CN117687205A

CN117687205A - Optical film, display device, head-up display and traffic equipment

Info

Publication number: CN117687205A
Application number: CN202211053974.7A
Authority: CN
Inventors: 吴慧军; 徐俊峰
Original assignee: Futurus Technology Co Ltd
Current assignee: Futurus Technology Co Ltd
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2024-03-12

Abstract

The present disclosure relates to an optical film, a display device, a head-up display, and a traffic device. The optical film comprises a film body, wherein the film body comprises a plurality of first laminated structures, the first laminated structures comprise a first refractive index layer and a second refractive index layer which are laminated, the film body is configured to reflect incident light rays with first characteristics, the light rays with the first characteristics comprise at least one spectral band or line, the half-peak width of the at least one spectral band or line is smaller than or equal to 60nm, the reflectivity of the optical film is larger than or equal to a first preset value and smaller than or equal to a second preset value, and the first preset value is smaller than the second preset value; the light rays of the first characteristic are light rays with a P polarization state. The improved optical film is adopted as the transflective film in the display device of the head-up display, so that the overall transmittance of natural light can be improved, and the display effect of the head-up display can be improved.

Description

Optical film, display device, head-up display and traffic equipment

Technical Field

The present disclosure relates to an optical film, a display device, a head-up display, and a traffic device.

Background

Related art through with the light projection that the image source of HUD (Head Up Display) sent on imaging window (imaging plate of afterloading or windshield window of vehicle etc.), the user need not the low Head just can directly see the picture to can improve user experience.

Disclosure of Invention

The disclosure provides an optical film, a display device, a head-up display and traffic equipment, and the head-up display can have a good display effect.

According to one aspect of the present disclosure, there is provided an optical film comprising:

a film body comprising a plurality of first stacked structures including a first refractive index layer and a second refractive index layer stacked, the film body configured to reflect incident light of a first characteristic, the light of the first characteristic including at least one spectral band or line having a half-peak width of less than or equal to 60nm, the optical film having a reflectivity greater than or equal to a first preset value and less than or equal to a second preset value, the first preset value being less than the second preset value; the light rays of the first characteristic are light rays with a P polarization state.

In some embodiments of the disclosure, the refractive index of the first refractive index layer is higher than the refractive index of the second refractive index layer, and the refractive index of the first refractive index layer ranges from 1.9 to 2.7, and the refractive index of the second refractive index layer ranges from 1.3 to 1.9.

In some embodiments of the present disclosure, the refractive index of the first refractive index layer ranges from 2 to 2.5, and the refractive index of the second refractive index layer ranges from 1.40 to 1.49.

In some embodiments of the present disclosure, the light rays of the first characteristic include a first light component, a second light component, and a third light component having different wavelength ranges.

In some embodiments of the present disclosure, the first light component has a wavelength ranging from 410nm to 490nm, and/or the second light component has a wavelength ranging from 510nm to 570nm, and/or the third light component has a wavelength ranging from 580nm to 670nm.

In some embodiments of the present disclosure, the first light component has a wavelength ranging from 420nm to 460nm, and/or the second light component has a wavelength ranging from 520nm to 560nm, and/or the third light component has a wavelength ranging from 590nm to 630nm.

In some embodiments of the present disclosure, the first preset value ranges from 7% to 35%, and the second preset value ranges from 10% to 35%.

In some embodiments of the present disclosure, the film body further comprises at least one second laminate structure comprising an infrared isolation layer and a first refractive index layer in a laminated arrangement.

In some embodiments of the present disclosure, the optical film has a transmittance of less than or equal to 30% for incident infrared light.

In some embodiments of the present disclosure, the infrared isolation layer includes a silver-containing layer, and the thickness of the infrared isolation layer has a value in the range of 20nm to 25nm.

In some embodiments of the present disclosure, the thickness of the first refractive index layer ranges from 5nm to 100nm, and the thickness of the second refractive index layer ranges from 10nm to 120nm.

In some embodiments of the present disclosure, the thickness of the first refractive index layer ranges from 6nm to 80nm, and the thickness of the second refractive index layer ranges from 16nm to 115nm.

In some embodiments of the present disclosure, the optical film has a transmittance of greater than or equal to 70% for light rays not having the first characteristic, and/or has a reflectance of 30% -35% for light rays having the first characteristic at an incident angle in a set angle range of 35-75 degrees.

In some embodiments of the present disclosure, the light of the first characteristic includes at least three spectral bands or lines having a half-peak width of less than or equal to 60nm, the at least three spectral bands or lines corresponding to different wavelengths.

In some embodiments of the present disclosure, the optical film has a reflectivity of 10% to 50% for each of the at least three spectral bands or lines, or the optical film has a reflectivity of 25% to 35% for each of the at least three spectral bands or lines.

According to an aspect of the present disclosure, there is provided a display device including:

a plurality of transparent substrates stacked;

at least one intermediate layer, wherein at least one of the at least one intermediate layer is disposed between every two adjacent transparent substrates of the plurality of transparent substrates; and

at least one transflective film disposed at least one of two first positions and a plurality of second positions, the first position being a surface of the transparent substrate away from the intermediate layer, the second position being a surface of the transparent substrate near the intermediate layer, the transflective film being an optical film as described in any of the embodiments above.

In some embodiments of the present disclosure, at least one of the transparent substrates in the plurality of transparent substrates is a first transparent substrate, the at least one transflective film includes a first film and a second film, the first film is located on a first surface of the first transparent substrate, the second film is located on a second surface of the first transparent substrate, and a thickness of the first transparent substrate is less than a predetermined thickness.

In some embodiments of the present disclosure, the predetermined thickness has a range of values less than or equal to 1.5mm.

In some embodiments of the present disclosure, at least one of the transparent substrate or the intermediate layer between two adjacent transflective films is a wedge-shaped structure.

In some embodiments of the present disclosure, the display device further includes:

the image source outputs the light rays with the first characteristics, the light rays with the first characteristics are P polarized light rays, and the half-width of at least one spectral band or spectral line of the light rays with the first characteristics is smaller than or equal to 60nm.

In some embodiments of the present disclosure, the light rays of the first characteristic include a first light component, a second light component and a third light component having different wavelengths,

the first light component has a wavelength ranging from 410nm to 490nm, and/or the second light component has a wavelength ranging from 520nm to 560nm, and/or the third light component has a wavelength ranging from 590nm to 630nm.

In some embodiments of the present disclosure, the first light component has a wavelength in the range of 420nm to 460nm.

In some embodiments of the present disclosure, the plurality of transparent substrates is two transparent substrates, the two transparent substrates comprising: the first transparent substrate and the second transparent substrate, the plurality of second positions are two second positions, the first position comprises a surface of the first transparent substrate far away from the middle layer and a surface of the second transparent substrate far away from the middle layer, and the second position comprises a surface of the first transparent substrate close to the middle layer and a surface of the second transparent substrate close to the middle layer.

In some embodiments of the present disclosure, the transflective film includes two transflective films disposed at any two of the two first positions and the two second positions, respectively, or the transflective film includes three transflective films disposed at any three of the two first positions and the two second positions, respectively, or the transflective film includes four transflective films disposed at the two first positions and the two second positions, respectively.

According to one aspect of the present disclosure, there is provided a windshield comprising:

a plurality of transparent substrates stacked;

According to one aspect of the present disclosure, there is provided a head-up display comprising an image source and a windscreen as described in any of the embodiments above, or comprising a display device as described in any of the embodiments above.

According to one aspect of the present disclosure, there is provided a traffic device comprising a head-up display as described in any one of the embodiments above.

The optical film disclosed by the disclosure is used as a transflective film in a display device of a head-up display, so that the overall transmittance of natural light can be improved, and the display effect of the head-up display can be improved. In some embodiments, the present disclosure may also reduce power consumption of the image source.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

FIG. 1 is a schematic view of some embodiments of a related art windshield.

Fig. 2 is a schematic diagram of some embodiments of an optical film of the present disclosure.

Fig. 3 is a schematic view of other embodiments of the optical film of the present disclosure.

Fig. 4 is a schematic diagram of some embodiments of a display device of the present disclosure.

Fig. 5 is a schematic diagram of other embodiments of a display device of the present disclosure.

Fig. 6 is a schematic diagram of still other embodiments of a display device of the present disclosure.

Fig. 7 is a schematic diagram of still other embodiments of a display device of the present disclosure.

Fig. 8 is a schematic diagram of still other embodiments of a display device of the present disclosure.

Fig. 9 is a schematic diagram of still other embodiments of a display device of the present disclosure.

Fig. 10 is a schematic diagram of some embodiments of a head-up display of the present disclosure.

Detailed Description

The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless it is specifically stated otherwise.

Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

FIG. 1 is a schematic view of some embodiments of a related art windshield. As shown in fig. 1, the glass comprises a first glass plate 301, a second glass plate 303 and an interlayer 302 sandwiched between the first glass plate 301 and the second glass plate 303, wherein the interlayer 302 is a PVB layer, and the function of the interlayer is mainly to achieve the gluing between the first glass plate 301 and the second glass plate 303. The related art windshields are applied to a head-up display, and can be used to reflect image light so that a user can see a virtual image, but such head-up display has a problem in that its imaging effect is poor, resulting in a reduced viewing experience for the user. Poor imaging may include at least one of: imaging includes ghosting resulting in insufficient sharpness; imaging brightness is insufficient, or higher power is required under the same brightness, so that energy waste is caused; in some situations (such as when the user wears polarized sunglasses), the user cannot see the image; etc.

In addition, the windshield in the related art has the problems of high production cost, complex process and the like.

In view of at least one of the above technical problems, the present disclosure provides an optical film, a display device, a head-up display, and a traffic device, and is described below by way of specific embodiments.

Fig. 2 is a schematic diagram of some embodiments of an optical film of the present disclosure. As shown in fig. 2, the optical film of the present disclosure may include a film body 1, wherein:

the film body 1 may include a plurality of first laminated structures 10, a plurality of which refers to at least two in the present disclosure. The first laminated structure 10 includes a first refractive index layer 11 and a second refractive index layer 12 which are laminated. The film body 1 is configured to reflect incident light of a first characteristic, the light of the first characteristic comprising at least one spectral band or line having a half-peak width of less than or equal to 60nm, the optical film having a reflectivity of greater than or equal to a first preset value and less than or equal to a second preset value, the first preset value being less than the second preset value; the light rays of the first characteristic are light rays with a P polarization state.

The optical film has an effect of reflecting light rays of the first characteristic by combining the first refractive index layer 11 and the second refractive index layer 12 which are laminated. The aforementioned light rays of the first characteristic may be light rays having a P polarization state, and furthermore, the light rays of the first characteristic may have a narrow band characteristic, which is understood to be light rays comprising at least one spectral band or line having a half-peak width of less than or equal to 60nm. The optical film may be applied to a windshield (e.g., a vehicle's windshield) such that the windshield with the optical film reflects image light of a heads-up display to enable a user to see a virtual image.

Because the optical film has better reflectivity for the first characteristic and narrow-band light rays, and better transmissivity for other characteristic light rays or non-narrow-band light rays, the optical film can be used for ensuring better imaging effect (such as higher brightness), the required energy is not required to be additionally increased, and in addition, the overall transmissivity of the wind shield window can meet the requirement of more than or equal to 70 percent.

In addition to the above effects, the optical film reflects P-polarized light to the eye box, so that a virtual image can be seen when a user wears a polarized sunglasses (which prevents glare by filtering S-polarized light), thereby having a better viewing experience.

In some embodiments of the present disclosure, as shown in fig. 2, a plurality of first stacked structures 10 are stacked together. The first refractive index layer 11 and the second refractive index layer 12 may have an equal thickness structure, that is, the cross sections of the first refractive index layer 11 and the second refractive index layer 12 are rectangular. The inventor researches find that in the process that light enters the optical film and propagates in the optical film, the refractive index layers with different refractive indexes and different thicknesses can generate different diffraction and reflection on components with different wavelengths in the light, so that the whole light film has higher reflectivity or transmittance on the light with certain characteristics. In this example, the first refractive index layer 11 and the second refractive index layer 12 with equal thickness are more convenient to process, and the reflectivity of the light rays with the first characteristic at different positions of the optical film is more uniform, which is helpful to improving the imaging effect.

It should be noted that the equal thickness in this embodiment should be understood as the same that can be achieved by the industrial technology, and a certain error is allowed, and is not limited to the strict equal thickness.

In some embodiments of the present disclosure, the refractive index of the first refractive index layer 11 is higher than the refractive index of the second refractive index layer 12, and the refractive index of the first refractive index layer 11 ranges from 1.9 to 2.7, and the refractive index of the second refractive index layer 12 ranges from 1.3 to 1.9. The refractive index range can achieve a good reflection effect, and the processing cost is low.

For example, the refractive index of the first refractive index layer 11 ranges from 2 to 2.5, and the refractive index of the second refractive index layer 12 ranges from 1.40 to 1.49. The optical film with the refractive index range can realize the required reflectivity (such as the reflectivity between a first preset value and a second preset value) by adopting fewer refractive index layers, thereby reducing the processing cost.

In some examples, the first refractive index layer 11 may be tantalum pentoxide and the second refractive index layer 12 may be silicon dioxide. But is not limited thereto, in other examples, the first refractive index layer 11 may be selected from at least one of an oxide of Zn, sn, ti, nb, zr, ni, in, al, ce, W, mo, sb, bi element and a mixture thereof, or a nitride of Si, al, zr, Y, ce, la element, oxynitride and a mixture thereof. The second refractive index layer 12 may be selected from at least one of an oxide of Si or Al, an oxynitride, or a mixture thereof.

In some embodiments of the present disclosure, the thickness of the first refractive index layer 11 ranges from 5nm to 100nm, and the thickness of the second refractive index layer 12 ranges from 10nm to 120nm. The reflectivity of the optical film can be satisfied by the cooperation of the first refractive index layer 11 and the second refractive index layer 12 having different thicknesses and refractive indices. For example, the reflectivity of the light with the first characteristic is set between a first preset value and a second preset value, and the transmittance of the wind shielding window with the light is set to be more than or equal to 70%.

In some embodiments of the present disclosure, the thickness of the first refractive index layer 11 ranges from 6nm to 80nm, and the thickness of the second refractive index layer 12 ranges from 16nm to 115nm. The processing difficulty of the first refractive index layer 11 and the second refractive index layer 12 of these thickness ranges is relatively low, contributing to cost reduction.

It should be noted that the thicknesses of the first refractive index layers 11 in the different first laminated structures 10 of the optical film may be at least partially different; the thicknesses of the second refractive index layers 12 in the different first stacked structures 10 may be at least partially different.

In some embodiments of the present disclosure, the thickness of the second refractive index layer 12 may be 105nm, 43nm, 16nm, 112nm, etc. in the plurality of first stacked structures 10 from top to bottom as shown in fig. 2; the thickness of each first refractive index layer 11 may be 10nm, 75nm, 19nm, 40nm, etc., respectively, but is not limited thereto.

In some embodiments of the present disclosure, in order to enable the light reflected into the eye-box area to meet the viewing requirement, the brightness of the virtual image is made higher, the value range of the first preset value is 7% -35%, and the value range of the second preset value is 10% -35%. The optical film with the reflectivity in the range can ensure better reflection of the light rays with the first characteristic, and the transmittance of the wind shielding window is not lower than 70%.

The optical film of the above embodiments of the present disclosure can realize a narrow-band polarization transflective film.

Alternatively, as shown in fig. 3, the film body 1 may further include at least one second laminated structure 20, the second laminated structure 20 including an infrared isolation layer 21 and a first refractive index layer 11 which are laminated, in addition to the aforementioned first laminated structure. Through setting up infrared isolation layer to reduce infrared transmissivity, realize thermal-insulated effect, and can not influence the transmissivity of fender wind window to the visible light.

In some embodiments of the disclosure, the optical film has a transmittance of less than or equal to 30% for incident infrared light, so as to achieve a better heat insulation effect, and the optical film can prevent the temperature in a vehicle from being too high through heat insulation, and has a certain protection effect on electronic devices such as an image source of a head-up display, and prevent the service life of the electronic devices from being influenced by the too high internal temperature.

In some embodiments of the present disclosure, the infrared isolation layer 21 may include a silver-containing layer, and the thickness of the infrared isolation layer 21 may have a value ranging from 20nm to 25nm, so as to reduce the production cost as much as possible while implementing heat insulation, and avoid adversely affecting the reflectivity of the light of the first characteristic.

In some embodiments of the present disclosure, the light of the first characteristic may be light of a particular polarization state and/or within a predetermined band of wavelengths.

For example, the light rays with the first characteristic include a first light component, a second light component and a third light component with different wavelength ranges, and the effect of imaging the light rays with the first characteristic is similar to the effect of natural light imaging through the combination of the light components with different wavelength ranges, so that when the human eyes watch the light rays with the first characteristic, the color of a virtual image formed by the light rays with the first characteristic is natural, and the watching effect is better.

In some embodiments of the present disclosure, the first light component has a wavelength ranging from 410nm to 490nm, and/or the second light component has a wavelength ranging from 510nm to 570nm, and/or the third light component has a wavelength ranging from 580nm to 670nm. The light rays of the first characteristic of the combination of the light components in the wavelength ranges can ensure the natural color of the virtual image and can lead the reflectivity of the optical film to be higher. The light rays of the first characteristic may include a light component of a single wavelength within the aforementioned wavelength range or a light component of a wavelength band within the aforementioned wavelength range.

In some embodiments of the present disclosure, the first light component has a wavelength ranging from 420nm to 460nm, and/or the second light component has a wavelength ranging from 520nm to 560nm, and/or the third light component has a wavelength ranging from 590nm to 630nm, so as to achieve a better imaging effect.

The light rays with the first characteristic comprise at least three spectral bands or lines with half-peak widths smaller than or equal to 60nm, and the wavelengths corresponding to the at least three spectral bands or lines are different. For example, the wavelengths corresponding to the at least three spectral bands or lines are the wavelengths corresponding to the aforementioned first to third light components, respectively. The optical film has higher reflectivity for narrow-band light rays with half peak width smaller than or equal to 60nm and higher transmissivity for non-narrow-band light rays, so that the transmissivity of the traffic light is not influenced.

To enhance imaging brightness, the display color is more natural, and the optical film has a reflectivity of 10% to 50%, and in some preferred examples, 25% to 35%, for each of the at least three spectral bands or lines.

The first light component presents color which deviates from blue light, the second light component presents color which deviates from green light, the third light component presents color which deviates from red light, the reflectivity of the optical film to three lights of red light, green light and blue light is about 30 percent, so that the color of a virtual image is ensured to be matched with the color required to be displayed, and the color deviation problem is reduced.

In some embodiments of the present disclosure, the specific polarization state is a horizontal polarization state (e.g., may be a P polarization state), and the narrow-band polarization transflective film has a higher reflectivity for red light, green light, and blue light of the P polarization state, and a higher transmissivity for light of other bands and red light, green light, and blue light of the S polarization state (e.g., a transmissivity of about 70% -90%), so that an imaging effect is ensured without affecting the overall transmissivity.

The optical film of the above embodiment of the present disclosure is a narrow-band polarized transflective film, and may reflect light rays of a specific polarization state and/or a specific wavelength band (e.g., red light, green light, and blue light), so as to implement imaging of head-up display.

In some embodiments of the present disclosure, the optical film has a transmittance of greater than or equal to 70% for light rays having no first characteristic, and/or has a reflectance of 30% -35% for light rays having the first characteristic with an incident angle within a set angle range, and the set angle range is 35 degrees to 75 degrees, so as to improve the display effect of the virtual image (e.g., improve brightness without increasing power) while ensuring the transmittance of the windshield.

The optical film of the embodiment of the disclosure can be applied to a display device in a head-up display or a transflective film of a windshield.

The optical film disclosed by the embodiment of the disclosure is a narrow-band RGB (red, green and blue) transflective film, and has the technical effects that the reflectivity of the transflective film to the light in the P polarization state of the wavelength corresponding to the narrow-band RGB is high, so that the virtual image is ensured to have high brightness, the virtual image is clear, the transmittance of ambient light is higher, the national standard requirement can be met, and the observation environment is not influenced.

In some embodiments of the present disclosure, the total number of first stacked structures is less than or equal to 25 (i.e., the total number of layers is less than or equal to 50).

In other embodiments of the present disclosure, the first laminate structure is less than or equal to 15, for example, 10 layers. The film layer of the embodiment of the disclosure has lower thickness, lower processing cost and lowest cost under the condition of ensuring the effect.

In some embodiments of the present disclosure, the optical film has a transmittance greater than a predetermined transmittance for light of a polarization state other than the specific polarization state and a transmittance greater than a predetermined transmittance for light of the specific polarization state and/or outside a predetermined band range.

In some embodiments of the present disclosure, the optical film has a higher reflectivity for narrowband light having a particular polarization state (having at least one band), and a higher transmissivity for light in other bands within the visible band, as well as narrowband light of other polarization states.

In some embodiments of the present disclosure, the particular polarization state is the polarization state of light emitted by the image source.

In some embodiments of the present disclosure, the particular polarization state may be a horizontal polarization state (P-polarization state).

In some embodiments of the present disclosure, the first refractive index layer 11 and the second refractive index layer 12 may be deposited by physical vapor deposition (e.g., evaporation, sputtering) or chemical vapor deposition methods known to those skilled in the art, preferably horizontal magnetron sputtering. The original glass of the transparent substrate enters a sputtering coating line provided with a plurality of coating cathodes after pretreatment, cleaning and other working procedures, and each film layer is deposited in sequence according to a plurality of first laminated structures 10 in the film main body 10 and the thickness design thereof; and (5) performing high-temperature forming and lamination after coating.

The improved optical film is adopted as the transflective film in the display device of the head-up display, so that the overall transmittance of natural light can be improved, and the display effect of the head-up display can be improved.

In some embodiments of the present disclosure, the optical film of the present disclosure may further comprise a low surface energy film layer, wherein:

the low surface energy film layer can be coated and laid on the surface of the film main body 1 before or after lamination, and comprises the steps of surface cleaning, coating (spray coating, dip coating, painting) and drying.

In some embodiments of the present disclosure, the low surface energy film layer may be a protective film.

In some embodiments of the present disclosure, the protective film may be an anti-fingerprint film.

The anti-fingerprint film arranged on the polarization selective transflective film can play a role in protecting an optical film (the polarization transflective film), so that the polarization transflective film is prevented from being damaged due to external factors (such as artificial scratch), the protectiveness of the polarization transflective film is improved, and the anti-fingerprint film has oleophobic, hydrophobic and scratch-resistant performances.

According to one aspect of the present disclosure, there is provided a display device (e.g. a windscreen of the embodiment of fig. 1) comprising:

a plurality of transparent substrates, such as the first glass plate 301 and the second glass plate 303 of the embodiment of fig. 1, are stacked.

At least one intermediate layer (e.g., intermediate layer 302 of the embodiment of fig. 1), wherein at least one of the at least one intermediate layer is disposed between each two adjacent transparent substrates of the plurality of transparent substrates; and

at least one transflective film (e.g., the optical film of the embodiment of fig. 2 or 3) is disposed in at least one of two first locations, the surface of the transparent substrate distal from the intermediate layer, and a plurality of second locations, the surface of the transparent substrate proximal to the intermediate layer, and at least one of the transflective films may be any of the optical films described above.

In some embodiments of the present disclosure, at least one of the transparent substrates is a first transparent substrate, the at least one transflective film includes a first film and a second film, the first film is positioned on a first surface of the first transparent substrate, the second film is positioned on a second surface of the first transparent substrate, and a thickness of the first transparent substrate is less than a predetermined thickness to reduce a ghost problem, and at least one of the first film and the second film is the aforementioned optical film.

In some embodiments of the present disclosure, the predetermined thickness has a value ranging from less than or equal to 1.5mm, and the virtual image has better definition due to the smaller predetermined thickness.

Fig. 4 is a schematic diagram of some embodiments of a display device of the present disclosure. As shown in fig. 4, the present disclosure may include a plurality of transparent substrates 301, 303, at least one intermediate layer 302, and a multilayer transflective film 401, 402, wherein:

the transparent substrates are stacked; and an intermediate layer is disposed between each two adjacent transparent substrates of the plurality of transparent substrates.

Thus, if the number of transparent substrates is N, where N is a natural number equal to or greater than 2, the number of intermediate layers is N-1. For example: the display device of the embodiment of fig. 4 comprises two transparent substrates 301, 303 and an intermediate layer 302.

In some embodiments of the present disclosure, the multilayer transflector film may be disposed in at least two different locations of two first locations, the surface of the transparent substrate remote from the intermediate layer, and a plurality of second locations, the surface of the transparent substrate proximate to the intermediate layer.

Since the number of intermediate layers is N-1 when the number of transparent substrates is N, it can be seen that the number of second positions is 2N-2 and the total number of first and second positions is 2N. Therefore, the number of layers of the transflective film is in the range of [2,2N ].

In some embodiments of the present disclosure, the minimum number of layers of the transflector film is 2.

In some embodiments of the present disclosure, the maximum number of layers of the transflective film is 2 times the number of transparent substrates, i.e., 2N.

For example: the display device of the embodiment of fig. 4 comprises two transparent substrates 301, 303 and one intermediate layer 302, the number of second positions being 2 and the total number of first positions and second positions being 4. Therefore, the number of the transflective films ranges from [2,4].

In the above embodiments of the disclosure, if the number of layers of the transflective film is greater, the number of reflection times of the light can be increased, so that the total amount of the reflected light is increased, and the brightness of the light is increased.

In the above embodiments of the disclosure, if the number of the transflective films is smaller, the ghost problem is smaller, the cost is lower, and the process is easier.

The number of layers and the position of each layer of the transflective film in the above embodiments of the present disclosure may be selected according to actual requirements.

In some embodiments of the present disclosure, the display device of the present disclosure may be an imaging window, such as a afterloaded imaging panel or a windshield window of a vehicle, or the like.

In some embodiments of the present disclosure, the transparent substrate may be a glass plate.

In some embodiments of the present disclosure, the transparent substrate may include at least two glass substrates having a curvature.

In some embodiments of the present disclosure, the intermediate layer may be a thermoplastic polymer film sheet.

In some embodiments of the present disclosure, the interlayer can be a PVB (Polyvinyl Butyral ) layer.

In some embodiments of the present disclosure, as shown in fig. 4, the display device includes a first transparent substrate 301, a second transparent substrate 303, and an interlayer 302 sandwiched between the first transparent substrate 301 and the second transparent substrate 303, where the interlayer 302 is a PVB layer, and the function of the interlayer is mainly to achieve gluing between the first transparent substrate 301 and the second transparent substrate 303.

It should be noted that, for convenience of description, in the present disclosure, the surfaces of the display device from the first transparent substrate 301, the intermediate layer 302 to the second transparent substrate 303 are 1-sided (i.e., the first surface), 2-sided (i.e., the second surface), 3-sided, and 4-sided in order, where 1-sided and 4-sided are the first position, and 2-sided and 3-sided are the second position.

In some embodiments of the present disclosure, as shown in fig. 4, the plurality of transparent substrates is two transparent substrates, the two transparent substrates including: the first transparent substrate 301 and the second transparent substrate 303 are two second positions, the first position includes a surface (1 face) of the first transparent substrate 301 away from the intermediate layer 302, and a surface (4 faces) of the second transparent substrate 303 away from the intermediate layer 302, and the second position includes a surface (2 faces) between the first transparent substrate 301 and the intermediate layer 302, and a surface (3 faces) of the second transparent substrate 303 and the intermediate layer 302.

In some embodiments of the present disclosure, the multilayer transflector film is a two-layer transflector film disposed in any two of two first locations and two second locations, respectively.

In some embodiments of the present disclosure, for the case where two layers of transflective films are provided in a display device, the two layers of transflective films may be provided on the 1-side and 2-side as shown in the embodiments of fig. 4 and 5; two layers of transflective film may be provided on sides 2 and 3 as shown in the embodiments of fig. 6 and 7; two layers of transflective films can be arranged on the 1 side and the 3 side; two layers of transflective films can be arranged on the 1 side and the 4 side; two layers of transflective films can be arranged on the 2 side and the 4 side; two layers of transflective film may be provided on the 3-side and 4-side.

In some embodiments of the present disclosure, the multilayer transflector film is a three-layer transflector film disposed in any three of two first locations and two second locations, respectively.

In some embodiments of the present disclosure, for the case where three layers of transflective films are provided in a display device, the three layers of transflective films may be provided on 1 side, 2 side, and 3 side, as shown in the embodiment of fig. 8; the three layers of the transflective film can be arranged on the 2 side, the 3 side and the 4 side; the three layers of the transflective film can be arranged on the 1 side, the 3 side and the 4 side; three layers of transflective films may be provided on sides 1, 2 and 4.

The three layers of the transflective films are arranged in the embodiment of the disclosure, so that the number of layers of the transflective films is large, the reflection times of light rays can be further increased, the total quantity of the reflected light rays is increased, and the brightness of the light rays is increased.

In some embodiments of the present disclosure, the multilayer transflector film is a four-layer transflector film disposed in two first locations and two second locations, respectively. That is, the transflective film is provided on each of the 1-side, 2-side, 3-side, and 4-side.

The four layers of the transparent and reflecting films are arranged in the embodiment of the disclosure, and the maximum number of layers of the transparent and reflecting films is achieved for the embodiment of the two layers of transparent substrates, so that the reflection times of light rays can be further increased, the total quantity of the reflected light rays is increased, and the brightness of the light rays is increased.

In some embodiments of the present disclosure, the transflective film may be a polarizing transflective film.

In some embodiments of the present disclosure, the transflective film (described in any of the embodiments of fig. 1, 4-10) may be implemented as an optical film described in any of the embodiments of the present disclosure (e.g., the embodiment of fig. 2 or 3).

In some embodiments of the present disclosure, the transflective film has a transmittance for light of a polarization state other than a particular polarization state and/or wavelength range that is greater than a predetermined transmittance.

In some embodiments of the present disclosure, the transflective film has a transmission of 70% to 90% for light of other polarization states than a particular polarization state and/or wavelength range. In order to ensure that the transmittance of the windshield satisfies the requirements when the transparent film is applied to the windshield, the total transmittance of the transflective film arranged on the windshield is more than or equal to 70 percent. For example, in the case where at least two layers of the transflective film are coated on the windshield, the total transmittance of the at least two layers of the transflective film together is 70% or more.

In some embodiments of the present disclosure, the particular polarization state is a horizontal polarization state (P-polarization state).

In some embodiments of the present disclosure, the display device (e.g., the display device described in any of the embodiments of fig. 4-9) may further include an image source, wherein:

the image source outputs the light rays with the first characteristic, the light rays with the first characteristic are P polarized light rays, and the half-width of at least one spectral band or spectral line of the light rays with the first characteristic is smaller than or equal to 60nm. The light rays with the first characteristic output by the image source can be matched with the optical film, so that the image light rays (the image light rays also have the first characteristic) of the light rays by the image source can fully utilize the characteristics of the optical film, and the imaging effect is improved.

the first light component has a wavelength ranging from 410nm to 490nm, and/or the second light component has a wavelength ranging from 520nm to 560nm, and/or the third light component has a wavelength ranging from 590nm to 630nm. The virtual image formed by the light mixed by the light components has natural display color and can be effectively reflected by the optical film.

In some embodiments of the present disclosure, in order to achieve a better display color, the wavelength of the first light component has a value ranging from 420nm to 460nm.

The image source light of the above-described embodiments of the present disclosure is RGB (red green blue) mixed.

In some embodiments of the present disclosure, as shown in fig. 4, in order to avoid the ghost problem, the first transparent substrate 301 may be configured as a thin transparent substrate (for example, a thickness <1.5 mm), and the light path of the light propagating in the first transparent substrate 301 is shorter due to the thinner thickness of the first transparent substrate 301, so that the offset effect of the light caused by refraction may be reduced.

In some embodiments of the present disclosure, at least one of the transparent substrate or the intermediate layer between each adjacent two of the multilayer transflector films is a wedge structure.

The present disclosure reduces the offset of the light reflected by the two surfaces due to the non-parallelism of the two surfaces of the first transparent substrate 301 of the wedge structure, so that the occurrence of the ghost problem can be avoided or reduced.

Fig. 6 is a schematic diagram of still other embodiments of a display device of the present disclosure. Fig. 7 is a schematic diagram of still other embodiments of a display device of the present disclosure.

In some embodiments of the present disclosure, the image source may emit polarized light (e.g., P polarized light), and the 2 and 3 sides of the display device are respectively coated with a polarizing transflector film of the same type as the light of the image source. For example: as shown in fig. 6 and fig. 7, if the image source can emit P polarized light, the first P polarized light transmitting and reflecting film 401 and the second P polarized light transmitting and reflecting film 402 are respectively coated on the 2 and 3 sides of the display device, so that the brightness of the virtual image can be further improved.

In some embodiments of the present disclosure, since P-polarized light is incident on the display device, the P-polarized light is reflected at 2 and 3 sides, respectively, where a polarization transreflective film (e.g., a P-polarization transreflective film) is disposed, thereby forming ghost images. As shown in fig. 6 and 7, the intermediate layer 302 may be set to be thin (typically, about 1 mm), so that the ghost effect is not significant. Since the thickness of the intermediate layer 302 is thin, the optical path of light propagating in the intermediate layer 302 is short, so that the offset influence of light due to refraction can be reduced, and thus the ghost problem can be avoided.

In some embodiments of the present disclosure, as shown in fig. 7, the first intermediate layer 302 between the first P-polarized transflector 401 and the second P-polarized transflector 402 is provided in a wedge structure, and the offset of the light reflected by the two surfaces is reduced due to the non-parallelism of the two surfaces of the intermediate layer 302 in the wedge structure, so that the ghost problem can be further avoided.

According to the embodiment of the disclosure, on the basis of at least double-layer coating, a corresponding ghost elimination scheme can be set, so that the definition of an image is improved.

Fig. 8 is a schematic diagram of still other embodiments of a display device of the present disclosure. Fig. 9 is a schematic diagram of still other embodiments of a display device of the present disclosure.

In some embodiments of the present disclosure, as shown in fig. 8 and 9, the image source may emit polarized light, and the 1, 2, and 3 sides of the display device are respectively coated with a polarization transreflective film of the same type as the light of the image source. If the image source can emit P polarized light, P polarized light transmitting and reflecting films with the same type as the light of the image source are respectively plated on the 1, 2 and 3 surfaces of the display device.

The embodiment of the disclosure can increase the reflection times of light on the basis of at least double-layer coating, thereby improving the total quantity of the reflected light and increasing the brightness of the light.

In some embodiments of the present disclosure, further, as shown in fig. 9, in order to avoid the occurrence of the ghost problem, the first transparent substrate 301 may be provided as wedge-shaped glass, and further, the intermediate layer 302 may also be provided as wedge-shaped.

In some embodiments of the present disclosure, as shown in fig. 9, further, in order to avoid the occurrence of the ghost problem, the first transparent substrate 301 may be provided as wedge glass, and the thickness of the first transparent substrate 301 may be provided to be less than a predetermined thickness; further, the intermediate layer 302 may also be provided in a wedge shape, and the thickness of the intermediate layer 302 may be set to be smaller than a predetermined thickness.

Since the thickness of the first transparent substrate 301 is thinner in the above embodiments of the present disclosure, the optical path of light propagating in the first transparent substrate 301 and the intermediate layer 302 is shorter, so that the offset effect of light caused by refraction can be reduced, and thus the ghost problem can be avoided. Meanwhile, since the two surfaces of the first transparent substrate 301 and the intermediate layer 302 of the wedge structure are not parallel, the offset of the light reflected by the two surfaces is reduced, and thus the ghost problem can be further avoided.

a plurality of transparent substrates stacked;

at least one transflective film disposed in at least one of two first locations and a plurality of second locations, the first location being a surface of the transparent substrate away from the intermediate layer and the second location being a surface of the transparent substrate near the intermediate layer, the transflective film being an optical film as described in any of the embodiments (e.g., the embodiments of fig. 2 or 3).

The optical film adopted by the windshield of the embodiment of the disclosure is a narrow-band RGB transflective film, and the transflective film has higher reflectivity to P-polarized light of a wavelength corresponding to narrow-band RGB, so that a virtual image is ensured to have higher brightness, the virtual image is clear, and the transmittance of ambient light is higher.

Fig. 10 is a schematic diagram of some embodiments of a head-up display of the present disclosure. As shown in fig. 10, the head-up display of the present disclosure may include an image source 81 and a display device 82, wherein:

the image source 81 is configured to emit imaging light.

A display device 82 configured to receive imaging light and form an imaging screen 83, wherein the imaging screen 83 is for viewing by a human eye of an eye-box region 84.

In some embodiments of the present disclosure, the display device 82 may be a display device as described in any of the above embodiments of the present disclosure (e.g., any of fig. 4-9).

In some embodiments of the present disclosure, the display device 82 may be a windshield as described in any of the embodiments above.

In some embodiments of the present disclosure, as shown in fig. 10, the head-up display of the present disclosure may further include a first mirror 85, a second mirror 86, a package housing 87, and a light outlet 88, wherein:

the imaging light emitted from the image source 81 is reflected by the first mirror 85 and the second mirror 86, and then emitted to the display device 82 through the light outlet 88 of the package housing 87.

The package case 87 is used to package the image source 81, the first mirror 85, and the second mirror 86.

In some embodiments of the present disclosure, as shown in fig. 10, the first mirror 85 may be a planar mirror; the second mirror 86 may be a curved mirror. It should be noted that the first mirror 85 is not necessarily configured, and may be omitted in other embodiments. The second reflecting mirror 86 is only an example, and in other examples, other structures capable of amplifying the imaging light may be employed, without limitation.

In the head-up display disclosed by the disclosure, the corresponding ghost-eliminating scheme can be set on the basis that the display device is provided with at least two layers of coating films, so that the definition of images is improved.

In the head-up display, the number of times of reflection of light can be increased on the basis that the display device is provided with at least two layers of coating films, so that the total quantity of the reflected light is increased, and the brightness of the light is increased.

According to another aspect of the present disclosure, there is provided a traffic device comprising a heads-up display as described in any of the embodiments described above (e.g., the embodiment of fig. 10).

In some embodiments of the present disclosure, the display device may be an imaging window.

In some embodiments of the present disclosure, the imaging window may be a afterloaded imaging panel or a windshield window of a traffic device, or the like.

In some embodiments of the present disclosure, the transportation device may include, but is not limited to, land vehicles such as vehicles, air vehicles such as aircraft, or water or underwater vehicles, and the like.

According to the embodiment of the disclosure, the image source emits the light rays which are projected onto the display device, so that a user can directly see the picture without lowering the head, and the user experience can be improved. According to the embodiment of the disclosure, distraction caused by low head view of a dashboard in the driving process of a driver can be avoided, so that the driving safety coefficient is improved, and better driving experience can be brought.

Thus far, the present disclosure has been described in detail. In order to avoid obscuring the concepts of the present disclosure, some details known in the art are not described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.

Those of ordinary skill in the art will appreciate that all or a portion of the steps implementing the above embodiments may be implemented by hardware, or may be implemented by a program indicating that the relevant hardware is implemented, where the program may be stored on a non-transitory computer readable storage medium, where the storage medium may be a read-only memory, a magnetic disk or optical disk, etc.

The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. An optical film, comprising:

2. An optical film according to claim 1, wherein:

the refractive index of the first refractive index layer is higher than that of the second refractive index layer, the value range of the refractive index of the first refractive index layer is 1.9-2.7, and the value range of the refractive index of the second refractive index layer is 1.3-1.9; or,

the refractive index of the first refractive index layer ranges from 2 to 2.5, and the refractive index of the second refractive index layer ranges from 1.40 to 1.49.

3. An optical film according to claim 1 or 2, wherein the light rays of the first characteristic comprise a first light component, a second light component and a third light component having different wavelength ranges.

4. An optical film according to claim 3, wherein:

the range of the wavelength of the first light component is 410nm-490nm, and/or the range of the wavelength of the second light component is 510nm-570nm, and/or the range of the wavelength of the third light component is 580nm-670nm; or,

the first light component has a wavelength ranging from 420nm to 460nm, and/or the second light component has a wavelength ranging from 520nm to 560nm, and/or the third light component has a wavelength ranging from 590nm to 630nm.

5. An optical film according to claim 1 or 2, wherein the first preset value is in the range of 7% to 35% and the second preset value is in the range of 10% to 35%.

6. An optical film as recited in claim 1, wherein the film body further comprises at least one second laminate structure comprising an infrared isolation layer and a first refractive index layer in a laminated arrangement.

7. The optical film of claim 6, wherein the optical film has a transmittance of less than or equal to 30% of incident infrared light.

8. An optical film according to claim 6 or 7, wherein the infrared isolation layer comprises a silver-containing layer, and the thickness of the infrared isolation layer has a value in the range of 20nm to 25nm.

9. An optical film as recited in claim 8, wherein:

the thickness of the first refractive index layer is 5nm-100nm, and the thickness of the second refractive index layer is 10nm-120nm; or,

the thickness of the first refractive index layer is in the range of 6nm-80nm, and the thickness of the second refractive index layer is in the range of 16nm-115nm.

10. An optical film according to claim 1 or 2, wherein the optical film has a transmittance of 70% or more for light rays not having the first characteristic, and/or a reflectance of 30% to 35% for light rays having the first characteristic whose incidence angle is in a set angle range of 35 degrees to 75 degrees.

11. An optical film as recited in claim 1 or claim 2, wherein the light of the first characteristic comprises at least three spectral bands or lines having a half-width of less than or equal to 60nm, the at least three spectral bands or lines corresponding to different wavelengths.

12. The optical film of claim 11, wherein the optical film has a reflectance of 10% to 50% of each of the at least three spectral bands or lines, or wherein the optical film has a reflectance of 25% to 35% of each of the at least three spectral bands or lines.

13. A display device, comprising:

a plurality of transparent substrates stacked;

at least one transflective film disposed in at least one of two first locations and a plurality of second locations, the first locations being a surface of the transparent substrate away from the intermediate layer and the second locations being a surface of the transparent substrate near the intermediate layer, the transflective film being the optical film of any one of claims 1-12.

14. The display device of claim 13, wherein at least one of the transparent substrates in the plurality of transparent substrates is a first transparent substrate, the at least one transflective film comprises a first film and a second film, the first film is positioned on a first surface of the first transparent substrate, the second film is positioned on a second surface of the first transparent substrate, and a thickness of the first transparent substrate is less than a predetermined thickness.

15. The display device according to claim 14, wherein the range of values of the predetermined thickness is less than or equal to 1.5mm.

16. The display device according to any one of claims 13 to 15, wherein at least one of the transparent substrate or the intermediate layer between two adjacent transflective films is a wedge-shaped structure.

17. The display device according to any one of claims 13 to 15, further comprising:

18. The display device according to claim 17, wherein: the light rays of the first characteristic comprise a first light component, a second light component and a third light component of different wavelengths,

19. The display device according to claim 18, wherein: the range of the wavelength of the first light component is 420nm-460nm.

20. The display device according to any one of claims 13 to 15, wherein the plurality of transparent substrates is two transparent substrates, the two transparent substrates comprising: the first transparent substrate and the second transparent substrate, the plurality of second positions are two second positions, the first position comprises a surface of the first transparent substrate far away from the middle layer and a surface of the second transparent substrate far away from the middle layer, and the second position comprises a surface of the first transparent substrate close to the middle layer and a surface of the second transparent substrate close to the middle layer.

21. The display device according to claim 20, wherein the transflective film comprises two transflective films disposed at any two positions of the two first positions and the two second positions, respectively, or wherein the transflective film comprises three transflective films disposed at any three positions of the two first positions and the two second positions, respectively, or wherein the transflective film comprises four transflective films disposed at the two first positions and the two second positions, respectively.

22. A windshield, comprising:

a plurality of transparent substrates stacked;

at least one transflective film disposed in at least one of two first locations, the surface of the transparent substrate distal from the intermediate layer, and a plurality of second locations, the surface of the transparent substrate proximal to the intermediate layer, the transflective film being the optical film of any one of claims 1-12.

23. A head-up display comprising an image source and a windscreen as claimed in claim 22 or comprising a display device as claimed in any of claims 13 to 21.

24. A traffic device comprising the heads-up display of claim 23.