TW202343032A - Cover plate device - Google Patents

Abstract

A cover plate device is provided, which comprises: a substrate; and an optical film disposed on the substrate, wherein the optical film comprises a first film and a second film, and the first film is disposed on the second film; wherein at a wavelength of 550nm, a refractive index of the first film is different from a refractive index of the second film, and the second film comprises a metal oxide.

Description

cover device

The present disclosure provides a cover device, particularly a cover device including optical film layers with different refractive indexes.

As technology continues to advance and in order to adapt to users' usage habits, display devices still need to continue to be improved. Currently, when display devices are used outdoors or under conditions with strong ambient light, there are still problems such as excessive reflected light causing visual interference or reduced contrast, or when the display device is in a dark state, there is an obvious boundary between the frame and the display panel, etc. Aesthetic issues.

Traditionally, the effect of reducing reflected light can be achieved by coating a layer of anti-reflective film on the cover surface of the display device, or the cover can be dyed to improve the aesthetics. However, traditional methods still have problems such as complicated preparation processes and poor contrast or anti-reflection effects.

Therefore, there is an urgent need to develop a cover device to improve the conventional defects.

The present disclosure provides a cover device, including: a substrate; and an optical film layer disposed on the substrate, wherein the optical film layer includes a first film layer and a second film layer, and the first film layer is provided On the second film layer; wherein, at an optical wavelength of 550 nm, the refractive index of the first film layer is different from the refractive index of the second film layer, and the second film layer includes a metal oxide.

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numbers are used in the drawings and descriptions to refer to the same or similar parts.

Throughout this disclosure and the appended claims, certain terms are used to refer to specific components. Those skilled in the art will appreciate that manufacturers of electronic devices may refer to the same component by different names. This article is not intended to differentiate between components that have the same functionality but have different names. In the following description and patent application, the words "including" and "include" are open-ended words, so they should be interpreted to mean "including but not limited to...".

The directional terms mentioned in this article, such as "up", "down", "front", "back", "left", "right", etc., are only for reference to the directions in the accompanying drawings. Accordingly, the directional terms used are illustrative and not limiting of the disclosure. In the drawings, each figure illustrates the general features of methods, structures, and/or materials used in particular embodiments. However, these drawings should not be interpreted as defining or limiting the scope or nature encompassed by these embodiments. For example, the relative sizes, thicknesses, and locations of various layers, regions, and/or structures may be reduced or exaggerated for clarity.

When a structure (or layer, component, or substrate) described in this disclosure is located on/above another structure (or layer, component, or substrate), it may mean that the two structures are adjacent and directly connected, or they may Refers to the fact that two structures are adjacent rather than directly connected. Indirect connection means that there is at least one intermediary structure (or intermediary layer, intermediary component, intermediary substrate, or intermediary spacer) between two structures. The lower surface of one structure is adjacent to or directly connected to the upper surface of the intermediary structure, and the other is adjacent to or directly connected to the upper surface of the intermediary structure. The upper surface of a structure is adjacent to or directly connected to the lower surface of the intermediate structure. The intermediary structure can be composed of a single-layer or multi-layer physical structure or a non-physical structure, and there is no limit. In this disclosure, when a structure is disposed "on" another structure, it may mean that the structure is "directly" on the other structure, or that the structure is "indirectly" on the other structure, that is, between the structure and the other structure. At least one structure is also sandwiched.

The terms "about", "equal to", "equal" or "the same", "substantially" or "substantially" are generally interpreted to mean within 20% of a given value or range, or to mean within a given value or range. Within 10%, 5%, 3%, 2%, 1% or 0.5% of the value or range.

The ordinal numbers used in the specification and the scope of the patent application, such as "first", "second", etc., are used to modify elements. They themselves do not imply and represent that the element (or elements) have any previous ordinal number, nor do they mean that the element (or elements) has any previous ordinal number. It does not represent the order of one element with another element, or the order of the manufacturing method. The use of these numbers is only used to clearly distinguish an element with a certain name from another element with the same name. The same words may not be used in the patent application scope and the description. Accordingly, the first component in the description may be the second component in the patent application scope.

In the present disclosure, the thickness can be measured by using an optical microscope, and the thickness can be measured by cross-sectional images in an electron microscope, but it is not limited to this. In addition, any two values or directions used for comparison may have certain errors. In addition, the terms "equal to", "equal to", "the same", "substantially" or "substantially" mentioned in this disclosure generally mean falling within 10% of a given value or range. In addition, the terms "the given range is the first value to the second value" and "the given range falls within the range of the first value to the second value" mean that the given range includes the first value, the second value and their other values in between.

It should be noted that the following embodiments can be replaced, reorganized, and mixed with features of several different embodiments without departing from the spirit of the present disclosure to complete other embodiments. Features in various embodiments may be mixed and matched as long as they do not violate the spirit of the invention or conflict with each other.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It is understood that these terms, such as those defined in commonly used dictionaries, should be interpreted to have a meaning consistent with the relevant technology and the background or context of the present disclosure, and should not be interpreted in an idealized or overly formal manner. Unless otherwise defined in the embodiments of this disclosure.

FIG. 1A is a schematic diagram of a cover device according to an embodiment of the present disclosure. FIG. 1B is a schematic diagram of an optical film layer according to an embodiment of the present disclosure.

As shown in FIGS. 1A and 1B , the cover device 100 of the present disclosure may include: a substrate 1; and an optical film layer 2 disposed on the substrate 1, where the optical film layer 2 includes a first film layer 21 and A second film layer 22, the first film layer 21 is disposed on the second film layer 22; wherein, at an optical wavelength of 550 nm, the refractive index of the first film layer 21 is different from the refractive index of the second film layer 22. Through the stacked design of film layers with different refractive indexes, the optical film layer 2 can achieve the effect of reducing reflected light. When the cover device 100 including the optical film layer 2 is applied to a display device, the contrast or optical quality of the display device can be improved. In an embodiment of the present disclosure, the substrate 1 of the cover device 100 may be disposed facing the display panel of the display device.

In the present disclosure, the material of the substrate 1 may include quartz, glass, silicon wafer, sapphire, polycarbonate (PC), polyimide (PI), polypropylene (PP) ), polyethylene terephthalate (PET), or other plastic or polymer materials, or a combination of the foregoing, but the disclosure is not limited thereto. In one embodiment of the present disclosure, the substrate 1 is a cover glass of a display device.

In the present disclosure, the material of the first film layer 21 may include silicon dioxide, magnesium fluoride, or a combination thereof, but the disclosure is not limited thereto. At an optical wavelength of 550 nm, the refractive index of the first film layer 21 is greater than or equal to 1.38 and less than or equal to 1.48. In addition, at an optical wavelength of 550 nm, the extinction coefficient (k) of the first film layer 21 can be substantially 0 (for example, it can be 10 ^-4 to 10 ^-5 ). In other words, the first film layer 21 has Poor light absorption effect. The extinction coefficient refers to the medium's ability to absorb light of a specific wavelength and is an inherent property of the medium. The greater the extinction coefficient, the faster the light intensity attenuates when the light passes through the medium.

In the present disclosure, the material of the second film layer 22 may include a metal oxide. Examples of the metal oxide may include indium tin oxide (ITO), aluminum zinc oxide (AZO), indium oxide Indium gallium zinc oxide (IGZO), antimony tin oxide (ATO), fluorine-doped tin oxide (FTO), or combinations thereof, but the disclosure is not limited thereto. At an optical wavelength of 550 nm, the refractive index of the second film layer 22 is greater than or equal to 1.8 and less than or equal to 2.1. In addition, under the optical wavelength of 550 nm, the extinction coefficient (k) of the second film layer 22 is between greater than or equal to 0.01 and less than or equal to 0.05. In other words, the second film layer 22 can have a better light absorption effect and can Further reduce the effectiveness of reflected light. Therefore, in the present disclosure, at the optical wavelength of 550 nm, the transmittance of the optical film layer 2 can be less than or equal to 90%, for example, the transmittance is greater than or equal to 60% and less than or equal to 80%, but the present disclosure is not limited to this.

Since the second film layer 22 has a better light absorption effect, when the cover device 100 including the optical film layer 2 is applied to a display device, the contrast of the display device can be improved. More specifically, since the optical film layer 2 including the second film layer 22 has a better light absorption effect, when ambient light is incident on the cover device 100 from the outside, the light incident on the cover device 100 passes through the optical film layer. 2 can be absorbed for the first time to weaken the intensity of the incident light. Then, the light reflected from the cover device 100 passes through the optical film layer 2 again and can be absorbed for the second time to weaken the intensity of the reflected light. Therefore, the optical film layer 2 with better light absorption effect can improve the contrast of the display device. In addition, since the present disclosure does not require additional post-processing of the optical film layer 2, the optical film layer 2 can have a better light absorption effect. Therefore, the cover plate device 100 of the present disclosure can simplify the manufacturing process or save costs.

In the present disclosure, at an optical wavelength of 550 nm, the refractive index of the first film layer 21 may be smaller than the refractive index of the second film layer 22 . Through the alternating stacking design of film layers with high and low refractive index, the optical film layer 2 can achieve the effect of reducing reflected light through the interference effect produced. Therefore, in the present disclosure, at an optical wavelength of 550 nm, the reflectance of the optical film layer 2 can be less than or equal to 4%, but the present disclosure is not limited thereto.

In the present disclosure, the thickness of the optical film layer 2 is greater than or equal to 0.5 μm and less than or equal to 3 μm, but the present disclosure is not limited thereto. Here, the "thickness of the optical film layer 2" refers to the distance from the surface 201 of the optical film layer 2 that is farthest from the substrate 1 to the substrate surface 11. As shown in FIGS. 1A and 1B , the first film layer 21 is the film layer of the optical film layer 2 farthest from the substrate 1 . In other words, the “thickness of the optical film layer 2 ” may refer to the surface of the first film layer 21 211 to the substrate surface 11. When the thickness of the optical film layer 2 meets the aforementioned range, the thickness can be maintained while achieving the effect of reducing reflected light.

In the present disclosure, the optical film layer 2 can be prepared using a suitable coating or coating method, such as evaporation, sputtering, ion beam evaporation, dip coating, spin coating, roller coating, blade coating, and spray coating. method, but the present disclosure is not limited thereto. The first film layer 21 and the second film layer 22 can be prepared using the same or different methods respectively.

In addition, as shown in FIGS. 1A and 1B , the optical film layer 2 may further include a third film layer 23 and a fourth film layer 24 , and the third film layer 23 and the fourth film layer 24 are disposed on the first film layer 21 and under the second film layer 22, where, at an optical wavelength of 550 nm, the refractive index of the third film layer 23 is different from the refractive index of the fourth film layer 24. More specifically, the third film layer 23 is disposed between the second film layer 22 and the fourth film layer 24, and at an optical wavelength of 550 nm, the refractive index of the first film layer 21 and the third film layer 23 are respectively smaller than the second film layer 23. The refractive index of the film layer 22 and the fourth film layer 24. Through the alternate stacking design of high and low refractive index film layers, the effect of the optical film layer 2 on reducing reflected light can be improved.

In the present disclosure, the fourth film layer 24 is the film layer of the optical film layer 2 closest to the substrate 1. More specifically, as shown in FIGS. 1A and 1B, the fourth film layer 24 can be in contact with the substrate surface 11. In other words In other words, in this embodiment, compared with the first film layer 21 , the optical film layer 2 uses a film layer with a higher refractive index (for example, the fourth film layer 24 ) to contact the substrate surface 11 , but this disclosure is not limited to this.

In the present disclosure, the material of the third film layer 23 may be similar to the material of the first film layer 21 , and the material of the fourth film layer 24 may be similar to the material of the second film layer 22 , which will not be described again here. Therefore, under the optical wavelength of 550 nm, the refractive index of the third film layer 23 is greater than or equal to 1.38 and less than or equal to 1.48; the extinction coefficient (k) of the third film layer 23 can be substantially 0 (for example, it can be 10 ^-4 to 10 ^-5 ), in other words, the third film layer 23 has poor light absorption effect. At an optical wavelength of 550 nm, the refractive index of the fourth film layer 24 is greater than or equal to 1.8 and less than or equal to 2.1; the extinction coefficient (k) of the fourth film layer 24 is greater than or equal to 0.01 and less than or equal to 0.05. In other words, The fourth film layer 24 can have a better light absorption effect and can further reduce the effect of reflected light. In addition, the same or different materials may be used to prepare the first film layer 21 and the third film layer 23 respectively. Similarly, the same or different materials may be used to prepare the second film layer 22 and the fourth film layer respectively. twenty four. In one embodiment of the present disclosure, the material of the first film layer 21 is the same as the material of the third film layer 23 , and the material of the second film layer 22 is the same as the material of the fourth film layer 24 . In addition, the preparation method of the third film layer 23 and the fourth film layer 24 can be similar to the first film layer 21 and the second film layer 22, and will not be described again here.

In addition, although not shown in the figure, in other embodiments of the present disclosure, a plurality of film layers may be further included between the second film layer 22 and the third film layer 23 , and the materials of the plurality of film layers are different from those of the first film layer 21 and the first film layer 21 . The second film layer 22 is similar. Therefore, under the optical wavelength of 550 nm, the refractive index of the plurality of film layers is greater than or equal to 1.38 and less than or equal to 1.48 or greater than or equal to 1.8 and less than or equal to 2.1. The extinction coefficient of the plurality of film layers (k ) may be substantially 0 (eg, may be 10 ^-4 to 10 ^-5 ) or greater than or equal to 0.01 and less than or equal to 0.05. Through the alternate stacking design of film layers with high and low refractive index, the effect of reducing reflected light of the optical film layer 2 can be improved.

FIG. 2 is a schematic diagram of an optical film layer according to an embodiment of the present disclosure. Among them, the optical film layer in Figure 2 is similar to Figure 1B except for the following differences.

As shown in FIG. 1A and FIG. 2 , the optical film layer 2 may further include a fifth film layer 25 . The fifth film layer 25 is disposed between the fourth film layer 24 and the substrate 1 , and at an optical wavelength of 550 nm, the fifth film layer 25 is The refractive index of the film layer 25 is smaller than the refractive index of the second film layer 22 and the fourth film layer 24 respectively.

In the present disclosure, the material of the fifth film layer 25 may be similar to the material of the first film layer 21 and will not be described again here. Therefore, under the optical wavelength of 550 nm, the refractive index of the fifth film layer 25 is greater than or equal to 1.38 and less than or equal to 1.48; the extinction coefficient (k) of the fifth film layer 25 can be substantially 0 (for example, it can be 10 ^-4 to ^10-5 ). In addition, the same or different materials may be used to prepare the first film layer 21 , the third film layer 23 and the fifth film layer 25 respectively. In one embodiment of the present disclosure, the material of the fifth film layer 25 is the same as the material of the first film layer 21 . In addition, the preparation method of the fifth film layer 25 can be similar to that of the first film layer 21 and will not be described again.

In addition, as shown in FIG. 1A and FIG. 2 , the fifth film layer 25 is the film layer of the optical film layer 2 closest to the substrate 1 . More specifically, the fifth film layer 25 can be in contact with the substrate surface 11 . In other words, In this embodiment, compared with the second film layer 22 , a film layer with a lower refractive index is in contact with the substrate surface 11 , but the disclosure is not limited thereto.

In addition, although not shown in the figure, in other embodiments of the present disclosure, a plurality of film layers may be further included between the second film layer 22 and the third film layer 23 , and the materials of the plurality of film layers are different from those of the first film layer 21 and the first film layer 21 . The second film layer 22 is similar. Therefore, under the optical wavelength of 550 nm, the refractive index of the plurality of film layers may be greater than or equal to 1.38 and less than or equal to 1.48, or greater than or equal to 1.8 and less than or equal to 2.1. The extinction coefficients of the plurality of film layers ( k) may be about 0 or greater than or equal to 0.01 and less than or equal to 0.05. Through the alternate stacking design of film layers with high and low refractive index, the effect of reducing reflected light of the optical film layer 2 can be improved.

FIG. 3 is a schematic diagram of an optical film layer according to an embodiment of the present disclosure. Among them, the optical film layer in Figure 3 is similar to Figure 1B except for the following differences.

As shown in FIG. 3 , a plurality of film layers may be further included between the second film layer 22 and the third film layer 23 . The plurality of film layers may be, for example, 6 film layers. Therefore, in this embodiment, the optical film layer 2 It is composed of 10 film layers. In addition, the six film layers may be formed by alternately stacking low refractive index materials and high refractive index materials. More specifically, from the second film layer 22 to the third film layer 23 , the six film layers may be formed by low refractive index materials-high refractive index materials. It is composed of refractive index material-low refractive index material-high refractive index material-low refractive index material-high refractive index material. The low refractive index material may be similar to the material of the first film layer 21 , and the high refractive index material may be similar to the material of the second film layer 22 , which will not be described again here. In addition, the high refractive index materials of each layer may be the same or different, and the low refractive index materials of each layer may be the same or different.

In this embodiment, the thickness of the optical film layer 2 composed of 10 film layers can be between 600 nanometers (nm) and 700 nanometers (nm). Calculated using optical simulation software, at an optical wavelength of 550 nm, the transmittance of optical film layer 2 is greater than or equal to 60% and less than or equal to 80%, and the reflectivity is greater than or equal to 1.9% and less than or equal to 3.1%.

The above specific examples are to be construed as illustrative only and not in any way limiting of the remainder of the disclosure.

100:Cover device 1:Substrate 11:Substrate surface 2: Optical coating layer 201: Surface 21: First film layer 211:Surface 22: Second film layer 23: The third film layer 24:The fourth film layer 25:Fifth film layer

FIG. 1A is a schematic diagram of a cover device according to an embodiment of the present disclosure. FIG. 1B is a schematic diagram of an optical film layer according to an embodiment of the present disclosure. FIG. 2 is a schematic diagram of an optical film layer according to an embodiment of the present disclosure. FIG. 3 is a schematic diagram of an optical film layer according to an embodiment of the present disclosure.

without

100:Cover device

1:Substrate

11:Substrate surface

2: Optical coating layer

201: Surface

Claims (14)

A cover device including: a substrate; and An optical film layer is provided on the substrate, wherein the optical film layer includes a first film layer and a second film layer, and the first film layer is provided on the second film layer; Wherein, at an optical wavelength of 550 nm, the refractive index of the first film layer is different from the refractive index of the second film layer, and the second film layer includes a metal oxide. The cover device of claim 1, wherein at an optical wavelength of 550 nm, the refractive index of the first film layer is smaller than the refractive index of the second film layer. The cover device of claim 2, wherein the first film layer is the film layer of the optical film layer that is farthest from the substrate. The cover device of claim 1, wherein the material of the first film layer includes silicon dioxide, magnesium fluoride, or a combination thereof. The cover device of claim 1, wherein the metal oxide includes indium tin oxide, aluminum zinc oxide, indium gallium zinc oxide, tin antimony oxide, fluorine-doped tin oxide, or a combination thereof. The cover device of claim 1, wherein at an optical wavelength of 550 nm, the refractive index of the first film layer is greater than or equal to 1.38 and less than or equal to 1.48. The cover device of claim 1, wherein at an optical wavelength of 550 nm, the refractive index of the second film layer is greater than or equal to 1.8 and less than or equal to 2.1. The cover device of claim 1, wherein at an optical wavelength of 550 nm, the extinction coefficient of the second film layer is greater than or equal to 0.01 and less than or equal to 0.05. The cover device according to claim 1, wherein the thickness of the optical film layer is greater than or equal to 0.5 μm and less than or equal to 3 μm. The cover device of claim 1, wherein at an optical wavelength of 550 nm, the reflectance of the optical film layer is less than or equal to 4%. The cover device of claim 1, wherein at an optical wavelength of 550 nm, the transmittance of the optical film layer is greater than or equal to 60% and less than or equal to 80%. The cover device of claim 1, wherein the optical film layer further includes a third film layer and a fourth film layer, and the third film layer and the fourth film layer are disposed between the first film layer and the fourth film layer. Under the second film layer, the refractive index of the third film layer is different from the refractive index of the fourth film layer at an optical wavelength of 550 nm. The cover device of claim 12, wherein the third film layer is disposed between the second film layer and the fourth film layer, and under an optical wavelength of 550 nm, the first film layer and the third film layer are The refractive index of the film layer is respectively smaller than the refractive index of the second film layer and the fourth film layer. The cover device of claim 13, wherein the optical film layer further includes a fifth film layer, the fifth film layer is disposed between the fourth film layer and the substrate, and at an optical wavelength of 550 nm, The refractive index of the fifth film layer is smaller than the refractive index of the second film layer and the fourth film layer respectively.