CN112817071B - Optical fitting - Google Patents

Abstract

The present invention provides an optical accessory, which is arranged on a display surface of a display device. The optical accessory includes an optical film stack and at least one electrode element. The optical film stack includes a plurality of optical films with different refractive indices and at least one optical control film. At least one electrode element is correspondingly electrically connected to at least one optical control film, wherein the reflectivity of the optical film stack to ambient light is less than or equal to 1%, and the at least one optical control film is suitable for increasing the reflectivity to ambient light by applying a voltage greater than or equal to 1%.

Description

Optical accessories

technical field

The present invention relates to an optical device, in particular to an optical accessory.

Background technique

Generally speaking, the surface of electronic screens (such as computer monitors, robots, smart phones or tablet computers, etc.) are often coated with anti-reflection layers to reduce reflections caused by ambient light and reduce visibility. In a specific method, a single layer or multiple layers of material can be coated between the transparent substrate and the air to reduce the reflection at the interface between the glass and the air.

However, in a general electronic screen, the coated anti-reflection layer is a passive optical functional layer. In other words, there is no further control to produce other kinds of optical effects. If it can be changed to an active optical function layer, the electronic screen can provide more uses when being viewed, for example, security functions such as discoloration or privacy protection. Therefore, how to design the passive optical functional layer to be an active optical functional layer to generate other kinds of optical effects is a work that needs to be done in the art.

SUMMARY OF THE INVENTION

The invention provides an optical accessory, which can switch the anti-reflection function or the non-anti-reflection function in different situations to achieve a good optical display effect or privacy protection effect.

An embodiment of the present invention provides an optical accessory, which is arranged on a display surface of a display device. The optical accessory includes an optical film stack and at least one electrode element. The optical film stack includes a plurality of optical films with different refractive indices and at least one optical control film. At least one electrode element is correspondingly electrically connected to at least one optical control film, wherein the reflectivity of the optical film stack to ambient light is less than or equal to 1%, and the at least one optical control film is suitable for increasing the reflectivity to ambient light by applying a voltage greater than or equal to 1%.

In an embodiment of the present invention, the above-mentioned at least one optical control film improves the reflectivity of ambient light by changing the refractive index or the extinction coefficient.

In an embodiment of the present invention, the number of the aforementioned at least one optical control film is the same as the number of the at least one electrode element.

In an embodiment of the present invention, the number of the at least one optical control film and the number of the at least one electrode element are both one.

In an embodiment of the present invention, at least one of the above-mentioned at least one optical control film is located between the optical film and the display surface.

In an embodiment of the present invention, the above-mentioned optical film includes at least one first optical film and at least one second optical film which are alternately stacked, and the refractive index of the at least one first optical film is greater than that of the at least one second optical film.

In an embodiment of the present invention, the material of the above-mentioned at least one optical control film is the same as that of the at least one first optical film.

In an embodiment of the present invention, the above-mentioned electrode elements are distributed at the edge of the display device.

In an embodiment of the present invention, the above-mentioned distribution positions of the electrode elements correspond to the positions of a plurality of display pixels in the display device.

In an embodiment of the present invention, the above-mentioned optical accessory is detachably arranged on the display device.

Based on the above, in the optical accessory of the present invention, the optical film stack of the optical accessory is composed of a plurality of optical films with different refractive indices and at least one optical control film. Therefore, the anti-reflection function can be produced in general, so that the display device can achieve a good optical display effect. The optical control film can change the refractive index and the extinction coefficient by manipulating the control of the electrode element. In this way, the anti-reflection function or the non-anti-reflection function can be switched in different situations, thereby achieving a good optical display effect or privacy protection effect.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

Description of drawings

1 is a schematic diagram of an optical accessory disposed on a display surface of a display device according to an embodiment of the present invention;

Fig. 2 is a graph showing the change of light transmittance of different wavelengths under different voltages of an existing material;

FIG. 3 is a graph showing the change of the refractive index of the material of FIG. 2 to light of different wavelengths under different heat treatments;

FIG. 4 is a graph showing the change of the extinction coefficient of the material of FIG. 2 under different heat treatments to different wavelengths of light.

Description of reference numerals

10: Display device

100: Optical Accessories

110: Optical film stack

112: Optical film

112_1: The first optical film

112_2: Second Optical Film

114: Optical control film

120: Electrode element

201～206, 301, 302, 401, 402: line segment

L: ambient light

S: display surface

Detailed ways

1 is a schematic diagram of an optical accessory disposed on a display surface of a display device according to an embodiment of the present invention. Please refer to Figure 1. This embodiment provides an optical accessory 100 for being disposed on the display surface S of the display device 10 . For example, the optical accessory 100 is directly fabricated on the display surface S of the display device 10 , or is detachably arranged on the display device 10 , but the present invention is not limited thereto. For example, the optical accessory 100 may be a screen pendant mounted on the display device 10 to cover the display surface S. As shown in FIG.

Specifically, in this embodiment, the optical accessory 100 includes an optical film stack 110 and at least one electrode element 120 . The optical film stack 110 includes a plurality of optical films 112 with different refractive indices and at least one optical control film 114 . In this embodiment, the optical film 112 includes at least one first optical film 112_1 and at least one second optical film 112_2 stacked alternately, wherein the refractive index of the at least one first optical film 112_1 is greater than that of the at least one second optical film 112_2 . For example, in this embodiment, the optical film stack 110 is composed of a first optical film 112_1, two second optical films 112_2, and an optical control film 114, which are sequentially composed of the optical control film 114, The second optical film 112_2, the first optical film 112_1, and the second optical film 112_2 are stacked. In other words, in this embodiment, the refractive indices are high, low, high, and low in order from bottom to top, but the present invention is not limited to this. It is worth mentioning that, in this embodiment, the uppermost layer of the optical film stack 110 is a film layer with a relatively small refractive index, that is, the second optical film 112_2 is arranged on the uppermost layer of the optical film stack 110 . In the embodiment with the five-layer stack structure in the optical film stack, the optical control film 114 , the first optical film 112_1 , the second optical film 112_2 , the first optical film 112_1 , and the second optical film can be sequentially arranged from bottom to top 112_2 are stacked, wherein the optical control film 114 can be made of the same material as the second optical film 112_2 or other materials whose refractive index is smaller than that of the first optical film 112_1. In other words, the refractive index is low, high, low, high, low in order from bottom to top. In this embodiment, at least one of the optical control films 114 is located between the optical film 112 and the display surface S, but the present invention is not limited thereto.

The first optical film 112_1 and the optical control film 114 can be selected from tungsten trioxide (Tungsten Trioxide, WO3) or Niobium pentoxide (Niobium pentoxide, Nb ₂ O ₅ ), while the second optical film 112_2 can be selected from silicon dioxide (Silicondioxide, SiO ₂ ). In other words, in this embodiment, the material of the optical control film 114 is the same as the material of the first optical film 112_1. In other embodiments, the material of the optical control film 114 and the material of the first optical film 112_1 can be made of different materials, and the present invention is not limited thereto. Therefore, under the staggered stacking of the niobium pentoxide optical film and the silicon dioxide optical film, the reflectivity of the optical film stack 110 to the ambient light L can be less than or equal to 1%, thereby achieving the anti-reflection function.

The electrode element 120 is correspondingly electrically connected to the optical control film 114 . Specifically, the electrode elements 120 are, for example, a pair of electrode structures distributed at the edge of the display device 10 , or the electrode elements 120 are distributed at positions corresponding to multiple display pixel positions in the display device 10 , but the invention is not limited thereto. In addition, in this embodiment, the number of the electrode element 120 and the optical control film 114 is the same, for example, both are one. However, in other embodiments, the same number of multiple electrode elements 120 and multiple optical control films 114 can also be used, and the present invention is not limited thereto. In this embodiment, the electrode element 120 can be triggered by externally provided physical buttons, or activated by computer software control, but the present invention is not limited thereto.

FIG. 2 is a graph showing the change of the transmittance of a conventional material to different wavelengths of light under different voltages. FIG. 3 is a graph showing the change of the refractive index of the material of FIG. 2 under different heat treatments to different wavelengths of light. FIG. 4 is a graph showing the change of the extinction coefficient of the material of FIG. 2 under different heat treatments to different wavelengths of light. Please refer to Figure 1 to Figure 4. It should be noted that the graphs of material properties in Figures 2 to 4 are quoted from the article in the journal Proceedings of SPIE-The International Society for Optical Engineering 8902:24 (2013): Characterization and application of WO3films for electrochromic devices. The optical control film 114 and the first optical film 112_1 of this embodiment can use the materials taught in FIGS. 2 to 4 , so the following description will take tungsten trioxide as the material for the optical control film 114 and the first optical film 112_1 as an example. . In one embodiment, the material of the optical control film 114 and the first optical film 112_1 is tungsten trioxide. The optical control film 114 made of tungsten trioxide is suitable for increasing the reflectivity of the ambient light L by more than or equal to 1% by applying a voltage. Specifically, when the electrode element 120 applies different voltages to the optical control film 114 , the transmittance of the optical control film 114 to light of different wavelengths will change with different voltages, as shown in FIG. 2 .

In detail, as shown in FIG. 2 , the X-axis coordinate represents the wavelength of ambient light, and the unit is nanometers. The Y-axis coordinate represents the transmittance to ambient light, displayed as a percentage. The line segment 201 represents the transmittance of the optical control film 114 to light of different wavelengths when the electrode element 120 does not apply a voltage to the optical control film 114 . The line segment 202 represents the transmittance of the optical control film 114 to light of different wavelengths when the electrode element 120 applies a voltage of 1 volt to the optical control film 114 . The line segment 203 represents the transmittance of the optical control film 114 to light of different wavelengths when the electrode element 120 applies a voltage of 2 volts to the optical control film 114 . The line segment 204 represents the transmittance of the optical control film 114 to light of different wavelengths when the electrode element 120 applies a voltage of 3 volts to the optical control film 114 . The line segment 205 represents the transmittance of the optical control film 114 to light of different wavelengths when the electrode element 120 applies a voltage of 4 volts to the optical control film 114 . The line segment 206 represents the transmittance of the optical control film 114 to light of different wavelengths when the electrode element 120 applies a voltage of 5 volts to the optical control film 114 .

In other words, the optical control film 114 has different transmittances for different wavelengths of light with different voltages, because the refractive index or extinction coefficient of the optical control film 114 is changed. In some embodiments, different processing can be performed when fabricating the optical control film 114 according to different requirements. For example, as shown in FIG. 3 and FIG. 4 , in FIG. 3 , the X-axis coordinate represents the wavelength of ambient light, and the unit is nanometers. The Y-axis coordinate represents the refractive index to ambient light. In Figure 4, the X-axis coordinate represents the wavelength of ambient light in nanometers. The Y-axis coordinate represents the extinction coefficient for ambient light. Line segment 301 represents the refractive index of the optical control film 114 for light of different wavelengths before thermal processing. The line segment 302 represents the refractive index of the optical control film 114 with respect to light of different wavelengths after thermal processing at 400 degrees Celsius. Line segment 401 represents the extinction coefficient of the optical control film 114 for light of different wavelengths before thermal processing. The line segment 402 represents the extinction coefficient of the optical control film 114 for light of different wavelengths after thermal processing at 400 degrees Celsius.

Therefore, the optical control film 114 shown in FIG. 2 can change the characteristics of different transmittances when applying different voltage values, and the optical control film 114 shown in FIG. 3 can change the characteristics of different refractive indices and extinction coefficients under different thermal processing treatments. It can be seen that, in the optical accessory 100 , a voltage can be applied to the optical control film 114 through the electrode element 120 to change the refractive index of the optical control film 114 to generate transmittance to light of different wavelengths, thereby eliminating the anti-reflection of the ambient light L. , so that the user cannot obtain clear image information from the display surface S of the display device 10 . In other words, the optical control film 114 to which the voltage is applied can also provide a privacy protection effect. In this way, the refractive index and extinction coefficient of the optical control film 114 can be controlled by manipulating the electrode element 120 to switch the anti-reflection function or the non-anti-reflection function in different situations, thereby achieving a good optical display effect or anti-peeping effect. In addition, compared with general electrochromic materials, this embodiment can further save components required for configuring electrochromic materials such as electrolytes.

It is worth mentioning that if the optical control film 114 is made of tungsten trioxide, a dark blue color can be generated by applying a voltage. In some embodiments, the optical control film 114 can be made of molybdenum oxide, niobium oxide or titanium oxide. Thus, different opaque colors can be produced by applying a voltage. Therefore, the privacy protection effect of the display surface S can be further improved.

To sum up, in the optical accessory of the present invention, the optical film stack of the optical accessory is composed of a plurality of optical films with different refractive indices and at least one optical control film. Therefore, the anti-reflection function can be produced in general, so that the display device can achieve a good optical display effect. The optical control film can change the refractive index and the extinction coefficient by manipulating the control of the electrode element. In this way, the anti-reflection function or the non-anti-reflection function can be switched in different situations, thereby achieving a good optical display effect or privacy protection effect.

Although the present invention has been disclosed above with examples, it is not intended to limit the present invention. Any person skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be subject to what is defined in the claims.

Claims (10)

1. An optical accessory to be arranged on a display surface of a display device, comprising: an optical film stack, comprising a plurality of optical films with different refractive indices and at least one optical control film; and At least one electrode element is correspondingly electrically connected to the at least one optical control film, wherein the reflectivity of the optical film stack to ambient light is less than or equal to 1%, and the at least one optical control film is suitable for applying a voltage to the control film. The reflectivity of the ambient light is increased, so that the reflectivity of the ambient light is greater than or equal to 1%. 2 . The optical accessory according to claim 1 , wherein the at least one optical control film improves the reflectivity of the ambient light by changing the refractive index or the extinction coefficient. 3 . 3. The optical accessory of claim 1, wherein the number of the at least one optical control film is the same as the number of the at least one electrode element. 4 . The optical accessory of claim 1 , wherein the number of the at least one optical control film and the number of the at least one electrode element are both one. 5 . 5. The optical accessory of claim 1, wherein at least one of the at least one optical control film is located between the plurality of optical films and the display surface. 6 . The optical accessory of claim 1 , wherein the plurality of optical films comprise at least one first optical film and at least one second optical film that are alternately stacked, the at least one first optical film having a refractive index greater than that of the at least one second optical film. 7. The optical accessory of claim 1, wherein the material of the at least one optical control film is the same as the material of the at least one first optical film. 8. The optical accessory of claim 1, wherein the electrode elements are distributed at an edge of the display device. 9. The optical accessory of claim 1, wherein the electrode element distribution locations correspond to a plurality of display pixel locations in the display device. 10. The optical accessory of claim 1, wherein the optical accessory is detachably disposed on the display device.

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