly warm tone when light is transmitted; when the mass ratio is 3:1, the refractive index of the composite film is approximately 1.66, exhibiting a slightly cool tone when light is transmitted. By adjusting the mass ratio within this range, the optimal combination of optical parameters can be flexibly matched according to the specific bridge point film structure and the characteristics of the display panel 110.

[0084] The second anti-reflection layer 160 is prepared using a single silicon oxynitride material. By adjusting parameters such as the nitrogen-oxygen ratio and film thickness, the second anti-reflection layer 160 can provide a suitable refractive index transition between the touch electrode layer 120 and the display panel 110. Simultaneously, its chromaticity parameters can synergize with those of the first anti-reflection layer 140. Silicon oxynitride material has advantages such as a wide adjustable refractive index range, good film uniformity, and excellent compatibility with touch electrode materials such as ITO, making it suitable as the base material for the anti-reflection layer.

[0085] Furthermore, the material selection for the first anti-reflection layer 140 and the second anti-reflection layer 160 needs to comprehensively consider refractive index matching, chromaticity synergy, and the feasibility of the fabrication process. The first anti-reflection layer 140 adopts a composite film structure, which can provide greater freedom in parameter adjustment and is suitable for placement between the cover plate 130 and the touch electrode layer 120, undertaking the main functions of reflectivity matching and chromaticity adjustment. The second anti-reflection layer 160 adopts a single material structure, with a relatively simple process, and is suitable for placement between the touch electrode layer 120 and the display panel 110, providing auxiliary functions of refractive index transition and chromaticity compensation. The synergistic effect of the two anti-reflection layers can achieve optical optimization at different interfaces, thereby comprehensively improving the hiding effect of the bridge point.

[0086] In one example, the touch display device 100 includes a display panel 110, a second anti-reflection layer 160, a touch electrode layer 120, a first anti-reflection layer 140, and a cover plate 130 stacked sequentially. The first anti-reflection layer 140 is prepared with a silicon oxynitride to silicon dioxide material mass ratio of 2.5:1. The first anti-reflection layer 140 has a thickness of 6 μm, a refractive index of 1.63, and transmitted light chromaticity parameters of L*=94.5, a*=-2.5, and b*=0.8. The second anti-reflection layer 160 is made of silicon oxynitride. The second anti-reflection layer 160 has a thickness of 4 μm, a refractive index of 1.75, and transmitted light chromaticity parameters of L*=93.8, a*=-3.2, and b*=5.5. In this configuration, the reflectance and chromaticity values ​​of the bridge point region and the non-bridge point region are measured respectively. The reflectance of the bridge point area is 0.0751, and the chromaticity values ​​are L*=94.1, a*=-2.9, and b*=2.8. The reflectance of the non-bridge point area is 0.0732, and the chromaticity values ​​are L*=94.2, a*=-2.8, and b*=3.0. The reflectance deviation is (0.0751-0.0732) / 0.0732×100%≈2.6%, which is less than 5%, meeting the reflectance matching requirements. The chromaticity deviation ΔE≈0.24, which is much less than 3, meeting the chromaticity matching requirements. In actual use, regardless of indoor lighting, natural light, or outdoor shaded environments, users cannot visually detect the presence of bridge points, and the display device presents a highly uniform visual effect.

[0087] It is understandable that by using a composite film of silicon oxynitride and silicon dioxide as the first anti-reflection layer and controlling the mass ratio of the two materials within the range of (2~3):1, while using silicon oxynitride as the second anti-reflection layer, precise control of refractive index and chromaticity parameters can be achieved at the material level. This ensures that the optical performance of the first and second anti-reflection layers meets the requirements for bridge point hiding in the manufacturing process, and ensures that the touch display device has excellent visual quality in various usage scenarios.

[0088] In some embodiments, the touch display device 100 further includes: a first insulating layer 150 disposed at least in the bridge point region between the transmitting electrode 121 and the receiving electrode 122, the refractive index of the first insulating layer 150 being the same as the refractive index of the first anti-reflection layer 140; and a second insulating layer 170 disposed on the side of the second anti-reflection layer 160 away from the display panel 110.

[0089] For example, the first insulating layer 150 is mainly used to achieve electrical isolation between the transmitting electrode 121 and the receiving electrode 122 inside the touch electrode layer 120, so as to avoid short circuits between the two electrodes at the intersection. In the conventional design of the touch electrode layer 120, the first insulating layer 150 is usually made of organic insulating materials or inorganic insulating materials such as silicon oxide. Its refractive index is often significantly different from that of the touch electrode material and the anti-reflection layer material, resulting in a discontinuous film refractive index distribution in the bridge point region. When light passes through the bridge point region, a significant abrupt change in reflectivity occurs, thereby forming a visible optical artifact.

[0090] By making the refractive index of the first insulating layer 150 the same as that of the first anti-reflection layer 140, a smooth transition of the refractive index gradient between the layers in the bridging region can be achieved, reducing optical inhomogeneities caused by interface reflection. When light passes sequentially from the cover plate 130 through the first anti-reflection layer 140 and the touch electrode layer 120 to the first insulating layer 150, the interface reflectivity between the first anti-reflection layer 140 and the first insulating layer 150 can be reduced to an extremely low level because the refractive indices of the first anti-reflection layer 140 and the first insulating layer 150 are the same, further reducing the difference in reflectivity between the bridging region and the non-bridging region.

[0091] The refractive index of the first insulating layer 150 is the same as that of the first anti-reflection layer 140. This can be understood as follows: when preparing the first insulating layer 150, a material system that is the same as or similar to that of the first anti-reflection layer 140 is selected, or the refractive index of the first insulating layer 150 is made consistent with that of the first anti-reflection layer 140 by adjusting the preparation process parameters. For example, when the first anti-reflection layer 140 is a composite film of silicon oxynitride and silicon dioxide with a refractive index of 1.63, the first insulating layer 150 can also be prepared using the same silicon oxynitride and silicon dioxide composite material. By controlling the mass ratio of the two materials and the deposition process parameters, the refractive index of the first insulating layer 150 can also reach 1.63. In this way, in the bridge point region, light entering the first insulating layer 150 from the first anti-reflection layer 140 hardly undergoes a sudden change in refractive index, and interface reflection is effectively suppressed.

[0092] The second insulating layer 170 is disposed on the side of the second anti-reflection layer 160 away from the display panel 110. This can be understood as the second insulating layer 170 being located between the second anti-reflection layer 160 and the touch electrode layer 120. The placement of the second insulating layer 170 provides mechanical buffering and electrical isolation between the touch electrode layer 120 and the second anti-reflection layer 160. Furthermore, the design of its refractive index and thickness also affects the overall optical performance of the film. By rationally configuring the material and thickness of the second insulating layer 170, the optical matching effect between the bridge point region and the non-bridge point region can be further optimized based on the second anti-reflection layer 160.

[0093] Furthermore, the first insulating layer 150 and the second insulating layer 170 need to work in synergy with the first anti-reflection layer 140 and the second anti-reflection layer 160. The first insulating layer 150 achieves optical continuity within the bridge point region through refractive index matching, reducing the reflectivity jump caused by the bridge point structure itself. The second insulating layer 170 introduces an appropriate refractive index transition between the touch electrode layer 120 and the second anti-reflection layer 160, making the refractive index distribution of the entire film system more gradual in the vertical direction, avoiding the reflection enhancement phenomenon caused by excessive refractive index steps. The synergistic effect of the two insulating layers can achieve optical optimization in both the bridge point region and the non-bridge point region, thereby completely eliminating the visual visibility of the bridge point in both reflectivity and chromaticity dimensions.

[0094] In one example, referring to Figure 1, we will use a first threshold of 5% as an example. In the non-bridge point region, as light passes through the cover plate 130, the first anti-reflection layer 140, and reaches the touch electrode layer 120, it will undergo multiple reflections at the interfaces of each film layer. For example, the light is reflected at the interface between the cover plate 130 and the first anti-reflection layer 140 to obtain the reflected light R. a1 The light continues to propagate and is reflected at the interface between the first anti-reflection layer 140 and the touch electrode layer 120 to obtain reflected light R. a2The light continues to propagate and is reflected at the interface between the second insulating layer 170 and the cover plate 130, resulting in reflected light R. a3 In the bridge point region, as light passes sequentially through the cover plate 130, the first anti-reflection layer 140, and reaches the touch electrode layer 120, it undergoes multiple reflections at the interfaces of each film layer. For example, the light is reflected at the interface between the cover plate 130 and the first anti-reflection layer 140 to obtain reflected light R. a1 The light continues to propagate and is reflected at the interface between the first ablation layer 140 and the first electrode to obtain the reflected light ray R. a2 The light continues to propagate and is reflected at the interface between the first insulating layer 150 and the second electrode, resulting in reflected light R. b1 The light continues to propagate and is reflected at the interface between the second insulating layer 170 and the cover plate 130, resulting in reflected light R. b2 By precisely designing the first refractive index and first thickness of the first anti-reflection layer 140, the reflected light from each interface in the bridging point region satisfies the destructive interference condition, thereby making the overall reflectivity similar to that of the non-bridging point region, i.e.: [|(R a1 +R a2 +R a3 )-(R a1 '+R a2 '+R b1 +R b2 )| / (R a1 +R a2 +R a3 )]*100%≤5%.

[0095] For example, the first anti-reflection layer 140 is prepared using a composite film of silicon oxynitride and silicon dioxide with a mass ratio of 2.5:1, a thickness of 6 μm, and a refractive index of 1.63. The first insulating layer 150 is also prepared using a composite material of silicon oxynitride and silicon dioxide. By precisely controlling the flow rates of silane, ammonia, nitrous oxide, and oxygen in the plasma-enhanced chemical vapor deposition process, the mass ratio of silicon oxynitride to silicon dioxide in the deposited first insulating layer 150 is also 2.5:1, with a thickness of 1.2 μm and a refractive index of 1.63. Since the first anti-reflection layer 140 and the first insulating layer 150 have the same refractive index, in the bridge point region, when light passes from the first anti-reflection layer 140 through the touch electrode and enters the first insulating layer 150, the interface reflectivity is only 0.0003, far lower than the interface reflectivity of 0.015 under refractive index mismatch conditions. The overall reflectivity in the bridge point region is significantly reduced.

[0096] The second anti-reflective layer 160 is made of pure silicon oxynitride material, with a thickness of 4 μm and a refractive index of 1.75. The second insulating layer 170 is also made of silicon oxynitride material, with a thickness of 0.8 μm and a refractive index of 1.70, and is disposed between the second anti-reflective layer 160 and the touch electrode layer 120. The refractive index of the second insulating layer 170 is between the refractive index of the second anti-reflective layer 160 (1.75) and the refractive index of the touch electrode material ITO (1.85), forming a smooth refractive index transition and reducing reflection at the interface between the second anti-reflective layer 160 and the touch electrode layer 120.

[0097] The reflectance and chromaticity values ​​of the bridge point region and the non-bridge point region were measured separately. The reflectance of the bridge point region was 0.0689, and the chromaticity values ​​were L = 94.3, a = -2.7, and b = 2.5. The reflectance of the non-bridge point region was 0.0682, and the chromaticity values ​​were L = 94.4, a = -2.6, and b = 2.6. The reflectance deviation was approximately 1.0% (<5%), meeting the reflectance matching requirements. The chromaticity deviation ΔE was approximately 0.17 (<3%), meeting the chromaticity matching requirements. In practical use, even in strong light environments or under tilted viewing angles, the optical differences between the bridge point region and the non-bridge point region remain imperceptible to the human eye, and the touch display device 100 exhibits extremely high visual uniformity.

[0098] Understandably, by setting a first insulating layer with the same refractive index as the first anti-reflection layer, a continuous transition of refractive index can be achieved within the bridge point, eliminating the abrupt change in reflectivity caused by the bridge point structure itself. Simultaneously, by setting a second insulating layer, refractive index gradient optimization is provided between the touch electrode layer and the second anti-reflection layer, further reducing interface reflection. The synergistic effect of the two insulating layers and the two anti-reflection layers can comprehensively suppress the visual visibility of the bridge point across a wider viewing angle range and under more diverse lighting conditions, ensuring that the touch display device has excellent display quality and user experience in various usage scenarios.

[0099] In some embodiments, the first chromaticity parameter satisfies at least the following conditions: the value of lightness is in the range of 90 to 99, the value of red-green chromaticity is in the range of -4 to 4, and the value of yellow-blue chromaticity is in the range of -4 to 5.

[0100] For example, the first chromaticity parameter refers to the CIELab color space parameter measured by the first anti-reflection layer 140 under transmitted light conditions. The value of the luminance value L* ranges from 90 to 99, indicating that the first anti-reflection layer 140 has good light transmission performance and will not cause significant attenuation of the brightness of the display panel 110. When the luminance value is below 90, the light transmittance of the first anti-reflection layer 140 decreases significantly, which may lead to a decrease in the overall brightness of the display panel 110 and affect the display effect; when the luminance value is close to 99, the first anti-reflection layer 140 is almost completely transparent, and its ability to adjust the chromaticity of light is weakened.

[0101] The red-green hue value a* ranges from -4 to 4, indicating that the transmitted light from the first anti-reflection layer 140 can exhibit a continuous adjustment in red-green hue, from a slight greenish to a slight reddish hue. Because the bridge point region contains a multi-layered film structure, its transmitted light often exhibits a certain shift in red-green hue. By controlling the red-green hue value of the first anti-reflection layer 140 within this range, the red-green hue of the bridge point region can be compensated for or matched, making the bridge point region and non-bridge point region more consistent in red-green hue.

[0102] The yellow-blue tint value b* ranges from -4 to 5, indicating that the transmitted light from the first anti-reflection layer 140 can be continuously adjusted in terms of yellow-blue hue, from a slight bluish to a slight yellowish tint. This range covers the transition area from neutral to warm tones, adapting to the yellow-blue tint compensation needs of different bridge point structures and display panel 110 characteristics. When the yellow-blue tint value is negative, the transmitted light exhibits a cool tone; when the yellow-blue tint value is positive, the transmitted light exhibits a warm tone.

[0103] In some embodiments, the second chromaticity parameter satisfies at least the following conditions: the value of lightness is in the range of 90 to 99, the value of red-green is in the range of -3 to 4, and the value of yellow-blue is in the range of 0 to 11.

[0104] For example, the second chromaticity parameter refers to the CIELab color space parameter measured by the second anti-shadow layer 160 under transmitted light conditions. The value range of the lightness value L* is also 90~99, ensuring that the second anti-shadow layer 160 also has good light transmission performance and maintains coordination with the first anti-shadow layer 140 in the lightness dimension.

[0105] The red-green hue value a* ranges from -3 to 4, which is slightly narrower than the range of the first anti-reflection layer 140. Specifically, the lower limit of adjustment in the green direction is adjusted from -4 to -3, while the upper limit of adjustment in the red direction remains at 4. This range is set based on the structural characteristics of the second anti-reflection layer 160, which is located between the touch electrode layer 120 and the display panel 110. The transmitted light needs to pass through the ITO material of the touch electrode layer 120, and the ITO material itself exhibits a slight green hue in red-green hue. Given that ITO already provides a certain amount of green hue, the second anti-reflection layer 160 only needs a small adjustment space in the green direction to meet the overall color matching requirements. Therefore, the lower limit of a* in the green direction is reduced to -3, while the upper limit is set to 4, leaving sufficient adjustment margin in the red direction to comprehensively compensate for the system's color deviation. This reduces the visual visibility of the bridge point while ensuring that the overall ΔE is controlled.

[0106] The yellow-blue tint value b* ranges from 0 to 11, which is significantly different from the range of the first anti-reflection layer 140. It does not include negative values, and the upper limit of positive values ​​is extended to 11. This range is set because the second anti-reflection layer 160 needs to compensate for the difference in yellow-blue tint between the touch electrode layer 120 and the display panel 110. These film structures often cause the transmitted light to appear yellowish. Therefore, the yellow-blue tint value of the second anti-reflection layer 160 needs to have greater adjustment capability in the yellowish direction, while not needing to be adjusted in the blueish direction.

[0107] Furthermore, the range settings of the first and second chromaticity parameters need to be considered in conjunction. The first anti-reflection layer 140 mainly adjusts the chromaticity difference between the cover plate 130 and the touch electrode layer 120, and its chromaticity parameter range should cover the hue shift that may occur in the bridge point area under reflected and transmitted light conditions. The second anti-reflection layer 160 mainly adjusts the chromaticity difference between the touch electrode layer 120 and the display panel 110, and its chromaticity parameter range should be optimized for the touch electrode material and the optical characteristics of the display panel 110. The chromaticity parameters of the two anti-reflection layers are consistent in the brightness dimension, and differentiated in the red-green and yellow-blue hues according to their respective functional positioning, thereby achieving the optimal effect of chromaticity matching in the overall film system.

[0108] It is understandable that by clearly defining the value ranges of the first and second chromaticity parameters, clear quality control standards can be provided in the fabrication process, ensuring that the chromaticity performance of the first anti-reflection layer 140 and the second anti-reflection layer 160 meets the requirements for bridge point hiding.

[0109] In some embodiments, the area of ​​the bridge point region is less than the second threshold.

[0110] For example, the area of ​​the bridge point region refers to the projected area of ​​a single bridge point parallel to the surface of the cover plate.

[0111] The area of ​​the bridge point region being smaller than the second threshold can be understood as follows: by optimizing the structural design of the bridge points, the projected area of ​​a single bridge point is controlled within a certain range, ensuring that even if there are extremely small differences in optical performance, the bridge points will not be recognized by the human eye due to their excessive size. The setting of the second threshold needs to comprehensively consider various factors such as the spatial resolution of the human eye, the pixel density of the display device, the viewing distance, and the differences in reflectivity and color between bridge points and non-bridge points.

[0112] The specific value of the second threshold needs to be adjusted according to the pixel density of the display device. For display devices with high pixel density, the size of a single pixel is small, and even if the bridge point area occupies the area of ​​several pixels, its physical size is still small, and its impact on the visual effect is limited. For display devices with low pixel density, the size of a single pixel is large, and if the bridge point area occupies too many pixels, even if the optical difference within a single pixel is small, the cumulative effect of the entire bridge point area may still lead to visible visual artifacts.

[0113] To facilitate the explanation of the display effect between the touch display device of the present disclosure embodiment and a conventional touch display device, the following will be combined with Figures 4A-4C Further verification and explanation are required.

[0114] Figure 4A This diagram illustrates one of the test results for a conventional touch display device. Figure 4B A schematic diagram of test results according to an embodiment of the present disclosure is shown in Figure 2. Figure 4C The illustration shows a schematic diagram of the display effect according to an embodiment of the present disclosure.

[0115] In one example, the touch display device 100 includes a display panel 110, a second anti-reflection layer 160, a touch electrode layer 120, a first anti-reflection layer 140, and a cover plate 130 stacked sequentially. The first anti-reflection layer 140 is prepared with a silicon oxynitride to silicon dioxide material mass ratio of 2.5:1. The first anti-reflection layer 140 has a thickness of 6 μm, a refractive index of 1.63, and transmitted light chromaticity parameters of L*=94.5, a*=-2.5, and b*=0.8. The second anti-reflection layer 160 is made of silicon oxynitride. The second anti-reflection layer 160 has a thickness of 4 μm, a refractive index of 1.75, and transmitted light chromaticity parameters of L*=93.8, a*=-3.2, and b*=5.5. In this configuration, the reflectance and chromaticity values ​​of the bridge point region and the non-bridge point region are measured respectively. The reflectance of the bridge point region is 0.0749, and the chromaticity values ​​are L*=94.1, a*=-2.9, and b*=2.8. The reflectance of the non-bridge point region is 0.0729, and the chromaticity values ​​are L*=94.2, a*=-2.8, and b*=3.0. The reflectance deviation is ≈2.7% < 5%, which meets the reflectance matching requirements. The chromaticity deviation ΔE ≈ 2.04 < 3.

[0116] Meanwhile, the test results of touch structure devices prepared by traditional processes were used for comparison, and the results are shown in Table 1:

[0117] Table 1

[0118] Bridge point hiding effect Bridge point region reflectivity Non-bridge point region reflectivity Percentage difference in reflectance Color deviation ΔE old techniques 0.0863 0.0789 9.3% 3.86 New process 0.0749 0.0729 2.7% 2.04

[0119] The new process refers to a touch display device prepared using the method of this embodiment, while the old process refers to a touch display device prepared using a conventional process.

[0120] The measured reflectance values ​​of the bridge point area and other areas during sample debugging are as follows: Figure 4A and Figure 4B Based on gradient sample results, it was determined that when the reflectance deviation between the bridge point region and other regions is <5% and the chromaticity deviation ΔE is <3, the bridge point exhibits superior hiding effectiveness (e.g., ...). Figure 4C (As shown).

[0121] Figure 4A The reflectance curves of the bridge point area and non-bridge point area of ​​the touch display device fabricated using conventional processes are shown. Figure 4B The diagram shows reflectance curves for the bridge point region and non-bridge point region locations of a touch display device employing an embodiment of the present disclosure. Specifically, it shows the reflectance variation with wavelength.

[0122] The light source is white light, the transmission medium is air, the substrate is glass, and the emission medium is glass. The incident angle is 0 degrees, and the polarization is average (polarization state is not distinguished). The evaluation method is the difference in reflectivity at 55nm.

[0123] right Figure 4A and Figure 4B Analysis shows that, under the unoptimized structure ( Figure 4A The reflectance curves of the bridge point region and the non-bridge point region deviate significantly in the visible light band, especially at 550nm, where the difference in reflectance between the two curves is large. This results in a perceptible brightness unevenness at the bridge point location in actual display, thus forming regular dot matrix artifacts. In contrast, after adopting the solution of this invention and introducing a first anti-reflection layer with a specific thickness and refractive index ( Figure 4B The reflectance spectra of the bridge point region and the non-bridge point region are more similar overall, and the reflectance difference at 550nm is significantly reduced, falling within the preset threshold range. For the green light band, which is most sensitive to the human eye, the brightness difference between bridge points and non-bridge points is effectively suppressed, making the regular dot matrix corresponding to the bridge points virtually indistinguishable in actual use. This verifies the technical effect of this invention in significantly reducing or eliminating bridge point interference artifacts and improving display uniformity.

[0124] Based on the above-described touch display device method, this disclosure also provides an electronic device.

[0125] This disclosure also provides an electronic device 200, which includes a device body and a touch display device 100 disposed on the device body.

[0126] The touch display device 100 includes a display panel 110, a touch electrode layer 120 and a cover plate 130 stacked on the light-emitting side of the display panel 110. The touch electrode layer 120 has a plurality of emitting electrodes 121 arranged in an array and a plurality of receiving electrodes 122 arranged in an array. The emitting electrodes 121 and the receiving electrodes 122 are arranged in a cross pattern and a bridge point is provided at the intersection. A first anti-reflection layer 140 is disposed between the cover plate 130 and the touch electrode layer 120. The first anti-reflection layer 140 is configured to have a first thickness and a first refractive index, such that the difference between the reflectivity of the bridge point area where the bridge point is located and the reflectivity of other non-bridge point areas is within a first threshold range.

[0127] It should be noted that the touch display device 100 in the electronic device 200 provided in this disclosure is similar to the description of the touch display device 100 embodiment described above, and has similar beneficial effects as the touch display device 100 embodiment described above. For technical details not disclosed in the embodiments of the electronic device 200 of this disclosure, please refer to the description of the touch display device 100 embodiment in this disclosure for understanding, and will not be repeated here.

[0128] Electronic device 200 can be any device or product with a display function. For example, electronic device 200 can be a smartphone, mobile phone, e-book reader, desktop computer (PC), laptop PC, netbook PC, personal digital assistant (PDA), portable multimedia player (PMP), digital audio player, mobile medical device, camera, wearable device (such as head-mounted device, electronic clothing, electronic bracelet, electronic necklace, electronic accessory, electronic tattoo, or smartwatch), television set, etc.

[0129] Electronic device 200 may be a device with a display screen, and the display screen may include a touch display device 100, such as: electronic device 200 may be a tablet computer or a single-screen laptop computer with a display screen and a physical button area or a foldable mobile phone with a foldable display screen; electronic device 200 may also be a device with multiple display screens, and at least one of the multiple display screens may include a touch display device 100, such as a dual-screen laptop computer, and one of the screens has the function of touch input of information.

[0130] Figure 5 A schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure is shown.

[0131] In some embodiments, such as Figure 5 As shown, the device body also includes a first body 210 and a second body 220 that are rotatably connected. The touch display device 100 is disposed on the first body 210 and / or the second body 220.

[0132] For example, the electronic device 200 is a foldable smartphone. The first body 210 and the second body 220 are connected by a pivot mechanism located at the middle position. The pivot mechanism adopts a multi-link structure and can achieve smooth rotation within the range of 0 degrees to 180 degrees.

[0133] Touch display devices 100 are disposed on the inner surfaces of the first body 210 and the second body 220. The touch display devices 100 corresponding to the first body 210 and the second body 220 are continuous structures, meaning the display screen of the electronic device 200 is a continuous, deformable flexible display screen. In the unfolded state, the angle between the first body 210 and the second body 220 is 180 degrees, and the touch display devices 100 together form a large-screen display area. In the folded state, the angle between the first body 210 and the second body 220 is close to 0 degrees, and the opposite sides of the touch display devices 100 and the first body 210 and the second body 220 are face-to-face. In this state, the display screen is closed.

[0134] In other examples, the touch display device 100 includes a first screen area 211 and a second screen area 221, the first screen area 211 being displayed on a first surface of the first body 210 and the second screen area 221 being housed in the first body 210 or the second body 220. In a first usage mode, the second screen area 221 is pulled out from the first body 210 or the second body 220 and is housed in the first body 210 or the second body 220 in a second usage mode.

[0135] For example, the electronic device may be a rollable screen mobile phone. The touch display device 100 is a continuous, deformable flexible display screen.

[0136] The first usage mode is when the rollable screen phone's display is unfolded. The second usage mode is when the rollable screen phone's display is retracted.

[0137] The first screen area 211 and the second screen area 221 are continuous, meaning that the second screen area 221 of the display screen of the electronic device 200 is connected to the main body. When the display screen is in the unfolded state, the first screen area 211 is the area of ​​the display screen that the user can see. When the display screen is in the unfolded state, the second screen area 221 is the area of ​​the display screen that the user cannot see.

[0138] In some embodiments, the first anti-reflection layer ensures that the reflected light from each interface in the bridge point region satisfies the destructive interference condition, and the deviation between the reflectivity of the bridge point region and the non-bridge point region is less than 5%.

[0139] For an explanation of the first anti-reflection layer, please refer to the description of the touch display device mentioned above; it will not be repeated here.

[0140] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0141] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A touch display device, comprising: Display panel; A touch electrode layer and a cover plate are stacked on the light-emitting side of the display panel. The touch electrode layer contains a plurality of emitting electrodes arranged in an array and a plurality of receiving electrodes arranged in an array. The emitting electrodes and the receiving electrodes are arranged in a cross pattern and a bridge point is provided at the intersection. A first anti-reflection layer is disposed between the cover plate and the touch electrode layer. The first anti-reflection layer is configured to have a first thickness and a first refractive index, such that the difference between the reflectivity of the bridge point region where the bridge point is located and the reflectivity of other non-bridge point regions is within a first threshold range.

2. The touch display device according to claim 1, wherein the first anti-reflection layer enables the reflected light from each interface in the bridge point region where the bridge point is located to satisfy the destructive interference condition, and the deviation between the reflectivity of the bridge point region and the non-bridge point region is less than 5%.

3. The touch display device according to claim 1, wherein the thickness of the first anti-reflection layer is 2μm~10μm, and the first refractive index of the first anti-reflection layer is 1.60~1.

66.

4. The touch display device according to claim 1, wherein the touch display device further comprises a second anti-shading layer disposed on the touch electrode layer, the first anti-shading layer being configured with a first chromaticity parameter and the second anti-shading layer being configured with a second chromaticity parameter, such that the chromaticity deviation ΔE between the bridge point region and the non-bridge point region is less than 3.

5. The touch display device according to claim 4, wherein the first anti-shadow layer is a composite film layer mainly prepared by mixing silicon oxynitride material and silicon dioxide, and the second anti-shadow layer is a film layer mainly prepared by mixing silicon oxynitride material; in, The mass ratio of silicon oxynitride material to silicon dioxide in the first anti-reflection layer is (2-3):

1.

6. The touch display device according to claim 4, wherein the first chromaticity parameter satisfies at least the following conditions: The value of brightness ranges from 90 to 99. The red-green hue value ranges from -4 to 4. The value of yellow-blue saturation ranges from -4 to 5; And / or, The second chromaticity parameter must satisfy at least the following conditions: The value of brightness ranges from 90 to 99. The red-green hue value ranges from -3 to 4. The value of yellow-blue tint ranges from 0 to 11.

7. The touch display device according to claim 1 or 3, wherein the touch display device further comprises: A first insulating layer is provided at least in the bridge point region between the transmitting electrode and the receiving electrode; A second insulating layer is disposed between the second anti-reflection layer and the display panel; The refractive index of the first insulating layer is the same as that of the first anti-reflection layer.

8. The touch display device according to claim 7, wherein the area of ​​the bridge point region is less than the second threshold.

9. An electronic device, comprising: The device body and the touch display device disposed on the device body, The touch display device includes a display panel, a touch electrode layer and a cover plate stacked on the light-emitting side of the display panel, a plurality of emitting electrodes and a plurality of receiving electrodes arranged in an array within the touch electrode layer, the emitting electrodes and the receiving electrodes being arranged in a cross pattern and having a bridge point at the intersection, and a first anti-reflection layer disposed between the display panel and the touch electrode layer, the first anti-reflection layer being configured to have a first thickness and a first refractive index, such that the difference between the reflectivity of the bridge point region where the bridge point is located and the reflectivity of other non-bridge point regions is within a first threshold range.

10. The electronic device according to claim 9, wherein the device body comprises a first body and a second body rotatably connected; The touch display device is disposed on the first body and / or the second body; or, The touch display device includes a first screen area and a second screen area. The first screen area is displayed on a first side of the first body, and the second screen area is stored in the first body or the second body. In a first usage mode, the second screen area is pulled out from the first body or the second body, and in a second usage mode, it is stored in the first body or the second body. And / or, The first anti-reflection layer ensures that the reflected light from each interface in the bridge point region satisfies the destructive interference condition, and the deviation between the reflectivity of the bridge point region and the non-bridge point region is less than 5%.

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