TW202109257A - Touch display device - Google Patents

Abstract

A touch display device including a display panel, a touch panel, a polarizer, an optical matching layer and an anti-glare structure layer. The display panel includes a display region and a non-display region. The touch panel is disposed on the display panel and includes a cover plate, a light shielding layer, a touch electrode layer and an index matching layer. The light shielding layer is disposed between the cover plate and the display panel. The light shielding layer is correspondingly disposed to the non-display region of the display panel. The touch electrode layer and the index matching layer are stacked on the cover plate and are disposed on a surface of the cover plate adjacent to the display panel. The polarizer is disposed between the display panel and the touch panel. The optical matching layer is disposed on a surface of the cover plate far from the display panel. The anti-glare structure layer is disposed on a surface of the polarizer far from the display panel and/or is disposed on a surface of the optical matching layer far from the display panel.

Description

Touch display device

The present invention relates to a touch display device, and more particularly to a touch display device with low reflection and low chromatic aberration.

In order for the display device to reduce the reflectivity of the ambient light to it and have a good display effect, an optical matching layer is generally provided on the outer surface of the display device to achieve an anti-reflection effect. However, the non-display area of the display device is generally provided with a border ink layer. Based on this, when the display device is not in use, there will be a significant color difference between the display area and the non-display area, which makes the display The boundary between the area and the non-display area will be easily observed. This phenomenon is more obvious after the optical matching layer is installed. Therefore, how to enable the display device to achieve the effects of low reflection and low chromatic aberration at the same time is a topic that needs to be worked hard.

The present invention provides a touch display device, which has the effects of low reflection and low chromatic aberration at the same time.

The touch display device of the present invention includes a display panel, a touch panel, a polarizing plate, an optical matching layer and an anti-glare structure layer. The display panel includes a display area and a non-display area. The touch panel is arranged on the display panel and includes a cover plate, a light shielding layer, a touch electrode layer and a refractive index matching layer. The light shielding layer is arranged between the cover plate and the display panel. The light-shielding layer is substantially arranged corresponding to the non-display area of the display panel. The touch electrode layer and the refractive index matching layer are laminated on the cover plate and arranged on the surface of the cover plate close to the display panel. The polarizing plate is arranged between the display panel and the touch panel. The optical matching layer is arranged on the surface of the cover plate away from the display panel. The anti-glare structure layer is arranged on the surface of the polarizing plate away from the display panel and/or on the surface of the optical matching layer away from the display panel.

In an embodiment of the present invention, the aforementioned refractive index matching layer includes a first refractive index matching layer and a second refractive index matching layer. The second index matching layer is closer to the display panel than the first index matching layer.

In an embodiment of the present invention, the aforementioned first refractive index matching layer has a refractive index of 1.60-2.40, and the second refractive index matching layer has a refractive index of 1.38-1.52.

In an embodiment of the present invention, the aforementioned first refractive index matching layer has a thickness of 5 nm-15 nm, and the second refractive index matching layer has a thickness of 20 nm-50 nm.

In an embodiment of the present invention, the material of the above-mentioned first refractive index matching layer includes silicon oxynitride, niobium oxide, silicon nitride or a combination thereof, and the material of the second refractive index matching layer includes magnesium fluoride, magnesium dioxide Silicon, silicon oxynitride, or a combination thereof.

In an embodiment of the present invention, the above-mentioned optical matching layer includes a first optical matching layer and a second optical matching layer. The first optical matching layer is closer to the display panel than the second optical matching layer.

In an embodiment of the present invention, the material of the above-mentioned optical matching layer includes titanium dioxide, silicon dioxide, silicon oxynitride, niobium oxide or a combination thereof.

In an embodiment of the present invention, the aforementioned anti-glare structure layer includes a plurality of protruding structures.

In an embodiment of the present invention, the aforementioned touch electrode layer is formed as a film layer.

Based on the above, the touch display device of the present invention is provided with an optical matching layer and a refractive index matching layer on the outer surface and inside of the touch panel, which can have an anti-reflection effect and can make the display area and the non-display area Consistent color. Based on this, the touch display device of the present invention can simultaneously have the effects of low reflection and low chromatic aberration.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

Hereinafter, the present invention will be explained more fully with reference to the drawings of this embodiment. However, the present invention can also be embodied in various different forms and should not be limited to the embodiments described herein. The thickness of the layers and regions in the drawing will be exaggerated for clarity. The same or similar reference numbers indicate the same or similar elements, and the following paragraphs will not repeat them one by one. In addition, the directional terms mentioned in the embodiments, for example: up, down, left, right, front or back, etc., are only directions for referring to the attached drawings. Therefore, the directional terms used are used to illustrate but not to limit the present invention.

FIG. 1 is a schematic cross-sectional view of a touch display device according to an embodiment of the invention.

1, the touch display device 10 of this embodiment includes a display panel 100, a touch panel 200, a polarizing plate 300, an optical matching layer 400 and an anti-glare structure layer 500.

The display panel 100 may include, for example, an active device array substrate (not shown), a color filter substrate (not shown), a sealant (not shown), and a display medium layer (not shown). From another perspective, the display panel 100 may have a display area DR and a non-display area NR.

The active device array substrate may, for example, include a plurality of active devices (not shown), a plurality of scan lines (not shown), a plurality of data lines (not shown), a plurality of pixel electrodes (not shown), and a plurality of For the common electrode (not shown), each active device can be electrically connected to the corresponding scan line and the corresponding data line, but the invention is not limited to this. Each pixel electrode can, for example, form an electric field with the corresponding common electrode to drive the liquid crystal molecules of the liquid crystal layer to rotate, so that the display panel 100 can display images on the display side, but the invention is not limited to this.

The color filter substrate may, for example, include at least three color filter patterns, each of which can be converted into different colors and arranged corresponding to sub-pixels (for example, sub-pixels of different colors). In an embodiment, the different colors converted by the color filter pattern may be, for example, three primary colors, which may be red, green, and blue, for example, but the invention is not limited thereto.

The sealant is, for example, disposed between the active device array substrate and the color filter substrate. From another perspective, the sealant is disposed in the non-display area NR of the display panel 100. The sealant may, for example, include a plurality of sealant spacers (not shown). For example, the sealant is, for example, conductive particles with a specific size or spacers with a specific shape, but the present invention is not limited thereto. The sealant can be formed, for example, by irradiating ultraviolet light and then curing, and is used to bond the active device array substrate and the color filter substrate.

The display medium layer is filled, for example, in the accommodating space formed by the sealant, the active device array substrate and the color filter substrate. From another perspective, the display medium layer is disposed in the display area DR of the display panel 100. The display medium layer may include non-self-luminous materials, such as liquid crystal molecules, electrophoretic display medium, or other applicable mediums as examples. When a non-self-luminous material is used for the display medium layer, the display panel 100 may include other backlight light sources (not shown). In other embodiments, the display medium layer may include a self-luminous material, such as an inorganic material, an organic material, or a combination of the foregoing materials. In this embodiment, the display medium layer is liquid crystal molecules. The liquid crystal molecules are preferably liquid crystal molecules that can be rotated or switched by a vertical electric field or liquid crystal molecules that can be rotated or switched by a lateral electric field, but the present invention is not limited thereto.

The touch panel 200 may, for example, include a cover 210, a light shielding layer 220, a refractive index matching layer 230, and a touch electrode layer 240.

The cover 210 can be used to carry other components of the touch panel 200 and has the purpose of protecting the above-mentioned other components. In some embodiments, the material of the cover plate 210 includes, for example, an inorganic material or an organic material. For example, the material of the cover plate 210 may be a transparent material such as glass or acrylic.

The light shielding layer 220 is, for example, disposed between the cover 210 and the display panel 100. The type of the light shielding layer 220 is, for example, a frame-shaped ink layer, which is disposed on the edge of the cover plate 210. From another perspective, the light shielding layer 220 is substantially disposed corresponding to the non-display area NR of the display panel 100.

The touch electrode layer 240 is, for example, disposed between the cover 210 and the display panel 100. The material of the touch electrode layer 240 may include, for example, a transparent conductive material. For example, the material of the touch electrode layer 240 may be metal oxides such as indium tin oxide, tin oxide, zinc oxide, indium oxide, magnesium oxide, or a combination thereof. The shape of the touch electrode layer 240 may be, for example, a rhombus, triangle, hexagon, or other geometric shapes, or a mesh wire, but the present invention is not limited thereto. In this embodiment, the touch electrode layer 240 is formed as a film layer, which can reduce the reflectivity and the color difference between the display area and the non-display area.

The refractive index matching layer 230 is also disposed between the cover plate 210 and the display panel 100, for example. In detail, the refractive index matching layer 230 and the touch electrode layer 240 are laminated on the cover plate 210 and are disposed on the surface of the cover plate 210 close to the display panel 100. In other words, the refractive index matching layer 230 and the touch electrode layer 240 are disposed inside the touch panel 200.

In an embodiment, the refractive index matching layer 230 includes a multilayer structure formed by overlapping a matching layer with a relatively high refractive index and a matching layer with a relatively low refractive index. In this embodiment, the refractive index matching layer 230 includes a two-layer structure composed of a first refractive index matching layer 230a and a second refractive index matching layer 230b, but the present invention is not limited to this, that is, refractive index matching The layer 230 may include a structure of more than two layers. In this embodiment, the second refractive index matching layer 230b is closer to the display panel 100 than the first refractive index matching layer 230a, and the second refractive index matching layer 230b has a refractive index lower than that of the first refractive index matching layer 230a. rate.

In one embodiment, the order of the laminated structure formed on the surface of the cover 210 close to the display panel 100 is: a first refractive index matching layer 230a, a second refractive index matching layer 230b, and a touch electrode layer 240, as shown in FIG. 1 shown. The refractive index matching layer 230 of this configuration can be used to avoid the problem that the touch electrode layer 240 interferes with the display image of the display panel 100 under the illumination of the ambient light of the touch display device 10. However, the present invention is not limited to the above configuration. In another embodiment, the order of the laminated structure formed on the surface of the cover 210 close to the display panel 100 is: the touch electrode layer 240, the first refractive index matching layer 230a, and the second refractive index matching layer 230b. The refractive index matching layer 230 of this configuration can be used to adjust the balance between the area with the touch electrode layer 240 and the area without the touch electrode layer 240 in the display area when the ambient light penetrates the touch electrode layer 240 and then is reflected. The color difference of the area is to prevent the etching marks of the touch electrode layer 240 from being observed by consumers. In another embodiment, the order of the laminated structure formed on the surface of the cover 210 close to the display panel 100 is: the first refractive index matching layer 230a, the touch electrode layer 240, and the second refractive index matching layer 230b.

In addition, the refractive index matching layer 230 can control the ambient light reflected from the display area DR and the ambient light reflected by the non-display area NR (for example, the light-shielding layer 220), and the optical destructive interference generated by the reflected ambient light after entering each layer It can effectively reduce the color difference between the display area DR and the non-display area NR, so that the display side of the touch display device 10 has a consistent appearance effect. Based on this, it is not easy for consumers to observe the color difference between the display area DR and the non-display area NR of the touch display device 10 from the appearance, and a good look and feel effect can be obtained.

The first refractive index matching layer 230a has, for example, a refractive index of 1.60-2.40, and a thickness of 5nm-15nm. The material of the first index matching layer 230a may include silicon oxynitride, niobium oxide, silicon nitride, or a combination thereof. The second refractive index matching layer 230b has, for example, a refractive index of 1.38-1.52, and a thickness of 20nm-50nm. The material of the second index matching layer 230b may include magnesium fluoride, silicon dioxide, silicon oxynitride, or a combination thereof. The aforementioned refractive index, thickness, and material of the first refractive index matching layer 230a and the second refractive index matching layer 230b can be changed according to requirements, and the present invention is not particularly limited.

The polarizing plate 300 is disposed between the display panel 100 and the touch panel 200, for example. The polarizing plate 300 can be adhered to the display panel 100 and the touch panel 200 by, for example, a transparent optical glue (not shown), but the invention is not limited thereto. The light vibrating in all directions becomes light vibrating in a single direction after passing through the polarizing plate 300, that is, light vibrating in other directions will be shielded or absorbed by the polarizing plate 300. Controlling the polarization direction of the light by the polarizing plate 300 enables the display panel 100 to produce a contrast between light and darkness to display images.

The optical matching layer 400 is, for example, disposed on the surface of the cover 210 away from the display panel 100. In other words, the optical matching layer 400 is disposed on the outer surface of the touch panel 200. The optical matching layer 400 can be used for anti-reflection, anti-staining or anti-glare, which allows consumers to clearly see the picture displayed through the display panel 100. The material of the optical matching layer 400 may include titanium dioxide, silicon dioxide, silicon oxynitride, niobium oxide, or a combination thereof. The optical matching layer 400 may be, for example, a single-layer structure or a multi-layer structure. In some embodiments, the optical matching layer 400 is composed of a two-layer structure with different refractive indexes, but the invention is not limited thereto. For example, the aforementioned two-layer structure may each have a refractive index of 1.80-2.40 and 1.38-1.52.

The anti-glare structure layer 500 is, for example, disposed on the surface of the polarizer 300 away from the display panel 100 and/or on the surface of the optical matching layer 400 away from the display panel 100. The anti-glare structure layer 500 can be used to produce sufficient scattering of incident ambient light and have anti-glare capability. In detail, in one embodiment, as shown in FIG. 2A, the anti-glare structure layer 500 is disposed on the surface of the polarizer 300 away from the display panel 100, which can prevent most of the ambient light from being incident on the display panel 100 and affecting the display. The panel 100 has the effect of displaying images, and in addition, it can reduce the interference of the reflected ambient light on the refractive index matching layer 230 for reducing chromatic aberration. In another embodiment, as shown in FIG. 2B, the anti-glare structure layer 500 is disposed on the surface of the optical matching layer 400 away from the display panel 100, which can prevent most of the ambient light from being incident on the touch panel 200 to further avoid The etching marks of the touch electrode layer 240 are observed by consumers.

The shape of the anti-glare structure layer 500 may be, for example, a rough surface composed of a plurality of convex structures. The material of the anti-glare structure layer 500 may include, for example, acrylic resin, or acrylic resin added with nano particles with adjustable refractive index or nano particles with a core-shell structure.

Example

The touch display devices of Embodiment 1 to Embodiment 3 and Comparative Example 1 to Comparative Example 3 will be introduced below. The touch display device of Embodiment 1 to Embodiment 3 is shown in FIG. 1, and the difference is that the optical matching layer 400 has different materials and/or structures. The touch display device of Comparative Example 1 does not have the optical matching layer 400 in the touch display device shown in FIG. 1. Although the touch display device of Comparative Example 2 has the optical matching layer 400, the refractive index matching layer 230 has a two-layer structure, that is, it includes a first refractive index matching layer 230a and a second refractive index matching layer 230b. The material of the first refractive index matching layer 230a is silicon oxynitride with a refractive index of 2.10 and a thickness of 20 nm, and the material of the second refractive index matching layer 230b is magnesium fluoride with a refractive index of 1.47 and a thickness of 60 nm. The touch display device of Comparative Example 3 does not have the optical matching layer 400 in the touch display device shown in FIG. 1, and the refractive index matching layer 230 has a two-layer structure, that is, it includes the first refractive index matching layer. The layer 230a and the second index matching layer 230b. The material of the first refractive index matching layer 230a is silicon oxynitride with a refractive index of 1.92 and a thickness of 20 nm, and the material of the second refractive index matching layer 230b is magnesium fluoride with a refractive index of 1.45 and a thickness of 65 nm. The materials and thicknesses of the optical matching layer 400 in the touch display devices of Embodiment 1 to Embodiment 3 and Comparative Example 2 will be described in detail below.

Embodiment 1: The optical matching layer 400 has a two-layer structure, that is, includes a first optical matching layer and a second optical matching layer, wherein the first optical matching layer is closer to the display panel 100 and the material of the first optical matching layer is silicon oxynitride It has a thickness of 21 nm, and the material of the second optical matching layer is silicon dioxide and has a thickness of 119 nm.

Embodiment 2: The optical matching layer 400 has a four-layer structure, that is, includes the first optical matching layer to the fourth optical matching layer, and the first optical matching layer is closer to the display panel 100. The material of the first optical matching layer is titanium dioxide and has a thickness of 12nm, the material of the second optical matching layer is silicon dioxide and has a thickness of 30nm, the material of the third optical matching layer is titanium dioxide and has a thickness of 120nm, and the fourth optical The material of the matching layer is silicon dioxide and has a thickness of 88 nm.

Embodiment 3: The optical matching layer 400 has a four-layer structure, that is, includes the first optical matching layer to the fourth optical matching layer, and the first optical matching layer is closer to the display panel 100. The material of the first optical matching layer is zirconium dioxide and has a thickness of 16nm, the material of the second optical matching layer is silicon dioxide and has a thickness of 30nm, and the material of the third optical matching layer is zirconium dioxide and has a thickness of 131nm The material of the fourth optical matching layer is silicon dioxide and has a thickness of 85 nm.

Comparative Example 2: The optical matching layer 400 has a two-layer structure, that is, it includes a first optical matching layer and a second optical matching layer, wherein the first optical matching layer is closer to the display panel 100. The material of the first optical matching layer is zirconium dioxide and has a thickness of 15 nm, and the material of the second optical matching layer is silicon dioxide and has a thickness of 129 nm.

In addition, the touch display devices of Example 1 to Example 3 and Comparative Example 1 to Comparative Example 3 were calculated for the optical chromatic aberration value and the reflectance difference value, wherein the calculation of the optical chromatic aberration value can be established in the international standard The value measured in the CIELAB color space is substituted into the following formula (1).

∆E=((L1-L2) ² +(a1-a2) ² +(b1-b2) ² ) ^1/2 ……… Formula (1), where: L1: the amount of light reflected by the standard light source in the display area The brightness of the color; L2: the brightness of the color of the light reflected by the standard light source in the non-display area; a1: the degree of red and green contrast of the light reflected by the standard light source in the display area; a2: the color of the standard light source reflected in the non-display area The degree of red and green opposition of light; b1: the degree of yellow-blue opposition of the light reflected by the standard light source in the display area; b2: the degree of yellow-blue opposition of the light reflected by the standard light source in the non-display area.

The above measurement data includes L1, L2, a1, a2, b1, b2, and ∆R (@ 550nm) (when the wavelength of the standard light source is 550nm, the difference in reflectance between the display area and the non-display area is Value), which are described in Table 1 and Table 2.

[Table 1] Example 1 Example 2 Example 3 Comparative example 1 L1 17.25 19.29 18.8 27.85 L2 18.18 19.86 21.58 28.59 a1 -0.26 0.81 2.52 -0.29 a2 1.13 2.55 2.01 0.48 b1 0.2 -2.48 0.43 -0.01 b2 1.95 -0.68 1.94 1.01 ∆E 2.57 2.5 2.86 1.47 ∆R(@550nm) 2.23 2.71 2.65 5.41

[Table 2] Comparative example 2 Comparative example 3 L1 18.03 28.6 L2 11.4 25.44 a1 0.15 -0.27 a2 1.18 0.09 b1 -4.31 -2.55 b2 0.02 -0.12 ∆E 7.98 4 ∆R(@550nm) 2.45 5.07

For Embodiment 1 to Embodiment 3, the arrangement of the optical matching layer 400 greatly reduces the reflectivity of the ambient light to the touch display device 10, which allows consumers to clearly see the screen displayed by the touch display device 10. Although the optical matching layer 400 has a slight increase in the chromatic aberration value in the display area and the non-display area due to its anti-reflection, anti-smudge or anti-glare effects, it still has a lower value due to the refractive index matching layer 230. Color difference value to obtain a better appearance display effect. In contrast, the touch display device of Comparative Example 1 still has a relatively large reflectivity because it is not provided with the optical matching layer 400. Although the touch display device of Comparative Example 2 is provided with the optical matching layer 400 so that the reflectance is greatly reduced, the chromatic aberration value in the display area and the non-display area is because the refractive index matching layer 230 does not have the aforementioned embodiment of the present invention. The design cannot compensate for the problem of increasing the chromatic aberration value brought about by the optical matching layer 400, so that the boundary between the display area and the non-display area will be easily observed. The touch display device of Comparative Example 3 also has a higher reflectivity when the optical matching layer 400 is not provided, and the refractive index matching layer 230 included therein does not have the design of the foregoing embodiment of the present invention. It exhibits a higher color difference between the display area and the non-display area.

In summary, the touch display device of the present invention can have anti-reflection, anti-dirt or anti-glare effects by providing an optical matching layer on the outer surface of the touch panel. In addition, the touch display device of the present invention A refractive index matching layer is further provided inside the touch panel, which can compensate for the increased color difference between the display area and the non-display area caused by the optical matching layer, and can make the display area and the non-display area have Consistent color and prevent the boundary between the display area and the non-display area from being observed. Based on this, the touch display device of the present invention can simultaneously have the effects of low reflection and low chromatic aberration.

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

10: Touch display device 100: display panel 200: touch panel 210: cover 220: shading layer 230: refractive index matching layer 230a: The first refractive index matching layer 230b: second refractive index matching layer 240: Touch electrode layer 300: Polarizing plate 400: Optical matching layer 500: Anti-glare structure layer DR: display area NR: Non-display area

FIG. 1 is a schematic cross-sectional view of a touch display device according to an embodiment of the invention. 2A is a schematic cross-sectional view of the relative positions of the anti-glare structure layer and the polarizing plate according to an embodiment of the present invention. 2B is a schematic cross-sectional view of the relative positions of the anti-glare structure layer and the optical matching layer according to another embodiment of the present invention.

10: Touch display device

100: display panel

200: touch panel

210: cover

220: shading layer

230: refractive index matching layer

230a: The first refractive index matching layer

230b: second refractive index matching layer

240: Touch electrode layer

300: Polarizing plate

400: Optical matching layer

500: Anti-glare structure layer

DR: display area

NR: Non-display area

Claims (9)

A touch display device includes: Display panel, including display area and non-display area; The touch panel is arranged on the display panel, wherein the touch panel includes: Cover A light-shielding layer disposed between the cover plate and the display panel, wherein the light-shielding layer is substantially disposed corresponding to the non-display area of the display panel; and A touch electrode layer and a refractive index matching layer, wherein the touch electrode layer and the refractive index matching layer are laminated on the cover plate and arranged on the surface of the cover plate close to the display panel; The polarizing plate is arranged between the display panel and the touch panel; The optical matching layer is disposed on the surface of the cover plate away from the display panel; and The anti-glare structure layer is arranged on the surface of the polarizing plate away from the display panel and/or on the surface of the optical matching layer away from the display panel. The touch display device according to the first item of the scope of patent application, wherein the refractive index matching layer includes a first refractive index matching layer and a second refractive index matching layer, wherein the second refractive index matching layer is larger than the first refractive index matching layer. A refractive index matching layer is close to the display panel. The touch display device according to the second item of the scope of patent application, wherein the first refractive index matching layer has a refractive index of 1.60-2.40, and the second refractive index matching layer has a refractive index of 1.38-1.52. The touch display device according to the second item of the scope of patent application, wherein the first refractive index matching layer has a thickness of 5 nm to 15 nm, and the second refractive index matching layer has a thickness of 20 nm to 50 nm. The touch display device according to claim 2, wherein the material of the first refractive index matching layer includes silicon oxynitride, niobium oxide, silicon nitride or a combination thereof, and the second refractive index matching layer The material includes magnesium fluoride, silicon dioxide, silicon oxynitride or a combination thereof. The touch display device according to claim 1, wherein the optical matching layer includes a first optical matching layer and a second optical matching layer, wherein the first optical matching layer is larger than the second optical matching layer Close to the display panel. The touch display device according to the first item of the scope of patent application, wherein the material of the optical matching layer includes titanium dioxide, silicon dioxide, silicon oxynitride, niobium oxide or a combination thereof. The touch display device according to the first item of the scope of patent application, wherein the anti-glare structure layer includes a plurality of convex structures. As described in the first item of the scope of patent application, the touch display device, wherein the touch electrode layer is formed as a film layer.

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