TWI589915B - Cover lens and method for fabricating the same - Google Patents

Description

Protective cover and manufacturing method thereof

The present invention relates to a protective cover and a method of making the same.

In recent years, display devices have been widely used in various electronic products as an interface for information display. A light shielding layer is often disposed in the display device to shield the peripheral lines. In order to enhance the visual effect, an anti-reflection layer is often disposed outside the display device to reduce the image quality of the ambient light. In use, the characteristics of the anti-reflection layer are often designed according to the requirements of image quality, that is, the anti-reflection layer is designed to match the visible area of the display device, and these anti-reflection layers tend to have a large anti-reflection effect.

In order to make the non-visible area also have an anti-reflection effect, however, since the non-visible area defined by the light-shielding layer has a low brightness, the anti-reflection layer having a large anti-reflection capability is not the most suitable for the non-visible area. In other words, the anti-reflection layer with high anti-reflection capability applicable to the visible area is disposed in the non-visible area, and the human eye still easily observes a poor visual appearance effect in the non-visible area, for example, the light shielding layer cannot be presented. The original true color causes a problem of a heterochromatic color, thereby affecting the appearance of the display device.

Embodiments of the present invention provide a protective cover plate. By changing the layer properties on the non-visible area, the layer body located in the non-visible area has low reflectance (reflectance less than 2.5%), and the light shielding layer is located The non-visible area has an anti-reflection effect, and the anti-reflection effect of the layer body in the non-visible area in visible light is nearly uniform (the reflectance difference is less than 2%), so that the light-shielding layer can present its true color and reduce the problem of different colors. .

According to some embodiments of the present invention, the protective cover comprises a substrate, a light shielding layer, and a first layer stack. The substrate has opposite first and second surfaces. The light shielding layer is disposed on the first surface of the substrate, wherein the light shielding layer has a light shielding layer opening to define the visible area and the non-visible area of the substrate. The first layer stack is disposed on the second surface of the substrate and at least in the non-visible area. The difference in reflectance of the first layer stack in the visible wavelength range is less than 2%, and the reflectivity of the first layer stack in the non-visible region in the visible wavelength range is less than 2.5%.

In various embodiments of the invention, the first layer stack comprises a first index of refraction layer, wherein the first index of refraction layer has a refractive index ranging from about 1.2 to about 1.8.

In various embodiments of the present invention, the protective cover comprises a second layer stack disposed on the second surface of the substrate and located in the visible region, wherein the first layer stack is connected to the second layer stack, and the second The layer stack is an anti-reflection stack.

In a plurality of embodiments of the present invention, the protective cover plate comprises a second layer stack and a third layer stack disposed on the second surface of the substrate and located in the visible area, wherein the second layer stack is located on the third layer Between the body stack and the substrate, The refractive index of the layer of the two-layer stack adjacent to the third layer stack is greater than the refractive index of the layer of the third layer stack adjacent to the second layer stack.

In various embodiments of the present invention, the third layer stack is the same material as the first layer stack, and the third layer stack is formed in the same process as the first layer stack.

In various embodiments of the invention, the reflectivity of the stacked third layer stack and the second layer stack in the viewable area is less than the reflectivity of the first layer stack in the non-visible area.

In various embodiments of the present invention, the reflectance difference between the stacked third anti-layer stack and the second layer stack at the visible region is less than 1%.

In various embodiments of the invention, the first layer stack has an opening in the viewable area and the second layer stack is located in the opening of the first layer stack.

In various embodiments of the present invention, the second layer stack includes a plurality of third refractive index layers and a fourth refractive index layer, and each of the two third refractive index layers is separated by a fourth refractive index layer, wherein One of the triple refractive index layers abuts the substrate, wherein the refractive index of the third refractive index layer is greater than the refractive index of the fourth refractive index layer and the first refractive index layer of the first layer stack.

In various embodiments of the invention, the third refractive index layer has a refractive index ranging from about 2.2 to about 2.4, and the fourth refractive index layer has a refractive index ranging from about 1.4 to about 1.6.

In various embodiments of the invention, wherein the first layer stack has an opening, located in the viewable area.

In a plurality of embodiments of the present invention, the substrate includes a flat portion and a bent portion disposed on at least one side of the flat portion, wherein the light shielding layer and the first layer body stack are disposed at least on opposite sides of the bent portion, and are bent The part is located in the non-visible area.

In various embodiments of the present invention, the material of one of the first refractive index layers of the first layer stack is magnesium fluoride.

According to some embodiments of the present invention, a method for fabricating a protective cover includes providing a substrate, wherein the substrate has opposite first and second surfaces; forming a light shielding layer on the first surface of the substrate, wherein the light shielding layer has a light shielding layer opening, Defining a visible area and a non-visible area of the substrate; and forming the first layer body on the second surface of the substrate and at least in the non-visible area, wherein the difference in reflectance of the first layer body stacked in the visible wavelength range is less than 2%, And the reflectivity of the first layer stack in the non-visible region in the visible wavelength range is less than 2.5%.

In various embodiments of the present invention, the method for fabricating the protective cover further comprises forming a second layer stacked on the second surface of the substrate and located in the visible region.

In various embodiments of the present invention, the step of forming the second layer body on the second surface of the substrate and in the visible region comprises forming a film on the second surface of the substrate, the film comprising a hollow portion located in the visible region; Forming at least a material on the film, wherein the material covers the film and filling the hollow; and removing the film and the material on the film such that the remaining material forms a second layer stack.

In a plurality of embodiments of the present invention, the method for fabricating the protective cover further comprises forming a third layer body stacked on the second surface of the substrate and located in the visible region, wherein the second layer stack is located in the third layer stack. Between the substrate and the substrate, the layer stack of the second layer stack adjacent to the third layer stack has a refractive index greater than the layer stack of the third layer stack adjacent to the second layer stack.

In various embodiments of the invention, the step of forming the first layer stack is performed simultaneously with the step of forming the third layer stack.

In a plurality of embodiments of the present invention, the substrate includes a flat portion and a bent portion disposed on at least one side of the flat portion, wherein the light shielding layer and the first layer body stack are disposed at least on opposite sides of the bent portion, and are bent The part is located in the non-visible area.

100‧‧‧ protective cover

110‧‧‧Substrate

112‧‧‧flat

114‧‧‧Bends

120‧‧‧ shading layer

122‧‧‧ shading opening

130‧‧‧First layer stacking

130a‧‧‧ bottom

134‧‧‧First refractive index layer

136‧‧‧ openings

140‧‧‧Second layer stacking

140’‧‧‧Materials

140a‧‧‧ bottom

142‧‧‧ Third refractive index layer

144‧‧‧fourth refractive index layer

150‧‧‧Layer 3 stacking

154‧‧‧ fifth refractive index layer

200‧‧‧ film

210‧‧‧镂空部

S1‧‧‧ first surface

S2‧‧‧ second surface

VA‧‧ visible area

NA‧‧‧Invisible area

1A is a cross-sectional view of a protective cover according to an embodiment of the present invention.

FIG. 1B is a refractive index spectrum diagram of a portion of the first layer stack of the protective cover according to some embodiments.

1C is a reflection spectrum diagram of a first layer stack of a protective cover according to some embodiments.

Figure 2 is a cross-sectional view of a protective cover according to another embodiment of the present invention.

Figure 3 is a cross-sectional view of a protective cover according to still another embodiment of the present invention.

Figure 4 is a cross-sectional view of a protective cover according to another embodiment of the present invention.

Figure 5 is a cross-sectional view of a protective cover according to still another embodiment of the present invention.

6A to 6D are cross-sectional views of the protective cover according to an embodiment of the present invention at a plurality of manufacturing stages.

The various embodiments of the present invention are disclosed in the drawings, and in the claims However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified manner.

1A is a cross-sectional view of a protective cover 100 in accordance with an embodiment of the present invention. The protective cover 100 includes a substrate 110, a light shielding layer 120, and a first layer stack 130. The substrate 110 has a first surface S1 and a second surface S2 disposed opposite to each other. When the protective cover 100 is used as an outer cover of the display device, the second surface S2 is closer to the human eye than the first surface S1. The light shielding layer 120 is disposed on the first surface S1 of the substrate 110, wherein the light shielding layer 120 has a light shielding layer opening 122 to define the visible area VA and the non-visible area NA of the substrate 110, wherein the area corresponding to the light shielding layer opening 122 is the visible area VA. The other is the non-visible area NA. The first layer stack 130 is disposed on the second surface S2 of the substrate 110 and at least in the non-visible area NA. The first layer stack 130 located in the non-visible area NA has a reflectance difference of less than 2% corresponding to different wavelengths in the visible light wavelength range, and the reflectivity of the first layer stack 130 in the non-visible area NA in the visible wavelength range is less than 2.5. %.

As used herein, the "reflectance difference" of a material or structure is defined as the difference between the maximum reflectance and the minimum reflectance of the material or structure in the visible wavelength range (between 400 nm and 700 nm). .

In an embodiment, the first layer stack 130 includes a first refraction Rate layer 134. The first refractive index layer 134 is disposed on the second surface S2 of the substrate 110 and located in the non-visible area NA. The refractive index of the first refractive index layer 134 ranges from about 1.2 to about 1.8.

In various embodiments of the present invention, in the non-visible area NA, only the first layer stack 130 having a small difference in reflectance is used, and the reflectance range of the first layer stack 130 is matched. In this way, the non-visible area NA has the anti-reflection effect, and from the visual effect, the color of the light-shielding layer 120 of the non-visible area NA is not changed by the first layer stack 130, and the light-shielding layer can be present. The color of 120 itself can reduce the problem that the light shielding layer 120 is easily observed in the non-visible area NA.

With continued reference to FIG. 1A, in various embodiments of the present invention, the protective cover 100 includes a second layer stack 140 and a third layer stack 150. The second layer stack 140 is disposed on the second surface S2 of the substrate 110 and located in the visible area VA, and the third layer stack 150 is disposed on one side of the second layer stack 140 opposite to the substrate 110, so that the second layer stack is stacked. 140 is located between the third layer stack 150 and the substrate 110.

The second layer stack 140 includes a plurality of third refractive index layers 142 and a fourth refractive index layer 144, and each of the two third refractive index layers 142 is separated by a fourth refractive index layer 144, wherein the third refractive index layer One of the 142s (eg, the third refractive index layer 142 located below the fourth refractive index layer 144 in FIG. 1A) is adjacent to the substrate 110, and the other of the third refractive index layer 142 (eg, the fourth refractive index layer in FIG. 1A) The third refractive index layer 142 above 144 is adjacent to the third layer stack 150. The refractive index of the third refractive index layer 142 is greater than the refractive index of the fourth refractive index layer 144. In some embodiments, the refractive index of the third refractive index layer 142 is greater than the first refractive index. The refractive index of layer 134. Herein, although the second layer stack 140 is illustrated in a three-layer structure, five or seven layers may be employed in practical applications, and the scope of the present invention should not be limited as shown in the drawings.

In some embodiments, the first layer stack 130 is the same material as the third layer stack 150. In various embodiments of the invention, the third layer stack 150 includes a fifth index layer 154. A fifth refractive index layer 154 having a smaller refractive index is used as the outermost layer of the connecting air in the visible region VA to reduce the reflectance of the interface between the air and the layer stack.

Moreover, the refractive index of the third refractive index layer 142 of the second layer stack 140 adjacent to the third layer stack 150 is greater than the refractive index of the fifth layer stack 150 of the second layer stack 150 adjacent to the second layer stack 140. Thereby, the second layer stack 140 and the third layer stack 150 form a laminated relationship of high and low refractive index staggered to maintain the anti-reflection effect of the visible region VA through destructive interference.

Here, in the visible light wavelength range, the first layer stack 130 has a reflectance difference of less than 2% compared to the conventional anti-reflection layer suitable for the visible area VA, and has a relatively uniform anti-reflection effect to reduce non-visuality. The light shielding layer 120 of the area NA has a problem of a different color. The reflectivity of the stacked third layer stack 150 and the second layer stack 140 in the visible region of the visible region is smaller than that of the first layer stack 130 in the non-visible region NA. Preferably, the reflectivity of the stacked third layer stack 150 and the second layer stack 140 in the visible area VA is less than 1%, so that the visible area VA has a better anti-reflection effect.

In the embodiment, in order to improve the process efficiency and achieve a seamless connection between the first layer stack 130 and the second layer stack 140, the first layer stack The 130 and the third layer stack 150 are composed of the same process steps, and the edges of the two layers may be connected to each other as a continuous structure, and the scope of the invention should not be limited thereby. Alternatively, in other embodiments, the first layer stack 130 and the third layer stack 150 may be formed separately, and the two may not be connected to each other, and the materials thereof may be different.

In some embodiments, the first layer stack 130 is adjacent to the second layer stack 140, and the bottom surface 130a of the first layer stack 130 is aligned with the bottom surface 140a of the second layer stack 140 to make the first layer The body stack 130 in combination with the second layer stack 140 may completely cover the second surface S2 of the protective cover 100.

In various embodiments of the invention, the projection of the first layer stack 130 on the substrate 110 completely covers the non-visible area NA, while the second layer stack 140 is not located in the non-visible area NA. Since the reflectivity of the first layer stack 130 is uniform at each wavelength in the visible light wavelength range, the light shielding layer 120 in the non-visible area NA can be reduced from being affected by the first layer stack 130, and the non-visible area NA is reduced. The problem of the light-shielding layer 120 is different. In some embodiments, a portion of the first layer stack 130 is also located in the viewable area VA. In other embodiments, the first layer stack 130 may be located only in the non-visible area NA, not in the viewable area VA.

The following examples illustrate the materials and related properties of each layer stack. It should be understood that the number of materials and layers in each layer stack can be variously modified.

In various embodiments of the present invention, in the first layer stack 130, the material of the first refractive index layer 134 may be magnesium fluoride or a combination thereof. Here, although the first layer stack 130 is illustrated in a single layer structure, the first layer stack 130 may further include other layers on the first index layer 134, such as a ruthenium dioxide layer. In various embodiments of the present invention, in the second layer stack 140, the third refractive index layer 142 has a refractive index ranging from about 2.2 to about 2.4, and the fourth refractive index layer 144 has a refractive index ranging from about 1.4. It is between about 1.6. For example, the material of the third refractive index layer 142 may be titanium oxide (Ti ₃ O ₅ ), tantalum nitride (Si ₃ N ₄ ), niobium oxide (Nb ₂ O ₅ ), and material of the fourth refractive index layer 144. It can be cerium oxide.

Specifically, reference is made to FIG. 1B and FIG. 1C simultaneously. 1B is a refractive index spectrum diagram of a portion of the first layer stack 130 of the protective cover according to some embodiments, and FIG. 1C is a reflection spectrum diagram of the first layer stack 130 of the protective cover 100 according to some embodiments. Herein, the first layer stack 130 is exemplified by a magnesium fluoride layer and a ceria layer stack. In order to better explain the difference in reflectance of the first layer stack, the other curve in FIG. 1C is a conventional anti-reflection. The reflectance spectra of layers such as titanium oxide and ruthenium dioxide are described for comparison. Figure 1B is a refractive index spectrum of the magnesium fluoride layer. Referring to FIG. 1B, the magnesium fluoride layer of the first layer stack 130 has a refractive index value in the visible light of between 1.2 and 1.8 (within the range indicated by the broken line). Referring to FIG. 1C, the difference in reflectance (indicated by thin lines) of the first layer stack 130 in visible light is smaller than the difference in reflectance (indicated by thick lines) of titanium oxide and cerium oxide stacked in visible light, for example, the first in the figure. The difference in reflectivity of the layer stack 130 in visible light is less than 2%. As such, the first layer stack 130 reduces the problem of the color difference of the light shielding layer 120 in the non-visible area NA without sacrificing the image quality of the visible area VA.

In addition, since the third layer stack 150 is the same material as the first layer stack 130 in some embodiments, the fifth index layer 154 may It is the same as the material of the first refractive index layer 134.

In some embodiments of the present invention, the other of the third refractive index layer 142 (eg, the third refractive index layer 142 located above the fourth refractive index layer 144 in FIG. 1A) is adjacent to the fifth refraction of the third layer stack 150. The rate layer 154 is such that in the visible area VA, the second layer stack 140 having a large difference in reflectance and the third layer stack 150 having a small difference in reflectance are combined into a structure in which the refractive index is staggered, and the destructive interference is effective. The ground achieves an anti-reflective effect. In the non-visible area NA, only the first layer stack 130 having a small difference in reflectance is used to reduce the problem that the color difference is easily observed in the non-visible area NA.

2 is a cross-sectional view of a protective cover 100 in accordance with another embodiment of the present invention. This embodiment is similar to the embodiment of FIG. 1A except that in the present embodiment, the substrate 110 includes a flat portion 112 and a bent portion 114 provided on at least one side of the flat portion 112, wherein the light shielding layer 120 and the first layer The body stack 130 is disposed at least on opposite sides of the bent portion 114, and the bent portion 114 is located in the non-visible area NA. The first layer stack 130 covers the bends 114.

As in the foregoing, in the visible region VA, the second layer stack 140 having a large difference in reflectance is combined with the third layer stack 150 having a small difference in reflectance to form a structure in which the refractive index is staggered, and the refractive index is low. The fifth refractive index layer 154 serves as the outermost layer and can effectively achieve an antireflection effect. In the non-visible area NA, especially when the light shielding layer 120 is further disposed on the bent portion 114, if the conventional anti-reflection layer applicable only to the visible area VA is directly disposed on the bent portion 114, and located On the opposite side of the light shielding layer 120, on the one hand, the surface of the antireflection layer may be uneven in thickness due to the curved surface coating, thereby causing the light shielding layer of the curved surface region to be different in color. On the other hand, anti-reflection that achieves anti-reflection by using the principle of interference Because of the existence of the curved surface and the large incident angle, the layer may make the reflected light unable to interfere smoothly, and thus cannot operate normally, which may easily cause corresponding appearance defects such as different colors of the light shielding layer in the curved surface region. Therefore, the anti-reflection layer suitable for the visible area VA is no longer suitable for the bent portion 114, and the original color of the light shielding layer 120 cannot be truly presented. The present invention covers the non-visible area NA by using the first layer stack 130 having a small difference in reflectance. By this arrangement, the occurrence of the problem of the color difference of the light-shielding layer 120 can be easily observed on the bent portion 114 of the non-visible area NA.

Other details of the present embodiment are substantially as described in the embodiment of FIG. 1A, and are not described herein again.

Figure 3 is a cross-sectional view of a protective cover 100 in accordance with still another embodiment of the present invention. This embodiment is similar to the embodiment of FIG. 1A. The difference is that in the embodiment, the protective cover 100 does not include the third layer stack 150, and the second layer stack 140 is a multi-layer high-low refractive index anti-reflection stack. . Here, the first layer stack 130 has an opening 136 located in the visible area VA. The second layer stack 140 is located within the opening 136 of the first layer stack 130. The first layer stack 130 in combination with the second layer stack 140 covers the non-visible area NA and the visible area VA.

In the present embodiment, the second layer stack 140 includes a plurality of third refractive index layers 142 and a plurality of fourth refractive index layers 144, and the third refractive index layer 142 and the fourth refractive index layer 144 are staggered with each other. The refractive index of the third refractive index layer 142 is greater than the refractive index of the fourth refractive index layer 144. Here, the fourth refractive index layer 144 having a smaller refractive index is used as the outermost layer of the connected air to lower the reflectance.

In the present embodiment, the anti-reflection effect is achieved by the second layer stack 140 in the visible area VA. In the non-visible area NA, only the reverse is used. The first layer stack 130 having a lower reflectance difference than the second layer stack 140 reduces the problem of easily observing discoloration on the non-visible area NA. Other details of the present embodiment are substantially as described in the embodiment of FIG. 1A, and are not described herein again.

Figure 4 is a cross-sectional view of a protective cover 100 in accordance with another embodiment of the present invention. The embodiment is similar to the embodiment of FIG. 1A . The difference is that in the embodiment, the protective cover 100 includes only the first layer stack 130 and does not include the third layer stack 150 and the second layer stack 140 (refer to Figure 1A). The first layer stack 130 has an opening 136 located within the viewable area VA.

In this embodiment, no layer stack is used in the visible area VA. In the non-visible area NA, only the first layer stack 130 having a small difference in reflectance is used to reduce the problem that the color difference is easily observed on the light shielding layer 120. Other details of the present embodiment are substantially as described in the embodiment of FIG. 1A, and are not described herein again.

Figure 5 is a cross-sectional view of a protective cover 100 in accordance with yet another embodiment of the present invention. This embodiment is similar to the embodiment of FIG. 4 except that in the present embodiment, the substrate 110 includes a flat portion 112 and a bent portion 114 provided on at least one side of the flat portion 112, wherein the light shielding layer 120 and the first layer The body stack 130 is disposed at least on opposite sides of the bent portion 114, and the bent portion 114 is located in the non-visible area NA. The first layer stack 130 covers the bends 114.

In this embodiment, no layer stack is used in the visible area VA. In the non-visible area NA, only the first layer stack 130 having a small difference in reflectance is used to reduce the problem that the color difference is easily observed on the bent portion 114 of the non-visible area NA. Other details of the present embodiment are substantially as described in the embodiment of FIG. 1A, and are not described herein again.

6A through 6D are cross-sectional views of the protective cover 100 in various stages of manufacture in accordance with an embodiment of the present invention. The following manufacturing process may correspond to the protective cover 100 of the embodiment shown in FIG. 2, and the protective cover forming step of other embodiments may be substantially the same.

First, referring to FIG. 6A, a substrate 110 is provided and a light shielding layer 120 is formed thereon. The substrate 110 includes a flat portion 112 and a bent portion 114 disposed on at least one side of the flat portion 112, and the substrate 110 has a first surface S1 and a second surface S2 disposed opposite to each other. The light shielding layer 120 is formed on the first surface S1 of the substrate 110 and located on the bent portion 114. In this embodiment, the light shielding layer 120 is further located on the flat portion 112. In the present embodiment, the light shielding layer 120 has a light shielding layer opening 122 to define a visible area VA and a non-visible area NA of the substrate 110. The bent portion 114 is located in the non-visible area NA. Here, a film 200 is also formed on the second surface S2 of the substrate 110, wherein the film 200 includes a hollow portion 210 located in the visible region VA.

In the present embodiment, the film 200 may be a flexible film substrate having a release property to facilitate peeling of the film 200 at one time. The film 200 can be in direct contact with the substrate 110 and adhered to the bent portion 114 by its release ability. Alternatively, the coating film 200 may be formed by applying a liquid colloid to the bent portion 114 and then curing or baking. The material of the film 200 may be a material that can be peeled off at one time after curing. For example, the film 200 may be a resin. In the present embodiment, the relationship between the light shielding layer opening 122 and the coating film 200 may be various other variations. However, in general, the orthographic projection of the hollow portion 210 on the substrate 110 is located within the opening of the light shielding layer 122 or is open to the light shielding layer. 122 is roughly the same.

In other embodiments, the material of the film 200 may be a photoresist. By providing a photoresist layer on the second surface S2, and using the light shielding layer 120 as light The hood passes the light through the light shielding layer opening 122 of the light shielding layer 120 to expose the photoresist layer, and after development, removes the exposed photoresist layer by wet stripping or dry stripping, etc., so that the remaining The photoresist layer is used as the film 200. In some embodiments, since the light shielding layer 120 serves as a mask for the photoresist layer exposure process, the hollow portion 210 and the light shielding layer opening 122 of the light shielding layer 120 have substantially the same pattern, that is, the light shielding layer opening 122 and the coating film 200 are hollowed out. The projected shape and area of the portion 210 on the substrate 110 are the same.

Next, referring to Fig. 6B, at least one material 140' is formed on the film 200, wherein the material 140' covers the film 200 and is filled in the hollow portion 210. In various embodiments of the present invention, a plurality of materials may be layered into the hollow portion 210 by deposition, coating, or the like to form a plurality of layer bodies, so that the material 140' may include a plurality of layer bodies. For example, a titanium oxide layer and a hafnium oxide layer.

Referring to FIG. 6C, the film 200 and the material 140' on the film 200 are removed, so that the remaining material 140' (refer to FIG. 6B) forms a second layer stack 140, and the second layer stack 140 is located on the substrate 110. The second surface S2 is located within the viewable area VA.

Then, referring to FIG. 6D, the first layer body stack 130 and the third layer body stack 150 are formed on the second surface S2 of the substrate 110. Here, in the same manner, the first layer stack 130 and the third layer stack 150 may be formed by deposition, coating, or the like. The first layer stack 130 is located at least in the non-visible area NA, and the third layer stack 150 is located in the viewable area VA. In various embodiments of the invention, the step of forming the first layer stack 130 and the step of forming the third layer stack 150 may be performed simultaneously. The material and manufacturing process of the third layer stack 150 and the respective layer bodies of the first layer stack 130 are substantially the same.

In the various embodiments of the present invention, the light shielding layer 120 and the first layer stack 130 are disposed at least on opposite sides of the bent portion 114, and the second layer stack 140 is not disposed in the non-visible area NA. As previously mentioned, the second layer stack 140 may have a higher reflectivity than the third layer stack 150, while the first layer stack 130 has a lower reflectance difference configuration than the second layer stack 140. The difference in rates is used to improve the aforementioned heterochromatic problem without sacrificing quality.

In various embodiments of the present invention, the third layer stack 150 is formed thereon after the formation of the second layer stack 140 such that the second layer stack 140 is located on the third layer stack 150 and the substrate 110. between. Here, the first layer stack 130 and the second layer stack 140 are directly disposed on the substrate 110, and the first layer stack 130 is adjacent to the second layer stack 140, and the first layer stack 130 is The bottom surface 130a is aligned with the bottom surface 140a of the second layer stack 140.

Here, the first layer stack 130 and the third layer stack 150 may include a plurality of layers, such as a ruthenium oxide layer and a magnesium fluoride layer. Here, in order to facilitate the description of the process steps, the layer bodies in the respective layer stacks are not shown in detail. For the detailed structure of each layer stack in the present embodiment, reference may be made to the structure of the embodiment of FIG. 2, and details are not described herein again. .

In some embodiments, the third layer stack 150 is not necessarily configured, and the third layer stack 150 may be removed or omitted by an etching process or other methods. Other details of the present embodiment are substantially as described in the embodiment of FIG. 2 and will not be described herein.

Embodiments of the present invention provide a protective cover that has a low layer body in the non-visible area by changing the layer properties on the non-visible area The reflectance (reflectance is less than 2.5%), and the non-visible area where the light shielding layer is located has an anti-reflection effect, and the anti-reflection effect of the layer body in the non-visible area in visible light is nearly uniform (the reflectance difference is less than 2%) . In this way, the problem of the difference in the reflectance of the layer of the non-visible area on the light-shielding layer and the color difference of the light-shielding layer can be reduced without sacrificing the image quality of the visible area.

While the invention has been described above in terms of various embodiments, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application attached.

100‧‧‧ protective cover

110‧‧‧Substrate

120‧‧‧ shading layer

122‧‧‧ shading opening

130‧‧‧First layer stacking

130a‧‧‧ bottom

134‧‧‧First refractive index layer

140‧‧‧Second layer stacking

140a‧‧‧ bottom

142‧‧‧ Third refractive index layer

144‧‧‧fourth refractive index layer

150‧‧‧Layer 3 stacking

154‧‧‧ fifth refractive index layer

S1‧‧‧ first surface

S2‧‧‧ second surface

VA‧‧ visible area

NA‧‧‧Invisible area

Claims (17)

A protective cover comprising: a substrate having a first surface and a second surface disposed oppositely; a light shielding layer disposed on the first surface of the substrate, wherein the light shielding layer has a light shielding layer opening to define a visible area of the substrate and a non-visible area; a first layer stack is disposed on the second surface of the substrate and at least in the non-visible area, the first layer is stacked in a visible wavelength range corresponding to different wavelengths The difference in reflectance is less than 2%, the reflectivity of the first layer stack in the visible light wavelength range is less than 2.5%; and a second layer stack is disposed on the second surface of the substrate and located in the visible In the area, the first layer stack is connected to the second layer stack, and the second layer stack is an anti-reflection stack. The protective cover of claim 1, wherein the first layer stack comprises: a first refractive index layer, wherein the first refractive index layer has a refractive index ranging from about 1.2 to about 1.8. The protective cover of claim 1, further comprising a third layer stack disposed on the second surface of the substrate and located in the visible area, wherein the second layer stack is located in the third layer stack Between the substrate and the substrate, a layer of the second layer stack adjacent to the third layer stack has a refractive index greater than a refractive index of the layer stack adjacent to the second layer stack. The protective cover of claim 3, wherein the third layer stack is the same material as the first layer stack, and the third layer stack is formed in the same process as the first layer stack. The protective cover of claim 3, wherein a reflectivity of the stacked third layer stack and the second layer stack in the visible area is smaller than a reflectivity of the first layer stack in the non-visible area . The protective cover of claim 5, wherein the stack of the third layer stack and the second layer stack located in the visible region have a reflectance of less than 1% in a visible wavelength range. The protective cover of claim 1, wherein the first layer stack has an opening in the visible area, and the second layer stack is located in the opening of the first layer stack. The protective cover of claim 1, wherein the second layer stack comprises: a plurality of third refractive index layers; and at least a fourth refractive index layer, wherein each of the two third refractive index layers is The fourth refractive index layer is spaced apart, wherein one of the third refractive index layers is adjacent to the substrate, wherein a refractive index of the third refractive index layer is greater than a fourth of the fourth refractive index layer and the first layer stack The refractive index of a refractive index layer. The protective cover of claim 8, wherein the third refractive index layer has a refractive index ranging from about 2.2 to about 2.4, and the fourth refractive index layer has a refractive index ranging from about 1.4 to about 1.6. . The protective cover of any one of claims 1 to 9, wherein the substrate comprises a flat portion and a bent portion disposed on at least one side of the flat portion, wherein the light shielding layer is stacked with the first layer body At least two opposite sides of the bent portion are disposed, and the bent portion is located in the non-visible area. The protective cover of claim 1, wherein a material of the first refractive index layer of the first layer stack is magnesium fluoride. A method for manufacturing a protective cover, comprising: providing a substrate, wherein the substrate has a first surface and a second surface disposed oppositely; forming a light shielding layer on the first surface of the substrate, wherein the light shielding layer has a a light shielding layer opening to define a visible area and a non-visible area of the substrate; forming a first layer body stacked on the second surface of the substrate and at least in the non-visible area, wherein the first layer body is stacked on visible light wavelength The difference in reflectance within the range is less than 2%, and the reflectivity of the first layer stack in the visible light wavelength range of the non-visible region is less than 2.5%; and a second layer body is formed on the second surface of the substrate and Located in the viewable area. The method of manufacturing the protective cover of claim 12, wherein the step of forming the second layer on the second surface of the substrate and located in the visible region comprises: forming a film on the substrate a second surface, the coating comprising a hollow portion located in the visible region; forming at least one material on the coating, wherein the material covers the coating and filling the hollow portion; and removing the coating and being located on the coating The material on the film causes the remaining material to form the second layer stack. The method of manufacturing the protective cover of claim 12, further comprising: forming a third layer stack on the second surface of the substrate and located in the visible area, wherein the second layer stack is located in the first layer Between the three-layer body stack and the substrate, the refractive index of the layer body adjacent to the third layer body stack of the second layer body stack is greater than the refractive index of the layer body of the third layer body stack adjacent to the second layer body stack. The method of fabricating a protective cover according to claim 14, wherein the step of forming the first layer stack is performed simultaneously with the step of forming the third layer stack. The method of manufacturing a protective cover according to any one of claims 13 to 15, wherein the substrate comprises a flat portion and is disposed on the flat portion a bent portion of the at least one side, wherein the light shielding layer and the first layer body stack are disposed at least on opposite sides of the bent portion, and the bent portion is located in the non-visible portion. A protective cover, comprising: a substrate comprising a flat portion and a bent portion disposed on at least one side of the flat portion, wherein the substrate has a first surface and a second surface disposed opposite to each other; a light shielding layer Provided on the first surface of the substrate, wherein the light shielding layer has a light shielding layer opening to define a visible area and a non-visible area of the substrate, wherein the bending portion is located in the non-visible area; and a first layer The body stack is disposed on the second surface of the substrate and at least in the non-visible area, wherein the light shielding layer and the first layer body stack are disposed at least on opposite sides of the bent portion, and the first layer body stack has a An opening located in the visible region, wherein the first layer body is stacked in a visible light wavelength range, and the difference in reflectance corresponding to different wavelengths is less than 2%, and the reflectivity of the first layer body stack in the visible light wavelength range of the non-visible region is less than 2.5%.