CN112817071B

CN112817071B - Optical fitting

Info

Publication number: CN112817071B
Application number: CN201911054031.4A
Authority: CN
Inventors: 陈煜东; 陈俊荣
Original assignee: Henghao Technology Co Ltd
Current assignee: Henghao Technology Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2022-08-02
Anticipated expiration: 2039-10-31
Also published as: CN112817071A

Abstract

The invention provides an optical accessory which is arranged on a display surface of a display device. The optical assembly comprises an optical film stack and at least one electrode element. The optical film stack comprises a plurality of optical films with different refractive indexes and at least one optical regulation film. The at least one electrode element is correspondingly and electrically connected with the at least one optical regulation and control film, wherein the reflectivity of the optical film stack to the ambient light is less than or equal to 1%, and the reflectivity of the at least one optical regulation and control film to the ambient light is improved to be greater than or equal to 1% by applying voltage.

Description

Optical fitting

Technical Field

The present disclosure relates to optical devices, and particularly to an optical accessory.

Background

Generally, the surface of an electronic screen (e.g., a computer monitor, a robot, a smart phone, a tablet computer, etc.) is often coated with an anti-reflection layer to reduce visibility by reducing reflection caused by ambient bright light. In particular, a single layer or multiple layers of material may be applied between the transparent substrate and the air to reduce reflection at the interface between the glass and the air.

However, in a typical electronic screen, the anti-reflection layer applied is a passive optical functional layer. In other words, other kinds of optical effects cannot be generated by further control. If the optical function layer can be changed into an active optical function layer, the electronic screen can be provided with more purposes when being viewed, such as a security function of color changing or peeping prevention. Therefore, the art is dedicated to designing passive optical functional layers as active optical functional layers to produce other kinds of optical effects.

Disclosure of Invention

The invention provides an optical accessory which can switch an anti-reflection function or a non-anti-reflection function under different situations so as to achieve a good optical display effect or a good peep-proof effect.

An embodiment of the invention provides an optical accessory, configured to be disposed on a display surface of a display device. The optical assembly comprises an optical film stack and at least one electrode element. The optical film stack comprises a plurality of optical films with different refractive indexes and at least one optical regulation film. The at least one electrode element is correspondingly and electrically connected with the at least one optical regulation and control film, wherein the reflectivity of the optical film stack to the ambient light is less than or equal to 1%, and the reflectivity of the at least one optical regulation and control film to the ambient light is improved to be greater than or equal to 1% by applying voltage.

In an embodiment of the invention, the at least one optical modulation film increases the reflectivity to the ambient light by changing the refractive index or the extinction coefficient.

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

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

In an embodiment of the invention, at least one of the at least one optical modulation film is located between the optical film and the display surface.

In an embodiment of the invention, the optical films include at least one first optical film and at least one second optical film stacked alternately, and a refractive index of the at least one first optical film is greater than a refractive index of the at least one second optical film.

In an embodiment of the invention, a material of the at least one optical modulation film is the same as a material of the at least one first optical film.

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

In an embodiment of the invention, the distribution positions of the electrode elements correspond to a plurality of display pixel positions in the display device.

In an embodiment of the invention, the optical accessory is detachably disposed on the display device.

In view of the above, in the optical component of the present invention, the optical film stack of the optical component is composed of a plurality of optical films with different refractive indexes and at least one optical modulation film. Therefore, the anti-reflection function can be generated under the general condition, and the display device achieves good optical display effect. The optical regulating film can change the refractive index and the extinction coefficient through controlling the electrode element. Therefore, the anti-reflection function or the non-anti-reflection function can be switched under different situations, and further a good optical display effect or a good peeping prevention effect is achieved.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic diagram of an optical assembly disposed on a display surface of a display device according to an embodiment of the invention;

FIG. 2 is a graph of the transmittance of a prior art material for different wavelengths of light at different voltages;

FIG. 3 is a graph of the refractive index of the material of FIG. 2 under different thermal treatments for different wavelengths of light;

FIG. 4 is a graph of the change in extinction coefficient of the material of FIG. 2 under different thermal treatments for different wavelengths of light.

Description of the reference numerals

10: display device

100: optical fitting

110: optical film stack

112: optical film

112_ 1: first optical film

112_ 2: second optical film

114: optical control film

120: electrode element

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

L: ambient light

S: display surface

Detailed Description

Fig. 1 is a schematic diagram of an optical accessory disposed on a display surface of a display device according to an embodiment of the invention. Please refer to fig. 1. The present embodiment provides an optical accessory 100, which is disposed on a display surface S of a display device 10. The optical component 100 is, for example, directly formed on the display surface S of the display device 10 or detachably provided 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.

In detail, in the present embodiment, the optical assembly 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 indexes and at least one optical modulation film 114. In the present embodiment, the optical films 112 include 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 the present embodiment, the optical film stack 110 is composed of a first optical film 112_1, two second optical films 112_2 and an optical modulation film 114, which are stacked from bottom to top sequentially from the optical modulation film 114, the second optical film 112_2, the first optical film 112_1 and the second optical film 112_ 2. In other words, in the present embodiment, the refractive index is sequentially high, low, high and low from bottom to top, but the invention is not limited thereto. It should be noted that, in the present embodiment, the film layer with a relatively small refractive index is disposed on the uppermost layer of the optical film stack 110, that is, the second optical film 112_2 is disposed on the uppermost layer of the optical film stack 110. In an embodiment of the optical film stack having a five-layer stacked structure, the optical modulation 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 112_2 may be sequentially stacked from bottom to top, wherein the optical modulation film 114 may be made of a material identical to that of the second optical film 112_2 or another material having a refractive index smaller than that of the first optical film 112_ 1. In other words, the refractive index is sequentially low, high, low, high and low from bottom to top. In the embodiment, at least one of the optical control films 114 is located between the optical film 112 and the display surface S, but the invention is not limited thereto.

The first optical film 112_1 and the optical modulation film 114 can be Tungsten Trioxide (WO 3) or Niobium pentoxide (Nb) ₂ O ₅ ) And the second optical film 112_2 may be Silicon dioxide (SiO) as an alternative ₂ ). In other words, in the present embodiment, the material of the optical modulation film 114 is the same as the material of the first optical film 112_ 1. In other embodiments, an optical conditioning filmThe material of the first optical film 112_1 and the material of the second optical film 114 can be selected from different materials, and the invention is not limited thereto. Therefore, under the condition of 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 is less than or equal to 1%, and the anti-reflection function is achieved.

The electrode element 120 is correspondingly electrically connected to the optical modulation film 114. Specifically, the electrode elements 120 are, for example, a pair of electrode structures, and are distributed at the edge of the display device 10, or the distribution positions of the electrode elements 120 correspond to a plurality of display pixel positions in the display device 10, and the invention is not limited thereto. In addition, in the present embodiment, the number of the electrode elements 120 and the number of the optical modulation films 114 are the same, for example, one. However, in other embodiments, the same number of electrode elements 120 and optical modulation films 114 may be used, and the invention is not limited thereto. In the embodiment, the electrode element 120 may be triggered by an external physical key or may be activated by being controlled by computer software, but the invention is not limited thereto.

FIG. 2 is a graph of the transmittance of a prior art material for different wavelengths of light at different voltages. Fig. 3 is a graph of the change in optical refractive index of the material of fig. 2 under different heat treatments for different wavelengths. FIG. 4 is a graph of the change in extinction coefficient of the material of FIG. 2 for different wavelengths of light under different thermal treatments. Please refer to fig. 1 to fig. 4. It is noted that The graphs of The material properties in fig. 2 to 4 are articles cited in The Proceedings of SPIE-The International Society for Optical Engineering 8902:24(2013) journal: the Characterization and application of WO3 files for electrochromic devices. The optical modulation film 114 and the first optical film 112_1 of the present embodiment can use the materials taught in fig. 2 to 4, and therefore, the following description will use tungsten trioxide as the material for the optical modulation film 114 and the first optical film 112_ 1. In an embodiment, the material of the optical modulation film 114 and the first optical film 112_1 is tungsten trioxide. The optical modulation film 114 made of tungsten trioxide is adapted to increase the reflectance to the ambient light L by 1% or more by applying a voltage. Specifically, when the electrode element 120 applies different voltages to the optical modulation film 114, the transmittance of the optical modulation film 114 for light with different wavelengths changes with the different voltages, as shown in fig. 2.

In detail, as shown in fig. 2, the X-axis coordinate represents the wavelength of ambient light in nanometers. The Y-axis coordinate represents the transmission of ambient light, shown as a percentage. Line segment 201 represents the transmittance of the optical modulation film 114 for light of different wavelengths when no voltage is applied to the optical modulation film 114 by the electrode element 120. Line segment 202 represents the transmittance of the optical modulating film 114 for light of different wavelengths when a voltage of 1 volt is applied to the optical modulating film 114 by the electrode element 120. Line 203 represents the transmittance of the optical modulation film 114 for light of different wavelengths when a voltage of 2 volts is applied to the optical modulation film 114 by the electrode element 120. Line 204 represents the transmittance of the optical modulation film 114 for light of different wavelengths when a voltage of 3 volts is applied to the optical modulation film 114 by the electrode element 120. Line segment 205 shows the transmittance of the optical modulation film 114 for light of different wavelengths when a voltage of 4 volts is applied to the optical modulation film 114 by the electrode element 120. Line segment 206 shows the transmittance of the optical modulation film 114 for light of different wavelengths when a voltage of 5 volts is applied to the optical modulation film 114 by the electrode element 120.

In other words, the optical modulation film 114 has different transmittances for different wavelengths of light with different voltages due to the change of the refractive index or extinction coefficient of the optical modulation film 114. In some embodiments, different processes may be performed during the fabrication of the optical modulation film 114 according to different requirements. For example, as shown in fig. 3 and 4, in fig. 3, the X-axis coordinate represents the wavelength of ambient light in nanometers. The Y-axis coordinate represents the index of refraction for ambient light. In fig. 4, the X-axis coordinate represents the wavelength of ambient light in nanometers. The Y-axis coordinate represents the extinction coefficient to ambient light. Line segment 301 represents the refractive index of the optical conditioning film 114 for light of different wavelengths before being subjected to the thermal processing treatment. Line segment 302 represents the refractive index of the optical modulation film 114 for light of different wavelengths after being thermally processed at 400 degrees celsius. Line segment 401 represents the extinction coefficient of the optical conditioning film 114 for light of different wavelengths before the thermal processing. Line segment 402 represents the extinction coefficient of the optical conditioning film 114 for light of different wavelengths after being thermally processed at 400 degrees celsius.

Therefore, as shown in fig. 2, the property of the optical modulation film 114 that the transmittance can be changed by applying different voltages and the property of the optical modulation film 114 that the refractive index and the extinction coefficient can be changed by applying different thermal processes shown in fig. 3, in the optical assembly 100, the voltage can be applied to the optical modulation film 114 through the electrode element 120, so that the refractive index of the optical modulation film 114 can be changed to generate the transmittance for the light with different wavelengths, and further, the function of generating the anti-reflection for the ambient light L can be cancelled, so that the user cannot obtain clear image information from the display surface S of the display device 10. In other words, the optical modulation film 114 to which a voltage is applied can also provide a privacy effect. In this way, the refractive index and the extinction coefficient of the optical modulation film 114 can be controlled by controlling the electrode element 120 to switch between the anti-reflection function and the non-anti-reflection function under different situations, so as to achieve a good optical display effect or a good anti-peeping effect. In addition, compared with the common electrochromic material, the present embodiment can further save the components required for disposing the electrochromic material such as the electrolyte.

It is to be noted that when the optical control film 114 is formed using tungsten trioxide, dark blue can be generated by applying a voltage. In some embodiments, the optical modulating film 114 may be fabricated using molybdenum oxide, niobium oxide, or titanium oxide. Thus, different non-transparent colors can be produced by being applied with a voltage. Therefore, the peep-proof effect of the display surface S can be further improved.

In summary, in the optical assembly of the present invention, the optical film stack of the optical assembly is composed of a plurality of optical films with different refractive indexes and at least one optical modulation film. Therefore, the anti-reflection function can be generated under the general condition, and the display device achieves good optical display effect. The optical regulating film can change the refractive index and the extinction coefficient through controlling the electrode element. Therefore, the anti-reflection function or the non-anti-reflection function can be switched under different situations, and further a good optical display effect or a good peeping prevention effect is achieved.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. An optical accessory for being disposed on a display surface of a display device, comprising:

the optical film stack comprises a plurality of optical films with different refractive indexes and at least one optical regulation and control film; and

the optical film stack is electrically connected with the at least one optical regulation and control film correspondingly, wherein the reflectivity of the optical film stack to the ambient light is less than or equal to 1%, and the at least one optical regulation and control film is suitable for increasing the reflectivity to the ambient light by being applied with voltage, so that the reflectivity of the ambient light is greater than or equal to 1%.

2. The optical accessory of claim 1, wherein the at least one optical conditioning film increases reflectivity to the ambient light by changing a refractive index or an extinction coefficient.

3. The optical accessory of claim 1, wherein the number of the at least one optical modulating film is the same as the number of the at least one electrode element.

4. The optical assembly of claim 1, wherein the number of the at least one optical modulation film and the number of the at least one electrode element are both one.

5. The optical assembly of claim 1, wherein at least one of the at least one optical conditioning film is positioned between the plurality of optical films and the display surface.

6. The optical accessory of claim 1, wherein the plurality of optical films includes at least one first optical film and at least one second optical film that are cross-stacked, the at least one first optical film having a refractive index greater than the at least one second optical film.

7. The optical assembly of claim 1, wherein the at least one optical conditioning film is the same material as 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 removably disposed on the display device.