CN117008223A

CN117008223A - Cover plate device

Info

Publication number: CN117008223A
Application number: CN202210471865.0A
Authority: CN
Inventors: 朱韦名; 许育纯
Original assignee: Innolux Display Corp
Current assignee: Innolux Corp
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2023-11-07

Abstract

The present disclosure provides a cover plate device comprising: a substrate; the optical film layer is arranged on the substrate, wherein the optical film layer comprises a first film layer and a second film layer, and the first film layer is arranged on the second film layer; wherein, at an optical wavelength of 550nm, the refractive index of the first film layer is different from the refractive index of the second film layer, and the second film layer comprises a metal oxide.

Description

Cover plate device

Technical Field

The present disclosure relates to a cover device, and more particularly, to a cover device including optical film layers with different refractive indexes.

Background

With the continuous progress of technology and the adaptation to the usage habits of users, the display device is still being improved. At present, when the display device is used outdoors or under the condition of strong ambient light, the problems of interference to the vision or contrast reduction caused by too strong reflected light, or the aesthetic problems of obvious boundaries between the frame and the display panel when the display device is in a dark state exist.

Conventionally, the effect of reducing the reflected light can be achieved by plating an anti-reflection film on the surface of the cover plate of the display device, or the aesthetic problem can be improved by dyeing the cover plate. However, the conventional method still has the problems of complicated preparation process, poor contrast or anti-reflection effect and the like.

Therefore, there is a need to develop a cover device to improve the existing defects.

Disclosure of Invention

Drawings

FIG. 1A is a schematic diagram of a cover plate apparatus 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 illustration of an optical film layer according to another embodiment of the present disclosure;

fig. 3 is a schematic view of an optical film layer according to another embodiment of the present disclosure.

[ reference numerals description ]:

100: a cover plate device;

1: a substrate;

11: a substrate surface;

2: an optical film layer;

201: a surface;

21: a first film layer;

211: a surface;

22: a second film layer;

23: a third film layer;

24: a fourth film layer;

25: and a fifth film layer.

Detailed Description

The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.

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

Certain terminology will be used throughout the present disclosure and in the appended claims to refer to particular components. Those skilled in the art will appreciate that electronic device manufacturers may refer to a component by different names. It is not intended to distinguish between components that differ in function but not name. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to …".

Directional terms mentioned herein, such as: "upper", "lower", "front", "rear", "left", "right", etc., are merely directions with reference to the drawings. Thus, directional terminology is used for purposes of illustration and is not intended to be limiting of the disclosure. In the drawings, the various drawings depict general features of methods, structures and/or materials used in particular embodiments. However, these drawings should not be construed as defining or limiting the scope or nature of what is covered by these embodiments. For example, the relative dimensions, thicknesses, and locations of various layers, regions, and/or structures may be reduced or exaggerated for clarity.

The disclosure describes one structure (or layer, component, substrate) being located on/over another structure (or layer, component, substrate) and may refer to two structures being adjacent and directly connected, or may refer to two structures being adjacent and not directly connected. Indirect connection refers to having at least one intervening structure (or intervening layers, intervening components, intervening substrates, intervening spaces) between two structures, the lower surface of one structure being adjacent to or directly connected to the upper surface of the intervening structure, and the upper surface of the other structure being adjacent to or directly connected to the lower surface of the intervening structure. The intermediate structure may be a single-layer or multi-layer solid structure or a non-solid structure, and is not limited thereto. 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, i.e., that at least one structure is sandwiched between the structure and the other structure.

The terms "about," "equal," or "identical," "substantially," or "substantially" are generally construed to be within 20% of a given value or range, or to be within 10%, 5%, 3%, 2%, 1%, or 0.5% of a given value or range.

As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise, nor do it represent the order in which a given element (or elements) and another element(s) or method of manufacture) reside. The same words may not be used in the claims and the description, whereby a first element in the description may be a second element in the claims.

In the present disclosure, the thickness may be measured by an optical microscope, and the thickness may be measured by a cross-sectional image in an electron microscope, but is not limited thereto. In addition, any two values or directions used for comparison may have some error. In addition, references in this disclosure to the terms "equal," "identical," "substantially," or "substantially" generally represent a range that falls within 10% of a given value or range. Furthermore, the terms "a given range of values from a first value to a second value," "a given range falling within a range of values from the first value to the second value," and the like, mean that the given range includes the first value, the second value, and other values therebetween.

It is to be understood that the following exemplary embodiments may be substituted, rearranged, and mixed for the features of several different embodiments to achieve other embodiments without departing from the spirit of the disclosure. Features of the embodiments can be mixed and matched at will without departing from the spirit of the invention or conflicting.

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 will be appreciated that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Fig. 1A is a schematic diagram of a cover plate apparatus 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 fig. 1A and 1B, a cover plate device 100 of the present disclosure may include: a substrate 1; the optical film layer 2 is arranged on the substrate 1, wherein the optical film layer 2 comprises a first film layer 21 and a second film layer 22, and the first film layer 21 is arranged on the second film layer 22; wherein, at an optical wavelength of 550nm, the refractive index of the first film layer 21 is different from the refractive index of the second film layer 22. The optical film layer 2 can achieve the effect of reducing reflected light through the film layer lamination design with different refractive indexes. When the cover device 100 including the optical film layer 2 is applied to a display device, the contrast ratio or optical taste 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 toward the display panel of the display device.

In the present disclosure, the material of the substrate 1 may include a quartz, a glass, a silicon wafer, a sapphire, a Polycarbonate (PC), a Polyimide (PI), a polypropylene (PP), a polyethylene terephthalate (polyethylene terephthalate, PET), or other plastic or polymer materials, or a combination of the foregoing, but the present disclosure is not limited thereto. In one embodiment of the present disclosure, the substrate 1 is a cover glass (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 present disclosure is not limited thereto. 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 at an optical wavelength of 550 nm. In addition, the extinction coefficient (extinction coefficient, k) of the first film layer 21 may be substantially 0 (e.g., may be 10) ^-4 To 10 ^-5 ) In other words, the first film layer 21 has a poor light absorbing effect. The extinction coefficient refers to the absorption of light at a particular wavelength by a medium, and is an inherent property of a medium, with a larger extinction coefficient indicating a more rapid light intensity decay as light passes through the medium.

In the present disclosure, the material of the second film layer 22 may include a metal oxide, and examples of the metal oxide may include Indium Tin Oxide (ITO), aluminum zinc oxide (aluminum zinc oxide, AZO), indium gallium zinc oxide (indium gallium zinc oxide, IGZO), tin antimony oxide (antimony tin oxide, ATO), fluorine-doped tin oxide (FTO), or a combination thereof, but the present disclosure is not limited thereto. 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 at an optical wavelength of 550 nm. In addition, at an optical wavelength of 550nm, the extinction coefficient (k) of the second film 22 is greater than or equal to 0.01 and less than or equal to 0.05, in other words, the second film 22 has a better light absorption effect, and the effect of reflecting light can be further reduced. Thus, in the present disclosure, the transmittance of the optical film layer 2 may be less than or equal to 90% at an optical wavelength of 550nm, 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 thereto.

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

In the present disclosure, the refractive index of the first film layer 21 may be smaller than the refractive index of the second film layer 22 at an optical wavelength of 550 nm. Through the design of alternately stacking the film layers with high and low refractive indexes, the optical film layer 2 can achieve the effect of reducing reflected light through the interference effect generated by the film layers. Accordingly, in the present disclosure, the reflectance of the optical film layer 2 may be less than or equal to 4% at an optical wavelength of 550nm, 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 2" refers to a distance from a surface 201 of the optical film 2 furthest from the substrate 1 to the substrate surface 11. As shown in fig. 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 distance between the surface 211 of the first film layer 21 and the substrate surface 11. When the thickness of the optical film layer 2 is in accordance with the above range, the thinning can be maintained while achieving the effect of reducing the reflected light.

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

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

In the present disclosure, the fourth film 24 is the film of the optical film 2 closest to the substrate 1, and more specifically, as shown in fig. 1A and 1B, the fourth film 24 may be in contact with the substrate surface 11, in other words, in the present embodiment, the optical film 2 is in contact with the substrate surface 11 with a higher refractive index film (e.g., the fourth film 24) than the first film 21, but the present disclosure is not limited thereto.

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 is not described herein. Thus, at an optical wavelength of 550nm, 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 may be substantially 0 (e.g., may be 10 ^-4 To 10 ^-5 ) In other words, the third film layer 23 has a poor light absorbing effect. 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 at an optical wavelength of 550 nm; the extinction coefficient (k) of the fourth film 24 is greater than or equal to 0.01 and less than or equal to 0.05, in other words, the fourth film 24 has a better light absorbing effect, and the effect of reflected light can be further reduced. In addition, the first film layer 21 and the third film layer 23 may be respectively prepared using the same or different materials, and similarly, the second film layer 22 and the fourth film layer 24 may be respectively prepared using the same or different materials. In an 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 may be similar to that of the first film layer 21 and the second film layer 22, and will not be described herein.

In addition, although not shown, in other embodiments of the present disclosure, the second film layer 22 and the third film layer 23 may further include a plurality of film layers, which are made of similar materials to the first film layer 21 and the second film layer 22, so that 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, respectively, at an optical wavelength of 550nm, and the extinction coefficient (k) of the plurality of film layers may be substantially 0 (e.g., may be 10 ^-4 To 10 ^-5 ) Or greater than or equal to 0.01 and less than or equal to 0.05. By the design of alternately stacking the film layers with high and low refractive indexes, the effect of reducing reflected light of the optical film layer 2 can be improved.

Fig. 2 is a schematic view of an optical film layer according to another embodiment of the present disclosure. The optical film layer of fig. 2 is similar to that of fig. 1B, except for the following differences.

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

In the present disclosure, the material of the fifth film layer 25 may be similar to that of the first film layer 21, and will not be described herein. Thus, at an optical wavelength of 550nm, 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 may be substantially 0 (e.g., may be 10 ^-4 To 10 ^-5 ). In addition, the first, third and fifth film layers 21, 23 and 25 may be prepared using the same or different materials, respectively. In an 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 may be similar to that of the first film layer 21, and will not be described herein.

Further, as shown in fig. 1A and 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 may be in contact with the substrate surface 11, in other words, in the present embodiment, the film layer with a lower refractive index than the second film layer 22 is in contact with the substrate surface 11, but the disclosure is not limited thereto.

Furthermore, although not shown, 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 plurality of film layers may be made of similar materials to the first film layer 21 and the second film layer 22, and thus, the plurality of film layers may have refractive indexes of 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, respectively, and extinction coefficients (k) of the plurality of film layers may be about 0 or greater than or equal to 0.01 and less than or equal to 0.05 at an optical wavelength of 550 nm. By the design of alternately stacking the film layers with high and low refractive indexes, the effect of reducing reflected light of the optical film layer 2 can be improved.

Fig. 3 is a schematic view of an optical film layer according to another embodiment of the present disclosure. Wherein the optical film layer of fig. 3 is similar to that of fig. 1B, except for the following differences.

As shown in fig. 3, the second film layer 22 and the third film layer 23 may further include a plurality of film layers, for example, 6 film layers, so that in the present embodiment, the optical film layer 2 is composed of 10 film layers. Further, 6 film layers may be formed by alternately stacking a low refractive index material and a high refractive index material, and more specifically, 6 film layers may be composed of a low refractive index material-a high refractive index material-a low refractive index material-a high refractive index material from the second film layer 22 toward the third film layer 23. 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 herein. Further, the high refractive index material of each layer may be the same or different, and the low refractive index material 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 may be between 600 nanometers (nm) and 700 nm. Calculated by optical simulation software, the light transmittance of the optical film layer 2 is more than or equal to 60% and less than or equal to 80% at the optical wavelength of 550nm, and the reflectivity is more than or equal to 1.9% and less than or equal to 3.1%.

The above specific embodiments should be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the invention thereto, but to limit the invention thereto, and any modifications, equivalents, improvements and equivalents thereof may be made without departing from the spirit and principles of the invention.

Claims

1. A cover plate apparatus, comprising:

a substrate; and

the optical film layer is arranged on the substrate, wherein the optical film layer comprises a first film layer and a second film layer, and the first film layer is arranged on the second film layer;

wherein, at an optical wavelength of 550nm, the refractive index of the first film layer is different from the refractive index of the second film layer, and the second film layer comprises a metal oxide.

2. The cover device of claim 1, wherein the refractive index of the first film layer is less than the refractive index of the second film layer at an optical wavelength of 550 nm.

3. The cover device of claim 2, wherein the first film layer is a film layer of the optical film layer furthest from the substrate.

4. The cover device of claim 1, wherein the material of the first film layer comprises silicon dioxide, magnesium fluoride, or a combination thereof.

5. The cover plate device of claim 1, wherein the metal oxide comprises indium tin oxide, aluminum zinc oxide, indium gallium zinc oxide, tin antimony oxide, fluorine doped tin oxide, or a combination thereof.

6. The cover device of claim 1, wherein the refractive index of the first film layer is greater than or equal to 1.38 and less than or equal to 1.48 at an optical wavelength of 550 nm.

7. The cover device of claim 1, wherein the refractive index of the second film layer is greater than or equal to 1.8 and less than or equal to 2.1 at an optical wavelength of 550 nm.

8. The cover device of claim 1, wherein the second film layer has an extinction coefficient greater than or equal to 0.01 and less than or equal to 0.05 at an optical wavelength of 550 nm.

9. The cover device of claim 1, wherein the optical film layer has a thickness greater than or equal to 0.5 μm and less than or equal to 3 μm.

10. The cover device of claim 1, wherein the optical film has a reflectivity of less than or equal to 4% at an optical wavelength of 550 nm.

11. The cover device of claim 1, wherein the optical film has a transmittance of greater than or equal to 60% and less than or equal to 80% at an optical wavelength of 550 nm.

12. The cover device of claim 1, wherein the optical film further comprises a third film and a fourth film disposed under the first film and the second film, wherein the refractive index of the third film is different from the refractive index of the fourth film at an optical wavelength of 550 nm.

13. The cover device of claim 12, wherein the third film layer is disposed between the second film layer and the fourth film layer, and the refractive index of the first film layer and the third film layer is smaller than the refractive index of the second film layer and the fourth film layer, respectively, at an optical wavelength of 550 nm.

14. The cover device of claim 13, wherein the optical film further comprises a fifth film disposed between the fourth film and the substrate, and having refractive indices less than the refractive indices of the second film and the fourth film, respectively, at an optical wavelength of 550 nm.