Touch screen and touch display device

Abstract

The invention relates to the technical field of touch display, and discloses a touch screen which comprises a substrate layer, and a first touch electrode layer, a first insulating layer, a second touch electrode layer, a second insulating layer and a first toning film layer are sequentially arranged on the substrate layer. The first toning film layer comprises high-refractive-index optical dielectric layers and low-refractive-index optical dielectric layers, the total number of the high-refractive-index optical dielectric layers and the low-refractive-index optical dielectric layers is two or more, the thickness of the first toning film layer is 60 nm or above, the toning film is arranged on the touch electrode layer, and the proper toning film thickness is selected, so that the toning effect of the touch screen is improved. By means of coherent cancellation of reflected light, the effects of reducing the reflectivity and adjusting the reflection chromaticity are achieved, the reflectivity and the reflection chromaticity of different areas are closer, and therefore the good integrated black effect is achieved. The invention further discloses a touch display device comprising the touch screen. The visual area and the frame area of the touch display device have a good integrated black effect in a screen turn-off state.

Description

Technical Field

[0001] The present invention relates to the field of touch display technology, and in particular to a touch screen and a touch display device. Background Art

[0002] With the huge demand for touch-screen consumer electronic products and the continuous development of touch-screen display technology, organic light-emitting diode displays (OLED displays) are increasingly accepted by consumers and gradually become the mainstream technology in the display industry due to their advantages such as wide viewing angle, high color gamut and low power consumption.

[0003] Since the OLED display is a self-luminous display mode that does not require liquid crystal and upper and lower polarizers, it will have a large reflection of external incident light, which will cause a decrease in contrast and affect the display effect. In order to improve the effect of OLED display on the reflection of external incident light, OLED display generally adds a circular polarizer on the surface. By setting the circular polarizer, the reflected light after the external incident light enters the OLED display will not be seen by the human eye through the polarizing layer, thereby reducing the reflection of the external incident light. Since the circular polarizer has different reflectivities for light in different wavelength ranges, the reflected light after the external incident light passes through the circular polarizer has a certain color, usually blue. In this way, after the mainstream metal grid touch module is attached, the display colors of the border area (BM area) and the display area (VA area) are inconsistent, which is obviously visible to the naked eye when the screen is off, and the effect of the display area and the border area being black as one cannot be achieved. Summary of the invention

[0004] The present invention aims to solve at least one of the problems in the background technology. To this end, the present invention provides a touch screen and a touch display device, which has a good integrated black effect when the screen is turned off.

[0005] A touch screen according to an embodiment of the first aspect of the present invention includes a substrate layer, on which a first touch electrode layer, a first insulating layer, a second touch electrode layer, a second insulating layer and a first color-adjusting film layer are sequentially arranged, the first color-adjusting film layer including a high-refractive index optical medium layer and a low-refractive index optical medium layer, the total number of layers of the high-refractive index optical medium layer and the low-refractive index optical medium layer is 2 or more, and the thickness of the first color-adjusting film layer is above 60nm. This scheme arranges a color-adjusting film on the touch electrode layer and selects a suitable color-adjusting film thickness, and utilizes the coherent decomposition principle of reflected light to achieve the effect of reducing reflectivity and adjusting reflection chromaticity, so that the reflectivity and reflection chromaticity of different areas are closer, thereby achieving a good integrated black effect when the screen is off.

[0006] According to another embodiment of the present invention, the refractive index of the high refractive index optical medium layer is 1.8 - 2.3, and the refractive index of the low refractive index optical medium layer is 1.4 - 1.6.

[0007] According to another embodiment of the present invention, the thickness of a single layer of the high refractive index optical medium layer is 10 - 30 nm, and the thickness of a single layer of the low refractive index optical medium layer is 50 - 90 nm.

[0008] According to another embodiment of the present invention, the high refractive index optical medium layer is any one of niobium oxide, titanium oxide, silicon nitride and silicon oxynitride.

[0009] According to another embodiment of the present invention, the low refractive index optical medium layer is silicon oxide.

[0010] According to another embodiment of the present invention, the first touch electrode layer is a metal mesh layer. The first touch electrode layer includes a first touch electrode, and a first blackening layer and a first protective layer are sequentially arranged on the first touch electrode.

[0011] According to another embodiment of the present invention, the second touch electrode layer is a metal mesh layer. The second touch electrode layer includes a second touch electrode, and a second blackening layer and a second protective layer are sequentially arranged on the second touch electrode.

[0012] A touch display device according to an embodiment of the second aspect of the present invention includes a visible area and a border area, and is characterized by including a display module and a touch screen, and the touch screen is the touch screen described in any one of the above.

[0013] According to another embodiment of the present invention, a second color adjustment film layer is arranged between the display module and the touch screen. The second color adjustment film layer includes a high refractive index optical medium layer and a low refractive index optical medium layer. The total number of layers of the high refractive index optical medium layer and the low refractive index optical medium layer is 2 layers or more, and the thickness of the first color adjustment film layer is above 60 nm.

[0014] According to another embodiment of the present invention, the display module and the touch screen are connected by an optical adhesive layer.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] A touch screen according to an embodiment of the present invention includes a substrate layer, on which a first touch electrode layer, a first insulating layer, a second touch electrode layer, a second insulating layer, and a first color adjustment film layer are sequentially provided. The first color adjustment film layer includes a high refractive index optical medium layer and a low refractive index optical medium layer, and the total number of layers of the high refractive index optical medium layer and the low refractive index optical medium layer is 2 or more. The thickness of the first color adjustment film layer is above 60 nm. In this solution, by providing a color adjustment film on the touch electrode layer and selecting an appropriate thickness of the color adjustment film, and using the principle of coherent cancellation of reflected light, the effects of reducing the reflectivity and adjusting the reflection chromaticity are achieved, so that the reflectivity and reflection chromaticity in different regions are closer, thereby realizing a good integrated black effect in the off-screen state.

[0017] The present invention discloses an additional aspect and advantages of the present invention will be given in part in the following description, and part will become apparent from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are only used to illustrate the embodiments and are not considered as limitations of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0019] Figure 1 is a schematic cross-sectional view of an embodiment of the touch screen provided by the present application;

[0020] Figure 2 is a schematic cross-sectional view of an embodiment of the first color adjustment film layer of the touch screen provided by the present application;

[0021] Figure 3 is a schematic cross-sectional view of an embodiment of the touch display device provided by the present application;

[0022] Figure 4 is a schematic cross-sectional view of another embodiment of the touch display device provided by the present application;

[0023] Figure 5 is a schematic cross-sectional view of yet another embodiment of the touch display device provided by the present application;

[0024] Figure 6 is a table of reflectivity chromaticity and calculated color difference before and after optimization of an embodiment of the touch display device provided by the present application;

[0025] Figure 7 is a comparison chart of reflectivity curves before and after optimization of an embodiment of the touch display device provided by the present application;

[0026] The meanings of the marks in the figure are:

[0027] 10. Touch display device; 101. Visible area; 102. Border area;

[0028] 100. Touch screen;

[0029] 110. Substrate layer; 120. First touch electrode layer; 130. First insulating layer;

[0030] 140. Second touch electrode layer; 150. Second insulating layer; 160. First color adjustment film layer;

[0031] 161. High refractive index optical medium layer; 162. Low refractive index optical medium layer;

[0032] 200. Display module;

[0033] 210. Second color adjustment film layer; 220. Optical adhesive layer. Detailed implementation manners

[0034] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0035] In the description of the present invention, it should be understood that the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific situations.

[0037] To illustrate the touch screen and the touch display device provided in the present application, the following will be elaborated in detail in combination with the text description of the specification drawings and the embodiments.

[0038] The following refers to Figure 1 and Figure 2 to describe a touch screen 100 according to an embodiment of the first aspect of the present invention, as shown in Figure 1 and Figure 2As shown in the figure, the touch screen 100 includes a substrate layer 110. A first touch electrode layer 120, a first insulating layer 130, a second touch electrode layer 140, a second insulating layer 150, and a first color-tuning film layer 160 are sequentially disposed on the substrate layer 110. Specifically, the first color-tuning film layer 160 includes a high refractive index optical medium layer 161 and a low refractive index optical medium layer 162. The total number of layers of the high refractive index optical medium layer 161 and the low refractive index optical medium layer 162 is 2 or more. Preferably, in order to achieve the corresponding optical effect without increasing the overall thickness and facilitate production and manufacturing, the number of layers of both the high refractive index optical medium layer 161 and the low refractive index optical medium layer 162 is 1. The thickness of the first color-tuning film layer 160 is above 60 nm. By disposing the first color-tuning film layer 160 on the touch electrode layer and selecting an appropriate thickness of the first color-tuning film layer 160, and using the principle of destructive interference of reflected light, the effects of reducing the reflectivity and adjusting the reflection chromaticity are achieved, making the reflectivity and reflection chromaticity of different regions closer, so as to achieve a good integrated black effect in the off-screen state.

[0039] It should be noted that the total number of layers of the high refractive index optical medium layer 161 and the low refractive index optical medium layer 162 is greater than or equal to 2. That is to say, the first color-tuning film layer 160 includes at least one high refractive index optical medium layer 161 and one low refractive index optical medium layer 162. The first color-tuning film layer 160 can be composed of a total of 2 or more layers of high refractive index optical medium layer 161 and low refractive index optical medium layer 162. For example, the first color-tuning film layer 160 includes 1 layer of high refractive index optical medium layer 161 and 1 layer of low refractive index optical medium layer 162. Or, the first color-tuning film layer 160 includes 2 layers of high refractive index optical medium layer 161 and 1 layer of low refractive index optical medium layer 162. Or, the first color-tuning film layer 160 includes 2 layers of high refractive index optical medium layer 161 and 2 layers of low refractive index optical medium layer 162. Or, the first color-tuning film layer 160 includes 2 layers of high refractive index optical medium layer 161 and 3 layers of low refractive index optical medium layer 162. Or, the first color-tuning film layer 160 includes 3 layers of high refractive index optical medium layer 161 and 3 layers of low refractive index optical medium layer 162. Or, the first color-tuning film layer 160 includes 3 layers of high refractive index optical medium layer 161 and 4 layers of low refractive index optical medium layer 162. It can be understood that the number of layers of the high refractive index optical medium layer 161 and the low refractive index optical medium layer 162 can be determined according to different usage scenarios and will not be specifically limited here.

[0040] It should be noted that when the first color-tuning film layer 160 includes multiple layers of high refractive index optical medium layers 161 and / or multiple layers of low refractive index optical medium layers 162, the thickness of each high refractive index optical medium layer 161 can be the same or different, and / or the thickness of each low refractive index optical medium layer 162 can be the same or different. Preferably, for the convenience of production, processing and manufacturing, the thickness of each high refractive index optical medium layer 161 is the same, and the thickness of each low refractive index optical medium layer 162 is the same.

[0041] It should be noted that the first color-tuning film layer 160 can be a continuous film layer, or the first color-tuning film layer 160 can be composed of multiple discontinuous and separate parts. It can be understood that the shape and specific composition of the first color-tuning film layer 160 can be determined according to different usage scenarios, and no specific limitation is made here.

[0042] It should be noted that the substrate layer 110, as the touch unit bearing layer, can also be used as the protective layer of the touch display device 10 after the touch screen 100 and the display module 200 are bonded. Specifically, the substrate layer 110 can be made of transparent glass, or can be made of flexible materials such as polymethyl methacrylate (PMMA), OPC, polyethylene terephthalate (PET), etc.

[0043] It should be noted that the first touch electrode layer 120 and the second touch electrode layer 140 can adopt a vacuum deposition method to deposit conductive materials such as Al, Cu, Al or Cu, and form a touch circuit pattern through photolithography and wet chemical etching, so as to realize the touch function.

[0044] It should be noted that the first insulating layer 130 and the second insulating layer 150 can adopt a polymer insulating material. After coating by spin coating or blade coating, etc., the corresponding first insulating layer 130 and second insulating layer 150 are formed through photolithography and development.

[0045] According to an embodiment of the present invention, as Figure 1 and Figure 2 shown, the refractive index of the high refractive index optical medium layer 161 is 1.8 - 2.3, and the refractive index of the low refractive index optical medium layer 162 is 1.4 - 1.6. It can be understood that the reason for selecting this refractive index range is to match the commonly used optical film materials in the sputtering process and the optical matching based on the principle of reflection coherent cancellation, which can reduce reflection and adjust the reflection chromaticity to achieve the effect of integrated black in different regions.

[0046] It should be noted that when the number of layers of the high refractive index optical medium layer 161 and / or the low refractive index optical medium layer 162 is greater than 1, the refractive index of each layer of the high refractive index optical medium layer 161 and / or the low refractive index optical medium layer 162 should meet the above refractive index requirements. That is to say, the refractive index of each layer of the high refractive index optical medium layer 161 is 1.8 - 2.3, and the refractive index of each layer of the low refractive index optical medium layer 162 is 1.4 - 1.6.

[0047] According to an embodiment of the present invention, as Figure 1 and Figure 2 shown, the thickness of the single-layer high refractive index optical medium layer 161 is 10 - 30 nm, and the thickness of the single-layer low refractive index optical medium layer 162 is 50 - 90 nm. It can be understood that the reason for selecting this thickness range is to match the commonly used optical film materials in the sputtering process and the optical matching based on the principle of destructive interference of reflection, which can reduce reflection and adjust the reflection chromaticity to achieve the effect of integrated black in different regions.

[0048] According to an embodiment of the present invention, as Figure 1 and Figure 2 shown, the high refractive index optical medium layer 161 is any one of niobium oxide, titanium oxide, silicon nitride, and nitrogen oxides. It can be understood that as long as the corresponding display effect and refractive index effect are satisfied, the high refractive index layer can also be made of other materials.

[0049] According to an embodiment of the present invention, as Figure 1 and Figure 2 shown, the low refractive index optical medium layer 162 is silicon oxide. It can be understood that as long as the corresponding display effect and refractive index effect are satisfied, the low refractive index layer can also be made of other materials.

[0050] According to an embodiment of the present invention, as Figure 1 and Figure 2 shown, the first touch electrode layer 120 is a metal mesh layer. The first touch electrode layer 120 includes a first touch electrode (not shown in the figure). A first blackening layer (not shown in the figure) and a first protective layer (not shown in the figure) are sequentially provided on the first touch electrode. It can be understood that by providing the first blackening layer on the first touch electrode, the metal luster can be weakened and the phenomenon of visible metal mesh can be reduced. At the same time, by providing the first protective layer on the first touch electrode, the overall chemical resistance and reliability can be enhanced.

[0051] According to an embodiment of the present invention, as Figure 1 and Figure 2As shown, the second touch electrode layer 140 is a metal mesh layer. The second touch electrode layer 140 includes second touch electrodes (not shown in the figure). A second blackening layer (not shown in the figure) and a second protective layer (not shown in the figure) are sequentially disposed on the second touch electrodes. It can be understood that by providing the second blackening layer on the second touch electrodes, the metallic luster can be weakened and the phenomenon of visible metal meshes can be reduced. At the same time, by providing the second protective layer on the second touch electrodes, the overall chemical resistance and reliability can be enhanced.

[0052] Next, refer to Figures 3 - 7 to describe a touch display device 10 according to an embodiment of the second aspect of the present invention. As Figures 3 - 5 shown, it includes a visible area 101 and a border area 102. The touch display device 10 includes a display module 200 and a touch screen 100. Specifically, the touch screen 100 includes a substrate layer 110. A first touch electrode layer 120, a first insulating layer 130, a second touch electrode layer 140, a second insulating layer 150, and a first color adjustment film layer 160 are sequentially disposed on the substrate layer 110. Specifically, the first color adjustment film layer 160 includes a high refractive index optical medium layer 161 and a low refractive index optical medium layer 162. The total number of layers of the high refractive index optical medium layer 161 and the low refractive index optical medium layer 162 is 2 or more. The thickness of the first color adjustment film layer 160 is above 60 nm. By providing the first color adjustment film layer 160 on the touch electrode layer and selecting an appropriate thickness of the first color adjustment film layer 160, using the principle of destructive interference of reflected light, the effects of reducing the reflectivity and adjusting the reflection chromaticity are achieved, making the reflectivities and reflection chromaticities of different regions closer, so as to achieve a good integrated black effect in the off-screen state.

[0053] According to an embodiment of the present invention, as Figure 4 and Figure 5 shown, a second color adjustment film layer 210 is disposed between the display module 200 and the touch screen 100. The second color adjustment film layer 210 includes a high refractive index optical medium layer 161 and a low refractive index optical medium layer 162. The total number of layers of the high refractive index optical medium layer 161 and the low refractive index optical medium layer 162 is 2 or more. The thickness of the first color adjustment film layer 160 is above 60 nm. By providing the second color adjustment film layer 210, the principle of destructive interference of reflected light can be further utilized to achieve the effects of reducing the reflectivity and adjusting the reflection chromaticity, making the reflectivities and reflection chromaticities of different regions closer. In an optional embodiment, as Figure 6 and Figure 7 shown, the color difference of the visible area 101 before and after optimization is reduced from 6.68 to 0.63, and the reflectivity of the visible area 101 is reduced after optimization, so as to achieve a good integrated black effect of the visible area 101 and the border area 102 in the off-screen state.

[0054] It should be noted that, in some embodiments, such as Figure 5 shown, only a second color adjustment film layer 210 is provided between the display module 200 and the touch screen 100, and there is no need to provide a first color adjustment film layer 160 in the touch screen 100.

[0055] According to an embodiment of the present invention, as Figures 3 - 5 shown, the display module 200 and the touch screen 100 are connected through an optical adhesive layer 220.

[0056] The above touch screen and touch display device provided by this application are preferred embodiments, and should not be construed as limiting the scope of the rights protection of this application. Those skilled in the art should know that, without departing from the concept of this application, various improvements or replacements can be made, and all improvements or replacements should be within the scope of the rights protection of this application, that is, the scope of the rights protection of this application should be subject to the claims.

[0057] In the case of no conflict, the above embodiments and the features in the embodiments in this article can be combined with each other.

Claims

1. A touch screen, characterized in that, It includes a substrate layer, on which a first touch electrode layer, a first insulating layer, a second touch electrode layer, a second insulating layer and a first color-tuning film layer are sequentially arranged. The first color-tuning film layer includes a high refractive index optical medium layer and a low refractive index optical medium layer. The total number of layers of the high refractive index optical medium layer and the low refractive index optical medium layer is 2 or more, and the thickness of the first color-tuning film layer is above 60 nm.

2. The touch screen according to claim 1, wherein The refractive index of the high refractive index optical medium layer is 1.8 - 2.3, and the refractive index of the low refractive index optical medium layer is 1.4 - 1.

6.

3. The touch screen according to claim 1, characterized in that, The thickness of a single high refractive index optical medium layer is 10 - 30 nm, and the thickness of a single low refractive index optical medium layer is 50 - 90 nm.

4. The touch screen according to claim 1, wherein, The high refractive index optical medium layer is any one of niobium oxide, titanium oxide, silicon nitride and silicon oxynitride.

5. The touch screen according to claim 1, wherein The low refractive index optical medium layer is silicon oxide.

6. The touch screen according to claim 1, wherein, The first touch electrode layer is a metal mesh layer, and the first touch electrode layer includes a first touch electrode. A first blackening layer and a first protective layer are sequentially arranged on the first touch electrode.

7. The touch screen according to claim 1, characterized in that, The second touch electrode layer is a metal mesh layer, and the second touch electrode layer includes a second touch electrode. A second blackening layer and a second protective layer are sequentially arranged on the second touch electrode.

8. A touch display device, comprising a visible area and a border area, characterized in that, It includes a display module and a touch screen, and the touch screen is the touch screen according to any one of claims 1 - 7.

9. The touch display device according to claim 8, wherein, A second color-tuning film layer is arranged between the display module and the touch screen. The second color-tuning film layer includes a high refractive index optical medium layer and a low refractive index optical medium layer. The total number of layers of the high refractive index optical medium layer and the low refractive index optical medium layer is 2 or more, and the thickness of the first color-tuning film layer is above 60 nm.

10. The touch display device according to claim 8, wherein, The display module and the touch screen are connected through an optical adhesive layer.

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